linux-kernel - [PATCH v3] leds: gpio: Set max brightness to 1

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Date:   Tue, 29 Dec 2020 19:15:12 +0100
From:   Dylan Van Assche <me@...anvanassche.be>
To:     pavel@....cz, dmurphy@...com, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dylan Van Assche <me@...anvanassche.be>
Subject: [PATCH v3] leds: gpio: Set max brightness to 1

GPIO LEDs only know 2 states: ON or OFF and do not have PWM capabilities.
However, the max brightness is reported as 255.

This patch sets the max brightness value of a GPIO controlled LED to 1.

Tested on my PinePhone 1.2.

Signed-off-by: Dylan Van Assche <me@...anvanassche.be>
---
Changelog                                          
  - v2 drops an obsolete change in include/linux/leds.h
  - v3 simplifies the patch and makes it more readable

 drivers/leds/leds-gpio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 93f5b1b60fde..b5d5e22d2d1e 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -96,7 +96,8 @@ static int create_gpio_led(const struct gpio_led *template,
 	} else {
 		state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
 	}
-	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
+	led_dat->cdev.brightness = state;
+	led_dat->cdev.max_brightness = 1;
 	if (!template->retain_state_suspended)
 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
 	if (template->panic_indicator)
-- 
2.26.2