scan.c 53.1 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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static const char *dummy_hid = "device";
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static LIST_HEAD(acpi_device_list);
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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 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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	acpi_handle not_used;
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	struct acpi_object_list arg_list;
	union acpi_object arg;
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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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	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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	if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
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		arg_list.count = 1;
		arg_list.pointer = &arg;
		arg.type = ACPI_TYPE_INTEGER;
		arg.integer.value = 0;
		acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
	}

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = 1;

	/*
	 * TBD: _EJD support.
	 */
	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
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	if (ACPI_FAILURE(status)) {
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		if (status == AE_NOT_FOUND) {
			return -ENODEV;
		} else {
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			acpi_handle_warn(handle, "Eject failed (0x%x)\n",
								status);
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			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;

	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);
	if (handler->hotplug.mode == AHM_CONTAINER) {
		device->flags.eject_pending = true;
		kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
	} else {
		int error;

		get_device(&device->dev);
		error = acpi_scan_hot_remove(device);
		if (error)
			goto err_out;
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	}
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 out:
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	mutex_unlock(&acpi_scan_lock);
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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;

	mutex_lock(&acpi_scan_lock);

	acpi_bus_get_device(handle, &device);
	if (device) {
		dev_warn(&device->dev, "Attempt to re-insert\n");
		goto out;
	}
	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);
}

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;

	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);
	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;
	u32 ost_source;
	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;

	mutex_lock(&acpi_scan_lock);
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	if (acpi_device->flags.eject_pending) {
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		/* ACPI eject notification event. */
		ost_source = ACPI_NOTIFY_EJECT_REQUEST;
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		acpi_device->flags.eject_pending = 0;
	} else {
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		/* Eject initiated by user space. */
		ost_source = ACPI_OST_EC_OSPM_EJECT;
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	}
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	ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
	if (!ej_event) {
		ret = -ENOMEM;
		goto err_out;
	}
	acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
	ej_event->device = acpi_device;
	ej_event->event = ost_source;
	get_device(&acpi_device->dev);
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	status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
	if (ACPI_FAILURE(status)) {
		put_device(&acpi_device->dev);
		kfree(ej_event);
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		ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
		goto err_out;
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	}
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	ret = count;

 out:
	mutex_unlock(&acpi_scan_lock);
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	return ret;
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 err_out:
	acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
				  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
	goto out;
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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;
	acpi_handle temp;
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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
	 */
	status = acpi_get_handle(dev->handle, "_STR", &temp);
	if (ACPI_SUCCESS(status)) {
		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;
	}

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	if (dev->pnp.type.bus_address)
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		result = device_create_file(&dev->dev, &dev_attr_adr);
	if (dev->pnp.unique_id)
		result = device_create_file(&dev->dev, &dev_attr_uid);

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	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;
	}

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        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
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	status = acpi_get_handle(dev->handle, "_EJ0", &temp);
597
	if (ACPI_SUCCESS(status)) {
598
		result = device_create_file(&dev->dev, &dev_attr_eject);
599 600 601 602 603 604 605 606 607 608 609 610 611 612
		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);
	}

613
end:
614
	return result;
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615 616
}

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617
static void acpi_device_remove_files(struct acpi_device *dev)
L
Linus Torvalds 已提交
618
{
P
Patrick Mochel 已提交
619 620
	acpi_status status;
	acpi_handle temp;
L
Linus Torvalds 已提交
621

622 623 624 625 626 627 628
	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
629
	/*
630 631 632 633 634 635 636 637 638
	 * If device has _STR, remove 'description' file
	 */
	status = acpi_get_handle(dev->handle, "_STR", &temp);
	if (ACPI_SUCCESS(status)) {
		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
639 640 641 642
	 */
	status = acpi_get_handle(dev->handle, "_EJ0", &temp);
	if (ACPI_SUCCESS(status))
		device_remove_file(&dev->dev, &dev_attr_eject);
L
Linus Torvalds 已提交
643

Y
Yasuaki Ishimatsu 已提交
644 645 646 647
	status = acpi_get_handle(dev->handle, "_SUN", &temp);
	if (ACPI_SUCCESS(status))
		device_remove_file(&dev->dev, &dev_attr_sun);

648 649
	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
650
	if (dev->pnp.type.bus_address)
651
		device_remove_file(&dev->dev, &dev_attr_adr);
652 653
	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
654
	if (dev->handle)
655
		device_remove_file(&dev->dev, &dev_attr_path);
L
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656 657
}
/* --------------------------------------------------------------------------
Z
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658
			ACPI Bus operations
L
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659
   -------------------------------------------------------------------------- */
660

661 662
static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
663 664
{
	const struct acpi_device_id *id;
665
	struct acpi_hardware_id *hwid;
666

667 668 669 670 671
	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
672
		return NULL;
673

674 675 676
	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
				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;
697
	acpi_handle handle = ACPI_HANDLE(dev);
698

699
	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
700 701 702 703 704
		return NULL;

	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
705

706 707 708 709
int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
710 711 712
}
EXPORT_SYMBOL(acpi_match_device_ids);

713 714 715 716
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

717 718 719
	if (device->wakeup.flags.valid)
		acpi_power_resources_list_free(&device->wakeup.resources);

720 721 722 723 724 725 726
	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);
	}
727 728
}

729
static void acpi_device_release(struct device *dev)
L
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730
{
731
	struct acpi_device *acpi_dev = to_acpi_device(dev);
L
Linus Torvalds 已提交
732

733
	acpi_free_pnp_ids(&acpi_dev->pnp);
734
	acpi_free_power_resources_lists(acpi_dev);
735
	kfree(acpi_dev);
L
Linus Torvalds 已提交
736 737
}

738
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
Z
Zhang Rui 已提交
739
{
740 741
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
L
Linus Torvalds 已提交
742

743
	return acpi_dev->flags.match_driver
744
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
745
}
L
Linus Torvalds 已提交
746

747
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
L
Linus Torvalds 已提交
748
{
749
	struct acpi_device *acpi_dev = to_acpi_device(dev);
750
	int len;
751

752 753 754
	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

755 756 757 758 759 760 761
	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
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762
	return 0;
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763 764
}

765 766 767 768 769 770 771 772 773 774 775
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;

776 777
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
778 779 780 781 782 783 784
	return AE_OK;
}

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

785
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
786 787 788 789
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
790
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
		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)
{
808
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
809 810
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
811
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
812 813 814 815 816 817 818
		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);
}

819 820
static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_device_probe(struct device * dev)
L
Linus Torvalds 已提交
821
{
822 823 824 825 826 827
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

	ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
	if (!ret) {
828 829 830 831
		if (acpi_drv->ops.notify) {
			ret = acpi_device_install_notify_handler(acpi_dev);
			if (ret) {
				if (acpi_drv->ops.remove)
832
					acpi_drv->ops.remove(acpi_dev);
833 834
				acpi_dev->driver = NULL;
				acpi_dev->driver_data = NULL;
835 836 837 838
				return ret;
			}
		}

839 840 841 842 843 844 845
		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 ret;
}
L
Linus Torvalds 已提交
846

847 848 849 850 851 852
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) {
853 854
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
855
		if (acpi_drv->ops.remove)
856
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
857
	}
858
	acpi_dev->driver = NULL;
859
	acpi_dev->driver_data = NULL;
L
Linus Torvalds 已提交
860

861
	put_device(dev);
Z
Zhang Rui 已提交
862 863
	return 0;
}
L
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864

865
struct bus_type acpi_bus_type = {
Z
Zhang Rui 已提交
866
	.name		= "acpi",
867 868 869 870
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
Zhang Rui 已提交
871 872
};

873 874
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
L
Linus Torvalds 已提交
875
{
L
Len Brown 已提交
876
	int result;
877 878
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
879

880 881 882 883 884 885 886 887 888 889 890 891
	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
892 893 894 895 896 897 898 899
	/*
	 * 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);
900 901
	INIT_LIST_HEAD(&device->physical_node_list);
	mutex_init(&device->physical_node_lock);
902
	INIT_LIST_HEAD(&device->power_dependent);
L
Linus Torvalds 已提交
903

904 905
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
906 907 908
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
L
Linus Torvalds 已提交
909
	}
910

911
	mutex_lock(&acpi_device_lock);
912 913 914 915 916
	/*
	 * 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) {
917 918 919
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
920 921 922 923
			found = 1;
			kfree(new_bus_id);
			break;
		}
L
Linus Torvalds 已提交
924
	}
925
	if (!found) {
926
		acpi_device_bus_id = new_bus_id;
927
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
928 929
		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
930
	}
931
	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
932

L
Len Brown 已提交
933
	if (device->parent)
Z
Zhang Rui 已提交
934
		list_add_tail(&device->node, &device->parent->children);
L
Len Brown 已提交
935

Z
Zhang Rui 已提交
936 937
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
938
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
939

940
	if (device->parent)
941
		device->dev.parent = &device->parent->dev;
942
	device->dev.bus = &acpi_bus_type;
943
	device->dev.release = release;
944
	result = device_add(&device->dev);
945
	if (result) {
946
		dev_err(&device->dev, "Error registering device\n");
947
		goto err;
L
Linus Torvalds 已提交
948 949
	}

950
	result = acpi_device_setup_files(device);
951
	if (result)
952 953
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
L
Linus Torvalds 已提交
954

955
	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
L
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956
	return 0;
957 958

 err:
959
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
960
	if (device->parent)
961 962
		list_del(&device->node);
	list_del(&device->wakeup_list);
963
	mutex_unlock(&acpi_device_lock);
964 965 966

 err_detach:
	acpi_detach_data(device->handle, acpi_bus_data_handler);
967
	return result;
L
Linus Torvalds 已提交
968 969
}

970
static void acpi_device_unregister(struct acpi_device *device)
Z
Zhang Rui 已提交
971
{
972
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
973
	if (device->parent)
Z
Zhang Rui 已提交
974
		list_del(&device->node);
L
Linus Torvalds 已提交
975

Z
Zhang Rui 已提交
976
	list_del(&device->wakeup_list);
977
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
978

Z
Zhang Rui 已提交
979
	acpi_detach_data(device->handle, acpi_bus_data_handler);
980

981
	acpi_power_add_remove_device(device, false);
P
Patrick Mochel 已提交
982
	acpi_device_remove_files(device);
983 984 985
	if (device->remove)
		device->remove(device);

986
	device_del(&device->dev);
987
	/*
988 989 990
	 * 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.
991
	 */
992
	acpi_device_set_power(device, ACPI_STATE_D3_COLD);
993
	device->handle = NULL;
994
	put_device(&device->dev);
L
Linus Torvalds 已提交
995 996
}

Z
Zhang Rui 已提交
997 998 999
/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
L
Linus Torvalds 已提交
1000
/**
1001 1002 1003 1004
 * acpi_bus_driver_init - add a device to a driver
 * @device: the device to add and initialize
 * @driver: driver for the device
 *
1005
 * Used to initialize a device via its device driver.  Called whenever a
1006
 * driver is bound to a device.  Invokes the driver's add() ops.
L
Linus Torvalds 已提交
1007 1008
 */
static int
L
Len Brown 已提交
1009
acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
L
Linus Torvalds 已提交
1010
{
L
Len Brown 已提交
1011
	int result = 0;
L
Linus Torvalds 已提交
1012 1013

	if (!device || !driver)
1014
		return -EINVAL;
L
Linus Torvalds 已提交
1015 1016

	if (!driver->ops.add)
1017
		return -ENOSYS;
L
Linus Torvalds 已提交
1018 1019 1020 1021

	result = driver->ops.add(device);
	if (result) {
		device->driver = NULL;
1022
		device->driver_data = NULL;
1023
		return result;
L
Linus Torvalds 已提交
1024 1025 1026 1027 1028 1029 1030 1031 1032
	}

	device->driver = driver;

	/*
	 * TBD - Configuration Management: Assign resources to device based
	 * upon possible configuration and currently allocated resources.
	 */

L
Len Brown 已提交
1033 1034
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver successfully bound to device\n"));
1035
	return 0;
1036 1037
}

Z
Zhang Rui 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046
/**
 * 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
1047
{
1048
	int ret;
L
Linus Torvalds 已提交
1049

Z
Zhang Rui 已提交
1050 1051
	if (acpi_disabled)
		return -ENODEV;
1052 1053 1054
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
1055

1056 1057
	ret = driver_register(&driver->drv);
	return ret;
Z
Zhang Rui 已提交
1058
}
L
Linus Torvalds 已提交
1059

Z
Zhang Rui 已提交
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
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)
{
1071
	driver_unregister(&driver->drv);
Z
Zhang Rui 已提交
1072 1073 1074 1075 1076 1077 1078
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
1079 1080
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
1081
	struct acpi_device *device = NULL;
1082 1083 1084 1085 1086 1087 1088
	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.
	 */
1089
	if (!handle)
1090 1091 1092 1093 1094
		return acpi_root;

	do {
		status = acpi_get_parent(handle, &handle);
		if (ACPI_FAILURE(status))
1095 1096 1097
			return status == AE_NULL_ENTRY ? NULL : acpi_root;
	} while (acpi_bus_get_device(handle, &device));
	return device;
1098 1099
}

Z
Zhang Rui 已提交
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
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;
1115 1116
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
1117 1118 1119 1120 1121 1122
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

1123
void acpi_bus_data_handler(acpi_handle handle, void *context)
Z
Zhang Rui 已提交
1124 1125 1126 1127 1128 1129 1130
{

	/* TBD */

	return;
}

1131 1132
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
1133
{
1134 1135
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
1136
	union acpi_object *element = NULL;
1137
	acpi_status status;
1138
	int err = -ENODATA;
Z
Zhang Rui 已提交
1139

1140
	if (!wakeup)
1141
		return -EINVAL;
Z
Zhang Rui 已提交
1142

1143
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
1144

1145 1146 1147 1148
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1149
		return err;
1150 1151 1152 1153
	}

	package = (union acpi_object *)buffer.pointer;

1154
	if (!package || package->package.count < 2)
1155 1156
		goto out;

Z
Zhang Rui 已提交
1157
	element = &(package->package.elements[0]);
1158
	if (!element)
1159
		goto out;
1160

Z
Zhang Rui 已提交
1161 1162 1163 1164
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
1165
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1166
			goto out;
1167

1168
		wakeup->gpe_device =
Z
Zhang Rui 已提交
1169
		    element->package.elements[0].reference.handle;
1170
		wakeup->gpe_number =
Z
Zhang Rui 已提交
1171 1172
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
1173 1174 1175 1176 1177
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
1178 1179

	element = &(package->package.elements[1]);
1180
	if (element->type != ACPI_TYPE_INTEGER)
1181
		goto out;
1182

1183
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
1184

1185 1186
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
1187
		goto out;
Z
Zhang Rui 已提交
1188

1189 1190
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1191

1192 1193 1194 1195 1196 1197 1198 1199
		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;
		}
1200 1201 1202 1203 1204 1205 1206
		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
1207
	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1208

1209 1210
 out:
	kfree(buffer.pointer);
1211
	return err;
L
Linus Torvalds 已提交
1212 1213
}

1214
static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1215
{
1216 1217
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1218
		{"PNP0C0D", 0},
1219 1220 1221
		{"PNP0C0E", 0},
		{"", 0},
	};
1222 1223 1224
	acpi_status status;
	acpi_event_status event_status;

1225
	device->wakeup.flags.notifier_present = 0;
1226 1227 1228 1229

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
		device->wakeup.flags.run_wake = 1;
1230 1231 1232 1233 1234
		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;
		}
1235
		device_set_wakeup_capable(&device->dev, true);
1236 1237 1238
		return;
	}

1239 1240 1241
	status = acpi_get_gpe_status(device->wakeup.gpe_device,
					device->wakeup.gpe_number,
						&event_status);
1242 1243 1244 1245 1246
	if (status == AE_OK)
		device->wakeup.flags.run_wake =
				!!(event_status & ACPI_EVENT_FLAG_HANDLE);
}

1247
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1248
{
1249
	acpi_handle temp;
1250
	acpi_status status = 0;
1251
	int err;
1252

1253 1254 1255 1256 1257
	/* Presence of _PRW indicates wake capable */
	status = acpi_get_handle(device->handle, "_PRW", &temp);
	if (ACPI_FAILURE(status))
		return;

1258 1259 1260 1261
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1262
		return;
Z
Zhang Rui 已提交
1263
	}
L
Linus Torvalds 已提交
1264

Z
Zhang Rui 已提交
1265
	device->wakeup.flags.valid = 1;
1266
	device->wakeup.prepare_count = 0;
1267
	acpi_bus_set_run_wake_flags(device);
1268 1269 1270 1271 1272 1273
	/* 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.
	 */
1274 1275
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1276 1277
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1278 1279
}

1280 1281 1282
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1283 1284
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1285 1286
	acpi_handle handle;
	acpi_status status;
1287

1288 1289
	INIT_LIST_HEAD(&ps->resources);

1290 1291 1292 1293 1294 1295 1296 1297
	/* 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) {
1298 1299 1300
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1301
				device->power.flags.power_resources = 1;
1302
		}
1303
		ACPI_FREE(buffer.pointer);
1304 1305 1306
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1307 1308
	pathname[2] = 'S';
	status = acpi_get_handle(device->handle, pathname, &handle);
1309 1310 1311 1312 1313 1314 1315
	if (ACPI_SUCCESS(status))
		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.
	 */
1316
	if (!list_empty(&ps->resources)
1317 1318 1319 1320 1321 1322 1323 1324 1325
	    || (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 */
}

1326
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1327
{
1328 1329 1330
	acpi_status status;
	acpi_handle handle;
	u32 i;
B
Bjorn Helgaas 已提交
1331

1332 1333 1334 1335 1336 1337 1338
	/* Presence of _PS0|_PR0 indicates 'power manageable' */
	status = acpi_get_handle(device->handle, "_PS0", &handle);
	if (ACPI_FAILURE(status)) {
		status = acpi_get_handle(device->handle, "_PR0", &handle);
		if (ACPI_FAILURE(status))
			return;
	}
B
Bjorn Helgaas 已提交
1339

1340
	device->flags.power_manageable = 1;
L
Len Brown 已提交
1341

Z
Zhang Rui 已提交
1342 1343 1344 1345 1346 1347 1348 1349 1350
	/*
	 * Power Management Flags
	 */
	status = acpi_get_handle(device->handle, "_PSC", &handle);
	if (ACPI_SUCCESS(status))
		device->power.flags.explicit_get = 1;
	status = acpi_get_handle(device->handle, "_IRC", &handle);
	if (ACPI_SUCCESS(status))
		device->power.flags.inrush_current = 1;
L
Linus Torvalds 已提交
1351

Z
Zhang Rui 已提交
1352 1353 1354
	/*
	 * Enumerate supported power management states
	 */
1355 1356
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1357

1358
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1359

Z
Zhang Rui 已提交
1360 1361 1362 1363 1364
	/* 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;
	device->power.states[ACPI_STATE_D3].flags.valid = 1;
	device->power.states[ACPI_STATE_D3].power = 0;
L
Len Brown 已提交
1365

1366 1367 1368 1369
	/* 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;

1370 1371 1372 1373 1374
	/* 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;

1375 1376 1377 1378
	if (acpi_bus_init_power(device)) {
		acpi_free_power_resources_lists(device);
		device->flags.power_manageable = 0;
	}
Z
Zhang Rui 已提交
1379
}
L
Len Brown 已提交
1380

1381
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1382
{
L
Len Brown 已提交
1383 1384
	acpi_status status = AE_OK;
	acpi_handle temp = NULL;
L
Linus Torvalds 已提交
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406

	/* Presence of _STA indicates 'dynamic_status' */
	status = acpi_get_handle(device->handle, "_STA", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.dynamic_status = 1;

	/* Presence of _RMV indicates 'removable' */
	status = acpi_get_handle(device->handle, "_RMV", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
	status = acpi_get_handle(device->handle, "_EJD", &temp);
	if (ACPI_SUCCESS(status))
		device->flags.ejectable = 1;
	else {
		status = acpi_get_handle(device->handle, "_EJ0", &temp);
		if (ACPI_SUCCESS(status))
			device->flags.ejectable = 1;
	}
}

1407
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1408
{
L
Len Brown 已提交
1409 1410 1411
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1412 1413 1414 1415 1416 1417 1418

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1419
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1420
		strcpy(device->pnp.bus_id, "ACPI");
1421 1422 1423 1424
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1425 1426 1427 1428 1429 1430 1431
	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:
1432
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
		/* 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;
	}
}

1445
/*
1446
 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1447 1448 1449 1450
 *
 * 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
 */
1451 1452
static int acpi_bay_match(acpi_handle handle)
{
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478
	acpi_status status;
	acpi_handle tmp;
	acpi_handle phandle;

	status = acpi_get_handle(handle, "_EJ0", &tmp);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
		(ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
		(ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
		(ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
		return 0;

	if (acpi_get_parent(handle, &phandle))
		return -ENODEV;

        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
                return 0;

	return -ENODEV;
}

1479
/*
1480
 * acpi_dock_match - see if an acpi object has a _DCK method
1481
 */
1482
static int acpi_dock_match(acpi_handle handle)
1483 1484
{
	acpi_handle tmp;
1485
	return acpi_get_handle(handle, "_DCK", &tmp);
1486 1487
}

1488
const char *acpi_device_hid(struct acpi_device *device)
1489
{
1490
	struct acpi_hardware_id *hid;
1491

1492 1493 1494
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1495 1496 1497 1498
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1499

1500
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1501 1502
{
	struct acpi_hardware_id *id;
1503

1504 1505 1506
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1507

T
Thomas Meyer 已提交
1508
	id->id = kstrdup(dev_id, GFP_KERNEL);
1509 1510 1511
	if (!id->id) {
		kfree(id);
		return;
1512 1513
	}

1514 1515
	list_add_tail(&id->list, &pnp->ids);
	pnp->type.hardware_id = 1;
1516 1517
}

1518 1519 1520 1521 1522
/*
 * 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.
 */
1523
static int acpi_ibm_smbus_match(acpi_handle handle)
1524 1525 1526 1527 1528 1529 1530 1531 1532
{
	acpi_handle h_dummy;
	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
	int result;

	if (!dmi_name_in_vendors("IBM"))
		return -ENODEV;

	/* Look for SMBS object */
1533
	result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
	if (result)
		return result;

	if (strcmp("SMBS", path.pointer)) {
		result = -ENODEV;
		goto out;
	}

	/* Does it have the necessary (but misnamed) methods? */
	result = -ENODEV;
1544 1545 1546
	if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
	    ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
	    ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
1547 1548 1549 1550 1551 1552
		result = 0;
out:
	kfree(path.pointer);
	return result;
}

1553 1554
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
				int device_type)
L
Linus Torvalds 已提交
1555
{
L
Len Brown 已提交
1556
	acpi_status status;
1557
	struct acpi_device_info *info;
1558
	struct acpi_pnp_device_id_list *cid_list;
1559
	int i;
L
Linus Torvalds 已提交
1560

1561
	switch (device_type) {
L
Linus Torvalds 已提交
1562
	case ACPI_BUS_TYPE_DEVICE:
1563 1564
		if (handle == ACPI_ROOT_OBJECT) {
			acpi_add_id(pnp, ACPI_SYSTEM_HID);
1565 1566 1567
			break;
		}

1568
		status = acpi_get_object_info(handle, &info);
L
Linus Torvalds 已提交
1569
		if (ACPI_FAILURE(status)) {
1570 1571
			pr_err(PREFIX "%s: Error reading device info\n",
					__func__);
L
Linus Torvalds 已提交
1572 1573 1574 1575
			return;
		}

		if (info->valid & ACPI_VALID_HID)
1576
			acpi_add_id(pnp, info->hardware_id.string);
1577
		if (info->valid & ACPI_VALID_CID) {
1578
			cid_list = &info->compatible_id_list;
1579
			for (i = 0; i < cid_list->count; i++)
1580
				acpi_add_id(pnp, cid_list->ids[i].string);
1581
		}
L
Linus Torvalds 已提交
1582
		if (info->valid & ACPI_VALID_ADR) {
1583 1584
			pnp->bus_address = info->address;
			pnp->type.bus_address = 1;
L
Linus Torvalds 已提交
1585
		}
1586
		if (info->valid & ACPI_VALID_UID)
1587
			pnp->unique_id = kstrdup(info->unique_id.string,
1588
							GFP_KERNEL);
1589

1590 1591
		kfree(info);

1592 1593 1594 1595
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
		if (acpi_is_video_device(handle))
			acpi_add_id(pnp, ACPI_VIDEO_HID);
		else if (ACPI_SUCCESS(acpi_bay_match(handle)))
			acpi_add_id(pnp, ACPI_BAY_HID);
		else if (ACPI_SUCCESS(acpi_dock_match(handle)))
			acpi_add_id(pnp, ACPI_DOCK_HID);
		else if (!acpi_ibm_smbus_match(handle))
			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);
1608
		}
1609

L
Linus Torvalds 已提交
1610 1611
		break;
	case ACPI_BUS_TYPE_POWER:
1612
		acpi_add_id(pnp, ACPI_POWER_HID);
L
Linus Torvalds 已提交
1613 1614
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1615
		acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
L
Linus Torvalds 已提交
1616 1617
		break;
	case ACPI_BUS_TYPE_THERMAL:
1618
		acpi_add_id(pnp, ACPI_THERMAL_HID);
L
Linus Torvalds 已提交
1619 1620
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1621
		acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
L
Linus Torvalds 已提交
1622 1623
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1624
		acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
L
Linus Torvalds 已提交
1625 1626 1627 1628
		break;
	}
}

1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
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);
}

1640 1641
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
1642
{
1643 1644 1645 1646 1647 1648
	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);
1649
	acpi_set_pnp_ids(handle, &device->pnp, type);
1650
	acpi_bus_get_flags(device);
1651
	device->flags.match_driver = false;
1652 1653 1654
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
1655

1656 1657
void acpi_device_add_finalize(struct acpi_device *device)
{
1658
	device->flags.match_driver = true;
1659 1660
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
L
Linus Torvalds 已提交
1661 1662
}

1663 1664
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
1665
				  unsigned long long sta)
L
Linus Torvalds 已提交
1666
{
1667 1668
	int result;
	struct acpi_device *device;
1669
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
1670

1671
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
Linus Torvalds 已提交
1672
	if (!device) {
1673
		printk(KERN_ERR PREFIX "Memory allocation error\n");
1674
		return -ENOMEM;
L
Linus Torvalds 已提交
1675 1676
	}

1677 1678
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
1679
	acpi_bus_get_wakeup_device_flags(device);
L
Linus Torvalds 已提交
1680

1681
	result = acpi_device_add(device, acpi_device_release);
1682
	if (result) {
1683
		acpi_device_release(&device->dev);
1684 1685
		return result;
	}
L
Linus Torvalds 已提交
1686

1687
	acpi_power_add_remove_device(device, true);
1688
	acpi_device_add_finalize(device);
1689 1690 1691 1692 1693 1694 1695
	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;
1696 1697
}

1698 1699
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
1700
{
1701 1702
	acpi_status status;
	acpi_object_type acpi_type;
L
Linus Torvalds 已提交
1703

1704
	status = acpi_get_type(handle, &acpi_type);
1705
	if (ACPI_FAILURE(status))
1706
		return -ENODEV;
L
Len Brown 已提交
1707

1708
	switch (acpi_type) {
1709 1710
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
1711 1712 1713 1714
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1715 1716
		break;
	case ACPI_TYPE_PROCESSOR:
1717 1718 1719 1720
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
1721 1722
		break;
	case ACPI_TYPE_THERMAL:
1723 1724
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
1725 1726
		break;
	case ACPI_TYPE_POWER:
1727 1728
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
1729 1730
		break;
	default:
1731
		return -ENODEV;
1732
	}
L
Linus Torvalds 已提交
1733

1734 1735 1736
	return 0;
}

1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
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;
}

1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
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;
}

1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
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);
}

1778
static void acpi_scan_init_hotplug(acpi_handle handle, int type)
1779
{
1780 1781
	struct acpi_device_pnp pnp = {};
	struct acpi_hardware_id *hwid;
1782 1783
	struct acpi_scan_handler *handler;

1784 1785
	INIT_LIST_HEAD(&pnp.ids);
	acpi_set_pnp_ids(handle, &pnp, type);
1786

1787
	if (!pnp.type.hardware_id)
1788 1789 1790 1791 1792 1793
		return;

	/*
	 * This relies on the fact that acpi_install_notify_handler() will not
	 * install the same notify handler routine twice for the same handle.
	 */
1794 1795 1796
	list_for_each_entry(hwid, &pnp.ids, list) {
		handler = acpi_scan_match_handler(hwid->id, NULL);
		if (handler) {
1797 1798
			acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					acpi_hotplug_notify_cb, handler);
1799 1800 1801 1802 1803
			break;
		}
	}

	acpi_free_pnp_ids(&pnp);
1804 1805
}

1806 1807
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
1808
{
1809
	struct acpi_device *device = NULL;
1810 1811
	int type;
	unsigned long long sta;
1812
	acpi_status status;
1813 1814
	int result;

1815 1816 1817 1818
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

1819 1820 1821 1822
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

1823 1824 1825 1826 1827
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

1828
	acpi_scan_init_hotplug(handle, type);
1829

1830
	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1831
	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1832 1833 1834 1835
		struct acpi_device_wakeup wakeup;
		acpi_handle temp;

		status = acpi_get_handle(handle, "_PRW", &temp);
1836
		if (ACPI_SUCCESS(status)) {
1837 1838
			acpi_bus_extract_wakeup_device_power_package(handle,
								     &wakeup);
1839 1840
			acpi_power_resources_list_free(&wakeup.resources);
		}
1841
		return AE_CTRL_DEPTH;
1842
	}
1843

1844
	acpi_add_single_object(&device, handle, type, sta);
1845
	if (!device)
1846
		return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
1847

1848
 out:
1849 1850
	if (!*return_value)
		*return_value = device;
1851

1852 1853
	return AE_OK;
}
1854

1855
static int acpi_scan_attach_handler(struct acpi_device *device)
1856
{
1857 1858
	struct acpi_hardware_id *hwid;
	int ret = 0;
1859

1860
	list_for_each_entry(hwid, &device->pnp.ids, list) {
1861
		const struct acpi_device_id *devid;
1862
		struct acpi_scan_handler *handler;
1863

1864 1865
		handler = acpi_scan_match_handler(hwid->id, &devid);
		if (handler) {
1866 1867 1868
			ret = handler->attach(device, devid);
			if (ret > 0) {
				device->handler = handler;
1869
				break;
1870
			} else if (ret < 0) {
1871
				break;
1872
			}
1873 1874 1875 1876 1877
		}
	}
	return ret;
}

1878 1879
static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
					  void *not_used, void **ret_not_used)
1880
{
1881 1882
	struct acpi_device *device;
	unsigned long long sta_not_used;
1883
	int ret;
1884

1885 1886 1887 1888
	/*
	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
	 * namespace walks prematurely.
	 */
1889
	if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1890
		return AE_OK;
L
Linus Torvalds 已提交
1891

1892 1893
	if (acpi_bus_get_device(handle, &device))
		return AE_CTRL_DEPTH;
1894

1895 1896 1897 1898 1899 1900
	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;
L
Linus Torvalds 已提交
1901 1902
}

1903
/**
1904
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1905
 * @handle: Root of the namespace scope to scan.
1906
 *
1907 1908
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
1909
 *
1910 1911 1912 1913
 * 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.
1914 1915
 *
 * Must be called under acpi_scan_lock.
1916
 */
1917
int acpi_bus_scan(acpi_handle handle)
1918
{
1919
	void *device = NULL;
1920
	int error = 0;
1921

1922 1923 1924
	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);
1925

1926
	if (!device)
1927 1928
		error = -ENODEV;
	else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1929 1930
		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
				    acpi_bus_device_attach, NULL, NULL, NULL);
1931

1932
	return error;
1933
}
1934
EXPORT_SYMBOL(acpi_bus_scan);
1935

1936 1937 1938 1939
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;
1940

1941
	if (!acpi_bus_get_device(handle, &device)) {
1942 1943
		struct acpi_scan_handler *dev_handler = device->handler;

1944
		device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1945 1946 1947 1948 1949 1950 1951 1952
		if (dev_handler) {
			if (dev_handler->detach)
				dev_handler->detach(device);

			device->handler = NULL;
		} else {
			device_release_driver(&device->dev);
		}
1953 1954
	}
	return AE_OK;
1955
}
L
Linus Torvalds 已提交
1956

1957 1958
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
1959
{
1960
	struct acpi_device *device = NULL;
L
Len Brown 已提交
1961

1962 1963
	if (!acpi_bus_get_device(handle, &device))
		acpi_device_unregister(device);
L
Linus Torvalds 已提交
1964

1965 1966
	return AE_OK;
}
L
Linus Torvalds 已提交
1967

1968 1969 1970 1971 1972 1973
/**
 * 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.
 */
1974
void acpi_bus_trim(struct acpi_device *start)
L
Linus Torvalds 已提交
1975
{
1976 1977 1978 1979 1980 1981 1982
	/*
	 * 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);
1983 1984 1985 1986 1987 1988 1989
	/*
	 * 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
1990
}
1991 1992
EXPORT_SYMBOL_GPL(acpi_bus_trim);

1993
static int acpi_bus_scan_fixed(void)
L
Linus Torvalds 已提交
1994
{
L
Len Brown 已提交
1995
	int result = 0;
L
Li Shaohua 已提交
1996

L
Linus Torvalds 已提交
1997 1998 1999
	/*
	 * Enumerate all fixed-feature devices.
	 */
2000 2001 2002
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

2003
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2004
						ACPI_BUS_TYPE_POWER_BUTTON,
2005 2006 2007 2008 2009 2010 2011 2012
						ACPI_STA_DEFAULT);
		if (result)
			return result;

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

2013
		device_init_wakeup(&device->dev, true);
2014
	}
L
Linus Torvalds 已提交
2015

2016 2017 2018
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

2019
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2020
						ACPI_BUS_TYPE_SLEEP_BUTTON,
2021 2022 2023 2024 2025
						ACPI_STA_DEFAULT);
		if (result)
			return result;

		result = device_attach(&device->dev);
2026
	}
L
Linus Torvalds 已提交
2027

2028
	return result < 0 ? result : 0;
L
Linus Torvalds 已提交
2029 2030
}

2031
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
2032 2033 2034
{
	int result;

2035 2036 2037 2038 2039 2040
	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");
	}

2041
	acpi_pci_root_init();
2042
	acpi_pci_link_init();
2043
	acpi_platform_init();
2044
	acpi_lpss_init();
2045
	acpi_csrt_init();
2046
	acpi_container_init();
2047
	acpi_memory_hotplug_init();
2048

2049
	mutex_lock(&acpi_scan_lock);
L
Linus Torvalds 已提交
2050 2051 2052
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
2053 2054
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
2055
		goto out;
L
Linus Torvalds 已提交
2056

2057
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
2058
	if (result)
2059
		goto out;
L
Linus Torvalds 已提交
2060

2061 2062
	result = acpi_bus_scan_fixed();
	if (result) {
2063
		acpi_device_unregister(acpi_root);
2064
		goto out;
2065
	}
L
Linus Torvalds 已提交
2066

2067
	acpi_update_all_gpes();
2068

2069 2070
	acpi_pci_root_hp_init();

2071 2072 2073
 out:
	mutex_unlock(&acpi_scan_lock);
	return result;
L
Linus Torvalds 已提交
2074
}