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