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/pm_domain.h>
25 #include <linux/idr.h>
26 #include <linux/acpi.h>
27 #include <linux/clk/clk-conf.h>
28 #include <linux/limits.h>
31 #include "power/power.h"
33 /* For automatically allocated device IDs */
34 static DEFINE_IDA(platform_devid_ida
);
36 struct device platform_bus
= {
37 .init_name
= "platform",
39 EXPORT_SYMBOL_GPL(platform_bus
);
42 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
43 * @pdev: platform device
45 * This is called before platform_device_add() such that any pdev_archdata may
46 * be setup before the platform_notifier is called. So if a user needs to
47 * manipulate any relevant information in the pdev_archdata they can do:
49 * platform_device_alloc()
51 * platform_device_add()
53 * And if they don't care they can just call platform_device_register() and
54 * everything will just work out.
56 void __weak
arch_setup_pdev_archdata(struct platform_device
*pdev
)
61 * platform_get_resource - get a resource for a device
62 * @dev: platform device
63 * @type: resource type
64 * @num: resource index
66 struct resource
*platform_get_resource(struct platform_device
*dev
,
67 unsigned int type
, unsigned int num
)
71 for (i
= 0; i
< dev
->num_resources
; i
++) {
72 struct resource
*r
= &dev
->resource
[i
];
74 if (type
== resource_type(r
) && num
-- == 0)
79 EXPORT_SYMBOL_GPL(platform_get_resource
);
82 * platform_get_irq - get an IRQ for a device
83 * @dev: platform device
84 * @num: IRQ number index
86 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
89 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
90 if (!dev
|| num
>= dev
->archdata
.num_irqs
)
92 return dev
->archdata
.irqs
[num
];
95 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
98 ret
= of_irq_get(dev
->dev
.of_node
, num
);
99 if (ret
>= 0 || ret
== -EPROBE_DEFER
)
103 r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
105 return r
? r
->start
: -ENXIO
;
108 EXPORT_SYMBOL_GPL(platform_get_irq
);
111 * platform_get_resource_byname - get a resource for a device by name
112 * @dev: platform device
113 * @type: resource type
114 * @name: resource name
116 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
122 for (i
= 0; i
< dev
->num_resources
; i
++) {
123 struct resource
*r
= &dev
->resource
[i
];
125 if (unlikely(!r
->name
))
128 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
133 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
136 * platform_get_irq_byname - get an IRQ for a device by name
137 * @dev: platform device
140 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
144 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
147 ret
= of_irq_get_byname(dev
->dev
.of_node
, name
);
148 if (ret
>= 0 || ret
== -EPROBE_DEFER
)
152 r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
, name
);
153 return r
? r
->start
: -ENXIO
;
155 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
158 * platform_add_devices - add a numbers of platform devices
159 * @devs: array of platform devices to add
160 * @num: number of platform devices in array
162 int platform_add_devices(struct platform_device
**devs
, int num
)
166 for (i
= 0; i
< num
; i
++) {
167 ret
= platform_device_register(devs
[i
]);
170 platform_device_unregister(devs
[i
]);
177 EXPORT_SYMBOL_GPL(platform_add_devices
);
179 struct platform_object
{
180 struct platform_device pdev
;
185 * platform_device_put - destroy a platform device
186 * @pdev: platform device to free
188 * Free all memory associated with a platform device. This function must
189 * _only_ be externally called in error cases. All other usage is a bug.
191 void platform_device_put(struct platform_device
*pdev
)
194 put_device(&pdev
->dev
);
196 EXPORT_SYMBOL_GPL(platform_device_put
);
198 static void platform_device_release(struct device
*dev
)
200 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
203 of_device_node_put(&pa
->pdev
.dev
);
204 kfree(pa
->pdev
.dev
.platform_data
);
205 kfree(pa
->pdev
.mfd_cell
);
206 kfree(pa
->pdev
.resource
);
207 kfree(pa
->pdev
.driver_override
);
212 * platform_device_alloc - create a platform device
213 * @name: base name of the device we're adding
216 * Create a platform device object which can have other objects attached
217 * to it, and which will have attached objects freed when it is released.
219 struct platform_device
*platform_device_alloc(const char *name
, int id
)
221 struct platform_object
*pa
;
223 pa
= kzalloc(sizeof(*pa
) + strlen(name
) + 1, GFP_KERNEL
);
225 strcpy(pa
->name
, name
);
226 pa
->pdev
.name
= pa
->name
;
228 device_initialize(&pa
->pdev
.dev
);
229 pa
->pdev
.dev
.release
= platform_device_release
;
230 arch_setup_pdev_archdata(&pa
->pdev
);
233 return pa
? &pa
->pdev
: NULL
;
235 EXPORT_SYMBOL_GPL(platform_device_alloc
);
238 * platform_device_add_resources - add resources to a platform device
239 * @pdev: platform device allocated by platform_device_alloc to add resources to
240 * @res: set of resources that needs to be allocated for the device
241 * @num: number of resources
243 * Add a copy of the resources to the platform device. The memory
244 * associated with the resources will be freed when the platform device is
247 int platform_device_add_resources(struct platform_device
*pdev
,
248 const struct resource
*res
, unsigned int num
)
250 struct resource
*r
= NULL
;
253 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
258 kfree(pdev
->resource
);
260 pdev
->num_resources
= num
;
263 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
266 * platform_device_add_data - add platform-specific data to a platform device
267 * @pdev: platform device allocated by platform_device_alloc to add resources to
268 * @data: platform specific data for this platform device
269 * @size: size of platform specific data
271 * Add a copy of platform specific data to the platform device's
272 * platform_data pointer. The memory associated with the platform data
273 * will be freed when the platform device is released.
275 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
281 d
= kmemdup(data
, size
, GFP_KERNEL
);
286 kfree(pdev
->dev
.platform_data
);
287 pdev
->dev
.platform_data
= d
;
290 EXPORT_SYMBOL_GPL(platform_device_add_data
);
293 * platform_device_add - add a platform device to device hierarchy
294 * @pdev: platform device we're adding
296 * This is part 2 of platform_device_register(), though may be called
297 * separately _iff_ pdev was allocated by platform_device_alloc().
299 int platform_device_add(struct platform_device
*pdev
)
306 if (!pdev
->dev
.parent
)
307 pdev
->dev
.parent
= &platform_bus
;
309 pdev
->dev
.bus
= &platform_bus_type
;
313 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
315 case PLATFORM_DEVID_NONE
:
316 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
318 case PLATFORM_DEVID_AUTO
:
320 * Automatically allocated device ID. We mark it as such so
321 * that we remember it must be freed, and we append a suffix
322 * to avoid namespace collision with explicit IDs.
324 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
328 pdev
->id_auto
= true;
329 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
333 for (i
= 0; i
< pdev
->num_resources
; i
++) {
334 struct resource
*p
, *r
= &pdev
->resource
[i
];
337 r
->name
= dev_name(&pdev
->dev
);
341 if (resource_type(r
) == IORESOURCE_MEM
)
343 else if (resource_type(r
) == IORESOURCE_IO
)
344 p
= &ioport_resource
;
347 if (p
&& insert_resource(p
, r
)) {
348 dev_err(&pdev
->dev
, "failed to claim resource %d\n", i
);
354 pr_debug("Registering platform device '%s'. Parent at %s\n",
355 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
357 ret
= device_add(&pdev
->dev
);
363 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
364 pdev
->id
= PLATFORM_DEVID_AUTO
;
368 struct resource
*r
= &pdev
->resource
[i
];
369 unsigned long type
= resource_type(r
);
371 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
378 EXPORT_SYMBOL_GPL(platform_device_add
);
381 * platform_device_del - remove a platform-level device
382 * @pdev: platform device we're removing
384 * Note that this function will also release all memory- and port-based
385 * resources owned by the device (@dev->resource). This function must
386 * _only_ be externally called in error cases. All other usage is a bug.
388 void platform_device_del(struct platform_device
*pdev
)
393 device_del(&pdev
->dev
);
396 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
397 pdev
->id
= PLATFORM_DEVID_AUTO
;
400 for (i
= 0; i
< pdev
->num_resources
; i
++) {
401 struct resource
*r
= &pdev
->resource
[i
];
402 unsigned long type
= resource_type(r
);
404 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
409 EXPORT_SYMBOL_GPL(platform_device_del
);
412 * platform_device_register - add a platform-level device
413 * @pdev: platform device we're adding
415 int platform_device_register(struct platform_device
*pdev
)
417 device_initialize(&pdev
->dev
);
418 arch_setup_pdev_archdata(pdev
);
419 return platform_device_add(pdev
);
421 EXPORT_SYMBOL_GPL(platform_device_register
);
424 * platform_device_unregister - unregister a platform-level device
425 * @pdev: platform device we're unregistering
427 * Unregistration is done in 2 steps. First we release all resources
428 * and remove it from the subsystem, then we drop reference count by
429 * calling platform_device_put().
431 void platform_device_unregister(struct platform_device
*pdev
)
433 platform_device_del(pdev
);
434 platform_device_put(pdev
);
436 EXPORT_SYMBOL_GPL(platform_device_unregister
);
439 * platform_device_register_full - add a platform-level device with
440 * resources and platform-specific data
442 * @pdevinfo: data used to create device
444 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
446 struct platform_device
*platform_device_register_full(
447 const struct platform_device_info
*pdevinfo
)
450 struct platform_device
*pdev
;
452 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
456 pdev
->dev
.parent
= pdevinfo
->parent
;
457 ACPI_COMPANION_SET(&pdev
->dev
, pdevinfo
->acpi_node
.companion
);
459 if (pdevinfo
->dma_mask
) {
461 * This memory isn't freed when the device is put,
462 * I don't have a nice idea for that though. Conceptually
463 * dma_mask in struct device should not be a pointer.
464 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
467 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
468 if (!pdev
->dev
.dma_mask
)
471 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
472 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
475 ret
= platform_device_add_resources(pdev
,
476 pdevinfo
->res
, pdevinfo
->num_res
);
480 ret
= platform_device_add_data(pdev
,
481 pdevinfo
->data
, pdevinfo
->size_data
);
485 ret
= platform_device_add(pdev
);
488 ACPI_COMPANION_SET(&pdev
->dev
, NULL
);
489 kfree(pdev
->dev
.dma_mask
);
492 platform_device_put(pdev
);
498 EXPORT_SYMBOL_GPL(platform_device_register_full
);
500 static int platform_drv_probe(struct device
*_dev
)
502 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
503 struct platform_device
*dev
= to_platform_device(_dev
);
506 ret
= of_clk_set_defaults(_dev
->of_node
, false);
510 ret
= dev_pm_domain_attach(_dev
, true);
511 if (ret
!= -EPROBE_DEFER
) {
512 ret
= drv
->probe(dev
);
514 dev_pm_domain_detach(_dev
, true);
517 if (drv
->prevent_deferred_probe
&& ret
== -EPROBE_DEFER
) {
518 dev_warn(_dev
, "probe deferral not supported\n");
525 static int platform_drv_probe_fail(struct device
*_dev
)
530 static int platform_drv_remove(struct device
*_dev
)
532 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
533 struct platform_device
*dev
= to_platform_device(_dev
);
536 ret
= drv
->remove(dev
);
537 dev_pm_domain_detach(_dev
, true);
542 static void platform_drv_shutdown(struct device
*_dev
)
544 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
545 struct platform_device
*dev
= to_platform_device(_dev
);
548 dev_pm_domain_detach(_dev
, true);
552 * __platform_driver_register - register a driver for platform-level devices
553 * @drv: platform driver structure
554 * @owner: owning module/driver
556 int __platform_driver_register(struct platform_driver
*drv
,
557 struct module
*owner
)
559 drv
->driver
.owner
= owner
;
560 drv
->driver
.bus
= &platform_bus_type
;
562 drv
->driver
.probe
= platform_drv_probe
;
564 drv
->driver
.remove
= platform_drv_remove
;
566 drv
->driver
.shutdown
= platform_drv_shutdown
;
568 return driver_register(&drv
->driver
);
570 EXPORT_SYMBOL_GPL(__platform_driver_register
);
573 * platform_driver_unregister - unregister a driver for platform-level devices
574 * @drv: platform driver structure
576 void platform_driver_unregister(struct platform_driver
*drv
)
578 driver_unregister(&drv
->driver
);
580 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
583 * platform_driver_probe - register driver for non-hotpluggable device
584 * @drv: platform driver structure
585 * @probe: the driver probe routine, probably from an __init section
587 * Use this instead of platform_driver_register() when you know the device
588 * is not hotpluggable and has already been registered, and you want to
589 * remove its run-once probe() infrastructure from memory after the driver
590 * has bound to the device.
592 * One typical use for this would be with drivers for controllers integrated
593 * into system-on-chip processors, where the controller devices have been
594 * configured as part of board setup.
596 * Note that this is incompatible with deferred probing.
598 * Returns zero if the driver registered and bound to a device, else returns
599 * a negative error code and with the driver not registered.
601 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
602 int (*probe
)(struct platform_device
*))
607 * Prevent driver from requesting probe deferral to avoid further
608 * futile probe attempts.
610 drv
->prevent_deferred_probe
= true;
612 /* make sure driver won't have bind/unbind attributes */
613 drv
->driver
.suppress_bind_attrs
= true;
615 /* temporary section violation during probe() */
617 retval
= code
= platform_driver_register(drv
);
620 * Fixup that section violation, being paranoid about code scanning
621 * the list of drivers in order to probe new devices. Check to see
622 * if the probe was successful, and make sure any forced probes of
625 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
627 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
629 drv
->driver
.probe
= platform_drv_probe_fail
;
630 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
633 platform_driver_unregister(drv
);
636 EXPORT_SYMBOL_GPL(platform_driver_probe
);
639 * platform_create_bundle - register driver and create corresponding device
640 * @driver: platform driver structure
641 * @probe: the driver probe routine, probably from an __init section
642 * @res: set of resources that needs to be allocated for the device
643 * @n_res: number of resources
644 * @data: platform specific data for this platform device
645 * @size: size of platform specific data
647 * Use this in legacy-style modules that probe hardware directly and
648 * register a single platform device and corresponding platform driver.
650 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
652 struct platform_device
* __init_or_module
platform_create_bundle(
653 struct platform_driver
*driver
,
654 int (*probe
)(struct platform_device
*),
655 struct resource
*res
, unsigned int n_res
,
656 const void *data
, size_t size
)
658 struct platform_device
*pdev
;
661 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
667 error
= platform_device_add_resources(pdev
, res
, n_res
);
671 error
= platform_device_add_data(pdev
, data
, size
);
675 error
= platform_device_add(pdev
);
679 error
= platform_driver_probe(driver
, probe
);
686 platform_device_del(pdev
);
688 platform_device_put(pdev
);
690 return ERR_PTR(error
);
692 EXPORT_SYMBOL_GPL(platform_create_bundle
);
694 /* modalias support enables more hands-off userspace setup:
695 * (a) environment variable lets new-style hotplug events work once system is
696 * fully running: "modprobe $MODALIAS"
697 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
698 * mishandled before system is fully running: "modprobe $(cat modalias)"
700 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
703 struct platform_device
*pdev
= to_platform_device(dev
);
706 len
= of_device_get_modalias(dev
, buf
, PAGE_SIZE
-1);
710 len
= acpi_device_modalias(dev
, buf
, PAGE_SIZE
-1);
714 len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
716 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
718 static DEVICE_ATTR_RO(modalias
);
720 static ssize_t
driver_override_store(struct device
*dev
,
721 struct device_attribute
*attr
,
722 const char *buf
, size_t count
)
724 struct platform_device
*pdev
= to_platform_device(dev
);
725 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
727 if (count
> PATH_MAX
)
730 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
731 if (!driver_override
)
734 cp
= strchr(driver_override
, '\n');
738 if (strlen(driver_override
)) {
739 pdev
->driver_override
= driver_override
;
741 kfree(driver_override
);
742 pdev
->driver_override
= NULL
;
750 static ssize_t
driver_override_show(struct device
*dev
,
751 struct device_attribute
*attr
, char *buf
)
753 struct platform_device
*pdev
= to_platform_device(dev
);
755 return sprintf(buf
, "%s\n", pdev
->driver_override
);
757 static DEVICE_ATTR_RW(driver_override
);
760 static struct attribute
*platform_dev_attrs
[] = {
761 &dev_attr_modalias
.attr
,
762 &dev_attr_driver_override
.attr
,
765 ATTRIBUTE_GROUPS(platform_dev
);
767 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
769 struct platform_device
*pdev
= to_platform_device(dev
);
772 /* Some devices have extra OF data and an OF-style MODALIAS */
773 rc
= of_device_uevent_modalias(dev
, env
);
777 rc
= acpi_device_uevent_modalias(dev
, env
);
781 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
786 static const struct platform_device_id
*platform_match_id(
787 const struct platform_device_id
*id
,
788 struct platform_device
*pdev
)
790 while (id
->name
[0]) {
791 if (strcmp(pdev
->name
, id
->name
) == 0) {
801 * platform_match - bind platform device to platform driver.
805 * Platform device IDs are assumed to be encoded like this:
806 * "<name><instance>", where <name> is a short description of the type of
807 * device, like "pci" or "floppy", and <instance> is the enumerated
808 * instance of the device, like '0' or '42'. Driver IDs are simply
809 * "<name>". So, extract the <name> from the platform_device structure,
810 * and compare it against the name of the driver. Return whether they match
813 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
815 struct platform_device
*pdev
= to_platform_device(dev
);
816 struct platform_driver
*pdrv
= to_platform_driver(drv
);
818 /* When driver_override is set, only bind to the matching driver */
819 if (pdev
->driver_override
)
820 return !strcmp(pdev
->driver_override
, drv
->name
);
822 /* Attempt an OF style match first */
823 if (of_driver_match_device(dev
, drv
))
826 /* Then try ACPI style match */
827 if (acpi_driver_match_device(dev
, drv
))
830 /* Then try to match against the id table */
832 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
834 /* fall-back to driver name match */
835 return (strcmp(pdev
->name
, drv
->name
) == 0);
838 #ifdef CONFIG_PM_SLEEP
840 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
842 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
843 struct platform_device
*pdev
= to_platform_device(dev
);
846 if (dev
->driver
&& pdrv
->suspend
)
847 ret
= pdrv
->suspend(pdev
, mesg
);
852 static int platform_legacy_resume(struct device
*dev
)
854 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
855 struct platform_device
*pdev
= to_platform_device(dev
);
858 if (dev
->driver
&& pdrv
->resume
)
859 ret
= pdrv
->resume(pdev
);
864 #endif /* CONFIG_PM_SLEEP */
866 #ifdef CONFIG_SUSPEND
868 int platform_pm_suspend(struct device
*dev
)
870 struct device_driver
*drv
= dev
->driver
;
877 if (drv
->pm
->suspend
)
878 ret
= drv
->pm
->suspend(dev
);
880 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
886 int platform_pm_resume(struct device
*dev
)
888 struct device_driver
*drv
= dev
->driver
;
896 ret
= drv
->pm
->resume(dev
);
898 ret
= platform_legacy_resume(dev
);
904 #endif /* CONFIG_SUSPEND */
906 #ifdef CONFIG_HIBERNATE_CALLBACKS
908 int platform_pm_freeze(struct device
*dev
)
910 struct device_driver
*drv
= dev
->driver
;
918 ret
= drv
->pm
->freeze(dev
);
920 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
926 int platform_pm_thaw(struct device
*dev
)
928 struct device_driver
*drv
= dev
->driver
;
936 ret
= drv
->pm
->thaw(dev
);
938 ret
= platform_legacy_resume(dev
);
944 int platform_pm_poweroff(struct device
*dev
)
946 struct device_driver
*drv
= dev
->driver
;
953 if (drv
->pm
->poweroff
)
954 ret
= drv
->pm
->poweroff(dev
);
956 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
962 int platform_pm_restore(struct device
*dev
)
964 struct device_driver
*drv
= dev
->driver
;
971 if (drv
->pm
->restore
)
972 ret
= drv
->pm
->restore(dev
);
974 ret
= platform_legacy_resume(dev
);
980 #endif /* CONFIG_HIBERNATE_CALLBACKS */
982 static const struct dev_pm_ops platform_dev_pm_ops
= {
983 .runtime_suspend
= pm_generic_runtime_suspend
,
984 .runtime_resume
= pm_generic_runtime_resume
,
985 USE_PLATFORM_PM_SLEEP_OPS
988 struct bus_type platform_bus_type
= {
990 .dev_groups
= platform_dev_groups
,
991 .match
= platform_match
,
992 .uevent
= platform_uevent
,
993 .pm
= &platform_dev_pm_ops
,
995 EXPORT_SYMBOL_GPL(platform_bus_type
);
997 int __init
platform_bus_init(void)
1001 early_platform_cleanup();
1003 error
= device_register(&platform_bus
);
1006 error
= bus_register(&platform_bus_type
);
1008 device_unregister(&platform_bus
);
1012 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1013 u64
dma_get_required_mask(struct device
*dev
)
1015 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1016 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1019 if (!high_totalram
) {
1020 /* convert to mask just covering totalram */
1021 low_totalram
= (1 << (fls(low_totalram
) - 1));
1022 low_totalram
+= low_totalram
- 1;
1023 mask
= low_totalram
;
1025 high_totalram
= (1 << (fls(high_totalram
) - 1));
1026 high_totalram
+= high_totalram
- 1;
1027 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1031 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1034 static __initdata
LIST_HEAD(early_platform_driver_list
);
1035 static __initdata
LIST_HEAD(early_platform_device_list
);
1038 * early_platform_driver_register - register early platform driver
1039 * @epdrv: early_platform driver structure
1040 * @buf: string passed from early_param()
1042 * Helper function for early_platform_init() / early_platform_init_buffer()
1044 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1050 /* Simply add the driver to the end of the global list.
1051 * Drivers will by default be put on the list in compiled-in order.
1053 if (!epdrv
->list
.next
) {
1054 INIT_LIST_HEAD(&epdrv
->list
);
1055 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1058 /* If the user has specified device then make sure the driver
1059 * gets prioritized. The driver of the last device specified on
1060 * command line will be put first on the list.
1062 n
= strlen(epdrv
->pdrv
->driver
.name
);
1063 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1064 list_move(&epdrv
->list
, &early_platform_driver_list
);
1066 /* Allow passing parameters after device name */
1067 if (buf
[n
] == '\0' || buf
[n
] == ',')
1068 epdrv
->requested_id
= -1;
1070 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1073 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1074 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1077 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1083 if (epdrv
->bufsize
) {
1084 memcpy(epdrv
->buffer
, &buf
[n
],
1085 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1086 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1094 * early_platform_add_devices - adds a number of early platform devices
1095 * @devs: array of early platform devices to add
1096 * @num: number of early platform devices in array
1098 * Used by early architecture code to register early platform devices and
1099 * their platform data.
1101 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1106 /* simply add the devices to list */
1107 for (i
= 0; i
< num
; i
++) {
1108 dev
= &devs
[i
]->dev
;
1110 if (!dev
->devres_head
.next
) {
1111 pm_runtime_early_init(dev
);
1112 INIT_LIST_HEAD(&dev
->devres_head
);
1113 list_add_tail(&dev
->devres_head
,
1114 &early_platform_device_list
);
1120 * early_platform_driver_register_all - register early platform drivers
1121 * @class_str: string to identify early platform driver class
1123 * Used by architecture code to register all early platform drivers
1124 * for a certain class. If omitted then only early platform drivers
1125 * with matching kernel command line class parameters will be registered.
1127 void __init
early_platform_driver_register_all(char *class_str
)
1129 /* The "class_str" parameter may or may not be present on the kernel
1130 * command line. If it is present then there may be more than one
1131 * matching parameter.
1133 * Since we register our early platform drivers using early_param()
1134 * we need to make sure that they also get registered in the case
1135 * when the parameter is missing from the kernel command line.
1137 * We use parse_early_options() to make sure the early_param() gets
1138 * called at least once. The early_param() may be called more than
1139 * once since the name of the preferred device may be specified on
1140 * the kernel command line. early_platform_driver_register() handles
1143 parse_early_options(class_str
);
1147 * early_platform_match - find early platform device matching driver
1148 * @epdrv: early platform driver structure
1149 * @id: id to match against
1151 static struct platform_device
* __init
1152 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1154 struct platform_device
*pd
;
1156 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1157 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1165 * early_platform_left - check if early platform driver has matching devices
1166 * @epdrv: early platform driver structure
1167 * @id: return true if id or above exists
1169 static int __init
early_platform_left(struct early_platform_driver
*epdrv
,
1172 struct platform_device
*pd
;
1174 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1175 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1183 * early_platform_driver_probe_id - probe drivers matching class_str and id
1184 * @class_str: string to identify early platform driver class
1185 * @id: id to match against
1186 * @nr_probe: number of platform devices to successfully probe before exiting
1188 static int __init
early_platform_driver_probe_id(char *class_str
,
1192 struct early_platform_driver
*epdrv
;
1193 struct platform_device
*match
;
1198 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1199 /* only use drivers matching our class_str */
1200 if (strcmp(class_str
, epdrv
->class_str
))
1204 match_id
= epdrv
->requested_id
;
1209 left
+= early_platform_left(epdrv
, id
);
1211 /* skip requested id */
1212 switch (epdrv
->requested_id
) {
1213 case EARLY_PLATFORM_ID_ERROR
:
1214 case EARLY_PLATFORM_ID_UNSET
:
1217 if (epdrv
->requested_id
== id
)
1218 match_id
= EARLY_PLATFORM_ID_UNSET
;
1223 case EARLY_PLATFORM_ID_ERROR
:
1224 pr_warn("%s: unable to parse %s parameter\n",
1225 class_str
, epdrv
->pdrv
->driver
.name
);
1227 case EARLY_PLATFORM_ID_UNSET
:
1231 match
= early_platform_match(epdrv
, match_id
);
1236 * Set up a sensible init_name to enable
1237 * dev_name() and others to be used before the
1238 * rest of the driver core is initialized.
1240 if (!match
->dev
.init_name
&& slab_is_available()) {
1241 if (match
->id
!= -1)
1242 match
->dev
.init_name
=
1243 kasprintf(GFP_KERNEL
, "%s.%d",
1247 match
->dev
.init_name
=
1248 kasprintf(GFP_KERNEL
, "%s",
1251 if (!match
->dev
.init_name
)
1255 if (epdrv
->pdrv
->probe(match
))
1256 pr_warn("%s: unable to probe %s early.\n",
1257 class_str
, match
->name
);
1273 * early_platform_driver_probe - probe a class of registered drivers
1274 * @class_str: string to identify early platform driver class
1275 * @nr_probe: number of platform devices to successfully probe before exiting
1276 * @user_only: only probe user specified early platform devices
1278 * Used by architecture code to probe registered early platform drivers
1279 * within a certain class. For probe to happen a registered early platform
1280 * device matching a registered early platform driver is needed.
1282 int __init
early_platform_driver_probe(char *class_str
,
1289 for (i
= -2; n
< nr_probe
; i
++) {
1290 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1305 * early_platform_cleanup - clean up early platform code
1307 void __init
early_platform_cleanup(void)
1309 struct platform_device
*pd
, *pd2
;
1311 /* clean up the devres list used to chain devices */
1312 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1314 list_del(&pd
->dev
.devres_head
);
1315 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));