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Commit f657b00d authored by Sebastian Reichel's avatar Sebastian Reichel Committed by Dmitry Torokhov
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Input: atmel_mxt_ts - add support for reset line 



Provide support for controlling reset pin. If this is not driven
correctly the device will be held in reset and will not respond.

Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 8cc8446b

Documentation/devicetree/bindings/input/atmel,maxtouch.txt

+2 −0
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ Optional properties for main touchpad device: 
    experiment to determine which bit corresponds to which input. Use

    KEY_RESERVED for unused padding values.



- reset-gpios: GPIO specifier for the touchscreen's reset pin (active low)



Example:



	touch@4b {

drivers/input/touchscreen/atmel_mxt_ts.c

+22 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/interrupt.h>

#include <linux/of.h>

#include <linux/slab.h>

#include <linux/gpio/consumer.h>

#include <asm/unaligned.h>

#include <media/v4l2-device.h>

#include <media/v4l2-ioctl.h>
@@ -300,6 +301,7 @@ struct mxt_data { 
	u8 multitouch;

	struct t7_config t7_cfg;

	struct mxt_dbg dbg;

	struct gpio_desc *reset_gpio;



	/* Cached parameters from object table */

	u16 T5_address;
@@ -3133,6 +3135,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) 
	init_completion(&data->reset_completion);

	init_completion(&data->crc_completion);



	data->reset_gpio = devm_gpiod_get_optional(&client->dev,

						   "reset", GPIOD_OUT_LOW);

	if (IS_ERR(data->reset_gpio)) {

		error = PTR_ERR(data->reset_gpio);

		dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);

		return error;

	}



	error = devm_request_threaded_irq(&client->dev, client->irq,

					  NULL, mxt_interrupt,

					  pdata->irqflags | IRQF_ONESHOT,
@@ -3142,6 +3152,18 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) 
		return error;

	}



	if (data->reset_gpio) {

		data->in_bootloader = true;

		msleep(MXT_RESET_TIME);

		reinit_completion(&data->bl_completion);

		gpiod_set_value(data->reset_gpio, 1);

		error = mxt_wait_for_completion(data, &data->bl_completion,

						MXT_RESET_TIMEOUT);

		if (error)

			return error;

		data->in_bootloader = false;

	}



	disable_irq(client->irq);



	error = mxt_initialize(data);