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13#include <linux/string.h>
14#include <linux/platform_device.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/dma-mapping.h>
18#include <linux/bootmem.h>
19#include <linux/err.h>
20#include <linux/slab.h>
21#include <linux/pm_runtime.h>
22
23#include "base.h"
24
25#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
26 driver))
27
28struct device platform_bus = {
29 .init_name = "platform",
30};
31EXPORT_SYMBOL_GPL(platform_bus);
32
33
34
35
36
37
38
39struct resource *platform_get_resource(struct platform_device *dev,
40 unsigned int type, unsigned int num)
41{
42 int i;
43
44 for (i = 0; i < dev->num_resources; i++) {
45 struct resource *r = &dev->resource[i];
46
47 if (type == resource_type(r) && num-- == 0)
48 return r;
49 }
50 return NULL;
51}
52EXPORT_SYMBOL_GPL(platform_get_resource);
53
54
55
56
57
58
59int platform_get_irq(struct platform_device *dev, unsigned int num)
60{
61 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
62
63 return r ? r->start : -ENXIO;
64}
65EXPORT_SYMBOL_GPL(platform_get_irq);
66
67
68
69
70
71
72
73struct resource *platform_get_resource_byname(struct platform_device *dev,
74 unsigned int type,
75 const char *name)
76{
77 int i;
78
79 for (i = 0; i < dev->num_resources; i++) {
80 struct resource *r = &dev->resource[i];
81
82 if (type == resource_type(r) && !strcmp(r->name, name))
83 return r;
84 }
85 return NULL;
86}
87EXPORT_SYMBOL_GPL(platform_get_resource_byname);
88
89
90
91
92
93
94int platform_get_irq_byname(struct platform_device *dev, const char *name)
95{
96 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
97 name);
98
99 return r ? r->start : -ENXIO;
100}
101EXPORT_SYMBOL_GPL(platform_get_irq_byname);
102
103
104
105
106
107
108int platform_add_devices(struct platform_device **devs, int num)
109{
110 int i, ret = 0;
111
112 for (i = 0; i < num; i++) {
113 ret = platform_device_register(devs[i]);
114 if (ret) {
115 while (--i >= 0)
116 platform_device_unregister(devs[i]);
117 break;
118 }
119 }
120
121 return ret;
122}
123EXPORT_SYMBOL_GPL(platform_add_devices);
124
125struct platform_object {
126 struct platform_device pdev;
127 char name[1];
128};
129
130
131
132
133
134
135
136
137void platform_device_put(struct platform_device *pdev)
138{
139 if (pdev)
140 put_device(&pdev->dev);
141}
142EXPORT_SYMBOL_GPL(platform_device_put);
143
144static void platform_device_release(struct device *dev)
145{
146 struct platform_object *pa = container_of(dev, struct platform_object,
147 pdev.dev);
148
149 kfree(pa->pdev.dev.platform_data);
150 kfree(pa->pdev.resource);
151 kfree(pa);
152}
153
154
155
156
157
158
159
160
161
162struct platform_device *platform_device_alloc(const char *name, int id)
163{
164 struct platform_object *pa;
165
166 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
167 if (pa) {
168 strcpy(pa->name, name);
169 pa->pdev.name = pa->name;
170 pa->pdev.id = id;
171 device_initialize(&pa->pdev.dev);
172 pa->pdev.dev.release = platform_device_release;
173 }
174
175 return pa ? &pa->pdev : NULL;
176}
177EXPORT_SYMBOL_GPL(platform_device_alloc);
178
179
180
181
182
183
184
185
186
187
188
189int platform_device_add_resources(struct platform_device *pdev,
190 struct resource *res, unsigned int num)
191{
192 struct resource *r;
193
194 r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL);
195 if (r) {
196 memcpy(r, res, sizeof(struct resource) * num);
197 pdev->resource = r;
198 pdev->num_resources = num;
199 }
200 return r ? 0 : -ENOMEM;
201}
202EXPORT_SYMBOL_GPL(platform_device_add_resources);
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212
213
214int platform_device_add_data(struct platform_device *pdev, const void *data,
215 size_t size)
216{
217 void *d = kmemdup(data, size, GFP_KERNEL);
218
219 if (d) {
220 pdev->dev.platform_data = d;
221 return 0;
222 }
223 return -ENOMEM;
224}
225EXPORT_SYMBOL_GPL(platform_device_add_data);
226
227
228
229
230
231
232
233
234int platform_device_add(struct platform_device *pdev)
235{
236 int i, ret = 0;
237
238 if (!pdev)
239 return -EINVAL;
240
241 if (!pdev->dev.parent)
242 pdev->dev.parent = &platform_bus;
243
244 pdev->dev.bus = &platform_bus_type;
245
246 if (pdev->id != -1)
247 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
248 else
249 dev_set_name(&pdev->dev, "%s", pdev->name);
250
251 for (i = 0; i < pdev->num_resources; i++) {
252 struct resource *p, *r = &pdev->resource[i];
253
254 if (r->name == NULL)
255 r->name = dev_name(&pdev->dev);
256
257 p = r->parent;
258 if (!p) {
259 if (resource_type(r) == IORESOURCE_MEM)
260 p = &iomem_resource;
261 else if (resource_type(r) == IORESOURCE_IO)
262 p = &ioport_resource;
263 }
264
265 if (p && insert_resource(p, r)) {
266 printk(KERN_ERR
267 "%s: failed to claim resource %d\n",
268 dev_name(&pdev->dev), i);
269 ret = -EBUSY;
270 goto failed;
271 }
272 }
273
274 pr_debug("Registering platform device '%s'. Parent at %s\n",
275 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
276
277 ret = device_add(&pdev->dev);
278 if (ret == 0)
279 return ret;
280
281 failed:
282 while (--i >= 0) {
283 struct resource *r = &pdev->resource[i];
284 unsigned long type = resource_type(r);
285
286 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
287 release_resource(r);
288 }
289
290 return ret;
291}
292EXPORT_SYMBOL_GPL(platform_device_add);
293
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298
299
300
301
302void platform_device_del(struct platform_device *pdev)
303{
304 int i;
305
306 if (pdev) {
307 device_del(&pdev->dev);
308
309 for (i = 0; i < pdev->num_resources; i++) {
310 struct resource *r = &pdev->resource[i];
311 unsigned long type = resource_type(r);
312
313 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
314 release_resource(r);
315 }
316 }
317}
318EXPORT_SYMBOL_GPL(platform_device_del);
319
320
321
322
323
324int platform_device_register(struct platform_device *pdev)
325{
326 device_initialize(&pdev->dev);
327 return platform_device_add(pdev);
328}
329EXPORT_SYMBOL_GPL(platform_device_register);
330
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337
338
339void platform_device_unregister(struct platform_device *pdev)
340{
341 platform_device_del(pdev);
342 platform_device_put(pdev);
343}
344EXPORT_SYMBOL_GPL(platform_device_unregister);
345
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365
366struct platform_device *platform_device_register_simple(const char *name,
367 int id,
368 struct resource *res,
369 unsigned int num)
370{
371 struct platform_device *pdev;
372 int retval;
373
374 pdev = platform_device_alloc(name, id);
375 if (!pdev) {
376 retval = -ENOMEM;
377 goto error;
378 }
379
380 if (num) {
381 retval = platform_device_add_resources(pdev, res, num);
382 if (retval)
383 goto error;
384 }
385
386 retval = platform_device_add(pdev);
387 if (retval)
388 goto error;
389
390 return pdev;
391
392error:
393 platform_device_put(pdev);
394 return ERR_PTR(retval);
395}
396EXPORT_SYMBOL_GPL(platform_device_register_simple);
397
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410
411
412struct platform_device *platform_device_register_data(
413 struct device *parent,
414 const char *name, int id,
415 const void *data, size_t size)
416{
417 struct platform_device *pdev;
418 int retval;
419
420 pdev = platform_device_alloc(name, id);
421 if (!pdev) {
422 retval = -ENOMEM;
423 goto error;
424 }
425
426 pdev->dev.parent = parent;
427
428 if (size) {
429 retval = platform_device_add_data(pdev, data, size);
430 if (retval)
431 goto error;
432 }
433
434 retval = platform_device_add(pdev);
435 if (retval)
436 goto error;
437
438 return pdev;
439
440error:
441 platform_device_put(pdev);
442 return ERR_PTR(retval);
443}
444
445static int platform_drv_probe(struct device *_dev)
446{
447 struct platform_driver *drv = to_platform_driver(_dev->driver);
448 struct platform_device *dev = to_platform_device(_dev);
449
450 return drv->probe(dev);
451}
452
453static int platform_drv_probe_fail(struct device *_dev)
454{
455 return -ENXIO;
456}
457
458static int platform_drv_remove(struct device *_dev)
459{
460 struct platform_driver *drv = to_platform_driver(_dev->driver);
461 struct platform_device *dev = to_platform_device(_dev);
462
463 return drv->remove(dev);
464}
465
466static void platform_drv_shutdown(struct device *_dev)
467{
468 struct platform_driver *drv = to_platform_driver(_dev->driver);
469 struct platform_device *dev = to_platform_device(_dev);
470
471 drv->shutdown(dev);
472}
473
474
475
476
477
478int platform_driver_register(struct platform_driver *drv)
479{
480 drv->driver.bus = &platform_bus_type;
481 if (drv->probe)
482 drv->driver.probe = platform_drv_probe;
483 if (drv->remove)
484 drv->driver.remove = platform_drv_remove;
485 if (drv->shutdown)
486 drv->driver.shutdown = platform_drv_shutdown;
487
488 return driver_register(&drv->driver);
489}
490EXPORT_SYMBOL_GPL(platform_driver_register);
491
492
493
494
495
496void platform_driver_unregister(struct platform_driver *drv)
497{
498 driver_unregister(&drv->driver);
499}
500EXPORT_SYMBOL_GPL(platform_driver_unregister);
501
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518
519int __init_or_module platform_driver_probe(struct platform_driver *drv,
520 int (*probe)(struct platform_device *))
521{
522 int retval, code;
523
524
525 drv->driver.suppress_bind_attrs = true;
526
527
528 drv->probe = probe;
529 retval = code = platform_driver_register(drv);
530
531
532
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534
535
536
537 spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
538 drv->probe = NULL;
539 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
540 retval = -ENODEV;
541 drv->driver.probe = platform_drv_probe_fail;
542 spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
543
544 if (code != retval)
545 platform_driver_unregister(drv);
546 return retval;
547}
548EXPORT_SYMBOL_GPL(platform_driver_probe);
549
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554
555
556static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
557 char *buf)
558{
559 struct platform_device *pdev = to_platform_device(dev);
560 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
561
562 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
563}
564
565static struct device_attribute platform_dev_attrs[] = {
566 __ATTR_RO(modalias),
567 __ATTR_NULL,
568};
569
570static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
571{
572 struct platform_device *pdev = to_platform_device(dev);
573
574 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
575 (pdev->id_entry) ? pdev->id_entry->name : pdev->name);
576 return 0;
577}
578
579static const struct platform_device_id *platform_match_id(
580 struct platform_device_id *id,
581 struct platform_device *pdev)
582{
583 while (id->name[0]) {
584 if (strcmp(pdev->name, id->name) == 0) {
585 pdev->id_entry = id;
586 return id;
587 }
588 id++;
589 }
590 return NULL;
591}
592
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603
604
605
606static int platform_match(struct device *dev, struct device_driver *drv)
607{
608 struct platform_device *pdev = to_platform_device(dev);
609 struct platform_driver *pdrv = to_platform_driver(drv);
610
611
612 if (pdrv->id_table)
613 return platform_match_id(pdrv->id_table, pdev) != NULL;
614
615
616 return (strcmp(pdev->name, drv->name) == 0);
617}
618
619#ifdef CONFIG_PM_SLEEP
620
621static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
622{
623 struct platform_driver *pdrv = to_platform_driver(dev->driver);
624 struct platform_device *pdev = to_platform_device(dev);
625 int ret = 0;
626
627 if (dev->driver && pdrv->suspend)
628 ret = pdrv->suspend(pdev, mesg);
629
630 return ret;
631}
632
633static int platform_legacy_resume(struct device *dev)
634{
635 struct platform_driver *pdrv = to_platform_driver(dev->driver);
636 struct platform_device *pdev = to_platform_device(dev);
637 int ret = 0;
638
639 if (dev->driver && pdrv->resume)
640 ret = pdrv->resume(pdev);
641
642 return ret;
643}
644
645static int platform_pm_prepare(struct device *dev)
646{
647 struct device_driver *drv = dev->driver;
648 int ret = 0;
649
650 if (drv && drv->pm && drv->pm->prepare)
651 ret = drv->pm->prepare(dev);
652
653 return ret;
654}
655
656static void platform_pm_complete(struct device *dev)
657{
658 struct device_driver *drv = dev->driver;
659
660 if (drv && drv->pm && drv->pm->complete)
661 drv->pm->complete(dev);
662}
663
664#else
665
666#define platform_pm_prepare NULL
667#define platform_pm_complete NULL
668
669#endif
670
671#ifdef CONFIG_SUSPEND
672
673static int platform_pm_suspend(struct device *dev)
674{
675 struct device_driver *drv = dev->driver;
676 int ret = 0;
677
678 if (!drv)
679 return 0;
680
681 if (drv->pm) {
682 if (drv->pm->suspend)
683 ret = drv->pm->suspend(dev);
684 } else {
685 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
686 }
687
688 return ret;
689}
690
691static int platform_pm_suspend_noirq(struct device *dev)
692{
693 struct device_driver *drv = dev->driver;
694 int ret = 0;
695
696 if (!drv)
697 return 0;
698
699 if (drv->pm) {
700 if (drv->pm->suspend_noirq)
701 ret = drv->pm->suspend_noirq(dev);
702 }
703
704 return ret;
705}
706
707static int platform_pm_resume(struct device *dev)
708{
709 struct device_driver *drv = dev->driver;
710 int ret = 0;
711
712 if (!drv)
713 return 0;
714
715 if (drv->pm) {
716 if (drv->pm->resume)
717 ret = drv->pm->resume(dev);
718 } else {
719 ret = platform_legacy_resume(dev);
720 }
721
722 return ret;
723}
724
725static int platform_pm_resume_noirq(struct device *dev)
726{
727 struct device_driver *drv = dev->driver;
728 int ret = 0;
729
730 if (!drv)
731 return 0;
732
733 if (drv->pm) {
734 if (drv->pm->resume_noirq)
735 ret = drv->pm->resume_noirq(dev);
736 }
737
738 return ret;
739}
740
741#else
742
743#define platform_pm_suspend NULL
744#define platform_pm_resume NULL
745#define platform_pm_suspend_noirq NULL
746#define platform_pm_resume_noirq NULL
747
748#endif
749
750#ifdef CONFIG_HIBERNATION
751
752static int platform_pm_freeze(struct device *dev)
753{
754 struct device_driver *drv = dev->driver;
755 int ret = 0;
756
757 if (!drv)
758 return 0;
759
760 if (drv->pm) {
761 if (drv->pm->freeze)
762 ret = drv->pm->freeze(dev);
763 } else {
764 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
765 }
766
767 return ret;
768}
769
770static int platform_pm_freeze_noirq(struct device *dev)
771{
772 struct device_driver *drv = dev->driver;
773 int ret = 0;
774
775 if (!drv)
776 return 0;
777
778 if (drv->pm) {
779 if (drv->pm->freeze_noirq)
780 ret = drv->pm->freeze_noirq(dev);
781 }
782
783 return ret;
784}
785
786static int platform_pm_thaw(struct device *dev)
787{
788 struct device_driver *drv = dev->driver;
789 int ret = 0;
790
791 if (!drv)
792 return 0;
793
794 if (drv->pm) {
795 if (drv->pm->thaw)
796 ret = drv->pm->thaw(dev);
797 } else {
798 ret = platform_legacy_resume(dev);
799 }
800
801 return ret;
802}
803
804static int platform_pm_thaw_noirq(struct device *dev)
805{
806 struct device_driver *drv = dev->driver;
807 int ret = 0;
808
809 if (!drv)
810 return 0;
811
812 if (drv->pm) {
813 if (drv->pm->thaw_noirq)
814 ret = drv->pm->thaw_noirq(dev);
815 }
816
817 return ret;
818}
819
820static int platform_pm_poweroff(struct device *dev)
821{
822 struct device_driver *drv = dev->driver;
823 int ret = 0;
824
825 if (!drv)
826 return 0;
827
828 if (drv->pm) {
829 if (drv->pm->poweroff)
830 ret = drv->pm->poweroff(dev);
831 } else {
832 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
833 }
834
835 return ret;
836}
837
838static int platform_pm_poweroff_noirq(struct device *dev)
839{
840 struct device_driver *drv = dev->driver;
841 int ret = 0;
842
843 if (!drv)
844 return 0;
845
846 if (drv->pm) {
847 if (drv->pm->poweroff_noirq)
848 ret = drv->pm->poweroff_noirq(dev);
849 }
850
851 return ret;
852}
853
854static int platform_pm_restore(struct device *dev)
855{
856 struct device_driver *drv = dev->driver;
857 int ret = 0;
858
859 if (!drv)
860 return 0;
861
862 if (drv->pm) {
863 if (drv->pm->restore)
864 ret = drv->pm->restore(dev);
865 } else {
866 ret = platform_legacy_resume(dev);
867 }
868
869 return ret;
870}
871
872static int platform_pm_restore_noirq(struct device *dev)
873{
874 struct device_driver *drv = dev->driver;
875 int ret = 0;
876
877 if (!drv)
878 return 0;
879
880 if (drv->pm) {
881 if (drv->pm->restore_noirq)
882 ret = drv->pm->restore_noirq(dev);
883 }
884
885 return ret;
886}
887
888#else
889
890#define platform_pm_freeze NULL
891#define platform_pm_thaw NULL
892#define platform_pm_poweroff NULL
893#define platform_pm_restore NULL
894#define platform_pm_freeze_noirq NULL
895#define platform_pm_thaw_noirq NULL
896#define platform_pm_poweroff_noirq NULL
897#define platform_pm_restore_noirq NULL
898
899#endif
900
901#ifdef CONFIG_PM_RUNTIME
902
903int __weak platform_pm_runtime_suspend(struct device *dev)
904{
905 return -ENOSYS;
906};
907
908int __weak platform_pm_runtime_resume(struct device *dev)
909{
910 return -ENOSYS;
911};
912
913int __weak platform_pm_runtime_idle(struct device *dev)
914{
915 return -ENOSYS;
916};
917
918#else
919
920#define platform_pm_runtime_suspend NULL
921#define platform_pm_runtime_resume NULL
922#define platform_pm_runtime_idle NULL
923
924#endif
925
926static const struct dev_pm_ops platform_dev_pm_ops = {
927 .prepare = platform_pm_prepare,
928 .complete = platform_pm_complete,
929 .suspend = platform_pm_suspend,
930 .resume = platform_pm_resume,
931 .freeze = platform_pm_freeze,
932 .thaw = platform_pm_thaw,
933 .poweroff = platform_pm_poweroff,
934 .restore = platform_pm_restore,
935 .suspend_noirq = platform_pm_suspend_noirq,
936 .resume_noirq = platform_pm_resume_noirq,
937 .freeze_noirq = platform_pm_freeze_noirq,
938 .thaw_noirq = platform_pm_thaw_noirq,
939 .poweroff_noirq = platform_pm_poweroff_noirq,
940 .restore_noirq = platform_pm_restore_noirq,
941 .runtime_suspend = platform_pm_runtime_suspend,
942 .runtime_resume = platform_pm_runtime_resume,
943 .runtime_idle = platform_pm_runtime_idle,
944};
945
946struct bus_type platform_bus_type = {
947 .name = "platform",
948 .dev_attrs = platform_dev_attrs,
949 .match = platform_match,
950 .uevent = platform_uevent,
951 .pm = &platform_dev_pm_ops,
952};
953EXPORT_SYMBOL_GPL(platform_bus_type);
954
955int __init platform_bus_init(void)
956{
957 int error;
958
959 early_platform_cleanup();
960
961 error = device_register(&platform_bus);
962 if (error)
963 return error;
964 error = bus_register(&platform_bus_type);
965 if (error)
966 device_unregister(&platform_bus);
967 return error;
968}
969
970#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
971u64 dma_get_required_mask(struct device *dev)
972{
973 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
974 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
975 u64 mask;
976
977 if (!high_totalram) {
978
979 low_totalram = (1 << (fls(low_totalram) - 1));
980 low_totalram += low_totalram - 1;
981 mask = low_totalram;
982 } else {
983 high_totalram = (1 << (fls(high_totalram) - 1));
984 high_totalram += high_totalram - 1;
985 mask = (((u64)high_totalram) << 32) + 0xffffffff;
986 }
987 return mask;
988}
989EXPORT_SYMBOL_GPL(dma_get_required_mask);
990#endif
991
992static __initdata LIST_HEAD(early_platform_driver_list);
993static __initdata LIST_HEAD(early_platform_device_list);
994
995
996
997
998
999
1000int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1001 char *buf)
1002{
1003 unsigned long index;
1004 int n;
1005
1006
1007
1008
1009 if (!epdrv->list.next) {
1010 INIT_LIST_HEAD(&epdrv->list);
1011 list_add_tail(&epdrv->list, &early_platform_driver_list);
1012 }
1013
1014
1015
1016
1017
1018 n = strlen(epdrv->pdrv->driver.name);
1019 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1020 list_move(&epdrv->list, &early_platform_driver_list);
1021
1022 if (!strcmp(buf, epdrv->pdrv->driver.name))
1023 epdrv->requested_id = -1;
1024 else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10,
1025 &index) == 0)
1026 epdrv->requested_id = index;
1027 else
1028 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1029 }
1030
1031 return 0;
1032}
1033
1034
1035
1036
1037
1038
1039void __init early_platform_add_devices(struct platform_device **devs, int num)
1040{
1041 struct device *dev;
1042 int i;
1043
1044
1045 for (i = 0; i < num; i++) {
1046 dev = &devs[i]->dev;
1047
1048 if (!dev->devres_head.next) {
1049 INIT_LIST_HEAD(&dev->devres_head);
1050 list_add_tail(&dev->devres_head,
1051 &early_platform_device_list);
1052 }
1053 }
1054}
1055
1056
1057
1058
1059
1060void __init early_platform_driver_register_all(char *class_str)
1061{
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076 parse_early_options(class_str);
1077}
1078
1079
1080
1081
1082
1083
1084static __init struct platform_device *
1085early_platform_match(struct early_platform_driver *epdrv, int id)
1086{
1087 struct platform_device *pd;
1088
1089 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1090 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1091 if (pd->id == id)
1092 return pd;
1093
1094 return NULL;
1095}
1096
1097
1098
1099
1100
1101
1102static __init int early_platform_left(struct early_platform_driver *epdrv,
1103 int id)
1104{
1105 struct platform_device *pd;
1106
1107 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1108 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1109 if (pd->id >= id)
1110 return 1;
1111
1112 return 0;
1113}
1114
1115
1116
1117
1118
1119
1120
1121static int __init early_platform_driver_probe_id(char *class_str,
1122 int id,
1123 int nr_probe)
1124{
1125 struct early_platform_driver *epdrv;
1126 struct platform_device *match;
1127 int match_id;
1128 int n = 0;
1129 int left = 0;
1130
1131 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1132
1133 if (strcmp(class_str, epdrv->class_str))
1134 continue;
1135
1136 if (id == -2) {
1137 match_id = epdrv->requested_id;
1138 left = 1;
1139
1140 } else {
1141 match_id = id;
1142 left += early_platform_left(epdrv, id);
1143
1144
1145 switch (epdrv->requested_id) {
1146 case EARLY_PLATFORM_ID_ERROR:
1147 case EARLY_PLATFORM_ID_UNSET:
1148 break;
1149 default:
1150 if (epdrv->requested_id == id)
1151 match_id = EARLY_PLATFORM_ID_UNSET;
1152 }
1153 }
1154
1155 switch (match_id) {
1156 case EARLY_PLATFORM_ID_ERROR:
1157 pr_warning("%s: unable to parse %s parameter\n",
1158 class_str, epdrv->pdrv->driver.name);
1159
1160 case EARLY_PLATFORM_ID_UNSET:
1161 match = NULL;
1162 break;
1163 default:
1164 match = early_platform_match(epdrv, match_id);
1165 }
1166
1167 if (match) {
1168 if (epdrv->pdrv->probe(match))
1169 pr_warning("%s: unable to probe %s early.\n",
1170 class_str, match->name);
1171 else
1172 n++;
1173 }
1174
1175 if (n >= nr_probe)
1176 break;
1177 }
1178
1179 if (left)
1180 return n;
1181 else
1182 return -ENODEV;
1183}
1184
1185
1186
1187
1188
1189
1190
1191int __init early_platform_driver_probe(char *class_str,
1192 int nr_probe,
1193 int user_only)
1194{
1195 int k, n, i;
1196
1197 n = 0;
1198 for (i = -2; n < nr_probe; i++) {
1199 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1200
1201 if (k < 0)
1202 break;
1203
1204 n += k;
1205
1206 if (user_only)
1207 break;
1208 }
1209
1210 return n;
1211}
1212
1213
1214
1215
1216void __init early_platform_cleanup(void)
1217{
1218 struct platform_device *pd, *pd2;
1219
1220
1221 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1222 dev.devres_head) {
1223 list_del(&pd->dev.devres_head);
1224 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1225 }
1226}
1227
1228