[deliverable/linux.git] / drivers / acpi / acpi_platform.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/platform_device.h>

#include "internal.h"

ACPI_MODULE_NAME("platform");

/*
 * 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" },

	{ }
};

/**
 * 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.
 */
int acpi_create_platform_device(struct acpi_device *adev,
				const struct acpi_device_id *id)
{
	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 0;

	INIT_LIST_HEAD(&resource_list);
	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
	if (count < 0) {
		return 0;
	} 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 -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);
}
Commit	Line	Data
91e56878 MW	1	/*
	2	* ACPI support for platform bus type.
	3	*
	4	* Copyright (C) 2012, Intel Corporation
	5	* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
	6	* Mathias Nyman <mathias.nyman@linux.intel.com>
	7	* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/acpi.h>
	15	#include <linux/device.h>
e375325c	16	#include <linux/err.h>
91e56878 MW	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20
5923f986 AS	21	#include "internal.h"
5923f986 AS	22
91e56878 MW	23	ACPI_MODULE_NAME("platform");
91e56878 MW	24
141a297b RW	25	/*
	26	* The following ACPI IDs are known to be suitable for representing as
	27	* platform devices.
	28	*/
	29	static const struct acpi_device_id acpi_platform_device_ids[] = {
	30
	31	{ "PNP0D40" },
	32
141a297b RW	33	{ }
	34	};
	35
91e56878 MW	36	/**
	37	* acpi_create_platform_device - Create platform device for ACPI device node
	38	* @adev: ACPI device node to create a platform device for.
141a297b	39	* @id: ACPI device ID used to match @adev.
91e56878 MW	40	*
	41	* Check if the given @adev can be represented as a platform device and, if
	42	* that's the case, create and register a platform device, populate its common
	43	* resources and returns a pointer to it. Otherwise, return %NULL.
	44	*
7eaa2800	45	* Name of the platform device will be the same as @adev's.
91e56878	46	*/
f58b082a RW	47	int acpi_create_platform_device(struct acpi_device *adev,
f58b082a RW	48	const struct acpi_device_id *id)
91e56878 MW	49	{
	50	struct platform_device *pdev = NULL;
	51	struct acpi_device *acpi_parent;
863f9f30	52	struct platform_device_info pdevinfo;
8e345c99 RW	53	struct resource_list_entry *rentry;
8e345c99 RW	54	struct list_head resource_list;
62eb4b07	55	struct resource *resources = NULL;
8e345c99	56	int count;
91e56878 MW	57
	58	/* If the ACPI node already has a physical device attached, skip it. */
	59	if (adev->physical_node_count)
141a297b	60	return 0;
91e56878	61
8e345c99 RW	62	INIT_LIST_HEAD(&resource_list);
8e345c99 RW	63	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
d2fe7251	64	if (count < 0) {
141a297b	65	return 0;
d2fe7251 RW	66	} else if (count > 0) {
	67	resources = kmalloc(count * sizeof(struct resource),
	68	GFP_KERNEL);
	69	if (!resources) {
	70	dev_err(&adev->dev, "No memory for resources\n");
	71	acpi_dev_free_resource_list(&resource_list);
	72	return -ENOMEM;
	73	}
	74	count = 0;
	75	list_for_each_entry(rentry, &resource_list, node)
	76	resources[count++] = rentry->res;
91e56878	77
8e345c99	78	acpi_dev_free_resource_list(&resource_list);
91e56878	79	}
91e56878	80
863f9f30	81	memset(&pdevinfo, 0, sizeof(pdevinfo));
91e56878 MW	82	/*
	83	* If the ACPI node has a parent and that parent has a physical device
	84	* attached to it, that physical device should be the parent of the
	85	* platform device we are about to create.
	86	*/
863f9f30	87	pdevinfo.parent = NULL;
91e56878 MW	88	acpi_parent = adev->parent;
	89	if (acpi_parent) {
	90	struct acpi_device_physical_node *entry;
	91	struct list_head *list;
	92
	93	mutex_lock(&acpi_parent->physical_node_lock);
	94	list = &acpi_parent->physical_node_list;
	95	if (!list_empty(list)) {
	96	entry = list_first_entry(list,
	97	struct acpi_device_physical_node,
	98	node);
863f9f30	99	pdevinfo.parent = entry->dev;
91e56878 MW	100	}
	101	mutex_unlock(&acpi_parent->physical_node_lock);
	102	}
863f9f30 RW	103	pdevinfo.name = dev_name(&adev->dev);
	104	pdevinfo.id = -1;
	105	pdevinfo.res = resources;
	106	pdevinfo.num_res = count;
	107	pdevinfo.acpi_node.handle = adev->handle;
	108	pdev = platform_device_register_full(&pdevinfo);
91e56878 MW	109	if (IS_ERR(pdev)) {
	110	dev_err(&adev->dev, "platform device creation failed: %ld\n",
	111	PTR_ERR(pdev));
	112	pdev = NULL;
	113	} else {
	114	dev_dbg(&adev->dev, "created platform device %s\n",
	115	dev_name(&pdev->dev));
	116	}
	117
8e345c99	118	kfree(resources);
141a297b RW	119	return 1;
	120	}
	121
	122	static struct acpi_scan_handler platform_handler = {
	123	.ids = acpi_platform_device_ids,
	124	.attach = acpi_create_platform_device,
	125	};
	126
	127	void __init acpi_platform_init(void)
	128	{
	129	acpi_scan_add_handler(&platform_handler);
91e56878	130	}