Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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// SPDX-License-Identifier: GPL-2.0-only
/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol
*
* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
*/
#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 <david@hardeman.nu>");
MODULE_DESCRIPTION("JVC IR protocol decoder");