From cc8cb0d0731c7a0517653e65c754051a69f34c3e Mon Sep 17 00:00:00 2001
From: Gregoire Gentil <gregoire@gentil.com>
Date: Wed, 31 Mar 2010 11:14:04 +0200
Subject: [PATCH 14/17] backlight: add PWM support
---
drivers/video/backlight/backlight.c | 81 +++++++++++++++++++++++++++++++++++
include/linux/backlight.h | 3 +
2 files changed, 84 insertions(+), 0 deletions(-)
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 7898707..615f40f 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -226,6 +226,84 @@ static void bl_device_release(struct device *dev)
kfree(bd);
}
+static ssize_t backlight_show_boost(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+ return sprintf(buf, "%u\n", bd->props.boost);
+}
+
+static ssize_t backlight_store_boost(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ unsigned long i;
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ if (strict_strtoul(buf, 10, &i))
+ return -EINVAL;
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops)
+ {
+ if (i)
+ bd->props.boost = 1;
+ else
+ bd->props.boost = 0;
+ backlight_update_status(bd);
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ return count;
+}
+
+static ssize_t backlight_show_pwm_fq(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+ return sprintf(buf, "%u\n", bd->props.pwm_fq);
+}
+
+static ssize_t backlight_store_pwm_fq(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ unsigned long i;
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ if (strict_strtoul(buf, 10, &i))
+ return -EINVAL;
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops)
+ {
+ bd->props.pwm_fq = i;
+ backlight_update_status(bd);
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ return count;
+}
+
+static ssize_t backlight_show_min_duty(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct backlight_device *bd = to_backlight_device(dev);
+ return sprintf(buf, "%u\n", bd->props.min_duty);
+}
+
+static ssize_t backlight_store_min_duty(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+ unsigned long i;
+ struct backlight_device *bd = to_backlight_device(dev);
+
+ if (strict_strtoul(buf, 10, &i))
+ return -EINVAL;
+
+ mutex_lock(&bd->ops_lock);
+ if (bd->ops)
+ {
+ bd->props.min_duty = i;
+ backlight_update_status(bd);
+ }
+ mutex_unlock(&bd->ops_lock);
+
+ return count;
+}
+
static struct device_attribute bl_device_attributes[] = {
__ATTR(bl_power, 0644, backlight_show_power, backlight_store_power),
__ATTR(brightness, 0666, backlight_show_brightness,
@@ -233,6 +311,9 @@ static struct device_attribute bl_device_attributes[] = {
__ATTR(actual_brightness, 0444, backlight_show_actual_brightness,
NULL),
__ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL),
+ __ATTR(boost, 0666, backlight_show_boost, backlight_store_boost),
+ __ATTR(pwm_fq, 0666, backlight_show_pwm_fq, backlight_store_pwm_fq),
+ __ATTR(min_duty, 0666, backlight_show_min_duty, backlight_store_min_duty),
__ATTR_NULL,
};
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 0f5f578..f3a9b9f 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -64,6 +64,9 @@ struct backlight_properties {
int fb_blank;
/* Flags used to signal drivers of state changes */
/* Upper 4 bits are reserved for driver internal use */
+ int boost;
+ int pwm_fq;
+ int min_duty;
unsigned int state;
#define BL_CORE_SUSPENDED (1 << 0) /* backlight is suspended */
--
1.6.6.1