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>
30 #include <linux/kmemleak.h>
31 #include <linux/types.h>
34 #include "power/power.h"
36 /* For automatically allocated device IDs */
37 static DEFINE_IDA(platform_devid_ida);
39 struct device platform_bus = {
40 .init_name = "platform",
42 EXPORT_SYMBOL_GPL(platform_bus);
45 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
46 * @pdev: platform device
48 * This is called before platform_device_add() such that any pdev_archdata may
49 * be setup before the platform_notifier is called. So if a user needs to
50 * manipulate any relevant information in the pdev_archdata they can do:
52 * platform_device_alloc()
54 * platform_device_add()
56 * And if they don't care they can just call platform_device_register() and
57 * everything will just work out.
59 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
64 * platform_get_resource - get a resource for a device
65 * @dev: platform device
66 * @type: resource type
67 * @num: resource index
69 struct resource *platform_get_resource(struct platform_device *dev,
70 unsigned int type, unsigned int num)
74 for (i = 0; i < dev->num_resources; i++) {
75 struct resource *r = &dev->resource[i];
77 if (type == resource_type(r) && num-- == 0)
82 EXPORT_SYMBOL_GPL(platform_get_resource);
85 * platform_get_irq - get an IRQ for a device
86 * @dev: platform device
87 * @num: IRQ number index
89 int platform_get_irq(struct platform_device *dev, unsigned int num)
92 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
93 if (!dev || num >= dev->archdata.num_irqs)
95 return dev->archdata.irqs[num];
98 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
101 ret = of_irq_get(dev->dev.of_node, num);
102 if (ret > 0 || ret == -EPROBE_DEFER)
106 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
107 if (has_acpi_companion(&dev->dev)) {
108 if (r && r->flags & IORESOURCE_DISABLED) {
111 ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
118 * The resources may pass trigger flags to the irqs that need
119 * to be set up. It so happens that the trigger flags for
120 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
123 if (r && r->flags & IORESOURCE_BITS) {
124 struct irq_data *irqd;
126 irqd = irq_get_irq_data(r->start);
129 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
132 return r ? r->start : -ENXIO;
135 EXPORT_SYMBOL_GPL(platform_get_irq);
138 * platform_irq_count - Count the number of IRQs a platform device uses
139 * @dev: platform device
141 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
143 int platform_irq_count(struct platform_device *dev)
147 while ((ret = platform_get_irq(dev, nr)) >= 0)
150 if (ret == -EPROBE_DEFER)
155 EXPORT_SYMBOL_GPL(platform_irq_count);
158 * platform_get_resource_byname - get a resource for a device by name
159 * @dev: platform device
160 * @type: resource type
161 * @name: resource name
163 struct resource *platform_get_resource_byname(struct platform_device *dev,
169 for (i = 0; i < dev->num_resources; i++) {
170 struct resource *r = &dev->resource[i];
172 if (unlikely(!r->name))
175 if (type == resource_type(r) && !strcmp(r->name, name))
180 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
183 * platform_get_irq_byname - get an IRQ for a device by name
184 * @dev: platform device
187 int platform_get_irq_byname(struct platform_device *dev, const char *name)
191 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
194 ret = of_irq_get_byname(dev->dev.of_node, name);
195 if (ret > 0 || ret == -EPROBE_DEFER)
199 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
200 return r ? r->start : -ENXIO;
202 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
205 * platform_add_devices - add a numbers of platform devices
206 * @devs: array of platform devices to add
207 * @num: number of platform devices in array
209 int platform_add_devices(struct platform_device **devs, int num)
213 for (i = 0; i < num; i++) {
214 ret = platform_device_register(devs[i]);
217 platform_device_unregister(devs[i]);
224 EXPORT_SYMBOL_GPL(platform_add_devices);
226 struct platform_object {
227 struct platform_device pdev;
232 * platform_device_put - destroy a platform device
233 * @pdev: platform device to free
235 * Free all memory associated with a platform device. This function must
236 * _only_ be externally called in error cases. All other usage is a bug.
238 void platform_device_put(struct platform_device *pdev)
241 put_device(&pdev->dev);
243 EXPORT_SYMBOL_GPL(platform_device_put);
245 static void platform_device_release(struct device *dev)
247 struct platform_object *pa = container_of(dev, struct platform_object,
250 of_device_node_put(&pa->pdev.dev);
251 kfree(pa->pdev.dev.platform_data);
252 kfree(pa->pdev.mfd_cell);
253 kfree(pa->pdev.resource);
254 kfree(pa->pdev.driver_override);
259 * platform_device_alloc - create a platform device
260 * @name: base name of the device we're adding
263 * Create a platform device object which can have other objects attached
264 * to it, and which will have attached objects freed when it is released.
266 struct platform_device *platform_device_alloc(const char *name, int id)
268 struct platform_object *pa;
270 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
272 strcpy(pa->name, name);
273 pa->pdev.name = pa->name;
275 device_initialize(&pa->pdev.dev);
276 pa->pdev.dev.release = platform_device_release;
277 arch_setup_pdev_archdata(&pa->pdev);
280 return pa ? &pa->pdev : NULL;
282 EXPORT_SYMBOL_GPL(platform_device_alloc);
285 * platform_device_add_resources - add resources to a platform device
286 * @pdev: platform device allocated by platform_device_alloc to add resources to
287 * @res: set of resources that needs to be allocated for the device
288 * @num: number of resources
290 * Add a copy of the resources to the platform device. The memory
291 * associated with the resources will be freed when the platform device is
294 int platform_device_add_resources(struct platform_device *pdev,
295 const struct resource *res, unsigned int num)
297 struct resource *r = NULL;
300 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
305 kfree(pdev->resource);
307 pdev->num_resources = num;
310 EXPORT_SYMBOL_GPL(platform_device_add_resources);
313 * platform_device_add_data - add platform-specific data to a platform device
314 * @pdev: platform device allocated by platform_device_alloc to add resources to
315 * @data: platform specific data for this platform device
316 * @size: size of platform specific data
318 * Add a copy of platform specific data to the platform device's
319 * platform_data pointer. The memory associated with the platform data
320 * will be freed when the platform device is released.
322 int platform_device_add_data(struct platform_device *pdev, const void *data,
328 d = kmemdup(data, size, GFP_KERNEL);
333 kfree(pdev->dev.platform_data);
334 pdev->dev.platform_data = d;
337 EXPORT_SYMBOL_GPL(platform_device_add_data);
340 * platform_device_add_properties - add built-in properties to a platform device
341 * @pdev: platform device to add properties to
342 * @properties: null terminated array of properties to add
344 * The function will take deep copy of @properties and attach the copy to the
345 * platform device. The memory associated with properties will be freed when the
346 * platform device is released.
348 int platform_device_add_properties(struct platform_device *pdev,
349 const struct property_entry *properties)
351 return device_add_properties(&pdev->dev, properties);
353 EXPORT_SYMBOL_GPL(platform_device_add_properties);
356 * platform_device_add - add a platform device to device hierarchy
357 * @pdev: platform device we're adding
359 * This is part 2 of platform_device_register(), though may be called
360 * separately _iff_ pdev was allocated by platform_device_alloc().
362 int platform_device_add(struct platform_device *pdev)
370 if (!pdev->dev.parent)
371 pdev->dev.parent = &platform_bus;
373 pdev->dev.bus = &platform_bus_type;
377 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
379 case PLATFORM_DEVID_NONE:
380 dev_set_name(&pdev->dev, "%s", pdev->name);
382 case PLATFORM_DEVID_AUTO:
384 * Automatically allocated device ID. We mark it as such so
385 * that we remember it must be freed, and we append a suffix
386 * to avoid namespace collision with explicit IDs.
388 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
392 pdev->id_auto = true;
393 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
397 for (i = 0; i < pdev->num_resources; i++) {
398 struct resource *p, *r = &pdev->resource[i];
401 r->name = dev_name(&pdev->dev);
405 if (resource_type(r) == IORESOURCE_MEM)
407 else if (resource_type(r) == IORESOURCE_IO)
408 p = &ioport_resource;
411 if (p && insert_resource(p, r)) {
412 dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
418 pr_debug("Registering platform device '%s'. Parent at %s\n",
419 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
421 ret = device_add(&pdev->dev);
427 ida_simple_remove(&platform_devid_ida, pdev->id);
428 pdev->id = PLATFORM_DEVID_AUTO;
432 struct resource *r = &pdev->resource[i];
440 EXPORT_SYMBOL_GPL(platform_device_add);
443 * platform_device_del - remove a platform-level device
444 * @pdev: platform device we're removing
446 * Note that this function will also release all memory- and port-based
447 * resources owned by the device (@dev->resource). This function must
448 * _only_ be externally called in error cases. All other usage is a bug.
450 void platform_device_del(struct platform_device *pdev)
455 device_remove_properties(&pdev->dev);
456 device_del(&pdev->dev);
459 ida_simple_remove(&platform_devid_ida, pdev->id);
460 pdev->id = PLATFORM_DEVID_AUTO;
463 for (i = 0; i < pdev->num_resources; i++) {
464 struct resource *r = &pdev->resource[i];
470 EXPORT_SYMBOL_GPL(platform_device_del);
473 * platform_device_register - add a platform-level device
474 * @pdev: platform device we're adding
476 int platform_device_register(struct platform_device *pdev)
478 device_initialize(&pdev->dev);
479 arch_setup_pdev_archdata(pdev);
480 return platform_device_add(pdev);
482 EXPORT_SYMBOL_GPL(platform_device_register);
485 * platform_device_unregister - unregister a platform-level device
486 * @pdev: platform device we're unregistering
488 * Unregistration is done in 2 steps. First we release all resources
489 * and remove it from the subsystem, then we drop reference count by
490 * calling platform_device_put().
492 void platform_device_unregister(struct platform_device *pdev)
494 platform_device_del(pdev);
495 platform_device_put(pdev);
497 EXPORT_SYMBOL_GPL(platform_device_unregister);
500 * platform_device_register_full - add a platform-level device with
501 * resources and platform-specific data
503 * @pdevinfo: data used to create device
505 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
507 struct platform_device *platform_device_register_full(
508 const struct platform_device_info *pdevinfo)
511 struct platform_device *pdev;
513 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
517 pdev->dev.parent = pdevinfo->parent;
518 pdev->dev.fwnode = pdevinfo->fwnode;
520 if (pdevinfo->dma_mask) {
522 * This memory isn't freed when the device is put,
523 * I don't have a nice idea for that though. Conceptually
524 * dma_mask in struct device should not be a pointer.
525 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
528 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
529 if (!pdev->dev.dma_mask)
532 kmemleak_ignore(pdev->dev.dma_mask);
534 *pdev->dev.dma_mask = pdevinfo->dma_mask;
535 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
538 ret = platform_device_add_resources(pdev,
539 pdevinfo->res, pdevinfo->num_res);
543 ret = platform_device_add_data(pdev,
544 pdevinfo->data, pdevinfo->size_data);
548 if (pdevinfo->properties) {
549 ret = platform_device_add_properties(pdev,
550 pdevinfo->properties);
555 ret = platform_device_add(pdev);
558 ACPI_COMPANION_SET(&pdev->dev, NULL);
559 kfree(pdev->dev.dma_mask);
562 platform_device_put(pdev);
568 EXPORT_SYMBOL_GPL(platform_device_register_full);
570 static int platform_drv_probe(struct device *_dev)
572 struct platform_driver *drv = to_platform_driver(_dev->driver);
573 struct platform_device *dev = to_platform_device(_dev);
576 ret = of_clk_set_defaults(_dev->of_node, false);
580 ret = dev_pm_domain_attach(_dev, true);
581 if (ret != -EPROBE_DEFER) {
583 ret = drv->probe(dev);
585 dev_pm_domain_detach(_dev, true);
587 /* don't fail if just dev_pm_domain_attach failed */
592 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
593 dev_warn(_dev, "probe deferral not supported\n");
600 static int platform_drv_probe_fail(struct device *_dev)
605 static int platform_drv_remove(struct device *_dev)
607 struct platform_driver *drv = to_platform_driver(_dev->driver);
608 struct platform_device *dev = to_platform_device(_dev);
612 ret = drv->remove(dev);
613 dev_pm_domain_detach(_dev, true);
618 static void platform_drv_shutdown(struct device *_dev)
620 struct platform_driver *drv = to_platform_driver(_dev->driver);
621 struct platform_device *dev = to_platform_device(_dev);
628 * __platform_driver_register - register a driver for platform-level devices
629 * @drv: platform driver structure
630 * @owner: owning module/driver
632 int __platform_driver_register(struct platform_driver *drv,
633 struct module *owner)
635 drv->driver.owner = owner;
636 drv->driver.bus = &platform_bus_type;
637 drv->driver.probe = platform_drv_probe;
638 drv->driver.remove = platform_drv_remove;
639 drv->driver.shutdown = platform_drv_shutdown;
641 return driver_register(&drv->driver);
643 EXPORT_SYMBOL_GPL(__platform_driver_register);
646 * platform_driver_unregister - unregister a driver for platform-level devices
647 * @drv: platform driver structure
649 void platform_driver_unregister(struct platform_driver *drv)
651 driver_unregister(&drv->driver);
653 EXPORT_SYMBOL_GPL(platform_driver_unregister);
656 * __platform_driver_probe - register driver for non-hotpluggable device
657 * @drv: platform driver structure
658 * @probe: the driver probe routine, probably from an __init section
659 * @module: module which will be the owner of the driver
661 * Use this instead of platform_driver_register() when you know the device
662 * is not hotpluggable and has already been registered, and you want to
663 * remove its run-once probe() infrastructure from memory after the driver
664 * has bound to the device.
666 * One typical use for this would be with drivers for controllers integrated
667 * into system-on-chip processors, where the controller devices have been
668 * configured as part of board setup.
670 * Note that this is incompatible with deferred probing.
672 * Returns zero if the driver registered and bound to a device, else returns
673 * a negative error code and with the driver not registered.
675 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
676 int (*probe)(struct platform_device *), struct module *module)
680 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
681 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
682 drv->driver.name, __func__);
687 * We have to run our probes synchronously because we check if
688 * we find any devices to bind to and exit with error if there
691 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
694 * Prevent driver from requesting probe deferral to avoid further
695 * futile probe attempts.
697 drv->prevent_deferred_probe = true;
699 /* make sure driver won't have bind/unbind attributes */
700 drv->driver.suppress_bind_attrs = true;
702 /* temporary section violation during probe() */
704 retval = code = __platform_driver_register(drv, module);
709 * Fixup that section violation, being paranoid about code scanning
710 * the list of drivers in order to probe new devices. Check to see
711 * if the probe was successful, and make sure any forced probes of
714 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
716 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
718 drv->driver.probe = platform_drv_probe_fail;
719 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
722 platform_driver_unregister(drv);
725 EXPORT_SYMBOL_GPL(__platform_driver_probe);
728 * __platform_create_bundle - register driver and create corresponding device
729 * @driver: platform driver structure
730 * @probe: the driver probe routine, probably from an __init section
731 * @res: set of resources that needs to be allocated for the device
732 * @n_res: number of resources
733 * @data: platform specific data for this platform device
734 * @size: size of platform specific data
735 * @module: module which will be the owner of the driver
737 * Use this in legacy-style modules that probe hardware directly and
738 * register a single platform device and corresponding platform driver.
740 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
742 struct platform_device * __init_or_module __platform_create_bundle(
743 struct platform_driver *driver,
744 int (*probe)(struct platform_device *),
745 struct resource *res, unsigned int n_res,
746 const void *data, size_t size, struct module *module)
748 struct platform_device *pdev;
751 pdev = platform_device_alloc(driver->driver.name, -1);
757 error = platform_device_add_resources(pdev, res, n_res);
761 error = platform_device_add_data(pdev, data, size);
765 error = platform_device_add(pdev);
769 error = __platform_driver_probe(driver, probe, module);
776 platform_device_del(pdev);
778 platform_device_put(pdev);
780 return ERR_PTR(error);
782 EXPORT_SYMBOL_GPL(__platform_create_bundle);
785 * __platform_register_drivers - register an array of platform drivers
786 * @drivers: an array of drivers to register
787 * @count: the number of drivers to register
788 * @owner: module owning the drivers
790 * Registers platform drivers specified by an array. On failure to register a
791 * driver, all previously registered drivers will be unregistered. Callers of
792 * this API should use platform_unregister_drivers() to unregister drivers in
795 * Returns: 0 on success or a negative error code on failure.
797 int __platform_register_drivers(struct platform_driver * const *drivers,
798 unsigned int count, struct module *owner)
803 for (i = 0; i < count; i++) {
804 pr_debug("registering platform driver %ps\n", drivers[i]);
806 err = __platform_driver_register(drivers[i], owner);
808 pr_err("failed to register platform driver %ps: %d\n",
818 pr_debug("unregistering platform driver %ps\n", drivers[i]);
819 platform_driver_unregister(drivers[i]);
824 EXPORT_SYMBOL_GPL(__platform_register_drivers);
827 * platform_unregister_drivers - unregister an array of platform drivers
828 * @drivers: an array of drivers to unregister
829 * @count: the number of drivers to unregister
831 * Unegisters platform drivers specified by an array. This is typically used
832 * to complement an earlier call to platform_register_drivers(). Drivers are
833 * unregistered in the reverse order in which they were registered.
835 void platform_unregister_drivers(struct platform_driver * const *drivers,
839 pr_debug("unregistering platform driver %ps\n", drivers[count]);
840 platform_driver_unregister(drivers[count]);
843 EXPORT_SYMBOL_GPL(platform_unregister_drivers);
845 /* modalias support enables more hands-off userspace setup:
846 * (a) environment variable lets new-style hotplug events work once system is
847 * fully running: "modprobe $MODALIAS"
848 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
849 * mishandled before system is fully running: "modprobe $(cat modalias)"
851 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
854 struct platform_device *pdev = to_platform_device(dev);
857 len = of_device_modalias(dev, buf, PAGE_SIZE);
861 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
865 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
867 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
869 static DEVICE_ATTR_RO(modalias);
871 static ssize_t driver_override_store(struct device *dev,
872 struct device_attribute *attr,
873 const char *buf, size_t count)
875 struct platform_device *pdev = to_platform_device(dev);
876 char *driver_override, *old, *cp;
878 /* We need to keep extra room for a newline */
879 if (count >= (PAGE_SIZE - 1))
882 driver_override = kstrndup(buf, count, GFP_KERNEL);
883 if (!driver_override)
886 cp = strchr(driver_override, '\n');
891 old = pdev->driver_override;
892 if (strlen(driver_override)) {
893 pdev->driver_override = driver_override;
895 kfree(driver_override);
896 pdev->driver_override = NULL;
905 static ssize_t driver_override_show(struct device *dev,
906 struct device_attribute *attr, char *buf)
908 struct platform_device *pdev = to_platform_device(dev);
912 len = sprintf(buf, "%s\n", pdev->driver_override);
916 static DEVICE_ATTR_RW(driver_override);
919 static struct attribute *platform_dev_attrs[] = {
920 &dev_attr_modalias.attr,
921 &dev_attr_driver_override.attr,
924 ATTRIBUTE_GROUPS(platform_dev);
926 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
928 struct platform_device *pdev = to_platform_device(dev);
931 /* Some devices have extra OF data and an OF-style MODALIAS */
932 rc = of_device_uevent_modalias(dev, env);
936 rc = acpi_device_uevent_modalias(dev, env);
940 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
945 static const struct platform_device_id *platform_match_id(
946 const struct platform_device_id *id,
947 struct platform_device *pdev)
949 while (id->name[0]) {
950 if (strcmp(pdev->name, id->name) == 0) {
960 * platform_match - bind platform device to platform driver.
964 * Platform device IDs are assumed to be encoded like this:
965 * "<name><instance>", where <name> is a short description of the type of
966 * device, like "pci" or "floppy", and <instance> is the enumerated
967 * instance of the device, like '0' or '42'. Driver IDs are simply
968 * "<name>". So, extract the <name> from the platform_device structure,
969 * and compare it against the name of the driver. Return whether they match
972 static int platform_match(struct device *dev, struct device_driver *drv)
974 struct platform_device *pdev = to_platform_device(dev);
975 struct platform_driver *pdrv = to_platform_driver(drv);
977 /* When driver_override is set, only bind to the matching driver */
978 if (pdev->driver_override)
979 return !strcmp(pdev->driver_override, drv->name);
981 /* Attempt an OF style match first */
982 if (of_driver_match_device(dev, drv))
985 /* Then try ACPI style match */
986 if (acpi_driver_match_device(dev, drv))
989 /* Then try to match against the id table */
991 return platform_match_id(pdrv->id_table, pdev) != NULL;
993 /* fall-back to driver name match */
994 return (strcmp(pdev->name, drv->name) == 0);
997 #ifdef CONFIG_PM_SLEEP
999 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
1001 struct platform_driver *pdrv = to_platform_driver(dev->driver);
1002 struct platform_device *pdev = to_platform_device(dev);
1005 if (dev->driver && pdrv->suspend)
1006 ret = pdrv->suspend(pdev, mesg);
1011 static int platform_legacy_resume(struct device *dev)
1013 struct platform_driver *pdrv = to_platform_driver(dev->driver);
1014 struct platform_device *pdev = to_platform_device(dev);
1017 if (dev->driver && pdrv->resume)
1018 ret = pdrv->resume(pdev);
1023 #endif /* CONFIG_PM_SLEEP */
1025 #ifdef CONFIG_SUSPEND
1027 int platform_pm_suspend(struct device *dev)
1029 struct device_driver *drv = dev->driver;
1036 if (drv->pm->suspend)
1037 ret = drv->pm->suspend(dev);
1039 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1045 int platform_pm_resume(struct device *dev)
1047 struct device_driver *drv = dev->driver;
1054 if (drv->pm->resume)
1055 ret = drv->pm->resume(dev);
1057 ret = platform_legacy_resume(dev);
1063 #endif /* CONFIG_SUSPEND */
1065 #ifdef CONFIG_HIBERNATE_CALLBACKS
1067 int platform_pm_freeze(struct device *dev)
1069 struct device_driver *drv = dev->driver;
1076 if (drv->pm->freeze)
1077 ret = drv->pm->freeze(dev);
1079 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1085 int platform_pm_thaw(struct device *dev)
1087 struct device_driver *drv = dev->driver;
1095 ret = drv->pm->thaw(dev);
1097 ret = platform_legacy_resume(dev);
1103 int platform_pm_poweroff(struct device *dev)
1105 struct device_driver *drv = dev->driver;
1112 if (drv->pm->poweroff)
1113 ret = drv->pm->poweroff(dev);
1115 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1121 int platform_pm_restore(struct device *dev)
1123 struct device_driver *drv = dev->driver;
1130 if (drv->pm->restore)
1131 ret = drv->pm->restore(dev);
1133 ret = platform_legacy_resume(dev);
1139 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1141 static const struct dev_pm_ops platform_dev_pm_ops = {
1142 .runtime_suspend = pm_generic_runtime_suspend,
1143 .runtime_resume = pm_generic_runtime_resume,
1144 USE_PLATFORM_PM_SLEEP_OPS
1147 struct bus_type platform_bus_type = {
1149 .dev_groups = platform_dev_groups,
1150 .match = platform_match,
1151 .uevent = platform_uevent,
1152 .pm = &platform_dev_pm_ops,
1154 EXPORT_SYMBOL_GPL(platform_bus_type);
1156 int __init platform_bus_init(void)
1160 early_platform_cleanup();
1162 error = device_register(&platform_bus);
1165 error = bus_register(&platform_bus_type);
1167 device_unregister(&platform_bus);
1168 of_platform_register_reconfig_notifier();
1172 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1173 u64 dma_get_required_mask(struct device *dev)
1175 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1176 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1179 if (!high_totalram) {
1180 /* convert to mask just covering totalram */
1181 low_totalram = (1 << (fls(low_totalram) - 1));
1182 low_totalram += low_totalram - 1;
1183 mask = low_totalram;
1185 high_totalram = (1 << (fls(high_totalram) - 1));
1186 high_totalram += high_totalram - 1;
1187 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1191 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1194 static __initdata LIST_HEAD(early_platform_driver_list);
1195 static __initdata LIST_HEAD(early_platform_device_list);
1198 * early_platform_driver_register - register early platform driver
1199 * @epdrv: early_platform driver structure
1200 * @buf: string passed from early_param()
1202 * Helper function for early_platform_init() / early_platform_init_buffer()
1204 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1210 /* Simply add the driver to the end of the global list.
1211 * Drivers will by default be put on the list in compiled-in order.
1213 if (!epdrv->list.next) {
1214 INIT_LIST_HEAD(&epdrv->list);
1215 list_add_tail(&epdrv->list, &early_platform_driver_list);
1218 /* If the user has specified device then make sure the driver
1219 * gets prioritized. The driver of the last device specified on
1220 * command line will be put first on the list.
1222 n = strlen(epdrv->pdrv->driver.name);
1223 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1224 list_move(&epdrv->list, &early_platform_driver_list);
1226 /* Allow passing parameters after device name */
1227 if (buf[n] == '\0' || buf[n] == ',')
1228 epdrv->requested_id = -1;
1230 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1233 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1234 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1237 n += strcspn(&buf[n + 1], ",") + 1;
1243 if (epdrv->bufsize) {
1244 memcpy(epdrv->buffer, &buf[n],
1245 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1246 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1254 * early_platform_add_devices - adds a number of early platform devices
1255 * @devs: array of early platform devices to add
1256 * @num: number of early platform devices in array
1258 * Used by early architecture code to register early platform devices and
1259 * their platform data.
1261 void __init early_platform_add_devices(struct platform_device **devs, int num)
1266 /* simply add the devices to list */
1267 for (i = 0; i < num; i++) {
1268 dev = &devs[i]->dev;
1270 if (!dev->devres_head.next) {
1271 pm_runtime_early_init(dev);
1272 INIT_LIST_HEAD(&dev->devres_head);
1273 list_add_tail(&dev->devres_head,
1274 &early_platform_device_list);
1280 * early_platform_driver_register_all - register early platform drivers
1281 * @class_str: string to identify early platform driver class
1283 * Used by architecture code to register all early platform drivers
1284 * for a certain class. If omitted then only early platform drivers
1285 * with matching kernel command line class parameters will be registered.
1287 void __init early_platform_driver_register_all(char *class_str)
1289 /* The "class_str" parameter may or may not be present on the kernel
1290 * command line. If it is present then there may be more than one
1291 * matching parameter.
1293 * Since we register our early platform drivers using early_param()
1294 * we need to make sure that they also get registered in the case
1295 * when the parameter is missing from the kernel command line.
1297 * We use parse_early_options() to make sure the early_param() gets
1298 * called at least once. The early_param() may be called more than
1299 * once since the name of the preferred device may be specified on
1300 * the kernel command line. early_platform_driver_register() handles
1303 parse_early_options(class_str);
1307 * early_platform_match - find early platform device matching driver
1308 * @epdrv: early platform driver structure
1309 * @id: id to match against
1311 static struct platform_device * __init
1312 early_platform_match(struct early_platform_driver *epdrv, int id)
1314 struct platform_device *pd;
1316 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1317 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1325 * early_platform_left - check if early platform driver has matching devices
1326 * @epdrv: early platform driver structure
1327 * @id: return true if id or above exists
1329 static int __init early_platform_left(struct early_platform_driver *epdrv,
1332 struct platform_device *pd;
1334 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1335 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1343 * early_platform_driver_probe_id - probe drivers matching class_str and id
1344 * @class_str: string to identify early platform driver class
1345 * @id: id to match against
1346 * @nr_probe: number of platform devices to successfully probe before exiting
1348 static int __init early_platform_driver_probe_id(char *class_str,
1352 struct early_platform_driver *epdrv;
1353 struct platform_device *match;
1358 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1359 /* only use drivers matching our class_str */
1360 if (strcmp(class_str, epdrv->class_str))
1364 match_id = epdrv->requested_id;
1369 left += early_platform_left(epdrv, id);
1371 /* skip requested id */
1372 switch (epdrv->requested_id) {
1373 case EARLY_PLATFORM_ID_ERROR:
1374 case EARLY_PLATFORM_ID_UNSET:
1377 if (epdrv->requested_id == id)
1378 match_id = EARLY_PLATFORM_ID_UNSET;
1383 case EARLY_PLATFORM_ID_ERROR:
1384 pr_warn("%s: unable to parse %s parameter\n",
1385 class_str, epdrv->pdrv->driver.name);
1387 case EARLY_PLATFORM_ID_UNSET:
1391 match = early_platform_match(epdrv, match_id);
1396 * Set up a sensible init_name to enable
1397 * dev_name() and others to be used before the
1398 * rest of the driver core is initialized.
1400 if (!match->dev.init_name && slab_is_available()) {
1401 if (match->id != -1)
1402 match->dev.init_name =
1403 kasprintf(GFP_KERNEL, "%s.%d",
1407 match->dev.init_name =
1408 kasprintf(GFP_KERNEL, "%s",
1411 if (!match->dev.init_name)
1415 if (epdrv->pdrv->probe(match))
1416 pr_warn("%s: unable to probe %s early.\n",
1417 class_str, match->name);
1433 * early_platform_driver_probe - probe a class of registered drivers
1434 * @class_str: string to identify early platform driver class
1435 * @nr_probe: number of platform devices to successfully probe before exiting
1436 * @user_only: only probe user specified early platform devices
1438 * Used by architecture code to probe registered early platform drivers
1439 * within a certain class. For probe to happen a registered early platform
1440 * device matching a registered early platform driver is needed.
1442 int __init early_platform_driver_probe(char *class_str,
1449 for (i = -2; n < nr_probe; i++) {
1450 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1465 * early_platform_cleanup - clean up early platform code
1467 void __init early_platform_cleanup(void)
1469 struct platform_device *pd, *pd2;
1471 /* clean up the devres list used to chain devices */
1472 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1474 list_del(&pd->dev.devres_head);
1475 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));