.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later .. c:namespace:: RC .. _lirc_get_features: *********************** ioctl LIRC_GET_FEATURES *********************** Name ==== LIRC_GET_FEATURES - Get the underlying hardware device's features Synopsis ======== .. c:macro:: LIRC_GET_FEATURES ``int ioctl(int fd, LIRC_GET_FEATURES, __u32 *features)`` Arguments ========= ``fd`` File descriptor returned by open(). ``features`` Bitmask with the LIRC features. Description =========== Get the underlying hardware device's features. If a driver does not announce support of certain features, calling of the corresponding ioctls is undefined. LIRC features ============= .. _LIRC-CAN-REC-RAW: ``LIRC_CAN_REC_RAW`` Unused. Kept just to avoid breaking uAPI. .. _LIRC-CAN-REC-PULSE: ``LIRC_CAN_REC_PULSE`` Unused. Kept just to avoid breaking uAPI. :ref:`LIRC_MODE_PULSE ` can only be used for transmitting. .. _LIRC-CAN-REC-MODE2: ``LIRC_CAN_REC_MODE2`` This is raw IR driver for receiving. This means that :ref:`LIRC_MODE_MODE2 ` is used. This also implies that :ref:`LIRC_MODE_SCANCODE ` is also supported, as long as the kernel is recent enough. Use the :ref:`lirc_set_rec_mode` to switch modes. .. _LIRC-CAN-REC-LIRCCODE: ``LIRC_CAN_REC_LIRCCODE`` Unused. Kept just to avoid breaking uAPI. .. _LIRC-CAN-REC-SCANCODE: ``LIRC_CAN_REC_SCANCODE`` This is a scancode driver for receiving. This means that :ref:`LIRC_MODE_SCANCODE ` is used. .. _LIRC-CAN-SET-SEND-CARRIER: ``LIRC_CAN_SET_SEND_CARRIER`` The driver supports changing the modulation frequency via :ref:`ioctl LIRC_SET_SEND_CARRIER `. .. _LIRC-CAN-SET-SEND-DUTY-CYCLE: ``LIRC_CAN_SET_SEND_DUTY_CYCLE`` The driver supports changing the duty cycle using :ref:`ioctl LIRC_SET_SEND_DUTY_CYCLE `. .. _LIRC-CAN-SET-TRANSMITTER-MASK: ``LIRC_CAN_SET_TRANSMITTER_MASK`` The driver supports changing the active transmitter(s) using :ref:`ioctl LIRC_SET_TRANSMITTER_MASK `. .. _LIRC-CAN-SET-REC-CARRIER: ``LIRC_CAN_SET_REC_CARRIER`` The driver supports setting the receive carrier frequency using :ref:`ioctl LIRC_SET_REC_CARRIER `. .. _LIRC-CAN-SET-REC-DUTY-CYCLE-RANGE: ``LIRC_CAN_SET_REC_DUTY_CYCLE_RANGE`` Unused. Kept just to avoid breaking uAPI. .. _LIRC-CAN-SET-REC-CARRIER-RANGE: ``LIRC_CAN_SET_REC_CARRIER_RANGE`` The driver supports :ref:`ioctl LIRC_SET_REC_CARRIER_RANGE `. .. _LIRC-CAN-GET-REC-RESOLUTION: ``LIRC_CAN_GET_REC_RESOLUTION`` The driver supports :ref:`ioctl LIRC_GET_REC_RESOLUTION `. .. _LIRC-CAN-SET-REC-TIMEOUT: ``LIRC_CAN_SET_REC_TIMEOUT`` The driver supports :ref:`ioctl LIRC_SET_REC_TIMEOUT `. .. _LIRC-CAN-SET-REC-FILTER: ``LIRC_CAN_SET_REC_FILTER`` Unused. Kept just to avoid breaking uAPI. .. _LIRC-CAN-MEASURE-CARRIER: ``LIRC_CAN_MEASURE_CARRIER`` The driver supports measuring of the modulation frequency using :ref:`ioctl LIRC_SET_MEASURE_CARRIER_MODE `. .. _LIRC-CAN-USE-WIDEBAND-RECEIVER: ``LIRC_CAN_USE_WIDEBAND_RECEIVER`` The driver supports learning mode using :ref:`ioctl LIRC_SET_WIDEBAND_RECEIVER `. .. _LIRC-CAN-NOTIFY-DECODE: ``LIRC_CAN_NOTIFY_DECODE`` Unused. Kept just to avoid breaking uAPI. .. _LIRC-CAN-SEND-RAW: ``LIRC_CAN_SEND_RAW`` Unused. Kept just to avoid breaking uAPI. .. _LIRC-CAN-SEND-PULSE: ``LIRC_CAN_SEND_PULSE`` The driver supports sending (also called as IR blasting or IR TX) using :ref:`LIRC_MODE_PULSE `. This implies that :ref:`LIRC_MODE_SCANCODE ` is also supported for transmit, as long as the kernel is recent enough. Use the :ref:`lirc_set_send_mode` to switch modes. .. _LIRC-CAN-SEND-MODE2: ``LIRC_CAN_SEND_MODE2`` Unused. Kept just to avoid breaking uAPI. :ref:`LIRC_MODE_MODE2 ` can only be used for receiving. .. _LIRC-CAN-SEND-LIRCCODE: ``LIRC_CAN_SEND_LIRCCODE`` Unused. Kept just to avoid breaking uAPI. 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.