This makes it possible to use the various iMON remotes with any raw IR
RC device.
Signed-off-by: Sean Young <s...@mess.org>
---
drivers/media/rc/Kconfig | 9 ++
drivers/media/rc/Makefile | 1 +
drivers/media/rc/ir-imon-codec.c | 192 +++++++++++++++++++++++++++++++++
drivers/media/rc/keymaps/rc-imon-pad.c | 2 +-
drivers/media/rc/rc-core-priv.h | 6 ++
drivers/media/rc/rc-main.c | 8 ++
include/media/rc-map.h | 8 +-
include/uapi/linux/lirc.h | 2 +
8 files changed, 224 insertions(+), 4 deletions(-)
create mode 100644 drivers/media/rc/ir-imon-codec.c
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 7ad05a6ef350..00df4779736c 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -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_CODEC
+ tristate "Enable IR raw codec for the iMON protocol"
+ depends on RC_CORE
+ ---help---
+ Enable this option if you have IR with iMON PAD protocol, and
+ 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
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index e098e127b26a..72e029af1669 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -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-$(CONFIG_IR_IMON_CODEC) += ir-imon-codec.o
# stand-alone IR receivers/transmitters
obj-$(CONFIG_RC_ATI_REMOTE) += ati_remote.o
diff --git a/drivers/media/rc/ir-imon-codec.c b/drivers/media/rc/ir-imon-codec.c
new file mode 100644
index 000000000000..f906196a5160
--- /dev/null
+++ b/drivers/media/rc/ir-imon-codec.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0+
+// ir-imon-codec.c - handle iMon protocol
+//
+// Copyright (C) 2018 by Sean Young <s...@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 (space=1, pulse=0).
+ * The check field is space for some bits, for others it is pulse if both the
+ * preceding and current bit are set, else space. IMON_CHKBITS defines
+ * which bits are of type check.
+ *
+ * If an incomplete message is received, then all the remaining bits
+ * are assumed to be 1. This is a problem in the protocol itself.
+ */
+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 bits %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:
+ if (!ev.pulse)
+ data->bits |= 1;
+
+ if (IMON_CHKBITS & BIT(data->count)) {
+ if (data->last_chk != !(data->bits & 3))
+ goto err_out;
+ }
+
+ data->bits <<= 1;
+ data->count--;
+
+ 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 | 1, 0);
+ data->state = STATE_INACTIVE;
+ break;
+ }
+ }
+
+err_out:
+ dev_dbg(&dev->dev,
+ "iMON decode failed at state %d bits %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;
+
+ 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 <s...@mess.org>");
+MODULE_DESCRIPTION("iMON IR protocol decoder");
diff --git a/drivers/media/rc/keymaps/rc-imon-pad.c
b/drivers/media/rc/keymaps/rc-imon-pad.c
index a7296ffbf218..0761bc8b4b38 100644
--- a/drivers/media/rc/keymaps/rc-imon-pad.c
+++ b/drivers/media/rc/keymaps/rc-imon-pad.c
@@ -135,7 +135,7 @@ static struct rc_map_list imon_pad_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,
}
};
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index 5e80b4273e2d..e0e6a17460f6 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -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 */
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 8621761a680f..681fbf3d9271 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -68,6 +68,7 @@ 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", .repeat_period = 250 },
};
/* Used to keep track of known keymaps */
@@ -869,6 +870,12 @@ bool rc_validate_scancode(enum rc_proto proto, u32
scancode)
if ((scancode & 0xffff0000) == 0x800f0000)
return false;
break;
+ /*
+ * iMon hardware decoder always sets some bits, so assume the same
+ */
+ case RC_PROTO_IMON:
+ if ((scancode & 0x800000001) != 1)
+ return false;
default:
break;
}
@@ -1004,6 +1011,7 @@ 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-codec" },
};
/**
diff --git a/include/media/rc-map.h b/include/media/rc-map.h
index 7fc84991bd12..bfa3017cecba 100644
--- a/include/media/rc-map.h
+++ b/include/media/rc-map.h
@@ -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)
diff --git a/include/uapi/linux/lirc.h b/include/uapi/linux/lirc.h
index 4fe580d36e41..948d9a491083 100644
--- a/include/uapi/linux/lirc.h
+++ b/include/uapi/linux/lirc.h
@@ -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
--
2.14.3
