linux/drivers/usb/class/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/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;
}
/*
* 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;
}
/* 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);
}
/*
* 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;
}
/* 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);
}
#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;
}
/*
USB: cdc-acm.c: fix recursive lock in acm_start_wb error path Fixes an obvious bug in cdc-acm by avoiding a recursive lock on acm_start_wb()'s error path. Should apply towards 2.6.27 stable and 2.6.28. ============================================= [ INFO: possible recursive locking detected ] 2.6.27-2-pae #109 --------------------------------------------- python/31449 is trying to acquire lock: (&acm->write_lock){++..}, at: [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] but task is already holding lock: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] other info that might help us debug this: 2 locks held by python/31449: #0: (&tty->atomic_write_lock){--..}, at: [<c0260fae>] tty_write_lock+0x14/0x3b #1: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] stack backtrace: Pid: 31449, comm: python Not tainted 2.6.27-2-pae #109 [<c030f42f>] ? printk+0xf/0x18 [<c0149f33>] __lock_acquire+0xc7b/0x1316 [<c014a63e>] lock_acquire+0x70/0x97 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<c0312109>] _spin_lock_irqsave+0x37/0x47 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a055d>] acm_tty_write+0x143/0x167 [cdc_acm] [<c0262a98>] write_chan+0x1cd/0x297 [<c012527e>] ? default_wake_function+0x0/0xd [<c026111e>] tty_write+0x149/0x1b9 [<c02628cb>] ? write_chan+0x0/0x297 [<c01912c5>] ? rw_verify_area+0x76/0x98 [<c0260fd5>] ? tty_write+0x0/0x1b9 [<c01919ba>] vfs_write+0x8c/0x136 [<c0191afd>] sys_write+0x3b/0x60 [<c0103beb>] sysenter_do_call+0x12/0x3f ======================= Signed-off-by: Brandon Philips <bphilips@suse.de> Cc: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-11-06 19:19:11 +00:00
* 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);
}
/*
* 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;
}
/*
* 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 */
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
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);
}
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;
int status = urb->status;
dev_vdbg(&acm->data->dev, "%s - urb %d, len %d\n", __func__,
rb->index, urb->actual_length);
if (!acm->dev) {
set_bit(rb->index, &acm->read_urbs_free);
dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
return;
}
if (status) {
set_bit(rb->index, &acm->read_urbs_free);
dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
__func__, status);
if ((status != -ENOENT) || (urb->actual_length == 0))
return;
}
usb_mark_last_busy(acm->dev);
acm_process_read_urb(acm, urb);
/*
* Unthrottle may run on another CPU which needs to see events
* in the same order. Submission has an implict barrier
*/
smp_mb__before_atomic();
set_bit(rb->index, &acm->read_urbs_free);
/* 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);
}
}
/* data interface wrote those outgoing bytes */
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
static void acm_write_bulk(struct urb *urb)
{
struct acm_wb *wb = urb->context;
struct acm *acm = wb->instance;
USB: cdc-acm.c: fix recursive lock in acm_start_wb error path Fixes an obvious bug in cdc-acm by avoiding a recursive lock on acm_start_wb()'s error path. Should apply towards 2.6.27 stable and 2.6.28. ============================================= [ INFO: possible recursive locking detected ] 2.6.27-2-pae #109 --------------------------------------------- python/31449 is trying to acquire lock: (&acm->write_lock){++..}, at: [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] but task is already holding lock: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] other info that might help us debug this: 2 locks held by python/31449: #0: (&tty->atomic_write_lock){--..}, at: [<c0260fae>] tty_write_lock+0x14/0x3b #1: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] stack backtrace: Pid: 31449, comm: python Not tainted 2.6.27-2-pae #109 [<c030f42f>] ? printk+0xf/0x18 [<c0149f33>] __lock_acquire+0xc7b/0x1316 [<c014a63e>] lock_acquire+0x70/0x97 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<c0312109>] _spin_lock_irqsave+0x37/0x47 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a055d>] acm_tty_write+0x143/0x167 [cdc_acm] [<c0262a98>] write_chan+0x1cd/0x297 [<c012527e>] ? default_wake_function+0x0/0xd [<c026111e>] tty_write+0x149/0x1b9 [<c02628cb>] ? write_chan+0x0/0x297 [<c01912c5>] ? rw_verify_area+0x76/0x98 [<c0260fd5>] ? tty_write+0x0/0x1b9 [<c01919ba>] vfs_write+0x8c/0x136 [<c0191afd>] sys_write+0x3b/0x60 [<c0103beb>] sysenter_do_call+0x12/0x3f ======================= Signed-off-by: Brandon Philips <bphilips@suse.de> Cc: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-11-06 19:19:11 +00:00
unsigned long flags;
int status = urb->status;
if (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,
status);
USB: cdc-acm.c: fix recursive lock in acm_start_wb error path Fixes an obvious bug in cdc-acm by avoiding a recursive lock on acm_start_wb()'s error path. Should apply towards 2.6.27 stable and 2.6.28. ============================================= [ INFO: possible recursive locking detected ] 2.6.27-2-pae #109 --------------------------------------------- python/31449 is trying to acquire lock: (&acm->write_lock){++..}, at: [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] but task is already holding lock: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] other info that might help us debug this: 2 locks held by python/31449: #0: (&tty->atomic_write_lock){--..}, at: [<c0260fae>] tty_write_lock+0x14/0x3b #1: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] stack backtrace: Pid: 31449, comm: python Not tainted 2.6.27-2-pae #109 [<c030f42f>] ? printk+0xf/0x18 [<c0149f33>] __lock_acquire+0xc7b/0x1316 [<c014a63e>] lock_acquire+0x70/0x97 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<c0312109>] _spin_lock_irqsave+0x37/0x47 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a055d>] acm_tty_write+0x143/0x167 [cdc_acm] [<c0262a98>] write_chan+0x1cd/0x297 [<c012527e>] ? default_wake_function+0x0/0xd [<c026111e>] tty_write+0x149/0x1b9 [<c02628cb>] ? write_chan+0x0/0x297 [<c01912c5>] ? rw_verify_area+0x76/0x98 [<c0260fd5>] ? tty_write+0x0/0x1b9 [<c01919ba>] vfs_write+0x8c/0x136 [<c0191afd>] sys_write+0x3b/0x60 [<c0103beb>] sysenter_do_call+0x12/0x3f ======================= Signed-off-by: Brandon Philips <bphilips@suse.de> Cc: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-11-06 19:19:11 +00:00
spin_lock_irqsave(&acm->write_lock, flags);
acm_write_done(acm, wb);
USB: cdc-acm.c: fix recursive lock in acm_start_wb error path Fixes an obvious bug in cdc-acm by avoiding a recursive lock on acm_start_wb()'s error path. Should apply towards 2.6.27 stable and 2.6.28. ============================================= [ INFO: possible recursive locking detected ] 2.6.27-2-pae #109 --------------------------------------------- python/31449 is trying to acquire lock: (&acm->write_lock){++..}, at: [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] but task is already holding lock: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] other info that might help us debug this: 2 locks held by python/31449: #0: (&tty->atomic_write_lock){--..}, at: [<c0260fae>] tty_write_lock+0x14/0x3b #1: (&acm->write_lock){++..}, at: [<f89a04fb>] acm_tty_write+0xe1/0x167 [cdc_acm] stack backtrace: Pid: 31449, comm: python Not tainted 2.6.27-2-pae #109 [<c030f42f>] ? printk+0xf/0x18 [<c0149f33>] __lock_acquire+0xc7b/0x1316 [<c014a63e>] lock_acquire+0x70/0x97 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<c0312109>] _spin_lock_irqsave+0x37/0x47 [<f89a0348>] ? acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a0348>] acm_start_wb+0x5c/0x7b [cdc_acm] [<f89a055d>] acm_tty_write+0x143/0x167 [cdc_acm] [<c0262a98>] write_chan+0x1cd/0x297 [<c012527e>] ? default_wake_function+0x0/0xd [<c026111e>] tty_write+0x149/0x1b9 [<c02628cb>] ? write_chan+0x0/0x297 [<c01912c5>] ? rw_verify_area+0x76/0x98 [<c0260fd5>] ? tty_write+0x0/0x1b9 [<c01919ba>] vfs_write+0x8c/0x136 [<c0191afd>] sys_write+0x3b/0x60 [<c0103beb>] sysenter_do_call+0x12/0x3f ======================= Signed-off-by: Brandon Philips <bphilips@suse.de> Cc: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-11-06 19:19:11 +00:00
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);
dev_vdbg(&acm->data->dev, "%s\n", __func__);
tty_port_tty_wakeup(&acm->port);
}
/*
* 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_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;
}
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 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");
}
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;
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;
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);
}
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);
struct urb *urb;
struct acm_wb *wb;
int i;
dev_dbg(&acm->control->dev, "%s\n", __func__);
/*
* 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);
}
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]);
}
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];
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, "%s - write %d\n", __func__, 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) {
usb_anchor_urb(wb->urb, &acm->delayed);
spin_unlock_irqrestore(&acm->write_lock, flags);
return count;
}
stat = acm_start_wb(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
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 wait_serial_change(struct acm *acm, unsigned long arg)
{
int rv = 0;
DECLARE_WAITQUEUE(wait, current);
struct async_icount old, new;
if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
return -EINVAL;
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;
}
static int get_serial_usage(struct acm *acm,
struct serial_icounter_struct __user *count)
{
struct serial_icounter_struct icount;
int rv = 0;
memset(&icount, 0, sizeof(icount));
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;
if (copy_to_user(count, &icount, sizeof(icount)) > 0)
rv = -EFAULT;
return rv;
}
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;
case TIOCGICOUNT:
rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
break;
}
return rv;
}
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);
}
}
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;
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;
unsigned int elength = 0;
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;
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 &&
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;
}
}
while (buflen > 0) {
elength = buffer[0];
if (!elength) {
dev_err(&intf->dev, "skipping garbage byte\n");
elength = 1;
goto next_desc;
}
if (buffer[1] != USB_DT_CS_INTERFACE) {
dev_err(&intf->dev, "skipping garbage\n");
goto next_desc;
}
switch (buffer[2]) {
case USB_CDC_UNION_TYPE: /* we've found it */
if (elength < sizeof(struct usb_cdc_union_desc))
goto next_desc;
if (union_header) {
dev_err(&intf->dev, "More than one "
"union descriptor, skipping ...\n");
goto next_desc;
}
union_header = (struct usb_cdc_union_desc *)buffer;
break;
case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
if (elength < sizeof(struct usb_cdc_country_functional_desc))
goto next_desc;
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:
if (elength < 4)
goto next_desc;
ac_management_function = buffer[3];
break;
case USB_CDC_CALL_MANAGEMENT_TYPE:
if (elength < 5)
goto next_desc;
call_management_function = buffer[3];
call_interface_num = buffer[4];
break;
default:
/*
* there are LOTS more CDC descriptors that
* could legitimately be found here.
*/
dev_dbg(&intf->dev, "Ignoring descriptor: "
"type %02x, length %ud\n",
buffer[2], elength);
break;
}
next_desc:
buflen -= elength;
buffer += elength;
}
if (!union_header) {
if (call_interface_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_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_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 {
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) {
dev_dbg(&intf->dev, "no interfaces\n");
return -ENODEV;
}
if (data_interface_num != call_interface_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) {
dev_err(&intf->dev, "no more free acm devices\n");
kfree(acm);
return -ENODEV;
}
USB: use usb_endpoint_maxp() instead of le16_to_cpu() Now ${LINUX}/drivers/usb/* can use usb_endpoint_maxp(desc) to get maximum packet size instead of le16_to_cpu(desc->wMaxPacketSize). This patch fix it up Cc: Armin Fuerst <fuerst@in.tum.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Johannes Erdfelt <johannes@erdfelt.com> Cc: Vojtech Pavlik <vojtech@suse.cz> Cc: Oliver Neukum <oliver@neukum.name> Cc: David Kubicek <dave@awk.cz> Cc: Johan Hovold <jhovold@gmail.com> Cc: Brad Hards <bhards@bigpond.net.au> Acked-by: Felipe Balbi <balbi@ti.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de> Cc: David Brownell <david-b@pacbell.net> Cc: David Lopo <dlopo@chipidea.mips.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Xie Xiaobo <X.Xie@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Jiang Bo <tanya.jiang@freescale.com> Cc: Yuan-hsin Chen <yhchen@faraday-tech.com> Cc: Darius Augulis <augulis.darius@gmail.com> Cc: Xiaochen Shen <xiaochen.shen@intel.com> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Cc: OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Cc: Ben Dooks <ben@simtec.co.uk> Cc: Thomas Abraham <thomas.ab@samsung.com> Cc: Herbert Pötzl <herbert@13thfloor.at> Cc: Arnaud Patard <arnaud.patard@rtp-net.org> Cc: Roman Weissgaerber <weissg@vienna.at> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Tony Olech <tony.olech@elandigitalsystems.com> Cc: Florian Floe Echtler <echtler@fs.tum.de> Cc: Christian Lucht <lucht@codemercs.com> Cc: Juergen Stuber <starblue@sourceforge.net> Cc: Georges Toth <g.toth@e-biz.lu> Cc: Bill Ryder <bryder@sgi.com> Cc: Kuba Ober <kuba@mareimbrium.org> Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 10:12:03 +00:00
ctrlsize = usb_endpoint_maxp(epctrl);
readsize = usb_endpoint_maxp(epread) *
(quirks == SINGLE_RX_URB ? 1 : 2);
acm->combined_interfaces = combined_interfaces;
USB: use usb_endpoint_maxp() instead of le16_to_cpu() Now ${LINUX}/drivers/usb/* can use usb_endpoint_maxp(desc) to get maximum packet size instead of le16_to_cpu(desc->wMaxPacketSize). This patch fix it up Cc: Armin Fuerst <fuerst@in.tum.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Johannes Erdfelt <johannes@erdfelt.com> Cc: Vojtech Pavlik <vojtech@suse.cz> Cc: Oliver Neukum <oliver@neukum.name> Cc: David Kubicek <dave@awk.cz> Cc: Johan Hovold <jhovold@gmail.com> Cc: Brad Hards <bhards@bigpond.net.au> Acked-by: Felipe Balbi <balbi@ti.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Dahlmann <dahlmann.thomas@arcor.de> Cc: David Brownell <david-b@pacbell.net> Cc: David Lopo <dlopo@chipidea.mips.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Xie Xiaobo <X.Xie@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Jiang Bo <tanya.jiang@freescale.com> Cc: Yuan-hsin Chen <yhchen@faraday-tech.com> Cc: Darius Augulis <augulis.darius@gmail.com> Cc: Xiaochen Shen <xiaochen.shen@intel.com> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Cc: OKI SEMICONDUCTOR, <toshiharu-linux@dsn.okisemi.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Cc: Ben Dooks <ben@simtec.co.uk> Cc: Thomas Abraham <thomas.ab@samsung.com> Cc: Herbert Pötzl <herbert@13thfloor.at> Cc: Arnaud Patard <arnaud.patard@rtp-net.org> Cc: Roman Weissgaerber <weissg@vienna.at> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Tony Olech <tony.olech@elandigitalsystems.com> Cc: Florian Floe Echtler <echtler@fs.tum.de> Cc: Christian Lucht <lucht@codemercs.com> Cc: Juergen Stuber <starblue@sourceforge.net> Cc: Georges Toth <g.toth@e-biz.lu> Cc: Bill Ryder <bryder@sgi.com> Cc: Kuba Ober <kuba@mareimbrium.org> Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-23 10:12:03 +00:00
acm->writesize = usb_endpoint_maxp(epwrite) * 20;
acm->control = control_interface;
acm->data = data_interface;
acm->minor = minor;
acm->dev = usb_dev;
acm->ctrl_caps = ac_management_function;
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);
acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
acm->is_int_ep = usb_endpoint_xfer_int(epread);
if (acm->is_int_ep)
acm->bInterval = epread->bInterval;
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 (acm->is_int_ep) {
usb_fill_int_urb(urb, acm->dev,
acm->rx_endpoint,
rb->base,
acm->readsize,
acm_read_bulk_callback, rb,
acm->bInterval);
} else {
usb_fill_bulk_urb(urb, acm->dev,
acm->rx_endpoint,
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,
usb_sndintpipe(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);
snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
snd->instance = acm;
}
usb_set_intfdata(intf, acm);
i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
if (i < 0)
goto alloc_fail7;
if (cfd) { /* export the country data */
acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
if (!acm->country_codes)
goto skip_countries;
acm->country_code_size = cfd->bLength - 4;
memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0,
cfd->bLength - 4);
acm->country_rel_date = cfd->iCountryCodeRelDate;
i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
if (i < 0) {
kfree(acm->country_codes);
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, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
}
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);
kfree(acm);
alloc_fail:
return rv;
}
static void stop_data_traffic(struct acm *acm)
{
int i;
dev_dbg(&acm->control->dev, "%s\n", __func__);
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]);
cancel_work_sync(&acm->work);
}
static void acm_disconnect(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
struct usb_device *usb_dev = interface_to_usbdev(intf);
struct tty_struct *tty;
int i;
dev_dbg(&intf->dev, "%s\n", __func__);
/* 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);
}
stop_data_traffic(acm);
tty_unregister_device(acm_tty_driver, acm->minor);
usb_free_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++)
usb_free_urb(acm->wb[i].urb);
for (i = 0; i < acm->rx_buflimit; i++)
usb_free_urb(acm->read_urbs[i]);
acm_write_buffers_free(acm);
usb_free_coherent(usb_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);
}
#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;
stop_data_traffic(acm);
return 0;
}
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 (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
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;
}
static int acm_reset_resume(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
tty_port_tty_hangup(&acm->port, false);
return acm_resume(intf);
}
#endif /* CONFIG_PM */
USB: Exposing second ACM channel as tty for Nokia S60 phones. Nokia S60 phones expose two ACM channels. The first is a modem and is picked up by the standard AT-command interface information in the CDC-ACM driver. The second is marked as having a vendor-specific protocol. Normally, we don't expose those as ttys. (On some other devices, they may be claimed by the rndis_host driver and used as a network interface). But on S60 this second ACM channel is the way that third-party S60 application developers are expected to communicate over USB. It acts as a serial device at the S60 end, and so it should on Linux too. The list of devices is largely derived from: http://wiki.forum.nokia.com/index.php/S60_Platform_and_device_identification_codes http://wiki.forum.nokia.com/index.php/Nokia_USB_Product_IDs and includes only the S60 3rd Edition+ devices documented there. There are many devices for which the USB device ID is not documented, including: Nokia 6290 Nokia E63 Nokia 5630 XpressMusic Nokia 5730 XpressMusic Nokia 6710 Navigator Nokia 6720 classic Nokia 6730 Classic Nokia 6760 slide Nokia 6790 slide Nokia 6790 Surge Nokia E52 Nokia E55 Nokia E71x (AT&T) Nokia E72 Nokia E75 Nokia E75 US+LTA variant Nokia N79 Nokia N86 8MP Nokia 5230 (RM-588) Nokia 5230 (RM-594) Nokia 5530 XpressMusic Nokia 5530 XpressMusic (china) Nokia 5800 XM Nokia N97 (RM-506) Nokia N97 mini Nokia X6 It would be good to add those subsequently. Signed-off-by: Adrian Taylor <aat@realvnc.com> Acked-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-11-19 10:35:33 +00:00
#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(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,
},
USB: Exposing second ACM channel as tty for Nokia S60 phones. Nokia S60 phones expose two ACM channels. The first is a modem and is picked up by the standard AT-command interface information in the CDC-ACM driver. The second is marked as having a vendor-specific protocol. Normally, we don't expose those as ttys. (On some other devices, they may be claimed by the rndis_host driver and used as a network interface). But on S60 this second ACM channel is the way that third-party S60 application developers are expected to communicate over USB. It acts as a serial device at the S60 end, and so it should on Linux too. The list of devices is largely derived from: http://wiki.forum.nokia.com/index.php/S60_Platform_and_device_identification_codes http://wiki.forum.nokia.com/index.php/Nokia_USB_Product_IDs and includes only the S60 3rd Edition+ devices documented there. There are many devices for which the USB device ID is not documented, including: Nokia 6290 Nokia E63 Nokia 5630 XpressMusic Nokia 5730 XpressMusic Nokia 6710 Navigator Nokia 6720 classic Nokia 6730 Classic Nokia 6760 slide Nokia 6790 slide Nokia 6790 Surge Nokia E52 Nokia E55 Nokia E71x (AT&T) Nokia E72 Nokia E75 Nokia E75 US+LTA variant Nokia N79 Nokia N86 8MP Nokia 5230 (RM-588) Nokia 5230 (RM-594) Nokia 5530 XpressMusic Nokia 5530 XpressMusic (china) Nokia 5800 XM Nokia N97 (RM-506) Nokia N97 mini Nokia X6 It would be good to add those subsequently. Signed-off-by: Adrian Taylor <aat@realvnc.com> Acked-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-11-19 10:35:33 +00:00
/* 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) */
USB: Exposing second ACM channel as tty for Nokia S60 phones. Nokia S60 phones expose two ACM channels. The first is a modem and is picked up by the standard AT-command interface information in the CDC-ACM driver. The second is marked as having a vendor-specific protocol. Normally, we don't expose those as ttys. (On some other devices, they may be claimed by the rndis_host driver and used as a network interface). But on S60 this second ACM channel is the way that third-party S60 application developers are expected to communicate over USB. It acts as a serial device at the S60 end, and so it should on Linux too. The list of devices is largely derived from: http://wiki.forum.nokia.com/index.php/S60_Platform_and_device_identification_codes http://wiki.forum.nokia.com/index.php/Nokia_USB_Product_IDs and includes only the S60 3rd Edition+ devices documented there. There are many devices for which the USB device ID is not documented, including: Nokia 6290 Nokia E63 Nokia 5630 XpressMusic Nokia 5730 XpressMusic Nokia 6710 Navigator Nokia 6720 classic Nokia 6730 Classic Nokia 6760 slide Nokia 6790 slide Nokia 6790 Surge Nokia E52 Nokia E55 Nokia E71x (AT&T) Nokia E72 Nokia E75 Nokia E75 US+LTA variant Nokia N79 Nokia N86 8MP Nokia 5230 (RM-588) Nokia 5230 (RM-594) Nokia 5530 XpressMusic Nokia 5530 XpressMusic (china) Nokia 5800 XM Nokia N97 (RM-506) Nokia N97 mini Nokia X6 It would be good to add those subsequently. Signed-off-by: Adrian Taylor <aat@realvnc.com> Acked-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-11-19 10:35:33 +00:00
/* Support for Owen devices */
{ USB_DEVICE(0x03eb, 0x0030), }, /* Owen SI30 */
USB: Exposing second ACM channel as tty for Nokia S60 phones. Nokia S60 phones expose two ACM channels. The first is a modem and is picked up by the standard AT-command interface information in the CDC-ACM driver. The second is marked as having a vendor-specific protocol. Normally, we don't expose those as ttys. (On some other devices, they may be claimed by the rndis_host driver and used as a network interface). But on S60 this second ACM channel is the way that third-party S60 application developers are expected to communicate over USB. It acts as a serial device at the S60 end, and so it should on Linux too. The list of devices is largely derived from: http://wiki.forum.nokia.com/index.php/S60_Platform_and_device_identification_codes http://wiki.forum.nokia.com/index.php/Nokia_USB_Product_IDs and includes only the S60 3rd Edition+ devices documented there. There are many devices for which the USB device ID is not documented, including: Nokia 6290 Nokia E63 Nokia 5630 XpressMusic Nokia 5730 XpressMusic Nokia 6710 Navigator Nokia 6720 classic Nokia 6730 Classic Nokia 6760 slide Nokia 6790 slide Nokia 6790 Surge Nokia E52 Nokia E55 Nokia E71x (AT&T) Nokia E72 Nokia E75 Nokia E75 US+LTA variant Nokia N79 Nokia N86 8MP Nokia 5230 (RM-588) Nokia 5230 (RM-594) Nokia 5530 XpressMusic Nokia 5530 XpressMusic (china) Nokia 5800 XM Nokia N97 (RM-506) Nokia N97 mini Nokia X6 It would be good to add those subsequently. Signed-off-by: Adrian Taylor <aat@realvnc.com> Acked-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-11-19 10:35:33 +00:00
/* 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
USB: cdc_acm: Ignore Infineon Flash Loader utility Some modems, such as the Telit UE910, are using an Infineon Flash Loader utility. It has two interfaces, 2/2/0 (Abstract Modem) and 10/0/0 (CDC Data). The latter can be used as a serial interface to upgrade the firmware of the modem. However, that isn't possible when the cdc-acm driver takes control of the device. The following is an explanation of the behaviour by Daniele Palmas during discussion on linux-usb. "This is what happens when the device is turned on (without modifying the drivers): [155492.352031] usb 1-3: new high-speed USB device number 27 using ehci-pci [155492.485429] usb 1-3: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 255, changing to 11 [155492.485436] usb 1-3: New USB device found, idVendor=058b, idProduct=0041 [155492.485439] usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [155492.485952] cdc_acm 1-3:1.0: ttyACM0: USB ACM device This is the flashing device that is caught by the cdc-acm driver. Once the ttyACM appears, the application starts sending a magic string (simple write on the file descriptor) to keep the device in flashing mode. If this magic string is not properly received in a certain time interval, the modem goes on in normal operative mode: [155493.748094] usb 1-3: USB disconnect, device number 27 [155494.916025] usb 1-3: new high-speed USB device number 28 using ehci-pci [155495.059978] usb 1-3: New USB device found, idVendor=1bc7, idProduct=0021 [155495.059983] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [155495.059986] usb 1-3: Product: 6 CDC-ACM + 1 CDC-ECM [155495.059989] usb 1-3: Manufacturer: Telit [155495.059992] usb 1-3: SerialNumber: 359658044004697 [155495.138958] cdc_acm 1-3:1.0: ttyACM0: USB ACM device [155495.140832] cdc_acm 1-3:1.2: ttyACM1: USB ACM device [155495.142827] cdc_acm 1-3:1.4: ttyACM2: USB ACM device [155495.144462] cdc_acm 1-3:1.6: ttyACM3: USB ACM device [155495.145967] cdc_acm 1-3:1.8: ttyACM4: USB ACM device [155495.147588] cdc_acm 1-3:1.10: ttyACM5: USB ACM device [155495.154322] cdc_ether 1-3:1.12 wwan0: register 'cdc_ether' at usb-0000:00:1a.7-3, Mobile Broadband Network Device, 00:00:11:12:13:14 Using the cdc-acm driver, the string, though being sent in the same way than using the usb-serial-simple driver (I can confirm that the data is passing properly since I used an hw usb sniffer), does not make the device to stay in flashing mode." Signed-off-by: Jonas Jonsson <jonas@ludd.ltu.se> Tested-by: Daniele Palmas <dnlplm@gmail.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org>
2015-11-22 10:47:17 +00:00
/* 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) },
{ }
};
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
.id_table = acm_ids,
#ifdef CONFIG_PM
.supports_autosuspend = 1,
#endif
USB: Disable hub-initiated LPM for comms devices. Hub-initiated LPM is not good for USB communications devices. Comms devices should be able to tell when their link can go into a lower power state, because they know when an incoming transmission is finished. Ideally, these devices would slam their links into a lower power state, using the device-initiated LPM, after finishing the last packet of their data transfer. If we enable the idle timeouts for the parent hubs to enable hub-initiated LPM, we will get a lot of useless LPM packets on the bus as the devices reject LPM transitions when they're in the middle of receiving data. Worse, some devices might blindly accept the hub-initiated LPM and power down their radios while they're in the middle of receiving a transmission. The Intel Windows folks are disabling hub-initiated LPM for all USB communications devices under a xHCI USB 3.0 host. In order to keep the Linux behavior as close as possible to Windows, we need to do the same in Linux. Set the disable_hub_initiated_lpm flag for for all USB communications drivers. I know there aren't currently any USB 3.0 devices that implement these class specifications, but we should be ready if they do. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Marcel Holtmann <marcel@holtmann.org> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: Johan Hedberg <johan.hedberg@gmail.com> Cc: Hansjoerg Lipp <hjlipp@web.de> Cc: Tilman Schmidt <tilman@imap.cc> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Peter Korsgaard <jacmet@sunsite.dk> Cc: Jan Dumon <j.dumon@option.com> Cc: Petko Manolov <petkan@users.sourceforge.net> Cc: Steve Glendinning <steve.glendinning@smsc.com> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: Kalle Valo <kvalo@qca.qualcomm.com> Cc: "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com> Cc: Jouni Malinen <jouni@qca.qualcomm.com> Cc: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com> Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com> Cc: Christian Lamparter <chunkeey@googlemail.com> Cc: Brett Rudley <brudley@broadcom.com> Cc: Roland Vossen <rvossen@broadcom.com> Cc: Arend van Spriel <arend@broadcom.com> Cc: "Franky (Zhenhui) Lin" <frankyl@broadcom.com> Cc: Kan Yan <kanyan@broadcom.com> Cc: Dan Williams <dcbw@redhat.com> Cc: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Cc: Ivo van Doorn <IvDoorn@gmail.com> Cc: Gertjan van Wingerde <gwingerde@gmail.com> Cc: Helmut Schaa <helmut.schaa@googlemail.com> Cc: Herton Ronaldo Krzesinski <herton@canonical.com> Cc: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: Chaoming Li <chaoming_li@realsil.com.cn> Cc: Daniel Drake <dsd@gentoo.org> Cc: Ulrich Kunitz <kune@deine-taler.de> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
2012-04-23 17:08:51 +00:00
.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,
.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->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;
}
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);
}
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);