linux-kernel - Re: [PATCHv4 8/9] extcon: gpio: Use devm_extcon_dev_allocate for extcon

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Date:	Fri, 25 Apr 2014 10:18:11 -0500
From:	Felipe Balbi <balbi@...com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
CC:	<linux-kernel@...r.kernel.org>, <myungjoo.ham@...sung.com>,
	<balbi@...com>, <gg@...mlogic.co.uk>, <kishon@...com>,
	<ckeepax@...nsource.wolfsonmicro.com>, <broonie@...nel.org>,
	<k.kozlowski@...sung.com>, <kyungmin.park@...sung.com>
Subject: Re: [PATCHv4 8/9] extcon: gpio: Use devm_extcon_dev_allocate for
 extcon_dev

On Fri, Apr 25, 2014 at 09:42:23AM +0900, Chanwoo Choi wrote:
> This patch use devm_extcon_dev_allocate() to simplify the memory control
> of extcon device.
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>

Reviewed-by: Felipe Balbi <balbi@...com>

> ---
>  drivers/extcon/extcon-gpio.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index 43af34c..645b283 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -32,7 +32,7 @@
>  #include <linux/extcon/extcon-gpio.h>
>  
>  struct gpio_extcon_data {
> -	struct extcon_dev edev;
> +	struct extcon_dev *edev;
>  	unsigned gpio;
>  	bool gpio_active_low;
>  	const char *state_on;
> @@ -53,7 +53,7 @@ static void gpio_extcon_work(struct work_struct *work)
>  	state = gpio_get_value(data->gpio);
>  	if (data->gpio_active_low)
>  		state = !state;
> -	extcon_set_state(&data->edev, state);
> +	extcon_set_state(data->edev, state);
>  }
>  
>  static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
> @@ -67,9 +67,10 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
>  
>  static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
>  {
> -	struct gpio_extcon_data	*extcon_data =
> -		container_of(edev, struct gpio_extcon_data, edev);
> +	struct device *dev = edev->dev.parent;
> +	struct gpio_extcon_data *extcon_data = dev_get_drvdata(dev);
>  	const char *state;
> +
>  	if (extcon_get_state(edev))
>  		state = extcon_data->state_on;
>  	else
> @@ -98,15 +99,21 @@ static int gpio_extcon_probe(struct platform_device *pdev)
>  	if (!extcon_data)
>  		return -ENOMEM;
>  
> -	extcon_data->edev.name = pdata->name;
> -	extcon_data->edev.dev.parent = &pdev->dev;
> +	extcon_data->edev = devm_extcon_dev_allocate(&pdev->dev, NULL);
> +	if (IS_ERR(extcon_data->edev)) {
> +		dev_err(&pdev->dev, "failed to allocate extcon device\n");
> +		return -ENOMEM;
> +	}
> +	extcon_data->edev->name = pdata->name;
> +	extcon_data->edev->dev.parent = &pdev->dev;
> +
>  	extcon_data->gpio = pdata->gpio;
>  	extcon_data->gpio_active_low = pdata->gpio_active_low;
>  	extcon_data->state_on = pdata->state_on;
>  	extcon_data->state_off = pdata->state_off;
>  	extcon_data->check_on_resume = pdata->check_on_resume;
>  	if (pdata->state_on && pdata->state_off)
> -		extcon_data->edev.print_state = extcon_gpio_print_state;
> +		extcon_data->edev->print_state = extcon_gpio_print_state;
>  
>  	ret = devm_gpio_request_one(&pdev->dev, extcon_data->gpio, GPIOF_DIR_IN,
>  				    pdev->name);
> @@ -121,7 +128,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
>  				msecs_to_jiffies(pdata->debounce);
>  	}
>  
> -	ret = devm_extcon_dev_register(&pdev->dev, &extcon_data->edev);
> +	ret = devm_extcon_dev_register(&pdev->dev, extcon_data->edev);
>  	if (ret < 0)
>  		return ret;
>  
> -- 
> 1.8.0
> 

-- 
balbi

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