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 * 54 * Check if the given @adev can be represented as a platform device and, if 55 * that's the case, create and register a platform device, populate its common 56 * resources and returns a pointer to it. Otherwise, return %NULL. 57 * 58 * Name of the platform device will be the same as @adev's. 59 */ 60 struct platform_device *acpi_create_platform_device(struct acpi_device *adev) 61 { 62 struct platform_device *pdev = NULL; 63 struct platform_device_info pdevinfo; 64 struct resource_entry *rentry; 65 struct list_head resource_list; 66 struct resource *resources = NULL; 67 int count; 68 69 /* If the ACPI node already has a physical device attached, skip it. */ 70 if (adev->physical_node_count) 71 return NULL; 72 73 if (!acpi_match_device_ids(adev, forbidden_id_list)) 74 return ERR_PTR(-EINVAL); 75 76 INIT_LIST_HEAD(&resource_list); 77 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); 78 if (count < 0) { 79 return NULL; 80 } else if (count > 0) { 81 resources = kzalloc(count * sizeof(struct resource), 82 GFP_KERNEL); 83 if (!resources) { 84 dev_err(&adev->dev, "No memory for resources\n"); 85 acpi_dev_free_resource_list(&resource_list); 86 return ERR_PTR(-ENOMEM); 87 } 88 count = 0; 89 list_for_each_entry(rentry, &resource_list, node) 90 acpi_platform_fill_resource(adev, rentry->res, 91 &resources[count++]); 92 93 acpi_dev_free_resource_list(&resource_list); 94 } 95 96 memset(&pdevinfo, 0, sizeof(pdevinfo)); 97 /* 98 * If the ACPI node has a parent and that parent has a physical device 99 * attached to it, that physical device should be the parent of the 100 * platform device we are about to create. 101 */ 102 pdevinfo.parent = adev->parent ? 103 acpi_get_first_physical_node(adev->parent) : NULL; 104 pdevinfo.name = dev_name(&adev->dev); 105 pdevinfo.id = -1; 106 pdevinfo.res = resources; 107 pdevinfo.num_res = count; 108 pdevinfo.fwnode = acpi_fwnode_handle(adev); 109 110 if (acpi_dma_supported(adev)) 111 pdevinfo.dma_mask = DMA_BIT_MASK(32); 112 else 113 pdevinfo.dma_mask = 0; 114 115 pdev = platform_device_register_full(&pdevinfo); 116 if (IS_ERR(pdev)) 117 dev_err(&adev->dev, "platform device creation failed: %ld\n", 118 PTR_ERR(pdev)); 119 else 120 dev_dbg(&adev->dev, "created platform device %s\n", 121 dev_name(&pdev->dev)); 122 123 kfree(resources); 124 return pdev; 125 } 126 EXPORT_SYMBOL_GPL(acpi_create_platform_device); 127