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da5b64329d
ACPI_MODULE_NAME() is not used in the acpi_platform.c, remove it. Signed-off-by: Hanjun Guo <guohanjun@huawei.com> [ rjw: Subject edit ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
173 lines
4.7 KiB
C
173 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ACPI support for platform bus type.
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*
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* Copyright (C) 2012, Intel Corporation
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Mathias Nyman <mathias.nyman@linux.intel.com>
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* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include "internal.h"
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static const struct acpi_device_id forbidden_id_list[] = {
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{"PNP0000", 0}, /* PIC */
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{"PNP0100", 0}, /* Timer */
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{"PNP0200", 0}, /* AT DMA Controller */
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{"ACPI0009", 0}, /* IOxAPIC */
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{"ACPI000A", 0}, /* IOAPIC */
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{"SMB0001", 0}, /* ACPI SMBUS virtual device */
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{"", 0},
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};
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static struct platform_device *acpi_platform_device_find_by_companion(struct acpi_device *adev)
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{
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struct device *dev;
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dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev);
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return dev ? to_platform_device(dev) : NULL;
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}
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static int acpi_platform_device_remove_notify(struct notifier_block *nb,
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unsigned long value, void *arg)
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{
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struct acpi_device *adev = arg;
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struct platform_device *pdev;
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switch (value) {
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case ACPI_RECONFIG_DEVICE_ADD:
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/* Nothing to do here */
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break;
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case ACPI_RECONFIG_DEVICE_REMOVE:
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if (!acpi_device_enumerated(adev))
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break;
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pdev = acpi_platform_device_find_by_companion(adev);
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if (!pdev)
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break;
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platform_device_unregister(pdev);
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put_device(&pdev->dev);
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block acpi_platform_notifier = {
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.notifier_call = acpi_platform_device_remove_notify,
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};
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static void acpi_platform_fill_resource(struct acpi_device *adev,
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const struct resource *src, struct resource *dest)
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{
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struct device *parent;
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*dest = *src;
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/*
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* If the device has parent we need to take its resources into
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* account as well because this device might consume part of those.
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*/
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parent = acpi_get_first_physical_node(adev->parent);
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if (parent && dev_is_pci(parent))
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dest->parent = pci_find_resource(to_pci_dev(parent), dest);
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}
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/**
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* acpi_create_platform_device - Create platform device for ACPI device node
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* @adev: ACPI device node to create a platform device for.
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* @properties: Optional collection of build-in properties.
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*
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* Check if the given @adev can be represented as a platform device and, if
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* that's the case, create and register a platform device, populate its common
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* resources and returns a pointer to it. Otherwise, return %NULL.
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*
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* Name of the platform device will be the same as @adev's.
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*/
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struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
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struct property_entry *properties)
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{
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struct platform_device *pdev = NULL;
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struct platform_device_info pdevinfo;
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struct resource_entry *rentry;
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struct list_head resource_list;
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struct resource *resources = NULL;
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int count;
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/* If the ACPI node already has a physical device attached, skip it. */
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if (adev->physical_node_count)
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return NULL;
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if (!acpi_match_device_ids(adev, forbidden_id_list))
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return ERR_PTR(-EINVAL);
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INIT_LIST_HEAD(&resource_list);
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count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
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if (count < 0) {
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return NULL;
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} else if (count > 0) {
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resources = kcalloc(count, sizeof(struct resource),
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GFP_KERNEL);
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if (!resources) {
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dev_err(&adev->dev, "No memory for resources\n");
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acpi_dev_free_resource_list(&resource_list);
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return ERR_PTR(-ENOMEM);
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}
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count = 0;
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list_for_each_entry(rentry, &resource_list, node)
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acpi_platform_fill_resource(adev, rentry->res,
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&resources[count++]);
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acpi_dev_free_resource_list(&resource_list);
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}
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memset(&pdevinfo, 0, sizeof(pdevinfo));
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/*
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* If the ACPI node has a parent and that parent has a physical device
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* attached to it, that physical device should be the parent of the
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* platform device we are about to create.
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*/
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pdevinfo.parent = adev->parent ?
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acpi_get_first_physical_node(adev->parent) : NULL;
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pdevinfo.name = dev_name(&adev->dev);
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pdevinfo.id = -1;
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pdevinfo.res = resources;
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pdevinfo.num_res = count;
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pdevinfo.fwnode = acpi_fwnode_handle(adev);
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pdevinfo.properties = properties;
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if (acpi_dma_supported(adev))
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pdevinfo.dma_mask = DMA_BIT_MASK(32);
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else
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pdevinfo.dma_mask = 0;
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pdev = platform_device_register_full(&pdevinfo);
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if (IS_ERR(pdev))
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dev_err(&adev->dev, "platform device creation failed: %ld\n",
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PTR_ERR(pdev));
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else {
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set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
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dev_dbg(&adev->dev, "created platform device %s\n",
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dev_name(&pdev->dev));
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}
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kfree(resources);
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return pdev;
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}
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EXPORT_SYMBOL_GPL(acpi_create_platform_device);
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void __init acpi_platform_init(void)
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{
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acpi_reconfig_notifier_register(&acpi_platform_notifier);
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}
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