2005-04-17 06:20:36 +08:00
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/*
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* USB Serial Console driver
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*
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* Copyright (C) 2001 - 2002 Greg Kroah-Hartman (greg@kroah.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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2008-07-22 18:09:57 +08:00
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*
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2005-04-17 06:20:36 +08:00
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* Thanks to Randy Dunlap for the original version of this code.
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*
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*/
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#include <linux/kernel.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/console.h>
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#include <linux/usb.h>
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2006-07-12 12:22:58 +08:00
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#include <linux/usb/serial.h>
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2005-04-17 06:20:36 +08:00
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static int debug;
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struct usbcons_info {
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int magic;
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int break_flag;
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struct usb_serial_port *port;
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};
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static struct usbcons_info usbcons_info;
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static struct console usbcons;
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/*
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* ------------------------------------------------------------
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* USB Serial console driver
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*
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* Much of the code here is copied from drivers/char/serial.c
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* and implements a phony serial console in the same way that
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* serial.c does so that in case some software queries it,
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* it will get the same results.
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*
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* Things that are different from the way the serial port code
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* does things, is that we call the lower level usb-serial
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* driver code to initialize the device, and we set the initial
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* console speeds based on the command line arguments.
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* ------------------------------------------------------------
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*/
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/*
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* The parsing of the command line works exactly like the
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* serial.c code, except that the specifier is "ttyUSB" instead
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* of "ttyS".
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*/
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2006-04-13 05:41:59 +08:00
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static int usb_console_setup(struct console *co, char *options)
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2005-04-17 06:20:36 +08:00
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{
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struct usbcons_info *info = &usbcons_info;
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int baud = 9600;
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int bits = 8;
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int parity = 'n';
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int doflow = 0;
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int cflag = CREAD | HUPCL | CLOCAL;
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char *s;
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struct usb_serial *serial;
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struct usb_serial_port *port;
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int retval = 0;
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2007-11-14 06:22:07 +08:00
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struct tty_struct *tty = NULL;
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struct ktermios *termios = NULL, dummy;
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2005-04-17 06:20:36 +08:00
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2008-07-22 18:09:57 +08:00
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dbg("%s", __func__);
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2005-04-17 06:20:36 +08:00
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if (options) {
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baud = simple_strtoul(options, NULL, 10);
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s = options;
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while (*s >= '0' && *s <= '9')
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s++;
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if (*s)
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parity = *s++;
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if (*s)
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bits = *s++ - '0';
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if (*s)
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doflow = (*s++ == 'r');
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}
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2008-07-22 18:10:08 +08:00
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/* Sane default */
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if (baud == 0)
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baud = 9600;
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2005-04-17 06:20:36 +08:00
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switch (bits) {
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2008-07-22 18:09:57 +08:00
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case 7:
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cflag |= CS7;
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break;
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default:
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case 8:
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cflag |= CS8;
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break;
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2005-04-17 06:20:36 +08:00
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}
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switch (parity) {
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2008-07-22 18:09:57 +08:00
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case 'o': case 'O':
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cflag |= PARODD;
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break;
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case 'e': case 'E':
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cflag |= PARENB;
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break;
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2005-04-17 06:20:36 +08:00
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}
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co->cflag = cflag;
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2007-11-13 04:14:49 +08:00
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/*
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* no need to check the index here: if the index is wrong, console
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* code won't call us
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*/
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serial = usb_serial_get_by_index(co->index);
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2005-04-17 06:20:36 +08:00
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if (serial == NULL) {
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/* no device is connected yet, sorry :( */
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2008-07-22 18:09:57 +08:00
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err("No USB device connected to ttyUSB%i", co->index);
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2005-04-17 06:20:36 +08:00
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return -ENODEV;
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}
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port = serial->port[0];
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2008-07-22 18:09:07 +08:00
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port->port.tty = NULL;
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2005-04-17 06:20:36 +08:00
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info->port = port;
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2008-07-22 18:09:57 +08:00
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2008-07-22 18:09:07 +08:00
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++port->port.count;
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if (port->port.count == 1) {
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2007-11-14 06:22:07 +08:00
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if (serial->type->set_termios) {
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/*
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* allocate a fake tty so the driver can initialize
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* the termios structure, then later call set_termios to
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* configure according to command line arguments
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*/
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tty = kzalloc(sizeof(*tty), GFP_KERNEL);
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if (!tty) {
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retval = -ENOMEM;
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err("no more memory");
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goto reset_open_count;
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}
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termios = kzalloc(sizeof(*termios), GFP_KERNEL);
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if (!termios) {
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retval = -ENOMEM;
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err("no more memory");
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goto free_tty;
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}
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memset(&dummy, 0, sizeof(struct ktermios));
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tty->termios = termios;
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2008-07-22 18:09:07 +08:00
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port->port.tty = tty;
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2007-11-14 06:22:07 +08:00
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}
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2008-07-22 18:09:57 +08:00
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/* only call the device specific open if this
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2005-04-17 06:20:36 +08:00
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* is the first time the port is opened */
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if (serial->type->open)
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2008-07-22 18:09:07 +08:00
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retval = serial->type->open(NULL, port, NULL);
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2005-04-17 06:20:36 +08:00
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else
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2008-07-22 18:09:07 +08:00
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retval = usb_serial_generic_open(NULL, port, NULL);
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2005-04-17 06:20:36 +08:00
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2007-11-14 06:22:07 +08:00
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if (retval) {
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err("could not open USB console port");
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goto free_termios;
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2005-04-17 06:20:36 +08:00
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}
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2007-11-14 06:22:07 +08:00
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if (serial->type->set_termios) {
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termios->c_cflag = cflag;
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2008-07-22 18:10:08 +08:00
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tty_termios_encode_baud_rate(termios, baud, baud);
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2008-07-22 18:09:07 +08:00
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serial->type->set_termios(NULL, port, &dummy);
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2007-11-14 06:22:07 +08:00
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2008-07-22 18:09:07 +08:00
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port->port.tty = NULL;
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2007-11-14 06:22:07 +08:00
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kfree(termios);
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kfree(tty);
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2005-04-17 06:20:36 +08:00
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}
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}
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2007-11-14 06:22:07 +08:00
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USB: usb_serial: clean tty reference in the last close
When a usb serial adapter is used as console, the usb serial console
driver bumps the open_count on the port struct used but doesn't attach
a real tty to it (only a fake one temporaly). If this port is opened later
using the regular character device interface, the open method won't
initialize the port, which is the expected, and will receive a brand new
tty struct created by tty layer, which will be stored in port->tty.
When the last close is issued, open_count won't be 0 because of the
console usage and the port->tty will still contain the old tty value. This
is the last ttyUSB<n> close so the allocated tty will be freed by the
tty layer. The usb_serial and usb_serial_port are still in use by the
console, so port_free() won't be called (serial_close() ->
usb_serial_put() -> destroy_serial() -> port_free()), so the scheduled
work (port->work, usb_serial_port_work()) will still run. And
usb_serial_port_work() does:
(...)
tty = port->tty;
if (!tty)
return;
tty_wakeup(tty);
which causes (manually copied):
Faulting instruction address: 0x6b6b6b68
Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT PowerMac
Modules linked in: binfmt_misc ipv6 nfs lockd nfs_acl sunrpc dm_snapshot dm_mirror dm_mod hfsplus uinput ams input_polldev genrtc cpufreq_powersave i2c_powermac therm_adt746x snd_aoa_codec_tas snd_aoa_fabric_layout snd_aoa joydev snd_aoa_i2sbus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc pmac_zilog serial_core evdev ide_cd cdrom snd appletouch soundcore snd_aoa_soundbus bcm43xx firmware_class usbhid ieee80211softmac ff_memless firewire_ohci firewire_core ieee80211 ieee80211_crypt crc_itu_t sungem sungem_phy uninorth_agp agpart ssb
NIP: 6b6b6b68 LR: c01b2108 CTR: 6b6b6b6b
REGS: c106de80 TRAP: 0400 Not tainted (2.6.24-rc2)
MSR: 40009032 <EE,ME,IR,DR> CR: 82004024 XER: 00000000
TASK = c106b4c0[5] 'events/0' THREAD: c106c000
GPR00: 6b6b6b6b c106df30 c106b4c0 c2d613a0 00009032 00000001 00001a00 00000001
GPR08: 00000008 00000000 00000000 c106c000 42004028 00000000 016ffbe0 0171a724
GPR16: 016ffcf4 00240e24 00240e70 016fee68 016ff9a4 c03046c4 c0327f50 c03046fc
GPR24: c106b6b9 c106b4c0 c101d610 c106c000 c02160fc c1eac1dc c2d613ac c2d613a0
NIP [6b6b6b68] 0x6b6b6b68
LR [c01b2108] tty_wakeup+0x6c/0x9c
Call Trace:
[c106df30] [c01b20e8] tty_wakeup+0x4c/0x9c (unreliable)
[c106df40] [c0216138] usb_serial_port_work+0x3c/0x78
[c106df50] [c00432e8] run_workqueue+0xc4/0x15c
[c106df90] [c0043798] worker_thread+0xa0/0x124
[c106dfd0] [c0048224] kthread+0x48/0x84
[c106dff0] [c00129bc] kernel_thread+0x44/0x60
Instruction dump:
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
Slab corruption: size-2048 start=c2d613a0, len=2048
Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
Last user: [<c01b16d8>](release_one_tty+0xbc/0xf4)
050: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
Prev obj: start=c2d60b88, len=2048
Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
Last user: [<c00f30ec>](show_stat+0x410/0x428)
000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
This patch avoids this, clearing port->tty considering if the port is
used as serial console or not
Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-11-13 04:15:02 +08:00
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port->console = 1;
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2007-11-14 06:22:07 +08:00
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retval = 0;
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2005-04-17 06:20:36 +08:00
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2007-11-14 06:22:07 +08:00
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out:
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return retval;
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free_termios:
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kfree(termios);
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2008-07-22 18:09:07 +08:00
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port->port.tty = NULL;
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2007-11-14 06:22:07 +08:00
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free_tty:
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kfree(tty);
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reset_open_count:
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2008-07-22 18:09:07 +08:00
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port->port.count = 0;
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2007-11-14 06:22:07 +08:00
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goto out;
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2005-04-17 06:20:36 +08:00
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}
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2008-07-22 18:09:57 +08:00
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static void usb_console_write(struct console *co,
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const char *buf, unsigned count)
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2005-04-17 06:20:36 +08:00
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{
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static struct usbcons_info *info = &usbcons_info;
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struct usb_serial_port *port = info->port;
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struct usb_serial *serial;
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int retval = -ENODEV;
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2006-04-25 13:46:17 +08:00
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if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED)
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2005-04-17 06:20:36 +08:00
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return;
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serial = port->serial;
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if (count == 0)
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return;
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2008-03-04 08:08:34 +08:00
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dbg("%s - port %d, %d byte(s)", __func__, port->number, count);
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2005-04-17 06:20:36 +08:00
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2008-07-22 18:09:07 +08:00
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if (!port->port.count) {
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2008-07-22 18:09:57 +08:00
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dbg("%s - port not opened", __func__);
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2006-04-14 04:26:35 +08:00
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return;
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2005-04-17 06:20:36 +08:00
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}
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2006-04-14 04:26:35 +08:00
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while (count) {
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unsigned int i;
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unsigned int lf;
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/* search for LF so we can insert CR if necessary */
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2008-07-22 18:09:57 +08:00
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for (i = 0, lf = 0 ; i < count ; i++) {
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2006-04-14 04:26:35 +08:00
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if (*(buf + i) == 10) {
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lf = 1;
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i++;
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break;
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}
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}
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2008-07-22 18:09:57 +08:00
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/* pass on to the driver specific version of this function if
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it is available */
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2006-04-14 04:26:35 +08:00
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if (serial->type->write)
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2008-07-22 18:09:07 +08:00
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retval = serial->type->write(NULL, port, buf, i);
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2006-04-14 04:26:35 +08:00
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else
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2008-07-22 18:09:07 +08:00
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retval = usb_serial_generic_write(NULL, port, buf, i);
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2008-03-04 08:08:34 +08:00
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dbg("%s - return value : %d", __func__, retval);
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2006-04-14 04:26:35 +08:00
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if (lf) {
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/* append CR after LF */
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unsigned char cr = 13;
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if (serial->type->write)
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2008-07-22 18:09:57 +08:00
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retval = serial->type->write(NULL,
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port, &cr, 1);
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2006-04-14 04:26:35 +08:00
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else
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2008-07-22 18:09:57 +08:00
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retval = usb_serial_generic_write(NULL,
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port, &cr, 1);
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2008-03-04 08:08:34 +08:00
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dbg("%s - return value : %d", __func__, retval);
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2006-04-14 04:26:35 +08:00
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}
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buf += i;
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count -= i;
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}
|
2005-04-17 06:20:36 +08:00
|
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}
|
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static struct console usbcons = {
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.name = "ttyUSB",
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.write = usb_console_write,
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.setup = usb_console_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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|
|
2006-04-25 13:46:17 +08:00
|
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|
void usb_serial_console_disconnect(struct usb_serial *serial)
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{
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2008-07-22 18:09:57 +08:00
|
|
|
if (serial && serial->port && serial->port[0]
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&& serial->port[0] == usbcons_info.port) {
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2006-04-25 13:46:17 +08:00
|
|
|
usb_serial_console_exit();
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|
|
usb_serial_put(serial);
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|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-22 18:09:57 +08:00
|
|
|
void usb_serial_console_init(int serial_debug, int minor)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
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|
debug = serial_debug;
|
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|
|
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|
|
if (minor == 0) {
|
2008-07-22 18:09:57 +08:00
|
|
|
/*
|
2005-04-17 06:20:36 +08:00
|
|
|
* Call register_console() if this is the first device plugged
|
|
|
|
* in. If we call it earlier, then the callback to
|
|
|
|
* console_setup() will fail, as there is not a device seen by
|
|
|
|
* the USB subsystem yet.
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
* Register console.
|
|
|
|
* NOTES:
|
2008-07-22 18:09:57 +08:00
|
|
|
* console_setup() is called (back) immediately (from
|
|
|
|
* register_console). console_write() is called immediately
|
|
|
|
* from register_console iff CON_PRINTBUFFER is set in flags.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2008-07-22 18:09:57 +08:00
|
|
|
dbg("registering the USB serial console.");
|
2005-04-17 06:20:36 +08:00
|
|
|
register_console(&usbcons);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-22 18:09:57 +08:00
|
|
|
void usb_serial_console_exit(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-04-25 13:46:17 +08:00
|
|
|
if (usbcons_info.port) {
|
|
|
|
unregister_console(&usbcons);
|
2008-07-22 18:09:07 +08:00
|
|
|
if (usbcons_info.port->port.count)
|
|
|
|
usbcons_info.port->port.count--;
|
2006-04-25 13:46:17 +08:00
|
|
|
usbcons_info.port = NULL;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|