LXR linux/drivers/acpi/acpi

   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);
 135