Release 4.11 drivers/usb/class/cdc-acm.c

/*
 * cdc-acm.c
 *
 * Copyright (c) 1999 Armin Fuerst      <fuerst@in.tum.de>
 * Copyright (c) 1999 Pavel Machek      <pavel@ucw.cz>
 * Copyright (c) 1999 Johannes Erdfelt  <johannes@erdfelt.com>
 * Copyright (c) 2000 Vojtech Pavlik    <vojtech@suse.cz>
 * Copyright (c) 2004 Oliver Neukum     <oliver@neukum.name>
 * Copyright (c) 2005 David Kubicek     <dave@awk.cz>
 * Copyright (c) 2011 Johan Hovold      <jhovold@gmail.com>
 *
 * USB Abstract Control Model driver for USB modems and ISDN adapters
 *
 * Sponsored by SuSE
 *
 * 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

#undef VERBOSE_DEBUG

#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <linux/idr.h>
#include <linux/list.h>

#include "cdc-acm.h"



#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold"

#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"


static struct usb_driver acm_driver;

static struct tty_driver *acm_tty_driver;

static DEFINE_IDR(acm_minors);
static DEFINE_MUTEX(acm_minors_lock);

static void acm_tty_set_termios(struct tty_struct *tty,
				struct ktermios *termios_old);

/*
 * acm_minors accessors
 */

/*
 * Look up an ACM structure by minor. If found and not disconnected, increment
 * its refcount and return it with its mutex held.
 */


static struct acm *acm_get_by_minor(unsigned int minor)
{
	struct acm *acm;

	mutex_lock(&acm_minors_lock);
	acm = idr_find(&acm_minors, minor);
	if (acm) {
		mutex_lock(&acm->mutex);
		if (acm->disconnected) {
			mutex_unlock(&acm->mutex);
			acm = NULL;
		} else {
			tty_port_get(&acm->port);
			mutex_unlock(&acm->mutex);
		}
	}
	mutex_unlock(&acm_minors_lock);
	return acm;
}

Contributors
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CommitProp
Håvard Skinnemoen
78
82.11%
1
25.00%
Johan Hovold
12
12.63%
1
25.00%
Alan Cox
3
3.16%
1
25.00%
Linus Torvalds (pre-git)
2
2.11%
1
25.00%
Total
95
100.00%
4
100.00%

/*
 * Try to find an available minor number and if found, associate it with 'acm'.
 */


static int acm_alloc_minor(struct acm *acm)
{
	int minor;

	mutex_lock(&acm_minors_lock);
	minor = idr_alloc(&acm_minors, acm, 0, ACM_TTY_MINORS, GFP_KERNEL);
	mutex_unlock(&acm_minors_lock);

	return minor;
}

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Håvard Skinnemoen
29
64.44%
1
33.33%
Johan Hovold
13
28.89%
1
33.33%
Alan Cox
3
6.67%
1
33.33%
Total
45
100.00%
3
100.00%

/* Release the minor number associated with 'acm'.  */


static void acm_release_minor(struct acm *acm)
{
	mutex_lock(&acm_minors_lock);
	idr_remove(&acm_minors, acm->minor);
	mutex_unlock(&acm_minors_lock);
}

Contributors
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Håvard Skinnemoen
25
75.76%
1
50.00%
Johan Hovold
8
24.24%
1
50.00%
Total
33
100.00%
2
100.00%

/*
 * Functions for ACM control messages.
 */



static int acm_ctrl_msg(struct acm *acm, int request, int value,
							void *buf, int len)
{
	int retval;

	retval = usb_autopm_get_interface(acm->control);
	if (retval)
		return retval;

	retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
		request, USB_RT_ACM, value,
		acm->control->altsetting[0].desc.bInterfaceNumber,
		buf, len, 5000);

	dev_dbg(&acm->control->dev,
		"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
		__func__, request, value, len, retval);

	usb_autopm_put_interface(acm->control);

	return retval < 0 ? retval : 0;
}

Contributors
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Linus Torvalds (pre-git)
81
65.32%
8
61.54%
Johan Hovold
38
30.65%
2
15.38%
David Brownell
4
3.23%
2
15.38%
Nishanth Aravamudan
1
0.81%
1
7.69%
Total
124
100.00%
13
100.00%

/* devices aren't required to support these requests.
 * the cdc acm descriptor tells whether they do...
 */


static inline int acm_set_control(struct acm *acm, int control)
{
	if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
		return -EOPNOTSUPP;

	return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
			control, NULL, 0);
}

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Johan Hovold
35
85.37%
1
50.00%
Linus Torvalds (pre-git)
6
14.63%
1
50.00%
Total
41
100.00%
2
100.00%


#define acm_set_line(acm, line) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))

#define acm_send_break(acm, ms) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)



static void acm_kill_urbs(struct acm *acm)
{
	int i;

	usb_kill_urb(acm->ctrlurb);
	for (i = 0; i < ACM_NW; i++)
		usb_kill_urb(acm->wb[i].urb);
	for (i = 0; i < acm->rx_buflimit; i++)
		usb_kill_urb(acm->read_urbs[i]);
}

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Ladislav Michl
71
100.00%
1
100.00%
Total
71
100.00%
1
100.00%

/*
 * Write buffer management.
 * All of these assume proper locks taken by the caller.
 */



static int acm_wb_alloc(struct acm *acm)
{
	int i, wbn;
	struct acm_wb *wb;

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

Contributors
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Oliver Neukum
84
98.82%
2
66.67%
David Engraf
1
1.18%
1
33.33%
Total
85
100.00%
3
100.00%



static int acm_wb_is_avail(struct acm *acm)
{
	int i, n;
	unsigned long flags;

	n = ACM_NW;
	spin_lock_irqsave(&acm->write_lock, flags);
	for (i = 0; i < ACM_NW; i++)
		n -= acm->wb[i].use;
	spin_unlock_irqrestore(&acm->write_lock, flags);
	return n;
}

Contributors
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Oliver Neukum
47
66.20%
2
66.67%
David Brownell
24
33.80%
1
33.33%
Total
71
100.00%
3
100.00%

/*
 * Finish write. Caller must hold acm->write_lock
 */


static void acm_write_done(struct acm *acm, struct acm_wb *wb)
{
	wb->use = 0;
	acm->transmitting--;
	usb_autopm_put_interface_async(acm->control);
}

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Oliver Neukum
26
76.47%
3
75.00%
David Engraf
8
23.53%
1
25.00%
Total
34
100.00%
4
100.00%

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



static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
{
	int rc;

	acm->transmitting++;

	wb->urb->transfer_buffer = wb->buf;
	wb->urb->transfer_dma = wb->dmah;
	wb->urb->transfer_buffer_length = wb->len;
	wb->urb->dev = acm->dev;

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

Contributors
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CommitProp
Oliver Neukum
94
86.24%
1
33.33%
Johan Hovold
11
10.09%
1
33.33%
Alan Cox
4
3.67%
1
33.33%
Total
109
100.00%
3
100.00%

/*
 * 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);
}
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Oliver Neukum
52
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1
100.00%
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52
100.00%
1
100.00%

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;
}

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Oliver Neukum
58
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1
100.00%
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58
100.00%
1
100.00%

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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Oliver Neukum
52
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1
100.00%
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52
100.00%
1
100.00%

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

/* control interface reports status changes with "interrupt" transfers */


static void acm_ctrl_irq(struct urb *urb)
{
	struct acm *acm = urb->context;
	struct usb_cdc_notification *dr = urb->transfer_buffer;
	unsigned char *data;
	int newctrl;
	int difference;
	int retval;
	int status = urb->status;

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(&acm->control->dev,
			"%s - urb shutting down with status: %d\n",
			__func__, status);
		return;
	default:
		dev_dbg(&acm->control->dev,
			"%s - nonzero urb status received: %d\n",
			__func__, status);
		goto exit;
	}

	usb_mark_last_busy(acm->dev);

	data = (unsigned char *)(dr + 1);
	switch (dr->bNotificationType) {
	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
		dev_dbg(&acm->control->dev,
			"%s - network connection: %d\n", __func__, dr->wValue);
		break;

	case USB_CDC_NOTIFY_SERIAL_STATE:
		newctrl = get_unaligned_le16(data);

		if (!acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
			dev_dbg(&acm->control->dev,
				"%s - calling hangup\n", __func__);
			tty_port_tty_hangup(&acm->port, false);
		}

		difference = acm->ctrlin ^ newctrl;
		spin_lock(&acm->read_lock);
		acm->ctrlin = newctrl;
		acm->oldcount = acm->iocount;

		if (difference & ACM_CTRL_DSR)
			acm->iocount.dsr++;
		if (difference & ACM_CTRL_BRK)
			acm->iocount.brk++;
		if (difference & ACM_CTRL_RI)
			acm->iocount.rng++;
		if (difference & ACM_CTRL_DCD)
			acm->iocount.dcd++;
		if (difference & ACM_CTRL_FRAMING)
			acm->iocount.frame++;
		if (difference & ACM_CTRL_PARITY)
			acm->iocount.parity++;
		if (difference & ACM_CTRL_OVERRUN)
			acm->iocount.overrun++;
		spin_unlock(&acm->read_lock);

		if (difference)
			wake_up_all(&acm->wioctl);

		break;

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

Contributors
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CommitProp
Oliver Neukum
125
28.94%
3
12.00%
Linus Torvalds (pre-git)
124
28.70%
8
32.00%
Greg Kroah-Hartman
70
16.20%
3
12.00%
Johan Hovold
65
15.05%
3
12.00%
Linus Torvalds
28
6.48%
2
8.00%
David Brownell
8
1.85%
2
8.00%
Jiri Slaby
7
1.62%
1
4.00%
Harvey Harrison
4
0.93%
2
8.00%
Alan Cox
1
0.23%
1
4.00%
Total
432
100.00%
25
100.00%



static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
{
	int res;

	if (!test_and_clear_bit(index, &acm->read_urbs_free))
		return 0;

	res = usb_submit_urb(acm->read_urbs[index], mem_flags);
	if (res) {
		if (res != -EPERM) {
			dev_err(&acm->data->dev,
				"urb %d failed submission with %d\n",
				index, res);
		}
		set_bit(index, &acm->read_urbs_free);
		return res;
	} else {
		dev_vdbg(&acm->data->dev, "submitted urb %d\n", index);
	}

	return 0;
}

Contributors
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Johan Hovold
54
47.37%
2
22.22%
Oliver Neukum
26
22.81%
3
33.33%
David Brownell
19
16.67%
1
11.11%
David Kubicek
12
10.53%
1
11.11%
Linus Torvalds (pre-git)
3
2.63%
2
22.22%
Total
114
100.00%
9
100.00%



static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags)
{
	int res;
	int i;

	for (i = 0; i < acm->rx_buflimit; ++i) {
		res = acm_submit_read_urb(acm, i, mem_flags);
		if (res)
			return res;
	}

	return 0;
}

Contributors
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Johan Hovold
44
75.86%
1
20.00%
Oliver Neukum
11
18.97%
2
40.00%
David Kubicek
2
3.45%
1
20.00%
David Brownell
1
1.72%
1
20.00%
Total
58
100.00%
5
100.00%



static void acm_process_read_urb(struct acm *acm, struct urb *urb)
{
	if (!urb->actual_length)
		return;

	tty_insert_flip_string(&acm->port, urb->transfer_buffer,
			urb->actual_length);
	tty_flip_buffer_push(&acm->port);
}

Contributors
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Johan Hovold
12
25.00%
1
10.00%
Linus Torvalds (pre-git)
11
22.92%
3
30.00%
David Brownell
9
18.75%
1
10.00%
Jiri Slaby
8
16.67%
2
20.00%
Oliver Neukum
4
8.33%
1
10.00%
David Kubicek
2
4.17%
1
10.00%
Alan Cox
2
4.17%
1
10.00%
Total
48
100.00%
10
100.00%



static void acm_read_bulk_callback(struct urb *urb)
{
	struct acm_rb *rb = urb->context;
	struct acm *acm = rb->instance;
	unsigned long flags;
	int status = urb->status;

	dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
		rb->index, urb->actual_length, status);

	set_bit(rb->index, &acm->read_urbs_free);

	if (!acm->dev) {
		dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
		return;
	}

	switch (status) {
	case 0:
		usb_mark_last_busy(acm->dev);
		acm_process_read_urb(acm, urb);
		break;
	case -EPIPE:
		set_bit(EVENT_RX_STALL, &acm->flags);
		schedule_work(&acm->work);
		return;
	case -ENOENT:
	case -ECONNRESET:
	case -ESHUTDOWN:
		dev_dbg(&acm->data->dev,
			"%s - urb shutting down with status: %d\n",
			__func__, status);
		return;
	default:
		dev_dbg(&acm->data->dev,
			"%s - nonzero urb status received: %d\n",
			__func__, status);
		break;
	}

	/*
         * Unthrottle may run on another CPU which needs to see events
         * in the same order. Submission has an implict barrier
         */
	smp_mb__before_atomic();

	/* throttle device if requested by tty */
	spin_lock_irqsave(&acm->read_lock, flags);
	acm->throttled = acm->throttle_req;
	if (!acm->throttled) {
		spin_unlock_irqrestore(&acm->read_lock, flags);
		acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
	} else {
		spin_unlock_irqrestore(&acm->read_lock, flags);
	}
}

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Johan Hovold
93
36.05%
3
25.00%
Ladislav Michl
77
29.84%
1
8.33%
Oliver Neukum
41
15.89%
4
33.33%
David Kubicek
39
15.12%
1
8.33%
Arseniy Lartsev
4
1.55%
1
8.33%
Jarek Poplawski
3
1.16%
1
8.33%
Lu Baolu
1
0.39%
1
8.33%
Total
258
100.00%
12
100.00%

/* data interface wrote those outgoing bytes */


static void acm_write_bulk(struct urb *urb)
{
	struct acm_wb *wb = urb->context;
	struct acm *acm = wb->instance;
	unsigned long flags;
	int status = urb->status;

	if (status || (urb->actual_length != urb->transfer_buffer_length))
		dev_vdbg(&acm->data->dev, "wrote len %d/%d, status %d\n",
			urb->actual_length,
			urb->transfer_buffer_length,
			status);

	spin_lock_irqsave(&acm->write_lock, flags);
	acm_write_done(acm, wb);
	spin_unlock_irqrestore(&acm->write_lock, flags);
	set_bit(EVENT_TTY_WAKEUP, &acm->flags);
	schedule_work(&acm->work);
}

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David Brownell
38
31.40%
1
7.69%
Oliver Neukum
26
21.49%
5
38.46%
Brandon Philips
24
19.83%
1
7.69%
Linus Torvalds (pre-git)
16
13.22%
3
23.08%
Ladislav Michl
10
8.26%
1
7.69%
David Engraf
6
4.96%
1
7.69%
Johan Hovold
1
0.83%
1
7.69%
Total
121
100.00%
13
100.00%



static void acm_softint(struct work_struct *work)
{
	int i;
	struct acm *acm = container_of(work, struct acm, work);

	if (test_bit(EVENT_RX_STALL, &acm->flags)) {
		if (!(usb_autopm_get_interface(acm->data))) {
			for (i = 0; i < acm->rx_buflimit; i++)
				usb_kill_urb(acm->read_urbs[i]);
			usb_clear_halt(acm->dev, acm->in);
			acm_submit_read_urbs(acm, GFP_KERNEL);
			usb_autopm_put_interface(acm->data);
		}
		clear_bit(EVENT_RX_STALL, &acm->flags);
	}

	if (test_bit(EVENT_TTY_WAKEUP, &acm->flags)) {
		tty_port_tty_wakeup(&acm->port);
		clear_bit(EVENT_TTY_WAKEUP, &acm->flags);
	}
}

Contributors
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CommitProp
Ladislav Michl
115
77.18%
1
20.00%
Oliver Neukum
25
16.78%
1
20.00%
Alan Cox
4
2.68%
1
20.00%
Linus Torvalds (pre-git)
4
2.68%
1
20.00%
Jiri Slaby
1
0.67%
1
20.00%
Total
149
100.00%
5
100.00%

/*
 * TTY handlers
 */



static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
	struct acm *acm;
	int retval;

	acm = acm_get_by_minor(tty->index);
	if (!acm)
		return -ENODEV;

	retval = tty_standard_install(driver, tty);
	if (retval)
		goto error_init_termios;

	tty->driver_data = acm;

	return 0;

error_init_termios:
	tty_port_put(&acm->port);
	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Håvard Skinnemoen
35
43.75%
1
9.09%
Linus Torvalds (pre-git)
22
27.50%
3
27.27%
Oliver Neukum
11
13.75%
2
18.18%
David Engraf
5
6.25%
1
9.09%
Johan Hovold
3
3.75%
2
18.18%
Jiri Slaby
3
3.75%
1
9.09%
Al Viro
1
1.25%
1
9.09%
Total
80
100.00%
11
100.00%



static int acm_tty_open(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;

	return tty_port_open(&acm->port, tty, filp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Håvard Skinnemoen
27
71.05%
1
25.00%
Linus Torvalds (pre-git)
6
15.79%
2
50.00%
Alan Cox
5
13.16%
1
25.00%
Total
38
100.00%
4
100.00%



static void acm_port_dtr_rts(struct tty_port *port, int raise)
{
	struct acm *acm = container_of(port, struct acm, port);
	int val;
	int res;

	if (raise)
		val = ACM_CTRL_DTR | ACM_CTRL_RTS;
	else
		val = 0;

	/* FIXME: add missing ctrlout locking throughout driver */
	acm->ctrlout = val;

	res = acm_set_control(acm, val);
	if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
		dev_err(&acm->control->dev, "failed to set dtr/rts\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johan Hovold
90
100.00%
1
100.00%
Total
90
100.00%
1
100.00%



static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
{
	struct acm *acm = container_of(port, struct acm, port);
	int retval = -ENODEV;
	int i;

	mutex_lock(&acm->mutex);
	if (acm->disconnected)
		goto disconnected;

	retval = usb_autopm_get_interface(acm->control);
	if (retval)
		goto error_get_interface;

	/*
         * FIXME: Why do we need this? Allocating 64K of physically contiguous
         * memory is really nasty...
         */
	set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
	acm->control->needs_remote_wakeup = 1;

	acm->ctrlurb->dev = acm->dev;
	retval = usb_submit_urb(acm->ctrlurb, GFP_KERNEL);
	if (retval) {
		dev_err(&acm->control->dev,
			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
		goto error_submit_urb;
	}

	acm_tty_set_termios(tty, NULL);

	/*
         * Unthrottle device in case the TTY was closed while throttled.
         */
	spin_lock_irq(&acm->read_lock);
	acm->throttled = 0;
	acm->throttle_req = 0;
	spin_unlock_irq(&acm->read_lock);

	retval = acm_submit_read_urbs(acm, GFP_KERNEL);
	if (retval)
		goto error_submit_read_urbs;

	usb_autopm_put_interface(acm->control);

	mutex_unlock(&acm->mutex);

	return 0;

error_submit_read_urbs:
	for (i = 0; i < acm->rx_buflimit; i++)
		usb_kill_urb(acm->read_urbs[i]);
	usb_kill_urb(acm->ctrlurb);
error_submit_urb:
	usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
	mutex_unlock(&acm->mutex);

	return usb_translate_errors(retval);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Håvard Skinnemoen
80
29.96%
1
4.76%
Johan Hovold
76
28.46%
5
23.81%
Oliver Neukum
45
16.85%
6
28.57%
Otto Meta
29
10.86%
1
4.76%
Linus Torvalds (pre-git)
23
8.61%
4
19.05%
Jim Paris
7
2.62%
1
4.76%
Alan Cox
4
1.50%
1
4.76%
Greg Kroah-Hartman
3
1.12%
2
9.52%
Total
267
100.00%
21
100.00%



static void acm_port_destruct(struct tty_port *port)
{
	struct acm *acm = container_of(port, struct acm, port);

	acm_release_minor(acm);
	usb_put_intf(acm->control);
	kfree(acm->country_codes);
	kfree(acm);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Brian Murphy
26
52.00%
1
33.33%
Håvard Skinnemoen
17
34.00%
1
33.33%
Oliver Neukum
7
14.00%
1
33.33%
Total
50
100.00%
3
100.00%



static void acm_port_shutdown(struct tty_port *port)
{
	struct acm *acm = container_of(port, struct acm, port);
	struct urb *urb;
	struct acm_wb *wb;

	/*
         * Need to grab write_lock to prevent race with resume, but no need to
         * hold it due to the tty-port initialised flag.
         */
	spin_lock_irq(&acm->write_lock);
	spin_unlock_irq(&acm->write_lock);

	usb_autopm_get_interface_no_resume(acm->control);
	acm->control->needs_remote_wakeup = 0;
	usb_autopm_put_interface(acm->control);

	for (;;) {
		urb = usb_get_from_anchor(&acm->delayed);
		if (!urb)
			break;
		wb = urb->context;
		wb->use = 0;
		usb_autopm_put_interface_async(acm->control);
	}

	acm_kill_urbs(acm);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johan Hovold
80
65.57%
3
27.27%
Linus Torvalds (pre-git)
18
14.75%
5
45.45%
Håvard Skinnemoen
18
14.75%
1
9.09%
Oliver Neukum
5
4.10%
1
9.09%
Ladislav Michl
1
0.82%
1
9.09%
Total
122
100.00%
11
100.00%



static void acm_tty_cleanup(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;

	tty_port_put(&acm->port);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alan Cox
18
64.29%
1
20.00%
Håvard Skinnemoen
8
28.57%
2
40.00%
Linus Torvalds (pre-git)
2
7.14%
2
40.00%
Total
28
100.00%
5
100.00%



static void acm_tty_hangup(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;

	tty_port_hangup(&acm->port);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alan Cox
25
89.29%
1
33.33%
Håvard Skinnemoen
2
7.14%
1
33.33%
Francesco Lavra
1
3.57%
1
33.33%
Total
28
100.00%
3
100.00%



static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm = tty->driver_data;

	tty_port_close(&acm->port, tty, filp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Håvard Skinnemoen
26
70.27%
2
40.00%
Francesco Lavra
8
21.62%
1
20.00%
Oliver Neukum
2
5.41%
1
20.00%
Linus Torvalds (pre-git)
1
2.70%
1
20.00%
Total
37
100.00%
5
100.00%



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

	if (!count)
		return 0;

	dev_vdbg(&acm->data->dev, "%d bytes from tty layer\n", count);

	spin_lock_irqsave(&acm->write_lock, flags);
	wbn = acm_wb_alloc(acm);
	if (wbn < 0) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];

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

	count = (count > acm->writesize) ? acm->writesize : count;
	dev_vdbg(&acm->data->dev, "writing %d bytes\n", count);
	memcpy(wb->buf, buf, count);
	wb->len = count;

	stat = usb_autopm_get_interface_async(acm->control);
	if (stat) {
		wb->use = 0;
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return stat;
	}

	if (acm->susp_count) {
		if (acm->putbuffer) {
			/* now to preserve order */
			usb_anchor_urb(acm->putbuffer->urb, &acm->delayed);
			acm->putbuffer = NULL;
		}
		usb_anchor_urb(wb->urb, &acm->delayed);
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return count;
	} else {
		if (acm->putbuffer) {
			/* at this point there is no good way to handle errors */
			acm_start_wb(acm, acm->putbuffer);
			acm->putbuffer = NULL;
		}
	}

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

	if (stat < 0)
		return stat;
	return count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
128
37.21%
4
20.00%
Linus Torvalds (pre-git)
76
22.09%
6
30.00%
Greg Kroah-Hartman
66
19.19%
3
15.00%
Johan Hovold
55
15.99%
4
20.00%
David Brownell
10
2.91%
1
5.00%
Alan Cox
8
2.33%
1
5.00%
David Engraf
1
0.29%
1
5.00%
Total
344
100.00%
20
100.00%



static void acm_tty_flush_chars(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	struct acm_wb *cur = acm->putbuffer;
	int err;
	unsigned long flags;

	if (!cur) /* nothing to do */
		return;

	acm->putbuffer = NULL;
	err = usb_autopm_get_interface_async(acm->control);
	spin_lock_irqsave(&acm->write_lock, flags);
	if (err < 0) {
		cur->use = 0;
		acm->putbuffer = cur;
		goto out;
	}

	if (acm->susp_count)
		usb_anchor_urb(cur->urb, &acm->delayed);
	else
		acm_start_wb(acm, cur);
out:
	spin_unlock_irqrestore(&acm->write_lock, flags);
	return;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
130
100.00%
2
100.00%
Total
130
100.00%
2
100.00%



static int acm_tty_put_char(struct tty_struct *tty, unsigned char ch)
{
	struct acm *acm = tty->driver_data;
	struct acm_wb *cur;
	int wbn;
	unsigned long flags;

overflow:
	cur = acm->putbuffer;
	if (!cur) {
		spin_lock_irqsave(&acm->write_lock, flags);
		wbn = acm_wb_alloc(acm);
		if (wbn >= 0) {
			cur = &acm->wb[wbn];
			acm->putbuffer = cur;
		}
		spin_unlock_irqrestore(&acm->write_lock, flags);
		if (!cur)
			return 0;
	}

	if (cur->len == acm->writesize) {
		acm_tty_flush_chars(tty);
		goto overflow;
	}

	cur->buf[cur->len++] = ch;
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
145
100.00%
1
100.00%
Total
145
100.00%
1
100.00%



static int acm_tty_write_room(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	/*
         * Do not let the line discipline to know that we have a reserve,
         * or it might get too enthusiastic.
         */
	return acm_wb_is_avail(acm) ? acm->writesize : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
26
78.79%
4
80.00%
Oliver Neukum
7
21.21%
1
20.00%
Total
33
100.00%
5
100.00%



static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	/*
         * if the device was unplugged then any remaining characters fell out
         * of the connector ;)
         */
	if (acm->disconnected)
		return 0;
	/*
         * This is inaccurate (overcounts), but it works.
         */
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
31
68.89%
3
42.86%
Oliver Neukum
10
22.22%
2
28.57%
Håvard Skinnemoen
3
6.67%
1
14.29%
Alan Cox
1
2.22%
1
14.29%
Total
45
100.00%
7
100.00%



static void acm_tty_throttle(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;

	spin_lock_irq(&acm->read_lock);
	acm->throttle_req = 1;
	spin_unlock_irq(&acm->read_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
25
59.52%
6
75.00%
Oliver Neukum
12
28.57%
1
12.50%
Johan Hovold
5
11.90%
1
12.50%
Total
42
100.00%
8
100.00%



static void acm_tty_unthrottle(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	unsigned int was_throttled;

	spin_lock_irq(&acm->read_lock);
	was_throttled = acm->throttled;
	acm->throttled = 0;
	acm->throttle_req = 0;
	spin_unlock_irq(&acm->read_lock);

	if (was_throttled)
		acm_submit_read_urbs(acm, GFP_KERNEL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
29
42.03%
2
50.00%
Johan Hovold
28
40.58%
1
25.00%
Oliver Neukum
12
17.39%
1
25.00%
Total
69
100.00%
4
100.00%



static int acm_tty_break_ctl(struct tty_struct *tty, int state)
{
	struct acm *acm = tty->driver_data;
	int retval;

	retval = acm_send_break(acm, state ? 0xffff : 0);
	if (retval < 0)
		dev_dbg(&acm->control->dev,
			"%s - send break failed\n", __func__);
	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
36
58.06%
3
60.00%
Alan Cox
15
24.19%
1
20.00%
Johan Hovold
11
17.74%
1
20.00%
Total
62
100.00%
5
100.00%



static int acm_tty_tiocmget(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;

	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
81
97.59%
1
50.00%
Greg Kroah-Hartman
2
2.41%
1
50.00%
Total
83
100.00%
2
100.00%



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

	newctrl = acm->ctrlout;
	set = (set & TIOCM_DTR ? 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
61
52.59%
1
16.67%
Linus Torvalds (pre-git)
55
47.41%
5
83.33%
Total
116
100.00%
6
100.00%



static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
{
	struct serial_struct tmp;

	memset(&tmp, 0, sizeof(tmp));
	tmp.xmit_fifo_size = acm->writesize;
	tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
	tmp.close_delay	= acm->port.close_delay / 10;
	tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
				ASYNC_CLOSING_WAIT_NONE :
				acm->port.closing_wait / 10;

	if (copy_to_user(info, &tmp, sizeof(tmp)))
		return -EFAULT;
	else
		return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
78
69.64%
1
50.00%
Dan J Williams
34
30.36%
1
50.00%
Total
112
100.00%
2
100.00%



static int set_serial_info(struct acm *acm,
				struct serial_struct __user *newinfo)
{
	struct serial_struct new_serial;
	unsigned int closing_wait, close_delay;
	int retval = 0;

	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
		return -EFAULT;

	close_delay = new_serial.close_delay * 10;
	closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
			ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;

	mutex_lock(&acm->port.mutex);

	if (!capable(CAP_SYS_ADMIN)) {
		if ((close_delay != acm->port.close_delay) ||
		    (closing_wait != acm->port.closing_wait))
			retval = -EPERM;
		else
			retval = -EOPNOTSUPP;
	} else {
		acm->port.close_delay  = close_delay;
		acm->port.closing_wait = closing_wait;
	}

	mutex_unlock(&acm->port.mutex);
	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dan J Williams
160
100.00%
1
100.00%
Total
160
100.00%
1
100.00%



static int wait_serial_change(struct acm *acm, unsigned long arg)
{
	int rv = 0;
	DECLARE_WAITQUEUE(wait, current);
	struct async_icount old, new;

	do {
		spin_lock_irq(&acm->read_lock);
		old = acm->oldcount;
		new = acm->iocount;
		acm->oldcount = new;
		spin_unlock_irq(&acm->read_lock);

		if ((arg & TIOCM_DSR) &&
			old.dsr != new.dsr)
			break;
		if ((arg & TIOCM_CD)  &&
			old.dcd != new.dcd)
			break;
		if ((arg & TIOCM_RI) &&
			old.rng != new.rng)
			break;

		add_wait_queue(&acm->wioctl, &wait);
		set_current_state(TASK_INTERRUPTIBLE);
		schedule();
		remove_wait_queue(&acm->wioctl, &wait);
		if (acm->disconnected) {
			if (arg & TIOCM_CD)
				break;
			else
				rv = -ENODEV;
		} else {
			if (signal_pending(current))
				rv = -ERESTARTSYS;
		}
	} while (!rv);

	

	return rv;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
196
100.00%
1
100.00%
Total
196
100.00%
1
100.00%



static int acm_tty_get_icount(struct tty_struct *tty,
					struct serial_icounter_struct *icount)
{
	struct acm *acm = tty->driver_data;

	icount->dsr = acm->iocount.dsr;
	icount->rng = acm->iocount.rng;
	icount->dcd = acm->iocount.dcd;
	icount->frame = acm->iocount.frame;
	icount->overrun = acm->iocount.overrun;
	icount->parity = acm->iocount.parity;
	icount->brk = acm->iocount.brk;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
80
81.63%
1
50.00%
Johan Hovold
18
18.37%
1
50.00%
Total
98
100.00%
2
100.00%



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

	switch (cmd) {
	case TIOCGSERIAL: /* gets serial port data */
		rv = get_serial_info(acm, (struct serial_struct __user *) arg);
		break;
	case TIOCSSERIAL:
		rv = set_serial_info(acm, (struct serial_struct __user *) arg);
		break;
	case TIOCMIWAIT:
		rv = usb_autopm_get_interface(acm->control);
		if (rv < 0) {
			rv = -EIO;
			break;
		}
		rv = wait_serial_change(acm, arg);
		usb_autopm_put_interface(acm->control);
		break;
	}

	return rv;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
84
67.20%
3
42.86%
Dan J Williams
19
15.20%
1
14.29%
Greg Kroah-Hartman
18
14.40%
1
14.29%
Linus Torvalds (pre-git)
4
3.20%
2
28.57%
Total
125
100.00%
7
100.00%



static void acm_tty_set_termios(struct tty_struct *tty,
						struct ktermios *termios_old)
{
	struct acm *acm = tty->driver_data;
	struct ktermios *termios = &tty->termios;
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
				(termios->c_cflag & PARODD ? 1 : 2) +
				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
	switch (termios->c_cflag & CSIZE) {
	case CS5:
		newline.bDataBits = 5;
		break;
	case CS6:
		newline.bDataBits = 6;
		break;
	case CS7:
		newline.bDataBits = 7;
		break;
	case CS8:
	default:
		newline.bDataBits = 8;
		break;
	}
	/* FIXME: Needs to clear unsupported bits in the termios */
	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (C_BAUD(tty) == B0) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
	} else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
		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);
		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
			__func__,
			le32_to_cpu(newline.dwDTERate),
			newline.bCharFormat, newline.bParityType,
			newline.bDataBits);
		acm_set_line(acm, &acm->line);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
208
65.62%
7
43.75%
Nicolas Boullis
45
14.20%
1
6.25%
Johan Hovold
34
10.73%
2
12.50%
David Brownell
15
4.73%
1
6.25%
Alan Cox
9
2.84%
4
25.00%
Linus Torvalds
6
1.89%
1
6.25%
Total
317
100.00%
16
100.00%


static const struct tty_port_operations acm_port_ops = {
	.dtr_rts = acm_port_dtr_rts,
	.shutdown = acm_port_shutdown,
	.activate = acm_port_activate,
	.destruct = acm_port_destruct,
};

/*
 * USB probe and disconnect routines.
 */

/* Little helpers: write/read buffers free */


static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
		usb_free_coherent(acm->dev, acm->writesize, wb->buf, wb->dmah);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
60
93.75%
2
50.00%
Ladislav Michl
3
4.69%
1
25.00%
Daniel Mack
1
1.56%
1
25.00%
Total
64
100.00%
4
100.00%



static void acm_read_buffers_free(struct acm *acm)
{
	int i;

	for (i = 0; i < acm->rx_buflimit; i++)
		usb_free_coherent(acm->dev, acm->readsize,
			  acm->read_buffers[i].base, acm->read_buffers[i].dma);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
49
84.48%
1
20.00%
Johan Hovold
5
8.62%
2
40.00%
Ladislav Michl
3
5.17%
1
20.00%
Daniel Mack
1
1.72%
1
20.00%
Total
58
100.00%
5
100.00%

/* Little helper: write buffers allocate */


static int acm_write_buffers_alloc(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
		wb->buf = usb_alloc_coherent(acm->dev, acm->writesize, GFP_KERNEL,
		    &wb->dmah);
		if (!wb->buf) {
			while (i != 0) {
				--i;
				--wb;
				usb_free_coherent(acm->dev, acm->writesize,
				    wb->buf, wb->dmah);
			}
			return -ENOMEM;
		}
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
116
98.31%
2
66.67%
Daniel Mack
2
1.69%
1
33.33%
Total
118
100.00%
3
100.00%



static int acm_probe(struct usb_interface *intf,
		     const struct usb_device_id *id)
{
	struct usb_cdc_union_desc *union_header = NULL;
	struct usb_cdc_call_mgmt_descriptor *cmgmd = NULL;
	unsigned char *buffer = intf->altsetting->extra;
	int buflen = intf->altsetting->extralen;
	struct usb_interface *control_interface;
	struct usb_interface *data_interface;
	struct usb_endpoint_descriptor *epctrl = NULL;
	struct usb_endpoint_descriptor *epread = NULL;
	struct usb_endpoint_descriptor *epwrite = NULL;
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct usb_cdc_parsed_header h;
	struct acm *acm;
	int minor;
	int ctrlsize, readsize;
	u8 *buf;
	int call_intf_num = -1;
	int data_intf_num = -1;
	unsigned long quirks;
	int num_rx_buf;
	int i;
	int combined_interfaces = 0;
	struct device *tty_dev;
	int rv = -ENOMEM;

	/* normal quirks */
	quirks = (unsigned long)id->driver_info;

	if (quirks == IGNORE_DEVICE)
		return -ENODEV;

	memset(&h, 0x00, sizeof(struct usb_cdc_parsed_header));

	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
	if (quirks == NO_UNION_NORMAL) {
		data_interface = usb_ifnum_to_if(usb_dev, 1);
		control_interface = usb_ifnum_to_if(usb_dev, 0);
		/* we would crash */
		if (!data_interface || !control_interface)
			return -ENODEV;
		goto skip_normal_probe;
	}

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

	if (!intf->cur_altsetting)
		return -EINVAL;

	if (!buflen) {
		if (intf->cur_altsetting->endpoint &&
				intf->cur_altsetting->endpoint->extralen &&
				intf->cur_altsetting->endpoint->extra) {
			dev_dbg(&intf->dev,
				"Seeking extra descriptors on endpoint\n");
			buflen = intf->cur_altsetting->endpoint->extralen;
			buffer = intf->cur_altsetting->endpoint->extra;
		} else {
			dev_err(&intf->dev,
				"Zero length descriptor references\n");
			return -EINVAL;
		}
	}

	cdc_parse_cdc_header(&h, intf, buffer, buflen);
	union_header = h.usb_cdc_union_desc;
	cmgmd = h.usb_cdc_call_mgmt_descriptor;
	if (cmgmd)
		call_intf_num = cmgmd->bDataInterface;

	if (!union_header) {
		if (call_intf_num > 0) {
			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
			/* quirks for Droids MuIn LCD */
			if (quirks & NO_DATA_INTERFACE) {
				data_interface = usb_ifnum_to_if(usb_dev, 0);
			} else {
				data_intf_num = call_intf_num;
				data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
			}
			control_interface = intf;
		} else {
			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;
			}
		}
	} else {
		data_intf_num = union_header->bSlaveInterface0;
		control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
		data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
	}

	if (!control_interface || !data_interface) {
		dev_dbg(&intf->dev, "no interfaces\n");
		return -ENODEV;
	}
	if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
		return -ENODEV;

	if (data_intf_num != call_intf_num)
		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");

	if (control_interface == data_interface) {
		/* some broken devices designed for windows work this way */
		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
		combined_interfaces = 1;
		/* a popular other OS doesn't use it */
		quirks |= NO_CAP_LINE;
		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
			return -EINVAL;
		}
look_for_collapsed_interface:
		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;
	}

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) {
			dev_dbg(&intf->dev,
				"Your device has switched interfaces.\n");
			swap(control_interface, data_interface);
		} else {
			return -EINVAL;
		}
	}

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

	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
		/* valid in this context */
		dev_dbg(&intf->dev, "The data interface isn't available\n");
		return -EBUSY;
	}


	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
		return -EINVAL;

	epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
	epread = &data_interface->cur_altsetting->endpoint[0].desc;
	epwrite = &data_interface->cur_altsetting->endpoint[1].desc;


	/* workaround for switched endpoints */
	if (!usb_endpoint_dir_in(epread)) {
		/* descriptors are swapped */
		dev_dbg(&intf->dev,
			"The data interface has switched endpoints\n");
		swap(epread, epwrite);
	}
made_compressed_probe:
	dev_dbg(&intf->dev, "interfaces are valid\n");

	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
	if (acm == NULL)
		goto alloc_fail;

	minor = acm_alloc_minor(acm);
	if (minor < 0)
		goto alloc_fail1;

	ctrlsize = usb_endpoint_maxp(epctrl);
	readsize = usb_endpoint_maxp(epread) *
				(quirks == SINGLE_RX_URB ? 1 : 2);
	acm->combined_interfaces = combined_interfaces;
	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
	acm->control = control_interface;
	acm->data = data_interface;
	acm->minor = minor;
	acm->dev = usb_dev;
	if (h.usb_cdc_acm_descriptor)
		acm->ctrl_caps = h.usb_cdc_acm_descriptor->bmCapabilities;
	if (quirks & NO_CAP_LINE)
		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
	acm->ctrlsize = ctrlsize;
	acm->readsize = readsize;
	acm->rx_buflimit = num_rx_buf;
	INIT_WORK(&acm->work, acm_softint);
	init_waitqueue_head(&acm->wioctl);
	spin_lock_init(&acm->write_lock);
	spin_lock_init(&acm->read_lock);
	mutex_init(&acm->mutex);
	if (usb_endpoint_xfer_int(epread)) {
		acm->bInterval = epread->bInterval;
		acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
	} else {
		acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
	}
	if (usb_endpoint_xfer_int(epwrite))
		acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
	else
		acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
	tty_port_init(&acm->port);
	acm->port.ops = &acm_port_ops;
	init_usb_anchor(&acm->delayed);
	acm->quirks = quirks;

	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
	if (!buf)
		goto alloc_fail2;
	acm->ctrl_buffer = buf;

	if (acm_write_buffers_alloc(acm) < 0)
		goto alloc_fail4;

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb)
		goto alloc_fail5;

	for (i = 0; i < num_rx_buf; i++) {
		struct acm_rb *rb = &(acm->read_buffers[i]);
		struct urb *urb;

		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
								&rb->dma);
		if (!rb->base)
			goto alloc_fail6;
		rb->index = i;
		rb->instance = acm;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb)
			goto alloc_fail6;

		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		urb->transfer_dma = rb->dma;
		if (usb_endpoint_xfer_int(epread))
			usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
					 acm->readsize,
					 acm_read_bulk_callback, rb,
					 acm->bInterval);
		else
			usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
					  acm->readsize,
					  acm_read_bulk_callback, rb);

		acm->read_urbs[i] = urb;
		__set_bit(i, &acm->read_urbs_free);
	}
	for (i = 0; i < ACM_NW; i++) {
		struct acm_wb *snd = &(acm->wb[i]);

		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (snd->urb == NULL)
			goto alloc_fail7;

		if (usb_endpoint_xfer_int(epwrite))
			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
		else
			usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
				NULL, acm->writesize, acm_write_bulk, snd);
		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		if (quirks & SEND_ZERO_PACKET)
			snd->urb->transfer_flags |= URB_ZERO_PACKET;
		snd->instance = acm;
	}

	usb_set_intfdata(intf, acm);

	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
	if (i < 0)
		goto alloc_fail7;

	if (h.usb_cdc_country_functional_desc) { /* export the country data */
		struct usb_cdc_country_functional_desc * cfd =
					h.usb_cdc_country_functional_desc;

		acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
		if (!acm->country_codes)
			goto skip_countries;
		acm->country_code_size = cfd->bLength - 4;
		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
							cfd->bLength - 4);
		acm->country_rel_date = cfd->iCountryCodeRelDate;

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

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

skip_countries:
	usb_fill_int_urb(acm->ctrlurb, usb_dev,
			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
			 /* works around buggy devices */
			 epctrl->bInterval ? epctrl->bInterval : 16);
	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	acm->ctrlurb->transfer_dma = acm->ctrl_dma;

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

	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);
	usb_set_intfdata(data_interface, acm);

	usb_get_intf(control_interface);
	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
			&control_interface->dev);
	if (IS_ERR(tty_dev)) {
		rv = PTR_ERR(tty_dev);
		goto alloc_fail8;
	}

	if (quirks & CLEAR_HALT_CONDITIONS) {
		usb_clear_halt(usb_dev, acm->in);
		usb_clear_halt(usb_dev, acm->out);
	}

	return 0;
alloc_fail8:
	if (acm->country_codes) {
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
		kfree(acm->country_codes);
	}
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
alloc_fail7:
	usb_set_intfdata(intf, NULL);
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
alloc_fail6:
	for (i = 0; i < num_rx_buf; i++)
		usb_free_urb(acm->read_urbs[i]);
	acm_read_buffers_free(acm);
	usb_free_urb(acm->ctrlurb);
alloc_fail5:
	acm_write_buffers_free(acm);
alloc_fail4:
	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
alloc_fail2:
	acm_release_minor(acm);
alloc_fail1:
	kfree(acm);
alloc_fail:
	return rv;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
1130
51.13%
21
24.42%
Johan Hovold
168
7.60%
6
6.98%
Linus Torvalds (pre-git)
147
6.65%
13
15.12%
Alexey Khoroshilov
89
4.03%
1
1.16%
David Engraf
87
3.94%
1
1.16%
Ladislav Michl
83
3.76%
2
2.33%
David Kubicek
70
3.17%
1
1.16%
Greg Kroah-Hartman
62
2.81%
7
8.14%
Colin Leroy
57
2.58%
2
2.33%
David Brownell
47
2.13%
6
6.98%
Arseniy Lartsev
33
1.49%
1
1.16%
Alan Cox
32
1.45%
2
2.33%
Håvard Skinnemoen
25
1.13%
1
1.16%
Julia Lawall
23
1.04%
1
1.16%
Alexey Sokolov
22
1.00%
1
1.16%
Erik Slagter
20
0.90%
1
1.16%
Axel Lin
14
0.63%
1
1.16%
Lu Baolu
14
0.63%
1
1.16%
Alan Stern
12
0.54%
2
2.33%
Dmitry Torokhov
10
0.45%
1
1.16%
Sven Schnelle
10
0.45%
1
1.16%
Joe Perches
9
0.41%
2
2.33%
Fabian Frederick
8
0.36%
1
1.16%
Ingo Molnar
6
0.27%
1
1.16%
Jiri Slaby
6
0.27%
1
1.16%
Toby Gray
6
0.27%
1
1.16%
Brian Murphy
6
0.27%
1
1.16%
Luiz Fernando N. Capitulino
4
0.18%
1
1.16%
Kuninori Morimoto
3
0.14%
1
1.16%
Quentin Casasnovas
3
0.14%
1
1.16%
Daniel Mack
2
0.09%
1
1.16%
Catalin(ux aka Dino) M. Boie
1
0.05%
1
1.16%
Felipe Balbi
1
0.05%
1
1.16%
Total
2210
100.00%
86
100.00%



static void acm_disconnect(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);
	struct tty_struct *tty;

	/* sibling interface is already cleaning up */
	if (!acm)
		return;

	mutex_lock(&acm->mutex);
	acm->disconnected = true;
	if (acm->country_codes) {
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
	}
	wake_up_all(&acm->wioctl);
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
	mutex_unlock(&acm->mutex);

	tty = tty_port_tty_get(&acm->port);
	if (tty) {
		tty_vhangup(tty);
		tty_kref_put(tty);
	}

	acm_kill_urbs(acm);
	cancel_work_sync(&acm->work);

	tty_unregister_device(acm_tty_driver, acm->minor);

	acm_write_buffers_free(acm);
	usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
	acm_read_buffers_free(acm);

	if (!acm->combined_interfaces)
		usb_driver_release_interface(&acm_driver, intf == acm->control ?
					acm->data : acm->control);

	tty_port_put(&acm->port);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
103
42.92%
7
30.43%
Håvard Skinnemoen
54
22.50%
1
4.35%
Linus Torvalds (pre-git)
33
13.75%
5
21.74%
Greg Kroah-Hartman
12
5.00%
2
8.70%
Ladislav Michl
11
4.58%
2
8.70%
Alan Cox
10
4.17%
1
4.35%
Alan Stern
9
3.75%
1
4.35%
David Brownell
4
1.67%
2
8.70%
David Kubicek
3
1.25%
1
4.35%
Daniel Mack
1
0.42%
1
4.35%
Total
240
100.00%
23
100.00%

#ifdef CONFIG_PM


static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct acm *acm = usb_get_intfdata(intf);
	int cnt;

	spin_lock_irq(&acm->write_lock);
	if (PMSG_IS_AUTO(message)) {
		if (acm->transmitting) {
			spin_unlock_irq(&acm->write_lock);
			return -EBUSY;
		}
	}
	cnt = acm->susp_count++;
	spin_unlock_irq(&acm->write_lock);

	if (cnt)
		return 0;

	acm_kill_urbs(acm);
	cancel_work_sync(&acm->work);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
71
69.61%
2
33.33%
Johan Hovold
22
21.57%
3
50.00%
Ladislav Michl
9
8.82%
1
16.67%
Total
102
100.00%
6
100.00%



static int acm_resume(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);
	struct urb *urb;
	int rv = 0;

	spin_lock_irq(&acm->write_lock);

	if (--acm->susp_count)
		goto out;

	if (tty_port_initialized(&acm->port)) {
		rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);

		for (;;) {
			urb = usb_get_from_anchor(&acm->delayed);
			if (!urb)
				break;

			acm_start_wb(acm, urb->context);
		}

		/*
                 * delayed error checking because we must
                 * do the write path at all cost
                 */
		if (rv < 0)
			goto out;

		rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
	}
out:
	spin_unlock_irq(&acm->write_lock);

	return rv;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
85
62.50%
3
30.00%
Johan Hovold
46
33.82%
4
40.00%
Håvard Skinnemoen
3
2.21%
1
10.00%
Peter Hurley
1
0.74%
1
10.00%
Alan Cox
1
0.74%
1
10.00%
Total
136
100.00%
10
100.00%



static int acm_reset_resume(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);

	if (tty_port_initialized(&acm->port))
		tty_port_tty_hangup(&acm->port, false);

	return acm_resume(intf);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Francesco Lavra
40
85.11%
1
25.00%
Jiri Slaby
3
6.38%
1
25.00%
Håvard Skinnemoen
3
6.38%
1
25.00%
Peter Hurley
1
2.13%
1
25.00%
Total
47
100.00%
4
100.00%

#endif /* CONFIG_PM */



static int acm_pre_reset(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);

	clear_bit(EVENT_RX_STALL, &acm->flags);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ladislav Michl
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%


#define NOKIA_PCSUITE_ACM_INFO(x) \
		USB_DEVICE_AND_INTERFACE_INFO(0x0421, x, \
                USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
                USB_CDC_ACM_PROTO_VENDOR)


#define SAMSUNG_PCSUITE_ACM_INFO(x) \
		USB_DEVICE_AND_INTERFACE_INFO(0x04e7, x, \
                USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, \
                USB_CDC_ACM_PROTO_VENDOR)

/*
 * USB driver structure.
 */


static const struct usb_device_id acm_ids[] = {
	/* quirky and broken devices */
	{ USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
	{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
	.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
	{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB,
        },
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
	{ USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
	.driver_info = QUIRK_CONTROL_LINE_STATE, },
	{ USB_DEVICE(0x2184, 0x001c) },	/* GW Instek AFG-2225 */
	{ USB_DEVICE(0x2184, 0x0036) },	/* GW Instek AFG-125 */
	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
	},
	/* Motorola H24 HSPA module: */
	{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem                                */
	{ USB_DEVICE(0x22b8, 0x2d92),   /* modem           + diagnostics        */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},
	{ USB_DEVICE(0x22b8, 0x2d93),   /* modem + AT port                      */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},
	{ USB_DEVICE(0x22b8, 0x2d95),   /* modem + AT port + diagnostics        */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},
	{ USB_DEVICE(0x22b8, 0x2d96),   /* modem                         + NMEA */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},
	{ USB_DEVICE(0x22b8, 0x2d97),   /* modem           + diagnostics + NMEA */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},
	{ USB_DEVICE(0x22b8, 0x2d99),   /* modem + AT port               + NMEA */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},
	{ USB_DEVICE(0x22b8, 0x2d9a),   /* modem + AT port + diagnostics + NMEA */
	.driver_info = NO_UNION_NORMAL, /* handle only modem interface          */
	},

	{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
	.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
                                           data interface instead of
                                           communications interface.
                                           Maybe we should define a new
                                           quirk for this. */
	},
	{ USB_DEVICE(0x0572, 0x1340), /* Conexant CX93010-2x UCMxx */
	.driver_info = NO_UNION_NORMAL,
        },
	{ USB_DEVICE(0x05f9, 0x4002), /* PSC Scanning, Magellan 800i */
	.driver_info = NO_UNION_NORMAL,
        },
	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},
	{ USB_DEVICE(0x1576, 0x03b1), /* Maretron USB100 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},

	{ USB_DEVICE(0x2912, 0x0001), /* ATOL FPrint */
	.driver_info = CLEAR_HALT_CONDITIONS,
        },

	/* Nokia S60 phones expose two ACM channels. The first is
         * a modem and is picked up by the standard AT-command
         * information below. The second is 'vendor-specific' but
         * is treated as a serial device at the S60 end, so we want
         * to expose it on Linux too. */
	{ NOKIA_PCSUITE_ACM_INFO(0x042D), }, /* Nokia 3250 */
	{ NOKIA_PCSUITE_ACM_INFO(0x04D8), }, /* Nokia 5500 Sport */
	{ NOKIA_PCSUITE_ACM_INFO(0x04C9), }, /* Nokia E50 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0419), }, /* Nokia E60 */
	{ NOKIA_PCSUITE_ACM_INFO(0x044D), }, /* Nokia E61 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0001), }, /* Nokia E61i */
	{ NOKIA_PCSUITE_ACM_INFO(0x0475), }, /* Nokia E62 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0508), }, /* Nokia E65 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0418), }, /* Nokia E70 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0425), }, /* Nokia N71 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0486), }, /* Nokia N73 */
	{ NOKIA_PCSUITE_ACM_INFO(0x04DF), }, /* Nokia N75 */
	{ NOKIA_PCSUITE_ACM_INFO(0x000e), }, /* Nokia N77 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0445), }, /* Nokia N80 */
	{ NOKIA_PCSUITE_ACM_INFO(0x042F), }, /* Nokia N91 & N91 8GB */
	{ NOKIA_PCSUITE_ACM_INFO(0x048E), }, /* Nokia N92 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0420), }, /* Nokia N93 */
	{ NOKIA_PCSUITE_ACM_INFO(0x04E6), }, /* Nokia N93i  */
	{ NOKIA_PCSUITE_ACM_INFO(0x04B2), }, /* Nokia 5700 XpressMusic */
	{ NOKIA_PCSUITE_ACM_INFO(0x0134), }, /* Nokia 6110 Navigator (China) */
	{ NOKIA_PCSUITE_ACM_INFO(0x046E), }, /* Nokia 6110 Navigator */
	{ NOKIA_PCSUITE_ACM_INFO(0x002f), }, /* Nokia 6120 classic &  */
	{ NOKIA_PCSUITE_ACM_INFO(0x0088), }, /* Nokia 6121 classic */
	{ NOKIA_PCSUITE_ACM_INFO(0x00fc), }, /* Nokia 6124 classic */
	{ NOKIA_PCSUITE_ACM_INFO(0x0042), }, /* Nokia E51 */
	{ NOKIA_PCSUITE_ACM_INFO(0x00b0), }, /* Nokia E66 */
	{ NOKIA_PCSUITE_ACM_INFO(0x00ab), }, /* Nokia E71 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0481), }, /* Nokia N76 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0007), }, /* Nokia N81 & N81 8GB */
	{ NOKIA_PCSUITE_ACM_INFO(0x0071), }, /* Nokia N82 */
	{ NOKIA_PCSUITE_ACM_INFO(0x04F0), }, /* Nokia N95 & N95-3 NAM */
	{ NOKIA_PCSUITE_ACM_INFO(0x0070), }, /* Nokia N95 8GB  */
	{ NOKIA_PCSUITE_ACM_INFO(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 */
	{ NOKIA_PCSUITE_ACM_INFO(0x02e3), }, /* Nokia 5230, RM-588 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0178), }, /* Nokia E63 */
	{ NOKIA_PCSUITE_ACM_INFO(0x010e), }, /* Nokia E75 */
	{ NOKIA_PCSUITE_ACM_INFO(0x02d9), }, /* Nokia 6760 Slide */
	{ NOKIA_PCSUITE_ACM_INFO(0x01d0), }, /* Nokia E52 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0223), }, /* Nokia E72 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0275), }, /* Nokia X6 */
	{ NOKIA_PCSUITE_ACM_INFO(0x026c), }, /* Nokia N97 Mini */
	{ NOKIA_PCSUITE_ACM_INFO(0x0154), }, /* Nokia 5800 XpressMusic */
	{ NOKIA_PCSUITE_ACM_INFO(0x04ce), }, /* Nokia E90 */
	{ NOKIA_PCSUITE_ACM_INFO(0x01d4), }, /* Nokia E55 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0302), }, /* Nokia N8 */
	{ NOKIA_PCSUITE_ACM_INFO(0x0335), }, /* Nokia E7 */
	{ NOKIA_PCSUITE_ACM_INFO(0x03cd), }, /* Nokia C7 */
	{ SAMSUNG_PCSUITE_ACM_INFO(0x6651), }, /* Samsung GTi8510 (INNOV8) */

	/* Support for Owen devices */
	{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */

	/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */

	/* Support for Droids MuIn LCD */
	{ USB_DEVICE(0x04d8, 0x000b),
	.driver_info = NO_DATA_INTERFACE,
        },

#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
	{ USB_DEVICE(0x04d8, 0x0082),	/* Application mode */
	.driver_info = IGNORE_DEVICE,
        },
	{ USB_DEVICE(0x04d8, 0x0083),	/* Bootloader mode */
	.driver_info = IGNORE_DEVICE,
        },
#endif

	/*Samsung phone in firmware update mode */
	{ USB_DEVICE(0x04e8, 0x685d),
	.driver_info = IGNORE_DEVICE,
        },

	/* Exclude Infineon Flash Loader utility */
	{ USB_DEVICE(0x058b, 0x0041),
	.driver_info = IGNORE_DEVICE,
        },

	/* control interfaces without any protocol set */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_PROTO_NONE) },

	/* control interfaces with various AT-command sets */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_V25TER) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_PCCA101) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_GSM) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_3G) },
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
		USB_CDC_ACM_PROTO_AT_CDMA) },

	{ USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
	.driver_info = SEND_ZERO_PACKET,
        },

	{ }
};

MODULE_DEVICE_TABLE(usb, acm_ids);


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

/*
 * TTY driver structures.
 */


static const struct tty_operations acm_ops = {
	.install =		acm_tty_install,
	.open =			acm_tty_open,
	.close =		acm_tty_close,
	.cleanup =		acm_tty_cleanup,
	.hangup =		acm_tty_hangup,
	.write =		acm_tty_write,
	.put_char =		acm_tty_put_char,
	.flush_chars =		acm_tty_flush_chars,
	.write_room =		acm_tty_write_room,
	.ioctl =		acm_tty_ioctl,
	.throttle =		acm_tty_throttle,
	.unthrottle =		acm_tty_unthrottle,
	.chars_in_buffer =	acm_tty_chars_in_buffer,
	.break_ctl =		acm_tty_break_ctl,
	.set_termios =		acm_tty_set_termios,
	.tiocmget =		acm_tty_tiocmget,
	.tiocmset =		acm_tty_tiocmset,
	.get_icount =		acm_tty_get_icount,
};

/*
 * 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->driver_name = "acm",
	acm_tty_driver->name = "ttyACM",
	acm_tty_driver->major = ACM_TTY_MAJOR,
	acm_tty_driver->minor_start = 0,
	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
	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;
	}

	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
76
47.20%
1
7.69%
Linus Torvalds (pre-git)
54
33.54%
7
53.85%
Daniele Bellucci
17
10.56%
1
7.69%
Greg Kroah-Hartman
12
7.45%
3
23.08%
Linus Torvalds
2
1.24%
1
7.69%
Total
161
100.00%
13
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
20
64.52%
1
33.33%
Johannes Thumshirn
6
19.35%
1
33.33%
Al Viro
5
16.13%
1
33.33%
Total
31
100.00%
3
100.00%


module_init(acm_init);

module_exit(acm_exit);


MODULE_AUTHOR(DRIVER_AUTHOR);

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

MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
3417
35.24%
45
19.15%
Linus Torvalds (pre-git)
1291
13.32%
30
12.77%
Johan Hovold
1075
11.09%
26
11.06%
Håvard Skinnemoen
468
4.83%
2
0.85%
Ladislav Michl
422
4.35%
5
2.13%
Adrian Taylor
354
3.65%
1
0.43%
Greg Kroah-Hartman
317
3.27%
16
6.81%
David Brownell
247
2.55%
9
3.83%
Dan J Williams
213
2.20%
1
0.43%
Alan Cox
183
1.89%
10
4.26%
David Kubicek
132
1.36%
1
0.43%
Toby Gray
118
1.22%
3
1.28%
David Engraf
108
1.11%
2
0.85%
Alexey Khoroshilov
89
0.92%
1
0.43%
Al Viro
85
0.88%
2
0.85%
Krzysztof Hałasa
74
0.76%
1
0.43%
Linus Torvalds
59
0.61%
6
2.55%
Colin Leroy
57
0.59%
2
0.85%
Michael Ulbricht
56
0.58%
1
0.43%
Francesco Lavra
54
0.56%
2
0.85%
Dmitry Torokhov
48
0.50%
1
0.43%
Nicolas Boullis
45
0.46%
1
0.43%
Arseniy Lartsev
37
0.38%
1
0.43%
Alexey Sokolov
37
0.38%
1
0.43%
Erik Slagter
35
0.36%
1
0.43%
Brian Murphy
32
0.33%
1
0.43%
Lu Baolu
30
0.31%
2
0.85%
Otto Meta
29
0.30%
1
0.43%
Jiri Slaby
28
0.29%
6
2.55%
Rusty Russell
28
0.29%
1
0.43%
Brandon Philips
25
0.26%
1
0.43%
Julia Lawall
23
0.24%
1
0.43%
Jim Paris
22
0.23%
1
0.43%
Alan Stern
21
0.22%
2
0.85%
Eric Sandeen
17
0.18%
1
0.43%
Daniele Bellucci
17
0.18%
1
0.43%
Masahito Omote
17
0.18%
1
0.43%
Iain McFarlane
17
0.18%
1
0.43%
Adam J. Richter
17
0.18%
1
0.43%
Chris Malley
17
0.18%
1
0.43%
Russ Nelson
17
0.18%
1
0.43%
Andrey Arapov
17
0.18%
1
0.43%
Xiao Kaijian
17
0.18%
1
0.43%
Andrew Lunn
17
0.18%
1
0.43%
Kir Kolyshkin
17
0.18%
1
0.43%
David Cluytens
16
0.17%
1
0.43%
Björn Gerhart
16
0.17%
1
0.43%
Jean-Christian de Rivaz
15
0.15%
1
0.43%
Denis N Ladin
15
0.15%
1
0.43%
Jonas Jonsson
15
0.15%
1
0.43%
Axel Lin
14
0.14%
1
0.43%
Philippe Corbes
12
0.12%
1
0.43%
Denis Pershin
11
0.11%
1
0.43%
Dmitriy Taychenachev
11
0.11%
1
0.43%
Nathaniel Quillin
10
0.10%
1
0.43%
Sven Schnelle
10
0.10%
1
0.43%
Ingo Molnar
9
0.09%
2
0.85%
Joe Perches
9
0.09%
2
0.85%
Arvid Ephraim Picciani
8
0.08%
1
0.43%
Vojtech Pavlik
8
0.08%
1
0.43%
Przemo Firszt
8
0.08%
1
0.43%
Fabian Frederick
8
0.08%
1
0.43%
Daniel Mack
7
0.07%
1
0.43%
Johannes Thumshirn
6
0.06%
1
0.43%
Sarah Sharp
5
0.05%
1
0.43%
Scott James Remnant
5
0.05%
1
0.43%
Luiz Fernando N. Capitulino
4
0.04%
1
0.43%
Arjan van de Ven
4
0.04%
1
0.43%
Harvey Harrison
4
0.04%
2
0.85%
Kuninori Morimoto
3
0.03%
1
0.43%
Dave Jones
3
0.03%
1
0.43%
Quentin Casasnovas
3
0.03%
1
0.43%
Jarek Poplawski
3
0.03%
1
0.43%
Peter Hurley
2
0.02%
1
0.43%
Catalin(ux aka Dino) M. Boie
1
0.01%
1
0.43%
Nishanth Aravamudan
1
0.01%
1
0.43%
Jeff Dike
1
0.01%
1
0.43%
Felipe Balbi
1
0.01%
1
0.43%
Márton Németh
1
0.01%
1
0.43%
Total
9695
100.00%
235
100.00%
Directory: drivers/usb/class

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