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

   1/*
   2 * ImgTec IR Decoder setup for Sony (SIRC) 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 Sony data to a scancode */
  15static int img_ir_sony_scancode(int len, u64 raw, u64 enabled_protocols,
  16                                struct img_ir_scancode_req *request)
  17{
  18        unsigned int dev, subdev, func;
  19
  20        switch (len) {
  21        case 12:
  22                if (!(enabled_protocols & RC_PROTO_BIT_SONY12))
  23                        return -EINVAL;
  24                func   = raw & 0x7f;    /* first 7 bits */
  25                raw    >>= 7;
  26                dev    = raw & 0x1f;    /* next 5 bits */
  27                subdev = 0;
  28                request->protocol = RC_PROTO_SONY12;
  29                break;
  30        case 15:
  31                if (!(enabled_protocols & RC_PROTO_BIT_SONY15))
  32                        return -EINVAL;
  33                func   = raw & 0x7f;    /* first 7 bits */
  34                raw    >>= 7;
  35                dev    = raw & 0xff;    /* next 8 bits */
  36                subdev = 0;
  37                request->protocol = RC_PROTO_SONY15;
  38                break;
  39        case 20:
  40                if (!(enabled_protocols & RC_PROTO_BIT_SONY20))
  41                        return -EINVAL;
  42                func   = raw & 0x7f;    /* first 7 bits */
  43                raw    >>= 7;
  44                dev    = raw & 0x1f;    /* next 5 bits */
  45                raw    >>= 5;
  46                subdev = raw & 0xff;    /* next 8 bits */
  47                request->protocol = RC_PROTO_SONY20;
  48                break;
  49        default:
  50                return -EINVAL;
  51        }
  52        request->scancode = dev << 16 | subdev << 8 | func;
  53        return IMG_IR_SCANCODE;
  54}
  55
  56/* Convert NEC scancode to NEC data filter */
  57static int img_ir_sony_filter(const struct rc_scancode_filter *in,
  58                              struct img_ir_filter *out, u64 protocols)
  59{
  60        unsigned int dev, subdev, func;
  61        unsigned int dev_m, subdev_m, func_m;
  62        unsigned int len = 0;
  63
  64        dev      = (in->data >> 16) & 0xff;
  65        dev_m    = (in->mask >> 16) & 0xff;
  66        subdev   = (in->data >> 8)  & 0xff;
  67        subdev_m = (in->mask >> 8)  & 0xff;
  68        func     = (in->data >> 0)  & 0x7f;
  69        func_m   = (in->mask >> 0)  & 0x7f;
  70
  71        protocols &= RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |
  72                                                        RC_PROTO_BIT_SONY20;
  73
  74        /*
  75         * If only one bit is set, we were requested to do an exact
  76         * protocol. This should be the case for wakeup filters; for
  77         * normal filters, guess the protocol from the scancode.
  78         */
  79        if (!is_power_of_2(protocols)) {
  80                if (subdev & subdev_m)
  81                        protocols = RC_PROTO_BIT_SONY20;
  82                else if (dev & dev_m & 0xe0)
  83                        protocols = RC_PROTO_BIT_SONY15;
  84                else
  85                        protocols = RC_PROTO_BIT_SONY12;
  86        }
  87
  88        if (protocols == RC_PROTO_BIT_SONY20) {
  89                /* can't encode subdev and higher device bits */
  90                if (dev & dev_m & 0xe0)
  91                        return -EINVAL;
  92                len = 20;
  93                dev_m &= 0x1f;
  94        } else if (protocols == RC_PROTO_BIT_SONY15) {
  95                len = 15;
  96                subdev_m = 0;
  97        } else {
  98                /*
  99                 * The hardware mask cannot distinguish high device bits and low
 100                 * extended bits, so logically AND those bits of the masks
 101                 * together.
 102                 */
 103                subdev_m &= (dev_m >> 5) | 0xf8;
 104                dev_m &= 0x1f;
 105        }
 106
 107        /* ensure there aren't any bits straying between fields */
 108        dev &= dev_m;
 109        subdev &= subdev_m;
 110
 111        /* write the hardware filter */
 112        out->data = func          |
 113                    dev      << 7 |
 114                    subdev   << 15;
 115        out->mask = func_m        |
 116                    dev_m    << 7 |
 117                    subdev_m << 15;
 118
 119        if (len) {
 120                out->minlen = len;
 121                out->maxlen = len;
 122        }
 123        return 0;
 124}
 125
 126/*
 127 * Sony SIRC decoder
 128 * See also http://www.sbprojects.com/knowledge/ir/sirc.php
 129 *          http://picprojects.org.uk/projects/sirc/sonysirc.pdf
 130 */
 131struct img_ir_decoder img_ir_sony = {
 132        .type = RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | RC_PROTO_BIT_SONY20,
 133        .control = {
 134                .decoden = 1,
 135                .code_type = IMG_IR_CODETYPE_PULSELEN,
 136        },
 137        /* main timings */
 138        .unit = 600000, /* 600 us */
 139        .timings = {
 140                /* leader symbol */
 141                .ldr = {
 142                        .pulse = { 4    /* 2.4 ms */ },
 143                        .space = { 1    /* 600 us */ },
 144                },
 145                /* 0 symbol */
 146                .s00 = {
 147                        .pulse = { 1    /* 600 us */ },
 148                        .space = { 1    /* 600 us */ },
 149                },
 150                /* 1 symbol */
 151                .s01 = {
 152                        .pulse = { 2    /* 1.2 ms */ },
 153                        .space = { 1    /* 600 us */ },
 154                },
 155                /* free time */
 156                .ft = {
 157                        .minlen = 12,
 158                        .maxlen = 20,
 159                        .ft_min = 10,   /* 6 ms */
 160                },
 161        },
 162        /* scancode logic */
 163        .scancode = img_ir_sony_scancode,
 164        .filter = img_ir_sony_filter,
 165};
 166