release/src-rt-6.x.4708/linux/linux-2.6.36/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 static int __init driver_rti802_init_module(void)
  61 {
  62         return comedi_driver_register(&driver_rti802);
  63 }
  64
  65 static void __exit driver_rti802_cleanup_module(void)
  66 {
  67         comedi_driver_unregister(&driver_rti802);
  68 }
  69
  70 module_init(driver_rti802_init_module);
  71 module_exit(driver_rti802_cleanup_module);
  72
  73 struct rti802_private {
  74         enum {
  75                 dac_2comp, dac_straight
  76         } dac_coding[8];
  77         const struct comedi_lrange *range_type_list[8];
  78         unsigned int ao_readback[8];
  79 };
  80
  81 #define devpriv ((struct rti802_private *)dev->private)
  82
  83 static int rti802_ao_insn_read(struct comedi_device *dev,
  84                                struct comedi_subdevice *s,
  85                                struct comedi_insn *insn, unsigned int *data)
  86 {
  87         int i;
  88
  89         for (i = 0; i < insn->n; i++)
  90                 data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
  91
  92         return i;
  93 }
  94
  95 static int rti802_ao_insn_write(struct comedi_device *dev,
  96                                 struct comedi_subdevice *s,
  97                                 struct comedi_insn *insn, unsigned int *data)
  98 {
  99         int i, d;
 100         int chan = CR_CHAN(insn->chanspec);
 101
 102         for (i = 0; i < insn->n; i++) {
 103                 d = devpriv->ao_readback[chan] = data[i];
 104                 if (devpriv->dac_coding[chan] == dac_2comp)
 105                         d ^= 0x800;
 106                 outb(chan, dev->iobase + RTI802_SELECT);
 107                 outb(d & 0xff, dev->iobase + RTI802_DATALOW);
 108                 outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
 109         }
 110         return i;
 111 }
 112
 113 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 114 {
 115         struct comedi_subdevice *s;
 116         int i;
 117         unsigned long iobase;
 118
 119         iobase = it->options[0];
 120         printk(KERN_INFO "comedi%d: rti802: 0x%04lx ", dev->minor, iobase);
 121         if (!request_region(iobase, RTI802_SIZE, "rti802")) {
 122                 printk(KERN_WARNING "I/O port conflict\n");
 123                 return -EIO;
 124         }
 125         dev->iobase = iobase;
 126
 127         dev->board_name = "rti802";
 128
 129         if (alloc_subdevices(dev, 1) < 0
 130             || alloc_private(dev, sizeof(struct rti802_private))) {
 131                 return -ENOMEM;
 132         }
 133
 134         s = dev->subdevices;
 135         /* ao subdevice */
 136         s->type = COMEDI_SUBD_AO;
 137         s->subdev_flags = SDF_WRITABLE;
 138         s->maxdata = 0xfff;
 139         s->n_chan = 8;
 140         s->insn_read = rti802_ao_insn_read;
 141         s->insn_write = rti802_ao_insn_write;
 142         s->range_table_list = devpriv->range_type_list;
 143
 144         for (i = 0; i < 8; i++) {
 145                 devpriv->dac_coding[i] = (it->options[3 + 2 * i])
 146                     ? (dac_straight)
 147                     : (dac_2comp);
 148                 devpriv->range_type_list[i] = (it->options[2 + 2 * i])
 149                     ? &range_unipolar10 : &range_bipolar10;
 150         }
 151
 152         return 0;
 153 }
 154
 155 static int rti802_detach(struct comedi_device *dev)
 156 {
 157         printk(KERN_INFO "comedi%d: rti802: remove\n", dev->minor);
 158
 159         if (dev->iobase)
 160                 release_region(dev->iobase, RTI802_SIZE);
 161
 162         return 0;
 163 }
 164
 165 MODULE_AUTHOR("Comedi http://www.comedi.org");
 166 MODULE_DESCRIPTION("Comedi low-level driver");
 167 MODULE_LICENSE("GPL");