usb: convert endpoint devices to bus-less childs of the usb interface

The endpoint devices look like simple attribute groups now, and no longer
like devices with a specific subsystem. They will also no longer emit uevents.

It also removes the device node requests for endpoint devices, which are not
implemented for now.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 29 insertions, 170 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index c115eed0fdc..77de8d65862 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -154,16 +154,11 @@ static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *in
 static int usb_probe_device(struct device *dev)
 {
         struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
-        struct usb_device *udev;
+        struct usb_device *udev = to_usb_device(dev);
         int error = -ENODEV;
 
         dev_dbg(dev, "%s\n", __func__);
 
-        if (!is_usb_device(dev))        /* Sanity check */
-                return error;
-
-        udev = to_usb_device(dev);
-
         /* TODO: Add real matching code */
 
         /* The device should always appear to be in use
@@ -203,18 +198,13 @@ static void usb_cancel_queued_reset(struct usb_interface *iface)
 static int usb_probe_interface(struct device *dev)
 {
         struct usb_driver *driver = to_usb_driver(dev->driver);
-        struct usb_interface *intf;
-        struct usb_device *udev;
+        struct usb_interface *intf = to_usb_interface(dev);
+        struct usb_device *udev = interface_to_usbdev(intf);
         const struct usb_device_id *id;
         int error = -ENODEV;
 
         dev_dbg(dev, "%s\n", __func__);
 
-        if (is_usb_device(dev))         /* Sanity check */
-                return error;
-
-        intf = to_usb_interface(dev);
-        udev = interface_to_usbdev(intf);
         intf->needs_binding = 0;
 
         if (udev->authorized == 0) {
@@ -593,7 +583,7 @@ static int usb_device_match(struct device *dev, struct device_driver *drv)
                 /* TODO: Add real matching code */
                 return 1;
 
-        } else {
+        } else if (is_usb_interface(dev)) {
                 struct usb_interface *intf;
                 struct usb_driver *usb_drv;
                 const struct usb_device_id *id;
@@ -625,11 +615,14 @@ static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
         /* driver is often null here; dev_dbg() would oops */
         pr_debug("usb %s: uevent\n", dev_name(dev));
 
-        if (is_usb_device(dev))
+        if (is_usb_device(dev)) {
                 usb_dev = to_usb_device(dev);
-        else {
+        } else if (is_usb_interface(dev)) {
                 struct usb_interface *intf = to_usb_interface(dev);
+
                 usb_dev = interface_to_usbdev(intf);
+        } else {
+                return 0;
         }
 
         if (usb_dev->devnum < 0) {
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index 40dee2ac013..bc39fc40bbd 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -15,19 +15,18 @@
 #include <linux/usb.h>
 #include "usb.h"
 
-#define MAX_ENDPOINT_MINORS (64*128*32)
-static int usb_endpoint_major;
-static DEFINE_IDR(endpoint_idr);
-
 struct ep_device {
         struct usb_endpoint_descriptor *desc;
         struct usb_device *udev;
         struct device dev;
-        int minor;
 };
 #define to_ep_device(_dev) \
         container_of(_dev, struct ep_device, dev)
 
+struct device_type usb_ep_device_type = {
+        .name =         "usb_endpoint",
+};
+
 struct ep_attribute {
         struct attribute attr;
         ssize_t (*show)(struct usb_device *,
@@ -160,118 +159,10 @@ static struct attribute_group *ep_dev_groups[] = {
         NULL
 };
 
-static int usb_endpoint_major_init(void)
-{
-        dev_t dev;
-        int error;
-
-        error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
-                                    "usb_endpoint");
-        if (error) {
-                printk(KERN_ERR "Unable to get a dynamic major for "
-                       "usb endpoints.\n");
-                return error;
-        }
-        usb_endpoint_major = MAJOR(dev);
-
-        return error;
-}
-
-static void usb_endpoint_major_cleanup(void)
-{
-        unregister_chrdev_region(MKDEV(usb_endpoint_major, 0),
-                                 MAX_ENDPOINT_MINORS);
-}
-
-static int endpoint_get_minor(struct ep_device *ep_dev)
-{
-        static DEFINE_MUTEX(minor_lock);
-        int retval = -ENOMEM;
-        int id;
-
-        mutex_lock(&minor_lock);
-        if (idr_pre_get(&endpoint_idr, GFP_KERNEL) == 0)
-                goto exit;
-
-        retval = idr_get_new(&endpoint_idr, ep_dev, &id);
-        if (retval < 0) {
-                if (retval == -EAGAIN)
-                        retval = -ENOMEM;
-                goto exit;
-        }
-        ep_dev->minor = id & MAX_ID_MASK;
-exit:
-        mutex_unlock(&minor_lock);
-        return retval;
-}
-
-static void endpoint_free_minor(struct ep_device *ep_dev)
-{
-        idr_remove(&endpoint_idr, ep_dev->minor);
-}
-
-static struct endpoint_class {
-        struct kref kref;
-        struct class *class;
-} *ep_class;
-
-static int init_endpoint_class(void)
-{
-        int result = 0;
-
-        if (ep_class != NULL) {
-                kref_get(&ep_class->kref);
-                goto exit;
-        }
-
-        ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
-        if (!ep_class) {
-                result = -ENOMEM;
-                goto exit;
-        }
-
-        kref_init(&ep_class->kref);
-        ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
-        if (IS_ERR(ep_class->class)) {
-                result = PTR_ERR(ep_class->class);
-                goto class_create_error;
-        }
-
-        result = usb_endpoint_major_init();
-        if (result)
-                goto endpoint_major_error;
-
-        goto exit;
-
-endpoint_major_error:
-        class_destroy(ep_class->class);
-class_create_error:
-        kfree(ep_class);
-        ep_class = NULL;
-exit:
-        return result;
-}
-
-static void release_endpoint_class(struct kref *kref)
-{
-        /* Ok, we cheat as we know we only have one ep_class */
-        class_destroy(ep_class->class);
-        kfree(ep_class);
-        ep_class = NULL;
-        usb_endpoint_major_cleanup();
-}
-
-static void destroy_endpoint_class(void)
-{
-        if (ep_class)
-                kref_put(&ep_class->kref, release_endpoint_class);
-}
-
 static void ep_device_release(struct device *dev)
 {
         struct ep_device *ep_dev = to_ep_device(dev);
 
-        endpoint_free_minor(ep_dev);
         kfree(ep_dev);
 }
 
@@ -279,62 +170,32 @@ int usb_create_ep_devs(struct device *parent,
                         struct usb_host_endpoint *endpoint,
                         struct usb_device *udev)
 {
-        char name[8];
         struct ep_device *ep_dev;
         int retval;
 
-        retval = init_endpoint_class();
-        if (retval)
-                goto exit;
-
         ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
         if (!ep_dev) {
                 retval = -ENOMEM;
-                goto error_alloc;
-        }
-
-        retval = endpoint_get_minor(ep_dev);
-        if (retval) {
-                dev_err(parent, "can not allocate minor number for %s\n",
-                        dev_name(&ep_dev->dev));
-                goto error_register;
+                goto exit;
         }
 
         ep_dev->desc = &endpoint->desc;
         ep_dev->udev = udev;
         ep_dev->dev.groups = ep_dev_groups;
-        ep_dev->dev.devt = MKDEV(usb_endpoint_major, ep_dev->minor);
-        ep_dev->dev.class = ep_class->class;
+        ep_dev->dev.type = &usb_ep_device_type;
         ep_dev->dev.parent = parent;
         ep_dev->dev.release = ep_device_release;
-        dev_set_name(&ep_dev->dev, "usbdev%d.%d_ep%02x",
-                 udev->bus->busnum, udev->devnum,
-                 endpoint->desc.bEndpointAddress);
+        dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
 
         retval = device_register(&ep_dev->dev);
         if (retval)
-                goto error_chrdev;
+                goto error_register;
 
-        /* create the symlink to the old-style "ep_XX" directory */
-        sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
-        retval = sysfs_create_link(&parent->kobj, &ep_dev->dev.kobj, name);
-        if (retval)
-                goto error_link;
         endpoint->ep_dev = ep_dev;
         return retval;
 
-error_link:
-        device_unregister(&ep_dev->dev);
-        destroy_endpoint_class();
-        return retval;
-
-error_chrdev:
-        endpoint_free_minor(ep_dev);
-
 error_register:
         kfree(ep_dev);
-error_alloc:
-        destroy_endpoint_class();
 exit:
         return retval;
 }
@@ -344,12 +205,7 @@ void usb_remove_ep_devs(struct usb_host_endpoint *endpoint)
         struct ep_device *ep_dev = endpoint->ep_dev;
 
         if (ep_dev) {
-                char name[8];
-
-                sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
-                sysfs_remove_link(&ep_dev->dev.parent->kobj, name);
                 device_unregister(&ep_dev->dev);
                 endpoint->ep_dev = NULL;
-                destroy_endpoint_class();
         }
 }
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index eb810bbe7bb..c32811ae128 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -140,8 +140,7 @@ static int __find_interface(struct device *dev, void *data)
         struct find_interface_arg *arg = data;
         struct usb_interface *intf;
 
-        /* can't look at usb devices, only interfaces */
-        if (is_usb_device(dev))
+        if (!is_usb_interface(dev))
                 return 0;
 
         intf = to_usb_interface(dev);
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index dabf9255a10..e2a8cfaade1 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -104,6 +104,7 @@ extern struct workqueue_struct *ksuspend_usb_wq;
 extern struct bus_type usb_bus_type;
 extern struct device_type usb_device_type;
 extern struct device_type usb_if_device_type;
+extern struct device_type usb_ep_device_type;
 extern struct usb_device_driver usb_generic_driver;
 
 static inline int is_usb_device(const struct device *dev)
@@ -111,6 +112,16 @@ static inline int is_usb_device(const struct device *dev)
         return dev->type == &usb_device_type;
 }
 
+static inline int is_usb_interface(const struct device *dev)
+{
+        return dev->type == &usb_if_device_type;
+}
+
+static inline int is_usb_endpoint(const struct device *dev)
+{
+        return dev->type == &usb_ep_device_type;
+}
+
 /* Do the same for device drivers and interface drivers. */
 
 static inline int is_usb_device_driver(struct device_driver *drv)