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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a55944ca82
We don't have to update the state and fb_blank properties of a backlight device every time a blanking or unblanking event comes because they may have already been what we want. Another thought is that one backlight device may be shared by multiple framebuffers. The backlight driver should take the backlight device as a resource shared by all the associated framebuffers. This patch adds some logic to record each framebuffer's backlight usage to determine the backlight device use count and whether the two properties should be updated or not. To be more specific, only one unblank operation on a certain blanked framebuffer may increase the backlight device's use count by one, while one blank operation on a certain unblanked framebuffer may decrease the use count by one, because the userspace is likely to unblank an unblanked framebuffer or blank a blanked framebuffer. Signed-off-by: Liu Ying <Ying.Liu@freescale.com> Cc: Jingoo Han <jg1.han@samsung.com> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
164 lines
4.9 KiB
C
164 lines
4.9 KiB
C
/*
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* Backlight Lowlevel Control Abstraction
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*
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* Copyright (C) 2003,2004 Hewlett-Packard Company
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*
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*/
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#ifndef _LINUX_BACKLIGHT_H
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#define _LINUX_BACKLIGHT_H
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#include <linux/device.h>
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#include <linux/fb.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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/* Notes on locking:
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*
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* backlight_device->ops_lock is an internal backlight lock protecting the
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* ops pointer and no code outside the core should need to touch it.
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*
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* Access to update_status() is serialised by the update_lock mutex since
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* most drivers seem to need this and historically get it wrong.
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*
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* Most drivers don't need locking on their get_brightness() method.
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* If yours does, you need to implement it in the driver. You can use the
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* update_lock mutex if appropriate.
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*
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* Any other use of the locks below is probably wrong.
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*/
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enum backlight_update_reason {
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BACKLIGHT_UPDATE_HOTKEY,
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BACKLIGHT_UPDATE_SYSFS,
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};
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enum backlight_type {
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BACKLIGHT_RAW = 1,
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BACKLIGHT_PLATFORM,
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BACKLIGHT_FIRMWARE,
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BACKLIGHT_TYPE_MAX,
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};
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struct backlight_device;
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struct fb_info;
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struct backlight_ops {
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unsigned int options;
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#define BL_CORE_SUSPENDRESUME (1 << 0)
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/* Notify the backlight driver some property has changed */
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int (*update_status)(struct backlight_device *);
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/* Return the current backlight brightness (accounting for power,
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fb_blank etc.) */
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int (*get_brightness)(struct backlight_device *);
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/* Check if given framebuffer device is the one bound to this backlight;
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return 0 if not, !=0 if it is. If NULL, backlight always matches the fb. */
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int (*check_fb)(struct backlight_device *, struct fb_info *);
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};
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/* This structure defines all the properties of a backlight */
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struct backlight_properties {
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/* Current User requested brightness (0 - max_brightness) */
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int brightness;
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/* Maximal value for brightness (read-only) */
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int max_brightness;
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/* Current FB Power mode (0: full on, 1..3: power saving
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modes; 4: full off), see FB_BLANK_XXX */
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int power;
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/* FB Blanking active? (values as for power) */
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/* Due to be removed, please use (state & BL_CORE_FBBLANK) */
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int fb_blank;
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/* Backlight type */
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enum backlight_type type;
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/* Flags used to signal drivers of state changes */
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/* Upper 4 bits are reserved for driver internal use */
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unsigned int state;
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#define BL_CORE_SUSPENDED (1 << 0) /* backlight is suspended */
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#define BL_CORE_FBBLANK (1 << 1) /* backlight is under an fb blank event */
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#define BL_CORE_DRIVER4 (1 << 28) /* reserved for driver specific use */
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#define BL_CORE_DRIVER3 (1 << 29) /* reserved for driver specific use */
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#define BL_CORE_DRIVER2 (1 << 30) /* reserved for driver specific use */
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#define BL_CORE_DRIVER1 (1 << 31) /* reserved for driver specific use */
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};
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struct backlight_device {
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/* Backlight properties */
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struct backlight_properties props;
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/* Serialise access to update_status method */
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struct mutex update_lock;
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/* This protects the 'ops' field. If 'ops' is NULL, the driver that
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registered this device has been unloaded, and if class_get_devdata()
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points to something in the body of that driver, it is also invalid. */
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struct mutex ops_lock;
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const struct backlight_ops *ops;
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/* The framebuffer notifier block */
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struct notifier_block fb_notif;
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/* list entry of all registered backlight devices */
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struct list_head entry;
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struct device dev;
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/* Multiple framebuffers may share one backlight device */
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bool fb_bl_on[FB_MAX];
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int use_count;
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};
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static inline void backlight_update_status(struct backlight_device *bd)
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{
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mutex_lock(&bd->update_lock);
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if (bd->ops && bd->ops->update_status)
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bd->ops->update_status(bd);
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mutex_unlock(&bd->update_lock);
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}
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extern struct backlight_device *backlight_device_register(const char *name,
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struct device *dev, void *devdata, const struct backlight_ops *ops,
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const struct backlight_properties *props);
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extern struct backlight_device *devm_backlight_device_register(
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struct device *dev, const char *name, struct device *parent,
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void *devdata, const struct backlight_ops *ops,
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const struct backlight_properties *props);
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extern void backlight_device_unregister(struct backlight_device *bd);
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extern void devm_backlight_device_unregister(struct device *dev,
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struct backlight_device *bd);
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extern void backlight_force_update(struct backlight_device *bd,
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enum backlight_update_reason reason);
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extern bool backlight_device_registered(enum backlight_type type);
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#define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
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static inline void * bl_get_data(struct backlight_device *bl_dev)
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{
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return dev_get_drvdata(&bl_dev->dev);
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}
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struct generic_bl_info {
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const char *name;
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int max_intensity;
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int default_intensity;
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int limit_mask;
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void (*set_bl_intensity)(int intensity);
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void (*kick_battery)(void);
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};
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#ifdef CONFIG_OF
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struct backlight_device *of_find_backlight_by_node(struct device_node *node);
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#else
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static inline struct backlight_device *
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of_find_backlight_by_node(struct device_node *node)
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{
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return NULL;
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}
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#endif
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#endif
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