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