Subject: [PATCH v6 5/5] leds: netxbig: set led_classdev max_brightness

From: [email-masked] (Jacek Anaszewski)
Date: Mon, 28 Sep 2015 10:02:35 +0200

Hi Simon,

Does your device support reading the brightness currently set?
If so, it would be good to implement brightness_get op, because
AFAIR you mentioned that the firmware you are working with sets
always maximum brightness value. Having the op implemented would
allow to find this out.

On 09/26/2015 11:02 PM, Simon Guinot wrote:
> This patch sets the led_classdev max_brightness to the maximum level
> value supported by hardware. This allows to get rid of the brightness
> conversion operation (from software [0:LED_FULL] to hardware ranges) in
> brightness_set().
>
> Signed-off-by: Simon Guinot <[email-masked]>
> ---
>   drivers/leds/leds-netxbig.c | 12 ++++--------
>   1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/leds/leds-netxbig.c b/drivers/leds/leds-netxbig.c
> index b166fd9f4186..4b88b93244be 100644
> --- a/drivers/leds/leds-netxbig.c
> +++ b/drivers/leds/leds-netxbig.c
> @@ -116,7 +116,6 @@ struct netxbig_led_data {
>   	int			mode_addr;
>   	int			*mode_val;
>   	int			bright_addr;
> -	int			bright_max;
>   	struct			netxbig_led_timer *timer;
>   	int			num_timer;
>   	enum netxbig_led_mode	mode;
> @@ -178,7 +177,7 @@ static void netxbig_led_set(struct led_classdev *led_cdev,
>   	struct netxbig_led_data *led_dat =
>   		container_of(led_cdev, struct netxbig_led_data, cdev);
>   	enum netxbig_led_mode mode;
> -	int mode_val, bright_val;
> +	int mode_val;
>   	int set_brightness = 1;
>   	unsigned long flags;
>
> @@ -204,12 +203,9 @@ static void netxbig_led_set(struct led_classdev *led_cdev,
>   	 * SATA LEDs. So, change the brightness setting for a single
>   	 * SATA LED will affect all the others.
>   	 */
> -	if (set_brightness) {
> -		bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
> -					  LED_FULL);
> +	if (set_brightness)
>   		gpio_ext_set_value(led_dat->gpio_ext,
> -				   led_dat->bright_addr, bright_val);
> -	}
> +				   led_dat->bright_addr, value);
>
>   	spin_unlock_irqrestore(&led_dat->lock, flags);
>   }
> @@ -306,11 +302,11 @@ static int create_netxbig_led(struct platform_device *pdev,
>   	 */
>   	led_dat->sata = 0;
>   	led_dat->cdev.brightness = LED_OFF;
> +	led_dat->cdev.max_brightness = template->bright_max;
>   	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
>   	led_dat->mode_addr = template->mode_addr;
>   	led_dat->mode_val = template->mode_val;
>   	led_dat->bright_addr = template->bright_addr;
> -	led_dat->bright_max = template->bright_max;
>   	led_dat->timer = pdata->timer;
>   	led_dat->num_timer = pdata->num_timer;
>   	/*
>

-- 
Best Regards,
Jacek Anaszewski