release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/comedi/drivers/dt2815.c

   1 /*
   2    comedi/drivers/dt2815.c
   3    Hardware driver for Data Translation DT2815
   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: dt2815
  25 Description: Data Translation DT2815
  26 Author: ds
  27 Status: mostly complete, untested
  28 Devices: [Data Translation] DT2815 (dt2815)
  29
  30 I'm not sure anyone has ever tested this board.  If you have information
  31 contrary, please update.
  32
  33 Configuration options:
  34   [0] - I/O port base base address
  35   [1] - IRQ (unused)
  36   [2] - Voltage unipolar/bipolar configuration
  37         0 == unipolar 5V  (0V -- +5V)
  38         1 == bipolar 5V  (-5V -- +5V)
  39   [3] - Current offset configuration
  40         0 == disabled  (0mA -- +32mAV)
  41         1 == enabled  (+4mA -- +20mAV)
  42   [4] - Firmware program configuration
  43         0 == program 1 (see manual table 5-4)
  44         1 == program 2 (see manual table 5-4)
  45         2 == program 3 (see manual table 5-4)
  46         3 == program 4 (see manual table 5-4)
  47   [5] - Analog output 0 range configuration
  48         0 == voltage
  49         1 == current
  50   [6] - Analog output 1 range configuration (same options)
  51   [7] - Analog output 2 range configuration (same options)
  52   [8] - Analog output 3 range configuration (same options)
  53   [9] - Analog output 4 range configuration (same options)
  54   [10] - Analog output 5 range configuration (same options)
  55   [11] - Analog output 6 range configuration (same options)
  56   [12] - Analog output 7 range configuration (same options)
  57 */
  58
  59 #include "../comedidev.h"
  60
  61 #include <linux/ioport.h>
  62 #include <linux/delay.h>
  63
  64 static const struct comedi_lrange
  65         range_dt2815_ao_32_current = {1, {RANGE_mA(0, 32)} };
  66
  67 static const struct comedi_lrange
  68         range_dt2815_ao_20_current = {1, {RANGE_mA(4, 20)} };
  69
  70 #define DT2815_SIZE 2
  71
  72 #define DT2815_DATA 0
  73 #define DT2815_STATUS 1
  74
  75 static int dt2815_attach(struct comedi_device *dev,
  76                          struct comedi_devconfig *it);
  77 static int dt2815_detach(struct comedi_device *dev);
  78 static struct comedi_driver driver_dt2815 = {
  79         .driver_name = "dt2815",
  80         .module = THIS_MODULE,
  81         .attach = dt2815_attach,
  82         .detach = dt2815_detach,
  83 };
  84
  85 static int __init driver_dt2815_init_module(void)
  86 {
  87         return comedi_driver_register(&driver_dt2815);
  88 }
  89
  90 static void __exit driver_dt2815_cleanup_module(void)
  91 {
  92         comedi_driver_unregister(&driver_dt2815);
  93 }
  94
  95 module_init(driver_dt2815_init_module);
  96 module_exit(driver_dt2815_cleanup_module);
  97
  98 static void dt2815_free_resources(struct comedi_device *dev);
  99
 100 struct dt2815_private {
 101
 102         const struct comedi_lrange *range_type_list[8];
 103         unsigned int ao_readback[8];
 104 };
 105
 106 #define devpriv ((struct dt2815_private *)dev->private)
 107
 108 static int dt2815_wait_for_status(struct comedi_device *dev, int status)
 109 {
 110         int i;
 111
 112         for (i = 0; i < 100; i++) {
 113                 if (inb(dev->iobase + DT2815_STATUS) == status)
 114                         break;
 115         }
 116         return status;
 117 }
 118
 119 static int dt2815_ao_insn_read(struct comedi_device *dev,
 120                                struct comedi_subdevice *s,
 121                                struct comedi_insn *insn, unsigned int *data)
 122 {
 123         int i;
 124         int chan = CR_CHAN(insn->chanspec);
 125
 126         for (i = 0; i < insn->n; i++)
 127                 data[i] = devpriv->ao_readback[chan];
 128
 129         return i;
 130 }
 131
 132 static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
 133                           struct comedi_insn *insn, unsigned int *data)
 134 {
 135         int i;
 136         int chan = CR_CHAN(insn->chanspec);
 137         unsigned int status;
 138         unsigned int lo, hi;
 139
 140         for (i = 0; i < insn->n; i++) {
 141                 lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
 142                 hi = (data[i] & 0xff0) >> 4;
 143
 144                 status = dt2815_wait_for_status(dev, 0x00);
 145                 if (status != 0) {
 146                         printk(KERN_WARNING "dt2815: failed to write low byte "
 147                                "on %d reason %x\n", chan, status);
 148                         return -EBUSY;
 149                 }
 150
 151                 outb(lo, dev->iobase + DT2815_DATA);
 152
 153                 status = dt2815_wait_for_status(dev, 0x10);
 154                 if (status != 0x10) {
 155                         printk(KERN_WARNING "dt2815: failed to write high byte "
 156                                "on %d reason %x\n", chan, status);
 157                         return -EBUSY;
 158                 }
 159                 devpriv->ao_readback[chan] = data[i];
 160         }
 161         return i;
 162 }
 163
 164 /*
 165   options[0]   Board base address
 166   options[1]   IRQ (not applicable)
 167   options[2]   Voltage unipolar/bipolar configuration
 168                 0 == unipolar 5V  (0V -- +5V)
 169                 1 == bipolar 5V  (-5V -- +5V)
 170   options[3]   Current offset configuration
 171                 0 == disabled  (0mA -- +32mAV)
 172                 1 == enabled  (+4mA -- +20mAV)
 173   options[4]   Firmware program configuration
 174                 0 == program 1 (see manual table 5-4)
 175                 1 == program 2 (see manual table 5-4)
 176                 2 == program 3 (see manual table 5-4)
 177                 3 == program 4 (see manual table 5-4)
 178   options[5]   Analog output 0 range configuration
 179                 0 == voltage
 180                 1 == current
 181   options[6]   Analog output 1 range configuration
 182   ...
 183   options[12]   Analog output 7 range configuration
 184                 0 == voltage
 185                 1 == current
 186  */
 187
 188 static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 189 {
 190         struct comedi_subdevice *s;
 191         int i;
 192         const struct comedi_lrange *current_range_type, *voltage_range_type;
 193         unsigned long iobase;
 194
 195         iobase = it->options[0];
 196         printk(KERN_INFO "comedi%d: dt2815: 0x%04lx ", dev->minor, iobase);
 197         if (!request_region(iobase, DT2815_SIZE, "dt2815")) {
 198                 printk(KERN_WARNING "I/O port conflict\n");
 199                 return -EIO;
 200         }
 201
 202         dev->iobase = iobase;
 203         dev->board_name = "dt2815";
 204
 205         if (alloc_subdevices(dev, 1) < 0)
 206                 return -ENOMEM;
 207         if (alloc_private(dev, sizeof(struct dt2815_private)) < 0)
 208                 return -ENOMEM;
 209
 210         s = dev->subdevices;
 211         /* ao subdevice */
 212         s->type = COMEDI_SUBD_AO;
 213         s->subdev_flags = SDF_WRITABLE;
 214         s->maxdata = 0xfff;
 215         s->n_chan = 8;
 216         s->insn_write = dt2815_ao_insn;
 217         s->insn_read = dt2815_ao_insn_read;
 218         s->range_table_list = devpriv->range_type_list;
 219
 220         current_range_type = (it->options[3])
 221             ? &range_dt2815_ao_20_current : &range_dt2815_ao_32_current;
 222         voltage_range_type = (it->options[2])
 223             ? &range_bipolar5 : &range_unipolar5;
 224         for (i = 0; i < 8; i++) {
 225                 devpriv->range_type_list[i] = (it->options[5 + i])
 226                     ? current_range_type : voltage_range_type;
 227         }
 228
 229         /* Init the 2815 */
 230         outb(0x00, dev->iobase + DT2815_STATUS);
 231         for (i = 0; i < 100; i++) {
 232                 /* This is incredibly slow (approx 20 ms) */
 233                 unsigned int status;
 234
 235                 udelay(1000);
 236                 status = inb(dev->iobase + DT2815_STATUS);
 237                 if (status == 4) {
 238                         unsigned int program;
 239                         program = (it->options[4] & 0x3) << 3 | 0x7;
 240                         outb(program, dev->iobase + DT2815_DATA);
 241                         printk(KERN_INFO ", program: 0x%x (@t=%d)\n",
 242                                program, i);
 243                         break;
 244                 } else if (status != 0x00) {
 245                         printk(KERN_WARNING "dt2815: unexpected status 0x%x "
 246                                "(@t=%d)\n", status, i);
 247                         if (status & 0x60)
 248                                 outb(0x00, dev->iobase + DT2815_STATUS);
 249                 }
 250         }
 251
 252         return 0;
 253 }
 254
 255 static void dt2815_free_resources(struct comedi_device *dev)
 256 {
 257         if (dev->iobase)
 258                 release_region(dev->iobase, DT2815_SIZE);
 259 }
 260
 261 static int dt2815_detach(struct comedi_device *dev)
 262 {
 263         printk(KERN_INFO "comedi%d: dt2815: remove\n", dev->minor);
 264
 265         dt2815_free_resources(dev);
 266
 267         return 0;
 268 }
 269
 270 MODULE_AUTHOR("Comedi http://www.comedi.org");
 271 MODULE_DESCRIPTION("Comedi low-level driver");
 272 MODULE_LICENSE("GPL");