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#define LP8556_FAST_CONFIG BIT(7) /* use it if EPROMs should be maintained
50 when exiting the low power mode */
51
52enum lp855x_chip_id {
53 LP8550,
54 LP8551,
55 LP8552,
56 LP8553,
57 LP8556,
58};
59
60enum lp855x_brightness_ctrl_mode {
61 PWM_BASED = 1,
62 REGISTER_BASED,
63};
64
65enum lp8550_brighntess_source {
66 LP8550_PWM_ONLY,
67 LP8550_I2C_ONLY = 2,
68};
69
70enum lp8551_brighntess_source {
71 LP8551_PWM_ONLY = LP8550_PWM_ONLY,
72 LP8551_I2C_ONLY = LP8550_I2C_ONLY,
73};
74
75enum lp8552_brighntess_source {
76 LP8552_PWM_ONLY = LP8550_PWM_ONLY,
77 LP8552_I2C_ONLY = LP8550_I2C_ONLY,
78};
79
80enum lp8553_brighntess_source {
81 LP8553_PWM_ONLY = LP8550_PWM_ONLY,
82 LP8553_I2C_ONLY = LP8550_I2C_ONLY,
83};
84
85enum lp8556_brightness_source {
86 LP8556_PWM_ONLY,
87 LP8556_COMBINED1, /* pwm + i2c before the shaper block */
88 LP8556_I2C_ONLY,
89 LP8556_COMBINED2, /* pwm + i2c after the shaper block */
90};
91
92struct lp855x_rom_data {
93 u8 addr;
94 u8 val;
95};
96
97/**
98 * struct lp855x_platform_data
99 * @name : Backlight driver name. If it is not defined, default name is set.
100 * @mode : brightness control by pwm or lp855x register
101 * @device_control : value of DEVICE CONTROL register
102 * @initial_brightness : initial value of backlight brightness
103 * @period_ns : platform specific pwm period value. unit is nano.
104 Only valid when mode is PWM_BASED.
105 * @load_new_rom_data :
106 0 : use default configuration data
107 1 : update values of eeprom or eprom registers on loading driver
108 * @size_program : total size of lp855x_rom_data
109 * @rom_data : list of new eeprom/eprom registers
110 */
111struct lp855x_platform_data {
112 char *name;
113 enum lp855x_brightness_ctrl_mode mode;
114 u8 device_control;
115 int initial_brightness;
116 unsigned int period_ns;
117 u8 load_new_rom_data;
118 int size_program;
119 struct lp855x_rom_data *rom_data;
120};
121
122#endif