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/limits.h>
29 #include "power/power.h"
31 /* For automatically allocated device IDs */
32 static DEFINE_IDA(platform_devid_ida
);
34 struct device platform_bus
= {
35 .init_name
= "platform",
37 EXPORT_SYMBOL_GPL(platform_bus
);
40 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
41 * @pdev: platform device
43 * This is called before platform_device_add() such that any pdev_archdata may
44 * be setup before the platform_notifier is called. So if a user needs to
45 * manipulate any relevant information in the pdev_archdata they can do:
47 * platform_device_alloc()
49 * platform_device_add()
51 * And if they don't care they can just call platform_device_register() and
52 * everything will just work out.
54 void __weak
arch_setup_pdev_archdata(struct platform_device
*pdev
)
59 * platform_get_resource - get a resource for a device
60 * @dev: platform device
61 * @type: resource type
62 * @num: resource index
64 struct resource
*platform_get_resource(struct platform_device
*dev
,
65 unsigned int type
, unsigned int num
)
69 for (i
= 0; i
< dev
->num_resources
; i
++) {
70 struct resource
*r
= &dev
->resource
[i
];
72 if (type
== resource_type(r
) && num
-- == 0)
77 EXPORT_SYMBOL_GPL(platform_get_resource
);
80 * platform_get_irq - get an IRQ for a device
81 * @dev: platform device
82 * @num: IRQ number index
84 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
87 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
88 if (!dev
|| num
>= dev
->archdata
.num_irqs
)
90 return dev
->archdata
.irqs
[num
];
93 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
96 ret
= of_irq_get(dev
->dev
.of_node
, num
);
97 if (ret
>= 0 || ret
== -EPROBE_DEFER
)
101 r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
103 return r
? r
->start
: -ENXIO
;
106 EXPORT_SYMBOL_GPL(platform_get_irq
);
109 * platform_get_resource_byname - get a resource for a device by name
110 * @dev: platform device
111 * @type: resource type
112 * @name: resource name
114 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
120 for (i
= 0; i
< dev
->num_resources
; i
++) {
121 struct resource
*r
= &dev
->resource
[i
];
123 if (unlikely(!r
->name
))
126 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
131 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
134 * platform_get_irq_byname - get an IRQ for a device by name
135 * @dev: platform device
138 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
142 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
145 ret
= of_irq_get_byname(dev
->dev
.of_node
, name
);
146 if (ret
>= 0 || ret
== -EPROBE_DEFER
)
150 r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
, name
);
151 return r
? r
->start
: -ENXIO
;
153 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
156 * platform_add_devices - add a numbers of platform devices
157 * @devs: array of platform devices to add
158 * @num: number of platform devices in array
160 int platform_add_devices(struct platform_device
**devs
, int num
)
164 for (i
= 0; i
< num
; i
++) {
165 ret
= platform_device_register(devs
[i
]);
168 platform_device_unregister(devs
[i
]);
175 EXPORT_SYMBOL_GPL(platform_add_devices
);
177 struct platform_object
{
178 struct platform_device pdev
;
183 * platform_device_put - destroy a platform device
184 * @pdev: platform device to free
186 * Free all memory associated with a platform device. This function must
187 * _only_ be externally called in error cases. All other usage is a bug.
189 void platform_device_put(struct platform_device
*pdev
)
192 put_device(&pdev
->dev
);
194 EXPORT_SYMBOL_GPL(platform_device_put
);
196 static void platform_device_release(struct device
*dev
)
198 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
201 of_device_node_put(&pa
->pdev
.dev
);
202 kfree(pa
->pdev
.dev
.platform_data
);
203 kfree(pa
->pdev
.mfd_cell
);
204 kfree(pa
->pdev
.resource
);
205 kfree(pa
->pdev
.driver_override
);
210 * platform_device_alloc - create a platform device
211 * @name: base name of the device we're adding
214 * Create a platform device object which can have other objects attached
215 * to it, and which will have attached objects freed when it is released.
217 struct platform_device
*platform_device_alloc(const char *name
, int id
)
219 struct platform_object
*pa
;
221 pa
= kzalloc(sizeof(*pa
) + strlen(name
) + 1, GFP_KERNEL
);
223 strcpy(pa
->name
, name
);
224 pa
->pdev
.name
= pa
->name
;
226 device_initialize(&pa
->pdev
.dev
);
227 pa
->pdev
.dev
.release
= platform_device_release
;
228 arch_setup_pdev_archdata(&pa
->pdev
);
231 return pa
? &pa
->pdev
: NULL
;
233 EXPORT_SYMBOL_GPL(platform_device_alloc
);
236 * platform_device_add_resources - add resources to a platform device
237 * @pdev: platform device allocated by platform_device_alloc to add resources to
238 * @res: set of resources that needs to be allocated for the device
239 * @num: number of resources
241 * Add a copy of the resources to the platform device. The memory
242 * associated with the resources will be freed when the platform device is
245 int platform_device_add_resources(struct platform_device
*pdev
,
246 const struct resource
*res
, unsigned int num
)
248 struct resource
*r
= NULL
;
251 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
256 kfree(pdev
->resource
);
258 pdev
->num_resources
= num
;
261 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
264 * platform_device_add_data - add platform-specific data to a platform device
265 * @pdev: platform device allocated by platform_device_alloc to add resources to
266 * @data: platform specific data for this platform device
267 * @size: size of platform specific data
269 * Add a copy of platform specific data to the platform device's
270 * platform_data pointer. The memory associated with the platform data
271 * will be freed when the platform device is released.
273 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
279 d
= kmemdup(data
, size
, GFP_KERNEL
);
284 kfree(pdev
->dev
.platform_data
);
285 pdev
->dev
.platform_data
= d
;
288 EXPORT_SYMBOL_GPL(platform_device_add_data
);
291 * platform_device_add - add a platform device to device hierarchy
292 * @pdev: platform device we're adding
294 * This is part 2 of platform_device_register(), though may be called
295 * separately _iff_ pdev was allocated by platform_device_alloc().
297 int platform_device_add(struct platform_device
*pdev
)
304 if (!pdev
->dev
.parent
)
305 pdev
->dev
.parent
= &platform_bus
;
307 pdev
->dev
.bus
= &platform_bus_type
;
311 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
313 case PLATFORM_DEVID_NONE
:
314 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
316 case PLATFORM_DEVID_AUTO
:
318 * Automatically allocated device ID. We mark it as such so
319 * that we remember it must be freed, and we append a suffix
320 * to avoid namespace collision with explicit IDs.
322 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
326 pdev
->id_auto
= true;
327 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
331 for (i
= 0; i
< pdev
->num_resources
; i
++) {
332 struct resource
*p
, *r
= &pdev
->resource
[i
];
335 r
->name
= dev_name(&pdev
->dev
);
339 if (resource_type(r
) == IORESOURCE_MEM
)
341 else if (resource_type(r
) == IORESOURCE_IO
)
342 p
= &ioport_resource
;
345 if (p
&& insert_resource(p
, r
)) {
346 dev_err(&pdev
->dev
, "failed to claim resource %d\n", i
);
352 pr_debug("Registering platform device '%s'. Parent at %s\n",
353 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
355 ret
= device_add(&pdev
->dev
);
361 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
362 pdev
->id
= PLATFORM_DEVID_AUTO
;
366 struct resource
*r
= &pdev
->resource
[i
];
367 unsigned long type
= resource_type(r
);
369 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
376 EXPORT_SYMBOL_GPL(platform_device_add
);
379 * platform_device_del - remove a platform-level device
380 * @pdev: platform device we're removing
382 * Note that this function will also release all memory- and port-based
383 * resources owned by the device (@dev->resource). This function must
384 * _only_ be externally called in error cases. All other usage is a bug.
386 void platform_device_del(struct platform_device
*pdev
)
391 device_del(&pdev
->dev
);
394 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
395 pdev
->id
= PLATFORM_DEVID_AUTO
;
398 for (i
= 0; i
< pdev
->num_resources
; i
++) {
399 struct resource
*r
= &pdev
->resource
[i
];
400 unsigned long type
= resource_type(r
);
402 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
407 EXPORT_SYMBOL_GPL(platform_device_del
);
410 * platform_device_register - add a platform-level device
411 * @pdev: platform device we're adding
413 int platform_device_register(struct platform_device
*pdev
)
415 device_initialize(&pdev
->dev
);
416 arch_setup_pdev_archdata(pdev
);
417 return platform_device_add(pdev
);
419 EXPORT_SYMBOL_GPL(platform_device_register
);
422 * platform_device_unregister - unregister a platform-level device
423 * @pdev: platform device we're unregistering
425 * Unregistration is done in 2 steps. First we release all resources
426 * and remove it from the subsystem, then we drop reference count by
427 * calling platform_device_put().
429 void platform_device_unregister(struct platform_device
*pdev
)
431 platform_device_del(pdev
);
432 platform_device_put(pdev
);
434 EXPORT_SYMBOL_GPL(platform_device_unregister
);
437 * platform_device_register_full - add a platform-level device with
438 * resources and platform-specific data
440 * @pdevinfo: data used to create device
442 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
444 struct platform_device
*platform_device_register_full(
445 const struct platform_device_info
*pdevinfo
)
448 struct platform_device
*pdev
;
450 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
454 pdev
->dev
.parent
= pdevinfo
->parent
;
455 ACPI_COMPANION_SET(&pdev
->dev
, pdevinfo
->acpi_node
.companion
);
457 if (pdevinfo
->dma_mask
) {
459 * This memory isn't freed when the device is put,
460 * I don't have a nice idea for that though. Conceptually
461 * dma_mask in struct device should not be a pointer.
462 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
465 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
466 if (!pdev
->dev
.dma_mask
)
469 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
470 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
473 ret
= platform_device_add_resources(pdev
,
474 pdevinfo
->res
, pdevinfo
->num_res
);
478 ret
= platform_device_add_data(pdev
,
479 pdevinfo
->data
, pdevinfo
->size_data
);
483 ret
= platform_device_add(pdev
);
486 ACPI_COMPANION_SET(&pdev
->dev
, NULL
);
487 kfree(pdev
->dev
.dma_mask
);
490 platform_device_put(pdev
);
496 EXPORT_SYMBOL_GPL(platform_device_register_full
);
498 static int platform_drv_probe(struct device
*_dev
)
500 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
501 struct platform_device
*dev
= to_platform_device(_dev
);
504 acpi_dev_pm_attach(_dev
, true);
506 ret
= drv
->probe(dev
);
508 acpi_dev_pm_detach(_dev
, true);
510 if (drv
->prevent_deferred_probe
&& ret
== -EPROBE_DEFER
) {
511 dev_warn(_dev
, "probe deferral not supported\n");
518 static int platform_drv_probe_fail(struct device
*_dev
)
523 static int platform_drv_remove(struct device
*_dev
)
525 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
526 struct platform_device
*dev
= to_platform_device(_dev
);
529 ret
= drv
->remove(dev
);
530 acpi_dev_pm_detach(_dev
, true);
535 static void platform_drv_shutdown(struct device
*_dev
)
537 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
538 struct platform_device
*dev
= to_platform_device(_dev
);
541 acpi_dev_pm_detach(_dev
, true);
545 * __platform_driver_register - register a driver for platform-level devices
546 * @drv: platform driver structure
547 * @owner: owning module/driver
549 int __platform_driver_register(struct platform_driver
*drv
,
550 struct module
*owner
)
552 drv
->driver
.owner
= owner
;
553 drv
->driver
.bus
= &platform_bus_type
;
555 drv
->driver
.probe
= platform_drv_probe
;
557 drv
->driver
.remove
= platform_drv_remove
;
559 drv
->driver
.shutdown
= platform_drv_shutdown
;
561 return driver_register(&drv
->driver
);
563 EXPORT_SYMBOL_GPL(__platform_driver_register
);
566 * platform_driver_unregister - unregister a driver for platform-level devices
567 * @drv: platform driver structure
569 void platform_driver_unregister(struct platform_driver
*drv
)
571 driver_unregister(&drv
->driver
);
573 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
576 * platform_driver_probe - register driver for non-hotpluggable device
577 * @drv: platform driver structure
578 * @probe: the driver probe routine, probably from an __init section
580 * Use this instead of platform_driver_register() when you know the device
581 * is not hotpluggable and has already been registered, and you want to
582 * remove its run-once probe() infrastructure from memory after the driver
583 * has bound to the device.
585 * One typical use for this would be with drivers for controllers integrated
586 * into system-on-chip processors, where the controller devices have been
587 * configured as part of board setup.
589 * Note that this is incompatible with deferred probing.
591 * Returns zero if the driver registered and bound to a device, else returns
592 * a negative error code and with the driver not registered.
594 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
595 int (*probe
)(struct platform_device
*))
600 * Prevent driver from requesting probe deferral to avoid further
601 * futile probe attempts.
603 drv
->prevent_deferred_probe
= true;
605 /* make sure driver won't have bind/unbind attributes */
606 drv
->driver
.suppress_bind_attrs
= true;
608 /* temporary section violation during probe() */
610 retval
= code
= platform_driver_register(drv
);
613 * Fixup that section violation, being paranoid about code scanning
614 * the list of drivers in order to probe new devices. Check to see
615 * if the probe was successful, and make sure any forced probes of
618 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
620 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
622 drv
->driver
.probe
= platform_drv_probe_fail
;
623 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
626 platform_driver_unregister(drv
);
629 EXPORT_SYMBOL_GPL(platform_driver_probe
);
632 * platform_create_bundle - register driver and create corresponding device
633 * @driver: platform driver structure
634 * @probe: the driver probe routine, probably from an __init section
635 * @res: set of resources that needs to be allocated for the device
636 * @n_res: number of resources
637 * @data: platform specific data for this platform device
638 * @size: size of platform specific data
640 * Use this in legacy-style modules that probe hardware directly and
641 * register a single platform device and corresponding platform driver.
643 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
645 struct platform_device
* __init_or_module
platform_create_bundle(
646 struct platform_driver
*driver
,
647 int (*probe
)(struct platform_device
*),
648 struct resource
*res
, unsigned int n_res
,
649 const void *data
, size_t size
)
651 struct platform_device
*pdev
;
654 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
660 error
= platform_device_add_resources(pdev
, res
, n_res
);
664 error
= platform_device_add_data(pdev
, data
, size
);
668 error
= platform_device_add(pdev
);
672 error
= platform_driver_probe(driver
, probe
);
679 platform_device_del(pdev
);
681 platform_device_put(pdev
);
683 return ERR_PTR(error
);
685 EXPORT_SYMBOL_GPL(platform_create_bundle
);
687 /* modalias support enables more hands-off userspace setup:
688 * (a) environment variable lets new-style hotplug events work once system is
689 * fully running: "modprobe $MODALIAS"
690 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
691 * mishandled before system is fully running: "modprobe $(cat modalias)"
693 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
696 struct platform_device
*pdev
= to_platform_device(dev
);
699 len
= of_device_get_modalias(dev
, buf
, PAGE_SIZE
-1);
703 len
= acpi_device_modalias(dev
, buf
, PAGE_SIZE
-1);
707 len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
709 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
711 static DEVICE_ATTR_RO(modalias
);
713 static ssize_t
driver_override_store(struct device
*dev
,
714 struct device_attribute
*attr
,
715 const char *buf
, size_t count
)
717 struct platform_device
*pdev
= to_platform_device(dev
);
718 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
720 if (count
> PATH_MAX
)
723 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
724 if (!driver_override
)
727 cp
= strchr(driver_override
, '\n');
731 if (strlen(driver_override
)) {
732 pdev
->driver_override
= driver_override
;
734 kfree(driver_override
);
735 pdev
->driver_override
= NULL
;
743 static ssize_t
driver_override_show(struct device
*dev
,
744 struct device_attribute
*attr
, char *buf
)
746 struct platform_device
*pdev
= to_platform_device(dev
);
748 return sprintf(buf
, "%s\n", pdev
->driver_override
);
750 static DEVICE_ATTR_RW(driver_override
);
753 static struct attribute
*platform_dev_attrs
[] = {
754 &dev_attr_modalias
.attr
,
755 &dev_attr_driver_override
.attr
,
758 ATTRIBUTE_GROUPS(platform_dev
);
760 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
762 struct platform_device
*pdev
= to_platform_device(dev
);
765 /* Some devices have extra OF data and an OF-style MODALIAS */
766 rc
= of_device_uevent_modalias(dev
, env
);
770 rc
= acpi_device_uevent_modalias(dev
, env
);
774 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
779 static const struct platform_device_id
*platform_match_id(
780 const struct platform_device_id
*id
,
781 struct platform_device
*pdev
)
783 while (id
->name
[0]) {
784 if (strcmp(pdev
->name
, id
->name
) == 0) {
794 * platform_match - bind platform device to platform driver.
798 * Platform device IDs are assumed to be encoded like this:
799 * "<name><instance>", where <name> is a short description of the type of
800 * device, like "pci" or "floppy", and <instance> is the enumerated
801 * instance of the device, like '0' or '42'. Driver IDs are simply
802 * "<name>". So, extract the <name> from the platform_device structure,
803 * and compare it against the name of the driver. Return whether they match
806 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
808 struct platform_device
*pdev
= to_platform_device(dev
);
809 struct platform_driver
*pdrv
= to_platform_driver(drv
);
811 /* When driver_override is set, only bind to the matching driver */
812 if (pdev
->driver_override
)
813 return !strcmp(pdev
->driver_override
, drv
->name
);
815 /* Attempt an OF style match first */
816 if (of_driver_match_device(dev
, drv
))
819 /* Then try ACPI style match */
820 if (acpi_driver_match_device(dev
, drv
))
823 /* Then try to match against the id table */
825 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
827 /* fall-back to driver name match */
828 return (strcmp(pdev
->name
, drv
->name
) == 0);
831 #ifdef CONFIG_PM_SLEEP
833 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
835 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
836 struct platform_device
*pdev
= to_platform_device(dev
);
839 if (dev
->driver
&& pdrv
->suspend
)
840 ret
= pdrv
->suspend(pdev
, mesg
);
845 static int platform_legacy_resume(struct device
*dev
)
847 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
848 struct platform_device
*pdev
= to_platform_device(dev
);
851 if (dev
->driver
&& pdrv
->resume
)
852 ret
= pdrv
->resume(pdev
);
857 #endif /* CONFIG_PM_SLEEP */
859 #ifdef CONFIG_SUSPEND
861 int platform_pm_suspend(struct device
*dev
)
863 struct device_driver
*drv
= dev
->driver
;
870 if (drv
->pm
->suspend
)
871 ret
= drv
->pm
->suspend(dev
);
873 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
879 int platform_pm_resume(struct device
*dev
)
881 struct device_driver
*drv
= dev
->driver
;
889 ret
= drv
->pm
->resume(dev
);
891 ret
= platform_legacy_resume(dev
);
897 #endif /* CONFIG_SUSPEND */
899 #ifdef CONFIG_HIBERNATE_CALLBACKS
901 int platform_pm_freeze(struct device
*dev
)
903 struct device_driver
*drv
= dev
->driver
;
911 ret
= drv
->pm
->freeze(dev
);
913 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
919 int platform_pm_thaw(struct device
*dev
)
921 struct device_driver
*drv
= dev
->driver
;
929 ret
= drv
->pm
->thaw(dev
);
931 ret
= platform_legacy_resume(dev
);
937 int platform_pm_poweroff(struct device
*dev
)
939 struct device_driver
*drv
= dev
->driver
;
946 if (drv
->pm
->poweroff
)
947 ret
= drv
->pm
->poweroff(dev
);
949 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
955 int platform_pm_restore(struct device
*dev
)
957 struct device_driver
*drv
= dev
->driver
;
964 if (drv
->pm
->restore
)
965 ret
= drv
->pm
->restore(dev
);
967 ret
= platform_legacy_resume(dev
);
973 #endif /* CONFIG_HIBERNATE_CALLBACKS */
975 static const struct dev_pm_ops platform_dev_pm_ops
= {
976 .runtime_suspend
= pm_generic_runtime_suspend
,
977 .runtime_resume
= pm_generic_runtime_resume
,
978 USE_PLATFORM_PM_SLEEP_OPS
981 struct bus_type platform_bus_type
= {
983 .dev_groups
= platform_dev_groups
,
984 .match
= platform_match
,
985 .uevent
= platform_uevent
,
986 .pm
= &platform_dev_pm_ops
,
988 EXPORT_SYMBOL_GPL(platform_bus_type
);
990 int __init
platform_bus_init(void)
994 early_platform_cleanup();
996 error
= device_register(&platform_bus
);
999 error
= bus_register(&platform_bus_type
);
1001 device_unregister(&platform_bus
);
1005 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1006 u64
dma_get_required_mask(struct device
*dev
)
1008 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1009 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1012 if (!high_totalram
) {
1013 /* convert to mask just covering totalram */
1014 low_totalram
= (1 << (fls(low_totalram
) - 1));
1015 low_totalram
+= low_totalram
- 1;
1016 mask
= low_totalram
;
1018 high_totalram
= (1 << (fls(high_totalram
) - 1));
1019 high_totalram
+= high_totalram
- 1;
1020 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1024 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1027 static __initdata
LIST_HEAD(early_platform_driver_list
);
1028 static __initdata
LIST_HEAD(early_platform_device_list
);
1031 * early_platform_driver_register - register early platform driver
1032 * @epdrv: early_platform driver structure
1033 * @buf: string passed from early_param()
1035 * Helper function for early_platform_init() / early_platform_init_buffer()
1037 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1043 /* Simply add the driver to the end of the global list.
1044 * Drivers will by default be put on the list in compiled-in order.
1046 if (!epdrv
->list
.next
) {
1047 INIT_LIST_HEAD(&epdrv
->list
);
1048 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1051 /* If the user has specified device then make sure the driver
1052 * gets prioritized. The driver of the last device specified on
1053 * command line will be put first on the list.
1055 n
= strlen(epdrv
->pdrv
->driver
.name
);
1056 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1057 list_move(&epdrv
->list
, &early_platform_driver_list
);
1059 /* Allow passing parameters after device name */
1060 if (buf
[n
] == '\0' || buf
[n
] == ',')
1061 epdrv
->requested_id
= -1;
1063 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1066 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1067 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1070 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1076 if (epdrv
->bufsize
) {
1077 memcpy(epdrv
->buffer
, &buf
[n
],
1078 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1079 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1087 * early_platform_add_devices - adds a number of early platform devices
1088 * @devs: array of early platform devices to add
1089 * @num: number of early platform devices in array
1091 * Used by early architecture code to register early platform devices and
1092 * their platform data.
1094 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1099 /* simply add the devices to list */
1100 for (i
= 0; i
< num
; i
++) {
1101 dev
= &devs
[i
]->dev
;
1103 if (!dev
->devres_head
.next
) {
1104 pm_runtime_early_init(dev
);
1105 INIT_LIST_HEAD(&dev
->devres_head
);
1106 list_add_tail(&dev
->devres_head
,
1107 &early_platform_device_list
);
1113 * early_platform_driver_register_all - register early platform drivers
1114 * @class_str: string to identify early platform driver class
1116 * Used by architecture code to register all early platform drivers
1117 * for a certain class. If omitted then only early platform drivers
1118 * with matching kernel command line class parameters will be registered.
1120 void __init
early_platform_driver_register_all(char *class_str
)
1122 /* The "class_str" parameter may or may not be present on the kernel
1123 * command line. If it is present then there may be more than one
1124 * matching parameter.
1126 * Since we register our early platform drivers using early_param()
1127 * we need to make sure that they also get registered in the case
1128 * when the parameter is missing from the kernel command line.
1130 * We use parse_early_options() to make sure the early_param() gets
1131 * called at least once. The early_param() may be called more than
1132 * once since the name of the preferred device may be specified on
1133 * the kernel command line. early_platform_driver_register() handles
1136 parse_early_options(class_str
);
1140 * early_platform_match - find early platform device matching driver
1141 * @epdrv: early platform driver structure
1142 * @id: id to match against
1144 static struct platform_device
* __init
1145 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1147 struct platform_device
*pd
;
1149 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1150 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1158 * early_platform_left - check if early platform driver has matching devices
1159 * @epdrv: early platform driver structure
1160 * @id: return true if id or above exists
1162 static int __init
early_platform_left(struct early_platform_driver
*epdrv
,
1165 struct platform_device
*pd
;
1167 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1168 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1176 * early_platform_driver_probe_id - probe drivers matching class_str and id
1177 * @class_str: string to identify early platform driver class
1178 * @id: id to match against
1179 * @nr_probe: number of platform devices to successfully probe before exiting
1181 static int __init
early_platform_driver_probe_id(char *class_str
,
1185 struct early_platform_driver
*epdrv
;
1186 struct platform_device
*match
;
1191 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1192 /* only use drivers matching our class_str */
1193 if (strcmp(class_str
, epdrv
->class_str
))
1197 match_id
= epdrv
->requested_id
;
1202 left
+= early_platform_left(epdrv
, id
);
1204 /* skip requested id */
1205 switch (epdrv
->requested_id
) {
1206 case EARLY_PLATFORM_ID_ERROR
:
1207 case EARLY_PLATFORM_ID_UNSET
:
1210 if (epdrv
->requested_id
== id
)
1211 match_id
= EARLY_PLATFORM_ID_UNSET
;
1216 case EARLY_PLATFORM_ID_ERROR
:
1217 pr_warn("%s: unable to parse %s parameter\n",
1218 class_str
, epdrv
->pdrv
->driver
.name
);
1220 case EARLY_PLATFORM_ID_UNSET
:
1224 match
= early_platform_match(epdrv
, match_id
);
1229 * Set up a sensible init_name to enable
1230 * dev_name() and others to be used before the
1231 * rest of the driver core is initialized.
1233 if (!match
->dev
.init_name
&& slab_is_available()) {
1234 if (match
->id
!= -1)
1235 match
->dev
.init_name
=
1236 kasprintf(GFP_KERNEL
, "%s.%d",
1240 match
->dev
.init_name
=
1241 kasprintf(GFP_KERNEL
, "%s",
1244 if (!match
->dev
.init_name
)
1248 if (epdrv
->pdrv
->probe(match
))
1249 pr_warn("%s: unable to probe %s early.\n",
1250 class_str
, match
->name
);
1266 * early_platform_driver_probe - probe a class of registered drivers
1267 * @class_str: string to identify early platform driver class
1268 * @nr_probe: number of platform devices to successfully probe before exiting
1269 * @user_only: only probe user specified early platform devices
1271 * Used by architecture code to probe registered early platform drivers
1272 * within a certain class. For probe to happen a registered early platform
1273 * device matching a registered early platform driver is needed.
1275 int __init
early_platform_driver_probe(char *class_str
,
1282 for (i
= -2; n
< nr_probe
; i
++) {
1283 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1298 * early_platform_cleanup - clean up early platform code
1300 void __init
early_platform_cleanup(void)
1302 struct platform_device
*pd
, *pd2
;
1304 /* clean up the devres list used to chain devices */
1305 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1307 list_del(&pd
->dev
.devres_head
);
1308 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));