drivers/gpu/drm/gud/gud_drv.c

   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_fbdev_generic.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_debugfs_entry *entry = m->private;
 329         struct gud_device *gdrm = to_gud_device(entry->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_simple_display_pipe_funcs gud_pipe_funcs = {
 356         .check      = gud_pipe_check,
 357         .update     = gud_pipe_update,
 358         DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS
 359 };
 360
 361 static const struct drm_mode_config_funcs gud_mode_config_funcs = {
 362         .fb_create = drm_gem_fb_create_with_dirty,
 363         .atomic_check = drm_atomic_helper_check,
 364         .atomic_commit = drm_atomic_helper_commit,
 365 };
 366
 367 static const u64 gud_pipe_modifiers[] = {
 368         DRM_FORMAT_MOD_LINEAR,
 369         DRM_FORMAT_MOD_INVALID
 370 };
 371
 372 DEFINE_DRM_GEM_FOPS(gud_fops);
 373
 374 static const struct drm_driver gud_drm_driver = {
 375         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 376         .fops                   = &gud_fops,
 377         DRM_GEM_SHMEM_DRIVER_OPS,
 378         .gem_prime_import       = gud_gem_prime_import,
 379
 380         .name                   = "gud",
 381         .desc                   = "Generic USB Display",
 382         .date                   = "20200422",
 383         .major                  = 1,
 384         .minor                  = 0,
 385 };
 386
 387 static int gud_alloc_bulk_buffer(struct gud_device *gdrm)
 388 {
 389         unsigned int i, num_pages;
 390         struct page **pages;
 391         void *ptr;
 392         int ret;
 393
 394         gdrm->bulk_buf = vmalloc_32(gdrm->bulk_len);
 395         if (!gdrm->bulk_buf)
 396                 return -ENOMEM;
 397
 398         num_pages = DIV_ROUND_UP(gdrm->bulk_len, PAGE_SIZE);
 399         pages = kmalloc_array(num_pages, sizeof(struct page *), GFP_KERNEL);
 400         if (!pages)
 401                 return -ENOMEM;
 402
 403         for (i = 0, ptr = gdrm->bulk_buf; i < num_pages; i++, ptr += PAGE_SIZE)
 404                 pages[i] = vmalloc_to_page(ptr);
 405
 406         ret = sg_alloc_table_from_pages(&gdrm->bulk_sgt, pages, num_pages,
 407                                         0, gdrm->bulk_len, GFP_KERNEL);
 408         kfree(pages);
 409
 410         return ret;
 411 }
 412
 413 static void gud_free_buffers_and_mutex(void *data)
 414 {
 415         struct gud_device *gdrm = data;
 416
 417         vfree(gdrm->compress_buf);
 418         gdrm->compress_buf = NULL;
 419         sg_free_table(&gdrm->bulk_sgt);
 420         vfree(gdrm->bulk_buf);
 421         gdrm->bulk_buf = NULL;
 422         mutex_destroy(&gdrm->ctrl_lock);
 423 }
 424
 425 static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 426 {
 427         const struct drm_format_info *xrgb8888_emulation_format = NULL;
 428         bool rgb565_supported = false, xrgb8888_supported = false;
 429         unsigned int num_formats_dev, num_formats = 0;
 430         struct usb_endpoint_descriptor *bulk_out;
 431         struct gud_display_descriptor_req desc;
 432         struct device *dev = &intf->dev;
 433         size_t max_buffer_size = 0;
 434         struct gud_device *gdrm;
 435         struct drm_device *drm;
 436         u8 *formats_dev;
 437         u32 *formats;
 438         int ret, i;
 439
 440         ret = usb_find_bulk_out_endpoint(intf->cur_altsetting, &bulk_out);
 441         if (ret)
 442                 return ret;
 443
 444         ret = gud_get_display_descriptor(intf, &desc);
 445         if (ret) {
 446                 DRM_DEV_DEBUG_DRIVER(dev, "Not a display interface: ret=%d\n", ret);
 447                 return -ENODEV;
 448         }
 449
 450         if (desc.version > 1) {
 451                 dev_err(dev, "Protocol version %u is not supported\n", desc.version);
 452                 return -ENODEV;
 453         }
 454
 455         gdrm = devm_drm_dev_alloc(dev, &gud_drm_driver, struct gud_device, drm);
 456         if (IS_ERR(gdrm))
 457                 return PTR_ERR(gdrm);
 458
 459         drm = &gdrm->drm;
 460         drm->mode_config.funcs = &gud_mode_config_funcs;
 461         ret = drmm_mode_config_init(drm);
 462         if (ret)
 463                 return ret;
 464
 465         gdrm->flags = le32_to_cpu(desc.flags);
 466         gdrm->compression = desc.compression & GUD_COMPRESSION_LZ4;
 467
 468         if (gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE && gdrm->compression)
 469                 return -EINVAL;
 470
 471         mutex_init(&gdrm->ctrl_lock);
 472         mutex_init(&gdrm->damage_lock);
 473         INIT_WORK(&gdrm->work, gud_flush_work);
 474         gud_clear_damage(gdrm);
 475
 476         ret = devm_add_action(dev, gud_free_buffers_and_mutex, gdrm);
 477         if (ret)
 478                 return ret;
 479
 480         drm->mode_config.min_width = le32_to_cpu(desc.min_width);
 481         drm->mode_config.max_width = le32_to_cpu(desc.max_width);
 482         drm->mode_config.min_height = le32_to_cpu(desc.min_height);
 483         drm->mode_config.max_height = le32_to_cpu(desc.max_height);
 484
 485         formats_dev = devm_kmalloc(dev, GUD_FORMATS_MAX_NUM, GFP_KERNEL);
 486         /* Add room for emulated XRGB8888 */
 487         formats = devm_kmalloc_array(dev, GUD_FORMATS_MAX_NUM + 1, sizeof(*formats), GFP_KERNEL);
 488         if (!formats_dev || !formats)
 489                 return -ENOMEM;
 490
 491         ret = gud_usb_get(gdrm, GUD_REQ_GET_FORMATS, 0, formats_dev, GUD_FORMATS_MAX_NUM);
 492         if (ret < 0)
 493                 return ret;
 494
 495         num_formats_dev = ret;
 496         for (i = 0; i < num_formats_dev; i++) {
 497                 const struct drm_format_info *info;
 498                 size_t fmt_buf_size;
 499                 u32 format;
 500
 501                 format = gud_to_fourcc(formats_dev[i]);
 502                 if (!format) {
 503                         drm_dbg(drm, "Unsupported format: 0x%02x\n", formats_dev[i]);
 504                         continue;
 505                 }
 506
 507                 if (format == GUD_DRM_FORMAT_R1)
 508                         info = &gud_drm_format_r1;
 509                 else if (format == GUD_DRM_FORMAT_XRGB1111)
 510                         info = &gud_drm_format_xrgb1111;
 511                 else
 512                         info = drm_format_info(format);
 513
 514                 switch (format) {
 515                 case GUD_DRM_FORMAT_R1:
 516                         fallthrough;
 517                 case DRM_FORMAT_R8:
 518                         fallthrough;
 519                 case GUD_DRM_FORMAT_XRGB1111:
 520                         fallthrough;
 521                 case DRM_FORMAT_RGB332:
 522                         fallthrough;
 523                 case DRM_FORMAT_RGB888:
 524                         if (!xrgb8888_emulation_format)
 525                                 xrgb8888_emulation_format = info;
 526                         break;
 527                 case DRM_FORMAT_RGB565:
 528                         rgb565_supported = true;
 529                         if (!xrgb8888_emulation_format)
 530                                 xrgb8888_emulation_format = info;
 531                         break;
 532                 case DRM_FORMAT_XRGB8888:
 533                         xrgb8888_supported = true;
 534                         break;
 535                 }
 536
 537                 fmt_buf_size = drm_format_info_min_pitch(info, 0, drm->mode_config.max_width) *
 538                                drm->mode_config.max_height;
 539                 max_buffer_size = max(max_buffer_size, fmt_buf_size);
 540
 541                 if (format == GUD_DRM_FORMAT_R1 || format == GUD_DRM_FORMAT_XRGB1111)
 542                         continue; /* Internal not for userspace */
 543
 544                 formats[num_formats++] = format;
 545         }
 546
 547         if (!num_formats && !xrgb8888_emulation_format) {
 548                 dev_err(dev, "No supported pixel formats found\n");
 549                 return -EINVAL;
 550         }
 551
 552         /* Prefer speed over color depth */
 553         if (rgb565_supported)
 554                 drm->mode_config.preferred_depth = 16;
 555
 556         if (!xrgb8888_supported && xrgb8888_emulation_format) {
 557                 gdrm->xrgb8888_emulation_format = xrgb8888_emulation_format;
 558                 formats[num_formats++] = DRM_FORMAT_XRGB8888;
 559         }
 560
 561         if (desc.max_buffer_size)
 562                 max_buffer_size = le32_to_cpu(desc.max_buffer_size);
 563         /* Prevent a misbehaving device from allocating loads of RAM. 4096x4096@XRGB8888 = 64 MB */
 564         if (max_buffer_size > SZ_64M)
 565                 max_buffer_size = SZ_64M;
 566
 567         gdrm->bulk_pipe = usb_sndbulkpipe(interface_to_usbdev(intf), usb_endpoint_num(bulk_out));
 568         gdrm->bulk_len = max_buffer_size;
 569
 570         ret = gud_alloc_bulk_buffer(gdrm);
 571         if (ret)
 572                 return ret;
 573
 574         if (gdrm->compression & GUD_COMPRESSION_LZ4) {
 575                 gdrm->lz4_comp_mem = devm_kmalloc(dev, LZ4_MEM_COMPRESS, GFP_KERNEL);
 576                 if (!gdrm->lz4_comp_mem)
 577                         return -ENOMEM;
 578
 579                 gdrm->compress_buf = vmalloc(gdrm->bulk_len);
 580                 if (!gdrm->compress_buf)
 581                         return -ENOMEM;
 582         }
 583
 584         ret = drm_simple_display_pipe_init(drm, &gdrm->pipe, &gud_pipe_funcs,
 585                                            formats, num_formats,
 586                                            gud_pipe_modifiers, NULL);
 587         if (ret)
 588                 return ret;
 589
 590         devm_kfree(dev, formats);
 591         devm_kfree(dev, formats_dev);
 592
 593         ret = gud_get_properties(gdrm);
 594         if (ret) {
 595                 dev_err(dev, "Failed to get properties (error=%d)\n", ret);
 596                 return ret;
 597         }
 598
 599         drm_plane_enable_fb_damage_clips(&gdrm->pipe.plane);
 600
 601         ret = gud_get_connectors(gdrm);
 602         if (ret) {
 603                 dev_err(dev, "Failed to get connectors (error=%d)\n", ret);
 604                 return ret;
 605         }
 606
 607         drm_mode_config_reset(drm);
 608
 609         usb_set_intfdata(intf, gdrm);
 610
 611         gdrm->dmadev = usb_intf_get_dma_device(intf);
 612         if (!gdrm->dmadev)
 613                 dev_warn(dev, "buffer sharing not supported");
 614
 615         drm_debugfs_add_file(drm, "stats", gud_stats_debugfs, NULL);
 616
 617         ret = drm_dev_register(drm, 0);
 618         if (ret) {
 619                 put_device(gdrm->dmadev);
 620                 return ret;
 621         }
 622
 623         drm_kms_helper_poll_init(drm);
 624
 625         drm_fbdev_generic_setup(drm, 0);
 626
 627         return 0;
 628 }
 629
 630 static void gud_disconnect(struct usb_interface *interface)
 631 {
 632         struct gud_device *gdrm = usb_get_intfdata(interface);
 633         struct drm_device *drm = &gdrm->drm;
 634
 635         drm_dbg(drm, "%s:\n", __func__);
 636
 637         drm_kms_helper_poll_fini(drm);
 638         drm_dev_unplug(drm);
 639         drm_atomic_helper_shutdown(drm);
 640         put_device(gdrm->dmadev);
 641         gdrm->dmadev = NULL;
 642 }
 643
 644 static int gud_suspend(struct usb_interface *intf, pm_message_t message)
 645 {
 646         struct gud_device *gdrm = usb_get_intfdata(intf);
 647
 648         return drm_mode_config_helper_suspend(&gdrm->drm);
 649 }
 650
 651 static int gud_resume(struct usb_interface *intf)
 652 {
 653         struct gud_device *gdrm = usb_get_intfdata(intf);
 654
 655         drm_mode_config_helper_resume(&gdrm->drm);
 656
 657         return 0;
 658 }
 659
 660 static const struct usb_device_id gud_id_table[] = {
 661         { USB_DEVICE_INTERFACE_CLASS(0x1d50, 0x614d, USB_CLASS_VENDOR_SPEC) },
 662         { USB_DEVICE_INTERFACE_CLASS(0x16d0, 0x10a9, USB_CLASS_VENDOR_SPEC) },
 663         { }
 664 };
 665
 666 MODULE_DEVICE_TABLE(usb, gud_id_table);
 667
 668 static struct usb_driver gud_usb_driver = {
 669         .name           = "gud",
 670         .probe          = gud_probe,
 671         .disconnect     = gud_disconnect,
 672         .id_table       = gud_id_table,
 673         .suspend        = gud_suspend,
 674         .resume         = gud_resume,
 675         .reset_resume   = gud_resume,
 676 };
 677
 678 module_usb_driver(gud_usb_driver);
 679
 680 MODULE_AUTHOR("Noralf Trønnes");
 681 MODULE_LICENSE("Dual MIT/GPL");