ALSA: hda - Add static_hdmi_pcm option to HDMI codec parser
[linux-2.6/next.git] / drivers / base / platform.c
blobf051cfff18afe2e703bc6383d8b6277cdc652401
1 /*
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
10 * information.
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>
24 #include "base.h"
26 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
27 driver))
29 struct device platform_bus = {
30 .init_name = "platform",
32 EXPORT_SYMBOL_GPL(platform_bus);
34 /**
35 * platform_get_resource - get a resource for a device
36 * @dev: platform device
37 * @type: resource type
38 * @num: resource index
40 struct resource *platform_get_resource(struct platform_device *dev,
41 unsigned int type, unsigned int num)
43 int i;
45 for (i = 0; i < dev->num_resources; i++) {
46 struct resource *r = &dev->resource[i];
48 if (type == resource_type(r) && num-- == 0)
49 return r;
51 return NULL;
53 EXPORT_SYMBOL_GPL(platform_get_resource);
55 /**
56 * platform_get_irq - get an IRQ for a device
57 * @dev: platform device
58 * @num: IRQ number index
60 int platform_get_irq(struct platform_device *dev, unsigned int num)
62 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
64 return r ? r->start : -ENXIO;
66 EXPORT_SYMBOL_GPL(platform_get_irq);
68 /**
69 * platform_get_resource_byname - get a resource for a device by name
70 * @dev: platform device
71 * @type: resource type
72 * @name: resource name
74 struct resource *platform_get_resource_byname(struct platform_device *dev,
75 unsigned int type,
76 const char *name)
78 int i;
80 for (i = 0; i < dev->num_resources; i++) {
81 struct resource *r = &dev->resource[i];
83 if (type == resource_type(r) && !strcmp(r->name, name))
84 return r;
86 return NULL;
88 EXPORT_SYMBOL_GPL(platform_get_resource_byname);
90 /**
91 * platform_get_irq - get an IRQ for a device
92 * @dev: platform device
93 * @name: IRQ name
95 int platform_get_irq_byname(struct platform_device *dev, const char *name)
97 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
98 name);
100 return r ? r->start : -ENXIO;
102 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
105 * platform_add_devices - add a numbers of platform devices
106 * @devs: array of platform devices to add
107 * @num: number of platform devices in array
109 int platform_add_devices(struct platform_device **devs, int num)
111 int i, ret = 0;
113 for (i = 0; i < num; i++) {
114 ret = platform_device_register(devs[i]);
115 if (ret) {
116 while (--i >= 0)
117 platform_device_unregister(devs[i]);
118 break;
122 return ret;
124 EXPORT_SYMBOL_GPL(platform_add_devices);
126 struct platform_object {
127 struct platform_device pdev;
128 char name[1];
132 * platform_device_put - destroy a platform device
133 * @pdev: platform device to free
135 * Free all memory associated with a platform device. This function must
136 * _only_ be externally called in error cases. All other usage is a bug.
138 void platform_device_put(struct platform_device *pdev)
140 if (pdev)
141 put_device(&pdev->dev);
143 EXPORT_SYMBOL_GPL(platform_device_put);
145 static void platform_device_release(struct device *dev)
147 struct platform_object *pa = container_of(dev, struct platform_object,
148 pdev.dev);
150 of_device_node_put(&pa->pdev.dev);
151 kfree(pa->pdev.dev.platform_data);
152 kfree(pa->pdev.resource);
153 kfree(pa);
157 * platform_device_alloc - create a platform device
158 * @name: base name of the device we're adding
159 * @id: instance id
161 * Create a platform device object which can have other objects attached
162 * to it, and which will have attached objects freed when it is released.
164 struct platform_device *platform_device_alloc(const char *name, int id)
166 struct platform_object *pa;
168 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
169 if (pa) {
170 strcpy(pa->name, name);
171 pa->pdev.name = pa->name;
172 pa->pdev.id = id;
173 device_initialize(&pa->pdev.dev);
174 pa->pdev.dev.release = platform_device_release;
177 return pa ? &pa->pdev : NULL;
179 EXPORT_SYMBOL_GPL(platform_device_alloc);
182 * platform_device_add_resources - add resources to a platform device
183 * @pdev: platform device allocated by platform_device_alloc to add resources to
184 * @res: set of resources that needs to be allocated for the device
185 * @num: number of resources
187 * Add a copy of the resources to the platform device. The memory
188 * associated with the resources will be freed when the platform device is
189 * released.
191 int platform_device_add_resources(struct platform_device *pdev,
192 const struct resource *res, unsigned int num)
194 struct resource *r;
196 if (!res)
197 return 0;
199 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
200 if (r) {
201 pdev->resource = r;
202 pdev->num_resources = num;
203 return 0;
205 return -ENOMEM;
207 EXPORT_SYMBOL_GPL(platform_device_add_resources);
210 * platform_device_add_data - add platform-specific data to a platform device
211 * @pdev: platform device allocated by platform_device_alloc to add resources to
212 * @data: platform specific data for this platform device
213 * @size: size of platform specific data
215 * Add a copy of platform specific data to the platform device's
216 * platform_data pointer. The memory associated with the platform data
217 * will be freed when the platform device is released.
219 int platform_device_add_data(struct platform_device *pdev, const void *data,
220 size_t size)
222 void *d;
224 if (!data)
225 return 0;
227 d = kmemdup(data, size, GFP_KERNEL);
228 if (d) {
229 pdev->dev.platform_data = d;
230 return 0;
232 return -ENOMEM;
234 EXPORT_SYMBOL_GPL(platform_device_add_data);
237 * platform_device_add - add a platform device to device hierarchy
238 * @pdev: platform device we're adding
240 * This is part 2 of platform_device_register(), though may be called
241 * separately _iff_ pdev was allocated by platform_device_alloc().
243 int platform_device_add(struct platform_device *pdev)
245 int i, ret = 0;
247 if (!pdev)
248 return -EINVAL;
250 if (!pdev->dev.parent)
251 pdev->dev.parent = &platform_bus;
253 pdev->dev.bus = &platform_bus_type;
255 if (pdev->id != -1)
256 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
257 else
258 dev_set_name(&pdev->dev, "%s", pdev->name);
260 for (i = 0; i < pdev->num_resources; i++) {
261 struct resource *p, *r = &pdev->resource[i];
263 if (r->name == NULL)
264 r->name = dev_name(&pdev->dev);
266 p = r->parent;
267 if (!p) {
268 if (resource_type(r) == IORESOURCE_MEM)
269 p = &iomem_resource;
270 else if (resource_type(r) == IORESOURCE_IO)
271 p = &ioport_resource;
274 if (p && insert_resource(p, r)) {
275 printk(KERN_ERR
276 "%s: failed to claim resource %d\n",
277 dev_name(&pdev->dev), i);
278 ret = -EBUSY;
279 goto failed;
283 pr_debug("Registering platform device '%s'. Parent at %s\n",
284 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
286 ret = device_add(&pdev->dev);
287 if (ret == 0)
288 return ret;
290 failed:
291 while (--i >= 0) {
292 struct resource *r = &pdev->resource[i];
293 unsigned long type = resource_type(r);
295 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
296 release_resource(r);
299 return ret;
301 EXPORT_SYMBOL_GPL(platform_device_add);
304 * platform_device_del - remove a platform-level device
305 * @pdev: platform device we're removing
307 * Note that this function will also release all memory- and port-based
308 * resources owned by the device (@dev->resource). This function must
309 * _only_ be externally called in error cases. All other usage is a bug.
311 void platform_device_del(struct platform_device *pdev)
313 int i;
315 if (pdev) {
316 device_del(&pdev->dev);
318 for (i = 0; i < pdev->num_resources; i++) {
319 struct resource *r = &pdev->resource[i];
320 unsigned long type = resource_type(r);
322 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
323 release_resource(r);
327 EXPORT_SYMBOL_GPL(platform_device_del);
330 * platform_device_register - add a platform-level device
331 * @pdev: platform device we're adding
333 int platform_device_register(struct platform_device *pdev)
335 device_initialize(&pdev->dev);
336 return platform_device_add(pdev);
338 EXPORT_SYMBOL_GPL(platform_device_register);
341 * platform_device_unregister - unregister a platform-level device
342 * @pdev: platform device we're unregistering
344 * Unregistration is done in 2 steps. First we release all resources
345 * and remove it from the subsystem, then we drop reference count by
346 * calling platform_device_put().
348 void platform_device_unregister(struct platform_device *pdev)
350 platform_device_del(pdev);
351 platform_device_put(pdev);
353 EXPORT_SYMBOL_GPL(platform_device_unregister);
356 * platform_device_register_resndata - add a platform-level device with
357 * resources and platform-specific data
359 * @parent: parent device for the device we're adding
360 * @name: base name of the device we're adding
361 * @id: instance id
362 * @res: set of resources that needs to be allocated for the device
363 * @num: number of resources
364 * @data: platform specific data for this platform device
365 * @size: size of platform specific data
367 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
369 struct platform_device *__init_or_module platform_device_register_resndata(
370 struct device *parent,
371 const char *name, int id,
372 const struct resource *res, unsigned int num,
373 const void *data, size_t size)
375 int ret = -ENOMEM;
376 struct platform_device *pdev;
378 pdev = platform_device_alloc(name, id);
379 if (!pdev)
380 goto err;
382 pdev->dev.parent = parent;
384 ret = platform_device_add_resources(pdev, res, num);
385 if (ret)
386 goto err;
388 ret = platform_device_add_data(pdev, data, size);
389 if (ret)
390 goto err;
392 ret = platform_device_add(pdev);
393 if (ret) {
394 err:
395 platform_device_put(pdev);
396 return ERR_PTR(ret);
399 return pdev;
401 EXPORT_SYMBOL_GPL(platform_device_register_resndata);
403 static int platform_drv_probe(struct device *_dev)
405 struct platform_driver *drv = to_platform_driver(_dev->driver);
406 struct platform_device *dev = to_platform_device(_dev);
408 return drv->probe(dev);
411 static int platform_drv_probe_fail(struct device *_dev)
413 return -ENXIO;
416 static int platform_drv_remove(struct device *_dev)
418 struct platform_driver *drv = to_platform_driver(_dev->driver);
419 struct platform_device *dev = to_platform_device(_dev);
421 return drv->remove(dev);
424 static void platform_drv_shutdown(struct device *_dev)
426 struct platform_driver *drv = to_platform_driver(_dev->driver);
427 struct platform_device *dev = to_platform_device(_dev);
429 drv->shutdown(dev);
433 * platform_driver_register - register a driver for platform-level devices
434 * @drv: platform driver structure
436 int platform_driver_register(struct platform_driver *drv)
438 drv->driver.bus = &platform_bus_type;
439 if (drv->probe)
440 drv->driver.probe = platform_drv_probe;
441 if (drv->remove)
442 drv->driver.remove = platform_drv_remove;
443 if (drv->shutdown)
444 drv->driver.shutdown = platform_drv_shutdown;
446 return driver_register(&drv->driver);
448 EXPORT_SYMBOL_GPL(platform_driver_register);
451 * platform_driver_unregister - unregister a driver for platform-level devices
452 * @drv: platform driver structure
454 void platform_driver_unregister(struct platform_driver *drv)
456 driver_unregister(&drv->driver);
458 EXPORT_SYMBOL_GPL(platform_driver_unregister);
461 * platform_driver_probe - register driver for non-hotpluggable device
462 * @drv: platform driver structure
463 * @probe: the driver probe routine, probably from an __init section
465 * Use this instead of platform_driver_register() when you know the device
466 * is not hotpluggable and has already been registered, and you want to
467 * remove its run-once probe() infrastructure from memory after the driver
468 * has bound to the device.
470 * One typical use for this would be with drivers for controllers integrated
471 * into system-on-chip processors, where the controller devices have been
472 * configured as part of board setup.
474 * Returns zero if the driver registered and bound to a device, else returns
475 * a negative error code and with the driver not registered.
477 int __init_or_module platform_driver_probe(struct platform_driver *drv,
478 int (*probe)(struct platform_device *))
480 int retval, code;
482 /* make sure driver won't have bind/unbind attributes */
483 drv->driver.suppress_bind_attrs = true;
485 /* temporary section violation during probe() */
486 drv->probe = probe;
487 retval = code = platform_driver_register(drv);
490 * Fixup that section violation, being paranoid about code scanning
491 * the list of drivers in order to probe new devices. Check to see
492 * if the probe was successful, and make sure any forced probes of
493 * new devices fail.
495 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
496 drv->probe = NULL;
497 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
498 retval = -ENODEV;
499 drv->driver.probe = platform_drv_probe_fail;
500 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
502 if (code != retval)
503 platform_driver_unregister(drv);
504 return retval;
506 EXPORT_SYMBOL_GPL(platform_driver_probe);
509 * platform_create_bundle - register driver and create corresponding device
510 * @driver: platform driver structure
511 * @probe: the driver probe routine, probably from an __init section
512 * @res: set of resources that needs to be allocated for the device
513 * @n_res: number of resources
514 * @data: platform specific data for this platform device
515 * @size: size of platform specific data
517 * Use this in legacy-style modules that probe hardware directly and
518 * register a single platform device and corresponding platform driver.
520 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
522 struct platform_device * __init_or_module platform_create_bundle(
523 struct platform_driver *driver,
524 int (*probe)(struct platform_device *),
525 struct resource *res, unsigned int n_res,
526 const void *data, size_t size)
528 struct platform_device *pdev;
529 int error;
531 pdev = platform_device_alloc(driver->driver.name, -1);
532 if (!pdev) {
533 error = -ENOMEM;
534 goto err_out;
537 error = platform_device_add_resources(pdev, res, n_res);
538 if (error)
539 goto err_pdev_put;
541 error = platform_device_add_data(pdev, data, size);
542 if (error)
543 goto err_pdev_put;
545 error = platform_device_add(pdev);
546 if (error)
547 goto err_pdev_put;
549 error = platform_driver_probe(driver, probe);
550 if (error)
551 goto err_pdev_del;
553 return pdev;
555 err_pdev_del:
556 platform_device_del(pdev);
557 err_pdev_put:
558 platform_device_put(pdev);
559 err_out:
560 return ERR_PTR(error);
562 EXPORT_SYMBOL_GPL(platform_create_bundle);
564 /* modalias support enables more hands-off userspace setup:
565 * (a) environment variable lets new-style hotplug events work once system is
566 * fully running: "modprobe $MODALIAS"
567 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
568 * mishandled before system is fully running: "modprobe $(cat modalias)"
570 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
571 char *buf)
573 struct platform_device *pdev = to_platform_device(dev);
574 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
576 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
579 static struct device_attribute platform_dev_attrs[] = {
580 __ATTR_RO(modalias),
581 __ATTR_NULL,
584 static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
586 struct platform_device *pdev = to_platform_device(dev);
587 int rc;
589 /* Some devices have extra OF data and an OF-style MODALIAS */
590 rc = of_device_uevent(dev,env);
591 if (rc != -ENODEV)
592 return rc;
594 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
595 (pdev->id_entry) ? pdev->id_entry->name : pdev->name);
596 return 0;
599 static const struct platform_device_id *platform_match_id(
600 const struct platform_device_id *id,
601 struct platform_device *pdev)
603 while (id->name[0]) {
604 if (strcmp(pdev->name, id->name) == 0) {
605 pdev->id_entry = id;
606 return id;
608 id++;
610 return NULL;
614 * platform_match - bind platform device to platform driver.
615 * @dev: device.
616 * @drv: driver.
618 * Platform device IDs are assumed to be encoded like this:
619 * "<name><instance>", where <name> is a short description of the type of
620 * device, like "pci" or "floppy", and <instance> is the enumerated
621 * instance of the device, like '0' or '42'. Driver IDs are simply
622 * "<name>". So, extract the <name> from the platform_device structure,
623 * and compare it against the name of the driver. Return whether they match
624 * or not.
626 static int platform_match(struct device *dev, struct device_driver *drv)
628 struct platform_device *pdev = to_platform_device(dev);
629 struct platform_driver *pdrv = to_platform_driver(drv);
631 /* Attempt an OF style match first */
632 if (of_driver_match_device(dev, drv))
633 return 1;
635 /* Then try to match against the id table */
636 if (pdrv->id_table)
637 return platform_match_id(pdrv->id_table, pdev) != NULL;
639 /* fall-back to driver name match */
640 return (strcmp(pdev->name, drv->name) == 0);
643 #ifdef CONFIG_PM_SLEEP
645 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
647 struct platform_driver *pdrv = to_platform_driver(dev->driver);
648 struct platform_device *pdev = to_platform_device(dev);
649 int ret = 0;
651 if (dev->driver && pdrv->suspend)
652 ret = pdrv->suspend(pdev, mesg);
654 return ret;
657 static int platform_legacy_resume(struct device *dev)
659 struct platform_driver *pdrv = to_platform_driver(dev->driver);
660 struct platform_device *pdev = to_platform_device(dev);
661 int ret = 0;
663 if (dev->driver && pdrv->resume)
664 ret = pdrv->resume(pdev);
666 return ret;
669 static int platform_pm_prepare(struct device *dev)
671 struct device_driver *drv = dev->driver;
672 int ret = 0;
674 if (drv && drv->pm && drv->pm->prepare)
675 ret = drv->pm->prepare(dev);
677 return ret;
680 static void platform_pm_complete(struct device *dev)
682 struct device_driver *drv = dev->driver;
684 if (drv && drv->pm && drv->pm->complete)
685 drv->pm->complete(dev);
688 #else /* !CONFIG_PM_SLEEP */
690 #define platform_pm_prepare NULL
691 #define platform_pm_complete NULL
693 #endif /* !CONFIG_PM_SLEEP */
695 #ifdef CONFIG_SUSPEND
697 int __weak platform_pm_suspend(struct device *dev)
699 struct device_driver *drv = dev->driver;
700 int ret = 0;
702 if (!drv)
703 return 0;
705 if (drv->pm) {
706 if (drv->pm->suspend)
707 ret = drv->pm->suspend(dev);
708 } else {
709 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
712 return ret;
715 int __weak platform_pm_suspend_noirq(struct device *dev)
717 struct device_driver *drv = dev->driver;
718 int ret = 0;
720 if (!drv)
721 return 0;
723 if (drv->pm) {
724 if (drv->pm->suspend_noirq)
725 ret = drv->pm->suspend_noirq(dev);
728 return ret;
731 int __weak platform_pm_resume(struct device *dev)
733 struct device_driver *drv = dev->driver;
734 int ret = 0;
736 if (!drv)
737 return 0;
739 if (drv->pm) {
740 if (drv->pm->resume)
741 ret = drv->pm->resume(dev);
742 } else {
743 ret = platform_legacy_resume(dev);
746 return ret;
749 int __weak platform_pm_resume_noirq(struct device *dev)
751 struct device_driver *drv = dev->driver;
752 int ret = 0;
754 if (!drv)
755 return 0;
757 if (drv->pm) {
758 if (drv->pm->resume_noirq)
759 ret = drv->pm->resume_noirq(dev);
762 return ret;
765 #else /* !CONFIG_SUSPEND */
767 #define platform_pm_suspend NULL
768 #define platform_pm_resume NULL
769 #define platform_pm_suspend_noirq NULL
770 #define platform_pm_resume_noirq NULL
772 #endif /* !CONFIG_SUSPEND */
774 #ifdef CONFIG_HIBERNATION
776 static int platform_pm_freeze(struct device *dev)
778 struct device_driver *drv = dev->driver;
779 int ret = 0;
781 if (!drv)
782 return 0;
784 if (drv->pm) {
785 if (drv->pm->freeze)
786 ret = drv->pm->freeze(dev);
787 } else {
788 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
791 return ret;
794 static int platform_pm_freeze_noirq(struct device *dev)
796 struct device_driver *drv = dev->driver;
797 int ret = 0;
799 if (!drv)
800 return 0;
802 if (drv->pm) {
803 if (drv->pm->freeze_noirq)
804 ret = drv->pm->freeze_noirq(dev);
807 return ret;
810 static int platform_pm_thaw(struct device *dev)
812 struct device_driver *drv = dev->driver;
813 int ret = 0;
815 if (!drv)
816 return 0;
818 if (drv->pm) {
819 if (drv->pm->thaw)
820 ret = drv->pm->thaw(dev);
821 } else {
822 ret = platform_legacy_resume(dev);
825 return ret;
828 static int platform_pm_thaw_noirq(struct device *dev)
830 struct device_driver *drv = dev->driver;
831 int ret = 0;
833 if (!drv)
834 return 0;
836 if (drv->pm) {
837 if (drv->pm->thaw_noirq)
838 ret = drv->pm->thaw_noirq(dev);
841 return ret;
844 static int platform_pm_poweroff(struct device *dev)
846 struct device_driver *drv = dev->driver;
847 int ret = 0;
849 if (!drv)
850 return 0;
852 if (drv->pm) {
853 if (drv->pm->poweroff)
854 ret = drv->pm->poweroff(dev);
855 } else {
856 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
859 return ret;
862 static int platform_pm_poweroff_noirq(struct device *dev)
864 struct device_driver *drv = dev->driver;
865 int ret = 0;
867 if (!drv)
868 return 0;
870 if (drv->pm) {
871 if (drv->pm->poweroff_noirq)
872 ret = drv->pm->poweroff_noirq(dev);
875 return ret;
878 static int platform_pm_restore(struct device *dev)
880 struct device_driver *drv = dev->driver;
881 int ret = 0;
883 if (!drv)
884 return 0;
886 if (drv->pm) {
887 if (drv->pm->restore)
888 ret = drv->pm->restore(dev);
889 } else {
890 ret = platform_legacy_resume(dev);
893 return ret;
896 static int platform_pm_restore_noirq(struct device *dev)
898 struct device_driver *drv = dev->driver;
899 int ret = 0;
901 if (!drv)
902 return 0;
904 if (drv->pm) {
905 if (drv->pm->restore_noirq)
906 ret = drv->pm->restore_noirq(dev);
909 return ret;
912 #else /* !CONFIG_HIBERNATION */
914 #define platform_pm_freeze NULL
915 #define platform_pm_thaw NULL
916 #define platform_pm_poweroff NULL
917 #define platform_pm_restore NULL
918 #define platform_pm_freeze_noirq NULL
919 #define platform_pm_thaw_noirq NULL
920 #define platform_pm_poweroff_noirq NULL
921 #define platform_pm_restore_noirq NULL
923 #endif /* !CONFIG_HIBERNATION */
925 #ifdef CONFIG_PM_RUNTIME
927 int __weak platform_pm_runtime_suspend(struct device *dev)
929 return pm_generic_runtime_suspend(dev);
932 int __weak platform_pm_runtime_resume(struct device *dev)
934 return pm_generic_runtime_resume(dev);
937 int __weak platform_pm_runtime_idle(struct device *dev)
939 return pm_generic_runtime_idle(dev);
942 #else /* !CONFIG_PM_RUNTIME */
944 #define platform_pm_runtime_suspend NULL
945 #define platform_pm_runtime_resume NULL
946 #define platform_pm_runtime_idle NULL
948 #endif /* !CONFIG_PM_RUNTIME */
950 static const struct dev_pm_ops platform_dev_pm_ops = {
951 .prepare = platform_pm_prepare,
952 .complete = platform_pm_complete,
953 .suspend = platform_pm_suspend,
954 .resume = platform_pm_resume,
955 .freeze = platform_pm_freeze,
956 .thaw = platform_pm_thaw,
957 .poweroff = platform_pm_poweroff,
958 .restore = platform_pm_restore,
959 .suspend_noirq = platform_pm_suspend_noirq,
960 .resume_noirq = platform_pm_resume_noirq,
961 .freeze_noirq = platform_pm_freeze_noirq,
962 .thaw_noirq = platform_pm_thaw_noirq,
963 .poweroff_noirq = platform_pm_poweroff_noirq,
964 .restore_noirq = platform_pm_restore_noirq,
965 .runtime_suspend = platform_pm_runtime_suspend,
966 .runtime_resume = platform_pm_runtime_resume,
967 .runtime_idle = platform_pm_runtime_idle,
970 struct bus_type platform_bus_type = {
971 .name = "platform",
972 .dev_attrs = platform_dev_attrs,
973 .match = platform_match,
974 .uevent = platform_uevent,
975 .pm = &platform_dev_pm_ops,
977 EXPORT_SYMBOL_GPL(platform_bus_type);
980 * platform_bus_get_pm_ops() - return pointer to busses dev_pm_ops
982 * This function can be used by platform code to get the current
983 * set of dev_pm_ops functions used by the platform_bus_type.
985 const struct dev_pm_ops * __init platform_bus_get_pm_ops(void)
987 return platform_bus_type.pm;
991 * platform_bus_set_pm_ops() - update dev_pm_ops for the platform_bus_type
993 * @pm: pointer to new dev_pm_ops struct to be used for platform_bus_type
995 * Platform code can override the dev_pm_ops methods of
996 * platform_bus_type by using this function. It is expected that
997 * platform code will first do a platform_bus_get_pm_ops(), then
998 * kmemdup it, then customize selected methods and pass a pointer to
999 * the new struct dev_pm_ops to this function.
1001 * Since platform-specific code is customizing methods for *all*
1002 * devices (not just platform-specific devices) it is expected that
1003 * any custom overrides of these functions will keep existing behavior
1004 * and simply extend it. For example, any customization of the
1005 * runtime PM methods should continue to call the pm_generic_*
1006 * functions as the default ones do in addition to the
1007 * platform-specific behavior.
1009 void __init platform_bus_set_pm_ops(const struct dev_pm_ops *pm)
1011 platform_bus_type.pm = pm;
1014 int __init platform_bus_init(void)
1016 int error;
1018 early_platform_cleanup();
1020 error = device_register(&platform_bus);
1021 if (error)
1022 return error;
1023 error = bus_register(&platform_bus_type);
1024 if (error)
1025 device_unregister(&platform_bus);
1026 return error;
1029 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1030 u64 dma_get_required_mask(struct device *dev)
1032 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1033 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1034 u64 mask;
1036 if (!high_totalram) {
1037 /* convert to mask just covering totalram */
1038 low_totalram = (1 << (fls(low_totalram) - 1));
1039 low_totalram += low_totalram - 1;
1040 mask = low_totalram;
1041 } else {
1042 high_totalram = (1 << (fls(high_totalram) - 1));
1043 high_totalram += high_totalram - 1;
1044 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1046 return mask;
1048 EXPORT_SYMBOL_GPL(dma_get_required_mask);
1049 #endif
1051 static __initdata LIST_HEAD(early_platform_driver_list);
1052 static __initdata LIST_HEAD(early_platform_device_list);
1055 * early_platform_driver_register - register early platform driver
1056 * @epdrv: early_platform driver structure
1057 * @buf: string passed from early_param()
1059 * Helper function for early_platform_init() / early_platform_init_buffer()
1061 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1062 char *buf)
1064 char *tmp;
1065 int n;
1067 /* Simply add the driver to the end of the global list.
1068 * Drivers will by default be put on the list in compiled-in order.
1070 if (!epdrv->list.next) {
1071 INIT_LIST_HEAD(&epdrv->list);
1072 list_add_tail(&epdrv->list, &early_platform_driver_list);
1075 /* If the user has specified device then make sure the driver
1076 * gets prioritized. The driver of the last device specified on
1077 * command line will be put first on the list.
1079 n = strlen(epdrv->pdrv->driver.name);
1080 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1081 list_move(&epdrv->list, &early_platform_driver_list);
1083 /* Allow passing parameters after device name */
1084 if (buf[n] == '\0' || buf[n] == ',')
1085 epdrv->requested_id = -1;
1086 else {
1087 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1088 &tmp, 10);
1090 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1091 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1092 n = 0;
1093 } else
1094 n += strcspn(&buf[n + 1], ",") + 1;
1097 if (buf[n] == ',')
1098 n++;
1100 if (epdrv->bufsize) {
1101 memcpy(epdrv->buffer, &buf[n],
1102 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1103 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1107 return 0;
1111 * early_platform_add_devices - adds a number of early platform devices
1112 * @devs: array of early platform devices to add
1113 * @num: number of early platform devices in array
1115 * Used by early architecture code to register early platform devices and
1116 * their platform data.
1118 void __init early_platform_add_devices(struct platform_device **devs, int num)
1120 struct device *dev;
1121 int i;
1123 /* simply add the devices to list */
1124 for (i = 0; i < num; i++) {
1125 dev = &devs[i]->dev;
1127 if (!dev->devres_head.next) {
1128 INIT_LIST_HEAD(&dev->devres_head);
1129 list_add_tail(&dev->devres_head,
1130 &early_platform_device_list);
1136 * early_platform_driver_register_all - register early platform drivers
1137 * @class_str: string to identify early platform driver class
1139 * Used by architecture code to register all early platform drivers
1140 * for a certain class. If omitted then only early platform drivers
1141 * with matching kernel command line class parameters will be registered.
1143 void __init early_platform_driver_register_all(char *class_str)
1145 /* The "class_str" parameter may or may not be present on the kernel
1146 * command line. If it is present then there may be more than one
1147 * matching parameter.
1149 * Since we register our early platform drivers using early_param()
1150 * we need to make sure that they also get registered in the case
1151 * when the parameter is missing from the kernel command line.
1153 * We use parse_early_options() to make sure the early_param() gets
1154 * called at least once. The early_param() may be called more than
1155 * once since the name of the preferred device may be specified on
1156 * the kernel command line. early_platform_driver_register() handles
1157 * this case for us.
1159 parse_early_options(class_str);
1163 * early_platform_match - find early platform device matching driver
1164 * @epdrv: early platform driver structure
1165 * @id: id to match against
1167 static __init struct platform_device *
1168 early_platform_match(struct early_platform_driver *epdrv, int id)
1170 struct platform_device *pd;
1172 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1173 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1174 if (pd->id == id)
1175 return pd;
1177 return NULL;
1181 * early_platform_left - check if early platform driver has matching devices
1182 * @epdrv: early platform driver structure
1183 * @id: return true if id or above exists
1185 static __init int early_platform_left(struct early_platform_driver *epdrv,
1186 int id)
1188 struct platform_device *pd;
1190 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1191 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1192 if (pd->id >= id)
1193 return 1;
1195 return 0;
1199 * early_platform_driver_probe_id - probe drivers matching class_str and id
1200 * @class_str: string to identify early platform driver class
1201 * @id: id to match against
1202 * @nr_probe: number of platform devices to successfully probe before exiting
1204 static int __init early_platform_driver_probe_id(char *class_str,
1205 int id,
1206 int nr_probe)
1208 struct early_platform_driver *epdrv;
1209 struct platform_device *match;
1210 int match_id;
1211 int n = 0;
1212 int left = 0;
1214 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1215 /* only use drivers matching our class_str */
1216 if (strcmp(class_str, epdrv->class_str))
1217 continue;
1219 if (id == -2) {
1220 match_id = epdrv->requested_id;
1221 left = 1;
1223 } else {
1224 match_id = id;
1225 left += early_platform_left(epdrv, id);
1227 /* skip requested id */
1228 switch (epdrv->requested_id) {
1229 case EARLY_PLATFORM_ID_ERROR:
1230 case EARLY_PLATFORM_ID_UNSET:
1231 break;
1232 default:
1233 if (epdrv->requested_id == id)
1234 match_id = EARLY_PLATFORM_ID_UNSET;
1238 switch (match_id) {
1239 case EARLY_PLATFORM_ID_ERROR:
1240 pr_warning("%s: unable to parse %s parameter\n",
1241 class_str, epdrv->pdrv->driver.name);
1242 /* fall-through */
1243 case EARLY_PLATFORM_ID_UNSET:
1244 match = NULL;
1245 break;
1246 default:
1247 match = early_platform_match(epdrv, match_id);
1250 if (match) {
1252 * Set up a sensible init_name to enable
1253 * dev_name() and others to be used before the
1254 * rest of the driver core is initialized.
1256 if (!match->dev.init_name && slab_is_available()) {
1257 if (match->id != -1)
1258 match->dev.init_name =
1259 kasprintf(GFP_KERNEL, "%s.%d",
1260 match->name,
1261 match->id);
1262 else
1263 match->dev.init_name =
1264 kasprintf(GFP_KERNEL, "%s",
1265 match->name);
1267 if (!match->dev.init_name)
1268 return -ENOMEM;
1271 if (epdrv->pdrv->probe(match))
1272 pr_warning("%s: unable to probe %s early.\n",
1273 class_str, match->name);
1274 else
1275 n++;
1278 if (n >= nr_probe)
1279 break;
1282 if (left)
1283 return n;
1284 else
1285 return -ENODEV;
1289 * early_platform_driver_probe - probe a class of registered drivers
1290 * @class_str: string to identify early platform driver class
1291 * @nr_probe: number of platform devices to successfully probe before exiting
1292 * @user_only: only probe user specified early platform devices
1294 * Used by architecture code to probe registered early platform drivers
1295 * within a certain class. For probe to happen a registered early platform
1296 * device matching a registered early platform driver is needed.
1298 int __init early_platform_driver_probe(char *class_str,
1299 int nr_probe,
1300 int user_only)
1302 int k, n, i;
1304 n = 0;
1305 for (i = -2; n < nr_probe; i++) {
1306 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1308 if (k < 0)
1309 break;
1311 n += k;
1313 if (user_only)
1314 break;
1317 return n;
1321 * early_platform_cleanup - clean up early platform code
1323 void __init early_platform_cleanup(void)
1325 struct platform_device *pd, *pd2;
1327 /* clean up the devres list used to chain devices */
1328 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1329 dev.devres_head) {
1330 list_del(&pd->dev.devres_head);
1331 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));