Documentation/leds/leds-lp5523.rst
Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
LP5523 can drive up to 9 channels. Leds can be controlled directly via the led class control interface. The name of each channel is configurable in the platform data - name and label. There are three options to make the channel name.
a) Define the 'name' in the platform data
To make specific channel name, then use 'name' platform data.
b) Use the 'label' with no 'name' field
For one device name with channel number, then use 'label'.
c) Default
If both fields are NULL, 'lp5523' is used by default.
LP5523 has the internal program memory for running various LED patterns. There are two ways to run LED patterns.
Control interface for the engines:
x is 1 .. 3
enginex_mode: disabled, load, run enginex_load: microcode load enginex_leds: led mux control
::
cd /sys/class/leds/lp5523:channel2/device
echo "load" > engine3_mode
echo "9d80400004ff05ff437f0000" > engine3_load
echo "111111111" > engine3_leds
echo "run" > engine3_mode
To stop the engine::
echo "disabled" > engine3_mode
2) Firmware interface - LP55xx common interface
For the details, please refer to 'firmware' section in leds-lp55xx.txt
LP5523 has three master faders. If a channel is mapped to one of the master faders, its output is dimmed based on the value of the master fader.
For example::
echo "123000123" > master_fader_leds
creates the following channel-fader mappings::
channel 0,6 to master_fader1 channel 1,7 to master_fader2 channel 2,8 to master_fader3
Then, to have 25% of the original output on channel 0,6::
echo 64 > master_fader1
To have 0% of the original output (i.e. no output) channel 1,7::
echo 0 > master_fader2
To have 100% of the original output (i.e. no dimming) on channel 2,8::
echo 255 > master_fader3
To clear all master fader controls::
echo "000000000" > master_fader_leds
Selftest uses always the current from the platform data.
Each channel contains led current settings.
Format: 10x mA i.e 10 means 1.0 mA
Example platform data::
static struct lp55xx_led_config lp5523_led_config[] = {
{
.name = "D1",
.chan_nr = 0,
.led_current = 50,
.max_current = 130,
},
...
{
.chan_nr = 8,
.led_current = 50,
.max_current = 130,
}
};
static int lp5523_setup(void)
{
/* Setup HW resources */
}
static void lp5523_release(void)
{
/* Release HW resources */
}
static void lp5523_enable(bool state)
{
/* Control chip enable signal */
}
static struct lp55xx_platform_data lp5523_platform_data = {
.led_config = lp5523_led_config,
.num_channels = ARRAY_SIZE(lp5523_led_config),
.clock_mode = LP55XX_CLOCK_EXT,
.setup_resources = lp5523_setup,
.release_resources = lp5523_release,
.enable = lp5523_enable,
};
Note chan_nr can have values between 0 and 8.