diff options
Diffstat (limited to 'Documentation/leds/leds-cht-wcove.rst')
| -rw-r--r-- | Documentation/leds/leds-cht-wcove.rst | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/leds/leds-cht-wcove.rst b/Documentation/leds/leds-cht-wcove.rst new file mode 100644 index 0000000000..5ec7cb60c4 --- /dev/null +++ b/Documentation/leds/leds-cht-wcove.rst @@ -0,0 +1,38 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================================================== +Kernel driver for Intel Cherry Trail Whiskey Cove PMIC LEDs +=========================================================== + +/sys/class/leds/<led>/hw_pattern +-------------------------------- + +Specify a hardware pattern for the Whiskey Cove PMIC LEDs. + +The only supported pattern is hardware breathing mode:: + + "0 2000 1 2000" + + ^ + | + Max-| --- + | / \ + | / \ + | / \ / + | / \ / + Min-|- --- + | + 0------2------4--> time (sec) + +The rise and fall times must be the same value. +Supported values are 2000, 1000, 500 and 250 for +breathing frequencies of 1/4, 1/2, 1 and 2 Hz. + +The set pattern only controls the timing. For max brightness the last +set brightness is used and the max brightness can be changed +while breathing by writing the brightness attribute. + +This is just like how blinking works in the LED subsystem, +for both sw and hw blinking the brightness can also be changed +while blinking. Breathing on this hw really is just a variant +mode of blinking. |