MEDIA_IOC_DEVICE_INFO — Query device information
|struct media_device_info *argp|
File descriptor returned by
All media devices must support the
ioctl. To query device information, applications call the ioctl with a
pointer to a struct media_device_info. The driver fills the structure and returns
the information to the application.
The ioctl never fails.
Table L.1. struct media_device_info
Name of the driver implementing the media API as a
NUL-terminated ASCII string. The driver version is stored in the
Driver specific applications can use this information to verify the driver identity. It is also useful to work around known bugs, or to identify drivers in error reports.
|char||Device model name as a NUL-terminated UTF-8 string. The
device version is stored in the |
|char||Serial number as a NUL-terminated ASCII string.|
|char||Location of the device in the system as a NUL-terminated ASCII string. This includes the bus type name (PCI, USB, ...) and a bus-specific identifier.|
|__u32||Media API version, formatted with the
|__u32||Hardware device revision in a driver-specific format.|
|__u32||Media device driver version, formatted with the
|__u32||Reserved for future extensions. Drivers and applications must set this array to zero.|
fields can be used to distinguish between multiple instances of otherwise
identical hardware. The serial number takes precedence when provided and can
be assumed to be unique. If the serial number is an empty string, the
bus_info field can be used instead. The
bus_info field is guaranteed to be unique, but
can vary across reboots or device unplug/replug.
On success 0 is returned, on error -1 and the
errno variable is set appropriately. The generic error codes are described at the Generic Error Codes chapter.