path: root/drivers/acpi/scan.c

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

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/acpi.h>

#include <acpi/acpi_drivers.h>
#include <acpi/acinterp.h>	/* for acpi_ex_eisa_id_to_string() */

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("scan")
#define STRUCT_TO_INT(s)	(*((int*)&s))
extern struct acpi_device *acpi_root;

#define ACPI_BUS_CLASS			"system_bus"
#define ACPI_BUS_HID			"ACPI_BUS"
#define ACPI_BUS_DRIVER_NAME		"ACPI Bus Driver"
#define ACPI_BUS_DEVICE_NAME		"System Bus"

static LIST_HEAD(acpi_device_list);
DEFINE_SPINLOCK(acpi_device_lock);
LIST_HEAD(acpi_wakeup_device_list);


static void acpi_device_release(struct kobject *kobj)
{
	struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
	kfree(dev->pnp.cid_list);
	kfree(dev);
}

struct acpi_device_attribute {
	struct attribute attr;
	 ssize_t(*show) (struct acpi_device *, char *);
	 ssize_t(*store) (struct acpi_device *, const char *, size_t);
};

typedef void acpi_device_sysfs_files(struct kobject *,
				     const struct attribute *);

static void setup_sys_fs_device_files(struct acpi_device *dev,
				      acpi_device_sysfs_files * func);

#define create_sysfs_device_files(dev)	\
	setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
#define remove_sysfs_device_files(dev)	\
	setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)

#define to_acpi_device(n) container_of(n, struct acpi_device, kobj)
#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);

static ssize_t acpi_device_attr_show(struct kobject *kobj,
				     struct attribute *attr, char *buf)
{
	struct acpi_device *device = to_acpi_device(kobj);
	struct acpi_device_attribute *attribute = to_handle_attr(attr);
	return attribute->show ? attribute->show(device, buf) : -EIO;
}
static ssize_t acpi_device_attr_store(struct kobject *kobj,
				      struct attribute *attr, const char *buf,
				      size_t len)
{
	struct acpi_device *device = to_acpi_device(kobj);
	struct acpi_device_attribute *attribute = to_handle_attr(attr);
	return attribute->store ? attribute->store(device, buf, len) : -EIO;
}

static struct sysfs_ops acpi_device_sysfs_ops = {
	.show = acpi_device_attr_show,
	.store = acpi_device_attr_store,
};

static struct kobj_type ktype_acpi_ns = {
	.sysfs_ops = &acpi_device_sysfs_ops,
	.release = acpi_device_release,
};

static int namespace_uevent(struct kset *kset, struct kobject *kobj,
			     char **envp, int num_envp, char *buffer,
			     int buffer_size)
{
	struct acpi_device *dev = to_acpi_device(kobj);
	int i = 0;
	int len = 0;

	if (!dev->driver)
		return 0;

	if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
			   "PHYSDEVDRIVER=%s", dev->driver->name))
		return -ENOMEM;

	envp[i] = NULL;

	return 0;
}

static struct kset_uevent_ops namespace_uevent_ops = {
	.uevent = &namespace_uevent,
};

static struct kset acpi_namespace_kset = {
	.kobj = {
		 .name = "namespace",
		 },
	.subsys = &acpi_subsys,
	.ktype = &ktype_acpi_ns,
	.uevent_ops = &namespace_uevent_ops,
};

static void acpi_device_register(struct acpi_device *device,
				 struct acpi_device *parent)
{
	int err;

	/*
	 * Linkage
	 * -------
	 * Link this device to its parent and siblings.
	 */
	INIT_LIST_HEAD(&device->children);
	INIT_LIST_HEAD(&device->node);
	INIT_LIST_HEAD(&device->g_list);
	INIT_LIST_HEAD(&device->wakeup_list);

	spin_lock(&acpi_device_lock);
	if (device->parent) {
		list_add_tail(&device->node, &device->parent->children);
		list_add_tail(&device->g_list, &device->parent->g_list);
	} else
		list_add_tail(&device->g_list, &acpi_device_list);
	if (device->wakeup.flags.valid)
		list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
	spin_unlock(&acpi_device_lock);

	strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
	if (parent)
		device->kobj.parent = &parent->kobj;
	device->kobj.ktype = &ktype_acpi_ns;
	device->kobj.kset = &acpi_namespace_kset;
	err = kobject_register(&device->kobj);
	if (err < 0)
		printk(KERN_WARNING "%s: kobject_register error: %d\n",
			__FUNCTION__, err);
	create_sysfs_device_files(device);
}

static void acpi_device_unregister(struct acpi_device *device, int type)
{
	spin_lock(&acpi_device_lock);
	if (device->parent) {
		list_del(&device->node);
		list_del(&device->g_list);
	} else
		list_del(&device->g_list);

	list_del(&device->wakeup_list);

	spin_unlock(&acpi_device_lock);

	acpi_detach_data(device->handle, acpi_bus_data_handler);
	remove_sysfs_device_files(device);
	kobject_unregister(&device->kobj);
}

void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
{

	/* TBD */

	return;
}

static int acpi_bus_get_power_flags(struct acpi_device *device)
{
	acpi_status status = 0;
	acpi_handle handle = NULL;
	u32 i = 0;


	/*
	 * Power Management Flags
	 */
	status = acpi_get_handle(device->handle, "_PSC", &handle);
	if (ACPI_SUCCESS(status))
		device->power.flags.explicit_get = 1;
	status = acpi_get_handle(device->handle, "_IRC", &handle);
	if (ACPI_SUCCESS(status))
		device->power.flags.inrush_current = 1;

	/*
	 * Enumerate supported power management states
	 */
	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
		struct acpi_device_power_state *ps = &device->power.states[i];
		char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };

		/* Evaluate "_PRx" to se if power resources are referenced */
		acpi_evaluate_reference(device->handle, object_name, NULL,
					&ps->resources);
		if (ps->resources.count) {
			device->power.flags.power_resources = 1;
			ps->flags.valid = 1;
		}

		/* Evaluate "_PSx" to see if we can do explicit sets */
		object_name[2] = 'S';
		status = acpi_get_handle(device->handle, object_name, &handle);
		if (ACPI_SUCCESS(status)) {
			ps->flags.explicit_set = 1;
			ps->flags.valid = 1;
		}

		/* State is valid if we have some power control */
		if (ps->resources.count || ps->flags.explicit_set)
			ps->flags.valid = 1;

		ps->power = -1;	/* Unknown - driver assigned */
		ps->latency = -1;	/* Unknown - driver assigned */
	}

	/* Set defaults for D0 and D3 states (always valid) */
	device->power.states[ACPI_STATE_D0].flags.valid = 1;
	device->power.states[ACPI_STATE_D0].power = 100;
	device->power.states[ACPI_STATE_D3].flags.valid = 1;
	device->power.states[ACPI_STATE_D3].power = 0;

	/* TBD: System wake support and resource requirements. */

	device->power.state = ACPI_STATE_UNKNOWN;

	return 0;
}

int acpi_match_ids(struct acpi_device *device, char *ids)
{
	if (device->flags.hardware_id)
		if (strstr(ids, device->pnp.hardware_id))
			return 0;

	if (device->flags.compatible_ids) {
		struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
		int i;

		/* compare multiple _CID entries against driver ids */
		for (i = 0; i < cid_list->count; i++) {
			if (strstr(ids, cid_list->id[i].value))
				return 0;
		}
	}
	return -ENOENT;
}

static acpi_status
acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
					     union acpi_object *package)
{
	int i = 0;
	union acpi_object *element = NULL;

	if (!device || !package || (package->package.count < 2))
		return AE_BAD_PARAMETER;

	element = &(package->package.elements[0]);
	if (!element)
		return AE_BAD_PARAMETER;
	if (element->type == ACPI_TYPE_PACKAGE) {
		if ((element->package.count < 2) ||
		    (element->package.elements[0].type !=
		     ACPI_TYPE_LOCAL_REFERENCE)
		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
			return AE_BAD_DATA;
		device->wakeup.gpe_device =
		    element->package.elements[0].reference.handle;
		device->wakeup.gpe_number =
		    (u32) element->package.elements[1].integer.value;
	} else if (element->type == ACPI_TYPE_INTEGER) {
		device->wakeup.gpe_number = element->integer.value;
	} else
		return AE_BAD_DATA;

	element = &(package->package.elements[1]);
	if (element->type != ACPI_TYPE_INTEGER) {
		return AE_BAD_DATA;
	}
	device->wakeup.sleep_state = element->integer.value;

	if ((package-