1 files changed, 591 insertions, 0 deletions

diff --git a/drivers/base/class.c b/drivers/base/class.c
new file mode 100644
index 000000000000..6bf650fce78c
--- /dev/null
+++ b/drivers/base/class.c
@@ -0,0 +1,591 @@
+/*
+ * class.c - basic device class management
+ *
+ * Copyright (c) 2002-3 Patrick Mochel
+ * Copyright (c) 2002-3 Open Source Development Labs
+ * Copyright (c) 2003-2004 Greg Kroah-Hartman
+ * Copyright (c) 2003-2004 IBM Corp.
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/kdev_t.h>
+#include "base.h"
+
+#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
+#define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
+
+static ssize_t
+class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+	struct class_attribute * class_attr = to_class_attr(attr);
+	struct class * dc = to_class(kobj);
+	ssize_t ret = 0;
+
+	if (class_attr->show)
+		ret = class_attr->show(dc, buf);
+	return ret;
+}
+
+static ssize_t
+class_attr_store(struct kobject * kobj, struct attribute * attr,
+		 const char * buf, size_t count)
+{
+	struct class_attribute * class_attr = to_class_attr(attr);
+	struct class * dc = to_class(kobj);
+	ssize_t ret = 0;
+
+	if (class_attr->store)
+		ret = class_attr->store(dc, buf, count);
+	return ret;
+}
+
+static void class_release(struct kobject * kobj)
+{
+	struct class *class = to_class(kobj);
+
+	pr_debug("class '%s': release.\n", class->name);
+
+	if (class->class_release)
+		class->class_release(class);
+	else
+		pr_debug("class '%s' does not have a release() function, "
+			 "be careful\n", class->name);
+}
+
+static struct sysfs_ops class_sysfs_ops = {
+	.show	= class_attr_show,
+	.store	= class_attr_store,
+};
+
+static struct kobj_type ktype_class = {
+	.sysfs_ops	= &class_sysfs_ops,
+	.release	= class_release,
+};
+
+/* Hotplug events for classes go to the class_obj subsys */
+static decl_subsys(class, &ktype_class, NULL);
+
+
+int class_create_file(struct class * cls, const struct class_attribute * attr)
+{
+	int error;
+	if (cls) {
+		error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr);
+	} else
+		error = -EINVAL;
+	return error;
+}
+
+void class_remove_file(struct class * cls, const struct class_attribute * attr)
+{
+	if (cls)
+		sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr);
+}
+
+struct class * class_get(struct class * cls)
+{
+	if (cls)
+		return container_of(subsys_get(&cls->subsys), struct class, subsys);
+	return NULL;
+}
+
+void class_put(struct class * cls)
+{
+	subsys_put(&cls->subsys);
+}
+
+
+static int add_class_attrs(struct class * cls)
+{
+	int i;
+	int error = 0;
+
+	if (cls->class_attrs) {
+		for (i = 0; attr_name(cls->class_attrs[i]); i++) {
+			error = class_create_file(cls,&cls->class_attrs[i]);
+			if (error)
+				goto Err;
+		}
+	}
+ Done:
+	return error;
+ Err:
+	while (--i >= 0)
+		class_remove_file(cls,&cls->class_attrs[i]);
+	goto Done;
+}
+
+static void remove_class_attrs(struct class * cls)
+{
+	int i;
+
+	if (cls->class_attrs) {
+		for (i = 0; attr_name(cls->class_attrs[i]); i++)
+			class_remove_file(cls,&cls->class_attrs[i]);
+	}
+}
+
+int class_register(struct class * cls)
+{
+	int error;
+
+	pr_debug("device class '%s': registering\n", cls->name);
+
+	INIT_LIST_HEAD(&cls->children);
+	INIT_LIST_HEAD(&cls->interfaces);
+	init_MUTEX(&cls->sem);
+	error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name);
+	if (error)
+		return error;
+
+	subsys_set_kset(cls, class_subsys);
+
+	error = subsystem_register(&cls->subsys);
+	if (!error) {
+		error = add_class_attrs(class_get(cls));
+		class_put(cls);
+	}
+	return error;
+}
+
+void class_unregister(struct class * cls)
+{
+	pr_debug("device class '%s': unregistering\n", cls->name);
+	remove_class_attrs(cls);
+	subsystem_unregister(&cls->subsys);
+}
+
+
+/* Class Device Stuff */
+
+int class_device_create_file(struct class_device * class_dev,
+			     const struct class_device_attribute * attr)
+{
+	int error = -EINVAL;
+	if (class_dev)
+		error = sysfs_create_file(&class_dev->kobj, &attr->attr);
+	return error;
+}
+
+void class_device_remove_file(struct class_device * class_dev,
+			      const struct class_device_attribute * attr)
+{
+	if (class_dev)
+		sysfs_remove_file(&class_dev->kobj, &attr->attr);
+}
+
+int class_device_create_bin_file(struct class_device *class_dev,
+				 struct bin_attribute *attr)
+{
+	int error = -EINVAL;
+	if (class_dev)
+		error = sysfs_create_bin_file(&class_dev->kobj, attr);
+	return error;
+}
+
+void class_device_remove_bin_file(struct class_device *class_dev,
+				  struct bin_attribute *attr)
+{
+	if (class_dev)
+		sysfs_remove_bin_file(&class_dev->kobj, attr);
+}
+
+static ssize_t
+class_device_attr_show(struct kobject * kobj, struct attribute * attr,
+		       char * buf)
+{
+	struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
+	struct class_device * cd = to_class_dev(kobj);
+	ssize_t ret = 0;
+
+	if (class_dev_attr->show)
+		ret = class_dev_attr->show(cd, buf);
+	return ret;
+}
+
+static ssize_t
+class_device_attr_store(struct kobject * kobj, struct attribute * attr,
+			const char * buf, size_t count)
+{
+	struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
+	struct class_device * cd = to_class_dev(kobj);
+	ssize_t ret = 0;
+
+	if (class_dev_attr->store)
+		ret = class_dev_attr->store(cd, buf, count);
+	return ret;
+}
+
+static struct sysfs_ops class_dev_sysfs_ops = {
+	.show	= class_device_attr_show,
+	.store	= class_device_attr_store,
+};
+
+static void class_dev_release(struct kobject * kobj)
+{
+	struct class_device *cd = to_class_dev(kobj);
+	struct class * cls = cd->class;
+
+	pr_debug("device class '%s': release.\n", cd->class_id);
+
+	if (cls->release)
+		cls->release(cd);
+	else {
+		printk(KERN_ERR "Device class '%s' does not have a release() function, "
+			"it is broken and must be fixed.\n",
+			cd->class_id);
+		WARN_ON(1);
+	}
+}
+
+static struct kobj_type ktype_class_device = {
+	.sysfs_ops	= &class_dev_sysfs_ops,
+	.release	= class_dev_release,
+};
+
+static int class_hotplug_filter(struct kset *kset, struct kobject *kobj)
+{
+	struct kobj_type *ktype = get_ktype(kobj);
+
+	if (ktype == &ktype_class_device) {
+		struct class_device *class_dev = to_class_dev(kobj);
+		if (class_dev->class)
+			return 1;
+	}
+	return 0;
+}
+
+static char *class_hotplug_name(struct kset *kset, struct kobject *kobj)
+{
+	struct class_device *class_dev = to_class_dev(kobj);
+
+	return class_dev->class->name;
+}
+
+static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
+			 int num_envp, char *buffer, int buffer_size)
+{
+	struct class_device *class_dev = to_class_dev(kobj);
+	int i = 0;
+	int length = 0;
+	int retval = 0;
+
+	pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
+
+	if (class_dev->dev) {
+		/* add physical device, backing this device  */
+		struct device *dev = class_dev->dev;
+		char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
+
+		add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size,
+				    &length, "PHYSDEVPATH=%s", path);
+		kfree(path);
+
+		if (dev->bus)
+			add_hotplug_env_var(envp, num_envp, &i,
+					    buffer, buffer_size, &length,
+					    "PHYSDEVBUS=%s", dev->bus->name);
+
+		if (dev->driver)
+			add_hotplug_env_var(envp, num_envp, &i,
+					    buffer, buffer_size, &length,
+					    "PHYSDEVDRIVER=%s", dev->driver->name);
+	}
+
+	if (MAJOR(class_dev->devt)) {
+		add_hotplug_env_var(envp, num_envp, &i,
+				    buffer, buffer_size, &length,
+				    "MAJOR=%u", MAJOR(class_dev->devt));
+
+		add_hotplug_env_var(envp, num_envp, &i,
+				    buffer, buffer_size, &length,
+				    "MINOR=%u", MINOR(class_dev->devt));
+	}
+
+	/* terminate, set to next free slot, shrink available space */
+	envp[i] = NULL;
+	envp = &envp[i];
+	num_envp -= i;
+	buffer = &buffer[length];
+	buffer_size -= length;
+
+	if (class_dev->class->hotplug) {
+		/* have the bus specific function add its stuff */
+		retval = class_dev->class->hotplug (class_dev, envp, num_envp,
+						    buffer, buffer_size);
+			if (retval) {
+			pr_debug ("%s - hotplug() returned %d\n",
+				  __FUNCTION__, retval);
+		}
+	}
+
+	return retval;
+}
+
+static struct kset_hotplug_ops class_hotplug_ops = {
+	.filter =	class_hotplug_filter,
+	.name =		class_hotplug_name,
+	.hotplug =	class_hotplug,
+};
+
+static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops);
+
+
+static int class_device_add_attrs(struct class_device * cd)
+{
+	int i;
+	int error = 0;
+	struct class * cls = cd->class;
+
+	if (cls->class_dev_attrs) {
+		for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
+			error = class_device_create_file(cd,
+							 &cls->class_dev_attrs[i]);
+			if (error)
+				goto Err;
+		}
+	}
+ Done:
+	return error;
+ Err:
+	while (--i >= 0)
+		class_device_remove_file(cd,&cls->class_dev_attrs[i]);
+	goto Done;
+}
+
+static void class_device_remove_attrs(struct class_device * cd)
+{
+	int i;
+	struct class * cls = cd->class;
+
+	if (cls->class_dev_attrs) {
+		for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
+			class_device_remove_file(cd,&cls->class_dev_attrs[i]);
+	}
+}
+
+static ssize_t show_dev(struct class_device *class_dev, char *buf)
+{
+	return print_dev_t(buf, class_dev->devt);
+}
+static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
+
+void class_device_initialize(struct class_device *class_dev)
+{
+	kobj_set_kset_s(class_dev, class_obj_subsys);
+	kobject_init(&class_dev->kobj);
+	INIT_LIST_HEAD(&class_dev->node);
+}
+
+int class_device_add(struct class_device *class_dev)
+{
+	struct class * parent = NULL;
+	struct class_interface * class_intf;
+	int error;
+
+	class_dev = class_device_get(class_dev);
+	if (!class_dev)
+		return -EINVAL;
+
+	if (!strlen(class_dev->class_id)) {
+		error = -EINVAL;
+		goto register_done;
+	}
+
+	parent = class_get(class_dev->class);
+
+	pr_debug("CLASS: registering class device: ID = '%s'\n",
+		 class_dev->class_id);
+
+	/* first, register with generic layer. */
+	kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
+	if (parent)
+		class_dev->kobj.parent = &parent->subsys.kset.kobj;
+
+	if ((error = kobject_add(&class_dev->kobj)))
+		goto register_done;
+
+	/* now take care of our own registration */
+	if (parent) {
+		down(&parent->sem);
+		list_add_tail(&class_dev->node, &parent->children);
+		list_for_each_entry(class_intf, &parent->interfaces, node)
+			if (class_intf->add)
+				class_intf->add(class_dev);
+		up(&parent->sem);
+	}
+
+	if (MAJOR(class_dev->devt))
+		class_device_create_file(class_dev, &class_device_attr_dev);
+
+	class_device_add_attrs(class_dev);
+	if (class_dev->dev)
+		sysfs_create_link(&class_dev->kobj,
+				  &class_dev->dev->kobj, "device");
+
+ register_done:
+	if (error && parent)
+		class_put(parent);
+	class_device_put(class_dev);
+	return error;
+}
+
+int class_device_register(struct class_device *class_dev)
+{
+	class_device_initialize(class_dev);
+	return class_device_add(class_dev);
+}
+
+void class_device_del(struct class_device *class_dev)
+{
+	struct class * parent = class_dev->class;
+	struct class_interface * class_intf;
+
+	if (parent) {
+		down(&parent->sem);
+		list_del_init(&class_dev->node);
+		list_for_each_entry(class_intf, &parent->interfaces, node)
+			if (class_intf->remove)
+				class_intf->remove(class_dev);
+		up(&parent->sem);
+	}
+
+	if (class_dev->dev)
+		sysfs_remove_link(&class_dev->kobj, "device");
+	class_device_remove_attrs(class_dev);
+
+	kobject_del(&class_dev->kobj);
+
+	if (parent)
+		class_put(parent);
+}
+
+void class_device_unregister(struct class_device *class_dev)
+{
+	pr_debug("CLASS: Unregistering class device. ID = '%s'\n",
+		 class_dev->class_id);
+	class_device_del(class_dev);
+	class_device_put(class_dev);
+}
+
+int class_device_rename(struct class_device *class_dev, char *new_name)
+{
+	int error = 0;
+
+	class_dev = class_device_get(class_dev);
+	if (!class_dev)
+		return -EINVAL;
+
+	pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,
+		 new_name);
+
+	strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
+
+	error = kobject_rename(&class_dev->kobj, new_name);
+
+	class_device_put(class_dev);
+
+	return error;
+}
+
+struct class_device * class_device_get(struct class_device *class_dev)
+{
+	if (class_dev)
+		return to_class_dev(kobject_get(&class_dev->kobj));
+	return NULL;
+}
+
+void class_device_put(struct class_device *class_dev)
+{
+	kobject_put(&class_dev->kobj);
+}
+
+
+int class_interface_register(struct class_interface *class_intf)
+{
+	struct class *parent;
+	struct class_device *class_dev;
+
+	if (!class_intf || !class_intf->class)
+		return -ENODEV;
+
+	parent = class_get(class_intf->class);
+	if (!parent)
+		return -EINVAL;
+
+	down(&parent->sem);
+	list_add_tail(&class_intf->node, &parent->interfaces);
+	if (class_intf->add) {
+		list_for_each_entry(class_dev, &parent->children, node)
+			class_intf->add(class_dev);
+	}
+	up(&parent->sem);
+
+	return 0;
+}
+
+void class_interface_unregister(struct class_interface *class_intf)
+{
+	struct class * parent = class_intf->class;
+	struct class_device *class_dev;
+
+	if (!parent)
+		return;
+
+	down(&parent->sem);
+	list_del_init(&class_intf->node);
+	if (class_intf->remove) {
+		list_for_each_entry(class_dev, &parent->children, node)
+			class_intf->remove(class_dev);
+	}
+	up(&parent->sem);
+
+	class_put(parent);
+}
+
+
+
+int __init classes_init(void)
+{
+	int retval;
+
+	retval = subsystem_register(&class_subsys);
+	if (retval)
+		return retval;
+
+	/* ick, this is ugly, the things we go through to keep from showing up
+	 * in sysfs... */
+	subsystem_init(&class_obj_subsys);
+	if (!class_obj_subsys.kset.subsys)
+			class_obj_subsys.kset.subsys = &class_obj_subsys;
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(class_create_file);
+EXPORT_SYMBOL_GPL(class_remove_file);
+EXPORT_SYMBOL_GPL(class_register);
+EXPORT_SYMBOL_GPL(class_unregister);
+EXPORT_SYMBOL_GPL(class_get);
+EXPORT_SYMBOL_GPL(class_put);
+
+EXPORT_SYMBOL_GPL(class_device_register);
+EXPORT_SYMBOL_GPL(class_device_unregister);
+EXPORT_SYMBOL_GPL(class_device_initialize);
+EXPORT_SYMBOL_GPL(class_device_add);
+EXPORT_SYMBOL_GPL(class_device_del);
+EXPORT_SYMBOL_GPL(class_device_get);
+EXPORT_SYMBOL_GPL(class_device_put);
+EXPORT_SYMBOL_GPL(class_device_create_file);
+EXPORT_SYMBOL_GPL(class_device_remove_file);
+EXPORT_SYMBOL_GPL(class_device_create_bin_file);
+EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
+
+EXPORT_SYMBOL_GPL(class_interface_register);
+EXPORT_SYMBOL_GPL(class_interface_unregister);