drivers.c revision ed9eccbe8970f6eedc1b978c157caf1251a896d4
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/errno.h> 32#include <linux/kernel.h> 33#include <linux/sched.h> 34#include <linux/fcntl.h> 35#include <linux/delay.h> 36#include <linux/ioport.h> 37#include <linux/mm.h> 38#include <linux/slab.h> 39#include "comedidev.h" 40#include "wrapper.h" 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 46#include <asm/io.h> 47#include <asm/system.h> 48 49static int postconfig(comedi_device * dev); 50static int insn_rw_emulate_bits(comedi_device * dev, comedi_subdevice * s, 51 comedi_insn * insn, lsampl_t * data); 52static void *comedi_recognize(comedi_driver * driv, const char *name); 53static void comedi_report_boards(comedi_driver * driv); 54static int poll_invalid(comedi_device * dev, comedi_subdevice * s); 55int comedi_buf_alloc(comedi_device * dev, comedi_subdevice * s, 56 unsigned long new_size); 57 58comedi_driver *comedi_drivers; 59 60int comedi_modprobe(int minor) 61{ 62 return -EINVAL; 63} 64 65static void cleanup_device(comedi_device * dev) 66{ 67 int i; 68 comedi_subdevice *s; 69 70 if (dev->subdevices) { 71 for (i = 0; i < dev->n_subdevices; i++) { 72 s = dev->subdevices + i; 73 comedi_free_subdevice_minor(s); 74 if (s->async) { 75 comedi_buf_alloc(dev, s, 0); 76 kfree(s->async); 77 } 78 } 79 kfree(dev->subdevices); 80 dev->subdevices = NULL; 81 dev->n_subdevices = 0; 82 } 83 if (dev->private) { 84 kfree(dev->private); 85 dev->private = NULL; 86 } 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(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 } 107 cleanup_device(dev); 108} 109 110void comedi_device_detach(comedi_device * dev) 111{ 112 if (!dev->attached) 113 return; 114 __comedi_device_detach(dev); 115} 116 117int comedi_device_attach(comedi_device * dev, comedi_devconfig * it) 118{ 119 comedi_driver *driv; 120 int ret; 121 122 if (dev->attached) 123 return -EBUSY; 124 125 for (driv = comedi_drivers; driv; driv = driv->next) { 126 if (!try_module_get(driv->module)) { 127 printk("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(comedi_driver * driver) 185{ 186 driver->next = comedi_drivers; 187 comedi_drivers = driver; 188 189 return 0; 190} 191 192int comedi_driver_unregister(comedi_driver * driver) 193{ 194 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 = comedi_get_device_file_info(i); 200 comedi_device *dev; 201 202 if(dev_file_info == NULL) continue; 203 dev = dev_file_info->device; 204 205 mutex_lock(&dev->mutex); 206 if (dev->attached && dev->driver == driver) { 207 if (dev->use_count) 208 printk("BUG! detaching device with use_count=%d\n", dev->use_count); 209 comedi_device_detach(dev); 210 } 211 mutex_unlock(&dev->mutex); 212 } 213 214 if (comedi_drivers == driver) { 215 comedi_drivers = driver->next; 216 return 0; 217 } 218 219 for (prev = comedi_drivers; prev->next; prev = prev->next) { 220 if (prev->next == driver) { 221 prev->next = driver->next; 222 return 0; 223 } 224 } 225 return -EINVAL; 226} 227 228static int postconfig(comedi_device * dev) 229{ 230 int i; 231 comedi_subdevice *s; 232 comedi_async *async = NULL; 233 int ret; 234 235 for (i = 0; i < dev->n_subdevices; i++) { 236 s = dev->subdevices + i; 237 238 if (s->type == COMEDI_SUBD_UNUSED) 239 continue; 240 241 if (s->len_chanlist == 0) 242 s->len_chanlist = 1; 243 244 if (s->do_cmd) { 245 BUG_ON((s->subdev_flags & (SDF_CMD_READ | 246 SDF_CMD_WRITE)) == 0); 247 BUG_ON(!s->do_cmdtest); 248 249 async = kzalloc(sizeof(comedi_async), GFP_KERNEL); 250 if (async == NULL) { 251 printk("failed to allocate async struct\n"); 252 return -ENOMEM; 253 } 254 init_waitqueue_head(&async->wait_head); 255 async->subdevice = s; 256 s->async = async; 257 258#define DEFAULT_BUF_MAXSIZE (64*1024) 259#define DEFAULT_BUF_SIZE (64*1024) 260 261 async->max_bufsize = DEFAULT_BUF_MAXSIZE; 262 263 async->prealloc_buf = NULL; 264 async->prealloc_bufsz = 0; 265 if (comedi_buf_alloc(dev, s, DEFAULT_BUF_SIZE) < 0) { 266 printk("Buffer allocation failed\n"); 267 return -ENOMEM; 268 } 269 if (s->buf_change) { 270 ret = s->buf_change(dev, s, DEFAULT_BUF_SIZE); 271 if (ret < 0) 272 return ret; 273 } 274 comedi_alloc_subdevice_minor(dev, s); 275 } 276 277 if (!s->range_table && !s->range_table_list) 278 s->range_table = &range_unknown; 279 280 if (!s->insn_read && s->insn_bits) 281 s->insn_read = insn_rw_emulate_bits; 282 if (!s->insn_write && s->insn_bits) 283 s->insn_write = insn_rw_emulate_bits; 284 285 if (!s->insn_read) 286 s->insn_read = insn_inval; 287 if (!s->insn_write) 288 s->insn_write = insn_inval; 289 if (!s->insn_bits) 290 s->insn_bits = insn_inval; 291 if (!s->insn_config) 292 s->insn_config = insn_inval; 293 294 if (!s->poll) 295 s->poll = poll_invalid; 296 } 297 298 return 0; 299} 300 301// generic recognize function for drivers that register their supported board names 302void *comedi_recognize(comedi_driver * driv, const char *name) 303{ 304 unsigned i; 305 const char *const *name_ptr = driv->board_name; 306 for (i = 0; i < driv->num_names; i++) { 307 if (strcmp(*name_ptr, name) == 0) 308 return (void *)name_ptr; 309 name_ptr = 310 (const char *const *)((const char *)name_ptr + 311 driv->offset); 312 } 313 314 return NULL; 315} 316 317void comedi_report_boards(comedi_driver * driv) 318{ 319 unsigned int i; 320 const char *const *name_ptr; 321 322 printk("comedi: valid board names for %s driver are:\n", 323 driv->driver_name); 324 325 name_ptr = driv->board_name; 326 for (i = 0; i < driv->num_names; i++) { 327 printk(" %s\n", *name_ptr); 328 name_ptr = (const char **)((char *)name_ptr + driv->offset); 329 } 330 331 if (driv->num_names == 0) 332 printk(" %s\n", driv->driver_name); 333} 334 335static int poll_invalid(comedi_device * dev, comedi_subdevice * s) 336{ 337 return -EINVAL; 338} 339 340int insn_inval(comedi_device * dev, comedi_subdevice * s, 341 comedi_insn * insn, lsampl_t * data) 342{ 343 return -EINVAL; 344} 345 346static int insn_rw_emulate_bits(comedi_device * dev, comedi_subdevice * s, 347 comedi_insn * insn, lsampl_t * data) 348{ 349 comedi_insn new_insn; 350 int ret; 351 static const unsigned channels_per_bitfield = 32; 352 353 unsigned chan = CR_CHAN(insn->chanspec); 354 const unsigned base_bitfield_channel = 355 (chan < channels_per_bitfield) ? 0 : chan; 356 lsampl_t new_data[2]; 357 memset(new_data, 0, sizeof(new_data)); 358 memset(&new_insn, 0, sizeof(new_insn)); 359 new_insn.insn = INSN_BITS; 360 new_insn.chanspec = base_bitfield_channel; 361 new_insn.n = 2; 362 new_insn.data = new_data; 363 new_insn.subdev = insn->subdev; 364 365 if (insn->insn == INSN_WRITE) { 366 if (!(s->subdev_flags & SDF_WRITABLE)) 367 return -EINVAL; 368 new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ 369 new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) : 0; /* bits */ 370 } 371 372 ret = s->insn_bits(dev, s, &new_insn, new_data); 373 if (ret < 0) 374 return ret; 375 376 if (insn->insn == INSN_READ) { 377 data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; 378 } 379 380 return 1; 381} 382 383static inline unsigned long uvirt_to_kva(pgd_t * pgd, unsigned long adr) 384{ 385 unsigned long ret = 0UL; 386 pmd_t *pmd; 387 pte_t *ptep, pte; 388 pud_t *pud; 389 390 if (!pgd_none(*pgd)) { 391 pud = pud_offset(pgd, adr); 392 pmd = pmd_offset(pud, adr); 393 if (!pmd_none(*pmd)) { 394 ptep = pte_offset_kernel(pmd, adr); 395 pte = *ptep; 396 if (pte_present(pte)) { 397 ret = (unsigned long) 398 page_address(pte_page(pte)); 399 ret |= (adr & (PAGE_SIZE - 1)); 400 } 401 } 402 } 403 return ret; 404} 405 406static inline unsigned long kvirt_to_kva(unsigned long adr) 407{ 408 unsigned long va, kva; 409 410 va = adr; 411 kva = uvirt_to_kva(pgd_offset_k(va), va); 412 413 return kva; 414} 415 416int comedi_buf_alloc(comedi_device * dev, comedi_subdevice * s, 417 unsigned long new_size) 418{ 419 comedi_async *async = s->async; 420 421 /* Round up new_size to multiple of PAGE_SIZE */ 422 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; 423 424 /* if no change is required, do nothing */ 425 if (async->prealloc_buf && async->prealloc_bufsz == new_size) { 426 return 0; 427 } 428 // deallocate old buffer 429 if (async->prealloc_buf) { 430 vunmap(async->prealloc_buf); 431 async->prealloc_buf = NULL; 432 async->prealloc_bufsz = 0; 433 } 434 if (async->buf_page_list) { 435 unsigned i; 436 for (i = 0; i < async->n_buf_pages; ++i) { 437 if (async->buf_page_list[i].virt_addr) { 438 mem_map_unreserve(virt_to_page(async-> 439 buf_page_list[i].virt_addr)); 440 if (s->async_dma_dir != DMA_NONE) { 441 dma_free_coherent(dev->hw_dev, 442 PAGE_SIZE, 443 async->buf_page_list[i]. 444 virt_addr, 445 async->buf_page_list[i]. 446 dma_addr); 447 } else { 448 free_page((unsigned long)async-> 449 buf_page_list[i].virt_addr); 450 } 451 } 452 } 453 vfree(async->buf_page_list); 454 async->buf_page_list = NULL; 455 async->n_buf_pages = 0; 456 } 457 // allocate new buffer 458 if (new_size) { 459 unsigned i = 0; 460 unsigned n_pages = new_size >> PAGE_SHIFT; 461 struct page **pages = NULL; 462 463 async->buf_page_list = 464 vmalloc(sizeof(struct comedi_buf_page) * n_pages); 465 if (async->buf_page_list) { 466 memset(async->buf_page_list, 0, 467 sizeof(struct comedi_buf_page) * n_pages); 468 pages = vmalloc(sizeof(struct page *) * n_pages); 469 } 470 if (pages) { 471 for (i = 0; i < n_pages; i++) { 472 if (s->async_dma_dir != DMA_NONE) { 473 async->buf_page_list[i].virt_addr = 474 dma_alloc_coherent(dev->hw_dev, 475 PAGE_SIZE, 476 &async->buf_page_list[i]. 477 dma_addr, 478 GFP_KERNEL | __GFP_COMP); 479 } else { 480 async->buf_page_list[i].virt_addr = 481 (void *) 482 get_zeroed_page(GFP_KERNEL); 483 } 484 if (async->buf_page_list[i].virt_addr == NULL) { 485 break; 486 } 487 mem_map_reserve(virt_to_page(async-> 488 buf_page_list[i].virt_addr)); 489 pages[i] = 490 virt_to_page(async->buf_page_list[i]. 491 virt_addr); 492 } 493 } 494 if (i == n_pages) { 495 async->prealloc_buf = 496 vmap(pages, n_pages, VM_MAP, 497 PAGE_KERNEL_NOCACHE); 498 } 499 if (pages) { 500 vfree(pages); 501 } 502 if (async->prealloc_buf == NULL) { 503 /* Some allocation failed above. */ 504 if (async->buf_page_list) { 505 for (i = 0; i < n_pages; i++) { 506 if (async->buf_page_list[i].virt_addr == 507 NULL) { 508 break; 509 } 510 mem_map_unreserve(virt_to_page(async-> 511 buf_page_list[i]. 512 virt_addr)); 513 if (s->async_dma_dir != DMA_NONE) { 514 dma_free_coherent(dev->hw_dev, 515 PAGE_SIZE, 516 async->buf_page_list[i]. 517 virt_addr, 518 async->buf_page_list[i]. 519 dma_addr); 520 } else { 521 free_page((unsigned long)async-> 522 buf_page_list[i]. 523 virt_addr); 524 } 525 } 526 vfree(async->buf_page_list); 527 async->buf_page_list = NULL; 528 } 529 return -ENOMEM; 530 } 531 async->n_buf_pages = n_pages; 532 } 533 async->prealloc_bufsz = new_size; 534 535 return 0; 536} 537 538/* munging is applied to data by core as it passes between user 539 * and kernel space */ 540unsigned int comedi_buf_munge(comedi_async * async, unsigned int num_bytes) 541{ 542 comedi_subdevice *s = async->subdevice; 543 unsigned int count = 0; 544 const unsigned num_sample_bytes = bytes_per_sample(s); 545 546 if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { 547 async->munge_count += num_bytes; 548 if ((int)(async->munge_count - async->buf_write_count) > 0) 549 BUG(); 550 return num_bytes; 551 } 552 /* don't munge partial samples */ 553 num_bytes -= num_bytes % num_sample_bytes; 554 while (count < num_bytes) { 555 int block_size; 556 557 block_size = num_bytes - count; 558 if (block_size < 0) { 559 rt_printk("%s: %s: bug! block_size is negative\n", 560 __FILE__, __FUNCTION__); 561 break; 562 } 563 if ((int)(async->munge_ptr + block_size - 564 async->prealloc_bufsz) > 0) 565 block_size = async->prealloc_bufsz - async->munge_ptr; 566 567 s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, 568 block_size, async->munge_chan); 569 570 smp_wmb(); //barrier insures data is munged in buffer before munge_count is incremented 571 572 async->munge_chan += block_size / num_sample_bytes; 573 async->munge_chan %= async->cmd.chanlist_len; 574 async->munge_count += block_size; 575 async->munge_ptr += block_size; 576 async->munge_ptr %= async->prealloc_bufsz; 577 count += block_size; 578 } 579 if ((int)(async->munge_count - async->buf_write_count) > 0) 580 BUG(); 581 return count; 582} 583 584unsigned int comedi_buf_write_n_available(comedi_async * async) 585{ 586 unsigned int free_end; 587 unsigned int nbytes; 588 589 if (async == NULL) 590 return 0; 591 592 free_end = async->buf_read_count + async->prealloc_bufsz; 593 nbytes = free_end - async->buf_write_alloc_count; 594 nbytes -= nbytes % bytes_per_sample(async->subdevice); 595 /* barrier insures the read of buf_read_count in this 596 query occurs before any following writes to the buffer which 597 might be based on the return value from this query. 598 */ 599 smp_mb(); 600 return nbytes; 601} 602 603/* allocates chunk for the writer from free buffer space */ 604unsigned int comedi_buf_write_alloc(comedi_async * async, unsigned int nbytes) 605{ 606 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 607 608 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { 609 nbytes = free_end - async->buf_write_alloc_count; 610 } 611 async->buf_write_alloc_count += nbytes; 612 /* barrier insures the read of buf_read_count above occurs before 613 we write data to the write-alloc'ed buffer space */ 614 smp_mb(); 615 return nbytes; 616} 617 618/* allocates nothing unless it can completely fulfill the request */ 619unsigned int comedi_buf_write_alloc_strict(comedi_async * async, 620 unsigned int nbytes) 621{ 622 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 623 624 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { 625 nbytes = 0; 626 } 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} 633 634/* transfers a chunk from writer to filled buffer space */ 635unsigned comedi_buf_write_free(comedi_async * async, unsigned int nbytes) 636{ 637 if ((int)(async->buf_write_count + nbytes - 638 async->buf_write_alloc_count) > 0) { 639 rt_printk 640 ("comedi: attempted to write-free more bytes than have been write-allocated.\n"); 641 nbytes = async->buf_write_alloc_count - async->buf_write_count; 642 } 643 async->buf_write_count += nbytes; 644 async->buf_write_ptr += nbytes; 645 comedi_buf_munge(async, async->buf_write_count - async->munge_count); 646 if (async->buf_write_ptr >= async->prealloc_bufsz) { 647 async->buf_write_ptr %= async->prealloc_bufsz; 648 } 649 return nbytes; 650} 651 652/* allocates a chunk for the reader from filled (and munged) buffer space */ 653unsigned comedi_buf_read_alloc(comedi_async * async, unsigned nbytes) 654{ 655 if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > 656 0) { 657 nbytes = async->munge_count - async->buf_read_alloc_count; 658 } 659 async->buf_read_alloc_count += nbytes; 660 /* barrier insures read of munge_count occurs before we actually read 661 data out of buffer */ 662 smp_rmb(); 663 return nbytes; 664} 665 666/* transfers control of a chunk from reader to free buffer space */ 667unsigned comedi_buf_read_free(comedi_async * async, unsigned int nbytes) 668{ 669 // barrier insures data has been read out of buffer before read count is incremented 670 smp_mb(); 671 if ((int)(async->buf_read_count + nbytes - 672 async->buf_read_alloc_count) > 0) { 673 rt_printk 674 ("comedi: attempted to read-free more bytes than have been read-allocated.\n"); 675 nbytes = async->buf_read_alloc_count - async->buf_read_count; 676 } 677 async->buf_read_count += nbytes; 678 async->buf_read_ptr += nbytes; 679 async->buf_read_ptr %= async->prealloc_bufsz; 680 return nbytes; 681} 682 683void comedi_buf_memcpy_to(comedi_async * async, unsigned int offset, 684 const void *data, unsigned int num_bytes) 685{ 686 unsigned int write_ptr = async->buf_write_ptr + offset; 687 688 if (write_ptr >= async->prealloc_bufsz) 689 write_ptr %= async->prealloc_bufsz; 690 691 while (num_bytes) { 692 unsigned int block_size; 693 694 if (write_ptr + num_bytes > async->prealloc_bufsz) 695 block_size = async->prealloc_bufsz - write_ptr; 696 else 697 block_size = num_bytes; 698 699 memcpy(async->prealloc_buf + write_ptr, data, block_size); 700 701 data += block_size; 702 num_bytes -= block_size; 703 704 write_ptr = 0; 705 } 706} 707 708void comedi_buf_memcpy_from(comedi_async * async, unsigned int offset, 709 void *dest, unsigned int nbytes) 710{ 711 void *src; 712 unsigned int read_ptr = async->buf_read_ptr + offset; 713 714 if (read_ptr >= async->prealloc_bufsz) 715 read_ptr %= async->prealloc_bufsz; 716 717 while (nbytes) { 718 unsigned int block_size; 719 720 src = async->prealloc_buf + read_ptr; 721 722 if (nbytes >= async->prealloc_bufsz - read_ptr) 723 block_size = async->prealloc_bufsz - read_ptr; 724 else 725 block_size = nbytes; 726 727 memcpy(dest, src, block_size); 728 nbytes -= block_size; 729 dest += block_size; 730 read_ptr = 0; 731 } 732} 733 734unsigned int comedi_buf_read_n_available(comedi_async * async) 735{ 736 unsigned num_bytes; 737 738 if (async == NULL) 739 return 0; 740 num_bytes = async->munge_count - async->buf_read_count; 741 /* barrier insures the read of munge_count in this 742 query occurs before any following reads of the buffer which 743 might be based on the return value from this query. 744 */ 745 smp_rmb(); 746 return num_bytes; 747} 748 749int comedi_buf_get(comedi_async * async, sampl_t * x) 750{ 751 unsigned int n = comedi_buf_read_n_available(async); 752 753 if (n < sizeof(sampl_t)) 754 return 0; 755 comedi_buf_read_alloc(async, sizeof(sampl_t)); 756 *x = *(sampl_t *) (async->prealloc_buf + async->buf_read_ptr); 757 comedi_buf_read_free(async, sizeof(sampl_t)); 758 return 1; 759} 760 761int comedi_buf_put(comedi_async * async, sampl_t x) 762{ 763 unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(sampl_t)); 764 765 if (n < sizeof(sampl_t)) { 766 async->events |= COMEDI_CB_ERROR; 767 return 0; 768 } 769 *(sampl_t *) (async->prealloc_buf + async->buf_write_ptr) = x; 770 comedi_buf_write_free(async, sizeof(sampl_t)); 771 return 1; 772} 773 774void comedi_reset_async_buf(comedi_async * async) 775{ 776 async->buf_write_alloc_count = 0; 777 async->buf_write_count = 0; 778 async->buf_read_alloc_count = 0; 779 async->buf_read_count = 0; 780 781 async->buf_write_ptr = 0; 782 async->buf_read_ptr = 0; 783 784 async->cur_chan = 0; 785 async->scan_progress = 0; 786 async->munge_chan = 0; 787 async->munge_count = 0; 788 async->munge_ptr = 0; 789 790 async->events = 0; 791} 792 793int comedi_auto_config(struct device *hardware_device, const char *board_name, const int *options, unsigned num_options) 794{ 795 comedi_devconfig it; 796 int minor; 797 struct comedi_device_file_info *dev_file_info; 798 int retval; 799 800 minor = comedi_alloc_board_minor(hardware_device); 801 if(minor < 0) return minor; 802 dev_set_drvdata(hardware_device, (void*)(unsigned long)minor); 803 804 dev_file_info = comedi_get_device_file_info(minor); 805 806 memset(&it, 0, sizeof(it)); 807 strncpy(it.board_name, board_name, COMEDI_NAMELEN); 808 it.board_name[COMEDI_NAMELEN - 1] = '\0'; 809 BUG_ON(num_options > COMEDI_NDEVCONFOPTS); 810 memcpy(it.options, options, num_options * sizeof(int)); 811 812 mutex_lock(&dev_file_info->device->mutex); 813 retval = comedi_device_attach(dev_file_info->device, &it); 814 mutex_unlock(&dev_file_info->device->mutex); 815 if(retval < 0) 816 { 817 comedi_free_board_minor(minor); 818 } 819 return retval; 820} 821 822void comedi_auto_unconfig(struct device *hardware_device) 823{ 824 unsigned long minor = (unsigned long)dev_get_drvdata(hardware_device); 825 826 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); 827 828 comedi_free_board_minor(minor); 829} 830 831int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) 832{ 833 int options[2]; 834 835 // pci bus 836 options[0] = pcidev->bus->number; 837 // pci slot 838 options[1] = PCI_SLOT(pcidev->devfn); 839 840 return comedi_auto_config(&pcidev->dev, board_name, options, sizeof(options) / sizeof(options[0])); 841} 842 843void comedi_pci_auto_unconfig(struct pci_dev *pcidev) 844{ 845 comedi_auto_unconfig(&pcidev->dev); 846} 847