Commit b621e30b authored by Dmitry Torokhov's avatar Dmitry Torokhov
Browse files

Input: ad7879 - allow exporting AUX/VBAT/GPIO pin via device property 



Up until now only platforms using legacy platform data were able to switch
AUX/VBAT/GPIO pin in GPIO mode and use it as regular GPIO line. Let's
allow platforms using generic device properties to do the same.

Reviewed-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Tested-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 069b2e2c

Documentation/devicetree/bindings/input/touchscreen/ad7879.txt

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ Optional properties: 
- adi,conversion-interval:	: 0    : convert one time only

				  1-255: 515us + val * 35us (up to 9.440ms)

				  This property has to be a '/bits/ 8' value

- gpio-controller		: Switch AUX/VBAT/GPIO pin to GPIO mode



Example:

drivers/input/touchscreen/ad7879.c

+13 −2
Original line number Diff line number Diff line
@@ -454,17 +454,28 @@ static void ad7879_gpio_set_value(struct gpio_chip *chip, 
static int ad7879_gpio_add(struct ad7879 *ts,

			   const struct ad7879_platform_data *pdata)

{

	bool gpio_export;

	int gpio_base;

	int ret = 0;



	if (pdata) {

		gpio_export = pdata->gpio_export;

		gpio_base = pdata->gpio_base;

	} else {

		gpio_export = device_property_read_bool(ts->dev,

							"gpio-controller");

		gpio_base = -1;

	}



	mutex_init(&ts->mutex);



	if (pdata && pdata->gpio_export) {

	if (gpio_export) {

		ts->gc.direction_input = ad7879_gpio_direction_input;

		ts->gc.direction_output = ad7879_gpio_direction_output;

		ts->gc.get = ad7879_gpio_get_value;

		ts->gc.set = ad7879_gpio_set_value;

		ts->gc.can_sleep = 1;

		ts->gc.base = pdata->gpio_base;

		ts->gc.base = gpio_base;

		ts->gc.ngpio = 1;

		ts->gc.label = "AD7879-GPIO";

		ts->gc.owner = THIS_MODULE;

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