summaryrefslogtreecommitdiffstats
path: root/Documentation/leds/leds-lp5523.txt
blob: 0dbbd279c9b92ea4fa579a2a94e5cf3a8e9227d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
Kernel driver for lp5523
========================

* National Semiconductor LP5523 led driver chip
* Datasheet: http://www.national.com/pf/LP/LP5523.html

Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo
Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)

Description
-----------
LP5523 can drive up to 9 channels. Leds can be controlled directly via
the led class control interface.
The name of each channel is configurable in the platform data - name and label.
There are three options to make the channel name.

a) Define the 'name' in the platform data
To make specific channel name, then use 'name' platform data.
/sys/class/leds/R1               (name: 'R1')
/sys/class/leds/B1               (name: 'B1')

b) Use the 'label' with no 'name' field
For one device name with channel number, then use 'label'.
/sys/class/leds/RGB:channelN     (label: 'RGB', N: 0 ~ 8)

c) Default
If both fields are NULL, 'lp5523' is used by default.
/sys/class/leds/lp5523:channelN  (N: 0 ~ 8)

LP5523 has the internal program memory for running various LED patterns.
There are two ways to run LED patterns.

1) Legacy interface - enginex_mode, enginex_load and enginex_leds
  Control interface for the engines:
  x is 1 .. 3
  enginex_mode : disabled, load, run
  enginex_load : microcode load (visible only in load mode)
  enginex_leds : led mux control (visible only in load mode)

  cd /sys/class/leds/lp5523:channel2/device
  echo "load" > engine3_mode
  echo "9d80400004ff05ff437f0000" > engine3_load
  echo "111111111" > engine3_leds
  echo "run" > engine3_mode

  To stop the engine:
  echo "disabled" > engine3_mode

2) Firmware interface - LP55xx common interface
  For the details, please refer to 'firmware' section in leds-lp55xx.txt

LP5523 has three master faders. If a channel is mapped to one of
the master faders, its output is dimmed based on the value of the master
fader.

For example,

  echo "123000123" > master_fader_leds

creates the following channel-fader mappings:

  channel 0,6 to master_fader1
  channel 1,7 to master_fader2
  channel 2,8 to master_fader3

Then, to have 25% of the original output on channel 0,6:

  echo 64 > master_fader1

To have 0% of the original output (i.e. no output) channel 1,7:

  echo 0 > master_fader2

To have 100% of the original output (i.e. no dimming) on channel 2,8:

  echo 255 > master_fader3

To clear all master fader controls:

  echo "000000000" > master_fader_leds

Selftest uses always the current from the platform data.

Each channel contains led current settings.
/sys/class/leds/lp5523:channel2/led_current - RW
/sys/class/leds/lp5523:channel2/max_current - RO
Format: 10x mA i.e 10 means 1.0 mA

Example platform data:

Note - chan_nr can have values between 0 and 8.

static struct lp55xx_led_config lp5523_led_config[] = {
        {
		.name		= "D1",
                .chan_nr        = 0,
                .led_current    = 50,
		.max_current    = 130,
        },
...
        {
                .chan_nr        = 8,
                .led_current    = 50,
		.max_current    = 130,
        }
};

static int lp5523_setup(void)
{
	/* Setup HW resources */
}

static void lp5523_release(void)
{
	/* Release HW resources */
}

static void lp5523_enable(bool state)
{
	/* Control chip enable signal */
}

static struct lp55xx_platform_data lp5523_platform_data = {
        .led_config     = lp5523_led_config,
        .num_channels   = ARRAY_SIZE(lp5523_led_config),
        .clock_mode     = LP55XX_CLOCK_EXT,
        .setup_resources   = lp5523_setup,
        .release_resources = lp5523_release,
        .enable            = lp5523_enable,
};
OpenPOWER on IntegriCloud