LXR linux/drivers/staging/comedi/drivers/rti802.c

   1/*
   2 * rti802.c
   3 * Comedi driver for Analog Devices RTI-802 board
   4 *
   5 * COMEDI - Linux Control and Measurement Device Interface
   6 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 */
  18
  19/*
  20 * Driver: rti802
  21 * Description: Analog Devices RTI-802
  22 * Author: Anders Blomdell <anders.blomdell@control.lth.se>
  23 * Devices: [Analog Devices] RTI-802 (rti802)
  24 * Status: works
  25 *
  26 * Configuration Options:
  27 *   [0] - i/o base
  28 *   [1] - unused
  29 *   [2,4,6,8,10,12,14,16] - dac#[0-7]  0=two's comp, 1=straight
  30 *   [3,5,7,9,11,13,15,17] - dac#[0-7]  0=bipolar, 1=unipolar
  31 */
  32
  33#include <linux/module.h>
  34#include "../comedidev.h"
  35
  36/*
  37 * Register I/O map
  38 */
  39#define RTI802_SELECT           0x00
  40#define RTI802_DATALOW          0x01
  41#define RTI802_DATAHIGH         0x02
  42
  43struct rti802_private {
  44        enum {
  45                dac_2comp, dac_straight
  46        } dac_coding[8];
  47        const struct comedi_lrange *range_type_list[8];
  48};
  49
  50static int rti802_ao_insn_write(struct comedi_device *dev,
  51                                struct comedi_subdevice *s,
  52                                struct comedi_insn *insn,
  53                                unsigned int *data)
  54{
  55        struct rti802_private *devpriv = dev->private;
  56        unsigned int chan = CR_CHAN(insn->chanspec);
  57        int i;
  58
  59        outb(chan, dev->iobase + RTI802_SELECT);
  60
  61        for (i = 0; i < insn->n; i++) {
  62                unsigned int val = data[i];
  63
  64                s->readback[chan] = val;
  65
  66                /* munge offset binary to two's complement if needed */
  67                if (devpriv->dac_coding[chan] == dac_2comp)
  68                        val = comedi_offset_munge(s, val);
  69
  70                outb(val & 0xff, dev->iobase + RTI802_DATALOW);
  71                outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH);
  72        }
  73
  74        return insn->n;
  75}
  76
  77static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  78{
  79        struct rti802_private *devpriv;
  80        struct comedi_subdevice *s;
  81        int i;
  82        int ret;
  83
  84        ret = comedi_request_region(dev, it->options[0], 0x04);
  85        if (ret)
  86                return ret;
  87
  88        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
  89        if (!devpriv)
  90                return -ENOMEM;
  91
  92        ret = comedi_alloc_subdevices(dev, 1);
  93        if (ret)
  94                return ret;
  95
  96        /* Analog Output subdevice */
  97        s = &dev->subdevices[0];
  98        s->type         = COMEDI_SUBD_AO;
  99        s->subdev_flags = SDF_WRITABLE;
 100        s->maxdata      = 0xfff;
 101        s->n_chan       = 8;
 102        s->insn_write   = rti802_ao_insn_write;
 103
 104        ret = comedi_alloc_subdev_readback(s);
 105        if (ret)
 106                return ret;
 107
 108        s->range_table_list = devpriv->range_type_list;
 109        for (i = 0; i < 8; i++) {
 110                devpriv->dac_coding[i] = (it->options[3 + 2 * i])
 111                        ? (dac_straight) : (dac_2comp);
 112                devpriv->range_type_list[i] = (it->options[2 + 2 * i])
 113                        ? &range_unipolar10 : &range_bipolar10;
 114        }
 115
 116        return 0;
 117}
 118
 119static struct comedi_driver rti802_driver = {
 120        .driver_name    = "rti802",
 121        .module         = THIS_MODULE,
 122        .attach         = rti802_attach,
 123        .detach         = comedi_legacy_detach,
 124};
 125module_comedi_driver(rti802_driver);
 126
 127MODULE_AUTHOR("Comedi http://www.comedi.org");
 128MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board");
 129MODULE_LICENSE("GPL");
 130