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backlight: add a callback 'notify_after' for backlight control 

We need a callback to do some things after pwm_enable, pwm_disable
and pwm_config.

Signed-off-by: Dilan Lee <dilee@nvidia.com>
Reviewed-by: Robert Morell <rmorell@nvidia.com>
Reviewed-by: Arun Murthy <arun.murthy@stericsson.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dilan Lee 2011-08-25 15:59:17 -07:00 committed by Linus Torvalds
parent 23751be009
commit cc7993f643
2 changed files with 10 additions and 0 deletions
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9
drivers/video/backlight/pwm_bl.c
View File

@ -28,6 +28,8 @@ struct pwm_bl_data {
unsigned int lth_brightness; unsigned int lth_brightness;
int (*notify)(struct device *, int (*notify)(struct device *,
int brightness); int brightness);
void (*notify_after)(struct device *,
int brightness);
int (*check_fb)(struct device *, struct fb_info *); int (*check_fb)(struct device *, struct fb_info *);
}; };
@ -55,6 +57,10 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
pwm_config(pb->pwm, brightness, pb->period); pwm_config(pb->pwm, brightness, pb->period);
pwm_enable(pb->pwm); pwm_enable(pb->pwm);
} }
if (pb->notify_after)
pb->notify_after(pb->dev, brightness);
return 0; return 0;
} }
@ -105,6 +111,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
pb->period = data->pwm_period_ns; pb->period = data->pwm_period_ns;
pb->notify = data->notify; pb->notify = data->notify;
pb->notify_after = data->notify_after;
pb->check_fb = data->check_fb; pb->check_fb = data->check_fb;
pb->lth_brightness = data->lth_brightness * pb->lth_brightness = data->lth_brightness *
(data->pwm_period_ns / data->max_brightness); (data->pwm_period_ns / data->max_brightness);
@ -172,6 +179,8 @@ static int pwm_backlight_suspend(struct platform_device *pdev,
pb->notify(pb->dev, 0); pb->notify(pb->dev, 0);
pwm_config(pb->pwm, 0, pb->period); pwm_config(pb->pwm, 0, pb->period);
pwm_disable(pb->pwm); pwm_disable(pb->pwm);
if (pb->notify_after)
pb->notify_after(pb->dev, 0);
return 0; return 0;
} }

1
include/linux/pwm_backlight.h
View File

@ -14,6 +14,7 @@ struct platform_pwm_backlight_data {
unsigned int pwm_period_ns; unsigned int pwm_period_ns;
int (*init)(struct device *dev); int (*init)(struct device *dev);
int (*notify)(struct device *dev, int brightness); int (*notify)(struct device *dev, int brightness);
void (*notify_after)(struct device *dev, int brightness);
void (*exit)(struct device *dev); void (*exit)(struct device *dev);
int (*check_fb)(struct device *dev, struct fb_info *info); int (*check_fb)(struct device *dev, struct fb_info *info);
}; };