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panel: Expand the backlight support

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At present the panel can be turned on but not off, and the brightness
cannot be controlled at run-time. Add a new API function to both the panel
and backlight uclasses to handle this. Enhance the PWM backlight driver
to deal with custom levels properly and allow the backlight to be turned
on and off.

Update the test to cover thes new features.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2018-10-01 12:22:41 -06:00
parent 5d9a88f44a
commit a4f737a9c3
7 changed files with 276 additions and 39 deletions
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25
include/backlight.h
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@@ -7,6 +7,13 @@
#ifndef _BACKLIGHT_H
#define _BACKLIGHT_H
enum {
BACKLIGHT_MAX = 100,
BACKLIGHT_MIN = 0,
BACKLIGHT_OFF = -1,
BACKLIGHT_DEFAULT = -2,
};
struct backlight_ops {
/**
* enable() - Enable a backlight
@@ -15,6 +22,15 @@ struct backlight_ops {
* @return 0 if OK, -ve on error
*/
int (*enable)(struct udevice *dev);
/**
* set_brightness - Set brightness
*
* @dev: Backlight device to update
* @percent: Brightness value (0 to 100, or BACKLIGHT_... value)
* @return 0 if OK, -ve on error
*/
int (*set_brightness)(struct udevice *dev, int percent);
};
#define backlight_get_ops(dev) ((struct backlight_ops *)(dev)->driver->ops)
@@ -27,4 +43,13 @@ struct backlight_ops {
*/
int backlight_enable(struct udevice *dev);
/**
* backlight_set_brightness - Set brightness
*
* @dev: Backlight device to update
* @percent: Brightness value (0 to 100, or BACKLIGHT_... value)
* @return 0 if OK, -ve on error
*/
int backlight_set_brightness(struct udevice *dev, int percent);
#endif