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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * ImgTec IR Decoder setup for Sharp protocol.
   4 *
   5 * Copyright 2012-2014 Imagination Technologies Ltd.
   6 */
   7
   8#include "img-ir-hw.h"
   9
  10/* Convert Sharp data to a scancode */
  11static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,
  12                                 struct img_ir_scancode_req *request)
  13{
  14        unsigned int addr, cmd, exp, chk;
  15
  16        if (len != 15)
  17                return -EINVAL;
  18
  19        addr = (raw >>   0) & 0x1f;
  20        cmd  = (raw >>   5) & 0xff;
  21        exp  = (raw >>  13) &  0x1;
  22        chk  = (raw >>  14) &  0x1;
  23
  24        /* validate data */
  25        if (!exp)
  26                return -EINVAL;
  27        if (chk)
  28                /* probably the second half of the message */
  29                return -EINVAL;
  30
  31        request->protocol = RC_PROTO_SHARP;
  32        request->scancode = addr << 8 | cmd;
  33        return IMG_IR_SCANCODE;
  34}
  35
  36/* Convert Sharp scancode to Sharp data filter */
  37static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
  38                               struct img_ir_filter *out, u64 protocols)
  39{
  40        unsigned int addr, cmd, exp = 0, chk = 0;
  41        unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
  42
  43        addr   = (in->data >> 8) & 0x1f;
  44        addr_m = (in->mask >> 8) & 0x1f;
  45        cmd    = (in->data >> 0) & 0xff;
  46        cmd_m  = (in->mask >> 0) & 0xff;
  47        if (cmd_m) {
  48                /* if filtering commands, we can only match the first part */
  49                exp   = 1;
  50                exp_m = 1;
  51                chk   = 0;
  52                chk_m = 1;
  53        }
  54
  55        out->data = addr        |
  56                    cmd   <<  5 |
  57                    exp   << 13 |
  58                    chk   << 14;
  59        out->mask = addr_m      |
  60                    cmd_m <<  5 |
  61                    exp_m << 13 |
  62                    chk_m << 14;
  63
  64        return 0;
  65}
  66
  67/*
  68 * Sharp decoder
  69 * See also http://www.sbprojects.com/knowledge/ir/sharp.php
  70 */
  71struct img_ir_decoder img_ir_sharp = {
  72        .type = RC_PROTO_BIT_SHARP,
  73        .control = {
  74                .decoden = 0,
  75                .decodend2 = 1,
  76                .code_type = IMG_IR_CODETYPE_PULSEDIST,
  77                .d1validsel = 1,
  78        },
  79        /* main timings */
  80        .tolerance = 20,        /* 20% */
  81        .timings = {
  82                /* 0 symbol */
  83                .s10 = {
  84                        .pulse = { 320  /* 320 us */ },
  85                        .space = { 680  /* 1 ms period */ },
  86                },
  87                /* 1 symbol */
  88                .s11 = {
  89                        .pulse = { 320  /* 320 us */ },
  90                        .space = { 1680 /* 2 ms period */ },
  91                },
  92                /* free time */
  93                .ft = {
  94                        .minlen = 15,
  95                        .maxlen = 15,
  96                        .ft_min = 5000, /* 5 ms */
  97                },
  98        },
  99        /* scancode logic */
 100        .scancode = img_ir_sharp_scancode,
 101        .filter = img_ir_sharp_filter,
 102};
 103