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 "../comedidev.h"
  42
  43 #include <linux/ioport.h>
  44
  45 #define DAS6402_SIZE 16
  46
  47 #define N_WORDS 3000*64
  48
  49 #define STOP    0
  50 #define START   1
  51
  52 #define SCANL 0x3f00
  53 #define BYTE unsigned char
  54 #define WORD unsigned short
  55
  56 /*----- register 8 ----*/
  57 #define CLRINT 0x01
  58 #define CLRXTR 0x02
  59 #define CLRXIN 0x04
  60 #define EXTEND 0x10
  61 #define ARMED 0x20              /* enable conting of post sample conv */
  62 #define POSTMODE 0x40
  63 #define MHZ 0x80                /* 10 MHz clock */
  64 /*---------------------*/
  65
  66 /*----- register 9 ----*/
  67 #define IRQ (0x04 << 4)         /* these two are                         */
  68 #define IRQV 10                 /*               dependent on each other */
  69
  70 #define CONVSRC 0x03            /* trig src is Intarnal pacer */
  71 #define BURSTEN 0x04            /* enable burst */
  72 #define XINTE 0x08              /* use external int. trig */
  73 #define INTE 0x80               /* enable analog interrupts */
  74 /*---------------------*/
  75
  76 /*----- register 10 ---*/
  77 #define TGEN 0x01               /* Use pin DI1 for externl trigging? */
  78 #define TGSEL 0x02              /* Use edge triggering */
  79 #define TGPOL 0x04              /* active edge is falling */
  80 #define PRETRIG 0x08            /* pretrig */
  81 /*---------------------*/
  82
  83 /*----- register 11 ---*/
  84 #define EOB 0x0c
  85 #define FIFOHFULL 0x08
  86 #define GAIN 0x01
  87 #define FIFONEPTY 0x04
  88 #define MODE 0x10
  89 #define SEM 0x20
  90 #define BIP 0x40
  91 /*---------------------*/
  92
  93 #define M0 0x00
  94 #define M2 0x04
  95
  96 #define C0 0x00
  97 #define C1 0x40
  98 #define C2 0x80
  99 #define RWLH 0x30
 100
 101 static int das6402_attach(struct comedi_device * dev, struct comedi_devconfig * it);
 102 static int das6402_detach(struct comedi_device * dev);
 103 static struct comedi_driver driver_das6402 = {
 104       driver_name:"das6402",
 105       module:THIS_MODULE,
 106       attach:das6402_attach,
 107       detach:das6402_detach,
 108 };
 109
 110 COMEDI_INITCLEANUP(driver_das6402);
 111
 112 struct das6402_private {
 113         int ai_bytes_to_read;
 114
 115         int das6402_ignoreirq;
 116 };
 117 #define devpriv ((struct das6402_private *)dev->private)
 118
 119 static void das6402_ai_fifo_dregs(struct comedi_device * dev, struct comedi_subdevice * s);
 120
 121 static void das6402_setcounter(struct comedi_device * dev)
 122 {
 123         BYTE p;
 124         unsigned short ctrlwrd;
 125
 126         /* set up counter0 first, mode 0 */
 127         p = M0 | C0 | RWLH;
 128         outb_p(p, dev->iobase + 15);
 129         ctrlwrd = 2000;
 130         p = (BYTE) (0xff & ctrlwrd);
 131         outb_p(p, dev->iobase + 12);
 132         p = (BYTE) (0xff & (ctrlwrd >> 8));
 133         outb_p(p, dev->iobase + 12);
 134
 135         /* set up counter1, mode 2 */
 136         p = M2 | C1 | RWLH;
 137         outb_p(p, dev->iobase + 15);
 138         ctrlwrd = 10;
 139         p = (BYTE) (0xff & ctrlwrd);
 140         outb_p(p, dev->iobase + 13);
 141         p = (BYTE) (0xff & (ctrlwrd >> 8));
 142         outb_p(p, dev->iobase + 13);
 143
 144         /* set up counter1, mode 2 */
 145         p = M2 | C2 | RWLH;
 146         outb_p(p, dev->iobase + 15);
 147         ctrlwrd = 1000;
 148         p = (BYTE) (0xff & ctrlwrd);
 149         outb_p(p, dev->iobase + 14);
 150         p = (BYTE) (0xff & (ctrlwrd >> 8));
 151         outb_p(p, dev->iobase + 14);
 152 }
 153
 154 static irqreturn_t intr_handler(int irq, void *d)
 155 {
 156         struct comedi_device *dev = d;
 157         struct comedi_subdevice *s = dev->subdevices;
 158
 159         if (!dev->attached || devpriv->das6402_ignoreirq) {
 160                 printk("das6402: BUG: spurious interrupt\n");
 161                 return IRQ_HANDLED;
 162         }
 163 #ifdef DEBUG
 164         printk("das6402: interrupt! das6402_irqcount=%i\n",
 165                 devpriv->das6402_irqcount);
 166         printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
 167 #endif
 168
 169         das6402_ai_fifo_dregs(dev, s);
 170
 171         if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
 172                 outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
 173                 outb(0x07, dev->iobase + 8);    /* clears all flip-flops */
 174 #ifdef DEBUG
 175                 printk("das6402: Got %i samples\n\n",
 176                         devpriv->das6402_wordsread - diff);
 177 #endif
 178                 s->async->events |= COMEDI_CB_EOA;
 179                 comedi_event(dev, s);
 180         }
 181
 182         outb(0x01, dev->iobase + 8);    /* clear only the interrupt flip-flop */
 183
 184         comedi_event(dev, s);
 185         return IRQ_HANDLED;
 186 }
 187
 188 #if 0
 189 static void das6402_ai_fifo_read(struct comedi_device * dev, short * data, int n)
 190 {
 191         int i;
 192
 193         for (i = 0; i < n; i++)
 194                 data[i] = inw(dev->iobase);
 195 }
 196 #endif
 197
 198 static void das6402_ai_fifo_dregs(struct comedi_device * dev, struct comedi_subdevice * s)
 199 {
 200         while (1) {
 201                 if (!(inb(dev->iobase + 8) & 0x01))
 202                         return;
 203                 comedi_buf_put(s->async, inw(dev->iobase));
 204         }
 205 }
 206
 207 static int das6402_ai_cancel(struct comedi_device * dev, struct comedi_subdevice * s)
 208 {
 209         /*
 210          *  This function should reset the board from whatever condition it
 211          *  is in (i.e., acquiring data), to a non-active state.
 212          */
 213
 214         devpriv->das6402_ignoreirq = 1;
 215 #ifdef DEBUG
 216         printk("das6402: Stopping acquisition\n");
 217 #endif
 218         devpriv->das6402_ignoreirq = 1;
 219         outb_p(0x02, dev->iobase + 10); /* disable external trigging */
 220         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 221         outb_p(0, dev->iobase + 9);     /* disables interrupts */
 222
 223         outw_p(SCANL, dev->iobase + 2);
 224
 225         return 0;
 226 }
 227
 228 #ifdef unused
 229 static int das6402_ai_mode2(struct comedi_device * dev, struct comedi_subdevice * s,
 230         comedi_trig * it)
 231 {
 232         devpriv->das6402_ignoreirq = 1;
 233
 234 #ifdef DEBUG
 235         printk("das6402: Starting acquisition\n");
 236 #endif
 237         outb_p(0x03, dev->iobase + 10); /* enable external trigging */
 238         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 239         outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
 240
 241         devpriv->ai_bytes_to_read = it->n * sizeof(short);
 242
 243         /* um... ignoreirq is a nasty race condition */
 244         devpriv->das6402_ignoreirq = 0;
 245
 246         outw_p(SCANL, dev->iobase + 2);
 247
 248         return 0;
 249 }
 250 #endif
 251
 252 static int board_init(struct comedi_device * dev)
 253 {
 254         BYTE b;
 255
 256         devpriv->das6402_ignoreirq = 1;
 257
 258         outb(0x07, dev->iobase + 8);
 259
 260         /* register 11  */
 261         outb_p(MODE, dev->iobase + 11);
 262         b = BIP | SEM | MODE | GAIN | FIFOHFULL;
 263         outb_p(b, dev->iobase + 11);
 264
 265         /* register 8   */
 266         outb_p(EXTEND, dev->iobase + 8);
 267         b = EXTEND | MHZ;
 268         outb_p(b, dev->iobase + 8);
 269         b = MHZ | CLRINT | CLRXTR | CLRXIN;
 270         outb_p(b, dev->iobase + 8);
 271
 272         /* register 9    */
 273         b = IRQ | CONVSRC | BURSTEN | INTE;
 274         outb_p(b, dev->iobase + 9);
 275
 276         /* register 10   */
 277         b = TGSEL | TGEN;
 278         outb_p(b, dev->iobase + 10);
 279
 280         b = 0x07;
 281         outb_p(b, dev->iobase + 8);
 282
 283         das6402_setcounter(dev);
 284
 285         outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
 286
 287         devpriv->das6402_ignoreirq = 0;
 288
 289         return 0;
 290 }
 291
 292 static int das6402_detach(struct comedi_device * dev)
 293 {
 294         if (dev->irq)
 295                 comedi_free_irq(dev->irq, dev);
 296         if (dev->iobase)
 297                 release_region(dev->iobase, DAS6402_SIZE);
 298
 299         return 0;
 300 }
 301
 302 static int das6402_attach(struct comedi_device * dev, struct comedi_devconfig * it)
 303 {
 304         unsigned int irq;
 305         unsigned long iobase;
 306         int ret;
 307         struct comedi_subdevice *s;
 308
 309         dev->board_name = "das6402";
 310
 311         iobase = it->options[0];
 312         if (iobase == 0)
 313                 iobase = 0x300;
 314
 315         printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase);
 316
 317         if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
 318                 printk(" I/O port conflict\n");
 319                 return -EIO;
 320         }
 321         dev->iobase = iobase;
 322
 323         /* should do a probe here */
 324
 325         irq = it->options[0];
 326         printk(" ( irq = %u )", irq);
 327         ret = comedi_request_irq(irq, intr_handler, 0, "das6402", dev);
 328         if (ret < 0) {
 329                 printk("irq conflict\n");
 330                 return ret;
 331         }
 332         dev->irq = irq;
 333
 334         if ((ret = alloc_private(dev, sizeof(struct das6402_private))) < 0)
 335                 return ret;
 336
 337         if ((ret = alloc_subdevices(dev, 1)) < 0)
 338                 return ret;
 339
 340         /* ai subdevice */
 341         s = dev->subdevices + 0;
 342         s->type = COMEDI_SUBD_AI;
 343         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 344         s->n_chan = 8;
 345         //s->trig[2]=das6402_ai_mode2;
 346         s->cancel = das6402_ai_cancel;
 347         s->maxdata = (1 << 12) - 1;
 348         s->len_chanlist = 16;   /* ? */
 349         s->range_table = &range_unknown;
 350
 351         board_init(dev);
 352
 353         return 0;
 354 }