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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/userspace-api/media/rc/lirc-get-rec-resolution.rst | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/userspace-api/media/rc/lirc-get-rec-resolution.rst')
-rw-r--r-- | Documentation/userspace-api/media/rc/lirc-get-rec-resolution.rst | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/rc/lirc-get-rec-resolution.rst b/Documentation/userspace-api/media/rc/lirc-get-rec-resolution.rst new file mode 100644 index 000000000..e29445c5c --- /dev/null +++ b/Documentation/userspace-api/media/rc/lirc-get-rec-resolution.rst @@ -0,0 +1,47 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: RC + +.. _lirc_get_rec_resolution: + +***************************** +ioctl LIRC_GET_REC_RESOLUTION +***************************** + +Name +==== + +LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds. + +Synopsis +======== + +.. c:macro:: LIRC_GET_REC_RESOLUTION + +``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)`` + +Arguments +========= + +``fd`` + File descriptor returned by open(). + +``microseconds`` + Resolution, in microseconds. + +Description +=========== + +Some receivers have maximum resolution which is defined by internal +sample rate or data format limitations. E.g. it's common that +signals can only be reported in 50 microsecond steps. + +This ioctl returns the integer value with such resolution, with can be +used by userspace applications like lircd to automatically adjust the +tolerance value. + +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. |