summaryrefslogtreecommitdiff
path: root/drivers/media
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/rc/Kconfig13
-rw-r--r--drivers/media/rc/Makefile1
-rw-r--r--drivers/media/rc/ir-rcmm-decoder.c254
-rw-r--r--drivers/media/rc/rc-core-priv.h5
-rw-r--r--drivers/media/rc/rc-main.c9
5 files changed, 282 insertions, 0 deletions
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 8a216068a35a..8e95f6eac89d 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -133,6 +133,19 @@ 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 when you have IR with RC-MM protocol, and
+ you need the software decoder. The driver supports 12,
+ 24 and 32 bits RC-MM variants. You can enable or disable the
+ different modes using the following RC protocol keywords:
+ 'rc-mm-12', 'rc-mm-24' and 'rc-mm-32'.
+
+ To compile this driver as a module, choose M here: the module
+ will be called ir-rcmm-decoder.
+
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..f1096ac1e5c5
--- /dev/null
+++ b/drivers/media/rc/ir-rcmm-decoder.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0+
+// ir-rcmm-decoder.c - A decoder for the RCMM IR protocol
+//
+// Copyright (C) 2018 by Patrick Lerda <patrick9876@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(const struct rcmm_dec *data)
+{
+ return !((0x000c0000 & data->bits) == 0x000c0000);
+}
+
+static int rcmm_miscmode(struct rc_dev *dev, struct rcmm_dec *data)
+{
+ switch (data->count) {
+ case 24:
+ if (dev->enabled_protocols & RC_PROTO_BIT_RCMM24) {
+ rc_keydown(dev, RC_PROTO_RCMM24, data->bits, 0);
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+ return -1;
+
+ case 12:
+ if (dev->enabled_protocols & RC_PROTO_BIT_RCMM12) {
+ rc_keydown(dev, RC_PROTO_RCMM12, data->bits, 0);
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+ return -1;
+ }
+
+ return -1;
+}
+
+/**
+ * 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_RCMM32 |
+ RC_PROTO_BIT_RCMM24 |
+ RC_PROTO_BIT_RCMM12)))
+ return 0;
+
+ if (!is_timing_event(ev)) {
+ if (ev.reset)
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+
+ 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
+ value = -1;
+
+ if (value == -1) {
+ if (!rcmm_miscmode(dev, data))
+ return 0;
+ 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;
+ }
+
+ if (dev->enabled_protocols & RC_PROTO_BIT_RCMM32) {
+ rc_keydown(dev, RC_PROTO_RCMM32, scancode, toggle);
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+
+ break;
+ }
+
+ data->state = STATE_INACTIVE;
+ return -EINVAL;
+}
+
+static const int rcmmspace[] = {
+ RCMM_PULSE_0,
+ RCMM_PULSE_1,
+ RCMM_PULSE_2,
+ RCMM_PULSE_3,
+};
+
+static int ir_rcmm_rawencoder(struct ir_raw_event **ev, unsigned int max,
+ unsigned int n, u32 data)
+{
+ int i;
+ int ret;
+
+ ret = ir_raw_gen_pulse_space(ev, &max, RCMM_PREFIX_PULSE, RCMM_PULSE_0);
+ if (ret)
+ return ret;
+
+ for (i = n - 2; i >= 0; i -= 2) {
+ const unsigned int space = rcmmspace[(data >> i) & 3];
+
+ ret = ir_raw_gen_pulse_space(ev, &max, RCMM_UNIT, space);
+ if (ret)
+ return ret;
+ }
+
+ return ir_raw_gen_pulse_space(ev, &max, RCMM_UNIT, RCMM_PULSE_3 * 2);
+}
+
+static int ir_rcmm_encode(enum rc_proto protocol, u32 scancode,
+ struct ir_raw_event *events, unsigned int max)
+{
+ struct ir_raw_event *e = events;
+ int ret;
+
+ switch (protocol) {
+ case RC_PROTO_RCMM32:
+ ret = ir_rcmm_rawencoder(&e, max, 32, scancode);
+ break;
+ case RC_PROTO_RCMM24:
+ ret = ir_rcmm_rawencoder(&e, max, 24, scancode);
+ break;
+ case RC_PROTO_RCMM12:
+ ret = ir_rcmm_rawencoder(&e, max, 12, scancode);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ return e - events;
+}
+
+static struct ir_raw_handler rcmm_handler = {
+ .protocols = RC_PROTO_BIT_RCMM32 |
+ RC_PROTO_BIT_RCMM24 |
+ RC_PROTO_BIT_RCMM12,
+ .decode = ir_rcmm_decode,
+ .encode = ir_rcmm_encode,
+ .carrier = 36000,
+ .min_timeout = RCMM_PULSE_3 + RCMM_UNIT,
+};
+
+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..9f21b3e8b377 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;
+ u32 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..dc38e9c0a2ff 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -70,6 +70,12 @@ static const struct {
[RC_PROTO_CEC] = { .name = "cec", .repeat_period = 0 },
[RC_PROTO_IMON] = { .name = "imon",
.scancode_bits = 0x7fffffff, .repeat_period = 114 },
+ [RC_PROTO_RCMM12] = { .name = "rc-mm-12",
+ .scancode_bits = 0x00000fff, .repeat_period = 114 },
+ [RC_PROTO_RCMM24] = { .name = "rc-mm-24",
+ .scancode_bits = 0x00ffffff, .repeat_period = 114 },
+ [RC_PROTO_RCMM32] = { .name = "rc-mm-32",
+ .scancode_bits = 0xffffffff, .repeat_period = 114 },
};
/* Used to keep track of known keymaps */
@@ -1006,6 +1012,9 @@ 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_RCMM12 |
+ RC_PROTO_BIT_RCMM24 |
+ RC_PROTO_BIT_RCMM32, "rc-mm", "ir-rcmm-decoder" },
};
/**
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 22:25:20 +0000