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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/pm_domain.h>
25#include <linux/idr.h>
26#include <linux/acpi.h>
27#include <linux/clk/clk-conf.h>
28#include <linux/limits.h>
29#include <linux/property.h>
30
31#include "base.h"
32#include "power/power.h"
33
34/* For automatically allocated device IDs */
35static DEFINE_IDA(platform_devid_ida);
36
37struct device platform_bus = {
38 .init_name = "platform",
39};
40EXPORT_SYMBOL_GPL(platform_bus);
41
42/**
43 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
44 * @pdev: platform device
45 *
46 * This is called before platform_device_add() such that any pdev_archdata may
47 * be setup before the platform_notifier is called. So if a user needs to
48 * manipulate any relevant information in the pdev_archdata they can do:
49 *
50 * platform_device_alloc()
51 * ... manipulate ...
52 * platform_device_add()
53 *
54 * And if they don't care they can just call platform_device_register() and
55 * everything will just work out.
56 */
57void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
58{
59}
60
61/**
62 * platform_get_resource - get a resource for a device
63 * @dev: platform device
64 * @type: resource type
65 * @num: resource index
66 */
67struct resource *platform_get_resource(struct platform_device *dev,
68 unsigned int type, unsigned int num)
69{
70 int i;
71
72 for (i = 0; i < dev->num_resources; i++) {
73 struct resource *r = &dev->resource[i];
74
75 if (type == resource_type(r) && num-- == 0)
76 return r;
77 }
78 return NULL;
79}
80EXPORT_SYMBOL_GPL(platform_get_resource);
81
82/**
83 * platform_get_irq - get an IRQ for a device
84 * @dev: platform device
85 * @num: IRQ number index
86 */
87int platform_get_irq(struct platform_device *dev, unsigned int num)
88{
89#ifdef CONFIG_SPARC
90 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
91 if (!dev || num >= dev->archdata.num_irqs)
92 return -ENXIO;
93 return dev->archdata.irqs[num];
94#else
95 struct resource *r;
96 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
97 int ret;
98
99 ret = of_irq_get(dev->dev.of_node, num);
100 if (ret > 0 || ret == -EPROBE_DEFER)
101 return ret;
102 }
103
104 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
105 /*
106 * The resources may pass trigger flags to the irqs that need
107 * to be set up. It so happens that the trigger flags for
108 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
109 * settings.
110 */
111 if (r && r->flags & IORESOURCE_BITS) {
112 struct irq_data *irqd;
113
114 irqd = irq_get_irq_data(r->start);
115 if (!irqd)
116 return -ENXIO;
117 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
118 }
119
120 return r ? r->start : -ENXIO;
121#endif
122}
123EXPORT_SYMBOL_GPL(platform_get_irq);
124
125/**
126 * platform_irq_count - Count the number of IRQs a platform device uses
127 * @dev: platform device
128 *
129 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
130 */
131int platform_irq_count(struct platform_device *dev)
132{
133 int ret, nr = 0;
134
135 while ((ret = platform_get_irq(dev, nr)) >= 0)
136 nr++;
137
138 if (ret == -EPROBE_DEFER)
139 return ret;
140
141 return nr;
142}
143EXPORT_SYMBOL_GPL(platform_irq_count);
144
145/**
146 * platform_get_resource_byname - get a resource for a device by name
147 * @dev: platform device
148 * @type: resource type
149 * @name: resource name
150 */
151struct resource *platform_get_resource_byname(struct platform_device *dev,
152 unsigned int type,
153 const char *name)
154{
155 int i;
156
157 for (i = 0; i < dev->num_resources; i++) {
158 struct resource *r = &dev->resource[i];
159
160 if (unlikely(!r->name))
161 continue;
162
163 if (type == resource_type(r) && !strcmp(r->name, name))
164 return r;
165 }
166 return NULL;
167}
168EXPORT_SYMBOL_GPL(platform_get_resource_byname);
169
170/**
171 * platform_get_irq_byname - get an IRQ for a device by name
172 * @dev: platform device
173 * @name: IRQ name
174 */
175int platform_get_irq_byname(struct platform_device *dev, const char *name)
176{
177 struct resource *r;
178
179 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
180 int ret;
181
182 ret = of_irq_get_byname(dev->dev.of_node, name);
183 if (ret > 0 || ret == -EPROBE_DEFER)
184 return ret;
185 }
186
187 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
188 return r ? r->start : -ENXIO;
189}
190EXPORT_SYMBOL_GPL(platform_get_irq_byname);
191
192/**
193 * platform_add_devices - add a numbers of platform devices
194 * @devs: array of platform devices to add
195 * @num: number of platform devices in array
196 */
197int platform_add_devices(struct platform_device **devs, int num)
198{
199 int i, ret = 0;
200
201 for (i = 0; i < num; i++) {
202 ret = platform_device_register(devs[i]);
203 if (ret) {
204 while (--i >= 0)
205 platform_device_unregister(devs[i]);
206 break;
207 }
208 }
209
210 return ret;
211}
212EXPORT_SYMBOL_GPL(platform_add_devices);
213
214struct platform_object {
215 struct platform_device pdev;
216 char name[];
217};
218
219/**
220 * platform_device_put - destroy a platform device
221 * @pdev: platform device to free
222 *
223 * Free all memory associated with a platform device. This function must
224 * _only_ be externally called in error cases. All other usage is a bug.
225 */
226void platform_device_put(struct platform_device *pdev)
227{
228 if (pdev)
229 put_device(&pdev->dev);
230}
231EXPORT_SYMBOL_GPL(platform_device_put);
232
233static void platform_device_release(struct device *dev)
234{
235 struct platform_object *pa = container_of(dev, struct platform_object,
236 pdev.dev);
237
238 of_device_node_put(&pa->pdev.dev);
239 kfree(pa->pdev.dev.platform_data);
240 kfree(pa->pdev.mfd_cell);
241 kfree(pa->pdev.resource);
242 kfree(pa->pdev.driver_override);
243 kfree(pa);
244}
245
246/**
247 * platform_device_alloc - create a platform device
248 * @name: base name of the device we're adding
249 * @id: instance id
250 *
251 * Create a platform device object which can have other objects attached
252 * to it, and which will have attached objects freed when it is released.
253 */
254struct platform_device *platform_device_alloc(const char *name, int id)
255{
256 struct platform_object *pa;
257
258 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
259 if (pa) {
260 strcpy(pa->name, name);
261 pa->pdev.name = pa->name;
262 pa->pdev.id = id;
263 device_initialize(&pa->pdev.dev);
264 pa->pdev.dev.release = platform_device_release;
265 arch_setup_pdev_archdata(&pa->pdev);
266 }
267
268 return pa ? &pa->pdev : NULL;
269}
270EXPORT_SYMBOL_GPL(platform_device_alloc);
271
272/**
273 * platform_device_add_resources - add resources to a platform device
274 * @pdev: platform device allocated by platform_device_alloc to add resources to
275 * @res: set of resources that needs to be allocated for the device
276 * @num: number of resources
277 *
278 * Add a copy of the resources to the platform device. The memory
279 * associated with the resources will be freed when the platform device is
280 * released.
281 */
282int platform_device_add_resources(struct platform_device *pdev,
283 const struct resource *res, unsigned int num)
284{
285 struct resource *r = NULL;
286
287 if (res) {
288 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
289 if (!r)
290 return -ENOMEM;
291 }
292
293 kfree(pdev->resource);
294 pdev->resource = r;
295 pdev->num_resources = num;
296 return 0;
297}
298EXPORT_SYMBOL_GPL(platform_device_add_resources);
299
300/**
301 * platform_device_add_data - add platform-specific data to a platform device
302 * @pdev: platform device allocated by platform_device_alloc to add resources to
303 * @data: platform specific data for this platform device
304 * @size: size of platform specific data
305 *
306 * Add a copy of platform specific data to the platform device's
307 * platform_data pointer. The memory associated with the platform data
308 * will be freed when the platform device is released.
309 */
310int platform_device_add_data(struct platform_device *pdev, const void *data,
311 size_t size)
312{
313 void *d = NULL;
314
315 if (data) {
316 d = kmemdup(data, size, GFP_KERNEL);
317 if (!d)
318 return -ENOMEM;
319 }
320
321 kfree(pdev->dev.platform_data);
322 pdev->dev.platform_data = d;
323 return 0;
324}
325EXPORT_SYMBOL_GPL(platform_device_add_data);
326
327/**
328 * platform_device_add_properties - add built-in properties to a platform device
329 * @pdev: platform device to add properties to
330 * @properties: null terminated array of properties to add
331 *
332 * The function will take deep copy of @properties and attach the copy to the
333 * platform device. The memory associated with properties will be freed when the
334 * platform device is released.
335 */
336int platform_device_add_properties(struct platform_device *pdev,
337 struct property_entry *properties)
338{
339 return device_add_properties(&pdev->dev, properties);
340}
341EXPORT_SYMBOL_GPL(platform_device_add_properties);
342
343/**
344 * platform_device_add - add a platform device to device hierarchy
345 * @pdev: platform device we're adding
346 *
347 * This is part 2 of platform_device_register(), though may be called
348 * separately _iff_ pdev was allocated by platform_device_alloc().
349 */
350int platform_device_add(struct platform_device *pdev)
351{
352 int i, ret;
353
354 if (!pdev)
355 return -EINVAL;
356
357 if (!pdev->dev.parent)
358 pdev->dev.parent = &platform_bus;
359
360 pdev->dev.bus = &platform_bus_type;
361
362 switch (pdev->id) {
363 default:
364 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
365 break;
366 case PLATFORM_DEVID_NONE:
367 dev_set_name(&pdev->dev, "%s", pdev->name);
368 break;
369 case PLATFORM_DEVID_AUTO:
370 /*
371 * Automatically allocated device ID. We mark it as such so
372 * that we remember it must be freed, and we append a suffix
373 * to avoid namespace collision with explicit IDs.
374 */
375 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
376 if (ret < 0)
377 goto err_out;
378 pdev->id = ret;
379 pdev->id_auto = true;
380 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
381 break;
382 }
383
384 for (i = 0; i < pdev->num_resources; i++) {
385 struct resource *p, *r = &pdev->resource[i];
386
387 if (r->name == NULL)
388 r->name = dev_name(&pdev->dev);
389
390 p = r->parent;
391 if (!p) {
392 if (resource_type(r) == IORESOURCE_MEM)
393 p = &iomem_resource;
394 else if (resource_type(r) == IORESOURCE_IO)
395 p = &ioport_resource;
396 }
397
398 if (p && insert_resource(p, r)) {
399 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
400 ret = -EBUSY;
401 goto failed;
402 }
403 }
404
405 pr_debug("Registering platform device '%s'. Parent at %s\n",
406 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
407
408 ret = device_add(&pdev->dev);
409 if (ret == 0)
410 return ret;
411
412 failed:
413 if (pdev->id_auto) {
414 ida_simple_remove(&platform_devid_ida, pdev->id);
415 pdev->id = PLATFORM_DEVID_AUTO;
416 }
417
418 while (--i >= 0) {
419 struct resource *r = &pdev->resource[i];
420 if (r->parent)
421 release_resource(r);
422 }
423
424 err_out:
425 return ret;
426}
427EXPORT_SYMBOL_GPL(platform_device_add);
428
429/**
430 * platform_device_del - remove a platform-level device
431 * @pdev: platform device we're removing
432 *
433 * Note that this function will also release all memory- and port-based
434 * resources owned by the device (@dev->resource). This function must
435 * _only_ be externally called in error cases. All other usage is a bug.
436 */
437void platform_device_del(struct platform_device *pdev)
438{
439 int i;
440
441 if (pdev) {
442 device_remove_properties(&pdev->dev);
443 device_del(&pdev->dev);
444
445 if (pdev->id_auto) {
446 ida_simple_remove(&platform_devid_ida, pdev->id);
447 pdev->id = PLATFORM_DEVID_AUTO;
448 }
449
450 for (i = 0; i < pdev->num_resources; i++) {
451 struct resource *r = &pdev->resource[i];
452 if (r->parent)
453 release_resource(r);
454 }
455 }
456}
457EXPORT_SYMBOL_GPL(platform_device_del);
458
459/**
460 * platform_device_register - add a platform-level device
461 * @pdev: platform device we're adding
462 */
463int platform_device_register(struct platform_device *pdev)
464{
465 device_initialize(&pdev->dev);
466 arch_setup_pdev_archdata(pdev);
467 return platform_device_add(pdev);
468}
469EXPORT_SYMBOL_GPL(platform_device_register);
470
471/**
472 * platform_device_unregister - unregister a platform-level device
473 * @pdev: platform device we're unregistering
474 *
475 * Unregistration is done in 2 steps. First we release all resources
476 * and remove it from the subsystem, then we drop reference count by
477 * calling platform_device_put().
478 */
479void platform_device_unregister(struct platform_device *pdev)
480{
481 platform_device_del(pdev);
482 platform_device_put(pdev);
483}
484EXPORT_SYMBOL_GPL(platform_device_unregister);
485
486/**
487 * platform_device_register_full - add a platform-level device with
488 * resources and platform-specific data
489 *
490 * @pdevinfo: data used to create device
491 *
492 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
493 */
494struct platform_device *platform_device_register_full(
495 const struct platform_device_info *pdevinfo)
496{
497 int ret = -ENOMEM;
498 struct platform_device *pdev;
499
500 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
501 if (!pdev)
502 goto err_alloc;
503
504 pdev->dev.parent = pdevinfo->parent;
505 pdev->dev.fwnode = pdevinfo->fwnode;
506
507 if (pdevinfo->dma_mask) {
508 /*
509 * This memory isn't freed when the device is put,
510 * I don't have a nice idea for that though. Conceptually
511 * dma_mask in struct device should not be a pointer.
512 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
513 */
514 pdev->dev.dma_mask =
515 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
516 if (!pdev->dev.dma_mask)
517 goto err;
518
519 *pdev->dev.dma_mask = pdevinfo->dma_mask;
520 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
521 }
522
523 ret = platform_device_add_resources(pdev,
524 pdevinfo->res, pdevinfo->num_res);
525 if (ret)
526 goto err;
527
528 ret = platform_device_add_data(pdev,
529 pdevinfo->data, pdevinfo->size_data);
530 if (ret)
531 goto err;
532
533 if (pdevinfo->properties) {
534 ret = platform_device_add_properties(pdev,
535 pdevinfo->properties);
536 if (ret)
537 goto err;
538 }
539
540 ret = platform_device_add(pdev);
541 if (ret) {
542err:
543 ACPI_COMPANION_SET(&pdev->dev, NULL);
544 kfree(pdev->dev.dma_mask);
545
546err_alloc:
547 platform_device_put(pdev);
548 return ERR_PTR(ret);
549 }
550
551 return pdev;
552}
553EXPORT_SYMBOL_GPL(platform_device_register_full);
554
555static int platform_drv_probe(struct device *_dev)
556{
557 struct platform_driver *drv = to_platform_driver(_dev->driver);
558 struct platform_device *dev = to_platform_device(_dev);
559 int ret;
560
561 ret = of_clk_set_defaults(_dev->of_node, false);
562 if (ret < 0)
563 return ret;
564
565 ret = dev_pm_domain_attach(_dev, true);
566 if (ret != -EPROBE_DEFER) {
567 if (drv->probe) {
568 ret = drv->probe(dev);
569 if (ret)
570 dev_pm_domain_detach(_dev, true);
571 } else {
572 /* don't fail if just dev_pm_domain_attach failed */
573 ret = 0;
574 }
575 }
576
577 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
578 dev_warn(_dev, "probe deferral not supported\n");
579 ret = -ENXIO;
580 }
581
582 return ret;
583}
584
585static int platform_drv_probe_fail(struct device *_dev)
586{
587 return -ENXIO;
588}
589
590static int platform_drv_remove(struct device *_dev)
591{
592 struct platform_driver *drv = to_platform_driver(_dev->driver);
593 struct platform_device *dev = to_platform_device(_dev);
594 int ret = 0;
595
596 if (drv->remove)
597 ret = drv->remove(dev);
598 dev_pm_domain_detach(_dev, true);
599
600 return ret;
601}
602
603static void platform_drv_shutdown(struct device *_dev)
604{
605 struct platform_driver *drv = to_platform_driver(_dev->driver);
606 struct platform_device *dev = to_platform_device(_dev);
607
608 if (drv->shutdown)
609 drv->shutdown(dev);
610}
611
612/**
613 * __platform_driver_register - register a driver for platform-level devices
614 * @drv: platform driver structure
615 * @owner: owning module/driver
616 */
617int __platform_driver_register(struct platform_driver *drv,
618 struct module *owner)
619{
620 drv->driver.owner = owner;
621 drv->driver.bus = &platform_bus_type;
622 drv->driver.probe = platform_drv_probe;
623 drv->driver.remove = platform_drv_remove;
624 drv->driver.shutdown = platform_drv_shutdown;
625
626 return driver_register(&drv->driver);
627}
628EXPORT_SYMBOL_GPL(__platform_driver_register);
629
630/**
631 * platform_driver_unregister - unregister a driver for platform-level devices
632 * @drv: platform driver structure
633 */
634void platform_driver_unregister(struct platform_driver *drv)
635{
636 driver_unregister(&drv->driver);
637}
638EXPORT_SYMBOL_GPL(platform_driver_unregister);
639
640/**
641 * __platform_driver_probe - register driver for non-hotpluggable device
642 * @drv: platform driver structure
643 * @probe: the driver probe routine, probably from an __init section
644 * @module: module which will be the owner of the driver
645 *
646 * Use this instead of platform_driver_register() when you know the device
647 * is not hotpluggable and has already been registered, and you want to
648 * remove its run-once probe() infrastructure from memory after the driver
649 * has bound to the device.
650 *
651 * One typical use for this would be with drivers for controllers integrated
652 * into system-on-chip processors, where the controller devices have been
653 * configured as part of board setup.
654 *
655 * Note that this is incompatible with deferred probing.
656 *
657 * Returns zero if the driver registered and bound to a device, else returns
658 * a negative error code and with the driver not registered.
659 */
660int __init_or_module __platform_driver_probe(struct platform_driver *drv,
661 int (*probe)(struct platform_device *), struct module *module)
662{
663 int retval, code;
664
665 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
666 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
667 drv->driver.name, __func__);
668 return -EINVAL;
669 }
670
671 /*
672 * We have to run our probes synchronously because we check if
673 * we find any devices to bind to and exit with error if there
674 * are any.
675 */
676 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
677
678 /*
679 * Prevent driver from requesting probe deferral to avoid further
680 * futile probe attempts.
681 */
682 drv->prevent_deferred_probe = true;
683
684 /* make sure driver won't have bind/unbind attributes */
685 drv->driver.suppress_bind_attrs = true;
686
687 /* temporary section violation during probe() */
688 drv->probe = probe;
689 retval = code = __platform_driver_register(drv, module);
690
691 /*
692 * Fixup that section violation, being paranoid about code scanning
693 * the list of drivers in order to probe new devices. Check to see
694 * if the probe was successful, and make sure any forced probes of
695 * new devices fail.
696 */
697 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
698 drv->probe = NULL;
699 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
700 retval = -ENODEV;
701 drv->driver.probe = platform_drv_probe_fail;
702 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
703
704 if (code != retval)
705 platform_driver_unregister(drv);
706 return retval;
707}
708EXPORT_SYMBOL_GPL(__platform_driver_probe);
709
710/**
711 * __platform_create_bundle - register driver and create corresponding device
712 * @driver: platform driver structure
713 * @probe: the driver probe routine, probably from an __init section
714 * @res: set of resources that needs to be allocated for the device
715 * @n_res: number of resources
716 * @data: platform specific data for this platform device
717 * @size: size of platform specific data
718 * @module: module which will be the owner of the driver
719 *
720 * Use this in legacy-style modules that probe hardware directly and
721 * register a single platform device and corresponding platform driver.
722 *
723 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
724 */
725struct platform_device * __init_or_module __platform_create_bundle(
726 struct platform_driver *driver,
727 int (*probe)(struct platform_device *),
728 struct resource *res, unsigned int n_res,
729 const void *data, size_t size, struct module *module)
730{
731 struct platform_device *pdev;
732 int error;
733
734 pdev = platform_device_alloc(driver->driver.name, -1);
735 if (!pdev) {
736 error = -ENOMEM;
737 goto err_out;
738 }
739
740 error = platform_device_add_resources(pdev, res, n_res);
741 if (error)
742 goto err_pdev_put;
743
744 error = platform_device_add_data(pdev, data, size);
745 if (error)
746 goto err_pdev_put;
747
748 error = platform_device_add(pdev);
749 if (error)
750 goto err_pdev_put;
751
752 error = __platform_driver_probe(driver, probe, module);
753 if (error)
754 goto err_pdev_del;
755
756 return pdev;
757
758err_pdev_del:
759 platform_device_del(pdev);
760err_pdev_put:
761 platform_device_put(pdev);
762err_out:
763 return ERR_PTR(error);
764}
765EXPORT_SYMBOL_GPL(__platform_create_bundle);
766
767/**
768 * __platform_register_drivers - register an array of platform drivers
769 * @drivers: an array of drivers to register
770 * @count: the number of drivers to register
771 * @owner: module owning the drivers
772 *
773 * Registers platform drivers specified by an array. On failure to register a
774 * driver, all previously registered drivers will be unregistered. Callers of
775 * this API should use platform_unregister_drivers() to unregister drivers in
776 * the reverse order.
777 *
778 * Returns: 0 on success or a negative error code on failure.
779 */
780int __platform_register_drivers(struct platform_driver * const *drivers,
781 unsigned int count, struct module *owner)
782{
783 unsigned int i;
784 int err;
785
786 for (i = 0; i < count; i++) {
787 pr_debug("registering platform driver %ps\n", drivers[i]);
788
789 err = __platform_driver_register(drivers[i], owner);
790 if (err < 0) {
791 pr_err("failed to register platform driver %ps: %d\n",
792 drivers[i], err);
793 goto error;
794 }
795 }
796
797 return 0;
798
799error:
800 while (i--) {
801 pr_debug("unregistering platform driver %ps\n", drivers[i]);
802 platform_driver_unregister(drivers[i]);
803 }
804
805 return err;
806}
807EXPORT_SYMBOL_GPL(__platform_register_drivers);
808
809/**
810 * platform_unregister_drivers - unregister an array of platform drivers
811 * @drivers: an array of drivers to unregister
812 * @count: the number of drivers to unregister
813 *
814 * Unegisters platform drivers specified by an array. This is typically used
815 * to complement an earlier call to platform_register_drivers(). Drivers are
816 * unregistered in the reverse order in which they were registered.
817 */
818void platform_unregister_drivers(struct platform_driver * const *drivers,
819 unsigned int count)
820{
821 while (count--) {
822 pr_debug("unregistering platform driver %ps\n", drivers[count]);
823 platform_driver_unregister(drivers[count]);
824 }
825}
826EXPORT_SYMBOL_GPL(platform_unregister_drivers);
827
828/* modalias support enables more hands-off userspace setup:
829 * (a) environment variable lets new-style hotplug events work once system is
830 * fully running: "modprobe $MODALIAS"
831 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
832 * mishandled before system is fully running: "modprobe $(cat modalias)"
833 */
834static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
835 char *buf)
836{
837 struct platform_device *pdev = to_platform_device(dev);
838 int len;
839
840 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
841 if (len != -ENODEV)
842 return len;
843
844 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
845 if (len != -ENODEV)
846 return len;
847
848 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
849
850 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
851}
852static DEVICE_ATTR_RO(modalias);
853
854static ssize_t driver_override_store(struct device *dev,
855 struct device_attribute *attr,
856 const char *buf, size_t count)
857{
858 struct platform_device *pdev = to_platform_device(dev);
859 char *driver_override, *old = pdev->driver_override, *cp;
860
861 if (count > PATH_MAX)
862 return -EINVAL;
863
864 driver_override = kstrndup(buf, count, GFP_KERNEL);
865 if (!driver_override)
866 return -ENOMEM;
867
868 cp = strchr(driver_override, '\n');
869 if (cp)
870 *cp = '\0';
871
872 if (strlen(driver_override)) {
873 pdev->driver_override = driver_override;
874 } else {
875 kfree(driver_override);
876 pdev->driver_override = NULL;
877 }
878
879 kfree(old);
880
881 return count;
882}
883
884static ssize_t driver_override_show(struct device *dev,
885 struct device_attribute *attr, char *buf)
886{
887 struct platform_device *pdev = to_platform_device(dev);
888
889 return sprintf(buf, "%s\n", pdev->driver_override);
890}
891static DEVICE_ATTR_RW(driver_override);
892
893
894static struct attribute *platform_dev_attrs[] = {
895 &dev_attr_modalias.attr,
896 &dev_attr_driver_override.attr,
897 NULL,
898};
899ATTRIBUTE_GROUPS(platform_dev);
900
901static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
902{
903 struct platform_device *pdev = to_platform_device(dev);
904 int rc;
905
906 /* Some devices have extra OF data and an OF-style MODALIAS */
907 rc = of_device_uevent_modalias(dev, env);
908 if (rc != -ENODEV)
909 return rc;
910
911 rc = acpi_device_uevent_modalias(dev, env);
912 if (rc != -ENODEV)
913 return rc;
914
915 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
916 pdev->name);
917 return 0;
918}
919
920static const struct platform_device_id *platform_match_id(
921 const struct platform_device_id *id,
922 struct platform_device *pdev)
923{
924 while (id->name[0]) {
925 if (strcmp(pdev->name, id->name) == 0) {
926 pdev->id_entry = id;
927 return id;
928 }
929 id++;
930 }
931 return NULL;
932}
933
934/**
935 * platform_match - bind platform device to platform driver.
936 * @dev: device.
937 * @drv: driver.
938 *
939 * Platform device IDs are assumed to be encoded like this:
940 * "<name><instance>", where <name> is a short description of the type of
941 * device, like "pci" or "floppy", and <instance> is the enumerated
942 * instance of the device, like '0' or '42'. Driver IDs are simply
943 * "<name>". So, extract the <name> from the platform_device structure,
944 * and compare it against the name of the driver. Return whether they match
945 * or not.
946 */
947static int platform_match(struct device *dev, struct device_driver *drv)
948{
949 struct platform_device *pdev = to_platform_device(dev);
950 struct platform_driver *pdrv = to_platform_driver(drv);
951
952 /* When driver_override is set, only bind to the matching driver */
953 if (pdev->driver_override)
954 return !strcmp(pdev->driver_override, drv->name);
955
956 /* Attempt an OF style match first */
957 if (of_driver_match_device(dev, drv))
958 return 1;
959
960 /* Then try ACPI style match */
961 if (acpi_driver_match_device(dev, drv))
962 return 1;
963
964 /* Then try to match against the id table */
965 if (pdrv->id_table)
966 return platform_match_id(pdrv->id_table, pdev) != NULL;
967
968 /* fall-back to driver name match */
969 return (strcmp(pdev->name, drv->name) == 0);
970}
971
972#ifdef CONFIG_PM_SLEEP
973
974static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
975{
976 struct platform_driver *pdrv = to_platform_driver(dev->driver);
977 struct platform_device *pdev = to_platform_device(dev);
978 int ret = 0;
979
980 if (dev->driver && pdrv->suspend)
981 ret = pdrv->suspend(pdev, mesg);
982
983 return ret;
984}
985
986static int platform_legacy_resume(struct device *dev)
987{
988 struct platform_driver *pdrv = to_platform_driver(dev->driver);
989 struct platform_device *pdev = to_platform_device(dev);
990 int ret = 0;
991
992 if (dev->driver && pdrv->resume)
993 ret = pdrv->resume(pdev);
994
995 return ret;
996}
997
998#endif /* CONFIG_PM_SLEEP */
999
1000#ifdef CONFIG_SUSPEND
1001
1002int platform_pm_suspend(struct device *dev)
1003{
1004 struct device_driver *drv = dev->driver;
1005 int ret = 0;
1006
1007 if (!drv)
1008 return 0;
1009
1010 if (drv->pm) {
1011 if (drv->pm->suspend)
1012 ret = drv->pm->suspend(dev);
1013 } else {
1014 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1015 }
1016
1017 return ret;
1018}
1019
1020int platform_pm_resume(struct device *dev)
1021{
1022 struct device_driver *drv = dev->driver;
1023 int ret = 0;
1024
1025 if (!drv)
1026 return 0;
1027
1028 if (drv->pm) {
1029 if (drv->pm->resume)
1030 ret = drv->pm->resume(dev);
1031 } else {
1032 ret = platform_legacy_resume(dev);
1033 }
1034
1035 return ret;
1036}
1037
1038#endif /* CONFIG_SUSPEND */
1039
1040#ifdef CONFIG_HIBERNATE_CALLBACKS
1041
1042int platform_pm_freeze(struct device *dev)
1043{
1044 struct device_driver *drv = dev->driver;
1045 int ret = 0;
1046
1047 if (!drv)
1048 return 0;
1049
1050 if (drv->pm) {
1051 if (drv->pm->freeze)
1052 ret = drv->pm->freeze(dev);
1053 } else {
1054 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1055 }
1056
1057 return ret;
1058}
1059
1060int platform_pm_thaw(struct device *dev)
1061{
1062 struct device_driver *drv = dev->driver;
1063 int ret = 0;
1064
1065 if (!drv)
1066 return 0;
1067
1068 if (drv->pm) {
1069 if (drv->pm->thaw)
1070 ret = drv->pm->thaw(dev);
1071 } else {
1072 ret = platform_legacy_resume(dev);
1073 }
1074
1075 return ret;
1076}
1077
1078int platform_pm_poweroff(struct device *dev)
1079{
1080 struct device_driver *drv = dev->driver;
1081 int ret = 0;
1082
1083 if (!drv)
1084 return 0;
1085
1086 if (drv->pm) {
1087 if (drv->pm->poweroff)
1088 ret = drv->pm->poweroff(dev);
1089 } else {
1090 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1091 }
1092
1093 return ret;
1094}
1095
1096int platform_pm_restore(struct device *dev)
1097{
1098 struct device_driver *drv = dev->driver;
1099 int ret = 0;
1100
1101 if (!drv)
1102 return 0;
1103
1104 if (drv->pm) {
1105 if (drv->pm->restore)
1106 ret = drv->pm->restore(dev);
1107 } else {
1108 ret = platform_legacy_resume(dev);
1109 }
1110
1111 return ret;
1112}
1113
1114#endif /* CONFIG_HIBERNATE_CALLBACKS */
1115
1116static const struct dev_pm_ops platform_dev_pm_ops = {
1117 .runtime_suspend = pm_generic_runtime_suspend,
1118 .runtime_resume = pm_generic_runtime_resume,
1119 USE_PLATFORM_PM_SLEEP_OPS
1120};
1121
1122struct bus_type platform_bus_type = {
1123 .name = "platform",
1124 .dev_groups = platform_dev_groups,
1125 .match = platform_match,
1126 .uevent = platform_uevent,
1127 .pm = &platform_dev_pm_ops,
1128};
1129EXPORT_SYMBOL_GPL(platform_bus_type);
1130
1131int __init platform_bus_init(void)
1132{
1133 int error;
1134
1135 early_platform_cleanup();
1136
1137 error = device_register(&platform_bus);
1138 if (error)
1139 return error;
1140 error = bus_register(&platform_bus_type);
1141 if (error)
1142 device_unregister(&platform_bus);
1143 of_platform_register_reconfig_notifier();
1144 return error;
1145}
1146
1147#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1148u64 dma_get_required_mask(struct device *dev)
1149{
1150 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1151 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1152 u64 mask;
1153
1154 if (!high_totalram) {
1155 /* convert to mask just covering totalram */
1156 low_totalram = (1 << (fls(low_totalram) - 1));
1157 low_totalram += low_totalram - 1;
1158 mask = low_totalram;
1159 } else {
1160 high_totalram = (1 << (fls(high_totalram) - 1));
1161 high_totalram += high_totalram - 1;
1162 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1163 }
1164 return mask;
1165}
1166EXPORT_SYMBOL_GPL(dma_get_required_mask);
1167#endif
1168
1169static __initdata LIST_HEAD(early_platform_driver_list);
1170static __initdata LIST_HEAD(early_platform_device_list);
1171
1172/**
1173 * early_platform_driver_register - register early platform driver
1174 * @epdrv: early_platform driver structure
1175 * @buf: string passed from early_param()
1176 *
1177 * Helper function for early_platform_init() / early_platform_init_buffer()
1178 */
1179int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1180 char *buf)
1181{
1182 char *tmp;
1183 int n;
1184
1185 /* Simply add the driver to the end of the global list.
1186 * Drivers will by default be put on the list in compiled-in order.
1187 */
1188 if (!epdrv->list.next) {
1189 INIT_LIST_HEAD(&epdrv->list);
1190 list_add_tail(&epdrv->list, &early_platform_driver_list);
1191 }
1192
1193 /* If the user has specified device then make sure the driver
1194 * gets prioritized. The driver of the last device specified on
1195 * command line will be put first on the list.
1196 */
1197 n = strlen(epdrv->pdrv->driver.name);
1198 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1199 list_move(&epdrv->list, &early_platform_driver_list);
1200
1201 /* Allow passing parameters after device name */
1202 if (buf[n] == '\0' || buf[n] == ',')
1203 epdrv->requested_id = -1;
1204 else {
1205 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1206 &tmp, 10);
1207
1208 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1209 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1210 n = 0;
1211 } else
1212 n += strcspn(&buf[n + 1], ",") + 1;
1213 }
1214
1215 if (buf[n] == ',')
1216 n++;
1217
1218 if (epdrv->bufsize) {
1219 memcpy(epdrv->buffer, &buf[n],
1220 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1221 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1222 }
1223 }
1224
1225 return 0;
1226}
1227
1228/**
1229 * early_platform_add_devices - adds a number of early platform devices
1230 * @devs: array of early platform devices to add
1231 * @num: number of early platform devices in array
1232 *
1233 * Used by early architecture code to register early platform devices and
1234 * their platform data.
1235 */
1236void __init early_platform_add_devices(struct platform_device **devs, int num)
1237{
1238 struct device *dev;
1239 int i;
1240
1241 /* simply add the devices to list */
1242 for (i = 0; i < num; i++) {
1243 dev = &devs[i]->dev;
1244
1245 if (!dev->devres_head.next) {
1246 pm_runtime_early_init(dev);
1247 INIT_LIST_HEAD(&dev->devres_head);
1248 list_add_tail(&dev->devres_head,
1249 &early_platform_device_list);
1250 }
1251 }
1252}
1253
1254/**
1255 * early_platform_driver_register_all - register early platform drivers
1256 * @class_str: string to identify early platform driver class
1257 *
1258 * Used by architecture code to register all early platform drivers
1259 * for a certain class. If omitted then only early platform drivers
1260 * with matching kernel command line class parameters will be registered.
1261 */
1262void __init early_platform_driver_register_all(char *class_str)
1263{
1264 /* The "class_str" parameter may or may not be present on the kernel
1265 * command line. If it is present then there may be more than one
1266 * matching parameter.
1267 *
1268 * Since we register our early platform drivers using early_param()
1269 * we need to make sure that they also get registered in the case
1270 * when the parameter is missing from the kernel command line.
1271 *
1272 * We use parse_early_options() to make sure the early_param() gets
1273 * called at least once. The early_param() may be called more than
1274 * once since the name of the preferred device may be specified on
1275 * the kernel command line. early_platform_driver_register() handles
1276 * this case for us.
1277 */
1278 parse_early_options(class_str);
1279}
1280
1281/**
1282 * early_platform_match - find early platform device matching driver
1283 * @epdrv: early platform driver structure
1284 * @id: id to match against
1285 */
1286static struct platform_device * __init
1287early_platform_match(struct early_platform_driver *epdrv, int id)
1288{
1289 struct platform_device *pd;
1290
1291 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1292 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1293 if (pd->id == id)
1294 return pd;
1295
1296 return NULL;
1297}
1298
1299/**
1300 * early_platform_left - check if early platform driver has matching devices
1301 * @epdrv: early platform driver structure
1302 * @id: return true if id or above exists
1303 */
1304static int __init early_platform_left(struct early_platform_driver *epdrv,
1305 int id)
1306{
1307 struct platform_device *pd;
1308
1309 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1310 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1311 if (pd->id >= id)
1312 return 1;
1313
1314 return 0;
1315}
1316
1317/**
1318 * early_platform_driver_probe_id - probe drivers matching class_str and id
1319 * @class_str: string to identify early platform driver class
1320 * @id: id to match against
1321 * @nr_probe: number of platform devices to successfully probe before exiting
1322 */
1323static int __init early_platform_driver_probe_id(char *class_str,
1324 int id,
1325 int nr_probe)
1326{
1327 struct early_platform_driver *epdrv;
1328 struct platform_device *match;
1329 int match_id;
1330 int n = 0;
1331 int left = 0;
1332
1333 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1334 /* only use drivers matching our class_str */
1335 if (strcmp(class_str, epdrv->class_str))
1336 continue;
1337
1338 if (id == -2) {
1339 match_id = epdrv->requested_id;
1340 left = 1;
1341
1342 } else {
1343 match_id = id;
1344 left += early_platform_left(epdrv, id);
1345
1346 /* skip requested id */
1347 switch (epdrv->requested_id) {
1348 case EARLY_PLATFORM_ID_ERROR:
1349 case EARLY_PLATFORM_ID_UNSET:
1350 break;
1351 default:
1352 if (epdrv->requested_id == id)
1353 match_id = EARLY_PLATFORM_ID_UNSET;
1354 }
1355 }
1356
1357 switch (match_id) {
1358 case EARLY_PLATFORM_ID_ERROR:
1359 pr_warn("%s: unable to parse %s parameter\n",
1360 class_str, epdrv->pdrv->driver.name);
1361 /* fall-through */
1362 case EARLY_PLATFORM_ID_UNSET:
1363 match = NULL;
1364 break;
1365 default:
1366 match = early_platform_match(epdrv, match_id);
1367 }
1368
1369 if (match) {
1370 /*
1371 * Set up a sensible init_name to enable
1372 * dev_name() and others to be used before the
1373 * rest of the driver core is initialized.
1374 */
1375 if (!match->dev.init_name && slab_is_available()) {
1376 if (match->id != -1)
1377 match->dev.init_name =
1378 kasprintf(GFP_KERNEL, "%s.%d",
1379 match->name,
1380 match->id);
1381 else
1382 match->dev.init_name =
1383 kasprintf(GFP_KERNEL, "%s",
1384 match->name);
1385
1386 if (!match->dev.init_name)
1387 return -ENOMEM;
1388 }
1389
1390 if (epdrv->pdrv->probe(match))
1391 pr_warn("%s: unable to probe %s early.\n",
1392 class_str, match->name);
1393 else
1394 n++;
1395 }
1396
1397 if (n >= nr_probe)
1398 break;
1399 }
1400
1401 if (left)
1402 return n;
1403 else
1404 return -ENODEV;
1405}
1406
1407/**
1408 * early_platform_driver_probe - probe a class of registered drivers
1409 * @class_str: string to identify early platform driver class
1410 * @nr_probe: number of platform devices to successfully probe before exiting
1411 * @user_only: only probe user specified early platform devices
1412 *
1413 * Used by architecture code to probe registered early platform drivers
1414 * within a certain class. For probe to happen a registered early platform
1415 * device matching a registered early platform driver is needed.
1416 */
1417int __init early_platform_driver_probe(char *class_str,
1418 int nr_probe,
1419 int user_only)
1420{
1421 int k, n, i;
1422
1423 n = 0;
1424 for (i = -2; n < nr_probe; i++) {
1425 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1426
1427 if (k < 0)
1428 break;
1429
1430 n += k;
1431
1432 if (user_only)
1433 break;
1434 }
1435
1436 return n;
1437}
1438
1439/**
1440 * early_platform_cleanup - clean up early platform code
1441 */
1442void __init early_platform_cleanup(void)
1443{
1444 struct platform_device *pd, *pd2;
1445
1446 /* clean up the devres list used to chain devices */
1447 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1448 dev.devres_head) {
1449 list_del(&pd->dev.devres_head);
1450 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1451 }
1452}
1453