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121 lines
3.8 KiB
121 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* LCD 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_LCD_H |
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#define _LINUX_LCD_H |
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#include <linux/device.h> |
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#include <linux/mutex.h> |
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#include <linux/notifier.h> |
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#include <linux/fb.h> |
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/* Notes on locking: |
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* |
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* lcd_device->ops_lock is an internal backlight lock protecting the ops |
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* field and no code outside the core should need to touch it. |
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* |
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* Access to set_power() 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_power() 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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struct lcd_device; |
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struct fb_info; |
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struct lcd_properties { |
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/* The maximum value for contrast (read-only) */ |
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int max_contrast; |
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}; |
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struct lcd_ops { |
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/* Get the LCD panel power status (0: full on, 1..3: controller |
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power on, flat panel power off, 4: full off), see FB_BLANK_XXX */ |
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int (*get_power)(struct lcd_device *); |
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/* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */ |
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int (*set_power)(struct lcd_device *, int power); |
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/* Get the current contrast setting (0-max_contrast) */ |
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int (*get_contrast)(struct lcd_device *); |
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/* Set LCD panel contrast */ |
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int (*set_contrast)(struct lcd_device *, int contrast); |
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/* Set LCD panel mode (resolutions ...) */ |
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int (*set_mode)(struct lcd_device *, struct fb_videomode *); |
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/* Check if given framebuffer device is the one LCD is bound to; |
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return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */ |
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int (*check_fb)(struct lcd_device *, struct fb_info *); |
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}; |
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struct lcd_device { |
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struct lcd_properties props; |
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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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/* If this is NULL, the backing module is unloaded */ |
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struct lcd_ops *ops; |
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/* Serialise access to set_power method */ |
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struct mutex update_lock; |
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/* The framebuffer notifier block */ |
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struct notifier_block fb_notif; |
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struct device dev; |
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}; |
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struct lcd_platform_data { |
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/* reset lcd panel device. */ |
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int (*reset)(struct lcd_device *ld); |
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/* on or off to lcd panel. if 'enable' is 0 then |
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lcd power off and 1, lcd power on. */ |
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int (*power_on)(struct lcd_device *ld, int enable); |
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/* it indicates whether lcd panel was enabled |
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from bootloader or not. */ |
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int lcd_enabled; |
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/* it means delay for stable time when it becomes low to high |
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or high to low that is dependent on whether reset gpio is |
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low active or high active. */ |
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unsigned int reset_delay; |
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/* stable time needing to become lcd power on. */ |
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unsigned int power_on_delay; |
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/* stable time needing to become lcd power off. */ |
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unsigned int power_off_delay; |
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/* it could be used for any purpose. */ |
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void *pdata; |
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}; |
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static inline void lcd_set_power(struct lcd_device *ld, int power) |
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{ |
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mutex_lock(&ld->update_lock); |
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if (ld->ops && ld->ops->set_power) |
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ld->ops->set_power(ld, power); |
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mutex_unlock(&ld->update_lock); |
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} |
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extern struct lcd_device *lcd_device_register(const char *name, |
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struct device *parent, void *devdata, struct lcd_ops *ops); |
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extern struct lcd_device *devm_lcd_device_register(struct device *dev, |
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const char *name, struct device *parent, |
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void *devdata, struct lcd_ops *ops); |
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extern void lcd_device_unregister(struct lcd_device *ld); |
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extern void devm_lcd_device_unregister(struct device *dev, |
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struct lcd_device *ld); |
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#define to_lcd_device(obj) container_of(obj, struct lcd_device, dev) |
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static inline void * lcd_get_data(struct lcd_device *ld_dev) |
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{ |
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return dev_get_drvdata(&ld_dev->dev); |
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} |
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#endif
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