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