forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
235 lines
6.0 KiB
235 lines
6.0 KiB
// 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 563 /* us */ |
|
#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, 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, 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");
|
|
|