From d24e10c10e57875a65451f46025623f0f77cefbe Mon Sep 17 00:00:00 2001
From: Gregoire Gentil <gregoire@gentil.com>
Date: Wed, 31 Mar 2010 11:14:04 +0200
Subject: [PATCH 15/16] 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