[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" },
	{ "VPC2004" },
	{ "BCM4752" },

	/* Intel Smart Sound Technology */
	{ "INT33C8" },
	{ "80860F28" },

	{ }
};

/**
 * 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.companion = adev;
	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" },
b5c37b79	32	{ "VPC2004" },
9208e311	33	{ "BCM4752" },
141a297b	34
e54968ca JN	35	/* Intel Smart Sound Technology */
	36	{ "INT33C8" },
	37	{ "80860F28" },
c0ad8568	38
141a297b RW	39	{ }
	40	};
	41
91e56878 MW	42	/**
	43	* acpi_create_platform_device - Create platform device for ACPI device node
	44	* @adev: ACPI device node to create a platform device for.
141a297b	45	* @id: ACPI device ID used to match @adev.
91e56878 MW	46	*
	47	* Check if the given @adev can be represented as a platform device and, if
	48	* that's the case, create and register a platform device, populate its common
	49	* resources and returns a pointer to it. Otherwise, return %NULL.
	50	*
7eaa2800	51	* Name of the platform device will be the same as @adev's.
91e56878	52	*/
f58b082a RW	53	int acpi_create_platform_device(struct acpi_device *adev,
f58b082a RW	54	const struct acpi_device_id *id)
91e56878 MW	55	{
	56	struct platform_device *pdev = NULL;
	57	struct acpi_device *acpi_parent;
863f9f30	58	struct platform_device_info pdevinfo;
8e345c99 RW	59	struct resource_list_entry *rentry;
8e345c99 RW	60	struct list_head resource_list;
62eb4b07	61	struct resource *resources = NULL;
8e345c99	62	int count;
91e56878 MW	63
	64	/* If the ACPI node already has a physical device attached, skip it. */
	65	if (adev->physical_node_count)
141a297b	66	return 0;
91e56878	67
8e345c99 RW	68	INIT_LIST_HEAD(&resource_list);
8e345c99 RW	69	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
d2fe7251	70	if (count < 0) {
141a297b	71	return 0;
d2fe7251 RW	72	} else if (count > 0) {
	73	resources = kmalloc(count * sizeof(struct resource),
	74	GFP_KERNEL);
	75	if (!resources) {
	76	dev_err(&adev->dev, "No memory for resources\n");
	77	acpi_dev_free_resource_list(&resource_list);
	78	return -ENOMEM;
	79	}
	80	count = 0;
	81	list_for_each_entry(rentry, &resource_list, node)
	82	resources[count++] = rentry->res;
91e56878	83
8e345c99	84	acpi_dev_free_resource_list(&resource_list);
91e56878	85	}
91e56878	86
863f9f30	87	memset(&pdevinfo, 0, sizeof(pdevinfo));
91e56878 MW	88	/*
	89	* If the ACPI node has a parent and that parent has a physical device
	90	* attached to it, that physical device should be the parent of the
	91	* platform device we are about to create.
	92	*/
863f9f30	93	pdevinfo.parent = NULL;
91e56878 MW	94	acpi_parent = adev->parent;
	95	if (acpi_parent) {
	96	struct acpi_device_physical_node *entry;
	97	struct list_head *list;
	98
	99	mutex_lock(&acpi_parent->physical_node_lock);
	100	list = &acpi_parent->physical_node_list;
	101	if (!list_empty(list)) {
	102	entry = list_first_entry(list,
	103	struct acpi_device_physical_node,
	104	node);
863f9f30	105	pdevinfo.parent = entry->dev;
91e56878 MW	106	}
	107	mutex_unlock(&acpi_parent->physical_node_lock);
	108	}
863f9f30 RW	109	pdevinfo.name = dev_name(&adev->dev);
	110	pdevinfo.id = -1;
	111	pdevinfo.res = resources;
	112	pdevinfo.num_res = count;
7b199811	113	pdevinfo.acpi_node.companion = adev;
863f9f30	114	pdev = platform_device_register_full(&pdevinfo);
91e56878 MW	115	if (IS_ERR(pdev)) {
	116	dev_err(&adev->dev, "platform device creation failed: %ld\n",
	117	PTR_ERR(pdev));
	118	pdev = NULL;
	119	} else {
	120	dev_dbg(&adev->dev, "created platform device %s\n",
	121	dev_name(&pdev->dev));
	122	}
	123
8e345c99	124	kfree(resources);
141a297b RW	125	return 1;
	126	}
	127
	128	static struct acpi_scan_handler platform_handler = {
	129	.ids = acpi_platform_device_ids,
	130	.attach = acpi_create_platform_device,
	131	};
	132
	133	void __init acpi_platform_init(void)
	134	{
	135	acpi_scan_add_handler(&platform_handler);
91e56878	136	}