Line data Source code
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/interrupt.h>
19 : #include <linux/ioport.h>
20 : #include <linux/dma-mapping.h>
21 : #include <linux/memblock.h>
22 : #include <linux/err.h>
23 : #include <linux/slab.h>
24 : #include <linux/pm_runtime.h>
25 : #include <linux/pm_domain.h>
26 : #include <linux/idr.h>
27 : #include <linux/acpi.h>
28 : #include <linux/clk/clk-conf.h>
29 : #include <linux/limits.h>
30 : #include <linux/property.h>
31 : #include <linux/kmemleak.h>
32 : #include <linux/types.h>
33 : #include <linux/iommu.h>
34 : #include <linux/dma-map-ops.h>
35 :
36 : #include "base.h"
37 : #include "power/power.h"
38 :
39 : /* For automatically allocated device IDs */
40 : static DEFINE_IDA(platform_devid_ida);
41 :
42 : struct device platform_bus = {
43 : .init_name = "platform",
44 : };
45 : EXPORT_SYMBOL_GPL(platform_bus);
46 :
47 : /**
48 : * platform_get_resource - get a resource for a device
49 : * @dev: platform device
50 : * @type: resource type
51 : * @num: resource index
52 : *
53 : * Return: a pointer to the resource or NULL on failure.
54 : */
55 0 : struct resource *platform_get_resource(struct platform_device *dev,
56 : unsigned int type, unsigned int num)
57 : {
58 : u32 i;
59 :
60 0 : for (i = 0; i < dev->num_resources; i++) {
61 0 : struct resource *r = &dev->resource[i];
62 :
63 0 : if (type == resource_type(r) && num-- == 0)
64 : return r;
65 : }
66 : return NULL;
67 : }
68 : EXPORT_SYMBOL_GPL(platform_get_resource);
69 :
70 0 : struct resource *platform_get_mem_or_io(struct platform_device *dev,
71 : unsigned int num)
72 : {
73 : u32 i;
74 :
75 0 : for (i = 0; i < dev->num_resources; i++) {
76 0 : struct resource *r = &dev->resource[i];
77 :
78 0 : if ((resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) && num-- == 0)
79 : return r;
80 : }
81 : return NULL;
82 : }
83 : EXPORT_SYMBOL_GPL(platform_get_mem_or_io);
84 :
85 : #ifdef CONFIG_HAS_IOMEM
86 : /**
87 : * devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a
88 : * platform device and get resource
89 : *
90 : * @pdev: platform device to use both for memory resource lookup as well as
91 : * resource management
92 : * @index: resource index
93 : * @res: optional output parameter to store a pointer to the obtained resource.
94 : *
95 : * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
96 : * on failure.
97 : */
98 : void __iomem *
99 0 : devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
100 : unsigned int index, struct resource **res)
101 : {
102 : struct resource *r;
103 :
104 0 : r = platform_get_resource(pdev, IORESOURCE_MEM, index);
105 0 : if (res)
106 0 : *res = r;
107 0 : return devm_ioremap_resource(&pdev->dev, r);
108 : }
109 : EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource);
110 :
111 : /**
112 : * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
113 : * device
114 : *
115 : * @pdev: platform device to use both for memory resource lookup as well as
116 : * resource management
117 : * @index: resource index
118 : *
119 : * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
120 : * on failure.
121 : */
122 0 : void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
123 : unsigned int index)
124 : {
125 0 : return devm_platform_get_and_ioremap_resource(pdev, index, NULL);
126 : }
127 : EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
128 :
129 : /**
130 : * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for
131 : * a platform device, retrieve the
132 : * resource by name
133 : *
134 : * @pdev: platform device to use both for memory resource lookup as well as
135 : * resource management
136 : * @name: name of the resource
137 : *
138 : * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
139 : * on failure.
140 : */
141 : void __iomem *
142 0 : devm_platform_ioremap_resource_byname(struct platform_device *pdev,
143 : const char *name)
144 : {
145 : struct resource *res;
146 :
147 0 : res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
148 0 : return devm_ioremap_resource(&pdev->dev, res);
149 : }
150 : EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
151 : #endif /* CONFIG_HAS_IOMEM */
152 :
153 : /**
154 : * platform_get_irq_optional - get an optional IRQ for a device
155 : * @dev: platform device
156 : * @num: IRQ number index
157 : *
158 : * Gets an IRQ for a platform device. Device drivers should check the return
159 : * value for errors so as to not pass a negative integer value to the
160 : * request_irq() APIs. This is the same as platform_get_irq(), except that it
161 : * does not print an error message if an IRQ can not be obtained.
162 : *
163 : * For example::
164 : *
165 : * int irq = platform_get_irq_optional(pdev, 0);
166 : * if (irq < 0)
167 : * return irq;
168 : *
169 : * Return: non-zero IRQ number on success, negative error number on failure.
170 : */
171 0 : int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
172 : {
173 : int ret;
174 : #ifdef CONFIG_SPARC
175 : /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
176 : if (!dev || num >= dev->archdata.num_irqs)
177 : goto out_not_found;
178 : ret = dev->archdata.irqs[num];
179 : goto out;
180 : #else
181 : struct resource *r;
182 :
183 : if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
184 : ret = of_irq_get(dev->dev.of_node, num);
185 : if (ret > 0 || ret == -EPROBE_DEFER)
186 : goto out;
187 : }
188 :
189 0 : r = platform_get_resource(dev, IORESOURCE_IRQ, num);
190 0 : if (has_acpi_companion(&dev->dev)) {
191 : if (r && r->flags & IORESOURCE_DISABLED) {
192 : ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
193 : if (ret)
194 : goto out;
195 : }
196 : }
197 :
198 : /*
199 : * The resources may pass trigger flags to the irqs that need
200 : * to be set up. It so happens that the trigger flags for
201 : * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
202 : * settings.
203 : */
204 0 : if (r && r->flags & IORESOURCE_BITS) {
205 : struct irq_data *irqd;
206 :
207 0 : irqd = irq_get_irq_data(r->start);
208 0 : if (!irqd)
209 : goto out_not_found;
210 0 : irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
211 : }
212 :
213 0 : if (r) {
214 0 : ret = r->start;
215 0 : goto out;
216 : }
217 :
218 : /*
219 : * For the index 0 interrupt, allow falling back to GpioInt
220 : * resources. While a device could have both Interrupt and GpioInt
221 : * resources, making this fallback ambiguous, in many common cases
222 : * the device will only expose one IRQ, and this fallback
223 : * allows a common code path across either kind of resource.
224 : */
225 : if (num == 0 && has_acpi_companion(&dev->dev)) {
226 : ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
227 : /* Our callers expect -ENXIO for missing IRQs. */
228 : if (ret >= 0 || ret == -EPROBE_DEFER)
229 : goto out;
230 : }
231 :
232 : #endif
233 : out_not_found:
234 : ret = -ENXIO;
235 : out:
236 0 : if (WARN(!ret, "0 is an invalid IRQ number\n"))
237 : return -EINVAL;
238 0 : return ret;
239 : }
240 : EXPORT_SYMBOL_GPL(platform_get_irq_optional);
241 :
242 : /**
243 : * platform_get_irq - get an IRQ for a device
244 : * @dev: platform device
245 : * @num: IRQ number index
246 : *
247 : * Gets an IRQ for a platform device and prints an error message if finding the
248 : * IRQ fails. Device drivers should check the return value for errors so as to
249 : * not pass a negative integer value to the request_irq() APIs.
250 : *
251 : * For example::
252 : *
253 : * int irq = platform_get_irq(pdev, 0);
254 : * if (irq < 0)
255 : * return irq;
256 : *
257 : * Return: non-zero IRQ number on success, negative error number on failure.
258 : */
259 0 : int platform_get_irq(struct platform_device *dev, unsigned int num)
260 : {
261 : int ret;
262 :
263 0 : ret = platform_get_irq_optional(dev, num);
264 0 : if (ret < 0)
265 0 : return dev_err_probe(&dev->dev, ret,
266 : "IRQ index %u not found\n", num);
267 :
268 : return ret;
269 : }
270 : EXPORT_SYMBOL_GPL(platform_get_irq);
271 :
272 : /**
273 : * platform_irq_count - Count the number of IRQs a platform device uses
274 : * @dev: platform device
275 : *
276 : * Return: Number of IRQs a platform device uses or EPROBE_DEFER
277 : */
278 0 : int platform_irq_count(struct platform_device *dev)
279 : {
280 0 : int ret, nr = 0;
281 :
282 0 : while ((ret = platform_get_irq_optional(dev, nr)) >= 0)
283 0 : nr++;
284 :
285 0 : if (ret == -EPROBE_DEFER)
286 : return ret;
287 :
288 0 : return nr;
289 : }
290 : EXPORT_SYMBOL_GPL(platform_irq_count);
291 :
292 : struct irq_affinity_devres {
293 : unsigned int count;
294 : unsigned int irq[];
295 : };
296 :
297 : static void platform_disable_acpi_irq(struct platform_device *pdev, int index)
298 : {
299 : struct resource *r;
300 :
301 : r = platform_get_resource(pdev, IORESOURCE_IRQ, index);
302 : if (r)
303 : irqresource_disabled(r, 0);
304 : }
305 :
306 0 : static void devm_platform_get_irqs_affinity_release(struct device *dev,
307 : void *res)
308 : {
309 0 : struct irq_affinity_devres *ptr = res;
310 : int i;
311 :
312 0 : for (i = 0; i < ptr->count; i++) {
313 0 : irq_dispose_mapping(ptr->irq[i]);
314 :
315 0 : if (has_acpi_companion(dev))
316 : platform_disable_acpi_irq(to_platform_device(dev), i);
317 : }
318 0 : }
319 :
320 : /**
321 : * devm_platform_get_irqs_affinity - devm method to get a set of IRQs for a
322 : * device using an interrupt affinity descriptor
323 : * @dev: platform device pointer
324 : * @affd: affinity descriptor
325 : * @minvec: minimum count of interrupt vectors
326 : * @maxvec: maximum count of interrupt vectors
327 : * @irqs: pointer holder for IRQ numbers
328 : *
329 : * Gets a set of IRQs for a platform device, and updates IRQ afffinty according
330 : * to the passed affinity descriptor
331 : *
332 : * Return: Number of vectors on success, negative error number on failure.
333 : */
334 0 : int devm_platform_get_irqs_affinity(struct platform_device *dev,
335 : struct irq_affinity *affd,
336 : unsigned int minvec,
337 : unsigned int maxvec,
338 : int **irqs)
339 : {
340 : struct irq_affinity_devres *ptr;
341 : struct irq_affinity_desc *desc;
342 : size_t size;
343 : int i, ret, nvec;
344 :
345 0 : if (!affd)
346 : return -EPERM;
347 :
348 0 : if (maxvec < minvec)
349 : return -ERANGE;
350 :
351 0 : nvec = platform_irq_count(dev);
352 0 : if (nvec < 0)
353 : return nvec;
354 :
355 0 : if (nvec < minvec)
356 : return -ENOSPC;
357 :
358 0 : nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
359 : if (nvec < minvec)
360 : return -ENOSPC;
361 :
362 0 : if (nvec > maxvec)
363 0 : nvec = maxvec;
364 :
365 0 : size = sizeof(*ptr) + sizeof(unsigned int) * nvec;
366 0 : ptr = devres_alloc(devm_platform_get_irqs_affinity_release, size,
367 : GFP_KERNEL);
368 0 : if (!ptr)
369 : return -ENOMEM;
370 :
371 0 : ptr->count = nvec;
372 :
373 0 : for (i = 0; i < nvec; i++) {
374 0 : int irq = platform_get_irq(dev, i);
375 0 : if (irq < 0) {
376 : ret = irq;
377 : goto err_free_devres;
378 : }
379 0 : ptr->irq[i] = irq;
380 : }
381 :
382 : desc = irq_create_affinity_masks(nvec, affd);
383 : if (!desc) {
384 : ret = -ENOMEM;
385 : goto err_free_devres;
386 : }
387 :
388 : for (i = 0; i < nvec; i++) {
389 : ret = irq_update_affinity_desc(ptr->irq[i], &desc[i]);
390 : if (ret) {
391 : dev_err(&dev->dev, "failed to update irq%d affinity descriptor (%d)\n",
392 : ptr->irq[i], ret);
393 : goto err_free_desc;
394 : }
395 : }
396 :
397 : devres_add(&dev->dev, ptr);
398 :
399 : kfree(desc);
400 :
401 : *irqs = ptr->irq;
402 :
403 : return nvec;
404 :
405 : err_free_desc:
406 : kfree(desc);
407 : err_free_devres:
408 0 : devres_free(ptr);
409 0 : return ret;
410 : }
411 : EXPORT_SYMBOL_GPL(devm_platform_get_irqs_affinity);
412 :
413 : /**
414 : * platform_get_resource_byname - get a resource for a device by name
415 : * @dev: platform device
416 : * @type: resource type
417 : * @name: resource name
418 : */
419 0 : struct resource *platform_get_resource_byname(struct platform_device *dev,
420 : unsigned int type,
421 : const char *name)
422 : {
423 : u32 i;
424 :
425 0 : for (i = 0; i < dev->num_resources; i++) {
426 0 : struct resource *r = &dev->resource[i];
427 :
428 0 : if (unlikely(!r->name))
429 0 : continue;
430 :
431 0 : if (type == resource_type(r) && !strcmp(r->name, name))
432 : return r;
433 : }
434 : return NULL;
435 : }
436 : EXPORT_SYMBOL_GPL(platform_get_resource_byname);
437 :
438 0 : static int __platform_get_irq_byname(struct platform_device *dev,
439 : const char *name)
440 : {
441 : struct resource *r;
442 : int ret;
443 :
444 0 : ret = fwnode_irq_get_byname(dev_fwnode(&dev->dev), name);
445 0 : if (ret > 0 || ret == -EPROBE_DEFER)
446 : return ret;
447 :
448 0 : r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
449 0 : if (r) {
450 0 : if (WARN(!r->start, "0 is an invalid IRQ number\n"))
451 : return -EINVAL;
452 0 : return r->start;
453 : }
454 :
455 : return -ENXIO;
456 : }
457 :
458 : /**
459 : * platform_get_irq_byname - get an IRQ for a device by name
460 : * @dev: platform device
461 : * @name: IRQ name
462 : *
463 : * Get an IRQ like platform_get_irq(), but then by name rather then by index.
464 : *
465 : * Return: non-zero IRQ number on success, negative error number on failure.
466 : */
467 0 : int platform_get_irq_byname(struct platform_device *dev, const char *name)
468 : {
469 : int ret;
470 :
471 0 : ret = __platform_get_irq_byname(dev, name);
472 0 : if (ret < 0)
473 0 : return dev_err_probe(&dev->dev, ret, "IRQ %s not found\n",
474 : name);
475 : return ret;
476 : }
477 : EXPORT_SYMBOL_GPL(platform_get_irq_byname);
478 :
479 : /**
480 : * platform_get_irq_byname_optional - get an optional IRQ for a device by name
481 : * @dev: platform device
482 : * @name: IRQ name
483 : *
484 : * Get an optional IRQ by name like platform_get_irq_byname(). Except that it
485 : * does not print an error message if an IRQ can not be obtained.
486 : *
487 : * Return: non-zero IRQ number on success, negative error number on failure.
488 : */
489 0 : int platform_get_irq_byname_optional(struct platform_device *dev,
490 : const char *name)
491 : {
492 0 : return __platform_get_irq_byname(dev, name);
493 : }
494 : EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional);
495 :
496 : /**
497 : * platform_add_devices - add a numbers of platform devices
498 : * @devs: array of platform devices to add
499 : * @num: number of platform devices in array
500 : *
501 : * Return: 0 on success, negative error number on failure.
502 : */
503 0 : int platform_add_devices(struct platform_device **devs, int num)
504 : {
505 0 : int i, ret = 0;
506 :
507 0 : for (i = 0; i < num; i++) {
508 0 : ret = platform_device_register(devs[i]);
509 0 : if (ret) {
510 0 : while (--i >= 0)
511 0 : platform_device_unregister(devs[i]);
512 : break;
513 : }
514 : }
515 :
516 0 : return ret;
517 : }
518 : EXPORT_SYMBOL_GPL(platform_add_devices);
519 :
520 : struct platform_object {
521 : struct platform_device pdev;
522 : char name[];
523 : };
524 :
525 : /*
526 : * Set up default DMA mask for platform devices if the they weren't
527 : * previously set by the architecture / DT.
528 : */
529 : static void setup_pdev_dma_masks(struct platform_device *pdev)
530 : {
531 5 : pdev->dev.dma_parms = &pdev->dma_parms;
532 :
533 5 : if (!pdev->dev.coherent_dma_mask)
534 5 : pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
535 5 : if (!pdev->dev.dma_mask) {
536 5 : pdev->platform_dma_mask = DMA_BIT_MASK(32);
537 5 : pdev->dev.dma_mask = &pdev->platform_dma_mask;
538 : }
539 : };
540 :
541 : /**
542 : * platform_device_put - destroy a platform device
543 : * @pdev: platform device to free
544 : *
545 : * Free all memory associated with a platform device. This function must
546 : * _only_ be externally called in error cases. All other usage is a bug.
547 : */
548 5 : void platform_device_put(struct platform_device *pdev)
549 : {
550 5 : if (!IS_ERR_OR_NULL(pdev))
551 5 : put_device(&pdev->dev);
552 5 : }
553 : EXPORT_SYMBOL_GPL(platform_device_put);
554 :
555 5 : static void platform_device_release(struct device *dev)
556 : {
557 5 : struct platform_object *pa = container_of(dev, struct platform_object,
558 : pdev.dev);
559 :
560 5 : of_node_put(pa->pdev.dev.of_node);
561 5 : kfree(pa->pdev.dev.platform_data);
562 5 : kfree(pa->pdev.mfd_cell);
563 5 : kfree(pa->pdev.resource);
564 5 : kfree(pa->pdev.driver_override);
565 5 : kfree(pa);
566 5 : }
567 :
568 : /**
569 : * platform_device_alloc - create a platform device
570 : * @name: base name of the device we're adding
571 : * @id: instance id
572 : *
573 : * Create a platform device object which can have other objects attached
574 : * to it, and which will have attached objects freed when it is released.
575 : */
576 5 : struct platform_device *platform_device_alloc(const char *name, int id)
577 : {
578 : struct platform_object *pa;
579 :
580 5 : pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
581 5 : if (pa) {
582 10 : strcpy(pa->name, name);
583 5 : pa->pdev.name = pa->name;
584 5 : pa->pdev.id = id;
585 5 : device_initialize(&pa->pdev.dev);
586 5 : pa->pdev.dev.release = platform_device_release;
587 5 : setup_pdev_dma_masks(&pa->pdev);
588 : }
589 :
590 5 : return pa ? &pa->pdev : NULL;
591 : }
592 : EXPORT_SYMBOL_GPL(platform_device_alloc);
593 :
594 : /**
595 : * platform_device_add_resources - add resources to a platform device
596 : * @pdev: platform device allocated by platform_device_alloc to add resources to
597 : * @res: set of resources that needs to be allocated for the device
598 : * @num: number of resources
599 : *
600 : * Add a copy of the resources to the platform device. The memory
601 : * associated with the resources will be freed when the platform device is
602 : * released.
603 : */
604 0 : int platform_device_add_resources(struct platform_device *pdev,
605 : const struct resource *res, unsigned int num)
606 : {
607 0 : struct resource *r = NULL;
608 :
609 0 : if (res) {
610 0 : r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
611 0 : if (!r)
612 : return -ENOMEM;
613 : }
614 :
615 0 : kfree(pdev->resource);
616 0 : pdev->resource = r;
617 0 : pdev->num_resources = num;
618 0 : return 0;
619 : }
620 : EXPORT_SYMBOL_GPL(platform_device_add_resources);
621 :
622 : /**
623 : * platform_device_add_data - add platform-specific data to a platform device
624 : * @pdev: platform device allocated by platform_device_alloc to add resources to
625 : * @data: platform specific data for this platform device
626 : * @size: size of platform specific data
627 : *
628 : * Add a copy of platform specific data to the platform device's
629 : * platform_data pointer. The memory associated with the platform data
630 : * will be freed when the platform device is released.
631 : */
632 0 : int platform_device_add_data(struct platform_device *pdev, const void *data,
633 : size_t size)
634 : {
635 0 : void *d = NULL;
636 :
637 0 : if (data) {
638 0 : d = kmemdup(data, size, GFP_KERNEL);
639 0 : if (!d)
640 : return -ENOMEM;
641 : }
642 :
643 0 : kfree(pdev->dev.platform_data);
644 0 : pdev->dev.platform_data = d;
645 0 : return 0;
646 : }
647 : EXPORT_SYMBOL_GPL(platform_device_add_data);
648 :
649 : /**
650 : * platform_device_add - add a platform device to device hierarchy
651 : * @pdev: platform device we're adding
652 : *
653 : * This is part 2 of platform_device_register(), though may be called
654 : * separately _iff_ pdev was allocated by platform_device_alloc().
655 : */
656 5 : int platform_device_add(struct platform_device *pdev)
657 : {
658 : u32 i;
659 : int ret;
660 :
661 5 : if (!pdev)
662 : return -EINVAL;
663 :
664 5 : if (!pdev->dev.parent)
665 5 : pdev->dev.parent = &platform_bus;
666 :
667 5 : pdev->dev.bus = &platform_bus_type;
668 :
669 5 : switch (pdev->id) {
670 : default:
671 0 : dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
672 0 : break;
673 : case PLATFORM_DEVID_NONE:
674 5 : dev_set_name(&pdev->dev, "%s", pdev->name);
675 5 : break;
676 : case PLATFORM_DEVID_AUTO:
677 : /*
678 : * Automatically allocated device ID. We mark it as such so
679 : * that we remember it must be freed, and we append a suffix
680 : * to avoid namespace collision with explicit IDs.
681 : */
682 0 : ret = ida_alloc(&platform_devid_ida, GFP_KERNEL);
683 0 : if (ret < 0)
684 : goto err_out;
685 0 : pdev->id = ret;
686 0 : pdev->id_auto = true;
687 0 : dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
688 0 : break;
689 : }
690 :
691 0 : for (i = 0; i < pdev->num_resources; i++) {
692 0 : struct resource *p, *r = &pdev->resource[i];
693 :
694 0 : if (r->name == NULL)
695 0 : r->name = dev_name(&pdev->dev);
696 :
697 0 : p = r->parent;
698 0 : if (!p) {
699 0 : if (resource_type(r) == IORESOURCE_MEM)
700 : p = &iomem_resource;
701 0 : else if (resource_type(r) == IORESOURCE_IO)
702 0 : p = &ioport_resource;
703 : }
704 :
705 0 : if (p) {
706 0 : ret = insert_resource(p, r);
707 0 : if (ret) {
708 0 : dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
709 0 : goto failed;
710 : }
711 : }
712 : }
713 :
714 : pr_debug("Registering platform device '%s'. Parent at %s\n",
715 : dev_name(&pdev->dev), dev_name(pdev->dev.parent));
716 :
717 5 : ret = device_add(&pdev->dev);
718 5 : if (ret == 0)
719 : return ret;
720 :
721 : failed:
722 0 : if (pdev->id_auto) {
723 0 : ida_free(&platform_devid_ida, pdev->id);
724 0 : pdev->id = PLATFORM_DEVID_AUTO;
725 : }
726 :
727 0 : while (i--) {
728 0 : struct resource *r = &pdev->resource[i];
729 0 : if (r->parent)
730 0 : release_resource(r);
731 : }
732 :
733 : err_out:
734 : return ret;
735 : }
736 : EXPORT_SYMBOL_GPL(platform_device_add);
737 :
738 : /**
739 : * platform_device_del - remove a platform-level device
740 : * @pdev: platform device we're removing
741 : *
742 : * Note that this function will also release all memory- and port-based
743 : * resources owned by the device (@dev->resource). This function must
744 : * _only_ be externally called in error cases. All other usage is a bug.
745 : */
746 5 : void platform_device_del(struct platform_device *pdev)
747 : {
748 : u32 i;
749 :
750 5 : if (!IS_ERR_OR_NULL(pdev)) {
751 5 : device_del(&pdev->dev);
752 :
753 5 : if (pdev->id_auto) {
754 0 : ida_free(&platform_devid_ida, pdev->id);
755 0 : pdev->id = PLATFORM_DEVID_AUTO;
756 : }
757 :
758 0 : for (i = 0; i < pdev->num_resources; i++) {
759 0 : struct resource *r = &pdev->resource[i];
760 0 : if (r->parent)
761 0 : release_resource(r);
762 : }
763 : }
764 5 : }
765 : EXPORT_SYMBOL_GPL(platform_device_del);
766 :
767 : /**
768 : * platform_device_register - add a platform-level device
769 : * @pdev: platform device we're adding
770 : *
771 : * NOTE: _Never_ directly free @pdev after calling this function, even if it
772 : * returned an error! Always use platform_device_put() to give up the
773 : * reference initialised in this function instead.
774 : */
775 0 : int platform_device_register(struct platform_device *pdev)
776 : {
777 0 : device_initialize(&pdev->dev);
778 0 : setup_pdev_dma_masks(pdev);
779 0 : return platform_device_add(pdev);
780 : }
781 : EXPORT_SYMBOL_GPL(platform_device_register);
782 :
783 : /**
784 : * platform_device_unregister - unregister a platform-level device
785 : * @pdev: platform device we're unregistering
786 : *
787 : * Unregistration is done in 2 steps. First we release all resources
788 : * and remove it from the subsystem, then we drop reference count by
789 : * calling platform_device_put().
790 : */
791 0 : void platform_device_unregister(struct platform_device *pdev)
792 : {
793 0 : platform_device_del(pdev);
794 0 : platform_device_put(pdev);
795 0 : }
796 : EXPORT_SYMBOL_GPL(platform_device_unregister);
797 :
798 : /**
799 : * platform_device_register_full - add a platform-level device with
800 : * resources and platform-specific data
801 : *
802 : * @pdevinfo: data used to create device
803 : *
804 : * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
805 : */
806 0 : struct platform_device *platform_device_register_full(
807 : const struct platform_device_info *pdevinfo)
808 : {
809 : int ret;
810 : struct platform_device *pdev;
811 :
812 0 : pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
813 0 : if (!pdev)
814 : return ERR_PTR(-ENOMEM);
815 :
816 0 : pdev->dev.parent = pdevinfo->parent;
817 0 : pdev->dev.fwnode = pdevinfo->fwnode;
818 0 : pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode));
819 0 : pdev->dev.of_node_reused = pdevinfo->of_node_reused;
820 :
821 0 : if (pdevinfo->dma_mask) {
822 0 : pdev->platform_dma_mask = pdevinfo->dma_mask;
823 0 : pdev->dev.dma_mask = &pdev->platform_dma_mask;
824 0 : pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
825 : }
826 :
827 0 : ret = platform_device_add_resources(pdev,
828 : pdevinfo->res, pdevinfo->num_res);
829 0 : if (ret)
830 : goto err;
831 :
832 0 : ret = platform_device_add_data(pdev,
833 : pdevinfo->data, pdevinfo->size_data);
834 0 : if (ret)
835 : goto err;
836 :
837 0 : if (pdevinfo->properties) {
838 0 : ret = device_create_managed_software_node(&pdev->dev,
839 : pdevinfo->properties, NULL);
840 0 : if (ret)
841 : goto err;
842 : }
843 :
844 0 : ret = platform_device_add(pdev);
845 0 : if (ret) {
846 : err:
847 : ACPI_COMPANION_SET(&pdev->dev, NULL);
848 0 : platform_device_put(pdev);
849 0 : return ERR_PTR(ret);
850 : }
851 :
852 : return pdev;
853 : }
854 : EXPORT_SYMBOL_GPL(platform_device_register_full);
855 :
856 : /**
857 : * __platform_driver_register - register a driver for platform-level devices
858 : * @drv: platform driver structure
859 : * @owner: owning module/driver
860 : */
861 7 : int __platform_driver_register(struct platform_driver *drv,
862 : struct module *owner)
863 : {
864 7 : drv->driver.owner = owner;
865 7 : drv->driver.bus = &platform_bus_type;
866 :
867 7 : return driver_register(&drv->driver);
868 : }
869 : EXPORT_SYMBOL_GPL(__platform_driver_register);
870 :
871 : /**
872 : * platform_driver_unregister - unregister a driver for platform-level devices
873 : * @drv: platform driver structure
874 : */
875 6 : void platform_driver_unregister(struct platform_driver *drv)
876 : {
877 6 : driver_unregister(&drv->driver);
878 6 : }
879 : EXPORT_SYMBOL_GPL(platform_driver_unregister);
880 :
881 0 : static int platform_probe_fail(struct platform_device *pdev)
882 : {
883 0 : return -ENXIO;
884 : }
885 :
886 0 : static int is_bound_to_driver(struct device *dev, void *driver)
887 : {
888 0 : if (dev->driver == driver)
889 : return 1;
890 0 : return 0;
891 : }
892 :
893 : /**
894 : * __platform_driver_probe - register driver for non-hotpluggable device
895 : * @drv: platform driver structure
896 : * @probe: the driver probe routine, probably from an __init section
897 : * @module: module which will be the owner of the driver
898 : *
899 : * Use this instead of platform_driver_register() when you know the device
900 : * is not hotpluggable and has already been registered, and you want to
901 : * remove its run-once probe() infrastructure from memory after the driver
902 : * has bound to the device.
903 : *
904 : * One typical use for this would be with drivers for controllers integrated
905 : * into system-on-chip processors, where the controller devices have been
906 : * configured as part of board setup.
907 : *
908 : * Note that this is incompatible with deferred probing.
909 : *
910 : * Returns zero if the driver registered and bound to a device, else returns
911 : * a negative error code and with the driver not registered.
912 : */
913 0 : int __init_or_module __platform_driver_probe(struct platform_driver *drv,
914 : int (*probe)(struct platform_device *), struct module *module)
915 : {
916 : int retval;
917 :
918 0 : if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
919 0 : pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
920 : drv->driver.name, __func__);
921 0 : return -EINVAL;
922 : }
923 :
924 : /*
925 : * We have to run our probes synchronously because we check if
926 : * we find any devices to bind to and exit with error if there
927 : * are any.
928 : */
929 0 : drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
930 :
931 : /*
932 : * Prevent driver from requesting probe deferral to avoid further
933 : * futile probe attempts.
934 : */
935 0 : drv->prevent_deferred_probe = true;
936 :
937 : /* make sure driver won't have bind/unbind attributes */
938 0 : drv->driver.suppress_bind_attrs = true;
939 :
940 : /* temporary section violation during probe() */
941 0 : drv->probe = probe;
942 0 : retval = __platform_driver_register(drv, module);
943 0 : if (retval)
944 : return retval;
945 :
946 : /* Force all new probes of this driver to fail */
947 0 : drv->probe = platform_probe_fail;
948 :
949 : /* Walk all platform devices and see if any actually bound to this driver.
950 : * If not, return an error as the device should have done so by now.
951 : */
952 0 : if (!bus_for_each_dev(&platform_bus_type, NULL, &drv->driver, is_bound_to_driver)) {
953 0 : retval = -ENODEV;
954 : platform_driver_unregister(drv);
955 : }
956 :
957 : return retval;
958 : }
959 : EXPORT_SYMBOL_GPL(__platform_driver_probe);
960 :
961 : /**
962 : * __platform_create_bundle - register driver and create corresponding device
963 : * @driver: platform driver structure
964 : * @probe: the driver probe routine, probably from an __init section
965 : * @res: set of resources that needs to be allocated for the device
966 : * @n_res: number of resources
967 : * @data: platform specific data for this platform device
968 : * @size: size of platform specific data
969 : * @module: module which will be the owner of the driver
970 : *
971 : * Use this in legacy-style modules that probe hardware directly and
972 : * register a single platform device and corresponding platform driver.
973 : *
974 : * Returns &struct platform_device pointer on success, or ERR_PTR() on error.
975 : */
976 0 : struct platform_device * __init_or_module __platform_create_bundle(
977 : struct platform_driver *driver,
978 : int (*probe)(struct platform_device *),
979 : struct resource *res, unsigned int n_res,
980 : const void *data, size_t size, struct module *module)
981 : {
982 : struct platform_device *pdev;
983 : int error;
984 :
985 0 : pdev = platform_device_alloc(driver->driver.name, -1);
986 0 : if (!pdev) {
987 : error = -ENOMEM;
988 : goto err_out;
989 : }
990 :
991 0 : error = platform_device_add_resources(pdev, res, n_res);
992 0 : if (error)
993 : goto err_pdev_put;
994 :
995 0 : error = platform_device_add_data(pdev, data, size);
996 0 : if (error)
997 : goto err_pdev_put;
998 :
999 0 : error = platform_device_add(pdev);
1000 0 : if (error)
1001 : goto err_pdev_put;
1002 :
1003 0 : error = __platform_driver_probe(driver, probe, module);
1004 0 : if (error)
1005 : goto err_pdev_del;
1006 :
1007 : return pdev;
1008 :
1009 : err_pdev_del:
1010 0 : platform_device_del(pdev);
1011 : err_pdev_put:
1012 : platform_device_put(pdev);
1013 : err_out:
1014 0 : return ERR_PTR(error);
1015 : }
1016 : EXPORT_SYMBOL_GPL(__platform_create_bundle);
1017 :
1018 : /**
1019 : * __platform_register_drivers - register an array of platform drivers
1020 : * @drivers: an array of drivers to register
1021 : * @count: the number of drivers to register
1022 : * @owner: module owning the drivers
1023 : *
1024 : * Registers platform drivers specified by an array. On failure to register a
1025 : * driver, all previously registered drivers will be unregistered. Callers of
1026 : * this API should use platform_unregister_drivers() to unregister drivers in
1027 : * the reverse order.
1028 : *
1029 : * Returns: 0 on success or a negative error code on failure.
1030 : */
1031 0 : int __platform_register_drivers(struct platform_driver * const *drivers,
1032 : unsigned int count, struct module *owner)
1033 : {
1034 : unsigned int i;
1035 : int err;
1036 :
1037 0 : for (i = 0; i < count; i++) {
1038 : pr_debug("registering platform driver %ps\n", drivers[i]);
1039 :
1040 0 : err = __platform_driver_register(drivers[i], owner);
1041 0 : if (err < 0) {
1042 0 : pr_err("failed to register platform driver %ps: %d\n",
1043 : drivers[i], err);
1044 : goto error;
1045 : }
1046 : }
1047 :
1048 : return 0;
1049 :
1050 : error:
1051 0 : while (i--) {
1052 : pr_debug("unregistering platform driver %ps\n", drivers[i]);
1053 0 : platform_driver_unregister(drivers[i]);
1054 : }
1055 :
1056 : return err;
1057 : }
1058 : EXPORT_SYMBOL_GPL(__platform_register_drivers);
1059 :
1060 : /**
1061 : * platform_unregister_drivers - unregister an array of platform drivers
1062 : * @drivers: an array of drivers to unregister
1063 : * @count: the number of drivers to unregister
1064 : *
1065 : * Unregisters platform drivers specified by an array. This is typically used
1066 : * to complement an earlier call to platform_register_drivers(). Drivers are
1067 : * unregistered in the reverse order in which they were registered.
1068 : */
1069 0 : void platform_unregister_drivers(struct platform_driver * const *drivers,
1070 : unsigned int count)
1071 : {
1072 0 : while (count--) {
1073 : pr_debug("unregistering platform driver %ps\n", drivers[count]);
1074 0 : platform_driver_unregister(drivers[count]);
1075 : }
1076 0 : }
1077 : EXPORT_SYMBOL_GPL(platform_unregister_drivers);
1078 :
1079 : static const struct platform_device_id *platform_match_id(
1080 : const struct platform_device_id *id,
1081 : struct platform_device *pdev)
1082 : {
1083 0 : while (id->name[0]) {
1084 0 : if (strcmp(pdev->name, id->name) == 0) {
1085 0 : pdev->id_entry = id;
1086 : return id;
1087 : }
1088 0 : id++;
1089 : }
1090 : return NULL;
1091 : }
1092 :
1093 : #ifdef CONFIG_PM_SLEEP
1094 :
1095 : static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
1096 : {
1097 0 : struct platform_driver *pdrv = to_platform_driver(dev->driver);
1098 0 : struct platform_device *pdev = to_platform_device(dev);
1099 0 : int ret = 0;
1100 :
1101 0 : if (dev->driver && pdrv->suspend)
1102 0 : ret = pdrv->suspend(pdev, mesg);
1103 :
1104 : return ret;
1105 : }
1106 :
1107 : static int platform_legacy_resume(struct device *dev)
1108 : {
1109 0 : struct platform_driver *pdrv = to_platform_driver(dev->driver);
1110 0 : struct platform_device *pdev = to_platform_device(dev);
1111 0 : int ret = 0;
1112 :
1113 0 : if (dev->driver && pdrv->resume)
1114 0 : ret = pdrv->resume(pdev);
1115 :
1116 : return ret;
1117 : }
1118 :
1119 : #endif /* CONFIG_PM_SLEEP */
1120 :
1121 : #ifdef CONFIG_SUSPEND
1122 :
1123 0 : int platform_pm_suspend(struct device *dev)
1124 : {
1125 0 : struct device_driver *drv = dev->driver;
1126 0 : int ret = 0;
1127 :
1128 0 : if (!drv)
1129 : return 0;
1130 :
1131 0 : if (drv->pm) {
1132 0 : if (drv->pm->suspend)
1133 0 : ret = drv->pm->suspend(dev);
1134 : } else {
1135 0 : ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1136 : }
1137 :
1138 : return ret;
1139 : }
1140 :
1141 0 : int platform_pm_resume(struct device *dev)
1142 : {
1143 0 : struct device_driver *drv = dev->driver;
1144 0 : int ret = 0;
1145 :
1146 0 : if (!drv)
1147 : return 0;
1148 :
1149 0 : if (drv->pm) {
1150 0 : if (drv->pm->resume)
1151 0 : ret = drv->pm->resume(dev);
1152 : } else {
1153 : ret = platform_legacy_resume(dev);
1154 : }
1155 :
1156 : return ret;
1157 : }
1158 :
1159 : #endif /* CONFIG_SUSPEND */
1160 :
1161 : #ifdef CONFIG_HIBERNATE_CALLBACKS
1162 :
1163 : int platform_pm_freeze(struct device *dev)
1164 : {
1165 : struct device_driver *drv = dev->driver;
1166 : int ret = 0;
1167 :
1168 : if (!drv)
1169 : return 0;
1170 :
1171 : if (drv->pm) {
1172 : if (drv->pm->freeze)
1173 : ret = drv->pm->freeze(dev);
1174 : } else {
1175 : ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1176 : }
1177 :
1178 : return ret;
1179 : }
1180 :
1181 : int platform_pm_thaw(struct device *dev)
1182 : {
1183 : struct device_driver *drv = dev->driver;
1184 : int ret = 0;
1185 :
1186 : if (!drv)
1187 : return 0;
1188 :
1189 : if (drv->pm) {
1190 : if (drv->pm->thaw)
1191 : ret = drv->pm->thaw(dev);
1192 : } else {
1193 : ret = platform_legacy_resume(dev);
1194 : }
1195 :
1196 : return ret;
1197 : }
1198 :
1199 : int platform_pm_poweroff(struct device *dev)
1200 : {
1201 : struct device_driver *drv = dev->driver;
1202 : int ret = 0;
1203 :
1204 : if (!drv)
1205 : return 0;
1206 :
1207 : if (drv->pm) {
1208 : if (drv->pm->poweroff)
1209 : ret = drv->pm->poweroff(dev);
1210 : } else {
1211 : ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1212 : }
1213 :
1214 : return ret;
1215 : }
1216 :
1217 : int platform_pm_restore(struct device *dev)
1218 : {
1219 : struct device_driver *drv = dev->driver;
1220 : int ret = 0;
1221 :
1222 : if (!drv)
1223 : return 0;
1224 :
1225 : if (drv->pm) {
1226 : if (drv->pm->restore)
1227 : ret = drv->pm->restore(dev);
1228 : } else {
1229 : ret = platform_legacy_resume(dev);
1230 : }
1231 :
1232 : return ret;
1233 : }
1234 :
1235 : #endif /* CONFIG_HIBERNATE_CALLBACKS */
1236 :
1237 : /* modalias support enables more hands-off userspace setup:
1238 : * (a) environment variable lets new-style hotplug events work once system is
1239 : * fully running: "modprobe $MODALIAS"
1240 : * (b) sysfs attribute lets new-style coldplug recover from hotplug events
1241 : * mishandled before system is fully running: "modprobe $(cat modalias)"
1242 : */
1243 0 : static ssize_t modalias_show(struct device *dev,
1244 : struct device_attribute *attr, char *buf)
1245 : {
1246 0 : struct platform_device *pdev = to_platform_device(dev);
1247 : int len;
1248 :
1249 0 : len = of_device_modalias(dev, buf, PAGE_SIZE);
1250 : if (len != -ENODEV)
1251 : return len;
1252 :
1253 0 : len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
1254 : if (len != -ENODEV)
1255 : return len;
1256 :
1257 0 : return sysfs_emit(buf, "platform:%s\n", pdev->name);
1258 : }
1259 : static DEVICE_ATTR_RO(modalias);
1260 :
1261 0 : static ssize_t numa_node_show(struct device *dev,
1262 : struct device_attribute *attr, char *buf)
1263 : {
1264 0 : return sysfs_emit(buf, "%d\n", dev_to_node(dev));
1265 : }
1266 : static DEVICE_ATTR_RO(numa_node);
1267 :
1268 0 : static ssize_t driver_override_show(struct device *dev,
1269 : struct device_attribute *attr, char *buf)
1270 : {
1271 0 : struct platform_device *pdev = to_platform_device(dev);
1272 : ssize_t len;
1273 :
1274 0 : device_lock(dev);
1275 0 : len = sysfs_emit(buf, "%s\n", pdev->driver_override);
1276 0 : device_unlock(dev);
1277 :
1278 0 : return len;
1279 : }
1280 :
1281 0 : static ssize_t driver_override_store(struct device *dev,
1282 : struct device_attribute *attr,
1283 : const char *buf, size_t count)
1284 : {
1285 0 : struct platform_device *pdev = to_platform_device(dev);
1286 : int ret;
1287 :
1288 0 : ret = driver_set_override(dev, &pdev->driver_override, buf, count);
1289 0 : if (ret)
1290 0 : return ret;
1291 :
1292 0 : return count;
1293 : }
1294 : static DEVICE_ATTR_RW(driver_override);
1295 :
1296 : static struct attribute *platform_dev_attrs[] = {
1297 : &dev_attr_modalias.attr,
1298 : &dev_attr_numa_node.attr,
1299 : &dev_attr_driver_override.attr,
1300 : NULL,
1301 : };
1302 :
1303 15 : static umode_t platform_dev_attrs_visible(struct kobject *kobj, struct attribute *a,
1304 : int n)
1305 : {
1306 15 : struct device *dev = container_of(kobj, typeof(*dev), kobj);
1307 :
1308 15 : if (a == &dev_attr_numa_node.attr &&
1309 : dev_to_node(dev) == NUMA_NO_NODE)
1310 : return 0;
1311 :
1312 10 : return a->mode;
1313 : }
1314 :
1315 : static const struct attribute_group platform_dev_group = {
1316 : .attrs = platform_dev_attrs,
1317 : .is_visible = platform_dev_attrs_visible,
1318 : };
1319 : __ATTRIBUTE_GROUPS(platform_dev);
1320 :
1321 :
1322 : /**
1323 : * platform_match - bind platform device to platform driver.
1324 : * @dev: device.
1325 : * @drv: driver.
1326 : *
1327 : * Platform device IDs are assumed to be encoded like this:
1328 : * "<name><instance>", where <name> is a short description of the type of
1329 : * device, like "pci" or "floppy", and <instance> is the enumerated
1330 : * instance of the device, like '0' or '42'. Driver IDs are simply
1331 : * "<name>". So, extract the <name> from the platform_device structure,
1332 : * and compare it against the name of the driver. Return whether they match
1333 : * or not.
1334 : */
1335 15 : static int platform_match(struct device *dev, struct device_driver *drv)
1336 : {
1337 15 : struct platform_device *pdev = to_platform_device(dev);
1338 15 : struct platform_driver *pdrv = to_platform_driver(drv);
1339 :
1340 : /* When driver_override is set, only bind to the matching driver */
1341 15 : if (pdev->driver_override)
1342 0 : return !strcmp(pdev->driver_override, drv->name);
1343 :
1344 : /* Attempt an OF style match first */
1345 15 : if (of_driver_match_device(dev, drv))
1346 : return 1;
1347 :
1348 : /* Then try ACPI style match */
1349 15 : if (acpi_driver_match_device(dev, drv))
1350 : return 1;
1351 :
1352 : /* Then try to match against the id table */
1353 15 : if (pdrv->id_table)
1354 0 : return platform_match_id(pdrv->id_table, pdev) != NULL;
1355 :
1356 : /* fall-back to driver name match */
1357 15 : return (strcmp(pdev->name, drv->name) == 0);
1358 : }
1359 :
1360 20 : static int platform_uevent(const struct device *dev, struct kobj_uevent_env *env)
1361 : {
1362 20 : const struct platform_device *pdev = to_platform_device(dev);
1363 : int rc;
1364 :
1365 : /* Some devices have extra OF data and an OF-style MODALIAS */
1366 20 : rc = of_device_uevent_modalias(dev, env);
1367 : if (rc != -ENODEV)
1368 : return rc;
1369 :
1370 20 : rc = acpi_device_uevent_modalias(dev, env);
1371 : if (rc != -ENODEV)
1372 : return rc;
1373 :
1374 20 : add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
1375 : pdev->name);
1376 : return 0;
1377 : }
1378 :
1379 5 : static int platform_probe(struct device *_dev)
1380 : {
1381 5 : struct platform_driver *drv = to_platform_driver(_dev->driver);
1382 5 : struct platform_device *dev = to_platform_device(_dev);
1383 : int ret;
1384 :
1385 : /*
1386 : * A driver registered using platform_driver_probe() cannot be bound
1387 : * again later because the probe function usually lives in __init code
1388 : * and so is gone. For these drivers .probe is set to
1389 : * platform_probe_fail in __platform_driver_probe(). Don't even prepare
1390 : * clocks and PM domains for these to match the traditional behaviour.
1391 : */
1392 5 : if (unlikely(drv->probe == platform_probe_fail))
1393 : return -ENXIO;
1394 :
1395 5 : ret = of_clk_set_defaults(_dev->of_node, false);
1396 : if (ret < 0)
1397 : return ret;
1398 :
1399 5 : ret = dev_pm_domain_attach(_dev, true);
1400 5 : if (ret)
1401 : goto out;
1402 :
1403 5 : if (drv->probe) {
1404 5 : ret = drv->probe(dev);
1405 5 : if (ret)
1406 0 : dev_pm_domain_detach(_dev, true);
1407 : }
1408 :
1409 : out:
1410 5 : if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
1411 0 : dev_warn(_dev, "probe deferral not supported\n");
1412 0 : ret = -ENXIO;
1413 : }
1414 :
1415 : return ret;
1416 : }
1417 :
1418 5 : static void platform_remove(struct device *_dev)
1419 : {
1420 5 : struct platform_driver *drv = to_platform_driver(_dev->driver);
1421 5 : struct platform_device *dev = to_platform_device(_dev);
1422 :
1423 5 : if (drv->remove_new) {
1424 0 : drv->remove_new(dev);
1425 5 : } else if (drv->remove) {
1426 0 : int ret = drv->remove(dev);
1427 :
1428 0 : if (ret)
1429 0 : dev_warn(_dev, "remove callback returned a non-zero value. This will be ignored.\n");
1430 : }
1431 5 : dev_pm_domain_detach(_dev, true);
1432 5 : }
1433 :
1434 0 : static void platform_shutdown(struct device *_dev)
1435 : {
1436 0 : struct platform_device *dev = to_platform_device(_dev);
1437 : struct platform_driver *drv;
1438 :
1439 0 : if (!_dev->driver)
1440 : return;
1441 :
1442 0 : drv = to_platform_driver(_dev->driver);
1443 0 : if (drv->shutdown)
1444 0 : drv->shutdown(dev);
1445 : }
1446 :
1447 5 : static int platform_dma_configure(struct device *dev)
1448 : {
1449 5 : struct platform_driver *drv = to_platform_driver(dev->driver);
1450 : enum dev_dma_attr attr;
1451 5 : int ret = 0;
1452 :
1453 : if (dev->of_node) {
1454 : ret = of_dma_configure(dev, dev->of_node, true);
1455 : } else if (has_acpi_companion(dev)) {
1456 : attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
1457 : ret = acpi_dma_configure(dev, attr);
1458 : }
1459 :
1460 : if (!ret && !drv->driver_managed_dma) {
1461 : ret = iommu_device_use_default_domain(dev);
1462 : if (ret)
1463 : arch_teardown_dma_ops(dev);
1464 : }
1465 :
1466 5 : return ret;
1467 : }
1468 :
1469 5 : static void platform_dma_cleanup(struct device *dev)
1470 : {
1471 5 : struct platform_driver *drv = to_platform_driver(dev->driver);
1472 :
1473 : if (!drv->driver_managed_dma)
1474 : iommu_device_unuse_default_domain(dev);
1475 5 : }
1476 :
1477 : static const struct dev_pm_ops platform_dev_pm_ops = {
1478 : SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend, pm_generic_runtime_resume, NULL)
1479 : USE_PLATFORM_PM_SLEEP_OPS
1480 : };
1481 :
1482 : struct bus_type platform_bus_type = {
1483 : .name = "platform",
1484 : .dev_groups = platform_dev_groups,
1485 : .match = platform_match,
1486 : .uevent = platform_uevent,
1487 : .probe = platform_probe,
1488 : .remove = platform_remove,
1489 : .shutdown = platform_shutdown,
1490 : .dma_configure = platform_dma_configure,
1491 : .dma_cleanup = platform_dma_cleanup,
1492 : .pm = &platform_dev_pm_ops,
1493 : };
1494 : EXPORT_SYMBOL_GPL(platform_bus_type);
1495 :
1496 0 : static inline int __platform_match(struct device *dev, const void *drv)
1497 : {
1498 0 : return platform_match(dev, (struct device_driver *)drv);
1499 : }
1500 :
1501 : /**
1502 : * platform_find_device_by_driver - Find a platform device with a given
1503 : * driver.
1504 : * @start: The device to start the search from.
1505 : * @drv: The device driver to look for.
1506 : */
1507 0 : struct device *platform_find_device_by_driver(struct device *start,
1508 : const struct device_driver *drv)
1509 : {
1510 0 : return bus_find_device(&platform_bus_type, start, drv,
1511 : __platform_match);
1512 : }
1513 : EXPORT_SYMBOL_GPL(platform_find_device_by_driver);
1514 :
1515 1 : void __weak __init early_platform_cleanup(void) { }
1516 :
1517 1 : int __init platform_bus_init(void)
1518 : {
1519 : int error;
1520 :
1521 1 : early_platform_cleanup();
1522 :
1523 1 : error = device_register(&platform_bus);
1524 1 : if (error) {
1525 0 : put_device(&platform_bus);
1526 0 : return error;
1527 : }
1528 1 : error = bus_register(&platform_bus_type);
1529 1 : if (error)
1530 0 : device_unregister(&platform_bus);
1531 : of_platform_register_reconfig_notifier();
1532 : return error;
1533 : }
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