linux/drivers/comedi/drivers/pcmda12.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * pcmda12.c
 * Driver for Winsystems PC-104 based PCM-D/A-12 8-channel AO board.
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2006 Calin A. Culianu <[email protected]>
 */

/*
 * Driver: pcmda12
 * Description: A driver for the Winsystems PCM-D/A-12
 * Devices: [Winsystems] PCM-D/A-12 (pcmda12)
 * Author: Calin Culianu <[email protected]>
 * Updated: Fri, 13 Jan 2006 12:01:01 -0500
 * Status: works
 *
 * A driver for the relatively straightforward-to-program PCM-D/A-12.
 * This board doesn't support commands, and the only way to set its
 * analog output range is to jumper the board. As such,
 * comedi_data_write() ignores the range value specified.
 *
 * The board uses 16 consecutive I/O addresses starting at the I/O port
 * base address. Each address corresponds to the LSB then MSB of a
 * particular channel from 0-7.
 *
 * Note that the board is not ISA-PNP capable and thus needs the I/O
 * port comedi_config parameter.
 *
 * Note that passing a nonzero value as the second config option will
 * enable "simultaneous xfer" mode for this board, in which AO writes
 * will not take effect until a subsequent read of any AO channel. This
 * is so that one can speed up programming by preloading all AO registers
 * with values before simultaneously setting them to take effect with one
 * read command.
 *
 * Configuration Options:
 *   [0] - I/O port base address
 *   [1] - Do Simultaneous Xfer (see description)
 */

#include <linux/module.h>
#include <linux/comedi/comedidev.h>

/* AI range is not configurable, it's set by jumpers on the board */
static const struct comedi_lrange pcmda12_ranges = …;

struct pcmda12_private { … };

static int pcmda12_ao_insn_write(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn,
				 unsigned int *data)
{ … }

static int pcmda12_ao_insn_read(struct comedi_device *dev,
				struct comedi_subdevice *s,
				struct comedi_insn *insn,
				unsigned int *data)
{ … }

static void pcmda12_ao_reset(struct comedi_device *dev,
			     struct comedi_subdevice *s)
{ … }

static int pcmda12_attach(struct comedi_device *dev,
			  struct comedi_devconfig *it)
{ … }

static struct comedi_driver pcmda12_driver = …;
module_comedi_driver(…);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;