dt2815.c

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/*
   comedi/drivers/dt2815.c
   Hardware driver for Data Translation DT2815

   COMEDI - Linux Control and Measurement Device Interface
   Copyright (C) 1999 Anders Blomdell <[email protected]>

   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.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */
/*
Driver: dt2815
Description: Data Translation DT2815
Author: ds
Status: mostly complete, untested
Devices: [Data Translation] DT2815 (dt2815)

I'm not sure anyone has ever tested this board.  If you have information
contrary, please update.

Configuration options:
  [0] - I/O port base base address
  [1] - IRQ (unused)
  [2] - Voltage unipolar/bipolar configuration
    0 == unipolar 5V  (0V -- +5V)
    1 == bipolar 5V  (-5V -- +5V)
  [3] - Current offset configuration
    0 == disabled  (0mA -- +32mAV)
    1 == enabled  (+4mA -- +20mAV)
  [4] - Firmware program configuration
    0 == program 1 (see manual table 5-4)
    1 == program 2 (see manual table 5-4)
    2 == program 3 (see manual table 5-4)
    3 == program 4 (see manual table 5-4)
  [5] - Analog output 0 range configuration
    0 == voltage
    1 == current
  [6] - Analog output 1 range configuration (same options)
  [7] - Analog output 2 range configuration (same options)
  [8] - Analog output 3 range configuration (same options)
  [9] - Analog output 4 range configuration (same options)
  [10] - Analog output 5 range configuration (same options)
  [11] - Analog output 6 range configuration (same options)
  [12] - Analog output 7 range configuration (same options)
*/

#include "../comedidev.h"

#include <linux/ioport.h>
#include <linux/delay.h>

static const struct comedi_lrange
    range_dt2815_ao_32_current = {1, {RANGE_mA(0, 32)} };

static const struct comedi_lrange
    range_dt2815_ao_20_current = {1, {RANGE_mA(4, 20)} };

#define DT2815_SIZE 2

#define DT2815_DATA 0
#define DT2815_STATUS 1

struct dt2815_private {

    const struct comedi_lrange *range_type_list[8];
    unsigned int ao_readback[8];
};

#define devpriv ((struct dt2815_private *)dev->private)

static int dt2815_wait_for_status(struct comedi_device *dev, int status)
{
    int i;

    for (i = 0; i < 100; i++) {
        if (inb(dev->iobase + DT2815_STATUS) == status)
            break;
    }
    return status;
}

static int dt2815_ao_insn_read(struct comedi_device *dev,
                   struct comedi_subdevice *s,
                   struct comedi_insn *insn, unsigned int *data)
{
    int i;
    int chan = CR_CHAN(insn->chanspec);

    for (i = 0; i < insn->n; i++)
        data[i] = devpriv->ao_readback[chan];

    return i;
}

static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
              struct comedi_insn *insn, unsigned int *data)
{
    int i;
    int chan = CR_CHAN(insn->chanspec);
    unsigned int status;
    unsigned int lo, hi;

    for (i = 0; i < insn->n; i++) {
        lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
        hi = (data[i] & 0xff0) >> 4;

        status = dt2815_wait_for_status(dev, 0x00);
        if (status != 0) {
            printk(KERN_WARNING "dt2815: failed to write low byte "
                   "on %d reason %x\n", chan, status);
            return -EBUSY;
        }

        outb(lo, dev->iobase + DT2815_DATA);

        status = dt2815_wait_for_status(dev, 0x10);
        if (status != 0x10) {
            printk(KERN_WARNING "dt2815: failed to write high byte "
                   "on %d reason %x\n", chan, status);
            return -EBUSY;
        }
        devpriv->ao_readback[chan] = data[i];
    }
    return i;
}

/*
  options[0]   Board base address
  options[1]   IRQ (not applicable)
  options[2]   Voltage unipolar/bipolar configuration
        0 == unipolar 5V  (0V -- +5V)
        1 == bipolar 5V  (-5V -- +5V)
  options[3]   Current offset configuration
        0 == disabled  (0mA -- +32mAV)
        1 == enabled  (+4mA -- +20mAV)
  options[4]   Firmware program configuration
        0 == program 1 (see manual table 5-4)
        1 == program 2 (see manual table 5-4)
        2 == program 3 (see manual table 5-4)
        3 == program 4 (see manual table 5-4)
  options[5]   Analog output 0 range configuration
        0 == voltage
        1 == current
  options[6]   Analog output 1 range configuration
  ...
  options[12]   Analog output 7 range configuration
        0 == voltage
        1 == current
 */

static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
    struct comedi_subdevice *s;
    int i;
    const struct comedi_lrange *current_range_type, *voltage_range_type;
    unsigned long iobase;
    int ret;

    iobase = it->options[0];
    printk(KERN_INFO "comedi%d: dt2815: 0x%04lx ", dev->minor, iobase);
    if (!request_region(iobase, DT2815_SIZE, "dt2815")) {
        printk(KERN_WARNING "I/O port conflict\n");
        return -EIO;
    }

    dev->iobase = iobase;
    dev->board_name = "dt2815";

    ret = comedi_alloc_subdevices(dev, 1);
    if (ret)
        return ret;

    if (alloc_private(dev, sizeof(struct dt2815_private)) < 0)
        return -ENOMEM;

    s = &dev->subdevices[0];
    /* ao subdevice */
    s->type = COMEDI_SUBD_AO;
    s->subdev_flags = SDF_WRITABLE;
    s->maxdata = 0xfff;
    s->n_chan = 8;
    s->insn_write = dt2815_ao_insn;
    s->insn_read = dt2815_ao_insn_read;
    s->range_table_list = devpriv->range_type_list;

    current_range_type = (it->options[3])
        ? &range_dt2815_ao_20_current : &range_dt2815_ao_32_current;
    voltage_range_type = (it->options[2])
        ? &range_bipolar5 : &range_unipolar5;
    for (i = 0; i < 8; i++) {
        devpriv->range_type_list[i] = (it->options[5 + i])
            ? current_range_type : voltage_range_type;
    }

    /* Init the 2815 */
    outb(0x00, dev->iobase + DT2815_STATUS);
    for (i = 0; i < 100; i++) {
        /* This is incredibly slow (approx 20 ms) */
        unsigned int status;

        udelay(1000);
        status = inb(dev->iobase + DT2815_STATUS);
        if (status == 4) {
            unsigned int program;
            program = (it->options[4] & 0x3) << 3 | 0x7;
            outb(program, dev->iobase + DT2815_DATA);
            printk(KERN_INFO ", program: 0x%x (@t=%d)\n",
                   program, i);
            break;
        } else if (status != 0x00) {
            printk(KERN_WARNING "dt2815: unexpected status 0x%x "
                   "(@t=%d)\n", status, i);
            if (status & 0x60)
                outb(0x00, dev->iobase + DT2815_STATUS);
        }
    }

    return 0;
}

static void dt2815_detach(struct comedi_device *dev)
{
    if (dev->iobase)
        release_region(dev->iobase, DT2815_SIZE);
}

static struct comedi_driver dt2815_driver = {
    .driver_name    = "dt2815",
    .module     = THIS_MODULE,
    .attach     = dt2815_attach,
    .detach     = dt2815_detach,
};
module_comedi_driver(dt2815_driver);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");