Driver Core: usb: add nodename support for usb drivers.

This adds support for USB drivers to report their requested nodename to
userspace.  It also updates a number of USB drivers to provide the
needed subdirectory and device name to be used for them.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 41 insertions, 1 deletions

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index d2747a49b974..26c09f0257db 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -1057,8 +1057,14 @@ static const struct file_operations usblp_fops = {
         .release =      usblp_release,
 };
 
+static char *usblp_nodename(struct device *dev)
+{
+        return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
+}
+
 static struct usb_class_driver usblp_class = {
         .name =         "lp%d",
+        .nodename =     usblp_nodename,
         .fops =         &usblp_fops,
         .minor_base =   USBLP_MINOR_BASE,
 };
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index 997e659ff693..5cef88929b3e 100644
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -67,6 +67,16 @@ static struct usb_class {
         struct class *class;
 } *usb_class;
 
+static char *usb_nodename(struct device *dev)
+{
+        struct usb_class_driver *drv;
+
+        drv = dev_get_drvdata(dev);
+        if (!drv || !drv->nodename)
+                return NULL;
+        return drv->nodename(dev);
+}
+
 static int init_usb_class(void)
 {
         int result = 0;
@@ -90,6 +100,7 @@ static int init_usb_class(void)
                 kfree(usb_class);
                 usb_class = NULL;
         }
+        usb_class->class->nodename = usb_nodename;
 
 exit:
         return result;
@@ -198,7 +209,7 @@ int usb_register_dev(struct usb_interface *intf,
         else
                 temp = name;
         intf->usb_dev = device_create(usb_class->class, &intf->dev,
-                                      MKDEV(USB_MAJOR, minor), NULL,
+                                      MKDEV(USB_MAJOR, minor), class_driver,
                                       "%s", temp);
         if (IS_ERR(intf->usb_dev)) {
                 down_write(&minor_rwsem);
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 7eee400d3e32..927a27dd2f85 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -305,10 +305,21 @@ static struct dev_pm_ops usb_device_pm_ops = {
 
 #endif  /* CONFIG_PM */
 
+
+static char *usb_nodename(struct device *dev)
+{
+        struct usb_device *usb_dev;
+
+        usb_dev = to_usb_device(dev);
+        return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d",
+                         usb_dev->bus->busnum, usb_dev->devnum);
+}
+
 struct device_type usb_device_type = {
         .name =         "usb_device",
         .release =      usb_release_dev,
         .uevent =       usb_dev_uevent,
+        .nodename =     usb_nodename,
         .pm =           &usb_device_pm_ops,
 };
 
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index a4ef77ef917d..3c5fe5cee05a 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -726,12 +726,18 @@ static const struct file_operations iowarrior_fops = {
         .poll = iowarrior_poll,
 };
 
+static char *iowarrior_nodename(struct device *dev)
+{
+        return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
+}
+
 /*
  * usb class driver info in order to get a minor number from the usb core,
  * and to have the device registered with devfs and the driver core
  */
 static struct usb_class_driver iowarrior_class = {
         .name = "iowarrior%d",
+        .nodename = iowarrior_nodename,
         .fops = &iowarrior_fops,
         .minor_base = IOWARRIOR_MINOR_BASE,
 };
diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index ab0f3226158b..c1e2433f640d 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -266,12 +266,18 @@ static const struct file_operations tower_fops = {
         .llseek =       tower_llseek,
 };
 
+static char *legousbtower_nodename(struct device *dev)
+{
+        return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
+}
+
 /*
  * usb class driver info in order to get a minor number from the usb core,
  * and to have the device registered with the driver core
  */
 static struct usb_class_driver tower_class = {
         .name =         "legousbtower%d",
+        .nodename =     legousbtower_nodename,
         .fops =         &tower_fops,
         .minor_base =   LEGO_USB_TOWER_MINOR_BASE,
 };