mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 02:35:29 +07:00
7be865ab86
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>
132 lines
3.3 KiB
C
132 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
|