c0285f8ca8
Update changed platform data information. Add leds-lp55xx.txt which includes the firmware interface description. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
82 lines
2.3 KiB
Plaintext
82 lines
2.3 KiB
Plaintext
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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For the details, please refer to 'firmware' section in leds-lp55xx.txt
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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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Note - chan_nr can have values between 0 and 8.
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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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