cdc-acm.c 45.9 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
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 *	v0.12 - added TIOCM ioctls, added break handling, made struct acm
 *		kmalloced
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 *	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>
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#include <linux/serial.h>
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#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <asm/byteorder.h>
#include <asm/unaligned.h>
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#include <linux/list.h>
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#include "cdc-acm.h"

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#define 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->port.count)
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static const struct tty_port_operations acm_port_ops = {
};

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

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/*
 * Functions for ACM control messages.
 */

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

/* devices aren't required to support these requests.
 * the cdc acm descriptor tells whether they do...
 */
#define acm_set_control(acm, control) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
#define acm_set_line(acm, line) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
#define acm_send_break(acm, ms) \
	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)

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

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

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

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

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

/*
 * Poke write.
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 *
 * the caller is responsible for locking
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 */
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static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
{
	int rc;

	acm->transmitting++;

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

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	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
	if (rc < 0) {
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		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);
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	usb_autopm_get_interface_async(acm->control);
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	if (acm->susp_count) {
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		if (!acm->delayed_wb)
			acm->delayed_wb = wb;
		else
			usb_autopm_put_interface_async(acm->control);
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		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;	/* A white lie */
	}
	usb_mark_last_busy(acm->dev);

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

	return rc;
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}
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/*
 * attributes exported through sysfs
 */
static ssize_t show_caps
(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct acm *acm = usb_get_intfdata(intf);

	return sprintf(buf, "%d", acm->ctrl_caps);
}
static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);

static ssize_t show_country_codes
(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct acm *acm = usb_get_intfdata(intf);

	memcpy(buf, acm->country_codes, acm->country_code_size);
	return acm->country_code_size;
}

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

static ssize_t show_country_rel_date
(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct acm *acm = usb_get_intfdata(intf);

	return sprintf(buf, "%d", acm->country_rel_date);
}
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static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
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/*
 * Interrupt handlers for various ACM device responses
 */

/* control interface reports status changes with "interrupt" transfers */
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static void acm_ctrl_irq(struct urb *urb)
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{
	struct acm *acm = urb->context;
	struct usb_cdc_notification *dr = urb->transfer_buffer;
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	struct tty_struct *tty;
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	unsigned char *data;
	int newctrl;
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	int retval;
	int status = urb->status;
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	switch (status) {
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	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
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		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) {
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	case USB_CDC_NOTIFY_NETWORK_CONNECTION:
		dbg("%s network", dr->wValue ?
					"connected to" : "disconnected from");
		break;
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	case USB_CDC_NOTIFY_SERIAL_STATE:
		tty = tty_port_tty_get(&acm->port);
		newctrl = get_unaligned_le16(data);
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		if (tty) {
			if (!acm->clocal &&
				(acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
				dbg("calling hangup");
				tty_hangup(tty);
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			}
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			tty_kref_put(tty);
		}
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		acm->ctrlin = newctrl;
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		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 ? '+' : '-');
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			break;

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	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;
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	}
exit:
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	usb_mark_last_busy(acm->dev);
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	retval = usb_submit_urb(urb, GFP_ATOMIC);
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	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;
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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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	tty = tty_port_tty_get(&acm->port);

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next_buffer:
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	spin_lock_irqsave(&acm->read_lock, flags);
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	if (list_empty(&acm->filled_read_bufs)) {
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		spin_unlock_irqrestore(&acm->read_lock, flags);
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		goto urbs;
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	}
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	buf = list_entry(acm->filled_read_bufs.next,
			 struct acm_rb, list);
	list_del(&buf->list);
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	spin_unlock_irqrestore(&acm->read_lock, flags);
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	dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
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	if (tty) {
		spin_lock_irqsave(&acm->throttle_lock, flags);
		throttled = acm->throttle;
		spin_unlock_irqrestore(&acm->throttle_lock, flags);
		if (!throttled) {
			tty_buffer_request_room(tty, buf->size);
			tty_insert_flip_string(tty, buf->base, buf->size);
			tty_flip_buffer_push(tty);
		} else {
			tty_kref_put(tty);
			dbg("Throttling noticed");
			spin_lock_irqsave(&acm->read_lock, flags);
			list_add(&buf->list, &acm->filled_read_bufs);
			spin_unlock_irqrestore(&acm->read_lock, flags);
			return;
		}
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	}

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

urbs:
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	tty_kref_put(tty);

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

		rcv->buffer = buf;

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

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		/* This shouldn't kill the driver as unsuccessful URBs are
		   returned to the free-urbs-pool and resubmited ASAP */
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		spin_lock_irqsave(&acm->read_lock, flags);
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		if (acm->susp_count ||
				usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
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			list_add(&buf->list, &acm->spare_read_bufs);
			list_add(&rcv->list, &acm->spare_read_urbs);
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			acm->processing = 0;
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			spin_unlock_irqrestore(&acm->read_lock, flags);
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			return;
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		} else {
			spin_unlock_irqrestore(&acm->read_lock, flags);
			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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	unsigned long flags;
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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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	spin_lock_irqsave(&acm->write_lock, flags);
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	acm_write_done(acm, wb);
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	spin_unlock_irqrestore(&acm->write_lock, flags);
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	if (ACM_READY(acm))
		schedule_work(&acm->work);
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	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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	struct tty_struct *tty;
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	dev_vdbg(&acm->data->dev, "tx work\n");
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	if (!ACM_READY(acm))
		return;
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	tty = tty_port_tty_get(&acm->port);
	tty_wakeup(tty);
	tty_kref_put(tty);
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}

/*
 * TTY handlers
 */

static int acm_tty_open(struct tty_struct *tty, struct file *filp)
{
	struct acm *acm;
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	int rv = -ENODEV;
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	int i;
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	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;
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563
	tty_port_tty_set(&acm->port, tty);
L
Linus Torvalds 已提交
564

565 566
	if (usb_autopm_get_interface(acm->control) < 0)
		goto early_bail;
567 568
	else
		acm->control->needs_remote_wakeup = 1;
O
Oliver Neukum 已提交
569 570

	mutex_lock(&acm->mutex);
A
Alan Cox 已提交
571
	if (acm->port.count++) {
O
Oliver Neukum 已提交
572
		usb_autopm_put_interface(acm->control);
L
Linus Torvalds 已提交
573
		goto done;
A
Alan Cox 已提交
574
	}
O
Oliver Neukum 已提交
575

L
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576 577 578 579 580 581
	acm->ctrlurb->dev = acm->dev;
	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
		dbg("usb_submit_urb(ctrl irq) failed");
		goto bail_out;
	}

582 583
	if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
L
Linus Torvalds 已提交
584
		goto full_bailout;
A
Alan Cox 已提交
585

586
	usb_autopm_put_interface(acm->control);
L
Linus Torvalds 已提交
587

588 589 590
	INIT_LIST_HEAD(&acm->spare_read_urbs);
	INIT_LIST_HEAD(&acm->spare_read_bufs);
	INIT_LIST_HEAD(&acm->filled_read_bufs);
591 592

	for (i = 0; i < acm->rx_buflimit; i++)
593
		list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
594
	for (i = 0; i < acm->rx_buflimit; i++)
595 596
		list_add(&(acm->rb[i].list), &acm->spare_read_bufs);

597 598
	acm->throttle = 0;

599
	set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
A
Alan Cox 已提交
600
	rv = tty_port_block_til_ready(&acm->port, tty, filp);
601
	tasklet_schedule(&acm->urb_task);
L
Linus Torvalds 已提交
602
done:
O
Oliver Neukum 已提交
603
	mutex_unlock(&acm->mutex);
604
err_out:
605
	mutex_unlock(&open_mutex);
L
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	return rv;

full_bailout:
	usb_kill_urb(acm->ctrlurb);
bail_out:
O
Oliver Neukum 已提交
611
	usb_autopm_put_interface(acm->control);
A
Alan Cox 已提交
612
	acm->port.count--;
O
Oliver Neukum 已提交
613
	mutex_unlock(&acm->mutex);
614 615
early_bail:
	mutex_unlock(&open_mutex);
A
Alan Cox 已提交
616
	tty_port_tty_set(&acm->port, NULL);
L
Linus Torvalds 已提交
617 618 619
	return -EIO;
}

620 621
static void acm_tty_unregister(struct acm *acm)
{
A
Alan Cox 已提交
622
	int i, nr;
623

624
	nr = acm->rx_buflimit;
625 626 627 628
	tty_unregister_device(acm_tty_driver, acm->minor);
	usb_put_intf(acm->control);
	acm_table[acm->minor] = NULL;
	usb_free_urb(acm->ctrlurb);
629 630
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
631
	for (i = 0; i < nr; i++)
632
		usb_free_urb(acm->ru[i].urb);
633
	kfree(acm->country_codes);
634 635 636
	kfree(acm);
}

637 638
static int acm_tty_chars_in_buffer(struct tty_struct *tty);

A
Alan Cox 已提交
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
static void acm_port_down(struct acm *acm, int drain)
{
	int i, nr = acm->rx_buflimit;
	mutex_lock(&open_mutex);
	if (acm->dev) {
		usb_autopm_get_interface(acm->control);
		acm_set_control(acm, acm->ctrlout = 0);
		/* try letting the last writes drain naturally */
		if (drain) {
			wait_event_interruptible_timeout(acm->drain_wait,
				(ACM_NW == acm_wb_is_avail(acm)) || !acm->dev,
					ACM_CLOSE_TIMEOUT * HZ);
		}
		usb_kill_urb(acm->ctrlurb);
		for (i = 0; i < ACM_NW; i++)
			usb_kill_urb(acm->wb[i].urb);
		for (i = 0; i < nr; i++)
			usb_kill_urb(acm->ru[i].urb);
		acm->control->needs_remote_wakeup = 0;
		usb_autopm_put_interface(acm->control);
	}
	mutex_unlock(&open_mutex);
}

static void acm_tty_hangup(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	tty_port_hangup(&acm->port);
	acm_port_down(acm, 0);
}

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

A
Alan Cox 已提交
674 675
	/* Perform the closing process and see if we need to do the hardware
	   shutdown */
676
	if (!acm)
L
Linus Torvalds 已提交
677
		return;
678 679 680 681 682 683 684 685 686 687
	if (tty_port_close_start(&acm->port, tty, filp) == 0) {
		mutex_lock(&open_mutex);
		if (!acm->dev) {
			tty_port_tty_set(&acm->port, NULL);
			acm_tty_unregister(acm);
			tty->driver_data = NULL;
		}
		mutex_unlock(&open_mutex);
		return;
	}
A
Alan Cox 已提交
688 689 690
	acm_port_down(acm, 0);
	tty_port_close_end(&acm->port, tty);
	tty_port_tty_set(&acm->port, NULL);
L
Linus Torvalds 已提交
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}

693 694
static int acm_tty_write(struct tty_struct *tty,
					const unsigned char *buf, int count)
L
Linus Torvalds 已提交
695 696 697
{
	struct acm *acm = tty->driver_data;
	int stat;
698 699 700 701
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;

702
	dbg("Entering acm_tty_write to write %d bytes,", count);
L
Linus Torvalds 已提交
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	if (!ACM_READY(acm))
		return -EINVAL;
	if (!count)
		return 0;

709
	spin_lock_irqsave(&acm->write_lock, flags);
710 711
	wbn = acm_wb_alloc(acm);
	if (wbn < 0) {
712 713 714 715
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];
L
Linus Torvalds 已提交
716

717
	count = (count > acm->writesize) ? acm->writesize : count;
L
Linus Torvalds 已提交
718
	dbg("Get %d bytes...", count);
719 720 721
	memcpy(wb->buf, buf, count);
	wb->len = count;
	spin_unlock_irqrestore(&acm->write_lock, flags);
L
Linus Torvalds 已提交
722

723 724
	stat = acm_write_start(acm, wbn);
	if (stat < 0)
L
Linus Torvalds 已提交
725 726 727 728 729 730 731 732 733
		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;
734 735 736 737
	/*
	 * Do not let the line discipline to know that we have a reserve,
	 * or it might get too enthusiastic.
	 */
738
	return acm_wb_is_avail(acm) ? acm->writesize : 0;
L
Linus Torvalds 已提交
739 740 741 742 743 744
}

static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
	struct acm *acm = tty->driver_data;
	if (!ACM_READY(acm))
A
Alan Cox 已提交
745
		return 0;
746 747 748
	/*
	 * This is inaccurate (overcounts), but it works.
	 */
749
	return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
L
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750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
}

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);
770
	tasklet_schedule(&acm->urb_task);
L
Linus Torvalds 已提交
771 772
}

A
Alan Cox 已提交
773
static int acm_tty_break_ctl(struct tty_struct *tty, int state)
L
Linus Torvalds 已提交
774 775
{
	struct acm *acm = tty->driver_data;
A
Alan Cox 已提交
776
	int retval;
L
Linus Torvalds 已提交
777
	if (!ACM_READY(acm))
A
Alan Cox 已提交
778 779 780
		return -EINVAL;
	retval = acm_send_break(acm, state ? 0xffff : 0);
	if (retval < 0)
L
Linus Torvalds 已提交
781
		dbg("send break failed");
A
Alan Cox 已提交
782
	return retval;
L
Linus Torvalds 已提交
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
}

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;
810 811 812 813
	set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
					(set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
	clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) |
					(clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
L
Linus Torvalds 已提交
814 815 816 817 818 819 820 821

	newctrl = (newctrl & ~clear) | set;

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

822 823
static int acm_tty_ioctl(struct tty_struct *tty, struct file *file,
					unsigned int cmd, unsigned long arg)
L
Linus Torvalds 已提交
824 825 826 827 828 829 830 831 832
{
	struct acm *acm = tty->driver_data;

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

	return -ENOIOCTLCMD;
}

833
static const __u32 acm_tty_speed[] = {
L
Linus Torvalds 已提交
834 835 836 837 838 839 840
	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
};

841
static const __u8 acm_tty_size[] = {
L
Linus Torvalds 已提交
842 843 844
	5, 6, 7, 8
};

845 846
static void acm_tty_set_termios(struct tty_struct *tty,
						struct ktermios *termios_old)
L
Linus Torvalds 已提交
847 848
{
	struct acm *acm = tty->driver_data;
A
Alan Cox 已提交
849
	struct ktermios *termios = tty->termios;
L
Linus Torvalds 已提交
850 851 852 853 854 855
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	if (!ACM_READY(acm))
		return;

856
	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
L
Linus Torvalds 已提交
857 858
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
859 860
				(termios->c_cflag & PARODD ? 1 : 2) +
				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
L
Linus Torvalds 已提交
861
	newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
862
	/* FIXME: Needs to clear unsupported bits in the termios */
L
Linus Torvalds 已提交
863 864 865 866 867
	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (!newline.dwDTERate) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
868 869
	} else
		newctrl |=  ACM_CTRL_DTR;
L
Linus Torvalds 已提交
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886

	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.
 */

887
/* Little helpers: write/read buffers free */
888 889 890 891
static void acm_write_buffers_free(struct acm *acm)
{
	int i;
	struct acm_wb *wb;
O
Oliver Neukum 已提交
892
	struct usb_device *usb_dev = interface_to_usbdev(acm->control);
893

894
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
O
Oliver Neukum 已提交
895
		usb_buffer_free(usb_dev, acm->writesize, wb->buf, wb->dmah);
896 897
}

898 899 900 901 902 903
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++)
904 905
		usb_buffer_free(usb_dev, acm->readsize,
					acm->rb[i].base, acm->rb[i].dma);
906 907
}

908 909 910 911 912 913
/* Little helper: write buffers allocate */
static int acm_write_buffers_alloc(struct acm *acm)
{
	int i;
	struct acm_wb *wb;

914
	for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
		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;
}

A
Alan Cox 已提交
930 931
static int acm_probe(struct usb_interface *intf,
		     const struct usb_device_id *id)
L
Linus Torvalds 已提交
932 933
{
	struct usb_cdc_union_desc *union_header = NULL;
934
	struct usb_cdc_country_functional_desc *cfd = NULL;
D
David Brownell 已提交
935
	unsigned char *buffer = intf->altsetting->extra;
L
Linus Torvalds 已提交
936 937 938
	int buflen = intf->altsetting->extralen;
	struct usb_interface *control_interface;
	struct usb_interface *data_interface;
939 940 941
	struct usb_endpoint_descriptor *epctrl = NULL;
	struct usb_endpoint_descriptor *epread = NULL;
	struct usb_endpoint_descriptor *epwrite = NULL;
L
Linus Torvalds 已提交
942 943 944
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct acm *acm;
	int minor;
945
	int ctrlsize, readsize;
L
Linus Torvalds 已提交
946 947 948 949 950 951
	u8 *buf;
	u8 ac_management_function = 0;
	u8 call_management_function = 0;
	int call_interface_num = -1;
	int data_interface_num;
	unsigned long quirks;
952
	int num_rx_buf;
953
	int i;
954
	int combined_interfaces = 0;
L
Linus Torvalds 已提交
955

956
	/* normal quirks */
L
Linus Torvalds 已提交
957
	quirks = (unsigned long)id->driver_info;
958 959 960
	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;

	/* handle quirks deadly to normal probing*/
L
Linus Torvalds 已提交
961 962 963 964 965
	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;
	}
966

L
Linus Torvalds 已提交
967 968
	/* normal probing*/
	if (!buffer) {
969
		dev_err(&intf->dev, "Weird descriptor references\n");
L
Linus Torvalds 已提交
970 971 972 973
		return -EINVAL;
	}

	if (!buflen) {
974 975 976 977
		if (intf->cur_altsetting->endpoint->extralen &&
				intf->cur_altsetting->endpoint->extra) {
			dev_dbg(&intf->dev,
				"Seeking extra descriptors on endpoint\n");
L
Linus Torvalds 已提交
978 979 980
			buflen = intf->cur_altsetting->endpoint->extralen;
			buffer = intf->cur_altsetting->endpoint->extra;
		} else {
981 982
			dev_err(&intf->dev,
				"Zero length descriptor references\n");
L
Linus Torvalds 已提交
983 984 985 986 987
			return -EINVAL;
		}
	}

	while (buflen > 0) {
988
		if (buffer[1] != USB_DT_CS_INTERFACE) {
989
			dev_err(&intf->dev, "skipping garbage\n");
L
Linus Torvalds 已提交
990 991 992
			goto next_desc;
		}

993 994 995 996 997 998
		switch (buffer[2]) {
		case USB_CDC_UNION_TYPE: /* we've found it */
			if (union_header) {
				dev_err(&intf->dev, "More than one "
					"union descriptor, skipping ...\n");
				goto next_desc;
L
Linus Torvalds 已提交
999
			}
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
			union_header = (struct usb_cdc_union_desc *)buffer;
			break;
		case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
			cfd = (struct usb_cdc_country_functional_desc *)buffer;
			break;
		case USB_CDC_HEADER_TYPE: /* maybe check version */
			break; /* for now we ignore it */
		case USB_CDC_ACM_TYPE:
			ac_management_function = buffer[3];
			break;
		case USB_CDC_CALL_MANAGEMENT_TYPE:
			call_management_function = buffer[3];
			call_interface_num = buffer[4];
			if ((call_management_function & 3) != 3)
				dev_err(&intf->dev, "This device cannot do calls on its own. It is not a modem.\n");
			break;
		default:
			/* there are LOTS more CDC descriptors that
			 * could legitimately be found here.
			 */
			dev_dbg(&intf->dev, "Ignoring descriptor: "
					"type %02x, length %d\n",
					buffer[2], buffer[0]);
			break;
		}
L
Linus Torvalds 已提交
1025 1026 1027 1028 1029 1030 1031
next_desc:
		buflen -= buffer[0];
		buffer += buffer[0];
	}

	if (!union_header) {
		if (call_interface_num > 0) {
1032
			dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
L
Linus Torvalds 已提交
1033 1034 1035
			data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
			control_interface = intf;
		} else {
1036 1037 1038 1039 1040 1041 1042 1043 1044
			if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
				dev_dbg(&intf->dev,"No union descriptor, giving up\n");
				return -ENODEV;
			} else {
				dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
				combined_interfaces = 1;
				control_interface = data_interface = intf;
				goto look_for_collapsed_interface;
			}
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049
		}
	} 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) {
1050
			dev_dbg(&intf->dev, "no interfaces\n");
L
Linus Torvalds 已提交
1051 1052 1053
			return -ENODEV;
		}
	}
1054

L
Linus Torvalds 已提交
1055
	if (data_interface_num != call_interface_num)
1056
		dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
L
Linus Torvalds 已提交
1057

1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
	if (control_interface == data_interface) {
		/* some broken devices designed for windows work this way */
		dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
		combined_interfaces = 1;
		/* a popular other OS doesn't use it */
		quirks |= NO_CAP_LINE;
		if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
			dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
			return -EINVAL;
		}
look_for_collapsed_interface:
		for (i = 0; i < 3; i++) {
			struct usb_endpoint_descriptor *ep;
			ep = &data_interface->cur_altsetting->endpoint[i].desc;

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

L
Linus Torvalds 已提交
1088 1089 1090
skip_normal_probe:

	/*workaround for switched interfaces */
1091 1092 1093 1094
	if (data_interface->cur_altsetting->desc.bInterfaceClass
						!= CDC_DATA_INTERFACE_TYPE) {
		if (control_interface->cur_altsetting->desc.bInterfaceClass
						== CDC_DATA_INTERFACE_TYPE) {
L
Linus Torvalds 已提交
1095
			struct usb_interface *t;
1096 1097
			dev_dbg(&intf->dev,
				"Your device has switched interfaces.\n");
L
Linus Torvalds 已提交
1098 1099 1100 1101 1102 1103 1104
			t = control_interface;
			control_interface = data_interface;
			data_interface = t;
		} else {
			return -EINVAL;
		}
	}
1105 1106

	/* Accept probe requests only for the control interface */
1107
	if (!combined_interfaces && intf != control_interface)
1108
		return -ENODEV;
1109

1110 1111
	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
		/* valid in this context */
1112
		dev_dbg(&intf->dev, "The data interface isn't available\n");
L
Linus Torvalds 已提交
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
		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 */
1126
	if (!usb_endpoint_dir_in(epread)) {
L
Linus Torvalds 已提交
1127 1128
		/* descriptors are swapped */
		struct usb_endpoint_descriptor *t;
1129 1130
		dev_dbg(&intf->dev,
			"The data interface has switched endpoints\n");
L
Linus Torvalds 已提交
1131 1132 1133 1134
		t = epread;
		epread = epwrite;
		epwrite = t;
	}
1135
made_compressed_probe:
L
Linus Torvalds 已提交
1136 1137 1138 1139
	dbg("interfaces are valid");
	for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);

	if (minor == ACM_TTY_MINORS) {
1140
		dev_err(&intf->dev, "no more free acm devices\n");
L
Linus Torvalds 已提交
1141 1142 1143
		return -ENODEV;
	}

1144 1145
	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
	if (acm == NULL) {
1146
		dev_dbg(&intf->dev, "out of memory (acm kzalloc)\n");
L
Linus Torvalds 已提交
1147 1148 1149 1150
		goto alloc_fail;
	}

	ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
1151 1152
	readsize = le16_to_cpu(epread->wMaxPacketSize) *
				(quirks == SINGLE_RX_URB ? 1 : 2);
1153
	acm->combined_interfaces = combined_interfaces;
1154
	acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
L
Linus Torvalds 已提交
1155 1156 1157 1158 1159
	acm->control = control_interface;
	acm->data = data_interface;
	acm->minor = minor;
	acm->dev = usb_dev;
	acm->ctrl_caps = ac_management_function;
1160 1161
	if (quirks & NO_CAP_LINE)
		acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
L
Linus Torvalds 已提交
1162 1163
	acm->ctrlsize = ctrlsize;
	acm->readsize = readsize;
1164
	acm->rx_buflimit = num_rx_buf;
1165 1166
	acm->urb_task.func = acm_rx_tasklet;
	acm->urb_task.data = (unsigned long) acm;
D
David Howells 已提交
1167
	INIT_WORK(&acm->work, acm_softint);
1168
	init_waitqueue_head(&acm->drain_wait);
L
Linus Torvalds 已提交
1169
	spin_lock_init(&acm->throttle_lock);
1170
	spin_lock_init(&acm->write_lock);
1171
	spin_lock_init(&acm->read_lock);
O
Oliver Neukum 已提交
1172
	mutex_init(&acm->mutex);
1173
	acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
1174 1175 1176
	acm->is_int_ep = usb_endpoint_xfer_int(epread);
	if (acm->is_int_ep)
		acm->bInterval = epread->bInterval;
A
Alan Cox 已提交
1177 1178
	tty_port_init(&acm->port);
	acm->port.ops = &acm_port_ops;
L
Linus Torvalds 已提交
1179 1180 1181

	buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
	if (!buf) {
1182
		dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n");
L
Linus Torvalds 已提交
1183 1184 1185 1186
		goto alloc_fail2;
	}
	acm->ctrl_buffer = buf;

1187
	if (acm_write_buffers_alloc(acm) < 0) {
1188
		dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n");
L
Linus Torvalds 已提交
1189 1190 1191 1192 1193
		goto alloc_fail4;
	}

	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!acm->ctrlurb) {
1194
		dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
L
Linus Torvalds 已提交
1195 1196
		goto alloc_fail5;
	}
1197
	for (i = 0; i < num_rx_buf; i++) {
1198 1199
		struct acm_ru *rcv = &(acm->ru[i]);

1200 1201 1202 1203
		rcv->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (rcv->urb == NULL) {
			dev_dbg(&intf->dev,
				"out of memory (read urbs usb_alloc_urb)\n");
1204 1205 1206 1207 1208 1209
			goto alloc_fail7;
		}

		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		rcv->instance = acm;
	}
1210
	for (i = 0; i < num_rx_buf; i++) {
D
David Brownell 已提交
1211
		struct acm_rb *rb = &(acm->rb[i]);
1212

D
David Brownell 已提交
1213 1214 1215
		rb->base = usb_buffer_alloc(acm->dev, readsize,
				GFP_KERNEL, &rb->dma);
		if (!rb->base) {
1216 1217
			dev_dbg(&intf->dev,
				"out of memory (read bufs usb_buffer_alloc)\n");
1218 1219
			goto alloc_fail7;
		}
L
Linus Torvalds 已提交
1220
	}
1221
	for (i = 0; i < ACM_NW; i++) {
1222 1223
		struct acm_wb *snd = &(acm->wb[i]);

1224 1225 1226 1227
		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (snd->urb == NULL) {
			dev_dbg(&intf->dev,
				"out of memory (write urbs usb_alloc_urb)");
1228 1229 1230
			goto alloc_fail7;
		}

1231 1232 1233 1234 1235 1236 1237 1238
		if (usb_endpoint_xfer_int(epwrite))
			usb_fill_int_urb(snd->urb, usb_dev,
				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
		else
			usb_fill_bulk_urb(snd->urb, usb_dev,
				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
				NULL, acm->writesize, acm_write_bulk, snd);
1239 1240
		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		snd->instance = acm;
L
Linus Torvalds 已提交
1241 1242
	}

1243
	usb_set_intfdata(intf, acm);
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253

	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;
1254 1255
		memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
							cfd->bLength - 4);
1256 1257 1258 1259 1260 1261 1262 1263
		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;
		}

1264 1265
		i = device_create_file(&intf->dev,
						&dev_attr_iCountryCodeRelDate);
1266 1267 1268 1269 1270 1271 1272
		if (i < 0) {
			kfree(acm->country_codes);
			goto skip_countries;
		}
	}

skip_countries:
1273
	usb_fill_int_urb(acm->ctrlurb, usb_dev,
1274 1275 1276 1277
			 usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
			 acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
			 /* works around buggy devices */
			 epctrl->bInterval ? epctrl->bInterval : 0xff);
L
Linus Torvalds 已提交
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
	acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	acm->ctrlurb->transfer_dma = acm->ctrl_dma;

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

	acm_set_control(acm, acm->ctrlout);

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

	usb_driver_claim_interface(&acm_driver, data_interface, acm);
D
David Brownell 已提交
1290
	usb_set_intfdata(data_interface, acm);
L
Linus Torvalds 已提交
1291

1292 1293
	usb_get_intf(control_interface);
	tty_register_device(acm_tty_driver, minor, &control_interface->dev);
L
Linus Torvalds 已提交
1294 1295 1296

	acm_table[minor] = acm;

1297 1298
	return 0;
alloc_fail8:
1299 1300
	for (i = 0; i < ACM_NW; i++)
		usb_free_urb(acm->wb[i].urb);
L
Linus Torvalds 已提交
1301
alloc_fail7:
1302
	acm_read_buffers_free(acm);
1303
	for (i = 0; i < num_rx_buf; i++)
1304
		usb_free_urb(acm->ru[i].urb);
L
Linus Torvalds 已提交
1305 1306
	usb_free_urb(acm->ctrlurb);
alloc_fail5:
1307
	acm_write_buffers_free(acm);
L
Linus Torvalds 已提交
1308 1309 1310 1311 1312 1313 1314 1315
alloc_fail4:
	usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
alloc_fail2:
	kfree(acm);
alloc_fail:
	return -ENOMEM;
}

O
Oliver Neukum 已提交
1316 1317 1318
static void stop_data_traffic(struct acm *acm)
{
	int i;
1319
	dbg("Entering stop_data_traffic");
O
Oliver Neukum 已提交
1320 1321 1322 1323

	tasklet_disable(&acm->urb_task);

	usb_kill_urb(acm->ctrlurb);
1324
	for (i = 0; i < ACM_NW; i++)
1325
		usb_kill_urb(acm->wb[i].urb);
O
Oliver Neukum 已提交
1326 1327 1328 1329 1330 1331 1332 1333
	for (i = 0; i < acm->rx_buflimit; i++)
		usb_kill_urb(acm->ru[i].urb);

	tasklet_enable(&acm->urb_task);

	cancel_work_sync(&acm->work);
}

L
Linus Torvalds 已提交
1334 1335
static void acm_disconnect(struct usb_interface *intf)
{
1336
	struct acm *acm = usb_get_intfdata(intf);
L
Linus Torvalds 已提交
1337
	struct usb_device *usb_dev = interface_to_usbdev(intf);
A
Alan Cox 已提交
1338
	struct tty_struct *tty;
L
Linus Torvalds 已提交
1339

D
David Brownell 已提交
1340 1341
	/* sibling interface is already cleaning up */
	if (!acm)
1342
		return;
D
David Brownell 已提交
1343 1344

	mutex_lock(&open_mutex);
1345
	if (acm->country_codes) {
1346 1347 1348 1349
		device_remove_file(&acm->control->dev,
				&dev_attr_wCountryCodes);
		device_remove_file(&acm->control->dev,
				&dev_attr_iCountryCodeRelDate);
1350
	}
1351
	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
L
Linus Torvalds 已提交
1352
	acm->dev = NULL;
1353 1354
	usb_set_intfdata(acm->control, NULL);
	usb_set_intfdata(acm->data, NULL);
L
Linus Torvalds 已提交
1355

O
Oliver Neukum 已提交
1356
	stop_data_traffic(acm);
L
Linus Torvalds 已提交
1357

1358
	acm_write_buffers_free(acm);
1359 1360
	usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer,
								acm->ctrl_dma);
1361
	acm_read_buffers_free(acm);
L
Linus Torvalds 已提交
1362

1363 1364
	if (!acm->combined_interfaces)
		usb_driver_release_interface(&acm_driver, intf == acm->control ?
1365
					acm->data : acm->control);
L
Linus Torvalds 已提交
1366

A
Alan Cox 已提交
1367
	if (acm->port.count == 0) {
1368
		acm_tty_unregister(acm);
1369
		mutex_unlock(&open_mutex);
L
Linus Torvalds 已提交
1370 1371 1372
		return;
	}

1373
	mutex_unlock(&open_mutex);
A
Alan Cox 已提交
1374 1375 1376 1377 1378
	tty = tty_port_tty_get(&acm->port);
	if (tty) {
		tty_hangup(tty);
		tty_kref_put(tty);
	}
L
Linus Torvalds 已提交
1379 1380
}

1381
#ifdef CONFIG_PM
O
Oliver Neukum 已提交
1382 1383 1384
static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct acm *acm = usb_get_intfdata(intf);
1385 1386
	int cnt;

A
Alan Stern 已提交
1387
	if (message.event & PM_EVENT_AUTO) {
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
		int b;

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

	spin_lock_irq(&acm->read_lock);
	spin_lock(&acm->write_lock);
	cnt = acm->susp_count++;
	spin_unlock(&acm->write_lock);
	spin_unlock_irq(&acm->read_lock);
O
Oliver Neukum 已提交
1404

1405
	if (cnt)
O
Oliver Neukum 已提交
1406 1407 1408 1409 1410 1411 1412
		return 0;
	/*
	we treat opened interfaces differently,
	we must guard against open
	*/
	mutex_lock(&acm->mutex);

A
Alan Cox 已提交
1413
	if (acm->port.count)
O
Oliver Neukum 已提交
1414 1415 1416 1417 1418 1419 1420 1421 1422
		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);
1423
	struct acm_wb *wb;
O
Oliver Neukum 已提交
1424
	int rv = 0;
1425
	int cnt;
O
Oliver Neukum 已提交
1426

1427 1428 1429 1430 1431 1432
	spin_lock_irq(&acm->read_lock);
	acm->susp_count -= 1;
	cnt = acm->susp_count;
	spin_unlock_irq(&acm->read_lock);

	if (cnt)
O
Oliver Neukum 已提交
1433 1434 1435
		return 0;

	mutex_lock(&acm->mutex);
A
Alan Cox 已提交
1436
	if (acm->port.count) {
O
Oliver Neukum 已提交
1437
		rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452

		spin_lock_irq(&acm->write_lock);
		if (acm->delayed_wb) {
			wb = acm->delayed_wb;
			acm->delayed_wb = NULL;
			spin_unlock_irq(&acm->write_lock);
			acm_start_wb(acm, acm->delayed_wb);
		} else {
			spin_unlock_irq(&acm->write_lock);
		}

		/*
		 * delayed error checking because we must
		 * do the write path at all cost
		 */
O
Oliver Neukum 已提交
1453
		if (rv < 0)
1454
			goto err_out;
O
Oliver Neukum 已提交
1455 1456 1457 1458 1459 1460 1461 1462

		tasklet_schedule(&acm->urb_task);
	}

err_out:
	mutex_unlock(&acm->mutex);
	return rv;
}
1463

1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
static int acm_reset_resume(struct usb_interface *intf)
{
	struct acm *acm = usb_get_intfdata(intf);
	struct tty_struct *tty;

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

1481
#endif /* CONFIG_PM */
1482 1483 1484 1485 1486 1487

#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)

L
Linus Torvalds 已提交
1488 1489 1490 1491 1492 1493 1494 1495 1496
/*
 * 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 */
	},
1497 1498 1499
	{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
A
Andrew Lunn 已提交
1500 1501 1502
	{ USB_DEVICE(0x0e8d, 0x3329), /* MediaTek Inc GPS */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1503 1504 1505
	{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1506 1507 1508
	{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
A
Alan Cox 已提交
1509 1510 1511
	{ USB_DEVICE(0x0ace, 0x1602), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB,
	},
1512 1513 1514
	{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
1515 1516 1517
	{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
	.driver_info = SINGLE_RX_URB, /* firmware bug */
	},
O
Oliver Neukum 已提交
1518 1519 1520
	{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1521 1522 1523
	{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1524 1525 1526
	{ USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1527 1528 1529
	{ USB_DEVICE(0x0572, 0x1324), /* Conexant USB MODEM RD02-D400 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1530 1531 1532
	{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
	},
1533 1534
	{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
	},
1535 1536 1537 1538 1539 1540 1541
	{ 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. */
	},
1542 1543 1544
	{ USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
	.driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
	},
O
Oliver Neukum 已提交
1545

1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596
	/* 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 */

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

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

	{ }
};

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

/*
 * TTY driver structures.
 */

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static const struct tty_operations acm_ops = {
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	.open =			acm_tty_open,
	.close =		acm_tty_close,
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	.hangup =		acm_tty_hangup,
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	.write =		acm_tty_write,
	.write_room =		acm_tty_write_room,
	.ioctl =		acm_tty_ioctl,
	.throttle =		acm_tty_throttle,
	.unthrottle =		acm_tty_unthrottle,
	.chars_in_buffer =	acm_tty_chars_in_buffer,
	.break_ctl =		acm_tty_break_ctl,
	.set_termios =		acm_tty_set_termios,
	.tiocmget =		acm_tty_tiocmget,
	.tiocmset =		acm_tty_tiocmset,
};

/*
 * Init / exit.
 */

static int __init acm_init(void)
{
	int retval;
	acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
	if (!acm_tty_driver)
		return -ENOMEM;
	acm_tty_driver->owner = THIS_MODULE,
	acm_tty_driver->driver_name = "acm",
	acm_tty_driver->name = "ttyACM",
	acm_tty_driver->major = ACM_TTY_MAJOR,
	acm_tty_driver->minor_start = 0,
	acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
	acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
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	acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
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	acm_tty_driver->init_termios = tty_std_termios;
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	acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD |
								HUPCL | CLOCAL;
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	tty_set_operations(acm_tty_driver, &acm_ops);

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

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

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	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_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);

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