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56#include <linux/module.h>
57#include "../comedidev.h"
58
59#include <asm/div64.h>
60
61#include <linux/timer.h>
62#include <linux/ktime.h>
63#include <linux/jiffies.h>
64#include <linux/device.h>
65#include <linux/kdev_t.h>
66
67#define N_CHANS 8
68#define DEV_NAME "comedi_testd"
69#define CLASS_NAME "comedi_test"
70
71static bool config_mode;
72static unsigned int set_amplitude;
73static unsigned int set_period;
74static struct class *ctcls;
75static struct device *ctdev;
76
77module_param_named(noauto, config_mode, bool, 0444);
78MODULE_PARM_DESC(noauto, "Disable auto-configuration: (1=disable [defaults to enable])");
79
80module_param_named(amplitude, set_amplitude, uint, 0444);
81MODULE_PARM_DESC(amplitude, "Set auto mode wave amplitude in microvolts: (defaults to 1 volt)");
82
83module_param_named(period, set_period, uint, 0444);
84MODULE_PARM_DESC(period, "Set auto mode wave period in microseconds: (defaults to 0.1 sec)");
85
86
87struct waveform_private {
88 struct timer_list ai_timer;
89 u64 ai_convert_time;
90 unsigned int wf_amplitude;
91 unsigned int wf_period;
92 unsigned int wf_current;
93 unsigned int ai_scan_period;
94 unsigned int ai_convert_period;
95 struct timer_list ao_timer;
96 u64 ao_last_scan_time;
97 unsigned int ao_scan_period;
98 unsigned short ao_loopbacks[N_CHANS];
99};
100
101
102static const struct comedi_lrange waveform_ai_ranges = {
103 2, {
104 BIP_RANGE(10),
105 BIP_RANGE(5)
106 }
107};
108
109static unsigned short fake_sawtooth(struct comedi_device *dev,
110 unsigned int range_index,
111 unsigned int current_time)
112{
113 struct waveform_private *devpriv = dev->private;
114 struct comedi_subdevice *s = dev->read_subdev;
115 unsigned int offset = s->maxdata / 2;
116 u64 value;
117 const struct comedi_krange *krange =
118 &s->range_table->range[range_index];
119 u64 binary_amplitude;
120
121 binary_amplitude = s->maxdata;
122 binary_amplitude *= devpriv->wf_amplitude;
123 do_div(binary_amplitude, krange->max - krange->min);
124
125 value = current_time;
126 value *= binary_amplitude * 2;
127 do_div(value, devpriv->wf_period);
128 value += offset;
129
130 if (value < binary_amplitude) {
131 value = 0;
132 } else {
133 value -= binary_amplitude;
134 if (value > s->maxdata)
135 value = s->maxdata;
136 }
137
138 return value;
139}
140
141static unsigned short fake_squarewave(struct comedi_device *dev,
142 unsigned int range_index,
143 unsigned int current_time)
144{
145 struct waveform_private *devpriv = dev->private;
146 struct comedi_subdevice *s = dev->read_subdev;
147 unsigned int offset = s->maxdata / 2;
148 u64 value;
149 const struct comedi_krange *krange =
150 &s->range_table->range[range_index];
151
152 value = s->maxdata;
153 value *= devpriv->wf_amplitude;
154 do_div(value, krange->max - krange->min);
155
156
157 if (current_time < devpriv->wf_period / 2) {
158 if (offset < value)
159 value = 0;
160 else
161 value = offset - value;
162 } else {
163 value += offset;
164 if (value > s->maxdata)
165 value = s->maxdata;
166 }
167
168 return value;
169}
170
171static unsigned short fake_flatline(struct comedi_device *dev,
172 unsigned int range_index,
173 unsigned int current_time)
174{
175 return dev->read_subdev->maxdata / 2;
176}
177
178
179static unsigned short fake_waveform(struct comedi_device *dev,
180 unsigned int channel, unsigned int range,
181 unsigned int current_time)
182{
183 enum {
184 SAWTOOTH_CHAN,
185 SQUARE_CHAN,
186 };
187 switch (channel) {
188 case SAWTOOTH_CHAN:
189 return fake_sawtooth(dev, range, current_time);
190 case SQUARE_CHAN:
191 return fake_squarewave(dev, range, current_time);
192 default:
193 break;
194 }
195
196 return fake_flatline(dev, range, current_time);
197}
198
199
200
201
202
203
204static void waveform_ai_timer(unsigned long arg)
205{
206 struct comedi_device *dev = (struct comedi_device *)arg;
207 struct waveform_private *devpriv = dev->private;
208 struct comedi_subdevice *s = dev->read_subdev;
209 struct comedi_async *async = s->async;
210 struct comedi_cmd *cmd = &async->cmd;
211 u64 now;
212 unsigned int nsamples;
213 unsigned int time_increment;
214
215 now = ktime_to_us(ktime_get());
216 nsamples = comedi_nsamples_left(s, UINT_MAX);
217
218 while (nsamples && devpriv->ai_convert_time < now) {
219 unsigned int chanspec = cmd->chanlist[async->cur_chan];
220 unsigned short sample;
221
222 sample = fake_waveform(dev, CR_CHAN(chanspec),
223 CR_RANGE(chanspec), devpriv->wf_current);
224 if (comedi_buf_write_samples(s, &sample, 1) == 0)
225 goto overrun;
226 time_increment = devpriv->ai_convert_period;
227 if (async->scan_progress == 0) {
228
229 time_increment += devpriv->ai_scan_period -
230 devpriv->ai_convert_period *
231 cmd->scan_end_arg;
232 }
233 devpriv->wf_current += time_increment;
234 if (devpriv->wf_current >= devpriv->wf_period)
235 devpriv->wf_current %= devpriv->wf_period;
236 devpriv->ai_convert_time += time_increment;
237 nsamples--;
238 }
239
240 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) {
241 async->events |= COMEDI_CB_EOA;
242 } else {
243 if (devpriv->ai_convert_time > now)
244 time_increment = devpriv->ai_convert_time - now;
245 else
246 time_increment = 1;
247 mod_timer(&devpriv->ai_timer,
248 jiffies + usecs_to_jiffies(time_increment));
249 }
250
251overrun:
252 comedi_handle_events(dev, s);
253}
254
255static int waveform_ai_cmdtest(struct comedi_device *dev,
256 struct comedi_subdevice *s,
257 struct comedi_cmd *cmd)
258{
259 int err = 0;
260 unsigned int arg, limit;
261
262
263
264 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
265 err |= comedi_check_trigger_src(&cmd->scan_begin_src,
266 TRIG_FOLLOW | TRIG_TIMER);
267 err |= comedi_check_trigger_src(&cmd->convert_src,
268 TRIG_NOW | TRIG_TIMER);
269 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
270 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
271
272 if (err)
273 return 1;
274
275
276
277 err |= comedi_check_trigger_is_unique(cmd->convert_src);
278 err |= comedi_check_trigger_is_unique(cmd->stop_src);
279
280
281
282 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
283 err |= -EINVAL;
284
285 if (err)
286 return 2;
287
288
289
290 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
291
292 if (cmd->convert_src == TRIG_NOW) {
293 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
294 } else {
295 if (cmd->scan_begin_src == TRIG_FOLLOW) {
296 err |= comedi_check_trigger_arg_min(&cmd->convert_arg,
297 NSEC_PER_USEC);
298 }
299 }
300
301 if (cmd->scan_begin_src == TRIG_FOLLOW) {
302 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
303 } else {
304 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
305 NSEC_PER_USEC);
306 }
307
308 err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1);
309 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
310 cmd->chanlist_len);
311
312 if (cmd->stop_src == TRIG_COUNT)
313 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
314 else
315 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
316
317 if (err)
318 return 3;
319
320
321
322 if (cmd->convert_src == TRIG_TIMER) {
323
324 arg = cmd->convert_arg;
325 arg = min(arg,
326 rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC));
327 arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC);
328 if (cmd->scan_begin_arg == TRIG_TIMER) {
329
330 limit = UINT_MAX / cmd->scan_end_arg;
331 limit = rounddown(limit, (unsigned int)NSEC_PER_SEC);
332 arg = min(arg, limit);
333 }
334 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
335 }
336
337 if (cmd->scan_begin_src == TRIG_TIMER) {
338
339 arg = cmd->scan_begin_arg;
340 arg = min(arg,
341 rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC));
342 arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC);
343 if (cmd->convert_src == TRIG_TIMER) {
344
345 arg = max(arg, cmd->convert_arg * cmd->scan_end_arg);
346 }
347 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
348 }
349
350 if (err)
351 return 4;
352
353 return 0;
354}
355
356static int waveform_ai_cmd(struct comedi_device *dev,
357 struct comedi_subdevice *s)
358{
359 struct waveform_private *devpriv = dev->private;
360 struct comedi_cmd *cmd = &s->async->cmd;
361 unsigned int first_convert_time;
362 u64 wf_current;
363
364 if (cmd->flags & CMDF_PRIORITY) {
365 dev_err(dev->class_dev,
366 "commands at RT priority not supported in this driver\n");
367 return -1;
368 }
369
370 if (cmd->convert_src == TRIG_NOW)
371 devpriv->ai_convert_period = 0;
372 else
373 devpriv->ai_convert_period = cmd->convert_arg / NSEC_PER_USEC;
374
375 if (cmd->scan_begin_src == TRIG_FOLLOW) {
376 devpriv->ai_scan_period = devpriv->ai_convert_period *
377 cmd->scan_end_arg;
378 } else {
379 devpriv->ai_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC;
380 }
381
382
383
384
385
386
387
388
389 first_convert_time = devpriv->ai_convert_period;
390 if (cmd->scan_begin_src == TRIG_TIMER)
391 first_convert_time += devpriv->ai_scan_period;
392 devpriv->ai_convert_time = ktime_to_us(ktime_get()) +
393 first_convert_time;
394
395
396 wf_current = devpriv->ai_convert_time;
397 devpriv->wf_current = do_div(wf_current, devpriv->wf_period);
398
399
400
401
402
403
404 devpriv->ai_timer.expires =
405 jiffies + usecs_to_jiffies(devpriv->ai_convert_period) + 1;
406 add_timer(&devpriv->ai_timer);
407 return 0;
408}
409
410static int waveform_ai_cancel(struct comedi_device *dev,
411 struct comedi_subdevice *s)
412{
413 struct waveform_private *devpriv = dev->private;
414
415 if (in_softirq()) {
416
417 del_timer(&devpriv->ai_timer);
418 } else {
419 del_timer_sync(&devpriv->ai_timer);
420 }
421 return 0;
422}
423
424static int waveform_ai_insn_read(struct comedi_device *dev,
425 struct comedi_subdevice *s,
426 struct comedi_insn *insn, unsigned int *data)
427{
428 struct waveform_private *devpriv = dev->private;
429 int i, chan = CR_CHAN(insn->chanspec);
430
431 for (i = 0; i < insn->n; i++)
432 data[i] = devpriv->ao_loopbacks[chan];
433
434 return insn->n;
435}
436
437
438
439
440
441static void waveform_ao_timer(unsigned long arg)
442{
443 struct comedi_device *dev = (struct comedi_device *)arg;
444 struct waveform_private *devpriv = dev->private;
445 struct comedi_subdevice *s = dev->write_subdev;
446 struct comedi_async *async = s->async;
447 struct comedi_cmd *cmd = &async->cmd;
448 u64 now;
449 u64 scans_since;
450 unsigned int scans_avail = 0;
451
452
453 now = ktime_to_us(ktime_get());
454 scans_since = now - devpriv->ao_last_scan_time;
455 do_div(scans_since, devpriv->ao_scan_period);
456 if (scans_since) {
457 unsigned int i;
458
459
460 scans_avail = comedi_nscans_left(s, 0);
461 if (scans_avail > scans_since)
462 scans_avail = scans_since;
463 if (scans_avail) {
464
465 if (scans_avail > 1) {
466 unsigned int skip_bytes, nbytes;
467
468 skip_bytes =
469 comedi_samples_to_bytes(s, cmd->scan_end_arg *
470 (scans_avail - 1));
471 nbytes = comedi_buf_read_alloc(s, skip_bytes);
472 comedi_buf_read_free(s, nbytes);
473 comedi_inc_scan_progress(s, nbytes);
474 if (nbytes < skip_bytes) {
475
476 async->events |= COMEDI_CB_OVERFLOW;
477 goto underrun;
478 }
479 }
480
481 for (i = 0; i < cmd->scan_end_arg; i++) {
482 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
483 unsigned short *pd;
484
485 pd = &devpriv->ao_loopbacks[chan];
486
487 if (!comedi_buf_read_samples(s, pd, 1)) {
488
489 async->events |= COMEDI_CB_OVERFLOW;
490 goto underrun;
491 }
492 }
493
494 devpriv->ao_last_scan_time +=
495 (u64)scans_avail * devpriv->ao_scan_period;
496 }
497 }
498 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) {
499 async->events |= COMEDI_CB_EOA;
500 } else if (scans_avail < scans_since) {
501 async->events |= COMEDI_CB_OVERFLOW;
502 } else {
503 unsigned int time_inc = devpriv->ao_last_scan_time +
504 devpriv->ao_scan_period - now;
505
506 mod_timer(&devpriv->ao_timer,
507 jiffies + usecs_to_jiffies(time_inc));
508 }
509
510underrun:
511 comedi_handle_events(dev, s);
512}
513
514static int waveform_ao_inttrig_start(struct comedi_device *dev,
515 struct comedi_subdevice *s,
516 unsigned int trig_num)
517{
518 struct waveform_private *devpriv = dev->private;
519 struct comedi_async *async = s->async;
520 struct comedi_cmd *cmd = &async->cmd;
521
522 if (trig_num != cmd->start_arg)
523 return -EINVAL;
524
525 async->inttrig = NULL;
526
527 devpriv->ao_last_scan_time = ktime_to_us(ktime_get());
528 devpriv->ao_timer.expires =
529 jiffies + usecs_to_jiffies(devpriv->ao_scan_period);
530 add_timer(&devpriv->ao_timer);
531
532 return 1;
533}
534
535static int waveform_ao_cmdtest(struct comedi_device *dev,
536 struct comedi_subdevice *s,
537 struct comedi_cmd *cmd)
538{
539 int err = 0;
540 unsigned int arg;
541
542
543
544 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
545 err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
546 err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
547 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
548 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
549
550 if (err)
551 return 1;
552
553
554
555 err |= comedi_check_trigger_is_unique(cmd->stop_src);
556
557
558
559 if (err)
560 return 2;
561
562
563
564 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
565 NSEC_PER_USEC);
566 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
567 err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1);
568 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
569 cmd->chanlist_len);
570 if (cmd->stop_src == TRIG_COUNT)
571 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
572 else
573 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
574
575 if (err)
576 return 3;
577
578
579
580
581 arg = cmd->scan_begin_arg;
582 arg = min(arg, rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC));
583 arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC);
584 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
585
586 if (err)
587 return 4;
588
589 return 0;
590}
591
592static int waveform_ao_cmd(struct comedi_device *dev,
593 struct comedi_subdevice *s)
594{
595 struct waveform_private *devpriv = dev->private;
596 struct comedi_cmd *cmd = &s->async->cmd;
597
598 if (cmd->flags & CMDF_PRIORITY) {
599 dev_err(dev->class_dev,
600 "commands at RT priority not supported in this driver\n");
601 return -1;
602 }
603
604 devpriv->ao_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC;
605 s->async->inttrig = waveform_ao_inttrig_start;
606 return 0;
607}
608
609static int waveform_ao_cancel(struct comedi_device *dev,
610 struct comedi_subdevice *s)
611{
612 struct waveform_private *devpriv = dev->private;
613
614 s->async->inttrig = NULL;
615 if (in_softirq()) {
616
617 del_timer(&devpriv->ao_timer);
618 } else {
619 del_timer_sync(&devpriv->ao_timer);
620 }
621 return 0;
622}
623
624static int waveform_ao_insn_write(struct comedi_device *dev,
625 struct comedi_subdevice *s,
626 struct comedi_insn *insn, unsigned int *data)
627{
628 struct waveform_private *devpriv = dev->private;
629 int i, chan = CR_CHAN(insn->chanspec);
630
631 for (i = 0; i < insn->n; i++)
632 devpriv->ao_loopbacks[chan] = data[i];
633
634 return insn->n;
635}
636
637static int waveform_common_attach(struct comedi_device *dev,
638 int amplitude, int period)
639{
640 struct waveform_private *devpriv;
641 struct comedi_subdevice *s;
642 int i;
643 int ret;
644
645 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
646 if (!devpriv)
647 return -ENOMEM;
648
649 devpriv->wf_amplitude = amplitude;
650 devpriv->wf_period = period;
651
652 ret = comedi_alloc_subdevices(dev, 2);
653 if (ret)
654 return ret;
655
656 s = &dev->subdevices[0];
657 dev->read_subdev = s;
658
659 s->type = COMEDI_SUBD_AI;
660 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
661 s->n_chan = N_CHANS;
662 s->maxdata = 0xffff;
663 s->range_table = &waveform_ai_ranges;
664 s->len_chanlist = s->n_chan * 2;
665 s->insn_read = waveform_ai_insn_read;
666 s->do_cmd = waveform_ai_cmd;
667 s->do_cmdtest = waveform_ai_cmdtest;
668 s->cancel = waveform_ai_cancel;
669
670 s = &dev->subdevices[1];
671 dev->write_subdev = s;
672
673 s->type = COMEDI_SUBD_AO;
674 s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE;
675 s->n_chan = N_CHANS;
676 s->maxdata = 0xffff;
677 s->range_table = &waveform_ai_ranges;
678 s->len_chanlist = s->n_chan;
679 s->insn_write = waveform_ao_insn_write;
680 s->insn_read = waveform_ai_insn_read;
681 s->do_cmd = waveform_ao_cmd;
682 s->do_cmdtest = waveform_ao_cmdtest;
683 s->cancel = waveform_ao_cancel;
684
685
686 for (i = 0; i < s->n_chan; i++)
687 devpriv->ao_loopbacks[i] = s->maxdata / 2;
688
689 setup_timer(&devpriv->ai_timer, waveform_ai_timer, (unsigned long)dev);
690 setup_timer(&devpriv->ao_timer, waveform_ao_timer, (unsigned long)dev);
691
692 dev_info(dev->class_dev,
693 "%s: %u microvolt, %u microsecond waveform attached\n",
694 dev->board_name,
695 devpriv->wf_amplitude, devpriv->wf_period);
696
697 return 0;
698}
699
700static int waveform_attach(struct comedi_device *dev,
701 struct comedi_devconfig *it)
702{
703 int amplitude = it->options[0];
704 int period = it->options[1];
705
706
707 if (amplitude <= 0)
708 amplitude = 1000000;
709 if (period <= 0)
710 period = 100000;
711
712 return waveform_common_attach(dev, amplitude, period);
713}
714
715static int waveform_auto_attach(struct comedi_device *dev,
716 unsigned long context_unused)
717{
718 int amplitude = set_amplitude;
719 int period = set_period;
720
721
722 if (!amplitude)
723 amplitude = 1000000;
724 if (!period)
725 period = 100000;
726
727 return waveform_common_attach(dev, amplitude, period);
728}
729
730static void waveform_detach(struct comedi_device *dev)
731{
732 struct waveform_private *devpriv = dev->private;
733
734 if (devpriv) {
735 del_timer_sync(&devpriv->ai_timer);
736 del_timer_sync(&devpriv->ao_timer);
737 }
738}
739
740static struct comedi_driver waveform_driver = {
741 .driver_name = "comedi_test",
742 .module = THIS_MODULE,
743 .attach = waveform_attach,
744 .auto_attach = waveform_auto_attach,
745 .detach = waveform_detach,
746};
747
748
749
750
751
752static int __init comedi_test_init(void)
753{
754 int ret;
755
756 ret = comedi_driver_register(&waveform_driver);
757 if (ret) {
758 pr_err("comedi_test: unable to register driver\n");
759 return ret;
760 }
761
762 if (!config_mode) {
763 ctcls = class_create(THIS_MODULE, CLASS_NAME);
764 if (IS_ERR(ctcls)) {
765 pr_warn("comedi_test: unable to create class\n");
766 goto clean3;
767 }
768
769 ctdev = device_create(ctcls, NULL, MKDEV(0, 0), NULL, DEV_NAME);
770 if (IS_ERR(ctdev)) {
771 pr_warn("comedi_test: unable to create device\n");
772 goto clean2;
773 }
774
775 ret = comedi_auto_config(ctdev, &waveform_driver, 0);
776 if (ret) {
777 pr_warn("comedi_test: unable to auto-configure device\n");
778 goto clean;
779 }
780 }
781
782 return 0;
783
784clean:
785 device_destroy(ctcls, MKDEV(0, 0));
786clean2:
787 class_destroy(ctcls);
788 ctdev = NULL;
789clean3:
790 ctcls = NULL;
791
792 return 0;
793}
794module_init(comedi_test_init);
795
796static void __exit comedi_test_exit(void)
797{
798 if (ctdev)
799 comedi_auto_unconfig(ctdev);
800
801 if (ctcls) {
802 device_destroy(ctcls, MKDEV(0, 0));
803 class_destroy(ctcls);
804 }
805
806 comedi_driver_unregister(&waveform_driver);
807}
808module_exit(comedi_test_exit);
809
810MODULE_AUTHOR("Comedi http://www.comedi.org");
811MODULE_DESCRIPTION("Comedi low-level driver");
812MODULE_LICENSE("GPL");
813