Commit 27aced19 authored by Sebastian Reichel's avatar Sebastian Reichel Committed by Dmitry Torokhov
Browse files

Input: exc3000 - add reset gpio support 



Add basic support for an optional reset gpio.

Reviewed-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200805160520.456570-4-sebastian.reichel@collabora.com


Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 3bdd21c6

Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml

+2 −0
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ properties: 
    const: 0x2a

  interrupts:

    maxItems: 1

  reset-gpios:

    maxItems: 1

  touchscreen-size-x: true

  touchscreen-size-y: true

  touchscreen-inverted-x: true

drivers/input/touchscreen/exc3000.c

+17 −0
Original line number Diff line number Diff line
@@ -8,7 +8,9 @@ 
 */



#include <linux/bitops.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/input.h>

#include <linux/input/mt.h>
@@ -30,6 +32,9 @@ 


#define EXC3000_TIMEOUT_MS		100



#define EXC3000_RESET_MS		10

#define EXC3000_READY_MS		100



static const struct i2c_device_id exc3000_id[];



struct eeti_dev_info {
@@ -63,6 +68,7 @@ struct exc3000_data { 
	const struct eeti_dev_info *info;

	struct input_dev *input;

	struct touchscreen_properties prop;

	struct gpio_desc *reset;

	struct timer_list timer;

	u8 buf[2 * EXC3000_LEN_FRAME];

};
@@ -204,6 +210,17 @@ static int exc3000_probe(struct i2c_client *client) 
	}

	timer_setup(&data->timer, exc3000_timer, 0);



	data->reset = devm_gpiod_get_optional(&client->dev, "reset",

					      GPIOD_OUT_HIGH);

	if (IS_ERR(data->reset))

		return PTR_ERR(data->reset);



	if (data->reset) {

		msleep(EXC3000_RESET_MS);

		gpiod_set_value_cansleep(data->reset, 0);

		msleep(EXC3000_READY_MS);

	}



	input = devm_input_allocate_device(&client->dev);

	if (!input)

		return -ENOMEM;