1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1. 1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
2 .. c:namespace:: RC 2 .. c:namespace:: RC
3 3
4 .. _lirc_get_rec_resolution: 4 .. _lirc_get_rec_resolution:
5 5
6 ***************************** 6 *****************************
7 ioctl LIRC_GET_REC_RESOLUTION 7 ioctl LIRC_GET_REC_RESOLUTION
8 ***************************** 8 *****************************
9 9
10 Name 10 Name
11 ==== 11 ====
12 12
13 LIRC_GET_REC_RESOLUTION - Obtain the value of 13 LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds.
14 14
15 Synopsis 15 Synopsis
16 ======== 16 ========
17 17
18 .. c:macro:: LIRC_GET_REC_RESOLUTION 18 .. c:macro:: LIRC_GET_REC_RESOLUTION
19 19
20 ``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, _ 20 ``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)``
21 21
22 Arguments 22 Arguments
23 ========= 23 =========
24 24
25 ``fd`` 25 ``fd``
26 File descriptor returned by open(). 26 File descriptor returned by open().
27 27
28 ``microseconds`` 28 ``microseconds``
29 Resolution, in microseconds. 29 Resolution, in microseconds.
30 30
31 Description 31 Description
32 =========== 32 ===========
33 33
34 Some receivers have maximum resolution which i 34 Some receivers have maximum resolution which is defined by internal
35 sample rate or data format limitations. E.g. i 35 sample rate or data format limitations. E.g. it's common that
36 signals can only be reported in 50 microsecond 36 signals can only be reported in 50 microsecond steps.
37 37
38 This ioctl returns the integer value with such 38 This ioctl returns the integer value with such resolution, with can be
39 used by userspace applications like lircd to a 39 used by userspace applications like lircd to automatically adjust the
40 tolerance value. 40 tolerance value.
41 41
42 Return Value 42 Return Value
43 ============ 43 ============
44 44
45 On success 0 is returned, on error -1 and the 45 On success 0 is returned, on error -1 and the ``errno`` variable is set
46 appropriately. The generic error codes are des 46 appropriately. The generic error codes are described at the
47 :ref:`Generic Error Codes <gen-errors>` chapte 47 :ref:`Generic Error Codes <gen-errors>` chapter.
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