1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 .. c:namespace:: DTV.fe 3 4 .. _FE_GET_INFO: 5 6 ***************** 7 ioctl FE_GET_INFO 8 ***************** 9 10 Name 11 ==== 12 13 FE_GET_INFO - Query Digital TV frontend capabilities and returns information 14 about the - front-end. This call only requires read-only access to the device. 15 16 Synopsis 17 ======== 18 19 .. c:macro:: FE_GET_INFO 20 21 ``int ioctl(int fd, FE_GET_INFO, struct dvb_frontend_info *argp)`` 22 23 Arguments 24 ========= 25 26 ``fd`` 27 File descriptor returned by :c:func:`open()`. 28 29 ``argp`` 30 pointer to struct :c:type:`dvb_frontend_info` 31 32 Description 33 =========== 34 35 All Digital TV frontend devices support the :ref:`FE_GET_INFO` ioctl. It is 36 used to identify kernel devices compatible with this specification and to 37 obtain information about driver and hardware capabilities. The ioctl 38 takes a pointer to dvb_frontend_info which is filled by the driver. 39 When the driver is not compatible with this specification the ioctl 40 returns an error. 41 42 frontend capabilities 43 ===================== 44 45 Capabilities describe what a frontend can do. Some capabilities are 46 supported only on some specific frontend types. 47 48 The frontend capabilities are described at :c:type:`fe_caps`. 49 50 Return Value 51 ============ 52 53 On success 0 is returned. 54 55 On error -1 is returned, and the ``errno`` variable is set 56 appropriately. 57 58 Generic error codes are described at the 59 :ref:`Generic Error Codes <gen-errors>` chapter.
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