scan.c 62.6 KB
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/*
 * scan.c - support for transforming the ACPI namespace into individual objects
 */

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

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#include "internal.h"

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

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

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#define INVALID_ACPI_HANDLE	((acpi_handle)empty_zero_page)

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

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

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

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

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

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void acpi_initialize_hp_context(struct acpi_device *adev,
				struct acpi_hotplug_context *hp,
				int (*notify)(struct acpi_device *, u32),
				void (*uevent)(struct acpi_device *, u32))
{
	acpi_lock_hp_context();
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	hp->notify = notify;
	hp->uevent = uevent;
	acpi_set_hp_context(adev, hp);
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	acpi_unlock_hp_context();
}
EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);

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

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

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

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

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

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

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	/*
	 * If the device has PRP0001 we expose DT compatible modalias
	 * instead in form of of:NnameTCcompatible.
	 */
	if (acpi_dev->data.of_compatible) {
		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
		const union acpi_object *of_compatible, *obj;
		int i, nval;
		char *c;

		acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf);
		/* DT strings are all in lower case */
		for (c = buf.pointer; *c != '\0'; c++)
			*c = tolower(*c);

		len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer);
		ACPI_FREE(buf.pointer);

		of_compatible = acpi_dev->data.of_compatible;
		if (of_compatible->type == ACPI_TYPE_PACKAGE) {
			nval = of_compatible->package.count;
			obj = of_compatible->package.elements;
		} else { /* Must be ACPI_TYPE_STRING. */
			nval = 1;
			obj = of_compatible;
		}
		for (i = 0; i < nval; i++, obj++) {
			count = snprintf(&modalias[len], size, "C%s",
					 obj->string.pointer);
			if (count < 0)
				return -EINVAL;
			if (count >= size)
				return -ENOMEM;

			len += count;
			size -= count;
		}
	} else {
		len = snprintf(modalias, size, "acpi:");
		size -= len;

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

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

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/*
 * acpi_companion_match() - Can we match via ACPI companion device
 * @dev: Device in question
 *
 * Check if the given device has an ACPI companion and if that companion has
 * a valid list of PNP IDs, and if the device is the first (primary) physical
 * device associated with it.
 *
 * If multiple physical devices are attached to a single ACPI companion, we need
 * to be careful.  The usage scenario for this kind of relationship is that all
 * of the physical devices in question use resources provided by the ACPI
 * companion.  A typical case is an MFD device where all the sub-devices share
 * the parent's ACPI companion.  In such cases we can only allow the primary
 * (first) physical device to be matched with the help of the companion's PNP
 * IDs.
 *
 * Additional physical devices sharing the ACPI companion can still use
 * resources available from it but they will be matched normally using functions
 * provided by their bus types (and analogously for their modalias).
 */
static bool acpi_companion_match(const struct device *dev)
{
	struct acpi_device *adev;
	bool ret;

	adev = ACPI_COMPANION(dev);
	if (!adev)
		return false;

	if (list_empty(&adev->pnp.ids))
		return false;

	mutex_lock(&adev->physical_node_lock);
	if (list_empty(&adev->physical_node_list)) {
		ret = false;
	} else {
		const struct acpi_device_physical_node *node;

		node = list_first_entry(&adev->physical_node_list,
					struct acpi_device_physical_node, node);
		ret = node->dev == dev;
	}
	mutex_unlock(&adev->physical_node_lock);

	return ret;
}

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

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	if (!acpi_companion_match(dev))
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		return -ENODEV;

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

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

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	if (!acpi_companion_match(dev))
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		return -ENODEV;

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

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

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

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

	mutex_lock(&adev->physical_node_lock);

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

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			offline = false;
			break;
		}

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

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

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

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

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	mutex_lock(&device->physical_node_lock);

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

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

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

	mutex_unlock(&device->physical_node_lock);

	return status;
}

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

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

	mutex_lock(&device->physical_node_lock);

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

	mutex_unlock(&device->physical_node_lock);

	return AE_OK;
}

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

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

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

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

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

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

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

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

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

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void acpi_device_hotplug(struct acpi_device *adev, u32 src)
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{
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
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	int error = -ENODEV;
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	lock_device_hotplug();
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	mutex_lock(&acpi_scan_lock);
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	/*
	 * The device object's ACPI handle cannot become invalid as long as we
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	 * are holding acpi_scan_lock, but it might have become invalid before
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	 * that lock was acquired.
	 */
	if (adev->handle == INVALID_ACPI_HANDLE)
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		goto err_out;
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	if (adev->flags.is_dock_station) {
		error = dock_notify(adev, src);
	} else if (adev->flags.hotplug_notify) {
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		error = acpi_generic_hotplug_event(adev, src);
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		if (error == -EPERM) {
			ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
			goto err_out;
		}
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	} else {
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		int (*notify)(struct acpi_device *, u32);
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		acpi_lock_hp_context();
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		notify = adev->hp ? adev->hp->notify : NULL;
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		acpi_unlock_hp_context();
		/*
		 * There may be additional notify handlers for device objects
		 * without the .event() callback, so ignore them here.
		 */
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		if (notify)
			error = notify(adev, src);
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		else
			goto out;
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	}
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	if (!error)
		ost_code = ACPI_OST_SC_SUCCESS;
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 err_out:
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	acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
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 out:
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	acpi_bus_put_acpi_device(adev);
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	mutex_unlock(&acpi_scan_lock);
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	unlock_device_hotplug();
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}

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

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

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

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

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

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

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

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

649 650 651 652 653 654 655 656 657
	if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
	    && !acpi_device->driver)
		return -ENODEV;

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

	get_device(&acpi_device->dev);
658
	status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
659 660
	if (ACPI_SUCCESS(status))
		return count;
661

662
	put_device(&acpi_device->dev);
663 664
	acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
			  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
665
	return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
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Linus Torvalds 已提交
666 667
}

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Patrick Mochel 已提交
668
static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
L
Linus Torvalds 已提交
669

670 671 672
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);
L
Linus Torvalds 已提交
673

674
	return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
L
Linus Torvalds 已提交
675
}
676
static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
L
Linus Torvalds 已提交
677

678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
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);

697 698 699 700 701
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;
L
Linus Torvalds 已提交
702

703
	result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
704
	if (result)
705
		goto end;
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Linus Torvalds 已提交
706

707 708
	result = sprintf(buf, "%s\n", (char*)path.pointer);
	kfree(path.pointer);
709
end:
710
	return result;
L
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711
}
712
static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
L
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713

714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
/* sysfs file that shows description text from the ACPI _STR method */
static ssize_t description_show(struct device *dev,
				struct device_attribute *attr,
				char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	int result;

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

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

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

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

Y
Yasuaki Ishimatsu 已提交
740 741 742 743
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);
744 745
	acpi_status status;
	unsigned long long sun;
Y
Yasuaki Ishimatsu 已提交
746

747 748 749 750 751
	status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return sprintf(buf, "%llu\n", sun);
Y
Yasuaki Ishimatsu 已提交
752 753 754
}
static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);

755 756 757 758 759 760 761 762 763 764 765 766 767 768
static ssize_t status_show(struct device *dev, struct device_attribute *attr,
				char *buf) {
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	acpi_status status;
	unsigned long long sta;

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

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

769
static int acpi_device_setup_files(struct acpi_device *dev)
L
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770
{
771
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
P
Patrick Mochel 已提交
772
	acpi_status status;
773
	int result = 0;
L
Linus Torvalds 已提交
774 775

	/*
776
	 * Devices gotten from FADT don't have a "path" attribute
L
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777
	 */
778
	if (dev->handle) {
779
		result = device_create_file(&dev->dev, &dev_attr_path);
780
		if (result)
781
			goto end;
L
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782 783
	}

784 785 786 787
	if (!list_empty(&dev->pnp.ids)) {
		result = device_create_file(&dev->dev, &dev_attr_hid);
		if (result)
			goto end;
L
Linus Torvalds 已提交
788

789 790 791 792
		result = device_create_file(&dev->dev, &dev_attr_modalias);
		if (result)
			goto end;
	}
793

794 795 796
	/*
	 * If device has _STR, 'description' file is created
	 */
797
	if (acpi_has_method(dev->handle, "_STR")) {
798 799 800 801 802 803 804 805 806 807
		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;
	}

808
	if (dev->pnp.type.bus_address)
809 810 811 812
		result = device_create_file(&dev->dev, &dev_attr_adr);
	if (dev->pnp.unique_id)
		result = device_create_file(&dev->dev, &dev_attr_uid);

813
	if (acpi_has_method(dev->handle, "_SUN")) {
Y
Yasuaki Ishimatsu 已提交
814 815 816 817 818
		result = device_create_file(&dev->dev, &dev_attr_sun);
		if (result)
			goto end;
	}

819 820 821 822 823 824
	if (acpi_has_method(dev->handle, "_STA")) {
		result = device_create_file(&dev->dev, &dev_attr_status);
		if (result)
			goto end;
	}

825 826 827 828
        /*
         * If device has _EJ0, 'eject' file is created that is used to trigger
         * hot-removal function from userland.
         */
829
	if (acpi_has_method(dev->handle, "_EJ0")) {
830
		result = device_create_file(&dev->dev, &dev_attr_eject);
831 832 833 834 835 836 837 838 839 840 841 842 843 844
		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);
	}

845
end:
846
	return result;
L
Linus Torvalds 已提交
847 848
}

P
Patrick Mochel 已提交
849
static void acpi_device_remove_files(struct acpi_device *dev)
L
Linus Torvalds 已提交
850
{
851 852 853 854 855 856 857
	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
858
	/*
859 860
	 * If device has _STR, remove 'description' file
	 */
861
	if (acpi_has_method(dev->handle, "_STR")) {
862 863 864 865 866
		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
867
	 */
868
	if (acpi_has_method(dev->handle, "_EJ0"))
P
Patrick Mochel 已提交
869
		device_remove_file(&dev->dev, &dev_attr_eject);
L
Linus Torvalds 已提交
870

871
	if (acpi_has_method(dev->handle, "_SUN"))
Y
Yasuaki Ishimatsu 已提交
872 873
		device_remove_file(&dev->dev, &dev_attr_sun);

874 875
	if (dev->pnp.unique_id)
		device_remove_file(&dev->dev, &dev_attr_uid);
876
	if (dev->pnp.type.bus_address)
877
		device_remove_file(&dev->dev, &dev_attr_adr);
878 879
	device_remove_file(&dev->dev, &dev_attr_modalias);
	device_remove_file(&dev->dev, &dev_attr_hid);
880 881
	if (acpi_has_method(dev->handle, "_STA"))
		device_remove_file(&dev->dev, &dev_attr_status);
882
	if (dev->handle)
883
		device_remove_file(&dev->dev, &dev_attr_path);
L
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884 885
}
/* --------------------------------------------------------------------------
Z
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886
			ACPI Bus operations
L
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887
   -------------------------------------------------------------------------- */
888

889 890
static const struct acpi_device_id *__acpi_match_device(
	struct acpi_device *device, const struct acpi_device_id *ids)
891 892
{
	const struct acpi_device_id *id;
893
	struct acpi_hardware_id *hwid;
894

895 896 897 898 899
	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device->status.present)
900
		return NULL;
901

902 903 904
	for (id = ids; id->id[0]; id++)
		list_for_each_entry(hwid, &device->pnp.ids, list)
			if (!strcmp((char *) id->id, hwid->id))
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
				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;
925
	acpi_handle handle = ACPI_HANDLE(dev);
926

927
	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
928 929
		return NULL;

930 931 932
	if (!acpi_companion_match(dev))
		return NULL;

933 934 935
	return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
936

937 938 939 940
int acpi_match_device_ids(struct acpi_device *device,
			  const struct acpi_device_id *ids)
{
	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
941 942 943
}
EXPORT_SYMBOL(acpi_match_device_ids);

944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
/* Performs match against special "PRP0001" shoehorn ACPI ID */
static bool acpi_of_driver_match_device(struct device *dev,
					const struct device_driver *drv)
{
	const union acpi_object *of_compatible, *obj;
	struct acpi_device *adev;
	int i, nval;

	adev = ACPI_COMPANION(dev);
	if (!adev)
		return false;

	of_compatible = adev->data.of_compatible;
	if (!drv->of_match_table || !of_compatible)
		return false;

	if (of_compatible->type == ACPI_TYPE_PACKAGE) {
		nval = of_compatible->package.count;
		obj = of_compatible->package.elements;
	} else { /* Must be ACPI_TYPE_STRING. */
		nval = 1;
		obj = of_compatible;
	}
	/* Now we can look for the driver DT compatible strings */
	for (i = 0; i < nval; i++, obj++) {
		const struct of_device_id *id;

		for (id = drv->of_match_table; id->compatible[0]; id++)
			if (!strcasecmp(obj->string.pointer, id->compatible))
				return true;
	}

	return false;
}

bool acpi_driver_match_device(struct device *dev,
			      const struct device_driver *drv)
{
	if (!drv->acpi_match_table)
		return acpi_of_driver_match_device(dev, drv);

	return !!acpi_match_device(drv->acpi_match_table, dev);
}
EXPORT_SYMBOL_GPL(acpi_driver_match_device);

989 990 991 992
static void acpi_free_power_resources_lists(struct acpi_device *device)
{
	int i;

993 994 995
	if (device->wakeup.flags.valid)
		acpi_power_resources_list_free(&device->wakeup.resources);

996 997 998 999 1000 1001 1002
	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);
	}
1003 1004
}

1005
static void acpi_device_release(struct device *dev)
L
Linus Torvalds 已提交
1006
{
1007
	struct acpi_device *acpi_dev = to_acpi_device(dev);
L
Linus Torvalds 已提交
1008

1009
	acpi_free_properties(acpi_dev);
1010
	acpi_free_pnp_ids(&acpi_dev->pnp);
1011
	acpi_free_power_resources_lists(acpi_dev);
1012
	kfree(acpi_dev);
L
Linus Torvalds 已提交
1013 1014
}

1015
static int acpi_bus_match(struct device *dev, struct device_driver *drv)
Z
Zhang Rui 已提交
1016
{
1017 1018
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(drv);
L
Linus Torvalds 已提交
1019

1020
	return acpi_dev->flags.match_driver
1021
		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
1022
}
L
Linus Torvalds 已提交
1023

1024
static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
L
Linus Torvalds 已提交
1025
{
1026
	struct acpi_device *acpi_dev = to_acpi_device(dev);
1027
	int len;
1028

1029 1030 1031
	if (list_empty(&acpi_dev->pnp.ids))
		return 0;

1032 1033 1034 1035
	if (add_uevent_var(env, "MODALIAS="))
		return -ENOMEM;
	len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
			      sizeof(env->buf) - env->buflen);
1036 1037
	if (len <= 0)
		return len;
1038
	env->buflen += len;
Z
Zhang Rui 已提交
1039
	return 0;
L
Linus Torvalds 已提交
1040 1041
}

1042 1043 1044 1045 1046 1047 1048
static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = data;

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

1049
static void acpi_device_notify_fixed(void *data)
1050 1051 1052
{
	struct acpi_device *device = data;

1053 1054
	/* Fixed hardware devices have no handles */
	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
1055 1056 1057 1058 1059
}

static acpi_status acpi_device_fixed_event(void *data)
{
	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
1060 1061 1062 1063 1064 1065 1066
	return AE_OK;
}

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

1067
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1068 1069
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1070
						     acpi_device_fixed_event,
1071
						     device);
1072
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1073 1074
		status =
		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1075
						     acpi_device_fixed_event,
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
						     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)
{
1090
	if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
1091
		acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
1092
						acpi_device_fixed_event);
1093
	else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
1094
		acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
1095
						acpi_device_fixed_event);
1096 1097 1098 1099 1100
	else
		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
					   acpi_device_notify);
}

1101
static int acpi_device_probe(struct device *dev)
L
Linus Torvalds 已提交
1102
{
1103 1104 1105 1106
	struct acpi_device *acpi_dev = to_acpi_device(dev);
	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
	int ret;

1107
	if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1108 1109
		return -EINVAL;

1110 1111
	if (!acpi_drv->ops.add)
		return -ENOSYS;
1112

1113 1114 1115
	ret = acpi_drv->ops.add(acpi_dev);
	if (ret)
		return ret;
1116

1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
	acpi_dev->driver = acpi_drv;
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Driver [%s] successfully bound to device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));

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

			acpi_dev->driver = NULL;
			acpi_dev->driver_data = NULL;
			return ret;
		}
1132
	}
1133 1134 1135 1136 1137

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
			  acpi_drv->name, acpi_dev->pnp.bus_id));
	get_device(dev);
	return 0;
1138
}
L
Linus Torvalds 已提交
1139

1140 1141 1142 1143 1144 1145
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) {
1146 1147
		if (acpi_drv->ops.notify)
			acpi_device_remove_notify_handler(acpi_dev);
1148
		if (acpi_drv->ops.remove)
1149
			acpi_drv->ops.remove(acpi_dev);
L
Linus Torvalds 已提交
1150
	}
1151
	acpi_dev->driver = NULL;
1152
	acpi_dev->driver_data = NULL;
L
Linus Torvalds 已提交
1153

1154
	put_device(dev);
Z
Zhang Rui 已提交
1155 1156
	return 0;
}
L
Linus Torvalds 已提交
1157

1158
struct bus_type acpi_bus_type = {
Z
Zhang Rui 已提交
1159
	.name		= "acpi",
1160 1161 1162 1163
	.match		= acpi_bus_match,
	.probe		= acpi_device_probe,
	.remove		= acpi_device_remove,
	.uevent		= acpi_device_uevent,
Z
Zhang Rui 已提交
1164 1165
};

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
static void acpi_device_del(struct acpi_device *device)
{
	mutex_lock(&acpi_device_lock);
	if (device->parent)
		list_del(&device->node);

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

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

	device_del(&device->dev);
}

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

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

		mutex_lock(&acpi_device_del_lock);

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

		mutex_unlock(&acpi_device_del_lock);

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

/**
 * acpi_scan_drop_device - Drop an ACPI device object.
 * @handle: Handle of an ACPI namespace node, not used.
 * @context: Address of the ACPI device object to drop.
 *
 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
 * namespace node the device object pointed to by @context is attached to.
 *
 * The unregistration is carried out asynchronously to avoid running
 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
 * ensure the correct ordering (the device objects must be unregistered in the
 * same order in which the corresponding namespace nodes are deleted).
 */
static void acpi_scan_drop_device(acpi_handle handle, void *context)
1227
{
1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
	static DECLARE_WORK(work, acpi_device_del_work_fn);
	struct acpi_device *adev = context;

	mutex_lock(&acpi_device_del_lock);

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

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

	mutex_unlock(&acpi_device_del_lock);
1251 1252
}

1253 1254
static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
				void (*callback)(void *))
1255 1256 1257 1258 1259 1260
{
	acpi_status status;

	if (!device)
		return -EINVAL;

1261 1262
	status = acpi_get_data_full(handle, acpi_scan_drop_device,
				    (void **)device, callback);
1263 1264 1265 1266 1267 1268 1269
	if (ACPI_FAILURE(status) || !*device) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
				  handle));
		return -ENODEV;
	}
	return 0;
}
1270 1271 1272 1273 1274

int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
	return acpi_get_device_data(handle, device, NULL);
}
1275
EXPORT_SYMBOL(acpi_bus_get_device);
1276

1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
static void get_acpi_device(void *dev)
{
	if (dev)
		get_device(&((struct acpi_device *)dev)->dev);
}

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

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

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

1296 1297
int acpi_device_add(struct acpi_device *device,
		    void (*release)(struct device *))
L
Linus Torvalds 已提交
1298
{
L
Len Brown 已提交
1299
	int result;
1300 1301
	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
	int found = 0;
1302

1303 1304 1305
	if (device->handle) {
		acpi_status status;

1306
		status = acpi_attach_data(device->handle, acpi_scan_drop_device,
1307 1308 1309 1310 1311 1312 1313 1314
					  device);
		if (ACPI_FAILURE(status)) {
			acpi_handle_err(device->handle,
					"Unable to attach device data\n");
			return -ENODEV;
		}
	}

Z
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1315 1316 1317 1318 1319 1320 1321 1322
	/*
	 * 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);
1323
	INIT_LIST_HEAD(&device->physical_node_list);
1324
	INIT_LIST_HEAD(&device->del_list);
1325
	mutex_init(&device->physical_node_lock);
L
Linus Torvalds 已提交
1326

1327 1328
	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
	if (!new_bus_id) {
1329 1330 1331
		pr_err(PREFIX "Memory allocation error\n");
		result = -ENOMEM;
		goto err_detach;
L
Linus Torvalds 已提交
1332
	}
1333

1334
	mutex_lock(&acpi_device_lock);
1335 1336 1337 1338 1339
	/*
	 * 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) {
1340 1341 1342
		if (!strcmp(acpi_device_bus_id->bus_id,
			    acpi_device_hid(device))) {
			acpi_device_bus_id->instance_no++;
1343 1344 1345 1346
			found = 1;
			kfree(new_bus_id);
			break;
		}
L
Linus Torvalds 已提交
1347
	}
1348
	if (!found) {
1349
		acpi_device_bus_id = new_bus_id;
1350
		strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
1351 1352
		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
1353
	}
1354
	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
1355

L
Len Brown 已提交
1356
	if (device->parent)
Z
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1357
		list_add_tail(&device->node, &device->parent->children);
L
Len Brown 已提交
1358

Z
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1359 1360
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
1361
	mutex_unlock(&acpi_device_lock);
L
Linus Torvalds 已提交
1362

1363
	if (device->parent)
1364
		device->dev.parent = &device->parent->dev;
1365
	device->dev.bus = &acpi_bus_type;
1366
	device->dev.release = release;
1367
	result = device_add(&device->dev);
1368
	if (result) {
1369
		dev_err(&device->dev, "Error registering device\n");
1370
		goto err;
L
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1371 1372
	}

1373
	result = acpi_device_setup_files(device);
1374
	if (result)
1375 1376
		printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
		       dev_name(&device->dev));
L
Linus Torvalds 已提交
1377 1378

	return 0;
1379 1380

 err:
1381
	mutex_lock(&acpi_device_lock);
L
Len Brown 已提交
1382
	if (device->parent)
1383 1384
		list_del(&device->node);
	list_del(&device->wakeup_list);
1385
	mutex_unlock(&acpi_device_lock);
1386 1387

 err_detach:
1388
	acpi_detach_data(device->handle, acpi_scan_drop_device);
1389
	return result;
L
Linus Torvalds 已提交
1390 1391
}

Z
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1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
/* --------------------------------------------------------------------------
                                 Driver Management
   -------------------------------------------------------------------------- */
/**
 * acpi_bus_register_driver - register a driver with the ACPI bus
 * @driver: driver being registered
 *
 * Registers a driver with the ACPI bus.  Searches the namespace for all
 * devices that match the driver's criteria and binds.  Returns zero for
 * success or a negative error status for failure.
 */
int acpi_bus_register_driver(struct acpi_driver *driver)
L
Linus Torvalds 已提交
1404
{
1405
	int ret;
L
Linus Torvalds 已提交
1406

Z
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1407 1408
	if (acpi_disabled)
		return -ENODEV;
1409 1410 1411
	driver->drv.name = driver->name;
	driver->drv.bus = &acpi_bus_type;
	driver->drv.owner = driver->owner;
L
Linus Torvalds 已提交
1412

1413 1414
	ret = driver_register(&driver->drv);
	return ret;
Z
Zhang Rui 已提交
1415
}
L
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1416

Z
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1417 1418 1419
EXPORT_SYMBOL(acpi_bus_register_driver);

/**
1420
 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
Z
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1421 1422 1423 1424 1425 1426 1427
 * @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)
{
1428
	driver_unregister(&driver->drv);
Z
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1429 1430 1431 1432 1433 1434 1435
}

EXPORT_SYMBOL(acpi_bus_unregister_driver);

/* --------------------------------------------------------------------------
                                 Device Enumeration
   -------------------------------------------------------------------------- */
1436 1437
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
{
1438
	struct acpi_device *device = NULL;
1439 1440 1441 1442 1443 1444 1445
	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.
	 */
1446
	if (!handle)
1447 1448 1449 1450 1451
		return acpi_root;

	do {
		status = acpi_get_parent(handle, &handle);
		if (ACPI_FAILURE(status))
1452 1453 1454
			return status == AE_NULL_ENTRY ? NULL : acpi_root;
	} while (acpi_bus_get_device(handle, &device));
	return device;
1455 1456
}

Z
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1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
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;
1472 1473
		status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
					 ejd);
Z
Zhang Rui 已提交
1474 1475 1476 1477 1478 1479
		kfree(buffer.pointer);
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);

1480 1481
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
					struct acpi_device_wakeup *wakeup)
Z
Zhang Rui 已提交
1482
{
1483 1484
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package = NULL;
Z
Zhang Rui 已提交
1485
	union acpi_object *element = NULL;
1486
	acpi_status status;
1487
	int err = -ENODATA;
Z
Zhang Rui 已提交
1488

1489
	if (!wakeup)
1490
		return -EINVAL;
Z
Zhang Rui 已提交
1491

1492
	INIT_LIST_HEAD(&wakeup->resources);
Z
Zhang Rui 已提交
1493

1494 1495 1496 1497
	/* _PRW */
	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
1498
		return err;
1499 1500 1501 1502
	}

	package = (union acpi_object *)buffer.pointer;

1503
	if (!package || package->package.count < 2)
1504 1505
		goto out;

Z
Zhang Rui 已提交
1506
	element = &(package->package.elements[0]);
1507
	if (!element)
1508
		goto out;
1509

Z
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1510 1511 1512 1513
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
1514
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
1515
			goto out;
1516

1517
		wakeup->gpe_device =
Z
Zhang Rui 已提交
1518
		    element->package.elements[0].reference.handle;
1519
		wakeup->gpe_number =
Z
Zhang Rui 已提交
1520 1521
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
1522 1523 1524 1525 1526
		wakeup->gpe_device = NULL;
		wakeup->gpe_number = element->integer.value;
	} else {
		goto out;
	}
Z
Zhang Rui 已提交
1527 1528

	element = &(package->package.elements[1]);
1529
	if (element->type != ACPI_TYPE_INTEGER)
1530
		goto out;
1531

1532
	wakeup->sleep_state = element->integer.value;
Z
Zhang Rui 已提交
1533

1534 1535
	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
	if (err)
1536
		goto out;
Z
Zhang Rui 已提交
1537

1538 1539
	if (!list_empty(&wakeup->resources)) {
		int sleep_state;
Z
Zhang Rui 已提交
1540

1541 1542 1543 1544 1545 1546 1547 1548
		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;
		}
1549 1550 1551 1552 1553 1554 1555
		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;
		}
	}
1556

1557 1558
 out:
	kfree(buffer.pointer);
1559
	return err;
L
Linus Torvalds 已提交
1560 1561
}

1562
static void acpi_wakeup_gpe_init(struct acpi_device *device)
L
Linus Torvalds 已提交
1563
{
1564 1565
	struct acpi_device_id button_device_ids[] = {
		{"PNP0C0C", 0},
1566
		{"PNP0C0D", 0},
1567 1568 1569
		{"PNP0C0E", 0},
		{"", 0},
	};
1570
	struct acpi_device_wakeup *wakeup = &device->wakeup;
1571 1572 1573
	acpi_status status;
	acpi_event_status event_status;

1574
	wakeup->flags.notifier_present = 0;
1575 1576 1577

	/* Power button, Lid switch always enable wakeup */
	if (!acpi_match_device_ids(device, button_device_ids)) {
1578
		wakeup->flags.run_wake = 1;
1579 1580
		if (!acpi_match_device_ids(device, &button_device_ids[1])) {
			/* Do not use Lid/sleep button for S5 wakeup */
1581 1582
			if (wakeup->sleep_state == ACPI_STATE_S5)
				wakeup->sleep_state = ACPI_STATE_S4;
1583
		}
1584
		acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
1585
		device_set_wakeup_capable(&device->dev, true);
1586 1587 1588
		return;
	}

1589 1590 1591 1592 1593 1594 1595
	acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
				wakeup->gpe_number);
	status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
				     &event_status);
	if (ACPI_FAILURE(status))
		return;

1596
	wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
1597 1598
}

1599
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1600
{
1601
	int err;
1602

1603
	/* Presence of _PRW indicates wake capable */
1604
	if (!acpi_has_method(device->handle, "_PRW"))
1605 1606
		return;

1607 1608 1609 1610
	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
							   &device->wakeup);
	if (err) {
		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1611
		return;
Z
Zhang Rui 已提交
1612
	}
L
Linus Torvalds 已提交
1613

Z
Zhang Rui 已提交
1614
	device->wakeup.flags.valid = 1;
1615
	device->wakeup.prepare_count = 0;
1616
	acpi_wakeup_gpe_init(device);
1617 1618 1619 1620 1621 1622
	/* 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.
	 */
1623 1624
	err = acpi_device_sleep_wake(device, 0, 0, 0);
	if (err)
1625 1626
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"error in _DSW or _PSW evaluation\n"));
L
Linus Torvalds 已提交
1627 1628
}

1629 1630 1631
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
{
	struct acpi_device_power_state *ps = &device->power.states[state];
1632 1633
	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1634
	acpi_status status;
1635

1636 1637
	INIT_LIST_HEAD(&ps->resources);

1638 1639 1640 1641 1642 1643 1644 1645
	/* 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) {
1646 1647 1648
			int err = acpi_extract_power_resources(package, 0,
							       &ps->resources);
			if (!err)
1649
				device->power.flags.power_resources = 1;
1650
		}
1651
		ACPI_FREE(buffer.pointer);
1652 1653 1654
	}

	/* Evaluate "_PSx" to see if we can do explicit sets */
1655
	pathname[2] = 'S';
1656
	if (acpi_has_method(device->handle, pathname))
1657 1658 1659 1660 1661 1662
		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.
	 */
1663
	if (!list_empty(&ps->resources)
1664 1665 1666 1667 1668 1669 1670 1671 1672
	    || (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 */
}

1673
static void acpi_bus_get_power_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1674
{
1675
	u32 i;
B
Bjorn Helgaas 已提交
1676

1677
	/* Presence of _PS0|_PR0 indicates 'power manageable' */
1678 1679 1680
	if (!acpi_has_method(device->handle, "_PS0") &&
	    !acpi_has_method(device->handle, "_PR0"))
		return;
B
Bjorn Helgaas 已提交
1681

1682
	device->flags.power_manageable = 1;
L
Len Brown 已提交
1683

Z
Zhang Rui 已提交
1684 1685 1686
	/*
	 * Power Management Flags
	 */
1687
	if (acpi_has_method(device->handle, "_PSC"))
Z
Zhang Rui 已提交
1688
		device->power.flags.explicit_get = 1;
1689

1690
	if (acpi_has_method(device->handle, "_IRC"))
Z
Zhang Rui 已提交
1691
		device->power.flags.inrush_current = 1;
L
Linus Torvalds 已提交
1692

1693 1694 1695
	if (acpi_has_method(device->handle, "_DSW"))
		device->power.flags.dsw_present = 1;

Z
Zhang Rui 已提交
1696 1697 1698
	/*
	 * Enumerate supported power management states
	 */
1699 1700
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
		acpi_bus_init_power_state(device, i);
1701

1702
	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
L
Linus Torvalds 已提交
1703

Z
Zhang Rui 已提交
1704 1705 1706
	/* 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;
1707 1708
	device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
	device->power.states[ACPI_STATE_D3_COLD].power = 0;
L
Len Brown 已提交
1709

1710 1711 1712 1713
	/* 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;

1714 1715 1716 1717 1718
	/* 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;

1719 1720 1721 1722
	if (acpi_bus_init_power(device)) {
		acpi_free_power_resources_lists(device);
		device->flags.power_manageable = 0;
	}
Z
Zhang Rui 已提交
1723
}
L
Len Brown 已提交
1724

1725
static void acpi_bus_get_flags(struct acpi_device *device)
L
Linus Torvalds 已提交
1726 1727
{
	/* Presence of _STA indicates 'dynamic_status' */
1728
	if (acpi_has_method(device->handle, "_STA"))
L
Linus Torvalds 已提交
1729 1730 1731
		device->flags.dynamic_status = 1;

	/* Presence of _RMV indicates 'removable' */
1732
	if (acpi_has_method(device->handle, "_RMV"))
L
Linus Torvalds 已提交
1733 1734 1735
		device->flags.removable = 1;

	/* Presence of _EJD|_EJ0 indicates 'ejectable' */
1736 1737
	if (acpi_has_method(device->handle, "_EJD") ||
	    acpi_has_method(device->handle, "_EJ0"))
L
Linus Torvalds 已提交
1738 1739 1740
		device->flags.ejectable = 1;
}

1741
static void acpi_device_get_busid(struct acpi_device *device)
L
Linus Torvalds 已提交
1742
{
L
Len Brown 已提交
1743 1744 1745
	char bus_id[5] = { '?', 0 };
	struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
	int i = 0;
L
Linus Torvalds 已提交
1746 1747 1748 1749 1750 1751 1752

	/*
	 * Bus ID
	 * ------
	 * The device's Bus ID is simply the object name.
	 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
	 */
1753
	if (ACPI_IS_ROOT_DEVICE(device)) {
L
Linus Torvalds 已提交
1754
		strcpy(device->pnp.bus_id, "ACPI");
1755 1756 1757 1758
		return;
	}

	switch (device->device_type) {
L
Linus Torvalds 已提交
1759 1760 1761 1762 1763 1764 1765
	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:
1766
		acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
L
Linus Torvalds 已提交
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778
		/* 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;
	}
}

1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
/*
 * acpi_ata_match - see if an acpi object is an ATA device
 *
 * If an acpi object has one of the ACPI ATA methods defined,
 * then we can safely call it an ATA device.
 */
bool acpi_ata_match(acpi_handle handle)
{
	return acpi_has_method(handle, "_GTF") ||
	       acpi_has_method(handle, "_GTM") ||
	       acpi_has_method(handle, "_STM") ||
	       acpi_has_method(handle, "_SDD");
}

1793
/*
1794
 * acpi_bay_match - see if an acpi object is an ejectable driver bay
1795 1796 1797 1798
 *
 * 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
 */
1799
bool acpi_bay_match(acpi_handle handle)
1800
{
1801 1802
	acpi_handle phandle;

1803
	if (!acpi_has_method(handle, "_EJ0"))
1804 1805 1806 1807 1808
		return false;
	if (acpi_ata_match(handle))
		return true;
	if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
		return false;
1809

1810
	return acpi_ata_match(phandle);
1811 1812
}

1813
bool acpi_device_is_battery(struct acpi_device *adev)
1814
{
1815
	struct acpi_hardware_id *hwid;
1816

1817 1818 1819
	list_for_each_entry(hwid, &adev->pnp.ids, list)
		if (!strcmp("PNP0C0A", hwid->id))
			return true;
1820

1821
	return false;
1822 1823
}

1824
static bool is_ejectable_bay(struct acpi_device *adev)
1825
{
1826 1827 1828
	acpi_handle handle = adev->handle;

	if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
1829 1830 1831 1832 1833
		return true;

	return acpi_bay_match(handle);
}

1834
/*
1835
 * acpi_dock_match - see if an acpi object has a _DCK method
1836
 */
1837
bool acpi_dock_match(acpi_handle handle)
1838
{
1839
	return acpi_has_method(handle, "_DCK");
1840 1841
}

1842
const char *acpi_device_hid(struct acpi_device *device)
1843
{
1844
	struct acpi_hardware_id *hid;
1845

1846 1847 1848
	if (list_empty(&device->pnp.ids))
		return dummy_hid;

1849 1850 1851 1852
	hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
	return hid->id;
}
EXPORT_SYMBOL(acpi_device_hid);
1853

1854
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
1855 1856
{
	struct acpi_hardware_id *id;
1857

1858 1859 1860
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return;
1861

T
Thomas Meyer 已提交
1862
	id->id = kstrdup(dev_id, GFP_KERNEL);
1863 1864 1865
	if (!id->id) {
		kfree(id);
		return;
1866 1867
	}

1868 1869
	list_add_tail(&id->list, &pnp->ids);
	pnp->type.hardware_id = 1;
1870 1871
}

1872 1873 1874 1875 1876
/*
 * 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.
 */
1877
static bool acpi_ibm_smbus_match(acpi_handle handle)
1878
{
1879 1880
	char node_name[ACPI_PATH_SEGMENT_LENGTH];
	struct acpi_buffer path = { sizeof(node_name), node_name };
1881 1882

	if (!dmi_name_in_vendors("IBM"))
1883
		return false;
1884 1885

	/* Look for SMBS object */
1886 1887 1888
	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
	    strcmp("SMBS", path.pointer))
		return false;
1889 1890

	/* Does it have the necessary (but misnamed) methods? */
1891 1892 1893
	if (acpi_has_method(handle, "SBI") &&
	    acpi_has_method(handle, "SBR") &&
	    acpi_has_method(handle, "SBW"))
1894 1895 1896
		return true;

	return false;
1897 1898
}

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
static bool acpi_object_is_system_bus(acpi_handle handle)
{
	acpi_handle tmp;

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

	return false;
}

1913 1914
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
				int device_type)
L
Linus Torvalds 已提交
1915
{
L
Len Brown 已提交
1916
	acpi_status status;
1917
	struct acpi_device_info *info;
1918
	struct acpi_pnp_device_id_list *cid_list;
1919
	int i;
L
Linus Torvalds 已提交
1920

1921
	switch (device_type) {
L
Linus Torvalds 已提交
1922
	case ACPI_BUS_TYPE_DEVICE:
1923 1924
		if (handle == ACPI_ROOT_OBJECT) {
			acpi_add_id(pnp, ACPI_SYSTEM_HID);
1925 1926 1927
			break;
		}

1928
		status = acpi_get_object_info(handle, &info);
L
Linus Torvalds 已提交
1929
		if (ACPI_FAILURE(status)) {
1930 1931
			pr_err(PREFIX "%s: Error reading device info\n",
					__func__);
L
Linus Torvalds 已提交
1932 1933 1934
			return;
		}

1935
		if (info->valid & ACPI_VALID_HID) {
1936
			acpi_add_id(pnp, info->hardware_id.string);
1937 1938
			pnp->type.platform_id = 1;
		}
1939
		if (info->valid & ACPI_VALID_CID) {
1940
			cid_list = &info->compatible_id_list;
1941
			for (i = 0; i < cid_list->count; i++)
1942
				acpi_add_id(pnp, cid_list->ids[i].string);
1943
		}
L
Linus Torvalds 已提交
1944
		if (info->valid & ACPI_VALID_ADR) {
1945 1946
			pnp->bus_address = info->address;
			pnp->type.bus_address = 1;
L
Linus Torvalds 已提交
1947
		}
1948
		if (info->valid & ACPI_VALID_UID)
1949
			pnp->unique_id = kstrdup(info->unique_id.string,
1950
							GFP_KERNEL);
1951

1952 1953
		kfree(info);

1954 1955 1956 1957
		/*
		 * Some devices don't reliably have _HIDs & _CIDs, so add
		 * synthetic HIDs to make sure drivers can find them.
		 */
1958 1959
		if (acpi_is_video_device(handle))
			acpi_add_id(pnp, ACPI_VIDEO_HID);
1960
		else if (acpi_bay_match(handle))
1961
			acpi_add_id(pnp, ACPI_BAY_HID);
1962
		else if (acpi_dock_match(handle))
1963
			acpi_add_id(pnp, ACPI_DOCK_HID);
1964
		else if (acpi_ibm_smbus_match(handle))
1965
			acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1966 1967 1968 1969
		else if (list_empty(&pnp->ids) &&
			 acpi_object_is_system_bus(handle)) {
			/* \_SB, \_TZ, LNXSYBUS */
			acpi_add_id(pnp, ACPI_BUS_HID);
1970 1971
			strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
			strcpy(pnp->device_class, ACPI_BUS_CLASS);
1972
		}
1973

L
Linus Torvalds 已提交
1974 1975
		break;
	case ACPI_BUS_TYPE_POWER:
1976
		acpi_add_id(pnp, ACPI_POWER_HID);
L
Linus Torvalds 已提交
1977 1978
		break;
	case ACPI_BUS_TYPE_PROCESSOR:
1979
		acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
L
Linus Torvalds 已提交
1980 1981
		break;
	case ACPI_BUS_TYPE_THERMAL:
1982
		acpi_add_id(pnp, ACPI_THERMAL_HID);
L
Linus Torvalds 已提交
1983 1984
		break;
	case ACPI_BUS_TYPE_POWER_BUTTON:
1985
		acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
L
Linus Torvalds 已提交
1986 1987
		break;
	case ACPI_BUS_TYPE_SLEEP_BUTTON:
1988
		acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
L
Linus Torvalds 已提交
1989 1990 1991 1992
		break;
	}
}

1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
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);
}

2004 2005
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
			     int type, unsigned long long sta)
L
Linus Torvalds 已提交
2006
{
2007 2008 2009 2010
	INIT_LIST_HEAD(&device->pnp.ids);
	device->device_type = type;
	device->handle = handle;
	device->parent = acpi_bus_get_parent(handle);
2011
	acpi_set_device_status(device, sta);
2012
	acpi_device_get_busid(device);
2013
	acpi_set_pnp_ids(handle, &device->pnp, type);
2014
	acpi_init_properties(device);
2015
	acpi_bus_get_flags(device);
2016
	device->flags.match_driver = false;
2017 2018
	device->flags.initialized = true;
	device->flags.visited = false;
2019 2020 2021
	device_initialize(&device->dev);
	dev_set_uevent_suppress(&device->dev, true);
}
2022

2023 2024 2025 2026
void acpi_device_add_finalize(struct acpi_device *device)
{
	dev_set_uevent_suppress(&device->dev, false);
	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
L
Linus Torvalds 已提交
2027 2028
}

2029 2030
static int acpi_add_single_object(struct acpi_device **child,
				  acpi_handle handle, int type,
2031
				  unsigned long long sta)
L
Linus Torvalds 已提交
2032
{
2033 2034
	int result;
	struct acpi_device *device;
2035
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
L
Linus Torvalds 已提交
2036

2037
	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
L
Linus Torvalds 已提交
2038
	if (!device) {
2039
		printk(KERN_ERR PREFIX "Memory allocation error\n");
2040
		return -ENOMEM;
L
Linus Torvalds 已提交
2041 2042
	}

2043 2044
	acpi_init_device_object(device, handle, type, sta);
	acpi_bus_get_power_flags(device);
2045
	acpi_bus_get_wakeup_device_flags(device);
L
Linus Torvalds 已提交
2046

2047
	result = acpi_device_add(device, acpi_device_release);
2048
	if (result) {
2049
		acpi_device_release(&device->dev);
2050 2051
		return result;
	}
L
Linus Torvalds 已提交
2052

2053
	acpi_power_add_remove_device(device, true);
2054
	acpi_device_add_finalize(device);
2055 2056 2057 2058 2059 2060 2061
	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;
2062 2063
}

2064 2065
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
				    unsigned long long *sta)
L
Linus Torvalds 已提交
2066
{
2067 2068
	acpi_status status;
	acpi_object_type acpi_type;
L
Linus Torvalds 已提交
2069

2070
	status = acpi_get_type(handle, &acpi_type);
2071
	if (ACPI_FAILURE(status))
2072
		return -ENODEV;
L
Len Brown 已提交
2073

2074
	switch (acpi_type) {
2075 2076
	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
	case ACPI_TYPE_DEVICE:
2077 2078 2079 2080
		*type = ACPI_BUS_TYPE_DEVICE;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
2081 2082
		break;
	case ACPI_TYPE_PROCESSOR:
2083 2084 2085 2086
		*type = ACPI_BUS_TYPE_PROCESSOR;
		status = acpi_bus_get_status_handle(handle, sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
2087 2088
		break;
	case ACPI_TYPE_THERMAL:
2089 2090
		*type = ACPI_BUS_TYPE_THERMAL;
		*sta = ACPI_STA_DEFAULT;
2091 2092
		break;
	case ACPI_TYPE_POWER:
2093 2094
		*type = ACPI_BUS_TYPE_POWER;
		*sta = ACPI_STA_DEFAULT;
2095 2096
		break;
	default:
2097
		return -ENODEV;
2098
	}
L
Linus Torvalds 已提交
2099

2100 2101 2102
	return 0;
}

2103 2104 2105 2106 2107 2108 2109 2110 2111
bool acpi_device_is_present(struct acpi_device *adev)
{
	if (adev->status.present || adev->status.functional)
		return true;

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

2112 2113 2114 2115 2116 2117
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;

2118 2119 2120
	if (handler->match)
		return handler->match(idstr, matchid);

2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131
	for (devid = handler->ids; devid->id[0]; devid++)
		if (!strcmp((char *)devid->id, idstr)) {
			if (matchid)
				*matchid = devid;

			return true;
		}

	return false;
}

2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
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;
}

2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
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);
}

2156
static void acpi_scan_init_hotplug(struct acpi_device *adev)
2157
{
2158
	struct acpi_hardware_id *hwid;
2159

2160
	if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
2161 2162 2163
		acpi_dock_add(adev);
		return;
	}
2164 2165
	list_for_each_entry(hwid, &adev->pnp.ids, list) {
		struct acpi_scan_handler *handler;
2166

2167
		handler = acpi_scan_match_handler(hwid->id, NULL);
2168 2169 2170 2171
		if (handler) {
			adev->flags.hotplug_notify = true;
			break;
		}
2172
	}
2173 2174
}

2175 2176
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
				      void *not_used, void **return_value)
2177
{
2178
	struct acpi_device *device = NULL;
2179 2180 2181 2182
	int type;
	unsigned long long sta;
	int result;

2183 2184 2185 2186
	acpi_bus_get_device(handle, &device);
	if (device)
		goto out;

2187 2188 2189 2190
	result = acpi_bus_type_and_status(handle, &type, &sta);
	if (result)
		return AE_OK;

2191 2192 2193 2194 2195
	if (type == ACPI_BUS_TYPE_POWER) {
		acpi_add_power_resource(handle);
		return AE_OK;
	}

2196
	acpi_add_single_object(&device, handle, type, sta);
2197
	if (!device)
2198
		return AE_CTRL_DEPTH;
L
Linus Torvalds 已提交
2199

2200 2201
	acpi_scan_init_hotplug(device);

2202
 out:
2203 2204
	if (!*return_value)
		*return_value = device;
2205

2206 2207
	return AE_OK;
}
2208

2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
{
	bool *is_spi_i2c_slave_p = data;

	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
		return 1;

	/*
	 * devices that are connected to UART still need to be enumerated to
	 * platform bus
	 */
	if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
		*is_spi_i2c_slave_p = true;

	 /* no need to do more checking */
	return -1;
}

static void acpi_default_enumeration(struct acpi_device *device)
{
	struct list_head resource_list;
	bool is_spi_i2c_slave = false;

	if (!device->pnp.type.platform_id || device->handler)
		return;

	/*
	 * Do not enemerate SPI/I2C slaves as they will be enuerated by their
	 * respective parents.
	 */
	INIT_LIST_HEAD(&resource_list);
	acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
			       &is_spi_i2c_slave);
	acpi_dev_free_resource_list(&resource_list);
	if (!is_spi_i2c_slave)
		acpi_create_platform_device(device);
}

2247
static int acpi_scan_attach_handler(struct acpi_device *device)
2248
{
2249 2250
	struct acpi_hardware_id *hwid;
	int ret = 0;
2251

2252
	list_for_each_entry(hwid, &device->pnp.ids, list) {
2253
		const struct acpi_device_id *devid;
2254
		struct acpi_scan_handler *handler;
2255

2256 2257
		handler = acpi_scan_match_handler(hwid->id, &devid);
		if (handler) {
2258 2259 2260 2261
			if (!handler->attach) {
				device->pnp.type.platform_id = 0;
				continue;
			}
2262
			device->handler = handler;
2263
			ret = handler->attach(device, devid);
2264
			if (ret > 0)
2265
				break;
2266 2267 2268

			device->handler = NULL;
			if (ret < 0)
2269
				break;
2270 2271
		}
	}
2272 2273 2274
	if (!ret)
		acpi_default_enumeration(device);

2275 2276 2277
	return ret;
}

2278
static void acpi_bus_attach(struct acpi_device *device)
2279
{
2280
	struct acpi_device *child;
2281
	acpi_handle ejd;
2282
	int ret;
2283

2284 2285 2286
	if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
		register_dock_dependent_device(device, ejd);

2287
	acpi_bus_get_status(device);
2288
	/* Skip devices that are not present. */
2289 2290 2291 2292
	if (!acpi_device_is_present(device)) {
		device->flags.visited = false;
		return;
	}
2293
	if (device->handler)
2294
		goto ok;
2295

2296 2297 2298 2299
	if (!device->flags.initialized) {
		acpi_bus_update_power(device, NULL);
		device->flags.initialized = true;
	}
2300
	device->flags.visited = false;
2301
	ret = acpi_scan_attach_handler(device);
2302
	if (ret < 0)
2303
		return;
2304 2305

	device->flags.match_driver = true;
2306 2307 2308 2309 2310
	if (!ret) {
		ret = device_attach(&device->dev);
		if (ret < 0)
			return;
	}
2311 2312
	device->flags.visited = true;

2313 2314 2315
 ok:
	list_for_each_entry(child, &device->children, node)
		acpi_bus_attach(child);
2316 2317 2318

	if (device->handler && device->handler->hotplug.notify_online)
		device->handler->hotplug.notify_online(device);
L
Linus Torvalds 已提交
2319 2320
}

2321
/**
2322
 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
2323
 * @handle: Root of the namespace scope to scan.
2324
 *
2325 2326
 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
 * found devices.
2327
 *
2328 2329 2330 2331
 * 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.
2332 2333
 *
 * Must be called under acpi_scan_lock.
2334
 */
2335
int acpi_bus_scan(acpi_handle handle)
2336
{
2337
	void *device = NULL;
2338

2339 2340 2341
	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);
2342

2343 2344 2345
	if (device) {
		acpi_bus_attach(device);
		return 0;
2346
	}
2347
	return -ENODEV;
2348
}
2349
EXPORT_SYMBOL(acpi_bus_scan);
L
Linus Torvalds 已提交
2350

2351
/**
2352 2353
 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
 * @adev: Root of the ACPI namespace scope to walk.
2354 2355 2356
 *
 * Must be called under acpi_scan_lock.
 */
2357
void acpi_bus_trim(struct acpi_device *adev)
L
Linus Torvalds 已提交
2358
{
2359 2360 2361 2362 2363 2364
	struct acpi_scan_handler *handler = adev->handler;
	struct acpi_device *child;

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

2365
	adev->flags.match_driver = false;
2366 2367 2368 2369 2370 2371 2372 2373
	if (handler) {
		if (handler->detach)
			handler->detach(adev);

		adev->handler = NULL;
	} else {
		device_release_driver(&adev->dev);
	}
2374
	/*
2375 2376
	 * Most likely, the device is going away, so put it into D3cold before
	 * that.
2377
	 */
2378 2379 2380
	acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
	adev->flags.initialized = false;
	adev->flags.visited = false;
L
Linus Torvalds 已提交
2381
}
2382 2383
EXPORT_SYMBOL_GPL(acpi_bus_trim);

2384
static int acpi_bus_scan_fixed(void)
L
Linus Torvalds 已提交
2385
{
L
Len Brown 已提交
2386
	int result = 0;
L
Li Shaohua 已提交
2387

L
Linus Torvalds 已提交
2388 2389 2390
	/*
	 * Enumerate all fixed-feature devices.
	 */
2391 2392 2393
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
		struct acpi_device *device = NULL;

2394
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2395
						ACPI_BUS_TYPE_POWER_BUTTON,
2396 2397 2398 2399
						ACPI_STA_DEFAULT);
		if (result)
			return result;

2400
		device->flags.match_driver = true;
2401 2402 2403 2404
		result = device_attach(&device->dev);
		if (result < 0)
			return result;

2405
		device_init_wakeup(&device->dev, true);
2406
	}
L
Linus Torvalds 已提交
2407

2408 2409 2410
	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
		struct acpi_device *device = NULL;

2411
		result = acpi_add_single_object(&device, NULL,
L
Li Shaohua 已提交
2412
						ACPI_BUS_TYPE_SLEEP_BUTTON,
2413 2414 2415 2416
						ACPI_STA_DEFAULT);
		if (result)
			return result;

2417
		device->flags.match_driver = true;
2418
		result = device_attach(&device->dev);
2419
	}
L
Linus Torvalds 已提交
2420

2421
	return result < 0 ? result : 0;
L
Linus Torvalds 已提交
2422 2423
}

2424
int __init acpi_scan_init(void)
L
Linus Torvalds 已提交
2425 2426 2427
{
	int result;

2428 2429 2430 2431 2432 2433
	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");
	}

2434
	acpi_pci_root_init();
2435
	acpi_pci_link_init();
2436
	acpi_processor_init();
2437
	acpi_lpss_init();
2438
	acpi_cmos_rtc_init();
2439
	acpi_container_init();
2440
	acpi_memory_hotplug_init();
2441
	acpi_pnp_init();
2442
	acpi_int340x_thermal_init();
2443

2444
	mutex_lock(&acpi_scan_lock);
L
Linus Torvalds 已提交
2445 2446 2447
	/*
	 * Enumerate devices in the ACPI namespace.
	 */
2448 2449
	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
	if (result)
2450
		goto out;
L
Linus Torvalds 已提交
2451

2452
	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
L
Linus Torvalds 已提交
2453
	if (result)
2454
		goto out;
L
Linus Torvalds 已提交
2455

2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
	/* Fixed feature devices do not exist on HW-reduced platform */
	if (!acpi_gbl_reduced_hardware) {
		result = acpi_bus_scan_fixed();
		if (result) {
			acpi_detach_data(acpi_root->handle,
					 acpi_scan_drop_device);
			acpi_device_del(acpi_root);
			put_device(&acpi_root->dev);
			goto out;
		}
2466
	}
L
Linus Torvalds 已提交
2467

2468
	acpi_update_all_gpes();
2469 2470 2471 2472

 out:
	mutex_unlock(&acpi_scan_lock);
	return result;
L
Linus Torvalds 已提交
2473
}