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25#include <linux/module.h>
26#include <linux/interrupt.h>
27#include <linux/comedi/comedidev.h>
28#include <linux/comedi/comedi_8254.h>
29
30
31
32
33#define DAS6402_AI_DATA_REG 0x00
34#define DAS6402_AI_MUX_REG 0x02
35#define DAS6402_AI_MUX_LO(x) (((x) & 0x3f) << 0)
36#define DAS6402_AI_MUX_HI(x) (((x) & 0x3f) << 8)
37#define DAS6402_DI_DO_REG 0x03
38#define DAS6402_AO_DATA_REG(x) (0x04 + ((x) * 2))
39#define DAS6402_AO_LSB_REG(x) (0x04 + ((x) * 2))
40#define DAS6402_AO_MSB_REG(x) (0x05 + ((x) * 2))
41#define DAS6402_STATUS_REG 0x08
42#define DAS6402_STATUS_FFNE BIT(0)
43#define DAS6402_STATUS_FHALF BIT(1)
44#define DAS6402_STATUS_FFULL BIT(2)
45#define DAS6402_STATUS_XINT BIT(3)
46#define DAS6402_STATUS_INT BIT(4)
47#define DAS6402_STATUS_XTRIG BIT(5)
48#define DAS6402_STATUS_INDGT BIT(6)
49#define DAS6402_STATUS_10MHZ BIT(7)
50#define DAS6402_STATUS_W_CLRINT BIT(0)
51#define DAS6402_STATUS_W_CLRXTR BIT(1)
52#define DAS6402_STATUS_W_CLRXIN BIT(2)
53#define DAS6402_STATUS_W_EXTEND BIT(4)
54#define DAS6402_STATUS_W_ARMED BIT(5)
55#define DAS6402_STATUS_W_POSTMODE BIT(6)
56#define DAS6402_STATUS_W_10MHZ BIT(7)
57#define DAS6402_CTRL_REG 0x09
58#define DAS6402_CTRL_TRIG(x) ((x) << 0)
59#define DAS6402_CTRL_SOFT_TRIG DAS6402_CTRL_TRIG(0)
60#define DAS6402_CTRL_EXT_FALL_TRIG DAS6402_CTRL_TRIG(1)
61#define DAS6402_CTRL_EXT_RISE_TRIG DAS6402_CTRL_TRIG(2)
62#define DAS6402_CTRL_PACER_TRIG DAS6402_CTRL_TRIG(3)
63#define DAS6402_CTRL_BURSTEN BIT(2)
64#define DAS6402_CTRL_XINTE BIT(3)
65#define DAS6402_CTRL_IRQ(x) ((x) << 4)
66#define DAS6402_CTRL_INTE BIT(7)
67#define DAS6402_TRIG_REG 0x0a
68#define DAS6402_TRIG_TGEN BIT(0)
69#define DAS6402_TRIG_TGSEL BIT(1)
70#define DAS6402_TRIG_TGPOL BIT(2)
71#define DAS6402_TRIG_PRETRIG BIT(3)
72#define DAS6402_AO_RANGE(_chan, _range) ((_range) << ((_chan) ? 6 : 4))
73#define DAS6402_AO_RANGE_MASK(_chan) (3 << ((_chan) ? 6 : 4))
74#define DAS6402_MODE_REG 0x0b
75#define DAS6402_MODE_RANGE(x) ((x) << 2)
76#define DAS6402_MODE_POLLED DAS6402_MODE_RANGE(0)
77#define DAS6402_MODE_FIFONEPTY DAS6402_MODE_RANGE(1)
78#define DAS6402_MODE_FIFOHFULL DAS6402_MODE_RANGE(2)
79#define DAS6402_MODE_EOB DAS6402_MODE_RANGE(3)
80#define DAS6402_MODE_ENHANCED BIT(4)
81#define DAS6402_MODE_SE BIT(5)
82#define DAS6402_MODE_UNI BIT(6)
83#define DAS6402_MODE_DMA(x) ((x) << 7)
84#define DAS6402_MODE_DMA1 DAS6402_MODE_DMA(0)
85#define DAS6402_MODE_DMA3 DAS6402_MODE_DMA(1)
86#define DAS6402_TIMER_BASE 0x0c
87
88static const struct comedi_lrange das6402_ai_ranges = {
89 8, {
90 BIP_RANGE(10),
91 BIP_RANGE(5),
92 BIP_RANGE(2.5),
93 BIP_RANGE(1.25),
94 UNI_RANGE(10),
95 UNI_RANGE(5),
96 UNI_RANGE(2.5),
97 UNI_RANGE(1.25)
98 }
99};
100
101
102
103
104
105
106static const struct comedi_lrange das6402_ao_ranges = {
107 4, {
108 BIP_RANGE(5),
109 BIP_RANGE(10),
110 UNI_RANGE(5),
111 UNI_RANGE(10)
112 }
113};
114
115struct das6402_boardinfo {
116 const char *name;
117 unsigned int maxdata;
118};
119
120static struct das6402_boardinfo das6402_boards[] = {
121 {
122 .name = "das6402-12",
123 .maxdata = 0x0fff,
124 }, {
125 .name = "das6402-16",
126 .maxdata = 0xffff,
127 },
128};
129
130struct das6402_private {
131 unsigned int irq;
132 unsigned int ao_range;
133};
134
135static void das6402_set_mode(struct comedi_device *dev,
136 unsigned int mode)
137{
138 outb(DAS6402_MODE_ENHANCED | mode, dev->iobase + DAS6402_MODE_REG);
139}
140
141static void das6402_set_extended(struct comedi_device *dev,
142 unsigned int val)
143{
144 outb(DAS6402_STATUS_W_EXTEND, dev->iobase + DAS6402_STATUS_REG);
145 outb(DAS6402_STATUS_W_EXTEND | val, dev->iobase + DAS6402_STATUS_REG);
146 outb(val, dev->iobase + DAS6402_STATUS_REG);
147}
148
149static void das6402_clear_all_interrupts(struct comedi_device *dev)
150{
151 outb(DAS6402_STATUS_W_CLRINT |
152 DAS6402_STATUS_W_CLRXTR |
153 DAS6402_STATUS_W_CLRXIN, dev->iobase + DAS6402_STATUS_REG);
154}
155
156static void das6402_ai_clear_eoc(struct comedi_device *dev)
157{
158 outb(DAS6402_STATUS_W_CLRINT, dev->iobase + DAS6402_STATUS_REG);
159}
160
161static unsigned int das6402_ai_read_sample(struct comedi_device *dev,
162 struct comedi_subdevice *s)
163{
164 unsigned int val;
165
166 val = inw(dev->iobase + DAS6402_AI_DATA_REG);
167 if (s->maxdata == 0x0fff)
168 val >>= 4;
169 return val;
170}
171
172static irqreturn_t das6402_interrupt(int irq, void *d)
173{
174 struct comedi_device *dev = d;
175 struct comedi_subdevice *s = dev->read_subdev;
176 struct comedi_async *async = s->async;
177 struct comedi_cmd *cmd = &async->cmd;
178 unsigned int status;
179
180 status = inb(dev->iobase + DAS6402_STATUS_REG);
181 if ((status & DAS6402_STATUS_INT) == 0)
182 return IRQ_NONE;
183
184 if (status & DAS6402_STATUS_FFULL) {
185 async->events |= COMEDI_CB_OVERFLOW;
186 } else if (status & DAS6402_STATUS_FFNE) {
187 unsigned short val;
188
189 val = das6402_ai_read_sample(dev, s);
190 comedi_buf_write_samples(s, &val, 1);
191
192 if (cmd->stop_src == TRIG_COUNT &&
193 async->scans_done >= cmd->stop_arg)
194 async->events |= COMEDI_CB_EOA;
195 }
196
197 das6402_clear_all_interrupts(dev);
198
199 comedi_handle_events(dev, s);
200
201 return IRQ_HANDLED;
202}
203
204static void das6402_ai_set_mode(struct comedi_device *dev,
205 struct comedi_subdevice *s,
206 unsigned int chanspec,
207 unsigned int mode)
208{
209 unsigned int range = CR_RANGE(chanspec);
210 unsigned int aref = CR_AREF(chanspec);
211
212 mode |= DAS6402_MODE_RANGE(range);
213 if (aref == AREF_GROUND)
214 mode |= DAS6402_MODE_SE;
215 if (comedi_range_is_unipolar(s, range))
216 mode |= DAS6402_MODE_UNI;
217
218 das6402_set_mode(dev, mode);
219}
220
221static int das6402_ai_cmd(struct comedi_device *dev,
222 struct comedi_subdevice *s)
223{
224 struct das6402_private *devpriv = dev->private;
225 struct comedi_cmd *cmd = &s->async->cmd;
226 unsigned int chan_lo = CR_CHAN(cmd->chanlist[0]);
227 unsigned int chan_hi = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
228
229 das6402_ai_set_mode(dev, s, cmd->chanlist[0], DAS6402_MODE_FIFONEPTY);
230
231
232 outw(DAS6402_AI_MUX_HI(chan_hi) | DAS6402_AI_MUX_LO(chan_lo),
233 dev->iobase + DAS6402_AI_MUX_REG);
234
235 comedi_8254_update_divisors(dev->pacer);
236 comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
237
238
239 outb(DAS6402_CTRL_INTE |
240 DAS6402_CTRL_IRQ(devpriv->irq) |
241 DAS6402_CTRL_PACER_TRIG, dev->iobase + DAS6402_CTRL_REG);
242
243 return 0;
244}
245
246static int das6402_ai_check_chanlist(struct comedi_device *dev,
247 struct comedi_subdevice *s,
248 struct comedi_cmd *cmd)
249{
250 unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
251 unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
252 unsigned int aref0 = CR_AREF(cmd->chanlist[0]);
253 int i;
254
255 for (i = 1; i < cmd->chanlist_len; i++) {
256 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
257 unsigned int range = CR_RANGE(cmd->chanlist[i]);
258 unsigned int aref = CR_AREF(cmd->chanlist[i]);
259
260 if (chan != chan0 + i) {
261 dev_dbg(dev->class_dev,
262 "chanlist must be consecutive\n");
263 return -EINVAL;
264 }
265
266 if (range != range0) {
267 dev_dbg(dev->class_dev,
268 "chanlist must have the same range\n");
269 return -EINVAL;
270 }
271
272 if (aref != aref0) {
273 dev_dbg(dev->class_dev,
274 "chanlist must have the same reference\n");
275 return -EINVAL;
276 }
277
278 if (aref0 == AREF_DIFF && chan > (s->n_chan / 2)) {
279 dev_dbg(dev->class_dev,
280 "chanlist differential channel too large\n");
281 return -EINVAL;
282 }
283 }
284 return 0;
285}
286
287static int das6402_ai_cmdtest(struct comedi_device *dev,
288 struct comedi_subdevice *s,
289 struct comedi_cmd *cmd)
290{
291 int err = 0;
292 unsigned int arg;
293
294
295
296 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
297 err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_FOLLOW);
298 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
299 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
300 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
301
302 if (err)
303 return 1;
304
305
306
307 err |= comedi_check_trigger_is_unique(cmd->stop_src);
308
309
310
311 if (err)
312 return 2;
313
314
315
316 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
317 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
318 err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 10000);
319 err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1);
320 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
321 cmd->chanlist_len);
322
323 if (cmd->stop_src == TRIG_COUNT)
324 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
325 else
326 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
327
328 if (err)
329 return 3;
330
331
332
333 arg = cmd->convert_arg;
334 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
335 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
336
337 if (err)
338 return 4;
339
340
341 if (cmd->chanlist && cmd->chanlist_len > 0)
342 err |= das6402_ai_check_chanlist(dev, s, cmd);
343
344 if (err)
345 return 5;
346
347 return 0;
348}
349
350static int das6402_ai_cancel(struct comedi_device *dev,
351 struct comedi_subdevice *s)
352{
353 outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
354
355 return 0;
356}
357
358static void das6402_ai_soft_trig(struct comedi_device *dev)
359{
360 outw(0, dev->iobase + DAS6402_AI_DATA_REG);
361}
362
363static int das6402_ai_eoc(struct comedi_device *dev,
364 struct comedi_subdevice *s,
365 struct comedi_insn *insn,
366 unsigned long context)
367{
368 unsigned int status;
369
370 status = inb(dev->iobase + DAS6402_STATUS_REG);
371 if (status & DAS6402_STATUS_FFNE)
372 return 0;
373 return -EBUSY;
374}
375
376static int das6402_ai_insn_read(struct comedi_device *dev,
377 struct comedi_subdevice *s,
378 struct comedi_insn *insn,
379 unsigned int *data)
380{
381 unsigned int chan = CR_CHAN(insn->chanspec);
382 unsigned int aref = CR_AREF(insn->chanspec);
383 int ret;
384 int i;
385
386 if (aref == AREF_DIFF && chan > (s->n_chan / 2))
387 return -EINVAL;
388
389
390 outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
391
392 das6402_ai_set_mode(dev, s, insn->chanspec, DAS6402_MODE_POLLED);
393
394
395 outw(DAS6402_AI_MUX_HI(chan) | DAS6402_AI_MUX_LO(chan),
396 dev->iobase + DAS6402_AI_MUX_REG);
397
398 for (i = 0; i < insn->n; i++) {
399 das6402_ai_clear_eoc(dev);
400 das6402_ai_soft_trig(dev);
401
402 ret = comedi_timeout(dev, s, insn, das6402_ai_eoc, 0);
403 if (ret)
404 break;
405
406 data[i] = das6402_ai_read_sample(dev, s);
407 }
408
409 das6402_ai_clear_eoc(dev);
410
411 return insn->n;
412}
413
414static int das6402_ao_insn_write(struct comedi_device *dev,
415 struct comedi_subdevice *s,
416 struct comedi_insn *insn,
417 unsigned int *data)
418{
419 struct das6402_private *devpriv = dev->private;
420 unsigned int chan = CR_CHAN(insn->chanspec);
421 unsigned int range = CR_RANGE(insn->chanspec);
422 unsigned int val;
423 int i;
424
425
426 val = devpriv->ao_range;
427 val &= ~DAS6402_AO_RANGE_MASK(chan);
428 val |= DAS6402_AO_RANGE(chan, range);
429 if (val != devpriv->ao_range) {
430 devpriv->ao_range = val;
431 outb(val, dev->iobase + DAS6402_TRIG_REG);
432 }
433
434
435
436
437
438
439
440
441
442
443
444
445
446 for (i = 0; i < insn->n; i++) {
447 val = data[i];
448
449 s->readback[chan] = val;
450
451 if (s->maxdata == 0x0fff) {
452
453
454
455
456
457 val <<= 4;
458 outw(val, dev->iobase + DAS6402_AO_DATA_REG(chan));
459 } else {
460
461
462
463
464 outb(val & 0xff,
465 dev->iobase + DAS6402_AO_LSB_REG(chan));
466 outb((val >> 8) & 0xff,
467 dev->iobase + DAS6402_AO_LSB_REG(chan));
468 }
469 }
470
471 return insn->n;
472}
473
474static int das6402_ao_insn_read(struct comedi_device *dev,
475 struct comedi_subdevice *s,
476 struct comedi_insn *insn,
477 unsigned int *data)
478{
479 unsigned int chan = CR_CHAN(insn->chanspec);
480
481
482
483
484
485 inw(dev->iobase + DAS6402_AO_LSB_REG(chan));
486
487 return comedi_readback_insn_read(dev, s, insn, data);
488}
489
490static int das6402_di_insn_bits(struct comedi_device *dev,
491 struct comedi_subdevice *s,
492 struct comedi_insn *insn,
493 unsigned int *data)
494{
495 data[1] = inb(dev->iobase + DAS6402_DI_DO_REG);
496
497 return insn->n;
498}
499
500static int das6402_do_insn_bits(struct comedi_device *dev,
501 struct comedi_subdevice *s,
502 struct comedi_insn *insn,
503 unsigned int *data)
504{
505 if (comedi_dio_update_state(s, data))
506 outb(s->state, dev->iobase + DAS6402_DI_DO_REG);
507
508 data[1] = s->state;
509
510 return insn->n;
511}
512
513static void das6402_reset(struct comedi_device *dev)
514{
515 struct das6402_private *devpriv = dev->private;
516
517
518 outb(DAS6402_MODE_ENHANCED, dev->iobase + DAS6402_MODE_REG);
519
520
521 das6402_set_extended(dev, DAS6402_STATUS_W_10MHZ);
522
523
524 outb(DAS6402_CTRL_SOFT_TRIG, dev->iobase + DAS6402_CTRL_REG);
525
526
527 das6402_set_mode(dev, DAS6402_MODE_RANGE(0) |
528 DAS6402_MODE_POLLED |
529 DAS6402_MODE_SE |
530 DAS6402_MODE_UNI);
531
532
533 outw(DAS6402_AI_MUX_HI(0) | DAS6402_AI_MUX_LO(0),
534 dev->iobase + DAS6402_AI_MUX_REG);
535
536
537 devpriv->ao_range = DAS6402_AO_RANGE(0, 2) | DAS6402_AO_RANGE(1, 2);
538 outb(devpriv->ao_range, dev->iobase + DAS6402_TRIG_REG);
539
540
541 outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
542 outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
543 inw(dev->iobase + DAS6402_AO_LSB_REG(0));
544
545
546 outb(0, dev->iobase + DAS6402_DI_DO_REG);
547
548 das6402_clear_all_interrupts(dev);
549}
550
551static int das6402_attach(struct comedi_device *dev,
552 struct comedi_devconfig *it)
553{
554 const struct das6402_boardinfo *board = dev->board_ptr;
555 struct das6402_private *devpriv;
556 struct comedi_subdevice *s;
557 int ret;
558
559 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
560 if (!devpriv)
561 return -ENOMEM;
562
563 ret = comedi_request_region(dev, it->options[0], 0x10);
564 if (ret)
565 return ret;
566
567 das6402_reset(dev);
568
569
570 if ((1 << it->options[1]) & 0x8cec) {
571 ret = request_irq(it->options[1], das6402_interrupt, 0,
572 dev->board_name, dev);
573 if (ret == 0) {
574 dev->irq = it->options[1];
575
576 switch (dev->irq) {
577 case 10:
578 devpriv->irq = 4;
579 break;
580 case 11:
581 devpriv->irq = 1;
582 break;
583 case 15:
584 devpriv->irq = 6;
585 break;
586 default:
587 devpriv->irq = dev->irq;
588 break;
589 }
590 }
591 }
592
593 dev->pacer = comedi_8254_init(dev->iobase + DAS6402_TIMER_BASE,
594 I8254_OSC_BASE_10MHZ, I8254_IO8, 0);
595 if (!dev->pacer)
596 return -ENOMEM;
597
598 ret = comedi_alloc_subdevices(dev, 4);
599 if (ret)
600 return ret;
601
602
603 s = &dev->subdevices[0];
604 s->type = COMEDI_SUBD_AI;
605 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
606 s->n_chan = 64;
607 s->maxdata = board->maxdata;
608 s->range_table = &das6402_ai_ranges;
609 s->insn_read = das6402_ai_insn_read;
610 if (dev->irq) {
611 dev->read_subdev = s;
612 s->subdev_flags |= SDF_CMD_READ;
613 s->len_chanlist = s->n_chan;
614 s->do_cmdtest = das6402_ai_cmdtest;
615 s->do_cmd = das6402_ai_cmd;
616 s->cancel = das6402_ai_cancel;
617 }
618
619
620 s = &dev->subdevices[1];
621 s->type = COMEDI_SUBD_AO;
622 s->subdev_flags = SDF_WRITABLE;
623 s->n_chan = 2;
624 s->maxdata = board->maxdata;
625 s->range_table = &das6402_ao_ranges;
626 s->insn_write = das6402_ao_insn_write;
627 s->insn_read = das6402_ao_insn_read;
628
629 ret = comedi_alloc_subdev_readback(s);
630 if (ret)
631 return ret;
632
633
634 s = &dev->subdevices[2];
635 s->type = COMEDI_SUBD_DI;
636 s->subdev_flags = SDF_READABLE;
637 s->n_chan = 8;
638 s->maxdata = 1;
639 s->range_table = &range_digital;
640 s->insn_bits = das6402_di_insn_bits;
641
642
643 s = &dev->subdevices[3];
644 s->type = COMEDI_SUBD_DO;
645 s->subdev_flags = SDF_WRITABLE;
646 s->n_chan = 8;
647 s->maxdata = 1;
648 s->range_table = &range_digital;
649 s->insn_bits = das6402_do_insn_bits;
650
651 return 0;
652}
653
654static struct comedi_driver das6402_driver = {
655 .driver_name = "das6402",
656 .module = THIS_MODULE,
657 .attach = das6402_attach,
658 .detach = comedi_legacy_detach,
659 .board_name = &das6402_boards[0].name,
660 .num_names = ARRAY_SIZE(das6402_boards),
661 .offset = sizeof(struct das6402_boardinfo),
662};
663module_comedi_driver(das6402_driver)
664
665MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
666MODULE_DESCRIPTION("Comedi driver for DAS6402 compatible boards");
667MODULE_LICENSE("GPL");
668
