Documentation\backlight\lp855x-driver
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Documentation\backlight\lp855x-driver的中文翻译
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Kernel driver lp855x
内核驱动程序lp855x
====================
Backlight driver for LP855x ICs
LP855x集成电路的背光驱动程序
Supported chips:Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8556 and LP8557
支持芯片:德州仪器LP8550 , LP8551 , LP8552 , LP8553 , LP8556和LP8557
Author: Milo(Woogyom) Kim <milo.kim@ti.com>
Description
作者:Milo(Woogyom) Kim <milo.kim@ti.com>
Description
Description
-----------
描述
-----------
* Brightnesscontrol
* 亮度控制
Brightness can be controlled by the pwm input or the i2c command.
亮度可以通过PWM输入或者I2C命令加以控制。
The lp855x driver supports both cases.
lp855x驱动程序同时支持这两种方法。
* Device attributes
* 设备属性
1) bl_ctl_mode
Backlight control mode.
Value : pwm based or register based
1) bl_ctl_mode
背光控制模式
意义:基于pwm基础或寄存器
2) chip_id
The lp855x chip id.
Value : lp8550/lp8551/lp8552/lp8553/lp8556/lp8557
2) chip_id
lp855x的芯片ID。
意义:lp8550/lp8551/lp8552/lp8553/lp8556/lp8557
Platform data for lp855x
lp855x的平台数据
------------------------
For supporting platform specific data, the lp855x platform data can be used.
为了支持平台上的特定数据,可以使用lp855x平台数据。
* name : Backlight driver name. If it is not defined, default name is set.
* name : 背光驱动程序的名称。若背光驱动程序的名称未被定义,则使用默认名称。
* device_control : Value of DEVICE CONTROL register.
* device_control : 设备控制寄存器的值。
* initial_brightness : Initial value of backlight brightness.
* initial_brightness : 背光亮度的初始值。
* period_ns : Platform specific PWM period value. unit is nano.Only valid when brightness is pwm input mode.
* period_ns : 平台特定的PWM周期值。单位是纳米。只在亮度是PWM输入模式时有效。
* size_program : Total size of lp855x_rom_data.
* size_program : lp855x_rom_data的总大小。
* rom_data : List of new eeprom/eprom registers.
* rom_data : 新的 EEPROM/EPROM 寄存器名单。
example 1) lp8552 platform data : i2c register mode with new eeprom data
示例 1)lp8552的平台数据:I2C寄存器模式与新的EEPROM数据
#define EEPROM_A5_ADDR 0xA5
#define EEPROM_A5_VAL 0x4f /* EN_VSYNC=0 */
static struct lp855x_rom_data lp8552_eeprom_arr[] = {
{EEPROM_A5_ADDR, EEPROM_A5_VAL},
};
static struct lp855x_platform_data lp8552_pdata = {
.name = "lcd-bl",
.device_control = I2C_CONFIG(LP8552),
.initial_brightness = INITIAL_BRT,
.size_program = ARRAY_SIZE(lp8552_eeprom_arr),
.rom_data = lp8552_eeprom_arr,
};
example 2) lp8556 platform data : pwm input mode with default rom data
示例 2)lp8556的平台数据:PWM输入模式与默认的ROM数据
static struct lp855x_platform_data lp8556_pdata = {
.device_control = PWM_CONFIG(LP8556),
.initial_brightness = INITIAL_BRT,
.period_ns = 1000000,
};
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