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 */
  15 static 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_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_TYPE_SONY12;
  29                 break;
  30         case 15:
  31                 if (!(enabled_protocols & RC_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_TYPE_SONY15;
  38                 break;
  39         case 20:
  40                 if (!(enabled_protocols & RC_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_TYPE_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 */
  57 static 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         if (subdev & subdev_m) {
  72                 /* can't encode subdev and higher device bits */
  73                 if (dev & dev_m & 0xe0)
  74                         return -EINVAL;
  75                 /* subdevice (extended) bits only in 20 bit encoding */
  76                 if (!(protocols & RC_BIT_SONY20))
  77                         return -EINVAL;
  78                 len = 20;
  79                 dev_m &= 0x1f;
  80         } else if (dev & dev_m & 0xe0) {
  81                 /* upper device bits only in 15 bit encoding */
  82                 if (!(protocols & RC_BIT_SONY15))
  83                         return -EINVAL;
  84                 len = 15;
  85                 subdev_m = 0;
  86         } else {
  87                 /*
  88                  * The hardware mask cannot distinguish high device bits and low
  89                  * extended bits, so logically AND those bits of the masks
  90                  * together.
  91                  */
  92                 subdev_m &= (dev_m >> 5) | 0xf8;
  93                 dev_m &= 0x1f;
  94         }
  95
  96         /* ensure there aren't any bits straying between fields */
  97         dev &= dev_m;
  98         subdev &= subdev_m;
  99
 100         /* write the hardware filter */
 101         out->data = func          |
 102                     dev      << 7 |
 103                     subdev   << 15;
 104         out->mask = func_m        |
 105                     dev_m    << 7 |
 106                     subdev_m << 15;
 107
 108         if (len) {
 109                 out->minlen = len;
 110                 out->maxlen = len;
 111         }
 112         return 0;
 113 }
 114
 115 /*
 116  * Sony SIRC decoder
 117  * See also http://www.sbprojects.com/knowledge/ir/sirc.php
 118  *          http://picprojects.org.uk/projects/sirc/sonysirc.pdf
 119  */
 120 struct img_ir_decoder img_ir_sony = {
 121         .type = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
 122         .control = {
 123                 .decoden = 1,
 124                 .code_type = IMG_IR_CODETYPE_PULSELEN,
 125         },
 126         /* main timings */
 127         .unit = 600000, /* 600 us */
 128         .timings = {
 129                 /* leader symbol */
 130                 .ldr = {
 131                         .pulse = { 4    /* 2.4 ms */ },
 132                         .space = { 1    /* 600 us */ },
 133                 },
 134                 /* 0 symbol */
 135                 .s00 = {
 136                         .pulse = { 1    /* 600 us */ },
 137                         .space = { 1    /* 600 us */ },
 138                 },
 139                 /* 1 symbol */
 140                 .s01 = {
 141                         .pulse = { 2    /* 1.2 ms */ },
 142                         .space = { 1    /* 600 us */ },
 143                 },
 144                 /* free time */
 145                 .ft = {
 146                         .minlen = 12,
 147                         .maxlen = 20,
 148                         .ft_min = 10,   /* 6 ms */
 149                 },
 150         },
 151         /* scancode logic */
 152         .scancode = img_ir_sony_scancode,
 153         .filter = img_ir_sony_filter,
 154 };