This patch adds a JVC decoder to ir-core.
Signed-off-by: David Härdeman <david@xxxxxxxxxxx>
---
drivers/media/IR/Kconfig | 9 +
drivers/media/IR/Makefile | 1
drivers/media/IR/ir-core-priv.h | 7 +
drivers/media/IR/ir-jvc-decoder.c | 320 +++++++++++++++++++++++++++++++++++++
drivers/media/IR/ir-raw-event.c | 1
drivers/media/IR/ir-sysfs.c | 4
6 files changed, 342 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/IR/ir-jvc-decoder.c
diff --git a/drivers/media/IR/Kconfig b/drivers/media/IR/Kconfig
index ee66d16..179e4c3 100644
--- a/drivers/media/IR/Kconfig
+++ b/drivers/media/IR/Kconfig
@@ -36,3 +36,12 @@ config IR_RC6_DECODER
---help---
Enable this option if you have an infrared remote control which
uses the RC6 protocol, and you need software decoding support.
+
+config IR_JVC_DECODER
+ tristate "Enable IR raw decoder for the JVC protocol"
+ depends on IR_CORE
+ default y
+
+ ---help---
+ Enable this option if you have an infrared remote control which
+ uses the JVC protocol, and you need software decoding support.
diff --git a/drivers/media/IR/Makefile b/drivers/media/IR/Makefile
index 792d9ca..8d0098f 100644
--- a/drivers/media/IR/Makefile
+++ b/drivers/media/IR/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_VIDEO_IR) += ir-common.o
obj-$(CONFIG_IR_NEC_DECODER) += ir-nec-decoder.o
obj-$(CONFIG_IR_RC5_DECODER) += ir-rc5-decoder.o
obj-$(CONFIG_IR_RC6_DECODER) += ir-rc6-decoder.o
+obj-$(CONFIG_IR_JVC_DECODER) += ir-jvc-decoder.o
diff --git a/drivers/media/IR/ir-core-priv.h b/drivers/media/IR/ir-core-priv.h
index 707beeb..4b1a21d 100644
--- a/drivers/media/IR/ir-core-priv.h
+++ b/drivers/media/IR/ir-core-priv.h
@@ -111,4 +111,11 @@ void ir_raw_init(void);
#define load_rc6_decode() 0
#endif
+/* from ir-jvc-decoder.c */
+#ifdef CONFIG_IR_JVC_DECODER_MODULE
+#define load_jvc_decode() request_module("ir-jvc-decoder")
+#else
+#define load_jvc_decode() 0
+#endif
+
#endif /* _IR_RAW_EVENT */
diff --git a/drivers/media/IR/ir-jvc-decoder.c b/drivers/media/IR/ir-jvc-decoder.c
new file mode 100644
index 0000000..0b80494
--- /dev/null
+++ b/drivers/media/IR/ir-jvc-decoder.c
@@ -0,0 +1,320 @@
+/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol
+ *
+ * Copyright (C) 2010 by David Härdeman <david@xxxxxxxxxxx>
+ *
+ * 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 "ir-core-priv.h"
+
+#define JVC_NBITS 16 /* dev(8) + func(8) */
+#define JVC_UNIT 525000 /* ns */
+#define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */
+#define JVC_HEADER_SPACE (8 * JVC_UNIT)
+#define JVC_BIT_PULSE (1 * JVC_UNIT)
+#define JVC_BIT_0_SPACE (1 * JVC_UNIT)
+#define JVC_BIT_1_SPACE (3 * JVC_UNIT)
+#define JVC_TRAILER_PULSE (1 * JVC_UNIT)
+#define JVC_TRAILER_SPACE (35 * JVC_UNIT)
+
+/* Used to register jvc_decoder clients */
+static LIST_HEAD(decoder_list);
+DEFINE_SPINLOCK(decoder_lock);
+
+enum jvc_state {
+ STATE_INACTIVE,
+ STATE_HEADER_SPACE,
+ STATE_BIT_PULSE,
+ STATE_BIT_SPACE,
+ STATE_TRAILER_PULSE,
+ STATE_TRAILER_SPACE,
+};
+
+struct decoder_data {
+ struct list_head list;
+ struct ir_input_dev *ir_dev;
+ int enabled:1;
+
+ /* State machine control */
+ enum jvc_state state;
+ u16 jvc_bits;
+ u16 jvc_old_bits;
+ unsigned count;
+ bool first;
+ bool toggle;
+};
+
+
+/**
+ * get_decoder_data() - gets decoder data
+ * @input_dev: input device
+ *
+ * Returns the struct decoder_data that corresponds to a device
+ */
+static struct decoder_data *get_decoder_data(struct ir_input_dev *ir_dev)
+{
+ struct decoder_data *data = NULL;
+
+ spin_lock(&decoder_lock);
+ list_for_each_entry(data, &decoder_list, list) {
+ if (data->ir_dev == ir_dev)
+ break;
+ }
+ spin_unlock(&decoder_lock);
+ return data;
+}
+
+static ssize_t store_enabled(struct device *d,
+ struct device_attribute *mattr,
+ const char *buf,
+ size_t len)
+{
+ unsigned long value;
+ struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+ struct decoder_data *data = get_decoder_data(ir_dev);
+
+ if (!data)
+ return -EINVAL;
+
+ if (strict_strtoul(buf, 10, &value) || value > 1)
+ return -EINVAL;
+
+ data->enabled = value;
+
+ return len;
+}
+
+static ssize_t show_enabled(struct device *d,
+ struct device_attribute *mattr, char *buf)
+{
+ struct ir_input_dev *ir_dev = dev_get_drvdata(d);
+ struct decoder_data *data = get_decoder_data(ir_dev);
+
+ if (!data)
+ return -EINVAL;
+
+ if (data->enabled)
+ return sprintf(buf, "1\n");
+ else
+ return sprintf(buf, "0\n");
+}
+
+static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled);
+
+static struct attribute *decoder_attributes[] = {
+ &dev_attr_enabled.attr,
+ NULL
+};
+
+static struct attribute_group decoder_attribute_group = {
+ .name = "jvc_decoder",
+ .attrs = decoder_attributes,
+};
+
+/**
+ * ir_jvc_decode() - Decode one JVC pulse or space
+ * @input_dev: the struct input_dev descriptor of the device
+ * @duration: the struct ir_raw_event descriptor of the pulse/space
+ *
+ * This function returns -EINVAL if the pulse violates the state machine
+ */
+static int ir_jvc_decode(struct input_dev *input_dev, struct ir_raw_event ev)
+{
+ struct decoder_data *data;
+ struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+
+ data = get_decoder_data(ir_dev);
+ if (!data)
+ return -EINVAL;
+
+ if (!data->enabled)
+ return 0;
+
+ if (IS_RESET(ev)) {
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+
+ if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2))
+ goto out;
+
+ IR_dprintk(2, "JVC 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, JVC_HEADER_PULSE, JVC_UNIT / 2))
+ break;
+
+ data->count = 0;
+ data->first = true;
+ data->toggle = !data->toggle;
+ data->state = STATE_HEADER_SPACE;
+ return 0;
+
+ case STATE_HEADER_SPACE:
+ if (ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2))
+ break;
+
+ data->state = STATE_BIT_PULSE;
+ return 0;
+
+ case STATE_BIT_PULSE:
+ if (!ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2))
+ break;
+
+ data->state = STATE_BIT_SPACE;
+ return 0;
+
+ case STATE_BIT_SPACE:
+ if (ev.pulse)
+ break;
+
+ data->jvc_bits <<= 1;
+ if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) {
+ data->jvc_bits |= 1;
+ decrease_duration(&ev, JVC_BIT_1_SPACE);
+ } else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2))
+ decrease_duration(&ev, JVC_BIT_0_SPACE);
+ else
+ break;
+ data->count++;
+
+ if (data->count == JVC_NBITS)
+ data->state = STATE_TRAILER_PULSE;
+ else
+ data->state = STATE_BIT_PULSE;
+ return 0;
+
+ case STATE_TRAILER_PULSE:
+ if (!ev.pulse)
+ break;
+
+ if (!eq_margin(ev.duration, JVC_TRAILER_PULSE, JVC_UNIT / 2))
+ break;
+
+ data->state = STATE_TRAILER_SPACE;
+ return 0;
+
+ case STATE_TRAILER_SPACE:
+ if (ev.pulse)
+ break;
+
+ if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2))
+ break;
+
+ if (data->first) {
+ u32 scancode;
+ scancode = (bitrev8((data->jvc_bits >> 8) & 0xff) << 8) |
+ (bitrev8((data->jvc_bits >> 0) & 0xff) << 0);
+ IR_dprintk(1, "JVC scancode 0x%04x\n", scancode);
+ ir_keydown(input_dev, scancode, data->toggle);
+ data->first = false;
+ data->jvc_old_bits = data->jvc_bits;
+ } else if (data->jvc_bits == data->jvc_old_bits) {
+ IR_dprintk(1, "JVC repeat\n");
+ ir_repeat(input_dev);
+ } else {
+ IR_dprintk(1, "JVC invalid repeat msg\n");
+ break;
+ }
+
+ data->count = 0;
+ data->state = STATE_BIT_PULSE;
+ return 0;
+ }
+
+out:
+ IR_dprintk(1, "JVC decode failed at state %d (%uus %s)\n",
+ data->state, TO_US(ev.duration), TO_STR(ev.pulse));
+ data->state = STATE_INACTIVE;
+ return -EINVAL;
+}
+
+static int ir_jvc_register(struct input_dev *input_dev)
+{
+ struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+ struct decoder_data *data;
+ int rc;
+
+ rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
+ if (rc < 0)
+ return rc;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
+ return -ENOMEM;
+ }
+
+ data->ir_dev = ir_dev;
+ data->enabled = 1;
+
+ spin_lock(&decoder_lock);
+ list_add_tail(&data->list, &decoder_list);
+ spin_unlock(&decoder_lock);
+
+ return 0;
+}
+
+static int ir_jvc_unregister(struct input_dev *input_dev)
+{
+ struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+ static struct decoder_data *data;
+
+ data = get_decoder_data(ir_dev);
+ if (!data)
+ return 0;
+
+ sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
+
+ spin_lock(&decoder_lock);
+ list_del(&data->list);
+ spin_unlock(&decoder_lock);
+
+ return 0;
+}
+
+static struct ir_raw_handler jvc_handler = {
+ .decode = ir_jvc_decode,
+ .raw_register = ir_jvc_register,
+ .raw_unregister = ir_jvc_unregister,
+};
+
+static int __init ir_jvc_decode_init(void)
+{
+ ir_raw_handler_register(&jvc_handler);
+
+ printk(KERN_INFO "IR JVC protocol handler initialized\n");
+ return 0;
+}
+
+static void __exit ir_jvc_decode_exit(void)
+{
+ ir_raw_handler_unregister(&jvc_handler);
+}
+
+module_init(ir_jvc_decode_init);
+module_exit(ir_jvc_decode_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Härdeman <david@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("JVC IR protocol decoder");
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index 59f173c..7eef6bf 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -233,6 +233,7 @@ static void init_decoders(struct work_struct *work)
load_nec_decode();
load_rc5_decode();
load_rc6_decode();
+ load_jvc_decode();
/* If needed, we may later add some init code. In this case,
it is needed to change the CONFIG_MODULE test at ir-core.h
diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
index d7ec973..8e2751e 100644
--- a/drivers/media/IR/ir-sysfs.c
+++ b/drivers/media/IR/ir-sysfs.c
@@ -62,6 +62,8 @@ static ssize_t show_protocol(struct device *d,
s = "nec";
else if (ir_type == IR_TYPE_RC6)
s = "rc6";
+ else if (ir_type == IR_TYPE_JVC)
+ s = "jvc";
else
s = "other";
@@ -99,6 +101,8 @@ static ssize_t store_protocol(struct device *d,
ir_type |= IR_TYPE_PD;
if (!strcasecmp(buf, "nec"))
ir_type |= IR_TYPE_NEC;
+ if (!strcasecmp(buf, "jvc"))
+ ir_type |= IR_TYPE_JVC;
}
if (!ir_type) {
diff --git a/include/media/rc-map.h b/include/media/rc-map.h
index 11f6618..214f072 100644
--- a/include/media/rc-map.h
+++ b/include/media/rc-map.h
@@ -16,6 +16,7 @@
#define IR_TYPE_PD (1 << 1) /* Pulse distance encoded IR */
#define IR_TYPE_NEC (1 << 2)
#define IR_TYPE_RC6 (1 << 3) /* Philips RC6 protocol */
+#define IR_TYPE_JVC (1 << 4) /* JVC protocol */
#define IR_TYPE_OTHER (1u << 31)
struct ir_scancode {
--
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