1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright 2020 Noralf Trønnes 4 */ 5 6 #include <linux/dma-buf.h> 7 #include <linux/dma-mapping.h> 8 #include <linux/lz4.h> 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/string_helpers.h> 12 #include <linux/usb.h> 13 #include <linux/vmalloc.h> 14 #include <linux/workqueue.h> 15 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_blend.h> 18 #include <drm/drm_damage_helper.h> 19 #include <drm/drm_debugfs.h> 20 #include <drm/drm_drv.h> 21 #include <drm/drm_fb_helper.h> 22 #include <drm/drm_fourcc.h> 23 #include <drm/drm_gem_atomic_helper.h> 24 #include <drm/drm_gem_framebuffer_helper.h> 25 #include <drm/drm_gem_shmem_helper.h> 26 #include <drm/drm_managed.h> 27 #include <drm/drm_print.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_simple_kms_helper.h> 30 #include <drm/gud.h> 31 32 #include "gud_internal.h" 33 34 /* Only used internally */ 35 static const struct drm_format_info gud_drm_format_r1 = { 36 .format = GUD_DRM_FORMAT_R1, 37 .num_planes = 1, 38 .char_per_block = { 1, 0, 0 }, 39 .block_w = { 8, 0, 0 }, 40 .block_h = { 1, 0, 0 }, 41 .hsub = 1, 42 .vsub = 1, 43 }; 44 45 static const struct drm_format_info gud_drm_format_xrgb1111 = { 46 .format = GUD_DRM_FORMAT_XRGB1111, 47 .num_planes = 1, 48 .char_per_block = { 1, 0, 0 }, 49 .block_w = { 2, 0, 0 }, 50 .block_h = { 1, 0, 0 }, 51 .hsub = 1, 52 .vsub = 1, 53 }; 54 55 static int gud_usb_control_msg(struct usb_interface *intf, bool in, 56 u8 request, u16 value, void *buf, size_t len) 57 { 58 u8 requesttype = USB_TYPE_VENDOR | USB_RECIP_INTERFACE; 59 u8 ifnum = intf->cur_altsetting->desc.bInterfaceNumber; 60 struct usb_device *usb = interface_to_usbdev(intf); 61 unsigned int pipe; 62 63 if (len && !buf) 64 return -EINVAL; 65 66 if (in) { 67 pipe = usb_rcvctrlpipe(usb, 0); 68 requesttype |= USB_DIR_IN; 69 } else { 70 pipe = usb_sndctrlpipe(usb, 0); 71 requesttype |= USB_DIR_OUT; 72 } 73 74 return usb_control_msg(usb, pipe, request, requesttype, value, 75 ifnum, buf, len, USB_CTRL_GET_TIMEOUT); 76 } 77 78 static int gud_get_display_descriptor(struct usb_interface *intf, 79 struct gud_display_descriptor_req *desc) 80 { 81 void *buf; 82 int ret; 83 84 buf = kmalloc(sizeof(*desc), GFP_KERNEL); 85 if (!buf) 86 return -ENOMEM; 87 88 ret = gud_usb_control_msg(intf, true, GUD_REQ_GET_DESCRIPTOR, 0, buf, sizeof(*desc)); 89 memcpy(desc, buf, sizeof(*desc)); 90 kfree(buf); 91 if (ret < 0) 92 return ret; 93 if (ret != sizeof(*desc)) 94 return -EIO; 95 96 if (desc->magic != le32_to_cpu(GUD_DISPLAY_MAGIC)) 97 return -ENODATA; 98 99 DRM_DEV_DEBUG_DRIVER(&intf->dev, 100 "version=%u flags=0x%x compression=0x%x max_buffer_size=%u\n", 101 desc->version, le32_to_cpu(desc->flags), desc->compression, 102 le32_to_cpu(desc->max_buffer_size)); 103 104 if (!desc->version || !desc->max_width || !desc->max_height || 105 le32_to_cpu(desc->min_width) > le32_to_cpu(desc->max_width) || 106 le32_to_cpu(desc->min_height) > le32_to_cpu(desc->max_height)) 107 return -EINVAL; 108 109 return 0; 110 } 111 112 static int gud_status_to_errno(u8 status) 113 { 114 switch (status) { 115 case GUD_STATUS_OK: 116 return 0; 117 case GUD_STATUS_BUSY: 118 return -EBUSY; 119 case GUD_STATUS_REQUEST_NOT_SUPPORTED: 120 return -EOPNOTSUPP; 121 case GUD_STATUS_PROTOCOL_ERROR: 122 return -EPROTO; 123 case GUD_STATUS_INVALID_PARAMETER: 124 return -EINVAL; 125 case GUD_STATUS_ERROR: 126 return -EREMOTEIO; 127 default: 128 return -EREMOTEIO; 129 } 130 } 131 132 static int gud_usb_get_status(struct usb_interface *intf) 133 { 134 int ret, status = -EIO; 135 u8 *buf; 136 137 buf = kmalloc(sizeof(*buf), GFP_KERNEL); 138 if (!buf) 139 return -ENOMEM; 140 141 ret = gud_usb_control_msg(intf, true, GUD_REQ_GET_STATUS, 0, buf, sizeof(*buf)); 142 if (ret == sizeof(*buf)) 143 status = gud_status_to_errno(*buf); 144 kfree(buf); 145 146 if (ret < 0) 147 return ret; 148 149 return status; 150 } 151 152 static int gud_usb_transfer(struct gud_device *gdrm, bool in, u8 request, u16 index, 153 void *buf, size_t len) 154 { 155 struct usb_interface *intf = to_usb_interface(gdrm->drm.dev); 156 int idx, ret; 157 158 drm_dbg(&gdrm->drm, "%s: request=0x%x index=%u len=%zu\n", 159 in ? "get" : "set", request, index, len); 160 161 if (!drm_dev_enter(&gdrm->drm, &idx)) 162 return -ENODEV; 163 164 mutex_lock(&gdrm->ctrl_lock); 165 166 ret = gud_usb_control_msg(intf, in, request, index, buf, len); 167 if (ret == -EPIPE || ((gdrm->flags & GUD_DISPLAY_FLAG_STATUS_ON_SET) && !in && ret >= 0)) { 168 int status; 169 170 status = gud_usb_get_status(intf); 171 if (status < 0) { 172 ret = status; 173 } else if (ret < 0) { 174 dev_err_once(gdrm->drm.dev, 175 "Unexpected status OK for failed transfer\n"); 176 ret = -EPIPE; 177 } 178 } 179 180 if (ret < 0) { 181 drm_dbg(&gdrm->drm, "ret=%d\n", ret); 182 gdrm->stats_num_errors++; 183 } 184 185 mutex_unlock(&gdrm->ctrl_lock); 186 drm_dev_exit(idx); 187 188 return ret; 189 } 190 191 /* 192 * @buf cannot be allocated on the stack. 193 * Returns number of bytes received or negative error code on failure. 194 */ 195 int gud_usb_get(struct gud_device *gdrm, u8 request, u16 index, void *buf, size_t max_len) 196 { 197 return gud_usb_transfer(gdrm, true, request, index, buf, max_len); 198 } 199 200 /* 201 * @buf can be allocated on the stack or NULL. 202 * Returns zero on success or negative error code on failure. 203 */ 204 int gud_usb_set(struct gud_device *gdrm, u8 request, u16 index, void *buf, size_t len) 205 { 206 void *trbuf = NULL; 207 int ret; 208 209 if (buf && len) { 210 trbuf = kmemdup(buf, len, GFP_KERNEL); 211 if (!trbuf) 212 return -ENOMEM; 213 } 214 215 ret = gud_usb_transfer(gdrm, false, request, index, trbuf, len); 216 kfree(trbuf); 217 if (ret < 0) 218 return ret; 219 220 return ret != len ? -EIO : 0; 221 } 222 223 /* 224 * @val can be allocated on the stack. 225 * Returns zero on success or negative error code on failure. 226 */ 227 int gud_usb_get_u8(struct gud_device *gdrm, u8 request, u16 index, u8 *val) 228 { 229 u8 *buf; 230 int ret; 231 232 buf = kmalloc(sizeof(*val), GFP_KERNEL); 233 if (!buf) 234 return -ENOMEM; 235 236 ret = gud_usb_get(gdrm, request, index, buf, sizeof(*val)); 237 *val = *buf; 238 kfree(buf); 239 if (ret < 0) 240 return ret; 241 242 return ret != sizeof(*val) ? -EIO : 0; 243 } 244 245 /* Returns zero on success or negative error code on failure. */ 246 int gud_usb_set_u8(struct gud_device *gdrm, u8 request, u8 val) 247 { 248 return gud_usb_set(gdrm, request, 0, &val, sizeof(val)); 249 } 250 251 static int gud_get_properties(struct gud_device *gdrm) 252 { 253 struct gud_property_req *properties; 254 unsigned int i, num_properties; 255 int ret; 256 257 properties = kcalloc(GUD_PROPERTIES_MAX_NUM, sizeof(*properties), GFP_KERNEL); 258 if (!properties) 259 return -ENOMEM; 260 261 ret = gud_usb_get(gdrm, GUD_REQ_GET_PROPERTIES, 0, 262 properties, GUD_PROPERTIES_MAX_NUM * sizeof(*properties)); 263 if (ret <= 0) 264 goto out; 265 if (ret % sizeof(*properties)) { 266 ret = -EIO; 267 goto out; 268 } 269 270 num_properties = ret / sizeof(*properties); 271 ret = 0; 272 273 gdrm->properties = drmm_kcalloc(&gdrm->drm, num_properties, sizeof(*gdrm->properties), 274 GFP_KERNEL); 275 if (!gdrm->properties) { 276 ret = -ENOMEM; 277 goto out; 278 } 279 280 for (i = 0; i < num_properties; i++) { 281 u16 prop = le16_to_cpu(properties[i].prop); 282 u64 val = le64_to_cpu(properties[i].val); 283 284 switch (prop) { 285 case GUD_PROPERTY_ROTATION: 286 /* 287 * DRM UAPI matches the protocol so use the value directly, 288 * but mask out any additions on future devices. 289 */ 290 val &= GUD_ROTATION_MASK; 291 ret = drm_plane_create_rotation_property(&gdrm->pipe.plane, 292 DRM_MODE_ROTATE_0, val); 293 break; 294 default: 295 /* New ones might show up in future devices, skip those we don't know. */ 296 drm_dbg(&gdrm->drm, "Ignoring unknown property: %u\n", prop); 297 continue; 298 } 299 300 if (ret) 301 goto out; 302 303 gdrm->properties[gdrm->num_properties++] = prop; 304 } 305 out: 306 kfree(properties); 307 308 return ret; 309 } 310 311 /* 312 * FIXME: Dma-buf sharing requires DMA support by the importing device. 313 * This function is a workaround to make USB devices work as well. 314 * See todo.rst for how to fix the issue in the dma-buf framework. 315 */ 316 static struct drm_gem_object *gud_gem_prime_import(struct drm_device *drm, struct dma_buf *dma_buf) 317 { 318 struct gud_device *gdrm = to_gud_device(drm); 319 320 if (!gdrm->dmadev) 321 return ERR_PTR(-ENODEV); 322 323 return drm_gem_prime_import_dev(drm, dma_buf, gdrm->dmadev); 324 } 325 326 static int gud_stats_debugfs(struct seq_file *m, void *data) 327 { 328 struct drm_info_node *node = m->private; 329 struct gud_device *gdrm = to_gud_device(node->minor->dev); 330 char buf[10]; 331 332 string_get_size(gdrm->bulk_len, 1, STRING_UNITS_2, buf, sizeof(buf)); 333 seq_printf(m, "Max buffer size: %s\n", buf); 334 seq_printf(m, "Number of errors: %u\n", gdrm->stats_num_errors); 335 336 seq_puts(m, "Compression: "); 337 if (gdrm->compression & GUD_COMPRESSION_LZ4) 338 seq_puts(m, " lz4"); 339 if (!gdrm->compression) 340 seq_puts(m, " none"); 341 seq_puts(m, "\n"); 342 343 if (gdrm->compression) { 344 u64 remainder; 345 u64 ratio = div64_u64_rem(gdrm->stats_length, gdrm->stats_actual_length, 346 &remainder); 347 u64 ratio_frac = div64_u64(remainder * 10, gdrm->stats_actual_length); 348 349 seq_printf(m, "Compression ratio: %llu.%llu\n", ratio, ratio_frac); 350 } 351 352 return 0; 353 } 354 355 static const struct drm_info_list gud_debugfs_list[] = { 356 { "stats", gud_stats_debugfs, 0, NULL }, 357 }; 358 359 static void gud_debugfs_init(struct drm_minor *minor) 360 { 361 drm_debugfs_create_files(gud_debugfs_list, ARRAY_SIZE(gud_debugfs_list), 362 minor->debugfs_root, minor); 363 } 364 365 static const struct drm_simple_display_pipe_funcs gud_pipe_funcs = { 366 .check = gud_pipe_check, 367 .update = gud_pipe_update, 368 }; 369 370 static const struct drm_mode_config_funcs gud_mode_config_funcs = { 371 .fb_create = drm_gem_fb_create_with_dirty, 372 .atomic_check = drm_atomic_helper_check, 373 .atomic_commit = drm_atomic_helper_commit, 374 }; 375 376 static const u64 gud_pipe_modifiers[] = { 377 DRM_FORMAT_MOD_LINEAR, 378 DRM_FORMAT_MOD_INVALID 379 }; 380 381 DEFINE_DRM_GEM_FOPS(gud_fops); 382 383 static const struct drm_driver gud_drm_driver = { 384 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 385 .fops = &gud_fops, 386 DRM_GEM_SHMEM_DRIVER_OPS, 387 .gem_prime_import = gud_gem_prime_import, 388 .debugfs_init = gud_debugfs_init, 389 390 .name = "gud", 391 .desc = "Generic USB Display", 392 .date = "20200422", 393 .major = 1, 394 .minor = 0, 395 }; 396 397 static int gud_alloc_bulk_buffer(struct gud_device *gdrm) 398 { 399 unsigned int i, num_pages; 400 struct page **pages; 401 void *ptr; 402 int ret; 403 404 gdrm->bulk_buf = vmalloc_32(gdrm->bulk_len); 405 if (!gdrm->bulk_buf) 406 return -ENOMEM; 407 408 num_pages = DIV_ROUND_UP(gdrm->bulk_len, PAGE_SIZE); 409 pages = kmalloc_array(num_pages, sizeof(struct page *), GFP_KERNEL); 410 if (!pages) 411 return -ENOMEM; 412 413 for (i = 0, ptr = gdrm->bulk_buf; i < num_pages; i++, ptr += PAGE_SIZE) 414 pages[i] = vmalloc_to_page(ptr); 415 416 ret = sg_alloc_table_from_pages(&gdrm->bulk_sgt, pages, num_pages, 417 0, gdrm->bulk_len, GFP_KERNEL); 418 kfree(pages); 419 420 return ret; 421 } 422 423 static void gud_free_buffers_and_mutex(void *data) 424 { 425 struct gud_device *gdrm = data; 426 427 vfree(gdrm->compress_buf); 428 gdrm->compress_buf = NULL; 429 sg_free_table(&gdrm->bulk_sgt); 430 vfree(gdrm->bulk_buf); 431 gdrm->bulk_buf = NULL; 432 mutex_destroy(&gdrm->ctrl_lock); 433 } 434 435 static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id) 436 { 437 const struct drm_format_info *xrgb8888_emulation_format = NULL; 438 bool rgb565_supported = false, xrgb8888_supported = false; 439 unsigned int num_formats_dev, num_formats = 0; 440 struct usb_endpoint_descriptor *bulk_out; 441 struct gud_display_descriptor_req desc; 442 struct device *dev = &intf->dev; 443 size_t max_buffer_size = 0; 444 struct gud_device *gdrm; 445 struct drm_device *drm; 446 u8 *formats_dev; 447 u32 *formats; 448 int ret, i; 449 450 ret = usb_find_bulk_out_endpoint(intf->cur_altsetting, &bulk_out); 451 if (ret) 452 return ret; 453 454 ret = gud_get_display_descriptor(intf, &desc); 455 if (ret) { 456 DRM_DEV_DEBUG_DRIVER(dev, "Not a display interface: ret=%d\n", ret); 457 return -ENODEV; 458 } 459 460 if (desc.version > 1) { 461 dev_err(dev, "Protocol version %u is not supported\n", desc.version); 462 return -ENODEV; 463 } 464 465 gdrm = devm_drm_dev_alloc(dev, &gud_drm_driver, struct gud_device, drm); 466 if (IS_ERR(gdrm)) 467 return PTR_ERR(gdrm); 468 469 drm = &gdrm->drm; 470 drm->mode_config.funcs = &gud_mode_config_funcs; 471 ret = drmm_mode_config_init(drm); 472 if (ret) 473 return ret; 474 475 gdrm->flags = le32_to_cpu(desc.flags); 476 gdrm->compression = desc.compression & GUD_COMPRESSION_LZ4; 477 478 if (gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE && gdrm->compression) 479 return -EINVAL; 480 481 mutex_init(&gdrm->ctrl_lock); 482 mutex_init(&gdrm->damage_lock); 483 INIT_WORK(&gdrm->work, gud_flush_work); 484 gud_clear_damage(gdrm); 485 486 ret = devm_add_action(dev, gud_free_buffers_and_mutex, gdrm); 487 if (ret) 488 return ret; 489 490 drm->mode_config.min_width = le32_to_cpu(desc.min_width); 491 drm->mode_config.max_width = le32_to_cpu(desc.max_width); 492 drm->mode_config.min_height = le32_to_cpu(desc.min_height); 493 drm->mode_config.max_height = le32_to_cpu(desc.max_height); 494 495 formats_dev = devm_kmalloc(dev, GUD_FORMATS_MAX_NUM, GFP_KERNEL); 496 /* Add room for emulated XRGB8888 */ 497 formats = devm_kmalloc_array(dev, GUD_FORMATS_MAX_NUM + 1, sizeof(*formats), GFP_KERNEL); 498 if (!formats_dev || !formats) 499 return -ENOMEM; 500 501 ret = gud_usb_get(gdrm, GUD_REQ_GET_FORMATS, 0, formats_dev, GUD_FORMATS_MAX_NUM); 502 if (ret < 0) 503 return ret; 504 505 num_formats_dev = ret; 506 for (i = 0; i < num_formats_dev; i++) { 507 const struct drm_format_info *info; 508 size_t fmt_buf_size; 509 u32 format; 510 511 format = gud_to_fourcc(formats_dev[i]); 512 if (!format) { 513 drm_dbg(drm, "Unsupported format: 0x%02x\n", formats_dev[i]); 514 continue; 515 } 516 517 if (format == GUD_DRM_FORMAT_R1) 518 info = &gud_drm_format_r1; 519 else if (format == GUD_DRM_FORMAT_XRGB1111) 520 info = &gud_drm_format_xrgb1111; 521 else 522 info = drm_format_info(format); 523 524 switch (format) { 525 case GUD_DRM_FORMAT_R1: 526 fallthrough; 527 case DRM_FORMAT_R8: 528 fallthrough; 529 case GUD_DRM_FORMAT_XRGB1111: 530 fallthrough; 531 case DRM_FORMAT_RGB332: 532 fallthrough; 533 case DRM_FORMAT_RGB888: 534 if (!xrgb8888_emulation_format) 535 xrgb8888_emulation_format = info; 536 break; 537 case DRM_FORMAT_RGB565: 538 rgb565_supported = true; 539 if (!xrgb8888_emulation_format) 540 xrgb8888_emulation_format = info; 541 break; 542 case DRM_FORMAT_XRGB8888: 543 xrgb8888_supported = true; 544 break; 545 } 546 547 fmt_buf_size = drm_format_info_min_pitch(info, 0, drm->mode_config.max_width) * 548 drm->mode_config.max_height; 549 max_buffer_size = max(max_buffer_size, fmt_buf_size); 550 551 if (format == GUD_DRM_FORMAT_R1 || format == GUD_DRM_FORMAT_XRGB1111) 552 continue; /* Internal not for userspace */ 553 554 formats[num_formats++] = format; 555 } 556 557 if (!num_formats && !xrgb8888_emulation_format) { 558 dev_err(dev, "No supported pixel formats found\n"); 559 return -EINVAL; 560 } 561 562 /* Prefer speed over color depth */ 563 if (rgb565_supported) 564 drm->mode_config.preferred_depth = 16; 565 566 if (!xrgb8888_supported && xrgb8888_emulation_format) { 567 gdrm->xrgb8888_emulation_format = xrgb8888_emulation_format; 568 formats[num_formats++] = DRM_FORMAT_XRGB8888; 569 } 570 571 if (desc.max_buffer_size) 572 max_buffer_size = le32_to_cpu(desc.max_buffer_size); 573 /* Prevent a misbehaving device from allocating loads of RAM. 4096x4096@XRGB8888 = 64 MB */ 574 if (max_buffer_size > SZ_64M) 575 max_buffer_size = SZ_64M; 576 577 gdrm->bulk_pipe = usb_sndbulkpipe(interface_to_usbdev(intf), usb_endpoint_num(bulk_out)); 578 gdrm->bulk_len = max_buffer_size; 579 580 ret = gud_alloc_bulk_buffer(gdrm); 581 if (ret) 582 return ret; 583 584 if (gdrm->compression & GUD_COMPRESSION_LZ4) { 585 gdrm->lz4_comp_mem = devm_kmalloc(dev, LZ4_MEM_COMPRESS, GFP_KERNEL); 586 if (!gdrm->lz4_comp_mem) 587 return -ENOMEM; 588 589 gdrm->compress_buf = vmalloc(gdrm->bulk_len); 590 if (!gdrm->compress_buf) 591 return -ENOMEM; 592 } 593 594 ret = drm_simple_display_pipe_init(drm, &gdrm->pipe, &gud_pipe_funcs, 595 formats, num_formats, 596 gud_pipe_modifiers, NULL); 597 if (ret) 598 return ret; 599 600 devm_kfree(dev, formats); 601 devm_kfree(dev, formats_dev); 602 603 ret = gud_get_properties(gdrm); 604 if (ret) { 605 dev_err(dev, "Failed to get properties (error=%d)\n", ret); 606 return ret; 607 } 608 609 drm_plane_enable_fb_damage_clips(&gdrm->pipe.plane); 610 611 ret = gud_get_connectors(gdrm); 612 if (ret) { 613 dev_err(dev, "Failed to get connectors (error=%d)\n", ret); 614 return ret; 615 } 616 617 drm_mode_config_reset(drm); 618 619 usb_set_intfdata(intf, gdrm); 620 621 gdrm->dmadev = usb_intf_get_dma_device(intf); 622 if (!gdrm->dmadev) 623 dev_warn(dev, "buffer sharing not supported"); 624 625 ret = drm_dev_register(drm, 0); 626 if (ret) { 627 put_device(gdrm->dmadev); 628 return ret; 629 } 630 631 drm_kms_helper_poll_init(drm); 632 633 drm_fbdev_generic_setup(drm, 0); 634 635 return 0; 636 } 637 638 static void gud_disconnect(struct usb_interface *interface) 639 { 640 struct gud_device *gdrm = usb_get_intfdata(interface); 641 struct drm_device *drm = &gdrm->drm; 642 643 drm_dbg(drm, "%s:\n", __func__); 644 645 drm_kms_helper_poll_fini(drm); 646 drm_dev_unplug(drm); 647 drm_atomic_helper_shutdown(drm); 648 put_device(gdrm->dmadev); 649 gdrm->dmadev = NULL; 650 } 651 652 static int gud_suspend(struct usb_interface *intf, pm_message_t message) 653 { 654 struct gud_device *gdrm = usb_get_intfdata(intf); 655 656 return drm_mode_config_helper_suspend(&gdrm->drm); 657 } 658 659 static int gud_resume(struct usb_interface *intf) 660 { 661 struct gud_device *gdrm = usb_get_intfdata(intf); 662 663 drm_mode_config_helper_resume(&gdrm->drm); 664 665 return 0; 666 } 667 668 static const struct usb_device_id gud_id_table[] = { 669 { USB_DEVICE_INTERFACE_CLASS(0x1d50, 0x614d, USB_CLASS_VENDOR_SPEC) }, 670 { USB_DEVICE_INTERFACE_CLASS(0x16d0, 0x10a9, USB_CLASS_VENDOR_SPEC) }, 671 { } 672 }; 673 674 MODULE_DEVICE_TABLE(usb, gud_id_table); 675 676 static struct usb_driver gud_usb_driver = { 677 .name = "gud", 678 .probe = gud_probe, 679 .disconnect = gud_disconnect, 680 .id_table = gud_id_table, 681 .suspend = gud_suspend, 682 .resume = gud_resume, 683 .reset_resume = gud_resume, 684 }; 685 686 module_usb_driver(gud_usb_driver); 687 688 MODULE_AUTHOR("Noralf Trønnes"); 689 MODULE_LICENSE("Dual MIT/GPL"); 690