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/platform_device.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/bootmem.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
23 #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
26 struct device platform_bus
= {
27 .init_name
= "platform",
29 EXPORT_SYMBOL_GPL(platform_bus
);
32 * platform_get_resource - get a resource for a device
33 * @dev: platform device
34 * @type: resource type
35 * @num: resource index
37 struct resource
*platform_get_resource(struct platform_device
*dev
,
38 unsigned int type
, unsigned int num
)
42 for (i
= 0; i
< dev
->num_resources
; i
++) {
43 struct resource
*r
= &dev
->resource
[i
];
45 if (type
== resource_type(r
) && num
-- == 0)
50 EXPORT_SYMBOL_GPL(platform_get_resource
);
53 * platform_get_irq - get an IRQ for a device
54 * @dev: platform device
55 * @num: IRQ number index
57 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
59 struct resource
*r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
61 return r
? r
->start
: -ENXIO
;
63 EXPORT_SYMBOL_GPL(platform_get_irq
);
66 * platform_get_resource_byname - get a resource for a device by name
67 * @dev: platform device
68 * @type: resource type
69 * @name: resource name
71 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
72 unsigned int type
, char *name
)
76 for (i
= 0; i
< dev
->num_resources
; i
++) {
77 struct resource
*r
= &dev
->resource
[i
];
79 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
84 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
87 * platform_get_irq - get an IRQ for a device
88 * @dev: platform device
91 int platform_get_irq_byname(struct platform_device
*dev
, char *name
)
93 struct resource
*r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
,
96 return r
? r
->start
: -ENXIO
;
98 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
101 * platform_add_devices - add a numbers of platform devices
102 * @devs: array of platform devices to add
103 * @num: number of platform devices in array
105 int platform_add_devices(struct platform_device
**devs
, int num
)
109 for (i
= 0; i
< num
; i
++) {
110 ret
= platform_device_register(devs
[i
]);
113 platform_device_unregister(devs
[i
]);
120 EXPORT_SYMBOL_GPL(platform_add_devices
);
122 struct platform_object
{
123 struct platform_device pdev
;
128 * platform_device_put
129 * @pdev: platform device to free
131 * Free all memory associated with a platform device. This function must
132 * _only_ be externally called in error cases. All other usage is a bug.
134 void platform_device_put(struct platform_device
*pdev
)
137 put_device(&pdev
->dev
);
139 EXPORT_SYMBOL_GPL(platform_device_put
);
141 static void platform_device_release(struct device
*dev
)
143 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
146 kfree(pa
->pdev
.dev
.platform_data
);
147 kfree(pa
->pdev
.resource
);
152 * platform_device_alloc
153 * @name: base name of the device we're adding
156 * Create a platform device object which can have other objects attached
157 * to it, and which will have attached objects freed when it is released.
159 struct platform_device
*platform_device_alloc(const char *name
, int id
)
161 struct platform_object
*pa
;
163 pa
= kzalloc(sizeof(struct platform_object
) + strlen(name
), GFP_KERNEL
);
165 strcpy(pa
->name
, name
);
166 pa
->pdev
.name
= pa
->name
;
168 device_initialize(&pa
->pdev
.dev
);
169 pa
->pdev
.dev
.release
= platform_device_release
;
172 return pa
? &pa
->pdev
: NULL
;
174 EXPORT_SYMBOL_GPL(platform_device_alloc
);
177 * platform_device_add_resources
178 * @pdev: platform device allocated by platform_device_alloc to add resources to
179 * @res: set of resources that needs to be allocated for the device
180 * @num: number of resources
182 * Add a copy of the resources to the platform device. The memory
183 * associated with the resources will be freed when the platform device is
186 int platform_device_add_resources(struct platform_device
*pdev
,
187 struct resource
*res
, unsigned int num
)
191 r
= kmalloc(sizeof(struct resource
) * num
, GFP_KERNEL
);
193 memcpy(r
, res
, sizeof(struct resource
) * num
);
195 pdev
->num_resources
= num
;
197 return r
? 0 : -ENOMEM
;
199 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
202 * platform_device_add_data
203 * @pdev: platform device allocated by platform_device_alloc to add resources to
204 * @data: platform specific data for this platform device
205 * @size: size of platform specific data
207 * Add a copy of platform specific data to the platform device's
208 * platform_data pointer. The memory associated with the platform data
209 * will be freed when the platform device is released.
211 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
216 d
= kmalloc(size
, GFP_KERNEL
);
218 memcpy(d
, data
, size
);
219 pdev
->dev
.platform_data
= d
;
221 return d
? 0 : -ENOMEM
;
223 EXPORT_SYMBOL_GPL(platform_device_add_data
);
226 * platform_device_add - add a platform device to device hierarchy
227 * @pdev: platform device we're adding
229 * This is part 2 of platform_device_register(), though may be called
230 * separately _iff_ pdev was allocated by platform_device_alloc().
232 int platform_device_add(struct platform_device
*pdev
)
239 if (!pdev
->dev
.parent
)
240 pdev
->dev
.parent
= &platform_bus
;
242 pdev
->dev
.bus
= &platform_bus_type
;
245 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
247 dev_set_name(&pdev
->dev
, pdev
->name
);
249 for (i
= 0; i
< pdev
->num_resources
; i
++) {
250 struct resource
*p
, *r
= &pdev
->resource
[i
];
253 r
->name
= dev_name(&pdev
->dev
);
257 if (resource_type(r
) == IORESOURCE_MEM
)
259 else if (resource_type(r
) == IORESOURCE_IO
)
260 p
= &ioport_resource
;
263 if (p
&& insert_resource(p
, r
)) {
265 "%s: failed to claim resource %d\n",
266 dev_name(&pdev
->dev
), i
);
272 pr_debug("Registering platform device '%s'. Parent at %s\n",
273 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
275 ret
= device_add(&pdev
->dev
);
281 struct resource
*r
= &pdev
->resource
[i
];
282 unsigned long type
= resource_type(r
);
284 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
290 EXPORT_SYMBOL_GPL(platform_device_add
);
293 * platform_device_del - remove a platform-level device
294 * @pdev: platform device we're removing
296 * Note that this function will also release all memory- and port-based
297 * resources owned by the device (@dev->resource). This function must
298 * _only_ be externally called in error cases. All other usage is a bug.
300 void platform_device_del(struct platform_device
*pdev
)
305 device_del(&pdev
->dev
);
307 for (i
= 0; i
< pdev
->num_resources
; i
++) {
308 struct resource
*r
= &pdev
->resource
[i
];
309 unsigned long type
= resource_type(r
);
311 if (type
== IORESOURCE_MEM
|| type
== IORESOURCE_IO
)
316 EXPORT_SYMBOL_GPL(platform_device_del
);
319 * platform_device_register - add a platform-level device
320 * @pdev: platform device we're adding
322 int platform_device_register(struct platform_device
*pdev
)
324 device_initialize(&pdev
->dev
);
325 return platform_device_add(pdev
);
327 EXPORT_SYMBOL_GPL(platform_device_register
);
330 * platform_device_unregister - unregister a platform-level device
331 * @pdev: platform device we're unregistering
333 * Unregistration is done in 2 steps. First we release all resources
334 * and remove it from the subsystem, then we drop reference count by
335 * calling platform_device_put().
337 void platform_device_unregister(struct platform_device
*pdev
)
339 platform_device_del(pdev
);
340 platform_device_put(pdev
);
342 EXPORT_SYMBOL_GPL(platform_device_unregister
);
345 * platform_device_register_simple
346 * @name: base name of the device we're adding
348 * @res: set of resources that needs to be allocated for the device
349 * @num: number of resources
351 * This function creates a simple platform device that requires minimal
352 * resource and memory management. Canned release function freeing memory
353 * allocated for the device allows drivers using such devices to be
354 * unloaded without waiting for the last reference to the device to be
357 * This interface is primarily intended for use with legacy drivers which
358 * probe hardware directly. Because such drivers create sysfs device nodes
359 * themselves, rather than letting system infrastructure handle such device
360 * enumeration tasks, they don't fully conform to the Linux driver model.
361 * In particular, when such drivers are built as modules, they can't be
364 struct platform_device
*platform_device_register_simple(const char *name
,
366 struct resource
*res
,
369 struct platform_device
*pdev
;
372 pdev
= platform_device_alloc(name
, id
);
379 retval
= platform_device_add_resources(pdev
, res
, num
);
384 retval
= platform_device_add(pdev
);
391 platform_device_put(pdev
);
392 return ERR_PTR(retval
);
394 EXPORT_SYMBOL_GPL(platform_device_register_simple
);
397 * platform_device_register_data
398 * @parent: parent device for the device we're adding
399 * @name: base name of the device we're adding
401 * @data: platform specific data for this platform device
402 * @size: size of platform specific data
404 * This function creates a simple platform device that requires minimal
405 * resource and memory management. Canned release function freeing memory
406 * allocated for the device allows drivers using such devices to be
407 * unloaded without waiting for the last reference to the device to be
410 struct platform_device
*platform_device_register_data(
411 struct device
*parent
,
412 const char *name
, int id
,
413 const void *data
, size_t size
)
415 struct platform_device
*pdev
;
418 pdev
= platform_device_alloc(name
, id
);
424 pdev
->dev
.parent
= parent
;
427 retval
= platform_device_add_data(pdev
, data
, size
);
432 retval
= platform_device_add(pdev
);
439 platform_device_put(pdev
);
440 return ERR_PTR(retval
);
443 static int platform_drv_probe(struct device
*_dev
)
445 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
446 struct platform_device
*dev
= to_platform_device(_dev
);
448 return drv
->probe(dev
);
451 static int platform_drv_probe_fail(struct device
*_dev
)
456 static int platform_drv_remove(struct device
*_dev
)
458 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
459 struct platform_device
*dev
= to_platform_device(_dev
);
461 return drv
->remove(dev
);
464 static void platform_drv_shutdown(struct device
*_dev
)
466 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
467 struct platform_device
*dev
= to_platform_device(_dev
);
473 * platform_driver_register
474 * @drv: platform driver structure
476 int platform_driver_register(struct platform_driver
*drv
)
478 drv
->driver
.bus
= &platform_bus_type
;
480 drv
->driver
.probe
= platform_drv_probe
;
482 drv
->driver
.remove
= platform_drv_remove
;
484 drv
->driver
.shutdown
= platform_drv_shutdown
;
485 if (drv
->suspend
|| drv
->resume
)
486 pr_warning("Platform driver '%s' needs updating - please use "
487 "dev_pm_ops\n", drv
->driver
.name
);
489 return driver_register(&drv
->driver
);
491 EXPORT_SYMBOL_GPL(platform_driver_register
);
494 * platform_driver_unregister
495 * @drv: platform driver structure
497 void platform_driver_unregister(struct platform_driver
*drv
)
499 driver_unregister(&drv
->driver
);
501 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
504 * platform_driver_probe - register driver for non-hotpluggable device
505 * @drv: platform driver structure
506 * @probe: the driver probe routine, probably from an __init section
508 * Use this instead of platform_driver_register() when you know the device
509 * is not hotpluggable and has already been registered, and you want to
510 * remove its run-once probe() infrastructure from memory after the driver
511 * has bound to the device.
513 * One typical use for this would be with drivers for controllers integrated
514 * into system-on-chip processors, where the controller devices have been
515 * configured as part of board setup.
517 * Returns zero if the driver registered and bound to a device, else returns
518 * a negative error code and with the driver not registered.
520 int __init_or_module
platform_driver_probe(struct platform_driver
*drv
,
521 int (*probe
)(struct platform_device
*))
525 /* temporary section violation during probe() */
527 retval
= code
= platform_driver_register(drv
);
529 /* Fixup that section violation, being paranoid about code scanning
530 * the list of drivers in order to probe new devices. Check to see
531 * if the probe was successful, and make sure any forced probes of
534 spin_lock(&platform_bus_type
.p
->klist_drivers
.k_lock
);
536 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
538 drv
->driver
.probe
= platform_drv_probe_fail
;
539 spin_unlock(&platform_bus_type
.p
->klist_drivers
.k_lock
);
542 platform_driver_unregister(drv
);
545 EXPORT_SYMBOL_GPL(platform_driver_probe
);
547 /* modalias support enables more hands-off userspace setup:
548 * (a) environment variable lets new-style hotplug events work once system is
549 * fully running: "modprobe $MODALIAS"
550 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
551 * mishandled before system is fully running: "modprobe $(cat modalias)"
553 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
556 struct platform_device
*pdev
= to_platform_device(dev
);
557 int len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
559 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
562 static struct device_attribute platform_dev_attrs
[] = {
567 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
569 struct platform_device
*pdev
= to_platform_device(dev
);
571 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
572 (pdev
->id_entry
) ? pdev
->id_entry
->name
: pdev
->name
);
576 static const struct platform_device_id
*platform_match_id(
577 struct platform_device_id
*id
,
578 struct platform_device
*pdev
)
580 while (id
->name
[0]) {
581 if (strcmp(pdev
->name
, id
->name
) == 0) {
591 * platform_match - bind platform device to platform driver.
595 * Platform device IDs are assumed to be encoded like this:
596 * "<name><instance>", where <name> is a short description of the type of
597 * device, like "pci" or "floppy", and <instance> is the enumerated
598 * instance of the device, like '0' or '42'. Driver IDs are simply
599 * "<name>". So, extract the <name> from the platform_device structure,
600 * and compare it against the name of the driver. Return whether they match
603 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
605 struct platform_device
*pdev
= to_platform_device(dev
);
606 struct platform_driver
*pdrv
= to_platform_driver(drv
);
608 /* match against the id table first */
610 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
612 /* fall-back to driver name match */
613 return (strcmp(pdev
->name
, drv
->name
) == 0);
616 #ifdef CONFIG_PM_SLEEP
618 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
620 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
621 struct platform_device
*pdev
= to_platform_device(dev
);
624 if (dev
->driver
&& pdrv
->suspend
)
625 ret
= pdrv
->suspend(pdev
, mesg
);
630 static int platform_legacy_suspend_late(struct device
*dev
, pm_message_t mesg
)
632 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
633 struct platform_device
*pdev
= to_platform_device(dev
);
636 if (dev
->driver
&& pdrv
->suspend_late
)
637 ret
= pdrv
->suspend_late(pdev
, mesg
);
642 static int platform_legacy_resume_early(struct device
*dev
)
644 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
645 struct platform_device
*pdev
= to_platform_device(dev
);
648 if (dev
->driver
&& pdrv
->resume_early
)
649 ret
= pdrv
->resume_early(pdev
);
654 static int platform_legacy_resume(struct device
*dev
)
656 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
657 struct platform_device
*pdev
= to_platform_device(dev
);
660 if (dev
->driver
&& pdrv
->resume
)
661 ret
= pdrv
->resume(pdev
);
666 static int platform_pm_prepare(struct device
*dev
)
668 struct device_driver
*drv
= dev
->driver
;
671 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
672 ret
= drv
->pm
->prepare(dev
);
677 static void platform_pm_complete(struct device
*dev
)
679 struct device_driver
*drv
= dev
->driver
;
681 if (drv
&& drv
->pm
&& drv
->pm
->complete
)
682 drv
->pm
->complete(dev
);
685 #ifdef CONFIG_SUSPEND
687 static int platform_pm_suspend(struct device
*dev
)
689 struct device_driver
*drv
= dev
->driver
;
696 if (drv
->pm
->suspend
)
697 ret
= drv
->pm
->suspend(dev
);
699 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
705 static int platform_pm_suspend_noirq(struct device
*dev
)
707 struct device_driver
*drv
= dev
->driver
;
714 if (drv
->pm
->suspend_noirq
)
715 ret
= drv
->pm
->suspend_noirq(dev
);
717 ret
= platform_legacy_suspend_late(dev
, PMSG_SUSPEND
);
723 static int platform_pm_resume(struct device
*dev
)
725 struct device_driver
*drv
= dev
->driver
;
733 ret
= drv
->pm
->resume(dev
);
735 ret
= platform_legacy_resume(dev
);
741 static int platform_pm_resume_noirq(struct device
*dev
)
743 struct device_driver
*drv
= dev
->driver
;
750 if (drv
->pm
->resume_noirq
)
751 ret
= drv
->pm
->resume_noirq(dev
);
753 ret
= platform_legacy_resume_early(dev
);
759 #else /* !CONFIG_SUSPEND */
761 #define platform_pm_suspend NULL
762 #define platform_pm_resume NULL
763 #define platform_pm_suspend_noirq NULL
764 #define platform_pm_resume_noirq NULL
766 #endif /* !CONFIG_SUSPEND */
768 #ifdef CONFIG_HIBERNATION
770 static int platform_pm_freeze(struct device
*dev
)
772 struct device_driver
*drv
= dev
->driver
;
780 ret
= drv
->pm
->freeze(dev
);
782 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
788 static int platform_pm_freeze_noirq(struct device
*dev
)
790 struct device_driver
*drv
= dev
->driver
;
797 if (drv
->pm
->freeze_noirq
)
798 ret
= drv
->pm
->freeze_noirq(dev
);
800 ret
= platform_legacy_suspend_late(dev
, PMSG_FREEZE
);
806 static int platform_pm_thaw(struct device
*dev
)
808 struct device_driver
*drv
= dev
->driver
;
816 ret
= drv
->pm
->thaw(dev
);
818 ret
= platform_legacy_resume(dev
);
824 static int platform_pm_thaw_noirq(struct device
*dev
)
826 struct device_driver
*drv
= dev
->driver
;
833 if (drv
->pm
->thaw_noirq
)
834 ret
= drv
->pm
->thaw_noirq(dev
);
836 ret
= platform_legacy_resume_early(dev
);
842 static int platform_pm_poweroff(struct device
*dev
)
844 struct device_driver
*drv
= dev
->driver
;
851 if (drv
->pm
->poweroff
)
852 ret
= drv
->pm
->poweroff(dev
);
854 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
860 static int platform_pm_poweroff_noirq(struct device
*dev
)
862 struct device_driver
*drv
= dev
->driver
;
869 if (drv
->pm
->poweroff_noirq
)
870 ret
= drv
->pm
->poweroff_noirq(dev
);
872 ret
= platform_legacy_suspend_late(dev
, PMSG_HIBERNATE
);
878 static int platform_pm_restore(struct device
*dev
)
880 struct device_driver
*drv
= dev
->driver
;
887 if (drv
->pm
->restore
)
888 ret
= drv
->pm
->restore(dev
);
890 ret
= platform_legacy_resume(dev
);
896 static int platform_pm_restore_noirq(struct device
*dev
)
898 struct device_driver
*drv
= dev
->driver
;
905 if (drv
->pm
->restore_noirq
)
906 ret
= drv
->pm
->restore_noirq(dev
);
908 ret
= platform_legacy_resume_early(dev
);
914 #else /* !CONFIG_HIBERNATION */
916 #define platform_pm_freeze NULL
917 #define platform_pm_thaw NULL
918 #define platform_pm_poweroff NULL
919 #define platform_pm_restore NULL
920 #define platform_pm_freeze_noirq NULL
921 #define platform_pm_thaw_noirq NULL
922 #define platform_pm_poweroff_noirq NULL
923 #define platform_pm_restore_noirq NULL
925 #endif /* !CONFIG_HIBERNATION */
927 static struct dev_pm_ops platform_dev_pm_ops
= {
928 .prepare
= platform_pm_prepare
,
929 .complete
= platform_pm_complete
,
930 .suspend
= platform_pm_suspend
,
931 .resume
= platform_pm_resume
,
932 .freeze
= platform_pm_freeze
,
933 .thaw
= platform_pm_thaw
,
934 .poweroff
= platform_pm_poweroff
,
935 .restore
= platform_pm_restore
,
936 .suspend_noirq
= platform_pm_suspend_noirq
,
937 .resume_noirq
= platform_pm_resume_noirq
,
938 .freeze_noirq
= platform_pm_freeze_noirq
,
939 .thaw_noirq
= platform_pm_thaw_noirq
,
940 .poweroff_noirq
= platform_pm_poweroff_noirq
,
941 .restore_noirq
= platform_pm_restore_noirq
,
944 #define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops)
946 #else /* !CONFIG_PM_SLEEP */
948 #define PLATFORM_PM_OPS_PTR NULL
950 #endif /* !CONFIG_PM_SLEEP */
952 struct bus_type platform_bus_type
= {
954 .dev_attrs
= platform_dev_attrs
,
955 .match
= platform_match
,
956 .uevent
= platform_uevent
,
957 .pm
= PLATFORM_PM_OPS_PTR
,
959 EXPORT_SYMBOL_GPL(platform_bus_type
);
961 int __init
platform_bus_init(void)
965 early_platform_cleanup();
967 error
= device_register(&platform_bus
);
970 error
= bus_register(&platform_bus_type
);
972 device_unregister(&platform_bus
);
976 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
977 u64
dma_get_required_mask(struct device
*dev
)
979 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
980 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
983 if (!high_totalram
) {
984 /* convert to mask just covering totalram */
985 low_totalram
= (1 << (fls(low_totalram
) - 1));
986 low_totalram
+= low_totalram
- 1;
989 high_totalram
= (1 << (fls(high_totalram
) - 1));
990 high_totalram
+= high_totalram
- 1;
991 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
995 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
998 static __initdata
LIST_HEAD(early_platform_driver_list
);
999 static __initdata
LIST_HEAD(early_platform_device_list
);
1002 * early_platform_driver_register
1003 * @epdrv: early_platform driver structure
1004 * @buf: string passed from early_param()
1006 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1009 unsigned long index
;
1012 /* Simply add the driver to the end of the global list.
1013 * Drivers will by default be put on the list in compiled-in order.
1015 if (!epdrv
->list
.next
) {
1016 INIT_LIST_HEAD(&epdrv
->list
);
1017 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1020 /* If the user has specified device then make sure the driver
1021 * gets prioritized. The driver of the last device specified on
1022 * command line will be put first on the list.
1024 n
= strlen(epdrv
->pdrv
->driver
.name
);
1025 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1026 list_move(&epdrv
->list
, &early_platform_driver_list
);
1028 if (!strcmp(buf
, epdrv
->pdrv
->driver
.name
))
1029 epdrv
->requested_id
= -1;
1030 else if (buf
[n
] == '.' && strict_strtoul(&buf
[n
+ 1], 10,
1032 epdrv
->requested_id
= index
;
1034 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1041 * early_platform_add_devices - add a numbers of early platform devices
1042 * @devs: array of early platform devices to add
1043 * @num: number of early platform devices in array
1045 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1050 /* simply add the devices to list */
1051 for (i
= 0; i
< num
; i
++) {
1052 dev
= &devs
[i
]->dev
;
1054 if (!dev
->devres_head
.next
) {
1055 INIT_LIST_HEAD(&dev
->devres_head
);
1056 list_add_tail(&dev
->devres_head
,
1057 &early_platform_device_list
);
1063 * early_platform_driver_register_all
1064 * @class_str: string to identify early platform driver class
1066 void __init
early_platform_driver_register_all(char *class_str
)
1068 /* The "class_str" parameter may or may not be present on the kernel
1069 * command line. If it is present then there may be more than one
1070 * matching parameter.
1072 * Since we register our early platform drivers using early_param()
1073 * we need to make sure that they also get registered in the case
1074 * when the parameter is missing from the kernel command line.
1076 * We use parse_early_options() to make sure the early_param() gets
1077 * called at least once. The early_param() may be called more than
1078 * once since the name of the preferred device may be specified on
1079 * the kernel command line. early_platform_driver_register() handles
1082 parse_early_options(class_str
);
1086 * early_platform_match
1087 * @epdrv: early platform driver structure
1088 * @id: id to match against
1090 static __init
struct platform_device
*
1091 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1093 struct platform_device
*pd
;
1095 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1096 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1104 * early_platform_left
1105 * @epdrv: early platform driver structure
1106 * @id: return true if id or above exists
1108 static __init
int early_platform_left(struct early_platform_driver
*epdrv
,
1111 struct platform_device
*pd
;
1113 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1114 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1122 * early_platform_driver_probe_id
1123 * @class_str: string to identify early platform driver class
1124 * @id: id to match against
1125 * @nr_probe: number of platform devices to successfully probe before exiting
1127 static int __init
early_platform_driver_probe_id(char *class_str
,
1131 struct early_platform_driver
*epdrv
;
1132 struct platform_device
*match
;
1137 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1138 /* only use drivers matching our class_str */
1139 if (strcmp(class_str
, epdrv
->class_str
))
1143 match_id
= epdrv
->requested_id
;
1148 left
+= early_platform_left(epdrv
, id
);
1150 /* skip requested id */
1151 switch (epdrv
->requested_id
) {
1152 case EARLY_PLATFORM_ID_ERROR
:
1153 case EARLY_PLATFORM_ID_UNSET
:
1156 if (epdrv
->requested_id
== id
)
1157 match_id
= EARLY_PLATFORM_ID_UNSET
;
1162 case EARLY_PLATFORM_ID_ERROR
:
1163 pr_warning("%s: unable to parse %s parameter\n",
1164 class_str
, epdrv
->pdrv
->driver
.name
);
1166 case EARLY_PLATFORM_ID_UNSET
:
1170 match
= early_platform_match(epdrv
, match_id
);
1174 if (epdrv
->pdrv
->probe(match
))
1175 pr_warning("%s: unable to probe %s early.\n",
1176 class_str
, match
->name
);
1192 * early_platform_driver_probe
1193 * @class_str: string to identify early platform driver class
1194 * @nr_probe: number of platform devices to successfully probe before exiting
1195 * @user_only: only probe user specified early platform devices
1197 int __init
early_platform_driver_probe(char *class_str
,
1204 for (i
= -2; n
< nr_probe
; i
++) {
1205 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1220 * early_platform_cleanup - clean up early platform code
1222 void __init
early_platform_cleanup(void)
1224 struct platform_device
*pd
, *pd2
;
1226 /* clean up the devres list used to chain devices */
1227 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1229 list_del(&pd
->dev
.devres_head
);
1230 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));