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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>
195 lines
4.8 KiB
C
195 lines
4.8 KiB
C
/* ir-sony-decoder.c - handle Sony 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 SONY_UNIT 600000 /* ns */
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#define SONY_HEADER_PULSE (4 * SONY_UNIT)
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#define SONY_HEADER_SPACE (1 * SONY_UNIT)
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#define SONY_BIT_0_PULSE (1 * SONY_UNIT)
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#define SONY_BIT_1_PULSE (2 * SONY_UNIT)
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#define SONY_BIT_SPACE (1 * SONY_UNIT)
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#define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */
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enum sony_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_FINISHED,
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};
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/**
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* ir_sony_decode() - Decode one Sony 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_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
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{
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struct sony_dec *data = &dev->raw->sony;
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enum rc_type protocol;
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u32 scancode;
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u8 device, subdevice, function;
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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, SONY_UNIT, SONY_UNIT / 2))
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goto out;
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IR_dprintk(2, "Sony 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, SONY_HEADER_PULSE, SONY_UNIT / 2))
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break;
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data->count = 0;
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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, SONY_HEADER_SPACE, SONY_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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data->bits <<= 1;
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if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
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data->bits |= 1;
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else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
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break;
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data->count++;
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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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if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
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break;
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decrease_duration(&ev, SONY_BIT_SPACE);
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if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
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data->state = STATE_BIT_PULSE;
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return 0;
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}
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data->state = STATE_FINISHED;
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/* Fall through */
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case STATE_FINISHED:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
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break;
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switch (data->count) {
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case 12:
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if (!(dev->enabled_protocols & RC_BIT_SONY12))
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goto finish_state_machine;
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device = bitrev8((data->bits << 3) & 0xF8);
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subdevice = 0;
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function = bitrev8((data->bits >> 4) & 0xFE);
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protocol = RC_TYPE_SONY12;
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break;
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case 15:
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if (!(dev->enabled_protocols & RC_BIT_SONY15))
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goto finish_state_machine;
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device = bitrev8((data->bits >> 0) & 0xFF);
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subdevice = 0;
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function = bitrev8((data->bits >> 7) & 0xFE);
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protocol = RC_TYPE_SONY15;
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break;
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case 20:
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if (!(dev->enabled_protocols & RC_BIT_SONY20))
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goto finish_state_machine;
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device = bitrev8((data->bits >> 5) & 0xF8);
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subdevice = bitrev8((data->bits >> 0) & 0xFF);
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function = bitrev8((data->bits >> 12) & 0xFE);
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protocol = RC_TYPE_SONY20;
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break;
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default:
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IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
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goto out;
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}
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scancode = device << 16 | subdevice << 8 | function;
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IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
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rc_keydown(dev, protocol, scancode, 0);
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goto finish_state_machine;
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}
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out:
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IR_dprintk(1, "Sony 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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finish_state_machine:
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data->state = STATE_INACTIVE;
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return 0;
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}
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static struct ir_raw_handler sony_handler = {
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.protocols = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
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.decode = ir_sony_decode,
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};
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static int __init ir_sony_decode_init(void)
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{
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ir_raw_handler_register(&sony_handler);
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printk(KERN_INFO "IR Sony protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_sony_decode_exit(void)
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{
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ir_raw_handler_unregister(&sony_handler);
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}
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module_init(ir_sony_decode_init);
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module_exit(ir_sony_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("Sony IR protocol decoder");
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