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