With the help of raw_register/raw_unregister, adds a sysfs group
associated with the decoder, inside the corresponding irrcv node.
Writing 1 to nec_decoder/enabled enables the decoder, while
writing 0 disables it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c
index cb57cc2..83a9912 100644
--- a/drivers/media/IR/ir-nec-decoder.c
+++ b/drivers/media/IR/ir-nec-decoder.c
@@ -39,6 +39,85 @@
#define REPEAT_TIME 240 /* ms */
+/* Used to register nec_decoder clients */
+static LIST_HEAD(decoder_list);
+static spinlock_t decoder_lock;
+
+struct decoder_data {
+ struct list_head list;
+ struct ir_input_dev *ir_dev;
+ int enabled:1;
+};
+
+
+/**
+ * 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 = "nec_decoder",
+ .attrs = decoder_attributes,
+};
+
+
/** is_repeat - Check if it is a NEC repeat event
* @input_dev: the struct input_dev descriptor of the device
* @pos: the position of the first event
@@ -184,9 +263,15 @@ static int ir_nec_decode(struct input_dev *input_dev,
struct ir_raw_event *evs,
int len)
{
+ struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+ struct decoder_data *data;
int pos = 0;
int rc = 0;
+ data = get_decoder_data(ir_dev);
+ if (!data || !data->enabled)
+ return 0;
+
while (pos < len) {
if (__ir_nec_decode(input_dev, evs, len, &pos) > 0)
rc++;
@@ -194,8 +279,54 @@ static int ir_nec_decode(struct input_dev *input_dev,
return rc;
}
+static int ir_nec_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_nec_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 nec_handler = {
- .decode = ir_nec_decode,
+ .decode = ir_nec_decode,
+ .raw_register = ir_nec_register,
+ .raw_unregister = ir_nec_unregister,
};
static int __init ir_nec_decode_init(void)
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c
index 11f23f4..371d88e 100644
--- a/drivers/media/IR/ir-raw-event.c
+++ b/drivers/media/IR/ir-raw-event.c
@@ -223,7 +223,7 @@ static void init_decoders(struct work_struct *work)
void ir_raw_init(void)
{
spin_lock_init(&ir_raw_handler_lock);
-
+
#ifdef MODULE
INIT_WORK(&wq_load, init_decoders);
schedule_work(&wq_load);
--
1.6.6.1
--
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