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-rw-r--r--drivers/video/backlight/pwm_bl.c11
-rw-r--r--include/linux/pwm_backlight.h3
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 2c2a2c703c1..b8f38ec6eb1 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -28,6 +28,7 @@ struct pwm_bl_data {
unsigned int lth_brightness;
int (*notify)(struct device *,
int brightness);
+ int (*check_fb)(struct device *, struct fb_info *);
};
static int pwm_backlight_update_status(struct backlight_device *bl)
@@ -62,9 +63,18 @@ static int pwm_backlight_get_brightness(struct backlight_device *bl)
return bl->props.brightness;
}
+static int pwm_backlight_check_fb(struct backlight_device *bl,
+ struct fb_info *info)
+{
+ struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
+
+ return !pb->check_fb || pb->check_fb(pb->dev, info);
+}
+
static const struct backlight_ops pwm_backlight_ops = {
.update_status = pwm_backlight_update_status,
.get_brightness = pwm_backlight_get_brightness,
+ .check_fb = pwm_backlight_check_fb,
};
static int pwm_backlight_probe(struct platform_device *pdev)
@@ -95,6 +105,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->period = data->pwm_period_ns;
pb->notify = data->notify;
+ pb->check_fb = data->check_fb;
pb->lth_brightness = data->lth_brightness *
(data->pwm_period_ns / data->max_brightness);
pb->dev = &pdev->dev;
diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h
index e031e1a486d..5e3e25a3c9c 100644
--- a/include/linux/pwm_backlight.h
+++ b/include/linux/pwm_backlight.h
@@ -4,6 +4,8 @@
#ifndef __LINUX_PWM_BACKLIGHT_H
#define __LINUX_PWM_BACKLIGHT_H
+#include <linux/backlight.h>
+
struct platform_pwm_backlight_data {
int pwm_id;
unsigned int max_brightness;
@@ -13,6 +15,7 @@ struct platform_pwm_backlight_data {
int (*init)(struct device *dev);
int (*notify)(struct device *dev, int brightness);
void (*exit)(struct device *dev);
+ int (*check_fb)(struct device *dev, struct fb_info *info);
};
#endif