* [PATCH v2 0/4] mxs-lradc: Split driver into MFD
@ 2016-06-08 14:43 Ksenija Stanojevic
2016-06-08 14:45 ` [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
` (3 more replies)
0 siblings, 4 replies; 11+ messages in thread
From: Ksenija Stanojevic @ 2016-06-08 14:43 UTC (permalink / raw)
To: linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, marex, linux-iio, harald, stefan.wahren, fabio.estevam,
Ksenija Stanojevic
Split existing driver mxs-lradc into MFD with touchscreen and
IIO part.
Tested on i.MX28.
Ksenija Stanojevic (4):
mfd: mxs-lradc: Add support for mxs-lradc MFD
iio: adc: mxs-lradc: Add support for adc driver
input: touchscreen: mxs-lradc: Add support for touchscreen
iio: adc: mxs-lradc: Remove driver
drivers/iio/adc/Kconfig | 27 +-
drivers/iio/adc/Makefile | 2 +-
drivers/iio/adc/mxs-lradc-adc.c | 813 ++++++++++++++
drivers/iio/adc/mxs-lradc.c | 1775 ------------------------------
drivers/input/touchscreen/Kconfig | 10 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/mxs-lradc-ts.c | 726 ++++++++++++
drivers/mfd/Kconfig | 17 +
drivers/mfd/Makefile | 1 +
drivers/mfd/mxs-lradc.c | 215 ++++
include/linux/mfd/mxs-lradc.h | 204 ++++
11 files changed, 2001 insertions(+), 1790 deletions(-)
create mode 100644 drivers/iio/adc/mxs-lradc-adc.c
delete mode 100644 drivers/iio/adc/mxs-lradc.c
create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
create mode 100644 drivers/mfd/mxs-lradc.c
create mode 100644 include/linux/mfd/mxs-lradc.h
--
1.9.1
^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD
2016-06-08 14:43 [PATCH v2 0/4] mxs-lradc: Split driver into MFD Ksenija Stanojevic
@ 2016-06-08 14:45 ` Ksenija Stanojevic
2016-06-11 15:32 ` Jonathan Cameron
2016-06-15 21:17 ` Stefan Wahren
2016-06-08 14:47 ` [PATCH v2 2/4] iio: adc: mxs-lradc: Add support for adc driver Ksenija Stanojevic
` (2 subsequent siblings)
3 siblings, 2 replies; 11+ messages in thread
From: Ksenija Stanojevic @ 2016-06-08 14:45 UTC (permalink / raw)
To: linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, marex, linux-iio, harald, stefan.wahren, fabio.estevam,
Ksenija Stanojevic
Add core files for mxs-lradc MFD driver.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
Changes in v2:
- do not change spacing in Kconfig
- make struct mfd_cell part of struct mxs_lradc
- use switch instead of if in mxs_lradc_irq_mask
- use only necessary header files in mxs_lradc.h
- use devm_mfd_add_device
- use separate function to register mfd device
- change licence to GPL
- add copyright
drivers/mfd/Kconfig | 17 ++++
drivers/mfd/Makefile | 1 +
drivers/mfd/mxs-lradc.c | 215 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/mxs-lradc.h | 204 +++++++++++++++++++++++++++++++++++++++
4 files changed, 437 insertions(+)
create mode 100644 drivers/mfd/mxs-lradc.c
create mode 100644 include/linux/mfd/mxs-lradc.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9ca66de..62593ad 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -271,6 +271,23 @@ config MFD_MC13XXX_I2C
help
Select this if your MC13xxx is connected via an I2C bus.
+config MFD_MXS_LRADC
+ tristate "Freescale i.MX23/i.MX28 LRADC"
+ depends on ARCH_MXS || COMPILE_TEST
+ select MFD_CORE
+ select STMP_DEVICE
+ help
+ Say yes here to build support for the low-resolution
+ analog-to-digital converter (LRADC) found on the i.MX23 and i.MX28
+ processors. This driver provides common support for accessing the
+ device, additional drivers must be enabled in order to use the
+ functionality of the device:
+ mxs-lradc-adc for ADC readings
+ mxs-lradc-ts for touchscreen support
+
+ This driver can also be built as a module. If so, the module will be
+ called mxs-lradc.
+
config MFD_HI6421_PMIC
tristate "HiSilicon Hi6421 PMU/Codec IC"
depends on OF
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0f230a6..ecf6399 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -198,3 +198,4 @@ intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC) += intel_soc_pmic_bxtwc.o
obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
+obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
diff --git a/drivers/mfd/mxs-lradc.c b/drivers/mfd/mxs-lradc.c
new file mode 100644
index 0000000..5e894bb
--- /dev/null
+++ b/drivers/mfd/mxs-lradc.c
@@ -0,0 +1,215 @@
+/*
+ * Freescale MXS LRADC driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Marek Vasut <marex@denx.de>
+ * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mxs-lradc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+static const char * const mx23_lradc_irq_names[] = {
+ "mxs-lradc-touchscreen",
+ "mxs-lradc-channel0",
+ "mxs-lradc-channel1",
+ "mxs-lradc-channel2",
+ "mxs-lradc-channel3",
+ "mxs-lradc-channel4",
+ "mxs-lradc-channel5",
+ "mxs-lradc-channel6",
+ "mxs-lradc-channel7",
+};
+
+static const char * const mx28_lradc_irq_names[] = {
+ "mxs-lradc-touchscreen",
+ "mxs-lradc-thresh0",
+ "mxs-lradc-thresh1",
+ "mxs-lradc-channel0",
+ "mxs-lradc-channel1",
+ "mxs-lradc-channel2",
+ "mxs-lradc-channel3",
+ "mxs-lradc-channel4",
+ "mxs-lradc-channel5",
+ "mxs-lradc-channel6",
+ "mxs-lradc-channel7",
+ "mxs-lradc-button0",
+ "mxs-lradc-button1",
+};
+
+struct mxs_lradc_of_config {
+ const int irq_count;
+ const char * const *irq_name;
+};
+
+static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
+ [IMX23_LRADC] = {
+ .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
+ .irq_name = mx23_lradc_irq_names,
+ },
+ [IMX28_LRADC] = {
+ .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
+ .irq_name = mx28_lradc_irq_names,
+ },
+};
+
+static const struct of_device_id mxs_lradc_dt_ids[] = {
+ { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
+ { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
+
+static int mxs_lradc_add_device(struct platform_device *pdev,
+ struct mxs_lradc *lradc, char *name, int i)
+{
+ struct mfd_cell *cell;
+
+ cell = &lradc->cells[i];
+ cell->name = name;
+ cell->platform_data = lradc;
+ cell->pdata_size = sizeof(*lradc);
+
+ return devm_mfd_add_devices(&pdev->dev, -1, cell, 1, NULL, 0, NULL);
+}
+
+static int mxs_lradc_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id =
+ of_match_device(mxs_lradc_dt_ids, &pdev->dev);
+ const struct mxs_lradc_of_config *of_cfg =
+ &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct mxs_lradc *lradc;
+ struct resource *iores;
+ int ret = 0, touch_ret, i;
+ u32 ts_wires = 0;
+
+ lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
+ if (!lradc)
+ return -ENOMEM;
+ lradc->soc = (enum mxs_lradc_id)of_id->data;
+
+ /* Grab the memory area */
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ lradc->base = devm_ioremap_resource(dev, iores);
+ if (IS_ERR(lradc->base))
+ return PTR_ERR(lradc->base);
+
+ lradc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(lradc->clk)) {
+ dev_err(dev, "Failed to get the delay unit clock\n");
+ return PTR_ERR(lradc->clk);
+ }
+ ret = clk_prepare_enable(lradc->clk);
+ if (ret != 0) {
+ dev_err(dev, "Failed to enable the delay unit clock\n");
+ return ret;
+ }
+
+ touch_ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+
+ if (touch_ret == 0)
+ lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
+ else
+ lradc->buffer_vchans = BUFFER_VCHANS_ALL;
+
+ lradc->irq_count = of_cfg->irq_count;
+ lradc->irq_name = of_cfg->irq_name;
+ for (i = 0; i < lradc->irq_count; i++) {
+ lradc->irq[i] = platform_get_irq(pdev, i);
+ if (lradc->irq[i] < 0) {
+ ret = lradc->irq[i];
+ goto err_clk;
+ }
+ }
+
+ platform_set_drvdata(pdev, lradc);
+
+ ret = stmp_reset_block(lradc->base);
+ if (ret)
+ return ret;
+
+ switch (ts_wires) {
+ case 4:
+ lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
+ break;
+ case 5:
+ if (lradc->soc == IMX28_LRADC) {
+ lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
+ break;
+ }
+ /* fall through an error message for i.MX23 */
+ default:
+ dev_err(&pdev->dev,
+ "Unsupported number of touchscreen wires (%d)\n",
+ ts_wires);
+ return -EINVAL;
+ }
+
+ ret = mxs_lradc_add_device(pdev, lradc, DRIVER_NAME_ADC, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
+ goto err_clk;
+ }
+
+ if (!lradc->use_touchscreen)
+ return 0;
+
+ ret = mxs_lradc_add_device(pdev, lradc, DRIVER_NAME_TS, 1);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to add the touchscreen subdevice\n");
+ goto err_clk;
+ }
+
+ return 0;
+
+err_clk:
+ clk_disable_unprepare(lradc->clk);
+
+ return ret;
+}
+
+static int mxs_lradc_remove(struct platform_device *pdev)
+{
+ struct mxs_lradc *lradc = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(lradc->clk);
+
+ return 0;
+}
+
+static struct platform_driver mxs_lradc_driver = {
+ .driver = {
+ .name = "mxs-lradc",
+ .of_match_table = mxs_lradc_dt_ids,
+ },
+ .probe = mxs_lradc_probe,
+ .remove = mxs_lradc_remove,
+};
+
+module_platform_driver(mxs_lradc_driver);
+
+MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-lradc");
diff --git a/include/linux/mfd/mxs-lradc.h b/include/linux/mfd/mxs-lradc.h
new file mode 100644
index 0000000..c1475c0
--- /dev/null
+++ b/include/linux/mfd/mxs-lradc.h
@@ -0,0 +1,204 @@
+/*
+ * Freescale MXS LRADC driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Marek Vasut <marex@denx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __MXS_LRADC_H
+#define __MXS_LRADC_H
+
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/stmp_device.h>
+
+#define DRIVER_NAME_ADC "mxs-lradc-adc"
+#define DRIVER_NAME_TS "mxs-lradc-ts"
+
+#define LRADC_MAX_DELAY_CHANS 4
+#define LRADC_MAX_MAPPED_CHANS 8
+#define LRADC_MAX_TOTAL_CHANS 16
+
+#define LRADC_DELAY_TIMER_HZ 2000
+
+#define LRADC_CTRL0 0x00
+# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
+# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
+# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
+# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
+# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
+# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
+# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
+# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
+
+# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
+# define LRADC_CTRL0_MX23_YM BIT(19)
+# define LRADC_CTRL0_MX23_XM BIT(18)
+# define LRADC_CTRL0_MX23_YP BIT(17)
+# define LRADC_CTRL0_MX23_XP BIT(16)
+
+# define LRADC_CTRL0_MX28_PLATE_MASK \
+ (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
+ LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
+ LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
+ LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
+
+# define LRADC_CTRL0_MX23_PLATE_MASK \
+ (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
+ LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
+ LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
+
+#define LRADC_CTRL1 0x10
+#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
+#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
+#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
+#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
+#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
+#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
+#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
+#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
+#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
+#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
+
+#define LRADC_CTRL2 0x20
+#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
+#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
+
+#define LRADC_STATUS 0x40
+#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
+
+#define LRADC_CH(n) (0x50 + (0x10 * (n)))
+#define LRADC_CH_ACCUMULATE BIT(29)
+#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
+#define LRADC_CH_NUM_SAMPLES_OFFSET 24
+#define LRADC_CH_NUM_SAMPLES(x) \
+ ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
+#define LRADC_CH_VALUE_MASK 0x3ffff
+#define LRADC_CH_VALUE_OFFSET 0
+
+#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
+#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
+#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
+#define LRADC_DELAY_TRIGGER(x) \
+ (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
+ LRADC_DELAY_TRIGGER_LRADCS_MASK)
+#define LRADC_DELAY_KICK BIT(20)
+#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
+#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
+#define LRADC_DELAY_TRIGGER_DELAYS(x) \
+ (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
+ LRADC_DELAY_TRIGGER_DELAYS_MASK)
+#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
+#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
+#define LRADC_DELAY_LOOP(x) \
+ (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
+ LRADC_DELAY_LOOP_COUNT_MASK)
+#define LRADC_DELAY_DELAY_MASK 0x7ff
+#define LRADC_DELAY_DELAY_OFFSET 0
+#define LRADC_DELAY_DELAY(x) \
+ (((x) << LRADC_DELAY_DELAY_OFFSET) & \
+ LRADC_DELAY_DELAY_MASK)
+
+#define LRADC_CTRL4 0x140
+#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
+#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
+#define LRADC_CTRL4_LRADCSELECT(n, x) \
+ (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
+ LRADC_CTRL4_LRADCSELECT_MASK(n))
+
+#define LRADC_RESOLUTION 12
+#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
+
+enum mxs_lradc_id {
+ IMX23_LRADC,
+ IMX28_LRADC,
+};
+
+enum mxs_lradc_ts_wires {
+ MXS_LRADC_TOUCHSCREEN_NONE = 0,
+ MXS_LRADC_TOUCHSCREEN_4WIRE,
+ MXS_LRADC_TOUCHSCREEN_5WIRE,
+};
+
+struct mxs_lradc {
+ enum mxs_lradc_id soc;
+
+ void __iomem *base;
+ struct clk *clk;
+
+ int irq[13];
+ const char * const *irq_name;
+ int irq_count;
+
+#define BUFFER_VCHANS_LIMITED 0x3f
+#define BUFFER_VCHANS_ALL 0xff
+ u8 buffer_vchans;
+
+ /*
+ * Certain LRADC channels are shared between touchscreen
+ * and/or touch-buttons and generic LRADC block. Therefore when using
+ * either of these, these channels are not available for the regular
+ * sampling. The shared channels are as follows:
+ *
+ * CH0 -- Touch button #0
+ * CH1 -- Touch button #1
+ * CH2 -- Touch screen XPUL
+ * CH3 -- Touch screen YPLL
+ * CH4 -- Touch screen XNUL
+ * CH5 -- Touch screen YNLR
+ * CH6 -- Touch screen WIPER (5-wire only)
+ *
+ * The bit fields below represents which parts of the LRADC block are
+ * switched into special mode of operation. These channels can not
+ * be sampled as regular LRADC channels. The driver will refuse any
+ * attempt to sample these channels.
+ */
+#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
+#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
+#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
+ enum mxs_lradc_ts_wires use_touchscreen;
+ bool use_touchbutton;
+
+#define MXS_LRADC_CELLS 2
+ struct mfd_cell cells[MXS_LRADC_CELLS];
+};
+
+static inline void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
+{
+ writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
+}
+
+static inline void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val,
+ u32 reg)
+{
+ writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
+}
+
+static inline void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
+{
+ writel(val, lradc->base + reg);
+}
+
+static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
+{
+ switch (lradc->soc) {
+ case IMX23_LRADC:
+ return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
+ case IMX28_LRADC:
+ return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
+ default:
+ return 0;
+ }
+}
+
+#endif /* __MXS_LRADC_H */
--
1.9.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v2 2/4] iio: adc: mxs-lradc: Add support for adc driver
2016-06-08 14:43 [PATCH v2 0/4] mxs-lradc: Split driver into MFD Ksenija Stanojevic
2016-06-08 14:45 ` [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
@ 2016-06-08 14:47 ` Ksenija Stanojevic
2016-06-11 15:48 ` Jonathan Cameron
2016-06-08 14:48 ` [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
2016-06-08 14:49 ` [PATCH v2 4/4] iio: adc: mxs-lradc: Remove driver Ksenija Stanojevic
3 siblings, 1 reply; 11+ messages in thread
From: Ksenija Stanojevic @ 2016-06-08 14:47 UTC (permalink / raw)
To: linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, marex, linux-iio, harald, stefan.wahren, fabio.estevam,
Ksenija Stanojevic
Add support for sixteen-channel 12-bit resolution ADC and its functions,
which include general-purpose ADC readings, battery voltage measurement,
and die temperature measurement.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
Changes in v2:
- improve commit message
- do not change spacing in Kconfig
- impove formating
- remove wrapper show_scale_avail
- use correct syntax for comments
- use devm_iio_trigger_alloc
- do not allocate buffer dynamically
- use iio_device_claim_*_mode helpers
- add spinlock in struct mxs_lradc_ts to enable locking in interrupt handler
- only grab irqs that are relevant to adc
- remove blank line at the end of the file
- change licence to GPL
- add copyright
drivers/iio/adc/Kconfig | 13 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/mxs-lradc-adc.c | 813 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 827 insertions(+)
create mode 100644 drivers/iio/adc/mxs-lradc-adc.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 932de1f..4ef3ad1 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -194,6 +194,19 @@ config EXYNOS_ADC
To compile this driver as a module, choose M here: the module will be
called exynos_adc.
+config MXS_LRADC_ADC
+ tristate "Freescale i.MX23/i.MX28 LRADC ADC"
+ depends on MFD_MXS_LRADC
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say yes here to build support for the ADC functions of the
+ i.MX23/i.MX28 LRADC. This includes general-purpose ADC readings,
+ battery voltage measurement, and die temperature measurement.
+
+ This driver can also be built as a module. If so, the module will be
+ called mxs-lradc-adc.
+
config HI8435
tristate "Holt Integrated Circuits HI-8435 threshold detector"
select IIO_TRIGGERED_EVENT
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index b1aa456..9bb35c4 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_MAX1363) += max1363.o
obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_MCP3422) += mcp3422.o
obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
+obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
obj-$(CONFIG_NAU7802) += nau7802.o
obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
diff --git a/drivers/iio/adc/mxs-lradc-adc.c b/drivers/iio/adc/mxs-lradc-adc.c
new file mode 100644
index 0000000..3b00bc0
--- /dev/null
+++ b/drivers/iio/adc/mxs-lradc-adc.c
@@ -0,0 +1,813 @@
+/*
+ * Freescale MXS LRADC ADC driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Marek Vasut <marex@denx.de>
+ * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mxs-lradc.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sysfs.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/sysfs.h>
+
+/*
+ * Make this runtime configurable if necessary. Currently, if the buffered mode
+ * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
+ * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
+ * seconds. The result is that the samples arrive every 500mS.
+ */
+#define LRADC_DELAY_TIMER_PER 200
+#define LRADC_DELAY_TIMER_LOOP 5
+
+#define VREF_MV_BASE 1850
+
+#define IMX23_NUM_IRQ 6
+#define IMX28_NUM_IRQ 10
+
+static const int mx23_lradc_adc_irq[] = {1, 2, 3, 4, 5, 6};
+static const int mx28_lradc_adc_irq[] = {1, 2, 3, 4, 5, 6, 7, 8, 11, 12};
+
+static const u32 mxs_lradc_adc_vref_mv[][LRADC_MAX_TOTAL_CHANS] = {
+ [IMX23_LRADC] = {
+ VREF_MV_BASE, /* CH0 */
+ VREF_MV_BASE, /* CH1 */
+ VREF_MV_BASE, /* CH2 */
+ VREF_MV_BASE, /* CH3 */
+ VREF_MV_BASE, /* CH4 */
+ VREF_MV_BASE, /* CH5 */
+ VREF_MV_BASE * 2, /* CH6 VDDIO */
+ VREF_MV_BASE * 4, /* CH7 VBATT */
+ VREF_MV_BASE, /* CH8 Temp sense 0 */
+ VREF_MV_BASE, /* CH9 Temp sense 1 */
+ VREF_MV_BASE, /* CH10 */
+ VREF_MV_BASE, /* CH11 */
+ VREF_MV_BASE, /* CH12 USB_DP */
+ VREF_MV_BASE, /* CH13 USB_DN */
+ VREF_MV_BASE, /* CH14 VBG */
+ VREF_MV_BASE * 4, /* CH15 VDD5V */
+ },
+ [IMX28_LRADC] = {
+ VREF_MV_BASE, /* CH0 */
+ VREF_MV_BASE, /* CH1 */
+ VREF_MV_BASE, /* CH2 */
+ VREF_MV_BASE, /* CH3 */
+ VREF_MV_BASE, /* CH4 */
+ VREF_MV_BASE, /* CH5 */
+ VREF_MV_BASE, /* CH6 */
+ VREF_MV_BASE * 4, /* CH7 VBATT */
+ VREF_MV_BASE, /* CH8 Temp sense 0 */
+ VREF_MV_BASE, /* CH9 Temp sense 1 */
+ VREF_MV_BASE * 2, /* CH10 VDDIO */
+ VREF_MV_BASE, /* CH11 VTH */
+ VREF_MV_BASE * 2, /* CH12 VDDA */
+ VREF_MV_BASE, /* CH13 VDDD */
+ VREF_MV_BASE, /* CH14 VBG */
+ VREF_MV_BASE * 4, /* CH15 VDD5V */
+ },
+};
+
+enum mxs_lradc_divbytwo {
+ MXS_LRADC_DIV_DISABLED = 0,
+ MXS_LRADC_DIV_ENABLED,
+};
+
+struct mxs_lradc_scale {
+ unsigned int integer;
+ unsigned int nano;
+};
+
+struct mxs_lradc_adc {
+ struct mxs_lradc *lradc;
+ struct device *dev;
+
+ u32 buffer[8];
+ struct iio_trigger *trig;
+ struct completion completion;
+ spinlock_t lock;
+
+ const u32 *vref_mv;
+ struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
+ unsigned long is_divided;
+};
+
+
+/* Raw I/O operations */
+static int mxs_lradc_adc_read_single(struct iio_dev *iio_dev, int chan,
+ int *val)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio_dev);
+ struct mxs_lradc *lradc = adc->lradc;
+ int ret;
+
+ /*
+ * See if there is no buffered operation in progress. If there is simply
+ * bail out. This can be improved to support both buffered and raw IO at
+ * the same time, yet the code becomes horribly complicated. Therefore I
+ * applied KISS principle here.
+ */
+ ret = iio_device_claim_direct_mode(iio_dev);
+ if (ret)
+ return ret;
+
+ reinit_completion(&adc->completion);
+
+ /*
+ * No buffered operation in progress, map the channel and trigger it.
+ * Virtual channel 0 is always used here as the others are always not
+ * used if doing raw sampling.
+ */
+ if (lradc->soc == IMX28_LRADC)
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
+ LRADC_CTRL1);
+ mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
+
+ /* Enable / disable the divider per requirement */
+ if (test_bit(chan, &adc->is_divided))
+ mxs_lradc_reg_set(lradc,
+ 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ LRADC_CTRL2);
+ else
+ mxs_lradc_reg_clear(lradc,
+ 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ LRADC_CTRL2);
+
+ /* Clean the slot's previous content, then set new one. */
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
+ LRADC_CTRL4);
+ mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
+
+ mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
+
+ /* Enable the IRQ and start sampling the channel. */
+ mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
+ mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
+
+ /* Wait for completion on the channel, 1 second max. */
+ ret = wait_for_completion_killable_timeout(&adc->completion, HZ);
+ if (!ret)
+ ret = -ETIMEDOUT;
+ if (ret < 0)
+ goto err;
+
+ /* Read the data. */
+ *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
+ ret = IIO_VAL_INT;
+
+err:
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
+
+ iio_device_release_direct_mode(iio_dev);
+
+ return ret;
+}
+
+static int mxs_lradc_adc_read_temp(struct iio_dev *iio_dev, int *val)
+{
+ int ret, min, max;
+
+ ret = mxs_lradc_adc_read_single(iio_dev, 8, &min);
+ if (ret != IIO_VAL_INT)
+ return ret;
+
+ ret = mxs_lradc_adc_read_single(iio_dev, 9, &max);
+ if (ret != IIO_VAL_INT)
+ return ret;
+
+ *val = max - min;
+
+ return IIO_VAL_INT;
+}
+
+static int mxs_lradc_adc_read_raw(struct iio_dev *iio_dev,
+ const struct iio_chan_spec *chan,
+ int *val, int *val2, long m)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio_dev);
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ if (chan->type == IIO_TEMP)
+ return mxs_lradc_adc_read_temp(iio_dev, val);
+
+ return mxs_lradc_adc_read_single(iio_dev, chan->channel, val);
+
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_TEMP) {
+ /*
+ * From the datasheet, we have to multiply by 1.012 and
+ * divide by 4
+ */
+ *val = 0;
+ *val2 = 253000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+
+ *val = adc->vref_mv[chan->channel];
+ *val2 = chan->scan_type.realbits -
+ test_bit(chan->channel, &adc->is_divided);
+ return IIO_VAL_FRACTIONAL_LOG2;
+
+ case IIO_CHAN_INFO_OFFSET:
+ if (chan->type == IIO_TEMP) {
+ /*
+ * The calculated value from the ADC is in Kelvin, we
+ * want Celsius for hwmon so the offset is -273.15
+ * The offset is applied before scaling so it is
+ * actually -213.15 * 4 / 1.012 = -1079.644268
+ */
+ *val = -1079;
+ *val2 = 644268;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+
+ return -EINVAL;
+
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static int mxs_lradc_adc_write_raw(struct iio_dev *iio_dev,
+ const struct iio_chan_spec *chan,
+ int val, int val2, long m)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio_dev);
+ struct mxs_lradc_scale *scale_avail =
+ adc->scale_avail[chan->channel];
+ int ret;
+
+ ret = iio_device_claim_direct_mode(iio_dev);
+ if (ret)
+ return ret;
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ ret = -EINVAL;
+ if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
+ val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
+ /* divider by two disabled */
+ clear_bit(chan->channel, &adc->is_divided);
+ ret = 0;
+ } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
+ val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
+ /* divider by two enabled */
+ set_bit(chan->channel, &adc->is_divided);
+ ret = 0;
+ }
+
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ iio_device_release_direct_mode(iio_dev);
+
+ return ret;
+}
+
+static int mxs_lradc_adc_write_raw_get_fmt(struct iio_dev *iio_dev,
+ const struct iio_chan_spec *chan,
+ long m)
+{
+ return IIO_VAL_INT_PLUS_NANO;
+}
+
+static ssize_t mxs_lradc_adc_show_scale_avail(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *iio = dev_to_iio_dev(dev);
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
+ int i, ch, len = 0;
+
+ ch = iio_attr->address;
+ for (i = 0; i < ARRAY_SIZE(adc->scale_avail[ch]); i++)
+ len += sprintf(buf + len, "%u.%09u ",
+ adc->scale_avail[ch][i].integer,
+ adc->scale_avail[ch][i].nano);
+
+ len += sprintf(buf + len, "\n");
+
+ return len;
+}
+
+#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
+static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
+ mxs_lradc_adc_show_scale_avail, NULL, ch)
+
+SHOW_SCALE_AVAILABLE_ATTR(0);
+SHOW_SCALE_AVAILABLE_ATTR(1);
+SHOW_SCALE_AVAILABLE_ATTR(2);
+SHOW_SCALE_AVAILABLE_ATTR(3);
+SHOW_SCALE_AVAILABLE_ATTR(4);
+SHOW_SCALE_AVAILABLE_ATTR(5);
+SHOW_SCALE_AVAILABLE_ATTR(6);
+SHOW_SCALE_AVAILABLE_ATTR(7);
+SHOW_SCALE_AVAILABLE_ATTR(10);
+SHOW_SCALE_AVAILABLE_ATTR(11);
+SHOW_SCALE_AVAILABLE_ATTR(12);
+SHOW_SCALE_AVAILABLE_ATTR(13);
+SHOW_SCALE_AVAILABLE_ATTR(14);
+SHOW_SCALE_AVAILABLE_ATTR(15);
+
+static struct attribute *mxs_lradc_adc_attributes[] = {
+ &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
+ &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group mxs_lradc_adc_attribute_group = {
+ .attrs = mxs_lradc_adc_attributes,
+};
+
+static const struct iio_info mxs_lradc_adc_iio_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = mxs_lradc_adc_read_raw,
+ .write_raw = mxs_lradc_adc_write_raw,
+ .write_raw_get_fmt = mxs_lradc_adc_write_raw_get_fmt,
+ .attrs = &mxs_lradc_adc_attribute_group,
+};
+
+
+/* IRQ Handling */
+static irqreturn_t mxs_lradc_adc_handle_irq(int irq, void *data)
+{
+ struct iio_dev *iio = data;
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ struct mxs_lradc *lradc = adc->lradc;
+ unsigned long reg = readl(lradc->base + LRADC_CTRL1);
+ unsigned long flags;
+
+ if (!(reg & mxs_lradc_irq_mask(lradc)))
+ return IRQ_NONE;
+
+ if (iio_buffer_enabled(iio)) {
+ if (reg & lradc->buffer_vchans) {
+ spin_lock_irqsave(&adc->lock, flags);
+ iio_trigger_poll(iio->trig);
+ spin_unlock_irqrestore(&adc->lock, flags);
+ }
+ } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
+ complete(&adc->completion);
+ }
+
+ mxs_lradc_reg_clear(lradc, reg & mxs_lradc_irq_mask(lradc),
+ LRADC_CTRL1);
+
+ return IRQ_HANDLED;
+}
+
+
+/* Trigger handling */
+static irqreturn_t mxs_lradc_adc_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *iio = pf->indio_dev;
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ const u32 chan_value = LRADC_CH_ACCUMULATE |
+ ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
+ unsigned int i, j = 0;
+
+ for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
+ adc->buffer[j] = readl(adc->lradc->base + LRADC_CH(j));
+ mxs_lradc_reg_wrt(adc->lradc, chan_value, LRADC_CH(j));
+ adc->buffer[j] &= LRADC_CH_VALUE_MASK;
+ adc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
+ j++;
+ }
+
+ iio_push_to_buffers_with_timestamp(iio, adc->buffer, pf->timestamp);
+
+ iio_trigger_notify_done(iio->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int mxs_lradc_adc_configure_trigger(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *iio = iio_trigger_get_drvdata(trig);
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
+
+ mxs_lradc_reg_wrt(adc->lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
+
+ return 0;
+}
+
+static const struct iio_trigger_ops mxs_lradc_adc_trigger_ops = {
+ .owner = THIS_MODULE,
+ .set_trigger_state = &mxs_lradc_adc_configure_trigger,
+};
+
+static int mxs_lradc_adc_trigger_init(struct iio_dev *iio)
+{
+ int ret;
+ struct iio_trigger *trig;
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+
+ trig = devm_iio_trigger_alloc(&iio->dev, "%s-dev%i", iio->name,
+ iio->id);
+
+ trig->dev.parent = adc->dev;
+ iio_trigger_set_drvdata(trig, iio);
+ trig->ops = &mxs_lradc_adc_trigger_ops;
+
+ ret = iio_trigger_register(trig);
+ if (ret)
+ return ret;
+
+ adc->trig = trig;
+
+ return 0;
+}
+
+static void mxs_lradc_adc_trigger_remove(struct iio_dev *iio)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+
+ iio_trigger_unregister(adc->trig);
+}
+
+static int mxs_lradc_adc_buffer_preenable(struct iio_dev *iio)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ struct mxs_lradc *lradc = adc->lradc;
+ int chan, ofs = 0;
+ unsigned long enable = 0;
+ u32 ctrl4_set = 0;
+ u32 ctrl4_clr = 0;
+ u32 ctrl1_irq = 0;
+ const u32 chan_value = LRADC_CH_ACCUMULATE |
+ ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
+
+ if (lradc->soc == IMX28_LRADC)
+ mxs_lradc_reg_clear(lradc,
+ lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ LRADC_CTRL1);
+ mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
+
+ for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
+ ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
+ ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
+ ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
+ mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
+ bitmap_set(&enable, ofs, 1);
+ ofs++;
+ }
+
+ mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
+ LRADC_DELAY_KICK, LRADC_DELAY(0));
+ mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
+ mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
+ mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
+ mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
+ LRADC_DELAY(0));
+
+ return 0;
+}
+
+static int mxs_lradc_adc_buffer_postdisable(struct iio_dev *iio)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ struct mxs_lradc *lradc = adc->lradc;
+
+ mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
+ LRADC_DELAY_KICK, LRADC_DELAY(0));
+
+ mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
+ if (lradc->soc == IMX28_LRADC)
+ mxs_lradc_reg_clear(lradc,
+ lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ LRADC_CTRL1);
+
+ return 0;
+}
+
+static bool mxs_lradc_adc_validate_scan_mask(struct iio_dev *iio,
+ const unsigned long *mask)
+{
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+ struct mxs_lradc *lradc = adc->lradc;
+ const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
+ int rsvd_chans = 0;
+ unsigned long rsvd_mask = 0;
+
+ if (lradc->use_touchbutton)
+ rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
+ if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
+ rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
+ if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
+ rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
+
+ if (lradc->use_touchbutton)
+ rsvd_chans++;
+ if (lradc->use_touchscreen)
+ rsvd_chans += 2;
+
+ /* Test for attempts to map channels with special mode of operation. */
+ if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
+ return false;
+
+ /* Test for attempts to map more channels then available slots. */
+ if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
+ return false;
+
+ return true;
+}
+
+static const struct iio_buffer_setup_ops mxs_lradc_adc_buffer_ops = {
+ .preenable = &mxs_lradc_adc_buffer_preenable,
+ .postenable = &iio_triggered_buffer_postenable,
+ .predisable = &iio_triggered_buffer_predisable,
+ .postdisable = &mxs_lradc_adc_buffer_postdisable,
+ .validate_scan_mask = &mxs_lradc_adc_validate_scan_mask,
+};
+
+/* Driver initialization */
+#define MXS_ADC_CHAN(idx, chan_type, name) { \
+ .type = (chan_type), \
+ .indexed = 1, \
+ .scan_index = (idx), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE), \
+ .channel = (idx), \
+ .address = (idx), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = LRADC_RESOLUTION, \
+ .storagebits = 32, \
+ }, \
+ .datasheet_name = (name), \
+}
+
+static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
+ MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
+ MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
+ MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
+ MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
+ MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
+ MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
+ MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
+ MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
+ /* Combined Temperature sensors */
+ {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .scan_index = 8,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .channel = 8,
+ .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
+ .datasheet_name = "TEMP_DIE",
+ },
+ /* Hidden channel to keep indexes */
+ {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .scan_index = -1,
+ .channel = 9,
+ },
+ MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
+ MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
+ MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
+ MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
+ MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
+ MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
+};
+
+static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
+ MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
+ MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
+ MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
+ MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
+ MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
+ MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
+ MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
+ MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
+ /* Combined Temperature sensors */
+ {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .scan_index = 8,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .channel = 8,
+ .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
+ .datasheet_name = "TEMP_DIE",
+ },
+ /* Hidden channel to keep indexes */
+ {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .scan_index = -1,
+ .channel = 9,
+ },
+ MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
+ MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
+ MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
+ MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
+ MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
+ MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
+};
+
+static void mxs_lradc_adc_hw_init(struct mxs_lradc_adc *adc)
+{
+ struct mxs_lradc *lradc = adc->lradc;
+
+ /* The ADC always uses DELAY CHANNEL 0. */
+ const u32 adc_cfg =
+ (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
+ (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
+
+ /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
+ mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
+
+ /*
+ * Start internal temperature sensing by clearing bit
+ * HW_LRADC_CTRL2_TEMPSENSE_PWD. This bit can be left cleared
+ * after power up.
+ */
+ mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
+}
+
+static void mxs_lradc_adc_hw_stop(struct mxs_lradc_adc *adc)
+{
+ mxs_lradc_reg_wrt(adc->lradc, 0, LRADC_DELAY(0));
+}
+
+static int mxs_lradc_adc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mxs_lradc *lradc = dev_get_platdata(dev);
+ struct mxs_lradc_adc *adc;
+ struct iio_dev *iio;
+ int ret, i, j, s, n;
+ u64 scale_uv;
+ const int *irq;
+
+
+ /* Allocate the IIO device. */
+ iio = devm_iio_device_alloc(dev, sizeof(*adc));
+ if (!iio) {
+ dev_err(dev, "Failed to allocate IIO device\n");
+ return -ENOMEM;
+ }
+
+ adc = iio_priv(iio);
+ adc->lradc = lradc;
+ adc->dev = dev;
+
+ init_completion(&adc->completion);
+ spin_lock_init(&adc->lock);
+
+ platform_set_drvdata(pdev, iio);
+
+ iio->name = pdev->name;
+ iio->dev.parent = dev;
+ iio->dev.of_node = dev->parent->of_node;
+ iio->info = &mxs_lradc_adc_iio_info;
+ iio->modes = INDIO_DIRECT_MODE;
+ iio->masklength = LRADC_MAX_TOTAL_CHANS;
+
+ if (lradc->soc == IMX23_LRADC) {
+ iio->channels = mx23_lradc_chan_spec;
+ iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
+ irq = mx23_lradc_adc_irq;
+ n = IMX23_NUM_IRQ;
+ } else {
+ iio->channels = mx28_lradc_chan_spec;
+ iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
+ irq = mx28_lradc_adc_irq;
+ n = IMX28_NUM_IRQ;
+ }
+
+ for (i = 0; i < n; i++) {
+ j = irq[i];
+ ret = devm_request_irq(dev, lradc->irq[j],
+ mxs_lradc_adc_handle_irq,
+ 0, lradc->irq_name[j], iio);
+ if (ret)
+ return ret;
+ }
+
+ ret = mxs_lradc_adc_trigger_init(iio);
+ if (ret)
+ goto err_trig;
+
+ ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
+ &mxs_lradc_adc_trigger_handler,
+ &mxs_lradc_adc_buffer_ops);
+ if (ret)
+ return ret;
+
+ adc->vref_mv = mxs_lradc_adc_vref_mv[lradc->soc];
+
+ /* Populate available ADC input ranges */
+ for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
+ for (s = 0; s < ARRAY_SIZE(adc->scale_avail[i]); s++) {
+ /*
+ * [s=0] = optional divider by two disabled (default)
+ * [s=1] = optional divider by two enabled
+ *
+ * The scale is calculated by doing:
+ * Vref >> (realbits - s)
+ * which multiplies by two on the second component
+ * of the array.
+ */
+ scale_uv = ((u64)adc->vref_mv[i] * 100000000) >>
+ (LRADC_RESOLUTION - s);
+ adc->scale_avail[i][s].nano =
+ do_div(scale_uv, 100000000) * 10;
+ adc->scale_avail[i][s].integer = scale_uv;
+ }
+ }
+
+ /* Configure the hardware. */
+ mxs_lradc_adc_hw_init(adc);
+
+ /* Register IIO device. */
+ ret = iio_device_register(iio);
+ if (ret) {
+ dev_err(dev, "Failed to register IIO device\n");
+ goto err_dev;
+ }
+
+ return 0;
+
+err_dev:
+ mxs_lradc_adc_hw_stop(adc);
+ mxs_lradc_adc_trigger_remove(iio);
+err_trig:
+ iio_triggered_buffer_cleanup(iio);
+ return ret;
+}
+
+static int mxs_lradc_adc_remove(struct platform_device *pdev)
+{
+ struct iio_dev *iio = platform_get_drvdata(pdev);
+ struct mxs_lradc_adc *adc = iio_priv(iio);
+
+ iio_device_unregister(iio);
+ mxs_lradc_adc_hw_stop(adc);
+ mxs_lradc_adc_trigger_remove(iio);
+ iio_triggered_buffer_cleanup(iio);
+
+ return 0;
+}
+
+static struct platform_driver mxs_lradc_adc_driver = {
+ .driver = {
+ .name = DRIVER_NAME_ADC,
+ },
+ .probe = mxs_lradc_adc_probe,
+ .remove = mxs_lradc_adc_remove,
+};
+
+module_platform_driver(mxs_lradc_adc_driver);
+
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
+MODULE_DESCRIPTION("Freescale MXS LRADC driver general purpose ADC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME_ADC);
--
1.9.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-06-08 14:43 [PATCH v2 0/4] mxs-lradc: Split driver into MFD Ksenija Stanojevic
2016-06-08 14:45 ` [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
2016-06-08 14:47 ` [PATCH v2 2/4] iio: adc: mxs-lradc: Add support for adc driver Ksenija Stanojevic
@ 2016-06-08 14:48 ` Ksenija Stanojevic
2016-06-15 21:26 ` Stefan Wahren
2016-06-08 14:49 ` [PATCH v2 4/4] iio: adc: mxs-lradc: Remove driver Ksenija Stanojevic
3 siblings, 1 reply; 11+ messages in thread
From: Ksenija Stanojevic @ 2016-06-08 14:48 UTC (permalink / raw)
To: linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, marex, linux-iio, harald, stefan.wahren, fabio.estevam,
Ksenija Stanojevic
Add 4-wire/5-wire touchscreen controller.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
Changes in v2:
- do not change spacing in Kconfig
- remove dev.parent
- rename err_ts_register to error
- combine functions hw_stop and disable_ts so that mxs_lradc_ts_remove
could be deleted.
- add spinlock in struct mxs_lradc_ts to enable locking in interrupt handler.
- only grab irqs that are relevant to touchscreen
- use direct return instead assigning error to touch_ret in probe function.
- change licence to GPL
- add copyright
drivers/input/touchscreen/Kconfig | 10 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/mxs-lradc-ts.c | 726 +++++++++++++++++++++++++++++++
3 files changed, 737 insertions(+)
create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 66c6264..a34661d 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -305,6 +305,16 @@ config TOUCHSCREEN_EGALAX_SERIAL
To compile this driver as a module, choose M here: the
module will be called egalax_ts_serial.
+config TOUCHSCREEN_MXS_LRADC
+ tristate "Freescale i.MX23/i.MX28 LRADC touchscreen"
+ depends on MFD_MXS_LRADC
+ help
+ Say Y here if you have a touchscreen connected to the low-resolution
+ analog-to-digital converter (LRADC) on an i.MX23 or i.MX28 processor.
+
+ To compile this driver as a module, choose M here: the module will be
+ called mxs-lradc-ts.
+
config TOUCHSCREEN_FT6236
tristate "FT6236 I2C touchscreen"
depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 968ff12..6319b5c 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
obj-$(CONFIG_TOUCHSCREEN_MMS114) += mms114.o
obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
+obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC) += mxs-lradc-ts.o
obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o
obj-$(CONFIG_TOUCHSCREEN_IPAQ_MICRO) += ipaq-micro-ts.o
diff --git a/drivers/input/touchscreen/mxs-lradc-ts.c b/drivers/input/touchscreen/mxs-lradc-ts.c
new file mode 100644
index 0000000..778bb61
--- /dev/null
+++ b/drivers/input/touchscreen/mxs-lradc-ts.c
@@ -0,0 +1,726 @@
+/*
+ * Freescale MXS LRADC driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Marek Vasut <marex@denx.de>
+ * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mxs-lradc.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static const int mxs_lradc_ts_irq[][3] = {
+ [IMX23_LRADC] = {0, 7, 8},
+ [IMX28_LRADC] = {0, 9, 10},
+};
+
+/*
+ * Touchscreen handling
+ */
+enum mxs_lradc_ts_plate {
+ LRADC_TOUCH = 0,
+ LRADC_SAMPLE_X,
+ LRADC_SAMPLE_Y,
+ LRADC_SAMPLE_PRESSURE,
+ LRADC_SAMPLE_VALID,
+};
+
+struct mxs_lradc_ts {
+ struct mxs_lradc *lradc;
+ struct device *dev;
+ /*
+ * When the touchscreen is enabled, we give it two private virtual
+ * channels: #6 and #7. This means that only 6 virtual channels (instead
+ * of 8) will be available for buffered capture.
+ */
+#define TOUCHSCREEN_VCHANNEL1 7
+#define TOUCHSCREEN_VCHANNEL2 6
+
+ struct input_dev *ts_input;
+
+ enum mxs_lradc_ts_plate cur_plate; /* state machine */
+ bool ts_valid;
+ unsigned int ts_x_pos;
+ unsigned int ts_y_pos;
+ unsigned int ts_pressure;
+
+ /* handle touchscreen's physical behaviour */
+ /* samples per coordinate */
+ unsigned int over_sample_cnt;
+ /* time clocks between samples */
+ unsigned int over_sample_delay;
+ /* time in clocks to wait after the plates where switched */
+ unsigned int settling_delay;
+ spinlock_t lock;
+};
+
+static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
+{
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_PLATE_MASK;
+ return LRADC_CTRL0_MX28_PLATE_MASK;
+}
+
+static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
+{
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
+ return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
+}
+
+static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
+{
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
+ return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
+}
+
+static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
+{
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
+ return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
+}
+
+static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
+{
+ if (lradc->soc == IMX23_LRADC)
+ return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
+ return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
+}
+
+static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
+{
+ return !!(readl(lradc->base + LRADC_STATUS) &
+ LRADC_STATUS_TOUCH_DETECT_RAW);
+}
+
+static void mxs_lradc_map_ts_channel(struct mxs_lradc *lradc, unsigned int vch,
+ unsigned int ch)
+{
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
+ LRADC_CTRL4);
+ mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
+}
+
+static void mxs_lradc_setup_ts_channel(struct mxs_lradc_ts *ts, unsigned int ch)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /*
+ * prepare for oversampling conversion
+ *
+ * from the datasheet:
+ * "The ACCUMULATE bit in the appropriate channel register
+ * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
+ * otherwise, the IRQs will not fire."
+ */
+ mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
+ LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1),
+ LRADC_CH(ch));
+
+ /* from the datasheet:
+ * "Software must clear this register in preparation for a
+ * multi-cycle accumulation.
+ */
+ mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
+
+ /*
+ * prepare the delay/loop unit according to the oversampling count
+ *
+ * from the datasheet:
+ * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
+ * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
+ * the LRADC will not trigger the delay group."
+ */
+ mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
+ LRADC_DELAY_TRIGGER_DELAYS(0) |
+ LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) |
+ LRADC_DELAY_DELAY(ts->over_sample_delay - 1),
+ LRADC_DELAY(3));
+
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
+
+ /*
+ * after changing the touchscreen plates setting
+ * the signals need some initial time to settle. Start the
+ * SoC's delay unit and start the conversion later
+ * and automatically.
+ */
+ mxs_lradc_reg_wrt(
+ lradc,
+ LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
+ LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
+ LRADC_DELAY_KICK |
+ LRADC_DELAY_DELAY(ts->settling_delay),
+ LRADC_DELAY(2));
+}
+
+/*
+ * Pressure detection is special:
+ * We want to do both required measurements for the pressure detection in
+ * one turn. Use the hardware features to chain both conversions and let the
+ * hardware report one interrupt if both conversions are done
+ */
+static void mxs_lradc_setup_ts_pressure(struct mxs_lradc_ts *ts,
+ unsigned int ch1, unsigned int ch2)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+ u32 reg;
+
+ /*
+ * prepare for oversampling conversion
+ *
+ * from the datasheet:
+ * "The ACCUMULATE bit in the appropriate channel register
+ * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
+ * otherwise, the IRQs will not fire."
+ */
+ reg = LRADC_CH_ACCUMULATE |
+ LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1);
+ mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
+ mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
+
+ /* from the datasheet:
+ * "Software must clear this register in preparation for a
+ * multi-cycle accumulation.
+ */
+ mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
+ mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
+
+ /* prepare the delay/loop unit according to the oversampling count */
+ mxs_lradc_reg_wrt(lradc,
+ LRADC_DELAY_TRIGGER(1 << ch1) |
+ LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
+ LRADC_DELAY_TRIGGER_DELAYS(0) |
+ LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) |
+ LRADC_DELAY_DELAY(ts->over_sample_delay - 1),
+ LRADC_DELAY(3));
+
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
+
+ /*
+ * after changing the touchscreen plates setting
+ * the signals need some initial time to settle. Start the
+ * SoC's delay unit and start the conversion later
+ * and automatically.
+ */
+ mxs_lradc_reg_wrt(lradc,
+ LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
+ LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
+ LRADC_DELAY_KICK |
+ LRADC_DELAY_DELAY(ts->settling_delay), LRADC_DELAY(2));
+}
+
+static unsigned int mxs_lradc_ts_read_raw_channel(struct mxs_lradc_ts *ts,
+ unsigned int channel)
+{
+ u32 reg;
+ unsigned int num_samples, val;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ reg = readl(lradc->base + LRADC_CH(channel));
+ if (reg & LRADC_CH_ACCUMULATE)
+ num_samples = ts->over_sample_cnt;
+ else
+ num_samples = 1;
+
+ val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
+ return val / num_samples;
+}
+
+static unsigned int mxs_lradc_read_ts_pressure(struct mxs_lradc_ts *ts,
+ unsigned int ch1, unsigned int ch2)
+{
+ u32 reg, mask;
+ unsigned int pressure, m1, m2;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
+ reg = readl(lradc->base + LRADC_CTRL1) & mask;
+
+ while (reg != mask) {
+ reg = readl(lradc->base + LRADC_CTRL1) & mask;
+ dev_dbg(ts->dev, "One channel is still busy: %X\n", reg);
+ }
+
+ m1 = mxs_lradc_ts_read_raw_channel(ts, ch1);
+ m2 = mxs_lradc_ts_read_raw_channel(ts, ch2);
+
+ if (m2 == 0) {
+ dev_warn(ts->dev, "Cannot calculate pressure\n");
+ return 1 << (LRADC_RESOLUTION - 1);
+ }
+
+ /* simply scale the value from 0 ... max ADC resolution */
+ pressure = m1;
+ pressure *= (1 << LRADC_RESOLUTION);
+ pressure /= m2;
+
+ dev_dbg(ts->dev, "Pressure = %u\n", pressure);
+ return pressure;
+}
+
+#define TS_CH_XP 2
+#define TS_CH_YP 3
+#define TS_CH_XM 4
+#define TS_CH_YM 5
+
+/*
+ * YP(open)--+-------------+
+ * | |--+
+ * | | |
+ * YM(-)--+-------------+ |
+ * +--------------+
+ * | |
+ * XP(weak+) XM(open)
+ *
+ * "weak+" means 200k Ohm VDDIO
+ * (-) means GND
+ */
+static void mxs_lradc_setup_touch_detection(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /*
+ * In order to detect a touch event the 'touch detect enable' bit
+ * enables:
+ * - a weak pullup to the X+ connector
+ * - a strong ground at the Y- connector
+ */
+ mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
+ mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
+ LRADC_CTRL0);
+}
+
+/*
+ * YP(meas)--+-------------+
+ * | |--+
+ * | | |
+ * YM(open)--+-------------+ |
+ * +--------------+
+ * | |
+ * XP(+) XM(-)
+ *
+ * (+) means here 1.85 V
+ * (-) means here GND
+ */
+static void mxs_lradc_prepare_x_pos(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
+ mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
+
+ ts->cur_plate = LRADC_SAMPLE_X;
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
+ mxs_lradc_setup_ts_channel(ts, TOUCHSCREEN_VCHANNEL1);
+}
+
+/*
+ * YP(+)--+-------------+
+ * | |--+
+ * | | |
+ * YM(-)--+-------------+ |
+ * +--------------+
+ * | |
+ * XP(open) XM(meas)
+ *
+ * (+) means here 1.85 V
+ * (-) means here GND
+ */
+static void mxs_lradc_prepare_y_pos(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
+ mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
+
+ ts->cur_plate = LRADC_SAMPLE_Y;
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
+ mxs_lradc_setup_ts_channel(ts, TOUCHSCREEN_VCHANNEL1);
+}
+
+/*
+ * YP(+)--+-------------+
+ * | |--+
+ * | | |
+ * YM(meas)--+-------------+ |
+ * +--------------+
+ * | |
+ * XP(meas) XM(-)
+ *
+ * (+) means here 1.85 V
+ * (-) means here GND
+ */
+static void mxs_lradc_prepare_pressure(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
+ mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
+
+ ts->cur_plate = LRADC_SAMPLE_PRESSURE;
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
+ mxs_lradc_map_ts_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
+ mxs_lradc_setup_ts_pressure(ts, TOUCHSCREEN_VCHANNEL2,
+ TOUCHSCREEN_VCHANNEL1);
+}
+
+static void mxs_lradc_enable_touch_detection(struct mxs_lradc_ts *ts)
+{
+ mxs_lradc_setup_touch_detection(ts);
+
+ ts->cur_plate = LRADC_TOUCH;
+ mxs_lradc_reg_clear(ts->lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
+ LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
+ mxs_lradc_reg_set(ts->lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ LRADC_CTRL1);
+}
+
+static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts)
+{
+ mxs_lradc_reg_clear(ts->lradc,
+ LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ LRADC_CTRL1);
+ mxs_lradc_reg_set(ts->lradc,
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
+ LRADC_CTRL1);
+ /*
+ * start with the Y-pos, because it uses nearly the same plate
+ * settings like the touch detection
+ */
+ mxs_lradc_prepare_y_pos(ts);
+}
+
+static void mxs_lradc_report_ts_event(struct mxs_lradc_ts *ts)
+{
+ input_report_abs(ts->ts_input, ABS_X, ts->ts_x_pos);
+ input_report_abs(ts->ts_input, ABS_Y, ts->ts_y_pos);
+ input_report_abs(ts->ts_input, ABS_PRESSURE, ts->ts_pressure);
+ input_report_key(ts->ts_input, BTN_TOUCH, 1);
+ input_sync(ts->ts_input);
+}
+
+static void mxs_lradc_complete_touch_event(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ mxs_lradc_setup_touch_detection(ts);
+ ts->cur_plate = LRADC_SAMPLE_VALID;
+ /*
+ * start a dummy conversion to burn time to settle the signals
+ * note: we are not interested in the conversion's value
+ */
+ mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
+ mxs_lradc_reg_clear(lradc,
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
+ LRADC_CTRL1);
+ mxs_lradc_reg_wrt(lradc,
+ LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
+ LRADC_DELAY(2));
+}
+
+/*
+ * in order to avoid false measurements, report only samples where
+ * the surface is still touched after the position measurement
+ */
+static void mxs_lradc_finish_touch_event(struct mxs_lradc_ts *ts, bool valid)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /* if it is still touched, report the sample */
+ if (valid && mxs_lradc_check_touch_event(lradc)) {
+ ts->ts_valid = true;
+ mxs_lradc_report_ts_event(ts);
+ }
+
+ /* if it is even still touched, continue with the next measurement */
+ if (mxs_lradc_check_touch_event(lradc)) {
+ mxs_lradc_prepare_y_pos(ts);
+ return;
+ }
+
+ if (ts->ts_valid) {
+ /* signal the release */
+ ts->ts_valid = false;
+ input_report_key(ts->ts_input, BTN_TOUCH, 0);
+ input_sync(ts->ts_input);
+ }
+
+ /* if it is released, wait for the next touch via IRQ */
+ ts->cur_plate = LRADC_TOUCH;
+ mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
+ mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
+ mxs_lradc_reg_clear(lradc,
+ LRADC_CTRL1_TOUCH_DETECT_IRQ |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
+ LRADC_CTRL1);
+ mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
+}
+
+/* touchscreen's state machine */
+static void mxs_lradc_handle_touch(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ switch (ts->cur_plate) {
+ case LRADC_TOUCH:
+ if (mxs_lradc_check_touch_event(lradc))
+ mxs_lradc_start_touch_event(ts);
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
+ LRADC_CTRL1);
+ return;
+
+ case LRADC_SAMPLE_Y:
+ ts->ts_y_pos =
+ mxs_lradc_ts_read_raw_channel(ts, TOUCHSCREEN_VCHANNEL1);
+ mxs_lradc_prepare_x_pos(ts);
+ return;
+
+ case LRADC_SAMPLE_X:
+ ts->ts_x_pos =
+ mxs_lradc_ts_read_raw_channel(ts, TOUCHSCREEN_VCHANNEL1);
+ mxs_lradc_prepare_pressure(ts);
+ return;
+
+ case LRADC_SAMPLE_PRESSURE:
+ ts->ts_pressure =
+ mxs_lradc_read_ts_pressure(ts,
+ TOUCHSCREEN_VCHANNEL2,
+ TOUCHSCREEN_VCHANNEL1);
+ mxs_lradc_complete_touch_event(ts);
+ return;
+
+ case LRADC_SAMPLE_VALID:
+ mxs_lradc_finish_touch_event(ts, 1);
+ break;
+ }
+}
+
+/* IRQ Handling */
+static irqreturn_t mxs_lradc_ts_handle_irq(int irq, void *data)
+{
+ struct mxs_lradc_ts *ts = data;
+ struct mxs_lradc *lradc = ts->lradc;
+ unsigned long reg = readl(lradc->base + LRADC_CTRL1);
+ u32 clr_irq = mxs_lradc_irq_mask(lradc);
+ const u32 ts_irq_mask =
+ LRADC_CTRL1_TOUCH_DETECT_IRQ |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
+ unsigned long flags;
+
+ if (!(reg & mxs_lradc_irq_mask(lradc)))
+ return IRQ_NONE;
+
+ if (reg & ts_irq_mask) {
+ spin_lock_irqsave(&ts->lock, flags);
+ mxs_lradc_handle_touch(ts);
+ spin_unlock_irqrestore(&ts->lock, flags);
+ /* Make sure we don't clear the next conversion's interrupt. */
+ clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
+ mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int mxs_lradc_ts_open(struct input_dev *dev)
+{
+ struct mxs_lradc_ts *ts = input_get_drvdata(dev);
+
+ /* Enable the touch-detect circuitry. */
+ mxs_lradc_enable_touch_detection(ts);
+
+ return 0;
+}
+
+static void mxs_lradc_ts_stop(struct mxs_lradc_ts *ts)
+{
+ int i;
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /* stop all interrupts from firing */
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
+
+ /* Power-down touchscreen touch-detect circuitry. */
+ mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
+
+ mxs_lradc_reg_clear(lradc,
+ lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ LRADC_CTRL1);
+
+ for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++)
+ mxs_lradc_reg_wrt(ts->lradc, 0, LRADC_DELAY(i));
+}
+
+static void mxs_lradc_ts_close(struct input_dev *dev)
+{
+ struct mxs_lradc_ts *ts = input_get_drvdata(dev);
+
+ mxs_lradc_ts_stop(ts);
+}
+
+static void mxs_lradc_ts_hw_init(struct mxs_lradc_ts *ts)
+{
+ struct mxs_lradc *lradc = ts->lradc;
+
+ /* Configure the touchscreen type */
+ if (lradc->soc == IMX28_LRADC) {
+ mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ LRADC_CTRL0);
+
+ if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
+ mxs_lradc_reg_set(lradc,
+ LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ LRADC_CTRL0);
+ }
+}
+
+static int mxs_lradc_ts_register(struct mxs_lradc_ts *ts)
+{
+ struct input_dev *input = ts->ts_input;
+ struct device *dev = ts->dev;
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = DRIVER_NAME_TS;
+ input->id.bustype = BUS_HOST;
+ input->open = mxs_lradc_ts_open;
+ input->close = mxs_lradc_ts_close;
+
+ __set_bit(EV_ABS, input->evbit);
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(BTN_TOUCH, input->keybit);
+ __set_bit(INPUT_PROP_DIRECT, input->propbit);
+ input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
+ input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
+ 0, 0);
+
+ ts->ts_input = input;
+ input_set_drvdata(input, ts);
+
+ return input_register_device(input);
+}
+
+static int mxs_lradc_ts_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->parent->of_node;
+ struct mxs_lradc *lradc = dev_get_platdata(dev);
+ struct mxs_lradc_ts *ts;
+ int touch_ret, ret, i, j;
+ u32 ts_wires = 0, adapt;
+ const int *irq;
+
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ts);
+
+ ts->lradc = lradc;
+ ts->dev = dev;
+ spin_lock_init(&ts->lock);
+
+ touch_ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+
+ if (of_property_read_u32(node, "fsl,ave-ctrl", &adapt)) {
+ ts->over_sample_cnt = 4;
+ } else {
+ if (adapt >= 1 || adapt <= 32) {
+ ts->over_sample_cnt = adapt;
+ } else {
+ dev_err(ts->dev, "Invalid sample count (%u)\n",
+ adapt);
+ return -EINVAL;
+ }
+ }
+
+ if (of_property_read_u32(node, "fsl,ave-delay", &adapt)) {
+ ts->over_sample_delay = 2;
+ } else {
+ if (adapt >= 2 || adapt <= LRADC_DELAY_DELAY_MASK + 1) {
+ ts->over_sample_delay = adapt;
+ } else {
+ dev_err(ts->dev, "Invalid sample delay (%u)\n",
+ adapt);
+ return -EINVAL;
+ }
+ }
+
+ if (of_property_read_u32(node, "fsl,settling", &adapt)) {
+ ts->settling_delay = 10;
+ } else {
+ if (adapt >= 1 || adapt <= LRADC_DELAY_DELAY_MASK) {
+ ts->settling_delay = adapt;
+ } else {
+ dev_err(ts->dev, "Invalid settling delay (%u)\n",
+ adapt);
+ return -EINVAL;
+ }
+ }
+
+ mxs_lradc_ts_hw_init(ts);
+
+ irq = mxs_lradc_ts_irq[lradc->soc];
+ for (i = 0; i < 3; i++) {
+ j = irq[i];
+ ret = devm_request_irq(dev, lradc->irq[j],
+ mxs_lradc_ts_handle_irq,
+ 0, lradc->irq_name[j], ts);
+ if (ret)
+ return ret;
+ }
+
+ if (!touch_ret) {
+ ret = mxs_lradc_ts_register(ts);
+ if (!ret)
+ goto error;
+ }
+
+ return 0;
+
+error:
+ mxs_lradc_ts_stop(ts);
+
+ return ret;
+}
+
+static struct platform_driver mxs_lradc_ts_driver = {
+ .driver = {
+ .name = DRIVER_NAME_TS,
+ },
+ .probe = mxs_lradc_ts_probe,
+};
+module_platform_driver(mxs_lradc_ts_driver);
+
+MODULE_LICENSE("GPL");
--
1.9.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH v2 4/4] iio: adc: mxs-lradc: Remove driver
2016-06-08 14:43 [PATCH v2 0/4] mxs-lradc: Split driver into MFD Ksenija Stanojevic
` (2 preceding siblings ...)
2016-06-08 14:48 ` [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
@ 2016-06-08 14:49 ` Ksenija Stanojevic
2016-06-11 15:50 ` Jonathan Cameron
3 siblings, 1 reply; 11+ messages in thread
From: Ksenija Stanojevic @ 2016-06-08 14:49 UTC (permalink / raw)
To: linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, marex, linux-iio, harald, stefan.wahren, fabio.estevam,
Ksenija Stanojevic
Since the driver has been split into mfd there is no reason for it to
stay, so remove it.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
Changes in v2:
- none
drivers/iio/adc/Kconfig | 14 -
drivers/iio/adc/Makefile | 1 -
drivers/iio/adc/mxs-lradc.c | 1775 -------------------------------------------
3 files changed, 1790 deletions(-)
delete mode 100644 drivers/iio/adc/mxs-lradc.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 4ef3ad1..5aba3fe 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -310,20 +310,6 @@ config MEN_Z188_ADC
This driver can also be built as a module. If so, the module will be
called men_z188_adc.
-config MXS_LRADC
- tristate "Freescale i.MX23/i.MX28 LRADC"
- depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM
- depends on INPUT
- select STMP_DEVICE
- select IIO_BUFFER
- select IIO_TRIGGERED_BUFFER
- help
- Say yes here to build support for i.MX23/i.MX28 LRADC convertor
- built into these chips.
-
- To compile this driver as a module, choose M here: the
- module will be called mxs-lradc.
-
config NAU7802
tristate "Nuvoton NAU7802 ADC driver"
depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 9bb35c4..b2382ab 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_MCP3422) += mcp3422.o
obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
-obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
obj-$(CONFIG_NAU7802) += nau7802.o
obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
deleted file mode 100644
index 33051b8..0000000
--- a/drivers/iio/adc/mxs-lradc.c
+++ /dev/null
@@ -1,1775 +0,0 @@
-/*
- * Freescale MXS LRADC driver
- *
- * Copyright (c) 2012 DENX Software Engineering, GmbH.
- * Marek Vasut <marex@denx.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/completion.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/stmp_device.h>
-#include <linux/sysfs.h>
-
-#include <linux/iio/buffer.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/trigger.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-#include <linux/iio/sysfs.h>
-
-#define DRIVER_NAME "mxs-lradc"
-
-#define LRADC_MAX_DELAY_CHANS 4
-#define LRADC_MAX_MAPPED_CHANS 8
-#define LRADC_MAX_TOTAL_CHANS 16
-
-#define LRADC_DELAY_TIMER_HZ 2000
-
-/*
- * Make this runtime configurable if necessary. Currently, if the buffered mode
- * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
- * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
- * seconds. The result is that the samples arrive every 500mS.
- */
-#define LRADC_DELAY_TIMER_PER 200
-#define LRADC_DELAY_TIMER_LOOP 5
-
-/*
- * Once the pen touches the touchscreen, the touchscreen switches from
- * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
- * is realized by worker thread, which is called every 20 or so milliseconds.
- * This gives the touchscreen enough fluency and does not strain the system
- * too much.
- */
-#define LRADC_TS_SAMPLE_DELAY_MS 5
-
-/*
- * The LRADC reads the following amount of samples from each touchscreen
- * channel and the driver then computes average of these.
- */
-#define LRADC_TS_SAMPLE_AMOUNT 4
-
-enum mxs_lradc_id {
- IMX23_LRADC,
- IMX28_LRADC,
-};
-
-static const char * const mx23_lradc_irq_names[] = {
- "mxs-lradc-touchscreen",
- "mxs-lradc-channel0",
- "mxs-lradc-channel1",
- "mxs-lradc-channel2",
- "mxs-lradc-channel3",
- "mxs-lradc-channel4",
- "mxs-lradc-channel5",
- "mxs-lradc-channel6",
- "mxs-lradc-channel7",
-};
-
-static const char * const mx28_lradc_irq_names[] = {
- "mxs-lradc-touchscreen",
- "mxs-lradc-thresh0",
- "mxs-lradc-thresh1",
- "mxs-lradc-channel0",
- "mxs-lradc-channel1",
- "mxs-lradc-channel2",
- "mxs-lradc-channel3",
- "mxs-lradc-channel4",
- "mxs-lradc-channel5",
- "mxs-lradc-channel6",
- "mxs-lradc-channel7",
- "mxs-lradc-button0",
- "mxs-lradc-button1",
-};
-
-struct mxs_lradc_of_config {
- const int irq_count;
- const char * const *irq_name;
- const u32 *vref_mv;
-};
-
-#define VREF_MV_BASE 1850
-
-static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
- VREF_MV_BASE, /* CH0 */
- VREF_MV_BASE, /* CH1 */
- VREF_MV_BASE, /* CH2 */
- VREF_MV_BASE, /* CH3 */
- VREF_MV_BASE, /* CH4 */
- VREF_MV_BASE, /* CH5 */
- VREF_MV_BASE * 2, /* CH6 VDDIO */
- VREF_MV_BASE * 4, /* CH7 VBATT */
- VREF_MV_BASE, /* CH8 Temp sense 0 */
- VREF_MV_BASE, /* CH9 Temp sense 1 */
- VREF_MV_BASE, /* CH10 */
- VREF_MV_BASE, /* CH11 */
- VREF_MV_BASE, /* CH12 USB_DP */
- VREF_MV_BASE, /* CH13 USB_DN */
- VREF_MV_BASE, /* CH14 VBG */
- VREF_MV_BASE * 4, /* CH15 VDD5V */
-};
-
-static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
- VREF_MV_BASE, /* CH0 */
- VREF_MV_BASE, /* CH1 */
- VREF_MV_BASE, /* CH2 */
- VREF_MV_BASE, /* CH3 */
- VREF_MV_BASE, /* CH4 */
- VREF_MV_BASE, /* CH5 */
- VREF_MV_BASE, /* CH6 */
- VREF_MV_BASE * 4, /* CH7 VBATT */
- VREF_MV_BASE, /* CH8 Temp sense 0 */
- VREF_MV_BASE, /* CH9 Temp sense 1 */
- VREF_MV_BASE * 2, /* CH10 VDDIO */
- VREF_MV_BASE, /* CH11 VTH */
- VREF_MV_BASE * 2, /* CH12 VDDA */
- VREF_MV_BASE, /* CH13 VDDD */
- VREF_MV_BASE, /* CH14 VBG */
- VREF_MV_BASE * 4, /* CH15 VDD5V */
-};
-
-static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
- [IMX23_LRADC] = {
- .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
- .irq_name = mx23_lradc_irq_names,
- .vref_mv = mx23_vref_mv,
- },
- [IMX28_LRADC] = {
- .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
- .irq_name = mx28_lradc_irq_names,
- .vref_mv = mx28_vref_mv,
- },
-};
-
-enum mxs_lradc_ts {
- MXS_LRADC_TOUCHSCREEN_NONE = 0,
- MXS_LRADC_TOUCHSCREEN_4WIRE,
- MXS_LRADC_TOUCHSCREEN_5WIRE,
-};
-
-/*
- * Touchscreen handling
- */
-enum lradc_ts_plate {
- LRADC_TOUCH = 0,
- LRADC_SAMPLE_X,
- LRADC_SAMPLE_Y,
- LRADC_SAMPLE_PRESSURE,
- LRADC_SAMPLE_VALID,
-};
-
-enum mxs_lradc_divbytwo {
- MXS_LRADC_DIV_DISABLED = 0,
- MXS_LRADC_DIV_ENABLED,
-};
-
-struct mxs_lradc_scale {
- unsigned int integer;
- unsigned int nano;
-};
-
-struct mxs_lradc {
- struct device *dev;
- void __iomem *base;
- int irq[13];
-
- struct clk *clk;
-
- u32 *buffer;
- struct iio_trigger *trig;
-
- struct mutex lock;
-
- struct completion completion;
-
- const u32 *vref_mv;
- struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
- unsigned long is_divided;
-
- /*
- * When the touchscreen is enabled, we give it two private virtual
- * channels: #6 and #7. This means that only 6 virtual channels (instead
- * of 8) will be available for buffered capture.
- */
-#define TOUCHSCREEN_VCHANNEL1 7
-#define TOUCHSCREEN_VCHANNEL2 6
-#define BUFFER_VCHANS_LIMITED 0x3f
-#define BUFFER_VCHANS_ALL 0xff
- u8 buffer_vchans;
-
- /*
- * Furthermore, certain LRADC channels are shared between touchscreen
- * and/or touch-buttons and generic LRADC block. Therefore when using
- * either of these, these channels are not available for the regular
- * sampling. The shared channels are as follows:
- *
- * CH0 -- Touch button #0
- * CH1 -- Touch button #1
- * CH2 -- Touch screen XPUL
- * CH3 -- Touch screen YPLL
- * CH4 -- Touch screen XNUL
- * CH5 -- Touch screen YNLR
- * CH6 -- Touch screen WIPER (5-wire only)
- *
- * The bit fields below represents which parts of the LRADC block are
- * switched into special mode of operation. These channels can not
- * be sampled as regular LRADC channels. The driver will refuse any
- * attempt to sample these channels.
- */
-#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
-#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
-#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
- enum mxs_lradc_ts use_touchscreen;
- bool use_touchbutton;
-
- struct input_dev *ts_input;
-
- enum mxs_lradc_id soc;
- enum lradc_ts_plate cur_plate; /* state machine */
- bool ts_valid;
- unsigned ts_x_pos;
- unsigned ts_y_pos;
- unsigned ts_pressure;
-
- /* handle touchscreen's physical behaviour */
- /* samples per coordinate */
- unsigned over_sample_cnt;
- /* time clocks between samples */
- unsigned over_sample_delay;
- /* time in clocks to wait after the plates where switched */
- unsigned settling_delay;
-};
-
-#define LRADC_CTRL0 0x00
-# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
-# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
-# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
-# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
-# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
-# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
-# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
-# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
-
-# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
-# define LRADC_CTRL0_MX23_YM BIT(19)
-# define LRADC_CTRL0_MX23_XM BIT(18)
-# define LRADC_CTRL0_MX23_YP BIT(17)
-# define LRADC_CTRL0_MX23_XP BIT(16)
-
-# define LRADC_CTRL0_MX28_PLATE_MASK \
- (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
- LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
- LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
- LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
-
-# define LRADC_CTRL0_MX23_PLATE_MASK \
- (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
- LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
- LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
-
-#define LRADC_CTRL1 0x10
-#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
-#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
-#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
-#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
-#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
-#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
-#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
-#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
-#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
-#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
-
-#define LRADC_CTRL2 0x20
-#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
-#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
-
-#define LRADC_STATUS 0x40
-#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
-
-#define LRADC_CH(n) (0x50 + (0x10 * (n)))
-#define LRADC_CH_ACCUMULATE BIT(29)
-#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
-#define LRADC_CH_NUM_SAMPLES_OFFSET 24
-#define LRADC_CH_NUM_SAMPLES(x) \
- ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
-#define LRADC_CH_VALUE_MASK 0x3ffff
-#define LRADC_CH_VALUE_OFFSET 0
-
-#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
-#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
-#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
-#define LRADC_DELAY_TRIGGER(x) \
- (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
- LRADC_DELAY_TRIGGER_LRADCS_MASK)
-#define LRADC_DELAY_KICK BIT(20)
-#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
-#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
-#define LRADC_DELAY_TRIGGER_DELAYS(x) \
- (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
- LRADC_DELAY_TRIGGER_DELAYS_MASK)
-#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
-#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
-#define LRADC_DELAY_LOOP(x) \
- (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
- LRADC_DELAY_LOOP_COUNT_MASK)
-#define LRADC_DELAY_DELAY_MASK 0x7ff
-#define LRADC_DELAY_DELAY_OFFSET 0
-#define LRADC_DELAY_DELAY(x) \
- (((x) << LRADC_DELAY_DELAY_OFFSET) & \
- LRADC_DELAY_DELAY_MASK)
-
-#define LRADC_CTRL4 0x140
-#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
-#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
-#define LRADC_CTRL4_LRADCSELECT(n, x) \
- (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
- LRADC_CTRL4_LRADCSELECT_MASK(n))
-
-#define LRADC_RESOLUTION 12
-#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
-
-static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
- writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
-}
-
-static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
- writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
-}
-
-static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
- writel(val, lradc->base + reg);
-}
-
-static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_PLATE_MASK;
- return LRADC_CTRL0_MX28_PLATE_MASK;
-}
-
-static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
- return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
-}
-
-static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
- return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
-}
-
-static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
- return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
-}
-
-static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
- return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
-}
-
-static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
- return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
-}
-
-static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
- return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
-}
-
-static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
-{
- return !!(readl(lradc->base + LRADC_STATUS) &
- LRADC_STATUS_TOUCH_DETECT_RAW);
-}
-
-static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
- unsigned ch)
-{
- mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
- LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
-}
-
-static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
-{
- /*
- * prepare for oversampling conversion
- *
- * from the datasheet:
- * "The ACCUMULATE bit in the appropriate channel register
- * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
- * otherwise, the IRQs will not fire."
- */
- mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
- LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
- LRADC_CH(ch));
-
- /*
- * from the datasheet:
- * "Software must clear this register in preparation for a
- * multi-cycle accumulation.
- */
- mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
-
- /*
- * prepare the delay/loop unit according to the oversampling count
- *
- * from the datasheet:
- * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
- * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
- * the LRADC will not trigger the delay group."
- */
- mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
- LRADC_DELAY_TRIGGER_DELAYS(0) |
- LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
- LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
- LRADC_DELAY(3));
-
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
-
- /*
- * after changing the touchscreen plates setting
- * the signals need some initial time to settle. Start the
- * SoC's delay unit and start the conversion later
- * and automatically.
- */
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
- LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
- LRADC_DELAY_KICK |
- LRADC_DELAY_DELAY(lradc->settling_delay),
- LRADC_DELAY(2));
-}
-
-/*
- * Pressure detection is special:
- * We want to do both required measurements for the pressure detection in
- * one turn. Use the hardware features to chain both conversions and let the
- * hardware report one interrupt if both conversions are done
- */
-static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
- unsigned ch2)
-{
- u32 reg;
-
- /*
- * prepare for oversampling conversion
- *
- * from the datasheet:
- * "The ACCUMULATE bit in the appropriate channel register
- * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
- * otherwise, the IRQs will not fire."
- */
- reg = LRADC_CH_ACCUMULATE |
- LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
- mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
- mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
-
- /*
- * from the datasheet:
- * "Software must clear this register in preparation for a
- * multi-cycle accumulation.
- */
- mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
- mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
-
- /* prepare the delay/loop unit according to the oversampling count */
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(1 << ch1) |
- LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
- LRADC_DELAY_TRIGGER_DELAYS(0) |
- LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
- LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
- LRADC_DELAY(3));
-
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
-
- /*
- * after changing the touchscreen plates setting
- * the signals need some initial time to settle. Start the
- * SoC's delay unit and start the conversion later
- * and automatically.
- */
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
- LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
- LRADC_DELAY_KICK |
- LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
-}
-
-static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
- unsigned channel)
-{
- u32 reg;
- unsigned num_samples, val;
-
- reg = readl(lradc->base + LRADC_CH(channel));
- if (reg & LRADC_CH_ACCUMULATE)
- num_samples = lradc->over_sample_cnt;
- else
- num_samples = 1;
-
- val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
- return val / num_samples;
-}
-
-static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
- unsigned ch1, unsigned ch2)
-{
- u32 reg, mask;
- unsigned pressure, m1, m2;
-
- mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
- reg = readl(lradc->base + LRADC_CTRL1) & mask;
-
- while (reg != mask) {
- reg = readl(lradc->base + LRADC_CTRL1) & mask;
- dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
- }
-
- m1 = mxs_lradc_read_raw_channel(lradc, ch1);
- m2 = mxs_lradc_read_raw_channel(lradc, ch2);
-
- if (m2 == 0) {
- dev_warn(lradc->dev, "Cannot calculate pressure\n");
- return 1 << (LRADC_RESOLUTION - 1);
- }
-
- /* simply scale the value from 0 ... max ADC resolution */
- pressure = m1;
- pressure *= (1 << LRADC_RESOLUTION);
- pressure /= m2;
-
- dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
- return pressure;
-}
-
-#define TS_CH_XP 2
-#define TS_CH_YP 3
-#define TS_CH_XM 4
-#define TS_CH_YM 5
-
-/*
- * YP(open)--+-------------+
- * | |--+
- * | | |
- * YM(-)--+-------------+ |
- * +--------------+
- * | |
- * XP(weak+) XM(open)
- *
- * "weak+" means 200k Ohm VDDIO
- * (-) means GND
- */
-static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
-{
- /*
- * In order to detect a touch event the 'touch detect enable' bit
- * enables:
- * - a weak pullup to the X+ connector
- * - a strong ground at the Y- connector
- */
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
- LRADC_CTRL0);
-}
-
-/*
- * YP(meas)--+-------------+
- * | |--+
- * | | |
- * YM(open)--+-------------+ |
- * +--------------+
- * | |
- * XP(+) XM(-)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
-
- lradc->cur_plate = LRADC_SAMPLE_X;
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
- mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
-}
-
-/*
- * YP(+)--+-------------+
- * | |--+
- * | | |
- * YM(-)--+-------------+ |
- * +--------------+
- * | |
- * XP(open) XM(meas)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
-
- lradc->cur_plate = LRADC_SAMPLE_Y;
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
- mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
-}
-
-/*
- * YP(+)--+-------------+
- * | |--+
- * | | |
- * YM(meas)--+-------------+ |
- * +--------------+
- * | |
- * XP(meas) XM(-)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
-
- lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
- mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
- TOUCHSCREEN_VCHANNEL1);
-}
-
-static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
-{
- mxs_lradc_setup_touch_detection(lradc);
-
- lradc->cur_plate = LRADC_TOUCH;
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
- LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-}
-
-static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc,
- LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
- LRADC_CTRL1);
- mxs_lradc_reg_set(lradc,
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
- LRADC_CTRL1);
- /*
- * start with the Y-pos, because it uses nearly the same plate
- * settings like the touch detection
- */
- mxs_lradc_prepare_y_pos(lradc);
-}
-
-static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
-{
- input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
- input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
- input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
- input_report_key(lradc->ts_input, BTN_TOUCH, 1);
- input_sync(lradc->ts_input);
-}
-
-static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
-{
- mxs_lradc_setup_touch_detection(lradc);
- lradc->cur_plate = LRADC_SAMPLE_VALID;
- /*
- * start a dummy conversion to burn time to settle the signals
- * note: we are not interested in the conversion's value
- */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
- mxs_lradc_reg_clear(lradc,
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
- LRADC_CTRL1);
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
- LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
- LRADC_DELAY(2));
-}
-
-/*
- * in order to avoid false measurements, report only samples where
- * the surface is still touched after the position measurement
- */
-static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
-{
- /* if it is still touched, report the sample */
- if (valid && mxs_lradc_check_touch_event(lradc)) {
- lradc->ts_valid = true;
- mxs_lradc_report_ts_event(lradc);
- }
-
- /* if it is even still touched, continue with the next measurement */
- if (mxs_lradc_check_touch_event(lradc)) {
- mxs_lradc_prepare_y_pos(lradc);
- return;
- }
-
- if (lradc->ts_valid) {
- /* signal the release */
- lradc->ts_valid = false;
- input_report_key(lradc->ts_input, BTN_TOUCH, 0);
- input_sync(lradc->ts_input);
- }
-
- /* if it is released, wait for the next touch via IRQ */
- lradc->cur_plate = LRADC_TOUCH;
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
- mxs_lradc_reg_clear(lradc,
- LRADC_CTRL1_TOUCH_DETECT_IRQ |
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
- LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-}
-
-/* touchscreen's state machine */
-static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
-{
- switch (lradc->cur_plate) {
- case LRADC_TOUCH:
- if (mxs_lradc_check_touch_event(lradc))
- mxs_lradc_start_touch_event(lradc);
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
- LRADC_CTRL1);
- return;
-
- case LRADC_SAMPLE_Y:
- lradc->ts_y_pos =
- mxs_lradc_read_raw_channel(lradc,
- TOUCHSCREEN_VCHANNEL1);
- mxs_lradc_prepare_x_pos(lradc);
- return;
-
- case LRADC_SAMPLE_X:
- lradc->ts_x_pos =
- mxs_lradc_read_raw_channel(lradc,
- TOUCHSCREEN_VCHANNEL1);
- mxs_lradc_prepare_pressure(lradc);
- return;
-
- case LRADC_SAMPLE_PRESSURE:
- lradc->ts_pressure =
- mxs_lradc_read_ts_pressure(lradc,
- TOUCHSCREEN_VCHANNEL2,
- TOUCHSCREEN_VCHANNEL1);
- mxs_lradc_complete_touch_event(lradc);
- return;
-
- case LRADC_SAMPLE_VALID:
- mxs_lradc_finish_touch_event(lradc, 1);
- break;
- }
-}
-
-/*
- * Raw I/O operations
- */
-static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
-{
- struct mxs_lradc *lradc = iio_priv(iio_dev);
- int ret;
-
- /*
- * See if there is no buffered operation in progress. If there is, simply
- * bail out. This can be improved to support both buffered and raw IO at
- * the same time, yet the code becomes horribly complicated. Therefore I
- * applied KISS principle here.
- */
- ret = mutex_trylock(&lradc->lock);
- if (!ret)
- return -EBUSY;
-
- reinit_completion(&lradc->completion);
-
- /*
- * No buffered operation in progress, map the channel and trigger it.
- * Virtual channel 0 is always used here as the others are always not
- * used if doing raw sampling.
- */
- if (lradc->soc == IMX28_LRADC)
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
- LRADC_CTRL1);
- mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
-
- /* Enable / disable the divider per requirement */
- if (test_bit(chan, &lradc->is_divided))
- mxs_lradc_reg_set(lradc,
- 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
- LRADC_CTRL2);
- else
- mxs_lradc_reg_clear(lradc,
- 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
- LRADC_CTRL2);
-
- /* Clean the slot's previous content, then set new one. */
- mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
- LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
-
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
-
- /* Enable the IRQ and start sampling the channel. */
- mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
-
- /* Wait for completion on the channel, 1 second max. */
- ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
- if (!ret)
- ret = -ETIMEDOUT;
- if (ret < 0)
- goto err;
-
- /* Read the data. */
- *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
- ret = IIO_VAL_INT;
-
-err:
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
-
- mutex_unlock(&lradc->lock);
-
- return ret;
-}
-
-static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
-{
- int ret, min, max;
-
- ret = mxs_lradc_read_single(iio_dev, 8, &min);
- if (ret != IIO_VAL_INT)
- return ret;
-
- ret = mxs_lradc_read_single(iio_dev, 9, &max);
- if (ret != IIO_VAL_INT)
- return ret;
-
- *val = max - min;
-
- return IIO_VAL_INT;
-}
-
-static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
- const struct iio_chan_spec *chan,
- int *val, int *val2, long m)
-{
- struct mxs_lradc *lradc = iio_priv(iio_dev);
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- if (chan->type == IIO_TEMP)
- return mxs_lradc_read_temp(iio_dev, val);
-
- return mxs_lradc_read_single(iio_dev, chan->channel, val);
-
- case IIO_CHAN_INFO_SCALE:
- if (chan->type == IIO_TEMP) {
- /*
- * From the datasheet, we have to multiply by 1.012 and
- * divide by 4
- */
- *val = 0;
- *val2 = 253000;
- return IIO_VAL_INT_PLUS_MICRO;
- }
-
- *val = lradc->vref_mv[chan->channel];
- *val2 = chan->scan_type.realbits -
- test_bit(chan->channel, &lradc->is_divided);
- return IIO_VAL_FRACTIONAL_LOG2;
-
- case IIO_CHAN_INFO_OFFSET:
- if (chan->type == IIO_TEMP) {
- /*
- * The calculated value from the ADC is in Kelvin, we
- * want Celsius for hwmon so the offset is -273.15
- * The offset is applied before scaling so it is
- * actually -213.15 * 4 / 1.012 = -1079.644268
- */
- *val = -1079;
- *val2 = 644268;
-
- return IIO_VAL_INT_PLUS_MICRO;
- }
-
- return -EINVAL;
-
- default:
- break;
- }
-
- return -EINVAL;
-}
-
-static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
- const struct iio_chan_spec *chan,
- int val, int val2, long m)
-{
- struct mxs_lradc *lradc = iio_priv(iio_dev);
- struct mxs_lradc_scale *scale_avail =
- lradc->scale_avail[chan->channel];
- int ret;
-
- ret = mutex_trylock(&lradc->lock);
- if (!ret)
- return -EBUSY;
-
- switch (m) {
- case IIO_CHAN_INFO_SCALE:
- ret = -EINVAL;
- if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
- val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
- /* divider by two disabled */
- clear_bit(chan->channel, &lradc->is_divided);
- ret = 0;
- } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
- val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
- /* divider by two enabled */
- set_bit(chan->channel, &lradc->is_divided);
- ret = 0;
- }
-
- break;
- default:
- ret = -EINVAL;
- break;
- }
-
- mutex_unlock(&lradc->lock);
-
- return ret;
-}
-
-static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
- const struct iio_chan_spec *chan,
- long m)
-{
- return IIO_VAL_INT_PLUS_NANO;
-}
-
-static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
- struct device_attribute *attr,
- char *buf,
- int ch)
-{
- struct iio_dev *iio = dev_to_iio_dev(dev);
- struct mxs_lradc *lradc = iio_priv(iio);
- int i, len = 0;
-
- for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
- len += sprintf(buf + len, "%u.%09u ",
- lradc->scale_avail[ch][i].integer,
- lradc->scale_avail[ch][i].nano);
-
- len += sprintf(buf + len, "\n");
-
- return len;
-}
-
-static ssize_t mxs_lradc_show_scale_available(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
-
- return mxs_lradc_show_scale_available_ch(dev, attr, buf,
- iio_attr->address);
-}
-
-#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
-static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
- mxs_lradc_show_scale_available, NULL, ch)
-
-SHOW_SCALE_AVAILABLE_ATTR(0);
-SHOW_SCALE_AVAILABLE_ATTR(1);
-SHOW_SCALE_AVAILABLE_ATTR(2);
-SHOW_SCALE_AVAILABLE_ATTR(3);
-SHOW_SCALE_AVAILABLE_ATTR(4);
-SHOW_SCALE_AVAILABLE_ATTR(5);
-SHOW_SCALE_AVAILABLE_ATTR(6);
-SHOW_SCALE_AVAILABLE_ATTR(7);
-SHOW_SCALE_AVAILABLE_ATTR(10);
-SHOW_SCALE_AVAILABLE_ATTR(11);
-SHOW_SCALE_AVAILABLE_ATTR(12);
-SHOW_SCALE_AVAILABLE_ATTR(13);
-SHOW_SCALE_AVAILABLE_ATTR(14);
-SHOW_SCALE_AVAILABLE_ATTR(15);
-
-static struct attribute *mxs_lradc_attributes[] = {
- &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
- NULL
-};
-
-static const struct attribute_group mxs_lradc_attribute_group = {
- .attrs = mxs_lradc_attributes,
-};
-
-static const struct iio_info mxs_lradc_iio_info = {
- .driver_module = THIS_MODULE,
- .read_raw = mxs_lradc_read_raw,
- .write_raw = mxs_lradc_write_raw,
- .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
- .attrs = &mxs_lradc_attribute_group,
-};
-
-static int mxs_lradc_ts_open(struct input_dev *dev)
-{
- struct mxs_lradc *lradc = input_get_drvdata(dev);
-
- /* Enable the touch-detect circuitry. */
- mxs_lradc_enable_touch_detection(lradc);
-
- return 0;
-}
-
-static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
-{
- /* stop all interrupts from firing */
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
-
- /* Power-down touchscreen touch-detect circuitry. */
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
-}
-
-static void mxs_lradc_ts_close(struct input_dev *dev)
-{
- struct mxs_lradc *lradc = input_get_drvdata(dev);
-
- mxs_lradc_disable_ts(lradc);
-}
-
-static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
-{
- struct input_dev *input;
- struct device *dev = lradc->dev;
- int ret;
-
- if (!lradc->use_touchscreen)
- return 0;
-
- input = input_allocate_device();
- if (!input)
- return -ENOMEM;
-
- input->name = DRIVER_NAME;
- input->id.bustype = BUS_HOST;
- input->dev.parent = dev;
- input->open = mxs_lradc_ts_open;
- input->close = mxs_lradc_ts_close;
-
- __set_bit(EV_ABS, input->evbit);
- __set_bit(EV_KEY, input->evbit);
- __set_bit(BTN_TOUCH, input->keybit);
- input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
- input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
- input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
- 0, 0);
-
- lradc->ts_input = input;
- input_set_drvdata(input, lradc);
- ret = input_register_device(input);
- if (ret)
- input_free_device(lradc->ts_input);
-
- return ret;
-}
-
-static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
-{
- if (!lradc->use_touchscreen)
- return;
-
- mxs_lradc_disable_ts(lradc);
- input_unregister_device(lradc->ts_input);
-}
-
-/*
- * IRQ Handling
- */
-static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
-{
- struct iio_dev *iio = data;
- struct mxs_lradc *lradc = iio_priv(iio);
- unsigned long reg = readl(lradc->base + LRADC_CTRL1);
- u32 clr_irq = mxs_lradc_irq_mask(lradc);
- const u32 ts_irq_mask =
- LRADC_CTRL1_TOUCH_DETECT_IRQ |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
-
- if (!(reg & mxs_lradc_irq_mask(lradc)))
- return IRQ_NONE;
-
- if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
- mxs_lradc_handle_touch(lradc);
-
- /* Make sure we don't clear the next conversion's interrupt. */
- clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
- }
-
- if (iio_buffer_enabled(iio)) {
- if (reg & lradc->buffer_vchans)
- iio_trigger_poll(iio->trig);
- } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
- complete(&lradc->completion);
- }
-
- mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
-
- return IRQ_HANDLED;
-}
-
-/*
- * Trigger handling
- */
-static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct iio_dev *iio = pf->indio_dev;
- struct mxs_lradc *lradc = iio_priv(iio);
- const u32 chan_value = LRADC_CH_ACCUMULATE |
- ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
- unsigned int i, j = 0;
-
- for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
- lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
- mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
- lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
- lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
- j++;
- }
-
- iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
-
- iio_trigger_notify_done(iio->trig);
-
- return IRQ_HANDLED;
-}
-
-static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
-{
- struct iio_dev *iio = iio_trigger_get_drvdata(trig);
- struct mxs_lradc *lradc = iio_priv(iio);
- const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
-
- mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
-
- return 0;
-}
-
-static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
- .owner = THIS_MODULE,
- .set_trigger_state = &mxs_lradc_configure_trigger,
-};
-
-static int mxs_lradc_trigger_init(struct iio_dev *iio)
-{
- int ret;
- struct iio_trigger *trig;
- struct mxs_lradc *lradc = iio_priv(iio);
-
- trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
- if (!trig)
- return -ENOMEM;
-
- trig->dev.parent = lradc->dev;
- iio_trigger_set_drvdata(trig, iio);
- trig->ops = &mxs_lradc_trigger_ops;
-
- ret = iio_trigger_register(trig);
- if (ret) {
- iio_trigger_free(trig);
- return ret;
- }
-
- lradc->trig = trig;
-
- return 0;
-}
-
-static void mxs_lradc_trigger_remove(struct iio_dev *iio)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
-
- iio_trigger_unregister(lradc->trig);
- iio_trigger_free(lradc->trig);
-}
-
-static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
- int ret = 0, chan, ofs = 0;
- unsigned long enable = 0;
- u32 ctrl4_set = 0;
- u32 ctrl4_clr = 0;
- u32 ctrl1_irq = 0;
- const u32 chan_value = LRADC_CH_ACCUMULATE |
- ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
- const int len = bitmap_weight(iio->active_scan_mask,
- LRADC_MAX_TOTAL_CHANS);
-
- if (!len)
- return -EINVAL;
-
- /*
- * Lock the driver so raw access can not be done during buffered
- * operation. This simplifies the code a lot.
- */
- ret = mutex_trylock(&lradc->lock);
- if (!ret)
- return -EBUSY;
-
- lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
- if (!lradc->buffer) {
- ret = -ENOMEM;
- goto err_mem;
- }
-
- if (lradc->soc == IMX28_LRADC)
- mxs_lradc_reg_clear(
- lradc,
- lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
- LRADC_CTRL1);
- mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
-
- for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
- ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
- ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
- ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
- mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
- bitmap_set(&enable, ofs, 1);
- ofs++;
- }
-
- mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
- LRADC_DELAY_KICK, LRADC_DELAY(0));
- mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
- LRADC_DELAY(0));
-
- return 0;
-
-err_mem:
- mutex_unlock(&lradc->lock);
- return ret;
-}
-
-static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
-
- mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
- LRADC_DELAY_KICK, LRADC_DELAY(0));
-
- mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
- if (lradc->soc == IMX28_LRADC)
- mxs_lradc_reg_clear(
- lradc,
- lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
- LRADC_CTRL1);
-
- kfree(lradc->buffer);
- mutex_unlock(&lradc->lock);
-
- return 0;
-}
-
-static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
- const unsigned long *mask)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
- const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
- int rsvd_chans = 0;
- unsigned long rsvd_mask = 0;
-
- if (lradc->use_touchbutton)
- rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
- if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
- rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
- if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
- rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
-
- if (lradc->use_touchbutton)
- rsvd_chans++;
- if (lradc->use_touchscreen)
- rsvd_chans += 2;
-
- /* Test for attempts to map channels with special mode of operation. */
- if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
- return false;
-
- /* Test for attempts to map more channels then available slots. */
- if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
- return false;
-
- return true;
-}
-
-static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
- .preenable = &mxs_lradc_buffer_preenable,
- .postenable = &iio_triggered_buffer_postenable,
- .predisable = &iio_triggered_buffer_predisable,
- .postdisable = &mxs_lradc_buffer_postdisable,
- .validate_scan_mask = &mxs_lradc_validate_scan_mask,
-};
-
-/*
- * Driver initialization
- */
-
-#define MXS_ADC_CHAN(idx, chan_type, name) { \
- .type = (chan_type), \
- .indexed = 1, \
- .scan_index = (idx), \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
- BIT(IIO_CHAN_INFO_SCALE), \
- .channel = (idx), \
- .address = (idx), \
- .scan_type = { \
- .sign = 'u', \
- .realbits = LRADC_RESOLUTION, \
- .storagebits = 32, \
- }, \
- .datasheet_name = (name), \
-}
-
-static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
- MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
- MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
- MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
- MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
- MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
- MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
- MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
- MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
- /* Combined Temperature sensors */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = 8,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_OFFSET) |
- BIT(IIO_CHAN_INFO_SCALE),
- .channel = 8,
- .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
- .datasheet_name = "TEMP_DIE",
- },
- /* Hidden channel to keep indexes */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = -1,
- .channel = 9,
- },
- MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
- MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
- MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
- MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
- MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
- MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
-};
-
-static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
- MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
- MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
- MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
- MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
- MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
- MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
- MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
- MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
- /* Combined Temperature sensors */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = 8,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_OFFSET) |
- BIT(IIO_CHAN_INFO_SCALE),
- .channel = 8,
- .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
- .datasheet_name = "TEMP_DIE",
- },
- /* Hidden channel to keep indexes */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = -1,
- .channel = 9,
- },
- MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
- MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
- MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
- MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
- MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
- MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
-};
-
-static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
-{
- /* The ADC always uses DELAY CHANNEL 0. */
- const u32 adc_cfg =
- (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
- (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
-
- int ret = stmp_reset_block(lradc->base);
-
- if (ret)
- return ret;
-
- /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
- mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
-
- /* Disable remaining DELAY CHANNELs */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
-
- /* Configure the touchscreen type */
- if (lradc->soc == IMX28_LRADC) {
- mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
- LRADC_CTRL0);
-
- if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
- mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
- LRADC_CTRL0);
- }
-
- /* Start internal temperature sensing. */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
-
- return 0;
-}
-
-static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
-{
- int i;
-
- mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1);
-
- for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
-}
-
-static const struct of_device_id mxs_lradc_dt_ids[] = {
- { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
- { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
-
-static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
- struct device_node *lradc_node)
-{
- int ret;
- u32 ts_wires = 0, adapt;
-
- ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
- &ts_wires);
- if (ret)
- return -ENODEV; /* touchscreen feature disabled */
-
- switch (ts_wires) {
- case 4:
- lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
- break;
- case 5:
- if (lradc->soc == IMX28_LRADC) {
- lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
- break;
- }
- /* fall through an error message for i.MX23 */
- default:
- dev_err(lradc->dev,
- "Unsupported number of touchscreen wires (%d)\n",
- ts_wires);
- return -EINVAL;
- }
-
- if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
- lradc->over_sample_cnt = 4;
- } else {
- if (adapt < 1 || adapt > 32) {
- dev_err(lradc->dev, "Invalid sample count (%u)\n",
- adapt);
- return -EINVAL;
- }
- lradc->over_sample_cnt = adapt;
- }
-
- if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
- lradc->over_sample_delay = 2;
- } else {
- if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
- dev_err(lradc->dev, "Invalid sample delay (%u)\n",
- adapt);
- return -EINVAL;
- }
- lradc->over_sample_delay = adapt;
- }
-
- if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
- lradc->settling_delay = 10;
- } else {
- if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
- dev_err(lradc->dev, "Invalid settling delay (%u)\n",
- adapt);
- return -EINVAL;
- }
- lradc->settling_delay = adapt;
- }
-
- return 0;
-}
-
-static int mxs_lradc_probe(struct platform_device *pdev)
-{
- const struct of_device_id *of_id =
- of_match_device(mxs_lradc_dt_ids, &pdev->dev);
- const struct mxs_lradc_of_config *of_cfg =
- &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
- struct device *dev = &pdev->dev;
- struct device_node *node = dev->of_node;
- struct mxs_lradc *lradc;
- struct iio_dev *iio;
- struct resource *iores;
- int ret = 0, touch_ret;
- int i, s;
- u64 scale_uv;
-
- /* Allocate the IIO device. */
- iio = devm_iio_device_alloc(dev, sizeof(*lradc));
- if (!iio) {
- dev_err(dev, "Failed to allocate IIO device\n");
- return -ENOMEM;
- }
-
- lradc = iio_priv(iio);
- lradc->soc = (enum mxs_lradc_id)of_id->data;
-
- /* Grab the memory area */
- iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- lradc->dev = &pdev->dev;
- lradc->base = devm_ioremap_resource(dev, iores);
- if (IS_ERR(lradc->base))
- return PTR_ERR(lradc->base);
-
- lradc->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(lradc->clk)) {
- dev_err(dev, "Failed to get the delay unit clock\n");
- return PTR_ERR(lradc->clk);
- }
- ret = clk_prepare_enable(lradc->clk);
- if (ret != 0) {
- dev_err(dev, "Failed to enable the delay unit clock\n");
- return ret;
- }
-
- touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
-
- if (touch_ret == 0)
- lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
- else
- lradc->buffer_vchans = BUFFER_VCHANS_ALL;
-
- /* Grab all IRQ sources */
- for (i = 0; i < of_cfg->irq_count; i++) {
- lradc->irq[i] = platform_get_irq(pdev, i);
- if (lradc->irq[i] < 0) {
- ret = lradc->irq[i];
- goto err_clk;
- }
-
- ret = devm_request_irq(dev, lradc->irq[i],
- mxs_lradc_handle_irq, 0,
- of_cfg->irq_name[i], iio);
- if (ret)
- goto err_clk;
- }
-
- lradc->vref_mv = of_cfg->vref_mv;
-
- platform_set_drvdata(pdev, iio);
-
- init_completion(&lradc->completion);
- mutex_init(&lradc->lock);
-
- iio->name = pdev->name;
- iio->dev.parent = &pdev->dev;
- iio->info = &mxs_lradc_iio_info;
- iio->modes = INDIO_DIRECT_MODE;
- iio->masklength = LRADC_MAX_TOTAL_CHANS;
-
- if (lradc->soc == IMX23_LRADC) {
- iio->channels = mx23_lradc_chan_spec;
- iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
- } else {
- iio->channels = mx28_lradc_chan_spec;
- iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
- }
-
- ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
- &mxs_lradc_trigger_handler,
- &mxs_lradc_buffer_ops);
- if (ret)
- goto err_clk;
-
- ret = mxs_lradc_trigger_init(iio);
- if (ret)
- goto err_trig;
-
- /* Populate available ADC input ranges */
- for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
- for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
- /*
- * [s=0] = optional divider by two disabled (default)
- * [s=1] = optional divider by two enabled
- *
- * The scale is calculated by doing:
- * Vref >> (realbits - s)
- * which multiplies by two on the second component
- * of the array.
- */
- scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
- (LRADC_RESOLUTION - s);
- lradc->scale_avail[i][s].nano =
- do_div(scale_uv, 100000000) * 10;
- lradc->scale_avail[i][s].integer = scale_uv;
- }
- }
-
- /* Configure the hardware. */
- ret = mxs_lradc_hw_init(lradc);
- if (ret)
- goto err_dev;
-
- /* Register the touchscreen input device. */
- if (touch_ret == 0) {
- ret = mxs_lradc_ts_register(lradc);
- if (ret)
- goto err_ts_register;
- }
-
- /* Register IIO device. */
- ret = iio_device_register(iio);
- if (ret) {
- dev_err(dev, "Failed to register IIO device\n");
- goto err_ts;
- }
-
- return 0;
-
-err_ts:
- mxs_lradc_ts_unregister(lradc);
-err_ts_register:
- mxs_lradc_hw_stop(lradc);
-err_dev:
- mxs_lradc_trigger_remove(iio);
-err_trig:
- iio_triggered_buffer_cleanup(iio);
-err_clk:
- clk_disable_unprepare(lradc->clk);
- return ret;
-}
-
-static int mxs_lradc_remove(struct platform_device *pdev)
-{
- struct iio_dev *iio = platform_get_drvdata(pdev);
- struct mxs_lradc *lradc = iio_priv(iio);
-
- iio_device_unregister(iio);
- mxs_lradc_ts_unregister(lradc);
- mxs_lradc_hw_stop(lradc);
- mxs_lradc_trigger_remove(iio);
- iio_triggered_buffer_cleanup(iio);
-
- clk_disable_unprepare(lradc->clk);
-
- return 0;
-}
-
-static struct platform_driver mxs_lradc_driver = {
- .driver = {
- .name = DRIVER_NAME,
- .of_match_table = mxs_lradc_dt_ids,
- },
- .probe = mxs_lradc_probe,
- .remove = mxs_lradc_remove,
-};
-
-module_platform_driver(mxs_lradc_driver);
-
-MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
-MODULE_DESCRIPTION("Freescale MXS LRADC driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" DRIVER_NAME);
--
1.9.1
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD
2016-06-08 14:45 ` [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
@ 2016-06-11 15:32 ` Jonathan Cameron
2016-06-15 21:17 ` Stefan Wahren
1 sibling, 0 replies; 11+ messages in thread
From: Jonathan Cameron @ 2016-06-11 15:32 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, knaack.h, lars, pmeerw,
marex, linux-iio, harald, stefan.wahren, fabio.estevam
On 08/06/16 15:45, Ksenija Stanojevic wrote:
> Add core files for mxs-lradc MFD driver.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> ---
One really minor point inline that would make for a slighlty more
'obviously correct' driver. I haven't absolutely established there
isn't a race (which not using the devm form of the device add
would have made obvious), but I think you are probably fine anyway.
Otherwise, looking nice to me.
Acked-by: Jonathan Cameron <jic23@kernel.org>
> Changes in v2:
> - do not change spacing in Kconfig
> - make struct mfd_cell part of struct mxs_lradc
> - use switch instead of if in mxs_lradc_irq_mask
> - use only necessary header files in mxs_lradc.h
> - use devm_mfd_add_device
> - use separate function to register mfd device
> - change licence to GPL
> - add copyright
>
> drivers/mfd/Kconfig | 17 ++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/mxs-lradc.c | 215 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/mxs-lradc.h | 204 +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 437 insertions(+)
> create mode 100644 drivers/mfd/mxs-lradc.c
> create mode 100644 include/linux/mfd/mxs-lradc.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9ca66de..62593ad 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -271,6 +271,23 @@ config MFD_MC13XXX_I2C
> help
> Select this if your MC13xxx is connected via an I2C bus.
>
> +config MFD_MXS_LRADC
> + tristate "Freescale i.MX23/i.MX28 LRADC"
> + depends on ARCH_MXS || COMPILE_TEST
> + select MFD_CORE
> + select STMP_DEVICE
> + help
> + Say yes here to build support for the low-resolution
> + analog-to-digital converter (LRADC) found on the i.MX23 and i.MX28
> + processors. This driver provides common support for accessing the
> + device, additional drivers must be enabled in order to use the
> + functionality of the device:
> + mxs-lradc-adc for ADC readings
> + mxs-lradc-ts for touchscreen support
> +
> + This driver can also be built as a module. If so, the module will be
> + called mxs-lradc.
> +
> config MFD_HI6421_PMIC
> tristate "HiSilicon Hi6421 PMU/Codec IC"
> depends on OF
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 0f230a6..ecf6399 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -198,3 +198,4 @@ intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
> intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC) += intel_soc_pmic_bxtwc.o
> obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
> obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
> +obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
> diff --git a/drivers/mfd/mxs-lradc.c b/drivers/mfd/mxs-lradc.c
> new file mode 100644
> index 0000000..5e894bb
> --- /dev/null
> +++ b/drivers/mfd/mxs-lradc.c
> @@ -0,0 +1,215 @@
> +/*
> + * Freescale MXS LRADC driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@denx.de>
> + * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/mxs-lradc.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +static const char * const mx23_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> +};
> +
> +static const char * const mx28_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-thresh0",
> + "mxs-lradc-thresh1",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> + "mxs-lradc-button0",
> + "mxs-lradc-button1",
> +};
> +
> +struct mxs_lradc_of_config {
> + const int irq_count;
> + const char * const *irq_name;
> +};
> +
> +static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> + [IMX23_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> + .irq_name = mx23_lradc_irq_names,
> + },
> + [IMX28_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> + .irq_name = mx28_lradc_irq_names,
> + },
> +};
> +
> +static const struct of_device_id mxs_lradc_dt_ids[] = {
> + { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> + { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> +
> +static int mxs_lradc_add_device(struct platform_device *pdev,
> + struct mxs_lradc *lradc, char *name, int i)
> +{
> + struct mfd_cell *cell;
> +
> + cell = &lradc->cells[i];
> + cell->name = name;
> + cell->platform_data = lradc;
> + cell->pdata_size = sizeof(*lradc);
> +
> + return devm_mfd_add_devices(&pdev->dev, -1, cell, 1, NULL, 0, NULL);
> +}
> +
> +static int mxs_lradc_probe(struct platform_device *pdev)
> +{
> + const struct of_device_id *of_id =
> + of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> + const struct mxs_lradc_of_config *of_cfg =
> + &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct mxs_lradc *lradc;
> + struct resource *iores;
> + int ret = 0, touch_ret, i;
> + u32 ts_wires = 0;
> +
> + lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
> + if (!lradc)
> + return -ENOMEM;
> + lradc->soc = (enum mxs_lradc_id)of_id->data;
> +
> + /* Grab the memory area */
> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + lradc->base = devm_ioremap_resource(dev, iores);
> + if (IS_ERR(lradc->base))
> + return PTR_ERR(lradc->base);
> +
> + lradc->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(lradc->clk)) {
> + dev_err(dev, "Failed to get the delay unit clock\n");
> + return PTR_ERR(lradc->clk);
> + }
> + ret = clk_prepare_enable(lradc->clk);
> + if (ret != 0) {
> + dev_err(dev, "Failed to enable the delay unit clock\n");
> + return ret;
> + }
> +
> + touch_ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
> + &ts_wires);
> +
> + if (touch_ret == 0)
> + lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> + else
> + lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> +
> + lradc->irq_count = of_cfg->irq_count;
> + lradc->irq_name = of_cfg->irq_name;
> + for (i = 0; i < lradc->irq_count; i++) {
> + lradc->irq[i] = platform_get_irq(pdev, i);
> + if (lradc->irq[i] < 0) {
> + ret = lradc->irq[i];
> + goto err_clk;
> + }
> + }
> +
> + platform_set_drvdata(pdev, lradc);
> +
> + ret = stmp_reset_block(lradc->base);
> + if (ret)
> + return ret;
> +
> + switch (ts_wires) {
> + case 4:
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> + break;
> + case 5:
> + if (lradc->soc == IMX28_LRADC) {
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> + break;
> + }
> + /* fall through an error message for i.MX23 */
> + default:
> + dev_err(&pdev->dev,
> + "Unsupported number of touchscreen wires (%d)\n",
> + ts_wires);
> + return -EINVAL;
> + }
> +
> + ret = mxs_lradc_add_device(pdev, lradc, DRIVER_NAME_ADC, 0);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
> + goto err_clk;
> + }
> +
> + if (!lradc->use_touchscreen)
> + return 0;
> +
> + ret = mxs_lradc_add_device(pdev, lradc, DRIVER_NAME_TS, 1);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "Failed to add the touchscreen subdevice\n");
> + goto err_clk;
> + }
> +
> + return 0;
> +
> +err_clk:
> + clk_disable_unprepare(lradc->clk);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_remove(struct platform_device *pdev)
> +{
> + struct mxs_lradc *lradc = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(lradc->clk);
A possible slight issue with the interaction of this and
devm_mfd_add_devices. The add devices will unwind after this. It shouldn't
cause trouble I think, but breaks the 'obviously correct' 'rule'.
> +
> + return 0;
> +}
> +
> +static struct platform_driver mxs_lradc_driver = {
> + .driver = {
> + .name = "mxs-lradc",
> + .of_match_table = mxs_lradc_dt_ids,
> + },
> + .probe = mxs_lradc_probe,
> + .remove = mxs_lradc_remove,
> +};
> +
> +module_platform_driver(mxs_lradc_driver);
> +
> +MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:mxs-lradc");
> diff --git a/include/linux/mfd/mxs-lradc.h b/include/linux/mfd/mxs-lradc.h
> new file mode 100644
> index 0000000..c1475c0
> --- /dev/null
> +++ b/include/linux/mfd/mxs-lradc.h
> @@ -0,0 +1,204 @@
> +/*
> + * Freescale MXS LRADC driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@denx.de>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __MXS_LRADC_H
> +#define __MXS_LRADC_H
> +
> +#include <linux/bitops.h>
> +#include <linux/io.h>
> +#include <linux/stmp_device.h>
> +
> +#define DRIVER_NAME_ADC "mxs-lradc-adc"
> +#define DRIVER_NAME_TS "mxs-lradc-ts"
> +
> +#define LRADC_MAX_DELAY_CHANS 4
> +#define LRADC_MAX_MAPPED_CHANS 8
> +#define LRADC_MAX_TOTAL_CHANS 16
> +
> +#define LRADC_DELAY_TIMER_HZ 2000
> +
> +#define LRADC_CTRL0 0x00
> +# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
> +# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
> +# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
> +# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
> +# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
> +# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
> +# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
> +# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
> +
> +# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
> +# define LRADC_CTRL0_MX23_YM BIT(19)
> +# define LRADC_CTRL0_MX23_XM BIT(18)
> +# define LRADC_CTRL0_MX23_YP BIT(17)
> +# define LRADC_CTRL0_MX23_XP BIT(16)
> +
> +# define LRADC_CTRL0_MX28_PLATE_MASK \
> + (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
> + LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
> + LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
> + LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
> +
> +# define LRADC_CTRL0_MX23_PLATE_MASK \
> + (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
> + LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
> + LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
> +
> +#define LRADC_CTRL1 0x10
> +#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
> +#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
> +#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
> +#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
> +#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> +#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
> +
> +#define LRADC_CTRL2 0x20
> +#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
> +#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
> +
> +#define LRADC_STATUS 0x40
> +#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
> +
> +#define LRADC_CH(n) (0x50 + (0x10 * (n)))
> +#define LRADC_CH_ACCUMULATE BIT(29)
> +#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
> +#define LRADC_CH_NUM_SAMPLES_OFFSET 24
> +#define LRADC_CH_NUM_SAMPLES(x) \
> + ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
> +#define LRADC_CH_VALUE_MASK 0x3ffff
> +#define LRADC_CH_VALUE_OFFSET 0
> +
> +#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
> +#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
> +#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
> +#define LRADC_DELAY_TRIGGER(x) \
> + (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
> + LRADC_DELAY_TRIGGER_LRADCS_MASK)
> +#define LRADC_DELAY_KICK BIT(20)
> +#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
> +#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
> +#define LRADC_DELAY_TRIGGER_DELAYS(x) \
> + (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
> + LRADC_DELAY_TRIGGER_DELAYS_MASK)
> +#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
> +#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
> +#define LRADC_DELAY_LOOP(x) \
> + (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
> + LRADC_DELAY_LOOP_COUNT_MASK)
> +#define LRADC_DELAY_DELAY_MASK 0x7ff
> +#define LRADC_DELAY_DELAY_OFFSET 0
> +#define LRADC_DELAY_DELAY(x) \
> + (((x) << LRADC_DELAY_DELAY_OFFSET) & \
> + LRADC_DELAY_DELAY_MASK)
> +
> +#define LRADC_CTRL4 0x140
> +#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
> +#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
> +#define LRADC_CTRL4_LRADCSELECT(n, x) \
> + (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
> + LRADC_CTRL4_LRADCSELECT_MASK(n))
> +
> +#define LRADC_RESOLUTION 12
> +#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
> +
> +enum mxs_lradc_id {
> + IMX23_LRADC,
> + IMX28_LRADC,
> +};
> +
> +enum mxs_lradc_ts_wires {
> + MXS_LRADC_TOUCHSCREEN_NONE = 0,
> + MXS_LRADC_TOUCHSCREEN_4WIRE,
> + MXS_LRADC_TOUCHSCREEN_5WIRE,
> +};
> +
> +struct mxs_lradc {
> + enum mxs_lradc_id soc;
> +
> + void __iomem *base;
> + struct clk *clk;
> +
> + int irq[13];
> + const char * const *irq_name;
> + int irq_count;
> +
> +#define BUFFER_VCHANS_LIMITED 0x3f
> +#define BUFFER_VCHANS_ALL 0xff
> + u8 buffer_vchans;
> +
> + /*
> + * Certain LRADC channels are shared between touchscreen
> + * and/or touch-buttons and generic LRADC block. Therefore when using
> + * either of these, these channels are not available for the regular
> + * sampling. The shared channels are as follows:
> + *
> + * CH0 -- Touch button #0
> + * CH1 -- Touch button #1
> + * CH2 -- Touch screen XPUL
> + * CH3 -- Touch screen YPLL
> + * CH4 -- Touch screen XNUL
> + * CH5 -- Touch screen YNLR
> + * CH6 -- Touch screen WIPER (5-wire only)
> + *
> + * The bit fields below represents which parts of the LRADC block are
> + * switched into special mode of operation. These channels can not
> + * be sampled as regular LRADC channels. The driver will refuse any
> + * attempt to sample these channels.
> + */
> +#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
> +#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
> +#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
> + enum mxs_lradc_ts_wires use_touchscreen;
> + bool use_touchbutton;
> +
> +#define MXS_LRADC_CELLS 2
> + struct mfd_cell cells[MXS_LRADC_CELLS];
> +};
> +
> +static inline void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
> +}
> +
> +static inline void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val,
> + u32 reg)
> +{
> + writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
> +}
> +
> +static inline void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
> +{
> + writel(val, lradc->base + reg);
> +}
> +
> +static inline u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
> +{
> + switch (lradc->soc) {
> + case IMX23_LRADC:
> + return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
> + case IMX28_LRADC:
> + return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
> + default:
> + return 0;
> + }
> +}
> +
> +#endif /* __MXS_LRADC_H */
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2 2/4] iio: adc: mxs-lradc: Add support for adc driver
2016-06-08 14:47 ` [PATCH v2 2/4] iio: adc: mxs-lradc: Add support for adc driver Ksenija Stanojevic
@ 2016-06-11 15:48 ` Jonathan Cameron
0 siblings, 0 replies; 11+ messages in thread
From: Jonathan Cameron @ 2016-06-11 15:48 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, knaack.h, lars, pmeerw,
marex, linux-iio, harald, stefan.wahren, fabio.estevam
On 08/06/16 15:47, Ksenija Stanojevic wrote:
> Add support for sixteen-channel 12-bit resolution ADC and its functions,
> which include general-purpose ADC readings, battery voltage measurement,
> and die temperature measurement.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Some really trivial white space comments inline...
+ I think you need to add 2 to the number of elements in your buffer array.
Fix that and you can add
Acked-by: Jonathan Cameron <jic23@kernel.org>
> ---
> Changes in v2:
> - improve commit message
> - do not change spacing in Kconfig
> - impove formating
> - remove wrapper show_scale_avail
> - use correct syntax for comments
> - use devm_iio_trigger_alloc
> - do not allocate buffer dynamically
> - use iio_device_claim_*_mode helpers
> - add spinlock in struct mxs_lradc_ts to enable locking in interrupt handler
> - only grab irqs that are relevant to adc
> - remove blank line at the end of the file
> - change licence to GPL
> - add copyright
>
> drivers/iio/adc/Kconfig | 13 +
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/mxs-lradc-adc.c | 813 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 827 insertions(+)
> create mode 100644 drivers/iio/adc/mxs-lradc-adc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 932de1f..4ef3ad1 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -194,6 +194,19 @@ config EXYNOS_ADC
> To compile this driver as a module, choose M here: the module will be
> called exynos_adc.
>
> +config MXS_LRADC_ADC
> + tristate "Freescale i.MX23/i.MX28 LRADC ADC"
> + depends on MFD_MXS_LRADC
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + help
> + Say yes here to build support for the ADC functions of the
> + i.MX23/i.MX28 LRADC. This includes general-purpose ADC readings,
> + battery voltage measurement, and die temperature measurement.
> +
> + This driver can also be built as a module. If so, the module will be
> + called mxs-lradc-adc.
> +
> config HI8435
> tristate "Holt Integrated Circuits HI-8435 threshold detector"
> select IIO_TRIGGERED_EVENT
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index b1aa456..9bb35c4 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -29,6 +29,7 @@ obj-$(CONFIG_MAX1363) += max1363.o
> obj-$(CONFIG_MCP320X) += mcp320x.o
> obj-$(CONFIG_MCP3422) += mcp3422.o
> obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
> +obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
> obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
> obj-$(CONFIG_NAU7802) += nau7802.o
> obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
> diff --git a/drivers/iio/adc/mxs-lradc-adc.c b/drivers/iio/adc/mxs-lradc-adc.c
> new file mode 100644
> index 0000000..3b00bc0
> --- /dev/null
> +++ b/drivers/iio/adc/mxs-lradc-adc.c
> @@ -0,0 +1,813 @@
> +/*
> + * Freescale MXS LRADC ADC driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@denx.de>
> + * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/completion.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/mxs-lradc.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/sysfs.h>
> +
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/sysfs.h>
> +
> +/*
> + * Make this runtime configurable if necessary. Currently, if the buffered mode
> + * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
> + * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
> + * seconds. The result is that the samples arrive every 500mS.
> + */
> +#define LRADC_DELAY_TIMER_PER 200
> +#define LRADC_DELAY_TIMER_LOOP 5
> +
> +#define VREF_MV_BASE 1850
> +
> +#define IMX23_NUM_IRQ 6
> +#define IMX28_NUM_IRQ 10
> +
> +static const int mx23_lradc_adc_irq[] = {1, 2, 3, 4, 5, 6};
> +static const int mx28_lradc_adc_irq[] = {1, 2, 3, 4, 5, 6, 7, 8, 11, 12};
> +
> +static const u32 mxs_lradc_adc_vref_mv[][LRADC_MAX_TOTAL_CHANS] = {
> + [IMX23_LRADC] = {
> + VREF_MV_BASE, /* CH0 */
> + VREF_MV_BASE, /* CH1 */
> + VREF_MV_BASE, /* CH2 */
> + VREF_MV_BASE, /* CH3 */
> + VREF_MV_BASE, /* CH4 */
> + VREF_MV_BASE, /* CH5 */
> + VREF_MV_BASE * 2, /* CH6 VDDIO */
> + VREF_MV_BASE * 4, /* CH7 VBATT */
> + VREF_MV_BASE, /* CH8 Temp sense 0 */
> + VREF_MV_BASE, /* CH9 Temp sense 1 */
> + VREF_MV_BASE, /* CH10 */
> + VREF_MV_BASE, /* CH11 */
> + VREF_MV_BASE, /* CH12 USB_DP */
> + VREF_MV_BASE, /* CH13 USB_DN */
> + VREF_MV_BASE, /* CH14 VBG */
> + VREF_MV_BASE * 4, /* CH15 VDD5V */
> + },
> + [IMX28_LRADC] = {
> + VREF_MV_BASE, /* CH0 */
> + VREF_MV_BASE, /* CH1 */
> + VREF_MV_BASE, /* CH2 */
> + VREF_MV_BASE, /* CH3 */
> + VREF_MV_BASE, /* CH4 */
> + VREF_MV_BASE, /* CH5 */
> + VREF_MV_BASE, /* CH6 */
> + VREF_MV_BASE * 4, /* CH7 VBATT */
> + VREF_MV_BASE, /* CH8 Temp sense 0 */
> + VREF_MV_BASE, /* CH9 Temp sense 1 */
> + VREF_MV_BASE * 2, /* CH10 VDDIO */
> + VREF_MV_BASE, /* CH11 VTH */
> + VREF_MV_BASE * 2, /* CH12 VDDA */
> + VREF_MV_BASE, /* CH13 VDDD */
> + VREF_MV_BASE, /* CH14 VBG */
> + VREF_MV_BASE * 4, /* CH15 VDD5V */
> + },
> +};
> +
> +enum mxs_lradc_divbytwo {
> + MXS_LRADC_DIV_DISABLED = 0,
> + MXS_LRADC_DIV_ENABLED,
> +};
> +
> +struct mxs_lradc_scale {
> + unsigned int integer;
> + unsigned int nano;
> +};
> +
> +struct mxs_lradc_adc {
> + struct mxs_lradc *lradc;
> + struct device *dev;
> +
> + u32 buffer[8];
Is this big enough? Check the docs for iio_push_to_buffers_with_timestamp
(need space for the timestamp as well as the channels).
So I think it should be buffer[10];
> + struct iio_trigger *trig;
> + struct completion completion;
> + spinlock_t lock;
> +
> + const u32 *vref_mv;
> + struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
> + unsigned long is_divided;
> +};
> +
> +
> +/* Raw I/O operations */
> +static int mxs_lradc_adc_read_single(struct iio_dev *iio_dev, int chan,
> + int *val)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio_dev);
> + struct mxs_lradc *lradc = adc->lradc;
> + int ret;
> +
> + /*
> + * See if there is no buffered operation in progress. If there is simply
> + * bail out. This can be improved to support both buffered and raw IO at
> + * the same time, yet the code becomes horribly complicated. Therefore I
> + * applied KISS principle here.
> + */
> + ret = iio_device_claim_direct_mode(iio_dev);
> + if (ret)
> + return ret;
> +
> + reinit_completion(&adc->completion);
> +
> + /*
> + * No buffered operation in progress, map the channel and trigger it.
> + * Virtual channel 0 is always used here as the others are always not
> + * used if doing raw sampling.
> + */
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
> + LRADC_CTRL1);
> + mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
> +
> + /* Enable / disable the divider per requirement */
> + if (test_bit(chan, &adc->is_divided))
> + mxs_lradc_reg_set(lradc,
> + 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> + LRADC_CTRL2);
> + else
> + mxs_lradc_reg_clear(lradc,
> + 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> + LRADC_CTRL2);
> +
> + /* Clean the slot's previous content, then set new one. */
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
> + LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
> +
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
> +
> + /* Enable the IRQ and start sampling the channel. */
> + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
> +
> + /* Wait for completion on the channel, 1 second max. */
> + ret = wait_for_completion_killable_timeout(&adc->completion, HZ);
> + if (!ret)
> + ret = -ETIMEDOUT;
> + if (ret < 0)
> + goto err;
> +
> + /* Read the data. */
> + *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
> + ret = IIO_VAL_INT;
> +
> +err:
> + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> +
> + iio_device_release_direct_mode(iio_dev);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_adc_read_temp(struct iio_dev *iio_dev, int *val)
> +{
> + int ret, min, max;
> +
> + ret = mxs_lradc_adc_read_single(iio_dev, 8, &min);
> + if (ret != IIO_VAL_INT)
> + return ret;
> +
> + ret = mxs_lradc_adc_read_single(iio_dev, 9, &max);
> + if (ret != IIO_VAL_INT)
> + return ret;
> +
> + *val = max - min;
> +
> + return IIO_VAL_INT;
> +}
> +
> +static int mxs_lradc_adc_read_raw(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + int *val, int *val2, long m)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio_dev);
> +
> + switch (m) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type == IIO_TEMP)
> + return mxs_lradc_adc_read_temp(iio_dev, val);
> +
> + return mxs_lradc_adc_read_single(iio_dev, chan->channel, val);
> +
> + case IIO_CHAN_INFO_SCALE:
> + if (chan->type == IIO_TEMP) {
> + /*
> + * From the datasheet, we have to multiply by 1.012 and
> + * divide by 4
> + */
> + *val = 0;
> + *val2 = 253000;
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + *val = adc->vref_mv[chan->channel];
> + *val2 = chan->scan_type.realbits -
> + test_bit(chan->channel, &adc->is_divided);
> + return IIO_VAL_FRACTIONAL_LOG2;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + if (chan->type == IIO_TEMP) {
> + /*
> + * The calculated value from the ADC is in Kelvin, we
> + * want Celsius for hwmon so the offset is -273.15
> + * The offset is applied before scaling so it is
> + * actually -213.15 * 4 / 1.012 = -1079.644268
> + */
> + *val = -1079;
> + *val2 = 644268;
> +
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> +
> + return -EINVAL;
> +
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int mxs_lradc_adc_write_raw(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + int val, int val2, long m)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio_dev);
> + struct mxs_lradc_scale *scale_avail =
> + adc->scale_avail[chan->channel];
> + int ret;
> +
> + ret = iio_device_claim_direct_mode(iio_dev);
> + if (ret)
> + return ret;
> +
> + switch (m) {
> + case IIO_CHAN_INFO_SCALE:
> + ret = -EINVAL;
> + if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
> + val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
> + /* divider by two disabled */
> + clear_bit(chan->channel, &adc->is_divided);
> + ret = 0;
> + } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
> + val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
> + /* divider by two enabled */
> + set_bit(chan->channel, &adc->is_divided);
> + ret = 0;
> + }
> +
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + iio_device_release_direct_mode(iio_dev);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_adc_write_raw_get_fmt(struct iio_dev *iio_dev,
> + const struct iio_chan_spec *chan,
> + long m)
> +{
> + return IIO_VAL_INT_PLUS_NANO;
> +}
> +
> +static ssize_t mxs_lradc_adc_show_scale_avail(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *iio = dev_to_iio_dev(dev);
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
> + int i, ch, len = 0;
> +
> + ch = iio_attr->address;
> + for (i = 0; i < ARRAY_SIZE(adc->scale_avail[ch]); i++)
> + len += sprintf(buf + len, "%u.%09u ",
> + adc->scale_avail[ch][i].integer,
> + adc->scale_avail[ch][i].nano);
> +
> + len += sprintf(buf + len, "\n");
> +
> + return len;
> +}
> +
> +#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
> +static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
> + mxs_lradc_adc_show_scale_avail, NULL, ch)
> +
> +SHOW_SCALE_AVAILABLE_ATTR(0);
> +SHOW_SCALE_AVAILABLE_ATTR(1);
> +SHOW_SCALE_AVAILABLE_ATTR(2);
> +SHOW_SCALE_AVAILABLE_ATTR(3);
> +SHOW_SCALE_AVAILABLE_ATTR(4);
> +SHOW_SCALE_AVAILABLE_ATTR(5);
> +SHOW_SCALE_AVAILABLE_ATTR(6);
> +SHOW_SCALE_AVAILABLE_ATTR(7);
> +SHOW_SCALE_AVAILABLE_ATTR(10);
> +SHOW_SCALE_AVAILABLE_ATTR(11);
> +SHOW_SCALE_AVAILABLE_ATTR(12);
> +SHOW_SCALE_AVAILABLE_ATTR(13);
> +SHOW_SCALE_AVAILABLE_ATTR(14);
> +SHOW_SCALE_AVAILABLE_ATTR(15);
> +
> +static struct attribute *mxs_lradc_adc_attributes[] = {
> + &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
> + &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group mxs_lradc_adc_attribute_group = {
> + .attrs = mxs_lradc_adc_attributes,
> +};
> +
> +static const struct iio_info mxs_lradc_adc_iio_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = mxs_lradc_adc_read_raw,
> + .write_raw = mxs_lradc_adc_write_raw,
> + .write_raw_get_fmt = mxs_lradc_adc_write_raw_get_fmt,
> + .attrs = &mxs_lradc_adc_attribute_group,
> +};
> +
> +
one blank line only preferered.
> +/* IRQ Handling */
> +static irqreturn_t mxs_lradc_adc_handle_irq(int irq, void *data)
> +{
> + struct iio_dev *iio = data;
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + struct mxs_lradc *lradc = adc->lradc;
> + unsigned long reg = readl(lradc->base + LRADC_CTRL1);
> + unsigned long flags;
> +
> + if (!(reg & mxs_lradc_irq_mask(lradc)))
> + return IRQ_NONE;
> +
> + if (iio_buffer_enabled(iio)) {
> + if (reg & lradc->buffer_vchans) {
> + spin_lock_irqsave(&adc->lock, flags);
> + iio_trigger_poll(iio->trig);
> + spin_unlock_irqrestore(&adc->lock, flags);
> + }
> + } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
> + complete(&adc->completion);
> + }
> +
> + mxs_lradc_reg_clear(lradc, reg & mxs_lradc_irq_mask(lradc),
> + LRADC_CTRL1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +
> +/* Trigger handling */
> +static irqreturn_t mxs_lradc_adc_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *iio = pf->indio_dev;
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + const u32 chan_value = LRADC_CH_ACCUMULATE |
> + ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> + unsigned int i, j = 0;
> +
> + for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> + adc->buffer[j] = readl(adc->lradc->base + LRADC_CH(j));
> + mxs_lradc_reg_wrt(adc->lradc, chan_value, LRADC_CH(j));
> + adc->buffer[j] &= LRADC_CH_VALUE_MASK;
> + adc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
> + j++;
> + }
> +
> + iio_push_to_buffers_with_timestamp(iio, adc->buffer, pf->timestamp);
> +
> + iio_trigger_notify_done(iio->trig);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int mxs_lradc_adc_configure_trigger(struct iio_trigger *trig, bool state)
> +{
> + struct iio_dev *iio = iio_trigger_get_drvdata(trig);
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
> +
> + mxs_lradc_reg_wrt(adc->lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
> +
> + return 0;
> +}
> +
> +static const struct iio_trigger_ops mxs_lradc_adc_trigger_ops = {
> + .owner = THIS_MODULE,
> + .set_trigger_state = &mxs_lradc_adc_configure_trigger,
> +};
> +
> +static int mxs_lradc_adc_trigger_init(struct iio_dev *iio)
> +{
> + int ret;
> + struct iio_trigger *trig;
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> +
> + trig = devm_iio_trigger_alloc(&iio->dev, "%s-dev%i", iio->name,
> + iio->id);
> +
> + trig->dev.parent = adc->dev;
> + iio_trigger_set_drvdata(trig, iio);
> + trig->ops = &mxs_lradc_adc_trigger_ops;
> +
> + ret = iio_trigger_register(trig);
> + if (ret)
> + return ret;
> +
> + adc->trig = trig;
> +
> + return 0;
> +}
> +
> +static void mxs_lradc_adc_trigger_remove(struct iio_dev *iio)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> +
> + iio_trigger_unregister(adc->trig);
> +}
> +
> +static int mxs_lradc_adc_buffer_preenable(struct iio_dev *iio)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + struct mxs_lradc *lradc = adc->lradc;
> + int chan, ofs = 0;
> + unsigned long enable = 0;
> + u32 ctrl4_set = 0;
> + u32 ctrl4_clr = 0;
> + u32 ctrl1_irq = 0;
> + const u32 chan_value = LRADC_CH_ACCUMULATE |
> + ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> +
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(lradc,
> + lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + LRADC_CTRL1);
> + mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> +
> + for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> + ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
> + ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
> + ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
> + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
> + bitmap_set(&enable, ofs, 1);
> + ofs++;
> + }
> +
> + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> + LRADC_DELAY_KICK, LRADC_DELAY(0));
> + mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
> + mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
> + mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
> + LRADC_DELAY(0));
> +
> + return 0;
> +}
> +
> +static int mxs_lradc_adc_buffer_postdisable(struct iio_dev *iio)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + struct mxs_lradc *lradc = adc->lradc;
> +
> + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> + LRADC_DELAY_KICK, LRADC_DELAY(0));
> +
> + mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> + if (lradc->soc == IMX28_LRADC)
> + mxs_lradc_reg_clear(lradc,
> + lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + LRADC_CTRL1);
> +
> + return 0;
> +}
> +
> +static bool mxs_lradc_adc_validate_scan_mask(struct iio_dev *iio,
> + const unsigned long *mask)
> +{
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> + struct mxs_lradc *lradc = adc->lradc;
> + const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
> + int rsvd_chans = 0;
> + unsigned long rsvd_mask = 0;
> +
> + if (lradc->use_touchbutton)
> + rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
> + rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
> + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> + rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
> +
> + if (lradc->use_touchbutton)
> + rsvd_chans++;
> + if (lradc->use_touchscreen)
> + rsvd_chans += 2;
> +
> + /* Test for attempts to map channels with special mode of operation. */
> + if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
> + return false;
> +
> + /* Test for attempts to map more channels then available slots. */
> + if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
> + return false;
> +
> + return true;
> +}
> +
> +static const struct iio_buffer_setup_ops mxs_lradc_adc_buffer_ops = {
> + .preenable = &mxs_lradc_adc_buffer_preenable,
> + .postenable = &iio_triggered_buffer_postenable,
> + .predisable = &iio_triggered_buffer_predisable,
> + .postdisable = &mxs_lradc_adc_buffer_postdisable,
> + .validate_scan_mask = &mxs_lradc_adc_validate_scan_mask,
> +};
> +
> +/* Driver initialization */
> +#define MXS_ADC_CHAN(idx, chan_type, name) { \
> + .type = (chan_type), \
> + .indexed = 1, \
> + .scan_index = (idx), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .channel = (idx), \
> + .address = (idx), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = LRADC_RESOLUTION, \
> + .storagebits = 32, \
> + }, \
> + .datasheet_name = (name), \
> +}
> +
> +static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
> + MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> + MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> + MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> + MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> + MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> + MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> + MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
> + MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> + /* Combined Temperature sensors */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = 8,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + .channel = 8,
> + .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> + .datasheet_name = "TEMP_DIE",
> + },
> + /* Hidden channel to keep indexes */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = -1,
> + .channel = 9,
> + },
> + MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
> + MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
> + MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
> + MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
> + MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> + MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> +};
> +
> +static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
> + MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> + MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> + MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> + MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> + MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> + MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> + MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
> + MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> + /* Combined Temperature sensors */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = 8,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + .channel = 8,
> + .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> + .datasheet_name = "TEMP_DIE",
> + },
> + /* Hidden channel to keep indexes */
> + {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .scan_index = -1,
> + .channel = 9,
> + },
> + MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
> + MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
> + MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
> + MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
> + MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> + MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> +};
> +
> +static void mxs_lradc_adc_hw_init(struct mxs_lradc_adc *adc)
> +{
> + struct mxs_lradc *lradc = adc->lradc;
> +
> + /* The ADC always uses DELAY CHANNEL 0. */
> + const u32 adc_cfg =
> + (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
> + (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
> +
> + /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
> + mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
> +
> + /*
> + * Start internal temperature sensing by clearing bit
> + * HW_LRADC_CTRL2_TEMPSENSE_PWD. This bit can be left cleared
> + * after power up.
> + */
> + mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
> +}
> +
> +static void mxs_lradc_adc_hw_stop(struct mxs_lradc_adc *adc)
> +{
> + mxs_lradc_reg_wrt(adc->lradc, 0, LRADC_DELAY(0));
> +}
> +
> +static int mxs_lradc_adc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct mxs_lradc *lradc = dev_get_platdata(dev);
> + struct mxs_lradc_adc *adc;
> + struct iio_dev *iio;
> + int ret, i, j, s, n;
> + u64 scale_uv;
> + const int *irq;
> +
> +
One blank line only prefered.
> + /* Allocate the IIO device. */
> + iio = devm_iio_device_alloc(dev, sizeof(*adc));
> + if (!iio) {
> + dev_err(dev, "Failed to allocate IIO device\n");
> + return -ENOMEM;
> + }
> +
> + adc = iio_priv(iio);
> + adc->lradc = lradc;
> + adc->dev = dev;
> +
> + init_completion(&adc->completion);
> + spin_lock_init(&adc->lock);
> +
> + platform_set_drvdata(pdev, iio);
> +
> + iio->name = pdev->name;
> + iio->dev.parent = dev;
> + iio->dev.of_node = dev->parent->of_node;
> + iio->info = &mxs_lradc_adc_iio_info;
> + iio->modes = INDIO_DIRECT_MODE;
> + iio->masklength = LRADC_MAX_TOTAL_CHANS;
> +
> + if (lradc->soc == IMX23_LRADC) {
> + iio->channels = mx23_lradc_chan_spec;
> + iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
> + irq = mx23_lradc_adc_irq;
> + n = IMX23_NUM_IRQ;
> + } else {
> + iio->channels = mx28_lradc_chan_spec;
> + iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
> + irq = mx28_lradc_adc_irq;
> + n = IMX28_NUM_IRQ;
> + }
> +
> + for (i = 0; i < n; i++) {
> + j = irq[i];
> + ret = devm_request_irq(dev, lradc->irq[j],
> + mxs_lradc_adc_handle_irq,
> + 0, lradc->irq_name[j], iio);
> + if (ret)
> + return ret;
> + }
> +
> + ret = mxs_lradc_adc_trigger_init(iio);
> + if (ret)
> + goto err_trig;
> +
> + ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
> + &mxs_lradc_adc_trigger_handler,
> + &mxs_lradc_adc_buffer_ops);
> + if (ret)
> + return ret;
> +
> + adc->vref_mv = mxs_lradc_adc_vref_mv[lradc->soc];
> +
> + /* Populate available ADC input ranges */
> + for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
> + for (s = 0; s < ARRAY_SIZE(adc->scale_avail[i]); s++) {
> + /*
> + * [s=0] = optional divider by two disabled (default)
> + * [s=1] = optional divider by two enabled
> + *
> + * The scale is calculated by doing:
> + * Vref >> (realbits - s)
> + * which multiplies by two on the second component
> + * of the array.
> + */
> + scale_uv = ((u64)adc->vref_mv[i] * 100000000) >>
> + (LRADC_RESOLUTION - s);
> + adc->scale_avail[i][s].nano =
> + do_div(scale_uv, 100000000) * 10;
> + adc->scale_avail[i][s].integer = scale_uv;
> + }
> + }
> +
> + /* Configure the hardware. */
> + mxs_lradc_adc_hw_init(adc);
> +
> + /* Register IIO device. */
> + ret = iio_device_register(iio);
> + if (ret) {
> + dev_err(dev, "Failed to register IIO device\n");
> + goto err_dev;
> + }
> +
> + return 0;
> +
> +err_dev:
> + mxs_lradc_adc_hw_stop(adc);
> + mxs_lradc_adc_trigger_remove(iio);
> +err_trig:
> + iio_triggered_buffer_cleanup(iio);
> + return ret;
> +}
> +
> +static int mxs_lradc_adc_remove(struct platform_device *pdev)
> +{
> + struct iio_dev *iio = platform_get_drvdata(pdev);
> + struct mxs_lradc_adc *adc = iio_priv(iio);
> +
> + iio_device_unregister(iio);
> + mxs_lradc_adc_hw_stop(adc);
> + mxs_lradc_adc_trigger_remove(iio);
> + iio_triggered_buffer_cleanup(iio);
> +
> + return 0;
> +}
> +
> +static struct platform_driver mxs_lradc_adc_driver = {
> + .driver = {
> + .name = DRIVER_NAME_ADC,
> + },
> + .probe = mxs_lradc_adc_probe,
> + .remove = mxs_lradc_adc_remove,
> +};
> +
> +module_platform_driver(mxs_lradc_adc_driver);
> +
> +MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
> +MODULE_DESCRIPTION("Freescale MXS LRADC driver general purpose ADC driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" DRIVER_NAME_ADC);
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2 4/4] iio: adc: mxs-lradc: Remove driver
2016-06-08 14:49 ` [PATCH v2 4/4] iio: adc: mxs-lradc: Remove driver Ksenija Stanojevic
@ 2016-06-11 15:50 ` Jonathan Cameron
0 siblings, 0 replies; 11+ messages in thread
From: Jonathan Cameron @ 2016-06-11 15:50 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, knaack.h, lars, pmeerw,
marex, linux-iio, harald, stefan.wahren, fabio.estevam
On 08/06/16 15:49, Ksenija Stanojevic wrote:
> Since the driver has been split into mfd there is no reason for it to
> stay, so remove it.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
This whole set will presumably go through the mfd tree once everyone is
happy.
Thanks,
Jonathan
> ---
> Changes in v2:
> - none
>
> drivers/iio/adc/Kconfig | 14 -
> drivers/iio/adc/Makefile | 1 -
> drivers/iio/adc/mxs-lradc.c | 1775 -------------------------------------------
> 3 files changed, 1790 deletions(-)
> delete mode 100644 drivers/iio/adc/mxs-lradc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 4ef3ad1..5aba3fe 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -310,20 +310,6 @@ config MEN_Z188_ADC
> This driver can also be built as a module. If so, the module will be
> called men_z188_adc.
>
> -config MXS_LRADC
> - tristate "Freescale i.MX23/i.MX28 LRADC"
> - depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM
> - depends on INPUT
> - select STMP_DEVICE
> - select IIO_BUFFER
> - select IIO_TRIGGERED_BUFFER
> - help
> - Say yes here to build support for i.MX23/i.MX28 LRADC convertor
> - built into these chips.
> -
> - To compile this driver as a module, choose M here: the
> - module will be called mxs-lradc.
> -
> config NAU7802
> tristate "Nuvoton NAU7802 ADC driver"
> depends on I2C
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 9bb35c4..b2382ab 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -30,7 +30,6 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
> obj-$(CONFIG_MCP3422) += mcp3422.o
> obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
> obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
> -obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
> obj-$(CONFIG_NAU7802) += nau7802.o
> obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
> obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
> diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
> deleted file mode 100644
> index 33051b8..0000000
> --- a/drivers/iio/adc/mxs-lradc.c
> +++ /dev/null
> @@ -1,1775 +0,0 @@
> -/*
> - * Freescale MXS LRADC driver
> - *
> - * Copyright (c) 2012 DENX Software Engineering, GmbH.
> - * Marek Vasut <marex@denx.de>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> - * GNU General Public License for more details.
> - */
> -
> -#include <linux/bitops.h>
> -#include <linux/clk.h>
> -#include <linux/completion.h>
> -#include <linux/device.h>
> -#include <linux/err.h>
> -#include <linux/input.h>
> -#include <linux/interrupt.h>
> -#include <linux/io.h>
> -#include <linux/kernel.h>
> -#include <linux/module.h>
> -#include <linux/mutex.h>
> -#include <linux/of.h>
> -#include <linux/of_device.h>
> -#include <linux/platform_device.h>
> -#include <linux/slab.h>
> -#include <linux/stmp_device.h>
> -#include <linux/sysfs.h>
> -
> -#include <linux/iio/buffer.h>
> -#include <linux/iio/iio.h>
> -#include <linux/iio/trigger.h>
> -#include <linux/iio/trigger_consumer.h>
> -#include <linux/iio/triggered_buffer.h>
> -#include <linux/iio/sysfs.h>
> -
> -#define DRIVER_NAME "mxs-lradc"
> -
> -#define LRADC_MAX_DELAY_CHANS 4
> -#define LRADC_MAX_MAPPED_CHANS 8
> -#define LRADC_MAX_TOTAL_CHANS 16
> -
> -#define LRADC_DELAY_TIMER_HZ 2000
> -
> -/*
> - * Make this runtime configurable if necessary. Currently, if the buffered mode
> - * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
> - * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
> - * seconds. The result is that the samples arrive every 500mS.
> - */
> -#define LRADC_DELAY_TIMER_PER 200
> -#define LRADC_DELAY_TIMER_LOOP 5
> -
> -/*
> - * Once the pen touches the touchscreen, the touchscreen switches from
> - * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
> - * is realized by worker thread, which is called every 20 or so milliseconds.
> - * This gives the touchscreen enough fluency and does not strain the system
> - * too much.
> - */
> -#define LRADC_TS_SAMPLE_DELAY_MS 5
> -
> -/*
> - * The LRADC reads the following amount of samples from each touchscreen
> - * channel and the driver then computes average of these.
> - */
> -#define LRADC_TS_SAMPLE_AMOUNT 4
> -
> -enum mxs_lradc_id {
> - IMX23_LRADC,
> - IMX28_LRADC,
> -};
> -
> -static const char * const mx23_lradc_irq_names[] = {
> - "mxs-lradc-touchscreen",
> - "mxs-lradc-channel0",
> - "mxs-lradc-channel1",
> - "mxs-lradc-channel2",
> - "mxs-lradc-channel3",
> - "mxs-lradc-channel4",
> - "mxs-lradc-channel5",
> - "mxs-lradc-channel6",
> - "mxs-lradc-channel7",
> -};
> -
> -static const char * const mx28_lradc_irq_names[] = {
> - "mxs-lradc-touchscreen",
> - "mxs-lradc-thresh0",
> - "mxs-lradc-thresh1",
> - "mxs-lradc-channel0",
> - "mxs-lradc-channel1",
> - "mxs-lradc-channel2",
> - "mxs-lradc-channel3",
> - "mxs-lradc-channel4",
> - "mxs-lradc-channel5",
> - "mxs-lradc-channel6",
> - "mxs-lradc-channel7",
> - "mxs-lradc-button0",
> - "mxs-lradc-button1",
> -};
> -
> -struct mxs_lradc_of_config {
> - const int irq_count;
> - const char * const *irq_name;
> - const u32 *vref_mv;
> -};
> -
> -#define VREF_MV_BASE 1850
> -
> -static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> - VREF_MV_BASE, /* CH0 */
> - VREF_MV_BASE, /* CH1 */
> - VREF_MV_BASE, /* CH2 */
> - VREF_MV_BASE, /* CH3 */
> - VREF_MV_BASE, /* CH4 */
> - VREF_MV_BASE, /* CH5 */
> - VREF_MV_BASE * 2, /* CH6 VDDIO */
> - VREF_MV_BASE * 4, /* CH7 VBATT */
> - VREF_MV_BASE, /* CH8 Temp sense 0 */
> - VREF_MV_BASE, /* CH9 Temp sense 1 */
> - VREF_MV_BASE, /* CH10 */
> - VREF_MV_BASE, /* CH11 */
> - VREF_MV_BASE, /* CH12 USB_DP */
> - VREF_MV_BASE, /* CH13 USB_DN */
> - VREF_MV_BASE, /* CH14 VBG */
> - VREF_MV_BASE * 4, /* CH15 VDD5V */
> -};
> -
> -static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
> - VREF_MV_BASE, /* CH0 */
> - VREF_MV_BASE, /* CH1 */
> - VREF_MV_BASE, /* CH2 */
> - VREF_MV_BASE, /* CH3 */
> - VREF_MV_BASE, /* CH4 */
> - VREF_MV_BASE, /* CH5 */
> - VREF_MV_BASE, /* CH6 */
> - VREF_MV_BASE * 4, /* CH7 VBATT */
> - VREF_MV_BASE, /* CH8 Temp sense 0 */
> - VREF_MV_BASE, /* CH9 Temp sense 1 */
> - VREF_MV_BASE * 2, /* CH10 VDDIO */
> - VREF_MV_BASE, /* CH11 VTH */
> - VREF_MV_BASE * 2, /* CH12 VDDA */
> - VREF_MV_BASE, /* CH13 VDDD */
> - VREF_MV_BASE, /* CH14 VBG */
> - VREF_MV_BASE * 4, /* CH15 VDD5V */
> -};
> -
> -static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> - [IMX23_LRADC] = {
> - .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> - .irq_name = mx23_lradc_irq_names,
> - .vref_mv = mx23_vref_mv,
> - },
> - [IMX28_LRADC] = {
> - .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> - .irq_name = mx28_lradc_irq_names,
> - .vref_mv = mx28_vref_mv,
> - },
> -};
> -
> -enum mxs_lradc_ts {
> - MXS_LRADC_TOUCHSCREEN_NONE = 0,
> - MXS_LRADC_TOUCHSCREEN_4WIRE,
> - MXS_LRADC_TOUCHSCREEN_5WIRE,
> -};
> -
> -/*
> - * Touchscreen handling
> - */
> -enum lradc_ts_plate {
> - LRADC_TOUCH = 0,
> - LRADC_SAMPLE_X,
> - LRADC_SAMPLE_Y,
> - LRADC_SAMPLE_PRESSURE,
> - LRADC_SAMPLE_VALID,
> -};
> -
> -enum mxs_lradc_divbytwo {
> - MXS_LRADC_DIV_DISABLED = 0,
> - MXS_LRADC_DIV_ENABLED,
> -};
> -
> -struct mxs_lradc_scale {
> - unsigned int integer;
> - unsigned int nano;
> -};
> -
> -struct mxs_lradc {
> - struct device *dev;
> - void __iomem *base;
> - int irq[13];
> -
> - struct clk *clk;
> -
> - u32 *buffer;
> - struct iio_trigger *trig;
> -
> - struct mutex lock;
> -
> - struct completion completion;
> -
> - const u32 *vref_mv;
> - struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
> - unsigned long is_divided;
> -
> - /*
> - * When the touchscreen is enabled, we give it two private virtual
> - * channels: #6 and #7. This means that only 6 virtual channels (instead
> - * of 8) will be available for buffered capture.
> - */
> -#define TOUCHSCREEN_VCHANNEL1 7
> -#define TOUCHSCREEN_VCHANNEL2 6
> -#define BUFFER_VCHANS_LIMITED 0x3f
> -#define BUFFER_VCHANS_ALL 0xff
> - u8 buffer_vchans;
> -
> - /*
> - * Furthermore, certain LRADC channels are shared between touchscreen
> - * and/or touch-buttons and generic LRADC block. Therefore when using
> - * either of these, these channels are not available for the regular
> - * sampling. The shared channels are as follows:
> - *
> - * CH0 -- Touch button #0
> - * CH1 -- Touch button #1
> - * CH2 -- Touch screen XPUL
> - * CH3 -- Touch screen YPLL
> - * CH4 -- Touch screen XNUL
> - * CH5 -- Touch screen YNLR
> - * CH6 -- Touch screen WIPER (5-wire only)
> - *
> - * The bit fields below represents which parts of the LRADC block are
> - * switched into special mode of operation. These channels can not
> - * be sampled as regular LRADC channels. The driver will refuse any
> - * attempt to sample these channels.
> - */
> -#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
> -#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
> -#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
> - enum mxs_lradc_ts use_touchscreen;
> - bool use_touchbutton;
> -
> - struct input_dev *ts_input;
> -
> - enum mxs_lradc_id soc;
> - enum lradc_ts_plate cur_plate; /* state machine */
> - bool ts_valid;
> - unsigned ts_x_pos;
> - unsigned ts_y_pos;
> - unsigned ts_pressure;
> -
> - /* handle touchscreen's physical behaviour */
> - /* samples per coordinate */
> - unsigned over_sample_cnt;
> - /* time clocks between samples */
> - unsigned over_sample_delay;
> - /* time in clocks to wait after the plates where switched */
> - unsigned settling_delay;
> -};
> -
> -#define LRADC_CTRL0 0x00
> -# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
> -# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
> -# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
> -# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
> -# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
> -# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
> -# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
> -# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
> -
> -# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
> -# define LRADC_CTRL0_MX23_YM BIT(19)
> -# define LRADC_CTRL0_MX23_XM BIT(18)
> -# define LRADC_CTRL0_MX23_YP BIT(17)
> -# define LRADC_CTRL0_MX23_XP BIT(16)
> -
> -# define LRADC_CTRL0_MX28_PLATE_MASK \
> - (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
> - LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
> - LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
> - LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
> -
> -# define LRADC_CTRL0_MX23_PLATE_MASK \
> - (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
> - LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
> - LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
> -
> -#define LRADC_CTRL1 0x10
> -#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
> -#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
> -#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
> -#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
> -#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
> -#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
> -#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
> -#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> -#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> -#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
> -
> -#define LRADC_CTRL2 0x20
> -#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
> -#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
> -
> -#define LRADC_STATUS 0x40
> -#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
> -
> -#define LRADC_CH(n) (0x50 + (0x10 * (n)))
> -#define LRADC_CH_ACCUMULATE BIT(29)
> -#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
> -#define LRADC_CH_NUM_SAMPLES_OFFSET 24
> -#define LRADC_CH_NUM_SAMPLES(x) \
> - ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
> -#define LRADC_CH_VALUE_MASK 0x3ffff
> -#define LRADC_CH_VALUE_OFFSET 0
> -
> -#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
> -#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
> -#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
> -#define LRADC_DELAY_TRIGGER(x) \
> - (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
> - LRADC_DELAY_TRIGGER_LRADCS_MASK)
> -#define LRADC_DELAY_KICK BIT(20)
> -#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
> -#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
> -#define LRADC_DELAY_TRIGGER_DELAYS(x) \
> - (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
> - LRADC_DELAY_TRIGGER_DELAYS_MASK)
> -#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
> -#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
> -#define LRADC_DELAY_LOOP(x) \
> - (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
> - LRADC_DELAY_LOOP_COUNT_MASK)
> -#define LRADC_DELAY_DELAY_MASK 0x7ff
> -#define LRADC_DELAY_DELAY_OFFSET 0
> -#define LRADC_DELAY_DELAY(x) \
> - (((x) << LRADC_DELAY_DELAY_OFFSET) & \
> - LRADC_DELAY_DELAY_MASK)
> -
> -#define LRADC_CTRL4 0x140
> -#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
> -#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
> -#define LRADC_CTRL4_LRADCSELECT(n, x) \
> - (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
> - LRADC_CTRL4_LRADCSELECT_MASK(n))
> -
> -#define LRADC_RESOLUTION 12
> -#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
> -
> -static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
> -}
> -
> -static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
> -}
> -
> -static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
> -{
> - writel(val, lradc->base + reg);
> -}
> -
> -static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_PLATE_MASK;
> - return LRADC_CTRL0_MX28_PLATE_MASK;
> -}
> -
> -static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
> - return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
> -}
> -
> -static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
> - return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
> -}
> -
> -static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
> - return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
> -}
> -
> -static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
> - return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
> -}
> -
> -static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
> - return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
> -}
> -
> -static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
> -{
> - if (lradc->soc == IMX23_LRADC)
> - return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
> - return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
> -}
> -
> -static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
> -{
> - return !!(readl(lradc->base + LRADC_STATUS) &
> - LRADC_STATUS_TOUCH_DETECT_RAW);
> -}
> -
> -static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
> - unsigned ch)
> -{
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
> - LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
> -}
> -
> -static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
> -{
> - /*
> - * prepare for oversampling conversion
> - *
> - * from the datasheet:
> - * "The ACCUMULATE bit in the appropriate channel register
> - * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> - * otherwise, the IRQs will not fire."
> - */
> - mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
> - LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
> - LRADC_CH(ch));
> -
> - /*
> - * from the datasheet:
> - * "Software must clear this register in preparation for a
> - * multi-cycle accumulation.
> - */
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
> -
> - /*
> - * prepare the delay/loop unit according to the oversampling count
> - *
> - * from the datasheet:
> - * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
> - * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
> - * the LRADC will not trigger the delay group."
> - */
> - mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
> - LRADC_DELAY_TRIGGER_DELAYS(0) |
> - LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> - LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> - LRADC_DELAY(3));
> -
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
> -
> - /*
> - * after changing the touchscreen plates setting
> - * the signals need some initial time to settle. Start the
> - * SoC's delay unit and start the conversion later
> - * and automatically.
> - */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> - LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> - LRADC_DELAY_KICK |
> - LRADC_DELAY_DELAY(lradc->settling_delay),
> - LRADC_DELAY(2));
> -}
> -
> -/*
> - * Pressure detection is special:
> - * We want to do both required measurements for the pressure detection in
> - * one turn. Use the hardware features to chain both conversions and let the
> - * hardware report one interrupt if both conversions are done
> - */
> -static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
> - unsigned ch2)
> -{
> - u32 reg;
> -
> - /*
> - * prepare for oversampling conversion
> - *
> - * from the datasheet:
> - * "The ACCUMULATE bit in the appropriate channel register
> - * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
> - * otherwise, the IRQs will not fire."
> - */
> - reg = LRADC_CH_ACCUMULATE |
> - LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
> - mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
> - mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
> -
> - /*
> - * from the datasheet:
> - * "Software must clear this register in preparation for a
> - * multi-cycle accumulation.
> - */
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
> - mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
> -
> - /* prepare the delay/loop unit according to the oversampling count */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(1 << ch1) |
> - LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
> - LRADC_DELAY_TRIGGER_DELAYS(0) |
> - LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
> - LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
> - LRADC_DELAY(3));
> -
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
> -
> - /*
> - * after changing the touchscreen plates setting
> - * the signals need some initial time to settle. Start the
> - * SoC's delay unit and start the conversion later
> - * and automatically.
> - */
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
> - LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
> - LRADC_DELAY_KICK |
> - LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
> -}
> -
> -static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
> - unsigned channel)
> -{
> - u32 reg;
> - unsigned num_samples, val;
> -
> - reg = readl(lradc->base + LRADC_CH(channel));
> - if (reg & LRADC_CH_ACCUMULATE)
> - num_samples = lradc->over_sample_cnt;
> - else
> - num_samples = 1;
> -
> - val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
> - return val / num_samples;
> -}
> -
> -static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
> - unsigned ch1, unsigned ch2)
> -{
> - u32 reg, mask;
> - unsigned pressure, m1, m2;
> -
> - mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
> - reg = readl(lradc->base + LRADC_CTRL1) & mask;
> -
> - while (reg != mask) {
> - reg = readl(lradc->base + LRADC_CTRL1) & mask;
> - dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
> - }
> -
> - m1 = mxs_lradc_read_raw_channel(lradc, ch1);
> - m2 = mxs_lradc_read_raw_channel(lradc, ch2);
> -
> - if (m2 == 0) {
> - dev_warn(lradc->dev, "Cannot calculate pressure\n");
> - return 1 << (LRADC_RESOLUTION - 1);
> - }
> -
> - /* simply scale the value from 0 ... max ADC resolution */
> - pressure = m1;
> - pressure *= (1 << LRADC_RESOLUTION);
> - pressure /= m2;
> -
> - dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
> - return pressure;
> -}
> -
> -#define TS_CH_XP 2
> -#define TS_CH_YP 3
> -#define TS_CH_XM 4
> -#define TS_CH_YM 5
> -
> -/*
> - * YP(open)--+-------------+
> - * | |--+
> - * | | |
> - * YM(-)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(weak+) XM(open)
> - *
> - * "weak+" means 200k Ohm VDDIO
> - * (-) means GND
> - */
> -static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
> -{
> - /*
> - * In order to detect a touch event the 'touch detect enable' bit
> - * enables:
> - * - a weak pullup to the X+ connector
> - * - a strong ground at the Y- connector
> - */
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
> - LRADC_CTRL0);
> -}
> -
> -/*
> - * YP(meas)--+-------------+
> - * | |--+
> - * | | |
> - * YM(open)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(+) XM(-)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_X;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
> - mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -/*
> - * YP(+)--+-------------+
> - * | |--+
> - * | | |
> - * YM(-)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(open) XM(meas)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_Y;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
> - mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -/*
> - * YP(+)--+-------------+
> - * | |--+
> - * | | |
> - * YM(meas)--+-------------+ |
> - * +--------------+
> - * | |
> - * XP(meas) XM(-)
> - *
> - * (+) means here 1.85 V
> - * (-) means here GND
> - */
> -static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> - mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
> -
> - lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
> - mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
> - mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
> - TOUCHSCREEN_VCHANNEL1);
> -}
> -
> -static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_setup_touch_detection(lradc);
> -
> - lradc->cur_plate = LRADC_TOUCH;
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> -}
> -
> -static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> - LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc,
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
> - LRADC_CTRL1);
> - /*
> - * start with the Y-pos, because it uses nearly the same plate
> - * settings like the touch detection
> - */
> - mxs_lradc_prepare_y_pos(lradc);
> -}
> -
> -static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
> -{
> - input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
> - input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
> - input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
> - input_report_key(lradc->ts_input, BTN_TOUCH, 1);
> - input_sync(lradc->ts_input);
> -}
> -
> -static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
> -{
> - mxs_lradc_setup_touch_detection(lradc);
> - lradc->cur_plate = LRADC_SAMPLE_VALID;
> - /*
> - * start a dummy conversion to burn time to settle the signals
> - * note: we are not interested in the conversion's value
> - */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
> - LRADC_CTRL1);
> - mxs_lradc_reg_wrt(
> - lradc,
> - LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
> - LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
> - LRADC_DELAY(2));
> -}
> -
> -/*
> - * in order to avoid false measurements, report only samples where
> - * the surface is still touched after the position measurement
> - */
> -static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
> -{
> - /* if it is still touched, report the sample */
> - if (valid && mxs_lradc_check_touch_event(lradc)) {
> - lradc->ts_valid = true;
> - mxs_lradc_report_ts_event(lradc);
> - }
> -
> - /* if it is even still touched, continue with the next measurement */
> - if (mxs_lradc_check_touch_event(lradc)) {
> - mxs_lradc_prepare_y_pos(lradc);
> - return;
> - }
> -
> - if (lradc->ts_valid) {
> - /* signal the release */
> - lradc->ts_valid = false;
> - input_report_key(lradc->ts_input, BTN_TOUCH, 0);
> - input_sync(lradc->ts_input);
> - }
> -
> - /* if it is released, wait for the next touch via IRQ */
> - lradc->cur_plate = LRADC_TOUCH;
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> - mxs_lradc_reg_clear(lradc,
> - LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
> - LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
> -}
> -
> -/* touchscreen's state machine */
> -static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
> -{
> - switch (lradc->cur_plate) {
> - case LRADC_TOUCH:
> - if (mxs_lradc_check_touch_event(lradc))
> - mxs_lradc_start_touch_event(lradc);
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
> - LRADC_CTRL1);
> - return;
> -
> - case LRADC_SAMPLE_Y:
> - lradc->ts_y_pos =
> - mxs_lradc_read_raw_channel(lradc,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_prepare_x_pos(lradc);
> - return;
> -
> - case LRADC_SAMPLE_X:
> - lradc->ts_x_pos =
> - mxs_lradc_read_raw_channel(lradc,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_prepare_pressure(lradc);
> - return;
> -
> - case LRADC_SAMPLE_PRESSURE:
> - lradc->ts_pressure =
> - mxs_lradc_read_ts_pressure(lradc,
> - TOUCHSCREEN_VCHANNEL2,
> - TOUCHSCREEN_VCHANNEL1);
> - mxs_lradc_complete_touch_event(lradc);
> - return;
> -
> - case LRADC_SAMPLE_VALID:
> - mxs_lradc_finish_touch_event(lradc, 1);
> - break;
> - }
> -}
> -
> -/*
> - * Raw I/O operations
> - */
> -static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> - int ret;
> -
> - /*
> - * See if there is no buffered operation in progress. If there is, simply
> - * bail out. This can be improved to support both buffered and raw IO at
> - * the same time, yet the code becomes horribly complicated. Therefore I
> - * applied KISS principle here.
> - */
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - reinit_completion(&lradc->completion);
> -
> - /*
> - * No buffered operation in progress, map the channel and trigger it.
> - * Virtual channel 0 is always used here as the others are always not
> - * used if doing raw sampling.
> - */
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
> - LRADC_CTRL1);
> - mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
> -
> - /* Enable / disable the divider per requirement */
> - if (test_bit(chan, &lradc->is_divided))
> - mxs_lradc_reg_set(lradc,
> - 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> - LRADC_CTRL2);
> - else
> - mxs_lradc_reg_clear(lradc,
> - 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
> - LRADC_CTRL2);
> -
> - /* Clean the slot's previous content, then set new one. */
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
> - LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
> -
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
> -
> - /* Enable the IRQ and start sampling the channel. */
> - mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
> -
> - /* Wait for completion on the channel, 1 second max. */
> - ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
> - if (!ret)
> - ret = -ETIMEDOUT;
> - if (ret < 0)
> - goto err;
> -
> - /* Read the data. */
> - *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
> - ret = IIO_VAL_INT;
> -
> -err:
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
> -
> - mutex_unlock(&lradc->lock);
> -
> - return ret;
> -}
> -
> -static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
> -{
> - int ret, min, max;
> -
> - ret = mxs_lradc_read_single(iio_dev, 8, &min);
> - if (ret != IIO_VAL_INT)
> - return ret;
> -
> - ret = mxs_lradc_read_single(iio_dev, 9, &max);
> - if (ret != IIO_VAL_INT)
> - return ret;
> -
> - *val = max - min;
> -
> - return IIO_VAL_INT;
> -}
> -
> -static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - int *val, int *val2, long m)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> -
> - switch (m) {
> - case IIO_CHAN_INFO_RAW:
> - if (chan->type == IIO_TEMP)
> - return mxs_lradc_read_temp(iio_dev, val);
> -
> - return mxs_lradc_read_single(iio_dev, chan->channel, val);
> -
> - case IIO_CHAN_INFO_SCALE:
> - if (chan->type == IIO_TEMP) {
> - /*
> - * From the datasheet, we have to multiply by 1.012 and
> - * divide by 4
> - */
> - *val = 0;
> - *val2 = 253000;
> - return IIO_VAL_INT_PLUS_MICRO;
> - }
> -
> - *val = lradc->vref_mv[chan->channel];
> - *val2 = chan->scan_type.realbits -
> - test_bit(chan->channel, &lradc->is_divided);
> - return IIO_VAL_FRACTIONAL_LOG2;
> -
> - case IIO_CHAN_INFO_OFFSET:
> - if (chan->type == IIO_TEMP) {
> - /*
> - * The calculated value from the ADC is in Kelvin, we
> - * want Celsius for hwmon so the offset is -273.15
> - * The offset is applied before scaling so it is
> - * actually -213.15 * 4 / 1.012 = -1079.644268
> - */
> - *val = -1079;
> - *val2 = 644268;
> -
> - return IIO_VAL_INT_PLUS_MICRO;
> - }
> -
> - return -EINVAL;
> -
> - default:
> - break;
> - }
> -
> - return -EINVAL;
> -}
> -
> -static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - int val, int val2, long m)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio_dev);
> - struct mxs_lradc_scale *scale_avail =
> - lradc->scale_avail[chan->channel];
> - int ret;
> -
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - switch (m) {
> - case IIO_CHAN_INFO_SCALE:
> - ret = -EINVAL;
> - if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
> - val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
> - /* divider by two disabled */
> - clear_bit(chan->channel, &lradc->is_divided);
> - ret = 0;
> - } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
> - val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
> - /* divider by two enabled */
> - set_bit(chan->channel, &lradc->is_divided);
> - ret = 0;
> - }
> -
> - break;
> - default:
> - ret = -EINVAL;
> - break;
> - }
> -
> - mutex_unlock(&lradc->lock);
> -
> - return ret;
> -}
> -
> -static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
> - const struct iio_chan_spec *chan,
> - long m)
> -{
> - return IIO_VAL_INT_PLUS_NANO;
> -}
> -
> -static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
> - struct device_attribute *attr,
> - char *buf,
> - int ch)
> -{
> - struct iio_dev *iio = dev_to_iio_dev(dev);
> - struct mxs_lradc *lradc = iio_priv(iio);
> - int i, len = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
> - len += sprintf(buf + len, "%u.%09u ",
> - lradc->scale_avail[ch][i].integer,
> - lradc->scale_avail[ch][i].nano);
> -
> - len += sprintf(buf + len, "\n");
> -
> - return len;
> -}
> -
> -static ssize_t mxs_lradc_show_scale_available(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
> -
> - return mxs_lradc_show_scale_available_ch(dev, attr, buf,
> - iio_attr->address);
> -}
> -
> -#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
> -static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
> - mxs_lradc_show_scale_available, NULL, ch)
> -
> -SHOW_SCALE_AVAILABLE_ATTR(0);
> -SHOW_SCALE_AVAILABLE_ATTR(1);
> -SHOW_SCALE_AVAILABLE_ATTR(2);
> -SHOW_SCALE_AVAILABLE_ATTR(3);
> -SHOW_SCALE_AVAILABLE_ATTR(4);
> -SHOW_SCALE_AVAILABLE_ATTR(5);
> -SHOW_SCALE_AVAILABLE_ATTR(6);
> -SHOW_SCALE_AVAILABLE_ATTR(7);
> -SHOW_SCALE_AVAILABLE_ATTR(10);
> -SHOW_SCALE_AVAILABLE_ATTR(11);
> -SHOW_SCALE_AVAILABLE_ATTR(12);
> -SHOW_SCALE_AVAILABLE_ATTR(13);
> -SHOW_SCALE_AVAILABLE_ATTR(14);
> -SHOW_SCALE_AVAILABLE_ATTR(15);
> -
> -static struct attribute *mxs_lradc_attributes[] = {
> - &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
> - &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
> - NULL
> -};
> -
> -static const struct attribute_group mxs_lradc_attribute_group = {
> - .attrs = mxs_lradc_attributes,
> -};
> -
> -static const struct iio_info mxs_lradc_iio_info = {
> - .driver_module = THIS_MODULE,
> - .read_raw = mxs_lradc_read_raw,
> - .write_raw = mxs_lradc_write_raw,
> - .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
> - .attrs = &mxs_lradc_attribute_group,
> -};
> -
> -static int mxs_lradc_ts_open(struct input_dev *dev)
> -{
> - struct mxs_lradc *lradc = input_get_drvdata(dev);
> -
> - /* Enable the touch-detect circuitry. */
> - mxs_lradc_enable_touch_detection(lradc);
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
> -{
> - /* stop all interrupts from firing */
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
> -
> - /* Power-down touchscreen touch-detect circuitry. */
> - mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
> -}
> -
> -static void mxs_lradc_ts_close(struct input_dev *dev)
> -{
> - struct mxs_lradc *lradc = input_get_drvdata(dev);
> -
> - mxs_lradc_disable_ts(lradc);
> -}
> -
> -static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
> -{
> - struct input_dev *input;
> - struct device *dev = lradc->dev;
> - int ret;
> -
> - if (!lradc->use_touchscreen)
> - return 0;
> -
> - input = input_allocate_device();
> - if (!input)
> - return -ENOMEM;
> -
> - input->name = DRIVER_NAME;
> - input->id.bustype = BUS_HOST;
> - input->dev.parent = dev;
> - input->open = mxs_lradc_ts_open;
> - input->close = mxs_lradc_ts_close;
> -
> - __set_bit(EV_ABS, input->evbit);
> - __set_bit(EV_KEY, input->evbit);
> - __set_bit(BTN_TOUCH, input->keybit);
> - input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> - input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
> - input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
> - 0, 0);
> -
> - lradc->ts_input = input;
> - input_set_drvdata(input, lradc);
> - ret = input_register_device(input);
> - if (ret)
> - input_free_device(lradc->ts_input);
> -
> - return ret;
> -}
> -
> -static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc)
> -{
> - if (!lradc->use_touchscreen)
> - return;
> -
> - mxs_lradc_disable_ts(lradc);
> - input_unregister_device(lradc->ts_input);
> -}
> -
> -/*
> - * IRQ Handling
> - */
> -static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
> -{
> - struct iio_dev *iio = data;
> - struct mxs_lradc *lradc = iio_priv(iio);
> - unsigned long reg = readl(lradc->base + LRADC_CTRL1);
> - u32 clr_irq = mxs_lradc_irq_mask(lradc);
> - const u32 ts_irq_mask =
> - LRADC_CTRL1_TOUCH_DETECT_IRQ |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
> -
> - if (!(reg & mxs_lradc_irq_mask(lradc)))
> - return IRQ_NONE;
> -
> - if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
> - mxs_lradc_handle_touch(lradc);
> -
> - /* Make sure we don't clear the next conversion's interrupt. */
> - clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> - LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
> - }
> -
> - if (iio_buffer_enabled(iio)) {
> - if (reg & lradc->buffer_vchans)
> - iio_trigger_poll(iio->trig);
> - } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
> - complete(&lradc->completion);
> - }
> -
> - mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
> -
> - return IRQ_HANDLED;
> -}
> -
> -/*
> - * Trigger handling
> - */
> -static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
> -{
> - struct iio_poll_func *pf = p;
> - struct iio_dev *iio = pf->indio_dev;
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const u32 chan_value = LRADC_CH_ACCUMULATE |
> - ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> - unsigned int i, j = 0;
> -
> - for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> - lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
> - mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
> - lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
> - lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
> - j++;
> - }
> -
> - iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
> -
> - iio_trigger_notify_done(iio->trig);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
> -{
> - struct iio_dev *iio = iio_trigger_get_drvdata(trig);
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
> -
> - mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
> -
> - return 0;
> -}
> -
> -static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
> - .owner = THIS_MODULE,
> - .set_trigger_state = &mxs_lradc_configure_trigger,
> -};
> -
> -static int mxs_lradc_trigger_init(struct iio_dev *iio)
> -{
> - int ret;
> - struct iio_trigger *trig;
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
> - if (!trig)
> - return -ENOMEM;
> -
> - trig->dev.parent = lradc->dev;
> - iio_trigger_set_drvdata(trig, iio);
> - trig->ops = &mxs_lradc_trigger_ops;
> -
> - ret = iio_trigger_register(trig);
> - if (ret) {
> - iio_trigger_free(trig);
> - return ret;
> - }
> -
> - lradc->trig = trig;
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_trigger_remove(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - iio_trigger_unregister(lradc->trig);
> - iio_trigger_free(lradc->trig);
> -}
> -
> -static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> - int ret = 0, chan, ofs = 0;
> - unsigned long enable = 0;
> - u32 ctrl4_set = 0;
> - u32 ctrl4_clr = 0;
> - u32 ctrl1_irq = 0;
> - const u32 chan_value = LRADC_CH_ACCUMULATE |
> - ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
> - const int len = bitmap_weight(iio->active_scan_mask,
> - LRADC_MAX_TOTAL_CHANS);
> -
> - if (!len)
> - return -EINVAL;
> -
> - /*
> - * Lock the driver so raw access can not be done during buffered
> - * operation. This simplifies the code a lot.
> - */
> - ret = mutex_trylock(&lradc->lock);
> - if (!ret)
> - return -EBUSY;
> -
> - lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
> - if (!lradc->buffer) {
> - ret = -ENOMEM;
> - goto err_mem;
> - }
> -
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(
> - lradc,
> - lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> - LRADC_CTRL1);
> - mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> -
> - for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
> - ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
> - ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
> - ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
> - mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
> - bitmap_set(&enable, ofs, 1);
> - ofs++;
> - }
> -
> - mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> - LRADC_DELAY_KICK, LRADC_DELAY(0));
> - mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
> - mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
> - mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
> - LRADC_DELAY(0));
> -
> - return 0;
> -
> -err_mem:
> - mutex_unlock(&lradc->lock);
> - return ret;
> -}
> -
> -static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
> - LRADC_DELAY_KICK, LRADC_DELAY(0));
> -
> - mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
> - if (lradc->soc == IMX28_LRADC)
> - mxs_lradc_reg_clear(
> - lradc,
> - lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> - LRADC_CTRL1);
> -
> - kfree(lradc->buffer);
> - mutex_unlock(&lradc->lock);
> -
> - return 0;
> -}
> -
> -static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
> - const unsigned long *mask)
> -{
> - struct mxs_lradc *lradc = iio_priv(iio);
> - const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
> - int rsvd_chans = 0;
> - unsigned long rsvd_mask = 0;
> -
> - if (lradc->use_touchbutton)
> - rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
> - rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> - rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
> -
> - if (lradc->use_touchbutton)
> - rsvd_chans++;
> - if (lradc->use_touchscreen)
> - rsvd_chans += 2;
> -
> - /* Test for attempts to map channels with special mode of operation. */
> - if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
> - return false;
> -
> - /* Test for attempts to map more channels then available slots. */
> - if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
> - return false;
> -
> - return true;
> -}
> -
> -static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
> - .preenable = &mxs_lradc_buffer_preenable,
> - .postenable = &iio_triggered_buffer_postenable,
> - .predisable = &iio_triggered_buffer_predisable,
> - .postdisable = &mxs_lradc_buffer_postdisable,
> - .validate_scan_mask = &mxs_lradc_validate_scan_mask,
> -};
> -
> -/*
> - * Driver initialization
> - */
> -
> -#define MXS_ADC_CHAN(idx, chan_type, name) { \
> - .type = (chan_type), \
> - .indexed = 1, \
> - .scan_index = (idx), \
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> - BIT(IIO_CHAN_INFO_SCALE), \
> - .channel = (idx), \
> - .address = (idx), \
> - .scan_type = { \
> - .sign = 'u', \
> - .realbits = LRADC_RESOLUTION, \
> - .storagebits = 32, \
> - }, \
> - .datasheet_name = (name), \
> -}
> -
> -static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
> - MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> - MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> - MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> - MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> - MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> - MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> - MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
> - MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> - /* Combined Temperature sensors */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = 8,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> - BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SCALE),
> - .channel = 8,
> - .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> - .datasheet_name = "TEMP_DIE",
> - },
> - /* Hidden channel to keep indexes */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = -1,
> - .channel = 9,
> - },
> - MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
> - MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
> - MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
> - MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
> - MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> - MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> -};
> -
> -static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
> - MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
> - MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
> - MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
> - MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
> - MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
> - MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
> - MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
> - MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
> - /* Combined Temperature sensors */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = 8,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> - BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SCALE),
> - .channel = 8,
> - .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
> - .datasheet_name = "TEMP_DIE",
> - },
> - /* Hidden channel to keep indexes */
> - {
> - .type = IIO_TEMP,
> - .indexed = 1,
> - .scan_index = -1,
> - .channel = 9,
> - },
> - MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
> - MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
> - MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
> - MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
> - MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
> - MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
> -};
> -
> -static int mxs_lradc_hw_init(struct mxs_lradc *lradc)
> -{
> - /* The ADC always uses DELAY CHANNEL 0. */
> - const u32 adc_cfg =
> - (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
> - (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
> -
> - int ret = stmp_reset_block(lradc->base);
> -
> - if (ret)
> - return ret;
> -
> - /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
> - mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
> -
> - /* Disable remaining DELAY CHANNELs */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
> -
> - /* Configure the touchscreen type */
> - if (lradc->soc == IMX28_LRADC) {
> - mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> - LRADC_CTRL0);
> -
> - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
> - mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> - LRADC_CTRL0);
> - }
> -
> - /* Start internal temperature sensing. */
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
> -
> - return 0;
> -}
> -
> -static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
> -{
> - int i;
> -
> - mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1);
> -
> - for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
> - mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
> -}
> -
> -static const struct of_device_id mxs_lradc_dt_ids[] = {
> - { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> - { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> - { /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> -
> -static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
> - struct device_node *lradc_node)
> -{
> - int ret;
> - u32 ts_wires = 0, adapt;
> -
> - ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
> - &ts_wires);
> - if (ret)
> - return -ENODEV; /* touchscreen feature disabled */
> -
> - switch (ts_wires) {
> - case 4:
> - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> - break;
> - case 5:
> - if (lradc->soc == IMX28_LRADC) {
> - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> - break;
> - }
> - /* fall through an error message for i.MX23 */
> - default:
> - dev_err(lradc->dev,
> - "Unsupported number of touchscreen wires (%d)\n",
> - ts_wires);
> - return -EINVAL;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
> - lradc->over_sample_cnt = 4;
> - } else {
> - if (adapt < 1 || adapt > 32) {
> - dev_err(lradc->dev, "Invalid sample count (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->over_sample_cnt = adapt;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
> - lradc->over_sample_delay = 2;
> - } else {
> - if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
> - dev_err(lradc->dev, "Invalid sample delay (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->over_sample_delay = adapt;
> - }
> -
> - if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
> - lradc->settling_delay = 10;
> - } else {
> - if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
> - dev_err(lradc->dev, "Invalid settling delay (%u)\n",
> - adapt);
> - return -EINVAL;
> - }
> - lradc->settling_delay = adapt;
> - }
> -
> - return 0;
> -}
> -
> -static int mxs_lradc_probe(struct platform_device *pdev)
> -{
> - const struct of_device_id *of_id =
> - of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> - const struct mxs_lradc_of_config *of_cfg =
> - &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> - struct device *dev = &pdev->dev;
> - struct device_node *node = dev->of_node;
> - struct mxs_lradc *lradc;
> - struct iio_dev *iio;
> - struct resource *iores;
> - int ret = 0, touch_ret;
> - int i, s;
> - u64 scale_uv;
> -
> - /* Allocate the IIO device. */
> - iio = devm_iio_device_alloc(dev, sizeof(*lradc));
> - if (!iio) {
> - dev_err(dev, "Failed to allocate IIO device\n");
> - return -ENOMEM;
> - }
> -
> - lradc = iio_priv(iio);
> - lradc->soc = (enum mxs_lradc_id)of_id->data;
> -
> - /* Grab the memory area */
> - iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - lradc->dev = &pdev->dev;
> - lradc->base = devm_ioremap_resource(dev, iores);
> - if (IS_ERR(lradc->base))
> - return PTR_ERR(lradc->base);
> -
> - lradc->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(lradc->clk)) {
> - dev_err(dev, "Failed to get the delay unit clock\n");
> - return PTR_ERR(lradc->clk);
> - }
> - ret = clk_prepare_enable(lradc->clk);
> - if (ret != 0) {
> - dev_err(dev, "Failed to enable the delay unit clock\n");
> - return ret;
> - }
> -
> - touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
> -
> - if (touch_ret == 0)
> - lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> - else
> - lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> -
> - /* Grab all IRQ sources */
> - for (i = 0; i < of_cfg->irq_count; i++) {
> - lradc->irq[i] = platform_get_irq(pdev, i);
> - if (lradc->irq[i] < 0) {
> - ret = lradc->irq[i];
> - goto err_clk;
> - }
> -
> - ret = devm_request_irq(dev, lradc->irq[i],
> - mxs_lradc_handle_irq, 0,
> - of_cfg->irq_name[i], iio);
> - if (ret)
> - goto err_clk;
> - }
> -
> - lradc->vref_mv = of_cfg->vref_mv;
> -
> - platform_set_drvdata(pdev, iio);
> -
> - init_completion(&lradc->completion);
> - mutex_init(&lradc->lock);
> -
> - iio->name = pdev->name;
> - iio->dev.parent = &pdev->dev;
> - iio->info = &mxs_lradc_iio_info;
> - iio->modes = INDIO_DIRECT_MODE;
> - iio->masklength = LRADC_MAX_TOTAL_CHANS;
> -
> - if (lradc->soc == IMX23_LRADC) {
> - iio->channels = mx23_lradc_chan_spec;
> - iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
> - } else {
> - iio->channels = mx28_lradc_chan_spec;
> - iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
> - }
> -
> - ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
> - &mxs_lradc_trigger_handler,
> - &mxs_lradc_buffer_ops);
> - if (ret)
> - goto err_clk;
> -
> - ret = mxs_lradc_trigger_init(iio);
> - if (ret)
> - goto err_trig;
> -
> - /* Populate available ADC input ranges */
> - for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
> - for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
> - /*
> - * [s=0] = optional divider by two disabled (default)
> - * [s=1] = optional divider by two enabled
> - *
> - * The scale is calculated by doing:
> - * Vref >> (realbits - s)
> - * which multiplies by two on the second component
> - * of the array.
> - */
> - scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
> - (LRADC_RESOLUTION - s);
> - lradc->scale_avail[i][s].nano =
> - do_div(scale_uv, 100000000) * 10;
> - lradc->scale_avail[i][s].integer = scale_uv;
> - }
> - }
> -
> - /* Configure the hardware. */
> - ret = mxs_lradc_hw_init(lradc);
> - if (ret)
> - goto err_dev;
> -
> - /* Register the touchscreen input device. */
> - if (touch_ret == 0) {
> - ret = mxs_lradc_ts_register(lradc);
> - if (ret)
> - goto err_ts_register;
> - }
> -
> - /* Register IIO device. */
> - ret = iio_device_register(iio);
> - if (ret) {
> - dev_err(dev, "Failed to register IIO device\n");
> - goto err_ts;
> - }
> -
> - return 0;
> -
> -err_ts:
> - mxs_lradc_ts_unregister(lradc);
> -err_ts_register:
> - mxs_lradc_hw_stop(lradc);
> -err_dev:
> - mxs_lradc_trigger_remove(iio);
> -err_trig:
> - iio_triggered_buffer_cleanup(iio);
> -err_clk:
> - clk_disable_unprepare(lradc->clk);
> - return ret;
> -}
> -
> -static int mxs_lradc_remove(struct platform_device *pdev)
> -{
> - struct iio_dev *iio = platform_get_drvdata(pdev);
> - struct mxs_lradc *lradc = iio_priv(iio);
> -
> - iio_device_unregister(iio);
> - mxs_lradc_ts_unregister(lradc);
> - mxs_lradc_hw_stop(lradc);
> - mxs_lradc_trigger_remove(iio);
> - iio_triggered_buffer_cleanup(iio);
> -
> - clk_disable_unprepare(lradc->clk);
> -
> - return 0;
> -}
> -
> -static struct platform_driver mxs_lradc_driver = {
> - .driver = {
> - .name = DRIVER_NAME,
> - .of_match_table = mxs_lradc_dt_ids,
> - },
> - .probe = mxs_lradc_probe,
> - .remove = mxs_lradc_remove,
> -};
> -
> -module_platform_driver(mxs_lradc_driver);
> -
> -MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
> -MODULE_DESCRIPTION("Freescale MXS LRADC driver");
> -MODULE_LICENSE("GPL v2");
> -MODULE_ALIAS("platform:" DRIVER_NAME);
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD
2016-06-08 14:45 ` [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
2016-06-11 15:32 ` Jonathan Cameron
@ 2016-06-15 21:17 ` Stefan Wahren
1 sibling, 0 replies; 11+ messages in thread
From: Stefan Wahren @ 2016-06-15 21:17 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, linux-input, pmeerw, jic23, knaack.h, lars,
dmitry.torokhov, harald, fabio.estevam, linux-iio, marex
Hi Ksenija,
sorry for the late review, but i was busy.
> Ksenija Stanojevic <ksenija.stanojevic@gmail.com> hat am 8. Juni 2016 um 16:45
> geschrieben:
>
>
> Add core files for mxs-lradc MFD driver.
I think it's worth to mention that this patch won't compile in iio/testing
without this patch:
a8f447be8056 ("mfd: Add resource managed APIs for mfd_add_devices")
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> ---
> Changes in v2:
> - do not change spacing in Kconfig
> - make struct mfd_cell part of struct mxs_lradc
> - use switch instead of if in mxs_lradc_irq_mask
> - use only necessary header files in mxs_lradc.h
> - use devm_mfd_add_device
> - use separate function to register mfd device
> - change licence to GPL
> - add copyright
>
> drivers/mfd/Kconfig | 17 ++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/mxs-lradc.c | 215
> ++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/mxs-lradc.h | 204 +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 437 insertions(+)
> create mode 100644 drivers/mfd/mxs-lradc.c
> create mode 100644 include/linux/mfd/mxs-lradc.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9ca66de..62593ad 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -271,6 +271,23 @@ config MFD_MC13XXX_I2C
> help
> Select this if your MC13xxx is connected via an I2C bus.
>
> +config MFD_MXS_LRADC
> + tristate "Freescale i.MX23/i.MX28 LRADC"
> + depends on ARCH_MXS || COMPILE_TEST
> + select MFD_CORE
> + select STMP_DEVICE
> + help
> + Say yes here to build support for the low-resolution
> + analog-to-digital converter (LRADC) found on the i.MX23 and i.MX28
> + processors. This driver provides common support for accessing the
> + device, additional drivers must be enabled in order to use the
> + functionality of the device:
> + mxs-lradc-adc for ADC readings
> + mxs-lradc-ts for touchscreen support
> +
> + This driver can also be built as a module. If so, the module will be
> + called mxs-lradc.
> +
> config MFD_HI6421_PMIC
> tristate "HiSilicon Hi6421 PMU/Codec IC"
> depends on OF
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 0f230a6..ecf6399 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -198,3 +198,4 @@ intel-soc-pmic-objs := intel_soc_pmic_core.o
> intel_soc_pmic_crc.o
> intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC) += intel_soc_pmic_bxtwc.o
> obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
> obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
> +obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
> diff --git a/drivers/mfd/mxs-lradc.c b/drivers/mfd/mxs-lradc.c
> new file mode 100644
> index 0000000..5e894bb
> --- /dev/null
> +++ b/drivers/mfd/mxs-lradc.c
> @@ -0,0 +1,215 @@
> +/*
> + * Freescale MXS LRADC driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@denx.de>
> + * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/mxs-lradc.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +static const char * const mx23_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> +};
> +
> +static const char * const mx28_lradc_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-thresh0",
> + "mxs-lradc-thresh1",
> + "mxs-lradc-channel0",
> + "mxs-lradc-channel1",
> + "mxs-lradc-channel2",
> + "mxs-lradc-channel3",
> + "mxs-lradc-channel4",
> + "mxs-lradc-channel5",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> + "mxs-lradc-button0",
> + "mxs-lradc-button1",
> +};
> +
> +struct mxs_lradc_of_config {
> + const int irq_count;
> + const char * const *irq_name;
> +};
> +
> +static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
> + [IMX23_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
> + .irq_name = mx23_lradc_irq_names,
> + },
> + [IMX28_LRADC] = {
> + .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
> + .irq_name = mx28_lradc_irq_names,
> + },
> +};
> +
> +static const struct of_device_id mxs_lradc_dt_ids[] = {
> + { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
> + { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
> +
> +static int mxs_lradc_add_device(struct platform_device *pdev,
> + struct mxs_lradc *lradc, char *name, int i)
> +{
> + struct mfd_cell *cell;
> +
> + cell = &lradc->cells[i];
> + cell->name = name;
> + cell->platform_data = lradc;
> + cell->pdata_size = sizeof(*lradc);
> +
> + return devm_mfd_add_devices(&pdev->dev, -1, cell, 1, NULL, 0, NULL);
> +}
> +
> +static int mxs_lradc_probe(struct platform_device *pdev)
> +{
> + const struct of_device_id *of_id =
> + of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> + const struct mxs_lradc_of_config *of_cfg =
> + &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct mxs_lradc *lradc;
> + struct resource *iores;
> + int ret = 0, touch_ret, i;
> + u32 ts_wires = 0;
> +
> + lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
> + if (!lradc)
> + return -ENOMEM;
> + lradc->soc = (enum mxs_lradc_id)of_id->data;
> +
> + /* Grab the memory area */
> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + lradc->base = devm_ioremap_resource(dev, iores);
> + if (IS_ERR(lradc->base))
> + return PTR_ERR(lradc->base);
> +
> + lradc->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(lradc->clk)) {
> + dev_err(dev, "Failed to get the delay unit clock\n");
> + return PTR_ERR(lradc->clk);
> + }
> + ret = clk_prepare_enable(lradc->clk);
> + if (ret != 0) {
> + dev_err(dev, "Failed to enable the delay unit clock\n");
> + return ret;
> + }
> +
> + touch_ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
> + &ts_wires);
> +
> + if (touch_ret == 0)
> + lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
> + else
> + lradc->buffer_vchans = BUFFER_VCHANS_ALL;
> +
> + lradc->irq_count = of_cfg->irq_count;
> + lradc->irq_name = of_cfg->irq_name;
> + for (i = 0; i < lradc->irq_count; i++) {
> + lradc->irq[i] = platform_get_irq(pdev, i);
> + if (lradc->irq[i] < 0) {
> + ret = lradc->irq[i];
> + goto err_clk;
> + }
> + }
> +
> + platform_set_drvdata(pdev, lradc);
> +
> + ret = stmp_reset_block(lradc->base);
> + if (ret)
> + return ret;
> +
> + switch (ts_wires) {
> + case 4:
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
> + break;
> + case 5:
> + if (lradc->soc == IMX28_LRADC) {
> + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
> + break;
> + }
> + /* fall through an error message for i.MX23 */
> + default:
> + dev_err(&pdev->dev,
> + "Unsupported number of touchscreen wires (%d)\n",
> + ts_wires);
> + return -EINVAL;
> + }
The complete switch statement should be in the if (touch_ret == 0) branch:
* so we don't reset the block in case of invalid devicetree settings
* handle the optional property fsl,lradc-touchscreen-wires correctly
> +
> + ret = mxs_lradc_add_device(pdev, lradc, DRIVER_NAME_ADC, 0);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
> + goto err_clk;
> + }
> +
> + if (!lradc->use_touchscreen)
> + return 0;
> +
> + ret = mxs_lradc_add_device(pdev, lradc, DRIVER_NAME_TS, 1);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "Failed to add the touchscreen subdevice\n");
> + goto err_clk;
> + }
> +
> + return 0;
> +
> +err_clk:
> + clk_disable_unprepare(lradc->clk);
> +
> + return ret;
> +}
> +
> +static int mxs_lradc_remove(struct platform_device *pdev)
> +{
> + struct mxs_lradc *lradc = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(lradc->clk);
> +
> + return 0;
> +}
> +
> +static struct platform_driver mxs_lradc_driver = {
> + .driver = {
> + .name = "mxs-lradc",
> + .of_match_table = mxs_lradc_dt_ids,
> + },
> + .probe = mxs_lradc_probe,
> + .remove = mxs_lradc_remove,
> +};
> +
> +module_platform_driver(mxs_lradc_driver);
> +
> +MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
> +MODULE_LICENSE("GPL");
MODULE_AUTHOR ?
> +MODULE_ALIAS("platform:mxs-lradc");
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-06-08 14:48 ` [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
@ 2016-06-15 21:26 ` Stefan Wahren
2016-06-23 17:24 ` Dmitry Torokhov
0 siblings, 1 reply; 11+ messages in thread
From: Stefan Wahren @ 2016-06-15 21:26 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, linux-input, pmeerw, jic23, knaack.h, lars,
dmitry.torokhov, harald, fabio.estevam, linux-iio, marex
Hi,
unfortunately i still don't have a touchscreen to test this patch.
> Ksenija Stanojevic <ksenija.stanojevic@gmail.com> hat am 8. Juni 2016 um 16:48
> geschrieben:
>
>
> Add 4-wire/5-wire touchscreen controller.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> ---
> Changes in v2:
> - do not change spacing in Kconfig
> - remove dev.parent
> - rename err_ts_register to error
> - combine functions hw_stop and disable_ts so that mxs_lradc_ts_remove
> could be deleted.
> - add spinlock in struct mxs_lradc_ts to enable locking in interrupt handler.
> - only grab irqs that are relevant to touchscreen
> - use direct return instead assigning error to touch_ret in probe function.
> - change licence to GPL
> - add copyright
>
> drivers/input/touchscreen/Kconfig | 10 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/mxs-lradc-ts.c | 726
> +++++++++++++++++++++++++++++++
> 3 files changed, 737 insertions(+)
> create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
>
> diff --git a/drivers/input/touchscreen/mxs-lradc-ts.c
> b/drivers/input/touchscreen/mxs-lradc-ts.c
> new file mode 100644
> index 0000000..778bb61
> --- /dev/null
> +++ b/drivers/input/touchscreen/mxs-lradc-ts.c
> @@ -0,0 +1,726 @@
> +/*
> + * Freescale MXS LRADC driver
touchscreen driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Marek Vasut <marex@denx.de>
> + * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> ...
> +
> +static struct platform_driver mxs_lradc_ts_driver = {
> + .driver = {
> + .name = DRIVER_NAME_TS,
> + },
> + .probe = mxs_lradc_ts_probe,
> +};
> +module_platform_driver(mxs_lradc_ts_driver);
> +
MODULE_DESCRIPTION ?
MODULE_AUTHOR ?
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-06-15 21:26 ` Stefan Wahren
@ 2016-06-23 17:24 ` Dmitry Torokhov
0 siblings, 0 replies; 11+ messages in thread
From: Dmitry Torokhov @ 2016-06-23 17:24 UTC (permalink / raw)
To: Stefan Wahren
Cc: Ksenija Stanojevic, linux-kernel, lee.jones, linux-input, pmeerw,
jic23, knaack.h, lars, harald, fabio.estevam, linux-iio, marex
On Wed, Jun 15, 2016 at 11:26:18PM +0200, Stefan Wahren wrote:
> Hi,
>
> unfortunately i still don't have a touchscreen to test this patch.
>
> > Ksenija Stanojevic <ksenija.stanojevic@gmail.com> hat am 8. Juni 2016 um 16:48
> > geschrieben:
> >
> >
> > Add 4-wire/5-wire touchscreen controller.
> >
> > Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> > ---
> > Changes in v2:
> > - do not change spacing in Kconfig
> > - remove dev.parent
> > - rename err_ts_register to error
> > - combine functions hw_stop and disable_ts so that mxs_lradc_ts_remove
> > could be deleted.
> > - add spinlock in struct mxs_lradc_ts to enable locking in interrupt handler.
> > - only grab irqs that are relevant to touchscreen
> > - use direct return instead assigning error to touch_ret in probe function.
> > - change licence to GPL
> > - add copyright
> >
> > drivers/input/touchscreen/Kconfig | 10 +
> > drivers/input/touchscreen/Makefile | 1 +
> > drivers/input/touchscreen/mxs-lradc-ts.c | 726
> > +++++++++++++++++++++++++++++++
> > 3 files changed, 737 insertions(+)
> > create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
> >
> > diff --git a/drivers/input/touchscreen/mxs-lradc-ts.c
> > b/drivers/input/touchscreen/mxs-lradc-ts.c
> > new file mode 100644
> > index 0000000..778bb61
> > --- /dev/null
> > +++ b/drivers/input/touchscreen/mxs-lradc-ts.c
> > @@ -0,0 +1,726 @@
> > +/*
> > + * Freescale MXS LRADC driver
>
> touchscreen driver
>
> > + *
> > + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> > + * Marek Vasut <marex@denx.de>
> > + * Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > ...
> > +
> > +static struct platform_driver mxs_lradc_ts_driver = {
> > + .driver = {
> > + .name = DRIVER_NAME_TS,
> > + },
> > + .probe = mxs_lradc_ts_probe,
> > +};
> > +module_platform_driver(mxs_lradc_ts_driver);
> > +
>
> MODULE_DESCRIPTION ?
> MODULE_AUTHOR ?
Once Stefan's comments addressed please add
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
so that it can be merged through MFD tree.
>
> > +MODULE_LICENSE("GPL");
> > --
> > 1.9.1
> >
Thanks.
--
Dmitry
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2016-06-23 17:24 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-06-08 14:43 [PATCH v2 0/4] mxs-lradc: Split driver into MFD Ksenija Stanojevic
2016-06-08 14:45 ` [PATCH v2 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
2016-06-11 15:32 ` Jonathan Cameron
2016-06-15 21:17 ` Stefan Wahren
2016-06-08 14:47 ` [PATCH v2 2/4] iio: adc: mxs-lradc: Add support for adc driver Ksenija Stanojevic
2016-06-11 15:48 ` Jonathan Cameron
2016-06-08 14:48 ` [PATCH v2 3/4] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
2016-06-15 21:26 ` Stefan Wahren
2016-06-23 17:24 ` Dmitry Torokhov
2016-06-08 14:49 ` [PATCH v2 4/4] iio: adc: mxs-lradc: Remove driver Ksenija Stanojevic
2016-06-11 15:50 ` Jonathan Cameron
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