1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ACPI support for platform bus type. 4 * 5 * Copyright (C) 2012, Intel Corporation 6 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> 7 * Mathias Nyman <mathias.nyman@linux.intel.com> 8 * Rafael J. Wysocki <rafael.j.wysocki@intel.com> 9 */ 10 11 #include <linux/acpi.h> 12 #include <linux/device.h> 13 #include <linux/err.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/pci.h> 18 #include <linux/platform_device.h> 19 20 #include "internal.h" 21 22 ACPI_MODULE_NAME("platform"); 23 24 static const struct acpi_device_id forbidden_id_list[] = { 25 {"PNP0000", 0}, /* PIC */ 26 {"PNP0100", 0}, /* Timer */ 27 {"PNP0200", 0}, /* AT DMA Controller */ 28 {"ACPI0009", 0}, /* IOxAPIC */ 29 {"ACPI000A", 0}, /* IOAPIC */ 30 {"SMB0001", 0}, /* ACPI SMBUS virtual device */ 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 = kcalloc(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 set_dev_node(&pdev->dev, acpi_get_node(adev->handle)); 124 dev_dbg(&adev->dev, "created platform device %s\n", 125 dev_name(&pdev->dev)); 126 } 127 128 kfree(resources); 129 130 return pdev; 131 } 132 EXPORT_SYMBOL_GPL(acpi_create_platform_device); 133