Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
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. 14 The name of each channel is configurable in the platform data - name and label. 15 There are three options to make the channel name. 16 17 a) Define the 'name' in the platform data 18 To make specific channel name, then use 'name' platform data. 19 /sys/class/leds/R1 (name: 'R1') 20 /sys/class/leds/B1 (name: 'B1') 21 22 b) Use the 'label' with no 'name' field 23 For one device name with channel number, then use 'label'. 24 /sys/class/leds/RGB:channelN (label: 'RGB', N: 0 ~ 8) 25 26 c) Default 27 If both fields are NULL, 'lp5523' is used by default. 28 /sys/class/leds/lp5523:channelN (N: 0 ~ 8) 29 30 LP5523 has the internal program memory for running various LED patterns. 31 There are two ways to run LED patterns. 32 33 1) Legacy interface - enginex_mode, enginex_load and enginex_leds 34 Control interface for the engines: 35 x is 1 .. 3 36 enginex_mode : disabled, load, run 37 enginex_load : microcode load 38 enginex_leds : led mux control 39 40 cd /sys/class/leds/lp5523:channel2/device 41 echo "load" > engine3_mode 42 echo "9d80400004ff05ff437f0000" > engine3_load 43 echo "111111111" > engine3_leds 44 echo "run" > engine3_mode 45 46 To stop the engine: 47 echo "disabled" > engine3_mode 48 49 2) Firmware interface - LP55xx common interface 50 For the details, please refer to 'firmware' section in leds-lp55xx.txt 51 52 LP5523 has three master faders. If a channel is mapped to one of 53 the master faders, its output is dimmed based on the value of the master 54 fader. 55 56 For example, 57 58 echo "123000123" > master_fader_leds 59 60 creates the following channel-fader mappings: 61 62 channel 0,6 to master_fader1 63 channel 1,7 to master_fader2 64 channel 2,8 to master_fader3 65 66 Then, to have 25% of the original output on channel 0,6: 67 68 echo 64 > master_fader1 69 70 To have 0% of the original output (i.e. no output) channel 1,7: 71 72 echo 0 > master_fader2 73 74 To have 100% of the original output (i.e. no dimming) on channel 2,8: 75 76 echo 255 > master_fader3 77 78 To clear all master fader controls: 79 80 echo "000000000" > master_fader_leds 81 82 Selftest uses always the current from the platform data. 83 84 Each channel contains led current settings. 85 /sys/class/leds/lp5523:channel2/led_current - RW 86 /sys/class/leds/lp5523:channel2/max_current - RO 87 Format: 10x mA i.e 10 means 1.0 mA 88 89 Example platform data: 90 91 Note - chan_nr can have values between 0 and 8. 92 93 static struct lp55xx_led_config lp5523_led_config[] = { 94 { 95 .name = "D1", 96 .chan_nr = 0, 97 .led_current = 50, 98 .max_current = 130, 99 }, 100 ... 101 { 102 .chan_nr = 8, 103 .led_current = 50, 104 .max_current = 130, 105 } 106 }; 107 108 static int lp5523_setup(void) 109 { 110 /* Setup HW resources */ 111 } 112 113 static void lp5523_release(void) 114 { 115 /* Release HW resources */ 116 } 117 118 static void lp5523_enable(bool state) 119 { 120 /* Control chip enable signal */ 121 } 122 123 static struct lp55xx_platform_data lp5523_platform_data = { 124 .led_config = lp5523_led_config, 125 .num_channels = ARRAY_SIZE(lp5523_led_config), 126 .clock_mode = LP55XX_CLOCK_EXT, 127 .setup_resources = lp5523_setup, 128 .release_resources = lp5523_release, 129 .enable = lp5523_enable, 130 };