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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/dma-mapping.h>
 20 #include <linux/platform_device.h>
 21 
 22 #include "internal.h"
 23 
 24 ACPI_MODULE_NAME("platform");
 25 
 26 static 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  */
 43 struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
 44 {
 45         struct platform_device *pdev = NULL;
 46         struct acpi_device *acpi_parent;
 47         struct platform_device_info pdevinfo;
 48         struct resource_list_entry *rentry;
 49         struct list_head resource_list;
 50         struct resource *resources = NULL;
 51         int count;
 52 
 53         /* If the ACPI node already has a physical device attached, skip it. */
 54         if (adev->physical_node_count)
 55                 return NULL;
 56 
 57         if (!acpi_match_device_ids(adev, forbidden_id_list))
 58                 return ERR_PTR(-EINVAL);
 59 
 60         INIT_LIST_HEAD(&resource_list);
 61         count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
 62         if (count < 0) {
 63                 return NULL;
 64         } else if (count > 0) {
 65                 resources = kmalloc(count * sizeof(struct resource),
 66                                     GFP_KERNEL);
 67                 if (!resources) {
 68                         dev_err(&adev->dev, "No memory for resources\n");
 69                         acpi_dev_free_resource_list(&resource_list);
 70                         return ERR_PTR(-ENOMEM);
 71                 }
 72                 count = 0;
 73                 list_for_each_entry(rentry, &resource_list, node)
 74                         resources[count++] = rentry->res;
 75 
 76                 acpi_dev_free_resource_list(&resource_list);
 77         }
 78 
 79         memset(&pdevinfo, 0, sizeof(pdevinfo));
 80         /*
 81          * If the ACPI node has a parent and that parent has a physical device
 82          * attached to it, that physical device should be the parent of the
 83          * platform device we are about to create.
 84          */
 85         pdevinfo.parent = NULL;
 86         acpi_parent = adev->parent;
 87         if (acpi_parent) {
 88                 struct acpi_device_physical_node *entry;
 89                 struct list_head *list;
 90 
 91                 mutex_lock(&acpi_parent->physical_node_lock);
 92                 list = &acpi_parent->physical_node_list;
 93                 if (!list_empty(list)) {
 94                         entry = list_first_entry(list,
 95                                         struct acpi_device_physical_node,
 96                                         node);
 97                         pdevinfo.parent = entry->dev;
 98                 }
 99                 mutex_unlock(&acpi_parent->physical_node_lock);
100         }
101         pdevinfo.name = dev_name(&adev->dev);
102         pdevinfo.id = -1;
103         pdevinfo.res = resources;
104         pdevinfo.num_res = count;
105         pdevinfo.acpi_node.companion = adev;
106         pdevinfo.dma_mask = DMA_BIT_MASK(32);
107         pdev = platform_device_register_full(&pdevinfo);
108         if (IS_ERR(pdev))
109                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
110                         PTR_ERR(pdev));
111         else
112                 dev_dbg(&adev->dev, "created platform device %s\n",
113                         dev_name(&pdev->dev));
114 
115         kfree(resources);
116         return pdev;
117 }
118 EXPORT_SYMBOL_GPL(acpi_create_platform_device);
119 

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