Linux kernel mirror (for testing)
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tjh.dev
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linux
1/*
2 * LP855x Backlight Driver
3 *
4 * Copyright (C) 2011 Texas Instruments
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#ifndef _LP855X_H
13#define _LP855X_H
14
15#define BL_CTL_SHFT (0)
16#define BRT_MODE_SHFT (1)
17#define BRT_MODE_MASK (0x06)
18
19/* Enable backlight. Only valid when BRT_MODE=10(I2C only) */
20#define ENABLE_BL (1)
21#define DISABLE_BL (0)
22
23#define I2C_CONFIG(id) id ## _I2C_CONFIG
24#define PWM_CONFIG(id) id ## _PWM_CONFIG
25
26/* DEVICE CONTROL register - LP8550 */
27#define LP8550_PWM_CONFIG (LP8550_PWM_ONLY << BRT_MODE_SHFT)
28#define LP8550_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
29 (LP8550_I2C_ONLY << BRT_MODE_SHFT))
30
31/* DEVICE CONTROL register - LP8551 */
32#define LP8551_PWM_CONFIG LP8550_PWM_CONFIG
33#define LP8551_I2C_CONFIG LP8550_I2C_CONFIG
34
35/* DEVICE CONTROL register - LP8552 */
36#define LP8552_PWM_CONFIG LP8550_PWM_CONFIG
37#define LP8552_I2C_CONFIG LP8550_I2C_CONFIG
38
39/* DEVICE CONTROL register - LP8553 */
40#define LP8553_PWM_CONFIG LP8550_PWM_CONFIG
41#define LP8553_I2C_CONFIG LP8550_I2C_CONFIG
42
43/* CONFIG register - LP8555 */
44#define LP8555_PWM_STANDBY BIT(7)
45#define LP8555_PWM_FILTER BIT(6)
46#define LP8555_RELOAD_EPROM BIT(3) /* use it if EPROMs should be reset
47 when the backlight turns on */
48#define LP8555_OFF_OPENLEDS BIT(2)
49#define LP8555_PWM_CONFIG LP8555_PWM_ONLY
50#define LP8555_I2C_CONFIG LP8555_I2C_ONLY
51#define LP8555_COMB1_CONFIG LP8555_COMBINED1
52#define LP8555_COMB2_CONFIG LP8555_COMBINED2
53
54/* DEVICE CONTROL register - LP8556 */
55#define LP8556_PWM_CONFIG (LP8556_PWM_ONLY << BRT_MODE_SHFT)
56#define LP8556_COMB1_CONFIG (LP8556_COMBINED1 << BRT_MODE_SHFT)
57#define LP8556_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
58 (LP8556_I2C_ONLY << BRT_MODE_SHFT))
59#define LP8556_COMB2_CONFIG (LP8556_COMBINED2 << BRT_MODE_SHFT)
60#define LP8556_FAST_CONFIG BIT(7) /* use it if EPROMs should be maintained
61 when exiting the low power mode */
62
63/* CONFIG register - LP8557 */
64#define LP8557_PWM_STANDBY BIT(7)
65#define LP8557_PWM_FILTER BIT(6)
66#define LP8557_RELOAD_EPROM BIT(3) /* use it if EPROMs should be reset
67 when the backlight turns on */
68#define LP8557_OFF_OPENLEDS BIT(2)
69#define LP8557_PWM_CONFIG LP8557_PWM_ONLY
70#define LP8557_I2C_CONFIG LP8557_I2C_ONLY
71#define LP8557_COMB1_CONFIG LP8557_COMBINED1
72#define LP8557_COMB2_CONFIG LP8557_COMBINED2
73
74enum lp855x_chip_id {
75 LP8550,
76 LP8551,
77 LP8552,
78 LP8553,
79 LP8555,
80 LP8556,
81 LP8557,
82};
83
84enum lp8550_brighntess_source {
85 LP8550_PWM_ONLY,
86 LP8550_I2C_ONLY = 2,
87};
88
89enum lp8551_brighntess_source {
90 LP8551_PWM_ONLY = LP8550_PWM_ONLY,
91 LP8551_I2C_ONLY = LP8550_I2C_ONLY,
92};
93
94enum lp8552_brighntess_source {
95 LP8552_PWM_ONLY = LP8550_PWM_ONLY,
96 LP8552_I2C_ONLY = LP8550_I2C_ONLY,
97};
98
99enum lp8553_brighntess_source {
100 LP8553_PWM_ONLY = LP8550_PWM_ONLY,
101 LP8553_I2C_ONLY = LP8550_I2C_ONLY,
102};
103
104enum lp8555_brightness_source {
105 LP8555_PWM_ONLY,
106 LP8555_I2C_ONLY,
107 LP8555_COMBINED1, /* Brightness register with shaped PWM */
108 LP8555_COMBINED2, /* PWM with shaped brightness register */
109};
110
111enum lp8556_brightness_source {
112 LP8556_PWM_ONLY,
113 LP8556_COMBINED1, /* pwm + i2c before the shaper block */
114 LP8556_I2C_ONLY,
115 LP8556_COMBINED2, /* pwm + i2c after the shaper block */
116};
117
118enum lp8557_brightness_source {
119 LP8557_PWM_ONLY,
120 LP8557_I2C_ONLY,
121 LP8557_COMBINED1, /* pwm + i2c after the shaper block */
122 LP8557_COMBINED2, /* pwm + i2c before the shaper block */
123};
124
125struct lp855x_rom_data {
126 u8 addr;
127 u8 val;
128};
129
130/**
131 * struct lp855x_platform_data
132 * @name : Backlight driver name. If it is not defined, default name is set.
133 * @device_control : value of DEVICE CONTROL register
134 * @initial_brightness : initial value of backlight brightness
135 * @period_ns : platform specific pwm period value. unit is nano.
136 Only valid when mode is PWM_BASED.
137 * @size_program : total size of lp855x_rom_data
138 * @rom_data : list of new eeprom/eprom registers
139 */
140struct lp855x_platform_data {
141 const char *name;
142 u8 device_control;
143 u8 initial_brightness;
144 unsigned int period_ns;
145 int size_program;
146 struct lp855x_rom_data *rom_data;
147};
148
149#endif