Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[zen-stable.git] / drivers / base / platform.c
blob7a24895543e7c24bdc8d62d3728c9bfc7f98b3bc
1 /*
2 * platform.c - platform 'pseudo' bus for legacy devices
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
7 * This file is released under the GPLv2
9 * Please see Documentation/driver-model/platform.txt for more
10 * information.
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>
24 #include "base.h"
26 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
27 driver))
29 struct device platform_bus = {
30 .init_name = "platform",
32 EXPORT_SYMBOL_GPL(platform_bus);
34 /**
35 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
36 * @pdev: platform device
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:
42 * platform_devic_alloc()
43 * ... manipulate ...
44 * platform_device_add()
46 * And if they don't care they can just call platform_device_register() and
47 * everything will just work out.
49 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
53 /**
54 * platform_get_resource - get a resource for a device
55 * @dev: platform device
56 * @type: resource type
57 * @num: resource index
59 struct resource *platform_get_resource(struct platform_device *dev,
60 unsigned int type, unsigned int num)
62 int i;
64 for (i = 0; i < dev->num_resources; i++) {
65 struct resource *r = &dev->resource[i];
67 if (type == resource_type(r) && num-- == 0)
68 return r;
70 return NULL;
72 EXPORT_SYMBOL_GPL(platform_get_resource);
74 /**
75 * platform_get_irq - get an IRQ for a device
76 * @dev: platform device
77 * @num: IRQ number index
79 int platform_get_irq(struct platform_device *dev, unsigned int num)
81 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
83 return r ? r->start : -ENXIO;
85 EXPORT_SYMBOL_GPL(platform_get_irq);
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
93 struct resource *platform_get_resource_byname(struct platform_device *dev,
94 unsigned int type,
95 const char *name)
97 int i;
99 for (i = 0; i < dev->num_resources; i++) {
100 struct resource *r = &dev->resource[i];
102 if (type == resource_type(r) && !strcmp(r->name, name))
103 return r;
105 return NULL;
107 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
110 * platform_get_irq - get an IRQ for a device
111 * @dev: platform device
112 * @name: IRQ name
114 int platform_get_irq_byname(struct platform_device *dev, const char *name)
116 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
117 name);
119 return r ? r->start : -ENXIO;
121 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
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
128 int platform_add_devices(struct platform_device **devs, int num)
130 int i, ret = 0;
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;
141 return ret;
143 EXPORT_SYMBOL_GPL(platform_add_devices);
145 struct platform_object {
146 struct platform_device pdev;
147 char name[1];
151 * platform_device_put - destroy a platform device
152 * @pdev: platform device to free
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.
157 void platform_device_put(struct platform_device *pdev)
159 if (pdev)
160 put_device(&pdev->dev);
162 EXPORT_SYMBOL_GPL(platform_device_put);
164 static void platform_device_release(struct device *dev)
166 struct platform_object *pa = container_of(dev, struct platform_object,
167 pdev.dev);
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);
177 * platform_device_alloc - create a platform device
178 * @name: base name of the device we're adding
179 * @id: instance id
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.
184 struct platform_device *platform_device_alloc(const char *name, int id)
186 struct platform_object *pa;
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);
198 return pa ? &pa->pdev : NULL;
200 EXPORT_SYMBOL_GPL(platform_device_alloc);
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
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.
212 int platform_device_add_resources(struct platform_device *pdev,
213 const struct resource *res, unsigned int num)
215 struct resource *r = NULL;
217 if (res) {
218 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
219 if (!r)
220 return -ENOMEM;
223 kfree(pdev->resource);
224 pdev->resource = r;
225 pdev->num_resources = num;
226 return 0;
228 EXPORT_SYMBOL_GPL(platform_device_add_resources);
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
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.
240 int platform_device_add_data(struct platform_device *pdev, const void *data,
241 size_t size)
243 void *d = NULL;
245 if (data) {
246 d = kmemdup(data, size, GFP_KERNEL);
247 if (!d)
248 return -ENOMEM;
251 kfree(pdev->dev.platform_data);
252 pdev->dev.platform_data = d;
253 return 0;
255 EXPORT_SYMBOL_GPL(platform_device_add_data);
258 * platform_device_add - add a platform device to device hierarchy
259 * @pdev: platform device we're adding
261 * This is part 2 of platform_device_register(), though may be called
262 * separately _iff_ pdev was allocated by platform_device_alloc().
264 int platform_device_add(struct platform_device *pdev)
266 int i, ret = 0;
268 if (!pdev)
269 return -EINVAL;
271 if (!pdev->dev.parent)
272 pdev->dev.parent = &platform_bus;
274 pdev->dev.bus = &platform_bus_type;
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);
281 for (i = 0; i < pdev->num_resources; i++) {
282 struct resource *p, *r = &pdev->resource[i];
284 if (r->name == NULL)
285 r->name = dev_name(&pdev->dev);
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;
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;
304 pr_debug("Registering platform device '%s'. Parent at %s\n",
305 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
307 ret = device_add(&pdev->dev);
308 if (ret == 0)
309 return ret;
311 failed:
312 while (--i >= 0) {
313 struct resource *r = &pdev->resource[i];
314 unsigned long type = resource_type(r);
316 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
317 release_resource(r);
320 return ret;
322 EXPORT_SYMBOL_GPL(platform_device_add);
325 * platform_device_del - remove a platform-level device
326 * @pdev: platform device we're removing
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.
332 void platform_device_del(struct platform_device *pdev)
334 int i;
336 if (pdev) {
337 device_del(&pdev->dev);
339 for (i = 0; i < pdev->num_resources; i++) {
340 struct resource *r = &pdev->resource[i];
341 unsigned long type = resource_type(r);
343 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
344 release_resource(r);
348 EXPORT_SYMBOL_GPL(platform_device_del);
351 * platform_device_register - add a platform-level device
352 * @pdev: platform device we're adding
354 int platform_device_register(struct platform_device *pdev)
356 device_initialize(&pdev->dev);
357 arch_setup_pdev_archdata(pdev);
358 return platform_device_add(pdev);
360 EXPORT_SYMBOL_GPL(platform_device_register);
363 * platform_device_unregister - unregister a platform-level device
364 * @pdev: platform device we're unregistering
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().
370 void platform_device_unregister(struct platform_device *pdev)
372 platform_device_del(pdev);
373 platform_device_put(pdev);
375 EXPORT_SYMBOL_GPL(platform_device_unregister);
378 * platform_device_register_full - add a platform-level device with
379 * resources and platform-specific data
381 * @pdevinfo: data used to create device
383 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
385 struct platform_device *platform_device_register_full(
386 struct platform_device_info *pdevinfo)
388 int ret = -ENOMEM;
389 struct platform_device *pdev;
391 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
392 if (!pdev)
393 goto err_alloc;
395 pdev->dev.parent = pdevinfo->parent;
397 if (pdevinfo->dma_mask) {
399 * This memory isn't freed when the device is put,
400 * I don't have a nice idea for that though. Conceptually
401 * dma_mask in struct device should not be a pointer.
402 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
404 pdev->dev.dma_mask =
405 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
406 if (!pdev->dev.dma_mask)
407 goto err;
409 *pdev->dev.dma_mask = pdevinfo->dma_mask;
410 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
413 ret = platform_device_add_resources(pdev,
414 pdevinfo->res, pdevinfo->num_res);
415 if (ret)
416 goto err;
418 ret = platform_device_add_data(pdev,
419 pdevinfo->data, pdevinfo->size_data);
420 if (ret)
421 goto err;
423 ret = platform_device_add(pdev);
424 if (ret) {
425 err:
426 kfree(pdev->dev.dma_mask);
428 err_alloc:
429 platform_device_put(pdev);
430 return ERR_PTR(ret);
433 return pdev;
435 EXPORT_SYMBOL_GPL(platform_device_register_full);
437 static int platform_drv_probe(struct device *_dev)
439 struct platform_driver *drv = to_platform_driver(_dev->driver);
440 struct platform_device *dev = to_platform_device(_dev);
442 return drv->probe(dev);
445 static int platform_drv_probe_fail(struct device *_dev)
447 return -ENXIO;
450 static int platform_drv_remove(struct device *_dev)
452 struct platform_driver *drv = to_platform_driver(_dev->driver);
453 struct platform_device *dev = to_platform_device(_dev);
455 return drv->remove(dev);
458 static void platform_drv_shutdown(struct device *_dev)
460 struct platform_driver *drv = to_platform_driver(_dev->driver);
461 struct platform_device *dev = to_platform_device(_dev);
463 drv->shutdown(dev);
467 * platform_driver_register - register a driver for platform-level devices
468 * @drv: platform driver structure
470 int platform_driver_register(struct platform_driver *drv)
472 drv->driver.bus = &platform_bus_type;
473 if (drv->probe)
474 drv->driver.probe = platform_drv_probe;
475 if (drv->remove)
476 drv->driver.remove = platform_drv_remove;
477 if (drv->shutdown)
478 drv->driver.shutdown = platform_drv_shutdown;
480 return driver_register(&drv->driver);
482 EXPORT_SYMBOL_GPL(platform_driver_register);
485 * platform_driver_unregister - unregister a driver for platform-level devices
486 * @drv: platform driver structure
488 void platform_driver_unregister(struct platform_driver *drv)
490 driver_unregister(&drv->driver);
492 EXPORT_SYMBOL_GPL(platform_driver_unregister);
495 * platform_driver_probe - register driver for non-hotpluggable device
496 * @drv: platform driver structure
497 * @probe: the driver probe routine, probably from an __init section
499 * Use this instead of platform_driver_register() when you know the device
500 * is not hotpluggable and has already been registered, and you want to
501 * remove its run-once probe() infrastructure from memory after the driver
502 * has bound to the device.
504 * One typical use for this would be with drivers for controllers integrated
505 * into system-on-chip processors, where the controller devices have been
506 * configured as part of board setup.
508 * Returns zero if the driver registered and bound to a device, else returns
509 * a negative error code and with the driver not registered.
511 int __init_or_module platform_driver_probe(struct platform_driver *drv,
512 int (*probe)(struct platform_device *))
514 int retval, code;
516 /* make sure driver won't have bind/unbind attributes */
517 drv->driver.suppress_bind_attrs = true;
519 /* temporary section violation during probe() */
520 drv->probe = probe;
521 retval = code = platform_driver_register(drv);
524 * Fixup that section violation, being paranoid about code scanning
525 * the list of drivers in order to probe new devices. Check to see
526 * if the probe was successful, and make sure any forced probes of
527 * new devices fail.
529 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
530 drv->probe = NULL;
531 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
532 retval = -ENODEV;
533 drv->driver.probe = platform_drv_probe_fail;
534 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
536 if (code != retval)
537 platform_driver_unregister(drv);
538 return retval;
540 EXPORT_SYMBOL_GPL(platform_driver_probe);
543 * platform_create_bundle - register driver and create corresponding device
544 * @driver: platform driver structure
545 * @probe: the driver probe routine, probably from an __init section
546 * @res: set of resources that needs to be allocated for the device
547 * @n_res: number of resources
548 * @data: platform specific data for this platform device
549 * @size: size of platform specific data
551 * Use this in legacy-style modules that probe hardware directly and
552 * register a single platform device and corresponding platform driver.
554 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
556 struct platform_device * __init_or_module platform_create_bundle(
557 struct platform_driver *driver,
558 int (*probe)(struct platform_device *),
559 struct resource *res, unsigned int n_res,
560 const void *data, size_t size)
562 struct platform_device *pdev;
563 int error;
565 pdev = platform_device_alloc(driver->driver.name, -1);
566 if (!pdev) {
567 error = -ENOMEM;
568 goto err_out;
571 error = platform_device_add_resources(pdev, res, n_res);
572 if (error)
573 goto err_pdev_put;
575 error = platform_device_add_data(pdev, data, size);
576 if (error)
577 goto err_pdev_put;
579 error = platform_device_add(pdev);
580 if (error)
581 goto err_pdev_put;
583 error = platform_driver_probe(driver, probe);
584 if (error)
585 goto err_pdev_del;
587 return pdev;
589 err_pdev_del:
590 platform_device_del(pdev);
591 err_pdev_put:
592 platform_device_put(pdev);
593 err_out:
594 return ERR_PTR(error);
596 EXPORT_SYMBOL_GPL(platform_create_bundle);
598 /* modalias support enables more hands-off userspace setup:
599 * (a) environment variable lets new-style hotplug events work once system is
600 * fully running: "modprobe $MODALIAS"
601 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
602 * mishandled before system is fully running: "modprobe $(cat modalias)"
604 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
605 char *buf)
607 struct platform_device *pdev = to_platform_device(dev);
608 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
610 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
613 static struct device_attribute platform_dev_attrs[] = {
614 __ATTR_RO(modalias),
615 __ATTR_NULL,
618 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
620 struct platform_device *pdev = to_platform_device(dev);
621 int rc;
623 /* Some devices have extra OF data and an OF-style MODALIAS */
624 rc = of_device_uevent(dev,env);
625 if (rc != -ENODEV)
626 return rc;
628 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
629 pdev->name);
630 return 0;
633 static const struct platform_device_id *platform_match_id(
634 const struct platform_device_id *id,
635 struct platform_device *pdev)
637 while (id->name[0]) {
638 if (strcmp(pdev->name, id->name) == 0) {
639 pdev->id_entry = id;
640 return id;
642 id++;
644 return NULL;
648 * platform_match - bind platform device to platform driver.
649 * @dev: device.
650 * @drv: driver.
652 * Platform device IDs are assumed to be encoded like this:
653 * "<name><instance>", where <name> is a short description of the type of
654 * device, like "pci" or "floppy", and <instance> is the enumerated
655 * instance of the device, like '0' or '42'. Driver IDs are simply
656 * "<name>". So, extract the <name> from the platform_device structure,
657 * and compare it against the name of the driver. Return whether they match
658 * or not.
660 static int platform_match(struct device *dev, struct device_driver *drv)
662 struct platform_device *pdev = to_platform_device(dev);
663 struct platform_driver *pdrv = to_platform_driver(drv);
665 /* Attempt an OF style match first */
666 if (of_driver_match_device(dev, drv))
667 return 1;
669 /* Then try to match against the id table */
670 if (pdrv->id_table)
671 return platform_match_id(pdrv->id_table, pdev) != NULL;
673 /* fall-back to driver name match */
674 return (strcmp(pdev->name, drv->name) == 0);
677 #ifdef CONFIG_PM_SLEEP
679 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
681 struct platform_driver *pdrv = to_platform_driver(dev->driver);
682 struct platform_device *pdev = to_platform_device(dev);
683 int ret = 0;
685 if (dev->driver && pdrv->suspend)
686 ret = pdrv->suspend(pdev, mesg);
688 return ret;
691 static int platform_legacy_resume(struct device *dev)
693 struct platform_driver *pdrv = to_platform_driver(dev->driver);
694 struct platform_device *pdev = to_platform_device(dev);
695 int ret = 0;
697 if (dev->driver && pdrv->resume)
698 ret = pdrv->resume(pdev);
700 return ret;
703 int platform_pm_prepare(struct device *dev)
705 struct device_driver *drv = dev->driver;
706 int ret = 0;
708 if (drv && drv->pm && drv->pm->prepare)
709 ret = drv->pm->prepare(dev);
711 return ret;
714 void platform_pm_complete(struct device *dev)
716 struct device_driver *drv = dev->driver;
718 if (drv && drv->pm && drv->pm->complete)
719 drv->pm->complete(dev);
722 #endif /* CONFIG_PM_SLEEP */
724 #ifdef CONFIG_SUSPEND
726 int platform_pm_suspend(struct device *dev)
728 struct device_driver *drv = dev->driver;
729 int ret = 0;
731 if (!drv)
732 return 0;
734 if (drv->pm) {
735 if (drv->pm->suspend)
736 ret = drv->pm->suspend(dev);
737 } else {
738 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
741 return ret;
744 int platform_pm_suspend_noirq(struct device *dev)
746 struct device_driver *drv = dev->driver;
747 int ret = 0;
749 if (!drv)
750 return 0;
752 if (drv->pm) {
753 if (drv->pm->suspend_noirq)
754 ret = drv->pm->suspend_noirq(dev);
757 return ret;
760 int platform_pm_resume(struct device *dev)
762 struct device_driver *drv = dev->driver;
763 int ret = 0;
765 if (!drv)
766 return 0;
768 if (drv->pm) {
769 if (drv->pm->resume)
770 ret = drv->pm->resume(dev);
771 } else {
772 ret = platform_legacy_resume(dev);
775 return ret;
778 int platform_pm_resume_noirq(struct device *dev)
780 struct device_driver *drv = dev->driver;
781 int ret = 0;
783 if (!drv)
784 return 0;
786 if (drv->pm) {
787 if (drv->pm->resume_noirq)
788 ret = drv->pm->resume_noirq(dev);
791 return ret;
794 #endif /* CONFIG_SUSPEND */
796 #ifdef CONFIG_HIBERNATE_CALLBACKS
798 int platform_pm_freeze(struct device *dev)
800 struct device_driver *drv = dev->driver;
801 int ret = 0;
803 if (!drv)
804 return 0;
806 if (drv->pm) {
807 if (drv->pm->freeze)
808 ret = drv->pm->freeze(dev);
809 } else {
810 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
813 return ret;
816 int platform_pm_freeze_noirq(struct device *dev)
818 struct device_driver *drv = dev->driver;
819 int ret = 0;
821 if (!drv)
822 return 0;
824 if (drv->pm) {
825 if (drv->pm->freeze_noirq)
826 ret = drv->pm->freeze_noirq(dev);
829 return ret;
832 int platform_pm_thaw(struct device *dev)
834 struct device_driver *drv = dev->driver;
835 int ret = 0;
837 if (!drv)
838 return 0;
840 if (drv->pm) {
841 if (drv->pm->thaw)
842 ret = drv->pm->thaw(dev);
843 } else {
844 ret = platform_legacy_resume(dev);
847 return ret;
850 int platform_pm_thaw_noirq(struct device *dev)
852 struct device_driver *drv = dev->driver;
853 int ret = 0;
855 if (!drv)
856 return 0;
858 if (drv->pm) {
859 if (drv->pm->thaw_noirq)
860 ret = drv->pm->thaw_noirq(dev);
863 return ret;
866 int platform_pm_poweroff(struct device *dev)
868 struct device_driver *drv = dev->driver;
869 int ret = 0;
871 if (!drv)
872 return 0;
874 if (drv->pm) {
875 if (drv->pm->poweroff)
876 ret = drv->pm->poweroff(dev);
877 } else {
878 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
881 return ret;
884 int platform_pm_poweroff_noirq(struct device *dev)
886 struct device_driver *drv = dev->driver;
887 int ret = 0;
889 if (!drv)
890 return 0;
892 if (drv->pm) {
893 if (drv->pm->poweroff_noirq)
894 ret = drv->pm->poweroff_noirq(dev);
897 return ret;
900 int platform_pm_restore(struct device *dev)
902 struct device_driver *drv = dev->driver;
903 int ret = 0;
905 if (!drv)
906 return 0;
908 if (drv->pm) {
909 if (drv->pm->restore)
910 ret = drv->pm->restore(dev);
911 } else {
912 ret = platform_legacy_resume(dev);
915 return ret;
918 int platform_pm_restore_noirq(struct device *dev)
920 struct device_driver *drv = dev->driver;
921 int ret = 0;
923 if (!drv)
924 return 0;
926 if (drv->pm) {
927 if (drv->pm->restore_noirq)
928 ret = drv->pm->restore_noirq(dev);
931 return ret;
934 #endif /* CONFIG_HIBERNATE_CALLBACKS */
936 static const struct dev_pm_ops platform_dev_pm_ops = {
937 .runtime_suspend = pm_generic_runtime_suspend,
938 .runtime_resume = pm_generic_runtime_resume,
939 .runtime_idle = pm_generic_runtime_idle,
940 USE_PLATFORM_PM_SLEEP_OPS
943 struct bus_type platform_bus_type = {
944 .name = "platform",
945 .dev_attrs = platform_dev_attrs,
946 .match = platform_match,
947 .uevent = platform_uevent,
948 .pm = &platform_dev_pm_ops,
950 EXPORT_SYMBOL_GPL(platform_bus_type);
952 int __init platform_bus_init(void)
954 int error;
956 early_platform_cleanup();
958 error = device_register(&platform_bus);
959 if (error)
960 return error;
961 error = bus_register(&platform_bus_type);
962 if (error)
963 device_unregister(&platform_bus);
964 return error;
967 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
968 u64 dma_get_required_mask(struct device *dev)
970 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
971 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
972 u64 mask;
974 if (!high_totalram) {
975 /* convert to mask just covering totalram */
976 low_totalram = (1 << (fls(low_totalram) - 1));
977 low_totalram += low_totalram - 1;
978 mask = low_totalram;
979 } else {
980 high_totalram = (1 << (fls(high_totalram) - 1));
981 high_totalram += high_totalram - 1;
982 mask = (((u64)high_totalram) << 32) + 0xffffffff;
984 return mask;
986 EXPORT_SYMBOL_GPL(dma_get_required_mask);
987 #endif
989 static __initdata LIST_HEAD(early_platform_driver_list);
990 static __initdata LIST_HEAD(early_platform_device_list);
993 * early_platform_driver_register - register early platform driver
994 * @epdrv: early_platform driver structure
995 * @buf: string passed from early_param()
997 * Helper function for early_platform_init() / early_platform_init_buffer()
999 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1000 char *buf)
1002 char *tmp;
1003 int n;
1005 /* Simply add the driver to the end of the global list.
1006 * Drivers will by default be put on the list in compiled-in order.
1008 if (!epdrv->list.next) {
1009 INIT_LIST_HEAD(&epdrv->list);
1010 list_add_tail(&epdrv->list, &early_platform_driver_list);
1013 /* If the user has specified device then make sure the driver
1014 * gets prioritized. The driver of the last device specified on
1015 * command line will be put first on the list.
1017 n = strlen(epdrv->pdrv->driver.name);
1018 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1019 list_move(&epdrv->list, &early_platform_driver_list);
1021 /* Allow passing parameters after device name */
1022 if (buf[n] == '\0' || buf[n] == ',')
1023 epdrv->requested_id = -1;
1024 else {
1025 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1026 &tmp, 10);
1028 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1029 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1030 n = 0;
1031 } else
1032 n += strcspn(&buf[n + 1], ",") + 1;
1035 if (buf[n] == ',')
1036 n++;
1038 if (epdrv->bufsize) {
1039 memcpy(epdrv->buffer, &buf[n],
1040 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1041 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1045 return 0;
1049 * early_platform_add_devices - adds a number of early platform devices
1050 * @devs: array of early platform devices to add
1051 * @num: number of early platform devices in array
1053 * Used by early architecture code to register early platform devices and
1054 * their platform data.
1056 void __init early_platform_add_devices(struct platform_device **devs, int num)
1058 struct device *dev;
1059 int i;
1061 /* simply add the devices to list */
1062 for (i = 0; i < num; i++) {
1063 dev = &devs[i]->dev;
1065 if (!dev->devres_head.next) {
1066 INIT_LIST_HEAD(&dev->devres_head);
1067 list_add_tail(&dev->devres_head,
1068 &early_platform_device_list);
1074 * early_platform_driver_register_all - register early platform drivers
1075 * @class_str: string to identify early platform driver class
1077 * Used by architecture code to register all early platform drivers
1078 * for a certain class. If omitted then only early platform drivers
1079 * with matching kernel command line class parameters will be registered.
1081 void __init early_platform_driver_register_all(char *class_str)
1083 /* The "class_str" parameter may or may not be present on the kernel
1084 * command line. If it is present then there may be more than one
1085 * matching parameter.
1087 * Since we register our early platform drivers using early_param()
1088 * we need to make sure that they also get registered in the case
1089 * when the parameter is missing from the kernel command line.
1091 * We use parse_early_options() to make sure the early_param() gets
1092 * called at least once. The early_param() may be called more than
1093 * once since the name of the preferred device may be specified on
1094 * the kernel command line. early_platform_driver_register() handles
1095 * this case for us.
1097 parse_early_options(class_str);
1101 * early_platform_match - find early platform device matching driver
1102 * @epdrv: early platform driver structure
1103 * @id: id to match against
1105 static __init struct platform_device *
1106 early_platform_match(struct early_platform_driver *epdrv, int id)
1108 struct platform_device *pd;
1110 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1111 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1112 if (pd->id == id)
1113 return pd;
1115 return NULL;
1119 * early_platform_left - check if early platform driver has matching devices
1120 * @epdrv: early platform driver structure
1121 * @id: return true if id or above exists
1123 static __init int early_platform_left(struct early_platform_driver *epdrv,
1124 int id)
1126 struct platform_device *pd;
1128 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1129 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1130 if (pd->id >= id)
1131 return 1;
1133 return 0;
1137 * early_platform_driver_probe_id - probe drivers matching class_str and id
1138 * @class_str: string to identify early platform driver class
1139 * @id: id to match against
1140 * @nr_probe: number of platform devices to successfully probe before exiting
1142 static int __init early_platform_driver_probe_id(char *class_str,
1143 int id,
1144 int nr_probe)
1146 struct early_platform_driver *epdrv;
1147 struct platform_device *match;
1148 int match_id;
1149 int n = 0;
1150 int left = 0;
1152 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1153 /* only use drivers matching our class_str */
1154 if (strcmp(class_str, epdrv->class_str))
1155 continue;
1157 if (id == -2) {
1158 match_id = epdrv->requested_id;
1159 left = 1;
1161 } else {
1162 match_id = id;
1163 left += early_platform_left(epdrv, id);
1165 /* skip requested id */
1166 switch (epdrv->requested_id) {
1167 case EARLY_PLATFORM_ID_ERROR:
1168 case EARLY_PLATFORM_ID_UNSET:
1169 break;
1170 default:
1171 if (epdrv->requested_id == id)
1172 match_id = EARLY_PLATFORM_ID_UNSET;
1176 switch (match_id) {
1177 case EARLY_PLATFORM_ID_ERROR:
1178 pr_warning("%s: unable to parse %s parameter\n",
1179 class_str, epdrv->pdrv->driver.name);
1180 /* fall-through */
1181 case EARLY_PLATFORM_ID_UNSET:
1182 match = NULL;
1183 break;
1184 default:
1185 match = early_platform_match(epdrv, match_id);
1188 if (match) {
1190 * Set up a sensible init_name to enable
1191 * dev_name() and others to be used before the
1192 * rest of the driver core is initialized.
1194 if (!match->dev.init_name && slab_is_available()) {
1195 if (match->id != -1)
1196 match->dev.init_name =
1197 kasprintf(GFP_KERNEL, "%s.%d",
1198 match->name,
1199 match->id);
1200 else
1201 match->dev.init_name =
1202 kasprintf(GFP_KERNEL, "%s",
1203 match->name);
1205 if (!match->dev.init_name)
1206 return -ENOMEM;
1209 if (epdrv->pdrv->probe(match))
1210 pr_warning("%s: unable to probe %s early.\n",
1211 class_str, match->name);
1212 else
1213 n++;
1216 if (n >= nr_probe)
1217 break;
1220 if (left)
1221 return n;
1222 else
1223 return -ENODEV;
1227 * early_platform_driver_probe - probe a class of registered drivers
1228 * @class_str: string to identify early platform driver class
1229 * @nr_probe: number of platform devices to successfully probe before exiting
1230 * @user_only: only probe user specified early platform devices
1232 * Used by architecture code to probe registered early platform drivers
1233 * within a certain class. For probe to happen a registered early platform
1234 * device matching a registered early platform driver is needed.
1236 int __init early_platform_driver_probe(char *class_str,
1237 int nr_probe,
1238 int user_only)
1240 int k, n, i;
1242 n = 0;
1243 for (i = -2; n < nr_probe; i++) {
1244 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1246 if (k < 0)
1247 break;
1249 n += k;
1251 if (user_only)
1252 break;
1255 return n;
1259 * early_platform_cleanup - clean up early platform code
1261 void __init early_platform_cleanup(void)
1263 struct platform_device *pd, *pd2;
1265 /* clean up the devres list used to chain devices */
1266 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1267 dev.devres_head) {
1268 list_del(&pd->dev.devres_head);
1269 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));