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 DS |
32 | #include <linux/errno.h> |
33 | #include <linux/kernel.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/ioport.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/slab.h> | |
40 | #include "comedidev.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> | |
45 | ||
5617f9da | 46 | #include <linux/io.h> |
ed9eccbe DS |
47 | #include <asm/system.h> |
48 | ||
71b5f4f1 | 49 | static int postconfig(struct comedi_device *dev); |
0a85b6f0 MT |
50 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
51 | struct comedi_subdevice *s, | |
52 | struct comedi_insn *insn, unsigned int *data); | |
53 | static void *comedi_recognize(struct comedi_driver *driv, const char *name); | |
139dfbdf | 54 | static void comedi_report_boards(struct comedi_driver *driv); |
34c43922 BP |
55 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s); |
56 | int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, | |
0a85b6f0 | 57 | unsigned long new_size); |
ed9eccbe | 58 | |
139dfbdf | 59 | struct comedi_driver *comedi_drivers; |
ed9eccbe DS |
60 | |
61 | int comedi_modprobe(int minor) | |
62 | { | |
63 | return -EINVAL; | |
64 | } | |
65 | ||
71b5f4f1 | 66 | static void cleanup_device(struct comedi_device *dev) |
ed9eccbe DS |
67 | { |
68 | int i; | |
34c43922 | 69 | struct comedi_subdevice *s; |
ed9eccbe DS |
70 | |
71 | if (dev->subdevices) { | |
72 | for (i = 0; i < dev->n_subdevices; i++) { | |
73 | s = dev->subdevices + i; | |
74 | comedi_free_subdevice_minor(s); | |
75 | if (s->async) { | |
76 | comedi_buf_alloc(dev, s, 0); | |
77 | kfree(s->async); | |
78 | } | |
79 | } | |
80 | kfree(dev->subdevices); | |
81 | dev->subdevices = NULL; | |
82 | dev->n_subdevices = 0; | |
83 | } | |
dedd1325 BP |
84 | kfree(dev->private); |
85 | dev->private = NULL; | |
ed9eccbe DS |
86 | dev->driver = 0; |
87 | dev->board_name = NULL; | |
88 | dev->board_ptr = NULL; | |
89 | dev->iobase = 0; | |
90 | dev->irq = 0; | |
91 | dev->read_subdev = NULL; | |
92 | dev->write_subdev = NULL; | |
93 | dev->open = NULL; | |
94 | dev->close = NULL; | |
95 | comedi_set_hw_dev(dev, NULL); | |
96 | } | |
97 | ||
71b5f4f1 | 98 | static void __comedi_device_detach(struct comedi_device *dev) |
ed9eccbe DS |
99 | { |
100 | dev->attached = 0; | |
5617f9da | 101 | if (dev->driver) |
ed9eccbe | 102 | dev->driver->detach(dev); |
5617f9da | 103 | else |
ac4898a0 | 104 | printk(KERN_WARNING "BUG: dev->driver=NULL in comedi_device_detach()\n"); |
ed9eccbe DS |
105 | cleanup_device(dev); |
106 | } | |
107 | ||
71b5f4f1 | 108 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe DS |
109 | { |
110 | if (!dev->attached) | |
111 | return; | |
112 | __comedi_device_detach(dev); | |
113 | } | |
114 | ||
0707bb04 | 115 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 116 | { |
139dfbdf | 117 | struct comedi_driver *driv; |
ed9eccbe DS |
118 | int ret; |
119 | ||
120 | if (dev->attached) | |
121 | return -EBUSY; | |
122 | ||
123 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
124 | if (!try_module_get(driv->module)) { | |
0a85b6f0 | 125 | printk |
ac4898a0 | 126 | (KERN_INFO "comedi: failed to increment module count, skipping\n"); |
ed9eccbe DS |
127 | continue; |
128 | } | |
129 | if (driv->num_names) { | |
130 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
131 | if (dev->board_ptr == NULL) { | |
132 | module_put(driv->module); | |
133 | continue; | |
134 | } | |
135 | } else { | |
136 | if (strcmp(driv->driver_name, it->board_name)) { | |
137 | module_put(driv->module); | |
138 | continue; | |
139 | } | |
140 | } | |
ac4898a0 ZR |
141 | /* initialize dev->driver here so |
142 | * comedi_error() can be called from attach */ | |
ed9eccbe DS |
143 | dev->driver = driv; |
144 | ret = driv->attach(dev, it); | |
145 | if (ret < 0) { | |
146 | module_put(dev->driver->module); | |
147 | __comedi_device_detach(dev); | |
148 | return ret; | |
149 | } | |
150 | goto attached; | |
151 | } | |
152 | ||
b6c77757 BP |
153 | /* recognize has failed if we get here */ |
154 | /* report valid board names before returning error */ | |
ed9eccbe DS |
155 | for (driv = comedi_drivers; driv; driv = driv->next) { |
156 | if (!try_module_get(driv->module)) { | |
ac4898a0 | 157 | printk(KERN_INFO "comedi: failed to increment module count\n"); |
ed9eccbe DS |
158 | continue; |
159 | } | |
160 | comedi_report_boards(driv); | |
161 | module_put(driv->module); | |
162 | } | |
163 | return -EIO; | |
164 | ||
165 | attached: | |
166 | /* do a little post-config cleanup */ | |
167 | ret = postconfig(dev); | |
168 | module_put(dev->driver->module); | |
169 | if (ret < 0) { | |
170 | __comedi_device_detach(dev); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | if (!dev->board_name) { | |
ac4898a0 | 175 | printk(KERN_WARNING "BUG: dev->board_name=<%p>\n", dev->board_name); |
ed9eccbe DS |
176 | dev->board_name = "BUG"; |
177 | } | |
178 | smp_wmb(); | |
179 | dev->attached = 1; | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
139dfbdf | 184 | int comedi_driver_register(struct comedi_driver *driver) |
ed9eccbe DS |
185 | { |
186 | driver->next = comedi_drivers; | |
187 | comedi_drivers = driver; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
139dfbdf | 192 | int comedi_driver_unregister(struct comedi_driver *driver) |
ed9eccbe | 193 | { |
139dfbdf | 194 | struct comedi_driver *prev; |
ed9eccbe DS |
195 | int i; |
196 | ||
197 | /* check for devices using this driver */ | |
198 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
0a85b6f0 MT |
199 | struct comedi_device_file_info *dev_file_info = |
200 | comedi_get_device_file_info(i); | |
71b5f4f1 | 201 | struct comedi_device *dev; |
ed9eccbe | 202 | |
0a85b6f0 MT |
203 | if (dev_file_info == NULL) |
204 | continue; | |
ed9eccbe DS |
205 | dev = dev_file_info->device; |
206 | ||
207 | mutex_lock(&dev->mutex); | |
208 | if (dev->attached && dev->driver == driver) { | |
209 | if (dev->use_count) | |
0a85b6f0 | 210 | printk |
ac4898a0 | 211 | (KERN_WARNING "BUG! detaching device with use_count=%d\n", |
0a85b6f0 | 212 | dev->use_count); |
ed9eccbe DS |
213 | comedi_device_detach(dev); |
214 | } | |
215 | mutex_unlock(&dev->mutex); | |
216 | } | |
217 | ||
218 | if (comedi_drivers == driver) { | |
219 | comedi_drivers = driver->next; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
224 | if (prev->next == driver) { | |
225 | prev->next = driver->next; | |
226 | return 0; | |
227 | } | |
228 | } | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
71b5f4f1 | 232 | static int postconfig(struct comedi_device *dev) |
ed9eccbe DS |
233 | { |
234 | int i; | |
34c43922 | 235 | struct comedi_subdevice *s; |
d163679c | 236 | struct comedi_async *async = NULL; |
ed9eccbe DS |
237 | int ret; |
238 | ||
239 | for (i = 0; i < dev->n_subdevices; i++) { | |
240 | s = dev->subdevices + i; | |
241 | ||
242 | if (s->type == COMEDI_SUBD_UNUSED) | |
243 | continue; | |
244 | ||
245 | if (s->len_chanlist == 0) | |
246 | s->len_chanlist = 1; | |
247 | ||
248 | if (s->do_cmd) { | |
249 | BUG_ON((s->subdev_flags & (SDF_CMD_READ | | |
0a85b6f0 | 250 | SDF_CMD_WRITE)) == 0); |
ed9eccbe DS |
251 | BUG_ON(!s->do_cmdtest); |
252 | ||
0a85b6f0 MT |
253 | async = |
254 | kzalloc(sizeof(struct comedi_async), GFP_KERNEL); | |
ed9eccbe | 255 | if (async == NULL) { |
ac4898a0 | 256 | printk(KERN_INFO "failed to allocate async struct\n"); |
ed9eccbe DS |
257 | return -ENOMEM; |
258 | } | |
259 | init_waitqueue_head(&async->wait_head); | |
260 | async->subdevice = s; | |
261 | s->async = async; | |
262 | ||
263 | #define DEFAULT_BUF_MAXSIZE (64*1024) | |
264 | #define DEFAULT_BUF_SIZE (64*1024) | |
265 | ||
266 | async->max_bufsize = DEFAULT_BUF_MAXSIZE; | |
267 | ||
268 | async->prealloc_buf = NULL; | |
269 | async->prealloc_bufsz = 0; | |
270 | if (comedi_buf_alloc(dev, s, DEFAULT_BUF_SIZE) < 0) { | |
ac4898a0 | 271 | printk(KERN_INFO "Buffer allocation failed\n"); |
ed9eccbe DS |
272 | return -ENOMEM; |
273 | } | |
274 | if (s->buf_change) { | |
275 | ret = s->buf_change(dev, s, DEFAULT_BUF_SIZE); | |
276 | if (ret < 0) | |
277 | return ret; | |
278 | } | |
279 | comedi_alloc_subdevice_minor(dev, s); | |
280 | } | |
281 | ||
282 | if (!s->range_table && !s->range_table_list) | |
283 | s->range_table = &range_unknown; | |
284 | ||
285 | if (!s->insn_read && s->insn_bits) | |
286 | s->insn_read = insn_rw_emulate_bits; | |
287 | if (!s->insn_write && s->insn_bits) | |
288 | s->insn_write = insn_rw_emulate_bits; | |
289 | ||
290 | if (!s->insn_read) | |
291 | s->insn_read = insn_inval; | |
292 | if (!s->insn_write) | |
293 | s->insn_write = insn_inval; | |
294 | if (!s->insn_bits) | |
295 | s->insn_bits = insn_inval; | |
296 | if (!s->insn_config) | |
297 | s->insn_config = insn_inval; | |
298 | ||
299 | if (!s->poll) | |
300 | s->poll = poll_invalid; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
ac4898a0 ZR |
306 | /* generic recognize function for drivers |
307 | * that register their supported board names */ | |
0a85b6f0 | 308 | void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe DS |
309 | { |
310 | unsigned i; | |
311 | const char *const *name_ptr = driv->board_name; | |
312 | for (i = 0; i < driv->num_names; i++) { | |
313 | if (strcmp(*name_ptr, name) == 0) | |
314 | return (void *)name_ptr; | |
315 | name_ptr = | |
0a85b6f0 MT |
316 | (const char *const *)((const char *)name_ptr + |
317 | driv->offset); | |
ed9eccbe DS |
318 | } |
319 | ||
320 | return NULL; | |
321 | } | |
322 | ||
139dfbdf | 323 | void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
324 | { |
325 | unsigned int i; | |
326 | const char *const *name_ptr; | |
327 | ||
ac4898a0 | 328 | printk(KERN_INFO "comedi: valid board names for %s driver are:\n", |
0a85b6f0 | 329 | driv->driver_name); |
ed9eccbe DS |
330 | |
331 | name_ptr = driv->board_name; | |
332 | for (i = 0; i < driv->num_names; i++) { | |
ac4898a0 | 333 | printk(KERN_INFO " %s\n", *name_ptr); |
ed9eccbe DS |
334 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
335 | } | |
336 | ||
337 | if (driv->num_names == 0) | |
ac4898a0 | 338 | printk(KERN_INFO " %s\n", driv->driver_name); |
ed9eccbe DS |
339 | } |
340 | ||
34c43922 | 341 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
342 | { |
343 | return -EINVAL; | |
344 | } | |
345 | ||
34c43922 | 346 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
0a85b6f0 | 347 | struct comedi_insn *insn, unsigned int *data) |
ed9eccbe DS |
348 | { |
349 | return -EINVAL; | |
350 | } | |
351 | ||
0a85b6f0 MT |
352 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
353 | struct comedi_subdevice *s, | |
354 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 355 | { |
90035c08 | 356 | struct comedi_insn new_insn; |
ed9eccbe DS |
357 | int ret; |
358 | static const unsigned channels_per_bitfield = 32; | |
359 | ||
360 | unsigned chan = CR_CHAN(insn->chanspec); | |
361 | const unsigned base_bitfield_channel = | |
0a85b6f0 | 362 | (chan < channels_per_bitfield) ? 0 : chan; |
790c5541 | 363 | unsigned int new_data[2]; |
ed9eccbe DS |
364 | memset(new_data, 0, sizeof(new_data)); |
365 | memset(&new_insn, 0, sizeof(new_insn)); | |
366 | new_insn.insn = INSN_BITS; | |
367 | new_insn.chanspec = base_bitfield_channel; | |
368 | new_insn.n = 2; | |
369 | new_insn.data = new_data; | |
370 | new_insn.subdev = insn->subdev; | |
371 | ||
372 | if (insn->insn == INSN_WRITE) { | |
373 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
374 | return -EINVAL; | |
375 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ | |
376 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) : 0; /* bits */ | |
377 | } | |
378 | ||
379 | ret = s->insn_bits(dev, s, &new_insn, new_data); | |
380 | if (ret < 0) | |
381 | return ret; | |
382 | ||
5617f9da | 383 | if (insn->insn == INSN_READ) |
ed9eccbe | 384 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; |
ed9eccbe DS |
385 | |
386 | return 1; | |
387 | } | |
388 | ||
d43d27ab | 389 | static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) |
ed9eccbe DS |
390 | { |
391 | unsigned long ret = 0UL; | |
392 | pmd_t *pmd; | |
393 | pte_t *ptep, pte; | |
394 | pud_t *pud; | |
395 | ||
396 | if (!pgd_none(*pgd)) { | |
397 | pud = pud_offset(pgd, adr); | |
398 | pmd = pmd_offset(pud, adr); | |
399 | if (!pmd_none(*pmd)) { | |
400 | ptep = pte_offset_kernel(pmd, adr); | |
401 | pte = *ptep; | |
402 | if (pte_present(pte)) { | |
403 | ret = (unsigned long) | |
0a85b6f0 | 404 | page_address(pte_page(pte)); |
ed9eccbe DS |
405 | ret |= (adr & (PAGE_SIZE - 1)); |
406 | } | |
407 | } | |
408 | } | |
409 | return ret; | |
410 | } | |
411 | ||
412 | static inline unsigned long kvirt_to_kva(unsigned long adr) | |
413 | { | |
414 | unsigned long va, kva; | |
415 | ||
416 | va = adr; | |
417 | kva = uvirt_to_kva(pgd_offset_k(va), va); | |
418 | ||
419 | return kva; | |
420 | } | |
421 | ||
34c43922 | 422 | int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, |
0a85b6f0 | 423 | unsigned long new_size) |
ed9eccbe | 424 | { |
d163679c | 425 | struct comedi_async *async = s->async; |
ed9eccbe DS |
426 | |
427 | /* Round up new_size to multiple of PAGE_SIZE */ | |
428 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
429 | ||
430 | /* if no change is required, do nothing */ | |
5617f9da | 431 | if (async->prealloc_buf && async->prealloc_bufsz == new_size) |
ed9eccbe | 432 | return 0; |
5617f9da | 433 | |
b6c77757 | 434 | /* deallocate old buffer */ |
ed9eccbe DS |
435 | if (async->prealloc_buf) { |
436 | vunmap(async->prealloc_buf); | |
437 | async->prealloc_buf = NULL; | |
438 | async->prealloc_bufsz = 0; | |
439 | } | |
440 | if (async->buf_page_list) { | |
441 | unsigned i; | |
442 | for (i = 0; i < async->n_buf_pages; ++i) { | |
443 | if (async->buf_page_list[i].virt_addr) { | |
be29eac8 | 444 | clear_bit(PG_reserved, &(virt_to_page(async->buf_page_list[i].virt_addr)->flags)); |
ed9eccbe DS |
445 | if (s->async_dma_dir != DMA_NONE) { |
446 | dma_free_coherent(dev->hw_dev, | |
0a85b6f0 MT |
447 | PAGE_SIZE, |
448 | async-> | |
449 | buf_page_list | |
450 | [i].virt_addr, | |
451 | async-> | |
452 | buf_page_list | |
453 | [i].dma_addr); | |
ed9eccbe | 454 | } else { |
0a85b6f0 MT |
455 | free_page((unsigned long) |
456 | async->buf_page_list[i]. | |
457 | virt_addr); | |
ed9eccbe DS |
458 | } |
459 | } | |
460 | } | |
461 | vfree(async->buf_page_list); | |
462 | async->buf_page_list = NULL; | |
463 | async->n_buf_pages = 0; | |
464 | } | |
b6c77757 | 465 | /* allocate new buffer */ |
ed9eccbe DS |
466 | if (new_size) { |
467 | unsigned i = 0; | |
468 | unsigned n_pages = new_size >> PAGE_SHIFT; | |
469 | struct page **pages = NULL; | |
470 | ||
471 | async->buf_page_list = | |
0a85b6f0 | 472 | vmalloc(sizeof(struct comedi_buf_page) * n_pages); |
ed9eccbe DS |
473 | if (async->buf_page_list) { |
474 | memset(async->buf_page_list, 0, | |
0a85b6f0 | 475 | sizeof(struct comedi_buf_page) * n_pages); |
ed9eccbe DS |
476 | pages = vmalloc(sizeof(struct page *) * n_pages); |
477 | } | |
478 | if (pages) { | |
479 | for (i = 0; i < n_pages; i++) { | |
480 | if (s->async_dma_dir != DMA_NONE) { | |
481 | async->buf_page_list[i].virt_addr = | |
0a85b6f0 MT |
482 | dma_alloc_coherent(dev->hw_dev, |
483 | PAGE_SIZE, | |
484 | &async-> | |
485 | buf_page_list | |
486 | [i].dma_addr, | |
487 | GFP_KERNEL | | |
488 | __GFP_COMP); | |
ed9eccbe DS |
489 | } else { |
490 | async->buf_page_list[i].virt_addr = | |
0a85b6f0 MT |
491 | (void *) |
492 | get_zeroed_page(GFP_KERNEL); | |
ed9eccbe | 493 | } |
5617f9da | 494 | if (async->buf_page_list[i].virt_addr == NULL) |
ed9eccbe | 495 | break; |
5617f9da | 496 | |
be29eac8 GKH |
497 | set_bit(PG_reserved, |
498 | &(virt_to_page(async->buf_page_list[i].virt_addr)->flags)); | |
499 | pages[i] = virt_to_page(async->buf_page_list[i].virt_addr); | |
ed9eccbe DS |
500 | } |
501 | } | |
502 | if (i == n_pages) { | |
503 | async->prealloc_buf = | |
0a85b6f0 | 504 | vmap(pages, n_pages, VM_MAP, PAGE_KERNEL_NOCACHE); |
ed9eccbe | 505 | } |
b455073c F |
506 | vfree(pages); |
507 | ||
ed9eccbe DS |
508 | if (async->prealloc_buf == NULL) { |
509 | /* Some allocation failed above. */ | |
510 | if (async->buf_page_list) { | |
511 | for (i = 0; i < n_pages; i++) { | |
512 | if (async->buf_page_list[i].virt_addr == | |
0a85b6f0 | 513 | NULL) { |
ed9eccbe DS |
514 | break; |
515 | } | |
be29eac8 | 516 | clear_bit(PG_reserved, &(virt_to_page(async->buf_page_list[i].virt_addr)->flags)); |
ed9eccbe DS |
517 | if (s->async_dma_dir != DMA_NONE) { |
518 | dma_free_coherent(dev->hw_dev, | |
0a85b6f0 MT |
519 | PAGE_SIZE, |
520 | async-> | |
521 | buf_page_list | |
522 | [i].virt_addr, | |
523 | async-> | |
524 | buf_page_list | |
525 | [i].dma_addr); | |
ed9eccbe | 526 | } else { |
0a85b6f0 MT |
527 | free_page((unsigned long) |
528 | async->buf_page_list | |
529 | [i].virt_addr); | |
ed9eccbe DS |
530 | } |
531 | } | |
532 | vfree(async->buf_page_list); | |
533 | async->buf_page_list = NULL; | |
534 | } | |
535 | return -ENOMEM; | |
536 | } | |
537 | async->n_buf_pages = n_pages; | |
538 | } | |
539 | async->prealloc_bufsz = new_size; | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | /* munging is applied to data by core as it passes between user | |
545 | * and kernel space */ | |
0a85b6f0 MT |
546 | unsigned int comedi_buf_munge(struct comedi_async *async, |
547 | unsigned int num_bytes) | |
ed9eccbe | 548 | { |
34c43922 | 549 | struct comedi_subdevice *s = async->subdevice; |
ed9eccbe DS |
550 | unsigned int count = 0; |
551 | const unsigned num_sample_bytes = bytes_per_sample(s); | |
552 | ||
553 | if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { | |
554 | async->munge_count += num_bytes; | |
2961f24f | 555 | BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); |
ed9eccbe DS |
556 | return num_bytes; |
557 | } | |
558 | /* don't munge partial samples */ | |
559 | num_bytes -= num_bytes % num_sample_bytes; | |
560 | while (count < num_bytes) { | |
561 | int block_size; | |
562 | ||
563 | block_size = num_bytes - count; | |
564 | if (block_size < 0) { | |
ac4898a0 | 565 | printk(KERN_WARNING "%s: %s: bug! block_size is negative\n", |
0a85b6f0 | 566 | __FILE__, __func__); |
ed9eccbe DS |
567 | break; |
568 | } | |
569 | if ((int)(async->munge_ptr + block_size - | |
0a85b6f0 | 570 | async->prealloc_bufsz) > 0) |
ed9eccbe DS |
571 | block_size = async->prealloc_bufsz - async->munge_ptr; |
572 | ||
573 | s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, | |
0a85b6f0 | 574 | block_size, async->munge_chan); |
ed9eccbe | 575 | |
ac4898a0 ZR |
576 | smp_wmb(); /* barrier insures data is munged in buffer |
577 | * before munge_count is incremented */ | |
ed9eccbe DS |
578 | |
579 | async->munge_chan += block_size / num_sample_bytes; | |
580 | async->munge_chan %= async->cmd.chanlist_len; | |
581 | async->munge_count += block_size; | |
582 | async->munge_ptr += block_size; | |
583 | async->munge_ptr %= async->prealloc_bufsz; | |
584 | count += block_size; | |
585 | } | |
2961f24f | 586 | BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); |
ed9eccbe DS |
587 | return count; |
588 | } | |
589 | ||
d163679c | 590 | unsigned int comedi_buf_write_n_available(struct comedi_async *async) |
ed9eccbe DS |
591 | { |
592 | unsigned int free_end; | |
593 | unsigned int nbytes; | |
594 | ||
595 | if (async == NULL) | |
596 | return 0; | |
597 | ||
598 | free_end = async->buf_read_count + async->prealloc_bufsz; | |
599 | nbytes = free_end - async->buf_write_alloc_count; | |
600 | nbytes -= nbytes % bytes_per_sample(async->subdevice); | |
601 | /* barrier insures the read of buf_read_count in this | |
602 | query occurs before any following writes to the buffer which | |
603 | might be based on the return value from this query. | |
604 | */ | |
605 | smp_mb(); | |
606 | return nbytes; | |
607 | } | |
608 | ||
609 | /* allocates chunk for the writer from free buffer space */ | |
0a85b6f0 MT |
610 | unsigned int comedi_buf_write_alloc(struct comedi_async *async, |
611 | unsigned int nbytes) | |
ed9eccbe DS |
612 | { |
613 | unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; | |
614 | ||
5617f9da | 615 | if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) |
ed9eccbe | 616 | nbytes = free_end - async->buf_write_alloc_count; |
5617f9da | 617 | |
ed9eccbe DS |
618 | async->buf_write_alloc_count += nbytes; |
619 | /* barrier insures the read of buf_read_count above occurs before | |
620 | we write data to the write-alloc'ed buffer space */ | |
621 | smp_mb(); | |
622 | return nbytes; | |
623 | } | |
624 | ||
625 | /* allocates nothing unless it can completely fulfill the request */ | |
d163679c | 626 | unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async, |
0a85b6f0 | 627 | unsigned int nbytes) |
ed9eccbe DS |
628 | { |
629 | unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; | |
630 | ||
5617f9da | 631 | if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) |
ed9eccbe | 632 | nbytes = 0; |
5617f9da | 633 | |
ed9eccbe DS |
634 | async->buf_write_alloc_count += nbytes; |
635 | /* barrier insures the read of buf_read_count above occurs before | |
636 | we write data to the write-alloc'ed buffer space */ | |
637 | smp_mb(); | |
638 | return nbytes; | |
639 | } | |
640 | ||
641 | /* transfers a chunk from writer to filled buffer space */ | |
d163679c | 642 | unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe DS |
643 | { |
644 | if ((int)(async->buf_write_count + nbytes - | |
0a85b6f0 MT |
645 | async->buf_write_alloc_count) > 0) { |
646 | printk | |
ac4898a0 | 647 | (KERN_INFO "comedi: attempted to write-free more bytes than have been write-allocated.\n"); |
ed9eccbe DS |
648 | nbytes = async->buf_write_alloc_count - async->buf_write_count; |
649 | } | |
650 | async->buf_write_count += nbytes; | |
651 | async->buf_write_ptr += nbytes; | |
652 | comedi_buf_munge(async, async->buf_write_count - async->munge_count); | |
5617f9da | 653 | if (async->buf_write_ptr >= async->prealloc_bufsz) |
ed9eccbe | 654 | async->buf_write_ptr %= async->prealloc_bufsz; |
5617f9da | 655 | |
ed9eccbe DS |
656 | return nbytes; |
657 | } | |
658 | ||
659 | /* allocates a chunk for the reader from filled (and munged) buffer space */ | |
d163679c | 660 | unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes) |
ed9eccbe DS |
661 | { |
662 | if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > | |
0a85b6f0 | 663 | 0) { |
ed9eccbe DS |
664 | nbytes = async->munge_count - async->buf_read_alloc_count; |
665 | } | |
666 | async->buf_read_alloc_count += nbytes; | |
667 | /* barrier insures read of munge_count occurs before we actually read | |
668 | data out of buffer */ | |
669 | smp_rmb(); | |
670 | return nbytes; | |
671 | } | |
672 | ||
673 | /* transfers control of a chunk from reader to free buffer space */ | |
d163679c | 674 | unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe | 675 | { |
ac4898a0 ZR |
676 | /* barrier insures data has been read out of |
677 | * buffer before read count is incremented */ | |
ed9eccbe DS |
678 | smp_mb(); |
679 | if ((int)(async->buf_read_count + nbytes - | |
0a85b6f0 MT |
680 | async->buf_read_alloc_count) > 0) { |
681 | printk | |
682 | ("comedi: attempted to read-free more bytes than have been read-allocated.\n"); | |
ed9eccbe DS |
683 | nbytes = async->buf_read_alloc_count - async->buf_read_count; |
684 | } | |
685 | async->buf_read_count += nbytes; | |
686 | async->buf_read_ptr += nbytes; | |
687 | async->buf_read_ptr %= async->prealloc_bufsz; | |
688 | return nbytes; | |
689 | } | |
690 | ||
d163679c | 691 | void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset, |
0a85b6f0 | 692 | const void *data, unsigned int num_bytes) |
ed9eccbe DS |
693 | { |
694 | unsigned int write_ptr = async->buf_write_ptr + offset; | |
695 | ||
696 | if (write_ptr >= async->prealloc_bufsz) | |
697 | write_ptr %= async->prealloc_bufsz; | |
698 | ||
699 | while (num_bytes) { | |
700 | unsigned int block_size; | |
701 | ||
702 | if (write_ptr + num_bytes > async->prealloc_bufsz) | |
703 | block_size = async->prealloc_bufsz - write_ptr; | |
704 | else | |
705 | block_size = num_bytes; | |
706 | ||
707 | memcpy(async->prealloc_buf + write_ptr, data, block_size); | |
708 | ||
709 | data += block_size; | |
710 | num_bytes -= block_size; | |
711 | ||
712 | write_ptr = 0; | |
713 | } | |
714 | } | |
715 | ||
d163679c | 716 | void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset, |
0a85b6f0 | 717 | void *dest, unsigned int nbytes) |
ed9eccbe DS |
718 | { |
719 | void *src; | |
720 | unsigned int read_ptr = async->buf_read_ptr + offset; | |
721 | ||
722 | if (read_ptr >= async->prealloc_bufsz) | |
723 | read_ptr %= async->prealloc_bufsz; | |
724 | ||
725 | while (nbytes) { | |
726 | unsigned int block_size; | |
727 | ||
728 | src = async->prealloc_buf + read_ptr; | |
729 | ||
730 | if (nbytes >= async->prealloc_bufsz - read_ptr) | |
731 | block_size = async->prealloc_bufsz - read_ptr; | |
732 | else | |
733 | block_size = nbytes; | |
734 | ||
735 | memcpy(dest, src, block_size); | |
736 | nbytes -= block_size; | |
737 | dest += block_size; | |
738 | read_ptr = 0; | |
739 | } | |
740 | } | |
741 | ||
d163679c | 742 | unsigned int comedi_buf_read_n_available(struct comedi_async *async) |
ed9eccbe DS |
743 | { |
744 | unsigned num_bytes; | |
745 | ||
746 | if (async == NULL) | |
747 | return 0; | |
748 | num_bytes = async->munge_count - async->buf_read_count; | |
749 | /* barrier insures the read of munge_count in this | |
750 | query occurs before any following reads of the buffer which | |
751 | might be based on the return value from this query. | |
752 | */ | |
753 | smp_rmb(); | |
754 | return num_bytes; | |
755 | } | |
756 | ||
d163679c | 757 | int comedi_buf_get(struct comedi_async *async, short *x) |
ed9eccbe DS |
758 | { |
759 | unsigned int n = comedi_buf_read_n_available(async); | |
760 | ||
790c5541 | 761 | if (n < sizeof(short)) |
ed9eccbe | 762 | return 0; |
790c5541 | 763 | comedi_buf_read_alloc(async, sizeof(short)); |
0a85b6f0 | 764 | *x = *(short *)(async->prealloc_buf + async->buf_read_ptr); |
790c5541 | 765 | comedi_buf_read_free(async, sizeof(short)); |
ed9eccbe DS |
766 | return 1; |
767 | } | |
768 | ||
d163679c | 769 | int comedi_buf_put(struct comedi_async *async, short x) |
ed9eccbe | 770 | { |
790c5541 | 771 | unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short)); |
ed9eccbe | 772 | |
790c5541 | 773 | if (n < sizeof(short)) { |
ed9eccbe DS |
774 | async->events |= COMEDI_CB_ERROR; |
775 | return 0; | |
776 | } | |
0a85b6f0 | 777 | *(short *)(async->prealloc_buf + async->buf_write_ptr) = x; |
790c5541 | 778 | comedi_buf_write_free(async, sizeof(short)); |
ed9eccbe DS |
779 | return 1; |
780 | } | |
781 | ||
d163679c | 782 | void comedi_reset_async_buf(struct comedi_async *async) |
ed9eccbe DS |
783 | { |
784 | async->buf_write_alloc_count = 0; | |
785 | async->buf_write_count = 0; | |
786 | async->buf_read_alloc_count = 0; | |
787 | async->buf_read_count = 0; | |
788 | ||
789 | async->buf_write_ptr = 0; | |
790 | async->buf_read_ptr = 0; | |
791 | ||
792 | async->cur_chan = 0; | |
793 | async->scan_progress = 0; | |
794 | async->munge_chan = 0; | |
795 | async->munge_count = 0; | |
796 | async->munge_ptr = 0; | |
797 | ||
798 | async->events = 0; | |
799 | } | |
800 | ||
0a85b6f0 MT |
801 | int comedi_auto_config(struct device *hardware_device, const char *board_name, |
802 | const int *options, unsigned num_options) | |
ed9eccbe | 803 | { |
0707bb04 | 804 | struct comedi_devconfig it; |
ed9eccbe DS |
805 | int minor; |
806 | struct comedi_device_file_info *dev_file_info; | |
807 | int retval; | |
c28264da | 808 | unsigned *private_data = NULL; |
ed9eccbe | 809 | |
719548ef IA |
810 | if (!comedi_autoconfig) { |
811 | dev_set_drvdata(hardware_device, NULL); | |
812 | return 0; | |
813 | } | |
6a9d7a21 | 814 | |
ed9eccbe | 815 | minor = comedi_alloc_board_minor(hardware_device); |
0a85b6f0 MT |
816 | if (minor < 0) |
817 | return minor; | |
c28264da BP |
818 | |
819 | private_data = kmalloc(sizeof(unsigned), GFP_KERNEL); | |
820 | if (private_data == NULL) { | |
821 | retval = -ENOMEM; | |
822 | goto cleanup; | |
823 | } | |
824 | *private_data = minor; | |
825 | dev_set_drvdata(hardware_device, private_data); | |
ed9eccbe DS |
826 | |
827 | dev_file_info = comedi_get_device_file_info(minor); | |
828 | ||
829 | memset(&it, 0, sizeof(it)); | |
830 | strncpy(it.board_name, board_name, COMEDI_NAMELEN); | |
831 | it.board_name[COMEDI_NAMELEN - 1] = '\0'; | |
832 | BUG_ON(num_options > COMEDI_NDEVCONFOPTS); | |
833 | memcpy(it.options, options, num_options * sizeof(int)); | |
834 | ||
835 | mutex_lock(&dev_file_info->device->mutex); | |
836 | retval = comedi_device_attach(dev_file_info->device, &it); | |
837 | mutex_unlock(&dev_file_info->device->mutex); | |
c28264da BP |
838 | |
839 | cleanup: | |
0a85b6f0 | 840 | if (retval < 0) { |
c28264da | 841 | kfree(private_data); |
ed9eccbe DS |
842 | comedi_free_board_minor(minor); |
843 | } | |
844 | return retval; | |
845 | } | |
846 | ||
847 | void comedi_auto_unconfig(struct device *hardware_device) | |
848 | { | |
c28264da | 849 | unsigned *minor = (unsigned *)dev_get_drvdata(hardware_device); |
0a85b6f0 MT |
850 | if (minor == NULL) |
851 | return; | |
ed9eccbe | 852 | |
c28264da | 853 | BUG_ON(*minor >= COMEDI_NUM_BOARD_MINORS); |
ed9eccbe | 854 | |
c28264da BP |
855 | comedi_free_board_minor(*minor); |
856 | dev_set_drvdata(hardware_device, NULL); | |
857 | kfree(minor); | |
ed9eccbe DS |
858 | } |
859 | ||
860 | int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) | |
861 | { | |
862 | int options[2]; | |
863 | ||
b6c77757 | 864 | /* pci bus */ |
ed9eccbe | 865 | options[0] = pcidev->bus->number; |
b6c77757 | 866 | /* pci slot */ |
ed9eccbe DS |
867 | options[1] = PCI_SLOT(pcidev->devfn); |
868 | ||
8629efa4 BP |
869 | return comedi_auto_config(&pcidev->dev, board_name, |
870 | options, ARRAY_SIZE(options)); | |
ed9eccbe DS |
871 | } |
872 | ||
873 | void comedi_pci_auto_unconfig(struct pci_dev *pcidev) | |
874 | { | |
875 | comedi_auto_unconfig(&pcidev->dev); | |
876 | } | |
c28264da | 877 | |
0a85b6f0 | 878 | int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name) |
c28264da BP |
879 | { |
880 | BUG_ON(usbdev == NULL); | |
881 | return comedi_auto_config(&usbdev->dev, board_name, NULL, 0); | |
882 | } | |
883 | ||
884 | void comedi_usb_auto_unconfig(struct usb_device *usbdev) | |
885 | { | |
886 | BUG_ON(usbdev == NULL); | |
887 | comedi_auto_unconfig(&usbdev->dev); | |
888 | } |