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Input: st1232 - add reset pin handling

Browse source 
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 <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
This commit is contained in:
Bastian Hecht 2013-04-15 09:31:00 -07:00 • committed by Dmitry Torokhov
commit e6a9081055
3 changed files with 80 additions and 4 deletions
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47
drivers/input/touchscreen/st1232.c
View file

@ -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;
}