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-rw-r--r--Documentation/leds/leds-lp55xx.txt46
1 files changed, 45 insertions, 1 deletions
diff --git a/Documentation/leds/leds-lp55xx.txt b/Documentation/leds/leds-lp55xx.txt
index ced41868d2d1..eec8fa2ffe4e 100644
--- a/Documentation/leds/leds-lp55xx.txt
+++ b/Documentation/leds/leds-lp55xx.txt
@@ -5,7 +5,7 @@ Authors: Milo(Woogyom) Kim <milo.kim@ti.com>
Description
-----------
-LP5521, LP5523/55231 have common features as below.
+LP5521, LP5523/55231 and LP5562 have common features as below.
Register access via the I2C
Device initialization/deinitialization
@@ -116,3 +116,47 @@ To support this, 'run_engine' and 'firmware_cb' are configurable in each driver.
run_engine : Control the selected engine
firmware_cb : The callback function after loading the firmware is done.
Chip specific commands for loading and updating program memory.
+
+( Predefined pattern data )
+
+Without the firmware interface, LP55xx driver provides another method for
+loading a LED pattern. That is 'predefined' pattern.
+A predefined pattern is defined in the platform data and load it(or them)
+via the sysfs if needed.
+To use the predefined pattern concept, 'patterns' and 'num_patterns' should be
+configured.
+
+ Example of predefined pattern data:
+
+ /* mode_1: blinking data */
+ static const u8 mode_1[] = {
+ 0x40, 0x00, 0x60, 0x00, 0x40, 0xFF, 0x60, 0x00,
+ };
+
+ /* mode_2: always on */
+ static const u8 mode_2[] = { 0x40, 0xFF, };
+
+ struct lp55xx_predef_pattern board_led_patterns[] = {
+ {
+ .r = mode_1,
+ .size_r = ARRAY_SIZE(mode_1),
+ },
+ {
+ .b = mode_2,
+ .size_b = ARRAY_SIZE(mode_2),
+ },
+ }
+
+ struct lp55xx_platform_data lp5562_pdata = {
+ ...
+ .patterns = board_led_patterns,
+ .num_patterns = ARRAY_SIZE(board_led_patterns),
+ };
+
+Then, mode_1 and mode_2 can be run via through the sysfs.
+
+ echo 1 > /sys/bus/i2c/devices/xxxx/led_pattern # red blinking LED pattern
+ echo 2 > /sys/bus/i2c/devices/xxxx/led_pattern # blue LED always on
+
+To stop running pattern,
+ echo 0 > /sys/bus/i2c/devices/xxxx/led_pattern