1/*
  2 * ACPI support for platform bus type.
  3 *
  4 * Copyright (C) 2012, Intel Corporation
  5 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
  6 *          Mathias Nyman <mathias.nyman@linux.intel.com>
  7 *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  8 *
  9 * This program is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License version 2 as
 11 * published by the Free Software Foundation.
 12 */
 13
 14#include <linux/acpi.h>
 15#include <linux/device.h>
 16#include <linux/err.h>
 17#include <linux/kernel.h>
 18#include <linux/module.h>
 19#include <linux/dma-mapping.h>
 20#include <linux/platform_device.h>
 21
 22#include "internal.h"
 23
 24ACPI_MODULE_NAME("platform");
 25
 26static const struct acpi_device_id forbidden_id_list[] = {
 27	{"PNP0000", 0},	/* PIC */
 28	{"PNP0100", 0},	/* Timer */
 29	{"PNP0200", 0},	/* AT DMA Controller */
 30	{"", 0},
 31};
 32
 33/**
 34 * acpi_create_platform_device - Create platform device for ACPI device node
 35 * @adev: ACPI device node to create a platform device for.
 36 *
 37 * Check if the given @adev can be represented as a platform device and, if
 38 * that's the case, create and register a platform device, populate its common
 39 * resources and returns a pointer to it.  Otherwise, return %NULL.
 40 *
 41 * Name of the platform device will be the same as @adev's.
 42 */
 43struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
 44{
 45	struct platform_device *pdev = NULL;
 46	struct platform_device_info pdevinfo;
 47	struct resource_entry *rentry;
 48	struct list_head resource_list;
 49	struct resource *resources = NULL;
 50	int count;
 51
 52	/* If the ACPI node already has a physical device attached, skip it. */
 53	if (adev->physical_node_count)
 54		return NULL;
 55
 56	if (!acpi_match_device_ids(adev, forbidden_id_list))
 57		return ERR_PTR(-EINVAL);
 58
 59	INIT_LIST_HEAD(&resource_list);
 60	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
 61	if (count < 0) {
 62		return NULL;
 63	} else if (count > 0) {
 64		resources = kzalloc(count * sizeof(struct resource),
 65				    GFP_KERNEL);
 66		if (!resources) {
 67			dev_err(&adev->dev, "No memory for resources\n");
 68			acpi_dev_free_resource_list(&resource_list);
 69			return ERR_PTR(-ENOMEM);
 70		}
 71		count = 0;
 72		list_for_each_entry(rentry, &resource_list, node)
 73			resources[count++] = *rentry->res;
 74
 75		acpi_dev_free_resource_list(&resource_list);
 76	}
 77
 78	memset(&pdevinfo, 0, sizeof(pdevinfo));
 79	/*
 80	 * If the ACPI node has a parent and that parent has a physical device
 81	 * attached to it, that physical device should be the parent of the
 82	 * platform device we are about to create.
 83	 */
 84	pdevinfo.parent = adev->parent ?
 85		acpi_get_first_physical_node(adev->parent) : NULL;
 86	pdevinfo.name = dev_name(&adev->dev);
 87	pdevinfo.id = -1;
 88	pdevinfo.res = resources;
 89	pdevinfo.num_res = count;
 90	pdevinfo.fwnode = acpi_fwnode_handle(adev);
 91
 92	if (acpi_dma_supported(adev))
 93		pdevinfo.dma_mask = DMA_BIT_MASK(32);
 94	else
 95		pdevinfo.dma_mask = 0;
 96
 97	pdev = platform_device_register_full(&pdevinfo);
 98	if (IS_ERR(pdev))
 99		dev_err(&adev->dev, "platform device creation failed: %ld\n",
100			PTR_ERR(pdev));
101	else
102		dev_dbg(&adev->dev, "created platform device %s\n",
103			dev_name(&pdev->dev));
104
105	kfree(resources);
106	return pdev;
107}
108EXPORT_SYMBOL_GPL(acpi_create_platform_device);