diff options
Diffstat (limited to '')
| -rw-r--r-- | Documentation/userspace-api/media/rc/lirc-set-rec-carrier.rst | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/rc/lirc-set-rec-carrier.rst b/Documentation/userspace-api/media/rc/lirc-set-rec-carrier.rst new file mode 100644 index 000000000000..60e321446ea7 --- /dev/null +++ b/Documentation/userspace-api/media/rc/lirc-set-rec-carrier.rst @@ -0,0 +1,46 @@ +.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later +.. c:namespace:: RC + +.. _lirc_set_rec_carrier: + +************************** +ioctl LIRC_SET_REC_CARRIER +************************** + +Name +==== + +LIRC_SET_REC_CARRIER - Set carrier used to modulate IR receive. + +Synopsis +======== + +.. c:macro:: LIRC_SET_REC_CARRIER + +``int ioctl(int fd, LIRC_SET_REC_CARRIER, __u32 *frequency)`` + +Arguments +========= + +``fd`` + File descriptor returned by open(). + +``frequency`` + Frequency of the carrier that modulates PWM data, in Hz. + +Description +=========== + +Set receive carrier used to modulate IR PWM pulses and spaces. + +.. note:: + + If called together with :ref:`LIRC_SET_REC_CARRIER_RANGE`, this ioctl + sets the upper bound frequency that will be recognized by the device. + +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. |