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_irq_count - Count the number of IRQs a platform device uses
122 * @dev: platform device
124 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
126 int platform_irq_count(struct platform_device *dev)
130 while ((ret = platform_get_irq(dev, nr)) >= 0)
133 if (ret == -EPROBE_DEFER)
138 EXPORT_SYMBOL_GPL(platform_irq_count);
141 * platform_get_resource_byname - get a resource for a device by name
142 * @dev: platform device
143 * @type: resource type
144 * @name: resource name
146 struct resource *platform_get_resource_byname(struct platform_device *dev,
152 for (i = 0; i < dev->num_resources; i++) {
153 struct resource *r = &dev->resource[i];
155 if (unlikely(!r->name))
158 if (type == resource_type(r) && !strcmp(r->name, name))
163 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
166 * platform_get_irq_byname - get an IRQ for a device by name
167 * @dev: platform device
170 int platform_get_irq_byname(struct platform_device *dev, const char *name)
174 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
177 ret = of_irq_get_byname(dev->dev.of_node, name);
178 if (ret >= 0 || ret == -EPROBE_DEFER)
182 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
183 return r ? r->start : -ENXIO;
185 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
188 * platform_add_devices - add a numbers of platform devices
189 * @devs: array of platform devices to add
190 * @num: number of platform devices in array
192 int platform_add_devices(struct platform_device **devs, int num)
196 for (i = 0; i < num; i++) {
197 ret = platform_device_register(devs[i]);
200 platform_device_unregister(devs[i]);
207 EXPORT_SYMBOL_GPL(platform_add_devices);
209 struct platform_object {
210 struct platform_device pdev;
215 * platform_device_put - destroy a platform device
216 * @pdev: platform device to free
218 * Free all memory associated with a platform device. This function must
219 * _only_ be externally called in error cases. All other usage is a bug.
221 void platform_device_put(struct platform_device *pdev)
224 put_device(&pdev->dev);
226 EXPORT_SYMBOL_GPL(platform_device_put);
228 static void platform_device_release(struct device *dev)
230 struct platform_object *pa = container_of(dev, struct platform_object,
233 of_device_node_put(&pa->pdev.dev);
234 kfree(pa->pdev.dev.platform_data);
235 kfree(pa->pdev.mfd_cell);
236 kfree(pa->pdev.resource);
237 kfree(pa->pdev.driver_override);
242 * platform_device_alloc - create a platform device
243 * @name: base name of the device we're adding
246 * Create a platform device object which can have other objects attached
247 * to it, and which will have attached objects freed when it is released.
249 struct platform_device *platform_device_alloc(const char *name, int id)
251 struct platform_object *pa;
253 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
255 strcpy(pa->name, name);
256 pa->pdev.name = pa->name;
258 device_initialize(&pa->pdev.dev);
259 pa->pdev.dev.release = platform_device_release;
260 arch_setup_pdev_archdata(&pa->pdev);
263 return pa ? &pa->pdev : NULL;
265 EXPORT_SYMBOL_GPL(platform_device_alloc);
268 * platform_device_add_resources - add resources to a platform device
269 * @pdev: platform device allocated by platform_device_alloc to add resources to
270 * @res: set of resources that needs to be allocated for the device
271 * @num: number of resources
273 * Add a copy of the resources to the platform device. The memory
274 * associated with the resources will be freed when the platform device is
277 int platform_device_add_resources(struct platform_device *pdev,
278 const struct resource *res, unsigned int num)
280 struct resource *r = NULL;
283 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
288 kfree(pdev->resource);
290 pdev->num_resources = num;
293 EXPORT_SYMBOL_GPL(platform_device_add_resources);
296 * platform_device_add_data - add platform-specific data to a platform device
297 * @pdev: platform device allocated by platform_device_alloc to add resources to
298 * @data: platform specific data for this platform device
299 * @size: size of platform specific data
301 * Add a copy of platform specific data to the platform device's
302 * platform_data pointer. The memory associated with the platform data
303 * will be freed when the platform device is released.
305 int platform_device_add_data(struct platform_device *pdev, const void *data,
311 d = kmemdup(data, size, GFP_KERNEL);
316 kfree(pdev->dev.platform_data);
317 pdev->dev.platform_data = d;
320 EXPORT_SYMBOL_GPL(platform_device_add_data);
323 * platform_device_add_properties - add built-in properties to a platform device
324 * @pdev: platform device to add properties to
325 * @pset: properties to add
327 * The function will take deep copy of the properties in @pset and attach
328 * the copy to the platform device. The memory associated with properties
329 * will be freed when the platform device is released.
331 int platform_device_add_properties(struct platform_device *pdev,
332 const struct property_set *pset)
334 return device_add_property_set(&pdev->dev, pset);
336 EXPORT_SYMBOL_GPL(platform_device_add_properties);
339 * platform_device_add - add a platform device to device hierarchy
340 * @pdev: platform device we're adding
342 * This is part 2 of platform_device_register(), though may be called
343 * separately _iff_ pdev was allocated by platform_device_alloc().
345 int platform_device_add(struct platform_device *pdev)
352 if (!pdev->dev.parent)
353 pdev->dev.parent = &platform_bus;
355 pdev->dev.bus = &platform_bus_type;
359 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
361 case PLATFORM_DEVID_NONE:
362 dev_set_name(&pdev->dev, "%s", pdev->name);
364 case PLATFORM_DEVID_AUTO:
366 * Automatically allocated device ID. We mark it as such so
367 * that we remember it must be freed, and we append a suffix
368 * to avoid namespace collision with explicit IDs.
370 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
374 pdev->id_auto = true;
375 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
379 for (i = 0; i < pdev->num_resources; i++) {
380 struct resource *p, *r = &pdev->resource[i];
383 r->name = dev_name(&pdev->dev);
387 if (resource_type(r) == IORESOURCE_MEM)
389 else if (resource_type(r) == IORESOURCE_IO)
390 p = &ioport_resource;
393 if (p && insert_resource(p, r)) {
394 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
400 pr_debug("Registering platform device '%s'. Parent at %s\n",
401 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
403 ret = device_add(&pdev->dev);
409 ida_simple_remove(&platform_devid_ida, pdev->id);
410 pdev->id = PLATFORM_DEVID_AUTO;
414 struct resource *r = &pdev->resource[i];
422 EXPORT_SYMBOL_GPL(platform_device_add);
425 * platform_device_del - remove a platform-level device
426 * @pdev: platform device we're removing
428 * Note that this function will also release all memory- and port-based
429 * resources owned by the device (@dev->resource). This function must
430 * _only_ be externally called in error cases. All other usage is a bug.
432 void platform_device_del(struct platform_device *pdev)
437 device_del(&pdev->dev);
440 ida_simple_remove(&platform_devid_ida, pdev->id);
441 pdev->id = PLATFORM_DEVID_AUTO;
444 for (i = 0; i < pdev->num_resources; i++) {
445 struct resource *r = &pdev->resource[i];
450 device_remove_property_set(&pdev->dev);
453 EXPORT_SYMBOL_GPL(platform_device_del);
456 * platform_device_register - add a platform-level device
457 * @pdev: platform device we're adding
459 int platform_device_register(struct platform_device *pdev)
461 device_initialize(&pdev->dev);
462 arch_setup_pdev_archdata(pdev);
463 return platform_device_add(pdev);
465 EXPORT_SYMBOL_GPL(platform_device_register);
468 * platform_device_unregister - unregister a platform-level device
469 * @pdev: platform device we're unregistering
471 * Unregistration is done in 2 steps. First we release all resources
472 * and remove it from the subsystem, then we drop reference count by
473 * calling platform_device_put().
475 void platform_device_unregister(struct platform_device *pdev)
477 platform_device_del(pdev);
478 platform_device_put(pdev);
480 EXPORT_SYMBOL_GPL(platform_device_unregister);
483 * platform_device_register_full - add a platform-level device with
484 * resources and platform-specific data
486 * @pdevinfo: data used to create device
488 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
490 struct platform_device *platform_device_register_full(
491 const struct platform_device_info *pdevinfo)
494 struct platform_device *pdev;
496 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
500 pdev->dev.parent = pdevinfo->parent;
501 pdev->dev.fwnode = pdevinfo->fwnode;
503 if (pdevinfo->dma_mask) {
505 * This memory isn't freed when the device is put,
506 * I don't have a nice idea for that though. Conceptually
507 * dma_mask in struct device should not be a pointer.
508 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
511 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
512 if (!pdev->dev.dma_mask)
515 *pdev->dev.dma_mask = pdevinfo->dma_mask;
516 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
519 ret = platform_device_add_resources(pdev,
520 pdevinfo->res, pdevinfo->num_res);
524 ret = platform_device_add_data(pdev,
525 pdevinfo->data, pdevinfo->size_data);
529 if (pdevinfo->pset) {
530 ret = platform_device_add_properties(pdev, pdevinfo->pset);
535 ret = platform_device_add(pdev);
538 ACPI_COMPANION_SET(&pdev->dev, NULL);
539 kfree(pdev->dev.dma_mask);
542 platform_device_put(pdev);
548 EXPORT_SYMBOL_GPL(platform_device_register_full);
550 static int platform_drv_probe(struct device *_dev)
552 struct platform_driver *drv = to_platform_driver(_dev->driver);
553 struct platform_device *dev = to_platform_device(_dev);
556 ret = of_clk_set_defaults(_dev->of_node, false);
560 ret = dev_pm_domain_attach(_dev, true);
561 if (ret != -EPROBE_DEFER && drv->probe) {
562 ret = drv->probe(dev);
564 dev_pm_domain_detach(_dev, true);
567 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
568 dev_warn(_dev, "probe deferral not supported\n");
575 static int platform_drv_probe_fail(struct device *_dev)
580 static int platform_drv_remove(struct device *_dev)
582 struct platform_driver *drv = to_platform_driver(_dev->driver);
583 struct platform_device *dev = to_platform_device(_dev);
587 ret = drv->remove(dev);
588 dev_pm_domain_detach(_dev, true);
593 static void platform_drv_shutdown(struct device *_dev)
595 struct platform_driver *drv = to_platform_driver(_dev->driver);
596 struct platform_device *dev = to_platform_device(_dev);
603 * __platform_driver_register - register a driver for platform-level devices
604 * @drv: platform driver structure
605 * @owner: owning module/driver
607 int __platform_driver_register(struct platform_driver *drv,
608 struct module *owner)
610 drv->driver.owner = owner;
611 drv->driver.bus = &platform_bus_type;
612 drv->driver.probe = platform_drv_probe;
613 drv->driver.remove = platform_drv_remove;
614 drv->driver.shutdown = platform_drv_shutdown;
616 return driver_register(&drv->driver);
618 EXPORT_SYMBOL_GPL(__platform_driver_register);
621 * platform_driver_unregister - unregister a driver for platform-level devices
622 * @drv: platform driver structure
624 void platform_driver_unregister(struct platform_driver *drv)
626 driver_unregister(&drv->driver);
628 EXPORT_SYMBOL_GPL(platform_driver_unregister);
631 * __platform_driver_probe - register driver for non-hotpluggable device
632 * @drv: platform driver structure
633 * @probe: the driver probe routine, probably from an __init section
634 * @module: module which will be the owner of the driver
636 * Use this instead of platform_driver_register() when you know the device
637 * is not hotpluggable and has already been registered, and you want to
638 * remove its run-once probe() infrastructure from memory after the driver
639 * has bound to the device.
641 * One typical use for this would be with drivers for controllers integrated
642 * into system-on-chip processors, where the controller devices have been
643 * configured as part of board setup.
645 * Note that this is incompatible with deferred probing.
647 * Returns zero if the driver registered and bound to a device, else returns
648 * a negative error code and with the driver not registered.
650 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
651 int (*probe)(struct platform_device *), struct module *module)
655 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
656 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
657 drv->driver.name, __func__);
662 * We have to run our probes synchronously because we check if
663 * we find any devices to bind to and exit with error if there
666 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
669 * Prevent driver from requesting probe deferral to avoid further
670 * futile probe attempts.
672 drv->prevent_deferred_probe = true;
674 /* make sure driver won't have bind/unbind attributes */
675 drv->driver.suppress_bind_attrs = true;
677 /* temporary section violation during probe() */
679 retval = code = __platform_driver_register(drv, module);
682 * Fixup that section violation, being paranoid about code scanning
683 * the list of drivers in order to probe new devices. Check to see
684 * if the probe was successful, and make sure any forced probes of
687 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
689 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
691 drv->driver.probe = platform_drv_probe_fail;
692 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
695 platform_driver_unregister(drv);
698 EXPORT_SYMBOL_GPL(__platform_driver_probe);
701 * __platform_create_bundle - register driver and create corresponding device
702 * @driver: platform driver structure
703 * @probe: the driver probe routine, probably from an __init section
704 * @res: set of resources that needs to be allocated for the device
705 * @n_res: number of resources
706 * @data: platform specific data for this platform device
707 * @size: size of platform specific data
708 * @module: module which will be the owner of the driver
710 * Use this in legacy-style modules that probe hardware directly and
711 * register a single platform device and corresponding platform driver.
713 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
715 struct platform_device * __init_or_module __platform_create_bundle(
716 struct platform_driver *driver,
717 int (*probe)(struct platform_device *),
718 struct resource *res, unsigned int n_res,
719 const void *data, size_t size, struct module *module)
721 struct platform_device *pdev;
724 pdev = platform_device_alloc(driver->driver.name, -1);
730 error = platform_device_add_resources(pdev, res, n_res);
734 error = platform_device_add_data(pdev, data, size);
738 error = platform_device_add(pdev);
742 error = __platform_driver_probe(driver, probe, module);
749 platform_device_del(pdev);
751 platform_device_put(pdev);
753 return ERR_PTR(error);
755 EXPORT_SYMBOL_GPL(__platform_create_bundle);
758 * __platform_register_drivers - register an array of platform drivers
759 * @drivers: an array of drivers to register
760 * @count: the number of drivers to register
761 * @owner: module owning the drivers
763 * Registers platform drivers specified by an array. On failure to register a
764 * driver, all previously registered drivers will be unregistered. Callers of
765 * this API should use platform_unregister_drivers() to unregister drivers in
768 * Returns: 0 on success or a negative error code on failure.
770 int __platform_register_drivers(struct platform_driver * const *drivers,
771 unsigned int count, struct module *owner)
776 for (i = 0; i < count; i++) {
777 pr_debug("registering platform driver %ps\n", drivers[i]);
779 err = __platform_driver_register(drivers[i], owner);
781 pr_err("failed to register platform driver %ps: %d\n",
791 pr_debug("unregistering platform driver %ps\n", drivers[i]);
792 platform_driver_unregister(drivers[i]);
797 EXPORT_SYMBOL_GPL(__platform_register_drivers);
800 * platform_unregister_drivers - unregister an array of platform drivers
801 * @drivers: an array of drivers to unregister
802 * @count: the number of drivers to unregister
804 * Unegisters platform drivers specified by an array. This is typically used
805 * to complement an earlier call to platform_register_drivers(). Drivers are
806 * unregistered in the reverse order in which they were registered.
808 void platform_unregister_drivers(struct platform_driver * const *drivers,
812 pr_debug("unregistering platform driver %ps\n", drivers[count]);
813 platform_driver_unregister(drivers[count]);
816 EXPORT_SYMBOL_GPL(platform_unregister_drivers);
818 /* modalias support enables more hands-off userspace setup:
819 * (a) environment variable lets new-style hotplug events work once system is
820 * fully running: "modprobe $MODALIAS"
821 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
822 * mishandled before system is fully running: "modprobe $(cat modalias)"
824 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
827 struct platform_device *pdev = to_platform_device(dev);
830 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
834 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
838 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
840 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
842 static DEVICE_ATTR_RO(modalias);
844 static ssize_t driver_override_store(struct device *dev,
845 struct device_attribute *attr,
846 const char *buf, size_t count)
848 struct platform_device *pdev = to_platform_device(dev);
849 char *driver_override, *old = pdev->driver_override, *cp;
851 if (count > PATH_MAX)
854 driver_override = kstrndup(buf, count, GFP_KERNEL);
855 if (!driver_override)
858 cp = strchr(driver_override, '\n');
862 if (strlen(driver_override)) {
863 pdev->driver_override = driver_override;
865 kfree(driver_override);
866 pdev->driver_override = NULL;
874 static ssize_t driver_override_show(struct device *dev,
875 struct device_attribute *attr, char *buf)
877 struct platform_device *pdev = to_platform_device(dev);
879 return sprintf(buf, "%s\n", pdev->driver_override);
881 static DEVICE_ATTR_RW(driver_override);
884 static struct attribute *platform_dev_attrs[] = {
885 &dev_attr_modalias.attr,
886 &dev_attr_driver_override.attr,
889 ATTRIBUTE_GROUPS(platform_dev);
891 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
893 struct platform_device *pdev = to_platform_device(dev);
896 /* Some devices have extra OF data and an OF-style MODALIAS */
897 rc = of_device_uevent_modalias(dev, env);
901 rc = acpi_device_uevent_modalias(dev, env);
905 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
910 static const struct platform_device_id *platform_match_id(
911 const struct platform_device_id *id,
912 struct platform_device *pdev)
914 while (id->name[0]) {
915 if (strcmp(pdev->name, id->name) == 0) {
925 * platform_match - bind platform device to platform driver.
929 * Platform device IDs are assumed to be encoded like this:
930 * "<name><instance>", where <name> is a short description of the type of
931 * device, like "pci" or "floppy", and <instance> is the enumerated
932 * instance of the device, like '0' or '42'. Driver IDs are simply
933 * "<name>". So, extract the <name> from the platform_device structure,
934 * and compare it against the name of the driver. Return whether they match
937 static int platform_match(struct device *dev, struct device_driver *drv)
939 struct platform_device *pdev = to_platform_device(dev);
940 struct platform_driver *pdrv = to_platform_driver(drv);
942 /* When driver_override is set, only bind to the matching driver */
943 if (pdev->driver_override)
944 return !strcmp(pdev->driver_override, drv->name);
946 /* Attempt an OF style match first */
947 if (of_driver_match_device(dev, drv))
950 /* Then try ACPI style match */
951 if (acpi_driver_match_device(dev, drv))
954 /* Then try to match against the id table */
956 return platform_match_id(pdrv->id_table, pdev) != NULL;
958 /* fall-back to driver name match */
959 return (strcmp(pdev->name, drv->name) == 0);
962 #ifdef CONFIG_PM_SLEEP
964 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
966 struct platform_driver *pdrv = to_platform_driver(dev->driver);
967 struct platform_device *pdev = to_platform_device(dev);
970 if (dev->driver && pdrv->suspend)
971 ret = pdrv->suspend(pdev, mesg);
976 static int platform_legacy_resume(struct device *dev)
978 struct platform_driver *pdrv = to_platform_driver(dev->driver);
979 struct platform_device *pdev = to_platform_device(dev);
982 if (dev->driver && pdrv->resume)
983 ret = pdrv->resume(pdev);
988 #endif /* CONFIG_PM_SLEEP */
990 #ifdef CONFIG_SUSPEND
992 int platform_pm_suspend(struct device *dev)
994 struct device_driver *drv = dev->driver;
1001 if (drv->pm->suspend)
1002 ret = drv->pm->suspend(dev);
1004 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1010 int platform_pm_resume(struct device *dev)
1012 struct device_driver *drv = dev->driver;
1019 if (drv->pm->resume)
1020 ret = drv->pm->resume(dev);
1022 ret = platform_legacy_resume(dev);
1028 #endif /* CONFIG_SUSPEND */
1030 #ifdef CONFIG_HIBERNATE_CALLBACKS
1032 int platform_pm_freeze(struct device *dev)
1034 struct device_driver *drv = dev->driver;
1041 if (drv->pm->freeze)
1042 ret = drv->pm->freeze(dev);
1044 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1050 int platform_pm_thaw(struct device *dev)
1052 struct device_driver *drv = dev->driver;
1060 ret = drv->pm->thaw(dev);
1062 ret = platform_legacy_resume(dev);
1068 int platform_pm_poweroff(struct device *dev)
1070 struct device_driver *drv = dev->driver;
1077 if (drv->pm->poweroff)
1078 ret = drv->pm->poweroff(dev);
1080 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1086 int platform_pm_restore(struct device *dev)
1088 struct device_driver *drv = dev->driver;
1095 if (drv->pm->restore)
1096 ret = drv->pm->restore(dev);
1098 ret = platform_legacy_resume(dev);
1104 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1106 static const struct dev_pm_ops platform_dev_pm_ops = {
1107 .runtime_suspend = pm_generic_runtime_suspend,
1108 .runtime_resume = pm_generic_runtime_resume,
1109 USE_PLATFORM_PM_SLEEP_OPS
1112 struct bus_type platform_bus_type = {
1114 .dev_groups = platform_dev_groups,
1115 .match = platform_match,
1116 .uevent = platform_uevent,
1117 .pm = &platform_dev_pm_ops,
1119 EXPORT_SYMBOL_GPL(platform_bus_type);
1121 int __init platform_bus_init(void)
1125 early_platform_cleanup();
1127 error = device_register(&platform_bus);
1130 error = bus_register(&platform_bus_type);
1132 device_unregister(&platform_bus);
1133 of_platform_register_reconfig_notifier();
1137 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1138 u64 dma_get_required_mask(struct device *dev)
1140 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1141 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1144 if (!high_totalram) {
1145 /* convert to mask just covering totalram */
1146 low_totalram = (1 << (fls(low_totalram) - 1));
1147 low_totalram += low_totalram - 1;
1148 mask = low_totalram;
1150 high_totalram = (1 << (fls(high_totalram) - 1));
1151 high_totalram += high_totalram - 1;
1152 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1156 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1159 static __initdata LIST_HEAD(early_platform_driver_list);
1160 static __initdata LIST_HEAD(early_platform_device_list);
1163 * early_platform_driver_register - register early platform driver
1164 * @epdrv: early_platform driver structure
1165 * @buf: string passed from early_param()
1167 * Helper function for early_platform_init() / early_platform_init_buffer()
1169 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1175 /* Simply add the driver to the end of the global list.
1176 * Drivers will by default be put on the list in compiled-in order.
1178 if (!epdrv->list.next) {
1179 INIT_LIST_HEAD(&epdrv->list);
1180 list_add_tail(&epdrv->list, &early_platform_driver_list);
1183 /* If the user has specified device then make sure the driver
1184 * gets prioritized. The driver of the last device specified on
1185 * command line will be put first on the list.
1187 n = strlen(epdrv->pdrv->driver.name);
1188 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1189 list_move(&epdrv->list, &early_platform_driver_list);
1191 /* Allow passing parameters after device name */
1192 if (buf[n] == '\0' || buf[n] == ',')
1193 epdrv->requested_id = -1;
1195 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1198 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1199 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1202 n += strcspn(&buf[n + 1], ",") + 1;
1208 if (epdrv->bufsize) {
1209 memcpy(epdrv->buffer, &buf[n],
1210 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1211 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1219 * early_platform_add_devices - adds a number of early platform devices
1220 * @devs: array of early platform devices to add
1221 * @num: number of early platform devices in array
1223 * Used by early architecture code to register early platform devices and
1224 * their platform data.
1226 void __init early_platform_add_devices(struct platform_device **devs, int num)
1231 /* simply add the devices to list */
1232 for (i = 0; i < num; i++) {
1233 dev = &devs[i]->dev;
1235 if (!dev->devres_head.next) {
1236 pm_runtime_early_init(dev);
1237 INIT_LIST_HEAD(&dev->devres_head);
1238 list_add_tail(&dev->devres_head,
1239 &early_platform_device_list);
1245 * early_platform_driver_register_all - register early platform drivers
1246 * @class_str: string to identify early platform driver class
1248 * Used by architecture code to register all early platform drivers
1249 * for a certain class. If omitted then only early platform drivers
1250 * with matching kernel command line class parameters will be registered.
1252 void __init early_platform_driver_register_all(char *class_str)
1254 /* The "class_str" parameter may or may not be present on the kernel
1255 * command line. If it is present then there may be more than one
1256 * matching parameter.
1258 * Since we register our early platform drivers using early_param()
1259 * we need to make sure that they also get registered in the case
1260 * when the parameter is missing from the kernel command line.
1262 * We use parse_early_options() to make sure the early_param() gets
1263 * called at least once. The early_param() may be called more than
1264 * once since the name of the preferred device may be specified on
1265 * the kernel command line. early_platform_driver_register() handles
1268 parse_early_options(class_str);
1272 * early_platform_match - find early platform device matching driver
1273 * @epdrv: early platform driver structure
1274 * @id: id to match against
1276 static struct platform_device * __init
1277 early_platform_match(struct early_platform_driver *epdrv, int id)
1279 struct platform_device *pd;
1281 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1282 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1290 * early_platform_left - check if early platform driver has matching devices
1291 * @epdrv: early platform driver structure
1292 * @id: return true if id or above exists
1294 static int __init early_platform_left(struct early_platform_driver *epdrv,
1297 struct platform_device *pd;
1299 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1300 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1308 * early_platform_driver_probe_id - probe drivers matching class_str and id
1309 * @class_str: string to identify early platform driver class
1310 * @id: id to match against
1311 * @nr_probe: number of platform devices to successfully probe before exiting
1313 static int __init early_platform_driver_probe_id(char *class_str,
1317 struct early_platform_driver *epdrv;
1318 struct platform_device *match;
1323 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1324 /* only use drivers matching our class_str */
1325 if (strcmp(class_str, epdrv->class_str))
1329 match_id = epdrv->requested_id;
1334 left += early_platform_left(epdrv, id);
1336 /* skip requested id */
1337 switch (epdrv->requested_id) {
1338 case EARLY_PLATFORM_ID_ERROR:
1339 case EARLY_PLATFORM_ID_UNSET:
1342 if (epdrv->requested_id == id)
1343 match_id = EARLY_PLATFORM_ID_UNSET;
1348 case EARLY_PLATFORM_ID_ERROR:
1349 pr_warn("%s: unable to parse %s parameter\n",
1350 class_str, epdrv->pdrv->driver.name);
1352 case EARLY_PLATFORM_ID_UNSET:
1356 match = early_platform_match(epdrv, match_id);
1361 * Set up a sensible init_name to enable
1362 * dev_name() and others to be used before the
1363 * rest of the driver core is initialized.
1365 if (!match->dev.init_name && slab_is_available()) {
1366 if (match->id != -1)
1367 match->dev.init_name =
1368 kasprintf(GFP_KERNEL, "%s.%d",
1372 match->dev.init_name =
1373 kasprintf(GFP_KERNEL, "%s",
1376 if (!match->dev.init_name)
1380 if (epdrv->pdrv->probe(match))
1381 pr_warn("%s: unable to probe %s early.\n",
1382 class_str, match->name);
1398 * early_platform_driver_probe - probe a class of registered drivers
1399 * @class_str: string to identify early platform driver class
1400 * @nr_probe: number of platform devices to successfully probe before exiting
1401 * @user_only: only probe user specified early platform devices
1403 * Used by architecture code to probe registered early platform drivers
1404 * within a certain class. For probe to happen a registered early platform
1405 * device matching a registered early platform driver is needed.
1407 int __init early_platform_driver_probe(char *class_str,
1414 for (i = -2; n < nr_probe; i++) {
1415 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1430 * early_platform_cleanup - clean up early platform code
1432 void __init early_platform_cleanup(void)
1434 struct platform_device *pd, *pd2;
1436 /* clean up the devres list used to chain devices */
1437 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1439 list_del(&pd->dev.devres_head);
1440 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));