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 /*
  27 Driver: das6402
  28 Description: Keithley Metrabyte DAS6402 (& compatibles)
  29 Author: Oystein Svendsen <svendsen@pvv.org>
  30 Status: bitrotten
  31 Devices: [Keithley Metrabyte] DAS6402 (das6402)
  32
  33 This driver has suffered bitrot.
  34 */
  35
  36 #include <linux/interrupt.h>
  37 #include "../comedidev.h"
  38
  39 #include <linux/ioport.h>
  40
  41 #define DAS6402_SIZE 16
  42
  43 #define N_WORDS (3000*64)
  44
  45 #define STOP    0
  46 #define START   1
  47
  48 #define SCANL 0x3f00
  49 #define BYTE unsigned char
  50 #define WORD unsigned short
  51
  52 /*----- register 8 ----*/
  53 #define CLRINT 0x01
  54 #define CLRXTR 0x02
  55 #define CLRXIN 0x04
  56 #define EXTEND 0x10
  57 #define ARMED 0x20              /* enable conting of post sample conv */
  58 #define POSTMODE 0x40
  59 #define MHZ 0x80                /* 10 MHz clock */
  60 /*---------------------*/
  61
  62 /*----- register 9 ----*/
  63 #define IRQ (0x04 << 4)         /* these two are                         */
  64 #define IRQV 10                 /*               dependent on each other */
  65
  66 #define CONVSRC 0x03            /* trig src is Intarnal pacer */
  67 #define BURSTEN 0x04            /* enable burst */
  68 #define XINTE 0x08              /* use external int. trig */
  69 #define INTE 0x80               /* enable analog interrupts */
  70 /*---------------------*/
  71
  72 /*----- register 10 ---*/
  73 #define TGEN 0x01               /* Use pin DI1 for externl trigging? */
  74 #define TGSEL 0x02              /* Use edge triggering */
  75 #define TGPOL 0x04              /* active edge is falling */
  76 #define PRETRIG 0x08            /* pretrig */
  77 /*---------------------*/
  78
  79 /*----- register 11 ---*/
  80 #define EOB 0x0c
  81 #define FIFOHFULL 0x08
  82 #define GAIN 0x01
  83 #define FIFONEPTY 0x04
  84 #define MODE 0x10
  85 #define SEM 0x20
  86 #define BIP 0x40
  87 /*---------------------*/
  88
  89 #define M0 0x00
  90 #define M2 0x04
  91
  92 #define C0 0x00
  93 #define C1 0x40
  94 #define C2 0x80
  95 #define RWLH 0x30
  96
  97 struct das6402_private {
  98         int ai_bytes_to_read;
  99
 100         int das6402_ignoreirq;
 101 };
 102
 103 static void das6402_ai_fifo_dregs(struct comedi_device *dev,
 104                                   struct comedi_subdevice *s)
 105 {
 106         while (1) {
 107                 if (!(inb(dev->iobase + 8) & 0x01))
 108                         return;
 109                 comedi_buf_put(s->async, inw(dev->iobase));
 110         }
 111 }
 112
 113 static void das6402_setcounter(struct comedi_device *dev)
 114 {
 115         BYTE p;
 116         unsigned short ctrlwrd;
 117
 118         /* set up counter0 first, mode 0 */
 119         p = M0 | C0 | RWLH;
 120         outb_p(p, dev->iobase + 15);
 121         ctrlwrd = 2000;
 122         p = (BYTE) (0xff & ctrlwrd);
 123         outb_p(p, dev->iobase + 12);
 124         p = (BYTE) (0xff & (ctrlwrd >> 8));
 125         outb_p(p, dev->iobase + 12);
 126
 127         /* set up counter1, mode 2 */
 128         p = M2 | C1 | RWLH;
 129         outb_p(p, dev->iobase + 15);
 130         ctrlwrd = 10;
 131         p = (BYTE) (0xff & ctrlwrd);
 132         outb_p(p, dev->iobase + 13);
 133         p = (BYTE) (0xff & (ctrlwrd >> 8));
 134         outb_p(p, dev->iobase + 13);
 135
 136         /* set up counter1, mode 2 */
 137         p = M2 | C2 | RWLH;
 138         outb_p(p, dev->iobase + 15);
 139         ctrlwrd = 1000;
 140         p = (BYTE) (0xff & ctrlwrd);
 141         outb_p(p, dev->iobase + 14);
 142         p = (BYTE) (0xff & (ctrlwrd >> 8));
 143         outb_p(p, dev->iobase + 14);
 144 }
 145
 146 static irqreturn_t intr_handler(int irq, void *d)
 147 {
 148         struct comedi_device *dev = d;
 149         struct das6402_private *devpriv = dev->private;
 150         struct comedi_subdevice *s = &dev->subdevices[0];
 151
 152         if (!dev->attached || devpriv->das6402_ignoreirq) {
 153                 dev_warn(dev->class_dev, "BUG: spurious interrupt\n");
 154                 return IRQ_HANDLED;
 155         }
 156 #ifdef DEBUG
 157         printk("das6402: interrupt! das6402_irqcount=%i\n",
 158                devpriv->das6402_irqcount);
 159         printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
 160 #endif
 161
 162         das6402_ai_fifo_dregs(dev, s);
 163
 164         if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
 165                 outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
 166                 outb(0x07, dev->iobase + 8);    /* clears all flip-flops */
 167 #ifdef DEBUG
 168                 printk("das6402: Got %i samples\n\n",
 169                        devpriv->das6402_wordsread - diff);
 170 #endif
 171                 s->async->events |= COMEDI_CB_EOA;
 172                 comedi_event(dev, s);
 173         }
 174
 175         outb(0x01, dev->iobase + 8);    /* clear only the interrupt flip-flop */
 176
 177         comedi_event(dev, s);
 178         return IRQ_HANDLED;
 179 }
 180
 181 #if 0
 182 static void das6402_ai_fifo_read(struct comedi_device *dev, short *data, int n)
 183 {
 184         int i;
 185
 186         for (i = 0; i < n; i++)
 187                 data[i] = inw(dev->iobase);
 188 }
 189 #endif
 190
 191 static int das6402_ai_cancel(struct comedi_device *dev,
 192                              struct comedi_subdevice *s)
 193 {
 194         struct das6402_private *devpriv = dev->private;
 195
 196         /*
 197          *  This function should reset the board from whatever condition it
 198          *  is in (i.e., acquiring data), to a non-active state.
 199          */
 200
 201         devpriv->das6402_ignoreirq = 1;
 202         dev_dbg(dev->class_dev, "Stopping acquisition\n");
 203         devpriv->das6402_ignoreirq = 1;
 204         outb_p(0x02, dev->iobase + 10); /* disable external trigging */
 205         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 206         outb_p(0, dev->iobase + 9);     /* disables interrupts */
 207
 208         outw_p(SCANL, dev->iobase + 2);
 209
 210         return 0;
 211 }
 212
 213 #ifdef unused
 214 static int das6402_ai_mode2(struct comedi_device *dev,
 215                             struct comedi_subdevice *s, comedi_trig * it)
 216 {
 217         struct das6402_private *devpriv = dev->private;
 218
 219         devpriv->das6402_ignoreirq = 1;
 220         dev_dbg(dev->class_dev, "Starting acquisition\n");
 221         outb_p(0x03, dev->iobase + 10); /* enable external trigging */
 222         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 223         outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
 224
 225         devpriv->ai_bytes_to_read = it->n * sizeof(short);
 226
 227         /* um... ignoreirq is a nasty race condition */
 228         devpriv->das6402_ignoreirq = 0;
 229
 230         outw_p(SCANL, dev->iobase + 2);
 231
 232         return 0;
 233 }
 234 #endif
 235
 236 static int board_init(struct comedi_device *dev)
 237 {
 238         struct das6402_private *devpriv = dev->private;
 239         BYTE b;
 240
 241         devpriv->das6402_ignoreirq = 1;
 242
 243         outb(0x07, dev->iobase + 8);
 244
 245         /* register 11  */
 246         outb_p(MODE, dev->iobase + 11);
 247         b = BIP | SEM | MODE | GAIN | FIFOHFULL;
 248         outb_p(b, dev->iobase + 11);
 249
 250         /* register 8   */
 251         outb_p(EXTEND, dev->iobase + 8);
 252         b = EXTEND | MHZ;
 253         outb_p(b, dev->iobase + 8);
 254         b = MHZ | CLRINT | CLRXTR | CLRXIN;
 255         outb_p(b, dev->iobase + 8);
 256
 257         /* register 9    */
 258         b = IRQ | CONVSRC | BURSTEN | INTE;
 259         outb_p(b, dev->iobase + 9);
 260
 261         /* register 10   */
 262         b = TGSEL | TGEN;
 263         outb_p(b, dev->iobase + 10);
 264
 265         b = 0x07;
 266         outb_p(b, dev->iobase + 8);
 267
 268         das6402_setcounter(dev);
 269
 270         outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
 271
 272         devpriv->das6402_ignoreirq = 0;
 273
 274         return 0;
 275 }
 276
 277 static int das6402_attach(struct comedi_device *dev,
 278                           struct comedi_devconfig *it)
 279 {
 280         struct das6402_private *devpriv;
 281         unsigned int irq;
 282         int ret;
 283         struct comedi_subdevice *s;
 284
 285         ret = comedi_request_region(dev, it->options[0], DAS6402_SIZE);
 286         if (ret)
 287                 return ret;
 288
 289         irq = it->options[0];
 290         dev_dbg(dev->class_dev, "( irq = %u )\n", irq);
 291         ret = request_irq(irq, intr_handler, 0, "das6402", dev);
 292         if (ret < 0)
 293                 return ret;
 294
 295         dev->irq = irq;
 296
 297         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 298         if (!devpriv)
 299                 return -ENOMEM;
 300         dev->private = devpriv;
 301
 302         ret = comedi_alloc_subdevices(dev, 1);
 303         if (ret)
 304                 return ret;
 305
 306         /* ai subdevice */
 307         s = &dev->subdevices[0];
 308         s->type = COMEDI_SUBD_AI;
 309         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 310         s->n_chan = 8;
 311         /* s->trig[2]=das6402_ai_mode2; */
 312         s->cancel = das6402_ai_cancel;
 313         s->maxdata = (1 << 12) - 1;
 314         s->len_chanlist = 16;   /* ? */
 315         s->range_table = &range_unknown;
 316
 317         board_init(dev);
 318
 319         return 0;
 320 }
 321
 322 static struct comedi_driver das6402_driver = {
 323         .driver_name    = "das6402",
 324         .module         = THIS_MODULE,
 325         .attach         = das6402_attach,
 326         .detach         = comedi_legacy_detach,
 327 };
 328 module_comedi_driver(das6402_driver)
 329
 330 MODULE_AUTHOR("Comedi http://www.comedi.org");
 331 MODULE_DESCRIPTION("Comedi low-level driver");
 332 MODULE_LICENSE("GPL");