scan.c 56.3 KB
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/*
 * scan.c - support for transforming the ACPI namespace into individual objects
 */

#include <linux/module.h>
#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/signal.h>
#include <linux/kthread.h>
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#include <linux/dmi.h>
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#include <linux/nls.h>
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#include <asm/pgtable.h>

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#include "internal.h"

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#define _COMPONENT		ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("scan");
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extern struct acpi_device *acpi_root;
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#define ACPI_BUS_CLASS			"system_bus"
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#define ACPI_BUS_HID			"LNXSYBUS"
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#define ACPI_BUS_DEVICE_NAME		"System Bus"

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#define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)

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#define INVALID_ACPI_HANDLE	((acpi_handle)empty_zero_page)

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/*
 * If set, devices will be hot-removed even if they cannot be put offline
 * gracefully (from the kernel's standpoint).
 */
bool acpi_force_hot_remove;

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static const char *dummy_hid = "device";
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static LIST_HEAD(acpi_bus_id_list);
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static DEFINE_MUTEX(acpi_scan_lock);
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static LIST_HEAD(acpi_scan_handlers_list);
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DEFINE_MUTEX(acpi_device_lock);
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LIST_HEAD(acpi_wakeup_device_list);
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static DEFINE_MUTEX(acpi_hp_context_lock);
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struct acpi_device_bus_id{
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	char bus_id[15];
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	unsigned int instance_no;
	struct list_head node;
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};
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void acpi_scan_lock_acquire(void)
{
	mutex_lock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);

void acpi_scan_lock_release(void)
{
	mutex_unlock(&acpi_scan_lock);
}
EXPORT_SYMBOL_GPL(acpi_scan_lock_release);

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void acpi_lock_hp_context(void)
{
	mutex_lock(&acpi_hp_context_lock);
}

void acpi_unlock_hp_context(void)
{
	mutex_unlock(&acpi_hp_context_lock);
}

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int acpi_scan_add_handler(struct acpi_scan_handler *handler)
{
	if (!handler || !handler->attach)
		return -EINVAL;

	list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
	return 0;
}

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int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
				       const char *hotplug_profile_name)
{
	int error;

	error = acpi_scan_add_handler(handler);
	if (error)
		return error;

	acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
	return 0;
}

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/*
 * Creates hid/cid(s) string needed for modalias and uevent
 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
 * char *modalias: "acpi:IBM0001:ACPI0001"
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 * Return: 0: no _HID and no _CID
 *         -EINVAL: output error
 *         -ENOMEM: output is truncated
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*/
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static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
			   int size)
{
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	int len;
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	int count;
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	struct acpi_hardware_id *id;
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	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

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	len = snprintf(modalias, size, "acpi:");
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	size -= len;

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	list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
		count = snprintf(&modalias[len], size, "%s:", id->id);
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		if (count < 0)
			return EINVAL;
		if (count >= size)
			return -ENOMEM;
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		len += count;
		size -= count;
	}

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	modalias[len] = '\0';
	return len;
}

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/*
 * Creates uevent modalias field for ACPI enumerated devices.
 * Because the other buses does not support ACPI HIDs & CIDs.
 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 * "acpi:IBM0001:ACPI0001"
 */
int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
{
	struct acpi_device *acpi_dev;
	int len;

	acpi_dev = ACPI_COMPANION(dev);
	if (!acpi_dev)
		return -ENODEV;

	/* Fall back to bus specific way of modalias exporting */
	if (list_empty(&acpi_dev->pnp.ids))
		return -ENODEV;

	if (add_uevent_var(env, "MODALIAS="))
		return -ENOMEM;
	len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
				sizeof(env->buf) - env->buflen);
	if (len <= 0)
		return len;
	env->buflen += len;
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);

/*
 * Creates modalias sysfs attribute for ACPI enumerated devices.
 * Because the other buses does not support ACPI HIDs & CIDs.
 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
 * "acpi:IBM0001:ACPI0001"
 */
int acpi_device_modalias(struct device *dev, char *buf, int size)
{
	struct acpi_device *acpi_dev;
	int len;

	acpi_dev = ACPI_COMPANION(dev);
	if (!acpi_dev)
		return -ENODEV;

	/* Fall back to bus specific way of modalias exporting */
	if (list_empty(&acpi_dev->pnp.ids))
		return -ENODEV;

	len = create_modalias(acpi_dev, buf, size -1);
	if (len <= 0)
		return len;
	buf[len++] = '\n';
	return len;
}
EXPORT_SYMBOL_GPL(acpi_device_modalias);

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static ssize_t
acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	int len;

	len = create_modalias(acpi_dev, buf, 1024);
	if (len <= 0)
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		return len;
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	buf[len++] = '\n';
	return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);

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bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
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{
	struct acpi_device_physical_node *pn;
	bool offline = true;

	mutex_lock(&adev->physical_node_lock);

	list_for_each_entry(pn, &adev->physical_node_list, node)
		if (device_supports_offline(pn->dev) && !pn->dev->offline) {
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			if (uevent)
				kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);

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			offline = false;
			break;
		}

	mutex_unlock(&adev->physical_node_lock);
	return offline;
}

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static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
				    void **ret_p)
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{
	struct acpi_device *device = NULL;
	struct acpi_device_physical_node *pn;
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	bool second_pass = (bool)data;
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	acpi_status status = AE_OK;

	if (acpi_bus_get_device(handle, &device))
		return AE_OK;

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	if (device->handler && !device->handler->hotplug.enabled) {
		*ret_p = &device->dev;
		return AE_SUPPORT;
	}

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	mutex_lock(&device->physical_node_lock);

	list_for_each_entry(pn, &device->physical_node_list, node) {
		int ret;

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		if (second_pass) {
			/* Skip devices offlined by the first pass. */
			if (pn->put_online)
				continue;
		} else {
			pn->put_online = false;
		}
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		ret = device_offline(pn->dev);
		if (acpi_force_hot_remove)
			continue;

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		if (ret >= 0) {
			pn->put_online = !ret;
		} else {
			*ret_p = pn->dev;
			if (second_pass) {
				status = AE_ERROR;
				break;
			}
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		}
	}

	mutex_unlock(&device->physical_node_lock);

	return status;
}

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static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
				   void **ret_p)
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{
	struct acpi_device *device = NULL;
	struct acpi_device_physical_node *pn;

	if (acpi_bus_get_device(handle, &device))
		return AE_OK;

	mutex_lock(&device->physical_node_lock);

	list_for_each_entry(pn, &device->physical_node_list, node)
		if (pn->put_online) {
			device_online(pn->dev);
			pn->put_online = false;
		}

	mutex_unlock(&device->physical_node_lock);

	return AE_OK;
}

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static int acpi_scan_try_to_offline(struct acpi_device *device)
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{
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	acpi_handle handle = device->handle;
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	struct device *errdev = NULL;
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	acpi_status status;
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	/*
	 * Carry out two passes here and ignore errors in the first pass,
	 * because if the devices in question are memory blocks and
	 * CONFIG_MEMCG is set, one of the blocks may hold data structures
	 * that the other blocks depend on, but it is not known in advance which
	 * block holds them.
	 *
	 * If the first pass is successful, the second one isn't needed, though.
	 */
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	status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				     NULL, acpi_bus_offline, (void *)false,
				     (void **)&errdev);
	if (status == AE_SUPPORT) {
		dev_warn(errdev, "Offline disabled.\n");
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_online, NULL, NULL, NULL);
		return -EPERM;
	}
	acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
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	if (errdev) {
		errdev = NULL;
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		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
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				    NULL, acpi_bus_offline, (void *)true,
				    (void **)&errdev);
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		if (!errdev || acpi_force_hot_remove)
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			acpi_bus_offline(handle, 0, (void *)true,
					 (void **)&errdev);
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		if (errdev && !acpi_force_hot_remove) {
			dev_warn(errdev, "Offline failed.\n");
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			acpi_bus_online(handle, 0, NULL, NULL);
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			acpi_walk_namespace(ACPI_TYPE_ANY, handle,
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					    ACPI_UINT32_MAX, acpi_bus_online,
					    NULL, NULL, NULL);
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			return -EBUSY;
		}
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	}
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	return 0;
}

static int acpi_scan_hot_remove(struct acpi_device *device)
{
	acpi_handle handle = device->handle;
	unsigned long long sta;
	acpi_status status;

	if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
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		if (!acpi_scan_is_offline(device, true))
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			return -EBUSY;
	} else {
		int error = acpi_scan_try_to_offline(device);
		if (error)
			return error;
	}
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	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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		"Hot-removing device %s...\n", dev_name(&device->dev)));
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	acpi_bus_trim(device);
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	acpi_evaluate_lck(handle, 0);
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	/*
	 * TBD: _EJD support.
	 */
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	status = acpi_evaluate_ej0(handle);
	if (status == AE_NOT_FOUND)
		return -ENODEV;
	else if (ACPI_FAILURE(status))
		return -EIO;
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	/*
	 * Verify if eject was indeed successful.  If not, log an error
	 * message.  No need to call _OST since _EJ0 call was made OK.
	 */
	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	if (ACPI_FAILURE(status)) {
		acpi_handle_warn(handle,
			"Status check after eject failed (0x%x)\n", status);
	} else if (sta & ACPI_STA_DEVICE_ENABLED) {
		acpi_handle_warn(handle,
			"Eject incomplete - status 0x%llx\n", sta);
	}

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	return 0;
}
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static int acpi_scan_device_not_present(struct acpi_device *adev)
{
	if (!acpi_device_enumerated(adev)) {
		dev_warn(&adev->dev, "Still not present\n");
		return -EALREADY;
	}
	acpi_bus_trim(adev);
	return 0;
}

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static int acpi_scan_device_check(struct acpi_device *adev)
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{
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	int error;
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	acpi_bus_get_status(adev);
	if (adev->status.present || adev->status.functional) {
		/*
		 * This function is only called for device objects for which
		 * matching scan handlers exist.  The only situation in which
		 * the scan handler is not attached to this device object yet
		 * is when the device has just appeared (either it wasn't
		 * present at all before or it was removed and then added
		 * again).
		 */
		if (adev->handler) {
			dev_warn(&adev->dev, "Already enumerated\n");
			return -EALREADY;
		}
		error = acpi_bus_scan(adev->handle);
		if (error) {
			dev_warn(&adev->dev, "Namespace scan failure\n");
			return error;
		}
		if (!adev->handler) {
			dev_warn(&adev->dev, "Enumeration failure\n");
			error = -ENODEV;
		}
	} else {
		error = acpi_scan_device_not_present(adev);
	}
	return error;
}

static int acpi_scan_bus_check(struct acpi_device *adev)
{
	struct acpi_scan_handler *handler = adev->handler;
	struct acpi_device *child;
	int error;

	acpi_bus_get_status(adev);
	if (!(adev->status.present || adev->status.functional)) {
		acpi_scan_device_not_present(adev);
		return 0;
	}
	if (handler && handler->hotplug.scan_dependent)
		return handler->hotplug.scan_dependent(adev);

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	error = acpi_bus_scan(adev->handle);
	if (error) {
		dev_warn(&adev->dev, "Namespace scan failure\n");
		return error;
	}
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	list_for_each_entry(child, &adev->children, node) {
		error = acpi_scan_bus_check(child);
		if (error)
			return error;
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	}
	return 0;
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}

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static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
{
	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		return acpi_scan_bus_check(adev);
	case ACPI_NOTIFY_DEVICE_CHECK:
		return acpi_scan_device_check(adev);
	case ACPI_NOTIFY_EJECT_REQUEST:
	case ACPI_OST_EC_OSPM_EJECT:
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		if (adev->handler && !adev->handler->hotplug.enabled) {
			dev_info(&adev->dev, "Eject disabled\n");
			return -EPERM;
		}
		acpi_evaluate_hotplug_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
					  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
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		return acpi_scan_hot_remove(adev);
	}
	return -EINVAL;
}

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void acpi_device_hotplug(void *data, u32 src)
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{
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
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	struct acpi_device *adev = data;
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	int error = -ENODEV;
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	lock_device_hotplug();
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	mutex_lock(&acpi_scan_lock);
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	/*
	 * The device object's ACPI handle cannot become invalid as long as we
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	 * are holding acpi_scan_lock, but it might have become invalid before
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	 * that lock was acquired.
	 */
	if (adev->handle == INVALID_ACPI_HANDLE)
		goto err_out;

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	if (adev->flags.hotplug_notify) {
		error = acpi_generic_hotplug_event(adev, src);
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		if (error == -EPERM) {
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			ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
			goto err_out;
		}
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	} else {
		int (*event)(struct acpi_device *, u32);
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		acpi_lock_hp_context();
		event = adev->hp ? adev->hp->event : NULL;
		acpi_unlock_hp_context();
		/*
		 * There may be additional notify handlers for device objects
		 * without the .event() callback, so ignore them here.
		 */
		if (event)
			error = event(adev, src);
		else
			goto out;
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	}
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	if (!error)
		ost_code = ACPI_OST_SC_SUCCESS;

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 err_out:
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	acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL);
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 out:
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	acpi_bus_put_acpi_device(adev);
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	mutex_unlock(&acpi_scan_lock);
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	unlock_device_hotplug();
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}

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static ssize_t real_power_state_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct acpi_device *adev = to_acpi_device(dev);
	int state;
	int ret;

	ret = acpi_device_get_power(adev, &state);
	if (ret)
		return ret;

	return sprintf(buf, "%s\n", acpi_power_state_string(state));
}

static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);

static ssize_t power_state_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct acpi_device *adev = to_acpi_device(dev);

	return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
}

static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);

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static ssize_t
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acpi_eject_store(struct device *d, struct device_attribute *attr,
		const char *buf, size_t count)
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{
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	struct acpi_device *acpi_device = to_acpi_device(d);
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	acpi_object_type not_used;
	acpi_status status;
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	if (!count || buf[0] != '1')
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		return -EINVAL;

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	if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
	    && !acpi_device->driver)
		return -ENODEV;

	status = acpi_get_type(acpi_device->handle, &not_used);
	if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
		return -ENODEV;

	get_device(&acpi_device->dev);
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	status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device,
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				      ACPI_OST_EC_OSPM_EJECT);
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	if (ACPI_SUCCESS(status))
		return count;
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	put_device(&acpi_device->dev);
	acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
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				  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
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	return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
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}

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static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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static ssize_t
acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
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	return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
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}
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static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
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static ssize_t acpi_device_uid_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
}
static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);

static ssize_t acpi_device_adr_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "0x%08x\n",
		       (unsigned int)(acpi_dev->pnp.bus_address));
}
static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);

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static ssize_t
acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
	int result;
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	result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
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	if (result)
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		goto end;
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	result = sprintf(buf, "%s\n", (char*)path.pointer);
	kfree(path.pointer);
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end:
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	return result;
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}
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static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
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/* sysfs file that shows description text from the ACPI _STR method */
static ssize_t description_show(struct device *dev,
				struct device_attribute *attr,
				char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	int result;

	if (acpi_dev->pnp.str_obj == NULL)
		return 0;

	/*
	 * The _STR object contains a Unicode identifier for a device.
	 * We need to convert to utf-8 so it can be displayed.
	 */
	result = utf16s_to_utf8s(
		(wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
		acpi_dev->pnp.str_obj->buffer.length,
		UTF16_LITTLE_ENDIAN, buf,
		PAGE_SIZE);

	buf[result++] = '\n';

	return result;
}
static DEVICE_ATTR(description, 0444, description_show, NULL);

Y
Yasuaki Ishimatsu 已提交
652 653 654 655 656 657 658 659 660
static ssize_t
acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
		     char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
}
static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);

661 662 663 664 665 666 667 668 669 670 671 672 673 674
static ssize_t status_show(struct device *dev, struct device_attribute *attr,
				char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	acpi_status status;
	unsigned long long sta;

	status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return sprintf(buf, "%llu\n", sta);
}
static DEVICE_ATTR_RO(status);

675
static int acpi_device_setup_files(struct acpi_device *dev)
L
Linus Torvalds 已提交
676
{
677
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
P
Patrick Mochel 已提交
678
	acpi_status status;
Y
Yasuaki Ishimatsu 已提交
679
	unsigned long long sun;
680
	int result = 0;
L
Linus Torvalds 已提交
681 682

	/*
683
	 * Devices gotten from FADT don't have a "path" attribute
L
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684
	 */
685
	if (dev->handle) {
686
		result = device_create_file(&dev->dev, &dev_attr_path);
687
		if (result)
688
			goto end;
L
Linus Torvalds 已提交
689 690
	}

691 692 693 694
	if (!list_empty(&dev->pnp.ids)) {
		result = device_create_file(&dev->dev, &dev_attr_hid);
		if (result)
			goto end;
L
Linus Torvalds 已提交
695

696 697 698 699
		result = device_create_file(&dev->dev, &dev_attr_modalias);
		if (result)
			goto end;
	}
700

701 702 703
	/*
	 * If device has _STR, 'description' file is created
	 */
704
	if (acpi_has_method(dev->handle, "_STR")) {
705 706 707 708 709 710 711 712 713 714
		status = acpi_evaluate_object(dev->handle, "_STR",
					NULL, &buffer);
		if (ACPI_FAILURE(status))
			buffer.pointer = NULL;
		dev->pnp.str_obj = buffer.pointer;
		result = device_create_file(&dev->dev, &dev_attr_description);
		if (result)
			goto end;
	}

715
	if (dev->pnp.type.bus_address)
716 717 718 719
		result = device_create_file(&dev->dev, &dev_attr_adr);
	if (dev->pnp.unique_id)
		result = device_create_file(&dev->dev, &dev_attr_uid);

Y
Yasuaki Ishimatsu 已提交
720 721 722 723 724 725 726 727 728 729
	status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
	if (ACPI_SUCCESS(status)) {
		dev->pnp.sun = (unsigned long)sun;
		result = device_create_file(&dev->dev, &dev_attr_sun);
		if (result)
			goto end;
	} else {
		dev->pnp.sun = (unsigned long)-1;
	}

730 731 732 733 734 735
	if (acpi_has_method(dev->handle, "_STA")) {
		result = device_create_file(&dev->dev, &dev_attr_status);
		if (result)
			goto end;
	}

736 737 738 739
        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
740
	if (acpi_has_method(dev->handle, "_EJ0")) {
741
		result = device_create_file(&dev->dev, &dev_attr_eject);
742 743 744 745 746 747 748 749 750 751 752 753 754 755
		if (result)
			return result;
	}

	if (dev->flags.power_manageable) {
		result = device_create_file(&dev->dev, &dev_attr_power_state);
		if (result)
			return result;

		if (dev->power.flags.power_resources)
			result = device_create_file(&dev->dev,
						    &dev_attr_real_power_state);
	}

756
end:
757
	return result;
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}

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760
static void acpi_device_remove_files(struct acpi_device *dev)
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761
{
762 763 764 765 766 767 768
	if (dev->flags.power_manageable) {
		device_remove_file(&dev->dev, &dev_attr_power_state);
		if (dev->power.flags.power_resources)
			device_remove_file(&dev->dev,
					   &dev_attr_real_power_state);
	}

P
Patrick Mochel 已提交
769
	/*
770 771
	 * If device has _STR, remove 'description' file
	 */
772
	if (acpi_has_method(dev->handle, "_STR")) {
773 774 775 776 777
		kfree(dev->pnp.str_obj);
		device_remove_file(&dev->dev, &dev_attr_description);
	}
	/*
	 * If device has _EJ0, remove 'eject' file.
P
Patrick Mochel 已提交
778
	 */
779
	if (acpi_has_method(dev->handle, "_EJ0"))
P
Patrick Mochel 已提交
780
		device_remove_file(&dev->dev, &dev_attr_eject);
L
Linus Torvalds 已提交
781

782
	if (acpi_has_method(dev->handle, "_SUN"))
Y
Yasuaki Ishimatsu 已提交
783 784
		device_remove_file(&dev->dev, &dev_attr_sun);

785 786
	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
787
	if (dev->pnp.type.bus_address)
788
		device_remove_file(&dev->dev, &dev_attr_adr);
789 790
	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
791 792
	if (acpi_has_method(dev->handle, "_STA"))
		device_remove_file(&dev->dev, &dev_attr_status);
793
	if (dev->handle)
794
		device_remove_file(&dev->dev, &dev_attr_path);
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795 796
}
/* --------------------------------------------------------------------------
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797
			ACPI Bus operations
L
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798
   -------------------------------------------------------------------------- */
799

800 801
static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
802 803
{
	const struct acpi_device_id *id;
804
	struct acpi_hardware_id *hwid;
805

806 807 808 809 810
	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
811
		return NULL;
812

813 814 815
	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
				return id;

	return NULL;
}

/**
 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 * @ids: Array of struct acpi_device_id object to match against.
 * @dev: The device structure to match.
 *
 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 * object for that handle and use that object to match against a given list of
 * device IDs.
 *
 * Return a pointer to the first matching ID on success or %NULL on failure.
 */
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
					       const struct device *dev)
{
	struct acpi_device *adev;
836
	acpi_handle handle = ACPI_HANDLE(dev);
837

838
	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
839 840 841 842 843
		return NULL;

	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
844

845 846 847 848
int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
849 850 851
}
EXPORT_SYMBOL(acpi_match_device_ids);

852 853 854 855
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

856 857 858
	if (device->wakeup.flags.valid)
		acpi_power_resources_list_free(&device->wakeup.resources);

859 860 861 862 863 864 865
	if (!device->flags.power_manageable)
		return;

	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
		struct acpi_device_power_state *ps = &device->power.states[i];
		acpi_power_resources_list_free(&ps->resources);
	}
866 867
}

868
static void acpi_device_release(struct device *dev)
L
Linus Torvalds 已提交
869
{
870
	struct acpi_device *acpi_dev = to_acpi_device(dev);
L
Linus Torvalds 已提交
871

872
	acpi_free_pnp_ids(&acpi_dev->pnp);
873
	acpi_free_power_resources_lists(acpi_dev);
874
	kfree(acpi_dev);
L
Linus Torvalds 已提交
875 876
}

877
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
Z
Zhang Rui 已提交
878
{
879 880
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
L
Linus Torvalds 已提交
881

882
	return acpi_dev->flags.match_driver
883
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
884
}
L
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885

886
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
L
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887
{
888
	struct acpi_device *acpi_dev = to_acpi_device(dev);
889
	int len;
890

891 892 893
	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

894 895 896 897
	if (add_uevent_var(env, "MODALIAS="))
		return -ENOMEM;
	len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
			      sizeof(env->buf) - env->buflen);
898 899
	if (len <= 0)
		return len;
900
	env->buflen += len;
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901
	return 0;
L
Linus Torvalds 已提交
902 903
}

904 905 906 907 908 909 910 911 912 913 914
static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = data;

	device->driver->ops.notify(device, event);
}

static acpi_status acpi_device_notify_fixed(void *data)
{
	struct acpi_device *device = data;

915 916
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
917 918 919 920 921 922 923
	return AE_OK;
}

static int acpi_device_install_notify_handler(struct acpi_device *device)
{
	acpi_status status;

924
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
925 926 927 928
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
929
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						     acpi_device_notify_fixed,
						     device);
	else
		status = acpi_install_notify_handler(device->handle,
						     ACPI_DEVICE_NOTIFY,
						     acpi_device_notify,
						     device);

	if (ACPI_FAILURE(status))
		return -EINVAL;
	return 0;
}

static void acpi_device_remove_notify_handler(struct acpi_device *device)
{
947
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
948 949
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
950
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
951 952 953 954 955 956 957
		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
						acpi_device_notify_fixed);
	else
		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
					   acpi_device_notify);
}

958
static int acpi_device_probe(struct device *dev)
L
Linus Torvalds 已提交
959
{
960 961 962 963
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

964 965 966
	if (acpi_dev->handler)
		return -EINVAL;

967 968
	if (!acpi_drv->ops.add)
		return -ENOSYS;
969

970 971 972
	ret = acpi_drv->ops.add(acpi_dev);
	if (ret)
		return ret;
973

974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
	acpi_dev->driver = acpi_drv;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver [%s] successfully bound to device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));

	if (acpi_drv->ops.notify) {
		ret = acpi_device_install_notify_handler(acpi_dev);
		if (ret) {
			if (acpi_drv->ops.remove)
				acpi_drv->ops.remove(acpi_dev);

			acpi_dev->driver = NULL;
			acpi_dev->driver_data = NULL;
			return ret;
		}
989
	}
990 991 992 993 994

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));
	get_device(dev);
	return 0;
995
}
L
Linus Torvalds 已提交
996

997 998 999 1000 1001 1002
static int acpi_device_remove(struct device * dev)
{
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = acpi_dev->driver;

	if (acpi_drv) {
1003 1004
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
1005
		if (acpi_drv->ops.remove)
1006
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
1007
	}
1008
	acpi_dev->driver = NULL;
1009
	acpi_dev->driver_data = NULL;
L
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1010

1011
	put_device(dev);
Z
Zhang Rui 已提交
1012 1013
	return 0;
}
L
Linus Torvalds 已提交
1014

1015
struct bus_type acpi_bus_type = {
Z
Zhang Rui 已提交
1016
	.name		= "acpi",
1017 1018 1019 1020
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
Zhang Rui 已提交
1021 1022
};

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
static void acpi_device_del(struct acpi_device *device)
{
	mutex_lock(&acpi_device_lock);
	if (device->parent)
		list_del(&device->node);

	list_del(&device->wakeup_list);
	mutex_unlock(&acpi_device_lock);

	acpi_power_add_remove_device(device, false);
	acpi_device_remove_files(device);
	if (device->remove)
		device->remove(device);

	device_del(&device->dev);
}

static LIST_HEAD(acpi_device_del_list);
static DEFINE_MUTEX(acpi_device_del_lock);

static void acpi_device_del_work_fn(struct work_struct *work_not_used)
{
	for (;;) {
		struct acpi_device *adev;

		mutex_lock(&acpi_device_del_lock);

		if (list_empty(&acpi_device_del_list)) {
			mutex_unlock(&acpi_device_del_lock);
			break;
		}
		adev = list_first_entry(&acpi_device_del_list,
					struct acpi_device, del_list);
		list_del(&adev->del_list);

		mutex_unlock(&acpi_device_del_lock);

		acpi_device_del(adev);
		/*
		 * Drop references to all power resources that might have been
		 * used by the device.
		 */
		acpi_power_transition(adev, ACPI_STATE_D3_COLD);
		put_device(&adev->dev);
	}
}

/**
 * acpi_scan_drop_device - Drop an ACPI device object.
 * @handle: Handle of an ACPI namespace node, not used.
 * @context: Address of the ACPI device object to drop.
 *
 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 * namespace node the device object pointed to by @context is attached to.
 *
 * The unregistration is carried out asynchronously to avoid running
 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 * ensure the correct ordering (the device objects must be unregistered in the
 * same order in which the corresponding namespace nodes are deleted).
 */
static void acpi_scan_drop_device(acpi_handle handle, void *context)
1084
{
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
	static DECLARE_WORK(work, acpi_device_del_work_fn);
	struct acpi_device *adev = context;

	mutex_lock(&acpi_device_del_lock);

	/*
	 * Use the ACPI hotplug workqueue which is ordered, so this work item
	 * won't run after any hotplug work items submitted subsequently.  That
	 * prevents attempts to register device objects identical to those being
	 * deleted from happening concurrently (such attempts result from
	 * hotplug events handled via the ACPI hotplug workqueue).  It also will
	 * run after all of the work items submitted previosuly, which helps
	 * those work items to ensure that they are not accessing stale device
	 * objects.
	 */
	if (list_empty(&acpi_device_del_list))
		acpi_queue_hotplug_work(&work);

	list_add_tail(&adev->del_list, &acpi_device_del_list);
	/* Make acpi_ns_validate_handle() return NULL for this handle. */
	adev->handle = INVALID_ACPI_HANDLE;

	mutex_unlock(&acpi_device_del_lock);
1108 1109
}

1110 1111
static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
				void (*callback)(void *))
1112 1113 1114 1115 1116 1117
{
	acpi_status status;

	if (!device)
		return -EINVAL;

1118 1119
	status = acpi_get_data_full(handle, acpi_scan_drop_device,
				    (void **)device, callback);
1120 1121 1122 1123 1124 1125 1126
	if (ACPI_FAILURE(status) || !*device) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
				  handle));
		return -ENODEV;
	}
	return 0;
}
1127 1128 1129 1130 1131

int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
	return acpi_get_device_data(handle, device, NULL);
}
1132
EXPORT_SYMBOL(acpi_bus_get_device);
1133

1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
static void get_acpi_device(void *dev)
{
	if (dev)
		get_device(&((struct acpi_device *)dev)->dev);
}

struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
{
	struct acpi_device *adev = NULL;

	acpi_get_device_data(handle, &adev, get_acpi_device);
	return adev;
}

void acpi_bus_put_acpi_device(struct acpi_device *adev)
{
	put_device(&adev->dev);
}

1153 1154
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
L
Linus Torvalds 已提交
1155
{
L
Len Brown 已提交
1156
	int result;
1157 1158
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
1159

1160 1161 1162
	if (device->handle) {
		acpi_status status;

1163
		status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1164 1165 1166 1167 1168 1169 1170 1171
					  device);
		if (ACPI_FAILURE(status)) {
			acpi_handle_err(device->handle,
					"Unable to attach device data\n");
			return -ENODEV;
		}
	}

Z
Zhang Rui 已提交
1172 1173 1174 1175 1176 1177 1178 1179
	/*
	 * Linkage
	 * -------
	 * Link this device to its parent and siblings.
	 */
	INIT_LIST_HEAD(&device->children);
	INIT_LIST_HEAD(&device->node);
	INIT_LIST_HEAD(&device->wakeup_list);
1180
	INIT_LIST_HEAD(&device->physical_node_list);
1181
	INIT_LIST_HEAD(&device->del_list);
1182
	mutex_init(&device->physical_node_lock);
L
Linus Torvalds 已提交
1183

1184 1185
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
1186 1187 1188
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
L
Linus Torvalds 已提交
1189
	}
1190

1191
	mutex_lock(&acpi_device_lock);
1192 1193 1194 1195 1196
	/*
	 * Find suitable bus_id and instance number in acpi_bus_id_list
	 * If failed, create one and link it into acpi_bus_id_list
	 */
	list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
1197 1198 1199
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
1200 1201 1202 1203
			found = 1;
			kfree(new_bus_id);
			break;
		}
L
Linus Torvalds 已提交
1204
	}
1205
	if (!found) {
1206
		acpi_device_bus_id = new_bus_id;
1207
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1208 1209
		acpi_device_bus_id->instance_no = 0;
		list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
L
Linus Torvalds 已提交
1210
	}
1211
	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
L
Linus Torvalds 已提交
1212

L
Len Brown 已提交
1213
	if (device->parent)
Z
Zhang Rui 已提交
1214
		list_add_tail(&device->node, &device->parent->children);
L
Len Brown 已提交
1215

Z
Zhang Rui 已提交
1216 1217
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1218
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
1219

1220
	if (device->parent)
1221
		device->dev.parent = &device->parent->dev;
1222
	device->dev.bus = &acpi_bus_type;
1223
	device->dev.release = release;
1224
	result = device_add(&device->dev);
1225
	if (result) {
1226
		dev_err(&device->dev, "Error registering device\n");
1227
		goto err;
L
Linus Torvalds 已提交
1228 1229
	}

1230
	result = acpi_device_setup_files(device);
1231
	if (result)
1232 1233
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
L
Linus Torvalds 已提交
1234 1235

	return 0;
1236 1237

 err:
1238
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
1239
	if (device->parent)
1240 1241
		list_del(&device->node);
	list_del(&device->wakeup_list);
1242
	mutex_unlock(&acpi_device_lock);
1243 1244

 err_detach:
1245
	acpi_detach_data(device->handle, acpi_scan_drop_device);
1246
	return result;
L
Linus Torvalds 已提交
1247 1248
}

Z
Zhang Rui 已提交
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
/**
 * acpi_bus_register_driver - register a driver with the ACPI bus
 * @driver: driver being registered
 *
 * Registers a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and binds.  Returns zero for
 * success or a negative error status for failure.
 */
int acpi_bus_register_driver(struct acpi_driver *driver)
L
Linus Torvalds 已提交
1261
{
1262
	int ret;
L
Linus Torvalds 已提交
1263

Z
Zhang Rui 已提交
1264 1265
	if (acpi_disabled)
		return -ENODEV;
1266 1267 1268
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
1269

1270 1271
	ret = driver_register(&driver->drv);
	return ret;
Z
Zhang Rui 已提交
1272
}
L
Linus Torvalds 已提交
1273

Z
Zhang Rui 已提交
1274 1275 1276
EXPORT_SYMBOL(acpi_bus_register_driver);

/**
1277
 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
Z
Zhang Rui 已提交
1278 1279 1280 1281 1282 1283 1284
 * @driver: driver to unregister
 *
 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and unbinds.
 */
void acpi_bus_unregister_driver(struct acpi_driver *driver)
{
1285
	driver_unregister(&driver->drv);
Z
Zhang Rui 已提交
1286 1287 1288 1289 1290 1291 1292
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
1293 1294
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
1295
	struct acpi_device *device = NULL;
1296 1297 1298 1299 1300 1301 1302
	acpi_status status;

	/*
	 * Fixed hardware devices do not appear in the namespace and do not
	 * have handles, but we fabricate acpi_devices for them, so we have
	 * to deal with them specially.
	 */
1303
	if (!handle)
1304 1305 1306 1307 1308
		return acpi_root;

	do {
		status = acpi_get_parent(handle, &handle);
		if (ACPI_FAILURE(status))
1309 1310 1311
			return status == AE_NULL_ENTRY ? NULL : acpi_root;
	} while (acpi_bus_get_device(handle, &device));
	return device;
1312 1313
}

Z
Zhang Rui 已提交
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
acpi_status
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
{
	acpi_status status;
	acpi_handle tmp;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;

	status = acpi_get_handle(handle, "_EJD", &tmp);
	if (ACPI_FAILURE(status))
		return status;

	status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
	if (ACPI_SUCCESS(status)) {
		obj = buffer.pointer;
1329 1330
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
1331 1332 1333 1334 1335 1336
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

1337 1338
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
1339
{
1340 1341
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
1342
	union acpi_object *element = NULL;
1343
	acpi_status status;
1344
	int err = -ENODATA;
Z
Zhang Rui 已提交
1345

1346
	if (!wakeup)
1347
		return -EINVAL;
Z
Zhang Rui 已提交
1348

1349
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
1350

1351 1352 1353 1354
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1355
		return err;
1356 1357 1358 1359
	}

	package = (union acpi_object *)buffer.pointer;

1360
	if (!package || package->package.count < 2)
1361 1362
		goto out;

Z
Zhang Rui 已提交
1363
	element = &(package->package.elements[0]);
1364
	if (!element)
1365
		goto out;
1366

Z
Zhang Rui 已提交
1367 1368 1369 1370
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
1371
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1372
			goto out;
1373

1374
		wakeup->gpe_device =
Z
Zhang Rui 已提交
1375
		    element->package.elements[0].reference.handle;
1376
		wakeup->gpe_number =
Z
Zhang Rui 已提交
1377 1378
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
1379 1380 1381 1382 1383
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
1384 1385

	element = &(package->package.elements[1]);
1386
	if (element->type != ACPI_TYPE_INTEGER)
1387
		goto out;
1388

1389
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
1390

1391 1392
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
1393
		goto out;
Z
Zhang Rui 已提交
1394

1395 1396
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1397

1398 1399 1400 1401 1402 1403 1404 1405
		err = acpi_power_wakeup_list_init(&wakeup->resources,
						  &sleep_state);
		if (err) {
			acpi_handle_warn(handle, "Retrieving current states "
					 "of wakeup power resources failed\n");
			acpi_power_resources_list_free(&wakeup->resources);
			goto out;
		}
1406 1407 1408 1409 1410 1411 1412
		if (sleep_state < wakeup->sleep_state) {
			acpi_handle_warn(handle, "Overriding _PRW sleep state "
					 "(S%d) by S%d from power resources\n",
					 (int)wakeup->sleep_state, sleep_state);
			wakeup->sleep_state = sleep_state;
		}
	}
L
Lin Ming 已提交
1413
	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1414

1415 1416
 out:
	kfree(buffer.pointer);
1417
	return err;
L
Linus Torvalds 已提交
1418 1419
}

1420
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1421
{
1422 1423
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1424
		{"PNP0C0D", 0},
1425 1426 1427
		{"PNP0C0E", 0},
		{"", 0},
	};
1428 1429 1430
	acpi_status status;
	acpi_event_status event_status;

1431
	device->wakeup.flags.notifier_present = 0;
1432 1433 1434 1435

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
		device->wakeup.flags.run_wake = 1;
1436 1437 1438 1439 1440
		if (!acpi_match_device_ids(device, &button_device_ids[1])) {
			/* Do not use Lid/sleep button for S5 wakeup */
			if (device->wakeup.sleep_state == ACPI_STATE_S5)
				device->wakeup.sleep_state = ACPI_STATE_S4;
		}
1441
		device_set_wakeup_capable(&device->dev, true);
1442 1443 1444
		return;
	}

1445 1446 1447
	status = acpi_get_gpe_status(device->wakeup.gpe_device,
					device->wakeup.gpe_number,
						&event_status);
1448 1449 1450 1451 1452
	if (status == AE_OK)
		device->wakeup.flags.run_wake =
				!!(event_status & ACPI_EVENT_FLAG_HANDLE);
}

1453
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1454
{
1455
	int err;
1456

1457
	/* Presence of _PRW indicates wake capable */
1458
	if (!acpi_has_method(device->handle, "_PRW"))
1459 1460
		return;

1461 1462 1463 1464
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1465
		return;
Z
Zhang Rui 已提交
1466
	}
L
Linus Torvalds 已提交
1467

Z
Zhang Rui 已提交
1468
	device->wakeup.flags.valid = 1;
1469
	device->wakeup.prepare_count = 0;
1470
	acpi_bus_set_run_wake_flags(device);
1471 1472 1473 1474 1475 1476
	/* Call _PSW/_DSW object to disable its ability to wake the sleeping
	 * system for the ACPI device with the _PRW object.
	 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
	 * So it is necessary to call _DSW object first. Only when it is not
	 * present will the _PSW object used.
	 */
1477 1478
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1479 1480
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1481 1482
}

1483 1484 1485
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1486 1487
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1488
	acpi_status status;
1489

1490 1491
	INIT_LIST_HEAD(&ps->resources);

1492 1493 1494 1495 1496 1497 1498 1499
	/* Evaluate "_PRx" to get referenced power resources */
	status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
	if (ACPI_SUCCESS(status)) {
		union acpi_object *package = buffer.pointer;

		if (buffer.length && package
		    && package->type == ACPI_TYPE_PACKAGE
		    && package->package.count) {
1500 1501 1502
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1503
				device->power.flags.power_resources = 1;
1504
		}
1505
		ACPI_FREE(buffer.pointer);
1506 1507 1508
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1509
	pathname[2] = 'S';
1510
	if (acpi_has_method(device->handle, pathname))
1511 1512 1513 1514 1515 1516
		ps->flags.explicit_set = 1;

	/*
	 * State is valid if there are means to put the device into it.
	 * D3hot is only valid if _PR3 present.
	 */
1517
	if (!list_empty(&ps->resources)
1518 1519 1520 1521 1522 1523 1524 1525 1526
	    || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
		ps->flags.valid = 1;
		ps->flags.os_accessible = 1;
	}

	ps->power = -1;		/* Unknown - driver assigned */
	ps->latency = -1;	/* Unknown - driver assigned */
}

1527
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1528
{
1529
	u32 i;
B
Bjorn Helgaas 已提交
1530

1531
	/* Presence of _PS0|_PR0 indicates 'power manageable' */
1532 1533 1534
	if (!acpi_has_method(device->handle, "_PS0") &&
	    !acpi_has_method(device->handle, "_PR0"))
		return;
B
Bjorn Helgaas 已提交
1535

1536
	device->flags.power_manageable = 1;
L
Len Brown 已提交
1537

Z
Zhang Rui 已提交
1538 1539 1540
	/*
	 * Power Management Flags
	 */
1541
	if (acpi_has_method(device->handle, "_PSC"))
Z
Zhang Rui 已提交
1542
		device->power.flags.explicit_get = 1;
1543
	if (acpi_has_method(device->handle, "_IRC"))
Z
Zhang Rui 已提交
1544
		device->power.flags.inrush_current = 1;
L
Linus Torvalds 已提交
1545

Z
Zhang Rui 已提交
1546 1547 1548
	/*
	 * Enumerate supported power management states
	 */
1549 1550
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1551

1552
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1553

Z
Zhang Rui 已提交
1554 1555 1556
	/* Set defaults for D0 and D3 states (always valid) */
	device->power.states[ACPI_STATE_D0].flags.valid = 1;
	device->power.states[ACPI_STATE_D0].power = 100;
1557 1558
	device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
	device->power.states[ACPI_STATE_D3_COLD].power = 0;
L
Len Brown 已提交
1559

1560 1561 1562 1563
	/* Set D3cold's explicit_set flag if _PS3 exists. */
	if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
		device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;

1564 1565 1566 1567 1568
	/* Presence of _PS3 or _PRx means we can put the device into D3 cold */
	if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
			device->power.flags.power_resources)
		device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;

1569 1570 1571 1572
	if (acpi_bus_init_power(device)) {
		acpi_free_power_resources_lists(device);
		device->flags.power_manageable = 0;
	}
Z
Zhang Rui 已提交
1573
}
L
Len Brown 已提交
1574

1575
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1576 1577
{
	/* Presence of _STA indicates 'dynamic_status' */
1578
	if (acpi_has_method(device->handle, "_STA"))
L
Linus Torvalds 已提交
1579 1580 1581
		device->flags.dynamic_status = 1;

	/* Presence of _RMV indicates 'removable' */
1582
	if (acpi_has_method(device->handle, "_RMV"))
L
Linus Torvalds 已提交
1583 1584 1585
		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
1586 1587
	if (acpi_has_method(device->handle, "_EJD") ||
	    acpi_has_method(device->handle, "_EJ0"))
L
Linus Torvalds 已提交
1588 1589 1590
		device->flags.ejectable = 1;
}

1591
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1592
{
L
Len Brown 已提交
1593 1594 1595
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1596 1597 1598 1599 1600 1601 1602

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1603
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1604
		strcpy(device->pnp.bus_id, "ACPI");
1605 1606 1607 1608
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1609 1610 1611 1612 1613 1614 1615
	case ACPI_BUS_TYPE_POWER_BUTTON:
		strcpy(device->pnp.bus_id, "PWRF");
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
		strcpy(device->pnp.bus_id, "SLPF");
		break;
	default:
1616
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628
		/* Clean up trailing underscores (if any) */
		for (i = 3; i > 1; i--) {
			if (bus_id[i] == '_')
				bus_id[i] = '\0';
			else
				break;
		}
		strcpy(device->pnp.bus_id, bus_id);
		break;
	}
}

1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
/*
 * acpi_ata_match - see if an acpi object is an ATA device
 *
 * If an acpi object has one of the ACPI ATA methods defined,
 * then we can safely call it an ATA device.
 */
bool acpi_ata_match(acpi_handle handle)
{
	return acpi_has_method(handle, "_GTF") ||
	       acpi_has_method(handle, "_GTM") ||
	       acpi_has_method(handle, "_STM") ||
	       acpi_has_method(handle, "_SDD");
}

1643
/*
1644
 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1645 1646 1647 1648
 *
 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 * then we can safely call it an ejectable drive bay
 */
1649
bool acpi_bay_match(acpi_handle handle)
1650
{
1651 1652
	acpi_handle phandle;

1653
	if (!acpi_has_method(handle, "_EJ0"))
1654 1655 1656 1657 1658
		return false;
	if (acpi_ata_match(handle))
		return true;
	if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
		return false;
1659

1660
	return acpi_ata_match(phandle);
1661 1662
}

1663
/*
1664
 * acpi_dock_match - see if an acpi object has a _DCK method
1665
 */
1666
bool acpi_dock_match(acpi_handle handle)
1667
{
1668
	return acpi_has_method(handle, "_DCK");
1669 1670
}

1671
const char *acpi_device_hid(struct acpi_device *device)
1672
{
1673
	struct acpi_hardware_id *hid;
1674

1675 1676 1677
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1678 1679 1680 1681
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1682

1683
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1684 1685
{
	struct acpi_hardware_id *id;
1686

1687 1688 1689
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1690

T
Thomas Meyer 已提交
1691
	id->id = kstrdup(dev_id, GFP_KERNEL);
1692 1693 1694
	if (!id->id) {
		kfree(id);
		return;
1695 1696
	}

1697 1698
	list_add_tail(&id->list, &pnp->ids);
	pnp->type.hardware_id = 1;
1699 1700
}

1701 1702 1703 1704 1705
/*
 * Old IBM workstations have a DSDT bug wherein the SMBus object
 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
 * prefix.  Work around this.
 */
1706
static bool acpi_ibm_smbus_match(acpi_handle handle)
1707
{
1708 1709
	char node_name[ACPI_PATH_SEGMENT_LENGTH];
	struct acpi_buffer path = { sizeof(node_name), node_name };
1710 1711

	if (!dmi_name_in_vendors("IBM"))
1712
		return false;
1713 1714

	/* Look for SMBS object */
1715 1716 1717
	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
	    strcmp("SMBS", path.pointer))
		return false;
1718 1719

	/* Does it have the necessary (but misnamed) methods? */
1720 1721 1722
	if (acpi_has_method(handle, "SBI") &&
	    acpi_has_method(handle, "SBR") &&
	    acpi_has_method(handle, "SBW"))
1723 1724 1725
		return true;

	return false;
1726 1727
}

1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
static bool acpi_object_is_system_bus(acpi_handle handle)
{
	acpi_handle tmp;

	if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
	    tmp == handle)
		return true;
	if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
	    tmp == handle)
		return true;

	return false;
}

1742 1743
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
				int device_type)
L
Linus Torvalds 已提交
1744
{
L
Len Brown 已提交
1745
	acpi_status status;
1746
	struct acpi_device_info *info;
1747
	struct acpi_pnp_device_id_list *cid_list;
1748
	int i;
L
Linus Torvalds 已提交
1749

1750
	switch (device_type) {
L
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1751
	case ACPI_BUS_TYPE_DEVICE:
1752 1753
		if (handle == ACPI_ROOT_OBJECT) {
			acpi_add_id(pnp, ACPI_SYSTEM_HID);
1754 1755 1756
			break;
		}

1757
		status = acpi_get_object_info(handle, &info);
L
Linus Torvalds 已提交
1758
		if (ACPI_FAILURE(status)) {
1759 1760
			pr_err(PREFIX "%s: Error reading device info\n",
					__func__);
L
Linus Torvalds 已提交
1761 1762 1763 1764
			return;
		}

		if (info->valid & ACPI_VALID_HID)
1765
			acpi_add_id(pnp, info->hardware_id.string);
1766
		if (info->valid & ACPI_VALID_CID) {
1767
			cid_list = &info->compatible_id_list;
1768
			for (i = 0; i < cid_list->count; i++)
1769
				acpi_add_id(pnp, cid_list->ids[i].string);
1770
		}
L
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1771
		if (info->valid & ACPI_VALID_ADR) {
1772 1773
			pnp->bus_address = info->address;
			pnp->type.bus_address = 1;
L
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1774
		}
1775
		if (info->valid & ACPI_VALID_UID)
1776
			pnp->unique_id = kstrdup(info->unique_id.string,
1777
							GFP_KERNEL);
1778

1779 1780
		kfree(info);

1781 1782 1783 1784
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1785 1786
		if (acpi_is_video_device(handle))
			acpi_add_id(pnp, ACPI_VIDEO_HID);
1787
		else if (acpi_bay_match(handle))
1788
			acpi_add_id(pnp, ACPI_BAY_HID);
1789
		else if (acpi_dock_match(handle))
1790
			acpi_add_id(pnp, ACPI_DOCK_HID);
1791
		else if (acpi_ibm_smbus_match(handle))
1792
			acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1793 1794 1795 1796
		else if (list_empty(&pnp->ids) &&
			 acpi_object_is_system_bus(handle)) {
			/* \_SB, \_TZ, LNXSYBUS */
			acpi_add_id(pnp, ACPI_BUS_HID);
1797 1798
			strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
			strcpy(pnp->device_class, ACPI_BUS_CLASS);
1799
		}
1800

L
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1801 1802
		break;
	case ACPI_BUS_TYPE_POWER:
1803
		acpi_add_id(pnp, ACPI_POWER_HID);
L
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1804 1805
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1806
		acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
L
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1807 1808
		break;
	case ACPI_BUS_TYPE_THERMAL:
1809
		acpi_add_id(pnp, ACPI_THERMAL_HID);
L
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1810 1811
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1812
		acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
L
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1813 1814
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1815
		acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
L
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1816 1817 1818 1819
		break;
	}
}

1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
{
	struct acpi_hardware_id *id, *tmp;

	list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
		kfree(id->id);
		kfree(id);
	}
	kfree(pnp->unique_id);
}

1831 1832
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
1833
{
1834 1835 1836 1837
	INIT_LIST_HEAD(&device->pnp.ids);
	device->device_type = type;
	device->handle = handle;
	device->parent = acpi_bus_get_parent(handle);
1838
	acpi_set_device_status(device, sta);
1839
	acpi_device_get_busid(device);
1840
	acpi_set_pnp_ids(handle, &device->pnp, type);
1841
	acpi_bus_get_flags(device);
1842
	device->flags.match_driver = false;
1843 1844
	device->flags.initialized = true;
	device->flags.visited = false;
1845 1846 1847
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
1848

1849 1850 1851 1852
void acpi_device_add_finalize(struct acpi_device *device)
{
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
L
Linus Torvalds 已提交
1853 1854
}

1855 1856
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
1857
				  unsigned long long sta)
L
Linus Torvalds 已提交
1858
{
1859 1860
	int result;
	struct acpi_device *device;
1861
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
1862

1863
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
Linus Torvalds 已提交
1864
	if (!device) {
1865
		printk(KERN_ERR PREFIX "Memory allocation error\n");
1866
		return -ENOMEM;
L
Linus Torvalds 已提交
1867 1868
	}

1869 1870
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
1871
	acpi_bus_get_wakeup_device_flags(device);
L
Linus Torvalds 已提交
1872

1873
	result = acpi_device_add(device, acpi_device_release);
1874
	if (result) {
1875
		acpi_device_release(&device->dev);
1876 1877
		return result;
	}
L
Linus Torvalds 已提交
1878

1879
	acpi_power_add_remove_device(device, true);
1880
	acpi_device_add_finalize(device);
1881 1882 1883 1884 1885 1886 1887
	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
		dev_name(&device->dev), (char *) buffer.pointer,
		device->parent ? dev_name(&device->parent->dev) : "(null)"));
	kfree(buffer.pointer);
	*child = device;
	return 0;
1888 1889
}

1890 1891
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
1892
{
1893 1894
	acpi_status status;
	acpi_object_type acpi_type;
L
Linus Torvalds 已提交
1895

1896
	status = acpi_get_type(handle, &acpi_type);
1897
	if (ACPI_FAILURE(status))
1898
		return -ENODEV;
L
Len Brown 已提交
1899

1900
	switch (acpi_type) {
1901 1902
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
1903 1904 1905 1906
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1907 1908
		break;
	case ACPI_TYPE_PROCESSOR:
1909 1910 1911 1912
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1913 1914
		break;
	case ACPI_TYPE_THERMAL:
1915 1916
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
1917 1918
		break;
	case ACPI_TYPE_POWER:
1919 1920
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
1921 1922
		break;
	default:
1923
		return -ENODEV;
1924
	}
L
Linus Torvalds 已提交
1925

1926 1927 1928
	return 0;
}

1929 1930 1931 1932 1933 1934 1935 1936 1937
bool acpi_device_is_present(struct acpi_device *adev)
{
	if (adev->status.present || adev->status.functional)
		return true;

	adev->flags.initialized = false;
	return false;
}

1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
				       char *idstr,
				       const struct acpi_device_id **matchid)
{
	const struct acpi_device_id *devid;

	for (devid = handler->ids; devid->id[0]; devid++)
		if (!strcmp((char *)devid->id, idstr)) {
			if (matchid)
				*matchid = devid;

			return true;
		}

	return false;
}

1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966
static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
					const struct acpi_device_id **matchid)
{
	struct acpi_scan_handler *handler;

	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
		if (acpi_scan_handler_matching(handler, idstr, matchid))
			return handler;

	return NULL;
}

1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
{
	if (!!hotplug->enabled == !!val)
		return;

	mutex_lock(&acpi_scan_lock);

	hotplug->enabled = val;

	mutex_unlock(&acpi_scan_lock);
}

1979
static void acpi_scan_init_hotplug(struct acpi_device *adev)
1980
{
1981
	struct acpi_hardware_id *hwid;
1982

1983 1984
	list_for_each_entry(hwid, &adev->pnp.ids, list) {
		struct acpi_scan_handler *handler;
1985

1986
		handler = acpi_scan_match_handler(hwid->id, NULL);
1987
		if (handler) {
1988
			adev->flags.hotplug_notify = true;
1989 1990 1991
			break;
		}
	}
1992 1993
}

1994 1995
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
1996
{
1997
	struct acpi_device *device = NULL;
1998 1999 2000 2001
	int type;
	unsigned long long sta;
	int result;

2002 2003 2004 2005
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

2006 2007 2008 2009
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

2010 2011 2012 2013 2014
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

2015
	acpi_add_single_object(&device, handle, type, sta);
2016
	if (!device)
2017
		return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
2018

2019 2020
	acpi_scan_init_hotplug(device);

2021
 out:
2022 2023
	if (!*return_value)
		*return_value = device;
2024

2025 2026
	return AE_OK;
}
2027

2028
static int acpi_scan_attach_handler(struct acpi_device *device)
2029
{
2030 2031
	struct acpi_hardware_id *hwid;
	int ret = 0;
2032

2033
	list_for_each_entry(hwid, &device->pnp.ids, list) {
2034
		const struct acpi_device_id *devid;
2035
		struct acpi_scan_handler *handler;
2036

2037 2038
		handler = acpi_scan_match_handler(hwid->id, &devid);
		if (handler) {
2039 2040 2041
			ret = handler->attach(device, devid);
			if (ret > 0) {
				device->handler = handler;
2042
				break;
2043
			} else if (ret < 0) {
2044
				break;
2045
			}
2046 2047 2048 2049 2050
		}
	}
	return ret;
}

2051
static void acpi_bus_attach(struct acpi_device *device)
2052
{
2053
	struct acpi_device *child;
2054
	int ret;
2055

2056
	acpi_bus_get_status(device);
2057
	/* Skip devices that are not present. */
2058 2059 2060 2061
	if (!acpi_device_is_present(device)) {
		device->flags.visited = false;
		return;
	}
2062
	if (device->handler)
2063
		goto ok;
2064

2065 2066 2067 2068
	if (!device->flags.initialized) {
		acpi_bus_update_power(device, NULL);
		device->flags.initialized = true;
	}
2069
	device->flags.visited = false;
2070
	ret = acpi_scan_attach_handler(device);
2071
	if (ret < 0)
2072
		return;
2073 2074

	device->flags.match_driver = true;
2075 2076 2077 2078 2079
	if (!ret) {
		ret = device_attach(&device->dev);
		if (ret < 0)
			return;
	}
2080 2081
	device->flags.visited = true;

2082 2083 2084
 ok:
	list_for_each_entry(child, &device->children, node)
		acpi_bus_attach(child);
L
Linus Torvalds 已提交
2085 2086
}

2087
/**
2088
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2089
 * @handle: Root of the namespace scope to scan.
2090
 *
2091 2092
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
2093
 *
2094 2095 2096 2097
 * If no devices were found, -ENODEV is returned, but it does not mean that
 * there has been a real error.  There just have been no suitable ACPI objects
 * in the table trunk from which the kernel could create a device and add an
 * appropriate driver.
2098 2099
 *
 * Must be called under acpi_scan_lock.
2100
 */
2101
int acpi_bus_scan(acpi_handle handle)
2102
{
2103
	void *device = NULL;
2104

2105 2106 2107
	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_check_add, NULL, NULL, &device);
2108

2109 2110 2111
	if (device) {
		acpi_bus_attach(device);
		return 0;
2112
	}
2113
	return -ENODEV;
2114
}
2115
EXPORT_SYMBOL(acpi_bus_scan);
L
Linus Torvalds 已提交
2116

2117
/**
2118 2119
 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
 * @adev: Root of the ACPI namespace scope to walk.
2120 2121 2122
 *
 * Must be called under acpi_scan_lock.
 */
2123
void acpi_bus_trim(struct acpi_device *adev)
L
Linus Torvalds 已提交
2124
{
2125 2126 2127 2128 2129 2130
	struct acpi_scan_handler *handler = adev->handler;
	struct acpi_device *child;

	list_for_each_entry_reverse(child, &adev->children, node)
		acpi_bus_trim(child);

2131
	adev->flags.match_driver = false;
2132 2133 2134 2135 2136 2137 2138 2139
	if (handler) {
		if (handler->detach)
			handler->detach(adev);

		adev->handler = NULL;
	} else {
		device_release_driver(&adev->dev);
	}
2140
	/*
2141 2142
	 * Most likely, the device is going away, so put it into D3cold before
	 * that.
2143
	 */
2144 2145 2146
	acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
	adev->flags.initialized = false;
	adev->flags.visited = false;
L
Linus Torvalds 已提交
2147
}
2148 2149
EXPORT_SYMBOL_GPL(acpi_bus_trim);

2150
static int acpi_bus_scan_fixed(void)
L
Linus Torvalds 已提交
2151
{
L
Len Brown 已提交
2152
	int result = 0;
L
Li Shaohua 已提交
2153

L
Linus Torvalds 已提交
2154 2155 2156
	/*
	 * Enumerate all fixed-feature devices.
	 */
2157 2158 2159
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

2160
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2161
						ACPI_BUS_TYPE_POWER_BUTTON,
2162 2163 2164 2165
						ACPI_STA_DEFAULT);
		if (result)
			return result;

2166
		device->flags.match_driver = true;
2167 2168 2169 2170
		result = device_attach(&device->dev);
		if (result < 0)
			return result;

2171
		device_init_wakeup(&device->dev, true);
2172
	}
L
Linus Torvalds 已提交
2173

2174 2175 2176
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

2177
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2178
						ACPI_BUS_TYPE_SLEEP_BUTTON,
2179 2180 2181 2182
						ACPI_STA_DEFAULT);
		if (result)
			return result;

2183
		device->flags.match_driver = true;
2184
		result = device_attach(&device->dev);
2185
	}
L
Linus Torvalds 已提交
2186

2187
	return result < 0 ? result : 0;
L
Linus Torvalds 已提交
2188 2189
}

2190
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
2191 2192 2193
{
	int result;

2194 2195 2196 2197 2198 2199
	result = bus_register(&acpi_bus_type);
	if (result) {
		/* We don't want to quit even if we failed to add suspend/resume */
		printk(KERN_ERR PREFIX "Could not register bus type\n");
	}

2200
	acpi_pci_root_init();
2201
	acpi_pci_link_init();
2202
	acpi_processor_init();
2203
	acpi_platform_init();
2204
	acpi_lpss_init();
2205
	acpi_cmos_rtc_init();
2206
	acpi_container_init();
2207
	acpi_memory_hotplug_init();
2208
	acpi_dock_init();
2209

2210
	mutex_lock(&acpi_scan_lock);
L
Linus Torvalds 已提交
2211 2212 2213
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
2214 2215
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
2216
		goto out;
L
Linus Torvalds 已提交
2217

2218
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
2219
	if (result)
2220
		goto out;
L
Linus Torvalds 已提交
2221

2222 2223
	result = acpi_bus_scan_fixed();
	if (result) {
2224 2225 2226
		acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
		acpi_device_del(acpi_root);
		put_device(&acpi_root->dev);
2227
		goto out;
2228
	}
L
Linus Torvalds 已提交
2229

2230
	acpi_update_all_gpes();
2231 2232 2233 2234

 out:
	mutex_unlock(&acpi_scan_lock);
	return result;
L
Linus Torvalds 已提交
2235
}