mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
c003ab1bed
The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
200 lines
4.7 KiB
C
200 lines
4.7 KiB
C
/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol
|
|
*
|
|
* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/bitrev.h>
|
|
#include <linux/module.h>
|
|
#include "rc-core-priv.h"
|
|
|
|
#define JVC_NBITS 16 /* dev(8) + func(8) */
|
|
#define JVC_UNIT 525000 /* ns */
|
|
#define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */
|
|
#define JVC_HEADER_SPACE (8 * JVC_UNIT)
|
|
#define JVC_BIT_PULSE (1 * JVC_UNIT)
|
|
#define JVC_BIT_0_SPACE (1 * JVC_UNIT)
|
|
#define JVC_BIT_1_SPACE (3 * JVC_UNIT)
|
|
#define JVC_TRAILER_PULSE (1 * JVC_UNIT)
|
|
#define JVC_TRAILER_SPACE (35 * JVC_UNIT)
|
|
|
|
enum jvc_state {
|
|
STATE_INACTIVE,
|
|
STATE_HEADER_SPACE,
|
|
STATE_BIT_PULSE,
|
|
STATE_BIT_SPACE,
|
|
STATE_TRAILER_PULSE,
|
|
STATE_TRAILER_SPACE,
|
|
STATE_CHECK_REPEAT,
|
|
};
|
|
|
|
/**
|
|
* ir_jvc_decode() - Decode one JVC pulse or space
|
|
* @dev: the struct rc_dev descriptor of the device
|
|
* @duration: the struct ir_raw_event descriptor of the pulse/space
|
|
*
|
|
* This function returns -EINVAL if the pulse violates the state machine
|
|
*/
|
|
static int ir_jvc_decode(struct rc_dev *dev, struct ir_raw_event ev)
|
|
{
|
|
struct jvc_dec *data = &dev->raw->jvc;
|
|
|
|
if (!(dev->raw->enabled_protocols & RC_BIT_JVC))
|
|
return 0;
|
|
|
|
if (!is_timing_event(ev)) {
|
|
if (ev.reset)
|
|
data->state = STATE_INACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2))
|
|
goto out;
|
|
|
|
IR_dprintk(2, "JVC decode started at state %d (%uus %s)\n",
|
|
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
|
|
|
|
again:
|
|
switch (data->state) {
|
|
|
|
case STATE_INACTIVE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2))
|
|
break;
|
|
|
|
data->count = 0;
|
|
data->first = true;
|
|
data->toggle = !data->toggle;
|
|
data->state = STATE_HEADER_SPACE;
|
|
return 0;
|
|
|
|
case STATE_HEADER_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2))
|
|
break;
|
|
|
|
data->state = STATE_BIT_PULSE;
|
|
return 0;
|
|
|
|
case STATE_BIT_PULSE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2))
|
|
break;
|
|
|
|
data->state = STATE_BIT_SPACE;
|
|
return 0;
|
|
|
|
case STATE_BIT_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
data->bits <<= 1;
|
|
if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) {
|
|
data->bits |= 1;
|
|
decrease_duration(&ev, JVC_BIT_1_SPACE);
|
|
} else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2))
|
|
decrease_duration(&ev, JVC_BIT_0_SPACE);
|
|
else
|
|
break;
|
|
data->count++;
|
|
|
|
if (data->count == JVC_NBITS)
|
|
data->state = STATE_TRAILER_PULSE;
|
|
else
|
|
data->state = STATE_BIT_PULSE;
|
|
return 0;
|
|
|
|
case STATE_TRAILER_PULSE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, JVC_TRAILER_PULSE, JVC_UNIT / 2))
|
|
break;
|
|
|
|
data->state = STATE_TRAILER_SPACE;
|
|
return 0;
|
|
|
|
case STATE_TRAILER_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2))
|
|
break;
|
|
|
|
if (data->first) {
|
|
u32 scancode;
|
|
scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) |
|
|
(bitrev8((data->bits >> 0) & 0xff) << 0);
|
|
IR_dprintk(1, "JVC scancode 0x%04x\n", scancode);
|
|
rc_keydown(dev, scancode, data->toggle);
|
|
data->first = false;
|
|
data->old_bits = data->bits;
|
|
} else if (data->bits == data->old_bits) {
|
|
IR_dprintk(1, "JVC repeat\n");
|
|
rc_repeat(dev);
|
|
} else {
|
|
IR_dprintk(1, "JVC invalid repeat msg\n");
|
|
break;
|
|
}
|
|
|
|
data->count = 0;
|
|
data->state = STATE_CHECK_REPEAT;
|
|
return 0;
|
|
|
|
case STATE_CHECK_REPEAT:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2))
|
|
data->state = STATE_INACTIVE;
|
|
else
|
|
data->state = STATE_BIT_PULSE;
|
|
goto again;
|
|
}
|
|
|
|
out:
|
|
IR_dprintk(1, "JVC decode failed at state %d (%uus %s)\n",
|
|
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
|
|
data->state = STATE_INACTIVE;
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct ir_raw_handler jvc_handler = {
|
|
.protocols = RC_BIT_JVC,
|
|
.decode = ir_jvc_decode,
|
|
};
|
|
|
|
static int __init ir_jvc_decode_init(void)
|
|
{
|
|
ir_raw_handler_register(&jvc_handler);
|
|
|
|
printk(KERN_INFO "IR JVC protocol handler initialized\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ir_jvc_decode_exit(void)
|
|
{
|
|
ir_raw_handler_unregister(&jvc_handler);
|
|
}
|
|
|
|
module_init(ir_jvc_decode_init);
|
|
module_exit(ir_jvc_decode_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
|
|
MODULE_DESCRIPTION("JVC IR protocol decoder");
|