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Commit | Line | Data |
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ed9eccbe DS |
1 | /* |
2 | comedi/comedi_fops.c | |
3 | comedi kernel module | |
4 | ||
5 | COMEDI - Linux Control and Measurement Device Interface | |
6 | Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | */ | |
23 | ||
24 | #undef DEBUG | |
25 | ||
26 | #define __NO_VERSION__ | |
27 | #include "comedi_fops.h" | |
28 | #include "comedi_compat32.h" | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/kmod.h> | |
40 | #include <linux/poll.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/device.h> | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/fs.h> | |
45 | #include "comedidev.h" | |
46 | #include <linux/cdev.h> | |
883db3d9 | 47 | #include <linux/stat.h> |
ed9eccbe | 48 | |
476b8477 GKH |
49 | #include <linux/io.h> |
50 | #include <linux/uaccess.h> | |
ed9eccbe | 51 | |
242e7ad9 | 52 | #include "internal.h" |
ed9eccbe DS |
53 | |
54 | MODULE_AUTHOR("http://www.comedi.org"); | |
55 | MODULE_DESCRIPTION("Comedi core module"); | |
56 | MODULE_LICENSE("GPL"); | |
57 | ||
58 | #ifdef CONFIG_COMEDI_DEBUG | |
59 | int comedi_debug; | |
18736438 | 60 | EXPORT_SYMBOL(comedi_debug); |
ed9eccbe DS |
61 | module_param(comedi_debug, int, 0644); |
62 | #endif | |
63 | ||
6a9d7a21 IA |
64 | int comedi_autoconfig = 1; |
65 | module_param(comedi_autoconfig, bool, 0444); | |
66 | ||
92d0127c | 67 | static int comedi_num_legacy_minors; |
1dd33ab8 BP |
68 | module_param(comedi_num_legacy_minors, int, 0444); |
69 | ||
ed9eccbe | 70 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
476b8477 | 71 | static struct comedi_device_file_info |
0a85b6f0 | 72 | *comedi_file_info_table[COMEDI_NUM_MINORS]; |
476b8477 | 73 | |
0a85b6f0 | 74 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c GKH |
75 | struct comedi_devconfig __user *arg); |
76 | static int do_bufconfig_ioctl(struct comedi_device *dev, | |
77 | struct comedi_bufconfig __user *arg); | |
0a85b6f0 | 78 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
79 | struct comedi_devinfo __user *arg, |
80 | struct file *file); | |
0a85b6f0 | 81 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 82 | struct comedi_subdinfo __user *arg, void *file); |
0a85b6f0 | 83 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
84 | struct comedi_chaninfo __user *arg); |
85 | static int do_bufinfo_ioctl(struct comedi_device *dev, | |
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); |
ed9eccbe DS |
540 | put_user(x, it.rangelist + i); |
541 | } | |
476b8477 GKH |
542 | #if 0 |
543 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 544 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
545 | return -EFAULT; |
546 | #endif | |
ed9eccbe DS |
547 | } |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | /* | |
553 | COMEDI_BUFINFO | |
554 | buffer information ioctl | |
555 | ||
556 | arg: | |
557 | pointer to bufinfo structure | |
558 | ||
559 | reads: | |
560 | bufinfo at arg | |
561 | ||
562 | writes: | |
563 | modified bufinfo at arg | |
564 | ||
565 | */ | |
92d0127c | 566 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 567 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 568 | { |
9aa5339a | 569 | struct comedi_bufinfo bi; |
34c43922 | 570 | struct comedi_subdevice *s; |
d163679c | 571 | struct comedi_async *async; |
ed9eccbe | 572 | |
9aa5339a | 573 | if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
574 | return -EFAULT; |
575 | ||
576 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
577 | return -EINVAL; | |
578 | ||
579 | s = dev->subdevices + bi.subdevice; | |
53fa827e IA |
580 | |
581 | if (s->lock && s->lock != file) | |
582 | return -EACCES; | |
583 | ||
ed9eccbe DS |
584 | async = s->async; |
585 | ||
586 | if (!async) { | |
587 | DPRINTK("subdevice does not have async capability\n"); | |
588 | bi.buf_write_ptr = 0; | |
589 | bi.buf_read_ptr = 0; | |
590 | bi.buf_write_count = 0; | |
591 | bi.buf_read_count = 0; | |
4772c018 IA |
592 | bi.bytes_read = 0; |
593 | bi.bytes_written = 0; | |
ed9eccbe DS |
594 | goto copyback; |
595 | } | |
53fa827e IA |
596 | if (!s->busy) { |
597 | bi.bytes_read = 0; | |
598 | bi.bytes_written = 0; | |
599 | goto copyback_position; | |
600 | } | |
601 | if (s->busy != file) | |
602 | return -EACCES; | |
ed9eccbe DS |
603 | |
604 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
605 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
606 | comedi_buf_read_free(async, bi.bytes_read); | |
607 | ||
608 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | | |
476b8477 GKH |
609 | SRF_RUNNING)) |
610 | && async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
611 | do_become_nonbusy(dev, s); |
612 | } | |
613 | } | |
614 | ||
615 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
616 | bi.bytes_written = | |
476b8477 | 617 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
618 | comedi_buf_write_free(async, bi.bytes_written); |
619 | } | |
620 | ||
53fa827e | 621 | copyback_position: |
ed9eccbe DS |
622 | bi.buf_write_count = async->buf_write_count; |
623 | bi.buf_write_ptr = async->buf_write_ptr; | |
624 | bi.buf_read_count = async->buf_read_count; | |
625 | bi.buf_read_ptr = async->buf_read_ptr; | |
626 | ||
476b8477 | 627 | copyback: |
9aa5339a | 628 | if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
ed9eccbe DS |
629 | return -EFAULT; |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
0a85b6f0 MT |
634 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
635 | unsigned int *data, void *file); | |
ed9eccbe | 636 | /* |
20617f22 PDP |
637 | * COMEDI_INSNLIST |
638 | * synchronous instructions | |
ed9eccbe | 639 | * |
20617f22 PDP |
640 | * arg: |
641 | * pointer to sync cmd structure | |
ed9eccbe | 642 | * |
20617f22 PDP |
643 | * reads: |
644 | * sync cmd struct at arg | |
645 | * instruction list | |
646 | * data (for writes) | |
ed9eccbe | 647 | * |
20617f22 PDP |
648 | * writes: |
649 | * data (for reads) | |
ed9eccbe DS |
650 | */ |
651 | /* arbitrary limits */ | |
652 | #define MAX_SAMPLES 256 | |
92d0127c GKH |
653 | static int do_insnlist_ioctl(struct comedi_device *dev, |
654 | struct comedi_insnlist __user *arg, void *file) | |
ed9eccbe | 655 | { |
da613f4f | 656 | struct comedi_insnlist insnlist; |
90035c08 | 657 | struct comedi_insn *insns = NULL; |
790c5541 | 658 | unsigned int *data = NULL; |
ed9eccbe DS |
659 | int i = 0; |
660 | int ret = 0; | |
661 | ||
da613f4f | 662 | if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
ed9eccbe DS |
663 | return -EFAULT; |
664 | ||
790c5541 | 665 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
666 | if (!data) { |
667 | DPRINTK("kmalloc failed\n"); | |
668 | ret = -ENOMEM; | |
669 | goto error; | |
670 | } | |
671 | ||
0a85b6f0 MT |
672 | insns = |
673 | kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); | |
ed9eccbe DS |
674 | if (!insns) { |
675 | DPRINTK("kmalloc failed\n"); | |
676 | ret = -ENOMEM; | |
677 | goto error; | |
678 | } | |
679 | ||
680 | if (copy_from_user(insns, insnlist.insns, | |
90035c08 | 681 | sizeof(struct comedi_insn) * insnlist.n_insns)) { |
ed9eccbe DS |
682 | DPRINTK("copy_from_user failed\n"); |
683 | ret = -EFAULT; | |
684 | goto error; | |
685 | } | |
686 | ||
687 | for (i = 0; i < insnlist.n_insns; i++) { | |
688 | if (insns[i].n > MAX_SAMPLES) { | |
689 | DPRINTK("number of samples too large\n"); | |
690 | ret = -EINVAL; | |
691 | goto error; | |
692 | } | |
693 | if (insns[i].insn & INSN_MASK_WRITE) { | |
694 | if (copy_from_user(data, insns[i].data, | |
790c5541 | 695 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
696 | DPRINTK("copy_from_user failed\n"); |
697 | ret = -EFAULT; | |
698 | goto error; | |
699 | } | |
700 | } | |
701 | ret = parse_insn(dev, insns + i, data, file); | |
702 | if (ret < 0) | |
703 | goto error; | |
704 | if (insns[i].insn & INSN_MASK_READ) { | |
705 | if (copy_to_user(insns[i].data, data, | |
790c5541 | 706 | insns[i].n * sizeof(unsigned int))) { |
ed9eccbe DS |
707 | DPRINTK("copy_to_user failed\n"); |
708 | ret = -EFAULT; | |
709 | goto error; | |
710 | } | |
711 | } | |
712 | if (need_resched()) | |
713 | schedule(); | |
714 | } | |
715 | ||
476b8477 GKH |
716 | error: |
717 | kfree(insns); | |
718 | kfree(data); | |
ed9eccbe DS |
719 | |
720 | if (ret < 0) | |
721 | return ret; | |
722 | return i; | |
723 | } | |
724 | ||
0a85b6f0 MT |
725 | static int check_insn_config_length(struct comedi_insn *insn, |
726 | unsigned int *data) | |
ed9eccbe | 727 | { |
476b8477 GKH |
728 | if (insn->n < 1) |
729 | return -EINVAL; | |
ed9eccbe DS |
730 | |
731 | switch (data[0]) { | |
732 | case INSN_CONFIG_DIO_OUTPUT: | |
733 | case INSN_CONFIG_DIO_INPUT: | |
734 | case INSN_CONFIG_DISARM: | |
735 | case INSN_CONFIG_RESET: | |
736 | if (insn->n == 1) | |
737 | return 0; | |
738 | break; | |
739 | case INSN_CONFIG_ARM: | |
740 | case INSN_CONFIG_DIO_QUERY: | |
741 | case INSN_CONFIG_BLOCK_SIZE: | |
742 | case INSN_CONFIG_FILTER: | |
743 | case INSN_CONFIG_SERIAL_CLOCK: | |
744 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
745 | case INSN_CONFIG_ALT_SOURCE: | |
746 | case INSN_CONFIG_SET_COUNTER_MODE: | |
747 | case INSN_CONFIG_8254_READ_STATUS: | |
748 | case INSN_CONFIG_SET_ROUTING: | |
749 | case INSN_CONFIG_GET_ROUTING: | |
750 | case INSN_CONFIG_GET_PWM_STATUS: | |
751 | case INSN_CONFIG_PWM_SET_PERIOD: | |
752 | case INSN_CONFIG_PWM_GET_PERIOD: | |
753 | if (insn->n == 2) | |
754 | return 0; | |
755 | break; | |
756 | case INSN_CONFIG_SET_GATE_SRC: | |
757 | case INSN_CONFIG_GET_GATE_SRC: | |
758 | case INSN_CONFIG_SET_CLOCK_SRC: | |
759 | case INSN_CONFIG_GET_CLOCK_SRC: | |
760 | case INSN_CONFIG_SET_OTHER_SRC: | |
761 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
762 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
763 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
764 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
765 | if (insn->n == 3) | |
766 | return 0; | |
767 | break; | |
768 | case INSN_CONFIG_PWM_OUTPUT: | |
769 | case INSN_CONFIG_ANALOG_TRIG: | |
770 | if (insn->n == 5) | |
771 | return 0; | |
772 | break; | |
0a85b6f0 MT |
773 | /* by default we allow the insn since we don't have checks for |
774 | * all possible cases yet */ | |
ed9eccbe | 775 | default: |
3fffdf20 MR |
776 | printk(KERN_WARNING |
777 | "comedi: no check for data length of config insn id " | |
0a85b6f0 MT |
778 | "%i is implemented.\n" |
779 | " Add a check to %s in %s.\n" | |
780 | " Assuming n=%i is correct.\n", data[0], __func__, | |
781 | __FILE__, insn->n); | |
ed9eccbe DS |
782 | return 0; |
783 | break; | |
784 | } | |
785 | return -EINVAL; | |
786 | } | |
787 | ||
0a85b6f0 MT |
788 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
789 | unsigned int *data, void *file) | |
ed9eccbe | 790 | { |
34c43922 | 791 | struct comedi_subdevice *s; |
ed9eccbe DS |
792 | int ret = 0; |
793 | int i; | |
794 | ||
795 | if (insn->insn & INSN_MASK_SPECIAL) { | |
796 | /* a non-subdevice instruction */ | |
797 | ||
798 | switch (insn->insn) { | |
799 | case INSN_GTOD: | |
800 | { | |
801 | struct timeval tv; | |
802 | ||
803 | if (insn->n != 2) { | |
804 | ret = -EINVAL; | |
805 | break; | |
806 | } | |
807 | ||
808 | do_gettimeofday(&tv); | |
809 | data[0] = tv.tv_sec; | |
810 | data[1] = tv.tv_usec; | |
811 | ret = 2; | |
812 | ||
813 | break; | |
814 | } | |
815 | case INSN_WAIT: | |
816 | if (insn->n != 1 || data[0] >= 100000) { | |
817 | ret = -EINVAL; | |
818 | break; | |
819 | } | |
820 | udelay(data[0] / 1000); | |
821 | ret = 1; | |
822 | break; | |
823 | case INSN_INTTRIG: | |
824 | if (insn->n != 1) { | |
825 | ret = -EINVAL; | |
826 | break; | |
827 | } | |
828 | if (insn->subdev >= dev->n_subdevices) { | |
829 | DPRINTK("%d not usable subdevice\n", | |
830 | insn->subdev); | |
831 | ret = -EINVAL; | |
832 | break; | |
833 | } | |
834 | s = dev->subdevices + insn->subdev; | |
835 | if (!s->async) { | |
836 | DPRINTK("no async\n"); | |
837 | ret = -EINVAL; | |
838 | break; | |
839 | } | |
840 | if (!s->async->inttrig) { | |
841 | DPRINTK("no inttrig\n"); | |
842 | ret = -EAGAIN; | |
843 | break; | |
844 | } | |
845 | ret = s->async->inttrig(dev, s, insn->data[0]); | |
846 | if (ret >= 0) | |
847 | ret = 1; | |
848 | break; | |
849 | default: | |
850 | DPRINTK("invalid insn\n"); | |
851 | ret = -EINVAL; | |
852 | break; | |
853 | } | |
854 | } else { | |
855 | /* a subdevice instruction */ | |
790c5541 | 856 | unsigned int maxdata; |
ed9eccbe DS |
857 | |
858 | if (insn->subdev >= dev->n_subdevices) { | |
859 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
860 | ret = -EINVAL; | |
861 | goto out; | |
862 | } | |
863 | s = dev->subdevices + insn->subdev; | |
864 | ||
865 | if (s->type == COMEDI_SUBD_UNUSED) { | |
866 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
867 | ret = -EIO; | |
868 | goto out; | |
869 | } | |
870 | ||
871 | /* are we locked? (ioctl lock) */ | |
872 | if (s->lock && s->lock != file) { | |
873 | DPRINTK("device locked\n"); | |
874 | ret = -EACCES; | |
875 | goto out; | |
876 | } | |
877 | ||
0fd0ca75 | 878 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 879 | if (ret < 0) { |
ed9eccbe DS |
880 | ret = -EINVAL; |
881 | DPRINTK("bad chanspec\n"); | |
882 | goto out; | |
883 | } | |
884 | ||
885 | if (s->busy) { | |
886 | ret = -EBUSY; | |
887 | goto out; | |
888 | } | |
889 | /* This looks arbitrary. It is. */ | |
890 | s->busy = &parse_insn; | |
891 | switch (insn->insn) { | |
892 | case INSN_READ: | |
893 | ret = s->insn_read(dev, s, insn, data); | |
894 | break; | |
895 | case INSN_WRITE: | |
896 | maxdata = s->maxdata_list | |
476b8477 GKH |
897 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
898 | : s->maxdata; | |
ed9eccbe DS |
899 | for (i = 0; i < insn->n; ++i) { |
900 | if (data[i] > maxdata) { | |
901 | ret = -EINVAL; | |
902 | DPRINTK("bad data value(s)\n"); | |
903 | break; | |
904 | } | |
905 | } | |
906 | if (ret == 0) | |
907 | ret = s->insn_write(dev, s, insn, data); | |
908 | break; | |
909 | case INSN_BITS: | |
910 | if (insn->n != 2) { | |
911 | ret = -EINVAL; | |
912 | break; | |
913 | } | |
914 | ret = s->insn_bits(dev, s, insn, data); | |
915 | break; | |
916 | case INSN_CONFIG: | |
917 | ret = check_insn_config_length(insn, data); | |
918 | if (ret) | |
919 | break; | |
920 | ret = s->insn_config(dev, s, insn, data); | |
921 | break; | |
922 | default: | |
923 | ret = -EINVAL; | |
924 | break; | |
925 | } | |
926 | ||
927 | s->busy = NULL; | |
928 | } | |
929 | ||
476b8477 | 930 | out: |
ed9eccbe DS |
931 | return ret; |
932 | } | |
933 | ||
934 | /* | |
20617f22 PDP |
935 | * COMEDI_INSN |
936 | * synchronous instructions | |
ed9eccbe | 937 | * |
20617f22 PDP |
938 | * arg: |
939 | * pointer to insn | |
ed9eccbe | 940 | * |
20617f22 PDP |
941 | * reads: |
942 | * struct comedi_insn struct at arg | |
943 | * data (for writes) | |
ed9eccbe | 944 | * |
20617f22 PDP |
945 | * writes: |
946 | * data (for reads) | |
ed9eccbe | 947 | */ |
92d0127c GKH |
948 | static int do_insn_ioctl(struct comedi_device *dev, |
949 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 950 | { |
90035c08 | 951 | struct comedi_insn insn; |
790c5541 | 952 | unsigned int *data = NULL; |
ed9eccbe DS |
953 | int ret = 0; |
954 | ||
790c5541 | 955 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
956 | if (!data) { |
957 | ret = -ENOMEM; | |
958 | goto error; | |
959 | } | |
960 | ||
90035c08 | 961 | if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
ed9eccbe DS |
962 | ret = -EFAULT; |
963 | goto error; | |
964 | } | |
965 | ||
966 | /* This is where the behavior of insn and insnlist deviate. */ | |
967 | if (insn.n > MAX_SAMPLES) | |
968 | insn.n = MAX_SAMPLES; | |
969 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
970 | if (copy_from_user(data, |
971 | insn.data, | |
972 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
973 | ret = -EFAULT; |
974 | goto error; | |
975 | } | |
976 | } | |
977 | ret = parse_insn(dev, &insn, data, file); | |
978 | if (ret < 0) | |
979 | goto error; | |
980 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
981 | if (copy_to_user(insn.data, |
982 | data, | |
983 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
984 | ret = -EFAULT; |
985 | goto error; | |
986 | } | |
987 | } | |
988 | ret = insn.n; | |
989 | ||
476b8477 GKH |
990 | error: |
991 | kfree(data); | |
ed9eccbe DS |
992 | |
993 | return ret; | |
994 | } | |
995 | ||
181bd67b GKH |
996 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
997 | unsigned mask, unsigned bits) | |
998 | { | |
999 | unsigned long flags; | |
1000 | ||
1001 | spin_lock_irqsave(&s->spin_lock, flags); | |
1002 | s->runflags &= ~mask; | |
1003 | s->runflags |= (bits & mask); | |
1004 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
1005 | } | |
1006 | ||
92d0127c GKH |
1007 | static int do_cmd_ioctl(struct comedi_device *dev, |
1008 | struct comedi_cmd __user *cmd, void *file) | |
ed9eccbe | 1009 | { |
ea6d0d4c | 1010 | struct comedi_cmd user_cmd; |
34c43922 | 1011 | struct comedi_subdevice *s; |
d163679c | 1012 | struct comedi_async *async; |
ed9eccbe | 1013 | int ret = 0; |
92d0127c | 1014 | unsigned int __user *chanlist_saver = NULL; |
ed9eccbe | 1015 | |
92d0127c | 1016 | if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1017 | DPRINTK("bad cmd address\n"); |
1018 | return -EFAULT; | |
1019 | } | |
476b8477 | 1020 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1021 | chanlist_saver = user_cmd.chanlist; |
1022 | ||
1023 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1024 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1025 | return -ENODEV; | |
1026 | } | |
1027 | ||
1028 | s = dev->subdevices + user_cmd.subdev; | |
1029 | async = s->async; | |
1030 | ||
1031 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1032 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1033 | return -EIO; | |
1034 | } | |
1035 | ||
1036 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1037 | DPRINTK("subdevice %i does not support commands\n", | |
1038 | user_cmd.subdev); | |
1039 | return -EIO; | |
1040 | } | |
1041 | ||
1042 | /* are we locked? (ioctl lock) */ | |
1043 | if (s->lock && s->lock != file) { | |
1044 | DPRINTK("subdevice locked\n"); | |
1045 | return -EACCES; | |
1046 | } | |
1047 | ||
1048 | /* are we busy? */ | |
1049 | if (s->busy) { | |
1050 | DPRINTK("subdevice busy\n"); | |
1051 | return -EBUSY; | |
1052 | } | |
1053 | s->busy = file; | |
1054 | ||
1055 | /* make sure channel/gain list isn't too long */ | |
1056 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1057 | DPRINTK("channel/gain list too long %u > %d\n", | |
1058 | user_cmd.chanlist_len, s->len_chanlist); | |
1059 | ret = -EINVAL; | |
1060 | goto cleanup; | |
1061 | } | |
1062 | ||
1063 | /* make sure channel/gain list isn't too short */ | |
1064 | if (user_cmd.chanlist_len < 1) { | |
1065 | DPRINTK("channel/gain list too short %u < 1\n", | |
1066 | user_cmd.chanlist_len); | |
1067 | ret = -EINVAL; | |
1068 | goto cleanup; | |
1069 | } | |
1070 | ||
476b8477 | 1071 | kfree(async->cmd.chanlist); |
ed9eccbe DS |
1072 | async->cmd = user_cmd; |
1073 | async->cmd.data = NULL; | |
1074 | /* load channel/gain list */ | |
1075 | async->cmd.chanlist = | |
476b8477 | 1076 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1077 | if (!async->cmd.chanlist) { |
1078 | DPRINTK("allocation failed\n"); | |
1079 | ret = -ENOMEM; | |
1080 | goto cleanup; | |
1081 | } | |
1082 | ||
1083 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, | |
476b8477 | 1084 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1085 | DPRINTK("fault reading chanlist\n"); |
1086 | ret = -EFAULT; | |
1087 | goto cleanup; | |
1088 | } | |
1089 | ||
1090 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1091 | ret = comedi_check_chanlist(s, |
1092 | async->cmd.chanlist_len, | |
1093 | async->cmd.chanlist); | |
476b8477 | 1094 | if (ret < 0) { |
ed9eccbe DS |
1095 | DPRINTK("bad chanlist\n"); |
1096 | goto cleanup; | |
1097 | } | |
1098 | ||
1099 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1100 | ||
1101 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1102 | DPRINTK("test returned %d\n", ret); | |
1103 | user_cmd = async->cmd; | |
476b8477 | 1104 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1105 | user_cmd.chanlist = chanlist_saver; |
1106 | user_cmd.data = NULL; | |
92d0127c | 1107 | if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1108 | DPRINTK("fault writing cmd\n"); |
1109 | ret = -EFAULT; | |
1110 | goto cleanup; | |
1111 | } | |
1112 | ret = -EAGAIN; | |
1113 | goto cleanup; | |
1114 | } | |
1115 | ||
1116 | if (!async->prealloc_bufsz) { | |
1117 | ret = -ENOMEM; | |
1118 | DPRINTK("no buffer (?)\n"); | |
1119 | goto cleanup; | |
1120 | } | |
1121 | ||
1122 | comedi_reset_async_buf(async); | |
1123 | ||
1124 | async->cb_mask = | |
476b8477 GKH |
1125 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1126 | COMEDI_CB_OVERFLOW; | |
1127 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1128 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1129 | |
1130 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1131 | ||
ed9eccbe DS |
1132 | ret = s->do_cmd(dev, s); |
1133 | if (ret == 0) | |
1134 | return 0; | |
1135 | ||
476b8477 | 1136 | cleanup: |
ed9eccbe DS |
1137 | do_become_nonbusy(dev, s); |
1138 | ||
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | COMEDI_CMDTEST | |
1144 | command testing ioctl | |
1145 | ||
1146 | arg: | |
1147 | pointer to cmd structure | |
1148 | ||
1149 | reads: | |
1150 | cmd structure at arg | |
1151 | channel/range list | |
1152 | ||
1153 | writes: | |
1154 | modified cmd structure at arg | |
1155 | ||
1156 | */ | |
92d0127c GKH |
1157 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1158 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1159 | { |
ea6d0d4c | 1160 | struct comedi_cmd user_cmd; |
34c43922 | 1161 | struct comedi_subdevice *s; |
ed9eccbe DS |
1162 | int ret = 0; |
1163 | unsigned int *chanlist = NULL; | |
92d0127c | 1164 | unsigned int __user *chanlist_saver = NULL; |
ed9eccbe | 1165 | |
ea6d0d4c | 1166 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1167 | DPRINTK("bad cmd address\n"); |
1168 | return -EFAULT; | |
1169 | } | |
476b8477 | 1170 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1171 | chanlist_saver = user_cmd.chanlist; |
1172 | ||
1173 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1174 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1175 | return -ENODEV; | |
1176 | } | |
1177 | ||
1178 | s = dev->subdevices + user_cmd.subdev; | |
1179 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1180 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1181 | return -EIO; | |
1182 | } | |
1183 | ||
1184 | if (!s->do_cmd || !s->do_cmdtest) { | |
1185 | DPRINTK("subdevice %i does not support commands\n", | |
1186 | user_cmd.subdev); | |
1187 | return -EIO; | |
1188 | } | |
1189 | ||
1190 | /* make sure channel/gain list isn't too long */ | |
1191 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1192 | DPRINTK("channel/gain list too long %d > %d\n", | |
1193 | user_cmd.chanlist_len, s->len_chanlist); | |
1194 | ret = -EINVAL; | |
1195 | goto cleanup; | |
1196 | } | |
1197 | ||
1198 | /* load channel/gain list */ | |
1199 | if (user_cmd.chanlist) { | |
1200 | chanlist = | |
476b8477 | 1201 | kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1202 | if (!chanlist) { |
1203 | DPRINTK("allocation failed\n"); | |
1204 | ret = -ENOMEM; | |
1205 | goto cleanup; | |
1206 | } | |
1207 | ||
1208 | if (copy_from_user(chanlist, user_cmd.chanlist, | |
476b8477 | 1209 | user_cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1210 | DPRINTK("fault reading chanlist\n"); |
1211 | ret = -EFAULT; | |
1212 | goto cleanup; | |
1213 | } | |
1214 | ||
1215 | /* make sure each element in channel/gain list is valid */ | |
0fd0ca75 | 1216 | ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); |
476b8477 | 1217 | if (ret < 0) { |
ed9eccbe DS |
1218 | DPRINTK("bad chanlist\n"); |
1219 | goto cleanup; | |
1220 | } | |
1221 | ||
1222 | user_cmd.chanlist = chanlist; | |
1223 | } | |
1224 | ||
1225 | ret = s->do_cmdtest(dev, s, &user_cmd); | |
1226 | ||
476b8477 | 1227 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1228 | user_cmd.chanlist = chanlist_saver; |
1229 | ||
ea6d0d4c | 1230 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
ed9eccbe DS |
1231 | DPRINTK("bad cmd address\n"); |
1232 | ret = -EFAULT; | |
1233 | goto cleanup; | |
1234 | } | |
476b8477 GKH |
1235 | cleanup: |
1236 | kfree(chanlist); | |
ed9eccbe DS |
1237 | |
1238 | return ret; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | COMEDI_LOCK | |
1243 | lock subdevice | |
1244 | ||
1245 | arg: | |
1246 | subdevice number | |
1247 | ||
1248 | reads: | |
1249 | none | |
1250 | ||
1251 | writes: | |
1252 | none | |
1253 | ||
1254 | */ | |
1255 | ||
0a85b6f0 MT |
1256 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1257 | void *file) | |
ed9eccbe DS |
1258 | { |
1259 | int ret = 0; | |
1260 | unsigned long flags; | |
34c43922 | 1261 | struct comedi_subdevice *s; |
ed9eccbe DS |
1262 | |
1263 | if (arg >= dev->n_subdevices) | |
1264 | return -EINVAL; | |
1265 | s = dev->subdevices + arg; | |
1266 | ||
5f74ea14 | 1267 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1268 | if (s->busy || s->lock) |
ed9eccbe | 1269 | ret = -EBUSY; |
476b8477 | 1270 | else |
ed9eccbe | 1271 | s->lock = file; |
5f74ea14 | 1272 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
1273 | |
1274 | if (ret < 0) | |
1275 | return ret; | |
1276 | ||
1277 | #if 0 | |
1278 | if (s->lock_f) | |
1279 | ret = s->lock_f(dev, s); | |
1280 | #endif | |
1281 | ||
1282 | return ret; | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | COMEDI_UNLOCK | |
1287 | unlock subdevice | |
1288 | ||
1289 | arg: | |
1290 | subdevice number | |
1291 | ||
1292 | reads: | |
1293 | none | |
1294 | ||
1295 | writes: | |
1296 | none | |
1297 | ||
1298 | This function isn't protected by the semaphore, since | |
1299 | we already own the lock. | |
1300 | */ | |
0a85b6f0 MT |
1301 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1302 | void *file) | |
ed9eccbe | 1303 | { |
34c43922 | 1304 | struct comedi_subdevice *s; |
ed9eccbe DS |
1305 | |
1306 | if (arg >= dev->n_subdevices) | |
1307 | return -EINVAL; | |
1308 | s = dev->subdevices + arg; | |
1309 | ||
1310 | if (s->busy) | |
1311 | return -EBUSY; | |
1312 | ||
1313 | if (s->lock && s->lock != file) | |
1314 | return -EACCES; | |
1315 | ||
1316 | if (s->lock == file) { | |
1317 | #if 0 | |
1318 | if (s->unlock) | |
1319 | s->unlock(dev, s); | |
1320 | #endif | |
1321 | ||
1322 | s->lock = NULL; | |
1323 | } | |
1324 | ||
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | COMEDI_CANCEL | |
1330 | cancel acquisition ioctl | |
1331 | ||
1332 | arg: | |
1333 | subdevice number | |
1334 | ||
1335 | reads: | |
1336 | nothing | |
1337 | ||
1338 | writes: | |
1339 | nothing | |
1340 | ||
1341 | */ | |
0a85b6f0 MT |
1342 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1343 | void *file) | |
ed9eccbe | 1344 | { |
34c43922 | 1345 | struct comedi_subdevice *s; |
ed9eccbe DS |
1346 | |
1347 | if (arg >= dev->n_subdevices) | |
1348 | return -EINVAL; | |
1349 | s = dev->subdevices + arg; | |
1350 | if (s->async == NULL) | |
1351 | return -EINVAL; | |
1352 | ||
1353 | if (s->lock && s->lock != file) | |
1354 | return -EACCES; | |
1355 | ||
1356 | if (!s->busy) | |
1357 | return 0; | |
1358 | ||
1359 | if (s->busy != file) | |
1360 | return -EBUSY; | |
1361 | ||
1362 | return do_cancel(dev, s); | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | COMEDI_POLL ioctl | |
1367 | instructs driver to synchronize buffers | |
1368 | ||
1369 | arg: | |
1370 | subdevice number | |
1371 | ||
1372 | reads: | |
1373 | nothing | |
1374 | ||
1375 | writes: | |
1376 | nothing | |
1377 | ||
1378 | */ | |
0a85b6f0 MT |
1379 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1380 | void *file) | |
ed9eccbe | 1381 | { |
34c43922 | 1382 | struct comedi_subdevice *s; |
ed9eccbe DS |
1383 | |
1384 | if (arg >= dev->n_subdevices) | |
1385 | return -EINVAL; | |
1386 | s = dev->subdevices + arg; | |
1387 | ||
1388 | if (s->lock && s->lock != file) | |
1389 | return -EACCES; | |
1390 | ||
1391 | if (!s->busy) | |
1392 | return 0; | |
1393 | ||
1394 | if (s->busy != file) | |
1395 | return -EBUSY; | |
1396 | ||
1397 | if (s->poll) | |
1398 | return s->poll(dev, s); | |
1399 | ||
1400 | return -EINVAL; | |
1401 | } | |
1402 | ||
34c43922 | 1403 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
1404 | { |
1405 | int ret = 0; | |
1406 | ||
1407 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) | |
1408 | ret = s->cancel(dev, s); | |
1409 | ||
1410 | do_become_nonbusy(dev, s); | |
1411 | ||
1412 | return ret; | |
1413 | } | |
1414 | ||
92d0127c | 1415 | static void comedi_unmap(struct vm_area_struct *area) |
ed9eccbe | 1416 | { |
d163679c | 1417 | struct comedi_async *async; |
71b5f4f1 | 1418 | struct comedi_device *dev; |
ed9eccbe DS |
1419 | |
1420 | async = area->vm_private_data; | |
1421 | dev = async->subdevice->device; | |
1422 | ||
1423 | mutex_lock(&dev->mutex); | |
1424 | async->mmap_count--; | |
1425 | mutex_unlock(&dev->mutex); | |
1426 | } | |
1427 | ||
1428 | static struct vm_operations_struct comedi_vm_ops = { | |
0a85b6f0 | 1429 | .close = comedi_unmap, |
ed9eccbe DS |
1430 | }; |
1431 | ||
1432 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1433 | { | |
1434 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1435 | struct comedi_device_file_info *dev_file_info = |
1436 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1437 | struct comedi_device *dev = dev_file_info->device; |
d163679c | 1438 | struct comedi_async *async = NULL; |
ed9eccbe DS |
1439 | unsigned long start = vma->vm_start; |
1440 | unsigned long size; | |
1441 | int n_pages; | |
1442 | int i; | |
1443 | int retval; | |
34c43922 | 1444 | struct comedi_subdevice *s; |
ed9eccbe DS |
1445 | |
1446 | mutex_lock(&dev->mutex); | |
1447 | if (!dev->attached) { | |
1448 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1449 | retval = -ENODEV; | |
1450 | goto done; | |
1451 | } | |
476b8477 | 1452 | if (vma->vm_flags & VM_WRITE) |
ed9eccbe | 1453 | s = comedi_get_write_subdevice(dev_file_info); |
476b8477 | 1454 | else |
ed9eccbe | 1455 | s = comedi_get_read_subdevice(dev_file_info); |
476b8477 | 1456 | |
ed9eccbe DS |
1457 | if (s == NULL) { |
1458 | retval = -EINVAL; | |
1459 | goto done; | |
1460 | } | |
1461 | async = s->async; | |
1462 | if (async == NULL) { | |
1463 | retval = -EINVAL; | |
1464 | goto done; | |
1465 | } | |
1466 | ||
1467 | if (vma->vm_pgoff != 0) { | |
1468 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1469 | retval = -EINVAL; | |
1470 | goto done; | |
1471 | } | |
1472 | ||
1473 | size = vma->vm_end - vma->vm_start; | |
1474 | if (size > async->prealloc_bufsz) { | |
1475 | retval = -EFAULT; | |
1476 | goto done; | |
1477 | } | |
1478 | if (size & (~PAGE_MASK)) { | |
1479 | retval = -EFAULT; | |
1480 | goto done; | |
1481 | } | |
1482 | ||
1483 | n_pages = size >> PAGE_SHIFT; | |
1484 | for (i = 0; i < n_pages; ++i) { | |
1485 | if (remap_pfn_range(vma, start, | |
0a85b6f0 MT |
1486 | page_to_pfn(virt_to_page |
1487 | (async->buf_page_list | |
1488 | [i].virt_addr)), PAGE_SIZE, | |
1489 | PAGE_SHARED)) { | |
ed9eccbe DS |
1490 | retval = -EAGAIN; |
1491 | goto done; | |
1492 | } | |
1493 | start += PAGE_SIZE; | |
1494 | } | |
1495 | ||
1496 | vma->vm_ops = &comedi_vm_ops; | |
1497 | vma->vm_private_data = async; | |
1498 | ||
1499 | async->mmap_count++; | |
1500 | ||
1501 | retval = 0; | |
476b8477 | 1502 | done: |
ed9eccbe DS |
1503 | mutex_unlock(&dev->mutex); |
1504 | return retval; | |
1505 | } | |
1506 | ||
0a85b6f0 | 1507 | static unsigned int comedi_poll(struct file *file, poll_table * wait) |
ed9eccbe DS |
1508 | { |
1509 | unsigned int mask = 0; | |
1510 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1511 | struct comedi_device_file_info *dev_file_info = |
1512 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1513 | struct comedi_device *dev = dev_file_info->device; |
34c43922 BP |
1514 | struct comedi_subdevice *read_subdev; |
1515 | struct comedi_subdevice *write_subdev; | |
ed9eccbe DS |
1516 | |
1517 | mutex_lock(&dev->mutex); | |
1518 | if (!dev->attached) { | |
1519 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1520 | mutex_unlock(&dev->mutex); | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | mask = 0; | |
1525 | read_subdev = comedi_get_read_subdevice(dev_file_info); | |
1526 | if (read_subdev) { | |
1527 | poll_wait(file, &read_subdev->async->wait_head, wait); | |
1528 | if (!read_subdev->busy | |
476b8477 GKH |
1529 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
1530 | || !(comedi_get_subdevice_runflags(read_subdev) & | |
1531 | SRF_RUNNING)) { | |
ed9eccbe DS |
1532 | mask |= POLLIN | POLLRDNORM; |
1533 | } | |
1534 | } | |
1535 | write_subdev = comedi_get_write_subdevice(dev_file_info); | |
1536 | if (write_subdev) { | |
1537 | poll_wait(file, &write_subdev->async->wait_head, wait); | |
476b8477 GKH |
1538 | comedi_buf_write_alloc(write_subdev->async, |
1539 | write_subdev->async->prealloc_bufsz); | |
ed9eccbe | 1540 | if (!write_subdev->busy |
476b8477 GKH |
1541 | || !(comedi_get_subdevice_runflags(write_subdev) & |
1542 | SRF_RUNNING) | |
1543 | || comedi_buf_write_n_allocated(write_subdev->async) >= | |
1544 | bytes_per_sample(write_subdev->async->subdevice)) { | |
ed9eccbe DS |
1545 | mask |= POLLOUT | POLLWRNORM; |
1546 | } | |
1547 | } | |
1548 | ||
1549 | mutex_unlock(&dev->mutex); | |
1550 | return mask; | |
1551 | } | |
1552 | ||
92d0127c GKH |
1553 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
1554 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 1555 | { |
34c43922 | 1556 | struct comedi_subdevice *s; |
d163679c | 1557 | struct comedi_async *async; |
ed9eccbe DS |
1558 | int n, m, count = 0, retval = 0; |
1559 | DECLARE_WAITQUEUE(wait, current); | |
1560 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1561 | struct comedi_device_file_info *dev_file_info = |
1562 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1563 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1564 | |
1565 | if (!dev->attached) { | |
1566 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1567 | retval = -ENODEV; | |
1568 | goto done; | |
1569 | } | |
1570 | ||
1571 | s = comedi_get_write_subdevice(dev_file_info); | |
1572 | if (s == NULL) { | |
1573 | retval = -EIO; | |
1574 | goto done; | |
1575 | } | |
1576 | async = s->async; | |
1577 | ||
1578 | if (!nbytes) { | |
1579 | retval = 0; | |
1580 | goto done; | |
1581 | } | |
1582 | if (!s->busy) { | |
1583 | retval = 0; | |
1584 | goto done; | |
1585 | } | |
1586 | if (s->busy != file) { | |
1587 | retval = -EACCES; | |
1588 | goto done; | |
1589 | } | |
1590 | add_wait_queue(&async->wait_head, &wait); | |
1591 | while (nbytes > 0 && !retval) { | |
1592 | set_current_state(TASK_INTERRUPTIBLE); | |
1593 | ||
d2611540 IA |
1594 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
1595 | if (count == 0) { | |
1596 | if (comedi_get_subdevice_runflags(s) & | |
1597 | SRF_ERROR) { | |
1598 | retval = -EPIPE; | |
1599 | } else { | |
1600 | retval = 0; | |
1601 | } | |
1602 | do_become_nonbusy(dev, s); | |
1603 | } | |
1604 | break; | |
1605 | } | |
1606 | ||
ed9eccbe DS |
1607 | n = nbytes; |
1608 | ||
1609 | m = n; | |
476b8477 | 1610 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1611 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1612 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1613 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1614 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1615 | if (m < n) |
1616 | n = m; | |
1617 | ||
1618 | if (n == 0) { | |
ed9eccbe DS |
1619 | if (file->f_flags & O_NONBLOCK) { |
1620 | retval = -EAGAIN; | |
1621 | break; | |
1622 | } | |
1623 | if (signal_pending(current)) { | |
1624 | retval = -ERESTARTSYS; | |
1625 | break; | |
1626 | } | |
1627 | schedule(); | |
476b8477 | 1628 | if (!s->busy) |
ed9eccbe | 1629 | break; |
ed9eccbe DS |
1630 | if (s->busy != file) { |
1631 | retval = -EACCES; | |
1632 | break; | |
1633 | } | |
1634 | continue; | |
1635 | } | |
1636 | ||
1637 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1638 | buf, n); |
ed9eccbe DS |
1639 | if (m) { |
1640 | n -= m; | |
1641 | retval = -EFAULT; | |
1642 | } | |
1643 | comedi_buf_write_free(async, n); | |
1644 | ||
1645 | count += n; | |
1646 | nbytes -= n; | |
1647 | ||
1648 | buf += n; | |
1649 | break; /* makes device work like a pipe */ | |
1650 | } | |
1651 | set_current_state(TASK_RUNNING); | |
1652 | remove_wait_queue(&async->wait_head, &wait); | |
1653 | ||
1654 | done: | |
476b8477 | 1655 | return count ? count : retval; |
ed9eccbe DS |
1656 | } |
1657 | ||
92d0127c | 1658 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 1659 | loff_t *offset) |
ed9eccbe | 1660 | { |
34c43922 | 1661 | struct comedi_subdevice *s; |
d163679c | 1662 | struct comedi_async *async; |
ed9eccbe DS |
1663 | int n, m, count = 0, retval = 0; |
1664 | DECLARE_WAITQUEUE(wait, current); | |
1665 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1666 | struct comedi_device_file_info *dev_file_info = |
1667 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1668 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1669 | |
1670 | if (!dev->attached) { | |
1671 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1672 | retval = -ENODEV; | |
1673 | goto done; | |
1674 | } | |
1675 | ||
1676 | s = comedi_get_read_subdevice(dev_file_info); | |
1677 | if (s == NULL) { | |
1678 | retval = -EIO; | |
1679 | goto done; | |
1680 | } | |
1681 | async = s->async; | |
1682 | if (!nbytes) { | |
1683 | retval = 0; | |
1684 | goto done; | |
1685 | } | |
1686 | if (!s->busy) { | |
1687 | retval = 0; | |
1688 | goto done; | |
1689 | } | |
1690 | if (s->busy != file) { | |
1691 | retval = -EACCES; | |
1692 | goto done; | |
1693 | } | |
1694 | ||
1695 | add_wait_queue(&async->wait_head, &wait); | |
1696 | while (nbytes > 0 && !retval) { | |
1697 | set_current_state(TASK_INTERRUPTIBLE); | |
1698 | ||
1699 | n = nbytes; | |
1700 | ||
1701 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
1702 | /* printk("%d available\n",m); */ |
1703 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 1704 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 1705 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
1706 | if (m < n) |
1707 | n = m; | |
1708 | ||
1709 | if (n == 0) { | |
1710 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1711 | do_become_nonbusy(dev, s); | |
1712 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1713 | SRF_ERROR) { |
ed9eccbe DS |
1714 | retval = -EPIPE; |
1715 | } else { | |
1716 | retval = 0; | |
1717 | } | |
1718 | break; | |
1719 | } | |
1720 | if (file->f_flags & O_NONBLOCK) { | |
1721 | retval = -EAGAIN; | |
1722 | break; | |
1723 | } | |
1724 | if (signal_pending(current)) { | |
1725 | retval = -ERESTARTSYS; | |
1726 | break; | |
1727 | } | |
1728 | schedule(); | |
1729 | if (!s->busy) { | |
1730 | retval = 0; | |
1731 | break; | |
1732 | } | |
1733 | if (s->busy != file) { | |
1734 | retval = -EACCES; | |
1735 | break; | |
1736 | } | |
1737 | continue; | |
1738 | } | |
1739 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 1740 | async->buf_read_ptr, n); |
ed9eccbe DS |
1741 | if (m) { |
1742 | n -= m; | |
1743 | retval = -EFAULT; | |
1744 | } | |
1745 | ||
1746 | comedi_buf_read_alloc(async, n); | |
1747 | comedi_buf_read_free(async, n); | |
1748 | ||
1749 | count += n; | |
1750 | nbytes -= n; | |
1751 | ||
1752 | buf += n; | |
1753 | break; /* makes device work like a pipe */ | |
1754 | } | |
1755 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && | |
476b8477 | 1756 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
1757 | do_become_nonbusy(dev, s); |
1758 | } | |
1759 | set_current_state(TASK_RUNNING); | |
1760 | remove_wait_queue(&async->wait_head, &wait); | |
1761 | ||
1762 | done: | |
476b8477 | 1763 | return count ? count : retval; |
ed9eccbe DS |
1764 | } |
1765 | ||
1766 | /* | |
1767 | This function restores a subdevice to an idle state. | |
1768 | */ | |
34c43922 | 1769 | void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 1770 | { |
d163679c | 1771 | struct comedi_async *async = s->async; |
ed9eccbe DS |
1772 | |
1773 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
ed9eccbe DS |
1774 | if (async) { |
1775 | comedi_reset_async_buf(async); | |
1776 | async->inttrig = NULL; | |
1777 | } else { | |
476b8477 GKH |
1778 | printk(KERN_ERR |
1779 | "BUG: (?) do_become_nonbusy called with async=0\n"); | |
ed9eccbe DS |
1780 | } |
1781 | ||
1782 | s->busy = NULL; | |
1783 | } | |
1784 | ||
1785 | static int comedi_open(struct inode *inode, struct file *file) | |
1786 | { | |
ed9eccbe | 1787 | const unsigned minor = iminor(inode); |
476b8477 GKH |
1788 | struct comedi_device_file_info *dev_file_info = |
1789 | comedi_get_device_file_info(minor); | |
0a85b6f0 MT |
1790 | struct comedi_device *dev = |
1791 | dev_file_info ? dev_file_info->device : NULL; | |
97920071 | 1792 | |
ed9eccbe DS |
1793 | if (dev == NULL) { |
1794 | DPRINTK("invalid minor number\n"); | |
1795 | return -ENODEV; | |
1796 | } | |
1797 | ||
1798 | /* This is slightly hacky, but we want module autoloading | |
1799 | * to work for root. | |
1800 | * case: user opens device, attached -> ok | |
1801 | * case: user opens device, unattached, in_request_module=0 -> autoload | |
1802 | * case: user opens device, unattached, in_request_module=1 -> fail | |
1803 | * case: root opens device, attached -> ok | |
1804 | * case: root opens device, unattached, in_request_module=1 -> ok | |
1805 | * (typically called from modprobe) | |
1806 | * case: root opens device, unattached, in_request_module=0 -> autoload | |
1807 | * | |
1808 | * The last could be changed to "-> ok", which would deny root | |
1809 | * autoloading. | |
1810 | */ | |
1811 | mutex_lock(&dev->mutex); | |
1812 | if (dev->attached) | |
1813 | goto ok; | |
a8f80e8f | 1814 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
1815 | DPRINTK("in request module\n"); |
1816 | mutex_unlock(&dev->mutex); | |
1817 | return -ENODEV; | |
1818 | } | |
a8f80e8f | 1819 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
1820 | goto ok; |
1821 | ||
1822 | dev->in_request_module = 1; | |
1823 | ||
ed9eccbe DS |
1824 | #ifdef CONFIG_KMOD |
1825 | mutex_unlock(&dev->mutex); | |
56d92c60 | 1826 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
1827 | mutex_lock(&dev->mutex); |
1828 | #endif | |
1829 | ||
1830 | dev->in_request_module = 0; | |
1831 | ||
a8f80e8f EP |
1832 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
1833 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
1834 | mutex_unlock(&dev->mutex); |
1835 | return -ENODEV; | |
1836 | } | |
1837 | ok: | |
1838 | __module_get(THIS_MODULE); | |
1839 | ||
1840 | if (dev->attached) { | |
1841 | if (!try_module_get(dev->driver->module)) { | |
1842 | module_put(THIS_MODULE); | |
1843 | mutex_unlock(&dev->mutex); | |
1844 | return -ENOSYS; | |
1845 | } | |
1846 | } | |
1847 | ||
3c17ba07 IA |
1848 | if (dev->attached && dev->use_count == 0 && dev->open) { |
1849 | int rc = dev->open(dev); | |
1850 | if (rc < 0) { | |
1851 | module_put(dev->driver->module); | |
1852 | module_put(THIS_MODULE); | |
1853 | mutex_unlock(&dev->mutex); | |
1854 | return rc; | |
1855 | } | |
1856 | } | |
ed9eccbe DS |
1857 | |
1858 | dev->use_count++; | |
1859 | ||
1860 | mutex_unlock(&dev->mutex); | |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | static int comedi_close(struct inode *inode, struct file *file) | |
1866 | { | |
1867 | const unsigned minor = iminor(inode); | |
476b8477 GKH |
1868 | struct comedi_device_file_info *dev_file_info = |
1869 | comedi_get_device_file_info(minor); | |
71b5f4f1 | 1870 | struct comedi_device *dev = dev_file_info->device; |
34c43922 | 1871 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
1872 | int i; |
1873 | ||
1874 | mutex_lock(&dev->mutex); | |
1875 | ||
1876 | if (dev->subdevices) { | |
1877 | for (i = 0; i < dev->n_subdevices; i++) { | |
1878 | s = dev->subdevices + i; | |
1879 | ||
476b8477 | 1880 | if (s->busy == file) |
ed9eccbe | 1881 | do_cancel(dev, s); |
476b8477 | 1882 | if (s->lock == file) |
ed9eccbe | 1883 | s->lock = NULL; |
ed9eccbe DS |
1884 | } |
1885 | } | |
476b8477 | 1886 | if (dev->attached && dev->use_count == 1 && dev->close) |
ed9eccbe | 1887 | dev->close(dev); |
ed9eccbe DS |
1888 | |
1889 | module_put(THIS_MODULE); | |
476b8477 | 1890 | if (dev->attached) |
ed9eccbe | 1891 | module_put(dev->driver->module); |
ed9eccbe DS |
1892 | |
1893 | dev->use_count--; | |
1894 | ||
1895 | mutex_unlock(&dev->mutex); | |
1896 | ||
476b8477 | 1897 | if (file->f_flags & FASYNC) |
ed9eccbe | 1898 | comedi_fasync(-1, file, 0); |
ed9eccbe DS |
1899 | |
1900 | return 0; | |
1901 | } | |
1902 | ||
1903 | static int comedi_fasync(int fd, struct file *file, int on) | |
1904 | { | |
1905 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1906 | struct comedi_device_file_info *dev_file_info = |
1907 | comedi_get_device_file_info(minor); | |
1908 | ||
71b5f4f1 | 1909 | struct comedi_device *dev = dev_file_info->device; |
ed9eccbe DS |
1910 | |
1911 | return fasync_helper(fd, file, on, &dev->async_queue); | |
1912 | } | |
1913 | ||
1914 | const struct file_operations comedi_fops = { | |
0a85b6f0 | 1915 | .owner = THIS_MODULE, |
0a85b6f0 | 1916 | .unlocked_ioctl = comedi_unlocked_ioctl, |
0a85b6f0 | 1917 | .compat_ioctl = comedi_compat_ioctl, |
0a85b6f0 MT |
1918 | .open = comedi_open, |
1919 | .release = comedi_close, | |
1920 | .read = comedi_read, | |
1921 | .write = comedi_write, | |
1922 | .mmap = comedi_mmap, | |
1923 | .poll = comedi_poll, | |
1924 | .fasync = comedi_fasync, | |
6038f373 | 1925 | .llseek = noop_llseek, |
ed9eccbe DS |
1926 | }; |
1927 | ||
476b8477 | 1928 | struct class *comedi_class; |
ed9eccbe DS |
1929 | static struct cdev comedi_cdev; |
1930 | ||
1931 | static void comedi_cleanup_legacy_minors(void) | |
1932 | { | |
1933 | unsigned i; | |
476b8477 | 1934 | |
1dd33ab8 | 1935 | for (i = 0; i < comedi_num_legacy_minors; i++) |
ed9eccbe | 1936 | comedi_free_board_minor(i); |
ed9eccbe DS |
1937 | } |
1938 | ||
1939 | static int __init comedi_init(void) | |
1940 | { | |
1941 | int i; | |
1942 | int retval; | |
1943 | ||
476b8477 GKH |
1944 | printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
1945 | " - http://www.comedi.org\n"); | |
ed9eccbe | 1946 | |
a3cb729e FMH |
1947 | if (comedi_num_legacy_minors < 0 || |
1948 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
1949 | printk(KERN_ERR "comedi: error: invalid value for module " | |
1950 | "parameter \"comedi_num_legacy_minors\". Valid values " | |
1951 | "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); | |
1952 | return -EINVAL; | |
1953 | } | |
1954 | ||
1955 | /* | |
1956 | * comedi is unusable if both comedi_autoconfig and | |
1957 | * comedi_num_legacy_minors are zero, so we might as well adjust the | |
1958 | * defaults in that case | |
1959 | */ | |
1960 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) | |
1961 | comedi_num_legacy_minors = 16; | |
1962 | ||
476b8477 GKH |
1963 | memset(comedi_file_info_table, 0, |
1964 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); | |
ed9eccbe DS |
1965 | |
1966 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1967 | COMEDI_NUM_MINORS, "comedi"); |
ed9eccbe DS |
1968 | if (retval) |
1969 | return -EIO; | |
1970 | cdev_init(&comedi_cdev, &comedi_fops); | |
1971 | comedi_cdev.owner = THIS_MODULE; | |
1972 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
1973 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
1974 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1975 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1976 | return -EIO; |
1977 | } | |
1978 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
1979 | if (IS_ERR(comedi_class)) { | |
3fffdf20 | 1980 | printk(KERN_ERR "comedi: failed to create class"); |
ed9eccbe DS |
1981 | cdev_del(&comedi_cdev); |
1982 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1983 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1984 | return PTR_ERR(comedi_class); |
1985 | } | |
1986 | ||
1987 | /* XXX requires /proc interface */ | |
1988 | comedi_proc_init(); | |
1989 | ||
476b8477 | 1990 | /* create devices files for legacy/manual use */ |
1dd33ab8 | 1991 | for (i = 0; i < comedi_num_legacy_minors; i++) { |
ed9eccbe DS |
1992 | int minor; |
1993 | minor = comedi_alloc_board_minor(NULL); | |
476b8477 | 1994 | if (minor < 0) { |
ed9eccbe DS |
1995 | comedi_cleanup_legacy_minors(); |
1996 | cdev_del(&comedi_cdev); | |
1997 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1998 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1999 | return minor; |
2000 | } | |
2001 | } | |
2002 | ||
ed9eccbe DS |
2003 | return 0; |
2004 | } | |
2005 | ||
2006 | static void __exit comedi_cleanup(void) | |
2007 | { | |
2008 | int i; | |
2009 | ||
2010 | comedi_cleanup_legacy_minors(); | |
476b8477 | 2011 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
ed9eccbe | 2012 | BUG_ON(comedi_file_info_table[i]); |
476b8477 | 2013 | |
ed9eccbe DS |
2014 | class_destroy(comedi_class); |
2015 | cdev_del(&comedi_cdev); | |
2016 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2017 | ||
2018 | comedi_proc_cleanup(); | |
ed9eccbe DS |
2019 | } |
2020 | ||
2021 | module_init(comedi_init); | |
2022 | module_exit(comedi_cleanup); | |
2023 | ||
71b5f4f1 | 2024 | void comedi_error(const struct comedi_device *dev, const char *s) |
ed9eccbe | 2025 | { |
3fffdf20 MR |
2026 | printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, |
2027 | dev->driver->driver_name, s); | |
ed9eccbe | 2028 | } |
18736438 | 2029 | EXPORT_SYMBOL(comedi_error); |
ed9eccbe | 2030 | |
34c43922 | 2031 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 2032 | { |
d163679c | 2033 | struct comedi_async *async = s->async; |
ed9eccbe DS |
2034 | unsigned runflags = 0; |
2035 | unsigned runflags_mask = 0; | |
2036 | ||
476b8477 | 2037 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
ed9eccbe DS |
2038 | |
2039 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) | |
2040 | return; | |
2041 | ||
0a85b6f0 MT |
2042 | if (s-> |
2043 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2044 | COMEDI_CB_OVERFLOW)) { | |
ed9eccbe DS |
2045 | runflags_mask |= SRF_RUNNING; |
2046 | } | |
2047 | /* remember if an error event has occured, so an error | |
2048 | * can be returned the next time the user does a read() */ | |
2049 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2050 | runflags_mask |= SRF_ERROR; | |
2051 | runflags |= SRF_ERROR; | |
2052 | } | |
2053 | if (runflags_mask) { | |
2054 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2055 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
2056 | } | |
2057 | ||
2058 | if (async->cb_mask & s->async->events) { | |
2059 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
fcea1154 | 2060 | wake_up_interruptible(&async->wait_head); |
6705b68d | 2061 | if (s->subdev_flags & SDF_CMD_READ) |
0a85b6f0 | 2062 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); |
6705b68d | 2063 | if (s->subdev_flags & SDF_CMD_WRITE) |
0a85b6f0 | 2064 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); |
ed9eccbe DS |
2065 | } else { |
2066 | if (async->cb_func) | |
2067 | async->cb_func(s->async->events, async->cb_arg); | |
ed9eccbe DS |
2068 | } |
2069 | } | |
2070 | s->async->events = 0; | |
2071 | } | |
18736438 | 2072 | EXPORT_SYMBOL(comedi_event); |
ed9eccbe | 2073 | |
34c43922 | 2074 | unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
ed9eccbe DS |
2075 | { |
2076 | unsigned long flags; | |
2077 | unsigned runflags; | |
2078 | ||
5f74ea14 | 2079 | spin_lock_irqsave(&s->spin_lock, flags); |
ed9eccbe | 2080 | runflags = s->runflags; |
5f74ea14 | 2081 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe DS |
2082 | return runflags; |
2083 | } | |
18736438 | 2084 | EXPORT_SYMBOL(comedi_get_subdevice_runflags); |
ed9eccbe | 2085 | |
71b5f4f1 | 2086 | static int is_device_busy(struct comedi_device *dev) |
ed9eccbe | 2087 | { |
34c43922 | 2088 | struct comedi_subdevice *s; |
ed9eccbe DS |
2089 | int i; |
2090 | ||
2091 | if (!dev->attached) | |
2092 | return 0; | |
2093 | ||
2094 | for (i = 0; i < dev->n_subdevices; i++) { | |
2095 | s = dev->subdevices + i; | |
2096 | if (s->busy) | |
2097 | return 1; | |
2098 | if (s->async && s->async->mmap_count) | |
2099 | return 1; | |
2100 | } | |
2101 | ||
2102 | return 0; | |
2103 | } | |
2104 | ||
92d0127c | 2105 | static void comedi_device_init(struct comedi_device *dev) |
ed9eccbe | 2106 | { |
71b5f4f1 | 2107 | memset(dev, 0, sizeof(struct comedi_device)); |
ed9eccbe DS |
2108 | spin_lock_init(&dev->spinlock); |
2109 | mutex_init(&dev->mutex); | |
2110 | dev->minor = -1; | |
2111 | } | |
2112 | ||
92d0127c | 2113 | static void comedi_device_cleanup(struct comedi_device *dev) |
ed9eccbe | 2114 | { |
476b8477 GKH |
2115 | if (dev == NULL) |
2116 | return; | |
ed9eccbe DS |
2117 | mutex_lock(&dev->mutex); |
2118 | comedi_device_detach(dev); | |
2119 | mutex_unlock(&dev->mutex); | |
2120 | mutex_destroy(&dev->mutex); | |
2121 | } | |
2122 | ||
2123 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2124 | { | |
2125 | unsigned long flags; | |
2126 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2127 | struct device *csdev; |
ed9eccbe | 2128 | unsigned i; |
883db3d9 | 2129 | int retval; |
ed9eccbe DS |
2130 | |
2131 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2132 | if (info == NULL) |
2133 | return -ENOMEM; | |
71b5f4f1 | 2134 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
476b8477 | 2135 | if (info->device == NULL) { |
ed9eccbe DS |
2136 | kfree(info); |
2137 | return -ENOMEM; | |
2138 | } | |
2139 | comedi_device_init(info->device); | |
5f74ea14 | 2140 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
476b8477 GKH |
2141 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
2142 | if (comedi_file_info_table[i] == NULL) { | |
ed9eccbe DS |
2143 | comedi_file_info_table[i] = info; |
2144 | break; | |
2145 | } | |
2146 | } | |
5f74ea14 | 2147 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2148 | if (i == COMEDI_NUM_BOARD_MINORS) { |
ed9eccbe DS |
2149 | comedi_device_cleanup(info->device); |
2150 | kfree(info->device); | |
2151 | kfree(info); | |
0a85b6f0 | 2152 | printk(KERN_ERR |
21fe2eea M |
2153 | "comedi: error: " |
2154 | "ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2155 | return -EBUSY; |
2156 | } | |
2157 | info->device->minor = i; | |
2158 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, | |
476b8477 GKH |
2159 | MKDEV(COMEDI_MAJOR, i), NULL, |
2160 | hardware_device, "comedi%i", i); | |
2161 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2162 | info->device->class_dev = csdev; |
883db3d9 FMH |
2163 | dev_set_drvdata(csdev, info); |
2164 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2165 | if (retval) { | |
0a85b6f0 | 2166 | printk(KERN_ERR |
21fe2eea M |
2167 | "comedi: " |
2168 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2169 | dev_attr_max_read_buffer_kb.attr.name); |
883db3d9 FMH |
2170 | comedi_free_board_minor(i); |
2171 | return retval; | |
2172 | } | |
2173 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2174 | if (retval) { | |
0a85b6f0 | 2175 | printk(KERN_ERR |
21fe2eea M |
2176 | "comedi: " |
2177 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2178 | dev_attr_read_buffer_kb.attr.name); |
883db3d9 FMH |
2179 | comedi_free_board_minor(i); |
2180 | return retval; | |
2181 | } | |
2182 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2183 | if (retval) { | |
0a85b6f0 | 2184 | printk(KERN_ERR |
21fe2eea M |
2185 | "comedi: " |
2186 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2187 | dev_attr_max_write_buffer_kb.attr.name); |
883db3d9 FMH |
2188 | comedi_free_board_minor(i); |
2189 | return retval; | |
2190 | } | |
2191 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2192 | if (retval) { | |
0a85b6f0 | 2193 | printk(KERN_ERR |
21fe2eea M |
2194 | "comedi: " |
2195 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2196 | dev_attr_write_buffer_kb.attr.name); |
883db3d9 FMH |
2197 | comedi_free_board_minor(i); |
2198 | return retval; | |
2199 | } | |
ed9eccbe DS |
2200 | return i; |
2201 | } | |
2202 | ||
2203 | void comedi_free_board_minor(unsigned minor) | |
2204 | { | |
2205 | unsigned long flags; | |
2206 | struct comedi_device_file_info *info; | |
2207 | ||
2208 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
5f74ea14 | 2209 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2210 | info = comedi_file_info_table[minor]; |
2211 | comedi_file_info_table[minor] = NULL; | |
5f74ea14 | 2212 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2213 | |
476b8477 | 2214 | if (info) { |
71b5f4f1 | 2215 | struct comedi_device *dev = info->device; |
476b8477 GKH |
2216 | if (dev) { |
2217 | if (dev->class_dev) { | |
2218 | device_destroy(comedi_class, | |
2219 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
ed9eccbe DS |
2220 | } |
2221 | comedi_device_cleanup(dev); | |
2222 | kfree(dev); | |
2223 | } | |
2224 | kfree(info); | |
2225 | } | |
2226 | } | |
2227 | ||
883db3d9 FMH |
2228 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
2229 | struct comedi_subdevice *s) | |
ed9eccbe DS |
2230 | { |
2231 | unsigned long flags; | |
2232 | struct comedi_device_file_info *info; | |
0bfbbe8f | 2233 | struct device *csdev; |
ed9eccbe | 2234 | unsigned i; |
883db3d9 | 2235 | int retval; |
ed9eccbe DS |
2236 | |
2237 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2238 | if (info == NULL) |
2239 | return -ENOMEM; | |
ed9eccbe DS |
2240 | info->device = dev; |
2241 | info->read_subdevice = s; | |
2242 | info->write_subdevice = s; | |
5f74ea14 | 2243 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
4c41f3ae | 2244 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { |
476b8477 | 2245 | if (comedi_file_info_table[i] == NULL) { |
ed9eccbe DS |
2246 | comedi_file_info_table[i] = info; |
2247 | break; | |
2248 | } | |
2249 | } | |
5f74ea14 | 2250 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
476b8477 | 2251 | if (i == COMEDI_NUM_MINORS) { |
ed9eccbe | 2252 | kfree(info); |
0a85b6f0 | 2253 | printk(KERN_ERR |
21fe2eea M |
2254 | "comedi: error: " |
2255 | "ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2256 | return -EBUSY; |
2257 | } | |
2258 | s->minor = i; | |
2259 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, | |
476b8477 GKH |
2260 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
2261 | "comedi%i_subd%i", dev->minor, | |
2262 | (int)(s - dev->subdevices)); | |
2263 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2264 | s->class_dev = csdev; |
883db3d9 FMH |
2265 | dev_set_drvdata(csdev, info); |
2266 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); | |
2267 | if (retval) { | |
0a85b6f0 | 2268 | printk(KERN_ERR |
21fe2eea M |
2269 | "comedi: " |
2270 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2271 | dev_attr_max_read_buffer_kb.attr.name); |
883db3d9 FMH |
2272 | comedi_free_subdevice_minor(s); |
2273 | return retval; | |
2274 | } | |
2275 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); | |
2276 | if (retval) { | |
0a85b6f0 | 2277 | printk(KERN_ERR |
21fe2eea M |
2278 | "comedi: " |
2279 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2280 | dev_attr_read_buffer_kb.attr.name); |
883db3d9 FMH |
2281 | comedi_free_subdevice_minor(s); |
2282 | return retval; | |
2283 | } | |
2284 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); | |
2285 | if (retval) { | |
0a85b6f0 | 2286 | printk(KERN_ERR |
21fe2eea M |
2287 | "comedi: " |
2288 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2289 | dev_attr_max_write_buffer_kb.attr.name); |
883db3d9 FMH |
2290 | comedi_free_subdevice_minor(s); |
2291 | return retval; | |
2292 | } | |
2293 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); | |
2294 | if (retval) { | |
0a85b6f0 | 2295 | printk(KERN_ERR |
21fe2eea M |
2296 | "comedi: " |
2297 | "failed to create sysfs attribute file \"%s\".\n", | |
0a85b6f0 | 2298 | dev_attr_write_buffer_kb.attr.name); |
883db3d9 FMH |
2299 | comedi_free_subdevice_minor(s); |
2300 | return retval; | |
2301 | } | |
ed9eccbe DS |
2302 | return i; |
2303 | } | |
2304 | ||
34c43922 | 2305 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
ed9eccbe DS |
2306 | { |
2307 | unsigned long flags; | |
2308 | struct comedi_device_file_info *info; | |
2309 | ||
476b8477 GKH |
2310 | if (s == NULL) |
2311 | return; | |
2312 | if (s->minor < 0) | |
2313 | return; | |
ed9eccbe DS |
2314 | |
2315 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); | |
2316 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
2317 | ||
5f74ea14 | 2318 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2319 | info = comedi_file_info_table[s->minor]; |
2320 | comedi_file_info_table[s->minor] = NULL; | |
5f74ea14 | 2321 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2322 | |
476b8477 | 2323 | if (s->class_dev) { |
ed9eccbe DS |
2324 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
2325 | s->class_dev = NULL; | |
2326 | } | |
2327 | kfree(info); | |
2328 | } | |
2329 | ||
2330 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) | |
2331 | { | |
2332 | unsigned long flags; | |
2333 | struct comedi_device_file_info *info; | |
2334 | ||
2335 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
5f74ea14 | 2336 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
ed9eccbe | 2337 | info = comedi_file_info_table[minor]; |
5f74ea14 | 2338 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
ed9eccbe DS |
2339 | return info; |
2340 | } | |
18736438 | 2341 | EXPORT_SYMBOL_GPL(comedi_get_device_file_info); |
883db3d9 FMH |
2342 | |
2343 | static int resize_async_buffer(struct comedi_device *dev, | |
2344 | struct comedi_subdevice *s, | |
2345 | struct comedi_async *async, unsigned new_size) | |
2346 | { | |
2347 | int retval; | |
2348 | ||
2349 | if (new_size > async->max_bufsize) | |
2350 | return -EPERM; | |
2351 | ||
2352 | if (s->busy) { | |
2353 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
2354 | return -EBUSY; | |
2355 | } | |
2356 | if (async->mmap_count) { | |
2357 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
2358 | return -EBUSY; | |
2359 | } | |
2360 | ||
2361 | if (!async->prealloc_buf) | |
2362 | return -EINVAL; | |
2363 | ||
2364 | /* make sure buffer is an integral number of pages | |
0a85b6f0 | 2365 | * (we round up) */ |
883db3d9 FMH |
2366 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
2367 | ||
2368 | retval = comedi_buf_alloc(dev, s, new_size); | |
2369 | if (retval < 0) | |
2370 | return retval; | |
2371 | ||
2372 | if (s->buf_change) { | |
2373 | retval = s->buf_change(dev, s, new_size); | |
2374 | if (retval < 0) | |
2375 | return retval; | |
2376 | } | |
2377 | ||
2378 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
b8b5cd9f | 2379 | dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); |
883db3d9 FMH |
2380 | return 0; |
2381 | } | |
2382 | ||
2383 | /* sysfs attribute files */ | |
2384 | ||
2385 | static const unsigned bytes_per_kibi = 1024; | |
2386 | ||
2387 | static ssize_t show_max_read_buffer_kb(struct device *dev, | |
2388 | struct device_attribute *attr, char *buf) | |
2389 | { | |
2390 | ssize_t retval; | |
2391 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2392 | unsigned max_buffer_size_kb = 0; | |
2393 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2394 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2395 | |
2396 | mutex_lock(&info->device->mutex); | |
2397 | if (read_subdevice && | |
2398 | (read_subdevice->subdev_flags & SDF_CMD_READ) && | |
2399 | read_subdevice->async) { | |
2400 | max_buffer_size_kb = read_subdevice->async->max_bufsize / | |
0a85b6f0 | 2401 | bytes_per_kibi; |
883db3d9 | 2402 | } |
0a85b6f0 | 2403 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2404 | mutex_unlock(&info->device->mutex); |
2405 | ||
2406 | return retval; | |
2407 | } | |
2408 | ||
2409 | static ssize_t store_max_read_buffer_kb(struct device *dev, | |
2410 | struct device_attribute *attr, | |
2411 | const char *buf, size_t count) | |
2412 | { | |
2413 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2414 | unsigned long new_max_size_kb; | |
2415 | uint64_t new_max_size; | |
2416 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2417 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2418 | |
2419 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2420 | return -EINVAL; | |
0a85b6f0 | 2421 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2422 | return -EINVAL; |
0a85b6f0 MT |
2423 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2424 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2425 | return -EINVAL; |
2426 | ||
2427 | mutex_lock(&info->device->mutex); | |
2428 | if (read_subdevice == NULL || | |
2429 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2430 | read_subdevice->async == NULL) { | |
2431 | mutex_unlock(&info->device->mutex); | |
2432 | return -EINVAL; | |
2433 | } | |
2434 | read_subdevice->async->max_bufsize = new_max_size; | |
2435 | mutex_unlock(&info->device->mutex); | |
2436 | ||
2437 | return count; | |
2438 | } | |
2439 | ||
2440 | static struct device_attribute dev_attr_max_read_buffer_kb = { | |
2441 | .attr = { | |
0a85b6f0 MT |
2442 | .name = "max_read_buffer_kb", |
2443 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2444 | .show = &show_max_read_buffer_kb, |
2445 | .store = &store_max_read_buffer_kb | |
2446 | }; | |
2447 | ||
2448 | static ssize_t show_read_buffer_kb(struct device *dev, | |
2449 | struct device_attribute *attr, char *buf) | |
2450 | { | |
2451 | ssize_t retval; | |
2452 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2453 | unsigned buffer_size_kb = 0; | |
2454 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2455 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2456 | |
2457 | mutex_lock(&info->device->mutex); | |
2458 | if (read_subdevice && | |
0a85b6f0 MT |
2459 | (read_subdevice->subdev_flags & SDF_CMD_READ) && |
2460 | read_subdevice->async) { | |
883db3d9 | 2461 | buffer_size_kb = read_subdevice->async->prealloc_bufsz / |
0a85b6f0 | 2462 | bytes_per_kibi; |
883db3d9 | 2463 | } |
0a85b6f0 | 2464 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2465 | mutex_unlock(&info->device->mutex); |
2466 | ||
2467 | return retval; | |
2468 | } | |
2469 | ||
2470 | static ssize_t store_read_buffer_kb(struct device *dev, | |
2471 | struct device_attribute *attr, | |
2472 | const char *buf, size_t count) | |
2473 | { | |
2474 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2475 | unsigned long new_size_kb; | |
2476 | uint64_t new_size; | |
2477 | int retval; | |
2478 | struct comedi_subdevice *const read_subdevice = | |
0a85b6f0 | 2479 | comedi_get_read_subdevice(info); |
883db3d9 FMH |
2480 | |
2481 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2482 | return -EINVAL; | |
0a85b6f0 | 2483 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2484 | return -EINVAL; |
0a85b6f0 MT |
2485 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2486 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2487 | return -EINVAL; |
2488 | ||
2489 | mutex_lock(&info->device->mutex); | |
2490 | if (read_subdevice == NULL || | |
2491 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || | |
2492 | read_subdevice->async == NULL) { | |
2493 | mutex_unlock(&info->device->mutex); | |
2494 | return -EINVAL; | |
2495 | } | |
2496 | retval = resize_async_buffer(info->device, read_subdevice, | |
2497 | read_subdevice->async, new_size); | |
2498 | mutex_unlock(&info->device->mutex); | |
2499 | ||
2500 | if (retval < 0) | |
2501 | return retval; | |
2502 | return count; | |
2503 | } | |
2504 | ||
2505 | static struct device_attribute dev_attr_read_buffer_kb = { | |
2506 | .attr = { | |
0a85b6f0 MT |
2507 | .name = "read_buffer_kb", |
2508 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2509 | .show = &show_read_buffer_kb, |
2510 | .store = &store_read_buffer_kb | |
2511 | }; | |
2512 | ||
2513 | static ssize_t show_max_write_buffer_kb(struct device *dev, | |
2514 | struct device_attribute *attr, | |
2515 | char *buf) | |
2516 | { | |
2517 | ssize_t retval; | |
2518 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2519 | unsigned max_buffer_size_kb = 0; | |
2520 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2521 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2522 | |
2523 | mutex_lock(&info->device->mutex); | |
2524 | if (write_subdevice && | |
2525 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2526 | write_subdevice->async) { | |
2527 | max_buffer_size_kb = write_subdevice->async->max_bufsize / | |
0a85b6f0 | 2528 | bytes_per_kibi; |
883db3d9 | 2529 | } |
0a85b6f0 | 2530 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
883db3d9 FMH |
2531 | mutex_unlock(&info->device->mutex); |
2532 | ||
2533 | return retval; | |
2534 | } | |
2535 | ||
2536 | static ssize_t store_max_write_buffer_kb(struct device *dev, | |
2537 | struct device_attribute *attr, | |
2538 | const char *buf, size_t count) | |
2539 | { | |
2540 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2541 | unsigned long new_max_size_kb; | |
2542 | uint64_t new_max_size; | |
2543 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2544 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2545 | |
2546 | if (strict_strtoul(buf, 10, &new_max_size_kb)) | |
2547 | return -EINVAL; | |
0a85b6f0 | 2548 | if (new_max_size_kb != (uint32_t) new_max_size_kb) |
883db3d9 | 2549 | return -EINVAL; |
0a85b6f0 MT |
2550 | new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; |
2551 | if (new_max_size != (uint32_t) new_max_size) | |
883db3d9 FMH |
2552 | return -EINVAL; |
2553 | ||
2554 | mutex_lock(&info->device->mutex); | |
2555 | if (write_subdevice == NULL || | |
2556 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2557 | write_subdevice->async == NULL) { | |
2558 | mutex_unlock(&info->device->mutex); | |
2559 | return -EINVAL; | |
2560 | } | |
2561 | write_subdevice->async->max_bufsize = new_max_size; | |
2562 | mutex_unlock(&info->device->mutex); | |
2563 | ||
2564 | return count; | |
2565 | } | |
2566 | ||
2567 | static struct device_attribute dev_attr_max_write_buffer_kb = { | |
2568 | .attr = { | |
0a85b6f0 MT |
2569 | .name = "max_write_buffer_kb", |
2570 | .mode = S_IRUGO | S_IWUSR}, | |
883db3d9 FMH |
2571 | .show = &show_max_write_buffer_kb, |
2572 | .store = &store_max_write_buffer_kb | |
2573 | }; | |
2574 | ||
2575 | static ssize_t show_write_buffer_kb(struct device *dev, | |
2576 | struct device_attribute *attr, char *buf) | |
2577 | { | |
2578 | ssize_t retval; | |
2579 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2580 | unsigned buffer_size_kb = 0; | |
2581 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2582 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2583 | |
2584 | mutex_lock(&info->device->mutex); | |
2585 | if (write_subdevice && | |
2586 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && | |
2587 | write_subdevice->async) { | |
2588 | buffer_size_kb = write_subdevice->async->prealloc_bufsz / | |
0a85b6f0 | 2589 | bytes_per_kibi; |
883db3d9 | 2590 | } |
0a85b6f0 | 2591 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
883db3d9 FMH |
2592 | mutex_unlock(&info->device->mutex); |
2593 | ||
2594 | return retval; | |
2595 | } | |
2596 | ||
2597 | static ssize_t store_write_buffer_kb(struct device *dev, | |
2598 | struct device_attribute *attr, | |
2599 | const char *buf, size_t count) | |
2600 | { | |
2601 | struct comedi_device_file_info *info = dev_get_drvdata(dev); | |
2602 | unsigned long new_size_kb; | |
2603 | uint64_t new_size; | |
2604 | int retval; | |
2605 | struct comedi_subdevice *const write_subdevice = | |
0a85b6f0 | 2606 | comedi_get_write_subdevice(info); |
883db3d9 FMH |
2607 | |
2608 | if (strict_strtoul(buf, 10, &new_size_kb)) | |
2609 | return -EINVAL; | |
0a85b6f0 | 2610 | if (new_size_kb != (uint32_t) new_size_kb) |
883db3d9 | 2611 | return -EINVAL; |
0a85b6f0 MT |
2612 | new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; |
2613 | if (new_size != (uint32_t) new_size) | |
883db3d9 FMH |
2614 | return -EINVAL; |
2615 | ||
2616 | mutex_lock(&info->device->mutex); | |
2617 | if (write_subdevice == NULL || | |
2618 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || | |
2619 | write_subdevice->async == NULL) { | |
2620 | mutex_unlock(&info->device->mutex); | |
2621 | return -EINVAL; | |
2622 | } | |
2623 | retval = resize_async_buffer(info->device, write_subdevice, | |
0a85b6f0 | 2624 | write_subdevice->async, new_size); |
883db3d9 FMH |
2625 | mutex_unlock(&info->device->mutex); |
2626 | ||
2627 | if (retval < 0) | |
2628 | return retval; | |
2629 | return count; | |
2630 | } | |
2631 | ||
2632 | static struct device_attribute dev_attr_write_buffer_kb = { | |
2633 | .attr = { | |
0a85b6f0 MT |
2634 | .name = "write_buffer_kb", |
2635 | .mode = S_IRUGO | S_IWUSR | S_IWGRP}, | |
883db3d9 FMH |
2636 | .show = &show_write_buffer_kb, |
2637 | .store = &store_write_buffer_kb | |
2638 | }; |