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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>
199 lines
4.8 KiB
C
199 lines
4.8 KiB
C
/* ir-sharp-decoder.c - handle Sharp IR Pulse/Space protocol
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*
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* Copyright (C) 2013-2014 Imagination Technologies Ltd.
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*
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* Based on NEC decoder:
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* Copyright (C) 2010 by Mauro Carvalho Chehab
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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 SHARP_NBITS 15
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#define SHARP_UNIT 40000 /* ns */
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#define SHARP_BIT_PULSE (8 * SHARP_UNIT) /* 320us */
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#define SHARP_BIT_0_PERIOD (25 * SHARP_UNIT) /* 1ms (680us space) */
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#define SHARP_BIT_1_PERIOD (50 * SHARP_UNIT) /* 2ms (1680ms space) */
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#define SHARP_ECHO_SPACE (1000 * SHARP_UNIT) /* 40 ms */
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#define SHARP_TRAILER_SPACE (125 * SHARP_UNIT) /* 5 ms (even longer) */
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enum sharp_state {
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STATE_INACTIVE,
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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_ECHO_SPACE,
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STATE_TRAILER_SPACE,
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};
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/**
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* ir_sharp_decode() - Decode one Sharp 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_sharp_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct sharp_dec *data = &dev->raw->sharp;
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u32 msg, echo, address, command, scancode;
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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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IR_dprintk(2, "Sharp 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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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, SHARP_BIT_PULSE,
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SHARP_BIT_PULSE / 2))
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break;
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data->count = 0;
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data->pulse_len = ev.duration;
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data->state = STATE_BIT_SPACE;
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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, SHARP_BIT_PULSE,
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SHARP_BIT_PULSE / 2))
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break;
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data->pulse_len = ev.duration;
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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(data->pulse_len + ev.duration, SHARP_BIT_1_PERIOD,
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SHARP_BIT_PULSE * 2))
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data->bits |= 1;
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else if (!eq_margin(data->pulse_len + ev.duration,
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SHARP_BIT_0_PERIOD, SHARP_BIT_PULSE * 2))
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break;
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data->count++;
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if (data->count == SHARP_NBITS ||
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data->count == SHARP_NBITS * 2)
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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, SHARP_BIT_PULSE,
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SHARP_BIT_PULSE / 2))
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break;
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if (data->count == SHARP_NBITS) {
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/* exp,chk bits should be 1,0 */
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if ((data->bits & 0x3) != 0x2 &&
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/* DENON variant, both chk bits 0 */
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(data->bits & 0x3) != 0x0)
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break;
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data->state = STATE_ECHO_SPACE;
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} else {
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data->state = STATE_TRAILER_SPACE;
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}
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return 0;
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case STATE_ECHO_SPACE:
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if (ev.pulse)
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break;
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if (!eq_margin(ev.duration, SHARP_ECHO_SPACE,
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SHARP_ECHO_SPACE / 4))
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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_TRAILER_SPACE:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SHARP_TRAILER_SPACE,
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SHARP_BIT_PULSE / 2))
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break;
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/* Validate - command, ext, chk should be inverted in 2nd */
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msg = (data->bits >> 15) & 0x7fff;
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echo = data->bits & 0x7fff;
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if ((msg ^ echo) != 0x3ff) {
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IR_dprintk(1,
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"Sharp checksum error: received 0x%04x, 0x%04x\n",
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msg, echo);
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break;
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}
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address = bitrev8((msg >> 7) & 0xf8);
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command = bitrev8((msg >> 2) & 0xff);
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scancode = address << 8 | command;
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IR_dprintk(1, "Sharp scancode 0x%04x\n", scancode);
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rc_keydown(dev, RC_TYPE_SHARP, scancode, 0);
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data->state = STATE_INACTIVE;
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return 0;
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}
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IR_dprintk(1, "Sharp decode failed at count %d state %d (%uus %s)\n",
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data->count, data->state, TO_US(ev.duration),
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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 sharp_handler = {
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.protocols = RC_BIT_SHARP,
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.decode = ir_sharp_decode,
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};
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static int __init ir_sharp_decode_init(void)
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{
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ir_raw_handler_register(&sharp_handler);
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pr_info("IR Sharp protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_sharp_decode_exit(void)
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{
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ir_raw_handler_unregister(&sharp_handler);
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}
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module_init(ir_sharp_decode_init);
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module_exit(ir_sharp_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("James Hogan <james.hogan@imgtec.com>");
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MODULE_DESCRIPTION("Sharp IR protocol decoder");
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