Commit | Line | Data |
---|---|---|
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 | ||
26 | #define __NO_VERSION__ | |
27 | #include "comedi_fops.h" | |
28 | #include "comedi_compat32.h" | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/kmod.h> | |
40 | #include <linux/poll.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/device.h> | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/fs.h> | |
45 | #include "comedidev.h" | |
46 | #include <linux/cdev.h> | |
883db3d9 | 47 | #include <linux/stat.h> |
ed9eccbe | 48 | |
476b8477 GKH |
49 | #include <linux/io.h> |
50 | #include <linux/uaccess.h> | |
ed9eccbe | 51 | |
476b8477 | 52 | /* #include "kvmem.h" */ |
ed9eccbe DS |
53 | |
54 | MODULE_AUTHOR("http://www.comedi.org"); | |
55 | MODULE_DESCRIPTION("Comedi core module"); | |
56 | MODULE_LICENSE("GPL"); | |
57 | ||
58 | #ifdef CONFIG_COMEDI_DEBUG | |
59 | int comedi_debug; | |
60 | module_param(comedi_debug, int, 0644); | |
61 | #endif | |
62 | ||
6a9d7a21 IA |
63 | int comedi_autoconfig = 1; |
64 | module_param(comedi_autoconfig, bool, 0444); | |
65 | ||
6705b68d | 66 | int comedi_num_legacy_minors; |
1dd33ab8 BP |
67 | module_param(comedi_num_legacy_minors, int, 0444); |
68 | ||
ed9eccbe | 69 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
476b8477 | 70 | static struct comedi_device_file_info |
0a85b6f0 | 71 | *comedi_file_info_table[COMEDI_NUM_MINORS]; |
476b8477 | 72 | |
0a85b6f0 MT |
73 | static int do_devconfig_ioctl(struct comedi_device *dev, |
74 | struct comedi_devconfig *arg); | |
71b5f4f1 | 75 | static int do_bufconfig_ioctl(struct comedi_device *dev, void *arg); |
0a85b6f0 MT |
76 | static int do_devinfo_ioctl(struct comedi_device *dev, |
77 | struct comedi_devinfo *arg, struct file *file); | |
78 | static int do_subdinfo_ioctl(struct comedi_device *dev, | |
79 | struct comedi_subdinfo *arg, void *file); | |
80 | static int do_chaninfo_ioctl(struct comedi_device *dev, | |
81 | struct comedi_chaninfo *arg); | |
71b5f4f1 BP |
82 | static int do_bufinfo_ioctl(struct comedi_device *dev, void *arg); |
83 | static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file); | |
0a85b6f0 MT |
84 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
85 | void *file); | |
86 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, | |
87 | void *file); | |
88 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, | |
89 | void *file); | |
71b5f4f1 BP |
90 | static int do_cmdtest_ioctl(struct comedi_device *dev, void *arg, void *file); |
91 | static int do_insnlist_ioctl(struct comedi_device *dev, void *arg, void *file); | |
92 | static int do_insn_ioctl(struct comedi_device *dev, void *arg, void *file); | |
0a85b6f0 MT |
93 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd, |
94 | void *file); | |
71b5f4f1 | 95 | |
0a85b6f0 MT |
96 | extern void do_become_nonbusy(struct comedi_device *dev, |
97 | struct comedi_subdevice *s); | |
34c43922 | 98 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); |
ed9eccbe DS |
99 | |
100 | static int comedi_fasync(int fd, struct file *file, int on); | |
101 | ||
71b5f4f1 | 102 | static int is_device_busy(struct comedi_device *dev); |
883db3d9 FMH |
103 | static int resize_async_buffer(struct comedi_device *dev, |
104 | struct comedi_subdevice *s, | |
105 | struct comedi_async *async, unsigned new_size); | |
106 | ||
107 | /* declarations for sysfs attribute files */ | |
108 | static struct device_attribute dev_attr_max_read_buffer_kb; | |
109 | static struct device_attribute dev_attr_read_buffer_kb; | |
110 | static struct device_attribute dev_attr_max_write_buffer_kb; | |
111 | static struct device_attribute dev_attr_write_buffer_kb; | |
ed9eccbe | 112 | |
ed9eccbe | 113 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
476b8477 | 114 | unsigned long arg) |
ed9eccbe DS |
115 | { |
116 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
117 | struct comedi_device_file_info *dev_file_info = |
118 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 119 | struct comedi_device *dev; |
ed9eccbe DS |
120 | int rc; |
121 | ||
53b670a7 FMH |
122 | if (dev_file_info == NULL || dev_file_info->device == NULL) |
123 | return -ENODEV; | |
124 | dev = dev_file_info->device; | |
125 | ||
ed9eccbe DS |
126 | mutex_lock(&dev->mutex); |
127 | ||
128 | /* Device config is special, because it must work on | |
129 | * an unconfigured device. */ | |
130 | if (cmd == COMEDI_DEVCONFIG) { | |
131 | rc = do_devconfig_ioctl(dev, (void *)arg); | |
132 | goto done; | |
133 | } | |
134 | ||
135 | if (!dev->attached) { | |
136 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
137 | rc = -ENODEV; | |
138 | goto done; | |
139 | } | |
140 | ||
141 | switch (cmd) { | |
142 | case COMEDI_BUFCONFIG: | |
143 | rc = do_bufconfig_ioctl(dev, (void *)arg); | |
144 | break; | |
145 | case COMEDI_DEVINFO: | |
146 | rc = do_devinfo_ioctl(dev, (void *)arg, file); | |
147 | break; | |
148 | case COMEDI_SUBDINFO: | |
149 | rc = do_subdinfo_ioctl(dev, (void *)arg, file); | |
150 | break; | |
151 | case COMEDI_CHANINFO: | |
152 | rc = do_chaninfo_ioctl(dev, (void *)arg); | |
153 | break; | |
154 | case COMEDI_RANGEINFO: | |
155 | rc = do_rangeinfo_ioctl(dev, (void *)arg); | |
156 | break; | |
157 | case COMEDI_BUFINFO: | |
158 | rc = do_bufinfo_ioctl(dev, (void *)arg); | |
159 | break; | |
160 | case COMEDI_LOCK: | |
161 | rc = do_lock_ioctl(dev, arg, file); | |
162 | break; | |
163 | case COMEDI_UNLOCK: | |
164 | rc = do_unlock_ioctl(dev, arg, file); | |
165 | break; | |
166 | case COMEDI_CANCEL: | |
167 | rc = do_cancel_ioctl(dev, arg, file); | |
168 | break; | |
169 | case COMEDI_CMD: | |
170 | rc = do_cmd_ioctl(dev, (void *)arg, file); | |
171 | break; | |
172 | case COMEDI_CMDTEST: | |
173 | rc = do_cmdtest_ioctl(dev, (void *)arg, file); | |
174 | break; | |
175 | case COMEDI_INSNLIST: | |
176 | rc = do_insnlist_ioctl(dev, (void *)arg, file); | |
177 | break; | |
178 | case COMEDI_INSN: | |
179 | rc = do_insn_ioctl(dev, (void *)arg, file); | |
180 | break; | |
181 | case COMEDI_POLL: | |
182 | rc = do_poll_ioctl(dev, arg, file); | |
183 | break; | |
184 | default: | |
185 | rc = -ENOTTY; | |
186 | break; | |
187 | } | |
188 | ||
476b8477 | 189 | done: |
ed9eccbe DS |
190 | mutex_unlock(&dev->mutex); |
191 | return rc; | |
192 | } | |
193 | ||
194 | /* | |
195 | COMEDI_DEVCONFIG | |
196 | device config ioctl | |
197 | ||
198 | arg: | |
199 | pointer to devconfig structure | |
200 | ||
201 | reads: | |
202 | devconfig structure at arg | |
203 | ||
204 | writes: | |
205 | none | |
206 | */ | |
0a85b6f0 MT |
207 | static int do_devconfig_ioctl(struct comedi_device *dev, |
208 | struct comedi_devconfig *arg) | |
ed9eccbe | 209 | { |
0707bb04 | 210 | struct comedi_devconfig it; |
ed9eccbe DS |
211 | int ret; |
212 | unsigned char *aux_data = NULL; | |
213 | int aux_len; | |
214 | ||
215 | if (!capable(CAP_SYS_ADMIN)) | |
216 | return -EPERM; | |
217 | ||
218 | if (arg == NULL) { | |
219 | if (is_device_busy(dev)) | |
220 | return -EBUSY; | |
476b8477 | 221 | if (dev->attached) { |
ed9eccbe DS |
222 | struct module *driver_module = dev->driver->module; |
223 | comedi_device_detach(dev); | |
224 | module_put(driver_module); | |
225 | } | |
226 | return 0; | |
227 | } | |
228 | ||
0707bb04 | 229 | if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) |
ed9eccbe DS |
230 | return -EFAULT; |
231 | ||
232 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
233 | ||
234 | if (comedi_aux_data(it.options, 0) && | |
476b8477 | 235 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
ed9eccbe DS |
236 | int bit_shift; |
237 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; | |
238 | if (aux_len < 0) | |
239 | return -EFAULT; | |
240 | ||
241 | aux_data = vmalloc(aux_len); | |
242 | if (!aux_data) | |
243 | return -ENOMEM; | |
244 | ||
245 | if (copy_from_user(aux_data, | |
476b8477 | 246 | comedi_aux_data(it.options, 0), aux_len)) { |
ed9eccbe DS |
247 | vfree(aux_data); |
248 | return -EFAULT; | |
249 | } | |
250 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = | |
476b8477 | 251 | (unsigned long)aux_data; |
ed9eccbe DS |
252 | if (sizeof(void *) > sizeof(int)) { |
253 | bit_shift = sizeof(int) * 8; | |
254 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = | |
476b8477 | 255 | ((unsigned long)aux_data) >> bit_shift; |
ed9eccbe DS |
256 | } else |
257 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; | |
258 | } | |
259 | ||
260 | ret = comedi_device_attach(dev, &it); | |
476b8477 GKH |
261 | if (ret == 0) { |
262 | if (!try_module_get(dev->driver->module)) { | |
ed9eccbe DS |
263 | comedi_device_detach(dev); |
264 | return -ENOSYS; | |
265 | } | |
266 | } | |
267 | ||
268 | if (aux_data) | |
269 | vfree(aux_data); | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
274 | /* | |
275 | COMEDI_BUFCONFIG | |
276 | buffer configuration ioctl | |
277 | ||
278 | arg: | |
279 | pointer to bufconfig structure | |
280 | ||
281 | reads: | |
282 | bufconfig at arg | |
283 | ||
284 | writes: | |
285 | modified bufconfig at arg | |
286 | ||
287 | */ | |
71b5f4f1 | 288 | static int do_bufconfig_ioctl(struct comedi_device *dev, void *arg) |
ed9eccbe | 289 | { |
be6aba4a | 290 | struct comedi_bufconfig bc; |
d163679c | 291 | struct comedi_async *async; |
34c43922 | 292 | struct comedi_subdevice *s; |
883db3d9 | 293 | int retval = 0; |
ed9eccbe | 294 | |
be6aba4a | 295 | if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
296 | return -EFAULT; |
297 | ||
298 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
299 | return -EINVAL; | |
300 | ||
301 | s = dev->subdevices + bc.subdevice; | |
302 | async = s->async; | |
303 | ||
304 | if (!async) { | |
305 | DPRINTK("subdevice does not have async capability\n"); | |
306 | bc.size = 0; | |
307 | bc.maximum_size = 0; | |
308 | goto copyback; | |
309 | } | |
310 | ||
311 | if (bc.maximum_size) { | |
312 | if (!capable(CAP_SYS_ADMIN)) | |
313 | return -EPERM; | |
314 | ||
315 | async->max_bufsize = bc.maximum_size; | |
316 | } | |
317 | ||
318 | if (bc.size) { | |
883db3d9 FMH |
319 | retval = resize_async_buffer(dev, s, async, bc.size); |
320 | if (retval < 0) | |
321 | return retval; | |
ed9eccbe DS |
322 | } |
323 | ||
324 | bc.size = async->prealloc_bufsz; | |
325 | bc.maximum_size = async->max_bufsize; | |
326 | ||
476b8477 | 327 | copyback: |
be6aba4a | 328 | if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
329 | return -EFAULT; |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | /* | |
335 | COMEDI_DEVINFO | |
336 | device info ioctl | |
337 | ||
338 | arg: | |
339 | pointer to devinfo structure | |
340 | ||
341 | reads: | |
342 | none | |
343 | ||
344 | writes: | |
345 | devinfo structure | |
346 | ||
347 | */ | |
0a85b6f0 MT |
348 | static int do_devinfo_ioctl(struct comedi_device *dev, |
349 | struct comedi_devinfo *arg, struct file *file) | |
ed9eccbe | 350 | { |
063db04b | 351 | struct comedi_devinfo devinfo; |
ed9eccbe | 352 | const unsigned minor = iminor(file->f_dentry->d_inode); |
476b8477 GKH |
353 | struct comedi_device_file_info *dev_file_info = |
354 | comedi_get_device_file_info(minor); | |
34c43922 | 355 | struct comedi_subdevice *read_subdev = |
476b8477 | 356 | comedi_get_read_subdevice(dev_file_info); |
34c43922 | 357 | struct comedi_subdevice *write_subdev = |
476b8477 | 358 | comedi_get_write_subdevice(dev_file_info); |
ed9eccbe DS |
359 | |
360 | memset(&devinfo, 0, sizeof(devinfo)); | |
361 | ||
362 | /* fill devinfo structure */ | |
363 | devinfo.version_code = COMEDI_VERSION_CODE; | |
364 | devinfo.n_subdevs = dev->n_subdevices; | |
365 | memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); | |
366 | memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
367 | ||
476b8477 | 368 | if (read_subdev) |
ed9eccbe | 369 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
476b8477 | 370 | else |
ed9eccbe | 371 | devinfo.read_subdevice = -1; |
476b8477 GKH |
372 | |
373 | if (write_subdev) | |
ed9eccbe | 374 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
476b8477 | 375 | else |
ed9eccbe | 376 | devinfo.write_subdevice = -1; |
ed9eccbe | 377 | |
063db04b | 378 | if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) |
ed9eccbe DS |
379 | return -EFAULT; |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | /* | |
385 | COMEDI_SUBDINFO | |
386 | subdevice info ioctl | |
387 | ||
388 | arg: | |
389 | pointer to array of subdevice info structures | |
390 | ||
391 | reads: | |
392 | none | |
393 | ||
394 | writes: | |
395 | array of subdevice info structures at arg | |
396 | ||
397 | */ | |
0a85b6f0 MT |
398 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
399 | struct comedi_subdinfo *arg, void *file) | |
ed9eccbe DS |
400 | { |
401 | int ret, i; | |
bd52efbb | 402 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 403 | struct comedi_subdevice *s; |
ed9eccbe | 404 | |
0a85b6f0 MT |
405 | tmp = |
406 | kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), | |
407 | GFP_KERNEL); | |
ed9eccbe DS |
408 | if (!tmp) |
409 | return -ENOMEM; | |
410 | ||
411 | /* fill subdinfo structs */ | |
412 | for (i = 0; i < dev->n_subdevices; i++) { | |
413 | s = dev->subdevices + i; | |
414 | us = tmp + i; | |
415 | ||
416 | us->type = s->type; | |
417 | us->n_chan = s->n_chan; | |
418 | us->subd_flags = s->subdev_flags; | |
419 | if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) | |
420 | us->subd_flags |= SDF_RUNNING; | |
421 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
422 | us->timer_type = TIMER_nanosec; | |
423 | us->len_chanlist = s->len_chanlist; | |
424 | us->maxdata = s->maxdata; | |
425 | if (s->range_table) { | |
426 | us->range_type = | |
476b8477 | 427 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
428 | } else { |
429 | us->range_type = 0; /* XXX */ | |
430 | } | |
431 | us->flags = s->flags; | |
432 | ||
433 | if (s->busy) | |
434 | us->subd_flags |= SDF_BUSY; | |
435 | if (s->busy == file) | |
436 | us->subd_flags |= SDF_BUSY_OWNER; | |
437 | if (s->lock) | |
438 | us->subd_flags |= SDF_LOCKED; | |
439 | if (s->lock == file) | |
440 | us->subd_flags |= SDF_LOCK_OWNER; | |
441 | if (!s->maxdata && s->maxdata_list) | |
442 | us->subd_flags |= SDF_MAXDATA; | |
443 | if (s->flaglist) | |
444 | us->subd_flags |= SDF_FLAGS; | |
445 | if (s->range_table_list) | |
446 | us->subd_flags |= SDF_RANGETYPE; | |
447 | if (s->do_cmd) | |
448 | us->subd_flags |= SDF_CMD; | |
449 | ||
450 | if (s->insn_bits != &insn_inval) | |
451 | us->insn_bits_support = COMEDI_SUPPORTED; | |
452 | else | |
453 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
454 | ||
455 | us->settling_time_0 = s->settling_time_0; | |
456 | } | |
457 | ||
458 | ret = copy_to_user(arg, tmp, | |
bd52efbb | 459 | dev->n_subdevices * sizeof(struct comedi_subdinfo)); |
ed9eccbe DS |
460 | |
461 | kfree(tmp); | |
462 | ||
463 | return ret ? -EFAULT : 0; | |
464 | } | |
465 | ||
466 | /* | |
467 | COMEDI_CHANINFO | |
468 | subdevice info ioctl | |
469 | ||
470 | arg: | |
471 | pointer to chaninfo structure | |
472 | ||
473 | reads: | |
474 | chaninfo structure at arg | |
475 | ||
476 | writes: | |
477 | arrays at elements of chaninfo structure | |
478 | ||
479 | */ | |
0a85b6f0 MT |
480 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
481 | struct comedi_chaninfo *arg) | |
ed9eccbe | 482 | { |
34c43922 | 483 | struct comedi_subdevice *s; |
a18b416d | 484 | struct comedi_chaninfo it; |
ed9eccbe | 485 | |
a18b416d | 486 | if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) |
ed9eccbe DS |
487 | return -EFAULT; |
488 | ||
489 | if (it.subdev >= dev->n_subdevices) | |
490 | return -EINVAL; | |
491 | s = dev->subdevices + it.subdev; | |
492 | ||
493 | if (it.maxdata_list) { | |
494 | if (s->maxdata || !s->maxdata_list) | |
495 | return -EINVAL; | |
496 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 497 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
498 | return -EFAULT; |
499 | } | |
500 | ||
501 | if (it.flaglist) { | |
502 | if (!s->flaglist) | |
503 | return -EINVAL; | |
504 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 505 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
506 | return -EFAULT; |
507 | } | |
508 | ||
509 | if (it.rangelist) { | |
510 | int i; | |
511 | ||
512 | if (!s->range_table_list) | |
513 | return -EINVAL; | |
514 | for (i = 0; i < s->n_chan; i++) { | |
515 | int x; | |
516 | ||
517 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 518 | (s->range_table_list[i]->length); |
ed9eccbe DS |
519 | put_user(x, it.rangelist + i); |
520 | } | |
476b8477 GKH |
521 | #if 0 |
522 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 523 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
524 | return -EFAULT; |
525 | #endif | |
ed9eccbe DS |
526 | } |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /* | |
532 | COMEDI_BUFINFO | |
533 | buffer information ioctl | |
534 | ||
535 | arg: | |
536 | pointer to bufinfo structure | |
537 | ||
538 | reads: | |
539 | bufinfo at arg | |
540 | ||
541 | writes: | |
542 | modified bufinfo at arg | |
543 | ||
544 | */ | |
71b5f4f1 | 545 | static int do_bufinfo_ioctl(struct comedi_device *dev, void *arg) |
ed9eccbe | 546 | { |
9aa5339a | 547 | struct comedi_bufinfo bi; |
34c43922 | 548 | struct comedi_subdevice *s; |
d163679c | 549 | struct comedi_async *async; |
ed9eccbe | 550 | |
9aa5339a | 551 | if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
552 | return -EFAULT; |
553 | ||
554 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
555 | return -EINVAL; | |
556 | ||
557 | s = dev->subdevices + bi.subdevice; | |
558 | async = s->async; | |
559 | ||
560 | if (!async) { | |
561 | DPRINTK("subdevice does not have async capability\n"); | |
562 | bi.buf_write_ptr = 0; | |
563 | bi.buf_read_ptr = 0; | |
564 | bi.buf_write_count = 0; | |
565 | bi.buf_read_count = 0; | |
566 | goto copyback; | |
567 | } | |
568 | ||
569 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
570 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
571 | comedi_buf_read_free(async, bi.bytes_read); | |
572 | ||
573 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | | |
476b8477 GKH |
574 | SRF_RUNNING)) |
575 | && async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
576 | do_become_nonbusy(dev, s); |
577 | } | |
578 | } | |
579 | ||
580 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
581 | bi.bytes_written = | |
476b8477 | 582 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
583 | comedi_buf_write_free(async, bi.bytes_written); |
584 | } | |
585 | ||
586 | bi.buf_write_count = async->buf_write_count; | |
587 | bi.buf_write_ptr = async->buf_write_ptr; | |
588 | bi.buf_read_count = async->buf_read_count; | |
589 | bi.buf_read_ptr = async->buf_read_ptr; | |
590 | ||
476b8477 | 591 | copyback: |
9aa5339a | 592 | if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
593 | return -EFAULT; |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
0a85b6f0 MT |
598 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
599 | unsigned int *data, void *file); | |
ed9eccbe DS |
600 | /* |
601 | * COMEDI_INSNLIST | |
602 | * synchronous instructions | |
603 | * | |
604 | * arg: | |
605 | * pointer to sync cmd structure | |
606 | * | |
607 | * reads: | |
608 | * sync cmd struct at arg | |
609 | * instruction list | |
610 | * data (for writes) | |
611 | * | |
612 | * writes: | |
613 | * data (for reads) | |
614 | */ | |
615 | /* arbitrary limits */ | |
616 | #define MAX_SAMPLES 256 | |
71b5f4f1 | 617 | static int do_insnlist_ioctl(struct comedi_device *dev, void *arg, void *file) |
ed9eccbe | 618 | { |
da613f4f | 619 | struct comedi_insnlist insnlist; |
90035c08 | 620 | struct comedi_insn *insns = NULL; |
790c5541 | 621 | unsigned int *data = NULL; |
ed9eccbe DS |
622 | int i = 0; |
623 | int ret = 0; | |
624 | ||
da613f4f | 625 | if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
ed9eccbe DS |
626 | return -EFAULT; |
627 | ||
790c5541 | 628 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
629 | if (!data) { |
630 | DPRINTK("kmalloc failed\n"); | |
631 | ret = -ENOMEM; | |
632 | goto error; | |
633 | } | |
634 | ||
0a85b6f0 MT |
635 | insns = |
636 | kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); | |
ed9eccbe DS |
637 | if (!insns) { |
638 | DPRINTK("kmalloc failed\n"); | |
639 | ret = -ENOMEM; | |
640 | goto error; | |
641 | } | |
642 | ||
643 | if (copy_from_user(insns, insnlist.insns, | |
90035c08 | 644 | sizeof(struct comedi_insn) * insnlist.n_insns)) { |
ed9eccbe DS |
645 | DPRINTK("copy_from_user failed\n"); |
646 | ret = -EFAULT; | |
647 | goto error; | |
648 | } | |
649 | ||
650 | for (i = 0; i < insnlist.n_insns; i++) { | |
651 | if (insns[i].n > MAX_SAMPLES) { | |
652 | DPRINTK("number of samples too large\n"); | |
653 | ret = -EINVAL; | |
654 | goto error; | |
655 | } | |
656 | if (insns[i].insn & INSN_MASK_WRITE) { | |
657 | if (copy_from_user(data, insns[i].data, | |
790c5541 | 658 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
659 | DPRINTK("copy_from_user failed\n"); |
660 | ret = -EFAULT; | |
661 | goto error; | |
662 | } | |
663 | } | |
664 | ret = parse_insn(dev, insns + i, data, file); | |
665 | if (ret < 0) | |
666 | goto error; | |
667 | if (insns[i].insn & INSN_MASK_READ) { | |
668 | if (copy_to_user(insns[i].data, data, | |
790c5541 | 669 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
670 | DPRINTK("copy_to_user failed\n"); |
671 | ret = -EFAULT; | |
672 | goto error; | |
673 | } | |
674 | } | |
675 | if (need_resched()) | |
676 | schedule(); | |
677 | } | |
678 | ||
476b8477 GKH |
679 | error: |
680 | kfree(insns); | |
681 | kfree(data); | |
ed9eccbe DS |
682 | |
683 | if (ret < 0) | |
684 | return ret; | |
685 | return i; | |
686 | } | |
687 | ||
0a85b6f0 MT |
688 | static int check_insn_config_length(struct comedi_insn *insn, |
689 | unsigned int *data) | |
ed9eccbe | 690 | { |
476b8477 GKH |
691 | if (insn->n < 1) |
692 | return -EINVAL; | |
ed9eccbe DS |
693 | |
694 | switch (data[0]) { | |
695 | case INSN_CONFIG_DIO_OUTPUT: | |
696 | case INSN_CONFIG_DIO_INPUT: | |
697 | case INSN_CONFIG_DISARM: | |
698 | case INSN_CONFIG_RESET: | |
699 | if (insn->n == 1) | |
700 | return 0; | |
701 | break; | |
702 | case INSN_CONFIG_ARM: | |
703 | case INSN_CONFIG_DIO_QUERY: | |
704 | case INSN_CONFIG_BLOCK_SIZE: | |
705 | case INSN_CONFIG_FILTER: | |
706 | case INSN_CONFIG_SERIAL_CLOCK: | |
707 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
708 | case INSN_CONFIG_ALT_SOURCE: | |
709 | case INSN_CONFIG_SET_COUNTER_MODE: | |
710 | case INSN_CONFIG_8254_READ_STATUS: | |
711 | case INSN_CONFIG_SET_ROUTING: | |
712 | case INSN_CONFIG_GET_ROUTING: | |
713 | case INSN_CONFIG_GET_PWM_STATUS: | |
714 | case INSN_CONFIG_PWM_SET_PERIOD: | |
715 | case INSN_CONFIG_PWM_GET_PERIOD: | |
716 | if (insn->n == 2) | |
717 | return 0; | |
718 | break; | |
719 | case INSN_CONFIG_SET_GATE_SRC: | |
720 | case INSN_CONFIG_GET_GATE_SRC: | |
721 | case INSN_CONFIG_SET_CLOCK_SRC: | |
722 | case INSN_CONFIG_GET_CLOCK_SRC: | |
723 | case INSN_CONFIG_SET_OTHER_SRC: | |
724 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
725 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
726 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
727 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
728 | if (insn->n == 3) | |
729 | return 0; | |
730 | break; | |
731 | case INSN_CONFIG_PWM_OUTPUT: | |
732 | case INSN_CONFIG_ANALOG_TRIG: | |
733 | if (insn->n == 5) | |
734 | return 0; | |
735 | break; | |
0a85b6f0 MT |
736 | /* by default we allow the insn since we don't have checks for |
737 | * all possible cases yet */ | |
ed9eccbe | 738 | default: |
5f74ea14 | 739 | printk("comedi: no check for data length of config insn id " |
0a85b6f0 MT |
740 | "%i is implemented.\n" |
741 | " Add a check to %s in %s.\n" | |
742 | " Assuming n=%i is correct.\n", data[0], __func__, | |
743 | __FILE__, insn->n); | |
ed9eccbe DS |
744 | return 0; |
745 | break; | |
746 | } | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
0a85b6f0 MT |
750 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
751 | unsigned int *data, void *file) | |
ed9eccbe | 752 | { |
34c43922 | 753 | struct comedi_subdevice *s; |
ed9eccbe DS |
754 | int ret = 0; |
755 | int i; | |
756 | ||
757 | if (insn->insn & INSN_MASK_SPECIAL) { | |
758 | /* a non-subdevice instruction */ | |
759 | ||
760 | switch (insn->insn) { | |
761 | case INSN_GTOD: | |
762 | { | |
763 | struct timeval tv; | |
764 | ||
765 | if (insn->n != 2) { | |
766 | ret = -EINVAL; | |
767 | break; | |
768 | } | |
769 | ||
770 | do_gettimeofday(&tv); | |
771 | data[0] = tv.tv_sec; | |
772 | data[1] = tv.tv_usec; | |
773 | ret = 2; | |
774 | ||
775 | break; | |
776 | } | |
777 | case INSN_WAIT: | |
778 | if (insn->n != 1 || data[0] >= 100000) { | |
779 | ret = -EINVAL; | |
780 | break; | |
781 | } | |
782 | udelay(data[0] / 1000); | |
783 | ret = 1; | |
784 | break; | |
785 | case INSN_INTTRIG: | |
786 | if (insn->n != 1) { | |
787 | ret = -EINVAL; | |
788 | break; | |
789 | } | |
790 | if (insn->subdev >= dev->n_subdevices) { | |
791 | DPRINTK("%d not usable subdevice\n", | |
792 | insn->subdev); | |
793 | ret = -EINVAL; | |
794 | break; | |
795 | } | |
796 | s = dev->subdevices + insn->subdev; | |
797 | if (!s->async) { | |
798 | DPRINTK("no async\n"); | |
799 | ret = -EINVAL; | |
800 | break; | |
801 | } | |
802 | if (!s->async->inttrig) { | |
803 | DPRINTK("no inttrig\n"); | |
804 | ret = -EAGAIN; | |
805 | break; | |
806 | } | |
807 | ret = s->async->inttrig(dev, s, insn->data[0]); | |
808 | if (ret >= 0) | |
809 | ret = 1; | |
810 | break; | |
811 | default: | |
812 | DPRINTK("invalid insn\n"); | |
813 | ret = -EINVAL; | |
814 | break; | |
815 | } | |
816 | } else { | |
817 | /* a subdevice instruction */ | |
790c5541 | 818 | unsigned int maxdata; |
ed9eccbe DS |
819 | |
820 | if (insn->subdev >= dev->n_subdevices) { | |
821 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
822 | ret = -EINVAL; | |
823 | goto out; | |
824 | } | |
825 | s = dev->subdevices + insn->subdev; | |
826 | ||
827 | if (s->type == COMEDI_SUBD_UNUSED) { | |
828 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
829 | ret = -EIO; | |
830 | goto out; | |
831 | } | |
832 | ||
833 | /* are we locked? (ioctl lock) */ | |
834 | if (s->lock && s->lock != file) { | |
835 | DPRINTK("device locked\n"); | |
836 | ret = -EACCES; | |
837 | goto out; | |
838 | } | |
839 | ||
476b8477 GKH |
840 | ret = check_chanlist(s, 1, &insn->chanspec); |
841 | if (ret < 0) { | |
ed9eccbe DS |
842 | ret = -EINVAL; |
843 | DPRINTK("bad chanspec\n"); | |
844 | goto out; | |
845 | } | |
846 | ||
847 | if (s->busy) { | |
848 | ret = -EBUSY; | |
849 | goto out; | |
850 | } | |
851 | /* This looks arbitrary. It is. */ | |
852 | s->busy = &parse_insn; | |
853 | switch (insn->insn) { | |
854 | case INSN_READ: | |
855 | ret = s->insn_read(dev, s, insn, data); | |
856 | break; | |
857 | case INSN_WRITE: | |
858 | maxdata = s->maxdata_list | |
476b8477 GKH |
859 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
860 | : s->maxdata; | |
ed9eccbe DS |
861 | for (i = 0; i < insn->n; ++i) { |
862 | if (data[i] > maxdata) { | |
863 | ret = -EINVAL; | |
864 | DPRINTK("bad data value(s)\n"); | |
865 | break; | |
866 | } | |
867 | } | |
868 | if (ret == 0) | |
869 | ret = s->insn_write(dev, s, insn, data); | |
870 | break; | |
871 | case INSN_BITS: | |
872 | if (insn->n != 2) { | |
873 | ret = -EINVAL; | |
874 | break; | |
875 | } | |
876 | ret = s->insn_bits(dev, s, insn, data); | |
877 | break; | |
878 | case INSN_CONFIG: | |
879 | ret = check_insn_config_length(insn, data); | |
880 | if (ret) | |
881 | break; | |
882 | ret = s->insn_config(dev, s, insn, data); | |
883 | break; | |
884 | default: | |
885 | ret = -EINVAL; | |
886 | break; | |
887 | } | |
888 | ||
889 | s->busy = NULL; | |
890 | } | |
891 | ||
476b8477 | 892 | out: |
ed9eccbe DS |
893 | return ret; |
894 | } | |
895 | ||
896 | /* | |
897 | * COMEDI_INSN | |
898 | * synchronous instructions | |
899 | * | |
900 | * arg: | |
901 | * pointer to insn | |
902 | * | |
903 | * reads: | |
90035c08 | 904 | * struct comedi_insn struct at arg |
ed9eccbe DS |
905 | * data (for writes) |
906 | * | |
907 | * writes: | |
908 | * data (for reads) | |
909 | */ | |
71b5f4f1 | 910 | static int do_insn_ioctl(struct comedi_device *dev, void *arg, void *file) |
ed9eccbe | 911 | { |
90035c08 | 912 | struct comedi_insn insn; |
790c5541 | 913 | unsigned int *data = NULL; |
ed9eccbe DS |
914 | int ret = 0; |
915 | ||
790c5541 | 916 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
917 | if (!data) { |
918 | ret = -ENOMEM; | |
919 | goto error; | |
920 | } | |
921 | ||
90035c08 | 922 | if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
ed9eccbe DS |
923 | ret = -EFAULT; |
924 | goto error; | |
925 | } | |
926 | ||
927 | /* This is where the behavior of insn and insnlist deviate. */ | |
928 | if (insn.n > MAX_SAMPLES) | |
929 | insn.n = MAX_SAMPLES; | |
930 | if (insn.insn & INSN_MASK_WRITE) { | |
0a85b6f0 MT |
931 | if (copy_from_user |
932 | (data, insn.data, insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
933 | ret = -EFAULT; |
934 | goto error; | |
935 | } | |
936 | } | |
937 | ret = parse_insn(dev, &insn, data, file); | |
938 | if (ret < 0) | |
939 | goto error; | |
940 | if (insn.insn & INSN_MASK_READ) { | |
0a85b6f0 MT |
941 | if (copy_to_user |
942 | (insn.data, data, insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
943 | ret = -EFAULT; |
944 | goto error; | |
945 | } | |
946 | } | |
947 | ret = insn.n; | |
948 | ||
476b8477 GKH |
949 | error: |
950 | kfree(data); | |
ed9eccbe DS |
951 | |
952 | return ret; | |
953 | } | |
954 | ||
955 | /* | |
956 | COMEDI_CMD | |
957 | command ioctl | |
958 | ||
959 | arg: | |
960 | pointer to cmd structure | |
961 | ||
962 | reads: | |
963 | cmd structure at arg | |
964 | channel/range list | |
965 | ||
966 | writes: | |
967 | modified cmd structure at arg | |
968 | ||
969 | */ | |
71b5f4f1 | 970 | static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file) |
ed9eccbe | 971 | { |
ea6d0d4c | 972 | struct comedi_cmd user_cmd; |
34c43922 | 973 | struct comedi_subdevice *s; |
d163679c | 974 | struct comedi_async *async; |
ed9eccbe DS |
975 | int ret = 0; |
976 | unsigned int *chanlist_saver = NULL; | |
977 | ||
ea6d0d4c | 978 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
979 | DPRINTK("bad cmd address\n"); |
980 | return -EFAULT; | |
981 | } | |
476b8477 | 982 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
983 | chanlist_saver = user_cmd.chanlist; |
984 | ||
985 | if (user_cmd.subdev >= dev->n_subdevices) { | |
986 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
987 | return -ENODEV; | |
988 | } | |
989 | ||
990 | s = dev->subdevices + user_cmd.subdev; | |
991 | async = s->async; | |
992 | ||
993 | if (s->type == COMEDI_SUBD_UNUSED) { | |
994 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
995 | return -EIO; | |
996 | } | |
997 | ||
998 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
999 | DPRINTK("subdevice %i does not support commands\n", | |
1000 | user_cmd.subdev); | |
1001 | return -EIO; | |
1002 | } | |
1003 | ||
1004 | /* are we locked? (ioctl lock) */ | |
1005 | if (s->lock && s->lock != file) { | |
1006 | DPRINTK("subdevice locked\n"); | |
1007 | return -EACCES; | |
1008 | } | |
1009 | ||
1010 | /* are we busy? */ | |
1011 | if (s->busy) { | |
1012 | DPRINTK("subdevice busy\n"); | |
1013 | return -EBUSY; | |
1014 | } | |
1015 | s->busy = file; | |
1016 | ||
1017 | /* make sure channel/gain list isn't too long */ | |
1018 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1019 | DPRINTK("channel/gain list too long %u > %d\n", | |
1020 | user_cmd.chanlist_len, s->len_chanlist); | |
1021 | ret = -EINVAL; | |
1022 | goto cleanup; | |
1023 | } | |
1024 | ||
1025 | /* make sure channel/gain list isn't too short */ | |
1026 | if (user_cmd.chanlist_len < 1) { | |
1027 | DPRINTK("channel/gain list too short %u < 1\n", | |
1028 | user_cmd.chanlist_len); | |
1029 | ret = -EINVAL; | |
1030 | goto cleanup; | |
1031 | } | |
1032 | ||
476b8477 | 1033 | kfree(async->cmd.chanlist); |
ed9eccbe DS |
1034 | async->cmd = user_cmd; |
1035 | async->cmd.data = NULL; | |
1036 | /* load channel/gain list */ | |
1037 | async->cmd.chanlist = | |
476b8477 | 1038 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1039 | if (!async->cmd.chanlist) { |
1040 | DPRINTK("allocation failed\n"); | |
1041 | ret = -ENOMEM; | |
1042 | goto cleanup; | |
1043 | } | |
1044 | ||
1045 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, | |
476b8477 | 1046 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1047 | DPRINTK("fault reading chanlist\n"); |
1048 | ret = -EFAULT; | |
1049 | goto cleanup; | |
1050 | } | |
1051 | ||
1052 | /* make sure each element in channel/gain list is valid */ | |
476b8477 GKH |
1053 | ret = check_chanlist(s, async->cmd.chanlist_len, async->cmd.chanlist); |
1054 | if (ret < 0) { | |
ed9eccbe DS |
1055 | DPRINTK("bad chanlist\n"); |
1056 | goto cleanup; | |
1057 | } | |
1058 | ||
1059 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1060 | ||
1061 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1062 | DPRINTK("test returned %d\n", ret); | |
1063 | user_cmd = async->cmd; | |
476b8477 | 1064 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1065 | user_cmd.chanlist = chanlist_saver; |
1066 | user_cmd.data = NULL; | |
ea6d0d4c | 1067 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1068 | DPRINTK("fault writing cmd\n"); |
1069 | ret = -EFAULT; | |
1070 | goto cleanup; | |
1071 | } | |
1072 | ret = -EAGAIN; | |
1073 | goto cleanup; | |
1074 | } | |
1075 | ||
1076 | if (!async->prealloc_bufsz) { | |
1077 | ret = -ENOMEM; | |
1078 | DPRINTK("no buffer (?)\n"); | |
1079 | goto cleanup; | |
1080 | } | |
1081 | ||
1082 | comedi_reset_async_buf(async); | |
1083 | ||
1084 | async->cb_mask = | |
476b8477 GKH |
1085 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1086 | COMEDI_CB_OVERFLOW; | |
1087 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1088 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1089 | |
1090 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1091 | ||
ed9eccbe DS |
1092 | ret = s->do_cmd(dev, s); |
1093 | if (ret == 0) | |
1094 | return 0; | |
1095 | ||
476b8477 | 1096 | cleanup: |
ed9eccbe DS |
1097 | do_become_nonbusy(dev, s); |
1098 | ||
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | COMEDI_CMDTEST | |
1104 | command testing ioctl | |
1105 | ||
1106 | arg: | |
1107 | pointer to cmd structure | |
1108 | ||
1109 | reads: | |
1110 | cmd structure at arg | |
1111 | channel/range list | |
1112 | ||
1113 | writes: | |
1114 | modified cmd structure at arg | |
1115 | ||
1116 | */ | |
71b5f4f1 | 1117 | static int do_cmdtest_ioctl(struct comedi_device *dev, void *arg, void *file) |
ed9eccbe | 1118 | { |
ea6d0d4c | 1119 | struct comedi_cmd user_cmd; |
34c43922 | 1120 | struct comedi_subdevice *s; |
ed9eccbe DS |
1121 | int ret = 0; |
1122 | unsigned int *chanlist = NULL; | |
1123 | unsigned int *chanlist_saver = NULL; | |
1124 | ||
ea6d0d4c | 1125 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1126 | DPRINTK("bad cmd address\n"); |
1127 | return -EFAULT; | |
1128 | } | |
476b8477 | 1129 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1130 | chanlist_saver = user_cmd.chanlist; |
1131 | ||
1132 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1133 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1134 | return -ENODEV; | |
1135 | } | |
1136 | ||
1137 | s = dev->subdevices + user_cmd.subdev; | |
1138 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1139 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1140 | return -EIO; | |
1141 | } | |
1142 | ||
1143 | if (!s->do_cmd || !s->do_cmdtest) { | |
1144 | DPRINTK("subdevice %i does not support commands\n", | |
1145 | user_cmd.subdev); | |
1146 | return -EIO; | |
1147 | } | |
1148 | ||
1149 | /* make sure channel/gain list isn't too long */ | |
1150 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1151 | DPRINTK("channel/gain list too long %d > %d\n", | |
1152 | user_cmd.chanlist_len, s->len_chanlist); | |
1153 | ret = -EINVAL; | |
1154 | goto cleanup; | |
1155 | } | |
1156 | ||
1157 | /* load channel/gain list */ | |
1158 | if (user_cmd.chanlist) { | |
1159 | chanlist = | |
476b8477 | 1160 | kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1161 | if (!chanlist) { |
1162 | DPRINTK("allocation failed\n"); | |
1163 | ret = -ENOMEM; | |
1164 | goto cleanup; | |
1165 | } | |
1166 | ||
1167 | if (copy_from_user(chanlist, user_cmd.chanlist, | |
476b8477 | 1168 | user_cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1169 | DPRINTK("fault reading chanlist\n"); |
1170 | ret = -EFAULT; | |
1171 | goto cleanup; | |
1172 | } | |
1173 | ||
1174 | /* make sure each element in channel/gain list is valid */ | |
476b8477 GKH |
1175 | ret = check_chanlist(s, user_cmd.chanlist_len, chanlist); |
1176 | if (ret < 0) { | |
ed9eccbe DS |
1177 | DPRINTK("bad chanlist\n"); |
1178 | goto cleanup; | |
1179 | } | |
1180 | ||
1181 | user_cmd.chanlist = chanlist; | |
1182 | } | |
1183 | ||
1184 | ret = s->do_cmdtest(dev, s, &user_cmd); | |
1185 | ||
476b8477 | 1186 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1187 | user_cmd.chanlist = chanlist_saver; |
1188 | ||
ea6d0d4c | 1189 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1190 | DPRINTK("bad cmd address\n"); |
1191 | ret = -EFAULT; | |
1192 | goto cleanup; | |
1193 | } | |
476b8477 GKH |
1194 | cleanup: |
1195 | kfree(chanlist); | |
ed9eccbe DS |
1196 | |
1197 | return ret; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | COMEDI_LOCK | |
1202 | lock subdevice | |
1203 | ||
1204 | arg: | |
1205 | subdevice number | |
1206 | ||
1207 | reads: | |
1208 | none | |
1209 | ||
1210 | writes: | |
1211 | none | |
1212 | ||
1213 | */ | |
1214 | ||
0a85b6f0 MT |
1215 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1216 | void *file) | |
ed9eccbe DS |
1217 | { |
1218 | int ret = 0; | |
1219 | unsigned long flags; | |
34c43922 | 1220 | struct comedi_subdevice *s; |
ed9eccbe DS |
1221 | |
1222 | if (arg >= dev->n_subdevices) | |
1223 | return -EINVAL; | |
1224 | s = dev->subdevices + arg; | |
1225 | ||
5f74ea14 | 1226 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1227 | if (s->busy || s->lock) |
ed9eccbe | 1228 | ret = -EBUSY; |
476b8477 | 1229 | else |
ed9eccbe | 1230 | s->lock = file; |
5f74ea14 | 1231 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
1232 | |
1233 | if (ret < 0) | |
1234 | return ret; | |
1235 | ||
1236 | #if 0 | |
1237 | if (s->lock_f) | |
1238 | ret = s->lock_f(dev, s); | |
1239 | #endif | |
1240 | ||
1241 | return ret; | |
1242 | } | |
1243 | ||
1244 | /* | |
1245 | COMEDI_UNLOCK | |
1246 | unlock subdevice | |
1247 | ||
1248 | arg: | |
1249 | subdevice number | |
1250 | ||
1251 | reads: | |
1252 | none | |
1253 | ||
1254 | writes: | |
1255 | none | |
1256 | ||
1257 | This function isn't protected by the semaphore, since | |
1258 | we already own the lock. | |
1259 | */ | |
0a85b6f0 MT |
1260 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1261 | void *file) | |
ed9eccbe | 1262 | { |
34c43922 | 1263 | struct comedi_subdevice *s; |
ed9eccbe DS |
1264 | |
1265 | if (arg >= dev->n_subdevices) | |
1266 | return -EINVAL; | |
1267 | s = dev->subdevices + arg; | |
1268 | ||
1269 | if (s->busy) | |
1270 | return -EBUSY; | |
1271 | ||
1272 | if (s->lock && s->lock != file) | |
1273 | return -EACCES; | |
1274 | ||
1275 | if (s->lock == file) { | |
1276 | #if 0 | |
1277 | if (s->unlock) | |
1278 | s->unlock(dev, s); | |
1279 | #endif | |
1280 | ||
1281 | s->lock = NULL; | |
1282 | } | |
1283 | ||
1284 | return 0; | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | COMEDI_CANCEL | |
1289 | cancel acquisition ioctl | |
1290 | ||
1291 | arg: | |
1292 | subdevice number | |
1293 | ||
1294 | reads: | |
1295 | nothing | |
1296 | ||
1297 | writes: | |
1298 | nothing | |
1299 | ||
1300 | */ | |
0a85b6f0 MT |
1301 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1302 | void *file) | |
ed9eccbe | 1303 | { |
34c43922 | 1304 | struct comedi_subdevice *s; |
ed9eccbe DS |
1305 | |
1306 | if (arg >= dev->n_subdevices) | |
1307 | return -EINVAL; | |
1308 | s = dev->subdevices + arg; | |
1309 | if (s->async == NULL) | |
1310 | return -EINVAL; | |
1311 | ||
1312 | if (s->lock && s->lock != file) | |
1313 | return -EACCES; | |
1314 | ||
1315 | if (!s->busy) | |
1316 | return 0; | |
1317 | ||
1318 | if (s->busy != file) | |
1319 | return -EBUSY; | |
1320 | ||
1321 | return do_cancel(dev, s); | |
1322 | } | |
1323 | ||
1324 | /* | |
1325 | COMEDI_POLL ioctl | |
1326 | instructs driver to synchronize buffers | |
1327 | ||
1328 | arg: | |
1329 | subdevice number | |
1330 | ||
1331 | reads: | |
1332 | nothing | |
1333 | ||
1334 | writes: | |
1335 | nothing | |
1336 | ||
1337 | */ | |
0a85b6f0 MT |
1338 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1339 | void *file) | |
ed9eccbe | 1340 | { |
34c43922 | 1341 | struct comedi_subdevice *s; |
ed9eccbe DS |
1342 | |
1343 | if (arg >= dev->n_subdevices) | |
1344 | return -EINVAL; | |
1345 | s = dev->subdevices + arg; | |
1346 | ||
1347 | if (s->lock && s->lock != file) | |
1348 | return -EACCES; | |
1349 | ||
1350 | if (!s->busy) | |
1351 | return 0; | |
1352 | ||
1353 | if (s->busy != file) | |
1354 | return -EBUSY; | |
1355 | ||
1356 | if (s->poll) | |
1357 | return s->poll(dev, s); | |
1358 | ||
1359 | return -EINVAL; | |
1360 | } | |
1361 | ||
34c43922 | 1362 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
1363 | { |
1364 | int ret = 0; | |
1365 | ||
1366 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) | |
1367 | ret = s->cancel(dev, s); | |
1368 | ||
1369 | do_become_nonbusy(dev, s); | |
1370 | ||
1371 | return ret; | |
1372 | } | |
1373 | ||
1374 | void comedi_unmap(struct vm_area_struct *area) | |
1375 | { | |
d163679c | 1376 | struct comedi_async *async; |
71b5f4f1 | 1377 | struct comedi_device *dev; |
ed9eccbe DS |
1378 | |
1379 | async = area->vm_private_data; | |
1380 | dev = async->subdevice->device; | |
1381 | ||
1382 | mutex_lock(&dev->mutex); | |
1383 | async->mmap_count--; | |
1384 | mutex_unlock(&dev->mutex); | |
1385 | } | |
1386 | ||
1387 | static struct vm_operations_struct comedi_vm_ops = { | |
0a85b6f0 | 1388 | .close = comedi_unmap, |
ed9eccbe DS |
1389 | }; |
1390 | ||
1391 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1392 | { | |
1393 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1394 | struct comedi_device_file_info *dev_file_info = |
1395 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1396 | struct comedi_device *dev = dev_file_info->device; |
d163679c | 1397 | struct comedi_async *async = NULL; |
ed9eccbe DS |
1398 | unsigned long start = vma->vm_start; |
1399 | unsigned long size; | |
1400 | int n_pages; | |
1401 | int i; | |
1402 | int retval; | |
34c43922 | 1403 | struct comedi_subdevice *s; |
ed9eccbe DS |
1404 | |
1405 | mutex_lock(&dev->mutex); | |
1406 | if (!dev->attached) { | |
1407 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1408 | retval = -ENODEV; | |
1409 | goto done; | |
1410 | } | |
476b8477 | 1411 | if (vma->vm_flags & VM_WRITE) |
ed9eccbe | 1412 | s = comedi_get_write_subdevice(dev_file_info); |
476b8477 | 1413 | else |
ed9eccbe | 1414 | s = comedi_get_read_subdevice(dev_file_info); |
476b8477 | 1415 | |
ed9eccbe DS |
1416 | if (s == NULL) { |
1417 | retval = -EINVAL; | |
1418 | goto done; | |
1419 | } | |
1420 | async = s->async; | |
1421 | if (async == NULL) { | |
1422 | retval = -EINVAL; | |
1423 | goto done; | |
1424 | } | |
1425 | ||
1426 | if (vma->vm_pgoff != 0) { | |
1427 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1428 | retval = -EINVAL; | |
1429 | goto done; | |
1430 | } | |
1431 | ||
1432 | size = vma->vm_end - vma->vm_start; | |
1433 | if (size > async->prealloc_bufsz) { | |
1434 | retval = -EFAULT; | |
1435 | goto done; | |
1436 | } | |
1437 | if (size & (~PAGE_MASK)) { | |
1438 | retval = -EFAULT; | |
1439 | goto done; | |
1440 | } | |
1441 | ||
1442 | n_pages = size >> PAGE_SHIFT; | |
1443 | for (i = 0; i < n_pages; ++i) { | |
1444 | if (remap_pfn_range(vma, start, | |
0a85b6f0 MT |
1445 | page_to_pfn(virt_to_page |
1446 | (async->buf_page_list | |
1447 | [i].virt_addr)), PAGE_SIZE, | |
1448 | PAGE_SHARED)) { | |
ed9eccbe DS |
1449 | retval = -EAGAIN; |
1450 | goto done; | |
1451 | } | |
1452 | start += PAGE_SIZE; | |
1453 | } | |
1454 | ||
1455 | vma->vm_ops = &comedi_vm_ops; | |
1456 | vma->vm_private_data = async; | |
1457 | ||
1458 | async->mmap_count++; | |
1459 | ||
1460 | retval = 0; | |
476b8477 | 1461 | done: |
ed9eccbe DS |
1462 | mutex_unlock(&dev->mutex); |
1463 | return retval; | |
1464 | } | |
1465 | ||
0a85b6f0 | 1466 | static unsigned int comedi_poll(struct file *file, poll_table * wait) |
ed9eccbe DS |
1467 | { |
1468 | unsigned int mask = 0; | |
1469 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1470 | struct comedi_device_file_info *dev_file_info = |
1471 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1472 | struct comedi_device *dev = dev_file_info->device; |
34c43922 BP |
1473 | struct comedi_subdevice *read_subdev; |
1474 | struct comedi_subdevice *write_subdev; | |
ed9eccbe DS |
1475 | |
1476 | mutex_lock(&dev->mutex); | |
1477 | if (!dev->attached) { | |
1478 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1479 | mutex_unlock(&dev->mutex); | |
1480 | return 0; | |
1481 | } | |
1482 | ||
1483 | mask = 0; | |
1484 | read_subdev = comedi_get_read_subdevice(dev_file_info); | |
1485 | if (read_subdev) { | |
1486 | poll_wait(file, &read_subdev->async->wait_head, wait); | |
1487 | if (!read_subdev->busy | |
476b8477 GKH |
1488 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
1489 | || !(comedi_get_subdevice_runflags(read_subdev) & | |
1490 | SRF_RUNNING)) { | |
ed9eccbe DS |
1491 | mask |= POLLIN | POLLRDNORM; |
1492 | } | |
1493 | } | |
1494 | write_subdev = comedi_get_write_subdevice(dev_file_info); | |
1495 | if (write_subdev) { | |
1496 | poll_wait(file, &write_subdev->async->wait_head, wait); | |
476b8477 GKH |
1497 | comedi_buf_write_alloc(write_subdev->async, |
1498 | write_subdev->async->prealloc_bufsz); | |
ed9eccbe | 1499 | if (!write_subdev->busy |
476b8477 GKH |
1500 | || !(comedi_get_subdevice_runflags(write_subdev) & |
1501 | SRF_RUNNING) | |
1502 | || comedi_buf_write_n_allocated(write_subdev->async) >= | |
1503 | bytes_per_sample(write_subdev->async->subdevice)) { | |
ed9eccbe DS |
1504 | mask |= POLLOUT | POLLWRNORM; |
1505 | } | |
1506 | } | |
1507 | ||
1508 | mutex_unlock(&dev->mutex); | |
1509 | return mask; | |
1510 | } | |
1511 | ||
1512 | static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes, | |
6705b68d | 1513 | loff_t *offset) |
ed9eccbe | 1514 | { |
34c43922 | 1515 | struct comedi_subdevice *s; |
d163679c | 1516 | struct comedi_async *async; |
ed9eccbe DS |
1517 | int n, m, count = 0, retval = 0; |
1518 | DECLARE_WAITQUEUE(wait, current); | |
1519 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1520 | struct comedi_device_file_info *dev_file_info = |
1521 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1522 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1523 | |
1524 | if (!dev->attached) { | |
1525 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1526 | retval = -ENODEV; | |
1527 | goto done; | |
1528 | } | |
1529 | ||
1530 | s = comedi_get_write_subdevice(dev_file_info); | |
1531 | if (s == NULL) { | |
1532 | retval = -EIO; | |
1533 | goto done; | |
1534 | } | |
1535 | async = s->async; | |
1536 | ||
1537 | if (!nbytes) { | |
1538 | retval = 0; | |
1539 | goto done; | |
1540 | } | |
1541 | if (!s->busy) { | |
1542 | retval = 0; | |
1543 | goto done; | |
1544 | } | |
1545 | if (s->busy != file) { | |
1546 | retval = -EACCES; | |
1547 | goto done; | |
1548 | } | |
1549 | add_wait_queue(&async->wait_head, &wait); | |
1550 | while (nbytes > 0 && !retval) { | |
1551 | set_current_state(TASK_INTERRUPTIBLE); | |
1552 | ||
1553 | n = nbytes; | |
1554 | ||
1555 | m = n; | |
476b8477 | 1556 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1557 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1558 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1559 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1560 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1561 | if (m < n) |
1562 | n = m; | |
1563 | ||
1564 | if (n == 0) { | |
1565 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1566 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1567 | SRF_ERROR) { |
ed9eccbe DS |
1568 | retval = -EPIPE; |
1569 | } else { | |
1570 | retval = 0; | |
1571 | } | |
1572 | do_become_nonbusy(dev, s); | |
1573 | break; | |
1574 | } | |
1575 | if (file->f_flags & O_NONBLOCK) { | |
1576 | retval = -EAGAIN; | |
1577 | break; | |
1578 | } | |
1579 | if (signal_pending(current)) { | |
1580 | retval = -ERESTARTSYS; | |
1581 | break; | |
1582 | } | |
1583 | schedule(); | |
476b8477 | 1584 | if (!s->busy) |
ed9eccbe | 1585 | break; |
ed9eccbe DS |
1586 | if (s->busy != file) { |
1587 | retval = -EACCES; | |
1588 | break; | |
1589 | } | |
1590 | continue; | |
1591 | } | |
1592 | ||
1593 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1594 | buf, n); |
ed9eccbe DS |
1595 | if (m) { |
1596 | n -= m; | |
1597 | retval = -EFAULT; | |
1598 | } | |
1599 | comedi_buf_write_free(async, n); | |
1600 | ||
1601 | count += n; | |
1602 | nbytes -= n; | |
1603 | ||
1604 | buf += n; | |
1605 | break; /* makes device work like a pipe */ | |
1606 | } | |
1607 | set_current_state(TASK_RUNNING); | |
1608 | remove_wait_queue(&async->wait_head, &wait); | |
1609 | ||
1610 | done: | |
476b8477 | 1611 | return count ? count : retval; |
ed9eccbe DS |
1612 | } |
1613 | ||
1614 | static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes, | |
6705b68d | 1615 | loff_t *offset) |
ed9eccbe | 1616 | { |
34c43922 | 1617 | struct comedi_subdevice *s; |
d163679c | 1618 | struct comedi_async *async; |
ed9eccbe DS |
1619 | int n, m, count = 0, retval = 0; |
1620 | DECLARE_WAITQUEUE(wait, current); | |
1621 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1622 | struct comedi_device_file_info *dev_file_info = |
1623 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1624 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1625 | |
1626 | if (!dev->attached) { | |
1627 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1628 | retval = -ENODEV; | |
1629 | goto done; | |
1630 | } | |
1631 | ||
1632 | s = comedi_get_read_subdevice(dev_file_info); | |
1633 | if (s == NULL) { | |
1634 | retval = -EIO; | |
1635 | goto done; | |
1636 | } | |
1637 | async = s->async; | |
1638 | if (!nbytes) { | |
1639 | retval = 0; | |
1640 | goto done; | |
1641 | } | |
1642 | if (!s->busy) { | |
1643 | retval = 0; | |
1644 | goto done; | |
1645 | } | |
1646 | if (s->busy != file) { | |
1647 | retval = -EACCES; | |
1648 | goto done; | |
1649 | } | |
1650 | ||
1651 | add_wait_queue(&async->wait_head, &wait); | |
1652 | while (nbytes > 0 && !retval) { | |
1653 | set_current_state(TASK_INTERRUPTIBLE); | |
1654 | ||
1655 | n = nbytes; | |
1656 | ||
1657 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
1658 | /* printk("%d available\n",m); */ |
1659 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 1660 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 1661 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
1662 | if (m < n) |
1663 | n = m; | |
1664 | ||
1665 | if (n == 0) { | |
1666 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1667 | do_become_nonbusy(dev, s); | |
1668 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1669 | SRF_ERROR) { |
ed9eccbe DS |
1670 | retval = -EPIPE; |
1671 | } else { | |
1672 | retval = 0; | |
1673 | } | |
1674 | break; | |
1675 | } | |
1676 | if (file->f_flags & O_NONBLOCK) { | |
1677 | retval = -EAGAIN; | |
1678 | break; | |
1679 | } | |
1680 | if (signal_pending(current)) { | |
1681 | retval = -ERESTARTSYS; | |
1682 | break; | |
1683 | } | |
1684 | schedule(); | |
1685 | if (!s->busy) { | |
1686 | retval = 0; | |
1687 | break; | |
1688 | } | |
1689 | if (s->busy != file) { | |
1690 | retval = -EACCES; | |
1691 | break; | |
1692 | } | |
1693 | continue; | |
1694 | } | |
1695 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 1696 | async->buf_read_ptr, n); |
ed9eccbe DS |
1697 | if (m) { |
1698 | n -= m; | |
1699 | retval = -EFAULT; | |
1700 | } | |
1701 | ||
1702 | comedi_buf_read_alloc(async, n); | |
1703 | comedi_buf_read_free(async, n); | |
1704 | ||
1705 | count += n; | |
1706 | nbytes -= n; | |
1707 | ||
1708 | buf += n; | |
1709 | break; /* makes device work like a pipe */ | |
1710 | } | |
1711 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && | |
476b8477 | 1712 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
1713 | do_become_nonbusy(dev, s); |
1714 | } | |
1715 | set_current_state(TASK_RUNNING); | |
1716 | remove_wait_queue(&async->wait_head, &wait); | |
1717 | ||
1718 | done: | |
476b8477 | 1719 | return count ? count : retval; |
ed9eccbe DS |
1720 | } |
1721 | ||
1722 | /* | |
1723 | This function restores a subdevice to an idle state. | |
1724 | */ | |
34c43922 | 1725 | void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 1726 | { |
d163679c | 1727 | struct comedi_async *async = s->async; |
ed9eccbe DS |
1728 | |
1729 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
ed9eccbe DS |
1730 | if (async) { |
1731 | comedi_reset_async_buf(async); | |
1732 | async->inttrig = NULL; | |
1733 | } else { | |
476b8477 GKH |
1734 | printk(KERN_ERR |
1735 | "BUG: (?) do_become_nonbusy called with async=0\n"); | |
ed9eccbe DS |
1736 | } |
1737 | ||
1738 | s->busy = NULL; | |
1739 | } | |
1740 | ||
1741 | static int comedi_open(struct inode *inode, struct file *file) | |
1742 | { | |
ed9eccbe | 1743 | const unsigned minor = iminor(inode); |
476b8477 GKH |
1744 | struct comedi_device_file_info *dev_file_info = |
1745 | comedi_get_device_file_info(minor); | |
0a85b6f0 MT |
1746 | struct comedi_device *dev = |
1747 | dev_file_info ? dev_file_info->device : NULL; | |
97920071 | 1748 | |
ed9eccbe DS |
1749 | if (dev == NULL) { |
1750 | DPRINTK("invalid minor number\n"); | |
1751 | return -ENODEV; | |
1752 | } | |
1753 | ||
1754 | /* This is slightly hacky, but we want module autoloading | |
1755 | * to work for root. | |
1756 | * case: user opens device, attached -> ok | |
1757 | * case: user opens device, unattached, in_request_module=0 -> autoload | |
1758 | * case: user opens device, unattached, in_request_module=1 -> fail | |
1759 | * case: root opens device, attached -> ok | |
1760 | * case: root opens device, unattached, in_request_module=1 -> ok | |
1761 | * (typically called from modprobe) | |
1762 | * case: root opens device, unattached, in_request_module=0 -> autoload | |
1763 | * | |
1764 | * The last could be changed to "-> ok", which would deny root | |
1765 | * autoloading. | |
1766 | */ | |
1767 | mutex_lock(&dev->mutex); | |
1768 | if (dev->attached) | |
1769 | goto ok; | |
a8f80e8f | 1770 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
1771 | DPRINTK("in request module\n"); |
1772 | mutex_unlock(&dev->mutex); | |
1773 | return -ENODEV; | |
1774 | } | |
a8f80e8f | 1775 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
1776 | goto ok; |
1777 | ||
1778 | dev->in_request_module = 1; | |
1779 | ||
ed9eccbe DS |
1780 | #ifdef CONFIG_KMOD |
1781 | mutex_unlock(&dev->mutex); | |
56d92c60 | 1782 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
1783 | mutex_lock(&dev->mutex); |
1784 | #endif | |
1785 | ||
1786 | dev->in_request_module = 0; | |
1787 | ||
a8f80e8f EP |
1788 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
1789 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
1790 | mutex_unlock(&dev->mutex); |
1791 | return -ENODEV; | |
1792 | } | |
1793 | ok: | |
1794 | __module_get(THIS_MODULE); | |
1795 | ||
1796 | if (dev->attached) { | |
1797 | if (!try_module_get(dev->driver->module)) { | |
1798 | module_put(THIS_MODULE); | |
1799 | mutex_unlock(&dev->mutex); | |
1800 | return -ENOSYS; | |
1801 | } | |
1802 | } | |
1803 | ||
476b8477 | 1804 | if (dev->attached && dev->use_count == 0 && dev->open) |
ed9eccbe | 1805 | dev->open(dev); |
ed9eccbe DS |
1806 | |
1807 | dev->use_count++; | |
1808 | ||
1809 | mutex_unlock(&dev->mutex); | |
1810 | ||
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | static int comedi_close(struct inode *inode, struct file *file) | |
1815 | { | |
1816 | const unsigned minor = iminor(inode); | |
476b8477 GKH |
1817 | struct comedi_device_file_info *dev_file_info = |
1818 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1819 | struct comedi_device *dev = dev_file_info->device; |
34c43922 | 1820 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
1821 | int i; |
1822 | ||
1823 | mutex_lock(&dev->mutex); | |
1824 | ||
1825 | if (dev->subdevices) { | |
1826 | for (i = 0; i < dev->n_subdevices; i++) { | |
1827 | s = dev->subdevices + i; | |
1828 | ||
476b8477 | 1829 | if (s->busy == file) |
ed9eccbe | 1830 | do_cancel(dev, s); |
476b8477 | 1831 | if (s->lock == file) |
ed9eccbe | 1832 | s->lock = NULL; |
ed9eccbe DS |
1833 | } |
1834 | } | |
476b8477 | 1835 | if (dev->attached && dev->use_count == 1 && dev->close) |
ed9eccbe | 1836 | dev->close(dev); |
ed9eccbe DS |
1837 | |
1838 | module_put(THIS_MODULE); | |
476b8477 | 1839 | if (dev->attached) |
ed9eccbe | 1840 | module_put(dev->driver->module); |
ed9eccbe DS |
1841 | |
1842 | dev->use_count--; | |
1843 | ||
1844 | mutex_unlock(&dev->mutex); | |
1845 | ||
476b8477 | 1846 | if (file->f_flags & FASYNC) |
ed9eccbe | 1847 | comedi_fasync(-1, file, 0); |
ed9eccbe DS |
1848 | |
1849 | return 0; | |
1850 | } | |
1851 | ||
1852 | static int comedi_fasync(int fd, struct file *file, int on) | |
1853 | { | |
1854 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1855 | struct comedi_device_file_info *dev_file_info = |
1856 | comedi_get_device_file_info(minor); | |
1857 | ||
71b5f4f1 | 1858 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1859 | |
1860 | return fasync_helper(fd, file, on, &dev->async_queue); | |
1861 | } | |
1862 | ||
1863 | const struct file_operations comedi_fops = { | |
0a85b6f0 | 1864 | .owner = THIS_MODULE, |
0a85b6f0 | 1865 | .unlocked_ioctl = comedi_unlocked_ioctl, |
0a85b6f0 | 1866 | .compat_ioctl = comedi_compat_ioctl, |
0a85b6f0 MT |
1867 | .open = comedi_open, |
1868 | .release = comedi_close, | |
1869 | .read = comedi_read, | |
1870 | .write = comedi_write, | |
1871 | .mmap = comedi_mmap, | |
1872 | .poll = comedi_poll, | |
1873 | .fasync = comedi_fasync, | |
ed9eccbe DS |
1874 | }; |
1875 | ||
476b8477 | 1876 | struct class *comedi_class; |
ed9eccbe DS |
1877 | static struct cdev comedi_cdev; |
1878 | ||
1879 | static void comedi_cleanup_legacy_minors(void) | |
1880 | { | |
1881 | unsigned i; | |
476b8477 | 1882 | |
1dd33ab8 | 1883 | for (i = 0; i < comedi_num_legacy_minors; i++) |
ed9eccbe | 1884 | comedi_free_board_minor(i); |
ed9eccbe DS |
1885 | } |
1886 | ||
1887 | static int __init comedi_init(void) | |
1888 | { | |
1889 | int i; | |
1890 | int retval; | |
1891 | ||
476b8477 GKH |
1892 | printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
1893 | " - http://www.comedi.org\n"); | |
ed9eccbe | 1894 | |
a3cb729e FMH |
1895 | if (comedi_num_legacy_minors < 0 || |
1896 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
1897 | printk(KERN_ERR "comedi: error: invalid value for module " | |
1898 | "parameter \"comedi_num_legacy_minors\". Valid values " | |
1899 | "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); | |
1900 | return -EINVAL; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * comedi is unusable if both comedi_autoconfig and | |
1905 | * comedi_num_legacy_minors are zero, so we might as well adjust the | |
1906 | * defaults in that case | |
1907 | */ | |
1908 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) | |
1909 | comedi_num_legacy_minors = 16; | |
1910 | ||
476b8477 GKH |
1911 | memset(comedi_file_info_table, 0, |
1912 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); | |
ed9eccbe DS |
1913 | |
1914 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1915 | COMEDI_NUM_MINORS, "comedi"); |
ed9eccbe DS |
1916 | if (retval) |
1917 | return -EIO; | |
1918 | cdev_init(&comedi_cdev, &comedi_fops); | |
1919 | comedi_cdev.owner = THIS_MODULE; | |
1920 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
1921 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
1922 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1923 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1924 | return -EIO; |
1925 | } | |
1926 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
1927 | if (IS_ERR(comedi_class)) { | |
1928 | printk("comedi: failed to create class"); | |
1929 | cdev_del(&comedi_cdev); | |
1930 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1931 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1932 | return PTR_ERR(comedi_class); |
1933 | } | |
1934 | ||
1935 | /* XXX requires /proc interface */ | |
1936 | comedi_proc_init(); | |
1937 | ||
476b8477 | 1938 | /* create devices files for legacy/manual use */ |
1dd33ab8 | 1939 | for (i = 0; i < comedi_num_legacy_minors; i++) { |
ed9eccbe DS |
1940 | int minor; |
1941 | minor = comedi_alloc_board_minor(NULL); | |
476b8477 | 1942 | if (minor < 0) { |
ed9eccbe DS |
1943 | comedi_cleanup_legacy_minors(); |
1944 | cdev_del(&comedi_cdev); | |
1945 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1946 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1947 | return minor; |
1948 | } | |
1949 | } | |
1950 | ||
ed9eccbe DS |
1951 | return 0; |
1952 | } | |
1953 | ||
1954 | static void __exit comedi_cleanup(void) | |
1955 | { | |
1956 | int i; | |
1957 | ||
1958 | comedi_cleanup_legacy_minors(); | |
476b8477 | 1959 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
ed9eccbe | 1960 | BUG_ON(comedi_file_info_table[i]); |
476b8477 | 1961 | |
ed9eccbe DS |
1962 | class_destroy(comedi_class); |
1963 | cdev_del(&comedi_cdev); | |
1964 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
1965 | ||
1966 | comedi_proc_cleanup(); | |
ed9eccbe DS |
1967 | } |
1968 | ||
1969 | module_init(comedi_init); | |
1970 | module_exit(comedi_cleanup); | |
1971 | ||
71b5f4f1 | 1972 | void comedi_error(const struct comedi_device *dev, const char *s) |
ed9eccbe | 1973 | { |
5f74ea14 | 1974 | printk("comedi%d: %s: %s\n", dev->minor, dev->driver->driver_name, s); |
ed9eccbe DS |
1975 | } |
1976 | ||
34c43922 | 1977 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 1978 | { |
d163679c | 1979 | struct comedi_async *async = s->async; |
ed9eccbe DS |
1980 | unsigned runflags = 0; |
1981 | unsigned runflags_mask = 0; | |
1982 | ||
476b8477 | 1983 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
ed9eccbe DS |
1984 | |
1985 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) | |
1986 | return; | |
1987 | ||
0a85b6f0 MT |
1988 | if (s-> |
1989 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
1990 | COMEDI_CB_OVERFLOW)) { | |
ed9eccbe DS |
1991 | runflags_mask |= SRF_RUNNING; |
1992 | } | |
1993 | /* remember if an error event has occured, so an error | |
1994 | * can be returned the next time the user does a read() */ | |
1995 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
1996 | runflags_mask |= SRF_ERROR; | |
1997 | runflags |= SRF_ERROR; | |
1998 | } | |
1999 | if (runflags_mask) { | |
2000 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2001 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
2002 | } | |
2003 | ||
2004 | if (async->cb_mask & s->async->events) { | |
2005 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
fcea1154 | 2006 | wake_up_interruptible(&async->wait_head); |
6705b68d | 2007 | if (s->subdev_flags & SDF_CMD_READ) |
0a85b6f0 | 2008 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
6705b68d | 2009 | if (s->subdev_flags & SDF_CMD_WRITE) |
0a85b6f0 | 2010 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); |
ed9eccbe DS |
2011 | } else { |
2012 | if (async->cb_func) | |
2013 | async->cb_func(s->async->events, async->cb_arg); | |
ed9eccbe DS |
2014 | } |
2015 | } | |
2016 | s->async->events = 0; | |
2017 | } | |
2018 | ||
34c43922 | 2019 | void comedi_set_subdevice_runflags(struct comedi_subdevice *s, unsigned mask, |
476b8477 | 2020 | unsigned bits) |
ed9eccbe DS |
2021 | { |
2022 | unsigned long flags; | |
2023 | ||
5f74ea14 | 2024 | spin_lock_irqsave(&s->spin_lock, flags); |
ed9eccbe DS |
2025 | s->runflags &= ~mask; |
2026 | s->runflags |= (bits & mask); | |
5f74ea14 | 2027 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
2028 | } |
2029 | ||
34c43922 | 2030 | unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
ed9eccbe DS |
2031 | { |
2032 | unsigned long flags; | |
2033 | unsigned runflags; | |
2034 | ||
5f74ea14 | 2035 | spin_lock_irqsave(&s->spin_lock, flags); |
ed9eccbe | 2036 | runflags = s->runflags; |
5f74ea14 | 2037 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
2038 | return runflags; |
2039 | } | |
2040 | ||
71b5f4f1 | 2041 | static int is_device_busy(struct comedi_device *dev) |
ed9eccbe | 2042 | { |
34c43922 | 2043 | struct comedi_subdevice *s; |
ed9eccbe DS |
2044 | int i; |
2045 | ||
2046 | if (!dev->attached) | |
2047 | return 0; | |
2048 | ||
2049 | for (i = 0; i < dev->n_subdevices; i++) { | |
2050 | s = dev->subdevices + i; | |
2051 | if (s->busy) | |
2052 | return 1; | |
2053 | if (s->async && s->async->mmap_count) | |
2054 | return 1; | |
2055 | } | |
2056 | ||
2057 | return 0; | |
2058 | } | |
2059 | ||
71b5f4f1 | 2060 | void comedi_device_init(struct comedi_device *dev) |
ed9eccbe | 2061 | { |
71b5f4f1 | 2062 | memset(dev, 0, sizeof(struct comedi_device)); |
ed9eccbe DS |
2063 | spin_lock_init(&dev->spinlock); |
2064 | mutex_init(&dev->mutex); | |
2065 | dev->minor = -1; | |
2066 | } | |
2067 | ||
71b5f4f1 | 2068 | void comedi_device_cleanup(struct comedi_device *dev) |
ed9eccbe | 2069 | { |
476b8477 GKH |
2070 | if (dev == NULL) |
2071 | return; | |
ed9eccbe DS |
2072 | mutex_lock(&dev->mutex); |
2073 | comedi_device_detach(dev); | |
2074 | mutex_unlock(&dev->mutex); | |
2075 | mutex_destroy(&dev->mutex); | |
2076 | } | |
2077 | ||
2078 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2079 | { | |
2080 | unsigned long flags; | |
2081 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2082 | struct device *csdev; |
ed9eccbe | 2083 | unsigned i; |
883db3d9 | 2084 | int retval; |
ed9eccbe DS |
2085 | |
2086 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2087 | if (info == NULL) |
2088 | return -ENOMEM; | |
71b5f4f1 | 2089 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
476b8477 | 2090 | if (info->device == NULL) { |
ed9eccbe DS |
2091 | kfree(info); |
2092 | return -ENOMEM; | |
2093 | } | |
2094 | comedi_device_init(info->device); | |
5f74ea14 | 2095 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
476b8477 GKH |
2096 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
2097 | if (comedi_file_info_table[i] == NULL) { | |
ed9eccbe DS |
2098 | comedi_file_info_table[i] = info; |
2099 | break; | |
2100 | } | |
2101 | } | |
5f74ea14 | 2102 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2103 | if (i == COMEDI_NUM_BOARD_MINORS) { |
ed9eccbe DS |
2104 | comedi_device_cleanup(info->device); |
2105 | kfree(info->device); | |
2106 | kfree(info); | |
0a85b6f0 MT |
2107 | printk(KERN_ERR |
2108 | "comedi: error: ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2109 | return -EBUSY; |
2110 | } | |
2111 | info->device->minor = i; | |
2112 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, | |
476b8477 GKH |
2113 | MKDEV(COMEDI_MAJOR, i), NULL, |
2114 | hardware_device, "comedi%i", i); | |
2115 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2116 | info->device->class_dev = csdev; |
883db3d9 FMH |
2117 | dev_set_drvdata(csdev, info); |
2118 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2119 | if (retval) { | |
0a85b6f0 MT |
2120 | printk(KERN_ERR |
2121 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2122 | dev_attr_max_read_buffer_kb.attr.name); | |
883db3d9 FMH |
2123 | comedi_free_board_minor(i); |
2124 | return retval; | |
2125 | } | |
2126 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2127 | if (retval) { | |
0a85b6f0 MT |
2128 | printk(KERN_ERR |
2129 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2130 | dev_attr_read_buffer_kb.attr.name); | |
883db3d9 FMH |
2131 | comedi_free_board_minor(i); |
2132 | return retval; | |
2133 | } | |
2134 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2135 | if (retval) { | |
0a85b6f0 MT |
2136 | printk(KERN_ERR |
2137 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2138 | dev_attr_max_write_buffer_kb.attr.name); | |
883db3d9 FMH |
2139 | comedi_free_board_minor(i); |
2140 | return retval; | |
2141 | } | |
2142 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2143 | if (retval) { | |
0a85b6f0 MT |
2144 | printk(KERN_ERR |
2145 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2146 | dev_attr_write_buffer_kb.attr.name); | |
883db3d9 FMH |
2147 | comedi_free_board_minor(i); |
2148 | return retval; | |
2149 | } | |
ed9eccbe DS |
2150 | return i; |
2151 | } | |
2152 | ||
2153 | void comedi_free_board_minor(unsigned minor) | |
2154 | { | |
2155 | unsigned long flags; | |
2156 | struct comedi_device_file_info *info; | |
2157 | ||
2158 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
5f74ea14 | 2159 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2160 | info = comedi_file_info_table[minor]; |
2161 | comedi_file_info_table[minor] = NULL; | |
5f74ea14 | 2162 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2163 | |
476b8477 | 2164 | if (info) { |
71b5f4f1 | 2165 | struct comedi_device *dev = info->device; |
476b8477 GKH |
2166 | if (dev) { |
2167 | if (dev->class_dev) { | |
2168 | device_destroy(comedi_class, | |
2169 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
ed9eccbe DS |
2170 | } |
2171 | comedi_device_cleanup(dev); | |
2172 | kfree(dev); | |
2173 | } | |
2174 | kfree(info); | |
2175 | } | |
2176 | } | |
2177 | ||
883db3d9 FMH |
2178 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
2179 | struct comedi_subdevice *s) | |
ed9eccbe DS |
2180 | { |
2181 | unsigned long flags; | |
2182 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2183 | struct device *csdev; |
ed9eccbe | 2184 | unsigned i; |
883db3d9 | 2185 | int retval; |
ed9eccbe DS |
2186 | |
2187 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2188 | if (info == NULL) |
2189 | return -ENOMEM; | |
ed9eccbe DS |
2190 | info->device = dev; |
2191 | info->read_subdevice = s; | |
2192 | info->write_subdevice = s; | |
5f74ea14 | 2193 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
4c41f3ae | 2194 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { |
476b8477 | 2195 | if (comedi_file_info_table[i] == NULL) { |
ed9eccbe DS |
2196 | comedi_file_info_table[i] = info; |
2197 | break; | |
2198 | } | |
2199 | } | |
5f74ea14 | 2200 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2201 | if (i == COMEDI_NUM_MINORS) { |
ed9eccbe | 2202 | kfree(info); |
0a85b6f0 MT |
2203 | printk(KERN_ERR |
2204 | "comedi: error: ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2205 | return -EBUSY; |
2206 | } | |
2207 | s->minor = i; | |
2208 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, | |
476b8477 GKH |
2209 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
2210 | "comedi%i_subd%i", dev->minor, | |
2211 | (int)(s - dev->subdevices)); | |
2212 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2213 | s->class_dev = csdev; |
883db3d9 FMH |
2214 | dev_set_drvdata(csdev, info); |
2215 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2216 | if (retval) { | |
0a85b6f0 MT |
2217 | printk(KERN_ERR |
2218 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2219 | dev_attr_max_read_buffer_kb.attr.name); | |
883db3d9 FMH |
2220 | comedi_free_subdevice_minor(s); |
2221 | return retval; | |
2222 | } | |
2223 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2224 | if (retval) { | |
0a85b6f0 MT |
2225 | printk(KERN_ERR |
2226 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2227 | dev_attr_read_buffer_kb.attr.name); | |
883db3d9 FMH |
2228 | comedi_free_subdevice_minor(s); |
2229 | return retval; | |
2230 | } | |
2231 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2232 | if (retval) { | |
0a85b6f0 MT |
2233 | printk(KERN_ERR |
2234 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2235 | dev_attr_max_write_buffer_kb.attr.name); | |
883db3d9 FMH |
2236 | comedi_free_subdevice_minor(s); |
2237 | return retval; | |
2238 | } | |
2239 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2240 | if (retval) { | |
0a85b6f0 MT |
2241 | printk(KERN_ERR |
2242 | "comedi: failed to create sysfs attribute file \"%s\".\n", | |
2243 | dev_attr_write_buffer_kb.attr.name); | |
883db3d9 FMH |
2244 | comedi_free_subdevice_minor(s); |
2245 | return retval; | |
2246 | } | |
ed9eccbe DS |
2247 | return i; |
2248 | } | |
2249 | ||
34c43922 | 2250 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
ed9eccbe DS |
2251 | { |
2252 | unsigned long flags; | |
2253 | struct comedi_device_file_info *info; | |
2254 | ||
476b8477 GKH |
2255 | if (s == NULL) |
2256 | return; | |
2257 | if (s->minor < 0) | |
2258 | return; | |
ed9eccbe DS |
2259 | |
2260 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); | |
2261 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
2262 | ||
5f74ea14 | 2263 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2264 | info = comedi_file_info_table[s->minor]; |
2265 | comedi_file_info_table[s->minor] = NULL; | |
5f74ea14 | 2266 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2267 | |
476b8477 | 2268 | if (s->class_dev) { |
ed9eccbe DS |
2269 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
2270 | s->class_dev = NULL; | |
2271 | } | |
2272 | kfree(info); | |
2273 | } | |
2274 | ||
2275 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) | |
2276 | { | |
2277 | unsigned long flags; | |
2278 | struct comedi_device_file_info *info; | |
2279 | ||
2280 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
5f74ea14 | 2281 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2282 | info = comedi_file_info_table[minor]; |
5f74ea14 | 2283 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2284 | return info; |
2285 | } | |
883db3d9 FMH |
2286 | |
2287 | static int resize_async_buffer(struct comedi_device *dev, | |
2288 | struct comedi_subdevice *s, | |
2289 | struct comedi_async *async, unsigned new_size) | |
2290 | { | |
2291 | int retval; | |
2292 | ||
2293 | if (new_size > async->max_bufsize) | |
2294 | return -EPERM; | |
2295 | ||
2296 | if (s->busy) { | |
2297 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
2298 | return -EBUSY; | |
2299 | } | |
2300 | if (async->mmap_count) { | |
2301 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
2302 | return -EBUSY; | |
2303 | } | |
2304 | ||
2305 | if (!async->prealloc_buf) | |
2306 | return -EINVAL; | |
2307 | ||
2308 | /* make sure buffer is an integral number of pages | |
0a85b6f0 | 2309 | * (we round up) */ |
883db3d9 FMH |
2310 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
2311 | ||
2312 | retval = comedi_buf_alloc(dev, s, new_size); | |
2313 | if (retval < 0) | |
2314 | return retval; | |
2315 | ||
2316 | if (s->buf_change) { | |
2317 | retval = s->buf_change(dev, s, new_size); | |
2318 | if (retval < 0) | |
2319 | return retval; | |
2320 | } | |
2321 | ||
2322 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
b8b5cd9f | 2323 | dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); |
883db3d9 FMH |
2324 | return 0; |
2325 | } | |
2326 | ||
2327 | /* sysfs attribute files */ | |
2328 | ||
2329 | static const unsigned bytes_per_kibi = 1024; | |
2330 | ||
2331 | static ssize_t show_max_read_buffer_kb(struct device *dev, | |
2332 | struct device_attribute *attr, char *buf) | |
2333 | { | |
2334 | ssize_t retval; | |
2335 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2336 | unsigned max_buffer_size_kb = 0; | |
2337 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2338 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2339 | |
2340 | mutex_lock(&info->device->mutex); | |
2341 | if (read_subdevice && | |
2342 | (read_subdevice->subdev_flags & SDF_CMD_READ) && | |
2343 | read_subdevice->async) { | |
2344 | max_buffer_size_kb = read_subdevice->async->max_bufsize / | |
0a85b6f0 | 2345 | bytes_per_kibi; |
883db3d9 | 2346 | } |
0a85b6f0 | 2347 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2348 | mutex_unlock(&info->device->mutex); |
2349 | ||
2350 | return retval; | |
2351 | } | |
2352 | ||
2353 | static ssize_t store_max_read_buffer_kb(struct device *dev, | |
2354 | struct device_attribute *attr, | |
2355 | const char *buf, size_t count) | |
2356 | { | |
2357 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2358 | unsigned long new_max_size_kb; | |
2359 | uint64_t new_max_size; | |
2360 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2361 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2362 | |
2363 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2364 | return -EINVAL; | |
0a85b6f0 | 2365 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2366 | return -EINVAL; |
0a85b6f0 MT |
2367 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2368 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2369 | return -EINVAL; |
2370 | ||
2371 | mutex_lock(&info->device->mutex); | |
2372 | if (read_subdevice == NULL || | |
2373 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2374 | read_subdevice->async == NULL) { | |
2375 | mutex_unlock(&info->device->mutex); | |
2376 | return -EINVAL; | |
2377 | } | |
2378 | read_subdevice->async->max_bufsize = new_max_size; | |
2379 | mutex_unlock(&info->device->mutex); | |
2380 | ||
2381 | return count; | |
2382 | } | |
2383 | ||
2384 | static struct device_attribute dev_attr_max_read_buffer_kb = { | |
2385 | .attr = { | |
0a85b6f0 MT |
2386 | .name = "max_read_buffer_kb", |
2387 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2388 | .show = &show_max_read_buffer_kb, |
2389 | .store = &store_max_read_buffer_kb | |
2390 | }; | |
2391 | ||
2392 | static ssize_t show_read_buffer_kb(struct device *dev, | |
2393 | struct device_attribute *attr, char *buf) | |
2394 | { | |
2395 | ssize_t retval; | |
2396 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2397 | unsigned buffer_size_kb = 0; | |
2398 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2399 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2400 | |
2401 | mutex_lock(&info->device->mutex); | |
2402 | if (read_subdevice && | |
0a85b6f0 MT |
2403 | (read_subdevice->subdev_flags & SDF_CMD_READ) && |
2404 | read_subdevice->async) { | |
883db3d9 | 2405 | buffer_size_kb = read_subdevice->async->prealloc_bufsz / |
0a85b6f0 | 2406 | bytes_per_kibi; |
883db3d9 | 2407 | } |
0a85b6f0 | 2408 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2409 | mutex_unlock(&info->device->mutex); |
2410 | ||
2411 | return retval; | |
2412 | } | |
2413 | ||
2414 | static ssize_t store_read_buffer_kb(struct device *dev, | |
2415 | struct device_attribute *attr, | |
2416 | const char *buf, size_t count) | |
2417 | { | |
2418 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2419 | unsigned long new_size_kb; | |
2420 | uint64_t new_size; | |
2421 | int retval; | |
2422 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2423 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2424 | |
2425 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2426 | return -EINVAL; | |
0a85b6f0 | 2427 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2428 | return -EINVAL; |
0a85b6f0 MT |
2429 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2430 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2431 | return -EINVAL; |
2432 | ||
2433 | mutex_lock(&info->device->mutex); | |
2434 | if (read_subdevice == NULL || | |
2435 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2436 | read_subdevice->async == NULL) { | |
2437 | mutex_unlock(&info->device->mutex); | |
2438 | return -EINVAL; | |
2439 | } | |
2440 | retval = resize_async_buffer(info->device, read_subdevice, | |
2441 | read_subdevice->async, new_size); | |
2442 | mutex_unlock(&info->device->mutex); | |
2443 | ||
2444 | if (retval < 0) | |
2445 | return retval; | |
2446 | return count; | |
2447 | } | |
2448 | ||
2449 | static struct device_attribute dev_attr_read_buffer_kb = { | |
2450 | .attr = { | |
0a85b6f0 MT |
2451 | .name = "read_buffer_kb", |
2452 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2453 | .show = &show_read_buffer_kb, |
2454 | .store = &store_read_buffer_kb | |
2455 | }; | |
2456 | ||
2457 | static ssize_t show_max_write_buffer_kb(struct device *dev, | |
2458 | struct device_attribute *attr, | |
2459 | char *buf) | |
2460 | { | |
2461 | ssize_t retval; | |
2462 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2463 | unsigned max_buffer_size_kb = 0; | |
2464 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2465 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2466 | |
2467 | mutex_lock(&info->device->mutex); | |
2468 | if (write_subdevice && | |
2469 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2470 | write_subdevice->async) { | |
2471 | max_buffer_size_kb = write_subdevice->async->max_bufsize / | |
0a85b6f0 | 2472 | bytes_per_kibi; |
883db3d9 | 2473 | } |
0a85b6f0 | 2474 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2475 | mutex_unlock(&info->device->mutex); |
2476 | ||
2477 | return retval; | |
2478 | } | |
2479 | ||
2480 | static ssize_t store_max_write_buffer_kb(struct device *dev, | |
2481 | struct device_attribute *attr, | |
2482 | const char *buf, size_t count) | |
2483 | { | |
2484 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2485 | unsigned long new_max_size_kb; | |
2486 | uint64_t new_max_size; | |
2487 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2488 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2489 | |
2490 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2491 | return -EINVAL; | |
0a85b6f0 | 2492 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2493 | return -EINVAL; |
0a85b6f0 MT |
2494 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2495 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2496 | return -EINVAL; |
2497 | ||
2498 | mutex_lock(&info->device->mutex); | |
2499 | if (write_subdevice == NULL || | |
2500 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2501 | write_subdevice->async == NULL) { | |
2502 | mutex_unlock(&info->device->mutex); | |
2503 | return -EINVAL; | |
2504 | } | |
2505 | write_subdevice->async->max_bufsize = new_max_size; | |
2506 | mutex_unlock(&info->device->mutex); | |
2507 | ||
2508 | return count; | |
2509 | } | |
2510 | ||
2511 | static struct device_attribute dev_attr_max_write_buffer_kb = { | |
2512 | .attr = { | |
0a85b6f0 MT |
2513 | .name = "max_write_buffer_kb", |
2514 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2515 | .show = &show_max_write_buffer_kb, |
2516 | .store = &store_max_write_buffer_kb | |
2517 | }; | |
2518 | ||
2519 | static ssize_t show_write_buffer_kb(struct device *dev, | |
2520 | struct device_attribute *attr, char *buf) | |
2521 | { | |
2522 | ssize_t retval; | |
2523 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2524 | unsigned buffer_size_kb = 0; | |
2525 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2526 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2527 | |
2528 | mutex_lock(&info->device->mutex); | |
2529 | if (write_subdevice && | |
2530 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2531 | write_subdevice->async) { | |
2532 | buffer_size_kb = write_subdevice->async->prealloc_bufsz / | |
0a85b6f0 | 2533 | bytes_per_kibi; |
883db3d9 | 2534 | } |
0a85b6f0 | 2535 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2536 | mutex_unlock(&info->device->mutex); |
2537 | ||
2538 | return retval; | |
2539 | } | |
2540 | ||
2541 | static ssize_t store_write_buffer_kb(struct device *dev, | |
2542 | struct device_attribute *attr, | |
2543 | const char *buf, size_t count) | |
2544 | { | |
2545 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2546 | unsigned long new_size_kb; | |
2547 | uint64_t new_size; | |
2548 | int retval; | |
2549 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2550 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2551 | |
2552 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2553 | return -EINVAL; | |
0a85b6f0 | 2554 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2555 | return -EINVAL; |
0a85b6f0 MT |
2556 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2557 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2558 | return -EINVAL; |
2559 | ||
2560 | mutex_lock(&info->device->mutex); | |
2561 | if (write_subdevice == NULL || | |
2562 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2563 | write_subdevice->async == NULL) { | |
2564 | mutex_unlock(&info->device->mutex); | |
2565 | return -EINVAL; | |
2566 | } | |
2567 | retval = resize_async_buffer(info->device, write_subdevice, | |
0a85b6f0 | 2568 | write_subdevice->async, new_size); |
883db3d9 FMH |
2569 | mutex_unlock(&info->device->mutex); |
2570 | ||
2571 | if (retval < 0) | |
2572 | return retval; | |
2573 | return count; | |
2574 | } | |
2575 | ||
2576 | static struct device_attribute dev_attr_write_buffer_kb = { | |
2577 | .attr = { | |
0a85b6f0 MT |
2578 | .name = "write_buffer_kb", |
2579 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2580 | .show = &show_write_buffer_kb, |
2581 | .store = &store_write_buffer_kb | |
2582 | }; |