2019-05-29 14:17:59 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2010-04-08 23:04:40 +00:00
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/* ir-rc6-decoder.c - A decoder for the RC6 IR protocol
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*
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* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
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*/
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2010-11-10 02:09:57 +00:00
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#include "rc-core-priv.h"
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2011-07-03 18:03:12 +00:00
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#include <linux/module.h>
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2010-04-08 23:04:40 +00:00
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/*
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* This decoder currently supports:
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* RC6-0-16 (standard toggle bit in header)
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2011-10-31 11:39:32 +00:00
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* RC6-6A-20 (no toggle bit)
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2010-04-08 23:04:40 +00:00
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* RC6-6A-24 (no toggle bit)
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* RC6-6A-32 (MCE version with toggle bit in body)
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*/
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2020-08-23 17:23:05 +00:00
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#define RC6_UNIT 444 /* microseconds */
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2010-04-08 23:04:40 +00:00
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#define RC6_HEADER_NBITS 4 /* not including toggle bit */
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#define RC6_0_NBITS 16
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2011-10-31 11:39:32 +00:00
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#define RC6_6A_32_NBITS 32
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#define RC6_6A_NBITS 128 /* Variable 8..128 */
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2010-04-15 21:46:00 +00:00
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#define RC6_PREFIX_PULSE (6 * RC6_UNIT)
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#define RC6_PREFIX_SPACE (2 * RC6_UNIT)
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#define RC6_BIT_START (1 * RC6_UNIT)
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#define RC6_BIT_END (1 * RC6_UNIT)
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#define RC6_TOGGLE_START (2 * RC6_UNIT)
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#define RC6_TOGGLE_END (2 * RC6_UNIT)
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2011-10-31 11:39:32 +00:00
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#define RC6_SUFFIX_SPACE (6 * RC6_UNIT)
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2010-04-08 23:04:40 +00:00
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#define RC6_MODE_MASK 0x07 /* for the header bits */
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#define RC6_STARTBIT_MASK 0x08 /* for the header bits */
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#define RC6_6A_MCE_TOGGLE_MASK 0x8000 /* for the body bits */
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2011-10-31 11:39:32 +00:00
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#define RC6_6A_LCC_MASK 0xffff0000 /* RC6-6A-32 long customer code mask */
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#define RC6_6A_MCE_CC 0x800f0000 /* MCE customer code */
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2019-02-07 09:29:12 +00:00
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#define RC6_6A_ZOTAC_CC 0x80340000 /* Zotac customer code */
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2018-08-28 13:49:42 +00:00
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#define RC6_6A_KATHREIN_CC 0x80460000 /* Kathrein RCU-676 customer code */
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2011-10-31 11:39:32 +00:00
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#ifndef CHAR_BIT
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#define CHAR_BIT 8 /* Normally in <limits.h> */
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#endif
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2010-04-08 23:04:40 +00:00
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enum rc6_mode {
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RC6_MODE_0,
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RC6_MODE_6A,
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RC6_MODE_UNKNOWN,
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};
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enum rc6_state {
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STATE_INACTIVE,
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STATE_PREFIX_SPACE,
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STATE_HEADER_BIT_START,
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STATE_HEADER_BIT_END,
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STATE_TOGGLE_START,
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STATE_TOGGLE_END,
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STATE_BODY_BIT_START,
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STATE_BODY_BIT_END,
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STATE_FINISHED,
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};
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2010-06-13 20:29:36 +00:00
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static enum rc6_mode rc6_mode(struct rc6_dec *data)
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2010-04-08 23:04:40 +00:00
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{
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switch (data->header & RC6_MODE_MASK) {
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case 0:
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return RC6_MODE_0;
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case 6:
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if (!data->toggle)
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return RC6_MODE_6A;
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2020-08-23 22:36:59 +00:00
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fallthrough;
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2010-04-08 23:04:40 +00:00
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default:
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return RC6_MODE_UNKNOWN;
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}
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}
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/**
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* ir_rc6_decode() - Decode one RC6 pulse or space
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2010-10-29 19:08:23 +00:00
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* @dev: the struct rc_dev descriptor of the device
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2010-04-15 21:46:00 +00:00
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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2010-04-08 23:04:40 +00:00
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*
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* This function returns -EINVAL if the pulse violates the state machine
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*/
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2010-10-29 19:08:23 +00:00
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static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
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2010-04-08 23:04:40 +00:00
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{
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2010-10-29 19:08:23 +00:00
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struct rc6_dec *data = &dev->raw->rc6;
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2010-04-08 23:04:40 +00:00
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u32 scancode;
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u8 toggle;
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2017-08-07 20:20:58 +00:00
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enum rc_proto protocol;
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2010-04-08 23:04:40 +00:00
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2010-10-16 22:56:28 +00:00
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if (!is_timing_event(ev)) {
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if (ev.reset)
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data->state = STATE_INACTIVE;
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2010-04-08 23:04:40 +00:00
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return 0;
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}
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2010-04-15 21:46:00 +00:00
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if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
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2010-04-08 23:04:40 +00:00
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goto out;
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again:
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2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6 decode started at state %i (%uus %s)\n",
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2020-08-23 17:23:05 +00:00
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data->state, ev.duration, TO_STR(ev.pulse));
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2010-04-08 23:04:40 +00:00
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2010-04-15 21:46:00 +00:00
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if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
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2010-04-08 23:04:40 +00:00
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return 0;
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switch (data->state) {
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case STATE_INACTIVE:
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2010-04-15 21:46:00 +00:00
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if (!ev.pulse)
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break;
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/* Note: larger margin on first pulse since each RC6_UNIT
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is quite short and some hardware takes some time to
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adjust to the signal */
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if (!eq_margin(ev.duration, RC6_PREFIX_PULSE, RC6_UNIT))
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break;
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data->state = STATE_PREFIX_SPACE;
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data->count = 0;
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return 0;
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2010-04-08 23:04:40 +00:00
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case STATE_PREFIX_SPACE:
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2010-04-15 21:46:00 +00:00
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if (ev.pulse)
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break;
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if (!eq_margin(ev.duration, RC6_PREFIX_SPACE, RC6_UNIT / 2))
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break;
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data->state = STATE_HEADER_BIT_START;
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2011-10-31 11:39:32 +00:00
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data->header = 0;
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2010-04-15 21:46:00 +00:00
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return 0;
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2010-04-08 23:04:40 +00:00
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case STATE_HEADER_BIT_START:
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2010-04-15 21:46:00 +00:00
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if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
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break;
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data->header <<= 1;
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if (ev.pulse)
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data->header |= 1;
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data->count++;
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data->state = STATE_HEADER_BIT_END;
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return 0;
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2010-04-08 23:04:40 +00:00
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case STATE_HEADER_BIT_END:
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2010-04-15 21:46:00 +00:00
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if (data->count == RC6_HEADER_NBITS)
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data->state = STATE_TOGGLE_START;
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else
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data->state = STATE_HEADER_BIT_START;
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decrease_duration(&ev, RC6_BIT_END);
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goto again;
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2010-04-08 23:04:40 +00:00
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case STATE_TOGGLE_START:
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2010-04-15 21:46:00 +00:00
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if (!eq_margin(ev.duration, RC6_TOGGLE_START, RC6_UNIT / 2))
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break;
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data->toggle = ev.pulse;
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data->state = STATE_TOGGLE_END;
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return 0;
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2010-04-08 23:04:40 +00:00
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case STATE_TOGGLE_END:
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2010-04-15 21:46:00 +00:00
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if (!(data->header & RC6_STARTBIT_MASK)) {
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2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6 invalid start bit\n");
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2010-04-15 21:46:00 +00:00
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break;
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}
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2010-04-08 23:04:40 +00:00
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2010-04-15 21:46:00 +00:00
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data->state = STATE_BODY_BIT_START;
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decrease_duration(&ev, RC6_TOGGLE_END);
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data->count = 0;
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2011-10-31 11:39:32 +00:00
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data->body = 0;
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2010-04-15 21:46:00 +00:00
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switch (rc6_mode(data)) {
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case RC6_MODE_0:
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data->wanted_bits = RC6_0_NBITS;
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break;
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case RC6_MODE_6A:
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2011-10-31 11:39:32 +00:00
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data->wanted_bits = RC6_6A_NBITS;
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2010-04-15 21:46:00 +00:00
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break;
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default:
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2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6 unknown mode\n");
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2010-04-15 21:46:00 +00:00
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goto out;
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2010-04-08 23:04:40 +00:00
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}
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2010-04-15 21:46:00 +00:00
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goto again;
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2010-04-08 23:04:40 +00:00
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case STATE_BODY_BIT_START:
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2011-10-31 11:39:32 +00:00
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if (eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2)) {
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/* Discard LSB's that won't fit in data->body */
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if (data->count++ < CHAR_BIT * sizeof data->body) {
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data->body <<= 1;
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if (ev.pulse)
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data->body |= 1;
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}
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data->state = STATE_BODY_BIT_END;
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return 0;
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} else if (RC6_MODE_6A == rc6_mode(data) && !ev.pulse &&
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geq_margin(ev.duration, RC6_SUFFIX_SPACE, RC6_UNIT / 2)) {
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data->state = STATE_FINISHED;
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goto again;
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}
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break;
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2010-04-08 23:04:40 +00:00
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case STATE_BODY_BIT_END:
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2010-04-15 21:46:00 +00:00
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if (data->count == data->wanted_bits)
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data->state = STATE_FINISHED;
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else
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data->state = STATE_BODY_BIT_START;
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decrease_duration(&ev, RC6_BIT_END);
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goto again;
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2010-04-08 23:04:40 +00:00
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case STATE_FINISHED:
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2010-04-15 21:46:00 +00:00
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if (ev.pulse)
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break;
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2010-04-08 23:04:40 +00:00
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switch (rc6_mode(data)) {
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case RC6_MODE_0:
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2011-10-31 11:39:32 +00:00
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scancode = data->body;
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2010-04-08 23:04:40 +00:00
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toggle = data->toggle;
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2017-08-07 20:20:58 +00:00
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protocol = RC_PROTO_RC6_0;
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2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6(0) scancode 0x%04x (toggle: %u)\n",
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scancode, toggle);
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2010-04-08 23:04:40 +00:00
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break;
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2014-04-03 23:31:30 +00:00
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2010-04-08 23:04:40 +00:00
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case RC6_MODE_6A:
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2011-10-31 11:39:32 +00:00
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if (data->count > CHAR_BIT * sizeof data->body) {
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2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6 too many (%u) data bits\n",
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2011-10-31 11:39:32 +00:00
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data->count);
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goto out;
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}
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scancode = data->body;
|
2014-04-03 23:31:30 +00:00
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switch (data->count) {
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case 20:
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2017-08-07 20:20:58 +00:00
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protocol = RC_PROTO_RC6_6A_20;
|
2014-04-03 23:31:30 +00:00
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toggle = 0;
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break;
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case 24:
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2017-08-07 20:20:58 +00:00
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protocol = RC_PROTO_RC6_6A_24;
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2010-04-08 23:04:40 +00:00
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toggle = 0;
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2014-04-03 23:31:30 +00:00
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break;
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case 32:
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2018-08-28 13:49:42 +00:00
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switch (scancode & RC6_6A_LCC_MASK) {
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case RC6_6A_MCE_CC:
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case RC6_6A_KATHREIN_CC:
|
2019-02-07 09:29:12 +00:00
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case RC6_6A_ZOTAC_CC:
|
2017-08-07 20:20:58 +00:00
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protocol = RC_PROTO_RC6_MCE;
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2014-04-03 23:31:30 +00:00
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toggle = !!(scancode & RC6_6A_MCE_TOGGLE_MASK);
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2014-11-20 21:09:54 +00:00
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scancode &= ~RC6_6A_MCE_TOGGLE_MASK;
|
2018-08-28 13:49:42 +00:00
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break;
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default:
|
2017-08-07 20:20:58 +00:00
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protocol = RC_PROTO_RC6_6A_32;
|
2014-04-03 23:31:30 +00:00
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toggle = 0;
|
2018-08-28 13:49:42 +00:00
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break;
|
2014-04-03 23:31:30 +00:00
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}
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break;
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default:
|
2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6(6A) unsupported length\n");
|
2014-04-03 23:31:30 +00:00
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goto out;
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2010-04-08 23:04:40 +00:00
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}
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2014-04-03 23:31:30 +00:00
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2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6(6A) proto 0x%04x, scancode 0x%08x (toggle: %u)\n",
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protocol, scancode, toggle);
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2010-04-08 23:04:40 +00:00
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break;
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default:
|
2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6 unknown mode\n");
|
2010-04-08 23:04:40 +00:00
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goto out;
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}
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2014-04-03 23:31:30 +00:00
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rc_keydown(dev, protocol, scancode, toggle);
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2010-04-08 23:04:40 +00:00
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data->state = STATE_INACTIVE;
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return 0;
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}
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out:
|
2018-02-12 12:20:52 +00:00
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dev_dbg(&dev->dev, "RC6 decode failed at state %i (%uus %s)\n",
|
2020-08-23 17:23:05 +00:00
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data->state, ev.duration, TO_STR(ev.pulse));
|
2010-04-08 23:04:40 +00:00
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data->state = STATE_INACTIVE;
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return -EINVAL;
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}
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|
2015-03-31 17:48:09 +00:00
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|
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static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {
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{
|
2018-01-05 13:26:51 +00:00
|
|
|
.leader_pulse = RC6_PREFIX_PULSE,
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.leader_space = RC6_PREFIX_SPACE,
|
2015-03-31 17:48:09 +00:00
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.clock = RC6_UNIT,
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.invert = 1,
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},
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{
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.clock = RC6_UNIT * 2,
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.invert = 1,
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},
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{
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.clock = RC6_UNIT,
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.invert = 1,
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|
|
.trailer_space = RC6_SUFFIX_SPACE,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ir_rc6_encode() - Encode a scancode as a stream of raw events
|
|
|
|
*
|
|
|
|
* @protocol: protocol to encode
|
|
|
|
* @scancode: scancode to encode
|
|
|
|
* @events: array of raw ir events to write into
|
|
|
|
* @max: maximum size of @events
|
|
|
|
*
|
|
|
|
* Returns: The number of events written.
|
|
|
|
* -ENOBUFS if there isn't enough space in the array to fit the
|
|
|
|
* encoding. In this case all @max events will have been written.
|
|
|
|
* -EINVAL if the scancode is ambiguous or invalid.
|
|
|
|
*/
|
2017-08-07 20:20:58 +00:00
|
|
|
static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
|
2015-03-31 17:48:09 +00:00
|
|
|
struct ir_raw_event *events, unsigned int max)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct ir_raw_event *e = events;
|
|
|
|
|
2017-08-07 20:20:58 +00:00
|
|
|
if (protocol == RC_PROTO_RC6_0) {
|
2015-03-31 17:48:09 +00:00
|
|
|
/* Modulate the header (Start Bit & Mode-0) */
|
|
|
|
ret = ir_raw_gen_manchester(&e, max - (e - events),
|
2018-01-05 13:26:51 +00:00
|
|
|
&ir_rc6_timings[0],
|
2018-01-05 13:38:43 +00:00
|
|
|
RC6_HEADER_NBITS, (1 << 3));
|
2015-03-31 17:48:09 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Modulate Trailer Bit */
|
|
|
|
ret = ir_raw_gen_manchester(&e, max - (e - events),
|
2018-01-05 13:26:51 +00:00
|
|
|
&ir_rc6_timings[1], 1, 0);
|
2015-03-31 17:48:09 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Modulate rest of the data */
|
|
|
|
ret = ir_raw_gen_manchester(&e, max - (e - events),
|
2018-01-05 13:26:51 +00:00
|
|
|
&ir_rc6_timings[2], RC6_0_NBITS,
|
2015-03-31 17:48:09 +00:00
|
|
|
scancode);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
} else {
|
|
|
|
int bits;
|
|
|
|
|
|
|
|
switch (protocol) {
|
2017-08-07 20:20:58 +00:00
|
|
|
case RC_PROTO_RC6_MCE:
|
|
|
|
case RC_PROTO_RC6_6A_32:
|
2015-03-31 17:48:09 +00:00
|
|
|
bits = 32;
|
|
|
|
break;
|
2017-08-07 20:20:58 +00:00
|
|
|
case RC_PROTO_RC6_6A_24:
|
2015-03-31 17:48:09 +00:00
|
|
|
bits = 24;
|
|
|
|
break;
|
2017-08-07 20:20:58 +00:00
|
|
|
case RC_PROTO_RC6_6A_20:
|
2015-03-31 17:48:09 +00:00
|
|
|
bits = 20;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Modulate the header (Start Bit & Header-version 6 */
|
|
|
|
ret = ir_raw_gen_manchester(&e, max - (e - events),
|
2018-01-05 13:26:51 +00:00
|
|
|
&ir_rc6_timings[0],
|
2018-01-05 13:38:43 +00:00
|
|
|
RC6_HEADER_NBITS, (1 << 3 | 6));
|
2015-03-31 17:48:09 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Modulate Trailer Bit */
|
|
|
|
ret = ir_raw_gen_manchester(&e, max - (e - events),
|
2018-01-05 13:26:51 +00:00
|
|
|
&ir_rc6_timings[1], 1, 0);
|
2015-03-31 17:48:09 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Modulate rest of the data */
|
|
|
|
ret = ir_raw_gen_manchester(&e, max - (e - events),
|
2018-01-05 13:26:51 +00:00
|
|
|
&ir_rc6_timings[2],
|
2015-03-31 17:48:09 +00:00
|
|
|
bits,
|
|
|
|
scancode);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return e - events;
|
|
|
|
}
|
|
|
|
|
2010-04-08 23:04:40 +00:00
|
|
|
static struct ir_raw_handler rc6_handler = {
|
2017-08-07 20:20:58 +00:00
|
|
|
.protocols = RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 |
|
|
|
|
RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 |
|
|
|
|
RC_PROTO_BIT_RC6_MCE,
|
2010-04-08 23:04:40 +00:00
|
|
|
.decode = ir_rc6_decode,
|
2015-03-31 17:48:09 +00:00
|
|
|
.encode = ir_rc6_encode,
|
2017-02-25 11:51:30 +00:00
|
|
|
.carrier = 36000,
|
2018-03-23 20:47:37 +00:00
|
|
|
.min_timeout = RC6_SUFFIX_SPACE,
|
2010-04-08 23:04:40 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init ir_rc6_decode_init(void)
|
|
|
|
{
|
|
|
|
ir_raw_handler_register(&rc6_handler);
|
|
|
|
|
|
|
|
printk(KERN_INFO "IR RC6 protocol handler initialized\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit ir_rc6_decode_exit(void)
|
|
|
|
{
|
|
|
|
ir_raw_handler_unregister(&rc6_handler);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(ir_rc6_decode_init);
|
|
|
|
module_exit(ir_rc6_decode_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
|
|
|
|
MODULE_DESCRIPTION("RC6 IR protocol decoder");
|