release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/comedi/drivers/das6402.c

   1 /*
   2    Some comments on the code..
   3
   4    - it shouldn't be necessary to use outb_p().
   5
   6    - ignoreirq creates a race condition.  It needs to be fixed.
   7
   8  */
   9
  10 /*
  11    comedi/drivers/das6402.c
  12    An experimental driver for Computerboards' DAS6402 I/O card
  13
  14    Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.org>
  15
  16    This program is free software; you can redistribute it and/or modify
  17    it under the terms of the GNU General Public License as published by
  18    the Free Software Foundation; either version 2 of the License, or
  19    (at your option) any later version.
  20
  21    This program is distributed in the hope that it will be useful,
  22    but WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24    GNU General Public License for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with this program; if not, write to the Free Software
  28    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29
  30  */
  31 /*
  32 Driver: das6402
  33 Description: Keithley Metrabyte DAS6402 (& compatibles)
  34 Author: Oystein Svendsen <svendsen@pvv.org>
  35 Status: bitrotten
  36 Devices: [Keithley Metrabyte] DAS6402 (das6402)
  37
  38 This driver has suffered bitrot.
  39 */
  40
  41 #include <linux/interrupt.h>
  42 #include "../comedidev.h"
  43
  44 #include <linux/ioport.h>
  45
  46 #define DAS6402_SIZE 16
  47
  48 #define N_WORDS (3000*64)
  49
  50 #define STOP    0
  51 #define START   1
  52
  53 #define SCANL 0x3f00
  54 #define BYTE unsigned char
  55 #define WORD unsigned short
  56
  57 /*----- register 8 ----*/
  58 #define CLRINT 0x01
  59 #define CLRXTR 0x02
  60 #define CLRXIN 0x04
  61 #define EXTEND 0x10
  62 #define ARMED 0x20              /* enable conting of post sample conv */
  63 #define POSTMODE 0x40
  64 #define MHZ 0x80                /* 10 MHz clock */
  65 /*---------------------*/
  66
  67 /*----- register 9 ----*/
  68 #define IRQ (0x04 << 4)         /* these two are                         */
  69 #define IRQV 10                 /*               dependent on each other */
  70
  71 #define CONVSRC 0x03            /* trig src is Intarnal pacer */
  72 #define BURSTEN 0x04            /* enable burst */
  73 #define XINTE 0x08              /* use external int. trig */
  74 #define INTE 0x80               /* enable analog interrupts */
  75 /*---------------------*/
  76
  77 /*----- register 10 ---*/
  78 #define TGEN 0x01               /* Use pin DI1 for externl trigging? */
  79 #define TGSEL 0x02              /* Use edge triggering */
  80 #define TGPOL 0x04              /* active edge is falling */
  81 #define PRETRIG 0x08            /* pretrig */
  82 /*---------------------*/
  83
  84 /*----- register 11 ---*/
  85 #define EOB 0x0c
  86 #define FIFOHFULL 0x08
  87 #define GAIN 0x01
  88 #define FIFONEPTY 0x04
  89 #define MODE 0x10
  90 #define SEM 0x20
  91 #define BIP 0x40
  92 /*---------------------*/
  93
  94 #define M0 0x00
  95 #define M2 0x04
  96
  97 #define C0 0x00
  98 #define C1 0x40
  99 #define C2 0x80
 100 #define RWLH 0x30
 101
 102 static int das6402_attach(struct comedi_device *dev,
 103                           struct comedi_devconfig *it);
 104 static int das6402_detach(struct comedi_device *dev);
 105 static struct comedi_driver driver_das6402 = {
 106         .driver_name = "das6402",
 107         .module = THIS_MODULE,
 108         .attach = das6402_attach,
 109         .detach = das6402_detach,
 110 };
 111
 112 static int __init driver_das6402_init_module(void)
 113 {
 114         return comedi_driver_register(&driver_das6402);
 115 }
 116
 117 static void __exit driver_das6402_cleanup_module(void)
 118 {
 119         comedi_driver_unregister(&driver_das6402);
 120 }
 121
 122 module_init(driver_das6402_init_module);
 123 module_exit(driver_das6402_cleanup_module);
 124
 125 struct das6402_private {
 126         int ai_bytes_to_read;
 127
 128         int das6402_ignoreirq;
 129 };
 130 #define devpriv ((struct das6402_private *)dev->private)
 131
 132 static void das6402_ai_fifo_dregs(struct comedi_device *dev,
 133                                   struct comedi_subdevice *s);
 134
 135 static void das6402_setcounter(struct comedi_device *dev)
 136 {
 137         BYTE p;
 138         unsigned short ctrlwrd;
 139
 140         /* set up counter0 first, mode 0 */
 141         p = M0 | C0 | RWLH;
 142         outb_p(p, dev->iobase + 15);
 143         ctrlwrd = 2000;
 144         p = (BYTE) (0xff & ctrlwrd);
 145         outb_p(p, dev->iobase + 12);
 146         p = (BYTE) (0xff & (ctrlwrd >> 8));
 147         outb_p(p, dev->iobase + 12);
 148
 149         /* set up counter1, mode 2 */
 150         p = M2 | C1 | RWLH;
 151         outb_p(p, dev->iobase + 15);
 152         ctrlwrd = 10;
 153         p = (BYTE) (0xff & ctrlwrd);
 154         outb_p(p, dev->iobase + 13);
 155         p = (BYTE) (0xff & (ctrlwrd >> 8));
 156         outb_p(p, dev->iobase + 13);
 157
 158         /* set up counter1, mode 2 */
 159         p = M2 | C2 | RWLH;
 160         outb_p(p, dev->iobase + 15);
 161         ctrlwrd = 1000;
 162         p = (BYTE) (0xff & ctrlwrd);
 163         outb_p(p, dev->iobase + 14);
 164         p = (BYTE) (0xff & (ctrlwrd >> 8));
 165         outb_p(p, dev->iobase + 14);
 166 }
 167
 168 static irqreturn_t intr_handler(int irq, void *d)
 169 {
 170         struct comedi_device *dev = d;
 171         struct comedi_subdevice *s = dev->subdevices;
 172
 173         if (!dev->attached || devpriv->das6402_ignoreirq) {
 174                 printk("das6402: BUG: spurious interrupt\n");
 175                 return IRQ_HANDLED;
 176         }
 177 #ifdef DEBUG
 178         printk("das6402: interrupt! das6402_irqcount=%i\n",
 179                devpriv->das6402_irqcount);
 180         printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
 181 #endif
 182
 183         das6402_ai_fifo_dregs(dev, s);
 184
 185         if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
 186                 outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
 187                 outb(0x07, dev->iobase + 8);    /* clears all flip-flops */
 188 #ifdef DEBUG
 189                 printk("das6402: Got %i samples\n\n",
 190                        devpriv->das6402_wordsread - diff);
 191 #endif
 192                 s->async->events |= COMEDI_CB_EOA;
 193                 comedi_event(dev, s);
 194         }
 195
 196         outb(0x01, dev->iobase + 8);    /* clear only the interrupt flip-flop */
 197
 198         comedi_event(dev, s);
 199         return IRQ_HANDLED;
 200 }
 201
 202
 203 static void das6402_ai_fifo_dregs(struct comedi_device *dev,
 204                                   struct comedi_subdevice *s)
 205 {
 206         while (1) {
 207                 if (!(inb(dev->iobase + 8) & 0x01))
 208                         return;
 209                 comedi_buf_put(s->async, inw(dev->iobase));
 210         }
 211 }
 212
 213 static int das6402_ai_cancel(struct comedi_device *dev,
 214                              struct comedi_subdevice *s)
 215 {
 216         /*
 217          *  This function should reset the board from whatever condition it
 218          *  is in (i.e., acquiring data), to a non-active state.
 219          */
 220
 221         devpriv->das6402_ignoreirq = 1;
 222 #ifdef DEBUG
 223         printk("das6402: Stopping acquisition\n");
 224 #endif
 225         devpriv->das6402_ignoreirq = 1;
 226         outb_p(0x02, dev->iobase + 10); /* disable external trigging */
 227         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 228         outb_p(0, dev->iobase + 9);     /* disables interrupts */
 229
 230         outw_p(SCANL, dev->iobase + 2);
 231
 232         return 0;
 233 }
 234
 235 #ifdef unused
 236 static int das6402_ai_mode2(struct comedi_device *dev,
 237                             struct comedi_subdevice *s, comedi_trig * it)
 238 {
 239         devpriv->das6402_ignoreirq = 1;
 240
 241 #ifdef DEBUG
 242         printk("das6402: Starting acquisition\n");
 243 #endif
 244         outb_p(0x03, dev->iobase + 10); /* enable external trigging */
 245         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 246         outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
 247
 248         devpriv->ai_bytes_to_read = it->n * sizeof(short);
 249
 250         /* um... ignoreirq is a nasty race condition */
 251         devpriv->das6402_ignoreirq = 0;
 252
 253         outw_p(SCANL, dev->iobase + 2);
 254
 255         return 0;
 256 }
 257 #endif
 258
 259 static int board_init(struct comedi_device *dev)
 260 {
 261         BYTE b;
 262
 263         devpriv->das6402_ignoreirq = 1;
 264
 265         outb(0x07, dev->iobase + 8);
 266
 267         /* register 11  */
 268         outb_p(MODE, dev->iobase + 11);
 269         b = BIP | SEM | MODE | GAIN | FIFOHFULL;
 270         outb_p(b, dev->iobase + 11);
 271
 272         /* register 8   */
 273         outb_p(EXTEND, dev->iobase + 8);
 274         b = EXTEND | MHZ;
 275         outb_p(b, dev->iobase + 8);
 276         b = MHZ | CLRINT | CLRXTR | CLRXIN;
 277         outb_p(b, dev->iobase + 8);
 278
 279         /* register 9    */
 280         b = IRQ | CONVSRC | BURSTEN | INTE;
 281         outb_p(b, dev->iobase + 9);
 282
 283         /* register 10   */
 284         b = TGSEL | TGEN;
 285         outb_p(b, dev->iobase + 10);
 286
 287         b = 0x07;
 288         outb_p(b, dev->iobase + 8);
 289
 290         das6402_setcounter(dev);
 291
 292         outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
 293
 294         devpriv->das6402_ignoreirq = 0;
 295
 296         return 0;
 297 }
 298
 299 static int das6402_detach(struct comedi_device *dev)
 300 {
 301         if (dev->irq)
 302                 free_irq(dev->irq, dev);
 303         if (dev->iobase)
 304                 release_region(dev->iobase, DAS6402_SIZE);
 305
 306         return 0;
 307 }
 308
 309 static int das6402_attach(struct comedi_device *dev,
 310                           struct comedi_devconfig *it)
 311 {
 312         unsigned int irq;
 313         unsigned long iobase;
 314         int ret;
 315         struct comedi_subdevice *s;
 316
 317         dev->board_name = "das6402";
 318
 319         iobase = it->options[0];
 320         if (iobase == 0)
 321                 iobase = 0x300;
 322
 323         printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase);
 324
 325         if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
 326                 printk(" I/O port conflict\n");
 327                 return -EIO;
 328         }
 329         dev->iobase = iobase;
 330
 331         /* should do a probe here */
 332
 333         irq = it->options[0];
 334         printk(" ( irq = %u )", irq);
 335         ret = request_irq(irq, intr_handler, 0, "das6402", dev);
 336         if (ret < 0) {
 337                 printk("irq conflict\n");
 338                 return ret;
 339         }
 340         dev->irq = irq;
 341
 342         ret = alloc_private(dev, sizeof(struct das6402_private));
 343         if (ret < 0)
 344                 return ret;
 345
 346         ret = alloc_subdevices(dev, 1);
 347         if (ret < 0)
 348                 return ret;
 349
 350         /* ai subdevice */
 351         s = dev->subdevices + 0;
 352         s->type = COMEDI_SUBD_AI;
 353         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 354         s->n_chan = 8;
 355         /* s->trig[2]=das6402_ai_mode2; */
 356         s->cancel = das6402_ai_cancel;
 357         s->maxdata = (1 << 12) - 1;
 358         s->len_chanlist = 16;   /* ? */
 359         s->range_table = &range_unknown;
 360
 361         board_init(dev);
 362
 363         return 0;
 364 }
 365
 366 MODULE_AUTHOR("Comedi http://www.comedi.org");
 367 MODULE_DESCRIPTION("Comedi low-level driver");
 368 MODULE_LICENSE("GPL");