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_devic_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)
86 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
88 return r ? r->start : -ENXIO;
90 EXPORT_SYMBOL_GPL(platform_get_irq);
93 * platform_get_resource_byname - get a resource for a device by name
94 * @dev: platform device
95 * @type: resource type
96 * @name: resource name
98 struct resource *platform_get_resource_byname(struct platform_device *dev,
104 for (i = 0; i < dev->num_resources; i++) {
105 struct resource *r = &dev->resource[i];
107 if (type == resource_type(r) && !strcmp(r->name, name))
112 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
115 * platform_get_irq - get an IRQ for a device
116 * @dev: platform device
119 int platform_get_irq_byname(struct platform_device *dev, const char *name)
121 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
124 return r ? r->start : -ENXIO;
126 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
129 * platform_add_devices - add a numbers of platform devices
130 * @devs: array of platform devices to add
131 * @num: number of platform devices in array
133 int platform_add_devices(struct platform_device **devs, int num)
137 for (i = 0; i < num; i++) {
138 ret = platform_device_register(devs[i]);
141 platform_device_unregister(devs[i]);
148 EXPORT_SYMBOL_GPL(platform_add_devices);
150 struct platform_object {
151 struct platform_device pdev;
156 * platform_device_put - destroy a platform device
157 * @pdev: platform device to free
159 * Free all memory associated with a platform device. This function must
160 * _only_ be externally called in error cases. All other usage is a bug.
162 void platform_device_put(struct platform_device *pdev)
165 put_device(&pdev->dev);
167 EXPORT_SYMBOL_GPL(platform_device_put);
169 static void platform_device_release(struct device *dev)
171 struct platform_object *pa = container_of(dev, struct platform_object,
174 of_device_node_put(&pa->pdev.dev);
175 kfree(pa->pdev.dev.platform_data);
176 kfree(pa->pdev.mfd_cell);
177 kfree(pa->pdev.resource);
182 * platform_device_alloc - create a platform device
183 * @name: base name of the device we're adding
186 * Create a platform device object which can have other objects attached
187 * to it, and which will have attached objects freed when it is released.
189 struct platform_device *platform_device_alloc(const char *name, int id)
191 struct platform_object *pa;
193 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
195 strcpy(pa->name, name);
196 pa->pdev.name = pa->name;
198 device_initialize(&pa->pdev.dev);
199 pa->pdev.dev.release = platform_device_release;
200 arch_setup_pdev_archdata(&pa->pdev);
203 return pa ? &pa->pdev : NULL;
205 EXPORT_SYMBOL_GPL(platform_device_alloc);
208 * platform_device_add_resources - add resources to a platform device
209 * @pdev: platform device allocated by platform_device_alloc to add resources to
210 * @res: set of resources that needs to be allocated for the device
211 * @num: number of resources
213 * Add a copy of the resources to the platform device. The memory
214 * associated with the resources will be freed when the platform device is
217 int platform_device_add_resources(struct platform_device *pdev,
218 const struct resource *res, unsigned int num)
220 struct resource *r = NULL;
223 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
228 kfree(pdev->resource);
230 pdev->num_resources = num;
233 EXPORT_SYMBOL_GPL(platform_device_add_resources);
236 * platform_device_add_data - add platform-specific data to a platform device
237 * @pdev: platform device allocated by platform_device_alloc to add resources to
238 * @data: platform specific data for this platform device
239 * @size: size of platform specific data
241 * Add a copy of platform specific data to the platform device's
242 * platform_data pointer. The memory associated with the platform data
243 * will be freed when the platform device is released.
245 int platform_device_add_data(struct platform_device *pdev, const void *data,
251 d = kmemdup(data, size, GFP_KERNEL);
256 kfree(pdev->dev.platform_data);
257 pdev->dev.platform_data = d;
260 EXPORT_SYMBOL_GPL(platform_device_add_data);
263 * platform_device_add - add a platform device to device hierarchy
264 * @pdev: platform device we're adding
266 * This is part 2 of platform_device_register(), though may be called
267 * separately _iff_ pdev was allocated by platform_device_alloc().
269 int platform_device_add(struct platform_device *pdev)
276 if (!pdev->dev.parent)
277 pdev->dev.parent = &platform_bus;
279 pdev->dev.bus = &platform_bus_type;
283 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
285 case PLATFORM_DEVID_NONE:
286 dev_set_name(&pdev->dev, "%s", pdev->name);
288 case PLATFORM_DEVID_AUTO:
290 * Automatically allocated device ID. We mark it as such so
291 * that we remember it must be freed, and we append a suffix
292 * to avoid namespace collision with explicit IDs.
294 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
298 pdev->id_auto = true;
299 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
303 for (i = 0; i < pdev->num_resources; i++) {
304 struct resource *p, *r = &pdev->resource[i];
307 r->name = dev_name(&pdev->dev);
311 if (resource_type(r) == IORESOURCE_MEM)
313 else if (resource_type(r) == IORESOURCE_IO)
314 p = &ioport_resource;
317 if (p && insert_resource(p, r)) {
319 "%s: failed to claim resource %d\n",
320 dev_name(&pdev->dev), i);
326 pr_debug("Registering platform device '%s'. Parent at %s\n",
327 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
329 ret = device_add(&pdev->dev);
335 ida_simple_remove(&platform_devid_ida, pdev->id);
336 pdev->id = PLATFORM_DEVID_AUTO;
340 struct resource *r = &pdev->resource[i];
341 unsigned long type = resource_type(r);
343 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
350 EXPORT_SYMBOL_GPL(platform_device_add);
353 * platform_device_del - remove a platform-level device
354 * @pdev: platform device we're removing
356 * Note that this function will also release all memory- and port-based
357 * resources owned by the device (@dev->resource). This function must
358 * _only_ be externally called in error cases. All other usage is a bug.
360 void platform_device_del(struct platform_device *pdev)
365 device_del(&pdev->dev);
368 ida_simple_remove(&platform_devid_ida, pdev->id);
369 pdev->id = PLATFORM_DEVID_AUTO;
372 for (i = 0; i < pdev->num_resources; i++) {
373 struct resource *r = &pdev->resource[i];
374 unsigned long type = resource_type(r);
376 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
381 EXPORT_SYMBOL_GPL(platform_device_del);
384 * platform_device_register - add a platform-level device
385 * @pdev: platform device we're adding
387 int platform_device_register(struct platform_device *pdev)
389 device_initialize(&pdev->dev);
390 arch_setup_pdev_archdata(pdev);
391 return platform_device_add(pdev);
393 EXPORT_SYMBOL_GPL(platform_device_register);
396 * platform_device_unregister - unregister a platform-level device
397 * @pdev: platform device we're unregistering
399 * Unregistration is done in 2 steps. First we release all resources
400 * and remove it from the subsystem, then we drop reference count by
401 * calling platform_device_put().
403 void platform_device_unregister(struct platform_device *pdev)
405 platform_device_del(pdev);
406 platform_device_put(pdev);
408 EXPORT_SYMBOL_GPL(platform_device_unregister);
411 * platform_device_register_full - add a platform-level device with
412 * resources and platform-specific data
414 * @pdevinfo: data used to create device
416 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
418 struct platform_device *platform_device_register_full(
419 const struct platform_device_info *pdevinfo)
422 struct platform_device *pdev;
424 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
428 pdev->dev.parent = pdevinfo->parent;
430 if (pdevinfo->dma_mask) {
432 * This memory isn't freed when the device is put,
433 * I don't have a nice idea for that though. Conceptually
434 * dma_mask in struct device should not be a pointer.
435 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
438 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
439 if (!pdev->dev.dma_mask)
442 *pdev->dev.dma_mask = pdevinfo->dma_mask;
443 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
446 ret = platform_device_add_resources(pdev,
447 pdevinfo->res, pdevinfo->num_res);
451 ret = platform_device_add_data(pdev,
452 pdevinfo->data, pdevinfo->size_data);
456 ret = platform_device_add(pdev);
459 kfree(pdev->dev.dma_mask);
462 platform_device_put(pdev);
468 EXPORT_SYMBOL_GPL(platform_device_register_full);
470 static int platform_drv_probe(struct device *_dev)
472 struct platform_driver *drv = to_platform_driver(_dev->driver);
473 struct platform_device *dev = to_platform_device(_dev);
475 return drv->probe(dev);
478 static int platform_drv_probe_fail(struct device *_dev)
483 static int platform_drv_remove(struct device *_dev)
485 struct platform_driver *drv = to_platform_driver(_dev->driver);
486 struct platform_device *dev = to_platform_device(_dev);
488 return drv->remove(dev);
491 static void platform_drv_shutdown(struct device *_dev)
493 struct platform_driver *drv = to_platform_driver(_dev->driver);
494 struct platform_device *dev = to_platform_device(_dev);
500 * platform_driver_register - register a driver for platform-level devices
501 * @drv: platform driver structure
503 int platform_driver_register(struct platform_driver *drv)
505 drv->driver.bus = &platform_bus_type;
507 drv->driver.probe = platform_drv_probe;
509 drv->driver.remove = platform_drv_remove;
511 drv->driver.shutdown = platform_drv_shutdown;
513 return driver_register(&drv->driver);
515 EXPORT_SYMBOL_GPL(platform_driver_register);
518 * platform_driver_unregister - unregister a driver for platform-level devices
519 * @drv: platform driver structure
521 void platform_driver_unregister(struct platform_driver *drv)
523 driver_unregister(&drv->driver);
525 EXPORT_SYMBOL_GPL(platform_driver_unregister);
528 * platform_driver_probe - register driver for non-hotpluggable device
529 * @drv: platform driver structure
530 * @probe: the driver probe routine, probably from an __init section
532 * Use this instead of platform_driver_register() when you know the device
533 * is not hotpluggable and has already been registered, and you want to
534 * remove its run-once probe() infrastructure from memory after the driver
535 * has bound to the device.
537 * One typical use for this would be with drivers for controllers integrated
538 * into system-on-chip processors, where the controller devices have been
539 * configured as part of board setup.
541 * Returns zero if the driver registered and bound to a device, else returns
542 * a negative error code and with the driver not registered.
544 int __init_or_module platform_driver_probe(struct platform_driver *drv,
545 int (*probe)(struct platform_device *))
549 /* make sure driver won't have bind/unbind attributes */
550 drv->driver.suppress_bind_attrs = true;
552 /* temporary section violation during probe() */
554 retval = code = platform_driver_register(drv);
557 * Fixup that section violation, being paranoid about code scanning
558 * the list of drivers in order to probe new devices. Check to see
559 * if the probe was successful, and make sure any forced probes of
562 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
564 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
566 drv->driver.probe = platform_drv_probe_fail;
567 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
570 platform_driver_unregister(drv);
573 EXPORT_SYMBOL_GPL(platform_driver_probe);
576 * platform_create_bundle - register driver and create corresponding device
577 * @driver: platform driver structure
578 * @probe: the driver probe routine, probably from an __init section
579 * @res: set of resources that needs to be allocated for the device
580 * @n_res: number of resources
581 * @data: platform specific data for this platform device
582 * @size: size of platform specific data
584 * Use this in legacy-style modules that probe hardware directly and
585 * register a single platform device and corresponding platform driver.
587 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
589 struct platform_device * __init_or_module platform_create_bundle(
590 struct platform_driver *driver,
591 int (*probe)(struct platform_device *),
592 struct resource *res, unsigned int n_res,
593 const void *data, size_t size)
595 struct platform_device *pdev;
598 pdev = platform_device_alloc(driver->driver.name, -1);
604 error = platform_device_add_resources(pdev, res, n_res);
608 error = platform_device_add_data(pdev, data, size);
612 error = platform_device_add(pdev);
616 error = platform_driver_probe(driver, probe);
623 platform_device_del(pdev);
625 platform_device_put(pdev);
627 return ERR_PTR(error);
629 EXPORT_SYMBOL_GPL(platform_create_bundle);
631 /* modalias support enables more hands-off userspace setup:
632 * (a) environment variable lets new-style hotplug events work once system is
633 * fully running: "modprobe $MODALIAS"
634 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
635 * mishandled before system is fully running: "modprobe $(cat modalias)"
637 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
640 struct platform_device *pdev = to_platform_device(dev);
641 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
643 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
646 static struct device_attribute platform_dev_attrs[] = {
651 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
653 struct platform_device *pdev = to_platform_device(dev);
656 /* Some devices have extra OF data and an OF-style MODALIAS */
657 rc = of_device_uevent_modalias(dev,env);
661 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
666 static const struct platform_device_id *platform_match_id(
667 const struct platform_device_id *id,
668 struct platform_device *pdev)
670 while (id->name[0]) {
671 if (strcmp(pdev->name, id->name) == 0) {
681 * platform_match - bind platform device to platform driver.
685 * Platform device IDs are assumed to be encoded like this:
686 * "<name><instance>", where <name> is a short description of the type of
687 * device, like "pci" or "floppy", and <instance> is the enumerated
688 * instance of the device, like '0' or '42'. Driver IDs are simply
689 * "<name>". So, extract the <name> from the platform_device structure,
690 * and compare it against the name of the driver. Return whether they match
693 static int platform_match(struct device *dev, struct device_driver *drv)
695 struct platform_device *pdev = to_platform_device(dev);
696 struct platform_driver *pdrv = to_platform_driver(drv);
698 /* Attempt an OF style match first */
699 if (of_driver_match_device(dev, drv))
702 /* Then try to match against the id table */
704 return platform_match_id(pdrv->id_table, pdev) != NULL;
706 /* fall-back to driver name match */
707 return (strcmp(pdev->name, drv->name) == 0);
710 #ifdef CONFIG_PM_SLEEP
712 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
714 struct platform_driver *pdrv = to_platform_driver(dev->driver);
715 struct platform_device *pdev = to_platform_device(dev);
718 if (dev->driver && pdrv->suspend)
719 ret = pdrv->suspend(pdev, mesg);
724 static int platform_legacy_resume(struct device *dev)
726 struct platform_driver *pdrv = to_platform_driver(dev->driver);
727 struct platform_device *pdev = to_platform_device(dev);
730 if (dev->driver && pdrv->resume)
731 ret = pdrv->resume(pdev);
736 #endif /* CONFIG_PM_SLEEP */
738 #ifdef CONFIG_SUSPEND
740 int platform_pm_suspend(struct device *dev)
742 struct device_driver *drv = dev->driver;
749 if (drv->pm->suspend)
750 ret = drv->pm->suspend(dev);
752 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
758 int platform_pm_resume(struct device *dev)
760 struct device_driver *drv = dev->driver;
768 ret = drv->pm->resume(dev);
770 ret = platform_legacy_resume(dev);
776 #endif /* CONFIG_SUSPEND */
778 #ifdef CONFIG_HIBERNATE_CALLBACKS
780 int platform_pm_freeze(struct device *dev)
782 struct device_driver *drv = dev->driver;
790 ret = drv->pm->freeze(dev);
792 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
798 int platform_pm_thaw(struct device *dev)
800 struct device_driver *drv = dev->driver;
808 ret = drv->pm->thaw(dev);
810 ret = platform_legacy_resume(dev);
816 int platform_pm_poweroff(struct device *dev)
818 struct device_driver *drv = dev->driver;
825 if (drv->pm->poweroff)
826 ret = drv->pm->poweroff(dev);
828 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
834 int platform_pm_restore(struct device *dev)
836 struct device_driver *drv = dev->driver;
843 if (drv->pm->restore)
844 ret = drv->pm->restore(dev);
846 ret = platform_legacy_resume(dev);
852 #endif /* CONFIG_HIBERNATE_CALLBACKS */
854 static const struct dev_pm_ops platform_dev_pm_ops = {
855 .runtime_suspend = pm_generic_runtime_suspend,
856 .runtime_resume = pm_generic_runtime_resume,
857 .runtime_idle = pm_generic_runtime_idle,
858 USE_PLATFORM_PM_SLEEP_OPS
861 struct bus_type platform_bus_type = {
863 .dev_attrs = platform_dev_attrs,
864 .match = platform_match,
865 .uevent = platform_uevent,
866 .pm = &platform_dev_pm_ops,
868 EXPORT_SYMBOL_GPL(platform_bus_type);
870 int __init platform_bus_init(void)
874 early_platform_cleanup();
876 error = device_register(&platform_bus);
879 error = bus_register(&platform_bus_type);
881 device_unregister(&platform_bus);
885 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
886 u64 dma_get_required_mask(struct device *dev)
888 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
889 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
892 if (!high_totalram) {
893 /* convert to mask just covering totalram */
894 low_totalram = (1 << (fls(low_totalram) - 1));
895 low_totalram += low_totalram - 1;
898 high_totalram = (1 << (fls(high_totalram) - 1));
899 high_totalram += high_totalram - 1;
900 mask = (((u64)high_totalram) << 32) + 0xffffffff;
904 EXPORT_SYMBOL_GPL(dma_get_required_mask);
907 static __initdata LIST_HEAD(early_platform_driver_list);
908 static __initdata LIST_HEAD(early_platform_device_list);
911 * early_platform_driver_register - register early platform driver
912 * @epdrv: early_platform driver structure
913 * @buf: string passed from early_param()
915 * Helper function for early_platform_init() / early_platform_init_buffer()
917 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
923 /* Simply add the driver to the end of the global list.
924 * Drivers will by default be put on the list in compiled-in order.
926 if (!epdrv->list.next) {
927 INIT_LIST_HEAD(&epdrv->list);
928 list_add_tail(&epdrv->list, &early_platform_driver_list);
931 /* If the user has specified device then make sure the driver
932 * gets prioritized. The driver of the last device specified on
933 * command line will be put first on the list.
935 n = strlen(epdrv->pdrv->driver.name);
936 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
937 list_move(&epdrv->list, &early_platform_driver_list);
939 /* Allow passing parameters after device name */
940 if (buf[n] == '\0' || buf[n] == ',')
941 epdrv->requested_id = -1;
943 epdrv->requested_id = simple_strtoul(&buf[n + 1],
946 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
947 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
950 n += strcspn(&buf[n + 1], ",") + 1;
956 if (epdrv->bufsize) {
957 memcpy(epdrv->buffer, &buf[n],
958 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
959 epdrv->buffer[epdrv->bufsize - 1] = '\0';
967 * early_platform_add_devices - adds a number of early platform devices
968 * @devs: array of early platform devices to add
969 * @num: number of early platform devices in array
971 * Used by early architecture code to register early platform devices and
972 * their platform data.
974 void __init early_platform_add_devices(struct platform_device **devs, int num)
979 /* simply add the devices to list */
980 for (i = 0; i < num; i++) {
983 if (!dev->devres_head.next) {
984 pm_runtime_early_init(dev);
985 INIT_LIST_HEAD(&dev->devres_head);
986 list_add_tail(&dev->devres_head,
987 &early_platform_device_list);
993 * early_platform_driver_register_all - register early platform drivers
994 * @class_str: string to identify early platform driver class
996 * Used by architecture code to register all early platform drivers
997 * for a certain class. If omitted then only early platform drivers
998 * with matching kernel command line class parameters will be registered.
1000 void __init early_platform_driver_register_all(char *class_str)
1002 /* The "class_str" parameter may or may not be present on the kernel
1003 * command line. If it is present then there may be more than one
1004 * matching parameter.
1006 * Since we register our early platform drivers using early_param()
1007 * we need to make sure that they also get registered in the case
1008 * when the parameter is missing from the kernel command line.
1010 * We use parse_early_options() to make sure the early_param() gets
1011 * called at least once. The early_param() may be called more than
1012 * once since the name of the preferred device may be specified on
1013 * the kernel command line. early_platform_driver_register() handles
1016 parse_early_options(class_str);
1020 * early_platform_match - find early platform device matching driver
1021 * @epdrv: early platform driver structure
1022 * @id: id to match against
1024 static __init struct platform_device *
1025 early_platform_match(struct early_platform_driver *epdrv, int id)
1027 struct platform_device *pd;
1029 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1030 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1038 * early_platform_left - check if early platform driver has matching devices
1039 * @epdrv: early platform driver structure
1040 * @id: return true if id or above exists
1042 static __init int early_platform_left(struct early_platform_driver *epdrv,
1045 struct platform_device *pd;
1047 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1048 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1056 * early_platform_driver_probe_id - probe drivers matching class_str and id
1057 * @class_str: string to identify early platform driver class
1058 * @id: id to match against
1059 * @nr_probe: number of platform devices to successfully probe before exiting
1061 static int __init early_platform_driver_probe_id(char *class_str,
1065 struct early_platform_driver *epdrv;
1066 struct platform_device *match;
1071 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1072 /* only use drivers matching our class_str */
1073 if (strcmp(class_str, epdrv->class_str))
1077 match_id = epdrv->requested_id;
1082 left += early_platform_left(epdrv, id);
1084 /* skip requested id */
1085 switch (epdrv->requested_id) {
1086 case EARLY_PLATFORM_ID_ERROR:
1087 case EARLY_PLATFORM_ID_UNSET:
1090 if (epdrv->requested_id == id)
1091 match_id = EARLY_PLATFORM_ID_UNSET;
1096 case EARLY_PLATFORM_ID_ERROR:
1097 pr_warning("%s: unable to parse %s parameter\n",
1098 class_str, epdrv->pdrv->driver.name);
1100 case EARLY_PLATFORM_ID_UNSET:
1104 match = early_platform_match(epdrv, match_id);
1109 * Set up a sensible init_name to enable
1110 * dev_name() and others to be used before the
1111 * rest of the driver core is initialized.
1113 if (!match->dev.init_name && slab_is_available()) {
1114 if (match->id != -1)
1115 match->dev.init_name =
1116 kasprintf(GFP_KERNEL, "%s.%d",
1120 match->dev.init_name =
1121 kasprintf(GFP_KERNEL, "%s",
1124 if (!match->dev.init_name)
1128 if (epdrv->pdrv->probe(match))
1129 pr_warning("%s: unable to probe %s early.\n",
1130 class_str, match->name);
1146 * early_platform_driver_probe - probe a class of registered drivers
1147 * @class_str: string to identify early platform driver class
1148 * @nr_probe: number of platform devices to successfully probe before exiting
1149 * @user_only: only probe user specified early platform devices
1151 * Used by architecture code to probe registered early platform drivers
1152 * within a certain class. For probe to happen a registered early platform
1153 * device matching a registered early platform driver is needed.
1155 int __init early_platform_driver_probe(char *class_str,
1162 for (i = -2; n < nr_probe; i++) {
1163 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1178 * early_platform_cleanup - clean up early platform code
1180 void __init early_platform_cleanup(void)
1182 struct platform_device *pd, *pd2;
1184 /* clean up the devres list used to chain devices */
1185 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1187 list_del(&pd->dev.devres_head);
1188 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));