Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750772AbVLKSYw (ORCPT ); Sun, 11 Dec 2005 13:24:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750773AbVLKSYw (ORCPT ); Sun, 11 Dec 2005 13:24:52 -0500 Received: from mail.gmx.de ([213.165.64.21]:46517 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S1750772AbVLKSYv (ORCPT ); Sun, 11 Dec 2005 13:24:51 -0500 X-Authenticated: #20799612 Date: Sun, 11 Dec 2005 19:20:38 +0100 From: Hansjoerg Lipp To: Karsten Keil Cc: i4ldeveloper@listserv.isdn4linux.de, linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Tilman Schmidt Subject: [PATCH 5/9] isdn4linux: Siemens Gigaset drivers - tty interface Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.9i X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 20629 Lines: 779 From: Tilman Schmidt , Hansjoerg Lipp This patch adds the tty interface to the gigaset module. The tty interface provides direct access to the AT command set of the Gigaset devices. Signed-off-by: Hansjoerg Lipp Signed-off-by: Tilman Schmidt --- drivers/isdn/gigaset/interface.c | 722 +++++++++++++++++++++++++++++++++++++++ include/linux/gigaset_dev.h | 32 + 2 files changed, 754 insertions(+) --- linux-2.6.14/include/linux/gigaset_dev.h 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.14-gig/include/linux/gigaset_dev.h 2005-11-21 23:27:54.000000000 +0100 @@ -0,0 +1,32 @@ +/* + * interface to user space for the gigaset driver + * + * Copyright (c) 2004 by Hansjoerg Lipp + * + * ===================================================================== + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * ===================================================================== + * Version: $Id: gigaset_dev.h,v 1.4.4.4 2005/11/21 22:28:09 hjlipp Exp $ + * ===================================================================== + */ + +#ifndef GIGASET_INTERFACE_H +#define GIGASET_INTERFACE_H + +#include + +#define GIGASET_IOCTL 0x47 + +#define GIGVER_DRIVER 0 +#define GIGVER_COMPAT 1 +#define GIGVER_FWBASE 2 + +#define GIGASET_REDIR _IOWR (GIGASET_IOCTL, 0, int) +#define GIGASET_CONFIG _IOWR (GIGASET_IOCTL, 1, int) +#define GIGASET_BRKCHARS _IOW (GIGASET_IOCTL, 2, unsigned char[6]) //FIXME [6] okay? +#define GIGASET_VERSION _IOWR (GIGASET_IOCTL, 3, unsigned[4]) + +#endif --- linux-2.6.14/drivers/isdn/gigaset/interface.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.14-gig/drivers/isdn/gigaset/interface.c 2005-12-11 13:21:42.000000000 +0100 @@ -0,0 +1,722 @@ +/* + * interface to user space for the gigaset driver + * + * Copyright (c) 2004 by Hansjoerg Lipp + * + * ===================================================================== + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * ===================================================================== + * Version: $Id: interface.c,v 1.14.4.12 2005/11/27 15:23:59 hjlipp Exp $ + * ===================================================================== + */ + +#include "gigaset.h" +#include +#include +#include + +/*** our ioctls ***/ + +static int if_lock(struct cardstate *cs, int *arg) +{ + int cmd = *arg; + + dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd); + + if (cmd > 1) + return -EINVAL; + + if (cmd < 0) { + *arg = atomic_read(&cs->mstate) == MS_LOCKED; //FIXME remove? + return 0; + } + + if (!cmd && atomic_read(&cs->mstate) == MS_LOCKED && atomic_read(&cs->connected)) { + cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS); + cs->ops->baud_rate(cs, B115200); + cs->ops->set_line_ctrl(cs, CS8); + cs->control_state = TIOCM_DTR|TIOCM_RTS; + } + + cs->waiting = 1; + if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK, + NULL, cmd, NULL)) { + cs->waiting = 0; + return -ENOMEM; + } + + dbg(DEBUG_CMD, "scheduling IF_LOCK"); + gigaset_schedule_event(cs); + + wait_event(cs->waitqueue, !cs->waiting); + + if (cs->cmd_result >= 0) { + *arg = cs->cmd_result; + return 0; + } + + return cs->cmd_result; +} + +static int if_version(struct cardstate *cs, unsigned arg[4]) +{ + static const unsigned version[4] = GIG_VERSION; + static const unsigned compat[4] = GIG_COMPAT; + unsigned cmd = arg[0]; + + dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd); + + switch (cmd) { + case GIGVER_DRIVER: + memcpy(arg, version, sizeof version); + return 0; + case GIGVER_COMPAT: + memcpy(arg, compat, sizeof compat); + return 0; + case GIGVER_FWBASE: + cs->waiting = 1; + if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER, + NULL, 0, arg)) { + cs->waiting = 0; + return -ENOMEM; + } + + dbg(DEBUG_CMD, "scheduling IF_VER"); + gigaset_schedule_event(cs); + + wait_event(cs->waitqueue, !cs->waiting); + + if (cs->cmd_result >= 0) + return 0; + + return cs->cmd_result; + default: + return -EINVAL; + } +} + +static int if_config(struct cardstate *cs, int *arg) +{ + dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg); + + if (*arg != 1) + return -EINVAL; + + if (atomic_read(&cs->mstate) != MS_LOCKED) + return -EBUSY; + + *arg = 0; + return gigaset_enterconfigmode(cs); +} + +/*** the terminal driver ***/ +/* stolen from usbserial and some other tty drivers */ + +static int if_open(struct tty_struct *tty, struct file *filp); +static void if_close(struct tty_struct *tty, struct file *filp); +static int if_ioctl(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg); +static int if_write_room(struct tty_struct *tty); +static int if_chars_in_buffer(struct tty_struct *tty); +static void if_throttle(struct tty_struct *tty); +static void if_unthrottle(struct tty_struct *tty); +static void if_set_termios(struct tty_struct *tty, struct termios *old); +static int if_tiocmget(struct tty_struct *tty, struct file *file); +static int if_tiocmset(struct tty_struct *tty, struct file *file, + unsigned int set, unsigned int clear); +static int if_write(struct tty_struct *tty, + const unsigned char *buf, int count); + +static struct tty_operations if_ops = { + .open = if_open, + .close = if_close, + .ioctl = if_ioctl, + .write = if_write, + .write_room = if_write_room, + .chars_in_buffer = if_chars_in_buffer, + .set_termios = if_set_termios, + .throttle = if_throttle, + .unthrottle = if_unthrottle, +#if 0 + .break_ctl = serial_break, +#endif + .tiocmget = if_tiocmget, + .tiocmset = if_tiocmset, +}; + +static int if_open(struct tty_struct *tty, struct file *filp) +{ + struct cardstate *cs; + unsigned long flags; + + dbg(DEBUG_IF, "%d+%d: %s()", tty->driver->minor_start, tty->index, + __FUNCTION__); + + tty->driver_data = NULL; + + cs = gigaset_get_cs_by_tty(tty); + if (!cs) + return -ENODEV; + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + tty->driver_data = cs; + + ++cs->open_count; + + if (cs->open_count == 1) { + spin_lock_irqsave(&cs->lock, flags); + cs->tty = tty; + spin_unlock_irqrestore(&cs->lock, flags); + tty->low_latency = 1; //FIXME test + //FIXME + } + + up(&cs->sem); + return 0; +} + +static void if_close(struct tty_struct *tty, struct file *filp) +{ + struct cardstate *cs; + unsigned long flags; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + down(&cs->sem); + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else { + if (!--cs->open_count) { + spin_lock_irqsave(&cs->lock, flags); + cs->tty = NULL; + spin_unlock_irqrestore(&cs->lock, flags); + //FIXME + } + } + + up(&cs->sem); +} + +static int if_ioctl(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct cardstate *cs; + int retval = -ENODEV; + int int_arg; + unsigned char buf[6]; + unsigned version[4]; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return -ENODEV; + } + + dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __FUNCTION__, cmd); + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else { + retval = 0; + switch (cmd) { + case GIGASET_REDIR: + retval = get_user(int_arg, (int __user *) arg); + if (retval >= 0) + retval = if_lock(cs, &int_arg); + if (retval >= 0) + retval = put_user(int_arg, (int __user *) arg); + break; + case GIGASET_CONFIG: + retval = get_user(int_arg, (int __user *) arg); + if (retval >= 0) + retval = if_config(cs, &int_arg); + if (retval >= 0) + retval = put_user(int_arg, (int __user *) arg); + break; + case GIGASET_BRKCHARS: + //FIXME test if MS_LOCKED + gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS", + 6, (const unsigned char *) arg, 1); + if (!atomic_read(&cs->connected)) { + dbg(DEBUG_ANY, "can't communicate with unplugged device"); + retval = -ENODEV; + break; + } + retval = copy_from_user(&buf, + (const unsigned char __user *) arg, 6) + ? -EFAULT : 0; + if (retval >= 0) + retval = cs->ops->brkchars(cs, buf); + break; + case GIGASET_VERSION: + retval = copy_from_user(version, (unsigned __user *) arg, + sizeof version) ? -EFAULT : 0; + if (retval >= 0) + retval = if_version(cs, version); + if (retval >= 0) + retval = copy_to_user((unsigned __user *) arg, version, + sizeof version) + ? -EFAULT : 0; + break; + default: + dbg(DEBUG_ANY, "%s: arg not supported - 0x%04x", + __FUNCTION__, cmd); + retval = -ENOIOCTLCMD; + } + } + + up(&cs->sem); + + return retval; +} + +static int if_tiocmget(struct tty_struct *tty, struct file *file) +{ + struct cardstate *cs; + int retval; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return -ENODEV; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + + // FIXME read from device? + retval = cs->control_state & (TIOCM_RTS|TIOCM_DTR); + + up(&cs->sem); + + return retval; +} + +static int if_tiocmset(struct tty_struct *tty, struct file *file, + unsigned int set, unsigned int clear) +{ + struct cardstate *cs; + int retval; + unsigned mc; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return -ENODEV; + } + + dbg(DEBUG_IF, + "%u: %s(0x%x, 0x%x)", cs->minor_index, __FUNCTION__, set, clear); + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + + if (!atomic_read(&cs->connected)) { + dbg(DEBUG_ANY, "can't communicate with unplugged device"); + retval = -ENODEV; + } else { + mc = (cs->control_state | set) & ~clear & (TIOCM_RTS|TIOCM_DTR); + retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc); + cs->control_state = mc; + } + + up(&cs->sem); + + return retval; +} + +static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + struct cardstate *cs; + int retval = -ENODEV; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return -ENODEV; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else if (atomic_read(&cs->mstate) != MS_LOCKED) { + warn("can't write to unlocked device"); + retval = -EBUSY; + } else if (!atomic_read(&cs->connected)) { + dbg(DEBUG_ANY, "can't write to unplugged device"); + retval = -EBUSY; //FIXME + } else { + retval = cs->ops->write_cmd(cs, buf, count, + &cs->if_wake_tasklet); + } + + up(&cs->sem); + + return retval; +} + +static int if_write_room(struct tty_struct *tty) +{ + struct cardstate *cs; + int retval = -ENODEV; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return -ENODEV; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else if (atomic_read(&cs->mstate) != MS_LOCKED) { + warn("can't write to unlocked device"); + retval = -EBUSY; //FIXME + } else if (!atomic_read(&cs->connected)) { + dbg(DEBUG_ANY, "can't write to unplugged device"); + retval = -EBUSY; //FIXME + } else + retval = cs->ops->write_room(cs); + + up(&cs->sem); + + return retval; +} + +static int if_chars_in_buffer(struct tty_struct *tty) +{ + struct cardstate *cs; + int retval = -ENODEV; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return -ENODEV; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + if (down_interruptible(&cs->sem)) + return -ERESTARTSYS; // FIXME -EINTR? + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else if (atomic_read(&cs->mstate) != MS_LOCKED) { + warn("can't write to unlocked device"); + retval = -EBUSY; + } else if (!atomic_read(&cs->connected)) { + dbg(DEBUG_ANY, "can't write to unplugged device"); + retval = -EBUSY; //FIXME + } else + retval = cs->ops->chars_in_buffer(cs); + + up(&cs->sem); + + return retval; +} + +static void if_throttle(struct tty_struct *tty) +{ + struct cardstate *cs; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + down(&cs->sem); + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else { + //FIXME + } + + up(&cs->sem); +} + +static void if_unthrottle(struct tty_struct *tty) +{ + struct cardstate *cs; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + down(&cs->sem); + + if (!cs->open_count) + warn("%s: device not opened", __FUNCTION__); + else { + //FIXME + } + + up(&cs->sem); +} + +static void if_set_termios(struct tty_struct *tty, struct termios *old) +{ + struct cardstate *cs; + unsigned int iflag; + unsigned int cflag; + unsigned int old_cflag; + unsigned int control_state, new_state; + + cs = (struct cardstate *) tty->driver_data; + if (!cs) { + err("cs==NULL in %s", __FUNCTION__); + return; + } + + dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__); + + down(&cs->sem); + + if (!cs->open_count) { + warn("%s: device not opened", __FUNCTION__); + goto out; + } + + if (!atomic_read(&cs->connected)) { + dbg(DEBUG_ANY, "can't communicate with unplugged device"); + goto out; + } + + // stolen from mct_u232.c + iflag = tty->termios->c_iflag; + cflag = tty->termios->c_cflag; + old_cflag = old ? old->c_cflag : cflag; //FIXME? + dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x", cs->minor_index, + iflag, cflag, old_cflag); + + /* get a local copy of the current port settings */ + control_state = cs->control_state; + + /* + * Update baud rate. + * Do not attempt to cache old rates and skip settings, + * disconnects screw such tricks up completely. + * Premature optimization is the root of all evil. + */ + + /* reassert DTR and (maybe) RTS on transition from B0 */ + if ((old_cflag & CBAUD) == B0) { + new_state = control_state | TIOCM_DTR; + /* don't set RTS if using hardware flow control */ + if (!(old_cflag & CRTSCTS)) + new_state |= TIOCM_RTS; + dbg(DEBUG_IF, "%u: from B0 - set DTR%s", cs->minor_index, + (new_state & TIOCM_RTS) ? " only" : "/RTS"); + cs->ops->set_modem_ctrl(cs, control_state, new_state); + control_state = new_state; + } + + cs->ops->baud_rate(cs, cflag & CBAUD); + + if ((cflag & CBAUD) == B0) { + /* Drop RTS and DTR */ + dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index); + new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS); + cs->ops->set_modem_ctrl(cs, control_state, new_state); + control_state = new_state; + } + + /* + * Update line control register (LCR) + */ + + cs->ops->set_line_ctrl(cs, cflag); + +#if 0 + //FIXME this hangs M101 [ts 2005-03-09] + //FIXME do we need this? + /* + * Set flow control: well, I do not really now how to handle DTR/RTS. + * Just do what we have seen with SniffUSB on Win98. + */ + /* Drop DTR/RTS if no flow control otherwise assert */ + dbg(DEBUG_IF, "%u: control_state %x", cs->minor_index, control_state); + new_state = control_state; + if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS)) + new_state |= TIOCM_DTR | TIOCM_RTS; + else + new_state &= ~(TIOCM_DTR | TIOCM_RTS); + if (new_state != control_state) { + dbg(DEBUG_IF, "%u: new_state %x", cs->minor_index, new_state); + gigaset_set_modem_ctrl(cs, control_state, new_state); // FIXME: mct_u232.c sets the old state here. is this a bug? + control_state = new_state; + } +#endif + + /* save off the modified port settings */ + cs->control_state = control_state; + +out: + up(&cs->sem); +} + + +/* wakeup tasklet for the write operation */ +static void if_wake(unsigned long data) +{ + struct cardstate *cs = (struct cardstate *) data; + struct tty_struct *tty; + + tty = cs->tty; + if (!tty) + return; + + if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && + tty->ldisc.write_wakeup) { + dbg(DEBUG_IF, "write wakeup call"); + tty->ldisc.write_wakeup(tty); + } + + wake_up_interruptible(&tty->write_wait); +} + +/*** interface to common ***/ + +void gigaset_if_init(struct cardstate *cs) +{ + struct gigaset_driver *drv; + + drv = cs->driver; + if (!drv->have_tty) + return; + + tasklet_init(&cs->if_wake_tasklet, &if_wake, (unsigned long) cs); + tty_register_device(drv->tty, cs->minor_index, NULL); +} + +void gigaset_if_free(struct cardstate *cs) +{ + struct gigaset_driver *drv; + + drv = cs->driver; + if (!drv->have_tty) + return; + + tasklet_disable(&cs->if_wake_tasklet); + tasklet_kill(&cs->if_wake_tasklet); + tty_unregister_device(drv->tty, cs->minor_index); +} + +void gigaset_if_receive(struct cardstate *cs, + unsigned char *buffer, size_t len) +{ + size_t i; + unsigned long flags; + struct tty_struct *tty; + + spin_lock_irqsave(&cs->lock, flags); + if ((tty = cs->tty) == NULL) + dbg(DEBUG_ANY, "receive on closed device"); + else { + for (i = 0; i < len; ++i, ++buffer) { + if (tty->flip.count >= TTY_FLIPBUF_SIZE) + tty_flip_buffer_push(tty); + /* this doesn't actually push the data through unless tty->low_latency is set */ + tty_insert_flip_char(tty, *buffer, 0); + } + tty_flip_buffer_push(tty); + } + spin_unlock_irqrestore(&cs->lock, flags); +} +EXPORT_SYMBOL_GPL(gigaset_if_receive); + +/* gigaset_if_initdriver + * Initialize tty interface. + * parameters: + * drv Driver + * procname Name of the driver (e.g. for /proc/tty/drivers) + * devname Name of the device files (prefix without minor number) + * devfsname Devfs name of the device files without %d + */ +void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname, + const char *devname, const char *devfsname) +{ + unsigned minors = drv->minors; + int ret; + struct tty_driver *tty; + + drv->have_tty = 0; + + if ((drv->tty = alloc_tty_driver(minors)) == NULL) + goto enomem; + tty = drv->tty; + + tty->magic = TTY_DRIVER_MAGIC, + tty->major = GIG_MAJOR, + tty->type = TTY_DRIVER_TYPE_SERIAL, + tty->subtype = SERIAL_TYPE_NORMAL, + tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS, + + tty->driver_name = procname; + tty->name = devname; + tty->minor_start = drv->minor; + tty->num = drv->minors; + + tty->owner = drv->owner; + tty->devfs_name = devfsname; + + tty->init_termios = tty_std_termios; //FIXME + tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; //FIXME + tty_set_operations(tty, &if_ops); + + ret = tty_register_driver(tty); + if (ret < 0) { + warn("failed to register tty driver (error %d)", ret); + goto error; + } + dbg(DEBUG_IF, "tty driver initialized"); + drv->have_tty = 1; + return; + +enomem: + warn("could not allocate tty structures"); +error: + if (drv->tty) + put_tty_driver(drv->tty); +} + +void gigaset_if_freedriver(struct gigaset_driver *drv) +{ + if (!drv->have_tty) + return; + + drv->have_tty = 0; + tty_unregister_driver(drv->tty); + put_tty_driver(drv->tty); +} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/