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-rw-r--r--Documentation/leds/leds-lp5521.txt63
1 files changed, 63 insertions, 0 deletions
diff --git a/Documentation/leds/leds-lp5521.txt b/Documentation/leds/leds-lp5521.txt
index c4d8d15..0e542ab 100644
--- a/Documentation/leds/leds-lp5521.txt
+++ b/Documentation/leds/leds-lp5521.txt
@@ -43,17 +43,23 @@ 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 lp5521_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,
@@ -86,3 +92,60 @@ static struct lp5521_platform_data lp5521_platform_data = {
If the current is set to 0 in the platform data, that channel is
disabled and it is not visible in the sysfs.
+
+The 'update_config' : CONFIG register (ADDR 08h)
+This value is platform-specific data.
+If update_config is not defined, the CONFIG register is set with
+'LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT'.
+(Enable auto-powersave, set charge pump to auto, red to battery)
+
+example of update_config :
+
+#define LP5521_CONFIGS (LP5521_PWM_HF | LP5521_PWRSAVE_EN | \
+ LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT | \
+ LP5521_CLK_INT)
+
+static struct lp5521_platform_data lp5521_pdata = {
+ .led_config = lp5521_led_config,
+ .num_channels = ARRAY_SIZE(lp5521_led_config),
+ .clock_mode = LP5521_CLOCK_INT,
+ .update_config = LP5521_CONFIGS,
+};
+
+LED patterns : LP5521 has autonomous operation without external control.
+Pattern data can be defined in the platform data.
+
+example of led pattern data :
+
+/* RGB(50,5,0) 500ms on, 500ms off, infinite loop */
+static u8 pattern_red[] = {
+ 0x40, 0x32, 0x60, 0x00, 0x40, 0x00, 0x60, 0x00,
+ };
+
+static u8 pattern_green[] = {
+ 0x40, 0x05, 0x60, 0x00, 0x40, 0x00, 0x60, 0x00,
+ };
+
+static struct lp5521_led_pattern board_led_patterns[] = {
+ {
+ .r = pattern_red,
+ .g = pattern_green,
+ .size_r = ARRAY_SIZE(pattern_red),
+ .size_g = ARRAY_SIZE(pattern_green),
+ },
+};
+
+static struct lp5521_platform_data lp5521_platform_data = {
+ .led_config = lp5521_led_config,
+ .num_channels = ARRAY_SIZE(lp5521_led_config),
+ .clock_mode = LP5521_CLOCK_EXT,
+ .patterns = board_led_patterns,
+ .num_patterns = ARRAY_SIZE(board_led_patterns),
+};
+
+Then predefined led pattern(s) can be executed via the sysfs.
+To start the pattern #1,
+# echo 1 > /sys/bus/i2c/devices/xxxx/led_pattern
+(xxxx : i2c bus & slave address)
+To end the pattern,
+# echo 0 > /sys/bus/i2c/devices/xxxx/led_pattern