// SPDX-License-Identifier: GPL-2.0-only/* * 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> */ #include <linux/acpi.h>#include <linux/bits.h>#include <linux/device.h>#include <linux/err.h>#include <linux/ioport.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/dma-mapping.h>#include <linux/pci.h>#include <linux/platform_device.h> #include "internal.h" /* Exclude devices that have no _CRS resources provided */#define ACPI_ALLOW_WO_RESOURCES		BIT(0) static const struct acpi_device_id forbidden_id_list[] = {	{"ACPI0009", 0},	/* IOxAPIC */	{"ACPI000A", 0},	/* IOAPIC */	{"PNP0000",  0},	/* PIC */	{"PNP0100",  0},	/* Timer */	{"PNP0200",  0},	/* AT DMA Controller */	{ACPI_SMBUS_MS_HID,  ACPI_ALLOW_WO_RESOURCES},	/* ACPI SMBUS virtual device */	{ }}; static struct platform_device *acpi_platform_device_find_by_companion(struct acpi_device *adev){	struct device *dev; 	dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev);	return dev ? to_platform_device(dev) : NULL;} static int acpi_platform_device_remove_notify(struct notifier_block *nb,					      unsigned long value, void *arg){	struct acpi_device *adev = arg;	struct platform_device *pdev; 	switch (value) {	case ACPI_RECONFIG_DEVICE_ADD:		/* Nothing to do here */		break;	case ACPI_RECONFIG_DEVICE_REMOVE:		if (!acpi_device_enumerated(adev))			break; 		pdev = acpi_platform_device_find_by_companion(adev);		if (!pdev)			break; 		platform_device_unregister(pdev);		put_device(&pdev->dev);		break;	} 	return NOTIFY_OK;} static struct notifier_block acpi_platform_notifier = {	.notifier_call = acpi_platform_device_remove_notify,}; static unsigned int acpi_platform_adjust_resources(struct acpi_device *adev,						   struct resource *new_res,						   struct resource *resources,						   unsigned int count){	unsigned int i; 	if (!(new_res->flags & (IORESOURCE_IO | IORESOURCE_MEM)))		return count; 	for (i = 0; i < count; ) {		struct resource *res = &resources[i]; 		/*		 * Look for overlaps of resources of the same type that would		 * cause resource insertion to fail down the road.		 */		if (__resource_contains_unbound(res, new_res) ||		    __resource_contains_unbound(new_res, res) ||		    resource_type(new_res) != resource_type(res) ||		    !resource_union(new_res, res, new_res)) {			i++;			continue;		} 		dev_info(&adev->dev, "%pR expanded due to overlap\n", new_res);		/*		 * Eliminate the previously processed resource that overlapped		 * with the new one because it is not necessary any more.		 */		memmove(res, res + 1, (--count - i) * sizeof(*res));	} 	return count;} static void acpi_platform_fill_resource(struct device *parent,					const struct resource *src,					struct resource *dest){	*dest = *src;	/*	 * If the device has parent we need to take its resources into	 * account as well because this device might consume part of those.	 */	if (parent && dev_is_pci(parent))		dest->parent = pci_find_resource(to_pci_dev(parent), dest);} static unsigned int acpi_platform_resource_count(struct acpi_resource *ares, void *data){	bool *has_resources = data; 	*has_resources = true; 	return AE_CTRL_TERMINATE;} /** * acpi_create_platform_device - Create platform device for ACPI device node * @adev: ACPI device node to create a platform device for. * @properties: Optional collection of build-in properties. * * 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,						    const struct property_entry *properties){	struct acpi_device *p = acpi_dev_parent(adev);	struct device *parent __free(put_device) = acpi_bus_get_primary_device(p);	struct platform_device *pdev = NULL;	struct platform_device_info pdevinfo;	const struct acpi_device_id *match;	struct resource *resources = NULL;	int count = 0; 	/* If the ACPI node already has a physical device attached, skip it. */	if (adev->physical_node_count && !adev->pnp.type.backlight)		return NULL; 	match = acpi_match_acpi_device(forbidden_id_list, adev);	if (match) {		if (match->driver_data & ACPI_ALLOW_WO_RESOURCES) {			bool has_resources = false; 			acpi_walk_resources(adev->handle, METHOD_NAME__CRS,					    acpi_platform_resource_count, &has_resources);			if (has_resources)				return ERR_PTR(-EINVAL);		} else {			return ERR_PTR(-EINVAL);		}	} 	if (adev->device_type == ACPI_BUS_TYPE_DEVICE) {		LIST_HEAD(resource_list); 		count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);		if (count < 0)			return ERR_PTR(-ENODATA); 		if (count > 0) {			struct resource_entry *rentry; 			resources = kzalloc_objs(*resources, count);			if (!resources) {				acpi_dev_free_resource_list(&resource_list);				return ERR_PTR(-ENOMEM);			}			count = 0;			list_for_each_entry(rentry, &resource_list, node) {				count = acpi_platform_adjust_resources(adev,								       rentry->res,								       resources,								       count);				acpi_platform_fill_resource(parent, rentry->res,							    &resources[count++]);			}			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 = parent;	pdevinfo.name = dev_name(&adev->dev);	pdevinfo.id = PLATFORM_DEVID_NONE;	pdevinfo.res = resources;	pdevinfo.num_res = count;	pdevinfo.fwnode = acpi_fwnode_handle(adev);	pdevinfo.properties = properties; 	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 {		set_dev_node(&pdev->dev, acpi_get_node(adev->handle));		dev_dbg(&adev->dev, "created platform device %s\n",			dev_name(&pdev->dev));	} 	kfree(resources); 	return pdev;}EXPORT_SYMBOL_GPL(acpi_create_platform_device); void __init acpi_platform_init(void){	acpi_reconfig_notifier_register(&acpi_platform_notifier);}