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48459340b9
Because of the growing demand for enumerating ACPI devices to
platform bus, change the code to enumerate ACPI device objects to
platform bus by default. Namely, create platform devices for the
ACPI device objects that
1. Have pnp.type.platform_id set (device objects with _HID currently).
2. Do not have a scan handler attached.
3. Are not SPI/I2C slave devices (that should be enumerated to the
appropriate buses bus by their parent).
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[rjw: Subject and changelog, rebase and code cleanup]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/platform_device.h>
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#include "internal.h"
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ACPI_MODULE_NAME("platform");
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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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{"", 0},
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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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*
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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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{
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struct platform_device *pdev = NULL;
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struct acpi_device *acpi_parent;
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struct platform_device_info pdevinfo;
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struct resource_list_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 = kmalloc(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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resources[count++] = rentry->res;
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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 = NULL;
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acpi_parent = adev->parent;
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if (acpi_parent) {
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struct acpi_device_physical_node *entry;
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struct list_head *list;
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mutex_lock(&acpi_parent->physical_node_lock);
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list = &acpi_parent->physical_node_list;
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if (!list_empty(list)) {
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entry = list_first_entry(list,
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struct acpi_device_physical_node,
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node);
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pdevinfo.parent = entry->dev;
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}
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mutex_unlock(&acpi_parent->physical_node_lock);
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}
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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.acpi_node.companion = adev;
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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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dev_dbg(&adev->dev, "created platform device %s\n",
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dev_name(&pdev->dev));
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kfree(resources);
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return pdev;
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}
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