The touchscreen can have a reset GPIO connected to it, add support
for such an arrangement.
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Henrik Rydberg <rydberg@xxxxxxxxxxx>
Cc: Olivier Sobrie <olivier@xxxxxxxxx>
To: linux-input@xxxxxxxxxxxxxxx
---
drivers/input/touchscreen/ili210x.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
index 1102ee560bf4d..7579cf16b3663 100644
--- a/drivers/input/touchscreen/ili210x.c
+++ b/drivers/input/touchscreen/ili210x.c
@@ -5,6 +5,7 @@
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#define MAX_TOUCHES 2
#define DEFAULT_POLL_PERIOD 20
@@ -42,6 +43,7 @@ struct firmware_version {
struct ili210x {
struct i2c_client *client;
struct input_dev *input;
+ struct gpio_desc *reset_gpio;
};
static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
@@ -158,6 +160,7 @@ static int ili210x_i2c_probe(struct i2c_client *client,
{
struct device *dev = &client->dev;
struct ili210x *priv;
+ struct gpio_desc *reset_gpio;
struct input_dev *input;
struct panel_info panel;
struct firmware_version firmware;
@@ -171,6 +174,17 @@ static int ili210x_i2c_probe(struct i2c_client *client,
return -EINVAL;
}
+ reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+
+ if (reset_gpio) {
+ gpiod_set_value_cansleep(reset_gpio, 1);
+ usleep_range(50, 100);
+ gpiod_set_value_cansleep(reset_gpio, 0);
+ mdelay(100);
+ }
+
/* Get firmware version */
error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
&firmware, sizeof(firmware));
@@ -198,6 +212,7 @@ static int ili210x_i2c_probe(struct i2c_client *client,
priv->client = client;
priv->input = input;
+ priv->reset_gpio = reset_gpio;
/* Setup input device */
input->name = "ILI210x Touchscreen";
@@ -256,8 +271,12 @@ static int ili210x_i2c_probe(struct i2c_client *client,
static int ili210x_i2c_remove(struct i2c_client *client)
{
+ struct ili210x *priv = i2c_get_clientdata(client);
+
sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group);
input_unregister_device(priv->input);
+ if (priv->reset_gpio)
+ gpiod_set_value_cansleep(priv->reset_gpio, 1);
return 0;
}
--
2.18.0
