Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6

This can be broken down into these major areas:
 - Documentation updates (language translations and fixes, as
   well as kobject and kset documenatation updates.)
 - major kset/kobject/ktype rework and fixes.  This cleans up the
   kset and kobject and ktype relationship and architecture,
   making sense of things now, and good documenation and samples
   are provided for others to use.  Also the attributes for
   kobjects are much easier to handle now.  This cleaned up a LOT
   of code all through the kernel, making kobjects easier to use
   if you want to.
 - struct bus_type has been reworked to now handle the lifetime
   rules properly, as the kobject is properly dynamic.
 - struct driver has also been reworked, and now the lifetime
   issues are resolved.
 - the block subsystem has been converted to use struct device
   now, and not "raw" kobjects.  This patch has been in the -mm
   tree for over a year now, and finally all the issues are
   worked out with it.  Older distros now properly work with new
   kernels, and no userspace updates are needed at all.
 - nozomi driver is added.  This has also been in -mm for a long
   time, and many people have asked for it to go in.  It is now
   in good enough shape to do so.
 - lots of class_device conversions to use struct device instead.
   The tree is almost all cleaned up now, only SCSI and IB is the
   remaining code to fix up...

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6: (196 commits)
  Driver core: coding style fixes
  Kobject: fix coding style issues in kobject c files
  Kobject: fix coding style issues in kobject.h
  Driver core: fix coding style issues in device.h
  spi: use class iteration api
  scsi: use class iteration api
  rtc: use class iteration api
  power supply : use class iteration api
  ieee1394: use class iteration api
  Driver Core: add class iteration api
  Driver core: Cleanup get_device_parent() in device_add() and device_move()
  UIO: constify function pointer tables
  Driver Core: constify the name passed to platform_device_register_simple
  driver core: fix build with SYSFS=n
  sysfs: make SYSFS_DEPRECATED depend on SYSFS
  Driver core: use LIST_HEAD instead of call to INIT_LIST_HEAD in __init
  kobject: add sample code for how to use ksets/ktypes/kobjects
  kobject: add sample code for how to use kobjects in a simple manner.
  kobject: update the kobject/kset documentation
  kobject: remove old, outdated documentation.
  ...

1 files changed, 278 insertions, 0 deletions

diff --git a/samples/kobject/kset-example.c b/samples/kobject/kset-example.c
new file mode 100644
index 00000000000..b0a1b4fe658
--- /dev/null
+++ b/samples/kobject/kset-example.c
@@ -0,0 +1,278 @@
+/*
+ * Sample kset and ktype implementation
+ *
+ * Copyright (C) 2004-2007 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2007 Novell Inc.
+ *
+ * Released under the GPL version 2 only.
+ *
+ */
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+/*
+ * This module shows how to create a kset in sysfs called
+ * /sys/kernel/kset-example
+ * Then tree kobjects are created and assigned to this kset, "foo", "baz",
+ * and "bar".  In those kobjects, attributes of the same name are also
+ * created and if an integer is written to these files, it can be later
+ * read out of it.
+ */
+
+
+/*
+ * This is our "object" that we will create a few of and register them with
+ * sysfs.
+ */
+struct foo_obj {
+	struct kobject kobj;
+	int foo;
+	int baz;
+	int bar;
+};
+#define to_foo_obj(x) container_of(x, struct foo_obj, kobj)
+
+/* a custom attribute that works just for a struct foo_obj. */
+struct foo_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct foo_obj *foo, struct foo_attribute *attr, char *buf);
+	ssize_t (*store)(struct foo_obj *foo, struct foo_attribute *attr, const char *buf, size_t count);
+};
+#define to_foo_attr(x) container_of(x, struct foo_attribute, attr)
+
+/*
+ * The default show function that must be passed to sysfs.  This will be
+ * called by sysfs for whenever a show function is called by the user on a
+ * sysfs file associated with the kobjects we have registered.  We need to
+ * transpose back from a "default" kobject to our custom struct foo_obj and
+ * then call the show function for that specific object.
+ */
+static ssize_t foo_attr_show(struct kobject *kobj,
+			     struct attribute *attr,
+			     char *buf)
+{
+	struct foo_attribute *attribute;
+	struct foo_obj *foo;
+
+	attribute = to_foo_attr(attr);
+	foo = to_foo_obj(kobj);
+
+	if (!attribute->show)
+		return -EIO;
+
+	return attribute->show(foo, attribute, buf);
+}
+
+/*
+ * Just like the default show function above, but this one is for when the
+ * sysfs "store" is requested (when a value is written to a file.)
+ */
+static ssize_t foo_attr_store(struct kobject *kobj,
+			      struct attribute *attr,
+			      const char *buf, size_t len)
+{
+	struct foo_attribute *attribute;
+	struct foo_obj *foo;
+
+	attribute = to_foo_attr(attr);
+	foo = to_foo_obj(kobj);
+
+	if (!attribute->store)
+		return -EIO;
+
+	return attribute->store(foo, attribute, buf, len);
+}
+
+/* Our custom sysfs_ops that we will associate with our ktype later on */
+static struct sysfs_ops foo_sysfs_ops = {
+	.show = foo_attr_show,
+	.store = foo_attr_store,
+};
+
+/*
+ * The release function for our object.  This is REQUIRED by the kernel to
+ * have.  We free the memory held in our object here.
+ *
+ * NEVER try to get away with just a "blank" release function to try to be
+ * smarter than the kernel.  Turns out, no one ever is...
+ */
+static void foo_release(struct kobject *kobj)
+{
+	struct foo_obj *foo;
+
+	foo = to_foo_obj(kobj);
+	kfree(foo);
+}
+
+/*
+ * The "foo" file where the .foo variable is read from and written to.
+ */
+static ssize_t foo_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "%d\n", foo_obj->foo);
+}
+
+static ssize_t foo_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
+			 const char *buf, size_t count)
+{
+	sscanf(buf, "%du", &foo_obj->foo);
+	return count;
+}
+
+static struct foo_attribute foo_attribute =
+	__ATTR(foo, 0666, foo_show, foo_store);
+
+/*
+ * More complex function where we determine which varible is being accessed by
+ * looking at the attribute for the "baz" and "bar" files.
+ */
+static ssize_t b_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
+		      char *buf)
+{
+	int var;
+
+	if (strcmp(attr->attr.name, "baz") == 0)
+		var = foo_obj->baz;
+	else
+		var = foo_obj->bar;
+	return sprintf(buf, "%d\n", var);
+}
+
+static ssize_t b_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
+		       const char *buf, size_t count)
+{
+	int var;
+
+	sscanf(buf, "%du", &var);
+	if (strcmp(attr->attr.name, "baz") == 0)
+		foo_obj->baz = var;
+	else
+		foo_obj->bar = var;
+	return count;
+}
+
+static struct foo_attribute baz_attribute =
+	__ATTR(baz, 0666, b_show, b_store);
+static struct foo_attribute bar_attribute =
+	__ATTR(bar, 0666, b_show, b_store);
+
+/*
+ * Create a group of attributes so that we can create and destory them all
+ * at once.
+ */
+static struct attribute *foo_default_attrs[] = {
+	&foo_attribute.attr,
+	&baz_attribute.attr,
+	&bar_attribute.attr,
+	NULL,	/* need to NULL terminate the list of attributes */
+};
+
+/*
+ * Our own ktype for our kobjects.  Here we specify our sysfs ops, the
+ * release function, and the set of default attributes we want created
+ * whenever a kobject of this type is registered with the kernel.
+ */
+static struct kobj_type foo_ktype = {
+	.sysfs_ops = &foo_sysfs_ops,
+	.release = foo_release,
+	.default_attrs = foo_default_attrs,
+};
+
+static struct kset *example_kset;
+static struct foo_obj *foo_obj;
+static struct foo_obj *bar_obj;
+static struct foo_obj *baz_obj;
+
+static struct foo_obj *create_foo_obj(const char *name)
+{
+	struct foo_obj *foo;
+	int retval;
+
+	/* allocate the memory for the whole object */
+	foo = kzalloc(sizeof(*foo), GFP_KERNEL);
+	if (!foo)
+		return NULL;
+
+	/*
+	 * As we have a kset for this kobject, we need to set it before calling
+	 * the kobject core.
+	 */
+	foo->kobj.kset = example_kset;
+
+	/*
+	 * Initialize and add the kobject to the kernel.  All the default files
+	 * will be created here.  As we have already specified a kset for this
+	 * kobject, we don't have to set a parent for the kobject, the kobject
+	 * will be placed beneath that kset automatically.
+	 */
+	retval = kobject_init_and_add(&foo->kobj, &foo_ktype, NULL, "%s", name);
+	if (retval) {
+		kfree(foo);
+		return NULL;
+	}
+
+	/*
+	 * We are always responsible for sending the uevent that the kobject
+	 * was added to the system.
+	 */
+	kobject_uevent(&foo->kobj, KOBJ_ADD);
+
+	return foo;
+}
+
+static void destroy_foo_obj(struct foo_obj *foo)
+{
+	kobject_put(&foo->kobj);
+}
+
+static int example_init(void)
+{
+	/*
+	 * Create a kset with the name of "kset_example",
+	 * located under /sys/kernel/
+	 */
+	example_kset = kset_create_and_add("kset_example", NULL, kernel_kobj);
+	if (!example_kset)
+		return -ENOMEM;
+
+	/*
+	 * Create three objects and register them with our kset
+	 */
+	foo_obj = create_foo_obj("foo");
+	if (!foo_obj)
+		goto foo_error;
+
+	bar_obj = create_foo_obj("bar");
+	if (!bar_obj)
+		goto bar_error;
+
+	baz_obj = create_foo_obj("baz");
+	if (!baz_obj)
+		goto baz_error;
+
+	return 0;
+
+baz_error:
+	destroy_foo_obj(bar_obj);
+bar_error:
+	destroy_foo_obj(foo_obj);
+foo_error:
+	return -EINVAL;
+}
+
+static void example_exit(void)
+{
+	destroy_foo_obj(baz_obj);
+	destroy_foo_obj(bar_obj);
+	destroy_foo_obj(foo_obj);
+	kset_unregister(example_kset);
+}
+
+module_init(example_init);
+module_exit(example_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>");