include/linux/lp855x.h

   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
  56 enum lp855x_chip_id {
  57         LP8550,
  58         LP8551,
  59         LP8552,
  60         LP8553,
  61         LP8556,
  62 };
  63
  64 enum lp855x_brightness_ctrl_mode {
  65         PWM_BASED = 1,
  66         REGISTER_BASED,
  67 };
  68
  69 enum lp8550_brighntess_source {
  70         LP8550_PWM_ONLY,
  71         LP8550_I2C_ONLY = 2,
  72 };
  73
  74 enum lp8551_brighntess_source {
  75         LP8551_PWM_ONLY = LP8550_PWM_ONLY,
  76         LP8551_I2C_ONLY = LP8550_I2C_ONLY,
  77 };
  78
  79 enum lp8552_brighntess_source {
  80         LP8552_PWM_ONLY = LP8550_PWM_ONLY,
  81         LP8552_I2C_ONLY = LP8550_I2C_ONLY,
  82 };
  83
  84 enum lp8553_brighntess_source {
  85         LP8553_PWM_ONLY = LP8550_PWM_ONLY,
  86         LP8553_I2C_ONLY = LP8550_I2C_ONLY,
  87 };
  88
  89 enum 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
  96 struct lp855x_pwm_data {
  97         void (*pwm_set_intensity) (int brightness, int max_brightness);
  98         int (*pwm_get_intensity) (int max_brightness);
  99 };
 100
 101 struct 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  */
 120 struct 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