Release 4.14 drivers/acpi/glue.c

/*
 * Link physical devices with ACPI devices support
 *
 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
 * Copyright (c) 2005 Intel Corp.
 *
 * This file is released under the GPLv2.
 */

#include <linux/acpi_iort.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/acpi.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>

#include "internal.h"


#define ACPI_GLUE_DEBUG	0
#if ACPI_GLUE_DEBUG

#define DBG(fmt, ...)						\
	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
#else

#define DBG(fmt, ...)						\
do {                                                            \
        if (0)                                                  \
                printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__);   \
} while (0)
#endif
static LIST_HEAD(bus_type_list);
static DECLARE_RWSEM(bus_type_sem);


#define PHYSICAL_NODE_STRING "physical_node"

#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)



int register_acpi_bus_type(struct acpi_bus_type *type)
{
	if (acpi_disabled)
		return -ENODEV;
	if (type && type->match && type->find_companion) {
		down_write(&bus_type_sem);
		list_add_tail(&type->list, &bus_type_list);
		up_write(&bus_type_sem);
		printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
		return 0;
	}
	return -ENODEV;
}
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67
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2
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3
4.29%
2
50.00%
Total
70
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(register_acpi_bus_type);



int unregister_acpi_bus_type(struct acpi_bus_type *type)
{
	if (acpi_disabled)
		return 0;
	if (type) {
		down_write(&bus_type_sem);
		list_del_init(&type->list);
		up_write(&bus_type_sem);
		printk(KERN_INFO PREFIX "bus type %s unregistered\n",
		       type->name);
		return 0;
	}
	return -ENODEV;
}
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3.45%
1
33.33%
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58
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);



static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
{
	struct acpi_bus_type *tmp, *ret = NULL;

	down_read(&bus_type_sem);
	list_for_each_entry(tmp, &bus_type_list, list) {
		if (tmp->match(dev)) {
			ret = tmp;
			break;
		}
	}
	up_read(&bus_type_sem);
	return ret;
}

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6
9.38%
1
50.00%
Total
64
100.00%
2
100.00%


#define FIND_CHILD_MIN_SCORE	1

#define FIND_CHILD_MAX_SCORE	2



static int find_child_checks(struct acpi_device *adev, bool check_children)
{
	bool sta_present = true;
	unsigned long long sta;
	acpi_status status;

	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
	if (status == AE_NOT_FOUND)
		sta_present = false;
	else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
		return -ENODEV;

	if (check_children && list_empty(&adev->children))
		return -ENODEV;

	/*
         * If the device has a _HID returning a valid ACPI/PNP device ID, it is
         * better to make it look less attractive here, so that the other device
         * with the same _ADR value (that may not have a valid device ID) can be
         * matched going forward.  [This means a second spec violation in a row,
         * so whatever we do here is best effort anyway.]
         */
	return sta_present && !adev->pnp.type.platform_id ?
			FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
}

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75.00%
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7
6.67%
1
12.50%
Jeff Wu
1
0.95%
1
12.50%
Total
105
100.00%
8
100.00%



struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
					   u64 address, bool check_children)
{
	struct acpi_device *adev, *ret = NULL;
	int ret_score = 0;

	if (!parent)
		return NULL;

	list_for_each_entry(adev, &parent->children, node) {
		unsigned long long addr;
		acpi_status status;
		int score;

		status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
					       NULL, &addr);
		if (ACPI_FAILURE(status) || addr != address)
			continue;

		if (!ret) {
			/* This is the first matching object.  Save it. */
			ret = adev;
			continue;
		}
		/*
                 * There is more than one matching device object with the same
                 * _ADR value.  That really is unexpected, so we are kind of
                 * beyond the scope of the spec here.  We have to choose which
                 * one to return, though.
                 *
                 * First, check if the previously found object is good enough
                 * and return it if so.  Second, do the same for the object that
                 * we've just found.
                 */
		if (!ret_score) {
			ret_score = find_child_checks(ret, check_children);
			if (ret_score == FIND_CHILD_MAX_SCORE)
				return ret;
		}
		score = find_child_checks(adev, check_children);
		if (score == FIND_CHILD_MAX_SCORE) {
			return adev;
		} else if (score > ret_score) {
			ret = adev;
			ret_score = score;
		}
	}
	return ret;
}
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71.43%
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18
10.65%
1
14.29%
Jeff Wu
6
3.55%
1
14.29%
Total
169
100.00%
7
100.00%


EXPORT_SYMBOL_GPL(acpi_find_child_device);



static void acpi_physnode_link_name(char *buf, unsigned int node_id)
{
	if (node_id > 0)
		snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
			 PHYSICAL_NODE_STRING "%u", node_id);
	else
		strcpy(buf, PHYSICAL_NODE_STRING);
}

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int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
{
	struct acpi_device_physical_node *physical_node, *pn;
	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
	struct list_head *physnode_list;
	unsigned int node_id;
	int retval = -EINVAL;

	if (has_acpi_companion(dev)) {
		if (acpi_dev) {
			dev_warn(dev, "ACPI companion already set\n");
			return -EINVAL;
		} else {
			acpi_dev = ACPI_COMPANION(dev);
		}
	}
	if (!acpi_dev)
		return -EINVAL;

	get_device(&acpi_dev->dev);
	get_device(dev);
	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
	if (!physical_node) {
		retval = -ENOMEM;
		goto err;
	}

	mutex_lock(&acpi_dev->physical_node_lock);

	/*
         * Keep the list sorted by node_id so that the IDs of removed nodes can
         * be recycled easily.
         */
	physnode_list = &acpi_dev->physical_node_list;
	node_id = 0;
	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
		/* Sanity check. */
		if (pn->dev == dev) {
			mutex_unlock(&acpi_dev->physical_node_lock);

			dev_warn(dev, "Already associated with ACPI node\n");
			kfree(physical_node);
			if (ACPI_COMPANION(dev) != acpi_dev)
				goto err;

			put_device(dev);
			put_device(&acpi_dev->dev);
			return 0;
		}
		if (pn->node_id == node_id) {
			physnode_list = &pn->node;
			node_id++;
		}
	}

	physical_node->node_id = node_id;
	physical_node->dev = dev;
	list_add(&physical_node->node, physnode_list);
	acpi_dev->physical_node_count++;

	if (!has_acpi_companion(dev))
		ACPI_COMPANION_SET(dev, acpi_dev);

	acpi_physnode_link_name(physical_node_name, node_id);
	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
				   physical_node_name);
	if (retval)
		dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
			physical_node_name, retval);

	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
				   "firmware_node");
	if (retval)
		dev_err(dev, "Failed to create link firmware_node (%d)\n",
			retval);

	mutex_unlock(&acpi_dev->physical_node_lock);

	if (acpi_dev->wakeup.flags.valid)
		device_set_wakeup_capable(dev, true);

	return 0;

 err:
	ACPI_COMPANION_SET(dev, NULL);
	put_device(dev);
	put_device(&acpi_dev->dev);
	return retval;
}
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76.47%
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105
25.61%
1
5.88%
David Shaohua Li
37
9.02%
1
5.88%
David Brownell
30
7.32%
1
5.88%
Greg Kroah-Hartman
3
0.73%
1
5.88%
Total
410
100.00%
17
100.00%


EXPORT_SYMBOL_GPL(acpi_bind_one);



int acpi_unbind_one(struct device *dev)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
	struct acpi_device_physical_node *entry;

	if (!acpi_dev)
		return 0;

	mutex_lock(&acpi_dev->physical_node_lock);

	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
		if (entry->dev == dev) {
			char physnode_name[PHYSICAL_NODE_NAME_SIZE];

			list_del(&entry->node);
			acpi_dev->physical_node_count--;

			acpi_physnode_link_name(physnode_name, entry->node_id);
			sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
			sysfs_remove_link(&dev->kobj, "firmware_node");
			ACPI_COMPANION_SET(dev, NULL);
			/* Drop references taken by acpi_bind_one(). */
			put_device(dev);
			put_device(&acpi_dev->dev);
			kfree(entry);
			break;
		}

	mutex_unlock(&acpi_dev->physical_node_lock);
	return 0;
}
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43
29.25%
6
66.67%
David Shaohua Li
30
20.41%
1
11.11%
David Brownell
19
12.93%
1
11.11%
Total
147
100.00%
9
100.00%


EXPORT_SYMBOL_GPL(acpi_unbind_one);



static int acpi_platform_notify(struct device *dev)
{
	struct acpi_bus_type *type = acpi_get_bus_type(dev);
	struct acpi_device *adev;
	int ret;

	ret = acpi_bind_one(dev, NULL);
	if (ret && type) {
		struct acpi_device *adev;

		adev = type->find_companion(dev);
		if (!adev) {
			DBG("Unable to get handle for %s\n", dev_name(dev));
			ret = -ENODEV;
			goto out;
		}
		ret = acpi_bind_one(dev, adev);
		if (ret)
			goto out;
	}
	adev = ACPI_COMPANION(dev);
	if (!adev)
		goto out;

	if (dev->bus == &platform_bus_type)
		acpi_configure_pmsi_domain(dev);

	if (type && type->setup)
		type->setup(dev);
	else if (adev->handler && adev->handler->bind)
		adev->handler->bind(dev);

 out:
#if ACPI_GLUE_DEBUG
	if (!ret) {
		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

		acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
		DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
		kfree(buffer.pointer);
	} else
		DBG("Device %s -> No ACPI support\n", dev_name(dev));
#endif

	return ret;
}

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105
43.21%
2
16.67%
Hanjun Guo
14
5.76%
1
8.33%
Kay Sievers
9
3.70%
1
8.33%
Yinghai Lu
3
1.23%
1
8.33%
Len Brown
1
0.41%
1
8.33%
Total
243
100.00%
12
100.00%



static int acpi_platform_notify_remove(struct device *dev)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);
	struct acpi_bus_type *type;

	if (!adev)
		return 0;

	type = acpi_get_bus_type(dev);
	if (type && type->cleanup)
		type->cleanup(dev);
	else if (adev->handler && adev->handler->unbind)
		adev->handler->unbind(dev);

	acpi_unbind_one(dev);
	return 0;
}

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33.33%
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86
100.00%
3
100.00%



void __init init_acpi_device_notify(void)
{
	if (platform_notify || platform_notify_remove) {
		printk(KERN_ERR PREFIX "Can't use platform_notify\n");
		return;
	}
	platform_notify = acpi_platform_notify;
	platform_notify_remove = acpi_platform_notify_remove;
}
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31
100.00%
2
100.00%

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776
50.36%
29
61.70%
David Shaohua Li
477
30.95%
2
4.26%
Lan Tianyu
164
10.64%
1
2.13%
David Brownell
49
3.18%
1
2.13%
Hanjun Guo
20
1.30%
1
2.13%
Kay Sievers
9
0.58%
1
2.13%
Matthew Garrett
8
0.52%
1
2.13%
Joe Perches
8
0.52%
1
2.13%
Jeff Wu
7
0.45%
1
2.13%
Len Brown
4
0.26%
2
4.26%
Suravee Suthikulpanit
3
0.19%
1
2.13%
Yinghai Lu
3
0.19%
1
2.13%
Greg Kroah-Hartman
3
0.19%
1
2.13%
Tejun Heo
3
0.19%
1
2.13%
Paul Gortmaker
3
0.19%
1
2.13%
Rami Rosen
2
0.13%
1
2.13%
Jeff Garzik
2
0.13%
1
2.13%
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1541
100.00%
47
100.00%
Directory: drivers/acpi

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