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V4L/DVB: ir-nec-decoder: Add sysfs node to enable/disable per irrcv

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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>
This commit is contained in:
Mauro Carvalho Chehab 2010-03-25 23:49:46 -03:00
parent 93c312ff21
commit 20d5f116ec
2 changed files with 133 additions and 2 deletions
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133
drivers/media/IR/ir-nec-decoder.c
View File

@ -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)

2
drivers/media/IR/ir-raw-event.c
View File

@ -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);