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