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.
229 lines
5.4 KiB
229 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol |
|
* |
|
* Copyright (C) 2010 by David Härdeman <[email protected]> |
|
*/ |
|
|
|
#include <linux/bitrev.h> |
|
#include <linux/module.h> |
|
#include "rc-core-priv.h" |
|
|
|
#define JVC_NBITS 16 /* dev(8) + func(8) */ |
|
#define JVC_UNIT 525 /* us */ |
|
#define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */ |
|
#define JVC_HEADER_SPACE (8 * JVC_UNIT) |
|
#define JVC_BIT_PULSE (1 * JVC_UNIT) |
|
#define JVC_BIT_0_SPACE (1 * JVC_UNIT) |
|
#define JVC_BIT_1_SPACE (3 * JVC_UNIT) |
|
#define JVC_TRAILER_PULSE (1 * JVC_UNIT) |
|
#define JVC_TRAILER_SPACE (35 * JVC_UNIT) |
|
|
|
enum jvc_state { |
|
STATE_INACTIVE, |
|
STATE_HEADER_SPACE, |
|
STATE_BIT_PULSE, |
|
STATE_BIT_SPACE, |
|
STATE_TRAILER_PULSE, |
|
STATE_TRAILER_SPACE, |
|
STATE_CHECK_REPEAT, |
|
}; |
|
|
|
/** |
|
* ir_jvc_decode() - Decode one JVC 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_jvc_decode(struct rc_dev *dev, struct ir_raw_event ev) |
|
{ |
|
struct jvc_dec *data = &dev->raw->jvc; |
|
|
|
if (!is_timing_event(ev)) { |
|
if (ev.reset) |
|
data->state = STATE_INACTIVE; |
|
return 0; |
|
} |
|
|
|
if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2)) |
|
goto out; |
|
|
|
dev_dbg(&dev->dev, "JVC decode started at state %d (%uus %s)\n", |
|
data->state, ev.duration, TO_STR(ev.pulse)); |
|
|
|
again: |
|
switch (data->state) { |
|
|
|
case STATE_INACTIVE: |
|
if (!ev.pulse) |
|
break; |
|
|
|
if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) |
|
break; |
|
|
|
data->count = 0; |
|
data->first = true; |
|
data->toggle = !data->toggle; |
|
data->state = STATE_HEADER_SPACE; |
|
return 0; |
|
|
|
case STATE_HEADER_SPACE: |
|
if (ev.pulse) |
|
break; |
|
|
|
if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2)) |
|
break; |
|
|
|
data->state = STATE_BIT_PULSE; |
|
return 0; |
|
|
|
case STATE_BIT_PULSE: |
|
if (!ev.pulse) |
|
break; |
|
|
|
if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2)) |
|
break; |
|
|
|
data->state = STATE_BIT_SPACE; |
|
return 0; |
|
|
|
case STATE_BIT_SPACE: |
|
if (ev.pulse) |
|
break; |
|
|
|
data->bits <<= 1; |
|
if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) { |
|
data->bits |= 1; |
|
decrease_duration(&ev, JVC_BIT_1_SPACE); |
|
} else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2)) |
|
decrease_duration(&ev, JVC_BIT_0_SPACE); |
|
else |
|
break; |
|
data->count++; |
|
|
|
if (data->count == JVC_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, JVC_TRAILER_PULSE, JVC_UNIT / 2)) |
|
break; |
|
|
|
data->state = STATE_TRAILER_SPACE; |
|
return 0; |
|
|
|
case STATE_TRAILER_SPACE: |
|
if (ev.pulse) |
|
break; |
|
|
|
if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2)) |
|
break; |
|
|
|
if (data->first) { |
|
u32 scancode; |
|
scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) | |
|
(bitrev8((data->bits >> 0) & 0xff) << 0); |
|
dev_dbg(&dev->dev, "JVC scancode 0x%04x\n", scancode); |
|
rc_keydown(dev, RC_PROTO_JVC, scancode, data->toggle); |
|
data->first = false; |
|
data->old_bits = data->bits; |
|
} else if (data->bits == data->old_bits) { |
|
dev_dbg(&dev->dev, "JVC repeat\n"); |
|
rc_repeat(dev); |
|
} else { |
|
dev_dbg(&dev->dev, "JVC invalid repeat msg\n"); |
|
break; |
|
} |
|
|
|
data->count = 0; |
|
data->state = STATE_CHECK_REPEAT; |
|
return 0; |
|
|
|
case STATE_CHECK_REPEAT: |
|
if (!ev.pulse) |
|
break; |
|
|
|
if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) |
|
data->state = STATE_INACTIVE; |
|
else |
|
data->state = STATE_BIT_PULSE; |
|
goto again; |
|
} |
|
|
|
out: |
|
dev_dbg(&dev->dev, "JVC decode failed at state %d (%uus %s)\n", |
|
data->state, ev.duration, TO_STR(ev.pulse)); |
|
data->state = STATE_INACTIVE; |
|
return -EINVAL; |
|
} |
|
|
|
static const struct ir_raw_timings_pd ir_jvc_timings = { |
|
.header_pulse = JVC_HEADER_PULSE, |
|
.header_space = JVC_HEADER_SPACE, |
|
.bit_pulse = JVC_BIT_PULSE, |
|
.bit_space[0] = JVC_BIT_0_SPACE, |
|
.bit_space[1] = JVC_BIT_1_SPACE, |
|
.trailer_pulse = JVC_TRAILER_PULSE, |
|
.trailer_space = JVC_TRAILER_SPACE, |
|
.msb_first = 1, |
|
}; |
|
|
|
/** |
|
* ir_jvc_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_jvc_encode(enum rc_proto protocol, u32 scancode, |
|
struct ir_raw_event *events, unsigned int max) |
|
{ |
|
struct ir_raw_event *e = events; |
|
int ret; |
|
u32 raw = (bitrev8((scancode >> 8) & 0xff) << 8) | |
|
(bitrev8((scancode >> 0) & 0xff) << 0); |
|
|
|
ret = ir_raw_gen_pd(&e, max, &ir_jvc_timings, JVC_NBITS, raw); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return e - events; |
|
} |
|
|
|
static struct ir_raw_handler jvc_handler = { |
|
.protocols = RC_PROTO_BIT_JVC, |
|
.decode = ir_jvc_decode, |
|
.encode = ir_jvc_encode, |
|
.carrier = 38000, |
|
.min_timeout = JVC_TRAILER_SPACE, |
|
}; |
|
|
|
static int __init ir_jvc_decode_init(void) |
|
{ |
|
ir_raw_handler_register(&jvc_handler); |
|
|
|
printk(KERN_INFO "IR JVC protocol handler initialized\n"); |
|
return 0; |
|
} |
|
|
|
static void __exit ir_jvc_decode_exit(void) |
|
{ |
|
ir_raw_handler_unregister(&jvc_handler); |
|
} |
|
|
|
module_init(ir_jvc_decode_init); |
|
module_exit(ir_jvc_decode_exit); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("David Härdeman <[email protected]>"); |
|
MODULE_DESCRIPTION("JVC IR protocol decoder");
|
|
|