void gs_close(struct tty_struct * tty, struct file * filp) { unsigned long flags; struct gs_port *port; func_enter (); port = tty->driver_data; if (!port) return; if (!port->port.tty) { /* This seems to happen when this is called from vhangup. */ gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); port->port.tty = tty; } spin_lock_irqsave(&port->port.lock, flags); if (tty_hung_up_p(filp)) { spin_unlock_irqrestore(&port->port.lock, flags); if (port->rd->hungup) port->rd->hungup (port); func_exit (); return; } if ((tty->count == 1) && (port->port.count != 1)) { ; " tty->count is 1, port count is %d\n", port, port->port.count); port->port.count = 1; }
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; } 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 (); }
int gs_block_til_ready(void *port_, struct file * filp) { struct gs_port *port = port_; DECLARE_WAITQUEUE(wait, current); int retval; int do_clocal = 0; int CD; struct tty_struct *tty; unsigned long flags; func_enter (); if (!port) return 0; tty = port->tty; if (!tty) return 0; gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); /* * If the device is in the middle of being closed, then block * until it's done, and then try again. */ if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { interruptible_sleep_on(&port->close_wait); if (port->flags & ASYNC_HUP_NOTIFY) return -EAGAIN; else return -ERESTARTSYS; } gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); /* * If non-blocking mode is set, or the port is not enabled, * then make the check up front and then exit. */ if ((tx_cache_get_file_ro(filp)->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { port->flags |= ASYNC_NORMAL_ACTIVE; return 0; } gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); if (C_CLOCAL(tty)) do_clocal = 1; /* * Block waiting for the carrier detect and the line to become * free (i.e., not in use by the callout). While we are in * this loop, port->count is dropped by one, so that * rs_close() knows when to free things. We restore it upon * exit, either normal or abnormal. */ retval = 0; add_wait_queue(&port->open_wait, &wait); gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); spin_lock_irqsave(&port->driver_lock, flags); if (!tty_hung_up_p(filp)) { port->count--; } spin_unlock_irqrestore(&port->driver_lock, flags); port->blocked_open++; while (1) { CD = port->rd->get_CD (port); gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); set_current_state (TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { if (port->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; break; } if (!(port->flags & ASYNC_CLOSING) && (do_clocal || CD)) break; gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", (int)signal_pending (current), *(long*)(¤t->blocked)); if (signal_pending(current)) { retval = -ERESTARTSYS; break; } schedule(); } gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", port->blocked_open); set_current_state (TASK_RUNNING); remove_wait_queue(&port->open_wait, &wait); if (!tty_hung_up_p(filp)) { port->count++; } port->blocked_open--; if (retval) return retval; port->flags |= ASYNC_NORMAL_ACTIVE; func_exit (); return 0; }
static int gs_wait_tx_flushed (void * ptr, unsigned long timeout) { struct gs_port *port = ptr; unsigned long end_jiffies; int jiffies_to_transmit, charsleft = 0, rv = 0; int rcib; func_enter(); gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port); if (port) { gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n", port->xmit_cnt, port->xmit_buf, port->tty); } if (!port || port->xmit_cnt < 0 || !port->xmit_buf) { gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n"); func_exit(); return -EINVAL; /* This is an error which we don't know how to handle. */ } rcib = gs_real_chars_in_buffer(port->tty); if(rcib <= 0) { gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n"); func_exit(); return rv; } /* stop trying: now + twice the time it would normally take + seconds */ if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; end_jiffies = jiffies; if (timeout != MAX_SCHEDULE_TIMEOUT) end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0; end_jiffies += timeout; gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n", jiffies, end_jiffies, end_jiffies-jiffies); /* the expression is actually jiffies < end_jiffies, but that won't work around the wraparound. Tricky eh? */ while ((charsleft = gs_real_chars_in_buffer (port->tty)) && time_after (end_jiffies, jiffies)) { /* Units check: chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies! check! */ charsleft += 16; /* Allow 16 chars more to be transmitted ... */ jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0; /* ^^^ Round up.... */ if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1; gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies " "(%d chars).\n", jiffies_to_transmit, charsleft); msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit)); if (signal_pending (current)) { gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: "); rv = -EINTR; break; } } gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft); set_current_state (TASK_RUNNING); func_exit(); return rv; }
int gs_write(struct tty_struct * tty, const unsigned char *buf, int count) { struct gs_port *port; int c, total = 0; int t; func_enter (); if (!tty) return 0; port = tty->driver_data; if (!port) return 0; if (! (port->flags & ASYNC_INITIALIZED)) return 0; /* get exclusive "write" access to this port (problem 3) */ /* This is not a spinlock because we can have a disk access (page fault) in copy_from_user */ mutex_lock(& port->port_write_mutex); while (1) { c = count; /* This is safe because we "OWN" the "head". Noone else can change the "head": we own the port_write_mutex. */ /* Don't overrun the end of the buffer */ t = SERIAL_XMIT_SIZE - port->xmit_head; if (t < c) c = t; /* This is safe because the xmit_cnt can only decrease. This would increase "t", so we might copy too little chars. */ /* Don't copy past the "head" of the buffer */ t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt; if (t < c) c = t; /* Can't copy more? break out! */ if (c <= 0) break; memcpy (port->xmit_buf + port->xmit_head, buf, c); port -> xmit_cnt += c; port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1); buf += c; count -= c; total += c; } mutex_unlock(& port->port_write_mutex); gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n", (port->flags & GS_TX_INTEN)?"enabled": "disabled"); if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped && !(port->flags & GS_TX_INTEN)) { port->flags |= GS_TX_INTEN; port->rd->enable_tx_interrupts (port); } func_exit (); return total; }
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 (); }