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/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>
23 #include <linux/idr.h>
24 #include <linux/acpi.h>
27 #include "power/power.h"
29 /* For automatically allocated device IDs */
30 static DEFINE_IDA(platform_devid_ida
);
32 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
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
];
93 struct resource
*r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
95 return r
? r
->start
: -ENXIO
;
98 EXPORT_SYMBOL_GPL(platform_get_irq
);
101 * platform_get_resource_byname - get a resource for a device by name
102 * @dev: platform device
103 * @type: resource type
104 * @name: resource name
106 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
112 for (i
= 0; i
< dev
->num_resources
; i
++) {
113 struct resource
*r
= &dev
->resource
[i
];
115 if (unlikely(!r
->name
))
118 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
123 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
126 * platform_get_irq_byname - get an IRQ for a device by name
127 * @dev: platform device
130 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
132 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
,
135 return r
? r
->start
: -ENXIO
;
137 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
140 * platform_add_devices - add a numbers of platform devices
141 * @devs: array of platform devices to add
142 * @num: number of platform devices in array
144 int platform_add_devices(struct platform_device
**devs
, int num
)
148 for (i
= 0; i
< num
; i
++) {
149 ret
= platform_device_register(devs
[i
]);
152 platform_device_unregister(devs
[i
]);
159 EXPORT_SYMBOL_GPL(platform_add_devices
);
161 struct platform_object
{
162 struct platform_device pdev
;
167 * platform_device_put - destroy a platform device
168 * @pdev: platform device to free
170 * Free all memory associated with a platform device. This function must
171 * _only_ be externally called in error cases. All other usage is a bug.
173 void platform_device_put(struct platform_device
*pdev
)
176 put_device(&pdev
->dev
);
178 EXPORT_SYMBOL_GPL(platform_device_put
);
180 static void platform_device_release(struct device
*dev
)
182 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
185 of_device_node_put(&pa
->pdev
.dev
);
186 kfree(pa
->pdev
.dev
.platform_data
);
187 kfree(pa
->pdev
.mfd_cell
);
188 kfree(pa
->pdev
.resource
);
193 * platform_device_alloc - create a platform device
194 * @name: base name of the device we're adding
197 * Create a platform device object which can have other objects attached
198 * to it, and which will have attached objects freed when it is released.
200 struct platform_device
*platform_device_alloc(const char *name
, int id
)
202 struct platform_object
*pa
;
204 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
206 strcpy(pa
->name
, name
);
207 pa
->pdev
.name
= pa
->name
;
209 device_initialize(&pa
->pdev
.dev
);
210 pa
->pdev
.dev
.release
= platform_device_release
;
211 arch_setup_pdev_archdata(&pa
->pdev
);
214 return pa
? &pa
->pdev
: NULL
;
216 EXPORT_SYMBOL_GPL(platform_device_alloc
);
219 * platform_device_add_resources - add resources to a platform device
220 * @pdev: platform device allocated by platform_device_alloc to add resources to
221 * @res: set of resources that needs to be allocated for the device
222 * @num: number of resources
224 * Add a copy of the resources to the platform device. The memory
225 * associated with the resources will be freed when the platform device is
228 int platform_device_add_resources(struct platform_device
*pdev
,
229 const struct resource
*res
, unsigned int num
)
231 struct resource
*r
= NULL
;
234 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
239 kfree(pdev
->resource
);
241 pdev
->num_resources
= num
;
244 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
247 * platform_device_add_data - add platform-specific data to a platform device
248 * @pdev: platform device allocated by platform_device_alloc to add resources to
249 * @data: platform specific data for this platform device
250 * @size: size of platform specific data
252 * Add a copy of platform specific data to the platform device's
253 * platform_data pointer. The memory associated with the platform data
254 * will be freed when the platform device is released.
256 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
262 d
= kmemdup(data
, size
, GFP_KERNEL
);
267 kfree(pdev
->dev
.platform_data
);
268 pdev
->dev
.platform_data
= d
;
271 EXPORT_SYMBOL_GPL(platform_device_add_data
);
274 * platform_device_add - add a platform device to device hierarchy
275 * @pdev: platform device we're adding
277 * This is part 2 of platform_device_register(), though may be called
278 * separately _iff_ pdev was allocated by platform_device_alloc().
280 int platform_device_add(struct platform_device
*pdev
)
287 if (!pdev
->dev
.parent
)
288 pdev
->dev
.parent
= &platform_bus
;
290 pdev
->dev
.bus
= &platform_bus_type
;
294 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
296 case PLATFORM_DEVID_NONE
:
297 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
299 case PLATFORM_DEVID_AUTO
:
301 * Automatically allocated device ID. We mark it as such so
302 * that we remember it must be freed, and we append a suffix
303 * to avoid namespace collision with explicit IDs.
305 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
309 pdev
->id_auto
= true;
310 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
314 for (i
= 0; i
< pdev
->num_resources
; i
++) {
315 struct resource
*p
, *r
= &pdev
->resource
[i
];
318 r
->name
= dev_name(&pdev
->dev
);
322 if (resource_type(r
) == IORESOURCE_MEM
)
324 else if (resource_type(r
) == IORESOURCE_IO
)
325 p
= &ioport_resource
;
328 if (p
&& insert_resource(p
, r
)) {
329 dev_err(&pdev
->dev
, "failed to claim resource %d\n", i
);
335 pr_debug("Registering platform device '%s'. Parent at %s\n",
336 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
338 ret
= device_add(&pdev
->dev
);
344 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
345 pdev
->id
= PLATFORM_DEVID_AUTO
;
349 struct resource
*r
= &pdev
->resource
[i
];
357 EXPORT_SYMBOL_GPL(platform_device_add
);
360 * platform_device_del - remove a platform-level device
361 * @pdev: platform device we're removing
363 * Note that this function will also release all memory- and port-based
364 * resources owned by the device (@dev->resource). This function must
365 * _only_ be externally called in error cases. All other usage is a bug.
367 void platform_device_del(struct platform_device
*pdev
)
372 device_del(&pdev
->dev
);
375 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
376 pdev
->id
= PLATFORM_DEVID_AUTO
;
379 for (i
= 0; i
< pdev
->num_resources
; i
++) {
380 struct resource
*r
= &pdev
->resource
[i
];
386 EXPORT_SYMBOL_GPL(platform_device_del
);
389 * platform_device_register - add a platform-level device
390 * @pdev: platform device we're adding
392 int platform_device_register(struct platform_device
*pdev
)
394 device_initialize(&pdev
->dev
);
395 arch_setup_pdev_archdata(pdev
);
396 return platform_device_add(pdev
);
398 EXPORT_SYMBOL_GPL(platform_device_register
);
401 * platform_device_unregister - unregister a platform-level device
402 * @pdev: platform device we're unregistering
404 * Unregistration is done in 2 steps. First we release all resources
405 * and remove it from the subsystem, then we drop reference count by
406 * calling platform_device_put().
408 void platform_device_unregister(struct platform_device
*pdev
)
410 platform_device_del(pdev
);
411 platform_device_put(pdev
);
413 EXPORT_SYMBOL_GPL(platform_device_unregister
);
416 * platform_device_register_full - add a platform-level device with
417 * resources and platform-specific data
419 * @pdevinfo: data used to create device
421 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
423 struct platform_device
*platform_device_register_full(
424 const struct platform_device_info
*pdevinfo
)
427 struct platform_device
*pdev
;
429 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
433 pdev
->dev
.parent
= pdevinfo
->parent
;
434 ACPI_HANDLE_SET(&pdev
->dev
, pdevinfo
->acpi_node
.handle
);
436 if (pdevinfo
->dma_mask
) {
438 * This memory isn't freed when the device is put,
439 * I don't have a nice idea for that though. Conceptually
440 * dma_mask in struct device should not be a pointer.
441 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
444 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
445 if (!pdev
->dev
.dma_mask
)
448 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
449 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
452 ret
= platform_device_add_resources(pdev
,
453 pdevinfo
->res
, pdevinfo
->num_res
);
457 ret
= platform_device_add_data(pdev
,
458 pdevinfo
->data
, pdevinfo
->size_data
);
462 ret
= platform_device_add(pdev
);
465 ACPI_HANDLE_SET(&pdev
->dev
, NULL
);
466 kfree(pdev
->dev
.dma_mask
);
469 platform_device_put(pdev
);
475 EXPORT_SYMBOL_GPL(platform_device_register_full
);
477 static int platform_drv_probe(struct device
*_dev
)
479 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
480 struct platform_device
*dev
= to_platform_device(_dev
);
483 if (ACPI_HANDLE(_dev
))
484 acpi_dev_pm_attach(_dev
, true);
486 ret
= drv
->probe(dev
);
487 if (ret
&& ACPI_HANDLE(_dev
))
488 acpi_dev_pm_detach(_dev
, true);
493 static int platform_drv_probe_fail(struct device
*_dev
)
498 static int platform_drv_remove(struct device
*_dev
)
500 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
501 struct platform_device
*dev
= to_platform_device(_dev
);
504 ret
= drv
->remove(dev
);
505 if (ACPI_HANDLE(_dev
))
506 acpi_dev_pm_detach(_dev
, true);
511 static void platform_drv_shutdown(struct device
*_dev
)
513 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
514 struct platform_device
*dev
= to_platform_device(_dev
);
517 if (ACPI_HANDLE(_dev
))
518 acpi_dev_pm_detach(_dev
, true);
522 * platform_driver_register - register a driver for platform-level devices
523 * @drv: platform driver structure
525 int platform_driver_register(struct platform_driver
*drv
)
527 drv
->driver
.bus
= &platform_bus_type
;
529 drv
->driver
.probe
= platform_drv_probe
;
531 drv
->driver
.remove
= platform_drv_remove
;
533 drv
->driver
.shutdown
= platform_drv_shutdown
;
535 return driver_register(&drv
->driver
);
537 EXPORT_SYMBOL_GPL(platform_driver_register
);
540 * platform_driver_unregister - unregister a driver for platform-level devices
541 * @drv: platform driver structure
543 void platform_driver_unregister(struct platform_driver
*drv
)
545 driver_unregister(&drv
->driver
);
547 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
550 * platform_driver_probe - register driver for non-hotpluggable device
551 * @drv: platform driver structure
552 * @probe: the driver probe routine, probably from an __init section,
553 * must not return -EPROBE_DEFER.
555 * Use this instead of platform_driver_register() when you know the device
556 * is not hotpluggable and has already been registered, and you want to
557 * remove its run-once probe() infrastructure from memory after the driver
558 * has bound to the device.
560 * One typical use for this would be with drivers for controllers integrated
561 * into system-on-chip processors, where the controller devices have been
562 * configured as part of board setup.
564 * This is incompatible with deferred probing so probe() must not
565 * return -EPROBE_DEFER.
567 * Returns zero if the driver registered and bound to a device, else returns
568 * a negative error code and with the driver not registered.
570 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
571 int (*probe
)(struct platform_device
*))
575 /* make sure driver won't have bind/unbind attributes */
576 drv
->driver
.suppress_bind_attrs
= true;
578 /* temporary section violation during probe() */
580 retval
= code
= platform_driver_register(drv
);
583 * Fixup that section violation, being paranoid about code scanning
584 * the list of drivers in order to probe new devices. Check to see
585 * if the probe was successful, and make sure any forced probes of
588 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
590 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
592 drv
->driver
.probe
= platform_drv_probe_fail
;
593 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
596 platform_driver_unregister(drv
);
599 EXPORT_SYMBOL_GPL(platform_driver_probe
);
602 * platform_create_bundle - register driver and create corresponding device
603 * @driver: platform driver structure
604 * @probe: the driver probe routine, probably from an __init section
605 * @res: set of resources that needs to be allocated for the device
606 * @n_res: number of resources
607 * @data: platform specific data for this platform device
608 * @size: size of platform specific data
610 * Use this in legacy-style modules that probe hardware directly and
611 * register a single platform device and corresponding platform driver.
613 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
615 struct platform_device
* __init_or_module
platform_create_bundle(
616 struct platform_driver
*driver
,
617 int (*probe
)(struct platform_device
*),
618 struct resource
*res
, unsigned int n_res
,
619 const void *data
, size_t size
)
621 struct platform_device
*pdev
;
624 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
630 error
= platform_device_add_resources(pdev
, res
, n_res
);
634 error
= platform_device_add_data(pdev
, data
, size
);
638 error
= platform_device_add(pdev
);
642 error
= platform_driver_probe(driver
, probe
);
649 platform_device_del(pdev
);
651 platform_device_put(pdev
);
653 return ERR_PTR(error
);
655 EXPORT_SYMBOL_GPL(platform_create_bundle
);
657 /* modalias support enables more hands-off userspace setup:
658 * (a) environment variable lets new-style hotplug events work once system is
659 * fully running: "modprobe $MODALIAS"
660 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
661 * mishandled before system is fully running: "modprobe $(cat modalias)"
663 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
666 struct platform_device
*pdev
= to_platform_device(dev
);
667 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
669 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
672 static struct device_attribute platform_dev_attrs
[] = {
677 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
679 struct platform_device
*pdev
= to_platform_device(dev
);
682 /* Some devices have extra OF data and an OF-style MODALIAS */
683 rc
= of_device_uevent_modalias(dev
, env
);
687 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
692 static const struct platform_device_id
*platform_match_id(
693 const struct platform_device_id
*id
,
694 struct platform_device
*pdev
)
696 while (id
->name
[0]) {
697 if (strcmp(pdev
->name
, id
->name
) == 0) {
707 * platform_match - bind platform device to platform driver.
711 * Platform device IDs are assumed to be encoded like this:
712 * "<name><instance>", where <name> is a short description of the type of
713 * device, like "pci" or "floppy", and <instance> is the enumerated
714 * instance of the device, like '0' or '42'. Driver IDs are simply
715 * "<name>". So, extract the <name> from the platform_device structure,
716 * and compare it against the name of the driver. Return whether they match
719 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
721 struct platform_device
*pdev
= to_platform_device(dev
);
722 struct platform_driver
*pdrv
= to_platform_driver(drv
);
724 /* Attempt an OF style match first */
725 if (of_driver_match_device(dev
, drv
))
728 /* Then try ACPI style match */
729 if (acpi_driver_match_device(dev
, drv
))
732 /* Then try to match against the id table */
734 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
736 /* fall-back to driver name match */
737 return (strcmp(pdev
->name
, drv
->name
) == 0);
740 #ifdef CONFIG_PM_SLEEP
742 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
744 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
745 struct platform_device
*pdev
= to_platform_device(dev
);
748 if (dev
->driver
&& pdrv
->suspend
)
749 ret
= pdrv
->suspend(pdev
, mesg
);
754 static int platform_legacy_resume(struct device
*dev
)
756 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
757 struct platform_device
*pdev
= to_platform_device(dev
);
760 if (dev
->driver
&& pdrv
->resume
)
761 ret
= pdrv
->resume(pdev
);
766 #endif /* CONFIG_PM_SLEEP */
768 #ifdef CONFIG_SUSPEND
770 int platform_pm_suspend(struct device
*dev
)
772 struct device_driver
*drv
= dev
->driver
;
779 if (drv
->pm
->suspend
)
780 ret
= drv
->pm
->suspend(dev
);
782 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
788 int platform_pm_resume(struct device
*dev
)
790 struct device_driver
*drv
= dev
->driver
;
798 ret
= drv
->pm
->resume(dev
);
800 ret
= platform_legacy_resume(dev
);
806 #endif /* CONFIG_SUSPEND */
808 #ifdef CONFIG_HIBERNATE_CALLBACKS
810 int platform_pm_freeze(struct device
*dev
)
812 struct device_driver
*drv
= dev
->driver
;
820 ret
= drv
->pm
->freeze(dev
);
822 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
828 int platform_pm_thaw(struct device
*dev
)
830 struct device_driver
*drv
= dev
->driver
;
838 ret
= drv
->pm
->thaw(dev
);
840 ret
= platform_legacy_resume(dev
);
846 int platform_pm_poweroff(struct device
*dev
)
848 struct device_driver
*drv
= dev
->driver
;
855 if (drv
->pm
->poweroff
)
856 ret
= drv
->pm
->poweroff(dev
);
858 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
864 int platform_pm_restore(struct device
*dev
)
866 struct device_driver
*drv
= dev
->driver
;
873 if (drv
->pm
->restore
)
874 ret
= drv
->pm
->restore(dev
);
876 ret
= platform_legacy_resume(dev
);
882 #endif /* CONFIG_HIBERNATE_CALLBACKS */
884 static const struct dev_pm_ops platform_dev_pm_ops
= {
885 .runtime_suspend
= pm_generic_runtime_suspend
,
886 .runtime_resume
= pm_generic_runtime_resume
,
887 .runtime_idle
= pm_generic_runtime_idle
,
888 USE_PLATFORM_PM_SLEEP_OPS
891 struct bus_type platform_bus_type
= {
893 .dev_attrs
= platform_dev_attrs
,
894 .match
= platform_match
,
895 .uevent
= platform_uevent
,
896 .pm
= &platform_dev_pm_ops
,
898 EXPORT_SYMBOL_GPL(platform_bus_type
);
900 int __init
platform_bus_init(void)
904 early_platform_cleanup();
906 error
= device_register(&platform_bus
);
909 error
= bus_register(&platform_bus_type
);
911 device_unregister(&platform_bus
);
915 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
916 u64
dma_get_required_mask(struct device
*dev
)
918 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
919 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
922 if (!high_totalram
) {
923 /* convert to mask just covering totalram */
924 low_totalram
= (1 << (fls(low_totalram
) - 1));
925 low_totalram
+= low_totalram
- 1;
928 high_totalram
= (1 << (fls(high_totalram
) - 1));
929 high_totalram
+= high_totalram
- 1;
930 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
934 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
937 static __initdata
LIST_HEAD(early_platform_driver_list
);
938 static __initdata
LIST_HEAD(early_platform_device_list
);
941 * early_platform_driver_register - register early platform driver
942 * @epdrv: early_platform driver structure
943 * @buf: string passed from early_param()
945 * Helper function for early_platform_init() / early_platform_init_buffer()
947 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
953 /* Simply add the driver to the end of the global list.
954 * Drivers will by default be put on the list in compiled-in order.
956 if (!epdrv
->list
.next
) {
957 INIT_LIST_HEAD(&epdrv
->list
);
958 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
961 /* If the user has specified device then make sure the driver
962 * gets prioritized. The driver of the last device specified on
963 * command line will be put first on the list.
965 n
= strlen(epdrv
->pdrv
->driver
.name
);
966 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
967 list_move(&epdrv
->list
, &early_platform_driver_list
);
969 /* Allow passing parameters after device name */
970 if (buf
[n
] == '\0' || buf
[n
] == ',')
971 epdrv
->requested_id
= -1;
973 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
976 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
977 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
980 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
986 if (epdrv
->bufsize
) {
987 memcpy(epdrv
->buffer
, &buf
[n
],
988 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
989 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
997 * early_platform_add_devices - adds a number of early platform devices
998 * @devs: array of early platform devices to add
999 * @num: number of early platform devices in array
1001 * Used by early architecture code to register early platform devices and
1002 * their platform data.
1004 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1009 /* simply add the devices to list */
1010 for (i
= 0; i
< num
; i
++) {
1011 dev
= &devs
[i
]->dev
;
1013 if (!dev
->devres_head
.next
) {
1014 pm_runtime_early_init(dev
);
1015 INIT_LIST_HEAD(&dev
->devres_head
);
1016 list_add_tail(&dev
->devres_head
,
1017 &early_platform_device_list
);
1023 * early_platform_driver_register_all - register early platform drivers
1024 * @class_str: string to identify early platform driver class
1026 * Used by architecture code to register all early platform drivers
1027 * for a certain class. If omitted then only early platform drivers
1028 * with matching kernel command line class parameters will be registered.
1030 void __init
early_platform_driver_register_all(char *class_str
)
1032 /* The "class_str" parameter may or may not be present on the kernel
1033 * command line. If it is present then there may be more than one
1034 * matching parameter.
1036 * Since we register our early platform drivers using early_param()
1037 * we need to make sure that they also get registered in the case
1038 * when the parameter is missing from the kernel command line.
1040 * We use parse_early_options() to make sure the early_param() gets
1041 * called at least once. The early_param() may be called more than
1042 * once since the name of the preferred device may be specified on
1043 * the kernel command line. early_platform_driver_register() handles
1046 parse_early_options(class_str
);
1050 * early_platform_match - find early platform device matching driver
1051 * @epdrv: early platform driver structure
1052 * @id: id to match against
1054 static __init
struct platform_device
*
1055 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1057 struct platform_device
*pd
;
1059 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1060 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1068 * early_platform_left - check if early platform driver has matching devices
1069 * @epdrv: early platform driver structure
1070 * @id: return true if id or above exists
1072 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1075 struct platform_device
*pd
;
1077 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1078 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1086 * early_platform_driver_probe_id - probe drivers matching class_str and id
1087 * @class_str: string to identify early platform driver class
1088 * @id: id to match against
1089 * @nr_probe: number of platform devices to successfully probe before exiting
1091 static int __init
early_platform_driver_probe_id(char *class_str
,
1095 struct early_platform_driver
*epdrv
;
1096 struct platform_device
*match
;
1101 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1102 /* only use drivers matching our class_str */
1103 if (strcmp(class_str
, epdrv
->class_str
))
1107 match_id
= epdrv
->requested_id
;
1112 left
+= early_platform_left(epdrv
, id
);
1114 /* skip requested id */
1115 switch (epdrv
->requested_id
) {
1116 case EARLY_PLATFORM_ID_ERROR
:
1117 case EARLY_PLATFORM_ID_UNSET
:
1120 if (epdrv
->requested_id
== id
)
1121 match_id
= EARLY_PLATFORM_ID_UNSET
;
1126 case EARLY_PLATFORM_ID_ERROR
:
1127 pr_warn("%s: unable to parse %s parameter\n",
1128 class_str
, epdrv
->pdrv
->driver
.name
);
1130 case EARLY_PLATFORM_ID_UNSET
:
1134 match
= early_platform_match(epdrv
, match_id
);
1139 * Set up a sensible init_name to enable
1140 * dev_name() and others to be used before the
1141 * rest of the driver core is initialized.
1143 if (!match
->dev
.init_name
&& slab_is_available()) {
1144 if (match
->id
!= -1)
1145 match
->dev
.init_name
=
1146 kasprintf(GFP_KERNEL
, "%s.%d",
1150 match
->dev
.init_name
=
1151 kasprintf(GFP_KERNEL
, "%s",
1154 if (!match
->dev
.init_name
)
1158 if (epdrv
->pdrv
->probe(match
))
1159 pr_warn("%s: unable to probe %s early.\n",
1160 class_str
, match
->name
);
1176 * early_platform_driver_probe - probe a class of registered drivers
1177 * @class_str: string to identify early platform driver class
1178 * @nr_probe: number of platform devices to successfully probe before exiting
1179 * @user_only: only probe user specified early platform devices
1181 * Used by architecture code to probe registered early platform drivers
1182 * within a certain class. For probe to happen a registered early platform
1183 * device matching a registered early platform driver is needed.
1185 int __init
early_platform_driver_probe(char *class_str
,
1192 for (i
= -2; n
< nr_probe
; i
++) {
1193 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1208 * early_platform_cleanup - clean up early platform code
1210 void __init
early_platform_cleanup(void)
1212 struct platform_device
*pd
, *pd2
;
1214 /* clean up the devres list used to chain devices */
1215 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1217 list_del(&pd
->dev
.devres_head
);
1218 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));