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 /*
  19 Driver: rti802
  20 Description: Analog Devices RTI-802
  21 Author: Anders Blomdell <anders.blomdell@control.lth.se>
  22 Devices: [Analog Devices] RTI-802 (rti802)
  23 Status: works
  24
  25 Configuration Options:
  26     [0] - i/o base
  27     [1] - unused
  28     [2] - dac#0  0=two's comp, 1=straight
  29     [3] - dac#0  0=bipolar, 1=unipolar
  30     [4] - dac#1 ...
  31     ...
  32     [17] - dac#7 ...
  33 */
  34
  35 #include "../comedidev.h"
  36
  37 #include <linux/ioport.h>
  38
  39 #define RTI802_SIZE 4
  40
  41 #define RTI802_SELECT 0
  42 #define RTI802_DATALOW 1
  43 #define RTI802_DATAHIGH 2
  44
  45 struct rti802_private {
  46         enum {
  47                 dac_2comp, dac_straight
  48         } dac_coding[8];
  49         const struct comedi_lrange *range_type_list[8];
  50         unsigned int ao_readback[8];
  51 };
  52
  53 static int rti802_ao_insn_read(struct comedi_device *dev,
  54                                struct comedi_subdevice *s,
  55                                struct comedi_insn *insn, unsigned int *data)
  56 {
  57         struct rti802_private *devpriv = dev->private;
  58         int i;
  59
  60         for (i = 0; i < insn->n; i++)
  61                 data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
  62
  63         return i;
  64 }
  65
  66 static int rti802_ao_insn_write(struct comedi_device *dev,
  67                                 struct comedi_subdevice *s,
  68                                 struct comedi_insn *insn, unsigned int *data)
  69 {
  70         struct rti802_private *devpriv = dev->private;
  71         int i, d;
  72         int chan = CR_CHAN(insn->chanspec);
  73
  74         for (i = 0; i < insn->n; i++) {
  75                 d = devpriv->ao_readback[chan] = data[i];
  76                 if (devpriv->dac_coding[chan] == dac_2comp)
  77                         d ^= 0x800;
  78                 outb(chan, dev->iobase + RTI802_SELECT);
  79                 outb(d & 0xff, dev->iobase + RTI802_DATALOW);
  80                 outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
  81         }
  82         return i;
  83 }
  84
  85 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  86 {
  87         struct rti802_private *devpriv;
  88         struct comedi_subdevice *s;
  89         int i;
  90         int ret;
  91
  92         ret = comedi_request_region(dev, it->options[0], RTI802_SIZE);
  93         if (ret)
  94                 return ret;
  95
  96         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
  97         if (!devpriv)
  98                 return -ENOMEM;
  99         dev->private = devpriv;
 100
 101         ret = comedi_alloc_subdevices(dev, 1);
 102         if (ret)
 103                 return ret;
 104
 105         s = &dev->subdevices[0];
 106         /* ao subdevice */
 107         s->type = COMEDI_SUBD_AO;
 108         s->subdev_flags = SDF_WRITABLE;
 109         s->maxdata = 0xfff;
 110         s->n_chan = 8;
 111         s->insn_read = rti802_ao_insn_read;
 112         s->insn_write = rti802_ao_insn_write;
 113         s->range_table_list = devpriv->range_type_list;
 114
 115         for (i = 0; i < 8; i++) {
 116                 devpriv->dac_coding[i] = (it->options[3 + 2 * i])
 117                     ? (dac_straight)
 118                     : (dac_2comp);
 119                 devpriv->range_type_list[i] = (it->options[2 + 2 * i])
 120                     ? &range_unipolar10 : &range_bipolar10;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static struct comedi_driver rti802_driver = {
 127         .driver_name    = "rti802",
 128         .module         = THIS_MODULE,
 129         .attach         = rti802_attach,
 130         .detach         = comedi_legacy_detach,
 131 };
 132 module_comedi_driver(rti802_driver);
 133
 134 MODULE_AUTHOR("Comedi http://www.comedi.org");
 135 MODULE_DESCRIPTION("Comedi low-level driver");
 136 MODULE_LICENSE("GPL");