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>
23 #include <linux/idr.h>
26 #include "power/power.h"
28 /* For automatically allocated device IDs */
29 static DEFINE_IDA(platform_devid_ida);
31 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
34 struct device platform_bus = {
35 .init_name = "platform",
37 EXPORT_SYMBOL_GPL(platform_bus);
40 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
41 * @pdev: platform device
43 * This is called before platform_device_add() such that any pdev_archdata may
44 * be setup before the platform_notifier is called. So if a user needs to
45 * manipulate any relevant information in the pdev_archdata they can do:
47 * platform_device_alloc()
49 * platform_device_add()
51 * And if they don't care they can just call platform_device_register() and
52 * everything will just work out.
54 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
59 * platform_get_resource - get a resource for a device
60 * @dev: platform device
61 * @type: resource type
62 * @num: resource index
64 struct resource *platform_get_resource(struct platform_device *dev,
65 unsigned int type, unsigned int num)
69 for (i = 0; i < dev->num_resources; i++) {
70 struct resource *r = &dev->resource[i];
72 if (type == resource_type(r) && num-- == 0)
77 EXPORT_SYMBOL_GPL(platform_get_resource);
80 * platform_get_irq - get an IRQ for a device
81 * @dev: platform device
82 * @num: IRQ number index
84 int platform_get_irq(struct platform_device *dev, unsigned int num)
87 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
88 if (!dev || num >= dev->archdata.num_irqs)
90 return dev->archdata.irqs[num];
92 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
94 return r ? r->start : -ENXIO;
97 EXPORT_SYMBOL_GPL(platform_get_irq);
100 * platform_get_resource_byname - get a resource for a device by name
101 * @dev: platform device
102 * @type: resource type
103 * @name: resource name
105 struct resource *platform_get_resource_byname(struct platform_device *dev,
111 for (i = 0; i < dev->num_resources; i++) {
112 struct resource *r = &dev->resource[i];
114 if (unlikely(!r->name))
117 if (type == resource_type(r) && !strcmp(r->name, name))
122 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
125 * platform_get_irq - get an IRQ for a device
126 * @dev: platform device
129 int platform_get_irq_byname(struct platform_device *dev, const char *name)
131 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
134 return r ? r->start : -ENXIO;
136 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
139 * platform_add_devices - add a numbers of platform devices
140 * @devs: array of platform devices to add
141 * @num: number of platform devices in array
143 int platform_add_devices(struct platform_device **devs, int num)
147 for (i = 0; i < num; i++) {
148 ret = platform_device_register(devs[i]);
151 platform_device_unregister(devs[i]);
158 EXPORT_SYMBOL_GPL(platform_add_devices);
160 struct platform_object {
161 struct platform_device pdev;
166 * platform_device_put - destroy a platform device
167 * @pdev: platform device to free
169 * Free all memory associated with a platform device. This function must
170 * _only_ be externally called in error cases. All other usage is a bug.
172 void platform_device_put(struct platform_device *pdev)
175 put_device(&pdev->dev);
177 EXPORT_SYMBOL_GPL(platform_device_put);
179 static void platform_device_release(struct device *dev)
181 struct platform_object *pa = container_of(dev, struct platform_object,
184 of_device_node_put(&pa->pdev.dev);
185 kfree(pa->pdev.dev.platform_data);
186 kfree(pa->pdev.mfd_cell);
187 kfree(pa->pdev.resource);
192 * platform_device_alloc - create a platform device
193 * @name: base name of the device we're adding
196 * Create a platform device object which can have other objects attached
197 * to it, and which will have attached objects freed when it is released.
199 struct platform_device *platform_device_alloc(const char *name, int id)
201 struct platform_object *pa;
203 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
205 strcpy(pa->name, name);
206 pa->pdev.name = pa->name;
208 device_initialize(&pa->pdev.dev);
209 pa->pdev.dev.release = platform_device_release;
210 arch_setup_pdev_archdata(&pa->pdev);
213 return pa ? &pa->pdev : NULL;
215 EXPORT_SYMBOL_GPL(platform_device_alloc);
218 * platform_device_add_resources - add resources to a platform device
219 * @pdev: platform device allocated by platform_device_alloc to add resources to
220 * @res: set of resources that needs to be allocated for the device
221 * @num: number of resources
223 * Add a copy of the resources to the platform device. The memory
224 * associated with the resources will be freed when the platform device is
227 int platform_device_add_resources(struct platform_device *pdev,
228 const struct resource *res, unsigned int num)
230 struct resource *r = NULL;
233 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
238 kfree(pdev->resource);
240 pdev->num_resources = num;
243 EXPORT_SYMBOL_GPL(platform_device_add_resources);
246 * platform_device_add_data - add platform-specific data to a platform device
247 * @pdev: platform device allocated by platform_device_alloc to add resources to
248 * @data: platform specific data for this platform device
249 * @size: size of platform specific data
251 * Add a copy of platform specific data to the platform device's
252 * platform_data pointer. The memory associated with the platform data
253 * will be freed when the platform device is released.
255 int platform_device_add_data(struct platform_device *pdev, const void *data,
261 d = kmemdup(data, size, GFP_KERNEL);
266 kfree(pdev->dev.platform_data);
267 pdev->dev.platform_data = d;
270 EXPORT_SYMBOL_GPL(platform_device_add_data);
273 * platform_device_add - add a platform device to device hierarchy
274 * @pdev: platform device we're adding
276 * This is part 2 of platform_device_register(), though may be called
277 * separately _iff_ pdev was allocated by platform_device_alloc().
279 int platform_device_add(struct platform_device *pdev)
286 if (!pdev->dev.parent)
287 pdev->dev.parent = &platform_bus;
289 pdev->dev.bus = &platform_bus_type;
293 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
295 case PLATFORM_DEVID_NONE:
296 dev_set_name(&pdev->dev, "%s", pdev->name);
298 case PLATFORM_DEVID_AUTO:
300 * Automatically allocated device ID. We mark it as such so
301 * that we remember it must be freed, and we append a suffix
302 * to avoid namespace collision with explicit IDs.
304 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
308 pdev->id_auto = true;
309 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
313 for (i = 0; i < pdev->num_resources; i++) {
314 struct resource *p, *r = &pdev->resource[i];
317 r->name = dev_name(&pdev->dev);
321 if (resource_type(r) == IORESOURCE_MEM)
323 else if (resource_type(r) == IORESOURCE_IO)
324 p = &ioport_resource;
327 if (p && insert_resource(p, r)) {
329 "%s: failed to claim resource %d\n",
330 dev_name(&pdev->dev), i);
336 pr_debug("Registering platform device '%s'. Parent at %s\n",
337 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
339 ret = device_add(&pdev->dev);
345 ida_simple_remove(&platform_devid_ida, pdev->id);
346 pdev->id = PLATFORM_DEVID_AUTO;
350 struct resource *r = &pdev->resource[i];
351 unsigned long type = resource_type(r);
353 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
360 EXPORT_SYMBOL_GPL(platform_device_add);
363 * platform_device_del - remove a platform-level device
364 * @pdev: platform device we're removing
366 * Note that this function will also release all memory- and port-based
367 * resources owned by the device (@dev->resource). This function must
368 * _only_ be externally called in error cases. All other usage is a bug.
370 void platform_device_del(struct platform_device *pdev)
375 device_del(&pdev->dev);
378 ida_simple_remove(&platform_devid_ida, pdev->id);
379 pdev->id = PLATFORM_DEVID_AUTO;
382 for (i = 0; i < pdev->num_resources; i++) {
383 struct resource *r = &pdev->resource[i];
384 unsigned long type = resource_type(r);
386 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
391 EXPORT_SYMBOL_GPL(platform_device_del);
394 * platform_device_register - add a platform-level device
395 * @pdev: platform device we're adding
397 int platform_device_register(struct platform_device *pdev)
399 device_initialize(&pdev->dev);
400 arch_setup_pdev_archdata(pdev);
401 return platform_device_add(pdev);
403 EXPORT_SYMBOL_GPL(platform_device_register);
406 * platform_device_unregister - unregister a platform-level device
407 * @pdev: platform device we're unregistering
409 * Unregistration is done in 2 steps. First we release all resources
410 * and remove it from the subsystem, then we drop reference count by
411 * calling platform_device_put().
413 void platform_device_unregister(struct platform_device *pdev)
415 platform_device_del(pdev);
416 platform_device_put(pdev);
418 EXPORT_SYMBOL_GPL(platform_device_unregister);
421 * platform_device_register_full - add a platform-level device with
422 * resources and platform-specific data
424 * @pdevinfo: data used to create device
426 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
428 struct platform_device *platform_device_register_full(
429 const struct platform_device_info *pdevinfo)
432 struct platform_device *pdev;
434 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
438 pdev->dev.parent = pdevinfo->parent;
440 if (pdevinfo->dma_mask) {
442 * This memory isn't freed when the device is put,
443 * I don't have a nice idea for that though. Conceptually
444 * dma_mask in struct device should not be a pointer.
445 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
448 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
449 if (!pdev->dev.dma_mask)
452 *pdev->dev.dma_mask = pdevinfo->dma_mask;
453 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
456 ret = platform_device_add_resources(pdev,
457 pdevinfo->res, pdevinfo->num_res);
461 ret = platform_device_add_data(pdev,
462 pdevinfo->data, pdevinfo->size_data);
466 ret = platform_device_add(pdev);
469 kfree(pdev->dev.dma_mask);
472 platform_device_put(pdev);
478 EXPORT_SYMBOL_GPL(platform_device_register_full);
480 static int platform_drv_probe(struct device *_dev)
482 struct platform_driver *drv = to_platform_driver(_dev->driver);
483 struct platform_device *dev = to_platform_device(_dev);
485 return drv->probe(dev);
488 static int platform_drv_probe_fail(struct device *_dev)
493 static int platform_drv_remove(struct device *_dev)
495 struct platform_driver *drv = to_platform_driver(_dev->driver);
496 struct platform_device *dev = to_platform_device(_dev);
498 return drv->remove(dev);
501 static void platform_drv_shutdown(struct device *_dev)
503 struct platform_driver *drv = to_platform_driver(_dev->driver);
504 struct platform_device *dev = to_platform_device(_dev);
510 * platform_driver_register - register a driver for platform-level devices
511 * @drv: platform driver structure
513 int platform_driver_register(struct platform_driver *drv)
515 drv->driver.bus = &platform_bus_type;
517 drv->driver.probe = platform_drv_probe;
519 drv->driver.remove = platform_drv_remove;
521 drv->driver.shutdown = platform_drv_shutdown;
523 return driver_register(&drv->driver);
525 EXPORT_SYMBOL_GPL(platform_driver_register);
528 * platform_driver_unregister - unregister a driver for platform-level devices
529 * @drv: platform driver structure
531 void platform_driver_unregister(struct platform_driver *drv)
533 driver_unregister(&drv->driver);
535 EXPORT_SYMBOL_GPL(platform_driver_unregister);
538 * platform_driver_probe - register driver for non-hotpluggable device
539 * @drv: platform driver structure
540 * @probe: the driver probe routine, probably from an __init section
542 * Use this instead of platform_driver_register() when you know the device
543 * is not hotpluggable and has already been registered, and you want to
544 * remove its run-once probe() infrastructure from memory after the driver
545 * has bound to the device.
547 * One typical use for this would be with drivers for controllers integrated
548 * into system-on-chip processors, where the controller devices have been
549 * configured as part of board setup.
551 * Returns zero if the driver registered and bound to a device, else returns
552 * a negative error code and with the driver not registered.
554 int __init_or_module platform_driver_probe(struct platform_driver *drv,
555 int (*probe)(struct platform_device *))
559 /* make sure driver won't have bind/unbind attributes */
560 drv->driver.suppress_bind_attrs = true;
562 /* temporary section violation during probe() */
564 retval = code = platform_driver_register(drv);
567 * Fixup that section violation, being paranoid about code scanning
568 * the list of drivers in order to probe new devices. Check to see
569 * if the probe was successful, and make sure any forced probes of
572 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
574 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
576 drv->driver.probe = platform_drv_probe_fail;
577 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
580 platform_driver_unregister(drv);
583 EXPORT_SYMBOL_GPL(platform_driver_probe);
586 * platform_create_bundle - register driver and create corresponding device
587 * @driver: platform driver structure
588 * @probe: the driver probe routine, probably from an __init section
589 * @res: set of resources that needs to be allocated for the device
590 * @n_res: number of resources
591 * @data: platform specific data for this platform device
592 * @size: size of platform specific data
594 * Use this in legacy-style modules that probe hardware directly and
595 * register a single platform device and corresponding platform driver.
597 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
599 struct platform_device * __init_or_module platform_create_bundle(
600 struct platform_driver *driver,
601 int (*probe)(struct platform_device *),
602 struct resource *res, unsigned int n_res,
603 const void *data, size_t size)
605 struct platform_device *pdev;
608 pdev = platform_device_alloc(driver->driver.name, -1);
614 error = platform_device_add_resources(pdev, res, n_res);
618 error = platform_device_add_data(pdev, data, size);
622 error = platform_device_add(pdev);
626 error = platform_driver_probe(driver, probe);
633 platform_device_del(pdev);
635 platform_device_put(pdev);
637 return ERR_PTR(error);
639 EXPORT_SYMBOL_GPL(platform_create_bundle);
641 /* modalias support enables more hands-off userspace setup:
642 * (a) environment variable lets new-style hotplug events work once system is
643 * fully running: "modprobe $MODALIAS"
644 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
645 * mishandled before system is fully running: "modprobe $(cat modalias)"
647 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
650 struct platform_device *pdev = to_platform_device(dev);
651 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
653 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
656 static struct device_attribute platform_dev_attrs[] = {
661 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
663 struct platform_device *pdev = to_platform_device(dev);
666 /* Some devices have extra OF data and an OF-style MODALIAS */
667 rc = of_device_uevent_modalias(dev,env);
671 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
676 static const struct platform_device_id *platform_match_id(
677 const struct platform_device_id *id,
678 struct platform_device *pdev)
680 while (id->name[0]) {
681 if (strcmp(pdev->name, id->name) == 0) {
691 * platform_match - bind platform device to platform driver.
695 * Platform device IDs are assumed to be encoded like this:
696 * "<name><instance>", where <name> is a short description of the type of
697 * device, like "pci" or "floppy", and <instance> is the enumerated
698 * instance of the device, like '0' or '42'. Driver IDs are simply
699 * "<name>". So, extract the <name> from the platform_device structure,
700 * and compare it against the name of the driver. Return whether they match
703 static int platform_match(struct device *dev, struct device_driver *drv)
705 struct platform_device *pdev = to_platform_device(dev);
706 struct platform_driver *pdrv = to_platform_driver(drv);
708 /* Attempt an OF style match first */
709 if (of_driver_match_device(dev, drv))
712 /* Then try to match against the id table */
714 return platform_match_id(pdrv->id_table, pdev) != NULL;
716 /* fall-back to driver name match */
717 return (strcmp(pdev->name, drv->name) == 0);
720 #ifdef CONFIG_PM_SLEEP
722 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
724 struct platform_driver *pdrv = to_platform_driver(dev->driver);
725 struct platform_device *pdev = to_platform_device(dev);
728 if (dev->driver && pdrv->suspend)
729 ret = pdrv->suspend(pdev, mesg);
734 static int platform_legacy_resume(struct device *dev)
736 struct platform_driver *pdrv = to_platform_driver(dev->driver);
737 struct platform_device *pdev = to_platform_device(dev);
740 if (dev->driver && pdrv->resume)
741 ret = pdrv->resume(pdev);
746 #endif /* CONFIG_PM_SLEEP */
748 #ifdef CONFIG_SUSPEND
750 int platform_pm_suspend(struct device *dev)
752 struct device_driver *drv = dev->driver;
759 if (drv->pm->suspend)
760 ret = drv->pm->suspend(dev);
762 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
768 int platform_pm_resume(struct device *dev)
770 struct device_driver *drv = dev->driver;
778 ret = drv->pm->resume(dev);
780 ret = platform_legacy_resume(dev);
786 #endif /* CONFIG_SUSPEND */
788 #ifdef CONFIG_HIBERNATE_CALLBACKS
790 int platform_pm_freeze(struct device *dev)
792 struct device_driver *drv = dev->driver;
800 ret = drv->pm->freeze(dev);
802 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
808 int platform_pm_thaw(struct device *dev)
810 struct device_driver *drv = dev->driver;
818 ret = drv->pm->thaw(dev);
820 ret = platform_legacy_resume(dev);
826 int platform_pm_poweroff(struct device *dev)
828 struct device_driver *drv = dev->driver;
835 if (drv->pm->poweroff)
836 ret = drv->pm->poweroff(dev);
838 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
844 int platform_pm_restore(struct device *dev)
846 struct device_driver *drv = dev->driver;
853 if (drv->pm->restore)
854 ret = drv->pm->restore(dev);
856 ret = platform_legacy_resume(dev);
862 #endif /* CONFIG_HIBERNATE_CALLBACKS */
864 static const struct dev_pm_ops platform_dev_pm_ops = {
865 .runtime_suspend = pm_generic_runtime_suspend,
866 .runtime_resume = pm_generic_runtime_resume,
867 .runtime_idle = pm_generic_runtime_idle,
868 USE_PLATFORM_PM_SLEEP_OPS
871 struct bus_type platform_bus_type = {
873 .dev_attrs = platform_dev_attrs,
874 .match = platform_match,
875 .uevent = platform_uevent,
876 .pm = &platform_dev_pm_ops,
878 EXPORT_SYMBOL_GPL(platform_bus_type);
880 int __init platform_bus_init(void)
884 early_platform_cleanup();
886 error = device_register(&platform_bus);
889 error = bus_register(&platform_bus_type);
891 device_unregister(&platform_bus);
895 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
896 u64 dma_get_required_mask(struct device *dev)
898 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
899 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
902 if (!high_totalram) {
903 /* convert to mask just covering totalram */
904 low_totalram = (1 << (fls(low_totalram) - 1));
905 low_totalram += low_totalram - 1;
908 high_totalram = (1 << (fls(high_totalram) - 1));
909 high_totalram += high_totalram - 1;
910 mask = (((u64)high_totalram) << 32) + 0xffffffff;
914 EXPORT_SYMBOL_GPL(dma_get_required_mask);
917 static __initdata LIST_HEAD(early_platform_driver_list);
918 static __initdata LIST_HEAD(early_platform_device_list);
921 * early_platform_driver_register - register early platform driver
922 * @epdrv: early_platform driver structure
923 * @buf: string passed from early_param()
925 * Helper function for early_platform_init() / early_platform_init_buffer()
927 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
933 /* Simply add the driver to the end of the global list.
934 * Drivers will by default be put on the list in compiled-in order.
936 if (!epdrv->list.next) {
937 INIT_LIST_HEAD(&epdrv->list);
938 list_add_tail(&epdrv->list, &early_platform_driver_list);
941 /* If the user has specified device then make sure the driver
942 * gets prioritized. The driver of the last device specified on
943 * command line will be put first on the list.
945 n = strlen(epdrv->pdrv->driver.name);
946 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
947 list_move(&epdrv->list, &early_platform_driver_list);
949 /* Allow passing parameters after device name */
950 if (buf[n] == '\0' || buf[n] == ',')
951 epdrv->requested_id = -1;
953 epdrv->requested_id = simple_strtoul(&buf[n + 1],
956 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
957 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
960 n += strcspn(&buf[n + 1], ",") + 1;
966 if (epdrv->bufsize) {
967 memcpy(epdrv->buffer, &buf[n],
968 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
969 epdrv->buffer[epdrv->bufsize - 1] = '\0';
977 * early_platform_add_devices - adds a number of early platform devices
978 * @devs: array of early platform devices to add
979 * @num: number of early platform devices in array
981 * Used by early architecture code to register early platform devices and
982 * their platform data.
984 void __init early_platform_add_devices(struct platform_device **devs, int num)
989 /* simply add the devices to list */
990 for (i = 0; i < num; i++) {
993 if (!dev->devres_head.next) {
994 pm_runtime_early_init(dev);
995 INIT_LIST_HEAD(&dev->devres_head);
996 list_add_tail(&dev->devres_head,
997 &early_platform_device_list);
1003 * early_platform_driver_register_all - register early platform drivers
1004 * @class_str: string to identify early platform driver class
1006 * Used by architecture code to register all early platform drivers
1007 * for a certain class. If omitted then only early platform drivers
1008 * with matching kernel command line class parameters will be registered.
1010 void __init early_platform_driver_register_all(char *class_str)
1012 /* The "class_str" parameter may or may not be present on the kernel
1013 * command line. If it is present then there may be more than one
1014 * matching parameter.
1016 * Since we register our early platform drivers using early_param()
1017 * we need to make sure that they also get registered in the case
1018 * when the parameter is missing from the kernel command line.
1020 * We use parse_early_options() to make sure the early_param() gets
1021 * called at least once. The early_param() may be called more than
1022 * once since the name of the preferred device may be specified on
1023 * the kernel command line. early_platform_driver_register() handles
1026 parse_early_options(class_str);
1030 * early_platform_match - find early platform device matching driver
1031 * @epdrv: early platform driver structure
1032 * @id: id to match against
1034 static __init struct platform_device *
1035 early_platform_match(struct early_platform_driver *epdrv, int id)
1037 struct platform_device *pd;
1039 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1040 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1048 * early_platform_left - check if early platform driver has matching devices
1049 * @epdrv: early platform driver structure
1050 * @id: return true if id or above exists
1052 static __init int early_platform_left(struct early_platform_driver *epdrv,
1055 struct platform_device *pd;
1057 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1058 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1066 * early_platform_driver_probe_id - probe drivers matching class_str and id
1067 * @class_str: string to identify early platform driver class
1068 * @id: id to match against
1069 * @nr_probe: number of platform devices to successfully probe before exiting
1071 static int __init early_platform_driver_probe_id(char *class_str,
1075 struct early_platform_driver *epdrv;
1076 struct platform_device *match;
1081 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1082 /* only use drivers matching our class_str */
1083 if (strcmp(class_str, epdrv->class_str))
1087 match_id = epdrv->requested_id;
1092 left += early_platform_left(epdrv, id);
1094 /* skip requested id */
1095 switch (epdrv->requested_id) {
1096 case EARLY_PLATFORM_ID_ERROR:
1097 case EARLY_PLATFORM_ID_UNSET:
1100 if (epdrv->requested_id == id)
1101 match_id = EARLY_PLATFORM_ID_UNSET;
1106 case EARLY_PLATFORM_ID_ERROR:
1107 pr_warning("%s: unable to parse %s parameter\n",
1108 class_str, epdrv->pdrv->driver.name);
1110 case EARLY_PLATFORM_ID_UNSET:
1114 match = early_platform_match(epdrv, match_id);
1119 * Set up a sensible init_name to enable
1120 * dev_name() and others to be used before the
1121 * rest of the driver core is initialized.
1123 if (!match->dev.init_name && slab_is_available()) {
1124 if (match->id != -1)
1125 match->dev.init_name =
1126 kasprintf(GFP_KERNEL, "%s.%d",
1130 match->dev.init_name =
1131 kasprintf(GFP_KERNEL, "%s",
1134 if (!match->dev.init_name)
1138 if (epdrv->pdrv->probe(match))
1139 pr_warning("%s: unable to probe %s early.\n",
1140 class_str, match->name);
1156 * early_platform_driver_probe - probe a class of registered drivers
1157 * @class_str: string to identify early platform driver class
1158 * @nr_probe: number of platform devices to successfully probe before exiting
1159 * @user_only: only probe user specified early platform devices
1161 * Used by architecture code to probe registered early platform drivers
1162 * within a certain class. For probe to happen a registered early platform
1163 * device matching a registered early platform driver is needed.
1165 int __init early_platform_driver_probe(char *class_str,
1172 for (i = -2; n < nr_probe; i++) {
1173 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1188 * early_platform_cleanup - clean up early platform code
1190 void __init early_platform_cleanup(void)
1192 struct platform_device *pd, *pd2;
1194 /* clean up the devres list used to chain devices */
1195 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1197 list_del(&pd->dev.devres_head);
1198 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));