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-Kernel driver lp3944
- * National Semiconductor LP3944 Fun-light Chip
- Prefix: 'lp3944'
- Addresses scanned: None (see the Notes section below)
- Datasheet: Publicly available at the National Semiconductor website
- Antonio Ospite <>
-The LP3944 is a helper chip that can drive up to 8 leds, with two programmable
-DIM modes; it could even be used as a gpio expander but this driver assumes it
-is used as a led controller.
-The DIM modes are used to set _blink_ patterns for leds, the pattern is
-specified supplying two parameters:
- - period: from 0s to 1.6s
- - duty cycle: percentage of the period the led is on, from 0 to 100
-Setting a led in DIM0 or DIM1 mode makes it blink according to the pattern.
-See the datasheet for details.
-LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
-leds, the camera flash light and the lcds power.
-The chip is used mainly in embedded contexts, so this driver expects it is
-registered using the i2c_board_info mechanism.
-To register the chip at address 0x60 on adapter 0, set the platform data
-according to include/linux/leds-lp3944.h, set the i2c board info:
- static struct i2c_board_info __initdata a910_i2c_board_info[] = {
- {
- I2C_BOARD_INFO("lp3944", 0x60),
- .platform_data = &a910_lp3944_leds,
- },
- };
-and register it in the platform init function
- i2c_register_board_info(0, a910_i2c_board_info,
- ARRAY_SIZE(a910_i2c_board_info));