2 * platform.c - platform 'pseudo' bus for legacy devices
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
7 * This file is released under the GPLv2
9 * Please see Documentation/driver-model/platform.txt for more
13 #include <linux/string.h>
14 #include <linux/platform_device.h>
15 #include <linux/of_device.h>
16 #include <linux/of_irq.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/bootmem.h>
21 #include <linux/err.h>
22 #include <linux/slab.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/idr.h>
25 #include <linux/acpi.h>
26 #include <linux/clk/clk-conf.h>
29 #include "power/power.h"
31 /* For automatically allocated device IDs */
32 static DEFINE_IDA(platform_devid_ida);
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];
93 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
96 ret = of_irq_get(dev->dev.of_node, num);
97 if (ret >= 0 || ret == -EPROBE_DEFER)
101 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
103 return r ? r->start : -ENXIO;
106 EXPORT_SYMBOL_GPL(platform_get_irq);
109 * platform_get_resource_byname - get a resource for a device by name
110 * @dev: platform device
111 * @type: resource type
112 * @name: resource name
114 struct resource *platform_get_resource_byname(struct platform_device *dev,
120 for (i = 0; i < dev->num_resources; i++) {
121 struct resource *r = &dev->resource[i];
123 if (unlikely(!r->name))
126 if (type == resource_type(r) && !strcmp(r->name, name))
131 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
134 * platform_get_irq_byname - get an IRQ for a device by name
135 * @dev: platform device
138 int platform_get_irq_byname(struct platform_device *dev, const char *name)
140 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
143 return r ? r->start : -ENXIO;
145 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
148 * platform_add_devices - add a numbers of platform devices
149 * @devs: array of platform devices to add
150 * @num: number of platform devices in array
152 int platform_add_devices(struct platform_device **devs, int num)
156 for (i = 0; i < num; i++) {
157 ret = platform_device_register(devs[i]);
160 platform_device_unregister(devs[i]);
167 EXPORT_SYMBOL_GPL(platform_add_devices);
169 struct platform_object {
170 struct platform_device pdev;
175 * platform_device_put - destroy a platform device
176 * @pdev: platform device to free
178 * Free all memory associated with a platform device. This function must
179 * _only_ be externally called in error cases. All other usage is a bug.
181 void platform_device_put(struct platform_device *pdev)
184 put_device(&pdev->dev);
186 EXPORT_SYMBOL_GPL(platform_device_put);
188 static void platform_device_release(struct device *dev)
190 struct platform_object *pa = container_of(dev, struct platform_object,
193 of_device_node_put(&pa->pdev.dev);
194 kfree(pa->pdev.dev.platform_data);
195 kfree(pa->pdev.mfd_cell);
196 kfree(pa->pdev.resource);
201 * platform_device_alloc - create a platform device
202 * @name: base name of the device we're adding
205 * Create a platform device object which can have other objects attached
206 * to it, and which will have attached objects freed when it is released.
208 struct platform_device *platform_device_alloc(const char *name, int id)
210 struct platform_object *pa;
212 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
214 strcpy(pa->name, name);
215 pa->pdev.name = pa->name;
217 device_initialize(&pa->pdev.dev);
218 pa->pdev.dev.release = platform_device_release;
219 arch_setup_pdev_archdata(&pa->pdev);
222 return pa ? &pa->pdev : NULL;
224 EXPORT_SYMBOL_GPL(platform_device_alloc);
227 * platform_device_add_resources - add resources to a platform device
228 * @pdev: platform device allocated by platform_device_alloc to add resources to
229 * @res: set of resources that needs to be allocated for the device
230 * @num: number of resources
232 * Add a copy of the resources to the platform device. The memory
233 * associated with the resources will be freed when the platform device is
236 int platform_device_add_resources(struct platform_device *pdev,
237 const struct resource *res, unsigned int num)
239 struct resource *r = NULL;
242 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
247 kfree(pdev->resource);
249 pdev->num_resources = num;
252 EXPORT_SYMBOL_GPL(platform_device_add_resources);
255 * platform_device_add_data - add platform-specific data to a platform device
256 * @pdev: platform device allocated by platform_device_alloc to add resources to
257 * @data: platform specific data for this platform device
258 * @size: size of platform specific data
260 * Add a copy of platform specific data to the platform device's
261 * platform_data pointer. The memory associated with the platform data
262 * will be freed when the platform device is released.
264 int platform_device_add_data(struct platform_device *pdev, const void *data,
270 d = kmemdup(data, size, GFP_KERNEL);
275 kfree(pdev->dev.platform_data);
276 pdev->dev.platform_data = d;
279 EXPORT_SYMBOL_GPL(platform_device_add_data);
282 * platform_device_add - add a platform device to device hierarchy
283 * @pdev: platform device we're adding
285 * This is part 2 of platform_device_register(), though may be called
286 * separately _iff_ pdev was allocated by platform_device_alloc().
288 int platform_device_add(struct platform_device *pdev)
295 if (!pdev->dev.parent)
296 pdev->dev.parent = &platform_bus;
298 pdev->dev.bus = &platform_bus_type;
302 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
304 case PLATFORM_DEVID_NONE:
305 dev_set_name(&pdev->dev, "%s", pdev->name);
307 case PLATFORM_DEVID_AUTO:
309 * Automatically allocated device ID. We mark it as such so
310 * that we remember it must be freed, and we append a suffix
311 * to avoid namespace collision with explicit IDs.
313 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
317 pdev->id_auto = true;
318 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
322 for (i = 0; i < pdev->num_resources; i++) {
323 struct resource *p, *r = &pdev->resource[i];
326 r->name = dev_name(&pdev->dev);
330 if (resource_type(r) == IORESOURCE_MEM)
332 else if (resource_type(r) == IORESOURCE_IO)
333 p = &ioport_resource;
336 if (p && insert_resource(p, r)) {
337 dev_err(&pdev->dev, "failed to claim resource %d\n", i);
343 pr_debug("Registering platform device '%s'. Parent at %s\n",
344 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
346 ret = device_add(&pdev->dev);
352 ida_simple_remove(&platform_devid_ida, pdev->id);
353 pdev->id = PLATFORM_DEVID_AUTO;
357 struct resource *r = &pdev->resource[i];
358 unsigned long type = resource_type(r);
360 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
367 EXPORT_SYMBOL_GPL(platform_device_add);
370 * platform_device_del - remove a platform-level device
371 * @pdev: platform device we're removing
373 * Note that this function will also release all memory- and port-based
374 * resources owned by the device (@dev->resource). This function must
375 * _only_ be externally called in error cases. All other usage is a bug.
377 void platform_device_del(struct platform_device *pdev)
382 device_del(&pdev->dev);
385 ida_simple_remove(&platform_devid_ida, pdev->id);
386 pdev->id = PLATFORM_DEVID_AUTO;
389 for (i = 0; i < pdev->num_resources; i++) {
390 struct resource *r = &pdev->resource[i];
391 unsigned long type = resource_type(r);
393 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
398 EXPORT_SYMBOL_GPL(platform_device_del);
401 * platform_device_register - add a platform-level device
402 * @pdev: platform device we're adding
404 int platform_device_register(struct platform_device *pdev)
406 device_initialize(&pdev->dev);
407 arch_setup_pdev_archdata(pdev);
408 return platform_device_add(pdev);
410 EXPORT_SYMBOL_GPL(platform_device_register);
413 * platform_device_unregister - unregister a platform-level device
414 * @pdev: platform device we're unregistering
416 * Unregistration is done in 2 steps. First we release all resources
417 * and remove it from the subsystem, then we drop reference count by
418 * calling platform_device_put().
420 void platform_device_unregister(struct platform_device *pdev)
422 platform_device_del(pdev);
423 platform_device_put(pdev);
425 EXPORT_SYMBOL_GPL(platform_device_unregister);
428 * platform_device_register_full - add a platform-level device with
429 * resources and platform-specific data
431 * @pdevinfo: data used to create device
433 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
435 struct platform_device *platform_device_register_full(
436 const struct platform_device_info *pdevinfo)
439 struct platform_device *pdev;
441 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
445 pdev->dev.parent = pdevinfo->parent;
446 ACPI_COMPANION_SET(&pdev->dev, pdevinfo->acpi_node.companion);
448 if (pdevinfo->dma_mask) {
450 * This memory isn't freed when the device is put,
451 * I don't have a nice idea for that though. Conceptually
452 * dma_mask in struct device should not be a pointer.
453 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
456 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
457 if (!pdev->dev.dma_mask)
460 *pdev->dev.dma_mask = pdevinfo->dma_mask;
461 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
464 ret = platform_device_add_resources(pdev,
465 pdevinfo->res, pdevinfo->num_res);
469 ret = platform_device_add_data(pdev,
470 pdevinfo->data, pdevinfo->size_data);
474 ret = platform_device_add(pdev);
477 ACPI_COMPANION_SET(&pdev->dev, NULL);
478 kfree(pdev->dev.dma_mask);
481 platform_device_put(pdev);
487 EXPORT_SYMBOL_GPL(platform_device_register_full);
489 static int platform_drv_probe(struct device *_dev)
491 struct platform_driver *drv = to_platform_driver(_dev->driver);
492 struct platform_device *dev = to_platform_device(_dev);
495 ret = of_clk_set_defaults(_dev->of_node, false);
499 ret = dev_pm_domain_attach(_dev, true);
500 if (ret != -EPROBE_DEFER) {
501 ret = drv->probe(dev);
503 dev_pm_domain_detach(_dev, true);
506 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
507 dev_warn(_dev, "probe deferral not supported\n");
514 static int platform_drv_probe_fail(struct device *_dev)
519 static int platform_drv_remove(struct device *_dev)
521 struct platform_driver *drv = to_platform_driver(_dev->driver);
522 struct platform_device *dev = to_platform_device(_dev);
525 ret = drv->remove(dev);
526 dev_pm_domain_detach(_dev, true);
531 static void platform_drv_shutdown(struct device *_dev)
533 struct platform_driver *drv = to_platform_driver(_dev->driver);
534 struct platform_device *dev = to_platform_device(_dev);
537 dev_pm_domain_detach(_dev, true);
541 * __platform_driver_register - register a driver for platform-level devices
542 * @drv: platform driver structure
543 * @owner: owning module/driver
545 int __platform_driver_register(struct platform_driver *drv,
546 struct module *owner)
548 drv->driver.owner = owner;
549 drv->driver.bus = &platform_bus_type;
551 drv->driver.probe = platform_drv_probe;
553 drv->driver.remove = platform_drv_remove;
555 drv->driver.shutdown = platform_drv_shutdown;
557 return driver_register(&drv->driver);
559 EXPORT_SYMBOL_GPL(__platform_driver_register);
562 * platform_driver_unregister - unregister a driver for platform-level devices
563 * @drv: platform driver structure
565 void platform_driver_unregister(struct platform_driver *drv)
567 driver_unregister(&drv->driver);
569 EXPORT_SYMBOL_GPL(platform_driver_unregister);
572 * platform_driver_probe - register driver for non-hotpluggable device
573 * @drv: platform driver structure
574 * @probe: the driver probe routine, probably from an __init section
576 * Use this instead of platform_driver_register() when you know the device
577 * is not hotpluggable and has already been registered, and you want to
578 * remove its run-once probe() infrastructure from memory after the driver
579 * has bound to the device.
581 * One typical use for this would be with drivers for controllers integrated
582 * into system-on-chip processors, where the controller devices have been
583 * configured as part of board setup.
585 * Note that this is incompatible with deferred probing.
587 * Returns zero if the driver registered and bound to a device, else returns
588 * a negative error code and with the driver not registered.
590 int __init_or_module platform_driver_probe(struct platform_driver *drv,
591 int (*probe)(struct platform_device *))
596 * Prevent driver from requesting probe deferral to avoid further
597 * futile probe attempts.
599 drv->prevent_deferred_probe = true;
601 /* make sure driver won't have bind/unbind attributes */
602 drv->driver.suppress_bind_attrs = true;
604 /* temporary section violation during probe() */
606 retval = code = platform_driver_register(drv);
609 * Fixup that section violation, being paranoid about code scanning
610 * the list of drivers in order to probe new devices. Check to see
611 * if the probe was successful, and make sure any forced probes of
614 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
616 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
618 drv->driver.probe = platform_drv_probe_fail;
619 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
622 platform_driver_unregister(drv);
625 EXPORT_SYMBOL_GPL(platform_driver_probe);
628 * platform_create_bundle - register driver and create corresponding device
629 * @driver: platform driver structure
630 * @probe: the driver probe routine, probably from an __init section
631 * @res: set of resources that needs to be allocated for the device
632 * @n_res: number of resources
633 * @data: platform specific data for this platform device
634 * @size: size of platform specific data
636 * Use this in legacy-style modules that probe hardware directly and
637 * register a single platform device and corresponding platform driver.
639 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
641 struct platform_device * __init_or_module platform_create_bundle(
642 struct platform_driver *driver,
643 int (*probe)(struct platform_device *),
644 struct resource *res, unsigned int n_res,
645 const void *data, size_t size)
647 struct platform_device *pdev;
650 pdev = platform_device_alloc(driver->driver.name, -1);
656 error = platform_device_add_resources(pdev, res, n_res);
660 error = platform_device_add_data(pdev, data, size);
664 error = platform_device_add(pdev);
668 error = platform_driver_probe(driver, probe);
675 platform_device_del(pdev);
677 platform_device_put(pdev);
679 return ERR_PTR(error);
681 EXPORT_SYMBOL_GPL(platform_create_bundle);
683 /* modalias support enables more hands-off userspace setup:
684 * (a) environment variable lets new-style hotplug events work once system is
685 * fully running: "modprobe $MODALIAS"
686 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
687 * mishandled before system is fully running: "modprobe $(cat modalias)"
689 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
692 struct platform_device *pdev = to_platform_device(dev);
695 len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
699 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
703 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
705 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
707 static DEVICE_ATTR_RO(modalias);
709 static struct attribute *platform_dev_attrs[] = {
710 &dev_attr_modalias.attr,
713 ATTRIBUTE_GROUPS(platform_dev);
715 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
717 struct platform_device *pdev = to_platform_device(dev);
720 /* Some devices have extra OF data and an OF-style MODALIAS */
721 rc = of_device_uevent_modalias(dev, env);
725 rc = acpi_device_uevent_modalias(dev, env);
729 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
734 static const struct platform_device_id *platform_match_id(
735 const struct platform_device_id *id,
736 struct platform_device *pdev)
738 while (id->name[0]) {
739 if (strcmp(pdev->name, id->name) == 0) {
749 * platform_match - bind platform device to platform driver.
753 * Platform device IDs are assumed to be encoded like this:
754 * "<name><instance>", where <name> is a short description of the type of
755 * device, like "pci" or "floppy", and <instance> is the enumerated
756 * instance of the device, like '0' or '42'. Driver IDs are simply
757 * "<name>". So, extract the <name> from the platform_device structure,
758 * and compare it against the name of the driver. Return whether they match
761 static int platform_match(struct device *dev, struct device_driver *drv)
763 struct platform_device *pdev = to_platform_device(dev);
764 struct platform_driver *pdrv = to_platform_driver(drv);
766 /* Attempt an OF style match first */
767 if (of_driver_match_device(dev, drv))
770 /* Then try ACPI style match */
771 if (acpi_driver_match_device(dev, drv))
774 /* Then try to match against the id table */
776 return platform_match_id(pdrv->id_table, pdev) != NULL;
778 /* fall-back to driver name match */
779 return (strcmp(pdev->name, drv->name) == 0);
782 #ifdef CONFIG_PM_SLEEP
784 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
786 struct platform_driver *pdrv = to_platform_driver(dev->driver);
787 struct platform_device *pdev = to_platform_device(dev);
790 if (dev->driver && pdrv->suspend)
791 ret = pdrv->suspend(pdev, mesg);
796 static int platform_legacy_resume(struct device *dev)
798 struct platform_driver *pdrv = to_platform_driver(dev->driver);
799 struct platform_device *pdev = to_platform_device(dev);
802 if (dev->driver && pdrv->resume)
803 ret = pdrv->resume(pdev);
808 #endif /* CONFIG_PM_SLEEP */
810 #ifdef CONFIG_SUSPEND
812 int platform_pm_suspend(struct device *dev)
814 struct device_driver *drv = dev->driver;
821 if (drv->pm->suspend)
822 ret = drv->pm->suspend(dev);
824 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
830 int platform_pm_resume(struct device *dev)
832 struct device_driver *drv = dev->driver;
840 ret = drv->pm->resume(dev);
842 ret = platform_legacy_resume(dev);
848 #endif /* CONFIG_SUSPEND */
850 #ifdef CONFIG_HIBERNATE_CALLBACKS
852 int platform_pm_freeze(struct device *dev)
854 struct device_driver *drv = dev->driver;
862 ret = drv->pm->freeze(dev);
864 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
870 int platform_pm_thaw(struct device *dev)
872 struct device_driver *drv = dev->driver;
880 ret = drv->pm->thaw(dev);
882 ret = platform_legacy_resume(dev);
888 int platform_pm_poweroff(struct device *dev)
890 struct device_driver *drv = dev->driver;
897 if (drv->pm->poweroff)
898 ret = drv->pm->poweroff(dev);
900 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
906 int platform_pm_restore(struct device *dev)
908 struct device_driver *drv = dev->driver;
915 if (drv->pm->restore)
916 ret = drv->pm->restore(dev);
918 ret = platform_legacy_resume(dev);
924 #endif /* CONFIG_HIBERNATE_CALLBACKS */
926 static const struct dev_pm_ops platform_dev_pm_ops = {
927 .runtime_suspend = pm_generic_runtime_suspend,
928 .runtime_resume = pm_generic_runtime_resume,
929 USE_PLATFORM_PM_SLEEP_OPS
932 struct bus_type platform_bus_type = {
934 .dev_groups = platform_dev_groups,
935 .match = platform_match,
936 .uevent = platform_uevent,
937 .pm = &platform_dev_pm_ops,
939 EXPORT_SYMBOL_GPL(platform_bus_type);
941 int __init platform_bus_init(void)
945 early_platform_cleanup();
947 error = device_register(&platform_bus);
950 error = bus_register(&platform_bus_type);
952 device_unregister(&platform_bus);
956 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
957 u64 dma_get_required_mask(struct device *dev)
959 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
960 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
963 if (!high_totalram) {
964 /* convert to mask just covering totalram */
965 low_totalram = (1 << (fls(low_totalram) - 1));
966 low_totalram += low_totalram - 1;
969 high_totalram = (1 << (fls(high_totalram) - 1));
970 high_totalram += high_totalram - 1;
971 mask = (((u64)high_totalram) << 32) + 0xffffffff;
975 EXPORT_SYMBOL_GPL(dma_get_required_mask);
978 static __initdata LIST_HEAD(early_platform_driver_list);
979 static __initdata LIST_HEAD(early_platform_device_list);
982 * early_platform_driver_register - register early platform driver
983 * @epdrv: early_platform driver structure
984 * @buf: string passed from early_param()
986 * Helper function for early_platform_init() / early_platform_init_buffer()
988 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
994 /* Simply add the driver to the end of the global list.
995 * Drivers will by default be put on the list in compiled-in order.
997 if (!epdrv->list.next) {
998 INIT_LIST_HEAD(&epdrv->list);
999 list_add_tail(&epdrv->list, &early_platform_driver_list);
1002 /* If the user has specified device then make sure the driver
1003 * gets prioritized. The driver of the last device specified on
1004 * command line will be put first on the list.
1006 n = strlen(epdrv->pdrv->driver.name);
1007 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1008 list_move(&epdrv->list, &early_platform_driver_list);
1010 /* Allow passing parameters after device name */
1011 if (buf[n] == '\0' || buf[n] == ',')
1012 epdrv->requested_id = -1;
1014 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1017 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1018 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1021 n += strcspn(&buf[n + 1], ",") + 1;
1027 if (epdrv->bufsize) {
1028 memcpy(epdrv->buffer, &buf[n],
1029 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1030 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1038 * early_platform_add_devices - adds a number of early platform devices
1039 * @devs: array of early platform devices to add
1040 * @num: number of early platform devices in array
1042 * Used by early architecture code to register early platform devices and
1043 * their platform data.
1045 void __init early_platform_add_devices(struct platform_device **devs, int num)
1050 /* simply add the devices to list */
1051 for (i = 0; i < num; i++) {
1052 dev = &devs[i]->dev;
1054 if (!dev->devres_head.next) {
1055 pm_runtime_early_init(dev);
1056 INIT_LIST_HEAD(&dev->devres_head);
1057 list_add_tail(&dev->devres_head,
1058 &early_platform_device_list);
1064 * early_platform_driver_register_all - register early platform drivers
1065 * @class_str: string to identify early platform driver class
1067 * Used by architecture code to register all early platform drivers
1068 * for a certain class. If omitted then only early platform drivers
1069 * with matching kernel command line class parameters will be registered.
1071 void __init early_platform_driver_register_all(char *class_str)
1073 /* The "class_str" parameter may or may not be present on the kernel
1074 * command line. If it is present then there may be more than one
1075 * matching parameter.
1077 * Since we register our early platform drivers using early_param()
1078 * we need to make sure that they also get registered in the case
1079 * when the parameter is missing from the kernel command line.
1081 * We use parse_early_options() to make sure the early_param() gets
1082 * called at least once. The early_param() may be called more than
1083 * once since the name of the preferred device may be specified on
1084 * the kernel command line. early_platform_driver_register() handles
1087 parse_early_options(class_str);
1091 * early_platform_match - find early platform device matching driver
1092 * @epdrv: early platform driver structure
1093 * @id: id to match against
1095 static struct platform_device * __init
1096 early_platform_match(struct early_platform_driver *epdrv, int id)
1098 struct platform_device *pd;
1100 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1101 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1109 * early_platform_left - check if early platform driver has matching devices
1110 * @epdrv: early platform driver structure
1111 * @id: return true if id or above exists
1113 static int __init early_platform_left(struct early_platform_driver *epdrv,
1116 struct platform_device *pd;
1118 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1119 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1127 * early_platform_driver_probe_id - probe drivers matching class_str and id
1128 * @class_str: string to identify early platform driver class
1129 * @id: id to match against
1130 * @nr_probe: number of platform devices to successfully probe before exiting
1132 static int __init early_platform_driver_probe_id(char *class_str,
1136 struct early_platform_driver *epdrv;
1137 struct platform_device *match;
1142 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1143 /* only use drivers matching our class_str */
1144 if (strcmp(class_str, epdrv->class_str))
1148 match_id = epdrv->requested_id;
1153 left += early_platform_left(epdrv, id);
1155 /* skip requested id */
1156 switch (epdrv->requested_id) {
1157 case EARLY_PLATFORM_ID_ERROR:
1158 case EARLY_PLATFORM_ID_UNSET:
1161 if (epdrv->requested_id == id)
1162 match_id = EARLY_PLATFORM_ID_UNSET;
1167 case EARLY_PLATFORM_ID_ERROR:
1168 pr_warn("%s: unable to parse %s parameter\n",
1169 class_str, epdrv->pdrv->driver.name);
1171 case EARLY_PLATFORM_ID_UNSET:
1175 match = early_platform_match(epdrv, match_id);
1180 * Set up a sensible init_name to enable
1181 * dev_name() and others to be used before the
1182 * rest of the driver core is initialized.
1184 if (!match->dev.init_name && slab_is_available()) {
1185 if (match->id != -1)
1186 match->dev.init_name =
1187 kasprintf(GFP_KERNEL, "%s.%d",
1191 match->dev.init_name =
1192 kasprintf(GFP_KERNEL, "%s",
1195 if (!match->dev.init_name)
1199 if (epdrv->pdrv->probe(match))
1200 pr_warn("%s: unable to probe %s early.\n",
1201 class_str, match->name);
1217 * early_platform_driver_probe - probe a class of registered drivers
1218 * @class_str: string to identify early platform driver class
1219 * @nr_probe: number of platform devices to successfully probe before exiting
1220 * @user_only: only probe user specified early platform devices
1222 * Used by architecture code to probe registered early platform drivers
1223 * within a certain class. For probe to happen a registered early platform
1224 * device matching a registered early platform driver is needed.
1226 int __init early_platform_driver_probe(char *class_str,
1233 for (i = -2; n < nr_probe; i++) {
1234 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1249 * early_platform_cleanup - clean up early platform code
1251 void __init early_platform_cleanup(void)
1253 struct platform_device *pd, *pd2;
1255 /* clean up the devres list used to chain devices */
1256 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1258 list_del(&pd->dev.devres_head);
1259 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));