1*ac7f9d02SMauro Carvalho Chehab.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 25f536f4aSMauro Carvalho Chehab.. c:namespace:: RC 354f38fcaSMauro Carvalho Chehab 454f38fcaSMauro Carvalho Chehab.. _lirc_get_rec_resolution: 554f38fcaSMauro Carvalho Chehab 654f38fcaSMauro Carvalho Chehab***************************** 754f38fcaSMauro Carvalho Chehabioctl LIRC_GET_REC_RESOLUTION 854f38fcaSMauro Carvalho Chehab***************************** 954f38fcaSMauro Carvalho Chehab 1054f38fcaSMauro Carvalho ChehabName 1154f38fcaSMauro Carvalho Chehab==== 1254f38fcaSMauro Carvalho Chehab 1354f38fcaSMauro Carvalho ChehabLIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds. 1454f38fcaSMauro Carvalho Chehab 1554f38fcaSMauro Carvalho ChehabSynopsis 1654f38fcaSMauro Carvalho Chehab======== 1754f38fcaSMauro Carvalho Chehab 185f536f4aSMauro Carvalho Chehab.. c:macro:: LIRC_GET_REC_RESOLUTION 195f536f4aSMauro Carvalho Chehab 205f536f4aSMauro Carvalho Chehab``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)`` 2154f38fcaSMauro Carvalho Chehab 2254f38fcaSMauro Carvalho ChehabArguments 2354f38fcaSMauro Carvalho Chehab========= 2454f38fcaSMauro Carvalho Chehab 2554f38fcaSMauro Carvalho Chehab``fd`` 2654f38fcaSMauro Carvalho Chehab File descriptor returned by open(). 2754f38fcaSMauro Carvalho Chehab 2854f38fcaSMauro Carvalho Chehab``microseconds`` 2954f38fcaSMauro Carvalho Chehab Resolution, in microseconds. 3054f38fcaSMauro Carvalho Chehab 3154f38fcaSMauro Carvalho ChehabDescription 3254f38fcaSMauro Carvalho Chehab=========== 3354f38fcaSMauro Carvalho Chehab 3454f38fcaSMauro Carvalho ChehabSome receivers have maximum resolution which is defined by internal 3554f38fcaSMauro Carvalho Chehabsample rate or data format limitations. E.g. it's common that 3654f38fcaSMauro Carvalho Chehabsignals can only be reported in 50 microsecond steps. 3754f38fcaSMauro Carvalho Chehab 3854f38fcaSMauro Carvalho ChehabThis ioctl returns the integer value with such resolution, with can be 3954f38fcaSMauro Carvalho Chehabused by userspace applications like lircd to automatically adjust the 4054f38fcaSMauro Carvalho Chehabtolerance value. 4154f38fcaSMauro Carvalho Chehab 4254f38fcaSMauro Carvalho ChehabReturn Value 4354f38fcaSMauro Carvalho Chehab============ 4454f38fcaSMauro Carvalho Chehab 4554f38fcaSMauro Carvalho ChehabOn success 0 is returned, on error -1 and the ``errno`` variable is set 4654f38fcaSMauro Carvalho Chehabappropriately. The generic error codes are described at the 4754f38fcaSMauro Carvalho Chehab:ref:`Generic Error Codes <gen-errors>` chapter. 48