linux-kernel - [PATCH 09/20] leds: mark gpio driver with LED_BRIGHTNESS

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Date:	Thu, 21 May 2015 18:16:53 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	linux-leds@...r.kernel.org
CC:	Linux kernel <linux-kernel@...r.kernel.org>,
	Stas Sergeev <stsp@...rs.sourceforge.net>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Raphael Assenat <raph@...com>
Subject: [PATCH 09/20] leds: mark gpio driver with LED_BRIGHTNESS_FAST flag


This driver doesn't use sleeping operations in .brightness_set
method if can_sleep variable is not set. In that case it can be
marked with LED_BRIGHTNESS_FAST flag.
That flag allows changing brightness at high rates (over 100Hz).

CC: Bryan Wu <cooloney@...il.com>
CC: Richard Purdie <rpurdie@...ys.net>
CC: Jacek Anaszewski <j.anaszewski@...sung.com>
CC: linux-leds@...r.kernel.org
CC: linux-kernel@...r.kernel.org
CC: Raphael Assenat <raph@...com>

Signed-off-by: Stas Sergeev <stsp@...rs.sourceforge.net>
---
 drivers/leds/leds-gpio.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 3af4f2b..0e1346c 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -138,6 +138,8 @@ static int create_gpio_led(const struct gpio_led *template,
 	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
 	if (!template->retain_state_suspended)
 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	if (!led_dat->can_sleep)
+		led_dat->cdev.flags |= LED_BRIGHTNESS_FAST;

 	ret = gpiod_direction_output(led_dat->gpiod, state);
 	if (ret < 0)
-- 
1.7.9.5
--
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