Commit | Line | Data |
---|---|---|
ed9eccbe DS |
1 | /* |
2 | comedi/comedi_fops.c | |
3 | comedi kernel module | |
4 | ||
5 | COMEDI - Linux Control and Measurement Device Interface | |
6 | Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | */ | |
23 | ||
24 | #undef DEBUG | |
25 | ||
26 | #define __NO_VERSION__ | |
27 | #include "comedi_fops.h" | |
28 | #include "comedi_compat32.h" | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/kmod.h> | |
40 | #include <linux/poll.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/device.h> | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/fs.h> | |
45 | #include "comedidev.h" | |
46 | #include <linux/cdev.h> | |
883db3d9 | 47 | #include <linux/stat.h> |
ed9eccbe | 48 | |
476b8477 GKH |
49 | #include <linux/io.h> |
50 | #include <linux/uaccess.h> | |
ed9eccbe | 51 | |
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, | |
53fa827e | 86 | struct comedi_bufinfo __user *arg, void *file); |
92d0127c GKH |
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 | 171 | rc = do_bufinfo_ioctl(dev, |
53fa827e IA |
172 | (struct comedi_bufinfo __user *)arg, |
173 | file); | |
ed9eccbe DS |
174 | break; |
175 | case COMEDI_LOCK: | |
176 | rc = do_lock_ioctl(dev, arg, file); | |
177 | break; | |
178 | case COMEDI_UNLOCK: | |
179 | rc = do_unlock_ioctl(dev, arg, file); | |
180 | break; | |
181 | case COMEDI_CANCEL: | |
182 | rc = do_cancel_ioctl(dev, arg, file); | |
183 | break; | |
184 | case COMEDI_CMD: | |
92d0127c | 185 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); |
ed9eccbe DS |
186 | break; |
187 | case COMEDI_CMDTEST: | |
92d0127c GKH |
188 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, |
189 | file); | |
ed9eccbe DS |
190 | break; |
191 | case COMEDI_INSNLIST: | |
92d0127c GKH |
192 | rc = do_insnlist_ioctl(dev, |
193 | (struct comedi_insnlist __user *)arg, | |
194 | file); | |
ed9eccbe DS |
195 | break; |
196 | case COMEDI_INSN: | |
92d0127c GKH |
197 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, |
198 | file); | |
ed9eccbe DS |
199 | break; |
200 | case COMEDI_POLL: | |
201 | rc = do_poll_ioctl(dev, arg, file); | |
202 | break; | |
203 | default: | |
204 | rc = -ENOTTY; | |
205 | break; | |
206 | } | |
207 | ||
476b8477 | 208 | done: |
ed9eccbe DS |
209 | mutex_unlock(&dev->mutex); |
210 | return rc; | |
211 | } | |
212 | ||
213 | /* | |
214 | COMEDI_DEVCONFIG | |
215 | device config ioctl | |
216 | ||
217 | arg: | |
218 | pointer to devconfig structure | |
219 | ||
220 | reads: | |
221 | devconfig structure at arg | |
222 | ||
223 | writes: | |
224 | none | |
225 | */ | |
0a85b6f0 | 226 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 227 | struct comedi_devconfig __user *arg) |
ed9eccbe | 228 | { |
0707bb04 | 229 | struct comedi_devconfig it; |
ed9eccbe DS |
230 | int ret; |
231 | unsigned char *aux_data = NULL; | |
232 | int aux_len; | |
233 | ||
234 | if (!capable(CAP_SYS_ADMIN)) | |
235 | return -EPERM; | |
236 | ||
237 | if (arg == NULL) { | |
238 | if (is_device_busy(dev)) | |
239 | return -EBUSY; | |
476b8477 | 240 | if (dev->attached) { |
ed9eccbe DS |
241 | struct module *driver_module = dev->driver->module; |
242 | comedi_device_detach(dev); | |
243 | module_put(driver_module); | |
244 | } | |
245 | return 0; | |
246 | } | |
247 | ||
0707bb04 | 248 | if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) |
ed9eccbe DS |
249 | return -EFAULT; |
250 | ||
251 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
252 | ||
253 | if (comedi_aux_data(it.options, 0) && | |
476b8477 | 254 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
ed9eccbe DS |
255 | int bit_shift; |
256 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; | |
257 | if (aux_len < 0) | |
258 | return -EFAULT; | |
259 | ||
260 | aux_data = vmalloc(aux_len); | |
261 | if (!aux_data) | |
262 | return -ENOMEM; | |
263 | ||
264 | if (copy_from_user(aux_data, | |
476b8477 | 265 | comedi_aux_data(it.options, 0), aux_len)) { |
ed9eccbe DS |
266 | vfree(aux_data); |
267 | return -EFAULT; | |
268 | } | |
269 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = | |
476b8477 | 270 | (unsigned long)aux_data; |
ed9eccbe DS |
271 | if (sizeof(void *) > sizeof(int)) { |
272 | bit_shift = sizeof(int) * 8; | |
273 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = | |
476b8477 | 274 | ((unsigned long)aux_data) >> bit_shift; |
ed9eccbe DS |
275 | } else |
276 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; | |
277 | } | |
278 | ||
279 | ret = comedi_device_attach(dev, &it); | |
476b8477 GKH |
280 | if (ret == 0) { |
281 | if (!try_module_get(dev->driver->module)) { | |
ed9eccbe DS |
282 | comedi_device_detach(dev); |
283 | return -ENOSYS; | |
284 | } | |
285 | } | |
286 | ||
287 | if (aux_data) | |
288 | vfree(aux_data); | |
289 | ||
290 | return ret; | |
291 | } | |
292 | ||
293 | /* | |
294 | COMEDI_BUFCONFIG | |
295 | buffer configuration ioctl | |
296 | ||
297 | arg: | |
298 | pointer to bufconfig structure | |
299 | ||
300 | reads: | |
301 | bufconfig at arg | |
302 | ||
303 | writes: | |
304 | modified bufconfig at arg | |
305 | ||
306 | */ | |
92d0127c GKH |
307 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
308 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 309 | { |
be6aba4a | 310 | struct comedi_bufconfig bc; |
d163679c | 311 | struct comedi_async *async; |
34c43922 | 312 | struct comedi_subdevice *s; |
883db3d9 | 313 | int retval = 0; |
ed9eccbe | 314 | |
be6aba4a | 315 | if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
316 | return -EFAULT; |
317 | ||
318 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
319 | return -EINVAL; | |
320 | ||
321 | s = dev->subdevices + bc.subdevice; | |
322 | async = s->async; | |
323 | ||
324 | if (!async) { | |
325 | DPRINTK("subdevice does not have async capability\n"); | |
326 | bc.size = 0; | |
327 | bc.maximum_size = 0; | |
328 | goto copyback; | |
329 | } | |
330 | ||
331 | if (bc.maximum_size) { | |
332 | if (!capable(CAP_SYS_ADMIN)) | |
333 | return -EPERM; | |
334 | ||
335 | async->max_bufsize = bc.maximum_size; | |
336 | } | |
337 | ||
338 | if (bc.size) { | |
883db3d9 FMH |
339 | retval = resize_async_buffer(dev, s, async, bc.size); |
340 | if (retval < 0) | |
341 | return retval; | |
ed9eccbe DS |
342 | } |
343 | ||
344 | bc.size = async->prealloc_bufsz; | |
345 | bc.maximum_size = async->max_bufsize; | |
346 | ||
476b8477 | 347 | copyback: |
be6aba4a | 348 | if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) |
ed9eccbe DS |
349 | return -EFAULT; |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | /* | |
355 | COMEDI_DEVINFO | |
356 | device info ioctl | |
357 | ||
358 | arg: | |
359 | pointer to devinfo structure | |
360 | ||
361 | reads: | |
362 | none | |
363 | ||
364 | writes: | |
365 | devinfo structure | |
366 | ||
367 | */ | |
0a85b6f0 | 368 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
369 | struct comedi_devinfo __user *arg, |
370 | struct file *file) | |
ed9eccbe | 371 | { |
063db04b | 372 | struct comedi_devinfo devinfo; |
ed9eccbe | 373 | const unsigned minor = iminor(file->f_dentry->d_inode); |
476b8477 GKH |
374 | struct comedi_device_file_info *dev_file_info = |
375 | comedi_get_device_file_info(minor); | |
34c43922 | 376 | struct comedi_subdevice *read_subdev = |
476b8477 | 377 | comedi_get_read_subdevice(dev_file_info); |
34c43922 | 378 | struct comedi_subdevice *write_subdev = |
476b8477 | 379 | comedi_get_write_subdevice(dev_file_info); |
ed9eccbe DS |
380 | |
381 | memset(&devinfo, 0, sizeof(devinfo)); | |
382 | ||
383 | /* fill devinfo structure */ | |
384 | devinfo.version_code = COMEDI_VERSION_CODE; | |
385 | devinfo.n_subdevs = dev->n_subdevices; | |
386 | memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); | |
387 | memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
388 | ||
476b8477 | 389 | if (read_subdev) |
ed9eccbe | 390 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
476b8477 | 391 | else |
ed9eccbe | 392 | devinfo.read_subdevice = -1; |
476b8477 GKH |
393 | |
394 | if (write_subdev) | |
ed9eccbe | 395 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
476b8477 | 396 | else |
ed9eccbe | 397 | devinfo.write_subdevice = -1; |
ed9eccbe | 398 | |
063db04b | 399 | if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) |
ed9eccbe DS |
400 | return -EFAULT; |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | /* | |
406 | COMEDI_SUBDINFO | |
407 | subdevice info ioctl | |
408 | ||
409 | arg: | |
410 | pointer to array of subdevice info structures | |
411 | ||
412 | reads: | |
413 | none | |
414 | ||
415 | writes: | |
416 | array of subdevice info structures at arg | |
417 | ||
418 | */ | |
0a85b6f0 | 419 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 420 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
421 | { |
422 | int ret, i; | |
bd52efbb | 423 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 424 | struct comedi_subdevice *s; |
ed9eccbe | 425 | |
0a85b6f0 MT |
426 | tmp = |
427 | kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), | |
428 | GFP_KERNEL); | |
ed9eccbe DS |
429 | if (!tmp) |
430 | return -ENOMEM; | |
431 | ||
432 | /* fill subdinfo structs */ | |
433 | for (i = 0; i < dev->n_subdevices; i++) { | |
434 | s = dev->subdevices + i; | |
435 | us = tmp + i; | |
436 | ||
437 | us->type = s->type; | |
438 | us->n_chan = s->n_chan; | |
439 | us->subd_flags = s->subdev_flags; | |
440 | if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) | |
441 | us->subd_flags |= SDF_RUNNING; | |
442 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
443 | us->timer_type = TIMER_nanosec; | |
444 | us->len_chanlist = s->len_chanlist; | |
445 | us->maxdata = s->maxdata; | |
446 | if (s->range_table) { | |
447 | us->range_type = | |
476b8477 | 448 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
449 | } else { |
450 | us->range_type = 0; /* XXX */ | |
451 | } | |
452 | us->flags = s->flags; | |
453 | ||
454 | if (s->busy) | |
455 | us->subd_flags |= SDF_BUSY; | |
456 | if (s->busy == file) | |
457 | us->subd_flags |= SDF_BUSY_OWNER; | |
458 | if (s->lock) | |
459 | us->subd_flags |= SDF_LOCKED; | |
460 | if (s->lock == file) | |
461 | us->subd_flags |= SDF_LOCK_OWNER; | |
462 | if (!s->maxdata && s->maxdata_list) | |
463 | us->subd_flags |= SDF_MAXDATA; | |
464 | if (s->flaglist) | |
465 | us->subd_flags |= SDF_FLAGS; | |
466 | if (s->range_table_list) | |
467 | us->subd_flags |= SDF_RANGETYPE; | |
468 | if (s->do_cmd) | |
469 | us->subd_flags |= SDF_CMD; | |
470 | ||
471 | if (s->insn_bits != &insn_inval) | |
472 | us->insn_bits_support = COMEDI_SUPPORTED; | |
473 | else | |
474 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
475 | ||
476 | us->settling_time_0 = s->settling_time_0; | |
477 | } | |
478 | ||
479 | ret = copy_to_user(arg, tmp, | |
bd52efbb | 480 | dev->n_subdevices * sizeof(struct comedi_subdinfo)); |
ed9eccbe DS |
481 | |
482 | kfree(tmp); | |
483 | ||
484 | return ret ? -EFAULT : 0; | |
485 | } | |
486 | ||
487 | /* | |
488 | COMEDI_CHANINFO | |
489 | subdevice info ioctl | |
490 | ||
491 | arg: | |
492 | pointer to chaninfo structure | |
493 | ||
494 | reads: | |
495 | chaninfo structure at arg | |
496 | ||
497 | writes: | |
498 | arrays at elements of chaninfo structure | |
499 | ||
500 | */ | |
0a85b6f0 | 501 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 502 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 503 | { |
34c43922 | 504 | struct comedi_subdevice *s; |
a18b416d | 505 | struct comedi_chaninfo it; |
ed9eccbe | 506 | |
a18b416d | 507 | if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) |
ed9eccbe DS |
508 | return -EFAULT; |
509 | ||
510 | if (it.subdev >= dev->n_subdevices) | |
511 | return -EINVAL; | |
512 | s = dev->subdevices + it.subdev; | |
513 | ||
514 | if (it.maxdata_list) { | |
515 | if (s->maxdata || !s->maxdata_list) | |
516 | return -EINVAL; | |
517 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 518 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
519 | return -EFAULT; |
520 | } | |
521 | ||
522 | if (it.flaglist) { | |
523 | if (!s->flaglist) | |
524 | return -EINVAL; | |
525 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 526 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
527 | return -EFAULT; |
528 | } | |
529 | ||
530 | if (it.rangelist) { | |
531 | int i; | |
532 | ||
533 | if (!s->range_table_list) | |
534 | return -EINVAL; | |
535 | for (i = 0; i < s->n_chan; i++) { | |
536 | int x; | |
537 | ||
538 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 539 | (s->range_table_list[i]->length); |
81604d43 VK |
540 | if (put_user(x, it.rangelist + i)) |
541 | return -EFAULT; | |
ed9eccbe | 542 | } |
476b8477 GKH |
543 | #if 0 |
544 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 545 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
546 | return -EFAULT; |
547 | #endif | |
ed9eccbe DS |
548 | } |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | /* | |
554 | COMEDI_BUFINFO | |
555 | buffer information ioctl | |
556 | ||
557 | arg: | |
558 | pointer to bufinfo structure | |
559 | ||
560 | reads: | |
561 | bufinfo at arg | |
562 | ||
563 | writes: | |
564 | modified bufinfo at arg | |
565 | ||
566 | */ | |
92d0127c | 567 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 568 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 569 | { |
9aa5339a | 570 | struct comedi_bufinfo bi; |
34c43922 | 571 | struct comedi_subdevice *s; |
d163679c | 572 | struct comedi_async *async; |
ed9eccbe | 573 | |
9aa5339a | 574 | if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
575 | return -EFAULT; |
576 | ||
577 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
578 | return -EINVAL; | |
579 | ||
580 | s = dev->subdevices + bi.subdevice; | |
53fa827e IA |
581 | |
582 | if (s->lock && s->lock != file) | |
583 | return -EACCES; | |
584 | ||
ed9eccbe DS |
585 | async = s->async; |
586 | ||
587 | if (!async) { | |
588 | DPRINTK("subdevice does not have async capability\n"); | |
589 | bi.buf_write_ptr = 0; | |
590 | bi.buf_read_ptr = 0; | |
591 | bi.buf_write_count = 0; | |
592 | bi.buf_read_count = 0; | |
4772c018 IA |
593 | bi.bytes_read = 0; |
594 | bi.bytes_written = 0; | |
ed9eccbe DS |
595 | goto copyback; |
596 | } | |
53fa827e IA |
597 | if (!s->busy) { |
598 | bi.bytes_read = 0; | |
599 | bi.bytes_written = 0; | |
600 | goto copyback_position; | |
601 | } | |
602 | if (s->busy != file) | |
603 | return -EACCES; | |
ed9eccbe DS |
604 | |
605 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
606 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
607 | comedi_buf_read_free(async, bi.bytes_read); | |
608 | ||
609 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | | |
476b8477 GKH |
610 | SRF_RUNNING)) |
611 | && async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
612 | do_become_nonbusy(dev, s); |
613 | } | |
614 | } | |
615 | ||
616 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
617 | bi.bytes_written = | |
476b8477 | 618 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
619 | comedi_buf_write_free(async, bi.bytes_written); |
620 | } | |
621 | ||
53fa827e | 622 | copyback_position: |
ed9eccbe DS |
623 | bi.buf_write_count = async->buf_write_count; |
624 | bi.buf_write_ptr = async->buf_write_ptr; | |
625 | bi.buf_read_count = async->buf_read_count; | |
626 | bi.buf_read_ptr = async->buf_read_ptr; | |
627 | ||
476b8477 | 628 | copyback: |
9aa5339a | 629 | if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
630 | return -EFAULT; |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
0a85b6f0 MT |
635 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
636 | unsigned int *data, void *file); | |
ed9eccbe | 637 | /* |
20617f22 PDP |
638 | * COMEDI_INSNLIST |
639 | * synchronous instructions | |
ed9eccbe | 640 | * |
20617f22 PDP |
641 | * arg: |
642 | * pointer to sync cmd structure | |
ed9eccbe | 643 | * |
20617f22 PDP |
644 | * reads: |
645 | * sync cmd struct at arg | |
646 | * instruction list | |
647 | * data (for writes) | |
ed9eccbe | 648 | * |
20617f22 PDP |
649 | * writes: |
650 | * data (for reads) | |
ed9eccbe DS |
651 | */ |
652 | /* arbitrary limits */ | |
653 | #define MAX_SAMPLES 256 | |
92d0127c GKH |
654 | static int do_insnlist_ioctl(struct comedi_device *dev, |
655 | struct comedi_insnlist __user *arg, void *file) | |
ed9eccbe | 656 | { |
da613f4f | 657 | struct comedi_insnlist insnlist; |
90035c08 | 658 | struct comedi_insn *insns = NULL; |
790c5541 | 659 | unsigned int *data = NULL; |
ed9eccbe DS |
660 | int i = 0; |
661 | int ret = 0; | |
662 | ||
da613f4f | 663 | if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
ed9eccbe DS |
664 | return -EFAULT; |
665 | ||
790c5541 | 666 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
667 | if (!data) { |
668 | DPRINTK("kmalloc failed\n"); | |
669 | ret = -ENOMEM; | |
670 | goto error; | |
671 | } | |
672 | ||
0a85b6f0 MT |
673 | insns = |
674 | kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); | |
ed9eccbe DS |
675 | if (!insns) { |
676 | DPRINTK("kmalloc failed\n"); | |
677 | ret = -ENOMEM; | |
678 | goto error; | |
679 | } | |
680 | ||
681 | if (copy_from_user(insns, insnlist.insns, | |
90035c08 | 682 | sizeof(struct comedi_insn) * insnlist.n_insns)) { |
ed9eccbe DS |
683 | DPRINTK("copy_from_user failed\n"); |
684 | ret = -EFAULT; | |
685 | goto error; | |
686 | } | |
687 | ||
688 | for (i = 0; i < insnlist.n_insns; i++) { | |
689 | if (insns[i].n > MAX_SAMPLES) { | |
690 | DPRINTK("number of samples too large\n"); | |
691 | ret = -EINVAL; | |
692 | goto error; | |
693 | } | |
694 | if (insns[i].insn & INSN_MASK_WRITE) { | |
695 | if (copy_from_user(data, insns[i].data, | |
790c5541 | 696 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
697 | DPRINTK("copy_from_user failed\n"); |
698 | ret = -EFAULT; | |
699 | goto error; | |
700 | } | |
701 | } | |
702 | ret = parse_insn(dev, insns + i, data, file); | |
703 | if (ret < 0) | |
704 | goto error; | |
705 | if (insns[i].insn & INSN_MASK_READ) { | |
706 | if (copy_to_user(insns[i].data, data, | |
790c5541 | 707 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
708 | DPRINTK("copy_to_user failed\n"); |
709 | ret = -EFAULT; | |
710 | goto error; | |
711 | } | |
712 | } | |
713 | if (need_resched()) | |
714 | schedule(); | |
715 | } | |
716 | ||
476b8477 GKH |
717 | error: |
718 | kfree(insns); | |
719 | kfree(data); | |
ed9eccbe DS |
720 | |
721 | if (ret < 0) | |
722 | return ret; | |
723 | return i; | |
724 | } | |
725 | ||
0a85b6f0 MT |
726 | static int check_insn_config_length(struct comedi_insn *insn, |
727 | unsigned int *data) | |
ed9eccbe | 728 | { |
476b8477 GKH |
729 | if (insn->n < 1) |
730 | return -EINVAL; | |
ed9eccbe DS |
731 | |
732 | switch (data[0]) { | |
733 | case INSN_CONFIG_DIO_OUTPUT: | |
734 | case INSN_CONFIG_DIO_INPUT: | |
735 | case INSN_CONFIG_DISARM: | |
736 | case INSN_CONFIG_RESET: | |
737 | if (insn->n == 1) | |
738 | return 0; | |
739 | break; | |
740 | case INSN_CONFIG_ARM: | |
741 | case INSN_CONFIG_DIO_QUERY: | |
742 | case INSN_CONFIG_BLOCK_SIZE: | |
743 | case INSN_CONFIG_FILTER: | |
744 | case INSN_CONFIG_SERIAL_CLOCK: | |
745 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
746 | case INSN_CONFIG_ALT_SOURCE: | |
747 | case INSN_CONFIG_SET_COUNTER_MODE: | |
748 | case INSN_CONFIG_8254_READ_STATUS: | |
749 | case INSN_CONFIG_SET_ROUTING: | |
750 | case INSN_CONFIG_GET_ROUTING: | |
751 | case INSN_CONFIG_GET_PWM_STATUS: | |
752 | case INSN_CONFIG_PWM_SET_PERIOD: | |
753 | case INSN_CONFIG_PWM_GET_PERIOD: | |
754 | if (insn->n == 2) | |
755 | return 0; | |
756 | break; | |
757 | case INSN_CONFIG_SET_GATE_SRC: | |
758 | case INSN_CONFIG_GET_GATE_SRC: | |
759 | case INSN_CONFIG_SET_CLOCK_SRC: | |
760 | case INSN_CONFIG_GET_CLOCK_SRC: | |
761 | case INSN_CONFIG_SET_OTHER_SRC: | |
762 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
763 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
764 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
765 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
766 | if (insn->n == 3) | |
767 | return 0; | |
768 | break; | |
769 | case INSN_CONFIG_PWM_OUTPUT: | |
770 | case INSN_CONFIG_ANALOG_TRIG: | |
771 | if (insn->n == 5) | |
772 | return 0; | |
773 | break; | |
0a85b6f0 MT |
774 | /* by default we allow the insn since we don't have checks for |
775 | * all possible cases yet */ | |
ed9eccbe | 776 | default: |
3fffdf20 MR |
777 | printk(KERN_WARNING |
778 | "comedi: no check for data length of config insn id " | |
0a85b6f0 MT |
779 | "%i is implemented.\n" |
780 | " Add a check to %s in %s.\n" | |
781 | " Assuming n=%i is correct.\n", data[0], __func__, | |
782 | __FILE__, insn->n); | |
ed9eccbe DS |
783 | return 0; |
784 | break; | |
785 | } | |
786 | return -EINVAL; | |
787 | } | |
788 | ||
0a85b6f0 MT |
789 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
790 | unsigned int *data, void *file) | |
ed9eccbe | 791 | { |
34c43922 | 792 | struct comedi_subdevice *s; |
ed9eccbe DS |
793 | int ret = 0; |
794 | int i; | |
795 | ||
796 | if (insn->insn & INSN_MASK_SPECIAL) { | |
797 | /* a non-subdevice instruction */ | |
798 | ||
799 | switch (insn->insn) { | |
800 | case INSN_GTOD: | |
801 | { | |
802 | struct timeval tv; | |
803 | ||
804 | if (insn->n != 2) { | |
805 | ret = -EINVAL; | |
806 | break; | |
807 | } | |
808 | ||
809 | do_gettimeofday(&tv); | |
810 | data[0] = tv.tv_sec; | |
811 | data[1] = tv.tv_usec; | |
812 | ret = 2; | |
813 | ||
814 | break; | |
815 | } | |
816 | case INSN_WAIT: | |
817 | if (insn->n != 1 || data[0] >= 100000) { | |
818 | ret = -EINVAL; | |
819 | break; | |
820 | } | |
821 | udelay(data[0] / 1000); | |
822 | ret = 1; | |
823 | break; | |
824 | case INSN_INTTRIG: | |
825 | if (insn->n != 1) { | |
826 | ret = -EINVAL; | |
827 | break; | |
828 | } | |
829 | if (insn->subdev >= dev->n_subdevices) { | |
830 | DPRINTK("%d not usable subdevice\n", | |
831 | insn->subdev); | |
832 | ret = -EINVAL; | |
833 | break; | |
834 | } | |
835 | s = dev->subdevices + insn->subdev; | |
836 | if (!s->async) { | |
837 | DPRINTK("no async\n"); | |
838 | ret = -EINVAL; | |
839 | break; | |
840 | } | |
841 | if (!s->async->inttrig) { | |
842 | DPRINTK("no inttrig\n"); | |
843 | ret = -EAGAIN; | |
844 | break; | |
845 | } | |
846 | ret = s->async->inttrig(dev, s, insn->data[0]); | |
847 | if (ret >= 0) | |
848 | ret = 1; | |
849 | break; | |
850 | default: | |
851 | DPRINTK("invalid insn\n"); | |
852 | ret = -EINVAL; | |
853 | break; | |
854 | } | |
855 | } else { | |
856 | /* a subdevice instruction */ | |
790c5541 | 857 | unsigned int maxdata; |
ed9eccbe DS |
858 | |
859 | if (insn->subdev >= dev->n_subdevices) { | |
860 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
861 | ret = -EINVAL; | |
862 | goto out; | |
863 | } | |
864 | s = dev->subdevices + insn->subdev; | |
865 | ||
866 | if (s->type == COMEDI_SUBD_UNUSED) { | |
867 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
868 | ret = -EIO; | |
869 | goto out; | |
870 | } | |
871 | ||
872 | /* are we locked? (ioctl lock) */ | |
873 | if (s->lock && s->lock != file) { | |
874 | DPRINTK("device locked\n"); | |
875 | ret = -EACCES; | |
876 | goto out; | |
877 | } | |
878 | ||
0fd0ca75 | 879 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 880 | if (ret < 0) { |
ed9eccbe DS |
881 | ret = -EINVAL; |
882 | DPRINTK("bad chanspec\n"); | |
883 | goto out; | |
884 | } | |
885 | ||
886 | if (s->busy) { | |
887 | ret = -EBUSY; | |
888 | goto out; | |
889 | } | |
890 | /* This looks arbitrary. It is. */ | |
891 | s->busy = &parse_insn; | |
892 | switch (insn->insn) { | |
893 | case INSN_READ: | |
894 | ret = s->insn_read(dev, s, insn, data); | |
895 | break; | |
896 | case INSN_WRITE: | |
897 | maxdata = s->maxdata_list | |
476b8477 GKH |
898 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
899 | : s->maxdata; | |
ed9eccbe DS |
900 | for (i = 0; i < insn->n; ++i) { |
901 | if (data[i] > maxdata) { | |
902 | ret = -EINVAL; | |
903 | DPRINTK("bad data value(s)\n"); | |
904 | break; | |
905 | } | |
906 | } | |
907 | if (ret == 0) | |
908 | ret = s->insn_write(dev, s, insn, data); | |
909 | break; | |
910 | case INSN_BITS: | |
911 | if (insn->n != 2) { | |
912 | ret = -EINVAL; | |
2f644ccf IA |
913 | } else { |
914 | /* Most drivers ignore the base channel in | |
915 | * insn->chanspec. Fix this here if | |
916 | * the subdevice has <= 32 channels. */ | |
917 | unsigned int shift; | |
918 | unsigned int orig_mask; | |
919 | ||
920 | orig_mask = data[0]; | |
921 | if (s->n_chan <= 32) { | |
922 | shift = CR_CHAN(insn->chanspec); | |
923 | if (shift > 0) { | |
924 | insn->chanspec = 0; | |
925 | data[0] <<= shift; | |
926 | data[1] <<= shift; | |
927 | } | |
928 | } else | |
929 | shift = 0; | |
930 | ret = s->insn_bits(dev, s, insn, data); | |
931 | data[0] = orig_mask; | |
932 | if (shift > 0) | |
933 | data[1] >>= shift; | |
ed9eccbe | 934 | } |
ed9eccbe DS |
935 | break; |
936 | case INSN_CONFIG: | |
937 | ret = check_insn_config_length(insn, data); | |
938 | if (ret) | |
939 | break; | |
940 | ret = s->insn_config(dev, s, insn, data); | |
941 | break; | |
942 | default: | |
943 | ret = -EINVAL; | |
944 | break; | |
945 | } | |
946 | ||
947 | s->busy = NULL; | |
948 | } | |
949 | ||
476b8477 | 950 | out: |
ed9eccbe DS |
951 | return ret; |
952 | } | |
953 | ||
954 | /* | |
20617f22 PDP |
955 | * COMEDI_INSN |
956 | * synchronous instructions | |
ed9eccbe | 957 | * |
20617f22 PDP |
958 | * arg: |
959 | * pointer to insn | |
ed9eccbe | 960 | * |
20617f22 PDP |
961 | * reads: |
962 | * struct comedi_insn struct at arg | |
963 | * data (for writes) | |
ed9eccbe | 964 | * |
20617f22 PDP |
965 | * writes: |
966 | * data (for reads) | |
ed9eccbe | 967 | */ |
92d0127c GKH |
968 | static int do_insn_ioctl(struct comedi_device *dev, |
969 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 970 | { |
90035c08 | 971 | struct comedi_insn insn; |
790c5541 | 972 | unsigned int *data = NULL; |
ed9eccbe DS |
973 | int ret = 0; |
974 | ||
790c5541 | 975 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
976 | if (!data) { |
977 | ret = -ENOMEM; | |
978 | goto error; | |
979 | } | |
980 | ||
90035c08 | 981 | if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
ed9eccbe DS |
982 | ret = -EFAULT; |
983 | goto error; | |
984 | } | |
985 | ||
986 | /* This is where the behavior of insn and insnlist deviate. */ | |
987 | if (insn.n > MAX_SAMPLES) | |
988 | insn.n = MAX_SAMPLES; | |
989 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
990 | if (copy_from_user(data, |
991 | insn.data, | |
992 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
993 | ret = -EFAULT; |
994 | goto error; | |
995 | } | |
996 | } | |
997 | ret = parse_insn(dev, &insn, data, file); | |
998 | if (ret < 0) | |
999 | goto error; | |
1000 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1001 | if (copy_to_user(insn.data, |
1002 | data, | |
1003 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1004 | ret = -EFAULT; |
1005 | goto error; | |
1006 | } | |
1007 | } | |
1008 | ret = insn.n; | |
1009 | ||
476b8477 GKH |
1010 | error: |
1011 | kfree(data); | |
ed9eccbe DS |
1012 | |
1013 | return ret; | |
1014 | } | |
1015 | ||
181bd67b GKH |
1016 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
1017 | unsigned mask, unsigned bits) | |
1018 | { | |
1019 | unsigned long flags; | |
1020 | ||
1021 | spin_lock_irqsave(&s->spin_lock, flags); | |
1022 | s->runflags &= ~mask; | |
1023 | s->runflags |= (bits & mask); | |
1024 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
1025 | } | |
1026 | ||
92d0127c GKH |
1027 | static int do_cmd_ioctl(struct comedi_device *dev, |
1028 | struct comedi_cmd __user *cmd, void *file) | |
ed9eccbe | 1029 | { |
ea6d0d4c | 1030 | struct comedi_cmd user_cmd; |
34c43922 | 1031 | struct comedi_subdevice *s; |
d163679c | 1032 | struct comedi_async *async; |
ed9eccbe | 1033 | int ret = 0; |
92d0127c | 1034 | unsigned int __user *chanlist_saver = NULL; |
ed9eccbe | 1035 | |
92d0127c | 1036 | if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1037 | DPRINTK("bad cmd address\n"); |
1038 | return -EFAULT; | |
1039 | } | |
476b8477 | 1040 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1041 | chanlist_saver = user_cmd.chanlist; |
1042 | ||
1043 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1044 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1045 | return -ENODEV; | |
1046 | } | |
1047 | ||
1048 | s = dev->subdevices + user_cmd.subdev; | |
1049 | async = s->async; | |
1050 | ||
1051 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1052 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1053 | return -EIO; | |
1054 | } | |
1055 | ||
1056 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1057 | DPRINTK("subdevice %i does not support commands\n", | |
1058 | user_cmd.subdev); | |
1059 | return -EIO; | |
1060 | } | |
1061 | ||
1062 | /* are we locked? (ioctl lock) */ | |
1063 | if (s->lock && s->lock != file) { | |
1064 | DPRINTK("subdevice locked\n"); | |
1065 | return -EACCES; | |
1066 | } | |
1067 | ||
1068 | /* are we busy? */ | |
1069 | if (s->busy) { | |
1070 | DPRINTK("subdevice busy\n"); | |
1071 | return -EBUSY; | |
1072 | } | |
1073 | s->busy = file; | |
1074 | ||
1075 | /* make sure channel/gain list isn't too long */ | |
1076 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1077 | DPRINTK("channel/gain list too long %u > %d\n", | |
1078 | user_cmd.chanlist_len, s->len_chanlist); | |
1079 | ret = -EINVAL; | |
1080 | goto cleanup; | |
1081 | } | |
1082 | ||
1083 | /* make sure channel/gain list isn't too short */ | |
1084 | if (user_cmd.chanlist_len < 1) { | |
1085 | DPRINTK("channel/gain list too short %u < 1\n", | |
1086 | user_cmd.chanlist_len); | |
1087 | ret = -EINVAL; | |
1088 | goto cleanup; | |
1089 | } | |
1090 | ||
476b8477 | 1091 | kfree(async->cmd.chanlist); |
ed9eccbe DS |
1092 | async->cmd = user_cmd; |
1093 | async->cmd.data = NULL; | |
1094 | /* load channel/gain list */ | |
1095 | async->cmd.chanlist = | |
476b8477 | 1096 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1097 | if (!async->cmd.chanlist) { |
1098 | DPRINTK("allocation failed\n"); | |
1099 | ret = -ENOMEM; | |
1100 | goto cleanup; | |
1101 | } | |
1102 | ||
1103 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, | |
476b8477 | 1104 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1105 | DPRINTK("fault reading chanlist\n"); |
1106 | ret = -EFAULT; | |
1107 | goto cleanup; | |
1108 | } | |
1109 | ||
1110 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1111 | ret = comedi_check_chanlist(s, |
1112 | async->cmd.chanlist_len, | |
1113 | async->cmd.chanlist); | |
476b8477 | 1114 | if (ret < 0) { |
ed9eccbe DS |
1115 | DPRINTK("bad chanlist\n"); |
1116 | goto cleanup; | |
1117 | } | |
1118 | ||
1119 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1120 | ||
1121 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1122 | DPRINTK("test returned %d\n", ret); | |
1123 | user_cmd = async->cmd; | |
476b8477 | 1124 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1125 | user_cmd.chanlist = chanlist_saver; |
1126 | user_cmd.data = NULL; | |
92d0127c | 1127 | if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1128 | DPRINTK("fault writing cmd\n"); |
1129 | ret = -EFAULT; | |
1130 | goto cleanup; | |
1131 | } | |
1132 | ret = -EAGAIN; | |
1133 | goto cleanup; | |
1134 | } | |
1135 | ||
1136 | if (!async->prealloc_bufsz) { | |
1137 | ret = -ENOMEM; | |
1138 | DPRINTK("no buffer (?)\n"); | |
1139 | goto cleanup; | |
1140 | } | |
1141 | ||
1142 | comedi_reset_async_buf(async); | |
1143 | ||
1144 | async->cb_mask = | |
476b8477 GKH |
1145 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1146 | COMEDI_CB_OVERFLOW; | |
1147 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1148 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1149 | |
1150 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1151 | ||
ed9eccbe DS |
1152 | ret = s->do_cmd(dev, s); |
1153 | if (ret == 0) | |
1154 | return 0; | |
1155 | ||
476b8477 | 1156 | cleanup: |
ed9eccbe DS |
1157 | do_become_nonbusy(dev, s); |
1158 | ||
1159 | return ret; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | COMEDI_CMDTEST | |
1164 | command testing ioctl | |
1165 | ||
1166 | arg: | |
1167 | pointer to cmd structure | |
1168 | ||
1169 | reads: | |
1170 | cmd structure at arg | |
1171 | channel/range list | |
1172 | ||
1173 | writes: | |
1174 | modified cmd structure at arg | |
1175 | ||
1176 | */ | |
92d0127c GKH |
1177 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1178 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1179 | { |
ea6d0d4c | 1180 | struct comedi_cmd user_cmd; |
34c43922 | 1181 | struct comedi_subdevice *s; |
ed9eccbe DS |
1182 | int ret = 0; |
1183 | unsigned int *chanlist = NULL; | |
92d0127c | 1184 | unsigned int __user *chanlist_saver = NULL; |
ed9eccbe | 1185 | |
ea6d0d4c | 1186 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1187 | DPRINTK("bad cmd address\n"); |
1188 | return -EFAULT; | |
1189 | } | |
476b8477 | 1190 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1191 | chanlist_saver = user_cmd.chanlist; |
1192 | ||
1193 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1194 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1195 | return -ENODEV; | |
1196 | } | |
1197 | ||
1198 | s = dev->subdevices + user_cmd.subdev; | |
1199 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1200 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1201 | return -EIO; | |
1202 | } | |
1203 | ||
1204 | if (!s->do_cmd || !s->do_cmdtest) { | |
1205 | DPRINTK("subdevice %i does not support commands\n", | |
1206 | user_cmd.subdev); | |
1207 | return -EIO; | |
1208 | } | |
1209 | ||
1210 | /* make sure channel/gain list isn't too long */ | |
1211 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1212 | DPRINTK("channel/gain list too long %d > %d\n", | |
1213 | user_cmd.chanlist_len, s->len_chanlist); | |
1214 | ret = -EINVAL; | |
1215 | goto cleanup; | |
1216 | } | |
1217 | ||
1218 | /* load channel/gain list */ | |
1219 | if (user_cmd.chanlist) { | |
1220 | chanlist = | |
476b8477 | 1221 | kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1222 | if (!chanlist) { |
1223 | DPRINTK("allocation failed\n"); | |
1224 | ret = -ENOMEM; | |
1225 | goto cleanup; | |
1226 | } | |
1227 | ||
1228 | if (copy_from_user(chanlist, user_cmd.chanlist, | |
476b8477 | 1229 | user_cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1230 | DPRINTK("fault reading chanlist\n"); |
1231 | ret = -EFAULT; | |
1232 | goto cleanup; | |
1233 | } | |
1234 | ||
1235 | /* make sure each element in channel/gain list is valid */ | |
0fd0ca75 | 1236 | ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); |
476b8477 | 1237 | if (ret < 0) { |
ed9eccbe DS |
1238 | DPRINTK("bad chanlist\n"); |
1239 | goto cleanup; | |
1240 | } | |
1241 | ||
1242 | user_cmd.chanlist = chanlist; | |
1243 | } | |
1244 | ||
1245 | ret = s->do_cmdtest(dev, s, &user_cmd); | |
1246 | ||
476b8477 | 1247 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1248 | user_cmd.chanlist = chanlist_saver; |
1249 | ||
ea6d0d4c | 1250 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1251 | DPRINTK("bad cmd address\n"); |
1252 | ret = -EFAULT; | |
1253 | goto cleanup; | |
1254 | } | |
476b8477 GKH |
1255 | cleanup: |
1256 | kfree(chanlist); | |
ed9eccbe DS |
1257 | |
1258 | return ret; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | COMEDI_LOCK | |
1263 | lock subdevice | |
1264 | ||
1265 | arg: | |
1266 | subdevice number | |
1267 | ||
1268 | reads: | |
1269 | none | |
1270 | ||
1271 | writes: | |
1272 | none | |
1273 | ||
1274 | */ | |
1275 | ||
0a85b6f0 MT |
1276 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1277 | void *file) | |
ed9eccbe DS |
1278 | { |
1279 | int ret = 0; | |
1280 | unsigned long flags; | |
34c43922 | 1281 | struct comedi_subdevice *s; |
ed9eccbe DS |
1282 | |
1283 | if (arg >= dev->n_subdevices) | |
1284 | return -EINVAL; | |
1285 | s = dev->subdevices + arg; | |
1286 | ||
5f74ea14 | 1287 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1288 | if (s->busy || s->lock) |
ed9eccbe | 1289 | ret = -EBUSY; |
476b8477 | 1290 | else |
ed9eccbe | 1291 | s->lock = file; |
5f74ea14 | 1292 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
1293 | |
1294 | if (ret < 0) | |
1295 | return ret; | |
1296 | ||
1297 | #if 0 | |
1298 | if (s->lock_f) | |
1299 | ret = s->lock_f(dev, s); | |
1300 | #endif | |
1301 | ||
1302 | return ret; | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | COMEDI_UNLOCK | |
1307 | unlock subdevice | |
1308 | ||
1309 | arg: | |
1310 | subdevice number | |
1311 | ||
1312 | reads: | |
1313 | none | |
1314 | ||
1315 | writes: | |
1316 | none | |
1317 | ||
1318 | This function isn't protected by the semaphore, since | |
1319 | we already own the lock. | |
1320 | */ | |
0a85b6f0 MT |
1321 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1322 | void *file) | |
ed9eccbe | 1323 | { |
34c43922 | 1324 | struct comedi_subdevice *s; |
ed9eccbe DS |
1325 | |
1326 | if (arg >= dev->n_subdevices) | |
1327 | return -EINVAL; | |
1328 | s = dev->subdevices + arg; | |
1329 | ||
1330 | if (s->busy) | |
1331 | return -EBUSY; | |
1332 | ||
1333 | if (s->lock && s->lock != file) | |
1334 | return -EACCES; | |
1335 | ||
1336 | if (s->lock == file) { | |
1337 | #if 0 | |
1338 | if (s->unlock) | |
1339 | s->unlock(dev, s); | |
1340 | #endif | |
1341 | ||
1342 | s->lock = NULL; | |
1343 | } | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | COMEDI_CANCEL | |
1350 | cancel acquisition ioctl | |
1351 | ||
1352 | arg: | |
1353 | subdevice number | |
1354 | ||
1355 | reads: | |
1356 | nothing | |
1357 | ||
1358 | writes: | |
1359 | nothing | |
1360 | ||
1361 | */ | |
0a85b6f0 MT |
1362 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1363 | void *file) | |
ed9eccbe | 1364 | { |
34c43922 | 1365 | struct comedi_subdevice *s; |
ed9eccbe DS |
1366 | |
1367 | if (arg >= dev->n_subdevices) | |
1368 | return -EINVAL; | |
1369 | s = dev->subdevices + arg; | |
1370 | if (s->async == NULL) | |
1371 | return -EINVAL; | |
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 | return do_cancel(dev, s); | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | COMEDI_POLL ioctl | |
1387 | instructs driver to synchronize buffers | |
1388 | ||
1389 | arg: | |
1390 | subdevice number | |
1391 | ||
1392 | reads: | |
1393 | nothing | |
1394 | ||
1395 | writes: | |
1396 | nothing | |
1397 | ||
1398 | */ | |
0a85b6f0 MT |
1399 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1400 | void *file) | |
ed9eccbe | 1401 | { |
34c43922 | 1402 | struct comedi_subdevice *s; |
ed9eccbe DS |
1403 | |
1404 | if (arg >= dev->n_subdevices) | |
1405 | return -EINVAL; | |
1406 | s = dev->subdevices + arg; | |
1407 | ||
1408 | if (s->lock && s->lock != file) | |
1409 | return -EACCES; | |
1410 | ||
1411 | if (!s->busy) | |
1412 | return 0; | |
1413 | ||
1414 | if (s->busy != file) | |
1415 | return -EBUSY; | |
1416 | ||
1417 | if (s->poll) | |
1418 | return s->poll(dev, s); | |
1419 | ||
1420 | return -EINVAL; | |
1421 | } | |
1422 | ||
34c43922 | 1423 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
1424 | { |
1425 | int ret = 0; | |
1426 | ||
1427 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) | |
1428 | ret = s->cancel(dev, s); | |
1429 | ||
1430 | do_become_nonbusy(dev, s); | |
1431 | ||
1432 | return ret; | |
1433 | } | |
1434 | ||
92d0127c | 1435 | static void comedi_unmap(struct vm_area_struct *area) |
ed9eccbe | 1436 | { |
d163679c | 1437 | struct comedi_async *async; |
71b5f4f1 | 1438 | struct comedi_device *dev; |
ed9eccbe DS |
1439 | |
1440 | async = area->vm_private_data; | |
1441 | dev = async->subdevice->device; | |
1442 | ||
1443 | mutex_lock(&dev->mutex); | |
1444 | async->mmap_count--; | |
1445 | mutex_unlock(&dev->mutex); | |
1446 | } | |
1447 | ||
1448 | static struct vm_operations_struct comedi_vm_ops = { | |
0a85b6f0 | 1449 | .close = comedi_unmap, |
ed9eccbe DS |
1450 | }; |
1451 | ||
1452 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1453 | { | |
1454 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1455 | struct comedi_device_file_info *dev_file_info = |
1456 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1457 | struct comedi_device *dev = dev_file_info->device; |
d163679c | 1458 | struct comedi_async *async = NULL; |
ed9eccbe DS |
1459 | unsigned long start = vma->vm_start; |
1460 | unsigned long size; | |
1461 | int n_pages; | |
1462 | int i; | |
1463 | int retval; | |
34c43922 | 1464 | struct comedi_subdevice *s; |
ed9eccbe DS |
1465 | |
1466 | mutex_lock(&dev->mutex); | |
1467 | if (!dev->attached) { | |
1468 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1469 | retval = -ENODEV; | |
1470 | goto done; | |
1471 | } | |
476b8477 | 1472 | if (vma->vm_flags & VM_WRITE) |
ed9eccbe | 1473 | s = comedi_get_write_subdevice(dev_file_info); |
476b8477 | 1474 | else |
ed9eccbe | 1475 | s = comedi_get_read_subdevice(dev_file_info); |
476b8477 | 1476 | |
ed9eccbe DS |
1477 | if (s == NULL) { |
1478 | retval = -EINVAL; | |
1479 | goto done; | |
1480 | } | |
1481 | async = s->async; | |
1482 | if (async == NULL) { | |
1483 | retval = -EINVAL; | |
1484 | goto done; | |
1485 | } | |
1486 | ||
1487 | if (vma->vm_pgoff != 0) { | |
1488 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1489 | retval = -EINVAL; | |
1490 | goto done; | |
1491 | } | |
1492 | ||
1493 | size = vma->vm_end - vma->vm_start; | |
1494 | if (size > async->prealloc_bufsz) { | |
1495 | retval = -EFAULT; | |
1496 | goto done; | |
1497 | } | |
1498 | if (size & (~PAGE_MASK)) { | |
1499 | retval = -EFAULT; | |
1500 | goto done; | |
1501 | } | |
1502 | ||
1503 | n_pages = size >> PAGE_SHIFT; | |
1504 | for (i = 0; i < n_pages; ++i) { | |
1505 | if (remap_pfn_range(vma, start, | |
0a85b6f0 MT |
1506 | page_to_pfn(virt_to_page |
1507 | (async->buf_page_list | |
1508 | [i].virt_addr)), PAGE_SIZE, | |
1509 | PAGE_SHARED)) { | |
ed9eccbe DS |
1510 | retval = -EAGAIN; |
1511 | goto done; | |
1512 | } | |
1513 | start += PAGE_SIZE; | |
1514 | } | |
1515 | ||
1516 | vma->vm_ops = &comedi_vm_ops; | |
1517 | vma->vm_private_data = async; | |
1518 | ||
1519 | async->mmap_count++; | |
1520 | ||
1521 | retval = 0; | |
476b8477 | 1522 | done: |
ed9eccbe DS |
1523 | mutex_unlock(&dev->mutex); |
1524 | return retval; | |
1525 | } | |
1526 | ||
0a85b6f0 | 1527 | static unsigned int comedi_poll(struct file *file, poll_table * wait) |
ed9eccbe DS |
1528 | { |
1529 | unsigned int mask = 0; | |
1530 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1531 | struct comedi_device_file_info *dev_file_info = |
1532 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1533 | struct comedi_device *dev = dev_file_info->device; |
34c43922 BP |
1534 | struct comedi_subdevice *read_subdev; |
1535 | struct comedi_subdevice *write_subdev; | |
ed9eccbe DS |
1536 | |
1537 | mutex_lock(&dev->mutex); | |
1538 | if (!dev->attached) { | |
1539 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1540 | mutex_unlock(&dev->mutex); | |
1541 | return 0; | |
1542 | } | |
1543 | ||
1544 | mask = 0; | |
1545 | read_subdev = comedi_get_read_subdevice(dev_file_info); | |
1546 | if (read_subdev) { | |
1547 | poll_wait(file, &read_subdev->async->wait_head, wait); | |
1548 | if (!read_subdev->busy | |
476b8477 GKH |
1549 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
1550 | || !(comedi_get_subdevice_runflags(read_subdev) & | |
1551 | SRF_RUNNING)) { | |
ed9eccbe DS |
1552 | mask |= POLLIN | POLLRDNORM; |
1553 | } | |
1554 | } | |
1555 | write_subdev = comedi_get_write_subdevice(dev_file_info); | |
1556 | if (write_subdev) { | |
1557 | poll_wait(file, &write_subdev->async->wait_head, wait); | |
476b8477 GKH |
1558 | comedi_buf_write_alloc(write_subdev->async, |
1559 | write_subdev->async->prealloc_bufsz); | |
ed9eccbe | 1560 | if (!write_subdev->busy |
476b8477 GKH |
1561 | || !(comedi_get_subdevice_runflags(write_subdev) & |
1562 | SRF_RUNNING) | |
1563 | || comedi_buf_write_n_allocated(write_subdev->async) >= | |
1564 | bytes_per_sample(write_subdev->async->subdevice)) { | |
ed9eccbe DS |
1565 | mask |= POLLOUT | POLLWRNORM; |
1566 | } | |
1567 | } | |
1568 | ||
1569 | mutex_unlock(&dev->mutex); | |
1570 | return mask; | |
1571 | } | |
1572 | ||
92d0127c GKH |
1573 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
1574 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 1575 | { |
34c43922 | 1576 | struct comedi_subdevice *s; |
d163679c | 1577 | struct comedi_async *async; |
ed9eccbe DS |
1578 | int n, m, count = 0, retval = 0; |
1579 | DECLARE_WAITQUEUE(wait, current); | |
1580 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1581 | struct comedi_device_file_info *dev_file_info = |
1582 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1583 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1584 | |
1585 | if (!dev->attached) { | |
1586 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1587 | retval = -ENODEV; | |
1588 | goto done; | |
1589 | } | |
1590 | ||
1591 | s = comedi_get_write_subdevice(dev_file_info); | |
1592 | if (s == NULL) { | |
1593 | retval = -EIO; | |
1594 | goto done; | |
1595 | } | |
1596 | async = s->async; | |
1597 | ||
1598 | if (!nbytes) { | |
1599 | retval = 0; | |
1600 | goto done; | |
1601 | } | |
1602 | if (!s->busy) { | |
1603 | retval = 0; | |
1604 | goto done; | |
1605 | } | |
1606 | if (s->busy != file) { | |
1607 | retval = -EACCES; | |
1608 | goto done; | |
1609 | } | |
1610 | add_wait_queue(&async->wait_head, &wait); | |
1611 | while (nbytes > 0 && !retval) { | |
1612 | set_current_state(TASK_INTERRUPTIBLE); | |
1613 | ||
d2611540 IA |
1614 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
1615 | if (count == 0) { | |
1616 | if (comedi_get_subdevice_runflags(s) & | |
1617 | SRF_ERROR) { | |
1618 | retval = -EPIPE; | |
1619 | } else { | |
1620 | retval = 0; | |
1621 | } | |
1622 | do_become_nonbusy(dev, s); | |
1623 | } | |
1624 | break; | |
1625 | } | |
1626 | ||
ed9eccbe DS |
1627 | n = nbytes; |
1628 | ||
1629 | m = n; | |
476b8477 | 1630 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1631 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1632 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1633 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1634 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1635 | if (m < n) |
1636 | n = m; | |
1637 | ||
1638 | if (n == 0) { | |
ed9eccbe DS |
1639 | if (file->f_flags & O_NONBLOCK) { |
1640 | retval = -EAGAIN; | |
1641 | break; | |
1642 | } | |
1643 | if (signal_pending(current)) { | |
1644 | retval = -ERESTARTSYS; | |
1645 | break; | |
1646 | } | |
1647 | schedule(); | |
476b8477 | 1648 | if (!s->busy) |
ed9eccbe | 1649 | break; |
ed9eccbe DS |
1650 | if (s->busy != file) { |
1651 | retval = -EACCES; | |
1652 | break; | |
1653 | } | |
1654 | continue; | |
1655 | } | |
1656 | ||
1657 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1658 | buf, n); |
ed9eccbe DS |
1659 | if (m) { |
1660 | n -= m; | |
1661 | retval = -EFAULT; | |
1662 | } | |
1663 | comedi_buf_write_free(async, n); | |
1664 | ||
1665 | count += n; | |
1666 | nbytes -= n; | |
1667 | ||
1668 | buf += n; | |
1669 | break; /* makes device work like a pipe */ | |
1670 | } | |
1671 | set_current_state(TASK_RUNNING); | |
1672 | remove_wait_queue(&async->wait_head, &wait); | |
1673 | ||
1674 | done: | |
476b8477 | 1675 | return count ? count : retval; |
ed9eccbe DS |
1676 | } |
1677 | ||
92d0127c | 1678 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 1679 | loff_t *offset) |
ed9eccbe | 1680 | { |
34c43922 | 1681 | struct comedi_subdevice *s; |
d163679c | 1682 | struct comedi_async *async; |
ed9eccbe DS |
1683 | int n, m, count = 0, retval = 0; |
1684 | DECLARE_WAITQUEUE(wait, current); | |
1685 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1686 | struct comedi_device_file_info *dev_file_info = |
1687 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1688 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1689 | |
1690 | if (!dev->attached) { | |
1691 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1692 | retval = -ENODEV; | |
1693 | goto done; | |
1694 | } | |
1695 | ||
1696 | s = comedi_get_read_subdevice(dev_file_info); | |
1697 | if (s == NULL) { | |
1698 | retval = -EIO; | |
1699 | goto done; | |
1700 | } | |
1701 | async = s->async; | |
1702 | if (!nbytes) { | |
1703 | retval = 0; | |
1704 | goto done; | |
1705 | } | |
1706 | if (!s->busy) { | |
1707 | retval = 0; | |
1708 | goto done; | |
1709 | } | |
1710 | if (s->busy != file) { | |
1711 | retval = -EACCES; | |
1712 | goto done; | |
1713 | } | |
1714 | ||
1715 | add_wait_queue(&async->wait_head, &wait); | |
1716 | while (nbytes > 0 && !retval) { | |
1717 | set_current_state(TASK_INTERRUPTIBLE); | |
1718 | ||
1719 | n = nbytes; | |
1720 | ||
1721 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
1722 | /* printk("%d available\n",m); */ |
1723 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 1724 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 1725 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
1726 | if (m < n) |
1727 | n = m; | |
1728 | ||
1729 | if (n == 0) { | |
1730 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1731 | do_become_nonbusy(dev, s); | |
1732 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1733 | SRF_ERROR) { |
ed9eccbe DS |
1734 | retval = -EPIPE; |
1735 | } else { | |
1736 | retval = 0; | |
1737 | } | |
1738 | break; | |
1739 | } | |
1740 | if (file->f_flags & O_NONBLOCK) { | |
1741 | retval = -EAGAIN; | |
1742 | break; | |
1743 | } | |
1744 | if (signal_pending(current)) { | |
1745 | retval = -ERESTARTSYS; | |
1746 | break; | |
1747 | } | |
1748 | schedule(); | |
1749 | if (!s->busy) { | |
1750 | retval = 0; | |
1751 | break; | |
1752 | } | |
1753 | if (s->busy != file) { | |
1754 | retval = -EACCES; | |
1755 | break; | |
1756 | } | |
1757 | continue; | |
1758 | } | |
1759 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 1760 | async->buf_read_ptr, n); |
ed9eccbe DS |
1761 | if (m) { |
1762 | n -= m; | |
1763 | retval = -EFAULT; | |
1764 | } | |
1765 | ||
1766 | comedi_buf_read_alloc(async, n); | |
1767 | comedi_buf_read_free(async, n); | |
1768 | ||
1769 | count += n; | |
1770 | nbytes -= n; | |
1771 | ||
1772 | buf += n; | |
1773 | break; /* makes device work like a pipe */ | |
1774 | } | |
1775 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && | |
476b8477 | 1776 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
1777 | do_become_nonbusy(dev, s); |
1778 | } | |
1779 | set_current_state(TASK_RUNNING); | |
1780 | remove_wait_queue(&async->wait_head, &wait); | |
1781 | ||
1782 | done: | |
476b8477 | 1783 | return count ? count : retval; |
ed9eccbe DS |
1784 | } |
1785 | ||
1786 | /* | |
1787 | This function restores a subdevice to an idle state. | |
1788 | */ | |
34c43922 | 1789 | void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 1790 | { |
d163679c | 1791 | struct comedi_async *async = s->async; |
ed9eccbe DS |
1792 | |
1793 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
ed9eccbe DS |
1794 | if (async) { |
1795 | comedi_reset_async_buf(async); | |
1796 | async->inttrig = NULL; | |
1797 | } else { | |
476b8477 GKH |
1798 | printk(KERN_ERR |
1799 | "BUG: (?) do_become_nonbusy called with async=0\n"); | |
ed9eccbe DS |
1800 | } |
1801 | ||
1802 | s->busy = NULL; | |
1803 | } | |
1804 | ||
1805 | static int comedi_open(struct inode *inode, struct file *file) | |
1806 | { | |
ed9eccbe | 1807 | const unsigned minor = iminor(inode); |
476b8477 GKH |
1808 | struct comedi_device_file_info *dev_file_info = |
1809 | comedi_get_device_file_info(minor); | |
0a85b6f0 MT |
1810 | struct comedi_device *dev = |
1811 | dev_file_info ? dev_file_info->device : NULL; | |
97920071 | 1812 | |
ed9eccbe DS |
1813 | if (dev == NULL) { |
1814 | DPRINTK("invalid minor number\n"); | |
1815 | return -ENODEV; | |
1816 | } | |
1817 | ||
1818 | /* This is slightly hacky, but we want module autoloading | |
1819 | * to work for root. | |
1820 | * case: user opens device, attached -> ok | |
1821 | * case: user opens device, unattached, in_request_module=0 -> autoload | |
1822 | * case: user opens device, unattached, in_request_module=1 -> fail | |
1823 | * case: root opens device, attached -> ok | |
1824 | * case: root opens device, unattached, in_request_module=1 -> ok | |
1825 | * (typically called from modprobe) | |
1826 | * case: root opens device, unattached, in_request_module=0 -> autoload | |
1827 | * | |
1828 | * The last could be changed to "-> ok", which would deny root | |
1829 | * autoloading. | |
1830 | */ | |
1831 | mutex_lock(&dev->mutex); | |
1832 | if (dev->attached) | |
1833 | goto ok; | |
a8f80e8f | 1834 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
1835 | DPRINTK("in request module\n"); |
1836 | mutex_unlock(&dev->mutex); | |
1837 | return -ENODEV; | |
1838 | } | |
a8f80e8f | 1839 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
1840 | goto ok; |
1841 | ||
1842 | dev->in_request_module = 1; | |
1843 | ||
ed9eccbe DS |
1844 | #ifdef CONFIG_KMOD |
1845 | mutex_unlock(&dev->mutex); | |
56d92c60 | 1846 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
1847 | mutex_lock(&dev->mutex); |
1848 | #endif | |
1849 | ||
1850 | dev->in_request_module = 0; | |
1851 | ||
a8f80e8f EP |
1852 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
1853 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
1854 | mutex_unlock(&dev->mutex); |
1855 | return -ENODEV; | |
1856 | } | |
1857 | ok: | |
1858 | __module_get(THIS_MODULE); | |
1859 | ||
1860 | if (dev->attached) { | |
1861 | if (!try_module_get(dev->driver->module)) { | |
1862 | module_put(THIS_MODULE); | |
1863 | mutex_unlock(&dev->mutex); | |
1864 | return -ENOSYS; | |
1865 | } | |
1866 | } | |
1867 | ||
3c17ba07 IA |
1868 | if (dev->attached && dev->use_count == 0 && dev->open) { |
1869 | int rc = dev->open(dev); | |
1870 | if (rc < 0) { | |
1871 | module_put(dev->driver->module); | |
1872 | module_put(THIS_MODULE); | |
1873 | mutex_unlock(&dev->mutex); | |
1874 | return rc; | |
1875 | } | |
1876 | } | |
ed9eccbe DS |
1877 | |
1878 | dev->use_count++; | |
1879 | ||
1880 | mutex_unlock(&dev->mutex); | |
1881 | ||
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | static int comedi_close(struct inode *inode, struct file *file) | |
1886 | { | |
1887 | const unsigned minor = iminor(inode); | |
476b8477 GKH |
1888 | struct comedi_device_file_info *dev_file_info = |
1889 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1890 | struct comedi_device *dev = dev_file_info->device; |
34c43922 | 1891 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
1892 | int i; |
1893 | ||
1894 | mutex_lock(&dev->mutex); | |
1895 | ||
1896 | if (dev->subdevices) { | |
1897 | for (i = 0; i < dev->n_subdevices; i++) { | |
1898 | s = dev->subdevices + i; | |
1899 | ||
476b8477 | 1900 | if (s->busy == file) |
ed9eccbe | 1901 | do_cancel(dev, s); |
476b8477 | 1902 | if (s->lock == file) |
ed9eccbe | 1903 | s->lock = NULL; |
ed9eccbe DS |
1904 | } |
1905 | } | |
476b8477 | 1906 | if (dev->attached && dev->use_count == 1 && dev->close) |
ed9eccbe | 1907 | dev->close(dev); |
ed9eccbe DS |
1908 | |
1909 | module_put(THIS_MODULE); | |
476b8477 | 1910 | if (dev->attached) |
ed9eccbe | 1911 | module_put(dev->driver->module); |
ed9eccbe DS |
1912 | |
1913 | dev->use_count--; | |
1914 | ||
1915 | mutex_unlock(&dev->mutex); | |
1916 | ||
476b8477 | 1917 | if (file->f_flags & FASYNC) |
ed9eccbe | 1918 | comedi_fasync(-1, file, 0); |
ed9eccbe DS |
1919 | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | static int comedi_fasync(int fd, struct file *file, int on) | |
1924 | { | |
1925 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1926 | struct comedi_device_file_info *dev_file_info = |
1927 | comedi_get_device_file_info(minor); | |
1928 | ||
71b5f4f1 | 1929 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1930 | |
1931 | return fasync_helper(fd, file, on, &dev->async_queue); | |
1932 | } | |
1933 | ||
1934 | const struct file_operations comedi_fops = { | |
0a85b6f0 | 1935 | .owner = THIS_MODULE, |
0a85b6f0 | 1936 | .unlocked_ioctl = comedi_unlocked_ioctl, |
0a85b6f0 | 1937 | .compat_ioctl = comedi_compat_ioctl, |
0a85b6f0 MT |
1938 | .open = comedi_open, |
1939 | .release = comedi_close, | |
1940 | .read = comedi_read, | |
1941 | .write = comedi_write, | |
1942 | .mmap = comedi_mmap, | |
1943 | .poll = comedi_poll, | |
1944 | .fasync = comedi_fasync, | |
6038f373 | 1945 | .llseek = noop_llseek, |
ed9eccbe DS |
1946 | }; |
1947 | ||
476b8477 | 1948 | struct class *comedi_class; |
ed9eccbe DS |
1949 | static struct cdev comedi_cdev; |
1950 | ||
1951 | static void comedi_cleanup_legacy_minors(void) | |
1952 | { | |
1953 | unsigned i; | |
476b8477 | 1954 | |
1dd33ab8 | 1955 | for (i = 0; i < comedi_num_legacy_minors; i++) |
ed9eccbe | 1956 | comedi_free_board_minor(i); |
ed9eccbe DS |
1957 | } |
1958 | ||
1959 | static int __init comedi_init(void) | |
1960 | { | |
1961 | int i; | |
1962 | int retval; | |
1963 | ||
476b8477 GKH |
1964 | printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
1965 | " - http://www.comedi.org\n"); | |
ed9eccbe | 1966 | |
a3cb729e FMH |
1967 | if (comedi_num_legacy_minors < 0 || |
1968 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
1969 | printk(KERN_ERR "comedi: error: invalid value for module " | |
1970 | "parameter \"comedi_num_legacy_minors\". Valid values " | |
1971 | "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); | |
1972 | return -EINVAL; | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * comedi is unusable if both comedi_autoconfig and | |
1977 | * comedi_num_legacy_minors are zero, so we might as well adjust the | |
1978 | * defaults in that case | |
1979 | */ | |
1980 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) | |
1981 | comedi_num_legacy_minors = 16; | |
1982 | ||
476b8477 GKH |
1983 | memset(comedi_file_info_table, 0, |
1984 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); | |
ed9eccbe DS |
1985 | |
1986 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1987 | COMEDI_NUM_MINORS, "comedi"); |
ed9eccbe DS |
1988 | if (retval) |
1989 | return -EIO; | |
1990 | cdev_init(&comedi_cdev, &comedi_fops); | |
1991 | comedi_cdev.owner = THIS_MODULE; | |
1992 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
1993 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
1994 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1995 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1996 | return -EIO; |
1997 | } | |
1998 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
1999 | if (IS_ERR(comedi_class)) { | |
3fffdf20 | 2000 | printk(KERN_ERR "comedi: failed to create class"); |
ed9eccbe DS |
2001 | cdev_del(&comedi_cdev); |
2002 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 2003 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
2004 | return PTR_ERR(comedi_class); |
2005 | } | |
2006 | ||
2007 | /* XXX requires /proc interface */ | |
2008 | comedi_proc_init(); | |
2009 | ||
476b8477 | 2010 | /* create devices files for legacy/manual use */ |
1dd33ab8 | 2011 | for (i = 0; i < comedi_num_legacy_minors; i++) { |
ed9eccbe DS |
2012 | int minor; |
2013 | minor = comedi_alloc_board_minor(NULL); | |
476b8477 | 2014 | if (minor < 0) { |
ed9eccbe DS |
2015 | comedi_cleanup_legacy_minors(); |
2016 | cdev_del(&comedi_cdev); | |
2017 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 2018 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
2019 | return minor; |
2020 | } | |
2021 | } | |
2022 | ||
ed9eccbe DS |
2023 | return 0; |
2024 | } | |
2025 | ||
2026 | static void __exit comedi_cleanup(void) | |
2027 | { | |
2028 | int i; | |
2029 | ||
2030 | comedi_cleanup_legacy_minors(); | |
476b8477 | 2031 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
ed9eccbe | 2032 | BUG_ON(comedi_file_info_table[i]); |
476b8477 | 2033 | |
ed9eccbe DS |
2034 | class_destroy(comedi_class); |
2035 | cdev_del(&comedi_cdev); | |
2036 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2037 | ||
2038 | comedi_proc_cleanup(); | |
ed9eccbe DS |
2039 | } |
2040 | ||
2041 | module_init(comedi_init); | |
2042 | module_exit(comedi_cleanup); | |
2043 | ||
71b5f4f1 | 2044 | void comedi_error(const struct comedi_device *dev, const char *s) |
ed9eccbe | 2045 | { |
3fffdf20 MR |
2046 | printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, |
2047 | dev->driver->driver_name, s); | |
ed9eccbe | 2048 | } |
18736438 | 2049 | EXPORT_SYMBOL(comedi_error); |
ed9eccbe | 2050 | |
34c43922 | 2051 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 2052 | { |
d163679c | 2053 | struct comedi_async *async = s->async; |
ed9eccbe DS |
2054 | unsigned runflags = 0; |
2055 | unsigned runflags_mask = 0; | |
2056 | ||
476b8477 | 2057 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
ed9eccbe DS |
2058 | |
2059 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) | |
2060 | return; | |
2061 | ||
0a85b6f0 MT |
2062 | if (s-> |
2063 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2064 | COMEDI_CB_OVERFLOW)) { | |
ed9eccbe DS |
2065 | runflags_mask |= SRF_RUNNING; |
2066 | } | |
25985edc | 2067 | /* remember if an error event has occurred, so an error |
ed9eccbe DS |
2068 | * can be returned the next time the user does a read() */ |
2069 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2070 | runflags_mask |= SRF_ERROR; | |
2071 | runflags |= SRF_ERROR; | |
2072 | } | |
2073 | if (runflags_mask) { | |
2074 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2075 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
2076 | } | |
2077 | ||
2078 | if (async->cb_mask & s->async->events) { | |
2079 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
fcea1154 | 2080 | wake_up_interruptible(&async->wait_head); |
6705b68d | 2081 | if (s->subdev_flags & SDF_CMD_READ) |
0a85b6f0 | 2082 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
6705b68d | 2083 | if (s->subdev_flags & SDF_CMD_WRITE) |
0a85b6f0 | 2084 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); |
ed9eccbe DS |
2085 | } else { |
2086 | if (async->cb_func) | |
2087 | async->cb_func(s->async->events, async->cb_arg); | |
ed9eccbe DS |
2088 | } |
2089 | } | |
2090 | s->async->events = 0; | |
2091 | } | |
18736438 | 2092 | EXPORT_SYMBOL(comedi_event); |
ed9eccbe | 2093 | |
34c43922 | 2094 | unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
ed9eccbe DS |
2095 | { |
2096 | unsigned long flags; | |
2097 | unsigned runflags; | |
2098 | ||
5f74ea14 | 2099 | spin_lock_irqsave(&s->spin_lock, flags); |
ed9eccbe | 2100 | runflags = s->runflags; |
5f74ea14 | 2101 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
2102 | return runflags; |
2103 | } | |
18736438 | 2104 | EXPORT_SYMBOL(comedi_get_subdevice_runflags); |
ed9eccbe | 2105 | |
71b5f4f1 | 2106 | static int is_device_busy(struct comedi_device *dev) |
ed9eccbe | 2107 | { |
34c43922 | 2108 | struct comedi_subdevice *s; |
ed9eccbe DS |
2109 | int i; |
2110 | ||
2111 | if (!dev->attached) | |
2112 | return 0; | |
2113 | ||
2114 | for (i = 0; i < dev->n_subdevices; i++) { | |
2115 | s = dev->subdevices + i; | |
2116 | if (s->busy) | |
2117 | return 1; | |
2118 | if (s->async && s->async->mmap_count) | |
2119 | return 1; | |
2120 | } | |
2121 | ||
2122 | return 0; | |
2123 | } | |
2124 | ||
92d0127c | 2125 | static void comedi_device_init(struct comedi_device *dev) |
ed9eccbe | 2126 | { |
71b5f4f1 | 2127 | memset(dev, 0, sizeof(struct comedi_device)); |
ed9eccbe DS |
2128 | spin_lock_init(&dev->spinlock); |
2129 | mutex_init(&dev->mutex); | |
2130 | dev->minor = -1; | |
2131 | } | |
2132 | ||
92d0127c | 2133 | static void comedi_device_cleanup(struct comedi_device *dev) |
ed9eccbe | 2134 | { |
476b8477 GKH |
2135 | if (dev == NULL) |
2136 | return; | |
ed9eccbe DS |
2137 | mutex_lock(&dev->mutex); |
2138 | comedi_device_detach(dev); | |
2139 | mutex_unlock(&dev->mutex); | |
2140 | mutex_destroy(&dev->mutex); | |
2141 | } | |
2142 | ||
2143 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2144 | { | |
2145 | unsigned long flags; | |
2146 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2147 | struct device *csdev; |
ed9eccbe | 2148 | unsigned i; |
883db3d9 | 2149 | int retval; |
ed9eccbe DS |
2150 | |
2151 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2152 | if (info == NULL) |
2153 | return -ENOMEM; | |
71b5f4f1 | 2154 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
476b8477 | 2155 | if (info->device == NULL) { |
ed9eccbe DS |
2156 | kfree(info); |
2157 | return -ENOMEM; | |
2158 | } | |
2159 | comedi_device_init(info->device); | |
5f74ea14 | 2160 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
476b8477 GKH |
2161 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
2162 | if (comedi_file_info_table[i] == NULL) { | |
ed9eccbe DS |
2163 | comedi_file_info_table[i] = info; |
2164 | break; | |
2165 | } | |
2166 | } | |
5f74ea14 | 2167 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2168 | if (i == COMEDI_NUM_BOARD_MINORS) { |
ed9eccbe DS |
2169 | comedi_device_cleanup(info->device); |
2170 | kfree(info->device); | |
2171 | kfree(info); | |
0a85b6f0 | 2172 | printk(KERN_ERR |
21fe2eea M |
2173 | "comedi: error: " |
2174 | "ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2175 | return -EBUSY; |
2176 | } | |
2177 | info->device->minor = i; | |
2178 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, | |
476b8477 GKH |
2179 | MKDEV(COMEDI_MAJOR, i), NULL, |
2180 | hardware_device, "comedi%i", i); | |
2181 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2182 | info->device->class_dev = csdev; |
883db3d9 FMH |
2183 | dev_set_drvdata(csdev, info); |
2184 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2185 | if (retval) { | |
0a85b6f0 | 2186 | printk(KERN_ERR |
21fe2eea M |
2187 | "comedi: " |
2188 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2189 | dev_attr_max_read_buffer_kb.attr.name); |
883db3d9 FMH |
2190 | comedi_free_board_minor(i); |
2191 | return retval; | |
2192 | } | |
2193 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2194 | if (retval) { | |
0a85b6f0 | 2195 | printk(KERN_ERR |
21fe2eea M |
2196 | "comedi: " |
2197 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2198 | dev_attr_read_buffer_kb.attr.name); |
883db3d9 FMH |
2199 | comedi_free_board_minor(i); |
2200 | return retval; | |
2201 | } | |
2202 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2203 | if (retval) { | |
0a85b6f0 | 2204 | printk(KERN_ERR |
21fe2eea M |
2205 | "comedi: " |
2206 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2207 | dev_attr_max_write_buffer_kb.attr.name); |
883db3d9 FMH |
2208 | comedi_free_board_minor(i); |
2209 | return retval; | |
2210 | } | |
2211 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2212 | if (retval) { | |
0a85b6f0 | 2213 | printk(KERN_ERR |
21fe2eea M |
2214 | "comedi: " |
2215 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2216 | dev_attr_write_buffer_kb.attr.name); |
883db3d9 FMH |
2217 | comedi_free_board_minor(i); |
2218 | return retval; | |
2219 | } | |
ed9eccbe DS |
2220 | return i; |
2221 | } | |
2222 | ||
2223 | void comedi_free_board_minor(unsigned minor) | |
2224 | { | |
2225 | unsigned long flags; | |
2226 | struct comedi_device_file_info *info; | |
2227 | ||
2228 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
5f74ea14 | 2229 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2230 | info = comedi_file_info_table[minor]; |
2231 | comedi_file_info_table[minor] = NULL; | |
5f74ea14 | 2232 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2233 | |
476b8477 | 2234 | if (info) { |
71b5f4f1 | 2235 | struct comedi_device *dev = info->device; |
476b8477 GKH |
2236 | if (dev) { |
2237 | if (dev->class_dev) { | |
2238 | device_destroy(comedi_class, | |
2239 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
ed9eccbe DS |
2240 | } |
2241 | comedi_device_cleanup(dev); | |
2242 | kfree(dev); | |
2243 | } | |
2244 | kfree(info); | |
2245 | } | |
2246 | } | |
2247 | ||
883db3d9 FMH |
2248 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
2249 | struct comedi_subdevice *s) | |
ed9eccbe DS |
2250 | { |
2251 | unsigned long flags; | |
2252 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2253 | struct device *csdev; |
ed9eccbe | 2254 | unsigned i; |
883db3d9 | 2255 | int retval; |
ed9eccbe DS |
2256 | |
2257 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2258 | if (info == NULL) |
2259 | return -ENOMEM; | |
ed9eccbe DS |
2260 | info->device = dev; |
2261 | info->read_subdevice = s; | |
2262 | info->write_subdevice = s; | |
5f74ea14 | 2263 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
4c41f3ae | 2264 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { |
476b8477 | 2265 | if (comedi_file_info_table[i] == NULL) { |
ed9eccbe DS |
2266 | comedi_file_info_table[i] = info; |
2267 | break; | |
2268 | } | |
2269 | } | |
5f74ea14 | 2270 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2271 | if (i == COMEDI_NUM_MINORS) { |
ed9eccbe | 2272 | kfree(info); |
0a85b6f0 | 2273 | printk(KERN_ERR |
21fe2eea M |
2274 | "comedi: error: " |
2275 | "ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2276 | return -EBUSY; |
2277 | } | |
2278 | s->minor = i; | |
2279 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, | |
476b8477 GKH |
2280 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
2281 | "comedi%i_subd%i", dev->minor, | |
2282 | (int)(s - dev->subdevices)); | |
2283 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2284 | s->class_dev = csdev; |
883db3d9 FMH |
2285 | dev_set_drvdata(csdev, info); |
2286 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2287 | if (retval) { | |
0a85b6f0 | 2288 | printk(KERN_ERR |
21fe2eea M |
2289 | "comedi: " |
2290 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2291 | dev_attr_max_read_buffer_kb.attr.name); |
883db3d9 FMH |
2292 | comedi_free_subdevice_minor(s); |
2293 | return retval; | |
2294 | } | |
2295 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2296 | if (retval) { | |
0a85b6f0 | 2297 | printk(KERN_ERR |
21fe2eea M |
2298 | "comedi: " |
2299 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2300 | dev_attr_read_buffer_kb.attr.name); |
883db3d9 FMH |
2301 | comedi_free_subdevice_minor(s); |
2302 | return retval; | |
2303 | } | |
2304 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2305 | if (retval) { | |
0a85b6f0 | 2306 | printk(KERN_ERR |
21fe2eea M |
2307 | "comedi: " |
2308 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2309 | dev_attr_max_write_buffer_kb.attr.name); |
883db3d9 FMH |
2310 | comedi_free_subdevice_minor(s); |
2311 | return retval; | |
2312 | } | |
2313 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2314 | if (retval) { | |
0a85b6f0 | 2315 | printk(KERN_ERR |
21fe2eea M |
2316 | "comedi: " |
2317 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2318 | dev_attr_write_buffer_kb.attr.name); |
883db3d9 FMH |
2319 | comedi_free_subdevice_minor(s); |
2320 | return retval; | |
2321 | } | |
ed9eccbe DS |
2322 | return i; |
2323 | } | |
2324 | ||
34c43922 | 2325 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
ed9eccbe DS |
2326 | { |
2327 | unsigned long flags; | |
2328 | struct comedi_device_file_info *info; | |
2329 | ||
476b8477 GKH |
2330 | if (s == NULL) |
2331 | return; | |
2332 | if (s->minor < 0) | |
2333 | return; | |
ed9eccbe DS |
2334 | |
2335 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); | |
2336 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
2337 | ||
5f74ea14 | 2338 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2339 | info = comedi_file_info_table[s->minor]; |
2340 | comedi_file_info_table[s->minor] = NULL; | |
5f74ea14 | 2341 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2342 | |
476b8477 | 2343 | if (s->class_dev) { |
ed9eccbe DS |
2344 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
2345 | s->class_dev = NULL; | |
2346 | } | |
2347 | kfree(info); | |
2348 | } | |
2349 | ||
2350 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) | |
2351 | { | |
2352 | unsigned long flags; | |
2353 | struct comedi_device_file_info *info; | |
2354 | ||
2355 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
5f74ea14 | 2356 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2357 | info = comedi_file_info_table[minor]; |
5f74ea14 | 2358 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2359 | return info; |
2360 | } | |
18736438 | 2361 | EXPORT_SYMBOL_GPL(comedi_get_device_file_info); |
883db3d9 FMH |
2362 | |
2363 | static int resize_async_buffer(struct comedi_device *dev, | |
2364 | struct comedi_subdevice *s, | |
2365 | struct comedi_async *async, unsigned new_size) | |
2366 | { | |
2367 | int retval; | |
2368 | ||
2369 | if (new_size > async->max_bufsize) | |
2370 | return -EPERM; | |
2371 | ||
2372 | if (s->busy) { | |
2373 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
2374 | return -EBUSY; | |
2375 | } | |
2376 | if (async->mmap_count) { | |
2377 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
2378 | return -EBUSY; | |
2379 | } | |
2380 | ||
2381 | if (!async->prealloc_buf) | |
2382 | return -EINVAL; | |
2383 | ||
2384 | /* make sure buffer is an integral number of pages | |
0a85b6f0 | 2385 | * (we round up) */ |
883db3d9 FMH |
2386 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
2387 | ||
2388 | retval = comedi_buf_alloc(dev, s, new_size); | |
2389 | if (retval < 0) | |
2390 | return retval; | |
2391 | ||
2392 | if (s->buf_change) { | |
2393 | retval = s->buf_change(dev, s, new_size); | |
2394 | if (retval < 0) | |
2395 | return retval; | |
2396 | } | |
2397 | ||
2398 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
b8b5cd9f | 2399 | dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); |
883db3d9 FMH |
2400 | return 0; |
2401 | } | |
2402 | ||
2403 | /* sysfs attribute files */ | |
2404 | ||
2405 | static const unsigned bytes_per_kibi = 1024; | |
2406 | ||
2407 | static ssize_t show_max_read_buffer_kb(struct device *dev, | |
2408 | struct device_attribute *attr, char *buf) | |
2409 | { | |
2410 | ssize_t retval; | |
2411 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2412 | unsigned max_buffer_size_kb = 0; | |
2413 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2414 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2415 | |
2416 | mutex_lock(&info->device->mutex); | |
2417 | if (read_subdevice && | |
2418 | (read_subdevice->subdev_flags & SDF_CMD_READ) && | |
2419 | read_subdevice->async) { | |
2420 | max_buffer_size_kb = read_subdevice->async->max_bufsize / | |
0a85b6f0 | 2421 | bytes_per_kibi; |
883db3d9 | 2422 | } |
0a85b6f0 | 2423 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2424 | mutex_unlock(&info->device->mutex); |
2425 | ||
2426 | return retval; | |
2427 | } | |
2428 | ||
2429 | static ssize_t store_max_read_buffer_kb(struct device *dev, | |
2430 | struct device_attribute *attr, | |
2431 | const char *buf, size_t count) | |
2432 | { | |
2433 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2434 | unsigned long new_max_size_kb; | |
2435 | uint64_t new_max_size; | |
2436 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2437 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2438 | |
2439 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2440 | return -EINVAL; | |
0a85b6f0 | 2441 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2442 | return -EINVAL; |
0a85b6f0 MT |
2443 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2444 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2445 | return -EINVAL; |
2446 | ||
2447 | mutex_lock(&info->device->mutex); | |
2448 | if (read_subdevice == NULL || | |
2449 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2450 | read_subdevice->async == NULL) { | |
2451 | mutex_unlock(&info->device->mutex); | |
2452 | return -EINVAL; | |
2453 | } | |
2454 | read_subdevice->async->max_bufsize = new_max_size; | |
2455 | mutex_unlock(&info->device->mutex); | |
2456 | ||
2457 | return count; | |
2458 | } | |
2459 | ||
2460 | static struct device_attribute dev_attr_max_read_buffer_kb = { | |
2461 | .attr = { | |
0a85b6f0 MT |
2462 | .name = "max_read_buffer_kb", |
2463 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2464 | .show = &show_max_read_buffer_kb, |
2465 | .store = &store_max_read_buffer_kb | |
2466 | }; | |
2467 | ||
2468 | static ssize_t show_read_buffer_kb(struct device *dev, | |
2469 | struct device_attribute *attr, char *buf) | |
2470 | { | |
2471 | ssize_t retval; | |
2472 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2473 | unsigned buffer_size_kb = 0; | |
2474 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2475 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2476 | |
2477 | mutex_lock(&info->device->mutex); | |
2478 | if (read_subdevice && | |
0a85b6f0 MT |
2479 | (read_subdevice->subdev_flags & SDF_CMD_READ) && |
2480 | read_subdevice->async) { | |
883db3d9 | 2481 | buffer_size_kb = read_subdevice->async->prealloc_bufsz / |
0a85b6f0 | 2482 | bytes_per_kibi; |
883db3d9 | 2483 | } |
0a85b6f0 | 2484 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2485 | mutex_unlock(&info->device->mutex); |
2486 | ||
2487 | return retval; | |
2488 | } | |
2489 | ||
2490 | static ssize_t store_read_buffer_kb(struct device *dev, | |
2491 | struct device_attribute *attr, | |
2492 | const char *buf, size_t count) | |
2493 | { | |
2494 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2495 | unsigned long new_size_kb; | |
2496 | uint64_t new_size; | |
2497 | int retval; | |
2498 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2499 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2500 | |
2501 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2502 | return -EINVAL; | |
0a85b6f0 | 2503 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2504 | return -EINVAL; |
0a85b6f0 MT |
2505 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2506 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2507 | return -EINVAL; |
2508 | ||
2509 | mutex_lock(&info->device->mutex); | |
2510 | if (read_subdevice == NULL || | |
2511 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2512 | read_subdevice->async == NULL) { | |
2513 | mutex_unlock(&info->device->mutex); | |
2514 | return -EINVAL; | |
2515 | } | |
2516 | retval = resize_async_buffer(info->device, read_subdevice, | |
2517 | read_subdevice->async, new_size); | |
2518 | mutex_unlock(&info->device->mutex); | |
2519 | ||
2520 | if (retval < 0) | |
2521 | return retval; | |
2522 | return count; | |
2523 | } | |
2524 | ||
2525 | static struct device_attribute dev_attr_read_buffer_kb = { | |
2526 | .attr = { | |
0a85b6f0 MT |
2527 | .name = "read_buffer_kb", |
2528 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2529 | .show = &show_read_buffer_kb, |
2530 | .store = &store_read_buffer_kb | |
2531 | }; | |
2532 | ||
2533 | static ssize_t show_max_write_buffer_kb(struct device *dev, | |
2534 | struct device_attribute *attr, | |
2535 | char *buf) | |
2536 | { | |
2537 | ssize_t retval; | |
2538 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2539 | unsigned max_buffer_size_kb = 0; | |
2540 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2541 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2542 | |
2543 | mutex_lock(&info->device->mutex); | |
2544 | if (write_subdevice && | |
2545 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2546 | write_subdevice->async) { | |
2547 | max_buffer_size_kb = write_subdevice->async->max_bufsize / | |
0a85b6f0 | 2548 | bytes_per_kibi; |
883db3d9 | 2549 | } |
0a85b6f0 | 2550 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2551 | mutex_unlock(&info->device->mutex); |
2552 | ||
2553 | return retval; | |
2554 | } | |
2555 | ||
2556 | static ssize_t store_max_write_buffer_kb(struct device *dev, | |
2557 | struct device_attribute *attr, | |
2558 | const char *buf, size_t count) | |
2559 | { | |
2560 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2561 | unsigned long new_max_size_kb; | |
2562 | uint64_t new_max_size; | |
2563 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2564 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2565 | |
2566 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2567 | return -EINVAL; | |
0a85b6f0 | 2568 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2569 | return -EINVAL; |
0a85b6f0 MT |
2570 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2571 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2572 | return -EINVAL; |
2573 | ||
2574 | mutex_lock(&info->device->mutex); | |
2575 | if (write_subdevice == NULL || | |
2576 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2577 | write_subdevice->async == NULL) { | |
2578 | mutex_unlock(&info->device->mutex); | |
2579 | return -EINVAL; | |
2580 | } | |
2581 | write_subdevice->async->max_bufsize = new_max_size; | |
2582 | mutex_unlock(&info->device->mutex); | |
2583 | ||
2584 | return count; | |
2585 | } | |
2586 | ||
2587 | static struct device_attribute dev_attr_max_write_buffer_kb = { | |
2588 | .attr = { | |
0a85b6f0 MT |
2589 | .name = "max_write_buffer_kb", |
2590 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2591 | .show = &show_max_write_buffer_kb, |
2592 | .store = &store_max_write_buffer_kb | |
2593 | }; | |
2594 | ||
2595 | static ssize_t show_write_buffer_kb(struct device *dev, | |
2596 | struct device_attribute *attr, char *buf) | |
2597 | { | |
2598 | ssize_t retval; | |
2599 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2600 | unsigned buffer_size_kb = 0; | |
2601 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2602 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2603 | |
2604 | mutex_lock(&info->device->mutex); | |
2605 | if (write_subdevice && | |
2606 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2607 | write_subdevice->async) { | |
2608 | buffer_size_kb = write_subdevice->async->prealloc_bufsz / | |
0a85b6f0 | 2609 | bytes_per_kibi; |
883db3d9 | 2610 | } |
0a85b6f0 | 2611 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2612 | mutex_unlock(&info->device->mutex); |
2613 | ||
2614 | return retval; | |
2615 | } | |
2616 | ||
2617 | static ssize_t store_write_buffer_kb(struct device *dev, | |
2618 | struct device_attribute *attr, | |
2619 | const char *buf, size_t count) | |
2620 | { | |
2621 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2622 | unsigned long new_size_kb; | |
2623 | uint64_t new_size; | |
2624 | int retval; | |
2625 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2626 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2627 | |
2628 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2629 | return -EINVAL; | |
0a85b6f0 | 2630 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2631 | return -EINVAL; |
0a85b6f0 MT |
2632 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2633 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2634 | return -EINVAL; |
2635 | ||
2636 | mutex_lock(&info->device->mutex); | |
2637 | if (write_subdevice == NULL || | |
2638 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2639 | write_subdevice->async == NULL) { | |
2640 | mutex_unlock(&info->device->mutex); | |
2641 | return -EINVAL; | |
2642 | } | |
2643 | retval = resize_async_buffer(info->device, write_subdevice, | |
0a85b6f0 | 2644 | write_subdevice->async, new_size); |
883db3d9 FMH |
2645 | mutex_unlock(&info->device->mutex); |
2646 | ||
2647 | if (retval < 0) | |
2648 | return retval; | |
2649 | return count; | |
2650 | } | |
2651 | ||
2652 | static struct device_attribute dev_attr_write_buffer_kb = { | |
2653 | .attr = { | |
0a85b6f0 MT |
2654 | .name = "write_buffer_kb", |
2655 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2656 | .show = &show_write_buffer_kb, |
2657 | .store = &store_write_buffer_kb | |
2658 | }; |