Commit | Line | Data |
---|---|---|
498460eb | 1 | /* |
cbad8cf4 IA |
2 | * comedi/drivers/comedi_test.c |
3 | * | |
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. | |
8 | * | |
9 | * Copyright (C) 2002 Joachim Wuttke <Joachim.Wuttke@icn.siemens.de> | |
10 | * Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net> | |
11 | * | |
12 | * COMEDI - Linux Control and Measurement Device Interface | |
13 | * Copyright (C) 2000 David A. Schleef <ds@schleef.org> | |
14 | * | |
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. | |
19 | * | |
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. | |
24 | */ | |
498460eb | 25 | |
498460eb | 26 | /* |
cbad8cf4 IA |
27 | * Driver: comedi_test |
28 | * Description: generates fake waveforms | |
29 | * Author: Joachim Wuttke <Joachim.Wuttke@icn.siemens.de>, Frank Mori Hess | |
30 | * <fmhess@users.sourceforge.net>, ds | |
31 | * Devices: | |
32 | * Status: works | |
33 | * Updated: Sat, 16 Mar 2002 17:34:48 -0800 | |
34 | * | |
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 | |
37 | * hardware. | |
38 | * | |
39 | * Configuration options: | |
40 | * [0] - Amplitude in microvolts for fake waveforms (default 1 volt) | |
41 | * [1] - Period in microseconds for fake waveforms (default 0.1 sec) | |
42 | * | |
43 | * Generates a sawtooth wave on channel 0, square wave on channel 1, additional | |
44 | * waveforms could be added to other channels (currently they return flatline | |
45 | * zero volts). | |
46 | */ | |
498460eb | 47 | |
ce157f80 | 48 | #include <linux/module.h> |
498460eb JW |
49 | #include "../comedidev.h" |
50 | ||
51 | #include <asm/div64.h> | |
52 | ||
de4545cd | 53 | #include <linux/timer.h> |
dd28153b | 54 | #include <linux/ktime.h> |
4e5ffbf2 | 55 | #include <linux/jiffies.h> |
498460eb | 56 | |
498460eb JW |
57 | #define N_CHANS 8 |
58 | ||
73e0e4df IA |
59 | enum waveform_state_bits { |
60 | WAVEFORM_AI_RUNNING = 0 | |
61 | }; | |
62 | ||
498460eb | 63 | /* Data unique to this driver */ |
8c49292f | 64 | struct waveform_private { |
807060a3 | 65 | struct timer_list ai_timer; /* timer for AI commands */ |
66d4da80 | 66 | u64 ai_last_scan_time; /* time of last AI scan in usec */ |
f3f24dff IA |
67 | unsigned int wf_amplitude; /* waveform amplitude in microvolts */ |
68 | unsigned int wf_period; /* waveform period in microseconds */ | |
69 | unsigned int wf_current; /* current time in waveform period */ | |
73e0e4df | 70 | unsigned long state_bits; |
807060a3 IA |
71 | unsigned int ai_scan_period; /* AI scan period in usec */ |
72 | unsigned int ai_convert_period; /* AI conversion period in usec */ | |
790c5541 | 73 | unsigned int ao_loopbacks[N_CHANS]; |
8c49292f | 74 | }; |
498460eb | 75 | |
1be0e3ed | 76 | /* fake analog input ranges */ |
9ced1de6 | 77 | static const struct comedi_lrange waveform_ai_ranges = { |
c7b51165 HS |
78 | 2, { |
79 | BIP_RANGE(10), | |
80 | BIP_RANGE(5) | |
81 | } | |
498460eb JW |
82 | }; |
83 | ||
8bd48c9e IA |
84 | static unsigned short fake_sawtooth(struct comedi_device *dev, |
85 | unsigned int range_index, | |
21ec1bf7 | 86 | unsigned int current_time) |
0eb0f278 | 87 | { |
f1e5aa75 | 88 | struct waveform_private *devpriv = dev->private; |
0eb0f278 HS |
89 | struct comedi_subdevice *s = dev->read_subdev; |
90 | unsigned int offset = s->maxdata / 2; | |
91 | u64 value; | |
92 | const struct comedi_krange *krange = | |
93 | &s->range_table->range[range_index]; | |
94 | u64 binary_amplitude; | |
95 | ||
96 | binary_amplitude = s->maxdata; | |
f3f24dff | 97 | binary_amplitude *= devpriv->wf_amplitude; |
0eb0f278 HS |
98 | do_div(binary_amplitude, krange->max - krange->min); |
99 | ||
0eb0f278 HS |
100 | value = current_time; |
101 | value *= binary_amplitude * 2; | |
f3f24dff | 102 | do_div(value, devpriv->wf_period); |
19e86985 IA |
103 | value += offset; |
104 | /* get rid of sawtooth's dc offset and clamp value */ | |
105 | if (value < binary_amplitude) { | |
106 | value = 0; /* negative saturation */ | |
107 | } else { | |
108 | value -= binary_amplitude; | |
109 | if (value > s->maxdata) | |
110 | value = s->maxdata; /* positive saturation */ | |
111 | } | |
0eb0f278 | 112 | |
19e86985 | 113 | return value; |
0eb0f278 HS |
114 | } |
115 | ||
8bd48c9e IA |
116 | static unsigned short fake_squarewave(struct comedi_device *dev, |
117 | unsigned int range_index, | |
21ec1bf7 | 118 | unsigned int current_time) |
0eb0f278 | 119 | { |
f1e5aa75 | 120 | struct waveform_private *devpriv = dev->private; |
0eb0f278 HS |
121 | struct comedi_subdevice *s = dev->read_subdev; |
122 | unsigned int offset = s->maxdata / 2; | |
123 | u64 value; | |
124 | const struct comedi_krange *krange = | |
125 | &s->range_table->range[range_index]; | |
0eb0f278 HS |
126 | |
127 | value = s->maxdata; | |
f3f24dff | 128 | value *= devpriv->wf_amplitude; |
0eb0f278 HS |
129 | do_div(value, krange->max - krange->min); |
130 | ||
19e86985 | 131 | /* get one of two values for square-wave and clamp */ |
f3f24dff | 132 | if (current_time < devpriv->wf_period / 2) { |
19e86985 IA |
133 | if (offset < value) |
134 | value = 0; /* negative saturation */ | |
135 | else | |
136 | value = offset - value; | |
137 | } else { | |
138 | value += offset; | |
139 | if (value > s->maxdata) | |
140 | value = s->maxdata; /* positive saturation */ | |
141 | } | |
0eb0f278 | 142 | |
19e86985 | 143 | return value; |
0eb0f278 HS |
144 | } |
145 | ||
8bd48c9e IA |
146 | static unsigned short fake_flatline(struct comedi_device *dev, |
147 | unsigned int range_index, | |
21ec1bf7 | 148 | unsigned int current_time) |
0eb0f278 HS |
149 | { |
150 | return dev->read_subdev->maxdata / 2; | |
151 | } | |
152 | ||
153 | /* generates a different waveform depending on what channel is read */ | |
8bd48c9e IA |
154 | static unsigned short fake_waveform(struct comedi_device *dev, |
155 | unsigned int channel, unsigned int range, | |
21ec1bf7 | 156 | unsigned int current_time) |
0eb0f278 HS |
157 | { |
158 | enum { | |
159 | SAWTOOTH_CHAN, | |
160 | SQUARE_CHAN, | |
161 | }; | |
162 | switch (channel) { | |
163 | case SAWTOOTH_CHAN: | |
164 | return fake_sawtooth(dev, range, current_time); | |
0eb0f278 HS |
165 | case SQUARE_CHAN: |
166 | return fake_squarewave(dev, range, current_time); | |
0eb0f278 HS |
167 | default: |
168 | break; | |
169 | } | |
170 | ||
171 | return fake_flatline(dev, range, current_time); | |
172 | } | |
173 | ||
498460eb | 174 | /* |
cbad8cf4 IA |
175 | * This is the background routine used to generate arbitrary data. |
176 | * It should run in the background; therefore it is scheduled by | |
177 | * a timer mechanism. | |
178 | */ | |
498460eb JW |
179 | static void waveform_ai_interrupt(unsigned long arg) |
180 | { | |
0a85b6f0 | 181 | struct comedi_device *dev = (struct comedi_device *)arg; |
f1e5aa75 | 182 | struct waveform_private *devpriv = dev->private; |
24051247 HS |
183 | struct comedi_subdevice *s = dev->read_subdev; |
184 | struct comedi_async *async = s->async; | |
ea6d0d4c | 185 | struct comedi_cmd *cmd = &async->cmd; |
498460eb | 186 | unsigned int i, j; |
498460eb JW |
187 | unsigned long elapsed_time; |
188 | unsigned int num_scans; | |
498460eb | 189 | |
73e0e4df IA |
190 | /* check command is still active */ |
191 | if (!test_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits)) | |
192 | return; | |
193 | ||
66d4da80 | 194 | elapsed_time = ktime_to_us(ktime_get()) - devpriv->ai_last_scan_time; |
807060a3 | 195 | num_scans = elapsed_time / devpriv->ai_scan_period; |
498460eb | 196 | |
f5345d45 | 197 | num_scans = comedi_nscans_left(s, num_scans); |
498460eb | 198 | for (i = 0; i < num_scans; i++) { |
807060a3 | 199 | unsigned int scan_remain_period = devpriv->ai_scan_period; |
8fa8a260 | 200 | |
498460eb | 201 | for (j = 0; j < cmd->chanlist_len; j++) { |
0642c94b | 202 | unsigned short sample; |
33bd00ef | 203 | |
f3f24dff IA |
204 | if (devpriv->wf_current >= devpriv->wf_period) |
205 | devpriv->wf_current %= devpriv->wf_period; | |
0642c94b IA |
206 | sample = fake_waveform(dev, CR_CHAN(cmd->chanlist[j]), |
207 | CR_RANGE(cmd->chanlist[j]), | |
f3f24dff | 208 | devpriv->wf_current); |
88f9662a | 209 | comedi_buf_write_samples(s, &sample, 1); |
f3f24dff | 210 | devpriv->wf_current += devpriv->ai_convert_period; |
807060a3 | 211 | scan_remain_period -= devpriv->ai_convert_period; |
498460eb | 212 | } |
f3f24dff | 213 | devpriv->wf_current += scan_remain_period; |
807060a3 | 214 | devpriv->ai_last_scan_time += devpriv->ai_scan_period; |
498460eb | 215 | } |
f3f24dff IA |
216 | if (devpriv->wf_current >= devpriv->wf_period) |
217 | devpriv->wf_current %= devpriv->wf_period; | |
498460eb | 218 | |
4e5ffbf2 | 219 | if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) { |
ea4f72b2 | 220 | async->events |= COMEDI_CB_EOA; |
4e5ffbf2 IA |
221 | } else { |
222 | mod_timer(&devpriv->ai_timer, | |
223 | jiffies + usecs_to_jiffies(devpriv->ai_scan_period)); | |
224 | } | |
498460eb | 225 | |
24051247 | 226 | comedi_handle_events(dev, s); |
498460eb JW |
227 | } |
228 | ||
0a85b6f0 MT |
229 | static int waveform_ai_cmdtest(struct comedi_device *dev, |
230 | struct comedi_subdevice *s, | |
ea6d0d4c | 231 | struct comedi_cmd *cmd) |
498460eb JW |
232 | { |
233 | int err = 0; | |
5afdcad2 | 234 | unsigned int arg, limit; |
498460eb | 235 | |
27020ffe | 236 | /* Step 1 : check if triggers are trivially valid */ |
498460eb | 237 | |
61f76970 | 238 | err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW); |
783ddaeb IA |
239 | err |= comedi_check_trigger_src(&cmd->scan_begin_src, |
240 | TRIG_FOLLOW | TRIG_TIMER); | |
61f76970 IA |
241 | err |= comedi_check_trigger_src(&cmd->convert_src, |
242 | TRIG_NOW | TRIG_TIMER); | |
243 | err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); | |
244 | err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); | |
498460eb JW |
245 | |
246 | if (err) | |
247 | return 1; | |
248 | ||
27020ffe | 249 | /* Step 2a : make sure trigger sources are unique */ |
498460eb | 250 | |
61f76970 IA |
251 | err |= comedi_check_trigger_is_unique(cmd->convert_src); |
252 | err |= comedi_check_trigger_is_unique(cmd->stop_src); | |
27020ffe HS |
253 | |
254 | /* Step 2b : and mutually compatible */ | |
498460eb | 255 | |
783ddaeb IA |
256 | if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW) |
257 | err |= -EINVAL; /* scan period would be 0 */ | |
258 | ||
498460eb JW |
259 | if (err) |
260 | return 2; | |
261 | ||
df5daff8 HS |
262 | /* Step 3: check if arguments are trivially valid */ |
263 | ||
61f76970 | 264 | err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); |
df5daff8 | 265 | |
783ddaeb | 266 | if (cmd->convert_src == TRIG_NOW) { |
61f76970 | 267 | err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0); |
783ddaeb IA |
268 | } else { /* cmd->convert_src == TRIG_TIMER */ |
269 | if (cmd->scan_begin_src == TRIG_FOLLOW) { | |
270 | err |= comedi_check_trigger_arg_min(&cmd->convert_arg, | |
271 | NSEC_PER_USEC); | |
272 | } | |
273 | } | |
498460eb | 274 | |
783ddaeb IA |
275 | if (cmd->scan_begin_src == TRIG_FOLLOW) { |
276 | err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); | |
277 | } else { /* cmd->scan_begin_src == TRIG_TIMER */ | |
278 | err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, | |
279 | NSEC_PER_USEC); | |
280 | } | |
498460eb | 281 | |
61f76970 IA |
282 | err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1); |
283 | err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, | |
284 | cmd->chanlist_len); | |
df5daff8 HS |
285 | |
286 | if (cmd->stop_src == TRIG_COUNT) | |
61f76970 | 287 | err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); |
783ddaeb | 288 | else /* cmd->stop_src == TRIG_NONE */ |
61f76970 | 289 | err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); |
498460eb JW |
290 | |
291 | if (err) | |
292 | return 3; | |
293 | ||
294 | /* step 4: fix up any arguments */ | |
295 | ||
498460eb | 296 | if (cmd->convert_src == TRIG_TIMER) { |
5afdcad2 | 297 | /* round convert_arg to nearest microsecond */ |
b2ef4813 | 298 | arg = cmd->convert_arg; |
5afdcad2 IA |
299 | arg = min(arg, |
300 | rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); | |
301 | arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); | |
783ddaeb IA |
302 | if (cmd->scan_begin_arg == TRIG_TIMER) { |
303 | /* limit convert_arg to keep scan_begin_arg in range */ | |
304 | limit = UINT_MAX / cmd->scan_end_arg; | |
305 | limit = rounddown(limit, (unsigned int)NSEC_PER_SEC); | |
306 | arg = min(arg, limit); | |
307 | } | |
61f76970 | 308 | err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg); |
498460eb JW |
309 | } |
310 | ||
783ddaeb IA |
311 | if (cmd->scan_begin_src == TRIG_TIMER) { |
312 | /* round scan_begin_arg to nearest microsecond */ | |
313 | arg = cmd->scan_begin_arg; | |
314 | arg = min(arg, | |
315 | rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); | |
316 | arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); | |
317 | if (cmd->convert_src == TRIG_TIMER) { | |
318 | /* but ensure scan_begin_arg is large enough */ | |
319 | arg = max(arg, cmd->convert_arg * cmd->scan_end_arg); | |
320 | } | |
321 | err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); | |
5afdcad2 | 322 | } |
5afdcad2 | 323 | |
498460eb JW |
324 | if (err) |
325 | return 4; | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
0a85b6f0 MT |
330 | static int waveform_ai_cmd(struct comedi_device *dev, |
331 | struct comedi_subdevice *s) | |
498460eb | 332 | { |
f1e5aa75 | 333 | struct waveform_private *devpriv = dev->private; |
ea6d0d4c | 334 | struct comedi_cmd *cmd = &s->async->cmd; |
f3f24dff | 335 | u64 wf_current; |
498460eb | 336 | |
51d66b29 | 337 | if (cmd->flags & CMDF_PRIORITY) { |
b8de3cc4 HS |
338 | dev_err(dev->class_dev, |
339 | "commands at RT priority not supported in this driver\n"); | |
498460eb JW |
340 | return -1; |
341 | } | |
342 | ||
498460eb | 343 | if (cmd->convert_src == TRIG_NOW) |
807060a3 | 344 | devpriv->ai_convert_period = 0; |
783ddaeb | 345 | else /* cmd->convert_src == TRIG_TIMER */ |
807060a3 | 346 | devpriv->ai_convert_period = cmd->convert_arg / NSEC_PER_USEC; |
498460eb | 347 | |
783ddaeb | 348 | if (cmd->scan_begin_src == TRIG_FOLLOW) { |
807060a3 IA |
349 | devpriv->ai_scan_period = devpriv->ai_convert_period * |
350 | cmd->scan_end_arg; | |
783ddaeb | 351 | } else { /* cmd->scan_begin_src == TRIG_TIMER */ |
807060a3 | 352 | devpriv->ai_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC; |
783ddaeb IA |
353 | } |
354 | ||
66d4da80 IA |
355 | devpriv->ai_last_scan_time = ktime_to_us(ktime_get()); |
356 | /* Determine time within waveform period. */ | |
f3f24dff IA |
357 | wf_current = devpriv->ai_last_scan_time; |
358 | devpriv->wf_current = do_div(wf_current, devpriv->wf_period); | |
498460eb | 359 | |
4e5ffbf2 IA |
360 | devpriv->ai_timer.expires = |
361 | jiffies + usecs_to_jiffies(devpriv->ai_scan_period); | |
362 | ||
73e0e4df IA |
363 | /* mark command as active */ |
364 | smp_mb__before_atomic(); | |
365 | set_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits); | |
366 | smp_mb__after_atomic(); | |
807060a3 | 367 | add_timer(&devpriv->ai_timer); |
498460eb JW |
368 | return 0; |
369 | } | |
370 | ||
0a85b6f0 MT |
371 | static int waveform_ai_cancel(struct comedi_device *dev, |
372 | struct comedi_subdevice *s) | |
498460eb | 373 | { |
f1e5aa75 HS |
374 | struct waveform_private *devpriv = dev->private; |
375 | ||
73e0e4df IA |
376 | /* mark command as no longer active */ |
377 | clear_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits); | |
378 | smp_mb__after_atomic(); | |
379 | /* cannot call del_timer_sync() as may be called from timer routine */ | |
807060a3 | 380 | del_timer(&devpriv->ai_timer); |
498460eb JW |
381 | return 0; |
382 | } | |
383 | ||
0a85b6f0 MT |
384 | static int waveform_ai_insn_read(struct comedi_device *dev, |
385 | struct comedi_subdevice *s, | |
90035c08 | 386 | struct comedi_insn *insn, unsigned int *data) |
498460eb | 387 | { |
f1e5aa75 | 388 | struct waveform_private *devpriv = dev->private; |
498460eb JW |
389 | int i, chan = CR_CHAN(insn->chanspec); |
390 | ||
391 | for (i = 0; i < insn->n; i++) | |
392 | data[i] = devpriv->ao_loopbacks[chan]; | |
393 | ||
394 | return insn->n; | |
395 | } | |
396 | ||
0a85b6f0 MT |
397 | static int waveform_ao_insn_write(struct comedi_device *dev, |
398 | struct comedi_subdevice *s, | |
90035c08 | 399 | struct comedi_insn *insn, unsigned int *data) |
498460eb | 400 | { |
f1e5aa75 | 401 | struct waveform_private *devpriv = dev->private; |
498460eb JW |
402 | int i, chan = CR_CHAN(insn->chanspec); |
403 | ||
404 | for (i = 0; i < insn->n; i++) | |
405 | devpriv->ao_loopbacks[chan] = data[i]; | |
406 | ||
407 | return insn->n; | |
408 | } | |
90f703d3 | 409 | |
0eb0f278 HS |
410 | static int waveform_attach(struct comedi_device *dev, |
411 | struct comedi_devconfig *it) | |
412 | { | |
f1e5aa75 | 413 | struct waveform_private *devpriv; |
0eb0f278 HS |
414 | struct comedi_subdevice *s; |
415 | int amplitude = it->options[0]; | |
416 | int period = it->options[1]; | |
417 | int i; | |
8b6c5694 | 418 | int ret; |
0eb0f278 | 419 | |
0bdab509 | 420 | devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); |
c34fa261 HS |
421 | if (!devpriv) |
422 | return -ENOMEM; | |
0eb0f278 HS |
423 | |
424 | /* set default amplitude and period */ | |
425 | if (amplitude <= 0) | |
426 | amplitude = 1000000; /* 1 volt */ | |
427 | if (period <= 0) | |
428 | period = 100000; /* 0.1 sec */ | |
429 | ||
f3f24dff IA |
430 | devpriv->wf_amplitude = amplitude; |
431 | devpriv->wf_period = period; | |
0eb0f278 | 432 | |
8b6c5694 HS |
433 | ret = comedi_alloc_subdevices(dev, 2); |
434 | if (ret) | |
435 | return ret; | |
0eb0f278 | 436 | |
713e5c35 | 437 | s = &dev->subdevices[0]; |
0eb0f278 HS |
438 | dev->read_subdev = s; |
439 | /* analog input subdevice */ | |
440 | s->type = COMEDI_SUBD_AI; | |
441 | s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ; | |
b1da4943 HS |
442 | s->n_chan = N_CHANS; |
443 | s->maxdata = 0xffff; | |
0eb0f278 HS |
444 | s->range_table = &waveform_ai_ranges; |
445 | s->len_chanlist = s->n_chan * 2; | |
446 | s->insn_read = waveform_ai_insn_read; | |
447 | s->do_cmd = waveform_ai_cmd; | |
448 | s->do_cmdtest = waveform_ai_cmdtest; | |
449 | s->cancel = waveform_ai_cancel; | |
450 | ||
713e5c35 | 451 | s = &dev->subdevices[1]; |
0eb0f278 HS |
452 | dev->write_subdev = s; |
453 | /* analog output subdevice (loopback) */ | |
454 | s->type = COMEDI_SUBD_AO; | |
ef49d832 | 455 | s->subdev_flags = SDF_WRITABLE | SDF_GROUND; |
b1da4943 HS |
456 | s->n_chan = N_CHANS; |
457 | s->maxdata = 0xffff; | |
0eb0f278 | 458 | s->range_table = &waveform_ai_ranges; |
0eb0f278 | 459 | s->insn_write = waveform_ao_insn_write; |
0eb0f278 HS |
460 | |
461 | /* Our default loopback value is just a 0V flatline */ | |
462 | for (i = 0; i < s->n_chan; i++) | |
463 | devpriv->ao_loopbacks[i] = s->maxdata / 2; | |
464 | ||
807060a3 | 465 | setup_timer(&devpriv->ai_timer, waveform_ai_interrupt, |
9a9bdd68 | 466 | (unsigned long)dev); |
0eb0f278 | 467 | |
9ac6eb40 | 468 | dev_info(dev->class_dev, |
21ec1bf7 | 469 | "%s: %u microvolt, %u microsecond waveform attached\n", |
9254c841 | 470 | dev->board_name, |
f3f24dff | 471 | devpriv->wf_amplitude, devpriv->wf_period); |
9ac6eb40 HS |
472 | |
473 | return 0; | |
0eb0f278 HS |
474 | } |
475 | ||
484ecc95 | 476 | static void waveform_detach(struct comedi_device *dev) |
0eb0f278 | 477 | { |
f1e5aa75 HS |
478 | struct waveform_private *devpriv = dev->private; |
479 | ||
480 | if (devpriv) | |
807060a3 | 481 | del_timer_sync(&devpriv->ai_timer); |
0eb0f278 HS |
482 | } |
483 | ||
0eb0f278 HS |
484 | static struct comedi_driver waveform_driver = { |
485 | .driver_name = "comedi_test", | |
486 | .module = THIS_MODULE, | |
487 | .attach = waveform_attach, | |
488 | .detach = waveform_detach, | |
0eb0f278 HS |
489 | }; |
490 | module_comedi_driver(waveform_driver); | |
491 | ||
90f703d3 AT |
492 | MODULE_AUTHOR("Comedi http://www.comedi.org"); |
493 | MODULE_DESCRIPTION("Comedi low-level driver"); | |
494 | MODULE_LICENSE("GPL"); |