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Diffstat (limited to 'Documentation/media/uapi/mediactl/media-ioc-device-info.rst')
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diff --git a/Documentation/media/uapi/mediactl/media-ioc-device-info.rst b/Documentation/media/uapi/mediactl/media-ioc-device-info.rst deleted file mode 100644 index f8038cfb708c..000000000000 --- a/Documentation/media/uapi/mediactl/media-ioc-device-info.rst +++ /dev/null @@ -1,118 +0,0 @@ -.. Permission is granted to copy, distribute and/or modify this -.. document under the terms of the GNU Free Documentation License, -.. Version 1.1 or any later version published by the Free Software -.. Foundation, with no Invariant Sections, no Front-Cover Texts -.. and no Back-Cover Texts. A copy of the license is included at -.. Documentation/media/uapi/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections - -.. _media_ioc_device_info: - -*************************** -ioctl MEDIA_IOC_DEVICE_INFO -*************************** - -Name -==== - -MEDIA_IOC_DEVICE_INFO - Query device information - - -Synopsis -======== - -.. c:function:: int ioctl( int fd, MEDIA_IOC_DEVICE_INFO, struct media_device_info *argp ) - :name: MEDIA_IOC_DEVICE_INFO - - -Arguments -========= - -``fd`` - File descriptor returned by :ref:`open() <media-func-open>`. - -``argp`` - Pointer to struct :c:type:`media_device_info`. - - -Description -=========== - -All media devices must support the ``MEDIA_IOC_DEVICE_INFO`` ioctl. To -query device information, applications call the ioctl with a pointer to -a struct :c:type:`media_device_info`. The driver -fills the structure and returns the information to the application. The -ioctl never fails. - - -.. c:type:: media_device_info - -.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}| - -.. flat-table:: struct media_device_info - :header-rows: 0 - :stub-columns: 0 - :widths: 1 1 2 - - - * - char - - ``driver``\ [16] - - Name of the driver implementing the media API as a NUL-terminated - ASCII string. The driver version is stored in the - ``driver_version`` field. - - 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 - - ``model``\ [32] - - Device model name as a NUL-terminated UTF-8 string. The device - version is stored in the ``device_version`` field and is not be - appended to the model name. - - * - char - - ``serial``\ [40] - - Serial number as a NUL-terminated ASCII string. - - * - char - - ``bus_info``\ [32] - - 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_version`` - - Media API version, formatted with the ``KERNEL_VERSION()`` macro. - - * - __u32 - - ``hw_revision`` - - Hardware device revision in a driver-specific format. - - * - __u32 - - ``driver_version`` - - Media device driver version, formatted with the - ``KERNEL_VERSION()`` macro. Together with the ``driver`` field - this identifies a particular driver. - - * - __u32 - - ``reserved``\ [31] - - Reserved for future extensions. Drivers and applications must set - this array to zero. - - -The ``serial`` and ``bus_info`` 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. - - -Return Value -============ - -On success 0 is returned, on error -1 and the ``errno`` variable is set -appropriately. The generic error codes are described at the -:ref:`Generic Error Codes <gen-errors>` chapter. |