![Sean Young](/assets/img/avatar_default.png)
Add the capability to encode Sony scancodes as raw events. Sony uses pulse length rather than pulse distance. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
244 lines
6.1 KiB
C
244 lines
6.1 KiB
C
/* ir-sony-decoder.c - handle Sony 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 SONY_UNIT 600000 /* ns */
|
|
#define SONY_HEADER_PULSE (4 * SONY_UNIT)
|
|
#define SONY_HEADER_SPACE (1 * SONY_UNIT)
|
|
#define SONY_BIT_0_PULSE (1 * SONY_UNIT)
|
|
#define SONY_BIT_1_PULSE (2 * SONY_UNIT)
|
|
#define SONY_BIT_SPACE (1 * SONY_UNIT)
|
|
#define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */
|
|
|
|
enum sony_state {
|
|
STATE_INACTIVE,
|
|
STATE_HEADER_SPACE,
|
|
STATE_BIT_PULSE,
|
|
STATE_BIT_SPACE,
|
|
STATE_FINISHED,
|
|
};
|
|
|
|
/**
|
|
* ir_sony_decode() - Decode one Sony pulse or space
|
|
* @dev: the struct rc_dev descriptor of the device
|
|
* @ev: the struct ir_raw_event descriptor of the pulse/space
|
|
*
|
|
* This function returns -EINVAL if the pulse violates the state machine
|
|
*/
|
|
static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
|
|
{
|
|
struct sony_dec *data = &dev->raw->sony;
|
|
enum rc_type protocol;
|
|
u32 scancode;
|
|
u8 device, subdevice, function;
|
|
|
|
if (!is_timing_event(ev)) {
|
|
if (ev.reset)
|
|
data->state = STATE_INACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2))
|
|
goto out;
|
|
|
|
IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n",
|
|
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
|
|
|
|
switch (data->state) {
|
|
|
|
case STATE_INACTIVE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2))
|
|
break;
|
|
|
|
data->count = 0;
|
|
data->state = STATE_HEADER_SPACE;
|
|
return 0;
|
|
|
|
case STATE_HEADER_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2))
|
|
break;
|
|
|
|
data->state = STATE_BIT_PULSE;
|
|
return 0;
|
|
|
|
case STATE_BIT_PULSE:
|
|
if (!ev.pulse)
|
|
break;
|
|
|
|
data->bits <<= 1;
|
|
if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
|
|
data->bits |= 1;
|
|
else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
|
|
break;
|
|
|
|
data->count++;
|
|
data->state = STATE_BIT_SPACE;
|
|
return 0;
|
|
|
|
case STATE_BIT_SPACE:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
|
|
break;
|
|
|
|
decrease_duration(&ev, SONY_BIT_SPACE);
|
|
|
|
if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
|
|
data->state = STATE_BIT_PULSE;
|
|
return 0;
|
|
}
|
|
|
|
data->state = STATE_FINISHED;
|
|
/* Fall through */
|
|
|
|
case STATE_FINISHED:
|
|
if (ev.pulse)
|
|
break;
|
|
|
|
if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
|
|
break;
|
|
|
|
switch (data->count) {
|
|
case 12:
|
|
if (!(dev->enabled_protocols & RC_BIT_SONY12))
|
|
goto finish_state_machine;
|
|
|
|
device = bitrev8((data->bits << 3) & 0xF8);
|
|
subdevice = 0;
|
|
function = bitrev8((data->bits >> 4) & 0xFE);
|
|
protocol = RC_TYPE_SONY12;
|
|
break;
|
|
case 15:
|
|
if (!(dev->enabled_protocols & RC_BIT_SONY15))
|
|
goto finish_state_machine;
|
|
|
|
device = bitrev8((data->bits >> 0) & 0xFF);
|
|
subdevice = 0;
|
|
function = bitrev8((data->bits >> 7) & 0xFE);
|
|
protocol = RC_TYPE_SONY15;
|
|
break;
|
|
case 20:
|
|
if (!(dev->enabled_protocols & RC_BIT_SONY20))
|
|
goto finish_state_machine;
|
|
|
|
device = bitrev8((data->bits >> 5) & 0xF8);
|
|
subdevice = bitrev8((data->bits >> 0) & 0xFF);
|
|
function = bitrev8((data->bits >> 12) & 0xFE);
|
|
protocol = RC_TYPE_SONY20;
|
|
break;
|
|
default:
|
|
IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
|
|
goto out;
|
|
}
|
|
|
|
scancode = device << 16 | subdevice << 8 | function;
|
|
IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
|
|
rc_keydown(dev, protocol, scancode, 0);
|
|
goto finish_state_machine;
|
|
}
|
|
|
|
out:
|
|
IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
|
|
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
|
|
data->state = STATE_INACTIVE;
|
|
return -EINVAL;
|
|
|
|
finish_state_machine:
|
|
data->state = STATE_INACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
static const struct ir_raw_timings_pl ir_sony_timings = {
|
|
.header_pulse = SONY_HEADER_PULSE,
|
|
.bit_space = SONY_BIT_SPACE,
|
|
.bit_pulse[0] = SONY_BIT_0_PULSE,
|
|
.bit_pulse[1] = SONY_BIT_1_PULSE,
|
|
.trailer_space = SONY_TRAILER_SPACE + SONY_BIT_SPACE,
|
|
.msb_first = 0,
|
|
};
|
|
|
|
/**
|
|
* ir_sony_encode() - Encode a scancode as a stream of raw events
|
|
*
|
|
* @protocol: protocol to encode
|
|
* @scancode: scancode to encode
|
|
* @events: array of raw ir events to write into
|
|
* @max: maximum size of @events
|
|
*
|
|
* Returns: The number of events written.
|
|
* -ENOBUFS if there isn't enough space in the array to fit the
|
|
* encoding. In this case all @max events will have been written.
|
|
*/
|
|
static int ir_sony_encode(enum rc_type protocol, u32 scancode,
|
|
struct ir_raw_event *events, unsigned int max)
|
|
{
|
|
struct ir_raw_event *e = events;
|
|
u32 raw, len;
|
|
int ret;
|
|
|
|
if (protocol == RC_TYPE_SONY12) {
|
|
raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9);
|
|
len = 12;
|
|
} else if (protocol == RC_TYPE_SONY15) {
|
|
raw = (scancode & 0x7f) | ((scancode & 0xff0000) >> 9);
|
|
len = 15;
|
|
} else {
|
|
raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9) |
|
|
((scancode & 0xff00) << 4);
|
|
len = 20;
|
|
}
|
|
|
|
ret = ir_raw_gen_pl(&e, max, &ir_sony_timings, len, raw);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return e - events;
|
|
}
|
|
|
|
static struct ir_raw_handler sony_handler = {
|
|
.protocols = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
|
|
.decode = ir_sony_decode,
|
|
.encode = ir_sony_encode,
|
|
};
|
|
|
|
static int __init ir_sony_decode_init(void)
|
|
{
|
|
ir_raw_handler_register(&sony_handler);
|
|
|
|
printk(KERN_INFO "IR Sony protocol handler initialized\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ir_sony_decode_exit(void)
|
|
{
|
|
ir_raw_handler_unregister(&sony_handler);
|
|
}
|
|
|
|
module_init(ir_sony_decode_init);
|
|
module_exit(ir_sony_decode_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
|
|
MODULE_DESCRIPTION("Sony IR protocol decoder");
|