Re: [PATCH v3] touchscreen: pixcir_i2c: Add support for wake and enable gpios

Rob Herring
2015-11-22T22:19:50Z

On Sun, Nov 22, 2015 at 04:57:33PM +0100, Hans de Goede wrote:
> From: Sander Vermin <sander-wENMetUwf8VmR6Xm/wNWPw@public.gmane.org>
>
> 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-wENMetUwf8VmR6Xm/wNWPw@public.gmane.org>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
> 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
> Changes in v3 (Hans de Goede):
> -Use "if (ts->gpio_foo)" instead of "if (!IS_ERR_OR_NULL(ts->foo))"
> -No need to set gpio-s to 1 after requesting them with GPIOD_OUT_HIGH
> ---
> .../bindings/input/touchscreen/pixcir_i2c_ts.txt | 2 ++

For the binding:

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

> drivers/input/touchscreen/pixcir_i2c_ts.c | 40 ++++++++++++++++++++++
> 2 files changed, 42 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..22a67c6 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 (ts->gpio_wake)
> + gpiod_set_value_cansleep(ts->gpio_wake, 1);
> + }
> +
> ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
> if (ret < 0) {
> dev_err(dev, "%s: can't read reg 0x%x : %d\n",
> @@ -228,6 +235,11 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
> return ret;
> }
>
> + if (mode == PIXCIR_POWER_HALT) {
> + if (ts->gpio_wake)
> + gpiod_set_value_cansleep(ts->gpio_wake, 0);
> + }
> +
> return 0;
> }
>
> @@ -302,6 +314,11 @@ static int pixcir_start(struct pixcir_i2c_ts_data *ts)
> struct device *dev = &ts->client->dev;
> int error;
>
> + if (ts->gpio_enable) {
> + gpiod_set_value_cansleep(ts->gpio_enable, 1);
> + msleep(100);
> + }
> +
> /* LEVEL_TOUCH interrupt with active low polarity */
> error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
> if (error) {
> @@ -343,6 +360,9 @@ static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
> /* Wait till running ISR is complete */
> synchronize_irq(ts->client->irq);
>
> + if (ts->gpio_enable)
> + gpiod_set_value_cansleep(ts->gpio_enable, 0);
> +
> return 0;
> }
>
> @@ -534,6 +554,26 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
> return error;
> }
>
> + tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(tsdata->gpio_wake)) {
> + error = PTR_ERR(tsdata->gpio_wake);
> + if (error != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get wake gpio: %d\n", error);
> + return error;
> + }
> +
> + tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(tsdata->gpio_enable)) {
> + error = PTR_ERR(tsdata->gpio_enable);
> + if (error != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get enable gpio: %d\n", error);
> + return error;
> + }
> + if (tsdata->gpio_enable)
> + msleep(100);
> +
> error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
> IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> client->name, tsdata);
> --
> 2.5.0
>
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