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1/*
2 * platform.c - platform 'pseudo' bus for legacy devices
3 *
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
6 *
7 * This file is released under the GPLv2
8 *
9 * Please see Documentation/driver-model/platform.txt for more
10 * information.
11 */
12
13#include <linux/string.h>
14#include <linux/platform_device.h>
15#include <linux/of_device.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/dma-mapping.h>
19#include <linux/bootmem.h>
20#include <linux/err.h>
21#include <linux/slab.h>
22#include <linux/pm_runtime.h>
23
24#include "base.h"
25
26#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
27 driver))
28
29struct device platform_bus = {
30 .init_name = "platform",
31};
32EXPORT_SYMBOL_GPL(platform_bus);
33
34/**
35 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
36 * @pdev: platform device
37 *
38 * This is called before platform_device_add() such that any pdev_archdata may
39 * be setup before the platform_notifier is called. So if a user needs to
40 * manipulate any relevant information in the pdev_archdata they can do:
41 *
42 * platform_devic_alloc()
43 * ... manipulate ...
44 * platform_device_add()
45 *
46 * And if they don't care they can just call platform_device_register() and
47 * everything will just work out.
48 */
49void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
50{
51}
52
53/**
54 * platform_get_resource - get a resource for a device
55 * @dev: platform device
56 * @type: resource type
57 * @num: resource index
58 */
59struct resource *platform_get_resource(struct platform_device *dev,
60 unsigned int type, unsigned int num)
61{
62 int i;
63
64 for (i = 0; i < dev->num_resources; i++) {
65 struct resource *r = &dev->resource[i];
66
67 if (type == resource_type(r) && num-- == 0)
68 return r;
69 }
70 return NULL;
71}
72EXPORT_SYMBOL_GPL(platform_get_resource);
73
74/**
75 * platform_get_irq - get an IRQ for a device
76 * @dev: platform device
77 * @num: IRQ number index
78 */
79int platform_get_irq(struct platform_device *dev, unsigned int num)
80{
81 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
82
83 return r ? r->start : -ENXIO;
84}
85EXPORT_SYMBOL_GPL(platform_get_irq);
86
87/**
88 * platform_get_resource_byname - get a resource for a device by name
89 * @dev: platform device
90 * @type: resource type
91 * @name: resource name
92 */
93struct resource *platform_get_resource_byname(struct platform_device *dev,
94 unsigned int type,
95 const char *name)
96{
97 int i;
98
99 for (i = 0; i < dev->num_resources; i++) {
100 struct resource *r = &dev->resource[i];
101
102 if (type == resource_type(r) && !strcmp(r->name, name))
103 return r;
104 }
105 return NULL;
106}
107EXPORT_SYMBOL_GPL(platform_get_resource_byname);
108
109/**
110 * platform_get_irq - get an IRQ for a device
111 * @dev: platform device
112 * @name: IRQ name
113 */
114int platform_get_irq_byname(struct platform_device *dev, const char *name)
115{
116 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
117 name);
118
119 return r ? r->start : -ENXIO;
120}
121EXPORT_SYMBOL_GPL(platform_get_irq_byname);
122
123/**
124 * platform_add_devices - add a numbers of platform devices
125 * @devs: array of platform devices to add
126 * @num: number of platform devices in array
127 */
128int platform_add_devices(struct platform_device **devs, int num)
129{
130 int i, ret = 0;
131
132 for (i = 0; i < num; i++) {
133 ret = platform_device_register(devs[i]);
134 if (ret) {
135 while (--i >= 0)
136 platform_device_unregister(devs[i]);
137 break;
138 }
139 }
140
141 return ret;
142}
143EXPORT_SYMBOL_GPL(platform_add_devices);
144
145struct platform_object {
146 struct platform_device pdev;
147 char name[1];
148};
149
150/**
151 * platform_device_put - destroy a platform device
152 * @pdev: platform device to free
153 *
154 * Free all memory associated with a platform device. This function must
155 * _only_ be externally called in error cases. All other usage is a bug.
156 */
157void platform_device_put(struct platform_device *pdev)
158{
159 if (pdev)
160 put_device(&pdev->dev);
161}
162EXPORT_SYMBOL_GPL(platform_device_put);
163
164static void platform_device_release(struct device *dev)
165{
166 struct platform_object *pa = container_of(dev, struct platform_object,
167 pdev.dev);
168
169 of_device_node_put(&pa->pdev.dev);
170 kfree(pa->pdev.dev.platform_data);
171 kfree(pa->pdev.mfd_cell);
172 kfree(pa->pdev.resource);
173 kfree(pa);
174}
175
176/**
177 * platform_device_alloc - create a platform device
178 * @name: base name of the device we're adding
179 * @id: instance id
180 *
181 * Create a platform device object which can have other objects attached
182 * to it, and which will have attached objects freed when it is released.
183 */
184struct platform_device *platform_device_alloc(const char *name, int id)
185{
186 struct platform_object *pa;
187
188 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
189 if (pa) {
190 strcpy(pa->name, name);
191 pa->pdev.name = pa->name;
192 pa->pdev.id = id;
193 device_initialize(&pa->pdev.dev);
194 pa->pdev.dev.release = platform_device_release;
195 arch_setup_pdev_archdata(&pa->pdev);
196 }
197
198 return pa ? &pa->pdev : NULL;
199}
200EXPORT_SYMBOL_GPL(platform_device_alloc);
201
202/**
203 * platform_device_add_resources - add resources to a platform device
204 * @pdev: platform device allocated by platform_device_alloc to add resources to
205 * @res: set of resources that needs to be allocated for the device
206 * @num: number of resources
207 *
208 * Add a copy of the resources to the platform device. The memory
209 * associated with the resources will be freed when the platform device is
210 * released.
211 */
212int platform_device_add_resources(struct platform_device *pdev,
213 const struct resource *res, unsigned int num)
214{
215 struct resource *r = NULL;
216
217 if (res) {
218 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
219 if (!r)
220 return -ENOMEM;
221 }
222
223 kfree(pdev->resource);
224 pdev->resource = r;
225 pdev->num_resources = num;
226 return 0;
227}
228EXPORT_SYMBOL_GPL(platform_device_add_resources);
229
230/**
231 * platform_device_add_data - add platform-specific data to a platform device
232 * @pdev: platform device allocated by platform_device_alloc to add resources to
233 * @data: platform specific data for this platform device
234 * @size: size of platform specific data
235 *
236 * Add a copy of platform specific data to the platform device's
237 * platform_data pointer. The memory associated with the platform data
238 * will be freed when the platform device is released.
239 */
240int platform_device_add_data(struct platform_device *pdev, const void *data,
241 size_t size)
242{
243 void *d = NULL;
244
245 if (data) {
246 d = kmemdup(data, size, GFP_KERNEL);
247 if (!d)
248 return -ENOMEM;
249 }
250
251 kfree(pdev->dev.platform_data);
252 pdev->dev.platform_data = d;
253 return 0;
254}
255EXPORT_SYMBOL_GPL(platform_device_add_data);
256
257/**
258 * platform_device_add - add a platform device to device hierarchy
259 * @pdev: platform device we're adding
260 *
261 * This is part 2 of platform_device_register(), though may be called
262 * separately _iff_ pdev was allocated by platform_device_alloc().
263 */
264int platform_device_add(struct platform_device *pdev)
265{
266 int i, ret = 0;
267
268 if (!pdev)
269 return -EINVAL;
270
271 if (!pdev->dev.parent)
272 pdev->dev.parent = &platform_bus;
273
274 pdev->dev.bus = &platform_bus_type;
275
276 if (pdev->id != -1)
277 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
278 else
279 dev_set_name(&pdev->dev, "%s", pdev->name);
280
281 for (i = 0; i < pdev->num_resources; i++) {
282 struct resource *p, *r = &pdev->resource[i];
283
284 if (r->name == NULL)
285 r->name = dev_name(&pdev->dev);
286
287 p = r->parent;
288 if (!p) {
289 if (resource_type(r) == IORESOURCE_MEM)
290 p = &iomem_resource;
291 else if (resource_type(r) == IORESOURCE_IO)
292 p = &ioport_resource;
293 }
294
295 if (p && insert_resource(p, r)) {
296 printk(KERN_ERR
297 "%s: failed to claim resource %d\n",
298 dev_name(&pdev->dev), i);
299 ret = -EBUSY;
300 goto failed;
301 }
302 }
303
304 pr_debug("Registering platform device '%s'. Parent at %s\n",
305 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
306
307 ret = device_add(&pdev->dev);
308 if (ret == 0)
309 return ret;
310
311 failed:
312 while (--i >= 0) {
313 struct resource *r = &pdev->resource[i];
314 unsigned long type = resource_type(r);
315
316 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
317 release_resource(r);
318 }
319
320 return ret;
321}
322EXPORT_SYMBOL_GPL(platform_device_add);
323
324/**
325 * platform_device_del - remove a platform-level device
326 * @pdev: platform device we're removing
327 *
328 * Note that this function will also release all memory- and port-based
329 * resources owned by the device (@dev->resource). This function must
330 * _only_ be externally called in error cases. All other usage is a bug.
331 */
332void platform_device_del(struct platform_device *pdev)
333{
334 int i;
335
336 if (pdev) {
337 device_del(&pdev->dev);
338
339 for (i = 0; i < pdev->num_resources; i++) {
340 struct resource *r = &pdev->resource[i];
341 unsigned long type = resource_type(r);
342
343 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
344 release_resource(r);
345 }
346 }
347}
348EXPORT_SYMBOL_GPL(platform_device_del);
349
350/**
351 * platform_device_register - add a platform-level device
352 * @pdev: platform device we're adding
353 */
354int platform_device_register(struct platform_device *pdev)
355{
356 device_initialize(&pdev->dev);
357 arch_setup_pdev_archdata(pdev);
358 return platform_device_add(pdev);
359}
360EXPORT_SYMBOL_GPL(platform_device_register);
361
362/**
363 * platform_device_unregister - unregister a platform-level device
364 * @pdev: platform device we're unregistering
365 *
366 * Unregistration is done in 2 steps. First we release all resources
367 * and remove it from the subsystem, then we drop reference count by
368 * calling platform_device_put().
369 */
370void platform_device_unregister(struct platform_device *pdev)
371{
372 platform_device_del(pdev);
373 platform_device_put(pdev);
374}
375EXPORT_SYMBOL_GPL(platform_device_unregister);
376
377/**
378 * platform_device_register_resndata - add a platform-level device with
379 * resources and platform-specific data
380 *
381 * @parent: parent device for the device we're adding
382 * @name: base name of the device we're adding
383 * @id: instance id
384 * @res: set of resources that needs to be allocated for the device
385 * @num: number of resources
386 * @data: platform specific data for this platform device
387 * @size: size of platform specific data
388 *
389 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
390 */
391struct platform_device *platform_device_register_resndata(
392 struct device *parent,
393 const char *name, int id,
394 const struct resource *res, unsigned int num,
395 const void *data, size_t size)
396{
397 int ret = -ENOMEM;
398 struct platform_device *pdev;
399
400 pdev = platform_device_alloc(name, id);
401 if (!pdev)
402 goto err;
403
404 pdev->dev.parent = parent;
405
406 ret = platform_device_add_resources(pdev, res, num);
407 if (ret)
408 goto err;
409
410 ret = platform_device_add_data(pdev, data, size);
411 if (ret)
412 goto err;
413
414 ret = platform_device_add(pdev);
415 if (ret) {
416err:
417 platform_device_put(pdev);
418 return ERR_PTR(ret);
419 }
420
421 return pdev;
422}
423EXPORT_SYMBOL_GPL(platform_device_register_resndata);
424
425static int platform_drv_probe(struct device *_dev)
426{
427 struct platform_driver *drv = to_platform_driver(_dev->driver);
428 struct platform_device *dev = to_platform_device(_dev);
429
430 return drv->probe(dev);
431}
432
433static int platform_drv_probe_fail(struct device *_dev)
434{
435 return -ENXIO;
436}
437
438static int platform_drv_remove(struct device *_dev)
439{
440 struct platform_driver *drv = to_platform_driver(_dev->driver);
441 struct platform_device *dev = to_platform_device(_dev);
442
443 return drv->remove(dev);
444}
445
446static void platform_drv_shutdown(struct device *_dev)
447{
448 struct platform_driver *drv = to_platform_driver(_dev->driver);
449 struct platform_device *dev = to_platform_device(_dev);
450
451 drv->shutdown(dev);
452}
453
454/**
455 * platform_driver_register - register a driver for platform-level devices
456 * @drv: platform driver structure
457 */
458int platform_driver_register(struct platform_driver *drv)
459{
460 drv->driver.bus = &platform_bus_type;
461 if (drv->probe)
462 drv->driver.probe = platform_drv_probe;
463 if (drv->remove)
464 drv->driver.remove = platform_drv_remove;
465 if (drv->shutdown)
466 drv->driver.shutdown = platform_drv_shutdown;
467
468 return driver_register(&drv->driver);
469}
470EXPORT_SYMBOL_GPL(platform_driver_register);
471
472/**
473 * platform_driver_unregister - unregister a driver for platform-level devices
474 * @drv: platform driver structure
475 */
476void platform_driver_unregister(struct platform_driver *drv)
477{
478 driver_unregister(&drv->driver);
479}
480EXPORT_SYMBOL_GPL(platform_driver_unregister);
481
482/**
483 * platform_driver_probe - register driver for non-hotpluggable device
484 * @drv: platform driver structure
485 * @probe: the driver probe routine, probably from an __init section
486 *
487 * Use this instead of platform_driver_register() when you know the device
488 * is not hotpluggable and has already been registered, and you want to
489 * remove its run-once probe() infrastructure from memory after the driver
490 * has bound to the device.
491 *
492 * One typical use for this would be with drivers for controllers integrated
493 * into system-on-chip processors, where the controller devices have been
494 * configured as part of board setup.
495 *
496 * Returns zero if the driver registered and bound to a device, else returns
497 * a negative error code and with the driver not registered.
498 */
499int __init_or_module platform_driver_probe(struct platform_driver *drv,
500 int (*probe)(struct platform_device *))
501{
502 int retval, code;
503
504 /* make sure driver won't have bind/unbind attributes */
505 drv->driver.suppress_bind_attrs = true;
506
507 /* temporary section violation during probe() */
508 drv->probe = probe;
509 retval = code = platform_driver_register(drv);
510
511 /*
512 * Fixup that section violation, being paranoid about code scanning
513 * the list of drivers in order to probe new devices. Check to see
514 * if the probe was successful, and make sure any forced probes of
515 * new devices fail.
516 */
517 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
518 drv->probe = NULL;
519 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
520 retval = -ENODEV;
521 drv->driver.probe = platform_drv_probe_fail;
522 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
523
524 if (code != retval)
525 platform_driver_unregister(drv);
526 return retval;
527}
528EXPORT_SYMBOL_GPL(platform_driver_probe);
529
530/**
531 * platform_create_bundle - register driver and create corresponding device
532 * @driver: platform driver structure
533 * @probe: the driver probe routine, probably from an __init section
534 * @res: set of resources that needs to be allocated for the device
535 * @n_res: number of resources
536 * @data: platform specific data for this platform device
537 * @size: size of platform specific data
538 *
539 * Use this in legacy-style modules that probe hardware directly and
540 * register a single platform device and corresponding platform driver.
541 *
542 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
543 */
544struct platform_device * __init_or_module platform_create_bundle(
545 struct platform_driver *driver,
546 int (*probe)(struct platform_device *),
547 struct resource *res, unsigned int n_res,
548 const void *data, size_t size)
549{
550 struct platform_device *pdev;
551 int error;
552
553 pdev = platform_device_alloc(driver->driver.name, -1);
554 if (!pdev) {
555 error = -ENOMEM;
556 goto err_out;
557 }
558
559 error = platform_device_add_resources(pdev, res, n_res);
560 if (error)
561 goto err_pdev_put;
562
563 error = platform_device_add_data(pdev, data, size);
564 if (error)
565 goto err_pdev_put;
566
567 error = platform_device_add(pdev);
568 if (error)
569 goto err_pdev_put;
570
571 error = platform_driver_probe(driver, probe);
572 if (error)
573 goto err_pdev_del;
574
575 return pdev;
576
577err_pdev_del:
578 platform_device_del(pdev);
579err_pdev_put:
580 platform_device_put(pdev);
581err_out:
582 return ERR_PTR(error);
583}
584EXPORT_SYMBOL_GPL(platform_create_bundle);
585
586/* modalias support enables more hands-off userspace setup:
587 * (a) environment variable lets new-style hotplug events work once system is
588 * fully running: "modprobe $MODALIAS"
589 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
590 * mishandled before system is fully running: "modprobe $(cat modalias)"
591 */
592static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
593 char *buf)
594{
595 struct platform_device *pdev = to_platform_device(dev);
596 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
597
598 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
599}
600
601static struct device_attribute platform_dev_attrs[] = {
602 __ATTR_RO(modalias),
603 __ATTR_NULL,
604};
605
606static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
607{
608 struct platform_device *pdev = to_platform_device(dev);
609 int rc;
610
611 /* Some devices have extra OF data and an OF-style MODALIAS */
612 rc = of_device_uevent(dev,env);
613 if (rc != -ENODEV)
614 return rc;
615
616 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
617 (pdev->id_entry) ? pdev->id_entry->name : pdev->name);
618 return 0;
619}
620
621static const struct platform_device_id *platform_match_id(
622 const struct platform_device_id *id,
623 struct platform_device *pdev)
624{
625 while (id->name[0]) {
626 if (strcmp(pdev->name, id->name) == 0) {
627 pdev->id_entry = id;
628 return id;
629 }
630 id++;
631 }
632 return NULL;
633}
634
635/**
636 * platform_match - bind platform device to platform driver.
637 * @dev: device.
638 * @drv: driver.
639 *
640 * Platform device IDs are assumed to be encoded like this:
641 * "<name><instance>", where <name> is a short description of the type of
642 * device, like "pci" or "floppy", and <instance> is the enumerated
643 * instance of the device, like '0' or '42'. Driver IDs are simply
644 * "<name>". So, extract the <name> from the platform_device structure,
645 * and compare it against the name of the driver. Return whether they match
646 * or not.
647 */
648static int platform_match(struct device *dev, struct device_driver *drv)
649{
650 struct platform_device *pdev = to_platform_device(dev);
651 struct platform_driver *pdrv = to_platform_driver(drv);
652
653 /* Attempt an OF style match first */
654 if (of_driver_match_device(dev, drv))
655 return 1;
656
657 /* Then try to match against the id table */
658 if (pdrv->id_table)
659 return platform_match_id(pdrv->id_table, pdev) != NULL;
660
661 /* fall-back to driver name match */
662 return (strcmp(pdev->name, drv->name) == 0);
663}
664
665#ifdef CONFIG_PM_SLEEP
666
667static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
668{
669 struct platform_driver *pdrv = to_platform_driver(dev->driver);
670 struct platform_device *pdev = to_platform_device(dev);
671 int ret = 0;
672
673 if (dev->driver && pdrv->suspend)
674 ret = pdrv->suspend(pdev, mesg);
675
676 return ret;
677}
678
679static int platform_legacy_resume(struct device *dev)
680{
681 struct platform_driver *pdrv = to_platform_driver(dev->driver);
682 struct platform_device *pdev = to_platform_device(dev);
683 int ret = 0;
684
685 if (dev->driver && pdrv->resume)
686 ret = pdrv->resume(pdev);
687
688 return ret;
689}
690
691int platform_pm_prepare(struct device *dev)
692{
693 struct device_driver *drv = dev->driver;
694 int ret = 0;
695
696 if (drv && drv->pm && drv->pm->prepare)
697 ret = drv->pm->prepare(dev);
698
699 return ret;
700}
701
702void platform_pm_complete(struct device *dev)
703{
704 struct device_driver *drv = dev->driver;
705
706 if (drv && drv->pm && drv->pm->complete)
707 drv->pm->complete(dev);
708}
709
710#endif /* CONFIG_PM_SLEEP */
711
712#ifdef CONFIG_SUSPEND
713
714int platform_pm_suspend(struct device *dev)
715{
716 struct device_driver *drv = dev->driver;
717 int ret = 0;
718
719 if (!drv)
720 return 0;
721
722 if (drv->pm) {
723 if (drv->pm->suspend)
724 ret = drv->pm->suspend(dev);
725 } else {
726 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
727 }
728
729 return ret;
730}
731
732int platform_pm_suspend_noirq(struct device *dev)
733{
734 struct device_driver *drv = dev->driver;
735 int ret = 0;
736
737 if (!drv)
738 return 0;
739
740 if (drv->pm) {
741 if (drv->pm->suspend_noirq)
742 ret = drv->pm->suspend_noirq(dev);
743 }
744
745 return ret;
746}
747
748int platform_pm_resume(struct device *dev)
749{
750 struct device_driver *drv = dev->driver;
751 int ret = 0;
752
753 if (!drv)
754 return 0;
755
756 if (drv->pm) {
757 if (drv->pm->resume)
758 ret = drv->pm->resume(dev);
759 } else {
760 ret = platform_legacy_resume(dev);
761 }
762
763 return ret;
764}
765
766int platform_pm_resume_noirq(struct device *dev)
767{
768 struct device_driver *drv = dev->driver;
769 int ret = 0;
770
771 if (!drv)
772 return 0;
773
774 if (drv->pm) {
775 if (drv->pm->resume_noirq)
776 ret = drv->pm->resume_noirq(dev);
777 }
778
779 return ret;
780}
781
782#endif /* CONFIG_SUSPEND */
783
784#ifdef CONFIG_HIBERNATE_CALLBACKS
785
786int platform_pm_freeze(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->freeze)
796 ret = drv->pm->freeze(dev);
797 } else {
798 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
799 }
800
801 return ret;
802}
803
804int platform_pm_freeze_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->freeze_noirq)
814 ret = drv->pm->freeze_noirq(dev);
815 }
816
817 return ret;
818}
819
820int platform_pm_thaw(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->thaw)
830 ret = drv->pm->thaw(dev);
831 } else {
832 ret = platform_legacy_resume(dev);
833 }
834
835 return ret;
836}
837
838int platform_pm_thaw_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->thaw_noirq)
848 ret = drv->pm->thaw_noirq(dev);
849 }
850
851 return ret;
852}
853
854int platform_pm_poweroff(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->poweroff)
864 ret = drv->pm->poweroff(dev);
865 } else {
866 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
867 }
868
869 return ret;
870}
871
872int platform_pm_poweroff_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->poweroff_noirq)
882 ret = drv->pm->poweroff_noirq(dev);
883 }
884
885 return ret;
886}
887
888int platform_pm_restore(struct device *dev)
889{
890 struct device_driver *drv = dev->driver;
891 int ret = 0;
892
893 if (!drv)
894 return 0;
895
896 if (drv->pm) {
897 if (drv->pm->restore)
898 ret = drv->pm->restore(dev);
899 } else {
900 ret = platform_legacy_resume(dev);
901 }
902
903 return ret;
904}
905
906int platform_pm_restore_noirq(struct device *dev)
907{
908 struct device_driver *drv = dev->driver;
909 int ret = 0;
910
911 if (!drv)
912 return 0;
913
914 if (drv->pm) {
915 if (drv->pm->restore_noirq)
916 ret = drv->pm->restore_noirq(dev);
917 }
918
919 return ret;
920}
921
922#endif /* CONFIG_HIBERNATE_CALLBACKS */
923
924static const struct dev_pm_ops platform_dev_pm_ops = {
925 .runtime_suspend = pm_generic_runtime_suspend,
926 .runtime_resume = pm_generic_runtime_resume,
927 .runtime_idle = pm_generic_runtime_idle,
928 USE_PLATFORM_PM_SLEEP_OPS
929};
930
931struct bus_type platform_bus_type = {
932 .name = "platform",
933 .dev_attrs = platform_dev_attrs,
934 .match = platform_match,
935 .uevent = platform_uevent,
936 .pm = &platform_dev_pm_ops,
937};
938EXPORT_SYMBOL_GPL(platform_bus_type);
939
940int __init platform_bus_init(void)
941{
942 int error;
943
944 early_platform_cleanup();
945
946 error = device_register(&platform_bus);
947 if (error)
948 return error;
949 error = bus_register(&platform_bus_type);
950 if (error)
951 device_unregister(&platform_bus);
952 return error;
953}
954
955#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
956u64 dma_get_required_mask(struct device *dev)
957{
958 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
959 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
960 u64 mask;
961
962 if (!high_totalram) {
963 /* convert to mask just covering totalram */
964 low_totalram = (1 << (fls(low_totalram) - 1));
965 low_totalram += low_totalram - 1;
966 mask = low_totalram;
967 } else {
968 high_totalram = (1 << (fls(high_totalram) - 1));
969 high_totalram += high_totalram - 1;
970 mask = (((u64)high_totalram) << 32) + 0xffffffff;
971 }
972 return mask;
973}
974EXPORT_SYMBOL_GPL(dma_get_required_mask);
975#endif
976
977static __initdata LIST_HEAD(early_platform_driver_list);
978static __initdata LIST_HEAD(early_platform_device_list);
979
980/**
981 * early_platform_driver_register - register early platform driver
982 * @epdrv: early_platform driver structure
983 * @buf: string passed from early_param()
984 *
985 * Helper function for early_platform_init() / early_platform_init_buffer()
986 */
987int __init early_platform_driver_register(struct early_platform_driver *epdrv,
988 char *buf)
989{
990 char *tmp;
991 int n;
992
993 /* Simply add the driver to the end of the global list.
994 * Drivers will by default be put on the list in compiled-in order.
995 */
996 if (!epdrv->list.next) {
997 INIT_LIST_HEAD(&epdrv->list);
998 list_add_tail(&epdrv->list, &early_platform_driver_list);
999 }
1000
1001 /* If the user has specified device then make sure the driver
1002 * gets prioritized. The driver of the last device specified on
1003 * command line will be put first on the list.
1004 */
1005 n = strlen(epdrv->pdrv->driver.name);
1006 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1007 list_move(&epdrv->list, &early_platform_driver_list);
1008
1009 /* Allow passing parameters after device name */
1010 if (buf[n] == '\0' || buf[n] == ',')
1011 epdrv->requested_id = -1;
1012 else {
1013 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1014 &tmp, 10);
1015
1016 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1017 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1018 n = 0;
1019 } else
1020 n += strcspn(&buf[n + 1], ",") + 1;
1021 }
1022
1023 if (buf[n] == ',')
1024 n++;
1025
1026 if (epdrv->bufsize) {
1027 memcpy(epdrv->buffer, &buf[n],
1028 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1029 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1030 }
1031 }
1032
1033 return 0;
1034}
1035
1036/**
1037 * early_platform_add_devices - adds a number of early platform devices
1038 * @devs: array of early platform devices to add
1039 * @num: number of early platform devices in array
1040 *
1041 * Used by early architecture code to register early platform devices and
1042 * their platform data.
1043 */
1044void __init early_platform_add_devices(struct platform_device **devs, int num)
1045{
1046 struct device *dev;
1047 int i;
1048
1049 /* simply add the devices to list */
1050 for (i = 0; i < num; i++) {
1051 dev = &devs[i]->dev;
1052
1053 if (!dev->devres_head.next) {
1054 INIT_LIST_HEAD(&dev->devres_head);
1055 list_add_tail(&dev->devres_head,
1056 &early_platform_device_list);
1057 }
1058 }
1059}
1060
1061/**
1062 * early_platform_driver_register_all - register early platform drivers
1063 * @class_str: string to identify early platform driver class
1064 *
1065 * Used by architecture code to register all early platform drivers
1066 * for a certain class. If omitted then only early platform drivers
1067 * with matching kernel command line class parameters will be registered.
1068 */
1069void __init early_platform_driver_register_all(char *class_str)
1070{
1071 /* The "class_str" parameter may or may not be present on the kernel
1072 * command line. If it is present then there may be more than one
1073 * matching parameter.
1074 *
1075 * Since we register our early platform drivers using early_param()
1076 * we need to make sure that they also get registered in the case
1077 * when the parameter is missing from the kernel command line.
1078 *
1079 * We use parse_early_options() to make sure the early_param() gets
1080 * called at least once. The early_param() may be called more than
1081 * once since the name of the preferred device may be specified on
1082 * the kernel command line. early_platform_driver_register() handles
1083 * this case for us.
1084 */
1085 parse_early_options(class_str);
1086}
1087
1088/**
1089 * early_platform_match - find early platform device matching driver
1090 * @epdrv: early platform driver structure
1091 * @id: id to match against
1092 */
1093static __init struct platform_device *
1094early_platform_match(struct early_platform_driver *epdrv, int id)
1095{
1096 struct platform_device *pd;
1097
1098 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1099 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1100 if (pd->id == id)
1101 return pd;
1102
1103 return NULL;
1104}
1105
1106/**
1107 * early_platform_left - check if early platform driver has matching devices
1108 * @epdrv: early platform driver structure
1109 * @id: return true if id or above exists
1110 */
1111static __init int early_platform_left(struct early_platform_driver *epdrv,
1112 int id)
1113{
1114 struct platform_device *pd;
1115
1116 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1117 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1118 if (pd->id >= id)
1119 return 1;
1120
1121 return 0;
1122}
1123
1124/**
1125 * early_platform_driver_probe_id - probe drivers matching class_str and id
1126 * @class_str: string to identify early platform driver class
1127 * @id: id to match against
1128 * @nr_probe: number of platform devices to successfully probe before exiting
1129 */
1130static int __init early_platform_driver_probe_id(char *class_str,
1131 int id,
1132 int nr_probe)
1133{
1134 struct early_platform_driver *epdrv;
1135 struct platform_device *match;
1136 int match_id;
1137 int n = 0;
1138 int left = 0;
1139
1140 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1141 /* only use drivers matching our class_str */
1142 if (strcmp(class_str, epdrv->class_str))
1143 continue;
1144
1145 if (id == -2) {
1146 match_id = epdrv->requested_id;
1147 left = 1;
1148
1149 } else {
1150 match_id = id;
1151 left += early_platform_left(epdrv, id);
1152
1153 /* skip requested id */
1154 switch (epdrv->requested_id) {
1155 case EARLY_PLATFORM_ID_ERROR:
1156 case EARLY_PLATFORM_ID_UNSET:
1157 break;
1158 default:
1159 if (epdrv->requested_id == id)
1160 match_id = EARLY_PLATFORM_ID_UNSET;
1161 }
1162 }
1163
1164 switch (match_id) {
1165 case EARLY_PLATFORM_ID_ERROR:
1166 pr_warning("%s: unable to parse %s parameter\n",
1167 class_str, epdrv->pdrv->driver.name);
1168 /* fall-through */
1169 case EARLY_PLATFORM_ID_UNSET:
1170 match = NULL;
1171 break;
1172 default:
1173 match = early_platform_match(epdrv, match_id);
1174 }
1175
1176 if (match) {
1177 /*
1178 * Set up a sensible init_name to enable
1179 * dev_name() and others to be used before the
1180 * rest of the driver core is initialized.
1181 */
1182 if (!match->dev.init_name && slab_is_available()) {
1183 if (match->id != -1)
1184 match->dev.init_name =
1185 kasprintf(GFP_KERNEL, "%s.%d",
1186 match->name,
1187 match->id);
1188 else
1189 match->dev.init_name =
1190 kasprintf(GFP_KERNEL, "%s",
1191 match->name);
1192
1193 if (!match->dev.init_name)
1194 return -ENOMEM;
1195 }
1196
1197 if (epdrv->pdrv->probe(match))
1198 pr_warning("%s: unable to probe %s early.\n",
1199 class_str, match->name);
1200 else
1201 n++;
1202 }
1203
1204 if (n >= nr_probe)
1205 break;
1206 }
1207
1208 if (left)
1209 return n;
1210 else
1211 return -ENODEV;
1212}
1213
1214/**
1215 * early_platform_driver_probe - probe a class of registered drivers
1216 * @class_str: string to identify early platform driver class
1217 * @nr_probe: number of platform devices to successfully probe before exiting
1218 * @user_only: only probe user specified early platform devices
1219 *
1220 * Used by architecture code to probe registered early platform drivers
1221 * within a certain class. For probe to happen a registered early platform
1222 * device matching a registered early platform driver is needed.
1223 */
1224int __init early_platform_driver_probe(char *class_str,
1225 int nr_probe,
1226 int user_only)
1227{
1228 int k, n, i;
1229
1230 n = 0;
1231 for (i = -2; n < nr_probe; i++) {
1232 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1233
1234 if (k < 0)
1235 break;
1236
1237 n += k;
1238
1239 if (user_only)
1240 break;
1241 }
1242
1243 return n;
1244}
1245
1246/**
1247 * early_platform_cleanup - clean up early platform code
1248 */
1249void __init early_platform_cleanup(void)
1250{
1251 struct platform_device *pd, *pd2;
1252
1253 /* clean up the devres list used to chain devices */
1254 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1255 dev.devres_head) {
1256 list_del(&pd->dev.devres_head);
1257 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1258 }
1259}
1260
1/*
2 * platform.c - platform 'pseudo' bus for legacy devices
3 *
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
6 *
7 * This file is released under the GPLv2
8 *
9 * Please see Documentation/driver-model/platform.txt for more
10 * information.
11 */
12
13#include <linux/string.h>
14#include <linux/platform_device.h>
15#include <linux/of_device.h>
16#include <linux/of_irq.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/dma-mapping.h>
20#include <linux/bootmem.h>
21#include <linux/err.h>
22#include <linux/slab.h>
23#include <linux/pm_runtime.h>
24#include <linux/idr.h>
25#include <linux/acpi.h>
26
27#include "base.h"
28#include "power/power.h"
29
30/* For automatically allocated device IDs */
31static DEFINE_IDA(platform_devid_ida);
32
33struct device platform_bus = {
34 .init_name = "platform",
35};
36EXPORT_SYMBOL_GPL(platform_bus);
37
38/**
39 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
40 * @pdev: platform device
41 *
42 * This is called before platform_device_add() such that any pdev_archdata may
43 * be setup before the platform_notifier is called. So if a user needs to
44 * manipulate any relevant information in the pdev_archdata they can do:
45 *
46 * platform_device_alloc()
47 * ... manipulate ...
48 * platform_device_add()
49 *
50 * And if they don't care they can just call platform_device_register() and
51 * everything will just work out.
52 */
53void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
54{
55}
56
57/**
58 * platform_get_resource - get a resource for a device
59 * @dev: platform device
60 * @type: resource type
61 * @num: resource index
62 */
63struct resource *platform_get_resource(struct platform_device *dev,
64 unsigned int type, unsigned int num)
65{
66 int i;
67
68 for (i = 0; i < dev->num_resources; i++) {
69 struct resource *r = &dev->resource[i];
70
71 if (type == resource_type(r) && num-- == 0)
72 return r;
73 }
74 return NULL;
75}
76EXPORT_SYMBOL_GPL(platform_get_resource);
77
78/**
79 * platform_get_irq - get an IRQ for a device
80 * @dev: platform device
81 * @num: IRQ number index
82 */
83int platform_get_irq(struct platform_device *dev, unsigned int num)
84{
85#ifdef CONFIG_SPARC
86 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
87 if (!dev || num >= dev->archdata.num_irqs)
88 return -ENXIO;
89 return dev->archdata.irqs[num];
90#else
91 struct resource *r;
92 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node)
93 return of_irq_get(dev->dev.of_node, num);
94
95 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
96
97 return r ? r->start : -ENXIO;
98#endif
99}
100EXPORT_SYMBOL_GPL(platform_get_irq);
101
102/**
103 * platform_get_resource_byname - get a resource for a device by name
104 * @dev: platform device
105 * @type: resource type
106 * @name: resource name
107 */
108struct resource *platform_get_resource_byname(struct platform_device *dev,
109 unsigned int type,
110 const char *name)
111{
112 int i;
113
114 for (i = 0; i < dev->num_resources; i++) {
115 struct resource *r = &dev->resource[i];
116
117 if (unlikely(!r->name))
118 continue;
119
120 if (type == resource_type(r) && !strcmp(r->name, name))
121 return r;
122 }
123 return NULL;
124}
125EXPORT_SYMBOL_GPL(platform_get_resource_byname);
126
127/**
128 * platform_get_irq_byname - get an IRQ for a device by name
129 * @dev: platform device
130 * @name: IRQ name
131 */
132int platform_get_irq_byname(struct platform_device *dev, const char *name)
133{
134 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
135 name);
136
137 return r ? r->start : -ENXIO;
138}
139EXPORT_SYMBOL_GPL(platform_get_irq_byname);
140
141/**
142 * platform_add_devices - add a numbers of platform devices
143 * @devs: array of platform devices to add
144 * @num: number of platform devices in array
145 */
146int platform_add_devices(struct platform_device **devs, int num)
147{
148 int i, ret = 0;
149
150 for (i = 0; i < num; i++) {
151 ret = platform_device_register(devs[i]);
152 if (ret) {
153 while (--i >= 0)
154 platform_device_unregister(devs[i]);
155 break;
156 }
157 }
158
159 return ret;
160}
161EXPORT_SYMBOL_GPL(platform_add_devices);
162
163struct platform_object {
164 struct platform_device pdev;
165 char name[1];
166};
167
168/**
169 * platform_device_put - destroy a platform device
170 * @pdev: platform device to free
171 *
172 * Free all memory associated with a platform device. This function must
173 * _only_ be externally called in error cases. All other usage is a bug.
174 */
175void platform_device_put(struct platform_device *pdev)
176{
177 if (pdev)
178 put_device(&pdev->dev);
179}
180EXPORT_SYMBOL_GPL(platform_device_put);
181
182static void platform_device_release(struct device *dev)
183{
184 struct platform_object *pa = container_of(dev, struct platform_object,
185 pdev.dev);
186
187 of_device_node_put(&pa->pdev.dev);
188 kfree(pa->pdev.dev.platform_data);
189 kfree(pa->pdev.mfd_cell);
190 kfree(pa->pdev.resource);
191 kfree(pa);
192}
193
194/**
195 * platform_device_alloc - create a platform device
196 * @name: base name of the device we're adding
197 * @id: instance id
198 *
199 * Create a platform device object which can have other objects attached
200 * to it, and which will have attached objects freed when it is released.
201 */
202struct platform_device *platform_device_alloc(const char *name, int id)
203{
204 struct platform_object *pa;
205
206 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
207 if (pa) {
208 strcpy(pa->name, name);
209 pa->pdev.name = pa->name;
210 pa->pdev.id = id;
211 device_initialize(&pa->pdev.dev);
212 pa->pdev.dev.release = platform_device_release;
213 arch_setup_pdev_archdata(&pa->pdev);
214 }
215
216 return pa ? &pa->pdev : NULL;
217}
218EXPORT_SYMBOL_GPL(platform_device_alloc);
219
220/**
221 * platform_device_add_resources - add resources to a platform device
222 * @pdev: platform device allocated by platform_device_alloc to add resources to
223 * @res: set of resources that needs to be allocated for the device
224 * @num: number of resources
225 *
226 * Add a copy of the resources to the platform device. The memory
227 * associated with the resources will be freed when the platform device is
228 * released.
229 */
230int platform_device_add_resources(struct platform_device *pdev,
231 const struct resource *res, unsigned int num)
232{
233 struct resource *r = NULL;
234
235 if (res) {
236 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
237 if (!r)
238 return -ENOMEM;
239 }
240
241 kfree(pdev->resource);
242 pdev->resource = r;
243 pdev->num_resources = num;
244 return 0;
245}
246EXPORT_SYMBOL_GPL(platform_device_add_resources);
247
248/**
249 * platform_device_add_data - add platform-specific data to a platform device
250 * @pdev: platform device allocated by platform_device_alloc to add resources to
251 * @data: platform specific data for this platform device
252 * @size: size of platform specific data
253 *
254 * Add a copy of platform specific data to the platform device's
255 * platform_data pointer. The memory associated with the platform data
256 * will be freed when the platform device is released.
257 */
258int platform_device_add_data(struct platform_device *pdev, const void *data,
259 size_t size)
260{
261 void *d = NULL;
262
263 if (data) {
264 d = kmemdup(data, size, GFP_KERNEL);
265 if (!d)
266 return -ENOMEM;
267 }
268
269 kfree(pdev->dev.platform_data);
270 pdev->dev.platform_data = d;
271 return 0;
272}
273EXPORT_SYMBOL_GPL(platform_device_add_data);
274
275/**
276 * platform_device_add - add a platform device to device hierarchy
277 * @pdev: platform device we're adding
278 *
279 * This is part 2 of platform_device_register(), though may be called
280 * separately _iff_ pdev was allocated by platform_device_alloc().
281 */
282int platform_device_add(struct platform_device *pdev)
283{
284 int i, ret;
285
286 if (!pdev)
287 return -EINVAL;
288
289 if (!pdev->dev.parent)
290 pdev->dev.parent = &platform_bus;
291
292 pdev->dev.bus = &platform_bus_type;
293
294 switch (pdev->id) {
295 default:
296 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
297 break;
298 case PLATFORM_DEVID_NONE:
299 dev_set_name(&pdev->dev, "%s", pdev->name);
300 break;
301 case PLATFORM_DEVID_AUTO:
302 /*
303 * Automatically allocated device ID. We mark it as such so
304 * that we remember it must be freed, and we append a suffix
305 * to avoid namespace collision with explicit IDs.
306 */
307 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
308 if (ret < 0)
309 goto err_out;
310 pdev->id = ret;
311 pdev->id_auto = true;
312 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
313 break;
314 }
315
316 for (i = 0; i < pdev->num_resources; i++) {
317 struct resource *p, *r = &pdev->resource[i];
318
319 if (r->name == NULL)
320 r->name = dev_name(&pdev->dev);
321
322 p = r->parent;
323 if (!p) {
324 if (resource_type(r) == IORESOURCE_MEM)
325 p = &iomem_resource;
326 else if (resource_type(r) == IORESOURCE_IO)
327 p = &ioport_resource;
328 }
329
330 if (p && insert_resource(p, r)) {
331 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
332 ret = -EBUSY;
333 goto failed;
334 }
335 }
336
337 pr_debug("Registering platform device '%s'. Parent at %s\n",
338 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
339
340 ret = device_add(&pdev->dev);
341 if (ret == 0)
342 return ret;
343
344 failed:
345 if (pdev->id_auto) {
346 ida_simple_remove(&platform_devid_ida, pdev->id);
347 pdev->id = PLATFORM_DEVID_AUTO;
348 }
349
350 while (--i >= 0) {
351 struct resource *r = &pdev->resource[i];
352 unsigned long type = resource_type(r);
353
354 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
355 release_resource(r);
356 }
357
358 err_out:
359 return ret;
360}
361EXPORT_SYMBOL_GPL(platform_device_add);
362
363/**
364 * platform_device_del - remove a platform-level device
365 * @pdev: platform device we're removing
366 *
367 * Note that this function will also release all memory- and port-based
368 * resources owned by the device (@dev->resource). This function must
369 * _only_ be externally called in error cases. All other usage is a bug.
370 */
371void platform_device_del(struct platform_device *pdev)
372{
373 int i;
374
375 if (pdev) {
376 device_del(&pdev->dev);
377
378 if (pdev->id_auto) {
379 ida_simple_remove(&platform_devid_ida, pdev->id);
380 pdev->id = PLATFORM_DEVID_AUTO;
381 }
382
383 for (i = 0; i < pdev->num_resources; i++) {
384 struct resource *r = &pdev->resource[i];
385 unsigned long type = resource_type(r);
386
387 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
388 release_resource(r);
389 }
390 }
391}
392EXPORT_SYMBOL_GPL(platform_device_del);
393
394/**
395 * platform_device_register - add a platform-level device
396 * @pdev: platform device we're adding
397 */
398int platform_device_register(struct platform_device *pdev)
399{
400 device_initialize(&pdev->dev);
401 arch_setup_pdev_archdata(pdev);
402 return platform_device_add(pdev);
403}
404EXPORT_SYMBOL_GPL(platform_device_register);
405
406/**
407 * platform_device_unregister - unregister a platform-level device
408 * @pdev: platform device we're unregistering
409 *
410 * Unregistration is done in 2 steps. First we release all resources
411 * and remove it from the subsystem, then we drop reference count by
412 * calling platform_device_put().
413 */
414void platform_device_unregister(struct platform_device *pdev)
415{
416 platform_device_del(pdev);
417 platform_device_put(pdev);
418}
419EXPORT_SYMBOL_GPL(platform_device_unregister);
420
421/**
422 * platform_device_register_full - add a platform-level device with
423 * resources and platform-specific data
424 *
425 * @pdevinfo: data used to create device
426 *
427 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
428 */
429struct platform_device *platform_device_register_full(
430 const struct platform_device_info *pdevinfo)
431{
432 int ret = -ENOMEM;
433 struct platform_device *pdev;
434
435 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
436 if (!pdev)
437 goto err_alloc;
438
439 pdev->dev.parent = pdevinfo->parent;
440 ACPI_COMPANION_SET(&pdev->dev, pdevinfo->acpi_node.companion);
441
442 if (pdevinfo->dma_mask) {
443 /*
444 * This memory isn't freed when the device is put,
445 * I don't have a nice idea for that though. Conceptually
446 * dma_mask in struct device should not be a pointer.
447 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
448 */
449 pdev->dev.dma_mask =
450 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
451 if (!pdev->dev.dma_mask)
452 goto err;
453
454 *pdev->dev.dma_mask = pdevinfo->dma_mask;
455 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
456 }
457
458 ret = platform_device_add_resources(pdev,
459 pdevinfo->res, pdevinfo->num_res);
460 if (ret)
461 goto err;
462
463 ret = platform_device_add_data(pdev,
464 pdevinfo->data, pdevinfo->size_data);
465 if (ret)
466 goto err;
467
468 ret = platform_device_add(pdev);
469 if (ret) {
470err:
471 ACPI_COMPANION_SET(&pdev->dev, NULL);
472 kfree(pdev->dev.dma_mask);
473
474err_alloc:
475 platform_device_put(pdev);
476 return ERR_PTR(ret);
477 }
478
479 return pdev;
480}
481EXPORT_SYMBOL_GPL(platform_device_register_full);
482
483static int platform_drv_probe(struct device *_dev)
484{
485 struct platform_driver *drv = to_platform_driver(_dev->driver);
486 struct platform_device *dev = to_platform_device(_dev);
487 int ret;
488
489 acpi_dev_pm_attach(_dev, true);
490
491 ret = drv->probe(dev);
492 if (ret)
493 acpi_dev_pm_detach(_dev, true);
494
495 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
496 dev_warn(_dev, "probe deferral not supported\n");
497 ret = -ENXIO;
498 }
499
500 return ret;
501}
502
503static int platform_drv_probe_fail(struct device *_dev)
504{
505 return -ENXIO;
506}
507
508static int platform_drv_remove(struct device *_dev)
509{
510 struct platform_driver *drv = to_platform_driver(_dev->driver);
511 struct platform_device *dev = to_platform_device(_dev);
512 int ret;
513
514 ret = drv->remove(dev);
515 acpi_dev_pm_detach(_dev, true);
516
517 return ret;
518}
519
520static void platform_drv_shutdown(struct device *_dev)
521{
522 struct platform_driver *drv = to_platform_driver(_dev->driver);
523 struct platform_device *dev = to_platform_device(_dev);
524
525 drv->shutdown(dev);
526 acpi_dev_pm_detach(_dev, true);
527}
528
529/**
530 * __platform_driver_register - register a driver for platform-level devices
531 * @drv: platform driver structure
532 * @owner: owning module/driver
533 */
534int __platform_driver_register(struct platform_driver *drv,
535 struct module *owner)
536{
537 drv->driver.owner = owner;
538 drv->driver.bus = &platform_bus_type;
539 if (drv->probe)
540 drv->driver.probe = platform_drv_probe;
541 if (drv->remove)
542 drv->driver.remove = platform_drv_remove;
543 if (drv->shutdown)
544 drv->driver.shutdown = platform_drv_shutdown;
545
546 return driver_register(&drv->driver);
547}
548EXPORT_SYMBOL_GPL(__platform_driver_register);
549
550/**
551 * platform_driver_unregister - unregister a driver for platform-level devices
552 * @drv: platform driver structure
553 */
554void platform_driver_unregister(struct platform_driver *drv)
555{
556 driver_unregister(&drv->driver);
557}
558EXPORT_SYMBOL_GPL(platform_driver_unregister);
559
560/**
561 * platform_driver_probe - register driver for non-hotpluggable device
562 * @drv: platform driver structure
563 * @probe: the driver probe routine, probably from an __init section
564 *
565 * Use this instead of platform_driver_register() when you know the device
566 * is not hotpluggable and has already been registered, and you want to
567 * remove its run-once probe() infrastructure from memory after the driver
568 * has bound to the device.
569 *
570 * One typical use for this would be with drivers for controllers integrated
571 * into system-on-chip processors, where the controller devices have been
572 * configured as part of board setup.
573 *
574 * Note that this is incompatible with deferred probing.
575 *
576 * Returns zero if the driver registered and bound to a device, else returns
577 * a negative error code and with the driver not registered.
578 */
579int __init_or_module platform_driver_probe(struct platform_driver *drv,
580 int (*probe)(struct platform_device *))
581{
582 int retval, code;
583
584 /*
585 * Prevent driver from requesting probe deferral to avoid further
586 * futile probe attempts.
587 */
588 drv->prevent_deferred_probe = true;
589
590 /* make sure driver won't have bind/unbind attributes */
591 drv->driver.suppress_bind_attrs = true;
592
593 /* temporary section violation during probe() */
594 drv->probe = probe;
595 retval = code = platform_driver_register(drv);
596
597 /*
598 * Fixup that section violation, being paranoid about code scanning
599 * the list of drivers in order to probe new devices. Check to see
600 * if the probe was successful, and make sure any forced probes of
601 * new devices fail.
602 */
603 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
604 drv->probe = NULL;
605 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
606 retval = -ENODEV;
607 drv->driver.probe = platform_drv_probe_fail;
608 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
609
610 if (code != retval)
611 platform_driver_unregister(drv);
612 return retval;
613}
614EXPORT_SYMBOL_GPL(platform_driver_probe);
615
616/**
617 * platform_create_bundle - register driver and create corresponding device
618 * @driver: platform driver structure
619 * @probe: the driver probe routine, probably from an __init section
620 * @res: set of resources that needs to be allocated for the device
621 * @n_res: number of resources
622 * @data: platform specific data for this platform device
623 * @size: size of platform specific data
624 *
625 * Use this in legacy-style modules that probe hardware directly and
626 * register a single platform device and corresponding platform driver.
627 *
628 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
629 */
630struct platform_device * __init_or_module platform_create_bundle(
631 struct platform_driver *driver,
632 int (*probe)(struct platform_device *),
633 struct resource *res, unsigned int n_res,
634 const void *data, size_t size)
635{
636 struct platform_device *pdev;
637 int error;
638
639 pdev = platform_device_alloc(driver->driver.name, -1);
640 if (!pdev) {
641 error = -ENOMEM;
642 goto err_out;
643 }
644
645 error = platform_device_add_resources(pdev, res, n_res);
646 if (error)
647 goto err_pdev_put;
648
649 error = platform_device_add_data(pdev, data, size);
650 if (error)
651 goto err_pdev_put;
652
653 error = platform_device_add(pdev);
654 if (error)
655 goto err_pdev_put;
656
657 error = platform_driver_probe(driver, probe);
658 if (error)
659 goto err_pdev_del;
660
661 return pdev;
662
663err_pdev_del:
664 platform_device_del(pdev);
665err_pdev_put:
666 platform_device_put(pdev);
667err_out:
668 return ERR_PTR(error);
669}
670EXPORT_SYMBOL_GPL(platform_create_bundle);
671
672/* modalias support enables more hands-off userspace setup:
673 * (a) environment variable lets new-style hotplug events work once system is
674 * fully running: "modprobe $MODALIAS"
675 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
676 * mishandled before system is fully running: "modprobe $(cat modalias)"
677 */
678static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
679 char *buf)
680{
681 struct platform_device *pdev = to_platform_device(dev);
682 int len;
683
684 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
685 if (len != -ENODEV)
686 return len;
687
688 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
689 if (len != -ENODEV)
690 return len;
691
692 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
693
694 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
695}
696static DEVICE_ATTR_RO(modalias);
697
698static struct attribute *platform_dev_attrs[] = {
699 &dev_attr_modalias.attr,
700 NULL,
701};
702ATTRIBUTE_GROUPS(platform_dev);
703
704static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
705{
706 struct platform_device *pdev = to_platform_device(dev);
707 int rc;
708
709 /* Some devices have extra OF data and an OF-style MODALIAS */
710 rc = of_device_uevent_modalias(dev, env);
711 if (rc != -ENODEV)
712 return rc;
713
714 rc = acpi_device_uevent_modalias(dev, env);
715 if (rc != -ENODEV)
716 return rc;
717
718 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
719 pdev->name);
720 return 0;
721}
722
723static const struct platform_device_id *platform_match_id(
724 const struct platform_device_id *id,
725 struct platform_device *pdev)
726{
727 while (id->name[0]) {
728 if (strcmp(pdev->name, id->name) == 0) {
729 pdev->id_entry = id;
730 return id;
731 }
732 id++;
733 }
734 return NULL;
735}
736
737/**
738 * platform_match - bind platform device to platform driver.
739 * @dev: device.
740 * @drv: driver.
741 *
742 * Platform device IDs are assumed to be encoded like this:
743 * "<name><instance>", where <name> is a short description of the type of
744 * device, like "pci" or "floppy", and <instance> is the enumerated
745 * instance of the device, like '0' or '42'. Driver IDs are simply
746 * "<name>". So, extract the <name> from the platform_device structure,
747 * and compare it against the name of the driver. Return whether they match
748 * or not.
749 */
750static int platform_match(struct device *dev, struct device_driver *drv)
751{
752 struct platform_device *pdev = to_platform_device(dev);
753 struct platform_driver *pdrv = to_platform_driver(drv);
754
755 /* Attempt an OF style match first */
756 if (of_driver_match_device(dev, drv))
757 return 1;
758
759 /* Then try ACPI style match */
760 if (acpi_driver_match_device(dev, drv))
761 return 1;
762
763 /* Then try to match against the id table */
764 if (pdrv->id_table)
765 return platform_match_id(pdrv->id_table, pdev) != NULL;
766
767 /* fall-back to driver name match */
768 return (strcmp(pdev->name, drv->name) == 0);
769}
770
771#ifdef CONFIG_PM_SLEEP
772
773static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
774{
775 struct platform_driver *pdrv = to_platform_driver(dev->driver);
776 struct platform_device *pdev = to_platform_device(dev);
777 int ret = 0;
778
779 if (dev->driver && pdrv->suspend)
780 ret = pdrv->suspend(pdev, mesg);
781
782 return ret;
783}
784
785static int platform_legacy_resume(struct device *dev)
786{
787 struct platform_driver *pdrv = to_platform_driver(dev->driver);
788 struct platform_device *pdev = to_platform_device(dev);
789 int ret = 0;
790
791 if (dev->driver && pdrv->resume)
792 ret = pdrv->resume(pdev);
793
794 return ret;
795}
796
797#endif /* CONFIG_PM_SLEEP */
798
799#ifdef CONFIG_SUSPEND
800
801int platform_pm_suspend(struct device *dev)
802{
803 struct device_driver *drv = dev->driver;
804 int ret = 0;
805
806 if (!drv)
807 return 0;
808
809 if (drv->pm) {
810 if (drv->pm->suspend)
811 ret = drv->pm->suspend(dev);
812 } else {
813 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
814 }
815
816 return ret;
817}
818
819int platform_pm_resume(struct device *dev)
820{
821 struct device_driver *drv = dev->driver;
822 int ret = 0;
823
824 if (!drv)
825 return 0;
826
827 if (drv->pm) {
828 if (drv->pm->resume)
829 ret = drv->pm->resume(dev);
830 } else {
831 ret = platform_legacy_resume(dev);
832 }
833
834 return ret;
835}
836
837#endif /* CONFIG_SUSPEND */
838
839#ifdef CONFIG_HIBERNATE_CALLBACKS
840
841int platform_pm_freeze(struct device *dev)
842{
843 struct device_driver *drv = dev->driver;
844 int ret = 0;
845
846 if (!drv)
847 return 0;
848
849 if (drv->pm) {
850 if (drv->pm->freeze)
851 ret = drv->pm->freeze(dev);
852 } else {
853 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
854 }
855
856 return ret;
857}
858
859int platform_pm_thaw(struct device *dev)
860{
861 struct device_driver *drv = dev->driver;
862 int ret = 0;
863
864 if (!drv)
865 return 0;
866
867 if (drv->pm) {
868 if (drv->pm->thaw)
869 ret = drv->pm->thaw(dev);
870 } else {
871 ret = platform_legacy_resume(dev);
872 }
873
874 return ret;
875}
876
877int platform_pm_poweroff(struct device *dev)
878{
879 struct device_driver *drv = dev->driver;
880 int ret = 0;
881
882 if (!drv)
883 return 0;
884
885 if (drv->pm) {
886 if (drv->pm->poweroff)
887 ret = drv->pm->poweroff(dev);
888 } else {
889 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
890 }
891
892 return ret;
893}
894
895int platform_pm_restore(struct device *dev)
896{
897 struct device_driver *drv = dev->driver;
898 int ret = 0;
899
900 if (!drv)
901 return 0;
902
903 if (drv->pm) {
904 if (drv->pm->restore)
905 ret = drv->pm->restore(dev);
906 } else {
907 ret = platform_legacy_resume(dev);
908 }
909
910 return ret;
911}
912
913#endif /* CONFIG_HIBERNATE_CALLBACKS */
914
915static const struct dev_pm_ops platform_dev_pm_ops = {
916 .runtime_suspend = pm_generic_runtime_suspend,
917 .runtime_resume = pm_generic_runtime_resume,
918 USE_PLATFORM_PM_SLEEP_OPS
919};
920
921struct bus_type platform_bus_type = {
922 .name = "platform",
923 .dev_groups = platform_dev_groups,
924 .match = platform_match,
925 .uevent = platform_uevent,
926 .pm = &platform_dev_pm_ops,
927};
928EXPORT_SYMBOL_GPL(platform_bus_type);
929
930int __init platform_bus_init(void)
931{
932 int error;
933
934 early_platform_cleanup();
935
936 error = device_register(&platform_bus);
937 if (error)
938 return error;
939 error = bus_register(&platform_bus_type);
940 if (error)
941 device_unregister(&platform_bus);
942 return error;
943}
944
945#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
946u64 dma_get_required_mask(struct device *dev)
947{
948 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
949 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
950 u64 mask;
951
952 if (!high_totalram) {
953 /* convert to mask just covering totalram */
954 low_totalram = (1 << (fls(low_totalram) - 1));
955 low_totalram += low_totalram - 1;
956 mask = low_totalram;
957 } else {
958 high_totalram = (1 << (fls(high_totalram) - 1));
959 high_totalram += high_totalram - 1;
960 mask = (((u64)high_totalram) << 32) + 0xffffffff;
961 }
962 return mask;
963}
964EXPORT_SYMBOL_GPL(dma_get_required_mask);
965#endif
966
967static __initdata LIST_HEAD(early_platform_driver_list);
968static __initdata LIST_HEAD(early_platform_device_list);
969
970/**
971 * early_platform_driver_register - register early platform driver
972 * @epdrv: early_platform driver structure
973 * @buf: string passed from early_param()
974 *
975 * Helper function for early_platform_init() / early_platform_init_buffer()
976 */
977int __init early_platform_driver_register(struct early_platform_driver *epdrv,
978 char *buf)
979{
980 char *tmp;
981 int n;
982
983 /* Simply add the driver to the end of the global list.
984 * Drivers will by default be put on the list in compiled-in order.
985 */
986 if (!epdrv->list.next) {
987 INIT_LIST_HEAD(&epdrv->list);
988 list_add_tail(&epdrv->list, &early_platform_driver_list);
989 }
990
991 /* If the user has specified device then make sure the driver
992 * gets prioritized. The driver of the last device specified on
993 * command line will be put first on the list.
994 */
995 n = strlen(epdrv->pdrv->driver.name);
996 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
997 list_move(&epdrv->list, &early_platform_driver_list);
998
999 /* Allow passing parameters after device name */
1000 if (buf[n] == '\0' || buf[n] == ',')
1001 epdrv->requested_id = -1;
1002 else {
1003 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1004 &tmp, 10);
1005
1006 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1007 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1008 n = 0;
1009 } else
1010 n += strcspn(&buf[n + 1], ",") + 1;
1011 }
1012
1013 if (buf[n] == ',')
1014 n++;
1015
1016 if (epdrv->bufsize) {
1017 memcpy(epdrv->buffer, &buf[n],
1018 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1019 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1020 }
1021 }
1022
1023 return 0;
1024}
1025
1026/**
1027 * early_platform_add_devices - adds a number of early platform devices
1028 * @devs: array of early platform devices to add
1029 * @num: number of early platform devices in array
1030 *
1031 * Used by early architecture code to register early platform devices and
1032 * their platform data.
1033 */
1034void __init early_platform_add_devices(struct platform_device **devs, int num)
1035{
1036 struct device *dev;
1037 int i;
1038
1039 /* simply add the devices to list */
1040 for (i = 0; i < num; i++) {
1041 dev = &devs[i]->dev;
1042
1043 if (!dev->devres_head.next) {
1044 pm_runtime_early_init(dev);
1045 INIT_LIST_HEAD(&dev->devres_head);
1046 list_add_tail(&dev->devres_head,
1047 &early_platform_device_list);
1048 }
1049 }
1050}
1051
1052/**
1053 * early_platform_driver_register_all - register early platform drivers
1054 * @class_str: string to identify early platform driver class
1055 *
1056 * Used by architecture code to register all early platform drivers
1057 * for a certain class. If omitted then only early platform drivers
1058 * with matching kernel command line class parameters will be registered.
1059 */
1060void __init early_platform_driver_register_all(char *class_str)
1061{
1062 /* The "class_str" parameter may or may not be present on the kernel
1063 * command line. If it is present then there may be more than one
1064 * matching parameter.
1065 *
1066 * Since we register our early platform drivers using early_param()
1067 * we need to make sure that they also get registered in the case
1068 * when the parameter is missing from the kernel command line.
1069 *
1070 * We use parse_early_options() to make sure the early_param() gets
1071 * called at least once. The early_param() may be called more than
1072 * once since the name of the preferred device may be specified on
1073 * the kernel command line. early_platform_driver_register() handles
1074 * this case for us.
1075 */
1076 parse_early_options(class_str);
1077}
1078
1079/**
1080 * early_platform_match - find early platform device matching driver
1081 * @epdrv: early platform driver structure
1082 * @id: id to match against
1083 */
1084static struct platform_device * __init
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 * early_platform_left - check if early platform driver has matching devices
1099 * @epdrv: early platform driver structure
1100 * @id: return true if id or above exists
1101 */
1102static int __init 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 * early_platform_driver_probe_id - probe drivers matching class_str and id
1117 * @class_str: string to identify early platform driver class
1118 * @id: id to match against
1119 * @nr_probe: number of platform devices to successfully probe before exiting
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 /* only use drivers matching our class_str */
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 /* skip requested id */
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_warn("%s: unable to parse %s parameter\n",
1158 class_str, epdrv->pdrv->driver.name);
1159 /* fall-through */
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 /*
1169 * Set up a sensible init_name to enable
1170 * dev_name() and others to be used before the
1171 * rest of the driver core is initialized.
1172 */
1173 if (!match->dev.init_name && slab_is_available()) {
1174 if (match->id != -1)
1175 match->dev.init_name =
1176 kasprintf(GFP_KERNEL, "%s.%d",
1177 match->name,
1178 match->id);
1179 else
1180 match->dev.init_name =
1181 kasprintf(GFP_KERNEL, "%s",
1182 match->name);
1183
1184 if (!match->dev.init_name)
1185 return -ENOMEM;
1186 }
1187
1188 if (epdrv->pdrv->probe(match))
1189 pr_warn("%s: unable to probe %s early.\n",
1190 class_str, match->name);
1191 else
1192 n++;
1193 }
1194
1195 if (n >= nr_probe)
1196 break;
1197 }
1198
1199 if (left)
1200 return n;
1201 else
1202 return -ENODEV;
1203}
1204
1205/**
1206 * early_platform_driver_probe - probe a class of registered drivers
1207 * @class_str: string to identify early platform driver class
1208 * @nr_probe: number of platform devices to successfully probe before exiting
1209 * @user_only: only probe user specified early platform devices
1210 *
1211 * Used by architecture code to probe registered early platform drivers
1212 * within a certain class. For probe to happen a registered early platform
1213 * device matching a registered early platform driver is needed.
1214 */
1215int __init early_platform_driver_probe(char *class_str,
1216 int nr_probe,
1217 int user_only)
1218{
1219 int k, n, i;
1220
1221 n = 0;
1222 for (i = -2; n < nr_probe; i++) {
1223 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1224
1225 if (k < 0)
1226 break;
1227
1228 n += k;
1229
1230 if (user_only)
1231 break;
1232 }
1233
1234 return n;
1235}
1236
1237/**
1238 * early_platform_cleanup - clean up early platform code
1239 */
1240void __init early_platform_cleanup(void)
1241{
1242 struct platform_device *pd, *pd2;
1243
1244 /* clean up the devres list used to chain devices */
1245 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1246 dev.devres_head) {
1247 list_del(&pd->dev.devres_head);
1248 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1249 }
1250}
1251