diff options
Diffstat (limited to 'include/media/v4l2-device.h')
| -rw-r--r-- | include/media/v4l2-device.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h index 0dd3e8e8653..5d5d550e63a 100644 --- a/include/media/v4l2-device.h +++ b/include/media/v4l2-device.h @@ -30,7 +30,7 @@ basic V4L2 device-level support. */ -#define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16) +#define V4L2_DEVICE_NAME_SIZE (20 + 16) struct v4l2_device { /* dev->driver_data points to this struct. @@ -53,10 +53,31 @@ struct v4l2_device { dev may be NULL in rare cases (ISA devices). In that case you must fill in the v4l2_dev->name field before calling this function. */ int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); + +/* Optional function to initialize the name field of struct v4l2_device using + the driver name and a driver-global atomic_t instance. + This function will increment the instance counter and returns the instance + value used in the name. + + Example: + + static atomic_t drv_instance = ATOMIC_INIT(0); + + ... + + instance = v4l2_device_set_name(&v4l2_dev, "foo", &drv_instance); + + The first time this is called the name field will be set to foo0 and + this function returns 0. If the name ends with a digit (e.g. cx18), + then the name will be set to cx18-0 since cx180 looks really odd. */ +int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, + atomic_t *instance); + /* Set v4l2_dev->dev to NULL. Call when the USB parent disconnects. Since the parent disappears this ensures that v4l2_dev doesn't have an invalid parent pointer. */ void v4l2_device_disconnect(struct v4l2_device *v4l2_dev); + /* Unregister all sub-devices and any other resources related to v4l2_dev. */ void v4l2_device_unregister(struct v4l2_device *v4l2_dev); |