linux-kernel - Re: [PATCH] leds: tlc591xx: update the maximum brightness

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Date:   Tue, 24 Sep 2019 21:26:25 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Jean-Jacques Hiblot <jjhiblot@...com>, pavel@....cz, dmurphy@...com
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH] leds: tlc591xx: update the maximum brightness

Hi Jean,

Thank you for the patch.

On 9/23/19 12:02 PM, Jean-Jacques Hiblot wrote:
> The TLC chips actually offer 257 levels:
> - 0: led OFF
> - 1-255: Led dimmed is using a PWM. The duty cycle range from 0.4% to 99.6%
> - 256: led fully ON
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
> ---
>  drivers/leds/leds-tlc591xx.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
> index 8eadb673dc2e..a8911ebd30e5 100644
> --- a/drivers/leds/leds-tlc591xx.c
> +++ b/drivers/leds/leds-tlc591xx.c
> @@ -13,6 +13,7 @@
>  #include <linux/slab.h>
>  
>  #define TLC591XX_MAX_LEDS	16
> +#define TLC591XX_MAX_BRIGHTNESS	256
>  
>  #define TLC591XX_REG_MODE1	0x00
>  #define MODE1_RESPON_ADDR_MASK	0xF0
> @@ -112,11 +113,11 @@ tlc591xx_brightness_set(struct led_classdev *led_cdev,
>  	struct tlc591xx_priv *priv = led->priv;
>  	int err;
>  
> -	switch (brightness) {
> +	switch ((int)brightness) {
>  	case 0:
>  		err = tlc591xx_set_ledout(priv, led, LEDOUT_OFF);
>  		break;
> -	case LED_FULL:
> +	case TLC591XX_MAX_BRIGHTNESS:
>  		err = tlc591xx_set_ledout(priv, led, LEDOUT_ON);
>  		break;
>  	default:
> @@ -209,7 +210,7 @@ tlc591xx_probe(struct i2c_client *client,
>  		led->priv = priv;
>  		led->led_no = reg;
>  		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
> -		led->ldev.max_brightness = LED_FULL;
> +		led->ldev.max_brightness = TLC591XX_MAX_BRIGHTNESS;
>  		err = devm_led_classdev_register_ext(dev, &led->ldev,
>  						     &init_data);
>  		if (err < 0) {
> 

Added tag:

Fixes: e370d010a5fe ("leds: tlc591xx: Driver for the TI 8/16 Channel i2c
LED driver")

and applied to the for-5.5 branch.

It is also a good habit to cc the author of the driver.

Cc Andrew.

-- 
Best regards,
Jacek Anaszewski