diff mbox

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

Message ID 1448018233-27824-5-git-send-email-hdegoede@redhat.com
State Superseded, archived
Headers show

Commit Message

Hans de Goede Nov. 20, 2015, 11:17 a.m. UTC 
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(+)

Comments

Rob Herring (Arm) Nov. 20, 2015, 2:43 p.m. UTC | #1 
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 +

For the binding:

Acked-by: Rob Herring <robh@kernel.org>

>  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);
> +	}
> +
>  	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 (!IS_ERR_OR_NULL(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 (!IS_ERR_OR_NULL(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 (!IS_ERR_OR_NULL(ts->gpio_enable))
> +		gpiod_set_value_cansleep(ts->gpio_enable, 0);
> +
>  	return 0;
>  }
>  
> @@ -534,6 +554,24 @@ 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;
> +	}
> +
>  	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
>  					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
>  					  client->name, tsdata);
> @@ -542,6 +580,14 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  		return error;
>  	}
>  
> +	if (!IS_ERR_OR_NULL(tsdata->gpio_wake))
> +		gpiod_set_value_cansleep(tsdata->gpio_wake, 1);
> +
> +	if (!IS_ERR_OR_NULL(tsdata->gpio_enable)) {
> +		gpiod_set_value_cansleep(tsdata->gpio_enable, 1);
> +		msleep(100);
> +	}
> +
>  	pixcir_reset(tsdata);
>  
>  	/* Always be in IDLE mode to save power, device supports auto wake */
> -- 
> 2.5.0
> 
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Dmitry Torokhov Nov. 20, 2015, 5:27 p.m. UTC | #2 
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.
Hans de Goede Nov. 20, 2015, 6:22 p.m. UTC | #3 
Hi,

On 20-11-15 18:27, Dmitry Torokhov wrote:
> 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.

Yes that will work fine, I believe Sander went with his version because that
is what the existing gpio code (for the also optional reset pin) already does.

So from a consistency pov it is better to keep this patch as is.

> No need to resubmit, just let me know.

Ok, either way is fine with me.

Regards,

Hans
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diff mbox

Patch

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);
+	}
+
 	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 (!IS_ERR_OR_NULL(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 (!IS_ERR_OR_NULL(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 (!IS_ERR_OR_NULL(ts->gpio_enable))
+		gpiod_set_value_cansleep(ts->gpio_enable, 0);
+
 	return 0;
 }
 
@@ -534,6 +554,24 @@  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;
+	}
+
 	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
 					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 					  client->name, tsdata);
@@ -542,6 +580,14 @@  static int pixcir_i2c_ts_probe(struct i2c_client *client,
 		return error;
 	}
 
+	if (!IS_ERR_OR_NULL(tsdata->gpio_wake))
+		gpiod_set_value_cansleep(tsdata->gpio_wake, 1);
+
+	if (!IS_ERR_OR_NULL(tsdata->gpio_enable)) {
+		gpiod_set_value_cansleep(tsdata->gpio_enable, 1);
+		msleep(100);
+	}
+
 	pixcir_reset(tsdata);
 
 	/* Always be in IDLE mode to save power, device supports auto wake */