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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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