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path: root/drivers/usb/core/devio.c
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Diffstat (limited to 'drivers/usb/core/devio.c')
-rw-r--r--drivers/usb/core/devio.c102
1 files changed, 90 insertions, 12 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index f86bf1454e21..b4265aa7d45e 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -43,6 +43,7 @@
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
+#include <linux/cdev.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/moduleparam.h>
@@ -50,6 +51,10 @@
#include "hcd.h" /* for usbcore internals */
#include "usb.h"
+#define USB_MAXBUS 64
+#define USB_DEVICE_MAX USB_MAXBUS * 128
+static struct class *usb_device_class;
+
struct async {
struct list_head asynclist;
struct dev_state *ps;
@@ -71,6 +76,8 @@ MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
dev_info( dev , format , ## arg); \
} while (0)
+#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
+
#define MAX_USBFS_BUFFER_SIZE 16384
@@ -487,7 +494,7 @@ static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsig
*/
static int usbdev_open(struct inode *inode, struct file *file)
{
- struct usb_device *dev;
+ struct usb_device *dev = NULL;
struct dev_state *ps;
int ret;
@@ -501,11 +508,16 @@ static int usbdev_open(struct inode *inode, struct file *file)
lock_kernel();
ret = -ENOENT;
- dev = usb_get_dev(inode->u.generic_ip);
+ /* check if we are called from a real node or usbfs */
+ if (imajor(inode) == USB_DEVICE_MAJOR)
+ dev = usbdev_lookup_minor(iminor(inode));
+ if (!dev)
+ dev = inode->u.generic_ip;
if (!dev) {
kfree(ps);
goto out;
}
+ usb_get_dev(dev);
ret = 0;
ps->dev = dev;
ps->file = file;
@@ -1226,7 +1238,6 @@ static int proc_ioctl (struct dev_state *ps, void __user *arg)
int retval = 0;
struct usb_interface *intf = NULL;
struct usb_driver *driver = NULL;
- int i;
/* get input parameters and alloc buffer */
if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
@@ -1258,15 +1269,6 @@ static int proc_ioctl (struct dev_state *ps, void __user *arg)
/* disconnect kernel driver from interface */
case USBDEVFS_DISCONNECT:
- /* don't allow the user to unbind the hub driver from
- * a hub with children to manage */
- for (i = 0; i < ps->dev->maxchild; ++i) {
- if (ps->dev->children[i])
- retval = -EBUSY;
- }
- if (retval)
- break;
-
down_write(&usb_bus_type.subsys.rwsem);
if (intf->dev.driver) {
driver = to_usb_driver(intf->dev.driver);
@@ -1477,3 +1479,79 @@ struct file_operations usbfs_device_file_operations = {
.open = usbdev_open,
.release = usbdev_release,
};
+
+struct usb_device *usbdev_lookup_minor(int minor)
+{
+ struct class_device *class_dev;
+ struct usb_device *dev = NULL;
+
+ down(&usb_device_class->sem);
+ list_for_each_entry(class_dev, &usb_device_class->children, node) {
+ if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
+ dev = class_dev->class_data;
+ break;
+ }
+ }
+ up(&usb_device_class->sem);
+
+ return dev;
+};
+
+void usbdev_add(struct usb_device *dev)
+{
+ int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
+
+ dev->class_dev = class_device_create(usb_device_class,
+ MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
+ "usbdev%d.%d", dev->bus->busnum, dev->devnum);
+
+ dev->class_dev->class_data = dev;
+}
+
+void usbdev_remove(struct usb_device *dev)
+{
+ class_device_unregister(dev->class_dev);
+}
+
+static struct cdev usb_device_cdev = {
+ .kobj = {.name = "usb_device", },
+ .owner = THIS_MODULE,
+};
+
+int __init usbdev_init(void)
+{
+ int retval;
+
+ retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
+ "usb_device");
+ if (retval) {
+ err("unable to register minors for usb_device");
+ goto out;
+ }
+ cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
+ retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
+ if (retval) {
+ err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+ goto out;
+ }
+ usb_device_class = class_create(THIS_MODULE, "usb_device");
+ if (IS_ERR(usb_device_class)) {
+ err("unable to register usb_device class");
+ retval = PTR_ERR(usb_device_class);
+ usb_device_class = NULL;
+ cdev_del(&usb_device_cdev);
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+ }
+
+out:
+ return retval;
+}
+
+void usbdev_cleanup(void)
+{
+ class_destroy(usb_device_class);
+ cdev_del(&usb_device_cdev);
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+}
+