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linux/drivers/usb/core/devio.c
Greg Kroah-Hartman c182274ffe [PATCH] USB: move usb_device_class class devices to be real devices 
This moves the usb class devices that control the usbfs nodes to show up
in the proper place in the larger device tree.

No userspace changes is needed, this is compatible due to the symlinks
generated by the driver core.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-06-21 15:04:19 -07:00

1663 lines
42 KiB
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/*****************************************************************************/
/*
* devio.c -- User space communication with USB devices.
*
* Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
*
* This file implements the usbfs/x/y files, where
* x is the bus number and y the device number.
*
* It allows user space programs/"drivers" to communicate directly
* with USB devices without intervening kernel driver.
*
* 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/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/signal.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <linux/cdev.h>
#include <linux/notifier.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;
struct async {
struct list_head asynclist;
struct dev_state *ps;
pid_t pid;
uid_t uid, euid;
unsigned int signr;
unsigned int ifnum;
void __user *userbuffer;
void __user *userurb;
struct urb *urb;
};
static int usbfs_snoop = 0;
module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
#define snoop(dev, format, arg...) \
do { \
if (usbfs_snoop) \
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)
{
return dev->state != USB_STATE_NOTATTACHED;
}
static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
{
loff_t ret;
lock_kernel();
switch (orig) {
case 0:
file->f_pos = offset;
ret = file->f_pos;
break;
case 1:
file->f_pos += offset;
ret = file->f_pos;
break;
case 2:
default:
ret = -EINVAL;
}
unlock_kernel();
return ret;
}
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 usb_device *dev = ps->dev;
ssize_t ret = 0;
unsigned len;
loff_t pos;
int i;
pos = *ppos;
usb_lock_device(dev);
if (!connected(dev)) {
ret = -ENODEV;
goto err;
} else if (pos < 0) {
ret = -EINVAL;
goto err;
}
if (pos < sizeof(struct usb_device_descriptor)) {
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 *)&temp_desc) + pos, len)) {
ret = -EFAULT;
goto err;
}
*ppos += len;
buf += len;
nbytes -= len;
ret += len;
}
pos = sizeof(struct usb_device_descriptor);
for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
struct usb_config_descriptor *config =
(struct usb_config_descriptor *)dev->rawdescriptors[i];
unsigned int length = le16_to_cpu(config->wTotalLength);
if (*ppos < pos + length) {
/* The descriptor may claim to be longer than it
* really is. Here is the actual allocated length. */
unsigned alloclen =
le16_to_cpu(dev->config[i].desc.wTotalLength);
len = length - (*ppos - pos);
if (len > nbytes)
len = nbytes;
/* Simply don't write (skip over) unallocated parts */
if (alloclen > (*ppos - pos)) {
alloclen -= (*ppos - pos);
if (copy_to_user(buf,
dev->rawdescriptors[i] + (*ppos - pos),
min(len, alloclen))) {
ret = -EFAULT;
goto err;
}
}
*ppos += len;
buf += len;
nbytes -= len;
ret += len;
}
pos += length;
}
err:
usb_unlock_device(dev);
return ret;
}
/*
* async list handling
*/
static struct async *alloc_async(unsigned int numisoframes)
{
unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
struct async *as = kzalloc(assize, GFP_KERNEL);
if (!as)
return NULL;
as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
if (!as->urb) {
kfree(as);
return NULL;
}
return as;
}
static void free_async(struct async *as)
{
kfree(as->urb->transfer_buffer);
kfree(as->urb->setup_packet);
usb_free_urb(as->urb);
kfree(as);
}
static inline void async_newpending(struct async *as)
{
struct dev_state *ps = as->ps;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
list_add_tail(&as->asynclist, &ps->async_pending);
spin_unlock_irqrestore(&ps->lock, flags);
}
static inline void async_removepending(struct async *as)
{
struct dev_state *ps = as->ps;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
list_del_init(&as->asynclist);
spin_unlock_irqrestore(&ps->lock, flags);
}
static inline struct async *async_getcompleted(struct dev_state *ps)
{
unsigned long flags;
struct async *as = NULL;
spin_lock_irqsave(&ps->lock, flags);
if (!list_empty(&ps->async_completed)) {
as = list_entry(ps->async_completed.next, struct async, asynclist);
list_del_init(&as->asynclist);
}
spin_unlock_irqrestore(&ps->lock, flags);
return as;
}
static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
{
unsigned long flags;
struct async *as;
spin_lock_irqsave(&ps->lock, flags);
list_for_each_entry(as, &ps->async_pending, asynclist)
if (as->userurb == userurb) {
list_del_init(&as->asynclist);
spin_unlock_irqrestore(&ps->lock, flags);
return as;
}
spin_unlock_irqrestore(&ps->lock, flags);
return NULL;
}
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 pt_regs *regs)
{
struct async *as = (struct async *)urb->context;
struct dev_state *ps = as->ps;
struct siginfo sinfo;
spin_lock(&ps->lock);
list_move_tail(&as->asynclist, &ps->async_completed);
spin_unlock(&ps->lock);
if (as->signr) {
sinfo.si_signo = as->signr;
sinfo.si_errno = as->urb->status;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
as->euid);
}
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 async *as;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
while (!list_empty(list)) {
as = list_entry(list->next, struct async, asynclist);
list_del_init(&as->asynclist);
/* drop the spinlock so the completion handler can run */
spin_unlock_irqrestore(&ps->lock, flags);
usb_kill_urb(as->urb);
spin_lock_irqsave(&ps->lock, flags);
}
spin_unlock_irqrestore(&ps->lock, flags);
as = async_getcompleted(ps);
while (as) {
free_async(as);
as = async_getcompleted(ps);
}
}
static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
{
struct list_head *p, *q, hitlist;
unsigned long flags;
INIT_LIST_HEAD(&hitlist);
spin_lock_irqsave(&ps->lock, flags);
list_for_each_safe(p, q, &ps->async_pending)
if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
list_move_tail(p, &hitlist);
spin_unlock_irqrestore(&ps->lock, flags);
destroy_async(ps, &hitlist);
}
static inline void destroy_all_async(struct dev_state *ps)
{
destroy_async(ps, &ps->async_pending);
}
/*
* interface claims are made only at the request of user level code,
* which can also release them (explicitly or by closing files).
* they're also undone when devices disconnect.
*/
static int driver_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
return -ENODEV;
}
static void driver_disconnect(struct usb_interface *intf)
{
struct dev_state *ps = usb_get_intfdata (intf);
unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
if (!ps)
return;
/* NOTE: this relies on usbcore having canceled and completed
* all pending I/O requests; 2.6 does that.
*/
if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
clear_bit(ifnum, &ps->ifclaimed);
else
warn("interface number %u out of range", ifnum);
usb_set_intfdata (intf, NULL);
/* force async requests to complete */
destroy_async_on_interface(ps, ifnum);
}
struct usb_driver usbfs_driver = {
.name = "usbfs",
.probe = driver_probe,
.disconnect = driver_disconnect,
};
static int claimintf(struct dev_state *ps, unsigned int ifnum)
{
struct usb_device *dev = ps->dev;
struct usb_interface *intf;
int err;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return -EINVAL;
/* already claimed */
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
/* lock against other changes to driver bindings */
down_write(&usb_bus_type.subsys.rwsem);
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
else
err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
up_write(&usb_bus_type.subsys.rwsem);
if (err == 0)
set_bit(ifnum, &ps->ifclaimed);
return err;
}
static int releaseintf(struct dev_state *ps, unsigned int ifnum)
{
struct usb_device *dev;
struct usb_interface *intf;
int err;
err = -EINVAL;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return err;
dev = ps->dev;
/* lock against other changes to driver bindings */
down_write(&usb_bus_type.subsys.rwsem);
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
usb_driver_release_interface(&usbfs_driver, intf);
err = 0;
}
up_write(&usb_bus_type.subsys.rwsem);
return err;
}
static int checkintf(struct dev_state *ps, unsigned int ifnum)
{
if (ps->dev->state != USB_STATE_CONFIGURED)
return -EHOSTUNREACH;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return -EINVAL;
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
/* if not yet claimed, claim it for the driver */
dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
current->pid, current->comm, ifnum);
return claimintf(ps, ifnum);
}
static int findintfep(struct usb_device *dev, unsigned int ep)
{
unsigned int i, j, e;
struct usb_interface *intf;
struct usb_host_interface *alts;
struct usb_endpoint_descriptor *endpt;
if (ep & ~(USB_DIR_IN|0xf))
return -EINVAL;
if (!dev->actconfig)
return -ESRCH;
for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
intf = dev->actconfig->interface[i];
for (j = 0; j < intf->num_altsetting; j++) {
alts = &intf->altsetting[j];
for (e = 0; e < alts->desc.bNumEndpoints; e++) {
endpt = &alts->endpoint[e].desc;
if (endpt->bEndpointAddress == ep)
return alts->desc.bInterfaceNumber;
}
}
}
return -ENOENT;
}
static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
{
int ret = 0;
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;
index &= 0xff;
switch (requesttype & USB_RECIP_MASK) {
case USB_RECIP_ENDPOINT:
if ((ret = findintfep(ps->dev, index)) >= 0)
ret = checkintf(ps, ret);
break;
case USB_RECIP_INTERFACE:
ret = checkintf(ps, index);
break;
}
return ret;
}
static struct usb_device *usbdev_lookup_minor(int minor)
{
struct device *device;
struct usb_device *udev = NULL;
down(&usb_device_class->sem);
list_for_each_entry(device, &usb_device_class->devices, node) {
if (device->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
udev = device->platform_data;
break;
}
}
up(&usb_device_class->sem);
return udev;
};
/*
* file operations
*/
static int usbdev_open(struct inode *inode, struct file *file)
{
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)
*/
ret = -ENOMEM;
if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
goto out_nolock;
lock_kernel();
ret = -ENOENT;
/* 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;
spin_lock_init(&ps->lock);
INIT_LIST_HEAD(&ps->async_pending);
INIT_LIST_HEAD(&ps->async_completed);
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disc_pid = current->pid;
ps->disc_uid = current->uid;
ps->disc_euid = current->euid;
ps->disccontext = NULL;
ps->ifclaimed = 0;
wmb();
list_add_tail(&ps->list, &dev->filelist);
file->private_data = ps;
out:
unlock_kernel();
out_nolock:
return ret;
}
static int usbdev_release(struct inode *inode, struct file *file)
{
struct dev_state *ps = (struct dev_state *)file->private_data;
struct usb_device *dev = ps->dev;
unsigned int ifnum;
usb_lock_device(dev);
list_del_init(&ps->list);
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_unlock_device(dev);
usb_put_dev(dev);
ps->dev = NULL;
kfree(ps);
return 0;
}
static int proc_control(struct dev_state *ps, void __user *arg)
{
struct usb_device *dev = ps->dev;
struct usbdevfs_ctrltransfer ctrl;
unsigned int tmo;
unsigned char *tbuf;
int i, j, ret;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
return -EFAULT;
if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
return ret;
if (ctrl.wLength > PAGE_SIZE)
return -EINVAL;
if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
return -ENOMEM;
tmo = ctrl.timeout;
if (ctrl.bRequestType & 0x80) {
if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
free_page((unsigned long)tbuf);
return -EINVAL;
}
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,
ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
usb_lock_device(dev);
if ((i > 0) && ctrl.wLength) {
if (usbfs_snoop) {
dev_info(&dev->dev, "control read: data ");
for (j = 0; j < i; ++j)
printk("%02x ", (unsigned char)(tbuf)[j]);
printk("\n");
}
if (copy_to_user(ctrl.data, tbuf, i)) {
free_page((unsigned long)tbuf);
return -EFAULT;
}
}
} else {
if (ctrl.wLength) {
if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
free_page((unsigned long)tbuf);
return -EFAULT;
}
}
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("\n");
}
usb_unlock_device(dev);
i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
usb_lock_device(dev);
}
free_page((unsigned long)tbuf);
if (i<0 && i != -EPIPE) {
dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
"failed cmd %s rqt %u rq %u len %u ret %d\n",
current->comm, ctrl.bRequestType, ctrl.bRequest,
ctrl.wLength, i);
}
return i;
}
static int proc_bulk(struct dev_state *ps, void __user *arg)
{
struct usb_device *dev = ps->dev;
struct usbdevfs_bulktransfer bulk;
unsigned int tmo, len1, pipe;
int len2;
unsigned char *tbuf;
int i, j, ret;
if (copy_from_user(&bulk, arg, sizeof(bulk)))
return -EFAULT;
if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
return ret;
if ((ret = checkintf(ps, ret)))
return ret;
if (bulk.ep & USB_DIR_IN)
pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
else
pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
return -EINVAL;
len1 = bulk.len;
if (len1 > MAX_USBFS_BUFFER_SIZE)
return -EINVAL;
if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
return -ENOMEM;
tmo = bulk.timeout;
if (bulk.ep & 0x80) {
if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
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;
}
}
} else {
if (len1) {
if (copy_from_user(tbuf, bulk.data, len1)) {
kfree(tbuf);
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);
}
kfree(tbuf);
if (i < 0)
return i;
return len2;
}
static int proc_resetep(struct dev_state *ps, void __user *arg)
{
unsigned int ep;
int ret;
if (get_user(ep, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = findintfep(ps->dev, ep)) < 0)
return ret;
if ((ret = checkintf(ps, ret)))
return ret;
usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
return 0;
}
static int proc_clearhalt(struct dev_state *ps, void __user *arg)
{
unsigned int ep;
int pipe;
int ret;
if (get_user(ep, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = findintfep(ps->dev, ep)) < 0)
return ret;
if ((ret = checkintf(ps, ret)))
return ret;
if (ep & USB_DIR_IN)
pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
else
pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
return usb_clear_halt(ps->dev, pipe);
}
static int proc_getdriver(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_getdriver gd;
struct usb_interface *intf;
int ret;
if (copy_from_user(&gd, arg, sizeof(gd)))
return -EFAULT;
down_read(&usb_bus_type.subsys.rwsem);
intf = usb_ifnum_to_if(ps->dev, gd.interface);
if (!intf || !intf->dev.driver)
ret = -ENODATA;
else {
strncpy(gd.driver, intf->dev.driver->name,
sizeof(gd.driver));
ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
}
up_read(&usb_bus_type.subsys.rwsem);
return ret;
}
static int proc_connectinfo(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_connectinfo ci;
ci.devnum = ps->dev->devnum;
ci.slow = ps->dev->speed == USB_SPEED_LOW;
if (copy_to_user(arg, &ci, sizeof(ci)))
return -EFAULT;
return 0;
}
static int proc_resetdevice(struct dev_state *ps)
{
return usb_reset_composite_device(ps->dev, NULL);
}
static int proc_setintf(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_setinterface setintf;
int ret;
if (copy_from_user(&setintf, arg, sizeof(setintf)))
return -EFAULT;
if ((ret = checkintf(ps, setintf.interface)))
return ret;
return usb_set_interface(ps->dev, setintf.interface,
setintf.altsetting);
}
static int proc_setconfig(struct dev_state *ps, void __user *arg)
{
unsigned int u;
int status = 0;
struct usb_host_config *actconfig;
if (get_user(u, (unsigned int __user *)arg))
return -EFAULT;
actconfig = ps->dev->actconfig;
/* Don't touch the device if any interfaces are claimed.
* It could interfere with other drivers' operations, and if
* an interface is claimed by usbfs it could easily deadlock.
*/
if (actconfig) {
int i;
for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
if (usb_interface_claimed(actconfig->interface[i])) {
dev_warn (&ps->dev->dev,
"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);
status = -EBUSY;
break;
}
}
}
/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
* so avoid usb_set_configuration()'s kick to sysfs
*/
if (status == 0) {
if (actconfig && actconfig->desc.bConfigurationValue == u)
status = usb_reset_configuration(ps->dev);
else
status = usb_set_configuration(ps->dev, u);
}
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)
{
struct usbdevfs_iso_packet_desc *isopkt = NULL;
struct usb_host_endpoint *ep;
struct async *as;
struct usb_ctrlrequest *dr = NULL;
unsigned int u, totlen, isofrmlen;
int ret, interval = 0, ifnum = -1;
if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
URB_NO_FSBR|URB_ZERO_PACKET))
return -EINVAL;
if (!uurb->buffer)
return -EINVAL;
if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
return -EINVAL;
if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
return ifnum;
if ((ret = checkintf(ps, ifnum)))
return ret;
}
if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
else
ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
if (!ep)
return -ENOENT;
switch(uurb->type) {
case USBDEVFS_URB_TYPE_CONTROL:
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_CONTROL)
return -EINVAL;
/* 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;
if (copy_from_user(dr, uurb->buffer, 8)) {
kfree(dr);
return -EFAULT;
}
if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
kfree(dr);
return -EINVAL;
}
if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
kfree(dr);
return ret;
}
uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
uurb->number_of_packets = 0;
uurb->buffer_length = le16_to_cpup(&dr->wLength);
uurb->buffer += 8;
if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
kfree(dr);
return -EFAULT;
}
snoop(&ps->dev->dev, "control urb\n");
break;
case USBDEVFS_URB_TYPE_BULK:
switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_CONTROL:
case USB_ENDPOINT_XFER_ISOC:
return -EINVAL;
/* allow single-shot interrupt transfers, at bogus rates */
}
uurb->number_of_packets = 0;
if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
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:
/* arbitrary limit */
if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
return -EINVAL;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_ISOC)
return -EINVAL;
interval = 1 << min (15, ep->desc.bInterval - 1);
isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
return -ENOMEM;
if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
kfree(isopkt);
return -EFAULT;
}
for (totlen = u = 0; u < uurb->number_of_packets; u++) {
/* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
if (isopkt[u].length > 8192) {
kfree(isopkt);
return -EINVAL;
}
totlen += isopkt[u].length;
}
if (totlen > 32768) {
kfree(isopkt);
return -EINVAL;
}
uurb->buffer_length = totlen;
snoop(&ps->dev->dev, "iso urb\n");
break;
case USBDEVFS_URB_TYPE_INTERRUPT:
uurb->number_of_packets = 0;
if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_INT)
return -EINVAL;
if (ps->dev->speed == USB_SPEED_HIGH)
interval = 1 << min (15, ep->desc.bInterval - 1);
else
interval = ep->desc.bInterval;
if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
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:
return -EINVAL;
}
if (!(as = alloc_async(uurb->number_of_packets))) {
kfree(isopkt);
kfree(dr);
return -ENOMEM;
}
if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
kfree(isopkt);
kfree(dr);
free_async(as);
return -ENOMEM;
}
as->urb->dev = ps->dev;
as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
as->urb->transfer_flags = uurb->flags;
as->urb->transfer_buffer_length = uurb->buffer_length;
as->urb->setup_packet = (unsigned char*)dr;
as->urb->start_frame = uurb->start_frame;
as->urb->number_of_packets = uurb->number_of_packets;
as->urb->interval = interval;
as->urb->context = as;
as->urb->complete = async_completed;
for (totlen = u = 0; u < uurb->number_of_packets; u++) {
as->urb->iso_frame_desc[u].offset = totlen;
as->urb->iso_frame_desc[u].length = isopkt[u].length;
totlen += isopkt[u].length;
}
kfree(isopkt);
as->ps = ps;
as->userurb = arg;
if (uurb->endpoint & USB_DIR_IN)
as->userbuffer = uurb->buffer;
else
as->userbuffer = NULL;
as->signr = uurb->signr;
as->ifnum = ifnum;
as->pid = current->pid;
as->uid = current->uid;
as->euid = current->euid;
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);
async_removepending(as);
free_async(as);
return ret;
}
return 0;
}
static int proc_submiturb(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
if (copy_from_user(&uurb, arg, sizeof(uurb)))
return -EFAULT;
return proc_do_submiturb(ps, &uurb,
(struct usbdevfs_iso_packet_desc __user *)uurb.iso_frame_desc,
arg);
}
static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
{
struct async *as;
as = async_getpending(ps, arg);
if (!as)
return -EINVAL;
usb_kill_urb(as->urb);
return 0;
}
static int processcompl(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
struct usbdevfs_urb __user *userurb = as->userurb;
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer)
if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
return -EFAULT;
if (put_user(urb->status, &userurb->status))
return -EFAULT;
if (put_user(urb->actual_length, &userurb->actual_length))
return -EFAULT;
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;
if (usb_pipeisoc(urb->pipe)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
return -EFAULT;
if (put_user(urb->iso_frame_desc[i].status,
&userurb->iso_frame_desc[i].status))
return -EFAULT;
}
}
free_async(as);
if (put_user(addr, (void __user * __user *)arg))
return -EFAULT;
return 0;
}
static struct async* reap_as(struct dev_state *ps)
{
DECLARE_WAITQUEUE(wait, current);
struct async *as = NULL;
struct usb_device *dev = ps->dev;
add_wait_queue(&ps->wait, &wait);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if ((as = async_getcompleted(ps)))
break;
if (signal_pending(current))
break;
usb_unlock_device(dev);
schedule();
usb_lock_device(dev);
}
remove_wait_queue(&ps->wait, &wait);
set_current_state(TASK_RUNNING);
return as;
}
static int proc_reapurb(struct dev_state *ps, void __user *arg)
{
struct async *as = reap_as(ps);
if (as)
return processcompl(as, (void __user * __user *)arg);
if (signal_pending(current))
return -EINTR;
return -EIO;
}
static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
{
struct async *as;
if (!(as = async_getcompleted(ps)))
return -EAGAIN;
return processcompl(as, (void __user * __user *)arg);
}
#ifdef CONFIG_COMPAT
static int get_urb32(struct usbdevfs_urb *kurb,
struct usbdevfs_urb32 __user *uurb)
{
__u32 uptr;
if (get_user(kurb->type, &uurb->type) ||
__get_user(kurb->endpoint, &uurb->endpoint) ||
__get_user(kurb->status, &uurb->status) ||
__get_user(kurb->flags, &uurb->flags) ||
__get_user(kurb->buffer_length, &uurb->buffer_length) ||
__get_user(kurb->actual_length, &uurb->actual_length) ||
__get_user(kurb->start_frame, &uurb->start_frame) ||
__get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
__get_user(kurb->error_count, &uurb->error_count) ||
__get_user(kurb->signr, &uurb->signr))
return -EFAULT;
if (__get_user(uptr, &uurb->buffer))
return -EFAULT;
kurb->buffer = compat_ptr(uptr);
if (__get_user(uptr, &uurb->buffer))
return -EFAULT;
kurb->usercontext = compat_ptr(uptr);
return 0;
}
static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
return -EFAULT;
return proc_do_submiturb(ps, &uurb,
(struct usbdevfs_iso_packet_desc __user *)uurb.iso_frame_desc,
arg);
}
static int processcompl_compat(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
struct usbdevfs_urb32 __user *userurb = as->userurb;
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer)
if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
return -EFAULT;
if (put_user(urb->status, &userurb->status))
return -EFAULT;
if (put_user(urb->actual_length, &userurb->actual_length))
return -EFAULT;
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;
if (usb_pipeisoc(urb->pipe)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
return -EFAULT;
if (put_user(urb->iso_frame_desc[i].status,
&userurb->iso_frame_desc[i].status))
return -EFAULT;
}
}
free_async(as);
if (put_user((u32)(u64)addr, (u32 __user *)arg))
return -EFAULT;
return 0;
}
static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
{
struct async *as = reap_as(ps);
if (as)
return processcompl_compat(as, (void __user * __user *)arg);
if (signal_pending(current))
return -EINTR;
return -EIO;
}
static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
{
struct async *as;
if (!(as = async_getcompleted(ps)))
return -EAGAIN;
return processcompl_compat(as, (void __user * __user *)arg);
}
#endif
static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_disconnectsignal ds;
if (copy_from_user(&ds, arg, sizeof(ds)))
return -EFAULT;
if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
return -EINVAL;
ps->discsignr = ds.signr;
ps->disccontext = ds.context;
return 0;
}
static int proc_claiminterface(struct dev_state *ps, void __user *arg)
{
unsigned int ifnum;
if (get_user(ifnum, (unsigned int __user *)arg))
return -EFAULT;
return claimintf(ps, ifnum);
}
static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
{
unsigned int ifnum;
int ret;
if (get_user(ifnum, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = releaseintf(ps, ifnum)) < 0)
return ret;
destroy_async_on_interface (ps, ifnum);
return 0;
}
static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
{
int size;
void *buf = NULL;
int retval = 0;
struct usb_interface *intf = NULL;
struct usb_driver *driver = NULL;
/* alloc buffer */
if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
return -ENOMEM;
if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
if (copy_from_user (buf, ctl->data, size)) {
kfree(buf);
return -EFAULT;
}
} else {
memset (buf, 0, size);
}
}
if (!connected(ps->dev)) {
kfree(buf);
return -ENODEV;
}
if (ps->dev->state != USB_STATE_CONFIGURED)
retval = -EHOSTUNREACH;
else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
retval = -EINVAL;
else switch (ctl->ioctl_code) {
/* disconnect kernel driver from interface */
case USBDEVFS_DISCONNECT:
down_write(&usb_bus_type.subsys.rwsem);
if (intf->dev.driver) {
driver = to_usb_driver(intf->dev.driver);
dev_dbg (&intf->dev, "disconnect by usbfs\n");
usb_driver_release_interface(driver, intf);
} else
retval = -ENODATA;
up_write(&usb_bus_type.subsys.rwsem);
break;
/* let kernel drivers try to (re)bind to the interface */
case USBDEVFS_CONNECT:
usb_unlock_device(ps->dev);
bus_rescan_devices(intf->dev.bus);
usb_lock_device(ps->dev);
break;
/* talk directly to the interface's driver */
default:
down_read(&usb_bus_type.subsys.rwsem);
if (intf->dev.driver)
driver = to_usb_driver(intf->dev.driver);
if (driver == NULL || driver->ioctl == NULL) {
retval = -ENOTTY;
} else {
retval = driver->ioctl (intf, ctl->ioctl_code, buf);
if (retval == -ENOIOCTLCMD)
retval = -ENOTTY;
}
up_read(&usb_bus_type.subsys.rwsem);
}
/* cleanup and return */
if (retval >= 0
&& (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
&& 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
* changing. But there's no mechanism to ensure that...
*/
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 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)) {
usb_unlock_device(dev);
return -ENODEV;
}
switch (cmd) {
case USBDEVFS_CONTROL:
snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
ret = proc_control(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_BULK:
snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
ret = proc_bulk(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_RESETEP:
snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
ret = proc_resetep(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_RESET:
snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
ret = proc_resetdevice(ps);
break;
case USBDEVFS_CLEAR_HALT:
snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
ret = proc_clearhalt(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_GETDRIVER:
snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
ret = proc_getdriver(ps, p);
break;
case USBDEVFS_CONNECTINFO:
snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
ret = proc_connectinfo(ps, p);
break;
case USBDEVFS_SETINTERFACE:
snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
ret = proc_setintf(ps, p);
break;
case USBDEVFS_SETCONFIGURATION:
snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
ret = proc_setconfig(ps, p);
break;
case USBDEVFS_SUBMITURB:
snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
ret = proc_submiturb(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
#ifdef CONFIG_COMPAT
case USBDEVFS_SUBMITURB32:
snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
ret = proc_submiturb_compat(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_REAPURB32:
snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
ret = proc_reapurb_compat(ps, p);
break;
case USBDEVFS_REAPURBNDELAY32:
snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
ret = proc_reapurbnonblock_compat(ps, p);
break;
case USBDEVFS_IOCTL32:
snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
break;
#endif
case USBDEVFS_DISCARDURB:
snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
ret = proc_unlinkurb(ps, p);
break;
case USBDEVFS_REAPURB:
snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
ret = proc_reapurb(ps, p);
break;
case USBDEVFS_REAPURBNDELAY:
snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
ret = proc_reapurbnonblock(ps, p);
break;
case USBDEVFS_DISCSIGNAL:
snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
ret = proc_disconnectsignal(ps, p);
break;
case USBDEVFS_CLAIMINTERFACE:
snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
ret = proc_claiminterface(ps, p);
break;
case USBDEVFS_RELEASEINTERFACE:
snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
ret = proc_releaseinterface(ps, p);
break;
case USBDEVFS_IOCTL:
snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
ret = proc_ioctl_default(ps, p);
break;
}
usb_unlock_device(dev);
if (ret >= 0)
inode->i_atime = CURRENT_TIME;
return ret;
}
/* 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;
poll_wait(file, &ps->wait, wait);
if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
mask |= POLLOUT | POLLWRNORM;
if (!connected(ps->dev))
mask |= POLLERR | POLLHUP;
return mask;
}
struct file_operations usbfs_device_file_operations = {
.llseek = usbdev_lseek,
.read = usbdev_read,
.poll = usbdev_poll,
.ioctl = usbdev_ioctl,
.open = usbdev_open,
.release = usbdev_release,
};
static void usbdev_add(struct usb_device *dev)
{
int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
dev->usbfs_dev = device_create(usb_device_class, &dev->dev,
MKDEV(USB_DEVICE_MAJOR, minor),
"usbdev%d.%d", dev->bus->busnum, dev->devnum);
dev->usbfs_dev->platform_data = dev;
}
static void usbdev_remove(struct usb_device *dev)
{
device_unregister(dev->usbfs_dev);
}
static int usbdev_notify(struct notifier_block *self, unsigned long action,
void *dev)
{
switch (action) {
case USB_DEVICE_ADD:
usbdev_add(dev);
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);
}
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