drivers/staging/comedi/drivers/rti802.c

   1 /*
   2    comedi/drivers/rti802.c
   3    Hardware 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    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22  */
  23 /*
  24 Driver: rti802
  25 Description: Analog Devices RTI-802
  26 Author: Anders Blomdell <anders.blomdell@control.lth.se>
  27 Devices: [Analog Devices] RTI-802 (rti802)
  28 Status: works
  29
  30 Configuration Options:
  31     [0] - i/o base
  32     [1] - unused
  33     [2] - dac#0  0=two's comp, 1=straight
  34     [3] - dac#0  0=bipolar, 1=unipolar
  35     [4] - dac#1 ...
  36     ...
  37     [17] - dac#7 ...
  38 */
  39
  40 #include "../comedidev.h"
  41
  42 #include <linux/ioport.h>
  43
  44 #define RTI802_SIZE 4
  45
  46 #define RTI802_SELECT 0
  47 #define RTI802_DATALOW 1
  48 #define RTI802_DATAHIGH 2
  49
  50 struct rti802_private {
  51         enum {
  52                 dac_2comp, dac_straight
  53         } dac_coding[8];
  54         const struct comedi_lrange *range_type_list[8];
  55         unsigned int ao_readback[8];
  56 };
  57
  58 static int rti802_ao_insn_read(struct comedi_device *dev,
  59                                struct comedi_subdevice *s,
  60                                struct comedi_insn *insn, unsigned int *data)
  61 {
  62         struct rti802_private *devpriv = dev->private;
  63         int i;
  64
  65         for (i = 0; i < insn->n; i++)
  66                 data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
  67
  68         return i;
  69 }
  70
  71 static int rti802_ao_insn_write(struct comedi_device *dev,
  72                                 struct comedi_subdevice *s,
  73                                 struct comedi_insn *insn, unsigned int *data)
  74 {
  75         struct rti802_private *devpriv = dev->private;
  76         int i, d;
  77         int chan = CR_CHAN(insn->chanspec);
  78
  79         for (i = 0; i < insn->n; i++) {
  80                 d = devpriv->ao_readback[chan] = data[i];
  81                 if (devpriv->dac_coding[chan] == dac_2comp)
  82                         d ^= 0x800;
  83                 outb(chan, dev->iobase + RTI802_SELECT);
  84                 outb(d & 0xff, dev->iobase + RTI802_DATALOW);
  85                 outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
  86         }
  87         return i;
  88 }
  89
  90 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  91 {
  92         struct rti802_private *devpriv;
  93         struct comedi_subdevice *s;
  94         int i;
  95         int ret;
  96
  97         ret = comedi_request_region(dev, it->options[0], RTI802_SIZE);
  98         if (ret)
  99                 return ret;
 100
 101         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 102         if (!devpriv)
 103                 return -ENOMEM;
 104         dev->private = devpriv;
 105
 106         ret = comedi_alloc_subdevices(dev, 1);
 107         if (ret)
 108                 return ret;
 109
 110         s = &dev->subdevices[0];
 111         /* ao subdevice */
 112         s->type = COMEDI_SUBD_AO;
 113         s->subdev_flags = SDF_WRITABLE;
 114         s->maxdata = 0xfff;
 115         s->n_chan = 8;
 116         s->insn_read = rti802_ao_insn_read;
 117         s->insn_write = rti802_ao_insn_write;
 118         s->range_table_list = devpriv->range_type_list;
 119
 120         for (i = 0; i < 8; i++) {
 121                 devpriv->dac_coding[i] = (it->options[3 + 2 * i])
 122                     ? (dac_straight)
 123                     : (dac_2comp);
 124                 devpriv->range_type_list[i] = (it->options[2 + 2 * i])
 125                     ? &range_unipolar10 : &range_bipolar10;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static struct comedi_driver rti802_driver = {
 132         .driver_name    = "rti802",
 133         .module         = THIS_MODULE,
 134         .attach         = rti802_attach,
 135         .detach         = comedi_legacy_detach,
 136 };
 137 module_comedi_driver(rti802_driver);
 138
 139 MODULE_AUTHOR("Comedi http://www.comedi.org");
 140 MODULE_DESCRIPTION("Comedi low-level driver");
 141 MODULE_LICENSE("GPL");