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37e59f876b
There are several left overs with my old email address. Remove their occurrences and add myself at CREDITS, to allow people to be able to reach me on my new addresses. Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/* ir-rc5-sz-decoder.c - handle RC5 Streamzap IR Pulse/Space protocol
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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 code handles the 15 bit RC5-ish protocol used by the Streamzap
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* PC Remote.
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* It considers a carrier of 36 kHz, with a total of 15 bits, where
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* the first two bits are start bits, and a third one is a filing bit
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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_SZ_NBITS 15
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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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enum rc5_sz_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_FINISHED,
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};
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/**
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* ir_rc5_sz_decode() - Decode one RC-5 Streamzap 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_sz_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct rc5_sz_dec *data = &dev->raw->rc5_sz;
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u8 toggle, command, system;
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u32 scancode;
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if (!(dev->enabled_protocols & RC_BIT_RC5_SZ))
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return 0;
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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-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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data->wanted_bits = RC5_SZ_NBITS;
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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 (!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 == data->wanted_bits)
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data->state = STATE_FINISHED;
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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_FINISHED:
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if (ev.pulse)
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break;
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/* RC5-sz */
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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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IR_dprintk(1, "RC5-sz scancode 0x%04x (toggle: %u)\n",
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scancode, toggle);
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rc_keydown(dev, 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-sz decode failed at state %i (%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 rc5_sz_handler = {
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.protocols = RC_BIT_RC5_SZ,
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.decode = ir_rc5_sz_decode,
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};
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static int __init ir_rc5_sz_decode_init(void)
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{
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ir_raw_handler_register(&rc5_sz_handler);
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printk(KERN_INFO "IR RC5 (streamzap) protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_rc5_sz_decode_exit(void)
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{
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ir_raw_handler_unregister(&rc5_sz_handler);
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}
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module_init(ir_rc5_sz_decode_init);
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module_exit(ir_rc5_sz_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
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MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
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MODULE_DESCRIPTION("RC5 (streamzap) IR protocol decoder");
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