scan.c 54.2 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 <acpi/acpi_drivers.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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#define STRUCT_TO_INT(s)	(*((int*)&s))
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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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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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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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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 || count >= size)
			return -EINVAL;
		len += count;
		size -= count;
	}

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

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;

	/* Device has no HID and no CID or string is >1024 */
	len = create_modalias(acpi_dev, buf, 1024);
	if (len <= 0)
		return 0;
	buf[len++] = '\n';
	return len;
}
static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);

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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_hot_remove(struct acpi_device *device)
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{
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	acpi_handle handle = device->handle;
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	struct device *errdev;
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	acpi_status status;
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	unsigned long long sta;
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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.
	 */
	errdev = NULL;
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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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	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 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;

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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
	 * are holding acpi_scan_lock, but it may have become invalid before
	 * that lock was acquired.
	 */
	if (adev->handle == INVALID_ACPI_HANDLE)
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		goto out;
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	switch (src) {
	case ACPI_NOTIFY_BUS_CHECK:
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		error = acpi_scan_bus_check(adev);
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		break;
	case ACPI_NOTIFY_DEVICE_CHECK:
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		error = acpi_scan_device_check(adev);
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		break;
	case ACPI_NOTIFY_EJECT_REQUEST:
	case ACPI_OST_EC_OSPM_EJECT:
		error = acpi_scan_hot_remove(adev);
		break;
	default:
		error = -EINVAL;
		break;
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	}
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	if (!error)
		ost_code = ACPI_OST_SC_SUCCESS;
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 out:
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	acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL);
	put_device(&adev->dev);
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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 void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
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{
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	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
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	struct acpi_scan_handler *handler = data;
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	struct acpi_device *adev;
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	acpi_status status;

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	if (acpi_bus_get_device(handle, &adev))
		goto err_out;

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	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
		break;
	case ACPI_NOTIFY_DEVICE_CHECK:
		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
		break;
	case ACPI_NOTIFY_EJECT_REQUEST:
		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
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		if (!handler->hotplug.enabled) {
			acpi_handle_err(handle, "Eject disabled\n");
			ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
			goto err_out;
		}
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		acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
					  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
		break;
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	default:
		/* non-hotplug event; possibly handled by other handler */
		return;
	}
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	get_device(&adev->dev);
	status = acpi_hotplug_execute(acpi_device_hotplug, adev, type);
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	if (ACPI_SUCCESS(status))
		return;
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	put_device(&adev->dev);

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 err_out:
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	acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
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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;

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	acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
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				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
	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);

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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);

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static int acpi_device_setup_files(struct acpi_device *dev)
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{
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	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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	acpi_status status;
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	unsigned long long sun;
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	int result = 0;
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	/*
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	 * Devices gotten from FADT don't have a "path" attribute
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	 */
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	if (dev->handle) {
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		result = device_create_file(&dev->dev, &dev_attr_path);
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		if (result)
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			goto end;
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	}

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	if (!list_empty(&dev->pnp.ids)) {
		result = device_create_file(&dev->dev, &dev_attr_hid);
		if (result)
			goto end;
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		result = device_create_file(&dev->dev, &dev_attr_modalias);
		if (result)
			goto end;
	}
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	/*
	 * If device has _STR, 'description' file is created
	 */
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	if (acpi_has_method(dev->handle, "_STR")) {
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		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;
	}

613
	if (dev->pnp.type.bus_address)
614 615 616 617
		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
618 619 620 621 622 623 624 625 626 627
	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;
	}

628 629 630 631
        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
632
	if (acpi_has_method(dev->handle, "_EJ0")) {
633
		result = device_create_file(&dev->dev, &dev_attr_eject);
634 635 636 637 638 639 640 641 642 643 644 645 646 647
		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);
	}

648
end:
649
	return result;
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650 651
}

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652
static void acpi_device_remove_files(struct acpi_device *dev)
L
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653
{
654 655 656 657 658 659 660
	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
661
	/*
662 663
	 * If device has _STR, remove 'description' file
	 */
664
	if (acpi_has_method(dev->handle, "_STR")) {
665 666 667 668 669
		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
670
	 */
671
	if (acpi_has_method(dev->handle, "_EJ0"))
P
Patrick Mochel 已提交
672
		device_remove_file(&dev->dev, &dev_attr_eject);
L
Linus Torvalds 已提交
673

674
	if (acpi_has_method(dev->handle, "_SUN"))
Y
Yasuaki Ishimatsu 已提交
675 676
		device_remove_file(&dev->dev, &dev_attr_sun);

677 678
	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
679
	if (dev->pnp.type.bus_address)
680
		device_remove_file(&dev->dev, &dev_attr_adr);
681 682
	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
683
	if (dev->handle)
684
		device_remove_file(&dev->dev, &dev_attr_path);
L
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685 686
}
/* --------------------------------------------------------------------------
Z
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687
			ACPI Bus operations
L
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688
   -------------------------------------------------------------------------- */
689

690 691
static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
692 693
{
	const struct acpi_device_id *id;
694
	struct acpi_hardware_id *hwid;
695

696 697 698 699 700
	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
701
		return NULL;
702

703 704 705
	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
				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;
726
	acpi_handle handle = ACPI_HANDLE(dev);
727

728
	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
729 730 731 732 733
		return NULL;

	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
734

735 736 737 738
int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
739 740 741
}
EXPORT_SYMBOL(acpi_match_device_ids);

742 743 744 745
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

746 747 748
	if (device->wakeup.flags.valid)
		acpi_power_resources_list_free(&device->wakeup.resources);

749 750 751 752 753 754 755
	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);
	}
756 757
}

758
static void acpi_device_release(struct device *dev)
L
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759
{
760
	struct acpi_device *acpi_dev = to_acpi_device(dev);
L
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761

762
	acpi_free_pnp_ids(&acpi_dev->pnp);
763
	acpi_free_power_resources_lists(acpi_dev);
764
	kfree(acpi_dev);
L
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765 766
}

767
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
Z
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768
{
769 770
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
L
Linus Torvalds 已提交
771

772
	return acpi_dev->flags.match_driver
773
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
774
}
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775

776
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
L
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777
{
778
	struct acpi_device *acpi_dev = to_acpi_device(dev);
779
	int len;
780

781 782 783
	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

784 785 786 787 788 789 790
	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 >= (sizeof(env->buf) - env->buflen))
		return -ENOMEM;
	env->buflen += len;
Z
Zhang Rui 已提交
791
	return 0;
L
Linus Torvalds 已提交
792 793
}

794 795 796 797 798 799 800 801 802 803 804
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;

805 806
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
807 808 809 810 811 812 813
	return AE_OK;
}

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

814
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
815 816 817 818
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
819
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
		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)
{
837
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
838 839
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
840
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
841 842 843 844 845 846 847
		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);
}

848
static int acpi_device_probe(struct device *dev)
L
Linus Torvalds 已提交
849
{
850 851 852 853
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

854 855 856
	if (acpi_dev->handler)
		return -EINVAL;

857 858
	if (!acpi_drv->ops.add)
		return -ENOSYS;
859

860 861 862
	ret = acpi_drv->ops.add(acpi_dev);
	if (ret)
		return ret;
863

864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
	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;
		}
879
	}
880 881 882 883 884

	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;
885
}
L
Linus Torvalds 已提交
886

887 888 889 890 891 892
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) {
893 894
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
895
		if (acpi_drv->ops.remove)
896
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
897
	}
898
	acpi_dev->driver = NULL;
899
	acpi_dev->driver_data = NULL;
L
Linus Torvalds 已提交
900

901
	put_device(dev);
Z
Zhang Rui 已提交
902 903
	return 0;
}
L
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904

905
struct bus_type acpi_bus_type = {
Z
Zhang Rui 已提交
906
	.name		= "acpi",
907 908 909 910
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
Zhang Rui 已提交
911 912
};

913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
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)
974
{
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997
	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);
998 999 1000 1001 1002 1003 1004 1005 1006
}

int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
	acpi_status status;

	if (!device)
		return -EINVAL;

1007
	status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device);
1008 1009 1010 1011 1012 1013 1014
	if (ACPI_FAILURE(status) || !*device) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
				  handle));
		return -ENODEV;
	}
	return 0;
}
1015
EXPORT_SYMBOL(acpi_bus_get_device);
1016

1017 1018
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
L
Linus Torvalds 已提交
1019
{
L
Len Brown 已提交
1020
	int result;
1021 1022
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
1023

1024 1025 1026
	if (device->handle) {
		acpi_status status;

1027
		status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1028 1029 1030 1031 1032 1033 1034 1035
					  device);
		if (ACPI_FAILURE(status)) {
			acpi_handle_err(device->handle,
					"Unable to attach device data\n");
			return -ENODEV;
		}
	}

Z
Zhang Rui 已提交
1036 1037 1038 1039 1040 1041 1042 1043
	/*
	 * 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);
1044
	INIT_LIST_HEAD(&device->physical_node_list);
1045
	INIT_LIST_HEAD(&device->del_list);
1046
	mutex_init(&device->physical_node_lock);
L
Linus Torvalds 已提交
1047

1048 1049
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
1050 1051 1052
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
L
Linus Torvalds 已提交
1053
	}
1054

1055
	mutex_lock(&acpi_device_lock);
1056 1057 1058 1059 1060
	/*
	 * 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) {
1061 1062 1063
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
1064 1065 1066 1067
			found = 1;
			kfree(new_bus_id);
			break;
		}
L
Linus Torvalds 已提交
1068
	}
1069
	if (!found) {
1070
		acpi_device_bus_id = new_bus_id;
1071
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1072 1073
		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
1074
	}
1075
	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
1076

L
Len Brown 已提交
1077
	if (device->parent)
Z
Zhang Rui 已提交
1078
		list_add_tail(&device->node, &device->parent->children);
L
Len Brown 已提交
1079

Z
Zhang Rui 已提交
1080 1081
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1082
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
1083

1084
	if (device->parent)
1085
		device->dev.parent = &device->parent->dev;
1086
	device->dev.bus = &acpi_bus_type;
1087
	device->dev.release = release;
1088
	result = device_add(&device->dev);
1089
	if (result) {
1090
		dev_err(&device->dev, "Error registering device\n");
1091
		goto err;
L
Linus Torvalds 已提交
1092 1093
	}

1094
	result = acpi_device_setup_files(device);
1095
	if (result)
1096 1097
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
L
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1098 1099

	return 0;
1100 1101

 err:
1102
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
1103
	if (device->parent)
1104 1105
		list_del(&device->node);
	list_del(&device->wakeup_list);
1106
	mutex_unlock(&acpi_device_lock);
1107 1108

 err_detach:
1109
	acpi_detach_data(device->handle, acpi_scan_drop_device);
1110
	return result;
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1111 1112
}

Z
Zhang Rui 已提交
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
/* --------------------------------------------------------------------------
                                 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
1125
{
1126
	int ret;
L
Linus Torvalds 已提交
1127

Z
Zhang Rui 已提交
1128 1129
	if (acpi_disabled)
		return -ENODEV;
1130 1131 1132
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
1133

1134 1135
	ret = driver_register(&driver->drv);
	return ret;
Z
Zhang Rui 已提交
1136
}
L
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1137

Z
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1138 1139 1140
EXPORT_SYMBOL(acpi_bus_register_driver);

/**
1141
 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
Z
Zhang Rui 已提交
1142 1143 1144 1145 1146 1147 1148
 * @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)
{
1149
	driver_unregister(&driver->drv);
Z
Zhang Rui 已提交
1150 1151 1152 1153 1154 1155 1156
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
1157 1158
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
1159
	struct acpi_device *device = NULL;
1160 1161 1162 1163 1164 1165 1166
	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.
	 */
1167
	if (!handle)
1168 1169 1170 1171 1172
		return acpi_root;

	do {
		status = acpi_get_parent(handle, &handle);
		if (ACPI_FAILURE(status))
1173 1174 1175
			return status == AE_NULL_ENTRY ? NULL : acpi_root;
	} while (acpi_bus_get_device(handle, &device));
	return device;
1176 1177
}

Z
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1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
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;
1193 1194
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
1195 1196 1197 1198 1199 1200
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

1201 1202
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
1203
{
1204 1205
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
1206
	union acpi_object *element = NULL;
1207
	acpi_status status;
1208
	int err = -ENODATA;
Z
Zhang Rui 已提交
1209

1210
	if (!wakeup)
1211
		return -EINVAL;
Z
Zhang Rui 已提交
1212

1213
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
1214

1215 1216 1217 1218
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1219
		return err;
1220 1221 1222 1223
	}

	package = (union acpi_object *)buffer.pointer;

1224
	if (!package || package->package.count < 2)
1225 1226
		goto out;

Z
Zhang Rui 已提交
1227
	element = &(package->package.elements[0]);
1228
	if (!element)
1229
		goto out;
1230

Z
Zhang Rui 已提交
1231 1232 1233 1234
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
1235
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1236
			goto out;
1237

1238
		wakeup->gpe_device =
Z
Zhang Rui 已提交
1239
		    element->package.elements[0].reference.handle;
1240
		wakeup->gpe_number =
Z
Zhang Rui 已提交
1241 1242
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
1243 1244 1245 1246 1247
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
1248 1249

	element = &(package->package.elements[1]);
1250
	if (element->type != ACPI_TYPE_INTEGER)
1251
		goto out;
1252

1253
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
1254

1255 1256
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
1257
		goto out;
Z
Zhang Rui 已提交
1258

1259 1260
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1261

1262 1263 1264 1265 1266 1267 1268 1269
		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;
		}
1270 1271 1272 1273 1274 1275 1276
		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
1277
	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1278

1279 1280
 out:
	kfree(buffer.pointer);
1281
	return err;
L
Linus Torvalds 已提交
1282 1283
}

1284
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1285
{
1286 1287
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1288
		{"PNP0C0D", 0},
1289 1290 1291
		{"PNP0C0E", 0},
		{"", 0},
	};
1292 1293 1294
	acpi_status status;
	acpi_event_status event_status;

1295
	device->wakeup.flags.notifier_present = 0;
1296 1297 1298 1299

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
		device->wakeup.flags.run_wake = 1;
1300 1301 1302 1303 1304
		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;
		}
1305
		device_set_wakeup_capable(&device->dev, true);
1306 1307 1308
		return;
	}

1309 1310 1311
	status = acpi_get_gpe_status(device->wakeup.gpe_device,
					device->wakeup.gpe_number,
						&event_status);
1312 1313 1314 1315 1316
	if (status == AE_OK)
		device->wakeup.flags.run_wake =
				!!(event_status & ACPI_EVENT_FLAG_HANDLE);
}

1317
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1318
{
1319
	int err;
1320

1321
	/* Presence of _PRW indicates wake capable */
1322
	if (!acpi_has_method(device->handle, "_PRW"))
1323 1324
		return;

1325 1326 1327 1328
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1329
		return;
Z
Zhang Rui 已提交
1330
	}
L
Linus Torvalds 已提交
1331

Z
Zhang Rui 已提交
1332
	device->wakeup.flags.valid = 1;
1333
	device->wakeup.prepare_count = 0;
1334
	acpi_bus_set_run_wake_flags(device);
1335 1336 1337 1338 1339 1340
	/* 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.
	 */
1341 1342
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1343 1344
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1345 1346
}

1347 1348 1349
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1350 1351
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1352
	acpi_status status;
1353

1354 1355
	INIT_LIST_HEAD(&ps->resources);

1356 1357 1358 1359 1360 1361 1362 1363
	/* 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) {
1364 1365 1366
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1367
				device->power.flags.power_resources = 1;
1368
		}
1369
		ACPI_FREE(buffer.pointer);
1370 1371 1372
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1373
	pathname[2] = 'S';
1374
	if (acpi_has_method(device->handle, pathname))
1375 1376 1377 1378 1379 1380
		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.
	 */
1381
	if (!list_empty(&ps->resources)
1382 1383 1384 1385 1386 1387 1388 1389 1390
	    || (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 */
}

1391
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1392
{
1393
	u32 i;
B
Bjorn Helgaas 已提交
1394

1395
	/* Presence of _PS0|_PR0 indicates 'power manageable' */
1396 1397 1398
	if (!acpi_has_method(device->handle, "_PS0") &&
	    !acpi_has_method(device->handle, "_PR0"))
		return;
B
Bjorn Helgaas 已提交
1399

1400
	device->flags.power_manageable = 1;
L
Len Brown 已提交
1401

Z
Zhang Rui 已提交
1402 1403 1404
	/*
	 * Power Management Flags
	 */
1405
	if (acpi_has_method(device->handle, "_PSC"))
Z
Zhang Rui 已提交
1406
		device->power.flags.explicit_get = 1;
1407
	if (acpi_has_method(device->handle, "_IRC"))
Z
Zhang Rui 已提交
1408
		device->power.flags.inrush_current = 1;
L
Linus Torvalds 已提交
1409

Z
Zhang Rui 已提交
1410 1411 1412
	/*
	 * Enumerate supported power management states
	 */
1413 1414
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1415

1416
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1417

Z
Zhang Rui 已提交
1418 1419 1420
	/* 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;
1421 1422
	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
1423

1424 1425 1426 1427
	/* 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;

1428 1429 1430 1431 1432
	/* 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;

1433 1434 1435 1436
	if (acpi_bus_init_power(device)) {
		acpi_free_power_resources_lists(device);
		device->flags.power_manageable = 0;
	}
Z
Zhang Rui 已提交
1437
}
L
Len Brown 已提交
1438

1439
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1440 1441
{
	/* Presence of _STA indicates 'dynamic_status' */
1442
	if (acpi_has_method(device->handle, "_STA"))
L
Linus Torvalds 已提交
1443 1444 1445
		device->flags.dynamic_status = 1;

	/* Presence of _RMV indicates 'removable' */
1446
	if (acpi_has_method(device->handle, "_RMV"))
L
Linus Torvalds 已提交
1447 1448 1449
		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
1450 1451
	if (acpi_has_method(device->handle, "_EJD") ||
	    acpi_has_method(device->handle, "_EJ0"))
L
Linus Torvalds 已提交
1452 1453 1454
		device->flags.ejectable = 1;
}

1455
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1456
{
L
Len Brown 已提交
1457 1458 1459
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1460 1461 1462 1463 1464 1465 1466

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1467
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1468
		strcpy(device->pnp.bus_id, "ACPI");
1469 1470 1471 1472
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477 1478 1479
	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:
1480
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
		/* 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;
	}
}

1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
/*
 * 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");
}

1507
/*
1508
 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1509 1510 1511 1512
 *
 * 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
 */
1513
bool acpi_bay_match(acpi_handle handle)
1514
{
1515 1516
	acpi_handle phandle;

1517
	if (!acpi_has_method(handle, "_EJ0"))
1518 1519 1520 1521 1522
		return false;
	if (acpi_ata_match(handle))
		return true;
	if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
		return false;
1523

1524
	return acpi_ata_match(phandle);
1525 1526
}

1527
/*
1528
 * acpi_dock_match - see if an acpi object has a _DCK method
1529
 */
1530
bool acpi_dock_match(acpi_handle handle)
1531
{
1532
	return acpi_has_method(handle, "_DCK");
1533 1534
}

1535
const char *acpi_device_hid(struct acpi_device *device)
1536
{
1537
	struct acpi_hardware_id *hid;
1538

1539 1540 1541
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1542 1543 1544 1545
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1546

1547
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1548 1549
{
	struct acpi_hardware_id *id;
1550

1551 1552 1553
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1554

T
Thomas Meyer 已提交
1555
	id->id = kstrdup(dev_id, GFP_KERNEL);
1556 1557 1558
	if (!id->id) {
		kfree(id);
		return;
1559 1560
	}

1561 1562
	list_add_tail(&id->list, &pnp->ids);
	pnp->type.hardware_id = 1;
1563 1564
}

1565 1566 1567 1568 1569
/*
 * 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.
 */
1570
static bool acpi_ibm_smbus_match(acpi_handle handle)
1571
{
1572 1573
	char node_name[ACPI_PATH_SEGMENT_LENGTH];
	struct acpi_buffer path = { sizeof(node_name), node_name };
1574 1575

	if (!dmi_name_in_vendors("IBM"))
1576
		return false;
1577 1578

	/* Look for SMBS object */
1579 1580 1581
	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
	    strcmp("SMBS", path.pointer))
		return false;
1582 1583

	/* Does it have the necessary (but misnamed) methods? */
1584 1585 1586
	if (acpi_has_method(handle, "SBI") &&
	    acpi_has_method(handle, "SBR") &&
	    acpi_has_method(handle, "SBW"))
1587 1588 1589
		return true;

	return false;
1590 1591
}

1592 1593
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
				int device_type)
L
Linus Torvalds 已提交
1594
{
L
Len Brown 已提交
1595
	acpi_status status;
1596
	struct acpi_device_info *info;
1597
	struct acpi_pnp_device_id_list *cid_list;
1598
	int i;
L
Linus Torvalds 已提交
1599

1600
	switch (device_type) {
L
Linus Torvalds 已提交
1601
	case ACPI_BUS_TYPE_DEVICE:
1602 1603
		if (handle == ACPI_ROOT_OBJECT) {
			acpi_add_id(pnp, ACPI_SYSTEM_HID);
1604 1605 1606
			break;
		}

1607
		status = acpi_get_object_info(handle, &info);
L
Linus Torvalds 已提交
1608
		if (ACPI_FAILURE(status)) {
1609 1610
			pr_err(PREFIX "%s: Error reading device info\n",
					__func__);
L
Linus Torvalds 已提交
1611 1612 1613 1614
			return;
		}

		if (info->valid & ACPI_VALID_HID)
1615
			acpi_add_id(pnp, info->hardware_id.string);
1616
		if (info->valid & ACPI_VALID_CID) {
1617
			cid_list = &info->compatible_id_list;
1618
			for (i = 0; i < cid_list->count; i++)
1619
				acpi_add_id(pnp, cid_list->ids[i].string);
1620
		}
L
Linus Torvalds 已提交
1621
		if (info->valid & ACPI_VALID_ADR) {
1622 1623
			pnp->bus_address = info->address;
			pnp->type.bus_address = 1;
L
Linus Torvalds 已提交
1624
		}
1625
		if (info->valid & ACPI_VALID_UID)
1626
			pnp->unique_id = kstrdup(info->unique_id.string,
1627
							GFP_KERNEL);
1628

1629 1630
		kfree(info);

1631 1632 1633 1634
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1635 1636
		if (acpi_is_video_device(handle))
			acpi_add_id(pnp, ACPI_VIDEO_HID);
1637
		else if (acpi_bay_match(handle))
1638
			acpi_add_id(pnp, ACPI_BAY_HID);
1639
		else if (acpi_dock_match(handle))
1640
			acpi_add_id(pnp, ACPI_DOCK_HID);
1641
		else if (acpi_ibm_smbus_match(handle))
1642 1643 1644 1645 1646
			acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
		else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
			acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
			strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
			strcpy(pnp->device_class, ACPI_BUS_CLASS);
1647
		}
1648

L
Linus Torvalds 已提交
1649 1650
		break;
	case ACPI_BUS_TYPE_POWER:
1651
		acpi_add_id(pnp, ACPI_POWER_HID);
L
Linus Torvalds 已提交
1652 1653
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1654
		acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
L
Linus Torvalds 已提交
1655 1656
		break;
	case ACPI_BUS_TYPE_THERMAL:
1657
		acpi_add_id(pnp, ACPI_THERMAL_HID);
L
Linus Torvalds 已提交
1658 1659
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1660
		acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
L
Linus Torvalds 已提交
1661 1662
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1663
		acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
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1664 1665 1666 1667
		break;
	}
}

1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
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);
}

1679 1680
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
1681
{
1682 1683 1684 1685 1686 1687
	INIT_LIST_HEAD(&device->pnp.ids);
	device->device_type = type;
	device->handle = handle;
	device->parent = acpi_bus_get_parent(handle);
	STRUCT_TO_INT(device->status) = sta;
	acpi_device_get_busid(device);
1688
	acpi_set_pnp_ids(handle, &device->pnp, type);
1689
	acpi_bus_get_flags(device);
1690
	device->flags.match_driver = false;
1691 1692
	device->flags.initialized = true;
	device->flags.visited = false;
1693 1694 1695
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
1696

1697 1698 1699 1700
void acpi_device_add_finalize(struct acpi_device *device)
{
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
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1701 1702
}

1703 1704
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
1705
				  unsigned long long sta)
L
Linus Torvalds 已提交
1706
{
1707 1708
	int result;
	struct acpi_device *device;
1709
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
1710

1711
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
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1712
	if (!device) {
1713
		printk(KERN_ERR PREFIX "Memory allocation error\n");
1714
		return -ENOMEM;
L
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1715 1716
	}

1717 1718
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
1719
	acpi_bus_get_wakeup_device_flags(device);
L
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1720

1721
	result = acpi_device_add(device, acpi_device_release);
1722
	if (result) {
1723
		acpi_device_release(&device->dev);
1724 1725
		return result;
	}
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Linus Torvalds 已提交
1726

1727
	acpi_power_add_remove_device(device, true);
1728
	acpi_device_add_finalize(device);
1729 1730 1731 1732 1733 1734 1735
	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;
1736 1737
}

1738 1739
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
1740
{
1741 1742
	acpi_status status;
	acpi_object_type acpi_type;
L
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1743

1744
	status = acpi_get_type(handle, &acpi_type);
1745
	if (ACPI_FAILURE(status))
1746
		return -ENODEV;
L
Len Brown 已提交
1747

1748
	switch (acpi_type) {
1749 1750
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
1751 1752 1753 1754
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1755 1756
		break;
	case ACPI_TYPE_PROCESSOR:
1757 1758 1759 1760
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1761 1762
		break;
	case ACPI_TYPE_THERMAL:
1763 1764
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
1765 1766
		break;
	case ACPI_TYPE_POWER:
1767 1768
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
1769 1770
		break;
	default:
1771
		return -ENODEV;
1772
	}
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1773

1774 1775 1776
	return 0;
}

1777 1778 1779 1780 1781 1782 1783 1784 1785
bool acpi_device_is_present(struct acpi_device *adev)
{
	if (adev->status.present || adev->status.functional)
		return true;

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

1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802
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;
}

1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
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;
}

1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
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);
}

1827
static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1828
{
1829 1830
	struct acpi_device_pnp pnp = {};
	struct acpi_hardware_id *hwid;
1831 1832
	struct acpi_scan_handler *handler;

1833 1834
	INIT_LIST_HEAD(&pnp.ids);
	acpi_set_pnp_ids(handle, &pnp, type);
1835

1836
	if (!pnp.type.hardware_id)
1837
		goto out;
1838 1839 1840 1841 1842

	/*
	 * This relies on the fact that acpi_install_notify_handler() will not
	 * install the same notify handler routine twice for the same handle.
	 */
1843 1844
	list_for_each_entry(hwid, &pnp.ids, list) {
		handler = acpi_scan_match_handler(hwid->id, NULL);
1845
		if (handler) {
1846 1847
			acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					acpi_hotplug_notify_cb, handler);
1848 1849 1850 1851
			break;
		}
	}

1852
out:
1853
	acpi_free_pnp_ids(&pnp);
1854 1855
}

1856 1857
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
1858
{
1859
	struct acpi_device *device = NULL;
1860 1861 1862 1863
	int type;
	unsigned long long sta;
	int result;

1864 1865 1866 1867
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

1868 1869 1870 1871
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

1872 1873 1874 1875 1876
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

1877
	acpi_scan_init_hotplug(handle, type);
1878

1879
	acpi_add_single_object(&device, handle, type, sta);
1880
	if (!device)
1881
		return AE_CTRL_DEPTH;
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Linus Torvalds 已提交
1882

1883
 out:
1884 1885
	if (!*return_value)
		*return_value = device;
1886

1887 1888
	return AE_OK;
}
1889

1890
static int acpi_scan_attach_handler(struct acpi_device *device)
1891
{
1892 1893
	struct acpi_hardware_id *hwid;
	int ret = 0;
1894

1895
	list_for_each_entry(hwid, &device->pnp.ids, list) {
1896
		const struct acpi_device_id *devid;
1897
		struct acpi_scan_handler *handler;
1898

1899 1900
		handler = acpi_scan_match_handler(hwid->id, &devid);
		if (handler) {
1901 1902 1903
			ret = handler->attach(device, devid);
			if (ret > 0) {
				device->handler = handler;
1904
				break;
1905
			} else if (ret < 0) {
1906
				break;
1907
			}
1908 1909 1910 1911 1912
		}
	}
	return ret;
}

1913 1914
static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
1915
{
1916
	struct acpi_device *device;
1917
	unsigned long long sta;
1918
	int ret;
1919

1920 1921 1922 1923
	/*
	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
	 * namespace walks prematurely.
	 */
1924
	if (acpi_bus_type_and_status(handle, &ret, &sta))
1925
		return AE_OK;
L
Linus Torvalds 已提交
1926

1927 1928
	if (acpi_bus_get_device(handle, &device))
		return AE_CTRL_DEPTH;
1929

1930 1931 1932 1933 1934
	STRUCT_TO_INT(device->status) = sta;
	/* Skip devices that are not present. */
	if (!acpi_device_is_present(device))
		goto err;

1935 1936 1937
	if (device->handler)
		return AE_OK;

1938 1939 1940 1941
	if (!device->flags.initialized) {
		acpi_bus_update_power(device, NULL);
		device->flags.initialized = true;
	}
1942
	ret = acpi_scan_attach_handler(device);
1943
	if (ret < 0)
1944
		goto err;
1945 1946 1947

	device->flags.match_driver = true;
	if (ret > 0)
1948
		goto ok;
1949 1950

	ret = device_attach(&device->dev);
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
	if (ret < 0)
		goto err;

 ok:
	device->flags.visited = true;
	return AE_OK;

 err:
	device->flags.visited = false;
	return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
1961 1962
}

1963
/**
1964
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1965
 * @handle: Root of the namespace scope to scan.
1966
 *
1967 1968
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
1969
 *
1970 1971 1972 1973
 * 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.
1974 1975
 *
 * Must be called under acpi_scan_lock.
1976
 */
1977
int acpi_bus_scan(acpi_handle handle)
1978
{
1979
	void *device = NULL;
1980
	int error = 0;
1981

1982 1983 1984
	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);
1985

1986
	if (!device)
1987 1988
		error = -ENODEV;
	else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1989 1990
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_device_attach, NULL, NULL, NULL);
1991

1992
	return error;
1993
}
1994
EXPORT_SYMBOL(acpi_bus_scan);
1995

1996 1997 1998 1999
static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
{
	struct acpi_device *device = NULL;
2000

2001
	if (!acpi_bus_get_device(handle, &device)) {
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
		struct acpi_scan_handler *dev_handler = device->handler;

		if (dev_handler) {
			if (dev_handler->detach)
				dev_handler->detach(device);

			device->handler = NULL;
		} else {
			device_release_driver(&device->dev);
		}
2012 2013 2014 2015 2016 2017 2018
		/*
		 * Most likely, the device is going away, so put it into D3cold
		 * before that.
		 */
		acpi_device_set_power(device, ACPI_STATE_D3_COLD);
		device->flags.initialized = false;
		device->flags.visited = false;
2019 2020
	}
	return AE_OK;
2021
}
L
Linus Torvalds 已提交
2022

2023 2024 2025 2026 2027 2028
/**
 * acpi_bus_trim - Remove ACPI device node and all of its descendants
 * @start: Root of the ACPI device nodes subtree to remove.
 *
 * Must be called under acpi_scan_lock.
 */
2029
void acpi_bus_trim(struct acpi_device *start)
L
Linus Torvalds 已提交
2030
{
2031 2032 2033 2034 2035 2036 2037
	/*
	 * Execute acpi_bus_device_detach() as a post-order callback to detach
	 * all ACPI drivers from the device nodes being removed.
	 */
	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
			    acpi_bus_device_detach, NULL, NULL);
	acpi_bus_device_detach(start->handle, 0, NULL, NULL);
L
Linus Torvalds 已提交
2038
}
2039 2040
EXPORT_SYMBOL_GPL(acpi_bus_trim);

2041
static int acpi_bus_scan_fixed(void)
L
Linus Torvalds 已提交
2042
{
L
Len Brown 已提交
2043
	int result = 0;
L
Li Shaohua 已提交
2044

L
Linus Torvalds 已提交
2045 2046 2047
	/*
	 * Enumerate all fixed-feature devices.
	 */
2048 2049 2050
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

2051
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2052
						ACPI_BUS_TYPE_POWER_BUTTON,
2053 2054 2055 2056
						ACPI_STA_DEFAULT);
		if (result)
			return result;

2057
		device->flags.match_driver = true;
2058 2059 2060 2061
		result = device_attach(&device->dev);
		if (result < 0)
			return result;

2062
		device_init_wakeup(&device->dev, true);
2063
	}
L
Linus Torvalds 已提交
2064

2065 2066 2067
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

2068
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2069
						ACPI_BUS_TYPE_SLEEP_BUTTON,
2070 2071 2072 2073
						ACPI_STA_DEFAULT);
		if (result)
			return result;

2074
		device->flags.match_driver = true;
2075
		result = device_attach(&device->dev);
2076
	}
L
Linus Torvalds 已提交
2077

2078
	return result < 0 ? result : 0;
L
Linus Torvalds 已提交
2079 2080
}

2081
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
2082 2083 2084
{
	int result;

2085 2086 2087 2088 2089 2090
	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");
	}

2091
	acpi_pci_root_init();
2092
	acpi_pci_link_init();
2093
	acpi_processor_init();
2094
	acpi_platform_init();
2095
	acpi_lpss_init();
2096
	acpi_cmos_rtc_init();
2097
	acpi_container_init();
2098
	acpi_memory_hotplug_init();
2099
	acpi_dock_init();
2100

2101
	mutex_lock(&acpi_scan_lock);
L
Linus Torvalds 已提交
2102 2103 2104
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
2105 2106
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
2107
		goto out;
L
Linus Torvalds 已提交
2108

2109
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
2110
	if (result)
2111
		goto out;
L
Linus Torvalds 已提交
2112

2113 2114
	result = acpi_bus_scan_fixed();
	if (result) {
2115 2116 2117
		acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
		acpi_device_del(acpi_root);
		put_device(&acpi_root->dev);
2118
		goto out;
2119
	}
L
Linus Torvalds 已提交
2120

2121
	acpi_update_all_gpes();
2122 2123 2124 2125

 out:
	mutex_unlock(&acpi_scan_lock);
	return result;
L
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2126
}