cdc-acm.c 46.3 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))
L
Linus Torvalds 已提交
571
		goto full_bailout;
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
593 594 595 596 597
	return rv;

full_bailout:
	usb_kill_urb(acm->ctrlurb);
bail_out:
A
Alan Cox 已提交
598
	acm->port.count--;
O
Oliver Neukum 已提交
599
	mutex_unlock(&acm->mutex);
600
	usb_autopm_put_interface(acm->control);
601 602
early_bail:
	mutex_unlock(&open_mutex);
A
Alan Cox 已提交
603
	tty_port_tty_set(&acm->port, NULL);
L
Linus Torvalds 已提交
604 605 606
	return -EIO;
}

607 608
static void acm_tty_unregister(struct acm *acm)
{
A
Alan Cox 已提交
609
	int i, nr;
610

611
	nr = acm->rx_buflimit;
612 613 614 615
	tty_unregister_device(acm_tty_driver, acm->minor);
	usb_put_intf(acm->control);
	acm_table[acm->minor] = NULL;
	usb_free_urb(acm->ctrlurb);
616 617
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
618
	for (i = 0; i < nr; i++)
619
		usb_free_urb(acm->ru[i].urb);
620
	kfree(acm->country_codes);
621 622 623
	kfree(acm);
}

A
Arnd Bergmann 已提交
624
static void acm_port_down(struct acm *acm)
A
Alan Cox 已提交
625 626 627 628 629 630 631 632 633
{
	int i, nr = acm->rx_buflimit;
	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);
634
		tasklet_disable(&acm->urb_task);
A
Alan Cox 已提交
635 636
		for (i = 0; i < nr; i++)
			usb_kill_urb(acm->ru[i].urb);
637
		tasklet_enable(&acm->urb_task);
A
Alan Cox 已提交
638 639 640 641 642 643 644 645 646 647
		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
648
	acm_port_down(acm);
A
Alan Cox 已提交
649 650
}

L
Linus Torvalds 已提交
651 652 653 654
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;

A
Alan Cox 已提交
655 656
	/* Perform the closing process and see if we need to do the hardware
	   shutdown */
657
	if (!acm)
L
Linus Torvalds 已提交
658
		return;
659 660 661 662 663 664 665 666 667 668
	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
669
	acm_port_down(acm);
A
Alan Cox 已提交
670 671
	tty_port_close_end(&acm->port, tty);
	tty_port_tty_set(&acm->port, NULL);
L
Linus Torvalds 已提交
672 673
}

674 675
static int acm_tty_write(struct tty_struct *tty,
					const unsigned char *buf, int count)
L
Linus Torvalds 已提交
676 677 678
{
	struct acm *acm = tty->driver_data;
	int stat;
679 680 681 682
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;

L
Linus Torvalds 已提交
683 684 685 686 687
	if (!ACM_READY(acm))
		return -EINVAL;
	if (!count)
		return 0;

688
	dev_vdbg(&acm->data->dev, "%s - count %d\n", __func__, count);
689

690
	spin_lock_irqsave(&acm->write_lock, flags);
691 692
	wbn = acm_wb_alloc(acm);
	if (wbn < 0) {
693 694 695 696
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];
L
Linus Torvalds 已提交
697

698
	count = (count > acm->writesize) ? acm->writesize : count;
699
	dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
700 701 702
	memcpy(wb->buf, buf, count);
	wb->len = count;
	spin_unlock_irqrestore(&acm->write_lock, flags);
L
Linus Torvalds 已提交
703

704 705
	stat = acm_write_start(acm, wbn);
	if (stat < 0)
L
Linus Torvalds 已提交
706 707 708 709 710 711 712 713 714
		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;
715 716 717 718
	/*
	 * Do not let the line discipline to know that we have a reserve,
	 * or it might get too enthusiastic.
	 */
719
	return acm_wb_is_avail(acm) ? acm->writesize : 0;
L
Linus Torvalds 已提交
720 721 722 723 724 725
}

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
726
		return 0;
727 728 729
	/*
	 * This is inaccurate (overcounts), but it works.
	 */
730
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
L
Linus Torvalds 已提交
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
}

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);
751
	tasklet_schedule(&acm->urb_task);
L
Linus Torvalds 已提交
752 753
}

A
Alan Cox 已提交
754
static int acm_tty_break_ctl(struct tty_struct *tty, int state)
L
Linus Torvalds 已提交
755 756
{
	struct acm *acm = tty->driver_data;
A
Alan Cox 已提交
757
	int retval;
L
Linus Torvalds 已提交
758
	if (!ACM_READY(acm))
A
Alan Cox 已提交
759 760 761
		return -EINVAL;
	retval = acm_send_break(acm, state ? 0xffff : 0);
	if (retval < 0)
762 763
		dev_dbg(&acm->control->dev, "%s - send break failed\n",
								__func__);
A
Alan Cox 已提交
764
	return retval;
L
Linus Torvalds 已提交
765 766
}

767
static int acm_tty_tiocmget(struct tty_struct *tty)
L
Linus Torvalds 已提交
768 769 770 771 772 773 774 775 776 777 778 779 780 781
{
	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;
}

782
static int acm_tty_tiocmset(struct tty_struct *tty,
L
Linus Torvalds 已提交
783 784 785 786 787 788 789 790 791
			    unsigned int set, unsigned int clear)
{
	struct acm *acm = tty->driver_data;
	unsigned int newctrl;

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

	newctrl = acm->ctrlout;
792 793 794 795
	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
796 797 798 799 800 801 802 803

	newctrl = (newctrl & ~clear) | set;

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

804
static int acm_tty_ioctl(struct tty_struct *tty,
805
					unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
806 807 808 809 810 811 812 813 814
{
	struct acm *acm = tty->driver_data;

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

	return -ENOIOCTLCMD;
}

815
static const __u32 acm_tty_speed[] = {
L
Linus Torvalds 已提交
816 817 818 819 820 821 822
	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
};

823
static const __u8 acm_tty_size[] = {
L
Linus Torvalds 已提交
824 825 826
	5, 6, 7, 8
};

827 828
static void acm_tty_set_termios(struct tty_struct *tty,
						struct ktermios *termios_old)
L
Linus Torvalds 已提交
829 830
{
	struct acm *acm = tty->driver_data;
A
Alan Cox 已提交
831
	struct ktermios *termios = tty->termios;
L
Linus Torvalds 已提交
832 833 834 835 836 837
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	if (!ACM_READY(acm))
		return;

838
	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
L
Linus Torvalds 已提交
839 840
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
841 842
				(termios->c_cflag & PARODD ? 1 : 2) +
				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
L
Linus Torvalds 已提交
843
	newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
844
	/* FIXME: Needs to clear unsupported bits in the termios */
L
Linus Torvalds 已提交
845 846 847 848 849
	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (!newline.dwDTERate) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
850 851
	} else
		newctrl |=  ACM_CTRL_DTR;
L
Linus Torvalds 已提交
852 853 854 855 856 857

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

	if (memcmp(&acm->line, &newline, sizeof newline)) {
		memcpy(&acm->line, &newline, sizeof newline);
858 859 860
		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
861 862 863 864 865 866 867 868 869 870
			newline.bCharFormat, newline.bParityType,
			newline.bDataBits);
		acm_set_line(acm, &acm->line);
	}
}

/*
 * USB probe and disconnect routines.
 */

871
/* Little helpers: write/read buffers free */
872 873 874 875
static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;
O
Oliver Neukum 已提交
876
	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
877

878
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
879
		usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
880 881
}

882 883 884 885 886 887
static void acm_read_buffers_free(struct acm *acm)
{
	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
	int i, n = acm->rx_buflimit;

	for (i = 0; i < n; i++)
888 889
		usb_free_coherent(usb_dev, acm->readsize,
				  acm->rb[i].base, acm->rb[i].dma);
890 891
}

892 893 894 895 896 897
/* Little helper: write buffers allocate */
static int acm_write_buffers_alloc(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

898
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
899
		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
900 901 902 903 904
		    &wb->dmah);
		if (!wb->buf) {
			while (i != 0) {
				--i;
				--wb;
905
				usb_free_coherent(acm->dev, acm->writesize,
906 907 908 909 910 911 912 913
				    wb->buf, wb->dmah);
			}
			return -ENOMEM;
		}
	}
	return 0;
}

A
Alan Cox 已提交
914 915
static int acm_probe(struct usb_interface *intf,
		     const struct usb_device_id *id)
L
Linus Torvalds 已提交
916 917
{
	struct usb_cdc_union_desc *union_header = NULL;
918
	struct usb_cdc_country_functional_desc *cfd = NULL;
D
David Brownell 已提交
919
	unsigned char *buffer = intf->altsetting->extra;
L
Linus Torvalds 已提交
920 921 922
	int buflen = intf->altsetting->extralen;
	struct usb_interface *control_interface;
	struct usb_interface *data_interface;
923 924 925
	struct usb_endpoint_descriptor *epctrl = NULL;
	struct usb_endpoint_descriptor *epread = NULL;
	struct usb_endpoint_descriptor *epwrite = NULL;
L
Linus Torvalds 已提交
926 927 928
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct acm *acm;
	int minor;
929
	int ctrlsize, readsize;
L
Linus Torvalds 已提交
930 931 932 933 934 935
	u8 *buf;
	u8 ac_management_function = 0;
	u8 call_management_function = 0;
	int call_interface_num = -1;
	int data_interface_num;
	unsigned long quirks;
936
	int num_rx_buf;
937
	int i;
938
	int combined_interfaces = 0;
L
Linus Torvalds 已提交
939

940
	/* normal quirks */
L
Linus Torvalds 已提交
941
	quirks = (unsigned long)id->driver_info;
942 943 944
	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
L
Linus Torvalds 已提交
945 946 947 948 949
	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;
	}
950

L
Linus Torvalds 已提交
951 952
	/* normal probing*/
	if (!buffer) {
953
		dev_err(&intf->dev, "Weird descriptor references\n");
L
Linus Torvalds 已提交
954 955 956 957
		return -EINVAL;
	}

	if (!buflen) {
958 959
		if (intf->cur_altsetting->endpoint &&
				intf->cur_altsetting->endpoint->extralen &&
960 961 962
				intf->cur_altsetting->endpoint->extra) {
			dev_dbg(&intf->dev,
				"Seeking extra descriptors on endpoint\n");
L
Linus Torvalds 已提交
963 964 965
			buflen = intf->cur_altsetting->endpoint->extralen;
			buffer = intf->cur_altsetting->endpoint->extra;
		} else {
966 967
			dev_err(&intf->dev,
				"Zero length descriptor references\n");
L
Linus Torvalds 已提交
968 969 970 971 972
			return -EINVAL;
		}
	}

	while (buflen > 0) {
973
		if (buffer[1] != USB_DT_CS_INTERFACE) {
974
			dev_err(&intf->dev, "skipping garbage\n");
L
Linus Torvalds 已提交
975 976 977
			goto next_desc;
		}

978 979 980 981 982 983
		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
984
			}
985 986 987 988 989 990 991 992 993 994 995 996 997
			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];
998
			if ( (quirks & NOT_A_MODEM) == 0 && (call_management_function & 3) != 3)
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
				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
1010 1011 1012 1013 1014 1015 1016
next_desc:
		buflen -= buffer[0];
		buffer += buffer[0];
	}

	if (!union_header) {
		if (call_interface_num > 0) {
1017
			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
L
Linus Torvalds 已提交
1018 1019 1020
			data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
			control_interface = intf;
		} else {
1021 1022 1023 1024 1025 1026 1027 1028 1029
			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
1030 1031 1032 1033 1034
		}
	} 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) {
1035
			dev_dbg(&intf->dev, "no interfaces\n");
L
Linus Torvalds 已提交
1036 1037 1038
			return -ENODEV;
		}
	}
1039

L
Linus Torvalds 已提交
1040
	if (data_interface_num != call_interface_num)
1041
		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
L
Linus Torvalds 已提交
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 1071 1072
	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
1073 1074 1075
skip_normal_probe:

	/*workaround for switched interfaces */
1076 1077 1078 1079
	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
1080
			struct usb_interface *t;
1081 1082
			dev_dbg(&intf->dev,
				"Your device has switched interfaces.\n");
L
Linus Torvalds 已提交
1083 1084 1085 1086 1087 1088 1089
			t = control_interface;
			control_interface = data_interface;
			data_interface = t;
		} else {
			return -EINVAL;
		}
	}
1090 1091

	/* Accept probe requests only for the control interface */
1092
	if (!combined_interfaces && intf != control_interface)
1093
		return -ENODEV;
1094

1095 1096
	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
		/* valid in this context */
1097
		dev_dbg(&intf->dev, "The data interface isn't available\n");
L
Linus Torvalds 已提交
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
		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 */
1111
	if (!usb_endpoint_dir_in(epread)) {
L
Linus Torvalds 已提交
1112 1113
		/* descriptors are swapped */
		struct usb_endpoint_descriptor *t;
1114 1115
		dev_dbg(&intf->dev,
			"The data interface has switched endpoints\n");
L
Linus Torvalds 已提交
1116 1117 1118 1119
		t = epread;
		epread = epwrite;
		epwrite = t;
	}
1120
made_compressed_probe:
1121
	dev_dbg(&intf->dev, "interfaces are valid\n");
L
Linus Torvalds 已提交
1122 1123 1124
	for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);

	if (minor == ACM_TTY_MINORS) {
1125
		dev_err(&intf->dev, "no more free acm devices\n");
L
Linus Torvalds 已提交
1126 1127 1128
		return -ENODEV;
	}

1129 1130
	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
	if (acm == NULL) {
1131
		dev_err(&intf->dev, "out of memory (acm kzalloc)\n");
L
Linus Torvalds 已提交
1132 1133 1134 1135
		goto alloc_fail;
	}

	ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
1136 1137
	readsize = le16_to_cpu(epread->wMaxPacketSize) *
				(quirks == SINGLE_RX_URB ? 1 : 2);
1138
	acm->combined_interfaces = combined_interfaces;
1139
	acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144
	acm->control = control_interface;
	acm->data = data_interface;
	acm->minor = minor;
	acm->dev = usb_dev;
	acm->ctrl_caps = ac_management_function;
1145 1146
	if (quirks & NO_CAP_LINE)
		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
L
Linus Torvalds 已提交
1147 1148
	acm->ctrlsize = ctrlsize;
	acm->readsize = readsize;
1149
	acm->rx_buflimit = num_rx_buf;
1150 1151
	acm->urb_task.func = acm_rx_tasklet;
	acm->urb_task.data = (unsigned long) acm;
D
David Howells 已提交
1152
	INIT_WORK(&acm->work, acm_softint);
L
Linus Torvalds 已提交
1153
	spin_lock_init(&acm->throttle_lock);
1154
	spin_lock_init(&acm->write_lock);
1155
	spin_lock_init(&acm->read_lock);
O
Oliver Neukum 已提交
1156
	mutex_init(&acm->mutex);
1157
	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1158 1159 1160
	acm->is_int_ep = usb_endpoint_xfer_int(epread);
	if (acm->is_int_ep)
		acm->bInterval = epread->bInterval;
A
Alan Cox 已提交
1161 1162
	tty_port_init(&acm->port);
	acm->port.ops = &acm_port_ops;
L
Linus Torvalds 已提交
1163

1164
	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
L
Linus Torvalds 已提交
1165
	if (!buf) {
1166
		dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
L
Linus Torvalds 已提交
1167 1168 1169 1170
		goto alloc_fail2;
	}
	acm->ctrl_buffer = buf;

1171
	if (acm_write_buffers_alloc(acm) < 0) {
1172
		dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
L
Linus Torvalds 已提交
1173 1174 1175 1176 1177
		goto alloc_fail4;
	}

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb) {
1178
		dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
L
Linus Torvalds 已提交
1179 1180
		goto alloc_fail5;
	}
1181
	for (i = 0; i < num_rx_buf; i++) {
1182 1183
		struct acm_ru *rcv = &(acm->ru[i]);

1184 1185
		rcv->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (rcv->urb == NULL) {
1186
			dev_err(&intf->dev,
1187
				"out of memory (read urbs usb_alloc_urb)\n");
1188
			goto alloc_fail6;
1189 1190 1191 1192 1193
		}

		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		rcv->instance = acm;
	}
1194
	for (i = 0; i < num_rx_buf; i++) {
D
David Brownell 已提交
1195
		struct acm_rb *rb = &(acm->rb[i]);
1196

1197
		rb->base = usb_alloc_coherent(acm->dev, readsize,
D
David Brownell 已提交
1198 1199
				GFP_KERNEL, &rb->dma);
		if (!rb->base) {
1200
			dev_err(&intf->dev,
1201
				"out of memory (read bufs usb_alloc_coherent)\n");
1202 1203
			goto alloc_fail7;
		}
L
Linus Torvalds 已提交
1204
	}
1205
	for (i = 0; i < ACM_NW; i++) {
1206 1207
		struct acm_wb *snd = &(acm->wb[i]);

1208 1209
		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (snd->urb == NULL) {
1210
			dev_err(&intf->dev,
1211
				"out of memory (write urbs usb_alloc_urb)\n");
1212
			goto alloc_fail8;
1213 1214
		}

1215 1216 1217 1218 1219 1220 1221 1222
		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);
1223 1224
		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		snd->instance = acm;
L
Linus Torvalds 已提交
1225 1226
	}

1227
	usb_set_intfdata(intf, acm);
1228 1229 1230 1231 1232 1233 1234 1235 1236 1237

	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;
1238 1239
		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
							cfd->bLength - 4);
1240 1241 1242 1243 1244 1245 1246 1247
		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;
		}

1248 1249
		i = device_create_file(&intf->dev,
						&dev_attr_iCountryCodeRelDate);
1250
		if (i < 0) {
1251
			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
1252 1253 1254 1255 1256 1257
			kfree(acm->country_codes);
			goto skip_countries;
		}
	}

skip_countries:
1258
	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1259 1260 1261 1262
			 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
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
	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
1275
	usb_set_intfdata(data_interface, acm);
L
Linus Torvalds 已提交
1276

1277 1278
	usb_get_intf(control_interface);
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);
L
Linus Torvalds 已提交
1279 1280 1281

	acm_table[minor] = acm;

1282 1283
	return 0;
alloc_fail8:
1284 1285
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
L
Linus Torvalds 已提交
1286
alloc_fail7:
1287
	acm_read_buffers_free(acm);
1288
alloc_fail6:
1289
	for (i = 0; i < num_rx_buf; i++)
1290
		usb_free_urb(acm->ru[i].urb);
L
Linus Torvalds 已提交
1291 1292
	usb_free_urb(acm->ctrlurb);
alloc_fail5:
1293
	acm_write_buffers_free(acm);
L
Linus Torvalds 已提交
1294
alloc_fail4:
1295
	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
L
Linus Torvalds 已提交
1296 1297 1298 1299 1300 1301
alloc_fail2:
	kfree(acm);
alloc_fail:
	return -ENOMEM;
}

O
Oliver Neukum 已提交
1302 1303 1304
static void stop_data_traffic(struct acm *acm)
{
	int i;
1305 1306

	dev_dbg(&acm->control->dev, "%s\n", __func__);
O
Oliver Neukum 已提交
1307 1308 1309 1310

	tasklet_disable(&acm->urb_task);

	usb_kill_urb(acm->ctrlurb);
1311
	for (i = 0; i < ACM_NW; i++)
1312
		usb_kill_urb(acm->wb[i].urb);
O
Oliver Neukum 已提交
1313 1314 1315 1316 1317 1318 1319 1320
	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
1321 1322
static void acm_disconnect(struct usb_interface *intf)
{
1323
	struct acm *acm = usb_get_intfdata(intf);
L
Linus Torvalds 已提交
1324
	struct usb_device *usb_dev = interface_to_usbdev(intf);
A
Alan Cox 已提交
1325
	struct tty_struct *tty;
L
Linus Torvalds 已提交
1326

D
David Brownell 已提交
1327 1328
	/* sibling interface is already cleaning up */
	if (!acm)
1329
		return;
D
David Brownell 已提交
1330 1331

	mutex_lock(&open_mutex);
1332
	if (acm->country_codes) {
1333 1334 1335 1336
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
1337
	}
1338
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
L
Linus Torvalds 已提交
1339
	acm->dev = NULL;
1340 1341
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
L
Linus Torvalds 已提交
1342

O
Oliver Neukum 已提交
1343
	stop_data_traffic(acm);
L
Linus Torvalds 已提交
1344

1345
	acm_write_buffers_free(acm);
1346 1347
	usb_free_coherent(usb_dev, acm->ctrlsize, acm->ctrl_buffer,
			  acm->ctrl_dma);
1348
	acm_read_buffers_free(acm);
L
Linus Torvalds 已提交
1349

1350 1351
	if (!acm->combined_interfaces)
		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1352
					acm->data : acm->control);
L
Linus Torvalds 已提交
1353

A
Alan Cox 已提交
1354
	if (acm->port.count == 0) {
1355
		acm_tty_unregister(acm);
1356
		mutex_unlock(&open_mutex);
L
Linus Torvalds 已提交
1357 1358 1359
		return;
	}

1360
	mutex_unlock(&open_mutex);
A
Alan Cox 已提交
1361 1362 1363 1364 1365
	tty = tty_port_tty_get(&acm->port);
	if (tty) {
		tty_hangup(tty);
		tty_kref_put(tty);
	}
L
Linus Torvalds 已提交
1366 1367
}

1368
#ifdef CONFIG_PM
O
Oliver Neukum 已提交
1369 1370 1371
static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct acm *acm = usb_get_intfdata(intf);
1372 1373
	int cnt;

A
Alan Stern 已提交
1374
	if (message.event & PM_EVENT_AUTO) {
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
		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
1391

1392
	if (cnt)
O
Oliver Neukum 已提交
1393 1394 1395 1396 1397 1398 1399
		return 0;
	/*
	we treat opened interfaces differently,
	we must guard against open
	*/
	mutex_lock(&acm->mutex);

A
Alan Cox 已提交
1400
	if (acm->port.count)
O
Oliver Neukum 已提交
1401 1402 1403 1404 1405 1406 1407 1408 1409
		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);
1410
	struct acm_wb *wb;
O
Oliver Neukum 已提交
1411
	int rv = 0;
1412
	int cnt;
O
Oliver Neukum 已提交
1413

1414 1415 1416 1417 1418 1419
	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
1420 1421 1422
		return 0;

	mutex_lock(&acm->mutex);
A
Alan Cox 已提交
1423
	if (acm->port.count) {
O
Oliver Neukum 已提交
1424
		rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1425 1426 1427 1428 1429 1430

		spin_lock_irq(&acm->write_lock);
		if (acm->delayed_wb) {
			wb = acm->delayed_wb;
			acm->delayed_wb = NULL;
			spin_unlock_irq(&acm->write_lock);
1431
			acm_start_wb(acm, wb);
1432 1433 1434 1435 1436 1437 1438 1439
		} 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
1440
		if (rv < 0)
1441
			goto err_out;
O
Oliver Neukum 已提交
1442 1443 1444 1445 1446 1447 1448 1449

		tasklet_schedule(&acm->urb_task);
	}

err_out:
	mutex_unlock(&acm->mutex);
	return rv;
}
1450

1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
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);
}

1468
#endif /* CONFIG_PM */
1469 1470 1471 1472 1473 1474

#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)

1475 1476 1477 1478 1479
#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
1480 1481 1482 1483
/*
 * USB driver structure.
 */

1484
static const struct usb_device_id acm_ids[] = {
L
Linus Torvalds 已提交
1485 1486 1487 1488
	/* quirky and broken devices */
	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1489 1490 1491
	{ 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
1492 1493 1494
	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1495 1496 1497
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1498 1499 1500
	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
A
Alan Cox 已提交
1501 1502 1503
	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB,
	},
1504 1505 1506
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
1507 1508 1509
	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
O
Oliver Neukum 已提交
1510 1511 1512
	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1513 1514 1515
	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1516 1517 1518
	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1519 1520 1521
	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1522 1523 1524
	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1525 1526
	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
	},
1527 1528 1529 1530 1531 1532 1533
	{ 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. */
	},
1534 1535 1536
	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},
1537 1538 1539
	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},
O
Oliver Neukum 已提交
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	/* 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 */
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	{ 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);