2 * comedi/drivers/comedi_test.c
4 * Generates fake waveform signals that can be read through
5 * the command interface. It does _not_ read from any board;
6 * it just generates deterministic waveforms.
7 * Useful for various testing purposes.
9 * Copyright (C) 2002 Joachim Wuttke <Joachim.Wuttke@icn.siemens.de>
10 * Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net>
12 * COMEDI - Linux Control and Measurement Device Interface
13 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
28 * Description: generates fake waveforms
29 * Author: Joachim Wuttke <Joachim.Wuttke@icn.siemens.de>, Frank Mori Hess
30 * <fmhess@users.sourceforge.net>, ds
33 * Updated: Sat, 16 Mar 2002 17:34:48 -0800
35 * This driver is mainly for testing purposes, but can also be used to
36 * generate sample waveforms on systems that don't have data acquisition
39 * Auto-configuration is the default mode if no parameter is supplied during
40 * module loading. Manual configuration requires COMEDI userspace tool.
41 * To disable auto-configuration mode, pass "noauto=1" parameter for module
42 * loading. Refer modinfo or MODULE_PARM_DESC description below for details.
44 * Auto-configuration options:
45 * Refer modinfo or MODULE_PARM_DESC description below for details.
47 * Manual configuration options:
48 * [0] - Amplitude in microvolts for fake waveforms (default 1 volt)
49 * [1] - Period in microseconds for fake waveforms (default 0.1 sec)
51 * Generates a sawtooth wave on channel 0, square wave on channel 1, additional
52 * waveforms could be added to other channels (currently they return flatline
56 #include <linux/module.h>
57 #include "../comedidev.h"
59 #include <asm/div64.h>
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>
68 #define DEV_NAME "comedi_testd"
69 #define CLASS_NAME "comedi_test"
71 static bool config_mode;
72 static unsigned int set_amplitude;
73 static unsigned int set_period;
74 static struct class *ctcls;
75 static struct device *ctdev;
77 module_param_named(noauto, config_mode, bool, 0444);
78 MODULE_PARM_DESC(noauto, "Disable auto-configuration: (1=disable [defaults to enable])");
80 module_param_named(amplitude, set_amplitude, uint, 0444);
81 MODULE_PARM_DESC(amplitude, "Set auto mode wave amplitude in microvolts: (defaults to 1 volt)");
83 module_param_named(period, set_period, uint, 0444);
84 MODULE_PARM_DESC(period, "Set auto mode wave period in microseconds: (defaults to 0.1 sec)");
86 /* Data unique to this driver */
87 struct waveform_private {
88 struct timer_list ai_timer; /* timer for AI commands */
89 u64 ai_convert_time; /* time of next AI conversion in usec */
90 unsigned int wf_amplitude; /* waveform amplitude in microvolts */
91 unsigned int wf_period; /* waveform period in microseconds */
92 unsigned int wf_current; /* current time in waveform period */
93 unsigned int ai_scan_period; /* AI scan period in usec */
94 unsigned int ai_convert_period; /* AI conversion period in usec */
95 struct timer_list ao_timer; /* timer for AO commands */
96 u64 ao_last_scan_time; /* time of previous AO scan in usec */
97 unsigned int ao_scan_period; /* AO scan period in usec */
98 unsigned short ao_loopbacks[N_CHANS];
101 /* fake analog input ranges */
102 static const struct comedi_lrange waveform_ai_ranges = {
109 static unsigned short fake_sawtooth(struct comedi_device *dev,
110 unsigned int range_index,
111 unsigned int current_time)
113 struct waveform_private *devpriv = dev->private;
114 struct comedi_subdevice *s = dev->read_subdev;
115 unsigned int offset = s->maxdata / 2;
117 const struct comedi_krange *krange =
118 &s->range_table->range[range_index];
119 u64 binary_amplitude;
121 binary_amplitude = s->maxdata;
122 binary_amplitude *= devpriv->wf_amplitude;
123 do_div(binary_amplitude, krange->max - krange->min);
125 value = current_time;
126 value *= binary_amplitude * 2;
127 do_div(value, devpriv->wf_period);
129 /* get rid of sawtooth's dc offset and clamp value */
130 if (value < binary_amplitude) {
131 value = 0; /* negative saturation */
133 value -= binary_amplitude;
134 if (value > s->maxdata)
135 value = s->maxdata; /* positive saturation */
141 static unsigned short fake_squarewave(struct comedi_device *dev,
142 unsigned int range_index,
143 unsigned int current_time)
145 struct waveform_private *devpriv = dev->private;
146 struct comedi_subdevice *s = dev->read_subdev;
147 unsigned int offset = s->maxdata / 2;
149 const struct comedi_krange *krange =
150 &s->range_table->range[range_index];
153 value *= devpriv->wf_amplitude;
154 do_div(value, krange->max - krange->min);
156 /* get one of two values for square-wave and clamp */
157 if (current_time < devpriv->wf_period / 2) {
159 value = 0; /* negative saturation */
161 value = offset - value;
164 if (value > s->maxdata)
165 value = s->maxdata; /* positive saturation */
171 static unsigned short fake_flatline(struct comedi_device *dev,
172 unsigned int range_index,
173 unsigned int current_time)
175 return dev->read_subdev->maxdata / 2;
178 /* generates a different waveform depending on what channel is read */
179 static unsigned short fake_waveform(struct comedi_device *dev,
180 unsigned int channel, unsigned int range,
181 unsigned int current_time)
189 return fake_sawtooth(dev, range, current_time);
191 return fake_squarewave(dev, range, current_time);
196 return fake_flatline(dev, range, current_time);
200 * This is the background routine used to generate arbitrary data.
201 * It should run in the background; therefore it is scheduled by
204 static void waveform_ai_timer(unsigned long arg)
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;
212 unsigned int nsamples;
213 unsigned int time_increment;
215 now = ktime_to_us(ktime_get());
216 nsamples = comedi_nsamples_left(s, UINT_MAX);
218 while (nsamples && devpriv->ai_convert_time < now) {
219 unsigned int chanspec = cmd->chanlist[async->cur_chan];
220 unsigned short sample;
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)
226 time_increment = devpriv->ai_convert_period;
227 if (async->scan_progress == 0) {
228 /* done last conversion in scan, so add dead time */
229 time_increment += devpriv->ai_scan_period -
230 devpriv->ai_convert_period *
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;
240 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) {
241 async->events |= COMEDI_CB_EOA;
243 if (devpriv->ai_convert_time > now)
244 time_increment = devpriv->ai_convert_time - now;
247 mod_timer(&devpriv->ai_timer,
248 jiffies + usecs_to_jiffies(time_increment));
252 comedi_handle_events(dev, s);
255 static int waveform_ai_cmdtest(struct comedi_device *dev,
256 struct comedi_subdevice *s,
257 struct comedi_cmd *cmd)
260 unsigned int arg, limit;
262 /* Step 1 : check if triggers are trivially valid */
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);
275 /* Step 2a : make sure trigger sources are unique */
277 err |= comedi_check_trigger_is_unique(cmd->convert_src);
278 err |= comedi_check_trigger_is_unique(cmd->stop_src);
280 /* Step 2b : and mutually compatible */
282 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
283 err |= -EINVAL; /* scan period would be 0 */
288 /* Step 3: check if arguments are trivially valid */
290 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
292 if (cmd->convert_src == TRIG_NOW) {
293 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
294 } else { /* cmd->convert_src == TRIG_TIMER */
295 if (cmd->scan_begin_src == TRIG_FOLLOW) {
296 err |= comedi_check_trigger_arg_min(&cmd->convert_arg,
301 if (cmd->scan_begin_src == TRIG_FOLLOW) {
302 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
303 } else { /* cmd->scan_begin_src == TRIG_TIMER */
304 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
308 err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1);
309 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
312 if (cmd->stop_src == TRIG_COUNT)
313 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
314 else /* cmd->stop_src == TRIG_NONE */
315 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
320 /* step 4: fix up any arguments */
322 if (cmd->convert_src == TRIG_TIMER) {
323 /* round convert_arg to nearest microsecond */
324 arg = cmd->convert_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 /* limit convert_arg to keep scan_begin_arg in range */
330 limit = UINT_MAX / cmd->scan_end_arg;
331 limit = rounddown(limit, (unsigned int)NSEC_PER_SEC);
332 arg = min(arg, limit);
334 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
337 if (cmd->scan_begin_src == TRIG_TIMER) {
338 /* round scan_begin_arg to nearest microsecond */
339 arg = cmd->scan_begin_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 /* but ensure scan_begin_arg is large enough */
345 arg = max(arg, cmd->convert_arg * cmd->scan_end_arg);
347 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
356 static int waveform_ai_cmd(struct comedi_device *dev,
357 struct comedi_subdevice *s)
359 struct waveform_private *devpriv = dev->private;
360 struct comedi_cmd *cmd = &s->async->cmd;
361 unsigned int first_convert_time;
364 if (cmd->flags & CMDF_PRIORITY) {
365 dev_err(dev->class_dev,
366 "commands at RT priority not supported in this driver\n");
370 if (cmd->convert_src == TRIG_NOW)
371 devpriv->ai_convert_period = 0;
372 else /* cmd->convert_src == TRIG_TIMER */
373 devpriv->ai_convert_period = cmd->convert_arg / NSEC_PER_USEC;
375 if (cmd->scan_begin_src == TRIG_FOLLOW) {
376 devpriv->ai_scan_period = devpriv->ai_convert_period *
378 } else { /* cmd->scan_begin_src == TRIG_TIMER */
379 devpriv->ai_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC;
383 * Simulate first conversion to occur at convert period after
384 * conversion timer starts. If scan_begin_src is TRIG_FOLLOW, assume
385 * the conversion timer starts immediately. If scan_begin_src is
386 * TRIG_TIMER, assume the conversion timer starts after the scan
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()) +
395 /* Determine time within waveform period at time of conversion. */
396 wf_current = devpriv->ai_convert_time;
397 devpriv->wf_current = do_div(wf_current, devpriv->wf_period);
400 * Schedule timer to expire just after first conversion time.
401 * Seem to need an extra jiffy here, otherwise timer expires slightly
404 devpriv->ai_timer.expires =
405 jiffies + usecs_to_jiffies(devpriv->ai_convert_period) + 1;
406 add_timer(&devpriv->ai_timer);
410 static int waveform_ai_cancel(struct comedi_device *dev,
411 struct comedi_subdevice *s)
413 struct waveform_private *devpriv = dev->private;
416 /* Assume we were called from the timer routine itself. */
417 del_timer(&devpriv->ai_timer);
419 del_timer_sync(&devpriv->ai_timer);
424 static int waveform_ai_insn_read(struct comedi_device *dev,
425 struct comedi_subdevice *s,
426 struct comedi_insn *insn, unsigned int *data)
428 struct waveform_private *devpriv = dev->private;
429 int i, chan = CR_CHAN(insn->chanspec);
431 for (i = 0; i < insn->n; i++)
432 data[i] = devpriv->ao_loopbacks[chan];
438 * This is the background routine to handle AO commands, scheduled by
441 static void waveform_ao_timer(unsigned long arg)
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;
450 unsigned int scans_avail = 0;
452 /* determine number of scan periods since last time */
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);
459 /* determine scans in buffer, limit to scans to do this time */
460 scans_avail = comedi_nscans_left(s, 0);
461 if (scans_avail > scans_since)
462 scans_avail = scans_since;
464 /* skip all but the last scan to save processing time */
465 if (scans_avail > 1) {
466 unsigned int skip_bytes, nbytes;
469 comedi_samples_to_bytes(s, cmd->scan_end_arg *
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 /* unexpected underrun! (cancelled?) */
476 async->events |= COMEDI_CB_OVERFLOW;
480 /* output the last scan */
481 for (i = 0; i < cmd->scan_end_arg; i++) {
482 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
485 pd = &devpriv->ao_loopbacks[chan];
487 if (!comedi_buf_read_samples(s, pd, 1)) {
488 /* unexpected underrun! (cancelled?) */
489 async->events |= COMEDI_CB_OVERFLOW;
493 /* advance time of last scan */
494 devpriv->ao_last_scan_time +=
495 (u64)scans_avail * devpriv->ao_scan_period;
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;
503 unsigned int time_inc = devpriv->ao_last_scan_time +
504 devpriv->ao_scan_period - now;
506 mod_timer(&devpriv->ao_timer,
507 jiffies + usecs_to_jiffies(time_inc));
511 comedi_handle_events(dev, s);
514 static int waveform_ao_inttrig_start(struct comedi_device *dev,
515 struct comedi_subdevice *s,
516 unsigned int trig_num)
518 struct waveform_private *devpriv = dev->private;
519 struct comedi_async *async = s->async;
520 struct comedi_cmd *cmd = &async->cmd;
522 if (trig_num != cmd->start_arg)
525 async->inttrig = NULL;
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);
535 static int waveform_ao_cmdtest(struct comedi_device *dev,
536 struct comedi_subdevice *s,
537 struct comedi_cmd *cmd)
542 /* Step 1 : check if triggers are trivially valid */
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);
553 /* Step 2a : make sure trigger sources are unique */
555 err |= comedi_check_trigger_is_unique(cmd->stop_src);
557 /* Step 2b : and mutually compatible */
562 /* Step 3: check if arguments are trivially valid */
564 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
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,
570 if (cmd->stop_src == TRIG_COUNT)
571 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
572 else /* cmd->stop_src == TRIG_NONE */
573 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
578 /* step 4: fix up any arguments */
580 /* round scan_begin_arg to nearest microsecond */
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);
592 static int waveform_ao_cmd(struct comedi_device *dev,
593 struct comedi_subdevice *s)
595 struct waveform_private *devpriv = dev->private;
596 struct comedi_cmd *cmd = &s->async->cmd;
598 if (cmd->flags & CMDF_PRIORITY) {
599 dev_err(dev->class_dev,
600 "commands at RT priority not supported in this driver\n");
604 devpriv->ao_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC;
605 s->async->inttrig = waveform_ao_inttrig_start;
609 static int waveform_ao_cancel(struct comedi_device *dev,
610 struct comedi_subdevice *s)
612 struct waveform_private *devpriv = dev->private;
614 s->async->inttrig = NULL;
616 /* Assume we were called from the timer routine itself. */
617 del_timer(&devpriv->ao_timer);
619 del_timer_sync(&devpriv->ao_timer);
624 static int waveform_ao_insn_write(struct comedi_device *dev,
625 struct comedi_subdevice *s,
626 struct comedi_insn *insn, unsigned int *data)
628 struct waveform_private *devpriv = dev->private;
629 int i, chan = CR_CHAN(insn->chanspec);
631 for (i = 0; i < insn->n; i++)
632 devpriv->ao_loopbacks[chan] = data[i];
637 static int waveform_common_attach(struct comedi_device *dev,
638 int amplitude, int period)
640 struct waveform_private *devpriv;
641 struct comedi_subdevice *s;
645 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
649 devpriv->wf_amplitude = amplitude;
650 devpriv->wf_period = period;
652 ret = comedi_alloc_subdevices(dev, 2);
656 s = &dev->subdevices[0];
657 dev->read_subdev = s;
658 /* analog input subdevice */
659 s->type = COMEDI_SUBD_AI;
660 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
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;
670 s = &dev->subdevices[1];
671 dev->write_subdev = s;
672 /* analog output subdevice (loopback) */
673 s->type = COMEDI_SUBD_AO;
674 s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE;
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; /* do same as AI insn_read */
681 s->do_cmd = waveform_ao_cmd;
682 s->do_cmdtest = waveform_ao_cmdtest;
683 s->cancel = waveform_ao_cancel;
685 /* Our default loopback value is just a 0V flatline */
686 for (i = 0; i < s->n_chan; i++)
687 devpriv->ao_loopbacks[i] = s->maxdata / 2;
689 setup_timer(&devpriv->ai_timer, waveform_ai_timer, (unsigned long)dev);
690 setup_timer(&devpriv->ao_timer, waveform_ao_timer, (unsigned long)dev);
692 dev_info(dev->class_dev,
693 "%s: %u microvolt, %u microsecond waveform attached\n",
695 devpriv->wf_amplitude, devpriv->wf_period);
700 static int waveform_attach(struct comedi_device *dev,
701 struct comedi_devconfig *it)
703 int amplitude = it->options[0];
704 int period = it->options[1];
706 /* set default amplitude and period */
708 amplitude = 1000000; /* 1 volt */
710 period = 100000; /* 0.1 sec */
712 return waveform_common_attach(dev, amplitude, period);
715 static int waveform_auto_attach(struct comedi_device *dev,
716 unsigned long context_unused)
718 int amplitude = set_amplitude;
719 int period = set_period;
721 /* set default amplitude and period */
723 amplitude = 1000000; /* 1 volt */
725 period = 100000; /* 0.1 sec */
727 return waveform_common_attach(dev, amplitude, period);
730 static void waveform_detach(struct comedi_device *dev)
732 struct waveform_private *devpriv = dev->private;
735 del_timer_sync(&devpriv->ai_timer);
736 del_timer_sync(&devpriv->ao_timer);
740 static 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,
749 * For auto-configuration, a device is created to stand in for a
750 * real hardware device.
752 static int __init comedi_test_init(void)
756 ret = comedi_driver_register(&waveform_driver);
758 pr_err("comedi_test: unable to register driver\n");
763 ctcls = class_create(THIS_MODULE, CLASS_NAME);
765 pr_warn("comedi_test: unable to create class\n");
769 ctdev = device_create(ctcls, NULL, MKDEV(0, 0), NULL, DEV_NAME);
771 pr_warn("comedi_test: unable to create device\n");
775 ret = comedi_auto_config(ctdev, &waveform_driver, 0);
777 pr_warn("comedi_test: unable to auto-configure device\n");
785 device_destroy(ctcls, MKDEV(0, 0));
787 class_destroy(ctcls);
794 module_init(comedi_test_init);
796 static void __exit comedi_test_exit(void)
799 comedi_auto_unconfig(ctdev);
802 device_destroy(ctcls, MKDEV(0, 0));
803 class_destroy(ctcls);
806 comedi_driver_unregister(&waveform_driver);
808 module_exit(comedi_test_exit);
810 MODULE_AUTHOR("Comedi http://www.comedi.org");
811 MODULE_DESCRIPTION("Comedi low-level driver");
812 MODULE_LICENSE("GPL");