V4L/DVB: ir-nec-decoder: Add sysfs node to enable/disable per irrcv
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@redhat.com>
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93c312ff21
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20d5f116ec
2 changed files with 133 additions and 2 deletions
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@ -39,6 +39,85 @@
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#define REPEAT_TIME 240 /* ms */
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/* Used to register nec_decoder clients */
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static LIST_HEAD(decoder_list);
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static spinlock_t decoder_lock;
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struct decoder_data {
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struct list_head list;
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struct ir_input_dev *ir_dev;
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int enabled:1;
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};
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/**
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* get_decoder_data() - gets decoder data
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* @input_dev: input device
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*
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* Returns the struct decoder_data that corresponds to a device
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*/
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static struct decoder_data *get_decoder_data(struct ir_input_dev *ir_dev)
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{
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struct decoder_data *data = NULL;
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spin_lock(&decoder_lock);
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list_for_each_entry(data, &decoder_list, list) {
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if (data->ir_dev == ir_dev)
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break;
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}
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spin_unlock(&decoder_lock);
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return data;
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}
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static ssize_t store_enabled(struct device *d,
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struct device_attribute *mattr,
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const char *buf,
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size_t len)
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{
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unsigned long value;
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struct ir_input_dev *ir_dev = dev_get_drvdata(d);
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struct decoder_data *data = get_decoder_data(ir_dev);
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if (!data)
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return -EINVAL;
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if (strict_strtoul(buf, 10, &value) || value > 1)
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return -EINVAL;
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data->enabled = value;
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return len;
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}
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static ssize_t show_enabled(struct device *d,
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struct device_attribute *mattr, char *buf)
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{
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struct ir_input_dev *ir_dev = dev_get_drvdata(d);
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struct decoder_data *data = get_decoder_data(ir_dev);
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if (!data)
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return -EINVAL;
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if (data->enabled)
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return sprintf(buf, "1\n");
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else
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return sprintf(buf, "0\n");
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}
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static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled);
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static struct attribute *decoder_attributes[] = {
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&dev_attr_enabled.attr,
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NULL
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};
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static struct attribute_group decoder_attribute_group = {
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.name = "nec_decoder",
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.attrs = decoder_attributes,
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};
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/** is_repeat - Check if it is a NEC repeat event
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* @input_dev: the struct input_dev descriptor of the device
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* @pos: the position of the first event
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@ -184,9 +263,15 @@ static int ir_nec_decode(struct input_dev *input_dev,
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struct ir_raw_event *evs,
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int len)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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struct decoder_data *data;
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int pos = 0;
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int rc = 0;
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data = get_decoder_data(ir_dev);
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if (!data || !data->enabled)
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return 0;
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while (pos < len) {
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if (__ir_nec_decode(input_dev, evs, len, &pos) > 0)
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rc++;
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@ -194,8 +279,54 @@ static int ir_nec_decode(struct input_dev *input_dev,
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return rc;
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}
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static int ir_nec_register(struct input_dev *input_dev)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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struct decoder_data *data;
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int rc;
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rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
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if (rc < 0)
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return rc;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data) {
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sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
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return -ENOMEM;
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}
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data->ir_dev = ir_dev;
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data->enabled = 1;
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spin_lock(&decoder_lock);
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list_add_tail(&data->list, &decoder_list);
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spin_unlock(&decoder_lock);
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return 0;
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}
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static int ir_nec_unregister(struct input_dev *input_dev)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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static struct decoder_data *data;
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data = get_decoder_data(ir_dev);
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if (!data)
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return 0;
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sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
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spin_lock(&decoder_lock);
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list_del(&data->list);
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spin_unlock(&decoder_lock);
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return 0;
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}
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static struct ir_raw_handler nec_handler = {
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.decode = ir_nec_decode,
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.decode = ir_nec_decode,
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.raw_register = ir_nec_register,
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.raw_unregister = ir_nec_unregister,
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};
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static int __init ir_nec_decode_init(void)
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@ -223,7 +223,7 @@ static void init_decoders(struct work_struct *work)
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void ir_raw_init(void)
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{
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spin_lock_init(&ir_raw_handler_lock);
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#ifdef MODULE
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INIT_WORK(&wq_load, init_decoders);
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schedule_work(&wq_load);
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