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/pci.h>
 21#include <linux/platform_device.h>
 22
 23#include "internal.h"
 24
 25ACPI_MODULE_NAME("platform");
 26
 27static const struct acpi_device_id forbidden_id_list[] = {
 28	{"PNP0000",  0},	/* PIC */
 29	{"PNP0100",  0},	/* Timer */
 30	{"PNP0200",  0},	/* AT DMA Controller */
 31	{"ACPI0009", 0},	/* IOxAPIC */
 32	{"ACPI000A", 0},	/* IOAPIC */
 33	{"", 0},
 34};
 35
 36static void acpi_platform_fill_resource(struct acpi_device *adev,
 37	const struct resource *src, struct resource *dest)
 38{
 39	struct device *parent;
 40
 41	*dest = *src;
 42
 43	/*
 44	 * If the device has parent we need to take its resources into
 45	 * account as well because this device might consume part of those.
 46	 */
 47	parent = acpi_get_first_physical_node(adev->parent);
 48	if (parent && dev_is_pci(parent))
 49		dest->parent = pci_find_resource(to_pci_dev(parent), dest);
 50}
 51
 52/**
 53 * acpi_create_platform_device - Create platform device for ACPI device node
 54 * @adev: ACPI device node to create a platform device for.
 55 * @properties: Optional collection of build-in properties.
 56 *
 57 * Check if the given @adev can be represented as a platform device and, if
 58 * that's the case, create and register a platform device, populate its common
 59 * resources and returns a pointer to it.  Otherwise, return %NULL.
 60 *
 61 * Name of the platform device will be the same as @adev's.
 62 */
 63struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
 64					struct property_entry *properties)
 65{
 66	struct platform_device *pdev = NULL;
 67	struct platform_device_info pdevinfo;
 68	struct resource_entry *rentry;
 69	struct list_head resource_list;
 70	struct resource *resources = NULL;
 71	int count;
 72
 73	/* If the ACPI node already has a physical device attached, skip it. */
 74	if (adev->physical_node_count)
 75		return NULL;
 76
 77	if (!acpi_match_device_ids(adev, forbidden_id_list))
 78		return ERR_PTR(-EINVAL);
 79
 80	INIT_LIST_HEAD(&resource_list);
 81	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
 82	if (count < 0) {
 83		return NULL;
 84	} else if (count > 0) {
 85		resources = kzalloc(count * sizeof(struct resource),
 86				    GFP_KERNEL);
 87		if (!resources) {
 88			dev_err(&adev->dev, "No memory for resources\n");
 89			acpi_dev_free_resource_list(&resource_list);
 90			return ERR_PTR(-ENOMEM);
 91		}
 92		count = 0;
 93		list_for_each_entry(rentry, &resource_list, node)
 94			acpi_platform_fill_resource(adev, rentry->res,
 95						    &resources[count++]);
 96
 97		acpi_dev_free_resource_list(&resource_list);
 98	}
 99
100	memset(&pdevinfo, 0, sizeof(pdevinfo));
101	/*
102	 * If the ACPI node has a parent and that parent has a physical device
103	 * attached to it, that physical device should be the parent of the
104	 * platform device we are about to create.
105	 */
106	pdevinfo.parent = adev->parent ?
107		acpi_get_first_physical_node(adev->parent) : NULL;
108	pdevinfo.name = dev_name(&adev->dev);
109	pdevinfo.id = -1;
110	pdevinfo.res = resources;
111	pdevinfo.num_res = count;
112	pdevinfo.fwnode = acpi_fwnode_handle(adev);
113	pdevinfo.properties = properties;
114
115	if (acpi_dma_supported(adev))
116		pdevinfo.dma_mask = DMA_BIT_MASK(32);
117	else
118		pdevinfo.dma_mask = 0;
119
120	pdev = platform_device_register_full(&pdevinfo);
121	if (IS_ERR(pdev))
122		dev_err(&adev->dev, "platform device creation failed: %ld\n",
123			PTR_ERR(pdev));
124	else {
125		set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
126		dev_dbg(&adev->dev, "created platform device %s\n",
127			dev_name(&pdev->dev));
128	}
129
130	kfree(resources);
131
132	return pdev;
133}
134EXPORT_SYMBOL_GPL(acpi_create_platform_device);