Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2089 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
new file mode 100644
index 000000000..2a7eea4e2
--- /dev/null
+++ b/drivers/usb/class/cdc-acm.c
@@ -0,0 +1,2089 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * cdc-acm.c
+ *
+ * Copyright (c) 1999 Armin Fuerst	<fuerst@in.tum.de>
+ * Copyright (c) 1999 Pavel Machek	<pavel@ucw.cz>
+ * Copyright (c) 1999 Johannes Erdfelt	<johannes@erdfelt.com>
+ * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
+ * Copyright (c) 2004 Oliver Neukum	<oliver@neukum.name>
+ * Copyright (c) 2005 David Kubicek	<dave@awk.cz>
+ * Copyright (c) 2011 Johan Hovold	<jhovold@gmail.com>
+ *
+ * USB Abstract Control Model driver for USB modems and ISDN adapters
+ *
+ * Sponsored by SuSE
+ */
+
+#undef DEBUG
+#undef VERBOSE_DEBUG
+
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/log2.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+#include <linux/idr.h>
+#include <linux/list.h>
+
+#include "cdc-acm.h"
+
+
+#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"
+#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
+
+static struct usb_driver acm_driver;
+static struct tty_driver *acm_tty_driver;
+
+static DEFINE_IDR(acm_minors);
+static DEFINE_MUTEX(acm_minors_lock);
+
+static void acm_tty_set_termios(struct tty_struct *tty,
+				const struct ktermios *termios_old);
+
+/*
+ * acm_minors accessors
+ */
+
+/*
+ * Look up an ACM structure by minor. If found and not disconnected, increment
+ * its refcount and return it with its mutex held.
+ */
+static struct acm *acm_get_by_minor(unsigned int minor)
+{
+	struct acm *acm;
+
+	mutex_lock(&acm_minors_lock);
+	acm = idr_find(&acm_minors, minor);
+	if (acm) {
+		mutex_lock(&acm->mutex);
+		if (acm->disconnected) {
+			mutex_unlock(&acm->mutex);
+			acm = NULL;
+		} else {
+			tty_port_get(&acm->port);
+			mutex_unlock(&acm->mutex);
+		}
+	}
+	mutex_unlock(&acm_minors_lock);
+	return acm;
+}
+
+/*
+ * Try to find an available minor number and if found, associate it with 'acm'.
+ */
+static int acm_alloc_minor(struct acm *acm)
+{
+	int minor;
+
+	mutex_lock(&acm_minors_lock);
+	minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
+	mutex_unlock(&acm_minors_lock);
+
+	return minor;
+}
+
+/* Release the minor number associated with 'acm'.  */
+static void acm_release_minor(struct acm *acm)
+{
+	mutex_lock(&acm_minors_lock);
+	idr_remove(&acm_minors, acm->minor);
+	mutex_unlock(&acm_minors_lock);
+}
+
+/*
+ * Functions for ACM control messages.
+ */
+
+static int acm_ctrl_msg(struct acm *acm, int request, int value,
+							void *buf, int len)
+{
+	int retval;
+
+	retval = usb_autopm_get_interface(acm->control);
+	if (retval)
+		return retval;
+
+	retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
+		request, USB_RT_ACM, value,
+		acm->control->altsetting[0].desc.bInterfaceNumber,
+		buf, len, USB_CTRL_SET_TIMEOUT);
+
+	dev_dbg(&acm->control->dev,
+		"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
+		__func__, request, value, len, retval);
+
+	usb_autopm_put_interface(acm->control);
+
+	return retval < 0 ? retval : 0;
+}
+
+/* devices aren't required to support these requests.
+ * the cdc acm descriptor tells whether they do...
+ */
+static inline int acm_set_control(struct acm *acm, int control)
+{
+	if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
+		return -EOPNOTSUPP;
+
+	return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
+			control, NULL, 0);
+}
+
+#define acm_set_line(acm, line) \
+	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
+#define acm_send_break(acm, ms) \
+	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
+
+static void acm_poison_urbs(struct acm *acm)
+{
+	int i;
+
+	usb_poison_urb(acm->ctrlurb);
+	for (i = 0; i < ACM_NW; i++)
+		usb_poison_urb(acm->wb[i].urb);
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_poison_urb(acm->read_urbs[i]);
+}
+
+static void acm_unpoison_urbs(struct acm *acm)
+{
+	int i;
+
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_unpoison_urb(acm->read_urbs[i]);
+	for (i = 0; i < ACM_NW; i++)
+		usb_unpoison_urb(acm->wb[i].urb);
+	usb_unpoison_urb(acm->ctrlurb);
+}
+
+
+/*
+ * Write buffer management.
+ * All of these assume proper locks taken by the caller.
+ */
+
+static int acm_wb_alloc(struct acm *acm)
+{
+	int i, wbn;
+	struct acm_wb *wb;
+
+	wbn = 0;
+	i = 0;
+	for (;;) {
+		wb = &acm->wb[wbn];
+		if (!wb->use) {
+			wb->use = true;
+			wb->len = 0;
+			return wbn;
+		}
+		wbn = (wbn + 1) % ACM_NW;
+		if (++i >= ACM_NW)
+			return -1;
+	}
+}
+
+static int acm_wb_is_avail(struct acm *acm)
+{
+	int i, n;
+	unsigned long flags;
+
+	n = ACM_NW;
+	spin_lock_irqsave(&acm->write_lock, flags);
+	for (i = 0; i < ACM_NW; i++)
+		if(acm->wb[i].use)
+			n--;
+	spin_unlock_irqrestore(&acm->write_lock, flags);
+	return n;
+}
+
+/*
+ * Finish write. Caller must hold acm->write_lock
+ */
+static void acm_write_done(struct acm *acm, struct acm_wb *wb)
+{
+	wb->use = false;
+	acm->transmitting--;
+	usb_autopm_put_interface_async(acm->control);
+}
+
+/*
+ * Poke write.
+ *
+ * the caller is responsible for locking
+ */
+
+static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
+{
+	int rc;
+
+	acm->transmitting++;
+
+	wb->urb->transfer_buffer = wb->buf;
+	wb->urb->transfer_dma = wb->dmah;
+	wb->urb->transfer_buffer_length = wb->len;
+	wb->urb->dev = acm->dev;
+
+	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
+	if (rc < 0) {
+		if (rc != -EPERM)
+			dev_err(&acm->data->dev,
+				"%s - usb_submit_urb(write bulk) failed: %d\n",
+				__func__, rc);
+		acm_write_done(acm, wb);
+	}
+	return rc;
+}
+
+/*
+ * attributes exported through sysfs
+ */
+static ssize_t bmCapabilities_show
+(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct acm *acm = usb_get_intfdata(intf);
+
+	return sprintf(buf, "%d", acm->ctrl_caps);
+}
+static DEVICE_ATTR_RO(bmCapabilities);
+
+static ssize_t wCountryCodes_show
+(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct acm *acm = usb_get_intfdata(intf);
+
+	memcpy(buf, acm->country_codes, acm->country_code_size);
+	return acm->country_code_size;
+}
+
+static DEVICE_ATTR_RO(wCountryCodes);
+
+static ssize_t iCountryCodeRelDate_show
+(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct acm *acm = usb_get_intfdata(intf);
+
+	return sprintf(buf, "%d", acm->country_rel_date);
+}
+
+static DEVICE_ATTR_RO(iCountryCodeRelDate);
+/*
+ * Interrupt handlers for various ACM device responses
+ */
+
+static void acm_process_notification(struct acm *acm, unsigned char *buf)
+{
+	int newctrl;
+	int difference;
+	unsigned long flags;
+	struct usb_cdc_notification *dr = (struct usb_cdc_notification *)buf;
+	unsigned char *data = buf + sizeof(struct usb_cdc_notification);
+
+	switch (dr->bNotificationType) {
+	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
+		dev_dbg(&acm->control->dev,
+			"%s - network connection: %d\n", __func__, dr->wValue);
+		break;
+
+	case USB_CDC_NOTIFY_SERIAL_STATE:
+		if (le16_to_cpu(dr->wLength) != 2) {
+			dev_dbg(&acm->control->dev,
+				"%s - malformed serial state\n", __func__);
+			break;
+		}
+
+		newctrl = get_unaligned_le16(data);
+		dev_dbg(&acm->control->dev,
+			"%s - serial state: 0x%x\n", __func__, newctrl);
+
+		if (!acm->clocal && (acm->ctrlin & ~newctrl & USB_CDC_SERIAL_STATE_DCD)) {
+			dev_dbg(&acm->control->dev,
+				"%s - calling hangup\n", __func__);
+			tty_port_tty_hangup(&acm->port, false);
+		}
+
+		difference = acm->ctrlin ^ newctrl;
+		spin_lock_irqsave(&acm->read_lock, flags);
+		acm->ctrlin = newctrl;
+		acm->oldcount = acm->iocount;
+
+		if (difference & USB_CDC_SERIAL_STATE_DSR)
+			acm->iocount.dsr++;
+		if (difference & USB_CDC_SERIAL_STATE_DCD)
+			acm->iocount.dcd++;
+		if (newctrl & USB_CDC_SERIAL_STATE_BREAK) {
+			acm->iocount.brk++;
+			tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
+		}
+		if (newctrl & USB_CDC_SERIAL_STATE_RING_SIGNAL)
+			acm->iocount.rng++;
+		if (newctrl & USB_CDC_SERIAL_STATE_FRAMING)
+			acm->iocount.frame++;
+		if (newctrl & USB_CDC_SERIAL_STATE_PARITY)
+			acm->iocount.parity++;
+		if (newctrl & USB_CDC_SERIAL_STATE_OVERRUN)
+			acm->iocount.overrun++;
+		spin_unlock_irqrestore(&acm->read_lock, flags);
+
+		if (newctrl & USB_CDC_SERIAL_STATE_BREAK)
+			tty_flip_buffer_push(&acm->port);
+
+		if (difference)
+			wake_up_all(&acm->wioctl);
+
+		break;
+
+	default:
+		dev_dbg(&acm->control->dev,
+			"%s - unknown notification %d received: index %d len %d\n",
+			__func__,
+			dr->bNotificationType, dr->wIndex, dr->wLength);
+	}
+}
+
+/* control interface reports status changes with "interrupt" transfers */
+static void acm_ctrl_irq(struct urb *urb)
+{
+	struct acm *acm = urb->context;
+	struct usb_cdc_notification *dr = urb->transfer_buffer;
+	unsigned int current_size = urb->actual_length;
+	unsigned int expected_size, copy_size, alloc_size;
+	int retval;
+	int status = urb->status;
+
+	switch (status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/* this urb is terminated, clean up */
+		dev_dbg(&acm->control->dev,
+			"%s - urb shutting down with status: %d\n",
+			__func__, status);
+		return;
+	default:
+		dev_dbg(&acm->control->dev,
+			"%s - nonzero urb status received: %d\n",
+			__func__, status);
+		goto exit;
+	}
+
+	usb_mark_last_busy(acm->dev);
+
+	if (acm->nb_index)
+		dr = (struct usb_cdc_notification *)acm->notification_buffer;
+
+	/* size = notification-header + (optional) data */
+	expected_size = sizeof(struct usb_cdc_notification) +
+					le16_to_cpu(dr->wLength);
+
+	if (current_size < expected_size) {
+		/* notification is transmitted fragmented, reassemble */
+		if (acm->nb_size < expected_size) {
+			u8 *new_buffer;
+			alloc_size = roundup_pow_of_two(expected_size);
+			/* Final freeing is done on disconnect. */
+			new_buffer = krealloc(acm->notification_buffer,
+					      alloc_size, GFP_ATOMIC);
+			if (!new_buffer) {
+				acm->nb_index = 0;
+				goto exit;
+			}
+
+			acm->notification_buffer = new_buffer;
+			acm->nb_size = alloc_size;
+			dr = (struct usb_cdc_notification *)acm->notification_buffer;
+		}
+
+		copy_size = min(current_size,
+				expected_size - acm->nb_index);
+
+		memcpy(&acm->notification_buffer[acm->nb_index],
+		       urb->transfer_buffer, copy_size);
+		acm->nb_index += copy_size;
+		current_size = acm->nb_index;
+	}
+
+	if (current_size >= expected_size) {
+		/* notification complete */
+		acm_process_notification(acm, (unsigned char *)dr);
+		acm->nb_index = 0;
+	}
+
+exit:
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval && retval != -EPERM && retval != -ENODEV)
+		dev_err(&acm->control->dev,
+			"%s - usb_submit_urb failed: %d\n", __func__, retval);
+	else
+		dev_vdbg(&acm->control->dev,
+			"control resubmission terminated %d\n", retval);
+}
+
+static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
+{
+	int res;
+
+	if (!test_and_clear_bit(index, &acm->read_urbs_free))
+		return 0;
+
+	res = usb_submit_urb(acm->read_urbs[index], mem_flags);
+	if (res) {
+		if (res != -EPERM && res != -ENODEV) {
+			dev_err(&acm->data->dev,
+				"urb %d failed submission with %d\n",
+				index, res);
+		} else {
+			dev_vdbg(&acm->data->dev, "intended failure %d\n", res);
+		}
+		set_bit(index, &acm->read_urbs_free);
+		return res;
+	} else {
+		dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
+	}
+
+	return 0;
+}
+
+static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
+{
+	int res;
+	int i;
+
+	for (i = 0; i < acm->rx_buflimit; ++i) {
+		res = acm_submit_read_urb(acm, i, mem_flags);
+		if (res)
+			return res;
+	}
+
+	return 0;
+}
+
+static void acm_process_read_urb(struct acm *acm, struct urb *urb)
+{
+	unsigned long flags;
+
+	if (!urb->actual_length)
+		return;
+
+	spin_lock_irqsave(&acm->read_lock, flags);
+	tty_insert_flip_string(&acm->port, urb->transfer_buffer,
+			urb->actual_length);
+	spin_unlock_irqrestore(&acm->read_lock, flags);
+
+	tty_flip_buffer_push(&acm->port);
+}
+
+static void acm_read_bulk_callback(struct urb *urb)
+{
+	struct acm_rb *rb = urb->context;
+	struct acm *acm = rb->instance;
+	int status = urb->status;
+	bool stopped = false;
+	bool stalled = false;
+	bool cooldown = false;
+
+	dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
+		rb->index, urb->actual_length, status);
+
+	switch (status) {
+	case 0:
+		usb_mark_last_busy(acm->dev);
+		acm_process_read_urb(acm, urb);
+		break;
+	case -EPIPE:
+		set_bit(EVENT_RX_STALL, &acm->flags);
+		stalled = true;
+		break;
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		dev_dbg(&acm->data->dev,
+			"%s - urb shutting down with status: %d\n",
+			__func__, status);
+		stopped = true;
+		break;
+	case -EOVERFLOW:
+	case -EPROTO:
+		dev_dbg(&acm->data->dev,
+			"%s - cooling babbling device\n", __func__);
+		usb_mark_last_busy(acm->dev);
+		set_bit(rb->index, &acm->urbs_in_error_delay);
+		set_bit(ACM_ERROR_DELAY, &acm->flags);
+		cooldown = true;
+		break;
+	default:
+		dev_dbg(&acm->data->dev,
+			"%s - nonzero urb status received: %d\n",
+			__func__, status);
+		break;
+	}
+
+	/*
+	 * Make sure URB processing is done before marking as free to avoid
+	 * racing with unthrottle() on another CPU. Matches the barriers
+	 * implied by the test_and_clear_bit() in acm_submit_read_urb().
+	 */
+	smp_mb__before_atomic();
+	set_bit(rb->index, &acm->read_urbs_free);
+	/*
+	 * Make sure URB is marked as free before checking the throttled flag
+	 * to avoid racing with unthrottle() on another CPU. Matches the
+	 * smp_mb() in unthrottle().
+	 */
+	smp_mb__after_atomic();
+
+	if (stopped || stalled || cooldown) {
+		if (stalled)
+			schedule_delayed_work(&acm->dwork, 0);
+		else if (cooldown)
+			schedule_delayed_work(&acm->dwork, HZ / 2);
+		return;
+	}
+
+	if (test_bit(ACM_THROTTLED, &acm->flags))
+		return;
+
+	acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
+}
+
+/* data interface wrote those outgoing bytes */
+static void acm_write_bulk(struct urb *urb)
+{
+	struct acm_wb *wb = urb->context;
+	struct acm *acm = wb->instance;
+	unsigned long flags;
+	int status = urb->status;
+
+	if (status || (urb->actual_length != urb->transfer_buffer_length))
+		dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
+			urb->actual_length,
+			urb->transfer_buffer_length,
+			status);
+
+	spin_lock_irqsave(&acm->write_lock, flags);
+	acm_write_done(acm, wb);
+	spin_unlock_irqrestore(&acm->write_lock, flags);
+	set_bit(EVENT_TTY_WAKEUP, &acm->flags);
+	schedule_delayed_work(&acm->dwork, 0);
+}
+
+static void acm_softint(struct work_struct *work)
+{
+	int i;
+	struct acm *acm = container_of(work, struct acm, dwork.work);
+
+	if (test_bit(EVENT_RX_STALL, &acm->flags)) {
+		smp_mb(); /* against acm_suspend() */
+		if (!acm->susp_count) {
+			for (i = 0; i < acm->rx_buflimit; i++)
+				usb_kill_urb(acm->read_urbs[i]);
+			usb_clear_halt(acm->dev, acm->in);
+			acm_submit_read_urbs(acm, GFP_KERNEL);
+			clear_bit(EVENT_RX_STALL, &acm->flags);
+		}
+	}
+
+	if (test_and_clear_bit(ACM_ERROR_DELAY, &acm->flags)) {
+		for (i = 0; i < acm->rx_buflimit; i++)
+			if (test_and_clear_bit(i, &acm->urbs_in_error_delay))
+				acm_submit_read_urb(acm, i, GFP_KERNEL);
+	}
+
+	if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
+		tty_port_tty_wakeup(&acm->port);
+}
+
+/*
+ * TTY handlers
+ */
+
+static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+	struct acm *acm;
+	int retval;
+
+	acm = acm_get_by_minor(tty->index);
+	if (!acm)
+		return -ENODEV;
+
+	retval = tty_standard_install(driver, tty);
+	if (retval)
+		goto error_init_termios;
+
+	/*
+	 * Suppress initial echoing for some devices which might send data
+	 * immediately after acm driver has been installed.
+	 */
+	if (acm->quirks & DISABLE_ECHO)
+		tty->termios.c_lflag &= ~ECHO;
+
+	tty->driver_data = acm;
+
+	return 0;
+
+error_init_termios:
+	tty_port_put(&acm->port);
+	return retval;
+}
+
+static int acm_tty_open(struct tty_struct *tty, struct file *filp)
+{
+	struct acm *acm = tty->driver_data;
+
+	return tty_port_open(&acm->port, tty, filp);
+}
+
+static void acm_port_dtr_rts(struct tty_port *port, int raise)
+{
+	struct acm *acm = container_of(port, struct acm, port);
+	int val;
+	int res;
+
+	if (raise)
+		val = USB_CDC_CTRL_DTR | USB_CDC_CTRL_RTS;
+	else
+		val = 0;
+
+	/* FIXME: add missing ctrlout locking throughout driver */
+	acm->ctrlout = val;
+
+	res = acm_set_control(acm, val);
+	if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
+		/* This is broken in too many devices to spam the logs */
+		dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
+}
+
+static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
+{
+	struct acm *acm = container_of(port, struct acm, port);
+	int retval = -ENODEV;
+	int i;
+
+	mutex_lock(&acm->mutex);
+	if (acm->disconnected)
+		goto disconnected;
+
+	retval = usb_autopm_get_interface(acm->control);
+	if (retval)
+		goto error_get_interface;
+
+	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
+	acm->control->needs_remote_wakeup = 1;
+
+	acm->ctrlurb->dev = acm->dev;
+	retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
+	if (retval) {
+		dev_err(&acm->control->dev,
+			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
+		goto error_submit_urb;
+	}
+
+	acm_tty_set_termios(tty, NULL);
+
+	/*
+	 * Unthrottle device in case the TTY was closed while throttled.
+	 */
+	clear_bit(ACM_THROTTLED, &acm->flags);
+
+	retval = acm_submit_read_urbs(acm, GFP_KERNEL);
+	if (retval)
+		goto error_submit_read_urbs;
+
+	usb_autopm_put_interface(acm->control);
+
+	mutex_unlock(&acm->mutex);
+
+	return 0;
+
+error_submit_read_urbs:
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_kill_urb(acm->read_urbs[i]);
+	usb_kill_urb(acm->ctrlurb);
+error_submit_urb:
+	usb_autopm_put_interface(acm->control);
+error_get_interface:
+disconnected:
+	mutex_unlock(&acm->mutex);
+
+	return usb_translate_errors(retval);
+}
+
+static void acm_port_destruct(struct tty_port *port)
+{
+	struct acm *acm = container_of(port, struct acm, port);
+
+	if (acm->minor != ACM_MINOR_INVALID)
+		acm_release_minor(acm);
+	usb_put_intf(acm->control);
+	kfree(acm->country_codes);
+	kfree(acm);
+}
+
+static void acm_port_shutdown(struct tty_port *port)
+{
+	struct acm *acm = container_of(port, struct acm, port);
+	struct urb *urb;
+	struct acm_wb *wb;
+
+	/*
+	 * Need to grab write_lock to prevent race with resume, but no need to
+	 * hold it due to the tty-port initialised flag.
+	 */
+	acm_poison_urbs(acm);
+	spin_lock_irq(&acm->write_lock);
+	spin_unlock_irq(&acm->write_lock);
+
+	usb_autopm_get_interface_no_resume(acm->control);
+	acm->control->needs_remote_wakeup = 0;
+	usb_autopm_put_interface(acm->control);
+
+	for (;;) {
+		urb = usb_get_from_anchor(&acm->delayed);
+		if (!urb)
+			break;
+		wb = urb->context;
+		wb->use = false;
+		usb_autopm_put_interface_async(acm->control);
+	}
+
+	acm_unpoison_urbs(acm);
+
+}
+
+static void acm_tty_cleanup(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+
+	tty_port_put(&acm->port);
+}
+
+static void acm_tty_hangup(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+
+	tty_port_hangup(&acm->port);
+}
+
+static void acm_tty_close(struct tty_struct *tty, struct file *filp)
+{
+	struct acm *acm = tty->driver_data;
+
+	tty_port_close(&acm->port, tty, filp);
+}
+
+static int acm_tty_write(struct tty_struct *tty,
+					const unsigned char *buf, int count)
+{
+	struct acm *acm = tty->driver_data;
+	int stat;
+	unsigned long flags;
+	int wbn;
+	struct acm_wb *wb;
+
+	if (!count)
+		return 0;
+
+	dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);
+
+	spin_lock_irqsave(&acm->write_lock, flags);
+	wbn = acm_wb_alloc(acm);
+	if (wbn < 0) {
+		spin_unlock_irqrestore(&acm->write_lock, flags);
+		return 0;
+	}
+	wb = &acm->wb[wbn];
+
+	if (!acm->dev) {
+		wb->use = false;
+		spin_unlock_irqrestore(&acm->write_lock, flags);
+		return -ENODEV;
+	}
+
+	count = (count > acm->writesize) ? acm->writesize : count;
+	dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
+	memcpy(wb->buf, buf, count);
+	wb->len = count;
+
+	stat = usb_autopm_get_interface_async(acm->control);
+	if (stat) {
+		wb->use = false;
+		spin_unlock_irqrestore(&acm->write_lock, flags);
+		return stat;
+	}
+
+	if (acm->susp_count) {
+		usb_anchor_urb(wb->urb, &acm->delayed);
+		spin_unlock_irqrestore(&acm->write_lock, flags);
+		return count;
+	}
+
+	stat = acm_start_wb(acm, wb);
+	spin_unlock_irqrestore(&acm->write_lock, flags);
+
+	if (stat < 0)
+		return stat;
+	return count;
+}
+
+static unsigned int acm_tty_write_room(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+	/*
+	 * Do not let the line discipline to know that we have a reserve,
+	 * or it might get too enthusiastic.
+	 */
+	return acm_wb_is_avail(acm) ? acm->writesize : 0;
+}
+
+static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+	/*
+	 * if the device was unplugged then any remaining characters fell out
+	 * of the connector ;)
+	 */
+	if (acm->disconnected)
+		return 0;
+	/*
+	 * This is inaccurate (overcounts), but it works.
+	 */
+	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
+}
+
+static void acm_tty_throttle(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+
+	set_bit(ACM_THROTTLED, &acm->flags);
+}
+
+static void acm_tty_unthrottle(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+
+	clear_bit(ACM_THROTTLED, &acm->flags);
+
+	/* Matches the smp_mb__after_atomic() in acm_read_bulk_callback(). */
+	smp_mb();
+
+	acm_submit_read_urbs(acm, GFP_KERNEL);
+}
+
+static int acm_tty_break_ctl(struct tty_struct *tty, int state)
+{
+	struct acm *acm = tty->driver_data;
+	int retval;
+
+	if (!(acm->ctrl_caps & USB_CDC_CAP_BRK))
+		return -EOPNOTSUPP;
+
+	retval = acm_send_break(acm, state ? 0xffff : 0);
+	if (retval < 0)
+		dev_dbg(&acm->control->dev,
+			"%s - send break failed\n", __func__);
+	return retval;
+}
+
+static int acm_tty_tiocmget(struct tty_struct *tty)
+{
+	struct acm *acm = tty->driver_data;
+
+	return (acm->ctrlout & USB_CDC_CTRL_DTR ? TIOCM_DTR : 0) |
+	       (acm->ctrlout & USB_CDC_CTRL_RTS ? TIOCM_RTS : 0) |
+	       (acm->ctrlin  & USB_CDC_SERIAL_STATE_DSR ? TIOCM_DSR : 0) |
+	       (acm->ctrlin  & USB_CDC_SERIAL_STATE_RING_SIGNAL ? TIOCM_RI : 0) |
+	       (acm->ctrlin  & USB_CDC_SERIAL_STATE_DCD ? TIOCM_CD : 0) |
+	       TIOCM_CTS;
+}
+
+static int acm_tty_tiocmset(struct tty_struct *tty,
+			    unsigned int set, unsigned int clear)
+{
+	struct acm *acm = tty->driver_data;
+	unsigned int newctrl;
+
+	newctrl = acm->ctrlout;
+	set = (set & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
+	      (set & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
+	clear = (clear & TIOCM_DTR ? USB_CDC_CTRL_DTR : 0) |
+		(clear & TIOCM_RTS ? USB_CDC_CTRL_RTS : 0);
+
+	newctrl = (newctrl & ~clear) | set;
+
+	if (acm->ctrlout == newctrl)
+		return 0;
+	return acm_set_control(acm, acm->ctrlout = newctrl);
+}
+
+static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
+{
+	struct acm *acm = tty->driver_data;
+
+	ss->line = acm->minor;
+	ss->close_delay	= jiffies_to_msecs(acm->port.close_delay) / 10;
+	ss->closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+				ASYNC_CLOSING_WAIT_NONE :
+				jiffies_to_msecs(acm->port.closing_wait) / 10;
+	return 0;
+}
+
+static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
+{
+	struct acm *acm = tty->driver_data;
+	unsigned int closing_wait, close_delay;
+	int retval = 0;
+
+	close_delay = msecs_to_jiffies(ss->close_delay * 10);
+	closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+			ASYNC_CLOSING_WAIT_NONE :
+			msecs_to_jiffies(ss->closing_wait * 10);
+
+	mutex_lock(&acm->port.mutex);
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		if ((close_delay != acm->port.close_delay) ||
+		    (closing_wait != acm->port.closing_wait))
+			retval = -EPERM;
+	} else {
+		acm->port.close_delay  = close_delay;
+		acm->port.closing_wait = closing_wait;
+	}
+
+	mutex_unlock(&acm->port.mutex);
+	return retval;
+}
+
+static int wait_serial_change(struct acm *acm, unsigned long arg)
+{
+	int rv = 0;
+	DECLARE_WAITQUEUE(wait, current);
+	struct async_icount old, new;
+
+	do {
+		spin_lock_irq(&acm->read_lock);
+		old = acm->oldcount;
+		new = acm->iocount;
+		acm->oldcount = new;
+		spin_unlock_irq(&acm->read_lock);
+
+		if ((arg & TIOCM_DSR) &&
+			old.dsr != new.dsr)
+			break;
+		if ((arg & TIOCM_CD)  &&
+			old.dcd != new.dcd)
+			break;
+		if ((arg & TIOCM_RI) &&
+			old.rng != new.rng)
+			break;
+
+		add_wait_queue(&acm->wioctl, &wait);
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule();
+		remove_wait_queue(&acm->wioctl, &wait);
+		if (acm->disconnected) {
+			if (arg & TIOCM_CD)
+				break;
+			else
+				rv = -ENODEV;
+		} else {
+			if (signal_pending(current))
+				rv = -ERESTARTSYS;
+		}
+	} while (!rv);
+
+	
+
+	return rv;
+}
+
+static int acm_tty_get_icount(struct tty_struct *tty,
+					struct serial_icounter_struct *icount)
+{
+	struct acm *acm = tty->driver_data;
+
+	icount->dsr = acm->iocount.dsr;
+	icount->rng = acm->iocount.rng;
+	icount->dcd = acm->iocount.dcd;
+	icount->frame = acm->iocount.frame;
+	icount->overrun = acm->iocount.overrun;
+	icount->parity = acm->iocount.parity;
+	icount->brk = acm->iocount.brk;
+
+	return 0;
+}
+
+static int acm_tty_ioctl(struct tty_struct *tty,
+					unsigned int cmd, unsigned long arg)
+{
+	struct acm *acm = tty->driver_data;
+	int rv = -ENOIOCTLCMD;
+
+	switch (cmd) {
+	case TIOCMIWAIT:
+		rv = usb_autopm_get_interface(acm->control);
+		if (rv < 0) {
+			rv = -EIO;
+			break;
+		}
+		rv = wait_serial_change(acm, arg);
+		usb_autopm_put_interface(acm->control);
+		break;
+	}
+
+	return rv;
+}
+
+static void acm_tty_set_termios(struct tty_struct *tty,
+				const struct ktermios *termios_old)
+{
+	struct acm *acm = tty->driver_data;
+	struct ktermios *termios = &tty->termios;
+	struct usb_cdc_line_coding newline;
+	int newctrl = acm->ctrlout;
+
+	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
+	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
+	newline.bParityType = termios->c_cflag & PARENB ?
+				(termios->c_cflag & PARODD ? 1 : 2) +
+				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
+	newline.bDataBits = tty_get_char_size(termios->c_cflag);
+
+	/* FIXME: Needs to clear unsupported bits in the termios */
+	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
+
+	if (C_BAUD(tty) == B0) {
+		newline.dwDTERate = acm->line.dwDTERate;
+		newctrl &= ~USB_CDC_CTRL_DTR;
+	} else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
+		newctrl |=  USB_CDC_CTRL_DTR;
+	}
+
+	if (newctrl != acm->ctrlout)
+		acm_set_control(acm, acm->ctrlout = newctrl);
+
+	if (memcmp(&acm->line, &newline, sizeof newline)) {
+		memcpy(&acm->line, &newline, sizeof newline);
+		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
+			__func__,
+			le32_to_cpu(newline.dwDTERate),
+			newline.bCharFormat, newline.bParityType,
+			newline.bDataBits);
+		acm_set_line(acm, &acm->line);
+	}
+}
+
+static const struct tty_port_operations acm_port_ops = {
+	.dtr_rts = acm_port_dtr_rts,
+	.shutdown = acm_port_shutdown,
+	.activate = acm_port_activate,
+	.destruct = acm_port_destruct,
+};
+
+/*
+ * USB probe and disconnect routines.
+ */
+
+/* Little helpers: write/read buffers free */
+static void acm_write_buffers_free(struct acm *acm)
+{
+	int i;
+	struct acm_wb *wb;
+
+	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
+		usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
+}
+
+static void acm_read_buffers_free(struct acm *acm)
+{
+	int i;
+
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_free_coherent(acm->dev, acm->readsize,
+			  acm->read_buffers[i].base, acm->read_buffers[i].dma);
+}
+
+/* Little helper: write buffers allocate */
+static int acm_write_buffers_alloc(struct acm *acm)
+{
+	int i;
+	struct acm_wb *wb;
+
+	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
+		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
+		    &wb->dmah);
+		if (!wb->buf) {
+			while (i != 0) {
+				--i;
+				--wb;
+				usb_free_coherent(acm->dev, acm->writesize,
+				    wb->buf, wb->dmah);
+			}
+			return -ENOMEM;
+		}
+	}
+	return 0;
+}
+
+static int acm_probe(struct usb_interface *intf,
+		     const struct usb_device_id *id)
+{
+	struct usb_cdc_union_desc *union_header = NULL;
+	struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
+	unsigned char *buffer = intf->altsetting->extra;
+	int buflen = intf->altsetting->extralen;
+	struct usb_interface *control_interface;
+	struct usb_interface *data_interface;
+	struct usb_endpoint_descriptor *epctrl = NULL;
+	struct usb_endpoint_descriptor *epread = NULL;
+	struct usb_endpoint_descriptor *epwrite = NULL;
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+	struct usb_cdc_parsed_header h;
+	struct acm *acm;
+	int minor;
+	int ctrlsize, readsize;
+	u8 *buf;
+	int call_intf_num = -1;
+	int data_intf_num = -1;
+	unsigned long quirks;
+	int num_rx_buf;
+	int i;
+	int combined_interfaces = 0;
+	struct device *tty_dev;
+	int rv = -ENOMEM;
+	int res;
+
+	/* normal quirks */
+	quirks = (unsigned long)id->driver_info;
+
+	if (quirks == IGNORE_DEVICE)
+		return -ENODEV;
+
+	memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));
+
+	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
+
+	/* handle quirks deadly to normal probing*/
+	if (quirks == NO_UNION_NORMAL) {
+		data_interface = usb_ifnum_to_if(usb_dev, 1);
+		control_interface = usb_ifnum_to_if(usb_dev, 0);
+		/* we would crash */
+		if (!data_interface || !control_interface)
+			return -ENODEV;
+		goto skip_normal_probe;
+	}
+
+	/* normal probing*/
+	if (!buffer) {
+		dev_err(&intf->dev, "Weird descriptor references\n");
+		return -EINVAL;
+	}
+
+	if (!buflen) {
+		if (intf->cur_altsetting->endpoint &&
+				intf->cur_altsetting->endpoint->extralen &&
+				intf->cur_altsetting->endpoint->extra) {
+			dev_dbg(&intf->dev,
+				"Seeking extra descriptors on endpoint\n");
+			buflen = intf->cur_altsetting->endpoint->extralen;
+			buffer = intf->cur_altsetting->endpoint->extra;
+		} else {
+			dev_err(&intf->dev,
+				"Zero length descriptor references\n");
+			return -EINVAL;
+		}
+	}
+
+	cdc_parse_cdc_header(&h, intf, buffer, buflen);
+	union_header = h.usb_cdc_union_desc;
+	cmgmd = h.usb_cdc_call_mgmt_descriptor;
+	if (cmgmd)
+		call_intf_num = cmgmd->bDataInterface;
+
+	if (!union_header) {
+		if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
+			dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
+			combined_interfaces = 1;
+			control_interface = data_interface = intf;
+			goto look_for_collapsed_interface;
+		} else if (call_intf_num > 0) {
+			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
+			data_intf_num = call_intf_num;
+			data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
+			control_interface = intf;
+		} else {
+			dev_dbg(&intf->dev, "No union descriptor, giving up\n");
+			return -ENODEV;
+		}
+	} else {
+		int class = -1;
+
+		data_intf_num = union_header->bSlaveInterface0;
+		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
+		data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
+
+		if (control_interface)
+			class = control_interface->cur_altsetting->desc.bInterfaceClass;
+
+		if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
+			dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
+			combined_interfaces = 1;
+			control_interface = data_interface = intf;
+			goto look_for_collapsed_interface;
+		}
+	}
+
+	if (!control_interface || !data_interface) {
+		dev_dbg(&intf->dev, "no interfaces\n");
+		return -ENODEV;
+	}
+
+	if (data_intf_num != call_intf_num)
+		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
+
+	if (control_interface == data_interface) {
+		/* some broken devices designed for windows work this way */
+		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
+		combined_interfaces = 1;
+		/* a popular other OS doesn't use it */
+		quirks |= NO_CAP_LINE;
+		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
+			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
+			return -EINVAL;
+		}
+look_for_collapsed_interface:
+		res = usb_find_common_endpoints(data_interface->cur_altsetting,
+				&epread, &epwrite, &epctrl, NULL);
+		if (res)
+			return res;
+
+		goto made_compressed_probe;
+	}
+
+skip_normal_probe:
+
+	/*workaround for switched interfaces */
+	if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
+		if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
+			dev_dbg(&intf->dev,
+				"Your device has switched interfaces.\n");
+			swap(control_interface, data_interface);
+		} else {
+			return -EINVAL;
+		}
+	}
+
+	/* Accept probe requests only for the control interface */
+	if (!combined_interfaces && intf != control_interface)
+		return -ENODEV;
+
+	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
+	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
+		return -EINVAL;
+
+	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
+	epread = &data_interface->cur_altsetting->endpoint[0].desc;
+	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
+
+
+	/* workaround for switched endpoints */
+	if (!usb_endpoint_dir_in(epread)) {
+		/* descriptors are swapped */
+		dev_dbg(&intf->dev,
+			"The data interface has switched endpoints\n");
+		swap(epread, epwrite);
+	}
+made_compressed_probe:
+	dev_dbg(&intf->dev, "interfaces are valid\n");
+
+	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
+	if (!acm)
+		return -ENOMEM;
+
+	tty_port_init(&acm->port);
+	acm->port.ops = &acm_port_ops;
+
+	ctrlsize = usb_endpoint_maxp(epctrl);
+	readsize = usb_endpoint_maxp(epread) *
+				(quirks == SINGLE_RX_URB ? 1 : 2);
+	acm->combined_interfaces = combined_interfaces;
+	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
+	acm->control = control_interface;
+	acm->data = data_interface;
+
+	usb_get_intf(acm->control); /* undone in destruct() */
+
+	minor = acm_alloc_minor(acm);
+	if (minor < 0) {
+		acm->minor = ACM_MINOR_INVALID;
+		goto err_put_port;
+	}
+
+	acm->minor = minor;
+	acm->dev = usb_dev;
+	if (h.usb_cdc_acm_descriptor)
+		acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
+	if (quirks & NO_CAP_LINE)
+		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
+	acm->ctrlsize = ctrlsize;
+	acm->readsize = readsize;
+	acm->rx_buflimit = num_rx_buf;
+	INIT_DELAYED_WORK(&acm->dwork, acm_softint);
+	init_waitqueue_head(&acm->wioctl);
+	spin_lock_init(&acm->write_lock);
+	spin_lock_init(&acm->read_lock);
+	mutex_init(&acm->mutex);
+	if (usb_endpoint_xfer_int(epread)) {
+		acm->bInterval = epread->bInterval;
+		acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
+	} else {
+		acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
+	}
+	if (usb_endpoint_xfer_int(epwrite))
+		acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
+	else
+		acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
+	init_usb_anchor(&acm->delayed);
+	acm->quirks = quirks;
+
+	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
+	if (!buf)
+		goto err_put_port;
+	acm->ctrl_buffer = buf;
+
+	if (acm_write_buffers_alloc(acm) < 0)
+		goto err_free_ctrl_buffer;
+
+	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!acm->ctrlurb)
+		goto err_free_write_buffers;
+
+	for (i = 0; i < num_rx_buf; i++) {
+		struct acm_rb *rb = &(acm->read_buffers[i]);
+		struct urb *urb;
+
+		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
+								&rb->dma);
+		if (!rb->base)
+			goto err_free_read_urbs;
+		rb->index = i;
+		rb->instance = acm;
+
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb)
+			goto err_free_read_urbs;
+
+		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		urb->transfer_dma = rb->dma;
+		if (usb_endpoint_xfer_int(epread))
+			usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
+					 acm->readsize,
+					 acm_read_bulk_callback, rb,
+					 acm->bInterval);
+		else
+			usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
+					  acm->readsize,
+					  acm_read_bulk_callback, rb);
+
+		acm->read_urbs[i] = urb;
+		__set_bit(i, &acm->read_urbs_free);
+	}
+	for (i = 0; i < ACM_NW; i++) {
+		struct acm_wb *snd = &(acm->wb[i]);
+
+		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!snd->urb)
+			goto err_free_write_urbs;
+
+		if (usb_endpoint_xfer_int(epwrite))
+			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
+				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
+		else
+			usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
+				NULL, acm->writesize, acm_write_bulk, snd);
+		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		if (quirks & SEND_ZERO_PACKET)
+			snd->urb->transfer_flags |= URB_ZERO_PACKET;
+		snd->instance = acm;
+	}
+
+	usb_set_intfdata(intf, acm);
+
+	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
+	if (i < 0)
+		goto err_free_write_urbs;
+
+	if (h.usb_cdc_country_functional_desc) { /* export the country data */
+		struct usb_cdc_country_functional_desc * cfd =
+					h.usb_cdc_country_functional_desc;
+
+		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
+		if (!acm->country_codes)
+			goto skip_countries;
+		acm->country_code_size = cfd->bLength - 4;
+		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
+							cfd->bLength - 4);
+		acm->country_rel_date = cfd->iCountryCodeRelDate;
+
+		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
+		if (i < 0) {
+			kfree(acm->country_codes);
+			acm->country_codes = NULL;
+			acm->country_code_size = 0;
+			goto skip_countries;
+		}
+
+		i = device_create_file(&intf->dev,
+						&dev_attr_iCountryCodeRelDate);
+		if (i < 0) {
+			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
+			kfree(acm->country_codes);
+			acm->country_codes = NULL;
+			acm->country_code_size = 0;
+			goto skip_countries;
+		}
+	}
+
+skip_countries:
+	usb_fill_int_urb(acm->ctrlurb, usb_dev,
+			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
+			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
+			 /* works around buggy devices */
+			 epctrl->bInterval ? epctrl->bInterval : 16);
+	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	acm->ctrlurb->transfer_dma = acm->ctrl_dma;
+	acm->notification_buffer = NULL;
+	acm->nb_index = 0;
+	acm->nb_size = 0;
+
+	acm->line.dwDTERate = cpu_to_le32(9600);
+	acm->line.bDataBits = 8;
+	acm_set_line(acm, &acm->line);
+
+	if (!acm->combined_interfaces) {
+		rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
+		if (rv)
+			goto err_remove_files;
+	}
+
+	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
+			&control_interface->dev);
+	if (IS_ERR(tty_dev)) {
+		rv = PTR_ERR(tty_dev);
+		goto err_release_data_interface;
+	}
+
+	if (quirks & CLEAR_HALT_CONDITIONS) {
+		usb_clear_halt(usb_dev, acm->in);
+		usb_clear_halt(usb_dev, acm->out);
+	}
+
+	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
+
+	return 0;
+
+err_release_data_interface:
+	if (!acm->combined_interfaces) {
+		/* Clear driver data so that disconnect() returns early. */
+		usb_set_intfdata(data_interface, NULL);
+		usb_driver_release_interface(&acm_driver, data_interface);
+	}
+err_remove_files:
+	if (acm->country_codes) {
+		device_remove_file(&acm->control->dev,
+				&dev_attr_wCountryCodes);
+		device_remove_file(&acm->control->dev,
+				&dev_attr_iCountryCodeRelDate);
+	}
+	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
+err_free_write_urbs:
+	for (i = 0; i < ACM_NW; i++)
+		usb_free_urb(acm->wb[i].urb);
+err_free_read_urbs:
+	for (i = 0; i < num_rx_buf; i++)
+		usb_free_urb(acm->read_urbs[i]);
+	acm_read_buffers_free(acm);
+	usb_free_urb(acm->ctrlurb);
+err_free_write_buffers:
+	acm_write_buffers_free(acm);
+err_free_ctrl_buffer:
+	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
+err_put_port:
+	tty_port_put(&acm->port);
+
+	return rv;
+}
+
+static void acm_disconnect(struct usb_interface *intf)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+	struct tty_struct *tty;
+	int i;
+
+	/* sibling interface is already cleaning up */
+	if (!acm)
+		return;
+
+	acm->disconnected = true;
+	/*
+	 * there is a circular dependency. acm_softint() can resubmit
+	 * the URBs in error handling so we need to block any
+	 * submission right away
+	 */
+	acm_poison_urbs(acm);
+	mutex_lock(&acm->mutex);
+	if (acm->country_codes) {
+		device_remove_file(&acm->control->dev,
+				&dev_attr_wCountryCodes);
+		device_remove_file(&acm->control->dev,
+				&dev_attr_iCountryCodeRelDate);
+	}
+	wake_up_all(&acm->wioctl);
+	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
+	usb_set_intfdata(acm->control, NULL);
+	usb_set_intfdata(acm->data, NULL);
+	mutex_unlock(&acm->mutex);
+
+	tty = tty_port_tty_get(&acm->port);
+	if (tty) {
+		tty_vhangup(tty);
+		tty_kref_put(tty);
+	}
+
+	cancel_delayed_work_sync(&acm->dwork);
+
+	tty_unregister_device(acm_tty_driver, acm->minor);
+
+	usb_free_urb(acm->ctrlurb);
+	for (i = 0; i < ACM_NW; i++)
+		usb_free_urb(acm->wb[i].urb);
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_free_urb(acm->read_urbs[i]);
+	acm_write_buffers_free(acm);
+	usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
+	acm_read_buffers_free(acm);
+
+	kfree(acm->notification_buffer);
+
+	if (!acm->combined_interfaces)
+		usb_driver_release_interface(&acm_driver, intf == acm->control ?
+					acm->data : acm->control);
+
+	tty_port_put(&acm->port);
+}
+
+#ifdef CONFIG_PM
+static int acm_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+	int cnt;
+
+	spin_lock_irq(&acm->write_lock);
+	if (PMSG_IS_AUTO(message)) {
+		if (acm->transmitting) {
+			spin_unlock_irq(&acm->write_lock);
+			return -EBUSY;
+		}
+	}
+	cnt = acm->susp_count++;
+	spin_unlock_irq(&acm->write_lock);
+
+	if (cnt)
+		return 0;
+
+	acm_poison_urbs(acm);
+	cancel_delayed_work_sync(&acm->dwork);
+	acm->urbs_in_error_delay = 0;
+
+	return 0;
+}
+
+static int acm_resume(struct usb_interface *intf)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+	struct urb *urb;
+	int rv = 0;
+
+	spin_lock_irq(&acm->write_lock);
+
+	if (--acm->susp_count)
+		goto out;
+
+	acm_unpoison_urbs(acm);
+
+	if (tty_port_initialized(&acm->port)) {
+		rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
+
+		for (;;) {
+			urb = usb_get_from_anchor(&acm->delayed);
+			if (!urb)
+				break;
+
+			acm_start_wb(acm, urb->context);
+		}
+
+		/*
+		 * delayed error checking because we must
+		 * do the write path at all cost
+		 */
+		if (rv < 0)
+			goto out;
+
+		rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
+	}
+out:
+	spin_unlock_irq(&acm->write_lock);
+
+	return rv;
+}
+
+static int acm_reset_resume(struct usb_interface *intf)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+
+	if (tty_port_initialized(&acm->port))
+		tty_port_tty_hangup(&acm->port, false);
+
+	return acm_resume(intf);
+}
+
+#endif /* CONFIG_PM */
+
+static int acm_pre_reset(struct usb_interface *intf)
+{
+	struct acm *acm = usb_get_intfdata(intf);
+
+	clear_bit(EVENT_RX_STALL, &acm->flags);
+	acm->nb_index = 0; /* pending control transfers are lost */
+
+	return 0;
+}
+
+#define NOKIA_PCSUITE_ACM_INFO(x) \
+		USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
+		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
+		USB_CDC_ACM_PROTO_VENDOR)
+
+#define SAMSUNG_PCSUITE_ACM_INFO(x) \
+		USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
+		USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
+		USB_CDC_ACM_PROTO_VENDOR)
+
+/*
+ * USB driver structure.
+ */
+
+static const struct usb_device_id acm_ids[] = {
+	/* quirky and broken devices */
+	{ USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */
+	  .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */
+	{ USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
+	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
+	{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
+	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
+	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x045b, 0x023c),	/* Renesas USB Download mode */
+	.driver_info = DISABLE_ECHO,	/* Don't echo banner */
+	},
+	{ USB_DEVICE(0x045b, 0x0248),	/* Renesas USB Download mode */
+	.driver_info = DISABLE_ECHO,	/* Don't echo banner */
+	},
+	{ USB_DEVICE(0x045b, 0x024D),	/* Renesas USB Download mode */
+	.driver_info = DISABLE_ECHO,	/* Don't echo banner */
+	},
+	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0e8d, 0x2000), /* MediaTek Inc Preloader */
+	.driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
+	},
+	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
+	.driver_info = SINGLE_RX_URB,
+	},
+	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
+	.driver_info = SINGLE_RX_URB, /* firmware bug */
+	},
+	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
+	.driver_info = SINGLE_RX_URB, /* firmware bug */
+	},
+	{ USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
+	.driver_info = SINGLE_RX_URB,
+	},
+	{ USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x0572, 0x1349), /* Hiro (Conexant) USB MODEM H50228 */
+	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+	},
+	{ USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
+	.driver_info = QUIRK_CONTROL_LINE_STATE, },
+	{ USB_DEVICE(0x2184, 0x001c) },	/* GW Instek AFG-2225 */
+	{ USB_DEVICE(0x2184, 0x0036) },	/* GW Instek AFG-125 */
+	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
+	},
+	/* Motorola H24 HSPA module: */
+	{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
+	{ USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+	{ USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+	{ USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+	{ USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+	{ USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+	{ USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+	{ USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
+	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
+	},
+
+	{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
+	.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
+					   data interface instead of
+					   communications interface.
+					   Maybe we should define a new
+					   quirk for this. */
+	},
+	{ USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
+	.driver_info = NO_UNION_NORMAL,
+	},
+	{ USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
+	.driver_info = NO_UNION_NORMAL,
+	},
+	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
+	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
+	},
+	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
+	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
+	},
+	{ USB_DEVICE(0xfff0, 0x0100), /* DATECS FP-2000 */
+	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
+	},
+	{ USB_DEVICE(0x09d8, 0x0320), /* Elatec GmbH TWN3 */
+	.driver_info = NO_UNION_NORMAL, /* has misplaced union descriptor */
+	},
+	{ USB_DEVICE(0x0c26, 0x0020), /* Icom ICF3400 Serie */
+	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
+	},
+	{ USB_DEVICE(0x0ca6, 0xa050), /* Castles VEGA3000 */
+	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
+	},
+
+	{ USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
+	.driver_info = CLEAR_HALT_CONDITIONS,
+	},
+
+	/* Nokia S60 phones expose two ACM channels. The first is
+	 * a modem and is picked up by the standard AT-command
+	 * information below. The second is 'vendor-specific' but
+	 * is treated as a serial device at the S60 end, so we want
+	 * to expose it on Linux too. */
+	{ NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
+	{ NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
+	{ NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
+	{ NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
+	{ NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0099), }, /* Nokia 6210 Navigator, RM-367 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0128), }, /* Nokia 6210 Navigator, RM-419 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x008f), }, /* Nokia 6220 Classic */
+	{ NOKIA_PCSUITE_ACM_INFO(0x00a0), }, /* Nokia 6650 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x007b), }, /* Nokia N78 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0094), }, /* Nokia N85 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x003a), }, /* Nokia N96 & N96-3  */
+	{ NOKIA_PCSUITE_ACM_INFO(0x00e9), }, /* Nokia 5320 XpressMusic */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0108), }, /* Nokia 5320 XpressMusic 2G */
+	{ NOKIA_PCSUITE_ACM_INFO(0x01f5), }, /* Nokia N97, RM-505 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
+	{ NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
+	{ NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
+	{ NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
+	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
+
+	/* Support for Owen devices */
+	{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
+
+	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
+
+#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
+	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
+	.driver_info = IGNORE_DEVICE,
+	},
+	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
+	.driver_info = IGNORE_DEVICE,
+	},
+#endif
+
+#if IS_ENABLED(CONFIG_IR_TOY)
+	{ USB_DEVICE(0x04d8, 0xfd08),
+	.driver_info = IGNORE_DEVICE,
+	},
+
+	{ USB_DEVICE(0x04d8, 0xf58b),
+	.driver_info = IGNORE_DEVICE,
+	},
+#endif
+
+#if IS_ENABLED(CONFIG_USB_SERIAL_XR)
+	{ USB_DEVICE(0x04e2, 0x1400), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1401), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1402), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1403), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1410), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1411), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1412), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1414), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1420), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1422), .driver_info = IGNORE_DEVICE },
+	{ USB_DEVICE(0x04e2, 0x1424), .driver_info = IGNORE_DEVICE },
+#endif
+
+	/*Samsung phone in firmware update mode */
+	{ USB_DEVICE(0x04e8, 0x685d),
+	.driver_info = IGNORE_DEVICE,
+	},
+
+	/* Exclude Infineon Flash Loader utility */
+	{ USB_DEVICE(0x058b, 0x0041),
+	.driver_info = IGNORE_DEVICE,
+	},
+
+	/* Exclude ETAS ES58x */
+	{ USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
+	.driver_info = IGNORE_DEVICE,
+	},
+	{ USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
+	.driver_info = IGNORE_DEVICE,
+	},
+	{ USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
+	.driver_info = IGNORE_DEVICE,
+	},
+
+	{ USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
+	.driver_info = SEND_ZERO_PACKET,
+	},
+	{ USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
+	.driver_info = SEND_ZERO_PACKET,
+	},
+
+	/* Exclude Goodix Fingerprint Reader */
+	{ USB_DEVICE(0x27c6, 0x5395),
+	.driver_info = IGNORE_DEVICE,
+	},
+
+	/* Exclude Heimann Sensor GmbH USB appset demo */
+	{ USB_DEVICE(0x32a7, 0x0000),
+	.driver_info = IGNORE_DEVICE,
+	},
+
+	/* control interfaces without any protocol set */
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_PROTO_NONE) },
+
+	/* control interfaces with various AT-command sets */
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_ACM_PROTO_AT_V25TER) },
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_ACM_PROTO_AT_PCCA101) },
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_ACM_PROTO_AT_GSM) },
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_ACM_PROTO_AT_3G) },
+	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
+		USB_CDC_ACM_PROTO_AT_CDMA) },
+
+	{ USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
+	.driver_info = SEND_ZERO_PACKET,
+	},
+
+	{ }
+};
+
+MODULE_DEVICE_TABLE(usb, acm_ids);
+
+static struct usb_driver acm_driver = {
+	.name =		"cdc_acm",
+	.probe =	acm_probe,
+	.disconnect =	acm_disconnect,
+#ifdef CONFIG_PM
+	.suspend =	acm_suspend,
+	.resume =	acm_resume,
+	.reset_resume =	acm_reset_resume,
+#endif
+	.pre_reset =	acm_pre_reset,
+	.id_table =	acm_ids,
+#ifdef CONFIG_PM
+	.supports_autosuspend = 1,
+#endif
+	.disable_hub_initiated_lpm = 1,
+};
+
+/*
+ * TTY driver structures.
+ */
+
+static const struct tty_operations acm_ops = {
+	.install =		acm_tty_install,
+	.open =			acm_tty_open,
+	.close =		acm_tty_close,
+	.cleanup =		acm_tty_cleanup,
+	.hangup =		acm_tty_hangup,
+	.write =		acm_tty_write,
+	.write_room =		acm_tty_write_room,
+	.ioctl =		acm_tty_ioctl,
+	.throttle =		acm_tty_throttle,
+	.unthrottle =		acm_tty_unthrottle,
+	.chars_in_buffer =	acm_tty_chars_in_buffer,
+	.break_ctl =		acm_tty_break_ctl,
+	.set_termios =		acm_tty_set_termios,
+	.tiocmget =		acm_tty_tiocmget,
+	.tiocmset =		acm_tty_tiocmset,
+	.get_serial =		get_serial_info,
+	.set_serial =		set_serial_info,
+	.get_icount =		acm_tty_get_icount,
+};
+
+/*
+ * Init / exit.
+ */
+
+static int __init acm_init(void)
+{
+	int retval;
+	acm_tty_driver = tty_alloc_driver(ACM_TTY_MINORS, TTY_DRIVER_REAL_RAW |
+			TTY_DRIVER_DYNAMIC_DEV);
+	if (IS_ERR(acm_tty_driver))
+		return PTR_ERR(acm_tty_driver);
+	acm_tty_driver->driver_name = "acm",
+	acm_tty_driver->name = "ttyACM",
+	acm_tty_driver->major = ACM_TTY_MAJOR,
+	acm_tty_driver->minor_start = 0,
+	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
+	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
+	acm_tty_driver->init_termios = tty_std_termios;
+	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
+								HUPCL | CLOCAL;
+	tty_set_operations(acm_tty_driver, &acm_ops);
+
+	retval = tty_register_driver(acm_tty_driver);
+	if (retval) {
+		tty_driver_kref_put(acm_tty_driver);
+		return retval;
+	}
+
+	retval = usb_register(&acm_driver);
+	if (retval) {
+		tty_unregister_driver(acm_tty_driver);
+		tty_driver_kref_put(acm_tty_driver);
+		return retval;
+	}
+
+	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
+
+	return 0;
+}
+
+static void __exit acm_exit(void)
+{
+	usb_deregister(&acm_driver);
+	tty_unregister_driver(acm_tty_driver);
+	tty_driver_kref_put(acm_tty_driver);
+	idr_destroy(&acm_minors);
+}
+
+module_init(acm_init);
+module_exit(acm_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);