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Commit 201f3c80 authored by Marek Vasut's avatar Marek Vasut Committed by Dmitry Torokhov
Browse files

Input: ili210x - add reset GPIO support 



The touchscreen can have a reset GPIO connected to it, add support
for such an arrangement.

Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 63083fd5

drivers/input/touchscreen/ili210x.c

+26 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#include <linux/input/mt.h>

#include <linux/delay.h>

#include <linux/workqueue.h>

#include <linux/gpio/consumer.h>



#define MAX_TOUCHES		2

#define DEFAULT_POLL_PERIOD	20
@@ -45,6 +46,7 @@ struct ili210x { 
	struct input_dev *input;

	unsigned int poll_period;

	struct delayed_work dwork;

	struct gpio_desc *reset_gpio;

};



static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
@@ -168,11 +170,19 @@ static const struct attribute_group ili210x_attr_group = { 
	.attrs = ili210x_attributes,

};



static void ili210x_power_down(void *data)

{

	struct gpio_desc *reset_gpio = data;



	gpiod_set_value_cansleep(reset_gpio, 1);

}



static int ili210x_i2c_probe(struct i2c_client *client,

				       const struct i2c_device_id *id)

{

	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;
@@ -186,6 +196,21 @@ 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) {

		error = devm_add_action_or_reset(dev, ili210x_power_down,

						 reset_gpio);

		if (error)

			return error;



		usleep_range(50, 100);

		gpiod_set_value_cansleep(reset_gpio, 0);

		msleep(100);

	}



	/* Get firmware version */

	error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,

				 &firmware, sizeof(firmware));
@@ -218,6 +243,7 @@ static int ili210x_i2c_probe(struct i2c_client *client, 
	priv->input = input;

	priv->poll_period = DEFAULT_POLL_PERIOD;

	INIT_DELAYED_WORK(&priv->dwork, ili210x_work);

	priv->reset_gpio = reset_gpio;



	/* Setup input device */

	input->name = "ILI210x Touchscreen";