* Revision history
* 22.12.1999 0.1 Initial release (split from proc_usb.c)
* 04.01.2000 0.2 Turned into its own filesystem
+ * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
+ * (CAN-2005-3055)
*/
/*****************************************************************************/
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
+#include <linux/cdev.h>
+#include <linux/notifier.h>
+#include <linux/security.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/moduleparam.h>
#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;
+
+/* Mutual exclusion for removal, open, and release */
+DEFINE_MUTEX(usbfs_mutex);
+
struct async {
struct list_head asynclist;
struct dev_state *ps;
- struct task_struct *task;
+ struct pid *pid;
+ uid_t uid, euid;
unsigned int signr;
unsigned int ifnum;
void __user *userbuffer;
void __user *userurb;
struct urb *urb;
+ u32 secid;
};
static int usbfs_snoop = 0;
dev_info( dev , format , ## arg); \
} while (0)
+#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
+
#define MAX_USBFS_BUFFER_SIZE 16384
-static inline int connected (struct usb_device *dev)
+static inline int connected (struct dev_state *ps)
{
- return dev->state != USB_STATE_NOTATTACHED;
+ return (!list_empty(&ps->list) &&
+ ps->dev->state != USB_STATE_NOTATTACHED);
}
static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
- struct dev_state *ps = (struct dev_state *)file->private_data;
+ struct dev_state *ps = file->private_data;
struct usb_device *dev = ps->dev;
ssize_t ret = 0;
unsigned len;
pos = *ppos;
usb_lock_device(dev);
- if (!connected(dev)) {
+ if (!connected(ps)) {
ret = -ENODEV;
goto err;
} else if (pos < 0) {
}
if (pos < sizeof(struct usb_device_descriptor)) {
- struct usb_device_descriptor *desc = kmalloc(sizeof(*desc), GFP_KERNEL);
- if (!desc) {
- ret = -ENOMEM;
- goto err;
- }
- memcpy(desc, &dev->descriptor, sizeof(dev->descriptor));
- le16_to_cpus(&desc->bcdUSB);
- le16_to_cpus(&desc->idVendor);
- le16_to_cpus(&desc->idProduct);
- le16_to_cpus(&desc->bcdDevice);
+ struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
+
+ memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
+ le16_to_cpus(&temp_desc.bcdUSB);
+ le16_to_cpus(&temp_desc.idVendor);
+ le16_to_cpus(&temp_desc.idProduct);
+ le16_to_cpus(&temp_desc.bcdDevice);
len = sizeof(struct usb_device_descriptor) - pos;
if (len > nbytes)
len = nbytes;
- if (copy_to_user(buf, ((char *)desc) + pos, len)) {
- kfree(desc);
+ if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
ret = -EFAULT;
goto err;
}
- kfree(desc);
*ppos += len;
buf += len;
static struct async *alloc_async(unsigned int numisoframes)
{
unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
- struct async *as = kmalloc(assize, GFP_KERNEL);
+ struct async *as = kzalloc(assize, GFP_KERNEL);
+
if (!as)
return NULL;
- memset(as, 0, assize);
as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
if (!as->urb) {
kfree(as);
static void free_async(struct async *as)
{
+ put_pid(as->pid);
kfree(as->urb->transfer_buffer);
kfree(as->urb->setup_packet);
usb_free_urb(as->urb);
return NULL;
}
-static void async_completed(struct urb *urb, struct pt_regs *regs)
+static void snoop_urb(struct urb *urb, void __user *userurb)
+{
+ int j;
+ unsigned char *data = urb->transfer_buffer;
+
+ if (!usbfs_snoop)
+ return;
+
+ if (urb->pipe & USB_DIR_IN)
+ dev_info(&urb->dev->dev, "direction=IN\n");
+ else
+ dev_info(&urb->dev->dev, "direction=OUT\n");
+ dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
+ dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
+ urb->transfer_buffer_length);
+ dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
+ dev_info(&urb->dev->dev, "data: ");
+ for (j = 0; j < urb->transfer_buffer_length; ++j)
+ printk ("%02x ", data[j]);
+ printk("\n");
+}
+
+static void async_completed(struct urb *urb)
{
- struct async *as = (struct async *)urb->context;
+ struct async *as = urb->context;
struct dev_state *ps = as->ps;
struct siginfo sinfo;
sinfo.si_errno = as->urb->status;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
- send_sig_info(as->signr, &sinfo, as->task);
+ kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
+ as->euid, as->secid);
}
- wake_up(&ps->wait);
+ snoop(&urb->dev->dev, "urb complete\n");
+ snoop_urb(urb, as->userurb);
+ wake_up(&ps->wait);
}
static void destroy_async (struct dev_state *ps, struct list_head *list)
}
struct usb_driver usbfs_driver = {
- .owner = THIS_MODULE,
.name = "usbfs",
.probe = driver_probe,
.disconnect = driver_disconnect,
{
int ret = 0;
- if (ps->dev->state != USB_STATE_CONFIGURED)
+ if (ps->dev->state != USB_STATE_ADDRESS
+ && ps->dev->state != USB_STATE_CONFIGURED)
return -EHOSTUNREACH;
if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
return 0;
return ret;
}
+static 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;
+};
+
/*
* file operations
*/
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;
- /*
- * no locking necessary here, as chrdev_open has the kernel lock
- * (still acquire the kernel lock for safety)
- */
+ /* Protect against simultaneous removal or release */
+ mutex_lock(&usbfs_mutex);
+
ret = -ENOMEM;
if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
- goto out_nolock;
+ goto out;
- lock_kernel();
ret = -ENOENT;
- dev = usb_get_dev(inode->u.generic_ip);
- if (!dev) {
- kfree(ps);
+ /* 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->i_private;
+ if (!dev)
goto out;
- }
+ ret = usb_autoresume_device(dev);
+ if (ret)
+ goto out;
+
+ usb_get_dev(dev);
ret = 0;
ps->dev = dev;
ps->file = file;
INIT_LIST_HEAD(&ps->async_completed);
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
- ps->disctask = current;
+ ps->disc_pid = get_pid(task_pid(current));
+ ps->disc_uid = current->uid;
+ ps->disc_euid = current->euid;
ps->disccontext = NULL;
ps->ifclaimed = 0;
+ security_task_getsecid(current, &ps->secid);
wmb();
list_add_tail(&ps->list, &dev->filelist);
file->private_data = ps;
out:
- unlock_kernel();
- out_nolock:
- return ret;
+ if (ret)
+ kfree(ps);
+ mutex_unlock(&usbfs_mutex);
+ return ret;
}
static int usbdev_release(struct inode *inode, struct file *file)
{
- struct dev_state *ps = (struct dev_state *)file->private_data;
+ struct dev_state *ps = file->private_data;
struct usb_device *dev = ps->dev;
unsigned int ifnum;
usb_lock_device(dev);
+
+ /* Protect against simultaneous open */
+ mutex_lock(&usbfs_mutex);
list_del_init(&ps->list);
+ mutex_unlock(&usbfs_mutex);
+
for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
ifnum++) {
if (test_bit(ifnum, &ps->ifclaimed))
releaseintf(ps, ifnum);
}
destroy_all_async(ps);
+ usb_autosuspend_device(dev);
usb_unlock_device(dev);
usb_put_dev(dev);
- ps->dev = NULL;
+ put_pid(ps->disc_pid);
kfree(ps);
- return 0;
+ return 0;
}
static int proc_control(struct dev_state *ps, void __user *arg)
free_page((unsigned long)tbuf);
return -EINVAL;
}
- snoop(&dev->dev, "control read: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
- ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
+ snoop(&dev->dev, "control read: bRequest=%02x "
+ "bRrequestType=%02x wValue=%04x "
+ "wIndex=%04x wLength=%04x\n",
+ ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
+ ctrl.wIndex, ctrl.wLength);
usb_unlock_device(dev);
i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
if ((i > 0) && ctrl.wLength) {
if (usbfs_snoop) {
dev_info(&dev->dev, "control read: data ");
- for (j = 0; j < ctrl.wLength; ++j)
- printk ("%02x ", (unsigned char)(tbuf)[j]);
+ for (j = 0; j < i; ++j)
+ printk("%02x ", (unsigned char)(tbuf)[j]);
printk("\n");
}
- if (copy_to_user(ctrl.data, tbuf, ctrl.wLength)) {
+ if (copy_to_user(ctrl.data, tbuf, i)) {
free_page((unsigned long)tbuf);
return -EFAULT;
}
return -EFAULT;
}
}
- snoop(&dev->dev, "control write: bRequest=%02x bRrequestType=%02x wValue=%04x wIndex=%04x\n",
- ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
+ snoop(&dev->dev, "control write: bRequest=%02x "
+ "bRrequestType=%02x wValue=%04x "
+ "wIndex=%04x wLength=%04x\n",
+ ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
+ ctrl.wIndex, ctrl.wLength);
if (usbfs_snoop) {
dev_info(&dev->dev, "control write: data: ");
for (j = 0; j < ctrl.wLength; ++j)
- printk ("%02x ", (unsigned char)(tbuf)[j]);
+ printk("%02x ", (unsigned char)(tbuf)[j]);
printk("\n");
}
usb_unlock_device(dev);
unsigned int tmo, len1, pipe;
int len2;
unsigned char *tbuf;
- int i, ret;
+ int i, j, ret;
if (copy_from_user(&bulk, arg, sizeof(bulk)))
return -EFAULT;
kfree(tbuf);
return -EINVAL;
}
+ snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
+ bulk.len, bulk.timeout);
usb_unlock_device(dev);
i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
usb_lock_device(dev);
if (!i && len2) {
+ if (usbfs_snoop) {
+ dev_info(&dev->dev, "bulk read: data ");
+ for (j = 0; j < len2; ++j)
+ printk("%02x ", (unsigned char)(tbuf)[j]);
+ printk("\n");
+ }
if (copy_to_user(bulk.data, tbuf, len2)) {
kfree(tbuf);
return -EFAULT;
return -EFAULT;
}
}
+ snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
+ bulk.len, bulk.timeout);
+ if (usbfs_snoop) {
+ dev_info(&dev->dev, "bulk write: data: ");
+ for (j = 0; j < len1; ++j)
+ printk("%02x ", (unsigned char)(tbuf)[j]);
+ printk("\n");
+ }
usb_unlock_device(dev);
i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
usb_lock_device(dev);
static int proc_resetdevice(struct dev_state *ps)
{
- return usb_reset_device(ps->dev);
-
+ return usb_reset_composite_device(ps->dev, NULL);
}
static int proc_setintf(struct dev_state *ps, void __user *arg)
for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
if (usb_interface_claimed(actconfig->interface[i])) {
dev_warn (&ps->dev->dev,
- "usbfs: interface %d claimed "
+ "usbfs: interface %d claimed by %s "
"while '%s' sets config #%d\n",
actconfig->interface[i]
->cur_altsetting
->desc.bInterfaceNumber,
+ actconfig->interface[i]
+ ->dev.driver->name,
current->comm, u);
-#if 0 /* FIXME: enable in 2.6.10 or so */
status = -EBUSY;
break;
-#endif
}
}
}
return status;
}
-
static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
void __user *arg)
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_CONTROL)
return -EINVAL;
- /* min 8 byte setup packet, max arbitrary */
- if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
+ /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
+ if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
return -EINVAL;
if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
return -ENOMEM;
kfree(dr);
return -EFAULT;
}
+ snoop(&ps->dev->dev, "control urb: bRequest=%02x "
+ "bRrequestType=%02x wValue=%04x "
+ "wIndex=%04x wLength=%04x\n",
+ dr->bRequest, dr->bRequestType, dr->wValue,
+ dr->wIndex, dr->wLength);
break;
case USBDEVFS_URB_TYPE_BULK:
return -EINVAL;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
return -EFAULT;
+ snoop(&ps->dev->dev, "bulk urb\n");
break;
case USBDEVFS_URB_TYPE_ISO:
return -EFAULT;
}
for (totlen = u = 0; u < uurb->number_of_packets; u++) {
- if (isopkt[u].length > 1023) {
+ /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
+ if (isopkt[u].length > 8192) {
kfree(isopkt);
return -EINVAL;
}
return -EINVAL;
}
uurb->buffer_length = totlen;
+ snoop(&ps->dev->dev, "iso urb\n");
break;
case USBDEVFS_URB_TYPE_INTERRUPT:
return -EINVAL;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
return -EFAULT;
+ snoop(&ps->dev->dev, "interrupt urb\n");
break;
default:
as->userbuffer = NULL;
as->signr = uurb->signr;
as->ifnum = ifnum;
- as->task = current;
+ as->pid = get_pid(task_pid(current));
+ as->uid = current->uid;
+ as->euid = current->euid;
+ security_task_getsecid(current, &as->secid);
if (!(uurb->endpoint & USB_DIR_IN)) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
free_async(as);
return -EFAULT;
}
}
+ snoop(&as->urb->dev->dev, "submit urb\n");
+ snoop_urb(as->urb, as->userurb);
async_newpending(as);
if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
{
struct usbdevfs_urb uurb;
- if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
+ if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
return -EFAULT;
return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
}
free_async(as);
- if (put_user((u32)(u64)addr, (u32 __user *)arg))
+ if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
return -EFAULT;
return 0;
}
return 0;
}
-static int proc_ioctl (struct dev_state *ps, void __user *arg)
+static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
{
- struct usbdevfs_ioctl ctrl;
int size;
void *buf = NULL;
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)))
- return -EFAULT;
- if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
+ /* alloc buffer */
+ if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
return -ENOMEM;
- if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
- if (copy_from_user (buf, ctrl.data, size)) {
+ if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
+ if (copy_from_user (buf, ctl->data, size)) {
kfree(buf);
return -EFAULT;
}
}
}
- if (!connected(ps->dev)) {
+ if (!connected(ps)) {
kfree(buf);
return -ENODEV;
}
if (ps->dev->state != USB_STATE_CONFIGURED)
retval = -EHOSTUNREACH;
- else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
+ else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
retval = -EINVAL;
- else switch (ctrl.ioctl_code) {
+ else switch (ctl->ioctl_code) {
/* 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);
/* let kernel drivers try to (re)bind to the interface */
case USBDEVFS_CONNECT:
usb_unlock_device(ps->dev);
- usb_lock_all_devices();
- bus_rescan_devices(intf->dev.bus);
- usb_unlock_all_devices();
+ retval = bus_rescan_devices(intf->dev.bus);
usb_lock_device(ps->dev);
break;
if (driver == NULL || driver->ioctl == NULL) {
retval = -ENOTTY;
} else {
- retval = driver->ioctl (intf, ctrl.ioctl_code, buf);
+ retval = driver->ioctl (intf, ctl->ioctl_code, buf);
if (retval == -ENOIOCTLCMD)
retval = -ENOTTY;
}
/* cleanup and return */
if (retval >= 0
- && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
+ && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
&& size > 0
- && copy_to_user (ctrl.data, buf, size) != 0)
+ && copy_to_user (ctl->data, buf, size) != 0)
retval = -EFAULT;
kfree(buf);
return retval;
}
+static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
+{
+ struct usbdevfs_ioctl ctrl;
+
+ if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
+ return -EFAULT;
+ return proc_ioctl(ps, &ctrl);
+}
+
+#ifdef CONFIG_COMPAT
+static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
+{
+ struct usbdevfs_ioctl32 __user *uioc;
+ struct usbdevfs_ioctl ctrl;
+ u32 udata;
+
+ uioc = compat_ptr((long)arg);
+ if (get_user(ctrl.ifno, &uioc->ifno) ||
+ get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
+ __get_user(udata, &uioc->data))
+ return -EFAULT;
+ ctrl.data = compat_ptr(udata);
+
+ return proc_ioctl(ps, &ctrl);
+}
+#endif
+
/*
* NOTE: All requests here that have interface numbers as parameters
* are assuming that somehow the configuration has been prevented from
*/
static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
- struct dev_state *ps = (struct dev_state *)file->private_data;
+ struct dev_state *ps = file->private_data;
struct usb_device *dev = ps->dev;
void __user *p = (void __user *)arg;
int ret = -ENOTTY;
if (!(file->f_mode & FMODE_WRITE))
return -EPERM;
usb_lock_device(dev);
- if (!connected(dev)) {
+ if (!connected(ps)) {
usb_unlock_device(dev);
return -ENODEV;
}
ret = proc_reapurbnonblock_compat(ps, p);
break;
+ case USBDEVFS_IOCTL32:
+ snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
+ ret = proc_ioctl_compat(ps, ptr_to_compat(p));
+ break;
#endif
case USBDEVFS_DISCARDURB:
case USBDEVFS_IOCTL:
snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
- ret = proc_ioctl(ps, p);
+ ret = proc_ioctl_default(ps, p);
break;
}
usb_unlock_device(dev);
/* No kernel lock - fine */
static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
{
- struct dev_state *ps = (struct dev_state *)file->private_data;
- unsigned int mask = 0;
+ struct dev_state *ps = file->private_data;
+ unsigned int mask = 0;
poll_wait(file, &ps->wait, wait);
if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
mask |= POLLOUT | POLLWRNORM;
- if (!connected(ps->dev))
+ if (!connected(ps))
mask |= POLLERR | POLLHUP;
return mask;
}
-struct file_operations usbfs_device_file_operations = {
+const struct file_operations usbfs_device_file_operations = {
.llseek = usbdev_lseek,
.read = usbdev_read,
.poll = usbdev_poll,
.open = usbdev_open,
.release = usbdev_release,
};
+
+static int 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, NULL,
+ MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
+ "usbdev%d.%d", dev->bus->busnum, dev->devnum);
+ if (IS_ERR(dev->class_dev))
+ return PTR_ERR(dev->class_dev);
+
+ dev->class_dev->class_data = dev;
+ return 0;
+}
+
+static void usbdev_remove(struct usb_device *dev)
+{
+ class_device_unregister(dev->class_dev);
+}
+
+static int usbdev_notify(struct notifier_block *self, unsigned long action,
+ void *dev)
+{
+ switch (action) {
+ case USB_DEVICE_ADD:
+ if (usbdev_add(dev))
+ return NOTIFY_BAD;
+ break;
+ case USB_DEVICE_REMOVE:
+ usbdev_remove(dev);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block usbdev_nb = {
+ .notifier_call = usbdev_notify,
+};
+
+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);
+ goto error_cdev;
+ }
+ 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);
+ goto error_class;
+ }
+
+ usb_register_notify(&usbdev_nb);
+
+out:
+ return retval;
+
+error_class:
+ usb_device_class = NULL;
+ cdev_del(&usb_device_cdev);
+
+error_cdev:
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+ goto out;
+}
+
+void usbdev_cleanup(void)
+{
+ usb_unregister_notify(&usbdev_nb);
+ class_destroy(usb_device_class);
+ cdev_del(&usb_device_cdev);
+ unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+}
+
git://git.onelab.eu / linux-2.6.git / blobdiff