https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: b0c3844d8af6b9f3f18f31e1b0502fbefa2166be authored by Linus Torvalds on 16 December 2010, 01:24:48 UTC
Linux 2.6.37-rc6
Linux 2.6.37-rc6
Tip revision: b0c3844
leds-lp3944.txt
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
http://www.national.com/pf/LP/LP3944.html
Authors:
Antonio Ospite <ospite@studenti.unina.it>
Description
-----------
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.
Notes
-----
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));