cdc-acm.c 38.5 KB
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/*
 * cdc-acm.c
 *
 * Copyright (c) 1999 Armin Fuerst	<fuerst@in.tum.de>
 * Copyright (c) 1999 Pavel Machek	<pavel@suse.cz>
 * Copyright (c) 1999 Johannes Erdfelt	<johannes@erdfelt.com>
 * Copyright (c) 2000 Vojtech Pavlik	<vojtech@suse.cz>
 * Copyright (c) 2004 Oliver Neukum	<oliver@neukum.name>
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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
 *
 * ChangeLog:
 *	v0.9  - thorough cleaning, URBification, almost a rewrite
 *	v0.10 - some more cleanups
 *	v0.11 - fixed flow control, read error doesn't stop reads
 *	v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced
 *	v0.13 - added termios, added hangup
 *	v0.14 - sized down struct acm
 *	v0.15 - fixed flow control again - characters could be lost
 *	v0.16 - added code for modems with swapped data and control interfaces
 *	v0.17 - added new style probing
 *	v0.18 - fixed new style probing for devices with more configurations
 *	v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan)
 *	v0.20 - switched to probing on interface (rather than device) class
 *	v0.21 - revert to probing on device for devices with multiple configs
 *	v0.22 - probe only the control interface. if usbcore doesn't choose the
 *		config we want, sysadmin changes bConfigurationValue in sysfs.
 *	v0.23 - use softirq for rx processing, as needed by tty layer
 *	v0.24 - change probe method to evaluate CDC union descriptor
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 *	v0.25 - downstream tasks paralelized to maximize throughput
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 *	v0.26 - multiple write urbs, writesize increased
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 */

/*
 * 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>
#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 <asm/uaccess.h>
#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 ACM_CLOSE_TIMEOUT	15	/* seconds to let writes drain */

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/*
 * Version Information
 */
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#define DRIVER_VERSION "v0.26"
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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->used)

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#ifdef VERBOSE_DEBUG
#define verbose	1
#else
#define verbose	0
#endif

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/*
 * Functions for ACM control messages.
 */

static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len)
{
	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);
	dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval);
	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++) {
		n -= acm->wb[i].use;
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	}
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	spin_unlock_irqrestore(&acm->write_lock, flags);
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	return n;
}

/*
 * Finish write.
 */
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static void acm_write_done(struct acm *acm, struct acm_wb *wb)
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{
	unsigned long flags;

	spin_lock_irqsave(&acm->write_lock, flags);
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	wb->use = 0;
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	acm->transmitting--;
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	spin_unlock_irqrestore(&acm->write_lock, flags);
}

/*
 * 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;

	if ((rc = usb_submit_urb(wb->urb, GFP_ATOMIC)) < 0) {
		dbg("usb_submit_urb(write bulk) failed: %d", rc);
		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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	dbg("%s susp_count: %d", __func__, acm->susp_count);
	if (acm->susp_count) {
		acm->delayed_wb = wb;
		schedule_work(&acm->waker);
		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;
	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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		dbg("%s - urb shutting down with status: %d", __func__, status);
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		return;
	default:
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		dbg("%s - nonzero urb status received: %d", __func__, status);
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		goto exit;
	}

	if (!ACM_READY(acm))
		goto exit;

	data = (unsigned char *)(dr + 1);
	switch (dr->bNotificationType) {

		case USB_CDC_NOTIFY_NETWORK_CONNECTION:

			dbg("%s network", dr->wValue ? "connected to" : "disconnected from");
			break;

		case USB_CDC_NOTIFY_SERIAL_STATE:

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			newctrl = get_unaligned_le16(data);
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			if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
				dbg("calling hangup");
				tty_hangup(acm->tty);
			}

			acm->ctrlin = newctrl;

			dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
				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 ? '+' : '-');

			break;

		default:
			dbg("unknown notification %d received: index %d len %d data0 %d data1 %d",
				dr->bNotificationType, dr->wIndex,
				dr->wLength, data[0], data[1]);
			break;
	}
exit:
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	usb_mark_last_busy(acm->dev);
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	retval = usb_submit_urb (urb, GFP_ATOMIC);
	if (retval)
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		dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with "
			"result %d", __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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	dbg("Entering acm_read_bulk with status %d", status);
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	if (!ACM_READY(acm)) {
		dev_dbg(&acm->data->dev, "Aborting, acm not ready");
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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, "bulk rx status %d\n", 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 = acm->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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	dbg("Entering acm_rx_tasklet");

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	if (!ACM_READY(acm))
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	{
		dbg("acm_rx_tasklet: ACM not ready");
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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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	{
		dbg("acm_rx_tasklet: throttled");
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		return;
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	}
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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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	dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
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	tty_buffer_request_room(tty, buf->size);
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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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		tty_insert_flip_string(tty, buf->base, buf->size);
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	tty_flip_buffer_push(tty);
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	if (throttled) {
		dbg("Throttling noticed");
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		spin_lock_irqsave(&acm->read_lock, flags);
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		list_add(&buf->list, &acm->filled_read_bufs);
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		spin_unlock_irqrestore(&acm->read_lock, flags);
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		return;
	}

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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;

urbs:
	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;

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

		/* 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);
		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);
			dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", 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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	if (verbose || urb->status
			|| (urb->actual_length != urb->transfer_buffer_length))
		dev_dbg(&acm->data->dev, "tx %d/%d bytes -- > %d\n",
			urb->actual_length,
			urb->transfer_buffer_length,
			urb->status);
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	acm_write_done(acm, wb);
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	if (ACM_READY(acm))
		schedule_work(&acm->work);
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	else
		wake_up_interruptible(&acm->drain_wait);
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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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	dev_vdbg(&acm->data->dev, "tx work\n");
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	if (!ACM_READY(acm))
		return;
	tty_wakeup(acm->tty);
}

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static void acm_waker(struct work_struct *waker)
{
	struct acm *acm = container_of(waker, struct acm, waker);
	int rv;

	rv = usb_autopm_get_interface(acm->control);
	if (rv < 0) {
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		dev_err(&acm->dev->dev, "Autopm failure in %s\n", __func__);
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		return;
	}
	if (acm->delayed_wb) {
		acm_start_wb(acm, acm->delayed_wb);
		acm->delayed_wb = NULL;
	}
	usb_autopm_put_interface(acm->control);
}

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/*
 * TTY handlers
 */

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

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	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
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	tty->driver_data = acm;
	acm->tty = tty;

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	/* force low_latency on so that our tty_push actually forces the data through,
	   otherwise it is scheduled, and with high data rates data can get lost. */
	tty->low_latency = 1;
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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);
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	if (acm->used++) {
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		usb_autopm_put_interface(acm->control);
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		goto done;
        }

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	acm->ctrlurb->dev = acm->dev;
	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
		dbg("usb_submit_urb(ctrl irq) failed");
		goto bail_out;
	}

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	if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
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		goto full_bailout;
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	usb_autopm_put_interface(acm->control);
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	INIT_LIST_HEAD(&acm->spare_read_urbs);
	INIT_LIST_HEAD(&acm->spare_read_bufs);
	INIT_LIST_HEAD(&acm->filled_read_bufs);
580
	for (i = 0; i < acm->rx_buflimit; i++) {
581 582
		list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
	}
583
	for (i = 0; i < acm->rx_buflimit; i++) {
584 585 586
		list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
	}

587 588
	acm->throttle = 0;

589
	tasklet_schedule(&acm->urb_task);
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done:
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	mutex_unlock(&acm->mutex);
593
err_out:
594
	mutex_unlock(&open_mutex);
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	return rv;

full_bailout:
	usb_kill_urb(acm->ctrlurb);
bail_out:
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	usb_autopm_put_interface(acm->control);
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	acm->used--;
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	mutex_unlock(&acm->mutex);
603 604
early_bail:
	mutex_unlock(&open_mutex);
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	return -EIO;
}

608 609
static void acm_tty_unregister(struct acm *acm)
{
610
	int i,nr;
611

612
	nr = acm->rx_buflimit;
613 614 615 616
	tty_unregister_device(acm_tty_driver, acm->minor);
	usb_put_intf(acm->control);
	acm_table[acm->minor] = NULL;
	usb_free_urb(acm->ctrlurb);
617 618
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
619
	for (i = 0; i < nr; i++)
620
		usb_free_urb(acm->ru[i].urb);
621
	kfree(acm->country_codes);
622 623 624
	kfree(acm);
}

625 626
static int acm_tty_chars_in_buffer(struct tty_struct *tty);

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static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;
630
	int i,nr;
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	if (!acm || !acm->used)
		return;

635
	nr = acm->rx_buflimit;
636
	mutex_lock(&open_mutex);
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	if (!--acm->used) {
		if (acm->dev) {
639
			usb_autopm_get_interface(acm->control);
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			acm_set_control(acm, acm->ctrlout = 0);
641 642 643 644 645 646 647

			/* try letting the last writes drain naturally */
			wait_event_interruptible_timeout(acm->drain_wait,
					(ACM_NW == acm_wb_is_avail(acm))
						|| !acm->dev,
					ACM_CLOSE_TIMEOUT * HZ);

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			usb_kill_urb(acm->ctrlurb);
649 650
			for (i = 0; i < ACM_NW; i++)
				usb_kill_urb(acm->wb[i].urb);
651
			for (i = 0; i < nr; i++)
652
				usb_kill_urb(acm->ru[i].urb);
653
			acm->control->needs_remote_wakeup = 0;
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			usb_autopm_put_interface(acm->control);
655 656
		} else
			acm_tty_unregister(acm);
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	}
658
	mutex_unlock(&open_mutex);
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}

static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	struct acm *acm = tty->driver_data;
	int stat;
665 666 667 668
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;

669
	dbg("Entering acm_tty_write to write %d bytes,", count);
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	if (!ACM_READY(acm))
		return -EINVAL;
	if (!count)
		return 0;

676 677 678 679 680 681
	spin_lock_irqsave(&acm->write_lock, flags);
	if ((wbn = acm_wb_alloc(acm)) < 0) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];
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683
	count = (count > acm->writesize) ? acm->writesize : count;
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	dbg("Get %d bytes...", count);
685 686 687
	memcpy(wb->buf, buf, count);
	wb->len = count;
	spin_unlock_irqrestore(&acm->write_lock, flags);
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689
	if ((stat = acm_write_start(acm, wbn)) < 0)
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		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;
699 700 701 702
	/*
	 * Do not let the line discipline to know that we have a reserve,
	 * or it might get too enthusiastic.
	 */
703
	return acm_wb_is_avail(acm) ? acm->writesize : 0;
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}

static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
		return -EINVAL;
711 712 713
	/*
	 * This is inaccurate (overcounts), but it works.
	 */
714
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
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}

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);
735
	tasklet_schedule(&acm->urb_task);
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}

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static int acm_tty_break_ctl(struct tty_struct *tty, int state)
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{
	struct acm *acm = tty->driver_data;
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741
	int retval;
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742
	if (!ACM_READY(acm))
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		return -EINVAL;
	retval = acm_send_break(acm, state ? 0xffff : 0);
	if (retval < 0)
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		dbg("send break failed");
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747
	return retval;
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}

static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)
{
	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;
}

static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file,
			    unsigned int set, unsigned int clear)
{
	struct acm *acm = tty->driver_data;
	unsigned int newctrl;

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

	newctrl = acm->ctrlout;
	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);

	newctrl = (newctrl & ~clear) | set;

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

static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct acm *acm = tty->driver_data;

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

	return -ENOIOCTLCMD;
}

795
static const __u32 acm_tty_speed[] = {
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	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
};

803
static const __u8 acm_tty_size[] = {
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	5, 6, 7, 8
};

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807
static void acm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios_old)
L
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{
	struct acm *acm = tty->driver_data;
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Alan Cox 已提交
810
	struct ktermios *termios = tty->termios;
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811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	if (!ACM_READY(acm))
		return;

	newline.dwDTERate = cpu_to_le32p(acm_tty_speed +
		(termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0));
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
		(termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
	newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];

	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (!newline.dwDTERate) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
	} else  newctrl |=  ACM_CTRL_DTR;

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

	if (memcmp(&acm->line, &newline, sizeof newline)) {
		memcpy(&acm->line, &newline, sizeof newline);
		dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate),
			newline.bCharFormat, newline.bParityType,
			newline.bDataBits);
		acm_set_line(acm, &acm->line);
	}
}

/*
 * USB probe and disconnect routines.
 */

847
/* Little helpers: write/read buffers free */
848 849 850 851
static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;
O
Oliver Neukum 已提交
852
	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
853

854
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
O
Oliver Neukum 已提交
855
		usb_buffer_free(usb_dev, acm->writesize, wb->buf, wb->dmah);
856 857 858
	}
}

859 860 861 862 863 864 865 866 867
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++)
		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
}

868 869 870 871 872 873
/* Little helper: write buffers allocate */
static int acm_write_buffers_alloc(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

874
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
		wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL,
		    &wb->dmah);
		if (!wb->buf) {
			while (i != 0) {
				--i;
				--wb;
				usb_buffer_free(acm->dev, acm->writesize,
				    wb->buf, wb->dmah);
			}
			return -ENOMEM;
		}
	}
	return 0;
}

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static int acm_probe (struct usb_interface *intf,
		      const struct usb_device_id *id)
{
	struct usb_cdc_union_desc *union_header = NULL;
894
	struct usb_cdc_country_functional_desc *cfd = NULL;
D
David Brownell 已提交
895
	unsigned char *buffer = intf->altsetting->extra;
L
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896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911
	int buflen = intf->altsetting->extralen;
	struct usb_interface *control_interface;
	struct usb_interface *data_interface;
	struct usb_endpoint_descriptor *epctrl;
	struct usb_endpoint_descriptor *epread;
	struct usb_endpoint_descriptor *epwrite;
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct acm *acm;
	int minor;
	int ctrlsize,readsize;
	u8 *buf;
	u8 ac_management_function = 0;
	u8 call_management_function = 0;
	int call_interface_num = -1;
	int data_interface_num;
	unsigned long quirks;
912
	int num_rx_buf;
913
	int i;
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914

915
	/* normal quirks */
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	quirks = (unsigned long)id->driver_info;
917 918 919
	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
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	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;
	}
	
	/* normal probing*/
	if (!buffer) {
928
		dev_err(&intf->dev, "Weird descriptor references\n");
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		return -EINVAL;
	}

	if (!buflen) {
		if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) {
934
			dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint\n");
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935 936 937
			buflen = intf->cur_altsetting->endpoint->extralen;
			buffer = intf->cur_altsetting->endpoint->extra;
		} else {
938 939
			dev_err(&intf->dev,
				"Zero length descriptor references\n");
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940 941 942 943 944 945
			return -EINVAL;
		}
	}

	while (buflen > 0) {
		if (buffer [1] != USB_DT_CS_INTERFACE) {
946
			dev_err(&intf->dev, "skipping garbage\n");
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947 948 949 950 951 952
			goto next_desc;
		}

		switch (buffer [2]) {
			case USB_CDC_UNION_TYPE: /* we've found it */
				if (union_header) {
953 954 955
					dev_err(&intf->dev, "More than one "
						"union descriptor, "
						"skipping ...\n");
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					goto next_desc;
				}
				union_header = (struct usb_cdc_union_desc *)
							buffer;
				break;
961 962 963
			case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
				cfd = (struct usb_cdc_country_functional_desc *)buffer;
				break;
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964 965 966 967 968 969 970 971 972
			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];
				if ((call_management_function & 3) != 3)
973 974 975
					dev_err(&intf->dev, "This device "
						"cannot do calls on its own. "
						"It is no modem.\n");
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976 977
				break;
			default:
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978 979 980 981 982 983
				/* 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]);
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984 985 986 987 988 989 990 991 992
				break;
			}
next_desc:
		buflen -= buffer[0];
		buffer += buffer[0];
	}

	if (!union_header) {
		if (call_interface_num > 0) {
993
			dev_dbg(&intf->dev,"No union descriptor, using call management descriptor\n");
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			data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
			control_interface = intf;
		} else {
997
			dev_dbg(&intf->dev,"No union descriptor, giving up\n");
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			return -ENODEV;
		}
	} 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) {
1004
			dev_dbg(&intf->dev,"no interfaces\n");
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1005 1006 1007 1008 1009
			return -ENODEV;
		}
	}
	
	if (data_interface_num != call_interface_num)
J
Joe Perches 已提交
1010
		dev_dbg(&intf->dev,"Separate call control interface. That is not fully supported.\n");
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1011 1012 1013 1014 1015 1016 1017

skip_normal_probe:

	/*workaround for switched interfaces */
	if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) {
		if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) {
			struct usb_interface *t;
1018
			dev_dbg(&intf->dev,"Your device has switched interfaces.\n");
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1019 1020 1021 1022 1023 1024 1025 1026

			t = control_interface;
			control_interface = data_interface;
			data_interface = t;
		} else {
			return -EINVAL;
		}
	}
1027 1028 1029 1030

	/* Accept probe requests only for the control interface */
	if (intf != control_interface)
		return -ENODEV;
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	if (usb_interface_claimed(data_interface)) { /* valid in this context */
1033
		dev_dbg(&intf->dev,"The data interface isn't available\n");
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		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 */
1047
	if (!usb_endpoint_dir_in(epread)) {
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		/* descriptors are swapped */
		struct usb_endpoint_descriptor *t;
1050
		dev_dbg(&intf->dev,"The data interface has switched endpoints\n");
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1051 1052 1053 1054 1055 1056 1057 1058 1059
		
		t = epread;
		epread = epwrite;
		epwrite = t;
	}
	dbg("interfaces are valid");
	for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);

	if (minor == ACM_TTY_MINORS) {
1060
		dev_err(&intf->dev, "no more free acm devices\n");
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		return -ENODEV;
	}

1064
	if (!(acm = kzalloc(sizeof(struct acm), GFP_KERNEL))) {
1065
		dev_dbg(&intf->dev, "out of memory (acm kzalloc)\n");
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		goto alloc_fail;
	}

	ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
1070
	readsize = le16_to_cpu(epread->wMaxPacketSize)* ( quirks == SINGLE_RX_URB ? 1 : 2);
1071
	acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
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	acm->control = control_interface;
	acm->data = data_interface;
	acm->minor = minor;
	acm->dev = usb_dev;
	acm->ctrl_caps = ac_management_function;
	acm->ctrlsize = ctrlsize;
	acm->readsize = readsize;
1079
	acm->rx_buflimit = num_rx_buf;
1080 1081
	acm->urb_task.func = acm_rx_tasklet;
	acm->urb_task.data = (unsigned long) acm;
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1082
	INIT_WORK(&acm->work, acm_softint);
1083
	INIT_WORK(&acm->waker, acm_waker);
1084
	init_waitqueue_head(&acm->drain_wait);
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1085
	spin_lock_init(&acm->throttle_lock);
1086
	spin_lock_init(&acm->write_lock);
1087
	spin_lock_init(&acm->read_lock);
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	mutex_init(&acm->mutex);
1089
	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
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	buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
	if (!buf) {
1093
		dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n");
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		goto alloc_fail2;
	}
	acm->ctrl_buffer = buf;

1098
	if (acm_write_buffers_alloc(acm) < 0) {
1099
		dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n");
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		goto alloc_fail4;
	}

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb) {
1105
		dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
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		goto alloc_fail5;
	}
1108
	for (i = 0; i < num_rx_buf; i++) {
1109 1110 1111
		struct acm_ru *rcv = &(acm->ru[i]);

		if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
1112
			dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)\n");
1113 1114 1115 1116 1117 1118
			goto alloc_fail7;
		}

		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		rcv->instance = acm;
	}
1119
	for (i = 0; i < num_rx_buf; i++) {
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		struct acm_rb *rb = &(acm->rb[i]);
1121

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		rb->base = usb_buffer_alloc(acm->dev, readsize,
				GFP_KERNEL, &rb->dma);
		if (!rb->base) {
1125
			dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)\n");
1126 1127
			goto alloc_fail7;
		}
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	}
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
	for(i = 0; i < ACM_NW; i++)
	{
		struct acm_wb *snd = &(acm->wb[i]);

		if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
			dev_dbg(&intf->dev, "out of memory (write urbs usb_alloc_urb)");
			goto alloc_fail7;
		}

		usb_fill_bulk_urb(snd->urb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
				NULL, acm->writesize, acm_write_bulk, snd);
		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		snd->instance = acm;
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	}

1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
	usb_set_intfdata (intf, acm);

	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;
		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, cfd->bLength - 4);
		acm->country_rel_date = cfd->iCountryCodeRelDate;

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

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

skip_countries:
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	usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval);
	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);
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	usb_set_intfdata(data_interface, acm);
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1188 1189
	usb_get_intf(control_interface);
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);
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	acm_table[minor] = acm;

1193 1194
	return 0;
alloc_fail8:
1195 1196
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
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alloc_fail7:
1198
	acm_read_buffers_free(acm);
1199
	for (i = 0; i < num_rx_buf; i++)
1200
		usb_free_urb(acm->ru[i].urb);
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	usb_free_urb(acm->ctrlurb);
alloc_fail5:
1203
	acm_write_buffers_free(acm);
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alloc_fail4:
	usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
alloc_fail2:
	kfree(acm);
alloc_fail:
	return -ENOMEM;
}

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static void stop_data_traffic(struct acm *acm)
{
	int i;
1215
	dbg("Entering stop_data_traffic");
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	tasklet_disable(&acm->urb_task);

	usb_kill_urb(acm->ctrlurb);
1220 1221
	for(i = 0; i < ACM_NW; i++)
		usb_kill_urb(acm->wb[i].urb);
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	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);
1228
	cancel_work_sync(&acm->waker);
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}

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static void acm_disconnect(struct usb_interface *intf)
{
1233
	struct acm *acm = usb_get_intfdata(intf);
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	struct usb_device *usb_dev = interface_to_usbdev(intf);

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	/* sibling interface is already cleaning up */
	if (!acm)
1238
		return;
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	mutex_lock(&open_mutex);
1241
	if (acm->country_codes){
1242 1243 1244 1245
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
1246
	}
1247
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
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	acm->dev = NULL;
1249 1250
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
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	stop_data_traffic(acm);
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1254
	acm_write_buffers_free(acm);
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	usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
1256
	acm_read_buffers_free(acm);
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1258 1259
	usb_driver_release_interface(&acm_driver, intf == acm->control ?
					acm->data : acm->control);
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	if (!acm->used) {
1262
		acm_tty_unregister(acm);
1263
		mutex_unlock(&open_mutex);
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		return;
	}

1267
	mutex_unlock(&open_mutex);
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	if (acm->tty)
		tty_hangup(acm->tty);
}

1273
#ifdef CONFIG_PM
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static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct acm *acm = usb_get_intfdata(intf);
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
	int cnt;

	if (acm->dev->auto_pm) {
		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);
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1297
	if (cnt)
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		return 0;
	/*
	we treat opened interfaces differently,
	we must guard against open
	*/
	mutex_lock(&acm->mutex);

	if (acm->used)
		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);
	int rv = 0;
1316
	int cnt;
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1318 1319 1320 1321 1322 1323
	spin_lock_irq(&acm->read_lock);
	acm->susp_count -= 1;
	cnt = acm->susp_count;
	spin_unlock_irq(&acm->read_lock);

	if (cnt)
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		return 0;

	mutex_lock(&acm->mutex);
	if (acm->used) {
		rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
		if (rv < 0)
1330
			goto err_out;
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		tasklet_schedule(&acm->urb_task);
	}

err_out:
	mutex_unlock(&acm->mutex);
	return rv;
}
1339 1340

#endif /* CONFIG_PM */
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/*
 * USB driver structure.
 */

static struct usb_device_id acm_ids[] = {
	/* quirky and broken devices */
	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1350 1351 1352
	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1353 1354 1355
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1356 1357 1358
	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1359 1360 1361
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
1362 1363 1364
	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
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	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1368 1369 1370
	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1371 1372 1373
	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
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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,
		USB_CDC_ACM_PROTO_AT_3G	) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_CDMA) },

	/* NOTE:  COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */
	{ }
};

MODULE_DEVICE_TABLE (usb, acm_ids);

static struct usb_driver acm_driver = {
	.name =		"cdc_acm",
	.probe =	acm_probe,
	.disconnect =	acm_disconnect,
1399
#ifdef CONFIG_PM
O
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	.suspend =	acm_suspend,
	.resume =	acm_resume,
1402
#endif
L
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1403
	.id_table =	acm_ids,
1404
#ifdef CONFIG_PM
O
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1405
	.supports_autosuspend = 1,
1406
#endif
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1407 1408 1409 1410 1411 1412
};

/*
 * TTY driver structures.
 */

J
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1413
static const struct tty_operations acm_ops = {
L
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1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
	.open =			acm_tty_open,
	.close =		acm_tty_close,
	.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,
1445
	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
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1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
	acm_tty_driver->init_termios = tty_std_termios;
	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
	tty_set_operations(acm_tty_driver, &acm_ops);

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

1463 1464
	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       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);

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