mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 23:40:53 +07:00
c3f8f65046
Convert the corgi backlight driver to a more generic version so it can be reused by other code rather than being Zaurus/PXA specific. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
|
|
* Backlight Lowlevel Control Abstraction
|
|
*
|
|
* Copyright (C) 2003,2004 Hewlett-Packard Company
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_BACKLIGHT_H
|
|
#define _LINUX_BACKLIGHT_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/notifier.h>
|
|
|
|
/* Notes on locking:
|
|
*
|
|
* backlight_device->ops_lock is an internal backlight lock protecting the
|
|
* ops pointer and no code outside the core should need to touch it.
|
|
*
|
|
* Access to update_status() is serialised by the update_lock mutex since
|
|
* most drivers seem to need this and historically get it wrong.
|
|
*
|
|
* Most drivers don't need locking on their get_brightness() method.
|
|
* If yours does, you need to implement it in the driver. You can use the
|
|
* update_lock mutex if appropriate.
|
|
*
|
|
* Any other use of the locks below is probably wrong.
|
|
*/
|
|
|
|
struct backlight_device;
|
|
struct fb_info;
|
|
|
|
struct backlight_ops {
|
|
/* Notify the backlight driver some property has changed */
|
|
int (*update_status)(struct backlight_device *);
|
|
/* Return the current backlight brightness (accounting for power,
|
|
fb_blank etc.) */
|
|
int (*get_brightness)(struct backlight_device *);
|
|
/* Check if given framebuffer device is the one bound to this backlight;
|
|
return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
|
|
int (*check_fb)(struct fb_info *);
|
|
};
|
|
|
|
/* This structure defines all the properties of a backlight */
|
|
struct backlight_properties {
|
|
/* Current User requested brightness (0 - max_brightness) */
|
|
int brightness;
|
|
/* Maximal value for brightness (read-only) */
|
|
int max_brightness;
|
|
/* Current FB Power mode (0: full on, 1..3: power saving
|
|
modes; 4: full off), see FB_BLANK_XXX */
|
|
int power;
|
|
/* FB Blanking active? (values as for power) */
|
|
int fb_blank;
|
|
};
|
|
|
|
struct backlight_device {
|
|
/* Backlight properties */
|
|
struct backlight_properties props;
|
|
|
|
/* Serialise access to update_status method */
|
|
struct mutex update_lock;
|
|
|
|
/* This protects the 'ops' field. If 'ops' is NULL, the driver that
|
|
registered this device has been unloaded, and if class_get_devdata()
|
|
points to something in the body of that driver, it is also invalid. */
|
|
struct mutex ops_lock;
|
|
struct backlight_ops *ops;
|
|
|
|
/* The framebuffer notifier block */
|
|
struct notifier_block fb_notif;
|
|
|
|
struct device dev;
|
|
};
|
|
|
|
static inline void backlight_update_status(struct backlight_device *bd)
|
|
{
|
|
mutex_lock(&bd->update_lock);
|
|
if (bd->ops && bd->ops->update_status)
|
|
bd->ops->update_status(bd);
|
|
mutex_unlock(&bd->update_lock);
|
|
}
|
|
|
|
extern struct backlight_device *backlight_device_register(const char *name,
|
|
struct device *dev, void *devdata, struct backlight_ops *ops);
|
|
extern void backlight_device_unregister(struct backlight_device *bd);
|
|
|
|
#define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
|
|
|
|
static inline void * bl_get_data(struct backlight_device *bl_dev)
|
|
{
|
|
return dev_get_drvdata(&bl_dev->dev);
|
|
}
|
|
|
|
struct generic_bl_info {
|
|
const char *name;
|
|
int max_intensity;
|
|
int default_intensity;
|
|
int limit_mask;
|
|
void (*set_bl_intensity)(int intensity);
|
|
void (*kick_battery)(void);
|
|
};
|
|
|
|
#endif
|