LXR linux/drivers/media/rc/img-ir/img-ir-sharp.c

   1/*
   2 * ImgTec IR Decoder setup for Sharp 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
  12#include "img-ir-hw.h"
  13
  14/* Convert Sharp data to a scancode */
  15static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,
  16                                 struct img_ir_scancode_req *request)
  17{
  18        unsigned int addr, cmd, exp, chk;
  19
  20        if (len != 15)
  21                return -EINVAL;
  22
  23        addr = (raw >>   0) & 0x1f;
  24        cmd  = (raw >>   5) & 0xff;
  25        exp  = (raw >>  13) &  0x1;
  26        chk  = (raw >>  14) &  0x1;
  27
  28        /* validate data */
  29        if (!exp)
  30                return -EINVAL;
  31        if (chk)
  32                /* probably the second half of the message */
  33                return -EINVAL;
  34
  35        request->protocol = RC_TYPE_SHARP;
  36        request->scancode = addr << 8 | cmd;
  37        return IMG_IR_SCANCODE;
  38}
  39
  40/* Convert Sharp scancode to Sharp data filter */
  41static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
  42                               struct img_ir_filter *out, u64 protocols)
  43{
  44        unsigned int addr, cmd, exp = 0, chk = 0;
  45        unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
  46
  47        addr   = (in->data >> 8) & 0x1f;
  48        addr_m = (in->mask >> 8) & 0x1f;
  49        cmd    = (in->data >> 0) & 0xff;
  50        cmd_m  = (in->mask >> 0) & 0xff;
  51        if (cmd_m) {
  52                /* if filtering commands, we can only match the first part */
  53                exp   = 1;
  54                exp_m = 1;
  55                chk   = 0;
  56                chk_m = 1;
  57        }
  58
  59        out->data = addr        |
  60                    cmd   <<  5 |
  61                    exp   << 13 |
  62                    chk   << 14;
  63        out->mask = addr_m      |
  64                    cmd_m <<  5 |
  65                    exp_m << 13 |
  66                    chk_m << 14;
  67
  68        return 0;
  69}
  70
  71/*
  72 * Sharp decoder
  73 * See also http://www.sbprojects.com/knowledge/ir/sharp.php
  74 */
  75struct img_ir_decoder img_ir_sharp = {
  76        .type = RC_BIT_SHARP,
  77        .control = {
  78                .decoden = 0,
  79                .decodend2 = 1,
  80                .code_type = IMG_IR_CODETYPE_PULSEDIST,
  81                .d1validsel = 1,
  82        },
  83        /* main timings */
  84        .tolerance = 20,        /* 20% */
  85        .timings = {
  86                /* 0 symbol */
  87                .s10 = {
  88                        .pulse = { 320  /* 320 us */ },
  89                        .space = { 680  /* 1 ms period */ },
  90                },
  91                /* 1 symbol */
  92                .s11 = {
  93                        .pulse = { 320  /* 320 us */ },
  94                        .space = { 1680 /* 2 ms period */ },
  95                },
  96                /* free time */
  97                .ft = {
  98                        .minlen = 15,
  99                        .maxlen = 15,
 100                        .ft_min = 5000, /* 5 ms */
 101                },
 102        },
 103        /* scancode logic */
 104        .scancode = img_ir_sharp_scancode,
 105        .filter = img_ir_sharp_filter,
 106};
 107