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Linux/drivers/acpi/acpi_platform.c

  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/platform_device.h>
 20 
 21 #include "internal.h"
 22 
 23 ACPI_MODULE_NAME("platform");
 24 
 25 static const struct acpi_device_id forbidden_id_list[] = {
 26         {"PNP0000", 0}, /* PIC */
 27         {"PNP0100", 0}, /* Timer */
 28         {"PNP0200", 0}, /* AT DMA Controller */
 29         {"", 0},
 30 };
 31 
 32 /**
 33  * acpi_create_platform_device - Create platform device for ACPI device node
 34  * @adev: ACPI device node to create a platform device for.
 35  *
 36  * Check if the given @adev can be represented as a platform device and, if
 37  * that's the case, create and register a platform device, populate its common
 38  * resources and returns a pointer to it.  Otherwise, return %NULL.
 39  *
 40  * Name of the platform device will be the same as @adev's.
 41  */
 42 struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
 43 {
 44         struct platform_device *pdev = NULL;
 45         struct acpi_device *acpi_parent;
 46         struct platform_device_info pdevinfo;
 47         struct resource_list_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 = kmalloc(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 = NULL;
 85         acpi_parent = adev->parent;
 86         if (acpi_parent) {
 87                 struct acpi_device_physical_node *entry;
 88                 struct list_head *list;
 89 
 90                 mutex_lock(&acpi_parent->physical_node_lock);
 91                 list = &acpi_parent->physical_node_list;
 92                 if (!list_empty(list)) {
 93                         entry = list_first_entry(list,
 94                                         struct acpi_device_physical_node,
 95                                         node);
 96                         pdevinfo.parent = entry->dev;
 97                 }
 98                 mutex_unlock(&acpi_parent->physical_node_lock);
 99         }
100         pdevinfo.name = dev_name(&adev->dev);
101         pdevinfo.id = -1;
102         pdevinfo.res = resources;
103         pdevinfo.num_res = count;
104         pdevinfo.acpi_node.companion = adev;
105         pdev = platform_device_register_full(&pdevinfo);
106         if (IS_ERR(pdev))
107                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
108                         PTR_ERR(pdev));
109         else
110                 dev_dbg(&adev->dev, "created platform device %s\n",
111                         dev_name(&pdev->dev));
112 
113         kfree(resources);
114         return pdev;
115 }
116 

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