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
   7 #include "img-ir-hw.h"
   8
   9 /* Convert Sharp data to a scancode */
  10 static int img_ir_sharp_scancode(int len, u64 raw, int *scancode, u64 protocols)
  11 {
  12         unsigned int addr, cmd, exp, chk;
  13
  14         if (len != 15)
  15                 return -EINVAL;
  16
  17         addr = (raw >>   0) & 0x1f;
  18         cmd  = (raw >>   5) & 0xff;
  19         exp  = (raw >>  13) &  0x1;
  20         chk  = (raw >>  14) &  0x1;
  21
  22         /* validate data */
  23         if (!exp)
  24                 return -EINVAL;
  25         if (chk)
  26                 /* probably the second half of the message */
  27                 return -EINVAL;
  28
  29         *scancode = addr << 8 | cmd;
  30         return IMG_IR_SCANCODE;
  31 }
  32
  33 /* Convert Sharp scancode to Sharp data filter */
  34 static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
  35                                struct img_ir_filter *out, u64 protocols)
  36 {
  37         unsigned int addr, cmd, exp = 0, chk = 0;
  38         unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
  39
  40         addr   = (in->data >> 8) & 0x1f;
  41         addr_m = (in->mask >> 8) & 0x1f;
  42         cmd    = (in->data >> 0) & 0xff;
  43         cmd_m  = (in->mask >> 0) & 0xff;
  44         if (cmd_m) {
  45                 /* if filtering commands, we can only match the first part */
  46                 exp   = 1;
  47                 exp_m = 1;
  48                 chk   = 0;
  49                 chk_m = 1;
  50         }
  51
  52         out->data = addr        |
  53                     cmd   <<  5 |
  54                     exp   << 13 |
  55                     chk   << 14;
  56         out->mask = addr_m      |
  57                     cmd_m <<  5 |
  58                     exp_m << 13 |
  59                     chk_m << 14;
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * Sharp decoder
  66  * See also http://www.sbprojects.com/knowledge/ir/sharp.php
  67  */
  68 struct img_ir_decoder img_ir_sharp = {
  69         .type = RC_BIT_SHARP,
  70         .control = {
  71                 .decoden = 0,
  72                 .decodend2 = 1,
  73                 .code_type = IMG_IR_CODETYPE_PULSEDIST,
  74                 .d1validsel = 1,
  75         },
  76         /* main timings */
  77         .tolerance = 20,        /* 20% */
  78         .timings = {
  79                 /* 0 symbol */
  80                 .s10 = {
  81                         .pulse = { 320  /* 320 us */ },
  82                         .space = { 680  /* 1 ms period */ },
  83                 },
  84                 /* 1 symbol */
  85                 .s11 = {
  86                         .pulse = { 320  /* 320 us */ },
  87                         .space = { 1680 /* 2 ms period */ },
  88                 },
  89                 /* free time */
  90                 .ft = {
  91                         .minlen = 15,
  92                         .maxlen = 15,
  93                         .ft_min = 5000, /* 5 ms */
  94                 },
  95         },
  96         /* scancode logic */
  97         .scancode = img_ir_sharp_scancode,
  98         .filter = img_ir_sharp_filter,
  99 };