devio.c

来自「omap3 linux 2.6 用nocc去除了冗余代码」· C语言 代码 · 共 1,487 行 · 第 1/3 页

	 && 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 int __match_minor(struct device *dev, void *data)
{
	int minor = *((int *)data);

	if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
		return 1;
	return 0;
}

static struct usb_device *usbdev_lookup_by_minor(int minor)
{
	struct device *dev;

	dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
	if (!dev)
		return NULL;
	put_device(dev);
	return container_of(dev, struct usb_device, dev);
}

/*
 * file operations
 */
static int usbdev_open(struct inode *inode, struct file *file)
{
	struct usb_device *dev = NULL;
	struct dev_state *ps;
	int ret;

	/* Protect against simultaneous removal or release */
	mutex_lock(&usbfs_mutex);

	ret = -ENOMEM;
	if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
		goto out;

	ret = -ENOENT;
	/* usbdev device-node */
	if (imajor(inode) == USB_DEVICE_MAJOR)
		dev = usbdev_lookup_by_minor(iminor(inode));
	/* procfs file */
	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;
	spin_lock_init(&ps->lock);
	INIT_LIST_HEAD(&ps->list);
	INIT_LIST_HEAD(&ps->async_pending);
	INIT_LIST_HEAD(&ps->async_completed);
	init_waitqueue_head(&ps->wait);
	ps->discsignr = 0;
	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);
	smp_wmb();
	list_add_tail(&ps->list, &dev->filelist);
	file->private_data = ps;
 out:
	if (ret)
		kfree(ps);
	mutex_unlock(&usbfs_mutex);
	return ret;
}

static int usbdev_release(struct inode *inode, struct file *file)
{
	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);
	put_pid(ps->disc_pid);
	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;
	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);
	}
	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)
{
	int u;
	int status = 0;
 	struct usb_host_config *actconfig;

	if (get_user(u, (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, 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: 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:
		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;
		isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
		if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
			return -ENOMEM;