summaryrefslogtreecommitdiffstats
path: root/drivers/pnp/pnpacpi/rsparser.c
blob: c02ce0834c2cd5da44b7b1ab04ef949f04b774ce (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
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 */
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include "../base.h"
#include "pnpacpi.h"

static void decode_irq_flags(struct pnp_dev *dev, int flags, u8 *triggering,
			     u8 *polarity, u8 *shareable)
{
	switch (flags & (IORESOURCE_IRQ_LOWLEVEL | IORESOURCE_IRQ_HIGHLEVEL |
			 IORESOURCE_IRQ_LOWEDGE  | IORESOURCE_IRQ_HIGHEDGE)) {
	case IORESOURCE_IRQ_LOWLEVEL:
		*triggering = ACPI_LEVEL_SENSITIVE;
		*polarity = ACPI_ACTIVE_LOW;
		break;
	case IORESOURCE_IRQ_HIGHLEVEL:
		*triggering = ACPI_LEVEL_SENSITIVE;
		*polarity = ACPI_ACTIVE_HIGH;
		break;
	case IORESOURCE_IRQ_LOWEDGE:
		*triggering = ACPI_EDGE_SENSITIVE;
		*polarity = ACPI_ACTIVE_LOW;
		break;
	case IORESOURCE_IRQ_HIGHEDGE:
		*triggering = ACPI_EDGE_SENSITIVE;
		*polarity = ACPI_ACTIVE_HIGH;
		break;
	default:
		dev_err(&dev->dev, "can't encode invalid IRQ mode %#x\n",
			flags);
		*triggering = ACPI_EDGE_SENSITIVE;
		*polarity = ACPI_ACTIVE_HIGH;
		break;
	}

	if (flags & IORESOURCE_IRQ_SHAREABLE)
		*shareable = ACPI_SHARED;
	else
		*shareable = ACPI_EXCLUSIVE;
}

static int dma_flags(struct pnp_dev *dev, int type, int bus_master,
		     int transfer)
{
	int flags = 0;

	if (bus_master)
		flags |= IORESOURCE_DMA_MASTER;
	switch (type) {
	case ACPI_COMPATIBILITY:
		flags |= IORESOURCE_DMA_COMPATIBLE;
		break;
	case ACPI_TYPE_A:
		flags |= IORESOURCE_DMA_TYPEA;
		break;
	case ACPI_TYPE_B:
		flags |= IORESOURCE_DMA_TYPEB;
		break;
	case ACPI_TYPE_F:
		flags |= IORESOURCE_DMA_TYPEF;
		break;
	default:
		/* Set a default value ? */
		flags |= IORESOURCE_DMA_COMPATIBLE;
		dev_err(&dev->dev, "invalid DMA type %d\n", type);
	}
	switch (transfer) {
	case ACPI_TRANSFER_8:
		flags |= IORESOURCE_DMA_8BIT;
		break;
	case ACPI_TRANSFER_8_16:
		flags |= IORESOURCE_DMA_8AND16BIT;
		break;
	case ACPI_TRANSFER_16:
		flags |= IORESOURCE_DMA_16BIT;
		break;
	default:
		/* Set a default value ? */
		flags |= IORESOURCE_DMA_8AND16BIT;
		dev_err(&dev->dev, "invalid DMA transfer type %d\n", transfer);
	}

	return flags;
}

/*
 * Allocated Resources
 */

static void pnpacpi_add_irqresource(struct pnp_dev *dev, struct resource *r)
{
	if (!(r->flags & IORESOURCE_DISABLED))
		pcibios_penalize_isa_irq(r->start, 1);

	pnp_add_resource(dev, r);
}

/*
 * Device CSRs that do not appear in PCI config space should be described
 * via ACPI.  This would normally be done with Address Space Descriptors
 * marked as "consumer-only," but old versions of Windows and Linux ignore
 * the producer/consumer flag, so HP invented a vendor-defined resource to
 * describe the location and size of CSR space.
 */
static struct acpi_vendor_uuid hp_ccsr_uuid = {
	.subtype = 2,
	.data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,
	    0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },
};

static int vendor_resource_matches(struct pnp_dev *dev,
				   struct acpi_resource_vendor_typed *vendor,
				   struct acpi_vendor_uuid *match,
				   int expected_len)
{
	int uuid_len = sizeof(vendor->uuid);
	u8 uuid_subtype = vendor->uuid_subtype;
	u8 *uuid = vendor->uuid;
	int actual_len;

	/* byte_length includes uuid_subtype and uuid */
	actual_len = vendor->byte_length - uuid_len - 1;

	if (uuid_subtype == match->subtype &&
	    uuid_len == sizeof(match->data) &&
	    memcmp(uuid, match->data, uuid_len) == 0) {
		if (expected_len && expected_len != actual_len) {
			dev_err(&dev->dev,
				"wrong vendor descriptor size; expected %d, found %d bytes\n",
				expected_len, actual_len);
			return 0;
		}

		return 1;
	}

	return 0;
}

static void pnpacpi_parse_allocated_vendor(struct pnp_dev *dev,
				    struct acpi_resource_vendor_typed *vendor)
{
	struct { u64 start, length; } range;

	if (vendor_resource_matches(dev, vendor, &hp_ccsr_uuid,
				    sizeof(range))) {
		memcpy(&range, vendor->byte_data, sizeof(range));
		pnp_add_mem_resource(dev, range.start, range.start +
				     range.length - 1, 0);
	}
}

static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
					      void *data)
{
	struct pnp_dev *dev = data;
	struct acpi_resource_dma *dma;
	struct acpi_resource_vendor_typed *vendor_typed;
	struct acpi_resource_gpio *gpio;
	struct resource_win win = {{0}, 0};
	struct resource *r = &win.res;
	int i, flags;

	if (acpi_dev_resource_address_space(res, &win)
	    || acpi_dev_resource_ext_address_space(res, &win)) {
		pnp_add_resource(dev, &win.res);
		return AE_OK;
	}

	r->flags = 0;
	if (acpi_dev_resource_interrupt(res, 0, r)) {
		pnpacpi_add_irqresource(dev, r);
		for (i = 1; acpi_dev_resource_interrupt(res, i, r); i++)
			pnpacpi_add_irqresource(dev, r);

		if (i > 1) {
			/*
			 * The IRQ encoder puts a single interrupt in each
			 * descriptor, so if a _CRS descriptor has more than
			 * one interrupt, we won't be able to re-encode it.
			 */
			if (pnp_can_write(dev)) {
				dev_warn(&dev->dev,
					 "multiple interrupts in _CRS descriptor; configuration can't be changed\n");
				dev->capabilities &= ~PNP_WRITE;
			}
		}
		return AE_OK;
	} else if (acpi_gpio_get_irq_resource(res, &gpio)) {
		/*
		 * If the resource is GpioInt() type then extract the IRQ
		 * from GPIO resource and fill it into IRQ resource type.
		 */
		i = acpi_dev_gpio_irq_get(dev->data, 0);
		if (i >= 0) {
			flags = acpi_dev_irq_flags(gpio->triggering,
						   gpio->polarity,
						   gpio->shareable,
						   gpio->wake_capable);
		} else {
			flags = IORESOURCE_DISABLED;
		}
		pnp_add_irq_resource(dev, i, flags);
		return AE_OK;
	} else if (r->flags & IORESOURCE_DISABLED) {
		pnp_add_irq_resource(dev, 0, IORESOURCE_DISABLED);
		return AE_OK;
	}

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_MEMORY24:
	case ACPI_RESOURCE_TYPE_MEMORY32:
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		if (acpi_dev_resource_memory(res, r))
			pnp_add_resource(dev, r);
		break;
	case ACPI_RESOURCE_TYPE_IO:
	case ACPI_RESOURCE_TYPE_FIXED_IO:
		if (acpi_dev_resource_io(res, r))
			pnp_add_resource(dev, r);
		break;
	case ACPI_RESOURCE_TYPE_DMA:
		dma = &res->data.dma;
		if (dma->channel_count > 0 && dma->channels[0] != (u8) -1)
			flags = dma_flags(dev, dma->type, dma->bus_master,
					  dma->transfer);
		else
			flags = IORESOURCE_DISABLED;
		pnp_add_dma_resource(dev, dma->channels[0], flags);
		break;

	case ACPI_RESOURCE_TYPE_START_DEPENDENT:
	case ACPI_RESOURCE_TYPE_END_DEPENDENT:
		break;

	case ACPI_RESOURCE_TYPE_VENDOR:
		vendor_typed = &res->data.vendor_typed;
		pnpacpi_parse_allocated_vendor(dev, vendor_typed);
		break;

	case ACPI_RESOURCE_TYPE_END_TAG:
		break;

	case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
		break;

	case ACPI_RESOURCE_TYPE_SERIAL_BUS:
		/* serial bus connections (I2C/SPI/UART) are not pnp */
		break;

	default:
		dev_warn(&dev->dev, "unknown resource type %d in _CRS\n",
			 res->type);
		return AE_ERROR;
	}

	return AE_OK;
}

int pnpacpi_parse_allocated_resource(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	acpi_status status;

	pnp_dbg(&dev->dev, "parse allocated resources\n");

	pnp_init_resources(dev);

	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
				     pnpacpi_allocated_resource, dev);

	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND)
			dev_err(&dev->dev, "can't evaluate _CRS: %d", status);
		return -EPERM;
	}
	return 0;
}

static __init void pnpacpi_parse_dma_option(struct pnp_dev *dev,
					    unsigned int option_flags,
					    struct acpi_resource_dma *p)
{
	int i;
	unsigned char map = 0, flags;

	for (i = 0; i < p->channel_count; i++)
		map |= 1 << p->channels[i];

	flags = dma_flags(dev, p->type, p->bus_master, p->transfer);
	pnp_register_dma_resource(dev, option_flags, map, flags);
}

static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev,
					    unsigned int option_flags,
					    struct acpi_resource_irq *p)
{
	int i;
	pnp_irq_mask_t map;
	unsigned char flags;

	bitmap_zero(map.bits, PNP_IRQ_NR);
	for (i = 0; i < p->interrupt_count; i++)
		if (p->interrupts[i])
			__set_bit(p->interrupts[i], map.bits);

	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
	pnp_register_irq_resource(dev, option_flags, &map, flags);
}

static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev,
					unsigned int option_flags,
					struct acpi_resource_extended_irq *p)
{
	int i;
	pnp_irq_mask_t map;
	unsigned char flags;

	bitmap_zero(map.bits, PNP_IRQ_NR);
	for (i = 0; i < p->interrupt_count; i++) {
		if (p->interrupts[i]) {
			if (p->interrupts[i] < PNP_IRQ_NR)
				__set_bit(p->interrupts[i], map.bits);
			else
				dev_err(&dev->dev,
					"ignoring IRQ %d option (too large for %d entry bitmap)\n",
					p->interrupts[i], PNP_IRQ_NR);
		}
	}

	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
	pnp_register_irq_resource(dev, option_flags, &map, flags);
}

static __init void pnpacpi_parse_port_option(struct pnp_dev *dev,
					     unsigned int option_flags,
					     struct acpi_resource_io *io)
{
	unsigned char flags = 0;

	if (io->io_decode == ACPI_DECODE_16)
		flags = IORESOURCE_IO_16BIT_ADDR;
	pnp_register_port_resource(dev, option_flags, io->minimum, io->maximum,
				   io->alignment, io->address_length, flags);
}

static __init void pnpacpi_parse_fixed_port_option(struct pnp_dev *dev,
					unsigned int option_flags,
					struct acpi_resource_fixed_io *io)
{
	pnp_register_port_resource(dev, option_flags, io->address, io->address,
				   0, io->address_length, IORESOURCE_IO_FIXED);
}

static __init void pnpacpi_parse_mem24_option(struct pnp_dev *dev,
					      unsigned int option_flags,
					      struct acpi_resource_memory24 *p)
{
	unsigned char flags = 0;

	if (p->write_protect == ACPI_READ_WRITE_MEMORY)
		flags = IORESOURCE_MEM_WRITEABLE;
	pnp_register_mem_resource(dev, option_flags, p->minimum, p->maximum,
				  p->alignment, p->address_length, flags);
}

static __init void pnpacpi_parse_mem32_option(struct pnp_dev *dev,
					      unsigned int option_flags,
					      struct acpi_resource_memory32 *p)
{
	unsigned char flags = 0;

	if (p->write_protect == ACPI_READ_WRITE_MEMORY)
		flags = IORESOURCE_MEM_WRITEABLE;
	pnp_register_mem_resource(dev, option_flags, p->minimum, p->maximum,
				  p->alignment, p->address_length, flags);
}

static __init void pnpacpi_parse_fixed_mem32_option(struct pnp_dev *dev,
					unsigned int option_flags,
					struct acpi_resource_fixed_memory32 *p)
{
	unsigned char flags = 0;

	if (p->write_protect == ACPI_READ_WRITE_MEMORY)
		flags = IORESOURCE_MEM_WRITEABLE;
	pnp_register_mem_resource(dev, option_flags, p->address, p->address,
				  0, p->address_length, flags);
}

static __init void pnpacpi_parse_address_option(struct pnp_dev *dev,
						unsigned int option_flags,
						struct acpi_resource *r)
{
	struct acpi_resource_address64 addr, *p = &addr;
	acpi_status status;
	unsigned char flags = 0;

	status = acpi_resource_to_address64(r, p);
	if (ACPI_FAILURE(status)) {
		dev_warn(&dev->dev, "can't convert resource type %d\n",
			 r->type);
		return;
	}

	if (p->resource_type == ACPI_MEMORY_RANGE) {
		if (p->info.mem.write_protect == ACPI_READ_WRITE_MEMORY)
			flags = IORESOURCE_MEM_WRITEABLE;
		pnp_register_mem_resource(dev, option_flags, p->address.minimum,
					  p->address.minimum, 0, p->address.address_length,
					  flags);
	} else if (p->resource_type == ACPI_IO_RANGE)
		pnp_register_port_resource(dev, option_flags, p->address.minimum,
					   p->address.minimum, 0, p->address.address_length,
					   IORESOURCE_IO_FIXED);
}

static __init void pnpacpi_parse_ext_address_option(struct pnp_dev *dev,
						    unsigned int option_flags,
						    struct acpi_resource *r)
{
	struct acpi_resource_extended_address64 *p = &r->data.ext_address64;
	unsigned char flags = 0;

	if (p->resource_type == ACPI_MEMORY_RANGE) {
		if (p->info.mem.write_protect == ACPI_READ_WRITE_MEMORY)
			flags = IORESOURCE_MEM_WRITEABLE;
		pnp_register_mem_resource(dev, option_flags, p->address.minimum,
					  p->address.minimum, 0, p->address.address_length,
					  flags);
	} else if (p->resource_type == ACPI_IO_RANGE)
		pnp_register_port_resource(dev, option_flags, p->address.minimum,
					   p->address.minimum, 0, p->address.address_length,
					   IORESOURCE_IO_FIXED);
}

struct acpipnp_parse_option_s {
	struct pnp_dev *dev;
	unsigned int option_flags;
};

static __init acpi_status pnpacpi_option_resource(struct acpi_resource *res,
						  void *data)
{
	int priority;
	struct acpipnp_parse_option_s *parse_data = data;
	struct pnp_dev *dev = parse_data->dev;
	unsigned int option_flags = parse_data->option_flags;

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_IRQ:
		pnpacpi_parse_irq_option(dev, option_flags, &res->data.irq);
		break;

	case ACPI_RESOURCE_TYPE_DMA:
		pnpacpi_parse_dma_option(dev, option_flags, &res->data.dma);
		break;

	case ACPI_RESOURCE_TYPE_START_DEPENDENT:
		switch (res->data.start_dpf.compatibility_priority) {
		case ACPI_GOOD_CONFIGURATION:
			priority = PNP_RES_PRIORITY_PREFERRED;
			break;

		case ACPI_ACCEPTABLE_CONFIGURATION:
			priority = PNP_RES_PRIORITY_ACCEPTABLE;
			break;

		case ACPI_SUB_OPTIMAL_CONFIGURATION:
			priority = PNP_RES_PRIORITY_FUNCTIONAL;
			break;
		default:
			priority = PNP_RES_PRIORITY_INVALID;
			break;
		}
		parse_data->option_flags = pnp_new_dependent_set(dev, priority);
		break;

	case ACPI_RESOURCE_TYPE_END_DEPENDENT:
		parse_data->option_flags = 0;
		break;

	case ACPI_RESOURCE_TYPE_IO:
		pnpacpi_parse_port_option(dev, option_flags, &res->data.io);
		break;

	case ACPI_RESOURCE_TYPE_FIXED_IO:
		pnpacpi_parse_fixed_port_option(dev, option_flags,
					        &res->data.fixed_io);
		break;

	case ACPI_RESOURCE_TYPE_VENDOR:
	case ACPI_RESOURCE_TYPE_END_TAG:
		break;

	case ACPI_RESOURCE_TYPE_MEMORY24:
		pnpacpi_parse_mem24_option(dev, option_flags,
					   &res->data.memory24);
		break;

	case ACPI_RESOURCE_TYPE_MEMORY32:
		pnpacpi_parse_mem32_option(dev, option_flags,
					   &res->data.memory32);
		break;

	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		pnpacpi_parse_fixed_mem32_option(dev, option_flags,
						 &res->data.fixed_memory32);
		break;

	case ACPI_RESOURCE_TYPE_ADDRESS16:
	case ACPI_RESOURCE_TYPE_ADDRESS32:
	case ACPI_RESOURCE_TYPE_ADDRESS64:
		pnpacpi_parse_address_option(dev, option_flags, res);
		break;

	case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
		pnpacpi_parse_ext_address_option(dev, option_flags, res);
		break;

	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
		pnpacpi_parse_ext_irq_option(dev, option_flags,
					     &res->data.extended_irq);
		break;

	case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
		break;

	default:
		dev_warn(&dev->dev, "unknown resource type %d in _PRS\n",
			 res->type);
		return AE_ERROR;
	}

	return AE_OK;
}

int __init pnpacpi_parse_resource_option_data(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	acpi_status status;
	struct acpipnp_parse_option_s parse_data;

	pnp_dbg(&dev->dev, "parse resource options\n");

	parse_data.dev = dev;
	parse_data.option_flags = 0;

	status = acpi_walk_resources(handle, METHOD_NAME__PRS,
				     pnpacpi_option_resource, &parse_data);

	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND)
			dev_err(&dev->dev, "can't evaluate _PRS: %d", status);
		return -EPERM;
	}
	return 0;
}

static int pnpacpi_supported_resource(struct acpi_resource *res)
{
	switch (res->type) {
	case ACPI_RESOURCE_TYPE_IRQ:
	case ACPI_RESOURCE_TYPE_DMA:
	case ACPI_RESOURCE_TYPE_IO:
	case ACPI_RESOURCE_TYPE_FIXED_IO:
	case ACPI_RESOURCE_TYPE_MEMORY24:
	case ACPI_RESOURCE_TYPE_MEMORY32:
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
	case ACPI_RESOURCE_TYPE_ADDRESS16:
	case ACPI_RESOURCE_TYPE_ADDRESS32:
	case ACPI_RESOURCE_TYPE_ADDRESS64:
	case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
		return 1;
	}
	return 0;
}

/*
 * Set resource
 */
static acpi_status pnpacpi_count_resources(struct acpi_resource *res,
					   void *data)
{
	int *res_cnt = data;

	if (pnpacpi_supported_resource(res))
		(*res_cnt)++;
	return AE_OK;
}

static acpi_status pnpacpi_type_resources(struct acpi_resource *res, void *data)
{
	struct acpi_resource **resource = data;

	if (pnpacpi_supported_resource(res)) {
		(*resource)->type = res->type;
		(*resource)->length = sizeof(struct acpi_resource);
		if (res->type == ACPI_RESOURCE_TYPE_IRQ)
			(*resource)->data.irq.descriptor_length =
					res->data.irq.descriptor_length;
		(*resource)++;
	}

	return AE_OK;
}

int pnpacpi_build_resource_template(struct pnp_dev *dev,
				    struct acpi_buffer *buffer)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	struct acpi_resource *resource;
	int res_cnt = 0;
	acpi_status status;

	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
				     pnpacpi_count_resources, &res_cnt);
	if (ACPI_FAILURE(status)) {
		dev_err(&dev->dev, "can't evaluate _CRS: %d\n", status);
		return -EINVAL;
	}
	if (!res_cnt)
		return -EINVAL;
	buffer->length = sizeof(struct acpi_resource) * (res_cnt + 1) + 1;
	buffer->pointer = kzalloc(buffer->length - 1, GFP_KERNEL);
	if (!buffer->pointer)
		return -ENOMEM;

	resource = (struct acpi_resource *)buffer->pointer;
	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
				     pnpacpi_type_resources, &resource);
	if (ACPI_FAILURE(status)) {
		kfree(buffer->pointer);
		dev_err(&dev->dev, "can't evaluate _CRS: %d\n", status);
		return -EINVAL;
	}
	/* resource will pointer the end resource now */
	resource->type = ACPI_RESOURCE_TYPE_END_TAG;
	resource->length = sizeof(struct acpi_resource);

	return 0;
}

static void pnpacpi_encode_irq(struct pnp_dev *dev,
			       struct acpi_resource *resource,
			       struct resource *p)
{
	struct acpi_resource_irq *irq = &resource->data.irq;
	u8 triggering, polarity, shareable;

	if (!pnp_resource_enabled(p)) {
		irq->interrupt_count = 0;
		pnp_dbg(&dev->dev, "  encode irq (%s)\n",
			p ? "disabled" : "missing");
		return;
	}

	decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
	irq->triggering = triggering;
	irq->polarity = polarity;
	irq->shareable = shareable;
	irq->interrupt_count = 1;
	irq->interrupts[0] = p->start;

	pnp_dbg(&dev->dev, "  encode irq %d %s %s %s (%d-byte descriptor)\n",
		(int) p->start,
		triggering == ACPI_LEVEL_SENSITIVE ? "level" : "edge",
		polarity == ACPI_ACTIVE_LOW ? "low" : "high",
		irq->shareable == ACPI_SHARED ? "shared" : "exclusive",
		irq->descriptor_length);
}

static void pnpacpi_encode_ext_irq(struct pnp_dev *dev,
				   struct acpi_resource *resource,
				   struct resource *p)
{
	struct acpi_resource_extended_irq *extended_irq = &resource->data.extended_irq;
	u8 triggering, polarity, shareable;

	if (!pnp_resource_enabled(p)) {
		extended_irq->interrupt_count = 0;
		pnp_dbg(&dev->dev, "  encode extended irq (%s)\n",
			p ? "disabled" : "missing");
		return;
	}

	decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
	extended_irq->producer_consumer = ACPI_CONSUMER;
	extended_irq->triggering = triggering;
	extended_irq->polarity = polarity;
	extended_irq->shareable = shareable;
	extended_irq->interrupt_count = 1;
	extended_irq->interrupts[0] = p->start;

	pnp_dbg(&dev->dev, "  encode irq %d %s %s %s\n", (int) p->start,
		triggering == ACPI_LEVEL_SENSITIVE ? "level" : "edge",
		polarity == ACPI_ACTIVE_LOW ? "low" : "high",
		extended_irq->shareable == ACPI_SHARED ? "shared" : "exclusive");
}

static void pnpacpi_encode_dma(struct pnp_dev *dev,
			       struct acpi_resource *resource,
			       struct resource *p)
{
	struct acpi_resource_dma *dma = &resource->data.dma;

	if (!pnp_resource_enabled(p)) {
		dma->channel_count = 0;
		pnp_dbg(&dev->dev, "  encode dma (%s)\n",
			p ? "disabled" : "missing");
		return;
	}

	/* Note: pnp_assign_dma will copy pnp_dma->flags into p->flags */
	switch (p->flags & IORESOURCE_DMA_SPEED_MASK) {
	case IORESOURCE_DMA_TYPEA:
		dma->type = ACPI_TYPE_A;
		break;
	case IORESOURCE_DMA_TYPEB:
		dma->type = ACPI_TYPE_B;
		break;
	case IORESOURCE_DMA_TYPEF:
		dma->type = ACPI_TYPE_F;
		break;
	default:
		dma->type = ACPI_COMPATIBILITY;
	}

	switch (p->flags & IORESOURCE_DMA_TYPE_MASK) {
	case IORESOURCE_DMA_8BIT:
		dma->transfer = ACPI_TRANSFER_8;
		break;
	case IORESOURCE_DMA_8AND16BIT:
		dma->transfer = ACPI_TRANSFER_8_16;
		break;
	default:
		dma->transfer = ACPI_TRANSFER_16;
	}

	dma->bus_master = !!(p->flags & IORESOURCE_DMA_MASTER);
	dma->channel_count = 1;
	dma->channels[0] = p->start;

	pnp_dbg(&dev->dev, "  encode dma %d "
		"type %#x transfer %#x master %d\n",
		(int) p->start, dma->type, dma->transfer, dma->bus_master);
}

static void pnpacpi_encode_io(struct pnp_dev *dev,
			      struct acpi_resource *resource,
			      struct resource *p)
{
	struct acpi_resource_io *io = &resource->data.io;

	if (pnp_resource_enabled(p)) {
		/* Note: pnp_assign_port copies pnp_port->flags into p->flags */
		io->io_decode = (p->flags & IORESOURCE_IO_16BIT_ADDR) ?
		    ACPI_DECODE_16 : ACPI_DECODE_10;
		io->minimum = p->start;
		io->maximum = p->end;
		io->alignment = 0;	/* Correct? */
		io->address_length = resource_size(p);
	} else {
		io->minimum = 0;
		io->address_length = 0;
	}

	pnp_dbg(&dev->dev, "  encode io %#x-%#x decode %#x\n", io->minimum,
		io->minimum + io->address_length - 1, io->io_decode);
}

static void pnpacpi_encode_fixed_io(struct pnp_dev *dev,
				    struct acpi_resource *resource,
				    struct resource *p)
{
	struct acpi_resource_fixed_io *fixed_io = &resource->data.fixed_io;

	if (pnp_resource_enabled(p)) {
		fixed_io->address = p->start;
		fixed_io->address_length = resource_size(p);
	} else {
		fixed_io->address = 0;
		fixed_io->address_length = 0;
	}

	pnp_dbg(&dev->dev, "  encode fixed_io %#x-%#x\n", fixed_io->address,
		fixed_io->address + fixed_io->address_length - 1);
}

static void pnpacpi_encode_mem24(struct pnp_dev *dev,
				 struct acpi_resource *resource,
				 struct resource *p)
{
	struct acpi_resource_memory24 *memory24 = &resource->data.memory24;

	if (pnp_resource_enabled(p)) {
		/* Note: pnp_assign_mem copies pnp_mem->flags into p->flags */
		memory24->write_protect = p->flags & IORESOURCE_MEM_WRITEABLE ?
		    ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
		memory24->minimum = p->start;
		memory24->maximum = p->end;
		memory24->alignment = 0;
		memory24->address_length = resource_size(p);
	} else {
		memory24->minimum = 0;
		memory24->address_length = 0;
	}

	pnp_dbg(&dev->dev, "  encode mem24 %#x-%#x write_protect %#x\n",
		memory24->minimum,
		memory24->minimum + memory24->address_length - 1,
		memory24->write_protect);
}

static void pnpacpi_encode_mem32(struct pnp_dev *dev,
				 struct acpi_resource *resource,
				 struct resource *p)
{
	struct acpi_resource_memory32 *memory32 = &resource->data.memory32;

	if (pnp_resource_enabled(p)) {
		memory32->write_protect = p->flags & IORESOURCE_MEM_WRITEABLE ?
		    ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
		memory32->minimum = p->start;
		memory32->maximum = p->end;
		memory32->alignment = 0;
		memory32->address_length = resource_size(p);
	} else {
		memory32->minimum = 0;
		memory32->alignment = 0;
	}

	pnp_dbg(&dev->dev, "  encode mem32 %#x-%#x write_protect %#x\n",
		memory32->minimum,
		memory32->minimum + memory32->address_length - 1,
		memory32->write_protect);
}

static void pnpacpi_encode_fixed_mem32(struct pnp_dev *dev,
				       struct acpi_resource *resource,
				       struct resource *p)
{
	struct acpi_resource_fixed_memory32 *fixed_memory32 = &resource->data.fixed_memory32;

	if (pnp_resource_enabled(p)) {
		fixed_memory32->write_protect =
		    p->flags & IORESOURCE_MEM_WRITEABLE ?
		    ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
		fixed_memory32->address = p->start;
		fixed_memory32->address_length = resource_size(p);
	} else {
		fixed_memory32->address = 0;
		fixed_memory32->address_length = 0;
	}

	pnp_dbg(&dev->dev, "  encode fixed_mem32 %#x-%#x write_protect %#x\n",
		fixed_memory32->address,
		fixed_memory32->address + fixed_memory32->address_length - 1,
		fixed_memory32->write_protect);
}

int pnpacpi_encode_resources(struct pnp_dev *dev, struct acpi_buffer *buffer)
{
	int i = 0;
	/* pnpacpi_build_resource_template allocates extra mem */
	int res_cnt = (buffer->length - 1) / sizeof(struct acpi_resource) - 1;
	struct acpi_resource *resource = buffer->pointer;
	unsigned int port = 0, irq = 0, dma = 0, mem = 0;

	pnp_dbg(&dev->dev, "encode %d resources\n", res_cnt);
	while (i < res_cnt) {
		switch (resource->type) {
		case ACPI_RESOURCE_TYPE_IRQ:
			pnpacpi_encode_irq(dev, resource,
			       pnp_get_resource(dev, IORESOURCE_IRQ, irq));
			irq++;
			break;

		case ACPI_RESOURCE_TYPE_DMA:
			pnpacpi_encode_dma(dev, resource,
				pnp_get_resource(dev, IORESOURCE_DMA, dma));
			dma++;
			break;
		case ACPI_RESOURCE_TYPE_IO:
			pnpacpi_encode_io(dev, resource,
				pnp_get_resource(dev, IORESOURCE_IO, port));
			port++;
			break;
		case ACPI_RESOURCE_TYPE_FIXED_IO:
			pnpacpi_encode_fixed_io(dev, resource,
				pnp_get_resource(dev, IORESOURCE_IO, port));
			port++;
			break;
		case ACPI_RESOURCE_TYPE_MEMORY24:
			pnpacpi_encode_mem24(dev, resource,
				pnp_get_resource(dev, IORESOURCE_MEM, mem));
			mem++;
			break;
		case ACPI_RESOURCE_TYPE_MEMORY32:
			pnpacpi_encode_mem32(dev, resource,
				pnp_get_resource(dev, IORESOURCE_MEM, mem));
			mem++;
			break;
		case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
			pnpacpi_encode_fixed_mem32(dev, resource,
				pnp_get_resource(dev, IORESOURCE_MEM, mem));
			mem++;
			break;
		case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
			pnpacpi_encode_ext_irq(dev, resource,
				pnp_get_resource(dev, IORESOURCE_IRQ, irq));
			irq++;
			break;
		case ACPI_RESOURCE_TYPE_START_DEPENDENT:
		case ACPI_RESOURCE_TYPE_END_DEPENDENT:
		case ACPI_RESOURCE_TYPE_VENDOR:
		case ACPI_RESOURCE_TYPE_END_TAG:
		case ACPI_RESOURCE_TYPE_ADDRESS16:
		case ACPI_RESOURCE_TYPE_ADDRESS32:
		case ACPI_RESOURCE_TYPE_ADDRESS64:
		case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
		case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
		default:	/* other type */
			dev_warn(&dev->dev,
				 "can't encode unknown resource type %d\n",
				 resource->type);
			return -EINVAL;
		}
		resource++;
		i++;
	}
	return 0;
}