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/module.h>
17 #include <linux/init.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/bootmem.h>
20 #include <linux/err.h>
21 #include <linux/slab.h>
22 #include <linux/pm_runtime.h>
25 #include "power/power.h"
27 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
30 struct device platform_bus = {
31 .init_name = "platform",
33 EXPORT_SYMBOL_GPL(platform_bus);
36 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
37 * @pdev: platform device
39 * This is called before platform_device_add() such that any pdev_archdata may
40 * be setup before the platform_notifier is called. So if a user needs to
41 * manipulate any relevant information in the pdev_archdata they can do:
43 * platform_devic_alloc()
45 * platform_device_add()
47 * And if they don't care they can just call platform_device_register() and
48 * everything will just work out.
50 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
55 * platform_get_resource - get a resource for a device
56 * @dev: platform device
57 * @type: resource type
58 * @num: resource index
60 struct resource *platform_get_resource(struct platform_device *dev,
61 unsigned int type, unsigned int num)
65 for (i = 0; i < dev->num_resources; i++) {
66 struct resource *r = &dev->resource[i];
68 if (type == resource_type(r) && num-- == 0)
73 EXPORT_SYMBOL_GPL(platform_get_resource);
76 * platform_get_irq - get an IRQ for a device
77 * @dev: platform device
78 * @num: IRQ number index
80 int platform_get_irq(struct platform_device *dev, unsigned int num)
82 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
84 return r ? r->start : -ENXIO;
86 EXPORT_SYMBOL_GPL(platform_get_irq);
89 * platform_get_resource_byname - get a resource for a device by name
90 * @dev: platform device
91 * @type: resource type
92 * @name: resource name
94 struct resource *platform_get_resource_byname(struct platform_device *dev,
100 for (i = 0; i < dev->num_resources; i++) {
101 struct resource *r = &dev->resource[i];
103 if (type == resource_type(r) && !strcmp(r->name, name))
108 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
111 * platform_get_irq - get an IRQ for a device
112 * @dev: platform device
115 int platform_get_irq_byname(struct platform_device *dev, const char *name)
117 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
120 return r ? r->start : -ENXIO;
122 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
125 * platform_add_devices - add a numbers of platform devices
126 * @devs: array of platform devices to add
127 * @num: number of platform devices in array
129 int platform_add_devices(struct platform_device **devs, int num)
133 for (i = 0; i < num; i++) {
134 ret = platform_device_register(devs[i]);
137 platform_device_unregister(devs[i]);
144 EXPORT_SYMBOL_GPL(platform_add_devices);
146 struct platform_object {
147 struct platform_device pdev;
152 * platform_device_put - destroy a platform device
153 * @pdev: platform device to free
155 * Free all memory associated with a platform device. This function must
156 * _only_ be externally called in error cases. All other usage is a bug.
158 void platform_device_put(struct platform_device *pdev)
161 put_device(&pdev->dev);
163 EXPORT_SYMBOL_GPL(platform_device_put);
165 static void platform_device_release(struct device *dev)
167 struct platform_object *pa = container_of(dev, struct platform_object,
170 of_device_node_put(&pa->pdev.dev);
171 kfree(pa->pdev.dev.platform_data);
172 kfree(pa->pdev.mfd_cell);
173 kfree(pa->pdev.resource);
178 * platform_device_alloc - create a platform device
179 * @name: base name of the device we're adding
182 * Create a platform device object which can have other objects attached
183 * to it, and which will have attached objects freed when it is released.
185 struct platform_device *platform_device_alloc(const char *name, int id)
187 struct platform_object *pa;
189 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
191 strcpy(pa->name, name);
192 pa->pdev.name = pa->name;
194 device_initialize(&pa->pdev.dev);
195 pa->pdev.dev.release = platform_device_release;
196 arch_setup_pdev_archdata(&pa->pdev);
199 return pa ? &pa->pdev : NULL;
201 EXPORT_SYMBOL_GPL(platform_device_alloc);
204 * platform_device_add_resources - add resources to a platform device
205 * @pdev: platform device allocated by platform_device_alloc to add resources to
206 * @res: set of resources that needs to be allocated for the device
207 * @num: number of resources
209 * Add a copy of the resources to the platform device. The memory
210 * associated with the resources will be freed when the platform device is
213 int platform_device_add_resources(struct platform_device *pdev,
214 const struct resource *res, unsigned int num)
216 struct resource *r = NULL;
219 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
224 kfree(pdev->resource);
226 pdev->num_resources = num;
229 EXPORT_SYMBOL_GPL(platform_device_add_resources);
232 * platform_device_add_data - add platform-specific data to a platform device
233 * @pdev: platform device allocated by platform_device_alloc to add resources to
234 * @data: platform specific data for this platform device
235 * @size: size of platform specific data
237 * Add a copy of platform specific data to the platform device's
238 * platform_data pointer. The memory associated with the platform data
239 * will be freed when the platform device is released.
241 int platform_device_add_data(struct platform_device *pdev, const void *data,
247 d = kmemdup(data, size, GFP_KERNEL);
252 kfree(pdev->dev.platform_data);
253 pdev->dev.platform_data = d;
256 EXPORT_SYMBOL_GPL(platform_device_add_data);
259 * platform_device_add - add a platform device to device hierarchy
260 * @pdev: platform device we're adding
262 * This is part 2 of platform_device_register(), though may be called
263 * separately _iff_ pdev was allocated by platform_device_alloc().
265 int platform_device_add(struct platform_device *pdev)
272 if (!pdev->dev.parent)
273 pdev->dev.parent = &platform_bus;
275 pdev->dev.bus = &platform_bus_type;
278 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
280 dev_set_name(&pdev->dev, "%s", pdev->name);
282 for (i = 0; i < pdev->num_resources; i++) {
283 struct resource *p, *r = &pdev->resource[i];
286 r->name = dev_name(&pdev->dev);
290 if (resource_type(r) == IORESOURCE_MEM)
292 else if (resource_type(r) == IORESOURCE_IO)
293 p = &ioport_resource;
296 if (p && insert_resource(p, r)) {
298 "%s: failed to claim resource %d\n",
299 dev_name(&pdev->dev), i);
305 pr_debug("Registering platform device '%s'. Parent at %s\n",
306 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
308 ret = device_add(&pdev->dev);
314 struct resource *r = &pdev->resource[i];
315 unsigned long type = resource_type(r);
317 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
323 EXPORT_SYMBOL_GPL(platform_device_add);
326 * platform_device_del - remove a platform-level device
327 * @pdev: platform device we're removing
329 * Note that this function will also release all memory- and port-based
330 * resources owned by the device (@dev->resource). This function must
331 * _only_ be externally called in error cases. All other usage is a bug.
333 void platform_device_del(struct platform_device *pdev)
338 device_del(&pdev->dev);
340 for (i = 0; i < pdev->num_resources; i++) {
341 struct resource *r = &pdev->resource[i];
342 unsigned long type = resource_type(r);
344 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
349 EXPORT_SYMBOL_GPL(platform_device_del);
352 * platform_device_register - add a platform-level device
353 * @pdev: platform device we're adding
355 int platform_device_register(struct platform_device *pdev)
357 device_initialize(&pdev->dev);
358 arch_setup_pdev_archdata(pdev);
359 return platform_device_add(pdev);
361 EXPORT_SYMBOL_GPL(platform_device_register);
364 * platform_device_unregister - unregister a platform-level device
365 * @pdev: platform device we're unregistering
367 * Unregistration is done in 2 steps. First we release all resources
368 * and remove it from the subsystem, then we drop reference count by
369 * calling platform_device_put().
371 void platform_device_unregister(struct platform_device *pdev)
373 platform_device_del(pdev);
374 platform_device_put(pdev);
376 EXPORT_SYMBOL_GPL(platform_device_unregister);
379 * platform_device_register_full - add a platform-level device with
380 * resources and platform-specific data
382 * @pdevinfo: data used to create device
384 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
386 struct platform_device *platform_device_register_full(
387 const struct platform_device_info *pdevinfo)
390 struct platform_device *pdev;
392 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
396 pdev->dev.parent = pdevinfo->parent;
398 if (pdevinfo->dma_mask) {
400 * This memory isn't freed when the device is put,
401 * I don't have a nice idea for that though. Conceptually
402 * dma_mask in struct device should not be a pointer.
403 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
406 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
407 if (!pdev->dev.dma_mask)
410 *pdev->dev.dma_mask = pdevinfo->dma_mask;
411 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
414 ret = platform_device_add_resources(pdev,
415 pdevinfo->res, pdevinfo->num_res);
419 ret = platform_device_add_data(pdev,
420 pdevinfo->data, pdevinfo->size_data);
424 ret = platform_device_add(pdev);
427 kfree(pdev->dev.dma_mask);
430 platform_device_put(pdev);
436 EXPORT_SYMBOL_GPL(platform_device_register_full);
438 static int platform_drv_probe(struct device *_dev)
440 struct platform_driver *drv = to_platform_driver(_dev->driver);
441 struct platform_device *dev = to_platform_device(_dev);
443 return drv->probe(dev);
446 static int platform_drv_probe_fail(struct device *_dev)
451 static int platform_drv_remove(struct device *_dev)
453 struct platform_driver *drv = to_platform_driver(_dev->driver);
454 struct platform_device *dev = to_platform_device(_dev);
456 return drv->remove(dev);
459 static void platform_drv_shutdown(struct device *_dev)
461 struct platform_driver *drv = to_platform_driver(_dev->driver);
462 struct platform_device *dev = to_platform_device(_dev);
468 * platform_driver_register - register a driver for platform-level devices
469 * @drv: platform driver structure
471 int platform_driver_register(struct platform_driver *drv)
473 drv->driver.bus = &platform_bus_type;
475 drv->driver.probe = platform_drv_probe;
477 drv->driver.remove = platform_drv_remove;
479 drv->driver.shutdown = platform_drv_shutdown;
481 return driver_register(&drv->driver);
483 EXPORT_SYMBOL_GPL(platform_driver_register);
486 * platform_driver_unregister - unregister a driver for platform-level devices
487 * @drv: platform driver structure
489 void platform_driver_unregister(struct platform_driver *drv)
491 driver_unregister(&drv->driver);
493 EXPORT_SYMBOL_GPL(platform_driver_unregister);
496 * platform_driver_probe - register driver for non-hotpluggable device
497 * @drv: platform driver structure
498 * @probe: the driver probe routine, probably from an __init section
500 * Use this instead of platform_driver_register() when you know the device
501 * is not hotpluggable and has already been registered, and you want to
502 * remove its run-once probe() infrastructure from memory after the driver
503 * has bound to the device.
505 * One typical use for this would be with drivers for controllers integrated
506 * into system-on-chip processors, where the controller devices have been
507 * configured as part of board setup.
509 * Returns zero if the driver registered and bound to a device, else returns
510 * a negative error code and with the driver not registered.
512 int __init_or_module platform_driver_probe(struct platform_driver *drv,
513 int (*probe)(struct platform_device *))
517 /* make sure driver won't have bind/unbind attributes */
518 drv->driver.suppress_bind_attrs = true;
520 /* temporary section violation during probe() */
522 retval = code = platform_driver_register(drv);
525 * Fixup that section violation, being paranoid about code scanning
526 * the list of drivers in order to probe new devices. Check to see
527 * if the probe was successful, and make sure any forced probes of
530 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
532 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
534 drv->driver.probe = platform_drv_probe_fail;
535 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
538 platform_driver_unregister(drv);
541 EXPORT_SYMBOL_GPL(platform_driver_probe);
544 * platform_create_bundle - register driver and create corresponding device
545 * @driver: platform driver structure
546 * @probe: the driver probe routine, probably from an __init section
547 * @res: set of resources that needs to be allocated for the device
548 * @n_res: number of resources
549 * @data: platform specific data for this platform device
550 * @size: size of platform specific data
552 * Use this in legacy-style modules that probe hardware directly and
553 * register a single platform device and corresponding platform driver.
555 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
557 struct platform_device * __init_or_module platform_create_bundle(
558 struct platform_driver *driver,
559 int (*probe)(struct platform_device *),
560 struct resource *res, unsigned int n_res,
561 const void *data, size_t size)
563 struct platform_device *pdev;
566 pdev = platform_device_alloc(driver->driver.name, -1);
572 error = platform_device_add_resources(pdev, res, n_res);
576 error = platform_device_add_data(pdev, data, size);
580 error = platform_device_add(pdev);
584 error = platform_driver_probe(driver, probe);
591 platform_device_del(pdev);
593 platform_device_put(pdev);
595 return ERR_PTR(error);
597 EXPORT_SYMBOL_GPL(platform_create_bundle);
599 /* modalias support enables more hands-off userspace setup:
600 * (a) environment variable lets new-style hotplug events work once system is
601 * fully running: "modprobe $MODALIAS"
602 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
603 * mishandled before system is fully running: "modprobe $(cat modalias)"
605 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
608 struct platform_device *pdev = to_platform_device(dev);
609 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
611 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
614 static struct device_attribute platform_dev_attrs[] = {
619 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
621 struct platform_device *pdev = to_platform_device(dev);
624 /* Some devices have extra OF data and an OF-style MODALIAS */
625 rc = of_device_uevent_modalias(dev,env);
629 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
634 static const struct platform_device_id *platform_match_id(
635 const struct platform_device_id *id,
636 struct platform_device *pdev)
638 while (id->name[0]) {
639 if (strcmp(pdev->name, id->name) == 0) {
649 * platform_match - bind platform device to platform driver.
653 * Platform device IDs are assumed to be encoded like this:
654 * "<name><instance>", where <name> is a short description of the type of
655 * device, like "pci" or "floppy", and <instance> is the enumerated
656 * instance of the device, like '0' or '42'. Driver IDs are simply
657 * "<name>". So, extract the <name> from the platform_device structure,
658 * and compare it against the name of the driver. Return whether they match
661 static int platform_match(struct device *dev, struct device_driver *drv)
663 struct platform_device *pdev = to_platform_device(dev);
664 struct platform_driver *pdrv = to_platform_driver(drv);
666 /* Attempt an OF style match first */
667 if (of_driver_match_device(dev, drv))
670 /* Then try to match against the id table */
672 return platform_match_id(pdrv->id_table, pdev) != NULL;
674 /* fall-back to driver name match */
675 return (strcmp(pdev->name, drv->name) == 0);
678 #ifdef CONFIG_PM_SLEEP
680 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
682 struct platform_driver *pdrv = to_platform_driver(dev->driver);
683 struct platform_device *pdev = to_platform_device(dev);
686 if (dev->driver && pdrv->suspend)
687 ret = pdrv->suspend(pdev, mesg);
692 static int platform_legacy_resume(struct device *dev)
694 struct platform_driver *pdrv = to_platform_driver(dev->driver);
695 struct platform_device *pdev = to_platform_device(dev);
698 if (dev->driver && pdrv->resume)
699 ret = pdrv->resume(pdev);
704 #endif /* CONFIG_PM_SLEEP */
706 #ifdef CONFIG_SUSPEND
708 int platform_pm_suspend(struct device *dev)
710 struct device_driver *drv = dev->driver;
717 if (drv->pm->suspend)
718 ret = drv->pm->suspend(dev);
720 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
726 int platform_pm_resume(struct device *dev)
728 struct device_driver *drv = dev->driver;
736 ret = drv->pm->resume(dev);
738 ret = platform_legacy_resume(dev);
744 #endif /* CONFIG_SUSPEND */
746 #ifdef CONFIG_HIBERNATE_CALLBACKS
748 int platform_pm_freeze(struct device *dev)
750 struct device_driver *drv = dev->driver;
758 ret = drv->pm->freeze(dev);
760 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
766 int platform_pm_thaw(struct device *dev)
768 struct device_driver *drv = dev->driver;
776 ret = drv->pm->thaw(dev);
778 ret = platform_legacy_resume(dev);
784 int platform_pm_poweroff(struct device *dev)
786 struct device_driver *drv = dev->driver;
793 if (drv->pm->poweroff)
794 ret = drv->pm->poweroff(dev);
796 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
802 int platform_pm_restore(struct device *dev)
804 struct device_driver *drv = dev->driver;
811 if (drv->pm->restore)
812 ret = drv->pm->restore(dev);
814 ret = platform_legacy_resume(dev);
820 #endif /* CONFIG_HIBERNATE_CALLBACKS */
822 static const struct dev_pm_ops platform_dev_pm_ops = {
823 .runtime_suspend = pm_generic_runtime_suspend,
824 .runtime_resume = pm_generic_runtime_resume,
825 .runtime_idle = pm_generic_runtime_idle,
826 USE_PLATFORM_PM_SLEEP_OPS
829 struct bus_type platform_bus_type = {
831 .dev_attrs = platform_dev_attrs,
832 .match = platform_match,
833 .uevent = platform_uevent,
834 .pm = &platform_dev_pm_ops,
836 EXPORT_SYMBOL_GPL(platform_bus_type);
838 int __init platform_bus_init(void)
842 early_platform_cleanup();
844 error = device_register(&platform_bus);
847 error = bus_register(&platform_bus_type);
849 device_unregister(&platform_bus);
853 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
854 u64 dma_get_required_mask(struct device *dev)
856 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
857 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
860 if (!high_totalram) {
861 /* convert to mask just covering totalram */
862 low_totalram = (1 << (fls(low_totalram) - 1));
863 low_totalram += low_totalram - 1;
866 high_totalram = (1 << (fls(high_totalram) - 1));
867 high_totalram += high_totalram - 1;
868 mask = (((u64)high_totalram) << 32) + 0xffffffff;
872 EXPORT_SYMBOL_GPL(dma_get_required_mask);
875 static __initdata LIST_HEAD(early_platform_driver_list);
876 static __initdata LIST_HEAD(early_platform_device_list);
879 * early_platform_driver_register - register early platform driver
880 * @epdrv: early_platform driver structure
881 * @buf: string passed from early_param()
883 * Helper function for early_platform_init() / early_platform_init_buffer()
885 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
891 /* Simply add the driver to the end of the global list.
892 * Drivers will by default be put on the list in compiled-in order.
894 if (!epdrv->list.next) {
895 INIT_LIST_HEAD(&epdrv->list);
896 list_add_tail(&epdrv->list, &early_platform_driver_list);
899 /* If the user has specified device then make sure the driver
900 * gets prioritized. The driver of the last device specified on
901 * command line will be put first on the list.
903 n = strlen(epdrv->pdrv->driver.name);
904 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
905 list_move(&epdrv->list, &early_platform_driver_list);
907 /* Allow passing parameters after device name */
908 if (buf[n] == '\0' || buf[n] == ',')
909 epdrv->requested_id = -1;
911 epdrv->requested_id = simple_strtoul(&buf[n + 1],
914 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
915 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
918 n += strcspn(&buf[n + 1], ",") + 1;
924 if (epdrv->bufsize) {
925 memcpy(epdrv->buffer, &buf[n],
926 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
927 epdrv->buffer[epdrv->bufsize - 1] = '\0';
935 * early_platform_add_devices - adds a number of early platform devices
936 * @devs: array of early platform devices to add
937 * @num: number of early platform devices in array
939 * Used by early architecture code to register early platform devices and
940 * their platform data.
942 void __init early_platform_add_devices(struct platform_device **devs, int num)
947 /* simply add the devices to list */
948 for (i = 0; i < num; i++) {
951 if (!dev->devres_head.next) {
952 pm_runtime_early_init(dev);
953 INIT_LIST_HEAD(&dev->devres_head);
954 list_add_tail(&dev->devres_head,
955 &early_platform_device_list);
961 * early_platform_driver_register_all - register early platform drivers
962 * @class_str: string to identify early platform driver class
964 * Used by architecture code to register all early platform drivers
965 * for a certain class. If omitted then only early platform drivers
966 * with matching kernel command line class parameters will be registered.
968 void __init early_platform_driver_register_all(char *class_str)
970 /* The "class_str" parameter may or may not be present on the kernel
971 * command line. If it is present then there may be more than one
972 * matching parameter.
974 * Since we register our early platform drivers using early_param()
975 * we need to make sure that they also get registered in the case
976 * when the parameter is missing from the kernel command line.
978 * We use parse_early_options() to make sure the early_param() gets
979 * called at least once. The early_param() may be called more than
980 * once since the name of the preferred device may be specified on
981 * the kernel command line. early_platform_driver_register() handles
984 parse_early_options(class_str);
988 * early_platform_match - find early platform device matching driver
989 * @epdrv: early platform driver structure
990 * @id: id to match against
992 static __init struct platform_device *
993 early_platform_match(struct early_platform_driver *epdrv, int id)
995 struct platform_device *pd;
997 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
998 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1006 * early_platform_left - check if early platform driver has matching devices
1007 * @epdrv: early platform driver structure
1008 * @id: return true if id or above exists
1010 static __init int early_platform_left(struct early_platform_driver *epdrv,
1013 struct platform_device *pd;
1015 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1016 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1024 * early_platform_driver_probe_id - probe drivers matching class_str and id
1025 * @class_str: string to identify early platform driver class
1026 * @id: id to match against
1027 * @nr_probe: number of platform devices to successfully probe before exiting
1029 static int __init early_platform_driver_probe_id(char *class_str,
1033 struct early_platform_driver *epdrv;
1034 struct platform_device *match;
1039 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1040 /* only use drivers matching our class_str */
1041 if (strcmp(class_str, epdrv->class_str))
1045 match_id = epdrv->requested_id;
1050 left += early_platform_left(epdrv, id);
1052 /* skip requested id */
1053 switch (epdrv->requested_id) {
1054 case EARLY_PLATFORM_ID_ERROR:
1055 case EARLY_PLATFORM_ID_UNSET:
1058 if (epdrv->requested_id == id)
1059 match_id = EARLY_PLATFORM_ID_UNSET;
1064 case EARLY_PLATFORM_ID_ERROR:
1065 pr_warning("%s: unable to parse %s parameter\n",
1066 class_str, epdrv->pdrv->driver.name);
1068 case EARLY_PLATFORM_ID_UNSET:
1072 match = early_platform_match(epdrv, match_id);
1077 * Set up a sensible init_name to enable
1078 * dev_name() and others to be used before the
1079 * rest of the driver core is initialized.
1081 if (!match->dev.init_name && slab_is_available()) {
1082 if (match->id != -1)
1083 match->dev.init_name =
1084 kasprintf(GFP_KERNEL, "%s.%d",
1088 match->dev.init_name =
1089 kasprintf(GFP_KERNEL, "%s",
1092 if (!match->dev.init_name)
1096 if (epdrv->pdrv->probe(match))
1097 pr_warning("%s: unable to probe %s early.\n",
1098 class_str, match->name);
1114 * early_platform_driver_probe - probe a class of registered drivers
1115 * @class_str: string to identify early platform driver class
1116 * @nr_probe: number of platform devices to successfully probe before exiting
1117 * @user_only: only probe user specified early platform devices
1119 * Used by architecture code to probe registered early platform drivers
1120 * within a certain class. For probe to happen a registered early platform
1121 * device matching a registered early platform driver is needed.
1123 int __init early_platform_driver_probe(char *class_str,
1130 for (i = -2; n < nr_probe; i++) {
1131 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1146 * early_platform_cleanup - clean up early platform code
1148 void __init early_platform_cleanup(void)
1150 struct platform_device *pd, *pd2;
1152 /* clean up the devres list used to chain devices */
1153 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1155 list_del(&pd->dev.devres_head);
1156 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));