platform.c

/*
 * platform.c - platform 'pseudo' bus for legacy devices
 *
 * Copyright (c) 2002-3 Patrick Mochel
 * Copyright (c) 2002-3 Open Source Development Labs
 *
 * This file is released under the GPLv2
 *
 * Please see Documentation/driver-model/platform.txt for more
 * information.
 */

#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/idr.h>

#include "base.h"
#include "power/power.h"

/* For automatically allocated device IDs */
static DEFINE_IDA(platform_devid_ida);

#define to_platform_driver(drv)	(container_of((drv), struct platform_driver, \
				 driver))

struct device platform_bus = {
	.init_name	= "platform",
};
EXPORT_SYMBOL_GPL(platform_bus);

/**
 * arch_setup_pdev_archdata - Allow manipulation of archdata before its used
 * @pdev: platform device
 *
 * This is called before platform_device_add() such that any pdev_archdata may
 * be setup before the platform_notifier is called.  So if a user needs to
 * manipulate any relevant information in the pdev_archdata they can do:
 *
 *	platform_device_alloc()
 * 	... manipulate ...
 * 	platform_device_add()
 *
 * And if they don't care they can just call platform_device_register() and
 * everything will just work out.
 */
void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
{
}

/**
 * platform_get_resource - get a resource for a device
 * @dev: platform device
 * @type: resource type
 * @num: resource index
 */
struct resource *platform_get_resource(struct platform_device *dev,
				       unsigned int type, unsigned int num)
{
	int i;

	for (i = 0; i < dev->num_resources; i++) {
		struct resource *r = &dev->resource[i];