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TOMOYO Linux Cross Reference
Linux/include/linux/lcd.h

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  1 /*
  2  * LCD Lowlevel Control Abstraction
  3  *
  4  * Copyright (C) 2003,2004 Hewlett-Packard Company
  5  *
  6  */
  7 
  8 #ifndef _LINUX_LCD_H
  9 #define _LINUX_LCD_H
 10 
 11 #include <linux/device.h>
 12 #include <linux/mutex.h>
 13 #include <linux/notifier.h>
 14 #include <linux/fb.h>
 15 
 16 /* Notes on locking:
 17  *
 18  * lcd_device->ops_lock is an internal backlight lock protecting the ops
 19  * field and no code outside the core should need to touch it.
 20  *
 21  * Access to set_power() is serialised by the update_lock mutex since
 22  * most drivers seem to need this and historically get it wrong.
 23  *
 24  * Most drivers don't need locking on their get_power() method.
 25  * If yours does, you need to implement it in the driver. You can use the
 26  * update_lock mutex if appropriate.
 27  *
 28  * Any other use of the locks below is probably wrong.
 29  */
 30 
 31 struct lcd_device;
 32 struct fb_info;
 33 
 34 struct lcd_properties {
 35         /* The maximum value for contrast (read-only) */
 36         int max_contrast;
 37 };
 38 
 39 struct lcd_ops {
 40         /* Get the LCD panel power status (0: full on, 1..3: controller
 41            power on, flat panel power off, 4: full off), see FB_BLANK_XXX */
 42         int (*get_power)(struct lcd_device *);
 43         /*
 44          * Enable or disable power to the LCD(0: on; 4: off, see FB_BLANK_XXX)
 45          * and this callback would be called proir to fb driver's callback.
 46          *
 47          * P.S. note that if early_set_power is not NULL then early fb notifier
 48          *      would be registered.
 49          */
 50         int (*early_set_power)(struct lcd_device *, int power);
 51         /* revert the effects of the early blank event. */
 52         int (*r_early_set_power)(struct lcd_device *, int power);
 53         /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */
 54         int (*set_power)(struct lcd_device *, int power);
 55         /* Get the current contrast setting (0-max_contrast) */
 56         int (*get_contrast)(struct lcd_device *);
 57         /* Set LCD panel contrast */
 58         int (*set_contrast)(struct lcd_device *, int contrast);
 59         /* Set LCD panel mode (resolutions ...) */
 60         int (*set_mode)(struct lcd_device *, struct fb_videomode *);
 61         /* Check if given framebuffer device is the one LCD is bound to;
 62            return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */
 63         int (*check_fb)(struct lcd_device *, struct fb_info *);
 64 };
 65 
 66 struct lcd_device {
 67         struct lcd_properties props;
 68         /* This protects the 'ops' field. If 'ops' is NULL, the driver that
 69            registered this device has been unloaded, and if class_get_devdata()
 70            points to something in the body of that driver, it is also invalid. */
 71         struct mutex ops_lock;
 72         /* If this is NULL, the backing module is unloaded */
 73         struct lcd_ops *ops;
 74         /* Serialise access to set_power method */
 75         struct mutex update_lock;
 76         /* The framebuffer notifier block */
 77         struct notifier_block fb_notif;
 78 
 79         struct device dev;
 80 };
 81 
 82 struct lcd_platform_data {
 83         /* reset lcd panel device. */
 84         int (*reset)(struct lcd_device *ld);
 85         /* on or off to lcd panel. if 'enable' is 0 then
 86            lcd power off and 1, lcd power on. */
 87         int (*power_on)(struct lcd_device *ld, int enable);
 88 
 89         /* it indicates whether lcd panel was enabled
 90            from bootloader or not. */
 91         int lcd_enabled;
 92         /* it means delay for stable time when it becomes low to high
 93            or high to low that is dependent on whether reset gpio is
 94            low active or high active. */
 95         unsigned int reset_delay;
 96         /* stable time needing to become lcd power on. */
 97         unsigned int power_on_delay;
 98         /* stable time needing to become lcd power off. */
 99         unsigned int power_off_delay;
100 
101         /* it could be used for any purpose. */
102         void *pdata;
103 };
104 
105 static inline void lcd_set_power(struct lcd_device *ld, int power)
106 {
107         mutex_lock(&ld->update_lock);
108         if (ld->ops && ld->ops->set_power)
109                 ld->ops->set_power(ld, power);
110         mutex_unlock(&ld->update_lock);
111 }
112 
113 extern struct lcd_device *lcd_device_register(const char *name,
114         struct device *parent, void *devdata, struct lcd_ops *ops);
115 extern struct lcd_device *devm_lcd_device_register(struct device *dev,
116         const char *name, struct device *parent,
117         void *devdata, struct lcd_ops *ops);
118 extern void lcd_device_unregister(struct lcd_device *ld);
119 extern void devm_lcd_device_unregister(struct device *dev,
120         struct lcd_device *ld);
121 
122 #define to_lcd_device(obj) container_of(obj, struct lcd_device, dev)
123 
124 static inline void * lcd_get_data(struct lcd_device *ld_dev)
125 {
126         return dev_get_drvdata(&ld_dev->dev);
127 }
128 
129 
130 #endif
131 

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