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![Heiner Kallweit](/assets/img/avatar_default.png)
Checking whether a protocol is enabled and calling the related decoder functions should be done by the rc core, not the protocol handlers. Properly handle lirc considering that no protocol bit is set for lirc. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
196 lines
4.6 KiB
C
196 lines
4.6 KiB
C
/* 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 525000 /* ns */
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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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* @duration: 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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IR_dprintk(2, "JVC decode started at state %d (%uus %s)\n",
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data->state, TO_US(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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IR_dprintk(1, "JVC scancode 0x%04x\n", scancode);
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rc_keydown(dev, RC_TYPE_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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IR_dprintk(1, "JVC repeat\n");
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rc_repeat(dev);
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} else {
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IR_dprintk(1, "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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IR_dprintk(1, "JVC decode failed at state %d (%uus %s)\n",
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data->state, TO_US(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 struct ir_raw_handler jvc_handler = {
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.protocols = RC_BIT_JVC,
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.decode = ir_jvc_decode,
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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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