linux-kernel - Re: [PATCH RFT] leds: max8997: Simplify max8997_led_set

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Message-ID: <CAK5ve-KStwA6VWXMncSoehTf7JwHGq0Kj4fg8b3--6WaL+8T9w@mail.gmail.com>
Date:	Tue, 24 Jul 2012 15:56:45 +0800
From:	Bryan Wu <bryan.wu@...onical.com>
To:	Axel Lin <axel.lin@...il.com>
Cc:	Donggeun Kim <dg77.kim@...sung.com>,
	Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFT] leds: max8997: Simplify max8997_led_set_mode implementation

On Tue, Jul 24, 2012 at 2:29 PM, Axel Lin <axel.lin@...il.com> wrote:
> It is not necessary to call max8997_update_reg() twice just for updating
> MAX8997_REG_LEN_CNTL register. With proper val and mask arguments to
> max8997_update_reg() call, this can be done in one max8997_update_reg() call.
> And then we can remove max8997_led_clear_mode() function.
>
> Signed-off-by: Axel Lin <axel.lin@...il.com>

Fair enough, I've applied it to my for-next.

Thanks,
-Bryan

> ---
>  drivers/leds/leds-max8997.c |   60 ++++++++++---------------------------------
>  1 file changed, 13 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/leds/leds-max8997.c b/drivers/leds/leds-max8997.c
> index bf86d54..569e36d 100644
> --- a/drivers/leds/leds-max8997.c
> +++ b/drivers/leds/leds-max8997.c
> @@ -49,71 +49,37 @@ struct max8997_led {
>         struct mutex mutex;
>  };
>
> -static void max8997_led_clear_mode(struct max8997_led *led,
> -                       enum max8997_led_mode mode)
> -{
> -       struct i2c_client *client = led->iodev->i2c;
> -       u8 val = 0, mask = 0;
> -       int ret;
> -
> -       switch (mode) {
> -       case MAX8997_FLASH_MODE:
> -               mask = led->id ?
> -                     MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
> -               break;
> -       case MAX8997_MOVIE_MODE:
> -               mask = led->id ?
> -                     MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
> -               break;
> -       case MAX8997_FLASH_PIN_CONTROL_MODE:
> -               mask = led->id ?
> -                     MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
> -               break;
> -       case MAX8997_MOVIE_PIN_CONTROL_MODE:
> -               mask = led->id ?
> -                     MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
> -               break;
> -       default:
> -               break;
> -       }
> -
> -       if (mask) {
> -               ret = max8997_update_reg(client,
> -                               MAX8997_REG_LEN_CNTL, val, mask);
> -               if (ret)
> -                       dev_err(led->iodev->dev,
> -                               "failed to update register(%d)\n", ret);
> -       }
> -}
> -
>  static void max8997_led_set_mode(struct max8997_led *led,
>                         enum max8997_led_mode mode)
>  {
>         int ret;
>         struct i2c_client *client = led->iodev->i2c;
> -       u8 mask = 0;
> -
> -       /* First, clear the previous mode */
> -       max8997_led_clear_mode(led, led->led_mode);
> +       u8 mask = 0, val;
>
>         switch (mode) {
>         case MAX8997_FLASH_MODE:
> -               mask = led->id ?
> +               mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
> +               val = led->id ?
>                       MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
>                 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
>                 break;
>         case MAX8997_MOVIE_MODE:
> -               mask = led->id ?
> +               mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
> +               val = led->id ?
>                       MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
>                 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
>                 break;
>         case MAX8997_FLASH_PIN_CONTROL_MODE:
> -               mask = led->id ?
> +               mask = MAX8997_LED1_FLASH_PIN_MASK |
> +                      MAX8997_LED0_FLASH_PIN_MASK;
> +               val = led->id ?
>                       MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
>                 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
>                 break;
>         case MAX8997_MOVIE_PIN_CONTROL_MODE:
> -               mask = led->id ?
> +               mask = MAX8997_LED1_MOVIE_PIN_MASK |
> +                      MAX8997_LED0_MOVIE_PIN_MASK;
> +               val = led->id ?
>                       MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
>                 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
>                 break;
> @@ -123,8 +89,8 @@ static void max8997_led_set_mode(struct max8997_led *led,
>         }
>
>         if (mask) {
> -               ret = max8997_update_reg(client,
> -                               MAX8997_REG_LEN_CNTL, mask, mask);
> +               ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
> +                                        mask);
>                 if (ret)
>                         dev_err(led->iodev->dev,
>                                 "failed to update register(%d)\n", ret);
> --
> 1.7.9.5
>
>
>



-- 
Bryan Wu <bryan.wu@...onical.com>
Kernel Developer    +86.186-168-78255 Mobile
Canonical Ltd.      www.canonical.com
Ubuntu - Linux for human beings | www.ubuntu.com
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