devio.c

优龙2410linux2.6.8内核源代码

					return alts->desc.bInterfaceNumber;
			}
		}
	}
	return -ENOENT; 
}

static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
{
	int ret = 0;

	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;
}

/*
 * file operations
 */
static int usbdev_open(struct inode *inode, struct file *file)
{
	struct usb_device *dev;
	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;
	dev = usb_get_dev(inode->u.generic_ip);
	if (!dev) {
		kfree(ps);
		goto out;
	}
	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->disctask = current;
	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;

	down(&dev->serialize);
	list_del_init(&ps->list);

	if (connected(dev)) {
		for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); ifnum++)
			if (test_bit(ifnum, &ps->ifclaimed))
				releaseintf(ps, ifnum);
		destroy_all_async(ps);
	}
	up(&dev->serialize);
	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 * HZ + 999) / 1000;
	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\n", 
			ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);

		i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
				       ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
		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]);
				printk("\n");
			}
			if (copy_to_user(ctrl.data, tbuf, ctrl.wLength)) {
				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\n", 
			ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, ctrl.wIndex);
		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");
		}
		i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
				       ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
	}
	free_page((unsigned long)tbuf);
	if (i<0) {
		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, 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 (!(tbuf = kmalloc(len1, GFP_KERNEL)))
		return -ENOMEM;
	tmo = (bulk.timeout * HZ + 999) / 1000;
	if (bulk.ep & 0x80) {
		if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
			kfree(tbuf);
			return -EINVAL;
		}
		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
		if (!i && len2) {
			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;
			}
		}
		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
	}
	kfree(tbuf);
	if (i < 0) {
		dev_warn(&dev->dev, "usbfs: USBDEVFS_BULK failed "
			 "ep 0x%x len %u ret %d\n", bulk.ep, bulk.len, i);
		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_device(ps->dev);

}

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 "
					"while '%s' sets config #%d\n",
					actconfig->interface[i]
						->cur_altsetting
						->desc.bInterfaceNumber,
					current->comm, u);
#if 0	/* FIXME:  enable in 2.6.10 or so */
 				status = -EBUSY;
				break;
#endif
			}
 		}
 	}

	/* 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_submiturb(struct dev_state *ps, void __user *arg)
{
	struct usbdevfs_urb uurb;
	struct usbdevfs_iso_packet_desc *isopkt = NULL;
	struct usb_endpoint_descriptor *ep_desc;
	struct async *as;
	struct usb_ctrlrequest *dr = NULL;
	unsigned int u, totlen, isofrmlen;
	int ret, interval = 0, ifnum = -1;

	if (copy_from_user(&uurb, arg, sizeof(uurb)))
		return -EFAULT;
	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;
	}
	switch(uurb.type) {
	case USBDEVFS_URB_TYPE_CONTROL:
		if ((uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) != 0) {
			if (!(ep_desc = usb_epnum_to_ep_desc(ps->dev, uurb.endpoint)))
				return -ENOENT;
			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)
			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;
		}
		break;

	case USBDEVFS_URB_TYPE_BULK:
		uurb.number_of_packets = 0;
		if (uurb.buffer_length > 16384)
			return -EINVAL;
		if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
			return -EFAULT;
		break;

	case USBDEVFS_URB_TYPE_ISO:
		/* arbitrary limit */
		if (uurb.number_of_packets < 1 || uurb.number_of_packets > 128)
			return -EINVAL;
		if (!(ep_desc = usb_epnum_to_ep_desc(ps->dev, uurb.endpoint)))
			return -ENOENT;
		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, &((struct usbdevfs_urb __user *)arg)->iso_frame_desc, isofrmlen)) {
			kfree(isopkt);
			return -EFAULT;
		}
		for (totlen = u = 0; u < uurb.number_of_packets; u++) {
			if (isopkt[u].length > 1023) {
				kfree(isopkt);
				return -EINVAL;
			}