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