release/src-rt-6.x.4708/linux/linux-2.6.36/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
 138         f = 10000;              /* ns */
 139         for (i = 0; i < 8; i++) {
 140                 if ((2 * (*ns)) < (f * 11))
 141                         break;
 142                 f *= 10;
 143         }
 144
 145         *ns = f;
 146
 147         return i;
 148 }
 149
 150 static int dt2814_ai_cmdtest(struct comedi_device *dev,
 151                              struct comedi_subdevice *s, struct comedi_cmd *cmd)
 152 {
 153         int err = 0;
 154         int tmp;
 155
 156         /* step 1: make sure trigger sources are trivially valid */
 157
 158         tmp = cmd->start_src;
 159         cmd->start_src &= TRIG_NOW;
 160         if (!cmd->start_src || tmp != cmd->start_src)
 161                 err++;
 162
 163         tmp = cmd->scan_begin_src;
 164         cmd->scan_begin_src &= TRIG_TIMER;
 165         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
 166                 err++;
 167
 168         tmp = cmd->convert_src;
 169         cmd->convert_src &= TRIG_NOW;
 170         if (!cmd->convert_src || tmp != cmd->convert_src)
 171                 err++;
 172
 173         tmp = cmd->scan_end_src;
 174         cmd->scan_end_src &= TRIG_COUNT;
 175         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
 176                 err++;
 177
 178         tmp = cmd->stop_src;
 179         cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
 180         if (!cmd->stop_src || tmp != cmd->stop_src)
 181                 err++;
 182
 183         if (err)
 184                 return 1;
 185
 186         /* step 2: make sure trigger sources are
 187          * unique and mutually compatible */
 188
 189         /* note that mutual compatibility is not an issue here */
 190         if (cmd->stop_src != TRIG_TIMER && cmd->stop_src != TRIG_EXT)
 191                 err++;
 192
 193         if (err)
 194                 return 2;
 195
 196         /* step 3: make sure arguments are trivially compatible */
 197
 198         if (cmd->start_arg != 0) {
 199                 cmd->start_arg = 0;
 200                 err++;
 201         }
 202         if (cmd->scan_begin_arg > 1000000000) {
 203                 cmd->scan_begin_arg = 1000000000;
 204                 err++;
 205         }
 206         if (cmd->scan_begin_arg < DT2814_MAX_SPEED) {
 207                 cmd->scan_begin_arg = DT2814_MAX_SPEED;
 208                 err++;
 209         }
 210         if (cmd->scan_end_arg != cmd->chanlist_len) {
 211                 cmd->scan_end_arg = cmd->chanlist_len;
 212                 err++;
 213         }
 214         if (cmd->stop_src == TRIG_COUNT) {
 215                 if (cmd->stop_arg < 2) {
 216                         cmd->stop_arg = 2;
 217                         err++;
 218                 }
 219         } else {
 220                 /* TRIG_NONE */
 221                 if (cmd->stop_arg != 0) {
 222                         cmd->stop_arg = 0;
 223                         err++;
 224                 }
 225         }
 226
 227         if (err)
 228                 return 3;
 229
 230         /* step 4: fix up any arguments */
 231
 232         tmp = cmd->scan_begin_arg;
 233         dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
 234         if (tmp != cmd->scan_begin_arg)
 235                 err++;
 236
 237         if (err)
 238                 return 4;
 239
 240         return 0;
 241 }
 242
 243 static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 244 {
 245         struct comedi_cmd *cmd = &s->async->cmd;
 246         int chan;
 247         int trigvar;
 248
 249         trigvar =
 250             dt2814_ns_to_timer(&cmd->scan_begin_arg,
 251                                cmd->flags & TRIG_ROUND_MASK);
 252
 253         chan = CR_CHAN(cmd->chanlist[0]);
 254
 255         devpriv->ntrig = cmd->stop_arg;
 256         outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
 257
 258         return 0;
 259
 260 }
 261
 262 static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 263 {
 264         int i, irq;
 265         int ret;
 266         struct comedi_subdevice *s;
 267         unsigned long iobase;
 268
 269         iobase = it->options[0];
 270         printk(KERN_INFO "comedi%d: dt2814: 0x%04lx ", dev->minor, iobase);
 271         if (!request_region(iobase, DT2814_SIZE, "dt2814")) {
 272                 printk(KERN_ERR "I/O port conflict\n");
 273                 return -EIO;
 274         }
 275         dev->iobase = iobase;
 276         dev->board_name = "dt2814";
 277
 278         outb(0, dev->iobase + DT2814_CSR);
 279         udelay(100);
 280         if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
 281                 printk(KERN_ERR "reset error (fatal)\n");
 282                 return -EIO;
 283         }
 284         i = inb(dev->iobase + DT2814_DATA);
 285         i = inb(dev->iobase + DT2814_DATA);
 286
 287         irq = it->options[1];
 288         dev->irq = 0;
 289         if (irq > 0) {
 290                 if (request_irq(irq, dt2814_interrupt, 0, "dt2814", dev)) {
 291                         printk(KERN_WARNING "(irq %d unavailable)\n", irq);
 292                 } else {
 293                         printk(KERN_INFO "( irq = %d )\n", irq);
 294                         dev->irq = irq;
 295                 }
 296         } else if (irq == 0) {
 297                 printk(KERN_WARNING "(no irq)\n");
 298         } else {
 299                 printk(KERN_WARNING "(irq probe not implemented)\n");
 300         }
 301
 302         ret = alloc_subdevices(dev, 1);
 303         if (ret < 0)
 304                 return ret;
 305
 306         ret = alloc_private(dev, sizeof(struct dt2814_private));
 307         if (ret < 0)
 308                 return ret;
 309
 310         s = dev->subdevices + 0;
 311         dev->read_subdev = s;
 312         s->type = COMEDI_SUBD_AI;
 313         s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
 314         s->n_chan = 16;
 315         s->len_chanlist = 1;
 316         s->insn_read = dt2814_ai_insn_read;
 317         s->do_cmd = dt2814_ai_cmd;
 318         s->do_cmdtest = dt2814_ai_cmdtest;
 319         s->maxdata = 0xfff;
 320         s->range_table = &range_unknown;
 321
 322         return 0;
 323 }
 324
 325 static int dt2814_detach(struct comedi_device *dev)
 326 {
 327         printk(KERN_INFO "comedi%d: dt2814: remove\n", dev->minor);
 328
 329         if (dev->irq)
 330                 free_irq(dev->irq, dev);
 331
 332         if (dev->iobase)
 333                 release_region(dev->iobase, DT2814_SIZE);
 334
 335         return 0;
 336 }
 337
 338 static irqreturn_t dt2814_interrupt(int irq, void *d)
 339 {
 340         int lo, hi;
 341         struct comedi_device *dev = d;
 342         struct comedi_subdevice *s;
 343         int data;
 344
 345         if (!dev->attached) {
 346                 comedi_error(dev, "spurious interrupt");
 347                 return IRQ_HANDLED;
 348         }
 349
 350         s = dev->subdevices + 0;
 351
 352         hi = inb(dev->iobase + DT2814_DATA);
 353         lo = inb(dev->iobase + DT2814_DATA);
 354
 355         data = (hi << 4) | (lo >> 4);
 356
 357         if (!(--devpriv->ntrig)) {
 358                 int i;
 359
 360                 outb(0, dev->iobase + DT2814_CSR);
 361                 /* note: turning off timed mode triggers another
 362                    sample. */
 363
 364                 for (i = 0; i < DT2814_TIMEOUT; i++) {
 365                         if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
 366                                 break;
 367                 }
 368                 inb(dev->iobase + DT2814_DATA);
 369                 inb(dev->iobase + DT2814_DATA);
 370
 371                 s->async->events |= COMEDI_CB_EOA;
 372         }
 373         comedi_event(dev, s);
 374         return IRQ_HANDLED;
 375 }
 376
 377 MODULE_AUTHOR("Comedi http://www.comedi.org");
 378 MODULE_DESCRIPTION("Comedi low-level driver");
 379 MODULE_LICENSE("GPL");