drivers/acpi/acpi_platform.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>

 ACPI_MODULE_NAME("platform");

 struct resource_info {
 	struct device *dev;
 	struct resource *res;
 	size_t n, cur;
 };

 static acpi_status acpi_platform_count_resources(struct acpi_resource *res,
 						 void *data)
 {
 	struct acpi_resource_extended_irq *acpi_xirq;
 	struct resource_info *ri = data;

 	switch (res->type) {
 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 	case ACPI_RESOURCE_TYPE_IRQ:
 		ri->n++;
 		break;
 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 		acpi_xirq = &res->data.extended_irq;
 		ri->n += acpi_xirq->interrupt_count;
 		break;
 	case ACPI_RESOURCE_TYPE_ADDRESS32:
 		if (res->data.address32.resource_type == ACPI_IO_RANGE)
 			ri->n++;
 		break;
 	}

 	return AE_OK;
 }

 static acpi_status acpi_platform_add_resources(struct acpi_resource *res,
 					       void *data)
 {
 	struct acpi_resource_fixed_memory32 *acpi_mem;
 	struct acpi_resource_address32 *acpi_add32;
 	struct acpi_resource_extended_irq *acpi_xirq;
 	struct acpi_resource_irq *acpi_irq;
 	struct resource_info *ri = data;
 	struct resource *r;
 	int irq, i;

 	switch (res->type) {
 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 		acpi_mem = &res->data.fixed_memory32;
 		r = &ri->res[ri->cur++];

 		r->start = acpi_mem->address;
 		r->end = r->start + acpi_mem->address_length - 1;
 		r->flags = IORESOURCE_MEM;

 		dev_dbg(ri->dev, "Memory32Fixed %pR\n", r);
 		break;

 	case ACPI_RESOURCE_TYPE_ADDRESS32:
 		acpi_add32 = &res->data.address32;

 		if (acpi_add32->resource_type == ACPI_IO_RANGE) {
 			r = &ri->res[ri->cur++];
 			r->start = acpi_add32->minimum;
 			r->end = r->start + acpi_add32->address_length - 1;
 			r->flags = IORESOURCE_IO;
 			dev_dbg(ri->dev, "Address32 %pR\n", r);
 		}
 		break;

 	case ACPI_RESOURCE_TYPE_IRQ:
 		acpi_irq = &res->data.irq;
 		r = &ri->res[ri->cur++];

 		irq = acpi_register_gsi(ri->dev,
 					acpi_irq->interrupts[0],
 					acpi_irq->triggering,
 					acpi_irq->polarity);

 		r->start = r->end = irq;
 		r->flags = IORESOURCE_IRQ;

 		dev_dbg(ri->dev, "IRQ %pR\n", r);
 		break;

 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 		acpi_xirq = &res->data.extended_irq;

 		for (i = 0; i < acpi_xirq->interrupt_count; i++, ri->cur++) {
 			r = &ri->res[ri->cur];
 			irq = acpi_register_gsi(ri->dev,
 						acpi_xirq->interrupts[i],
 						acpi_xirq->triggering,
 						acpi_xirq->polarity);

 			r->start = r->end = irq;
 			r->flags = IORESOURCE_IRQ;

 			dev_dbg(ri->dev, "Interrupt %pR\n", r);
 		}
 		break;
 	}

 	return AE_OK;
 }

 /**
  * 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.
  *
  * The platform device's name will be taken from the @adev's _HID and _UID.
  */
 struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
 {
 	struct platform_device *pdev = NULL;
 	struct acpi_device *acpi_parent;
 	struct device *parent = NULL;
 	struct resource_info ri;
 	acpi_status status;

 	/* If the ACPI node already has a physical device attached, skip it. */
 	if (adev->physical_node_count)
 		return NULL;

 	memset(&ri, 0, sizeof(ri));
 	/* First, count the resources. */
 	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
 				     acpi_platform_count_resources, &ri);
 	if (ACPI_FAILURE(status) || !ri.n)
 		return NULL;

 	/* Next, allocate memory for all the resources and populate it. */
 	ri.dev = &adev->dev;
 	ri.res = kzalloc(ri.n * sizeof(struct resource), GFP_KERNEL);
 	if (!ri.res) {
 		dev_err(&adev->dev,
 			"failed to allocate memory for resources\n");
 		return NULL;
 	}

 	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
 				     acpi_platform_add_resources, &ri);
 	if (ACPI_FAILURE(status)) {
 		dev_err(&adev->dev, "failed to walk resources\n");
 		goto out;
 	}

 	if (WARN_ON(ri.n != ri.cur))
 		goto out;

 	/*
 	 * 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.
 	 */
 	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);
 			parent = entry->dev;
 		}
 		mutex_unlock(&acpi_parent->physical_node_lock);
 	}
 	pdev = platform_device_register_resndata(parent, dev_name(&adev->dev),
 						 -1, ri.res, ri.n, NULL, 0);
 	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));
 	}

  out:
 	kfree(ri.res);
 	return pdev;
 }

 static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
 				       void *data, void **return_value)
 {
 	struct platform_device *pdev = data;
 	struct acpi_device *adev;
 	acpi_status status;

 	status = acpi_bus_get_device(handle, &adev);
 	if (ACPI_FAILURE(status))
 		return status;

 	/* Skip ACPI devices that have physical device attached */
 	if (adev->physical_node_count)
 		return AE_OK;

 	if (!strcmp(dev_name(&pdev->dev), dev_name(&adev->dev))) {
 		*(acpi_handle *)return_value = handle;
 		return AE_CTRL_TERMINATE;
 	}

 	return AE_OK;
 }

 static int acpi_platform_find_device(struct device *dev, acpi_handle *handle)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	char *name, *tmp, *hid;

 	/*
 	 * The platform device is named using the ACPI device name
 	 * _HID:INSTANCE so we strip the INSTANCE out in order to find the
 	 * correct device using its _HID.
 	 */
 	name = kstrdup(dev_name(dev), GFP_KERNEL);
 	if (!name)
 		return -ENOMEM;

 	tmp = name;
 	hid = strsep(&tmp, ":");
 	if (!hid) {
 		kfree(name);
 		return -ENODEV;
 	}

 	*handle = NULL;
 	acpi_get_devices(hid, acpi_platform_match, pdev, handle);

 	kfree(name);
 	return *handle ? 0 : -ENODEV;
 }

 static struct acpi_bus_type acpi_platform_bus = {
 	.bus = &platform_bus_type,
 	.find_device = acpi_platform_find_device,
 };

 static int __init acpi_platform_init(void)
 {
 	return register_acpi_bus_type(&acpi_platform_bus);
 }
 arch_initcall(acpi_platform_init);
	/*
	* 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/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>

	ACPI_MODULE_NAME("platform");

	struct resource_info {
	struct device *dev;
	struct resource *res;
	size_t n, cur;
	};

	static acpi_status acpi_platform_count_resources(struct acpi_resource *res,
	void *data)
	{
	struct acpi_resource_extended_irq *acpi_xirq;
	struct resource_info *ri = data;

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
	case ACPI_RESOURCE_TYPE_IRQ:
	ri->n++;
	break;
	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
	acpi_xirq = &res->data.extended_irq;
	ri->n += acpi_xirq->interrupt_count;
	break;
	case ACPI_RESOURCE_TYPE_ADDRESS32:
	if (res->data.address32.resource_type == ACPI_IO_RANGE)
	ri->n++;
	break;
	}

	return AE_OK;
	}

	static acpi_status acpi_platform_add_resources(struct acpi_resource *res,
	void *data)
	{
	struct acpi_resource_fixed_memory32 *acpi_mem;
	struct acpi_resource_address32 *acpi_add32;
	struct acpi_resource_extended_irq *acpi_xirq;
	struct acpi_resource_irq *acpi_irq;
	struct resource_info *ri = data;
	struct resource *r;
	int irq, i;

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
	acpi_mem = &res->data.fixed_memory32;
	r = &ri->res[ri->cur++];

	r->start = acpi_mem->address;
	r->end = r->start + acpi_mem->address_length - 1;
	r->flags = IORESOURCE_MEM;

	dev_dbg(ri->dev, "Memory32Fixed %pR\n", r);
	break;

	case ACPI_RESOURCE_TYPE_ADDRESS32:
	acpi_add32 = &res->data.address32;

	if (acpi_add32->resource_type == ACPI_IO_RANGE) {
	r = &ri->res[ri->cur++];
	r->start = acpi_add32->minimum;
	r->end = r->start + acpi_add32->address_length - 1;
	r->flags = IORESOURCE_IO;
	dev_dbg(ri->dev, "Address32 %pR\n", r);
	}
	break;

	case ACPI_RESOURCE_TYPE_IRQ:
	acpi_irq = &res->data.irq;
	r = &ri->res[ri->cur++];

	irq = acpi_register_gsi(ri->dev,
	acpi_irq->interrupts[0],
	acpi_irq->triggering,
	acpi_irq->polarity);

	r->start = r->end = irq;
	r->flags = IORESOURCE_IRQ;

	dev_dbg(ri->dev, "IRQ %pR\n", r);
	break;

	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
	acpi_xirq = &res->data.extended_irq;

	for (i = 0; i < acpi_xirq->interrupt_count; i++, ri->cur++) {
	r = &ri->res[ri->cur];
	irq = acpi_register_gsi(ri->dev,
	acpi_xirq->interrupts[i],
	acpi_xirq->triggering,
	acpi_xirq->polarity);

	r->start = r->end = irq;
	r->flags = IORESOURCE_IRQ;

	dev_dbg(ri->dev, "Interrupt %pR\n", r);
	}
	break;
	}

	return AE_OK;
	}

	/**
	* 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.
	*
	* The platform device's name will be taken from the @adev's _HID and _UID.
	*/
	struct platform_device acpi_create_platform_device(struct acpi_device adev)
	{
	struct platform_device *pdev = NULL;
	struct acpi_device *acpi_parent;
	struct device *parent = NULL;
	struct resource_info ri;
	acpi_status status;

	/* If the ACPI node already has a physical device attached, skip it. */
	if (adev->physical_node_count)
	return NULL;

	memset(&ri, 0, sizeof(ri));
	/* First, count the resources. */
	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
	acpi_platform_count_resources, &ri);
	if (ACPI_FAILURE(status) \|\| !ri.n)
	return NULL;

	/* Next, allocate memory for all the resources and populate it. */
	ri.dev = &adev->dev;
	ri.res = kzalloc(ri.n * sizeof(struct resource), GFP_KERNEL);
	if (!ri.res) {
	dev_err(&adev->dev,
	"failed to allocate memory for resources\n");
	return NULL;
	}

	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
	acpi_platform_add_resources, &ri);
	if (ACPI_FAILURE(status)) {
	dev_err(&adev->dev, "failed to walk resources\n");
	goto out;
	}

	if (WARN_ON(ri.n != ri.cur))
	goto out;

	/*
	* 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.
	*/
	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);
	parent = entry->dev;
	}
	mutex_unlock(&acpi_parent->physical_node_lock);
	}
	pdev = platform_device_register_resndata(parent, dev_name(&adev->dev),
	-1, ri.res, ri.n, NULL, 0);
	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));
	}

	out:
	kfree(ri.res);
	return pdev;
	}

	static acpi_status acpi_platform_match(acpi_handle handle, u32 depth,
	void data, void *return_value)
	{
	struct platform_device *pdev = data;
	struct acpi_device *adev;
	acpi_status status;

	status = acpi_bus_get_device(handle, &adev);
	if (ACPI_FAILURE(status))
	return status;

	/* Skip ACPI devices that have physical device attached */
	if (adev->physical_node_count)
	return AE_OK;

	if (!strcmp(dev_name(&pdev->dev), dev_name(&adev->dev))) {
	(acpi_handle )return_value = handle;
	return AE_CTRL_TERMINATE;
	}

	return AE_OK;
	}

	static int acpi_platform_find_device(struct device dev, acpi_handle handle)
	{
	struct platform_device *pdev = to_platform_device(dev);
	char name, tmp, *hid;

	/*
	* The platform device is named using the ACPI device name
	* _HID:INSTANCE so we strip the INSTANCE out in order to find the
	* correct device using its _HID.
	*/
	name = kstrdup(dev_name(dev), GFP_KERNEL);
	if (!name)
	return -ENOMEM;

	tmp = name;
	hid = strsep(&tmp, ":");
	if (!hid) {
	kfree(name);
	return -ENODEV;
	}

	*handle = NULL;
	acpi_get_devices(hid, acpi_platform_match, pdev, handle);

	kfree(name);
	return *handle ? 0 : -ENODEV;
	}

	static struct acpi_bus_type acpi_platform_bus = {
	.bus = &platform_bus_type,
	.find_device = acpi_platform_find_device,
	};

	static int __init acpi_platform_init(void)
	{
	return register_acpi_bus_type(&acpi_platform_bus);
	}
	arch_initcall(acpi_platform_init);