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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 DS |
51 | |
52 | MODULE_AUTHOR("http://www.comedi.org"); | |
53 | MODULE_DESCRIPTION("Comedi core module"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
56 | #ifdef CONFIG_COMEDI_DEBUG | |
57 | int comedi_debug; | |
18736438 | 58 | EXPORT_SYMBOL(comedi_debug); |
4d7df821 IA |
59 | module_param(comedi_debug, int, S_IRUGO | S_IWUSR); |
60 | MODULE_PARM_DESC(comedi_debug, | |
61 | "enable comedi core and driver debugging if non-zero (default 0)" | |
62 | ); | |
ed9eccbe DS |
63 | #endif |
64 | ||
90ab5ee9 | 65 | bool comedi_autoconfig = 1; |
4d7df821 IA |
66 | module_param(comedi_autoconfig, bool, S_IRUGO); |
67 | MODULE_PARM_DESC(comedi_autoconfig, | |
68 | "enable drivers to auto-configure comedi devices (default 1)"); | |
6a9d7a21 | 69 | |
92d0127c | 70 | static int comedi_num_legacy_minors; |
4d7df821 IA |
71 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
72 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
73 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
74 | ); | |
75 | ||
234bb3c6 | 76 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
77 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
78 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
79 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 80 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 81 | |
234bb3c6 IA |
82 | unsigned int comedi_default_buf_maxsize_kb |
83 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
84 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
85 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
86 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 87 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 88 | |
ed9eccbe | 89 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
476b8477 | 90 | static struct comedi_device_file_info |
0a85b6f0 | 91 | *comedi_file_info_table[COMEDI_NUM_MINORS]; |
476b8477 | 92 | |
85104e9b HS |
93 | struct comedi_device *comedi_dev_from_minor(unsigned minor) |
94 | { | |
95 | struct comedi_device_file_info *info; | |
96 | ||
97 | info = comedi_get_device_file_info(minor); | |
98 | ||
99 | return info ? info->device : NULL; | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(comedi_dev_from_minor); | |
102 | ||
43bd33f2 HS |
103 | static struct comedi_subdevice * |
104 | comedi_get_read_subdevice(const struct comedi_device_file_info *info) | |
105 | { | |
106 | if (info->read_subdevice) | |
107 | return info->read_subdevice; | |
108 | if (info->device == NULL) | |
109 | return NULL; | |
110 | return info->device->read_subdev; | |
111 | } | |
112 | ||
113 | static struct comedi_subdevice * | |
114 | comedi_get_write_subdevice(const struct comedi_device_file_info *info) | |
115 | { | |
116 | if (info->write_subdevice) | |
117 | return info->write_subdevice; | |
118 | if (info->device == NULL) | |
119 | return NULL; | |
120 | return info->device->write_subdev; | |
121 | } | |
122 | ||
883db3d9 FMH |
123 | static int resize_async_buffer(struct comedi_device *dev, |
124 | struct comedi_subdevice *s, | |
a5011a26 HS |
125 | struct comedi_async *async, unsigned new_size) |
126 | { | |
127 | int retval; | |
128 | ||
129 | if (new_size > async->max_bufsize) | |
130 | return -EPERM; | |
131 | ||
132 | if (s->busy) { | |
133 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
134 | return -EBUSY; | |
135 | } | |
136 | if (async->mmap_count) { | |
137 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
138 | return -EBUSY; | |
139 | } | |
140 | ||
141 | if (!async->prealloc_buf) | |
142 | return -EINVAL; | |
143 | ||
144 | /* make sure buffer is an integral number of pages | |
145 | * (we round up) */ | |
146 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
147 | ||
148 | retval = comedi_buf_alloc(dev, s, new_size); | |
149 | if (retval < 0) | |
150 | return retval; | |
151 | ||
152 | if (s->buf_change) { | |
153 | retval = s->buf_change(dev, s, new_size); | |
154 | if (retval < 0) | |
155 | return retval; | |
156 | } | |
157 | ||
158 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
159 | dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | /* sysfs attribute files */ | |
164 | ||
a5011a26 HS |
165 | static ssize_t show_max_read_buffer_kb(struct device *dev, |
166 | struct device_attribute *attr, char *buf) | |
167 | { | |
a5011a26 | 168 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
72fd9fac HS |
169 | struct comedi_subdevice *s = comedi_get_read_subdevice(info); |
170 | unsigned int size = 0; | |
a5011a26 HS |
171 | |
172 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
173 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
174 | size = s->async->max_bufsize / 1024; | |
a5011a26 HS |
175 | mutex_unlock(&info->device->mutex); |
176 | ||
72fd9fac | 177 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
178 | } |
179 | ||
180 | static ssize_t store_max_read_buffer_kb(struct device *dev, | |
181 | struct device_attribute *attr, | |
182 | const char *buf, size_t count) | |
183 | { | |
184 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
72fd9fac HS |
185 | struct comedi_subdevice *s = comedi_get_read_subdevice(info); |
186 | unsigned int size; | |
187 | int err; | |
188 | ||
189 | err = kstrtouint(buf, 10, &size); | |
190 | if (err) | |
191 | return err; | |
192 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 193 | return -EINVAL; |
72fd9fac | 194 | size *= 1024; |
a5011a26 HS |
195 | |
196 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
197 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
198 | s->async->max_bufsize = size; | |
199 | else | |
200 | err = -EINVAL; | |
a5011a26 HS |
201 | mutex_unlock(&info->device->mutex); |
202 | ||
72fd9fac | 203 | return err ? err : count; |
a5011a26 HS |
204 | } |
205 | ||
a5011a26 HS |
206 | static ssize_t show_read_buffer_kb(struct device *dev, |
207 | struct device_attribute *attr, char *buf) | |
208 | { | |
a5011a26 | 209 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
72fd9fac HS |
210 | struct comedi_subdevice *s = comedi_get_read_subdevice(info); |
211 | unsigned int size = 0; | |
a5011a26 HS |
212 | |
213 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
214 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
215 | size = s->async->prealloc_bufsz / 1024; | |
a5011a26 HS |
216 | mutex_unlock(&info->device->mutex); |
217 | ||
72fd9fac | 218 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
219 | } |
220 | ||
221 | static ssize_t store_read_buffer_kb(struct device *dev, | |
222 | struct device_attribute *attr, | |
223 | const char *buf, size_t count) | |
224 | { | |
225 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
72fd9fac HS |
226 | struct comedi_subdevice *s = comedi_get_read_subdevice(info); |
227 | unsigned int size; | |
228 | int err; | |
229 | ||
230 | err = kstrtouint(buf, 10, &size); | |
231 | if (err) | |
232 | return err; | |
233 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 234 | return -EINVAL; |
72fd9fac | 235 | size *= 1024; |
a5011a26 HS |
236 | |
237 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
238 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
239 | err = resize_async_buffer(info->device, s, s->async, size); | |
240 | else | |
241 | err = -EINVAL; | |
a5011a26 HS |
242 | mutex_unlock(&info->device->mutex); |
243 | ||
72fd9fac | 244 | return err ? err : count; |
a5011a26 | 245 | } |
883db3d9 | 246 | |
a5011a26 HS |
247 | static ssize_t show_max_write_buffer_kb(struct device *dev, |
248 | struct device_attribute *attr, | |
249 | char *buf) | |
250 | { | |
a5011a26 | 251 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
72fd9fac HS |
252 | struct comedi_subdevice *s = comedi_get_write_subdevice(info); |
253 | unsigned int size = 0; | |
a5011a26 HS |
254 | |
255 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
256 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
257 | size = s->async->max_bufsize / 1024; | |
a5011a26 HS |
258 | mutex_unlock(&info->device->mutex); |
259 | ||
72fd9fac | 260 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
261 | } |
262 | ||
263 | static ssize_t store_max_write_buffer_kb(struct device *dev, | |
264 | struct device_attribute *attr, | |
265 | const char *buf, size_t count) | |
266 | { | |
267 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
72fd9fac HS |
268 | struct comedi_subdevice *s = comedi_get_write_subdevice(info); |
269 | unsigned int size; | |
270 | int err; | |
271 | ||
272 | err = kstrtouint(buf, 10, &size); | |
273 | if (err) | |
274 | return err; | |
275 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 276 | return -EINVAL; |
72fd9fac | 277 | size *= 1024; |
a5011a26 HS |
278 | |
279 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
280 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
281 | s->async->max_bufsize = size; | |
282 | else | |
283 | err = -EINVAL; | |
a5011a26 HS |
284 | mutex_unlock(&info->device->mutex); |
285 | ||
72fd9fac | 286 | return err ? err : count; |
a5011a26 HS |
287 | } |
288 | ||
a5011a26 HS |
289 | static ssize_t show_write_buffer_kb(struct device *dev, |
290 | struct device_attribute *attr, char *buf) | |
291 | { | |
a5011a26 | 292 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
72fd9fac HS |
293 | struct comedi_subdevice *s = comedi_get_write_subdevice(info); |
294 | unsigned int size = 0; | |
a5011a26 HS |
295 | |
296 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
297 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
298 | size = s->async->prealloc_bufsz / 1024; | |
a5011a26 HS |
299 | mutex_unlock(&info->device->mutex); |
300 | ||
72fd9fac | 301 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
302 | } |
303 | ||
304 | static ssize_t store_write_buffer_kb(struct device *dev, | |
305 | struct device_attribute *attr, | |
306 | const char *buf, size_t count) | |
307 | { | |
308 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
72fd9fac HS |
309 | struct comedi_subdevice *s = comedi_get_write_subdevice(info); |
310 | unsigned int size; | |
311 | int err; | |
312 | ||
313 | err = kstrtouint(buf, 10, &size); | |
314 | if (err) | |
315 | return err; | |
316 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 317 | return -EINVAL; |
72fd9fac | 318 | size *= 1024; |
a5011a26 HS |
319 | |
320 | mutex_lock(&info->device->mutex); | |
72fd9fac HS |
321 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
322 | err = resize_async_buffer(info->device, s, s->async, size); | |
323 | else | |
324 | err = -EINVAL; | |
a5011a26 HS |
325 | mutex_unlock(&info->device->mutex); |
326 | ||
72fd9fac | 327 | return err ? err : count; |
a5011a26 HS |
328 | } |
329 | ||
fb60367d HS |
330 | static struct device_attribute comedi_dev_attrs[] = { |
331 | __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, | |
332 | show_max_read_buffer_kb, store_max_read_buffer_kb), | |
333 | __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
334 | show_read_buffer_kb, store_read_buffer_kb), | |
335 | __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, | |
336 | show_max_write_buffer_kb, store_max_write_buffer_kb), | |
337 | __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
338 | show_write_buffer_kb, store_write_buffer_kb), | |
339 | __ATTR_NULL | |
a5011a26 | 340 | }; |
ed9eccbe | 341 | |
2aae0076 HS |
342 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
343 | unsigned mask, unsigned bits) | |
344 | { | |
345 | unsigned long flags; | |
346 | ||
347 | spin_lock_irqsave(&s->spin_lock, flags); | |
348 | s->runflags &= ~mask; | |
349 | s->runflags |= (bits & mask); | |
350 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
351 | } | |
352 | ||
353 | /* | |
354 | This function restores a subdevice to an idle state. | |
355 | */ | |
356 | static void do_become_nonbusy(struct comedi_device *dev, | |
357 | struct comedi_subdevice *s) | |
358 | { | |
359 | struct comedi_async *async = s->async; | |
360 | ||
361 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
362 | if (async) { | |
363 | comedi_reset_async_buf(async); | |
364 | async->inttrig = NULL; | |
365 | kfree(async->cmd.chanlist); | |
366 | async->cmd.chanlist = NULL; | |
367 | } else { | |
368 | dev_err(dev->class_dev, | |
369 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
370 | } | |
371 | ||
372 | s->busy = NULL; | |
373 | } | |
374 | ||
375 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
376 | { | |
377 | int ret = 0; | |
378 | ||
379 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) | |
380 | ret = s->cancel(dev, s); | |
381 | ||
382 | do_become_nonbusy(dev, s); | |
383 | ||
384 | return ret; | |
385 | } | |
386 | ||
387 | static int is_device_busy(struct comedi_device *dev) | |
388 | { | |
389 | struct comedi_subdevice *s; | |
390 | int i; | |
391 | ||
392 | if (!dev->attached) | |
393 | return 0; | |
394 | ||
395 | for (i = 0; i < dev->n_subdevices; i++) { | |
396 | s = &dev->subdevices[i]; | |
397 | if (s->busy) | |
398 | return 1; | |
399 | if (s->async && s->async->mmap_count) | |
400 | return 1; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
ed9eccbe DS |
406 | /* |
407 | COMEDI_DEVCONFIG | |
408 | device config ioctl | |
409 | ||
410 | arg: | |
411 | pointer to devconfig structure | |
412 | ||
413 | reads: | |
414 | devconfig structure at arg | |
415 | ||
416 | writes: | |
417 | none | |
418 | */ | |
0a85b6f0 | 419 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 420 | struct comedi_devconfig __user *arg) |
ed9eccbe | 421 | { |
0707bb04 | 422 | struct comedi_devconfig it; |
ed9eccbe DS |
423 | int ret; |
424 | unsigned char *aux_data = NULL; | |
425 | int aux_len; | |
426 | ||
427 | if (!capable(CAP_SYS_ADMIN)) | |
428 | return -EPERM; | |
429 | ||
430 | if (arg == NULL) { | |
431 | if (is_device_busy(dev)) | |
432 | return -EBUSY; | |
476b8477 | 433 | if (dev->attached) { |
ed9eccbe DS |
434 | struct module *driver_module = dev->driver->module; |
435 | comedi_device_detach(dev); | |
436 | module_put(driver_module); | |
437 | } | |
438 | return 0; | |
439 | } | |
440 | ||
0707bb04 | 441 | if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) |
ed9eccbe DS |
442 | return -EFAULT; |
443 | ||
444 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
445 | ||
446 | if (comedi_aux_data(it.options, 0) && | |
476b8477 | 447 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
ed9eccbe DS |
448 | int bit_shift; |
449 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; | |
450 | if (aux_len < 0) | |
451 | return -EFAULT; | |
452 | ||
453 | aux_data = vmalloc(aux_len); | |
454 | if (!aux_data) | |
455 | return -ENOMEM; | |
456 | ||
457 | if (copy_from_user(aux_data, | |
dc881f29 IA |
458 | (unsigned char __user * |
459 | )comedi_aux_data(it.options, 0), aux_len)) { | |
ed9eccbe DS |
460 | vfree(aux_data); |
461 | return -EFAULT; | |
462 | } | |
463 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = | |
476b8477 | 464 | (unsigned long)aux_data; |
ed9eccbe DS |
465 | if (sizeof(void *) > sizeof(int)) { |
466 | bit_shift = sizeof(int) * 8; | |
467 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = | |
476b8477 | 468 | ((unsigned long)aux_data) >> bit_shift; |
ed9eccbe DS |
469 | } else |
470 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; | |
471 | } | |
472 | ||
473 | ret = comedi_device_attach(dev, &it); | |
476b8477 GKH |
474 | if (ret == 0) { |
475 | if (!try_module_get(dev->driver->module)) { | |
ed9eccbe | 476 | comedi_device_detach(dev); |
abae41e6 | 477 | ret = -ENOSYS; |
ed9eccbe DS |
478 | } |
479 | } | |
480 | ||
481 | if (aux_data) | |
482 | vfree(aux_data); | |
483 | ||
484 | return ret; | |
485 | } | |
486 | ||
487 | /* | |
488 | COMEDI_BUFCONFIG | |
489 | buffer configuration ioctl | |
490 | ||
491 | arg: | |
492 | pointer to bufconfig structure | |
493 | ||
494 | reads: | |
495 | bufconfig at arg | |
496 | ||
497 | writes: | |
498 | modified bufconfig at arg | |
499 | ||
500 | */ | |
92d0127c GKH |
501 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
502 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 503 | { |
be6aba4a | 504 | struct comedi_bufconfig bc; |
d163679c | 505 | struct comedi_async *async; |
34c43922 | 506 | struct comedi_subdevice *s; |
883db3d9 | 507 | int retval = 0; |
ed9eccbe | 508 | |
be6aba4a | 509 | if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
510 | return -EFAULT; |
511 | ||
512 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
513 | return -EINVAL; | |
514 | ||
b077f2cd | 515 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
516 | async = s->async; |
517 | ||
518 | if (!async) { | |
519 | DPRINTK("subdevice does not have async capability\n"); | |
520 | bc.size = 0; | |
521 | bc.maximum_size = 0; | |
522 | goto copyback; | |
523 | } | |
524 | ||
525 | if (bc.maximum_size) { | |
526 | if (!capable(CAP_SYS_ADMIN)) | |
527 | return -EPERM; | |
528 | ||
529 | async->max_bufsize = bc.maximum_size; | |
530 | } | |
531 | ||
532 | if (bc.size) { | |
883db3d9 FMH |
533 | retval = resize_async_buffer(dev, s, async, bc.size); |
534 | if (retval < 0) | |
535 | return retval; | |
ed9eccbe DS |
536 | } |
537 | ||
538 | bc.size = async->prealloc_bufsz; | |
539 | bc.maximum_size = async->max_bufsize; | |
540 | ||
476b8477 | 541 | copyback: |
be6aba4a | 542 | if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
543 | return -EFAULT; |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | /* | |
549 | COMEDI_DEVINFO | |
550 | device info ioctl | |
551 | ||
552 | arg: | |
553 | pointer to devinfo structure | |
554 | ||
555 | reads: | |
556 | none | |
557 | ||
558 | writes: | |
559 | devinfo structure | |
560 | ||
561 | */ | |
0a85b6f0 | 562 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
563 | struct comedi_devinfo __user *arg, |
564 | struct file *file) | |
ed9eccbe | 565 | { |
063db04b | 566 | struct comedi_devinfo devinfo; |
ed9eccbe | 567 | const unsigned minor = iminor(file->f_dentry->d_inode); |
476b8477 GKH |
568 | struct comedi_device_file_info *dev_file_info = |
569 | comedi_get_device_file_info(minor); | |
34c43922 | 570 | struct comedi_subdevice *read_subdev = |
476b8477 | 571 | comedi_get_read_subdevice(dev_file_info); |
34c43922 | 572 | struct comedi_subdevice *write_subdev = |
476b8477 | 573 | comedi_get_write_subdevice(dev_file_info); |
ed9eccbe DS |
574 | |
575 | memset(&devinfo, 0, sizeof(devinfo)); | |
576 | ||
577 | /* fill devinfo structure */ | |
578 | devinfo.version_code = COMEDI_VERSION_CODE; | |
579 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
580 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
581 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 582 | |
476b8477 | 583 | if (read_subdev) |
ed9eccbe | 584 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
476b8477 | 585 | else |
ed9eccbe | 586 | devinfo.read_subdevice = -1; |
476b8477 GKH |
587 | |
588 | if (write_subdev) | |
ed9eccbe | 589 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
476b8477 | 590 | else |
ed9eccbe | 591 | devinfo.write_subdevice = -1; |
ed9eccbe | 592 | |
063db04b | 593 | if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) |
ed9eccbe DS |
594 | return -EFAULT; |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | /* | |
600 | COMEDI_SUBDINFO | |
601 | subdevice info ioctl | |
602 | ||
603 | arg: | |
604 | pointer to array of subdevice info structures | |
605 | ||
606 | reads: | |
607 | none | |
608 | ||
609 | writes: | |
610 | array of subdevice info structures at arg | |
611 | ||
612 | */ | |
0a85b6f0 | 613 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 614 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
615 | { |
616 | int ret, i; | |
bd52efbb | 617 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 618 | struct comedi_subdevice *s; |
ed9eccbe | 619 | |
0a85b6f0 MT |
620 | tmp = |
621 | kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), | |
622 | GFP_KERNEL); | |
ed9eccbe DS |
623 | if (!tmp) |
624 | return -ENOMEM; | |
625 | ||
626 | /* fill subdinfo structs */ | |
627 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 628 | s = &dev->subdevices[i]; |
ed9eccbe DS |
629 | us = tmp + i; |
630 | ||
631 | us->type = s->type; | |
632 | us->n_chan = s->n_chan; | |
633 | us->subd_flags = s->subdev_flags; | |
634 | if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) | |
635 | us->subd_flags |= SDF_RUNNING; | |
636 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
637 | us->timer_type = TIMER_nanosec; | |
638 | us->len_chanlist = s->len_chanlist; | |
639 | us->maxdata = s->maxdata; | |
640 | if (s->range_table) { | |
641 | us->range_type = | |
476b8477 | 642 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
643 | } else { |
644 | us->range_type = 0; /* XXX */ | |
645 | } | |
646 | us->flags = s->flags; | |
647 | ||
648 | if (s->busy) | |
649 | us->subd_flags |= SDF_BUSY; | |
650 | if (s->busy == file) | |
651 | us->subd_flags |= SDF_BUSY_OWNER; | |
652 | if (s->lock) | |
653 | us->subd_flags |= SDF_LOCKED; | |
654 | if (s->lock == file) | |
655 | us->subd_flags |= SDF_LOCK_OWNER; | |
656 | if (!s->maxdata && s->maxdata_list) | |
657 | us->subd_flags |= SDF_MAXDATA; | |
658 | if (s->flaglist) | |
659 | us->subd_flags |= SDF_FLAGS; | |
660 | if (s->range_table_list) | |
661 | us->subd_flags |= SDF_RANGETYPE; | |
662 | if (s->do_cmd) | |
663 | us->subd_flags |= SDF_CMD; | |
664 | ||
665 | if (s->insn_bits != &insn_inval) | |
666 | us->insn_bits_support = COMEDI_SUPPORTED; | |
667 | else | |
668 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
669 | ||
670 | us->settling_time_0 = s->settling_time_0; | |
671 | } | |
672 | ||
673 | ret = copy_to_user(arg, tmp, | |
bd52efbb | 674 | dev->n_subdevices * sizeof(struct comedi_subdinfo)); |
ed9eccbe DS |
675 | |
676 | kfree(tmp); | |
677 | ||
678 | return ret ? -EFAULT : 0; | |
679 | } | |
680 | ||
681 | /* | |
682 | COMEDI_CHANINFO | |
683 | subdevice info ioctl | |
684 | ||
685 | arg: | |
686 | pointer to chaninfo structure | |
687 | ||
688 | reads: | |
689 | chaninfo structure at arg | |
690 | ||
691 | writes: | |
692 | arrays at elements of chaninfo structure | |
693 | ||
694 | */ | |
0a85b6f0 | 695 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 696 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 697 | { |
34c43922 | 698 | struct comedi_subdevice *s; |
a18b416d | 699 | struct comedi_chaninfo it; |
ed9eccbe | 700 | |
a18b416d | 701 | if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) |
ed9eccbe DS |
702 | return -EFAULT; |
703 | ||
704 | if (it.subdev >= dev->n_subdevices) | |
705 | return -EINVAL; | |
b077f2cd | 706 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
707 | |
708 | if (it.maxdata_list) { | |
709 | if (s->maxdata || !s->maxdata_list) | |
710 | return -EINVAL; | |
711 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 712 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
713 | return -EFAULT; |
714 | } | |
715 | ||
716 | if (it.flaglist) { | |
717 | if (!s->flaglist) | |
718 | return -EINVAL; | |
719 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 720 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
721 | return -EFAULT; |
722 | } | |
723 | ||
724 | if (it.rangelist) { | |
725 | int i; | |
726 | ||
727 | if (!s->range_table_list) | |
728 | return -EINVAL; | |
729 | for (i = 0; i < s->n_chan; i++) { | |
730 | int x; | |
731 | ||
732 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 733 | (s->range_table_list[i]->length); |
81604d43 VK |
734 | if (put_user(x, it.rangelist + i)) |
735 | return -EFAULT; | |
ed9eccbe | 736 | } |
476b8477 GKH |
737 | #if 0 |
738 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 739 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
740 | return -EFAULT; |
741 | #endif | |
ed9eccbe DS |
742 | } |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | /* | |
748 | COMEDI_BUFINFO | |
749 | buffer information ioctl | |
750 | ||
751 | arg: | |
752 | pointer to bufinfo structure | |
753 | ||
754 | reads: | |
755 | bufinfo at arg | |
756 | ||
757 | writes: | |
758 | modified bufinfo at arg | |
759 | ||
760 | */ | |
92d0127c | 761 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 762 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 763 | { |
9aa5339a | 764 | struct comedi_bufinfo bi; |
34c43922 | 765 | struct comedi_subdevice *s; |
d163679c | 766 | struct comedi_async *async; |
ed9eccbe | 767 | |
9aa5339a | 768 | if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
769 | return -EFAULT; |
770 | ||
771 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
772 | return -EINVAL; | |
773 | ||
b077f2cd | 774 | s = &dev->subdevices[bi.subdevice]; |
53fa827e IA |
775 | |
776 | if (s->lock && s->lock != file) | |
777 | return -EACCES; | |
778 | ||
ed9eccbe DS |
779 | async = s->async; |
780 | ||
781 | if (!async) { | |
782 | DPRINTK("subdevice does not have async capability\n"); | |
783 | bi.buf_write_ptr = 0; | |
784 | bi.buf_read_ptr = 0; | |
785 | bi.buf_write_count = 0; | |
786 | bi.buf_read_count = 0; | |
4772c018 IA |
787 | bi.bytes_read = 0; |
788 | bi.bytes_written = 0; | |
ed9eccbe DS |
789 | goto copyback; |
790 | } | |
53fa827e IA |
791 | if (!s->busy) { |
792 | bi.bytes_read = 0; | |
793 | bi.bytes_written = 0; | |
794 | goto copyback_position; | |
795 | } | |
796 | if (s->busy != file) | |
797 | return -EACCES; | |
ed9eccbe DS |
798 | |
799 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
800 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
801 | comedi_buf_read_free(async, bi.bytes_read); | |
802 | ||
803 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | | |
476b8477 GKH |
804 | SRF_RUNNING)) |
805 | && async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
806 | do_become_nonbusy(dev, s); |
807 | } | |
808 | } | |
809 | ||
810 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
811 | bi.bytes_written = | |
476b8477 | 812 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
813 | comedi_buf_write_free(async, bi.bytes_written); |
814 | } | |
815 | ||
53fa827e | 816 | copyback_position: |
ed9eccbe DS |
817 | bi.buf_write_count = async->buf_write_count; |
818 | bi.buf_write_ptr = async->buf_write_ptr; | |
819 | bi.buf_read_count = async->buf_read_count; | |
820 | bi.buf_read_ptr = async->buf_read_ptr; | |
821 | ||
476b8477 | 822 | copyback: |
9aa5339a | 823 | if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
824 | return -EFAULT; |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
0a85b6f0 MT |
829 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
830 | unsigned int *data, void *file); | |
ed9eccbe | 831 | /* |
20617f22 PDP |
832 | * COMEDI_INSNLIST |
833 | * synchronous instructions | |
ed9eccbe | 834 | * |
20617f22 PDP |
835 | * arg: |
836 | * pointer to sync cmd structure | |
ed9eccbe | 837 | * |
20617f22 PDP |
838 | * reads: |
839 | * sync cmd struct at arg | |
840 | * instruction list | |
841 | * data (for writes) | |
ed9eccbe | 842 | * |
20617f22 PDP |
843 | * writes: |
844 | * data (for reads) | |
ed9eccbe DS |
845 | */ |
846 | /* arbitrary limits */ | |
847 | #define MAX_SAMPLES 256 | |
92d0127c GKH |
848 | static int do_insnlist_ioctl(struct comedi_device *dev, |
849 | struct comedi_insnlist __user *arg, void *file) | |
ed9eccbe | 850 | { |
da613f4f | 851 | struct comedi_insnlist insnlist; |
90035c08 | 852 | struct comedi_insn *insns = NULL; |
790c5541 | 853 | unsigned int *data = NULL; |
ed9eccbe DS |
854 | int i = 0; |
855 | int ret = 0; | |
856 | ||
da613f4f | 857 | if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
ed9eccbe DS |
858 | return -EFAULT; |
859 | ||
790c5541 | 860 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
861 | if (!data) { |
862 | DPRINTK("kmalloc failed\n"); | |
863 | ret = -ENOMEM; | |
864 | goto error; | |
865 | } | |
866 | ||
0a85b6f0 | 867 | insns = |
dfd8ee92 | 868 | kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL); |
ed9eccbe DS |
869 | if (!insns) { |
870 | DPRINTK("kmalloc failed\n"); | |
871 | ret = -ENOMEM; | |
872 | goto error; | |
873 | } | |
874 | ||
875 | if (copy_from_user(insns, insnlist.insns, | |
90035c08 | 876 | sizeof(struct comedi_insn) * insnlist.n_insns)) { |
ed9eccbe DS |
877 | DPRINTK("copy_from_user failed\n"); |
878 | ret = -EFAULT; | |
879 | goto error; | |
880 | } | |
881 | ||
882 | for (i = 0; i < insnlist.n_insns; i++) { | |
883 | if (insns[i].n > MAX_SAMPLES) { | |
884 | DPRINTK("number of samples too large\n"); | |
885 | ret = -EINVAL; | |
886 | goto error; | |
887 | } | |
888 | if (insns[i].insn & INSN_MASK_WRITE) { | |
889 | if (copy_from_user(data, insns[i].data, | |
790c5541 | 890 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
891 | DPRINTK("copy_from_user failed\n"); |
892 | ret = -EFAULT; | |
893 | goto error; | |
894 | } | |
895 | } | |
896 | ret = parse_insn(dev, insns + i, data, file); | |
897 | if (ret < 0) | |
898 | goto error; | |
899 | if (insns[i].insn & INSN_MASK_READ) { | |
900 | if (copy_to_user(insns[i].data, data, | |
790c5541 | 901 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
902 | DPRINTK("copy_to_user failed\n"); |
903 | ret = -EFAULT; | |
904 | goto error; | |
905 | } | |
906 | } | |
907 | if (need_resched()) | |
908 | schedule(); | |
909 | } | |
910 | ||
476b8477 GKH |
911 | error: |
912 | kfree(insns); | |
913 | kfree(data); | |
ed9eccbe DS |
914 | |
915 | if (ret < 0) | |
916 | return ret; | |
917 | return i; | |
918 | } | |
919 | ||
0a85b6f0 MT |
920 | static int check_insn_config_length(struct comedi_insn *insn, |
921 | unsigned int *data) | |
ed9eccbe | 922 | { |
476b8477 GKH |
923 | if (insn->n < 1) |
924 | return -EINVAL; | |
ed9eccbe DS |
925 | |
926 | switch (data[0]) { | |
927 | case INSN_CONFIG_DIO_OUTPUT: | |
928 | case INSN_CONFIG_DIO_INPUT: | |
929 | case INSN_CONFIG_DISARM: | |
930 | case INSN_CONFIG_RESET: | |
931 | if (insn->n == 1) | |
932 | return 0; | |
933 | break; | |
934 | case INSN_CONFIG_ARM: | |
935 | case INSN_CONFIG_DIO_QUERY: | |
936 | case INSN_CONFIG_BLOCK_SIZE: | |
937 | case INSN_CONFIG_FILTER: | |
938 | case INSN_CONFIG_SERIAL_CLOCK: | |
939 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
940 | case INSN_CONFIG_ALT_SOURCE: | |
941 | case INSN_CONFIG_SET_COUNTER_MODE: | |
942 | case INSN_CONFIG_8254_READ_STATUS: | |
943 | case INSN_CONFIG_SET_ROUTING: | |
944 | case INSN_CONFIG_GET_ROUTING: | |
945 | case INSN_CONFIG_GET_PWM_STATUS: | |
946 | case INSN_CONFIG_PWM_SET_PERIOD: | |
947 | case INSN_CONFIG_PWM_GET_PERIOD: | |
948 | if (insn->n == 2) | |
949 | return 0; | |
950 | break; | |
951 | case INSN_CONFIG_SET_GATE_SRC: | |
952 | case INSN_CONFIG_GET_GATE_SRC: | |
953 | case INSN_CONFIG_SET_CLOCK_SRC: | |
954 | case INSN_CONFIG_GET_CLOCK_SRC: | |
955 | case INSN_CONFIG_SET_OTHER_SRC: | |
956 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
957 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
958 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
959 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
960 | if (insn->n == 3) | |
961 | return 0; | |
962 | break; | |
963 | case INSN_CONFIG_PWM_OUTPUT: | |
964 | case INSN_CONFIG_ANALOG_TRIG: | |
965 | if (insn->n == 5) | |
966 | return 0; | |
967 | break; | |
b0a2b6d8 IA |
968 | case INSN_CONFIG_DIGITAL_TRIG: |
969 | if (insn->n == 6) | |
970 | return 0; | |
971 | break; | |
0a85b6f0 MT |
972 | /* by default we allow the insn since we don't have checks for |
973 | * all possible cases yet */ | |
ed9eccbe | 974 | default: |
4f870fe6 IA |
975 | pr_warn("comedi: No check for data length of config insn id %i is implemented.\n", |
976 | data[0]); | |
977 | pr_warn("comedi: Add a check to %s in %s.\n", | |
978 | __func__, __FILE__); | |
979 | pr_warn("comedi: Assuming n=%i is correct.\n", insn->n); | |
ed9eccbe | 980 | return 0; |
ed9eccbe DS |
981 | } |
982 | return -EINVAL; | |
983 | } | |
984 | ||
0a85b6f0 MT |
985 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
986 | unsigned int *data, void *file) | |
ed9eccbe | 987 | { |
34c43922 | 988 | struct comedi_subdevice *s; |
ed9eccbe DS |
989 | int ret = 0; |
990 | int i; | |
991 | ||
992 | if (insn->insn & INSN_MASK_SPECIAL) { | |
993 | /* a non-subdevice instruction */ | |
994 | ||
995 | switch (insn->insn) { | |
996 | case INSN_GTOD: | |
997 | { | |
998 | struct timeval tv; | |
999 | ||
1000 | if (insn->n != 2) { | |
1001 | ret = -EINVAL; | |
1002 | break; | |
1003 | } | |
1004 | ||
1005 | do_gettimeofday(&tv); | |
1006 | data[0] = tv.tv_sec; | |
1007 | data[1] = tv.tv_usec; | |
1008 | ret = 2; | |
1009 | ||
1010 | break; | |
1011 | } | |
1012 | case INSN_WAIT: | |
1013 | if (insn->n != 1 || data[0] >= 100000) { | |
1014 | ret = -EINVAL; | |
1015 | break; | |
1016 | } | |
1017 | udelay(data[0] / 1000); | |
1018 | ret = 1; | |
1019 | break; | |
1020 | case INSN_INTTRIG: | |
1021 | if (insn->n != 1) { | |
1022 | ret = -EINVAL; | |
1023 | break; | |
1024 | } | |
1025 | if (insn->subdev >= dev->n_subdevices) { | |
1026 | DPRINTK("%d not usable subdevice\n", | |
1027 | insn->subdev); | |
1028 | ret = -EINVAL; | |
1029 | break; | |
1030 | } | |
b077f2cd | 1031 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1032 | if (!s->async) { |
1033 | DPRINTK("no async\n"); | |
1034 | ret = -EINVAL; | |
1035 | break; | |
1036 | } | |
1037 | if (!s->async->inttrig) { | |
1038 | DPRINTK("no inttrig\n"); | |
1039 | ret = -EAGAIN; | |
1040 | break; | |
1041 | } | |
5d06e3df | 1042 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1043 | if (ret >= 0) |
1044 | ret = 1; | |
1045 | break; | |
1046 | default: | |
1047 | DPRINTK("invalid insn\n"); | |
1048 | ret = -EINVAL; | |
1049 | break; | |
1050 | } | |
1051 | } else { | |
1052 | /* a subdevice instruction */ | |
790c5541 | 1053 | unsigned int maxdata; |
ed9eccbe DS |
1054 | |
1055 | if (insn->subdev >= dev->n_subdevices) { | |
1056 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
1057 | ret = -EINVAL; | |
1058 | goto out; | |
1059 | } | |
b077f2cd | 1060 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1061 | |
1062 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1063 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
1064 | ret = -EIO; | |
1065 | goto out; | |
1066 | } | |
1067 | ||
1068 | /* are we locked? (ioctl lock) */ | |
1069 | if (s->lock && s->lock != file) { | |
1070 | DPRINTK("device locked\n"); | |
1071 | ret = -EACCES; | |
1072 | goto out; | |
1073 | } | |
1074 | ||
0fd0ca75 | 1075 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1076 | if (ret < 0) { |
ed9eccbe DS |
1077 | ret = -EINVAL; |
1078 | DPRINTK("bad chanspec\n"); | |
1079 | goto out; | |
1080 | } | |
1081 | ||
1082 | if (s->busy) { | |
1083 | ret = -EBUSY; | |
1084 | goto out; | |
1085 | } | |
1086 | /* This looks arbitrary. It is. */ | |
1087 | s->busy = &parse_insn; | |
1088 | switch (insn->insn) { | |
1089 | case INSN_READ: | |
1090 | ret = s->insn_read(dev, s, insn, data); | |
1091 | break; | |
1092 | case INSN_WRITE: | |
1093 | maxdata = s->maxdata_list | |
476b8477 GKH |
1094 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1095 | : s->maxdata; | |
ed9eccbe DS |
1096 | for (i = 0; i < insn->n; ++i) { |
1097 | if (data[i] > maxdata) { | |
1098 | ret = -EINVAL; | |
1099 | DPRINTK("bad data value(s)\n"); | |
1100 | break; | |
1101 | } | |
1102 | } | |
1103 | if (ret == 0) | |
1104 | ret = s->insn_write(dev, s, insn, data); | |
1105 | break; | |
1106 | case INSN_BITS: | |
1107 | if (insn->n != 2) { | |
1108 | ret = -EINVAL; | |
2f644ccf IA |
1109 | } else { |
1110 | /* Most drivers ignore the base channel in | |
1111 | * insn->chanspec. Fix this here if | |
1112 | * the subdevice has <= 32 channels. */ | |
1113 | unsigned int shift; | |
1114 | unsigned int orig_mask; | |
1115 | ||
1116 | orig_mask = data[0]; | |
1117 | if (s->n_chan <= 32) { | |
1118 | shift = CR_CHAN(insn->chanspec); | |
1119 | if (shift > 0) { | |
1120 | insn->chanspec = 0; | |
1121 | data[0] <<= shift; | |
1122 | data[1] <<= shift; | |
1123 | } | |
1124 | } else | |
1125 | shift = 0; | |
1126 | ret = s->insn_bits(dev, s, insn, data); | |
1127 | data[0] = orig_mask; | |
1128 | if (shift > 0) | |
1129 | data[1] >>= shift; | |
ed9eccbe | 1130 | } |
ed9eccbe DS |
1131 | break; |
1132 | case INSN_CONFIG: | |
1133 | ret = check_insn_config_length(insn, data); | |
1134 | if (ret) | |
1135 | break; | |
1136 | ret = s->insn_config(dev, s, insn, data); | |
1137 | break; | |
1138 | default: | |
1139 | ret = -EINVAL; | |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | s->busy = NULL; | |
1144 | } | |
1145 | ||
476b8477 | 1146 | out: |
ed9eccbe DS |
1147 | return ret; |
1148 | } | |
1149 | ||
1150 | /* | |
20617f22 PDP |
1151 | * COMEDI_INSN |
1152 | * synchronous instructions | |
ed9eccbe | 1153 | * |
20617f22 PDP |
1154 | * arg: |
1155 | * pointer to insn | |
ed9eccbe | 1156 | * |
20617f22 PDP |
1157 | * reads: |
1158 | * struct comedi_insn struct at arg | |
1159 | * data (for writes) | |
ed9eccbe | 1160 | * |
20617f22 PDP |
1161 | * writes: |
1162 | * data (for reads) | |
ed9eccbe | 1163 | */ |
92d0127c GKH |
1164 | static int do_insn_ioctl(struct comedi_device *dev, |
1165 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1166 | { |
90035c08 | 1167 | struct comedi_insn insn; |
790c5541 | 1168 | unsigned int *data = NULL; |
ed9eccbe DS |
1169 | int ret = 0; |
1170 | ||
790c5541 | 1171 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
1172 | if (!data) { |
1173 | ret = -ENOMEM; | |
1174 | goto error; | |
1175 | } | |
1176 | ||
90035c08 | 1177 | if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
ed9eccbe DS |
1178 | ret = -EFAULT; |
1179 | goto error; | |
1180 | } | |
1181 | ||
1182 | /* This is where the behavior of insn and insnlist deviate. */ | |
1183 | if (insn.n > MAX_SAMPLES) | |
1184 | insn.n = MAX_SAMPLES; | |
1185 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1186 | if (copy_from_user(data, |
1187 | insn.data, | |
1188 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1189 | ret = -EFAULT; |
1190 | goto error; | |
1191 | } | |
1192 | } | |
1193 | ret = parse_insn(dev, &insn, data, file); | |
1194 | if (ret < 0) | |
1195 | goto error; | |
1196 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1197 | if (copy_to_user(insn.data, |
1198 | data, | |
1199 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1200 | ret = -EFAULT; |
1201 | goto error; | |
1202 | } | |
1203 | } | |
1204 | ret = insn.n; | |
1205 | ||
476b8477 GKH |
1206 | error: |
1207 | kfree(data); | |
ed9eccbe DS |
1208 | |
1209 | return ret; | |
1210 | } | |
1211 | ||
92d0127c | 1212 | static int do_cmd_ioctl(struct comedi_device *dev, |
cbe01f72 | 1213 | struct comedi_cmd __user *arg, void *file) |
ed9eccbe | 1214 | { |
88bc0574 | 1215 | struct comedi_cmd cmd; |
34c43922 | 1216 | struct comedi_subdevice *s; |
d163679c | 1217 | struct comedi_async *async; |
ed9eccbe | 1218 | int ret = 0; |
95bc359f | 1219 | unsigned int __user *user_chanlist; |
ed9eccbe | 1220 | |
88bc0574 | 1221 | if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1222 | DPRINTK("bad cmd address\n"); |
1223 | return -EFAULT; | |
1224 | } | |
476b8477 | 1225 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1226 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1227 | |
88bc0574 HS |
1228 | if (cmd.subdev >= dev->n_subdevices) { |
1229 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1230 | return -ENODEV; |
1231 | } | |
1232 | ||
88bc0574 | 1233 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe DS |
1234 | async = s->async; |
1235 | ||
1236 | if (s->type == COMEDI_SUBD_UNUSED) { | |
88bc0574 | 1237 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1238 | return -EIO; |
1239 | } | |
1240 | ||
1241 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1242 | DPRINTK("subdevice %i does not support commands\n", | |
88bc0574 | 1243 | cmd.subdev); |
ed9eccbe DS |
1244 | return -EIO; |
1245 | } | |
1246 | ||
1247 | /* are we locked? (ioctl lock) */ | |
1248 | if (s->lock && s->lock != file) { | |
1249 | DPRINTK("subdevice locked\n"); | |
1250 | return -EACCES; | |
1251 | } | |
1252 | ||
1253 | /* are we busy? */ | |
1254 | if (s->busy) { | |
1255 | DPRINTK("subdevice busy\n"); | |
1256 | return -EBUSY; | |
1257 | } | |
1258 | s->busy = file; | |
1259 | ||
1260 | /* make sure channel/gain list isn't too long */ | |
88bc0574 | 1261 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1262 | DPRINTK("channel/gain list too long %u > %d\n", |
88bc0574 | 1263 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1264 | ret = -EINVAL; |
1265 | goto cleanup; | |
1266 | } | |
1267 | ||
1268 | /* make sure channel/gain list isn't too short */ | |
88bc0574 | 1269 | if (cmd.chanlist_len < 1) { |
ed9eccbe | 1270 | DPRINTK("channel/gain list too short %u < 1\n", |
88bc0574 | 1271 | cmd.chanlist_len); |
ed9eccbe DS |
1272 | ret = -EINVAL; |
1273 | goto cleanup; | |
1274 | } | |
1275 | ||
88bc0574 | 1276 | async->cmd = cmd; |
ed9eccbe DS |
1277 | async->cmd.data = NULL; |
1278 | /* load channel/gain list */ | |
1279 | async->cmd.chanlist = | |
476b8477 | 1280 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1281 | if (!async->cmd.chanlist) { |
1282 | DPRINTK("allocation failed\n"); | |
1283 | ret = -ENOMEM; | |
1284 | goto cleanup; | |
1285 | } | |
1286 | ||
95bc359f | 1287 | if (copy_from_user(async->cmd.chanlist, user_chanlist, |
476b8477 | 1288 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1289 | DPRINTK("fault reading chanlist\n"); |
1290 | ret = -EFAULT; | |
1291 | goto cleanup; | |
1292 | } | |
1293 | ||
1294 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1295 | ret = comedi_check_chanlist(s, |
1296 | async->cmd.chanlist_len, | |
1297 | async->cmd.chanlist); | |
476b8477 | 1298 | if (ret < 0) { |
ed9eccbe DS |
1299 | DPRINTK("bad chanlist\n"); |
1300 | goto cleanup; | |
1301 | } | |
1302 | ||
1303 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1304 | ||
1305 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1306 | DPRINTK("test returned %d\n", ret); | |
88bc0574 | 1307 | cmd = async->cmd; |
476b8477 | 1308 | /* restore chanlist pointer before copying back */ |
95bc359f | 1309 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 HS |
1310 | cmd.data = NULL; |
1311 | if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) { | |
ed9eccbe DS |
1312 | DPRINTK("fault writing cmd\n"); |
1313 | ret = -EFAULT; | |
1314 | goto cleanup; | |
1315 | } | |
1316 | ret = -EAGAIN; | |
1317 | goto cleanup; | |
1318 | } | |
1319 | ||
1320 | if (!async->prealloc_bufsz) { | |
1321 | ret = -ENOMEM; | |
1322 | DPRINTK("no buffer (?)\n"); | |
1323 | goto cleanup; | |
1324 | } | |
1325 | ||
1326 | comedi_reset_async_buf(async); | |
1327 | ||
1328 | async->cb_mask = | |
476b8477 GKH |
1329 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1330 | COMEDI_CB_OVERFLOW; | |
1331 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1332 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1333 | |
1334 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1335 | ||
ed9eccbe DS |
1336 | ret = s->do_cmd(dev, s); |
1337 | if (ret == 0) | |
1338 | return 0; | |
1339 | ||
476b8477 | 1340 | cleanup: |
ed9eccbe DS |
1341 | do_become_nonbusy(dev, s); |
1342 | ||
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | COMEDI_CMDTEST | |
1348 | command testing ioctl | |
1349 | ||
1350 | arg: | |
1351 | pointer to cmd structure | |
1352 | ||
1353 | reads: | |
1354 | cmd structure at arg | |
1355 | channel/range list | |
1356 | ||
1357 | writes: | |
1358 | modified cmd structure at arg | |
1359 | ||
1360 | */ | |
92d0127c GKH |
1361 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1362 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1363 | { |
f8348677 | 1364 | struct comedi_cmd cmd; |
34c43922 | 1365 | struct comedi_subdevice *s; |
ed9eccbe DS |
1366 | int ret = 0; |
1367 | unsigned int *chanlist = NULL; | |
95bc359f | 1368 | unsigned int __user *user_chanlist; |
ed9eccbe | 1369 | |
f8348677 | 1370 | if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1371 | DPRINTK("bad cmd address\n"); |
1372 | return -EFAULT; | |
1373 | } | |
476b8477 | 1374 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1375 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1376 | |
f8348677 HS |
1377 | if (cmd.subdev >= dev->n_subdevices) { |
1378 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1379 | return -ENODEV; |
1380 | } | |
1381 | ||
f8348677 | 1382 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1383 | if (s->type == COMEDI_SUBD_UNUSED) { |
f8348677 | 1384 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1385 | return -EIO; |
1386 | } | |
1387 | ||
1388 | if (!s->do_cmd || !s->do_cmdtest) { | |
1389 | DPRINTK("subdevice %i does not support commands\n", | |
f8348677 | 1390 | cmd.subdev); |
ed9eccbe DS |
1391 | return -EIO; |
1392 | } | |
1393 | ||
1394 | /* make sure channel/gain list isn't too long */ | |
f8348677 | 1395 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1396 | DPRINTK("channel/gain list too long %d > %d\n", |
f8348677 | 1397 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1398 | ret = -EINVAL; |
1399 | goto cleanup; | |
1400 | } | |
1401 | ||
1402 | /* load channel/gain list */ | |
f8348677 | 1403 | if (cmd.chanlist) { |
ed9eccbe | 1404 | chanlist = |
f8348677 | 1405 | kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1406 | if (!chanlist) { |
1407 | DPRINTK("allocation failed\n"); | |
1408 | ret = -ENOMEM; | |
1409 | goto cleanup; | |
1410 | } | |
1411 | ||
95bc359f | 1412 | if (copy_from_user(chanlist, user_chanlist, |
f8348677 | 1413 | cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1414 | DPRINTK("fault reading chanlist\n"); |
1415 | ret = -EFAULT; | |
1416 | goto cleanup; | |
1417 | } | |
1418 | ||
1419 | /* make sure each element in channel/gain list is valid */ | |
f8348677 | 1420 | ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist); |
476b8477 | 1421 | if (ret < 0) { |
ed9eccbe DS |
1422 | DPRINTK("bad chanlist\n"); |
1423 | goto cleanup; | |
1424 | } | |
1425 | ||
f8348677 | 1426 | cmd.chanlist = chanlist; |
ed9eccbe DS |
1427 | } |
1428 | ||
f8348677 | 1429 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1430 | |
476b8477 | 1431 | /* restore chanlist pointer before copying back */ |
95bc359f | 1432 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1433 | |
f8348677 | 1434 | if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1435 | DPRINTK("bad cmd address\n"); |
1436 | ret = -EFAULT; | |
1437 | goto cleanup; | |
1438 | } | |
476b8477 GKH |
1439 | cleanup: |
1440 | kfree(chanlist); | |
ed9eccbe DS |
1441 | |
1442 | return ret; | |
1443 | } | |
1444 | ||
1445 | /* | |
1446 | COMEDI_LOCK | |
1447 | lock subdevice | |
1448 | ||
1449 | arg: | |
1450 | subdevice number | |
1451 | ||
1452 | reads: | |
1453 | none | |
1454 | ||
1455 | writes: | |
1456 | none | |
1457 | ||
1458 | */ | |
1459 | ||
0a85b6f0 MT |
1460 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1461 | void *file) | |
ed9eccbe DS |
1462 | { |
1463 | int ret = 0; | |
1464 | unsigned long flags; | |
34c43922 | 1465 | struct comedi_subdevice *s; |
ed9eccbe DS |
1466 | |
1467 | if (arg >= dev->n_subdevices) | |
1468 | return -EINVAL; | |
b077f2cd | 1469 | s = &dev->subdevices[arg]; |
ed9eccbe | 1470 | |
5f74ea14 | 1471 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1472 | if (s->busy || s->lock) |
ed9eccbe | 1473 | ret = -EBUSY; |
476b8477 | 1474 | else |
ed9eccbe | 1475 | s->lock = file; |
5f74ea14 | 1476 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1477 | |
c5274ab0 | 1478 | #if 0 |
ed9eccbe DS |
1479 | if (ret < 0) |
1480 | return ret; | |
1481 | ||
ed9eccbe DS |
1482 | if (s->lock_f) |
1483 | ret = s->lock_f(dev, s); | |
1484 | #endif | |
1485 | ||
1486 | return ret; | |
1487 | } | |
1488 | ||
1489 | /* | |
1490 | COMEDI_UNLOCK | |
1491 | unlock subdevice | |
1492 | ||
1493 | arg: | |
1494 | subdevice number | |
1495 | ||
1496 | reads: | |
1497 | none | |
1498 | ||
1499 | writes: | |
1500 | none | |
1501 | ||
1502 | This function isn't protected by the semaphore, since | |
1503 | we already own the lock. | |
1504 | */ | |
0a85b6f0 MT |
1505 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1506 | void *file) | |
ed9eccbe | 1507 | { |
34c43922 | 1508 | struct comedi_subdevice *s; |
ed9eccbe DS |
1509 | |
1510 | if (arg >= dev->n_subdevices) | |
1511 | return -EINVAL; | |
b077f2cd | 1512 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1513 | |
1514 | if (s->busy) | |
1515 | return -EBUSY; | |
1516 | ||
1517 | if (s->lock && s->lock != file) | |
1518 | return -EACCES; | |
1519 | ||
1520 | if (s->lock == file) { | |
1521 | #if 0 | |
1522 | if (s->unlock) | |
1523 | s->unlock(dev, s); | |
1524 | #endif | |
1525 | ||
1526 | s->lock = NULL; | |
1527 | } | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | COMEDI_CANCEL | |
1534 | cancel acquisition ioctl | |
1535 | ||
1536 | arg: | |
1537 | subdevice number | |
1538 | ||
1539 | reads: | |
1540 | nothing | |
1541 | ||
1542 | writes: | |
1543 | nothing | |
1544 | ||
1545 | */ | |
0a85b6f0 MT |
1546 | static int do_cancel_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 | if (s->async == NULL) |
1555 | return -EINVAL; | |
1556 | ||
1557 | if (s->lock && s->lock != file) | |
1558 | return -EACCES; | |
1559 | ||
1560 | if (!s->busy) | |
1561 | return 0; | |
1562 | ||
1563 | if (s->busy != file) | |
1564 | return -EBUSY; | |
1565 | ||
1566 | return do_cancel(dev, s); | |
1567 | } | |
1568 | ||
1569 | /* | |
1570 | COMEDI_POLL ioctl | |
1571 | instructs driver to synchronize buffers | |
1572 | ||
1573 | arg: | |
1574 | subdevice number | |
1575 | ||
1576 | reads: | |
1577 | nothing | |
1578 | ||
1579 | writes: | |
1580 | nothing | |
1581 | ||
1582 | */ | |
0a85b6f0 MT |
1583 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1584 | void *file) | |
ed9eccbe | 1585 | { |
34c43922 | 1586 | struct comedi_subdevice *s; |
ed9eccbe DS |
1587 | |
1588 | if (arg >= dev->n_subdevices) | |
1589 | return -EINVAL; | |
b077f2cd | 1590 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1591 | |
1592 | if (s->lock && s->lock != file) | |
1593 | return -EACCES; | |
1594 | ||
1595 | if (!s->busy) | |
1596 | return 0; | |
1597 | ||
1598 | if (s->busy != file) | |
1599 | return -EBUSY; | |
1600 | ||
1601 | if (s->poll) | |
1602 | return s->poll(dev, s); | |
1603 | ||
1604 | return -EINVAL; | |
1605 | } | |
1606 | ||
47db6d58 HS |
1607 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1608 | unsigned long arg) | |
1609 | { | |
1610 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
4da5fa9a | 1611 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
47db6d58 HS |
1612 | int rc; |
1613 | ||
4da5fa9a | 1614 | if (!dev) |
47db6d58 | 1615 | return -ENODEV; |
47db6d58 HS |
1616 | |
1617 | mutex_lock(&dev->mutex); | |
1618 | ||
1619 | /* Device config is special, because it must work on | |
1620 | * an unconfigured device. */ | |
1621 | if (cmd == COMEDI_DEVCONFIG) { | |
1622 | rc = do_devconfig_ioctl(dev, | |
1623 | (struct comedi_devconfig __user *)arg); | |
1624 | goto done; | |
1625 | } | |
1626 | ||
1627 | if (!dev->attached) { | |
1628 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
1629 | rc = -ENODEV; | |
1630 | goto done; | |
1631 | } | |
1632 | ||
1633 | switch (cmd) { | |
1634 | case COMEDI_BUFCONFIG: | |
1635 | rc = do_bufconfig_ioctl(dev, | |
1636 | (struct comedi_bufconfig __user *)arg); | |
1637 | break; | |
1638 | case COMEDI_DEVINFO: | |
1639 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
1640 | file); | |
1641 | break; | |
1642 | case COMEDI_SUBDINFO: | |
1643 | rc = do_subdinfo_ioctl(dev, | |
1644 | (struct comedi_subdinfo __user *)arg, | |
1645 | file); | |
1646 | break; | |
1647 | case COMEDI_CHANINFO: | |
1648 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
1649 | break; | |
1650 | case COMEDI_RANGEINFO: | |
1651 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
1652 | break; | |
1653 | case COMEDI_BUFINFO: | |
1654 | rc = do_bufinfo_ioctl(dev, | |
1655 | (struct comedi_bufinfo __user *)arg, | |
1656 | file); | |
1657 | break; | |
1658 | case COMEDI_LOCK: | |
1659 | rc = do_lock_ioctl(dev, arg, file); | |
1660 | break; | |
1661 | case COMEDI_UNLOCK: | |
1662 | rc = do_unlock_ioctl(dev, arg, file); | |
1663 | break; | |
1664 | case COMEDI_CANCEL: | |
1665 | rc = do_cancel_ioctl(dev, arg, file); | |
1666 | break; | |
1667 | case COMEDI_CMD: | |
1668 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
1669 | break; | |
1670 | case COMEDI_CMDTEST: | |
1671 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
1672 | file); | |
1673 | break; | |
1674 | case COMEDI_INSNLIST: | |
1675 | rc = do_insnlist_ioctl(dev, | |
1676 | (struct comedi_insnlist __user *)arg, | |
1677 | file); | |
1678 | break; | |
1679 | case COMEDI_INSN: | |
1680 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
1681 | file); | |
1682 | break; | |
1683 | case COMEDI_POLL: | |
1684 | rc = do_poll_ioctl(dev, arg, file); | |
1685 | break; | |
1686 | default: | |
1687 | rc = -ENOTTY; | |
1688 | break; | |
1689 | } | |
1690 | ||
1691 | done: | |
1692 | mutex_unlock(&dev->mutex); | |
1693 | return rc; | |
1694 | } | |
1695 | ||
df30b21c FV |
1696 | static void comedi_vm_open(struct vm_area_struct *area) |
1697 | { | |
1698 | struct comedi_async *async; | |
1699 | struct comedi_device *dev; | |
1700 | ||
1701 | async = area->vm_private_data; | |
1702 | dev = async->subdevice->device; | |
1703 | ||
1704 | mutex_lock(&dev->mutex); | |
1705 | async->mmap_count++; | |
1706 | mutex_unlock(&dev->mutex); | |
1707 | } | |
1708 | ||
1709 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 1710 | { |
d163679c | 1711 | struct comedi_async *async; |
71b5f4f1 | 1712 | struct comedi_device *dev; |
ed9eccbe DS |
1713 | |
1714 | async = area->vm_private_data; | |
1715 | dev = async->subdevice->device; | |
1716 | ||
1717 | mutex_lock(&dev->mutex); | |
1718 | async->mmap_count--; | |
1719 | mutex_unlock(&dev->mutex); | |
1720 | } | |
1721 | ||
1722 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
1723 | .open = comedi_vm_open, |
1724 | .close = comedi_vm_close, | |
ed9eccbe DS |
1725 | }; |
1726 | ||
1727 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1728 | { | |
1729 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
d163679c | 1730 | struct comedi_async *async = NULL; |
ed9eccbe DS |
1731 | unsigned long start = vma->vm_start; |
1732 | unsigned long size; | |
1733 | int n_pages; | |
1734 | int i; | |
1735 | int retval; | |
34c43922 | 1736 | struct comedi_subdevice *s; |
3ffab428 BP |
1737 | struct comedi_device_file_info *dev_file_info; |
1738 | struct comedi_device *dev; | |
1739 | ||
1740 | dev_file_info = comedi_get_device_file_info(minor); | |
1741 | if (dev_file_info == NULL) | |
70fe742c | 1742 | return -ENODEV; |
3ffab428 BP |
1743 | dev = dev_file_info->device; |
1744 | if (dev == NULL) | |
70fe742c | 1745 | return -ENODEV; |
ed9eccbe DS |
1746 | |
1747 | mutex_lock(&dev->mutex); | |
1748 | if (!dev->attached) { | |
1749 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1750 | retval = -ENODEV; | |
1751 | goto done; | |
1752 | } | |
476b8477 | 1753 | if (vma->vm_flags & VM_WRITE) |
ed9eccbe | 1754 | s = comedi_get_write_subdevice(dev_file_info); |
476b8477 | 1755 | else |
ed9eccbe | 1756 | s = comedi_get_read_subdevice(dev_file_info); |
476b8477 | 1757 | |
ed9eccbe DS |
1758 | if (s == NULL) { |
1759 | retval = -EINVAL; | |
1760 | goto done; | |
1761 | } | |
1762 | async = s->async; | |
1763 | if (async == NULL) { | |
1764 | retval = -EINVAL; | |
1765 | goto done; | |
1766 | } | |
1767 | ||
1768 | if (vma->vm_pgoff != 0) { | |
1769 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1770 | retval = -EINVAL; | |
1771 | goto done; | |
1772 | } | |
1773 | ||
1774 | size = vma->vm_end - vma->vm_start; | |
1775 | if (size > async->prealloc_bufsz) { | |
1776 | retval = -EFAULT; | |
1777 | goto done; | |
1778 | } | |
1779 | if (size & (~PAGE_MASK)) { | |
1780 | retval = -EFAULT; | |
1781 | goto done; | |
1782 | } | |
1783 | ||
1784 | n_pages = size >> PAGE_SHIFT; | |
1785 | for (i = 0; i < n_pages; ++i) { | |
1786 | if (remap_pfn_range(vma, start, | |
0a85b6f0 MT |
1787 | page_to_pfn(virt_to_page |
1788 | (async->buf_page_list | |
1789 | [i].virt_addr)), PAGE_SIZE, | |
1790 | PAGE_SHARED)) { | |
ed9eccbe DS |
1791 | retval = -EAGAIN; |
1792 | goto done; | |
1793 | } | |
1794 | start += PAGE_SIZE; | |
1795 | } | |
1796 | ||
1797 | vma->vm_ops = &comedi_vm_ops; | |
1798 | vma->vm_private_data = async; | |
1799 | ||
1800 | async->mmap_count++; | |
1801 | ||
1802 | retval = 0; | |
476b8477 | 1803 | done: |
ed9eccbe DS |
1804 | mutex_unlock(&dev->mutex); |
1805 | return retval; | |
1806 | } | |
1807 | ||
1ae5062a | 1808 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1809 | { |
1810 | unsigned int mask = 0; | |
1811 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
34c43922 BP |
1812 | struct comedi_subdevice *read_subdev; |
1813 | struct comedi_subdevice *write_subdev; | |
3ffab428 BP |
1814 | struct comedi_device_file_info *dev_file_info; |
1815 | struct comedi_device *dev; | |
1816 | dev_file_info = comedi_get_device_file_info(minor); | |
1817 | ||
1818 | if (dev_file_info == NULL) | |
70fe742c | 1819 | return -ENODEV; |
3ffab428 BP |
1820 | dev = dev_file_info->device; |
1821 | if (dev == NULL) | |
70fe742c | 1822 | return -ENODEV; |
ed9eccbe DS |
1823 | |
1824 | mutex_lock(&dev->mutex); | |
1825 | if (!dev->attached) { | |
1826 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1827 | mutex_unlock(&dev->mutex); | |
1828 | return 0; | |
1829 | } | |
1830 | ||
1831 | mask = 0; | |
1832 | read_subdev = comedi_get_read_subdevice(dev_file_info); | |
1833 | if (read_subdev) { | |
1834 | poll_wait(file, &read_subdev->async->wait_head, wait); | |
1835 | if (!read_subdev->busy | |
476b8477 GKH |
1836 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
1837 | || !(comedi_get_subdevice_runflags(read_subdev) & | |
1838 | SRF_RUNNING)) { | |
ed9eccbe DS |
1839 | mask |= POLLIN | POLLRDNORM; |
1840 | } | |
1841 | } | |
1842 | write_subdev = comedi_get_write_subdevice(dev_file_info); | |
1843 | if (write_subdev) { | |
1844 | poll_wait(file, &write_subdev->async->wait_head, wait); | |
476b8477 GKH |
1845 | comedi_buf_write_alloc(write_subdev->async, |
1846 | write_subdev->async->prealloc_bufsz); | |
ed9eccbe | 1847 | if (!write_subdev->busy |
476b8477 GKH |
1848 | || !(comedi_get_subdevice_runflags(write_subdev) & |
1849 | SRF_RUNNING) | |
1850 | || comedi_buf_write_n_allocated(write_subdev->async) >= | |
1851 | bytes_per_sample(write_subdev->async->subdevice)) { | |
ed9eccbe DS |
1852 | mask |= POLLOUT | POLLWRNORM; |
1853 | } | |
1854 | } | |
1855 | ||
1856 | mutex_unlock(&dev->mutex); | |
1857 | return mask; | |
1858 | } | |
1859 | ||
92d0127c GKH |
1860 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
1861 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 1862 | { |
34c43922 | 1863 | struct comedi_subdevice *s; |
d163679c | 1864 | struct comedi_async *async; |
ed9eccbe DS |
1865 | int n, m, count = 0, retval = 0; |
1866 | DECLARE_WAITQUEUE(wait, current); | |
1867 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
3ffab428 BP |
1868 | struct comedi_device_file_info *dev_file_info; |
1869 | struct comedi_device *dev; | |
1870 | dev_file_info = comedi_get_device_file_info(minor); | |
1871 | ||
1872 | if (dev_file_info == NULL) | |
70fe742c | 1873 | return -ENODEV; |
3ffab428 BP |
1874 | dev = dev_file_info->device; |
1875 | if (dev == NULL) | |
70fe742c | 1876 | return -ENODEV; |
ed9eccbe DS |
1877 | |
1878 | if (!dev->attached) { | |
1879 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1880 | retval = -ENODEV; | |
1881 | goto done; | |
1882 | } | |
1883 | ||
1884 | s = comedi_get_write_subdevice(dev_file_info); | |
1885 | if (s == NULL) { | |
1886 | retval = -EIO; | |
1887 | goto done; | |
1888 | } | |
1889 | async = s->async; | |
1890 | ||
1891 | if (!nbytes) { | |
1892 | retval = 0; | |
1893 | goto done; | |
1894 | } | |
1895 | if (!s->busy) { | |
1896 | retval = 0; | |
1897 | goto done; | |
1898 | } | |
1899 | if (s->busy != file) { | |
1900 | retval = -EACCES; | |
1901 | goto done; | |
1902 | } | |
1903 | add_wait_queue(&async->wait_head, &wait); | |
1904 | while (nbytes > 0 && !retval) { | |
1905 | set_current_state(TASK_INTERRUPTIBLE); | |
1906 | ||
d2611540 IA |
1907 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
1908 | if (count == 0) { | |
1909 | if (comedi_get_subdevice_runflags(s) & | |
1910 | SRF_ERROR) { | |
1911 | retval = -EPIPE; | |
1912 | } else { | |
1913 | retval = 0; | |
1914 | } | |
1915 | do_become_nonbusy(dev, s); | |
1916 | } | |
1917 | break; | |
1918 | } | |
1919 | ||
ed9eccbe DS |
1920 | n = nbytes; |
1921 | ||
1922 | m = n; | |
476b8477 | 1923 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1924 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1925 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1926 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1927 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1928 | if (m < n) |
1929 | n = m; | |
1930 | ||
1931 | if (n == 0) { | |
ed9eccbe DS |
1932 | if (file->f_flags & O_NONBLOCK) { |
1933 | retval = -EAGAIN; | |
1934 | break; | |
1935 | } | |
6a9ce6b6 | 1936 | schedule(); |
ed9eccbe DS |
1937 | if (signal_pending(current)) { |
1938 | retval = -ERESTARTSYS; | |
1939 | break; | |
1940 | } | |
476b8477 | 1941 | if (!s->busy) |
ed9eccbe | 1942 | break; |
ed9eccbe DS |
1943 | if (s->busy != file) { |
1944 | retval = -EACCES; | |
1945 | break; | |
1946 | } | |
1947 | continue; | |
1948 | } | |
1949 | ||
1950 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1951 | buf, n); |
ed9eccbe DS |
1952 | if (m) { |
1953 | n -= m; | |
1954 | retval = -EFAULT; | |
1955 | } | |
1956 | comedi_buf_write_free(async, n); | |
1957 | ||
1958 | count += n; | |
1959 | nbytes -= n; | |
1960 | ||
1961 | buf += n; | |
1962 | break; /* makes device work like a pipe */ | |
1963 | } | |
1964 | set_current_state(TASK_RUNNING); | |
1965 | remove_wait_queue(&async->wait_head, &wait); | |
1966 | ||
1967 | done: | |
476b8477 | 1968 | return count ? count : retval; |
ed9eccbe DS |
1969 | } |
1970 | ||
92d0127c | 1971 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 1972 | loff_t *offset) |
ed9eccbe | 1973 | { |
34c43922 | 1974 | struct comedi_subdevice *s; |
d163679c | 1975 | struct comedi_async *async; |
ed9eccbe DS |
1976 | int n, m, count = 0, retval = 0; |
1977 | DECLARE_WAITQUEUE(wait, current); | |
1978 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
3ffab428 BP |
1979 | struct comedi_device_file_info *dev_file_info; |
1980 | struct comedi_device *dev; | |
1981 | dev_file_info = comedi_get_device_file_info(minor); | |
1982 | ||
1983 | if (dev_file_info == NULL) | |
70fe742c | 1984 | return -ENODEV; |
3ffab428 BP |
1985 | dev = dev_file_info->device; |
1986 | if (dev == NULL) | |
70fe742c | 1987 | return -ENODEV; |
ed9eccbe DS |
1988 | |
1989 | if (!dev->attached) { | |
1990 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1991 | retval = -ENODEV; | |
1992 | goto done; | |
1993 | } | |
1994 | ||
1995 | s = comedi_get_read_subdevice(dev_file_info); | |
1996 | if (s == NULL) { | |
1997 | retval = -EIO; | |
1998 | goto done; | |
1999 | } | |
2000 | async = s->async; | |
2001 | if (!nbytes) { | |
2002 | retval = 0; | |
2003 | goto done; | |
2004 | } | |
2005 | if (!s->busy) { | |
2006 | retval = 0; | |
2007 | goto done; | |
2008 | } | |
2009 | if (s->busy != file) { | |
2010 | retval = -EACCES; | |
2011 | goto done; | |
2012 | } | |
2013 | ||
2014 | add_wait_queue(&async->wait_head, &wait); | |
2015 | while (nbytes > 0 && !retval) { | |
2016 | set_current_state(TASK_INTERRUPTIBLE); | |
2017 | ||
2018 | n = nbytes; | |
2019 | ||
2020 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
2021 | /* printk("%d available\n",m); */ |
2022 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 2023 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 2024 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
2025 | if (m < n) |
2026 | n = m; | |
2027 | ||
2028 | if (n == 0) { | |
2029 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
2030 | do_become_nonbusy(dev, s); | |
2031 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 2032 | SRF_ERROR) { |
ed9eccbe DS |
2033 | retval = -EPIPE; |
2034 | } else { | |
2035 | retval = 0; | |
2036 | } | |
2037 | break; | |
2038 | } | |
2039 | if (file->f_flags & O_NONBLOCK) { | |
2040 | retval = -EAGAIN; | |
2041 | break; | |
2042 | } | |
6a9ce6b6 | 2043 | schedule(); |
ed9eccbe DS |
2044 | if (signal_pending(current)) { |
2045 | retval = -ERESTARTSYS; | |
2046 | break; | |
2047 | } | |
ed9eccbe DS |
2048 | if (!s->busy) { |
2049 | retval = 0; | |
2050 | break; | |
2051 | } | |
2052 | if (s->busy != file) { | |
2053 | retval = -EACCES; | |
2054 | break; | |
2055 | } | |
2056 | continue; | |
2057 | } | |
2058 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2059 | async->buf_read_ptr, n); |
ed9eccbe DS |
2060 | if (m) { |
2061 | n -= m; | |
2062 | retval = -EFAULT; | |
2063 | } | |
2064 | ||
2065 | comedi_buf_read_alloc(async, n); | |
2066 | comedi_buf_read_free(async, n); | |
2067 | ||
2068 | count += n; | |
2069 | nbytes -= n; | |
2070 | ||
2071 | buf += n; | |
2072 | break; /* makes device work like a pipe */ | |
2073 | } | |
2074 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && | |
476b8477 | 2075 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
2076 | do_become_nonbusy(dev, s); |
2077 | } | |
2078 | set_current_state(TASK_RUNNING); | |
2079 | remove_wait_queue(&async->wait_head, &wait); | |
2080 | ||
2081 | done: | |
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 | ||
2229 | static void comedi_cleanup_legacy_minors(void) | |
ed9eccbe | 2230 | { |
ed9eccbe DS |
2231 | unsigned i; |
2232 | ||
a5011a26 | 2233 | for (i = 0; i < comedi_num_legacy_minors; i++) |
883db3d9 | 2234 | comedi_free_board_minor(i); |
ed9eccbe DS |
2235 | } |
2236 | ||
a5011a26 | 2237 | static int __init comedi_init(void) |
ed9eccbe | 2238 | { |
a5011a26 HS |
2239 | int i; |
2240 | int retval; | |
ed9eccbe | 2241 | |
4f870fe6 | 2242 | pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
ed9eccbe | 2243 | |
a5011a26 HS |
2244 | if (comedi_num_legacy_minors < 0 || |
2245 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
4f870fe6 IA |
2246 | pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
2247 | COMEDI_NUM_BOARD_MINORS); | |
a5011a26 | 2248 | return -EINVAL; |
ed9eccbe | 2249 | } |
c43435d7 | 2250 | |
a5011a26 HS |
2251 | /* |
2252 | * comedi is unusable if both comedi_autoconfig and | |
2253 | * comedi_num_legacy_minors are zero, so we might as well adjust the | |
2254 | * defaults in that case | |
2255 | */ | |
2256 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) | |
2257 | comedi_num_legacy_minors = 16; | |
c43435d7 | 2258 | |
a5011a26 HS |
2259 | memset(comedi_file_info_table, 0, |
2260 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); | |
ed9eccbe | 2261 | |
a5011a26 HS |
2262 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2263 | COMEDI_NUM_MINORS, "comedi"); | |
2264 | if (retval) | |
2265 | return -EIO; | |
2266 | cdev_init(&comedi_cdev, &comedi_fops); | |
2267 | comedi_cdev.owner = THIS_MODULE; | |
2268 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2269 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
2270 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2271 | COMEDI_NUM_MINORS); | |
2272 | return -EIO; | |
883db3d9 | 2273 | } |
a5011a26 HS |
2274 | comedi_class = class_create(THIS_MODULE, "comedi"); |
2275 | if (IS_ERR(comedi_class)) { | |
4f870fe6 | 2276 | pr_err("comedi: failed to create class\n"); |
a5011a26 HS |
2277 | cdev_del(&comedi_cdev); |
2278 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2279 | COMEDI_NUM_MINORS); | |
2280 | return PTR_ERR(comedi_class); | |
883db3d9 | 2281 | } |
a5011a26 | 2282 | |
fb60367d HS |
2283 | comedi_class->dev_attrs = comedi_dev_attrs; |
2284 | ||
a5011a26 HS |
2285 | /* XXX requires /proc interface */ |
2286 | comedi_proc_init(); | |
2287 | ||
2288 | /* create devices files for legacy/manual use */ | |
2289 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
2290 | int minor; | |
2291 | minor = comedi_alloc_board_minor(NULL); | |
2292 | if (minor < 0) { | |
2293 | comedi_cleanup_legacy_minors(); | |
2294 | cdev_del(&comedi_cdev); | |
2295 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2296 | COMEDI_NUM_MINORS); | |
2297 | return minor; | |
2298 | } | |
883db3d9 | 2299 | } |
a5011a26 HS |
2300 | |
2301 | return 0; | |
ed9eccbe DS |
2302 | } |
2303 | ||
a5011a26 | 2304 | static void __exit comedi_cleanup(void) |
ed9eccbe | 2305 | { |
a5011a26 | 2306 | int i; |
ed9eccbe | 2307 | |
a5011a26 HS |
2308 | comedi_cleanup_legacy_minors(); |
2309 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) | |
2310 | BUG_ON(comedi_file_info_table[i]); | |
ed9eccbe | 2311 | |
a5011a26 HS |
2312 | class_destroy(comedi_class); |
2313 | cdev_del(&comedi_cdev); | |
2314 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
ed9eccbe | 2315 | |
a5011a26 | 2316 | comedi_proc_cleanup(); |
ed9eccbe DS |
2317 | } |
2318 | ||
a5011a26 HS |
2319 | module_init(comedi_init); |
2320 | module_exit(comedi_cleanup); | |
ed9eccbe | 2321 | |
a5011a26 HS |
2322 | void comedi_error(const struct comedi_device *dev, const char *s) |
2323 | { | |
4f870fe6 | 2324 | dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s); |
ed9eccbe | 2325 | } |
a5011a26 | 2326 | EXPORT_SYMBOL(comedi_error); |
883db3d9 | 2327 | |
a5011a26 | 2328 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2329 | { |
a5011a26 HS |
2330 | struct comedi_async *async = s->async; |
2331 | unsigned runflags = 0; | |
2332 | unsigned runflags_mask = 0; | |
883db3d9 | 2333 | |
a5011a26 | 2334 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
883db3d9 | 2335 | |
a5011a26 HS |
2336 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) |
2337 | return; | |
2338 | ||
2339 | if (s-> | |
2340 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2341 | COMEDI_CB_OVERFLOW)) { | |
2342 | runflags_mask |= SRF_RUNNING; | |
883db3d9 | 2343 | } |
a5011a26 HS |
2344 | /* remember if an error event has occurred, so an error |
2345 | * can be returned the next time the user does a read() */ | |
2346 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2347 | runflags_mask |= SRF_ERROR; | |
2348 | runflags |= SRF_ERROR; | |
883db3d9 | 2349 | } |
a5011a26 HS |
2350 | if (runflags_mask) { |
2351 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2352 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
883db3d9 FMH |
2353 | } |
2354 | ||
a5011a26 HS |
2355 | if (async->cb_mask & s->async->events) { |
2356 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
2357 | wake_up_interruptible(&async->wait_head); | |
2358 | if (s->subdev_flags & SDF_CMD_READ) | |
2359 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); | |
2360 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2361 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); | |
2362 | } else { | |
2363 | if (async->cb_func) | |
2364 | async->cb_func(s->async->events, async->cb_arg); | |
2365 | } | |
2366 | } | |
2367 | s->async->events = 0; | |
883db3d9 | 2368 | } |
a5011a26 | 2369 | EXPORT_SYMBOL(comedi_event); |
883db3d9 | 2370 | |
a5011a26 | 2371 | unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
883db3d9 | 2372 | { |
a5011a26 HS |
2373 | unsigned long flags; |
2374 | unsigned runflags; | |
883db3d9 | 2375 | |
a5011a26 HS |
2376 | spin_lock_irqsave(&s->spin_lock, flags); |
2377 | runflags = s->runflags; | |
2378 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
2379 | return runflags; | |
883db3d9 | 2380 | } |
a5011a26 | 2381 | EXPORT_SYMBOL(comedi_get_subdevice_runflags); |
883db3d9 | 2382 | |
a5011a26 HS |
2383 | static void comedi_device_init(struct comedi_device *dev) |
2384 | { | |
2385 | memset(dev, 0, sizeof(struct comedi_device)); | |
2386 | spin_lock_init(&dev->spinlock); | |
2387 | mutex_init(&dev->mutex); | |
2388 | dev->minor = -1; | |
2389 | } | |
883db3d9 | 2390 | |
a5011a26 | 2391 | static void comedi_device_cleanup(struct comedi_device *dev) |
883db3d9 | 2392 | { |
a5011a26 HS |
2393 | if (dev == NULL) |
2394 | return; | |
2395 | mutex_lock(&dev->mutex); | |
2396 | comedi_device_detach(dev); | |
2397 | mutex_unlock(&dev->mutex); | |
2398 | mutex_destroy(&dev->mutex); | |
2399 | } | |
2400 | ||
2401 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2402 | { | |
2403 | struct comedi_device_file_info *info; | |
2404 | struct device *csdev; | |
2405 | unsigned i; | |
a5011a26 HS |
2406 | |
2407 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
2408 | if (info == NULL) | |
2409 | return -ENOMEM; | |
2410 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); | |
2411 | if (info->device == NULL) { | |
2412 | kfree(info); | |
2413 | return -ENOMEM; | |
2414 | } | |
2415 | info->hardware_device = hardware_device; | |
2416 | comedi_device_init(info->device); | |
2417 | spin_lock(&comedi_file_info_table_lock); | |
2418 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
2419 | if (comedi_file_info_table[i] == NULL) { | |
2420 | comedi_file_info_table[i] = info; | |
2421 | break; | |
2422 | } | |
2423 | } | |
2424 | spin_unlock(&comedi_file_info_table_lock); | |
2425 | if (i == COMEDI_NUM_BOARD_MINORS) { | |
2426 | comedi_device_cleanup(info->device); | |
2427 | kfree(info->device); | |
2428 | kfree(info); | |
4f870fe6 | 2429 | pr_err("comedi: error: ran out of minor numbers for board device files.\n"); |
a5011a26 HS |
2430 | return -EBUSY; |
2431 | } | |
2432 | info->device->minor = i; | |
2433 | csdev = device_create(comedi_class, hardware_device, | |
2434 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2435 | if (!IS_ERR(csdev)) | |
2436 | info->device->class_dev = csdev; | |
2437 | dev_set_drvdata(csdev, info); | |
883db3d9 | 2438 | |
a5011a26 | 2439 | return i; |
883db3d9 FMH |
2440 | } |
2441 | ||
a5011a26 | 2442 | void comedi_free_board_minor(unsigned minor) |
883db3d9 | 2443 | { |
a5011a26 | 2444 | struct comedi_device_file_info *info; |
883db3d9 | 2445 | |
a5011a26 HS |
2446 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
2447 | spin_lock(&comedi_file_info_table_lock); | |
2448 | info = comedi_file_info_table[minor]; | |
2449 | comedi_file_info_table[minor] = NULL; | |
2450 | spin_unlock(&comedi_file_info_table_lock); | |
883db3d9 | 2451 | |
a5011a26 HS |
2452 | if (info) { |
2453 | struct comedi_device *dev = info->device; | |
2454 | if (dev) { | |
2455 | if (dev->class_dev) { | |
2456 | device_destroy(comedi_class, | |
2457 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
2458 | } | |
2459 | comedi_device_cleanup(dev); | |
2460 | kfree(dev); | |
2461 | } | |
2462 | kfree(info); | |
883db3d9 | 2463 | } |
883db3d9 FMH |
2464 | } |
2465 | ||
a5011a26 | 2466 | int comedi_find_board_minor(struct device *hardware_device) |
883db3d9 | 2467 | { |
a5011a26 HS |
2468 | int minor; |
2469 | struct comedi_device_file_info *info; | |
883db3d9 | 2470 | |
a5011a26 HS |
2471 | for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) { |
2472 | spin_lock(&comedi_file_info_table_lock); | |
2473 | info = comedi_file_info_table[minor]; | |
2474 | if (info && info->hardware_device == hardware_device) { | |
2475 | spin_unlock(&comedi_file_info_table_lock); | |
2476 | return minor; | |
2477 | } | |
2478 | spin_unlock(&comedi_file_info_table_lock); | |
883db3d9 | 2479 | } |
a5011a26 | 2480 | return -ENODEV; |
883db3d9 FMH |
2481 | } |
2482 | ||
a5011a26 HS |
2483 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
2484 | struct comedi_subdevice *s) | |
883db3d9 | 2485 | { |
a5011a26 HS |
2486 | struct comedi_device_file_info *info; |
2487 | struct device *csdev; | |
2488 | unsigned i; | |
883db3d9 | 2489 | |
a5011a26 HS |
2490 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
2491 | if (info == NULL) | |
2492 | return -ENOMEM; | |
2493 | info->device = dev; | |
2494 | info->read_subdevice = s; | |
2495 | info->write_subdevice = s; | |
2496 | spin_lock(&comedi_file_info_table_lock); | |
2497 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { | |
2498 | if (comedi_file_info_table[i] == NULL) { | |
2499 | comedi_file_info_table[i] = info; | |
2500 | break; | |
2501 | } | |
2502 | } | |
2503 | spin_unlock(&comedi_file_info_table_lock); | |
2504 | if (i == COMEDI_NUM_MINORS) { | |
2505 | kfree(info); | |
4f870fe6 | 2506 | pr_err("comedi: error: ran out of minor numbers for board device files.\n"); |
a5011a26 HS |
2507 | return -EBUSY; |
2508 | } | |
2509 | s->minor = i; | |
2510 | csdev = device_create(comedi_class, dev->class_dev, | |
2511 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
2512 | dev->minor, (int)(s - dev->subdevices)); | |
2513 | if (!IS_ERR(csdev)) | |
2514 | s->class_dev = csdev; | |
2515 | dev_set_drvdata(csdev, info); | |
883db3d9 | 2516 | |
a5011a26 | 2517 | return i; |
883db3d9 FMH |
2518 | } |
2519 | ||
a5011a26 | 2520 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2521 | { |
a5011a26 | 2522 | struct comedi_device_file_info *info; |
883db3d9 | 2523 | |
a5011a26 HS |
2524 | if (s == NULL) |
2525 | return; | |
2526 | if (s->minor < 0) | |
2527 | return; | |
883db3d9 | 2528 | |
a5011a26 HS |
2529 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
2530 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
883db3d9 | 2531 | |
a5011a26 HS |
2532 | spin_lock(&comedi_file_info_table_lock); |
2533 | info = comedi_file_info_table[s->minor]; | |
2534 | comedi_file_info_table[s->minor] = NULL; | |
2535 | spin_unlock(&comedi_file_info_table_lock); | |
883db3d9 | 2536 | |
a5011a26 HS |
2537 | if (s->class_dev) { |
2538 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2539 | s->class_dev = NULL; | |
883db3d9 | 2540 | } |
a5011a26 | 2541 | kfree(info); |
883db3d9 FMH |
2542 | } |
2543 | ||
a5011a26 HS |
2544 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) |
2545 | { | |
2546 | struct comedi_device_file_info *info; | |
2547 | ||
2548 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
2549 | spin_lock(&comedi_file_info_table_lock); | |
2550 | info = comedi_file_info_table[minor]; | |
2551 | spin_unlock(&comedi_file_info_table_lock); | |
2552 | return info; | |
2553 | } | |
2554 | EXPORT_SYMBOL_GPL(comedi_get_device_file_info); |