cdc-acm.c 46.2 KB
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/*
 * cdc-acm.c
 *
 * Copyright (c) 1999 Armin Fuerst	<fuerst@in.tum.de>
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 * Copyright (c) 1999 Pavel Machek	<pavel@ucw.cz>
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 * Copyright (c) 1999 Johannes Erdfelt	<johannes@erdfelt.com>
 * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
 * Copyright (c) 2004 Oliver Neukum	<oliver@neukum.name>
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 * Copyright (c) 2005 David Kubicek	<dave@awk.cz>
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 *
 * USB Abstract Control Model driver for USB modems and ISDN adapters
 *
 * Sponsored by SuSE
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#undef DEBUG
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#undef VERBOSE_DEBUG
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#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
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#include <linux/serial.h>
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#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <asm/byteorder.h>
#include <asm/unaligned.h>
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#include <linux/list.h>
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#include "cdc-acm.h"

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#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek"
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#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 struct acm *acm_table[ACM_TTY_MINORS];

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static DEFINE_MUTEX(open_mutex);
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#define ACM_READY(acm)	(acm && acm->dev && acm->port.count)
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static const struct tty_port_operations acm_port_ops = {
};

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/*
 * Functions for ACM control messages.
 */

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static int acm_ctrl_msg(struct acm *acm, int request, int value,
							void *buf, int len)
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{
	int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
		request, USB_RT_ACM, value,
		acm->control->altsetting[0].desc.bInterfaceNumber,
		buf, len, 5000);
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	dev_dbg(&acm->control->dev,
			"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
			__func__, request, value, len, retval);
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	return retval < 0 ? retval : 0;
}

/* devices aren't required to support these requests.
 * the cdc acm descriptor tells whether they do...
 */
#define acm_set_control(acm, control) \
	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)

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/*
 * 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;

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	wbn = 0;
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	i = 0;
	for (;;) {
		wb = &acm->wb[wbn];
		if (!wb->use) {
			wb->use = 1;
			return wbn;
		}
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		wbn = (wbn + 1) % ACM_NW;
		if (++i >= ACM_NW)
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			return -1;
	}
}

static int acm_wb_is_avail(struct acm *acm)
{
	int i, n;
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	unsigned long flags;
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	n = ACM_NW;
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	spin_lock_irqsave(&acm->write_lock, flags);
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	for (i = 0; i < ACM_NW; i++)
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		n -= acm->wb[i].use;
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	spin_unlock_irqrestore(&acm->write_lock, flags);
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	return n;
}

/*
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 * Finish write. Caller must hold acm->write_lock
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 */
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static void acm_write_done(struct acm *acm, struct acm_wb *wb)
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{
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	wb->use = 0;
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	acm->transmitting--;
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	usb_autopm_put_interface_async(acm->control);
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}

/*
 * Poke write.
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 *
 * the caller is responsible for locking
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 */
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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;

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	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
	if (rc < 0) {
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		dev_err(&acm->data->dev,
			"%s - usb_submit_urb(write bulk) failed: %d\n",
			__func__, rc);
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		acm_write_done(acm, wb);
	}
	return rc;
}

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static int acm_write_start(struct acm *acm, int wbn)
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{
	unsigned long flags;
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	struct acm_wb *wb = &acm->wb[wbn];
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	int rc;

	spin_lock_irqsave(&acm->write_lock, flags);
	if (!acm->dev) {
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		wb->use = 0;
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		spin_unlock_irqrestore(&acm->write_lock, flags);
		return -ENODEV;
	}

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	dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
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							acm->susp_count);
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	usb_autopm_get_interface_async(acm->control);
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	if (acm->susp_count) {
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		if (!acm->delayed_wb)
			acm->delayed_wb = wb;
		else
			usb_autopm_put_interface_async(acm->control);
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		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;	/* A white lie */
	}
	usb_mark_last_busy(acm->dev);

	rc = acm_start_wb(acm, wb);
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	spin_unlock_irqrestore(&acm->write_lock, flags);

	return rc;
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}
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/*
 * attributes exported through sysfs
 */
static ssize_t show_caps
(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(bmCapabilities, S_IRUGO, show_caps, NULL);

static ssize_t show_country_codes
(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(wCountryCodes, S_IRUGO, show_country_codes, NULL);

static ssize_t show_country_rel_date
(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);
}
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static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
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/*
 * Interrupt handlers for various ACM device responses
 */

/* control interface reports status changes with "interrupt" transfers */
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static void acm_ctrl_irq(struct urb *urb)
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{
	struct acm *acm = urb->context;
	struct usb_cdc_notification *dr = urb->transfer_buffer;
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	struct tty_struct *tty;
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	unsigned char *data;
	int newctrl;
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	int retval;
	int status = urb->status;
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	switch (status) {
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	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
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		dev_dbg(&acm->control->dev,
				"%s - urb shutting down with status: %d\n",
				__func__, status);
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		return;
	default:
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		dev_dbg(&acm->control->dev,
				"%s - nonzero urb status received: %d\n",
				__func__, status);
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		goto exit;
	}

	if (!ACM_READY(acm))
		goto exit;

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	usb_mark_last_busy(acm->dev);

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	data = (unsigned char *)(dr + 1);
	switch (dr->bNotificationType) {
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	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
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		dev_dbg(&acm->control->dev, "%s - network connection: %d\n",
							__func__, dr->wValue);
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		break;
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	case USB_CDC_NOTIFY_SERIAL_STATE:
		tty = tty_port_tty_get(&acm->port);
		newctrl = get_unaligned_le16(data);
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		if (tty) {
			if (!acm->clocal &&
				(acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
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				dev_dbg(&acm->control->dev,
					"%s - calling hangup\n", __func__);
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				tty_hangup(tty);
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			}
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			tty_kref_put(tty);
		}
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		acm->ctrlin = newctrl;
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		dev_dbg(&acm->control->dev,
			"%s - input control lines: dcd%c dsr%c break%c "
			"ring%c framing%c parity%c overrun%c\n",
			__func__,
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			acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
			acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
			acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
			acm->ctrlin & ACM_CTRL_RI  ? '+' : '-',
			acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
			acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
			acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
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			break;

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	default:
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		dev_dbg(&acm->control->dev,
			"%s - unknown notification %d received: index %d "
			"len %d data0 %d data1 %d\n",
			__func__,
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			dr->bNotificationType, dr->wIndex,
			dr->wLength, data[0], data[1]);
		break;
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	}
exit:
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	retval = usb_submit_urb(urb, GFP_ATOMIC);
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	if (retval)
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		dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
							__func__, retval);
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}

/* data interface returns incoming bytes, or we got unthrottled */
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static void acm_read_bulk(struct urb *urb)
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{
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	struct acm_rb *buf;
	struct acm_ru *rcv = urb->context;
	struct acm *acm = rcv->instance;
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	int status = urb->status;
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	dev_vdbg(&acm->data->dev, "%s - status %d\n", __func__, status);
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	if (!ACM_READY(acm)) {
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		dev_dbg(&acm->data->dev, "%s - acm not ready\n", __func__);
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		return;
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	}
	usb_mark_last_busy(acm->dev);
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	if (status)
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		dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
							__func__, status);
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	buf = rcv->buffer;
	buf->size = urb->actual_length;

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	if (likely(status == 0)) {
		spin_lock(&acm->read_lock);
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		acm->processing++;
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		list_add_tail(&rcv->list, &acm->spare_read_urbs);
		list_add_tail(&buf->list, &acm->filled_read_bufs);
		spin_unlock(&acm->read_lock);
	} else {
		/* we drop the buffer due to an error */
		spin_lock(&acm->read_lock);
		list_add_tail(&rcv->list, &acm->spare_read_urbs);
		list_add(&buf->list, &acm->spare_read_bufs);
		spin_unlock(&acm->read_lock);
		/* nevertheless the tasklet must be kicked unconditionally
		so the queue cannot dry up */
	}
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	if (likely(!acm->susp_count))
		tasklet_schedule(&acm->urb_task);
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}

static void acm_rx_tasklet(unsigned long _acm)
{
	struct acm *acm = (void *)_acm;
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	struct acm_rb *buf;
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	struct tty_struct *tty;
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	struct acm_ru *rcv;
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	unsigned long flags;
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	unsigned char throttled;
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	dev_vdbg(&acm->data->dev, "%s\n", __func__);
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	if (!ACM_READY(acm)) {
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		dev_dbg(&acm->data->dev, "%s - acm not ready\n", __func__);
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		return;
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	}
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	spin_lock_irqsave(&acm->throttle_lock, flags);
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	throttled = acm->throttle;
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	spin_unlock_irqrestore(&acm->throttle_lock, flags);
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	if (throttled) {
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		dev_dbg(&acm->data->dev, "%s - throttled\n", __func__);
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		return;
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	}
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	tty = tty_port_tty_get(&acm->port);

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next_buffer:
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	spin_lock_irqsave(&acm->read_lock, flags);
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	if (list_empty(&acm->filled_read_bufs)) {
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		spin_unlock_irqrestore(&acm->read_lock, flags);
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		goto urbs;
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	}
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	buf = list_entry(acm->filled_read_bufs.next,
			 struct acm_rb, list);
	list_del(&buf->list);
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	spin_unlock_irqrestore(&acm->read_lock, flags);
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	dev_vdbg(&acm->data->dev, "%s - processing buf 0x%p, size = %d\n",
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						__func__, buf, buf->size);
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	if (tty) {
		spin_lock_irqsave(&acm->throttle_lock, flags);
		throttled = acm->throttle;
		spin_unlock_irqrestore(&acm->throttle_lock, flags);
		if (!throttled) {
			tty_insert_flip_string(tty, buf->base, buf->size);
			tty_flip_buffer_push(tty);
		} else {
			tty_kref_put(tty);
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			dev_dbg(&acm->data->dev, "%s - throttling noticed\n",
								__func__);
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			spin_lock_irqsave(&acm->read_lock, flags);
			list_add(&buf->list, &acm->filled_read_bufs);
			spin_unlock_irqrestore(&acm->read_lock, flags);
			return;
		}
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	}

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	spin_lock_irqsave(&acm->read_lock, flags);
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	list_add(&buf->list, &acm->spare_read_bufs);
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	spin_unlock_irqrestore(&acm->read_lock, flags);
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	goto next_buffer;

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	tty_kref_put(tty);

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	while (!list_empty(&acm->spare_read_bufs)) {
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		spin_lock_irqsave(&acm->read_lock, flags);
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		if (list_empty(&acm->spare_read_urbs)) {
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			acm->processing = 0;
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			spin_unlock_irqrestore(&acm->read_lock, flags);
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			return;
		}
		rcv = list_entry(acm->spare_read_urbs.next,
				 struct acm_ru, list);
		list_del(&rcv->list);
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		spin_unlock_irqrestore(&acm->read_lock, flags);
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		buf = list_entry(acm->spare_read_bufs.next,
				 struct acm_rb, list);
		list_del(&buf->list);

		rcv->buffer = buf;

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		if (acm->is_int_ep)
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			usb_fill_int_urb(rcv->urb, acm->dev,
					 acm->rx_endpoint,
					 buf->base,
					 acm->readsize,
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					 acm_read_bulk, rcv, acm->bInterval);
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		else
			usb_fill_bulk_urb(rcv->urb, acm->dev,
					  acm->rx_endpoint,
					  buf->base,
					  acm->readsize,
					  acm_read_bulk, rcv);
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		rcv->urb->transfer_dma = buf->dma;
		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

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		/* This shouldn't kill the driver as unsuccessful URBs are
		   returned to the free-urbs-pool and resubmited ASAP */
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		spin_lock_irqsave(&acm->read_lock, flags);
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		if (acm->susp_count ||
				usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
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			list_add(&buf->list, &acm->spare_read_bufs);
			list_add(&rcv->list, &acm->spare_read_urbs);
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			acm->processing = 0;
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			spin_unlock_irqrestore(&acm->read_lock, flags);
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			return;
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		} else {
			spin_unlock_irqrestore(&acm->read_lock, flags);
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			dev_vdbg(&acm->data->dev,
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				"%s - sending urb 0x%p, rcv 0x%p, buf 0x%p\n",
				__func__, rcv->urb, rcv, buf);
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		}
	}
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	spin_lock_irqsave(&acm->read_lock, flags);
	acm->processing = 0;
	spin_unlock_irqrestore(&acm->read_lock, flags);
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}

/* data interface wrote those outgoing bytes */
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static void acm_write_bulk(struct urb *urb)
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{
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	struct acm_wb *wb = urb->context;
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	struct acm *acm = wb->instance;
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	unsigned long flags;
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	if (urb->status	|| (urb->actual_length != urb->transfer_buffer_length))
		dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
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			__func__,
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			urb->actual_length,
			urb->transfer_buffer_length,
			urb->status);
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	spin_lock_irqsave(&acm->write_lock, flags);
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	acm_write_done(acm, wb);
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	spin_unlock_irqrestore(&acm->write_lock, flags);
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	if (ACM_READY(acm))
		schedule_work(&acm->work);
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}

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static void acm_softint(struct work_struct *work)
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{
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	struct acm *acm = container_of(work, struct acm, work);
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	struct tty_struct *tty;
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	dev_vdbg(&acm->data->dev, "%s\n", __func__);

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	if (!ACM_READY(acm))
		return;
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	tty = tty_port_tty_get(&acm->port);
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	if (!tty)
		return;
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	tty_wakeup(tty);
	tty_kref_put(tty);
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}

/*
 * TTY handlers
 */

static int acm_tty_open(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm;
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	int rv = -ENODEV;
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	int i;
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	mutex_lock(&open_mutex);
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	acm = acm_table[tty->index];
	if (!acm || !acm->dev)
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		goto out;
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	else
		rv = 0;

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	dev_dbg(&acm->control->dev, "%s\n", __func__);

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	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
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	tty->driver_data = acm;
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	tty_port_tty_set(&acm->port, tty);
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	if (usb_autopm_get_interface(acm->control) < 0)
		goto early_bail;
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	else
		acm->control->needs_remote_wakeup = 1;
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	mutex_lock(&acm->mutex);
A
Alan Cox 已提交
556
	if (acm->port.count++) {
557
		mutex_unlock(&acm->mutex);
O
Oliver Neukum 已提交
558
		usb_autopm_put_interface(acm->control);
559
		goto out;
A
Alan Cox 已提交
560
	}
O
Oliver Neukum 已提交
561

L
Linus Torvalds 已提交
562 563
	acm->ctrlurb->dev = acm->dev;
	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
564 565
		dev_err(&acm->control->dev,
			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
L
Linus Torvalds 已提交
566 567 568
		goto bail_out;
	}

569 570
	if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
571
		goto bail_out;
A
Alan Cox 已提交
572

573
	usb_autopm_put_interface(acm->control);
L
Linus Torvalds 已提交
574

575 576 577
	INIT_LIST_HEAD(&acm->spare_read_urbs);
	INIT_LIST_HEAD(&acm->spare_read_bufs);
	INIT_LIST_HEAD(&acm->filled_read_bufs);
578 579

	for (i = 0; i < acm->rx_buflimit; i++)
580
		list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
581
	for (i = 0; i < acm->rx_buflimit; i++)
582 583
		list_add(&(acm->rb[i].list), &acm->spare_read_bufs);

584 585
	acm->throttle = 0;

586
	set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
A
Alan Cox 已提交
587
	rv = tty_port_block_til_ready(&acm->port, tty, filp);
588
	tasklet_schedule(&acm->urb_task);
589

O
Oliver Neukum 已提交
590
	mutex_unlock(&acm->mutex);
591
out:
592
	mutex_unlock(&open_mutex);
L
Linus Torvalds 已提交
593 594 595
	return rv;

bail_out:
A
Alan Cox 已提交
596
	acm->port.count--;
O
Oliver Neukum 已提交
597
	mutex_unlock(&acm->mutex);
598
	usb_autopm_put_interface(acm->control);
599 600
early_bail:
	mutex_unlock(&open_mutex);
A
Alan Cox 已提交
601
	tty_port_tty_set(&acm->port, NULL);
L
Linus Torvalds 已提交
602 603 604
	return -EIO;
}

605 606
static void acm_tty_unregister(struct acm *acm)
{
607
	int i;
608

609 610 611 612
	tty_unregister_device(acm_tty_driver, acm->minor);
	usb_put_intf(acm->control);
	acm_table[acm->minor] = NULL;
	usb_free_urb(acm->ctrlurb);
613 614
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
615
	for (i = 0; i < acm->rx_buflimit; i++)
616
		usb_free_urb(acm->ru[i].urb);
617
	kfree(acm->country_codes);
618 619 620
	kfree(acm);
}

A
Arnd Bergmann 已提交
621
static void acm_port_down(struct acm *acm)
A
Alan Cox 已提交
622
{
623 624
	int i;

A
Alan Cox 已提交
625 626 627 628 629 630 631
	mutex_lock(&open_mutex);
	if (acm->dev) {
		usb_autopm_get_interface(acm->control);
		acm_set_control(acm, acm->ctrlout = 0);
		usb_kill_urb(acm->ctrlurb);
		for (i = 0; i < ACM_NW; i++)
			usb_kill_urb(acm->wb[i].urb);
632
		tasklet_disable(&acm->urb_task);
633
		for (i = 0; i < acm->rx_buflimit; i++)
A
Alan Cox 已提交
634
			usb_kill_urb(acm->ru[i].urb);
635
		tasklet_enable(&acm->urb_task);
A
Alan Cox 已提交
636 637 638 639 640 641 642 643 644 645
		acm->control->needs_remote_wakeup = 0;
		usb_autopm_put_interface(acm->control);
	}
	mutex_unlock(&open_mutex);
}

static void acm_tty_hangup(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	tty_port_hangup(&acm->port);
A
Arnd Bergmann 已提交
646
	acm_port_down(acm);
A
Alan Cox 已提交
647 648
}

L
Linus Torvalds 已提交
649 650 651 652
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;

A
Alan Cox 已提交
653 654
	/* Perform the closing process and see if we need to do the hardware
	   shutdown */
655
	if (!acm)
L
Linus Torvalds 已提交
656
		return;
657 658 659 660 661 662 663 664 665 666
	if (tty_port_close_start(&acm->port, tty, filp) == 0) {
		mutex_lock(&open_mutex);
		if (!acm->dev) {
			tty_port_tty_set(&acm->port, NULL);
			acm_tty_unregister(acm);
			tty->driver_data = NULL;
		}
		mutex_unlock(&open_mutex);
		return;
	}
A
Arnd Bergmann 已提交
667
	acm_port_down(acm);
A
Alan Cox 已提交
668 669
	tty_port_close_end(&acm->port, tty);
	tty_port_tty_set(&acm->port, NULL);
L
Linus Torvalds 已提交
670 671
}

672 673
static int acm_tty_write(struct tty_struct *tty,
					const unsigned char *buf, int count)
L
Linus Torvalds 已提交
674 675 676
{
	struct acm *acm = tty->driver_data;
	int stat;
677 678 679 680
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;

L
Linus Torvalds 已提交
681 682 683 684 685
	if (!ACM_READY(acm))
		return -EINVAL;
	if (!count)
		return 0;

686
	dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
687

688
	spin_lock_irqsave(&acm->write_lock, flags);
689 690
	wbn = acm_wb_alloc(acm);
	if (wbn < 0) {
691 692 693 694
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];
L
Linus Torvalds 已提交
695

696
	count = (count > acm->writesize) ? acm->writesize : count;
697
	dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
698 699 700
	memcpy(wb->buf, buf, count);
	wb->len = count;
	spin_unlock_irqrestore(&acm->write_lock, flags);
L
Linus Torvalds 已提交
701

702 703
	stat = acm_write_start(acm, wbn);
	if (stat < 0)
L
Linus Torvalds 已提交
704 705 706 707 708 709 710 711 712
		return stat;
	return count;
}

static int acm_tty_write_room(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return -EINVAL;
713 714 715 716
	/*
	 * Do not let the line discipline to know that we have a reserve,
	 * or it might get too enthusiastic.
	 */
717
	return acm_wb_is_avail(acm) ? acm->writesize : 0;
L
Linus Torvalds 已提交
718 719 720 721 722 723
}

static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
A
Alan Cox 已提交
724
		return 0;
725 726 727
	/*
	 * This is inaccurate (overcounts), but it works.
	 */
728
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
L
Linus Torvalds 已提交
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748
}

static void acm_tty_throttle(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return;
	spin_lock_bh(&acm->throttle_lock);
	acm->throttle = 1;
	spin_unlock_bh(&acm->throttle_lock);
}

static void acm_tty_unthrottle(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return;
	spin_lock_bh(&acm->throttle_lock);
	acm->throttle = 0;
	spin_unlock_bh(&acm->throttle_lock);
749
	tasklet_schedule(&acm->urb_task);
L
Linus Torvalds 已提交
750 751
}

A
Alan Cox 已提交
752
static int acm_tty_break_ctl(struct tty_struct *tty, int state)
L
Linus Torvalds 已提交
753 754
{
	struct acm *acm = tty->driver_data;
A
Alan Cox 已提交
755
	int retval;
L
Linus Torvalds 已提交
756
	if (!ACM_READY(acm))
A
Alan Cox 已提交
757 758 759
		return -EINVAL;
	retval = acm_send_break(acm, state ? 0xffff : 0);
	if (retval < 0)
760 761
		dev_dbg(&acm->control->dev, "%s - send break failed\n",
								__func__);
A
Alan Cox 已提交
762
	return retval;
L
Linus Torvalds 已提交
763 764
}

765
static int acm_tty_tiocmget(struct tty_struct *tty)
L
Linus Torvalds 已提交
766 767 768 769 770 771 772 773 774 775 776 777 778 779
{
	struct acm *acm = tty->driver_data;

	if (!ACM_READY(acm))
		return -EINVAL;

	return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
	       (acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
	       (acm->ctrlin  & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
	       (acm->ctrlin  & ACM_CTRL_RI  ? TIOCM_RI  : 0) |
	       (acm->ctrlin  & ACM_CTRL_DCD ? TIOCM_CD  : 0) |
	       TIOCM_CTS;
}

780
static int acm_tty_tiocmset(struct tty_struct *tty,
L
Linus Torvalds 已提交
781 782 783 784 785 786 787 788 789
			    unsigned int set, unsigned int clear)
{
	struct acm *acm = tty->driver_data;
	unsigned int newctrl;

	if (!ACM_READY(acm))
		return -EINVAL;

	newctrl = acm->ctrlout;
790 791 792 793
	set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
					(set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
	clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
					(clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
L
Linus Torvalds 已提交
794 795 796 797 798 799 800 801

	newctrl = (newctrl & ~clear) | set;

	if (acm->ctrlout == newctrl)
		return 0;
	return acm_set_control(acm, acm->ctrlout = newctrl);
}

802
static int acm_tty_ioctl(struct tty_struct *tty,
803
					unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
804 805 806 807 808 809 810 811 812
{
	struct acm *acm = tty->driver_data;

	if (!ACM_READY(acm))
		return -EINVAL;

	return -ENOIOCTLCMD;
}

813
static const __u32 acm_tty_speed[] = {
L
Linus Torvalds 已提交
814 815 816 817 818 819 820
	0, 50, 75, 110, 134, 150, 200, 300, 600,
	1200, 1800, 2400, 4800, 9600, 19200, 38400,
	57600, 115200, 230400, 460800, 500000, 576000,
	921600, 1000000, 1152000, 1500000, 2000000,
	2500000, 3000000, 3500000, 4000000
};

821
static const __u8 acm_tty_size[] = {
L
Linus Torvalds 已提交
822 823 824
	5, 6, 7, 8
};

825 826
static void acm_tty_set_termios(struct tty_struct *tty,
						struct ktermios *termios_old)
L
Linus Torvalds 已提交
827 828
{
	struct acm *acm = tty->driver_data;
A
Alan Cox 已提交
829
	struct ktermios *termios = tty->termios;
L
Linus Torvalds 已提交
830 831 832 833 834 835
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	if (!ACM_READY(acm))
		return;

836
	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
L
Linus Torvalds 已提交
837 838
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
839 840
				(termios->c_cflag & PARODD ? 1 : 2) +
				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
L
Linus Torvalds 已提交
841
	newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
842
	/* FIXME: Needs to clear unsupported bits in the termios */
L
Linus Torvalds 已提交
843 844 845 846 847
	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (!newline.dwDTERate) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
848 849
	} else
		newctrl |=  ACM_CTRL_DTR;
L
Linus Torvalds 已提交
850 851 852 853 854 855

	if (newctrl != acm->ctrlout)
		acm_set_control(acm, acm->ctrlout = newctrl);

	if (memcmp(&acm->line, &newline, sizeof newline)) {
		memcpy(&acm->line, &newline, sizeof newline);
856 857 858
		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
			__func__,
			le32_to_cpu(newline.dwDTERate),
L
Linus Torvalds 已提交
859 860 861 862 863 864 865 866 867 868
			newline.bCharFormat, newline.bParityType,
			newline.bDataBits);
		acm_set_line(acm, &acm->line);
	}
}

/*
 * USB probe and disconnect routines.
 */

869
/* Little helpers: write/read buffers free */
870 871 872 873
static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;
O
Oliver Neukum 已提交
874
	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
875

876
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
877
		usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
878 879
}

880 881 882
static void acm_read_buffers_free(struct acm *acm)
{
	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
883
	int i;
884

885
	for (i = 0; i < acm->rx_buflimit; i++)
886 887
		usb_free_coherent(usb_dev, acm->readsize,
				  acm->rb[i].base, acm->rb[i].dma);
888 889
}

890 891 892 893 894 895
/* Little helper: write buffers allocate */
static int acm_write_buffers_alloc(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

896
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
897
		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
898 899 900 901 902
		    &wb->dmah);
		if (!wb->buf) {
			while (i != 0) {
				--i;
				--wb;
903
				usb_free_coherent(acm->dev, acm->writesize,
904 905 906 907 908 909 910 911
				    wb->buf, wb->dmah);
			}
			return -ENOMEM;
		}
	}
	return 0;
}

A
Alan Cox 已提交
912 913
static int acm_probe(struct usb_interface *intf,
		     const struct usb_device_id *id)
L
Linus Torvalds 已提交
914 915
{
	struct usb_cdc_union_desc *union_header = NULL;
916
	struct usb_cdc_country_functional_desc *cfd = NULL;
D
David Brownell 已提交
917
	unsigned char *buffer = intf->altsetting->extra;
L
Linus Torvalds 已提交
918 919 920
	int buflen = intf->altsetting->extralen;
	struct usb_interface *control_interface;
	struct usb_interface *data_interface;
921 922 923
	struct usb_endpoint_descriptor *epctrl = NULL;
	struct usb_endpoint_descriptor *epread = NULL;
	struct usb_endpoint_descriptor *epwrite = NULL;
L
Linus Torvalds 已提交
924 925 926
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct acm *acm;
	int minor;
927
	int ctrlsize, readsize;
L
Linus Torvalds 已提交
928 929 930 931 932 933
	u8 *buf;
	u8 ac_management_function = 0;
	u8 call_management_function = 0;
	int call_interface_num = -1;
	int data_interface_num;
	unsigned long quirks;
934
	int num_rx_buf;
935
	int i;
936
	int combined_interfaces = 0;
L
Linus Torvalds 已提交
937

938
	/* normal quirks */
L
Linus Torvalds 已提交
939
	quirks = (unsigned long)id->driver_info;
940 941 942
	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
L
Linus Torvalds 已提交
943 944 945 946 947
	if (quirks == NO_UNION_NORMAL) {
		data_interface = usb_ifnum_to_if(usb_dev, 1);
		control_interface = usb_ifnum_to_if(usb_dev, 0);
		goto skip_normal_probe;
	}
948

L
Linus Torvalds 已提交
949 950
	/* normal probing*/
	if (!buffer) {
951
		dev_err(&intf->dev, "Weird descriptor references\n");
L
Linus Torvalds 已提交
952 953 954 955
		return -EINVAL;
	}

	if (!buflen) {
956 957
		if (intf->cur_altsetting->endpoint &&
				intf->cur_altsetting->endpoint->extralen &&
958 959 960
				intf->cur_altsetting->endpoint->extra) {
			dev_dbg(&intf->dev,
				"Seeking extra descriptors on endpoint\n");
L
Linus Torvalds 已提交
961 962 963
			buflen = intf->cur_altsetting->endpoint->extralen;
			buffer = intf->cur_altsetting->endpoint->extra;
		} else {
964 965
			dev_err(&intf->dev,
				"Zero length descriptor references\n");
L
Linus Torvalds 已提交
966 967 968 969 970
			return -EINVAL;
		}
	}

	while (buflen > 0) {
971
		if (buffer[1] != USB_DT_CS_INTERFACE) {
972
			dev_err(&intf->dev, "skipping garbage\n");
L
Linus Torvalds 已提交
973 974 975
			goto next_desc;
		}

976 977 978 979 980 981
		switch (buffer[2]) {
		case USB_CDC_UNION_TYPE: /* we've found it */
			if (union_header) {
				dev_err(&intf->dev, "More than one "
					"union descriptor, skipping ...\n");
				goto next_desc;
L
Linus Torvalds 已提交
982
			}
983 984 985 986 987 988 989 990 991 992 993 994 995
			union_header = (struct usb_cdc_union_desc *)buffer;
			break;
		case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
			cfd = (struct usb_cdc_country_functional_desc *)buffer;
			break;
		case USB_CDC_HEADER_TYPE: /* maybe check version */
			break; /* for now we ignore it */
		case USB_CDC_ACM_TYPE:
			ac_management_function = buffer[3];
			break;
		case USB_CDC_CALL_MANAGEMENT_TYPE:
			call_management_function = buffer[3];
			call_interface_num = buffer[4];
996
			if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
				dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
			break;
		default:
			/* there are LOTS more CDC descriptors that
			 * could legitimately be found here.
			 */
			dev_dbg(&intf->dev, "Ignoring descriptor: "
					"type %02x, length %d\n",
					buffer[2], buffer[0]);
			break;
		}
L
Linus Torvalds 已提交
1008 1009 1010 1011 1012 1013 1014
next_desc:
		buflen -= buffer[0];
		buffer += buffer[0];
	}

	if (!union_header) {
		if (call_interface_num > 0) {
1015
			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
L
Linus Torvalds 已提交
1016 1017 1018
			data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
			control_interface = intf;
		} else {
1019 1020 1021 1022 1023 1024 1025 1026 1027
			if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
				dev_dbg(&intf->dev,"No union descriptor, giving up\n");
				return -ENODEV;
			} else {
				dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
				combined_interfaces = 1;
				control_interface = data_interface = intf;
				goto look_for_collapsed_interface;
			}
L
Linus Torvalds 已提交
1028 1029 1030 1031 1032
		}
	} else {
		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
		data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
		if (!control_interface || !data_interface) {
1033
			dev_dbg(&intf->dev, "no interfaces\n");
L
Linus Torvalds 已提交
1034 1035 1036
			return -ENODEV;
		}
	}
1037

L
Linus Torvalds 已提交
1038
	if (data_interface_num != call_interface_num)
1039
		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
L
Linus Torvalds 已提交
1040

1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
	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:
		for (i = 0; i < 3; i++) {
			struct usb_endpoint_descriptor *ep;
			ep = &data_interface->cur_altsetting->endpoint[i].desc;

			if (usb_endpoint_is_int_in(ep))
				epctrl = ep;
			else if (usb_endpoint_is_bulk_out(ep))
				epwrite = ep;
			else if (usb_endpoint_is_bulk_in(ep))
				epread = ep;
			else
				return -EINVAL;
		}
		if (!epctrl || !epread || !epwrite)
			return -ENODEV;
		else
			goto made_compressed_probe;
	}

L
Linus Torvalds 已提交
1071 1072 1073
skip_normal_probe:

	/*workaround for switched interfaces */
1074 1075 1076 1077
	if (data_interface->cur_altsetting->desc.bInterfaceClass
						!= CDC_DATA_INTERFACE_TYPE) {
		if (control_interface->cur_altsetting->desc.bInterfaceClass
						== CDC_DATA_INTERFACE_TYPE) {
L
Linus Torvalds 已提交
1078
			struct usb_interface *t;
1079 1080
			dev_dbg(&intf->dev,
				"Your device has switched interfaces.\n");
L
Linus Torvalds 已提交
1081 1082 1083 1084 1085 1086 1087
			t = control_interface;
			control_interface = data_interface;
			data_interface = t;
		} else {
			return -EINVAL;
		}
	}
1088 1089

	/* Accept probe requests only for the control interface */
1090
	if (!combined_interfaces && intf != control_interface)
1091
		return -ENODEV;
1092

1093 1094
	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
		/* valid in this context */
1095
		dev_dbg(&intf->dev, "The data interface isn't available\n");
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
		return -EBUSY;
	}


	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2)
		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 */
1109
	if (!usb_endpoint_dir_in(epread)) {
L
Linus Torvalds 已提交
1110 1111
		/* descriptors are swapped */
		struct usb_endpoint_descriptor *t;
1112 1113
		dev_dbg(&intf->dev,
			"The data interface has switched endpoints\n");
L
Linus Torvalds 已提交
1114 1115 1116 1117
		t = epread;
		epread = epwrite;
		epwrite = t;
	}
1118
made_compressed_probe:
1119
	dev_dbg(&intf->dev, "interfaces are valid\n");
L
Linus Torvalds 已提交
1120 1121 1122
	for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);

	if (minor == ACM_TTY_MINORS) {
1123
		dev_err(&intf->dev, "no more free acm devices\n");
L
Linus Torvalds 已提交
1124 1125 1126
		return -ENODEV;
	}

1127 1128
	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
	if (acm == NULL) {
1129
		dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
L
Linus Torvalds 已提交
1130 1131 1132 1133
		goto alloc_fail;
	}

	ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
1134 1135
	readsize = le16_to_cpu(epread->wMaxPacketSize) *
				(quirks == SINGLE_RX_URB ? 1 : 2);
1136
	acm->combined_interfaces = combined_interfaces;
1137
	acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
L
Linus Torvalds 已提交
1138 1139 1140 1141 1142
	acm->control = control_interface;
	acm->data = data_interface;
	acm->minor = minor;
	acm->dev = usb_dev;
	acm->ctrl_caps = ac_management_function;
1143 1144
	if (quirks & NO_CAP_LINE)
		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
L
Linus Torvalds 已提交
1145 1146
	acm->ctrlsize = ctrlsize;
	acm->readsize = readsize;
1147
	acm->rx_buflimit = num_rx_buf;
1148 1149
	acm->urb_task.func = acm_rx_tasklet;
	acm->urb_task.data = (unsigned long) acm;
D
David Howells 已提交
1150
	INIT_WORK(&acm->work, acm_softint);
L
Linus Torvalds 已提交
1151
	spin_lock_init(&acm->throttle_lock);
1152
	spin_lock_init(&acm->write_lock);
1153
	spin_lock_init(&acm->read_lock);
O
Oliver Neukum 已提交
1154
	mutex_init(&acm->mutex);
1155
	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1156 1157 1158
	acm->is_int_ep = usb_endpoint_xfer_int(epread);
	if (acm->is_int_ep)
		acm->bInterval = epread->bInterval;
A
Alan Cox 已提交
1159 1160
	tty_port_init(&acm->port);
	acm->port.ops = &acm_port_ops;
L
Linus Torvalds 已提交
1161

1162
	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
L
Linus Torvalds 已提交
1163
	if (!buf) {
1164
		dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
L
Linus Torvalds 已提交
1165 1166 1167 1168
		goto alloc_fail2;
	}
	acm->ctrl_buffer = buf;

1169
	if (acm_write_buffers_alloc(acm) < 0) {
1170
		dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
L
Linus Torvalds 已提交
1171 1172 1173 1174 1175
		goto alloc_fail4;
	}

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb) {
1176
		dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
L
Linus Torvalds 已提交
1177 1178
		goto alloc_fail5;
	}
1179
	for (i = 0; i < num_rx_buf; i++) {
1180 1181
		struct acm_ru *rcv = &(acm->ru[i]);

1182 1183
		rcv->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (rcv->urb == NULL) {
1184
			dev_err(&intf->dev,
1185
				"out of memory (read urbs usb_alloc_urb)\n");
1186
			goto alloc_fail6;
1187 1188 1189 1190 1191
		}

		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		rcv->instance = acm;
	}
1192
	for (i = 0; i < num_rx_buf; i++) {
D
David Brownell 已提交
1193
		struct acm_rb *rb = &(acm->rb[i]);
1194

1195
		rb->base = usb_alloc_coherent(acm->dev, readsize,
D
David Brownell 已提交
1196 1197
				GFP_KERNEL, &rb->dma);
		if (!rb->base) {
1198
			dev_err(&intf->dev,
1199
				"out of memory (read bufs usb_alloc_coherent)\n");
1200 1201
			goto alloc_fail7;
		}
L
Linus Torvalds 已提交
1202
	}
1203
	for (i = 0; i < ACM_NW; i++) {
1204 1205
		struct acm_wb *snd = &(acm->wb[i]);

1206 1207
		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (snd->urb == NULL) {
1208
			dev_err(&intf->dev,
1209
				"out of memory (write urbs usb_alloc_urb)\n");
1210
			goto alloc_fail8;
1211 1212
		}

1213 1214 1215 1216 1217 1218 1219 1220
		if (usb_endpoint_xfer_int(epwrite))
			usb_fill_int_urb(snd->urb, usb_dev,
				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
		else
			usb_fill_bulk_urb(snd->urb, usb_dev,
				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
				NULL, acm->writesize, acm_write_bulk, snd);
1221 1222
		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		snd->instance = acm;
L
Linus Torvalds 已提交
1223 1224
	}

1225
	usb_set_intfdata(intf, acm);
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235

	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
	if (i < 0)
		goto alloc_fail8;

	if (cfd) { /* export the country data */
		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
		if (!acm->country_codes)
			goto skip_countries;
		acm->country_code_size = cfd->bLength - 4;
1236 1237
		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
							cfd->bLength - 4);
1238 1239 1240 1241 1242 1243 1244 1245
		acm->country_rel_date = cfd->iCountryCodeRelDate;

		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
		if (i < 0) {
			kfree(acm->country_codes);
			goto skip_countries;
		}

1246 1247
		i = device_create_file(&intf->dev,
						&dev_attr_iCountryCodeRelDate);
1248
		if (i < 0) {
1249
			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1250 1251 1252 1253 1254 1255
			kfree(acm->country_codes);
			goto skip_countries;
		}
	}

skip_countries:
1256
	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1257 1258 1259 1260
			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
			 /* works around buggy devices */
			 epctrl->bInterval ? epctrl->bInterval : 0xff);
L
Linus Torvalds 已提交
1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	acm->ctrlurb->transfer_dma = acm->ctrl_dma;

	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);

	acm_set_control(acm, acm->ctrlout);

	acm->line.dwDTERate = cpu_to_le32(9600);
	acm->line.bDataBits = 8;
	acm_set_line(acm, &acm->line);

	usb_driver_claim_interface(&acm_driver, data_interface, acm);
D
David Brownell 已提交
1273
	usb_set_intfdata(data_interface, acm);
L
Linus Torvalds 已提交
1274

1275 1276
	usb_get_intf(control_interface);
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);
L
Linus Torvalds 已提交
1277 1278 1279

	acm_table[minor] = acm;

1280 1281
	return 0;
alloc_fail8:
1282 1283
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
L
Linus Torvalds 已提交
1284
alloc_fail7:
1285
	acm_read_buffers_free(acm);
1286
alloc_fail6:
1287
	for (i = 0; i < num_rx_buf; i++)
1288
		usb_free_urb(acm->ru[i].urb);
L
Linus Torvalds 已提交
1289 1290
	usb_free_urb(acm->ctrlurb);
alloc_fail5:
1291
	acm_write_buffers_free(acm);
L
Linus Torvalds 已提交
1292
alloc_fail4:
1293
	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
L
Linus Torvalds 已提交
1294 1295 1296 1297 1298 1299
alloc_fail2:
	kfree(acm);
alloc_fail:
	return -ENOMEM;
}

O
Oliver Neukum 已提交
1300 1301 1302
static void stop_data_traffic(struct acm *acm)
{
	int i;
1303 1304

	dev_dbg(&acm->control->dev, "%s\n", __func__);
O
Oliver Neukum 已提交
1305 1306 1307 1308

	tasklet_disable(&acm->urb_task);

	usb_kill_urb(acm->ctrlurb);
1309
	for (i = 0; i < ACM_NW; i++)
1310
		usb_kill_urb(acm->wb[i].urb);
O
Oliver Neukum 已提交
1311 1312 1313 1314 1315 1316 1317 1318
	for (i = 0; i < acm->rx_buflimit; i++)
		usb_kill_urb(acm->ru[i].urb);

	tasklet_enable(&acm->urb_task);

	cancel_work_sync(&acm->work);
}

L
Linus Torvalds 已提交
1319 1320
static void acm_disconnect(struct usb_interface *intf)
{
1321
	struct acm *acm = usb_get_intfdata(intf);
L
Linus Torvalds 已提交
1322
	struct usb_device *usb_dev = interface_to_usbdev(intf);
A
Alan Cox 已提交
1323
	struct tty_struct *tty;
L
Linus Torvalds 已提交
1324

D
David Brownell 已提交
1325 1326
	/* sibling interface is already cleaning up */
	if (!acm)
1327
		return;
D
David Brownell 已提交
1328 1329

	mutex_lock(&open_mutex);
1330
	if (acm->country_codes) {
1331 1332 1333 1334
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
1335
	}
1336
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
L
Linus Torvalds 已提交
1337
	acm->dev = NULL;
1338 1339
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
L
Linus Torvalds 已提交
1340

O
Oliver Neukum 已提交
1341
	stop_data_traffic(acm);
L
Linus Torvalds 已提交
1342

1343
	acm_write_buffers_free(acm);
1344 1345
	usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer,
			  acm->ctrl_dma);
1346
	acm_read_buffers_free(acm);
L
Linus Torvalds 已提交
1347

1348 1349
	if (!acm->combined_interfaces)
		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1350
					acm->data : acm->control);
L
Linus Torvalds 已提交
1351

A
Alan Cox 已提交
1352
	if (acm->port.count == 0) {
1353
		acm_tty_unregister(acm);
1354
		mutex_unlock(&open_mutex);
L
Linus Torvalds 已提交
1355 1356 1357
		return;
	}

1358
	mutex_unlock(&open_mutex);
A
Alan Cox 已提交
1359 1360 1361 1362 1363
	tty = tty_port_tty_get(&acm->port);
	if (tty) {
		tty_hangup(tty);
		tty_kref_put(tty);
	}
L
Linus Torvalds 已提交
1364 1365
}

1366
#ifdef CONFIG_PM
O
Oliver Neukum 已提交
1367 1368 1369
static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct acm *acm = usb_get_intfdata(intf);
1370 1371
	int cnt;

A
Alan Stern 已提交
1372
	if (message.event & PM_EVENT_AUTO) {
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
		int b;

		spin_lock_irq(&acm->read_lock);
		spin_lock(&acm->write_lock);
		b = acm->processing + acm->transmitting;
		spin_unlock(&acm->write_lock);
		spin_unlock_irq(&acm->read_lock);
		if (b)
			return -EBUSY;
	}

	spin_lock_irq(&acm->read_lock);
	spin_lock(&acm->write_lock);
	cnt = acm->susp_count++;
	spin_unlock(&acm->write_lock);
	spin_unlock_irq(&acm->read_lock);
O
Oliver Neukum 已提交
1389

1390
	if (cnt)
O
Oliver Neukum 已提交
1391 1392 1393 1394 1395 1396 1397
		return 0;
	/*
	we treat opened interfaces differently,
	we must guard against open
	*/
	mutex_lock(&acm->mutex);

A
Alan Cox 已提交
1398
	if (acm->port.count)
O
Oliver Neukum 已提交
1399 1400 1401 1402 1403 1404 1405 1406 1407
		stop_data_traffic(acm);

	mutex_unlock(&acm->mutex);
	return 0;
}

static int acm_resume(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);
1408
	struct acm_wb *wb;
O
Oliver Neukum 已提交
1409
	int rv = 0;
1410
	int cnt;
O
Oliver Neukum 已提交
1411

1412 1413 1414 1415 1416 1417
	spin_lock_irq(&acm->read_lock);
	acm->susp_count -= 1;
	cnt = acm->susp_count;
	spin_unlock_irq(&acm->read_lock);

	if (cnt)
O
Oliver Neukum 已提交
1418 1419 1420
		return 0;

	mutex_lock(&acm->mutex);
A
Alan Cox 已提交
1421
	if (acm->port.count) {
O
Oliver Neukum 已提交
1422
		rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1423 1424 1425 1426 1427 1428

		spin_lock_irq(&acm->write_lock);
		if (acm->delayed_wb) {
			wb = acm->delayed_wb;
			acm->delayed_wb = NULL;
			spin_unlock_irq(&acm->write_lock);
1429
			acm_start_wb(acm, wb);
1430 1431 1432 1433 1434 1435 1436 1437
		} else {
			spin_unlock_irq(&acm->write_lock);
		}

		/*
		 * delayed error checking because we must
		 * do the write path at all cost
		 */
O
Oliver Neukum 已提交
1438
		if (rv < 0)
1439
			goto err_out;
O
Oliver Neukum 已提交
1440 1441 1442 1443 1444 1445 1446 1447

		tasklet_schedule(&acm->urb_task);
	}

err_out:
	mutex_unlock(&acm->mutex);
	return rv;
}
1448

1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
static int acm_reset_resume(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);
	struct tty_struct *tty;

	mutex_lock(&acm->mutex);
	if (acm->port.count) {
		tty = tty_port_tty_get(&acm->port);
		if (tty) {
			tty_hangup(tty);
			tty_kref_put(tty);
		}
	}
	mutex_unlock(&acm->mutex);
	return acm_resume(intf);
}

1466
#endif /* CONFIG_PM */
1467 1468 1469 1470 1471 1472

#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)

1473 1474 1475 1476 1477
#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)

L
Linus Torvalds 已提交
1478 1479 1480 1481
/*
 * USB driver structure.
 */

1482
static const struct usb_device_id acm_ids[] = {
L
Linus Torvalds 已提交
1483 1484 1485 1486
	/* quirky and broken devices */
	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1487 1488 1489
	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
A
Andrew Lunn 已提交
1490 1491 1492
	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1493 1494 1495
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1496 1497 1498
	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
A
Alan Cox 已提交
1499 1500 1501
	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB,
	},
1502 1503 1504
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
1505 1506 1507
	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
O
Oliver Neukum 已提交
1508 1509 1510
	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1511 1512 1513
	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1514 1515 1516
	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1517 1518 1519
	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1520 1521 1522
	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1523 1524
	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
	},
1525 1526 1527 1528 1529 1530 1531
	{ 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. */
	},
1532 1533 1534
	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},
1535 1536 1537
	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},
O
Oliver Neukum 已提交
1538

1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
	/* 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(0x00e9), }, /* Nokia 5320 XpressMusic */
	{ 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 */
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	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
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	{ 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 */
1598
	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
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	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */
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	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */

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	/* Support Lego NXT using pbLua firmware */
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	{ USB_DEVICE(0x0694, 0xff00),
	.driver_info = NOT_A_MODEM,
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	},
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	/* control interfaces without any protocol set */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_PROTO_NONE) },

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	/* 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,
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		USB_CDC_ACM_PROTO_AT_3G) },
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	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_CDMA) },

	{ }
};

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MODULE_DEVICE_TABLE(usb, acm_ids);
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static struct usb_driver acm_driver = {
	.name =		"cdc_acm",
	.probe =	acm_probe,
	.disconnect =	acm_disconnect,
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#ifdef CONFIG_PM
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	.suspend =	acm_suspend,
	.resume =	acm_resume,
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	.reset_resume =	acm_reset_resume,
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#endif
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	.id_table =	acm_ids,
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#ifdef CONFIG_PM
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	.supports_autosuspend = 1,
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#endif
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};

/*
 * TTY driver structures.
 */

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static const struct tty_operations acm_ops = {
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	.open =			acm_tty_open,
	.close =		acm_tty_close,
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	.hangup =		acm_tty_hangup,
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	.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,
};

/*
 * Init / exit.
 */

static int __init acm_init(void)
{
	int retval;
	acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
	if (!acm_tty_driver)
		return -ENOMEM;
	acm_tty_driver->owner = THIS_MODULE,
	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,
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	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
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	acm_tty_driver->init_termios = tty_std_termios;
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	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
								HUPCL | CLOCAL;
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	tty_set_operations(acm_tty_driver, &acm_ops);

	retval = tty_register_driver(acm_tty_driver);
	if (retval) {
		put_tty_driver(acm_tty_driver);
		return retval;
	}

	retval = usb_register(&acm_driver);
	if (retval) {
		tty_unregister_driver(acm_tty_driver);
		put_tty_driver(acm_tty_driver);
		return retval;
	}

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	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
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	return 0;
}

static void __exit acm_exit(void)
{
	usb_deregister(&acm_driver);
	tty_unregister_driver(acm_tty_driver);
	put_tty_driver(acm_tty_driver);
}

module_init(acm_init);
module_exit(acm_exit);

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MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);