drivers.c revision 5f74ea14c07fee91d3bdbaad88bff6264c6200e6
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 <asm/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, struct comedi_subdevice *s, 52 struct comedi_insn *insn, unsigned int *data); 53static void *comedi_recognize(struct comedi_driver * driv, const char *name); 54static void comedi_report_boards(struct comedi_driver *driv); 55static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s); 56int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, 57 unsigned long new_size); 58 59struct comedi_driver *comedi_drivers; 60 61int comedi_modprobe(int minor) 62{ 63 return -EINVAL; 64} 65 66static void cleanup_device(struct comedi_device *dev) 67{ 68 int i; 69 struct comedi_subdevice *s; 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 } 84 kfree(dev->private); 85 dev->private = NULL; 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 98static void __comedi_device_detach(struct comedi_device *dev) 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 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("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 } 141 /* initialize dev->driver here so comedi_error() can be called from attach */ 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 } 151 152 /* recognize has failed if we get here */ 153 /* report valid board names before returning error */ 154 for (driv = comedi_drivers; driv; driv = driv->next) { 155 if (!try_module_get(driv->module)) { 156 printk("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 164attached: 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 183int comedi_driver_register(struct comedi_driver *driver) 184{ 185 driver->next = comedi_drivers; 186 comedi_drivers = driver; 187 188 return 0; 189} 190 191int comedi_driver_unregister(struct comedi_driver *driver) 192{ 193 struct comedi_driver *prev; 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); 199 struct comedi_device *dev; 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 227static int postconfig(struct comedi_device *dev) 228{ 229 int i; 230 struct comedi_subdevice *s; 231 struct comedi_async *async = NULL; 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); 247 248 async = kzalloc(sizeof(struct comedi_async), GFP_KERNEL); 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} 299 300/* generic recognize function for drivers that register their supported board names */ 301void *comedi_recognize(struct comedi_driver * driv, const char *name) 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 316void comedi_report_boards(struct comedi_driver *driv) 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 334static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) 335{ 336 return -EINVAL; 337} 338 339int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, 340 struct comedi_insn *insn, unsigned int *data) 341{ 342 return -EINVAL; 343} 344 345static int insn_rw_emulate_bits(struct comedi_device *dev, struct comedi_subdevice *s, 346 struct comedi_insn *insn, unsigned int *data) 347{ 348 struct comedi_insn new_insn; 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; 355 unsigned int new_data[2]; 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 382static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) 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 405static 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 415int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s, 416 unsigned long new_size) 417{ 418 struct comedi_async *async = s->async; 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 } 427 /* deallocate old buffer */ 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 } 456 /* allocate new buffer */ 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 */ 539unsigned int comedi_buf_munge(struct comedi_async *async, unsigned int num_bytes) 540{ 541 struct comedi_subdevice *s = async->subdevice; 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 BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); 548 return num_bytes; 549 } 550 /* don't munge partial samples */ 551 num_bytes -= num_bytes % num_sample_bytes; 552 while (count < num_bytes) { 553 int block_size; 554 555 block_size = num_bytes - count; 556 if (block_size < 0) { 557 printk("%s: %s: bug! block_size is negative\n", 558 __FILE__, __func__); 559 break; 560 } 561 if ((int)(async->munge_ptr + block_size - 562 async->prealloc_bufsz) > 0) 563 block_size = async->prealloc_bufsz - async->munge_ptr; 564 565 s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, 566 block_size, async->munge_chan); 567 568 smp_wmb(); /* barrier insures data is munged in buffer before munge_count is incremented */ 569 570 async->munge_chan += block_size / num_sample_bytes; 571 async->munge_chan %= async->cmd.chanlist_len; 572 async->munge_count += block_size; 573 async->munge_ptr += block_size; 574 async->munge_ptr %= async->prealloc_bufsz; 575 count += block_size; 576 } 577 BUG_ON((int)(async->munge_count - async->buf_write_count) > 0); 578 return count; 579} 580 581unsigned int comedi_buf_write_n_available(struct comedi_async *async) 582{ 583 unsigned int free_end; 584 unsigned int nbytes; 585 586 if (async == NULL) 587 return 0; 588 589 free_end = async->buf_read_count + async->prealloc_bufsz; 590 nbytes = free_end - async->buf_write_alloc_count; 591 nbytes -= nbytes % bytes_per_sample(async->subdevice); 592 /* barrier insures the read of buf_read_count in this 593 query occurs before any following writes to the buffer which 594 might be based on the return value from this query. 595 */ 596 smp_mb(); 597 return nbytes; 598} 599 600/* allocates chunk for the writer from free buffer space */ 601unsigned int comedi_buf_write_alloc(struct comedi_async *async, unsigned int nbytes) 602{ 603 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 604 605 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { 606 nbytes = free_end - async->buf_write_alloc_count; 607 } 608 async->buf_write_alloc_count += nbytes; 609 /* barrier insures the read of buf_read_count above occurs before 610 we write data to the write-alloc'ed buffer space */ 611 smp_mb(); 612 return nbytes; 613} 614 615/* allocates nothing unless it can completely fulfill the request */ 616unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async, 617 unsigned int nbytes) 618{ 619 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 620 621 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { 622 nbytes = 0; 623 } 624 async->buf_write_alloc_count += nbytes; 625 /* barrier insures the read of buf_read_count above occurs before 626 we write data to the write-alloc'ed buffer space */ 627 smp_mb(); 628 return nbytes; 629} 630 631/* transfers a chunk from writer to filled buffer space */ 632unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) 633{ 634 if ((int)(async->buf_write_count + nbytes - 635 async->buf_write_alloc_count) > 0) { 636 printk("comedi: attempted to write-free more bytes than have been write-allocated.\n"); 637 nbytes = async->buf_write_alloc_count - async->buf_write_count; 638 } 639 async->buf_write_count += nbytes; 640 async->buf_write_ptr += nbytes; 641 comedi_buf_munge(async, async->buf_write_count - async->munge_count); 642 if (async->buf_write_ptr >= async->prealloc_bufsz) { 643 async->buf_write_ptr %= async->prealloc_bufsz; 644 } 645 return nbytes; 646} 647 648/* allocates a chunk for the reader from filled (and munged) buffer space */ 649unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes) 650{ 651 if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > 652 0) { 653 nbytes = async->munge_count - async->buf_read_alloc_count; 654 } 655 async->buf_read_alloc_count += nbytes; 656 /* barrier insures read of munge_count occurs before we actually read 657 data out of buffer */ 658 smp_rmb(); 659 return nbytes; 660} 661 662/* transfers control of a chunk from reader to free buffer space */ 663unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes) 664{ 665 /* barrier insures data has been read out of buffer before read count is incremented */ 666 smp_mb(); 667 if ((int)(async->buf_read_count + nbytes - 668 async->buf_read_alloc_count) > 0) { 669 printk("comedi: attempted to read-free more bytes than have been read-allocated.\n"); 670 nbytes = async->buf_read_alloc_count - async->buf_read_count; 671 } 672 async->buf_read_count += nbytes; 673 async->buf_read_ptr += nbytes; 674 async->buf_read_ptr %= async->prealloc_bufsz; 675 return nbytes; 676} 677 678void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset, 679 const void *data, unsigned int num_bytes) 680{ 681 unsigned int write_ptr = async->buf_write_ptr + offset; 682 683 if (write_ptr >= async->prealloc_bufsz) 684 write_ptr %= async->prealloc_bufsz; 685 686 while (num_bytes) { 687 unsigned int block_size; 688 689 if (write_ptr + num_bytes > async->prealloc_bufsz) 690 block_size = async->prealloc_bufsz - write_ptr; 691 else 692 block_size = num_bytes; 693 694 memcpy(async->prealloc_buf + write_ptr, data, block_size); 695 696 data += block_size; 697 num_bytes -= block_size; 698 699 write_ptr = 0; 700 } 701} 702 703void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset, 704 void *dest, unsigned int nbytes) 705{ 706 void *src; 707 unsigned int read_ptr = async->buf_read_ptr + offset; 708 709 if (read_ptr >= async->prealloc_bufsz) 710 read_ptr %= async->prealloc_bufsz; 711 712 while (nbytes) { 713 unsigned int block_size; 714 715 src = async->prealloc_buf + read_ptr; 716 717 if (nbytes >= async->prealloc_bufsz - read_ptr) 718 block_size = async->prealloc_bufsz - read_ptr; 719 else 720 block_size = nbytes; 721 722 memcpy(dest, src, block_size); 723 nbytes -= block_size; 724 dest += block_size; 725 read_ptr = 0; 726 } 727} 728 729unsigned int comedi_buf_read_n_available(struct comedi_async *async) 730{ 731 unsigned num_bytes; 732 733 if (async == NULL) 734 return 0; 735 num_bytes = async->munge_count - async->buf_read_count; 736 /* barrier insures the read of munge_count in this 737 query occurs before any following reads of the buffer which 738 might be based on the return value from this query. 739 */ 740 smp_rmb(); 741 return num_bytes; 742} 743 744int comedi_buf_get(struct comedi_async *async, short *x) 745{ 746 unsigned int n = comedi_buf_read_n_available(async); 747 748 if (n < sizeof(short)) 749 return 0; 750 comedi_buf_read_alloc(async, sizeof(short)); 751 *x = *(short *) (async->prealloc_buf + async->buf_read_ptr); 752 comedi_buf_read_free(async, sizeof(short)); 753 return 1; 754} 755 756int comedi_buf_put(struct comedi_async *async, short x) 757{ 758 unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(short)); 759 760 if (n < sizeof(short)) { 761 async->events |= COMEDI_CB_ERROR; 762 return 0; 763 } 764 *(short *) (async->prealloc_buf + async->buf_write_ptr) = x; 765 comedi_buf_write_free(async, sizeof(short)); 766 return 1; 767} 768 769void comedi_reset_async_buf(struct comedi_async *async) 770{ 771 async->buf_write_alloc_count = 0; 772 async->buf_write_count = 0; 773 async->buf_read_alloc_count = 0; 774 async->buf_read_count = 0; 775 776 async->buf_write_ptr = 0; 777 async->buf_read_ptr = 0; 778 779 async->cur_chan = 0; 780 async->scan_progress = 0; 781 async->munge_chan = 0; 782 async->munge_count = 0; 783 async->munge_ptr = 0; 784 785 async->events = 0; 786} 787 788int comedi_auto_config(struct device *hardware_device, const char *board_name, const int *options, unsigned num_options) 789{ 790 struct comedi_devconfig it; 791 int minor; 792 struct comedi_device_file_info *dev_file_info; 793 int retval; 794 unsigned *private_data = NULL; 795 796 if (!comedi_autoconfig) { 797 dev_set_drvdata(hardware_device, NULL); 798 return 0; 799 } 800 801 minor = comedi_alloc_board_minor(hardware_device); 802 if (minor < 0) return minor; 803 804 private_data = kmalloc(sizeof(unsigned), GFP_KERNEL); 805 if (private_data == NULL) { 806 retval = -ENOMEM; 807 goto cleanup; 808 } 809 *private_data = minor; 810 dev_set_drvdata(hardware_device, private_data); 811 812 dev_file_info = comedi_get_device_file_info(minor); 813 814 memset(&it, 0, sizeof(it)); 815 strncpy(it.board_name, board_name, COMEDI_NAMELEN); 816 it.board_name[COMEDI_NAMELEN - 1] = '\0'; 817 BUG_ON(num_options > COMEDI_NDEVCONFOPTS); 818 memcpy(it.options, options, num_options * sizeof(int)); 819 820 mutex_lock(&dev_file_info->device->mutex); 821 retval = comedi_device_attach(dev_file_info->device, &it); 822 mutex_unlock(&dev_file_info->device->mutex); 823 824cleanup: 825 if (retval < 0) 826 { 827 kfree(private_data); 828 comedi_free_board_minor(minor); 829 } 830 return retval; 831} 832 833void comedi_auto_unconfig(struct device *hardware_device) 834{ 835 unsigned *minor = (unsigned *)dev_get_drvdata(hardware_device); 836 if (minor == NULL) return; 837 838 BUG_ON(*minor >= COMEDI_NUM_BOARD_MINORS); 839 840 comedi_free_board_minor(*minor); 841 dev_set_drvdata(hardware_device, NULL); 842 kfree(minor); 843} 844 845int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) 846{ 847 int options[2]; 848 849 /* pci bus */ 850 options[0] = pcidev->bus->number; 851 /* pci slot */ 852 options[1] = PCI_SLOT(pcidev->devfn); 853 854 return comedi_auto_config(&pcidev->dev, board_name, 855 options, ARRAY_SIZE(options)); 856} 857 858void comedi_pci_auto_unconfig(struct pci_dev *pcidev) 859{ 860 comedi_auto_unconfig(&pcidev->dev); 861} 862 863int comedi_usb_auto_config(struct usb_device *usbdev, 864 const char *board_name) 865{ 866 BUG_ON(usbdev == NULL); 867 return comedi_auto_config(&usbdev->dev, board_name, NULL, 0); 868} 869 870void comedi_usb_auto_unconfig(struct usb_device *usbdev) 871{ 872 BUG_ON(usbdev == NULL); 873 comedi_auto_unconfig(&usbdev->dev); 874} 875