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1 | Kernel driver for lp5523 |
2 | ======================== |
3 | |
4 | * National Semiconductor LP5523 led driver chip |
5 | * Datasheet: http://www.national.com/pf/LP/LP5523.html |
6 | |
7 | Authors: Mathias Nyman, Yuri Zaporozhets, Samu Onkalo |
8 | Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com) |
9 | |
10 | Description |
11 | ----------- |
12 | LP5523 can drive up to 9 channels. Leds can be controlled directly via |
13 | the led class control interface. Channels have generic names: |
14 | lp5523:channelx where x is 0...8 |
15 | |
16 | The chip provides 3 engines. Each engine can control channels without |
17 | interaction from the main CPU. Details of the micro engine code can be found |
18 | from the public data sheet. Leds can be muxed to different channels. |
19 | |
20 | Control interface for the engines: |
21 | x is 1 .. 3 |
22 | enginex_mode : disabled, load, run |
23 | enginex_load : microcode load (visible only in load mode) |
24 | enginex_leds : led mux control (visible only in load mode) |
25 | |
26 | cd /sys/class/leds/lp5523:channel2/device |
27 | echo "load" > engine3_mode |
28 | echo "9d80400004ff05ff437f0000" > engine3_load |
29 | echo "111111111" > engine3_leds |
30 | echo "run" > engine3_mode |
31 | |
32 | sysfs contains a selftest entry. It measures each channel |
33 | voltage level and checks if it looks reasonable. If the level is too high, |
34 | the led is missing; if the level is too low, there is a short circuit. |
35 | |
36 | Selftest uses always the current from the platform data. |
37 | |
38 | Each channel contains led current settings. |
39 | /sys/class/leds/lp5523:channel2/led_current - RW |
40 | /sys/class/leds/lp5523:channel2/max_current - RO |
41 | Format: 10x mA i.e 10 means 1.0 mA |
42 | |
43 | Example platform data: |
44 | |
45 | Note - chan_nr can have values between 0 and 8. |
46 | |
47 | static struct lp5523_led_config lp5523_led_config[] = { |
48 | { |
49 | .chan_nr = 0, |
50 | .led_current = 50, |
51 | .max_current = 130, |
52 | }, |
53 | ... |
54 | }, { |
55 | .chan_nr = 8, |
56 | .led_current = 50, |
57 | .max_current = 130, |
58 | } |
59 | }; |
60 | |
61 | static int lp5523_setup(void) |
62 | { |
63 | /* Setup HW resources */ |
64 | } |
65 | |
66 | static void lp5523_release(void) |
67 | { |
68 | /* Release HW resources */ |
69 | } |
70 | |
71 | static void lp5523_enable(bool state) |
72 | { |
73 | /* Control chip enable signal */ |
74 | } |
75 | |
76 | static struct lp5523_platform_data lp5523_platform_data = { |
77 | .led_config = lp5523_led_config, |
78 | .num_channels = ARRAY_SIZE(lp5523_led_config), |
79 | .clock_mode = LP5523_CLOCK_EXT, |
80 | .setup_resources = lp5523_setup, |
81 | .release_resources = lp5523_release, |
82 | .enable = lp5523_enable, |
83 | }; |
84 |
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