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Commit 40929167 authored by Roger Quadros's avatar Roger Quadros Committed by Dmitry Torokhov
Browse files

Input: pixcir_i2c_ts - add RESET gpio 



The controller has a RESET pin which is usually controlled over
a GPIO line. If such a GPIO is provided, perform a RESET
during probe.

Signed-off-by: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 127520ca

Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt

+3 −0
Original line number Diff line number Diff line
@@ -8,6 +8,9 @@ Required properties: 
- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)

- touchscreen-size-y: vertical resolution of touchscreen (in pixels)



Optional properties:

- reset-gpio: GPIO connected to the RESET line of the chip



Example:



	i2c@00000000 {

drivers/input/touchscreen/pixcir_i2c_ts.c

+22 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ struct pixcir_i2c_ts_data { 
	struct i2c_client *client;

	struct input_dev *input;

	struct gpio_desc *gpio_attb;

	struct gpio_desc *gpio_reset;

	const struct pixcir_ts_platform_data *pdata;

	bool running;

	int max_fingers;	/* Max fingers supported in this instance */
@@ -189,6 +190,17 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id) 
	return IRQ_HANDLED;

}



static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)

{

	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {

		gpiod_set_value_cansleep(tsdata->gpio_reset, 1);

		ndelay(100);	/* datasheet section 1.2.3 says 80ns min. */

		gpiod_set_value_cansleep(tsdata->gpio_reset, 0);

		/* wait for controller ready. 100ms guess. */

		msleep(100);

	}

}



static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,

				 enum pixcir_power_mode mode)

{
@@ -529,6 +541,14 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, 
		return error;

	}



	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",

						     GPIOD_OUT_LOW);

	if (IS_ERR(tsdata->gpio_reset)) {

		error = PTR_ERR(tsdata->gpio_reset);

		dev_err(dev, "Failed to request RESET gpio: %d\n", error);

		return error;

	}



	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,

					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,

					  client->name, tsdata);
@@ -537,6 +557,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, 
		return error;

	}



	pixcir_reset(tsdata);



	/* Always be in IDLE mode to save power, device supports auto wake */

	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);

	if (error) {