1 // SPDX-License-Identifier: GPL-2.0
3 * platform.c - platform 'pseudo' bus for legacy devices
5 * Copyright (c) 2002-3 Patrick Mochel
6 * Copyright (c) 2002-3 Open Source Development Labs
8 * This file is released under the GPLv2
10 * Please see Documentation/driver-model/platform.txt for more
14 #include <linux/string.h>
15 #include <linux/platform_device.h>
16 #include <linux/of_device.h>
17 #include <linux/of_irq.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/bootmem.h>
22 #include <linux/err.h>
23 #include <linux/slab.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/pm_domain.h>
26 #include <linux/idr.h>
27 #include <linux/acpi.h>
28 #include <linux/clk/clk-conf.h>
29 #include <linux/limits.h>
30 #include <linux/property.h>
33 #include "power/power.h"
35 /* For automatically allocated device IDs */
36 static DEFINE_IDA(platform_devid_ida);
38 struct device platform_bus = {
39 .init_name = "platform",
41 EXPORT_SYMBOL_GPL(platform_bus);
44 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
45 * @pdev: platform device
47 * This is called before platform_device_add() such that any pdev_archdata may
48 * be setup before the platform_notifier is called. So if a user needs to
49 * manipulate any relevant information in the pdev_archdata they can do:
51 * platform_device_alloc()
53 * platform_device_add()
55 * And if they don't care they can just call platform_device_register() and
56 * everything will just work out.
58 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
63 * platform_get_resource - get a resource for a device
64 * @dev: platform device
65 * @type: resource type
66 * @num: resource index
68 struct resource *platform_get_resource(struct platform_device *dev,
69 unsigned int type, unsigned int num)
73 for (i = 0; i < dev->num_resources; i++) {
74 struct resource *r = &dev->resource[i];
76 if (type == resource_type(r) && num-- == 0)
81 EXPORT_SYMBOL_GPL(platform_get_resource);
84 * platform_get_irq - get an IRQ for a device
85 * @dev: platform device
86 * @num: IRQ number index
88 int platform_get_irq(struct platform_device *dev, unsigned int num)
91 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
92 if (!dev || num >= dev->archdata.num_irqs)
94 return dev->archdata.irqs[num];
97 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
100 ret = of_irq_get(dev->dev.of_node, num);
101 if (ret > 0 || ret == -EPROBE_DEFER)
105 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
106 if (has_acpi_companion(&dev->dev)) {
107 if (r && r->flags & IORESOURCE_DISABLED) {
110 ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
117 * The resources may pass trigger flags to the irqs that need
118 * to be set up. It so happens that the trigger flags for
119 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
122 if (r && r->flags & IORESOURCE_BITS) {
123 struct irq_data *irqd;
125 irqd = irq_get_irq_data(r->start);
128 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
131 return r ? r->start : -ENXIO;
134 EXPORT_SYMBOL_GPL(platform_get_irq);
137 * platform_irq_count - Count the number of IRQs a platform device uses
138 * @dev: platform device
140 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
142 int platform_irq_count(struct platform_device *dev)
146 while ((ret = platform_get_irq(dev, nr)) >= 0)
149 if (ret == -EPROBE_DEFER)
154 EXPORT_SYMBOL_GPL(platform_irq_count);
157 * platform_get_resource_byname - get a resource for a device by name
158 * @dev: platform device
159 * @type: resource type
160 * @name: resource name
162 struct resource *platform_get_resource_byname(struct platform_device *dev,
168 for (i = 0; i < dev->num_resources; i++) {
169 struct resource *r = &dev->resource[i];
171 if (unlikely(!r->name))
174 if (type == resource_type(r) && !strcmp(r->name, name))
179 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
182 * platform_get_irq_byname - get an IRQ for a device by name
183 * @dev: platform device
186 int platform_get_irq_byname(struct platform_device *dev, const char *name)
190 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
193 ret = of_irq_get_byname(dev->dev.of_node, name);
194 if (ret > 0 || ret == -EPROBE_DEFER)
198 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
199 return r ? r->start : -ENXIO;
201 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
204 * platform_add_devices - add a numbers of platform devices
205 * @devs: array of platform devices to add
206 * @num: number of platform devices in array
208 int platform_add_devices(struct platform_device **devs, int num)
212 for (i = 0; i < num; i++) {
213 ret = platform_device_register(devs[i]);
216 platform_device_unregister(devs[i]);
223 EXPORT_SYMBOL_GPL(platform_add_devices);
225 struct platform_object {
226 struct platform_device pdev;
231 * platform_device_put - destroy a platform device
232 * @pdev: platform device to free
234 * Free all memory associated with a platform device. This function must
235 * _only_ be externally called in error cases. All other usage is a bug.
237 void platform_device_put(struct platform_device *pdev)
240 put_device(&pdev->dev);
242 EXPORT_SYMBOL_GPL(platform_device_put);
244 static void platform_device_release(struct device *dev)
246 struct platform_object *pa = container_of(dev, struct platform_object,
249 of_device_node_put(&pa->pdev.dev);
250 kfree(pa->pdev.dev.platform_data);
251 kfree(pa->pdev.mfd_cell);
252 kfree(pa->pdev.resource);
253 kfree(pa->pdev.driver_override);
258 * platform_device_alloc - create a platform device
259 * @name: base name of the device we're adding
262 * Create a platform device object which can have other objects attached
263 * to it, and which will have attached objects freed when it is released.
265 struct platform_device *platform_device_alloc(const char *name, int id)
267 struct platform_object *pa;
269 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
271 strcpy(pa->name, name);
272 pa->pdev.name = pa->name;
274 device_initialize(&pa->pdev.dev);
275 pa->pdev.dev.release = platform_device_release;
276 arch_setup_pdev_archdata(&pa->pdev);
279 return pa ? &pa->pdev : NULL;
281 EXPORT_SYMBOL_GPL(platform_device_alloc);
284 * platform_device_add_resources - add resources to a platform device
285 * @pdev: platform device allocated by platform_device_alloc to add resources to
286 * @res: set of resources that needs to be allocated for the device
287 * @num: number of resources
289 * Add a copy of the resources to the platform device. The memory
290 * associated with the resources will be freed when the platform device is
293 int platform_device_add_resources(struct platform_device *pdev,
294 const struct resource *res, unsigned int num)
296 struct resource *r = NULL;
299 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
304 kfree(pdev->resource);
306 pdev->num_resources = num;
309 EXPORT_SYMBOL_GPL(platform_device_add_resources);
312 * platform_device_add_data - add platform-specific data to a platform device
313 * @pdev: platform device allocated by platform_device_alloc to add resources to
314 * @data: platform specific data for this platform device
315 * @size: size of platform specific data
317 * Add a copy of platform specific data to the platform device's
318 * platform_data pointer. The memory associated with the platform data
319 * will be freed when the platform device is released.
321 int platform_device_add_data(struct platform_device *pdev, const void *data,
327 d = kmemdup(data, size, GFP_KERNEL);
332 kfree(pdev->dev.platform_data);
333 pdev->dev.platform_data = d;
336 EXPORT_SYMBOL_GPL(platform_device_add_data);
339 * platform_device_add_properties - add built-in properties to a platform device
340 * @pdev: platform device to add properties to
341 * @properties: null terminated array of properties to add
343 * The function will take deep copy of @properties and attach the copy to the
344 * platform device. The memory associated with properties will be freed when the
345 * platform device is released.
347 int platform_device_add_properties(struct platform_device *pdev,
348 const struct property_entry *properties)
350 return device_add_properties(&pdev->dev, properties);
352 EXPORT_SYMBOL_GPL(platform_device_add_properties);
355 * platform_device_add - add a platform device to device hierarchy
356 * @pdev: platform device we're adding
358 * This is part 2 of platform_device_register(), though may be called
359 * separately _iff_ pdev was allocated by platform_device_alloc().
361 int platform_device_add(struct platform_device *pdev)
368 if (!pdev->dev.parent)
369 pdev->dev.parent = &platform_bus;
371 pdev->dev.bus = &platform_bus_type;
375 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
377 case PLATFORM_DEVID_NONE:
378 dev_set_name(&pdev->dev, "%s", pdev->name);
380 case PLATFORM_DEVID_AUTO:
382 * Automatically allocated device ID. We mark it as such so
383 * that we remember it must be freed, and we append a suffix
384 * to avoid namespace collision with explicit IDs.
386 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
390 pdev->id_auto = true;
391 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
395 for (i = 0; i < pdev->num_resources; i++) {
396 struct resource *p, *r = &pdev->resource[i];
399 r->name = dev_name(&pdev->dev);
403 if (resource_type(r) == IORESOURCE_MEM)
405 else if (resource_type(r) == IORESOURCE_IO)
406 p = &ioport_resource;
409 if (p && insert_resource(p, r)) {
410 dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
416 pr_debug("Registering platform device '%s'. Parent at %s\n",
417 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
419 ret = device_add(&pdev->dev);
425 ida_simple_remove(&platform_devid_ida, pdev->id);
426 pdev->id = PLATFORM_DEVID_AUTO;
430 struct resource *r = &pdev->resource[i];
438 EXPORT_SYMBOL_GPL(platform_device_add);
441 * platform_device_del - remove a platform-level device
442 * @pdev: platform device we're removing
444 * Note that this function will also release all memory- and port-based
445 * resources owned by the device (@dev->resource). This function must
446 * _only_ be externally called in error cases. All other usage is a bug.
448 void platform_device_del(struct platform_device *pdev)
453 device_remove_properties(&pdev->dev);
454 device_del(&pdev->dev);
457 ida_simple_remove(&platform_devid_ida, pdev->id);
458 pdev->id = PLATFORM_DEVID_AUTO;
461 for (i = 0; i < pdev->num_resources; i++) {
462 struct resource *r = &pdev->resource[i];
468 EXPORT_SYMBOL_GPL(platform_device_del);
471 * platform_device_register - add a platform-level device
472 * @pdev: platform device we're adding
474 int platform_device_register(struct platform_device *pdev)
476 device_initialize(&pdev->dev);
477 arch_setup_pdev_archdata(pdev);
478 return platform_device_add(pdev);
480 EXPORT_SYMBOL_GPL(platform_device_register);
483 * platform_device_unregister - unregister a platform-level device
484 * @pdev: platform device we're unregistering
486 * Unregistration is done in 2 steps. First we release all resources
487 * and remove it from the subsystem, then we drop reference count by
488 * calling platform_device_put().
490 void platform_device_unregister(struct platform_device *pdev)
492 platform_device_del(pdev);
493 platform_device_put(pdev);
495 EXPORT_SYMBOL_GPL(platform_device_unregister);
498 * platform_device_register_full - add a platform-level device with
499 * resources and platform-specific data
501 * @pdevinfo: data used to create device
503 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
505 struct platform_device *platform_device_register_full(
506 const struct platform_device_info *pdevinfo)
509 struct platform_device *pdev;
511 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
515 pdev->dev.parent = pdevinfo->parent;
516 pdev->dev.fwnode = pdevinfo->fwnode;
518 if (pdevinfo->dma_mask) {
520 * This memory isn't freed when the device is put,
521 * I don't have a nice idea for that though. Conceptually
522 * dma_mask in struct device should not be a pointer.
523 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
526 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
527 if (!pdev->dev.dma_mask)
530 *pdev->dev.dma_mask = pdevinfo->dma_mask;
531 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
534 ret = platform_device_add_resources(pdev,
535 pdevinfo->res, pdevinfo->num_res);
539 ret = platform_device_add_data(pdev,
540 pdevinfo->data, pdevinfo->size_data);
544 if (pdevinfo->properties) {
545 ret = platform_device_add_properties(pdev,
546 pdevinfo->properties);
551 ret = platform_device_add(pdev);
554 ACPI_COMPANION_SET(&pdev->dev, NULL);
555 kfree(pdev->dev.dma_mask);
558 platform_device_put(pdev);
564 EXPORT_SYMBOL_GPL(platform_device_register_full);
566 static int platform_drv_probe(struct device *_dev)
568 struct platform_driver *drv = to_platform_driver(_dev->driver);
569 struct platform_device *dev = to_platform_device(_dev);
572 ret = of_clk_set_defaults(_dev->of_node, false);
576 ret = dev_pm_domain_attach(_dev, true);
577 if (ret != -EPROBE_DEFER) {
579 ret = drv->probe(dev);
581 dev_pm_domain_detach(_dev, true);
583 /* don't fail if just dev_pm_domain_attach failed */
588 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
589 dev_warn(_dev, "probe deferral not supported\n");
596 static int platform_drv_probe_fail(struct device *_dev)
601 static int platform_drv_remove(struct device *_dev)
603 struct platform_driver *drv = to_platform_driver(_dev->driver);
604 struct platform_device *dev = to_platform_device(_dev);
608 ret = drv->remove(dev);
609 dev_pm_domain_detach(_dev, true);
614 static void platform_drv_shutdown(struct device *_dev)
616 struct platform_driver *drv = to_platform_driver(_dev->driver);
617 struct platform_device *dev = to_platform_device(_dev);
624 * __platform_driver_register - register a driver for platform-level devices
625 * @drv: platform driver structure
626 * @owner: owning module/driver
628 int __platform_driver_register(struct platform_driver *drv,
629 struct module *owner)
631 drv->driver.owner = owner;
632 drv->driver.bus = &platform_bus_type;
633 drv->driver.probe = platform_drv_probe;
634 drv->driver.remove = platform_drv_remove;
635 drv->driver.shutdown = platform_drv_shutdown;
637 return driver_register(&drv->driver);
639 EXPORT_SYMBOL_GPL(__platform_driver_register);
642 * platform_driver_unregister - unregister a driver for platform-level devices
643 * @drv: platform driver structure
645 void platform_driver_unregister(struct platform_driver *drv)
647 driver_unregister(&drv->driver);
649 EXPORT_SYMBOL_GPL(platform_driver_unregister);
652 * __platform_driver_probe - register driver for non-hotpluggable device
653 * @drv: platform driver structure
654 * @probe: the driver probe routine, probably from an __init section
655 * @module: module which will be the owner of the driver
657 * Use this instead of platform_driver_register() when you know the device
658 * is not hotpluggable and has already been registered, and you want to
659 * remove its run-once probe() infrastructure from memory after the driver
660 * has bound to the device.
662 * One typical use for this would be with drivers for controllers integrated
663 * into system-on-chip processors, where the controller devices have been
664 * configured as part of board setup.
666 * Note that this is incompatible with deferred probing.
668 * Returns zero if the driver registered and bound to a device, else returns
669 * a negative error code and with the driver not registered.
671 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
672 int (*probe)(struct platform_device *), struct module *module)
676 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
677 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
678 drv->driver.name, __func__);
683 * We have to run our probes synchronously because we check if
684 * we find any devices to bind to and exit with error if there
687 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
690 * Prevent driver from requesting probe deferral to avoid further
691 * futile probe attempts.
693 drv->prevent_deferred_probe = true;
695 /* make sure driver won't have bind/unbind attributes */
696 drv->driver.suppress_bind_attrs = true;
698 /* temporary section violation during probe() */
700 retval = code = __platform_driver_register(drv, module);
703 * Fixup that section violation, being paranoid about code scanning
704 * the list of drivers in order to probe new devices. Check to see
705 * if the probe was successful, and make sure any forced probes of
708 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
710 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
712 drv->driver.probe = platform_drv_probe_fail;
713 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
716 platform_driver_unregister(drv);
719 EXPORT_SYMBOL_GPL(__platform_driver_probe);
722 * __platform_create_bundle - register driver and create corresponding device
723 * @driver: platform driver structure
724 * @probe: the driver probe routine, probably from an __init section
725 * @res: set of resources that needs to be allocated for the device
726 * @n_res: number of resources
727 * @data: platform specific data for this platform device
728 * @size: size of platform specific data
729 * @module: module which will be the owner of the driver
731 * Use this in legacy-style modules that probe hardware directly and
732 * register a single platform device and corresponding platform driver.
734 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
736 struct platform_device * __init_or_module __platform_create_bundle(
737 struct platform_driver *driver,
738 int (*probe)(struct platform_device *),
739 struct resource *res, unsigned int n_res,
740 const void *data, size_t size, struct module *module)
742 struct platform_device *pdev;
745 pdev = platform_device_alloc(driver->driver.name, -1);
751 error = platform_device_add_resources(pdev, res, n_res);
755 error = platform_device_add_data(pdev, data, size);
759 error = platform_device_add(pdev);
763 error = __platform_driver_probe(driver, probe, module);
770 platform_device_del(pdev);
772 platform_device_put(pdev);
774 return ERR_PTR(error);
776 EXPORT_SYMBOL_GPL(__platform_create_bundle);
779 * __platform_register_drivers - register an array of platform drivers
780 * @drivers: an array of drivers to register
781 * @count: the number of drivers to register
782 * @owner: module owning the drivers
784 * Registers platform drivers specified by an array. On failure to register a
785 * driver, all previously registered drivers will be unregistered. Callers of
786 * this API should use platform_unregister_drivers() to unregister drivers in
789 * Returns: 0 on success or a negative error code on failure.
791 int __platform_register_drivers(struct platform_driver * const *drivers,
792 unsigned int count, struct module *owner)
797 for (i = 0; i < count; i++) {
798 pr_debug("registering platform driver %ps\n", drivers[i]);
800 err = __platform_driver_register(drivers[i], owner);
802 pr_err("failed to register platform driver %ps: %d\n",
812 pr_debug("unregistering platform driver %ps\n", drivers[i]);
813 platform_driver_unregister(drivers[i]);
818 EXPORT_SYMBOL_GPL(__platform_register_drivers);
821 * platform_unregister_drivers - unregister an array of platform drivers
822 * @drivers: an array of drivers to unregister
823 * @count: the number of drivers to unregister
825 * Unegisters platform drivers specified by an array. This is typically used
826 * to complement an earlier call to platform_register_drivers(). Drivers are
827 * unregistered in the reverse order in which they were registered.
829 void platform_unregister_drivers(struct platform_driver * const *drivers,
833 pr_debug("unregistering platform driver %ps\n", drivers[count]);
834 platform_driver_unregister(drivers[count]);
837 EXPORT_SYMBOL_GPL(platform_unregister_drivers);
839 /* modalias support enables more hands-off userspace setup:
840 * (a) environment variable lets new-style hotplug events work once system is
841 * fully running: "modprobe $MODALIAS"
842 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
843 * mishandled before system is fully running: "modprobe $(cat modalias)"
845 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
848 struct platform_device *pdev = to_platform_device(dev);
851 len = of_device_modalias(dev, buf, PAGE_SIZE);
855 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
859 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
861 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
863 static DEVICE_ATTR_RO(modalias);
865 static ssize_t driver_override_store(struct device *dev,
866 struct device_attribute *attr,
867 const char *buf, size_t count)
869 struct platform_device *pdev = to_platform_device(dev);
870 char *driver_override, *old, *cp;
872 /* We need to keep extra room for a newline */
873 if (count >= (PAGE_SIZE - 1))
876 driver_override = kstrndup(buf, count, GFP_KERNEL);
877 if (!driver_override)
880 cp = strchr(driver_override, '\n');
885 old = pdev->driver_override;
886 if (strlen(driver_override)) {
887 pdev->driver_override = driver_override;
889 kfree(driver_override);
890 pdev->driver_override = NULL;
899 static ssize_t driver_override_show(struct device *dev,
900 struct device_attribute *attr, char *buf)
902 struct platform_device *pdev = to_platform_device(dev);
906 len = sprintf(buf, "%s\n", pdev->driver_override);
910 static DEVICE_ATTR_RW(driver_override);
913 static struct attribute *platform_dev_attrs[] = {
914 &dev_attr_modalias.attr,
915 &dev_attr_driver_override.attr,
918 ATTRIBUTE_GROUPS(platform_dev);
920 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
922 struct platform_device *pdev = to_platform_device(dev);
925 /* Some devices have extra OF data and an OF-style MODALIAS */
926 rc = of_device_uevent_modalias(dev, env);
930 rc = acpi_device_uevent_modalias(dev, env);
934 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
939 static const struct platform_device_id *platform_match_id(
940 const struct platform_device_id *id,
941 struct platform_device *pdev)
943 while (id->name[0]) {
944 if (strcmp(pdev->name, id->name) == 0) {
954 * platform_match - bind platform device to platform driver.
958 * Platform device IDs are assumed to be encoded like this:
959 * "<name><instance>", where <name> is a short description of the type of
960 * device, like "pci" or "floppy", and <instance> is the enumerated
961 * instance of the device, like '0' or '42'. Driver IDs are simply
962 * "<name>". So, extract the <name> from the platform_device structure,
963 * and compare it against the name of the driver. Return whether they match
966 static int platform_match(struct device *dev, struct device_driver *drv)
968 struct platform_device *pdev = to_platform_device(dev);
969 struct platform_driver *pdrv = to_platform_driver(drv);
971 /* When driver_override is set, only bind to the matching driver */
972 if (pdev->driver_override)
973 return !strcmp(pdev->driver_override, drv->name);
975 /* Attempt an OF style match first */
976 if (of_driver_match_device(dev, drv))
979 /* Then try ACPI style match */
980 if (acpi_driver_match_device(dev, drv))
983 /* Then try to match against the id table */
985 return platform_match_id(pdrv->id_table, pdev) != NULL;
987 /* fall-back to driver name match */
988 return (strcmp(pdev->name, drv->name) == 0);
991 #ifdef CONFIG_PM_SLEEP
993 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
995 struct platform_driver *pdrv = to_platform_driver(dev->driver);
996 struct platform_device *pdev = to_platform_device(dev);
999 if (dev->driver && pdrv->suspend)
1000 ret = pdrv->suspend(pdev, mesg);
1005 static int platform_legacy_resume(struct device *dev)
1007 struct platform_driver *pdrv = to_platform_driver(dev->driver);
1008 struct platform_device *pdev = to_platform_device(dev);
1011 if (dev->driver && pdrv->resume)
1012 ret = pdrv->resume(pdev);
1017 #endif /* CONFIG_PM_SLEEP */
1019 #ifdef CONFIG_SUSPEND
1021 int platform_pm_suspend(struct device *dev)
1023 struct device_driver *drv = dev->driver;
1030 if (drv->pm->suspend)
1031 ret = drv->pm->suspend(dev);
1033 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1039 int platform_pm_resume(struct device *dev)
1041 struct device_driver *drv = dev->driver;
1048 if (drv->pm->resume)
1049 ret = drv->pm->resume(dev);
1051 ret = platform_legacy_resume(dev);
1057 #endif /* CONFIG_SUSPEND */
1059 #ifdef CONFIG_HIBERNATE_CALLBACKS
1061 int platform_pm_freeze(struct device *dev)
1063 struct device_driver *drv = dev->driver;
1070 if (drv->pm->freeze)
1071 ret = drv->pm->freeze(dev);
1073 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1079 int platform_pm_thaw(struct device *dev)
1081 struct device_driver *drv = dev->driver;
1089 ret = drv->pm->thaw(dev);
1091 ret = platform_legacy_resume(dev);
1097 int platform_pm_poweroff(struct device *dev)
1099 struct device_driver *drv = dev->driver;
1106 if (drv->pm->poweroff)
1107 ret = drv->pm->poweroff(dev);
1109 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1115 int platform_pm_restore(struct device *dev)
1117 struct device_driver *drv = dev->driver;
1124 if (drv->pm->restore)
1125 ret = drv->pm->restore(dev);
1127 ret = platform_legacy_resume(dev);
1133 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1135 static const struct dev_pm_ops platform_dev_pm_ops = {
1136 .runtime_suspend = pm_generic_runtime_suspend,
1137 .runtime_resume = pm_generic_runtime_resume,
1138 USE_PLATFORM_PM_SLEEP_OPS
1141 struct bus_type platform_bus_type = {
1143 .dev_groups = platform_dev_groups,
1144 .match = platform_match,
1145 .uevent = platform_uevent,
1146 .pm = &platform_dev_pm_ops,
1149 EXPORT_SYMBOL_GPL(platform_bus_type);
1151 int __init platform_bus_init(void)
1155 early_platform_cleanup();
1157 error = device_register(&platform_bus);
1160 error = bus_register(&platform_bus_type);
1162 device_unregister(&platform_bus);
1163 of_platform_register_reconfig_notifier();
1167 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1168 u64 dma_get_required_mask(struct device *dev)
1170 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1171 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1174 if (!high_totalram) {
1175 /* convert to mask just covering totalram */
1176 low_totalram = (1 << (fls(low_totalram) - 1));
1177 low_totalram += low_totalram - 1;
1178 mask = low_totalram;
1180 high_totalram = (1 << (fls(high_totalram) - 1));
1181 high_totalram += high_totalram - 1;
1182 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1186 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1189 static __initdata LIST_HEAD(early_platform_driver_list);
1190 static __initdata LIST_HEAD(early_platform_device_list);
1193 * early_platform_driver_register - register early platform driver
1194 * @epdrv: early_platform driver structure
1195 * @buf: string passed from early_param()
1197 * Helper function for early_platform_init() / early_platform_init_buffer()
1199 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1205 /* Simply add the driver to the end of the global list.
1206 * Drivers will by default be put on the list in compiled-in order.
1208 if (!epdrv->list.next) {
1209 INIT_LIST_HEAD(&epdrv->list);
1210 list_add_tail(&epdrv->list, &early_platform_driver_list);
1213 /* If the user has specified device then make sure the driver
1214 * gets prioritized. The driver of the last device specified on
1215 * command line will be put first on the list.
1217 n = strlen(epdrv->pdrv->driver.name);
1218 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1219 list_move(&epdrv->list, &early_platform_driver_list);
1221 /* Allow passing parameters after device name */
1222 if (buf[n] == '\0' || buf[n] == ',')
1223 epdrv->requested_id = -1;
1225 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1228 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1229 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1232 n += strcspn(&buf[n + 1], ",") + 1;
1238 if (epdrv->bufsize) {
1239 memcpy(epdrv->buffer, &buf[n],
1240 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1241 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1249 * early_platform_add_devices - adds a number of early platform devices
1250 * @devs: array of early platform devices to add
1251 * @num: number of early platform devices in array
1253 * Used by early architecture code to register early platform devices and
1254 * their platform data.
1256 void __init early_platform_add_devices(struct platform_device **devs, int num)
1261 /* simply add the devices to list */
1262 for (i = 0; i < num; i++) {
1263 dev = &devs[i]->dev;
1265 if (!dev->devres_head.next) {
1266 pm_runtime_early_init(dev);
1267 INIT_LIST_HEAD(&dev->devres_head);
1268 list_add_tail(&dev->devres_head,
1269 &early_platform_device_list);
1275 * early_platform_driver_register_all - register early platform drivers
1276 * @class_str: string to identify early platform driver class
1278 * Used by architecture code to register all early platform drivers
1279 * for a certain class. If omitted then only early platform drivers
1280 * with matching kernel command line class parameters will be registered.
1282 void __init early_platform_driver_register_all(char *class_str)
1284 /* The "class_str" parameter may or may not be present on the kernel
1285 * command line. If it is present then there may be more than one
1286 * matching parameter.
1288 * Since we register our early platform drivers using early_param()
1289 * we need to make sure that they also get registered in the case
1290 * when the parameter is missing from the kernel command line.
1292 * We use parse_early_options() to make sure the early_param() gets
1293 * called at least once. The early_param() may be called more than
1294 * once since the name of the preferred device may be specified on
1295 * the kernel command line. early_platform_driver_register() handles
1298 parse_early_options(class_str);
1302 * early_platform_match - find early platform device matching driver
1303 * @epdrv: early platform driver structure
1304 * @id: id to match against
1306 static struct platform_device * __init
1307 early_platform_match(struct early_platform_driver *epdrv, int id)
1309 struct platform_device *pd;
1311 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1312 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1320 * early_platform_left - check if early platform driver has matching devices
1321 * @epdrv: early platform driver structure
1322 * @id: return true if id or above exists
1324 static int __init early_platform_left(struct early_platform_driver *epdrv,
1327 struct platform_device *pd;
1329 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1330 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1338 * early_platform_driver_probe_id - probe drivers matching class_str and id
1339 * @class_str: string to identify early platform driver class
1340 * @id: id to match against
1341 * @nr_probe: number of platform devices to successfully probe before exiting
1343 static int __init early_platform_driver_probe_id(char *class_str,
1347 struct early_platform_driver *epdrv;
1348 struct platform_device *match;
1353 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1354 /* only use drivers matching our class_str */
1355 if (strcmp(class_str, epdrv->class_str))
1359 match_id = epdrv->requested_id;
1364 left += early_platform_left(epdrv, id);
1366 /* skip requested id */
1367 switch (epdrv->requested_id) {
1368 case EARLY_PLATFORM_ID_ERROR:
1369 case EARLY_PLATFORM_ID_UNSET:
1372 if (epdrv->requested_id == id)
1373 match_id = EARLY_PLATFORM_ID_UNSET;
1378 case EARLY_PLATFORM_ID_ERROR:
1379 pr_warn("%s: unable to parse %s parameter\n",
1380 class_str, epdrv->pdrv->driver.name);
1382 case EARLY_PLATFORM_ID_UNSET:
1386 match = early_platform_match(epdrv, match_id);
1391 * Set up a sensible init_name to enable
1392 * dev_name() and others to be used before the
1393 * rest of the driver core is initialized.
1395 if (!match->dev.init_name && slab_is_available()) {
1396 if (match->id != -1)
1397 match->dev.init_name =
1398 kasprintf(GFP_KERNEL, "%s.%d",
1402 match->dev.init_name =
1403 kasprintf(GFP_KERNEL, "%s",
1406 if (!match->dev.init_name)
1410 if (epdrv->pdrv->probe(match))
1411 pr_warn("%s: unable to probe %s early.\n",
1412 class_str, match->name);
1428 * early_platform_driver_probe - probe a class of registered drivers
1429 * @class_str: string to identify early platform driver class
1430 * @nr_probe: number of platform devices to successfully probe before exiting
1431 * @user_only: only probe user specified early platform devices
1433 * Used by architecture code to probe registered early platform drivers
1434 * within a certain class. For probe to happen a registered early platform
1435 * device matching a registered early platform driver is needed.
1437 int __init early_platform_driver_probe(char *class_str,
1444 for (i = -2; n < nr_probe; i++) {
1445 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1460 * early_platform_cleanup - clean up early platform code
1462 void __init early_platform_cleanup(void)
1464 struct platform_device *pd, *pd2;
1466 /* clean up the devres list used to chain devices */
1467 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1469 list_del(&pd->dev.devres_head);
1470 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));