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 {"ACPI0009", 0}, /* IOxAPIC */ 32 {"ACPI000A", 0}, /* IOAPIC */ 33 {"", 0}, 34 }; 35 36 static void acpi_platform_fill_resource(struct acpi_device *adev, 37 const struct resource *src, struct resource *dest) 38 { 39 struct device *parent; 40 41 *dest = *src; 42 43 /* 44 * If the device has parent we need to take its resources into 45 * account as well because this device might consume part of those. 46 */ 47 parent = acpi_get_first_physical_node(adev->parent); 48 if (parent && dev_is_pci(parent)) 49 dest->parent = pci_find_resource(to_pci_dev(parent), dest); 50 } 51 52 /** 53 * acpi_create_platform_device - Create platform device for ACPI device node 54 * @adev: ACPI device node to create a platform device for. 55 * @properties: Optional collection of build-in properties. 56 * 57 * Check if the given @adev can be represented as a platform device and, if 58 * that's the case, create and register a platform device, populate its common 59 * resources and returns a pointer to it. Otherwise, return %NULL. 60 * 61 * Name of the platform device will be the same as @adev's. 62 */ 63 struct platform_device *acpi_create_platform_device(struct acpi_device *adev, 64 struct property_entry *properties) 65 { 66 struct platform_device *pdev = NULL; 67 struct platform_device_info pdevinfo; 68 struct resource_entry *rentry; 69 struct list_head resource_list; 70 struct resource *resources = NULL; 71 int count; 72 73 /* If the ACPI node already has a physical device attached, skip it. */ 74 if (adev->physical_node_count) 75 return NULL; 76 77 if (!acpi_match_device_ids(adev, forbidden_id_list)) 78 return ERR_PTR(-EINVAL); 79 80 INIT_LIST_HEAD(&resource_list); 81 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); 82 if (count < 0) { 83 return NULL; 84 } else if (count > 0) { 85 resources = kcalloc(count, sizeof(struct resource), 86 GFP_KERNEL); 87 if (!resources) { 88 dev_err(&adev->dev, "No memory for resources\n"); 89 acpi_dev_free_resource_list(&resource_list); 90 return ERR_PTR(-ENOMEM); 91 } 92 count = 0; 93 list_for_each_entry(rentry, &resource_list, node) 94 acpi_platform_fill_resource(adev, rentry->res, 95 &resources[count++]); 96 97 acpi_dev_free_resource_list(&resource_list); 98 } 99 100 memset(&pdevinfo, 0, sizeof(pdevinfo)); 101 /* 102 * If the ACPI node has a parent and that parent has a physical device 103 * attached to it, that physical device should be the parent of the 104 * platform device we are about to create. 105 */ 106 pdevinfo.parent = adev->parent ? 107 acpi_get_first_physical_node(adev->parent) : NULL; 108 pdevinfo.name = dev_name(&adev->dev); 109 pdevinfo.id = -1; 110 pdevinfo.res = resources; 111 pdevinfo.num_res = count; 112 pdevinfo.fwnode = acpi_fwnode_handle(adev); 113 pdevinfo.properties = properties; 114 115 if (acpi_dma_supported(adev)) 116 pdevinfo.dma_mask = DMA_BIT_MASK(32); 117 else 118 pdevinfo.dma_mask = 0; 119 120 pdev = platform_device_register_full(&pdevinfo); 121 if (IS_ERR(pdev)) 122 dev_err(&adev->dev, "platform device creation failed: %ld\n", 123 PTR_ERR(pdev)); 124 else { 125 set_dev_node(&pdev->dev, acpi_get_node(adev->handle)); 126 dev_dbg(&adev->dev, "created platform device %s\n", 127 dev_name(&pdev->dev)); 128 } 129 130 kfree(resources); 131 132 return pdev; 133 } 134 EXPORT_SYMBOL_GPL(acpi_create_platform_device); 135