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Diffstat (limited to 'Documentation/leds/leds-lp5521.txt')
-rw-r--r-- | Documentation/leds/leds-lp5521.txt | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/Documentation/leds/leds-lp5521.txt b/Documentation/leds/leds-lp5521.txt deleted file mode 100644 index d08d8c179f85..000000000000 --- a/Documentation/leds/leds-lp5521.txt +++ /dev/null @@ -1,101 +0,0 @@ -Kernel driver for lp5521 -======================== - -* National Semiconductor LP5521 led driver chip -* Datasheet: http://www.national.com/pf/LP/LP5521.html - -Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo -Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com) - -Description ------------ - -LP5521 can drive up to 3 channels. Leds can be controlled directly via -the led class control interface. Channels have generic names: -lp5521:channelx, where x is 0 .. 2 - -All three channels can be also controlled using the engine micro programs. -More details of the instructions can be found from the public data sheet. - -LP5521 has the internal program memory for running various LED patterns. -There are two ways to run LED patterns. - -1) Legacy interface - enginex_mode and enginex_load - Control interface for the engines: - x is 1 .. 3 - enginex_mode : disabled, load, run - enginex_load : store program (visible only in engine load mode) - - Example (start to blink the channel 2 led): - cd /sys/class/leds/lp5521:channel2/device - echo "load" > engine3_mode - echo "037f4d0003ff6000" > engine3_load - 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 - -sysfs contains a selftest entry. -The test communicates with the chip and checks that -the clock mode is automatically set to the requested one. - -Each channel has its own led current settings. -/sys/class/leds/lp5521:channel0/led_current - RW -/sys/class/leds/lp5521:channel0/max_current - RO -Format: 10x mA i.e 10 means 1.0 mA - -example platform data: - -Note: chan_nr can have values between 0 and 2. -The name of each channel can be configurable. -If the name field is not defined, the default name will be set to 'xxxx:channelN' -(XXXX : pdata->label or i2c client name, N : channel number) - -static struct lp55xx_led_config lp5521_led_config[] = { - { - .name = "red", - .chan_nr = 0, - .led_current = 50, - .max_current = 130, - }, { - .name = "green", - .chan_nr = 1, - .led_current = 0, - .max_current = 130, - }, { - .name = "blue", - .chan_nr = 2, - .led_current = 0, - .max_current = 130, - } -}; - -static int lp5521_setup(void) -{ - /* setup HW resources */ -} - -static void lp5521_release(void) -{ - /* Release HW resources */ -} - -static void lp5521_enable(bool state) -{ - /* Control of chip enable signal */ -} - -static struct lp55xx_platform_data lp5521_platform_data = { - .led_config = lp5521_led_config, - .num_channels = ARRAY_SIZE(lp5521_led_config), - .clock_mode = LP55XX_CLOCK_EXT, - .setup_resources = lp5521_setup, - .release_resources = lp5521_release, - .enable = lp5521_enable, -}; - -If the current is set to 0 in the platform data, that channel is -disabled and it is not visible in the sysfs. |