drivers/staging/comedi/drivers/adq12b.c

   1 /*
   2     comedi/drivers/adq12b.c
   3     driver for MicroAxial ADQ12-B data acquisition and control card
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 2000 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: adq12b
  25 Description: driver for MicroAxial ADQ12-B data acquisition and control card
  26 Devices: [MicroAxial] ADQ12-B (adq12b)
  27 Author: jeremy theler <thelerg@ib.cnea.gov.ar>
  28 Updated: Thu, 21 Feb 2008 02:56:27 -0300
  29 Status: works
  30
  31 Driver for the acquisition card ADQ12-B (without any add-on).
  32
  33  - Analog input is subdevice 0 (16 channels single-ended or 8 differential)
  34  - Digital input is subdevice 1 (5 channels)
  35  - Digital output is subdevice 1 (8 channels)
  36  - The PACER is not supported in this version
  37
  38 If you do not specify any options, they will default to
  39
  40   # comedi_config /dev/comedi0 adq12b 0x300,0,0
  41
  42   option 1: I/O base address. The following table is provided as a help
  43    of the hardware jumpers.
  44
  45          address            jumper JADR
  46           0x300                 1 (factory default)
  47           0x320                 2
  48           0x340                 3
  49           0x360                 4
  50           0x380                 5
  51           0x3A0                 6
  52
  53   option 2: unipolar/bipolar ADC selection: 0 -> bipolar, 1 -> unipolar
  54
  55         selection         comedi_config option            JUB
  56          bipolar                0                         2-3 (factory default)
  57          unipolar               1                         1-2
  58
  59   option 3: single-ended/differential AI selection: 0 -> SE, 1 -> differential
  60
  61         selection         comedi_config option     JCHA    JCHB
  62        single-ended             0                  1-2     1-2 (factory default)
  63        differential             1                  2-3     2-3
  64
  65    written by jeremy theler <thelerg@ib.cnea.gov.ar>
  66
  67    instituto balseiro
  68    comision nacional de energia atomica
  69    universidad nacional de cuyo
  70    argentina
  71
  72    21-feb-2008
  73      + changed supported devices string (missused the [] and ())
  74
  75    13-oct-2007
  76      + first try
  77
  78
  79 */
  80
  81 #include "../comedidev.h"
  82
  83 /* address scheme (page 2.17 of the manual) */
  84 #define ADQ12B_SIZE     16
  85
  86 #define ADQ12B_CTREG    0x00
  87 #define ADQ12B_STINR    0x00
  88 #define ADQ12B_OUTBR    0x04
  89 #define ADQ12B_ADLOW    0x08
  90 #define ADQ12B_ADHIG    0x09
  91 #define ADQ12B_CONT0    0x0c
  92 #define ADQ12B_CONT1    0x0d
  93 #define ADQ12B_CONT2    0x0e
  94 #define ADQ12B_COWORD   0x0f
  95
  96 /* mask of the bit at STINR to check end of conversion */
  97 #define ADQ12B_EOC     0x20
  98
  99 #define TIMEOUT        20
 100
 101 /* available ranges through the PGA gains */
 102 static const struct comedi_lrange range_adq12b_ai_bipolar = { 4, {
 103                                                                   BIP_RANGE(5),
 104                                                                   BIP_RANGE(2),
 105                                                                   BIP_RANGE(1),
 106                                                                   BIP_RANGE(0.5)
 107                                                                   }
 108 };
 109
 110 static const struct comedi_lrange range_adq12b_ai_unipolar = { 4, {
 111                                                                    UNI_RANGE(5),
 112                                                                    UNI_RANGE(2),
 113                                                                    UNI_RANGE(1),
 114                                                                    UNI_RANGE
 115                                                                    (0.5)
 116                                                                    }
 117 };
 118
 119 struct adq12b_board {
 120         const char *name;
 121         int ai_se_chans;
 122         int ai_diff_chans;
 123         int ai_bits;
 124         int di_chans;
 125         int do_chans;
 126 };
 127
 128 static const struct adq12b_board adq12b_boards[] = {
 129         {
 130          .name = "adq12b",
 131          .ai_se_chans = 16,
 132          .ai_diff_chans = 8,
 133          .ai_bits = 12,
 134          .di_chans = 5,
 135          .do_chans = 8}
 136 /* potentially, more adq-based deviced will be added */
 137 /*,
 138         .name = "adq12b",
 139         .ai_chans = 16,  // this is just for reference, hardcoded again later
 140         .ai_bits = 12,
 141         .di_chans = 8,
 142         .do_chans = 5
 143         }*/
 144 };
 145
 146 #define thisboard ((const struct adq12b_board *)dev->board_ptr)
 147
 148 struct adq12b_private {
 149         int unipolar;           /* option 2 of comedi_config (1 is iobase) */
 150         int differential;       /* option 3 of comedi_config */
 151         int last_channel;
 152         int last_range;
 153         unsigned int digital_state;
 154 };
 155
 156 #define devpriv ((struct adq12b_private *)dev->private)
 157
 158 /*
 159  * The struct comedi_driver structure tells the Comedi core module
 160  * which functions to call to configure/deconfigure (attach/detach)
 161  * the board, and also about the kernel module that contains
 162  * the device code.
 163  */
 164 static int adq12b_attach(struct comedi_device *dev,
 165                          struct comedi_devconfig *it);
 166 static int adq12b_detach(struct comedi_device *dev);
 167
 168 static struct comedi_driver driver_adq12b = {
 169         .driver_name = "adq12b",
 170         .module = THIS_MODULE,
 171         .attach = adq12b_attach,
 172         .detach = adq12b_detach,
 173         .board_name = &adq12b_boards[0].name,
 174         .offset = sizeof(struct adq12b_board),
 175         .num_names = ARRAY_SIZE(adq12b_boards),
 176 };
 177
 178 static int adq12b_ai_rinsn(struct comedi_device *dev,
 179                            struct comedi_subdevice *s, struct comedi_insn *insn,
 180                            unsigned int *data);
 181 static int adq12b_di_insn_bits(struct comedi_device *dev,
 182                                struct comedi_subdevice *s,
 183                                struct comedi_insn *insn, unsigned int *data);
 184 static int adq12b_do_insn_bits(struct comedi_device *dev,
 185                                struct comedi_subdevice *s,
 186                                struct comedi_insn *insn, unsigned int *data);
 187
 188 /*
 189  * Attach is called by the Comedi core to configure the driver
 190  * for a particular board.  If you specified a board_name array
 191  * in the driver structure, dev->board_ptr contains that
 192  * address.
 193  */
 194 static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 195 {
 196         struct comedi_subdevice *s;
 197         unsigned long iobase;
 198         int unipolar, differential;
 199
 200         iobase = it->options[0];
 201         unipolar = it->options[1];
 202         differential = it->options[2];
 203
 204         printk(KERN_INFO "comedi%d: adq12b called with options base=0x%03lx, "
 205                "%s and %s\n", dev->minor, iobase,
 206                (unipolar == 1) ? "unipolar" : "bipolar",
 207                (differential == 1) ? "differential" : "single-ended");
 208
 209         /* if no address was specified, try the default 0x300 */
 210         if (iobase == 0) {
 211                 printk(KERN_WARNING "comedi%d: adq12b warning: I/O base "
 212                        "address not specified. Trying the default 0x300.\n",
 213                        dev->minor);
 214                 iobase = 0x300;
 215         }
 216
 217         printk("comedi%d: adq12b: 0x%04lx ", dev->minor, iobase);
 218         if (!request_region(iobase, ADQ12B_SIZE, "adq12b")) {
 219                 printk("I/O port conflict\n");
 220                 return -EIO;
 221         }
 222         dev->iobase = iobase;
 223
 224 /*
 225  * Initialize dev->board_name.  Note that we can use the "thisboard"
 226  * macro now, since we just initialized it in the last line.
 227  */
 228         dev->board_name = thisboard->name;
 229
 230 /*
 231  * Allocate the private structure area.  alloc_private() is a
 232  * convenient macro defined in comedidev.h.
 233  */
 234         if (alloc_private(dev, sizeof(struct adq12b_private)) < 0)
 235                 return -ENOMEM;
 236
 237 /* fill in devpriv structure */
 238         devpriv->unipolar = unipolar;
 239         devpriv->differential = differential;
 240         devpriv->digital_state = 0;
 241 /* initialize channel and range to -1 so we make sure we always write
 242    at least once to the CTREG in the instruction */
 243         devpriv->last_channel = -1;
 244         devpriv->last_range = -1;
 245
 246 /*
 247  * Allocate the subdevice structures.  alloc_subdevice() is a
 248  * convenient macro defined in comedidev.h.
 249  */
 250         if (alloc_subdevices(dev, 3) < 0)
 251                 return -ENOMEM;
 252
 253         s = dev->subdevices + 0;
 254         /* analog input subdevice */
 255         s->type = COMEDI_SUBD_AI;
 256         if (differential) {
 257                 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 258                 s->n_chan = thisboard->ai_diff_chans;
 259         } else {
 260                 s->subdev_flags = SDF_READABLE | SDF_GROUND;
 261                 s->n_chan = thisboard->ai_se_chans;
 262         }
 263
 264         if (unipolar)
 265                 s->range_table = &range_adq12b_ai_unipolar;
 266         else
 267                 s->range_table = &range_adq12b_ai_bipolar;
 268
 269         s->maxdata = (1 << thisboard->ai_bits) - 1;
 270
 271         s->len_chanlist = 4;    /* This is the maximum chanlist length that
 272                                    the board can handle */
 273         s->insn_read = adq12b_ai_rinsn;
 274
 275         s = dev->subdevices + 1;
 276         /* digital input subdevice */
 277         s->type = COMEDI_SUBD_DI;
 278         s->subdev_flags = SDF_READABLE;
 279         s->n_chan = thisboard->di_chans;
 280         s->maxdata = 1;
 281         s->range_table = &range_digital;
 282         s->insn_bits = adq12b_di_insn_bits;
 283
 284         s = dev->subdevices + 2;
 285         /* digital output subdevice */
 286         s->type = COMEDI_SUBD_DO;
 287         s->subdev_flags = SDF_WRITABLE;
 288         s->n_chan = thisboard->do_chans;
 289         s->maxdata = 1;
 290         s->range_table = &range_digital;
 291         s->insn_bits = adq12b_do_insn_bits;
 292
 293         printk(KERN_INFO "attached\n");
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * _detach is called to deconfigure a device.  It should deallocate
 300  * resources.
 301  * This function is also called when _attach() fails, so it should be
 302  * careful not to release resources that were not necessarily
 303  * allocated by _attach().  dev->private and dev->subdevices are
 304  * deallocated automatically by the core.
 305  */
 306 static int adq12b_detach(struct comedi_device *dev)
 307 {
 308         if (dev->iobase)
 309                 release_region(dev->iobase, ADQ12B_SIZE);
 310
 311         kfree(devpriv);
 312
 313         printk(KERN_INFO "comedi%d: adq12b: removed\n", dev->minor);
 314
 315         return 0;
 316 }
 317
 318 /*
 319  * "instructions" read/write data in "one-shot" or "software-triggered"
 320  * mode.
 321  */
 322
 323 static int adq12b_ai_rinsn(struct comedi_device *dev,
 324                            struct comedi_subdevice *s, struct comedi_insn *insn,
 325                            unsigned int *data)
 326 {
 327         int n, i;
 328         int range, channel;
 329         unsigned char hi, lo, status;
 330
 331         /* change channel and range only if it is different from the previous */
 332         range = CR_RANGE(insn->chanspec);
 333         channel = CR_CHAN(insn->chanspec);
 334         if (channel != devpriv->last_channel || range != devpriv->last_range) {
 335                 outb((range << 4) | channel, dev->iobase + ADQ12B_CTREG);
 336                 udelay(50);     /* wait for the mux to settle */
 337         }
 338
 339         /* trigger conversion */
 340         status = inb(dev->iobase + ADQ12B_ADLOW);
 341
 342         /* convert n samples */
 343         for (n = 0; n < insn->n; n++) {
 344
 345                 /* wait for end of convertion */
 346                 i = 0;
 347                 do {
 348                         /* udelay(1); */
 349                         status = inb(dev->iobase + ADQ12B_STINR);
 350                         status = status & ADQ12B_EOC;
 351                 } while (status == 0 && ++i < TIMEOUT);
 352                 /* } while (++i < 10); */
 353
 354                 /* read data */
 355                 hi = inb(dev->iobase + ADQ12B_ADHIG);
 356                 lo = inb(dev->iobase + ADQ12B_ADLOW);
 357
 358                 /* printk("debug: chan=%d range=%d status=%d hi=%d lo=%d\n",
 359                        channel, range, status,  hi, lo); */
 360                 data[n] = (hi << 8) | lo;
 361
 362         }
 363
 364         /* return the number of samples read/written */
 365         return n;
 366 }
 367
 368 static int adq12b_di_insn_bits(struct comedi_device *dev,
 369                                struct comedi_subdevice *s,
 370                                struct comedi_insn *insn, unsigned int *data)
 371 {
 372
 373         /* only bits 0-4 have information about digital inputs */
 374         data[1] = (inb(dev->iobase + ADQ12B_STINR) & (0x1f));
 375
 376         return 2;
 377 }
 378
 379 static int adq12b_do_insn_bits(struct comedi_device *dev,
 380                                struct comedi_subdevice *s,
 381                                struct comedi_insn *insn, unsigned int *data)
 382 {
 383         int channel;
 384
 385         for (channel = 0; channel < 8; channel++)
 386                 if (((data[0] >> channel) & 0x01) != 0)
 387                         outb((((data[1] >> channel) & 0x01) << 3) | channel,
 388                              dev->iobase + ADQ12B_OUTBR);
 389
 390         /* store information to retrieve when asked for reading */
 391         if (data[0]) {
 392                 devpriv->digital_state &= ~data[0];
 393                 devpriv->digital_state |= (data[0] & data[1]);
 394         }
 395
 396         data[1] = devpriv->digital_state;
 397
 398         return 2;
 399 }
 400
 401 /*
 402  * A convenient macro that defines init_module() and cleanup_module(),
 403  * as necessary.
 404  */
 405 static int __init driver_adq12b_init_module(void)
 406 {
 407         return comedi_driver_register(&driver_adq12b);
 408 }
 409
 410 static void __exit driver_adq12b_cleanup_module(void)
 411 {
 412         comedi_driver_unregister(&driver_adq12b);
 413 }
 414
 415 module_init(driver_adq12b_init_module);
 416 module_exit(driver_adq12b_cleanup_module);
 417
 418 MODULE_AUTHOR("Comedi http://www.comedi.org");
 419 MODULE_DESCRIPTION("Comedi low-level driver");
 420 MODULE_LICENSE("GPL");