release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/comedi/drivers/dt2817.c

   1 /*
   2     comedi/drivers/dt2817.c
   3     Hardware driver for Data Translation DT2817
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   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: dt2817
  25 Description: Data Translation DT2817
  26 Author: ds
  27 Status: complete
  28 Devices: [Data Translation] DT2817 (dt2817)
  29
  30 A very simple digital I/O card.  Four banks of 8 lines, each bank
  31 is configurable for input or output.  One wonders why it takes a
  32 50 page manual to describe this thing.
  33
  34 The driver (which, btw, is much less than 50 pages) has 1 subdevice
  35 with 32 channels, configurable in groups of 8.
  36
  37 Configuration options:
  38   [0] - I/O port base base address
  39 */
  40
  41 #include "../comedidev.h"
  42
  43 #include <linux/ioport.h>
  44
  45 #define DT2817_SIZE 5
  46
  47 #define DT2817_CR 0
  48 #define DT2817_DATA 1
  49
  50 static int dt2817_attach(struct comedi_device *dev,
  51                          struct comedi_devconfig *it);
  52 static int dt2817_detach(struct comedi_device *dev);
  53 static struct comedi_driver driver_dt2817 = {
  54         .driver_name = "dt2817",
  55         .module = THIS_MODULE,
  56         .attach = dt2817_attach,
  57         .detach = dt2817_detach,
  58 };
  59
  60 static int __init driver_dt2817_init_module(void)
  61 {
  62         return comedi_driver_register(&driver_dt2817);
  63 }
  64
  65 static void __exit driver_dt2817_cleanup_module(void)
  66 {
  67         comedi_driver_unregister(&driver_dt2817);
  68 }
  69
  70 module_init(driver_dt2817_init_module);
  71 module_exit(driver_dt2817_cleanup_module);
  72
  73 static int dt2817_dio_insn_config(struct comedi_device *dev,
  74                                   struct comedi_subdevice *s,
  75                                   struct comedi_insn *insn, unsigned int *data)
  76 {
  77         int mask;
  78         int chan;
  79         int oe = 0;
  80
  81         if (insn->n != 1)
  82                 return -EINVAL;
  83
  84         chan = CR_CHAN(insn->chanspec);
  85         if (chan < 8) {
  86                 mask = 0xff;
  87         } else if (chan < 16) {
  88                 mask = 0xff00;
  89         } else if (chan < 24) {
  90                 mask = 0xff0000;
  91         } else
  92                 mask = 0xff000000;
  93         if (data[0])
  94                 s->io_bits |= mask;
  95         else
  96                 s->io_bits &= ~mask;
  97
  98         if (s->io_bits & 0x000000ff)
  99                 oe |= 0x1;
 100         if (s->io_bits & 0x0000ff00)
 101                 oe |= 0x2;
 102         if (s->io_bits & 0x00ff0000)
 103                 oe |= 0x4;
 104         if (s->io_bits & 0xff000000)
 105                 oe |= 0x8;
 106
 107         outb(oe, dev->iobase + DT2817_CR);
 108
 109         return 1;
 110 }
 111
 112 static int dt2817_dio_insn_bits(struct comedi_device *dev,
 113                                 struct comedi_subdevice *s,
 114                                 struct comedi_insn *insn, unsigned int *data)
 115 {
 116         unsigned int changed;
 117
 118         /* It's questionable whether it is more important in
 119          * a driver like this to be deterministic or fast.
 120          * We choose fast. */
 121
 122         if (data[0]) {
 123                 changed = s->state;
 124                 s->state &= ~data[0];
 125                 s->state |= (data[0] & data[1]);
 126                 changed ^= s->state;
 127                 changed &= s->io_bits;
 128                 if (changed & 0x000000ff)
 129                         outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0);
 130                 if (changed & 0x0000ff00)
 131                         outb((s->state >> 8) & 0xff,
 132                              dev->iobase + DT2817_DATA + 1);
 133                 if (changed & 0x00ff0000)
 134                         outb((s->state >> 16) & 0xff,
 135                              dev->iobase + DT2817_DATA + 2);
 136                 if (changed & 0xff000000)
 137                         outb((s->state >> 24) & 0xff,
 138                              dev->iobase + DT2817_DATA + 3);
 139         }
 140         data[1] = inb(dev->iobase + DT2817_DATA + 0);
 141         data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8);
 142         data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16);
 143         data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24);
 144
 145         return 2;
 146 }
 147
 148 static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 149 {
 150         int ret;
 151         struct comedi_subdevice *s;
 152         unsigned long iobase;
 153
 154         iobase = it->options[0];
 155         printk("comedi%d: dt2817: 0x%04lx ", dev->minor, iobase);
 156         if (!request_region(iobase, DT2817_SIZE, "dt2817")) {
 157                 printk("I/O port conflict\n");
 158                 return -EIO;
 159         }
 160         dev->iobase = iobase;
 161         dev->board_name = "dt2817";
 162
 163         ret = alloc_subdevices(dev, 1);
 164         if (ret < 0)
 165                 return ret;
 166
 167         s = dev->subdevices + 0;
 168
 169         s->n_chan = 32;
 170         s->type = COMEDI_SUBD_DIO;
 171         s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 172         s->range_table = &range_digital;
 173         s->maxdata = 1;
 174         s->insn_bits = dt2817_dio_insn_bits;
 175         s->insn_config = dt2817_dio_insn_config;
 176
 177         s->state = 0;
 178         outb(0, dev->iobase + DT2817_CR);
 179
 180         printk("\n");
 181
 182         return 0;
 183 }
 184
 185 static int dt2817_detach(struct comedi_device *dev)
 186 {
 187         printk("comedi%d: dt2817: remove\n", dev->minor);
 188
 189         if (dev->iobase)
 190                 release_region(dev->iobase, DT2817_SIZE);
 191
 192         return 0;
 193 }
 194
 195 MODULE_AUTHOR("Comedi http://www.comedi.org");
 196 MODULE_DESCRIPTION("Comedi low-level driver");
 197 MODULE_LICENSE("GPL");