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330  * comedi_buf_write_alloc() - Reserve buffer space for writing
332  * @nbytes: Maximum space to reserve in bytes.
334  * Reserve up to @nbytes bytes of space to be written in the COMEDI acquisition
336  * by the space available.
338  * Return: The amount of space reserved in bytes.
353 	 * before we write data to the write-alloc'ed buffer space  in comedi_buf_write_alloc()
363  * and kernel space
416  * comedi_buf_write_free() - Free buffer space after it is written
418  * @nbytes: Maximum space to free in bytes.
420  * Free up to @nbytes bytes of space previously reserved for writing in the
422  * space freed is limited to the amount that was reserved.  The freed space is
425  * If the samples in the freed space need to be "munged", do so here.  The
426  * freed space becomes available for allocation by the reader.
428  * Return: The amount of space freed in bytes.
450  * comedi_buf_read_n_available() - Determine amount of readable buffer space
453  * Determine the amount of readable buffer space in the COMEDI acquisition data
454  * buffer associated with the subdevice.  The readable buffer space is that
458  * Return: The amount of readable buffer space.
481  * comedi_buf_read_alloc() - Reserve buffer space for reading
483  * @nbytes: Maximum space to reserve in bytes.
485  * Reserve up to @nbytes bytes of previously written and "munged" buffer space
487  * subdevice.  The amount reserved is limited to the space available.  The
488  * reader can read from the reserved space and then free it.  A reader is also
489  * allowed to read from the space before reserving it as long as it determines
490  * the amount of readable data available, but the space needs to be marked as
493  * Return: The amount of space reserved in bytes.
509 	 * attempt to read data from the read-alloc'ed buffer space  in comedi_buf_read_alloc()
523  * comedi_buf_read_free() - Free buffer space after it has been read
525  * @nbytes: Maximum space to free in bytes.
527  * Free up to @nbytes bytes of buffer space previously reserved for reading in
529  * amount of space freed is limited to the amount that was reserved.
531  * The freed space becomes available for allocation by the writer.
533  * Return: The amount of space freed in bytes.