linux/comedi/comedidev.h

28  * struct comedi_subdevice - Working data for a COMEDI subdevice
29  * @device: COMEDI device to which this subdevice belongs.  (Initialized by
31  * @index: Index of this subdevice within device's array of subdevices.
33  * @type: Type of subdevice from &enum comedi_subdevice_type.  (Initialized by
35  * @n_chan: Number of channels the subdevice supports.  (Initialized by the
37  * @subdev_flags: Various "SDF" flags indicating aspects of the subdevice to
40  * @len_chanlist: Maximum length of a channel list if the subdevice supports
48  * @async: Pointer to &struct comedi_async id the subdevice supports
52  *	subdevice.  (Initially NULL.)
54  *	acquisition command on the subdevice.  (Initially NULL.)
59  * @io_bits: Bit-mask indicating the channel directions for a DIO subdevice
62  *	low-level driver for a DIO subdevice.  Forced to all-outputs during
63  *	post-configuration for a digital output subdevice.)
71  *	subdevice.  If NULL, the range table is channel-specific.  (Initialized
86  *	for a digital input, digital output or digital input/output subdevice.
92  * @do_cmd: If the subdevice supports asynchronous acquisition commands, this
95  * @do_cmdtest: If the subdevice supports asynchronous acquisition commands,
99  * @poll: If the subdevice supports asynchronous acquisition commands, this
103  * @cancel: If the subdevice supports asynchronous acquisition commands, this
106  * @buf_change: If the subdevice supports asynchronous acquisition commands,
110  * @munge: If the subdevice supports asynchronous acquisition commands and
115  * @async_dma_dir: If the subdevice supports asynchronous acquisition commands
121  *	output subdevice with no more than 32 channels. (Initialized by the
123  * @class_dev: If the subdevice supports asynchronous acquisition commands,
125  *	number of the COMEDI device and Y is the subdevice number.  The minor
128  *	with a different default read or write subdevice.  (Allocated during
138  * This is the main control structure for a COMEDI subdevice.  If the subdevice
142  * Most of the subdevice is initialized by the low-level driver's "attach" or
148  * or DIO subdevice may leave @insn_read and @insn_write uninitialized, in
509  * @read_subdev: Optional pointer to a default COMEDI subdevice operated on by
511  * @write_subdev: Optional pointer to a default COMEDI subdevice operated on by
640  * comedi_range_is_bipolar() - Test if subdevice range is bipolar
641  * @s: COMEDI subdevice.
661  * comedi_range_is_unipolar() - Test if subdevice range is unipolar
662  * @s: COMEDI subdevice.
682  * comedi_range_is_external() - Test if subdevice range is external
683  * @s: COMEDI subdevice.
704  * @s: COMEDI subdevice.
727  * @s: COMEDI subdevice.
750  * @s: COMEDI subdevice.
773  * @s: COMEDI subdevice.
788  * comedi_bytes_per_sample() - Determine subdevice sample size
789  * @s: COMEDI subdevice.
792  * whether the %SDF_LSAMPL subdevice flag is set or not.
794  * Return: The subdevice sample size.
802  * comedi_sample_shift() - Determine log2 of subdevice sample size
803  * @s: COMEDI subdevice.
806  * whether the %SDF_LSAMPL subdevice flag is set or not.  The log2 of the
810  * Return: log2 of the subdevice sample size.
819  * @s: COMEDI subdevice.
822  * Return: The number of bytes divided by the subdevice sample size.
832  * @s: COMEDI subdevice.
835  * Return: The number of samples multiplied by the subdevice sample size.
958  * @s: COMEDI subdevice.
961  * acquisition data buffer for a subdevice.  The data in question might not