diff options
Diffstat (limited to 'drivers/staging/dgrp/dgrp_common.c')
| -rw-r--r-- | drivers/staging/dgrp/dgrp_common.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/drivers/staging/dgrp/dgrp_common.c b/drivers/staging/dgrp/dgrp_common.c deleted file mode 100644 index 9a9b456..0000000 --- a/drivers/staging/dgrp/dgrp_common.c +++ /dev/null @@ -1,169 +0,0 @@ -/* - * - * Copyright 1999 Digi International (www.digi.com) - * James Puzzo <jamesp at digi dot com> - * - * 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, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the - * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR - * PURPOSE. See the GNU General Public License for more details. - * - */ - -/* - * - * Filename: - * - * dgrp_common.c - * - * Description: - * - * Definitions of global variables and functions which are either - * shared by the tty, mon, and net drivers; or which cross them - * functionally (like the poller). - * - * Author: - * - * James A. Puzzo - * - */ - -#include <linux/errno.h> -#include <linux/tty.h> -#include <linux/sched.h> -#include <linux/cred.h> - -#include "dgrp_common.h" - -/** - * dgrp_carrier -- check for carrier change state and act - * @ch: struct ch_struct * - */ -void dgrp_carrier(struct ch_struct *ch) -{ - struct nd_struct *nd; - - int virt_carrier = 0; - int phys_carrier = 0; - - /* fix case when the tty has already closed. */ - - if (!ch) - return; - nd = ch->ch_nd; - if (!nd) - return; - - /* - * If we are currently waiting to determine the status of the port, - * we don't yet know the state of the modem lines. As a result, - * we ignore state changes when we are waiting for the modem lines - * to be established. We know, as a result of code in dgrp_net_ops, - * that we will be called again immediately following the reception - * of the status message with the true modem status flags in it. - */ - if (ch->ch_expect & RR_STATUS) - return; - - /* - * If CH_HANGUP is set, we gotta keep trying to get all the processes - * that have the port open to close the port. - * So lets just keep sending a hangup every time we get here. - */ - if ((ch->ch_flag & CH_HANGUP) && - (ch->ch_tun.un_open_count > 0)) - tty_hangup(ch->ch_tun.un_tty); - - /* - * Compute the effective state of both the physical and virtual - * senses of carrier. - */ - - if (ch->ch_s_mlast & DM_CD) - phys_carrier = 1; - - if ((ch->ch_s_mlast & DM_CD) || - (ch->ch_digi.digi_flags & DIGI_FORCEDCD) || - (ch->ch_flag & CH_CLOCAL)) - virt_carrier = 1; - - /* - * Test for a VIRTUAL carrier transition to HIGH. - * - * The CH_HANGUP condition is intended to prevent any action - * except for close. As a result, we ignore positive carrier - * transitions during CH_HANGUP. - */ - if (((ch->ch_flag & CH_HANGUP) == 0) && - ((ch->ch_flag & CH_VIRT_CD) == 0) && - (virt_carrier == 1)) { - /* - * When carrier rises, wake any threads waiting - * for carrier in the open routine. - */ - nd->nd_tx_work = 1; - - if (waitqueue_active(&ch->ch_flag_wait)) - wake_up_interruptible(&ch->ch_flag_wait); - } - - /* - * Test for a PHYSICAL transition to low, so long as we aren't - * currently ignoring physical transitions (which is what "virtual - * carrier" indicates). - * - * The transition of the virtual carrier to low really doesn't - * matter... it really only means "ignore carrier state", not - * "make pretend that carrier is there". - */ - if ((virt_carrier == 0) && - ((ch->ch_flag & CH_PHYS_CD) != 0) && - (phys_carrier == 0)) { - /* - * When carrier drops: - * - * Do a Hard Hangup if that is called for. - * - * Drop carrier on all open units. - * - * Flush queues, waking up any task waiting in the - * line discipline. - * - * Send a hangup to the control terminal. - * - * Enable all select calls. - */ - - nd->nd_tx_work = 1; - - ch->ch_flag &= ~(CH_LOW | CH_EMPTY | CH_DRAIN | CH_INPUT); - - if (waitqueue_active(&ch->ch_flag_wait)) - wake_up_interruptible(&ch->ch_flag_wait); - - if (ch->ch_tun.un_open_count > 0) - tty_hangup(ch->ch_tun.un_tty); - - if (ch->ch_pun.un_open_count > 0) - tty_hangup(ch->ch_pun.un_tty); - } - - /* - * Make sure that our cached values reflect the current reality. - */ - if (virt_carrier == 1) - ch->ch_flag |= CH_VIRT_CD; - else - ch->ch_flag &= ~CH_VIRT_CD; - - if (phys_carrier == 1) - ch->ch_flag |= CH_PHYS_CD; - else - ch->ch_flag &= ~CH_PHYS_CD; - -} |