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 
29 struct device platform_bus = {
30 	.init_name	= "platform",
31 };
32 EXPORT_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  */
arch_setup_pdev_archdata(struct platform_device * pdev)49 void __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  */
platform_get_resource(struct platform_device * dev,unsigned int type,unsigned int num)59 struct 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 }
72 EXPORT_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  */
platform_get_irq(struct platform_device * dev,unsigned int num)79 int 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 }
85 EXPORT_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  */
platform_get_resource_byname(struct platform_device * dev,unsigned int type,const char * name)93 struct 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 }
107 EXPORT_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  */
platform_get_irq_byname(struct platform_device * dev,const char * name)114 int 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 }
121 EXPORT_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  */
platform_add_devices(struct platform_device ** devs,int num)128 int 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 }
143 EXPORT_SYMBOL_GPL(platform_add_devices);
144 
145 struct 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  */
platform_device_put(struct platform_device * pdev)157 void platform_device_put(struct platform_device *pdev)
158 {
159 	if (pdev)
160 		put_device(&pdev->dev);
161 }
162 EXPORT_SYMBOL_GPL(platform_device_put);
163 
platform_device_release(struct device * dev)164 static 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  */
platform_device_alloc(const char * name,int id)184 struct 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 }
200 EXPORT_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  */
platform_device_add_resources(struct platform_device * pdev,const struct resource * res,unsigned int num)212 int 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 }
228 EXPORT_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  */
platform_device_add_data(struct platform_device * pdev,const void * data,size_t size)240 int 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 }
255 EXPORT_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  */
platform_device_add(struct platform_device * pdev)264 int 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 }
322 EXPORT_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  */
platform_device_del(struct platform_device * pdev)332 void 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 }
348 EXPORT_SYMBOL_GPL(platform_device_del);
349 
350 /**
351  * platform_device_register - add a platform-level device
352  * @pdev: platform device we're adding
353  */
platform_device_register(struct platform_device * pdev)354 int 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 }
360 EXPORT_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  */
platform_device_unregister(struct platform_device * pdev)370 void platform_device_unregister(struct platform_device *pdev)
371 {
372 	platform_device_del(pdev);
373 	platform_device_put(pdev);
374 }
375 EXPORT_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  */
platform_device_register_full(const struct platform_device_info * pdevinfo)385 struct 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) {
425 err:
426 		kfree(pdev->dev.dma_mask);
427 
428 err_alloc:
429 		platform_device_put(pdev);
430 		return ERR_PTR(ret);
431 	}
432 
433 	return pdev;
434 }
435 EXPORT_SYMBOL_GPL(platform_device_register_full);
436 
platform_drv_probe(struct device * _dev)437 static 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 
platform_drv_probe_fail(struct device * _dev)445 static int platform_drv_probe_fail(struct device *_dev)
446 {
447 	return -ENXIO;
448 }
449 
platform_drv_remove(struct device * _dev)450 static 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 
platform_drv_shutdown(struct device * _dev)458 static 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  */
platform_driver_register(struct platform_driver * drv)470 int 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 }
482 EXPORT_SYMBOL_GPL(platform_driver_register);
483 
484 /**
485  * platform_driver_unregister - unregister a driver for platform-level devices
486  * @drv: platform driver structure
487  */
platform_driver_unregister(struct platform_driver * drv)488 void platform_driver_unregister(struct platform_driver *drv)
489 {
490 	driver_unregister(&drv->driver);
491 }
492 EXPORT_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  */
platform_driver_probe(struct platform_driver * drv,int (* probe)(struct platform_device *))511 int __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 }
540 EXPORT_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  */
platform_create_bundle(struct platform_driver * driver,int (* probe)(struct platform_device *),struct resource * res,unsigned int n_res,const void * data,size_t size)556 struct 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 
589 err_pdev_del:
590 	platform_device_del(pdev);
591 err_pdev_put:
592 	platform_device_put(pdev);
593 err_out:
594 	return ERR_PTR(error);
595 }
596 EXPORT_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  */
modalias_show(struct device * dev,struct device_attribute * a,char * buf)604 static 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 
613 static struct device_attribute platform_dev_attrs[] = {
614 	__ATTR_RO(modalias),
615 	__ATTR_NULL,
616 };
617 
platform_uevent(struct device * dev,struct kobj_uevent_env * env)618 static 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 
platform_match_id(const struct platform_device_id * id,struct platform_device * pdev)633 static 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  */
platform_match(struct device * dev,struct device_driver * drv)660 static 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 
platform_legacy_suspend(struct device * dev,pm_message_t mesg)679 static 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 
platform_legacy_resume(struct device * dev)691 static 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 
platform_pm_suspend(struct device * dev)707 int 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 
platform_pm_resume(struct device * dev)725 int 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 
platform_pm_freeze(struct device * dev)747 int 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 
platform_pm_thaw(struct device * dev)765 int 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 
platform_pm_poweroff(struct device * dev)783 int 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 
platform_pm_restore(struct device * dev)801 int 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 
821 static 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 
828 struct 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 };
835 EXPORT_SYMBOL_GPL(platform_bus_type);
836 
platform_bus_init(void)837 int __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
dma_get_required_mask(struct device * dev)853 u64 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 }
871 EXPORT_SYMBOL_GPL(dma_get_required_mask);
872 #endif
873 
874 static __initdata LIST_HEAD(early_platform_driver_list);
875 static __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  */
early_platform_driver_register(struct early_platform_driver * epdrv,char * buf)884 int __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  */
early_platform_add_devices(struct platform_device ** devs,int num)941 void __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  */
early_platform_driver_register_all(char * class_str)966 void __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  */
990 static  __init struct platform_device *
early_platform_match(struct early_platform_driver * epdrv,int id)991 early_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  */
early_platform_left(struct early_platform_driver * epdrv,int id)1008 static  __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  */
early_platform_driver_probe_id(char * class_str,int id,int nr_probe)1027 static 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  */
early_platform_driver_probe(char * class_str,int nr_probe,int user_only)1121 int __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  */
early_platform_cleanup(void)1146 void __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 
1158