forked from torvalds/linux
/
cdc-acm.c
1817 lines (1563 loc) · 48.4 KB
/
cdc-acm.c
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/*
* 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/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/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 struct acm *acm_table[ACM_TTY_MINORS];
static DEFINE_MUTEX(acm_table_lock);
/*
* acm_table accessors
*/
/*
* Look up an ACM structure by index. If found and not disconnected, increment
* its refcount and return it with its mutex held.
*/
static struct acm *acm_get_by_index(unsigned index)
{
struct acm *acm;
mutex_lock(&acm_table_lock);
acm = acm_table[index];
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_table_lock);
return acm;
}
/*
* 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_table_lock);
for (minor = 0; minor < ACM_TTY_MINORS; minor++) {
if (!acm_table[minor]) {
acm_table[minor] = acm;
break;
}
}
mutex_unlock(&acm_table_lock);
return minor;
}
/* Release the minor number associated with 'acm'. */
static void acm_release_minor(struct acm *acm)
{
mutex_lock(&acm_table_lock);
acm_table[acm->minor] = NULL;
mutex_unlock(&acm_table_lock);
}
/*
* Functions for ACM control messages.
*/
static int acm_ctrl_msg(struct acm *acm, int request, int value,
void *buf, int len)
{
int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
request, USB_RT_ACM, value,
acm->control->altsetting[0].desc.bInterfaceNumber,
buf, len, 5000);
dev_dbg(&acm->control->dev,
"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
__func__, request, value, len, retval);
return retval < 0 ? retval : 0;
}
/* devices aren't required to support these requests.
* the cdc acm descriptor tells whether they do...
*/
#define acm_set_control(acm, control) \
acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
#define acm_set_line(acm, line) \
acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
#define acm_send_break(acm, ms) \
acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
/*
* 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;
}
}
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;
}
/*
* 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);
}
/*
* 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;
}
static int acm_write_start(struct acm *acm, int wbn)
{
unsigned long flags;
struct acm_wb *wb = &acm->wb[wbn];
int rc;
spin_lock_irqsave(&acm->write_lock, flags);
if (!acm->dev) {
wb->use = 0;
spin_unlock_irqrestore(&acm->write_lock, flags);
return -ENODEV;
}
dev_vdbg(&acm->data->dev, "%s - susp_count %d\n", __func__,
acm->susp_count);
usb_autopm_get_interface_async(acm->control);
if (acm->susp_count) {
if (!acm->delayed_wb)
acm->delayed_wb = wb;
else
usb_autopm_put_interface_async(acm->control);
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
usb_mark_last_busy(acm->dev);
rc = acm_start_wb(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
return rc;
}
/*
* 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);
}
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;
struct tty_struct *tty;
unsigned char *data;
int newctrl;
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:
tty = tty_port_tty_get(&acm->port);
newctrl = get_unaligned_le16(data);
if (tty) {
if (!acm->clocal &&
(acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
dev_dbg(&acm->control->dev,
"%s - calling hangup\n", __func__);
tty_hangup(tty);
}
tty_kref_put(tty);
}
acm->ctrlin = newctrl;
dev_dbg(&acm->control->dev,
"%s - input control lines: dcd%c dsr%c break%c "
"ring%c framing%c parity%c overrun%c\n",
__func__,
acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
break;
default:
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)
dev_err(&acm->control->dev, "%s - usb_submit_urb failed: %d\n",
__func__, retval);
}
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;
dev_vdbg(&acm->data->dev, "%s - urb %d\n", __func__, index);
res = usb_submit_urb(acm->read_urbs[index], mem_flags);
if (res) {
if (res != -EPERM) {
dev_err(&acm->data->dev,
"%s - usb_submit_urb failed: %d\n",
__func__, res);
}
set_bit(index, &acm->read_urbs_free);
return res;
}
return 0;
}
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;
}
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);
}
static void acm_read_bulk_callback(struct urb *urb)
{
struct acm_rb *rb = urb->context;
struct acm *acm = rb->instance;
unsigned long flags;
dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
rb->index, urb->actual_length);
set_bit(rb->index, &acm->read_urbs_free);
if (!acm->dev) {
dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
return;
}
usb_mark_last_busy(acm->dev);
if (urb->status) {
dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
__func__, urb->status);
return;
}
acm_process_read_urb(acm, urb);
/* throttle device if requested by tty */
spin_lock_irqsave(&acm->read_lock, flags);
acm->throttled = acm->throttle_req;
if (!acm->throttled && !acm->susp_count) {
spin_unlock_irqrestore(&acm->read_lock, flags);
acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
} else {
spin_unlock_irqrestore(&acm->read_lock, flags);
}
}
/* 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;
if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
dev_vdbg(&acm->data->dev, "%s - len %d/%d, status %d\n",
__func__,
urb->actual_length,
urb->transfer_buffer_length,
urb->status);
spin_lock_irqsave(&acm->write_lock, flags);
acm_write_done(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
schedule_work(&acm->work);
}
static void acm_softint(struct work_struct *work)
{
struct acm *acm = container_of(work, struct acm, work);
struct tty_struct *tty;
dev_vdbg(&acm->data->dev, "%s\n", __func__);
tty = tty_port_tty_get(&acm->port);
if (!tty)
return;
tty_wakeup(tty);
tty_kref_put(tty);
}
/*
* TTY handlers
*/
static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
struct acm *acm;
int retval;
dev_dbg(tty->dev, "%s\n", __func__);
acm = acm_get_by_index(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;
}
static int acm_tty_open(struct tty_struct *tty, struct file *filp)
{
struct acm *acm = tty->driver_data;
dev_dbg(tty->dev, "%s\n", __func__);
return tty_port_open(&acm->port, tty, filp);
}
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;
dev_dbg(&acm->control->dev, "%s\n", __func__);
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;
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dev_err(&acm->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
goto error_submit_urb;
}
acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
if (acm_set_control(acm, acm->ctrlout) < 0 &&
(acm->ctrl_caps & USB_CDC_CAP_LINE))
goto error_set_control;
usb_autopm_put_interface(acm->control);
/*
* 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);
if (acm_submit_read_urbs(acm, GFP_KERNEL))
goto error_submit_read_urbs;
mutex_unlock(&acm->mutex);
return 0;
error_submit_read_urbs:
acm->ctrlout = 0;
acm_set_control(acm, acm->ctrlout);
error_set_control:
usb_kill_urb(acm->ctrlurb);
error_submit_urb:
usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
mutex_unlock(&acm->mutex);
return retval;
}
static void acm_port_destruct(struct tty_port *port)
{
struct acm *acm = container_of(port, struct acm, port);
dev_dbg(&acm->control->dev, "%s\n", __func__);
acm_release_minor(acm);
usb_put_intf(acm->control);
kfree(acm->country_codes);
kfree(acm);
}
static void acm_port_shutdown(struct tty_port *port)
{
struct acm *acm = container_of(port, struct acm, port);
int i;
dev_dbg(&acm->control->dev, "%s\n", __func__);
mutex_lock(&acm->mutex);
if (!acm->disconnected) {
usb_autopm_get_interface(acm->control);
acm_set_control(acm, acm->ctrlout = 0);
usb_kill_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++)
usb_kill_urb(acm->wb[i].urb);
for (i = 0; i < acm->rx_buflimit; i++)
usb_kill_urb(acm->read_urbs[i]);
acm->control->needs_remote_wakeup = 0;
usb_autopm_put_interface(acm->control);
}
mutex_unlock(&acm->mutex);
}
static void acm_tty_cleanup(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
dev_dbg(&acm->control->dev, "%s\n", __func__);
tty_port_put(&acm->port);
}
static void acm_tty_hangup(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
dev_dbg(&acm->control->dev, "%s\n", __func__);
tty_port_hangup(&acm->port);
}
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
struct acm *acm = tty->driver_data;
dev_dbg(&acm->control->dev, "%s\n", __func__);
tty_port_close(&acm->port, tty, filp);
}
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, "%s - count %d\n", __func__, 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];
count = (count > acm->writesize) ? acm->writesize : count;
dev_vdbg(&acm->data->dev, "%s - write %d\n", __func__, count);
memcpy(wb->buf, buf, count);
wb->len = count;
spin_unlock_irqrestore(&acm->write_lock, flags);
stat = acm_write_start(acm, wbn);
if (stat < 0)
return stat;
return count;
}
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;
}
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;
}
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);
}
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);
}
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;
}
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;
}
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);
}
static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
{
struct serial_struct tmp;
if (!info)
return -EINVAL;
memset(&tmp, 0, sizeof(tmp));
tmp.flags = ASYNC_LOW_LATENCY;
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;
}
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;
}
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;
}
return rv;
}
static const __u32 acm_tty_speed[] = {
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
};
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 (!newline.dwDTERate) {
newline.dwDTERate = acm->line.dwDTERate;
newctrl &= ~ACM_CTRL_DTR;
} else
newctrl |= ACM_CTRL_DTR;
if (newctrl != acm->ctrlout)
acm_set_control(acm, acm->ctrlout = newctrl);
if (memcmp(&acm->line, &newline, sizeof newline)) {
memcpy(&acm->line, &newline, sizeof newline);
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);
}
}
static const struct tty_port_operations acm_port_ops = {
.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;
struct usb_device *usb_dev = interface_to_usbdev(acm->control);
for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++)
usb_free_coherent(usb_dev, acm->writesize, wb->buf, wb->dmah);
}
static void acm_read_buffers_free(struct acm *acm)
{
struct usb_device *usb_dev = interface_to_usbdev(acm->control);
int i;
for (i = 0; i < acm->rx_buflimit; i++)
usb_free_coherent(usb_dev, acm->readsize,
acm->read_buffers[i].base, acm->read_buffers[i].dma);
}
/* 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;
}
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_country_functional_desc *cfd = 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 acm *acm;
int minor;
int ctrlsize, readsize;
u8 *buf;
u8 ac_management_function = 0;
u8 call_management_function = 0;
int call_interface_num = -1;
int data_interface_num = -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;
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);
goto skip_normal_probe;
}
/* normal probing*/
if (!buffer) {
dev_err(&intf->dev, "Weird descriptor references\n");
return -EINVAL;
}
if (!buflen) {
if (intf->cur_altsetting->endpoint &&