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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152/* SPDX-License-Identifier: GPL-2.0 *//* * LCD Lowlevel Control Abstraction * * Copyright (C) 2003,2004 Hewlett-Packard Company * */
#ifndef _LINUX_LCD_H#define _LINUX_LCD_H
#include <linux/device.h>#include <linux/mutex.h>
#define LCD_POWER_ON (0)#define LCD_POWER_REDUCED (1) // deprecated; don't use in new code#define LCD_POWER_REDUCED_VSYNC_SUSPEND (2) // deprecated; don't use in new code#define LCD_POWER_OFF (4)
/* Notes on locking: * * lcd_device->ops_lock is an internal backlight lock protecting the ops * field and no code outside the core should need to touch it. * * Access to set_power() 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_power() 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 lcd_device;
struct lcd_properties { /* The maximum value for contrast (read-only) */ int max_contrast;};
struct lcd_ops { /* Get the LCD panel power status (0: full on, 1..3: controller power on, flat panel power off, 4: full off), see FB_BLANK_XXX */ int (*get_power)(struct lcd_device *); /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */ int (*set_power)(struct lcd_device *, int power); /* Get the current contrast setting (0-max_contrast) */ int (*get_contrast)(struct lcd_device *); /* Set LCD panel contrast */ int (*set_contrast)(struct lcd_device *, int contrast);
/* * Set LCD panel mode (resolutions ...) */ int (*set_mode)(struct lcd_device *lcd, u32 xres, u32 yres);
/* * Check if the LCD controls the given display device. This * operation is optional and if not implemented it is assumed that * the display is always the one controlled by the LCD. * * RETURNS: * * If display_dev is NULL or display_dev matches the device controlled by * the LCD, return true. Otherwise return false. */ bool (*controls_device)(struct lcd_device *lcd, struct device *display_device);};
struct lcd_device { struct lcd_properties props; /* 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; /* If this is NULL, the backing module is unloaded */ const struct lcd_ops *ops; /* Serialise access to set_power method */ struct mutex update_lock;
/** * @entry: List entry of all registered lcd devices */ struct list_head entry;
struct device dev;};
struct lcd_platform_data { /* reset lcd panel device. */ int (*reset)(struct lcd_device *ld); /* on or off to lcd panel. if 'enable' is 0 then lcd power off and 1, lcd power on. */ int (*power_on)(struct lcd_device *ld, int enable);
/* it indicates whether lcd panel was enabled from bootloader or not. */ int lcd_enabled; /* it means delay for stable time when it becomes low to high or high to low that is dependent on whether reset gpio is low active or high active. */ unsigned int reset_delay; /* stable time needing to become lcd power on. */ unsigned int power_on_delay; /* stable time needing to become lcd power off. */ unsigned int power_off_delay;
/* it could be used for any purpose. */ void *pdata;};
static inline void lcd_set_power(struct lcd_device *ld, int power){ mutex_lock(&ld->update_lock); if (ld->ops && ld->ops->set_power) ld->ops->set_power(ld, power); mutex_unlock(&ld->update_lock);}
extern struct lcd_device *lcd_device_register(const char *name, struct device *parent, void *devdata, const struct lcd_ops *ops);extern struct lcd_device *devm_lcd_device_register(struct device *dev, const char *name, struct device *parent, void *devdata, const struct lcd_ops *ops);extern void lcd_device_unregister(struct lcd_device *ld);extern void devm_lcd_device_unregister(struct device *dev, struct lcd_device *ld);
#if IS_REACHABLE(CONFIG_LCD_CLASS_DEVICE)void lcd_notify_blank_all(struct device *display_dev, int power);void lcd_notify_mode_change_all(struct device *display_dev, unsigned int width, unsigned int height);#elsestatic inline void lcd_notify_blank_all(struct device *display_dev, int power){}
static inline void lcd_notify_mode_change_all(struct device *display_dev, unsigned int width, unsigned int height){}#endif
#define to_lcd_device(obj) container_of(obj, struct lcd_device, dev)
static inline void * lcd_get_data(struct lcd_device *ld_dev){ return dev_get_drvdata(&ld_dev->dev);}
#endif