drivers/staging/comedi/drivers/dt2814.c

   1 /*
   2     comedi/drivers/dt2814.c
   3     Hardware driver for Data Translation DT2814
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1998 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: dt2814
  25 Description: Data Translation DT2814
  26 Author: ds
  27 Status: complete
  28 Devices: [Data Translation] DT2814 (dt2814)
  29
  30 Configuration options:
  31   [0] - I/O port base address
  32   [1] - IRQ
  33
  34 This card has 16 analog inputs multiplexed onto a 12 bit ADC.  There
  35 is a minimally useful onboard clock.  The base frequency for the
  36 clock is selected by jumpers, and the clock divider can be selected
  37 via programmed I/O.  Unfortunately, the clock divider can only be
  38 a power of 10, from 1 to 10^7, of which only 3 or 4 are useful.  In
  39 addition, the clock does not seem to be very accurate.
  40 */
  41
  42 #include <linux/interrupt.h>
  43 #include "../comedidev.h"
  44
  45 #include <linux/ioport.h>
  46 #include <linux/delay.h>
  47
  48 #define DT2814_SIZE 2
  49
  50 #define DT2814_CSR 0
  51 #define DT2814_DATA 1
  52
  53 /*
  54  * flags
  55  */
  56
  57 #define DT2814_FINISH 0x80
  58 #define DT2814_ERR 0x40
  59 #define DT2814_BUSY 0x20
  60 #define DT2814_ENB 0x10
  61 #define DT2814_CHANMASK 0x0f
  62
  63 struct dt2814_private {
  64
  65         int ntrig;
  66         int curadchan;
  67 };
  68
  69 #define devpriv ((struct dt2814_private *)dev->private)
  70
  71 #define DT2814_TIMEOUT 10
  72 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
  73
  74 static int dt2814_ai_insn_read(struct comedi_device *dev,
  75                                struct comedi_subdevice *s,
  76                                struct comedi_insn *insn, unsigned int *data)
  77 {
  78         int n, i, hi, lo;
  79         int chan;
  80         int status = 0;
  81
  82         for (n = 0; n < insn->n; n++) {
  83                 chan = CR_CHAN(insn->chanspec);
  84
  85                 outb(chan, dev->iobase + DT2814_CSR);
  86                 for (i = 0; i < DT2814_TIMEOUT; i++) {
  87                         status = inb(dev->iobase + DT2814_CSR);
  88                         printk(KERN_INFO "dt2814: status: %02x\n", status);
  89                         udelay(10);
  90                         if (status & DT2814_FINISH)
  91                                 break;
  92                 }
  93                 if (i >= DT2814_TIMEOUT) {
  94                         printk(KERN_INFO "dt2814: status: %02x\n", status);
  95                         return -ETIMEDOUT;
  96                 }
  97
  98                 hi = inb(dev->iobase + DT2814_DATA);
  99                 lo = inb(dev->iobase + DT2814_DATA);
 100
 101                 data[n] = (hi << 4) | (lo >> 4);
 102         }
 103
 104         return n;
 105 }
 106
 107 static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
 108 {
 109         int i;
 110         unsigned int f;
 111
 112         /* XXX ignores flags */
 113
 114         f = 10000;              /* ns */
 115         for (i = 0; i < 8; i++) {
 116                 if ((2 * (*ns)) < (f * 11))
 117                         break;
 118                 f *= 10;
 119         }
 120
 121         *ns = f;
 122
 123         return i;
 124 }
 125
 126 static int dt2814_ai_cmdtest(struct comedi_device *dev,
 127                              struct comedi_subdevice *s, struct comedi_cmd *cmd)
 128 {
 129         int err = 0;
 130         int tmp;
 131
 132         /* step 1: make sure trigger sources are trivially valid */
 133
 134         tmp = cmd->start_src;
 135         cmd->start_src &= TRIG_NOW;
 136         if (!cmd->start_src || tmp != cmd->start_src)
 137                 err++;
 138
 139         tmp = cmd->scan_begin_src;
 140         cmd->scan_begin_src &= TRIG_TIMER;
 141         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 142                 err++;
 143
 144         tmp = cmd->convert_src;
 145         cmd->convert_src &= TRIG_NOW;
 146         if (!cmd->convert_src || tmp != cmd->convert_src)
 147                 err++;
 148
 149         tmp = cmd->scan_end_src;
 150         cmd->scan_end_src &= TRIG_COUNT;
 151         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 152                 err++;
 153
 154         tmp = cmd->stop_src;
 155         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 156         if (!cmd->stop_src || tmp != cmd->stop_src)
 157                 err++;
 158
 159         if (err)
 160                 return 1;
 161
 162         /* step 2: make sure trigger sources are
 163          * unique and mutually compatible */
 164
 165         /* note that mutual compatibility is not an issue here */
 166         if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
 167                 err++;
 168
 169         if (err)
 170                 return 2;
 171
 172         /* step 3: make sure arguments are trivially compatible */
 173
 174         if (cmd->start_arg != 0) {
 175                 cmd->start_arg = 0;
 176                 err++;
 177         }
 178         if (cmd->scan_begin_arg > 1000000000) {
 179                 cmd->scan_begin_arg = 1000000000;
 180                 err++;
 181         }
 182         if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
 183                 cmd->scan_begin_arg = DT2814_MAX_SPEED;
 184                 err++;
 185         }
 186         if (cmd->scan_end_arg != cmd->chanlist_len) {
 187                 cmd->scan_end_arg = cmd->chanlist_len;
 188                 err++;
 189         }
 190         if (cmd->stop_src == TRIG_COUNT) {
 191                 if (cmd->stop_arg < 2) {
 192                         cmd->stop_arg = 2;
 193                         err++;
 194                 }
 195         } else {
 196                 /* TRIG_NONE */
 197                 if (cmd->stop_arg != 0) {
 198                         cmd->stop_arg = 0;
 199                         err++;
 200                 }
 201         }
 202
 203         if (err)
 204                 return 3;
 205
 206         /* step 4: fix up any arguments */
 207
 208         tmp = cmd->scan_begin_arg;
 209         dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
 210         if (tmp != cmd->scan_begin_arg)
 211                 err++;
 212
 213         if (err)
 214                 return 4;
 215
 216         return 0;
 217 }
 218
 219 static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 220 {
 221         struct comedi_cmd *cmd = &s->async->cmd;
 222         int chan;
 223         int trigvar;
 224
 225         trigvar =
 226             dt2814_ns_to_timer(&cmd->scan_begin_arg,
 227                                cmd->flags & TRIG_ROUND_MASK);
 228
 229         chan = CR_CHAN(cmd->chanlist[0]);
 230
 231         devpriv->ntrig = cmd->stop_arg;
 232         outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
 233
 234         return 0;
 235
 236 }
 237
 238 static irqreturn_t dt2814_interrupt(int irq, void *d)
 239 {
 240         int lo, hi;
 241         struct comedi_device *dev = d;
 242         struct comedi_subdevice *s;
 243         int data;
 244
 245         if (!dev->attached) {
 246                 comedi_error(dev, "spurious interrupt");
 247                 return IRQ_HANDLED;
 248         }
 249
 250         s = dev->subdevices + 0;
 251
 252         hi = inb(dev->iobase + DT2814_DATA);
 253         lo = inb(dev->iobase + DT2814_DATA);
 254
 255         data = (hi << 4) | (lo >> 4);
 256
 257         if (!(--devpriv->ntrig)) {
 258                 int i;
 259
 260                 outb(0, dev->iobase + DT2814_CSR);
 261                 /* note: turning off timed mode triggers another
 262                    sample. */
 263
 264                 for (i = 0; i < DT2814_TIMEOUT; i++) {
 265                         if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
 266                                 break;
 267                 }
 268                 inb(dev->iobase + DT2814_DATA);
 269                 inb(dev->iobase + DT2814_DATA);
 270
 271                 s->async->events |= COMEDI_CB_EOA;
 272         }
 273         comedi_event(dev, s);
 274         return IRQ_HANDLED;
 275 }
 276
 277 static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 278 {
 279         int i, irq;
 280         int ret;
 281         struct comedi_subdevice *s;
 282         unsigned long iobase;
 283
 284         iobase = it->options[0];
 285         printk(KERN_INFO "comedi%d: dt2814: 0x%04lx ", dev->minor, iobase);
 286         if (!request_region(iobase, DT2814_SIZE, "dt2814")) {
 287                 printk(KERN_ERR "I/O port conflict\n");
 288                 return -EIO;
 289         }
 290         dev->iobase = iobase;
 291         dev->board_name = "dt2814";
 292
 293         outb(0, dev->iobase + DT2814_CSR);
 294         udelay(100);
 295         if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
 296                 printk(KERN_ERR "reset error (fatal)\n");
 297                 return -EIO;
 298         }
 299         i = inb(dev->iobase + DT2814_DATA);
 300         i = inb(dev->iobase + DT2814_DATA);
 301
 302         irq = it->options[1];
 303 #if 0
 304         if (irq < 0) {
 305                 save_flags(flags);
 306                 sti();
 307                 irqs = probe_irq_on();
 308
 309                 outb(0, dev->iobase + DT2814_CSR);
 310
 311                 udelay(100);
 312
 313                 irq = probe_irq_off(irqs);
 314                 restore_flags(flags);
 315                 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR)
 316                         printk(KERN_DEBUG "error probing irq (bad)\n");
 317
 318
 319                 i = inb(dev->iobase + DT2814_DATA);
 320                 i = inb(dev->iobase + DT2814_DATA);
 321         }
 322 #endif
 323         dev->irq = 0;
 324         if (irq > 0) {
 325                 if (request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
 326                         printk(KERN_WARNING "(irq %d unavailable)\n", irq);
 327                 } else {
 328                         printk(KERN_INFO "( irq = %d )\n", irq);
 329                         dev->irq = irq;
 330                 }
 331         } else if (irq == 0) {
 332                 printk(KERN_WARNING "(no irq)\n");
 333         } else {
 334 #if 0
 335                 printk(KERN_DEBUG "(probe returned multiple irqs--bad)\n");
 336 #else
 337                 printk(KERN_WARNING "(irq probe not implemented)\n");
 338 #endif
 339         }
 340
 341         ret = comedi_alloc_subdevices(dev, 1);
 342         if (ret)
 343                 return ret;
 344
 345         ret = alloc_private(dev, sizeof(struct dt2814_private));
 346         if (ret < 0)
 347                 return ret;
 348
 349         s = dev->subdevices + 0;
 350         dev->read_subdev = s;
 351         s->type = COMEDI_SUBD_AI;
 352         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
 353         s->n_chan = 16;         /* XXX */
 354         s->len_chanlist = 1;
 355         s->insn_read = dt2814_ai_insn_read;
 356         s->do_cmd = dt2814_ai_cmd;
 357         s->do_cmdtest = dt2814_ai_cmdtest;
 358         s->maxdata = 0xfff;
 359         s->range_table = &range_unknown;        /* XXX */
 360
 361         return 0;
 362 }
 363
 364 static void dt2814_detach(struct comedi_device *dev)
 365 {
 366         if (dev->irq)
 367                 free_irq(dev->irq, dev);
 368         if (dev->iobase)
 369                 release_region(dev->iobase, DT2814_SIZE);
 370 }
 371
 372 static struct comedi_driver dt2814_driver = {
 373         .driver_name    = "dt2814",
 374         .module         = THIS_MODULE,
 375         .attach         = dt2814_attach,
 376         .detach         = dt2814_detach,
 377 };
 378 module_comedi_driver(dt2814_driver);
 379
 380 MODULE_AUTHOR("Comedi http://www.comedi.org");
 381 MODULE_DESCRIPTION("Comedi low-level driver");
 382 MODULE_LICENSE("GPL");