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>
29 #include <linux/property.h>
32 #include "power/power.h"
34 /* For automatically allocated device IDs */
35 static DEFINE_IDA(platform_devid_ida);
37 struct device platform_bus = {
38 .init_name = "platform",
40 EXPORT_SYMBOL_GPL(platform_bus);
43 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
44 * @pdev: platform device
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:
50 * platform_device_alloc()
52 * platform_device_add()
54 * And if they don't care they can just call platform_device_register() and
55 * everything will just work out.
57 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
62 * platform_get_resource - get a resource for a device
63 * @dev: platform device
64 * @type: resource type
65 * @num: resource index
67 struct resource *platform_get_resource(struct platform_device *dev,
68 unsigned int type, unsigned int num)
72 for (i = 0; i < dev->num_resources; i++) {
73 struct resource *r = &dev->resource[i];
75 if (type == resource_type(r) && num-- == 0)
80 EXPORT_SYMBOL_GPL(platform_get_resource);
83 * platform_get_irq - get an IRQ for a device
84 * @dev: platform device
85 * @num: IRQ number index
87 int platform_get_irq(struct platform_device *dev, unsigned int num)
90 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
91 if (!dev || num >= dev->archdata.num_irqs)
93 return dev->archdata.irqs[num];
96 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
99 ret = of_irq_get(dev->dev.of_node, num);
100 if (ret >= 0 || ret == -EPROBE_DEFER)
104 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
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*
111 if (r && r->flags & IORESOURCE_BITS)
112 irqd_set_trigger_type(irq_get_irq_data(r->start),
113 r->flags & IORESOURCE_BITS);
115 return r ? r->start : -ENXIO;
118 EXPORT_SYMBOL_GPL(platform_get_irq);
121 * platform_get_resource_byname - get a resource for a device by name
122 * @dev: platform device
123 * @type: resource type
124 * @name: resource name
126 struct resource *platform_get_resource_byname(struct platform_device *dev,
132 for (i = 0; i < dev->num_resources; i++) {
133 struct resource *r = &dev->resource[i];
135 if (unlikely(!r->name))
138 if (type == resource_type(r) && !strcmp(r->name, name))
143 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
146 * platform_get_irq_byname - get an IRQ for a device by name
147 * @dev: platform device
150 int platform_get_irq_byname(struct platform_device *dev, const char *name)
154 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
157 ret = of_irq_get_byname(dev->dev.of_node, name);
158 if (ret >= 0 || ret == -EPROBE_DEFER)
162 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
163 return r ? r->start : -ENXIO;
165 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
168 * platform_add_devices - add a numbers of platform devices
169 * @devs: array of platform devices to add
170 * @num: number of platform devices in array
172 int platform_add_devices(struct platform_device **devs, int num)
176 for (i = 0; i < num; i++) {
177 ret = platform_device_register(devs[i]);
180 platform_device_unregister(devs[i]);
187 EXPORT_SYMBOL_GPL(platform_add_devices);
189 struct platform_object {
190 struct platform_device pdev;
195 * platform_device_put - destroy a platform device
196 * @pdev: platform device to free
198 * Free all memory associated with a platform device. This function must
199 * _only_ be externally called in error cases. All other usage is a bug.
201 void platform_device_put(struct platform_device *pdev)
204 put_device(&pdev->dev);
206 EXPORT_SYMBOL_GPL(platform_device_put);
208 static void platform_device_release(struct device *dev)
210 struct platform_object *pa = container_of(dev, struct platform_object,
213 of_device_node_put(&pa->pdev.dev);
214 kfree(pa->pdev.dev.platform_data);
215 kfree(pa->pdev.mfd_cell);
216 kfree(pa->pdev.resource);
217 kfree(pa->pdev.driver_override);
222 * platform_device_alloc - create a platform device
223 * @name: base name of the device we're adding
226 * Create a platform device object which can have other objects attached
227 * to it, and which will have attached objects freed when it is released.
229 struct platform_device *platform_device_alloc(const char *name, int id)
231 struct platform_object *pa;
233 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
235 strcpy(pa->name, name);
236 pa->pdev.name = pa->name;
238 device_initialize(&pa->pdev.dev);
239 pa->pdev.dev.release = platform_device_release;
240 arch_setup_pdev_archdata(&pa->pdev);
243 return pa ? &pa->pdev : NULL;
245 EXPORT_SYMBOL_GPL(platform_device_alloc);
248 * platform_device_add_resources - add resources to a platform device
249 * @pdev: platform device allocated by platform_device_alloc to add resources to
250 * @res: set of resources that needs to be allocated for the device
251 * @num: number of resources
253 * Add a copy of the resources to the platform device. The memory
254 * associated with the resources will be freed when the platform device is
257 int platform_device_add_resources(struct platform_device *pdev,
258 const struct resource *res, unsigned int num)
260 struct resource *r = NULL;
263 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
268 kfree(pdev->resource);
270 pdev->num_resources = num;
273 EXPORT_SYMBOL_GPL(platform_device_add_resources);
276 * platform_device_add_data - add platform-specific data to a platform device
277 * @pdev: platform device allocated by platform_device_alloc to add resources to
278 * @data: platform specific data for this platform device
279 * @size: size of platform specific data
281 * Add a copy of platform specific data to the platform device's
282 * platform_data pointer. The memory associated with the platform data
283 * will be freed when the platform device is released.
285 int platform_device_add_data(struct platform_device *pdev, const void *data,
291 d = kmemdup(data, size, GFP_KERNEL);
296 kfree(pdev->dev.platform_data);
297 pdev->dev.platform_data = d;
300 EXPORT_SYMBOL_GPL(platform_device_add_data);
303 * platform_device_add_properties - add built-in properties to a platform device
304 * @pdev: platform device to add properties to
305 * @pset: properties to add
307 * The function will take deep copy of the properties in @pset and attach
308 * the copy to the platform device. The memory associated with properties
309 * will be freed when the platform device is released.
311 int platform_device_add_properties(struct platform_device *pdev,
312 const struct property_set *pset)
314 return device_add_property_set(&pdev->dev, pset);
316 EXPORT_SYMBOL_GPL(platform_device_add_properties);
319 * platform_device_add - add a platform device to device hierarchy
320 * @pdev: platform device we're adding
322 * This is part 2 of platform_device_register(), though may be called
323 * separately _iff_ pdev was allocated by platform_device_alloc().
325 int platform_device_add(struct platform_device *pdev)
332 if (!pdev->dev.parent)
333 pdev->dev.parent = &platform_bus;
335 pdev->dev.bus = &platform_bus_type;
339 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
341 case PLATFORM_DEVID_NONE:
342 dev_set_name(&pdev->dev, "%s", pdev->name);
344 case PLATFORM_DEVID_AUTO:
346 * Automatically allocated device ID. We mark it as such so
347 * that we remember it must be freed, and we append a suffix
348 * to avoid namespace collision with explicit IDs.
350 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
354 pdev->id_auto = true;
355 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
359 for (i = 0; i < pdev->num_resources; i++) {
360 struct resource *p, *r = &pdev->resource[i];
363 r->name = dev_name(&pdev->dev);
367 if (resource_type(r) == IORESOURCE_MEM)
369 else if (resource_type(r) == IORESOURCE_IO)
370 p = &ioport_resource;
373 if (p && insert_resource(p, r)) {
374 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
380 pr_debug("Registering platform device '%s'. Parent at %s\n",
381 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
383 ret = device_add(&pdev->dev);
389 ida_simple_remove(&platform_devid_ida, pdev->id);
390 pdev->id = PLATFORM_DEVID_AUTO;
394 struct resource *r = &pdev->resource[i];
402 EXPORT_SYMBOL_GPL(platform_device_add);
405 * platform_device_del - remove a platform-level device
406 * @pdev: platform device we're removing
408 * Note that this function will also release all memory- and port-based
409 * resources owned by the device (@dev->resource). This function must
410 * _only_ be externally called in error cases. All other usage is a bug.
412 void platform_device_del(struct platform_device *pdev)
417 device_del(&pdev->dev);
420 ida_simple_remove(&platform_devid_ida, pdev->id);
421 pdev->id = PLATFORM_DEVID_AUTO;
424 for (i = 0; i < pdev->num_resources; i++) {
425 struct resource *r = &pdev->resource[i];
430 device_remove_property_set(&pdev->dev);
433 EXPORT_SYMBOL_GPL(platform_device_del);
436 * platform_device_register - add a platform-level device
437 * @pdev: platform device we're adding
439 int platform_device_register(struct platform_device *pdev)
441 device_initialize(&pdev->dev);
442 arch_setup_pdev_archdata(pdev);
443 return platform_device_add(pdev);
445 EXPORT_SYMBOL_GPL(platform_device_register);
448 * platform_device_unregister - unregister a platform-level device
449 * @pdev: platform device we're unregistering
451 * Unregistration is done in 2 steps. First we release all resources
452 * and remove it from the subsystem, then we drop reference count by
453 * calling platform_device_put().
455 void platform_device_unregister(struct platform_device *pdev)
457 platform_device_del(pdev);
458 platform_device_put(pdev);
460 EXPORT_SYMBOL_GPL(platform_device_unregister);
463 * platform_device_register_full - add a platform-level device with
464 * resources and platform-specific data
466 * @pdevinfo: data used to create device
468 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
470 struct platform_device *platform_device_register_full(
471 const struct platform_device_info *pdevinfo)
474 struct platform_device *pdev;
476 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
480 pdev->dev.parent = pdevinfo->parent;
481 pdev->dev.fwnode = pdevinfo->fwnode;
483 if (pdevinfo->dma_mask) {
485 * This memory isn't freed when the device is put,
486 * I don't have a nice idea for that though. Conceptually
487 * dma_mask in struct device should not be a pointer.
488 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
491 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
492 if (!pdev->dev.dma_mask)
495 *pdev->dev.dma_mask = pdevinfo->dma_mask;
496 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
499 ret = platform_device_add_resources(pdev,
500 pdevinfo->res, pdevinfo->num_res);
504 ret = platform_device_add_data(pdev,
505 pdevinfo->data, pdevinfo->size_data);
509 if (pdevinfo->pset) {
510 ret = platform_device_add_properties(pdev, pdevinfo->pset);
515 ret = platform_device_add(pdev);
518 ACPI_COMPANION_SET(&pdev->dev, NULL);
519 kfree(pdev->dev.dma_mask);
522 platform_device_put(pdev);
528 EXPORT_SYMBOL_GPL(platform_device_register_full);
530 static int platform_drv_probe(struct device *_dev)
532 struct platform_driver *drv = to_platform_driver(_dev->driver);
533 struct platform_device *dev = to_platform_device(_dev);
536 ret = of_clk_set_defaults(_dev->of_node, false);
540 ret = dev_pm_domain_attach(_dev, true);
541 if (ret != -EPROBE_DEFER && drv->probe) {
542 ret = drv->probe(dev);
544 dev_pm_domain_detach(_dev, true);
547 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
548 dev_warn(_dev, "probe deferral not supported\n");
555 static int platform_drv_probe_fail(struct device *_dev)
560 static int platform_drv_remove(struct device *_dev)
562 struct platform_driver *drv = to_platform_driver(_dev->driver);
563 struct platform_device *dev = to_platform_device(_dev);
567 ret = drv->remove(dev);
568 dev_pm_domain_detach(_dev, true);
573 static void platform_drv_shutdown(struct device *_dev)
575 struct platform_driver *drv = to_platform_driver(_dev->driver);
576 struct platform_device *dev = to_platform_device(_dev);
580 dev_pm_domain_detach(_dev, true);
584 * __platform_driver_register - register a driver for platform-level devices
585 * @drv: platform driver structure
586 * @owner: owning module/driver
588 int __platform_driver_register(struct platform_driver *drv,
589 struct module *owner)
591 drv->driver.owner = owner;
592 drv->driver.bus = &platform_bus_type;
593 drv->driver.probe = platform_drv_probe;
594 drv->driver.remove = platform_drv_remove;
595 drv->driver.shutdown = platform_drv_shutdown;
597 return driver_register(&drv->driver);
599 EXPORT_SYMBOL_GPL(__platform_driver_register);
602 * platform_driver_unregister - unregister a driver for platform-level devices
603 * @drv: platform driver structure
605 void platform_driver_unregister(struct platform_driver *drv)
607 driver_unregister(&drv->driver);
609 EXPORT_SYMBOL_GPL(platform_driver_unregister);
612 * __platform_driver_probe - register driver for non-hotpluggable device
613 * @drv: platform driver structure
614 * @probe: the driver probe routine, probably from an __init section
615 * @module: module which will be the owner of the driver
617 * Use this instead of platform_driver_register() when you know the device
618 * is not hotpluggable and has already been registered, and you want to
619 * remove its run-once probe() infrastructure from memory after the driver
620 * has bound to the device.
622 * One typical use for this would be with drivers for controllers integrated
623 * into system-on-chip processors, where the controller devices have been
624 * configured as part of board setup.
626 * Note that this is incompatible with deferred probing.
628 * Returns zero if the driver registered and bound to a device, else returns
629 * a negative error code and with the driver not registered.
631 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
632 int (*probe)(struct platform_device *), struct module *module)
636 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
637 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
638 drv->driver.name, __func__);
643 * We have to run our probes synchronously because we check if
644 * we find any devices to bind to and exit with error if there
647 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
650 * Prevent driver from requesting probe deferral to avoid further
651 * futile probe attempts.
653 drv->prevent_deferred_probe = true;
655 /* make sure driver won't have bind/unbind attributes */
656 drv->driver.suppress_bind_attrs = true;
658 /* temporary section violation during probe() */
660 retval = code = __platform_driver_register(drv, module);
663 * Fixup that section violation, being paranoid about code scanning
664 * the list of drivers in order to probe new devices. Check to see
665 * if the probe was successful, and make sure any forced probes of
668 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
670 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
672 drv->driver.probe = platform_drv_probe_fail;
673 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
676 platform_driver_unregister(drv);
679 EXPORT_SYMBOL_GPL(__platform_driver_probe);
682 * __platform_create_bundle - register driver and create corresponding device
683 * @driver: platform driver structure
684 * @probe: the driver probe routine, probably from an __init section
685 * @res: set of resources that needs to be allocated for the device
686 * @n_res: number of resources
687 * @data: platform specific data for this platform device
688 * @size: size of platform specific data
689 * @module: module which will be the owner of the driver
691 * Use this in legacy-style modules that probe hardware directly and
692 * register a single platform device and corresponding platform driver.
694 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
696 struct platform_device * __init_or_module __platform_create_bundle(
697 struct platform_driver *driver,
698 int (*probe)(struct platform_device *),
699 struct resource *res, unsigned int n_res,
700 const void *data, size_t size, struct module *module)
702 struct platform_device *pdev;
705 pdev = platform_device_alloc(driver->driver.name, -1);
711 error = platform_device_add_resources(pdev, res, n_res);
715 error = platform_device_add_data(pdev, data, size);
719 error = platform_device_add(pdev);
723 error = __platform_driver_probe(driver, probe, module);
730 platform_device_del(pdev);
732 platform_device_put(pdev);
734 return ERR_PTR(error);
736 EXPORT_SYMBOL_GPL(__platform_create_bundle);
739 * __platform_register_drivers - register an array of platform drivers
740 * @drivers: an array of drivers to register
741 * @count: the number of drivers to register
742 * @owner: module owning the drivers
744 * Registers platform drivers specified by an array. On failure to register a
745 * driver, all previously registered drivers will be unregistered. Callers of
746 * this API should use platform_unregister_drivers() to unregister drivers in
749 * Returns: 0 on success or a negative error code on failure.
751 int __platform_register_drivers(struct platform_driver * const *drivers,
752 unsigned int count, struct module *owner)
757 for (i = 0; i < count; i++) {
758 pr_debug("registering platform driver %ps\n", drivers[i]);
760 err = __platform_driver_register(drivers[i], owner);
762 pr_err("failed to register platform driver %ps: %d\n",
772 pr_debug("unregistering platform driver %ps\n", drivers[i]);
773 platform_driver_unregister(drivers[i]);
778 EXPORT_SYMBOL_GPL(__platform_register_drivers);
781 * platform_unregister_drivers - unregister an array of platform drivers
782 * @drivers: an array of drivers to unregister
783 * @count: the number of drivers to unregister
785 * Unegisters platform drivers specified by an array. This is typically used
786 * to complement an earlier call to platform_register_drivers(). Drivers are
787 * unregistered in the reverse order in which they were registered.
789 void platform_unregister_drivers(struct platform_driver * const *drivers,
793 pr_debug("unregistering platform driver %ps\n", drivers[count]);
794 platform_driver_unregister(drivers[count]);
797 EXPORT_SYMBOL_GPL(platform_unregister_drivers);
799 /* modalias support enables more hands-off userspace setup:
800 * (a) environment variable lets new-style hotplug events work once system is
801 * fully running: "modprobe $MODALIAS"
802 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
803 * mishandled before system is fully running: "modprobe $(cat modalias)"
805 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
808 struct platform_device *pdev = to_platform_device(dev);
811 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
815 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
819 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
821 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
823 static DEVICE_ATTR_RO(modalias);
825 static ssize_t driver_override_store(struct device *dev,
826 struct device_attribute *attr,
827 const char *buf, size_t count)
829 struct platform_device *pdev = to_platform_device(dev);
830 char *driver_override, *old = pdev->driver_override, *cp;
832 if (count > PATH_MAX)
835 driver_override = kstrndup(buf, count, GFP_KERNEL);
836 if (!driver_override)
839 cp = strchr(driver_override, '\n');
843 if (strlen(driver_override)) {
844 pdev->driver_override = driver_override;
846 kfree(driver_override);
847 pdev->driver_override = NULL;
855 static ssize_t driver_override_show(struct device *dev,
856 struct device_attribute *attr, char *buf)
858 struct platform_device *pdev = to_platform_device(dev);
860 return sprintf(buf, "%s\n", pdev->driver_override);
862 static DEVICE_ATTR_RW(driver_override);
865 static struct attribute *platform_dev_attrs[] = {
866 &dev_attr_modalias.attr,
867 &dev_attr_driver_override.attr,
870 ATTRIBUTE_GROUPS(platform_dev);
872 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
874 struct platform_device *pdev = to_platform_device(dev);
877 /* Some devices have extra OF data and an OF-style MODALIAS */
878 rc = of_device_uevent_modalias(dev, env);
882 rc = acpi_device_uevent_modalias(dev, env);
886 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
891 static const struct platform_device_id *platform_match_id(
892 const struct platform_device_id *id,
893 struct platform_device *pdev)
895 while (id->name[0]) {
896 if (strcmp(pdev->name, id->name) == 0) {
906 * platform_match - bind platform device to platform driver.
910 * Platform device IDs are assumed to be encoded like this:
911 * "<name><instance>", where <name> is a short description of the type of
912 * device, like "pci" or "floppy", and <instance> is the enumerated
913 * instance of the device, like '0' or '42'. Driver IDs are simply
914 * "<name>". So, extract the <name> from the platform_device structure,
915 * and compare it against the name of the driver. Return whether they match
918 static int platform_match(struct device *dev, struct device_driver *drv)
920 struct platform_device *pdev = to_platform_device(dev);
921 struct platform_driver *pdrv = to_platform_driver(drv);
923 /* When driver_override is set, only bind to the matching driver */
924 if (pdev->driver_override)
925 return !strcmp(pdev->driver_override, drv->name);
927 /* Attempt an OF style match first */
928 if (of_driver_match_device(dev, drv))
931 /* Then try ACPI style match */
932 if (acpi_driver_match_device(dev, drv))
935 /* Then try to match against the id table */
937 return platform_match_id(pdrv->id_table, pdev) != NULL;
939 /* fall-back to driver name match */
940 return (strcmp(pdev->name, drv->name) == 0);
943 #ifdef CONFIG_PM_SLEEP
945 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
947 struct platform_driver *pdrv = to_platform_driver(dev->driver);
948 struct platform_device *pdev = to_platform_device(dev);
951 if (dev->driver && pdrv->suspend)
952 ret = pdrv->suspend(pdev, mesg);
957 static int platform_legacy_resume(struct device *dev)
959 struct platform_driver *pdrv = to_platform_driver(dev->driver);
960 struct platform_device *pdev = to_platform_device(dev);
963 if (dev->driver && pdrv->resume)
964 ret = pdrv->resume(pdev);
969 #endif /* CONFIG_PM_SLEEP */
971 #ifdef CONFIG_SUSPEND
973 int platform_pm_suspend(struct device *dev)
975 struct device_driver *drv = dev->driver;
982 if (drv->pm->suspend)
983 ret = drv->pm->suspend(dev);
985 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
991 int platform_pm_resume(struct device *dev)
993 struct device_driver *drv = dev->driver;
1000 if (drv->pm->resume)
1001 ret = drv->pm->resume(dev);
1003 ret = platform_legacy_resume(dev);
1009 #endif /* CONFIG_SUSPEND */
1011 #ifdef CONFIG_HIBERNATE_CALLBACKS
1013 int platform_pm_freeze(struct device *dev)
1015 struct device_driver *drv = dev->driver;
1022 if (drv->pm->freeze)
1023 ret = drv->pm->freeze(dev);
1025 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1031 int platform_pm_thaw(struct device *dev)
1033 struct device_driver *drv = dev->driver;
1041 ret = drv->pm->thaw(dev);
1043 ret = platform_legacy_resume(dev);
1049 int platform_pm_poweroff(struct device *dev)
1051 struct device_driver *drv = dev->driver;
1058 if (drv->pm->poweroff)
1059 ret = drv->pm->poweroff(dev);
1061 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1067 int platform_pm_restore(struct device *dev)
1069 struct device_driver *drv = dev->driver;
1076 if (drv->pm->restore)
1077 ret = drv->pm->restore(dev);
1079 ret = platform_legacy_resume(dev);
1085 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1087 static const struct dev_pm_ops platform_dev_pm_ops = {
1088 .runtime_suspend = pm_generic_runtime_suspend,
1089 .runtime_resume = pm_generic_runtime_resume,
1090 USE_PLATFORM_PM_SLEEP_OPS
1093 struct bus_type platform_bus_type = {
1095 .dev_groups = platform_dev_groups,
1096 .match = platform_match,
1097 .uevent = platform_uevent,
1098 .pm = &platform_dev_pm_ops,
1100 EXPORT_SYMBOL_GPL(platform_bus_type);
1102 int __init platform_bus_init(void)
1106 early_platform_cleanup();
1108 error = device_register(&platform_bus);
1111 error = bus_register(&platform_bus_type);
1113 device_unregister(&platform_bus);
1114 of_platform_register_reconfig_notifier();
1118 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1119 u64 dma_get_required_mask(struct device *dev)
1121 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1122 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1125 if (!high_totalram) {
1126 /* convert to mask just covering totalram */
1127 low_totalram = (1 << (fls(low_totalram) - 1));
1128 low_totalram += low_totalram - 1;
1129 mask = low_totalram;
1131 high_totalram = (1 << (fls(high_totalram) - 1));
1132 high_totalram += high_totalram - 1;
1133 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1137 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1140 static __initdata LIST_HEAD(early_platform_driver_list);
1141 static __initdata LIST_HEAD(early_platform_device_list);
1144 * early_platform_driver_register - register early platform driver
1145 * @epdrv: early_platform driver structure
1146 * @buf: string passed from early_param()
1148 * Helper function for early_platform_init() / early_platform_init_buffer()
1150 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1156 /* Simply add the driver to the end of the global list.
1157 * Drivers will by default be put on the list in compiled-in order.
1159 if (!epdrv->list.next) {
1160 INIT_LIST_HEAD(&epdrv->list);
1161 list_add_tail(&epdrv->list, &early_platform_driver_list);
1164 /* If the user has specified device then make sure the driver
1165 * gets prioritized. The driver of the last device specified on
1166 * command line will be put first on the list.
1168 n = strlen(epdrv->pdrv->driver.name);
1169 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1170 list_move(&epdrv->list, &early_platform_driver_list);
1172 /* Allow passing parameters after device name */
1173 if (buf[n] == '\0' || buf[n] == ',')
1174 epdrv->requested_id = -1;
1176 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1179 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1180 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1183 n += strcspn(&buf[n + 1], ",") + 1;
1189 if (epdrv->bufsize) {
1190 memcpy(epdrv->buffer, &buf[n],
1191 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1192 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1200 * early_platform_add_devices - adds a number of early platform devices
1201 * @devs: array of early platform devices to add
1202 * @num: number of early platform devices in array
1204 * Used by early architecture code to register early platform devices and
1205 * their platform data.
1207 void __init early_platform_add_devices(struct platform_device **devs, int num)
1212 /* simply add the devices to list */
1213 for (i = 0; i < num; i++) {
1214 dev = &devs[i]->dev;
1216 if (!dev->devres_head.next) {
1217 pm_runtime_early_init(dev);
1218 INIT_LIST_HEAD(&dev->devres_head);
1219 list_add_tail(&dev->devres_head,
1220 &early_platform_device_list);
1226 * early_platform_driver_register_all - register early platform drivers
1227 * @class_str: string to identify early platform driver class
1229 * Used by architecture code to register all early platform drivers
1230 * for a certain class. If omitted then only early platform drivers
1231 * with matching kernel command line class parameters will be registered.
1233 void __init early_platform_driver_register_all(char *class_str)
1235 /* The "class_str" parameter may or may not be present on the kernel
1236 * command line. If it is present then there may be more than one
1237 * matching parameter.
1239 * Since we register our early platform drivers using early_param()
1240 * we need to make sure that they also get registered in the case
1241 * when the parameter is missing from the kernel command line.
1243 * We use parse_early_options() to make sure the early_param() gets
1244 * called at least once. The early_param() may be called more than
1245 * once since the name of the preferred device may be specified on
1246 * the kernel command line. early_platform_driver_register() handles
1249 parse_early_options(class_str);
1253 * early_platform_match - find early platform device matching driver
1254 * @epdrv: early platform driver structure
1255 * @id: id to match against
1257 static struct platform_device * __init
1258 early_platform_match(struct early_platform_driver *epdrv, int id)
1260 struct platform_device *pd;
1262 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1263 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1271 * early_platform_left - check if early platform driver has matching devices
1272 * @epdrv: early platform driver structure
1273 * @id: return true if id or above exists
1275 static int __init early_platform_left(struct early_platform_driver *epdrv,
1278 struct platform_device *pd;
1280 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1281 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1289 * early_platform_driver_probe_id - probe drivers matching class_str and id
1290 * @class_str: string to identify early platform driver class
1291 * @id: id to match against
1292 * @nr_probe: number of platform devices to successfully probe before exiting
1294 static int __init early_platform_driver_probe_id(char *class_str,
1298 struct early_platform_driver *epdrv;
1299 struct platform_device *match;
1304 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1305 /* only use drivers matching our class_str */
1306 if (strcmp(class_str, epdrv->class_str))
1310 match_id = epdrv->requested_id;
1315 left += early_platform_left(epdrv, id);
1317 /* skip requested id */
1318 switch (epdrv->requested_id) {
1319 case EARLY_PLATFORM_ID_ERROR:
1320 case EARLY_PLATFORM_ID_UNSET:
1323 if (epdrv->requested_id == id)
1324 match_id = EARLY_PLATFORM_ID_UNSET;
1329 case EARLY_PLATFORM_ID_ERROR:
1330 pr_warn("%s: unable to parse %s parameter\n",
1331 class_str, epdrv->pdrv->driver.name);
1333 case EARLY_PLATFORM_ID_UNSET:
1337 match = early_platform_match(epdrv, match_id);
1342 * Set up a sensible init_name to enable
1343 * dev_name() and others to be used before the
1344 * rest of the driver core is initialized.
1346 if (!match->dev.init_name && slab_is_available()) {
1347 if (match->id != -1)
1348 match->dev.init_name =
1349 kasprintf(GFP_KERNEL, "%s.%d",
1353 match->dev.init_name =
1354 kasprintf(GFP_KERNEL, "%s",
1357 if (!match->dev.init_name)
1361 if (epdrv->pdrv->probe(match))
1362 pr_warn("%s: unable to probe %s early.\n",
1363 class_str, match->name);
1379 * early_platform_driver_probe - probe a class of registered drivers
1380 * @class_str: string to identify early platform driver class
1381 * @nr_probe: number of platform devices to successfully probe before exiting
1382 * @user_only: only probe user specified early platform devices
1384 * Used by architecture code to probe registered early platform drivers
1385 * within a certain class. For probe to happen a registered early platform
1386 * device matching a registered early platform driver is needed.
1388 int __init early_platform_driver_probe(char *class_str,
1395 for (i = -2; n < nr_probe; i++) {
1396 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1411 * early_platform_cleanup - clean up early platform code
1413 void __init early_platform_cleanup(void)
1415 struct platform_device *pd, *pd2;
1417 /* clean up the devres list used to chain devices */
1418 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1420 list_del(&pd->dev.devres_head);
1421 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));