* [PATCH v2 1/3] mfd: mc13xxx: Add mc34708 adc support
2019-07-11 22:23 [PATCH v2 0/3] mfd: mc13xxx: Fixes and enhancements for NXP's mc34708 Lukasz Majewski
@ 2019-07-11 22:23 ` Lukasz Majewski
2019-07-11 22:23 ` [PATCH v2 2/3] input: touchscreen mc13xxx: Make platform data optional Lukasz Majewski
2019-07-11 22:23 ` [PATCH v2 3/3] input: touchscreen mc13xxx: Add mc34708 support Lukasz Majewski
2 siblings, 0 replies; 10+ messages in thread
From: Lukasz Majewski @ 2019-07-11 22:23 UTC (permalink / raw)
To: Lee Jones
Cc: linux-kernel, Dmitry Torokhov, Sascha Hauer, Enrico Weigelt,
Thomas Gleixner, Kate Stewart, linux-input, Lukasz Majewski
From: Sascha Hauer <s.hauer@pengutronix.de>
The mc34708 has an improved adc. The older variants will always convert
a fixed order of channels. The mc34708 can do up to eight conversions
in arbitrary channel order. Currently this extended feature is not
supported. We only support touchscreen conversions now, which will
be sampled in a data format compatible to the older chips in order
to keep the API between the mfd and the touchscreen driver.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
Changes for v2:
- Change the return code patch when the mc13xxx ADC is performing conversion
- Introduce new include/linux/mfd/mc34708.h header file for mc34708 specific
defines
Changes from the original patches:
- ADC conversion functions prototypes added to fix build error
- Adjustments to make checkpatch clean (-ENOSYS, line over 80 char)
This patch applies on top of v5.2 - SHA1: 0ecfebd2b52404ae0c54a878c872bb93363ada36
---
drivers/mfd/mc13xxx-core.c | 102 +++++++++++++++++++++++++++++++++++++++++++-
drivers/mfd/mc13xxx.h | 3 ++
include/linux/mfd/mc34708.h | 37 ++++++++++++++++
3 files changed, 141 insertions(+), 1 deletion(-)
create mode 100644 include/linux/mfd/mc34708.h
diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
index 1abe7432aad8..01473d6fda21 100644
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -12,6 +12,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
+#include <linux/mfd/mc34708.h>
#include "mc13xxx.h"
@@ -45,6 +46,8 @@
#define MC13XXX_ADC2 45
+#define MC13XXX_ADC_WORKING (1 << 0)
+
void mc13xxx_lock(struct mc13xxx *mc13xxx)
{
if (!mutex_trylock(&mc13xxx->lock)) {
@@ -198,22 +201,30 @@ static void mc34708_print_revision(struct mc13xxx *mc13xxx, u32 revision)
maskval(revision, MC34708_REVISION_FAB));
}
+static int mc13xxx_adc_conversion(struct mc13xxx *, unsigned int,
+ unsigned int, u8, bool, unsigned int *);
+static int mc34708_adc_conversion(struct mc13xxx *, unsigned int,
+ unsigned int, u8, bool, unsigned int *);
+
/* These are only exported for mc13xxx-i2c and mc13xxx-spi */
struct mc13xxx_variant mc13xxx_variant_mc13783 = {
.name = "mc13783",
.print_revision = mc13xxx_print_revision,
+ .adc_do_conversion = mc13xxx_adc_conversion,
};
EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783);
struct mc13xxx_variant mc13xxx_variant_mc13892 = {
.name = "mc13892",
.print_revision = mc13xxx_print_revision,
+ .adc_do_conversion = mc13xxx_adc_conversion,
};
EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892);
struct mc13xxx_variant mc13xxx_variant_mc34708 = {
.name = "mc34708",
.print_revision = mc34708_print_revision,
+ .adc_do_conversion = mc34708_adc_conversion,
};
EXPORT_SYMBOL_GPL(mc13xxx_variant_mc34708);
@@ -249,7 +260,7 @@ static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
#define MC13XXX_ADC_WORKING (1 << 0)
-int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
+static int mc13xxx_adc_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
unsigned int channel, u8 ato, bool atox,
unsigned int *sample)
{
@@ -358,6 +369,95 @@ int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
return ret;
}
+
+static int mc34708_adc_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
+ unsigned int channel, u8 ato, bool atox,
+ unsigned int *sample)
+{
+ int ret, i;
+ u32 adc0, adc3, adc1, old_adc0;
+ struct mc13xxx_adcdone_data adcdone_data = {
+ .mc13xxx = mc13xxx,
+ };
+
+ switch (mode) {
+ case MC13XXX_ADC_MODE_TS:
+ adc0 = MC34708_ADC0_TSEN | MC34708_ADC0_TSSTART |
+ MC34708_ADC0_TSSTOP(7);
+
+ adc1 = MC34708_ADC1_TSDLY1(0xf) |
+ MC34708_ADC1_TSDLY2(0xf) |
+ MC34708_ADC1_TSDLY3(0xf);
+
+ adc3 = MC34708_ADC3_TSSEL(0, MC34708_TS_X) |
+ MC34708_ADC3_TSSEL(1, MC34708_TS_Y) |
+ MC34708_ADC3_TSSEL(2, MC34708_TS_X) |
+ MC34708_ADC3_TSSEL(3, MC34708_TS_Y) |
+ MC34708_ADC3_TSSEL(4, MC34708_TS_X) |
+ MC34708_ADC3_TSSEL(5, MC34708_TS_R) |
+ MC34708_ADC3_TSSEL(6, MC34708_TS_Y) |
+ MC34708_ADC3_TSSEL(7, MC34708_TS_R);
+ break;
+
+ case MC13XXX_ADC_MODE_SINGLE_CHAN:
+ case MC13XXX_ADC_MODE_MULT_CHAN:
+ default:
+ return -EINVAL;
+ }
+
+ init_completion(&adcdone_data.done);
+
+ mc13xxx_lock(mc13xxx);
+
+ if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
+ mc13xxx_unlock(mc13xxx);
+ return -EBUSY;
+ }
+
+ mc13xxx->adcflags |= MC13XXX_ADC_WORKING;
+
+ mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
+
+ mc13xxx_irq_request(mc13xxx, MC34708_IRQ_TSDONE,
+ mc13xxx_handler_adcdone, __func__, &adcdone_data);
+ mc13xxx_irq_ack(mc13xxx, MC34708_IRQ_TSDONE);
+
+ mc13xxx_reg_write(mc13xxx, MC34708_ADC3, adc3);
+ mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1);
+ mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0);
+
+ mc13xxx_unlock(mc13xxx);
+
+ ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ);
+
+ mc13xxx_lock(mc13xxx);
+
+ mc13xxx_irq_free(mc13xxx, MC34708_IRQ_TSDONE, &adcdone_data);
+
+ if (!ret) {
+ ret = -ETIMEDOUT;
+ goto out;
+ }
+
+ for (i = 0; i < 4; i++)
+ mc13xxx_reg_read(mc13xxx, MC34708_ADC4 + i, &sample[i]);
+
+out:
+ ret = mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);
+
+ mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
+ mc13xxx_unlock(mc13xxx);
+
+ return ret;
+}
+
+int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
+ unsigned int channel, u8 ato, bool atox,
+ unsigned int *sample)
+{
+ return mc13xxx->variant->adc_do_conversion(mc13xxx, mode, channel, ato,
+ atox, sample);
+}
EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion);
static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
diff --git a/drivers/mfd/mc13xxx.h b/drivers/mfd/mc13xxx.h
index ce6eec52e8eb..0a79fbb8bcb4 100644
--- a/drivers/mfd/mc13xxx.h
+++ b/drivers/mfd/mc13xxx.h
@@ -19,6 +19,9 @@ struct mc13xxx;
struct mc13xxx_variant {
const char *name;
void (*print_revision)(struct mc13xxx *mc13xxx, u32 revision);
+ int (*adc_do_conversion)(struct mc13xxx *mc13xxx, unsigned int mode,
+ unsigned int channel, u8 ato, bool atox,
+ unsigned int *sample);
};
extern struct mc13xxx_variant
diff --git a/include/linux/mfd/mc34708.h b/include/linux/mfd/mc34708.h
new file mode 100644
index 000000000000..c812104dc53d
--- /dev/null
+++ b/include/linux/mfd/mc34708.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2019
+ * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
+ */
+#ifndef __LINUX_MFD_MC34708_H
+#define __LINUX_MFD_MC34708_H
+
+#define MC34708_ADC3 46
+#define MC34708_ADC4 47
+
+#define MC34708_IRQ_TSDONE 1
+
+#define MC34708_ADC0_TSEN BIT(12)
+#define MC34708_ADC0_TSSTART BIT(13)
+#define MC34708_ADC0_TSCONT BIT(14)
+#define MC34708_ADC0_TSHOLD BIT(15)
+#define MC34708_ADC0_TSPENDETEN BIT(20)
+
+#define MC34708_ADC0_TSMASK (MC34708_ADC0_TSPENDETEN | \
+ MC34708_ADC0_TSEN | \
+ MC34708_ADC0_TSSTART | \
+ MC34708_ADC0_TSCONT | \
+ MC34708_ADC0_TSHOLD)
+
+#define MC34708_ADC0_TSSTOP(x) (((x) & 0x7) << 16)
+
+#define MC34708_ADC3_TSSEL(step, ch) ((ch) << (8 + 2 * (step)))
+#define MC34708_ADC1_TSDLY1(d) ((d) << 12)
+#define MC34708_ADC1_TSDLY2(d) ((d) << 16)
+#define MC34708_ADC1_TSDLY3(d) ((d) << 20)
+
+#define MC34708_TS_X 1
+#define MC34708_TS_Y 2
+#define MC34708_TS_R 3
+
+#endif /* __LINUX_MFD_MC34708_H */
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 2/3] input: touchscreen mc13xxx: Make platform data optional
2019-07-11 22:23 [PATCH v2 0/3] mfd: mc13xxx: Fixes and enhancements for NXP's mc34708 Lukasz Majewski
2019-07-11 22:23 ` [PATCH v2 1/3] mfd: mc13xxx: Add mc34708 adc support Lukasz Majewski
@ 2019-07-11 22:23 ` Lukasz Majewski
2019-07-15 7:10 ` Dmitry Torokhov
2019-07-11 22:23 ` [PATCH v2 3/3] input: touchscreen mc13xxx: Add mc34708 support Lukasz Majewski
2 siblings, 1 reply; 10+ messages in thread
From: Lukasz Majewski @ 2019-07-11 22:23 UTC (permalink / raw)
To: Lee Jones
Cc: linux-kernel, Dmitry Torokhov, Sascha Hauer, Enrico Weigelt,
Thomas Gleixner, Kate Stewart, linux-input, Lukasz Majewski
From: Sascha Hauer <s.hauer@pengutronix.de>
The platform data once was optional, make it optional again. This
is a first step towards device tree support for the mc13xxx touchscreen
driver.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
Changes for v2:
- None
Changes from the original patch:
- Commit message typo fixes
---
drivers/input/touchscreen/mc13783_ts.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c
index ae0d978c83bf..edd49e44e0c9 100644
--- a/drivers/input/touchscreen/mc13783_ts.c
+++ b/drivers/input/touchscreen/mc13783_ts.c
@@ -35,7 +35,8 @@ struct mc13783_ts_priv {
struct mc13xxx *mc13xxx;
struct delayed_work work;
unsigned int sample[4];
- struct mc13xxx_ts_platform_data *touch;
+ u8 ato;
+ bool atox;
};
static irqreturn_t mc13783_ts_handler(int irq, void *data)
@@ -125,7 +126,7 @@ static void mc13783_ts_work(struct work_struct *work)
if (mc13xxx_adc_do_conversion(priv->mc13xxx,
mode, channel,
- priv->touch->ato, priv->touch->atox,
+ priv->ato, priv->atox,
priv->sample) == 0)
mc13783_ts_report_sample(priv);
}
@@ -169,6 +170,7 @@ static void mc13783_ts_close(struct input_dev *dev)
static int __init mc13783_ts_probe(struct platform_device *pdev)
{
struct mc13783_ts_priv *priv;
+ struct mc13xxx_ts_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct input_dev *idev;
int ret = -ENOMEM;
@@ -180,11 +182,10 @@ static int __init mc13783_ts_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
priv->idev = idev;
- priv->touch = dev_get_platdata(&pdev->dev);
- if (!priv->touch) {
- dev_err(&pdev->dev, "missing platform data\n");
- ret = -ENODEV;
- goto err_free_mem;
+
+ if (pdata) {
+ priv->atox = pdata->atox;
+ priv->ato = pdata->ato;
}
idev->name = MC13783_TS_NAME;
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 3/3] input: touchscreen mc13xxx: Add mc34708 support
2019-07-11 22:23 [PATCH v2 0/3] mfd: mc13xxx: Fixes and enhancements for NXP's mc34708 Lukasz Majewski
2019-07-11 22:23 ` [PATCH v2 1/3] mfd: mc13xxx: Add mc34708 adc support Lukasz Majewski
2019-07-11 22:23 ` [PATCH v2 2/3] input: touchscreen mc13xxx: Make platform data optional Lukasz Majewski
@ 2019-07-11 22:23 ` Lukasz Majewski
2019-07-15 7:07 ` Dmitry Torokhov
2 siblings, 1 reply; 10+ messages in thread
From: Lukasz Majewski @ 2019-07-11 22:23 UTC (permalink / raw)
To: Lee Jones
Cc: linux-kernel, Dmitry Torokhov, Sascha Hauer, Enrico Weigelt,
Thomas Gleixner, Kate Stewart, linux-input, Lukasz Majewski
From: Sascha Hauer <s.hauer@pengutronix.de>
The mc34708 has a different bit to enable pen detection. This
adds the driver data and devtype necessary to probe the device
and to distinguish between the mc13783 and the mc34708.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
Changes for v2:
- Change nested if statements to a single one (with cr0 > ...)
- Replace hardcoded max resistance value (4080) with a generic driver data
value.
- Introduce new include/linux/mfd/mc34708.h header file for mc34708 specific
defines
- Define as driver data mask and value for accessing mc13xxx registers
Changes from the original patch:
- Simplify the mcXXXXX_set_pen_detection functions
- Fix checkpatch warnings
---
drivers/input/touchscreen/mc13783_ts.c | 59 +++++++++++++++++++++++++++++++---
1 file changed, 55 insertions(+), 4 deletions(-)
diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c
index edd49e44e0c9..8fd3d0e47f57 100644
--- a/drivers/input/touchscreen/mc13783_ts.c
+++ b/drivers/input/touchscreen/mc13783_ts.c
@@ -10,6 +10,7 @@
*/
#include <linux/platform_device.h>
#include <linux/mfd/mc13783.h>
+#include <linux/mfd/mc34708.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
@@ -30,6 +31,8 @@ MODULE_PARM_DESC(sample_tolerance,
"is supposed to be wrong and is discarded. Set to 0 to "
"disable this check.");
+struct mc13xxx_driver_data;
+
struct mc13783_ts_priv {
struct input_dev *idev;
struct mc13xxx *mc13xxx;
@@ -37,6 +40,33 @@ struct mc13783_ts_priv {
unsigned int sample[4];
u8 ato;
bool atox;
+ struct mc13xxx_driver_data *drvdata;
+};
+
+enum mc13xxx_type {
+ MC13XXX_TYPE_MC13783,
+ MC13XXX_TYPE_MC34708,
+};
+
+struct mc13xxx_driver_data {
+ enum mc13xxx_type type;
+ int max_resistance;
+ u32 reg_mask;
+ u32 reg_value;
+};
+
+static struct mc13xxx_driver_data mc13783_driver_data = {
+ .type = MC13XXX_TYPE_MC13783,
+ .max_resistance = 4096,
+ .reg_mask = MC13XXX_ADC0_TSMOD_MASK,
+ .reg_value = MC13XXX_ADC0_TSMOD0,
+};
+
+static struct mc13xxx_driver_data mc34708_driver_data = {
+ .type = MC13XXX_TYPE_MC34708,
+ .max_resistance = 4080,
+ .reg_mask = MC34708_ADC0_TSMASK,
+ .reg_value = MC34708_ADC0_TSPENDETEN,
};
static irqreturn_t mc13783_ts_handler(int irq, void *data)
@@ -93,6 +123,10 @@ static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
cr0 = (cr0 + cr1) / 2;
+ if (priv->drvdata->type == MC13XXX_TYPE_MC34708 &&
+ cr0 > priv->drvdata->max_resistance)
+ cr0 = 0;
+
if (!cr0 || !sample_tolerance ||
(x2 - x0 < sample_tolerance &&
y2 - y0 < sample_tolerance)) {
@@ -102,14 +136,14 @@ static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
input_report_abs(idev, ABS_Y, y1);
dev_dbg(&idev->dev, "report (%d, %d, %d)\n",
- x1, y1, 0x1000 - cr0);
+ x1, y1, priv->drvdata->max_resistance - cr0);
schedule_delayed_work(&priv->work, HZ / 50);
} else {
dev_dbg(&idev->dev, "report release\n");
}
input_report_abs(idev, ABS_PRESSURE,
- cr0 ? 0x1000 - cr0 : cr0);
+ cr0 ? priv->drvdata->max_resistance - cr0 : 0);
input_report_key(idev, BTN_TOUCH, cr0);
input_sync(idev);
} else {
@@ -146,7 +180,8 @@ static int mc13783_ts_open(struct input_dev *dev)
goto out;
ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
- MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0);
+ priv->drvdata->reg_mask,
+ priv->drvdata->reg_value);
if (ret)
mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
out:
@@ -160,7 +195,7 @@ static void mc13783_ts_close(struct input_dev *dev)
mc13xxx_lock(priv->mc13xxx);
mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
- MC13XXX_ADC0_TSMOD_MASK, 0);
+ priv->drvdata->reg_mask, 0);
mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
mc13xxx_unlock(priv->mc13xxx);
@@ -172,6 +207,7 @@ static int __init mc13783_ts_probe(struct platform_device *pdev)
struct mc13783_ts_priv *priv;
struct mc13xxx_ts_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct input_dev *idev;
+ const struct platform_device_id *id = platform_get_device_id(pdev);
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -182,6 +218,7 @@ static int __init mc13783_ts_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
priv->idev = idev;
+ priv->drvdata = (void *)id->driver_data;
if (pdata) {
priv->atox = pdata->atox;
@@ -228,7 +265,21 @@ static int mc13783_ts_remove(struct platform_device *pdev)
return 0;
}
+static const struct platform_device_id mc13xxx_ts_idtable[] = {
+ {
+ .name = "mc13783-ts",
+ .driver_data = (kernel_ulong_t)&mc13783_driver_data,
+ }, {
+ .name = "mc34708-ts",
+ .driver_data = (kernel_ulong_t)&mc34708_driver_data,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(platform, mc13xxx_ts_idtable);
+
static struct platform_driver mc13783_ts_driver = {
+ .id_table = mc13xxx_ts_idtable,
.remove = mc13783_ts_remove,
.driver = {
.name = MC13783_TS_NAME,
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread