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147 lines
3.4 KiB
147 lines
3.4 KiB
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Kernel driver for lp5523 |
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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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