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
  43 struct rti802_private {
  44         enum {
  45                 dac_2comp, dac_straight
  46         } dac_coding[8];
  47         const struct comedi_lrange *range_type_list[8];
  48 };
  49
  50 static 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
  77 static 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
 119 static struct comedi_driver rti802_driver = {
 120         .driver_name    = "rti802",
 121         .module         = THIS_MODULE,
 122         .attach         = rti802_attach,
 123         .detach         = comedi_legacy_detach,
 124 };
 125 module_comedi_driver(rti802_driver);
 126
 127 MODULE_AUTHOR("Comedi http://www.comedi.org");
 128 MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board");
 129 MODULE_LICENSE("GPL");