[PATCH 4/7] touchscreen: pixcir_i2c: Add support for wake and enable gpios

Dmitry Torokhov
2015-11-20T17:27:25Z

On Fri, Nov 20, 2015 at 12:17:10PM +0100, Hans de Goede wrote:
> From: Sander Vermin <sander@vermin.nl>
>
> On some devices the wake and enable pins of the pixcir touchscreen
> controller are connected to gpios and these must be controlled by the
> driver for the device to operate properly.
>
> Signed-off-by: Sander Vermin <sander@vermin.nl>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> Changes in v2 (Hans de Goede):
> -Split the changes for dealing with inverted / swapped axis out into a
> separate patch
> -Remove a bunch of dev_info calls to make the driver less chatty
> -Use devm_gpiod_get_optional as these new gpios are optional
> -Only msleep after setting enable high if we have an enable pin
> ---
> .../bindings/input/touchscreen/pixcir_i2c_ts.txt | 2 +
> drivers/input/touchscreen/pixcir_i2c_ts.c | 46 ++++++++++++++++++++++
> 2 files changed, 48 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> index 8eb240a..72ca5ec 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> @@ -10,6 +10,8 @@ Required properties:
>
> Optional properties:
> - reset-gpio: GPIO connected to the RESET line of the chip
> +- enable-gpios: GPIO connected to the ENABLE line of the chip
> +- wake-gpios: GPIO connected to the WAKE line of the chip
>
> Example:
>
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 211408c..b75ef65 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -38,6 +38,8 @@ struct pixcir_i2c_ts_data {
> struct input_dev *input;
> struct gpio_desc *gpio_attb;
> struct gpio_desc *gpio_reset;
> + struct gpio_desc *gpio_enable;
> + struct gpio_desc *gpio_wake;
> const struct pixcir_i2c_chip_data *chip;
> int max_fingers; /* Max fingers supported in this instance */
> bool running;
> @@ -208,6 +210,11 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
> struct device *dev = &ts->client->dev;
> int ret;
>
> + if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
> + if (!IS_ERR_OR_NULL(ts->gpio_wake))
> + gpiod_set_value_cansleep(ts->gpio_wake, 1);

I believe you error out in case when IS_ERR(ts->gpio_wake) is true, so I
wonder if we should simply use

if (ts->gpio_wake)
gpiod_set_value_cansleep(ts->gpio_wake, 1);

here and elsewhere.

No need to resubmit, just let me know.

Thanks.

--
Dmitry