115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
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/*
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* Copyright 2011 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Compatibility file for Linux wireless for kernels 2.6.39.
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*/
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#include <linux/compat.h>
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#include <linux/tty.h>
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#include <linux/sched.h>
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
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/*
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* Termios Helper Methods
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*/
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static void unset_locked_termios(struct ktermios *termios,
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struct ktermios *old,
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struct ktermios *locked)
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{
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int i;
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#define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z)))
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if (!locked) {
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printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
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return;
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}
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NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
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NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
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NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
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NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
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termios->c_line = locked->c_line ? old->c_line : termios->c_line;
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for (i = 0; i < NCCS; i++)
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termios->c_cc[i] = locked->c_cc[i] ?
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old->c_cc[i] : termios->c_cc[i];
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/* FIXME: What should we do for i/ospeed */
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}
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/**
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* tty_set_termios - update termios values
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* @tty: tty to update
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* @new_termios: desired new value
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*
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* Perform updates to the termios values set on this terminal. There
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* is a bit of layering violation here with n_tty in terms of the
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* internal knowledge of this function.
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*
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* Locking: termios_mutex
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*/
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int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
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{
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struct ktermios old_termios;
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struct tty_ldisc *ld;
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unsigned long flags;
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/*
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* Perform the actual termios internal changes under lock.
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*/
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/* FIXME: we need to decide on some locking/ordering semantics
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for the set_termios notification eventually */
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mutex_lock(&tty->termios_mutex);
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old_termios = *tty->termios;
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*tty->termios = *new_termios;
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unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
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/* See if packet mode change of state. */
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if (tty->link && tty->link->packet) {
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int extproc = (old_termios.c_lflag & EXTPROC) |
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(tty->termios->c_lflag & EXTPROC);
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int old_flow = ((old_termios.c_iflag & IXON) &&
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(old_termios.c_cc[VSTOP] == '\023') &&
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(old_termios.c_cc[VSTART] == '\021'));
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int new_flow = (I_IXON(tty) &&
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STOP_CHAR(tty) == '\023' &&
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START_CHAR(tty) == '\021');
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if ((old_flow != new_flow) || extproc) {
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spin_lock_irqsave(&tty->ctrl_lock, flags);
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if (old_flow != new_flow) {
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tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
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if (new_flow)
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tty->ctrl_status |= TIOCPKT_DOSTOP;
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else
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tty->ctrl_status |= TIOCPKT_NOSTOP;
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}
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if (extproc)
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tty->ctrl_status |= TIOCPKT_IOCTL;
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spin_unlock_irqrestore(&tty->ctrl_lock, flags);
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wake_up_interruptible(&tty->link->read_wait);
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}
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}
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if (tty->ops->set_termios)
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(*tty->ops->set_termios)(tty, &old_termios);
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else
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tty_termios_copy_hw(tty->termios, &old_termios);
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ld = tty_ldisc_ref(tty);
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if (ld != NULL) {
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if (ld->ops->set_termios)
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(ld->ops->set_termios)(tty, &old_termios);
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tty_ldisc_deref(ld);
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}
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mutex_unlock(&tty->termios_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(tty_set_termios);
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#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)) */
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