Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * USB Serial Console driver |
| 3 | * |
| 4 | * Copyright (C) 2001 - 2002 Greg Kroah-Hartman (greg@kroah.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License version |
| 8 | * 2 as published by the Free Software Foundation. |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * Thanks to Randy Dunlap for the original version of this code. |
| 11 | * |
| 12 | */ |
| 13 | |
Greg Kroah-Hartman | 92931d2 | 2012-09-13 16:30:31 -0700 | [diff] [blame] | 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/kernel.h> |
Johan Hovold | 5ee0089 | 2015-02-16 13:17:33 +0700 | [diff] [blame] | 17 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/slab.h> |
| 19 | #include <linux/tty.h> |
| 20 | #include <linux/console.h> |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 21 | #include <linux/serial.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/usb.h> |
Greg Kroah-Hartman | a969888 | 2006-07-11 21:22:58 -0700 | [diff] [blame] | 23 | #include <linux/usb/serial.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | struct usbcons_info { |
| 26 | int magic; |
| 27 | int break_flag; |
| 28 | struct usb_serial_port *port; |
| 29 | }; |
| 30 | |
| 31 | static struct usbcons_info usbcons_info; |
| 32 | static struct console usbcons; |
| 33 | |
| 34 | /* |
| 35 | * ------------------------------------------------------------ |
| 36 | * USB Serial console driver |
| 37 | * |
| 38 | * Much of the code here is copied from drivers/char/serial.c |
| 39 | * and implements a phony serial console in the same way that |
| 40 | * serial.c does so that in case some software queries it, |
| 41 | * it will get the same results. |
| 42 | * |
| 43 | * Things that are different from the way the serial port code |
| 44 | * does things, is that we call the lower level usb-serial |
| 45 | * driver code to initialize the device, and we set the initial |
| 46 | * console speeds based on the command line arguments. |
| 47 | * ------------------------------------------------------------ |
| 48 | */ |
| 49 | |
Johan Hovold | 32a4bf2 | 2015-01-05 16:04:13 +0100 | [diff] [blame] | 50 | static const struct tty_operations usb_console_fake_tty_ops = { |
| 51 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | /* |
| 54 | * The parsing of the command line works exactly like the |
| 55 | * serial.c code, except that the specifier is "ttyUSB" instead |
| 56 | * of "ttyS". |
| 57 | */ |
Paul Fulghum | 69a4bf7 | 2006-04-12 23:41:59 +0200 | [diff] [blame] | 58 | static int usb_console_setup(struct console *co, char *options) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | struct usbcons_info *info = &usbcons_info; |
| 61 | int baud = 9600; |
| 62 | int bits = 8; |
| 63 | int parity = 'n'; |
| 64 | int doflow = 0; |
| 65 | int cflag = CREAD | HUPCL | CLOCAL; |
| 66 | char *s; |
| 67 | struct usb_serial *serial; |
| 68 | struct usb_serial_port *port; |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 69 | int retval; |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 70 | struct tty_struct *tty = NULL; |
Jason Wessel | 92d2c5e | 2010-03-16 16:05:44 -0500 | [diff] [blame] | 71 | struct ktermios dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | if (options) { |
| 74 | baud = simple_strtoul(options, NULL, 10); |
| 75 | s = options; |
| 76 | while (*s >= '0' && *s <= '9') |
| 77 | s++; |
| 78 | if (*s) |
| 79 | parity = *s++; |
| 80 | if (*s) |
| 81 | bits = *s++ - '0'; |
| 82 | if (*s) |
| 83 | doflow = (*s++ == 'r'); |
| 84 | } |
Alan Cox | c17ee88 | 2008-07-22 11:10:08 +0100 | [diff] [blame] | 85 | |
| 86 | /* Sane default */ |
| 87 | if (baud == 0) |
| 88 | baud = 9600; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | switch (bits) { |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 91 | case 7: |
| 92 | cflag |= CS7; |
| 93 | break; |
| 94 | default: |
| 95 | case 8: |
| 96 | cflag |= CS8; |
| 97 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | switch (parity) { |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 100 | case 'o': case 'O': |
| 101 | cflag |= PARODD; |
| 102 | break; |
| 103 | case 'e': case 'E': |
| 104 | cflag |= PARENB; |
| 105 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | co->cflag = cflag; |
| 108 | |
Aristeu Rozanski | 27680d2 | 2007-11-12 15:14:49 -0500 | [diff] [blame] | 109 | /* |
| 110 | * no need to check the index here: if the index is wrong, console |
| 111 | * code won't call us |
| 112 | */ |
Greg Kroah-Hartman | e5b1e20 | 2013-06-07 11:04:28 -0700 | [diff] [blame] | 113 | port = usb_serial_port_get_by_minor(co->index); |
| 114 | if (port == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* no device is connected yet, sorry :( */ |
Greg Kroah-Hartman | 92931d2 | 2012-09-13 16:30:31 -0700 | [diff] [blame] | 116 | pr_err("No USB device connected to ttyUSB%i\n", co->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | return -ENODEV; |
| 118 | } |
Greg Kroah-Hartman | e5b1e20 | 2013-06-07 11:04:28 -0700 | [diff] [blame] | 119 | serial = port->serial; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 121 | retval = usb_autopm_get_interface(serial->interface); |
| 122 | if (retval) |
| 123 | goto error_get_interface; |
| 124 | |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 125 | tty_port_tty_set(&port->port, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | info->port = port; |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 128 | |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 129 | ++port->port.count; |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 130 | if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) { |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 131 | if (serial->type->set_termios) { |
| 132 | /* |
| 133 | * allocate a fake tty so the driver can initialize |
| 134 | * the termios structure, then later call set_termios to |
| 135 | * configure according to command line arguments |
| 136 | */ |
| 137 | tty = kzalloc(sizeof(*tty), GFP_KERNEL); |
| 138 | if (!tty) { |
| 139 | retval = -ENOMEM; |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 140 | goto reset_open_count; |
| 141 | } |
Kevin Hao | e540458 | 2008-12-01 11:36:16 +0000 | [diff] [blame] | 142 | kref_init(&tty->kref); |
Jason Wessel | 92d2c5e | 2010-03-16 16:05:44 -0500 | [diff] [blame] | 143 | tty->driver = usb_serial_tty_driver; |
| 144 | tty->index = co->index; |
Johan Hovold | d269d44 | 2015-01-05 16:04:12 +0100 | [diff] [blame] | 145 | init_ldsem(&tty->ldisc_sem); |
Johan Hovold | 32a4bf2 | 2015-01-05 16:04:13 +0100 | [diff] [blame] | 146 | INIT_LIST_HEAD(&tty->tty_files); |
| 147 | kref_get(&tty->driver->kref); |
Johan Hovold | 5ee0089 | 2015-02-16 13:17:33 +0700 | [diff] [blame] | 148 | __module_get(tty->driver->owner); |
Johan Hovold | 32a4bf2 | 2015-01-05 16:04:13 +0100 | [diff] [blame] | 149 | tty->ops = &usb_console_fake_tty_ops; |
Peter Hurley | a3123fd | 2016-01-09 21:13:48 -0800 | [diff] [blame] | 150 | tty_init_termios(tty); |
Johan Hovold | 32a4bf2 | 2015-01-05 16:04:13 +0100 | [diff] [blame] | 151 | tty_port_tty_set(&port->port, tty); |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 152 | } |
| 153 | |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 154 | /* only call the device specific open if this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * is the first time the port is opened */ |
Johan Hovold | c7b1347 | 2013-06-26 16:47:26 +0200 | [diff] [blame] | 156 | retval = serial->type->open(NULL, port); |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 157 | if (retval) { |
Greg Kroah-Hartman | 085fb96 | 2012-04-20 16:53:58 -0700 | [diff] [blame] | 158 | dev_err(&port->dev, "could not open USB console port\n"); |
Jason Wessel | 92d2c5e | 2010-03-16 16:05:44 -0500 | [diff] [blame] | 159 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 162 | if (serial->type->set_termios) { |
Stephen Rothwell | 2d8a100 | 2012-07-20 14:58:31 +1000 | [diff] [blame] | 163 | tty->termios.c_cflag = cflag; |
| 164 | tty_termios_encode_baud_rate(&tty->termios, baud, baud); |
Jason Wessel | 92d2c5e | 2010-03-16 16:05:44 -0500 | [diff] [blame] | 165 | memset(&dummy, 0, sizeof(struct ktermios)); |
Jason Wessel | 06dd881 | 2008-09-08 14:53:37 +0100 | [diff] [blame] | 166 | serial->type->set_termios(tty, port, &dummy); |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 167 | |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 168 | tty_port_tty_set(&port->port, NULL); |
Johan Hovold | 32a4bf2 | 2015-01-05 16:04:13 +0100 | [diff] [blame] | 169 | tty_kref_put(tty); |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 170 | } |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 171 | set_bit(ASYNCB_INITIALIZED, &port->port.flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
Jason Wessel | 6e40612 | 2009-06-22 11:32:20 -0500 | [diff] [blame] | 173 | /* Now that any required fake tty operations are completed restore |
| 174 | * the tty port count */ |
| 175 | --port->port.count; |
| 176 | /* The console is special in terms of closing the device so |
| 177 | * indicate this port is now acting as a system console. */ |
Jason Wessel | 336cee4 | 2010-03-08 21:50:11 -0600 | [diff] [blame] | 178 | port->port.console = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 180 | mutex_unlock(&serial->disc_mutex); |
Aristeu Rozanski | c87d6a4 | 2007-11-13 17:22:07 -0500 | [diff] [blame] | 181 | return retval; |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 182 | |
Jason Wessel | 92d2c5e | 2010-03-16 16:05:44 -0500 | [diff] [blame] | 183 | fail: |
Alan Cox | 4a90f09 | 2008-10-13 10:39:46 +0100 | [diff] [blame] | 184 | tty_port_tty_set(&port->port, NULL); |
Johan Hovold | 32a4bf2 | 2015-01-05 16:04:13 +0100 | [diff] [blame] | 185 | tty_kref_put(tty); |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 186 | reset_open_count: |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 187 | port->port.count = 0; |
Alan Stern | 7bd032d | 2009-09-04 15:29:59 -0400 | [diff] [blame] | 188 | usb_autopm_put_interface(serial->interface); |
| 189 | error_get_interface: |
| 190 | usb_serial_put(serial); |
| 191 | mutex_unlock(&serial->disc_mutex); |
| 192 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 195 | static void usb_console_write(struct console *co, |
| 196 | const char *buf, unsigned count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
| 198 | static struct usbcons_info *info = &usbcons_info; |
| 199 | struct usb_serial_port *port = info->port; |
| 200 | struct usb_serial *serial; |
| 201 | int retval = -ENODEV; |
| 202 | |
Guennadi Liakhovetski | 73e487f | 2006-04-25 07:46:17 +0200 | [diff] [blame] | 203 | if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | return; |
| 205 | serial = port->serial; |
| 206 | |
| 207 | if (count == 0) |
| 208 | return; |
| 209 | |
Johan Hovold | 7b94cae | 2013-06-26 16:47:25 +0200 | [diff] [blame] | 210 | dev_dbg(&port->dev, "%s - %d byte(s)\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
Jason Wessel | bd5afa9 | 2010-03-08 21:50:12 -0600 | [diff] [blame] | 212 | if (!port->port.console) { |
Johan Hovold | 7b94cae | 2013-06-26 16:47:25 +0200 | [diff] [blame] | 213 | dev_dbg(&port->dev, "%s - port not opened\n", __func__); |
Paul Fulghum | c10746d | 2006-04-13 22:26:35 +0200 | [diff] [blame] | 214 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
Paul Fulghum | c10746d | 2006-04-13 22:26:35 +0200 | [diff] [blame] | 217 | while (count) { |
| 218 | unsigned int i; |
| 219 | unsigned int lf; |
| 220 | /* search for LF so we can insert CR if necessary */ |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 221 | for (i = 0, lf = 0 ; i < count ; i++) { |
Paul Fulghum | c10746d | 2006-04-13 22:26:35 +0200 | [diff] [blame] | 222 | if (*(buf + i) == 10) { |
| 223 | lf = 1; |
| 224 | i++; |
| 225 | break; |
| 226 | } |
| 227 | } |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 228 | /* pass on to the driver specific version of this function if |
| 229 | it is available */ |
Johan Hovold | c7b1347 | 2013-06-26 16:47:26 +0200 | [diff] [blame] | 230 | retval = serial->type->write(NULL, port, buf, i); |
Johan Hovold | 7b94cae | 2013-06-26 16:47:25 +0200 | [diff] [blame] | 231 | dev_dbg(&port->dev, "%s - write: %d\n", __func__, retval); |
Paul Fulghum | c10746d | 2006-04-13 22:26:35 +0200 | [diff] [blame] | 232 | if (lf) { |
| 233 | /* append CR after LF */ |
| 234 | unsigned char cr = 13; |
Johan Hovold | c7b1347 | 2013-06-26 16:47:26 +0200 | [diff] [blame] | 235 | retval = serial->type->write(NULL, port, &cr, 1); |
Johan Hovold | 7b94cae | 2013-06-26 16:47:25 +0200 | [diff] [blame] | 236 | dev_dbg(&port->dev, "%s - write cr: %d\n", |
| 237 | __func__, retval); |
Paul Fulghum | c10746d | 2006-04-13 22:26:35 +0200 | [diff] [blame] | 238 | } |
| 239 | buf += i; |
| 240 | count -= i; |
| 241 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
Kevin Hao | 39efd19 | 2009-01-02 13:44:34 +0000 | [diff] [blame] | 244 | static struct tty_driver *usb_console_device(struct console *co, int *index) |
| 245 | { |
| 246 | struct tty_driver **p = (struct tty_driver **)co->data; |
| 247 | |
| 248 | if (!*p) |
| 249 | return NULL; |
| 250 | |
| 251 | *index = co->index; |
| 252 | return *p; |
| 253 | } |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | static struct console usbcons = { |
| 256 | .name = "ttyUSB", |
| 257 | .write = usb_console_write, |
Kevin Hao | 39efd19 | 2009-01-02 13:44:34 +0000 | [diff] [blame] | 258 | .device = usb_console_device, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | .setup = usb_console_setup, |
| 260 | .flags = CON_PRINTBUFFER, |
| 261 | .index = -1, |
Kevin Hao | 39efd19 | 2009-01-02 13:44:34 +0000 | [diff] [blame] | 262 | .data = &usb_serial_tty_driver, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | }; |
| 264 | |
Guennadi Liakhovetski | 73e487f | 2006-04-25 07:46:17 +0200 | [diff] [blame] | 265 | void usb_serial_console_disconnect(struct usb_serial *serial) |
| 266 | { |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 267 | if (serial && serial->port && serial->port[0] |
| 268 | && serial->port[0] == usbcons_info.port) { |
Guennadi Liakhovetski | 73e487f | 2006-04-25 07:46:17 +0200 | [diff] [blame] | 269 | usb_serial_console_exit(); |
| 270 | usb_serial_put(serial); |
| 271 | } |
| 272 | } |
| 273 | |
Greg Kroah-Hartman | 3033bc8 | 2012-09-18 16:05:17 +0100 | [diff] [blame] | 274 | void usb_serial_console_init(int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | if (minor == 0) { |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 277 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | * Call register_console() if this is the first device plugged |
| 279 | * in. If we call it earlier, then the callback to |
| 280 | * console_setup() will fail, as there is not a device seen by |
| 281 | * the USB subsystem yet. |
| 282 | */ |
| 283 | /* |
| 284 | * Register console. |
| 285 | * NOTES: |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 286 | * console_setup() is called (back) immediately (from |
| 287 | * register_console). console_write() is called immediately |
| 288 | * from register_console iff CON_PRINTBUFFER is set in flags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | */ |
Greg Kroah-Hartman | 92931d2 | 2012-09-13 16:30:31 -0700 | [diff] [blame] | 290 | pr_debug("registering the USB serial console.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | register_console(&usbcons); |
| 292 | } |
| 293 | } |
| 294 | |
Alan Cox | 4dbd5a0 | 2008-07-22 11:09:57 +0100 | [diff] [blame] | 295 | void usb_serial_console_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
Guennadi Liakhovetski | 73e487f | 2006-04-25 07:46:17 +0200 | [diff] [blame] | 297 | if (usbcons_info.port) { |
| 298 | unregister_console(&usbcons); |
Jason Wessel | bd5afa9 | 2010-03-08 21:50:12 -0600 | [diff] [blame] | 299 | usbcons_info.port->port.console = 0; |
Guennadi Liakhovetski | 73e487f | 2006-04-25 07:46:17 +0200 | [diff] [blame] | 300 | usbcons_info.port = NULL; |
| 301 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
| 303 | |