linuxdebug/drivers/media/rc/ir-rc6-decoder.c

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2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/* ir-rc6-decoder.c - A decoder for the RC6 IR protocol
*
* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
*/
#include "rc-core-priv.h"
#include <linux/module.h>
/*
* This decoder currently supports:
* RC6-0-16 (standard toggle bit in header)
* RC6-6A-20 (no toggle bit)
* RC6-6A-24 (no toggle bit)
* RC6-6A-32 (MCE version with toggle bit in body)
*/
#define RC6_UNIT 444 /* microseconds */
#define RC6_HEADER_NBITS 4 /* not including toggle bit */
#define RC6_0_NBITS 16
#define RC6_6A_32_NBITS 32
#define RC6_6A_NBITS 128 /* Variable 8..128 */
#define RC6_PREFIX_PULSE (6 * RC6_UNIT)
#define RC6_PREFIX_SPACE (2 * RC6_UNIT)
#define RC6_BIT_START (1 * RC6_UNIT)
#define RC6_BIT_END (1 * RC6_UNIT)
#define RC6_TOGGLE_START (2 * RC6_UNIT)
#define RC6_TOGGLE_END (2 * RC6_UNIT)
#define RC6_SUFFIX_SPACE (6 * RC6_UNIT)
#define RC6_MODE_MASK 0x07 /* for the header bits */
#define RC6_STARTBIT_MASK 0x08 /* for the header bits */
#define RC6_6A_MCE_TOGGLE_MASK 0x8000 /* for the body bits */
#define RC6_6A_LCC_MASK 0xffff0000 /* RC6-6A-32 long customer code mask */
#define RC6_6A_MCE_CC 0x800f0000 /* MCE customer code */
#define RC6_6A_ZOTAC_CC 0x80340000 /* Zotac customer code */
#define RC6_6A_KATHREIN_CC 0x80460000 /* Kathrein RCU-676 customer code */
#ifndef CHAR_BIT
#define CHAR_BIT 8 /* Normally in <limits.h> */
#endif
enum rc6_mode {
RC6_MODE_0,
RC6_MODE_6A,
RC6_MODE_UNKNOWN,
};
enum rc6_state {
STATE_INACTIVE,
STATE_PREFIX_SPACE,
STATE_HEADER_BIT_START,
STATE_HEADER_BIT_END,
STATE_TOGGLE_START,
STATE_TOGGLE_END,
STATE_BODY_BIT_START,
STATE_BODY_BIT_END,
STATE_FINISHED,
};
static enum rc6_mode rc6_mode(struct rc6_dec *data)
{
switch (data->header & RC6_MODE_MASK) {
case 0:
return RC6_MODE_0;
case 6:
if (!data->toggle)
return RC6_MODE_6A;
fallthrough;
default:
return RC6_MODE_UNKNOWN;
}
}
/**
* ir_rc6_decode() - Decode one RC6 pulse or space
* @dev: the struct rc_dev descriptor of the device
* @ev: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the pulse violates the state machine
*/
static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
{
struct rc6_dec *data = &dev->raw->rc6;
u32 scancode;
u8 toggle;
enum rc_proto protocol;
if (!is_timing_event(ev)) {
if (ev.overflow)
data->state = STATE_INACTIVE;
return 0;
}
if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
goto out;
again:
dev_dbg(&dev->dev, "RC6 decode started at state %i (%uus %s)\n",
data->state, ev.duration, TO_STR(ev.pulse));
if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
return 0;
switch (data->state) {
case STATE_INACTIVE:
if (!ev.pulse)
break;
/* Note: larger margin on first pulse since each RC6_UNIT
is quite short and some hardware takes some time to
adjust to the signal */
if (!eq_margin(ev.duration, RC6_PREFIX_PULSE, RC6_UNIT))
break;
data->state = STATE_PREFIX_SPACE;
data->count = 0;
return 0;
case STATE_PREFIX_SPACE:
if (ev.pulse)
break;
if (!eq_margin(ev.duration, RC6_PREFIX_SPACE, RC6_UNIT / 2))
break;
data->state = STATE_HEADER_BIT_START;
data->header = 0;
return 0;
case STATE_HEADER_BIT_START:
if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
break;
data->header <<= 1;
if (ev.pulse)
data->header |= 1;
data->count++;
data->state = STATE_HEADER_BIT_END;
return 0;
case STATE_HEADER_BIT_END:
if (data->count == RC6_HEADER_NBITS)
data->state = STATE_TOGGLE_START;
else
data->state = STATE_HEADER_BIT_START;
decrease_duration(&ev, RC6_BIT_END);
goto again;
case STATE_TOGGLE_START:
if (!eq_margin(ev.duration, RC6_TOGGLE_START, RC6_UNIT / 2))
break;
data->toggle = ev.pulse;
data->state = STATE_TOGGLE_END;
return 0;
case STATE_TOGGLE_END:
if (!(data->header & RC6_STARTBIT_MASK)) {
dev_dbg(&dev->dev, "RC6 invalid start bit\n");
break;
}
data->state = STATE_BODY_BIT_START;
decrease_duration(&ev, RC6_TOGGLE_END);
data->count = 0;
data->body = 0;
switch (rc6_mode(data)) {
case RC6_MODE_0:
data->wanted_bits = RC6_0_NBITS;
break;
case RC6_MODE_6A:
data->wanted_bits = RC6_6A_NBITS;
break;
default:
dev_dbg(&dev->dev, "RC6 unknown mode\n");
goto out;
}
goto again;
case STATE_BODY_BIT_START:
if (eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2)) {
/* Discard LSB's that won't fit in data->body */
if (data->count++ < CHAR_BIT * sizeof data->body) {
data->body <<= 1;
if (ev.pulse)
data->body |= 1;
}
data->state = STATE_BODY_BIT_END;
return 0;
} else if (RC6_MODE_6A == rc6_mode(data) && !ev.pulse &&
geq_margin(ev.duration, RC6_SUFFIX_SPACE, RC6_UNIT / 2)) {
data->state = STATE_FINISHED;
goto again;
}
break;
case STATE_BODY_BIT_END:
if (data->count == data->wanted_bits)
data->state = STATE_FINISHED;
else
data->state = STATE_BODY_BIT_START;
decrease_duration(&ev, RC6_BIT_END);
goto again;
case STATE_FINISHED:
if (ev.pulse)
break;
switch (rc6_mode(data)) {
case RC6_MODE_0:
scancode = data->body;
toggle = data->toggle;
protocol = RC_PROTO_RC6_0;
dev_dbg(&dev->dev, "RC6(0) scancode 0x%04x (toggle: %u)\n",
scancode, toggle);
break;
case RC6_MODE_6A:
if (data->count > CHAR_BIT * sizeof data->body) {
dev_dbg(&dev->dev, "RC6 too many (%u) data bits\n",
data->count);
goto out;
}
scancode = data->body;
switch (data->count) {
case 20:
protocol = RC_PROTO_RC6_6A_20;
toggle = 0;
break;
case 24:
protocol = RC_PROTO_RC6_6A_24;
toggle = 0;
break;
case 32:
switch (scancode & RC6_6A_LCC_MASK) {
case RC6_6A_MCE_CC:
case RC6_6A_KATHREIN_CC:
case RC6_6A_ZOTAC_CC:
protocol = RC_PROTO_RC6_MCE;
toggle = !!(scancode & RC6_6A_MCE_TOGGLE_MASK);
scancode &= ~RC6_6A_MCE_TOGGLE_MASK;
break;
default:
protocol = RC_PROTO_RC6_6A_32;
toggle = 0;
break;
}
break;
default:
dev_dbg(&dev->dev, "RC6(6A) unsupported length\n");
goto out;
}
dev_dbg(&dev->dev, "RC6(6A) proto 0x%04x, scancode 0x%08x (toggle: %u)\n",
protocol, scancode, toggle);
break;
default:
dev_dbg(&dev->dev, "RC6 unknown mode\n");
goto out;
}
rc_keydown(dev, protocol, scancode, toggle);
data->state = STATE_INACTIVE;
return 0;
}
out:
dev_dbg(&dev->dev, "RC6 decode failed at state %i (%uus %s)\n",
data->state, ev.duration, TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}
static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {
{
.leader_pulse = RC6_PREFIX_PULSE,
.leader_space = RC6_PREFIX_SPACE,
.clock = RC6_UNIT,
.invert = 1,
},
{
.clock = RC6_UNIT * 2,
.invert = 1,
},
{
.clock = RC6_UNIT,
.invert = 1,
.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.
*/
static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max)
{
int ret;
struct ir_raw_event *e = events;
if (protocol == RC_PROTO_RC6_0) {
/* Modulate the header (Start Bit & Mode-0) */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[0],
RC6_HEADER_NBITS, (1 << 3));
if (ret < 0)
return ret;
/* Modulate Trailer Bit */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[1], 1, 0);
if (ret < 0)
return ret;
/* Modulate rest of the data */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[2], RC6_0_NBITS,
scancode);
if (ret < 0)
return ret;
} else {
int bits;
switch (protocol) {
case RC_PROTO_RC6_MCE:
case RC_PROTO_RC6_6A_32:
bits = 32;
break;
case RC_PROTO_RC6_6A_24:
bits = 24;
break;
case RC_PROTO_RC6_6A_20:
bits = 20;
break;
default:
return -EINVAL;
}
/* Modulate the header (Start Bit & Header-version 6 */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[0],
RC6_HEADER_NBITS, (1 << 3 | 6));
if (ret < 0)
return ret;
/* Modulate Trailer Bit */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[1], 1, 0);
if (ret < 0)
return ret;
/* Modulate rest of the data */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[2],
bits,
scancode);
if (ret < 0)
return ret;
}
return e - events;
}
static struct ir_raw_handler rc6_handler = {
.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,
.decode = ir_rc6_decode,
.encode = ir_rc6_encode,
.carrier = 36000,
.min_timeout = RC6_SUFFIX_SPACE,
};
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");