media: add support for RCMM infrared remote controls.
Signed-off-by: Patrick Lerda <patrick9...@free.fr>
---
MAINTAINERS | 5 +
drivers/media/rc/Kconfig | 7 ++
drivers/media/rc/Makefile | 1 +
drivers/media/rc/ir-rcmm-decoder.c | 164 +++++++++++++++++++++++++++++
drivers/media/rc/rc-core-priv.h | 5 +
drivers/media/rc/rc-main.c | 3 +
include/media/rc-map.h | 6 +-
include/uapi/linux/lirc.h | 2 +
tools/include/uapi/linux/lirc.h | 2 +
9 files changed, 193 insertions(+), 2 deletions(-)
create mode 100644 drivers/media/rc/ir-rcmm-decoder.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 3e9f1710ed13..80426d1faaba 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16277,6 +16277,11 @@ M: David Härdeman <da...@hardeman.nu>
S: Maintained
F: drivers/media/rc/winbond-cir.c
+RCMM REMOTE CONTROLS DECODER
+M: Patrick Lerda <patrick9...@free.fr>
+S: Maintained
+F: drivers/media/rc/ir-rcmm-decoder.c
+
WINSYSTEMS EBC-C384 WATCHDOG DRIVER
M: William Breathitt Gray <vilhelm.g...@gmail.com>
L: linux-watch...@vger.kernel.org
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 8a216068a35a..43775ac74268 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -133,6 +133,13 @@ config IR_IMON_DECODER
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.
+config IR_RCMM_DECODER
+ tristate "Enable IR raw decoder for the RC-MM protocol"
+ depends on RC_CORE
+ help
+ Enable this option if you have IR with RC-MM protocol, and
+ if the IR is decoded in software
+
endif #RC_DECODERS
menuconfig RC_DEVICES
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 92c163816849..48d23433b3c0 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -16,6 +16,7 @@ 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
+obj-$(CONFIG_IR_RCMM_DECODER) += ir-rcmm-decoder.o
# stand-alone IR receivers/transmitters
obj-$(CONFIG_RC_ATI_REMOTE) += ati_remote.o
diff --git a/drivers/media/rc/ir-rcmm-decoder.c
b/drivers/media/rc/ir-rcmm-decoder.c
new file mode 100644
index 000000000000..a3c09885da5f
--- /dev/null
+++ b/drivers/media/rc/ir-rcmm-decoder.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0+
+// ir-rcmm-decoder.c - A decoder for the RCMM IR protocol
+//
+// Copyright (C) 2018 by Patrick Lerda <patrick9...@free.fr>
+
+#include "rc-core-priv.h"
+#include <linux/module.h>
+#include <linux/version.h>
+
+#define RCMM_UNIT 166667 /* nanosecs */
+#define RCMM_PREFIX_PULSE 416666 /* 166666.666666666*2.5 */
+#define RCMM_PULSE_0 277777 /* 166666.666666666*(1+2/3) */
+#define RCMM_PULSE_1 444444 /* 166666.666666666*(2+2/3) */
+#define RCMM_PULSE_2 611111 /* 166666.666666666*(3+2/3) */
+#define RCMM_PULSE_3 777778 /* 166666.666666666*(4+2/3) */
+
+enum rcmm_state {
+ STATE_INACTIVE,
+ STATE_LOW,
+ STATE_BUMP,
+ STATE_VALUE,
+ STATE_FINISHED,
+};
+
+static bool rcmm_mode(struct rcmm_dec *data)
+{
+ return !((0x000c0000 & data->bits) == 0x000c0000);
+}
+
+/**
+ * ir_rcmm_decode() - Decode one RCMM 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_rcmm_decode(struct rc_dev *dev, struct ir_raw_event ev)
+{
+ struct rcmm_dec *data = &dev->raw->rcmm;
+ u32 scancode;
+ u8 toggle;
+ int value;
+
+ if (!(dev->enabled_protocols & RC_PROTO_BIT_RCMM))
+ return 0;
+
+ if (!is_timing_event(ev)) {
+ if (ev.reset)
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+
+ if (ev.duration > RCMM_PULSE_3 + RCMM_UNIT)
+ goto out;
+
+ switch (data->state) {
+ case STATE_INACTIVE:
+ if (!ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, RCMM_PREFIX_PULSE, RCMM_UNIT / 2))
+ break;
+
+ data->state = STATE_LOW;
+ data->count = 0;
+ data->bits = 0;
+ return 0;
+
+ case STATE_LOW:
+ if (ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, RCMM_PULSE_0, RCMM_UNIT / 2))
+ break;
+
+ data->state = STATE_BUMP;
+ return 0;
+
+ case STATE_BUMP:
+ if (!ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, RCMM_UNIT, RCMM_UNIT / 2))
+ break;
+
+ data->state = STATE_VALUE;
+ return 0;
+
+ case STATE_VALUE:
+ if (ev.pulse)
+ break;
+
+ if (eq_margin(ev.duration, RCMM_PULSE_0, RCMM_UNIT / 2))
+ value = 0;
+ else if (eq_margin(ev.duration, RCMM_PULSE_1, RCMM_UNIT / 2))
+ value = 1;
+ else if (eq_margin(ev.duration, RCMM_PULSE_2, RCMM_UNIT / 2))
+ value = 2;
+ else if (eq_margin(ev.duration, RCMM_PULSE_3, RCMM_UNIT / 2))
+ value = 3;
+ else
+ break;
+
+ data->bits <<= 2;
+ data->bits |= value;
+
+ data->count += 2;
+
+ if (data->count < 32)
+ data->state = STATE_BUMP;
+ else
+ data->state = STATE_FINISHED;
+
+ return 0;
+
+ case STATE_FINISHED:
+ if (!ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, RCMM_UNIT, RCMM_UNIT / 2))
+ break;
+
+ if (rcmm_mode(data)) {
+ toggle = !!(0x8000 & data->bits);
+ scancode = data->bits & ~0x8000;
+ } else {
+ toggle = 0;
+ scancode = data->bits;
+ }
+
+ rc_keydown(dev, RC_PROTO_RCMM, scancode, toggle);
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+
+out:
+ data->state = STATE_INACTIVE;
+ return -EINVAL;
+}
+
+static struct ir_raw_handler rcmm_handler = {
+ .protocols = RC_PROTO_BIT_RCMM,
+ .decode = ir_rcmm_decode,
+};
+
+static int __init ir_rcmm_decode_init(void)
+{
+ ir_raw_handler_register(&rcmm_handler);
+
+ pr_info("IR RCMM protocol handler initialized\n");
+ return 0;
+}
+
+static void __exit ir_rcmm_decode_exit(void)
+{
+ ir_raw_handler_unregister(&rcmm_handler);
+}
+
+module_init(ir_rcmm_decode_init);
+module_exit(ir_rcmm_decode_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick Lerda");
+MODULE_DESCRIPTION("RCMM IR protocol decoder");
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index c2cbe7f6266c..2266f61f887f 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -131,6 +131,11 @@ struct ir_raw_event_ctrl {
unsigned int bits;
bool stick_keyboard;
} imon;
+ struct rcmm_dec {
+ int state;
+ unsigned int count;
+ u64 bits;
+ } rcmm;
};
/* Mutex for locking raw IR processing and handler change */
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 66a174979b3c..7df40578dac0 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -70,6 +70,8 @@ static const struct {
[RC_PROTO_CEC] = { .name = "cec", .repeat_period = 0 },
[RC_PROTO_IMON] = { .name = "imon",
.scancode_bits = 0x7fffffff, .repeat_period = 114 },
+ [RC_PROTO_RCMM] = { .name = "rcmm",
+ .scancode_bits = 0xffffffff, .repeat_period = 114 },
};
/* Used to keep track of known keymaps */
@@ -1006,6 +1008,7 @@ static const struct {
{ RC_PROTO_BIT_XMP, "xmp", "ir-xmp-decoder" },
{ RC_PROTO_BIT_CEC, "cec", NULL },
{ RC_PROTO_BIT_IMON, "imon", "ir-imon-decoder" },
+ { RC_PROTO_BIT_RCMM, "rcmm", "ir-rcmm-decoder" },
};
/**
diff --git a/include/media/rc-map.h b/include/media/rc-map.h
index d621acadfbf3..ff5e3b002f91 100644
--- a/include/media/rc-map.h
+++ b/include/media/rc-map.h
@@ -37,6 +37,7 @@
#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_RCMM BIT_ULL(RC_PROTO_RCMM)
#define RC_PROTO_BIT_ALL \
(RC_PROTO_BIT_UNKNOWN | RC_PROTO_BIT_OTHER | \
@@ -51,7 +52,7 @@
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_IMON)
+ RC_PROTO_BIT_IMON | RC_PROTO_BIT_RCMM)
/* All rc protocols for which we have decoders */
#define RC_PROTO_BIT_ALL_IR_DECODER \
(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
@@ -64,7 +65,8 @@
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_IMON)
+ RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON | \
+ RC_PROTO_BIT_RCMM)
#define RC_PROTO_BIT_ALL_IR_ENCODER \
(RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \
diff --git a/include/uapi/linux/lirc.h b/include/uapi/linux/lirc.h
index 6b319581882f..56106ccea2cb 100644
--- a/include/uapi/linux/lirc.h
+++ b/include/uapi/linux/lirc.h
@@ -192,6 +192,7 @@ struct lirc_scancode {
* @RC_PROTO_XMP: XMP protocol
* @RC_PROTO_CEC: CEC protocol
* @RC_PROTO_IMON: iMon Pad protocol
+ * @RC_PROTO_RCMM: RC-MM protocol
*/
enum rc_proto {
RC_PROTO_UNKNOWN = 0,
@@ -218,6 +219,7 @@ enum rc_proto {
RC_PROTO_XMP = 21,
RC_PROTO_CEC = 22,
RC_PROTO_IMON = 23,
+ RC_PROTO_RCMM = 24,
};
#endif
diff --git a/tools/include/uapi/linux/lirc.h b/tools/include/uapi/linux/lirc.h
index f189931042a7..c1e5850c56e1 100644
--- a/tools/include/uapi/linux/lirc.h
+++ b/tools/include/uapi/linux/lirc.h
@@ -186,6 +186,7 @@ struct lirc_scancode {
* @RC_PROTO_XMP: XMP protocol
* @RC_PROTO_CEC: CEC protocol
* @RC_PROTO_IMON: iMon Pad protocol
+ * @RC_PROTO_RCMM: RC-MM protocol
*/
enum rc_proto {
RC_PROTO_UNKNOWN = 0,
@@ -212,6 +213,7 @@ enum rc_proto {
RC_PROTO_XMP = 21,
RC_PROTO_CEC = 22,
RC_PROTO_IMON = 23,
+ RC_PROTO_RCMM = 24,
};
#endif
--
2.19.2
