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 static int dt2814_attach(struct comedi_device *dev,
  64                          struct comedi_devconfig *it);
  65 static int dt2814_detach(struct comedi_device *dev);
  66 static struct comedi_driver driver_dt2814 = {
  67         .driver_name = "dt2814",
  68         .module = THIS_MODULE,
  69         .attach = dt2814_attach,
  70         .detach = dt2814_detach,
  71 };
  72
  73 static int __init driver_dt2814_init_module(void)
  74 {
  75         return comedi_driver_register(&driver_dt2814);
  76 }
  77
  78 static void __exit driver_dt2814_cleanup_module(void)
  79 {
  80         comedi_driver_unregister(&driver_dt2814);
  81 }
  82
  83 module_init(driver_dt2814_init_module);
  84 module_exit(driver_dt2814_cleanup_module);
  85
  86 static irqreturn_t dt2814_interrupt(int irq, void *dev);
  87
  88 struct dt2814_private {
  89
  90         int ntrig;
  91         int curadchan;
  92 };
  93
  94 #define devpriv ((struct dt2814_private *)dev->private)
  95
  96 #define DT2814_TIMEOUT 10
  97 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
  98
  99 static int dt2814_ai_insn_read(struct comedi_device *dev,
 100                                struct comedi_subdevice *s,
 101                                struct comedi_insn *insn, unsigned int *data)
 102 {
 103         int n, i, hi, lo;
 104         int chan;
 105         int status = 0;
 106
 107         for (n = 0; n < insn->n; n++) {
 108                 chan = CR_CHAN(insn->chanspec);
 109
 110                 outb(chan, dev->iobase + DT2814_CSR);
 111                 for (i = 0; i < DT2814_TIMEOUT; i++) {
 112                         status = inb(dev->iobase + DT2814_CSR);
 113                         printk(KERN_INFO "dt2814: status: %02x\n", status);
 114                         udelay(10);
 115                         if (status & DT2814_FINISH)
 116                                 break;
 117                 }
 118                 if (i >= DT2814_TIMEOUT) {
 119                         printk(KERN_INFO "dt2814: status: %02x\n", status);
 120                         return -ETIMEDOUT;
 121                 }
 122
 123                 hi = inb(dev->iobase + DT2814_DATA);
 124                 lo = inb(dev->iobase + DT2814_DATA);
 125
 126                 data[n] = (hi << 4) | (lo >> 4);
 127         }
 128
 129         return n;
 130 }
 131
 132 static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
 133 {
 134         int i;
 135         unsigned int f;
 136
 137         /* XXX ignores flags */
 138
 139         f = 10000;              /* ns */
 140         for (i = 0; i < 8; i++) {
 141                 if ((2 * (*ns)) < (f * 11))
 142                         break;
 143                 f *= 10;
 144         }
 145
 146         *ns = f;
 147
 148         return i;
 149 }
 150
 151 static int dt2814_ai_cmdtest(struct comedi_device *dev,
 152                              struct comedi_subdevice *s, struct comedi_cmd *cmd)
 153 {
 154         int err = 0;
 155         int tmp;
 156
 157         /* step 1: make sure trigger sources are trivially valid */
 158
 159         tmp = cmd->start_src;
 160         cmd->start_src &= TRIG_NOW;
 161         if (!cmd->start_src || tmp != cmd->start_src)
 162                 err++;
 163
 164         tmp = cmd->scan_begin_src;
 165         cmd->scan_begin_src &= TRIG_TIMER;
 166         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 167                 err++;
 168
 169         tmp = cmd->convert_src;
 170         cmd->convert_src &= TRIG_NOW;
 171         if (!cmd->convert_src || tmp != cmd->convert_src)
 172                 err++;
 173
 174         tmp = cmd->scan_end_src;
 175         cmd->scan_end_src &= TRIG_COUNT;
 176         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 177                 err++;
 178
 179         tmp = cmd->stop_src;
 180         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 181         if (!cmd->stop_src || tmp != cmd->stop_src)
 182                 err++;
 183
 184         if (err)
 185                 return 1;
 186
 187         /* step 2: make sure trigger sources are
 188          * unique and mutually compatible */
 189
 190         /* note that mutual compatibility is not an issue here */
 191         if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
 192                 err++;
 193
 194         if (err)
 195                 return 2;
 196
 197         /* step 3: make sure arguments are trivially compatible */
 198
 199         if (cmd->start_arg != 0) {
 200                 cmd->start_arg = 0;
 201                 err++;
 202         }
 203         if (cmd->scan_begin_arg > 1000000000) {
 204                 cmd->scan_begin_arg = 1000000000;
 205                 err++;
 206         }
 207         if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
 208                 cmd->scan_begin_arg = DT2814_MAX_SPEED;
 209                 err++;
 210         }
 211         if (cmd->scan_end_arg != cmd->chanlist_len) {
 212                 cmd->scan_end_arg = cmd->chanlist_len;
 213                 err++;
 214         }
 215         if (cmd->stop_src == TRIG_COUNT) {
 216                 if (cmd->stop_arg < 2) {
 217                         cmd->stop_arg = 2;
 218                         err++;
 219                 }
 220         } else {
 221                 /* TRIG_NONE */
 222                 if (cmd->stop_arg != 0) {
 223                         cmd->stop_arg = 0;
 224                         err++;
 225                 }
 226         }
 227
 228         if (err)
 229                 return 3;
 230
 231         /* step 4: fix up any arguments */
 232
 233         tmp = cmd->scan_begin_arg;
 234         dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
 235         if (tmp != cmd->scan_begin_arg)
 236                 err++;
 237
 238         if (err)
 239                 return 4;
 240
 241         return 0;
 242 }
 243
 244 static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 245 {
 246         struct comedi_cmd *cmd = &s->async->cmd;
 247         int chan;
 248         int trigvar;
 249
 250         trigvar =
 251             dt2814_ns_to_timer(&cmd->scan_begin_arg,
 252                                cmd->flags & TRIG_ROUND_MASK);
 253
 254         chan = CR_CHAN(cmd->chanlist[0]);
 255
 256         devpriv->ntrig = cmd->stop_arg;
 257         outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
 258
 259         return 0;
 260
 261 }
 262
 263 static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 264 {
 265         int i, irq;
 266         int ret;
 267         struct comedi_subdevice *s;
 268         unsigned long iobase;
 269
 270         iobase = it->options[0];
 271         printk(KERN_INFO "comedi%d: dt2814: 0x%04lx ", dev->minor, iobase);
 272         if (!request_region(iobase, DT2814_SIZE, "dt2814")) {
 273                 printk(KERN_ERR "I/O port conflict\n");
 274                 return -EIO;
 275         }
 276         dev->iobase = iobase;
 277         dev->board_name = "dt2814";
 278
 279         outb(0, dev->iobase + DT2814_CSR);
 280         udelay(100);
 281         if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
 282                 printk(KERN_ERR "reset error (fatal)\n");
 283                 return -EIO;
 284         }
 285         i = inb(dev->iobase + DT2814_DATA);
 286         i = inb(dev->iobase + DT2814_DATA);
 287
 288         irq = it->options[1];
 289 #if 0
 290         if (irq < 0) {
 291                 save_flags(flags);
 292                 sti();
 293                 irqs = probe_irq_on();
 294
 295                 outb(0, dev->iobase + DT2814_CSR);
 296
 297                 udelay(100);
 298
 299                 irq = probe_irq_off(irqs);
 300                 restore_flags(flags);
 301                 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR)
 302                         printk(KERN_DEBUG "error probing irq (bad)\n");
 303
 304
 305                 i = inb(dev->iobase + DT2814_DATA);
 306                 i = inb(dev->iobase + DT2814_DATA);
 307         }
 308 #endif
 309         dev->irq = 0;
 310         if (irq > 0) {
 311                 if (request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
 312                         printk(KERN_WARNING "(irq %d unavailable)\n", irq);
 313                 } else {
 314                         printk(KERN_INFO "( irq = %d )\n", irq);
 315                         dev->irq = irq;
 316                 }
 317         } else if (irq == 0) {
 318                 printk(KERN_WARNING "(no irq)\n");
 319         } else {
 320 #if 0
 321                 printk(KERN_DEBUG "(probe returned multiple irqs--bad)\n");
 322 #else
 323                 printk(KERN_WARNING "(irq probe not implemented)\n");
 324 #endif
 325         }
 326
 327         ret = alloc_subdevices(dev, 1);
 328         if (ret < 0)
 329                 return ret;
 330
 331         ret = alloc_private(dev, sizeof(struct dt2814_private));
 332         if (ret < 0)
 333                 return ret;
 334
 335         s = dev->subdevices + 0;
 336         dev->read_subdev = s;
 337         s->type = COMEDI_SUBD_AI;
 338         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
 339         s->n_chan = 16;         /* XXX */
 340         s->len_chanlist = 1;
 341         s->insn_read = dt2814_ai_insn_read;
 342         s->do_cmd = dt2814_ai_cmd;
 343         s->do_cmdtest = dt2814_ai_cmdtest;
 344         s->maxdata = 0xfff;
 345         s->range_table = &range_unknown;        /* XXX */
 346
 347         return 0;
 348 }
 349
 350 static int dt2814_detach(struct comedi_device *dev)
 351 {
 352         printk(KERN_INFO "comedi%d: dt2814: remove\n", dev->minor);
 353
 354         if (dev->irq)
 355                 free_irq(dev->irq, dev);
 356
 357         if (dev->iobase)
 358                 release_region(dev->iobase, DT2814_SIZE);
 359
 360         return 0;
 361 }
 362
 363 static irqreturn_t dt2814_interrupt(int irq, void *d)
 364 {
 365         int lo, hi;
 366         struct comedi_device *dev = d;
 367         struct comedi_subdevice *s;
 368         int data;
 369
 370         if (!dev->attached) {
 371                 comedi_error(dev, "spurious interrupt");
 372                 return IRQ_HANDLED;
 373         }
 374
 375         s = dev->subdevices + 0;
 376
 377         hi = inb(dev->iobase + DT2814_DATA);
 378         lo = inb(dev->iobase + DT2814_DATA);
 379
 380         data = (hi << 4) | (lo >> 4);
 381
 382         if (!(--devpriv->ntrig)) {
 383                 int i;
 384
 385                 outb(0, dev->iobase + DT2814_CSR);
 386                 /* note: turning off timed mode triggers another
 387                    sample. */
 388
 389                 for (i = 0; i < DT2814_TIMEOUT; i++) {
 390                         if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
 391                                 break;
 392                 }
 393                 inb(dev->iobase + DT2814_DATA);
 394                 inb(dev->iobase + DT2814_DATA);
 395
 396                 s->async->events |= COMEDI_CB_EOA;
 397         }
 398         comedi_event(dev, s);
 399         return IRQ_HANDLED;
 400 }
 401
 402 MODULE_AUTHOR("Comedi http://www.comedi.org");
 403 MODULE_DESCRIPTION("Comedi low-level driver");
 404 MODULE_LICENSE("GPL");