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
gud_usb_control_msg(struct usb_interface * intf,bool in,u8 request,u16 value,void * buf,size_t len)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
gud_get_display_descriptor(struct usb_interface * intf,struct gud_display_descriptor_req * desc)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
gud_status_to_errno(u8 status)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
gud_usb_get_status(struct usb_interface * intf)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
gud_usb_transfer(struct gud_device * gdrm,bool in,u8 request,u16 index,void * buf,size_t len)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 */
gud_usb_get(struct gud_device * gdrm,u8 request,u16 index,void * buf,size_t max_len)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 */
gud_usb_set(struct gud_device * gdrm,u8 request,u16 index,void * buf,size_t len)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 */
gud_usb_get_u8(struct gud_device * gdrm,u8 request,u16 index,u8 * val)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. */
gud_usb_set_u8(struct gud_device * gdrm,u8 request,u8 val)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
gud_get_properties(struct gud_device * gdrm)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 */
gud_gem_prime_import(struct drm_device * drm,struct dma_buf * dma_buf)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
gud_stats_debugfs(struct seq_file * m,void * data)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
gud_alloc_bulk_buffer(struct gud_device * gdrm)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
gud_free_buffers_and_mutex(void * data)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
gud_probe(struct usb_interface * intf,const struct usb_device_id * id)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
gud_disconnect(struct usb_interface * interface)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
gud_suspend(struct usb_interface * intf,pm_message_t message)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
gud_resume(struct usb_interface * intf)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");
682