linux/drivers/acpi/acpi_platform.c
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   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/kernel.h>
  17#include <linux/module.h>
  18#include <linux/platform_device.h>
  19
  20#include "internal.h"
  21
  22ACPI_MODULE_NAME("platform");
  23
  24/**
  25 * acpi_create_platform_device - Create platform device for ACPI device node
  26 * @adev: ACPI device node to create a platform device for.
  27 *
  28 * Check if the given @adev can be represented as a platform device and, if
  29 * that's the case, create and register a platform device, populate its common
  30 * resources and returns a pointer to it.  Otherwise, return %NULL.
  31 *
  32 * The platform device's name will be taken from the @adev's _HID and _UID.
  33 */
  34struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
  35{
  36        struct platform_device *pdev = NULL;
  37        struct acpi_device *acpi_parent;
  38        struct platform_device_info pdevinfo;
  39        struct resource_list_entry *rentry;
  40        struct list_head resource_list;
  41        struct resource *resources;
  42        int count;
  43
  44        /* If the ACPI node already has a physical device attached, skip it. */
  45        if (adev->physical_node_count)
  46                return NULL;
  47
  48        INIT_LIST_HEAD(&resource_list);
  49        count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
  50        if (count <= 0)
  51                return NULL;
  52
  53        resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
  54        if (!resources) {
  55                dev_err(&adev->dev, "No memory for resources\n");
  56                acpi_dev_free_resource_list(&resource_list);
  57                return NULL;
  58        }
  59        count = 0;
  60        list_for_each_entry(rentry, &resource_list, node)
  61                resources[count++] = rentry->res;
  62
  63        acpi_dev_free_resource_list(&resource_list);
  64
  65        memset(&pdevinfo, 0, sizeof(pdevinfo));
  66        /*
  67         * If the ACPI node has a parent and that parent has a physical device
  68         * attached to it, that physical device should be the parent of the
  69         * platform device we are about to create.
  70         */
  71        pdevinfo.parent = NULL;
  72        acpi_parent = adev->parent;
  73        if (acpi_parent) {
  74                struct acpi_device_physical_node *entry;
  75                struct list_head *list;
  76
  77                mutex_lock(&acpi_parent->physical_node_lock);
  78                list = &acpi_parent->physical_node_list;
  79                if (!list_empty(list)) {
  80                        entry = list_first_entry(list,
  81                                        struct acpi_device_physical_node,
  82                                        node);
  83                        pdevinfo.parent = entry->dev;
  84                }
  85                mutex_unlock(&acpi_parent->physical_node_lock);
  86        }
  87        pdevinfo.name = dev_name(&adev->dev);
  88        pdevinfo.id = -1;
  89        pdevinfo.res = resources;
  90        pdevinfo.num_res = count;
  91        pdevinfo.acpi_node.handle = adev->handle;
  92        pdev = platform_device_register_full(&pdevinfo);
  93        if (IS_ERR(pdev)) {
  94                dev_err(&adev->dev, "platform device creation failed: %ld\n",
  95                        PTR_ERR(pdev));
  96                pdev = NULL;
  97        } else {
  98                dev_dbg(&adev->dev, "created platform device %s\n",
  99                        dev_name(&pdev->dev));
 100        }
 101
 102        kfree(resources);
 103        return pdev;
 104}
 105
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