drivers.c revision 5617f9da4619ec975514e6b385a052e024215da3
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> 31#include <linux/usb.h> 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 <linux/io.h> 48#include <asm/system.h> 49 50static int postconfig(struct comedi_device *dev); 51static int insn_rw_emulate_bits(struct comedi_device *dev, 52 struct comedi_subdevice *s, 53 struct comedi_insn *insn, unsigned int *data); 54static void *comedi_recognize(struct comedi_driver *driv, const char *name); 55static void comedi_report_boards(struct comedi_driver *driv); 56static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s); 57int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, 58 unsigned long new_size); 59 60struct comedi_driver *comedi_drivers; 61 62int comedi_modprobe(int minor) 63{ 64 return -EINVAL; 65} 66 67static void cleanup_device(struct comedi_device *dev) 68{ 69 int i; 70 struct comedi_subdevice *s; 71 72 if (dev->subdevices) { 73 for (i = 0; i < dev->n_subdevices; i++) { 74 s = dev->subdevices + i; 75 comedi_free_subdevice_minor(s); 76 if (s->async) { 77 comedi_buf_alloc(dev, s, 0); 78 kfree(s->async); 79 } 80 } 81 kfree(dev->subdevices); 82 dev->subdevices = NULL; 83 dev->n_subdevices = 0; 84 } 85 kfree(dev->private); 86 dev->private = NULL; 87 dev->driver = 0; 88 dev->board_name = NULL; 89 dev->board_ptr = NULL; 90 dev->iobase = 0; 91 dev->irq = 0; 92 dev->read_subdev = NULL; 93 dev->write_subdev = NULL; 94 dev->open = NULL; 95 dev->close = NULL; 96 comedi_set_hw_dev(dev, NULL); 97} 98 99static void __comedi_device_detach(struct comedi_device *dev) 100{ 101 dev->attached = 0; 102 if (dev->driver) 103 dev->driver->detach(dev); 104 else 105 printk("BUG: dev->driver=NULL in comedi_device_detach()\n"); 106 cleanup_device(dev); 107} 108 109void comedi_device_detach(struct comedi_device *dev) 110{ 111 if (!dev->attached) 112 return; 113 __comedi_device_detach(dev); 114} 115 116int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) 117{ 118 struct comedi_driver *driv; 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 127 ("comedi: failed to increment module count, skipping\n"); 128 continue; 129 } 130 if (driv->num_names) { 131 dev->board_ptr = comedi_recognize(driv, it->board_name); 132 if (dev->board_ptr == NULL) { 133 module_put(driv->module); 134 continue; 135 } 136 } else { 137 if (strcmp(driv->driver_name, it->board_name)) { 138 module_put(driv->module); 139 continue; 140 } 141 } 142 /* initialize dev->driver here so comedi_error() can be called from attach */ 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 } 152 153 /* recognize has failed if we get here */ 154 /* report valid board names before returning error */ 155 for (driv = comedi_drivers; driv; driv = driv->next) { 156 if (!try_module_get(driv->module)) { 157 printk("comedi: failed to increment module count\n"); 158 continue; 159 } 160 comedi_report_boards(driv); 161 module_put(driv->module); 162 } 163 return -EIO; 164 165attached: 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) { 175 printk("BUG: dev->board_name=<%p>\n", dev->board_name); 176 dev->board_name = "BUG"; 177 } 178 smp_wmb(); 179 dev->attached = 1; 180 181 return 0; 182} 183 184int comedi_driver_register(struct comedi_driver *driver) 185{ 186 driver->next = comedi_drivers; 187 comedi_drivers = driver; 188 189 return 0; 190} 191 192int comedi_driver_unregister(struct comedi_driver *driver) 193{ 194 struct comedi_driver *prev; 195 int i; 196 197 /* check for devices using this driver */ 198 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { 199 struct comedi_device_file_info *dev_file_info = 200 comedi_get_device_file_info(i); 201 struct comedi_device *dev; 202 203 if (dev_file_info == NULL) 204 continue; 205 dev = dev_file_info->device; 206 207 mutex_lock(&dev->mutex); 208 if (dev->attached && dev->driver == driver) { 209 if (dev->use_count) 210 printk 211 ("BUG! detaching device with use_count=%d\n", 212 dev->use_count); 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 232static int postconfig(struct comedi_device *dev) 233{ 234 int i; 235 struct comedi_subdevice *s; 236 struct comedi_async *async = NULL; 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 | 250 SDF_CMD_WRITE)) == 0); 251 BUG_ON(!s->do_cmdtest); 252 253 async = 254 kzalloc(sizeof(struct comedi_async), GFP_KERNEL); 255 if (async == NULL) { 256 printk("failed to allocate async struct\n"); 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) { 271 printk("Buffer allocation failed\n"); 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} 305 306/* generic recognize function for drivers that register their supported board names */ 307void *comedi_recognize(struct comedi_driver *driv, const char *name) 308{ 309 unsigned i; 310 const char *const *name_ptr = driv->board_name; 311 for (i = 0; i < driv->num_names; i++) { 312 if (strcmp(*name_ptr, name) == 0) 313 return (void *)name_ptr; 314 name_ptr = 315 (const char *const *)((const char *)name_ptr + 316 driv->offset); 317 } 318 319 return NULL; 320} 321 322void comedi_report_boards(struct comedi_driver *driv) 323{ 324 unsigned int i; 325 const char *const *name_ptr; 326 327 printk("comedi: valid board names for %s driver are:\n", 328 driv->driver_name); 329 330 name_ptr = driv->board_name; 331 for (i = 0; i < driv->num_names; i++) { 332 printk(" %s\n", *name_ptr); 333 name_ptr = (const char **)((char *)name_ptr + driv->offset); 334 } 335 336 if (driv->num_names == 0) 337 printk(" %s\n", driv->driver_name); 338} 339 340static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) 341{ 342 return -EINVAL; 343} 344 345int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, 346 struct comedi_insn *insn, unsigned int *data) 347{ 348 return -EINVAL; 349} 350 351static int insn_rw_emulate_bits(struct comedi_device *dev, 352 struct comedi_subdevice *s, 353 struct comedi_insn *insn, unsigned int *data) 354{ 355 struct comedi_insn new_insn; 356 int ret; 357 static const unsigned channels_per_bitfield = 32; 358 359 unsigned chan = CR_CHAN(insn->chanspec); 360 const unsigned base_bitfield_channel = 361 (chan < channels_per_bitfield) ? 0 : chan; 362 unsigned int new_data[2]; 363 memset(new_data, 0, sizeof(new_data)); 364 memset(&new_insn, 0, sizeof(new_insn)); 365 new_insn.insn = INSN_BITS; 366 new_insn.chanspec = base_bitfield_channel; 367 new_insn.n = 2; 368 new_insn.data = new_data; 369 new_insn.subdev = insn->subdev; 370 371 if (insn->insn == INSN_WRITE) { 372 if (!(s->subdev_flags & SDF_WRITABLE)) 373 return -EINVAL; 374 new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ 375 new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) : 0; /* bits */ 376 } 377 378 ret = s->insn_bits(dev, s, &new_insn, new_data); 379 if (ret < 0) 380 return ret; 381 382 if (insn->insn == INSN_READ) 383 data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; 384 385 return 1; 386} 387 388static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) 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) 403 page_address(pte_page(pte)); 404 ret |= (adr & (PAGE_SIZE - 1)); 405 } 406 } 407 } 408 return ret; 409} 410 411static 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 421int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, 422 unsigned long new_size) 423{ 424 struct comedi_async *async = s->async; 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 */ 430 if (async->prealloc_buf && async->prealloc_bufsz == new_size) 431 return 0; 432 433 /* deallocate old buffer */ 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) { 443 mem_map_unreserve(virt_to_page 444 (async->buf_page_list[i]. 445 virt_addr)); 446 if (s->async_dma_dir != DMA_NONE) { 447 dma_free_coherent(dev->hw_dev, 448 PAGE_SIZE, 449 async-> 450 buf_page_list 451 [i].virt_addr, 452 async-> 453 buf_page_list 454 [i].dma_addr); 455 } else { 456 free_page((unsigned long) 457 async->buf_page_list[i]. 458 virt_addr); 459 } 460 } 461 } 462 vfree(async->buf_page_list); 463 async->buf_page_list = NULL; 464 async->n_buf_pages = 0; 465 } 466 /* allocate new buffer */ 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 = 473 vmalloc(sizeof(struct comedi_buf_page) * n_pages); 474 if (async->buf_page_list) { 475 memset(async->buf_page_list, 0, 476 sizeof(struct comedi_buf_page) * n_pages); 477 pages = vmalloc(sizeof(struct page *) * n_pages); 478 } 479 if (pages) { 480 for (i = 0; i < n_pages; i++) { 481 if (s->async_dma_dir != DMA_NONE) { 482 async->buf_page_list[i].virt_addr = 483 dma_alloc_coherent(dev->hw_dev, 484 PAGE_SIZE, 485 &async-> 486 buf_page_list 487 [i].dma_addr, 488 GFP_KERNEL | 489 __GFP_COMP); 490 } else { 491 async->buf_page_list[i].virt_addr = 492 (void *) 493 get_zeroed_page(GFP_KERNEL); 494 } 495 if (async->buf_page_list[i].virt_addr == NULL) 496 break; 497 498 mem_map_reserve(virt_to_page 499 (async->buf_page_list[i]. 500 virt_addr)); 501 pages[i] = 502 virt_to_page(async-> 503 buf_page_list[i].virt_addr); 504 } 505 } 506 if (i == n_pages) { 507 async->prealloc_buf = 508 vmap(pages, n_pages, VM_MAP, PAGE_KERNEL_NOCACHE); 509 } 510 vfree(pages); 511 512 if (async->prealloc_buf == NULL) { 513 /* Some allocation failed above. */ 514 if (async->buf_page_list) { 515 for (i = 0; i < n_pages; i++) { 516 if (async->buf_page_list[i].virt_addr == 517 NULL) { 518 break; 519 } 520 mem_map_unreserve(virt_to_page 521 (async->buf_page_list 522 [i].virt_addr)); 523 if (s->async_dma_dir != DMA_NONE) { 524 dma_free_coherent(dev->hw_dev, 525 PAGE_SIZE, 526 async-> 527 buf_page_list 528 [i].virt_addr, 529 async-> 530 buf_page_list 531 [i].dma_addr); 532 } else { 533 free_page((unsigned long) 534 async->buf_page_list 535 [i].virt_addr); 536 } 537 } 538 vfree(async->buf_page_list); 539 async->buf_page_list = NULL; 540 } 541 return -ENOMEM; 542 } 543 async->n_buf_pages = n_pages; 544 } 545 async->prealloc_bufsz = new_size; 546 547 return 0; 548} 549 550/* munging is applied to data by core as it passes between user 551 * and kernel space */ 552unsigned int comedi_buf_munge(struct comedi_async *async, 553 unsigned int num_bytes) 554{ 555 struct comedi_subdevice *s = async->subdevice; 556 unsigned int count = 0; 557 const unsigned num_sample_bytes = bytes_per_sample(s); 558 559 if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { 560 async->munge_count += num_bytes; 561 BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); 562 return num_bytes; 563 } 564 /* don't munge partial samples */ 565 num_bytes -= num_bytes % num_sample_bytes; 566 while (count < num_bytes) { 567 int block_size; 568 569 block_size = num_bytes - count; 570 if (block_size < 0) { 571 printk("%s: %s: bug! block_size is negative\n", 572 __FILE__, __func__); 573 break; 574 } 575 if ((int)(async->munge_ptr + block_size - 576 async->prealloc_bufsz) > 0) 577 block_size = async->prealloc_bufsz - async->munge_ptr; 578 579 s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, 580 block_size, async->munge_chan); 581 582 smp_wmb(); /* barrier insures data is munged in buffer before munge_count is incremented */ 583 584 async->munge_chan += block_size / num_sample_bytes; 585 async->munge_chan %= async->cmd.chanlist_len; 586 async->munge_count += block_size; 587 async->munge_ptr += block_size; 588 async->munge_ptr %= async->prealloc_bufsz; 589 count += block_size; 590 } 591 BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); 592 return count; 593} 594 595unsigned int comedi_buf_write_n_available(struct comedi_async *async) 596{ 597 unsigned int free_end; 598 unsigned int nbytes; 599 600 if (async == NULL) 601 return 0; 602 603 free_end = async->buf_read_count + async->prealloc_bufsz; 604 nbytes = free_end - async->buf_write_alloc_count; 605 nbytes -= nbytes % bytes_per_sample(async->subdevice); 606 /* barrier insures the read of buf_read_count in this 607 query occurs before any following writes to the buffer which 608 might be based on the return value from this query. 609 */ 610 smp_mb(); 611 return nbytes; 612} 613 614/* allocates chunk for the writer from free buffer space */ 615unsigned int comedi_buf_write_alloc(struct comedi_async *async, 616 unsigned int nbytes) 617{ 618 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 619 620 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) 621 nbytes = free_end - async->buf_write_alloc_count; 622 623 async->buf_write_alloc_count += nbytes; 624 /* barrier insures the read of buf_read_count above occurs before 625 we write data to the write-alloc'ed buffer space */ 626 smp_mb(); 627 return nbytes; 628} 629 630/* allocates nothing unless it can completely fulfill the request */ 631unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async, 632 unsigned int nbytes) 633{ 634 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 635 636 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) 637 nbytes = 0; 638 639 async->buf_write_alloc_count += nbytes; 640 /* barrier insures the read of buf_read_count above occurs before 641 we write data to the write-alloc'ed buffer space */ 642 smp_mb(); 643 return nbytes; 644} 645 646/* transfers a chunk from writer to filled buffer space */ 647unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) 648{ 649 if ((int)(async->buf_write_count + nbytes - 650 async->buf_write_alloc_count) > 0) { 651 printk 652 ("comedi: attempted to write-free more bytes than have been write-allocated.\n"); 653 nbytes = async->buf_write_alloc_count - async->buf_write_count; 654 } 655 async->buf_write_count += nbytes; 656 async->buf_write_ptr += nbytes; 657 comedi_buf_munge(async, async->buf_write_count - async->munge_count); 658 if (async->buf_write_ptr >= async->prealloc_bufsz) 659 async->buf_write_ptr %= async->prealloc_bufsz; 660 661 return nbytes; 662} 663 664/* allocates a chunk for the reader from filled (and munged) buffer space */ 665unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes) 666{ 667 if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > 668 0) { 669 nbytes = async->munge_count - async->buf_read_alloc_count; 670 } 671 async->buf_read_alloc_count += nbytes; 672 /* barrier insures read of munge_count occurs before we actually read 673 data out of buffer */ 674 smp_rmb(); 675 return nbytes; 676} 677 678/* transfers control of a chunk from reader to free buffer space */ 679unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes) 680{ 681 /* barrier insures data has been read out of buffer before read count is incremented */ 682 smp_mb(); 683 if ((int)(async->buf_read_count + nbytes - 684 async->buf_read_alloc_count) > 0) { 685 printk 686 ("comedi: attempted to read-free more bytes than have been read-allocated.\n"); 687 nbytes = async->buf_read_alloc_count - async->buf_read_count; 688 } 689 async->buf_read_count += nbytes; 690 async->buf_read_ptr += nbytes; 691 async->buf_read_ptr %= async->prealloc_bufsz; 692 return nbytes; 693} 694 695void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset, 696 const void *data, unsigned int num_bytes) 697{ 698 unsigned int write_ptr = async->buf_write_ptr + offset; 699 700 if (write_ptr >= async->prealloc_bufsz) 701 write_ptr %= async->prealloc_bufsz; 702 703 while (num_bytes) { 704 unsigned int block_size; 705 706 if (write_ptr + num_bytes > async->prealloc_bufsz) 707 block_size = async->prealloc_bufsz - write_ptr; 708 else 709 block_size = num_bytes; 710 711 memcpy(async->prealloc_buf + write_ptr, data, block_size); 712 713 data += block_size; 714 num_bytes -= block_size; 715 716 write_ptr = 0; 717 } 718} 719 720void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset, 721 void *dest, unsigned int nbytes) 722{ 723 void *src; 724 unsigned int read_ptr = async->buf_read_ptr + offset; 725 726 if (read_ptr >= async->prealloc_bufsz) 727 read_ptr %= async->prealloc_bufsz; 728 729 while (nbytes) { 730 unsigned int block_size; 731 732 src = async->prealloc_buf + read_ptr; 733 734 if (nbytes >= async->prealloc_bufsz - read_ptr) 735 block_size = async->prealloc_bufsz - read_ptr; 736 else 737 block_size = nbytes; 738 739 memcpy(dest, src, block_size); 740 nbytes -= block_size; 741 dest += block_size; 742 read_ptr = 0; 743 } 744} 745 746unsigned int comedi_buf_read_n_available(struct comedi_async *async) 747{ 748 unsigned num_bytes; 749 750 if (async == NULL) 751 return 0; 752 num_bytes = async->munge_count - async->buf_read_count; 753 /* barrier insures the read of munge_count in this 754 query occurs before any following reads of the buffer which 755 might be based on the return value from this query. 756 */ 757 smp_rmb(); 758 return num_bytes; 759} 760 761int comedi_buf_get(struct comedi_async *async, short *x) 762{ 763 unsigned int n = comedi_buf_read_n_available(async); 764 765 if (n < sizeof(short)) 766 return 0; 767 comedi_buf_read_alloc(async, sizeof(short)); 768 *x = *(short *)(async->prealloc_buf + async->buf_read_ptr); 769 comedi_buf_read_free(async, sizeof(short)); 770 return 1; 771} 772 773int comedi_buf_put(struct comedi_async *async, short x) 774{ 775 unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short)); 776 777 if (n < sizeof(short)) { 778 async->events |= COMEDI_CB_ERROR; 779 return 0; 780 } 781 *(short *)(async->prealloc_buf + async->buf_write_ptr) = x; 782 comedi_buf_write_free(async, sizeof(short)); 783 return 1; 784} 785 786void comedi_reset_async_buf(struct comedi_async *async) 787{ 788 async->buf_write_alloc_count = 0; 789 async->buf_write_count = 0; 790 async->buf_read_alloc_count = 0; 791 async->buf_read_count = 0; 792 793 async->buf_write_ptr = 0; 794 async->buf_read_ptr = 0; 795 796 async->cur_chan = 0; 797 async->scan_progress = 0; 798 async->munge_chan = 0; 799 async->munge_count = 0; 800 async->munge_ptr = 0; 801 802 async->events = 0; 803} 804 805int comedi_auto_config(struct device *hardware_device, const char *board_name, 806 const int *options, unsigned num_options) 807{ 808 struct comedi_devconfig it; 809 int minor; 810 struct comedi_device_file_info *dev_file_info; 811 int retval; 812 unsigned *private_data = NULL; 813 814 if (!comedi_autoconfig) { 815 dev_set_drvdata(hardware_device, NULL); 816 return 0; 817 } 818 819 minor = comedi_alloc_board_minor(hardware_device); 820 if (minor < 0) 821 return minor; 822 823 private_data = kmalloc(sizeof(unsigned), GFP_KERNEL); 824 if (private_data == NULL) { 825 retval = -ENOMEM; 826 goto cleanup; 827 } 828 *private_data = minor; 829 dev_set_drvdata(hardware_device, private_data); 830 831 dev_file_info = comedi_get_device_file_info(minor); 832 833 memset(&it, 0, sizeof(it)); 834 strncpy(it.board_name, board_name, COMEDI_NAMELEN); 835 it.board_name[COMEDI_NAMELEN - 1] = '\0'; 836 BUG_ON(num_options > COMEDI_NDEVCONFOPTS); 837 memcpy(it.options, options, num_options * sizeof(int)); 838 839 mutex_lock(&dev_file_info->device->mutex); 840 retval = comedi_device_attach(dev_file_info->device, &it); 841 mutex_unlock(&dev_file_info->device->mutex); 842 843cleanup: 844 if (retval < 0) { 845 kfree(private_data); 846 comedi_free_board_minor(minor); 847 } 848 return retval; 849} 850 851void comedi_auto_unconfig(struct device *hardware_device) 852{ 853 unsigned *minor = (unsigned *)dev_get_drvdata(hardware_device); 854 if (minor == NULL) 855 return; 856 857 BUG_ON(*minor >= COMEDI_NUM_BOARD_MINORS); 858 859 comedi_free_board_minor(*minor); 860 dev_set_drvdata(hardware_device, NULL); 861 kfree(minor); 862} 863 864int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) 865{ 866 int options[2]; 867 868 /* pci bus */ 869 options[0] = pcidev->bus->number; 870 /* pci slot */ 871 options[1] = PCI_SLOT(pcidev->devfn); 872 873 return comedi_auto_config(&pcidev->dev, board_name, 874 options, ARRAY_SIZE(options)); 875} 876 877void comedi_pci_auto_unconfig(struct pci_dev *pcidev) 878{ 879 comedi_auto_unconfig(&pcidev->dev); 880} 881 882int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name) 883{ 884 BUG_ON(usbdev == NULL); 885 return comedi_auto_config(&usbdev->dev, board_name, NULL, 0); 886} 887 888void comedi_usb_auto_unconfig(struct usb_device *usbdev) 889{ 890 BUG_ON(usbdev == NULL); 891 comedi_auto_unconfig(&usbdev->dev); 892} 893