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);
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	if (ACPI_SUCCESS(status)) {
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		result = device_create_file(&dev->dev, &dev_attr_eject);
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		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);
	}

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end:
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	return result;
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}

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static void acpi_device_remove_files(struct acpi_device *dev)
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{
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	acpi_status status;
	acpi_handle temp;
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	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);
	}

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	/*
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	 * 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.
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	 */
	status = acpi_get_handle(dev->handle, "_EJ0", &temp);
	if (ACPI_SUCCESS(status))
		device_remove_file(&dev->dev, &dev_attr_eject);
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	status = acpi_get_handle(dev->handle, "_SUN", &temp);
	if (ACPI_SUCCESS(status))
		device_remove_file(&dev->dev, &dev_attr_sun);

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	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
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	if (dev->pnp.type.bus_address)
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		device_remove_file(&dev->dev, &dev_attr_adr);
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	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
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	if (dev->handle)
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		device_remove_file(&dev->dev, &dev_attr_path);
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}
/* --------------------------------------------------------------------------
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			ACPI Bus operations
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   -------------------------------------------------------------------------- */
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static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
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{
	const struct acpi_device_id *id;
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	struct acpi_hardware_id *hwid;
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	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
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		return NULL;
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	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
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				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;
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	acpi_handle handle = ACPI_HANDLE(dev);
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	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
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		return NULL;

	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
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int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
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}
EXPORT_SYMBOL(acpi_match_device_ids);

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static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

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

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	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);
	}
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}

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static void acpi_device_release(struct device *dev)
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{
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	struct acpi_device *acpi_dev = to_acpi_device(dev);
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	acpi_free_pnp_ids(&acpi_dev->pnp);
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	acpi_free_power_resources_lists(acpi_dev);
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	kfree(acpi_dev);
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}

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static int acpi_bus_match(struct device *dev, struct device_driver *drv)
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{
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	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
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	return acpi_dev->flags.match_driver
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		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
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}
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static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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	struct acpi_device *acpi_dev = to_acpi_device(dev);
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	int len;
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	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

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	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;
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	return 0;
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}

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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;

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	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
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	return AE_OK;
}

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

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	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
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		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						     acpi_device_notify_fixed,
						     device);
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	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
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		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)
{
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	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
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		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
						acpi_device_notify_fixed);
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	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
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		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);
}

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static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
static int acpi_device_probe(struct device * dev)
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{
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	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) {
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		if (acpi_drv->ops.notify) {
			ret = acpi_device_install_notify_handler(acpi_dev);
			if (ret) {
				if (acpi_drv->ops.remove)
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					acpi_drv->ops.remove(acpi_dev);
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				acpi_dev->driver = NULL;
				acpi_dev->driver_data = NULL;
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				return ret;
			}
		}

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		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;
}
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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) {
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		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
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		if (acpi_drv->ops.remove)
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			acpi_drv->ops.remove(acpi_dev);
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	}
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	acpi_dev->driver = NULL;
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	acpi_dev->driver_data = NULL;
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	put_device(dev);
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	return 0;
}
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struct bus_type acpi_bus_type = {
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	.name		= "acpi",
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	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
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};

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int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
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{
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	int result;
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	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
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	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;
		}
	}

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	/*
	 * 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);
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	INIT_LIST_HEAD(&device->physical_node_list);
	mutex_init(&device->physical_node_lock);
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	INIT_LIST_HEAD(&device->power_dependent);
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	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
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		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
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	}
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	mutex_lock(&acpi_device_lock);
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	/*
	 * 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) {
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		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
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			found = 1;
			kfree(new_bus_id);
			break;
		}
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	}
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	if (!found) {
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		acpi_device_bus_id = new_bus_id;
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		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
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		acpi_device_bus_id->instance_no = 0;
		list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
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	}
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	dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
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	if (device->parent)
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		list_add_tail(&device->node, &device->parent->children);
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	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
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	mutex_unlock(&acpi_device_lock);
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	if (device->parent)
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		device->dev.parent = &device->parent->dev;
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	device->dev.bus = &acpi_bus_type;
943
	device->dev.release = release;
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	result = device_add(&device->dev);
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	if (result) {
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		dev_err(&device->dev, "Error registering device\n");
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		goto err;
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	}

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	result = acpi_device_setup_files(device);
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	if (result)
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		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
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	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
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	return 0;
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 err:
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	mutex_lock(&acpi_device_lock);
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	if (device->parent)
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		list_del(&device->node);
	list_del(&device->wakeup_list);
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	mutex_unlock(&acpi_device_lock);
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 err_detach:
	acpi_detach_data(device->handle, acpi_bus_data_handler);
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	return result;
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}

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static void acpi_device_unregister(struct acpi_device *device)
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{
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	mutex_lock(&acpi_device_lock);
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	if (device->parent)
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		list_del(&device->node);
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	list_del(&device->wakeup_list);
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	mutex_unlock(&acpi_device_lock);
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	acpi_detach_data(device->handle, acpi_bus_data_handler);
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981
	acpi_power_add_remove_device(device, false);
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	acpi_device_remove_files(device);
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	if (device->remove)
		device->remove(device);

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	device_del(&device->dev);
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	/*
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	 * 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.
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	 */
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	acpi_device_set_power(device, ACPI_STATE_D3_COLD);
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	device->handle = NULL;
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	put_device(&device->dev);
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}

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/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
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/**
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 * acpi_bus_driver_init - add a device to a driver
 * @device: the device to add and initialize
 * @driver: driver for the device
 *
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 * Used to initialize a device via its device driver.  Called whenever a
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 * driver is bound to a device.  Invokes the driver's add() ops.
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 */
static int
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acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
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{
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	int result = 0;
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	if (!device || !driver)
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		return -EINVAL;
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	if (!driver->ops.add)
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		return -ENOSYS;
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	result = driver->ops.add(device);
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	if (result)
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		return result;
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	device->driver = driver;

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

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	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver successfully bound to device\n"));
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	return 0;
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}

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/**
 * 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)
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{
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	int ret;
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	if (acpi_disabled)
		return -ENODEV;
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	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
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	ret = driver_register(&driver->drv);
	return ret;
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}
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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)
{
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	driver_unregister(&driver->drv);
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}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
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static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
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	struct acpi_device *device = NULL;
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	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.
	 */
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	if (!handle)
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		return acpi_root;

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

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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;
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		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
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		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

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void acpi_bus_data_handler(acpi_handle handle, void *context)
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