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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 | ||
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 | |
242e7ad9 | 52 | #include "internal.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; | |
18736438 | 60 | EXPORT_SYMBOL(comedi_debug); |
ed9eccbe DS |
61 | module_param(comedi_debug, int, 0644); |
62 | #endif | |
63 | ||
6a9d7a21 IA |
64 | int comedi_autoconfig = 1; |
65 | module_param(comedi_autoconfig, bool, 0444); | |
66 | ||
92d0127c | 67 | static int comedi_num_legacy_minors; |
1dd33ab8 BP |
68 | module_param(comedi_num_legacy_minors, int, 0444); |
69 | ||
ed9eccbe | 70 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
476b8477 | 71 | static struct comedi_device_file_info |
0a85b6f0 | 72 | *comedi_file_info_table[COMEDI_NUM_MINORS]; |
476b8477 | 73 | |
0a85b6f0 | 74 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c GKH |
75 | struct comedi_devconfig __user *arg); |
76 | static int do_bufconfig_ioctl(struct comedi_device *dev, | |
77 | struct comedi_bufconfig __user *arg); | |
0a85b6f0 | 78 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
79 | struct comedi_devinfo __user *arg, |
80 | struct file *file); | |
0a85b6f0 | 81 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 82 | struct comedi_subdinfo __user *arg, void *file); |
0a85b6f0 | 83 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
84 | struct comedi_chaninfo __user *arg); |
85 | static int do_bufinfo_ioctl(struct comedi_device *dev, | |
86 | struct comedi_bufinfo __user *arg); | |
87 | static int do_cmd_ioctl(struct comedi_device *dev, | |
88 | struct comedi_cmd __user *arg, void *file); | |
0a85b6f0 MT |
89 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
90 | void *file); | |
91 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, | |
92 | void *file); | |
93 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, | |
94 | void *file); | |
92d0127c GKH |
95 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
96 | struct comedi_cmd __user *arg, void *file); | |
97 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
98 | struct comedi_insnlist __user *arg, void *file); | |
99 | static int do_insn_ioctl(struct comedi_device *dev, | |
100 | struct comedi_insn __user *arg, void *file); | |
0a85b6f0 MT |
101 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd, |
102 | void *file); | |
71b5f4f1 | 103 | |
0a85b6f0 MT |
104 | extern void do_become_nonbusy(struct comedi_device *dev, |
105 | struct comedi_subdevice *s); | |
34c43922 | 106 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); |
ed9eccbe DS |
107 | |
108 | static int comedi_fasync(int fd, struct file *file, int on); | |
109 | ||
71b5f4f1 | 110 | static int is_device_busy(struct comedi_device *dev); |
883db3d9 FMH |
111 | static int resize_async_buffer(struct comedi_device *dev, |
112 | struct comedi_subdevice *s, | |
113 | struct comedi_async *async, unsigned new_size); | |
114 | ||
115 | /* declarations for sysfs attribute files */ | |
116 | static struct device_attribute dev_attr_max_read_buffer_kb; | |
117 | static struct device_attribute dev_attr_read_buffer_kb; | |
118 | static struct device_attribute dev_attr_max_write_buffer_kb; | |
119 | static struct device_attribute dev_attr_write_buffer_kb; | |
ed9eccbe | 120 | |
ed9eccbe | 121 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
476b8477 | 122 | unsigned long arg) |
ed9eccbe DS |
123 | { |
124 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
125 | struct comedi_device_file_info *dev_file_info = |
126 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 127 | struct comedi_device *dev; |
ed9eccbe DS |
128 | int rc; |
129 | ||
53b670a7 FMH |
130 | if (dev_file_info == NULL || dev_file_info->device == NULL) |
131 | return -ENODEV; | |
132 | dev = dev_file_info->device; | |
133 | ||
ed9eccbe DS |
134 | mutex_lock(&dev->mutex); |
135 | ||
136 | /* Device config is special, because it must work on | |
137 | * an unconfigured device. */ | |
138 | if (cmd == COMEDI_DEVCONFIG) { | |
92d0127c GKH |
139 | rc = do_devconfig_ioctl(dev, |
140 | (struct comedi_devconfig __user *)arg); | |
ed9eccbe DS |
141 | goto done; |
142 | } | |
143 | ||
144 | if (!dev->attached) { | |
145 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
146 | rc = -ENODEV; | |
147 | goto done; | |
148 | } | |
149 | ||
150 | switch (cmd) { | |
151 | case COMEDI_BUFCONFIG: | |
92d0127c GKH |
152 | rc = do_bufconfig_ioctl(dev, |
153 | (struct comedi_bufconfig __user *)arg); | |
ed9eccbe DS |
154 | break; |
155 | case COMEDI_DEVINFO: | |
92d0127c GKH |
156 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, |
157 | file); | |
ed9eccbe DS |
158 | break; |
159 | case COMEDI_SUBDINFO: | |
92d0127c GKH |
160 | rc = do_subdinfo_ioctl(dev, |
161 | (struct comedi_subdinfo __user *)arg, | |
162 | file); | |
ed9eccbe DS |
163 | break; |
164 | case COMEDI_CHANINFO: | |
92d0127c | 165 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); |
ed9eccbe DS |
166 | break; |
167 | case COMEDI_RANGEINFO: | |
92d0127c | 168 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); |
ed9eccbe DS |
169 | break; |
170 | case COMEDI_BUFINFO: | |
92d0127c GKH |
171 | rc = do_bufinfo_ioctl(dev, |
172 | (struct comedi_bufinfo __user *)arg); | |
ed9eccbe DS |
173 | break; |
174 | case COMEDI_LOCK: | |
175 | rc = do_lock_ioctl(dev, arg, file); | |
176 | break; | |
177 | case COMEDI_UNLOCK: | |
178 | rc = do_unlock_ioctl(dev, arg, file); | |
179 | break; | |
180 | case COMEDI_CANCEL: | |
181 | rc = do_cancel_ioctl(dev, arg, file); | |
182 | break; | |
183 | case COMEDI_CMD: | |
92d0127c | 184 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); |
ed9eccbe DS |
185 | break; |
186 | case COMEDI_CMDTEST: | |
92d0127c GKH |
187 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, |
188 | file); | |
ed9eccbe DS |
189 | break; |
190 | case COMEDI_INSNLIST: | |
92d0127c GKH |
191 | rc = do_insnlist_ioctl(dev, |
192 | (struct comedi_insnlist __user *)arg, | |
193 | file); | |
ed9eccbe DS |
194 | break; |
195 | case COMEDI_INSN: | |
92d0127c GKH |
196 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, |
197 | file); | |
ed9eccbe DS |
198 | break; |
199 | case COMEDI_POLL: | |
200 | rc = do_poll_ioctl(dev, arg, file); | |
201 | break; | |
202 | default: | |
203 | rc = -ENOTTY; | |
204 | break; | |
205 | } | |
206 | ||
476b8477 | 207 | done: |
ed9eccbe DS |
208 | mutex_unlock(&dev->mutex); |
209 | return rc; | |
210 | } | |
211 | ||
212 | /* | |
213 | COMEDI_DEVCONFIG | |
214 | device config ioctl | |
215 | ||
216 | arg: | |
217 | pointer to devconfig structure | |
218 | ||
219 | reads: | |
220 | devconfig structure at arg | |
221 | ||
222 | writes: | |
223 | none | |
224 | */ | |
0a85b6f0 | 225 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 226 | struct comedi_devconfig __user *arg) |
ed9eccbe | 227 | { |
0707bb04 | 228 | struct comedi_devconfig it; |
ed9eccbe DS |
229 | int ret; |
230 | unsigned char *aux_data = NULL; | |
231 | int aux_len; | |
232 | ||
233 | if (!capable(CAP_SYS_ADMIN)) | |
234 | return -EPERM; | |
235 | ||
236 | if (arg == NULL) { | |
237 | if (is_device_busy(dev)) | |
238 | return -EBUSY; | |
476b8477 | 239 | if (dev->attached) { |
ed9eccbe DS |
240 | struct module *driver_module = dev->driver->module; |
241 | comedi_device_detach(dev); | |
242 | module_put(driver_module); | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
0707bb04 | 247 | if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) |
ed9eccbe DS |
248 | return -EFAULT; |
249 | ||
250 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
251 | ||
252 | if (comedi_aux_data(it.options, 0) && | |
476b8477 | 253 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
ed9eccbe DS |
254 | int bit_shift; |
255 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; | |
256 | if (aux_len < 0) | |
257 | return -EFAULT; | |
258 | ||
259 | aux_data = vmalloc(aux_len); | |
260 | if (!aux_data) | |
261 | return -ENOMEM; | |
262 | ||
263 | if (copy_from_user(aux_data, | |
476b8477 | 264 | comedi_aux_data(it.options, 0), aux_len)) { |
ed9eccbe DS |
265 | vfree(aux_data); |
266 | return -EFAULT; | |
267 | } | |
268 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = | |
476b8477 | 269 | (unsigned long)aux_data; |
ed9eccbe DS |
270 | if (sizeof(void *) > sizeof(int)) { |
271 | bit_shift = sizeof(int) * 8; | |
272 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = | |
476b8477 | 273 | ((unsigned long)aux_data) >> bit_shift; |
ed9eccbe DS |
274 | } else |
275 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; | |
276 | } | |
277 | ||
278 | ret = comedi_device_attach(dev, &it); | |
476b8477 GKH |
279 | if (ret == 0) { |
280 | if (!try_module_get(dev->driver->module)) { | |
ed9eccbe DS |
281 | comedi_device_detach(dev); |
282 | return -ENOSYS; | |
283 | } | |
284 | } | |
285 | ||
286 | if (aux_data) | |
287 | vfree(aux_data); | |
288 | ||
289 | return ret; | |
290 | } | |
291 | ||
292 | /* | |
293 | COMEDI_BUFCONFIG | |
294 | buffer configuration ioctl | |
295 | ||
296 | arg: | |
297 | pointer to bufconfig structure | |
298 | ||
299 | reads: | |
300 | bufconfig at arg | |
301 | ||
302 | writes: | |
303 | modified bufconfig at arg | |
304 | ||
305 | */ | |
92d0127c GKH |
306 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
307 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 308 | { |
be6aba4a | 309 | struct comedi_bufconfig bc; |
d163679c | 310 | struct comedi_async *async; |
34c43922 | 311 | struct comedi_subdevice *s; |
883db3d9 | 312 | int retval = 0; |
ed9eccbe | 313 | |
be6aba4a | 314 | if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
315 | return -EFAULT; |
316 | ||
317 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
318 | return -EINVAL; | |
319 | ||
320 | s = dev->subdevices + bc.subdevice; | |
321 | async = s->async; | |
322 | ||
323 | if (!async) { | |
324 | DPRINTK("subdevice does not have async capability\n"); | |
325 | bc.size = 0; | |
326 | bc.maximum_size = 0; | |
327 | goto copyback; | |
328 | } | |
329 | ||
330 | if (bc.maximum_size) { | |
331 | if (!capable(CAP_SYS_ADMIN)) | |
332 | return -EPERM; | |
333 | ||
334 | async->max_bufsize = bc.maximum_size; | |
335 | } | |
336 | ||
337 | if (bc.size) { | |
883db3d9 FMH |
338 | retval = resize_async_buffer(dev, s, async, bc.size); |
339 | if (retval < 0) | |
340 | return retval; | |
ed9eccbe DS |
341 | } |
342 | ||
343 | bc.size = async->prealloc_bufsz; | |
344 | bc.maximum_size = async->max_bufsize; | |
345 | ||
476b8477 | 346 | copyback: |
be6aba4a | 347 | if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
348 | return -EFAULT; |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | /* | |
354 | COMEDI_DEVINFO | |
355 | device info ioctl | |
356 | ||
357 | arg: | |
358 | pointer to devinfo structure | |
359 | ||
360 | reads: | |
361 | none | |
362 | ||
363 | writes: | |
364 | devinfo structure | |
365 | ||
366 | */ | |
0a85b6f0 | 367 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
368 | struct comedi_devinfo __user *arg, |
369 | struct file *file) | |
ed9eccbe | 370 | { |
063db04b | 371 | struct comedi_devinfo devinfo; |
ed9eccbe | 372 | const unsigned minor = iminor(file->f_dentry->d_inode); |
476b8477 GKH |
373 | struct comedi_device_file_info *dev_file_info = |
374 | comedi_get_device_file_info(minor); | |
34c43922 | 375 | struct comedi_subdevice *read_subdev = |
476b8477 | 376 | comedi_get_read_subdevice(dev_file_info); |
34c43922 | 377 | struct comedi_subdevice *write_subdev = |
476b8477 | 378 | comedi_get_write_subdevice(dev_file_info); |
ed9eccbe DS |
379 | |
380 | memset(&devinfo, 0, sizeof(devinfo)); | |
381 | ||
382 | /* fill devinfo structure */ | |
383 | devinfo.version_code = COMEDI_VERSION_CODE; | |
384 | devinfo.n_subdevs = dev->n_subdevices; | |
385 | memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); | |
386 | memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
387 | ||
476b8477 | 388 | if (read_subdev) |
ed9eccbe | 389 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
476b8477 | 390 | else |
ed9eccbe | 391 | devinfo.read_subdevice = -1; |
476b8477 GKH |
392 | |
393 | if (write_subdev) | |
ed9eccbe | 394 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
476b8477 | 395 | else |
ed9eccbe | 396 | devinfo.write_subdevice = -1; |
ed9eccbe | 397 | |
063db04b | 398 | if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) |
ed9eccbe DS |
399 | return -EFAULT; |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | /* | |
405 | COMEDI_SUBDINFO | |
406 | subdevice info ioctl | |
407 | ||
408 | arg: | |
409 | pointer to array of subdevice info structures | |
410 | ||
411 | reads: | |
412 | none | |
413 | ||
414 | writes: | |
415 | array of subdevice info structures at arg | |
416 | ||
417 | */ | |
0a85b6f0 | 418 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 419 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
420 | { |
421 | int ret, i; | |
bd52efbb | 422 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 423 | struct comedi_subdevice *s; |
ed9eccbe | 424 | |
0a85b6f0 MT |
425 | tmp = |
426 | kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), | |
427 | GFP_KERNEL); | |
ed9eccbe DS |
428 | if (!tmp) |
429 | return -ENOMEM; | |
430 | ||
431 | /* fill subdinfo structs */ | |
432 | for (i = 0; i < dev->n_subdevices; i++) { | |
433 | s = dev->subdevices + i; | |
434 | us = tmp + i; | |
435 | ||
436 | us->type = s->type; | |
437 | us->n_chan = s->n_chan; | |
438 | us->subd_flags = s->subdev_flags; | |
439 | if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) | |
440 | us->subd_flags |= SDF_RUNNING; | |
441 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
442 | us->timer_type = TIMER_nanosec; | |
443 | us->len_chanlist = s->len_chanlist; | |
444 | us->maxdata = s->maxdata; | |
445 | if (s->range_table) { | |
446 | us->range_type = | |
476b8477 | 447 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
448 | } else { |
449 | us->range_type = 0; /* XXX */ | |
450 | } | |
451 | us->flags = s->flags; | |
452 | ||
453 | if (s->busy) | |
454 | us->subd_flags |= SDF_BUSY; | |
455 | if (s->busy == file) | |
456 | us->subd_flags |= SDF_BUSY_OWNER; | |
457 | if (s->lock) | |
458 | us->subd_flags |= SDF_LOCKED; | |
459 | if (s->lock == file) | |
460 | us->subd_flags |= SDF_LOCK_OWNER; | |
461 | if (!s->maxdata && s->maxdata_list) | |
462 | us->subd_flags |= SDF_MAXDATA; | |
463 | if (s->flaglist) | |
464 | us->subd_flags |= SDF_FLAGS; | |
465 | if (s->range_table_list) | |
466 | us->subd_flags |= SDF_RANGETYPE; | |
467 | if (s->do_cmd) | |
468 | us->subd_flags |= SDF_CMD; | |
469 | ||
470 | if (s->insn_bits != &insn_inval) | |
471 | us->insn_bits_support = COMEDI_SUPPORTED; | |
472 | else | |
473 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
474 | ||
475 | us->settling_time_0 = s->settling_time_0; | |
476 | } | |
477 | ||
478 | ret = copy_to_user(arg, tmp, | |
bd52efbb | 479 | dev->n_subdevices * sizeof(struct comedi_subdinfo)); |
ed9eccbe DS |
480 | |
481 | kfree(tmp); | |
482 | ||
483 | return ret ? -EFAULT : 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | COMEDI_CHANINFO | |
488 | subdevice info ioctl | |
489 | ||
490 | arg: | |
491 | pointer to chaninfo structure | |
492 | ||
493 | reads: | |
494 | chaninfo structure at arg | |
495 | ||
496 | writes: | |
497 | arrays at elements of chaninfo structure | |
498 | ||
499 | */ | |
0a85b6f0 | 500 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 501 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 502 | { |
34c43922 | 503 | struct comedi_subdevice *s; |
a18b416d | 504 | struct comedi_chaninfo it; |
ed9eccbe | 505 | |
a18b416d | 506 | if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) |
ed9eccbe DS |
507 | return -EFAULT; |
508 | ||
509 | if (it.subdev >= dev->n_subdevices) | |
510 | return -EINVAL; | |
511 | s = dev->subdevices + it.subdev; | |
512 | ||
513 | if (it.maxdata_list) { | |
514 | if (s->maxdata || !s->maxdata_list) | |
515 | return -EINVAL; | |
516 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 517 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
518 | return -EFAULT; |
519 | } | |
520 | ||
521 | if (it.flaglist) { | |
522 | if (!s->flaglist) | |
523 | return -EINVAL; | |
524 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 525 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
526 | return -EFAULT; |
527 | } | |
528 | ||
529 | if (it.rangelist) { | |
530 | int i; | |
531 | ||
532 | if (!s->range_table_list) | |
533 | return -EINVAL; | |
534 | for (i = 0; i < s->n_chan; i++) { | |
535 | int x; | |
536 | ||
537 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 538 | (s->range_table_list[i]->length); |
ed9eccbe DS |
539 | put_user(x, it.rangelist + i); |
540 | } | |
476b8477 GKH |
541 | #if 0 |
542 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 543 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
544 | return -EFAULT; |
545 | #endif | |
ed9eccbe DS |
546 | } |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | /* | |
552 | COMEDI_BUFINFO | |
553 | buffer information ioctl | |
554 | ||
555 | arg: | |
556 | pointer to bufinfo structure | |
557 | ||
558 | reads: | |
559 | bufinfo at arg | |
560 | ||
561 | writes: | |
562 | modified bufinfo at arg | |
563 | ||
564 | */ | |
92d0127c GKH |
565 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
566 | struct comedi_bufinfo __user *arg) | |
ed9eccbe | 567 | { |
9aa5339a | 568 | struct comedi_bufinfo bi; |
34c43922 | 569 | struct comedi_subdevice *s; |
d163679c | 570 | struct comedi_async *async; |
ed9eccbe | 571 | |
9aa5339a | 572 | if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
573 | return -EFAULT; |
574 | ||
575 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
576 | return -EINVAL; | |
577 | ||
578 | s = dev->subdevices + bi.subdevice; | |
579 | async = s->async; | |
580 | ||
581 | if (!async) { | |
582 | DPRINTK("subdevice does not have async capability\n"); | |
583 | bi.buf_write_ptr = 0; | |
584 | bi.buf_read_ptr = 0; | |
585 | bi.buf_write_count = 0; | |
586 | bi.buf_read_count = 0; | |
4772c018 IA |
587 | bi.bytes_read = 0; |
588 | bi.bytes_written = 0; | |
ed9eccbe DS |
589 | goto copyback; |
590 | } | |
591 | ||
592 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
593 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
594 | comedi_buf_read_free(async, bi.bytes_read); | |
595 | ||
596 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | | |
476b8477 GKH |
597 | SRF_RUNNING)) |
598 | && async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
599 | do_become_nonbusy(dev, s); |
600 | } | |
601 | } | |
602 | ||
603 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
604 | bi.bytes_written = | |
476b8477 | 605 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
606 | comedi_buf_write_free(async, bi.bytes_written); |
607 | } | |
608 | ||
609 | bi.buf_write_count = async->buf_write_count; | |
610 | bi.buf_write_ptr = async->buf_write_ptr; | |
611 | bi.buf_read_count = async->buf_read_count; | |
612 | bi.buf_read_ptr = async->buf_read_ptr; | |
613 | ||
476b8477 | 614 | copyback: |
9aa5339a | 615 | if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
616 | return -EFAULT; |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
0a85b6f0 MT |
621 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
622 | unsigned int *data, void *file); | |
ed9eccbe | 623 | /* |
20617f22 PDP |
624 | * COMEDI_INSNLIST |
625 | * synchronous instructions | |
ed9eccbe | 626 | * |
20617f22 PDP |
627 | * arg: |
628 | * pointer to sync cmd structure | |
ed9eccbe | 629 | * |
20617f22 PDP |
630 | * reads: |
631 | * sync cmd struct at arg | |
632 | * instruction list | |
633 | * data (for writes) | |
ed9eccbe | 634 | * |
20617f22 PDP |
635 | * writes: |
636 | * data (for reads) | |
ed9eccbe DS |
637 | */ |
638 | /* arbitrary limits */ | |
639 | #define MAX_SAMPLES 256 | |
92d0127c GKH |
640 | static int do_insnlist_ioctl(struct comedi_device *dev, |
641 | struct comedi_insnlist __user *arg, void *file) | |
ed9eccbe | 642 | { |
da613f4f | 643 | struct comedi_insnlist insnlist; |
90035c08 | 644 | struct comedi_insn *insns = NULL; |
790c5541 | 645 | unsigned int *data = NULL; |
ed9eccbe DS |
646 | int i = 0; |
647 | int ret = 0; | |
648 | ||
da613f4f | 649 | if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
ed9eccbe DS |
650 | return -EFAULT; |
651 | ||
790c5541 | 652 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
653 | if (!data) { |
654 | DPRINTK("kmalloc failed\n"); | |
655 | ret = -ENOMEM; | |
656 | goto error; | |
657 | } | |
658 | ||
0a85b6f0 MT |
659 | insns = |
660 | kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); | |
ed9eccbe DS |
661 | if (!insns) { |
662 | DPRINTK("kmalloc failed\n"); | |
663 | ret = -ENOMEM; | |
664 | goto error; | |
665 | } | |
666 | ||
667 | if (copy_from_user(insns, insnlist.insns, | |
90035c08 | 668 | sizeof(struct comedi_insn) * insnlist.n_insns)) { |
ed9eccbe DS |
669 | DPRINTK("copy_from_user failed\n"); |
670 | ret = -EFAULT; | |
671 | goto error; | |
672 | } | |
673 | ||
674 | for (i = 0; i < insnlist.n_insns; i++) { | |
675 | if (insns[i].n > MAX_SAMPLES) { | |
676 | DPRINTK("number of samples too large\n"); | |
677 | ret = -EINVAL; | |
678 | goto error; | |
679 | } | |
680 | if (insns[i].insn & INSN_MASK_WRITE) { | |
681 | if (copy_from_user(data, insns[i].data, | |
790c5541 | 682 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
683 | DPRINTK("copy_from_user failed\n"); |
684 | ret = -EFAULT; | |
685 | goto error; | |
686 | } | |
687 | } | |
688 | ret = parse_insn(dev, insns + i, data, file); | |
689 | if (ret < 0) | |
690 | goto error; | |
691 | if (insns[i].insn & INSN_MASK_READ) { | |
692 | if (copy_to_user(insns[i].data, data, | |
790c5541 | 693 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
694 | DPRINTK("copy_to_user failed\n"); |
695 | ret = -EFAULT; | |
696 | goto error; | |
697 | } | |
698 | } | |
699 | if (need_resched()) | |
700 | schedule(); | |
701 | } | |
702 | ||
476b8477 GKH |
703 | error: |
704 | kfree(insns); | |
705 | kfree(data); | |
ed9eccbe DS |
706 | |
707 | if (ret < 0) | |
708 | return ret; | |
709 | return i; | |
710 | } | |
711 | ||
0a85b6f0 MT |
712 | static int check_insn_config_length(struct comedi_insn *insn, |
713 | unsigned int *data) | |
ed9eccbe | 714 | { |
476b8477 GKH |
715 | if (insn->n < 1) |
716 | return -EINVAL; | |
ed9eccbe DS |
717 | |
718 | switch (data[0]) { | |
719 | case INSN_CONFIG_DIO_OUTPUT: | |
720 | case INSN_CONFIG_DIO_INPUT: | |
721 | case INSN_CONFIG_DISARM: | |
722 | case INSN_CONFIG_RESET: | |
723 | if (insn->n == 1) | |
724 | return 0; | |
725 | break; | |
726 | case INSN_CONFIG_ARM: | |
727 | case INSN_CONFIG_DIO_QUERY: | |
728 | case INSN_CONFIG_BLOCK_SIZE: | |
729 | case INSN_CONFIG_FILTER: | |
730 | case INSN_CONFIG_SERIAL_CLOCK: | |
731 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
732 | case INSN_CONFIG_ALT_SOURCE: | |
733 | case INSN_CONFIG_SET_COUNTER_MODE: | |
734 | case INSN_CONFIG_8254_READ_STATUS: | |
735 | case INSN_CONFIG_SET_ROUTING: | |
736 | case INSN_CONFIG_GET_ROUTING: | |
737 | case INSN_CONFIG_GET_PWM_STATUS: | |
738 | case INSN_CONFIG_PWM_SET_PERIOD: | |
739 | case INSN_CONFIG_PWM_GET_PERIOD: | |
740 | if (insn->n == 2) | |
741 | return 0; | |
742 | break; | |
743 | case INSN_CONFIG_SET_GATE_SRC: | |
744 | case INSN_CONFIG_GET_GATE_SRC: | |
745 | case INSN_CONFIG_SET_CLOCK_SRC: | |
746 | case INSN_CONFIG_GET_CLOCK_SRC: | |
747 | case INSN_CONFIG_SET_OTHER_SRC: | |
748 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
749 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
750 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
751 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
752 | if (insn->n == 3) | |
753 | return 0; | |
754 | break; | |
755 | case INSN_CONFIG_PWM_OUTPUT: | |
756 | case INSN_CONFIG_ANALOG_TRIG: | |
757 | if (insn->n == 5) | |
758 | return 0; | |
759 | break; | |
0a85b6f0 MT |
760 | /* by default we allow the insn since we don't have checks for |
761 | * all possible cases yet */ | |
ed9eccbe | 762 | default: |
3fffdf20 MR |
763 | printk(KERN_WARNING |
764 | "comedi: no check for data length of config insn id " | |
0a85b6f0 MT |
765 | "%i is implemented.\n" |
766 | " Add a check to %s in %s.\n" | |
767 | " Assuming n=%i is correct.\n", data[0], __func__, | |
768 | __FILE__, insn->n); | |
ed9eccbe DS |
769 | return 0; |
770 | break; | |
771 | } | |
772 | return -EINVAL; | |
773 | } | |
774 | ||
0a85b6f0 MT |
775 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
776 | unsigned int *data, void *file) | |
ed9eccbe | 777 | { |
34c43922 | 778 | struct comedi_subdevice *s; |
ed9eccbe DS |
779 | int ret = 0; |
780 | int i; | |
781 | ||
782 | if (insn->insn & INSN_MASK_SPECIAL) { | |
783 | /* a non-subdevice instruction */ | |
784 | ||
785 | switch (insn->insn) { | |
786 | case INSN_GTOD: | |
787 | { | |
788 | struct timeval tv; | |
789 | ||
790 | if (insn->n != 2) { | |
791 | ret = -EINVAL; | |
792 | break; | |
793 | } | |
794 | ||
795 | do_gettimeofday(&tv); | |
796 | data[0] = tv.tv_sec; | |
797 | data[1] = tv.tv_usec; | |
798 | ret = 2; | |
799 | ||
800 | break; | |
801 | } | |
802 | case INSN_WAIT: | |
803 | if (insn->n != 1 || data[0] >= 100000) { | |
804 | ret = -EINVAL; | |
805 | break; | |
806 | } | |
807 | udelay(data[0] / 1000); | |
808 | ret = 1; | |
809 | break; | |
810 | case INSN_INTTRIG: | |
811 | if (insn->n != 1) { | |
812 | ret = -EINVAL; | |
813 | break; | |
814 | } | |
815 | if (insn->subdev >= dev->n_subdevices) { | |
816 | DPRINTK("%d not usable subdevice\n", | |
817 | insn->subdev); | |
818 | ret = -EINVAL; | |
819 | break; | |
820 | } | |
821 | s = dev->subdevices + insn->subdev; | |
822 | if (!s->async) { | |
823 | DPRINTK("no async\n"); | |
824 | ret = -EINVAL; | |
825 | break; | |
826 | } | |
827 | if (!s->async->inttrig) { | |
828 | DPRINTK("no inttrig\n"); | |
829 | ret = -EAGAIN; | |
830 | break; | |
831 | } | |
832 | ret = s->async->inttrig(dev, s, insn->data[0]); | |
833 | if (ret >= 0) | |
834 | ret = 1; | |
835 | break; | |
836 | default: | |
837 | DPRINTK("invalid insn\n"); | |
838 | ret = -EINVAL; | |
839 | break; | |
840 | } | |
841 | } else { | |
842 | /* a subdevice instruction */ | |
790c5541 | 843 | unsigned int maxdata; |
ed9eccbe DS |
844 | |
845 | if (insn->subdev >= dev->n_subdevices) { | |
846 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
847 | ret = -EINVAL; | |
848 | goto out; | |
849 | } | |
850 | s = dev->subdevices + insn->subdev; | |
851 | ||
852 | if (s->type == COMEDI_SUBD_UNUSED) { | |
853 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
854 | ret = -EIO; | |
855 | goto out; | |
856 | } | |
857 | ||
858 | /* are we locked? (ioctl lock) */ | |
859 | if (s->lock && s->lock != file) { | |
860 | DPRINTK("device locked\n"); | |
861 | ret = -EACCES; | |
862 | goto out; | |
863 | } | |
864 | ||
0fd0ca75 | 865 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 866 | if (ret < 0) { |
ed9eccbe DS |
867 | ret = -EINVAL; |
868 | DPRINTK("bad chanspec\n"); | |
869 | goto out; | |
870 | } | |
871 | ||
872 | if (s->busy) { | |
873 | ret = -EBUSY; | |
874 | goto out; | |
875 | } | |
876 | /* This looks arbitrary. It is. */ | |
877 | s->busy = &parse_insn; | |
878 | switch (insn->insn) { | |
879 | case INSN_READ: | |
880 | ret = s->insn_read(dev, s, insn, data); | |
881 | break; | |
882 | case INSN_WRITE: | |
883 | maxdata = s->maxdata_list | |
476b8477 GKH |
884 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
885 | : s->maxdata; | |
ed9eccbe DS |
886 | for (i = 0; i < insn->n; ++i) { |
887 | if (data[i] > maxdata) { | |
888 | ret = -EINVAL; | |
889 | DPRINTK("bad data value(s)\n"); | |
890 | break; | |
891 | } | |
892 | } | |
893 | if (ret == 0) | |
894 | ret = s->insn_write(dev, s, insn, data); | |
895 | break; | |
896 | case INSN_BITS: | |
897 | if (insn->n != 2) { | |
898 | ret = -EINVAL; | |
899 | break; | |
900 | } | |
901 | ret = s->insn_bits(dev, s, insn, data); | |
902 | break; | |
903 | case INSN_CONFIG: | |
904 | ret = check_insn_config_length(insn, data); | |
905 | if (ret) | |
906 | break; | |
907 | ret = s->insn_config(dev, s, insn, data); | |
908 | break; | |
909 | default: | |
910 | ret = -EINVAL; | |
911 | break; | |
912 | } | |
913 | ||
914 | s->busy = NULL; | |
915 | } | |
916 | ||
476b8477 | 917 | out: |
ed9eccbe DS |
918 | return ret; |
919 | } | |
920 | ||
921 | /* | |
20617f22 PDP |
922 | * COMEDI_INSN |
923 | * synchronous instructions | |
ed9eccbe | 924 | * |
20617f22 PDP |
925 | * arg: |
926 | * pointer to insn | |
ed9eccbe | 927 | * |
20617f22 PDP |
928 | * reads: |
929 | * struct comedi_insn struct at arg | |
930 | * data (for writes) | |
ed9eccbe | 931 | * |
20617f22 PDP |
932 | * writes: |
933 | * data (for reads) | |
ed9eccbe | 934 | */ |
92d0127c GKH |
935 | static int do_insn_ioctl(struct comedi_device *dev, |
936 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 937 | { |
90035c08 | 938 | struct comedi_insn insn; |
790c5541 | 939 | unsigned int *data = NULL; |
ed9eccbe DS |
940 | int ret = 0; |
941 | ||
790c5541 | 942 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
943 | if (!data) { |
944 | ret = -ENOMEM; | |
945 | goto error; | |
946 | } | |
947 | ||
90035c08 | 948 | if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
ed9eccbe DS |
949 | ret = -EFAULT; |
950 | goto error; | |
951 | } | |
952 | ||
953 | /* This is where the behavior of insn and insnlist deviate. */ | |
954 | if (insn.n > MAX_SAMPLES) | |
955 | insn.n = MAX_SAMPLES; | |
956 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
957 | if (copy_from_user(data, |
958 | insn.data, | |
959 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
960 | ret = -EFAULT; |
961 | goto error; | |
962 | } | |
963 | } | |
964 | ret = parse_insn(dev, &insn, data, file); | |
965 | if (ret < 0) | |
966 | goto error; | |
967 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
968 | if (copy_to_user(insn.data, |
969 | data, | |
970 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
971 | ret = -EFAULT; |
972 | goto error; | |
973 | } | |
974 | } | |
975 | ret = insn.n; | |
976 | ||
476b8477 GKH |
977 | error: |
978 | kfree(data); | |
ed9eccbe DS |
979 | |
980 | return ret; | |
981 | } | |
982 | ||
181bd67b GKH |
983 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
984 | unsigned mask, unsigned bits) | |
985 | { | |
986 | unsigned long flags; | |
987 | ||
988 | spin_lock_irqsave(&s->spin_lock, flags); | |
989 | s->runflags &= ~mask; | |
990 | s->runflags |= (bits & mask); | |
991 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
992 | } | |
993 | ||
92d0127c GKH |
994 | static int do_cmd_ioctl(struct comedi_device *dev, |
995 | struct comedi_cmd __user *cmd, void *file) | |
ed9eccbe | 996 | { |
ea6d0d4c | 997 | struct comedi_cmd user_cmd; |
34c43922 | 998 | struct comedi_subdevice *s; |
d163679c | 999 | struct comedi_async *async; |
ed9eccbe | 1000 | int ret = 0; |
92d0127c | 1001 | unsigned int __user *chanlist_saver = NULL; |
ed9eccbe | 1002 | |
92d0127c | 1003 | if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1004 | DPRINTK("bad cmd address\n"); |
1005 | return -EFAULT; | |
1006 | } | |
476b8477 | 1007 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1008 | chanlist_saver = user_cmd.chanlist; |
1009 | ||
1010 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1011 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1012 | return -ENODEV; | |
1013 | } | |
1014 | ||
1015 | s = dev->subdevices + user_cmd.subdev; | |
1016 | async = s->async; | |
1017 | ||
1018 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1019 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1020 | return -EIO; | |
1021 | } | |
1022 | ||
1023 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1024 | DPRINTK("subdevice %i does not support commands\n", | |
1025 | user_cmd.subdev); | |
1026 | return -EIO; | |
1027 | } | |
1028 | ||
1029 | /* are we locked? (ioctl lock) */ | |
1030 | if (s->lock && s->lock != file) { | |
1031 | DPRINTK("subdevice locked\n"); | |
1032 | return -EACCES; | |
1033 | } | |
1034 | ||
1035 | /* are we busy? */ | |
1036 | if (s->busy) { | |
1037 | DPRINTK("subdevice busy\n"); | |
1038 | return -EBUSY; | |
1039 | } | |
1040 | s->busy = file; | |
1041 | ||
1042 | /* make sure channel/gain list isn't too long */ | |
1043 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1044 | DPRINTK("channel/gain list too long %u > %d\n", | |
1045 | user_cmd.chanlist_len, s->len_chanlist); | |
1046 | ret = -EINVAL; | |
1047 | goto cleanup; | |
1048 | } | |
1049 | ||
1050 | /* make sure channel/gain list isn't too short */ | |
1051 | if (user_cmd.chanlist_len < 1) { | |
1052 | DPRINTK("channel/gain list too short %u < 1\n", | |
1053 | user_cmd.chanlist_len); | |
1054 | ret = -EINVAL; | |
1055 | goto cleanup; | |
1056 | } | |
1057 | ||
476b8477 | 1058 | kfree(async->cmd.chanlist); |
ed9eccbe DS |
1059 | async->cmd = user_cmd; |
1060 | async->cmd.data = NULL; | |
1061 | /* load channel/gain list */ | |
1062 | async->cmd.chanlist = | |
476b8477 | 1063 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1064 | if (!async->cmd.chanlist) { |
1065 | DPRINTK("allocation failed\n"); | |
1066 | ret = -ENOMEM; | |
1067 | goto cleanup; | |
1068 | } | |
1069 | ||
1070 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, | |
476b8477 | 1071 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1072 | DPRINTK("fault reading chanlist\n"); |
1073 | ret = -EFAULT; | |
1074 | goto cleanup; | |
1075 | } | |
1076 | ||
1077 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1078 | ret = comedi_check_chanlist(s, |
1079 | async->cmd.chanlist_len, | |
1080 | async->cmd.chanlist); | |
476b8477 | 1081 | if (ret < 0) { |
ed9eccbe DS |
1082 | DPRINTK("bad chanlist\n"); |
1083 | goto cleanup; | |
1084 | } | |
1085 | ||
1086 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1087 | ||
1088 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1089 | DPRINTK("test returned %d\n", ret); | |
1090 | user_cmd = async->cmd; | |
476b8477 | 1091 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1092 | user_cmd.chanlist = chanlist_saver; |
1093 | user_cmd.data = NULL; | |
92d0127c | 1094 | if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1095 | DPRINTK("fault writing cmd\n"); |
1096 | ret = -EFAULT; | |
1097 | goto cleanup; | |
1098 | } | |
1099 | ret = -EAGAIN; | |
1100 | goto cleanup; | |
1101 | } | |
1102 | ||
1103 | if (!async->prealloc_bufsz) { | |
1104 | ret = -ENOMEM; | |
1105 | DPRINTK("no buffer (?)\n"); | |
1106 | goto cleanup; | |
1107 | } | |
1108 | ||
1109 | comedi_reset_async_buf(async); | |
1110 | ||
1111 | async->cb_mask = | |
476b8477 GKH |
1112 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1113 | COMEDI_CB_OVERFLOW; | |
1114 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1115 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1116 | |
1117 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1118 | ||
ed9eccbe DS |
1119 | ret = s->do_cmd(dev, s); |
1120 | if (ret == 0) | |
1121 | return 0; | |
1122 | ||
476b8477 | 1123 | cleanup: |
ed9eccbe DS |
1124 | do_become_nonbusy(dev, s); |
1125 | ||
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | COMEDI_CMDTEST | |
1131 | command testing ioctl | |
1132 | ||
1133 | arg: | |
1134 | pointer to cmd structure | |
1135 | ||
1136 | reads: | |
1137 | cmd structure at arg | |
1138 | channel/range list | |
1139 | ||
1140 | writes: | |
1141 | modified cmd structure at arg | |
1142 | ||
1143 | */ | |
92d0127c GKH |
1144 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1145 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1146 | { |
ea6d0d4c | 1147 | struct comedi_cmd user_cmd; |
34c43922 | 1148 | struct comedi_subdevice *s; |
ed9eccbe DS |
1149 | int ret = 0; |
1150 | unsigned int *chanlist = NULL; | |
92d0127c | 1151 | unsigned int __user *chanlist_saver = NULL; |
ed9eccbe | 1152 | |
ea6d0d4c | 1153 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1154 | DPRINTK("bad cmd address\n"); |
1155 | return -EFAULT; | |
1156 | } | |
476b8477 | 1157 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1158 | chanlist_saver = user_cmd.chanlist; |
1159 | ||
1160 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1161 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1162 | return -ENODEV; | |
1163 | } | |
1164 | ||
1165 | s = dev->subdevices + user_cmd.subdev; | |
1166 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1167 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1168 | return -EIO; | |
1169 | } | |
1170 | ||
1171 | if (!s->do_cmd || !s->do_cmdtest) { | |
1172 | DPRINTK("subdevice %i does not support commands\n", | |
1173 | user_cmd.subdev); | |
1174 | return -EIO; | |
1175 | } | |
1176 | ||
1177 | /* make sure channel/gain list isn't too long */ | |
1178 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1179 | DPRINTK("channel/gain list too long %d > %d\n", | |
1180 | user_cmd.chanlist_len, s->len_chanlist); | |
1181 | ret = -EINVAL; | |
1182 | goto cleanup; | |
1183 | } | |
1184 | ||
1185 | /* load channel/gain list */ | |
1186 | if (user_cmd.chanlist) { | |
1187 | chanlist = | |
476b8477 | 1188 | kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1189 | if (!chanlist) { |
1190 | DPRINTK("allocation failed\n"); | |
1191 | ret = -ENOMEM; | |
1192 | goto cleanup; | |
1193 | } | |
1194 | ||
1195 | if (copy_from_user(chanlist, user_cmd.chanlist, | |
476b8477 | 1196 | user_cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1197 | DPRINTK("fault reading chanlist\n"); |
1198 | ret = -EFAULT; | |
1199 | goto cleanup; | |
1200 | } | |
1201 | ||
1202 | /* make sure each element in channel/gain list is valid */ | |
0fd0ca75 | 1203 | ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); |
476b8477 | 1204 | if (ret < 0) { |
ed9eccbe DS |
1205 | DPRINTK("bad chanlist\n"); |
1206 | goto cleanup; | |
1207 | } | |
1208 | ||
1209 | user_cmd.chanlist = chanlist; | |
1210 | } | |
1211 | ||
1212 | ret = s->do_cmdtest(dev, s, &user_cmd); | |
1213 | ||
476b8477 | 1214 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1215 | user_cmd.chanlist = chanlist_saver; |
1216 | ||
ea6d0d4c | 1217 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1218 | DPRINTK("bad cmd address\n"); |
1219 | ret = -EFAULT; | |
1220 | goto cleanup; | |
1221 | } | |
476b8477 GKH |
1222 | cleanup: |
1223 | kfree(chanlist); | |
ed9eccbe DS |
1224 | |
1225 | return ret; | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | COMEDI_LOCK | |
1230 | lock subdevice | |
1231 | ||
1232 | arg: | |
1233 | subdevice number | |
1234 | ||
1235 | reads: | |
1236 | none | |
1237 | ||
1238 | writes: | |
1239 | none | |
1240 | ||
1241 | */ | |
1242 | ||
0a85b6f0 MT |
1243 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1244 | void *file) | |
ed9eccbe DS |
1245 | { |
1246 | int ret = 0; | |
1247 | unsigned long flags; | |
34c43922 | 1248 | struct comedi_subdevice *s; |
ed9eccbe DS |
1249 | |
1250 | if (arg >= dev->n_subdevices) | |
1251 | return -EINVAL; | |
1252 | s = dev->subdevices + arg; | |
1253 | ||
5f74ea14 | 1254 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1255 | if (s->busy || s->lock) |
ed9eccbe | 1256 | ret = -EBUSY; |
476b8477 | 1257 | else |
ed9eccbe | 1258 | s->lock = file; |
5f74ea14 | 1259 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
1260 | |
1261 | if (ret < 0) | |
1262 | return ret; | |
1263 | ||
1264 | #if 0 | |
1265 | if (s->lock_f) | |
1266 | ret = s->lock_f(dev, s); | |
1267 | #endif | |
1268 | ||
1269 | return ret; | |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | COMEDI_UNLOCK | |
1274 | unlock subdevice | |
1275 | ||
1276 | arg: | |
1277 | subdevice number | |
1278 | ||
1279 | reads: | |
1280 | none | |
1281 | ||
1282 | writes: | |
1283 | none | |
1284 | ||
1285 | This function isn't protected by the semaphore, since | |
1286 | we already own the lock. | |
1287 | */ | |
0a85b6f0 MT |
1288 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1289 | void *file) | |
ed9eccbe | 1290 | { |
34c43922 | 1291 | struct comedi_subdevice *s; |
ed9eccbe DS |
1292 | |
1293 | if (arg >= dev->n_subdevices) | |
1294 | return -EINVAL; | |
1295 | s = dev->subdevices + arg; | |
1296 | ||
1297 | if (s->busy) | |
1298 | return -EBUSY; | |
1299 | ||
1300 | if (s->lock && s->lock != file) | |
1301 | return -EACCES; | |
1302 | ||
1303 | if (s->lock == file) { | |
1304 | #if 0 | |
1305 | if (s->unlock) | |
1306 | s->unlock(dev, s); | |
1307 | #endif | |
1308 | ||
1309 | s->lock = NULL; | |
1310 | } | |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | /* | |
1316 | COMEDI_CANCEL | |
1317 | cancel acquisition ioctl | |
1318 | ||
1319 | arg: | |
1320 | subdevice number | |
1321 | ||
1322 | reads: | |
1323 | nothing | |
1324 | ||
1325 | writes: | |
1326 | nothing | |
1327 | ||
1328 | */ | |
0a85b6f0 MT |
1329 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1330 | void *file) | |
ed9eccbe | 1331 | { |
34c43922 | 1332 | struct comedi_subdevice *s; |
ed9eccbe DS |
1333 | |
1334 | if (arg >= dev->n_subdevices) | |
1335 | return -EINVAL; | |
1336 | s = dev->subdevices + arg; | |
1337 | if (s->async == NULL) | |
1338 | return -EINVAL; | |
1339 | ||
1340 | if (s->lock && s->lock != file) | |
1341 | return -EACCES; | |
1342 | ||
1343 | if (!s->busy) | |
1344 | return 0; | |
1345 | ||
1346 | if (s->busy != file) | |
1347 | return -EBUSY; | |
1348 | ||
1349 | return do_cancel(dev, s); | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | COMEDI_POLL ioctl | |
1354 | instructs driver to synchronize buffers | |
1355 | ||
1356 | arg: | |
1357 | subdevice number | |
1358 | ||
1359 | reads: | |
1360 | nothing | |
1361 | ||
1362 | writes: | |
1363 | nothing | |
1364 | ||
1365 | */ | |
0a85b6f0 MT |
1366 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1367 | void *file) | |
ed9eccbe | 1368 | { |
34c43922 | 1369 | struct comedi_subdevice *s; |
ed9eccbe DS |
1370 | |
1371 | if (arg >= dev->n_subdevices) | |
1372 | return -EINVAL; | |
1373 | s = dev->subdevices + arg; | |
1374 | ||
1375 | if (s->lock && s->lock != file) | |
1376 | return -EACCES; | |
1377 | ||
1378 | if (!s->busy) | |
1379 | return 0; | |
1380 | ||
1381 | if (s->busy != file) | |
1382 | return -EBUSY; | |
1383 | ||
1384 | if (s->poll) | |
1385 | return s->poll(dev, s); | |
1386 | ||
1387 | return -EINVAL; | |
1388 | } | |
1389 | ||
34c43922 | 1390 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
1391 | { |
1392 | int ret = 0; | |
1393 | ||
1394 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) | |
1395 | ret = s->cancel(dev, s); | |
1396 | ||
1397 | do_become_nonbusy(dev, s); | |
1398 | ||
1399 | return ret; | |
1400 | } | |
1401 | ||
92d0127c | 1402 | static void comedi_unmap(struct vm_area_struct *area) |
ed9eccbe | 1403 | { |
d163679c | 1404 | struct comedi_async *async; |
71b5f4f1 | 1405 | struct comedi_device *dev; |
ed9eccbe DS |
1406 | |
1407 | async = area->vm_private_data; | |
1408 | dev = async->subdevice->device; | |
1409 | ||
1410 | mutex_lock(&dev->mutex); | |
1411 | async->mmap_count--; | |
1412 | mutex_unlock(&dev->mutex); | |
1413 | } | |
1414 | ||
1415 | static struct vm_operations_struct comedi_vm_ops = { | |
0a85b6f0 | 1416 | .close = comedi_unmap, |
ed9eccbe DS |
1417 | }; |
1418 | ||
1419 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1420 | { | |
1421 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1422 | struct comedi_device_file_info *dev_file_info = |
1423 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1424 | struct comedi_device *dev = dev_file_info->device; |
d163679c | 1425 | struct comedi_async *async = NULL; |
ed9eccbe DS |
1426 | unsigned long start = vma->vm_start; |
1427 | unsigned long size; | |
1428 | int n_pages; | |
1429 | int i; | |
1430 | int retval; | |
34c43922 | 1431 | struct comedi_subdevice *s; |
ed9eccbe DS |
1432 | |
1433 | mutex_lock(&dev->mutex); | |
1434 | if (!dev->attached) { | |
1435 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1436 | retval = -ENODEV; | |
1437 | goto done; | |
1438 | } | |
476b8477 | 1439 | if (vma->vm_flags & VM_WRITE) |
ed9eccbe | 1440 | s = comedi_get_write_subdevice(dev_file_info); |
476b8477 | 1441 | else |
ed9eccbe | 1442 | s = comedi_get_read_subdevice(dev_file_info); |
476b8477 | 1443 | |
ed9eccbe DS |
1444 | if (s == NULL) { |
1445 | retval = -EINVAL; | |
1446 | goto done; | |
1447 | } | |
1448 | async = s->async; | |
1449 | if (async == NULL) { | |
1450 | retval = -EINVAL; | |
1451 | goto done; | |
1452 | } | |
1453 | ||
1454 | if (vma->vm_pgoff != 0) { | |
1455 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1456 | retval = -EINVAL; | |
1457 | goto done; | |
1458 | } | |
1459 | ||
1460 | size = vma->vm_end - vma->vm_start; | |
1461 | if (size > async->prealloc_bufsz) { | |
1462 | retval = -EFAULT; | |
1463 | goto done; | |
1464 | } | |
1465 | if (size & (~PAGE_MASK)) { | |
1466 | retval = -EFAULT; | |
1467 | goto done; | |
1468 | } | |
1469 | ||
1470 | n_pages = size >> PAGE_SHIFT; | |
1471 | for (i = 0; i < n_pages; ++i) { | |
1472 | if (remap_pfn_range(vma, start, | |
0a85b6f0 MT |
1473 | page_to_pfn(virt_to_page |
1474 | (async->buf_page_list | |
1475 | [i].virt_addr)), PAGE_SIZE, | |
1476 | PAGE_SHARED)) { | |
ed9eccbe DS |
1477 | retval = -EAGAIN; |
1478 | goto done; | |
1479 | } | |
1480 | start += PAGE_SIZE; | |
1481 | } | |
1482 | ||
1483 | vma->vm_ops = &comedi_vm_ops; | |
1484 | vma->vm_private_data = async; | |
1485 | ||
1486 | async->mmap_count++; | |
1487 | ||
1488 | retval = 0; | |
476b8477 | 1489 | done: |
ed9eccbe DS |
1490 | mutex_unlock(&dev->mutex); |
1491 | return retval; | |
1492 | } | |
1493 | ||
0a85b6f0 | 1494 | static unsigned int comedi_poll(struct file *file, poll_table * wait) |
ed9eccbe DS |
1495 | { |
1496 | unsigned int mask = 0; | |
1497 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1498 | struct comedi_device_file_info *dev_file_info = |
1499 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1500 | struct comedi_device *dev = dev_file_info->device; |
34c43922 BP |
1501 | struct comedi_subdevice *read_subdev; |
1502 | struct comedi_subdevice *write_subdev; | |
ed9eccbe DS |
1503 | |
1504 | mutex_lock(&dev->mutex); | |
1505 | if (!dev->attached) { | |
1506 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1507 | mutex_unlock(&dev->mutex); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | mask = 0; | |
1512 | read_subdev = comedi_get_read_subdevice(dev_file_info); | |
1513 | if (read_subdev) { | |
1514 | poll_wait(file, &read_subdev->async->wait_head, wait); | |
1515 | if (!read_subdev->busy | |
476b8477 GKH |
1516 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
1517 | || !(comedi_get_subdevice_runflags(read_subdev) & | |
1518 | SRF_RUNNING)) { | |
ed9eccbe DS |
1519 | mask |= POLLIN | POLLRDNORM; |
1520 | } | |
1521 | } | |
1522 | write_subdev = comedi_get_write_subdevice(dev_file_info); | |
1523 | if (write_subdev) { | |
1524 | poll_wait(file, &write_subdev->async->wait_head, wait); | |
476b8477 GKH |
1525 | comedi_buf_write_alloc(write_subdev->async, |
1526 | write_subdev->async->prealloc_bufsz); | |
ed9eccbe | 1527 | if (!write_subdev->busy |
476b8477 GKH |
1528 | || !(comedi_get_subdevice_runflags(write_subdev) & |
1529 | SRF_RUNNING) | |
1530 | || comedi_buf_write_n_allocated(write_subdev->async) >= | |
1531 | bytes_per_sample(write_subdev->async->subdevice)) { | |
ed9eccbe DS |
1532 | mask |= POLLOUT | POLLWRNORM; |
1533 | } | |
1534 | } | |
1535 | ||
1536 | mutex_unlock(&dev->mutex); | |
1537 | return mask; | |
1538 | } | |
1539 | ||
92d0127c GKH |
1540 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
1541 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 1542 | { |
34c43922 | 1543 | struct comedi_subdevice *s; |
d163679c | 1544 | struct comedi_async *async; |
ed9eccbe DS |
1545 | int n, m, count = 0, retval = 0; |
1546 | DECLARE_WAITQUEUE(wait, current); | |
1547 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1548 | struct comedi_device_file_info *dev_file_info = |
1549 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1550 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1551 | |
1552 | if (!dev->attached) { | |
1553 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1554 | retval = -ENODEV; | |
1555 | goto done; | |
1556 | } | |
1557 | ||
1558 | s = comedi_get_write_subdevice(dev_file_info); | |
1559 | if (s == NULL) { | |
1560 | retval = -EIO; | |
1561 | goto done; | |
1562 | } | |
1563 | async = s->async; | |
1564 | ||
1565 | if (!nbytes) { | |
1566 | retval = 0; | |
1567 | goto done; | |
1568 | } | |
1569 | if (!s->busy) { | |
1570 | retval = 0; | |
1571 | goto done; | |
1572 | } | |
1573 | if (s->busy != file) { | |
1574 | retval = -EACCES; | |
1575 | goto done; | |
1576 | } | |
1577 | add_wait_queue(&async->wait_head, &wait); | |
1578 | while (nbytes > 0 && !retval) { | |
1579 | set_current_state(TASK_INTERRUPTIBLE); | |
1580 | ||
d2611540 IA |
1581 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
1582 | if (count == 0) { | |
1583 | if (comedi_get_subdevice_runflags(s) & | |
1584 | SRF_ERROR) { | |
1585 | retval = -EPIPE; | |
1586 | } else { | |
1587 | retval = 0; | |
1588 | } | |
1589 | do_become_nonbusy(dev, s); | |
1590 | } | |
1591 | break; | |
1592 | } | |
1593 | ||
ed9eccbe DS |
1594 | n = nbytes; |
1595 | ||
1596 | m = n; | |
476b8477 | 1597 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1598 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1599 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1600 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1601 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1602 | if (m < n) |
1603 | n = m; | |
1604 | ||
1605 | if (n == 0) { | |
ed9eccbe DS |
1606 | if (file->f_flags & O_NONBLOCK) { |
1607 | retval = -EAGAIN; | |
1608 | break; | |
1609 | } | |
1610 | if (signal_pending(current)) { | |
1611 | retval = -ERESTARTSYS; | |
1612 | break; | |
1613 | } | |
1614 | schedule(); | |
476b8477 | 1615 | if (!s->busy) |
ed9eccbe | 1616 | break; |
ed9eccbe DS |
1617 | if (s->busy != file) { |
1618 | retval = -EACCES; | |
1619 | break; | |
1620 | } | |
1621 | continue; | |
1622 | } | |
1623 | ||
1624 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1625 | buf, n); |
ed9eccbe DS |
1626 | if (m) { |
1627 | n -= m; | |
1628 | retval = -EFAULT; | |
1629 | } | |
1630 | comedi_buf_write_free(async, n); | |
1631 | ||
1632 | count += n; | |
1633 | nbytes -= n; | |
1634 | ||
1635 | buf += n; | |
1636 | break; /* makes device work like a pipe */ | |
1637 | } | |
1638 | set_current_state(TASK_RUNNING); | |
1639 | remove_wait_queue(&async->wait_head, &wait); | |
1640 | ||
1641 | done: | |
476b8477 | 1642 | return count ? count : retval; |
ed9eccbe DS |
1643 | } |
1644 | ||
92d0127c | 1645 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 1646 | loff_t *offset) |
ed9eccbe | 1647 | { |
34c43922 | 1648 | struct comedi_subdevice *s; |
d163679c | 1649 | struct comedi_async *async; |
ed9eccbe DS |
1650 | int n, m, count = 0, retval = 0; |
1651 | DECLARE_WAITQUEUE(wait, current); | |
1652 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1653 | struct comedi_device_file_info *dev_file_info = |
1654 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1655 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1656 | |
1657 | if (!dev->attached) { | |
1658 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1659 | retval = -ENODEV; | |
1660 | goto done; | |
1661 | } | |
1662 | ||
1663 | s = comedi_get_read_subdevice(dev_file_info); | |
1664 | if (s == NULL) { | |
1665 | retval = -EIO; | |
1666 | goto done; | |
1667 | } | |
1668 | async = s->async; | |
1669 | if (!nbytes) { | |
1670 | retval = 0; | |
1671 | goto done; | |
1672 | } | |
1673 | if (!s->busy) { | |
1674 | retval = 0; | |
1675 | goto done; | |
1676 | } | |
1677 | if (s->busy != file) { | |
1678 | retval = -EACCES; | |
1679 | goto done; | |
1680 | } | |
1681 | ||
1682 | add_wait_queue(&async->wait_head, &wait); | |
1683 | while (nbytes > 0 && !retval) { | |
1684 | set_current_state(TASK_INTERRUPTIBLE); | |
1685 | ||
1686 | n = nbytes; | |
1687 | ||
1688 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
1689 | /* printk("%d available\n",m); */ |
1690 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 1691 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 1692 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
1693 | if (m < n) |
1694 | n = m; | |
1695 | ||
1696 | if (n == 0) { | |
1697 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1698 | do_become_nonbusy(dev, s); | |
1699 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1700 | SRF_ERROR) { |
ed9eccbe DS |
1701 | retval = -EPIPE; |
1702 | } else { | |
1703 | retval = 0; | |
1704 | } | |
1705 | break; | |
1706 | } | |
1707 | if (file->f_flags & O_NONBLOCK) { | |
1708 | retval = -EAGAIN; | |
1709 | break; | |
1710 | } | |
1711 | if (signal_pending(current)) { | |
1712 | retval = -ERESTARTSYS; | |
1713 | break; | |
1714 | } | |
1715 | schedule(); | |
1716 | if (!s->busy) { | |
1717 | retval = 0; | |
1718 | break; | |
1719 | } | |
1720 | if (s->busy != file) { | |
1721 | retval = -EACCES; | |
1722 | break; | |
1723 | } | |
1724 | continue; | |
1725 | } | |
1726 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 1727 | async->buf_read_ptr, n); |
ed9eccbe DS |
1728 | if (m) { |
1729 | n -= m; | |
1730 | retval = -EFAULT; | |
1731 | } | |
1732 | ||
1733 | comedi_buf_read_alloc(async, n); | |
1734 | comedi_buf_read_free(async, n); | |
1735 | ||
1736 | count += n; | |
1737 | nbytes -= n; | |
1738 | ||
1739 | buf += n; | |
1740 | break; /* makes device work like a pipe */ | |
1741 | } | |
1742 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && | |
476b8477 | 1743 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
1744 | do_become_nonbusy(dev, s); |
1745 | } | |
1746 | set_current_state(TASK_RUNNING); | |
1747 | remove_wait_queue(&async->wait_head, &wait); | |
1748 | ||
1749 | done: | |
476b8477 | 1750 | return count ? count : retval; |
ed9eccbe DS |
1751 | } |
1752 | ||
1753 | /* | |
1754 | This function restores a subdevice to an idle state. | |
1755 | */ | |
34c43922 | 1756 | void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 1757 | { |
d163679c | 1758 | struct comedi_async *async = s->async; |
ed9eccbe DS |
1759 | |
1760 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
ed9eccbe DS |
1761 | if (async) { |
1762 | comedi_reset_async_buf(async); | |
1763 | async->inttrig = NULL; | |
1764 | } else { | |
476b8477 GKH |
1765 | printk(KERN_ERR |
1766 | "BUG: (?) do_become_nonbusy called with async=0\n"); | |
ed9eccbe DS |
1767 | } |
1768 | ||
1769 | s->busy = NULL; | |
1770 | } | |
1771 | ||
1772 | static int comedi_open(struct inode *inode, struct file *file) | |
1773 | { | |
ed9eccbe | 1774 | const unsigned minor = iminor(inode); |
476b8477 GKH |
1775 | struct comedi_device_file_info *dev_file_info = |
1776 | comedi_get_device_file_info(minor); | |
0a85b6f0 MT |
1777 | struct comedi_device *dev = |
1778 | dev_file_info ? dev_file_info->device : NULL; | |
97920071 | 1779 | |
ed9eccbe DS |
1780 | if (dev == NULL) { |
1781 | DPRINTK("invalid minor number\n"); | |
1782 | return -ENODEV; | |
1783 | } | |
1784 | ||
1785 | /* This is slightly hacky, but we want module autoloading | |
1786 | * to work for root. | |
1787 | * case: user opens device, attached -> ok | |
1788 | * case: user opens device, unattached, in_request_module=0 -> autoload | |
1789 | * case: user opens device, unattached, in_request_module=1 -> fail | |
1790 | * case: root opens device, attached -> ok | |
1791 | * case: root opens device, unattached, in_request_module=1 -> ok | |
1792 | * (typically called from modprobe) | |
1793 | * case: root opens device, unattached, in_request_module=0 -> autoload | |
1794 | * | |
1795 | * The last could be changed to "-> ok", which would deny root | |
1796 | * autoloading. | |
1797 | */ | |
1798 | mutex_lock(&dev->mutex); | |
1799 | if (dev->attached) | |
1800 | goto ok; | |
a8f80e8f | 1801 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
1802 | DPRINTK("in request module\n"); |
1803 | mutex_unlock(&dev->mutex); | |
1804 | return -ENODEV; | |
1805 | } | |
a8f80e8f | 1806 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
1807 | goto ok; |
1808 | ||
1809 | dev->in_request_module = 1; | |
1810 | ||
ed9eccbe DS |
1811 | #ifdef CONFIG_KMOD |
1812 | mutex_unlock(&dev->mutex); | |
56d92c60 | 1813 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
1814 | mutex_lock(&dev->mutex); |
1815 | #endif | |
1816 | ||
1817 | dev->in_request_module = 0; | |
1818 | ||
a8f80e8f EP |
1819 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
1820 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
1821 | mutex_unlock(&dev->mutex); |
1822 | return -ENODEV; | |
1823 | } | |
1824 | ok: | |
1825 | __module_get(THIS_MODULE); | |
1826 | ||
1827 | if (dev->attached) { | |
1828 | if (!try_module_get(dev->driver->module)) { | |
1829 | module_put(THIS_MODULE); | |
1830 | mutex_unlock(&dev->mutex); | |
1831 | return -ENOSYS; | |
1832 | } | |
1833 | } | |
1834 | ||
476b8477 | 1835 | if (dev->attached && dev->use_count == 0 && dev->open) |
ed9eccbe | 1836 | dev->open(dev); |
ed9eccbe DS |
1837 | |
1838 | dev->use_count++; | |
1839 | ||
1840 | mutex_unlock(&dev->mutex); | |
1841 | ||
1842 | return 0; | |
1843 | } | |
1844 | ||
1845 | static int comedi_close(struct inode *inode, struct file *file) | |
1846 | { | |
1847 | const unsigned minor = iminor(inode); | |
476b8477 GKH |
1848 | struct comedi_device_file_info *dev_file_info = |
1849 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1850 | struct comedi_device *dev = dev_file_info->device; |
34c43922 | 1851 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
1852 | int i; |
1853 | ||
1854 | mutex_lock(&dev->mutex); | |
1855 | ||
1856 | if (dev->subdevices) { | |
1857 | for (i = 0; i < dev->n_subdevices; i++) { | |
1858 | s = dev->subdevices + i; | |
1859 | ||
476b8477 | 1860 | if (s->busy == file) |
ed9eccbe | 1861 | do_cancel(dev, s); |
476b8477 | 1862 | if (s->lock == file) |
ed9eccbe | 1863 | s->lock = NULL; |
ed9eccbe DS |
1864 | } |
1865 | } | |
476b8477 | 1866 | if (dev->attached && dev->use_count == 1 && dev->close) |
ed9eccbe | 1867 | dev->close(dev); |
ed9eccbe DS |
1868 | |
1869 | module_put(THIS_MODULE); | |
476b8477 | 1870 | if (dev->attached) |
ed9eccbe | 1871 | module_put(dev->driver->module); |
ed9eccbe DS |
1872 | |
1873 | dev->use_count--; | |
1874 | ||
1875 | mutex_unlock(&dev->mutex); | |
1876 | ||
476b8477 | 1877 | if (file->f_flags & FASYNC) |
ed9eccbe | 1878 | comedi_fasync(-1, file, 0); |
ed9eccbe DS |
1879 | |
1880 | return 0; | |
1881 | } | |
1882 | ||
1883 | static int comedi_fasync(int fd, struct file *file, int on) | |
1884 | { | |
1885 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1886 | struct comedi_device_file_info *dev_file_info = |
1887 | comedi_get_device_file_info(minor); | |
1888 | ||
71b5f4f1 | 1889 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1890 | |
1891 | return fasync_helper(fd, file, on, &dev->async_queue); | |
1892 | } | |
1893 | ||
1894 | const struct file_operations comedi_fops = { | |
0a85b6f0 | 1895 | .owner = THIS_MODULE, |
0a85b6f0 | 1896 | .unlocked_ioctl = comedi_unlocked_ioctl, |
0a85b6f0 | 1897 | .compat_ioctl = comedi_compat_ioctl, |
0a85b6f0 MT |
1898 | .open = comedi_open, |
1899 | .release = comedi_close, | |
1900 | .read = comedi_read, | |
1901 | .write = comedi_write, | |
1902 | .mmap = comedi_mmap, | |
1903 | .poll = comedi_poll, | |
1904 | .fasync = comedi_fasync, | |
ed9eccbe DS |
1905 | }; |
1906 | ||
476b8477 | 1907 | struct class *comedi_class; |
ed9eccbe DS |
1908 | static struct cdev comedi_cdev; |
1909 | ||
1910 | static void comedi_cleanup_legacy_minors(void) | |
1911 | { | |
1912 | unsigned i; | |
476b8477 | 1913 | |
1dd33ab8 | 1914 | for (i = 0; i < comedi_num_legacy_minors; i++) |
ed9eccbe | 1915 | comedi_free_board_minor(i); |
ed9eccbe DS |
1916 | } |
1917 | ||
1918 | static int __init comedi_init(void) | |
1919 | { | |
1920 | int i; | |
1921 | int retval; | |
1922 | ||
476b8477 GKH |
1923 | printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
1924 | " - http://www.comedi.org\n"); | |
ed9eccbe | 1925 | |
a3cb729e FMH |
1926 | if (comedi_num_legacy_minors < 0 || |
1927 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
1928 | printk(KERN_ERR "comedi: error: invalid value for module " | |
1929 | "parameter \"comedi_num_legacy_minors\". Valid values " | |
1930 | "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); | |
1931 | return -EINVAL; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * comedi is unusable if both comedi_autoconfig and | |
1936 | * comedi_num_legacy_minors are zero, so we might as well adjust the | |
1937 | * defaults in that case | |
1938 | */ | |
1939 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) | |
1940 | comedi_num_legacy_minors = 16; | |
1941 | ||
476b8477 GKH |
1942 | memset(comedi_file_info_table, 0, |
1943 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); | |
ed9eccbe DS |
1944 | |
1945 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1946 | COMEDI_NUM_MINORS, "comedi"); |
ed9eccbe DS |
1947 | if (retval) |
1948 | return -EIO; | |
1949 | cdev_init(&comedi_cdev, &comedi_fops); | |
1950 | comedi_cdev.owner = THIS_MODULE; | |
1951 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
1952 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
1953 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1954 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1955 | return -EIO; |
1956 | } | |
1957 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
1958 | if (IS_ERR(comedi_class)) { | |
3fffdf20 | 1959 | printk(KERN_ERR "comedi: failed to create class"); |
ed9eccbe DS |
1960 | cdev_del(&comedi_cdev); |
1961 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1962 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1963 | return PTR_ERR(comedi_class); |
1964 | } | |
1965 | ||
1966 | /* XXX requires /proc interface */ | |
1967 | comedi_proc_init(); | |
1968 | ||
476b8477 | 1969 | /* create devices files for legacy/manual use */ |
1dd33ab8 | 1970 | for (i = 0; i < comedi_num_legacy_minors; i++) { |
ed9eccbe DS |
1971 | int minor; |
1972 | minor = comedi_alloc_board_minor(NULL); | |
476b8477 | 1973 | if (minor < 0) { |
ed9eccbe DS |
1974 | comedi_cleanup_legacy_minors(); |
1975 | cdev_del(&comedi_cdev); | |
1976 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1977 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1978 | return minor; |
1979 | } | |
1980 | } | |
1981 | ||
ed9eccbe DS |
1982 | return 0; |
1983 | } | |
1984 | ||
1985 | static void __exit comedi_cleanup(void) | |
1986 | { | |
1987 | int i; | |
1988 | ||
1989 | comedi_cleanup_legacy_minors(); | |
476b8477 | 1990 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
ed9eccbe | 1991 | BUG_ON(comedi_file_info_table[i]); |
476b8477 | 1992 | |
ed9eccbe DS |
1993 | class_destroy(comedi_class); |
1994 | cdev_del(&comedi_cdev); | |
1995 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
1996 | ||
1997 | comedi_proc_cleanup(); | |
ed9eccbe DS |
1998 | } |
1999 | ||
2000 | module_init(comedi_init); | |
2001 | module_exit(comedi_cleanup); | |
2002 | ||
71b5f4f1 | 2003 | void comedi_error(const struct comedi_device *dev, const char *s) |
ed9eccbe | 2004 | { |
3fffdf20 MR |
2005 | printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, |
2006 | dev->driver->driver_name, s); | |
ed9eccbe | 2007 | } |
18736438 | 2008 | EXPORT_SYMBOL(comedi_error); |
ed9eccbe | 2009 | |
34c43922 | 2010 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 2011 | { |
d163679c | 2012 | struct comedi_async *async = s->async; |
ed9eccbe DS |
2013 | unsigned runflags = 0; |
2014 | unsigned runflags_mask = 0; | |
2015 | ||
476b8477 | 2016 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
ed9eccbe DS |
2017 | |
2018 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) | |
2019 | return; | |
2020 | ||
0a85b6f0 MT |
2021 | if (s-> |
2022 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2023 | COMEDI_CB_OVERFLOW)) { | |
ed9eccbe DS |
2024 | runflags_mask |= SRF_RUNNING; |
2025 | } | |
2026 | /* remember if an error event has occured, so an error | |
2027 | * can be returned the next time the user does a read() */ | |
2028 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2029 | runflags_mask |= SRF_ERROR; | |
2030 | runflags |= SRF_ERROR; | |
2031 | } | |
2032 | if (runflags_mask) { | |
2033 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2034 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
2035 | } | |
2036 | ||
2037 | if (async->cb_mask & s->async->events) { | |
2038 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
fcea1154 | 2039 | wake_up_interruptible(&async->wait_head); |
6705b68d | 2040 | if (s->subdev_flags & SDF_CMD_READ) |
0a85b6f0 | 2041 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
6705b68d | 2042 | if (s->subdev_flags & SDF_CMD_WRITE) |
0a85b6f0 | 2043 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); |
ed9eccbe DS |
2044 | } else { |
2045 | if (async->cb_func) | |
2046 | async->cb_func(s->async->events, async->cb_arg); | |
ed9eccbe DS |
2047 | } |
2048 | } | |
2049 | s->async->events = 0; | |
2050 | } | |
18736438 | 2051 | EXPORT_SYMBOL(comedi_event); |
ed9eccbe | 2052 | |
34c43922 | 2053 | unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
ed9eccbe DS |
2054 | { |
2055 | unsigned long flags; | |
2056 | unsigned runflags; | |
2057 | ||
5f74ea14 | 2058 | spin_lock_irqsave(&s->spin_lock, flags); |
ed9eccbe | 2059 | runflags = s->runflags; |
5f74ea14 | 2060 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
2061 | return runflags; |
2062 | } | |
18736438 | 2063 | EXPORT_SYMBOL(comedi_get_subdevice_runflags); |
ed9eccbe | 2064 | |
71b5f4f1 | 2065 | static int is_device_busy(struct comedi_device *dev) |
ed9eccbe | 2066 | { |
34c43922 | 2067 | struct comedi_subdevice *s; |
ed9eccbe DS |
2068 | int i; |
2069 | ||
2070 | if (!dev->attached) | |
2071 | return 0; | |
2072 | ||
2073 | for (i = 0; i < dev->n_subdevices; i++) { | |
2074 | s = dev->subdevices + i; | |
2075 | if (s->busy) | |
2076 | return 1; | |
2077 | if (s->async && s->async->mmap_count) | |
2078 | return 1; | |
2079 | } | |
2080 | ||
2081 | return 0; | |
2082 | } | |
2083 | ||
92d0127c | 2084 | static void comedi_device_init(struct comedi_device *dev) |
ed9eccbe | 2085 | { |
71b5f4f1 | 2086 | memset(dev, 0, sizeof(struct comedi_device)); |
ed9eccbe DS |
2087 | spin_lock_init(&dev->spinlock); |
2088 | mutex_init(&dev->mutex); | |
2089 | dev->minor = -1; | |
2090 | } | |
2091 | ||
92d0127c | 2092 | static void comedi_device_cleanup(struct comedi_device *dev) |
ed9eccbe | 2093 | { |
476b8477 GKH |
2094 | if (dev == NULL) |
2095 | return; | |
ed9eccbe DS |
2096 | mutex_lock(&dev->mutex); |
2097 | comedi_device_detach(dev); | |
2098 | mutex_unlock(&dev->mutex); | |
2099 | mutex_destroy(&dev->mutex); | |
2100 | } | |
2101 | ||
2102 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2103 | { | |
2104 | unsigned long flags; | |
2105 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2106 | struct device *csdev; |
ed9eccbe | 2107 | unsigned i; |
883db3d9 | 2108 | int retval; |
ed9eccbe DS |
2109 | |
2110 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2111 | if (info == NULL) |
2112 | return -ENOMEM; | |
71b5f4f1 | 2113 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
476b8477 | 2114 | if (info->device == NULL) { |
ed9eccbe DS |
2115 | kfree(info); |
2116 | return -ENOMEM; | |
2117 | } | |
2118 | comedi_device_init(info->device); | |
5f74ea14 | 2119 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
476b8477 GKH |
2120 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
2121 | if (comedi_file_info_table[i] == NULL) { | |
ed9eccbe DS |
2122 | comedi_file_info_table[i] = info; |
2123 | break; | |
2124 | } | |
2125 | } | |
5f74ea14 | 2126 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2127 | if (i == COMEDI_NUM_BOARD_MINORS) { |
ed9eccbe DS |
2128 | comedi_device_cleanup(info->device); |
2129 | kfree(info->device); | |
2130 | kfree(info); | |
0a85b6f0 | 2131 | printk(KERN_ERR |
21fe2eea M |
2132 | "comedi: error: " |
2133 | "ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2134 | return -EBUSY; |
2135 | } | |
2136 | info->device->minor = i; | |
2137 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, | |
476b8477 GKH |
2138 | MKDEV(COMEDI_MAJOR, i), NULL, |
2139 | hardware_device, "comedi%i", i); | |
2140 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2141 | info->device->class_dev = csdev; |
883db3d9 FMH |
2142 | dev_set_drvdata(csdev, info); |
2143 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2144 | if (retval) { | |
0a85b6f0 | 2145 | printk(KERN_ERR |
21fe2eea M |
2146 | "comedi: " |
2147 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2148 | dev_attr_max_read_buffer_kb.attr.name); |
883db3d9 FMH |
2149 | comedi_free_board_minor(i); |
2150 | return retval; | |
2151 | } | |
2152 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2153 | if (retval) { | |
0a85b6f0 | 2154 | printk(KERN_ERR |
21fe2eea M |
2155 | "comedi: " |
2156 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2157 | dev_attr_read_buffer_kb.attr.name); |
883db3d9 FMH |
2158 | comedi_free_board_minor(i); |
2159 | return retval; | |
2160 | } | |
2161 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2162 | if (retval) { | |
0a85b6f0 | 2163 | printk(KERN_ERR |
21fe2eea M |
2164 | "comedi: " |
2165 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2166 | dev_attr_max_write_buffer_kb.attr.name); |
883db3d9 FMH |
2167 | comedi_free_board_minor(i); |
2168 | return retval; | |
2169 | } | |
2170 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2171 | if (retval) { | |
0a85b6f0 | 2172 | printk(KERN_ERR |
21fe2eea M |
2173 | "comedi: " |
2174 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2175 | dev_attr_write_buffer_kb.attr.name); |
883db3d9 FMH |
2176 | comedi_free_board_minor(i); |
2177 | return retval; | |
2178 | } | |
ed9eccbe DS |
2179 | return i; |
2180 | } | |
2181 | ||
2182 | void comedi_free_board_minor(unsigned minor) | |
2183 | { | |
2184 | unsigned long flags; | |
2185 | struct comedi_device_file_info *info; | |
2186 | ||
2187 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
5f74ea14 | 2188 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2189 | info = comedi_file_info_table[minor]; |
2190 | comedi_file_info_table[minor] = NULL; | |
5f74ea14 | 2191 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2192 | |
476b8477 | 2193 | if (info) { |
71b5f4f1 | 2194 | struct comedi_device *dev = info->device; |
476b8477 GKH |
2195 | if (dev) { |
2196 | if (dev->class_dev) { | |
2197 | device_destroy(comedi_class, | |
2198 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
ed9eccbe DS |
2199 | } |
2200 | comedi_device_cleanup(dev); | |
2201 | kfree(dev); | |
2202 | } | |
2203 | kfree(info); | |
2204 | } | |
2205 | } | |
2206 | ||
883db3d9 FMH |
2207 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
2208 | struct comedi_subdevice *s) | |
ed9eccbe DS |
2209 | { |
2210 | unsigned long flags; | |
2211 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2212 | struct device *csdev; |
ed9eccbe | 2213 | unsigned i; |
883db3d9 | 2214 | int retval; |
ed9eccbe DS |
2215 | |
2216 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2217 | if (info == NULL) |
2218 | return -ENOMEM; | |
ed9eccbe DS |
2219 | info->device = dev; |
2220 | info->read_subdevice = s; | |
2221 | info->write_subdevice = s; | |
5f74ea14 | 2222 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
4c41f3ae | 2223 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { |
476b8477 | 2224 | if (comedi_file_info_table[i] == NULL) { |
ed9eccbe DS |
2225 | comedi_file_info_table[i] = info; |
2226 | break; | |
2227 | } | |
2228 | } | |
5f74ea14 | 2229 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2230 | if (i == COMEDI_NUM_MINORS) { |
ed9eccbe | 2231 | kfree(info); |
0a85b6f0 | 2232 | printk(KERN_ERR |
21fe2eea M |
2233 | "comedi: error: " |
2234 | "ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2235 | return -EBUSY; |
2236 | } | |
2237 | s->minor = i; | |
2238 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, | |
476b8477 GKH |
2239 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
2240 | "comedi%i_subd%i", dev->minor, | |
2241 | (int)(s - dev->subdevices)); | |
2242 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2243 | s->class_dev = csdev; |
883db3d9 FMH |
2244 | dev_set_drvdata(csdev, info); |
2245 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2246 | if (retval) { | |
0a85b6f0 | 2247 | printk(KERN_ERR |
21fe2eea M |
2248 | "comedi: " |
2249 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2250 | dev_attr_max_read_buffer_kb.attr.name); |
883db3d9 FMH |
2251 | comedi_free_subdevice_minor(s); |
2252 | return retval; | |
2253 | } | |
2254 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2255 | if (retval) { | |
0a85b6f0 | 2256 | printk(KERN_ERR |
21fe2eea M |
2257 | "comedi: " |
2258 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2259 | dev_attr_read_buffer_kb.attr.name); |
883db3d9 FMH |
2260 | comedi_free_subdevice_minor(s); |
2261 | return retval; | |
2262 | } | |
2263 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2264 | if (retval) { | |
0a85b6f0 | 2265 | printk(KERN_ERR |
21fe2eea M |
2266 | "comedi: " |
2267 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2268 | dev_attr_max_write_buffer_kb.attr.name); |
883db3d9 FMH |
2269 | comedi_free_subdevice_minor(s); |
2270 | return retval; | |
2271 | } | |
2272 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2273 | if (retval) { | |
0a85b6f0 | 2274 | printk(KERN_ERR |
21fe2eea M |
2275 | "comedi: " |
2276 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2277 | dev_attr_write_buffer_kb.attr.name); |
883db3d9 FMH |
2278 | comedi_free_subdevice_minor(s); |
2279 | return retval; | |
2280 | } | |
ed9eccbe DS |
2281 | return i; |
2282 | } | |
2283 | ||
34c43922 | 2284 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
ed9eccbe DS |
2285 | { |
2286 | unsigned long flags; | |
2287 | struct comedi_device_file_info *info; | |
2288 | ||
476b8477 GKH |
2289 | if (s == NULL) |
2290 | return; | |
2291 | if (s->minor < 0) | |
2292 | return; | |
ed9eccbe DS |
2293 | |
2294 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); | |
2295 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
2296 | ||
5f74ea14 | 2297 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2298 | info = comedi_file_info_table[s->minor]; |
2299 | comedi_file_info_table[s->minor] = NULL; | |
5f74ea14 | 2300 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2301 | |
476b8477 | 2302 | if (s->class_dev) { |
ed9eccbe DS |
2303 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
2304 | s->class_dev = NULL; | |
2305 | } | |
2306 | kfree(info); | |
2307 | } | |
2308 | ||
2309 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) | |
2310 | { | |
2311 | unsigned long flags; | |
2312 | struct comedi_device_file_info *info; | |
2313 | ||
2314 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
5f74ea14 | 2315 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2316 | info = comedi_file_info_table[minor]; |
5f74ea14 | 2317 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2318 | return info; |
2319 | } | |
18736438 | 2320 | EXPORT_SYMBOL_GPL(comedi_get_device_file_info); |
883db3d9 FMH |
2321 | |
2322 | static int resize_async_buffer(struct comedi_device *dev, | |
2323 | struct comedi_subdevice *s, | |
2324 | struct comedi_async *async, unsigned new_size) | |
2325 | { | |
2326 | int retval; | |
2327 | ||
2328 | if (new_size > async->max_bufsize) | |
2329 | return -EPERM; | |
2330 | ||
2331 | if (s->busy) { | |
2332 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
2333 | return -EBUSY; | |
2334 | } | |
2335 | if (async->mmap_count) { | |
2336 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
2337 | return -EBUSY; | |
2338 | } | |
2339 | ||
2340 | if (!async->prealloc_buf) | |
2341 | return -EINVAL; | |
2342 | ||
2343 | /* make sure buffer is an integral number of pages | |
0a85b6f0 | 2344 | * (we round up) */ |
883db3d9 FMH |
2345 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
2346 | ||
2347 | retval = comedi_buf_alloc(dev, s, new_size); | |
2348 | if (retval < 0) | |
2349 | return retval; | |
2350 | ||
2351 | if (s->buf_change) { | |
2352 | retval = s->buf_change(dev, s, new_size); | |
2353 | if (retval < 0) | |
2354 | return retval; | |
2355 | } | |
2356 | ||
2357 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
b8b5cd9f | 2358 | dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); |
883db3d9 FMH |
2359 | return 0; |
2360 | } | |
2361 | ||
2362 | /* sysfs attribute files */ | |
2363 | ||
2364 | static const unsigned bytes_per_kibi = 1024; | |
2365 | ||
2366 | static ssize_t show_max_read_buffer_kb(struct device *dev, | |
2367 | struct device_attribute *attr, char *buf) | |
2368 | { | |
2369 | ssize_t retval; | |
2370 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2371 | unsigned max_buffer_size_kb = 0; | |
2372 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2373 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2374 | |
2375 | mutex_lock(&info->device->mutex); | |
2376 | if (read_subdevice && | |
2377 | (read_subdevice->subdev_flags & SDF_CMD_READ) && | |
2378 | read_subdevice->async) { | |
2379 | max_buffer_size_kb = read_subdevice->async->max_bufsize / | |
0a85b6f0 | 2380 | bytes_per_kibi; |
883db3d9 | 2381 | } |
0a85b6f0 | 2382 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2383 | mutex_unlock(&info->device->mutex); |
2384 | ||
2385 | return retval; | |
2386 | } | |
2387 | ||
2388 | static ssize_t store_max_read_buffer_kb(struct device *dev, | |
2389 | struct device_attribute *attr, | |
2390 | const char *buf, size_t count) | |
2391 | { | |
2392 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2393 | unsigned long new_max_size_kb; | |
2394 | uint64_t new_max_size; | |
2395 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2396 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2397 | |
2398 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2399 | return -EINVAL; | |
0a85b6f0 | 2400 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2401 | return -EINVAL; |
0a85b6f0 MT |
2402 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2403 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2404 | return -EINVAL; |
2405 | ||
2406 | mutex_lock(&info->device->mutex); | |
2407 | if (read_subdevice == NULL || | |
2408 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2409 | read_subdevice->async == NULL) { | |
2410 | mutex_unlock(&info->device->mutex); | |
2411 | return -EINVAL; | |
2412 | } | |
2413 | read_subdevice->async->max_bufsize = new_max_size; | |
2414 | mutex_unlock(&info->device->mutex); | |
2415 | ||
2416 | return count; | |
2417 | } | |
2418 | ||
2419 | static struct device_attribute dev_attr_max_read_buffer_kb = { | |
2420 | .attr = { | |
0a85b6f0 MT |
2421 | .name = "max_read_buffer_kb", |
2422 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2423 | .show = &show_max_read_buffer_kb, |
2424 | .store = &store_max_read_buffer_kb | |
2425 | }; | |
2426 | ||
2427 | static ssize_t show_read_buffer_kb(struct device *dev, | |
2428 | struct device_attribute *attr, char *buf) | |
2429 | { | |
2430 | ssize_t retval; | |
2431 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2432 | unsigned buffer_size_kb = 0; | |
2433 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2434 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2435 | |
2436 | mutex_lock(&info->device->mutex); | |
2437 | if (read_subdevice && | |
0a85b6f0 MT |
2438 | (read_subdevice->subdev_flags & SDF_CMD_READ) && |
2439 | read_subdevice->async) { | |
883db3d9 | 2440 | buffer_size_kb = read_subdevice->async->prealloc_bufsz / |
0a85b6f0 | 2441 | bytes_per_kibi; |
883db3d9 | 2442 | } |
0a85b6f0 | 2443 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2444 | mutex_unlock(&info->device->mutex); |
2445 | ||
2446 | return retval; | |
2447 | } | |
2448 | ||
2449 | static ssize_t store_read_buffer_kb(struct device *dev, | |
2450 | struct device_attribute *attr, | |
2451 | const char *buf, size_t count) | |
2452 | { | |
2453 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2454 | unsigned long new_size_kb; | |
2455 | uint64_t new_size; | |
2456 | int retval; | |
2457 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2458 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2459 | |
2460 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2461 | return -EINVAL; | |
0a85b6f0 | 2462 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2463 | return -EINVAL; |
0a85b6f0 MT |
2464 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2465 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2466 | return -EINVAL; |
2467 | ||
2468 | mutex_lock(&info->device->mutex); | |
2469 | if (read_subdevice == NULL || | |
2470 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2471 | read_subdevice->async == NULL) { | |
2472 | mutex_unlock(&info->device->mutex); | |
2473 | return -EINVAL; | |
2474 | } | |
2475 | retval = resize_async_buffer(info->device, read_subdevice, | |
2476 | read_subdevice->async, new_size); | |
2477 | mutex_unlock(&info->device->mutex); | |
2478 | ||
2479 | if (retval < 0) | |
2480 | return retval; | |
2481 | return count; | |
2482 | } | |
2483 | ||
2484 | static struct device_attribute dev_attr_read_buffer_kb = { | |
2485 | .attr = { | |
0a85b6f0 MT |
2486 | .name = "read_buffer_kb", |
2487 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2488 | .show = &show_read_buffer_kb, |
2489 | .store = &store_read_buffer_kb | |
2490 | }; | |
2491 | ||
2492 | static ssize_t show_max_write_buffer_kb(struct device *dev, | |
2493 | struct device_attribute *attr, | |
2494 | char *buf) | |
2495 | { | |
2496 | ssize_t retval; | |
2497 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2498 | unsigned max_buffer_size_kb = 0; | |
2499 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2500 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2501 | |
2502 | mutex_lock(&info->device->mutex); | |
2503 | if (write_subdevice && | |
2504 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2505 | write_subdevice->async) { | |
2506 | max_buffer_size_kb = write_subdevice->async->max_bufsize / | |
0a85b6f0 | 2507 | bytes_per_kibi; |
883db3d9 | 2508 | } |
0a85b6f0 | 2509 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2510 | mutex_unlock(&info->device->mutex); |
2511 | ||
2512 | return retval; | |
2513 | } | |
2514 | ||
2515 | static ssize_t store_max_write_buffer_kb(struct device *dev, | |
2516 | struct device_attribute *attr, | |
2517 | const char *buf, size_t count) | |
2518 | { | |
2519 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2520 | unsigned long new_max_size_kb; | |
2521 | uint64_t new_max_size; | |
2522 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2523 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2524 | |
2525 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2526 | return -EINVAL; | |
0a85b6f0 | 2527 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2528 | return -EINVAL; |
0a85b6f0 MT |
2529 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2530 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2531 | return -EINVAL; |
2532 | ||
2533 | mutex_lock(&info->device->mutex); | |
2534 | if (write_subdevice == NULL || | |
2535 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2536 | write_subdevice->async == NULL) { | |
2537 | mutex_unlock(&info->device->mutex); | |
2538 | return -EINVAL; | |
2539 | } | |
2540 | write_subdevice->async->max_bufsize = new_max_size; | |
2541 | mutex_unlock(&info->device->mutex); | |
2542 | ||
2543 | return count; | |
2544 | } | |
2545 | ||
2546 | static struct device_attribute dev_attr_max_write_buffer_kb = { | |
2547 | .attr = { | |
0a85b6f0 MT |
2548 | .name = "max_write_buffer_kb", |
2549 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2550 | .show = &show_max_write_buffer_kb, |
2551 | .store = &store_max_write_buffer_kb | |
2552 | }; | |
2553 | ||
2554 | static ssize_t show_write_buffer_kb(struct device *dev, | |
2555 | struct device_attribute *attr, char *buf) | |
2556 | { | |
2557 | ssize_t retval; | |
2558 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2559 | unsigned buffer_size_kb = 0; | |
2560 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2561 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2562 | |
2563 | mutex_lock(&info->device->mutex); | |
2564 | if (write_subdevice && | |
2565 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2566 | write_subdevice->async) { | |
2567 | buffer_size_kb = write_subdevice->async->prealloc_bufsz / | |
0a85b6f0 | 2568 | bytes_per_kibi; |
883db3d9 | 2569 | } |
0a85b6f0 | 2570 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2571 | mutex_unlock(&info->device->mutex); |
2572 | ||
2573 | return retval; | |
2574 | } | |
2575 | ||
2576 | static ssize_t store_write_buffer_kb(struct device *dev, | |
2577 | struct device_attribute *attr, | |
2578 | const char *buf, size_t count) | |
2579 | { | |
2580 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2581 | unsigned long new_size_kb; | |
2582 | uint64_t new_size; | |
2583 | int retval; | |
2584 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2585 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2586 | |
2587 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2588 | return -EINVAL; | |
0a85b6f0 | 2589 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2590 | return -EINVAL; |
0a85b6f0 MT |
2591 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2592 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2593 | return -EINVAL; |
2594 | ||
2595 | mutex_lock(&info->device->mutex); | |
2596 | if (write_subdevice == NULL || | |
2597 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2598 | write_subdevice->async == NULL) { | |
2599 | mutex_unlock(&info->device->mutex); | |
2600 | return -EINVAL; | |
2601 | } | |
2602 | retval = resize_async_buffer(info->device, write_subdevice, | |
0a85b6f0 | 2603 | write_subdevice->async, new_size); |
883db3d9 FMH |
2604 | mutex_unlock(&info->device->mutex); |
2605 | ||
2606 | if (retval < 0) | |
2607 | return retval; | |
2608 | return count; | |
2609 | } | |
2610 | ||
2611 | static struct device_attribute dev_attr_write_buffer_kb = { | |
2612 | .attr = { | |
0a85b6f0 MT |
2613 | .name = "write_buffer_kb", |
2614 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2615 | .show = &show_write_buffer_kb, |
2616 | .store = &store_write_buffer_kb | |
2617 | }; |