6.4.3. ioctl LIRC_GET_FEATURES¶
6.4.3.1. Name¶
LIRC_GET_FEATURES - Get the underlying hardware device’s features
6.4.3.2. Synopsis¶
6.4.3.3. Arguments¶
fd
File descriptor returned by open().
features
Bitmask with the LIRC features.
6.4.3.4. 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.
6.4.3.5. LIRC features¶
LIRC_CAN_REC_RAW
Unused. Kept just to avoid breaking uAPI.
LIRC_CAN_REC_PULSE
Unused. Kept just to avoid breaking uAPI. LIRC_MODE_PULSE can only be used for transmitting.
LIRC_CAN_REC_MODE2
This is raw IR driver for receiving. This means that LIRC_MODE_MODE2 is used. This also implies that LIRC_MODE_SCANCODE is also supported, as long as the kernel is recent enough. Use the ioctls LIRC_GET_REC_MODE and LIRC_SET_REC_MODE to switch modes.
LIRC_CAN_REC_LIRCCODE
Unused. Kept just to avoid breaking uAPI.
LIRC_CAN_REC_SCANCODE
This is a scancode driver for receiving. This means that LIRC_MODE_SCANCODE is used.
LIRC_CAN_SET_SEND_CARRIER
The driver supports changing the modulation frequency via ioctl LIRC_SET_SEND_CARRIER.
LIRC_CAN_SET_SEND_DUTY_CYCLE
The driver supports changing the duty cycle using ioctl LIRC_SET_SEND_DUTY_CYCLE.
LIRC_CAN_SET_TRANSMITTER_MASK
The driver supports changing the active transmitter(s) using ioctl LIRC_SET_TRANSMITTER_MASK.
LIRC_CAN_SET_REC_CARRIER
The driver supports setting the receive carrier frequency using ioctl LIRC_SET_REC_CARRIER.
LIRC_CAN_SET_REC_DUTY_CYCLE_RANGE
Unused. Kept just to avoid breaking uAPI.
LIRC_CAN_SET_REC_CARRIER_RANGE
The driver supports ioctl LIRC_SET_REC_CARRIER_RANGE.
LIRC_CAN_GET_REC_RESOLUTION
The driver supports ioctl LIRC_GET_REC_RESOLUTION.
LIRC_CAN_SET_REC_TIMEOUT
The driver supports ioctl LIRC_SET_REC_TIMEOUT.
LIRC_CAN_SET_REC_FILTER
Unused. Kept just to avoid breaking uAPI.
LIRC_CAN_MEASURE_CARRIER
The driver supports measuring of the modulation frequency using ioctl LIRC_SET_MEASURE_CARRIER_MODE.
LIRC_CAN_USE_WIDEBAND_RECEIVER
The driver supports learning mode using ioctl LIRC_SET_WIDEBAND_RECEIVER.
LIRC_CAN_NOTIFY_DECODE
Unused. Kept just to avoid breaking uAPI.
LIRC_CAN_SEND_RAW
Unused. Kept just to avoid breaking uAPI.
LIRC_CAN_SEND_PULSE
The driver supports sending (also called as IR blasting or IR TX) using LIRC_MODE_PULSE. This implies that LIRC_MODE_SCANCODE is also supported for transmit, as long as the kernel is recent enough. Use the ioctls LIRC_GET_SEND_MODE and LIRC_SET_SEND_MODE to switch modes.
LIRC_CAN_SEND_MODE2
Unused. Kept just to avoid breaking uAPI. LIRC_MODE_MODE2 can only be used for receiving.
LIRC_CAN_SEND_LIRCCODE
Unused. Kept just to avoid breaking uAPI.
6.4.3.6. 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
Generic Error Codes chapter.