1 // SPDX-License-Identifier: GPL-2.0
3 * platform.c - platform 'pseudo' bus for legacy devices
5 * Copyright (c) 2002-3 Patrick Mochel
6 * Copyright (c) 2002-3 Open Source Development Labs
8 * Please see Documentation/driver-model/platform.txt for more
12 #include <linux/string.h>
13 #include <linux/platform_device.h>
14 #include <linux/of_device.h>
15 #include <linux/of_irq.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/pm_domain.h>
24 #include <linux/idr.h>
25 #include <linux/acpi.h>
26 #include <linux/clk/clk-conf.h>
27 #include <linux/limits.h>
28 #include <linux/property.h>
31 #include "power/power.h"
33 /* For automatically allocated device IDs */
34 static DEFINE_IDA(platform_devid_ida
);
36 struct device platform_bus
= {
37 .init_name
= "platform",
39 EXPORT_SYMBOL_GPL(platform_bus
);
42 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
43 * @pdev: platform device
45 * This is called before platform_device_add() such that any pdev_archdata may
46 * be setup before the platform_notifier is called. So if a user needs to
47 * manipulate any relevant information in the pdev_archdata they can do:
49 * platform_device_alloc()
51 * platform_device_add()
53 * And if they don't care they can just call platform_device_register() and
54 * everything will just work out.
56 void __weak
arch_setup_pdev_archdata(struct platform_device
*pdev
)
61 * platform_get_resource - get a resource for a device
62 * @dev: platform device
63 * @type: resource type
64 * @num: resource index
66 struct resource
*platform_get_resource(struct platform_device
*dev
,
67 unsigned int type
, unsigned int num
)
71 for (i
= 0; i
< dev
->num_resources
; i
++) {
72 struct resource
*r
= &dev
->resource
[i
];
74 if (type
== resource_type(r
) && num
-- == 0)
79 EXPORT_SYMBOL_GPL(platform_get_resource
);
82 * platform_get_irq - get an IRQ for a device
83 * @dev: platform device
84 * @num: IRQ number index
86 int platform_get_irq(struct platform_device
*dev
, unsigned int num
)
89 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
90 if (!dev
|| num
>= dev
->archdata
.num_irqs
)
92 return dev
->archdata
.irqs
[num
];
95 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
98 ret
= of_irq_get(dev
->dev
.of_node
, num
);
99 if (ret
> 0 || ret
== -EPROBE_DEFER
)
103 r
= platform_get_resource(dev
, IORESOURCE_IRQ
, num
);
104 if (has_acpi_companion(&dev
->dev
)) {
105 if (r
&& r
->flags
& IORESOURCE_DISABLED
) {
108 ret
= acpi_irq_get(ACPI_HANDLE(&dev
->dev
), num
, r
);
115 * The resources may pass trigger flags to the irqs that need
116 * to be set up. It so happens that the trigger flags for
117 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
120 if (r
&& r
->flags
& IORESOURCE_BITS
) {
121 struct irq_data
*irqd
;
123 irqd
= irq_get_irq_data(r
->start
);
126 irqd_set_trigger_type(irqd
, r
->flags
& IORESOURCE_BITS
);
129 return r
? r
->start
: -ENXIO
;
132 EXPORT_SYMBOL_GPL(platform_get_irq
);
135 * platform_irq_count - Count the number of IRQs a platform device uses
136 * @dev: platform device
138 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
140 int platform_irq_count(struct platform_device
*dev
)
144 while ((ret
= platform_get_irq(dev
, nr
)) >= 0)
147 if (ret
== -EPROBE_DEFER
)
152 EXPORT_SYMBOL_GPL(platform_irq_count
);
155 * platform_get_resource_byname - get a resource for a device by name
156 * @dev: platform device
157 * @type: resource type
158 * @name: resource name
160 struct resource
*platform_get_resource_byname(struct platform_device
*dev
,
166 for (i
= 0; i
< dev
->num_resources
; i
++) {
167 struct resource
*r
= &dev
->resource
[i
];
169 if (unlikely(!r
->name
))
172 if (type
== resource_type(r
) && !strcmp(r
->name
, name
))
177 EXPORT_SYMBOL_GPL(platform_get_resource_byname
);
180 * platform_get_irq_byname - get an IRQ for a device by name
181 * @dev: platform device
184 int platform_get_irq_byname(struct platform_device
*dev
, const char *name
)
188 if (IS_ENABLED(CONFIG_OF_IRQ
) && dev
->dev
.of_node
) {
191 ret
= of_irq_get_byname(dev
->dev
.of_node
, name
);
192 if (ret
> 0 || ret
== -EPROBE_DEFER
)
196 r
= platform_get_resource_byname(dev
, IORESOURCE_IRQ
, name
);
197 return r
? r
->start
: -ENXIO
;
199 EXPORT_SYMBOL_GPL(platform_get_irq_byname
);
202 * platform_add_devices - add a numbers of platform devices
203 * @devs: array of platform devices to add
204 * @num: number of platform devices in array
206 int platform_add_devices(struct platform_device
**devs
, int num
)
210 for (i
= 0; i
< num
; i
++) {
211 ret
= platform_device_register(devs
[i
]);
214 platform_device_unregister(devs
[i
]);
221 EXPORT_SYMBOL_GPL(platform_add_devices
);
223 struct platform_object
{
224 struct platform_device pdev
;
229 * platform_device_put - destroy a platform device
230 * @pdev: platform device to free
232 * Free all memory associated with a platform device. This function must
233 * _only_ be externally called in error cases. All other usage is a bug.
235 void platform_device_put(struct platform_device
*pdev
)
238 put_device(&pdev
->dev
);
240 EXPORT_SYMBOL_GPL(platform_device_put
);
242 static void platform_device_release(struct device
*dev
)
244 struct platform_object
*pa
= container_of(dev
, struct platform_object
,
247 of_device_node_put(&pa
->pdev
.dev
);
248 kfree(pa
->pdev
.dev
.platform_data
);
249 kfree(pa
->pdev
.mfd_cell
);
250 kfree(pa
->pdev
.resource
);
251 kfree(pa
->pdev
.driver_override
);
256 * platform_device_alloc - create a platform device
257 * @name: base name of the device we're adding
260 * Create a platform device object which can have other objects attached
261 * to it, and which will have attached objects freed when it is released.
263 struct platform_device
*platform_device_alloc(const char *name
, int id
)
265 struct platform_object
*pa
;
267 pa
= kzalloc(sizeof(*pa
) + strlen(name
) + 1, GFP_KERNEL
);
269 strcpy(pa
->name
, name
);
270 pa
->pdev
.name
= pa
->name
;
272 device_initialize(&pa
->pdev
.dev
);
273 pa
->pdev
.dev
.release
= platform_device_release
;
274 arch_setup_pdev_archdata(&pa
->pdev
);
277 return pa
? &pa
->pdev
: NULL
;
279 EXPORT_SYMBOL_GPL(platform_device_alloc
);
282 * platform_device_add_resources - add resources to a platform device
283 * @pdev: platform device allocated by platform_device_alloc to add resources to
284 * @res: set of resources that needs to be allocated for the device
285 * @num: number of resources
287 * Add a copy of the resources to the platform device. The memory
288 * associated with the resources will be freed when the platform device is
291 int platform_device_add_resources(struct platform_device
*pdev
,
292 const struct resource
*res
, unsigned int num
)
294 struct resource
*r
= NULL
;
297 r
= kmemdup(res
, sizeof(struct resource
) * num
, GFP_KERNEL
);
302 kfree(pdev
->resource
);
304 pdev
->num_resources
= num
;
307 EXPORT_SYMBOL_GPL(platform_device_add_resources
);
310 * platform_device_add_data - add platform-specific data to a platform device
311 * @pdev: platform device allocated by platform_device_alloc to add resources to
312 * @data: platform specific data for this platform device
313 * @size: size of platform specific data
315 * Add a copy of platform specific data to the platform device's
316 * platform_data pointer. The memory associated with the platform data
317 * will be freed when the platform device is released.
319 int platform_device_add_data(struct platform_device
*pdev
, const void *data
,
325 d
= kmemdup(data
, size
, GFP_KERNEL
);
330 kfree(pdev
->dev
.platform_data
);
331 pdev
->dev
.platform_data
= d
;
334 EXPORT_SYMBOL_GPL(platform_device_add_data
);
337 * platform_device_add_properties - add built-in properties to a platform device
338 * @pdev: platform device to add properties to
339 * @properties: null terminated array of properties to add
341 * The function will take deep copy of @properties and attach the copy to the
342 * platform device. The memory associated with properties will be freed when the
343 * platform device is released.
345 int platform_device_add_properties(struct platform_device
*pdev
,
346 const struct property_entry
*properties
)
348 return device_add_properties(&pdev
->dev
, properties
);
350 EXPORT_SYMBOL_GPL(platform_device_add_properties
);
353 * platform_device_add - add a platform device to device hierarchy
354 * @pdev: platform device we're adding
356 * This is part 2 of platform_device_register(), though may be called
357 * separately _iff_ pdev was allocated by platform_device_alloc().
359 int platform_device_add(struct platform_device
*pdev
)
366 if (!pdev
->dev
.parent
)
367 pdev
->dev
.parent
= &platform_bus
;
369 pdev
->dev
.bus
= &platform_bus_type
;
373 dev_set_name(&pdev
->dev
, "%s.%d", pdev
->name
, pdev
->id
);
375 case PLATFORM_DEVID_NONE
:
376 dev_set_name(&pdev
->dev
, "%s", pdev
->name
);
378 case PLATFORM_DEVID_AUTO
:
380 * Automatically allocated device ID. We mark it as such so
381 * that we remember it must be freed, and we append a suffix
382 * to avoid namespace collision with explicit IDs.
384 ret
= ida_simple_get(&platform_devid_ida
, 0, 0, GFP_KERNEL
);
388 pdev
->id_auto
= true;
389 dev_set_name(&pdev
->dev
, "%s.%d.auto", pdev
->name
, pdev
->id
);
393 for (i
= 0; i
< pdev
->num_resources
; i
++) {
394 struct resource
*p
, *r
= &pdev
->resource
[i
];
397 r
->name
= dev_name(&pdev
->dev
);
401 if (resource_type(r
) == IORESOURCE_MEM
)
403 else if (resource_type(r
) == IORESOURCE_IO
)
404 p
= &ioport_resource
;
407 if (p
&& insert_resource(p
, r
)) {
408 dev_err(&pdev
->dev
, "failed to claim resource %d: %pR\n", i
, r
);
414 pr_debug("Registering platform device '%s'. Parent at %s\n",
415 dev_name(&pdev
->dev
), dev_name(pdev
->dev
.parent
));
417 ret
= device_add(&pdev
->dev
);
423 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
424 pdev
->id
= PLATFORM_DEVID_AUTO
;
428 struct resource
*r
= &pdev
->resource
[i
];
436 EXPORT_SYMBOL_GPL(platform_device_add
);
439 * platform_device_del - remove a platform-level device
440 * @pdev: platform device we're removing
442 * Note that this function will also release all memory- and port-based
443 * resources owned by the device (@dev->resource). This function must
444 * _only_ be externally called in error cases. All other usage is a bug.
446 void platform_device_del(struct platform_device
*pdev
)
451 device_remove_properties(&pdev
->dev
);
452 device_del(&pdev
->dev
);
455 ida_simple_remove(&platform_devid_ida
, pdev
->id
);
456 pdev
->id
= PLATFORM_DEVID_AUTO
;
459 for (i
= 0; i
< pdev
->num_resources
; i
++) {
460 struct resource
*r
= &pdev
->resource
[i
];
466 EXPORT_SYMBOL_GPL(platform_device_del
);
469 * platform_device_register - add a platform-level device
470 * @pdev: platform device we're adding
472 int platform_device_register(struct platform_device
*pdev
)
474 device_initialize(&pdev
->dev
);
475 arch_setup_pdev_archdata(pdev
);
476 return platform_device_add(pdev
);
478 EXPORT_SYMBOL_GPL(platform_device_register
);
481 * platform_device_unregister - unregister a platform-level device
482 * @pdev: platform device we're unregistering
484 * Unregistration is done in 2 steps. First we release all resources
485 * and remove it from the subsystem, then we drop reference count by
486 * calling platform_device_put().
488 void platform_device_unregister(struct platform_device
*pdev
)
490 platform_device_del(pdev
);
491 platform_device_put(pdev
);
493 EXPORT_SYMBOL_GPL(platform_device_unregister
);
496 * platform_device_register_full - add a platform-level device with
497 * resources and platform-specific data
499 * @pdevinfo: data used to create device
501 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
503 struct platform_device
*platform_device_register_full(
504 const struct platform_device_info
*pdevinfo
)
507 struct platform_device
*pdev
;
509 pdev
= platform_device_alloc(pdevinfo
->name
, pdevinfo
->id
);
513 pdev
->dev
.parent
= pdevinfo
->parent
;
514 pdev
->dev
.fwnode
= pdevinfo
->fwnode
;
516 if (pdevinfo
->dma_mask
) {
518 * This memory isn't freed when the device is put,
519 * I don't have a nice idea for that though. Conceptually
520 * dma_mask in struct device should not be a pointer.
521 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
524 kmalloc(sizeof(*pdev
->dev
.dma_mask
), GFP_KERNEL
);
525 if (!pdev
->dev
.dma_mask
)
528 *pdev
->dev
.dma_mask
= pdevinfo
->dma_mask
;
529 pdev
->dev
.coherent_dma_mask
= pdevinfo
->dma_mask
;
532 ret
= platform_device_add_resources(pdev
,
533 pdevinfo
->res
, pdevinfo
->num_res
);
537 ret
= platform_device_add_data(pdev
,
538 pdevinfo
->data
, pdevinfo
->size_data
);
542 if (pdevinfo
->properties
) {
543 ret
= platform_device_add_properties(pdev
,
544 pdevinfo
->properties
);
549 ret
= platform_device_add(pdev
);
552 ACPI_COMPANION_SET(&pdev
->dev
, NULL
);
553 kfree(pdev
->dev
.dma_mask
);
556 platform_device_put(pdev
);
562 EXPORT_SYMBOL_GPL(platform_device_register_full
);
564 static int platform_drv_probe(struct device
*_dev
)
566 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
567 struct platform_device
*dev
= to_platform_device(_dev
);
570 ret
= of_clk_set_defaults(_dev
->of_node
, false);
574 ret
= dev_pm_domain_attach(_dev
, true);
575 if (ret
!= -EPROBE_DEFER
) {
577 ret
= drv
->probe(dev
);
579 dev_pm_domain_detach(_dev
, true);
581 /* don't fail if just dev_pm_domain_attach failed */
586 if (drv
->prevent_deferred_probe
&& ret
== -EPROBE_DEFER
) {
587 dev_warn(_dev
, "probe deferral not supported\n");
594 static int platform_drv_probe_fail(struct device
*_dev
)
599 static int platform_drv_remove(struct device
*_dev
)
601 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
602 struct platform_device
*dev
= to_platform_device(_dev
);
606 ret
= drv
->remove(dev
);
607 dev_pm_domain_detach(_dev
, true);
612 static void platform_drv_shutdown(struct device
*_dev
)
614 struct platform_driver
*drv
= to_platform_driver(_dev
->driver
);
615 struct platform_device
*dev
= to_platform_device(_dev
);
622 * __platform_driver_register - register a driver for platform-level devices
623 * @drv: platform driver structure
624 * @owner: owning module/driver
626 int __platform_driver_register(struct platform_driver
*drv
,
627 struct module
*owner
)
629 drv
->driver
.owner
= owner
;
630 drv
->driver
.bus
= &platform_bus_type
;
631 drv
->driver
.probe
= platform_drv_probe
;
632 drv
->driver
.remove
= platform_drv_remove
;
633 drv
->driver
.shutdown
= platform_drv_shutdown
;
635 return driver_register(&drv
->driver
);
637 EXPORT_SYMBOL_GPL(__platform_driver_register
);
640 * platform_driver_unregister - unregister a driver for platform-level devices
641 * @drv: platform driver structure
643 void platform_driver_unregister(struct platform_driver
*drv
)
645 driver_unregister(&drv
->driver
);
647 EXPORT_SYMBOL_GPL(platform_driver_unregister
);
650 * __platform_driver_probe - register driver for non-hotpluggable device
651 * @drv: platform driver structure
652 * @probe: the driver probe routine, probably from an __init section
653 * @module: module which will be the owner of the driver
655 * Use this instead of platform_driver_register() when you know the device
656 * is not hotpluggable and has already been registered, and you want to
657 * remove its run-once probe() infrastructure from memory after the driver
658 * has bound to the device.
660 * One typical use for this would be with drivers for controllers integrated
661 * into system-on-chip processors, where the controller devices have been
662 * configured as part of board setup.
664 * Note that this is incompatible with deferred probing.
666 * Returns zero if the driver registered and bound to a device, else returns
667 * a negative error code and with the driver not registered.
669 int __init_or_module
__platform_driver_probe(struct platform_driver
*drv
,
670 int (*probe
)(struct platform_device
*), struct module
*module
)
674 if (drv
->driver
.probe_type
== PROBE_PREFER_ASYNCHRONOUS
) {
675 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
676 drv
->driver
.name
, __func__
);
681 * We have to run our probes synchronously because we check if
682 * we find any devices to bind to and exit with error if there
685 drv
->driver
.probe_type
= PROBE_FORCE_SYNCHRONOUS
;
688 * Prevent driver from requesting probe deferral to avoid further
689 * futile probe attempts.
691 drv
->prevent_deferred_probe
= true;
693 /* make sure driver won't have bind/unbind attributes */
694 drv
->driver
.suppress_bind_attrs
= true;
696 /* temporary section violation during probe() */
698 retval
= code
= __platform_driver_register(drv
, module
);
701 * Fixup that section violation, being paranoid about code scanning
702 * the list of drivers in order to probe new devices. Check to see
703 * if the probe was successful, and make sure any forced probes of
706 spin_lock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
708 if (code
== 0 && list_empty(&drv
->driver
.p
->klist_devices
.k_list
))
710 drv
->driver
.probe
= platform_drv_probe_fail
;
711 spin_unlock(&drv
->driver
.bus
->p
->klist_drivers
.k_lock
);
714 platform_driver_unregister(drv
);
717 EXPORT_SYMBOL_GPL(__platform_driver_probe
);
720 * __platform_create_bundle - register driver and create corresponding device
721 * @driver: platform driver structure
722 * @probe: the driver probe routine, probably from an __init section
723 * @res: set of resources that needs to be allocated for the device
724 * @n_res: number of resources
725 * @data: platform specific data for this platform device
726 * @size: size of platform specific data
727 * @module: module which will be the owner of the driver
729 * Use this in legacy-style modules that probe hardware directly and
730 * register a single platform device and corresponding platform driver.
732 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
734 struct platform_device
* __init_or_module
__platform_create_bundle(
735 struct platform_driver
*driver
,
736 int (*probe
)(struct platform_device
*),
737 struct resource
*res
, unsigned int n_res
,
738 const void *data
, size_t size
, struct module
*module
)
740 struct platform_device
*pdev
;
743 pdev
= platform_device_alloc(driver
->driver
.name
, -1);
749 error
= platform_device_add_resources(pdev
, res
, n_res
);
753 error
= platform_device_add_data(pdev
, data
, size
);
757 error
= platform_device_add(pdev
);
761 error
= __platform_driver_probe(driver
, probe
, module
);
768 platform_device_del(pdev
);
770 platform_device_put(pdev
);
772 return ERR_PTR(error
);
774 EXPORT_SYMBOL_GPL(__platform_create_bundle
);
777 * __platform_register_drivers - register an array of platform drivers
778 * @drivers: an array of drivers to register
779 * @count: the number of drivers to register
780 * @owner: module owning the drivers
782 * Registers platform drivers specified by an array. On failure to register a
783 * driver, all previously registered drivers will be unregistered. Callers of
784 * this API should use platform_unregister_drivers() to unregister drivers in
787 * Returns: 0 on success or a negative error code on failure.
789 int __platform_register_drivers(struct platform_driver
* const *drivers
,
790 unsigned int count
, struct module
*owner
)
795 for (i
= 0; i
< count
; i
++) {
796 pr_debug("registering platform driver %ps\n", drivers
[i
]);
798 err
= __platform_driver_register(drivers
[i
], owner
);
800 pr_err("failed to register platform driver %ps: %d\n",
810 pr_debug("unregistering platform driver %ps\n", drivers
[i
]);
811 platform_driver_unregister(drivers
[i
]);
816 EXPORT_SYMBOL_GPL(__platform_register_drivers
);
819 * platform_unregister_drivers - unregister an array of platform drivers
820 * @drivers: an array of drivers to unregister
821 * @count: the number of drivers to unregister
823 * Unegisters platform drivers specified by an array. This is typically used
824 * to complement an earlier call to platform_register_drivers(). Drivers are
825 * unregistered in the reverse order in which they were registered.
827 void platform_unregister_drivers(struct platform_driver
* const *drivers
,
831 pr_debug("unregistering platform driver %ps\n", drivers
[count
]);
832 platform_driver_unregister(drivers
[count
]);
835 EXPORT_SYMBOL_GPL(platform_unregister_drivers
);
837 /* modalias support enables more hands-off userspace setup:
838 * (a) environment variable lets new-style hotplug events work once system is
839 * fully running: "modprobe $MODALIAS"
840 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
841 * mishandled before system is fully running: "modprobe $(cat modalias)"
843 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*a
,
846 struct platform_device
*pdev
= to_platform_device(dev
);
849 len
= of_device_modalias(dev
, buf
, PAGE_SIZE
);
853 len
= acpi_device_modalias(dev
, buf
, PAGE_SIZE
-1);
857 len
= snprintf(buf
, PAGE_SIZE
, "platform:%s\n", pdev
->name
);
859 return (len
>= PAGE_SIZE
) ? (PAGE_SIZE
- 1) : len
;
861 static DEVICE_ATTR_RO(modalias
);
863 static ssize_t
driver_override_store(struct device
*dev
,
864 struct device_attribute
*attr
,
865 const char *buf
, size_t count
)
867 struct platform_device
*pdev
= to_platform_device(dev
);
868 char *driver_override
, *old
, *cp
;
870 /* We need to keep extra room for a newline */
871 if (count
>= (PAGE_SIZE
- 1))
874 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
875 if (!driver_override
)
878 cp
= strchr(driver_override
, '\n');
883 old
= pdev
->driver_override
;
884 if (strlen(driver_override
)) {
885 pdev
->driver_override
= driver_override
;
887 kfree(driver_override
);
888 pdev
->driver_override
= NULL
;
897 static ssize_t
driver_override_show(struct device
*dev
,
898 struct device_attribute
*attr
, char *buf
)
900 struct platform_device
*pdev
= to_platform_device(dev
);
904 len
= sprintf(buf
, "%s\n", pdev
->driver_override
);
908 static DEVICE_ATTR_RW(driver_override
);
911 static struct attribute
*platform_dev_attrs
[] = {
912 &dev_attr_modalias
.attr
,
913 &dev_attr_driver_override
.attr
,
916 ATTRIBUTE_GROUPS(platform_dev
);
918 static int platform_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
920 struct platform_device
*pdev
= to_platform_device(dev
);
923 /* Some devices have extra OF data and an OF-style MODALIAS */
924 rc
= of_device_uevent_modalias(dev
, env
);
928 rc
= acpi_device_uevent_modalias(dev
, env
);
932 add_uevent_var(env
, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX
,
937 static const struct platform_device_id
*platform_match_id(
938 const struct platform_device_id
*id
,
939 struct platform_device
*pdev
)
941 while (id
->name
[0]) {
942 if (strcmp(pdev
->name
, id
->name
) == 0) {
952 * platform_match - bind platform device to platform driver.
956 * Platform device IDs are assumed to be encoded like this:
957 * "<name><instance>", where <name> is a short description of the type of
958 * device, like "pci" or "floppy", and <instance> is the enumerated
959 * instance of the device, like '0' or '42'. Driver IDs are simply
960 * "<name>". So, extract the <name> from the platform_device structure,
961 * and compare it against the name of the driver. Return whether they match
964 static int platform_match(struct device
*dev
, struct device_driver
*drv
)
966 struct platform_device
*pdev
= to_platform_device(dev
);
967 struct platform_driver
*pdrv
= to_platform_driver(drv
);
969 /* When driver_override is set, only bind to the matching driver */
970 if (pdev
->driver_override
)
971 return !strcmp(pdev
->driver_override
, drv
->name
);
973 /* Attempt an OF style match first */
974 if (of_driver_match_device(dev
, drv
))
977 /* Then try ACPI style match */
978 if (acpi_driver_match_device(dev
, drv
))
981 /* Then try to match against the id table */
983 return platform_match_id(pdrv
->id_table
, pdev
) != NULL
;
985 /* fall-back to driver name match */
986 return (strcmp(pdev
->name
, drv
->name
) == 0);
989 #ifdef CONFIG_PM_SLEEP
991 static int platform_legacy_suspend(struct device
*dev
, pm_message_t mesg
)
993 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
994 struct platform_device
*pdev
= to_platform_device(dev
);
997 if (dev
->driver
&& pdrv
->suspend
)
998 ret
= pdrv
->suspend(pdev
, mesg
);
1003 static int platform_legacy_resume(struct device
*dev
)
1005 struct platform_driver
*pdrv
= to_platform_driver(dev
->driver
);
1006 struct platform_device
*pdev
= to_platform_device(dev
);
1009 if (dev
->driver
&& pdrv
->resume
)
1010 ret
= pdrv
->resume(pdev
);
1015 #endif /* CONFIG_PM_SLEEP */
1017 #ifdef CONFIG_SUSPEND
1019 int platform_pm_suspend(struct device
*dev
)
1021 struct device_driver
*drv
= dev
->driver
;
1028 if (drv
->pm
->suspend
)
1029 ret
= drv
->pm
->suspend(dev
);
1031 ret
= platform_legacy_suspend(dev
, PMSG_SUSPEND
);
1037 int platform_pm_resume(struct device
*dev
)
1039 struct device_driver
*drv
= dev
->driver
;
1046 if (drv
->pm
->resume
)
1047 ret
= drv
->pm
->resume(dev
);
1049 ret
= platform_legacy_resume(dev
);
1055 #endif /* CONFIG_SUSPEND */
1057 #ifdef CONFIG_HIBERNATE_CALLBACKS
1059 int platform_pm_freeze(struct device
*dev
)
1061 struct device_driver
*drv
= dev
->driver
;
1068 if (drv
->pm
->freeze
)
1069 ret
= drv
->pm
->freeze(dev
);
1071 ret
= platform_legacy_suspend(dev
, PMSG_FREEZE
);
1077 int platform_pm_thaw(struct device
*dev
)
1079 struct device_driver
*drv
= dev
->driver
;
1087 ret
= drv
->pm
->thaw(dev
);
1089 ret
= platform_legacy_resume(dev
);
1095 int platform_pm_poweroff(struct device
*dev
)
1097 struct device_driver
*drv
= dev
->driver
;
1104 if (drv
->pm
->poweroff
)
1105 ret
= drv
->pm
->poweroff(dev
);
1107 ret
= platform_legacy_suspend(dev
, PMSG_HIBERNATE
);
1113 int platform_pm_restore(struct device
*dev
)
1115 struct device_driver
*drv
= dev
->driver
;
1122 if (drv
->pm
->restore
)
1123 ret
= drv
->pm
->restore(dev
);
1125 ret
= platform_legacy_resume(dev
);
1131 #endif /* CONFIG_HIBERNATE_CALLBACKS */
1133 static const struct dev_pm_ops platform_dev_pm_ops
= {
1134 .runtime_suspend
= pm_generic_runtime_suspend
,
1135 .runtime_resume
= pm_generic_runtime_resume
,
1136 USE_PLATFORM_PM_SLEEP_OPS
1139 struct bus_type platform_bus_type
= {
1141 .dev_groups
= platform_dev_groups
,
1142 .match
= platform_match
,
1143 .uevent
= platform_uevent
,
1144 .pm
= &platform_dev_pm_ops
,
1147 EXPORT_SYMBOL_GPL(platform_bus_type
);
1149 int __init
platform_bus_init(void)
1153 early_platform_cleanup();
1155 error
= device_register(&platform_bus
);
1158 error
= bus_register(&platform_bus_type
);
1160 device_unregister(&platform_bus
);
1161 of_platform_register_reconfig_notifier();
1165 #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1166 u64
dma_get_required_mask(struct device
*dev
)
1168 u32 low_totalram
= ((max_pfn
- 1) << PAGE_SHIFT
);
1169 u32 high_totalram
= ((max_pfn
- 1) >> (32 - PAGE_SHIFT
));
1172 if (!high_totalram
) {
1173 /* convert to mask just covering totalram */
1174 low_totalram
= (1 << (fls(low_totalram
) - 1));
1175 low_totalram
+= low_totalram
- 1;
1176 mask
= low_totalram
;
1178 high_totalram
= (1 << (fls(high_totalram
) - 1));
1179 high_totalram
+= high_totalram
- 1;
1180 mask
= (((u64
)high_totalram
) << 32) + 0xffffffff;
1184 EXPORT_SYMBOL_GPL(dma_get_required_mask
);
1187 static __initdata
LIST_HEAD(early_platform_driver_list
);
1188 static __initdata
LIST_HEAD(early_platform_device_list
);
1191 * early_platform_driver_register - register early platform driver
1192 * @epdrv: early_platform driver structure
1193 * @buf: string passed from early_param()
1195 * Helper function for early_platform_init() / early_platform_init_buffer()
1197 int __init
early_platform_driver_register(struct early_platform_driver
*epdrv
,
1203 /* Simply add the driver to the end of the global list.
1204 * Drivers will by default be put on the list in compiled-in order.
1206 if (!epdrv
->list
.next
) {
1207 INIT_LIST_HEAD(&epdrv
->list
);
1208 list_add_tail(&epdrv
->list
, &early_platform_driver_list
);
1211 /* If the user has specified device then make sure the driver
1212 * gets prioritized. The driver of the last device specified on
1213 * command line will be put first on the list.
1215 n
= strlen(epdrv
->pdrv
->driver
.name
);
1216 if (buf
&& !strncmp(buf
, epdrv
->pdrv
->driver
.name
, n
)) {
1217 list_move(&epdrv
->list
, &early_platform_driver_list
);
1219 /* Allow passing parameters after device name */
1220 if (buf
[n
] == '\0' || buf
[n
] == ',')
1221 epdrv
->requested_id
= -1;
1223 epdrv
->requested_id
= simple_strtoul(&buf
[n
+ 1],
1226 if (buf
[n
] != '.' || (tmp
== &buf
[n
+ 1])) {
1227 epdrv
->requested_id
= EARLY_PLATFORM_ID_ERROR
;
1230 n
+= strcspn(&buf
[n
+ 1], ",") + 1;
1236 if (epdrv
->bufsize
) {
1237 memcpy(epdrv
->buffer
, &buf
[n
],
1238 min_t(int, epdrv
->bufsize
, strlen(&buf
[n
]) + 1));
1239 epdrv
->buffer
[epdrv
->bufsize
- 1] = '\0';
1247 * early_platform_add_devices - adds a number of early platform devices
1248 * @devs: array of early platform devices to add
1249 * @num: number of early platform devices in array
1251 * Used by early architecture code to register early platform devices and
1252 * their platform data.
1254 void __init
early_platform_add_devices(struct platform_device
**devs
, int num
)
1259 /* simply add the devices to list */
1260 for (i
= 0; i
< num
; i
++) {
1261 dev
= &devs
[i
]->dev
;
1263 if (!dev
->devres_head
.next
) {
1264 pm_runtime_early_init(dev
);
1265 INIT_LIST_HEAD(&dev
->devres_head
);
1266 list_add_tail(&dev
->devres_head
,
1267 &early_platform_device_list
);
1273 * early_platform_driver_register_all - register early platform drivers
1274 * @class_str: string to identify early platform driver class
1276 * Used by architecture code to register all early platform drivers
1277 * for a certain class. If omitted then only early platform drivers
1278 * with matching kernel command line class parameters will be registered.
1280 void __init
early_platform_driver_register_all(char *class_str
)
1282 /* The "class_str" parameter may or may not be present on the kernel
1283 * command line. If it is present then there may be more than one
1284 * matching parameter.
1286 * Since we register our early platform drivers using early_param()
1287 * we need to make sure that they also get registered in the case
1288 * when the parameter is missing from the kernel command line.
1290 * We use parse_early_options() to make sure the early_param() gets
1291 * called at least once. The early_param() may be called more than
1292 * once since the name of the preferred device may be specified on
1293 * the kernel command line. early_platform_driver_register() handles
1296 parse_early_options(class_str
);
1300 * early_platform_match - find early platform device matching driver
1301 * @epdrv: early platform driver structure
1302 * @id: id to match against
1304 static struct platform_device
* __init
1305 early_platform_match(struct early_platform_driver
*epdrv
, int id
)
1307 struct platform_device
*pd
;
1309 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1310 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1318 * early_platform_left - check if early platform driver has matching devices
1319 * @epdrv: early platform driver structure
1320 * @id: return true if id or above exists
1322 static int __init
early_platform_left(struct early_platform_driver
*epdrv
,
1325 struct platform_device
*pd
;
1327 list_for_each_entry(pd
, &early_platform_device_list
, dev
.devres_head
)
1328 if (platform_match(&pd
->dev
, &epdrv
->pdrv
->driver
))
1336 * early_platform_driver_probe_id - probe drivers matching class_str and id
1337 * @class_str: string to identify early platform driver class
1338 * @id: id to match against
1339 * @nr_probe: number of platform devices to successfully probe before exiting
1341 static int __init
early_platform_driver_probe_id(char *class_str
,
1345 struct early_platform_driver
*epdrv
;
1346 struct platform_device
*match
;
1351 list_for_each_entry(epdrv
, &early_platform_driver_list
, list
) {
1352 /* only use drivers matching our class_str */
1353 if (strcmp(class_str
, epdrv
->class_str
))
1357 match_id
= epdrv
->requested_id
;
1362 left
+= early_platform_left(epdrv
, id
);
1364 /* skip requested id */
1365 switch (epdrv
->requested_id
) {
1366 case EARLY_PLATFORM_ID_ERROR
:
1367 case EARLY_PLATFORM_ID_UNSET
:
1370 if (epdrv
->requested_id
== id
)
1371 match_id
= EARLY_PLATFORM_ID_UNSET
;
1376 case EARLY_PLATFORM_ID_ERROR
:
1377 pr_warn("%s: unable to parse %s parameter\n",
1378 class_str
, epdrv
->pdrv
->driver
.name
);
1380 case EARLY_PLATFORM_ID_UNSET
:
1384 match
= early_platform_match(epdrv
, match_id
);
1389 * Set up a sensible init_name to enable
1390 * dev_name() and others to be used before the
1391 * rest of the driver core is initialized.
1393 if (!match
->dev
.init_name
&& slab_is_available()) {
1394 if (match
->id
!= -1)
1395 match
->dev
.init_name
=
1396 kasprintf(GFP_KERNEL
, "%s.%d",
1400 match
->dev
.init_name
=
1401 kasprintf(GFP_KERNEL
, "%s",
1404 if (!match
->dev
.init_name
)
1408 if (epdrv
->pdrv
->probe(match
))
1409 pr_warn("%s: unable to probe %s early.\n",
1410 class_str
, match
->name
);
1426 * early_platform_driver_probe - probe a class of registered drivers
1427 * @class_str: string to identify early platform driver class
1428 * @nr_probe: number of platform devices to successfully probe before exiting
1429 * @user_only: only probe user specified early platform devices
1431 * Used by architecture code to probe registered early platform drivers
1432 * within a certain class. For probe to happen a registered early platform
1433 * device matching a registered early platform driver is needed.
1435 int __init
early_platform_driver_probe(char *class_str
,
1442 for (i
= -2; n
< nr_probe
; i
++) {
1443 k
= early_platform_driver_probe_id(class_str
, i
, nr_probe
- n
);
1458 * early_platform_cleanup - clean up early platform code
1460 void __init
early_platform_cleanup(void)
1462 struct platform_device
*pd
, *pd2
;
1464 /* clean up the devres list used to chain devices */
1465 list_for_each_entry_safe(pd
, pd2
, &early_platform_device_list
,
1467 list_del(&pd
->dev
.devres_head
);
1468 memset(&pd
->dev
.devres_head
, 0, sizeof(pd
->dev
.devres_head
));