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/clients/drm_client_setup.h>
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_blend.h>
19 #include <drm/drm_crtc_helper.h>
20 #include <drm/drm_damage_helper.h>
21 #include <drm/drm_debugfs.h>
22 #include <drm/drm_drv.h>
23 #include <drm/drm_fbdev_shmem.h>
24 #include <drm/drm_fourcc.h>
25 #include <drm/drm_gem_atomic_helper.h>
26 #include <drm/drm_gem_framebuffer_helper.h>
27 #include <drm/drm_gem_shmem_helper.h>
28 #include <drm/drm_managed.h>
29 #include <drm/drm_print.h>
30 #include <drm/drm_probe_helper.h>
31 #include <drm/gud.h>
32
33 #include "gud_internal.h"
34
35 /* Only used internally */
36 static const struct drm_format_info gud_drm_format_r1 = {
37 .format = GUD_DRM_FORMAT_R1,
38 .num_planes = 1,
39 .char_per_block = { 1, 0, 0 },
40 .block_w = { 8, 0, 0 },
41 .block_h = { 1, 0, 0 },
42 .hsub = 1,
43 .vsub = 1,
44 };
45
46 static const struct drm_format_info gud_drm_format_xrgb1111 = {
47 .format = GUD_DRM_FORMAT_XRGB1111,
48 .num_planes = 1,
49 .char_per_block = { 1, 0, 0 },
50 .block_w = { 2, 0, 0 },
51 .block_h = { 1, 0, 0 },
52 .hsub = 1,
53 .vsub = 1,
54 };
55
gud_usb_control_msg(struct usb_interface * intf,bool in,u8 request,u16 value,void * buf,size_t len)56 static int gud_usb_control_msg(struct usb_interface *intf, bool in,
57 u8 request, u16 value, void *buf, size_t len)
58 {
59 u8 requesttype = USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
60 u8 ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
61 struct usb_device *usb = interface_to_usbdev(intf);
62 unsigned int pipe;
63
64 if (len && !buf)
65 return -EINVAL;
66
67 if (in) {
68 pipe = usb_rcvctrlpipe(usb, 0);
69 requesttype |= USB_DIR_IN;
70 } else {
71 pipe = usb_sndctrlpipe(usb, 0);
72 requesttype |= USB_DIR_OUT;
73 }
74
75 return usb_control_msg(usb, pipe, request, requesttype, value,
76 ifnum, buf, len, USB_CTRL_GET_TIMEOUT);
77 }
78
gud_get_display_descriptor(struct usb_interface * intf,struct gud_display_descriptor_req * desc)79 static int gud_get_display_descriptor(struct usb_interface *intf,
80 struct gud_display_descriptor_req *desc)
81 {
82 void *buf;
83 int ret;
84
85 buf = kmalloc_obj(*desc);
86 if (!buf)
87 return -ENOMEM;
88
89 ret = gud_usb_control_msg(intf, true, GUD_REQ_GET_DESCRIPTOR, 0, buf, sizeof(*desc));
90 memcpy(desc, buf, sizeof(*desc));
91 kfree(buf);
92 if (ret < 0)
93 return ret;
94 if (ret != sizeof(*desc))
95 return -EIO;
96
97 if (desc->magic != le32_to_cpu(GUD_DISPLAY_MAGIC))
98 return -ENODATA;
99
100 DRM_DEV_DEBUG_DRIVER(&intf->dev,
101 "version=%u flags=0x%x compression=0x%x max_buffer_size=%u\n",
102 desc->version, le32_to_cpu(desc->flags), desc->compression,
103 le32_to_cpu(desc->max_buffer_size));
104
105 if (!desc->version || !desc->max_width || !desc->max_height ||
106 le32_to_cpu(desc->min_width) > le32_to_cpu(desc->max_width) ||
107 le32_to_cpu(desc->min_height) > le32_to_cpu(desc->max_height))
108 return -EINVAL;
109
110 return 0;
111 }
112
gud_status_to_errno(u8 status)113 static int gud_status_to_errno(u8 status)
114 {
115 switch (status) {
116 case GUD_STATUS_OK:
117 return 0;
118 case GUD_STATUS_BUSY:
119 return -EBUSY;
120 case GUD_STATUS_REQUEST_NOT_SUPPORTED:
121 return -EOPNOTSUPP;
122 case GUD_STATUS_PROTOCOL_ERROR:
123 return -EPROTO;
124 case GUD_STATUS_INVALID_PARAMETER:
125 return -EINVAL;
126 case GUD_STATUS_ERROR:
127 return -EREMOTEIO;
128 default:
129 return -EREMOTEIO;
130 }
131 }
132
gud_usb_get_status(struct usb_interface * intf)133 static int gud_usb_get_status(struct usb_interface *intf)
134 {
135 int ret, status = -EIO;
136 u8 *buf;
137
138 buf = kmalloc_obj(*buf);
139 if (!buf)
140 return -ENOMEM;
141
142 ret = gud_usb_control_msg(intf, true, GUD_REQ_GET_STATUS, 0, buf, sizeof(*buf));
143 if (ret == sizeof(*buf))
144 status = gud_status_to_errno(*buf);
145 kfree(buf);
146
147 if (ret < 0)
148 return ret;
149
150 return status;
151 }
152
gud_usb_transfer(struct gud_device * gdrm,bool in,u8 request,u16 index,void * buf,size_t len)153 static int gud_usb_transfer(struct gud_device *gdrm, bool in, u8 request, u16 index,
154 void *buf, size_t len)
155 {
156 struct usb_interface *intf = to_usb_interface(gdrm->drm.dev);
157 int idx, ret;
158
159 drm_dbg(&gdrm->drm, "%s: request=0x%x index=%u len=%zu\n",
160 in ? "get" : "set", request, index, len);
161
162 if (!drm_dev_enter(&gdrm->drm, &idx))
163 return -ENODEV;
164
165 mutex_lock(&gdrm->ctrl_lock);
166
167 ret = gud_usb_control_msg(intf, in, request, index, buf, len);
168 if (ret == -EPIPE || ((gdrm->flags & GUD_DISPLAY_FLAG_STATUS_ON_SET) && !in && ret >= 0)) {
169 int status;
170
171 status = gud_usb_get_status(intf);
172 if (status < 0) {
173 ret = status;
174 } else if (ret < 0) {
175 dev_err_once(gdrm->drm.dev,
176 "Unexpected status OK for failed transfer\n");
177 ret = -EPIPE;
178 }
179 }
180
181 if (ret < 0) {
182 drm_dbg(&gdrm->drm, "ret=%d\n", ret);
183 gdrm->stats_num_errors++;
184 }
185
186 mutex_unlock(&gdrm->ctrl_lock);
187 drm_dev_exit(idx);
188
189 return ret;
190 }
191
192 /*
193 * @buf cannot be allocated on the stack.
194 * Returns number of bytes received or negative error code on failure.
195 */
gud_usb_get(struct gud_device * gdrm,u8 request,u16 index,void * buf,size_t max_len)196 int gud_usb_get(struct gud_device *gdrm, u8 request, u16 index, void *buf, size_t max_len)
197 {
198 return gud_usb_transfer(gdrm, true, request, index, buf, max_len);
199 }
200
201 /*
202 * @buf can be allocated on the stack or NULL.
203 * Returns zero on success or negative error code on failure.
204 */
gud_usb_set(struct gud_device * gdrm,u8 request,u16 index,void * buf,size_t len)205 int gud_usb_set(struct gud_device *gdrm, u8 request, u16 index, void *buf, size_t len)
206 {
207 void *trbuf = NULL;
208 int ret;
209
210 if (buf && len) {
211 trbuf = kmemdup(buf, len, GFP_KERNEL);
212 if (!trbuf)
213 return -ENOMEM;
214 }
215
216 ret = gud_usb_transfer(gdrm, false, request, index, trbuf, len);
217 kfree(trbuf);
218 if (ret < 0)
219 return ret;
220
221 return ret != len ? -EIO : 0;
222 }
223
224 /*
225 * @val can be allocated on the stack.
226 * Returns zero on success or negative error code on failure.
227 */
gud_usb_get_u8(struct gud_device * gdrm,u8 request,u16 index,u8 * val)228 int gud_usb_get_u8(struct gud_device *gdrm, u8 request, u16 index, u8 *val)
229 {
230 u8 *buf;
231 int ret;
232
233 buf = kmalloc(sizeof(*val), GFP_KERNEL);
234 if (!buf)
235 return -ENOMEM;
236
237 ret = gud_usb_get(gdrm, request, index, buf, sizeof(*val));
238 *val = *buf;
239 kfree(buf);
240 if (ret < 0)
241 return ret;
242
243 return ret != sizeof(*val) ? -EIO : 0;
244 }
245
246 /* Returns zero on success or negative error code on failure. */
gud_usb_set_u8(struct gud_device * gdrm,u8 request,u8 val)247 int gud_usb_set_u8(struct gud_device *gdrm, u8 request, u8 val)
248 {
249 return gud_usb_set(gdrm, request, 0, &val, sizeof(val));
250 }
251
gud_plane_add_properties(struct gud_device * gdrm)252 static int gud_plane_add_properties(struct gud_device *gdrm)
253 {
254 struct gud_property_req *properties;
255 unsigned int i, num_properties;
256 int ret;
257
258 properties = kzalloc_objs(*properties, GUD_PROPERTIES_MAX_NUM);
259 if (!properties)
260 return -ENOMEM;
261
262 ret = gud_usb_get(gdrm, GUD_REQ_GET_PROPERTIES, 0,
263 properties, GUD_PROPERTIES_MAX_NUM * sizeof(*properties));
264 if (ret <= 0)
265 goto out;
266 if (ret % sizeof(*properties)) {
267 ret = -EIO;
268 goto out;
269 }
270
271 num_properties = ret / sizeof(*properties);
272 ret = 0;
273
274 gdrm->properties = drmm_kcalloc(&gdrm->drm, num_properties, sizeof(*gdrm->properties),
275 GFP_KERNEL);
276 if (!gdrm->properties) {
277 ret = -ENOMEM;
278 goto out;
279 }
280
281 for (i = 0; i < num_properties; i++) {
282 u16 prop = le16_to_cpu(properties[i].prop);
283 u64 val = le64_to_cpu(properties[i].val);
284
285 switch (prop) {
286 case GUD_PROPERTY_ROTATION:
287 /*
288 * DRM UAPI matches the protocol so use the value directly,
289 * but mask out any additions on future devices.
290 */
291 val &= GUD_ROTATION_MASK;
292 ret = drm_plane_create_rotation_property(&gdrm->plane,
293 DRM_MODE_ROTATE_0, val);
294 break;
295 default:
296 /* New ones might show up in future devices, skip those we don't know. */
297 drm_dbg(&gdrm->drm, "Ignoring unknown property: %u\n", prop);
298 continue;
299 }
300
301 if (ret)
302 goto out;
303
304 gdrm->properties[gdrm->num_properties++] = prop;
305 }
306 out:
307 kfree(properties);
308
309 return ret;
310 }
311
gud_stats_debugfs(struct seq_file * m,void * data)312 static int gud_stats_debugfs(struct seq_file *m, void *data)
313 {
314 struct drm_debugfs_entry *entry = m->private;
315 struct gud_device *gdrm = to_gud_device(entry->dev);
316 char buf[10];
317
318 string_get_size(gdrm->bulk_len, 1, STRING_UNITS_2, buf, sizeof(buf));
319 seq_printf(m, "Max buffer size: %s\n", buf);
320 seq_printf(m, "Number of errors: %u\n", gdrm->stats_num_errors);
321
322 seq_puts(m, "Compression: ");
323 if (gdrm->compression & GUD_COMPRESSION_LZ4)
324 seq_puts(m, " lz4");
325 if (!gdrm->compression)
326 seq_puts(m, " none");
327 seq_puts(m, "\n");
328
329 if (gdrm->compression) {
330 u64 remainder;
331 u64 ratio = div64_u64_rem(gdrm->stats_length, gdrm->stats_actual_length,
332 &remainder);
333 u64 ratio_frac = div64_u64(remainder * 10, gdrm->stats_actual_length);
334
335 seq_printf(m, "Compression ratio: %llu.%llu\n", ratio, ratio_frac);
336 }
337
338 return 0;
339 }
340
341 static const struct drm_crtc_helper_funcs gud_crtc_helper_funcs = {
342 .atomic_check = drm_crtc_helper_atomic_check,
343 .atomic_enable = gud_crtc_atomic_enable,
344 .atomic_disable = gud_crtc_atomic_disable,
345 };
346
347 static const struct drm_crtc_funcs gud_crtc_funcs = {
348 .reset = drm_atomic_helper_crtc_reset,
349 .destroy = drm_crtc_cleanup,
350 .set_config = drm_atomic_helper_set_config,
351 .page_flip = drm_atomic_helper_page_flip,
352 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
353 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
354 };
355
356 static const struct drm_plane_helper_funcs gud_plane_helper_funcs = {
357 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
358 .atomic_check = gud_plane_atomic_check,
359 .atomic_update = gud_plane_atomic_update,
360 };
361
362 static const struct drm_plane_funcs gud_plane_funcs = {
363 .update_plane = drm_atomic_helper_update_plane,
364 .disable_plane = drm_atomic_helper_disable_plane,
365 .destroy = drm_plane_cleanup,
366 DRM_GEM_SHADOW_PLANE_FUNCS,
367 };
368
369 static const struct drm_mode_config_helper_funcs gud_mode_config_helpers = {
370 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
371 };
372
373 static const struct drm_mode_config_funcs gud_mode_config_funcs = {
374 .fb_create = drm_gem_fb_create_with_dirty,
375 .atomic_check = drm_atomic_helper_check,
376 .atomic_commit = drm_atomic_helper_commit,
377 };
378
379 static const u64 gud_plane_modifiers[] = {
380 DRM_FORMAT_MOD_LINEAR,
381 DRM_FORMAT_MOD_INVALID
382 };
383
384 DEFINE_DRM_GEM_FOPS(gud_fops);
385
386 static const struct drm_driver gud_drm_driver = {
387 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
388 .fops = &gud_fops,
389 DRM_GEM_SHMEM_DRIVER_OPS,
390 DRM_FBDEV_SHMEM_DRIVER_OPS,
391
392 .name = "gud",
393 .desc = "Generic USB Display",
394 .major = 1,
395 .minor = 0,
396 };
397
gud_alloc_bulk_buffer(struct gud_device * gdrm)398 static int gud_alloc_bulk_buffer(struct gud_device *gdrm)
399 {
400 unsigned int i, num_pages;
401 struct page **pages;
402 void *ptr;
403 int ret;
404
405 gdrm->bulk_buf = vmalloc_32(gdrm->bulk_len);
406 if (!gdrm->bulk_buf)
407 return -ENOMEM;
408
409 num_pages = DIV_ROUND_UP(gdrm->bulk_len, PAGE_SIZE);
410 pages = kmalloc_objs(struct page *, num_pages);
411 if (!pages)
412 return -ENOMEM;
413
414 for (i = 0, ptr = gdrm->bulk_buf; i < num_pages; i++, ptr += PAGE_SIZE)
415 pages[i] = vmalloc_to_page(ptr);
416
417 ret = sg_alloc_table_from_pages(&gdrm->bulk_sgt, pages, num_pages,
418 0, gdrm->bulk_len, GFP_KERNEL);
419 kfree(pages);
420
421 return ret;
422 }
423
gud_free_buffers_and_mutex(void * data)424 static void gud_free_buffers_and_mutex(void *data)
425 {
426 struct gud_device *gdrm = data;
427
428 vfree(gdrm->compress_buf);
429 gdrm->compress_buf = NULL;
430 sg_free_table(&gdrm->bulk_sgt);
431 vfree(gdrm->bulk_buf);
432 gdrm->bulk_buf = NULL;
433 mutex_destroy(&gdrm->ctrl_lock);
434 }
435
gud_probe(struct usb_interface * intf,const struct usb_device_id * id)436 static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
437 {
438 const struct drm_format_info *xrgb8888_emulation_format = NULL;
439 bool rgb565_supported = false, xrgb8888_supported = false;
440 unsigned int num_formats_dev, num_formats = 0;
441 struct usb_endpoint_descriptor *bulk_out;
442 struct gud_display_descriptor_req desc;
443 struct device *dev = &intf->dev;
444 size_t max_buffer_size = 0;
445 struct gud_device *gdrm;
446 struct drm_device *drm;
447 struct device *dma_dev;
448 u8 *formats_dev;
449 u32 *formats;
450 int ret, i;
451
452 ret = usb_find_bulk_out_endpoint(intf->cur_altsetting, &bulk_out);
453 if (ret)
454 return ret;
455
456 ret = gud_get_display_descriptor(intf, &desc);
457 if (ret) {
458 DRM_DEV_DEBUG_DRIVER(dev, "Not a display interface: ret=%d\n", ret);
459 return -ENODEV;
460 }
461
462 if (desc.version > 1) {
463 dev_err(dev, "Protocol version %u is not supported\n", desc.version);
464 return -ENODEV;
465 }
466
467 gdrm = devm_drm_dev_alloc(dev, &gud_drm_driver, struct gud_device, drm);
468 if (IS_ERR(gdrm))
469 return PTR_ERR(gdrm);
470
471 drm = &gdrm->drm;
472
473 gdrm->flags = le32_to_cpu(desc.flags);
474 gdrm->compression = desc.compression & GUD_COMPRESSION_LZ4;
475
476 if (gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE && gdrm->compression)
477 return -EINVAL;
478
479 mutex_init(&gdrm->ctrl_lock);
480 mutex_init(&gdrm->damage_lock);
481 INIT_WORK(&gdrm->work, gud_flush_work);
482 gud_clear_damage(gdrm);
483
484 ret = devm_add_action(dev, gud_free_buffers_and_mutex, gdrm);
485 if (ret)
486 return ret;
487
488 usb_set_intfdata(intf, gdrm);
489
490 dma_dev = usb_intf_get_dma_device(intf);
491 if (dma_dev) {
492 drm_dev_set_dma_dev(drm, dma_dev);
493 put_device(dma_dev);
494 } else {
495 dev_warn(dev, "buffer sharing not supported"); /* not an error */
496 }
497
498 /* Mode config init */
499 ret = drmm_mode_config_init(drm);
500 if (ret)
501 return ret;
502
503 drm->mode_config.min_width = le32_to_cpu(desc.min_width);
504 drm->mode_config.max_width = le32_to_cpu(desc.max_width);
505 drm->mode_config.min_height = le32_to_cpu(desc.min_height);
506 drm->mode_config.max_height = le32_to_cpu(desc.max_height);
507 drm->mode_config.funcs = &gud_mode_config_funcs;
508 drm->mode_config.helper_private = &gud_mode_config_helpers;
509
510 /* Format init */
511 formats_dev = devm_kmalloc(dev, GUD_FORMATS_MAX_NUM, GFP_KERNEL);
512 /* Add room for emulated XRGB8888 */
513 formats = devm_kmalloc_array(dev, GUD_FORMATS_MAX_NUM + 1, sizeof(*formats), GFP_KERNEL);
514 if (!formats_dev || !formats)
515 return -ENOMEM;
516
517 ret = gud_usb_get(gdrm, GUD_REQ_GET_FORMATS, 0, formats_dev, GUD_FORMATS_MAX_NUM);
518 if (ret < 0)
519 return ret;
520
521 num_formats_dev = ret;
522 for (i = 0; i < num_formats_dev; i++) {
523 const struct drm_format_info *info;
524 size_t fmt_buf_size;
525 u32 format;
526
527 format = gud_to_fourcc(formats_dev[i]);
528 if (!format) {
529 drm_dbg(drm, "Unsupported format: 0x%02x\n", formats_dev[i]);
530 continue;
531 }
532
533 if (format == GUD_DRM_FORMAT_R1)
534 info = &gud_drm_format_r1;
535 else if (format == GUD_DRM_FORMAT_XRGB1111)
536 info = &gud_drm_format_xrgb1111;
537 else
538 info = drm_format_info(format);
539
540 switch (format) {
541 case GUD_DRM_FORMAT_R1:
542 fallthrough;
543 case DRM_FORMAT_R8:
544 fallthrough;
545 case GUD_DRM_FORMAT_XRGB1111:
546 fallthrough;
547 case DRM_FORMAT_RGB332:
548 fallthrough;
549 case DRM_FORMAT_RGB888:
550 if (!xrgb8888_emulation_format)
551 xrgb8888_emulation_format = info;
552 break;
553 case DRM_FORMAT_RGB565:
554 rgb565_supported = true;
555 if (!xrgb8888_emulation_format)
556 xrgb8888_emulation_format = info;
557 break;
558 case DRM_FORMAT_XRGB8888:
559 xrgb8888_supported = true;
560 break;
561 }
562
563 fmt_buf_size = drm_format_info_min_pitch(info, 0, drm->mode_config.max_width) *
564 drm->mode_config.max_height;
565 max_buffer_size = max(max_buffer_size, fmt_buf_size);
566
567 if (format == GUD_DRM_FORMAT_R1 || format == GUD_DRM_FORMAT_XRGB1111)
568 continue; /* Internal not for userspace */
569
570 formats[num_formats++] = format;
571 }
572
573 if (!num_formats && !xrgb8888_emulation_format) {
574 dev_err(dev, "No supported pixel formats found\n");
575 return -EINVAL;
576 }
577
578 /* Prefer speed over color depth */
579 if (rgb565_supported)
580 drm->mode_config.preferred_depth = 16;
581
582 if (!xrgb8888_supported && xrgb8888_emulation_format) {
583 gdrm->xrgb8888_emulation_format = xrgb8888_emulation_format;
584 formats[num_formats++] = DRM_FORMAT_XRGB8888;
585 }
586
587 if (desc.max_buffer_size)
588 max_buffer_size = le32_to_cpu(desc.max_buffer_size);
589 /* Prevent a misbehaving device from allocating loads of RAM. 4096x4096@XRGB8888 = 64 MB */
590 if (max_buffer_size > SZ_64M)
591 max_buffer_size = SZ_64M;
592
593 gdrm->bulk_pipe = usb_sndbulkpipe(interface_to_usbdev(intf), usb_endpoint_num(bulk_out));
594 gdrm->bulk_len = max_buffer_size;
595
596 ret = gud_alloc_bulk_buffer(gdrm);
597 if (ret)
598 return ret;
599
600 if (gdrm->compression & GUD_COMPRESSION_LZ4) {
601 gdrm->lz4_comp_mem = devm_kmalloc(dev, LZ4_MEM_COMPRESS, GFP_KERNEL);
602 if (!gdrm->lz4_comp_mem)
603 return -ENOMEM;
604
605 gdrm->compress_buf = vmalloc(gdrm->bulk_len);
606 if (!gdrm->compress_buf)
607 return -ENOMEM;
608 }
609
610 /* Pipeline init */
611 ret = drm_universal_plane_init(drm, &gdrm->plane, 0,
612 &gud_plane_funcs,
613 formats, num_formats,
614 gud_plane_modifiers,
615 DRM_PLANE_TYPE_PRIMARY, NULL);
616 if (ret)
617 return ret;
618
619 drm_plane_helper_add(&gdrm->plane, &gud_plane_helper_funcs);
620 drm_plane_enable_fb_damage_clips(&gdrm->plane);
621
622 ret = gud_plane_add_properties(gdrm);
623 if (ret) {
624 dev_err(dev, "Failed to add properties (error=%d)\n", ret);
625 return ret;
626 }
627
628 ret = drm_crtc_init_with_planes(drm, &gdrm->crtc, &gdrm->plane, NULL,
629 &gud_crtc_funcs, NULL);
630 if (ret)
631 return ret;
632
633 drm_crtc_helper_add(&gdrm->crtc, &gud_crtc_helper_funcs);
634
635 ret = gud_get_connectors(gdrm);
636 if (ret) {
637 dev_err(dev, "Failed to get connectors (error=%d)\n", ret);
638 return ret;
639 }
640
641 drm_mode_config_reset(drm);
642 drm_kms_helper_poll_init(drm);
643
644 drm_debugfs_add_file(drm, "stats", gud_stats_debugfs, NULL);
645
646 ret = drm_dev_register(drm, 0);
647 if (ret)
648 return ret;
649
650 devm_kfree(dev, formats);
651 devm_kfree(dev, formats_dev);
652
653 drm_client_setup(drm, NULL);
654
655 return 0;
656 }
657
gud_disconnect(struct usb_interface * interface)658 static void gud_disconnect(struct usb_interface *interface)
659 {
660 struct gud_device *gdrm = usb_get_intfdata(interface);
661 struct drm_device *drm = &gdrm->drm;
662
663 drm_kms_helper_poll_fini(drm);
664 drm_dev_unplug(drm);
665 drm_atomic_helper_shutdown(drm);
666 }
667
gud_suspend(struct usb_interface * intf,pm_message_t message)668 static int gud_suspend(struct usb_interface *intf, pm_message_t message)
669 {
670 struct gud_device *gdrm = usb_get_intfdata(intf);
671
672 return drm_mode_config_helper_suspend(&gdrm->drm);
673 }
674
gud_resume(struct usb_interface * intf)675 static int gud_resume(struct usb_interface *intf)
676 {
677 struct gud_device *gdrm = usb_get_intfdata(intf);
678
679 drm_mode_config_helper_resume(&gdrm->drm);
680
681 return 0;
682 }
683
684 static const struct usb_device_id gud_id_table[] = {
685 { USB_DEVICE_INTERFACE_CLASS(0x1d50, 0x614d, USB_CLASS_VENDOR_SPEC) },
686 { USB_DEVICE_INTERFACE_CLASS(0x16d0, 0x10a9, USB_CLASS_VENDOR_SPEC) },
687 { }
688 };
689
690 MODULE_DEVICE_TABLE(usb, gud_id_table);
691
692 static struct usb_driver gud_usb_driver = {
693 .name = "gud",
694 .probe = gud_probe,
695 .disconnect = gud_disconnect,
696 .id_table = gud_id_table,
697 .suspend = gud_suspend,
698 .resume = gud_resume,
699 .reset_resume = gud_resume,
700 };
701
702 module_usb_driver(gud_usb_driver);
703
704 MODULE_AUTHOR("Noralf Trønnes");
705 MODULE_DESCRIPTION("GUD USB Display driver");
706 MODULE_LICENSE("Dual MIT/GPL");
707