From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- .../media/uapi/rc/lirc-get-rec-resolution.rst | 47 ++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 Documentation/media/uapi/rc/lirc-get-rec-resolution.rst (limited to 'Documentation/media/uapi/rc/lirc-get-rec-resolution.rst') diff --git a/Documentation/media/uapi/rc/lirc-get-rec-resolution.rst b/Documentation/media/uapi/rc/lirc-get-rec-resolution.rst new file mode 100644 index 000000000..6e016edc2 --- /dev/null +++ b/Documentation/media/uapi/rc/lirc-get-rec-resolution.rst @@ -0,0 +1,47 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _lirc_get_rec_resolution: + +***************************** +ioctl LIRC_GET_REC_RESOLUTION +***************************** + +Name +==== + +LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds. + +Synopsis +======== + +.. c:function:: int ioctl( int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds) + :name: LIRC_GET_REC_RESOLUTION + +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 ` chapter. -- cgit v1.2.3