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>
26 #include "power/power.h"
28 /* For automatically allocated device IDs */
29 static DEFINE_IDA(platform_devid_ida
);
31 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
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_devic_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
)
86 struct resource
*r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
88 return r
? r
->start
: -ENXIO
;
90 EXPORT_SYMBOL_GPL(platform_get_irq
);
93 * platform_get_resource_byname - get a resource for a device by name
94 * @dev: platform device
95 * @type: resource type
96 * @name: resource name
98 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
104 for (i
= 0; i
< dev
->num_resources
; i
++) {
105 struct resource
*r
= &dev
->resource
[i
];
107 if (unlikely(!r
->name
))
110 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
115 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
118 * platform_get_irq - get an IRQ for a device
119 * @dev: platform device
122 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
124 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
,
127 return r
? r
->start
: -ENXIO
;
129 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
132 * platform_add_devices - add a numbers of platform devices
133 * @devs: array of platform devices to add
134 * @num: number of platform devices in array
136 int platform_add_devices(struct platform_device
**devs
, int num
)
140 for (i
= 0; i
< num
; i
++) {
141 ret
= platform_device_register(devs
[i
]);
144 platform_device_unregister(devs
[i
]);
151 EXPORT_SYMBOL_GPL(platform_add_devices
);
153 struct platform_object
{
154 struct platform_device pdev
;
159 * platform_device_put - destroy a platform device
160 * @pdev: platform device to free
162 * Free all memory associated with a platform device. This function must
163 * _only_ be externally called in error cases. All other usage is a bug.
165 void platform_device_put(struct platform_device
*pdev
)
168 put_device(&pdev
->dev
);
170 EXPORT_SYMBOL_GPL(platform_device_put
);
172 static void platform_device_release(struct device
*dev
)
174 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
177 of_device_node_put(&pa
->pdev
.dev
);
178 kfree(pa
->pdev
.dev
.platform_data
);
179 kfree(pa
->pdev
.mfd_cell
);
180 kfree(pa
->pdev
.resource
);
185 * platform_device_alloc - create a platform device
186 * @name: base name of the device we're adding
189 * Create a platform device object which can have other objects attached
190 * to it, and which will have attached objects freed when it is released.
192 struct platform_device
*platform_device_alloc(const char *name
, int id
)
194 struct platform_object
*pa
;
196 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
198 strcpy(pa
->name
, name
);
199 pa
->pdev
.name
= pa
->name
;
201 device_initialize(&pa
->pdev
.dev
);
202 pa
->pdev
.dev
.release
= platform_device_release
;
203 arch_setup_pdev_archdata(&pa
->pdev
);
206 return pa
? &pa
->pdev
: NULL
;
208 EXPORT_SYMBOL_GPL(platform_device_alloc
);
211 * platform_device_add_resources - add resources to a platform device
212 * @pdev: platform device allocated by platform_device_alloc to add resources to
213 * @res: set of resources that needs to be allocated for the device
214 * @num: number of resources
216 * Add a copy of the resources to the platform device. The memory
217 * associated with the resources will be freed when the platform device is
220 int platform_device_add_resources(struct platform_device
*pdev
,
221 const struct resource
*res
, unsigned int num
)
223 struct resource
*r
= NULL
;
226 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
231 kfree(pdev
->resource
);
233 pdev
->num_resources
= num
;
236 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
239 * platform_device_add_data - add platform-specific data to a platform device
240 * @pdev: platform device allocated by platform_device_alloc to add resources to
241 * @data: platform specific data for this platform device
242 * @size: size of platform specific data
244 * Add a copy of platform specific data to the platform device's
245 * platform_data pointer. The memory associated with the platform data
246 * will be freed when the platform device is released.
248 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
254 d
= kmemdup(data
, size
, GFP_KERNEL
);
259 kfree(pdev
->dev
.platform_data
);
260 pdev
->dev
.platform_data
= d
;
263 EXPORT_SYMBOL_GPL(platform_device_add_data
);
266 * platform_device_add - add a platform device to device hierarchy
267 * @pdev: platform device we're adding
269 * This is part 2 of platform_device_register(), though may be called
270 * separately _iff_ pdev was allocated by platform_device_alloc().
272 int platform_device_add(struct platform_device
*pdev
)
279 if (!pdev
->dev
.parent
)
280 pdev
->dev
.parent
= &platform_bus
;
282 pdev
->dev
.bus
= &platform_bus_type
;
286 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
288 case PLATFORM_DEVID_NONE
:
289 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
291 case PLATFORM_DEVID_AUTO
:
293 * Automatically allocated device ID. We mark it as such so
294 * that we remember it must be freed, and we append a suffix
295 * to avoid namespace collision with explicit IDs.
297 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
301 pdev
->id_auto
= true;
302 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
306 for (i
= 0; i
< pdev
->num_resources
; i
++) {
307 struct resource
*p
, *r
= &pdev
->resource
[i
];
310 r
->name
= dev_name(&pdev
->dev
);
314 if (resource_type(r
) == IORESOURCE_MEM
)
316 else if (resource_type(r
) == IORESOURCE_IO
)
317 p
= &ioport_resource
;
320 if (p
&& insert_resource(p
, r
)) {
322 "%s: failed to claim resource %d\n",
323 dev_name(&pdev
->dev
), i
);
329 pr_debug("Registering platform device '%s'. Parent at %s\n",
330 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
332 ret
= device_add(&pdev
->dev
);
338 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
339 pdev
->id
= PLATFORM_DEVID_AUTO
;
343 struct resource
*r
= &pdev
->resource
[i
];
344 unsigned long type
= resource_type(r
);
346 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
353 EXPORT_SYMBOL_GPL(platform_device_add
);
356 * platform_device_del - remove a platform-level device
357 * @pdev: platform device we're removing
359 * Note that this function will also release all memory- and port-based
360 * resources owned by the device (@dev->resource). This function must
361 * _only_ be externally called in error cases. All other usage is a bug.
363 void platform_device_del(struct platform_device
*pdev
)
368 device_del(&pdev
->dev
);
371 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
372 pdev
->id
= PLATFORM_DEVID_AUTO
;
375 for (i
= 0; i
< pdev
->num_resources
; i
++) {
376 struct resource
*r
= &pdev
->resource
[i
];
377 unsigned long type
= resource_type(r
);
379 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
384 EXPORT_SYMBOL_GPL(platform_device_del
);
387 * platform_device_register - add a platform-level device
388 * @pdev: platform device we're adding
390 int platform_device_register(struct platform_device
*pdev
)
392 device_initialize(&pdev
->dev
);
393 arch_setup_pdev_archdata(pdev
);
394 return platform_device_add(pdev
);
396 EXPORT_SYMBOL_GPL(platform_device_register
);
399 * platform_device_unregister - unregister a platform-level device
400 * @pdev: platform device we're unregistering
402 * Unregistration is done in 2 steps. First we release all resources
403 * and remove it from the subsystem, then we drop reference count by
404 * calling platform_device_put().
406 void platform_device_unregister(struct platform_device
*pdev
)
408 platform_device_del(pdev
);
409 platform_device_put(pdev
);
411 EXPORT_SYMBOL_GPL(platform_device_unregister
);
414 * platform_device_register_full - add a platform-level device with
415 * resources and platform-specific data
417 * @pdevinfo: data used to create device
419 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
421 struct platform_device
*platform_device_register_full(
422 const struct platform_device_info
*pdevinfo
)
425 struct platform_device
*pdev
;
427 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
431 pdev
->dev
.parent
= pdevinfo
->parent
;
433 if (pdevinfo
->dma_mask
) {
435 * This memory isn't freed when the device is put,
436 * I don't have a nice idea for that though. Conceptually
437 * dma_mask in struct device should not be a pointer.
438 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
441 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
442 if (!pdev
->dev
.dma_mask
)
445 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
446 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
449 ret
= platform_device_add_resources(pdev
,
450 pdevinfo
->res
, pdevinfo
->num_res
);
454 ret
= platform_device_add_data(pdev
,
455 pdevinfo
->data
, pdevinfo
->size_data
);
459 ret
= platform_device_add(pdev
);
462 kfree(pdev
->dev
.dma_mask
);
465 platform_device_put(pdev
);
471 EXPORT_SYMBOL_GPL(platform_device_register_full
);
473 static int platform_drv_probe(struct device
*_dev
)
475 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
476 struct platform_device
*dev
= to_platform_device(_dev
);
478 return drv
->probe(dev
);
481 static int platform_drv_probe_fail(struct device
*_dev
)
486 static int platform_drv_remove(struct device
*_dev
)
488 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
489 struct platform_device
*dev
= to_platform_device(_dev
);
491 return drv
->remove(dev
);
494 static void platform_drv_shutdown(struct device
*_dev
)
496 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
497 struct platform_device
*dev
= to_platform_device(_dev
);
503 * platform_driver_register - register a driver for platform-level devices
504 * @drv: platform driver structure
506 int platform_driver_register(struct platform_driver
*drv
)
508 drv
->driver
.bus
= &platform_bus_type
;
510 drv
->driver
.probe
= platform_drv_probe
;
512 drv
->driver
.remove
= platform_drv_remove
;
514 drv
->driver
.shutdown
= platform_drv_shutdown
;
516 return driver_register(&drv
->driver
);
518 EXPORT_SYMBOL_GPL(platform_driver_register
);
521 * platform_driver_unregister - unregister a driver for platform-level devices
522 * @drv: platform driver structure
524 void platform_driver_unregister(struct platform_driver
*drv
)
526 driver_unregister(&drv
->driver
);
528 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
531 * platform_driver_probe - register driver for non-hotpluggable device
532 * @drv: platform driver structure
533 * @probe: the driver probe routine, probably from an __init section
535 * Use this instead of platform_driver_register() when you know the device
536 * is not hotpluggable and has already been registered, and you want to
537 * remove its run-once probe() infrastructure from memory after the driver
538 * has bound to the device.
540 * One typical use for this would be with drivers for controllers integrated
541 * into system-on-chip processors, where the controller devices have been
542 * configured as part of board setup.
544 * Returns zero if the driver registered and bound to a device, else returns
545 * a negative error code and with the driver not registered.
547 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
548 int (*probe
)(struct platform_device
*))
552 /* make sure driver won't have bind/unbind attributes */
553 drv
->driver
.suppress_bind_attrs
= true;
555 /* temporary section violation during probe() */
557 retval
= code
= platform_driver_register(drv
);
560 * Fixup that section violation, being paranoid about code scanning
561 * the list of drivers in order to probe new devices. Check to see
562 * if the probe was successful, and make sure any forced probes of
565 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
567 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
569 drv
->driver
.probe
= platform_drv_probe_fail
;
570 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
573 platform_driver_unregister(drv
);
576 EXPORT_SYMBOL_GPL(platform_driver_probe
);
579 * platform_create_bundle - register driver and create corresponding device
580 * @driver: platform driver structure
581 * @probe: the driver probe routine, probably from an __init section
582 * @res: set of resources that needs to be allocated for the device
583 * @n_res: number of resources
584 * @data: platform specific data for this platform device
585 * @size: size of platform specific data
587 * Use this in legacy-style modules that probe hardware directly and
588 * register a single platform device and corresponding platform driver.
590 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
592 struct platform_device
* __init_or_module
platform_create_bundle(
593 struct platform_driver
*driver
,
594 int (*probe
)(struct platform_device
*),
595 struct resource
*res
, unsigned int n_res
,
596 const void *data
, size_t size
)
598 struct platform_device
*pdev
;
601 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
607 error
= platform_device_add_resources(pdev
, res
, n_res
);
611 error
= platform_device_add_data(pdev
, data
, size
);
615 error
= platform_device_add(pdev
);
619 error
= platform_driver_probe(driver
, probe
);
626 platform_device_del(pdev
);
628 platform_device_put(pdev
);
630 return ERR_PTR(error
);
632 EXPORT_SYMBOL_GPL(platform_create_bundle
);
634 /* modalias support enables more hands-off userspace setup:
635 * (a) environment variable lets new-style hotplug events work once system is
636 * fully running: "modprobe $MODALIAS"
637 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
638 * mishandled before system is fully running: "modprobe $(cat modalias)"
640 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
643 struct platform_device
*pdev
= to_platform_device(dev
);
644 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
646 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
649 static struct device_attribute platform_dev_attrs
[] = {
654 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
656 struct platform_device
*pdev
= to_platform_device(dev
);
659 /* Some devices have extra OF data and an OF-style MODALIAS */
660 rc
= of_device_uevent_modalias(dev
,env
);
664 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
669 static const struct platform_device_id
*platform_match_id(
670 const struct platform_device_id
*id
,
671 struct platform_device
*pdev
)
673 while (id
->name
[0]) {
674 if (strcmp(pdev
->name
, id
->name
) == 0) {
684 * platform_match - bind platform device to platform driver.
688 * Platform device IDs are assumed to be encoded like this:
689 * "<name><instance>", where <name> is a short description of the type of
690 * device, like "pci" or "floppy", and <instance> is the enumerated
691 * instance of the device, like '0' or '42'. Driver IDs are simply
692 * "<name>". So, extract the <name> from the platform_device structure,
693 * and compare it against the name of the driver. Return whether they match
696 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
698 struct platform_device
*pdev
= to_platform_device(dev
);
699 struct platform_driver
*pdrv
= to_platform_driver(drv
);
701 /* Attempt an OF style match first */
702 if (of_driver_match_device(dev
, drv
))
705 /* Then try to match against the id table */
707 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
709 /* fall-back to driver name match */
710 return (strcmp(pdev
->name
, drv
->name
) == 0);
713 #ifdef CONFIG_PM_SLEEP
715 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
717 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
718 struct platform_device
*pdev
= to_platform_device(dev
);
721 if (dev
->driver
&& pdrv
->suspend
)
722 ret
= pdrv
->suspend(pdev
, mesg
);
727 static int platform_legacy_resume(struct device
*dev
)
729 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
730 struct platform_device
*pdev
= to_platform_device(dev
);
733 if (dev
->driver
&& pdrv
->resume
)
734 ret
= pdrv
->resume(pdev
);
739 #endif /* CONFIG_PM_SLEEP */
741 #ifdef CONFIG_SUSPEND
743 int platform_pm_suspend(struct device
*dev
)
745 struct device_driver
*drv
= dev
->driver
;
752 if (drv
->pm
->suspend
)
753 ret
= drv
->pm
->suspend(dev
);
755 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
761 int platform_pm_resume(struct device
*dev
)
763 struct device_driver
*drv
= dev
->driver
;
771 ret
= drv
->pm
->resume(dev
);
773 ret
= platform_legacy_resume(dev
);
779 #endif /* CONFIG_SUSPEND */
781 #ifdef CONFIG_HIBERNATE_CALLBACKS
783 int platform_pm_freeze(struct device
*dev
)
785 struct device_driver
*drv
= dev
->driver
;
793 ret
= drv
->pm
->freeze(dev
);
795 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
801 int platform_pm_thaw(struct device
*dev
)
803 struct device_driver
*drv
= dev
->driver
;
811 ret
= drv
->pm
->thaw(dev
);
813 ret
= platform_legacy_resume(dev
);
819 int platform_pm_poweroff(struct device
*dev
)
821 struct device_driver
*drv
= dev
->driver
;
828 if (drv
->pm
->poweroff
)
829 ret
= drv
->pm
->poweroff(dev
);
831 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
837 int platform_pm_restore(struct device
*dev
)
839 struct device_driver
*drv
= dev
->driver
;
846 if (drv
->pm
->restore
)
847 ret
= drv
->pm
->restore(dev
);
849 ret
= platform_legacy_resume(dev
);
855 #endif /* CONFIG_HIBERNATE_CALLBACKS */
857 static const struct dev_pm_ops platform_dev_pm_ops
= {
858 .runtime_suspend
= pm_generic_runtime_suspend
,
859 .runtime_resume
= pm_generic_runtime_resume
,
860 .runtime_idle
= pm_generic_runtime_idle
,
861 USE_PLATFORM_PM_SLEEP_OPS
864 struct bus_type platform_bus_type
= {
866 .dev_attrs
= platform_dev_attrs
,
867 .match
= platform_match
,
868 .uevent
= platform_uevent
,
869 .pm
= &platform_dev_pm_ops
,
871 EXPORT_SYMBOL_GPL(platform_bus_type
);
873 int __init
platform_bus_init(void)
877 early_platform_cleanup();
879 error
= device_register(&platform_bus
);
882 error
= bus_register(&platform_bus_type
);
884 device_unregister(&platform_bus
);
888 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
889 u64
dma_get_required_mask(struct device
*dev
)
891 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
892 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
895 if (!high_totalram
) {
896 /* convert to mask just covering totalram */
897 low_totalram
= (1 << (fls(low_totalram
) - 1));
898 low_totalram
+= low_totalram
- 1;
901 high_totalram
= (1 << (fls(high_totalram
) - 1));
902 high_totalram
+= high_totalram
- 1;
903 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
907 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
910 static __initdata
LIST_HEAD(early_platform_driver_list
);
911 static __initdata
LIST_HEAD(early_platform_device_list
);
914 * early_platform_driver_register - register early platform driver
915 * @epdrv: early_platform driver structure
916 * @buf: string passed from early_param()
918 * Helper function for early_platform_init() / early_platform_init_buffer()
920 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
926 /* Simply add the driver to the end of the global list.
927 * Drivers will by default be put on the list in compiled-in order.
929 if (!epdrv
->list
.next
) {
930 INIT_LIST_HEAD(&epdrv
->list
);
931 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
934 /* If the user has specified device then make sure the driver
935 * gets prioritized. The driver of the last device specified on
936 * command line will be put first on the list.
938 n
= strlen(epdrv
->pdrv
->driver
.name
);
939 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
940 list_move(&epdrv
->list
, &early_platform_driver_list
);
942 /* Allow passing parameters after device name */
943 if (buf
[n
] == '\0' || buf
[n
] == ',')
944 epdrv
->requested_id
= -1;
946 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
949 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
950 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
953 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
959 if (epdrv
->bufsize
) {
960 memcpy(epdrv
->buffer
, &buf
[n
],
961 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
962 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
970 * early_platform_add_devices - adds a number of early platform devices
971 * @devs: array of early platform devices to add
972 * @num: number of early platform devices in array
974 * Used by early architecture code to register early platform devices and
975 * their platform data.
977 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
982 /* simply add the devices to list */
983 for (i
= 0; i
< num
; i
++) {
986 if (!dev
->devres_head
.next
) {
987 pm_runtime_early_init(dev
);
988 INIT_LIST_HEAD(&dev
->devres_head
);
989 list_add_tail(&dev
->devres_head
,
990 &early_platform_device_list
);
996 * early_platform_driver_register_all - register early platform drivers
997 * @class_str: string to identify early platform driver class
999 * Used by architecture code to register all early platform drivers
1000 * for a certain class. If omitted then only early platform drivers
1001 * with matching kernel command line class parameters will be registered.
1003 void __init
early_platform_driver_register_all(char *class_str
)
1005 /* The "class_str" parameter may or may not be present on the kernel
1006 * command line. If it is present then there may be more than one
1007 * matching parameter.
1009 * Since we register our early platform drivers using early_param()
1010 * we need to make sure that they also get registered in the case
1011 * when the parameter is missing from the kernel command line.
1013 * We use parse_early_options() to make sure the early_param() gets
1014 * called at least once. The early_param() may be called more than
1015 * once since the name of the preferred device may be specified on
1016 * the kernel command line. early_platform_driver_register() handles
1019 parse_early_options(class_str
);
1023 * early_platform_match - find early platform device matching driver
1024 * @epdrv: early platform driver structure
1025 * @id: id to match against
1027 static __init
struct platform_device
*
1028 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1030 struct platform_device
*pd
;
1032 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1033 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1041 * early_platform_left - check if early platform driver has matching devices
1042 * @epdrv: early platform driver structure
1043 * @id: return true if id or above exists
1045 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1048 struct platform_device
*pd
;
1050 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1051 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1059 * early_platform_driver_probe_id - probe drivers matching class_str and id
1060 * @class_str: string to identify early platform driver class
1061 * @id: id to match against
1062 * @nr_probe: number of platform devices to successfully probe before exiting
1064 static int __init
early_platform_driver_probe_id(char *class_str
,
1068 struct early_platform_driver
*epdrv
;
1069 struct platform_device
*match
;
1074 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1075 /* only use drivers matching our class_str */
1076 if (strcmp(class_str
, epdrv
->class_str
))
1080 match_id
= epdrv
->requested_id
;
1085 left
+= early_platform_left(epdrv
, id
);
1087 /* skip requested id */
1088 switch (epdrv
->requested_id
) {
1089 case EARLY_PLATFORM_ID_ERROR
:
1090 case EARLY_PLATFORM_ID_UNSET
:
1093 if (epdrv
->requested_id
== id
)
1094 match_id
= EARLY_PLATFORM_ID_UNSET
;
1099 case EARLY_PLATFORM_ID_ERROR
:
1100 pr_warning("%s: unable to parse %s parameter\n",
1101 class_str
, epdrv
->pdrv
->driver
.name
);
1103 case EARLY_PLATFORM_ID_UNSET
:
1107 match
= early_platform_match(epdrv
, match_id
);
1112 * Set up a sensible init_name to enable
1113 * dev_name() and others to be used before the
1114 * rest of the driver core is initialized.
1116 if (!match
->dev
.init_name
&& slab_is_available()) {
1117 if (match
->id
!= -1)
1118 match
->dev
.init_name
=
1119 kasprintf(GFP_KERNEL
, "%s.%d",
1123 match
->dev
.init_name
=
1124 kasprintf(GFP_KERNEL
, "%s",
1127 if (!match
->dev
.init_name
)
1131 if (epdrv
->pdrv
->probe(match
))
1132 pr_warning("%s: unable to probe %s early.\n",
1133 class_str
, match
->name
);
1149 * early_platform_driver_probe - probe a class of registered drivers
1150 * @class_str: string to identify early platform driver class
1151 * @nr_probe: number of platform devices to successfully probe before exiting
1152 * @user_only: only probe user specified early platform devices
1154 * Used by architecture code to probe registered early platform drivers
1155 * within a certain class. For probe to happen a registered early platform
1156 * device matching a registered early platform driver is needed.
1158 int __init
early_platform_driver_probe(char *class_str
,
1165 for (i
= -2; n
< nr_probe
; i
++) {
1166 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1181 * early_platform_cleanup - clean up early platform code
1183 void __init
early_platform_cleanup(void)
1185 struct platform_device
*pd
, *pd2
;
1187 /* clean up the devres list used to chain devices */
1188 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1190 list_del(&pd
->dev
.devres_head
);
1191 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));