18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci.. c:namespace:: DTV.fe 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci.. _FE_GET_PROPERTY: 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci************************************** 78c2ecf20Sopenharmony_ciioctl FE_SET_PROPERTY, FE_GET_PROPERTY 88c2ecf20Sopenharmony_ci************************************** 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciName 118c2ecf20Sopenharmony_ci==== 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ciFE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties. 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ciSynopsis 168c2ecf20Sopenharmony_ci======== 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ci.. c:macro:: FE_GET_PROPERTY 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ci``int ioctl(int fd, FE_GET_PROPERTY, struct dtv_properties *argp)`` 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ci.. c:macro:: FE_SET_PROPERTY 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ci``int ioctl(int fd, FE_SET_PROPERTY, struct dtv_properties *argp)`` 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ciArguments 278c2ecf20Sopenharmony_ci========= 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci``fd`` 308c2ecf20Sopenharmony_ci File descriptor returned by :c:func:`open()`. 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci``argp`` 338c2ecf20Sopenharmony_ci Pointer to struct :c:type:`dtv_properties`. 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ciDescription 368c2ecf20Sopenharmony_ci=========== 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ciAll Digital TV frontend devices support the ``FE_SET_PROPERTY`` and 398c2ecf20Sopenharmony_ci``FE_GET_PROPERTY`` ioctls. The supported properties and statistics 408c2ecf20Sopenharmony_cidepends on the delivery system and on the device: 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ci- ``FE_SET_PROPERTY:`` 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci - This ioctl is used to set one or more frontend properties. 458c2ecf20Sopenharmony_ci 468c2ecf20Sopenharmony_ci - This is the basic command to request the frontend to tune into 478c2ecf20Sopenharmony_ci some frequency and to start decoding the digital TV signal. 488c2ecf20Sopenharmony_ci 498c2ecf20Sopenharmony_ci - This call requires read/write access to the device. 508c2ecf20Sopenharmony_ci 518c2ecf20Sopenharmony_ci.. note:: 528c2ecf20Sopenharmony_ci 538c2ecf20Sopenharmony_ci At return, the values aren't updated to reflect the actual 548c2ecf20Sopenharmony_ci parameters used. If the actual parameters are needed, an explicit 558c2ecf20Sopenharmony_ci call to ``FE_GET_PROPERTY`` is needed. 568c2ecf20Sopenharmony_ci 578c2ecf20Sopenharmony_ci- ``FE_GET_PROPERTY:`` 588c2ecf20Sopenharmony_ci 598c2ecf20Sopenharmony_ci - This ioctl is used to get properties and statistics from the 608c2ecf20Sopenharmony_ci frontend. 618c2ecf20Sopenharmony_ci 628c2ecf20Sopenharmony_ci - No properties are changed, and statistics aren't reset. 638c2ecf20Sopenharmony_ci 648c2ecf20Sopenharmony_ci - This call only requires read-only access to the device. 658c2ecf20Sopenharmony_ci 668c2ecf20Sopenharmony_ciReturn Value 678c2ecf20Sopenharmony_ci============ 688c2ecf20Sopenharmony_ci 698c2ecf20Sopenharmony_ciOn success 0 is returned. 708c2ecf20Sopenharmony_ci 718c2ecf20Sopenharmony_ciOn error -1 is returned, and the ``errno`` variable is set 728c2ecf20Sopenharmony_ciappropriately. 738c2ecf20Sopenharmony_ci 748c2ecf20Sopenharmony_ciGeneric error codes are described at the 758c2ecf20Sopenharmony_ci:ref:`Generic Error Codes <gen-errors>` chapter. 76