[PATCH] Input: pixcir_i2c_ts - Add RESET gpio

[PATCH] Input: pixcir_i2c_ts - Add RESET gpio

[Roger Quadros]

The controller has a RESET pin which is usually controlled over
a GPIO line. If such a GPIO is provided, perform a RESET
during probe.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 .../bindings/input/touchscreen/pixcir_i2c_ts.txt   |  3 ++
 drivers/input/touchscreen/pixcir_i2c_ts.c          | 37 ++++++++++++++++++++--
 include/linux/input/pixcir_ts.h                    |  1 +
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
index 6e55109..8eb240a 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
@@ -8,6 +8,9 @@ Required properties:
 - touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
 - touchscreen-size-y: vertical resolution of touchscreen (in pixels)
 
+Optional properties:
+- reset-gpio: GPIO connected to the RESET line of the chip
+
 Example:
 
 	i2c@00000000 {
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 4fb5537..610ce0b 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -51,6 +51,19 @@ struct pixcir_report_data {
 	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
 };
 
+static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
+{
+	const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
+
+	if (gpio_is_valid(pdata->gpio_reset)) {
+		gpio_set_value(pdata->gpio_reset, 1);
+		ndelay(80);
+		gpio_set_value(pdata->gpio_reset, 0);
+		/* wait as controller might not immediately respond */
+		msleep(100);
+	}
+}
+
 static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
 			    struct pixcir_report_data *report)
 {
@@ -428,7 +441,8 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
 	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
 
 	pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
-	/* gpio_attb validity is checked in probe */
+	pdata->gpio_reset = of_get_named_gpio(np, "reset-gpio", 0);
+	/* gpio validity is checked in probe */
 
 	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
 		dev_err(dev, "Failed to get touchscreen-size-x property\n");
@@ -442,8 +456,9 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
 	}
 	pdata->y_max -= 1;
 
-	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
-		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
+	dev_dbg(dev, "%s: x %d, y %d, ATTB gpio %d, RESET gpio %d\n", __func__,
+		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb,
+		pdata->gpio_reset);
 
 	return pdata;
 }
@@ -481,6 +496,10 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
+	/* RESET gpio is optional */
+	if (!gpio_is_valid(pdata->gpio_reset))
+		dev_info(dev, "Invalid gpio_reset in pdata\n");
+
 	if (!pdata->chip.max_fingers) {
 		dev_err(dev, "Invalid max_fingers in pdata\n");
 		return -EINVAL;
@@ -530,6 +549,16 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
 
 	input_set_drvdata(input, tsdata);
 
+	if (gpio_is_valid(pdata->gpio_reset)) {
+		error = devm_gpio_request_one(dev, pdata->gpio_reset,
+					      GPIOF_OUT_INIT_LOW,
+					      "pixcir_i2c_reset");
+		if (error) {
+			dev_err(dev, "Failed to request RESET gpio\n");
+			return error;
+		}
+	}
+
 	error = devm_gpio_request_one(dev, pdata->gpio_attb,
 				      GPIOF_DIR_IN, "pixcir_i2c_attb");
 	if (error) {
@@ -545,6 +574,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
 		return error;
 	}
 
+	pixcir_reset(tsdata);
+
 	/* Always be in IDLE mode to save power, device supports auto wake */
 	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
 	if (error) {
diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
index 7bae83b..9e91fd3 100644
--- a/include/linux/input/pixcir_ts.h
+++ b/include/linux/input/pixcir_ts.h
@@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
 	int x_max;
 	int y_max;
 	int gpio_attb;		/* GPIO connected to ATTB line */
+	int gpio_reset;		/* GPIO connected to RESET line */
 	struct pixcir_i2c_chip_data chip;
 };
 
-- 
2.1.0

Re: [PATCH] Input: pixcir_i2c_ts - Add RESET gpio

[Dmitry Torokhov]

Hi Roger,

On Fri, Feb 06, 2015 at 02:53:10PM +0200, Roger Quadros wrote:
> The controller has a RESET pin which is usually controlled over
> a GPIO line. If such a GPIO is provided, perform a RESET
> during probe.
> 
> Signed-off-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
> ---
>  .../bindings/input/touchscreen/pixcir_i2c_ts.txt   |  3 ++
>  drivers/input/touchscreen/pixcir_i2c_ts.c          | 37 ++++++++++++++++++++--
>  include/linux/input/pixcir_ts.h                    |  1 +
>  3 files changed, 38 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> index 6e55109..8eb240a 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> @@ -8,6 +8,9 @@ Required properties:
>  - touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
>  - touchscreen-size-y: vertical resolution of touchscreen (in pixels)
>  
> +Optional properties:
> +- reset-gpio: GPIO connected to the RESET line of the chip
> +
>  Example:
>  
>  	i2c@00000000 {
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 4fb5537..610ce0b 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -51,6 +51,19 @@ struct pixcir_report_data {
>  	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
>  };
>  
> +static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
> +{
> +	const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
> +
> +	if (gpio_is_valid(pdata->gpio_reset)) {
> +		gpio_set_value(pdata->gpio_reset, 1);
> +		ndelay(80);
> +		gpio_set_value(pdata->gpio_reset, 0);
> +		/* wait as controller might not immediately respond */
> +		msleep(100);
> +	}
> +}
> +
>  static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
>  			    struct pixcir_report_data *report)
>  {
> @@ -428,7 +441,8 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>  	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
>  
>  	pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
> -	/* gpio_attb validity is checked in probe */
> +	pdata->gpio_reset = of_get_named_gpio(np, "reset-gpio", 0);
> +	/* gpio validity is checked in probe */
>  
>  	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
>  		dev_err(dev, "Failed to get touchscreen-size-x property\n");
> @@ -442,8 +456,9 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>  	}
>  	pdata->y_max -= 1;
>  
> -	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
> -		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
> +	dev_dbg(dev, "%s: x %d, y %d, ATTB gpio %d, RESET gpio %d\n", __func__,
> +		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb,
> +		pdata->gpio_reset);
>  
>  	return pdata;
>  }
> @@ -481,6 +496,10 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  		return -EINVAL;
>  	}
>  
> +	/* RESET gpio is optional */
> +	if (!gpio_is_valid(pdata->gpio_reset))
> +		dev_info(dev, "Invalid gpio_reset in pdata\n");
> +
>  	if (!pdata->chip.max_fingers) {
>  		dev_err(dev, "Invalid max_fingers in pdata\n");
>  		return -EINVAL;
> @@ -530,6 +549,16 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  
>  	input_set_drvdata(input, tsdata);
>  
> +	if (gpio_is_valid(pdata->gpio_reset)) {
> +		error = devm_gpio_request_one(dev, pdata->gpio_reset,
> +					      GPIOF_OUT_INIT_LOW,
> +					      "pixcir_i2c_reset");
> +		if (error) {
> +			dev_err(dev, "Failed to request RESET gpio\n");
> +			return error;
> +		}
> +	}
> +
>  	error = devm_gpio_request_one(dev, pdata->gpio_attb,
>  				      GPIOF_DIR_IN, "pixcir_i2c_attb");
>  	if (error) {
> @@ -545,6 +574,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  		return error;
>  	}
>  
> +	pixcir_reset(tsdata);
> +
>  	/* Always be in IDLE mode to save power, device supports auto wake */
>  	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
>  	if (error) {
> diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
> index 7bae83b..9e91fd3 100644
> --- a/include/linux/input/pixcir_ts.h
> +++ b/include/linux/input/pixcir_ts.h
> @@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
>  	int x_max;
>  	int y_max;
>  	int gpio_attb;		/* GPIO connected to ATTB line */
> +	int gpio_reset;		/* GPIO connected to RESET line */
>  	struct pixcir_i2c_chip_data chip;

Declaring gpio_reset like this means that non-OF platforms will have it
as 0, which is usually a valid gpio number, which means they'll get a
nasty surprise when they update the driver.

Maybe we should add a flag, or at least document that it should be set
to -1 if not available (since I do not see non-OF users in the tree)?

Thanks.

-- 
Dmitry
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Re: [PATCH] Input: pixcir_i2c_ts - Add RESET gpio

[Roger Quadros]

Hi Dmitry,

On 06/02/15 18:54, Dmitry Torokhov wrote:
> Hi Roger,
> 
> On Fri, Feb 06, 2015 at 02:53:10PM +0200, Roger Quadros wrote:
>> The controller has a RESET pin which is usually controlled over
>> a GPIO line. If such a GPIO is provided, perform a RESET
>> during probe.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> ---
>>  .../bindings/input/touchscreen/pixcir_i2c_ts.txt   |  3 ++
>>  drivers/input/touchscreen/pixcir_i2c_ts.c          | 37 ++++++++++++++++++++--
>>  include/linux/input/pixcir_ts.h                    |  1 +
>>  3 files changed, 38 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
>> index 6e55109..8eb240a 100644
>> --- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
>> +++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
>> @@ -8,6 +8,9 @@ Required properties:
>>  - touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
>>  - touchscreen-size-y: vertical resolution of touchscreen (in pixels)
>>  
>> +Optional properties:
>> +- reset-gpio: GPIO connected to the RESET line of the chip
>> +
>>  Example:
>>  
>>  	i2c@00000000 {
>> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
>> index 4fb5537..610ce0b 100644
>> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
>> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
>> @@ -51,6 +51,19 @@ struct pixcir_report_data {
>>  	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
>>  };
>>  
>> +static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
>> +{
>> +	const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
>> +
>> +	if (gpio_is_valid(pdata->gpio_reset)) {
>> +		gpio_set_value(pdata->gpio_reset, 1);
>> +		ndelay(80);
>> +		gpio_set_value(pdata->gpio_reset, 0);
>> +		/* wait as controller might not immediately respond */
>> +		msleep(100);
>> +	}
>> +}
>> +
>>  static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
>>  			    struct pixcir_report_data *report)
>>  {
>> @@ -428,7 +441,8 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>>  	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
>>  
>>  	pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
>> -	/* gpio_attb validity is checked in probe */
>> +	pdata->gpio_reset = of_get_named_gpio(np, "reset-gpio", 0);
>> +	/* gpio validity is checked in probe */
>>  
>>  	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
>>  		dev_err(dev, "Failed to get touchscreen-size-x property\n");
>> @@ -442,8 +456,9 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>>  	}
>>  	pdata->y_max -= 1;
>>  
>> -	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
>> -		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
>> +	dev_dbg(dev, "%s: x %d, y %d, ATTB gpio %d, RESET gpio %d\n", __func__,
>> +		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb,
>> +		pdata->gpio_reset);
>>  
>>  	return pdata;
>>  }
>> @@ -481,6 +496,10 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>>  		return -EINVAL;
>>  	}
>>  
>> +	/* RESET gpio is optional */
>> +	if (!gpio_is_valid(pdata->gpio_reset))
>> +		dev_info(dev, "Invalid gpio_reset in pdata\n");
>> +
>>  	if (!pdata->chip.max_fingers) {
>>  		dev_err(dev, "Invalid max_fingers in pdata\n");
>>  		return -EINVAL;
>> @@ -530,6 +549,16 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>>  
>>  	input_set_drvdata(input, tsdata);
>>  
>> +	if (gpio_is_valid(pdata->gpio_reset)) {
>> +		error = devm_gpio_request_one(dev, pdata->gpio_reset,
>> +					      GPIOF_OUT_INIT_LOW,
>> +					      "pixcir_i2c_reset");
>> +		if (error) {
>> +			dev_err(dev, "Failed to request RESET gpio\n");
>> +			return error;
>> +		}
>> +	}
>> +
>>  	error = devm_gpio_request_one(dev, pdata->gpio_attb,
>>  				      GPIOF_DIR_IN, "pixcir_i2c_attb");
>>  	if (error) {
>> @@ -545,6 +574,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>>  		return error;
>>  	}
>>  
>> +	pixcir_reset(tsdata);
>> +
>>  	/* Always be in IDLE mode to save power, device supports auto wake */
>>  	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
>>  	if (error) {
>> diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
>> index 7bae83b..9e91fd3 100644
>> --- a/include/linux/input/pixcir_ts.h
>> +++ b/include/linux/input/pixcir_ts.h
>> @@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
>>  	int x_max;
>>  	int y_max;
>>  	int gpio_attb;		/* GPIO connected to ATTB line */
>> +	int gpio_reset;		/* GPIO connected to RESET line */
>>  	struct pixcir_i2c_chip_data chip;
> 
> Declaring gpio_reset like this means that non-OF platforms will have it
> as 0, which is usually a valid gpio number, which means they'll get a
> nasty surprise when they update the driver.
> 
> Maybe we should add a flag, or at least document that it should be set
> to -1 if not available (since I do not see non-OF users in the tree)?
> 

Yes, I'll add a note to set this to -1 for non-OF users.

cheers,
-roger

[PATCH v2] Input: pixcir_i2c_ts - Add RESET gpio

[Roger Quadros]

The controller has a RESET pin which is usually controlled over
a GPIO line. If such a GPIO is provided, perform a RESET
during probe.

Signed-off-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
---
  .../bindings/input/touchscreen/pixcir_i2c_ts.txt   |  3 ++
  drivers/input/touchscreen/pixcir_i2c_ts.c          | 37 ++++++++++++++++++++--
  include/linux/input/pixcir_ts.h                    |  1 +
  3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
index 6e55109..8eb240a 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
@@ -8,6 +8,9 @@ Required properties:
  - touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
  - touchscreen-size-y: vertical resolution of touchscreen (in pixels)
  
+Optional properties:
+- reset-gpio: GPIO connected to the RESET line of the chip
+
  Example:
  
  	i2c@00000000 {
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 2c21071..80c956d 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -51,6 +51,19 @@ struct pixcir_report_data {
  	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
  };
  
+static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
+{
+	const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
+
+	if (gpio_is_valid(pdata->gpio_reset)) {
+		gpio_set_value(pdata->gpio_reset, 1);
+		ndelay(100);	/* datasheet section 1.2.3 says 80ns min. */
+		gpio_set_value(pdata->gpio_reset, 0);
+		/* wait for controller ready. 100ms guess. */
+		msleep(100);
+	}
+}
+
  static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
  			    struct pixcir_report_data *report)
  {
@@ -428,7 +441,8 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
  	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
  
  	pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
-	/* gpio_attb validity is checked in probe */
+	pdata->gpio_reset = of_get_named_gpio(np, "reset-gpio", 0);
+	/* gpio validity is checked in probe */
  
  	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
  		dev_err(dev, "Failed to get touchscreen-size-x property\n");
@@ -442,8 +456,9 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
  	}
  	pdata->y_max -= 1;
  
-	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
-		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
+	dev_dbg(dev, "%s: x %d, y %d, ATTB gpio %d, RESET gpio %d\n", __func__,
+		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb,
+		pdata->gpio_reset);
  
  	return pdata;
  }
@@ -481,6 +496,10 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
  		return -EINVAL;
  	}
  
+	/* RESET gpio is optional */
+	if (!gpio_is_valid(pdata->gpio_reset))
+		dev_info(dev, "Invalid gpio_reset in pdata\n");
+
  	if (!pdata->chip.max_fingers) {
  		dev_err(dev, "Invalid max_fingers in pdata\n");
  		return -EINVAL;
@@ -530,6 +549,16 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
  
  	input_set_drvdata(input, tsdata);
  
+	if (gpio_is_valid(pdata->gpio_reset)) {
+		error = devm_gpio_request_one(dev, pdata->gpio_reset,
+					      GPIOF_OUT_INIT_LOW,
+					      "pixcir_i2c_reset");
+		if (error) {
+			dev_err(dev, "Failed to request RESET gpio\n");
+			return error;
+		}
+	}
+
  	error = devm_gpio_request_one(dev, pdata->gpio_attb,
  				      GPIOF_DIR_IN, "pixcir_i2c_attb");
  	if (error) {
@@ -545,6 +574,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
  		return error;
  	}
  
+	pixcir_reset(tsdata);
+
  	/* Always be in IDLE mode to save power, device supports auto wake */
  	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
  	if (error) {
diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
index 7bae83b..5b204dd 100644
--- a/include/linux/input/pixcir_ts.h
+++ b/include/linux/input/pixcir_ts.h
@@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
  	int x_max;
  	int y_max;
  	int gpio_attb;		/* GPIO connected to ATTB line */
+	int gpio_reset;		/* GPIO to RESET line. Set to -1 if unused */
  	struct pixcir_i2c_chip_data chip;
  };
  
-- 
2.1.4


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Re: [PATCH v2] Input: pixcir_i2c_ts - Add RESET gpio

[Roger Quadros]

Hi Dmitry,

On 02/06/15 12:33, Roger Quadros wrote:
> The controller has a RESET pin which is usually controlled over
> a GPIO line. If such a GPIO is provided, perform a RESET
> during probe.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>

Could you please pick this up for v4.3? Thanks.

cheers,
-roger

> ---
>   .../bindings/input/touchscreen/pixcir_i2c_ts.txt   |  3 ++
>   drivers/input/touchscreen/pixcir_i2c_ts.c          | 37
> ++++++++++++++++++++--
>   include/linux/input/pixcir_ts.h                    |  1 +
>   3 files changed, 38 insertions(+), 3 deletions(-)
>
> diff --git
> a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> index 6e55109..8eb240a 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> @@ -8,6 +8,9 @@ Required properties:
>   - touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
>   - touchscreen-size-y: vertical resolution of touchscreen (in pixels)
>
> +Optional properties:
> +- reset-gpio: GPIO connected to the RESET line of the chip
> +
>   Example:
>
>       i2c@00000000 {
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c
> b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 2c21071..80c956d 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -51,6 +51,19 @@ struct pixcir_report_data {
>       struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
>   };
>
> +static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
> +{
> +    const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
> +
> +    if (gpio_is_valid(pdata->gpio_reset)) {
> +        gpio_set_value(pdata->gpio_reset, 1);
> +        ndelay(100);    /* datasheet section 1.2.3 says 80ns min. */
> +        gpio_set_value(pdata->gpio_reset, 0);
> +        /* wait for controller ready. 100ms guess. */
> +        msleep(100);
> +    }
> +}
> +
>   static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
>                   struct pixcir_report_data *report)
>   {
> @@ -428,7 +441,8 @@ static struct pixcir_ts_platform_data
> *pixcir_parse_dt(struct device *dev)
>       pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
>
>       pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
> -    /* gpio_attb validity is checked in probe */
> +    pdata->gpio_reset = of_get_named_gpio(np, "reset-gpio", 0);
> +    /* gpio validity is checked in probe */
>
>       if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
>           dev_err(dev, "Failed to get touchscreen-size-x property\n");
> @@ -442,8 +456,9 @@ static struct pixcir_ts_platform_data
> *pixcir_parse_dt(struct device *dev)
>       }
>       pdata->y_max -= 1;
>
> -    dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
> -        pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
> +    dev_dbg(dev, "%s: x %d, y %d, ATTB gpio %d, RESET gpio %d\n",
> __func__,
> +        pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb,
> +        pdata->gpio_reset);
>
>       return pdata;
>   }
> @@ -481,6 +496,10 @@ static int pixcir_i2c_ts_probe(struct i2c_client
> *client,
>           return -EINVAL;
>       }
>
> +    /* RESET gpio is optional */
> +    if (!gpio_is_valid(pdata->gpio_reset))
> +        dev_info(dev, "Invalid gpio_reset in pdata\n");
> +
>       if (!pdata->chip.max_fingers) {
>           dev_err(dev, "Invalid max_fingers in pdata\n");
>           return -EINVAL;
> @@ -530,6 +549,16 @@ static int pixcir_i2c_ts_probe(struct i2c_client
> *client,
>
>       input_set_drvdata(input, tsdata);
>
> +    if (gpio_is_valid(pdata->gpio_reset)) {
> +        error = devm_gpio_request_one(dev, pdata->gpio_reset,
> +                          GPIOF_OUT_INIT_LOW,
> +                          "pixcir_i2c_reset");
> +        if (error) {
> +            dev_err(dev, "Failed to request RESET gpio\n");
> +            return error;
> +        }
> +    }
> +
>       error = devm_gpio_request_one(dev, pdata->gpio_attb,
>                         GPIOF_DIR_IN, "pixcir_i2c_attb");
>       if (error) {
> @@ -545,6 +574,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client
> *client,
>           return error;
>       }
>
> +    pixcir_reset(tsdata);
> +
>       /* Always be in IDLE mode to save power, device supports auto wake */
>       error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
>       if (error) {
> diff --git a/include/linux/input/pixcir_ts.h
> b/include/linux/input/pixcir_ts.h
> index 7bae83b..5b204dd 100644
> --- a/include/linux/input/pixcir_ts.h
> +++ b/include/linux/input/pixcir_ts.h
> @@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
>       int x_max;
>       int y_max;
>       int gpio_attb;        /* GPIO connected to ATTB line */
> +    int gpio_reset;        /* GPIO to RESET line. Set to -1 if unused */
>       struct pixcir_i2c_chip_data chip;
>   };
>