1 ========================
2 Kernel driver for lp5562
3 ========================
4
5 * TI LP5562 LED Driver
6
7 Author: Milo(Woogyom) Kim <milo.kim@ti.com>
8
9 Description
10 ===========
11
12 LP5562 can drive up to 4 channels. R/G/B and
13 LEDs can be controlled directly via the led
14
15 All four channels can be also controlled usi
16 LP5562 has the internal program memory for r
17 For the details, please refer to 'firmware'
18
19 Device attribute
20 ================
21
22 engine_mux
23 3 Engines are allocated in LP5562, but the n
24 Therefore each channel should be mapped to t
25
26 Value: RGB or W
27
28 This attribute is used for programming LED d
29 Unlike the LP5521/LP5523/55231, LP5562 has u
30 so additional sysfs is required
31
32 LED Map
33
34 ===== === ===============================
35 Red ... Engine 1 (fixed)
36 Green ... Engine 2 (fixed)
37 Blue ... Engine 3 (fixed)
38 White ... Engine 1 or 2 or 3 (selective)
39 ===== === ===============================
40
41 How to load the program data using engine_mux
42 =============================================
43
44 Before loading the LP5562 program data, engi
45 the engine selection and loading the firmwar
46 Engine mux has two different mode, RGB and W
47 RGB is used for loading RGB program data, W
48
49 For example, run blinking green channel patt
50
51 echo 2 > /sys/bus/i2c/devices/xxxx/select_
52 echo "RGB" > /sys/bus/i2c/devices/xxxx/eng
53 echo 1 > /sys/class/firmware/lp5562/loadin
54 echo "4000600040FF6000" > /sys/class/firmw
55 echo 0 > /sys/class/firmware/lp5562/loadin
56 echo 1 > /sys/bus/i2c/devices/xxxx/run_eng
57
58 To run a blinking white pattern::
59
60 echo 1 or 2 or 3 > /sys/bus/i2c/devices/xx
61 echo "W" > /sys/bus/i2c/devices/xxxx/engin
62 echo 1 > /sys/class/firmware/lp5562/loadin
63 echo "4000600040FF6000" > /sys/class/firmw
64 echo 0 > /sys/class/firmware/lp5562/loadin
65 echo 1 > /sys/bus/i2c/devices/xxxx/run_eng
66
67 How to load the predefined patterns
68 ===================================
69
70 Please refer to 'leds-lp55xx.txt"
71
72 Setting Current of Each Channel
73 ===============================
74
75 Like LP5521 and LP5523/55231, LP5562 provide
76 The 'led_current' and 'max_current' are used
77
78 Example of Platform data
79 ========================
80
81 ::
82
83 static struct lp55xx_led_config lp5562
84 {
85 .name = "R",
86 .chan_nr = 0,
87 .led_current = 20,
88 .max_current = 40,
89 },
90 {
91 .name = "G",
92 .chan_nr = 1,
93 .led_current = 20,
94 .max_current = 40,
95 },
96 {
97 .name = "B",
98 .chan_nr = 2,
99 .led_current = 20,
100 .max_current = 40,
101 },
102 {
103 .name = "W",
104 .chan_nr = 3,
105 .led_current = 20,
106 .max_current = 40,
107 },
108 };
109
110 static int lp5562_setup(void)
111 {
112 /* setup HW resources */
113 }
114
115 static void lp5562_release(void)
116 {
117 /* Release HW resources */
118 }
119
120 static void lp5562_enable(bool state)
121 {
122 /* Control of chip enable sign
123 }
124
125 static struct lp55xx_platform_data lp5
126 .led_config = lp5562_led_c
127 .num_channels = ARRAY_SIZE(l
128 .setup_resources = lp5562_se
129 .release_resources = lp5562_re
130 .enable = lp5562_en
131 };
132
133 To configure the platform specific data, lp55x
134
135
136 If the current is set to 0 in the platform dat
137 disabled and it is not visible in the sysfs.
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