![Johan Hovold](/assets/img/avatar_default.png)
Fix race between probe and open by making sure that the disconnected flag is not cleared until all ports have been registered. A call to tty_open while probe is running may get a reference to the serial structure in serial_install before its ports have been registered. This may lead to usb_serial_core calling driver open before port is fully initialised. With ftdi_sio this result in the following NULL-pointer dereference as the private data has not been initialised at open: [ 199.698286] IP: [<f811a089>] ftdi_open+0x59/0xe0 [ftdi_sio] [ 199.698297] *pde = 00000000 [ 199.698303] Oops: 0000 [#1] PREEMPT SMP [ 199.698313] Modules linked in: ftdi_sio usbserial [ 199.698323] [ 199.698327] Pid: 1146, comm: ftdi_open Not tainted 3.2.11 #70 Dell Inc. Vostro 1520/0T816J [ 199.698339] EIP: 0060:[<f811a089>] EFLAGS: 00010286 CPU: 0 [ 199.698344] EIP is at ftdi_open+0x59/0xe0 [ftdi_sio] [ 199.698348] EAX: 0000003e EBX: f5067000 ECX: 00000000 EDX: 80000600 [ 199.698352] ESI: f48d8800 EDI: 00000001 EBP: f515dd54 ESP: f515dcfc [ 199.698356] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 199.698361] Process ftdi_open (pid: 1146, ti=f515c000 task=f481e040 task.ti=f515c000) [ 199.698364] Stack: [ 199.698368] f811a9fe f811a9e0 f811b3ef 00000000 00000000 00001388 00000000 f4a86800 [ 199.698387] 00000002 00000000 f806e68e 00000000 f532765c f481e040 00000246 22222222 [ 199.698479] 22222222 22222222 22222222 f5067004 f5327600 f5327638 f515dd74 f806e6ab [ 199.698496] Call Trace: [ 199.698504] [<f806e68e>] ? serial_activate+0x2e/0x70 [usbserial] [ 199.698511] [<f806e6ab>] serial_activate+0x4b/0x70 [usbserial] [ 199.698521] [<c126380c>] tty_port_open+0x7c/0xd0 [ 199.698527] [<f806e660>] ? serial_set_termios+0xa0/0xa0 [usbserial] [ 199.698534] [<f806e76f>] serial_open+0x2f/0x70 [usbserial] [ 199.698540] [<c125d07c>] tty_open+0x20c/0x510 [ 199.698546] [<c10e9eb7>] chrdev_open+0xe7/0x230 [ 199.698553] [<c10e48f2>] __dentry_open+0x1f2/0x390 [ 199.698559] [<c144bfec>] ? _raw_spin_unlock+0x2c/0x50 [ 199.698565] [<c10e4b76>] nameidata_to_filp+0x66/0x80 [ 199.698570] [<c10e9dd0>] ? cdev_put+0x20/0x20 [ 199.698576] [<c10f3e08>] do_last+0x198/0x730 [ 199.698581] [<c10f4440>] path_openat+0xa0/0x350 [ 199.698587] [<c10f47d5>] do_filp_open+0x35/0x80 [ 199.698593] [<c144bfec>] ? _raw_spin_unlock+0x2c/0x50 [ 199.698599] [<c10ff110>] ? alloc_fd+0xc0/0x100 [ 199.698605] [<c10f0b72>] ? getname_flags+0x72/0x120 [ 199.698611] [<c10e4450>] do_sys_open+0xf0/0x1c0 [ 199.698617] [<c11fcc08>] ? trace_hardirqs_on_thunk+0xc/0x10 [ 199.698623] [<c10e458e>] sys_open+0x2e/0x40 [ 199.698628] [<c144c990>] sysenter_do_call+0x12/0x36 [ 199.698632] Code: 85 89 00 00 00 8b 16 8b 4d c0 c1 e2 08 c7 44 24 14 88 13 00 00 81 ca 00 00 00 80 c7 44 24 10 00 00 00 00 c7 44 24 0c 00 00 00 00 <0f> b7 41 78 31 c9 89 44 24 08 c7 44 24 04 00 00 00 00 c7 04 24 [ 199.698884] EIP: [<f811a089>] ftdi_open+0x59/0xe0 [ftdi_sio] SS:ESP 0068:f515dcfc [ 199.698893] CR2: 0000000000000078 [ 199.698925] ---[ end trace 77c43ec023940cff ]--- Reported-and-tested-by: Ken Huang <csuhgw@gmail.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1447 lines
39 KiB
C
1447 lines
39 KiB
C
/*
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* USB Serial Converter driver
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*
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* Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2000 Peter Berger (pberger@brimson.com)
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* Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This driver was originally based on the ACM driver by Armin Fuerst (which was
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* based on a driver by Brad Keryan)
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*
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* See Documentation/usb/usb-serial.txt for more information on using this
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* driver
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/uaccess.h>
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#include <linux/serial.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/kfifo.h>
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#include "pl2303.h"
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/*
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* Version Information
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*/
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#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/"
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#define DRIVER_DESC "USB Serial Driver core"
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/* Driver structure we register with the USB core */
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static struct usb_driver usb_serial_driver = {
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.name = "usbserial",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.suspend = usb_serial_suspend,
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.resume = usb_serial_resume,
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.no_dynamic_id = 1,
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.supports_autosuspend = 1,
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};
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/* There is no MODULE_DEVICE_TABLE for usbserial.c. Instead
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the MODULE_DEVICE_TABLE declarations in each serial driver
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cause the "hotplug" program to pull in whatever module is necessary
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via modprobe, and modprobe will load usbserial because the serial
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drivers depend on it.
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*/
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static bool debug;
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/* initially all NULL */
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static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
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static DEFINE_MUTEX(table_lock);
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static LIST_HEAD(usb_serial_driver_list);
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/*
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* Look up the serial structure. If it is found and it hasn't been
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* disconnected, return with its disc_mutex held and its refcount
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* incremented. Otherwise return NULL.
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*/
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struct usb_serial *usb_serial_get_by_index(unsigned index)
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{
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struct usb_serial *serial;
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mutex_lock(&table_lock);
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serial = serial_table[index];
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if (serial) {
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mutex_lock(&serial->disc_mutex);
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if (serial->disconnected) {
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mutex_unlock(&serial->disc_mutex);
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serial = NULL;
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} else {
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kref_get(&serial->kref);
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}
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}
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mutex_unlock(&table_lock);
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return serial;
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}
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static struct usb_serial *get_free_serial(struct usb_serial *serial,
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int num_ports, unsigned int *minor)
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{
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unsigned int i, j;
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int good_spot;
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dbg("%s %d", __func__, num_ports);
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*minor = 0;
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mutex_lock(&table_lock);
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for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
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if (serial_table[i])
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continue;
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good_spot = 1;
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for (j = 1; j <= num_ports-1; ++j)
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if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) {
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good_spot = 0;
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i += j;
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break;
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}
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if (good_spot == 0)
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continue;
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*minor = i;
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j = 0;
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dbg("%s - minor base = %d", __func__, *minor);
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for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i) {
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serial_table[i] = serial;
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serial->port[j++]->number = i;
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}
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mutex_unlock(&table_lock);
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return serial;
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}
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mutex_unlock(&table_lock);
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return NULL;
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}
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static void return_serial(struct usb_serial *serial)
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{
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int i;
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dbg("%s", __func__);
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mutex_lock(&table_lock);
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for (i = 0; i < serial->num_ports; ++i)
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serial_table[serial->minor + i] = NULL;
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mutex_unlock(&table_lock);
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}
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static void destroy_serial(struct kref *kref)
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{
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struct usb_serial *serial;
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struct usb_serial_port *port;
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int i;
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serial = to_usb_serial(kref);
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dbg("%s - %s", __func__, serial->type->description);
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/* return the minor range that this device had */
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if (serial->minor != SERIAL_TTY_NO_MINOR)
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return_serial(serial);
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if (serial->attached)
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serial->type->release(serial);
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/* Now that nothing is using the ports, they can be freed */
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for (i = 0; i < serial->num_port_pointers; ++i) {
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port = serial->port[i];
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if (port) {
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port->serial = NULL;
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put_device(&port->dev);
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}
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}
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usb_put_dev(serial->dev);
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kfree(serial);
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}
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void usb_serial_put(struct usb_serial *serial)
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{
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kref_put(&serial->kref, destroy_serial);
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}
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/*****************************************************************************
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* Driver tty interface functions
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*****************************************************************************/
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/**
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* serial_install - install tty
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* @driver: the driver (USB in our case)
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* @tty: the tty being created
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*
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* Create the termios objects for this tty. We use the default
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* USB serial settings but permit them to be overridden by
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* serial->type->init_termios.
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*
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* This is the first place a new tty gets used. Hence this is where we
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* acquire references to the usb_serial structure and the driver module,
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* where we store a pointer to the port, and where we do an autoresume.
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* All these actions are reversed in serial_cleanup().
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*/
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static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
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{
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int idx = tty->index;
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struct usb_serial *serial;
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struct usb_serial_port *port;
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int retval = -ENODEV;
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dbg("%s", __func__);
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serial = usb_serial_get_by_index(idx);
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if (!serial)
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return retval;
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port = serial->port[idx - serial->minor];
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if (!port)
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goto error_no_port;
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if (!try_module_get(serial->type->driver.owner))
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goto error_module_get;
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retval = usb_autopm_get_interface(serial->interface);
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if (retval)
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goto error_get_interface;
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retval = tty_standard_install(driver, tty);
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if (retval)
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goto error_init_termios;
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mutex_unlock(&serial->disc_mutex);
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/* allow the driver to update the settings */
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if (serial->type->init_termios)
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serial->type->init_termios(tty);
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tty->driver_data = port;
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return retval;
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error_init_termios:
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usb_autopm_put_interface(serial->interface);
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error_get_interface:
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module_put(serial->type->driver.owner);
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error_module_get:
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error_no_port:
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usb_serial_put(serial);
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mutex_unlock(&serial->disc_mutex);
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return retval;
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}
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static int serial_activate(struct tty_port *tport, struct tty_struct *tty)
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{
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struct usb_serial_port *port =
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container_of(tport, struct usb_serial_port, port);
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struct usb_serial *serial = port->serial;
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int retval;
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mutex_lock(&serial->disc_mutex);
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if (serial->disconnected)
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retval = -ENODEV;
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else
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retval = port->serial->type->open(tty, port);
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mutex_unlock(&serial->disc_mutex);
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if (retval < 0)
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retval = usb_translate_errors(retval);
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return retval;
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}
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static int serial_open(struct tty_struct *tty, struct file *filp)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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return tty_port_open(&port->port, tty, filp);
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}
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/**
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* serial_down - shut down hardware
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* @tport: tty port to shut down
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*
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* Shut down a USB serial port unless it is the console. We never
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* shut down the console hardware as it will always be in use. Serialized
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* against activate by the tport mutex and kept to matching open/close pairs
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* of calls by the ASYNCB_INITIALIZED flag.
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*/
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static void serial_down(struct tty_port *tport)
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{
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struct usb_serial_port *port =
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container_of(tport, struct usb_serial_port, port);
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struct usb_serial_driver *drv = port->serial->type;
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/*
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* The console is magical. Do not hang up the console hardware
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* or there will be tears.
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*/
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if (port->port.console)
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return;
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if (drv->close)
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drv->close(port);
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}
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static void serial_hangup(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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tty_port_hangup(&port->port);
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}
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static void serial_close(struct tty_struct *tty, struct file *filp)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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tty_port_close(&port->port, tty, filp);
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}
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/**
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* serial_cleanup - free resources post close/hangup
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* @port: port to free up
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*
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* Do the resource freeing and refcount dropping for the port.
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* Avoid freeing the console.
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*
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* Called asynchronously after the last tty kref is dropped,
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* and the tty layer has already done the tty_shutdown(tty);
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*/
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static void serial_cleanup(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct usb_serial *serial;
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struct module *owner;
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/* The console is magical. Do not hang up the console hardware
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* or there will be tears.
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*/
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if (port->port.console)
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return;
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dbg("%s - port %d", __func__, port->number);
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tty->driver_data = NULL;
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serial = port->serial;
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owner = serial->type->driver.owner;
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mutex_lock(&serial->disc_mutex);
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if (!serial->disconnected)
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usb_autopm_put_interface(serial->interface);
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mutex_unlock(&serial->disc_mutex);
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usb_serial_put(serial);
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module_put(owner);
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}
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static int serial_write(struct tty_struct *tty, const unsigned char *buf,
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int count)
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{
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struct usb_serial_port *port = tty->driver_data;
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int retval = -ENODEV;
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if (port->serial->dev->state == USB_STATE_NOTATTACHED)
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goto exit;
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dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
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/* pass on to the driver specific version of this function */
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retval = port->serial->type->write(tty, port, buf, count);
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if (retval < 0)
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retval = usb_translate_errors(retval);
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exit:
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return retval;
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}
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static int serial_write_room(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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/* pass on to the driver specific version of this function */
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return port->serial->type->write_room(tty);
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}
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static int serial_chars_in_buffer(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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/* if the device was unplugged then any remaining characters
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fell out of the connector ;) */
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if (port->serial->disconnected)
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return 0;
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/* pass on to the driver specific version of this function */
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return port->serial->type->chars_in_buffer(tty);
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}
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static void serial_throttle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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/* pass on to the driver specific version of this function */
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if (port->serial->type->throttle)
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port->serial->type->throttle(tty);
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}
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static void serial_unthrottle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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/* pass on to the driver specific version of this function */
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if (port->serial->type->unthrottle)
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port->serial->type->unthrottle(tty);
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}
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static int serial_ioctl(struct tty_struct *tty,
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unsigned int cmd, unsigned long arg)
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{
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struct usb_serial_port *port = tty->driver_data;
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int retval = -ENODEV;
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dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
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/* pass on to the driver specific version of this function
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if it is available */
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if (port->serial->type->ioctl) {
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retval = port->serial->type->ioctl(tty, cmd, arg);
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} else
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retval = -ENOIOCTLCMD;
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return retval;
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}
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static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
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{
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struct usb_serial_port *port = tty->driver_data;
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dbg("%s - port %d", __func__, port->number);
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|
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/* pass on to the driver specific version of this function
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if it is available */
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if (port->serial->type->set_termios)
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port->serial->type->set_termios(tty, port, old);
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else
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tty_termios_copy_hw(tty->termios, old);
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}
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|
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static int serial_break(struct tty_struct *tty, int break_state)
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{
|
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struct usb_serial_port *port = tty->driver_data;
|
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|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
/* pass on to the driver specific version of this function
|
|
if it is available */
|
|
if (port->serial->type->break_ctl)
|
|
port->serial->type->break_ctl(tty, break_state);
|
|
return 0;
|
|
}
|
|
|
|
static int serial_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
struct usb_serial *serial;
|
|
int i;
|
|
char tmp[40];
|
|
|
|
dbg("%s", __func__);
|
|
seq_puts(m, "usbserinfo:1.0 driver:2.0\n");
|
|
for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
|
|
serial = usb_serial_get_by_index(i);
|
|
if (serial == NULL)
|
|
continue;
|
|
|
|
seq_printf(m, "%d:", i);
|
|
if (serial->type->driver.owner)
|
|
seq_printf(m, " module:%s",
|
|
module_name(serial->type->driver.owner));
|
|
seq_printf(m, " name:\"%s\"",
|
|
serial->type->description);
|
|
seq_printf(m, " vendor:%04x product:%04x",
|
|
le16_to_cpu(serial->dev->descriptor.idVendor),
|
|
le16_to_cpu(serial->dev->descriptor.idProduct));
|
|
seq_printf(m, " num_ports:%d", serial->num_ports);
|
|
seq_printf(m, " port:%d", i - serial->minor + 1);
|
|
usb_make_path(serial->dev, tmp, sizeof(tmp));
|
|
seq_printf(m, " path:%s", tmp);
|
|
|
|
seq_putc(m, '\n');
|
|
usb_serial_put(serial);
|
|
mutex_unlock(&serial->disc_mutex);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int serial_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, serial_proc_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations serial_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = serial_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int serial_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (port->serial->type->tiocmget)
|
|
return port->serial->type->tiocmget(tty);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int serial_tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (port->serial->type->tiocmset)
|
|
return port->serial->type->tiocmset(tty, set, clear);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int serial_get_icount(struct tty_struct *tty,
|
|
struct serial_icounter_struct *icount)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
if (port->serial->type->get_icount)
|
|
return port->serial->type->get_icount(tty, icount);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* We would be calling tty_wakeup here, but unfortunately some line
|
|
* disciplines have an annoying habit of calling tty->write from
|
|
* the write wakeup callback (e.g. n_hdlc.c).
|
|
*/
|
|
void usb_serial_port_softint(struct usb_serial_port *port)
|
|
{
|
|
schedule_work(&port->work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_port_softint);
|
|
|
|
static void usb_serial_port_work(struct work_struct *work)
|
|
{
|
|
struct usb_serial_port *port =
|
|
container_of(work, struct usb_serial_port, work);
|
|
struct tty_struct *tty;
|
|
|
|
dbg("%s - port %d", __func__, port->number);
|
|
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (!tty)
|
|
return;
|
|
|
|
tty_wakeup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
|
|
static void kill_traffic(struct usb_serial_port *port)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
|
|
usb_kill_urb(port->read_urbs[i]);
|
|
for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
|
|
usb_kill_urb(port->write_urbs[i]);
|
|
/*
|
|
* This is tricky.
|
|
* Some drivers submit the read_urb in the
|
|
* handler for the write_urb or vice versa
|
|
* this order determines the order in which
|
|
* usb_kill_urb() must be used to reliably
|
|
* kill the URBs. As it is unknown here,
|
|
* both orders must be used in turn.
|
|
* The call below is not redundant.
|
|
*/
|
|
usb_kill_urb(port->read_urb);
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
usb_kill_urb(port->interrupt_out_urb);
|
|
}
|
|
|
|
static void port_release(struct device *dev)
|
|
{
|
|
struct usb_serial_port *port = to_usb_serial_port(dev);
|
|
int i;
|
|
|
|
dbg ("%s - %s", __func__, dev_name(dev));
|
|
|
|
/*
|
|
* Stop all the traffic before cancelling the work, so that
|
|
* nobody will restart it by calling usb_serial_port_softint.
|
|
*/
|
|
kill_traffic(port);
|
|
cancel_work_sync(&port->work);
|
|
|
|
usb_free_urb(port->interrupt_in_urb);
|
|
usb_free_urb(port->interrupt_out_urb);
|
|
for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) {
|
|
usb_free_urb(port->read_urbs[i]);
|
|
kfree(port->bulk_in_buffers[i]);
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
|
|
usb_free_urb(port->write_urbs[i]);
|
|
kfree(port->bulk_out_buffers[i]);
|
|
}
|
|
kfifo_free(&port->write_fifo);
|
|
kfree(port->interrupt_in_buffer);
|
|
kfree(port->interrupt_out_buffer);
|
|
kfree(port);
|
|
}
|
|
|
|
static struct usb_serial *create_serial(struct usb_device *dev,
|
|
struct usb_interface *interface,
|
|
struct usb_serial_driver *driver)
|
|
{
|
|
struct usb_serial *serial;
|
|
|
|
serial = kzalloc(sizeof(*serial), GFP_KERNEL);
|
|
if (!serial) {
|
|
dev_err(&dev->dev, "%s - out of memory\n", __func__);
|
|
return NULL;
|
|
}
|
|
serial->dev = usb_get_dev(dev);
|
|
serial->type = driver;
|
|
serial->interface = interface;
|
|
kref_init(&serial->kref);
|
|
mutex_init(&serial->disc_mutex);
|
|
serial->minor = SERIAL_TTY_NO_MINOR;
|
|
|
|
return serial;
|
|
}
|
|
|
|
static const struct usb_device_id *match_dynamic_id(struct usb_interface *intf,
|
|
struct usb_serial_driver *drv)
|
|
{
|
|
struct usb_dynid *dynid;
|
|
|
|
spin_lock(&drv->dynids.lock);
|
|
list_for_each_entry(dynid, &drv->dynids.list, node) {
|
|
if (usb_match_one_id(intf, &dynid->id)) {
|
|
spin_unlock(&drv->dynids.lock);
|
|
return &dynid->id;
|
|
}
|
|
}
|
|
spin_unlock(&drv->dynids.lock);
|
|
return NULL;
|
|
}
|
|
|
|
static const struct usb_device_id *get_iface_id(struct usb_serial_driver *drv,
|
|
struct usb_interface *intf)
|
|
{
|
|
const struct usb_device_id *id;
|
|
|
|
id = usb_match_id(intf, drv->id_table);
|
|
if (id) {
|
|
dbg("static descriptor matches");
|
|
goto exit;
|
|
}
|
|
id = match_dynamic_id(intf, drv);
|
|
if (id)
|
|
dbg("dynamic descriptor matches");
|
|
exit:
|
|
return id;
|
|
}
|
|
|
|
/* Caller must hold table_lock */
|
|
static struct usb_serial_driver *search_serial_device(
|
|
struct usb_interface *iface)
|
|
{
|
|
const struct usb_device_id *id;
|
|
struct usb_serial_driver *drv;
|
|
|
|
/* Check if the usb id matches a known device */
|
|
list_for_each_entry(drv, &usb_serial_driver_list, driver_list) {
|
|
id = get_iface_id(drv, iface);
|
|
if (id)
|
|
return drv;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int serial_carrier_raised(struct tty_port *port)
|
|
{
|
|
struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
|
|
struct usb_serial_driver *drv = p->serial->type;
|
|
|
|
if (drv->carrier_raised)
|
|
return drv->carrier_raised(p);
|
|
/* No carrier control - don't block */
|
|
return 1;
|
|
}
|
|
|
|
static void serial_dtr_rts(struct tty_port *port, int on)
|
|
{
|
|
struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
|
|
struct usb_serial_driver *drv = p->serial->type;
|
|
|
|
if (drv->dtr_rts)
|
|
drv->dtr_rts(p, on);
|
|
}
|
|
|
|
static const struct tty_port_operations serial_port_ops = {
|
|
.carrier_raised = serial_carrier_raised,
|
|
.dtr_rts = serial_dtr_rts,
|
|
.activate = serial_activate,
|
|
.shutdown = serial_down,
|
|
};
|
|
|
|
int usb_serial_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_device *dev = interface_to_usbdev(interface);
|
|
struct usb_serial *serial = NULL;
|
|
struct usb_serial_port *port;
|
|
struct usb_host_interface *iface_desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
|
|
struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
|
|
struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
|
|
struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
|
|
struct usb_serial_driver *type = NULL;
|
|
int retval;
|
|
unsigned int minor;
|
|
int buffer_size;
|
|
int i;
|
|
int j;
|
|
int num_interrupt_in = 0;
|
|
int num_interrupt_out = 0;
|
|
int num_bulk_in = 0;
|
|
int num_bulk_out = 0;
|
|
int num_ports = 0;
|
|
int max_endpoints;
|
|
|
|
mutex_lock(&table_lock);
|
|
type = search_serial_device(interface);
|
|
if (!type) {
|
|
mutex_unlock(&table_lock);
|
|
dbg("none matched");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!try_module_get(type->driver.owner)) {
|
|
mutex_unlock(&table_lock);
|
|
dev_err(&interface->dev, "module get failed, exiting\n");
|
|
return -EIO;
|
|
}
|
|
mutex_unlock(&table_lock);
|
|
|
|
serial = create_serial(dev, interface, type);
|
|
if (!serial) {
|
|
module_put(type->driver.owner);
|
|
dev_err(&interface->dev, "%s - out of memory\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* if this device type has a probe function, call it */
|
|
if (type->probe) {
|
|
const struct usb_device_id *id;
|
|
|
|
id = get_iface_id(type, interface);
|
|
retval = type->probe(serial, id);
|
|
|
|
if (retval) {
|
|
dbg("sub driver rejected device");
|
|
kfree(serial);
|
|
module_put(type->driver.owner);
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
/* descriptor matches, let's find the endpoints needed */
|
|
/* check out the endpoints */
|
|
iface_desc = interface->cur_altsetting;
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
|
|
if (usb_endpoint_is_bulk_in(endpoint)) {
|
|
/* we found a bulk in endpoint */
|
|
dbg("found bulk in on endpoint %d", i);
|
|
bulk_in_endpoint[num_bulk_in] = endpoint;
|
|
++num_bulk_in;
|
|
}
|
|
|
|
if (usb_endpoint_is_bulk_out(endpoint)) {
|
|
/* we found a bulk out endpoint */
|
|
dbg("found bulk out on endpoint %d", i);
|
|
bulk_out_endpoint[num_bulk_out] = endpoint;
|
|
++num_bulk_out;
|
|
}
|
|
|
|
if (usb_endpoint_is_int_in(endpoint)) {
|
|
/* we found a interrupt in endpoint */
|
|
dbg("found interrupt in on endpoint %d", i);
|
|
interrupt_in_endpoint[num_interrupt_in] = endpoint;
|
|
++num_interrupt_in;
|
|
}
|
|
|
|
if (usb_endpoint_is_int_out(endpoint)) {
|
|
/* we found an interrupt out endpoint */
|
|
dbg("found interrupt out on endpoint %d", i);
|
|
interrupt_out_endpoint[num_interrupt_out] = endpoint;
|
|
++num_interrupt_out;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
|
|
/* BEGIN HORRIBLE HACK FOR PL2303 */
|
|
/* this is needed due to the looney way its endpoints are set up */
|
|
if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
|
|
(le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
|
|
((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
|
|
(le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
|
|
((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
|
|
(le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
|
|
((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
|
|
(le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
|
|
if (interface != dev->actconfig->interface[0]) {
|
|
/* check out the endpoints of the other interface*/
|
|
iface_desc = dev->actconfig->interface[0]->cur_altsetting;
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
if (usb_endpoint_is_int_in(endpoint)) {
|
|
/* we found a interrupt in endpoint */
|
|
dbg("found interrupt in for Prolific device on separate interface");
|
|
interrupt_in_endpoint[num_interrupt_in] = endpoint;
|
|
++num_interrupt_in;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Now make sure the PL-2303 is configured correctly.
|
|
* If not, give up now and hope this hack will work
|
|
* properly during a later invocation of usb_serial_probe
|
|
*/
|
|
if (num_bulk_in == 0 || num_bulk_out == 0) {
|
|
dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
|
|
kfree(serial);
|
|
module_put(type->driver.owner);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
/* END HORRIBLE HACK FOR PL2303 */
|
|
#endif
|
|
|
|
#ifdef CONFIG_USB_SERIAL_GENERIC
|
|
if (type == &usb_serial_generic_device) {
|
|
num_ports = num_bulk_out;
|
|
if (num_ports == 0) {
|
|
dev_err(&interface->dev,
|
|
"Generic device with no bulk out, not allowed.\n");
|
|
kfree(serial);
|
|
module_put(type->driver.owner);
|
|
return -EIO;
|
|
}
|
|
}
|
|
#endif
|
|
if (!num_ports) {
|
|
/* if this device type has a calc_num_ports function, call it */
|
|
if (type->calc_num_ports)
|
|
num_ports = type->calc_num_ports(serial);
|
|
if (!num_ports)
|
|
num_ports = type->num_ports;
|
|
}
|
|
|
|
serial->num_ports = num_ports;
|
|
serial->num_bulk_in = num_bulk_in;
|
|
serial->num_bulk_out = num_bulk_out;
|
|
serial->num_interrupt_in = num_interrupt_in;
|
|
serial->num_interrupt_out = num_interrupt_out;
|
|
|
|
/* found all that we need */
|
|
dev_info(&interface->dev, "%s converter detected\n",
|
|
type->description);
|
|
|
|
/* create our ports, we need as many as the max endpoints */
|
|
/* we don't use num_ports here because some devices have more
|
|
endpoint pairs than ports */
|
|
max_endpoints = max(num_bulk_in, num_bulk_out);
|
|
max_endpoints = max(max_endpoints, num_interrupt_in);
|
|
max_endpoints = max(max_endpoints, num_interrupt_out);
|
|
max_endpoints = max(max_endpoints, (int)serial->num_ports);
|
|
serial->num_port_pointers = max_endpoints;
|
|
|
|
dbg("%s - setting up %d port structures for this device",
|
|
__func__, max_endpoints);
|
|
for (i = 0; i < max_endpoints; ++i) {
|
|
port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
|
|
if (!port)
|
|
goto probe_error;
|
|
tty_port_init(&port->port);
|
|
port->port.ops = &serial_port_ops;
|
|
port->serial = serial;
|
|
spin_lock_init(&port->lock);
|
|
/* Keep this for private driver use for the moment but
|
|
should probably go away */
|
|
INIT_WORK(&port->work, usb_serial_port_work);
|
|
serial->port[i] = port;
|
|
port->dev.parent = &interface->dev;
|
|
port->dev.driver = NULL;
|
|
port->dev.bus = &usb_serial_bus_type;
|
|
port->dev.release = &port_release;
|
|
device_initialize(&port->dev);
|
|
}
|
|
|
|
/* set up the endpoint information */
|
|
for (i = 0; i < num_bulk_in; ++i) {
|
|
endpoint = bulk_in_endpoint[i];
|
|
port = serial->port[i];
|
|
buffer_size = max_t(int, serial->type->bulk_in_size,
|
|
usb_endpoint_maxp(endpoint));
|
|
port->bulk_in_size = buffer_size;
|
|
port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
|
|
|
|
for (j = 0; j < ARRAY_SIZE(port->read_urbs); ++j) {
|
|
set_bit(j, &port->read_urbs_free);
|
|
port->read_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!port->read_urbs[j]) {
|
|
dev_err(&interface->dev,
|
|
"No free urbs available\n");
|
|
goto probe_error;
|
|
}
|
|
port->bulk_in_buffers[j] = kmalloc(buffer_size,
|
|
GFP_KERNEL);
|
|
if (!port->bulk_in_buffers[j]) {
|
|
dev_err(&interface->dev,
|
|
"Couldn't allocate bulk_in_buffer\n");
|
|
goto probe_error;
|
|
}
|
|
usb_fill_bulk_urb(port->read_urbs[j], dev,
|
|
usb_rcvbulkpipe(dev,
|
|
endpoint->bEndpointAddress),
|
|
port->bulk_in_buffers[j], buffer_size,
|
|
serial->type->read_bulk_callback,
|
|
port);
|
|
}
|
|
|
|
port->read_urb = port->read_urbs[0];
|
|
port->bulk_in_buffer = port->bulk_in_buffers[0];
|
|
}
|
|
|
|
for (i = 0; i < num_bulk_out; ++i) {
|
|
endpoint = bulk_out_endpoint[i];
|
|
port = serial->port[i];
|
|
if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL))
|
|
goto probe_error;
|
|
buffer_size = serial->type->bulk_out_size;
|
|
if (!buffer_size)
|
|
buffer_size = usb_endpoint_maxp(endpoint);
|
|
port->bulk_out_size = buffer_size;
|
|
port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
|
|
|
|
for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
|
|
set_bit(j, &port->write_urbs_free);
|
|
port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!port->write_urbs[j]) {
|
|
dev_err(&interface->dev,
|
|
"No free urbs available\n");
|
|
goto probe_error;
|
|
}
|
|
port->bulk_out_buffers[j] = kmalloc(buffer_size,
|
|
GFP_KERNEL);
|
|
if (!port->bulk_out_buffers[j]) {
|
|
dev_err(&interface->dev,
|
|
"Couldn't allocate bulk_out_buffer\n");
|
|
goto probe_error;
|
|
}
|
|
usb_fill_bulk_urb(port->write_urbs[j], dev,
|
|
usb_sndbulkpipe(dev,
|
|
endpoint->bEndpointAddress),
|
|
port->bulk_out_buffers[j], buffer_size,
|
|
serial->type->write_bulk_callback,
|
|
port);
|
|
}
|
|
|
|
port->write_urb = port->write_urbs[0];
|
|
port->bulk_out_buffer = port->bulk_out_buffers[0];
|
|
}
|
|
|
|
if (serial->type->read_int_callback) {
|
|
for (i = 0; i < num_interrupt_in; ++i) {
|
|
endpoint = interrupt_in_endpoint[i];
|
|
port = serial->port[i];
|
|
port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!port->interrupt_in_urb) {
|
|
dev_err(&interface->dev,
|
|
"No free urbs available\n");
|
|
goto probe_error;
|
|
}
|
|
buffer_size = usb_endpoint_maxp(endpoint);
|
|
port->interrupt_in_endpointAddress =
|
|
endpoint->bEndpointAddress;
|
|
port->interrupt_in_buffer = kmalloc(buffer_size,
|
|
GFP_KERNEL);
|
|
if (!port->interrupt_in_buffer) {
|
|
dev_err(&interface->dev,
|
|
"Couldn't allocate interrupt_in_buffer\n");
|
|
goto probe_error;
|
|
}
|
|
usb_fill_int_urb(port->interrupt_in_urb, dev,
|
|
usb_rcvintpipe(dev,
|
|
endpoint->bEndpointAddress),
|
|
port->interrupt_in_buffer, buffer_size,
|
|
serial->type->read_int_callback, port,
|
|
endpoint->bInterval);
|
|
}
|
|
} else if (num_interrupt_in) {
|
|
dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
|
|
}
|
|
|
|
if (serial->type->write_int_callback) {
|
|
for (i = 0; i < num_interrupt_out; ++i) {
|
|
endpoint = interrupt_out_endpoint[i];
|
|
port = serial->port[i];
|
|
port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!port->interrupt_out_urb) {
|
|
dev_err(&interface->dev,
|
|
"No free urbs available\n");
|
|
goto probe_error;
|
|
}
|
|
buffer_size = usb_endpoint_maxp(endpoint);
|
|
port->interrupt_out_size = buffer_size;
|
|
port->interrupt_out_endpointAddress =
|
|
endpoint->bEndpointAddress;
|
|
port->interrupt_out_buffer = kmalloc(buffer_size,
|
|
GFP_KERNEL);
|
|
if (!port->interrupt_out_buffer) {
|
|
dev_err(&interface->dev,
|
|
"Couldn't allocate interrupt_out_buffer\n");
|
|
goto probe_error;
|
|
}
|
|
usb_fill_int_urb(port->interrupt_out_urb, dev,
|
|
usb_sndintpipe(dev,
|
|
endpoint->bEndpointAddress),
|
|
port->interrupt_out_buffer, buffer_size,
|
|
serial->type->write_int_callback, port,
|
|
endpoint->bInterval);
|
|
}
|
|
} else if (num_interrupt_out) {
|
|
dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
|
|
}
|
|
|
|
/* if this device type has an attach function, call it */
|
|
if (type->attach) {
|
|
retval = type->attach(serial);
|
|
if (retval < 0)
|
|
goto probe_error;
|
|
serial->attached = 1;
|
|
if (retval > 0) {
|
|
/* quietly accept this device, but don't bind to a
|
|
serial port as it's about to disappear */
|
|
serial->num_ports = 0;
|
|
goto exit;
|
|
}
|
|
} else {
|
|
serial->attached = 1;
|
|
}
|
|
|
|
/* Avoid race with tty_open and serial_install by setting the
|
|
* disconnected flag and not clearing it until all ports have been
|
|
* registered.
|
|
*/
|
|
serial->disconnected = 1;
|
|
|
|
if (get_free_serial(serial, num_ports, &minor) == NULL) {
|
|
dev_err(&interface->dev, "No more free serial devices\n");
|
|
goto probe_error;
|
|
}
|
|
serial->minor = minor;
|
|
|
|
/* register all of the individual ports with the driver core */
|
|
for (i = 0; i < num_ports; ++i) {
|
|
port = serial->port[i];
|
|
dev_set_name(&port->dev, "ttyUSB%d", port->number);
|
|
dbg ("%s - registering %s", __func__, dev_name(&port->dev));
|
|
device_enable_async_suspend(&port->dev);
|
|
|
|
retval = device_add(&port->dev);
|
|
if (retval)
|
|
dev_err(&port->dev, "Error registering port device, "
|
|
"continuing\n");
|
|
}
|
|
|
|
serial->disconnected = 0;
|
|
|
|
usb_serial_console_init(debug, minor);
|
|
|
|
exit:
|
|
/* success */
|
|
usb_set_intfdata(interface, serial);
|
|
module_put(type->driver.owner);
|
|
return 0;
|
|
|
|
probe_error:
|
|
usb_serial_put(serial);
|
|
module_put(type->driver.owner);
|
|
return -EIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_probe);
|
|
|
|
void usb_serial_disconnect(struct usb_interface *interface)
|
|
{
|
|
int i;
|
|
struct usb_serial *serial = usb_get_intfdata(interface);
|
|
struct device *dev = &interface->dev;
|
|
struct usb_serial_port *port;
|
|
|
|
usb_serial_console_disconnect(serial);
|
|
dbg("%s", __func__);
|
|
|
|
mutex_lock(&serial->disc_mutex);
|
|
usb_set_intfdata(interface, NULL);
|
|
/* must set a flag, to signal subdrivers */
|
|
serial->disconnected = 1;
|
|
mutex_unlock(&serial->disc_mutex);
|
|
|
|
for (i = 0; i < serial->num_ports; ++i) {
|
|
port = serial->port[i];
|
|
if (port) {
|
|
struct tty_struct *tty = tty_port_tty_get(&port->port);
|
|
if (tty) {
|
|
tty_vhangup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
kill_traffic(port);
|
|
cancel_work_sync(&port->work);
|
|
if (device_is_registered(&port->dev))
|
|
device_del(&port->dev);
|
|
}
|
|
}
|
|
serial->type->disconnect(serial);
|
|
|
|
/* let the last holder of this object cause it to be cleaned up */
|
|
usb_serial_put(serial);
|
|
dev_info(dev, "device disconnected\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_disconnect);
|
|
|
|
int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct usb_serial *serial = usb_get_intfdata(intf);
|
|
struct usb_serial_port *port;
|
|
int i, r = 0;
|
|
|
|
serial->suspending = 1;
|
|
|
|
if (serial->type->suspend) {
|
|
r = serial->type->suspend(serial, message);
|
|
if (r < 0) {
|
|
serial->suspending = 0;
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < serial->num_ports; ++i) {
|
|
port = serial->port[i];
|
|
if (port)
|
|
kill_traffic(port);
|
|
}
|
|
|
|
err_out:
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL(usb_serial_suspend);
|
|
|
|
int usb_serial_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_serial *serial = usb_get_intfdata(intf);
|
|
int rv;
|
|
|
|
serial->suspending = 0;
|
|
if (serial->type->resume)
|
|
rv = serial->type->resume(serial);
|
|
else
|
|
rv = usb_serial_generic_resume(serial);
|
|
|
|
return rv;
|
|
}
|
|
EXPORT_SYMBOL(usb_serial_resume);
|
|
|
|
static const struct tty_operations serial_ops = {
|
|
.open = serial_open,
|
|
.close = serial_close,
|
|
.write = serial_write,
|
|
.hangup = serial_hangup,
|
|
.write_room = serial_write_room,
|
|
.ioctl = serial_ioctl,
|
|
.set_termios = serial_set_termios,
|
|
.throttle = serial_throttle,
|
|
.unthrottle = serial_unthrottle,
|
|
.break_ctl = serial_break,
|
|
.chars_in_buffer = serial_chars_in_buffer,
|
|
.tiocmget = serial_tiocmget,
|
|
.tiocmset = serial_tiocmset,
|
|
.get_icount = serial_get_icount,
|
|
.cleanup = serial_cleanup,
|
|
.install = serial_install,
|
|
.proc_fops = &serial_proc_fops,
|
|
};
|
|
|
|
|
|
struct tty_driver *usb_serial_tty_driver;
|
|
|
|
static int __init usb_serial_init(void)
|
|
{
|
|
int i;
|
|
int result;
|
|
|
|
usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
|
|
if (!usb_serial_tty_driver)
|
|
return -ENOMEM;
|
|
|
|
/* Initialize our global data */
|
|
for (i = 0; i < SERIAL_TTY_MINORS; ++i)
|
|
serial_table[i] = NULL;
|
|
|
|
result = bus_register(&usb_serial_bus_type);
|
|
if (result) {
|
|
printk(KERN_ERR "usb-serial: %s - registering bus driver "
|
|
"failed\n", __func__);
|
|
goto exit_bus;
|
|
}
|
|
|
|
usb_serial_tty_driver->driver_name = "usbserial";
|
|
usb_serial_tty_driver->name = "ttyUSB";
|
|
usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
|
|
usb_serial_tty_driver->minor_start = 0;
|
|
usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW |
|
|
TTY_DRIVER_DYNAMIC_DEV;
|
|
usb_serial_tty_driver->init_termios = tty_std_termios;
|
|
usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD
|
|
| HUPCL | CLOCAL;
|
|
usb_serial_tty_driver->init_termios.c_ispeed = 9600;
|
|
usb_serial_tty_driver->init_termios.c_ospeed = 9600;
|
|
tty_set_operations(usb_serial_tty_driver, &serial_ops);
|
|
result = tty_register_driver(usb_serial_tty_driver);
|
|
if (result) {
|
|
printk(KERN_ERR "usb-serial: %s - tty_register_driver failed\n",
|
|
__func__);
|
|
goto exit_reg_driver;
|
|
}
|
|
|
|
/* register the USB driver */
|
|
result = usb_register(&usb_serial_driver);
|
|
if (result < 0) {
|
|
printk(KERN_ERR "usb-serial: %s - usb_register failed\n",
|
|
__func__);
|
|
goto exit_tty;
|
|
}
|
|
|
|
/* register the generic driver, if we should */
|
|
result = usb_serial_generic_register(debug);
|
|
if (result < 0) {
|
|
printk(KERN_ERR "usb-serial: %s - registering generic "
|
|
"driver failed\n", __func__);
|
|
goto exit_generic;
|
|
}
|
|
|
|
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
|
|
|
|
return result;
|
|
|
|
exit_generic:
|
|
usb_deregister(&usb_serial_driver);
|
|
|
|
exit_tty:
|
|
tty_unregister_driver(usb_serial_tty_driver);
|
|
|
|
exit_reg_driver:
|
|
bus_unregister(&usb_serial_bus_type);
|
|
|
|
exit_bus:
|
|
printk(KERN_ERR "usb-serial: %s - returning with error %d\n",
|
|
__func__, result);
|
|
put_tty_driver(usb_serial_tty_driver);
|
|
return result;
|
|
}
|
|
|
|
|
|
static void __exit usb_serial_exit(void)
|
|
{
|
|
usb_serial_console_exit();
|
|
|
|
usb_serial_generic_deregister();
|
|
|
|
usb_deregister(&usb_serial_driver);
|
|
tty_unregister_driver(usb_serial_tty_driver);
|
|
put_tty_driver(usb_serial_tty_driver);
|
|
bus_unregister(&usb_serial_bus_type);
|
|
}
|
|
|
|
|
|
module_init(usb_serial_init);
|
|
module_exit(usb_serial_exit);
|
|
|
|
#define set_to_generic_if_null(type, function) \
|
|
do { \
|
|
if (!type->function) { \
|
|
type->function = usb_serial_generic_##function; \
|
|
dbg("Had to override the " #function \
|
|
" usb serial operation with the generic one.");\
|
|
} \
|
|
} while (0)
|
|
|
|
static void fixup_generic(struct usb_serial_driver *device)
|
|
{
|
|
set_to_generic_if_null(device, open);
|
|
set_to_generic_if_null(device, write);
|
|
set_to_generic_if_null(device, close);
|
|
set_to_generic_if_null(device, write_room);
|
|
set_to_generic_if_null(device, chars_in_buffer);
|
|
set_to_generic_if_null(device, read_bulk_callback);
|
|
set_to_generic_if_null(device, write_bulk_callback);
|
|
set_to_generic_if_null(device, disconnect);
|
|
set_to_generic_if_null(device, release);
|
|
set_to_generic_if_null(device, process_read_urb);
|
|
set_to_generic_if_null(device, prepare_write_buffer);
|
|
}
|
|
|
|
static int usb_serial_register(struct usb_serial_driver *driver)
|
|
{
|
|
int retval;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
fixup_generic(driver);
|
|
|
|
if (!driver->description)
|
|
driver->description = driver->driver.name;
|
|
if (!driver->usb_driver) {
|
|
WARN(1, "Serial driver %s has no usb_driver\n",
|
|
driver->description);
|
|
return -EINVAL;
|
|
}
|
|
driver->usb_driver->supports_autosuspend = 1;
|
|
|
|
/* Add this device to our list of devices */
|
|
mutex_lock(&table_lock);
|
|
list_add(&driver->driver_list, &usb_serial_driver_list);
|
|
|
|
retval = usb_serial_bus_register(driver);
|
|
if (retval) {
|
|
printk(KERN_ERR "usb-serial: problem %d when registering "
|
|
"driver %s\n", retval, driver->description);
|
|
list_del(&driver->driver_list);
|
|
} else
|
|
printk(KERN_INFO "USB Serial support registered for %s\n",
|
|
driver->description);
|
|
|
|
mutex_unlock(&table_lock);
|
|
return retval;
|
|
}
|
|
|
|
static void usb_serial_deregister(struct usb_serial_driver *device)
|
|
{
|
|
printk(KERN_INFO "USB Serial deregistering driver %s\n",
|
|
device->description);
|
|
mutex_lock(&table_lock);
|
|
list_del(&device->driver_list);
|
|
usb_serial_bus_deregister(device);
|
|
mutex_unlock(&table_lock);
|
|
}
|
|
|
|
/**
|
|
* usb_serial_register_drivers - register drivers for a usb-serial module
|
|
* @udriver: usb_driver used for matching devices/interfaces
|
|
* @serial_drivers: NULL-terminated array of pointers to drivers to be registered
|
|
*
|
|
* Registers @udriver and all the drivers in the @serial_drivers array.
|
|
* Automatically fills in the .no_dynamic_id field in @udriver and
|
|
* the .usb_driver field in each serial driver.
|
|
*/
|
|
int usb_serial_register_drivers(struct usb_driver *udriver,
|
|
struct usb_serial_driver * const serial_drivers[])
|
|
{
|
|
int rc;
|
|
const struct usb_device_id *saved_id_table;
|
|
struct usb_serial_driver * const *sd;
|
|
|
|
/*
|
|
* udriver must be registered before any of the serial drivers,
|
|
* because the store_new_id() routine for the serial drivers (in
|
|
* bus.c) probes udriver.
|
|
*
|
|
* Performance hack: We don't want udriver to be probed until
|
|
* the serial drivers are registered, because the probe would
|
|
* simply fail for lack of a matching serial driver.
|
|
* Therefore save off udriver's id_table until we are all set.
|
|
*/
|
|
saved_id_table = udriver->id_table;
|
|
udriver->id_table = NULL;
|
|
|
|
udriver->no_dynamic_id = 1;
|
|
rc = usb_register(udriver);
|
|
if (rc)
|
|
return rc;
|
|
|
|
for (sd = serial_drivers; *sd; ++sd) {
|
|
(*sd)->usb_driver = udriver;
|
|
rc = usb_serial_register(*sd);
|
|
if (rc)
|
|
goto failed;
|
|
}
|
|
|
|
/* Now restore udriver's id_table and look for matches */
|
|
udriver->id_table = saved_id_table;
|
|
rc = driver_attach(&udriver->drvwrap.driver);
|
|
return 0;
|
|
|
|
failed:
|
|
while (sd-- > serial_drivers)
|
|
usb_serial_deregister(*sd);
|
|
usb_deregister(udriver);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_register_drivers);
|
|
|
|
/**
|
|
* usb_serial_deregister_drivers - deregister drivers for a usb-serial module
|
|
* @udriver: usb_driver to unregister
|
|
* @serial_drivers: NULL-terminated array of pointers to drivers to be deregistered
|
|
*
|
|
* Deregisters @udriver and all the drivers in the @serial_drivers array.
|
|
*/
|
|
void usb_serial_deregister_drivers(struct usb_driver *udriver,
|
|
struct usb_serial_driver * const serial_drivers[])
|
|
{
|
|
for (; *serial_drivers; ++serial_drivers)
|
|
usb_serial_deregister(*serial_drivers);
|
|
usb_deregister(udriver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_serial_deregister_drivers);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|