Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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/* DEVICE CONTROL register - LP8556 */
44#define LP8556_PWM_CONFIG (LP8556_PWM_ONLY << BRT_MODE_SHFT)
45#define LP8556_COMB1_CONFIG (LP8556_COMBINED1 << BRT_MODE_SHFT)
46#define LP8556_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
47 (LP8556_I2C_ONLY << BRT_MODE_SHFT))
48#define LP8556_COMB2_CONFIG (LP8556_COMBINED2 << BRT_MODE_SHFT)
49
50/* ROM area boundary */
51#define EEPROM_START (0xA0)
52#define EEPROM_END (0xA7)
53#define EPROM_START (0xA0)
54#define EPROM_END (0xAF)
55
56enum lp855x_chip_id {
57 LP8550,
58 LP8551,
59 LP8552,
60 LP8553,
61 LP8556,
62};
63
64enum lp855x_brightness_ctrl_mode {
65 PWM_BASED = 1,
66 REGISTER_BASED,
67};
68
69enum lp8550_brighntess_source {
70 LP8550_PWM_ONLY,
71 LP8550_I2C_ONLY = 2,
72};
73
74enum lp8551_brighntess_source {
75 LP8551_PWM_ONLY = LP8550_PWM_ONLY,
76 LP8551_I2C_ONLY = LP8550_I2C_ONLY,
77};
78
79enum lp8552_brighntess_source {
80 LP8552_PWM_ONLY = LP8550_PWM_ONLY,
81 LP8552_I2C_ONLY = LP8550_I2C_ONLY,
82};
83
84enum lp8553_brighntess_source {
85 LP8553_PWM_ONLY = LP8550_PWM_ONLY,
86 LP8553_I2C_ONLY = LP8550_I2C_ONLY,
87};
88
89enum lp8556_brightness_source {
90 LP8556_PWM_ONLY,
91 LP8556_COMBINED1, /* pwm + i2c before the shaper block */
92 LP8556_I2C_ONLY,
93 LP8556_COMBINED2, /* pwm + i2c after the shaper block */
94};
95
96struct lp855x_pwm_data {
97 void (*pwm_set_intensity) (int brightness, int max_brightness);
98 int (*pwm_get_intensity) (int max_brightness);
99};
100
101struct lp855x_rom_data {
102 u8 addr;
103 u8 val;
104};
105
106/**
107 * struct lp855x_platform_data
108 * @name : Backlight driver name. If it is not defined, default name is set.
109 * @mode : brightness control by pwm or lp855x register
110 * @device_control : value of DEVICE CONTROL register
111 * @initial_brightness : initial value of backlight brightness
112 * @pwm_data : platform specific pwm generation functions.
113 Only valid when mode is PWM_BASED.
114 * @load_new_rom_data :
115 0 : use default configuration data
116 1 : update values of eeprom or eprom registers on loading driver
117 * @size_program : total size of lp855x_rom_data
118 * @rom_data : list of new eeprom/eprom registers
119 */
120struct lp855x_platform_data {
121 char *name;
122 enum lp855x_brightness_ctrl_mode mode;
123 u8 device_control;
124 int initial_brightness;
125 struct lp855x_pwm_data pwm_data;
126 u8 load_new_rom_data;
127 int size_program;
128 struct lp855x_rom_data *rom_data;
129};
130
131#endif