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/* SPDX-License-Identifier: GPL-2.0 */ /* * 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/fb.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. */ enum backlight_update_reason { BACKLIGHT_UPDATE_HOTKEY, BACKLIGHT_UPDATE_SYSFS, }; enum backlight_type { BACKLIGHT_RAW = 1, BACKLIGHT_PLATFORM, BACKLIGHT_FIRMWARE, BACKLIGHT_TYPE_MAX, }; enum backlight_notification { BACKLIGHT_REGISTERED, BACKLIGHT_UNREGISTERED, }; enum backlight_scale { BACKLIGHT_SCALE_UNKNOWN = 0, BACKLIGHT_SCALE_LINEAR, BACKLIGHT_SCALE_NON_LINEAR, }; struct backlight_device; struct fb_info; struct backlight_ops { unsigned int options; #define BL_CORE_SUSPENDRESUME (1 << 0) /* 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 backlight_device *, 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) */ /* Due to be removed, please use (state & BL_CORE_FBBLANK) */ int fb_blank; /* Backlight type */ enum backlight_type type; /* Flags used to signal drivers of state changes */ unsigned int state; /* Type of the brightness scale (linear, non-linear, ...) */ enum backlight_scale scale; #define BL_CORE_SUSPENDED (1 << 0) /* backlight is suspended */ #define BL_CORE_FBBLANK (1 << 1) /* backlight is under an fb blank event */ }; 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; const struct backlight_ops *ops; /* The framebuffer notifier block */ struct notifier_block fb_notif; /* list entry of all registered backlight devices */ struct list_head entry; struct device dev; /* Multiple framebuffers may share one backlight device */ bool fb_bl_on[FB_MAX]; int use_count; }; static inline int backlight_update_status(struct backlight_device *bd) { int ret = -ENOENT; mutex_lock(&bd->update_lock); if (bd->ops && bd->ops->update_status) ret = bd->ops->update_status(bd); mutex_unlock(&bd->update_lock); return ret; } /** * backlight_enable - Enable backlight * @bd: the backlight device to enable */ static inline int backlight_enable(struct backlight_device *bd) { if (!bd) return 0; bd->props.power = FB_BLANK_UNBLANK; bd->props.fb_blank = FB_BLANK_UNBLANK; bd->props.state &= ~BL_CORE_FBBLANK; return backlight_update_status(bd); } /** * backlight_disable - Disable backlight * @bd: the backlight device to disable */ static inline int backlight_disable(struct backlight_device *bd) { if (!bd) return 0; bd->props.power = FB_BLANK_POWERDOWN; bd->props.fb_blank = FB_BLANK_POWERDOWN; bd->props.state |= BL_CORE_FBBLANK; return backlight_update_status(bd); } /** * backlight_put - Drop backlight reference * @bd: the backlight device to put */ static inline void backlight_put(struct backlight_device *bd) { if (bd) put_device(&bd->dev); } extern struct backlight_device *backlight_device_register(const char *name, struct device *dev, void *devdata, const struct backlight_ops *ops, const struct backlight_properties *props); extern struct backlight_device *devm_backlight_device_register( struct device *dev, const char *name, struct device *parent, void *devdata, const struct backlight_ops *ops, const struct backlight_properties *props); extern void backlight_device_unregister(struct backlight_device *bd); extern void devm_backlight_device_unregister(struct device *dev, struct backlight_device *bd); extern void backlight_force_update(struct backlight_device *bd, enum backlight_update_reason reason); extern int backlight_register_notifier(struct notifier_block *nb); extern int backlight_unregister_notifier(struct notifier_block *nb); extern struct backlight_device *backlight_device_get_by_type(enum backlight_type type); extern int backlight_device_set_brightness(struct backlight_device *bd, unsigned long brightness); #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); }; #ifdef CONFIG_OF struct backlight_device *of_find_backlight_by_node(struct device_node *node); #else static inline struct backlight_device * of_find_backlight_by_node(struct device_node *node) { return NULL; } #endif #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) struct backlight_device *of_find_backlight(struct device *dev); struct backlight_device *devm_of_find_backlight(struct device *dev); #else static inline struct backlight_device *of_find_backlight(struct device *dev) { return NULL; } static inline struct backlight_device * devm_of_find_backlight(struct device *dev) { return NULL; } #endif #endif
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