staging: comedi: cb_pcimdda: Fix multi-line comments

/*

    comedi/drivers/cb_pcimdda.c

    Computer Boards PCIM-DDA06-16 Comedi driver

    Author: Calin Culianu <calin@ajvar.org>

    COMEDI - Linux Control and Measurement Device Interface

    Copyright (C) 2000 David A. Schleef <ds@schleef.org>

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

 * comedi/drivers/cb_pcimdda.c

 * Computer Boards PCIM-DDA06-16 Comedi driver

 * Author: Calin Culianu <calin@ajvar.org>

 *

 * COMEDI - Linux Control and Measurement Device Interface

 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

/*

Driver: cb_pcimdda

Description: Measurement Computing PCIM-DDA06-16

Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda)

Author: Calin Culianu <calin@ajvar.org>

Updated: Mon, 14 Apr 2008 15:15:51 +0100

Status: works

All features of the PCIM-DDA06-16 board are supported.  This board

has 6 16-bit AO channels, and the usual 8255 DIO setup.  (24 channels,

configurable in banks of 8 and 4, etc.).  This board does not support commands.

The board has a peculiar way of specifying AO gain/range settings -- You have

1 jumper bank on the card, which either makes all 6 AO channels either

5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.

Since there is absolutely _no_ way to tell in software how this jumper is set

(well, at least according  to the rather thin spec. from Measurement Computing

 that comes with the board), the driver assumes the jumper is at its factory

default setting of +/-5V.

Also of note is the fact that this board features another jumper, whose

state is also completely invisible to software.  It toggles two possible AO

output modes on the board:

  - Update Mode: Writing to an AO channel instantaneously updates the actual

    signal output by the DAC on the board (this is the factory default).

  - Simultaneous XFER Mode: Writing to an AO channel has no effect until

    you read from any one of the AO channels.  This is useful for loading

    all 6 AO values, and then reading from any one of the AO channels on the

    device to instantly update all 6 AO values in unison.  Useful for some

    control apps, I would assume?  If your jumper is in this setting, then you

    need to issue your comedi_data_write()s to load all the values you want,

    then issue one comedi_data_read() on any channel on the AO subdevice

    to initiate the simultaneous XFER.

Configuration Options: not applicable, uses PCI auto config

 * Driver: cb_pcimdda

 * Description: Measurement Computing PCIM-DDA06-16

 * Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda)

 * Author: Calin Culianu <calin@ajvar.org>

 * Updated: Mon, 14 Apr 2008 15:15:51 +0100

 * Status: works

 *

 * All features of the PCIM-DDA06-16 board are supported.  This board

 * has 6 16-bit AO channels, and the usual 8255 DIO setup.  (24 channels,

 * configurable in banks of 8 and 4, etc.).  This board does not support commands.

 *

 * The board has a peculiar way of specifying AO gain/range settings -- You have

 * 1 jumper bank on the card, which either makes all 6 AO channels either

 * 5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.

 *

 * Since there is absolutely _no_ way to tell in software how this jumper is set

 * (well, at least according  to the rather thin spec. from Measurement Computing

 * that comes with the board), the driver assumes the jumper is at its factory

 * default setting of +/-5V.

 *

 * Also of note is the fact that this board features another jumper, whose

 * state is also completely invisible to software.  It toggles two possible AO

 * output modes on the board:

 *

 *   - Update Mode: Writing to an AO channel instantaneously updates the actual

 *     signal output by the DAC on the board (this is the factory default).

 *   - Simultaneous XFER Mode: Writing to an AO channel has no effect until

 *     you read from any one of the AO channels.  This is useful for loading

 *     all 6 AO values, and then reading from any one of the AO channels on the

 *     device to instantly update all 6 AO values in unison.  Useful for some

 *     control apps, I would assume?  If your jumper is in this setting, then you

 *     need to issue your comedi_data_write()s to load all the values you want,

 *     then issue one comedi_data_read() on any channel on the AO subdevice

 *     to initiate the simultaneous XFER.

 *

 * Configuration Options: not applicable, uses PCI auto config

 */

/*

    This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output

    card.  This board has a unique register layout and as such probably

    deserves its own driver file.

    It is theoretically possible to integrate this board into the cb_pcidda

    file, but since that isn't my code, I didn't want to significantly

    modify that file to support this board (I thought it impolite to do so).

    At any rate, if you feel ambitious, please feel free to take

    the code out of this file and combine it with a more unified driver

    file.

    I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>

    for lending me a board so that I could write this driver.

    -Calin Culianu <calin@ajvar.org>

 * This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output

 * card.  This board has a unique register layout and as such probably

 * deserves its own driver file.

 *

 * It is theoretically possible to integrate this board into the cb_pcidda

 * file, but since that isn't my code, I didn't want to significantly

 * modify that file to support this board (I thought it impolite to do so).

 *

 * At any rate, if you feel ambitious, please feel free to take

 * the code out of this file and combine it with a more unified driver

 * file.

 *

 * I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>

 * for lending me a board so that I could write this driver.

 *

 * -Calin Culianu <calin@ajvar.org>

 */

#include <linux/module.h>