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authorBastian Hecht <hechtb@gmail.com>2013-04-15 20:31:00 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2013-04-15 21:00:44 +0400
commite6a90810559cc3755a5b1629d1fd0b914462f98c (patch)
tree1c72c3dca2b9807cc94593687c49423d8beaf077 /drivers/input
parent95b24d22135549ac8352d719a052002838bb9f80 (diff)
downloadlinux-e6a90810559cc3755a5b1629d1fd0b914462f98c.tar.xz
Input: st1232 - add reset pin handling
We add the possibility to hand over a GPIO number for the reset pin. This way we can remove existing board code that takes care of it and group this information properly in the platform data or in the device tree configuration. Signed-off-by: Bastian Hecht <hechtb+renesas@gmail.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/st1232.c47
1 files changed, 43 insertions, 4 deletions
diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
index 75d8eb5ee609..1740a2496371 100644
--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c
@@ -19,13 +19,16 @@
*/
#include <linux/delay.h>
+#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/of_gpio.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/platform_data/st1232_pdata.h>
#define ST1232_TS_NAME "st1232-ts"
@@ -48,6 +51,7 @@ struct st1232_ts_data {
struct input_dev *input_dev;
struct st1232_ts_finger finger[MAX_FINGERS];
struct dev_pm_qos_request low_latency_req;
+ int reset_gpio;
};
static int st1232_ts_read_data(struct st1232_ts_data *ts)
@@ -139,10 +143,17 @@ end:
return IRQ_HANDLED;
}
+static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
+{
+ if (gpio_is_valid(ts->reset_gpio))
+ gpio_direction_output(ts->reset_gpio, poweron);
+}
+
static int st1232_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct st1232_ts_data *ts;
+ struct st1232_pdata *pdata = client->dev.platform_data;
struct input_dev *input_dev;
int error;
@@ -167,6 +178,25 @@ static int st1232_ts_probe(struct i2c_client *client,
ts->client = client;
ts->input_dev = input_dev;
+ if (pdata)
+ ts->reset_gpio = pdata->reset_gpio;
+ else if (client->dev.of_node)
+ ts->reset_gpio = of_get_gpio(client->dev.of_node, 0);
+ else
+ ts->reset_gpio = -ENODEV;
+
+ if (gpio_is_valid(ts->reset_gpio)) {
+ error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL);
+ if (error) {
+ dev_err(&client->dev,
+ "Unable to request GPIO pin %d.\n",
+ ts->reset_gpio);
+ return error;
+ }
+ }
+
+ st1232_ts_power(ts, true);
+
input_dev->name = "st1232-touchscreen";
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = &client->dev;
@@ -203,7 +233,10 @@ static int st1232_ts_probe(struct i2c_client *client,
static int st1232_ts_remove(struct i2c_client *client)
{
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
+
device_init_wakeup(&client->dev, 0);
+ st1232_ts_power(ts, false);
return 0;
}
@@ -212,11 +245,14 @@ static int st1232_ts_remove(struct i2c_client *client)
static int st1232_ts_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
- if (device_may_wakeup(&client->dev))
+ if (device_may_wakeup(&client->dev)) {
enable_irq_wake(client->irq);
- else
+ } else {
disable_irq(client->irq);
+ st1232_ts_power(ts, false);
+ }
return 0;
}
@@ -224,11 +260,14 @@ static int st1232_ts_suspend(struct device *dev)
static int st1232_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
- if (device_may_wakeup(&client->dev))
+ if (device_may_wakeup(&client->dev)) {
disable_irq_wake(client->irq);
- else
+ } else {
+ st1232_ts_power(ts, true);
enable_irq(client->irq);
+ }
return 0;
}