linux-kernel - Re: [PATCH v3] backlight: Convert from Legacy pm ops to dev_pm

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Message-id: <001a01ce6010$3daaf3c0$b900db40$@samsung.com>
Date:	Mon, 03 Jun 2013 13:10:10 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	'Shuah Khan' <shuah.kh@...sung.com>
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	shuahkhan@...il.com, rpurdie@...ys.net, FlorianSchandinat@....de,
	plagnioj@...osoft.com, tomi.valkeinen@...com,
	rafael.j.wysocki@...el.com, Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH v3] backlight: Convert from Legacy pm ops to dev_pm_ops

On Sunday, June 02, 2013 8:07 AM, Shuah Khan wrote:
> 
> Convert drivers/video/backlight/class to use dev_pm_ops for power
> management and remove Legacy PM ops hooks. With this change, backlight
> class registers suspend/resume callbacks via class->pm (dev_pm_ops)
> instead of Legacy class->suspend/resume. When __device_suspend() runs
> call-backs, it will find class->pm ops for the backlight class.
> 
> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
> Cc: Shuah Khan <shuahkhan@...il.com>

CC'ed Andrew Morton,

It looks good.

Acked-by: Jingoo Han <jg1.han@...sung.com>


Best regards,
Jingoo Han

> ---
> 
> v2: Updated changelog to correct device class.
> v3: Updated changelog to correct device class.
> 
>  drivers/video/backlight/backlight.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
> index c74e7aa..0ffb251 100644
> --- a/drivers/video/backlight/backlight.c
> +++ b/drivers/video/backlight/backlight.c
> @@ -208,7 +208,7 @@ static ssize_t backlight_show_actual_brightness(struct device *dev,
> 
>  static struct class *backlight_class;
> 
> -static int backlight_suspend(struct device *dev, pm_message_t state)
> +static int backlight_suspend(struct device *dev)
>  {
>  	struct backlight_device *bd = to_backlight_device(dev);
> 
> @@ -236,6 +236,9 @@ static int backlight_resume(struct device *dev)
>  	return 0;
>  }
> 
> +static SIMPLE_DEV_PM_OPS(backlight_class_dev_pm_ops, backlight_suspend,
> +			 backlight_resume);
> +
>  static void bl_device_release(struct device *dev)
>  {
>  	struct backlight_device *bd = to_backlight_device(dev);
> @@ -414,8 +417,7 @@ static int __init backlight_class_init(void)
>  	}
> 
>  	backlight_class->dev_attrs = bl_device_attributes;
> -	backlight_class->suspend = backlight_suspend;
> -	backlight_class->resume = backlight_resume;
> +	backlight_class->pm = &backlight_class_dev_pm_ops;
>  	return 0;
>  }
> 
> --
> 1.7.10.4
> 


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