/* * 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/platform_device.h> #include "internal.h" ACPI_MODULE_NAME("platform"); /* Flags for acpi_create_platform_device */ #define ACPI_PLATFORM_CLK BIT(0) /* * The following ACPI IDs are known to be suitable for representing as * platform devices. */ static const struct acpi_device_id acpi_platform_device_ids[] = { { "PNP0D40" }, /* Haswell LPSS devices */ { "INT33C0", ACPI_PLATFORM_CLK }, { "INT33C1", ACPI_PLATFORM_CLK }, { "INT33C2", ACPI_PLATFORM_CLK }, { "INT33C3", ACPI_PLATFORM_CLK }, { "INT33C4", ACPI_PLATFORM_CLK }, { "INT33C5", ACPI_PLATFORM_CLK }, { "INT33C6", ACPI_PLATFORM_CLK }, { "INT33C7", ACPI_PLATFORM_CLK }, { } }; static int acpi_create_platform_clks(struct acpi_device *adev) { static struct platform_device *pdev; /* Create Lynxpoint LPSS clocks */ if (!pdev && !strncmp(acpi_device_hid(adev), "INT33C", 6)) { pdev = platform_device_register_simple("clk-lpt", -1, NULL, 0); if (IS_ERR(pdev)) return PTR_ERR(pdev); } return 0; } /** * acpi_create_platform_device - Create platform device for ACPI device node * @adev: ACPI device node to create a platform device for. * @id: ACPI device ID used to match @adev. * * 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. */ static int acpi_create_platform_device(struct acpi_device *adev, const struct acpi_device_id *id) { unsigned long flags = id->driver_data; struct platform_device *pdev = NULL; struct acpi_device *acpi_parent; struct platform_device_info pdevinfo; struct resource_list_entry *rentry; struct list_head resource_list; struct resource *resources; int count; if (flags & ACPI_PLATFORM_CLK) { int ret = acpi_create_platform_clks(adev); if (ret) { dev_err(&adev->dev, "failed to create clocks\n"); return ret; } } /* If the ACPI node already has a physical device attached, skip it. */ if (adev->physical_node_count) return 0; INIT_LIST_HEAD(&resource_list); count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); if (count <= 0) return 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 -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.acpi_node.handle = adev->handle; pdev = platform_device_register_full(&pdevinfo); if (IS_ERR(pdev)) { dev_err(&adev->dev, "platform device creation failed: %ld\n", PTR_ERR(pdev)); pdev = NULL; } else { dev_dbg(&adev->dev, "created platform device %s\n", dev_name(&pdev->dev)); } kfree(resources); return 1; } static struct acpi_scan_handler platform_handler = { .ids = acpi_platform_device_ids, .attach = acpi_create_platform_device, }; void __init acpi_platform_init(void) { acpi_scan_add_handler(&platform_handler); }