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Many distributions disable FW_LOADER_USER_HELPER, and this configuration makes lp55xx LEDs completely unusable. Enable their use by only implying the user helper, since the basic LEDs and the hardware patterns can be used with only the sysfs interface. Tested on Nokia N900 with LP5523. Additionally do not refer to the sysfs interface as legacy anymore, since it might be the only one available to users. Signed-off-by: Sicelo A. Mhlongo <absicsz@gmail.com> Signed-off-by: Lee Jones <lee@kernel.org>
147 lines
3.4 KiB
ReStructuredText
147 lines
3.4 KiB
ReStructuredText
========================
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Kernel driver for lp5523
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========================
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* National Semiconductor LP5523 led driver chip
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* Datasheet: http://www.national.com/pf/LP/LP5523.html
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Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo
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Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
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Description
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-----------
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LP5523 can drive up to 9 channels. Leds can be controlled directly via
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the led class control interface.
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The name of each channel is configurable in the platform data - name and label.
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There are three options to make the channel name.
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a) Define the 'name' in the platform data
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To make specific channel name, then use 'name' platform data.
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- /sys/class/leds/R1 (name: 'R1')
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- /sys/class/leds/B1 (name: 'B1')
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b) Use the 'label' with no 'name' field
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For one device name with channel number, then use 'label'.
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- /sys/class/leds/RGB:channelN (label: 'RGB', N: 0 ~ 8)
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c) Default
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If both fields are NULL, 'lp5523' is used by default.
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- /sys/class/leds/lp5523:channelN (N: 0 ~ 8)
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LP5523 has the internal program memory for running various LED patterns.
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There are two ways to run LED patterns.
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1) sysfs interface - enginex_mode, enginex_load and enginex_leds
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Control interface for the engines:
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x is 1 .. 3
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enginex_mode:
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disabled, load, run
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enginex_load:
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microcode load
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enginex_leds:
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led mux control
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::
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cd /sys/class/leds/lp5523:channel2/device
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echo "load" > engine3_mode
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echo "9d80400004ff05ff437f0000" > engine3_load
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echo "111111111" > engine3_leds
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echo "run" > engine3_mode
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To stop the engine::
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echo "disabled" > engine3_mode
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2) Firmware interface - LP55xx common interface
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For the details, please refer to 'firmware' section in leds-lp55xx.txt
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LP5523 has three master faders. If a channel is mapped to one of
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the master faders, its output is dimmed based on the value of the master
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fader.
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For example::
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echo "123000123" > master_fader_leds
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creates the following channel-fader mappings::
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channel 0,6 to master_fader1
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channel 1,7 to master_fader2
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channel 2,8 to master_fader3
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Then, to have 25% of the original output on channel 0,6::
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echo 64 > master_fader1
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To have 0% of the original output (i.e. no output) channel 1,7::
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echo 0 > master_fader2
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To have 100% of the original output (i.e. no dimming) on channel 2,8::
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echo 255 > master_fader3
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To clear all master fader controls::
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echo "000000000" > master_fader_leds
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Selftest uses always the current from the platform data.
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Each channel contains led current settings.
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- /sys/class/leds/lp5523:channel2/led_current - RW
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- /sys/class/leds/lp5523:channel2/max_current - RO
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Format: 10x mA i.e 10 means 1.0 mA
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Example platform data::
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static struct lp55xx_led_config lp5523_led_config[] = {
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{
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.name = "D1",
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.chan_nr = 0,
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.led_current = 50,
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.max_current = 130,
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},
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...
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{
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.chan_nr = 8,
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.led_current = 50,
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.max_current = 130,
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}
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};
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static int lp5523_setup(void)
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{
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/* Setup HW resources */
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}
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static void lp5523_release(void)
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{
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/* Release HW resources */
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}
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static void lp5523_enable(bool state)
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{
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/* Control chip enable signal */
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}
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static struct lp55xx_platform_data lp5523_platform_data = {
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.led_config = lp5523_led_config,
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.num_channels = ARRAY_SIZE(lp5523_led_config),
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.clock_mode = LP55XX_CLOCK_EXT,
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.setup_resources = lp5523_setup,
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.release_resources = lp5523_release,
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.enable = lp5523_enable,
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};
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Note
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chan_nr can have values between 0 and 8.
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