1 /* 2 * Copyright (C) 2013 - Virtual Open Systems 3 * Author: Antonios Motakis <a.motakis@virtualopensystems.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License, version 2, as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #define dev_fmt(fmt) "VFIO: " fmt 16 17 #include <linux/device.h> 18 #include <linux/acpi.h> 19 #include <linux/iommu.h> 20 #include <linux/module.h> 21 #include <linux/mutex.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/slab.h> 24 #include <linux/types.h> 25 #include <linux/uaccess.h> 26 #include <linux/vfio.h> 27 28 #include "vfio_platform_private.h" 29 30 #define DRIVER_VERSION "0.10" 31 #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" 32 #define DRIVER_DESC "VFIO platform base module" 33 34 #define VFIO_PLATFORM_IS_ACPI(vdev) ((vdev)->acpihid != NULL) 35 36 static LIST_HEAD(reset_list); 37 static DEFINE_MUTEX(driver_lock); 38 39 static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, 40 struct module **module) 41 { 42 struct vfio_platform_reset_node *iter; 43 vfio_platform_reset_fn_t reset_fn = NULL; 44 45 mutex_lock(&driver_lock); 46 list_for_each_entry(iter, &reset_list, link) { 47 if (!strcmp(iter->compat, compat) && 48 try_module_get(iter->owner)) { 49 *module = iter->owner; 50 reset_fn = iter->of_reset; 51 break; 52 } 53 } 54 mutex_unlock(&driver_lock); 55 return reset_fn; 56 } 57 58 static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, 59 struct device *dev) 60 { 61 struct acpi_device *adev; 62 63 if (acpi_disabled) 64 return -ENOENT; 65 66 adev = ACPI_COMPANION(dev); 67 if (!adev) { 68 dev_err(dev, "ACPI companion device not found for %s\n", 69 vdev->name); 70 return -ENODEV; 71 } 72 73 #ifdef CONFIG_ACPI 74 vdev->acpihid = acpi_device_hid(adev); 75 #endif 76 return WARN_ON(!vdev->acpihid) ? -EINVAL : 0; 77 } 78 79 static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev, 80 const char **extra_dbg) 81 { 82 #ifdef CONFIG_ACPI 83 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 84 struct device *dev = vdev->device; 85 acpi_handle handle = ACPI_HANDLE(dev); 86 acpi_status acpi_ret; 87 88 acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer); 89 if (ACPI_FAILURE(acpi_ret)) { 90 if (extra_dbg) 91 *extra_dbg = acpi_format_exception(acpi_ret); 92 return -EINVAL; 93 } 94 95 return 0; 96 #else 97 return -ENOENT; 98 #endif 99 } 100 101 static bool vfio_platform_acpi_has_reset(struct vfio_platform_device *vdev) 102 { 103 #ifdef CONFIG_ACPI 104 struct device *dev = vdev->device; 105 acpi_handle handle = ACPI_HANDLE(dev); 106 107 return acpi_has_method(handle, "_RST"); 108 #else 109 return false; 110 #endif 111 } 112 113 static bool vfio_platform_has_reset(struct vfio_platform_device *vdev) 114 { 115 if (VFIO_PLATFORM_IS_ACPI(vdev)) 116 return vfio_platform_acpi_has_reset(vdev); 117 118 return vdev->of_reset ? true : false; 119 } 120 121 static int vfio_platform_get_reset(struct vfio_platform_device *vdev) 122 { 123 if (VFIO_PLATFORM_IS_ACPI(vdev)) 124 return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT; 125 126 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, 127 &vdev->reset_module); 128 if (!vdev->of_reset) { 129 request_module("vfio-reset:%s", vdev->compat); 130 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, 131 &vdev->reset_module); 132 } 133 134 return vdev->of_reset ? 0 : -ENOENT; 135 } 136 137 static void vfio_platform_put_reset(struct vfio_platform_device *vdev) 138 { 139 if (VFIO_PLATFORM_IS_ACPI(vdev)) 140 return; 141 142 if (vdev->of_reset) 143 module_put(vdev->reset_module); 144 } 145 146 static int vfio_platform_regions_init(struct vfio_platform_device *vdev) 147 { 148 int cnt = 0, i; 149 150 while (vdev->get_resource(vdev, cnt)) 151 cnt++; 152 153 vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region), 154 GFP_KERNEL); 155 if (!vdev->regions) 156 return -ENOMEM; 157 158 for (i = 0; i < cnt; i++) { 159 struct resource *res = 160 vdev->get_resource(vdev, i); 161 162 if (!res) 163 goto err; 164 165 vdev->regions[i].addr = res->start; 166 vdev->regions[i].size = resource_size(res); 167 vdev->regions[i].flags = 0; 168 169 switch (resource_type(res)) { 170 case IORESOURCE_MEM: 171 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO; 172 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; 173 if (!(res->flags & IORESOURCE_READONLY)) 174 vdev->regions[i].flags |= 175 VFIO_REGION_INFO_FLAG_WRITE; 176 177 /* 178 * Only regions addressed with PAGE granularity may be 179 * MMAPed securely. 180 */ 181 if (!(vdev->regions[i].addr & ~PAGE_MASK) && 182 !(vdev->regions[i].size & ~PAGE_MASK)) 183 vdev->regions[i].flags |= 184 VFIO_REGION_INFO_FLAG_MMAP; 185 186 break; 187 case IORESOURCE_IO: 188 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO; 189 break; 190 default: 191 goto err; 192 } 193 } 194 195 vdev->num_regions = cnt; 196 197 return 0; 198 err: 199 kfree(vdev->regions); 200 return -EINVAL; 201 } 202 203 static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev) 204 { 205 int i; 206 207 for (i = 0; i < vdev->num_regions; i++) 208 iounmap(vdev->regions[i].ioaddr); 209 210 vdev->num_regions = 0; 211 kfree(vdev->regions); 212 } 213 214 static int vfio_platform_call_reset(struct vfio_platform_device *vdev, 215 const char **extra_dbg) 216 { 217 if (VFIO_PLATFORM_IS_ACPI(vdev)) { 218 dev_info(vdev->device, "reset\n"); 219 return vfio_platform_acpi_call_reset(vdev, extra_dbg); 220 } else if (vdev->of_reset) { 221 dev_info(vdev->device, "reset\n"); 222 return vdev->of_reset(vdev); 223 } 224 225 dev_warn(vdev->device, "no reset function found!\n"); 226 return -EINVAL; 227 } 228 229 static void vfio_platform_release(void *device_data) 230 { 231 struct vfio_platform_device *vdev = device_data; 232 233 mutex_lock(&driver_lock); 234 235 if (!(--vdev->refcnt)) { 236 const char *extra_dbg = NULL; 237 int ret; 238 239 ret = vfio_platform_call_reset(vdev, &extra_dbg); 240 if (ret && vdev->reset_required) { 241 dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n", 242 ret, extra_dbg ? extra_dbg : ""); 243 WARN_ON(1); 244 } 245 pm_runtime_put(vdev->device); 246 vfio_platform_regions_cleanup(vdev); 247 vfio_platform_irq_cleanup(vdev); 248 } 249 250 mutex_unlock(&driver_lock); 251 252 module_put(vdev->parent_module); 253 } 254 255 static int vfio_platform_open(void *device_data) 256 { 257 struct vfio_platform_device *vdev = device_data; 258 int ret; 259 260 if (!try_module_get(vdev->parent_module)) 261 return -ENODEV; 262 263 mutex_lock(&driver_lock); 264 265 if (!vdev->refcnt) { 266 const char *extra_dbg = NULL; 267 268 ret = vfio_platform_regions_init(vdev); 269 if (ret) 270 goto err_reg; 271 272 ret = vfio_platform_irq_init(vdev); 273 if (ret) 274 goto err_irq; 275 276 ret = pm_runtime_get_sync(vdev->device); 277 if (ret < 0) 278 goto err_pm; 279 280 ret = vfio_platform_call_reset(vdev, &extra_dbg); 281 if (ret && vdev->reset_required) { 282 dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n", 283 ret, extra_dbg ? extra_dbg : ""); 284 goto err_rst; 285 } 286 } 287 288 vdev->refcnt++; 289 290 mutex_unlock(&driver_lock); 291 return 0; 292 293 err_rst: 294 pm_runtime_put(vdev->device); 295 err_pm: 296 vfio_platform_irq_cleanup(vdev); 297 err_irq: 298 vfio_platform_regions_cleanup(vdev); 299 err_reg: 300 mutex_unlock(&driver_lock); 301 module_put(THIS_MODULE); 302 return ret; 303 } 304 305 static long vfio_platform_ioctl(void *device_data, 306 unsigned int cmd, unsigned long arg) 307 { 308 struct vfio_platform_device *vdev = device_data; 309 unsigned long minsz; 310 311 if (cmd == VFIO_DEVICE_GET_INFO) { 312 struct vfio_device_info info; 313 314 minsz = offsetofend(struct vfio_device_info, num_irqs); 315 316 if (copy_from_user(&info, (void __user *)arg, minsz)) 317 return -EFAULT; 318 319 if (info.argsz < minsz) 320 return -EINVAL; 321 322 if (vfio_platform_has_reset(vdev)) 323 vdev->flags |= VFIO_DEVICE_FLAGS_RESET; 324 info.flags = vdev->flags; 325 info.num_regions = vdev->num_regions; 326 info.num_irqs = vdev->num_irqs; 327 328 return copy_to_user((void __user *)arg, &info, minsz) ? 329 -EFAULT : 0; 330 331 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 332 struct vfio_region_info info; 333 334 minsz = offsetofend(struct vfio_region_info, offset); 335 336 if (copy_from_user(&info, (void __user *)arg, minsz)) 337 return -EFAULT; 338 339 if (info.argsz < minsz) 340 return -EINVAL; 341 342 if (info.index >= vdev->num_regions) 343 return -EINVAL; 344 345 /* map offset to the physical address */ 346 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); 347 info.size = vdev->regions[info.index].size; 348 info.flags = vdev->regions[info.index].flags; 349 350 return copy_to_user((void __user *)arg, &info, minsz) ? 351 -EFAULT : 0; 352 353 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 354 struct vfio_irq_info info; 355 356 minsz = offsetofend(struct vfio_irq_info, count); 357 358 if (copy_from_user(&info, (void __user *)arg, minsz)) 359 return -EFAULT; 360 361 if (info.argsz < minsz) 362 return -EINVAL; 363 364 if (info.index >= vdev->num_irqs) 365 return -EINVAL; 366 367 info.flags = vdev->irqs[info.index].flags; 368 info.count = vdev->irqs[info.index].count; 369 370 return copy_to_user((void __user *)arg, &info, minsz) ? 371 -EFAULT : 0; 372 373 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 374 struct vfio_irq_set hdr; 375 u8 *data = NULL; 376 int ret = 0; 377 size_t data_size = 0; 378 379 minsz = offsetofend(struct vfio_irq_set, count); 380 381 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 382 return -EFAULT; 383 384 ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs, 385 vdev->num_irqs, &data_size); 386 if (ret) 387 return ret; 388 389 if (data_size) { 390 data = memdup_user((void __user *)(arg + minsz), 391 data_size); 392 if (IS_ERR(data)) 393 return PTR_ERR(data); 394 } 395 396 mutex_lock(&vdev->igate); 397 398 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 399 hdr.start, hdr.count, data); 400 mutex_unlock(&vdev->igate); 401 kfree(data); 402 403 return ret; 404 405 } else if (cmd == VFIO_DEVICE_RESET) { 406 return vfio_platform_call_reset(vdev, NULL); 407 } 408 409 return -ENOTTY; 410 } 411 412 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg, 413 char __user *buf, size_t count, 414 loff_t off) 415 { 416 unsigned int done = 0; 417 418 if (!reg->ioaddr) { 419 reg->ioaddr = 420 ioremap_nocache(reg->addr, reg->size); 421 422 if (!reg->ioaddr) 423 return -ENOMEM; 424 } 425 426 while (count) { 427 size_t filled; 428 429 if (count >= 4 && !(off % 4)) { 430 u32 val; 431 432 val = ioread32(reg->ioaddr + off); 433 if (copy_to_user(buf, &val, 4)) 434 goto err; 435 436 filled = 4; 437 } else if (count >= 2 && !(off % 2)) { 438 u16 val; 439 440 val = ioread16(reg->ioaddr + off); 441 if (copy_to_user(buf, &val, 2)) 442 goto err; 443 444 filled = 2; 445 } else { 446 u8 val; 447 448 val = ioread8(reg->ioaddr + off); 449 if (copy_to_user(buf, &val, 1)) 450 goto err; 451 452 filled = 1; 453 } 454 455 456 count -= filled; 457 done += filled; 458 off += filled; 459 buf += filled; 460 } 461 462 return done; 463 err: 464 return -EFAULT; 465 } 466 467 static ssize_t vfio_platform_read(void *device_data, char __user *buf, 468 size_t count, loff_t *ppos) 469 { 470 struct vfio_platform_device *vdev = device_data; 471 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); 472 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; 473 474 if (index >= vdev->num_regions) 475 return -EINVAL; 476 477 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) 478 return -EINVAL; 479 480 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) 481 return vfio_platform_read_mmio(&vdev->regions[index], 482 buf, count, off); 483 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) 484 return -EINVAL; /* not implemented */ 485 486 return -EINVAL; 487 } 488 489 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg, 490 const char __user *buf, size_t count, 491 loff_t off) 492 { 493 unsigned int done = 0; 494 495 if (!reg->ioaddr) { 496 reg->ioaddr = 497 ioremap_nocache(reg->addr, reg->size); 498 499 if (!reg->ioaddr) 500 return -ENOMEM; 501 } 502 503 while (count) { 504 size_t filled; 505 506 if (count >= 4 && !(off % 4)) { 507 u32 val; 508 509 if (copy_from_user(&val, buf, 4)) 510 goto err; 511 iowrite32(val, reg->ioaddr + off); 512 513 filled = 4; 514 } else if (count >= 2 && !(off % 2)) { 515 u16 val; 516 517 if (copy_from_user(&val, buf, 2)) 518 goto err; 519 iowrite16(val, reg->ioaddr + off); 520 521 filled = 2; 522 } else { 523 u8 val; 524 525 if (copy_from_user(&val, buf, 1)) 526 goto err; 527 iowrite8(val, reg->ioaddr + off); 528 529 filled = 1; 530 } 531 532 count -= filled; 533 done += filled; 534 off += filled; 535 buf += filled; 536 } 537 538 return done; 539 err: 540 return -EFAULT; 541 } 542 543 static ssize_t vfio_platform_write(void *device_data, const char __user *buf, 544 size_t count, loff_t *ppos) 545 { 546 struct vfio_platform_device *vdev = device_data; 547 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); 548 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; 549 550 if (index >= vdev->num_regions) 551 return -EINVAL; 552 553 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) 554 return -EINVAL; 555 556 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) 557 return vfio_platform_write_mmio(&vdev->regions[index], 558 buf, count, off); 559 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) 560 return -EINVAL; /* not implemented */ 561 562 return -EINVAL; 563 } 564 565 static int vfio_platform_mmap_mmio(struct vfio_platform_region region, 566 struct vm_area_struct *vma) 567 { 568 u64 req_len, pgoff, req_start; 569 570 req_len = vma->vm_end - vma->vm_start; 571 pgoff = vma->vm_pgoff & 572 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 573 req_start = pgoff << PAGE_SHIFT; 574 575 if (region.size < PAGE_SIZE || req_start + req_len > region.size) 576 return -EINVAL; 577 578 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 579 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; 580 581 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 582 req_len, vma->vm_page_prot); 583 } 584 585 static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma) 586 { 587 struct vfio_platform_device *vdev = device_data; 588 unsigned int index; 589 590 index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT); 591 592 if (vma->vm_end < vma->vm_start) 593 return -EINVAL; 594 if (!(vma->vm_flags & VM_SHARED)) 595 return -EINVAL; 596 if (index >= vdev->num_regions) 597 return -EINVAL; 598 if (vma->vm_start & ~PAGE_MASK) 599 return -EINVAL; 600 if (vma->vm_end & ~PAGE_MASK) 601 return -EINVAL; 602 603 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) 604 return -EINVAL; 605 606 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) 607 && (vma->vm_flags & VM_READ)) 608 return -EINVAL; 609 610 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) 611 && (vma->vm_flags & VM_WRITE)) 612 return -EINVAL; 613 614 vma->vm_private_data = vdev; 615 616 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) 617 return vfio_platform_mmap_mmio(vdev->regions[index], vma); 618 619 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) 620 return -EINVAL; /* not implemented */ 621 622 return -EINVAL; 623 } 624 625 static const struct vfio_device_ops vfio_platform_ops = { 626 .name = "vfio-platform", 627 .open = vfio_platform_open, 628 .release = vfio_platform_release, 629 .ioctl = vfio_platform_ioctl, 630 .read = vfio_platform_read, 631 .write = vfio_platform_write, 632 .mmap = vfio_platform_mmap, 633 }; 634 635 static int vfio_platform_of_probe(struct vfio_platform_device *vdev, 636 struct device *dev) 637 { 638 int ret; 639 640 ret = device_property_read_string(dev, "compatible", 641 &vdev->compat); 642 if (ret) 643 dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name); 644 645 return ret; 646 } 647 648 /* 649 * There can be two kernel build combinations. One build where 650 * ACPI is not selected in Kconfig and another one with the ACPI Kconfig. 651 * 652 * In the first case, vfio_platform_acpi_probe will return since 653 * acpi_disabled is 1. DT user will not see any kind of messages from 654 * ACPI. 655 * 656 * In the second case, both DT and ACPI is compiled in but the system is 657 * booting with any of these combinations. 658 * 659 * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine 660 * terminates immediately without any messages. 661 * 662 * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are 663 * valid checks. We cannot claim that this system is DT. 664 */ 665 int vfio_platform_probe_common(struct vfio_platform_device *vdev, 666 struct device *dev) 667 { 668 struct iommu_group *group; 669 int ret; 670 671 if (!vdev) 672 return -EINVAL; 673 674 ret = vfio_platform_acpi_probe(vdev, dev); 675 if (ret) 676 ret = vfio_platform_of_probe(vdev, dev); 677 678 if (ret) 679 return ret; 680 681 vdev->device = dev; 682 683 ret = vfio_platform_get_reset(vdev); 684 if (ret && vdev->reset_required) { 685 dev_err(dev, "No reset function found for device %s\n", 686 vdev->name); 687 return ret; 688 } 689 690 group = vfio_iommu_group_get(dev); 691 if (!group) { 692 dev_err(dev, "No IOMMU group for device %s\n", vdev->name); 693 ret = -EINVAL; 694 goto put_reset; 695 } 696 697 ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev); 698 if (ret) 699 goto put_iommu; 700 701 mutex_init(&vdev->igate); 702 703 pm_runtime_enable(vdev->device); 704 return 0; 705 706 put_iommu: 707 vfio_iommu_group_put(group, dev); 708 put_reset: 709 vfio_platform_put_reset(vdev); 710 return ret; 711 } 712 EXPORT_SYMBOL_GPL(vfio_platform_probe_common); 713 714 struct vfio_platform_device *vfio_platform_remove_common(struct device *dev) 715 { 716 struct vfio_platform_device *vdev; 717 718 vdev = vfio_del_group_dev(dev); 719 720 if (vdev) { 721 pm_runtime_disable(vdev->device); 722 vfio_platform_put_reset(vdev); 723 vfio_iommu_group_put(dev->iommu_group, dev); 724 } 725 726 return vdev; 727 } 728 EXPORT_SYMBOL_GPL(vfio_platform_remove_common); 729 730 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node) 731 { 732 mutex_lock(&driver_lock); 733 list_add(&node->link, &reset_list); 734 mutex_unlock(&driver_lock); 735 } 736 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset); 737 738 void vfio_platform_unregister_reset(const char *compat, 739 vfio_platform_reset_fn_t fn) 740 { 741 struct vfio_platform_reset_node *iter, *temp; 742 743 mutex_lock(&driver_lock); 744 list_for_each_entry_safe(iter, temp, &reset_list, link) { 745 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) { 746 list_del(&iter->link); 747 break; 748 } 749 } 750 751 mutex_unlock(&driver_lock); 752 753 } 754 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset); 755 756 MODULE_VERSION(DRIVER_VERSION); 757 MODULE_LICENSE("GPL v2"); 758 MODULE_AUTHOR(DRIVER_AUTHOR); 759 MODULE_DESCRIPTION(DRIVER_DESC); 760