drivers/media/rc/img-ir/img-ir-sanyo.c

   1 /*
   2  * ImgTec IR Decoder setup for Sanyo protocol.
   3  *
   4  * Copyright 2012-2014 Imagination Technologies Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * From ir-sanyo-decoder.c:
  12  *
  13  * This protocol uses the NEC protocol timings. However, data is formatted as:
  14  *      13 bits Custom Code
  15  *      13 bits NOT(Custom Code)
  16  *      8 bits Key data
  17  *      8 bits NOT(Key data)
  18  *
  19  * According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon
  20  * Information for this protocol is available at the Sanyo LC7461 datasheet.
  21  */
  22
  23 #include "img-ir-hw.h"
  24
  25 /* Convert Sanyo data to a scancode */
  26 static int img_ir_sanyo_scancode(int len, u64 raw, u64 enabled_protocols,
  27                                  struct img_ir_scancode_req *request)
  28 {
  29         unsigned int addr, addr_inv, data, data_inv;
  30         /* a repeat code has no data */
  31         if (!len)
  32                 return IMG_IR_REPEATCODE;
  33         if (len != 42)
  34                 return -EINVAL;
  35         addr     = (raw >>  0) & 0x1fff;
  36         addr_inv = (raw >> 13) & 0x1fff;
  37         data     = (raw >> 26) & 0xff;
  38         data_inv = (raw >> 34) & 0xff;
  39         /* Validate data */
  40         if ((data_inv ^ data) != 0xff)
  41                 return -EINVAL;
  42         /* Validate address */
  43         if ((addr_inv ^ addr) != 0x1fff)
  44                 return -EINVAL;
  45
  46         /* Normal Sanyo */
  47         request->protocol = RC_TYPE_SANYO;
  48         request->scancode = addr << 8 | data;
  49         return IMG_IR_SCANCODE;
  50 }
  51
  52 /* Convert Sanyo scancode to Sanyo data filter */
  53 static int img_ir_sanyo_filter(const struct rc_scancode_filter *in,
  54                                struct img_ir_filter *out, u64 protocols)
  55 {
  56         unsigned int addr, addr_inv, data, data_inv;
  57         unsigned int addr_m, data_m;
  58
  59         data = in->data & 0xff;
  60         data_m = in->mask & 0xff;
  61         data_inv = data ^ 0xff;
  62
  63         if (in->data & 0xff700000)
  64                 return -EINVAL;
  65
  66         addr       = (in->data >> 8) & 0x1fff;
  67         addr_m     = (in->mask >> 8) & 0x1fff;
  68         addr_inv   = addr ^ 0x1fff;
  69
  70         out->data = (u64)data_inv << 34 |
  71                     (u64)data     << 26 |
  72                          addr_inv << 13 |
  73                          addr;
  74         out->mask = (u64)data_m << 34 |
  75                     (u64)data_m << 26 |
  76                          addr_m << 13 |
  77                          addr_m;
  78         return 0;
  79 }
  80
  81 /* Sanyo decoder */
  82 struct img_ir_decoder img_ir_sanyo = {
  83         .type = RC_BIT_SANYO,
  84         .control = {
  85                 .decoden = 1,
  86                 .code_type = IMG_IR_CODETYPE_PULSEDIST,
  87         },
  88         /* main timings */
  89         .unit = 562500, /* 562.5 us */
  90         .timings = {
  91                 /* leader symbol */
  92                 .ldr = {
  93                         .pulse = { 16   /* 9ms */ },
  94                         .space = { 8    /* 4.5ms */ },
  95                 },
  96                 /* 0 symbol */
  97                 .s00 = {
  98                         .pulse = { 1    /* 562.5 us */ },
  99                         .space = { 1    /* 562.5 us */ },
 100                 },
 101                 /* 1 symbol */
 102                 .s01 = {
 103                         .pulse = { 1    /* 562.5 us */ },
 104                         .space = { 3    /* 1687.5 us */ },
 105                 },
 106                 /* free time */
 107                 .ft = {
 108                         .minlen = 42,
 109                         .maxlen = 42,
 110                         .ft_min = 10,   /* 5.625 ms */
 111                 },
 112         },
 113         /* repeat codes */
 114         .repeat = 108,                  /* 108 ms */
 115         .rtimings = {
 116                 /* leader symbol */
 117                 .ldr = {
 118                         .space = { 4    /* 2.25 ms */ },
 119                 },
 120                 /* free time */
 121                 .ft = {
 122                         .minlen = 0,    /* repeat code has no data */
 123                         .maxlen = 0,
 124                 },
 125         },
 126         /* scancode logic */
 127         .scancode = img_ir_sanyo_scancode,
 128         .filter = img_ir_sanyo_filter,
 129 };