linux-stable/include/linux/lp855x.h
Kim, Milo 7be865ab86 backlight: new backlight driver for LP855x devices
THis driver supports TI LP8550/LP8551/LP8552/LP8553/LP8556 backlight
devices.

The brightness can be controlled by the I2C or PWM input.  The lp855x
driver provides both modes.  For the PWM control, pwm-specific functions
can be defined in the platform data.  And some information can be read
via the sysfs(lp855x device attributes).

For details, please refer to Documentation/backlight/lp855x-driver.txt.

[axel.lin@gmail.com: add missing mutex_unlock in lp855x_read_byte() error path]
[axel.lin@gmail.com: check platform data in lp855x_probe()]
[axel.lin@gmail.com: small cleanups]
[dan.carpenter@oracle.com: silence a compiler warning]
[axel.lin@gmail.com: use id->driver_data to differentiate lp855x chips]
[akpm@linux-foundation.org: simplify boolean return expression]
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-23 16:58:33 -07:00

131 lines
3.3 KiB
C

/*
* LP855x Backlight Driver
*
* Copyright (C) 2011 Texas Instruments
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef _LP855X_H
#define _LP855X_H
#define BL_CTL_SHFT (0)
#define BRT_MODE_SHFT (1)
#define BRT_MODE_MASK (0x06)
/* Enable backlight. Only valid when BRT_MODE=10(I2C only) */
#define ENABLE_BL (1)
#define DISABLE_BL (0)
#define I2C_CONFIG(id) id ## _I2C_CONFIG
#define PWM_CONFIG(id) id ## _PWM_CONFIG
/* DEVICE CONTROL register - LP8550 */
#define LP8550_PWM_CONFIG (LP8550_PWM_ONLY << BRT_MODE_SHFT)
#define LP8550_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
(LP8550_I2C_ONLY << BRT_MODE_SHFT))
/* DEVICE CONTROL register - LP8551 */
#define LP8551_PWM_CONFIG LP8550_PWM_CONFIG
#define LP8551_I2C_CONFIG LP8550_I2C_CONFIG
/* DEVICE CONTROL register - LP8552 */
#define LP8552_PWM_CONFIG LP8550_PWM_CONFIG
#define LP8552_I2C_CONFIG LP8550_I2C_CONFIG
/* DEVICE CONTROL register - LP8553 */
#define LP8553_PWM_CONFIG LP8550_PWM_CONFIG
#define LP8553_I2C_CONFIG LP8550_I2C_CONFIG
/* DEVICE CONTROL register - LP8556 */
#define LP8556_PWM_CONFIG (LP8556_PWM_ONLY << BRT_MODE_SHFT)
#define LP8556_COMB1_CONFIG (LP8556_COMBINED1 << BRT_MODE_SHFT)
#define LP8556_I2C_CONFIG ((ENABLE_BL << BL_CTL_SHFT) | \
(LP8556_I2C_ONLY << BRT_MODE_SHFT))
#define LP8556_COMB2_CONFIG (LP8556_COMBINED2 << BRT_MODE_SHFT)
/* ROM area boundary */
#define EEPROM_START (0xA0)
#define EEPROM_END (0xA7)
#define EPROM_START (0xA0)
#define EPROM_END (0xAF)
enum lp855x_chip_id {
LP8550,
LP8551,
LP8552,
LP8553,
LP8556,
};
enum lp855x_brightness_ctrl_mode {
PWM_BASED = 1,
REGISTER_BASED,
};
enum lp8550_brighntess_source {
LP8550_PWM_ONLY,
LP8550_I2C_ONLY = 2,
};
enum lp8551_brighntess_source {
LP8551_PWM_ONLY = LP8550_PWM_ONLY,
LP8551_I2C_ONLY = LP8550_I2C_ONLY,
};
enum lp8552_brighntess_source {
LP8552_PWM_ONLY = LP8550_PWM_ONLY,
LP8552_I2C_ONLY = LP8550_I2C_ONLY,
};
enum lp8553_brighntess_source {
LP8553_PWM_ONLY = LP8550_PWM_ONLY,
LP8553_I2C_ONLY = LP8550_I2C_ONLY,
};
enum lp8556_brightness_source {
LP8556_PWM_ONLY,
LP8556_COMBINED1, /* pwm + i2c before the shaper block */
LP8556_I2C_ONLY,
LP8556_COMBINED2, /* pwm + i2c after the shaper block */
};
struct lp855x_pwm_data {
void (*pwm_set_intensity) (int brightness, int max_brightness);
int (*pwm_get_intensity) (int max_brightness);
};
struct lp855x_rom_data {
u8 addr;
u8 val;
};
/**
* struct lp855x_platform_data
* @name : Backlight driver name. If it is not defined, default name is set.
* @mode : brightness control by pwm or lp855x register
* @device_control : value of DEVICE CONTROL register
* @initial_brightness : initial value of backlight brightness
* @pwm_data : platform specific pwm generation functions.
Only valid when mode is PWM_BASED.
* @load_new_rom_data :
0 : use default configuration data
1 : update values of eeprom or eprom registers on loading driver
* @size_program : total size of lp855x_rom_data
* @rom_data : list of new eeprom/eprom registers
*/
struct lp855x_platform_data {
char *name;
enum lp855x_brightness_ctrl_mode mode;
u8 device_control;
int initial_brightness;
struct lp855x_pwm_data pwm_data;
u8 load_new_rom_data;
int size_program;
struct lp855x_rom_data *rom_data;
};
#endif