/* * 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 */ {"", 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);