LXR linux/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 */
  26static 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 */
  53static 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 */
  82struct 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};
 130