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528222d853
rc-core kapi uses nanoseconds for infrared durations for receiving, and microseconds for sending. The uapi already uses microseconds for both, so this patch does not change the uapi. Infrared durations do not need nanosecond resolution. IR protocols do not have durations shorter than about 100 microseconds. Some IR hardware offers 250 microseconds resolution, which is sufficient for most protocols. Better hardware has 50 microsecond resolution and is enough for every protocol I am aware off. Unify on microseconds everywhere. This simplifies the code since less conversion between microseconds and nanoseconds needs to be done. This affects: - rx_resolution member of struct rc_dev - timeout member of struct rc_dev - duration member in struct ir_raw_event Cc: "Bruno Prémont" <bonbons@linux-vserver.org> Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Patrick Lerda <patrick9876@free.fr> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Cc: Jerome Brunet <jbrunet@baylibre.com> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Sean Wang <sean.wang@mediatek.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Chen-Yu Tsai <wens@csie.org> Cc: "David Härdeman" <david@hardeman.nu> Cc: Benjamin Valentin <benpicco@googlemail.com> Cc: Antti Palosaari <crope@iki.fi> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
230 lines
5.4 KiB
C
230 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* ir-jvc-decoder.c - handle JVC IR Pulse/Space 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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#include <linux/bitrev.h>
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#include <linux/module.h>
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#include "rc-core-priv.h"
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#define JVC_NBITS 16 /* dev(8) + func(8) */
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#define JVC_UNIT 525 /* us */
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#define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */
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#define JVC_HEADER_SPACE (8 * JVC_UNIT)
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#define JVC_BIT_PULSE (1 * JVC_UNIT)
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#define JVC_BIT_0_SPACE (1 * JVC_UNIT)
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#define JVC_BIT_1_SPACE (3 * JVC_UNIT)
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#define JVC_TRAILER_PULSE (1 * JVC_UNIT)
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#define JVC_TRAILER_SPACE (35 * JVC_UNIT)
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enum jvc_state {
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STATE_INACTIVE,
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STATE_HEADER_SPACE,
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STATE_BIT_PULSE,
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STATE_BIT_SPACE,
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STATE_TRAILER_PULSE,
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STATE_TRAILER_SPACE,
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STATE_CHECK_REPEAT,
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};
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/**
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* ir_jvc_decode() - Decode one JVC pulse or space
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* @dev: the struct rc_dev descriptor of the device
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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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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static int ir_jvc_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct jvc_dec *data = &dev->raw->jvc;
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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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return 0;
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}
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if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2))
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goto out;
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dev_dbg(&dev->dev, "JVC decode started at state %d (%uus %s)\n",
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data->state, ev.duration, TO_STR(ev.pulse));
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again:
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switch (data->state) {
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case STATE_INACTIVE:
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if (!ev.pulse)
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break;
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if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2))
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break;
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data->count = 0;
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data->first = true;
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data->toggle = !data->toggle;
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data->state = STATE_HEADER_SPACE;
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return 0;
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case STATE_HEADER_SPACE:
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if (ev.pulse)
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break;
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if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2))
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break;
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data->state = STATE_BIT_PULSE;
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return 0;
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case STATE_BIT_PULSE:
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if (!ev.pulse)
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break;
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if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2))
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break;
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data->state = STATE_BIT_SPACE;
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return 0;
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case STATE_BIT_SPACE:
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if (ev.pulse)
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break;
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data->bits <<= 1;
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if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) {
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data->bits |= 1;
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decrease_duration(&ev, JVC_BIT_1_SPACE);
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} else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2))
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decrease_duration(&ev, JVC_BIT_0_SPACE);
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else
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break;
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data->count++;
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if (data->count == JVC_NBITS)
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data->state = STATE_TRAILER_PULSE;
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else
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data->state = STATE_BIT_PULSE;
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return 0;
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case STATE_TRAILER_PULSE:
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if (!ev.pulse)
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break;
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if (!eq_margin(ev.duration, JVC_TRAILER_PULSE, JVC_UNIT / 2))
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break;
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data->state = STATE_TRAILER_SPACE;
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return 0;
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case STATE_TRAILER_SPACE:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2))
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break;
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if (data->first) {
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u32 scancode;
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scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) |
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(bitrev8((data->bits >> 0) & 0xff) << 0);
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dev_dbg(&dev->dev, "JVC scancode 0x%04x\n", scancode);
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rc_keydown(dev, RC_PROTO_JVC, scancode, data->toggle);
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data->first = false;
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data->old_bits = data->bits;
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} else if (data->bits == data->old_bits) {
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dev_dbg(&dev->dev, "JVC repeat\n");
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rc_repeat(dev);
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} else {
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dev_dbg(&dev->dev, "JVC invalid repeat msg\n");
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break;
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}
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data->count = 0;
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data->state = STATE_CHECK_REPEAT;
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return 0;
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case STATE_CHECK_REPEAT:
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if (!ev.pulse)
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break;
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if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2))
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data->state = STATE_INACTIVE;
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else
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data->state = STATE_BIT_PULSE;
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goto again;
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}
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out:
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dev_dbg(&dev->dev, "JVC decode failed at state %d (%uus %s)\n",
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data->state, ev.duration, TO_STR(ev.pulse));
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data->state = STATE_INACTIVE;
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return -EINVAL;
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}
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static const struct ir_raw_timings_pd ir_jvc_timings = {
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.header_pulse = JVC_HEADER_PULSE,
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.header_space = JVC_HEADER_SPACE,
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.bit_pulse = JVC_BIT_PULSE,
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.bit_space[0] = JVC_BIT_0_SPACE,
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.bit_space[1] = JVC_BIT_1_SPACE,
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.trailer_pulse = JVC_TRAILER_PULSE,
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.trailer_space = JVC_TRAILER_SPACE,
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.msb_first = 1,
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};
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/**
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* ir_jvc_encode() - Encode a scancode as a stream of raw events
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*
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* @protocol: protocol to encode
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* @scancode: scancode to encode
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* @events: array of raw ir events to write into
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* @max: maximum size of @events
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*
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* Returns: The number of events written.
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* -ENOBUFS if there isn't enough space in the array to fit the
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* encoding. In this case all @max events will have been written.
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*/
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static int ir_jvc_encode(enum rc_proto protocol, u32 scancode,
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struct ir_raw_event *events, unsigned int max)
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{
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struct ir_raw_event *e = events;
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int ret;
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u32 raw = (bitrev8((scancode >> 8) & 0xff) << 8) |
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(bitrev8((scancode >> 0) & 0xff) << 0);
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ret = ir_raw_gen_pd(&e, max, &ir_jvc_timings, JVC_NBITS, raw);
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if (ret < 0)
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return ret;
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return e - events;
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}
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static struct ir_raw_handler jvc_handler = {
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.protocols = RC_PROTO_BIT_JVC,
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.decode = ir_jvc_decode,
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.encode = ir_jvc_encode,
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.carrier = 38000,
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.min_timeout = JVC_TRAILER_SPACE,
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};
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static int __init ir_jvc_decode_init(void)
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{
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ir_raw_handler_register(&jvc_handler);
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printk(KERN_INFO "IR JVC protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_jvc_decode_exit(void)
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{
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ir_raw_handler_unregister(&jvc_handler);
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}
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module_init(ir_jvc_decode_init);
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module_exit(ir_jvc_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
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MODULE_DESCRIPTION("JVC IR protocol decoder");
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