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

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