6.5.3. ioctl LIRC_GET_FEATURES¶
6.5.3.1. Name¶
LIRC_GET_FEATURES - Get the underlying hardware device’s features
6.5.3.3. Arguments¶
fd- File descriptor returned by open().
features- Bitmask with the LIRC features.
6.5.3.4. 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.
6.5.3.5. 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.
6.5.3.6. 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.