1 files changed, 391 insertions, 0 deletions

diff --git a/drivers/base/sys.c b/drivers/base/sys.c
new file mode 100644
index 00000000000..9dff77bfe1e
--- /dev/null
+++ b/drivers/base/sys.c
@@ -0,0 +1,391 @@
+/*
+ * sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc)
+ *
+ * Copyright (c) 2002-3 Patrick Mochel
+ *               2002-3 Open Source Development Lab
+ *
+ * This file is released under the GPLv2
+ *
+ * This exports a 'system' bus type.
+ * By default, a 'sys' bus gets added to the root of the system. There will
+ * always be core system devices. Devices can use sysdev_register() to
+ * add themselves as children of the system bus.
+ */
+
+#include <linux/sysdev.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+
+#include "base.h"
+
+#define to_sysdev(k) container_of(k, struct sys_device, kobj)
+#define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr)
+
+
+static ssize_t
+sysdev_show(struct kobject *kobj, struct attribute *attr, char *buffer)
+{
+        struct sys_device *sysdev = to_sysdev(kobj);
+        struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
+
+        if (sysdev_attr->show)
+                return sysdev_attr->show(sysdev, sysdev_attr, buffer);
+        return -EIO;
+}
+
+
+static ssize_t
+sysdev_store(struct kobject *kobj, struct attribute *attr,
+             const char *buffer, size_t count)
+{
+        struct sys_device *sysdev = to_sysdev(kobj);
+        struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr);
+
+        if (sysdev_attr->store)
+                return sysdev_attr->store(sysdev, sysdev_attr, buffer, count);
+        return -EIO;
+}
+
+static const struct sysfs_ops sysfs_ops = {
+        .show   = sysdev_show,
+        .store  = sysdev_store,
+};
+
+static struct kobj_type ktype_sysdev = {
+        .sysfs_ops      = &sysfs_ops,
+};
+
+
+int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a)
+{
+        return sysfs_create_file(&s->kobj, &a->attr);
+}
+
+
+void sysdev_remove_file(struct sys_device *s, struct sysdev_attribute *a)
+{
+        sysfs_remove_file(&s->kobj, &a->attr);
+}
+
+EXPORT_SYMBOL_GPL(sysdev_create_file);
+EXPORT_SYMBOL_GPL(sysdev_remove_file);
+
+#define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj)
+#define to_sysdev_class_attr(a) container_of(a, \
+        struct sysdev_class_attribute, attr)
+
+static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr,
+                                 char *buffer)
+{
+        struct sysdev_class *class = to_sysdev_class(kobj);
+        struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
+
+        if (class_attr->show)
+                return class_attr->show(class, class_attr, buffer);
+        return -EIO;
+}
+
+static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr,
+                                  const char *buffer, size_t count)
+{
+        struct sysdev_class *class = to_sysdev_class(kobj);
+        struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr);
+
+        if (class_attr->store)
+                return class_attr->store(class, class_attr, buffer, count);
+        return -EIO;
+}
+
+static const struct sysfs_ops sysfs_class_ops = {
+        .show   = sysdev_class_show,
+        .store  = sysdev_class_store,
+};
+
+static struct kobj_type ktype_sysdev_class = {
+        .sysfs_ops      = &sysfs_class_ops,
+};
+
+int sysdev_class_create_file(struct sysdev_class *c,
+                             struct sysdev_class_attribute *a)
+{
+        return sysfs_create_file(&c->kset.kobj, &a->attr);
+}
+EXPORT_SYMBOL_GPL(sysdev_class_create_file);
+
+void sysdev_class_remove_file(struct sysdev_class *c,
+                              struct sysdev_class_attribute *a)
+{
+        sysfs_remove_file(&c->kset.kobj, &a->attr);
+}
+EXPORT_SYMBOL_GPL(sysdev_class_remove_file);
+
+static struct kset *system_kset;
+
+int sysdev_class_register(struct sysdev_class *cls)
+{
+        int retval;
+
+        pr_debug("Registering sysdev class '%s'\n", cls->name);
+
+        INIT_LIST_HEAD(&cls->drivers);
+        memset(&cls->kset.kobj, 0x00, sizeof(struct kobject));
+        cls->kset.kobj.parent = &system_kset->kobj;
+        cls->kset.kobj.ktype = &ktype_sysdev_class;
+        cls->kset.kobj.kset = system_kset;
+
+        retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name);
+        if (retval)
+                return retval;
+
+        retval = kset_register(&cls->kset);
+        if (!retval && cls->attrs)
+                retval = sysfs_create_files(&cls->kset.kobj,
+                                            (const struct attribute **)cls->attrs);
+        return retval;
+}
+
+void sysdev_class_unregister(struct sysdev_class *cls)
+{
+        pr_debug("Unregistering sysdev class '%s'\n",
+                 kobject_name(&cls->kset.kobj));
+        if (cls->attrs)
+                sysfs_remove_files(&cls->kset.kobj,
+                                   (const struct attribute **)cls->attrs);
+        kset_unregister(&cls->kset);
+}
+
+EXPORT_SYMBOL_GPL(sysdev_class_register);
+EXPORT_SYMBOL_GPL(sysdev_class_unregister);
+
+static DEFINE_MUTEX(sysdev_drivers_lock);
+
+/*
+ * @dev != NULL means that we're unwinding because some drv->add()
+ * failed for some reason. You need to grab sysdev_drivers_lock before
+ * calling this.
+ */
+static void __sysdev_driver_remove(struct sysdev_class *cls,
+                                   struct sysdev_driver *drv,
+                                   struct sys_device *from_dev)
+{
+        struct sys_device *dev = from_dev;
+
+        list_del_init(&drv->entry);
+        if (!cls)
+                return;
+
+        if (!drv->remove)
+                goto kset_put;
+
+        if (dev)
+                list_for_each_entry_continue_reverse(dev, &cls->kset.list,
+                                                     kobj.entry)
+                        drv->remove(dev);
+        else
+                list_for_each_entry(dev, &cls->kset.list, kobj.entry)
+                        drv->remove(dev);
+
+kset_put:
+        kset_put(&cls->kset);
+}
+
+/**
+ *      sysdev_driver_register - Register auxiliary driver
+ *      @cls:   Device class driver belongs to.
+ *      @drv:   Driver.
+ *
+ *      @drv is inserted into @cls->drivers to be
+ *      called on each operation on devices of that class. The refcount
+ *      of @cls is incremented.
+ */
+int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
+{
+        struct sys_device *dev = NULL;
+        int err = 0;
+
+        if (!cls) {
+                WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n",
+                        __func__);
+                return -EINVAL;
+        }
+
+        /* Check whether this driver has already been added to a class. */
+        if (drv->entry.next && !list_empty(&drv->entry))
+                WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already"
+                        " been registered to a class, something is wrong, but "
+                        "will forge on!\n", cls->name, drv);
+
+        mutex_lock(&sysdev_drivers_lock);
+        if (cls && kset_get(&cls->kset)) {
+                list_add_tail(&drv->entry, &cls->drivers);
+
+                /* If devices of this class already exist, tell the driver */
+                if (drv->add) {
+                        list_for_each_entry(dev, &cls->kset.list, kobj.entry) {
+                                err = drv->add(dev);
+                                if (err)
+                                        goto unwind;
+                        }
+                }
+        } else {
+                err = -EINVAL;
+                WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
+        }
+
+        goto unlock;
+
+unwind:
+        __sysdev_driver_remove(cls, drv, dev);
+
+unlock:
+        mutex_unlock(&sysdev_drivers_lock);
+        return err;
+}
+
+/**
+ *      sysdev_driver_unregister - Remove an auxiliary driver.
+ *      @cls:   Class driver belongs to.
+ *      @drv:   Driver.
+ */
+void sysdev_driver_unregister(struct sysdev_class *cls,
+                              struct sysdev_driver *drv)
+{
+        mutex_lock(&sysdev_drivers_lock);
+        __sysdev_driver_remove(cls, drv, NULL);
+        mutex_unlock(&sysdev_drivers_lock);
+}
+EXPORT_SYMBOL_GPL(sysdev_driver_register);
+EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
+
+/**
+ *      sysdev_register - add a system device to the tree
+ *      @sysdev:        device in question
+ *
+ */
+int sysdev_register(struct sys_device *sysdev)
+{
+        int error;
+        struct sysdev_class *cls = sysdev->cls;
+
+        if (!cls)
+                return -EINVAL;
+
+        pr_debug("Registering sys device of class '%s'\n",
+                 kobject_name(&cls->kset.kobj));
+
+        /* initialize the kobject to 0, in case it had previously been used */
+        memset(&sysdev->kobj, 0x00, sizeof(struct kobject));
+
+        /* Make sure the kset is set */
+        sysdev->kobj.kset = &cls->kset;
+
+        /* Register the object */
+        error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL,
+                                     "%s%d", kobject_name(&cls->kset.kobj),
+                                     sysdev->id);
+
+        if (!error) {
+                struct sysdev_driver *drv;
+
+                pr_debug("Registering sys device '%s'\n",
+                         kobject_name(&sysdev->kobj));
+
+                mutex_lock(&sysdev_drivers_lock);
+                /* Generic notification is implicit, because it's that
+                 * code that should have called us.
+                 */
+
+                /* Notify class auxiliary drivers */
+                list_for_each_entry(drv, &cls->drivers, entry) {
+                        if (drv->add)
+                                drv->add(sysdev);
+                }
+                mutex_unlock(&sysdev_drivers_lock);
+                kobject_uevent(&sysdev->kobj, KOBJ_ADD);
+        }
+
+        return error;
+}
+
+void sysdev_unregister(struct sys_device *sysdev)
+{
+        struct sysdev_driver *drv;
+
+        mutex_lock(&sysdev_drivers_lock);
+        list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
+                if (drv->remove)
+                        drv->remove(sysdev);
+        }
+        mutex_unlock(&sysdev_drivers_lock);
+
+        kobject_put(&sysdev->kobj);
+}
+
+EXPORT_SYMBOL_GPL(sysdev_register);
+EXPORT_SYMBOL_GPL(sysdev_unregister);
+
+int __init system_bus_init(void)
+{
+        system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
+        if (!system_kset)
+                return -ENOMEM;
+        return 0;
+}
+
+#define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr)
+
+ssize_t sysdev_store_ulong(struct sys_device *sysdev,
+                           struct sysdev_attribute *attr,
+                           const char *buf, size_t size)
+{
+        struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+        char *end;
+        unsigned long new = simple_strtoul(buf, &end, 0);
+        if (end == buf)
+                return -EINVAL;
+        *(unsigned long *)(ea->var) = new;
+        /* Always return full write size even if we didn't consume all */
+        return size;
+}
+EXPORT_SYMBOL_GPL(sysdev_store_ulong);
+
+ssize_t sysdev_show_ulong(struct sys_device *sysdev,
+                          struct sysdev_attribute *attr,
+                          char *buf)
+{
+        struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+        return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
+}
+EXPORT_SYMBOL_GPL(sysdev_show_ulong);
+
+ssize_t sysdev_store_int(struct sys_device *sysdev,
+                           struct sysdev_attribute *attr,
+                           const char *buf, size_t size)
+{
+        struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+        char *end;
+        long new = simple_strtol(buf, &end, 0);
+        if (end == buf || new > INT_MAX || new < INT_MIN)
+                return -EINVAL;
+        *(int *)(ea->var) = new;
+        /* Always return full write size even if we didn't consume all */
+        return size;
+}
+EXPORT_SYMBOL_GPL(sysdev_store_int);
+
+ssize_t sysdev_show_int(struct sys_device *sysdev,
+                          struct sysdev_attribute *attr,
+                          char *buf)
+{
+        struct sysdev_ext_attribute *ea = to_ext_attr(attr);
+        return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
+}
+EXPORT_SYMBOL_GPL(sysdev_show_int);
+