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>
27 /* For automatically allocated device IDs */
28 static DEFINE_IDA(platform_devid_ida);
30 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
33 struct device platform_bus = {
34 .init_name = "platform",
36 EXPORT_SYMBOL_GPL(platform_bus);
39 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
40 * @pdev: platform device
42 * This is called before platform_device_add() such that any pdev_archdata may
43 * be setup before the platform_notifier is called. So if a user needs to
44 * manipulate any relevant information in the pdev_archdata they can do:
46 * platform_devic_alloc()
48 * platform_device_add()
50 * And if they don't care they can just call platform_device_register() and
51 * everything will just work out.
53 void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
58 * platform_get_resource - get a resource for a device
59 * @dev: platform device
60 * @type: resource type
61 * @num: resource index
63 struct resource *platform_get_resource(struct platform_device *dev,
64 unsigned int type, unsigned int num)
68 for (i = 0; i < dev->num_resources; i++) {
69 struct resource *r = &dev->resource[i];
71 if (type == resource_type(r) && num-- == 0)
76 EXPORT_SYMBOL_GPL(platform_get_resource);
79 * platform_get_irq - get an IRQ for a device
80 * @dev: platform device
81 * @num: IRQ number index
83 int platform_get_irq(struct platform_device *dev, unsigned int num)
85 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
87 return r ? r->start : -ENXIO;
89 EXPORT_SYMBOL_GPL(platform_get_irq);
92 * platform_get_resource_byname - get a resource for a device by name
93 * @dev: platform device
94 * @type: resource type
95 * @name: resource name
97 struct resource *platform_get_resource_byname(struct platform_device *dev,
103 for (i = 0; i < dev->num_resources; i++) {
104 struct resource *r = &dev->resource[i];
106 if (unlikely(!r->name))
109 if (type == resource_type(r) && !strcmp(r->name, name))
114 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
117 * platform_get_irq - get an IRQ for a device
118 * @dev: platform device
121 int platform_get_irq_byname(struct platform_device *dev, const char *name)
123 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
126 return r ? r->start : -ENXIO;
128 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
131 * platform_add_devices - add a numbers of platform devices
132 * @devs: array of platform devices to add
133 * @num: number of platform devices in array
135 int platform_add_devices(struct platform_device **devs, int num)
139 for (i = 0; i < num; i++) {
140 ret = platform_device_register(devs[i]);
143 platform_device_unregister(devs[i]);
150 EXPORT_SYMBOL_GPL(platform_add_devices);
152 struct platform_object {
153 struct platform_device pdev;
158 * platform_device_put - destroy a platform device
159 * @pdev: platform device to free
161 * Free all memory associated with a platform device. This function must
162 * _only_ be externally called in error cases. All other usage is a bug.
164 void platform_device_put(struct platform_device *pdev)
167 put_device(&pdev->dev);
169 EXPORT_SYMBOL_GPL(platform_device_put);
171 static void platform_device_release(struct device *dev)
173 struct platform_object *pa = container_of(dev, struct platform_object,
176 of_device_node_put(&pa->pdev.dev);
177 kfree(pa->pdev.dev.platform_data);
178 kfree(pa->pdev.mfd_cell);
179 kfree(pa->pdev.resource);
184 * platform_device_alloc - create a platform device
185 * @name: base name of the device we're adding
188 * Create a platform device object which can have other objects attached
189 * to it, and which will have attached objects freed when it is released.
191 struct platform_device *platform_device_alloc(const char *name, int id)
193 struct platform_object *pa;
195 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
197 strcpy(pa->name, name);
198 pa->pdev.name = pa->name;
200 device_initialize(&pa->pdev.dev);
201 pa->pdev.dev.release = platform_device_release;
202 arch_setup_pdev_archdata(&pa->pdev);
205 return pa ? &pa->pdev : NULL;
207 EXPORT_SYMBOL_GPL(platform_device_alloc);
210 * platform_device_add_resources - add resources to a platform device
211 * @pdev: platform device allocated by platform_device_alloc to add resources to
212 * @res: set of resources that needs to be allocated for the device
213 * @num: number of resources
215 * Add a copy of the resources to the platform device. The memory
216 * associated with the resources will be freed when the platform device is
219 int platform_device_add_resources(struct platform_device *pdev,
220 const struct resource *res, unsigned int num)
222 struct resource *r = NULL;
225 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
230 kfree(pdev->resource);
232 pdev->num_resources = num;
235 EXPORT_SYMBOL_GPL(platform_device_add_resources);
238 * platform_device_add_data - add platform-specific data to a platform device
239 * @pdev: platform device allocated by platform_device_alloc to add resources to
240 * @data: platform specific data for this platform device
241 * @size: size of platform specific data
243 * Add a copy of platform specific data to the platform device's
244 * platform_data pointer. The memory associated with the platform data
245 * will be freed when the platform device is released.
247 int platform_device_add_data(struct platform_device *pdev, const void *data,
253 d = kmemdup(data, size, GFP_KERNEL);
258 kfree(pdev->dev.platform_data);
259 pdev->dev.platform_data = d;
262 EXPORT_SYMBOL_GPL(platform_device_add_data);
265 * platform_device_add - add a platform device to device hierarchy
266 * @pdev: platform device we're adding
268 * This is part 2 of platform_device_register(), though may be called
269 * separately _iff_ pdev was allocated by platform_device_alloc().
271 int platform_device_add(struct platform_device *pdev)
278 if (!pdev->dev.parent)
279 pdev->dev.parent = &platform_bus;
281 pdev->dev.bus = &platform_bus_type;
285 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
287 case PLATFORM_DEVID_NONE:
288 dev_set_name(&pdev->dev, "%s", pdev->name);
290 case PLATFORM_DEVID_AUTO:
292 * Automatically allocated device ID. We mark it as such so
293 * that we remember it must be freed, and we append a suffix
294 * to avoid namespace collision with explicit IDs.
296 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
300 pdev->id_auto = true;
301 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
305 for (i = 0; i < pdev->num_resources; i++) {
306 struct resource *p, *r = &pdev->resource[i];
309 r->name = dev_name(&pdev->dev);
313 if (resource_type(r) == IORESOURCE_MEM)
315 else if (resource_type(r) == IORESOURCE_IO)
316 p = &ioport_resource;
319 if (p && insert_resource(p, r)) {
321 "%s: failed to claim resource %d\n",
322 dev_name(&pdev->dev), i);
328 pr_debug("Registering platform device '%s'. Parent at %s\n",
329 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
331 ret = device_add(&pdev->dev);
337 ida_simple_remove(&platform_devid_ida, pdev->id);
338 pdev->id = PLATFORM_DEVID_AUTO;
342 struct resource *r = &pdev->resource[i];
343 unsigned long type = resource_type(r);
345 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
352 EXPORT_SYMBOL_GPL(platform_device_add);
355 * platform_device_del - remove a platform-level device
356 * @pdev: platform device we're removing
358 * Note that this function will also release all memory- and port-based
359 * resources owned by the device (@dev->resource). This function must
360 * _only_ be externally called in error cases. All other usage is a bug.
362 void platform_device_del(struct platform_device *pdev)
367 device_del(&pdev->dev);
370 ida_simple_remove(&platform_devid_ida, pdev->id);
371 pdev->id = PLATFORM_DEVID_AUTO;
374 for (i = 0; i < pdev->num_resources; i++) {
375 struct resource *r = &pdev->resource[i];
376 unsigned long type = resource_type(r);
378 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
383 EXPORT_SYMBOL_GPL(platform_device_del);
386 * platform_device_register - add a platform-level device
387 * @pdev: platform device we're adding
389 int platform_device_register(struct platform_device *pdev)
391 device_initialize(&pdev->dev);
392 arch_setup_pdev_archdata(pdev);
393 return platform_device_add(pdev);
395 EXPORT_SYMBOL_GPL(platform_device_register);
398 * platform_device_unregister - unregister a platform-level device
399 * @pdev: platform device we're unregistering
401 * Unregistration is done in 2 steps. First we release all resources
402 * and remove it from the subsystem, then we drop reference count by
403 * calling platform_device_put().
405 void platform_device_unregister(struct platform_device *pdev)
407 platform_device_del(pdev);
408 platform_device_put(pdev);
410 EXPORT_SYMBOL_GPL(platform_device_unregister);
413 * platform_device_register_full - add a platform-level device with
414 * resources and platform-specific data
416 * @pdevinfo: data used to create device
418 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
420 struct platform_device *platform_device_register_full(
421 const struct platform_device_info *pdevinfo)
424 struct platform_device *pdev;
426 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
430 pdev->dev.parent = pdevinfo->parent;
432 if (pdevinfo->dma_mask) {
434 * This memory isn't freed when the device is put,
435 * I don't have a nice idea for that though. Conceptually
436 * dma_mask in struct device should not be a pointer.
437 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
440 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
441 if (!pdev->dev.dma_mask)
444 *pdev->dev.dma_mask = pdevinfo->dma_mask;
445 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
448 ret = platform_device_add_resources(pdev,
449 pdevinfo->res, pdevinfo->num_res);
453 ret = platform_device_add_data(pdev,
454 pdevinfo->data, pdevinfo->size_data);
458 ret = platform_device_add(pdev);
461 kfree(pdev->dev.dma_mask);
464 platform_device_put(pdev);
470 EXPORT_SYMBOL_GPL(platform_device_register_full);
472 static int platform_drv_probe(struct device *_dev)
474 struct platform_driver *drv = to_platform_driver(_dev->driver);
475 struct platform_device *dev = to_platform_device(_dev);
477 return drv->probe(dev);
480 static int platform_drv_probe_fail(struct device *_dev)
485 static int platform_drv_remove(struct device *_dev)
487 struct platform_driver *drv = to_platform_driver(_dev->driver);
488 struct platform_device *dev = to_platform_device(_dev);
490 return drv->remove(dev);
493 static void platform_drv_shutdown(struct device *_dev)
495 struct platform_driver *drv = to_platform_driver(_dev->driver);
496 struct platform_device *dev = to_platform_device(_dev);
502 * platform_driver_register - register a driver for platform-level devices
503 * @drv: platform driver structure
505 int platform_driver_register(struct platform_driver *drv)
507 drv->driver.bus = &platform_bus_type;
509 drv->driver.probe = platform_drv_probe;
511 drv->driver.remove = platform_drv_remove;
513 drv->driver.shutdown = platform_drv_shutdown;
515 return driver_register(&drv->driver);
517 EXPORT_SYMBOL_GPL(platform_driver_register);
520 * platform_driver_unregister - unregister a driver for platform-level devices
521 * @drv: platform driver structure
523 void platform_driver_unregister(struct platform_driver *drv)
525 driver_unregister(&drv->driver);
527 EXPORT_SYMBOL_GPL(platform_driver_unregister);
530 * platform_driver_probe - register driver for non-hotpluggable device
531 * @drv: platform driver structure
532 * @probe: the driver probe routine, probably from an __init section
534 * Use this instead of platform_driver_register() when you know the device
535 * is not hotpluggable and has already been registered, and you want to
536 * remove its run-once probe() infrastructure from memory after the driver
537 * has bound to the device.
539 * One typical use for this would be with drivers for controllers integrated
540 * into system-on-chip processors, where the controller devices have been
541 * configured as part of board setup.
543 * Returns zero if the driver registered and bound to a device, else returns
544 * a negative error code and with the driver not registered.
546 int __init_or_module platform_driver_probe(struct platform_driver *drv,
547 int (*probe)(struct platform_device *))
551 /* make sure driver won't have bind/unbind attributes */
552 drv->driver.suppress_bind_attrs = true;
554 /* temporary section violation during probe() */
556 retval = code = platform_driver_register(drv);
559 * Fixup that section violation, being paranoid about code scanning
560 * the list of drivers in order to probe new devices. Check to see
561 * if the probe was successful, and make sure any forced probes of
564 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
566 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
568 drv->driver.probe = platform_drv_probe_fail;
569 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
572 platform_driver_unregister(drv);
575 EXPORT_SYMBOL_GPL(platform_driver_probe);
578 * platform_create_bundle - register driver and create corresponding device
579 * @driver: platform driver structure
580 * @probe: the driver probe routine, probably from an __init section
581 * @res: set of resources that needs to be allocated for the device
582 * @n_res: number of resources
583 * @data: platform specific data for this platform device
584 * @size: size of platform specific data
586 * Use this in legacy-style modules that probe hardware directly and
587 * register a single platform device and corresponding platform driver.
589 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
591 struct platform_device * __init_or_module platform_create_bundle(
592 struct platform_driver *driver,
593 int (*probe)(struct platform_device *),
594 struct resource *res, unsigned int n_res,
595 const void *data, size_t size)
597 struct platform_device *pdev;
600 pdev = platform_device_alloc(driver->driver.name, -1);
606 error = platform_device_add_resources(pdev, res, n_res);
610 error = platform_device_add_data(pdev, data, size);
614 error = platform_device_add(pdev);
618 error = platform_driver_probe(driver, probe);
625 platform_device_del(pdev);
627 platform_device_put(pdev);
629 return ERR_PTR(error);
631 EXPORT_SYMBOL_GPL(platform_create_bundle);
633 /* modalias support enables more hands-off userspace setup:
634 * (a) environment variable lets new-style hotplug events work once system is
635 * fully running: "modprobe $MODALIAS"
636 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
637 * mishandled before system is fully running: "modprobe $(cat modalias)"
639 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
642 struct platform_device *pdev = to_platform_device(dev);
643 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
645 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
648 static struct device_attribute platform_dev_attrs[] = {
653 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
655 struct platform_device *pdev = to_platform_device(dev);
658 /* Some devices have extra OF data and an OF-style MODALIAS */
659 rc = of_device_uevent_modalias(dev,env);
663 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
668 static const struct platform_device_id *platform_match_id(
669 const struct platform_device_id *id,
670 struct platform_device *pdev)
672 while (id->name[0]) {
673 if (strcmp(pdev->name, id->name) == 0) {
683 * platform_match - bind platform device to platform driver.
687 * Platform device IDs are assumed to be encoded like this:
688 * "<name><instance>", where <name> is a short description of the type of
689 * device, like "pci" or "floppy", and <instance> is the enumerated
690 * instance of the device, like '0' or '42'. Driver IDs are simply
691 * "<name>". So, extract the <name> from the platform_device structure,
692 * and compare it against the name of the driver. Return whether they match
695 static int platform_match(struct device *dev, struct device_driver *drv)
697 struct platform_device *pdev = to_platform_device(dev);
698 struct platform_driver *pdrv = to_platform_driver(drv);
700 /* Attempt an OF style match first */
701 if (of_driver_match_device(dev, drv))
704 /* Then try to match against the id table */
706 return platform_match_id(pdrv->id_table, pdev) != NULL;
708 /* fall-back to driver name match */
709 return (strcmp(pdev->name, drv->name) == 0);
712 #ifdef CONFIG_PM_SLEEP
714 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
716 struct platform_driver *pdrv = to_platform_driver(dev->driver);
717 struct platform_device *pdev = to_platform_device(dev);
720 if (dev->driver && pdrv->suspend)
721 ret = pdrv->suspend(pdev, mesg);
726 static int platform_legacy_resume(struct device *dev)
728 struct platform_driver *pdrv = to_platform_driver(dev->driver);
729 struct platform_device *pdev = to_platform_device(dev);
732 if (dev->driver && pdrv->resume)
733 ret = pdrv->resume(pdev);
738 #endif /* CONFIG_PM_SLEEP */
740 #ifdef CONFIG_SUSPEND
742 int platform_pm_suspend(struct device *dev)
744 struct device_driver *drv = dev->driver;
751 if (drv->pm->suspend)
752 ret = drv->pm->suspend(dev);
754 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
760 int platform_pm_resume(struct device *dev)
762 struct device_driver *drv = dev->driver;
770 ret = drv->pm->resume(dev);
772 ret = platform_legacy_resume(dev);
778 #endif /* CONFIG_SUSPEND */
780 #ifdef CONFIG_HIBERNATE_CALLBACKS
782 int platform_pm_freeze(struct device *dev)
784 struct device_driver *drv = dev->driver;
792 ret = drv->pm->freeze(dev);
794 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
800 int platform_pm_thaw(struct device *dev)
802 struct device_driver *drv = dev->driver;
810 ret = drv->pm->thaw(dev);
812 ret = platform_legacy_resume(dev);
818 int platform_pm_poweroff(struct device *dev)
820 struct device_driver *drv = dev->driver;
827 if (drv->pm->poweroff)
828 ret = drv->pm->poweroff(dev);
830 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
836 int platform_pm_restore(struct device *dev)
838 struct device_driver *drv = dev->driver;
845 if (drv->pm->restore)
846 ret = drv->pm->restore(dev);
848 ret = platform_legacy_resume(dev);
854 #endif /* CONFIG_HIBERNATE_CALLBACKS */
856 static const struct dev_pm_ops platform_dev_pm_ops = {
857 .runtime_suspend = pm_generic_runtime_suspend,
858 .runtime_resume = pm_generic_runtime_resume,
859 .runtime_idle = pm_generic_runtime_idle,
860 USE_PLATFORM_PM_SLEEP_OPS
863 struct bus_type platform_bus_type = {
865 .dev_attrs = platform_dev_attrs,
866 .match = platform_match,
867 .uevent = platform_uevent,
868 .pm = &platform_dev_pm_ops,
870 EXPORT_SYMBOL_GPL(platform_bus_type);
872 int __init platform_bus_init(void)
876 early_platform_cleanup();
878 error = device_register(&platform_bus);
881 error = bus_register(&platform_bus_type);
883 device_unregister(&platform_bus);
887 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
888 u64 dma_get_required_mask(struct device *dev)
890 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
891 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
894 if (!high_totalram) {
895 /* convert to mask just covering totalram */
896 low_totalram = (1 << (fls(low_totalram) - 1));
897 low_totalram += low_totalram - 1;
900 high_totalram = (1 << (fls(high_totalram) - 1));
901 high_totalram += high_totalram - 1;
902 mask = (((u64)high_totalram) << 32) + 0xffffffff;
906 EXPORT_SYMBOL_GPL(dma_get_required_mask);
909 static __initdata LIST_HEAD(early_platform_driver_list);
910 static __initdata LIST_HEAD(early_platform_device_list);
913 * early_platform_driver_register - register early platform driver
914 * @epdrv: early_platform driver structure
915 * @buf: string passed from early_param()
917 * Helper function for early_platform_init() / early_platform_init_buffer()
919 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
925 /* Simply add the driver to the end of the global list.
926 * Drivers will by default be put on the list in compiled-in order.
928 if (!epdrv->list.next) {
929 INIT_LIST_HEAD(&epdrv->list);
930 list_add_tail(&epdrv->list, &early_platform_driver_list);
933 /* If the user has specified device then make sure the driver
934 * gets prioritized. The driver of the last device specified on
935 * command line will be put first on the list.
937 n = strlen(epdrv->pdrv->driver.name);
938 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
939 list_move(&epdrv->list, &early_platform_driver_list);
941 /* Allow passing parameters after device name */
942 if (buf[n] == '\0' || buf[n] == ',')
943 epdrv->requested_id = -1;
945 epdrv->requested_id = simple_strtoul(&buf[n + 1],
948 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
949 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
952 n += strcspn(&buf[n + 1], ",") + 1;
958 if (epdrv->bufsize) {
959 memcpy(epdrv->buffer, &buf[n],
960 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
961 epdrv->buffer[epdrv->bufsize - 1] = '\0';
969 * early_platform_add_devices - adds a number of early platform devices
970 * @devs: array of early platform devices to add
971 * @num: number of early platform devices in array
973 * Used by early architecture code to register early platform devices and
974 * their platform data.
976 void __init early_platform_add_devices(struct platform_device **devs, int num)
981 /* simply add the devices to list */
982 for (i = 0; i < num; i++) {
985 if (!dev->devres_head.next) {
986 INIT_LIST_HEAD(&dev->devres_head);
987 list_add_tail(&dev->devres_head,
988 &early_platform_device_list);
994 * early_platform_driver_register_all - register early platform drivers
995 * @class_str: string to identify early platform driver class
997 * Used by architecture code to register all early platform drivers
998 * for a certain class. If omitted then only early platform drivers
999 * with matching kernel command line class parameters will be registered.
1001 void __init early_platform_driver_register_all(char *class_str)
1003 /* The "class_str" parameter may or may not be present on the kernel
1004 * command line. If it is present then there may be more than one
1005 * matching parameter.
1007 * Since we register our early platform drivers using early_param()
1008 * we need to make sure that they also get registered in the case
1009 * when the parameter is missing from the kernel command line.
1011 * We use parse_early_options() to make sure the early_param() gets
1012 * called at least once. The early_param() may be called more than
1013 * once since the name of the preferred device may be specified on
1014 * the kernel command line. early_platform_driver_register() handles
1017 parse_early_options(class_str);
1021 * early_platform_match - find early platform device matching driver
1022 * @epdrv: early platform driver structure
1023 * @id: id to match against
1025 static __init struct platform_device *
1026 early_platform_match(struct early_platform_driver *epdrv, int id)
1028 struct platform_device *pd;
1030 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1031 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1039 * early_platform_left - check if early platform driver has matching devices
1040 * @epdrv: early platform driver structure
1041 * @id: return true if id or above exists
1043 static __init int early_platform_left(struct early_platform_driver *epdrv,
1046 struct platform_device *pd;
1048 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1049 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1057 * early_platform_driver_probe_id - probe drivers matching class_str and id
1058 * @class_str: string to identify early platform driver class
1059 * @id: id to match against
1060 * @nr_probe: number of platform devices to successfully probe before exiting
1062 static int __init early_platform_driver_probe_id(char *class_str,
1066 struct early_platform_driver *epdrv;
1067 struct platform_device *match;
1072 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1073 /* only use drivers matching our class_str */
1074 if (strcmp(class_str, epdrv->class_str))
1078 match_id = epdrv->requested_id;
1083 left += early_platform_left(epdrv, id);
1085 /* skip requested id */
1086 switch (epdrv->requested_id) {
1087 case EARLY_PLATFORM_ID_ERROR:
1088 case EARLY_PLATFORM_ID_UNSET:
1091 if (epdrv->requested_id == id)
1092 match_id = EARLY_PLATFORM_ID_UNSET;
1097 case EARLY_PLATFORM_ID_ERROR:
1098 pr_warning("%s: unable to parse %s parameter\n",
1099 class_str, epdrv->pdrv->driver.name);
1101 case EARLY_PLATFORM_ID_UNSET:
1105 match = early_platform_match(epdrv, match_id);
1110 * Set up a sensible init_name to enable
1111 * dev_name() and others to be used before the
1112 * rest of the driver core is initialized.
1114 if (!match->dev.init_name && slab_is_available()) {
1115 if (match->id != -1)
1116 match->dev.init_name =
1117 kasprintf(GFP_KERNEL, "%s.%d",
1121 match->dev.init_name =
1122 kasprintf(GFP_KERNEL, "%s",
1125 if (!match->dev.init_name)
1129 if (epdrv->pdrv->probe(match))
1130 pr_warning("%s: unable to probe %s early.\n",
1131 class_str, match->name);
1147 * early_platform_driver_probe - probe a class of registered drivers
1148 * @class_str: string to identify early platform driver class
1149 * @nr_probe: number of platform devices to successfully probe before exiting
1150 * @user_only: only probe user specified early platform devices
1152 * Used by architecture code to probe registered early platform drivers
1153 * within a certain class. For probe to happen a registered early platform
1154 * device matching a registered early platform driver is needed.
1156 int __init early_platform_driver_probe(char *class_str,
1163 for (i = -2; n < nr_probe; i++) {
1164 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1179 * early_platform_cleanup - clean up early platform code
1181 void __init early_platform_cleanup(void)
1183 struct platform_device *pd, *pd2;
1185 /* clean up the devres list used to chain devices */
1186 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1188 list_del(&pd->dev.devres_head);
1189 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));