Re: [PATCH 4/8] extcon: gpio: Convert to fully use GPIO descriptor

[Chanwoo Choi <cw00.choi@samsung.com>]

Hi Linus,

Looks good to me. But, there is one comment
of gpiod_to_irq()'s return value.

If you modify it, feel free to add my tag:
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>

On 2017년 09월 24일 23:56, Linus Walleij wrote:
> Since we are not getting the GPIO from any platform data and global
> GPIO numberspace, we simply get the named "extcon" GPIO directly from
> the device. Cut away "active low" since GPIO descriptors already know
> if the line is active high or low. Simplify a bit with a
> struct device *dev helper variable in probe() and cut the complex
> init() function.
> 
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
>  drivers/extcon/extcon-gpio.c | 66 ++++++++++----------------------------------
>  1 file changed, 15 insertions(+), 51 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index 9c4094edd123..86f3ec6d6014 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -18,7 +18,6 @@
>   */
>  
>  #include <linux/extcon.h>
> -#include <linux/gpio.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/init.h>
>  #include <linux/interrupt.h>
> @@ -35,12 +34,8 @@
>   * @work:		Work fired by the interrupt.
>   * @debounce_jiffies:	Number of jiffies to wait for the GPIO to stabilize, from the debounce
>   *			value.
> - * @id_gpiod:		GPIO descriptor for this external connector.
> + * @gpiod:		GPIO descriptor for this external connector.
>   * @extcon_id:		The unique id of specific external connector.
> - * @gpio:		Corresponding GPIO.
> - * @gpio_active_low:	Boolean describing whether gpio active state is 1 or 0
> - *			If true, low state of gpio means active.
> - *			If false, high state of gpio means active.
>   * @debounce:		Debounce time for GPIO IRQ in ms.
>   * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).
>   * @check_on_resume:	Boolean describing whether to check the state of gpio
> @@ -51,10 +46,8 @@ struct gpio_extcon_data {
>  	int irq;
>  	struct delayed_work work;
>  	unsigned long debounce_jiffies;
> -	struct gpio_desc *id_gpiod;
> +	struct gpio_desc *gpiod;
>  	unsigned int extcon_id;
> -	unsigned gpio;
> -	bool gpio_active_low;
>  	unsigned long debounce;
>  	unsigned long irq_flags;
>  	bool check_on_resume;
> @@ -67,10 +60,7 @@ static void gpio_extcon_work(struct work_struct *work)
>  		container_of(to_delayed_work(work), struct gpio_extcon_data,
>  			     work);
>  
> -	state = gpiod_get_value_cansleep(data->id_gpiod);
> -	if (data->gpio_active_low)
> -		state = !state;
> -
> +	state = gpiod_get_value_cansleep(data->gpiod);
>  	extcon_set_state_sync(data->edev, data->extcon_id, state);
>  }
>  
> @@ -83,60 +73,34 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
> -{
> -	int ret;
> -
> -	ret = devm_gpio_request_one(dev, data->gpio, GPIOF_DIR_IN,
> -				dev_name(dev));
> -	if (ret < 0)
> -		return ret;
> -
> -	data->id_gpiod = gpio_to_desc(data->gpio);
> -	if (!data->id_gpiod)
> -		return -EINVAL;
> -
> -	if (data->debounce) {
> -		ret = gpiod_set_debounce(data->id_gpiod,
> -					 data->debounce * 1000);
> -		if (ret < 0)
> -			data->debounce_jiffies =
> -				msecs_to_jiffies(data->debounce);
> -	}
> -
> -	data->irq = gpiod_to_irq(data->id_gpiod);
> -	if (data->irq < 0)
> -		return data->irq;
> -
> -	return 0;
> -}
> -
>  static int gpio_extcon_probe(struct platform_device *pdev)
>  {
>  	struct gpio_extcon_data *data;
> +	struct device *dev = &pdev->dev;
>  	int ret;
>  
> -	data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
> -				   GFP_KERNEL);
> +	data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL);
>  	if (!data)
>  		return -ENOMEM;
>  
>  	if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
>  		return -EINVAL;
>  
> -	/* Initialize the gpio */
> -	ret = gpio_extcon_init(&pdev->dev, data);
> -	if (ret < 0)
> -		return ret;
> +	data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);
> +	if (IS_ERR(data->gpiod))
> +		return PTR_ERR(data->gpiod);
> +	data->irq = gpiod_to_irq(data->gpiod);
> +	if (data->irq <= 0)

"if (data->irq < 0)" is enough. If irq is zero, gpiod_to_irq()
returns the -ENXIO.

> +		return data->irq;
>  
>  	/* Allocate the memory of extcon devie and register extcon device */
> -	data->edev = devm_extcon_dev_allocate(&pdev->dev, &data->extcon_id);
> +	data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);
>  	if (IS_ERR(data->edev)) {
> -		dev_err(&pdev->dev, "failed to allocate extcon device\n");
> +		dev_err(dev, "failed to allocate extcon device\n");
>  		return -ENOMEM;
>  	}
>  
> -	ret = devm_extcon_dev_register(&pdev->dev, data->edev);
> +	ret = devm_extcon_dev_register(dev, data->edev);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -146,7 +110,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
>  	 * Request the interrupt of gpio to detect whether external connector
>  	 * is attached or detached.
>  	 */
> -	ret = devm_request_any_context_irq(&pdev->dev, data->irq,
> +	ret = devm_request_any_context_irq(dev, data->irq,
>  					gpio_irq_handler, data->irq_flags,
>  					pdev->name, data);
>  	if (ret < 0)
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics