V4L/DVB: ir-core: Add JVC support to ir-core
authorDavid Härdeman <david@hardeman.nu>
Thu, 15 Apr 2010 21:46:05 +0000 (18:46 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Wed, 19 May 2010 15:57:43 +0000 (12:57 -0300)
This patch adds a JVC decoder to ir-core.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
drivers/media/IR/Kconfig
drivers/media/IR/Makefile
drivers/media/IR/ir-core-priv.h
drivers/media/IR/ir-jvc-decoder.c [new file with mode: 0644]
drivers/media/IR/ir-raw-event.c
drivers/media/IR/ir-sysfs.c
include/media/rc-map.h

index dae5ea113867dbf8a70fed42adc426306a9d984e..e87242af9b351d2f56e97892a9eaec0bf1c6be86 100644 (file)
@@ -37,6 +37,15 @@ config IR_RC6_DECODER
           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.
+
 config IR_IMON
        tristate "SoundGraph iMON Receiver and Display"
        depends on USB_ARCH_HAS_HCD
index 57b145515d4fcc52882f9923b6737a204c8c6504..937cbdedc7c171c48377e6cdadb89ac416b9b952 100644 (file)
@@ -8,6 +8,7 @@ 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
 
 # stand-alone IR receivers/transmitters
 obj-$(CONFIG_IR_IMON) += imon.o
index f965024385d8207a5a2eabd093d0dcb2299f3555..464e392f24cf329e6204a6fb2b979f45424fafcd 100644 (file)
@@ -109,4 +109,11 @@ 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 (file)
index 0000000..0b80494
--- /dev/null
@@ -0,0 +1,320 @@
+/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol
+ *
+ * Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
+ *
+ * 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@hardeman.nu>");
+MODULE_DESCRIPTION("JVC IR protocol decoder");
index 59f173c45b9da3561b5ea338c890575c84851355..7eef6bf4404f70ed2e1b96bcc081e9712bc6be71 100644 (file)
@@ -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
index ceec980552a4d7def2f1f9a80c0d7823b2445ce0..3ec760a98061b4288f724124990db81c1dd9d5d8 100644 (file)
@@ -63,6 +63,8 @@ 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";
 
@@ -100,6 +102,8 @@ 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) {
index 29b7aa3603ea15bcf05023cddc5ce7d7c2c5e90c..5814ec0455593b7c9418845cbbcec9a5719f2834 100644 (file)
@@ -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 {