diff mbox

video: Add a callback 'notify_after' for backlight control

Message ID 1312855525-21464-1-git-send-email-dilee@nvidia.com (mailing list archive)
State New, archived
Headers show

Commit Message

dilee@nvidia.com Aug. 9, 2011, 2:05 a.m. UTC 
From: Dilan Lee <dilee@nvidia.com>

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

This may be necessary to properly sequence timing on
certain devices.

For example, GPIO backlight_en has to be risen after pwm has been enabled
to meet panel power on sequence defined in panel specification.

Signed-off-by: Dilan Lee <dilee@nvidia.com>
---
 drivers/video/backlight/pwm_bl.c |   11 ++++++++++-
 include/linux/pwm_backlight.h    |    1 +
 2 files changed, 11 insertions(+), 1 deletions(-)

Comments

Robert Morell Aug. 9, 2011, 2:12 a.m. UTC | #1 
On Mon, Aug 08, 2011 at 07:05:25PM -0700, Dilan Lee wrote:
[...]
> For example, GPIO backlight_en has to be risen after pwm has been enabled
> to meet panel power on sequence defined in panel specification.

I still think this information is irrelevant/nonsensical here, and
should be omitted entirely..

[...]

>  	unsigned int		lth_brightness;
>  	int			(*notify)(struct device *,
> -					  int brightness);
> +					int brightness);

Please don't change the line above; unlike the one you added after, it
was already lined up properly with its argument list.

Otherwise,
Reviewed-by: Robert Morell <rmorell@nvidia.com>
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diff mbox

Patch

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index b8f38ec..e92e6e0 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -27,7 +27,9 @@  struct pwm_bl_data {
 	unsigned int		period;
 	unsigned int		lth_brightness;
 	int			(*notify)(struct device *,
-					  int brightness);
+					int brightness);
+	void			(*notify_after)(struct device *,
+					int brightness);
 	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_enable(pb->pwm);
 	}
+
+	if (pb->notify_after)
+		pb->notify_after(pb->dev, brightness);
+
 	return 0;
 }
 
@@ -105,6 +111,7 @@  static int pwm_backlight_probe(struct platform_device *pdev)
 
 	pb->period = data->pwm_period_ns;
 	pb->notify = data->notify;
+	pb->notify_after = data->notify_after;
 	pb->check_fb = data->check_fb;
 	pb->lth_brightness = data->lth_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);
 	pwm_config(pb->pwm, 0, pb->period);
 	pwm_disable(pb->pwm);
+	if (pb->notify_after)
+		pb->notify_after(pb->dev, 0);
 	return 0;
 }
 
diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h
index 5e3e25a..63d2df4 100644
--- a/include/linux/pwm_backlight.h
+++ b/include/linux/pwm_backlight.h
@@ -14,6 +14,7 @@  struct platform_pwm_backlight_data {
 	unsigned int pwm_period_ns;
 	int (*init)(struct device *dev);
 	int (*notify)(struct device *dev, int brightness);
+	void (*notify_after)(struct device *dev, int brightness);
 	void (*exit)(struct device *dev);
 	int (*check_fb)(struct device *dev, struct fb_info *info);
 };