summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/tiny/gm12u320.c
blob: c5bb683e440c5f5d8ee1ea71cf301de20e3f28c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2019 Hans de Goede <hdegoede@redhat.com>
 */

#include <linux/module.h>
#include <linux/pm.h>
#include <linux/usb.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_fbdev_generic.h>
#include <drm/drm_file.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>

static bool eco_mode;
module_param(eco_mode, bool, 0644);
MODULE_PARM_DESC(eco_mode, "Turn on Eco mode (less bright, more silent)");

#define DRIVER_NAME		"gm12u320"
#define DRIVER_DESC		"Grain Media GM12U320 USB projector display"
#define DRIVER_DATE		"2019"
#define DRIVER_MAJOR		1
#define DRIVER_MINOR		0

/*
 * The DLP has an actual width of 854 pixels, but that is not a multiple
 * of 8, breaking things left and right, so we export a width of 848.
 */
#define GM12U320_USER_WIDTH		848
#define GM12U320_REAL_WIDTH		854
#define GM12U320_HEIGHT			480

#define GM12U320_BLOCK_COUNT		20

#define GM12U320_ERR(fmt, ...) \
	DRM_DEV_ERROR(gm12u320->dev.dev, fmt, ##__VA_ARGS__)

#define MISC_RCV_EPT			1
#define DATA_RCV_EPT			2
#define DATA_SND_EPT			3
#define MISC_SND_EPT			4

#define DATA_BLOCK_HEADER_SIZE		84
#define DATA_BLOCK_CONTENT_SIZE		64512
#define DATA_BLOCK_FOOTER_SIZE		20
#define DATA_BLOCK_SIZE			(DATA_BLOCK_HEADER_SIZE + \
					 DATA_BLOCK_CONTENT_SIZE + \
					 DATA_BLOCK_FOOTER_SIZE)
#define DATA_LAST_BLOCK_CONTENT_SIZE	4032
#define DATA_LAST_BLOCK_SIZE		(DATA_BLOCK_HEADER_SIZE + \
					 DATA_LAST_BLOCK_CONTENT_SIZE + \
					 DATA_BLOCK_FOOTER_SIZE)

#define CMD_SIZE			31
#define READ_STATUS_SIZE		13
#define MISC_VALUE_SIZE			4

#define CMD_TIMEOUT			msecs_to_jiffies(200)
#define DATA_TIMEOUT			msecs_to_jiffies(1000)
#define IDLE_TIMEOUT			msecs_to_jiffies(2000)
#define FIRST_FRAME_TIMEOUT		msecs_to_jiffies(2000)

#define MISC_REQ_GET_SET_ECO_A		0xff
#define MISC_REQ_GET_SET_ECO_B		0x35
/* Windows driver does once every second, with arg d = 1, other args 0 */
#define MISC_REQ_UNKNOWN1_A		0xff
#define MISC_REQ_UNKNOWN1_B		0x38
/* Windows driver does this on init, with arg a, b = 0, c = 0xa0, d = 4 */
#define MISC_REQ_UNKNOWN2_A		0xa5
#define MISC_REQ_UNKNOWN2_B		0x00

struct gm12u320_device {
	struct drm_device	         dev;
	struct device                   *dmadev;
	struct drm_simple_display_pipe   pipe;
	struct drm_connector	         conn;
	unsigned char                   *cmd_buf;
	unsigned char                   *data_buf[GM12U320_BLOCK_COUNT];
	struct {
		struct delayed_work       work;
		struct mutex             lock;
		struct drm_framebuffer  *fb;
		struct drm_rect          rect;
		int frame;
		int draw_status_timeout;
		struct iosys_map src_map;
	} fb_update;
};

#define to_gm12u320(__dev) container_of(__dev, struct gm12u320_device, dev)

static const char cmd_data[CMD_SIZE] = {
	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
	0x68, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x10, 0xff,
	0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x80, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static const char cmd_draw[CMD_SIZE] = {
	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xfe,
	0x00, 0x00, 0x00, 0xc0, 0xd1, 0x05, 0x00, 0x40,
	0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
};

static const char cmd_misc[CMD_SIZE] = {
	0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
	0x04, 0x00, 0x00, 0x00, 0x80, 0x01, 0x10, 0xfd,
	0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static const char data_block_header[DATA_BLOCK_HEADER_SIZE] = {
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x04, 0x15, 0x00, 0x00, 0xfc, 0x00, 0x00,
	0x01, 0x00, 0x00, 0xdb
};

static const char data_last_block_header[DATA_BLOCK_HEADER_SIZE] = {
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x2a, 0x00, 0x20, 0x00, 0xc0, 0x0f, 0x00, 0x00,
	0x01, 0x00, 0x00, 0xd7
};

static const char data_block_footer[DATA_BLOCK_FOOTER_SIZE] = {
	0xfb, 0x14, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x80, 0x00, 0x00, 0x4f
};

static inline struct usb_device *gm12u320_to_usb_device(struct gm12u320_device *gm12u320)
{
	return interface_to_usbdev(to_usb_interface(gm12u320->dev.dev));
}

static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
{
	int i, block_size;
	const char *hdr;

	gm12u320->cmd_buf = drmm_kmalloc(&gm12u320->dev, CMD_SIZE, GFP_KERNEL);
	if (!gm12u320->cmd_buf)
		return -ENOMEM;

	for (i = 0; i < GM12U320_BLOCK_COUNT; i++) {
		if (i == GM12U320_BLOCK_COUNT - 1) {
			block_size = DATA_LAST_BLOCK_SIZE;
			hdr = data_last_block_header;
		} else {
			block_size = DATA_BLOCK_SIZE;
			hdr = data_block_header;
		}

		gm12u320->data_buf[i] = drmm_kzalloc(&gm12u320->dev,
						     block_size, GFP_KERNEL);
		if (!gm12u320->data_buf[i])
			return -ENOMEM;

		memcpy(gm12u320->data_buf[i], hdr, DATA_BLOCK_HEADER_SIZE);
		memcpy(gm12u320->data_buf[i] +
				(block_size - DATA_BLOCK_FOOTER_SIZE),
		       data_block_footer, DATA_BLOCK_FOOTER_SIZE);
	}

	return 0;
}

static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
				 u8 req_a, u8 req_b,
				 u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
{
	struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
	int ret, len;

	memcpy(gm12u320->cmd_buf, &cmd_misc, CMD_SIZE);
	gm12u320->cmd_buf[20] = req_a;
	gm12u320->cmd_buf[21] = req_b;
	gm12u320->cmd_buf[22] = arg_a;
	gm12u320->cmd_buf[23] = arg_b;
	gm12u320->cmd_buf[24] = arg_c;
	gm12u320->cmd_buf[25] = arg_d;

	/* Send request */
	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, MISC_SND_EPT),
			   gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
	if (ret || len != CMD_SIZE) {
		GM12U320_ERR("Misc. req. error %d\n", ret);
		return -EIO;
	}

	/* Read value */
	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
			   gm12u320->cmd_buf, MISC_VALUE_SIZE, &len,
			   DATA_TIMEOUT);
	if (ret || len != MISC_VALUE_SIZE) {
		GM12U320_ERR("Misc. value error %d\n", ret);
		return -EIO;
	}
	/* cmd_buf[0] now contains the read value, which we don't use */

	/* Read status */
	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
			   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
			   CMD_TIMEOUT);
	if (ret || len != READ_STATUS_SIZE) {
		GM12U320_ERR("Misc. status error %d\n", ret);
		return -EIO;
	}

	return 0;
}

static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)
{
	while (len--) {
		*dst++ = *src++;
		*dst++ = *src++;
		*dst++ = *src++;
		src++;
	}
}

static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
{
	int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
	struct drm_framebuffer *fb;
	void *vaddr;
	u8 *src;

	mutex_lock(&gm12u320->fb_update.lock);

	if (!gm12u320->fb_update.fb)
		goto unlock;

	fb = gm12u320->fb_update.fb;
	x1 = gm12u320->fb_update.rect.x1;
	x2 = gm12u320->fb_update.rect.x2;
	y1 = gm12u320->fb_update.rect.y1;
	y2 = gm12u320->fb_update.rect.y2;
	vaddr = gm12u320->fb_update.src_map.vaddr; /* TODO: Use mapping abstraction properly */

	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
	if (ret) {
		GM12U320_ERR("drm_gem_fb_begin_cpu_access err: %d\n", ret);
		goto put_fb;
	}

	src = vaddr + y1 * fb->pitches[0] + x1 * 4;

	x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
	x2 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;

	for (; y1 < y2; y1++) {
		remain = 0;
		len = (x2 - x1) * 3;
		dst_offset = (y1 * GM12U320_REAL_WIDTH + x1) * 3;
		block = dst_offset / DATA_BLOCK_CONTENT_SIZE;
		dst_offset %= DATA_BLOCK_CONTENT_SIZE;

		if ((dst_offset + len) > DATA_BLOCK_CONTENT_SIZE) {
			remain = dst_offset + len - DATA_BLOCK_CONTENT_SIZE;
			len = DATA_BLOCK_CONTENT_SIZE - dst_offset;
		}

		dst_offset += DATA_BLOCK_HEADER_SIZE;
		len /= 3;

		gm12u320_32bpp_to_24bpp_packed(
			gm12u320->data_buf[block] + dst_offset,
			src, len);

		if (remain) {
			block++;
			dst_offset = DATA_BLOCK_HEADER_SIZE;
			gm12u320_32bpp_to_24bpp_packed(
				gm12u320->data_buf[block] + dst_offset,
				src + len * 4, remain / 3);
		}
		src += fb->pitches[0];
	}

	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
put_fb:
	drm_framebuffer_put(fb);
	gm12u320->fb_update.fb = NULL;
unlock:
	mutex_unlock(&gm12u320->fb_update.lock);
}

static void gm12u320_fb_update_work(struct work_struct *work)
{
	struct gm12u320_device *gm12u320 =
		container_of(to_delayed_work(work), struct gm12u320_device,
			     fb_update.work);
	struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
	int block, block_size, len;
	int ret = 0;

	gm12u320_copy_fb_to_blocks(gm12u320);

	for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
		if (block == GM12U320_BLOCK_COUNT - 1)
			block_size = DATA_LAST_BLOCK_SIZE;
		else
			block_size = DATA_BLOCK_SIZE;

		/* Send data command to device */
		memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
		gm12u320->cmd_buf[8] = block_size & 0xff;
		gm12u320->cmd_buf[9] = block_size >> 8;
		gm12u320->cmd_buf[20] = 0xfc - block * 4;
		gm12u320->cmd_buf[21] =
			block | (gm12u320->fb_update.frame << 7);

		ret = usb_bulk_msg(udev,
				   usb_sndbulkpipe(udev, DATA_SND_EPT),
				   gm12u320->cmd_buf, CMD_SIZE, &len,
				   CMD_TIMEOUT);
		if (ret || len != CMD_SIZE)
			goto err;

		/* Send data block to device */
		ret = usb_bulk_msg(udev,
				   usb_sndbulkpipe(udev, DATA_SND_EPT),
				   gm12u320->data_buf[block], block_size,
				   &len, DATA_TIMEOUT);
		if (ret || len != block_size)
			goto err;

		/* Read status */
		ret = usb_bulk_msg(udev,
				   usb_rcvbulkpipe(udev, DATA_RCV_EPT),
				   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
				   CMD_TIMEOUT);
		if (ret || len != READ_STATUS_SIZE)
			goto err;
	}

	/* Send draw command to device */
	memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, DATA_SND_EPT),
			   gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
	if (ret || len != CMD_SIZE)
		goto err;

	/* Read status */
	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, DATA_RCV_EPT),
			   gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
			   gm12u320->fb_update.draw_status_timeout);
	if (ret || len != READ_STATUS_SIZE)
		goto err;

	gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
	gm12u320->fb_update.frame = !gm12u320->fb_update.frame;

	/*
	 * We must draw a frame every 2s otherwise the projector
	 * switches back to showing its logo.
	 */
	queue_delayed_work(system_long_wq, &gm12u320->fb_update.work,
			   IDLE_TIMEOUT);

	return;
err:
	/* Do not log errors caused by module unload or device unplug */
	if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
		GM12U320_ERR("Frame update error: %d\n", ret);
}

static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
				   const struct iosys_map *map,
				   struct drm_rect *dirty)
{
	struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
	struct drm_framebuffer *old_fb = NULL;
	bool wakeup = false;

	mutex_lock(&gm12u320->fb_update.lock);

	if (gm12u320->fb_update.fb != fb) {
		old_fb = gm12u320->fb_update.fb;
		drm_framebuffer_get(fb);
		gm12u320->fb_update.fb = fb;
		gm12u320->fb_update.rect = *dirty;
		gm12u320->fb_update.src_map = *map;
		wakeup = true;
	} else {
		struct drm_rect *rect = &gm12u320->fb_update.rect;

		rect->x1 = min(rect->x1, dirty->x1);
		rect->y1 = min(rect->y1, dirty->y1);
		rect->x2 = max(rect->x2, dirty->x2);
		rect->y2 = max(rect->y2, dirty->y2);
	}

	mutex_unlock(&gm12u320->fb_update.lock);

	if (wakeup)
		mod_delayed_work(system_long_wq, &gm12u320->fb_update.work, 0);

	if (old_fb)
		drm_framebuffer_put(old_fb);
}

static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
{
	struct drm_framebuffer *old_fb;

	cancel_delayed_work_sync(&gm12u320->fb_update.work);

	mutex_lock(&gm12u320->fb_update.lock);
	old_fb = gm12u320->fb_update.fb;
	gm12u320->fb_update.fb = NULL;
	iosys_map_clear(&gm12u320->fb_update.src_map);
	mutex_unlock(&gm12u320->fb_update.lock);

	drm_framebuffer_put(old_fb);
}

static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
{
	return gm12u320_misc_request(gm12u320, MISC_REQ_GET_SET_ECO_A,
				     MISC_REQ_GET_SET_ECO_B, 0x01 /* set */,
				     eco_mode ? 0x01 : 0x00, 0x00, 0x01);
}

/* ------------------------------------------------------------------ */
/* gm12u320 connector						      */

/*
 * We use fake EDID info so that userspace know that it is dealing with
 * an Acer projector, rather then listing this as an "unknown" monitor.
 * Note this assumes this driver is only ever used with the Acer C120, if we
 * add support for other devices the vendor and model should be parameterized.
 */
static struct edid gm12u320_edid = {
	.header		= { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
	.mfg_id		= { 0x04, 0x72 },	/* "ACR" */
	.prod_code	= { 0x20, 0xc1 },	/* C120h */
	.serial		= 0xaa55aa55,
	.mfg_week	= 1,
	.mfg_year	= 16,
	.version	= 1,			/* EDID 1.3 */
	.revision	= 3,			/* EDID 1.3 */
	.input		= 0x08,			/* Analog input */
	.features	= 0x0a,			/* Pref timing in DTD 1 */
	.standard_timings = { { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 },
			      { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 } },
	.detailed_timings = { {
		.pixel_clock = 3383,
		/* hactive = 848, hblank = 256 */
		.data.pixel_data.hactive_lo = 0x50,
		.data.pixel_data.hblank_lo = 0x00,
		.data.pixel_data.hactive_hblank_hi = 0x31,
		/* vactive = 480, vblank = 28 */
		.data.pixel_data.vactive_lo = 0xe0,
		.data.pixel_data.vblank_lo = 0x1c,
		.data.pixel_data.vactive_vblank_hi = 0x10,
		/* hsync offset 40 pw 128, vsync offset 1 pw 4 */
		.data.pixel_data.hsync_offset_lo = 0x28,
		.data.pixel_data.hsync_pulse_width_lo = 0x80,
		.data.pixel_data.vsync_offset_pulse_width_lo = 0x14,
		.data.pixel_data.hsync_vsync_offset_pulse_width_hi = 0x00,
		/* Digital separate syncs, hsync+, vsync+ */
		.data.pixel_data.misc = 0x1e,
	}, {
		.pixel_clock = 0,
		.data.other_data.type = 0xfd, /* Monitor ranges */
		.data.other_data.data.range.min_vfreq = 59,
		.data.other_data.data.range.max_vfreq = 61,
		.data.other_data.data.range.min_hfreq_khz = 29,
		.data.other_data.data.range.max_hfreq_khz = 32,
		.data.other_data.data.range.pixel_clock_mhz = 4, /* 40 MHz */
		.data.other_data.data.range.flags = 0,
		.data.other_data.data.range.formula.cvt = {
			0xa0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 },
	}, {
		.pixel_clock = 0,
		.data.other_data.type = 0xfc, /* Model string */
		.data.other_data.data.str.str = {
			'P', 'r', 'o', 'j', 'e', 'c', 't', 'o', 'r', '\n',
			' ', ' ',  ' ' },
	}, {
		.pixel_clock = 0,
		.data.other_data.type = 0xfe, /* Unspecified text / padding */
		.data.other_data.data.str.str = {
			'\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
			' ', ' ',  ' ' },
	} },
	.checksum = 0x13,
};

static int gm12u320_conn_get_modes(struct drm_connector *connector)
{
	drm_connector_update_edid_property(connector, &gm12u320_edid);
	return drm_add_edid_modes(connector, &gm12u320_edid);
}

static const struct drm_connector_helper_funcs gm12u320_conn_helper_funcs = {
	.get_modes = gm12u320_conn_get_modes,
};

static const struct drm_connector_funcs gm12u320_conn_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = drm_connector_cleanup,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int gm12u320_conn_init(struct gm12u320_device *gm12u320)
{
	drm_connector_helper_add(&gm12u320->conn, &gm12u320_conn_helper_funcs);
	return drm_connector_init(&gm12u320->dev, &gm12u320->conn,
				  &gm12u320_conn_funcs, DRM_MODE_CONNECTOR_VGA);
}

/* ------------------------------------------------------------------ */
/* gm12u320 (simple) display pipe				      */

static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
				 struct drm_crtc_state *crtc_state,
				 struct drm_plane_state *plane_state)
{
	struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
	struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);

	gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
	gm12u320_fb_mark_dirty(plane_state->fb, &shadow_plane_state->data[0], &rect);
}

static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
{
	struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);

	gm12u320_stop_fb_update(gm12u320);
}

static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
				 struct drm_plane_state *old_state)
{
	struct drm_plane_state *state = pipe->plane.state;
	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
	struct drm_rect rect;

	if (drm_atomic_helper_damage_merged(old_state, state, &rect))
		gm12u320_fb_mark_dirty(state->fb, &shadow_plane_state->data[0], &rect);
}

static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
	.enable	    = gm12u320_pipe_enable,
	.disable    = gm12u320_pipe_disable,
	.update	    = gm12u320_pipe_update,
	DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
};

static const uint32_t gm12u320_pipe_formats[] = {
	DRM_FORMAT_XRGB8888,
};

static const uint64_t gm12u320_pipe_modifiers[] = {
	DRM_FORMAT_MOD_LINEAR,
	DRM_FORMAT_MOD_INVALID
};

/*
 * FIXME: Dma-buf sharing requires DMA support by the importing device.
 *        This function is a workaround to make USB devices work as well.
 *        See todo.rst for how to fix the issue in the dma-buf framework.
 */
static struct drm_gem_object *gm12u320_gem_prime_import(struct drm_device *dev,
							struct dma_buf *dma_buf)
{
	struct gm12u320_device *gm12u320 = to_gm12u320(dev);

	if (!gm12u320->dmadev)
		return ERR_PTR(-ENODEV);

	return drm_gem_prime_import_dev(dev, dma_buf, gm12u320->dmadev);
}

DEFINE_DRM_GEM_FOPS(gm12u320_fops);

static const struct drm_driver gm12u320_drm_driver = {
	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,

	.name		 = DRIVER_NAME,
	.desc		 = DRIVER_DESC,
	.date		 = DRIVER_DATE,
	.major		 = DRIVER_MAJOR,
	.minor		 = DRIVER_MINOR,

	.fops		 = &gm12u320_fops,
	DRM_GEM_SHMEM_DRIVER_OPS,
	.gem_prime_import = gm12u320_gem_prime_import,
};

static const struct drm_mode_config_funcs gm12u320_mode_config_funcs = {
	.fb_create = drm_gem_fb_create_with_dirty,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static int gm12u320_usb_probe(struct usb_interface *interface,
			      const struct usb_device_id *id)
{
	struct gm12u320_device *gm12u320;
	struct drm_device *dev;
	int ret;

	/*
	 * The gm12u320 presents itself to the system as 2 usb mass-storage
	 * interfaces, we only care about / need the first one.
	 */
	if (interface->cur_altsetting->desc.bInterfaceNumber != 0)
		return -ENODEV;

	gm12u320 = devm_drm_dev_alloc(&interface->dev, &gm12u320_drm_driver,
				      struct gm12u320_device, dev);
	if (IS_ERR(gm12u320))
		return PTR_ERR(gm12u320);
	dev = &gm12u320->dev;

	gm12u320->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
	if (!gm12u320->dmadev)
		drm_warn(dev, "buffer sharing not supported"); /* not an error */

	INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
	mutex_init(&gm12u320->fb_update.lock);

	ret = drmm_mode_config_init(dev);
	if (ret)
		goto err_put_device;

	dev->mode_config.min_width = GM12U320_USER_WIDTH;
	dev->mode_config.max_width = GM12U320_USER_WIDTH;
	dev->mode_config.min_height = GM12U320_HEIGHT;
	dev->mode_config.max_height = GM12U320_HEIGHT;
	dev->mode_config.funcs = &gm12u320_mode_config_funcs;

	ret = gm12u320_usb_alloc(gm12u320);
	if (ret)
		goto err_put_device;

	ret = gm12u320_set_ecomode(gm12u320);
	if (ret)
		goto err_put_device;

	ret = gm12u320_conn_init(gm12u320);
	if (ret)
		goto err_put_device;

	ret = drm_simple_display_pipe_init(&gm12u320->dev,
					   &gm12u320->pipe,
					   &gm12u320_pipe_funcs,
					   gm12u320_pipe_formats,
					   ARRAY_SIZE(gm12u320_pipe_formats),
					   gm12u320_pipe_modifiers,
					   &gm12u320->conn);
	if (ret)
		goto err_put_device;

	drm_mode_config_reset(dev);

	usb_set_intfdata(interface, dev);
	ret = drm_dev_register(dev, 0);
	if (ret)
		goto err_put_device;

	drm_fbdev_generic_setup(dev, 0);

	return 0;

err_put_device:
	put_device(gm12u320->dmadev);
	return ret;
}

static void gm12u320_usb_disconnect(struct usb_interface *interface)
{
	struct drm_device *dev = usb_get_intfdata(interface);
	struct gm12u320_device *gm12u320 = to_gm12u320(dev);

	put_device(gm12u320->dmadev);
	gm12u320->dmadev = NULL;
	drm_dev_unplug(dev);
	drm_atomic_helper_shutdown(dev);
}

static int gm12u320_suspend(struct usb_interface *interface,
			    pm_message_t message)
{
	struct drm_device *dev = usb_get_intfdata(interface);

	return drm_mode_config_helper_suspend(dev);
}

static int gm12u320_resume(struct usb_interface *interface)
{
	struct drm_device *dev = usb_get_intfdata(interface);
	struct gm12u320_device *gm12u320 = to_gm12u320(dev);

	gm12u320_set_ecomode(gm12u320);

	return drm_mode_config_helper_resume(dev);
}

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(0x1de1, 0xc102) },
	{},
};
MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_driver gm12u320_usb_driver = {
	.name = "gm12u320",
	.probe = gm12u320_usb_probe,
	.disconnect = gm12u320_usb_disconnect,
	.id_table = id_table,
	.suspend = pm_ptr(gm12u320_suspend),
	.resume = pm_ptr(gm12u320_resume),
	.reset_resume = pm_ptr(gm12u320_resume),
};

module_usb_driver(gm12u320_usb_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");