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Diffstat (limited to 'Documentation/userspace-api/media/rc/lirc-set-rec-carrier-range.rst')
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diff --git a/Documentation/userspace-api/media/rc/lirc-set-rec-carrier-range.rst b/Documentation/userspace-api/media/rc/lirc-set-rec-carrier-range.rst new file mode 100644 index 000000000..7512dc86b --- /dev/null +++ b/Documentation/userspace-api/media/rc/lirc-set-rec-carrier-range.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later +.. c:namespace:: RC + +.. _lirc_set_rec_carrier_range: + +******************************** +ioctl LIRC_SET_REC_CARRIER_RANGE +******************************** + +Name +==== + +LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate +IR receive. + +Synopsis +======== + +.. c:macro:: LIRC_SET_REC_CARRIER_RANGE + +``int ioctl(int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency)`` + +Arguments +========= + +``fd`` + File descriptor returned by open(). + +``frequency`` + Frequency of the carrier that modulates PWM data, in Hz. + +Description +=========== + +This ioctl sets the upper range of carrier frequency that will be recognized +by the IR receiver. + +.. note:: + + To set a range use :ref:`LIRC_SET_REC_CARRIER_RANGE + <LIRC_SET_REC_CARRIER_RANGE>` with the lower bound first and later call + :ref:`LIRC_SET_REC_CARRIER <LIRC_SET_REC_CARRIER>` with the upper bound. + +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. |