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);