drivers.c revision e473e9120b0a2d7252aca1ed9db5adadee36c0fa
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(comedi_device *dev); 51static int insn_rw_emulate_bits(comedi_device *dev, comedi_subdevice *s, 52 comedi_insn *insn, lsampl_t *data); 53static void *comedi_recognize(comedi_driver * driv, const char *name); 54static void comedi_report_boards(comedi_driver *driv); 55static int poll_invalid(comedi_device *dev, comedi_subdevice *s); 56int comedi_buf_alloc(comedi_device *dev, comedi_subdevice *s, 57 unsigned long new_size); 58 59comedi_driver *comedi_drivers; 60 61int comedi_modprobe(int minor) 62{ 63 return -EINVAL; 64} 65 66static void cleanup_device(comedi_device *dev) 67{ 68 int i; 69 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 if (dev->private) { 85 kfree(dev->private); 86 dev->private = NULL; 87 } 88 dev->driver = 0; 89 dev->board_name = NULL; 90 dev->board_ptr = NULL; 91 dev->iobase = 0; 92 dev->irq = 0; 93 dev->read_subdev = NULL; 94 dev->write_subdev = NULL; 95 dev->open = NULL; 96 dev->close = NULL; 97 comedi_set_hw_dev(dev, NULL); 98} 99 100static void __comedi_device_detach(comedi_device *dev) 101{ 102 dev->attached = 0; 103 if (dev->driver) { 104 dev->driver->detach(dev); 105 } else { 106 printk("BUG: dev->driver=NULL in comedi_device_detach()\n"); 107 } 108 cleanup_device(dev); 109} 110 111void comedi_device_detach(comedi_device *dev) 112{ 113 if (!dev->attached) 114 return; 115 __comedi_device_detach(dev); 116} 117 118int comedi_device_attach(comedi_device *dev, comedi_devconfig *it) 119{ 120 comedi_driver *driv; 121 int ret; 122 123 if (dev->attached) 124 return -EBUSY; 125 126 for (driv = comedi_drivers; driv; driv = driv->next) { 127 if (!try_module_get(driv->module)) { 128 printk("comedi: failed to increment module count, skipping\n"); 129 continue; 130 } 131 if (driv->num_names) { 132 dev->board_ptr = comedi_recognize(driv, it->board_name); 133 if (dev->board_ptr == NULL) { 134 module_put(driv->module); 135 continue; 136 } 137 } else { 138 if (strcmp(driv->driver_name, it->board_name)) { 139 module_put(driv->module); 140 continue; 141 } 142 } 143 /* initialize dev->driver here so comedi_error() can be called from attach */ 144 dev->driver = driv; 145 ret = driv->attach(dev, it); 146 if (ret < 0) { 147 module_put(dev->driver->module); 148 __comedi_device_detach(dev); 149 return ret; 150 } 151 goto attached; 152 } 153 154 /* recognize has failed if we get here */ 155 /* report valid board names before returning error */ 156 for (driv = comedi_drivers; driv; driv = driv->next) { 157 if (!try_module_get(driv->module)) { 158 printk("comedi: failed to increment module count\n"); 159 continue; 160 } 161 comedi_report_boards(driv); 162 module_put(driv->module); 163 } 164 return -EIO; 165 166attached: 167 /* do a little post-config cleanup */ 168 ret = postconfig(dev); 169 module_put(dev->driver->module); 170 if (ret < 0) { 171 __comedi_device_detach(dev); 172 return ret; 173 } 174 175 if (!dev->board_name) { 176 printk("BUG: dev->board_name=<%p>\n", dev->board_name); 177 dev->board_name = "BUG"; 178 } 179 smp_wmb(); 180 dev->attached = 1; 181 182 return 0; 183} 184 185int comedi_driver_register(comedi_driver *driver) 186{ 187 driver->next = comedi_drivers; 188 comedi_drivers = driver; 189 190 return 0; 191} 192 193int comedi_driver_unregister(comedi_driver *driver) 194{ 195 comedi_driver *prev; 196 int i; 197 198 /* check for devices using this driver */ 199 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { 200 struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(i); 201 comedi_device *dev; 202 203 if(dev_file_info == NULL) continue; 204 dev = dev_file_info->device; 205 206 mutex_lock(&dev->mutex); 207 if (dev->attached && dev->driver == driver) { 208 if (dev->use_count) 209 printk("BUG! detaching device with use_count=%d\n", dev->use_count); 210 comedi_device_detach(dev); 211 } 212 mutex_unlock(&dev->mutex); 213 } 214 215 if (comedi_drivers == driver) { 216 comedi_drivers = driver->next; 217 return 0; 218 } 219 220 for (prev = comedi_drivers; prev->next; prev = prev->next) { 221 if (prev->next == driver) { 222 prev->next = driver->next; 223 return 0; 224 } 225 } 226 return -EINVAL; 227} 228 229static int postconfig(comedi_device *dev) 230{ 231 int i; 232 comedi_subdevice *s; 233 comedi_async *async = NULL; 234 int ret; 235 236 for (i = 0; i < dev->n_subdevices; i++) { 237 s = dev->subdevices + i; 238 239 if (s->type == COMEDI_SUBD_UNUSED) 240 continue; 241 242 if (s->len_chanlist == 0) 243 s->len_chanlist = 1; 244 245 if (s->do_cmd) { 246 BUG_ON((s->subdev_flags & (SDF_CMD_READ | 247 SDF_CMD_WRITE)) == 0); 248 BUG_ON(!s->do_cmdtest); 249 250 async = kzalloc(sizeof(comedi_async), GFP_KERNEL); 251 if (async == NULL) { 252 printk("failed to allocate async struct\n"); 253 return -ENOMEM; 254 } 255 init_waitqueue_head(&async->wait_head); 256 async->subdevice = s; 257 s->async = async; 258 259#define DEFAULT_BUF_MAXSIZE (64*1024) 260#define DEFAULT_BUF_SIZE (64*1024) 261 262 async->max_bufsize = DEFAULT_BUF_MAXSIZE; 263 264 async->prealloc_buf = NULL; 265 async->prealloc_bufsz = 0; 266 if (comedi_buf_alloc(dev, s, DEFAULT_BUF_SIZE) < 0) { 267 printk("Buffer allocation failed\n"); 268 return -ENOMEM; 269 } 270 if (s->buf_change) { 271 ret = s->buf_change(dev, s, DEFAULT_BUF_SIZE); 272 if (ret < 0) 273 return ret; 274 } 275 comedi_alloc_subdevice_minor(dev, s); 276 } 277 278 if (!s->range_table && !s->range_table_list) 279 s->range_table = &range_unknown; 280 281 if (!s->insn_read && s->insn_bits) 282 s->insn_read = insn_rw_emulate_bits; 283 if (!s->insn_write && s->insn_bits) 284 s->insn_write = insn_rw_emulate_bits; 285 286 if (!s->insn_read) 287 s->insn_read = insn_inval; 288 if (!s->insn_write) 289 s->insn_write = insn_inval; 290 if (!s->insn_bits) 291 s->insn_bits = insn_inval; 292 if (!s->insn_config) 293 s->insn_config = insn_inval; 294 295 if (!s->poll) 296 s->poll = poll_invalid; 297 } 298 299 return 0; 300} 301 302/* generic recognize function for drivers that register their supported board names */ 303void *comedi_recognize(comedi_driver * driv, const char *name) 304{ 305 unsigned i; 306 const char *const *name_ptr = driv->board_name; 307 for (i = 0; i < driv->num_names; i++) { 308 if (strcmp(*name_ptr, name) == 0) 309 return (void *)name_ptr; 310 name_ptr = 311 (const char *const *)((const char *)name_ptr + 312 driv->offset); 313 } 314 315 return NULL; 316} 317 318void comedi_report_boards(comedi_driver *driv) 319{ 320 unsigned int i; 321 const char *const *name_ptr; 322 323 printk("comedi: valid board names for %s driver are:\n", 324 driv->driver_name); 325 326 name_ptr = driv->board_name; 327 for (i = 0; i < driv->num_names; i++) { 328 printk(" %s\n", *name_ptr); 329 name_ptr = (const char **)((char *)name_ptr + driv->offset); 330 } 331 332 if (driv->num_names == 0) 333 printk(" %s\n", driv->driver_name); 334} 335 336static int poll_invalid(comedi_device *dev, comedi_subdevice *s) 337{ 338 return -EINVAL; 339} 340 341int insn_inval(comedi_device *dev, comedi_subdevice *s, 342 comedi_insn *insn, lsampl_t *data) 343{ 344 return -EINVAL; 345} 346 347static int insn_rw_emulate_bits(comedi_device *dev, comedi_subdevice *s, 348 comedi_insn *insn, lsampl_t *data) 349{ 350 comedi_insn new_insn; 351 int ret; 352 static const unsigned channels_per_bitfield = 32; 353 354 unsigned chan = CR_CHAN(insn->chanspec); 355 const unsigned base_bitfield_channel = 356 (chan < channels_per_bitfield) ? 0 : chan; 357 lsampl_t new_data[2]; 358 memset(new_data, 0, sizeof(new_data)); 359 memset(&new_insn, 0, sizeof(new_insn)); 360 new_insn.insn = INSN_BITS; 361 new_insn.chanspec = base_bitfield_channel; 362 new_insn.n = 2; 363 new_insn.data = new_data; 364 new_insn.subdev = insn->subdev; 365 366 if (insn->insn == INSN_WRITE) { 367 if (!(s->subdev_flags & SDF_WRITABLE)) 368 return -EINVAL; 369 new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ 370 new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) : 0; /* bits */ 371 } 372 373 ret = s->insn_bits(dev, s, &new_insn, new_data); 374 if (ret < 0) 375 return ret; 376 377 if (insn->insn == INSN_READ) { 378 data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; 379 } 380 381 return 1; 382} 383 384static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr) 385{ 386 unsigned long ret = 0UL; 387 pmd_t *pmd; 388 pte_t *ptep, pte; 389 pud_t *pud; 390 391 if (!pgd_none(*pgd)) { 392 pud = pud_offset(pgd, adr); 393 pmd = pmd_offset(pud, adr); 394 if (!pmd_none(*pmd)) { 395 ptep = pte_offset_kernel(pmd, adr); 396 pte = *ptep; 397 if (pte_present(pte)) { 398 ret = (unsigned long) 399 page_address(pte_page(pte)); 400 ret |= (adr & (PAGE_SIZE - 1)); 401 } 402 } 403 } 404 return ret; 405} 406 407static inline unsigned long kvirt_to_kva(unsigned long adr) 408{ 409 unsigned long va, kva; 410 411 va = adr; 412 kva = uvirt_to_kva(pgd_offset_k(va), va); 413 414 return kva; 415} 416 417int comedi_buf_alloc(comedi_device *dev, comedi_subdevice *s, 418 unsigned long new_size) 419{ 420 comedi_async *async = s->async; 421 422 /* Round up new_size to multiple of PAGE_SIZE */ 423 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; 424 425 /* if no change is required, do nothing */ 426 if (async->prealloc_buf && async->prealloc_bufsz == new_size) { 427 return 0; 428 } 429 /* deallocate old buffer */ 430 if (async->prealloc_buf) { 431 vunmap(async->prealloc_buf); 432 async->prealloc_buf = NULL; 433 async->prealloc_bufsz = 0; 434 } 435 if (async->buf_page_list) { 436 unsigned i; 437 for (i = 0; i < async->n_buf_pages; ++i) { 438 if (async->buf_page_list[i].virt_addr) { 439 mem_map_unreserve(virt_to_page(async-> 440 buf_page_list[i].virt_addr)); 441 if (s->async_dma_dir != DMA_NONE) { 442 dma_free_coherent(dev->hw_dev, 443 PAGE_SIZE, 444 async->buf_page_list[i]. 445 virt_addr, 446 async->buf_page_list[i]. 447 dma_addr); 448 } else { 449 free_page((unsigned long)async-> 450 buf_page_list[i].virt_addr); 451 } 452 } 453 } 454 vfree(async->buf_page_list); 455 async->buf_page_list = NULL; 456 async->n_buf_pages = 0; 457 } 458 /* allocate new buffer */ 459 if (new_size) { 460 unsigned i = 0; 461 unsigned n_pages = new_size >> PAGE_SHIFT; 462 struct page **pages = NULL; 463 464 async->buf_page_list = 465 vmalloc(sizeof(struct comedi_buf_page) * n_pages); 466 if (async->buf_page_list) { 467 memset(async->buf_page_list, 0, 468 sizeof(struct comedi_buf_page) * n_pages); 469 pages = vmalloc(sizeof(struct page *) * n_pages); 470 } 471 if (pages) { 472 for (i = 0; i < n_pages; i++) { 473 if (s->async_dma_dir != DMA_NONE) { 474 async->buf_page_list[i].virt_addr = 475 dma_alloc_coherent(dev->hw_dev, 476 PAGE_SIZE, 477 &async->buf_page_list[i]. 478 dma_addr, 479 GFP_KERNEL | __GFP_COMP); 480 } else { 481 async->buf_page_list[i].virt_addr = 482 (void *) 483 get_zeroed_page(GFP_KERNEL); 484 } 485 if (async->buf_page_list[i].virt_addr == NULL) { 486 break; 487 } 488 mem_map_reserve(virt_to_page(async-> 489 buf_page_list[i].virt_addr)); 490 pages[i] = 491 virt_to_page(async->buf_page_list[i]. 492 virt_addr); 493 } 494 } 495 if (i == n_pages) { 496 async->prealloc_buf = 497 vmap(pages, n_pages, VM_MAP, 498 PAGE_KERNEL_NOCACHE); 499 } 500 if (pages) { 501 vfree(pages); 502 } 503 if (async->prealloc_buf == NULL) { 504 /* Some allocation failed above. */ 505 if (async->buf_page_list) { 506 for (i = 0; i < n_pages; i++) { 507 if (async->buf_page_list[i].virt_addr == 508 NULL) { 509 break; 510 } 511 mem_map_unreserve(virt_to_page(async-> 512 buf_page_list[i]. 513 virt_addr)); 514 if (s->async_dma_dir != DMA_NONE) { 515 dma_free_coherent(dev->hw_dev, 516 PAGE_SIZE, 517 async->buf_page_list[i]. 518 virt_addr, 519 async->buf_page_list[i]. 520 dma_addr); 521 } else { 522 free_page((unsigned long)async-> 523 buf_page_list[i]. 524 virt_addr); 525 } 526 } 527 vfree(async->buf_page_list); 528 async->buf_page_list = NULL; 529 } 530 return -ENOMEM; 531 } 532 async->n_buf_pages = n_pages; 533 } 534 async->prealloc_bufsz = new_size; 535 536 return 0; 537} 538 539/* munging is applied to data by core as it passes between user 540 * and kernel space */ 541unsigned int comedi_buf_munge(comedi_async *async, unsigned int num_bytes) 542{ 543 comedi_subdevice *s = async->subdevice; 544 unsigned int count = 0; 545 const unsigned num_sample_bytes = bytes_per_sample(s); 546 547 if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) { 548 async->munge_count += num_bytes; 549 if ((int)(async->munge_count - async->buf_write_count) > 0) 550 BUG(); 551 return num_bytes; 552 } 553 /* don't munge partial samples */ 554 num_bytes -= num_bytes % num_sample_bytes; 555 while (count < num_bytes) { 556 int block_size; 557 558 block_size = num_bytes - count; 559 if (block_size < 0) { 560 rt_printk("%s: %s: bug! block_size is negative\n", 561 __FILE__, __func__); 562 break; 563 } 564 if ((int)(async->munge_ptr + block_size - 565 async->prealloc_bufsz) > 0) 566 block_size = async->prealloc_bufsz - async->munge_ptr; 567 568 s->munge(s->device, s, async->prealloc_buf + async->munge_ptr, 569 block_size, async->munge_chan); 570 571 smp_wmb(); /* barrier insures data is munged in buffer before munge_count is incremented */ 572 573 async->munge_chan += block_size / num_sample_bytes; 574 async->munge_chan %= async->cmd.chanlist_len; 575 async->munge_count += block_size; 576 async->munge_ptr += block_size; 577 async->munge_ptr %= async->prealloc_bufsz; 578 count += block_size; 579 } 580 if ((int)(async->munge_count - async->buf_write_count) > 0) 581 BUG(); 582 return count; 583} 584 585unsigned int comedi_buf_write_n_available(comedi_async *async) 586{ 587 unsigned int free_end; 588 unsigned int nbytes; 589 590 if (async == NULL) 591 return 0; 592 593 free_end = async->buf_read_count + async->prealloc_bufsz; 594 nbytes = free_end - async->buf_write_alloc_count; 595 nbytes -= nbytes % bytes_per_sample(async->subdevice); 596 /* barrier insures the read of buf_read_count in this 597 query occurs before any following writes to the buffer which 598 might be based on the return value from this query. 599 */ 600 smp_mb(); 601 return nbytes; 602} 603 604/* allocates chunk for the writer from free buffer space */ 605unsigned int comedi_buf_write_alloc(comedi_async *async, unsigned int nbytes) 606{ 607 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 608 609 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { 610 nbytes = free_end - async->buf_write_alloc_count; 611 } 612 async->buf_write_alloc_count += nbytes; 613 /* barrier insures the read of buf_read_count above occurs before 614 we write data to the write-alloc'ed buffer space */ 615 smp_mb(); 616 return nbytes; 617} 618 619/* allocates nothing unless it can completely fulfill the request */ 620unsigned int comedi_buf_write_alloc_strict(comedi_async *async, 621 unsigned int nbytes) 622{ 623 unsigned int free_end = async->buf_read_count + async->prealloc_bufsz; 624 625 if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) { 626 nbytes = 0; 627 } 628 async->buf_write_alloc_count += nbytes; 629 /* barrier insures the read of buf_read_count above occurs before 630 we write data to the write-alloc'ed buffer space */ 631 smp_mb(); 632 return nbytes; 633} 634 635/* transfers a chunk from writer to filled buffer space */ 636unsigned comedi_buf_write_free(comedi_async *async, unsigned int nbytes) 637{ 638 if ((int)(async->buf_write_count + nbytes - 639 async->buf_write_alloc_count) > 0) { 640 rt_printk 641 ("comedi: attempted to write-free more bytes than have been write-allocated.\n"); 642 nbytes = async->buf_write_alloc_count - async->buf_write_count; 643 } 644 async->buf_write_count += nbytes; 645 async->buf_write_ptr += nbytes; 646 comedi_buf_munge(async, async->buf_write_count - async->munge_count); 647 if (async->buf_write_ptr >= async->prealloc_bufsz) { 648 async->buf_write_ptr %= async->prealloc_bufsz; 649 } 650 return nbytes; 651} 652 653/* allocates a chunk for the reader from filled (and munged) buffer space */ 654unsigned comedi_buf_read_alloc(comedi_async *async, unsigned nbytes) 655{ 656 if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) > 657 0) { 658 nbytes = async->munge_count - async->buf_read_alloc_count; 659 } 660 async->buf_read_alloc_count += nbytes; 661 /* barrier insures read of munge_count occurs before we actually read 662 data out of buffer */ 663 smp_rmb(); 664 return nbytes; 665} 666 667/* transfers control of a chunk from reader to free buffer space */ 668unsigned comedi_buf_read_free(comedi_async *async, unsigned int nbytes) 669{ 670 /* barrier insures data has been read out of buffer before read count is incremented */ 671 smp_mb(); 672 if ((int)(async->buf_read_count + nbytes - 673 async->buf_read_alloc_count) > 0) { 674 rt_printk 675 ("comedi: attempted to read-free more bytes than have been read-allocated.\n"); 676 nbytes = async->buf_read_alloc_count - async->buf_read_count; 677 } 678 async->buf_read_count += nbytes; 679 async->buf_read_ptr += nbytes; 680 async->buf_read_ptr %= async->prealloc_bufsz; 681 return nbytes; 682} 683 684void comedi_buf_memcpy_to(comedi_async *async, unsigned int offset, 685 const void *data, unsigned int num_bytes) 686{ 687 unsigned int write_ptr = async->buf_write_ptr + offset; 688 689 if (write_ptr >= async->prealloc_bufsz) 690 write_ptr %= async->prealloc_bufsz; 691 692 while (num_bytes) { 693 unsigned int block_size; 694 695 if (write_ptr + num_bytes > async->prealloc_bufsz) 696 block_size = async->prealloc_bufsz - write_ptr; 697 else 698 block_size = num_bytes; 699 700 memcpy(async->prealloc_buf + write_ptr, data, block_size); 701 702 data += block_size; 703 num_bytes -= block_size; 704 705 write_ptr = 0; 706 } 707} 708 709void comedi_buf_memcpy_from(comedi_async *async, unsigned int offset, 710 void *dest, unsigned int nbytes) 711{ 712 void *src; 713 unsigned int read_ptr = async->buf_read_ptr + offset; 714 715 if (read_ptr >= async->prealloc_bufsz) 716 read_ptr %= async->prealloc_bufsz; 717 718 while (nbytes) { 719 unsigned int block_size; 720 721 src = async->prealloc_buf + read_ptr; 722 723 if (nbytes >= async->prealloc_bufsz - read_ptr) 724 block_size = async->prealloc_bufsz - read_ptr; 725 else 726 block_size = nbytes; 727 728 memcpy(dest, src, block_size); 729 nbytes -= block_size; 730 dest += block_size; 731 read_ptr = 0; 732 } 733} 734 735unsigned int comedi_buf_read_n_available(comedi_async *async) 736{ 737 unsigned num_bytes; 738 739 if (async == NULL) 740 return 0; 741 num_bytes = async->munge_count - async->buf_read_count; 742 /* barrier insures the read of munge_count in this 743 query occurs before any following reads of the buffer which 744 might be based on the return value from this query. 745 */ 746 smp_rmb(); 747 return num_bytes; 748} 749 750int comedi_buf_get(comedi_async *async, sampl_t *x) 751{ 752 unsigned int n = comedi_buf_read_n_available(async); 753 754 if (n < sizeof(sampl_t)) 755 return 0; 756 comedi_buf_read_alloc(async, sizeof(sampl_t)); 757 *x = *(sampl_t *) (async->prealloc_buf + async->buf_read_ptr); 758 comedi_buf_read_free(async, sizeof(sampl_t)); 759 return 1; 760} 761 762int comedi_buf_put(comedi_async *async, sampl_t x) 763{ 764 unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(sampl_t)); 765 766 if (n < sizeof(sampl_t)) { 767 async->events |= COMEDI_CB_ERROR; 768 return 0; 769 } 770 *(sampl_t *) (async->prealloc_buf + async->buf_write_ptr) = x; 771 comedi_buf_write_free(async, sizeof(sampl_t)); 772 return 1; 773} 774 775void comedi_reset_async_buf(comedi_async *async) 776{ 777 async->buf_write_alloc_count = 0; 778 async->buf_write_count = 0; 779 async->buf_read_alloc_count = 0; 780 async->buf_read_count = 0; 781 782 async->buf_write_ptr = 0; 783 async->buf_read_ptr = 0; 784 785 async->cur_chan = 0; 786 async->scan_progress = 0; 787 async->munge_chan = 0; 788 async->munge_count = 0; 789 async->munge_ptr = 0; 790 791 async->events = 0; 792} 793 794int comedi_auto_config(struct device *hardware_device, const char *board_name, const int *options, unsigned num_options) 795{ 796 comedi_devconfig it; 797 int minor; 798 struct comedi_device_file_info *dev_file_info; 799 int retval; 800 unsigned *private_data = NULL; 801 802 if (!comedi_autoconfig) { 803 dev_set_drvdata(hardware_device, NULL); 804 return 0; 805 } 806 807 minor = comedi_alloc_board_minor(hardware_device); 808 if(minor < 0) return minor; 809 810 private_data = kmalloc(sizeof(unsigned), GFP_KERNEL); 811 if (private_data == NULL) { 812 retval = -ENOMEM; 813 goto cleanup; 814 } 815 *private_data = minor; 816 dev_set_drvdata(hardware_device, private_data); 817 818 dev_file_info = comedi_get_device_file_info(minor); 819 820 memset(&it, 0, sizeof(it)); 821 strncpy(it.board_name, board_name, COMEDI_NAMELEN); 822 it.board_name[COMEDI_NAMELEN - 1] = '\0'; 823 BUG_ON(num_options > COMEDI_NDEVCONFOPTS); 824 memcpy(it.options, options, num_options * sizeof(int)); 825 826 mutex_lock(&dev_file_info->device->mutex); 827 retval = comedi_device_attach(dev_file_info->device, &it); 828 mutex_unlock(&dev_file_info->device->mutex); 829 830cleanup: 831 if(retval < 0) 832 { 833 kfree(private_data); 834 comedi_free_board_minor(minor); 835 } 836 return retval; 837} 838 839void comedi_auto_unconfig(struct device *hardware_device) 840{ 841 unsigned *minor = (unsigned *)dev_get_drvdata(hardware_device); 842 if(minor == NULL) return; 843 844 BUG_ON(*minor >= COMEDI_NUM_BOARD_MINORS); 845 846 comedi_free_board_minor(*minor); 847 dev_set_drvdata(hardware_device, NULL); 848 kfree(minor); 849} 850 851int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name) 852{ 853 int options[2]; 854 855 /* pci bus */ 856 options[0] = pcidev->bus->number; 857 /* pci slot */ 858 options[1] = PCI_SLOT(pcidev->devfn); 859 860 return comedi_auto_config(&pcidev->dev, board_name, options, sizeof(options) / sizeof(options[0])); 861} 862 863void comedi_pci_auto_unconfig(struct pci_dev *pcidev) 864{ 865 comedi_auto_unconfig(&pcidev->dev); 866} 867 868int comedi_usb_auto_config(struct usb_device *usbdev, 869 const char *board_name) 870{ 871 BUG_ON(usbdev == NULL); 872 return comedi_auto_config(&usbdev->dev, board_name, NULL, 0); 873} 874 875void comedi_usb_auto_unconfig(struct usb_device *usbdev) 876{ 877 BUG_ON(usbdev == NULL); 878 comedi_auto_unconfig(&usbdev->dev); 879} 880