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
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>
31 #include "power/power.h"
33 /* For automatically allocated device IDs */
34 static DEFINE_IDA(platform_devid_ida);
36 struct device platform_bus = {
37 .init_name = "platform",
39 EXPORT_SYMBOL_GPL(platform_bus);
42 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
43 * @pdev: platform device
45 * This is called before platform_device_add() such that any pdev_archdata may
46 * be setup before the platform_notifier is called. So if a user needs to
47 * manipulate any relevant information in the pdev_archdata they can do:
49 * platform_device_alloc()
51 * platform_device_add()
53 * And if they don't care they can just call platform_device_register() and
54 * everything will just work out.
56 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
61 * platform_get_resource - get a resource for a device
62 * @dev: platform device
63 * @type: resource type
64 * @num: resource index
66 struct resource *platform_get_resource(struct platform_device *dev,
67 unsigned int type, unsigned int num)
71 for (i = 0; i < dev->num_resources; i++) {
72 struct resource *r = &dev->resource[i];
74 if (type == resource_type(r) && num-- == 0)
79 EXPORT_SYMBOL_GPL(platform_get_resource);
82 * platform_get_irq - get an IRQ for a device
83 * @dev: platform device
84 * @num: IRQ number index
86 int platform_get_irq(struct platform_device *dev, unsigned int num)
89 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
90 if (!dev || num >= dev->archdata.num_irqs)
92 return dev->archdata.irqs[num];
95 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
98 ret = of_irq_get(dev->dev.of_node, num);
99 if (ret >= 0 || ret == -EPROBE_DEFER)
103 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
105 * The resources may pass trigger flags to the irqs that need
106 * to be set up. It so happens that the trigger flags for
107 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
110 if (r && r->flags & IORESOURCE_BITS)
111 irqd_set_trigger_type(irq_get_irq_data(r->start),
112 r->flags & IORESOURCE_BITS);
114 return r ? r->start : -ENXIO;
117 EXPORT_SYMBOL_GPL(platform_get_irq);
120 * platform_irq_count - Count the number of IRQs a platform device uses
121 * @dev: platform device
123 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
125 int platform_irq_count(struct platform_device *dev)
129 while ((ret = platform_get_irq(dev, nr)) >= 0)
132 if (ret == -EPROBE_DEFER)
137 EXPORT_SYMBOL_GPL(platform_irq_count);
140 * platform_get_resource_byname - get a resource for a device by name
141 * @dev: platform device
142 * @type: resource type
143 * @name: resource name
145 struct resource *platform_get_resource_byname(struct platform_device *dev,
151 for (i = 0; i < dev->num_resources; i++) {
152 struct resource *r = &dev->resource[i];
154 if (unlikely(!r->name))
157 if (type == resource_type(r) && !strcmp(r->name, name))
162 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
165 * platform_get_irq_byname - get an IRQ for a device by name
166 * @dev: platform device
169 int platform_get_irq_byname(struct platform_device *dev, const char *name)
173 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
176 ret = of_irq_get_byname(dev->dev.of_node, name);
177 if (ret >= 0 || ret == -EPROBE_DEFER)
181 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
182 return r ? r->start : -ENXIO;
184 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
187 * platform_add_devices - add a numbers of platform devices
188 * @devs: array of platform devices to add
189 * @num: number of platform devices in array
191 int platform_add_devices(struct platform_device **devs, int num)
195 for (i = 0; i < num; i++) {
196 ret = platform_device_register(devs[i]);
199 platform_device_unregister(devs[i]);
206 EXPORT_SYMBOL_GPL(platform_add_devices);
208 struct platform_object {
209 struct platform_device pdev;
214 * platform_device_put - destroy a platform device
215 * @pdev: platform device to free
217 * Free all memory associated with a platform device. This function must
218 * _only_ be externally called in error cases. All other usage is a bug.
220 void platform_device_put(struct platform_device *pdev)
223 put_device(&pdev->dev);
225 EXPORT_SYMBOL_GPL(platform_device_put);
227 static void platform_device_release(struct device *dev)
229 struct platform_object *pa = container_of(dev, struct platform_object,
232 of_device_node_put(&pa->pdev.dev);
233 kfree(pa->pdev.dev.platform_data);
234 kfree(pa->pdev.mfd_cell);
235 kfree(pa->pdev.resource);
236 kfree(pa->pdev.driver_override);
241 * platform_device_alloc - create a platform device
242 * @name: base name of the device we're adding
245 * Create a platform device object which can have other objects attached
246 * to it, and which will have attached objects freed when it is released.
248 struct platform_device *platform_device_alloc(const char *name, int id)
250 struct platform_object *pa;
252 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
254 strcpy(pa->name, name);
255 pa->pdev.name = pa->name;
257 device_initialize(&pa->pdev.dev);
258 pa->pdev.dev.release = platform_device_release;
259 arch_setup_pdev_archdata(&pa->pdev);
262 return pa ? &pa->pdev : NULL;
264 EXPORT_SYMBOL_GPL(platform_device_alloc);
267 * platform_device_add_resources - add resources to a platform device
268 * @pdev: platform device allocated by platform_device_alloc to add resources to
269 * @res: set of resources that needs to be allocated for the device
270 * @num: number of resources
272 * Add a copy of the resources to the platform device. The memory
273 * associated with the resources will be freed when the platform device is
276 int platform_device_add_resources(struct platform_device *pdev,
277 const struct resource *res, unsigned int num)
279 struct resource *r = NULL;
282 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
287 kfree(pdev->resource);
289 pdev->num_resources = num;
292 EXPORT_SYMBOL_GPL(platform_device_add_resources);
295 * platform_device_add_data - add platform-specific data to a platform device
296 * @pdev: platform device allocated by platform_device_alloc to add resources to
297 * @data: platform specific data for this platform device
298 * @size: size of platform specific data
300 * Add a copy of platform specific data to the platform device's
301 * platform_data pointer. The memory associated with the platform data
302 * will be freed when the platform device is released.
304 int platform_device_add_data(struct platform_device *pdev, const void *data,
310 d = kmemdup(data, size, GFP_KERNEL);
315 kfree(pdev->dev.platform_data);
316 pdev->dev.platform_data = d;
319 EXPORT_SYMBOL_GPL(platform_device_add_data);
322 * platform_device_add - add a platform device to device hierarchy
323 * @pdev: platform device we're adding
325 * This is part 2 of platform_device_register(), though may be called
326 * separately _iff_ pdev was allocated by platform_device_alloc().
328 int platform_device_add(struct platform_device *pdev)
335 if (!pdev->dev.parent)
336 pdev->dev.parent = &platform_bus;
338 pdev->dev.bus = &platform_bus_type;
342 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
344 case PLATFORM_DEVID_NONE:
345 dev_set_name(&pdev->dev, "%s", pdev->name);
347 case PLATFORM_DEVID_AUTO:
349 * Automatically allocated device ID. We mark it as such so
350 * that we remember it must be freed, and we append a suffix
351 * to avoid namespace collision with explicit IDs.
353 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
357 pdev->id_auto = true;
358 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
362 for (i = 0; i < pdev->num_resources; i++) {
363 struct resource *p, *r = &pdev->resource[i];
366 r->name = dev_name(&pdev->dev);
370 if (resource_type(r) == IORESOURCE_MEM)
372 else if (resource_type(r) == IORESOURCE_IO)
373 p = &ioport_resource;
376 if (p && insert_resource(p, r)) {
377 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
383 pr_debug("Registering platform device '%s'. Parent at %s\n",
384 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
386 ret = device_add(&pdev->dev);
392 ida_simple_remove(&platform_devid_ida, pdev->id);
393 pdev->id = PLATFORM_DEVID_AUTO;
397 struct resource *r = &pdev->resource[i];
405 EXPORT_SYMBOL_GPL(platform_device_add);
408 * platform_device_del - remove a platform-level device
409 * @pdev: platform device we're removing
411 * Note that this function will also release all memory- and port-based
412 * resources owned by the device (@dev->resource). This function must
413 * _only_ be externally called in error cases. All other usage is a bug.
415 void platform_device_del(struct platform_device *pdev)
420 device_del(&pdev->dev);
423 ida_simple_remove(&platform_devid_ida, pdev->id);
424 pdev->id = PLATFORM_DEVID_AUTO;
427 for (i = 0; i < pdev->num_resources; i++) {
428 struct resource *r = &pdev->resource[i];
434 EXPORT_SYMBOL_GPL(platform_device_del);
437 * platform_device_register - add a platform-level device
438 * @pdev: platform device we're adding
440 int platform_device_register(struct platform_device *pdev)
442 device_initialize(&pdev->dev);
443 arch_setup_pdev_archdata(pdev);
444 return platform_device_add(pdev);
446 EXPORT_SYMBOL_GPL(platform_device_register);
449 * platform_device_unregister - unregister a platform-level device
450 * @pdev: platform device we're unregistering
452 * Unregistration is done in 2 steps. First we release all resources
453 * and remove it from the subsystem, then we drop reference count by
454 * calling platform_device_put().
456 void platform_device_unregister(struct platform_device *pdev)
458 platform_device_del(pdev);
459 platform_device_put(pdev);
461 EXPORT_SYMBOL_GPL(platform_device_unregister);
464 * platform_device_register_full - add a platform-level device with
465 * resources and platform-specific data
467 * @pdevinfo: data used to create device
469 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
471 struct platform_device *platform_device_register_full(
472 const struct platform_device_info *pdevinfo)
475 struct platform_device *pdev;
477 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
481 pdev->dev.parent = pdevinfo->parent;
482 pdev->dev.fwnode = pdevinfo->fwnode;
484 if (pdevinfo->dma_mask) {
486 * This memory isn't freed when the device is put,
487 * I don't have a nice idea for that though. Conceptually
488 * dma_mask in struct device should not be a pointer.
489 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
492 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
493 if (!pdev->dev.dma_mask)
496 *pdev->dev.dma_mask = pdevinfo->dma_mask;
497 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
500 ret = platform_device_add_resources(pdev,
501 pdevinfo->res, pdevinfo->num_res);
505 ret = platform_device_add_data(pdev,
506 pdevinfo->data, pdevinfo->size_data);
510 ret = platform_device_add(pdev);
513 ACPI_COMPANION_SET(&pdev->dev, NULL);
514 kfree(pdev->dev.dma_mask);
517 platform_device_put(pdev);
523 EXPORT_SYMBOL_GPL(platform_device_register_full);
525 static int platform_drv_probe(struct device *_dev)
527 struct platform_driver *drv = to_platform_driver(_dev->driver);
528 struct platform_device *dev = to_platform_device(_dev);
531 ret = of_clk_set_defaults(_dev->of_node, false);
535 ret = dev_pm_domain_attach(_dev, true);
536 if (ret != -EPROBE_DEFER && drv->probe) {
537 ret = drv->probe(dev);
539 dev_pm_domain_detach(_dev, true);
542 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
543 dev_warn(_dev, "probe deferral not supported\n");
550 static int platform_drv_probe_fail(struct device *_dev)
555 static int platform_drv_remove(struct device *_dev)
557 struct platform_driver *drv = to_platform_driver(_dev->driver);
558 struct platform_device *dev = to_platform_device(_dev);
562 ret = drv->remove(dev);
563 dev_pm_domain_detach(_dev, true);
568 static void platform_drv_shutdown(struct device *_dev)
570 struct platform_driver *drv = to_platform_driver(_dev->driver);
571 struct platform_device *dev = to_platform_device(_dev);
575 dev_pm_domain_detach(_dev, true);
579 * __platform_driver_register - register a driver for platform-level devices
580 * @drv: platform driver structure
581 * @owner: owning module/driver
583 int __platform_driver_register(struct platform_driver *drv,
584 struct module *owner)
586 drv->driver.owner = owner;
587 drv->driver.bus = &platform_bus_type;
588 drv->driver.probe = platform_drv_probe;
589 drv->driver.remove = platform_drv_remove;
590 drv->driver.shutdown = platform_drv_shutdown;
592 return driver_register(&drv->driver);
594 EXPORT_SYMBOL_GPL(__platform_driver_register);
597 * platform_driver_unregister - unregister a driver for platform-level devices
598 * @drv: platform driver structure
600 void platform_driver_unregister(struct platform_driver *drv)
602 driver_unregister(&drv->driver);
604 EXPORT_SYMBOL_GPL(platform_driver_unregister);
607 * __platform_driver_probe - register driver for non-hotpluggable device
608 * @drv: platform driver structure
609 * @probe: the driver probe routine, probably from an __init section
610 * @module: module which will be the owner of the driver
612 * Use this instead of platform_driver_register() when you know the device
613 * is not hotpluggable and has already been registered, and you want to
614 * remove its run-once probe() infrastructure from memory after the driver
615 * has bound to the device.
617 * One typical use for this would be with drivers for controllers integrated
618 * into system-on-chip processors, where the controller devices have been
619 * configured as part of board setup.
621 * Note that this is incompatible with deferred probing.
623 * Returns zero if the driver registered and bound to a device, else returns
624 * a negative error code and with the driver not registered.
626 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
627 int (*probe)(struct platform_device *), struct module *module)
631 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
632 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
633 drv->driver.name, __func__);
638 * We have to run our probes synchronously because we check if
639 * we find any devices to bind to and exit with error if there
642 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
645 * Prevent driver from requesting probe deferral to avoid further
646 * futile probe attempts.
648 drv->prevent_deferred_probe = true;
650 /* make sure driver won't have bind/unbind attributes */
651 drv->driver.suppress_bind_attrs = true;
653 /* temporary section violation during probe() */
655 retval = code = __platform_driver_register(drv, module);
658 * Fixup that section violation, being paranoid about code scanning
659 * the list of drivers in order to probe new devices. Check to see
660 * if the probe was successful, and make sure any forced probes of
663 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
665 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
667 drv->driver.probe = platform_drv_probe_fail;
668 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
671 platform_driver_unregister(drv);
674 EXPORT_SYMBOL_GPL(__platform_driver_probe);
677 * __platform_create_bundle - register driver and create corresponding device
678 * @driver: platform driver structure
679 * @probe: the driver probe routine, probably from an __init section
680 * @res: set of resources that needs to be allocated for the device
681 * @n_res: number of resources
682 * @data: platform specific data for this platform device
683 * @size: size of platform specific data
684 * @module: module which will be the owner of the driver
686 * Use this in legacy-style modules that probe hardware directly and
687 * register a single platform device and corresponding platform driver.
689 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
691 struct platform_device * __init_or_module __platform_create_bundle(
692 struct platform_driver *driver,
693 int (*probe)(struct platform_device *),
694 struct resource *res, unsigned int n_res,
695 const void *data, size_t size, struct module *module)
697 struct platform_device *pdev;
700 pdev = platform_device_alloc(driver->driver.name, -1);
706 error = platform_device_add_resources(pdev, res, n_res);
710 error = platform_device_add_data(pdev, data, size);
714 error = platform_device_add(pdev);
718 error = __platform_driver_probe(driver, probe, module);
725 platform_device_del(pdev);
727 platform_device_put(pdev);
729 return ERR_PTR(error);
731 EXPORT_SYMBOL_GPL(__platform_create_bundle);
734 * __platform_register_drivers - register an array of platform drivers
735 * @drivers: an array of drivers to register
736 * @count: the number of drivers to register
737 * @owner: module owning the drivers
739 * Registers platform drivers specified by an array. On failure to register a
740 * driver, all previously registered drivers will be unregistered. Callers of
741 * this API should use platform_unregister_drivers() to unregister drivers in
744 * Returns: 0 on success or a negative error code on failure.
746 int __platform_register_drivers(struct platform_driver * const *drivers,
747 unsigned int count, struct module *owner)
752 for (i = 0; i < count; i++) {
753 pr_debug("registering platform driver %ps\n", drivers[i]);
755 err = __platform_driver_register(drivers[i], owner);
757 pr_err("failed to register platform driver %ps: %d\n",
767 pr_debug("unregistering platform driver %ps\n", drivers[i]);
768 platform_driver_unregister(drivers[i]);
773 EXPORT_SYMBOL_GPL(__platform_register_drivers);
776 * platform_unregister_drivers - unregister an array of platform drivers
777 * @drivers: an array of drivers to unregister
778 * @count: the number of drivers to unregister
780 * Unegisters platform drivers specified by an array. This is typically used
781 * to complement an earlier call to platform_register_drivers(). Drivers are
782 * unregistered in the reverse order in which they were registered.
784 void platform_unregister_drivers(struct platform_driver * const *drivers,
788 pr_debug("unregistering platform driver %ps\n", drivers[count]);
789 platform_driver_unregister(drivers[count]);
792 EXPORT_SYMBOL_GPL(platform_unregister_drivers);
794 /* modalias support enables more hands-off userspace setup:
795 * (a) environment variable lets new-style hotplug events work once system is
796 * fully running: "modprobe $MODALIAS"
797 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
798 * mishandled before system is fully running: "modprobe $(cat modalias)"
800 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
803 struct platform_device *pdev = to_platform_device(dev);
806 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
810 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
814 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
816 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
818 static DEVICE_ATTR_RO(modalias);
820 static ssize_t driver_override_store(struct device *dev,
821 struct device_attribute *attr,
822 const char *buf, size_t count)
824 struct platform_device *pdev = to_platform_device(dev);
825 char *driver_override, *old = pdev->driver_override, *cp;
827 if (count > PATH_MAX)
830 driver_override = kstrndup(buf, count, GFP_KERNEL);
831 if (!driver_override)
834 cp = strchr(driver_override, '\n');
838 if (strlen(driver_override)) {
839 pdev->driver_override = driver_override;
841 kfree(driver_override);
842 pdev->driver_override = NULL;
850 static ssize_t driver_override_show(struct device *dev,
851 struct device_attribute *attr, char *buf)
853 struct platform_device *pdev = to_platform_device(dev);
855 return sprintf(buf, "%s\n", pdev->driver_override);
857 static DEVICE_ATTR_RW(driver_override);
860 static struct attribute *platform_dev_attrs[] = {
861 &dev_attr_modalias.attr,
862 &dev_attr_driver_override.attr,
865 ATTRIBUTE_GROUPS(platform_dev);
867 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
869 struct platform_device *pdev = to_platform_device(dev);
872 /* Some devices have extra OF data and an OF-style MODALIAS */
873 rc = of_device_uevent_modalias(dev, env);
877 rc = acpi_device_uevent_modalias(dev, env);
881 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
886 static const struct platform_device_id *platform_match_id(
887 const struct platform_device_id *id,
888 struct platform_device *pdev)
890 while (id->name[0]) {
891 if (strcmp(pdev->name, id->name) == 0) {
901 * platform_match - bind platform device to platform driver.
905 * Platform device IDs are assumed to be encoded like this:
906 * "<name><instance>", where <name> is a short description of the type of
907 * device, like "pci" or "floppy", and <instance> is the enumerated
908 * instance of the device, like '0' or '42'. Driver IDs are simply
909 * "<name>". So, extract the <name> from the platform_device structure,
910 * and compare it against the name of the driver. Return whether they match
913 static int platform_match(struct device *dev, struct device_driver *drv)
915 struct platform_device *pdev = to_platform_device(dev);
916 struct platform_driver *pdrv = to_platform_driver(drv);
918 /* When driver_override is set, only bind to the matching driver */
919 if (pdev->driver_override)
920 return !strcmp(pdev->driver_override, drv->name);
922 /* Attempt an OF style match first */
923 if (of_driver_match_device(dev, drv))
926 /* Then try ACPI style match */
927 if (acpi_driver_match_device(dev, drv))
930 /* Then try to match against the id table */
932 return platform_match_id(pdrv->id_table, pdev) != NULL;
934 /* fall-back to driver name match */
935 return (strcmp(pdev->name, drv->name) == 0);
938 #ifdef CONFIG_PM_SLEEP
940 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
942 struct platform_driver *pdrv = to_platform_driver(dev->driver);
943 struct platform_device *pdev = to_platform_device(dev);
946 if (dev->driver && pdrv->suspend)
947 ret = pdrv->suspend(pdev, mesg);
952 static int platform_legacy_resume(struct device *dev)
954 struct platform_driver *pdrv = to_platform_driver(dev->driver);
955 struct platform_device *pdev = to_platform_device(dev);
958 if (dev->driver && pdrv->resume)
959 ret = pdrv->resume(pdev);
964 #endif /* CONFIG_PM_SLEEP */
966 #ifdef CONFIG_SUSPEND
968 int platform_pm_suspend(struct device *dev)
970 struct device_driver *drv = dev->driver;
977 if (drv->pm->suspend)
978 ret = drv->pm->suspend(dev);
980 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
986 int platform_pm_resume(struct device *dev)
988 struct device_driver *drv = dev->driver;
996 ret = drv->pm->resume(dev);
998 ret = platform_legacy_resume(dev);
1004 #endif /* CONFIG_SUSPEND */
1006 #ifdef CONFIG_HIBERNATE_CALLBACKS
1008 int platform_pm_freeze(struct device *dev)
1010 struct device_driver *drv = dev->driver;
1017 if (drv->pm->freeze)
1018 ret = drv->pm->freeze(dev);
1020 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1026 int platform_pm_thaw(struct device *dev)
1028 struct device_driver *drv = dev->driver;
1036 ret = drv->pm->thaw(dev);
1038 ret = platform_legacy_resume(dev);
1044 int platform_pm_poweroff(struct device *dev)
1046 struct device_driver *drv = dev->driver;
1053 if (drv->pm->poweroff)
1054 ret = drv->pm->poweroff(dev);
1056 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1062 int platform_pm_restore(struct device *dev)
1064 struct device_driver *drv = dev->driver;
1071 if (drv->pm->restore)
1072 ret = drv->pm->restore(dev);
1074 ret = platform_legacy_resume(dev);
1080 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1082 static const struct dev_pm_ops platform_dev_pm_ops = {
1083 .runtime_suspend = pm_generic_runtime_suspend,
1084 .runtime_resume = pm_generic_runtime_resume,
1085 USE_PLATFORM_PM_SLEEP_OPS
1088 struct bus_type platform_bus_type = {
1090 .dev_groups = platform_dev_groups,
1091 .match = platform_match,
1092 .uevent = platform_uevent,
1093 .pm = &platform_dev_pm_ops,
1095 EXPORT_SYMBOL_GPL(platform_bus_type);
1097 int __init platform_bus_init(void)
1101 early_platform_cleanup();
1103 error = device_register(&platform_bus);
1106 error = bus_register(&platform_bus_type);
1108 device_unregister(&platform_bus);
1109 of_platform_register_reconfig_notifier();
1113 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1114 u64 dma_get_required_mask(struct device *dev)
1116 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1117 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1120 if (!high_totalram) {
1121 /* convert to mask just covering totalram */
1122 low_totalram = (1 << (fls(low_totalram) - 1));
1123 low_totalram += low_totalram - 1;
1124 mask = low_totalram;
1126 high_totalram = (1 << (fls(high_totalram) - 1));
1127 high_totalram += high_totalram - 1;
1128 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1132 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1135 static __initdata LIST_HEAD(early_platform_driver_list);
1136 static __initdata LIST_HEAD(early_platform_device_list);
1139 * early_platform_driver_register - register early platform driver
1140 * @epdrv: early_platform driver structure
1141 * @buf: string passed from early_param()
1143 * Helper function for early_platform_init() / early_platform_init_buffer()
1145 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1151 /* Simply add the driver to the end of the global list.
1152 * Drivers will by default be put on the list in compiled-in order.
1154 if (!epdrv->list.next) {
1155 INIT_LIST_HEAD(&epdrv->list);
1156 list_add_tail(&epdrv->list, &early_platform_driver_list);
1159 /* If the user has specified device then make sure the driver
1160 * gets prioritized. The driver of the last device specified on
1161 * command line will be put first on the list.
1163 n = strlen(epdrv->pdrv->driver.name);
1164 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1165 list_move(&epdrv->list, &early_platform_driver_list);
1167 /* Allow passing parameters after device name */
1168 if (buf[n] == '\0' || buf[n] == ',')
1169 epdrv->requested_id = -1;
1171 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1174 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1175 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1178 n += strcspn(&buf[n + 1], ",") + 1;
1184 if (epdrv->bufsize) {
1185 memcpy(epdrv->buffer, &buf[n],
1186 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1187 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1195 * early_platform_add_devices - adds a number of early platform devices
1196 * @devs: array of early platform devices to add
1197 * @num: number of early platform devices in array
1199 * Used by early architecture code to register early platform devices and
1200 * their platform data.
1202 void __init early_platform_add_devices(struct platform_device **devs, int num)
1207 /* simply add the devices to list */
1208 for (i = 0; i < num; i++) {
1209 dev = &devs[i]->dev;
1211 if (!dev->devres_head.next) {
1212 pm_runtime_early_init(dev);
1213 INIT_LIST_HEAD(&dev->devres_head);
1214 list_add_tail(&dev->devres_head,
1215 &early_platform_device_list);
1221 * early_platform_driver_register_all - register early platform drivers
1222 * @class_str: string to identify early platform driver class
1224 * Used by architecture code to register all early platform drivers
1225 * for a certain class. If omitted then only early platform drivers
1226 * with matching kernel command line class parameters will be registered.
1228 void __init early_platform_driver_register_all(char *class_str)
1230 /* The "class_str" parameter may or may not be present on the kernel
1231 * command line. If it is present then there may be more than one
1232 * matching parameter.
1234 * Since we register our early platform drivers using early_param()
1235 * we need to make sure that they also get registered in the case
1236 * when the parameter is missing from the kernel command line.
1238 * We use parse_early_options() to make sure the early_param() gets
1239 * called at least once. The early_param() may be called more than
1240 * once since the name of the preferred device may be specified on
1241 * the kernel command line. early_platform_driver_register() handles
1244 parse_early_options(class_str);
1248 * early_platform_match - find early platform device matching driver
1249 * @epdrv: early platform driver structure
1250 * @id: id to match against
1252 static struct platform_device * __init
1253 early_platform_match(struct early_platform_driver *epdrv, int id)
1255 struct platform_device *pd;
1257 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1258 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1266 * early_platform_left - check if early platform driver has matching devices
1267 * @epdrv: early platform driver structure
1268 * @id: return true if id or above exists
1270 static int __init early_platform_left(struct early_platform_driver *epdrv,
1273 struct platform_device *pd;
1275 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1276 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1284 * early_platform_driver_probe_id - probe drivers matching class_str and id
1285 * @class_str: string to identify early platform driver class
1286 * @id: id to match against
1287 * @nr_probe: number of platform devices to successfully probe before exiting
1289 static int __init early_platform_driver_probe_id(char *class_str,
1293 struct early_platform_driver *epdrv;
1294 struct platform_device *match;
1299 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1300 /* only use drivers matching our class_str */
1301 if (strcmp(class_str, epdrv->class_str))
1305 match_id = epdrv->requested_id;
1310 left += early_platform_left(epdrv, id);
1312 /* skip requested id */
1313 switch (epdrv->requested_id) {
1314 case EARLY_PLATFORM_ID_ERROR:
1315 case EARLY_PLATFORM_ID_UNSET:
1318 if (epdrv->requested_id == id)
1319 match_id = EARLY_PLATFORM_ID_UNSET;
1324 case EARLY_PLATFORM_ID_ERROR:
1325 pr_warn("%s: unable to parse %s parameter\n",
1326 class_str, epdrv->pdrv->driver.name);
1328 case EARLY_PLATFORM_ID_UNSET:
1332 match = early_platform_match(epdrv, match_id);
1337 * Set up a sensible init_name to enable
1338 * dev_name() and others to be used before the
1339 * rest of the driver core is initialized.
1341 if (!match->dev.init_name && slab_is_available()) {
1342 if (match->id != -1)
1343 match->dev.init_name =
1344 kasprintf(GFP_KERNEL, "%s.%d",
1348 match->dev.init_name =
1349 kasprintf(GFP_KERNEL, "%s",
1352 if (!match->dev.init_name)
1356 if (epdrv->pdrv->probe(match))
1357 pr_warn("%s: unable to probe %s early.\n",
1358 class_str, match->name);
1374 * early_platform_driver_probe - probe a class of registered drivers
1375 * @class_str: string to identify early platform driver class
1376 * @nr_probe: number of platform devices to successfully probe before exiting
1377 * @user_only: only probe user specified early platform devices
1379 * Used by architecture code to probe registered early platform drivers
1380 * within a certain class. For probe to happen a registered early platform
1381 * device matching a registered early platform driver is needed.
1383 int __init early_platform_driver_probe(char *class_str,
1390 for (i = -2; n < nr_probe; i++) {
1391 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1406 * early_platform_cleanup - clean up early platform code
1408 void __init early_platform_cleanup(void)
1410 struct platform_device *pd, *pd2;
1412 /* clean up the devres list used to chain devices */
1413 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1415 list_del(&pd->dev.devres_head);
1416 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));