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" | |
41 | #include "wrapper.h" | |
42 | #include <linux/highmem.h> /* for SuSE brokenness */ | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/cdev.h> | |
45 | #include <linux/dma-mapping.h> | |
46 | ||
47 | #include <asm/io.h> | |
48 | #include <asm/system.h> | |
49 | ||
71b5f4f1 | 50 | static int postconfig(struct comedi_device *dev); |
34c43922 | 51 | static int insn_rw_emulate_bits(struct comedi_device *dev, struct comedi_subdevice *s, |
90035c08 | 52 | struct comedi_insn *insn, unsigned int *data); |
139dfbdf BP |
53 | static void *comedi_recognize(struct comedi_driver * driv, const char *name); |
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, | |
ed9eccbe DS |
57 | unsigned long new_size); |
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; | |
101 | if (dev->driver) { | |
102 | dev->driver->detach(dev); | |
103 | } else { | |
104 | printk("BUG: dev->driver=NULL in comedi_device_detach()\n"); | |
105 | } | |
106 | cleanup_device(dev); | |
107 | } | |
108 | ||
71b5f4f1 | 109 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe DS |
110 | { |
111 | if (!dev->attached) | |
112 | return; | |
113 | __comedi_device_detach(dev); | |
114 | } | |
115 | ||
71b5f4f1 | 116 | int comedi_device_attach(struct comedi_device *dev, comedi_devconfig *it) |
ed9eccbe | 117 | { |
139dfbdf | 118 | struct comedi_driver *driv; |
ed9eccbe DS |
119 | int ret; |
120 | ||
121 | if (dev->attached) | |
122 | return -EBUSY; | |
123 | ||
124 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
125 | if (!try_module_get(driv->module)) { | |
126 | printk("comedi: failed to increment module count, skipping\n"); | |
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 | } | |
b6c77757 | 141 | /* initialize dev->driver here so comedi_error() can be called from attach */ |
ed9eccbe DS |
142 | dev->driver = driv; |
143 | ret = driv->attach(dev, it); | |
144 | if (ret < 0) { | |
145 | module_put(dev->driver->module); | |
146 | __comedi_device_detach(dev); | |
147 | return ret; | |
148 | } | |
149 | goto attached; | |
150 | } | |
151 | ||
b6c77757 BP |
152 | /* recognize has failed if we get here */ |
153 | /* report valid board names before returning error */ | |
ed9eccbe DS |
154 | for (driv = comedi_drivers; driv; driv = driv->next) { |
155 | if (!try_module_get(driv->module)) { | |
156 | printk("comedi: failed to increment module count\n"); | |
157 | continue; | |
158 | } | |
159 | comedi_report_boards(driv); | |
160 | module_put(driv->module); | |
161 | } | |
162 | return -EIO; | |
163 | ||
164 | attached: | |
165 | /* do a little post-config cleanup */ | |
166 | ret = postconfig(dev); | |
167 | module_put(dev->driver->module); | |
168 | if (ret < 0) { | |
169 | __comedi_device_detach(dev); | |
170 | return ret; | |
171 | } | |
172 | ||
173 | if (!dev->board_name) { | |
174 | printk("BUG: dev->board_name=<%p>\n", dev->board_name); | |
175 | dev->board_name = "BUG"; | |
176 | } | |
177 | smp_wmb(); | |
178 | dev->attached = 1; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
139dfbdf | 183 | int comedi_driver_register(struct comedi_driver *driver) |
ed9eccbe DS |
184 | { |
185 | driver->next = comedi_drivers; | |
186 | comedi_drivers = driver; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
139dfbdf | 191 | int comedi_driver_unregister(struct comedi_driver *driver) |
ed9eccbe | 192 | { |
139dfbdf | 193 | struct comedi_driver *prev; |
ed9eccbe DS |
194 | int i; |
195 | ||
196 | /* check for devices using this driver */ | |
197 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
198 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(i); | |
71b5f4f1 | 199 | struct comedi_device *dev; |
ed9eccbe DS |
200 | |
201 | if(dev_file_info == NULL) continue; | |
202 | dev = dev_file_info->device; | |
203 | ||
204 | mutex_lock(&dev->mutex); | |
205 | if (dev->attached && dev->driver == driver) { | |
206 | if (dev->use_count) | |
207 | printk("BUG! detaching device with use_count=%d\n", dev->use_count); | |
208 | comedi_device_detach(dev); | |
209 | } | |
210 | mutex_unlock(&dev->mutex); | |
211 | } | |
212 | ||
213 | if (comedi_drivers == driver) { | |
214 | comedi_drivers = driver->next; | |
215 | return 0; | |
216 | } | |
217 | ||
218 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
219 | if (prev->next == driver) { | |
220 | prev->next = driver->next; | |
221 | return 0; | |
222 | } | |
223 | } | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
71b5f4f1 | 227 | static int postconfig(struct comedi_device *dev) |
ed9eccbe DS |
228 | { |
229 | int i; | |
34c43922 | 230 | struct comedi_subdevice *s; |
d163679c | 231 | struct comedi_async *async = NULL; |
ed9eccbe DS |
232 | int ret; |
233 | ||
234 | for (i = 0; i < dev->n_subdevices; i++) { | |
235 | s = dev->subdevices + i; | |
236 | ||
237 | if (s->type == COMEDI_SUBD_UNUSED) | |
238 | continue; | |
239 | ||
240 | if (s->len_chanlist == 0) | |
241 | s->len_chanlist = 1; | |
242 | ||
243 | if (s->do_cmd) { | |
244 | BUG_ON((s->subdev_flags & (SDF_CMD_READ | | |
245 | SDF_CMD_WRITE)) == 0); | |
246 | BUG_ON(!s->do_cmdtest); | |
247 | ||
d163679c | 248 | async = kzalloc(sizeof(struct comedi_async), GFP_KERNEL); |
ed9eccbe DS |
249 | if (async == NULL) { |
250 | printk("failed to allocate async struct\n"); | |
251 | return -ENOMEM; | |
252 | } | |
253 | init_waitqueue_head(&async->wait_head); | |
254 | async->subdevice = s; | |
255 | s->async = async; | |
256 | ||
257 | #define DEFAULT_BUF_MAXSIZE (64*1024) | |
258 | #define DEFAULT_BUF_SIZE (64*1024) | |
259 | ||
260 | async->max_bufsize = DEFAULT_BUF_MAXSIZE; | |
261 | ||
262 | async->prealloc_buf = NULL; | |
263 | async->prealloc_bufsz = 0; | |
264 | if (comedi_buf_alloc(dev, s, DEFAULT_BUF_SIZE) < 0) { | |
265 | printk("Buffer allocation failed\n"); | |
266 | return -ENOMEM; | |
267 | } | |
268 | if (s->buf_change) { | |
269 | ret = s->buf_change(dev, s, DEFAULT_BUF_SIZE); | |
270 | if (ret < 0) | |
271 | return ret; | |
272 | } | |
273 | comedi_alloc_subdevice_minor(dev, s); | |
274 | } | |
275 | ||
276 | if (!s->range_table && !s->range_table_list) | |
277 | s->range_table = &range_unknown; | |
278 | ||
279 | if (!s->insn_read && s->insn_bits) | |
280 | s->insn_read = insn_rw_emulate_bits; | |
281 | if (!s->insn_write && s->insn_bits) | |
282 | s->insn_write = insn_rw_emulate_bits; | |
283 | ||
284 | if (!s->insn_read) | |
285 | s->insn_read = insn_inval; | |
286 | if (!s->insn_write) | |
287 | s->insn_write = insn_inval; | |
288 | if (!s->insn_bits) | |
289 | s->insn_bits = insn_inval; | |
290 | if (!s->insn_config) | |
291 | s->insn_config = insn_inval; | |
292 | ||
293 | if (!s->poll) | |
294 | s->poll = poll_invalid; | |
295 | } | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
b6c77757 | 300 | /* generic recognize function for drivers that register their supported board names */ |
139dfbdf | 301 | void *comedi_recognize(struct comedi_driver * driv, const char *name) |
ed9eccbe DS |
302 | { |
303 | unsigned i; | |
304 | const char *const *name_ptr = driv->board_name; | |
305 | for (i = 0; i < driv->num_names; i++) { | |
306 | if (strcmp(*name_ptr, name) == 0) | |
307 | return (void *)name_ptr; | |
308 | name_ptr = | |
309 | (const char *const *)((const char *)name_ptr + | |
310 | driv->offset); | |
311 | } | |
312 | ||
313 | return NULL; | |
314 | } | |
315 | ||
139dfbdf | 316 | void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
317 | { |
318 | unsigned int i; | |
319 | const char *const *name_ptr; | |
320 | ||
321 | printk("comedi: valid board names for %s driver are:\n", | |
322 | driv->driver_name); | |
323 | ||
324 | name_ptr = driv->board_name; | |
325 | for (i = 0; i < driv->num_names; i++) { | |
326 | printk(" %s\n", *name_ptr); | |
327 | name_ptr = (const char **)((char *)name_ptr + driv->offset); | |
328 | } | |
329 | ||
330 | if (driv->num_names == 0) | |
331 | printk(" %s\n", driv->driver_name); | |
332 | } | |
333 | ||
34c43922 | 334 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe DS |
335 | { |
336 | return -EINVAL; | |
337 | } | |
338 | ||
34c43922 | 339 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
90035c08 | 340 | struct comedi_insn *insn, unsigned int *data) |
ed9eccbe DS |
341 | { |
342 | return -EINVAL; | |
343 | } | |
344 | ||
34c43922 | 345 | static int insn_rw_emulate_bits(struct comedi_device *dev, struct comedi_subdevice *s, |
90035c08 | 346 | struct comedi_insn *insn, unsigned int *data) |
ed9eccbe | 347 | { |
90035c08 | 348 | struct comedi_insn new_insn; |
ed9eccbe DS |
349 | int ret; |
350 | static const unsigned channels_per_bitfield = 32; | |
351 | ||
352 | unsigned chan = CR_CHAN(insn->chanspec); | |
353 | const unsigned base_bitfield_channel = | |
354 | (chan < channels_per_bitfield) ? 0 : chan; | |
790c5541 | 355 | unsigned int new_data[2]; |
ed9eccbe DS |
356 | memset(new_data, 0, sizeof(new_data)); |
357 | memset(&new_insn, 0, sizeof(new_insn)); | |
358 | new_insn.insn = INSN_BITS; | |
359 | new_insn.chanspec = base_bitfield_channel; | |
360 | new_insn.n = 2; | |
361 | new_insn.data = new_data; | |
362 | new_insn.subdev = insn->subdev; | |
363 | ||
364 | if (insn->insn == INSN_WRITE) { | |
365 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
366 | return -EINVAL; | |
367 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ | |
368 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) : 0; /* bits */ | |
369 | } | |
370 | ||
371 | ret = s->insn_bits(dev, s, &new_insn, new_data); | |
372 | if (ret < 0) | |
373 | return ret; | |
374 | ||
375 | if (insn->insn == INSN_READ) { | |
376 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; | |
377 | } | |
378 | ||
379 | return 1; | |
380 | } | |
381 | ||
e473e912 | 382 | static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) |
ed9eccbe DS |
383 | { |
384 | unsigned long ret = 0UL; | |
385 | pmd_t *pmd; | |
386 | pte_t *ptep, pte; | |
387 | pud_t *pud; | |
388 | ||
389 | if (!pgd_none(*pgd)) { | |
390 | pud = pud_offset(pgd, adr); | |
391 | pmd = pmd_offset(pud, adr); | |
392 | if (!pmd_none(*pmd)) { | |
393 | ptep = pte_offset_kernel(pmd, adr); | |
394 | pte = *ptep; | |
395 | if (pte_present(pte)) { | |
396 | ret = (unsigned long) | |
397 | page_address(pte_page(pte)); | |
398 | ret |= (adr & (PAGE_SIZE - 1)); | |
399 | } | |
400 | } | |
401 | } | |
402 | return ret; | |
403 | } | |
404 | ||
405 | static inline unsigned long kvirt_to_kva(unsigned long adr) | |
406 | { | |
407 | unsigned long va, kva; | |
408 | ||
409 | va = adr; | |
410 | kva = uvirt_to_kva(pgd_offset_k(va), va); | |
411 | ||
412 | return kva; | |
413 | } | |
414 | ||
34c43922 | 415 | int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, |
ed9eccbe DS |
416 | unsigned long new_size) |
417 | { | |
d163679c | 418 | struct comedi_async *async = s->async; |
ed9eccbe DS |
419 | |
420 | /* Round up new_size to multiple of PAGE_SIZE */ | |
421 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
422 | ||
423 | /* if no change is required, do nothing */ | |
424 | if (async->prealloc_buf && async->prealloc_bufsz == new_size) { | |
425 | return 0; | |
426 | } | |
b6c77757 | 427 | /* deallocate old buffer */ |
ed9eccbe DS |
428 | if (async->prealloc_buf) { |
429 | vunmap(async->prealloc_buf); | |
430 | async->prealloc_buf = NULL; | |
431 | async->prealloc_bufsz = 0; | |
432 | } | |
433 | if (async->buf_page_list) { | |
434 | unsigned i; | |
435 | for (i = 0; i < async->n_buf_pages; ++i) { | |
436 | if (async->buf_page_list[i].virt_addr) { | |
437 | mem_map_unreserve(virt_to_page(async-> | |
438 | buf_page_list[i].virt_addr)); | |
439 | if (s->async_dma_dir != DMA_NONE) { | |
440 | dma_free_coherent(dev->hw_dev, | |
441 | PAGE_SIZE, | |
442 | async->buf_page_list[i]. | |
443 | virt_addr, | |
444 | async->buf_page_list[i]. | |
445 | dma_addr); | |
446 | } else { | |
447 | free_page((unsigned long)async-> | |
448 | buf_page_list[i].virt_addr); | |
449 | } | |
450 | } | |
451 | } | |
452 | vfree(async->buf_page_list); | |
453 | async->buf_page_list = NULL; | |
454 | async->n_buf_pages = 0; | |
455 | } | |
b6c77757 | 456 | /* allocate new buffer */ |
ed9eccbe DS |
457 | if (new_size) { |
458 | unsigned i = 0; | |
459 | unsigned n_pages = new_size >> PAGE_SHIFT; | |
460 | struct page **pages = NULL; | |
461 | ||
462 | async->buf_page_list = | |
463 | vmalloc(sizeof(struct comedi_buf_page) * n_pages); | |
464 | if (async->buf_page_list) { | |
465 | memset(async->buf_page_list, 0, | |
466 | sizeof(struct comedi_buf_page) * n_pages); | |
467 | pages = vmalloc(sizeof(struct page *) * n_pages); | |
468 | } | |
469 | if (pages) { | |
470 | for (i = 0; i < n_pages; i++) { | |
471 | if (s->async_dma_dir != DMA_NONE) { | |
472 | async->buf_page_list[i].virt_addr = | |
473 | dma_alloc_coherent(dev->hw_dev, | |
474 | PAGE_SIZE, | |
475 | &async->buf_page_list[i]. | |
476 | dma_addr, | |
477 | GFP_KERNEL | __GFP_COMP); | |
478 | } else { | |
479 | async->buf_page_list[i].virt_addr = | |
480 | (void *) | |
481 | get_zeroed_page(GFP_KERNEL); | |
482 | } | |
483 | if (async->buf_page_list[i].virt_addr == NULL) { | |
484 | break; | |
485 | } | |
486 | mem_map_reserve(virt_to_page(async-> | |
487 | buf_page_list[i].virt_addr)); | |
488 | pages[i] = | |
489 | virt_to_page(async->buf_page_list[i]. | |
490 | virt_addr); | |
491 | } | |
492 | } | |
493 | if (i == n_pages) { | |
494 | async->prealloc_buf = | |
495 | vmap(pages, n_pages, VM_MAP, | |
496 | PAGE_KERNEL_NOCACHE); | |
497 | } | |
498 | if (pages) { | |
499 | vfree(pages); | |
500 | } | |
501 | if (async->prealloc_buf == NULL) { | |
502 | /* Some allocation failed above. */ | |
503 | if (async->buf_page_list) { | |
504 | for (i = 0; i < n_pages; i++) { | |
505 | if (async->buf_page_list[i].virt_addr == | |
506 | NULL) { | |
507 | break; | |
508 | } | |
509 | mem_map_unreserve(virt_to_page(async-> | |
510 | buf_page_list[i]. | |
511 | virt_addr)); | |
512 | if (s->async_dma_dir != DMA_NONE) { | |
513 | dma_free_coherent(dev->hw_dev, | |
514 | PAGE_SIZE, | |
515 | async->buf_page_list[i]. | |
516 | virt_addr, | |
517 | async->buf_page_list[i]. | |
518 | dma_addr); | |
519 | } else { | |
520 | free_page((unsigned long)async-> | |
521 | buf_page_list[i]. | |
522 | virt_addr); | |
523 | } | |
524 | } | |
525 | vfree(async->buf_page_list); | |
526 | async->buf_page_list = NULL; | |
527 | } | |
528 | return -ENOMEM; | |
529 | } | |
530 | async->n_buf_pages = n_pages; | |
531 | } | |
532 | async->prealloc_bufsz = new_size; | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | /* munging is applied to data by core as it passes between user | |
538 | * and kernel space */ | |
d163679c | 539 | unsigned int comedi_buf_munge(struct comedi_async *async, unsigned int num_bytes) |
ed9eccbe | 540 | { |
34c43922 | 541 | struct comedi_subdevice *s = async->subdevice; |
ed9eccbe DS |
542 | unsigned int count = 0; |
543 | const unsigned num_sample_bytes = bytes_per_sample(s); | |
544 | ||
545 | if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { | |
546 | async->munge_count += num_bytes; | |
547 | if ((int)(async->munge_count - async->buf_write_count) > 0) | |
548 | BUG(); | |
549 | return num_bytes; | |
550 | } | |
551 | /* don't munge partial samples */ | |
552 | num_bytes -= num_bytes % num_sample_bytes; | |
553 | while (count < num_bytes) { | |
554 | int block_size; | |
555 | ||
556 | block_size = num_bytes - count; | |
557 | if (block_size < 0) { | |
558 | rt_printk("%s: %s: bug! block_size is negative\n", | |
d599edca | 559 | __FILE__, __func__); |
ed9eccbe DS |
560 | break; |
561 | } | |
562 | if ((int)(async->munge_ptr + block_size - | |
563 | async->prealloc_bufsz) > 0) | |
564 | block_size = async->prealloc_bufsz - async->munge_ptr; | |
565 | ||
566 | s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, | |
567 | block_size, async->munge_chan); | |
568 | ||
b6c77757 | 569 | smp_wmb(); /* barrier insures data is munged in buffer before munge_count is incremented */ |
ed9eccbe DS |
570 | |
571 | async->munge_chan += block_size / num_sample_bytes; | |
572 | async->munge_chan %= async->cmd.chanlist_len; | |
573 | async->munge_count += block_size; | |
574 | async->munge_ptr += block_size; | |
575 | async->munge_ptr %= async->prealloc_bufsz; | |
576 | count += block_size; | |
577 | } | |
578 | if ((int)(async->munge_count - async->buf_write_count) > 0) | |
579 | BUG(); | |
580 | return count; | |
581 | } | |
582 | ||
d163679c | 583 | unsigned int comedi_buf_write_n_available(struct comedi_async *async) |
ed9eccbe DS |
584 | { |
585 | unsigned int free_end; | |
586 | unsigned int nbytes; | |
587 | ||
588 | if (async == NULL) | |
589 | return 0; | |
590 | ||
591 | free_end = async->buf_read_count + async->prealloc_bufsz; | |
592 | nbytes = free_end - async->buf_write_alloc_count; | |
593 | nbytes -= nbytes % bytes_per_sample(async->subdevice); | |
594 | /* barrier insures the read of buf_read_count in this | |
595 | query occurs before any following writes to the buffer which | |
596 | might be based on the return value from this query. | |
597 | */ | |
598 | smp_mb(); | |
599 | return nbytes; | |
600 | } | |
601 | ||
602 | /* allocates chunk for the writer from free buffer space */ | |
d163679c | 603 | unsigned int comedi_buf_write_alloc(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe DS |
604 | { |
605 | unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; | |
606 | ||
607 | if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { | |
608 | nbytes = free_end - async->buf_write_alloc_count; | |
609 | } | |
610 | async->buf_write_alloc_count += nbytes; | |
611 | /* barrier insures the read of buf_read_count above occurs before | |
612 | we write data to the write-alloc'ed buffer space */ | |
613 | smp_mb(); | |
614 | return nbytes; | |
615 | } | |
616 | ||
617 | /* allocates nothing unless it can completely fulfill the request */ | |
d163679c | 618 | unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async, |
ed9eccbe DS |
619 | unsigned int nbytes) |
620 | { | |
621 | unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; | |
622 | ||
623 | if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { | |
624 | nbytes = 0; | |
625 | } | |
626 | async->buf_write_alloc_count += nbytes; | |
627 | /* barrier insures the read of buf_read_count above occurs before | |
628 | we write data to the write-alloc'ed buffer space */ | |
629 | smp_mb(); | |
630 | return nbytes; | |
631 | } | |
632 | ||
633 | /* transfers a chunk from writer to filled buffer space */ | |
d163679c | 634 | unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe DS |
635 | { |
636 | if ((int)(async->buf_write_count + nbytes - | |
637 | async->buf_write_alloc_count) > 0) { | |
638 | rt_printk | |
639 | ("comedi: attempted to write-free more bytes than have been write-allocated.\n"); | |
640 | nbytes = async->buf_write_alloc_count - async->buf_write_count; | |
641 | } | |
642 | async->buf_write_count += nbytes; | |
643 | async->buf_write_ptr += nbytes; | |
644 | comedi_buf_munge(async, async->buf_write_count - async->munge_count); | |
645 | if (async->buf_write_ptr >= async->prealloc_bufsz) { | |
646 | async->buf_write_ptr %= async->prealloc_bufsz; | |
647 | } | |
648 | return nbytes; | |
649 | } | |
650 | ||
651 | /* allocates a chunk for the reader from filled (and munged) buffer space */ | |
d163679c | 652 | unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes) |
ed9eccbe DS |
653 | { |
654 | if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > | |
655 | 0) { | |
656 | nbytes = async->munge_count - async->buf_read_alloc_count; | |
657 | } | |
658 | async->buf_read_alloc_count += nbytes; | |
659 | /* barrier insures read of munge_count occurs before we actually read | |
660 | data out of buffer */ | |
661 | smp_rmb(); | |
662 | return nbytes; | |
663 | } | |
664 | ||
665 | /* transfers control of a chunk from reader to free buffer space */ | |
d163679c | 666 | unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes) |
ed9eccbe | 667 | { |
b6c77757 | 668 | /* barrier insures data has been read out of buffer before read count is incremented */ |
ed9eccbe DS |
669 | smp_mb(); |
670 | if ((int)(async->buf_read_count + nbytes - | |
671 | async->buf_read_alloc_count) > 0) { | |
672 | rt_printk | |
673 | ("comedi: attempted to read-free more bytes than have been read-allocated.\n"); | |
674 | nbytes = async->buf_read_alloc_count - async->buf_read_count; | |
675 | } | |
676 | async->buf_read_count += nbytes; | |
677 | async->buf_read_ptr += nbytes; | |
678 | async->buf_read_ptr %= async->prealloc_bufsz; | |
679 | return nbytes; | |
680 | } | |
681 | ||
d163679c | 682 | void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset, |
ed9eccbe DS |
683 | const void *data, unsigned int num_bytes) |
684 | { | |
685 | unsigned int write_ptr = async->buf_write_ptr + offset; | |
686 | ||
687 | if (write_ptr >= async->prealloc_bufsz) | |
688 | write_ptr %= async->prealloc_bufsz; | |
689 | ||
690 | while (num_bytes) { | |
691 | unsigned int block_size; | |
692 | ||
693 | if (write_ptr + num_bytes > async->prealloc_bufsz) | |
694 | block_size = async->prealloc_bufsz - write_ptr; | |
695 | else | |
696 | block_size = num_bytes; | |
697 | ||
698 | memcpy(async->prealloc_buf + write_ptr, data, block_size); | |
699 | ||
700 | data += block_size; | |
701 | num_bytes -= block_size; | |
702 | ||
703 | write_ptr = 0; | |
704 | } | |
705 | } | |
706 | ||
d163679c | 707 | void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset, |
ed9eccbe DS |
708 | void *dest, unsigned int nbytes) |
709 | { | |
710 | void *src; | |
711 | unsigned int read_ptr = async->buf_read_ptr + offset; | |
712 | ||
713 | if (read_ptr >= async->prealloc_bufsz) | |
714 | read_ptr %= async->prealloc_bufsz; | |
715 | ||
716 | while (nbytes) { | |
717 | unsigned int block_size; | |
718 | ||
719 | src = async->prealloc_buf + read_ptr; | |
720 | ||
721 | if (nbytes >= async->prealloc_bufsz - read_ptr) | |
722 | block_size = async->prealloc_bufsz - read_ptr; | |
723 | else | |
724 | block_size = nbytes; | |
725 | ||
726 | memcpy(dest, src, block_size); | |
727 | nbytes -= block_size; | |
728 | dest += block_size; | |
729 | read_ptr = 0; | |
730 | } | |
731 | } | |
732 | ||
d163679c | 733 | unsigned int comedi_buf_read_n_available(struct comedi_async *async) |
ed9eccbe DS |
734 | { |
735 | unsigned num_bytes; | |
736 | ||
737 | if (async == NULL) | |
738 | return 0; | |
739 | num_bytes = async->munge_count - async->buf_read_count; | |
740 | /* barrier insures the read of munge_count in this | |
741 | query occurs before any following reads of the buffer which | |
742 | might be based on the return value from this query. | |
743 | */ | |
744 | smp_rmb(); | |
745 | return num_bytes; | |
746 | } | |
747 | ||
d163679c | 748 | int comedi_buf_get(struct comedi_async *async, short *x) |
ed9eccbe DS |
749 | { |
750 | unsigned int n = comedi_buf_read_n_available(async); | |
751 | ||
790c5541 | 752 | if (n < sizeof(short)) |
ed9eccbe | 753 | return 0; |
790c5541 BP |
754 | comedi_buf_read_alloc(async, sizeof(short)); |
755 | *x = *(short *) (async->prealloc_buf + async->buf_read_ptr); | |
756 | comedi_buf_read_free(async, sizeof(short)); | |
ed9eccbe DS |
757 | return 1; |
758 | } | |
759 | ||
d163679c | 760 | int comedi_buf_put(struct comedi_async *async, short x) |
ed9eccbe | 761 | { |
790c5541 | 762 | unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short)); |
ed9eccbe | 763 | |
790c5541 | 764 | if (n < sizeof(short)) { |
ed9eccbe DS |
765 | async->events |= COMEDI_CB_ERROR; |
766 | return 0; | |
767 | } | |
790c5541 BP |
768 | *(short *) (async->prealloc_buf + async->buf_write_ptr) = x; |
769 | comedi_buf_write_free(async, sizeof(short)); | |
ed9eccbe DS |
770 | return 1; |
771 | } | |
772 | ||
d163679c | 773 | void comedi_reset_async_buf(struct comedi_async *async) |
ed9eccbe DS |
774 | { |
775 | async->buf_write_alloc_count = 0; | |
776 | async->buf_write_count = 0; | |
777 | async->buf_read_alloc_count = 0; | |
778 | async->buf_read_count = 0; | |
779 | ||
780 | async->buf_write_ptr = 0; | |
781 | async->buf_read_ptr = 0; | |
782 | ||
783 | async->cur_chan = 0; | |
784 | async->scan_progress = 0; | |
785 | async->munge_chan = 0; | |
786 | async->munge_count = 0; | |
787 | async->munge_ptr = 0; | |
788 | ||
789 | async->events = 0; | |
790 | } | |
791 | ||
792 | int comedi_auto_config(struct device *hardware_device, const char *board_name, const int *options, unsigned num_options) | |
793 | { | |
794 | comedi_devconfig it; | |
795 | int minor; | |
796 | struct comedi_device_file_info *dev_file_info; | |
797 | int retval; | |
c28264da | 798 | unsigned *private_data = NULL; |
ed9eccbe | 799 | |
719548ef IA |
800 | if (!comedi_autoconfig) { |
801 | dev_set_drvdata(hardware_device, NULL); | |
802 | return 0; | |
803 | } | |
6a9d7a21 | 804 | |
ed9eccbe DS |
805 | minor = comedi_alloc_board_minor(hardware_device); |
806 | if(minor < 0) return minor; | |
c28264da BP |
807 | |
808 | private_data = kmalloc(sizeof(unsigned), GFP_KERNEL); | |
809 | if (private_data == NULL) { | |
810 | retval = -ENOMEM; | |
811 | goto cleanup; | |
812 | } | |
813 | *private_data = minor; | |
814 | dev_set_drvdata(hardware_device, private_data); | |
ed9eccbe DS |
815 | |
816 | dev_file_info = comedi_get_device_file_info(minor); | |
817 | ||
818 | memset(&it, 0, sizeof(it)); | |
819 | strncpy(it.board_name, board_name, COMEDI_NAMELEN); | |
820 | it.board_name[COMEDI_NAMELEN - 1] = '\0'; | |
821 | BUG_ON(num_options > COMEDI_NDEVCONFOPTS); | |
822 | memcpy(it.options, options, num_options * sizeof(int)); | |
823 | ||
824 | mutex_lock(&dev_file_info->device->mutex); | |
825 | retval = comedi_device_attach(dev_file_info->device, &it); | |
826 | mutex_unlock(&dev_file_info->device->mutex); | |
c28264da BP |
827 | |
828 | cleanup: | |
ed9eccbe DS |
829 | if(retval < 0) |
830 | { | |
c28264da | 831 | kfree(private_data); |
ed9eccbe DS |
832 | comedi_free_board_minor(minor); |
833 | } | |
834 | return retval; | |
835 | } | |
836 | ||
837 | void comedi_auto_unconfig(struct device *hardware_device) | |
838 | { | |
c28264da BP |
839 | unsigned *minor = (unsigned *)dev_get_drvdata(hardware_device); |
840 | if(minor == NULL) return; | |
ed9eccbe | 841 | |
c28264da | 842 | BUG_ON(*minor >= COMEDI_NUM_BOARD_MINORS); |
ed9eccbe | 843 | |
c28264da BP |
844 | comedi_free_board_minor(*minor); |
845 | dev_set_drvdata(hardware_device, NULL); | |
846 | kfree(minor); | |
ed9eccbe DS |
847 | } |
848 | ||
849 | int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) | |
850 | { | |
851 | int options[2]; | |
852 | ||
b6c77757 | 853 | /* pci bus */ |
ed9eccbe | 854 | options[0] = pcidev->bus->number; |
b6c77757 | 855 | /* pci slot */ |
ed9eccbe DS |
856 | options[1] = PCI_SLOT(pcidev->devfn); |
857 | ||
858 | return comedi_auto_config(&pcidev->dev, board_name, options, sizeof(options) / sizeof(options[0])); | |
859 | } | |
860 | ||
861 | void comedi_pci_auto_unconfig(struct pci_dev *pcidev) | |
862 | { | |
863 | comedi_auto_unconfig(&pcidev->dev); | |
864 | } | |
c28264da BP |
865 | |
866 | int comedi_usb_auto_config(struct usb_device *usbdev, | |
867 | const char *board_name) | |
868 | { | |
869 | BUG_ON(usbdev == NULL); | |
870 | return comedi_auto_config(&usbdev->dev, board_name, NULL, 0); | |
871 | } | |
872 | ||
873 | void comedi_usb_auto_unconfig(struct usb_device *usbdev) | |
874 | { | |
875 | BUG_ON(usbdev == NULL); | |
876 | comedi_auto_unconfig(&usbdev->dev); | |
877 | } |