1 files changed, 528 insertions, 0 deletions
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
new file mode 100644
index 0000000..c98c31e
--- /dev/null
+++ b/drivers/base/sys.c
@@ -0,0 +1,528 @@
+/*
+ * 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/slab.h>
+#include <linux/string.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/mutex.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 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, 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, buffer, count);
+	return -EIO;
+}
+
+static 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)
+{
+	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;
+	kobject_set_name(&cls->kset.kobj, cls->name);
+	return kset_register(&cls->kset);
+}
+
+void sysdev_class_unregister(struct sysdev_class * cls)
+{
+	pr_debug("Unregistering sysdev class '%s'\n",
+		 kobject_name(&cls->kset.kobj));
+	kset_unregister(&cls->kset);
+}
+
+EXPORT_SYMBOL_GPL(sysdev_class_register);
+EXPORT_SYMBOL_GPL(sysdev_class_unregister);
+
+static DEFINE_MUTEX(sysdev_drivers_lock);
+
+/**
+ *	sysdev_driver_register - Register auxillary 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)
+{
+	int err = 0;
+
+	if (!cls) {
+		WARN(1, KERN_WARNING "sysdev: invalid class passed to "
+			"sysdev_driver_register!\n");
+		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) {
+			struct sys_device *dev;
+			list_for_each_entry(dev, &cls->kset.list, kobj.entry)
+				drv->add(dev);
+		}
+	} else {
+		err = -EINVAL;
+		WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
+	}
+	mutex_unlock(&sysdev_drivers_lock);
+	return err;
+}
+
+
+/**
+ *	sysdev_driver_unregister - Remove an auxillary 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);
+	list_del_init(&drv->entry);
+	if (cls) {
+		if (drv->remove) {
+			struct sys_device *dev;
+			list_for_each_entry(dev, &cls->kset.list, kobj.entry)
+				drv->remove(dev);
+		}
+		kset_put(&cls->kset);
+	}
+	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 auxillary 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);
+}
+
+
+
+/**
+ *	sysdev_shutdown - Shut down all system devices.
+ *
+ *	Loop over each class of system devices, and the devices in each
+ *	of those classes. For each device, we call the shutdown method for
+ *	each driver registered for the device - the auxillaries,
+ *	and the class driver.
+ *
+ *	Note: The list is iterated in reverse order, so that we shut down
+ *	child devices before we shut down thier parents. The list ordering
+ *	is guaranteed by virtue of the fact that child devices are registered
+ *	after their parents.
+ */
+
+void sysdev_shutdown(void)
+{
+	struct sysdev_class * cls;
+
+	pr_debug("Shutting Down System Devices\n");
+
+	mutex_lock(&sysdev_drivers_lock);
+	list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) {
+		struct sys_device * sysdev;
+
+		pr_debug("Shutting down type '%s':\n",
+			 kobject_name(&cls->kset.kobj));
+
+		list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
+			struct sysdev_driver * drv;
+			pr_debug(" %s\n", kobject_name(&sysdev->kobj));
+
+			/* Call auxillary drivers first */
+			list_for_each_entry(drv, &cls->drivers, entry) {
+				if (drv->shutdown)
+					drv->shutdown(sysdev);
+			}
+
+			/* Now call the generic one */
+			if (cls->shutdown)
+				cls->shutdown(sysdev);
+		}
+	}
+	mutex_unlock(&sysdev_drivers_lock);
+}
+
+static void __sysdev_resume(struct sys_device *dev)
+{
+	struct sysdev_class *cls = dev->cls;
+	struct sysdev_driver *drv;
+
+	/* First, call the class-specific one */
+	if (cls->resume)
+		cls->resume(dev);
+
+	/* Call auxillary drivers next. */
+	list_for_each_entry(drv, &cls->drivers, entry) {
+		if (drv->resume)
+			drv->resume(dev);
+	}
+}
+
+/**
+ *	sysdev_suspend - Suspend all system devices.
+ *	@state:		Power state to enter.
+ *
+ *	We perform an almost identical operation as sysdev_shutdown()
+ *	above, though calling ->suspend() instead. Interrupts are disabled
+ *	when this called. Devices are responsible for both saving state and
+ *	quiescing or powering down the device.
+ *
+ *	This is only called by the device PM core, so we let them handle
+ *	all synchronization.
+ */
+
+int sysdev_suspend(pm_message_t state)
+{
+	struct sysdev_class * cls;
+	struct sys_device *sysdev, *err_dev;
+	struct sysdev_driver *drv, *err_drv;
+	int ret;
+
+	pr_debug("Suspending System Devices\n");
+
+	list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) {
+		pr_debug("Suspending type '%s':\n",
+			 kobject_name(&cls->kset.kobj));
+
+		list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
+			pr_debug(" %s\n", kobject_name(&sysdev->kobj));
+
+			/* Call auxillary drivers first */
+			list_for_each_entry(drv, &cls->drivers, entry) {
+				if (drv->suspend) {
+					ret = drv->suspend(sysdev, state);
+					if (ret)
+						goto aux_driver;
+				}
+			}
+
+			/* Now call the generic one */
+			if (cls->suspend) {
+				ret = cls->suspend(sysdev, state);
+				if (ret)
+					goto cls_driver;
+			}
+		}
+	}
+	return 0;
+	/* resume current sysdev */
+cls_driver:
+	drv = NULL;
+	printk(KERN_ERR "Class suspend failed for %s\n",
+		kobject_name(&sysdev->kobj));
+
+aux_driver:
+	if (drv)
+		printk(KERN_ERR "Class driver suspend failed for %s\n",
+				kobject_name(&sysdev->kobj));
+	list_for_each_entry(err_drv, &cls->drivers, entry) {
+		if (err_drv == drv)
+			break;
+		if (err_drv->resume)
+			err_drv->resume(sysdev);
+	}
+
+	/* resume other sysdevs in current class */
+	list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
+		if (err_dev == sysdev)
+			break;
+		pr_debug(" %s\n", kobject_name(&err_dev->kobj));
+		__sysdev_resume(err_dev);
+	}
+
+	/* resume other classes */
+	list_for_each_entry_continue(cls, &system_kset->list, kset.kobj.entry) {
+		list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
+			pr_debug(" %s\n", kobject_name(&err_dev->kobj));
+			__sysdev_resume(err_dev);
+		}
+	}
+	return ret;
+}
+
+
+/**
+ *	sysdev_resume - Bring system devices back to life.
+ *
+ *	Similar to sysdev_suspend(), but we iterate the list forwards
+ *	to guarantee that parent devices are resumed before their children.
+ *
+ *	Note: Interrupts are disabled when called.
+ */
+
+int sysdev_resume(void)
+{
+	struct sysdev_class * cls;
+
+	pr_debug("Resuming System Devices\n");
+
+	list_for_each_entry(cls, &system_kset->list, kset.kobj.entry) {
+		struct sys_device * sysdev;
+
+		pr_debug("Resuming type '%s':\n",
+			 kobject_name(&cls->kset.kobj));
+
+		list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
+			pr_debug(" %s\n", kobject_name(&sysdev->kobj));
+
+			__sysdev_resume(sysdev);
+		}
+	}
+	return 0;
+}
+
+
+int __init system_bus_init(void)
+{
+	system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
+	if (!system_kset)
+		return -ENOMEM;
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(sysdev_register);
+EXPORT_SYMBOL_GPL(sysdev_unregister);
+
+#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);
+