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pwm_backlight: add check_fb() hook

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In systems with multiple framebuffer devices, one of the devices might be
blanked while another is unblanked.  In order for the backlight blanking
logic to know whether to turn off the backlight for a particular
framebuffer's blanking notification, it needs to be able to check if a
given framebuffer device corresponds to the backlight.

This plumbs the check_fb hook from core backlight through the
pwm_backlight helper to allow platform code to plug in a check_fb hook.

Signed-off-by: Robert Morell <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Arun Murthy <[email protected]>
Cc: Linus Walleij <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Robert Morell 2011-03-22 16:30:31 -07:00 • committed by Linus Torvalds
commit ef0a5e80f5
2 changed files with 14 additions and 0 deletions
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11
drivers/video/backlight/pwm_bl.c
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@ -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;