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Commit | Line | Data |
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ed9eccbe DS |
1 | /* |
2 | comedi/comedi_fops.c | |
3 | comedi kernel module | |
4 | ||
5 | COMEDI - Linux Control and Measurement Device Interface | |
6 | Copyright (C) 1997-2000 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 | #undef DEBUG | |
25 | ||
ed9eccbe DS |
26 | #include "comedi_compat32.h" |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/fcntl.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/kmod.h> | |
38 | #include <linux/poll.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/device.h> | |
41 | #include <linux/vmalloc.h> | |
42 | #include <linux/fs.h> | |
43 | #include "comedidev.h" | |
44 | #include <linux/cdev.h> | |
883db3d9 | 45 | #include <linux/stat.h> |
ed9eccbe | 46 | |
476b8477 GKH |
47 | #include <linux/io.h> |
48 | #include <linux/uaccess.h> | |
ed9eccbe | 49 | |
3a5fa275 | 50 | #include "comedi_internal.h" |
ed9eccbe | 51 | |
ed9eccbe DS |
52 | #ifdef CONFIG_COMEDI_DEBUG |
53 | int comedi_debug; | |
18736438 | 54 | EXPORT_SYMBOL(comedi_debug); |
4d7df821 IA |
55 | module_param(comedi_debug, int, S_IRUGO | S_IWUSR); |
56 | MODULE_PARM_DESC(comedi_debug, | |
57 | "enable comedi core and driver debugging if non-zero (default 0)" | |
58 | ); | |
ed9eccbe DS |
59 | #endif |
60 | ||
90ab5ee9 | 61 | bool comedi_autoconfig = 1; |
4d7df821 IA |
62 | module_param(comedi_autoconfig, bool, S_IRUGO); |
63 | MODULE_PARM_DESC(comedi_autoconfig, | |
64 | "enable drivers to auto-configure comedi devices (default 1)"); | |
6a9d7a21 | 65 | |
92d0127c | 66 | static int comedi_num_legacy_minors; |
4d7df821 IA |
67 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
68 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
69 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
70 | ); | |
71 | ||
234bb3c6 | 72 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
73 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
74 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
75 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 76 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 77 | |
234bb3c6 IA |
78 | unsigned int comedi_default_buf_maxsize_kb |
79 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
80 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
81 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
82 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 83 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 84 | |
cd6b7636 | 85 | struct comedi_file_info { |
e79c8d21 HS |
86 | struct comedi_device *device; |
87 | struct comedi_subdevice *read_subdevice; | |
88 | struct comedi_subdevice *write_subdevice; | |
89 | struct device *hardware_device; | |
90 | }; | |
91 | ||
ed9eccbe | 92 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
cd6b7636 | 93 | static struct comedi_file_info *comedi_file_info_table[COMEDI_NUM_MINORS]; |
476b8477 | 94 | |
ed69335c | 95 | static struct comedi_file_info *comedi_file_info_from_minor(unsigned minor) |
87b1ad7a | 96 | { |
cd6b7636 | 97 | struct comedi_file_info *info; |
87b1ad7a HS |
98 | |
99 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
100 | spin_lock(&comedi_file_info_table_lock); | |
101 | info = comedi_file_info_table[minor]; | |
102 | spin_unlock(&comedi_file_info_table_lock); | |
103 | return info; | |
104 | } | |
105 | ||
ba1bcf6f IA |
106 | static struct comedi_device * |
107 | comedi_dev_from_file_info(struct comedi_file_info *info) | |
85104e9b | 108 | { |
85104e9b HS |
109 | return info ? info->device : NULL; |
110 | } | |
ba1bcf6f IA |
111 | |
112 | struct comedi_device *comedi_dev_from_minor(unsigned minor) | |
113 | { | |
114 | return comedi_dev_from_file_info(comedi_file_info_from_minor(minor)); | |
115 | } | |
85104e9b HS |
116 | EXPORT_SYMBOL_GPL(comedi_dev_from_minor); |
117 | ||
43bd33f2 | 118 | static struct comedi_subdevice * |
7d8a2567 | 119 | comedi_read_subdevice(const struct comedi_file_info *info) |
43bd33f2 HS |
120 | { |
121 | if (info->read_subdevice) | |
122 | return info->read_subdevice; | |
401d99de HS |
123 | if (info->device) |
124 | return info->device->read_subdev; | |
125 | return NULL; | |
43bd33f2 HS |
126 | } |
127 | ||
128 | static struct comedi_subdevice * | |
7d8a2567 | 129 | comedi_write_subdevice(const struct comedi_file_info *info) |
43bd33f2 HS |
130 | { |
131 | if (info->write_subdevice) | |
132 | return info->write_subdevice; | |
401d99de HS |
133 | if (info->device) |
134 | return info->device->write_subdev; | |
135 | return NULL; | |
43bd33f2 HS |
136 | } |
137 | ||
883db3d9 FMH |
138 | static int resize_async_buffer(struct comedi_device *dev, |
139 | struct comedi_subdevice *s, | |
a5011a26 HS |
140 | struct comedi_async *async, unsigned new_size) |
141 | { | |
142 | int retval; | |
143 | ||
144 | if (new_size > async->max_bufsize) | |
145 | return -EPERM; | |
146 | ||
147 | if (s->busy) { | |
148 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
149 | return -EBUSY; | |
150 | } | |
151 | if (async->mmap_count) { | |
152 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
153 | return -EBUSY; | |
154 | } | |
155 | ||
156 | if (!async->prealloc_buf) | |
157 | return -EINVAL; | |
158 | ||
159 | /* make sure buffer is an integral number of pages | |
160 | * (we round up) */ | |
161 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
162 | ||
163 | retval = comedi_buf_alloc(dev, s, new_size); | |
164 | if (retval < 0) | |
165 | return retval; | |
166 | ||
167 | if (s->buf_change) { | |
168 | retval = s->buf_change(dev, s, new_size); | |
169 | if (retval < 0) | |
170 | return retval; | |
171 | } | |
172 | ||
173 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
90a35c15 | 174 | dev->minor, s->index, async->prealloc_bufsz); |
a5011a26 HS |
175 | return 0; |
176 | } | |
177 | ||
178 | /* sysfs attribute files */ | |
179 | ||
a5011a26 HS |
180 | static ssize_t show_max_read_buffer_kb(struct device *dev, |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
cd6b7636 | 183 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 184 | struct comedi_subdevice *s = comedi_read_subdevice(info); |
72fd9fac | 185 | unsigned int size = 0; |
a5011a26 HS |
186 | |
187 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
188 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
189 | size = s->async->max_bufsize / 1024; | |
a5011a26 HS |
190 | mutex_unlock(&info->device->mutex); |
191 | ||
72fd9fac | 192 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
193 | } |
194 | ||
195 | static ssize_t store_max_read_buffer_kb(struct device *dev, | |
196 | struct device_attribute *attr, | |
197 | const char *buf, size_t count) | |
198 | { | |
cd6b7636 | 199 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 200 | struct comedi_subdevice *s = comedi_read_subdevice(info); |
72fd9fac HS |
201 | unsigned int size; |
202 | int err; | |
203 | ||
204 | err = kstrtouint(buf, 10, &size); | |
205 | if (err) | |
206 | return err; | |
207 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 208 | return -EINVAL; |
72fd9fac | 209 | size *= 1024; |
a5011a26 HS |
210 | |
211 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
212 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
213 | s->async->max_bufsize = size; | |
214 | else | |
215 | err = -EINVAL; | |
a5011a26 HS |
216 | mutex_unlock(&info->device->mutex); |
217 | ||
72fd9fac | 218 | return err ? err : count; |
a5011a26 HS |
219 | } |
220 | ||
a5011a26 HS |
221 | static ssize_t show_read_buffer_kb(struct device *dev, |
222 | struct device_attribute *attr, char *buf) | |
223 | { | |
cd6b7636 | 224 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 225 | struct comedi_subdevice *s = comedi_read_subdevice(info); |
72fd9fac | 226 | unsigned int size = 0; |
a5011a26 HS |
227 | |
228 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
229 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
230 | size = s->async->prealloc_bufsz / 1024; | |
a5011a26 HS |
231 | mutex_unlock(&info->device->mutex); |
232 | ||
72fd9fac | 233 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
234 | } |
235 | ||
236 | static ssize_t store_read_buffer_kb(struct device *dev, | |
237 | struct device_attribute *attr, | |
238 | const char *buf, size_t count) | |
239 | { | |
cd6b7636 | 240 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 241 | struct comedi_subdevice *s = comedi_read_subdevice(info); |
72fd9fac HS |
242 | unsigned int size; |
243 | int err; | |
244 | ||
245 | err = kstrtouint(buf, 10, &size); | |
246 | if (err) | |
247 | return err; | |
248 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 249 | return -EINVAL; |
72fd9fac | 250 | size *= 1024; |
a5011a26 HS |
251 | |
252 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
253 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
254 | err = resize_async_buffer(info->device, s, s->async, size); | |
255 | else | |
256 | err = -EINVAL; | |
a5011a26 HS |
257 | mutex_unlock(&info->device->mutex); |
258 | ||
72fd9fac | 259 | return err ? err : count; |
a5011a26 | 260 | } |
883db3d9 | 261 | |
a5011a26 HS |
262 | static ssize_t show_max_write_buffer_kb(struct device *dev, |
263 | struct device_attribute *attr, | |
264 | char *buf) | |
265 | { | |
cd6b7636 | 266 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 267 | struct comedi_subdevice *s = comedi_write_subdevice(info); |
72fd9fac | 268 | unsigned int size = 0; |
a5011a26 HS |
269 | |
270 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
271 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
272 | size = s->async->max_bufsize / 1024; | |
a5011a26 HS |
273 | mutex_unlock(&info->device->mutex); |
274 | ||
72fd9fac | 275 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
276 | } |
277 | ||
278 | static ssize_t store_max_write_buffer_kb(struct device *dev, | |
279 | struct device_attribute *attr, | |
280 | const char *buf, size_t count) | |
281 | { | |
cd6b7636 | 282 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 283 | struct comedi_subdevice *s = comedi_write_subdevice(info); |
72fd9fac HS |
284 | unsigned int size; |
285 | int err; | |
286 | ||
287 | err = kstrtouint(buf, 10, &size); | |
288 | if (err) | |
289 | return err; | |
290 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 291 | return -EINVAL; |
72fd9fac | 292 | size *= 1024; |
a5011a26 HS |
293 | |
294 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
295 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
296 | s->async->max_bufsize = size; | |
297 | else | |
298 | err = -EINVAL; | |
a5011a26 HS |
299 | mutex_unlock(&info->device->mutex); |
300 | ||
72fd9fac | 301 | return err ? err : count; |
a5011a26 HS |
302 | } |
303 | ||
a5011a26 HS |
304 | static ssize_t show_write_buffer_kb(struct device *dev, |
305 | struct device_attribute *attr, char *buf) | |
306 | { | |
cd6b7636 | 307 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 308 | struct comedi_subdevice *s = comedi_write_subdevice(info); |
72fd9fac | 309 | unsigned int size = 0; |
a5011a26 HS |
310 | |
311 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
312 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
313 | size = s->async->prealloc_bufsz / 1024; | |
a5011a26 HS |
314 | mutex_unlock(&info->device->mutex); |
315 | ||
72fd9fac | 316 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
317 | } |
318 | ||
319 | static ssize_t store_write_buffer_kb(struct device *dev, | |
320 | struct device_attribute *attr, | |
321 | const char *buf, size_t count) | |
322 | { | |
cd6b7636 | 323 | struct comedi_file_info *info = dev_get_drvdata(dev); |
7d8a2567 | 324 | struct comedi_subdevice *s = comedi_write_subdevice(info); |
72fd9fac HS |
325 | unsigned int size; |
326 | int err; | |
327 | ||
328 | err = kstrtouint(buf, 10, &size); | |
329 | if (err) | |
330 | return err; | |
331 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 332 | return -EINVAL; |
72fd9fac | 333 | size *= 1024; |
a5011a26 HS |
334 | |
335 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
336 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
337 | err = resize_async_buffer(info->device, s, s->async, size); | |
338 | else | |
339 | err = -EINVAL; | |
a5011a26 HS |
340 | mutex_unlock(&info->device->mutex); |
341 | ||
72fd9fac | 342 | return err ? err : count; |
a5011a26 HS |
343 | } |
344 | ||
fb60367d HS |
345 | static struct device_attribute comedi_dev_attrs[] = { |
346 | __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, | |
347 | show_max_read_buffer_kb, store_max_read_buffer_kb), | |
348 | __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
349 | show_read_buffer_kb, store_read_buffer_kb), | |
350 | __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, | |
351 | show_max_write_buffer_kb, store_max_write_buffer_kb), | |
352 | __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
353 | show_write_buffer_kb, store_write_buffer_kb), | |
354 | __ATTR_NULL | |
a5011a26 | 355 | }; |
ed9eccbe | 356 | |
2aae0076 HS |
357 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
358 | unsigned mask, unsigned bits) | |
359 | { | |
360 | unsigned long flags; | |
361 | ||
362 | spin_lock_irqsave(&s->spin_lock, flags); | |
363 | s->runflags &= ~mask; | |
364 | s->runflags |= (bits & mask); | |
365 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
366 | } | |
367 | ||
ade1764f | 368 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
369 | { |
370 | unsigned long flags; | |
371 | unsigned runflags; | |
372 | ||
373 | spin_lock_irqsave(&s->spin_lock, flags); | |
374 | runflags = s->runflags; | |
375 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
376 | return runflags; | |
377 | } | |
74120719 | 378 | |
e0dac318 HS |
379 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
380 | { | |
381 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
382 | ||
383 | return (runflags & SRF_RUNNING) ? true : false; | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
386 | ||
c098c21a HS |
387 | static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) |
388 | { | |
389 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
390 | ||
391 | return (runflags & SRF_ERROR) ? true : false; | |
392 | } | |
393 | ||
9682e28c HS |
394 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
395 | { | |
396 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
397 | ||
398 | return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true; | |
399 | } | |
400 | ||
2aae0076 HS |
401 | /* |
402 | This function restores a subdevice to an idle state. | |
403 | */ | |
404 | static void do_become_nonbusy(struct comedi_device *dev, | |
405 | struct comedi_subdevice *s) | |
406 | { | |
407 | struct comedi_async *async = s->async; | |
408 | ||
409 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
410 | if (async) { | |
411 | comedi_reset_async_buf(async); | |
412 | async->inttrig = NULL; | |
413 | kfree(async->cmd.chanlist); | |
414 | async->cmd.chanlist = NULL; | |
415 | } else { | |
416 | dev_err(dev->class_dev, | |
417 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
418 | } | |
419 | ||
420 | s->busy = NULL; | |
421 | } | |
422 | ||
423 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
424 | { | |
425 | int ret = 0; | |
426 | ||
f0124630 | 427 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
428 | ret = s->cancel(dev, s); |
429 | ||
430 | do_become_nonbusy(dev, s); | |
431 | ||
432 | return ret; | |
433 | } | |
434 | ||
435 | static int is_device_busy(struct comedi_device *dev) | |
436 | { | |
437 | struct comedi_subdevice *s; | |
438 | int i; | |
439 | ||
440 | if (!dev->attached) | |
441 | return 0; | |
442 | ||
443 | for (i = 0; i < dev->n_subdevices; i++) { | |
444 | s = &dev->subdevices[i]; | |
445 | if (s->busy) | |
446 | return 1; | |
447 | if (s->async && s->async->mmap_count) | |
448 | return 1; | |
449 | } | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
ed9eccbe DS |
454 | /* |
455 | COMEDI_DEVCONFIG | |
456 | device config ioctl | |
457 | ||
458 | arg: | |
459 | pointer to devconfig structure | |
460 | ||
461 | reads: | |
462 | devconfig structure at arg | |
463 | ||
464 | writes: | |
465 | none | |
466 | */ | |
0a85b6f0 | 467 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 468 | struct comedi_devconfig __user *arg) |
ed9eccbe | 469 | { |
0707bb04 | 470 | struct comedi_devconfig it; |
ed9eccbe DS |
471 | int ret; |
472 | unsigned char *aux_data = NULL; | |
473 | int aux_len; | |
474 | ||
475 | if (!capable(CAP_SYS_ADMIN)) | |
476 | return -EPERM; | |
477 | ||
478 | if (arg == NULL) { | |
479 | if (is_device_busy(dev)) | |
480 | return -EBUSY; | |
476b8477 | 481 | if (dev->attached) { |
ed9eccbe DS |
482 | struct module *driver_module = dev->driver->module; |
483 | comedi_device_detach(dev); | |
484 | module_put(driver_module); | |
485 | } | |
486 | return 0; | |
487 | } | |
488 | ||
bc252fd1 | 489 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
490 | return -EFAULT; |
491 | ||
492 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
493 | ||
494 | if (comedi_aux_data(it.options, 0) && | |
476b8477 | 495 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
ed9eccbe DS |
496 | int bit_shift; |
497 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; | |
498 | if (aux_len < 0) | |
499 | return -EFAULT; | |
500 | ||
501 | aux_data = vmalloc(aux_len); | |
502 | if (!aux_data) | |
503 | return -ENOMEM; | |
504 | ||
505 | if (copy_from_user(aux_data, | |
dc881f29 IA |
506 | (unsigned char __user * |
507 | )comedi_aux_data(it.options, 0), aux_len)) { | |
ed9eccbe DS |
508 | vfree(aux_data); |
509 | return -EFAULT; | |
510 | } | |
511 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = | |
476b8477 | 512 | (unsigned long)aux_data; |
ed9eccbe DS |
513 | if (sizeof(void *) > sizeof(int)) { |
514 | bit_shift = sizeof(int) * 8; | |
515 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = | |
476b8477 | 516 | ((unsigned long)aux_data) >> bit_shift; |
ed9eccbe DS |
517 | } else |
518 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; | |
519 | } | |
520 | ||
521 | ret = comedi_device_attach(dev, &it); | |
476b8477 GKH |
522 | if (ret == 0) { |
523 | if (!try_module_get(dev->driver->module)) { | |
ed9eccbe | 524 | comedi_device_detach(dev); |
abae41e6 | 525 | ret = -ENOSYS; |
ed9eccbe DS |
526 | } |
527 | } | |
528 | ||
529 | if (aux_data) | |
530 | vfree(aux_data); | |
531 | ||
532 | return ret; | |
533 | } | |
534 | ||
535 | /* | |
536 | COMEDI_BUFCONFIG | |
537 | buffer configuration ioctl | |
538 | ||
539 | arg: | |
540 | pointer to bufconfig structure | |
541 | ||
542 | reads: | |
543 | bufconfig at arg | |
544 | ||
545 | writes: | |
546 | modified bufconfig at arg | |
547 | ||
548 | */ | |
92d0127c GKH |
549 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
550 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 551 | { |
be6aba4a | 552 | struct comedi_bufconfig bc; |
d163679c | 553 | struct comedi_async *async; |
34c43922 | 554 | struct comedi_subdevice *s; |
883db3d9 | 555 | int retval = 0; |
ed9eccbe | 556 | |
bc252fd1 | 557 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
558 | return -EFAULT; |
559 | ||
560 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
561 | return -EINVAL; | |
562 | ||
b077f2cd | 563 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
564 | async = s->async; |
565 | ||
566 | if (!async) { | |
567 | DPRINTK("subdevice does not have async capability\n"); | |
568 | bc.size = 0; | |
569 | bc.maximum_size = 0; | |
570 | goto copyback; | |
571 | } | |
572 | ||
573 | if (bc.maximum_size) { | |
574 | if (!capable(CAP_SYS_ADMIN)) | |
575 | return -EPERM; | |
576 | ||
577 | async->max_bufsize = bc.maximum_size; | |
578 | } | |
579 | ||
580 | if (bc.size) { | |
883db3d9 FMH |
581 | retval = resize_async_buffer(dev, s, async, bc.size); |
582 | if (retval < 0) | |
583 | return retval; | |
ed9eccbe DS |
584 | } |
585 | ||
586 | bc.size = async->prealloc_bufsz; | |
587 | bc.maximum_size = async->max_bufsize; | |
588 | ||
476b8477 | 589 | copyback: |
bc252fd1 | 590 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
591 | return -EFAULT; |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | /* | |
597 | COMEDI_DEVINFO | |
598 | device info ioctl | |
599 | ||
600 | arg: | |
601 | pointer to devinfo structure | |
602 | ||
603 | reads: | |
604 | none | |
605 | ||
606 | writes: | |
607 | devinfo structure | |
608 | ||
609 | */ | |
0a85b6f0 | 610 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
611 | struct comedi_devinfo __user *arg, |
612 | struct file *file) | |
ed9eccbe | 613 | { |
ed9eccbe | 614 | const unsigned minor = iminor(file->f_dentry->d_inode); |
ed69335c | 615 | struct comedi_file_info *info = comedi_file_info_from_minor(minor); |
0e700923 HS |
616 | struct comedi_subdevice *s; |
617 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
618 | |
619 | memset(&devinfo, 0, sizeof(devinfo)); | |
620 | ||
621 | /* fill devinfo structure */ | |
622 | devinfo.version_code = COMEDI_VERSION_CODE; | |
623 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
624 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
625 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 626 | |
0e700923 HS |
627 | s = comedi_read_subdevice(info); |
628 | if (s) | |
90a35c15 | 629 | devinfo.read_subdevice = s->index; |
476b8477 | 630 | else |
ed9eccbe | 631 | devinfo.read_subdevice = -1; |
476b8477 | 632 | |
0e700923 HS |
633 | s = comedi_write_subdevice(info); |
634 | if (s) | |
90a35c15 | 635 | devinfo.write_subdevice = s->index; |
476b8477 | 636 | else |
ed9eccbe | 637 | devinfo.write_subdevice = -1; |
ed9eccbe | 638 | |
bc252fd1 | 639 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
640 | return -EFAULT; |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | /* | |
646 | COMEDI_SUBDINFO | |
647 | subdevice info ioctl | |
648 | ||
649 | arg: | |
650 | pointer to array of subdevice info structures | |
651 | ||
652 | reads: | |
653 | none | |
654 | ||
655 | writes: | |
656 | array of subdevice info structures at arg | |
657 | ||
658 | */ | |
0a85b6f0 | 659 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 660 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
661 | { |
662 | int ret, i; | |
bd52efbb | 663 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 664 | struct comedi_subdevice *s; |
ed9eccbe | 665 | |
bc252fd1 | 666 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
667 | if (!tmp) |
668 | return -ENOMEM; | |
669 | ||
670 | /* fill subdinfo structs */ | |
671 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 672 | s = &dev->subdevices[i]; |
ed9eccbe DS |
673 | us = tmp + i; |
674 | ||
675 | us->type = s->type; | |
676 | us->n_chan = s->n_chan; | |
677 | us->subd_flags = s->subdev_flags; | |
f0124630 | 678 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
679 | us->subd_flags |= SDF_RUNNING; |
680 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
681 | us->timer_type = TIMER_nanosec; | |
682 | us->len_chanlist = s->len_chanlist; | |
683 | us->maxdata = s->maxdata; | |
684 | if (s->range_table) { | |
685 | us->range_type = | |
476b8477 | 686 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
687 | } else { |
688 | us->range_type = 0; /* XXX */ | |
689 | } | |
690 | us->flags = s->flags; | |
691 | ||
692 | if (s->busy) | |
693 | us->subd_flags |= SDF_BUSY; | |
694 | if (s->busy == file) | |
695 | us->subd_flags |= SDF_BUSY_OWNER; | |
696 | if (s->lock) | |
697 | us->subd_flags |= SDF_LOCKED; | |
698 | if (s->lock == file) | |
699 | us->subd_flags |= SDF_LOCK_OWNER; | |
700 | if (!s->maxdata && s->maxdata_list) | |
701 | us->subd_flags |= SDF_MAXDATA; | |
702 | if (s->flaglist) | |
703 | us->subd_flags |= SDF_FLAGS; | |
704 | if (s->range_table_list) | |
705 | us->subd_flags |= SDF_RANGETYPE; | |
706 | if (s->do_cmd) | |
707 | us->subd_flags |= SDF_CMD; | |
708 | ||
709 | if (s->insn_bits != &insn_inval) | |
710 | us->insn_bits_support = COMEDI_SUPPORTED; | |
711 | else | |
712 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
713 | ||
714 | us->settling_time_0 = s->settling_time_0; | |
715 | } | |
716 | ||
bc252fd1 | 717 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
718 | |
719 | kfree(tmp); | |
720 | ||
721 | return ret ? -EFAULT : 0; | |
722 | } | |
723 | ||
724 | /* | |
725 | COMEDI_CHANINFO | |
726 | subdevice info ioctl | |
727 | ||
728 | arg: | |
729 | pointer to chaninfo structure | |
730 | ||
731 | reads: | |
732 | chaninfo structure at arg | |
733 | ||
734 | writes: | |
735 | arrays at elements of chaninfo structure | |
736 | ||
737 | */ | |
0a85b6f0 | 738 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 739 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 740 | { |
34c43922 | 741 | struct comedi_subdevice *s; |
a18b416d | 742 | struct comedi_chaninfo it; |
ed9eccbe | 743 | |
bc252fd1 | 744 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
745 | return -EFAULT; |
746 | ||
747 | if (it.subdev >= dev->n_subdevices) | |
748 | return -EINVAL; | |
b077f2cd | 749 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
750 | |
751 | if (it.maxdata_list) { | |
752 | if (s->maxdata || !s->maxdata_list) | |
753 | return -EINVAL; | |
754 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 755 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
756 | return -EFAULT; |
757 | } | |
758 | ||
759 | if (it.flaglist) { | |
760 | if (!s->flaglist) | |
761 | return -EINVAL; | |
762 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 763 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
764 | return -EFAULT; |
765 | } | |
766 | ||
767 | if (it.rangelist) { | |
768 | int i; | |
769 | ||
770 | if (!s->range_table_list) | |
771 | return -EINVAL; | |
772 | for (i = 0; i < s->n_chan; i++) { | |
773 | int x; | |
774 | ||
775 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 776 | (s->range_table_list[i]->length); |
81604d43 VK |
777 | if (put_user(x, it.rangelist + i)) |
778 | return -EFAULT; | |
ed9eccbe | 779 | } |
476b8477 GKH |
780 | #if 0 |
781 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 782 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
783 | return -EFAULT; |
784 | #endif | |
ed9eccbe DS |
785 | } |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
790 | /* | |
791 | COMEDI_BUFINFO | |
792 | buffer information ioctl | |
793 | ||
794 | arg: | |
795 | pointer to bufinfo structure | |
796 | ||
797 | reads: | |
798 | bufinfo at arg | |
799 | ||
800 | writes: | |
801 | modified bufinfo at arg | |
802 | ||
803 | */ | |
92d0127c | 804 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 805 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 806 | { |
9aa5339a | 807 | struct comedi_bufinfo bi; |
34c43922 | 808 | struct comedi_subdevice *s; |
d163679c | 809 | struct comedi_async *async; |
ed9eccbe | 810 | |
bc252fd1 | 811 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
812 | return -EFAULT; |
813 | ||
814 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
815 | return -EINVAL; | |
816 | ||
b077f2cd | 817 | s = &dev->subdevices[bi.subdevice]; |
53fa827e IA |
818 | |
819 | if (s->lock && s->lock != file) | |
820 | return -EACCES; | |
821 | ||
ed9eccbe DS |
822 | async = s->async; |
823 | ||
824 | if (!async) { | |
825 | DPRINTK("subdevice does not have async capability\n"); | |
826 | bi.buf_write_ptr = 0; | |
827 | bi.buf_read_ptr = 0; | |
828 | bi.buf_write_count = 0; | |
829 | bi.buf_read_count = 0; | |
4772c018 IA |
830 | bi.bytes_read = 0; |
831 | bi.bytes_written = 0; | |
ed9eccbe DS |
832 | goto copyback; |
833 | } | |
53fa827e IA |
834 | if (!s->busy) { |
835 | bi.bytes_read = 0; | |
836 | bi.bytes_written = 0; | |
837 | goto copyback_position; | |
838 | } | |
839 | if (s->busy != file) | |
840 | return -EACCES; | |
ed9eccbe DS |
841 | |
842 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
843 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
844 | comedi_buf_read_free(async, bi.bytes_read); | |
845 | ||
9682e28c HS |
846 | if (comedi_is_subdevice_idle(s) && |
847 | async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
848 | do_become_nonbusy(dev, s); |
849 | } | |
850 | } | |
851 | ||
852 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
853 | bi.bytes_written = | |
476b8477 | 854 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
855 | comedi_buf_write_free(async, bi.bytes_written); |
856 | } | |
857 | ||
53fa827e | 858 | copyback_position: |
ed9eccbe DS |
859 | bi.buf_write_count = async->buf_write_count; |
860 | bi.buf_write_ptr = async->buf_write_ptr; | |
861 | bi.buf_read_count = async->buf_read_count; | |
862 | bi.buf_read_ptr = async->buf_read_ptr; | |
863 | ||
476b8477 | 864 | copyback: |
bc252fd1 | 865 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
866 | return -EFAULT; |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
0a85b6f0 MT |
871 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
872 | unsigned int *data, void *file); | |
ed9eccbe | 873 | /* |
20617f22 PDP |
874 | * COMEDI_INSNLIST |
875 | * synchronous instructions | |
ed9eccbe | 876 | * |
20617f22 PDP |
877 | * arg: |
878 | * pointer to sync cmd structure | |
ed9eccbe | 879 | * |
20617f22 PDP |
880 | * reads: |
881 | * sync cmd struct at arg | |
882 | * instruction list | |
883 | * data (for writes) | |
ed9eccbe | 884 | * |
20617f22 PDP |
885 | * writes: |
886 | * data (for reads) | |
ed9eccbe DS |
887 | */ |
888 | /* arbitrary limits */ | |
889 | #define MAX_SAMPLES 256 | |
92d0127c GKH |
890 | static int do_insnlist_ioctl(struct comedi_device *dev, |
891 | struct comedi_insnlist __user *arg, void *file) | |
ed9eccbe | 892 | { |
da613f4f | 893 | struct comedi_insnlist insnlist; |
90035c08 | 894 | struct comedi_insn *insns = NULL; |
790c5541 | 895 | unsigned int *data = NULL; |
ed9eccbe DS |
896 | int i = 0; |
897 | int ret = 0; | |
898 | ||
bc252fd1 | 899 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) |
ed9eccbe DS |
900 | return -EFAULT; |
901 | ||
790c5541 | 902 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
903 | if (!data) { |
904 | DPRINTK("kmalloc failed\n"); | |
905 | ret = -ENOMEM; | |
906 | goto error; | |
907 | } | |
908 | ||
bc252fd1 | 909 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); |
ed9eccbe DS |
910 | if (!insns) { |
911 | DPRINTK("kmalloc failed\n"); | |
912 | ret = -ENOMEM; | |
913 | goto error; | |
914 | } | |
915 | ||
916 | if (copy_from_user(insns, insnlist.insns, | |
bc252fd1 | 917 | sizeof(*insns) * insnlist.n_insns)) { |
ed9eccbe DS |
918 | DPRINTK("copy_from_user failed\n"); |
919 | ret = -EFAULT; | |
920 | goto error; | |
921 | } | |
922 | ||
923 | for (i = 0; i < insnlist.n_insns; i++) { | |
924 | if (insns[i].n > MAX_SAMPLES) { | |
925 | DPRINTK("number of samples too large\n"); | |
926 | ret = -EINVAL; | |
927 | goto error; | |
928 | } | |
929 | if (insns[i].insn & INSN_MASK_WRITE) { | |
930 | if (copy_from_user(data, insns[i].data, | |
790c5541 | 931 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
932 | DPRINTK("copy_from_user failed\n"); |
933 | ret = -EFAULT; | |
934 | goto error; | |
935 | } | |
936 | } | |
937 | ret = parse_insn(dev, insns + i, data, file); | |
938 | if (ret < 0) | |
939 | goto error; | |
940 | if (insns[i].insn & INSN_MASK_READ) { | |
941 | if (copy_to_user(insns[i].data, data, | |
790c5541 | 942 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
943 | DPRINTK("copy_to_user failed\n"); |
944 | ret = -EFAULT; | |
945 | goto error; | |
946 | } | |
947 | } | |
948 | if (need_resched()) | |
949 | schedule(); | |
950 | } | |
951 | ||
476b8477 GKH |
952 | error: |
953 | kfree(insns); | |
954 | kfree(data); | |
ed9eccbe DS |
955 | |
956 | if (ret < 0) | |
957 | return ret; | |
958 | return i; | |
959 | } | |
960 | ||
0a85b6f0 MT |
961 | static int check_insn_config_length(struct comedi_insn *insn, |
962 | unsigned int *data) | |
ed9eccbe | 963 | { |
476b8477 GKH |
964 | if (insn->n < 1) |
965 | return -EINVAL; | |
ed9eccbe DS |
966 | |
967 | switch (data[0]) { | |
968 | case INSN_CONFIG_DIO_OUTPUT: | |
969 | case INSN_CONFIG_DIO_INPUT: | |
970 | case INSN_CONFIG_DISARM: | |
971 | case INSN_CONFIG_RESET: | |
972 | if (insn->n == 1) | |
973 | return 0; | |
974 | break; | |
975 | case INSN_CONFIG_ARM: | |
976 | case INSN_CONFIG_DIO_QUERY: | |
977 | case INSN_CONFIG_BLOCK_SIZE: | |
978 | case INSN_CONFIG_FILTER: | |
979 | case INSN_CONFIG_SERIAL_CLOCK: | |
980 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
981 | case INSN_CONFIG_ALT_SOURCE: | |
982 | case INSN_CONFIG_SET_COUNTER_MODE: | |
983 | case INSN_CONFIG_8254_READ_STATUS: | |
984 | case INSN_CONFIG_SET_ROUTING: | |
985 | case INSN_CONFIG_GET_ROUTING: | |
986 | case INSN_CONFIG_GET_PWM_STATUS: | |
987 | case INSN_CONFIG_PWM_SET_PERIOD: | |
988 | case INSN_CONFIG_PWM_GET_PERIOD: | |
989 | if (insn->n == 2) | |
990 | return 0; | |
991 | break; | |
992 | case INSN_CONFIG_SET_GATE_SRC: | |
993 | case INSN_CONFIG_GET_GATE_SRC: | |
994 | case INSN_CONFIG_SET_CLOCK_SRC: | |
995 | case INSN_CONFIG_GET_CLOCK_SRC: | |
996 | case INSN_CONFIG_SET_OTHER_SRC: | |
997 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
998 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
999 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1000 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1001 | if (insn->n == 3) | |
1002 | return 0; | |
1003 | break; | |
1004 | case INSN_CONFIG_PWM_OUTPUT: | |
1005 | case INSN_CONFIG_ANALOG_TRIG: | |
1006 | if (insn->n == 5) | |
1007 | return 0; | |
1008 | break; | |
b0a2b6d8 IA |
1009 | case INSN_CONFIG_DIGITAL_TRIG: |
1010 | if (insn->n == 6) | |
1011 | return 0; | |
1012 | break; | |
0a85b6f0 MT |
1013 | /* by default we allow the insn since we don't have checks for |
1014 | * all possible cases yet */ | |
ed9eccbe | 1015 | default: |
4f870fe6 IA |
1016 | pr_warn("comedi: No check for data length of config insn id %i is implemented.\n", |
1017 | data[0]); | |
1018 | pr_warn("comedi: Add a check to %s in %s.\n", | |
1019 | __func__, __FILE__); | |
1020 | pr_warn("comedi: Assuming n=%i is correct.\n", insn->n); | |
ed9eccbe | 1021 | return 0; |
ed9eccbe DS |
1022 | } |
1023 | return -EINVAL; | |
1024 | } | |
1025 | ||
0a85b6f0 MT |
1026 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1027 | unsigned int *data, void *file) | |
ed9eccbe | 1028 | { |
34c43922 | 1029 | struct comedi_subdevice *s; |
ed9eccbe DS |
1030 | int ret = 0; |
1031 | int i; | |
1032 | ||
1033 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1034 | /* a non-subdevice instruction */ | |
1035 | ||
1036 | switch (insn->insn) { | |
1037 | case INSN_GTOD: | |
1038 | { | |
1039 | struct timeval tv; | |
1040 | ||
1041 | if (insn->n != 2) { | |
1042 | ret = -EINVAL; | |
1043 | break; | |
1044 | } | |
1045 | ||
1046 | do_gettimeofday(&tv); | |
1047 | data[0] = tv.tv_sec; | |
1048 | data[1] = tv.tv_usec; | |
1049 | ret = 2; | |
1050 | ||
1051 | break; | |
1052 | } | |
1053 | case INSN_WAIT: | |
1054 | if (insn->n != 1 || data[0] >= 100000) { | |
1055 | ret = -EINVAL; | |
1056 | break; | |
1057 | } | |
1058 | udelay(data[0] / 1000); | |
1059 | ret = 1; | |
1060 | break; | |
1061 | case INSN_INTTRIG: | |
1062 | if (insn->n != 1) { | |
1063 | ret = -EINVAL; | |
1064 | break; | |
1065 | } | |
1066 | if (insn->subdev >= dev->n_subdevices) { | |
1067 | DPRINTK("%d not usable subdevice\n", | |
1068 | insn->subdev); | |
1069 | ret = -EINVAL; | |
1070 | break; | |
1071 | } | |
b077f2cd | 1072 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1073 | if (!s->async) { |
1074 | DPRINTK("no async\n"); | |
1075 | ret = -EINVAL; | |
1076 | break; | |
1077 | } | |
1078 | if (!s->async->inttrig) { | |
1079 | DPRINTK("no inttrig\n"); | |
1080 | ret = -EAGAIN; | |
1081 | break; | |
1082 | } | |
5d06e3df | 1083 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1084 | if (ret >= 0) |
1085 | ret = 1; | |
1086 | break; | |
1087 | default: | |
1088 | DPRINTK("invalid insn\n"); | |
1089 | ret = -EINVAL; | |
1090 | break; | |
1091 | } | |
1092 | } else { | |
1093 | /* a subdevice instruction */ | |
790c5541 | 1094 | unsigned int maxdata; |
ed9eccbe DS |
1095 | |
1096 | if (insn->subdev >= dev->n_subdevices) { | |
1097 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
1098 | ret = -EINVAL; | |
1099 | goto out; | |
1100 | } | |
b077f2cd | 1101 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1102 | |
1103 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1104 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
1105 | ret = -EIO; | |
1106 | goto out; | |
1107 | } | |
1108 | ||
1109 | /* are we locked? (ioctl lock) */ | |
1110 | if (s->lock && s->lock != file) { | |
1111 | DPRINTK("device locked\n"); | |
1112 | ret = -EACCES; | |
1113 | goto out; | |
1114 | } | |
1115 | ||
0fd0ca75 | 1116 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1117 | if (ret < 0) { |
ed9eccbe DS |
1118 | ret = -EINVAL; |
1119 | DPRINTK("bad chanspec\n"); | |
1120 | goto out; | |
1121 | } | |
1122 | ||
1123 | if (s->busy) { | |
1124 | ret = -EBUSY; | |
1125 | goto out; | |
1126 | } | |
1127 | /* This looks arbitrary. It is. */ | |
1128 | s->busy = &parse_insn; | |
1129 | switch (insn->insn) { | |
1130 | case INSN_READ: | |
1131 | ret = s->insn_read(dev, s, insn, data); | |
1132 | break; | |
1133 | case INSN_WRITE: | |
1134 | maxdata = s->maxdata_list | |
476b8477 GKH |
1135 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1136 | : s->maxdata; | |
ed9eccbe DS |
1137 | for (i = 0; i < insn->n; ++i) { |
1138 | if (data[i] > maxdata) { | |
1139 | ret = -EINVAL; | |
1140 | DPRINTK("bad data value(s)\n"); | |
1141 | break; | |
1142 | } | |
1143 | } | |
1144 | if (ret == 0) | |
1145 | ret = s->insn_write(dev, s, insn, data); | |
1146 | break; | |
1147 | case INSN_BITS: | |
1148 | if (insn->n != 2) { | |
1149 | ret = -EINVAL; | |
2f644ccf IA |
1150 | } else { |
1151 | /* Most drivers ignore the base channel in | |
1152 | * insn->chanspec. Fix this here if | |
1153 | * the subdevice has <= 32 channels. */ | |
1154 | unsigned int shift; | |
1155 | unsigned int orig_mask; | |
1156 | ||
1157 | orig_mask = data[0]; | |
1158 | if (s->n_chan <= 32) { | |
1159 | shift = CR_CHAN(insn->chanspec); | |
1160 | if (shift > 0) { | |
1161 | insn->chanspec = 0; | |
1162 | data[0] <<= shift; | |
1163 | data[1] <<= shift; | |
1164 | } | |
1165 | } else | |
1166 | shift = 0; | |
1167 | ret = s->insn_bits(dev, s, insn, data); | |
1168 | data[0] = orig_mask; | |
1169 | if (shift > 0) | |
1170 | data[1] >>= shift; | |
ed9eccbe | 1171 | } |
ed9eccbe DS |
1172 | break; |
1173 | case INSN_CONFIG: | |
1174 | ret = check_insn_config_length(insn, data); | |
1175 | if (ret) | |
1176 | break; | |
1177 | ret = s->insn_config(dev, s, insn, data); | |
1178 | break; | |
1179 | default: | |
1180 | ret = -EINVAL; | |
1181 | break; | |
1182 | } | |
1183 | ||
1184 | s->busy = NULL; | |
1185 | } | |
1186 | ||
476b8477 | 1187 | out: |
ed9eccbe DS |
1188 | return ret; |
1189 | } | |
1190 | ||
1191 | /* | |
20617f22 PDP |
1192 | * COMEDI_INSN |
1193 | * synchronous instructions | |
ed9eccbe | 1194 | * |
20617f22 PDP |
1195 | * arg: |
1196 | * pointer to insn | |
ed9eccbe | 1197 | * |
20617f22 PDP |
1198 | * reads: |
1199 | * struct comedi_insn struct at arg | |
1200 | * data (for writes) | |
ed9eccbe | 1201 | * |
20617f22 PDP |
1202 | * writes: |
1203 | * data (for reads) | |
ed9eccbe | 1204 | */ |
92d0127c GKH |
1205 | static int do_insn_ioctl(struct comedi_device *dev, |
1206 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1207 | { |
90035c08 | 1208 | struct comedi_insn insn; |
790c5541 | 1209 | unsigned int *data = NULL; |
ed9eccbe DS |
1210 | int ret = 0; |
1211 | ||
790c5541 | 1212 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
1213 | if (!data) { |
1214 | ret = -ENOMEM; | |
1215 | goto error; | |
1216 | } | |
1217 | ||
bc252fd1 | 1218 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1219 | ret = -EFAULT; |
1220 | goto error; | |
1221 | } | |
1222 | ||
1223 | /* This is where the behavior of insn and insnlist deviate. */ | |
1224 | if (insn.n > MAX_SAMPLES) | |
1225 | insn.n = MAX_SAMPLES; | |
1226 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1227 | if (copy_from_user(data, |
1228 | insn.data, | |
1229 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1230 | ret = -EFAULT; |
1231 | goto error; | |
1232 | } | |
1233 | } | |
1234 | ret = parse_insn(dev, &insn, data, file); | |
1235 | if (ret < 0) | |
1236 | goto error; | |
1237 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1238 | if (copy_to_user(insn.data, |
1239 | data, | |
1240 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1241 | ret = -EFAULT; |
1242 | goto error; | |
1243 | } | |
1244 | } | |
1245 | ret = insn.n; | |
1246 | ||
476b8477 GKH |
1247 | error: |
1248 | kfree(data); | |
ed9eccbe DS |
1249 | |
1250 | return ret; | |
1251 | } | |
1252 | ||
92d0127c | 1253 | static int do_cmd_ioctl(struct comedi_device *dev, |
cbe01f72 | 1254 | struct comedi_cmd __user *arg, void *file) |
ed9eccbe | 1255 | { |
88bc0574 | 1256 | struct comedi_cmd cmd; |
34c43922 | 1257 | struct comedi_subdevice *s; |
d163679c | 1258 | struct comedi_async *async; |
ed9eccbe | 1259 | int ret = 0; |
95bc359f | 1260 | unsigned int __user *user_chanlist; |
ed9eccbe | 1261 | |
bc252fd1 | 1262 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1263 | DPRINTK("bad cmd address\n"); |
1264 | return -EFAULT; | |
1265 | } | |
476b8477 | 1266 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1267 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1268 | |
88bc0574 HS |
1269 | if (cmd.subdev >= dev->n_subdevices) { |
1270 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1271 | return -ENODEV; |
1272 | } | |
1273 | ||
88bc0574 | 1274 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe DS |
1275 | async = s->async; |
1276 | ||
1277 | if (s->type == COMEDI_SUBD_UNUSED) { | |
88bc0574 | 1278 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1279 | return -EIO; |
1280 | } | |
1281 | ||
1282 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1283 | DPRINTK("subdevice %i does not support commands\n", | |
88bc0574 | 1284 | cmd.subdev); |
ed9eccbe DS |
1285 | return -EIO; |
1286 | } | |
1287 | ||
1288 | /* are we locked? (ioctl lock) */ | |
1289 | if (s->lock && s->lock != file) { | |
1290 | DPRINTK("subdevice locked\n"); | |
1291 | return -EACCES; | |
1292 | } | |
1293 | ||
1294 | /* are we busy? */ | |
1295 | if (s->busy) { | |
1296 | DPRINTK("subdevice busy\n"); | |
1297 | return -EBUSY; | |
1298 | } | |
1299 | s->busy = file; | |
1300 | ||
1301 | /* make sure channel/gain list isn't too long */ | |
88bc0574 | 1302 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1303 | DPRINTK("channel/gain list too long %u > %d\n", |
88bc0574 | 1304 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1305 | ret = -EINVAL; |
1306 | goto cleanup; | |
1307 | } | |
1308 | ||
1309 | /* make sure channel/gain list isn't too short */ | |
88bc0574 | 1310 | if (cmd.chanlist_len < 1) { |
ed9eccbe | 1311 | DPRINTK("channel/gain list too short %u < 1\n", |
88bc0574 | 1312 | cmd.chanlist_len); |
ed9eccbe DS |
1313 | ret = -EINVAL; |
1314 | goto cleanup; | |
1315 | } | |
1316 | ||
88bc0574 | 1317 | async->cmd = cmd; |
ed9eccbe DS |
1318 | async->cmd.data = NULL; |
1319 | /* load channel/gain list */ | |
1320 | async->cmd.chanlist = | |
476b8477 | 1321 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1322 | if (!async->cmd.chanlist) { |
1323 | DPRINTK("allocation failed\n"); | |
1324 | ret = -ENOMEM; | |
1325 | goto cleanup; | |
1326 | } | |
1327 | ||
95bc359f | 1328 | if (copy_from_user(async->cmd.chanlist, user_chanlist, |
476b8477 | 1329 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1330 | DPRINTK("fault reading chanlist\n"); |
1331 | ret = -EFAULT; | |
1332 | goto cleanup; | |
1333 | } | |
1334 | ||
1335 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1336 | ret = comedi_check_chanlist(s, |
1337 | async->cmd.chanlist_len, | |
1338 | async->cmd.chanlist); | |
476b8477 | 1339 | if (ret < 0) { |
ed9eccbe DS |
1340 | DPRINTK("bad chanlist\n"); |
1341 | goto cleanup; | |
1342 | } | |
1343 | ||
1344 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1345 | ||
1346 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1347 | DPRINTK("test returned %d\n", ret); | |
88bc0574 | 1348 | cmd = async->cmd; |
476b8477 | 1349 | /* restore chanlist pointer before copying back */ |
95bc359f | 1350 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1351 | cmd.data = NULL; |
bc252fd1 | 1352 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1353 | DPRINTK("fault writing cmd\n"); |
1354 | ret = -EFAULT; | |
1355 | goto cleanup; | |
1356 | } | |
1357 | ret = -EAGAIN; | |
1358 | goto cleanup; | |
1359 | } | |
1360 | ||
1361 | if (!async->prealloc_bufsz) { | |
1362 | ret = -ENOMEM; | |
1363 | DPRINTK("no buffer (?)\n"); | |
1364 | goto cleanup; | |
1365 | } | |
1366 | ||
1367 | comedi_reset_async_buf(async); | |
1368 | ||
1369 | async->cb_mask = | |
476b8477 GKH |
1370 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1371 | COMEDI_CB_OVERFLOW; | |
1372 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1373 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1374 | |
1375 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1376 | ||
ed9eccbe DS |
1377 | ret = s->do_cmd(dev, s); |
1378 | if (ret == 0) | |
1379 | return 0; | |
1380 | ||
476b8477 | 1381 | cleanup: |
ed9eccbe DS |
1382 | do_become_nonbusy(dev, s); |
1383 | ||
1384 | return ret; | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | COMEDI_CMDTEST | |
1389 | command testing ioctl | |
1390 | ||
1391 | arg: | |
1392 | pointer to cmd structure | |
1393 | ||
1394 | reads: | |
1395 | cmd structure at arg | |
1396 | channel/range list | |
1397 | ||
1398 | writes: | |
1399 | modified cmd structure at arg | |
1400 | ||
1401 | */ | |
92d0127c GKH |
1402 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1403 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1404 | { |
f8348677 | 1405 | struct comedi_cmd cmd; |
34c43922 | 1406 | struct comedi_subdevice *s; |
ed9eccbe DS |
1407 | int ret = 0; |
1408 | unsigned int *chanlist = NULL; | |
95bc359f | 1409 | unsigned int __user *user_chanlist; |
ed9eccbe | 1410 | |
bc252fd1 | 1411 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1412 | DPRINTK("bad cmd address\n"); |
1413 | return -EFAULT; | |
1414 | } | |
476b8477 | 1415 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1416 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1417 | |
f8348677 HS |
1418 | if (cmd.subdev >= dev->n_subdevices) { |
1419 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1420 | return -ENODEV; |
1421 | } | |
1422 | ||
f8348677 | 1423 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1424 | if (s->type == COMEDI_SUBD_UNUSED) { |
f8348677 | 1425 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1426 | return -EIO; |
1427 | } | |
1428 | ||
1429 | if (!s->do_cmd || !s->do_cmdtest) { | |
1430 | DPRINTK("subdevice %i does not support commands\n", | |
f8348677 | 1431 | cmd.subdev); |
ed9eccbe DS |
1432 | return -EIO; |
1433 | } | |
1434 | ||
1435 | /* make sure channel/gain list isn't too long */ | |
f8348677 | 1436 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1437 | DPRINTK("channel/gain list too long %d > %d\n", |
f8348677 | 1438 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1439 | ret = -EINVAL; |
1440 | goto cleanup; | |
1441 | } | |
1442 | ||
1443 | /* load channel/gain list */ | |
f8348677 | 1444 | if (cmd.chanlist) { |
ed9eccbe | 1445 | chanlist = |
f8348677 | 1446 | kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1447 | if (!chanlist) { |
1448 | DPRINTK("allocation failed\n"); | |
1449 | ret = -ENOMEM; | |
1450 | goto cleanup; | |
1451 | } | |
1452 | ||
95bc359f | 1453 | if (copy_from_user(chanlist, user_chanlist, |
f8348677 | 1454 | cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1455 | DPRINTK("fault reading chanlist\n"); |
1456 | ret = -EFAULT; | |
1457 | goto cleanup; | |
1458 | } | |
1459 | ||
1460 | /* make sure each element in channel/gain list is valid */ | |
f8348677 | 1461 | ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist); |
476b8477 | 1462 | if (ret < 0) { |
ed9eccbe DS |
1463 | DPRINTK("bad chanlist\n"); |
1464 | goto cleanup; | |
1465 | } | |
1466 | ||
f8348677 | 1467 | cmd.chanlist = chanlist; |
ed9eccbe DS |
1468 | } |
1469 | ||
f8348677 | 1470 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1471 | |
476b8477 | 1472 | /* restore chanlist pointer before copying back */ |
95bc359f | 1473 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1474 | |
bc252fd1 | 1475 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1476 | DPRINTK("bad cmd address\n"); |
1477 | ret = -EFAULT; | |
1478 | goto cleanup; | |
1479 | } | |
476b8477 GKH |
1480 | cleanup: |
1481 | kfree(chanlist); | |
ed9eccbe DS |
1482 | |
1483 | return ret; | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | COMEDI_LOCK | |
1488 | lock subdevice | |
1489 | ||
1490 | arg: | |
1491 | subdevice number | |
1492 | ||
1493 | reads: | |
1494 | none | |
1495 | ||
1496 | writes: | |
1497 | none | |
1498 | ||
1499 | */ | |
1500 | ||
0a85b6f0 MT |
1501 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1502 | void *file) | |
ed9eccbe DS |
1503 | { |
1504 | int ret = 0; | |
1505 | unsigned long flags; | |
34c43922 | 1506 | struct comedi_subdevice *s; |
ed9eccbe DS |
1507 | |
1508 | if (arg >= dev->n_subdevices) | |
1509 | return -EINVAL; | |
b077f2cd | 1510 | s = &dev->subdevices[arg]; |
ed9eccbe | 1511 | |
5f74ea14 | 1512 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1513 | if (s->busy || s->lock) |
ed9eccbe | 1514 | ret = -EBUSY; |
476b8477 | 1515 | else |
ed9eccbe | 1516 | s->lock = file; |
5f74ea14 | 1517 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1518 | |
c5274ab0 | 1519 | #if 0 |
ed9eccbe DS |
1520 | if (ret < 0) |
1521 | return ret; | |
1522 | ||
ed9eccbe DS |
1523 | if (s->lock_f) |
1524 | ret = s->lock_f(dev, s); | |
1525 | #endif | |
1526 | ||
1527 | return ret; | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | COMEDI_UNLOCK | |
1532 | unlock subdevice | |
1533 | ||
1534 | arg: | |
1535 | subdevice number | |
1536 | ||
1537 | reads: | |
1538 | none | |
1539 | ||
1540 | writes: | |
1541 | none | |
1542 | ||
1543 | This function isn't protected by the semaphore, since | |
1544 | we already own the lock. | |
1545 | */ | |
0a85b6f0 MT |
1546 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1547 | void *file) | |
ed9eccbe | 1548 | { |
34c43922 | 1549 | struct comedi_subdevice *s; |
ed9eccbe DS |
1550 | |
1551 | if (arg >= dev->n_subdevices) | |
1552 | return -EINVAL; | |
b077f2cd | 1553 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1554 | |
1555 | if (s->busy) | |
1556 | return -EBUSY; | |
1557 | ||
1558 | if (s->lock && s->lock != file) | |
1559 | return -EACCES; | |
1560 | ||
1561 | if (s->lock == file) { | |
1562 | #if 0 | |
1563 | if (s->unlock) | |
1564 | s->unlock(dev, s); | |
1565 | #endif | |
1566 | ||
1567 | s->lock = NULL; | |
1568 | } | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | /* | |
1574 | COMEDI_CANCEL | |
1575 | cancel acquisition ioctl | |
1576 | ||
1577 | arg: | |
1578 | subdevice number | |
1579 | ||
1580 | reads: | |
1581 | nothing | |
1582 | ||
1583 | writes: | |
1584 | nothing | |
1585 | ||
1586 | */ | |
0a85b6f0 MT |
1587 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1588 | void *file) | |
ed9eccbe | 1589 | { |
34c43922 | 1590 | struct comedi_subdevice *s; |
ed9eccbe DS |
1591 | |
1592 | if (arg >= dev->n_subdevices) | |
1593 | return -EINVAL; | |
b077f2cd | 1594 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1595 | if (s->async == NULL) |
1596 | return -EINVAL; | |
1597 | ||
1598 | if (s->lock && s->lock != file) | |
1599 | return -EACCES; | |
1600 | ||
1601 | if (!s->busy) | |
1602 | return 0; | |
1603 | ||
1604 | if (s->busy != file) | |
1605 | return -EBUSY; | |
1606 | ||
1607 | return do_cancel(dev, s); | |
1608 | } | |
1609 | ||
1610 | /* | |
1611 | COMEDI_POLL ioctl | |
1612 | instructs driver to synchronize buffers | |
1613 | ||
1614 | arg: | |
1615 | subdevice number | |
1616 | ||
1617 | reads: | |
1618 | nothing | |
1619 | ||
1620 | writes: | |
1621 | nothing | |
1622 | ||
1623 | */ | |
0a85b6f0 MT |
1624 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1625 | void *file) | |
ed9eccbe | 1626 | { |
34c43922 | 1627 | struct comedi_subdevice *s; |
ed9eccbe DS |
1628 | |
1629 | if (arg >= dev->n_subdevices) | |
1630 | return -EINVAL; | |
b077f2cd | 1631 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1632 | |
1633 | if (s->lock && s->lock != file) | |
1634 | return -EACCES; | |
1635 | ||
1636 | if (!s->busy) | |
1637 | return 0; | |
1638 | ||
1639 | if (s->busy != file) | |
1640 | return -EBUSY; | |
1641 | ||
1642 | if (s->poll) | |
1643 | return s->poll(dev, s); | |
1644 | ||
1645 | return -EINVAL; | |
1646 | } | |
1647 | ||
47db6d58 HS |
1648 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1649 | unsigned long arg) | |
1650 | { | |
1651 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
17cb3be6 | 1652 | struct comedi_file_info *info = comedi_file_info_from_minor(minor); |
ba1bcf6f | 1653 | struct comedi_device *dev = comedi_dev_from_file_info(info); |
47db6d58 HS |
1654 | int rc; |
1655 | ||
4da5fa9a | 1656 | if (!dev) |
47db6d58 | 1657 | return -ENODEV; |
47db6d58 HS |
1658 | |
1659 | mutex_lock(&dev->mutex); | |
1660 | ||
1661 | /* Device config is special, because it must work on | |
1662 | * an unconfigured device. */ | |
1663 | if (cmd == COMEDI_DEVCONFIG) { | |
1664 | rc = do_devconfig_ioctl(dev, | |
1665 | (struct comedi_devconfig __user *)arg); | |
7d3135af IA |
1666 | if (rc == 0) |
1667 | /* Evade comedi_auto_unconfig(). */ | |
17cb3be6 | 1668 | info->hardware_device = NULL; |
47db6d58 HS |
1669 | goto done; |
1670 | } | |
1671 | ||
1672 | if (!dev->attached) { | |
1673 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
1674 | rc = -ENODEV; | |
1675 | goto done; | |
1676 | } | |
1677 | ||
1678 | switch (cmd) { | |
1679 | case COMEDI_BUFCONFIG: | |
1680 | rc = do_bufconfig_ioctl(dev, | |
1681 | (struct comedi_bufconfig __user *)arg); | |
1682 | break; | |
1683 | case COMEDI_DEVINFO: | |
1684 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
1685 | file); | |
1686 | break; | |
1687 | case COMEDI_SUBDINFO: | |
1688 | rc = do_subdinfo_ioctl(dev, | |
1689 | (struct comedi_subdinfo __user *)arg, | |
1690 | file); | |
1691 | break; | |
1692 | case COMEDI_CHANINFO: | |
1693 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
1694 | break; | |
1695 | case COMEDI_RANGEINFO: | |
1696 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
1697 | break; | |
1698 | case COMEDI_BUFINFO: | |
1699 | rc = do_bufinfo_ioctl(dev, | |
1700 | (struct comedi_bufinfo __user *)arg, | |
1701 | file); | |
1702 | break; | |
1703 | case COMEDI_LOCK: | |
1704 | rc = do_lock_ioctl(dev, arg, file); | |
1705 | break; | |
1706 | case COMEDI_UNLOCK: | |
1707 | rc = do_unlock_ioctl(dev, arg, file); | |
1708 | break; | |
1709 | case COMEDI_CANCEL: | |
1710 | rc = do_cancel_ioctl(dev, arg, file); | |
1711 | break; | |
1712 | case COMEDI_CMD: | |
1713 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
1714 | break; | |
1715 | case COMEDI_CMDTEST: | |
1716 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
1717 | file); | |
1718 | break; | |
1719 | case COMEDI_INSNLIST: | |
1720 | rc = do_insnlist_ioctl(dev, | |
1721 | (struct comedi_insnlist __user *)arg, | |
1722 | file); | |
1723 | break; | |
1724 | case COMEDI_INSN: | |
1725 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
1726 | file); | |
1727 | break; | |
1728 | case COMEDI_POLL: | |
1729 | rc = do_poll_ioctl(dev, arg, file); | |
1730 | break; | |
1731 | default: | |
1732 | rc = -ENOTTY; | |
1733 | break; | |
1734 | } | |
1735 | ||
1736 | done: | |
1737 | mutex_unlock(&dev->mutex); | |
1738 | return rc; | |
1739 | } | |
1740 | ||
df30b21c FV |
1741 | static void comedi_vm_open(struct vm_area_struct *area) |
1742 | { | |
1743 | struct comedi_async *async; | |
1744 | struct comedi_device *dev; | |
1745 | ||
1746 | async = area->vm_private_data; | |
1747 | dev = async->subdevice->device; | |
1748 | ||
1749 | mutex_lock(&dev->mutex); | |
1750 | async->mmap_count++; | |
1751 | mutex_unlock(&dev->mutex); | |
1752 | } | |
1753 | ||
1754 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 1755 | { |
d163679c | 1756 | struct comedi_async *async; |
71b5f4f1 | 1757 | struct comedi_device *dev; |
ed9eccbe DS |
1758 | |
1759 | async = area->vm_private_data; | |
1760 | dev = async->subdevice->device; | |
1761 | ||
1762 | mutex_lock(&dev->mutex); | |
1763 | async->mmap_count--; | |
1764 | mutex_unlock(&dev->mutex); | |
1765 | } | |
1766 | ||
1767 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
1768 | .open = comedi_vm_open, |
1769 | .close = comedi_vm_close, | |
ed9eccbe DS |
1770 | }; |
1771 | ||
1772 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1773 | { | |
1774 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
a52840a9 | 1775 | struct comedi_file_info *info = comedi_file_info_from_minor(minor); |
ba1bcf6f | 1776 | struct comedi_device *dev = comedi_dev_from_file_info(info); |
a52840a9 HS |
1777 | struct comedi_subdevice *s; |
1778 | struct comedi_async *async; | |
ed9eccbe DS |
1779 | unsigned long start = vma->vm_start; |
1780 | unsigned long size; | |
1781 | int n_pages; | |
1782 | int i; | |
1783 | int retval; | |
3ffab428 | 1784 | |
a52840a9 | 1785 | if (!dev) |
70fe742c | 1786 | return -ENODEV; |
ed9eccbe DS |
1787 | |
1788 | mutex_lock(&dev->mutex); | |
a52840a9 | 1789 | |
ed9eccbe DS |
1790 | if (!dev->attached) { |
1791 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1792 | retval = -ENODEV; | |
1793 | goto done; | |
1794 | } | |
a52840a9 | 1795 | |
476b8477 | 1796 | if (vma->vm_flags & VM_WRITE) |
7d8a2567 | 1797 | s = comedi_write_subdevice(info); |
476b8477 | 1798 | else |
7d8a2567 | 1799 | s = comedi_read_subdevice(info); |
a52840a9 | 1800 | if (!s) { |
ed9eccbe DS |
1801 | retval = -EINVAL; |
1802 | goto done; | |
1803 | } | |
a52840a9 | 1804 | |
ed9eccbe | 1805 | async = s->async; |
a52840a9 | 1806 | if (!async) { |
ed9eccbe DS |
1807 | retval = -EINVAL; |
1808 | goto done; | |
1809 | } | |
1810 | ||
1811 | if (vma->vm_pgoff != 0) { | |
1812 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1813 | retval = -EINVAL; | |
1814 | goto done; | |
1815 | } | |
1816 | ||
1817 | size = vma->vm_end - vma->vm_start; | |
1818 | if (size > async->prealloc_bufsz) { | |
1819 | retval = -EFAULT; | |
1820 | goto done; | |
1821 | } | |
1822 | if (size & (~PAGE_MASK)) { | |
1823 | retval = -EFAULT; | |
1824 | goto done; | |
1825 | } | |
1826 | ||
1827 | n_pages = size >> PAGE_SHIFT; | |
1828 | for (i = 0; i < n_pages; ++i) { | |
a52840a9 HS |
1829 | struct comedi_buf_page *buf = &async->buf_page_list[i]; |
1830 | ||
ed9eccbe | 1831 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
1832 | page_to_pfn(virt_to_page(buf->virt_addr)), |
1833 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
1834 | retval = -EAGAIN; |
1835 | goto done; | |
1836 | } | |
1837 | start += PAGE_SIZE; | |
1838 | } | |
1839 | ||
1840 | vma->vm_ops = &comedi_vm_ops; | |
1841 | vma->vm_private_data = async; | |
1842 | ||
1843 | async->mmap_count++; | |
1844 | ||
1845 | retval = 0; | |
476b8477 | 1846 | done: |
ed9eccbe DS |
1847 | mutex_unlock(&dev->mutex); |
1848 | return retval; | |
1849 | } | |
1850 | ||
1ae5062a | 1851 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1852 | { |
1853 | unsigned int mask = 0; | |
1854 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
ed69335c | 1855 | struct comedi_file_info *info = comedi_file_info_from_minor(minor); |
ba1bcf6f | 1856 | struct comedi_device *dev = comedi_dev_from_file_info(info); |
ca081b1d | 1857 | struct comedi_subdevice *s; |
3ffab428 | 1858 | |
ca081b1d | 1859 | if (!dev) |
70fe742c | 1860 | return -ENODEV; |
ed9eccbe DS |
1861 | |
1862 | mutex_lock(&dev->mutex); | |
ca081b1d | 1863 | |
ed9eccbe DS |
1864 | if (!dev->attached) { |
1865 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
ca081b1d | 1866 | goto done; |
ed9eccbe DS |
1867 | } |
1868 | ||
ca081b1d HS |
1869 | s = comedi_read_subdevice(info); |
1870 | if (s) { | |
1871 | poll_wait(file, &s->async->wait_head, wait); | |
f0124630 | 1872 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 1873 | comedi_buf_read_n_available(s->async) > 0) |
ed9eccbe | 1874 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 1875 | } |
ca081b1d HS |
1876 | |
1877 | s = comedi_write_subdevice(info); | |
1878 | if (s) { | |
1879 | unsigned int bps = bytes_per_sample(s->async->subdevice); | |
1880 | ||
1881 | poll_wait(file, &s->async->wait_head, wait); | |
1882 | comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz); | |
f0124630 | 1883 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 1884 | comedi_buf_write_n_allocated(s->async) >= bps) |
ed9eccbe | 1885 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
1886 | } |
1887 | ||
ca081b1d | 1888 | done: |
ed9eccbe DS |
1889 | mutex_unlock(&dev->mutex); |
1890 | return mask; | |
1891 | } | |
1892 | ||
92d0127c GKH |
1893 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
1894 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 1895 | { |
34c43922 | 1896 | struct comedi_subdevice *s; |
d163679c | 1897 | struct comedi_async *async; |
ed9eccbe DS |
1898 | int n, m, count = 0, retval = 0; |
1899 | DECLARE_WAITQUEUE(wait, current); | |
1900 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
ed69335c | 1901 | struct comedi_file_info *info = comedi_file_info_from_minor(minor); |
ba1bcf6f | 1902 | struct comedi_device *dev = comedi_dev_from_file_info(info); |
3ffab428 | 1903 | |
2714b019 | 1904 | if (!dev) |
70fe742c | 1905 | return -ENODEV; |
ed9eccbe DS |
1906 | |
1907 | if (!dev->attached) { | |
1908 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
2714b019 | 1909 | return -ENODEV; |
ed9eccbe DS |
1910 | } |
1911 | ||
7d8a2567 | 1912 | s = comedi_write_subdevice(info); |
2714b019 HS |
1913 | if (!s) |
1914 | return -EIO; | |
1915 | ||
ed9eccbe DS |
1916 | async = s->async; |
1917 | ||
2714b019 HS |
1918 | if (!s->busy || !nbytes) |
1919 | return 0; | |
1920 | if (s->busy != file) | |
1921 | return -EACCES; | |
1922 | ||
ed9eccbe DS |
1923 | add_wait_queue(&async->wait_head, &wait); |
1924 | while (nbytes > 0 && !retval) { | |
1925 | set_current_state(TASK_INTERRUPTIBLE); | |
1926 | ||
f0124630 | 1927 | if (!comedi_is_subdevice_running(s)) { |
d2611540 | 1928 | if (count == 0) { |
c098c21a | 1929 | if (comedi_is_subdevice_in_error(s)) |
d2611540 | 1930 | retval = -EPIPE; |
c098c21a | 1931 | else |
d2611540 | 1932 | retval = 0; |
d2611540 IA |
1933 | do_become_nonbusy(dev, s); |
1934 | } | |
1935 | break; | |
1936 | } | |
1937 | ||
ed9eccbe DS |
1938 | n = nbytes; |
1939 | ||
1940 | m = n; | |
476b8477 | 1941 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1942 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1943 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1944 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1945 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1946 | if (m < n) |
1947 | n = m; | |
1948 | ||
1949 | if (n == 0) { | |
ed9eccbe DS |
1950 | if (file->f_flags & O_NONBLOCK) { |
1951 | retval = -EAGAIN; | |
1952 | break; | |
1953 | } | |
6a9ce6b6 | 1954 | schedule(); |
ed9eccbe DS |
1955 | if (signal_pending(current)) { |
1956 | retval = -ERESTARTSYS; | |
1957 | break; | |
1958 | } | |
476b8477 | 1959 | if (!s->busy) |
ed9eccbe | 1960 | break; |
ed9eccbe DS |
1961 | if (s->busy != file) { |
1962 | retval = -EACCES; | |
1963 | break; | |
1964 | } | |
1965 | continue; | |
1966 | } | |
1967 | ||
1968 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1969 | buf, n); |
ed9eccbe DS |
1970 | if (m) { |
1971 | n -= m; | |
1972 | retval = -EFAULT; | |
1973 | } | |
1974 | comedi_buf_write_free(async, n); | |
1975 | ||
1976 | count += n; | |
1977 | nbytes -= n; | |
1978 | ||
1979 | buf += n; | |
1980 | break; /* makes device work like a pipe */ | |
1981 | } | |
1982 | set_current_state(TASK_RUNNING); | |
1983 | remove_wait_queue(&async->wait_head, &wait); | |
1984 | ||
476b8477 | 1985 | return count ? count : retval; |
ed9eccbe DS |
1986 | } |
1987 | ||
92d0127c | 1988 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 1989 | loff_t *offset) |
ed9eccbe | 1990 | { |
34c43922 | 1991 | struct comedi_subdevice *s; |
d163679c | 1992 | struct comedi_async *async; |
ed9eccbe DS |
1993 | int n, m, count = 0, retval = 0; |
1994 | DECLARE_WAITQUEUE(wait, current); | |
1995 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
ed69335c | 1996 | struct comedi_file_info *info = comedi_file_info_from_minor(minor); |
ba1bcf6f | 1997 | struct comedi_device *dev = comedi_dev_from_file_info(info); |
3ffab428 | 1998 | |
5c87fef5 | 1999 | if (!dev) |
70fe742c | 2000 | return -ENODEV; |
ed9eccbe DS |
2001 | |
2002 | if (!dev->attached) { | |
2003 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
5c87fef5 | 2004 | return -ENODEV; |
ed9eccbe DS |
2005 | } |
2006 | ||
7d8a2567 | 2007 | s = comedi_read_subdevice(info); |
5c87fef5 HS |
2008 | if (!s) |
2009 | return -EIO; | |
2010 | ||
ed9eccbe | 2011 | async = s->async; |
5c87fef5 HS |
2012 | if (!s->busy || !nbytes) |
2013 | return 0; | |
2014 | if (s->busy != file) | |
2015 | return -EACCES; | |
ed9eccbe DS |
2016 | |
2017 | add_wait_queue(&async->wait_head, &wait); | |
2018 | while (nbytes > 0 && !retval) { | |
2019 | set_current_state(TASK_INTERRUPTIBLE); | |
2020 | ||
2021 | n = nbytes; | |
2022 | ||
2023 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
2024 | /* printk("%d available\n",m); */ |
2025 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 2026 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 2027 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
2028 | if (m < n) |
2029 | n = m; | |
2030 | ||
2031 | if (n == 0) { | |
f0124630 | 2032 | if (!comedi_is_subdevice_running(s)) { |
ed9eccbe | 2033 | do_become_nonbusy(dev, s); |
c098c21a | 2034 | if (comedi_is_subdevice_in_error(s)) |
ed9eccbe | 2035 | retval = -EPIPE; |
c098c21a | 2036 | else |
ed9eccbe | 2037 | retval = 0; |
ed9eccbe DS |
2038 | break; |
2039 | } | |
2040 | if (file->f_flags & O_NONBLOCK) { | |
2041 | retval = -EAGAIN; | |
2042 | break; | |
2043 | } | |
6a9ce6b6 | 2044 | schedule(); |
ed9eccbe DS |
2045 | if (signal_pending(current)) { |
2046 | retval = -ERESTARTSYS; | |
2047 | break; | |
2048 | } | |
ed9eccbe DS |
2049 | if (!s->busy) { |
2050 | retval = 0; | |
2051 | break; | |
2052 | } | |
2053 | if (s->busy != file) { | |
2054 | retval = -EACCES; | |
2055 | break; | |
2056 | } | |
2057 | continue; | |
2058 | } | |
2059 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2060 | async->buf_read_ptr, n); |
ed9eccbe DS |
2061 | if (m) { |
2062 | n -= m; | |
2063 | retval = -EFAULT; | |
2064 | } | |
2065 | ||
2066 | comedi_buf_read_alloc(async, n); | |
2067 | comedi_buf_read_free(async, n); | |
2068 | ||
2069 | count += n; | |
2070 | nbytes -= n; | |
2071 | ||
2072 | buf += n; | |
2073 | break; /* makes device work like a pipe */ | |
2074 | } | |
9682e28c | 2075 | if (comedi_is_subdevice_idle(s) && |
476b8477 | 2076 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
2077 | do_become_nonbusy(dev, s); |
2078 | } | |
2079 | set_current_state(TASK_RUNNING); | |
2080 | remove_wait_queue(&async->wait_head, &wait); | |
2081 | ||
476b8477 | 2082 | return count ? count : retval; |
ed9eccbe DS |
2083 | } |
2084 | ||
ed9eccbe DS |
2085 | static int comedi_open(struct inode *inode, struct file *file) |
2086 | { | |
ed9eccbe | 2087 | const unsigned minor = iminor(inode); |
4da5fa9a | 2088 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
97920071 | 2089 | |
4da5fa9a | 2090 | if (!dev) { |
ed9eccbe DS |
2091 | DPRINTK("invalid minor number\n"); |
2092 | return -ENODEV; | |
2093 | } | |
2094 | ||
2095 | /* This is slightly hacky, but we want module autoloading | |
2096 | * to work for root. | |
2097 | * case: user opens device, attached -> ok | |
2098 | * case: user opens device, unattached, in_request_module=0 -> autoload | |
2099 | * case: user opens device, unattached, in_request_module=1 -> fail | |
2100 | * case: root opens device, attached -> ok | |
2101 | * case: root opens device, unattached, in_request_module=1 -> ok | |
2102 | * (typically called from modprobe) | |
2103 | * case: root opens device, unattached, in_request_module=0 -> autoload | |
2104 | * | |
2105 | * The last could be changed to "-> ok", which would deny root | |
2106 | * autoloading. | |
2107 | */ | |
2108 | mutex_lock(&dev->mutex); | |
2109 | if (dev->attached) | |
2110 | goto ok; | |
a8f80e8f | 2111 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
2112 | DPRINTK("in request module\n"); |
2113 | mutex_unlock(&dev->mutex); | |
2114 | return -ENODEV; | |
2115 | } | |
a8f80e8f | 2116 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
2117 | goto ok; |
2118 | ||
2119 | dev->in_request_module = 1; | |
2120 | ||
ed9eccbe DS |
2121 | #ifdef CONFIG_KMOD |
2122 | mutex_unlock(&dev->mutex); | |
56d92c60 | 2123 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
2124 | mutex_lock(&dev->mutex); |
2125 | #endif | |
2126 | ||
2127 | dev->in_request_module = 0; | |
2128 | ||
a8f80e8f EP |
2129 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
2130 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
2131 | mutex_unlock(&dev->mutex); |
2132 | return -ENODEV; | |
2133 | } | |
2134 | ok: | |
2135 | __module_get(THIS_MODULE); | |
2136 | ||
2137 | if (dev->attached) { | |
2138 | if (!try_module_get(dev->driver->module)) { | |
2139 | module_put(THIS_MODULE); | |
2140 | mutex_unlock(&dev->mutex); | |
2141 | return -ENOSYS; | |
2142 | } | |
2143 | } | |
2144 | ||
3c17ba07 IA |
2145 | if (dev->attached && dev->use_count == 0 && dev->open) { |
2146 | int rc = dev->open(dev); | |
2147 | if (rc < 0) { | |
2148 | module_put(dev->driver->module); | |
2149 | module_put(THIS_MODULE); | |
2150 | mutex_unlock(&dev->mutex); | |
2151 | return rc; | |
2152 | } | |
2153 | } | |
ed9eccbe DS |
2154 | |
2155 | dev->use_count++; | |
2156 | ||
a5011a26 | 2157 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2158 | |
a5011a26 | 2159 | return 0; |
ed9eccbe DS |
2160 | } |
2161 | ||
2aae0076 HS |
2162 | static int comedi_fasync(int fd, struct file *file, int on) |
2163 | { | |
2164 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
4da5fa9a | 2165 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
2aae0076 | 2166 | |
4da5fa9a | 2167 | if (!dev) |
2aae0076 HS |
2168 | return -ENODEV; |
2169 | ||
2170 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2171 | } | |
2172 | ||
a5011a26 | 2173 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2174 | { |
a5011a26 | 2175 | const unsigned minor = iminor(inode); |
4da5fa9a | 2176 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
a5011a26 | 2177 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2178 | int i; |
2179 | ||
4da5fa9a | 2180 | if (!dev) |
a5011a26 | 2181 | return -ENODEV; |
ed9eccbe | 2182 | |
a5011a26 HS |
2183 | mutex_lock(&dev->mutex); |
2184 | ||
2185 | if (dev->subdevices) { | |
2186 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2187 | s = &dev->subdevices[i]; |
a5011a26 HS |
2188 | |
2189 | if (s->busy == file) | |
2190 | do_cancel(dev, s); | |
2191 | if (s->lock == file) | |
2192 | s->lock = NULL; | |
2193 | } | |
ed9eccbe | 2194 | } |
a5011a26 HS |
2195 | if (dev->attached && dev->use_count == 1 && dev->close) |
2196 | dev->close(dev); | |
2197 | ||
2198 | module_put(THIS_MODULE); | |
2199 | if (dev->attached) | |
2200 | module_put(dev->driver->module); | |
2201 | ||
2202 | dev->use_count--; | |
2203 | ||
2204 | mutex_unlock(&dev->mutex); | |
2205 | ||
2206 | if (file->f_flags & FASYNC) | |
2207 | comedi_fasync(-1, file, 0); | |
ed9eccbe DS |
2208 | |
2209 | return 0; | |
2210 | } | |
2211 | ||
8cb8aad7 | 2212 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2213 | .owner = THIS_MODULE, |
2214 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2215 | .compat_ioctl = comedi_compat_ioctl, | |
2216 | .open = comedi_open, | |
2217 | .release = comedi_close, | |
2218 | .read = comedi_read, | |
2219 | .write = comedi_write, | |
2220 | .mmap = comedi_mmap, | |
2221 | .poll = comedi_poll, | |
2222 | .fasync = comedi_fasync, | |
2223 | .llseek = noop_llseek, | |
2224 | }; | |
2225 | ||
8cb8aad7 | 2226 | static struct class *comedi_class; |
a5011a26 HS |
2227 | static struct cdev comedi_cdev; |
2228 | ||
a5011a26 HS |
2229 | void comedi_error(const struct comedi_device *dev, const char *s) |
2230 | { | |
4f870fe6 | 2231 | dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s); |
ed9eccbe | 2232 | } |
a5011a26 | 2233 | EXPORT_SYMBOL(comedi_error); |
883db3d9 | 2234 | |
a5011a26 | 2235 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2236 | { |
a5011a26 HS |
2237 | struct comedi_async *async = s->async; |
2238 | unsigned runflags = 0; | |
2239 | unsigned runflags_mask = 0; | |
883db3d9 | 2240 | |
a5011a26 | 2241 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
883db3d9 | 2242 | |
f0124630 | 2243 | if (!comedi_is_subdevice_running(s)) |
a5011a26 HS |
2244 | return; |
2245 | ||
2246 | if (s-> | |
2247 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2248 | COMEDI_CB_OVERFLOW)) { | |
2249 | runflags_mask |= SRF_RUNNING; | |
883db3d9 | 2250 | } |
a5011a26 HS |
2251 | /* remember if an error event has occurred, so an error |
2252 | * can be returned the next time the user does a read() */ | |
2253 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2254 | runflags_mask |= SRF_ERROR; | |
2255 | runflags |= SRF_ERROR; | |
883db3d9 | 2256 | } |
a5011a26 HS |
2257 | if (runflags_mask) { |
2258 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2259 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
883db3d9 FMH |
2260 | } |
2261 | ||
a5011a26 HS |
2262 | if (async->cb_mask & s->async->events) { |
2263 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
2264 | wake_up_interruptible(&async->wait_head); | |
2265 | if (s->subdev_flags & SDF_CMD_READ) | |
2266 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); | |
2267 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2268 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); | |
2269 | } else { | |
2270 | if (async->cb_func) | |
2271 | async->cb_func(s->async->events, async->cb_arg); | |
2272 | } | |
2273 | } | |
2274 | s->async->events = 0; | |
883db3d9 | 2275 | } |
a5011a26 | 2276 | EXPORT_SYMBOL(comedi_event); |
883db3d9 | 2277 | |
a5011a26 HS |
2278 | static void comedi_device_init(struct comedi_device *dev) |
2279 | { | |
bc252fd1 | 2280 | memset(dev, 0, sizeof(*dev)); |
a5011a26 HS |
2281 | spin_lock_init(&dev->spinlock); |
2282 | mutex_init(&dev->mutex); | |
2283 | dev->minor = -1; | |
2284 | } | |
883db3d9 | 2285 | |
a5011a26 | 2286 | static void comedi_device_cleanup(struct comedi_device *dev) |
883db3d9 | 2287 | { |
a5011a26 HS |
2288 | if (dev == NULL) |
2289 | return; | |
2290 | mutex_lock(&dev->mutex); | |
2291 | comedi_device_detach(dev); | |
2292 | mutex_unlock(&dev->mutex); | |
2293 | mutex_destroy(&dev->mutex); | |
2294 | } | |
2295 | ||
2296 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2297 | { | |
cd6b7636 | 2298 | struct comedi_file_info *info; |
a5011a26 HS |
2299 | struct device *csdev; |
2300 | unsigned i; | |
a5011a26 | 2301 | |
bc252fd1 | 2302 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
a5011a26 HS |
2303 | if (info == NULL) |
2304 | return -ENOMEM; | |
2305 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); | |
2306 | if (info->device == NULL) { | |
2307 | kfree(info); | |
2308 | return -ENOMEM; | |
2309 | } | |
2310 | info->hardware_device = hardware_device; | |
2311 | comedi_device_init(info->device); | |
2312 | spin_lock(&comedi_file_info_table_lock); | |
2313 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
2314 | if (comedi_file_info_table[i] == NULL) { | |
2315 | comedi_file_info_table[i] = info; | |
2316 | break; | |
2317 | } | |
2318 | } | |
2319 | spin_unlock(&comedi_file_info_table_lock); | |
2320 | if (i == COMEDI_NUM_BOARD_MINORS) { | |
2321 | comedi_device_cleanup(info->device); | |
2322 | kfree(info->device); | |
2323 | kfree(info); | |
4f870fe6 | 2324 | pr_err("comedi: error: ran out of minor numbers for board device files.\n"); |
a5011a26 HS |
2325 | return -EBUSY; |
2326 | } | |
2327 | info->device->minor = i; | |
2328 | csdev = device_create(comedi_class, hardware_device, | |
2329 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2330 | if (!IS_ERR(csdev)) | |
2331 | info->device->class_dev = csdev; | |
2332 | dev_set_drvdata(csdev, info); | |
883db3d9 | 2333 | |
a5011a26 | 2334 | return i; |
883db3d9 FMH |
2335 | } |
2336 | ||
a5011a26 | 2337 | void comedi_free_board_minor(unsigned minor) |
883db3d9 | 2338 | { |
cd6b7636 | 2339 | struct comedi_file_info *info; |
883db3d9 | 2340 | |
a5011a26 HS |
2341 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
2342 | spin_lock(&comedi_file_info_table_lock); | |
2343 | info = comedi_file_info_table[minor]; | |
2344 | comedi_file_info_table[minor] = NULL; | |
2345 | spin_unlock(&comedi_file_info_table_lock); | |
883db3d9 | 2346 | |
a5011a26 HS |
2347 | if (info) { |
2348 | struct comedi_device *dev = info->device; | |
2349 | if (dev) { | |
2350 | if (dev->class_dev) { | |
2351 | device_destroy(comedi_class, | |
2352 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
2353 | } | |
2354 | comedi_device_cleanup(dev); | |
2355 | kfree(dev); | |
2356 | } | |
2357 | kfree(info); | |
883db3d9 | 2358 | } |
883db3d9 FMH |
2359 | } |
2360 | ||
a5011a26 | 2361 | int comedi_find_board_minor(struct device *hardware_device) |
883db3d9 | 2362 | { |
a5011a26 | 2363 | int minor; |
cd6b7636 | 2364 | struct comedi_file_info *info; |
883db3d9 | 2365 | |
a5011a26 HS |
2366 | for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) { |
2367 | spin_lock(&comedi_file_info_table_lock); | |
2368 | info = comedi_file_info_table[minor]; | |
2369 | if (info && info->hardware_device == hardware_device) { | |
2370 | spin_unlock(&comedi_file_info_table_lock); | |
2371 | return minor; | |
2372 | } | |
2373 | spin_unlock(&comedi_file_info_table_lock); | |
883db3d9 | 2374 | } |
a5011a26 | 2375 | return -ENODEV; |
883db3d9 FMH |
2376 | } |
2377 | ||
a5011a26 HS |
2378 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
2379 | struct comedi_subdevice *s) | |
883db3d9 | 2380 | { |
cd6b7636 | 2381 | struct comedi_file_info *info; |
a5011a26 HS |
2382 | struct device *csdev; |
2383 | unsigned i; | |
883db3d9 | 2384 | |
71cf6d3e HS |
2385 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
2386 | if (!info) | |
a5011a26 HS |
2387 | return -ENOMEM; |
2388 | info->device = dev; | |
2389 | info->read_subdevice = s; | |
2390 | info->write_subdevice = s; | |
2391 | spin_lock(&comedi_file_info_table_lock); | |
2392 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { | |
2393 | if (comedi_file_info_table[i] == NULL) { | |
2394 | comedi_file_info_table[i] = info; | |
2395 | break; | |
2396 | } | |
2397 | } | |
2398 | spin_unlock(&comedi_file_info_table_lock); | |
2399 | if (i == COMEDI_NUM_MINORS) { | |
2400 | kfree(info); | |
4f870fe6 | 2401 | pr_err("comedi: error: ran out of minor numbers for board device files.\n"); |
a5011a26 HS |
2402 | return -EBUSY; |
2403 | } | |
2404 | s->minor = i; | |
2405 | csdev = device_create(comedi_class, dev->class_dev, | |
2406 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2407 | dev->minor, s->index); |
a5011a26 HS |
2408 | if (!IS_ERR(csdev)) |
2409 | s->class_dev = csdev; | |
2410 | dev_set_drvdata(csdev, info); | |
883db3d9 | 2411 | |
a5011a26 | 2412 | return i; |
883db3d9 FMH |
2413 | } |
2414 | ||
a5011a26 | 2415 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2416 | { |
cd6b7636 | 2417 | struct comedi_file_info *info; |
883db3d9 | 2418 | |
a5011a26 HS |
2419 | if (s == NULL) |
2420 | return; | |
2421 | if (s->minor < 0) | |
2422 | return; | |
883db3d9 | 2423 | |
a5011a26 HS |
2424 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
2425 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
883db3d9 | 2426 | |
a5011a26 HS |
2427 | spin_lock(&comedi_file_info_table_lock); |
2428 | info = comedi_file_info_table[s->minor]; | |
2429 | comedi_file_info_table[s->minor] = NULL; | |
2430 | spin_unlock(&comedi_file_info_table_lock); | |
883db3d9 | 2431 | |
a5011a26 HS |
2432 | if (s->class_dev) { |
2433 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2434 | s->class_dev = NULL; | |
883db3d9 | 2435 | } |
a5011a26 | 2436 | kfree(info); |
883db3d9 | 2437 | } |
a5787824 | 2438 | |
76cca89f HS |
2439 | static void comedi_cleanup_legacy_minors(void) |
2440 | { | |
2441 | unsigned i; | |
2442 | ||
2443 | for (i = 0; i < comedi_num_legacy_minors; i++) | |
2444 | comedi_free_board_minor(i); | |
2445 | } | |
2446 | ||
91fa0b0c HS |
2447 | static int __init comedi_init(void) |
2448 | { | |
2449 | int i; | |
2450 | int retval; | |
2451 | ||
2452 | pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n"); | |
2453 | ||
2454 | if (comedi_num_legacy_minors < 0 || | |
2455 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
2456 | pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", | |
2457 | COMEDI_NUM_BOARD_MINORS); | |
2458 | return -EINVAL; | |
2459 | } | |
2460 | ||
2461 | /* | |
2462 | * comedi is unusable if both comedi_autoconfig and | |
2463 | * comedi_num_legacy_minors are zero, so we might as well adjust the | |
2464 | * defaults in that case | |
2465 | */ | |
2466 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) | |
2467 | comedi_num_legacy_minors = 16; | |
2468 | ||
2469 | memset(comedi_file_info_table, 0, | |
2470 | sizeof(struct comedi_file_info *) * COMEDI_NUM_MINORS); | |
2471 | ||
2472 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2473 | COMEDI_NUM_MINORS, "comedi"); | |
2474 | if (retval) | |
2475 | return -EIO; | |
2476 | cdev_init(&comedi_cdev, &comedi_fops); | |
2477 | comedi_cdev.owner = THIS_MODULE; | |
2478 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2479 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
2480 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2481 | COMEDI_NUM_MINORS); | |
2482 | return -EIO; | |
2483 | } | |
2484 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2485 | if (IS_ERR(comedi_class)) { | |
2486 | pr_err("comedi: failed to create class\n"); | |
2487 | cdev_del(&comedi_cdev); | |
2488 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2489 | COMEDI_NUM_MINORS); | |
2490 | return PTR_ERR(comedi_class); | |
2491 | } | |
2492 | ||
2493 | comedi_class->dev_attrs = comedi_dev_attrs; | |
2494 | ||
2495 | /* XXX requires /proc interface */ | |
2496 | comedi_proc_init(); | |
2497 | ||
2498 | /* create devices files for legacy/manual use */ | |
2499 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
2500 | int minor; | |
2501 | minor = comedi_alloc_board_minor(NULL); | |
2502 | if (minor < 0) { | |
2503 | comedi_cleanup_legacy_minors(); | |
2504 | cdev_del(&comedi_cdev); | |
2505 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2506 | COMEDI_NUM_MINORS); | |
2507 | return minor; | |
2508 | } | |
2509 | } | |
2510 | ||
2511 | return 0; | |
2512 | } | |
2513 | module_init(comedi_init); | |
2514 | ||
2515 | static void __exit comedi_cleanup(void) | |
2516 | { | |
2517 | int i; | |
2518 | ||
2519 | comedi_cleanup_legacy_minors(); | |
2520 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) | |
2521 | BUG_ON(comedi_file_info_table[i]); | |
2522 | ||
2523 | class_destroy(comedi_class); | |
2524 | cdev_del(&comedi_cdev); | |
2525 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2526 | ||
2527 | comedi_proc_cleanup(); | |
2528 | } | |
2529 | module_exit(comedi_cleanup); | |
2530 | ||
a5787824 HS |
2531 | MODULE_AUTHOR("http://www.comedi.org"); |
2532 | MODULE_DESCRIPTION("Comedi core module"); | |
2533 | MODULE_LICENSE("GPL"); |