* [PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD
2016-12-08 22:27 [PATCH v11 0/5] mxs-lradc: Split driver into MFD Ksenija Stanojevic
@ 2016-12-08 22:27 ` Ksenija Stanojevic
2016-12-08 22:56 ` Marek Vasut
2016-12-08 22:27 ` [PATCH v11 2/5] iio: adc: mxs-lradc: Add support for adc driver Ksenija Stanojevic
` (4 subsequent siblings)
5 siblings, 1 reply; 14+ messages in thread
From: Ksenija Stanojevic @ 2016-12-08 22:27 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 low resolution analog-to-digital converter (mxs-lradc)
MFD driver.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
Changes in v11:
- create static struct mfd_cells
- don't set platform data in mfd cells, set driver data instead
- remove mxs_lradc_reg_* functions, use writel function instead
Changes in v10:
- fetch base address from DT
- add a NULL check for of_match_device
Changes in v9:
- improve commit message.
Changes in v8:
- rebase onto 4.9-rc1
Changes in v7:
- define macros ADC_CELL and TSC_CELL
- remove one cell and dynamically set them in the switch()
- fail in the touchscreen driver instead of mfd driver if
hardware doesn't contain a touchscreen
Changes in v6:
- update copyright
- add kernel-doc header for struct mxs-lradc
- add error message
- change EINVAL to ENODEV
- use PLATFORM_DEVID_NONE instead -1
- cosmetic fixes
Changes in v5:
- use DEFINE_RES_MEM
- don't pass ioreammaped adress to platform cells
- move comment outside of struct mxs_lradc
- change type of argument in mxs_lradc_reg_set, mxs_lradc_reg_clear,
mxs_lradc_reg_wrt (struct mxs_lradc * -> void __iomem *)
Changes in v4:
- update copyright
- use DEFINE_RES_IRQ_NAMED
- remove mxs_lradc_add_device function
- use struct mfd_cell in static form
- improve spacing
- remove unnecessary comment
- remove platform_get_irq
- remove touch_ret and use ret instead
- rename use_touchscreen to touchscreen_wire
- use goto statements
- remove irq[13], irq_count and irq_name from struct mxs_lradc
- remove all defines from inside the struct definition
Changes in v3:
- add note to commit message
- move switch statement into if(touch_ret == 0) branch
- add MODULE_AUTHOR
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 | 264 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/mxs-lradc.h | 187 ++++++++++++++++++++++++++++++
4 files changed, 469 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 819dc0a..e5c1289 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -343,6 +343,23 @@ 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_MX25_TSADC
tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
select REGMAP_MMIO
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index db39377..90e9f36 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -212,3 +212,4 @@ obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc.o
+obj-$(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..e29ff55
--- /dev/null
+++ b/drivers/mfd/mxs-lradc.c
@@ -0,0 +1,264 @@
+/*
+ * Freescale MXS Low Resolution Analog-to-Digital Converter driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * Authors:
+ * 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>
+
+#define ADC_CELL 0
+#define TSC_CELL 1
+#define RES_MEM 0
+
+enum mx23_lradc_irqs {
+ MX23_LRADC_TS_IRQ = 0,
+ MX23_LRADC_CH0_IRQ,
+ MX23_LRADC_CH1_IRQ,
+ MX23_LRADC_CH2_IRQ,
+ MX23_LRADC_CH3_IRQ,
+ MX23_LRADC_CH4_IRQ,
+ MX23_LRADC_CH5_IRQ,
+ MX23_LRADC_CH6_IRQ,
+ MX23_LRADC_CH7_IRQ,
+};
+
+enum mx28_lradc_irqs {
+ MX28_LRADC_TS_IRQ = 0,
+ MX28_LRADC_TRESH0_IRQ,
+ MX28_LRADC_TRESH1_IRQ,
+ MX28_LRADC_CH0_IRQ,
+ MX28_LRADC_CH1_IRQ,
+ MX28_LRADC_CH2_IRQ,
+ MX28_LRADC_CH3_IRQ,
+ MX28_LRADC_CH4_IRQ,
+ MX28_LRADC_CH5_IRQ,
+ MX28_LRADC_CH6_IRQ,
+ MX28_LRADC_CH7_IRQ,
+ MX28_LRADC_BUTTON0_IRQ,
+ MX28_LRADC_BUTTON1_IRQ,
+};
+
+static struct resource mx23_adc_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
+};
+
+static struct resource mx23_touchscreen_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
+ DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
+};
+
+static struct resource mx28_adc_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
+};
+
+static struct resource mx28_touchscreen_resources[] = {
+ DEFINE_RES_MEM(0x0, 0x0),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
+ DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
+};
+
+static struct mfd_cell mx23_cells[] = {
+ {
+ .name = "mxs-lradc-adc",
+ .resources = mx23_adc_resources,
+ .num_resources = ARRAY_SIZE(mx23_adc_resources),
+ },
+ {
+ .name = "mxs-lradc-ts",
+ .resources = mx23_touchscreen_resources,
+ .num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
+ },
+};
+
+static struct mfd_cell mx28_cells[] = {
+ {
+ .name = "mxs-lradc-adc",
+ .resources = mx28_adc_resources,
+ .num_resources = ARRAY_SIZE(mx28_adc_resources),
+ },
+ {
+ .name = "mxs-lradc-ts",
+ .resources = mx28_touchscreen_resources,
+ .num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
+ }
+};
+
+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(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id;
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct mxs_lradc *lradc;
+ struct mfd_cell *cells = NULL;
+ struct resource *res;
+ int ret = 0;
+ u32 ts_wires = 0;
+
+ lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
+ if (!lradc)
+ return -ENOMEM;
+
+ of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
+ if (!of_id)
+ return -EINVAL;
+
+ lradc->soc = (enum mxs_lradc_id)of_id->data;
+
+ 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) {
+ dev_err(dev, "Failed to enable the delay unit clock\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+
+ if (!ret) {
+ lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
+
+ switch (ts_wires) {
+ case 4:
+ lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
+ break;
+ case 5:
+ if (lradc->soc == IMX28_LRADC) {
+ lradc->touchscreen_wire =
+ MXS_LRADC_TOUCHSCREEN_5WIRE;
+ break;
+ }
+ /* fall through to an error message for i.MX23 */
+ default:
+ dev_err(&pdev->dev,
+ "Unsupported number of touchscreen wires (%d)\n"
+ , ts_wires);
+ ret = -EINVAL;
+ goto err_clk;
+ }
+ } else {
+ lradc->buffer_vchans = BUFFER_VCHANS_ALL;
+ }
+
+ platform_set_drvdata(pdev, lradc);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOMEM;
+
+ switch (lradc->soc) {
+ case IMX23_LRADC:
+ mx23_adc_resources[RES_MEM] = *res;
+ mx23_touchscreen_resources[RES_MEM] = *res;
+ cells = mx23_cells;
+ break;
+ case IMX28_LRADC:
+ mx28_adc_resources[RES_MEM] = *res;
+ mx28_touchscreen_resources[RES_MEM] = *res;
+ cells = mx28_cells;
+ break;
+ default:
+ dev_err(dev, "Unsupported SoC\n");
+ ret = -ENODEV;
+ goto err_clk;
+ }
+
+ ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+ &cells[ADC_CELL], 1, NULL, 0, NULL);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
+ goto err_clk;
+ }
+
+ ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+ &cells[TSC_CELL], 1, NULL, 0, NULL);
+ 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_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
+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..7bb924d
--- /dev/null
+++ b/include/linux/mfd/mxs-lradc.h
@@ -0,0 +1,187 @@
+/*
+ * Freescale MXS Low Resolution Analog-to-Digital Converter driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * Author: 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 __MFD_MXS_LRADC_H
+#define __MFD_MXS_LRADC_H
+
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/stmp_device.h>
+
+#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)
+
+#define BUFFER_VCHANS_LIMITED 0x3f
+#define BUFFER_VCHANS_ALL 0xff
+
+ /*
+ * 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_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
+ * @soc: soc type (IMX23 or IMX28)
+ * @clk: 2 kHz clock for delay units
+ * @buffer_vchans: channels that can be used during buffered capture
+ * @touchscreen_wire: touchscreen type (4-wire or 5-wire)
+ * @use_touchbutton: button state (on or off)
+ */
+struct mxs_lradc {
+ enum mxs_lradc_id soc;
+ struct clk *clk;
+ u8 buffer_vchans;
+
+ enum mxs_lradc_ts_wires touchscreen_wire;
+ bool use_touchbutton;
+};
+
+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] 14+ messages in thread* Re: [PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD
2016-12-08 22:27 ` [PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
@ 2016-12-08 22:56 ` Marek Vasut
2017-01-04 10:33 ` Lee Jones
0 siblings, 1 reply; 14+ messages in thread
From: Marek Vasut @ 2016-12-08 22:56 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, linux-iio, harald, stefan.wahren, fabio.estevam
On 12/08/2016 11:27 PM, Ksenija Stanojevic wrote:
> Add core files for low resolution analog-to-digital converter (mxs-lradc)
> MFD driver.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Just a nit below.
> +++ b/include/linux/mfd/mxs-lradc.h
> @@ -0,0 +1,187 @@
> +/*
[...]
> +#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))
This would turn into BIT(n) , no ?
> +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> +#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
[...]
--
Best regards,
Marek Vasut
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD
2016-12-08 22:56 ` Marek Vasut
@ 2017-01-04 10:33 ` Lee Jones
0 siblings, 0 replies; 14+ messages in thread
From: Lee Jones @ 2017-01-04 10:33 UTC (permalink / raw)
To: Marek Vasut
Cc: Ksenija Stanojevic, linux-kernel, dmitry.torokhov, linux-input,
jic23, knaack.h, lars, pmeerw, linux-iio, harald, stefan.wahren,
fabio.estevam
On Thu, 08 Dec 2016, Marek Vasut wrote:
> On 12/08/2016 11:27 PM, Ksenija Stanojevic wrote:
> > Add core files for low resolution analog-to-digital converter (mxs-lradc)
> > MFD driver.
> >
> > Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
>
> Just a nit below.
>
> > +++ b/include/linux/mfd/mxs-lradc.h
> > @@ -0,0 +1,187 @@
> > +/*
>
> [...]
>
> > +#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))
>
> This would turn into BIT(n) , no ?
Once you have fixed this, you can apply my:
For my own reference:
Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
> > +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
> > +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
> > +#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
>
> [...]
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH v11 2/5] iio: adc: mxs-lradc: Add support for adc driver
2016-12-08 22:27 [PATCH v11 0/5] mxs-lradc: Split driver into MFD Ksenija Stanojevic
2016-12-08 22:27 ` [PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
@ 2016-12-08 22:27 ` Ksenija Stanojevic
2016-12-08 22:27 ` [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
` (3 subsequent siblings)
5 siblings, 0 replies; 14+ messages in thread
From: Ksenija Stanojevic @ 2016-12-08 22:27 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>
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
---
Changes in v11:
- use dev_get_drvdata instead dev_get_platdata
- use writel instead mxs_lradc_reg_* functions
Changes in v10:
- none
Changes in v9:
- none
Changes in v8:
- rebase onto 4.9-rc1
Changes in v7:
- none
Changes in v6:
- update copyright
Changes in v5:
- add field void __iomem *base to struct mxs_lradc_adc
- change arguments in all functions for accessing I/O memory
to follow the previous change.
- use devm_ioremap for mapping I/O memory
Changes in v4:
- update copyright
- use platform_get_irq_byname
- use irq_of_parse_and_map
Changes in v3:
- make buffer large enough for timestamps
- remove unnecessary blank lines
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 | 843 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 857 insertions(+)
create mode 100644 drivers/iio/adc/mxs-lradc-adc.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 57ebb99..ad6046a 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -219,6 +219,19 @@ 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 FSL_MX25_ADC
tristate "Freescale MX25 ADC driver"
depends on MFD_MX25_TSADC
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 96894b3..4b2cf9b 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_MCP3422) += mcp3422.o
obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
obj-$(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..5d7179e
--- /dev/null
+++ b/drivers/iio/adc/mxs-lradc-adc.c
@@ -0,0 +1,843 @@
+/*
+ * Freescale MXS LRADC ADC driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * Authors:
+ * 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/of_irq.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
+
+const char *mx23_lradc_adc_irq_names[] = {
+ "mxs-lradc-channel0",
+ "mxs-lradc-channel1",
+ "mxs-lradc-channel2",
+ "mxs-lradc-channel3",
+ "mxs-lradc-channel4",
+ "mxs-lradc-channel5",
+};
+
+const char *mx28_lradc_adc_irq_names[] = {
+ "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-button0",
+ "mxs-lradc-button1",
+};
+
+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;
+
+ void __iomem *base;
+ u32 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)
+ writel(LRADC_CTRL1_LRADC_IRQ_EN(0),
+ adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(0x1, adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+
+ /* Enable / disable the divider per requirement */
+ if (test_bit(chan, &adc->is_divided))
+ writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ adc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET);
+ else
+ writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ adc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR);
+
+ /* Clean the slot's previous content, then set new one. */
+ writel(LRADC_CTRL4_LRADCSELECT_MASK(0),
+ adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR);
+ writel(chan, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET);
+
+ writel(0, adc->base + LRADC_CH(0));
+
+ /* Enable the IRQ and start sampling the channel. */
+ writel(LRADC_CTRL1_LRADC_IRQ_EN(0),
+ adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+ writel(BIT(0), adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ /* 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(adc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
+ ret = IIO_VAL_INT;
+
+err:
+ writel(LRADC_CTRL1_LRADC_IRQ_EN(0),
+ adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ 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(adc->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);
+ }
+
+ writel(reg & mxs_lradc_irq_mask(lradc),
+ adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ 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->base + LRADC_CH(j));
+ writel(chan_value, adc->base + 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;
+
+ writel(LRADC_DELAY_KICK, adc->base + (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)
+ writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(lradc->buffer_vchans,
+ adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+
+ 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);
+ writel(chan_value, adc->base + LRADC_CH(ofs));
+ bitmap_set(&enable, ofs, 1);
+ ofs++;
+ }
+
+ writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK,
+ adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR);
+ writel(ctrl4_clr, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR);
+ writel(ctrl4_set, adc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET);
+ writel(ctrl1_irq, adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+ writel(enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
+ adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_SET);
+
+ 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;
+
+ writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK,
+ adc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR);
+
+ writel(lradc->buffer_vchans,
+ adc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ if (lradc->soc == IMX28_LRADC)
+ writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ adc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ 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->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_4WIRE)
+ rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
+ if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE)
+ rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
+
+ if (lradc->use_touchbutton)
+ rsvd_chans++;
+ if (lradc->touchscreen_wire)
+ 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)
+{
+ /* 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. */
+ writel(adc_cfg, adc->base + LRADC_DELAY(0));
+
+ /*
+ * Start internal temperature sensing by clearing bit
+ * HW_LRADC_CTRL2_TEMPSENSE_PWD. This bit can be left cleared
+ * after power up.
+ */
+ writel(0, adc->base + LRADC_CTRL2);
+}
+
+static void mxs_lradc_adc_hw_stop(struct mxs_lradc_adc *adc)
+{
+ writel(0, adc->base + LRADC_DELAY(0));
+}
+
+static int mxs_lradc_adc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mxs_lradc *lradc = dev_get_drvdata(dev->parent);
+ struct mxs_lradc_adc *adc;
+ struct iio_dev *iio;
+ struct resource *iores;
+ int ret, irq, virq, i, s, n;
+ u64 scale_uv;
+ const char **irq_name;
+
+ /* 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;
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ adc->base = devm_ioremap(dev, iores->start, resource_size(iores));
+ if (IS_ERR(adc->base))
+ return PTR_ERR(adc->base);
+
+ 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_name = mx23_lradc_adc_irq_names;
+ n = ARRAY_SIZE(mx23_lradc_adc_irq_names);
+ } else {
+ iio->channels = mx28_lradc_chan_spec;
+ iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
+ irq_name = mx28_lradc_adc_irq_names;
+ n = ARRAY_SIZE(mx28_lradc_adc_irq_names);
+ }
+
+ ret = stmp_reset_block(adc->base);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < n; i++) {
+ irq = platform_get_irq_byname(pdev, irq_name[i]);
+ if (irq < 0)
+ return irq;
+
+ virq = irq_of_parse_and_map(dev->parent->of_node, irq);
+
+ ret = devm_request_irq(dev, virq, mxs_lradc_adc_handle_irq,
+ 0, irq_name[i], 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 = "mxs-lradc-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:mxs-lradc-adc");
--
1.9.1
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-12-08 22:27 [PATCH v11 0/5] mxs-lradc: Split driver into MFD Ksenija Stanojevic
2016-12-08 22:27 ` [PATCH v11 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD Ksenija Stanojevic
2016-12-08 22:27 ` [PATCH v11 2/5] iio: adc: mxs-lradc: Add support for adc driver Ksenija Stanojevic
@ 2016-12-08 22:27 ` Ksenija Stanojevic
2016-12-27 22:39 ` Dmitry Torokhov
2016-12-08 22:27 ` [PATCH v11 4/5] iio: adc: mxs-lradc: Remove driver Ksenija Stanojevic
` (2 subsequent siblings)
5 siblings, 1 reply; 14+ messages in thread
From: Ksenija Stanojevic @ 2016-12-08 22:27 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 v11:
- use dev_get_drvdata instead dev_get_platdata
- use writel instead mxs_lradc_reg_* functions
Changes in v10:
- none
Changes in v9:
- none
Changes in v8:
- rebase onto 4.9-rc1
Changes in v7:
- remove touch_ret variable in probe and use ret instead
- make error check on of_property_read_u32 in probe
Changes in v6:
- update copyright
Changes in v5:
- add field void __iomem *base to struct mxs_lradc_adc
- change arguments in all functions for accessing I/O memory
to follow the previous change.
- use devm_ioremap for mapping I/O memory
Changes in v4:
- update copyright
- use platform_get_irq_byname
- use irq_of_parse_and_map
Changes in v3:
- make buffer large enough for timestamps
- remove unnecessary blank lines
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/input/touchscreen/Kconfig | 10 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/mxs-lradc-ts.c | 739 +++++++++++++++++++++++++++++++
3 files changed, 750 insertions(+)
create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index efca013..8ff915e 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -841,6 +841,16 @@ config TOUCHSCREEN_USB_COMPOSITE
To compile this driver as a module, choose M here: the
module will be called usbtouchscreen.
+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_MX25
tristate "Freescale i.MX25 touchscreen input driver"
depends on MFD_MX25_TSADC
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 81b8645..97e1bb7 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
+obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC) += mxs-lradc-ts.o
obj-$(CONFIG_TOUCHSCREEN_MX25) += fsl-imx25-tcq.o
obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
obj-$(CONFIG_TOUCHSCREEN_MCS5000) += mcs5000_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..a222e35
--- /dev/null
+++ b/drivers/input/touchscreen/mxs-lradc-ts.c
@@ -0,0 +1,739 @@
+/*
+ * Freescale MXS LRADC touchscreen driver
+ *
+ * Copyright (c) 2012 DENX Software Engineering, GmbH.
+ * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
+ *
+ * Authors:
+ * 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/of_irq.h>
+#include <linux/platform_device.h>
+
+const char *mxs_lradc_ts_irq_names[] = {
+ "mxs-lradc-touchscreen",
+ "mxs-lradc-channel6",
+ "mxs-lradc-channel7",
+};
+
+/*
+ * 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;
+
+ void __iomem *base;
+ /*
+ * 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_ts *ts)
+{
+ return !!(readl(ts->base + LRADC_STATUS) &
+ LRADC_STATUS_TOUCH_DETECT_RAW);
+}
+
+static void mxs_lradc_map_ts_channel(struct mxs_lradc_ts *ts, unsigned int vch,
+ unsigned int ch)
+{
+ writel(LRADC_CTRL4_LRADCSELECT_MASK(vch),
+ ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL4_LRADCSELECT(vch, ch),
+ ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET);
+}
+
+static void mxs_lradc_setup_ts_channel(struct mxs_lradc_ts *ts, unsigned int 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."
+ */
+ writel(LRADC_CH_ACCUMULATE |
+ LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1),
+ ts->base + LRADC_CH(ch));
+
+ /* from the datasheet:
+ * "Software must clear this register in preparation for a
+ * multi-cycle accumulation.
+ */
+ writel(LRADC_CH_VALUE_MASK,
+ ts->base + LRADC_CH(ch) + STMP_OFFSET_REG_CLR);
+
+ /*
+ * 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."
+ */
+ writel(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),
+ ts->base + LRADC_DELAY(3));
+
+ writel(LRADC_CTRL1_LRADC_IRQ(ch),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ /*
+ * 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.
+ */
+ writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
+ ts->base + 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)
+{
+ 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);
+ writel(reg, ts->base + LRADC_CH(ch1));
+ writel(reg, ts->base + LRADC_CH(ch2));
+
+ /* from the datasheet:
+ * "Software must clear this register in preparation for a
+ * multi-cycle accumulation.
+ */
+ writel(LRADC_CH_VALUE_MASK,
+ ts->base + LRADC_CH(ch1) + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CH_VALUE_MASK,
+ ts->base + LRADC_CH(ch2) + STMP_OFFSET_REG_CLR);
+
+ /* prepare the delay/loop unit according to the oversampling count */
+ writel(LRADC_DELAY_TRIGGER(1 << ch1) | LRADC_DELAY_TRIGGER(1 << ch2) |
+ LRADC_DELAY_TRIGGER_DELAYS(0) |
+ LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) |
+ LRADC_DELAY_DELAY(ts->over_sample_delay - 1),
+ ts->base + LRADC_DELAY(3));
+
+ writel(LRADC_CTRL1_LRADC_IRQ(ch2),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ /*
+ * 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.
+ */
+ writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
+ ts->base + 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;
+
+ reg = readl(ts->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;
+
+ mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
+ reg = readl(ts->base + LRADC_CTRL1) & mask;
+
+ while (reg != mask) {
+ reg = readl(ts->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
+ */
+ writel(mxs_lradc_plate_mask(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(mxs_lradc_touch_detect_bit(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+}
+
+/*
+ * 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;
+
+ writel(mxs_lradc_plate_mask(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(mxs_lradc_drive_x_plate(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ ts->cur_plate = LRADC_SAMPLE_X;
+ mxs_lradc_map_ts_channel(ts, 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;
+
+ writel(mxs_lradc_plate_mask(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(mxs_lradc_drive_y_plate(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ ts->cur_plate = LRADC_SAMPLE_Y;
+ mxs_lradc_map_ts_channel(ts, 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;
+
+ writel(mxs_lradc_plate_mask(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+ writel(mxs_lradc_drive_pressure(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+
+ ts->cur_plate = LRADC_SAMPLE_PRESSURE;
+ mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
+ mxs_lradc_map_ts_channel(ts, 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;
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+}
+
+static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts)
+{
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+ /*
+ * 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)
+{
+ 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
+ */
+ writel(0, ts->base + LRADC_CH(TOUCHSCREEN_VCHANNEL1));
+ writel(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
+ LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10),
+ ts->base + 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)
+{
+ /* if it is still touched, report the sample */
+ if (valid && mxs_lradc_check_touch_event(ts)) {
+ 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(ts)) {
+ 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;
+ writel(0, ts->base + LRADC_DELAY(2));
+ writel(0, ts->base + LRADC_DELAY(3));
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
+}
+
+/* touchscreen's state machine */
+static void mxs_lradc_handle_touch(struct mxs_lradc_ts *ts)
+{
+ switch (ts->cur_plate) {
+ case LRADC_TOUCH:
+ if (mxs_lradc_check_touch_event(ts))
+ mxs_lradc_start_touch_event(ts);
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ 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(ts->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));
+ writel(reg & clr_irq,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+ }
+
+ 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 */
+ writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
+ LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2),
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ /* Power-down touchscreen touch-detect circuitry. */
+ writel(mxs_lradc_plate_mask(lradc),
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+
+ writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+ ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
+
+ for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++)
+ writel(0, ts->base + 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) {
+ writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
+
+ if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE)
+ writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
+ ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
+ }
+}
+
+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 = "mxs-lradc-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_drvdata(dev->parent);
+ struct mxs_lradc_ts *ts;
+ struct resource *iores;
+ int ret, irq, virq, i;
+ u32 ts_wires = 0, adapt;
+
+ 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);
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ts->base = devm_ioremap(dev, iores->start, resource_size(iores));
+ if (IS_ERR(ts->base))
+ return PTR_ERR(ts->base);
+
+ ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
+ &ts_wires);
+ if (ret)
+ return ret;
+
+ 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;
+ }
+ }
+
+ ret = stmp_reset_block(ts->base);
+ if (ret)
+ return ret;
+
+ mxs_lradc_ts_hw_init(ts);
+
+ for (i = 0; i < 3; i++) {
+ irq = platform_get_irq_byname(pdev, mxs_lradc_ts_irq_names[i]);
+ if (irq < 0)
+ return irq;
+
+ virq = irq_of_parse_and_map(node, irq);
+
+ ret = devm_request_irq(dev, virq,
+ mxs_lradc_ts_handle_irq,
+ 0, mxs_lradc_ts_irq_names[i], ts);
+ if (ret)
+ return 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 = "mxs-lradc-ts",
+ },
+ .probe = mxs_lradc_ts_probe,
+};
+module_platform_driver(mxs_lradc_ts_driver);
+
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
+MODULE_DESCRIPTION("Freescale MXS LRADC touchscreen driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-lradc-ts");
--
1.9.1
^ permalink raw reply related [flat|nested] 14+ messages in thread* Re: [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-12-08 22:27 ` [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
@ 2016-12-27 22:39 ` Dmitry Torokhov
2017-01-20 12:25 ` Stefan Wahren
2017-01-23 10:53 ` Ksenija Stanojević
0 siblings, 2 replies; 14+ messages in thread
From: Dmitry Torokhov @ 2016-12-27 22:39 UTC (permalink / raw)
To: Ksenija Stanojevic
Cc: linux-kernel, lee.jones, linux-input, jic23, knaack.h, lars,
pmeerw, marex, linux-iio, harald, stefan.wahren, fabio.estevam
Hi Ksenija,
On Thu, Dec 08, 2016 at 11:27:09PM +0100, Ksenija Stanojevic wrote:
> Add 4-wire/5-wire touchscreen controller.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> ---
> Changes in v11:
> - use dev_get_drvdata instead dev_get_platdata
> - use writel instead mxs_lradc_reg_* functions
>
> Changes in v10:
> - none
>
> Changes in v9:
> - none
>
> Changes in v8:
> - rebase onto 4.9-rc1
>
> Changes in v7:
> - remove touch_ret variable in probe and use ret instead
> - make error check on of_property_read_u32 in probe
>
> Changes in v6:
> - update copyright
>
> Changes in v5:
> - add field void __iomem *base to struct mxs_lradc_adc
> - change arguments in all functions for accessing I/O memory
> to follow the previous change.
> - use devm_ioremap for mapping I/O memory
>
> Changes in v4:
> - update copyright
> - use platform_get_irq_byname
> - use irq_of_parse_and_map
>
> Changes in v3:
> - make buffer large enough for timestamps
> - remove unnecessary blank lines
>
> 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/input/touchscreen/Kconfig | 10 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/mxs-lradc-ts.c | 739 +++++++++++++++++++++++++++++++
> 3 files changed, 750 insertions(+)
> create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
>
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index efca013..8ff915e 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -841,6 +841,16 @@ config TOUCHSCREEN_USB_COMPOSITE
> To compile this driver as a module, choose M here: the
> module will be called usbtouchscreen.
>
> +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_MX25
> tristate "Freescale i.MX25 touchscreen input driver"
> depends on MFD_MX25_TSADC
> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> index 81b8645..97e1bb7 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
> obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
> obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
> obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
> +obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC) += mxs-lradc-ts.o
> obj-$(CONFIG_TOUCHSCREEN_MX25) += fsl-imx25-tcq.o
> obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
> obj-$(CONFIG_TOUCHSCREEN_MCS5000) += mcs5000_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..a222e35
> --- /dev/null
> +++ b/drivers/input/touchscreen/mxs-lradc-ts.c
> @@ -0,0 +1,739 @@
> +/*
> + * Freescale MXS LRADC touchscreen driver
> + *
> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
> + * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> + *
> + * Authors:
> + * 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/of_irq.h>
> +#include <linux/platform_device.h>
> +
> +const char *mxs_lradc_ts_irq_names[] = {
> + "mxs-lradc-touchscreen",
> + "mxs-lradc-channel6",
> + "mxs-lradc-channel7",
> +};
> +
> +/*
> + * 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;
> +
> + void __iomem *base;
> + /*
> + * 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;
I wonder if, instead of doing conditionals on every operation, you could
attach const struct pointer to your device with needed values/masks.
> +}
> +
> +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_ts *ts)
> +{
> + return !!(readl(ts->base + LRADC_STATUS) &
> + LRADC_STATUS_TOUCH_DETECT_RAW);
> +}
> +
> +static void mxs_lradc_map_ts_channel(struct mxs_lradc_ts *ts, unsigned int vch,
> + unsigned int ch)
> +{
> + writel(LRADC_CTRL4_LRADCSELECT_MASK(vch),
> + ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR);
> + writel(LRADC_CTRL4_LRADCSELECT(vch, ch),
> + ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET);
> +}
> +
> +static void mxs_lradc_setup_ts_channel(struct mxs_lradc_ts *ts, unsigned int 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."
> + */
> + writel(LRADC_CH_ACCUMULATE |
> + LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1),
> + ts->base + LRADC_CH(ch));
> +
> + /* from the datasheet:
> + * "Software must clear this register in preparation for a
> + * multi-cycle accumulation.
> + */
> + writel(LRADC_CH_VALUE_MASK,
> + ts->base + LRADC_CH(ch) + STMP_OFFSET_REG_CLR);
> +
> + /*
> + * 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."
> + */
> + writel(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),
> + ts->base + LRADC_DELAY(3));
> +
> + writel(LRADC_CTRL1_LRADC_IRQ(ch),
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> +
> + /*
> + * 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.
> + */
> + writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
> + ts->base + 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)
> +{
> + 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);
> + writel(reg, ts->base + LRADC_CH(ch1));
> + writel(reg, ts->base + LRADC_CH(ch2));
> +
> + /* from the datasheet:
> + * "Software must clear this register in preparation for a
> + * multi-cycle accumulation.
> + */
> + writel(LRADC_CH_VALUE_MASK,
> + ts->base + LRADC_CH(ch1) + STMP_OFFSET_REG_CLR);
> + writel(LRADC_CH_VALUE_MASK,
> + ts->base + LRADC_CH(ch2) + STMP_OFFSET_REG_CLR);
> +
> + /* prepare the delay/loop unit according to the oversampling count */
> + writel(LRADC_DELAY_TRIGGER(1 << ch1) | LRADC_DELAY_TRIGGER(1 << ch2) |
> + LRADC_DELAY_TRIGGER_DELAYS(0) |
> + LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) |
> + LRADC_DELAY_DELAY(ts->over_sample_delay - 1),
> + ts->base + LRADC_DELAY(3));
> +
> + writel(LRADC_CTRL1_LRADC_IRQ(ch2),
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> +
> + /*
> + * 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.
> + */
> + writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
> + ts->base + 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;
> +
> + reg = readl(ts->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;
> +
> + mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
> + reg = readl(ts->base + LRADC_CTRL1) & mask;
> +
> + while (reg != mask) {
> + reg = readl(ts->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
> + */
> + writel(mxs_lradc_plate_mask(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
> + writel(mxs_lradc_touch_detect_bit(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
> +}
> +
> +/*
> + * 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;
> +
> + writel(mxs_lradc_plate_mask(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
> + writel(mxs_lradc_drive_x_plate(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
> +
> + ts->cur_plate = LRADC_SAMPLE_X;
> + mxs_lradc_map_ts_channel(ts, 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;
> +
> + writel(mxs_lradc_plate_mask(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
> + writel(mxs_lradc_drive_y_plate(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
> +
> + ts->cur_plate = LRADC_SAMPLE_Y;
> + mxs_lradc_map_ts_channel(ts, 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;
> +
> + writel(mxs_lradc_plate_mask(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
> + writel(mxs_lradc_drive_pressure(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
> +
> + ts->cur_plate = LRADC_SAMPLE_PRESSURE;
> + mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
> + mxs_lradc_map_ts_channel(ts, 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;
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
> +}
> +
> +static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts)
> +{
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> + writel(LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
> + /*
> + * 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)
> +{
> + 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
> + */
> + writel(0, ts->base + LRADC_CH(TOUCHSCREEN_VCHANNEL1));
> + writel(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> + writel(LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10),
> + ts->base + 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)
> +{
> + /* if it is still touched, report the sample */
> + if (valid && mxs_lradc_check_touch_event(ts)) {
> + 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(ts)) {
> + 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;
> + writel(0, ts->base + LRADC_DELAY(2));
> + writel(0, ts->base + LRADC_DELAY(3));
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
> +}
> +
> +/* touchscreen's state machine */
> +static void mxs_lradc_handle_touch(struct mxs_lradc_ts *ts)
> +{
> + switch (ts->cur_plate) {
> + case LRADC_TOUCH:
> + if (mxs_lradc_check_touch_event(ts))
> + mxs_lradc_start_touch_event(ts);
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> + 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(ts->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));
> + writel(reg & clr_irq,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> + }
> +
> + 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 */
> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2),
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> +
> + /* Power-down touchscreen touch-detect circuitry. */
> + writel(mxs_lradc_plate_mask(lradc),
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
> +
> + writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
> +
> + for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++)
> + writel(0, ts->base + 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) {
> + writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
> +
> + if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE)
> + writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
> + }
> +}
> +
> +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 = "mxs-lradc-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_drvdata(dev->parent);
> + struct mxs_lradc_ts *ts;
> + struct resource *iores;
> + int ret, irq, virq, i;
> + u32 ts_wires = 0, adapt;
> +
> + 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);
> +
> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ts->base = devm_ioremap(dev, iores->start, resource_size(iores));
> + if (IS_ERR(ts->base))
> + return PTR_ERR(ts->base);
> +
> + ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
> + &ts_wires);
> + if (ret)
> + return ret;
> +
> + 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;
> + }
> + }
> +
> + ret = stmp_reset_block(ts->base);
> + if (ret)
> + return ret;
> +
> + mxs_lradc_ts_hw_init(ts);
> +
> + for (i = 0; i < 3; i++) {
> + irq = platform_get_irq_byname(pdev, mxs_lradc_ts_irq_names[i]);
> + if (irq < 0)
> + return irq;
> +
> + virq = irq_of_parse_and_map(node, irq);
Why do we need this? I'd expect parent to fully prepare interrupts for
the child to use. I.e. I'd expect I could do platform_get_irq_byname()
and them go straight to devm_request_irq().
> +
> + ret = devm_request_irq(dev, virq,
> + mxs_lradc_ts_handle_irq,
> + 0, mxs_lradc_ts_irq_names[i], ts);
> + if (ret)
> + return ret;
> + }
> +
> + ret = mxs_lradc_ts_register(ts);
> + if (!ret)
> + goto error;
> +
> + return 0;
> +
> +error:
> + mxs_lradc_ts_stop(ts);
Why do you want to stop only if mxs_lradc_ts_register() fails? If open()
has been called, then close() should be called on error automatically.
That said, shouldn't you call mxs_lradc_ts_stop() before requesting
interrupts, just to make sure they do not start firing early (even
though I think it should be safe if they do)?
Thanks.
> +
> + return ret;
> +}
> +
> +static struct platform_driver mxs_lradc_ts_driver = {
> + .driver = {
> + .name = "mxs-lradc-ts",
> + },
> + .probe = mxs_lradc_ts_probe,
> +};
> +module_platform_driver(mxs_lradc_ts_driver);
> +
> +MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
> +MODULE_DESCRIPTION("Freescale MXS LRADC touchscreen driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:mxs-lradc-ts");
> --
> 1.9.1
>
--
Dmitry
^ permalink raw reply [flat|nested] 14+ messages in thread* Re: [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-12-27 22:39 ` Dmitry Torokhov
@ 2017-01-20 12:25 ` Stefan Wahren
2017-01-21 20:57 ` Ksenija Stanojević
2017-01-23 10:53 ` Ksenija Stanojević
1 sibling, 1 reply; 14+ messages in thread
From: Stefan Wahren @ 2017-01-20 12:25 UTC (permalink / raw)
To: Ksenija Stanojevic
Cc: Dmitry Torokhov, linux-kernel, lee.jones, linux-input, jic23,
knaack.h, lars, pmeerw, marex, linux-iio, harald, Fabio Estevam
Hi Ksenija,
[updated Fabio's mail address]
thanks for all your work on that driver.
Do you plan to submit a V13 of this patch series to address Dmitry's notes?
Best regards
Stefan
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen
2017-01-20 12:25 ` Stefan Wahren
@ 2017-01-21 20:57 ` Ksenija Stanojević
0 siblings, 0 replies; 14+ messages in thread
From: Ksenija Stanojević @ 2017-01-21 20:57 UTC (permalink / raw)
To: Stefan Wahren
Cc: Dmitry Torokhov, linux-kernel, Lee Jones, linux-input,
Jonathan Cameron, Hartmut Knaack, Lars-Peter Clausen,
Peter Meerwald-Stadler, Marek Vasut, linux-iio, Harald Geyer,
Fabio Estevam
Hi Stefan
On Fri, Jan 20, 2017 at 1:25 PM, Stefan Wahren <stefan.wahren@i2se.com> wrote:
>
> Hi Ksenija,
>
> [updated Fabio's mail address]
>
> thanks for all your work on that driver.
>
> Do you plan to submit a V13 of this patch series to address Dmitry's notes?
I've been on holiday for couple of weeks, I will post new version soon.
Ksenija
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen
2016-12-27 22:39 ` Dmitry Torokhov
2017-01-20 12:25 ` Stefan Wahren
@ 2017-01-23 10:53 ` Ksenija Stanojević
1 sibling, 0 replies; 14+ messages in thread
From: Ksenija Stanojević @ 2017-01-23 10:53 UTC (permalink / raw)
To: Dmitry Torokhov
Cc: linux-kernel, Lee Jones, linux-input, Jonathan Cameron,
Hartmut Knaack, Lars-Peter Clausen, Peter Meerwald-Stadler,
Marek Vasut, linux-iio, Harald Geyer, Stefan Wahren,
Fabio Estevam
Hi Dmitry,
On Tue, Dec 27, 2016 at 11:39 PM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> Hi Ksenija,
>
> On Thu, Dec 08, 2016 at 11:27:09PM +0100, Ksenija Stanojevic wrote:
>> Add 4-wire/5-wire touchscreen controller.
>>
>> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
>> ---
>> Changes in v11:
>> - use dev_get_drvdata instead dev_get_platdata
>> - use writel instead mxs_lradc_reg_* functions
>>
>> Changes in v10:
>> - none
>>
>> Changes in v9:
>> - none
>>
>> Changes in v8:
>> - rebase onto 4.9-rc1
>>
>> Changes in v7:
>> - remove touch_ret variable in probe and use ret instead
>> - make error check on of_property_read_u32 in probe
>>
>> Changes in v6:
>> - update copyright
>>
>> Changes in v5:
>> - add field void __iomem *base to struct mxs_lradc_adc
>> - change arguments in all functions for accessing I/O memory
>> to follow the previous change.
>> - use devm_ioremap for mapping I/O memory
>>
>> Changes in v4:
>> - update copyright
>> - use platform_get_irq_byname
>> - use irq_of_parse_and_map
>>
>> Changes in v3:
>> - make buffer large enough for timestamps
>> - remove unnecessary blank lines
>>
>> 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/input/touchscreen/Kconfig | 10 +
>> drivers/input/touchscreen/Makefile | 1 +
>> drivers/input/touchscreen/mxs-lradc-ts.c | 739 +++++++++++++++++++++++++++++++
>> 3 files changed, 750 insertions(+)
>> create mode 100644 drivers/input/touchscreen/mxs-lradc-ts.c
>>
>> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
>> index efca013..8ff915e 100644
>> --- a/drivers/input/touchscreen/Kconfig
>> +++ b/drivers/input/touchscreen/Kconfig
>> @@ -841,6 +841,16 @@ config TOUCHSCREEN_USB_COMPOSITE
>> To compile this driver as a module, choose M here: the
>> module will be called usbtouchscreen.
>>
>> +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_MX25
>> tristate "Freescale i.MX25 touchscreen input driver"
>> depends on MFD_MX25_TSADC
>> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
>> index 81b8645..97e1bb7 100644
>> --- a/drivers/input/touchscreen/Makefile
>> +++ b/drivers/input/touchscreen/Makefile
>> @@ -46,6 +46,7 @@ obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
>> obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
>> obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
>> obj-$(CONFIG_TOUCHSCREEN_MAX11801) += max11801_ts.o
>> +obj-$(CONFIG_TOUCHSCREEN_MXS_LRADC) += mxs-lradc-ts.o
>> obj-$(CONFIG_TOUCHSCREEN_MX25) += fsl-imx25-tcq.o
>> obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
>> obj-$(CONFIG_TOUCHSCREEN_MCS5000) += mcs5000_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..a222e35
>> --- /dev/null
>> +++ b/drivers/input/touchscreen/mxs-lradc-ts.c
>> @@ -0,0 +1,739 @@
>> +/*
>> + * Freescale MXS LRADC touchscreen driver
>> + *
>> + * Copyright (c) 2012 DENX Software Engineering, GmbH.
>> + * Copyright (c) 2016 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
>> + *
>> + * Authors:
>> + * 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/of_irq.h>
>> +#include <linux/platform_device.h>
>> +
>> +const char *mxs_lradc_ts_irq_names[] = {
>> + "mxs-lradc-touchscreen",
>> + "mxs-lradc-channel6",
>> + "mxs-lradc-channel7",
>> +};
>> +
>> +/*
>> + * 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;
>> +
>> + void __iomem *base;
>> + /*
>> + * 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;
>
> I wonder if, instead of doing conditionals on every operation, you could
> attach const struct pointer to your device with needed values/masks.
Ok, I can try that.
>> +}
>> +
>> +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_ts *ts)
>> +{
>> + return !!(readl(ts->base + LRADC_STATUS) &
>> + LRADC_STATUS_TOUCH_DETECT_RAW);
>> +}
>> +
>> +static void mxs_lradc_map_ts_channel(struct mxs_lradc_ts *ts, unsigned int vch,
>> + unsigned int ch)
>> +{
>> + writel(LRADC_CTRL4_LRADCSELECT_MASK(vch),
>> + ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR);
>> + writel(LRADC_CTRL4_LRADCSELECT(vch, ch),
>> + ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET);
>> +}
>> +
>> +static void mxs_lradc_setup_ts_channel(struct mxs_lradc_ts *ts, unsigned int 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."
>> + */
>> + writel(LRADC_CH_ACCUMULATE |
>> + LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1),
>> + ts->base + LRADC_CH(ch));
>> +
>> + /* from the datasheet:
>> + * "Software must clear this register in preparation for a
>> + * multi-cycle accumulation.
>> + */
>> + writel(LRADC_CH_VALUE_MASK,
>> + ts->base + LRADC_CH(ch) + STMP_OFFSET_REG_CLR);
>> +
>> + /*
>> + * 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."
>> + */
>> + writel(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),
>> + ts->base + LRADC_DELAY(3));
>> +
>> + writel(LRADC_CTRL1_LRADC_IRQ(ch),
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> +
>> + /*
>> + * 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.
>> + */
>> + writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
>> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
>> + ts->base + 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)
>> +{
>> + 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);
>> + writel(reg, ts->base + LRADC_CH(ch1));
>> + writel(reg, ts->base + LRADC_CH(ch2));
>> +
>> + /* from the datasheet:
>> + * "Software must clear this register in preparation for a
>> + * multi-cycle accumulation.
>> + */
>> + writel(LRADC_CH_VALUE_MASK,
>> + ts->base + LRADC_CH(ch1) + STMP_OFFSET_REG_CLR);
>> + writel(LRADC_CH_VALUE_MASK,
>> + ts->base + LRADC_CH(ch2) + STMP_OFFSET_REG_CLR);
>> +
>> + /* prepare the delay/loop unit according to the oversampling count */
>> + writel(LRADC_DELAY_TRIGGER(1 << ch1) | LRADC_DELAY_TRIGGER(1 << ch2) |
>> + LRADC_DELAY_TRIGGER_DELAYS(0) |
>> + LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) |
>> + LRADC_DELAY_DELAY(ts->over_sample_delay - 1),
>> + ts->base + LRADC_DELAY(3));
>> +
>> + writel(LRADC_CTRL1_LRADC_IRQ(ch2),
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> +
>> + /*
>> + * 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.
>> + */
>> + writel(LRADC_DELAY_TRIGGER(0) | LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) |
>> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay),
>> + ts->base + 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;
>> +
>> + reg = readl(ts->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;
>> +
>> + mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
>> + reg = readl(ts->base + LRADC_CTRL1) & mask;
>> +
>> + while (reg != mask) {
>> + reg = readl(ts->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
>> + */
>> + writel(mxs_lradc_plate_mask(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>> + writel(mxs_lradc_touch_detect_bit(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
>> +}
>> +
>> +/*
>> + * 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;
>> +
>> + writel(mxs_lradc_plate_mask(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>> + writel(mxs_lradc_drive_x_plate(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
>> +
>> + ts->cur_plate = LRADC_SAMPLE_X;
>> + mxs_lradc_map_ts_channel(ts, 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;
>> +
>> + writel(mxs_lradc_plate_mask(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>> + writel(mxs_lradc_drive_y_plate(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
>> +
>> + ts->cur_plate = LRADC_SAMPLE_Y;
>> + mxs_lradc_map_ts_channel(ts, 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;
>> +
>> + writel(mxs_lradc_plate_mask(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>> + writel(mxs_lradc_drive_pressure(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
>> +
>> + ts->cur_plate = LRADC_SAMPLE_PRESSURE;
>> + mxs_lradc_map_ts_channel(ts, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
>> + mxs_lradc_map_ts_channel(ts, 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;
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ | LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
>> +}
>> +
>> +static void mxs_lradc_start_touch_event(struct mxs_lradc_ts *ts)
>> +{
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> + writel(LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
>> + /*
>> + * 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)
>> +{
>> + 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
>> + */
>> + writel(0, ts->base + LRADC_CH(TOUCHSCREEN_VCHANNEL1));
>> + writel(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
>> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> + writel(LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
>> + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10),
>> + ts->base + 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)
>> +{
>> + /* if it is still touched, report the sample */
>> + if (valid && mxs_lradc_check_touch_event(ts)) {
>> + 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(ts)) {
>> + 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;
>> + writel(0, ts->base + LRADC_DELAY(2));
>> + writel(0, ts->base + LRADC_DELAY(3));
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ |
>> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
>> + LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET);
>> +}
>> +
>> +/* touchscreen's state machine */
>> +static void mxs_lradc_handle_touch(struct mxs_lradc_ts *ts)
>> +{
>> + switch (ts->cur_plate) {
>> + case LRADC_TOUCH:
>> + if (mxs_lradc_check_touch_event(ts))
>> + mxs_lradc_start_touch_event(ts);
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> + 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(ts->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));
>> + writel(reg & clr_irq,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> + }
>> +
>> + 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 */
>> + writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
>> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
>> + LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2),
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> +
>> + /* Power-down touchscreen touch-detect circuitry. */
>> + writel(mxs_lradc_plate_mask(lradc),
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>> +
>> + writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
>> + ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
>> +
>> + for (i = 1; i < LRADC_MAX_DELAY_CHANS; i++)
>> + writel(0, ts->base + 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) {
>> + writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
>> +
>> + if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE)
>> + writel(LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
>> + ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET);
>> + }
>> +}
>> +
>> +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 = "mxs-lradc-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_drvdata(dev->parent);
>> + struct mxs_lradc_ts *ts;
>> + struct resource *iores;
>> + int ret, irq, virq, i;
>> + u32 ts_wires = 0, adapt;
>> +
>> + 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);
>> +
>> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + ts->base = devm_ioremap(dev, iores->start, resource_size(iores));
>> + if (IS_ERR(ts->base))
>> + return PTR_ERR(ts->base);
>> +
>> + ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
>> + &ts_wires);
>> + if (ret)
>> + return ret;
>> +
>> + 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;
>> + }
>> + }
>> +
>> + ret = stmp_reset_block(ts->base);
>> + if (ret)
>> + return ret;
>> +
>> + mxs_lradc_ts_hw_init(ts);
>> +
>> + for (i = 0; i < 3; i++) {
>> + irq = platform_get_irq_byname(pdev, mxs_lradc_ts_irq_names[i]);
>> + if (irq < 0)
>> + return irq;
>> +
>> + virq = irq_of_parse_and_map(node, irq);
>
> Why do we need this? I'd expect parent to fully prepare interrupts for
> the child to use. I.e. I'd expect I could do platform_get_irq_byname()
> and them go straight to devm_request_irq().
Well probe fails and devm_request_irq trows error -22 in that case,
so I think that use of irq_of_parse_and_map is needed.
>> +
>> + ret = devm_request_irq(dev, virq,
>> + mxs_lradc_ts_handle_irq,
>> + 0, mxs_lradc_ts_irq_names[i], ts);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + ret = mxs_lradc_ts_register(ts);
>> + if (!ret)
>> + goto error;
>> +
>> + return 0;
>> +
>> +error:
>> + mxs_lradc_ts_stop(ts);
>
> Why do you want to stop only if mxs_lradc_ts_register() fails? If open()
> has been called, then close() should be called on error automatically.
> That said, shouldn't you call mxs_lradc_ts_stop() before requesting
> interrupts, just to make sure they do not start firing early (even
> though I think it should be safe if they do)?
Ok, I will do that.
Thanks,
Ksenija
> Thanks.
>
>> +
>> + return ret;
>> +}
>> +
>> +static struct platform_driver mxs_lradc_ts_driver = {
>> + .driver = {
>> + .name = "mxs-lradc-ts",
>> + },
>> + .probe = mxs_lradc_ts_probe,
>> +};
>> +module_platform_driver(mxs_lradc_ts_driver);
>> +
>> +MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
>> +MODULE_DESCRIPTION("Freescale MXS LRADC touchscreen driver");
>> +MODULE_LICENSE("GPL");
>> +MODULE_ALIAS("platform:mxs-lradc-ts");
>> --
>> 1.9.1
>>
>
> --
> Dmitry
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH v11 4/5] iio: adc: mxs-lradc: Remove driver
2016-12-08 22:27 [PATCH v11 0/5] mxs-lradc: Split driver into MFD Ksenija Stanojevic
` (2 preceding siblings ...)
2016-12-08 22:27 ` [PATCH v11 3/5] input: touchscreen: mxs-lradc: Add support for touchscreen Ksenija Stanojevic
@ 2016-12-08 22:27 ` Ksenija Stanojevic
2016-12-08 22:27 ` [PATCH v11 5/5] mfd: Move binding document Ksenija Stanojevic
2016-12-08 23:02 ` [PATCH v11 0/5] mxs-lradc: Split driver into MFD Marek Vasut
5 siblings, 0 replies; 14+ messages in thread
From: Ksenija Stanojevic @ 2016-12-08 22:27 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>
Acked-by: Jonathan Cameron <jic23@kernel.org>
---
Changes in v11:
- none
Changes in v10:
- none
Changes in v9:
- none
Changes in v8:
- rebase onto 4.9-rc1
Changes in v7:
- none
Changes in v6:
- none
Changes in v5:
- none
Changes in v4:
- none
Changes in v3:
- none
Changes in v2:
- add to the patchset
drivers/iio/adc/Kconfig | 14 -
drivers/iio/adc/Makefile | 1 -
drivers/iio/adc/mxs-lradc.c | 1750 -------------------------------------------
3 files changed, 1765 deletions(-)
delete mode 100644 drivers/iio/adc/mxs-lradc.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index ad6046a..30cdacf 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -374,20 +374,6 @@ 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 4b2cf9b..b691f8a 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -36,7 +36,6 @@ obj-$(CONFIG_MCP3422) += mcp3422.o
obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.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 b84d37c..0000000
--- a/drivers/iio/adc/mxs-lradc.c
+++ /dev/null
@@ -1,1750 +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_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)
-{
- /* 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);
- }
-
- 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;
-
- if (!lradc->use_touchscreen)
- return 0;
-
- input = devm_input_allocate_device(dev);
- if (!input)
- return -ENOMEM;
-
- input->name = DRIVER_NAME;
- 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);
-
- lradc->ts_input = input;
- input_set_drvdata(input, lradc);
-
- return input_register_device(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 void 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);
-
- /* 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));
-
- /* Start internal temperature sensing. */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
-}
-
-static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
-{
- int i;
-
- mxs_lradc_reg_clear(lradc,
- lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
- 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;
- }
- }
-
- ret = stmp_reset_block(lradc->base);
- if (ret)
- goto err_dev;
-
- /* Configure the hardware. */
- mxs_lradc_hw_init(lradc);
-
- /* 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");
- return ret;
- }
-
- return 0;
-
-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_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] 14+ messages in thread* [PATCH v11 5/5] mfd: Move binding document
2016-12-08 22:27 [PATCH v11 0/5] mxs-lradc: Split driver into MFD Ksenija Stanojevic
` (3 preceding siblings ...)
2016-12-08 22:27 ` [PATCH v11 4/5] iio: adc: mxs-lradc: Remove driver Ksenija Stanojevic
@ 2016-12-08 22:27 ` Ksenija Stanojevic
2017-01-04 10:57 ` Lee Jones
2016-12-08 23:02 ` [PATCH v11 0/5] mxs-lradc: Split driver into MFD Marek Vasut
5 siblings, 1 reply; 14+ messages in thread
From: Ksenija Stanojevic @ 2016-12-08 22:27 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
The bindings, which are now used in MFD, need also to be
documented in the MFD binding document.
Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
Changes in v11:
- none
Changes in v10:
- none
Changes in v9:
- format patch using -M option
Changes in v8:
- rebase onto 4.9-rc1
Changes in v7:
- add to the patchset
Documentation/devicetree/bindings/{iio/adc => mfd}/mxs-lradc.txt | 0
1 file changed, 0 insertions(+), 0 deletions(-)
rename Documentation/devicetree/bindings/{iio/adc => mfd}/mxs-lradc.txt (100%)
diff --git a/Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/mfd/mxs-lradc.txt
similarity index 100%
rename from Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt
rename to Documentation/devicetree/bindings/mfd/mxs-lradc.txt
--
1.9.1
^ permalink raw reply [flat|nested] 14+ messages in thread* Re: [PATCH v11 5/5] mfd: Move binding document
2016-12-08 22:27 ` [PATCH v11 5/5] mfd: Move binding document Ksenija Stanojevic
@ 2017-01-04 10:57 ` Lee Jones
0 siblings, 0 replies; 14+ messages in thread
From: Lee Jones @ 2017-01-04 10:57 UTC (permalink / raw)
To: Ksenija Stanojevic
Cc: linux-kernel, dmitry.torokhov, linux-input, jic23, knaack.h,
lars, pmeerw, marex, linux-iio, harald, stefan.wahren,
fabio.estevam
On Thu, 08 Dec 2016, Ksenija Stanojevic wrote:
> The bindings, which are now used in MFD, need also to be
> documented in the MFD binding document.
>
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
For my own reference:
Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
> ---
> Changes in v11:
> - none
>
> Changes in v10:
> - none
>
> Changes in v9:
> - format patch using -M option
>
> Changes in v8:
> - rebase onto 4.9-rc1
>
> Changes in v7:
> - add to the patchset
>
> Documentation/devicetree/bindings/{iio/adc => mfd}/mxs-lradc.txt | 0
> 1 file changed, 0 insertions(+), 0 deletions(-)
> rename Documentation/devicetree/bindings/{iio/adc => mfd}/mxs-lradc.txt (100%)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/mfd/mxs-lradc.txt
> similarity index 100%
> rename from Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt
> rename to Documentation/devicetree/bindings/mfd/mxs-lradc.txt
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH v11 0/5] mxs-lradc: Split driver into MFD
2016-12-08 22:27 [PATCH v11 0/5] mxs-lradc: Split driver into MFD Ksenija Stanojevic
` (4 preceding siblings ...)
2016-12-08 22:27 ` [PATCH v11 5/5] mfd: Move binding document Ksenija Stanojevic
@ 2016-12-08 23:02 ` Marek Vasut
5 siblings, 0 replies; 14+ messages in thread
From: Marek Vasut @ 2016-12-08 23:02 UTC (permalink / raw)
To: Ksenija Stanojevic, linux-kernel
Cc: lee.jones, dmitry.torokhov, linux-input, jic23, knaack.h, lars,
pmeerw, linux-iio, harald, stefan.wahren, fabio.estevam
On 12/08/2016 11:27 PM, Ksenija Stanojevic wrote:
> Split existing driver mxs-lradc into MFD with touchscreen and
> IIO part.
>
> Tested on I.MX28
>
> Ksenija Stanojevic (5):
> 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
> mfd: Move binding document
>
> .../bindings/{iio/adc => mfd}/mxs-lradc.txt | 0
> drivers/iio/adc/Kconfig | 27 +-
> drivers/iio/adc/Makefile | 2 +-
> drivers/iio/adc/mxs-lradc-adc.c | 843 ++++++++++
> drivers/iio/adc/mxs-lradc.c | 1750 --------------------
> drivers/input/touchscreen/Kconfig | 10 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/mxs-lradc-ts.c | 739 +++++++++
> drivers/mfd/Kconfig | 17 +
> drivers/mfd/Makefile | 1 +
> drivers/mfd/mxs-lradc.c | 264 +++
> include/linux/mfd/mxs-lradc.h | 187 +++
> 12 files changed, 2076 insertions(+), 1765 deletions(-)
> rename Documentation/devicetree/bindings/{iio/adc => mfd}/mxs-lradc.txt (100%)
> 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
>
Except minor nit in 1/5, the whole series is:
Reviewed-by: Marek Vasut <marex@denx.de>
--
Best regards,
Marek Vasut
^ permalink raw reply [flat|nested] 14+ messages in thread