[PATCHv3,5/5] Input: EXC3000: Add reset gpio support
diff mbox series

Message ID 20200520153936.46869-6-sebastian.reichel@collabora.com
State New
Headers show
Series
  • EXC3000 Updates
Related show

Commit Message

Sebastian Reichel May 20, 2020, 3:39 p.m. UTC
Add basic support for an optional reset gpio.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 .../input/touchscreen/eeti,exc3000.yaml         |  2 ++
 drivers/input/touchscreen/exc3000.c             | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

Comments

Enric Balletbo i Serra May 20, 2020, 4:54 p.m. UTC | #1
Hi Sebastian,

On 20/5/20 17:39, Sebastian Reichel wrote:
> Add basic support for an optional reset gpio.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Thanks to address the comments I did in second version. so,

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

> ---
>  .../input/touchscreen/eeti,exc3000.yaml         |  2 ++
>  drivers/input/touchscreen/exc3000.c             | 17 +++++++++++++++++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml b/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
> index 7e6e23f8fa00..007adbc89c14 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
> +++ b/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
> @@ -22,6 +22,8 @@ properties:
>      const: 0x2a
>    interrupts:
>      maxItems: 1
> +  reset-gpios:
> +    maxItems: 1
>    touchscreen-size-x: true
>    touchscreen-size-y: true
>    touchscreen-inverted-x: true
> diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
> index b5a3bbb63504..de9d0ae1210a 100644
> --- a/drivers/input/touchscreen/exc3000.c
> +++ b/drivers/input/touchscreen/exc3000.c
> @@ -8,7 +8,9 @@
>   */
>  
>  #include <linux/bitops.h>
> +#include <linux/delay.h>
>  #include <linux/device.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/i2c.h>
>  #include <linux/input.h>
>  #include <linux/input/mt.h>
> @@ -33,6 +35,9 @@
>  
>  #define EXC3000_TIMEOUT_MS		100
>  
> +#define EXC3000_RESET_MS		10
> +#define EXC3000_READY_MS		100
> +
>  static const struct i2c_device_id exc3000_id[];
>  
>  struct eeti_dev_info {
> @@ -66,6 +71,7 @@ struct exc3000_data {
>  	const struct eeti_dev_info *info;
>  	struct input_dev *input;
>  	struct touchscreen_properties prop;
> +	struct gpio_desc *reset;
>  	struct timer_list timer;
>  	u8 buf[2 * EXC3000_LEN_FRAME];
>  	struct completion wait_event;
> @@ -325,6 +331,17 @@ static int exc3000_probe(struct i2c_client *client)
>  	init_completion(&data->wait_event);
>  	mutex_init(&data->query_lock);
>  
> +	data->reset = devm_gpiod_get_optional(&client->dev, "reset",
> +					      GPIOD_OUT_HIGH);
> +	if (IS_ERR(data->reset))
> +		return PTR_ERR(data->reset);
> +
> +	if (data->reset) {
> +		msleep(EXC3000_RESET_MS);
> +		gpiod_set_value_cansleep(data->reset, 0);
> +		msleep(EXC3000_READY_MS);
> +	}
> +
>  	input = devm_input_allocate_device(&client->dev);
>  	if (!input)
>  		return -ENOMEM;
>

Patch
diff mbox series

diff --git a/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml b/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
index 7e6e23f8fa00..007adbc89c14 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
@@ -22,6 +22,8 @@  properties:
     const: 0x2a
   interrupts:
     maxItems: 1
+  reset-gpios:
+    maxItems: 1
   touchscreen-size-x: true
   touchscreen-size-y: true
   touchscreen-inverted-x: true
diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
index b5a3bbb63504..de9d0ae1210a 100644
--- a/drivers/input/touchscreen/exc3000.c
+++ b/drivers/input/touchscreen/exc3000.c
@@ -8,7 +8,9 @@ 
  */
 
 #include <linux/bitops.h>
+#include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/input/mt.h>
@@ -33,6 +35,9 @@ 
 
 #define EXC3000_TIMEOUT_MS		100
 
+#define EXC3000_RESET_MS		10
+#define EXC3000_READY_MS		100
+
 static const struct i2c_device_id exc3000_id[];
 
 struct eeti_dev_info {
@@ -66,6 +71,7 @@  struct exc3000_data {
 	const struct eeti_dev_info *info;
 	struct input_dev *input;
 	struct touchscreen_properties prop;
+	struct gpio_desc *reset;
 	struct timer_list timer;
 	u8 buf[2 * EXC3000_LEN_FRAME];
 	struct completion wait_event;
@@ -325,6 +331,17 @@  static int exc3000_probe(struct i2c_client *client)
 	init_completion(&data->wait_event);
 	mutex_init(&data->query_lock);
 
+	data->reset = devm_gpiod_get_optional(&client->dev, "reset",
+					      GPIOD_OUT_HIGH);
+	if (IS_ERR(data->reset))
+		return PTR_ERR(data->reset);
+
+	if (data->reset) {
+		msleep(EXC3000_RESET_MS);
+		gpiod_set_value_cansleep(data->reset, 0);
+		msleep(EXC3000_READY_MS);
+	}
+
 	input = devm_input_allocate_device(&client->dev);
 	if (!input)
 		return -ENOMEM;