[linux-2.6-block.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/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 platform_device_info pdevinfo;
	struct resource_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 = kzalloc(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 = adev->parent ?
		acpi_get_first_physical_node(adev->parent) : NULL;
	pdevinfo.name = dev_name(&adev->dev);
	pdevinfo.id = -1;
	pdevinfo.res = resources;
	pdevinfo.num_res = count;
	pdevinfo.fwnode = acpi_fwnode_handle(adev);

	if (acpi_dma_supported(adev))
		pdevinfo.dma_mask = DMA_BIT_MASK(32);
	else
		pdevinfo.dma_mask = 0;

	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);
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>
91e56878 MW	18	#include <linux/module.h>
8a2f38dd	19	#include <linux/dma-mapping.h>
91e56878 MW	20	#include <linux/platform_device.h>
91e56878 MW	21
5923f986 AS	22	#include "internal.h"
5923f986 AS	23
91e56878 MW	24	ACPI_MODULE_NAME("platform");
91e56878 MW	25
48459340 ZR	26	static const struct acpi_device_id forbidden_id_list[] = {
	27	{"PNP0000", 0}, /* PIC */
	28	{"PNP0100", 0}, /* Timer */
	29	{"PNP0200", 0}, /* AT DMA Controller */
	30	{"", 0},
141a297b RW	31	};
141a297b RW	32
91e56878 MW	33	/**
	34	* acpi_create_platform_device - Create platform device for ACPI device node
	35	* @adev: ACPI device node to create a platform device for.
	36	*
	37	* Check if the given @adev can be represented as a platform device and, if
	38	* that's the case, create and register a platform device, populate its common
	39	* resources and returns a pointer to it. Otherwise, return %NULL.
	40	*
7eaa2800	41	* Name of the platform device will be the same as @adev's.
91e56878	42	*/
8ce62f85	43	struct platform_device acpi_create_platform_device(struct acpi_device adev)
91e56878 MW	44	{
91e56878 MW	45	struct platform_device *pdev = NULL;
863f9f30	46	struct platform_device_info pdevinfo;
90e97820	47	struct resource_entry *rentry;
8e345c99	48	struct list_head resource_list;
62eb4b07	49	struct resource *resources = NULL;
8e345c99	50	int count;
91e56878 MW	51
	52	/* If the ACPI node already has a physical device attached, skip it. */
	53	if (adev->physical_node_count)
8ce62f85	54	return NULL;
91e56878	55
48459340 ZR	56	if (!acpi_match_device_ids(adev, forbidden_id_list))
	57	return ERR_PTR(-EINVAL);
	58
8e345c99 RW	59	INIT_LIST_HEAD(&resource_list);
8e345c99 RW	60	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
d2fe7251	61	if (count < 0) {
8ce62f85	62	return NULL;
d2fe7251	63	} else if (count > 0) {
9a975bee	64	resources = kzalloc(count * sizeof(struct resource),
d2fe7251 RW	65	GFP_KERNEL);
	66	if (!resources) {
	67	dev_err(&adev->dev, "No memory for resources\n");
	68	acpi_dev_free_resource_list(&resource_list);
8ce62f85	69	return ERR_PTR(-ENOMEM);
d2fe7251 RW	70	}
	71	count = 0;
	72	list_for_each_entry(rentry, &resource_list, node)
90e97820	73	resources[count++] = *rentry->res;
91e56878	74
8e345c99	75	acpi_dev_free_resource_list(&resource_list);
91e56878	76	}
91e56878	77
863f9f30	78	memset(&pdevinfo, 0, sizeof(pdevinfo));
91e56878 MW	79	/*
	80	* If the ACPI node has a parent and that parent has a physical device
	81	* attached to it, that physical device should be the parent of the
	82	* platform device we are about to create.
	83	*/
3b95bd16 AM	84	pdevinfo.parent = adev->parent ?
3b95bd16 AM	85	acpi_get_first_physical_node(adev->parent) : NULL;
863f9f30 RW	86	pdevinfo.name = dev_name(&adev->dev);
	87	pdevinfo.id = -1;
	88	pdevinfo.res = resources;
	89	pdevinfo.num_res = count;
ce793486	90	pdevinfo.fwnode = acpi_fwnode_handle(adev);
1831eff8 SS	91
	92	if (acpi_dma_supported(adev))
	93	pdevinfo.dma_mask = DMA_BIT_MASK(32);
	94	else
	95	pdevinfo.dma_mask = 0;
	96
863f9f30	97	pdev = platform_device_register_full(&pdevinfo);
8ce62f85	98	if (IS_ERR(pdev))
91e56878 MW	99	dev_err(&adev->dev, "platform device creation failed: %ld\n",
91e56878 MW	100	PTR_ERR(pdev));
8ce62f85	101	else
91e56878 MW	102	dev_dbg(&adev->dev, "created platform device %s\n",
91e56878 MW	103	dev_name(&pdev->dev));
91e56878	104
8e345c99	105	kfree(resources);
8ce62f85 RW	106	return pdev;
8ce62f85 RW	107	}
083bf668	108	EXPORT_SYMBOL_GPL(acpi_create_platform_device);