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