linux-kernel - [PATCH 16/20] leds: mark pwm driver with LED_BRIGHTNESS

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Message-ID: <555DF80A.5050603@list.ru>
Date:	Thu, 21 May 2015 18:21:46 +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>,
	Luotao Fu <l.fu@...gutronix.de>
Subject: [PATCH 16/20] leds: mark pwm 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: Luotao Fu <l.fu@...gutronix.de>

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

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index 1d07e3e..82d01e5 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -124,6 +124,8 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 	led_data->can_sleep = pwm_can_sleep(led_data->pwm);
 	if (led_data->can_sleep)
 		INIT_WORK(&led_data->work, led_pwm_work);
+	else
+		led_data->cdev.flags |= LED_BRIGHTNESS_FAST;

 	led_data->period = pwm_get_period(led_data->pwm);
 	if (!led_data->period && (led->pwm_period_ns > 0))
-- 
1.7.9.5
--
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