* [PATCHv4 1/4] Input: add common DT binding for touchscreens
2014-05-21 17:36 [PATCHv4 0/4] tsc2005 DT binding Sebastian Reichel
@ 2014-05-21 17:36 ` Sebastian Reichel
2014-05-21 17:36 ` [PATCHv4 2/4] Input: tsc2005: add DT support Sebastian Reichel
` (3 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: Sebastian Reichel @ 2014-05-21 17:36 UTC (permalink / raw)
To: Sebastian Reichel, Dmitry Torokhov, Dmitry Torokhov, linux-input,
Tony Lindgren, Rob Herring
Cc: Pawel Moll, Mark Rutland, Ian Campbell, Kumar Gala, devicetree,
linux-omap, linux-kernel, Sebastian Reichel
Add common DT binding documentation for touchscreen devices and
implement input_parse_touchscreen_of_params, which parses the common
properties and configures the input device accordingly.
The method currently does not interpret the axis inversion properties,
since there is no matching flag in the generic linux input device.
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
---
.../bindings/input/touchscreen/touchscreen.txt | 27 +++++++++++++
drivers/input/touchscreen/Kconfig | 4 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/of_touchscreen.c | 44 ++++++++++++++++++++++
include/linux/input/touchscreen.h | 22 +++++++++++
5 files changed, 98 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
create mode 100644 drivers/input/touchscreen/of_touchscreen.c
create mode 100644 include/linux/input/touchscreen.h
diff --git a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
new file mode 100644
index 0000000..d8e0616
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
@@ -0,0 +1,27 @@
+General Touchscreen Properties:
+
+Optional properties for Touchscreens:
+ - touchscreen-size-x : horizontal resolution of touchscreen
+ (in pixels)
+ - touchscreen-size-y : vertical resolution of touchscreen
+ (in pixels)
+ - touchscreen-max-pressure : maximum reported pressure (arbitrary range
+ dependent on the controller)
+ - touchscreen-fuzz-x : horizontal noise value of the absolute input
+ device (in pixels)
+ - touchscreen-fuzz-y : vertical noise value of the absolute input
+ device (in pixels)
+ - touchscreen-fuzz-pressure : pressure noise value of the absolute input
+ device (arbitrary range dependent on the
+ controller)
+ - touchscreen-inverted-x : X axis is inverted (boolean)
+ - touchscreen-inverted-y : Y axis is inverted (boolean)
+
+Deprecated properties for Touchscreens:
+ - x-size : deprecated name for touchscreen-size-x
+ - y-size : deprecated name for touchscreen-size-y
+ - moving-threshold : deprecated name for a combination of
+ touchscreen-fuzz-x and touchscreen-fuzz-y
+ - contact-threshold : deprecated name for touchscreen-fuzz-pressure
+ - x-invert : deprecated name for touchscreen-inverted-x
+ - y-invert : deprecated name for touchscreen-inverted-y
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 68edc9d..b2a31ca 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -11,6 +11,10 @@ menuconfig INPUT_TOUCHSCREEN
if INPUT_TOUCHSCREEN
+config OF_TOUCHSCREEN
+ def_tristate INPUT
+ depends on INPUT && OF
+
config TOUCHSCREEN_88PM860X
tristate "Marvell 88PM860x touchscreen"
depends on MFD_88PM860X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 4bc954b..efa08ae 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -6,6 +6,7 @@
wm97xx-ts-y := wm97xx-core.o
+obj-$(CONFIG_OF_TOUCHSCREEN) += of_touchscreen.o
obj-$(CONFIG_TOUCHSCREEN_88PM860X) += 88pm860x-ts.o
obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o
obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o
diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c
new file mode 100644
index 0000000..0431b28
--- /dev/null
+++ b/drivers/input/touchscreen/of_touchscreen.c
@@ -0,0 +1,44 @@
+/*
+ * Generic DT helper functions for touchscreen devices
+ *
+ * Copyright (c) 2014 Sebastian Reichel <sre@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/of.h>
+#include <linux/input.h>
+
+/**
+ * touchscreen_parse_of_params - parse common touchscreen DT properties
+ * @dev: device that should be parsed
+ *
+ * This function parses common DT properties for touchscreens and setups the
+ * input device accordingly. The function keeps previously setuped default
+ * values if no value is specified via DT.
+ */
+void touchscreen_parse_of_params(struct input_dev *dev)
+{
+ struct device_node *np = dev->dev.parent->of_node;
+ struct input_absinfo *absinfo;
+
+ input_alloc_absinfo(dev);
+ if (!dev->absinfo)
+ return;
+
+ absinfo = &dev->absinfo[ABS_X];
+ of_property_read_u32(np, "touchscreen-size-x", &absinfo->maximum);
+ of_property_read_u32(np, "touchscreen-fuzz-x", &absinfo->fuzz);
+
+ absinfo = &dev->absinfo[ABS_Y];
+ of_property_read_u32(np, "touchscreen-size-y", &absinfo->maximum);
+ of_property_read_u32(np, "touchscreen-fuzz-y", &absinfo->fuzz);
+
+ absinfo = &dev->absinfo[ABS_PRESSURE];
+ of_property_read_u32(np, "touchscreen-max-pressure", &absinfo->maximum);
+ of_property_read_u32(np, "touchscreen-fuzz-pressure", &absinfo->fuzz);
+}
+EXPORT_SYMBOL(touchscreen_parse_of_params);
diff --git a/include/linux/input/touchscreen.h b/include/linux/input/touchscreen.h
new file mode 100644
index 0000000..67df6f2
--- /dev/null
+++ b/include/linux/input/touchscreen.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2014 Sebastian Reichel <sre@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _TOUCHSCREEN_H
+#define _TOUCHSCREEN_H
+
+#include <linux/input.h>
+
+#if defined(CONFIG_OF)
+void touchscreen_parse_of_params(struct input_dev *dev);
+#else
+static inline void touchscreen_parse_of_params(struct input_dev *dev) {
+ return;
+}
+#endif
+
+#endif
--
2.0.0.rc2
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCHv4 2/4] Input: tsc2005: add DT support
2014-05-21 17:36 [PATCHv4 0/4] tsc2005 DT binding Sebastian Reichel
2014-05-21 17:36 ` [PATCHv4 1/4] Input: add common DT binding for touchscreens Sebastian Reichel
@ 2014-05-21 17:36 ` Sebastian Reichel
2014-05-21 17:36 ` [PATCHv4 3/4] Documentation: dt: Document TSC2005 DT binding Sebastian Reichel
` (2 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: Sebastian Reichel @ 2014-05-21 17:36 UTC (permalink / raw)
To: Sebastian Reichel, Dmitry Torokhov, Dmitry Torokhov, linux-input,
Tony Lindgren, Rob Herring
Cc: Pawel Moll, Mark Rutland, Ian Campbell, Kumar Gala, devicetree,
linux-omap, linux-kernel, Sebastian Reichel
This adds DT support to the tsc2005 touchscreen
driver. It also adds regulator support to the
driver if booted via DT.
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
---
drivers/input/touchscreen/tsc2005.c | 122 ++++++++++++++++++++++++++++++------
1 file changed, 102 insertions(+), 20 deletions(-)
diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
index 9daaddd..731f0fd 100644
--- a/drivers/input/touchscreen/tsc2005.c
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -25,11 +25,15 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
+#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pm.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/tsc2005.h>
+#include <linux/regulator/consumer.h>
/*
* The touchscreen interface operates as follows:
@@ -100,6 +104,11 @@
TSC2005_CFR2_AVG_7)
#define MAX_12BIT 0xfff
+#define TSC2005_DEF_X_FUZZ 4
+#define TSC2005_DEF_Y_FUZZ 8
+#define TSC2005_DEF_P_FUZZ 2
+#define TSC2005_DEF_RESISTOR 280
+
#define TSC2005_SPI_MAX_SPEED_HZ 10000000
#define TSC2005_PENUP_TIME_MS 40
@@ -143,6 +152,9 @@ struct tsc2005 {
bool pen_down;
+ struct regulator *vio;
+
+ int reset_gpio;
void (*set_reset)(bool enable);
};
@@ -337,6 +349,14 @@ static void tsc2005_stop_scan(struct tsc2005 *ts)
tsc2005_cmd(ts, TSC2005_CMD_STOP);
}
+static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
+{
+ if (ts->reset_gpio >= 0)
+ gpio_set_value(ts->reset_gpio, enable);
+ else if (ts->set_reset)
+ ts->set_reset(enable);
+}
+
/* must be called with ts->mutex held */
static void __tsc2005_disable(struct tsc2005 *ts)
{
@@ -355,7 +375,7 @@ static void __tsc2005_enable(struct tsc2005 *ts)
{
tsc2005_start_scan(ts);
- if (ts->esd_timeout && ts->set_reset) {
+ if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
ts->last_valid_interrupt = jiffies;
schedule_delayed_work(&ts->esd_work,
round_jiffies_relative(
@@ -414,9 +434,9 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
}
/* hardware reset */
- ts->set_reset(false);
+ tsc2005_set_reset(ts, false);
usleep_range(100, 500); /* only 10us required */
- ts->set_reset(true);
+ tsc2005_set_reset(ts, true);
if (!success)
goto out;
@@ -459,7 +479,7 @@ static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
umode_t mode = attr->mode;
if (attr == &dev_attr_selftest.attr) {
- if (!ts->set_reset)
+ if (!ts->set_reset && !ts->reset_gpio)
mode = 0;
}
@@ -509,9 +529,9 @@ static void tsc2005_esd_work(struct work_struct *work)
tsc2005_update_pen_state(ts, 0, 0, 0);
- ts->set_reset(false);
+ tsc2005_set_reset(ts, false);
usleep_range(100, 500); /* only 10us required */
- ts->set_reset(true);
+ tsc2005_set_reset(ts, true);
enable_irq(ts->spi->irq);
tsc2005_start_scan(ts);
@@ -572,29 +592,47 @@ static void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
static int tsc2005_probe(struct spi_device *spi)
{
const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
+ struct device_node *np = spi->dev.of_node;
+
struct tsc2005 *ts;
struct input_dev *input_dev;
- unsigned int max_x, max_y, max_p;
- unsigned int fudge_x, fudge_y, fudge_p;
+ unsigned int max_x = MAX_12BIT;
+ unsigned int max_y = MAX_12BIT;
+ unsigned int max_p = MAX_12BIT;
+ unsigned int fudge_x = TSC2005_DEF_X_FUZZ;
+ unsigned int fudge_y = TSC2005_DEF_Y_FUZZ;
+ unsigned int fudge_p = TSC2005_DEF_P_FUZZ;
+ unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR;
+ unsigned int esd_timeout;
int error;
- if (!pdata) {
+ if (!np && !pdata) {
dev_err(&spi->dev, "no platform data\n");
return -ENODEV;
}
- fudge_x = pdata->ts_x_fudge ? : 4;
- fudge_y = pdata->ts_y_fudge ? : 8;
- fudge_p = pdata->ts_pressure_fudge ? : 2;
- max_x = pdata->ts_x_max ? : MAX_12BIT;
- max_y = pdata->ts_y_max ? : MAX_12BIT;
- max_p = pdata->ts_pressure_max ? : MAX_12BIT;
-
if (spi->irq <= 0) {
dev_err(&spi->dev, "no irq\n");
return -ENODEV;
}
+ if (pdata) {
+ fudge_x = pdata->ts_x_fudge;
+ fudge_y = pdata->ts_y_fudge;
+ fudge_p = pdata->ts_pressure_fudge;
+ max_x = pdata->ts_x_max;
+ max_y = pdata->ts_y_max;
+ max_p = pdata->ts_pressure_max;
+ x_plate_ohm = pdata->ts_x_plate_ohm;
+ esd_timeout = pdata->esd_timeout_ms;
+ } else {
+ x_plate_ohm = TSC2005_DEF_RESISTOR;
+ of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
+ esd_timeout = 0;
+ of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
+ &esd_timeout);
+ }
+
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
if (!spi->max_speed_hz)
@@ -612,9 +650,37 @@ static int tsc2005_probe(struct spi_device *spi)
ts->spi = spi;
ts->idev = input_dev;
- ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
- ts->esd_timeout = pdata->esd_timeout_ms;
- ts->set_reset = pdata->set_reset;
+ ts->x_plate_ohm = x_plate_ohm;
+ ts->esd_timeout = esd_timeout;
+
+ if (np) {
+ ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
+ if (ts->reset_gpio == -EPROBE_DEFER)
+ return ts->reset_gpio;
+ if (ts->reset_gpio < 0) {
+ dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
+ ts->reset_gpio);
+ return ts->reset_gpio;
+ }
+
+ error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
+ "reset-gpios");
+ if (error) {
+ dev_err(&spi->dev, "error requesting reset gpio: %d\n",
+ error);
+ return error;
+ }
+
+ ts->vio = devm_regulator_get(&spi->dev, "vio");
+ if (IS_ERR(ts->vio)) {
+ error = PTR_ERR(ts->vio);
+ dev_err(&spi->dev, "vio regulator missing (%d)", error);
+ return error;
+ }
+ } else {
+ ts->reset_gpio = -1;
+ ts->set_reset = pdata->set_reset;
+ }
mutex_init(&ts->mutex);
@@ -639,6 +705,9 @@ static int tsc2005_probe(struct spi_device *spi)
input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
+ if (np)
+ touchscreen_parse_of_params(input_dev);
+
input_dev->open = tsc2005_open;
input_dev->close = tsc2005_close;
@@ -656,12 +725,19 @@ static int tsc2005_probe(struct spi_device *spi)
return error;
}
+ /* enable regulator for DT */
+ if (ts->vio) {
+ error = regulator_enable(ts->vio);
+ if (error)
+ return error;
+ }
+
spi_set_drvdata(spi, ts);
error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
if (error) {
dev_err(&spi->dev,
"Failed to create sysfs attributes, err: %d\n", error);
- return error;
+ goto disable_regulator;
}
error = input_register_device(ts->idev);
@@ -676,6 +752,9 @@ static int tsc2005_probe(struct spi_device *spi)
err_remove_sysfs:
sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
+disable_regulator:
+ if (ts->vio)
+ regulator_disable(ts->vio);
return error;
}
@@ -685,6 +764,9 @@ static int tsc2005_remove(struct spi_device *spi)
sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
+ if (ts->vio)
+ regulator_disable(ts->vio);
+
return 0;
}
--
2.0.0.rc2
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCHv4 3/4] Documentation: dt: Document TSC2005 DT binding
2014-05-21 17:36 [PATCHv4 0/4] tsc2005 DT binding Sebastian Reichel
2014-05-21 17:36 ` [PATCHv4 1/4] Input: add common DT binding for touchscreens Sebastian Reichel
2014-05-21 17:36 ` [PATCHv4 2/4] Input: tsc2005: add DT support Sebastian Reichel
@ 2014-05-21 17:36 ` Sebastian Reichel
2014-05-21 17:36 ` [PATCHv4 4/4] DTS: ARM: OMAP3-N900: Add tsc2005 support Sebastian Reichel
2014-05-29 13:33 ` [PATCHv4 0/4] tsc2005 DT binding Sebastian Reichel
4 siblings, 0 replies; 9+ messages in thread
From: Sebastian Reichel @ 2014-05-21 17:36 UTC (permalink / raw)
To: Sebastian Reichel, Dmitry Torokhov, Dmitry Torokhov, linux-input,
Tony Lindgren, Rob Herring
Cc: Pawel Moll, Mark Rutland, Ian Campbell, Kumar Gala, devicetree,
linux-omap, linux-kernel, Sebastian Reichel
Add devicetree binding documentation for TSC2005 touchscreen.
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
---
.../bindings/input/touchscreen/tsc2005.txt | 42 ++++++++++++++++++++++
1 file changed, 42 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
new file mode 100644
index 0000000..4b641c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
@@ -0,0 +1,42 @@
+* Texas Instruments tsc2005 touchscreen controller
+
+Required properties:
+ - compatible : "ti,tsc2005"
+ - reg : SPI device address
+ - spi-max-frequency : Maximal SPI speed
+ - interrupts : IRQ specifier
+ - reset-gpios : GPIO specifier
+ - vio-supply : Regulator specifier
+
+Optional properties:
+ - ti,x-plate-ohms : integer, resistance of the touchscreen's X plates
+ in ohm (defaults to 280)
+ - ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
+ the configured time (in milli seconds), the driver
+ will reset it. This is disabled by default.
+ - properties defined in touchscreen.txt
+
+Example:
+
+&mcspi1 {
+ tsc2005@0 {
+ compatible = "ti,tsc2005";
+ spi-max-frequency = <6000000>;
+ reg = <0>;
+
+ vio-supply = <&vio>;
+
+ reset-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>; /* 104 */
+ interrupts-extended = <&gpio4 4 IRQ_TYPE_EDGE_RISING>; /* 100 */
+
+ touchscreen-fuzz-x = <4>;
+ touchscreen-fuzz-y = <7>;
+ touchscreen-fuzz-pressure = <2>;
+ touchscreen-max-x = <4096>;
+ touchscreen-max-y = <4096>;
+ touchscreen-max-pressure = <2048>;
+
+ ti,x-plate-ohms = <280>;
+ ti,esd-recovery-timeout-ms = <8000>;
+ };
+}
--
2.0.0.rc2
^ permalink raw reply related [flat|nested] 9+ messages in thread