1 What: /sys/class/leds/<led>/pattern 2 Date: September 2018 3 KernelVersion: 4.20 4 Description: 5 Specify a software pattern for the LED, that supports altering 6 the brightness for the specified duration with one software 7 timer. It can do gradual dimming and step change of brightness. 8 9 The pattern is given by a series of tuples, of brightness and 10 duration (ms). 11 12 The exact format is described in: 13 Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt 14 15 What: /sys/class/leds/<led>/hr_pattern 16 Date: April 2024 17 Description: 18 Specify a software pattern for the LED, that supports altering 19 the brightness for the specified duration with one software 20 timer. It can do gradual dimming and step change of brightness. 21 22 Unlike the /sys/class/leds/<led>/pattern, this attribute runs 23 a pattern on high-resolution timer (hrtimer). 24 25 What: /sys/class/leds/<led>/hw_pattern 26 Date: September 2018 27 KernelVersion: 4.20 28 Description: 29 Specify a hardware pattern for the LED, for LED hardware that 30 supports autonomously controlling brightness over time, according 31 to some preprogrammed hardware patterns. It deactivates any active 32 software pattern. 33 34 Since different LED hardware can have different semantics of 35 hardware patterns, each driver is expected to provide its own 36 description for the hardware patterns in their documentation 37 file at Documentation/leds/. 38 39 What: /sys/class/leds/<led>/repeat 40 Date: September 2018 41 KernelVersion: 4.20 42 Description: 43 Specify a pattern repeat number. -1 means repeat indefinitely, 44 other negative numbers and number 0 are invalid. 45 46 This file will always return the originally written repeat 47 number. 48 49 It should be noticed that some leds, like EL15203000 may 50 only support indefinitely patterns, so they always store -1.
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