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 "../comedidev.h"
  43
  44 #include <linux/ioport.h>
  45 #include <linux/delay.h>
  46
  47 #define DT2814_SIZE 2
  48
  49 #define DT2814_CSR 0
  50 #define DT2814_DATA 1
  51
  52 /*
  53  * flags
  54  */
  55
  56 #define DT2814_FINISH 0x80
  57 #define DT2814_ERR 0x40
  58 #define DT2814_BUSY 0x20
  59 #define DT2814_ENB 0x10
  60 #define DT2814_CHANMASK 0x0f
  61
  62 static int dt2814_attach(struct comedi_device * dev, comedi_devconfig * it);
  63 static int dt2814_detach(struct comedi_device * dev);
  64 static struct comedi_driver driver_dt2814 = {
  65       driver_name:"dt2814",
  66       module:THIS_MODULE,
  67       attach:dt2814_attach,
  68       detach:dt2814_detach,
  69 };
  70
  71 COMEDI_INITCLEANUP(driver_dt2814);
  72
  73 static irqreturn_t dt2814_interrupt(int irq, void *dev PT_REGS_ARG);
  74
  75 typedef struct {
  76         int ntrig;
  77         int curadchan;
  78 } dt2814_private;
  79 #define devpriv ((dt2814_private *)dev->private)
  80
  81 #define DT2814_TIMEOUT 10
  82 #define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
  83
  84 static int dt2814_ai_insn_read(struct comedi_device * dev, struct comedi_subdevice * s,
  85         comedi_insn * insn, unsigned int * data)
  86 {
  87         int n, i, hi, lo;
  88         int chan;
  89         int status = 0;
  90
  91         for (n = 0; n < insn->n; n++) {
  92                 chan = CR_CHAN(insn->chanspec);
  93
  94                 outb(chan, dev->iobase + DT2814_CSR);
  95                 for (i = 0; i < DT2814_TIMEOUT; i++) {
  96                         status = inb(dev->iobase + DT2814_CSR);
  97                         printk("dt2814: status: %02x\n", status);
  98                         comedi_udelay(10);
  99                         if (status & DT2814_FINISH)
 100                                 break;
 101                 }
 102                 if (i >= DT2814_TIMEOUT) {
 103                         printk("dt2814: status: %02x\n", status);
 104                         return -ETIMEDOUT;
 105                 }
 106
 107                 hi = inb(dev->iobase + DT2814_DATA);
 108                 lo = inb(dev->iobase + DT2814_DATA);
 109
 110                 data[n] = (hi << 4) | (lo >> 4);
 111         }
 112
 113         return n;
 114 }
 115
 116 static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
 117 {
 118         int i;
 119         unsigned int f;
 120
 121         /* XXX ignores flags */
 122
 123         f = 10000;              /* ns */
 124         for (i = 0; i < 8; i++) {
 125                 if ((2 * (*ns)) < (f * 11))
 126                         break;
 127                 f *= 10;
 128         }
 129
 130         *ns = f;
 131
 132         return i;
 133 }
 134
 135 static int dt2814_ai_cmdtest(struct comedi_device * dev, struct comedi_subdevice * s,
 136         struct comedi_cmd * cmd)
 137 {
 138         int err = 0;
 139         int tmp;
 140
 141         /* step 1: make sure trigger sources are trivially valid */
 142
 143         tmp = cmd->start_src;
 144         cmd->start_src &= TRIG_NOW;
 145         if (!cmd->start_src || tmp != cmd->start_src)
 146                 err++;
 147
 148         tmp = cmd->scan_begin_src;
 149         cmd->scan_begin_src &= TRIG_TIMER;
 150         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 151                 err++;
 152
 153         tmp = cmd->convert_src;
 154         cmd->convert_src &= TRIG_NOW;
 155         if (!cmd->convert_src || tmp != cmd->convert_src)
 156                 err++;
 157
 158         tmp = cmd->scan_end_src;
 159         cmd->scan_end_src &= TRIG_COUNT;
 160         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 161                 err++;
 162
 163         tmp = cmd->stop_src;
 164         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 165         if (!cmd->stop_src || tmp != cmd->stop_src)
 166                 err++;
 167
 168         if (err)
 169                 return 1;
 170
 171         /* step 2: make sure trigger sources are unique and mutually compatible */
 172
 173         /* note that mutual compatiblity is not an issue here */
 174         if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
 175                 err++;
 176
 177         if (err)
 178                 return 2;
 179
 180         /* step 3: make sure arguments are trivially compatible */
 181
 182         if (cmd->start_arg != 0) {
 183                 cmd->start_arg = 0;
 184                 err++;
 185         }
 186         if (cmd->scan_begin_arg > 1000000000) {
 187                 cmd->scan_begin_arg = 1000000000;
 188                 err++;
 189         }
 190         if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
 191                 cmd->scan_begin_arg = DT2814_MAX_SPEED;
 192                 err++;
 193         }
 194         if (cmd->scan_end_arg != cmd->chanlist_len) {
 195                 cmd->scan_end_arg = cmd->chanlist_len;
 196                 err++;
 197         }
 198         if (cmd->stop_src == TRIG_COUNT) {
 199                 if (cmd->stop_arg < 2) {
 200                         cmd->stop_arg = 2;
 201                         err++;
 202                 }
 203         } else {
 204                 /* TRIG_NONE */
 205                 if (cmd->stop_arg != 0) {
 206                         cmd->stop_arg = 0;
 207                         err++;
 208                 }
 209         }
 210
 211         if (err)
 212                 return 3;
 213
 214         /* step 4: fix up any arguments */
 215
 216         tmp = cmd->scan_begin_arg;
 217         dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
 218         if (tmp != cmd->scan_begin_arg)
 219                 err++;
 220
 221         if (err)
 222                 return 4;
 223
 224         return 0;
 225 }
 226
 227 static int dt2814_ai_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
 228 {
 229         struct comedi_cmd *cmd = &s->async->cmd;
 230         int chan;
 231         int trigvar;
 232
 233         trigvar =
 234                 dt2814_ns_to_timer(&cmd->scan_begin_arg,
 235                 cmd->flags & TRIG_ROUND_MASK);
 236
 237         chan = CR_CHAN(cmd->chanlist[0]);
 238
 239         devpriv->ntrig = cmd->stop_arg;
 240         outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
 241
 242         return 0;
 243
 244 }
 245
 246 static int dt2814_attach(struct comedi_device * dev, comedi_devconfig * it)
 247 {
 248         int i, irq;
 249         int ret;
 250         struct comedi_subdevice *s;
 251         unsigned long iobase;
 252
 253         iobase = it->options[0];
 254         printk("comedi%d: dt2814: 0x%04lx ", dev->minor, iobase);
 255         if (!request_region(iobase, DT2814_SIZE, "dt2814")) {
 256                 printk("I/O port conflict\n");
 257                 return -EIO;
 258         }
 259         dev->iobase = iobase;
 260         dev->board_name = "dt2814";
 261
 262         outb(0, dev->iobase + DT2814_CSR);
 263         comedi_udelay(100);
 264         if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
 265                 printk("reset error (fatal)\n");
 266                 return -EIO;
 267         }
 268         i = inb(dev->iobase + DT2814_DATA);
 269         i = inb(dev->iobase + DT2814_DATA);
 270
 271         irq = it->options[1];
 272 #if 0
 273         if (irq < 0) {
 274                 save_flags(flags);
 275                 sti();
 276                 irqs = probe_irq_on();
 277
 278                 outb(0, dev->iobase + DT2814_CSR);
 279
 280                 comedi_udelay(100);
 281
 282                 irq = probe_irq_off(irqs);
 283                 restore_flags(flags);
 284                 if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
 285                         printk("error probing irq (bad) \n");
 286                 }
 287
 288                 i = inb(dev->iobase + DT2814_DATA);
 289                 i = inb(dev->iobase + DT2814_DATA);
 290         }
 291 #endif
 292         dev->irq = 0;
 293         if (irq > 0) {
 294                 if (comedi_request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
 295                         printk("(irq %d unavailable)\n", irq);
 296                 } else {
 297                         printk("( irq = %d )\n", irq);
 298                         dev->irq = irq;
 299                 }
 300         } else if (irq == 0) {
 301                 printk("(no irq)\n");
 302         } else {
 303 #if 0
 304                 printk("(probe returned multiple irqs--bad)\n");
 305 #else
 306                 printk("(irq probe not implemented)\n");
 307 #endif
 308         }
 309
 310         if ((ret = alloc_subdevices(dev, 1)) < 0)
 311                 return ret;
 312         if ((ret = alloc_private(dev, sizeof(dt2814_private))) < 0)
 313                 return ret;
 314
 315         s = dev->subdevices + 0;
 316         dev->read_subdev = s;
 317         s->type = COMEDI_SUBD_AI;
 318         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
 319         s->n_chan = 16;         /* XXX */
 320         s->len_chanlist = 1;
 321         s->insn_read = dt2814_ai_insn_read;
 322         s->do_cmd = dt2814_ai_cmd;
 323         s->do_cmdtest = dt2814_ai_cmdtest;
 324         s->maxdata = 0xfff;
 325         s->range_table = &range_unknown;        /* XXX */
 326
 327         return 0;
 328 }
 329
 330 static int dt2814_detach(struct comedi_device * dev)
 331 {
 332         printk("comedi%d: dt2814: remove\n", dev->minor);
 333
 334         if (dev->irq) {
 335                 comedi_free_irq(dev->irq, dev);
 336         }
 337         if (dev->iobase) {
 338                 release_region(dev->iobase, DT2814_SIZE);
 339         }
 340
 341         return 0;
 342 }
 343
 344 static irqreturn_t dt2814_interrupt(int irq, void *d PT_REGS_ARG)
 345 {
 346         int lo, hi;
 347         struct comedi_device *dev = d;
 348         struct comedi_subdevice *s;
 349         int data;
 350
 351         if (!dev->attached) {
 352                 comedi_error(dev, "spurious interrupt");
 353                 return IRQ_HANDLED;
 354         }
 355
 356         s = dev->subdevices + 0;
 357
 358         hi = inb(dev->iobase + DT2814_DATA);
 359         lo = inb(dev->iobase + DT2814_DATA);
 360
 361         data = (hi << 4) | (lo >> 4);
 362
 363         if (!(--devpriv->ntrig)) {
 364                 int i;
 365
 366                 outb(0, dev->iobase + DT2814_CSR);
 367                 /* note: turning off timed mode triggers another
 368                    sample. */
 369
 370                 for (i = 0; i < DT2814_TIMEOUT; i++) {
 371                         if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
 372                                 break;
 373                 }
 374                 inb(dev->iobase + DT2814_DATA);
 375                 inb(dev->iobase + DT2814_DATA);
 376
 377                 s->async->events |= COMEDI_CB_EOA;
 378         }
 379         comedi_event(dev, s);
 380         return IRQ_HANDLED;
 381 }