* [PATCH] Input: pixcir_i2c_ts - Add RESET gpio
@ 2015-02-06 12:53 Roger Quadros
2015-02-06 16:54 ` Dmitry Torokhov
2015-06-02 9:33 ` [PATCH v2] " Roger Quadros
0 siblings, 2 replies; 5+ messages in thread
From: Roger Quadros @ 2015-02-06 12:53 UTC (permalink / raw)
To: dmitry.torokhov, rydberg
Cc: mugunthanvnm, jg1.han, linux-input, devicetree, linux-kernel,
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
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] Input: pixcir_i2c_ts - Add RESET gpio
2015-02-06 12:53 [PATCH] Input: pixcir_i2c_ts - Add RESET gpio Roger Quadros
@ 2015-02-06 16:54 ` Dmitry Torokhov
2015-02-10 8:33 ` Roger Quadros
2015-06-02 9:33 ` [PATCH v2] " Roger Quadros
1 sibling, 1 reply; 5+ messages in thread
From: Dmitry Torokhov @ 2015-02-06 16:54 UTC (permalink / raw)
To: Roger Quadros
Cc: rydberg, mugunthanvnm, jg1.han, linux-input, devicetree, linux-kernel
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)?
Thanks.
--
Dmitry
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] Input: pixcir_i2c_ts - Add RESET gpio
2015-02-06 16:54 ` Dmitry Torokhov
@ 2015-02-10 8:33 ` Roger Quadros
0 siblings, 0 replies; 5+ messages in thread
From: Roger Quadros @ 2015-02-10 8:33 UTC (permalink / raw)
To: Dmitry Torokhov
Cc: rydberg, mugunthanvnm, jg1.han, linux-input, devicetree, linux-kernel
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
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2] Input: pixcir_i2c_ts - Add RESET gpio
2015-02-06 12:53 [PATCH] Input: pixcir_i2c_ts - Add RESET gpio Roger Quadros
2015-02-06 16:54 ` Dmitry Torokhov
@ 2015-06-02 9:33 ` Roger Quadros
2015-07-06 10:28 ` Roger Quadros
1 sibling, 1 reply; 5+ messages in thread
From: Roger Quadros @ 2015-06-02 9:33 UTC (permalink / raw)
To: dmitry.torokhov, rydberg
Cc: mugunthanvnm, jg1.han, linux-input, devicetree, linux-kernel
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 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
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2] Input: pixcir_i2c_ts - Add RESET gpio
2015-06-02 9:33 ` [PATCH v2] " Roger Quadros
@ 2015-07-06 10:28 ` Roger Quadros
0 siblings, 0 replies; 5+ messages in thread
From: Roger Quadros @ 2015-07-06 10:28 UTC (permalink / raw)
To: dmitry.torokhov, rydberg
Cc: mugunthanvnm, jg1.han, linux-input, devicetree, linux-kernel
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;
> };
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-07-06 10:28 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-02-06 12:53 [PATCH] Input: pixcir_i2c_ts - Add RESET gpio Roger Quadros
2015-02-06 16:54 ` Dmitry Torokhov
2015-02-10 8:33 ` Roger Quadros
2015-06-02 9:33 ` [PATCH v2] " Roger Quadros
2015-07-06 10:28 ` Roger Quadros
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