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media: rc: add new imon protocol decoder and encoder 

This makes it possible to use the various iMON remotes with any raw IR
RC device.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sean Young 2017-12-03 11:06:54 -05:00 committed by Mauro Carvalho Chehab
parent 8d4068810d
commit 447dcc0cf1
8 changed files with 220 additions and 5 deletions
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9
drivers/media/rc/Kconfig
View File

@ -111,6 +111,15 @@ config IR_XMP_DECODER
---help---
Enable this option if you have IR with XMP protocol, and
if the IR is decoded in software
config IR_IMON_DECODER
tristate "Enable IR raw decoder for the iMON protocol"
depends on RC_CORE
---help---
Enable this option if you have iMON PAD or Antec Veris infrared
remote control and you would like to use it with a raw IR
receiver, or if you wish to use an encoder to transmit this IR.
endif #RC_DECODERS
menuconfig RC_DEVICES

1
drivers/media/rc/Makefile
View File

@ -14,6 +14,7 @@ obj-$(CONFIG_IR_SANYO_DECODER) += ir-sanyo-decoder.o
obj-$(CONFIG_IR_SHARP_DECODER) += ir-sharp-decoder.o
obj-$(CONFIG_IR_MCE_KBD_DECODER) += ir-mce_kbd-decoder.o
obj-$(CONFIG_IR_XMP_DECODER) += ir-xmp-decoder.o
obj-$(CONFIG_IR_IMON_DECODER) += ir-imon-decoder.o
# stand-alone IR receivers/transmitters
obj-$(CONFIG_RC_ATI_REMOTE) += ati_remote.o

193
drivers/media/rc/ir-imon-decoder.c Normal file
View File

@ -0,0 +1,193 @@
// SPDX-License-Identifier: GPL-2.0+
// ir-imon-decoder.c - handle iMon protocol
//
// Copyright (C) 2018 by Sean Young <sean@mess.org>
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include "rc-core-priv.h"
#define IMON_UNIT 415662 /* ns */
#define IMON_BITS 30
#define IMON_CHKBITS (BIT(30) | BIT(25) | BIT(24) | BIT(22) | \
BIT(21) | BIT(20) | BIT(19) | BIT(18) | \
BIT(17) | BIT(16) | BIT(14) | BIT(13) | \
BIT(12) | BIT(11) | BIT(10) | BIT(9))
/*
* This protocol has 30 bits. The format is one IMON_UNIT header pulse,
* followed by 30 bits. Each bit is one IMON_UNIT check field, and then
* one IMON_UNIT field with the actual bit (1=space, 0=pulse).
* The check field is always space for some bits, for others it is pulse if
* both the preceding and current bit are zero, else space. IMON_CHKBITS
* defines which bits are of type check.
*
* There is no way to distinguish an incomplete message from one where
* the lower bits are all set, iow. the last pulse is for the lowest
* bit which is 0.
*/
enum imon_state {
STATE_INACTIVE,
STATE_BIT_CHK,
STATE_BIT_START,
STATE_FINISHED
};
/**
* ir_imon_decode() - Decode one iMON 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_imon_decode(struct rc_dev *dev, struct ir_raw_event ev)
{
struct imon_dec *data = &dev->raw->imon;
if (!is_timing_event(ev)) {
if (ev.reset)
data->state = STATE_INACTIVE;
return 0;
}
dev_dbg(&dev->dev,
"iMON decode started at state %d bitno %d (%uus %s)\n",
data->state, data->count, TO_US(ev.duration),
TO_STR(ev.pulse));
for (;;) {
if (!geq_margin(ev.duration, IMON_UNIT, IMON_UNIT / 2))
return 0;
decrease_duration(&ev, IMON_UNIT);
switch (data->state) {
case STATE_INACTIVE:
if (ev.pulse) {
data->state = STATE_BIT_CHK;
data->bits = 0;
data->count = IMON_BITS;
}
break;
case STATE_BIT_CHK:
if (IMON_CHKBITS & BIT(data->count))
data->last_chk = ev.pulse;
else if (ev.pulse)
goto err_out;
data->state = STATE_BIT_START;
break;
case STATE_BIT_START:
data->bits <<= 1;
if (!ev.pulse)
data->bits |= 1;
if (IMON_CHKBITS & BIT(data->count)) {
if (data->last_chk != !(data->bits & 3))
goto err_out;
}
if (!data->count--)
data->state = STATE_FINISHED;
else
data->state = STATE_BIT_CHK;
break;
case STATE_FINISHED:
if (ev.pulse)
goto err_out;
rc_keydown(dev, RC_PROTO_IMON, data->bits, 0);
data->state = STATE_INACTIVE;
break;
}
}
err_out:
dev_dbg(&dev->dev,
"iMON decode failed at state %d bitno %d (%uus %s)\n",
data->state, data->count, TO_US(ev.duration),
TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}
/**
* ir_imon_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_imon_encode(enum rc_proto protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max)
{
struct ir_raw_event *e = events;
int i, pulse;
if (!max--)
return -ENOBUFS;
init_ir_raw_event_duration(e, 1, IMON_UNIT);
for (i = IMON_BITS; i >= 0; i--) {
if (BIT(i) & IMON_CHKBITS)
pulse = !(scancode & (BIT(i) | BIT(i + 1)));
else
pulse = 0;
if (pulse == e->pulse) {
e->duration += IMON_UNIT;
} else {
if (!max--)
return -ENOBUFS;
init_ir_raw_event_duration(++e, pulse, IMON_UNIT);
}
pulse = !(scancode & BIT(i));
if (pulse == e->pulse) {
e->duration += IMON_UNIT;
} else {
if (!max--)
return -ENOBUFS;
init_ir_raw_event_duration(++e, pulse, IMON_UNIT);
}
}
if (e->pulse)
e++;
return e - events;
}
static struct ir_raw_handler imon_handler = {
.protocols = RC_PROTO_BIT_IMON,
.decode = ir_imon_decode,
.encode = ir_imon_encode,
.carrier = 38000,
};
static int __init ir_imon_decode_init(void)
{
ir_raw_handler_register(&imon_handler);
pr_info("IR iMON protocol handler initialized\n");
return 0;
}
static void __exit ir_imon_decode_exit(void)
{
ir_raw_handler_unregister(&imon_handler);
}
module_init(ir_imon_decode_init);
module_exit(ir_imon_decode_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_DESCRIPTION("iMON IR protocol decoder");

3
drivers/media/rc/keymaps/rc-imon-pad.c
View File

@ -134,8 +134,7 @@ static struct rc_map_list imon_pad_map = {
.map = {
.scan = imon_pad,
.size = ARRAY_SIZE(imon_pad),
/* actual protocol details unknown, hardware decoder */
.rc_proto = RC_PROTO_OTHER,
.rc_proto = RC_PROTO_IMON,
.name = RC_MAP_IMON_PAD,
}
};

6
drivers/media/rc/rc-core-priv.h
View File

@ -118,6 +118,12 @@ struct ir_raw_event_ctrl {
unsigned count;
u32 durations[16];
} xmp;
struct imon_dec {
int state;
int count;
int last_chk;
unsigned int bits;
} imon;
};
/* macros for IR decoders */

3
drivers/media/rc/rc-main.c
View File

@ -68,6 +68,8 @@ static const struct {
.scancode_bits = 0x1fff, .repeat_period = 250 },
[RC_PROTO_XMP] = { .name = "xmp", .repeat_period = 250 },
[RC_PROTO_CEC] = { .name = "cec", .repeat_period = 550 },
[RC_PROTO_IMON] = { .name = "imon",
.scancode_bits = 0x7fffffff, .repeat_period = 250 },
};
/* Used to keep track of known keymaps */
@ -1004,6 +1006,7 @@ static const struct {
RC_PROTO_BIT_MCIR2_MSE, "mce_kbd", "ir-mce_kbd-decoder" },
{ RC_PROTO_BIT_XMP, "xmp", "ir-xmp-decoder" },
{ RC_PROTO_BIT_CEC, "cec", NULL },
{ RC_PROTO_BIT_IMON, "imon", "ir-imon-decoder" },
};
/**

8
include/media/rc-map.h
View File

@ -36,6 +36,7 @@
#define RC_PROTO_BIT_SHARP BIT_ULL(RC_PROTO_SHARP)
#define RC_PROTO_BIT_XMP BIT_ULL(RC_PROTO_XMP)
#define RC_PROTO_BIT_CEC BIT_ULL(RC_PROTO_CEC)
#define RC_PROTO_BIT_IMON BIT_ULL(RC_PROTO_IMON)
#define RC_PROTO_BIT_ALL \
(RC_PROTO_BIT_UNKNOWN | RC_PROTO_BIT_OTHER | \
@ -49,7 +50,8 @@
RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 | \
RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \
RC_PROTO_BIT_XMP | RC_PROTO_BIT_CEC)
RC_PROTO_BIT_XMP | RC_PROTO_BIT_CEC | \
RC_PROTO_BIT_IMON)
/* All rc protocols for which we have decoders */
#define RC_PROTO_BIT_ALL_IR_DECODER \
(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
@ -62,7 +64,7 @@
RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 | \
RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \
RC_PROTO_BIT_XMP)
RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON)
#define RC_PROTO_BIT_ALL_IR_ENCODER \
(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
@ -75,7 +77,7 @@
RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \
RC_PROTO_BIT_RC6_6A_24 | \
RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE | \
RC_PROTO_BIT_SHARP)
RC_PROTO_BIT_SHARP | RC_PROTO_BIT_IMON)
#define RC_SCANCODE_UNKNOWN(x) (x)
#define RC_SCANCODE_OTHER(x) (x)

2
include/uapi/linux/lirc.h
View File

@ -186,6 +186,7 @@ struct lirc_scancode {
* @RC_PROTO_SHARP: Sharp protocol
* @RC_PROTO_XMP: XMP protocol
* @RC_PROTO_CEC: CEC protocol
* @RC_PROTO_IMON: iMon Pad protocol
*/
enum rc_proto {
RC_PROTO_UNKNOWN = 0,
@ -211,6 +212,7 @@ enum rc_proto {
RC_PROTO_SHARP = 20,
RC_PROTO_XMP = 21,
RC_PROTO_CEC = 22,
RC_PROTO_IMON = 23,
};
#endif