linux-kernel - Re: [PATCH] fujitsu-laptop: Rework brightness of eco led

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Date:	Mon, 4 Jul 2016 20:59:14 +0930
From:	Jonathan Woithe <jwoithe@...t42.net>
To:	Matej Groma <matejgroma@...il.com>
Cc:	dvhart@...radead.org, platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fujitsu-laptop: Rework brightness of eco led

On Mon, Jul 04, 2016 at 12:04:12PM +0200, Matej Groma wrote:
> For the sake of internal consistency, unset maximum brightness of eco
> led and make it activatable only on values >= LED_FULL.
> 
> Signed-off-by: Matej Groma <matejgroma@...il.com>

Acked-by: Jonathan Woithe <jwoithe@...t42.net>

> ---
> Here is a small statistics covering max brightness of platform-x86 leds:
> 1	other	unset
> 8	6	7
> 3/7 leds that have unset max_brightness are activated on nonzero value.
> The other 4 are fujitsu-laptop leds. Maybe someone from led subsystem
> would be willing to look at this and standardise guidelines on how and
> when to use different brightness levels. Hopefully, this could then be
> reverted.
> 
>  drivers/platform/x86/fujitsu-laptop.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> index 6ce8e78..61f39ab 100644
> --- a/drivers/platform/x86/fujitsu-laptop.c
> +++ b/drivers/platform/x86/fujitsu-laptop.c
> @@ -212,7 +212,6 @@ static void eco_led_set(struct led_classdev *cdev,
> 
>  static struct led_classdev eco_led = {
>   .name = "fujitsu::eco_led",
> - .max_brightness = 1,
>   .brightness_get = eco_led_get,
>   .brightness_set = eco_led_set
>  };
> @@ -306,7 +305,7 @@ static void eco_led_set(struct led_classdev *cdev,
>  	int curr;
> 
>  	curr = call_fext_func(FUNC_LEDS, 0x2, ECO_LED, 0x0);
> -	if (brightness)
> +	if (brightness >= LED_FULL)
>  		call_fext_func(FUNC_LEDS, 0x1, ECO_LED, curr | ECO_LED_ON);
>  	else
>  		call_fext_func(FUNC_LEDS, 0x1, ECO_LED, curr & ~ECO_LED_ON);
> @@ -352,7 +351,7 @@ static enum led_brightness eco_led_get(struct led_classdev *cdev)
>  	enum led_brightness brightness = LED_OFF;
> 
>  	if (call_fext_func(FUNC_LEDS, 0x2, ECO_LED, 0x0) & ECO_LED_ON)
> -		brightness = cdev->max_brightness;
> +		brightness = LED_FULL;
> 
>  	return brightness;
>  }