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 static int rti802_attach(struct comedi_device *dev,
  51                          struct comedi_devconfig *it);
  52 static int rti802_detach(struct comedi_device *dev);
  53 static struct comedi_driver driver_rti802 = {
  54         .driver_name = "rti802",
  55         .module = THIS_MODULE,
  56         .attach = rti802_attach,
  57         .detach = rti802_detach,
  58 };
  59
  60 COMEDI_INITCLEANUP(driver_rti802);
  61
  62 struct rti802_private {
  63         enum {
  64                 dac_2comp, dac_straight
  65         } dac_coding[8];
  66         const struct comedi_lrange *range_type_list[8];
  67         unsigned int ao_readback[8];
  68 };
  69
  70 #define devpriv ((struct rti802_private *)dev->private)
  71
  72 static int rti802_ao_insn_read(struct comedi_device *dev,
  73                                struct comedi_subdevice *s,
  74                                struct comedi_insn *insn, unsigned int *data)
  75 {
  76         int i;
  77
  78         for (i = 0; i < insn->n; i++)
  79                 data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
  80
  81         return i;
  82 }
  83
  84 static int rti802_ao_insn_write(struct comedi_device *dev,
  85                                 struct comedi_subdevice *s,
  86                                 struct comedi_insn *insn, unsigned int *data)
  87 {
  88         int i, d;
  89         int chan = CR_CHAN(insn->chanspec);
  90
  91         for (i = 0; i < insn->n; i++) {
  92                 d = devpriv->ao_readback[chan] = data[i];
  93                 if (devpriv->dac_coding[chan] == dac_2comp)
  94                         d ^= 0x800;
  95                 outb(chan, dev->iobase + RTI802_SELECT);
  96                 outb(d & 0xff, dev->iobase + RTI802_DATALOW);
  97                 outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
  98         }
  99         return i;
 100 }
 101
 102 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 103 {
 104         struct comedi_subdevice *s;
 105         int i;
 106         unsigned long iobase;
 107
 108         iobase = it->options[0];
 109         printk("comedi%d: rti802: 0x%04lx ", dev->minor, iobase);
 110         if (!request_region(iobase, RTI802_SIZE, "rti802")) {
 111                 printk("I/O port conflict\n");
 112                 return -EIO;
 113         }
 114         dev->iobase = iobase;
 115
 116         dev->board_name = "rti802";
 117
 118         if (alloc_subdevices(dev, 1) < 0
 119             || alloc_private(dev, sizeof(struct rti802_private))) {
 120                 return -ENOMEM;
 121         }
 122
 123         s = dev->subdevices;
 124         /* ao subdevice */
 125         s->type = COMEDI_SUBD_AO;
 126         s->subdev_flags = SDF_WRITABLE;
 127         s->maxdata = 0xfff;
 128         s->n_chan = 8;
 129         s->insn_read = rti802_ao_insn_read;
 130         s->insn_write = rti802_ao_insn_write;
 131         s->range_table_list = devpriv->range_type_list;
 132
 133         for (i = 0; i < 8; i++) {
 134                 devpriv->dac_coding[i] = (it->options[3 + 2 * i])
 135                     ? (dac_straight)
 136                     : (dac_2comp);
 137                 devpriv->range_type_list[i] = (it->options[2 + 2 * i])
 138                     ? &range_unipolar10 : &range_bipolar10;
 139         }
 140
 141         printk("\n");
 142
 143         return 0;
 144 }
 145
 146 static int rti802_detach(struct comedi_device *dev)
 147 {
 148         printk("comedi%d: rti802: remove\n", dev->minor);
 149
 150         if (dev->iobase)
 151                 release_region(dev->iobase, RTI802_SIZE);
 152
 153         return 0;
 154 }