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>
27 #include <linux/limits.h>
30 #include "power/power.h"
32 /* For automatically allocated device IDs */
33 static DEFINE_IDA(platform_devid_ida
);
35 struct device platform_bus
= {
36 .init_name
= "platform",
38 EXPORT_SYMBOL_GPL(platform_bus
);
41 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
42 * @pdev: platform device
44 * This is called before platform_device_add() such that any pdev_archdata may
45 * be setup before the platform_notifier is called. So if a user needs to
46 * manipulate any relevant information in the pdev_archdata they can do:
48 * platform_device_alloc()
50 * platform_device_add()
52 * And if they don't care they can just call platform_device_register() and
53 * everything will just work out.
55 void __weak
arch_setup_pdev_archdata(struct platform_device
*pdev
)
60 * platform_get_resource - get a resource for a device
61 * @dev: platform device
62 * @type: resource type
63 * @num: resource index
65 struct resource
*platform_get_resource(struct platform_device
*dev
,
66 unsigned int type
, unsigned int num
)
70 for (i
= 0; i
< dev
->num_resources
; i
++) {
71 struct resource
*r
= &dev
->resource
[i
];
73 if (type
== resource_type(r
) && num
-- == 0)
78 EXPORT_SYMBOL_GPL(platform_get_resource
);
81 * platform_get_irq - get an IRQ for a device
82 * @dev: platform device
83 * @num: IRQ number index
85 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
88 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
89 if (!dev
|| num
>= dev
->archdata
.num_irqs
)
91 return dev
->archdata
.irqs
[num
];
94 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
97 ret
= of_irq_get(dev
->dev
.of_node
, num
);
98 if (ret
>= 0 || ret
== -EPROBE_DEFER
)
102 r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
104 return r
? r
->start
: -ENXIO
;
107 EXPORT_SYMBOL_GPL(platform_get_irq
);
110 * platform_get_resource_byname - get a resource for a device by name
111 * @dev: platform device
112 * @type: resource type
113 * @name: resource name
115 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
121 for (i
= 0; i
< dev
->num_resources
; i
++) {
122 struct resource
*r
= &dev
->resource
[i
];
124 if (unlikely(!r
->name
))
127 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
132 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
135 * platform_get_irq_byname - get an IRQ for a device by name
136 * @dev: platform device
139 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
143 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
146 ret
= of_irq_get_byname(dev
->dev
.of_node
, name
);
147 if (ret
>= 0 || ret
== -EPROBE_DEFER
)
151 r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
, name
);
152 return r
? r
->start
: -ENXIO
;
154 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
157 * platform_add_devices - add a numbers of platform devices
158 * @devs: array of platform devices to add
159 * @num: number of platform devices in array
161 int platform_add_devices(struct platform_device
**devs
, int num
)
165 for (i
= 0; i
< num
; i
++) {
166 ret
= platform_device_register(devs
[i
]);
169 platform_device_unregister(devs
[i
]);
176 EXPORT_SYMBOL_GPL(platform_add_devices
);
178 struct platform_object
{
179 struct platform_device pdev
;
184 * platform_device_put - destroy a platform device
185 * @pdev: platform device to free
187 * Free all memory associated with a platform device. This function must
188 * _only_ be externally called in error cases. All other usage is a bug.
190 void platform_device_put(struct platform_device
*pdev
)
193 put_device(&pdev
->dev
);
195 EXPORT_SYMBOL_GPL(platform_device_put
);
197 static void platform_device_release(struct device
*dev
)
199 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
202 of_device_node_put(&pa
->pdev
.dev
);
203 kfree(pa
->pdev
.dev
.platform_data
);
204 kfree(pa
->pdev
.mfd_cell
);
205 kfree(pa
->pdev
.resource
);
206 kfree(pa
->pdev
.driver_override
);
211 * platform_device_alloc - create a platform device
212 * @name: base name of the device we're adding
215 * Create a platform device object which can have other objects attached
216 * to it, and which will have attached objects freed when it is released.
218 struct platform_device
*platform_device_alloc(const char *name
, int id
)
220 struct platform_object
*pa
;
222 pa
= kzalloc(sizeof(*pa
) + strlen(name
) + 1, GFP_KERNEL
);
224 strcpy(pa
->name
, name
);
225 pa
->pdev
.name
= pa
->name
;
227 device_initialize(&pa
->pdev
.dev
);
228 pa
->pdev
.dev
.release
= platform_device_release
;
229 arch_setup_pdev_archdata(&pa
->pdev
);
232 return pa
? &pa
->pdev
: NULL
;
234 EXPORT_SYMBOL_GPL(platform_device_alloc
);
237 * platform_device_add_resources - add resources to a platform device
238 * @pdev: platform device allocated by platform_device_alloc to add resources to
239 * @res: set of resources that needs to be allocated for the device
240 * @num: number of resources
242 * Add a copy of the resources to the platform device. The memory
243 * associated with the resources will be freed when the platform device is
246 int platform_device_add_resources(struct platform_device
*pdev
,
247 const struct resource
*res
, unsigned int num
)
249 struct resource
*r
= NULL
;
252 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
257 kfree(pdev
->resource
);
259 pdev
->num_resources
= num
;
262 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
265 * platform_device_add_data - add platform-specific data to a platform device
266 * @pdev: platform device allocated by platform_device_alloc to add resources to
267 * @data: platform specific data for this platform device
268 * @size: size of platform specific data
270 * Add a copy of platform specific data to the platform device's
271 * platform_data pointer. The memory associated with the platform data
272 * will be freed when the platform device is released.
274 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
280 d
= kmemdup(data
, size
, GFP_KERNEL
);
285 kfree(pdev
->dev
.platform_data
);
286 pdev
->dev
.platform_data
= d
;
289 EXPORT_SYMBOL_GPL(platform_device_add_data
);
292 * platform_device_add - add a platform device to device hierarchy
293 * @pdev: platform device we're adding
295 * This is part 2 of platform_device_register(), though may be called
296 * separately _iff_ pdev was allocated by platform_device_alloc().
298 int platform_device_add(struct platform_device
*pdev
)
305 if (!pdev
->dev
.parent
)
306 pdev
->dev
.parent
= &platform_bus
;
308 pdev
->dev
.bus
= &platform_bus_type
;
312 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
314 case PLATFORM_DEVID_NONE
:
315 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
317 case PLATFORM_DEVID_AUTO
:
319 * Automatically allocated device ID. We mark it as such so
320 * that we remember it must be freed, and we append a suffix
321 * to avoid namespace collision with explicit IDs.
323 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
327 pdev
->id_auto
= true;
328 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
332 for (i
= 0; i
< pdev
->num_resources
; i
++) {
333 struct resource
*p
, *r
= &pdev
->resource
[i
];
336 r
->name
= dev_name(&pdev
->dev
);
340 if (resource_type(r
) == IORESOURCE_MEM
)
342 else if (resource_type(r
) == IORESOURCE_IO
)
343 p
= &ioport_resource
;
346 if (p
&& insert_resource(p
, r
)) {
347 dev_err(&pdev
->dev
, "failed to claim resource %d\n", i
);
353 pr_debug("Registering platform device '%s'. Parent at %s\n",
354 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
356 ret
= device_add(&pdev
->dev
);
362 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
363 pdev
->id
= PLATFORM_DEVID_AUTO
;
367 struct resource
*r
= &pdev
->resource
[i
];
368 unsigned long type
= resource_type(r
);
370 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
377 EXPORT_SYMBOL_GPL(platform_device_add
);
380 * platform_device_del - remove a platform-level device
381 * @pdev: platform device we're removing
383 * Note that this function will also release all memory- and port-based
384 * resources owned by the device (@dev->resource). This function must
385 * _only_ be externally called in error cases. All other usage is a bug.
387 void platform_device_del(struct platform_device
*pdev
)
392 device_del(&pdev
->dev
);
395 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
396 pdev
->id
= PLATFORM_DEVID_AUTO
;
399 for (i
= 0; i
< pdev
->num_resources
; i
++) {
400 struct resource
*r
= &pdev
->resource
[i
];
401 unsigned long type
= resource_type(r
);
403 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
408 EXPORT_SYMBOL_GPL(platform_device_del
);
411 * platform_device_register - add a platform-level device
412 * @pdev: platform device we're adding
414 int platform_device_register(struct platform_device
*pdev
)
416 device_initialize(&pdev
->dev
);
417 arch_setup_pdev_archdata(pdev
);
418 return platform_device_add(pdev
);
420 EXPORT_SYMBOL_GPL(platform_device_register
);
423 * platform_device_unregister - unregister a platform-level device
424 * @pdev: platform device we're unregistering
426 * Unregistration is done in 2 steps. First we release all resources
427 * and remove it from the subsystem, then we drop reference count by
428 * calling platform_device_put().
430 void platform_device_unregister(struct platform_device
*pdev
)
432 platform_device_del(pdev
);
433 platform_device_put(pdev
);
435 EXPORT_SYMBOL_GPL(platform_device_unregister
);
438 * platform_device_register_full - add a platform-level device with
439 * resources and platform-specific data
441 * @pdevinfo: data used to create device
443 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
445 struct platform_device
*platform_device_register_full(
446 const struct platform_device_info
*pdevinfo
)
449 struct platform_device
*pdev
;
451 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
455 pdev
->dev
.parent
= pdevinfo
->parent
;
456 ACPI_COMPANION_SET(&pdev
->dev
, pdevinfo
->acpi_node
.companion
);
458 if (pdevinfo
->dma_mask
) {
460 * This memory isn't freed when the device is put,
461 * I don't have a nice idea for that though. Conceptually
462 * dma_mask in struct device should not be a pointer.
463 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
466 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
467 if (!pdev
->dev
.dma_mask
)
470 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
471 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
474 ret
= platform_device_add_resources(pdev
,
475 pdevinfo
->res
, pdevinfo
->num_res
);
479 ret
= platform_device_add_data(pdev
,
480 pdevinfo
->data
, pdevinfo
->size_data
);
484 ret
= platform_device_add(pdev
);
487 ACPI_COMPANION_SET(&pdev
->dev
, NULL
);
488 kfree(pdev
->dev
.dma_mask
);
491 platform_device_put(pdev
);
497 EXPORT_SYMBOL_GPL(platform_device_register_full
);
499 static int platform_drv_probe(struct device
*_dev
)
501 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
502 struct platform_device
*dev
= to_platform_device(_dev
);
505 ret
= of_clk_set_defaults(_dev
->of_node
, false);
509 acpi_dev_pm_attach(_dev
, true);
511 ret
= drv
->probe(dev
);
513 acpi_dev_pm_detach(_dev
, true);
515 if (drv
->prevent_deferred_probe
&& ret
== -EPROBE_DEFER
) {
516 dev_warn(_dev
, "probe deferral not supported\n");
523 static int platform_drv_probe_fail(struct device
*_dev
)
528 static int platform_drv_remove(struct device
*_dev
)
530 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
531 struct platform_device
*dev
= to_platform_device(_dev
);
534 ret
= drv
->remove(dev
);
535 acpi_dev_pm_detach(_dev
, true);
540 static void platform_drv_shutdown(struct device
*_dev
)
542 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
543 struct platform_device
*dev
= to_platform_device(_dev
);
546 acpi_dev_pm_detach(_dev
, true);
550 * __platform_driver_register - register a driver for platform-level devices
551 * @drv: platform driver structure
552 * @owner: owning module/driver
554 int __platform_driver_register(struct platform_driver
*drv
,
555 struct module
*owner
)
557 drv
->driver
.owner
= owner
;
558 drv
->driver
.bus
= &platform_bus_type
;
560 drv
->driver
.probe
= platform_drv_probe
;
562 drv
->driver
.remove
= platform_drv_remove
;
564 drv
->driver
.shutdown
= platform_drv_shutdown
;
566 return driver_register(&drv
->driver
);
568 EXPORT_SYMBOL_GPL(__platform_driver_register
);
571 * platform_driver_unregister - unregister a driver for platform-level devices
572 * @drv: platform driver structure
574 void platform_driver_unregister(struct platform_driver
*drv
)
576 driver_unregister(&drv
->driver
);
578 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
581 * platform_driver_probe - register driver for non-hotpluggable device
582 * @drv: platform driver structure
583 * @probe: the driver probe routine, probably from an __init section
585 * Use this instead of platform_driver_register() when you know the device
586 * is not hotpluggable and has already been registered, and you want to
587 * remove its run-once probe() infrastructure from memory after the driver
588 * has bound to the device.
590 * One typical use for this would be with drivers for controllers integrated
591 * into system-on-chip processors, where the controller devices have been
592 * configured as part of board setup.
594 * Note that this is incompatible with deferred probing.
596 * Returns zero if the driver registered and bound to a device, else returns
597 * a negative error code and with the driver not registered.
599 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
600 int (*probe
)(struct platform_device
*))
605 * Prevent driver from requesting probe deferral to avoid further
606 * futile probe attempts.
608 drv
->prevent_deferred_probe
= true;
610 /* make sure driver won't have bind/unbind attributes */
611 drv
->driver
.suppress_bind_attrs
= true;
613 /* temporary section violation during probe() */
615 retval
= code
= platform_driver_register(drv
);
618 * Fixup that section violation, being paranoid about code scanning
619 * the list of drivers in order to probe new devices. Check to see
620 * if the probe was successful, and make sure any forced probes of
623 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
625 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
627 drv
->driver
.probe
= platform_drv_probe_fail
;
628 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
631 platform_driver_unregister(drv
);
634 EXPORT_SYMBOL_GPL(platform_driver_probe
);
637 * platform_create_bundle - register driver and create corresponding device
638 * @driver: platform driver structure
639 * @probe: the driver probe routine, probably from an __init section
640 * @res: set of resources that needs to be allocated for the device
641 * @n_res: number of resources
642 * @data: platform specific data for this platform device
643 * @size: size of platform specific data
645 * Use this in legacy-style modules that probe hardware directly and
646 * register a single platform device and corresponding platform driver.
648 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
650 struct platform_device
* __init_or_module
platform_create_bundle(
651 struct platform_driver
*driver
,
652 int (*probe
)(struct platform_device
*),
653 struct resource
*res
, unsigned int n_res
,
654 const void *data
, size_t size
)
656 struct platform_device
*pdev
;
659 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
665 error
= platform_device_add_resources(pdev
, res
, n_res
);
669 error
= platform_device_add_data(pdev
, data
, size
);
673 error
= platform_device_add(pdev
);
677 error
= platform_driver_probe(driver
, probe
);
684 platform_device_del(pdev
);
686 platform_device_put(pdev
);
688 return ERR_PTR(error
);
690 EXPORT_SYMBOL_GPL(platform_create_bundle
);
692 /* modalias support enables more hands-off userspace setup:
693 * (a) environment variable lets new-style hotplug events work once system is
694 * fully running: "modprobe $MODALIAS"
695 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
696 * mishandled before system is fully running: "modprobe $(cat modalias)"
698 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
701 struct platform_device
*pdev
= to_platform_device(dev
);
704 len
= of_device_get_modalias(dev
, buf
, PAGE_SIZE
-1);
708 len
= acpi_device_modalias(dev
, buf
, PAGE_SIZE
-1);
712 len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
714 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
716 static DEVICE_ATTR_RO(modalias
);
718 static ssize_t
driver_override_store(struct device
*dev
,
719 struct device_attribute
*attr
,
720 const char *buf
, size_t count
)
722 struct platform_device
*pdev
= to_platform_device(dev
);
723 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
725 if (count
> PATH_MAX
)
728 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
729 if (!driver_override
)
732 cp
= strchr(driver_override
, '\n');
736 if (strlen(driver_override
)) {
737 pdev
->driver_override
= driver_override
;
739 kfree(driver_override
);
740 pdev
->driver_override
= NULL
;
748 static ssize_t
driver_override_show(struct device
*dev
,
749 struct device_attribute
*attr
, char *buf
)
751 struct platform_device
*pdev
= to_platform_device(dev
);
753 return sprintf(buf
, "%s\n", pdev
->driver_override
);
755 static DEVICE_ATTR_RW(driver_override
);
758 static struct attribute
*platform_dev_attrs
[] = {
759 &dev_attr_modalias
.attr
,
760 &dev_attr_driver_override
.attr
,
763 ATTRIBUTE_GROUPS(platform_dev
);
765 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
767 struct platform_device
*pdev
= to_platform_device(dev
);
770 /* Some devices have extra OF data and an OF-style MODALIAS */
771 rc
= of_device_uevent_modalias(dev
, env
);
775 rc
= acpi_device_uevent_modalias(dev
, env
);
779 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
784 static const struct platform_device_id
*platform_match_id(
785 const struct platform_device_id
*id
,
786 struct platform_device
*pdev
)
788 while (id
->name
[0]) {
789 if (strcmp(pdev
->name
, id
->name
) == 0) {
799 * platform_match - bind platform device to platform driver.
803 * Platform device IDs are assumed to be encoded like this:
804 * "<name><instance>", where <name> is a short description of the type of
805 * device, like "pci" or "floppy", and <instance> is the enumerated
806 * instance of the device, like '0' or '42'. Driver IDs are simply
807 * "<name>". So, extract the <name> from the platform_device structure,
808 * and compare it against the name of the driver. Return whether they match
811 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
813 struct platform_device
*pdev
= to_platform_device(dev
);
814 struct platform_driver
*pdrv
= to_platform_driver(drv
);
816 /* When driver_override is set, only bind to the matching driver */
817 if (pdev
->driver_override
)
818 return !strcmp(pdev
->driver_override
, drv
->name
);
820 /* Attempt an OF style match first */
821 if (of_driver_match_device(dev
, drv
))
824 /* Then try ACPI style match */
825 if (acpi_driver_match_device(dev
, drv
))
828 /* Then try to match against the id table */
830 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
832 /* fall-back to driver name match */
833 return (strcmp(pdev
->name
, drv
->name
) == 0);
836 #ifdef CONFIG_PM_SLEEP
838 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
840 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
841 struct platform_device
*pdev
= to_platform_device(dev
);
844 if (dev
->driver
&& pdrv
->suspend
)
845 ret
= pdrv
->suspend(pdev
, mesg
);
850 static int platform_legacy_resume(struct device
*dev
)
852 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
853 struct platform_device
*pdev
= to_platform_device(dev
);
856 if (dev
->driver
&& pdrv
->resume
)
857 ret
= pdrv
->resume(pdev
);
862 #endif /* CONFIG_PM_SLEEP */
864 #ifdef CONFIG_SUSPEND
866 int platform_pm_suspend(struct device
*dev
)
868 struct device_driver
*drv
= dev
->driver
;
875 if (drv
->pm
->suspend
)
876 ret
= drv
->pm
->suspend(dev
);
878 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
884 int platform_pm_resume(struct device
*dev
)
886 struct device_driver
*drv
= dev
->driver
;
894 ret
= drv
->pm
->resume(dev
);
896 ret
= platform_legacy_resume(dev
);
902 #endif /* CONFIG_SUSPEND */
904 #ifdef CONFIG_HIBERNATE_CALLBACKS
906 int platform_pm_freeze(struct device
*dev
)
908 struct device_driver
*drv
= dev
->driver
;
916 ret
= drv
->pm
->freeze(dev
);
918 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
924 int platform_pm_thaw(struct device
*dev
)
926 struct device_driver
*drv
= dev
->driver
;
934 ret
= drv
->pm
->thaw(dev
);
936 ret
= platform_legacy_resume(dev
);
942 int platform_pm_poweroff(struct device
*dev
)
944 struct device_driver
*drv
= dev
->driver
;
951 if (drv
->pm
->poweroff
)
952 ret
= drv
->pm
->poweroff(dev
);
954 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
960 int platform_pm_restore(struct device
*dev
)
962 struct device_driver
*drv
= dev
->driver
;
969 if (drv
->pm
->restore
)
970 ret
= drv
->pm
->restore(dev
);
972 ret
= platform_legacy_resume(dev
);
978 #endif /* CONFIG_HIBERNATE_CALLBACKS */
980 static const struct dev_pm_ops platform_dev_pm_ops
= {
981 .runtime_suspend
= pm_generic_runtime_suspend
,
982 .runtime_resume
= pm_generic_runtime_resume
,
983 USE_PLATFORM_PM_SLEEP_OPS
986 struct bus_type platform_bus_type
= {
988 .dev_groups
= platform_dev_groups
,
989 .match
= platform_match
,
990 .uevent
= platform_uevent
,
991 .pm
= &platform_dev_pm_ops
,
993 EXPORT_SYMBOL_GPL(platform_bus_type
);
995 int __init
platform_bus_init(void)
999 early_platform_cleanup();
1001 error
= device_register(&platform_bus
);
1004 error
= bus_register(&platform_bus_type
);
1006 device_unregister(&platform_bus
);
1010 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1011 u64
dma_get_required_mask(struct device
*dev
)
1013 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1014 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1017 if (!high_totalram
) {
1018 /* convert to mask just covering totalram */
1019 low_totalram
= (1 << (fls(low_totalram
) - 1));
1020 low_totalram
+= low_totalram
- 1;
1021 mask
= low_totalram
;
1023 high_totalram
= (1 << (fls(high_totalram
) - 1));
1024 high_totalram
+= high_totalram
- 1;
1025 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1029 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1032 static __initdata
LIST_HEAD(early_platform_driver_list
);
1033 static __initdata
LIST_HEAD(early_platform_device_list
);
1036 * early_platform_driver_register - register early platform driver
1037 * @epdrv: early_platform driver structure
1038 * @buf: string passed from early_param()
1040 * Helper function for early_platform_init() / early_platform_init_buffer()
1042 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1048 /* Simply add the driver to the end of the global list.
1049 * Drivers will by default be put on the list in compiled-in order.
1051 if (!epdrv
->list
.next
) {
1052 INIT_LIST_HEAD(&epdrv
->list
);
1053 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1056 /* If the user has specified device then make sure the driver
1057 * gets prioritized. The driver of the last device specified on
1058 * command line will be put first on the list.
1060 n
= strlen(epdrv
->pdrv
->driver
.name
);
1061 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1062 list_move(&epdrv
->list
, &early_platform_driver_list
);
1064 /* Allow passing parameters after device name */
1065 if (buf
[n
] == '\0' || buf
[n
] == ',')
1066 epdrv
->requested_id
= -1;
1068 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1071 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1072 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1075 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1081 if (epdrv
->bufsize
) {
1082 memcpy(epdrv
->buffer
, &buf
[n
],
1083 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1084 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1092 * early_platform_add_devices - adds a number of early platform devices
1093 * @devs: array of early platform devices to add
1094 * @num: number of early platform devices in array
1096 * Used by early architecture code to register early platform devices and
1097 * their platform data.
1099 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1104 /* simply add the devices to list */
1105 for (i
= 0; i
< num
; i
++) {
1106 dev
= &devs
[i
]->dev
;
1108 if (!dev
->devres_head
.next
) {
1109 pm_runtime_early_init(dev
);
1110 INIT_LIST_HEAD(&dev
->devres_head
);
1111 list_add_tail(&dev
->devres_head
,
1112 &early_platform_device_list
);
1118 * early_platform_driver_register_all - register early platform drivers
1119 * @class_str: string to identify early platform driver class
1121 * Used by architecture code to register all early platform drivers
1122 * for a certain class. If omitted then only early platform drivers
1123 * with matching kernel command line class parameters will be registered.
1125 void __init
early_platform_driver_register_all(char *class_str
)
1127 /* The "class_str" parameter may or may not be present on the kernel
1128 * command line. If it is present then there may be more than one
1129 * matching parameter.
1131 * Since we register our early platform drivers using early_param()
1132 * we need to make sure that they also get registered in the case
1133 * when the parameter is missing from the kernel command line.
1135 * We use parse_early_options() to make sure the early_param() gets
1136 * called at least once. The early_param() may be called more than
1137 * once since the name of the preferred device may be specified on
1138 * the kernel command line. early_platform_driver_register() handles
1141 parse_early_options(class_str
);
1145 * early_platform_match - find early platform device matching driver
1146 * @epdrv: early platform driver structure
1147 * @id: id to match against
1149 static struct platform_device
* __init
1150 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1152 struct platform_device
*pd
;
1154 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1155 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1163 * early_platform_left - check if early platform driver has matching devices
1164 * @epdrv: early platform driver structure
1165 * @id: return true if id or above exists
1167 static int __init
early_platform_left(struct early_platform_driver
*epdrv
,
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
))
1181 * early_platform_driver_probe_id - probe drivers matching class_str and id
1182 * @class_str: string to identify early platform driver class
1183 * @id: id to match against
1184 * @nr_probe: number of platform devices to successfully probe before exiting
1186 static int __init
early_platform_driver_probe_id(char *class_str
,
1190 struct early_platform_driver
*epdrv
;
1191 struct platform_device
*match
;
1196 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1197 /* only use drivers matching our class_str */
1198 if (strcmp(class_str
, epdrv
->class_str
))
1202 match_id
= epdrv
->requested_id
;
1207 left
+= early_platform_left(epdrv
, id
);
1209 /* skip requested id */
1210 switch (epdrv
->requested_id
) {
1211 case EARLY_PLATFORM_ID_ERROR
:
1212 case EARLY_PLATFORM_ID_UNSET
:
1215 if (epdrv
->requested_id
== id
)
1216 match_id
= EARLY_PLATFORM_ID_UNSET
;
1221 case EARLY_PLATFORM_ID_ERROR
:
1222 pr_warn("%s: unable to parse %s parameter\n",
1223 class_str
, epdrv
->pdrv
->driver
.name
);
1225 case EARLY_PLATFORM_ID_UNSET
:
1229 match
= early_platform_match(epdrv
, match_id
);
1234 * Set up a sensible init_name to enable
1235 * dev_name() and others to be used before the
1236 * rest of the driver core is initialized.
1238 if (!match
->dev
.init_name
&& slab_is_available()) {
1239 if (match
->id
!= -1)
1240 match
->dev
.init_name
=
1241 kasprintf(GFP_KERNEL
, "%s.%d",
1245 match
->dev
.init_name
=
1246 kasprintf(GFP_KERNEL
, "%s",
1249 if (!match
->dev
.init_name
)
1253 if (epdrv
->pdrv
->probe(match
))
1254 pr_warn("%s: unable to probe %s early.\n",
1255 class_str
, match
->name
);
1271 * early_platform_driver_probe - probe a class of registered drivers
1272 * @class_str: string to identify early platform driver class
1273 * @nr_probe: number of platform devices to successfully probe before exiting
1274 * @user_only: only probe user specified early platform devices
1276 * Used by architecture code to probe registered early platform drivers
1277 * within a certain class. For probe to happen a registered early platform
1278 * device matching a registered early platform driver is needed.
1280 int __init
early_platform_driver_probe(char *class_str
,
1287 for (i
= -2; n
< nr_probe
; i
++) {
1288 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1303 * early_platform_cleanup - clean up early platform code
1305 void __init
early_platform_cleanup(void)
1307 struct platform_device
*pd
, *pd2
;
1309 /* clean up the devres list used to chain devices */
1310 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1312 list_del(&pd
->dev
.devres_head
);
1313 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));