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81 lines
1.8 KiB
81 lines
1.8 KiB
==================== |
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Kernel driver lp855x |
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==================== |
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Backlight driver for LP855x ICs |
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Supported chips: |
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Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and |
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LP8557 |
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Author: Milo(Woogyom) Kim <[email protected]> |
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Description |
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----------- |
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* Brightness control |
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Brightness can be controlled by the pwm input or the i2c command. |
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The lp855x driver supports both cases. |
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* Device attributes |
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1) bl_ctl_mode |
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Backlight control mode. |
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Value: pwm based or register based |
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2) chip_id |
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The lp855x chip id. |
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Value: lp8550/lp8551/lp8552/lp8553/lp8555/lp8556/lp8557 |
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Platform data for lp855x |
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------------------------ |
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For supporting platform specific data, the lp855x platform data can be used. |
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* name: |
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Backlight driver name. If it is not defined, default name is set. |
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* device_control: |
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Value of DEVICE CONTROL register. |
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* initial_brightness: |
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Initial value of backlight brightness. |
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* period_ns: |
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Platform specific PWM period value. unit is nano. |
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Only valid when brightness is pwm input mode. |
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* size_program: |
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Total size of lp855x_rom_data. |
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* rom_data: |
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List of new eeprom/eprom registers. |
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Examples |
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======== |
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1) lp8552 platform data: i2c register mode with new eeprom data:: |
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#define EEPROM_A5_ADDR 0xA5 |
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#define EEPROM_A5_VAL 0x4f /* EN_VSYNC=0 */ |
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static struct lp855x_rom_data lp8552_eeprom_arr[] = { |
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{EEPROM_A5_ADDR, EEPROM_A5_VAL}, |
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}; |
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static struct lp855x_platform_data lp8552_pdata = { |
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.name = "lcd-bl", |
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.device_control = I2C_CONFIG(LP8552), |
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.initial_brightness = INITIAL_BRT, |
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.size_program = ARRAY_SIZE(lp8552_eeprom_arr), |
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.rom_data = lp8552_eeprom_arr, |
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}; |
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2) lp8556 platform data: pwm input mode with default rom data:: |
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static struct lp855x_platform_data lp8556_pdata = { |
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.device_control = PWM_CONFIG(LP8556), |
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.initial_brightness = INITIAL_BRT, |
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.period_ns = 1000000, |
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};
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