scan.c 53.5 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 "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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/*
 * 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_companions(acpi_handle handle, u32 lvl,
					       void *data, void **ret_p)
{
	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;

	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;
}

static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl,
					      void *data, void **ret_p)
{
	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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	/* If there is no handle, the device node has been unregistered. */
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	if (!handle) {
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		dev_dbg(&device->dev, "ACPI handle missing\n");
		put_device(&device->dev);
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		return -EINVAL;
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	}

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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;
	acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
			    NULL, acpi_bus_offline_companions,
			    (void *)false, (void **)&errdev);
	acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev);
	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_companions,
				    (void *)true , (void **)&errdev);
		if (!errdev || acpi_force_hot_remove)
			acpi_bus_offline_companions(handle, 0, (void *)true,
						    (void **)&errdev);

		if (errdev && !acpi_force_hot_remove) {
			dev_warn(errdev, "Offline failed.\n");
			acpi_bus_online_companions(handle, 0, NULL, NULL);
			acpi_walk_namespace(ACPI_TYPE_ANY, handle,
					    ACPI_UINT32_MAX,
					    acpi_bus_online_companions, NULL,
					    NULL, NULL);
			put_device(&device->dev);
			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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	/* Device node has been unregistered. */
	put_device(&device->dev);
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	device = NULL;

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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 void acpi_bus_device_eject(void *context)
{
	acpi_handle handle = context;
	struct acpi_device *device = NULL;
	struct acpi_scan_handler *handler;
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
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	int error;
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	lock_device_hotplug();
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	mutex_lock(&acpi_scan_lock);

	acpi_bus_get_device(handle, &device);
	if (!device)
		goto err_out;

	handler = device->handler;
	if (!handler || !handler->hotplug.enabled) {
		ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
		goto err_out;
	}
	acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
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	if (handler->hotplug.mode == AHM_CONTAINER)
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		kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);

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	get_device(&device->dev);
	error = acpi_scan_hot_remove(device);
	if (error)
		goto err_out;
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	mutex_unlock(&acpi_scan_lock);
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	unlock_device_hotplug();
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	return;
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 err_out:
	acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
				  NULL);
	goto out;
}

static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
{
	struct acpi_device *device = NULL;
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
	int error;

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	lock_device_hotplug();
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	mutex_lock(&acpi_scan_lock);
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	if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
		acpi_bus_get_device(handle, &device);
		if (device) {
			dev_warn(&device->dev, "Attempt to re-insert\n");
			goto out;
		}
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	}
	acpi_evaluate_hotplug_ost(handle, ost_source,
				  ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
	error = acpi_bus_scan(handle);
	if (error) {
		acpi_handle_warn(handle, "Namespace scan failure\n");
		goto out;
	}
	error = acpi_bus_get_device(handle, &device);
	if (error) {
		acpi_handle_warn(handle, "Missing device node object\n");
		goto out;
	}
	ost_code = ACPI_OST_SC_SUCCESS;
	if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
		kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);

 out:
	acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
	mutex_unlock(&acpi_scan_lock);
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	unlock_device_hotplug();
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}

static void acpi_scan_bus_check(void *context)
{
	acpi_scan_bus_device_check((acpi_handle)context,
				   ACPI_NOTIFY_BUS_CHECK);
}

static void acpi_scan_device_check(void *context)
{
	acpi_scan_bus_device_check((acpi_handle)context,
				   ACPI_NOTIFY_DEVICE_CHECK);
}

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static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
{
	u32 ost_status;

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		acpi_handle_debug(handle,
			"ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
		ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
		break;
	case ACPI_NOTIFY_DEVICE_CHECK:
		acpi_handle_debug(handle,
			"ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
		ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
		break;
	case ACPI_NOTIFY_EJECT_REQUEST:
		acpi_handle_debug(handle,
			"ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
		ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
		break;
	default:
		/* non-hotplug event; possibly handled by other handler */
		return;
	}

	acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
}

static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
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{
	acpi_osd_exec_callback callback;
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	struct acpi_scan_handler *handler = data;
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	acpi_status status;

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	if (!handler->hotplug.enabled)
		return acpi_hotplug_unsupported(handle, type);

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	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
		callback = acpi_scan_bus_check;
		break;
	case ACPI_NOTIFY_DEVICE_CHECK:
		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
		callback = acpi_scan_device_check;
		break;
	case ACPI_NOTIFY_EJECT_REQUEST:
		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
		callback = acpi_bus_device_eject;
		break;
	default:
		/* non-hotplug event; possibly handled by other handler */
		return;
	}
	status = acpi_os_hotplug_execute(callback, handle);
	if (ACPI_FAILURE(status))
		acpi_evaluate_hotplug_ost(handle, type,
					  ACPI_OST_SC_NON_SPECIFIC_FAILURE,
					  NULL);
}

/**
 * acpi_bus_hot_remove_device: hot-remove a device and its children
 * @context: struct acpi_eject_event pointer (freed in this func)
 *
 * Hot-remove a device and its children. This function frees up the
 * memory space passed by arg context, so that the caller may call
 * this function asynchronously through acpi_os_hotplug_execute().
 */
void acpi_bus_hot_remove_device(void *context)
{
	struct acpi_eject_event *ej_event = context;
	struct acpi_device *device = ej_event->device;
	acpi_handle handle = device->handle;
	int error;

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	lock_device_hotplug();
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	mutex_lock(&acpi_scan_lock);

	error = acpi_scan_hot_remove(device);
	if (error && handle)
		acpi_evaluate_hotplug_ost(handle, ej_event->event,
					  ACPI_OST_SC_NON_SPECIFIC_FAILURE,
					  NULL);

	mutex_unlock(&acpi_scan_lock);
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	unlock_device_hotplug();
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	kfree(context);
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}
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EXPORT_SYMBOL(acpi_bus_hot_remove_device);
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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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	struct acpi_eject_event *ej_event;
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	acpi_object_type not_used;
	acpi_status status;
	int ret;
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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;

	ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
	if (!ej_event) {
		ret = -ENOMEM;
		goto err_out;
	}
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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);
	ej_event->device = acpi_device;
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	ej_event->event = ACPI_OST_EC_OSPM_EJECT;
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	get_device(&acpi_device->dev);
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	status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
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	if (ACPI_SUCCESS(status))
		return count;
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	put_device(&acpi_device->dev);
	kfree(ej_event);
	ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
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 err_out:
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	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 ret;
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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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{
613
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
P
Patrick Mochel 已提交
614
	acpi_status status;
Y
Yasuaki Ishimatsu 已提交
615
	unsigned long long sun;
616
	int result = 0;
L
Linus Torvalds 已提交
617 618

	/*
619
	 * Devices gotten from FADT don't have a "path" attribute
L
Linus Torvalds 已提交
620
	 */
621
	if (dev->handle) {
622
		result = device_create_file(&dev->dev, &dev_attr_path);
623
		if (result)
624
			goto end;
L
Linus Torvalds 已提交
625 626
	}

627 628 629 630
	if (!list_empty(&dev->pnp.ids)) {
		result = device_create_file(&dev->dev, &dev_attr_hid);
		if (result)
			goto end;
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Linus Torvalds 已提交
631

632 633 634 635
		result = device_create_file(&dev->dev, &dev_attr_modalias);
		if (result)
			goto end;
	}
636

637 638 639
	/*
	 * If device has _STR, 'description' file is created
	 */
640
	if (acpi_has_method(dev->handle, "_STR")) {
641 642 643 644 645 646 647 648 649 650
		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;
	}

651
	if (dev->pnp.type.bus_address)
652 653 654 655
		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
656 657 658 659 660 661 662 663 664 665
	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;
	}

666 667 668 669
        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
670
	if (acpi_has_method(dev->handle, "_EJ0")) {
671
		result = device_create_file(&dev->dev, &dev_attr_eject);
672 673 674 675 676 677 678 679 680 681 682 683 684 685
		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);
	}

686
end:
687
	return result;
L
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688 689
}

P
Patrick Mochel 已提交
690
static void acpi_device_remove_files(struct acpi_device *dev)
L
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691
{
692 693 694 695 696 697 698
	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
699
	/*
700 701
	 * If device has _STR, remove 'description' file
	 */
702
	if (acpi_has_method(dev->handle, "_STR")) {
703 704 705 706 707
		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
708
	 */
709
	if (acpi_has_method(dev->handle, "_EJ0"))
P
Patrick Mochel 已提交
710
		device_remove_file(&dev->dev, &dev_attr_eject);
L
Linus Torvalds 已提交
711

712
	if (acpi_has_method(dev->handle, "_SUN"))
Y
Yasuaki Ishimatsu 已提交
713 714
		device_remove_file(&dev->dev, &dev_attr_sun);

715 716
	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
717
	if (dev->pnp.type.bus_address)
718
		device_remove_file(&dev->dev, &dev_attr_adr);
719 720
	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
721
	if (dev->handle)
722
		device_remove_file(&dev->dev, &dev_attr_path);
L
Linus Torvalds 已提交
723 724
}
/* --------------------------------------------------------------------------
Z
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725
			ACPI Bus operations
L
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726
   -------------------------------------------------------------------------- */
727

728 729
static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
730 731
{
	const struct acpi_device_id *id;
732
	struct acpi_hardware_id *hwid;
733

734 735 736 737 738
	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
739
		return NULL;
740

741 742 743
	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
				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;
764
	acpi_handle handle = ACPI_HANDLE(dev);
765

766
	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
767 768 769 770 771
		return NULL;

	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
772

773 774 775 776
int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
777 778 779
}
EXPORT_SYMBOL(acpi_match_device_ids);

780 781 782 783
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

784 785 786
	if (device->wakeup.flags.valid)
		acpi_power_resources_list_free(&device->wakeup.resources);

787 788 789 790 791 792 793
	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);
	}
794 795
}

796
static void acpi_device_release(struct device *dev)
L
Linus Torvalds 已提交
797
{
798
	struct acpi_device *acpi_dev = to_acpi_device(dev);
L
Linus Torvalds 已提交
799

800
	acpi_free_pnp_ids(&acpi_dev->pnp);
801
	acpi_free_power_resources_lists(acpi_dev);
802
	kfree(acpi_dev);
L
Linus Torvalds 已提交
803 804
}

805
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
Z
Zhang Rui 已提交
806
{
807 808
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
L
Linus Torvalds 已提交
809

810
	return acpi_dev->flags.match_driver
811
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
812
}
L
Linus Torvalds 已提交
813

814
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
L
Linus Torvalds 已提交
815
{
816
	struct acpi_device *acpi_dev = to_acpi_device(dev);
817
	int len;
818

819 820 821
	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

822 823 824 825 826 827 828
	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
829
	return 0;
L
Linus Torvalds 已提交
830 831
}

832 833 834 835 836 837 838 839 840 841 842
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;

843 844
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
845 846 847 848 849 850 851
	return AE_OK;
}

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

852
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
853 854 855 856
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
857
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
		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)
{
875
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
876 877
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
878
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
879 880 881 882 883 884 885
		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);
}

886
static int acpi_device_probe(struct device *dev)
L
Linus Torvalds 已提交
887
{
888 889 890 891
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

892 893 894
	if (acpi_dev->handler)
		return -EINVAL;

895 896
	if (!acpi_drv->ops.add)
		return -ENOSYS;
897

898 899 900
	ret = acpi_drv->ops.add(acpi_dev);
	if (ret)
		return ret;
901

902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
	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;
		}
917
	}
918 919 920 921 922

	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;
923
}
L
Linus Torvalds 已提交
924

925 926 927 928 929 930
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) {
931 932
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
933
		if (acpi_drv->ops.remove)
934
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
935
	}
936
	acpi_dev->driver = NULL;
937
	acpi_dev->driver_data = NULL;
L
Linus Torvalds 已提交
938

939
	put_device(dev);
Z
Zhang Rui 已提交
940 941
	return 0;
}
L
Linus Torvalds 已提交
942

943
struct bus_type acpi_bus_type = {
Z
Zhang Rui 已提交
944
	.name		= "acpi",
945 946 947 948
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
Zhang Rui 已提交
949 950
};

951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
static void acpi_bus_data_handler(acpi_handle handle, void *context)
{
	/* Intentionally empty. */
}

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

	if (!device)
		return -EINVAL;

	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
	if (ACPI_FAILURE(status) || !*device) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
				  handle));
		return -ENODEV;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_device);

973 974
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
L
Linus Torvalds 已提交
975
{
L
Len Brown 已提交
976
	int result;
977 978
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
979

980 981 982 983 984 985 986 987 988 989 990 991
	if (device->handle) {
		acpi_status status;

		status = acpi_attach_data(device->handle, acpi_bus_data_handler,
					  device);
		if (ACPI_FAILURE(status)) {
			acpi_handle_err(device->handle,
					"Unable to attach device data\n");
			return -ENODEV;
		}
	}

Z
Zhang Rui 已提交
992 993 994 995 996 997 998 999
	/*
	 * 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);
1000 1001
	INIT_LIST_HEAD(&device->physical_node_list);
	mutex_init(&device->physical_node_lock);
1002
	INIT_LIST_HEAD(&device->power_dependent);
L
Linus Torvalds 已提交
1003

1004 1005
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
1006 1007 1008
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
L
Linus Torvalds 已提交
1009
	}
1010

1011
	mutex_lock(&acpi_device_lock);
1012 1013 1014 1015 1016
	/*
	 * 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) {
1017 1018 1019
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
1020 1021 1022 1023
			found = 1;
			kfree(new_bus_id);
			break;
		}
L
Linus Torvalds 已提交
1024
	}
1025
	if (!found) {
1026
		acpi_device_bus_id = new_bus_id;
1027
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1028 1029
		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
1030
	}
1031
	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
1032

L
Len Brown 已提交
1033
	if (device->parent)
Z
Zhang Rui 已提交
1034
		list_add_tail(&device->node, &device->parent->children);
L
Len Brown 已提交
1035

Z
Zhang Rui 已提交
1036 1037
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1038
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
1039

1040
	if (device->parent)
1041
		device->dev.parent = &device->parent->dev;
1042
	device->dev.bus = &acpi_bus_type;
1043
	device->dev.release = release;
1044
	result = device_add(&device->dev);
1045
	if (result) {
1046
		dev_err(&device->dev, "Error registering device\n");
1047
		goto err;
L
Linus Torvalds 已提交
1048 1049
	}

1050
	result = acpi_device_setup_files(device);
1051
	if (result)
1052 1053
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
L
Linus Torvalds 已提交
1054 1055

	return 0;
1056 1057

 err:
1058
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
1059
	if (device->parent)
1060 1061
		list_del(&device->node);
	list_del(&device->wakeup_list);
1062
	mutex_unlock(&acpi_device_lock);
1063 1064 1065

 err_detach:
	acpi_detach_data(device->handle, acpi_bus_data_handler);
1066
	return result;
L
Linus Torvalds 已提交
1067 1068
}

1069
static void acpi_device_unregister(struct acpi_device *device)
Z
Zhang Rui 已提交
1070
{
1071
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
1072
	if (device->parent)
Z
Zhang Rui 已提交
1073
		list_del(&device->node);
L
Linus Torvalds 已提交
1074

Z
Zhang Rui 已提交
1075
	list_del(&device->wakeup_list);
1076
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
1077

Z
Zhang Rui 已提交
1078
	acpi_detach_data(device->handle, acpi_bus_data_handler);
1079

1080
	acpi_power_add_remove_device(device, false);
P
Patrick Mochel 已提交
1081
	acpi_device_remove_files(device);
1082 1083 1084
	if (device->remove)
		device->remove(device);

1085
	device_del(&device->dev);
1086
	/*
1087 1088 1089
	 * Transition the device to D3cold to drop the reference counts of all
	 * power resources the device depends on and turn off the ones that have
	 * no more references.
1090
	 */
1091
	acpi_device_set_power(device, ACPI_STATE_D3_COLD);
1092
	device->handle = NULL;
1093
	put_device(&device->dev);
L
Linus Torvalds 已提交
1094 1095
}

Z
Zhang Rui 已提交
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
/* --------------------------------------------------------------------------
                                 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
1108
{
1109
	int ret;
L
Linus Torvalds 已提交
1110

Z
Zhang Rui 已提交
1111 1112
	if (acpi_disabled)
		return -ENODEV;
1113 1114 1115
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
1116

1117 1118
	ret = driver_register(&driver->drv);
	return ret;
Z
Zhang Rui 已提交
1119
}
L
Linus Torvalds 已提交
1120

Z
Zhang Rui 已提交
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
EXPORT_SYMBOL(acpi_bus_register_driver);

/**
 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 * @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)
{
1132
	driver_unregister(&driver->drv);
Z
Zhang Rui 已提交
1133 1134 1135 1136 1137 1138 1139
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
1140 1141
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
1142
	struct acpi_device *device = NULL;
1143 1144 1145 1146 1147 1148 1149
	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.
	 */
1150
	if (!handle)
1151 1152 1153 1154 1155
		return acpi_root;

	do {
		status = acpi_get_parent(handle, &handle);
		if (ACPI_FAILURE(status))
1156 1157 1158
			return status == AE_NULL_ENTRY ? NULL : acpi_root;
	} while (acpi_bus_get_device(handle, &device));
	return device;
1159 1160
}

Z
Zhang Rui 已提交
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
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;
1176 1177
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
1178 1179 1180 1181 1182 1183
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

1184 1185
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
1186
{
1187 1188
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
1189
	union acpi_object *element = NULL;
1190
	acpi_status status;
1191
	int err = -ENODATA;
Z
Zhang Rui 已提交
1192

1193
	if (!wakeup)
1194
		return -EINVAL;
Z
Zhang Rui 已提交
1195

1196
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
1197

1198 1199 1200 1201
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1202
		return err;
1203 1204 1205 1206
	}

	package = (union acpi_object *)buffer.pointer;

1207
	if (!package || package->package.count < 2)
1208 1209
		goto out;

Z
Zhang Rui 已提交
1210
	element = &(package->package.elements[0]);
1211
	if (!element)
1212
		goto out;
1213

Z
Zhang Rui 已提交
1214 1215 1216 1217
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
1218
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1219
			goto out;
1220

1221
		wakeup->gpe_device =
Z
Zhang Rui 已提交
1222
		    element->package.elements[0].reference.handle;
1223
		wakeup->gpe_number =
Z
Zhang Rui 已提交
1224 1225
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
1226 1227 1228 1229 1230
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
1231 1232

	element = &(package->package.elements[1]);
1233
	if (element->type != ACPI_TYPE_INTEGER)
1234
		goto out;
1235

1236
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
1237

1238 1239
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
1240
		goto out;
Z
Zhang Rui 已提交
1241

1242 1243
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1244

1245 1246 1247 1248 1249 1250 1251 1252
		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;
		}
1253 1254 1255 1256 1257 1258 1259
		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
1260
	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1261

1262 1263
 out:
	kfree(buffer.pointer);
1264
	return err;
L
Linus Torvalds 已提交
1265 1266
}

1267
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1268
{
1269 1270
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1271
		{"PNP0C0D", 0},
1272 1273 1274
		{"PNP0C0E", 0},
		{"", 0},
	};
1275 1276 1277
	acpi_status status;
	acpi_event_status event_status;

1278
	device->wakeup.flags.notifier_present = 0;
1279 1280 1281 1282

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
		device->wakeup.flags.run_wake = 1;
1283 1284 1285 1286 1287
		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;
		}
1288
		device_set_wakeup_capable(&device->dev, true);
1289 1290 1291
		return;
	}

1292 1293 1294
	status = acpi_get_gpe_status(device->wakeup.gpe_device,
					device->wakeup.gpe_number,
						&event_status);
1295 1296 1297 1298 1299
	if (status == AE_OK)
		device->wakeup.flags.run_wake =
				!!(event_status & ACPI_EVENT_FLAG_HANDLE);
}

1300
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1301
{
1302
	int err;
1303

1304
	/* Presence of _PRW indicates wake capable */
1305
	if (!acpi_has_method(device->handle, "_PRW"))
1306 1307
		return;

1308 1309 1310 1311
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1312
		return;
Z
Zhang Rui 已提交
1313
	}
L
Linus Torvalds 已提交
1314

Z
Zhang Rui 已提交
1315
	device->wakeup.flags.valid = 1;
1316
	device->wakeup.prepare_count = 0;
1317
	acpi_bus_set_run_wake_flags(device);
1318 1319 1320 1321 1322 1323
	/* 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.
	 */
1324 1325
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1326 1327
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1328 1329
}

1330 1331 1332
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1333 1334
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1335
	acpi_status status;
1336

1337 1338
	INIT_LIST_HEAD(&ps->resources);

1339 1340 1341 1342 1343 1344 1345 1346
	/* 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) {
1347 1348 1349
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1350
				device->power.flags.power_resources = 1;
1351
		}
1352
		ACPI_FREE(buffer.pointer);
1353 1354 1355
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1356
	pathname[2] = 'S';
1357
	if (acpi_has_method(device->handle, pathname))
1358 1359 1360 1361 1362 1363
		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.
	 */
1364
	if (!list_empty(&ps->resources)
1365 1366 1367 1368 1369 1370 1371 1372 1373
	    || (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 */
}

1374
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1375
{
1376
	u32 i;
B
Bjorn Helgaas 已提交
1377

1378
	/* Presence of _PS0|_PR0 indicates 'power manageable' */
1379 1380 1381
	if (!acpi_has_method(device->handle, "_PS0") &&
	    !acpi_has_method(device->handle, "_PR0"))
		return;
B
Bjorn Helgaas 已提交
1382

1383
	device->flags.power_manageable = 1;
L
Len Brown 已提交
1384

Z
Zhang Rui 已提交
1385 1386 1387
	/*
	 * Power Management Flags
	 */
1388
	if (acpi_has_method(device->handle, "_PSC"))
Z
Zhang Rui 已提交
1389
		device->power.flags.explicit_get = 1;
1390
	if (acpi_has_method(device->handle, "_IRC"))
Z
Zhang Rui 已提交
1391
		device->power.flags.inrush_current = 1;
L
Linus Torvalds 已提交
1392

Z
Zhang Rui 已提交
1393 1394 1395
	/*
	 * Enumerate supported power management states
	 */
1396 1397
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1398

1399
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1400

Z
Zhang Rui 已提交
1401 1402 1403
	/* 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;
1404 1405
	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
1406

1407 1408 1409 1410
	/* 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;

1411 1412 1413 1414 1415
	/* 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;

1416 1417 1418 1419
	if (acpi_bus_init_power(device)) {
		acpi_free_power_resources_lists(device);
		device->flags.power_manageable = 0;
	}
Z
Zhang Rui 已提交
1420
}
L
Len Brown 已提交
1421

1422
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1423 1424
{
	/* Presence of _STA indicates 'dynamic_status' */
1425
	if (acpi_has_method(device->handle, "_STA"))
L
Linus Torvalds 已提交
1426 1427 1428
		device->flags.dynamic_status = 1;

	/* Presence of _RMV indicates 'removable' */
1429
	if (acpi_has_method(device->handle, "_RMV"))
L
Linus Torvalds 已提交
1430 1431 1432
		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
1433 1434
	if (acpi_has_method(device->handle, "_EJD") ||
	    acpi_has_method(device->handle, "_EJ0"))
L
Linus Torvalds 已提交
1435 1436 1437
		device->flags.ejectable = 1;
}

1438
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1439
{
L
Len Brown 已提交
1440 1441 1442
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1443 1444 1445 1446 1447 1448 1449

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1450
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1451
		strcpy(device->pnp.bus_id, "ACPI");
1452 1453 1454 1455
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1456 1457 1458 1459 1460 1461 1462
	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:
1463
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
		/* 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;
	}
}

1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
/*
 * 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");
}

1490
/*
1491
 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1492 1493 1494 1495
 *
 * 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
 */
1496
bool acpi_bay_match(acpi_handle handle)
1497
{
1498 1499
	acpi_handle phandle;

1500
	if (!acpi_has_method(handle, "_EJ0"))
1501 1502 1503 1504 1505
		return false;
	if (acpi_ata_match(handle))
		return true;
	if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
		return false;
1506

1507
	return acpi_ata_match(phandle);
1508 1509
}

1510
/*
1511
 * acpi_dock_match - see if an acpi object has a _DCK method
1512
 */
1513
bool acpi_dock_match(acpi_handle handle)
1514
{
1515
	return acpi_has_method(handle, "_DCK");
1516 1517
}

1518
const char *acpi_device_hid(struct acpi_device *device)
1519
{
1520
	struct acpi_hardware_id *hid;
1521

1522 1523 1524
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1525 1526 1527 1528
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1529

1530
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1531 1532
{
	struct acpi_hardware_id *id;
1533

1534 1535 1536
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1537

T
Thomas Meyer 已提交
1538
	id->id = kstrdup(dev_id, GFP_KERNEL);
1539 1540 1541
	if (!id->id) {
		kfree(id);
		return;
1542 1543
	}

1544 1545
	list_add_tail(&id->list, &pnp->ids);
	pnp->type.hardware_id = 1;
1546 1547
}

1548 1549 1550 1551 1552
/*
 * 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.
 */
1553
static bool acpi_ibm_smbus_match(acpi_handle handle)
1554
{
1555 1556
	char node_name[ACPI_PATH_SEGMENT_LENGTH];
	struct acpi_buffer path = { sizeof(node_name), node_name };
1557 1558

	if (!dmi_name_in_vendors("IBM"))
1559
		return false;
1560 1561

	/* Look for SMBS object */
1562 1563 1564
	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
	    strcmp("SMBS", path.pointer))
		return false;
1565 1566

	/* Does it have the necessary (but misnamed) methods? */
1567 1568 1569
	if (acpi_has_method(handle, "SBI") &&
	    acpi_has_method(handle, "SBR") &&
	    acpi_has_method(handle, "SBW"))
1570 1571 1572
		return true;

	return false;
1573 1574
}

1575 1576
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
				int device_type)
L
Linus Torvalds 已提交
1577
{
L
Len Brown 已提交
1578
	acpi_status status;
1579
	struct acpi_device_info *info;
1580
	struct acpi_pnp_device_id_list *cid_list;
1581
	int i;
L
Linus Torvalds 已提交
1582

1583
	switch (device_type) {
L
Linus Torvalds 已提交
1584
	case ACPI_BUS_TYPE_DEVICE:
1585 1586
		if (handle == ACPI_ROOT_OBJECT) {
			acpi_add_id(pnp, ACPI_SYSTEM_HID);
1587 1588 1589
			break;
		}

1590
		status = acpi_get_object_info(handle, &info);
L
Linus Torvalds 已提交
1591
		if (ACPI_FAILURE(status)) {
1592 1593
			pr_err(PREFIX "%s: Error reading device info\n",
					__func__);
L
Linus Torvalds 已提交
1594 1595 1596 1597
			return;
		}

		if (info->valid & ACPI_VALID_HID)
1598
			acpi_add_id(pnp, info->hardware_id.string);
1599
		if (info->valid & ACPI_VALID_CID) {
1600
			cid_list = &info->compatible_id_list;
1601
			for (i = 0; i < cid_list->count; i++)
1602
				acpi_add_id(pnp, cid_list->ids[i].string);
1603
		}
L
Linus Torvalds 已提交
1604
		if (info->valid & ACPI_VALID_ADR) {
1605 1606
			pnp->bus_address = info->address;
			pnp->type.bus_address = 1;
L
Linus Torvalds 已提交
1607
		}
1608
		if (info->valid & ACPI_VALID_UID)
1609
			pnp->unique_id = kstrdup(info->unique_id.string,
1610
							GFP_KERNEL);
1611

1612 1613
		kfree(info);

1614 1615 1616 1617
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1618 1619
		if (acpi_is_video_device(handle))
			acpi_add_id(pnp, ACPI_VIDEO_HID);
1620
		else if (acpi_bay_match(handle))
1621
			acpi_add_id(pnp, ACPI_BAY_HID);
1622
		else if (acpi_dock_match(handle))
1623
			acpi_add_id(pnp, ACPI_DOCK_HID);
1624
		else if (acpi_ibm_smbus_match(handle))
1625 1626 1627 1628 1629
			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);
1630
		}
1631

L
Linus Torvalds 已提交
1632 1633
		break;
	case ACPI_BUS_TYPE_POWER:
1634
		acpi_add_id(pnp, ACPI_POWER_HID);
L
Linus Torvalds 已提交
1635 1636
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1637
		acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
L
Linus Torvalds 已提交
1638 1639
		break;
	case ACPI_BUS_TYPE_THERMAL:
1640
		acpi_add_id(pnp, ACPI_THERMAL_HID);
L
Linus Torvalds 已提交
1641 1642
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1643
		acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
L
Linus Torvalds 已提交
1644 1645
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1646
		acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
L
Linus Torvalds 已提交
1647 1648 1649 1650
		break;
	}
}

1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
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);
}

1662 1663
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
1664
{
1665 1666 1667 1668 1669 1670
	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);
1671
	acpi_set_pnp_ids(handle, &device->pnp, type);
1672
	acpi_bus_get_flags(device);
1673
	device->flags.match_driver = false;
1674 1675 1676
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
1677

1678 1679
void acpi_device_add_finalize(struct acpi_device *device)
{
1680
	device->flags.match_driver = true;
1681 1682
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
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1683 1684
}

1685 1686
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
1687
				  unsigned long long sta)
L
Linus Torvalds 已提交
1688
{
1689 1690
	int result;
	struct acpi_device *device;
1691
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
1692

1693
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
Linus Torvalds 已提交
1694
	if (!device) {
1695
		printk(KERN_ERR PREFIX "Memory allocation error\n");
1696
		return -ENOMEM;
L
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1697 1698
	}

1699 1700
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
1701
	acpi_bus_get_wakeup_device_flags(device);
L
Linus Torvalds 已提交
1702

1703
	result = acpi_device_add(device, acpi_device_release);
1704
	if (result) {
1705
		acpi_device_release(&device->dev);
1706 1707
		return result;
	}
L
Linus Torvalds 已提交
1708

1709
	acpi_power_add_remove_device(device, true);
1710
	acpi_device_add_finalize(device);
1711 1712 1713 1714 1715 1716 1717
	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;
1718 1719
}

1720 1721
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
1722
{
1723 1724
	acpi_status status;
	acpi_object_type acpi_type;
L
Linus Torvalds 已提交
1725

1726
	status = acpi_get_type(handle, &acpi_type);
1727
	if (ACPI_FAILURE(status))
1728
		return -ENODEV;
L
Len Brown 已提交
1729

1730
	switch (acpi_type) {
1731 1732
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
1733 1734 1735 1736
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1737 1738
		break;
	case ACPI_TYPE_PROCESSOR:
1739 1740 1741 1742
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1743 1744
		break;
	case ACPI_TYPE_THERMAL:
1745 1746
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
1747 1748
		break;
	case ACPI_TYPE_POWER:
1749 1750
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
1751 1752
		break;
	default:
1753
		return -ENODEV;
1754
	}
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Linus Torvalds 已提交
1755

1756 1757 1758
	return 0;
}

1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
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;
}

1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
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;
}

1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
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);
}

1800
static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1801
{
1802 1803
	struct acpi_device_pnp pnp = {};
	struct acpi_hardware_id *hwid;
1804 1805
	struct acpi_scan_handler *handler;

1806 1807
	INIT_LIST_HEAD(&pnp.ids);
	acpi_set_pnp_ids(handle, &pnp, type);
1808

1809
	if (!pnp.type.hardware_id)
1810
		goto out;
1811 1812 1813 1814 1815

	/*
	 * This relies on the fact that acpi_install_notify_handler() will not
	 * install the same notify handler routine twice for the same handle.
	 */
1816 1817 1818
	list_for_each_entry(hwid, &pnp.ids, list) {
		handler = acpi_scan_match_handler(hwid->id, NULL);
		if (handler) {
1819 1820
			acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					acpi_hotplug_notify_cb, handler);
1821 1822 1823 1824
			break;
		}
	}

1825
out:
1826
	acpi_free_pnp_ids(&pnp);
1827 1828
}

1829 1830
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
1831
{
1832
	struct acpi_device *device = NULL;
1833 1834 1835 1836
	int type;
	unsigned long long sta;
	int result;

1837 1838 1839 1840
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

1841 1842 1843 1844
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

1845 1846 1847 1848 1849
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

1850
	acpi_scan_init_hotplug(handle, type);
1851

1852
	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1853
	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1854 1855
		struct acpi_device_wakeup wakeup;

1856
		if (acpi_has_method(handle, "_PRW")) {
1857 1858
			acpi_bus_extract_wakeup_device_power_package(handle,
								     &wakeup);
1859 1860
			acpi_power_resources_list_free(&wakeup.resources);
		}
1861
		return AE_CTRL_DEPTH;
1862
	}
1863

1864
	acpi_add_single_object(&device, handle, type, sta);
1865
	if (!device)
1866
		return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
1867

1868
 out:
1869 1870
	if (!*return_value)
		*return_value = device;
1871

1872 1873
	return AE_OK;
}
1874

1875
static int acpi_scan_attach_handler(struct acpi_device *device)
1876
{
1877 1878
	struct acpi_hardware_id *hwid;
	int ret = 0;
1879

1880
	list_for_each_entry(hwid, &device->pnp.ids, list) {
1881
		const struct acpi_device_id *devid;
1882
		struct acpi_scan_handler *handler;
1883

1884 1885
		handler = acpi_scan_match_handler(hwid->id, &devid);
		if (handler) {
1886 1887 1888
			ret = handler->attach(device, devid);
			if (ret > 0) {
				device->handler = handler;
1889
				break;
1890
			} else if (ret < 0) {
1891
				break;
1892
			}
1893 1894 1895 1896 1897
		}
	}
	return ret;
}

1898 1899
static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
1900
{
1901 1902
	struct acpi_device *device;
	unsigned long long sta_not_used;
1903
	int ret;
1904

1905 1906 1907 1908
	/*
	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
	 * namespace walks prematurely.
	 */
1909
	if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1910
		return AE_OK;
L
Linus Torvalds 已提交
1911

1912 1913
	if (acpi_bus_get_device(handle, &device))
		return AE_CTRL_DEPTH;
1914

1915 1916 1917
	if (device->handler)
		return AE_OK;

1918 1919 1920 1921 1922 1923
	ret = acpi_scan_attach_handler(device);
	if (ret)
		return ret > 0 ? AE_OK : AE_CTRL_DEPTH;

	ret = device_attach(&device->dev);
	return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
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Linus Torvalds 已提交
1924 1925
}

1926
/**
1927
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1928
 * @handle: Root of the namespace scope to scan.
1929
 *
1930 1931
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
1932
 *
1933 1934 1935 1936
 * 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.
1937 1938
 *
 * Must be called under acpi_scan_lock.
1939
 */
1940
int acpi_bus_scan(acpi_handle handle)
1941
{
1942
	void *device = NULL;
1943
	int error = 0;
1944

1945 1946 1947
	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);
1948

1949
	if (!device)
1950 1951
		error = -ENODEV;
	else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1952 1953
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_device_attach, NULL, NULL, NULL);
1954

1955
	return error;
1956
}
1957
EXPORT_SYMBOL(acpi_bus_scan);
1958

1959 1960 1961 1962
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;
1963

1964
	if (!acpi_bus_get_device(handle, &device)) {
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
		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);
		}
1975 1976
	}
	return AE_OK;
1977
}
L
Linus Torvalds 已提交
1978

1979 1980
static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
				   void *not_used, void **ret_not_used)
L
Linus Torvalds 已提交
1981
{
1982
	struct acpi_device *device = NULL;
L
Len Brown 已提交
1983

1984 1985
	if (!acpi_bus_get_device(handle, &device))
		acpi_device_unregister(device);
L
Linus Torvalds 已提交
1986

1987 1988
	return AE_OK;
}
L
Linus Torvalds 已提交
1989

1990 1991 1992 1993 1994 1995
/**
 * 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.
 */
1996
void acpi_bus_trim(struct acpi_device *start)
L
Linus Torvalds 已提交
1997
{
1998 1999 2000 2001 2002 2003 2004
	/*
	 * 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);
2005 2006 2007 2008 2009 2010 2011
	/*
	 * Execute acpi_bus_remove() as a post-order callback to remove device
	 * nodes in the given namespace scope.
	 */
	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
			    acpi_bus_remove, NULL, NULL);
	acpi_bus_remove(start->handle, 0, NULL, NULL);
L
Linus Torvalds 已提交
2012
}
2013 2014
EXPORT_SYMBOL_GPL(acpi_bus_trim);

2015
static int acpi_bus_scan_fixed(void)
L
Linus Torvalds 已提交
2016
{
L
Len Brown 已提交
2017
	int result = 0;
L
Li Shaohua 已提交
2018

L
Linus Torvalds 已提交
2019 2020 2021
	/*
	 * Enumerate all fixed-feature devices.
	 */
2022 2023 2024
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

2025
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2026
						ACPI_BUS_TYPE_POWER_BUTTON,
2027 2028 2029 2030 2031 2032 2033 2034
						ACPI_STA_DEFAULT);
		if (result)
			return result;

		result = device_attach(&device->dev);
		if (result < 0)
			return result;

2035
		device_init_wakeup(&device->dev, true);
2036
	}
L
Linus Torvalds 已提交
2037

2038 2039 2040
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

2041
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2042
						ACPI_BUS_TYPE_SLEEP_BUTTON,
2043 2044 2045 2046 2047
						ACPI_STA_DEFAULT);
		if (result)
			return result;

		result = device_attach(&device->dev);
2048
	}
L
Linus Torvalds 已提交
2049

2050
	return result < 0 ? result : 0;
L
Linus Torvalds 已提交
2051 2052
}

2053
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
2054 2055 2056
{
	int result;

2057 2058 2059 2060 2061 2062
	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");
	}

2063
	acpi_pci_root_init();
2064
	acpi_pci_link_init();
2065
	acpi_processor_init();
2066
	acpi_platform_init();
2067
	acpi_lpss_init();
2068
	acpi_cmos_rtc_init();
2069
	acpi_container_init();
2070
	acpi_memory_hotplug_init();
2071
	acpi_dock_init();
2072

2073
	mutex_lock(&acpi_scan_lock);
L
Linus Torvalds 已提交
2074 2075 2076
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
2077 2078
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
2079
		goto out;
L
Linus Torvalds 已提交
2080

2081
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
2082
	if (result)
2083
		goto out;
L
Linus Torvalds 已提交
2084

2085 2086
	result = acpi_bus_scan_fixed();
	if (result) {
2087
		acpi_device_unregister(acpi_root);
2088
		goto out;
2089
	}
L
Linus Torvalds 已提交
2090

2091
	acpi_update_all_gpes();
2092

2093 2094
	acpi_pci_root_hp_init();

2095 2096 2097
 out:
	mutex_unlock(&acpi_scan_lock);
	return result;
L
Linus Torvalds 已提交
2098
}