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LP8555 is one of the LP855x family devices. This device needs pre_init_device() and post_init_device() driver structure. It's same as LP8557, so the device configuration code is shared with LP8557. Backlight outputs are generated from dual DC-DC boost converters. It's configurable EPROM settings which are defined in the platform data. Driver documentation and device tree bindings are updated. Signed-off-by: Milo Kim <milo.kim@ti.com> Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
150 lines
4.1 KiB
C
150 lines
4.1 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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/* CONFIG register - LP8555 */
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#define LP8555_PWM_STANDBY BIT(7)
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#define LP8555_PWM_FILTER BIT(6)
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#define LP8555_RELOAD_EPROM BIT(3) /* use it if EPROMs should be reset
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when the backlight turns on */
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#define LP8555_OFF_OPENLEDS BIT(2)
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#define LP8555_PWM_CONFIG LP8555_PWM_ONLY
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#define LP8555_I2C_CONFIG LP8555_I2C_ONLY
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#define LP8555_COMB1_CONFIG LP8555_COMBINED1
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#define LP8555_COMB2_CONFIG LP8555_COMBINED2
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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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#define LP8556_FAST_CONFIG BIT(7) /* use it if EPROMs should be maintained
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when exiting the low power mode */
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/* CONFIG register - LP8557 */
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#define LP8557_PWM_STANDBY BIT(7)
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#define LP8557_PWM_FILTER BIT(6)
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#define LP8557_RELOAD_EPROM BIT(3) /* use it if EPROMs should be reset
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when the backlight turns on */
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#define LP8557_OFF_OPENLEDS BIT(2)
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#define LP8557_PWM_CONFIG LP8557_PWM_ONLY
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#define LP8557_I2C_CONFIG LP8557_I2C_ONLY
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#define LP8557_COMB1_CONFIG LP8557_COMBINED1
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#define LP8557_COMB2_CONFIG LP8557_COMBINED2
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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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LP8555,
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LP8556,
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LP8557,
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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 lp8555_brightness_source {
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LP8555_PWM_ONLY,
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LP8555_I2C_ONLY,
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LP8555_COMBINED1, /* Brightness register with shaped PWM */
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LP8555_COMBINED2, /* PWM with shaped brightness register */
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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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enum lp8557_brightness_source {
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LP8557_PWM_ONLY,
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LP8557_I2C_ONLY,
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LP8557_COMBINED1, /* pwm + i2c after the shaper block */
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LP8557_COMBINED2, /* pwm + i2c before the shaper block */
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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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* @device_control : value of DEVICE CONTROL register
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* @initial_brightness : initial value of backlight brightness
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* @period_ns : platform specific pwm period value. unit is nano.
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Only valid when mode is PWM_BASED.
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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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const char *name;
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u8 device_control;
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u8 initial_brightness;
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unsigned int period_ns;
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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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