236 lines
6 KiB
C
236 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// ir-sanyo-decoder.c - handle SANYO IR Pulse/Space protocol
|
|
//
|
|
// Copyright (C) 2011 by Mauro Carvalho Chehab
|
|
//
|
|
// This protocol uses the NEC protocol timings. However, data is formatted as:
|
|
// 13 bits Custom Code
|
|
// 13 bits NOT(Custom Code)
|
|
// 8 bits Key data
|
|
// 8 bits NOT(Key data)
|
|
//
|
|
// According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon
|
|
// Information for this protocol is available at the Sanyo LC7461 datasheet.
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/bitrev.h>
|
|
#include "rc-core-priv.h"
|
|
|
|
#define SANYO_NBITS (13+13+8+8)
|
|
#define SANYO_UNIT 562500 /* ns */
|
|
#define SANYO_HEADER_PULSE (16 * SANYO_UNIT)
|
|
#define SANYO_HEADER_SPACE (8 * SANYO_UNIT)
|
|
#define SANYO_BIT_PULSE (1 * SANYO_UNIT)
|
|
#define SANYO_BIT_0_SPACE (1 * SANYO_UNIT)
|
|
#define SANYO_BIT_1_SPACE (3 * SANYO_UNIT)
|
|
#define SANYO_REPEAT_SPACE (150 * SANYO_UNIT)
|
|
#define SANYO_TRAILER_PULSE (1 * SANYO_UNIT)
|
|
#define SANYO_TRAILER_SPACE (10 * SANYO_UNIT) /* in fact, 42 */
|
|
|
|
enum sanyo_state {
|
|
STATE_INACTIVE,
|
|
STATE_HEADER_SPACE,
|
|
STATE_BIT_PULSE,
|
|
STATE_BIT_SPACE,
|
|
STATE_TRAILER_PULSE,
|
|
STATE_TRAILER_SPACE,
|
|
};
|
|
|
|
/**
|
|
* ir_sanyo_decode() - Decode one SANYO 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_sanyo_decode(struct rc_dev *dev, struct ir_raw_event ev)
|
|
{
|
|
struct sanyo_dec *data = &dev->raw->sanyo;
|
|
u32 scancode;
|
|
u16 address;
|
|
u8 command, not_command;
|
|
|
|
if (!is_timing_event(ev)) {
|
|
if (ev.reset) {
|
|
dev_dbg(&dev->dev, "SANYO event reset received. reset to state 0\n");
|
|
data->state = STATE_INACTIVE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "SANYO decode started at state %d (%uus %s)\n",
|
|
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
|
|
|
|
switch (data->state) {
|
|
|
|
case STATE_INACTIVE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (eq_margin(ev.duration, SANYO_HEADER_PULSE, SANYO_UNIT / 2)) {
|
|
data->count = 0;
|
|
data->state = STATE_HEADER_SPACE;
|
|
return 0;
|
|
}
|
|
break;
|
|
|
|
|
|
case STATE_HEADER_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (eq_margin(ev.duration, SANYO_HEADER_SPACE, SANYO_UNIT / 2)) {
|
|
data->state = STATE_BIT_PULSE;
|
|
return 0;
|
|
}
|
|
|
|
break;
|
|
|
|
case STATE_BIT_PULSE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, SANYO_BIT_PULSE, SANYO_UNIT / 2))
|
|
break;
|
|
|
|
data->state = STATE_BIT_SPACE;
|
|
return 0;
|
|
|
|
case STATE_BIT_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!data->count && geq_margin(ev.duration, SANYO_REPEAT_SPACE, SANYO_UNIT / 2)) {
|
|
rc_repeat(dev);
|
|
dev_dbg(&dev->dev, "SANYO repeat last key\n");
|
|
data->state = STATE_INACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
data->bits <<= 1;
|
|
if (eq_margin(ev.duration, SANYO_BIT_1_SPACE, SANYO_UNIT / 2))
|
|
data->bits |= 1;
|
|
else if (!eq_margin(ev.duration, SANYO_BIT_0_SPACE, SANYO_UNIT / 2))
|
|
break;
|
|
data->count++;
|
|
|
|
if (data->count == SANYO_NBITS)
|
|
data->state = STATE_TRAILER_PULSE;
|
|
else
|
|
data->state = STATE_BIT_PULSE;
|
|
|
|
return 0;
|
|
|
|
case STATE_TRAILER_PULSE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, SANYO_TRAILER_PULSE, SANYO_UNIT / 2))
|
|
break;
|
|
|
|
data->state = STATE_TRAILER_SPACE;
|
|
return 0;
|
|
|
|
case STATE_TRAILER_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!geq_margin(ev.duration, SANYO_TRAILER_SPACE, SANYO_UNIT / 2))
|
|
break;
|
|
|
|
address = bitrev16((data->bits >> 29) & 0x1fff) >> 3;
|
|
/* not_address = bitrev16((data->bits >> 16) & 0x1fff) >> 3; */
|
|
command = bitrev8((data->bits >> 8) & 0xff);
|
|
not_command = bitrev8((data->bits >> 0) & 0xff);
|
|
|
|
if ((command ^ not_command) != 0xff) {
|
|
dev_dbg(&dev->dev, "SANYO checksum error: received 0x%08llx\n",
|
|
data->bits);
|
|
data->state = STATE_INACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
scancode = address << 8 | command;
|
|
dev_dbg(&dev->dev, "SANYO scancode: 0x%06x\n", scancode);
|
|
rc_keydown(dev, RC_PROTO_SANYO, scancode, 0);
|
|
data->state = STATE_INACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "SANYO decode failed at count %d state %d (%uus %s)\n",
|
|
data->count, data->state, TO_US(ev.duration), TO_STR(ev.pulse));
|
|
data->state = STATE_INACTIVE;
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct ir_raw_timings_pd ir_sanyo_timings = {
|
|
.header_pulse = SANYO_HEADER_PULSE,
|
|
.header_space = SANYO_HEADER_SPACE,
|
|
.bit_pulse = SANYO_BIT_PULSE,
|
|
.bit_space[0] = SANYO_BIT_0_SPACE,
|
|
.bit_space[1] = SANYO_BIT_1_SPACE,
|
|
.trailer_pulse = SANYO_TRAILER_PULSE,
|
|
.trailer_space = SANYO_TRAILER_SPACE,
|
|
.msb_first = 1,
|
|
};
|
|
|
|
/**
|
|
* ir_sanyo_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.
|
|
*/
|
|
static int ir_sanyo_encode(enum rc_proto protocol, u32 scancode,
|
|
struct ir_raw_event *events, unsigned int max)
|
|
{
|
|
struct ir_raw_event *e = events;
|
|
int ret;
|
|
u64 raw;
|
|
|
|
raw = ((u64)(bitrev16(scancode >> 8) & 0xfff8) << (8 + 8 + 13 - 3)) |
|
|
((u64)(bitrev16(~scancode >> 8) & 0xfff8) << (8 + 8 + 0 - 3)) |
|
|
((bitrev8(scancode) & 0xff) << 8) |
|
|
(bitrev8(~scancode) & 0xff);
|
|
|
|
ret = ir_raw_gen_pd(&e, max, &ir_sanyo_timings, SANYO_NBITS, raw);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return e - events;
|
|
}
|
|
|
|
static struct ir_raw_handler sanyo_handler = {
|
|
.protocols = RC_PROTO_BIT_SANYO,
|
|
.decode = ir_sanyo_decode,
|
|
.encode = ir_sanyo_encode,
|
|
.carrier = 38000,
|
|
.min_timeout = SANYO_TRAILER_SPACE,
|
|
};
|
|
|
|
static int __init ir_sanyo_decode_init(void)
|
|
{
|
|
ir_raw_handler_register(&sanyo_handler);
|
|
|
|
printk(KERN_INFO "IR SANYO protocol handler initialized\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ir_sanyo_decode_exit(void)
|
|
{
|
|
ir_raw_handler_unregister(&sanyo_handler);
|
|
}
|
|
|
|
module_init(ir_sanyo_decode_init);
|
|
module_exit(ir_sanyo_decode_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Mauro Carvalho Chehab");
|
|
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
|
|
MODULE_DESCRIPTION("SANYO IR protocol decoder");
|