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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * platform.c - platform 'pseudo' bus for legacy devices
4 *
5 * Copyright (c) 2002-3 Patrick Mochel
6 * Copyright (c) 2002-3 Open Source Development Labs
7 *
8 * Please see Documentation/driver-api/driver-model/platform.rst for more
9 * information.
10 */
11
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/memblock.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>
29#include <linux/kmemleak.h>
30#include <linux/types.h>
31
32#include "base.h"
33#include "power/power.h"
34
35/* For automatically allocated device IDs */
36static DEFINE_IDA(platform_devid_ida);
37
38struct device platform_bus = {
39 .init_name = "platform",
40};
41EXPORT_SYMBOL_GPL(platform_bus);
42
43/**
44 * platform_get_resource - get a resource for a device
45 * @dev: platform device
46 * @type: resource type
47 * @num: resource index
48 */
49struct resource *platform_get_resource(struct platform_device *dev,
50 unsigned int type, unsigned int num)
51{
52 u32 i;
53
54 for (i = 0; i < dev->num_resources; i++) {
55 struct resource *r = &dev->resource[i];
56
57 if (type == resource_type(r) && num-- == 0)
58 return r;
59 }
60 return NULL;
61}
62EXPORT_SYMBOL_GPL(platform_get_resource);
63
64#ifdef CONFIG_HAS_IOMEM
65/**
66 * devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a
67 * platform device and get resource
68 *
69 * @pdev: platform device to use both for memory resource lookup as well as
70 * resource management
71 * @index: resource index
72 * @res: optional output parameter to store a pointer to the obtained resource.
73 */
74void __iomem *
75devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
76 unsigned int index, struct resource **res)
77{
78 struct resource *r;
79
80 r = platform_get_resource(pdev, IORESOURCE_MEM, index);
81 if (res)
82 *res = r;
83 return devm_ioremap_resource(&pdev->dev, r);
84}
85EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource);
86
87/**
88 * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
89 * device
90 *
91 * @pdev: platform device to use both for memory resource lookup as well as
92 * resource management
93 * @index: resource index
94 */
95void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
96 unsigned int index)
97{
98 return devm_platform_get_and_ioremap_resource(pdev, index, NULL);
99}
100EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
101
102/**
103 * devm_platform_ioremap_resource_wc - write-combined variant of
104 * devm_platform_ioremap_resource()
105 *
106 * @pdev: platform device to use both for memory resource lookup as well as
107 * resource management
108 * @index: resource index
109 */
110void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev,
111 unsigned int index)
112{
113 struct resource *res;
114
115 res = platform_get_resource(pdev, IORESOURCE_MEM, index);
116 return devm_ioremap_resource_wc(&pdev->dev, res);
117}
118
119/**
120 * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for
121 * a platform device, retrieve the
122 * resource by name
123 *
124 * @pdev: platform device to use both for memory resource lookup as well as
125 * resource management
126 * @name: name of the resource
127 */
128void __iomem *
129devm_platform_ioremap_resource_byname(struct platform_device *pdev,
130 const char *name)
131{
132 struct resource *res;
133
134 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
135 return devm_ioremap_resource(&pdev->dev, res);
136}
137EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
138#endif /* CONFIG_HAS_IOMEM */
139
140/**
141 * platform_get_irq_optional - get an optional IRQ for a device
142 * @dev: platform device
143 * @num: IRQ number index
144 *
145 * Gets an IRQ for a platform device. Device drivers should check the return
146 * value for errors so as to not pass a negative integer value to the
147 * request_irq() APIs. This is the same as platform_get_irq(), except that it
148 * does not print an error message if an IRQ can not be obtained.
149 *
150 * For example::
151 *
152 * int irq = platform_get_irq_optional(pdev, 0);
153 * if (irq < 0)
154 * return irq;
155 *
156 * Return: non-zero IRQ number on success, negative error number on failure.
157 */
158int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
159{
160 int ret;
161#ifdef CONFIG_SPARC
162 /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
163 if (!dev || num >= dev->archdata.num_irqs)
164 return -ENXIO;
165 ret = dev->archdata.irqs[num];
166 goto out;
167#else
168 struct resource *r;
169
170 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
171 ret = of_irq_get(dev->dev.of_node, num);
172 if (ret > 0 || ret == -EPROBE_DEFER)
173 goto out;
174 }
175
176 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
177 if (has_acpi_companion(&dev->dev)) {
178 if (r && r->flags & IORESOURCE_DISABLED) {
179 ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
180 if (ret)
181 goto out;
182 }
183 }
184
185 /*
186 * The resources may pass trigger flags to the irqs that need
187 * to be set up. It so happens that the trigger flags for
188 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
189 * settings.
190 */
191 if (r && r->flags & IORESOURCE_BITS) {
192 struct irq_data *irqd;
193
194 irqd = irq_get_irq_data(r->start);
195 if (!irqd) {
196 ret = -ENXIO;
197 goto out;
198 }
199 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
200 }
201
202 if (r) {
203 ret = r->start;
204 goto out;
205 }
206
207 /*
208 * For the index 0 interrupt, allow falling back to GpioInt
209 * resources. While a device could have both Interrupt and GpioInt
210 * resources, making this fallback ambiguous, in many common cases
211 * the device will only expose one IRQ, and this fallback
212 * allows a common code path across either kind of resource.
213 */
214 if (num == 0 && has_acpi_companion(&dev->dev)) {
215 ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
216 /* Our callers expect -ENXIO for missing IRQs. */
217 if (ret >= 0 || ret == -EPROBE_DEFER)
218 goto out;
219 }
220
221 ret = -ENXIO;
222#endif
223out:
224 WARN(ret == 0, "0 is an invalid IRQ number\n");
225 return ret;
226}
227EXPORT_SYMBOL_GPL(platform_get_irq_optional);
228
229/**
230 * platform_get_irq - get an IRQ for a device
231 * @dev: platform device
232 * @num: IRQ number index
233 *
234 * Gets an IRQ for a platform device and prints an error message if finding the
235 * IRQ fails. Device drivers should check the return value for errors so as to
236 * not pass a negative integer value to the request_irq() APIs.
237 *
238 * For example::
239 *
240 * int irq = platform_get_irq(pdev, 0);
241 * if (irq < 0)
242 * return irq;
243 *
244 * Return: non-zero IRQ number on success, negative error number on failure.
245 */
246int platform_get_irq(struct platform_device *dev, unsigned int num)
247{
248 int ret;
249
250 ret = platform_get_irq_optional(dev, num);
251 if (ret < 0 && ret != -EPROBE_DEFER)
252 dev_err(&dev->dev, "IRQ index %u not found\n", num);
253
254 return ret;
255}
256EXPORT_SYMBOL_GPL(platform_get_irq);
257
258/**
259 * platform_irq_count - Count the number of IRQs a platform device uses
260 * @dev: platform device
261 *
262 * Return: Number of IRQs a platform device uses or EPROBE_DEFER
263 */
264int platform_irq_count(struct platform_device *dev)
265{
266 int ret, nr = 0;
267
268 while ((ret = platform_get_irq_optional(dev, nr)) >= 0)
269 nr++;
270
271 if (ret == -EPROBE_DEFER)
272 return ret;
273
274 return nr;
275}
276EXPORT_SYMBOL_GPL(platform_irq_count);
277
278/**
279 * platform_get_resource_byname - get a resource for a device by name
280 * @dev: platform device
281 * @type: resource type
282 * @name: resource name
283 */
284struct resource *platform_get_resource_byname(struct platform_device *dev,
285 unsigned int type,
286 const char *name)
287{
288 u32 i;
289
290 for (i = 0; i < dev->num_resources; i++) {
291 struct resource *r = &dev->resource[i];
292
293 if (unlikely(!r->name))
294 continue;
295
296 if (type == resource_type(r) && !strcmp(r->name, name))
297 return r;
298 }
299 return NULL;
300}
301EXPORT_SYMBOL_GPL(platform_get_resource_byname);
302
303static int __platform_get_irq_byname(struct platform_device *dev,
304 const char *name)
305{
306 struct resource *r;
307 int ret;
308
309 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
310 ret = of_irq_get_byname(dev->dev.of_node, name);
311 if (ret > 0 || ret == -EPROBE_DEFER)
312 return ret;
313 }
314
315 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
316 if (r) {
317 WARN(r->start == 0, "0 is an invalid IRQ number\n");
318 return r->start;
319 }
320
321 return -ENXIO;
322}
323
324/**
325 * platform_get_irq_byname - get an IRQ for a device by name
326 * @dev: platform device
327 * @name: IRQ name
328 *
329 * Get an IRQ like platform_get_irq(), but then by name rather then by index.
330 *
331 * Return: non-zero IRQ number on success, negative error number on failure.
332 */
333int platform_get_irq_byname(struct platform_device *dev, const char *name)
334{
335 int ret;
336
337 ret = __platform_get_irq_byname(dev, name);
338 if (ret < 0 && ret != -EPROBE_DEFER)
339 dev_err(&dev->dev, "IRQ %s not found\n", name);
340
341 return ret;
342}
343EXPORT_SYMBOL_GPL(platform_get_irq_byname);
344
345/**
346 * platform_get_irq_byname_optional - get an optional IRQ for a device by name
347 * @dev: platform device
348 * @name: IRQ name
349 *
350 * Get an optional IRQ by name like platform_get_irq_byname(). Except that it
351 * does not print an error message if an IRQ can not be obtained.
352 *
353 * Return: non-zero IRQ number on success, negative error number on failure.
354 */
355int platform_get_irq_byname_optional(struct platform_device *dev,
356 const char *name)
357{
358 return __platform_get_irq_byname(dev, name);
359}
360EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional);
361
362/**
363 * platform_add_devices - add a numbers of platform devices
364 * @devs: array of platform devices to add
365 * @num: number of platform devices in array
366 */
367int platform_add_devices(struct platform_device **devs, int num)
368{
369 int i, ret = 0;
370
371 for (i = 0; i < num; i++) {
372 ret = platform_device_register(devs[i]);
373 if (ret) {
374 while (--i >= 0)
375 platform_device_unregister(devs[i]);
376 break;
377 }
378 }
379
380 return ret;
381}
382EXPORT_SYMBOL_GPL(platform_add_devices);
383
384struct platform_object {
385 struct platform_device pdev;
386 char name[];
387};
388
389/*
390 * Set up default DMA mask for platform devices if the they weren't
391 * previously set by the architecture / DT.
392 */
393static void setup_pdev_dma_masks(struct platform_device *pdev)
394{
395 pdev->dev.dma_parms = &pdev->dma_parms;
396
397 if (!pdev->dev.coherent_dma_mask)
398 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
399 if (!pdev->dev.dma_mask) {
400 pdev->platform_dma_mask = DMA_BIT_MASK(32);
401 pdev->dev.dma_mask = &pdev->platform_dma_mask;
402 }
403};
404
405/**
406 * platform_device_put - destroy a platform device
407 * @pdev: platform device to free
408 *
409 * Free all memory associated with a platform device. This function must
410 * _only_ be externally called in error cases. All other usage is a bug.
411 */
412void platform_device_put(struct platform_device *pdev)
413{
414 if (!IS_ERR_OR_NULL(pdev))
415 put_device(&pdev->dev);
416}
417EXPORT_SYMBOL_GPL(platform_device_put);
418
419static void platform_device_release(struct device *dev)
420{
421 struct platform_object *pa = container_of(dev, struct platform_object,
422 pdev.dev);
423
424 of_device_node_put(&pa->pdev.dev);
425 kfree(pa->pdev.dev.platform_data);
426 kfree(pa->pdev.mfd_cell);
427 kfree(pa->pdev.resource);
428 kfree(pa->pdev.driver_override);
429 kfree(pa);
430}
431
432/**
433 * platform_device_alloc - create a platform device
434 * @name: base name of the device we're adding
435 * @id: instance id
436 *
437 * Create a platform device object which can have other objects attached
438 * to it, and which will have attached objects freed when it is released.
439 */
440struct platform_device *platform_device_alloc(const char *name, int id)
441{
442 struct platform_object *pa;
443
444 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
445 if (pa) {
446 strcpy(pa->name, name);
447 pa->pdev.name = pa->name;
448 pa->pdev.id = id;
449 device_initialize(&pa->pdev.dev);
450 pa->pdev.dev.release = platform_device_release;
451 setup_pdev_dma_masks(&pa->pdev);
452 }
453
454 return pa ? &pa->pdev : NULL;
455}
456EXPORT_SYMBOL_GPL(platform_device_alloc);
457
458/**
459 * platform_device_add_resources - add resources to a platform device
460 * @pdev: platform device allocated by platform_device_alloc to add resources to
461 * @res: set of resources that needs to be allocated for the device
462 * @num: number of resources
463 *
464 * Add a copy of the resources to the platform device. The memory
465 * associated with the resources will be freed when the platform device is
466 * released.
467 */
468int platform_device_add_resources(struct platform_device *pdev,
469 const struct resource *res, unsigned int num)
470{
471 struct resource *r = NULL;
472
473 if (res) {
474 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
475 if (!r)
476 return -ENOMEM;
477 }
478
479 kfree(pdev->resource);
480 pdev->resource = r;
481 pdev->num_resources = num;
482 return 0;
483}
484EXPORT_SYMBOL_GPL(platform_device_add_resources);
485
486/**
487 * platform_device_add_data - add platform-specific data to a platform device
488 * @pdev: platform device allocated by platform_device_alloc to add resources to
489 * @data: platform specific data for this platform device
490 * @size: size of platform specific data
491 *
492 * Add a copy of platform specific data to the platform device's
493 * platform_data pointer. The memory associated with the platform data
494 * will be freed when the platform device is released.
495 */
496int platform_device_add_data(struct platform_device *pdev, const void *data,
497 size_t size)
498{
499 void *d = NULL;
500
501 if (data) {
502 d = kmemdup(data, size, GFP_KERNEL);
503 if (!d)
504 return -ENOMEM;
505 }
506
507 kfree(pdev->dev.platform_data);
508 pdev->dev.platform_data = d;
509 return 0;
510}
511EXPORT_SYMBOL_GPL(platform_device_add_data);
512
513/**
514 * platform_device_add_properties - add built-in properties to a platform device
515 * @pdev: platform device to add properties to
516 * @properties: null terminated array of properties to add
517 *
518 * The function will take deep copy of @properties and attach the copy to the
519 * platform device. The memory associated with properties will be freed when the
520 * platform device is released.
521 */
522int platform_device_add_properties(struct platform_device *pdev,
523 const struct property_entry *properties)
524{
525 return device_add_properties(&pdev->dev, properties);
526}
527EXPORT_SYMBOL_GPL(platform_device_add_properties);
528
529/**
530 * platform_device_add - add a platform device to device hierarchy
531 * @pdev: platform device we're adding
532 *
533 * This is part 2 of platform_device_register(), though may be called
534 * separately _iff_ pdev was allocated by platform_device_alloc().
535 */
536int platform_device_add(struct platform_device *pdev)
537{
538 u32 i;
539 int ret;
540
541 if (!pdev)
542 return -EINVAL;
543
544 if (!pdev->dev.parent)
545 pdev->dev.parent = &platform_bus;
546
547 pdev->dev.bus = &platform_bus_type;
548
549 switch (pdev->id) {
550 default:
551 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
552 break;
553 case PLATFORM_DEVID_NONE:
554 dev_set_name(&pdev->dev, "%s", pdev->name);
555 break;
556 case PLATFORM_DEVID_AUTO:
557 /*
558 * Automatically allocated device ID. We mark it as such so
559 * that we remember it must be freed, and we append a suffix
560 * to avoid namespace collision with explicit IDs.
561 */
562 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
563 if (ret < 0)
564 goto err_out;
565 pdev->id = ret;
566 pdev->id_auto = true;
567 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
568 break;
569 }
570
571 for (i = 0; i < pdev->num_resources; i++) {
572 struct resource *p, *r = &pdev->resource[i];
573
574 if (r->name == NULL)
575 r->name = dev_name(&pdev->dev);
576
577 p = r->parent;
578 if (!p) {
579 if (resource_type(r) == IORESOURCE_MEM)
580 p = &iomem_resource;
581 else if (resource_type(r) == IORESOURCE_IO)
582 p = &ioport_resource;
583 }
584
585 if (p) {
586 ret = insert_resource(p, r);
587 if (ret) {
588 dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
589 goto failed;
590 }
591 }
592 }
593
594 pr_debug("Registering platform device '%s'. Parent at %s\n",
595 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
596
597 ret = device_add(&pdev->dev);
598 if (ret == 0)
599 return ret;
600
601 failed:
602 if (pdev->id_auto) {
603 ida_simple_remove(&platform_devid_ida, pdev->id);
604 pdev->id = PLATFORM_DEVID_AUTO;
605 }
606
607 while (i--) {
608 struct resource *r = &pdev->resource[i];
609 if (r->parent)
610 release_resource(r);
611 }
612
613 err_out:
614 return ret;
615}
616EXPORT_SYMBOL_GPL(platform_device_add);
617
618/**
619 * platform_device_del - remove a platform-level device
620 * @pdev: platform device we're removing
621 *
622 * Note that this function will also release all memory- and port-based
623 * resources owned by the device (@dev->resource). This function must
624 * _only_ be externally called in error cases. All other usage is a bug.
625 */
626void platform_device_del(struct platform_device *pdev)
627{
628 u32 i;
629
630 if (!IS_ERR_OR_NULL(pdev)) {
631 device_del(&pdev->dev);
632
633 if (pdev->id_auto) {
634 ida_simple_remove(&platform_devid_ida, pdev->id);
635 pdev->id = PLATFORM_DEVID_AUTO;
636 }
637
638 for (i = 0; i < pdev->num_resources; i++) {
639 struct resource *r = &pdev->resource[i];
640 if (r->parent)
641 release_resource(r);
642 }
643 }
644}
645EXPORT_SYMBOL_GPL(platform_device_del);
646
647/**
648 * platform_device_register - add a platform-level device
649 * @pdev: platform device we're adding
650 */
651int platform_device_register(struct platform_device *pdev)
652{
653 device_initialize(&pdev->dev);
654 setup_pdev_dma_masks(pdev);
655 return platform_device_add(pdev);
656}
657EXPORT_SYMBOL_GPL(platform_device_register);
658
659/**
660 * platform_device_unregister - unregister a platform-level device
661 * @pdev: platform device we're unregistering
662 *
663 * Unregistration is done in 2 steps. First we release all resources
664 * and remove it from the subsystem, then we drop reference count by
665 * calling platform_device_put().
666 */
667void platform_device_unregister(struct platform_device *pdev)
668{
669 platform_device_del(pdev);
670 platform_device_put(pdev);
671}
672EXPORT_SYMBOL_GPL(platform_device_unregister);
673
674/**
675 * platform_device_register_full - add a platform-level device with
676 * resources and platform-specific data
677 *
678 * @pdevinfo: data used to create device
679 *
680 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
681 */
682struct platform_device *platform_device_register_full(
683 const struct platform_device_info *pdevinfo)
684{
685 int ret;
686 struct platform_device *pdev;
687
688 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
689 if (!pdev)
690 return ERR_PTR(-ENOMEM);
691
692 pdev->dev.parent = pdevinfo->parent;
693 pdev->dev.fwnode = pdevinfo->fwnode;
694 pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode));
695 pdev->dev.of_node_reused = pdevinfo->of_node_reused;
696
697 if (pdevinfo->dma_mask) {
698 pdev->platform_dma_mask = pdevinfo->dma_mask;
699 pdev->dev.dma_mask = &pdev->platform_dma_mask;
700 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
701 }
702
703 ret = platform_device_add_resources(pdev,
704 pdevinfo->res, pdevinfo->num_res);
705 if (ret)
706 goto err;
707
708 ret = platform_device_add_data(pdev,
709 pdevinfo->data, pdevinfo->size_data);
710 if (ret)
711 goto err;
712
713 if (pdevinfo->properties) {
714 ret = platform_device_add_properties(pdev,
715 pdevinfo->properties);
716 if (ret)
717 goto err;
718 }
719
720 ret = platform_device_add(pdev);
721 if (ret) {
722err:
723 ACPI_COMPANION_SET(&pdev->dev, NULL);
724 platform_device_put(pdev);
725 return ERR_PTR(ret);
726 }
727
728 return pdev;
729}
730EXPORT_SYMBOL_GPL(platform_device_register_full);
731
732static int platform_drv_probe(struct device *_dev)
733{
734 struct platform_driver *drv = to_platform_driver(_dev->driver);
735 struct platform_device *dev = to_platform_device(_dev);
736 int ret;
737
738 ret = of_clk_set_defaults(_dev->of_node, false);
739 if (ret < 0)
740 return ret;
741
742 ret = dev_pm_domain_attach(_dev, true);
743 if (ret)
744 goto out;
745
746 if (drv->probe) {
747 ret = drv->probe(dev);
748 if (ret)
749 dev_pm_domain_detach(_dev, true);
750 }
751
752out:
753 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
754 dev_warn(_dev, "probe deferral not supported\n");
755 ret = -ENXIO;
756 }
757
758 return ret;
759}
760
761static int platform_drv_probe_fail(struct device *_dev)
762{
763 return -ENXIO;
764}
765
766static int platform_drv_remove(struct device *_dev)
767{
768 struct platform_driver *drv = to_platform_driver(_dev->driver);
769 struct platform_device *dev = to_platform_device(_dev);
770 int ret = 0;
771
772 if (drv->remove)
773 ret = drv->remove(dev);
774 dev_pm_domain_detach(_dev, true);
775
776 return ret;
777}
778
779static void platform_drv_shutdown(struct device *_dev)
780{
781 struct platform_driver *drv = to_platform_driver(_dev->driver);
782 struct platform_device *dev = to_platform_device(_dev);
783
784 if (drv->shutdown)
785 drv->shutdown(dev);
786}
787
788/**
789 * __platform_driver_register - register a driver for platform-level devices
790 * @drv: platform driver structure
791 * @owner: owning module/driver
792 */
793int __platform_driver_register(struct platform_driver *drv,
794 struct module *owner)
795{
796 drv->driver.owner = owner;
797 drv->driver.bus = &platform_bus_type;
798 drv->driver.probe = platform_drv_probe;
799 drv->driver.remove = platform_drv_remove;
800 drv->driver.shutdown = platform_drv_shutdown;
801
802 return driver_register(&drv->driver);
803}
804EXPORT_SYMBOL_GPL(__platform_driver_register);
805
806/**
807 * platform_driver_unregister - unregister a driver for platform-level devices
808 * @drv: platform driver structure
809 */
810void platform_driver_unregister(struct platform_driver *drv)
811{
812 driver_unregister(&drv->driver);
813}
814EXPORT_SYMBOL_GPL(platform_driver_unregister);
815
816/**
817 * __platform_driver_probe - register driver for non-hotpluggable device
818 * @drv: platform driver structure
819 * @probe: the driver probe routine, probably from an __init section
820 * @module: module which will be the owner of the driver
821 *
822 * Use this instead of platform_driver_register() when you know the device
823 * is not hotpluggable and has already been registered, and you want to
824 * remove its run-once probe() infrastructure from memory after the driver
825 * has bound to the device.
826 *
827 * One typical use for this would be with drivers for controllers integrated
828 * into system-on-chip processors, where the controller devices have been
829 * configured as part of board setup.
830 *
831 * Note that this is incompatible with deferred probing.
832 *
833 * Returns zero if the driver registered and bound to a device, else returns
834 * a negative error code and with the driver not registered.
835 */
836int __init_or_module __platform_driver_probe(struct platform_driver *drv,
837 int (*probe)(struct platform_device *), struct module *module)
838{
839 int retval, code;
840
841 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
842 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
843 drv->driver.name, __func__);
844 return -EINVAL;
845 }
846
847 /*
848 * We have to run our probes synchronously because we check if
849 * we find any devices to bind to and exit with error if there
850 * are any.
851 */
852 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
853
854 /*
855 * Prevent driver from requesting probe deferral to avoid further
856 * futile probe attempts.
857 */
858 drv->prevent_deferred_probe = true;
859
860 /* make sure driver won't have bind/unbind attributes */
861 drv->driver.suppress_bind_attrs = true;
862
863 /* temporary section violation during probe() */
864 drv->probe = probe;
865 retval = code = __platform_driver_register(drv, module);
866 if (retval)
867 return retval;
868
869 /*
870 * Fixup that section violation, being paranoid about code scanning
871 * the list of drivers in order to probe new devices. Check to see
872 * if the probe was successful, and make sure any forced probes of
873 * new devices fail.
874 */
875 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
876 drv->probe = NULL;
877 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
878 retval = -ENODEV;
879 drv->driver.probe = platform_drv_probe_fail;
880 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
881
882 if (code != retval)
883 platform_driver_unregister(drv);
884 return retval;
885}
886EXPORT_SYMBOL_GPL(__platform_driver_probe);
887
888/**
889 * __platform_create_bundle - register driver and create corresponding device
890 * @driver: platform driver structure
891 * @probe: the driver probe routine, probably from an __init section
892 * @res: set of resources that needs to be allocated for the device
893 * @n_res: number of resources
894 * @data: platform specific data for this platform device
895 * @size: size of platform specific data
896 * @module: module which will be the owner of the driver
897 *
898 * Use this in legacy-style modules that probe hardware directly and
899 * register a single platform device and corresponding platform driver.
900 *
901 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
902 */
903struct platform_device * __init_or_module __platform_create_bundle(
904 struct platform_driver *driver,
905 int (*probe)(struct platform_device *),
906 struct resource *res, unsigned int n_res,
907 const void *data, size_t size, struct module *module)
908{
909 struct platform_device *pdev;
910 int error;
911
912 pdev = platform_device_alloc(driver->driver.name, -1);
913 if (!pdev) {
914 error = -ENOMEM;
915 goto err_out;
916 }
917
918 error = platform_device_add_resources(pdev, res, n_res);
919 if (error)
920 goto err_pdev_put;
921
922 error = platform_device_add_data(pdev, data, size);
923 if (error)
924 goto err_pdev_put;
925
926 error = platform_device_add(pdev);
927 if (error)
928 goto err_pdev_put;
929
930 error = __platform_driver_probe(driver, probe, module);
931 if (error)
932 goto err_pdev_del;
933
934 return pdev;
935
936err_pdev_del:
937 platform_device_del(pdev);
938err_pdev_put:
939 platform_device_put(pdev);
940err_out:
941 return ERR_PTR(error);
942}
943EXPORT_SYMBOL_GPL(__platform_create_bundle);
944
945/**
946 * __platform_register_drivers - register an array of platform drivers
947 * @drivers: an array of drivers to register
948 * @count: the number of drivers to register
949 * @owner: module owning the drivers
950 *
951 * Registers platform drivers specified by an array. On failure to register a
952 * driver, all previously registered drivers will be unregistered. Callers of
953 * this API should use platform_unregister_drivers() to unregister drivers in
954 * the reverse order.
955 *
956 * Returns: 0 on success or a negative error code on failure.
957 */
958int __platform_register_drivers(struct platform_driver * const *drivers,
959 unsigned int count, struct module *owner)
960{
961 unsigned int i;
962 int err;
963
964 for (i = 0; i < count; i++) {
965 pr_debug("registering platform driver %ps\n", drivers[i]);
966
967 err = __platform_driver_register(drivers[i], owner);
968 if (err < 0) {
969 pr_err("failed to register platform driver %ps: %d\n",
970 drivers[i], err);
971 goto error;
972 }
973 }
974
975 return 0;
976
977error:
978 while (i--) {
979 pr_debug("unregistering platform driver %ps\n", drivers[i]);
980 platform_driver_unregister(drivers[i]);
981 }
982
983 return err;
984}
985EXPORT_SYMBOL_GPL(__platform_register_drivers);
986
987/**
988 * platform_unregister_drivers - unregister an array of platform drivers
989 * @drivers: an array of drivers to unregister
990 * @count: the number of drivers to unregister
991 *
992 * Unregisters platform drivers specified by an array. This is typically used
993 * to complement an earlier call to platform_register_drivers(). Drivers are
994 * unregistered in the reverse order in which they were registered.
995 */
996void platform_unregister_drivers(struct platform_driver * const *drivers,
997 unsigned int count)
998{
999 while (count--) {
1000 pr_debug("unregistering platform driver %ps\n", drivers[count]);
1001 platform_driver_unregister(drivers[count]);
1002 }
1003}
1004EXPORT_SYMBOL_GPL(platform_unregister_drivers);
1005
1006/* modalias support enables more hands-off userspace setup:
1007 * (a) environment variable lets new-style hotplug events work once system is
1008 * fully running: "modprobe $MODALIAS"
1009 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
1010 * mishandled before system is fully running: "modprobe $(cat modalias)"
1011 */
1012static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
1013 char *buf)
1014{
1015 struct platform_device *pdev = to_platform_device(dev);
1016 int len;
1017
1018 len = of_device_modalias(dev, buf, PAGE_SIZE);
1019 if (len != -ENODEV)
1020 return len;
1021
1022 len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
1023 if (len != -ENODEV)
1024 return len;
1025
1026 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
1027
1028 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
1029}
1030static DEVICE_ATTR_RO(modalias);
1031
1032static ssize_t driver_override_store(struct device *dev,
1033 struct device_attribute *attr,
1034 const char *buf, size_t count)
1035{
1036 struct platform_device *pdev = to_platform_device(dev);
1037 char *driver_override, *old, *cp;
1038
1039 /* We need to keep extra room for a newline */
1040 if (count >= (PAGE_SIZE - 1))
1041 return -EINVAL;
1042
1043 driver_override = kstrndup(buf, count, GFP_KERNEL);
1044 if (!driver_override)
1045 return -ENOMEM;
1046
1047 cp = strchr(driver_override, '\n');
1048 if (cp)
1049 *cp = '\0';
1050
1051 device_lock(dev);
1052 old = pdev->driver_override;
1053 if (strlen(driver_override)) {
1054 pdev->driver_override = driver_override;
1055 } else {
1056 kfree(driver_override);
1057 pdev->driver_override = NULL;
1058 }
1059 device_unlock(dev);
1060
1061 kfree(old);
1062
1063 return count;
1064}
1065
1066static ssize_t driver_override_show(struct device *dev,
1067 struct device_attribute *attr, char *buf)
1068{
1069 struct platform_device *pdev = to_platform_device(dev);
1070 ssize_t len;
1071
1072 device_lock(dev);
1073 len = sprintf(buf, "%s\n", pdev->driver_override);
1074 device_unlock(dev);
1075 return len;
1076}
1077static DEVICE_ATTR_RW(driver_override);
1078
1079static ssize_t numa_node_show(struct device *dev,
1080 struct device_attribute *attr, char *buf)
1081{
1082 return sprintf(buf, "%d\n", dev_to_node(dev));
1083}
1084static DEVICE_ATTR_RO(numa_node);
1085
1086static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a,
1087 int n)
1088{
1089 struct device *dev = container_of(kobj, typeof(*dev), kobj);
1090
1091 if (a == &dev_attr_numa_node.attr &&
1092 dev_to_node(dev) == NUMA_NO_NODE)
1093 return 0;
1094
1095 return a->mode;
1096}
1097
1098static struct attribute *platform_dev_attrs[] = {
1099 &dev_attr_modalias.attr,
1100 &dev_attr_numa_node.attr,
1101 &dev_attr_driver_override.attr,
1102 NULL,
1103};
1104
1105static struct attribute_group platform_dev_group = {
1106 .attrs = platform_dev_attrs,
1107 .is_visible = platform_dev_attrs_visible,
1108};
1109__ATTRIBUTE_GROUPS(platform_dev);
1110
1111static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
1112{
1113 struct platform_device *pdev = to_platform_device(dev);
1114 int rc;
1115
1116 /* Some devices have extra OF data and an OF-style MODALIAS */
1117 rc = of_device_uevent_modalias(dev, env);
1118 if (rc != -ENODEV)
1119 return rc;
1120
1121 rc = acpi_device_uevent_modalias(dev, env);
1122 if (rc != -ENODEV)
1123 return rc;
1124
1125 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
1126 pdev->name);
1127 return 0;
1128}
1129
1130static const struct platform_device_id *platform_match_id(
1131 const struct platform_device_id *id,
1132 struct platform_device *pdev)
1133{
1134 while (id->name[0]) {
1135 if (strcmp(pdev->name, id->name) == 0) {
1136 pdev->id_entry = id;
1137 return id;
1138 }
1139 id++;
1140 }
1141 return NULL;
1142}
1143
1144/**
1145 * platform_match - bind platform device to platform driver.
1146 * @dev: device.
1147 * @drv: driver.
1148 *
1149 * Platform device IDs are assumed to be encoded like this:
1150 * "<name><instance>", where <name> is a short description of the type of
1151 * device, like "pci" or "floppy", and <instance> is the enumerated
1152 * instance of the device, like '0' or '42'. Driver IDs are simply
1153 * "<name>". So, extract the <name> from the platform_device structure,
1154 * and compare it against the name of the driver. Return whether they match
1155 * or not.
1156 */
1157static int platform_match(struct device *dev, struct device_driver *drv)
1158{
1159 struct platform_device *pdev = to_platform_device(dev);
1160 struct platform_driver *pdrv = to_platform_driver(drv);
1161
1162 /* When driver_override is set, only bind to the matching driver */
1163 if (pdev->driver_override)
1164 return !strcmp(pdev->driver_override, drv->name);
1165
1166 /* Attempt an OF style match first */
1167 if (of_driver_match_device(dev, drv))
1168 return 1;
1169
1170 /* Then try ACPI style match */
1171 if (acpi_driver_match_device(dev, drv))
1172 return 1;
1173
1174 /* Then try to match against the id table */
1175 if (pdrv->id_table)
1176 return platform_match_id(pdrv->id_table, pdev) != NULL;
1177
1178 /* fall-back to driver name match */
1179 return (strcmp(pdev->name, drv->name) == 0);
1180}
1181
1182#ifdef CONFIG_PM_SLEEP
1183
1184static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
1185{
1186 struct platform_driver *pdrv = to_platform_driver(dev->driver);
1187 struct platform_device *pdev = to_platform_device(dev);
1188 int ret = 0;
1189
1190 if (dev->driver && pdrv->suspend)
1191 ret = pdrv->suspend(pdev, mesg);
1192
1193 return ret;
1194}
1195
1196static int platform_legacy_resume(struct device *dev)
1197{
1198 struct platform_driver *pdrv = to_platform_driver(dev->driver);
1199 struct platform_device *pdev = to_platform_device(dev);
1200 int ret = 0;
1201
1202 if (dev->driver && pdrv->resume)
1203 ret = pdrv->resume(pdev);
1204
1205 return ret;
1206}
1207
1208#endif /* CONFIG_PM_SLEEP */
1209
1210#ifdef CONFIG_SUSPEND
1211
1212int platform_pm_suspend(struct device *dev)
1213{
1214 struct device_driver *drv = dev->driver;
1215 int ret = 0;
1216
1217 if (!drv)
1218 return 0;
1219
1220 if (drv->pm) {
1221 if (drv->pm->suspend)
1222 ret = drv->pm->suspend(dev);
1223 } else {
1224 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1225 }
1226
1227 return ret;
1228}
1229
1230int platform_pm_resume(struct device *dev)
1231{
1232 struct device_driver *drv = dev->driver;
1233 int ret = 0;
1234
1235 if (!drv)
1236 return 0;
1237
1238 if (drv->pm) {
1239 if (drv->pm->resume)
1240 ret = drv->pm->resume(dev);
1241 } else {
1242 ret = platform_legacy_resume(dev);
1243 }
1244
1245 return ret;
1246}
1247
1248#endif /* CONFIG_SUSPEND */
1249
1250#ifdef CONFIG_HIBERNATE_CALLBACKS
1251
1252int platform_pm_freeze(struct device *dev)
1253{
1254 struct device_driver *drv = dev->driver;
1255 int ret = 0;
1256
1257 if (!drv)
1258 return 0;
1259
1260 if (drv->pm) {
1261 if (drv->pm->freeze)
1262 ret = drv->pm->freeze(dev);
1263 } else {
1264 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1265 }
1266
1267 return ret;
1268}
1269
1270int platform_pm_thaw(struct device *dev)
1271{
1272 struct device_driver *drv = dev->driver;
1273 int ret = 0;
1274
1275 if (!drv)
1276 return 0;
1277
1278 if (drv->pm) {
1279 if (drv->pm->thaw)
1280 ret = drv->pm->thaw(dev);
1281 } else {
1282 ret = platform_legacy_resume(dev);
1283 }
1284
1285 return ret;
1286}
1287
1288int platform_pm_poweroff(struct device *dev)
1289{
1290 struct device_driver *drv = dev->driver;
1291 int ret = 0;
1292
1293 if (!drv)
1294 return 0;
1295
1296 if (drv->pm) {
1297 if (drv->pm->poweroff)
1298 ret = drv->pm->poweroff(dev);
1299 } else {
1300 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1301 }
1302
1303 return ret;
1304}
1305
1306int platform_pm_restore(struct device *dev)
1307{
1308 struct device_driver *drv = dev->driver;
1309 int ret = 0;
1310
1311 if (!drv)
1312 return 0;
1313
1314 if (drv->pm) {
1315 if (drv->pm->restore)
1316 ret = drv->pm->restore(dev);
1317 } else {
1318 ret = platform_legacy_resume(dev);
1319 }
1320
1321 return ret;
1322}
1323
1324#endif /* CONFIG_HIBERNATE_CALLBACKS */
1325
1326int platform_dma_configure(struct device *dev)
1327{
1328 enum dev_dma_attr attr;
1329 int ret = 0;
1330
1331 if (dev->of_node) {
1332 ret = of_dma_configure(dev, dev->of_node, true);
1333 } else if (has_acpi_companion(dev)) {
1334 attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
1335 ret = acpi_dma_configure(dev, attr);
1336 }
1337
1338 return ret;
1339}
1340
1341static const struct dev_pm_ops platform_dev_pm_ops = {
1342 .runtime_suspend = pm_generic_runtime_suspend,
1343 .runtime_resume = pm_generic_runtime_resume,
1344 USE_PLATFORM_PM_SLEEP_OPS
1345};
1346
1347struct bus_type platform_bus_type = {
1348 .name = "platform",
1349 .dev_groups = platform_dev_groups,
1350 .match = platform_match,
1351 .uevent = platform_uevent,
1352 .dma_configure = platform_dma_configure,
1353 .pm = &platform_dev_pm_ops,
1354};
1355EXPORT_SYMBOL_GPL(platform_bus_type);
1356
1357static inline int __platform_match(struct device *dev, const void *drv)
1358{
1359 return platform_match(dev, (struct device_driver *)drv);
1360}
1361
1362/**
1363 * platform_find_device_by_driver - Find a platform device with a given
1364 * driver.
1365 * @start: The device to start the search from.
1366 * @drv: The device driver to look for.
1367 */
1368struct device *platform_find_device_by_driver(struct device *start,
1369 const struct device_driver *drv)
1370{
1371 return bus_find_device(&platform_bus_type, start, drv,
1372 __platform_match);
1373}
1374EXPORT_SYMBOL_GPL(platform_find_device_by_driver);
1375
1376void __weak __init early_platform_cleanup(void) { }
1377
1378int __init platform_bus_init(void)
1379{
1380 int error;
1381
1382 early_platform_cleanup();
1383
1384 error = device_register(&platform_bus);
1385 if (error) {
1386 put_device(&platform_bus);
1387 return error;
1388 }
1389 error = bus_register(&platform_bus_type);
1390 if (error)
1391 device_unregister(&platform_bus);
1392 of_platform_register_reconfig_notifier();
1393 return error;
1394}
1/*
2 * platform.c - platform 'pseudo' bus for legacy devices
3 *
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
6 *
7 * This file is released under the GPLv2
8 *
9 * Please see Documentation/driver-model/platform.txt for more
10 * information.
11 */
12
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
24#include "base.h"
25
26#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
27 driver))
28
29struct device platform_bus = {
30 .init_name = "platform",
31};
32EXPORT_SYMBOL_GPL(platform_bus);
33
34/**
35 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
36 * @pdev: platform device
37 *
38 * This is called before platform_device_add() such that any pdev_archdata may
39 * be setup before the platform_notifier is called. So if a user needs to
40 * manipulate any relevant information in the pdev_archdata they can do:
41 *
42 * platform_devic_alloc()
43 * ... manipulate ...
44 * platform_device_add()
45 *
46 * And if they don't care they can just call platform_device_register() and
47 * everything will just work out.
48 */
49void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
50{
51}
52
53/**
54 * platform_get_resource - get a resource for a device
55 * @dev: platform device
56 * @type: resource type
57 * @num: resource index
58 */
59struct resource *platform_get_resource(struct platform_device *dev,
60 unsigned int type, unsigned int num)
61{
62 int i;
63
64 for (i = 0; i < dev->num_resources; i++) {
65 struct resource *r = &dev->resource[i];
66
67 if (type == resource_type(r) && num-- == 0)
68 return r;
69 }
70 return NULL;
71}
72EXPORT_SYMBOL_GPL(platform_get_resource);
73
74/**
75 * platform_get_irq - get an IRQ for a device
76 * @dev: platform device
77 * @num: IRQ number index
78 */
79int platform_get_irq(struct platform_device *dev, unsigned int num)
80{
81 struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
82
83 return r ? r->start : -ENXIO;
84}
85EXPORT_SYMBOL_GPL(platform_get_irq);
86
87/**
88 * platform_get_resource_byname - get a resource for a device by name
89 * @dev: platform device
90 * @type: resource type
91 * @name: resource name
92 */
93struct resource *platform_get_resource_byname(struct platform_device *dev,
94 unsigned int type,
95 const char *name)
96{
97 int i;
98
99 for (i = 0; i < dev->num_resources; i++) {
100 struct resource *r = &dev->resource[i];
101
102 if (type == resource_type(r) && !strcmp(r->name, name))
103 return r;
104 }
105 return NULL;
106}
107EXPORT_SYMBOL_GPL(platform_get_resource_byname);
108
109/**
110 * platform_get_irq - get an IRQ for a device
111 * @dev: platform device
112 * @name: IRQ name
113 */
114int platform_get_irq_byname(struct platform_device *dev, const char *name)
115{
116 struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
117 name);
118
119 return r ? r->start : -ENXIO;
120}
121EXPORT_SYMBOL_GPL(platform_get_irq_byname);
122
123/**
124 * platform_add_devices - add a numbers of platform devices
125 * @devs: array of platform devices to add
126 * @num: number of platform devices in array
127 */
128int platform_add_devices(struct platform_device **devs, int num)
129{
130 int i, ret = 0;
131
132 for (i = 0; i < num; i++) {
133 ret = platform_device_register(devs[i]);
134 if (ret) {
135 while (--i >= 0)
136 platform_device_unregister(devs[i]);
137 break;
138 }
139 }
140
141 return ret;
142}
143EXPORT_SYMBOL_GPL(platform_add_devices);
144
145struct platform_object {
146 struct platform_device pdev;
147 char name[1];
148};
149
150/**
151 * platform_device_put - destroy a platform device
152 * @pdev: platform device to free
153 *
154 * Free all memory associated with a platform device. This function must
155 * _only_ be externally called in error cases. All other usage is a bug.
156 */
157void platform_device_put(struct platform_device *pdev)
158{
159 if (pdev)
160 put_device(&pdev->dev);
161}
162EXPORT_SYMBOL_GPL(platform_device_put);
163
164static void platform_device_release(struct device *dev)
165{
166 struct platform_object *pa = container_of(dev, struct platform_object,
167 pdev.dev);
168
169 of_device_node_put(&pa->pdev.dev);
170 kfree(pa->pdev.dev.platform_data);
171 kfree(pa->pdev.mfd_cell);
172 kfree(pa->pdev.resource);
173 kfree(pa);
174}
175
176/**
177 * platform_device_alloc - create a platform device
178 * @name: base name of the device we're adding
179 * @id: instance id
180 *
181 * Create a platform device object which can have other objects attached
182 * to it, and which will have attached objects freed when it is released.
183 */
184struct platform_device *platform_device_alloc(const char *name, int id)
185{
186 struct platform_object *pa;
187
188 pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
189 if (pa) {
190 strcpy(pa->name, name);
191 pa->pdev.name = pa->name;
192 pa->pdev.id = id;
193 device_initialize(&pa->pdev.dev);
194 pa->pdev.dev.release = platform_device_release;
195 arch_setup_pdev_archdata(&pa->pdev);
196 }
197
198 return pa ? &pa->pdev : NULL;
199}
200EXPORT_SYMBOL_GPL(platform_device_alloc);
201
202/**
203 * platform_device_add_resources - add resources to a platform device
204 * @pdev: platform device allocated by platform_device_alloc to add resources to
205 * @res: set of resources that needs to be allocated for the device
206 * @num: number of resources
207 *
208 * Add a copy of the resources to the platform device. The memory
209 * associated with the resources will be freed when the platform device is
210 * released.
211 */
212int platform_device_add_resources(struct platform_device *pdev,
213 const struct resource *res, unsigned int num)
214{
215 struct resource *r = NULL;
216
217 if (res) {
218 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
219 if (!r)
220 return -ENOMEM;
221 }
222
223 kfree(pdev->resource);
224 pdev->resource = r;
225 pdev->num_resources = num;
226 return 0;
227}
228EXPORT_SYMBOL_GPL(platform_device_add_resources);
229
230/**
231 * platform_device_add_data - add platform-specific data to a platform device
232 * @pdev: platform device allocated by platform_device_alloc to add resources to
233 * @data: platform specific data for this platform device
234 * @size: size of platform specific data
235 *
236 * Add a copy of platform specific data to the platform device's
237 * platform_data pointer. The memory associated with the platform data
238 * will be freed when the platform device is released.
239 */
240int platform_device_add_data(struct platform_device *pdev, const void *data,
241 size_t size)
242{
243 void *d = NULL;
244
245 if (data) {
246 d = kmemdup(data, size, GFP_KERNEL);
247 if (!d)
248 return -ENOMEM;
249 }
250
251 kfree(pdev->dev.platform_data);
252 pdev->dev.platform_data = d;
253 return 0;
254}
255EXPORT_SYMBOL_GPL(platform_device_add_data);
256
257/**
258 * platform_device_add - add a platform device to device hierarchy
259 * @pdev: platform device we're adding
260 *
261 * This is part 2 of platform_device_register(), though may be called
262 * separately _iff_ pdev was allocated by platform_device_alloc().
263 */
264int platform_device_add(struct platform_device *pdev)
265{
266 int i, ret = 0;
267
268 if (!pdev)
269 return -EINVAL;
270
271 if (!pdev->dev.parent)
272 pdev->dev.parent = &platform_bus;
273
274 pdev->dev.bus = &platform_bus_type;
275
276 if (pdev->id != -1)
277 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
278 else
279 dev_set_name(&pdev->dev, "%s", pdev->name);
280
281 for (i = 0; i < pdev->num_resources; i++) {
282 struct resource *p, *r = &pdev->resource[i];
283
284 if (r->name == NULL)
285 r->name = dev_name(&pdev->dev);
286
287 p = r->parent;
288 if (!p) {
289 if (resource_type(r) == IORESOURCE_MEM)
290 p = &iomem_resource;
291 else if (resource_type(r) == IORESOURCE_IO)
292 p = &ioport_resource;
293 }
294
295 if (p && insert_resource(p, r)) {
296 printk(KERN_ERR
297 "%s: failed to claim resource %d\n",
298 dev_name(&pdev->dev), i);
299 ret = -EBUSY;
300 goto failed;
301 }
302 }
303
304 pr_debug("Registering platform device '%s'. Parent at %s\n",
305 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
306
307 ret = device_add(&pdev->dev);
308 if (ret == 0)
309 return ret;
310
311 failed:
312 while (--i >= 0) {
313 struct resource *r = &pdev->resource[i];
314 unsigned long type = resource_type(r);
315
316 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
317 release_resource(r);
318 }
319
320 return ret;
321}
322EXPORT_SYMBOL_GPL(platform_device_add);
323
324/**
325 * platform_device_del - remove a platform-level device
326 * @pdev: platform device we're removing
327 *
328 * Note that this function will also release all memory- and port-based
329 * resources owned by the device (@dev->resource). This function must
330 * _only_ be externally called in error cases. All other usage is a bug.
331 */
332void platform_device_del(struct platform_device *pdev)
333{
334 int i;
335
336 if (pdev) {
337 device_del(&pdev->dev);
338
339 for (i = 0; i < pdev->num_resources; i++) {
340 struct resource *r = &pdev->resource[i];
341 unsigned long type = resource_type(r);
342
343 if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
344 release_resource(r);
345 }
346 }
347}
348EXPORT_SYMBOL_GPL(platform_device_del);
349
350/**
351 * platform_device_register - add a platform-level device
352 * @pdev: platform device we're adding
353 */
354int platform_device_register(struct platform_device *pdev)
355{
356 device_initialize(&pdev->dev);
357 arch_setup_pdev_archdata(pdev);
358 return platform_device_add(pdev);
359}
360EXPORT_SYMBOL_GPL(platform_device_register);
361
362/**
363 * platform_device_unregister - unregister a platform-level device
364 * @pdev: platform device we're unregistering
365 *
366 * Unregistration is done in 2 steps. First we release all resources
367 * and remove it from the subsystem, then we drop reference count by
368 * calling platform_device_put().
369 */
370void platform_device_unregister(struct platform_device *pdev)
371{
372 platform_device_del(pdev);
373 platform_device_put(pdev);
374}
375EXPORT_SYMBOL_GPL(platform_device_unregister);
376
377/**
378 * platform_device_register_full - add a platform-level device with
379 * resources and platform-specific data
380 *
381 * @pdevinfo: data used to create device
382 *
383 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
384 */
385struct platform_device *platform_device_register_full(
386 const struct platform_device_info *pdevinfo)
387{
388 int ret = -ENOMEM;
389 struct platform_device *pdev;
390
391 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
392 if (!pdev)
393 goto err_alloc;
394
395 pdev->dev.parent = pdevinfo->parent;
396
397 if (pdevinfo->dma_mask) {
398 /*
399 * This memory isn't freed when the device is put,
400 * I don't have a nice idea for that though. Conceptually
401 * dma_mask in struct device should not be a pointer.
402 * See http://thread.gmane.org/gmane.linux.kernel.pci/9081
403 */
404 pdev->dev.dma_mask =
405 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
406 if (!pdev->dev.dma_mask)
407 goto err;
408
409 *pdev->dev.dma_mask = pdevinfo->dma_mask;
410 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
411 }
412
413 ret = platform_device_add_resources(pdev,
414 pdevinfo->res, pdevinfo->num_res);
415 if (ret)
416 goto err;
417
418 ret = platform_device_add_data(pdev,
419 pdevinfo->data, pdevinfo->size_data);
420 if (ret)
421 goto err;
422
423 ret = platform_device_add(pdev);
424 if (ret) {
425err:
426 kfree(pdev->dev.dma_mask);
427
428err_alloc:
429 platform_device_put(pdev);
430 return ERR_PTR(ret);
431 }
432
433 return pdev;
434}
435EXPORT_SYMBOL_GPL(platform_device_register_full);
436
437static int platform_drv_probe(struct device *_dev)
438{
439 struct platform_driver *drv = to_platform_driver(_dev->driver);
440 struct platform_device *dev = to_platform_device(_dev);
441
442 return drv->probe(dev);
443}
444
445static int platform_drv_probe_fail(struct device *_dev)
446{
447 return -ENXIO;
448}
449
450static int platform_drv_remove(struct device *_dev)
451{
452 struct platform_driver *drv = to_platform_driver(_dev->driver);
453 struct platform_device *dev = to_platform_device(_dev);
454
455 return drv->remove(dev);
456}
457
458static void platform_drv_shutdown(struct device *_dev)
459{
460 struct platform_driver *drv = to_platform_driver(_dev->driver);
461 struct platform_device *dev = to_platform_device(_dev);
462
463 drv->shutdown(dev);
464}
465
466/**
467 * platform_driver_register - register a driver for platform-level devices
468 * @drv: platform driver structure
469 */
470int platform_driver_register(struct platform_driver *drv)
471{
472 drv->driver.bus = &platform_bus_type;
473 if (drv->probe)
474 drv->driver.probe = platform_drv_probe;
475 if (drv->remove)
476 drv->driver.remove = platform_drv_remove;
477 if (drv->shutdown)
478 drv->driver.shutdown = platform_drv_shutdown;
479
480 return driver_register(&drv->driver);
481}
482EXPORT_SYMBOL_GPL(platform_driver_register);
483
484/**
485 * platform_driver_unregister - unregister a driver for platform-level devices
486 * @drv: platform driver structure
487 */
488void platform_driver_unregister(struct platform_driver *drv)
489{
490 driver_unregister(&drv->driver);
491}
492EXPORT_SYMBOL_GPL(platform_driver_unregister);
493
494/**
495 * platform_driver_probe - register driver for non-hotpluggable device
496 * @drv: platform driver structure
497 * @probe: the driver probe routine, probably from an __init section
498 *
499 * Use this instead of platform_driver_register() when you know the device
500 * is not hotpluggable and has already been registered, and you want to
501 * remove its run-once probe() infrastructure from memory after the driver
502 * has bound to the device.
503 *
504 * One typical use for this would be with drivers for controllers integrated
505 * into system-on-chip processors, where the controller devices have been
506 * configured as part of board setup.
507 *
508 * Returns zero if the driver registered and bound to a device, else returns
509 * a negative error code and with the driver not registered.
510 */
511int __init_or_module platform_driver_probe(struct platform_driver *drv,
512 int (*probe)(struct platform_device *))
513{
514 int retval, code;
515
516 /* make sure driver won't have bind/unbind attributes */
517 drv->driver.suppress_bind_attrs = true;
518
519 /* temporary section violation during probe() */
520 drv->probe = probe;
521 retval = code = platform_driver_register(drv);
522
523 /*
524 * Fixup that section violation, being paranoid about code scanning
525 * the list of drivers in order to probe new devices. Check to see
526 * if the probe was successful, and make sure any forced probes of
527 * new devices fail.
528 */
529 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
530 drv->probe = NULL;
531 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
532 retval = -ENODEV;
533 drv->driver.probe = platform_drv_probe_fail;
534 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
535
536 if (code != retval)
537 platform_driver_unregister(drv);
538 return retval;
539}
540EXPORT_SYMBOL_GPL(platform_driver_probe);
541
542/**
543 * platform_create_bundle - register driver and create corresponding device
544 * @driver: platform driver structure
545 * @probe: the driver probe routine, probably from an __init section
546 * @res: set of resources that needs to be allocated for the device
547 * @n_res: number of resources
548 * @data: platform specific data for this platform device
549 * @size: size of platform specific data
550 *
551 * Use this in legacy-style modules that probe hardware directly and
552 * register a single platform device and corresponding platform driver.
553 *
554 * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
555 */
556struct platform_device * __init_or_module platform_create_bundle(
557 struct platform_driver *driver,
558 int (*probe)(struct platform_device *),
559 struct resource *res, unsigned int n_res,
560 const void *data, size_t size)
561{
562 struct platform_device *pdev;
563 int error;
564
565 pdev = platform_device_alloc(driver->driver.name, -1);
566 if (!pdev) {
567 error = -ENOMEM;
568 goto err_out;
569 }
570
571 error = platform_device_add_resources(pdev, res, n_res);
572 if (error)
573 goto err_pdev_put;
574
575 error = platform_device_add_data(pdev, data, size);
576 if (error)
577 goto err_pdev_put;
578
579 error = platform_device_add(pdev);
580 if (error)
581 goto err_pdev_put;
582
583 error = platform_driver_probe(driver, probe);
584 if (error)
585 goto err_pdev_del;
586
587 return pdev;
588
589err_pdev_del:
590 platform_device_del(pdev);
591err_pdev_put:
592 platform_device_put(pdev);
593err_out:
594 return ERR_PTR(error);
595}
596EXPORT_SYMBOL_GPL(platform_create_bundle);
597
598/* modalias support enables more hands-off userspace setup:
599 * (a) environment variable lets new-style hotplug events work once system is
600 * fully running: "modprobe $MODALIAS"
601 * (b) sysfs attribute lets new-style coldplug recover from hotplug events
602 * mishandled before system is fully running: "modprobe $(cat modalias)"
603 */
604static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
605 char *buf)
606{
607 struct platform_device *pdev = to_platform_device(dev);
608 int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
609
610 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
611}
612
613static struct device_attribute platform_dev_attrs[] = {
614 __ATTR_RO(modalias),
615 __ATTR_NULL,
616};
617
618static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
619{
620 struct platform_device *pdev = to_platform_device(dev);
621 int rc;
622
623 /* Some devices have extra OF data and an OF-style MODALIAS */
624 rc = of_device_uevent_modalias(dev,env);
625 if (rc != -ENODEV)
626 return rc;
627
628 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
629 pdev->name);
630 return 0;
631}
632
633static const struct platform_device_id *platform_match_id(
634 const struct platform_device_id *id,
635 struct platform_device *pdev)
636{
637 while (id->name[0]) {
638 if (strcmp(pdev->name, id->name) == 0) {
639 pdev->id_entry = id;
640 return id;
641 }
642 id++;
643 }
644 return NULL;
645}
646
647/**
648 * platform_match - bind platform device to platform driver.
649 * @dev: device.
650 * @drv: driver.
651 *
652 * Platform device IDs are assumed to be encoded like this:
653 * "<name><instance>", where <name> is a short description of the type of
654 * device, like "pci" or "floppy", and <instance> is the enumerated
655 * instance of the device, like '0' or '42'. Driver IDs are simply
656 * "<name>". So, extract the <name> from the platform_device structure,
657 * and compare it against the name of the driver. Return whether they match
658 * or not.
659 */
660static int platform_match(struct device *dev, struct device_driver *drv)
661{
662 struct platform_device *pdev = to_platform_device(dev);
663 struct platform_driver *pdrv = to_platform_driver(drv);
664
665 /* Attempt an OF style match first */
666 if (of_driver_match_device(dev, drv))
667 return 1;
668
669 /* Then try to match against the id table */
670 if (pdrv->id_table)
671 return platform_match_id(pdrv->id_table, pdev) != NULL;
672
673 /* fall-back to driver name match */
674 return (strcmp(pdev->name, drv->name) == 0);
675}
676
677#ifdef CONFIG_PM_SLEEP
678
679static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
680{
681 struct platform_driver *pdrv = to_platform_driver(dev->driver);
682 struct platform_device *pdev = to_platform_device(dev);
683 int ret = 0;
684
685 if (dev->driver && pdrv->suspend)
686 ret = pdrv->suspend(pdev, mesg);
687
688 return ret;
689}
690
691static int platform_legacy_resume(struct device *dev)
692{
693 struct platform_driver *pdrv = to_platform_driver(dev->driver);
694 struct platform_device *pdev = to_platform_device(dev);
695 int ret = 0;
696
697 if (dev->driver && pdrv->resume)
698 ret = pdrv->resume(pdev);
699
700 return ret;
701}
702
703#endif /* CONFIG_PM_SLEEP */
704
705#ifdef CONFIG_SUSPEND
706
707int platform_pm_suspend(struct device *dev)
708{
709 struct device_driver *drv = dev->driver;
710 int ret = 0;
711
712 if (!drv)
713 return 0;
714
715 if (drv->pm) {
716 if (drv->pm->suspend)
717 ret = drv->pm->suspend(dev);
718 } else {
719 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
720 }
721
722 return ret;
723}
724
725int platform_pm_resume(struct device *dev)
726{
727 struct device_driver *drv = dev->driver;
728 int ret = 0;
729
730 if (!drv)
731 return 0;
732
733 if (drv->pm) {
734 if (drv->pm->resume)
735 ret = drv->pm->resume(dev);
736 } else {
737 ret = platform_legacy_resume(dev);
738 }
739
740 return ret;
741}
742
743#endif /* CONFIG_SUSPEND */
744
745#ifdef CONFIG_HIBERNATE_CALLBACKS
746
747int platform_pm_freeze(struct device *dev)
748{
749 struct device_driver *drv = dev->driver;
750 int ret = 0;
751
752 if (!drv)
753 return 0;
754
755 if (drv->pm) {
756 if (drv->pm->freeze)
757 ret = drv->pm->freeze(dev);
758 } else {
759 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
760 }
761
762 return ret;
763}
764
765int platform_pm_thaw(struct device *dev)
766{
767 struct device_driver *drv = dev->driver;
768 int ret = 0;
769
770 if (!drv)
771 return 0;
772
773 if (drv->pm) {
774 if (drv->pm->thaw)
775 ret = drv->pm->thaw(dev);
776 } else {
777 ret = platform_legacy_resume(dev);
778 }
779
780 return ret;
781}
782
783int platform_pm_poweroff(struct device *dev)
784{
785 struct device_driver *drv = dev->driver;
786 int ret = 0;
787
788 if (!drv)
789 return 0;
790
791 if (drv->pm) {
792 if (drv->pm->poweroff)
793 ret = drv->pm->poweroff(dev);
794 } else {
795 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
796 }
797
798 return ret;
799}
800
801int platform_pm_restore(struct device *dev)
802{
803 struct device_driver *drv = dev->driver;
804 int ret = 0;
805
806 if (!drv)
807 return 0;
808
809 if (drv->pm) {
810 if (drv->pm->restore)
811 ret = drv->pm->restore(dev);
812 } else {
813 ret = platform_legacy_resume(dev);
814 }
815
816 return ret;
817}
818
819#endif /* CONFIG_HIBERNATE_CALLBACKS */
820
821static const struct dev_pm_ops platform_dev_pm_ops = {
822 .runtime_suspend = pm_generic_runtime_suspend,
823 .runtime_resume = pm_generic_runtime_resume,
824 .runtime_idle = pm_generic_runtime_idle,
825 USE_PLATFORM_PM_SLEEP_OPS
826};
827
828struct bus_type platform_bus_type = {
829 .name = "platform",
830 .dev_attrs = platform_dev_attrs,
831 .match = platform_match,
832 .uevent = platform_uevent,
833 .pm = &platform_dev_pm_ops,
834};
835EXPORT_SYMBOL_GPL(platform_bus_type);
836
837int __init platform_bus_init(void)
838{
839 int error;
840
841 early_platform_cleanup();
842
843 error = device_register(&platform_bus);
844 if (error)
845 return error;
846 error = bus_register(&platform_bus_type);
847 if (error)
848 device_unregister(&platform_bus);
849 return error;
850}
851
852#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
853u64 dma_get_required_mask(struct device *dev)
854{
855 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
856 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
857 u64 mask;
858
859 if (!high_totalram) {
860 /* convert to mask just covering totalram */
861 low_totalram = (1 << (fls(low_totalram) - 1));
862 low_totalram += low_totalram - 1;
863 mask = low_totalram;
864 } else {
865 high_totalram = (1 << (fls(high_totalram) - 1));
866 high_totalram += high_totalram - 1;
867 mask = (((u64)high_totalram) << 32) + 0xffffffff;
868 }
869 return mask;
870}
871EXPORT_SYMBOL_GPL(dma_get_required_mask);
872#endif
873
874static __initdata LIST_HEAD(early_platform_driver_list);
875static __initdata LIST_HEAD(early_platform_device_list);
876
877/**
878 * early_platform_driver_register - register early platform driver
879 * @epdrv: early_platform driver structure
880 * @buf: string passed from early_param()
881 *
882 * Helper function for early_platform_init() / early_platform_init_buffer()
883 */
884int __init early_platform_driver_register(struct early_platform_driver *epdrv,
885 char *buf)
886{
887 char *tmp;
888 int n;
889
890 /* Simply add the driver to the end of the global list.
891 * Drivers will by default be put on the list in compiled-in order.
892 */
893 if (!epdrv->list.next) {
894 INIT_LIST_HEAD(&epdrv->list);
895 list_add_tail(&epdrv->list, &early_platform_driver_list);
896 }
897
898 /* If the user has specified device then make sure the driver
899 * gets prioritized. The driver of the last device specified on
900 * command line will be put first on the list.
901 */
902 n = strlen(epdrv->pdrv->driver.name);
903 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
904 list_move(&epdrv->list, &early_platform_driver_list);
905
906 /* Allow passing parameters after device name */
907 if (buf[n] == '\0' || buf[n] == ',')
908 epdrv->requested_id = -1;
909 else {
910 epdrv->requested_id = simple_strtoul(&buf[n + 1],
911 &tmp, 10);
912
913 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
914 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
915 n = 0;
916 } else
917 n += strcspn(&buf[n + 1], ",") + 1;
918 }
919
920 if (buf[n] == ',')
921 n++;
922
923 if (epdrv->bufsize) {
924 memcpy(epdrv->buffer, &buf[n],
925 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
926 epdrv->buffer[epdrv->bufsize - 1] = '\0';
927 }
928 }
929
930 return 0;
931}
932
933/**
934 * early_platform_add_devices - adds a number of early platform devices
935 * @devs: array of early platform devices to add
936 * @num: number of early platform devices in array
937 *
938 * Used by early architecture code to register early platform devices and
939 * their platform data.
940 */
941void __init early_platform_add_devices(struct platform_device **devs, int num)
942{
943 struct device *dev;
944 int i;
945
946 /* simply add the devices to list */
947 for (i = 0; i < num; i++) {
948 dev = &devs[i]->dev;
949
950 if (!dev->devres_head.next) {
951 INIT_LIST_HEAD(&dev->devres_head);
952 list_add_tail(&dev->devres_head,
953 &early_platform_device_list);
954 }
955 }
956}
957
958/**
959 * early_platform_driver_register_all - register early platform drivers
960 * @class_str: string to identify early platform driver class
961 *
962 * Used by architecture code to register all early platform drivers
963 * for a certain class. If omitted then only early platform drivers
964 * with matching kernel command line class parameters will be registered.
965 */
966void __init early_platform_driver_register_all(char *class_str)
967{
968 /* The "class_str" parameter may or may not be present on the kernel
969 * command line. If it is present then there may be more than one
970 * matching parameter.
971 *
972 * Since we register our early platform drivers using early_param()
973 * we need to make sure that they also get registered in the case
974 * when the parameter is missing from the kernel command line.
975 *
976 * We use parse_early_options() to make sure the early_param() gets
977 * called at least once. The early_param() may be called more than
978 * once since the name of the preferred device may be specified on
979 * the kernel command line. early_platform_driver_register() handles
980 * this case for us.
981 */
982 parse_early_options(class_str);
983}
984
985/**
986 * early_platform_match - find early platform device matching driver
987 * @epdrv: early platform driver structure
988 * @id: id to match against
989 */
990static __init struct platform_device *
991early_platform_match(struct early_platform_driver *epdrv, int id)
992{
993 struct platform_device *pd;
994
995 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
996 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
997 if (pd->id == id)
998 return pd;
999
1000 return NULL;
1001}
1002
1003/**
1004 * early_platform_left - check if early platform driver has matching devices
1005 * @epdrv: early platform driver structure
1006 * @id: return true if id or above exists
1007 */
1008static __init int early_platform_left(struct early_platform_driver *epdrv,
1009 int id)
1010{
1011 struct platform_device *pd;
1012
1013 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1014 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1015 if (pd->id >= id)
1016 return 1;
1017
1018 return 0;
1019}
1020
1021/**
1022 * early_platform_driver_probe_id - probe drivers matching class_str and id
1023 * @class_str: string to identify early platform driver class
1024 * @id: id to match against
1025 * @nr_probe: number of platform devices to successfully probe before exiting
1026 */
1027static int __init early_platform_driver_probe_id(char *class_str,
1028 int id,
1029 int nr_probe)
1030{
1031 struct early_platform_driver *epdrv;
1032 struct platform_device *match;
1033 int match_id;
1034 int n = 0;
1035 int left = 0;
1036
1037 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1038 /* only use drivers matching our class_str */
1039 if (strcmp(class_str, epdrv->class_str))
1040 continue;
1041
1042 if (id == -2) {
1043 match_id = epdrv->requested_id;
1044 left = 1;
1045
1046 } else {
1047 match_id = id;
1048 left += early_platform_left(epdrv, id);
1049
1050 /* skip requested id */
1051 switch (epdrv->requested_id) {
1052 case EARLY_PLATFORM_ID_ERROR:
1053 case EARLY_PLATFORM_ID_UNSET:
1054 break;
1055 default:
1056 if (epdrv->requested_id == id)
1057 match_id = EARLY_PLATFORM_ID_UNSET;
1058 }
1059 }
1060
1061 switch (match_id) {
1062 case EARLY_PLATFORM_ID_ERROR:
1063 pr_warning("%s: unable to parse %s parameter\n",
1064 class_str, epdrv->pdrv->driver.name);
1065 /* fall-through */
1066 case EARLY_PLATFORM_ID_UNSET:
1067 match = NULL;
1068 break;
1069 default:
1070 match = early_platform_match(epdrv, match_id);
1071 }
1072
1073 if (match) {
1074 /*
1075 * Set up a sensible init_name to enable
1076 * dev_name() and others to be used before the
1077 * rest of the driver core is initialized.
1078 */
1079 if (!match->dev.init_name && slab_is_available()) {
1080 if (match->id != -1)
1081 match->dev.init_name =
1082 kasprintf(GFP_KERNEL, "%s.%d",
1083 match->name,
1084 match->id);
1085 else
1086 match->dev.init_name =
1087 kasprintf(GFP_KERNEL, "%s",
1088 match->name);
1089
1090 if (!match->dev.init_name)
1091 return -ENOMEM;
1092 }
1093
1094 if (epdrv->pdrv->probe(match))
1095 pr_warning("%s: unable to probe %s early.\n",
1096 class_str, match->name);
1097 else
1098 n++;
1099 }
1100
1101 if (n >= nr_probe)
1102 break;
1103 }
1104
1105 if (left)
1106 return n;
1107 else
1108 return -ENODEV;
1109}
1110
1111/**
1112 * early_platform_driver_probe - probe a class of registered drivers
1113 * @class_str: string to identify early platform driver class
1114 * @nr_probe: number of platform devices to successfully probe before exiting
1115 * @user_only: only probe user specified early platform devices
1116 *
1117 * Used by architecture code to probe registered early platform drivers
1118 * within a certain class. For probe to happen a registered early platform
1119 * device matching a registered early platform driver is needed.
1120 */
1121int __init early_platform_driver_probe(char *class_str,
1122 int nr_probe,
1123 int user_only)
1124{
1125 int k, n, i;
1126
1127 n = 0;
1128 for (i = -2; n < nr_probe; i++) {
1129 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1130
1131 if (k < 0)
1132 break;
1133
1134 n += k;
1135
1136 if (user_only)
1137 break;
1138 }
1139
1140 return n;
1141}
1142
1143/**
1144 * early_platform_cleanup - clean up early platform code
1145 */
1146void __init early_platform_cleanup(void)
1147{
1148 struct platform_device *pd, *pd2;
1149
1150 /* clean up the devres list used to chain devices */
1151 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1152 dev.devres_head) {
1153 list_del(&pd->dev.devres_head);
1154 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1155 }
1156}
1157