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 * @properties: Optional collection of build-in properties. 37 * 38 * Check if the given @adev can be represented as a platform device and, if 39 * that's the case, create and register a platform device, populate its common 40 * resources and returns a pointer to it. Otherwise, return %NULL. 41 * 42 * Name of the platform device will be the same as @adev's. 43 */ 44 struct platform_device *acpi_create_platform_device(struct acpi_device *adev, 45 struct property_entry *properties) 46 { 47 struct platform_device *pdev = NULL; 48 struct platform_device_info pdevinfo; 49 struct resource_entry *rentry; 50 struct list_head resource_list; 51 struct resource *resources = NULL; 52 int count; 53 54 /* If the ACPI node already has a physical device attached, skip it. */ 55 if (adev->physical_node_count) 56 return NULL; 57 58 if (!acpi_match_device_ids(adev, forbidden_id_list)) 59 return ERR_PTR(-EINVAL); 60 61 INIT_LIST_HEAD(&resource_list); 62 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); 63 if (count < 0) { 64 return NULL; 65 } else if (count > 0) { 66 resources = kzalloc(count * sizeof(struct resource), 67 GFP_KERNEL); 68 if (!resources) { 69 dev_err(&adev->dev, "No memory for resources\n"); 70 acpi_dev_free_resource_list(&resource_list); 71 return ERR_PTR(-ENOMEM); 72 } 73 count = 0; 74 list_for_each_entry(rentry, &resource_list, node) 75 resources[count++] = *rentry->res; 76 77 acpi_dev_free_resource_list(&resource_list); 78 } 79 80 memset(&pdevinfo, 0, sizeof(pdevinfo)); 81 /* 82 * If the ACPI node has a parent and that parent has a physical device 83 * attached to it, that physical device should be the parent of the 84 * platform device we are about to create. 85 */ 86 pdevinfo.parent = adev->parent ? 87 acpi_get_first_physical_node(adev->parent) : NULL; 88 pdevinfo.name = dev_name(&adev->dev); 89 pdevinfo.id = -1; 90 pdevinfo.res = resources; 91 pdevinfo.num_res = count; 92 pdevinfo.fwnode = acpi_fwnode_handle(adev); 93 pdevinfo.properties = properties; 94 95 if (acpi_dma_supported(adev)) 96 pdevinfo.dma_mask = DMA_BIT_MASK(32); 97 else 98 pdevinfo.dma_mask = 0; 99 100 pdev = platform_device_register_full(&pdevinfo); 101 if (IS_ERR(pdev)) 102 dev_err(&adev->dev, "platform device creation failed: %ld\n", 103 PTR_ERR(pdev)); 104 else 105 dev_dbg(&adev->dev, "created platform device %s\n", 106 dev_name(&pdev->dev)); 107 108 kfree(resources); 109 return pdev; 110 } 111 EXPORT_SYMBOL_GPL(acpi_create_platform_device); 112