1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 - Virtual Open Systems 4 * Author: Antonios Motakis <a.motakis@virtualopensystems.com> 5 */ 6 7 #define dev_fmt(fmt) "VFIO: " fmt 8 9 #include <linux/device.h> 10 #include <linux/acpi.h> 11 #include <linux/iommu.h> 12 #include <linux/module.h> 13 #include <linux/mutex.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/slab.h> 16 #include <linux/types.h> 17 #include <linux/uaccess.h> 18 #include <linux/vfio.h> 19 20 #include "vfio_platform_private.h" 21 22 #define DRIVER_VERSION "0.10" 23 #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" 24 #define DRIVER_DESC "VFIO platform base module" 25 26 #define VFIO_PLATFORM_IS_ACPI(vdev) ((vdev)->acpihid != NULL) 27 28 static LIST_HEAD(reset_list); 29 static DEFINE_MUTEX(driver_lock); 30 31 static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, 32 struct module **module) 33 { 34 struct vfio_platform_reset_node *iter; 35 vfio_platform_reset_fn_t reset_fn = NULL; 36 37 mutex_lock(&driver_lock); 38 list_for_each_entry(iter, &reset_list, link) { 39 if (!strcmp(iter->compat, compat) && 40 try_module_get(iter->owner)) { 41 *module = iter->owner; 42 reset_fn = iter->of_reset; 43 break; 44 } 45 } 46 mutex_unlock(&driver_lock); 47 return reset_fn; 48 } 49 50 static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, 51 struct device *dev) 52 { 53 struct acpi_device *adev; 54 55 if (acpi_disabled) 56 return -ENOENT; 57 58 adev = ACPI_COMPANION(dev); 59 if (!adev) { 60 dev_err(dev, "ACPI companion device not found for %s\n", 61 vdev->name); 62 return -ENODEV; 63 } 64 65 #ifdef CONFIG_ACPI 66 vdev->acpihid = acpi_device_hid(adev); 67 #endif 68 return WARN_ON(!vdev->acpihid) ? -EINVAL : 0; 69 } 70 71 static int vfio_platform_acpi_call_reset(struct vfio_platform_device *vdev, 72 const char **extra_dbg) 73 { 74 #ifdef CONFIG_ACPI 75 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 76 struct device *dev = vdev->device; 77 acpi_handle handle = ACPI_HANDLE(dev); 78 acpi_status acpi_ret; 79 80 acpi_ret = acpi_evaluate_object(handle, "_RST", NULL, &buffer); 81 if (ACPI_FAILURE(acpi_ret)) { 82 if (extra_dbg) 83 *extra_dbg = acpi_format_exception(acpi_ret); 84 return -EINVAL; 85 } 86 87 return 0; 88 #else 89 return -ENOENT; 90 #endif 91 } 92 93 static bool vfio_platform_acpi_has_reset(struct vfio_platform_device *vdev) 94 { 95 #ifdef CONFIG_ACPI 96 struct device *dev = vdev->device; 97 acpi_handle handle = ACPI_HANDLE(dev); 98 99 return acpi_has_method(handle, "_RST"); 100 #else 101 return false; 102 #endif 103 } 104 105 static bool vfio_platform_has_reset(struct vfio_platform_device *vdev) 106 { 107 if (VFIO_PLATFORM_IS_ACPI(vdev)) 108 return vfio_platform_acpi_has_reset(vdev); 109 110 return vdev->of_reset ? true : false; 111 } 112 113 static int vfio_platform_get_reset(struct vfio_platform_device *vdev) 114 { 115 if (VFIO_PLATFORM_IS_ACPI(vdev)) 116 return vfio_platform_acpi_has_reset(vdev) ? 0 : -ENOENT; 117 118 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, 119 &vdev->reset_module); 120 if (!vdev->of_reset) { 121 request_module("vfio-reset:%s", vdev->compat); 122 vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, 123 &vdev->reset_module); 124 } 125 126 return vdev->of_reset ? 0 : -ENOENT; 127 } 128 129 static void vfio_platform_put_reset(struct vfio_platform_device *vdev) 130 { 131 if (VFIO_PLATFORM_IS_ACPI(vdev)) 132 return; 133 134 if (vdev->of_reset) 135 module_put(vdev->reset_module); 136 } 137 138 static int vfio_platform_regions_init(struct vfio_platform_device *vdev) 139 { 140 int cnt = 0, i; 141 142 while (vdev->get_resource(vdev, cnt)) 143 cnt++; 144 145 vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region), 146 GFP_KERNEL); 147 if (!vdev->regions) 148 return -ENOMEM; 149 150 for (i = 0; i < cnt; i++) { 151 struct resource *res = 152 vdev->get_resource(vdev, i); 153 154 if (!res) 155 goto err; 156 157 vdev->regions[i].addr = res->start; 158 vdev->regions[i].size = resource_size(res); 159 vdev->regions[i].flags = 0; 160 161 switch (resource_type(res)) { 162 case IORESOURCE_MEM: 163 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO; 164 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; 165 if (!(res->flags & IORESOURCE_READONLY)) 166 vdev->regions[i].flags |= 167 VFIO_REGION_INFO_FLAG_WRITE; 168 169 /* 170 * Only regions addressed with PAGE granularity may be 171 * MMAPed securely. 172 */ 173 if (!(vdev->regions[i].addr & ~PAGE_MASK) && 174 !(vdev->regions[i].size & ~PAGE_MASK)) 175 vdev->regions[i].flags |= 176 VFIO_REGION_INFO_FLAG_MMAP; 177 178 break; 179 case IORESOURCE_IO: 180 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO; 181 break; 182 default: 183 goto err; 184 } 185 } 186 187 vdev->num_regions = cnt; 188 189 return 0; 190 err: 191 kfree(vdev->regions); 192 return -EINVAL; 193 } 194 195 static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev) 196 { 197 int i; 198 199 for (i = 0; i < vdev->num_regions; i++) 200 iounmap(vdev->regions[i].ioaddr); 201 202 vdev->num_regions = 0; 203 kfree(vdev->regions); 204 } 205 206 static int vfio_platform_call_reset(struct vfio_platform_device *vdev, 207 const char **extra_dbg) 208 { 209 if (VFIO_PLATFORM_IS_ACPI(vdev)) { 210 dev_info(vdev->device, "reset\n"); 211 return vfio_platform_acpi_call_reset(vdev, extra_dbg); 212 } else if (vdev->of_reset) { 213 dev_info(vdev->device, "reset\n"); 214 return vdev->of_reset(vdev); 215 } 216 217 dev_warn(vdev->device, "no reset function found!\n"); 218 return -EINVAL; 219 } 220 221 static void vfio_platform_release(struct vfio_device *core_vdev) 222 { 223 struct vfio_platform_device *vdev = 224 container_of(core_vdev, struct vfio_platform_device, vdev); 225 226 mutex_lock(&driver_lock); 227 228 if (!(--vdev->refcnt)) { 229 const char *extra_dbg = NULL; 230 int ret; 231 232 ret = vfio_platform_call_reset(vdev, &extra_dbg); 233 if (ret && vdev->reset_required) { 234 dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n", 235 ret, extra_dbg ? extra_dbg : ""); 236 WARN_ON(1); 237 } 238 pm_runtime_put(vdev->device); 239 vfio_platform_regions_cleanup(vdev); 240 vfio_platform_irq_cleanup(vdev); 241 } 242 243 mutex_unlock(&driver_lock); 244 } 245 246 static int vfio_platform_open(struct vfio_device *core_vdev) 247 { 248 struct vfio_platform_device *vdev = 249 container_of(core_vdev, struct vfio_platform_device, vdev); 250 int ret; 251 252 mutex_lock(&driver_lock); 253 254 if (!vdev->refcnt) { 255 const char *extra_dbg = NULL; 256 257 ret = vfio_platform_regions_init(vdev); 258 if (ret) 259 goto err_reg; 260 261 ret = vfio_platform_irq_init(vdev); 262 if (ret) 263 goto err_irq; 264 265 ret = pm_runtime_get_sync(vdev->device); 266 if (ret < 0) 267 goto err_rst; 268 269 ret = vfio_platform_call_reset(vdev, &extra_dbg); 270 if (ret && vdev->reset_required) { 271 dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n", 272 ret, extra_dbg ? extra_dbg : ""); 273 goto err_rst; 274 } 275 } 276 277 vdev->refcnt++; 278 279 mutex_unlock(&driver_lock); 280 return 0; 281 282 err_rst: 283 pm_runtime_put(vdev->device); 284 vfio_platform_irq_cleanup(vdev); 285 err_irq: 286 vfio_platform_regions_cleanup(vdev); 287 err_reg: 288 mutex_unlock(&driver_lock); 289 return ret; 290 } 291 292 static long vfio_platform_ioctl(struct vfio_device *core_vdev, 293 unsigned int cmd, unsigned long arg) 294 { 295 struct vfio_platform_device *vdev = 296 container_of(core_vdev, struct vfio_platform_device, vdev); 297 298 unsigned long minsz; 299 300 if (cmd == VFIO_DEVICE_GET_INFO) { 301 struct vfio_device_info info; 302 303 minsz = offsetofend(struct vfio_device_info, num_irqs); 304 305 if (copy_from_user(&info, (void __user *)arg, minsz)) 306 return -EFAULT; 307 308 if (info.argsz < minsz) 309 return -EINVAL; 310 311 if (vfio_platform_has_reset(vdev)) 312 vdev->flags |= VFIO_DEVICE_FLAGS_RESET; 313 info.flags = vdev->flags; 314 info.num_regions = vdev->num_regions; 315 info.num_irqs = vdev->num_irqs; 316 317 return copy_to_user((void __user *)arg, &info, minsz) ? 318 -EFAULT : 0; 319 320 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 321 struct vfio_region_info info; 322 323 minsz = offsetofend(struct vfio_region_info, offset); 324 325 if (copy_from_user(&info, (void __user *)arg, minsz)) 326 return -EFAULT; 327 328 if (info.argsz < minsz) 329 return -EINVAL; 330 331 if (info.index >= vdev->num_regions) 332 return -EINVAL; 333 334 /* map offset to the physical address */ 335 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); 336 info.size = vdev->regions[info.index].size; 337 info.flags = vdev->regions[info.index].flags; 338 339 return copy_to_user((void __user *)arg, &info, minsz) ? 340 -EFAULT : 0; 341 342 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 343 struct vfio_irq_info info; 344 345 minsz = offsetofend(struct vfio_irq_info, count); 346 347 if (copy_from_user(&info, (void __user *)arg, minsz)) 348 return -EFAULT; 349 350 if (info.argsz < minsz) 351 return -EINVAL; 352 353 if (info.index >= vdev->num_irqs) 354 return -EINVAL; 355 356 info.flags = vdev->irqs[info.index].flags; 357 info.count = vdev->irqs[info.index].count; 358 359 return copy_to_user((void __user *)arg, &info, minsz) ? 360 -EFAULT : 0; 361 362 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 363 struct vfio_irq_set hdr; 364 u8 *data = NULL; 365 int ret = 0; 366 size_t data_size = 0; 367 368 minsz = offsetofend(struct vfio_irq_set, count); 369 370 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 371 return -EFAULT; 372 373 ret = vfio_set_irqs_validate_and_prepare(&hdr, vdev->num_irqs, 374 vdev->num_irqs, &data_size); 375 if (ret) 376 return ret; 377 378 if (data_size) { 379 data = memdup_user((void __user *)(arg + minsz), 380 data_size); 381 if (IS_ERR(data)) 382 return PTR_ERR(data); 383 } 384 385 mutex_lock(&vdev->igate); 386 387 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 388 hdr.start, hdr.count, data); 389 mutex_unlock(&vdev->igate); 390 kfree(data); 391 392 return ret; 393 394 } else if (cmd == VFIO_DEVICE_RESET) { 395 return vfio_platform_call_reset(vdev, NULL); 396 } 397 398 return -ENOTTY; 399 } 400 401 static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg, 402 char __user *buf, size_t count, 403 loff_t off) 404 { 405 unsigned int done = 0; 406 407 if (!reg->ioaddr) { 408 reg->ioaddr = 409 ioremap(reg->addr, reg->size); 410 411 if (!reg->ioaddr) 412 return -ENOMEM; 413 } 414 415 while (count) { 416 size_t filled; 417 418 if (count >= 4 && !(off % 4)) { 419 u32 val; 420 421 val = ioread32(reg->ioaddr + off); 422 if (copy_to_user(buf, &val, 4)) 423 goto err; 424 425 filled = 4; 426 } else if (count >= 2 && !(off % 2)) { 427 u16 val; 428 429 val = ioread16(reg->ioaddr + off); 430 if (copy_to_user(buf, &val, 2)) 431 goto err; 432 433 filled = 2; 434 } else { 435 u8 val; 436 437 val = ioread8(reg->ioaddr + off); 438 if (copy_to_user(buf, &val, 1)) 439 goto err; 440 441 filled = 1; 442 } 443 444 445 count -= filled; 446 done += filled; 447 off += filled; 448 buf += filled; 449 } 450 451 return done; 452 err: 453 return -EFAULT; 454 } 455 456 static ssize_t vfio_platform_read(struct vfio_device *core_vdev, 457 char __user *buf, size_t count, loff_t *ppos) 458 { 459 struct vfio_platform_device *vdev = 460 container_of(core_vdev, struct vfio_platform_device, vdev); 461 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); 462 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; 463 464 if (index >= vdev->num_regions) 465 return -EINVAL; 466 467 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) 468 return -EINVAL; 469 470 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) 471 return vfio_platform_read_mmio(&vdev->regions[index], 472 buf, count, off); 473 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) 474 return -EINVAL; /* not implemented */ 475 476 return -EINVAL; 477 } 478 479 static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg, 480 const char __user *buf, size_t count, 481 loff_t off) 482 { 483 unsigned int done = 0; 484 485 if (!reg->ioaddr) { 486 reg->ioaddr = 487 ioremap(reg->addr, reg->size); 488 489 if (!reg->ioaddr) 490 return -ENOMEM; 491 } 492 493 while (count) { 494 size_t filled; 495 496 if (count >= 4 && !(off % 4)) { 497 u32 val; 498 499 if (copy_from_user(&val, buf, 4)) 500 goto err; 501 iowrite32(val, reg->ioaddr + off); 502 503 filled = 4; 504 } else if (count >= 2 && !(off % 2)) { 505 u16 val; 506 507 if (copy_from_user(&val, buf, 2)) 508 goto err; 509 iowrite16(val, reg->ioaddr + off); 510 511 filled = 2; 512 } else { 513 u8 val; 514 515 if (copy_from_user(&val, buf, 1)) 516 goto err; 517 iowrite8(val, reg->ioaddr + off); 518 519 filled = 1; 520 } 521 522 count -= filled; 523 done += filled; 524 off += filled; 525 buf += filled; 526 } 527 528 return done; 529 err: 530 return -EFAULT; 531 } 532 533 static ssize_t vfio_platform_write(struct vfio_device *core_vdev, const char __user *buf, 534 size_t count, loff_t *ppos) 535 { 536 struct vfio_platform_device *vdev = 537 container_of(core_vdev, struct vfio_platform_device, vdev); 538 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); 539 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; 540 541 if (index >= vdev->num_regions) 542 return -EINVAL; 543 544 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) 545 return -EINVAL; 546 547 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) 548 return vfio_platform_write_mmio(&vdev->regions[index], 549 buf, count, off); 550 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) 551 return -EINVAL; /* not implemented */ 552 553 return -EINVAL; 554 } 555 556 static int vfio_platform_mmap_mmio(struct vfio_platform_region region, 557 struct vm_area_struct *vma) 558 { 559 u64 req_len, pgoff, req_start; 560 561 req_len = vma->vm_end - vma->vm_start; 562 pgoff = vma->vm_pgoff & 563 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 564 req_start = pgoff << PAGE_SHIFT; 565 566 if (region.size < PAGE_SIZE || req_start + req_len > region.size) 567 return -EINVAL; 568 569 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 570 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; 571 572 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 573 req_len, vma->vm_page_prot); 574 } 575 576 static int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma) 577 { 578 struct vfio_platform_device *vdev = 579 container_of(core_vdev, struct vfio_platform_device, vdev); 580 unsigned int index; 581 582 index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT); 583 584 if (vma->vm_end < vma->vm_start) 585 return -EINVAL; 586 if (!(vma->vm_flags & VM_SHARED)) 587 return -EINVAL; 588 if (index >= vdev->num_regions) 589 return -EINVAL; 590 if (vma->vm_start & ~PAGE_MASK) 591 return -EINVAL; 592 if (vma->vm_end & ~PAGE_MASK) 593 return -EINVAL; 594 595 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) 596 return -EINVAL; 597 598 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) 599 && (vma->vm_flags & VM_READ)) 600 return -EINVAL; 601 602 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) 603 && (vma->vm_flags & VM_WRITE)) 604 return -EINVAL; 605 606 vma->vm_private_data = vdev; 607 608 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) 609 return vfio_platform_mmap_mmio(vdev->regions[index], vma); 610 611 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) 612 return -EINVAL; /* not implemented */ 613 614 return -EINVAL; 615 } 616 617 static const struct vfio_device_ops vfio_platform_ops = { 618 .name = "vfio-platform", 619 .open = vfio_platform_open, 620 .release = vfio_platform_release, 621 .ioctl = vfio_platform_ioctl, 622 .read = vfio_platform_read, 623 .write = vfio_platform_write, 624 .mmap = vfio_platform_mmap, 625 }; 626 627 static int vfio_platform_of_probe(struct vfio_platform_device *vdev, 628 struct device *dev) 629 { 630 int ret; 631 632 ret = device_property_read_string(dev, "compatible", 633 &vdev->compat); 634 if (ret) 635 dev_err(dev, "Cannot retrieve compat for %s\n", vdev->name); 636 637 return ret; 638 } 639 640 /* 641 * There can be two kernel build combinations. One build where 642 * ACPI is not selected in Kconfig and another one with the ACPI Kconfig. 643 * 644 * In the first case, vfio_platform_acpi_probe will return since 645 * acpi_disabled is 1. DT user will not see any kind of messages from 646 * ACPI. 647 * 648 * In the second case, both DT and ACPI is compiled in but the system is 649 * booting with any of these combinations. 650 * 651 * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine 652 * terminates immediately without any messages. 653 * 654 * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are 655 * valid checks. We cannot claim that this system is DT. 656 */ 657 int vfio_platform_probe_common(struct vfio_platform_device *vdev, 658 struct device *dev) 659 { 660 struct iommu_group *group; 661 int ret; 662 663 vfio_init_group_dev(&vdev->vdev, dev, &vfio_platform_ops); 664 665 ret = vfio_platform_acpi_probe(vdev, dev); 666 if (ret) 667 ret = vfio_platform_of_probe(vdev, dev); 668 669 if (ret) 670 return ret; 671 672 vdev->device = dev; 673 674 ret = vfio_platform_get_reset(vdev); 675 if (ret && vdev->reset_required) { 676 dev_err(dev, "No reset function found for device %s\n", 677 vdev->name); 678 return ret; 679 } 680 681 group = vfio_iommu_group_get(dev); 682 if (!group) { 683 dev_err(dev, "No IOMMU group for device %s\n", vdev->name); 684 ret = -EINVAL; 685 goto put_reset; 686 } 687 688 ret = vfio_register_group_dev(&vdev->vdev); 689 if (ret) 690 goto put_iommu; 691 692 mutex_init(&vdev->igate); 693 694 pm_runtime_enable(dev); 695 return 0; 696 697 put_iommu: 698 vfio_iommu_group_put(group, dev); 699 put_reset: 700 vfio_platform_put_reset(vdev); 701 return ret; 702 } 703 EXPORT_SYMBOL_GPL(vfio_platform_probe_common); 704 705 void vfio_platform_remove_common(struct vfio_platform_device *vdev) 706 { 707 vfio_unregister_group_dev(&vdev->vdev); 708 709 pm_runtime_disable(vdev->device); 710 vfio_platform_put_reset(vdev); 711 vfio_iommu_group_put(vdev->vdev.dev->iommu_group, vdev->vdev.dev); 712 } 713 EXPORT_SYMBOL_GPL(vfio_platform_remove_common); 714 715 void __vfio_platform_register_reset(struct vfio_platform_reset_node *node) 716 { 717 mutex_lock(&driver_lock); 718 list_add(&node->link, &reset_list); 719 mutex_unlock(&driver_lock); 720 } 721 EXPORT_SYMBOL_GPL(__vfio_platform_register_reset); 722 723 void vfio_platform_unregister_reset(const char *compat, 724 vfio_platform_reset_fn_t fn) 725 { 726 struct vfio_platform_reset_node *iter, *temp; 727 728 mutex_lock(&driver_lock); 729 list_for_each_entry_safe(iter, temp, &reset_list, link) { 730 if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) { 731 list_del(&iter->link); 732 break; 733 } 734 } 735 736 mutex_unlock(&driver_lock); 737 738 } 739 EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset); 740 741 MODULE_VERSION(DRIVER_VERSION); 742 MODULE_LICENSE("GPL v2"); 743 MODULE_AUTHOR(DRIVER_AUTHOR); 744 MODULE_DESCRIPTION(DRIVER_DESC); 745