void gs_close(struct tty_struct * tty, struct file * filp) { unsigned long flags; struct gs_port *port; func_enter (); if (!tty) return; port = (struct gs_port *) tty->driver_data; if (!port) return; if (!port->tty) { /* This seems to happen when this is called from vhangup. */ gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->tty is NULL\n"); port->tty = tty; } spin_lock_irqsave(&port->driver_lock, flags); if (tty_hung_up_p(filp)) { spin_unlock_irqrestore(&port->driver_lock, flags); if (port->rd->hungup) port->rd->hungup (port); func_exit (); return; } if ((tty->count == 1) && (port->count != 1)) { printk(KERN_ERR "gs: gs_close port %p: bad port count;" " tty->count is 1, port count is %d\n", port, port->count); port->count = 1; } if (--port->count < 0) { printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->count); port->count = 0; } if (port->count) { gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->count); spin_unlock_irqrestore(&port->driver_lock, flags); func_exit (); return; } port->flags |= ASYNC_CLOSING; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, port->closing_wait); */ /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ port->rd->disable_rx_interrupts (port); spin_unlock_irqrestore(&port->driver_lock, flags); /* close has no way of returning "EINTR", so discard return value */ if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) gs_wait_tx_flushed (port, port->closing_wait); port->flags &= ~GS_ACTIVE; if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); tty_ldisc_flush(tty); tty->closing = 0; port->event = 0; port->rd->close (port); port->rd->shutdown_port (port); port->tty = NULL; if (port->blocked_open) { if (port->close_delay) { spin_unlock_irqrestore(&port->driver_lock, flags); msleep_interruptible(jiffies_to_msecs(port->close_delay)); spin_lock_irqsave(&port->driver_lock, flags); } wake_up_interruptible(&port->open_wait); } port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); wake_up_interruptible(&port->close_wait); func_exit (); }
void gs_set_termios (struct tty_struct * tty, struct ktermios * old_termios) { struct gs_port *port; int baudrate, tmp, rv; struct ktermios *tiosp; func_enter(); if (!tty) return; port = tty->driver_data; if (!port) return; if (!port->tty) { /* This seems to happen when this is called after gs_close. */ gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->tty is NULL\n"); port->tty = tty; } tiosp = tty->termios; if (gs_debug & GS_DEBUG_TERMIOS) { gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); } /* This is an optimization that is only allowed for dumb cards */ /* Smart cards require knowledge of iflags and oflags too: that might change hardware cooking mode.... */ if (old_termios) { if( (tiosp->c_iflag == old_termios->c_iflag) && (tiosp->c_oflag == old_termios->c_oflag) && (tiosp->c_cflag == old_termios->c_cflag) && (tiosp->c_lflag == old_termios->c_lflag) && (tiosp->c_line == old_termios->c_line) && (memcmp(tiosp->c_cc, old_termios->c_cc, NCC) == 0)) { gs_dprintk(GS_DEBUG_TERMIOS, "gs_set_termios: optimized away\n"); return /* 0 */; } } else gs_dprintk(GS_DEBUG_TERMIOS, "gs_set_termios: no old_termios: " "no optimization\n"); if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); } baudrate = tty_get_baud_rate(tty); if ((tiosp->c_cflag & CBAUD) == B38400) { if ( (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) baudrate = 57600; else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) baudrate = 115200; else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) baudrate = 230400; else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) baudrate = 460800; else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) baudrate = (port->baud_base / port->custom_divisor); } /* I recommend using THIS instead of the mess in termios (and duplicating the above code). Next we should create a clean interface towards this variable. If your card supports arbitrary baud rates, (e.g. CD1400 or 16550 based cards) then everything will be very easy..... */ port->baud = baudrate; /* Two timer ticks seems enough to wakeup something like SLIP driver */ /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ tmp = (baudrate / 10 / HZ) * 2; if (tmp < 0) tmp = 0; if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; port->wakeup_chars = tmp; /* We should really wait for the characters to be all sent before changing the settings. -- CAL */ rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); if (rv < 0) return /* rv */; rv = port->rd->set_real_termios(port); if (rv < 0) return /* rv */; if ((!old_termios || (old_termios->c_cflag & CRTSCTS)) && !( tiosp->c_cflag & CRTSCTS)) { tty->stopped = 0; gs_start(tty); } #ifdef tytso_patch_94Nov25_1726 /* This "makes sense", Why is it commented out? */ if (!(old_termios->c_cflag & CLOCAL) && (tty->termios->c_cflag & CLOCAL)) wake_up_interruptible(&port->gs.open_wait); #endif func_exit(); return /* 0 */; }
void gs_close(struct tty_struct * tty, struct file * filp) { unsigned long flags; struct gs_port *port; func_enter (); if (!tty) return; port = (struct gs_port *) tty->driver_data; if (!port) return; if (!port->tty) { /* This seems to happen when this is called from vhangup. */ gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->tty is NULL\n"); port->tty = tty; } save_flags(flags); cli(); if (tty_hung_up_p(filp)) { restore_flags(flags); port->rd->hungup (port); func_exit (); return; } if ((tty->count == 1) && (port->count != 1)) { printk(KERN_ERR "gs: gs_close: bad port count;" " tty->count is 1, port count is %d\n", port->count); port->count = 1; } if (--port->count < 0) { printk(KERN_ERR "gs: gs_close: bad port count: %d\n", port->count); port->count = 0; } if (port->count) { gs_dprintk(GS_DEBUG_CLOSE, "gs_close: count: %d\n", port->count); restore_flags(flags); func_exit (); return; } port->flags |= ASYNC_CLOSING; /* * Save the termios structure, since this port may have * separate termios for callout and dialin. */ if (port->flags & ASYNC_NORMAL_ACTIVE) port->normal_termios = *tty->termios; if (port->flags & ASYNC_CALLOUT_ACTIVE) port->callout_termios = *tty->termios; /* * Now we wait for the transmit buffer to clear; and we notify * the line discipline to only process XON/XOFF characters. */ tty->closing = 1; /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) tty_wait_until_sent(tty, port->closing_wait); */ /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the * line status register. */ port->rd->disable_rx_interrupts (port); /* close has no way of returning "EINTR", so discard return value */ if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) gs_wait_tx_flushed (port, port->closing_wait); port->flags &= ~GS_ACTIVE; if (tty->driver.flush_buffer) tty->driver.flush_buffer(tty); if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); tty->closing = 0; port->event = 0; port->rd->close (port); port->rd->shutdown_port (port); port->tty = 0; if (port->blocked_open) { if (port->close_delay) { set_current_state (TASK_INTERRUPTIBLE); schedule_timeout(port->close_delay); } wake_up_interruptible(&port->open_wait); } port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE| ASYNC_CLOSING | ASYNC_INITIALIZED); wake_up_interruptible(&port->close_wait); restore_flags(flags); func_exit (); }