Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6f6deb48 authored by Hans de Goede's avatar Hans de Goede Committed by Dmitry Torokhov
Browse files

Input: silead - add regulator support 



On some tablets the touchscreen controller is powered by separate
regulators, add support for this.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent baf28d91

Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ Optional properties: 
- touchscreen-inverted-y  : See touchscreen.txt

- touchscreen-swapped-x-y : See touchscreen.txt

- silead,max-fingers	  : maximum number of fingers the touchscreen can detect

- vddio-supply		  : regulator phandle for controller VDDIO

- avdd-supply		  : regulator phandle for controller AVDD



Example:

drivers/input/touchscreen/silead.c

+29 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/input/touchscreen.h>

#include <linux/pm.h>

#include <linux/irq.h>

#include <linux/regulator/consumer.h>



#include <asm/unaligned.h>
@@ -73,6 +74,7 @@ struct silead_ts_data { 
	struct i2c_client *client;

	struct gpio_desc *gpio_power;

	struct input_dev *input;

	struct regulator_bulk_data regulators[2];

	char fw_name[64];

	struct touchscreen_properties prop;

	u32 max_fingers;
@@ -433,6 +435,13 @@ static int silead_ts_set_default_fw_name(struct silead_ts_data *data, 
}

#endif



static void silead_disable_regulator(void *arg)

{

	struct silead_ts_data *data = arg;



	regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);

}



static int silead_ts_probe(struct i2c_client *client,

			   const struct i2c_device_id *id)

{
@@ -465,6 +474,26 @@ static int silead_ts_probe(struct i2c_client *client, 
	if (client->irq <= 0)

		return -ENODEV;



	data->regulators[0].supply = "vddio";

	data->regulators[1].supply = "avdd";

	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),

					data->regulators);

	if (error)

		return error;



	/*

	 * Enable regulators at probe and disable them at remove, we need

	 * to keep the chip powered otherwise it forgets its firmware.

	 */

	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),

				      data->regulators);

	if (error)

		return error;



	error = devm_add_action_or_reset(dev, silead_disable_regulator, data);

	if (error)

		return error;



	/* Power GPIO pin */

	data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);

	if (IS_ERR(data->gpio_power)) {