![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>
209 lines
5.3 KiB
C
209 lines
5.3 KiB
C
/* ir-rc5-decoder.c - decoder for RC5(x) and StreamZap protocols
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*
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* Copyright (C) 2010 by Mauro Carvalho Chehab
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* Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
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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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/*
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* This decoder handles the 14 bit RC5 protocol, 15 bit "StreamZap" protocol
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* and 20 bit RC5x protocol.
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*/
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#include "rc-core-priv.h"
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#include <linux/module.h>
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#define RC5_NBITS 14
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#define RC5_SZ_NBITS 15
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#define RC5X_NBITS 20
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#define CHECK_RC5X_NBITS 8
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#define RC5_UNIT 888888 /* ns */
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#define RC5_BIT_START (1 * RC5_UNIT)
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#define RC5_BIT_END (1 * RC5_UNIT)
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#define RC5X_SPACE (4 * RC5_UNIT)
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#define RC5_TRAILER (10 * RC5_UNIT) /* In reality, approx 100 */
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enum rc5_state {
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STATE_INACTIVE,
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STATE_BIT_START,
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STATE_BIT_END,
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STATE_CHECK_RC5X,
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STATE_FINISHED,
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};
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/**
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* ir_rc5_decode() - Decode one RC-5 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_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct rc5_dec *data = &dev->raw->rc5;
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u8 toggle;
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u32 scancode;
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enum rc_type protocol;
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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, RC5_UNIT, RC5_UNIT / 2))
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goto out;
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again:
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IR_dprintk(2, "RC5(x/sz) decode started at state %i (%uus %s)\n",
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data->state, TO_US(ev.duration), TO_STR(ev.pulse));
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if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
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return 0;
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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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data->state = STATE_BIT_START;
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data->count = 1;
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decrease_duration(&ev, RC5_BIT_START);
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goto again;
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case STATE_BIT_START:
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if (!ev.pulse && geq_margin(ev.duration, RC5_TRAILER, RC5_UNIT / 2)) {
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data->state = STATE_FINISHED;
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goto again;
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}
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if (!eq_margin(ev.duration, RC5_BIT_START, RC5_UNIT / 2))
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break;
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data->bits <<= 1;
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if (!ev.pulse)
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data->bits |= 1;
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data->count++;
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data->state = STATE_BIT_END;
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return 0;
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case STATE_BIT_END:
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if (!is_transition(&ev, &dev->raw->prev_ev))
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break;
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if (data->count == CHECK_RC5X_NBITS)
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data->state = STATE_CHECK_RC5X;
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else
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data->state = STATE_BIT_START;
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decrease_duration(&ev, RC5_BIT_END);
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goto again;
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case STATE_CHECK_RC5X:
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if (!ev.pulse && geq_margin(ev.duration, RC5X_SPACE, RC5_UNIT / 2)) {
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data->is_rc5x = true;
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decrease_duration(&ev, RC5X_SPACE);
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} else
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data->is_rc5x = false;
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data->state = STATE_BIT_START;
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goto again;
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case STATE_FINISHED:
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if (ev.pulse)
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break;
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if (data->is_rc5x && data->count == RC5X_NBITS) {
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/* RC5X */
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u8 xdata, command, system;
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if (!(dev->enabled_protocols & RC_BIT_RC5X)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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xdata = (data->bits & 0x0003F) >> 0;
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command = (data->bits & 0x00FC0) >> 6;
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system = (data->bits & 0x1F000) >> 12;
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toggle = (data->bits & 0x20000) ? 1 : 0;
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command += (data->bits & 0x01000) ? 0 : 0x40;
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scancode = system << 16 | command << 8 | xdata;
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protocol = RC_TYPE_RC5X;
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} else if (!data->is_rc5x && data->count == RC5_NBITS) {
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/* RC5 */
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u8 command, system;
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if (!(dev->enabled_protocols & RC_BIT_RC5)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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command = (data->bits & 0x0003F) >> 0;
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system = (data->bits & 0x007C0) >> 6;
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toggle = (data->bits & 0x00800) ? 1 : 0;
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command += (data->bits & 0x01000) ? 0 : 0x40;
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scancode = system << 8 | command;
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protocol = RC_TYPE_RC5;
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} else if (!data->is_rc5x && data->count == RC5_SZ_NBITS) {
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/* RC5 StreamZap */
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u8 command, system;
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if (!(dev->enabled_protocols & RC_BIT_RC5_SZ)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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command = (data->bits & 0x0003F) >> 0;
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system = (data->bits & 0x02FC0) >> 6;
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toggle = (data->bits & 0x01000) ? 1 : 0;
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scancode = system << 6 | command;
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protocol = RC_TYPE_RC5_SZ;
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} else
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break;
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IR_dprintk(1, "RC5(x/sz) scancode 0x%06x (p: %u, t: %u)\n",
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scancode, protocol, toggle);
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rc_keydown(dev, protocol, scancode, toggle);
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data->state = STATE_INACTIVE;
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return 0;
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}
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out:
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IR_dprintk(1, "RC5(x/sz) decode failed at state %i count %d (%uus %s)\n",
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data->state, data->count, 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 rc5_handler = {
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.protocols = RC_BIT_RC5 | RC_BIT_RC5X | RC_BIT_RC5_SZ,
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.decode = ir_rc5_decode,
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};
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static int __init ir_rc5_decode_init(void)
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{
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ir_raw_handler_register(&rc5_handler);
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printk(KERN_INFO "IR RC5(x/sz) protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_rc5_decode_exit(void)
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{
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ir_raw_handler_unregister(&rc5_handler);
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}
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module_init(ir_rc5_decode_init);
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module_exit(ir_rc5_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mauro Carvalho Chehab and Jarod Wilson");
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MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
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MODULE_DESCRIPTION("RC5(x/sz) IR protocol decoder");
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