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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 platform_device_info pdevinfo;
 47         struct resource_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 = kzalloc(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 = adev->parent ?
 85                 acpi_get_first_physical_node(adev->parent) : NULL;
 86         pdevinfo.name = dev_name(&adev->dev);
 87         pdevinfo.id = -1;
 88         pdevinfo.res = resources;
 89         pdevinfo.num_res = count;
 90         pdevinfo.fwnode = acpi_fwnode_handle(adev);
 91 
 92         if (acpi_dma_supported(adev))
 93                 pdevinfo.dma_mask = DMA_BIT_MASK(32);
 94         else
 95                 pdevinfo.dma_mask = 0;
 96 
 97         pdev = platform_device_register_full(&pdevinfo);
 98         if (IS_ERR(pdev))
 99                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
100                         PTR_ERR(pdev));
101         else
102                 dev_dbg(&adev->dev, "created platform device %s\n",
103                         dev_name(&pdev->dev));
104 
105         kfree(resources);
106         return pdev;
107 }
108 EXPORT_SYMBOL_GPL(acpi_create_platform_device);
109 

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