release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/comedi/drivers/aio_aio12_8.c

   1 /*
   2
   3     comedi/drivers/aio_aio12_8.c
   4
   5     Driver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board
   6     Copyright (C) 2006 C&C Technologies, Inc.
   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
  25 Driver: aio_aio12_8
  26 Description: Acces I/O Products PC-104 AIO12-8 Analog I/O Board
  27 Author: Pablo Mejia <pablo.mejia@cctechnol.com>
  28 Devices:
  29  [Acces I/O] PC-104 AIO12-8
  30 Status: experimental
  31
  32 Configuration Options:
  33   [0] - I/O port base address
  34
  35 Notes:
  36
  37   Only synchronous operations are supported.
  38
  39 */
  40
  41 #include "../comedidev.h"
  42 #include <linux/ioport.h>
  43 #include "8255.h"
  44
  45 #define AIO12_8_STATUS                  0x00
  46 #define AIO12_8_INTERRUPT               0x01
  47 #define AIO12_8_ADC                     0x02
  48 #define AIO12_8_DAC_0                   0x04
  49 #define AIO12_8_DAC_1                   0x06
  50 #define AIO12_8_DAC_2                   0x08
  51 #define AIO12_8_DAC_3                   0x0A
  52 #define AIO12_8_COUNTER_0               0x0C
  53 #define AIO12_8_COUNTER_1               0x0D
  54 #define AIO12_8_COUNTER_2               0x0E
  55 #define AIO12_8_COUNTER_CONTROL         0x0F
  56 #define AIO12_8_DIO_0                   0x10
  57 #define AIO12_8_DIO_1                   0x11
  58 #define AIO12_8_DIO_2                   0x12
  59 #define AIO12_8_DIO_STATUS              0x13
  60 #define AIO12_8_DIO_CONTROL             0x14
  61 #define AIO12_8_ADC_TRIGGER_CONTROL     0x15
  62 #define AIO12_8_TRIGGER                 0x16
  63 #define AIO12_8_POWER                   0x17
  64
  65 #define STATUS_ADC_EOC                  0x80
  66
  67 #define ADC_MODE_NORMAL                 0x00
  68 #define ADC_MODE_INTERNAL_CLOCK         0x40
  69 #define ADC_MODE_STANDBY                0x80
  70 #define ADC_MODE_POWERDOWN              0xC0
  71
  72 #define DAC_ENABLE                      0x18
  73
  74 struct aio12_8_boardtype {
  75         const char *name;
  76 };
  77
  78 static const struct aio12_8_boardtype board_types[] = {
  79         {
  80          .name = "aio_aio12_8"},
  81 };
  82
  83 #define thisboard       ((const struct aio12_8_boardtype  *) dev->board_ptr)
  84
  85 struct aio12_8_private {
  86         unsigned int ao_readback[4];
  87 };
  88
  89 #define devpriv ((struct aio12_8_private *) dev->private)
  90
  91 static int aio_aio12_8_ai_read(struct comedi_device *dev,
  92                                struct comedi_subdevice *s,
  93                                struct comedi_insn *insn, unsigned int *data)
  94 {
  95         int n;
  96         unsigned char control =
  97             ADC_MODE_NORMAL |
  98             (CR_RANGE(insn->chanspec) << 3) | CR_CHAN(insn->chanspec);
  99
 100         /* read status to clear EOC latch */
 101         inb(dev->iobase + AIO12_8_STATUS);
 102
 103         for (n = 0; n < insn->n; n++) {
 104                 int timeout = 5;
 105
 106                 /*  Setup and start conversion */
 107                 outb(control, dev->iobase + AIO12_8_ADC);
 108
 109                 /*  Wait for conversion to complete */
 110                 while (timeout &&
 111                        !(inb(dev->iobase + AIO12_8_STATUS) & STATUS_ADC_EOC)) {
 112                         timeout--;
 113                         printk(KERN_ERR "timeout %d\n", timeout);
 114                         udelay(1);
 115                 }
 116                 if (timeout == 0) {
 117                         comedi_error(dev, "ADC timeout");
 118                         return -EIO;
 119                 }
 120
 121                 data[n] = inw(dev->iobase + AIO12_8_ADC) & 0x0FFF;
 122         }
 123         return n;
 124 }
 125
 126 static int aio_aio12_8_ao_read(struct comedi_device *dev,
 127                                struct comedi_subdevice *s,
 128                                struct comedi_insn *insn, unsigned int *data)
 129 {
 130         int i;
 131         int val = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
 132
 133         for (i = 0; i < insn->n; i++)
 134                 data[i] = val;
 135         return insn->n;
 136 }
 137
 138 static int aio_aio12_8_ao_write(struct comedi_device *dev,
 139                                 struct comedi_subdevice *s,
 140                                 struct comedi_insn *insn, unsigned int *data)
 141 {
 142         int i;
 143         int chan = CR_CHAN(insn->chanspec);
 144         unsigned long port = dev->iobase + AIO12_8_DAC_0 + (2 * chan);
 145
 146         /* enable DACs */
 147         outb(0x01, dev->iobase + DAC_ENABLE);
 148
 149         for (i = 0; i < insn->n; i++) {
 150                 outb(data[i] & 0xFF, port);     /*  LSB */
 151                 outb((data[i] >> 8) & 0x0F, port + 1);  /*  MSB */
 152                 devpriv->ao_readback[chan] = data[i];
 153         }
 154         return insn->n;
 155 }
 156
 157 static const struct comedi_lrange range_aio_aio12_8 = {
 158         4,
 159         {
 160          UNI_RANGE(5),
 161          BIP_RANGE(5),
 162          UNI_RANGE(10),
 163          BIP_RANGE(10),
 164          }
 165 };
 166
 167 static int aio_aio12_8_attach(struct comedi_device *dev,
 168                               struct comedi_devconfig *it)
 169 {
 170         int iobase;
 171         struct comedi_subdevice *s;
 172
 173         iobase = it->options[0];
 174         if (!request_region(iobase, 24, "aio_aio12_8")) {
 175                 printk(KERN_ERR "I/O port conflict");
 176                 return -EIO;
 177         }
 178
 179         dev->board_name = thisboard->name;
 180
 181         dev->iobase = iobase;
 182
 183         if (alloc_private(dev, sizeof(struct aio12_8_private)) < 0)
 184                 return -ENOMEM;
 185
 186         if (alloc_subdevices(dev, 3) < 0)
 187                 return -ENOMEM;
 188
 189         s = &dev->subdevices[0];
 190         s->type = COMEDI_SUBD_AI;
 191         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 192         s->n_chan = 8;
 193         s->maxdata = (1 << 12) - 1;
 194         s->range_table = &range_aio_aio12_8;
 195         s->insn_read = aio_aio12_8_ai_read;
 196
 197         s = &dev->subdevices[1];
 198         s->type = COMEDI_SUBD_AO;
 199         s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF;
 200         s->n_chan = 4;
 201         s->maxdata = (1 << 12) - 1;
 202         s->range_table = &range_aio_aio12_8;
 203         s->insn_read = aio_aio12_8_ao_read;
 204         s->insn_write = aio_aio12_8_ao_write;
 205
 206         s = &dev->subdevices[2];
 207         subdev_8255_init(dev, s, NULL, dev->iobase + AIO12_8_DIO_0);
 208
 209         return 0;
 210 }
 211
 212 static int aio_aio12_8_detach(struct comedi_device *dev)
 213 {
 214         subdev_8255_cleanup(dev, &dev->subdevices[2]);
 215         if (dev->iobase)
 216                 release_region(dev->iobase, 24);
 217         return 0;
 218 }
 219
 220 static struct comedi_driver driver_aio_aio12_8 = {
 221         .driver_name = "aio_aio12_8",
 222         .module = THIS_MODULE,
 223         .attach = aio_aio12_8_attach,
 224         .detach = aio_aio12_8_detach,
 225         .board_name = &board_types[0].name,
 226         .num_names = 1,
 227         .offset = sizeof(struct aio12_8_boardtype),
 228 };
 229
 230 static int __init driver_aio_aio12_8_init_module(void)
 231 {
 232         return comedi_driver_register(&driver_aio_aio12_8);
 233 }
 234
 235 static void __exit driver_aio_aio12_8_cleanup_module(void)
 236 {
 237         comedi_driver_unregister(&driver_aio_aio12_8);
 238 }
 239
 240 module_init(driver_aio_aio12_8_init_module);
 241 module_exit(driver_aio_aio12_8_cleanup_module);
 242
 243 MODULE_AUTHOR("Comedi http://www.comedi.org");
 244 MODULE_DESCRIPTION("Comedi low-level driver");
 245 MODULE_LICENSE("GPL");