8dab91970a
Rename the leds documentation files to ReST, add an index for them and adjust in order to produce a nice html output via the Sphinx build system. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
148 lines
3.4 KiB
ReStructuredText
148 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) Legacy 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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