107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
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/*
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* ImgTec IR Decoder setup for Sharp protocol.
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*
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* Copyright 2012-2014 Imagination Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include "img-ir-hw.h"
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/* Convert Sharp data to a scancode */
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static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,
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struct img_ir_scancode_req *request)
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{
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unsigned int addr, cmd, exp, chk;
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if (len != 15)
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return -EINVAL;
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addr = (raw >> 0) & 0x1f;
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cmd = (raw >> 5) & 0xff;
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exp = (raw >> 13) & 0x1;
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chk = (raw >> 14) & 0x1;
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/* validate data */
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if (!exp)
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return -EINVAL;
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if (chk)
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/* probably the second half of the message */
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return -EINVAL;
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request->protocol = RC_TYPE_SHARP;
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request->scancode = addr << 8 | cmd;
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return IMG_IR_SCANCODE;
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}
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/* Convert Sharp scancode to Sharp data filter */
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static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
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struct img_ir_filter *out, u64 protocols)
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{
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unsigned int addr, cmd, exp = 0, chk = 0;
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unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
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addr = (in->data >> 8) & 0x1f;
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addr_m = (in->mask >> 8) & 0x1f;
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cmd = (in->data >> 0) & 0xff;
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cmd_m = (in->mask >> 0) & 0xff;
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if (cmd_m) {
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/* if filtering commands, we can only match the first part */
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exp = 1;
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exp_m = 1;
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chk = 0;
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chk_m = 1;
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}
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out->data = addr |
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cmd << 5 |
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exp << 13 |
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chk << 14;
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out->mask = addr_m |
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cmd_m << 5 |
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exp_m << 13 |
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chk_m << 14;
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return 0;
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}
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/*
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* Sharp decoder
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* See also http://www.sbprojects.com/knowledge/ir/sharp.php
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*/
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struct img_ir_decoder img_ir_sharp = {
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.type = RC_BIT_SHARP,
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.control = {
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.decoden = 0,
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.decodend2 = 1,
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.code_type = IMG_IR_CODETYPE_PULSEDIST,
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.d1validsel = 1,
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},
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/* main timings */
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.tolerance = 20, /* 20% */
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.timings = {
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/* 0 symbol */
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.s10 = {
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.pulse = { 320 /* 320 us */ },
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.space = { 680 /* 1 ms period */ },
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},
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/* 1 symbol */
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.s11 = {
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.pulse = { 320 /* 320 us */ },
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.space = { 1680 /* 2 ms period */ },
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},
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/* free time */
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.ft = {
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.minlen = 15,
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.maxlen = 15,
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.ft_min = 5000, /* 5 ms */
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},
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},
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/* scancode logic */
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.scancode = img_ir_sharp_scancode,
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.filter = img_ir_sharp_filter,
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};
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