1 .. SPDX-License-Identifier: GPL-2.0
2
3 =========================================
4 The device for Mediatek MT6370 RGB LED
5 =========================================
6
7 Description
8 -----------
9
10 The MT6370 integrates a four-channel RGB LED d
11 variety of lighting effect for mobile device a
12 includes a smart LED string controller and it
13 a sink current up to 24mA and a CHG_VIN power
14 current up to 6mA. It provides three operation
15 PWM Dimming mode, breath pattern mode, and con
16 can increase or decrease the brightness of the
17
18 The breath pattern for a channel can be progra
19 using the hw_pattern attribute.
20
21 /sys/class/leds/<led>/hw_pattern
22 --------------------------------
23
24 Specify a hardware breath pattern for a MT6370
25
26 The breath pattern is a series of timing pairs
27 milliseconds. And the brightness is controlled
28 '/sys/class/leds/<led>/brightness'. The patter
29 setting. Hardware pattern only controls the ti
30 depending on the current brightness setting.
31
32 Pattern diagram::
33
34 "0 Tr1 0 Tr2 0 Tf1 0 Tf2 0 Ton 0 Toff
35
36 ^
37 | ============
38 | / \
39 Icurr | / \
40 | / \
41 | / \
42 | / \
43 | --- ---
44 |--- ---
45 +----------------------------------=
46 < Tr1><Tr2>< Ton ><Tf1><Tf2 ><
47
48 Timing description:
49
50 * Tr1: First rising time for 0% - 30% loa
51 * Tr2: Second rising time for 31% - 100%
52 * Ton: On time for 100% load.
53 * Tf1: First falling time for 100% - 31%
54 * Tf2: Second falling time for 30% to 0%
55 * Toff: Off time for 0% load.
56
57 * Tr1/Tr2/Tf1/Tf2/Ton: 125ms to 3125ms, 200m
58 * Toff: 250ms to 6250ms, 400ms per step.
59
60 Pattern example::
61
62 "0 125 0 125 0 125 0 125 0 625 0 1050"
63
64 This Will configure Tr1/Tr2/Tf1/Tf2 to 125m, T
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