| /* |
| * ACPI support for platform bus type. |
| * |
| * Copyright (C) 2012, Intel Corporation |
| * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> |
| * Mathias Nyman <mathias.nyman@linux.intel.com> |
| * Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/platform_device.h> |
| |
| #include "internal.h" |
| |
| ACPI_MODULE_NAME("platform"); |
| |
| static const struct acpi_device_id forbidden_id_list[] = { |
| {"PNP0000", 0}, /* PIC */ |
| {"PNP0100", 0}, /* Timer */ |
| {"PNP0200", 0}, /* AT DMA Controller */ |
| {"ACPI0009", 0}, /* IOxAPIC */ |
| {"ACPI000A", 0}, /* IOAPIC */ |
| {"", 0}, |
| }; |
| |
| /** |
| * acpi_create_platform_device - Create platform device for ACPI device node |
| * @adev: ACPI device node to create a platform device for. |
| * |
| * Check if the given @adev can be represented as a platform device and, if |
| * that's the case, create and register a platform device, populate its common |
| * resources and returns a pointer to it. Otherwise, return %NULL. |
| * |
| * Name of the platform device will be the same as @adev's. |
| */ |
| struct platform_device *acpi_create_platform_device(struct acpi_device *adev) |
| { |
| struct platform_device *pdev = NULL; |
| struct acpi_device *acpi_parent; |
| struct platform_device_info pdevinfo; |
| struct resource_entry *rentry; |
| struct list_head resource_list; |
| struct resource *resources = NULL; |
| int count; |
| |
| /* If the ACPI node already has a physical device attached, skip it. */ |
| if (adev->physical_node_count) |
| return NULL; |
| |
| if (!acpi_match_device_ids(adev, forbidden_id_list)) |
| return ERR_PTR(-EINVAL); |
| |
| INIT_LIST_HEAD(&resource_list); |
| count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); |
| if (count < 0) { |
| return NULL; |
| } else if (count > 0) { |
| resources = kmalloc(count * sizeof(struct resource), |
| GFP_KERNEL); |
| if (!resources) { |
| dev_err(&adev->dev, "No memory for resources\n"); |
| acpi_dev_free_resource_list(&resource_list); |
| return ERR_PTR(-ENOMEM); |
| } |
| count = 0; |
| list_for_each_entry(rentry, &resource_list, node) |
| resources[count++] = *rentry->res; |
| |
| acpi_dev_free_resource_list(&resource_list); |
| } |
| |
| memset(&pdevinfo, 0, sizeof(pdevinfo)); |
| /* |
| * If the ACPI node has a parent and that parent has a physical device |
| * attached to it, that physical device should be the parent of the |
| * platform device we are about to create. |
| */ |
| pdevinfo.parent = NULL; |
| acpi_parent = adev->parent; |
| if (acpi_parent) { |
| struct acpi_device_physical_node *entry; |
| struct list_head *list; |
| |
| mutex_lock(&acpi_parent->physical_node_lock); |
| list = &acpi_parent->physical_node_list; |
| if (!list_empty(list)) { |
| entry = list_first_entry(list, |
| struct acpi_device_physical_node, |
| node); |
| pdevinfo.parent = entry->dev; |
| } |
| mutex_unlock(&acpi_parent->physical_node_lock); |
| } |
| pdevinfo.name = dev_name(&adev->dev); |
| pdevinfo.id = -1; |
| pdevinfo.res = resources; |
| pdevinfo.num_res = count; |
| pdevinfo.fwnode = acpi_fwnode_handle(adev); |
| |
| if (acpi_dma_supported(adev)) |
| pdevinfo.dma_mask = DMA_BIT_MASK(32); |
| else |
| pdevinfo.dma_mask = 0; |
| |
| pdev = platform_device_register_full(&pdevinfo); |
| if (IS_ERR(pdev)) |
| dev_err(&adev->dev, "platform device creation failed: %ld\n", |
| PTR_ERR(pdev)); |
| else |
| dev_dbg(&adev->dev, "created platform device %s\n", |
| dev_name(&pdev->dev)); |
| |
| kfree(resources); |
| return pdev; |
| } |
| EXPORT_SYMBOL_GPL(acpi_create_platform_device); |