* [PATCH v3] leds: gpio: Set max brightness to 1
@ 2021-01-25 20:08 Dylan Van Assche
2021-02-18 13:23 ` Pavel Machek
0 siblings, 1 reply; 3+ messages in thread
From: Dylan Van Assche @ 2021-01-25 20:08 UTC (permalink / raw)
To: pavel, dmurphy, linux-leds, linux-kernel; +Cc: Dylan Van Assche
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@dylanvanassche.be>
---
v2 drops an obsolete change in include/linux/leds.h
v3 simplifies the patch for better readability
drivers/leds/leds-gpio.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 93f5b1b60fde..242bb38cadee 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -96,7 +96,9 @@ 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)
--
2.30.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v3] leds: gpio: Set max brightness to 1
2021-01-25 20:08 [PATCH v3] leds: gpio: Set max brightness to 1 Dylan Van Assche
@ 2021-02-18 13:23 ` Pavel Machek
0 siblings, 0 replies; 3+ messages in thread
From: Pavel Machek @ 2021-02-18 13:23 UTC (permalink / raw)
To: Dylan Van Assche; +Cc: dmurphy, linux-leds, linux-kernel
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On Mon 2021-01-25 21:08:57, Dylan Van Assche wrote:
> 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@dylanvanassche.be>
I believe I have applied this already.
Thanks for patches,
Pavel
--
http://www.livejournal.com/~pavelmachek
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v3] leds: gpio: Set max brightness to 1
@ 2020-12-29 18:15 Dylan Van Assche
0 siblings, 0 replies; 3+ messages in thread
From: Dylan Van Assche @ 2020-12-29 18:15 UTC (permalink / raw)
To: pavel, dmurphy, linux-leds, linux-kernel; +Cc: Dylan Van Assche
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@dylanvanassche.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
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-02-18 16:57 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-01-25 20:08 [PATCH v3] leds: gpio: Set max brightness to 1 Dylan Van Assche
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2020-12-29 18:15 Dylan Van Assche
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