119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*
|
|
* 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_list_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.acpi_node.companion = adev;
|
|
pdevinfo.dma_mask = DMA_BIT_MASK(32);
|
|
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);
|