summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/mipi-disco-img.c
blob: 92b658f92dc0f1d9123cdcb1d49a130a41f600be (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
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
// SPDX-License-Identifier: GPL-2.0-only
/*
 * MIPI DisCo for Imaging support.
 *
 * Copyright (C) 2023 Intel Corporation
 *
 * Support MIPI DisCo for Imaging by parsing ACPI _CRS CSI-2 records defined in
 * Section 6.4.3.8.2.4 "Camera Serial Interface (CSI-2) Connection Resource
 * Descriptor" of ACPI 6.5 and using device properties defined by the MIPI DisCo
 * for Imaging specification.
 *
 * The implementation looks for the information in the ACPI namespace (CSI-2
 * resource descriptors in _CRS) and constructs software nodes compatible with
 * Documentation/firmware-guide/acpi/dsd/graph.rst to represent the CSI-2
 * connection graph.  The software nodes are then populated with the data
 * extracted from the _CRS CSI-2 resource descriptors and the MIPI DisCo
 * for Imaging device properties present in _DSD for the ACPI device objects
 * with CSI-2 connections.
 */

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/limits.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <media/v4l2-fwnode.h>

#include "internal.h"

static LIST_HEAD(acpi_mipi_crs_csi2_list);

static void acpi_mipi_data_tag(acpi_handle handle, void *context)
{
}

/* Connection data extracted from one _CRS CSI-2 resource descriptor. */
struct crs_csi2_connection {
	struct list_head entry;
	struct acpi_resource_csi2_serialbus csi2_data;
	acpi_handle remote_handle;
	char remote_name[];
};

/* Data extracted from _CRS CSI-2 resource descriptors for one device. */
struct crs_csi2 {
	struct list_head entry;
	acpi_handle handle;
	struct acpi_device_software_nodes *swnodes;
	struct list_head connections;
	u32 port_count;
};

struct csi2_resources_walk_data {
	acpi_handle handle;
	struct list_head connections;
};

static acpi_status parse_csi2_resource(struct acpi_resource *res, void *context)
{
	struct csi2_resources_walk_data *crwd = context;
	struct acpi_resource_csi2_serialbus *csi2_res;
	struct acpi_resource_source *csi2_res_src;
	u16 csi2_res_src_length;
	struct crs_csi2_connection *conn;
	acpi_handle remote_handle;

	if (res->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
		return AE_OK;

	csi2_res = &res->data.csi2_serial_bus;

	if (csi2_res->type != ACPI_RESOURCE_SERIAL_TYPE_CSI2)
		return AE_OK;

	csi2_res_src = &csi2_res->resource_source;
	if (ACPI_FAILURE(acpi_get_handle(NULL, csi2_res_src->string_ptr,
					 &remote_handle))) {
		acpi_handle_debug(crwd->handle,
				  "unable to find resource source\n");
		return AE_OK;
	}
	csi2_res_src_length = csi2_res_src->string_length;
	if (!csi2_res_src_length) {
		acpi_handle_debug(crwd->handle,
				  "invalid resource source string length\n");
		return AE_OK;
	}

	conn = kmalloc(struct_size(conn, remote_name, csi2_res_src_length + 1),
		       GFP_KERNEL);
	if (!conn)
		return AE_OK;

	conn->csi2_data = *csi2_res;
	strscpy(conn->remote_name, csi2_res_src->string_ptr, csi2_res_src_length);
	conn->csi2_data.resource_source.string_ptr = conn->remote_name;
	conn->remote_handle = remote_handle;

	list_add(&conn->entry, &crwd->connections);

	return AE_OK;
}

static struct crs_csi2 *acpi_mipi_add_crs_csi2(acpi_handle handle,
					       struct list_head *list)
{
	struct crs_csi2 *csi2;

	csi2 = kzalloc(sizeof(*csi2), GFP_KERNEL);
	if (!csi2)
		return NULL;

	csi2->handle = handle;
	INIT_LIST_HEAD(&csi2->connections);
	csi2->port_count = 1;

	if (ACPI_FAILURE(acpi_attach_data(handle, acpi_mipi_data_tag, csi2))) {
		kfree(csi2);
		return NULL;
	}

	list_add(&csi2->entry, list);

	return csi2;
}

static struct crs_csi2 *acpi_mipi_get_crs_csi2(acpi_handle handle)
{
	struct crs_csi2 *csi2;

	if (ACPI_FAILURE(acpi_get_data_full(handle, acpi_mipi_data_tag,
					    (void **)&csi2, NULL)))
		return NULL;

	return csi2;
}

static void csi_csr2_release_connections(struct list_head *list)
{
	struct crs_csi2_connection *conn, *conn_tmp;

	list_for_each_entry_safe(conn, conn_tmp, list, entry) {
		list_del(&conn->entry);
		kfree(conn);
	}
}

static void acpi_mipi_del_crs_csi2(struct crs_csi2 *csi2)
{
	list_del(&csi2->entry);
	acpi_detach_data(csi2->handle, acpi_mipi_data_tag);
	kfree(csi2->swnodes);
	csi_csr2_release_connections(&csi2->connections);
	kfree(csi2);
}

/**
 * acpi_mipi_check_crs_csi2 - Look for CSI-2 resources in _CRS
 * @handle: Device object handle to evaluate _CRS for.
 *
 * Find all CSI-2 resource descriptors in the given device's _CRS
 * and collect them into a list.
 */
void acpi_mipi_check_crs_csi2(acpi_handle handle)
{
	struct csi2_resources_walk_data crwd = {
		.handle = handle,
		.connections = LIST_HEAD_INIT(crwd.connections),
	};
	struct crs_csi2 *csi2;

	/*
	 * Avoid allocating _CRS CSI-2 objects for devices without any CSI-2
	 * resource descriptions in _CRS to reduce overhead.
	 */
	acpi_walk_resources(handle, METHOD_NAME__CRS, parse_csi2_resource, &crwd);
	if (list_empty(&crwd.connections))
		return;

	/*
	 * Create a _CRS CSI-2 entry to store the extracted connection
	 * information and add it to the global list.
	 */
	csi2 = acpi_mipi_add_crs_csi2(handle, &acpi_mipi_crs_csi2_list);
	if (!csi2) {
		csi_csr2_release_connections(&crwd.connections);
		return; /* Nothing really can be done about this. */
	}

	list_replace(&crwd.connections, &csi2->connections);
}

#define NO_CSI2_PORT (UINT_MAX - 1)

static void alloc_crs_csi2_swnodes(struct crs_csi2 *csi2)
{
	size_t port_count = csi2->port_count;
	struct acpi_device_software_nodes *swnodes;
	size_t alloc_size;
	unsigned int i;

	/*
	 * Allocate memory for ports, node pointers (number of nodes +
	 * 1 (guardian), nodes (root + number of ports * 2 (because for
	 * every port there is an endpoint)).
	 */
	if (check_mul_overflow(sizeof(*swnodes->ports) +
			       sizeof(*swnodes->nodes) * 2 +
			       sizeof(*swnodes->nodeptrs) * 2,
			       port_count, &alloc_size) ||
	    check_add_overflow(sizeof(*swnodes) +
			       sizeof(*swnodes->nodes) +
			       sizeof(*swnodes->nodeptrs) * 2,
			       alloc_size, &alloc_size)) {
		acpi_handle_info(csi2->handle,
				 "too many _CRS CSI-2 resource handles (%zu)",
				 port_count);
		return;
	}

	swnodes = kmalloc(alloc_size, GFP_KERNEL);
	if (!swnodes)
		return;

	swnodes->ports = (struct acpi_device_software_node_port *)(swnodes + 1);
	swnodes->nodes = (struct software_node *)(swnodes->ports + port_count);
	swnodes->nodeptrs = (const struct software_node **)(swnodes->nodes + 1 +
				2 * port_count);
	swnodes->num_ports = port_count;

	for (i = 0; i < 2 * port_count + 1; i++)
		swnodes->nodeptrs[i] = &swnodes->nodes[i];

	swnodes->nodeptrs[i] = NULL;

	for (i = 0; i < port_count; i++)
		swnodes->ports[i].port_nr = NO_CSI2_PORT;

	csi2->swnodes = swnodes;
}

#define ACPI_CRS_CSI2_PHY_TYPE_C	0
#define ACPI_CRS_CSI2_PHY_TYPE_D	1

static unsigned int next_csi2_port_index(struct acpi_device_software_nodes *swnodes,
					 unsigned int port_nr)
{
	unsigned int i;

	for (i = 0; i < swnodes->num_ports; i++) {
		struct acpi_device_software_node_port *port = &swnodes->ports[i];

		if (port->port_nr == port_nr)
			return i;

		if (port->port_nr == NO_CSI2_PORT) {
			port->port_nr = port_nr;
			return i;
		}
	}

	return NO_CSI2_PORT;
}

/* Print graph port name into a buffer, return non-zero on failure. */
#define GRAPH_PORT_NAME(var, num)					    \
	(snprintf((var), sizeof(var), SWNODE_GRAPH_PORT_NAME_FMT, (num)) >= \
	 sizeof(var))

static void extract_crs_csi2_conn_info(acpi_handle local_handle,
				       struct acpi_device_software_nodes *local_swnodes,
				       struct crs_csi2_connection *conn)
{
	struct crs_csi2 *remote_csi2 = acpi_mipi_get_crs_csi2(conn->remote_handle);
	struct acpi_device_software_nodes *remote_swnodes;
	struct acpi_device_software_node_port *local_port, *remote_port;
	struct software_node *local_node, *remote_node;
	unsigned int local_index, remote_index;
	unsigned int bus_type;

	/*
	 * If the previous steps have failed to make room for a _CRS CSI-2
	 * representation for the remote end of the given connection, skip it.
	 */
	if (!remote_csi2)
		return;

	remote_swnodes = remote_csi2->swnodes;
	if (!remote_swnodes)
		return;

	switch (conn->csi2_data.phy_type) {
	case ACPI_CRS_CSI2_PHY_TYPE_C:
		bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_CPHY;
		break;

	case ACPI_CRS_CSI2_PHY_TYPE_D:
		bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_DPHY;
		break;

	default:
		acpi_handle_info(local_handle, "unknown CSI-2 PHY type %u\n",
				 conn->csi2_data.phy_type);
		return;
	}

	local_index = next_csi2_port_index(local_swnodes,
					   conn->csi2_data.local_port_instance);
	if (WARN_ON_ONCE(local_index >= local_swnodes->num_ports))
		return;

	remote_index = next_csi2_port_index(remote_swnodes,
					    conn->csi2_data.resource_source.index);
	if (WARN_ON_ONCE(remote_index >= remote_swnodes->num_ports))
		return;

	local_port = &local_swnodes->ports[local_index];
	local_node = &local_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(local_index)];
	local_port->crs_csi2_local = true;

	remote_port = &remote_swnodes->ports[remote_index];
	remote_node = &remote_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(remote_index)];

	local_port->remote_ep[0] = SOFTWARE_NODE_REFERENCE(remote_node);
	remote_port->remote_ep[0] = SOFTWARE_NODE_REFERENCE(local_node);

	local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
			PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
						 local_port->remote_ep);

	local_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
			PROPERTY_ENTRY_U32("bus-type", bus_type);

	local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
			PROPERTY_ENTRY_U32("reg", 0);

	local_port->port_props[ACPI_DEVICE_SWNODE_PORT_REG] =
			PROPERTY_ENTRY_U32("reg", conn->csi2_data.local_port_instance);

	if (GRAPH_PORT_NAME(local_port->port_name,
			    conn->csi2_data.local_port_instance))
		acpi_handle_info(local_handle, "local port %u name too long",
				 conn->csi2_data.local_port_instance);

	remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
			PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
						 remote_port->remote_ep);

	remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
			PROPERTY_ENTRY_U32("bus-type", bus_type);

	remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
			PROPERTY_ENTRY_U32("reg", 0);

	remote_port->port_props[ACPI_DEVICE_SWNODE_PORT_REG] =
			PROPERTY_ENTRY_U32("reg", conn->csi2_data.resource_source.index);

	if (GRAPH_PORT_NAME(remote_port->port_name,
			    conn->csi2_data.resource_source.index))
		acpi_handle_info(local_handle, "remote port %u name too long",
				 conn->csi2_data.resource_source.index);
}

static void prepare_crs_csi2_swnodes(struct crs_csi2 *csi2)
{
	struct acpi_device_software_nodes *local_swnodes = csi2->swnodes;
	acpi_handle local_handle = csi2->handle;
	struct crs_csi2_connection *conn;

	/* Bail out if the allocation of swnodes has failed. */
	if (!local_swnodes)
		return;

	list_for_each_entry(conn, &csi2->connections, entry)
		extract_crs_csi2_conn_info(local_handle, local_swnodes, conn);
}

/**
 * acpi_mipi_scan_crs_csi2 - Create ACPI _CRS CSI-2 software nodes
 *
 * Note that this function must be called before any struct acpi_device objects
 * are bound to any ACPI drivers or scan handlers, so it cannot assume the
 * existence of struct acpi_device objects for every device present in the ACPI
 * namespace.
 *
 * acpi_scan_lock in scan.c must be held when calling this function.
 */
void acpi_mipi_scan_crs_csi2(void)
{
	struct crs_csi2 *csi2;
	LIST_HEAD(aux_list);

	/* Count references to each ACPI handle in the CSI-2 connection graph. */
	list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry) {
		struct crs_csi2_connection *conn;

		list_for_each_entry(conn, &csi2->connections, entry) {
			struct crs_csi2 *remote_csi2;

			csi2->port_count++;

			remote_csi2 = acpi_mipi_get_crs_csi2(conn->remote_handle);
			if (remote_csi2) {
				remote_csi2->port_count++;
				continue;
			}
			/*
			 * The remote endpoint has no _CRS CSI-2 list entry yet,
			 * so create one for it and add it to the list.
			 */
			acpi_mipi_add_crs_csi2(conn->remote_handle, &aux_list);
		}
	}
	list_splice(&aux_list, &acpi_mipi_crs_csi2_list);

	/*
	 * Allocate software nodes for representing the CSI-2 information.
	 *
	 * This needs to be done for all of the list entries in one go, because
	 * they may point to each other without restrictions and the next step
	 * relies on the availability of swnodes memory for each list entry.
	 */
	list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry)
		alloc_crs_csi2_swnodes(csi2);

	/*
	 * Set up software node properties using data from _CRS CSI-2 resource
	 * descriptors.
	 */
	list_for_each_entry(csi2, &acpi_mipi_crs_csi2_list, entry)
		prepare_crs_csi2_swnodes(csi2);
}

/*
 * Get the index of the next property in the property array, with a given
 * maximum value.
 */
#define NEXT_PROPERTY(index, max)			\
	(WARN_ON((index) > ACPI_DEVICE_SWNODE_##max) ?	\
	 ACPI_DEVICE_SWNODE_##max : (index)++)

static void init_csi2_port_local(struct acpi_device *adev,
				 struct acpi_device_software_node_port *port,
				 struct fwnode_handle *port_fwnode,
				 unsigned int index)
{
	acpi_handle handle = acpi_device_handle(adev);
	unsigned int num_link_freqs;
	int ret;

	ret = fwnode_property_count_u64(port_fwnode, "mipi-img-link-frequencies");
	if (ret <= 0)
		return;

	num_link_freqs = ret;
	if (num_link_freqs > ACPI_DEVICE_CSI2_DATA_LANES) {
		acpi_handle_info(handle, "Too many link frequencies: %u\n",
				 num_link_freqs);
		num_link_freqs = ACPI_DEVICE_CSI2_DATA_LANES;
	}

	ret = fwnode_property_read_u64_array(port_fwnode,
					     "mipi-img-link-frequencies",
					     port->link_frequencies,
					     num_link_freqs);
	if (ret) {
		acpi_handle_info(handle, "Unable to get link frequencies (%d)\n",
				 ret);
		return;
	}

	port->ep_props[NEXT_PROPERTY(index, EP_LINK_FREQUENCIES)] =
				PROPERTY_ENTRY_U64_ARRAY_LEN("link-frequencies",
							     port->link_frequencies,
							     num_link_freqs);
}

static void init_csi2_port(struct acpi_device *adev,
			   struct acpi_device_software_nodes *swnodes,
			   struct acpi_device_software_node_port *port,
			   struct fwnode_handle *port_fwnode,
			   unsigned int port_index)
{
	unsigned int ep_prop_index = ACPI_DEVICE_SWNODE_EP_CLOCK_LANES;
	acpi_handle handle = acpi_device_handle(adev);
	u8 val[ACPI_DEVICE_CSI2_DATA_LANES];
	int num_lanes = 0;
	int ret;

	if (GRAPH_PORT_NAME(port->port_name, port->port_nr))
		return;

	swnodes->nodes[ACPI_DEVICE_SWNODE_PORT(port_index)] =
			SOFTWARE_NODE(port->port_name, port->port_props,
				      &swnodes->nodes[ACPI_DEVICE_SWNODE_ROOT]);

	ret = fwnode_property_read_u8(port_fwnode, "mipi-img-clock-lane", val);
	if (!ret)
		port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_CLOCK_LANES)] =
			PROPERTY_ENTRY_U32("clock-lanes", val[0]);

	ret = fwnode_property_count_u8(port_fwnode, "mipi-img-data-lanes");
	if (ret > 0) {
		num_lanes = ret;

		if (num_lanes > ACPI_DEVICE_CSI2_DATA_LANES) {
			acpi_handle_info(handle, "Too many data lanes: %u\n",
					 num_lanes);
			num_lanes = ACPI_DEVICE_CSI2_DATA_LANES;
		}

		ret = fwnode_property_read_u8_array(port_fwnode,
						    "mipi-img-data-lanes",
						    val, num_lanes);
		if (!ret) {
			unsigned int i;

			for (i = 0; i < num_lanes; i++)
				port->data_lanes[i] = val[i];

			port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_DATA_LANES)] =
				PROPERTY_ENTRY_U32_ARRAY_LEN("data-lanes",
							     port->data_lanes,
							     num_lanes);
		}
	}

	ret = fwnode_property_count_u8(port_fwnode, "mipi-img-lane-polarities");
	if (ret < 0) {
		acpi_handle_debug(handle, "Lane polarity bytes missing\n");
	} else if (ret * BITS_PER_TYPE(u8) < num_lanes + 1) {
		acpi_handle_info(handle, "Too few lane polarity bits (%zu vs. %d)\n",
				 ret * BITS_PER_TYPE(u8), num_lanes + 1);
	} else {
		unsigned long mask = 0;
		int byte_count = ret;
		unsigned int i;

		/*
		 * The total number of lanes is ACPI_DEVICE_CSI2_DATA_LANES + 1
		 * (data lanes + clock lane).  It is not expected to ever be
		 * greater than the number of bits in an unsigned long
		 * variable, but ensure that this is the case.
		 */
		BUILD_BUG_ON(BITS_PER_TYPE(unsigned long) <= ACPI_DEVICE_CSI2_DATA_LANES);

		if (byte_count > sizeof(mask)) {
			acpi_handle_info(handle, "Too many lane polarities: %d\n",
					 byte_count);
			byte_count = sizeof(mask);
		}
		fwnode_property_read_u8_array(port_fwnode, "mipi-img-lane-polarities",
					      val, byte_count);

		for (i = 0; i < byte_count; i++)
			mask |= (unsigned long)val[i] << BITS_PER_TYPE(u8) * i;

		for (i = 0; i <= num_lanes; i++)
			port->lane_polarities[i] = test_bit(i, &mask);

		port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_LANE_POLARITIES)] =
				PROPERTY_ENTRY_U32_ARRAY_LEN("lane-polarities",
							     port->lane_polarities,
							     num_lanes + 1);
	}

	swnodes->nodes[ACPI_DEVICE_SWNODE_EP(port_index)] =
		SOFTWARE_NODE("endpoint@0", swnodes->ports[port_index].ep_props,
			      &swnodes->nodes[ACPI_DEVICE_SWNODE_PORT(port_index)]);

	if (port->crs_csi2_local)
		init_csi2_port_local(adev, port, port_fwnode, ep_prop_index);
}

#define MIPI_IMG_PORT_PREFIX "mipi-img-port-"

static struct fwnode_handle *get_mipi_port_handle(struct fwnode_handle *adev_fwnode,
						  unsigned int port_nr)
{
	char port_name[sizeof(MIPI_IMG_PORT_PREFIX) + 2];

	if (snprintf(port_name, sizeof(port_name), "%s%u",
		     MIPI_IMG_PORT_PREFIX, port_nr) >= sizeof(port_name))
		return NULL;

	return fwnode_get_named_child_node(adev_fwnode, port_name);
}

static void init_crs_csi2_swnodes(struct crs_csi2 *csi2)
{
	struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER };
	struct acpi_device_software_nodes *swnodes = csi2->swnodes;
	acpi_handle handle = csi2->handle;
	unsigned int prop_index = 0;
	struct fwnode_handle *adev_fwnode;
	struct acpi_device *adev;
	acpi_status status;
	unsigned int i;
	u32 val;
	int ret;

	/*
	 * Bail out if the swnodes are not available (either they have not been
	 * allocated or they have been assigned to the device already).
	 */
	if (!swnodes)
		return;

	adev = acpi_fetch_acpi_dev(handle);
	if (!adev)
		return;

	adev_fwnode = acpi_fwnode_handle(adev);

	/*
	 * If the "rotation" property is not present, but _PLD is there,
	 * evaluate it to get the "rotation" value.
	 */
	if (!fwnode_property_present(adev_fwnode, "rotation")) {
		struct acpi_pld_info *pld;

		status = acpi_get_physical_device_location(handle, &pld);
		if (ACPI_SUCCESS(status)) {
			swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_ROTATION)] =
					PROPERTY_ENTRY_U32("rotation",
							   pld->rotation * 45U);
			kfree(pld);
		}
	}

	if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-clock-frequency", &val))
		swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_CLOCK_FREQUENCY)] =
			PROPERTY_ENTRY_U32("clock-frequency", val);

	if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-led-max-current", &val))
		swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_LED_MAX_MICROAMP)] =
			PROPERTY_ENTRY_U32("led-max-microamp", val);

	if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-flash-max-current", &val))
		swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_FLASH_MAX_MICROAMP)] =
			PROPERTY_ENTRY_U32("flash-max-microamp", val);

	if (!fwnode_property_read_u32(adev_fwnode, "mipi-img-flash-max-timeout-us", &val))
		swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_FLASH_MAX_TIMEOUT_US)] =
			PROPERTY_ENTRY_U32("flash-max-timeout-us", val);

	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_handle_info(handle, "Unable to get the path name\n");
		return;
	}

	swnodes->nodes[ACPI_DEVICE_SWNODE_ROOT] =
			SOFTWARE_NODE(buffer.pointer, swnodes->dev_props, NULL);

	for (i = 0; i < swnodes->num_ports; i++) {
		struct acpi_device_software_node_port *port = &swnodes->ports[i];
		struct fwnode_handle *port_fwnode;

		/*
		 * The MIPI DisCo for Imaging specification defines _DSD device
		 * properties for providing CSI-2 port parameters that can be
		 * accessed through the generic device properties framework.  To
		 * access them, it is first necessary to find the data node
		 * representing the port under the given ACPI device object.
		 */
		port_fwnode = get_mipi_port_handle(adev_fwnode, port->port_nr);
		if (!port_fwnode) {
			acpi_handle_info(handle,
					 "MIPI port name too long for port %u\n",
					 port->port_nr);
			continue;
		}

		init_csi2_port(adev, swnodes, port, port_fwnode, i);

		fwnode_handle_put(port_fwnode);
	}

	ret = software_node_register_node_group(swnodes->nodeptrs);
	if (ret < 0) {
		acpi_handle_info(handle,
				 "Unable to register software nodes (%d)\n", ret);
		return;
	}

	adev->swnodes = swnodes;
	adev_fwnode->secondary = software_node_fwnode(swnodes->nodes);

	/*
	 * Prevents the swnodes from this csi2 entry from being assigned again
	 * or freed prematurely.
	 */
	csi2->swnodes = NULL;
}

/**
 * acpi_mipi_init_crs_csi2_swnodes - Initialize _CRS CSI-2 software nodes
 *
 * Use MIPI DisCo for Imaging device properties to finalize the initialization
 * of CSI-2 software nodes for all ACPI device objects that have been already
 * enumerated.
 */
void acpi_mipi_init_crs_csi2_swnodes(void)
{
	struct crs_csi2 *csi2, *csi2_tmp;

	list_for_each_entry_safe(csi2, csi2_tmp, &acpi_mipi_crs_csi2_list, entry)
		init_crs_csi2_swnodes(csi2);
}

/**
 * acpi_mipi_crs_csi2_cleanup - Free _CRS CSI-2 temporary data
 */
void acpi_mipi_crs_csi2_cleanup(void)
{
	struct crs_csi2 *csi2, *csi2_tmp;

	list_for_each_entry_safe(csi2, csi2_tmp, &acpi_mipi_crs_csi2_list, entry)
		acpi_mipi_del_crs_csi2(csi2);
}

#ifdef CONFIG_X86
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>

/* CPU matches for Dell generations with broken ACPI MIPI DISCO info */
static const struct x86_cpu_id dell_broken_mipi_disco_cpu_gens[] = {
	X86_MATCH_VFM(INTEL_TIGERLAKE, NULL),
	X86_MATCH_VFM(INTEL_TIGERLAKE_L, NULL),
	X86_MATCH_VFM(INTEL_ALDERLAKE, NULL),
	X86_MATCH_VFM(INTEL_ALDERLAKE_L, NULL),
	X86_MATCH_VFM(INTEL_RAPTORLAKE, NULL),
	X86_MATCH_VFM(INTEL_RAPTORLAKE_P, NULL),
	X86_MATCH_VFM(INTEL_RAPTORLAKE_S, NULL),
	{}
};

static const char *strnext(const char *s1, const char *s2)
{
	s1 = strstr(s1, s2);

	if (!s1)
		return NULL;

	return s1 + strlen(s2);
}

/**
 * acpi_graph_ignore_port - Tell whether a port node should be ignored
 * @handle: The ACPI handle of the node (which may be a port node)
 *
 * Return: true if a port node should be ignored and the data to that should
 * come from other sources instead (Windows ACPI definitions and
 * ipu-bridge). This is currently used to ignore bad port nodes related to IPU6
 * ("IPU?") and camera sensor devices ("LNK?") in certain Dell systems with
 * Intel VSC.
 */
bool acpi_graph_ignore_port(acpi_handle handle)
{
	const char *path = NULL, *orig_path;
	static bool dmi_tested, ignore_port;

	if (!dmi_tested) {
		if (dmi_name_in_vendors("Dell Inc.") &&
		    x86_match_cpu(dell_broken_mipi_disco_cpu_gens))
			ignore_port = true;

		dmi_tested = true;
	}

	if (!ignore_port)
		return false;

	/* Check if the device is either "IPU" or "LNK" (sensor). */
	orig_path = acpi_handle_path(handle);
	if (!orig_path)
		return false;
	path = strnext(orig_path, "IPU");
	if (!path)
		path = strnext(orig_path, "LNK");
	if (!path)
		goto out_free;

	if (!(isdigit(path[0]) && path[1] == '.'))
		goto out_free;

	/* Check if the node has a "PRT" prefix. */
	path = strnext(path, "PRT");
	if (path && isdigit(path[0]) && !path[1]) {
		acpi_handle_debug(handle, "ignoring data node\n");

		kfree(orig_path);
		return true;
	}

out_free:
	kfree(orig_path);
	return false;
}
#endif