diff options
Diffstat (limited to 'Documentation/leds/leds-lp55xx.txt')
| -rw-r--r-- | Documentation/leds/leds-lp55xx.txt | 46 |
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 |