Commit | Line | Data |
---|---|---|
ed9eccbe DS |
1 | /* |
2 | module/drivers.c | |
3 | functions for manipulating drivers | |
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 | #define _GNU_SOURCE | |
25 | ||
26 | #define __NO_VERSION__ | |
27 | #include "comedi_fops.h" | |
28 | #include <linux/device.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/pci.h> | |
c28264da | 31 | #include <linux/usb.h> |
ed9eccbe | 32 | #include <linux/errno.h> |
78b10615 | 33 | #include <linux/kconfig.h> |
ed9eccbe DS |
34 | #include <linux/kernel.h> |
35 | #include <linux/sched.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/delay.h> | |
38 | #include <linux/ioport.h> | |
39 | #include <linux/mm.h> | |
40 | #include <linux/slab.h> | |
ed9eccbe DS |
41 | #include <linux/highmem.h> /* for SuSE brokenness */ |
42 | #include <linux/vmalloc.h> | |
43 | #include <linux/cdev.h> | |
44 | #include <linux/dma-mapping.h> | |
5617f9da | 45 | #include <linux/io.h> |
ed9eccbe | 46 | |
242e7ad9 GKH |
47 | #include "comedidev.h" |
48 | #include "internal.h" | |
49 | ||
71b5f4f1 | 50 | static int postconfig(struct comedi_device *dev); |
0a85b6f0 MT |
51 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
52 | struct comedi_subdevice *s, | |
53 | struct comedi_insn *insn, unsigned int *data); | |
54 | static void *comedi_recognize(struct comedi_driver *driv, const char *name); | |
139dfbdf | 55 | static void comedi_report_boards(struct comedi_driver *driv); |
34c43922 | 56 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s); |
ed9eccbe | 57 | |
139dfbdf | 58 | struct comedi_driver *comedi_drivers; |
ed9eccbe | 59 | |
71b5f4f1 | 60 | static void cleanup_device(struct comedi_device *dev) |
ed9eccbe DS |
61 | { |
62 | int i; | |
34c43922 | 63 | struct comedi_subdevice *s; |
ed9eccbe DS |
64 | |
65 | if (dev->subdevices) { | |
66 | for (i = 0; i < dev->n_subdevices; i++) { | |
67 | s = dev->subdevices + i; | |
68 | comedi_free_subdevice_minor(s); | |
69 | if (s->async) { | |
70 | comedi_buf_alloc(dev, s, 0); | |
71 | kfree(s->async); | |
72 | } | |
73 | } | |
74 | kfree(dev->subdevices); | |
75 | dev->subdevices = NULL; | |
76 | dev->n_subdevices = 0; | |
77 | } | |
dedd1325 BP |
78 | kfree(dev->private); |
79 | dev->private = NULL; | |
7029a874 | 80 | dev->driver = NULL; |
ed9eccbe DS |
81 | dev->board_name = NULL; |
82 | dev->board_ptr = NULL; | |
83 | dev->iobase = 0; | |
84 | dev->irq = 0; | |
85 | dev->read_subdev = NULL; | |
86 | dev->write_subdev = NULL; | |
87 | dev->open = NULL; | |
88 | dev->close = NULL; | |
89 | comedi_set_hw_dev(dev, NULL); | |
90 | } | |
91 | ||
71b5f4f1 | 92 | static void __comedi_device_detach(struct comedi_device *dev) |
ed9eccbe DS |
93 | { |
94 | dev->attached = 0; | |
5617f9da | 95 | if (dev->driver) |
ed9eccbe | 96 | dev->driver->detach(dev); |
5617f9da | 97 | else |
67b0e64a MR |
98 | printk(KERN_WARNING |
99 | "BUG: dev->driver=NULL in comedi_device_detach()\n"); | |
ed9eccbe DS |
100 | cleanup_device(dev); |
101 | } | |
102 | ||
71b5f4f1 | 103 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe DS |
104 | { |
105 | if (!dev->attached) | |
106 | return; | |
107 | __comedi_device_detach(dev); | |
108 | } | |
109 | ||
3902a370 IA |
110 | /* do a little post-config cleanup */ |
111 | /* called with module refcount incremented, decrements it */ | |
112 | static int comedi_device_postconfig(struct comedi_device *dev) | |
113 | { | |
114 | int ret = postconfig(dev); | |
115 | module_put(dev->driver->module); | |
116 | if (ret < 0) { | |
117 | __comedi_device_detach(dev); | |
118 | return ret; | |
119 | } | |
120 | if (!dev->board_name) { | |
121 | printk(KERN_WARNING "BUG: dev->board_name=<%p>\n", | |
122 | dev->board_name); | |
123 | dev->board_name = "BUG"; | |
124 | } | |
125 | smp_wmb(); | |
126 | dev->attached = 1; | |
127 | return 0; | |
128 | } | |
129 | ||
0707bb04 | 130 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 131 | { |
139dfbdf | 132 | struct comedi_driver *driv; |
ed9eccbe DS |
133 | int ret; |
134 | ||
135 | if (dev->attached) | |
136 | return -EBUSY; | |
137 | ||
138 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
139 | if (!try_module_get(driv->module)) { | |
88ab8a84 | 140 | printk(KERN_INFO "comedi: failed to increment module count, skipping\n"); |
ed9eccbe DS |
141 | continue; |
142 | } | |
143 | if (driv->num_names) { | |
144 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
3902a370 IA |
145 | if (dev->board_ptr) |
146 | break; | |
147 | } else if (strcmp(driv->driver_name, it->board_name)) | |
148 | break; | |
149 | module_put(driv->module); | |
150 | } | |
151 | if (driv == NULL) { | |
152 | /* recognize has failed if we get here */ | |
153 | /* report valid board names before returning error */ | |
154 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
155 | if (!try_module_get(driv->module)) { | |
156 | printk(KERN_INFO | |
157 | "comedi: failed to increment module count\n"); | |
ed9eccbe DS |
158 | continue; |
159 | } | |
3902a370 IA |
160 | comedi_report_boards(driv); |
161 | module_put(driv->module); | |
ed9eccbe | 162 | } |
3902a370 | 163 | return -EIO; |
ed9eccbe | 164 | } |
3902a370 IA |
165 | /* initialize dev->driver here so |
166 | * comedi_error() can be called from attach */ | |
167 | dev->driver = driv; | |
168 | ret = driv->attach(dev, it); | |
ed9eccbe | 169 | if (ret < 0) { |
3902a370 | 170 | module_put(dev->driver->module); |
ed9eccbe DS |
171 | __comedi_device_detach(dev); |
172 | return ret; | |
173 | } | |
3902a370 | 174 | return comedi_device_postconfig(dev); |
ed9eccbe DS |
175 | } |
176 | ||
139dfbdf | 177 | int comedi_driver_register(struct comedi_driver *driver) |
ed9eccbe DS |
178 | { |
179 | driver->next = comedi_drivers; | |
180 | comedi_drivers = driver; | |
181 | ||
182 | return 0; | |
183 | } | |
d58214b0 | 184 | EXPORT_SYMBOL(comedi_driver_register); |
ed9eccbe | 185 | |
139dfbdf | 186 | int comedi_driver_unregister(struct comedi_driver *driver) |
ed9eccbe | 187 | { |
139dfbdf | 188 | struct comedi_driver *prev; |
ed9eccbe DS |
189 | int i; |
190 | ||
191 | /* check for devices using this driver */ | |
192 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
0a85b6f0 MT |
193 | struct comedi_device_file_info *dev_file_info = |
194 | comedi_get_device_file_info(i); | |
71b5f4f1 | 195 | struct comedi_device *dev; |
ed9eccbe | 196 | |
0a85b6f0 MT |
197 | if (dev_file_info == NULL) |
198 | continue; | |
ed9eccbe DS |
199 | dev = dev_file_info->device; |
200 | ||
201 | mutex_lock(&dev->mutex); | |
202 | if (dev->attached && dev->driver == driver) { | |
203 | if (dev->use_count) | |
88ab8a84 XF |
204 | printk(KERN_WARNING "BUG! detaching device with use_count=%d\n", |
205 | dev->use_count); | |
ed9eccbe DS |
206 | comedi_device_detach(dev); |
207 | } | |
208 | mutex_unlock(&dev->mutex); | |
209 | } | |
210 | ||
211 | if (comedi_drivers == driver) { | |
212 | comedi_drivers = driver->next; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
217 | if (prev->next == driver) { | |
218 | prev->next = driver->next; | |
219 | return 0; | |
220 | } | |
221 | } | |
222 | return -EINVAL; | |
223 | } | |
d58214b0 | 224 | EXPORT_SYMBOL(comedi_driver_unregister); |
ed9eccbe | 225 | |
71b5f4f1 | 226 | static int postconfig(struct comedi_device *dev) |
ed9eccbe DS |
227 | { |
228 | int i; | |
34c43922 | 229 | struct comedi_subdevice *s; |
d163679c | 230 | struct comedi_async *async = NULL; |
ed9eccbe DS |
231 | int ret; |
232 | ||
233 | for (i = 0; i < dev->n_subdevices; i++) { | |
234 | s = dev->subdevices + i; | |
235 | ||
236 | if (s->type == COMEDI_SUBD_UNUSED) | |
237 | continue; | |
238 | ||
239 | if (s->len_chanlist == 0) | |
240 | s->len_chanlist = 1; | |
241 | ||
242 | if (s->do_cmd) { | |
4d7df821 IA |
243 | unsigned int buf_size; |
244 | ||
ed9eccbe | 245 | BUG_ON((s->subdev_flags & (SDF_CMD_READ | |
0a85b6f0 | 246 | SDF_CMD_WRITE)) == 0); |
ed9eccbe DS |
247 | BUG_ON(!s->do_cmdtest); |
248 | ||
0a85b6f0 MT |
249 | async = |
250 | kzalloc(sizeof(struct comedi_async), GFP_KERNEL); | |
ed9eccbe | 251 | if (async == NULL) { |
67b0e64a MR |
252 | printk(KERN_INFO |
253 | "failed to allocate async struct\n"); | |
ed9eccbe DS |
254 | return -ENOMEM; |
255 | } | |
256 | init_waitqueue_head(&async->wait_head); | |
257 | async->subdevice = s; | |
258 | s->async = async; | |
259 | ||
4d7df821 IA |
260 | async->max_bufsize = |
261 | comedi_default_buf_maxsize_kb * 1024; | |
262 | buf_size = comedi_default_buf_size_kb * 1024; | |
263 | if (buf_size > async->max_bufsize) | |
264 | buf_size = async->max_bufsize; | |
ed9eccbe DS |
265 | |
266 | async->prealloc_buf = NULL; | |
267 | async->prealloc_bufsz = 0; | |
4d7df821 | 268 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { |
ac4898a0 | 269 | printk(KERN_INFO "Buffer allocation failed\n"); |
ed9eccbe DS |
270 | return -ENOMEM; |
271 | } | |
272 | if (s->buf_change) { | |
4d7df821 | 273 | ret = s->buf_change(dev, s, buf_size); |
ed9eccbe DS |
274 | if (ret < 0) |
275 | return ret; | |
276 | } | |
277 | comedi_alloc_subdevice_minor(dev, s); | |
278 | } | |
279 | ||
280 | if (!s->range_table && !s->range_table_list) | |
281 | s->range_table = &range_unknown; | |
282 | ||
283 | if (!s->insn_read && s->insn_bits) | |
284 | s->insn_read = insn_rw_emulate_bits; | |
285 | if (!s->insn_write && s->insn_bits) | |
286 | s->insn_write = insn_rw_emulate_bits; | |
287 | ||
288 | if (!s->insn_read) | |
289 | s->insn_read = insn_inval; | |
290 | if (!s->insn_write) | |
291 | s->insn_write = insn_inval; | |
292 | if (!s->insn_bits) | |
293 | s->insn_bits = insn_inval; | |
294 | if (!s->insn_config) | |
295 | s->insn_config = insn_inval; | |
296 | ||
297 | if (!s->poll) | |
298 | s->poll = poll_invalid; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
ac4898a0 ZR |
304 | /* generic recognize function for drivers |
305 | * that register their supported board names */ | |
7029a874 | 306 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe DS |
307 | { |
308 | unsigned i; | |
309 | const char *const *name_ptr = driv->board_name; | |
310 | for (i = 0; i < driv->num_names; i++) { | |
311 | if (strcmp(*name_ptr, name) == 0) | |
312 | return (void *)name_ptr; | |
313 | name_ptr = | |
0a85b6f0 MT |
314 | (const char *const *)((const char *)name_ptr + |
315 | driv->offset); | |
ed9eccbe DS |
316 | } |
317 | ||
318 | return NULL; | |
319 | } | |
320 | ||
7029a874 | 321 | static void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
322 | { |
323 | unsigned int i; | |
324 | const char *const *name_ptr; | |
325 | ||
ac4898a0 | 326 | printk(KERN_INFO "comedi: valid board names for %s driver are:\n", |
0a85b6f0 | 327 | driv->driver_name); |
ed9eccbe DS |
328 | |
329 | name_ptr = driv->board_name; | |
330 | for (i = 0; i < driv->num_names; i++) { | |
ac4898a0 | 331 | printk(KERN_INFO " %s\n", *name_ptr); |
ed9eccbe DS |
332 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
333 | } | |
334 | ||
335 | if (driv->num_names == 0) | |
ac4898a0 | 336 | printk(KERN_INFO " %s\n", driv->driver_name); |
ed9eccbe DS |
337 | } |
338 | ||
34c43922 | 339 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
340 | { |
341 | return -EINVAL; | |
342 | } | |
343 | ||
34c43922 | 344 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
0a85b6f0 | 345 | struct comedi_insn *insn, unsigned int *data) |
ed9eccbe DS |
346 | { |
347 | return -EINVAL; | |
348 | } | |
349 | ||
0a85b6f0 MT |
350 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
351 | struct comedi_subdevice *s, | |
352 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 353 | { |
90035c08 | 354 | struct comedi_insn new_insn; |
ed9eccbe DS |
355 | int ret; |
356 | static const unsigned channels_per_bitfield = 32; | |
357 | ||
358 | unsigned chan = CR_CHAN(insn->chanspec); | |
359 | const unsigned base_bitfield_channel = | |
0a85b6f0 | 360 | (chan < channels_per_bitfield) ? 0 : chan; |
790c5541 | 361 | unsigned int new_data[2]; |
ed9eccbe DS |
362 | memset(new_data, 0, sizeof(new_data)); |
363 | memset(&new_insn, 0, sizeof(new_insn)); | |
364 | new_insn.insn = INSN_BITS; | |
365 | new_insn.chanspec = base_bitfield_channel; | |
366 | new_insn.n = 2; | |
367 | new_insn.data = new_data; | |
368 | new_insn.subdev = insn->subdev; | |
369 | ||
370 | if (insn->insn == INSN_WRITE) { | |
371 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
372 | return -EINVAL; | |
aad4029a MR |
373 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ |
374 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) | |
375 | : 0; /* bits */ | |
ed9eccbe DS |
376 | } |
377 | ||
378 | ret = s->insn_bits(dev, s, &new_insn, new_data); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | ||
5617f9da | 382 | if (insn->insn == INSN_READ) |
ed9eccbe | 383 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; |
ed9eccbe DS |
384 | |
385 | return 1; | |
386 | } | |
387 | ||
d43d27ab | 388 | static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) |
ed9eccbe DS |
389 | { |
390 | unsigned long ret = 0UL; | |
391 | pmd_t *pmd; | |
392 | pte_t *ptep, pte; | |
393 | pud_t *pud; | |
394 | ||
395 | if (!pgd_none(*pgd)) { | |
396 | pud = pud_offset(pgd, adr); | |
397 | pmd = pmd_offset(pud, adr); | |
398 | if (!pmd_none(*pmd)) { | |
399 | ptep = pte_offset_kernel(pmd, adr); | |
400 | pte = *ptep; | |
401 | if (pte_present(pte)) { | |
402 | ret = (unsigned long) | |
0a85b6f0 | 403 | page_address(pte_page(pte)); |
ed9eccbe DS |
404 | ret |= (adr & (PAGE_SIZE - 1)); |
405 | } | |
406 | } | |
407 | } | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static inline unsigned long kvirt_to_kva(unsigned long adr) | |
412 | { | |
413 | unsigned long va, kva; | |
414 | ||
415 | va = adr; | |
416 | kva = uvirt_to_kva(pgd_offset_k(va), va); | |
417 | ||
418 | return kva; | |
419 | } | |
420 | ||
34c43922 | 421 | int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, |
0a85b6f0 | 422 | unsigned long new_size) |
ed9eccbe | 423 | { |
d163679c | 424 | struct comedi_async *async = s->async; |
ed9eccbe DS |
425 | |
426 | /* Round up new_size to multiple of PAGE_SIZE */ | |
427 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
428 | ||
429 | /* if no change is required, do nothing */ | |
5617f9da | 430 | if (async->prealloc_buf && async->prealloc_bufsz == new_size) |
ed9eccbe | 431 | return 0; |
5617f9da | 432 | |
b6c77757 | 433 | /* deallocate old buffer */ |
ed9eccbe DS |
434 | if (async->prealloc_buf) { |
435 | vunmap(async->prealloc_buf); | |
436 | async->prealloc_buf = NULL; | |
437 | async->prealloc_bufsz = 0; | |
438 | } | |
439 | if (async->buf_page_list) { | |
440 | unsigned i; | |
441 | for (i = 0; i < async->n_buf_pages; ++i) { | |
442 | if (async->buf_page_list[i].virt_addr) { | |
88ab8a84 XF |
443 | clear_bit(PG_reserved, |
444 | &(virt_to_page(async->buf_page_list[i]. | |
445 | virt_addr)->flags)); | |
ed9eccbe DS |
446 | if (s->async_dma_dir != DMA_NONE) { |
447 | dma_free_coherent(dev->hw_dev, | |
0a85b6f0 MT |
448 | PAGE_SIZE, |
449 | async-> | |
450 | buf_page_list | |
451 | [i].virt_addr, | |
452 | async-> | |
453 | buf_page_list | |
454 | [i].dma_addr); | |
ed9eccbe | 455 | } else { |
0a85b6f0 MT |
456 | free_page((unsigned long) |
457 | async->buf_page_list[i]. | |
458 | virt_addr); | |
ed9eccbe DS |
459 | } |
460 | } | |
461 | } | |
462 | vfree(async->buf_page_list); | |
463 | async->buf_page_list = NULL; | |
464 | async->n_buf_pages = 0; | |
465 | } | |
b6c77757 | 466 | /* allocate new buffer */ |
ed9eccbe DS |
467 | if (new_size) { |
468 | unsigned i = 0; | |
469 | unsigned n_pages = new_size >> PAGE_SHIFT; | |
470 | struct page **pages = NULL; | |
471 | ||
472 | async->buf_page_list = | |
5b84cc78 | 473 | vzalloc(sizeof(struct comedi_buf_page) * n_pages); |
3ad4e219 | 474 | if (async->buf_page_list) |
ed9eccbe | 475 | pages = vmalloc(sizeof(struct page *) * n_pages); |
3ad4e219 | 476 | |
ed9eccbe DS |
477 | if (pages) { |
478 | for (i = 0; i < n_pages; i++) { | |
479 | if (s->async_dma_dir != DMA_NONE) { | |
480 | async->buf_page_list[i].virt_addr = | |
0a85b6f0 MT |
481 | dma_alloc_coherent(dev->hw_dev, |
482 | PAGE_SIZE, | |
483 | &async-> | |
484 | buf_page_list | |
485 | [i].dma_addr, | |
486 | GFP_KERNEL | | |
487 | __GFP_COMP); | |
ed9eccbe DS |
488 | } else { |
489 | async->buf_page_list[i].virt_addr = | |
0a85b6f0 MT |
490 | (void *) |
491 | get_zeroed_page(GFP_KERNEL); | |
ed9eccbe | 492 | } |
5617f9da | 493 | if (async->buf_page_list[i].virt_addr == NULL) |
ed9eccbe | 494 | break; |
5617f9da | 495 | |
be29eac8 | 496 | set_bit(PG_reserved, |
88ab8a84 XF |
497 | &(virt_to_page(async->buf_page_list[i]. |
498 | virt_addr)->flags)); | |
499 | pages[i] = virt_to_page(async->buf_page_list[i]. | |
500 | virt_addr); | |
ed9eccbe DS |
501 | } |
502 | } | |
503 | if (i == n_pages) { | |
504 | async->prealloc_buf = | |
408093d2 | 505 | #ifdef PAGE_KERNEL_NOCACHE |
0a85b6f0 | 506 | vmap(pages, n_pages, VM_MAP, PAGE_KERNEL_NOCACHE); |
408093d2 GKH |
507 | #else |
508 | vmap(pages, n_pages, VM_MAP, PAGE_KERNEL); | |
509 | #endif | |
ed9eccbe | 510 | } |
b455073c F |
511 | vfree(pages); |
512 | ||
ed9eccbe DS |
513 | if (async->prealloc_buf == NULL) { |
514 | /* Some allocation failed above. */ | |
515 | if (async->buf_page_list) { | |
516 | for (i = 0; i < n_pages; i++) { | |
517 | if (async->buf_page_list[i].virt_addr == | |
0a85b6f0 | 518 | NULL) { |
ed9eccbe DS |
519 | break; |
520 | } | |
88ab8a84 XF |
521 | clear_bit(PG_reserved, |
522 | &(virt_to_page(async-> | |
523 | buf_page_list[i]. | |
524 | virt_addr)->flags)); | |
ed9eccbe DS |
525 | if (s->async_dma_dir != DMA_NONE) { |
526 | dma_free_coherent(dev->hw_dev, | |
0a85b6f0 MT |
527 | PAGE_SIZE, |
528 | async-> | |
529 | buf_page_list | |
530 | [i].virt_addr, | |
531 | async-> | |
532 | buf_page_list | |
533 | [i].dma_addr); | |
ed9eccbe | 534 | } else { |
0a85b6f0 MT |
535 | free_page((unsigned long) |
536 | async->buf_page_list | |
537 | [i].virt_addr); | |
ed9eccbe DS |
538 | } |
539 | } | |
540 | vfree(async->buf_page_list); | |
541 | async->buf_page_list = NULL; | |
542 | } | |
543 | return -ENOMEM; | |
544 | } | |
545 | async->n_buf_pages = n_pages; | |
546 | } | |
547 | async->prealloc_bufsz = new_size; | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | /* munging is applied to data by core as it passes between user | |
553 | * and kernel space */ | |
7029a874 GKH |
554 | static unsigned int comedi_buf_munge(struct comedi_async *async, |
555 | unsigned int num_bytes) | |
ed9eccbe | 556 | { |
34c43922 | 557 | struct comedi_subdevice *s = async->subdevice; |
ed9eccbe DS |
558 | unsigned int count = 0; |
559 | const unsigned num_sample_bytes = bytes_per_sample(s); | |
560 | ||
561 | if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { | |
562 | async->munge_count += num_bytes; | |
2961f24f | 563 | BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); |
ed9eccbe DS |
564 | return num_bytes; |
565 | } | |
566 | /* don't munge partial samples */ | |
567 | num_bytes -= num_bytes % num_sample_bytes; | |
568 | while (count < num_bytes) { | |
569 | int block_size; | |
570 | ||
571 | block_size = num_bytes - count; | |
572 | if (block_size < 0) { | |
67b0e64a MR |
573 | printk(KERN_WARNING |
574 | "%s: %s: bug! block_size is negative\n", | |
0a85b6f0 | 575 | __FILE__, __func__); |
ed9eccbe DS |
576 | break; |
577 | } | |
578 | if ((int)(async->munge_ptr + block_size - | |
0a85b6f0 | 579 | async->prealloc_bufsz) > 0) |
ed9eccbe DS |
580 | block_size = async->prealloc_bufsz - async->munge_ptr; |
581 | ||
582 | s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, | |
0a85b6f0 | 583 | block_size, async->munge_chan); |
ed9eccbe | 584 | |
ac4898a0 ZR |
585 | smp_wmb(); /* barrier insures data is munged in buffer |
586 | * before munge_count is incremented */ | |
ed9eccbe DS |
587 | |
588 | async->munge_chan += block_size / num_sample_bytes; | |
589 | async->munge_chan %= async->cmd.chanlist_len; | |
590 | async->munge_count += block_size; | |
591 | async->munge_ptr += block_size; | |
592 | async->munge_ptr %= async->prealloc_bufsz; | |
593 | count += block_size; | |
594 | } | |
2961f24f | 595 | BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); |
ed9eccbe DS |
596 | return count; |
597 | } | |
598 | ||
d163679c | 599 | unsigned int comedi_buf_write_n_available(struct comedi_async *async) |
ed9eccbe DS |
600 | { |
601 | unsigned int free_end; | |
602 | unsigned int nbytes; | |
603 | ||
604 | if (async == NULL) | |
605 | return 0; | |
606 | ||
607 | free_end = async->buf_read_count + async->prealloc_bufsz; | |
608 | nbytes = free_end - async->buf_write_alloc_count; | |
609 | nbytes -= nbytes % bytes_per_sample(async->subdevice); | |
610 | /* barrier insures the read of buf_read_count in this | |
611 | query occurs before any following writes to the buffer which | |
612 | might be based on the return value from this query. | |
613 | */ | |
614 | smp_mb(); | |
615 | return nbytes; | |
616 | } | |
617 | ||
618 | /* allocates chunk for the writer from free buffer space */ | |
0a85b6f0 MT |
619 | unsigned int comedi_buf_write_alloc(struct comedi_async *async, |
620 | unsigned int nbytes) | |
ed9eccbe DS |
621 | { |
622 | unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; | |
623 | ||
5617f9da | 624 | if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) |
ed9eccbe | 625 | nbytes = free_end - async->buf_write_alloc_count; |
5617f9da | 626 | |
ed9eccbe DS |
627 | async->buf_write_alloc_count += nbytes; |
628 | /* barrier insures the read of buf_read_count above occurs before | |
629 | we write data to the write-alloc'ed buffer space */ | |
630 | smp_mb(); | |
631 | return nbytes; | |
632 | } | |
d58214b0 | 633 | EXPORT_SYMBOL(comedi_buf_write_alloc); |
ed9eccbe DS |
634 | |
635 | /* allocates nothing unless it can completely fulfill the request */ | |
d163679c | 636 | unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async, |
0a85b6f0 | 637 | unsigned int nbytes) |
ed9eccbe DS |
638 | { |
639 | unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; | |
640 | ||
5617f9da | 641 | if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) |
ed9eccbe | 642 | nbytes = 0; |
5617f9da | 643 | |
ed9eccbe DS |
644 | async->buf_write_alloc_count += nbytes; |
645 | /* barrier insures the read of buf_read_count above occurs before | |
646 | we write data to the write-alloc'ed buffer space */ | |
647 | smp_mb(); | |
648 | return nbytes; | |
649 | } | |
650 | ||
651 | /* transfers a chunk from writer to filled buffer space */ | |
d163679c | 652 | unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe DS |
653 | { |
654 | if ((int)(async->buf_write_count + nbytes - | |
0a85b6f0 | 655 | async->buf_write_alloc_count) > 0) { |
88ab8a84 | 656 | printk(KERN_INFO "comedi: attempted to write-free more bytes than have been write-allocated.\n"); |
ed9eccbe DS |
657 | nbytes = async->buf_write_alloc_count - async->buf_write_count; |
658 | } | |
659 | async->buf_write_count += nbytes; | |
660 | async->buf_write_ptr += nbytes; | |
661 | comedi_buf_munge(async, async->buf_write_count - async->munge_count); | |
5617f9da | 662 | if (async->buf_write_ptr >= async->prealloc_bufsz) |
ed9eccbe | 663 | async->buf_write_ptr %= async->prealloc_bufsz; |
5617f9da | 664 | |
ed9eccbe DS |
665 | return nbytes; |
666 | } | |
d58214b0 | 667 | EXPORT_SYMBOL(comedi_buf_write_free); |
ed9eccbe DS |
668 | |
669 | /* allocates a chunk for the reader from filled (and munged) buffer space */ | |
d163679c | 670 | unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes) |
ed9eccbe DS |
671 | { |
672 | if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > | |
0a85b6f0 | 673 | 0) { |
ed9eccbe DS |
674 | nbytes = async->munge_count - async->buf_read_alloc_count; |
675 | } | |
676 | async->buf_read_alloc_count += nbytes; | |
677 | /* barrier insures read of munge_count occurs before we actually read | |
678 | data out of buffer */ | |
679 | smp_rmb(); | |
680 | return nbytes; | |
681 | } | |
d58214b0 | 682 | EXPORT_SYMBOL(comedi_buf_read_alloc); |
ed9eccbe DS |
683 | |
684 | /* transfers control of a chunk from reader to free buffer space */ | |
d163679c | 685 | unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe | 686 | { |
ac4898a0 ZR |
687 | /* barrier insures data has been read out of |
688 | * buffer before read count is incremented */ | |
ed9eccbe DS |
689 | smp_mb(); |
690 | if ((int)(async->buf_read_count + nbytes - | |
0a85b6f0 | 691 | async->buf_read_alloc_count) > 0) { |
67b0e64a MR |
692 | printk(KERN_INFO |
693 | "comedi: attempted to read-free more bytes than have been read-allocated.\n"); | |
ed9eccbe DS |
694 | nbytes = async->buf_read_alloc_count - async->buf_read_count; |
695 | } | |
696 | async->buf_read_count += nbytes; | |
697 | async->buf_read_ptr += nbytes; | |
698 | async->buf_read_ptr %= async->prealloc_bufsz; | |
699 | return nbytes; | |
700 | } | |
d58214b0 | 701 | EXPORT_SYMBOL(comedi_buf_read_free); |
ed9eccbe | 702 | |
d163679c | 703 | void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset, |
0a85b6f0 | 704 | const void *data, unsigned int num_bytes) |
ed9eccbe DS |
705 | { |
706 | unsigned int write_ptr = async->buf_write_ptr + offset; | |
707 | ||
708 | if (write_ptr >= async->prealloc_bufsz) | |
709 | write_ptr %= async->prealloc_bufsz; | |
710 | ||
711 | while (num_bytes) { | |
712 | unsigned int block_size; | |
713 | ||
714 | if (write_ptr + num_bytes > async->prealloc_bufsz) | |
715 | block_size = async->prealloc_bufsz - write_ptr; | |
716 | else | |
717 | block_size = num_bytes; | |
718 | ||
719 | memcpy(async->prealloc_buf + write_ptr, data, block_size); | |
720 | ||
721 | data += block_size; | |
722 | num_bytes -= block_size; | |
723 | ||
724 | write_ptr = 0; | |
725 | } | |
726 | } | |
d58214b0 | 727 | EXPORT_SYMBOL(comedi_buf_memcpy_to); |
ed9eccbe | 728 | |
d163679c | 729 | void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset, |
0a85b6f0 | 730 | void *dest, unsigned int nbytes) |
ed9eccbe DS |
731 | { |
732 | void *src; | |
733 | unsigned int read_ptr = async->buf_read_ptr + offset; | |
734 | ||
735 | if (read_ptr >= async->prealloc_bufsz) | |
736 | read_ptr %= async->prealloc_bufsz; | |
737 | ||
738 | while (nbytes) { | |
739 | unsigned int block_size; | |
740 | ||
741 | src = async->prealloc_buf + read_ptr; | |
742 | ||
743 | if (nbytes >= async->prealloc_bufsz - read_ptr) | |
744 | block_size = async->prealloc_bufsz - read_ptr; | |
745 | else | |
746 | block_size = nbytes; | |
747 | ||
748 | memcpy(dest, src, block_size); | |
749 | nbytes -= block_size; | |
750 | dest += block_size; | |
751 | read_ptr = 0; | |
752 | } | |
753 | } | |
d58214b0 | 754 | EXPORT_SYMBOL(comedi_buf_memcpy_from); |
ed9eccbe | 755 | |
d163679c | 756 | unsigned int comedi_buf_read_n_available(struct comedi_async *async) |
ed9eccbe DS |
757 | { |
758 | unsigned num_bytes; | |
759 | ||
760 | if (async == NULL) | |
761 | return 0; | |
762 | num_bytes = async->munge_count - async->buf_read_count; | |
763 | /* barrier insures the read of munge_count in this | |
764 | query occurs before any following reads of the buffer which | |
765 | might be based on the return value from this query. | |
766 | */ | |
767 | smp_rmb(); | |
768 | return num_bytes; | |
769 | } | |
d58214b0 | 770 | EXPORT_SYMBOL(comedi_buf_read_n_available); |
ed9eccbe | 771 | |
d163679c | 772 | int comedi_buf_get(struct comedi_async *async, short *x) |
ed9eccbe DS |
773 | { |
774 | unsigned int n = comedi_buf_read_n_available(async); | |
775 | ||
790c5541 | 776 | if (n < sizeof(short)) |
ed9eccbe | 777 | return 0; |
790c5541 | 778 | comedi_buf_read_alloc(async, sizeof(short)); |
0a85b6f0 | 779 | *x = *(short *)(async->prealloc_buf + async->buf_read_ptr); |
790c5541 | 780 | comedi_buf_read_free(async, sizeof(short)); |
ed9eccbe DS |
781 | return 1; |
782 | } | |
d58214b0 | 783 | EXPORT_SYMBOL(comedi_buf_get); |
ed9eccbe | 784 | |
d163679c | 785 | int comedi_buf_put(struct comedi_async *async, short x) |
ed9eccbe | 786 | { |
790c5541 | 787 | unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short)); |
ed9eccbe | 788 | |
790c5541 | 789 | if (n < sizeof(short)) { |
ed9eccbe DS |
790 | async->events |= COMEDI_CB_ERROR; |
791 | return 0; | |
792 | } | |
0a85b6f0 | 793 | *(short *)(async->prealloc_buf + async->buf_write_ptr) = x; |
790c5541 | 794 | comedi_buf_write_free(async, sizeof(short)); |
ed9eccbe DS |
795 | return 1; |
796 | } | |
d58214b0 | 797 | EXPORT_SYMBOL(comedi_buf_put); |
ed9eccbe | 798 | |
d163679c | 799 | void comedi_reset_async_buf(struct comedi_async *async) |
ed9eccbe DS |
800 | { |
801 | async->buf_write_alloc_count = 0; | |
802 | async->buf_write_count = 0; | |
803 | async->buf_read_alloc_count = 0; | |
804 | async->buf_read_count = 0; | |
805 | ||
806 | async->buf_write_ptr = 0; | |
807 | async->buf_read_ptr = 0; | |
808 | ||
809 | async->cur_chan = 0; | |
810 | async->scan_progress = 0; | |
811 | async->munge_chan = 0; | |
812 | async->munge_count = 0; | |
813 | async->munge_ptr = 0; | |
814 | ||
815 | async->events = 0; | |
816 | } | |
817 | ||
f4011670 IA |
818 | static int |
819 | comedi_auto_config_helper(struct device *hardware_device, | |
820 | struct comedi_driver *driver, | |
821 | int (*attach_wrapper) (struct comedi_device *, | |
822 | void *), void *context) | |
823 | { | |
824 | int minor; | |
825 | struct comedi_device_file_info *dev_file_info; | |
826 | struct comedi_device *comedi_dev; | |
827 | int ret; | |
828 | ||
829 | if (!comedi_autoconfig) | |
830 | return 0; | |
831 | ||
832 | minor = comedi_alloc_board_minor(hardware_device); | |
833 | if (minor < 0) | |
834 | return minor; | |
835 | ||
836 | dev_file_info = comedi_get_device_file_info(minor); | |
837 | comedi_dev = dev_file_info->device; | |
838 | ||
839 | mutex_lock(&comedi_dev->mutex); | |
840 | if (comedi_dev->attached) | |
841 | ret = -EBUSY; | |
842 | else if (!try_module_get(driver->module)) { | |
843 | printk(KERN_INFO "comedi: failed to increment module count\n"); | |
844 | ret = -EIO; | |
845 | } else { | |
846 | /* set comedi_dev->driver here for attach wrapper */ | |
847 | comedi_dev->driver = driver; | |
848 | ret = (*attach_wrapper)(comedi_dev, context); | |
849 | if (ret < 0) { | |
850 | module_put(driver->module); | |
851 | __comedi_device_detach(comedi_dev); | |
852 | } else { | |
853 | ret = comedi_device_postconfig(comedi_dev); | |
854 | } | |
855 | } | |
856 | mutex_unlock(&comedi_dev->mutex); | |
857 | ||
858 | if (ret < 0) | |
859 | comedi_free_board_minor(minor); | |
860 | return ret; | |
861 | } | |
862 | ||
cf938c24 IA |
863 | static int comedi_auto_config_wrapper(struct comedi_device *dev, void *context) |
864 | { | |
865 | struct comedi_devconfig *it = context; | |
866 | struct comedi_driver *driv = dev->driver; | |
867 | ||
868 | if (driv->num_names) { | |
869 | /* look for generic board entry matching driver name, which | |
870 | * has already been copied to it->board_name */ | |
871 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
872 | if (dev->board_ptr == NULL) { | |
873 | printk(KERN_WARNING | |
874 | "comedi: auto config failed to find board entry" | |
875 | " '%s' for driver '%s'\n", it->board_name, | |
876 | driv->driver_name); | |
877 | comedi_report_boards(driv); | |
878 | return -EINVAL; | |
879 | } | |
880 | } | |
881 | return driv->attach(dev, it); | |
882 | } | |
883 | ||
7029a874 | 884 | static int comedi_auto_config(struct device *hardware_device, |
63bf3d11 | 885 | struct comedi_driver *driver, const int *options, |
7029a874 | 886 | unsigned num_options) |
ed9eccbe | 887 | { |
0707bb04 | 888 | struct comedi_devconfig it; |
ed9eccbe DS |
889 | |
890 | memset(&it, 0, sizeof(it)); | |
63bf3d11 | 891 | strncpy(it.board_name, driver->driver_name, COMEDI_NAMELEN); |
ed9eccbe DS |
892 | it.board_name[COMEDI_NAMELEN - 1] = '\0'; |
893 | BUG_ON(num_options > COMEDI_NDEVCONFOPTS); | |
894 | memcpy(it.options, options, num_options * sizeof(int)); | |
cf938c24 IA |
895 | return comedi_auto_config_helper(hardware_device, driver, |
896 | comedi_auto_config_wrapper, &it); | |
ed9eccbe DS |
897 | } |
898 | ||
7029a874 | 899 | static void comedi_auto_unconfig(struct device *hardware_device) |
ed9eccbe | 900 | { |
c43435d7 | 901 | int minor; |
ed9eccbe | 902 | |
c43435d7 IA |
903 | if (hardware_device == NULL) |
904 | return; | |
905 | minor = comedi_find_board_minor(hardware_device); | |
906 | if (minor < 0) | |
907 | return; | |
908 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
909 | comedi_free_board_minor(minor); | |
ed9eccbe DS |
910 | } |
911 | ||
f4011670 IA |
912 | static int comedi_old_pci_auto_config(struct pci_dev *pcidev, |
913 | struct comedi_driver *driver) | |
ed9eccbe DS |
914 | { |
915 | int options[2]; | |
916 | ||
b6c77757 | 917 | /* pci bus */ |
ed9eccbe | 918 | options[0] = pcidev->bus->number; |
b6c77757 | 919 | /* pci slot */ |
ed9eccbe DS |
920 | options[1] = PCI_SLOT(pcidev->devfn); |
921 | ||
63bf3d11 | 922 | return comedi_auto_config(&pcidev->dev, driver, |
8629efa4 | 923 | options, ARRAY_SIZE(options)); |
ed9eccbe | 924 | } |
f4011670 IA |
925 | |
926 | static int comedi_pci_attach_wrapper(struct comedi_device *dev, void *pcidev) | |
927 | { | |
928 | return dev->driver->attach_pci(dev, pcidev); | |
929 | } | |
930 | ||
931 | static int comedi_new_pci_auto_config(struct pci_dev *pcidev, | |
932 | struct comedi_driver *driver) | |
933 | { | |
934 | return comedi_auto_config_helper(&pcidev->dev, driver, | |
935 | comedi_pci_attach_wrapper, pcidev); | |
936 | } | |
937 | ||
938 | int comedi_pci_auto_config(struct pci_dev *pcidev, struct comedi_driver *driver) | |
939 | { | |
940 | ||
941 | if (driver->attach_pci) | |
942 | return comedi_new_pci_auto_config(pcidev, driver); | |
943 | else | |
944 | return comedi_old_pci_auto_config(pcidev, driver); | |
945 | } | |
4bf93559 | 946 | EXPORT_SYMBOL_GPL(comedi_pci_auto_config); |
ed9eccbe DS |
947 | |
948 | void comedi_pci_auto_unconfig(struct pci_dev *pcidev) | |
949 | { | |
950 | comedi_auto_unconfig(&pcidev->dev); | |
951 | } | |
4bf93559 | 952 | EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig); |
c28264da | 953 | |
d4899c6f HS |
954 | int comedi_pci_driver_register(struct comedi_driver *comedi_driver, |
955 | struct pci_driver *pci_driver) | |
956 | { | |
957 | int ret; | |
958 | ||
959 | ret = comedi_driver_register(comedi_driver); | |
960 | if (ret < 0) | |
961 | return ret; | |
962 | ||
963 | /* FIXME: Remove this test after auditing all comedi pci drivers */ | |
964 | if (!pci_driver->name) | |
965 | pci_driver->name = comedi_driver->driver_name; | |
966 | ||
967 | ret = pci_register_driver(pci_driver); | |
968 | if (ret < 0) { | |
969 | comedi_driver_unregister(comedi_driver); | |
970 | return ret; | |
971 | } | |
972 | ||
973 | return 0; | |
974 | } | |
975 | EXPORT_SYMBOL_GPL(comedi_pci_driver_register); | |
976 | ||
977 | void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver, | |
978 | struct pci_driver *pci_driver) | |
979 | { | |
980 | pci_unregister_driver(pci_driver); | |
981 | comedi_driver_unregister(comedi_driver); | |
982 | } | |
983 | EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister); | |
984 | ||
78b10615 RD |
985 | #if IS_ENABLED(CONFIG_USB) |
986 | ||
f4011670 IA |
987 | static int comedi_old_usb_auto_config(struct usb_interface *intf, |
988 | struct comedi_driver *driver) | |
989 | { | |
63bf3d11 | 990 | return comedi_auto_config(&intf->dev, driver, NULL, 0); |
f4011670 IA |
991 | } |
992 | ||
993 | static int comedi_usb_attach_wrapper(struct comedi_device *dev, void *intf) | |
994 | { | |
995 | return dev->driver->attach_usb(dev, intf); | |
996 | } | |
997 | ||
998 | static int comedi_new_usb_auto_config(struct usb_interface *intf, | |
999 | struct comedi_driver *driver) | |
1000 | { | |
1001 | return comedi_auto_config_helper(&intf->dev, driver, | |
1002 | comedi_usb_attach_wrapper, intf); | |
1003 | } | |
1004 | ||
d8b6ca08 | 1005 | int comedi_usb_auto_config(struct usb_interface *intf, |
4c093a6d | 1006 | struct comedi_driver *driver) |
c28264da | 1007 | { |
d8b6ca08 | 1008 | BUG_ON(intf == NULL); |
f4011670 IA |
1009 | if (driver->attach_usb) |
1010 | return comedi_new_usb_auto_config(intf, driver); | |
1011 | else | |
1012 | return comedi_old_usb_auto_config(intf, driver); | |
c28264da | 1013 | } |
4bf93559 | 1014 | EXPORT_SYMBOL_GPL(comedi_usb_auto_config); |
c28264da | 1015 | |
d8b6ca08 | 1016 | void comedi_usb_auto_unconfig(struct usb_interface *intf) |
c28264da | 1017 | { |
d8b6ca08 IA |
1018 | BUG_ON(intf == NULL); |
1019 | comedi_auto_unconfig(&intf->dev); | |
c28264da | 1020 | } |
4bf93559 | 1021 | EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig); |
64255031 HS |
1022 | |
1023 | int comedi_usb_driver_register(struct comedi_driver *comedi_driver, | |
1024 | struct usb_driver *usb_driver) | |
1025 | { | |
1026 | int ret; | |
1027 | ||
1028 | ret = comedi_driver_register(comedi_driver); | |
1029 | if (ret < 0) | |
1030 | return ret; | |
1031 | ||
1032 | ret = usb_register(usb_driver); | |
1033 | if (ret < 0) { | |
1034 | comedi_driver_unregister(comedi_driver); | |
1035 | return ret; | |
1036 | } | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | EXPORT_SYMBOL_GPL(comedi_usb_driver_register); | |
1041 | ||
1042 | void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver, | |
1043 | struct usb_driver *usb_driver) | |
1044 | { | |
1045 | usb_deregister(usb_driver); | |
1046 | comedi_driver_unregister(comedi_driver); | |
1047 | } | |
1048 | EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister); | |
78b10615 RD |
1049 | |
1050 | #endif |