drivers/char/tty_port.c

/*
 * Tty port functions
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/module.h>

void tty_port_init(struct tty_port *port)
{
	memset(port, 0, sizeof(*port));
	init_waitqueue_head(&port->open_wait);
	init_waitqueue_head(&port->close_wait);
	mutex_init(&port->mutex);
	spin_lock_init(&port->lock);
	port->close_delay = (50 * HZ) / 100;
	port->closing_wait = (3000 * HZ) / 100;
}
EXPORT_SYMBOL(tty_port_init);

int tty_port_alloc_xmit_buf(struct tty_port *port)
{
	/* We may sleep in get_zeroed_page() */
	mutex_lock(&port->mutex);
	if (port->xmit_buf == NULL)
		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
	mutex_unlock(&port->mutex);
	if (port->xmit_buf == NULL)
		return -ENOMEM;
	return 0;
}
EXPORT_SYMBOL(tty_port_alloc_xmit_buf);

void tty_port_free_xmit_buf(struct tty_port *port)
{
	mutex_lock(&port->mutex);
	if (port->xmit_buf != NULL) {
		free_page((unsigned long)port->xmit_buf);
		port->xmit_buf = NULL;
	}
	mutex_unlock(&port->mutex);
}
EXPORT_SYMBOL(tty_port_free_xmit_buf);


/**
 *	tty_port_tty_get	-	get a tty reference
 *	@port: tty port
 *
 *	Return a refcount protected tty instance or NULL if the port is not
 *	associated with a tty (eg due to close or hangup)
 */

struct tty_struct *tty_port_tty_get(struct tty_port *port)
{
	unsigned long flags;
	struct tty_struct *tty;

	spin_lock_irqsave(&port->lock, flags);
	tty = tty_kref_get(port->tty);
	spin_unlock_irqrestore(&port->lock, flags);
	return tty;
}
EXPORT_SYMBOL(tty_port_tty_get);

/**
 *	tty_port_tty_set	-	set the tty of a port
 *	@port: tty port
 *	@tty: the tty
 *
 *	Associate the port and tty pair. Manages any internal refcounts.
 *	Pass NULL to deassociate a port
 */

void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
{
	unsigned long flags;

	spin_lock_irqsave(&port->lock, flags);
	if (port->tty)
		tty_kref_put(port->tty);
	port->tty = tty_kref_get(tty);
	spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL(tty_port_tty_set);

static void tty_port_shutdown(struct tty_port *port)
{
	if (port->ops->shutdown &&
		test_and_clear_bit(ASYNC_INITIALIZED, &port->flags))
			port->ops->shutdown(port);

}

/**
 *	tty_port_hangup		-	hangup helper
 *	@port: tty port
 *
 *	Perform port level tty hangup flag and count changes. Drop the tty
 *	reference.
 */

void tty_port_hangup(struct tty_port *port)
{
	unsigned long flags;

	spin_lock_irqsave(&port->lock, flags);
	port->count = 0;
	port->flags &= ~ASYNC_NORMAL_ACTIVE;
	if (port->tty)
		tty_kref_put(port->tty);
	port->tty = NULL;
	spin_unlock_irqrestore(&port->lock, flags);
	wake_up_interruptible(&port->open_wait);
	tty_port_shutdown(port);
}
EXPORT_SYMBOL(tty_port_hangup);

/**
 *	tty_port_carrier_raised	-	carrier raised check
 *	@port: tty port
 *
 *	Wrapper for the carrier detect logic. For the moment this is used
 *	to hide some internal details. This will eventually become entirely
 *	internal to the tty port.
 */

int tty_port_carrier_raised(struct tty_port *port)
{
	if (port->ops->carrier_raised == NULL)
		return 1;
	return port->ops->carrier_raised(port);
}
EXPORT_SYMBOL(tty_port_carrier_raised);

/**
 *	tty_port_raise_dtr_rts	-	Raise DTR/RTS
 *	@port: tty port
 *
 *	Wrapper for the DTR/RTS raise logic. For the moment this is used
 *	to hide some internal details. This will eventually become entirely
 *	internal to the tty port.
 */

void tty_port_raise_dtr_rts(struct tty_port *port)
{
	if (port->ops->dtr_rts)
		port->ops->dtr_rts(port, 1);
}
EXPORT_SYMBOL(tty_port_raise_dtr_rts);

/**
 *	tty_port_lower_dtr_rts	-	Lower DTR/RTS
 *	@port: tty port
 *
 *	Wrapper for the DTR/RTS raise logic. For the moment this is used
 *	to hide some internal details. This will eventually become entirely
 *	internal to the tty port.
 */

void tty_port_lower_dtr_rts(struct tty_port *port)
{
	if (port->ops->dtr_rts)
		port->ops->dtr_rts(port, 0);
}
EXPORT_SYMBOL(tty_port_lower_dtr_rts);

/**
 *	tty_port_block_til_ready	-	Waiting logic for tty open
 *	@port: the tty port being opened
 *	@tty: the tty device being bound
 *	@filp: the file pointer of the opener
 *
 *	Implement the core POSIX/SuS tty behaviour when opening a tty device.
 *	Handles:
 *		- hangup (both before and during)
 *		- non blocking open
 *		- rts/dtr/dcd
 *		- signals
 *		- port flags and counts
 *
 *	The passed tty_port must implement the carrier_raised method if it can
 *	do carrier detect and the dtr_rts method if it supports software
 *	management of these lines. Note that the dtr/rts raise is done each
 *	iteration as a hangup may have previously dropped them while we wait.
 */
 
int tty_port_block_til_ready(struct tty_port *port,
				struct tty_struct *tty, struct file *filp)
{
	int do_clocal = 0, retval;
	unsigned long flags;
	DEFINE_WAIT(wait);
	int cd;

	/* block if port is in the process of being closed */
	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
		wait_event_interruptible(port->close_wait,
				!(port->flags & ASYNC_CLOSING));
		if (port->flags & ASYNC_HUP_NOTIFY)
			return -EAGAIN;
		else
			return -ERESTARTSYS;
	}

	/* if non-blocking mode is set we can pass directly to open unless
	   the port has just hung up or is in another error state */
	if ((filp->f_flags & O_NONBLOCK) ||
			(tty->flags & (1 << TTY_IO_ERROR))) {
		port->flags |= ASYNC_NORMAL_ACTIVE;
		return 0;
	}

	if (C_CLOCAL(tty))
		do_clocal = 1;

	/* Block waiting until we can proceed. We may need to wait for the
	   carrier, but we must also wait for any close that is in progress
	   before the next open may complete */

	retval = 0;

	/* The port lock protects the port counts */
	spin_lock_irqsave(&port->lock, flags);
	if (!tty_hung_up_p(filp))
		port->count--;
	port->blocked_open++;
	spin_unlock_irqrestore(&port->lock, flags);

	while (1) {
		/* Indicate we are open */
		if (tty->termios->c_cflag & CBAUD)
			tty_port_raise_dtr_rts(port);

		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
		/* Check for a hangup or uninitialised port. Return accordingly */
		if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
			if (port->flags & ASYNC_HUP_NOTIFY)
				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;
			break;
		}
		/* Probe the carrier. For devices with no carrier detect this
		   will always return true */
		cd = tty_port_carrier_raised(port);
		if (!(port->flags & ASYNC_CLOSING) &&
				(do_clocal || cd))
			break;
		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
		schedule();
	}
	finish_wait(&port->open_wait, &wait);

	/* Update counts. A parallel hangup will have set count to zero and
	   we must not mess that up further */
	spin_lock_irqsave(&port->lock, flags);
	if (!tty_hung_up_p(filp))
		port->count++;
	port->blocked_open--;
	if (retval == 0)
		port->flags |= ASYNC_NORMAL_ACTIVE;
	spin_unlock_irqrestore(&port->lock, flags);
	return retval;
	
}
EXPORT_SYMBOL(tty_port_block_til_ready);

int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct file *filp)
{
	unsigned long flags;

	spin_lock_irqsave(&port->lock, flags);
	if (tty_hung_up_p(filp)) {
		spin_unlock_irqrestore(&port->lock, flags);
		return 0;
	}

	if( tty->count == 1 && port->count != 1) {
		printk(KERN_WARNING
		    "tty_port_close_start: tty->count = 1 port count = %d.\n",
								port->count);
		port->count = 1;
	}
	if (--port->count < 0) {
		printk(KERN_WARNING "tty_port_close_start: count = %d\n",
								port->count);
		port->count = 0;
	}

	if (port->count) {
		spin_unlock_irqrestore(&port->lock, flags);
		if (port->ops->drop)
			port->ops->drop(port);
		return 0;
	}
	set_bit(ASYNC_CLOSING, &port->flags);
	tty->closing = 1;
	spin_unlock_irqrestore(&port->lock, flags);
	/* Don't block on a stalled port, just pull the chain */
	if (tty->flow_stopped)
		tty_driver_flush_buffer(tty);
	if (test_bit(ASYNCB_INITIALIZED, &port->flags) &&
			port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
		tty_wait_until_sent(tty, port->closing_wait);
	if (port->drain_delay) {
		unsigned int bps = tty_get_baud_rate(tty);
		long timeout;

		if (bps > 1200)
			timeout = max_t(long, (HZ * 10 * port->drain_delay) / bps,
								HZ / 10);
		else
			timeout = 2 * HZ;
		schedule_timeout_interruptible(timeout);
	}
	/* Don't call port->drop for the last reference. Callers will want
	   to drop the last active reference in ->shutdown() or the tty
	   shutdown path */
	return 1;
}
EXPORT_SYMBOL(tty_port_close_start);

void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
{
	unsigned long flags;

	tty_ldisc_flush(tty);

	if (tty->termios->c_cflag & HUPCL)
		tty_port_lower_dtr_rts(port);

	spin_lock_irqsave(&port->lock, flags);
	tty->closing = 0;

	if (port->blocked_open) {
		spin_unlock_irqrestore(&port->lock, flags);
		if (port->close_delay) {
			msleep_interruptible(
				jiffies_to_msecs(port->close_delay));
		}
		spin_lock_irqsave(&port->lock, flags);
		wake_up_interruptible(&port->open_wait);
	}
	port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
	wake_up_interruptible(&port->close_wait);
	spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL(tty_port_close_end);

void tty_port_close(struct tty_port *port, struct tty_struct *tty,
							struct file *filp)
{
	if (tty_port_close_start(port, tty, filp) == 0)
		return;
	tty_port_shutdown(port);
	tty_port_close_end(port, tty);
	tty_port_tty_set(port, NULL);
}
EXPORT_SYMBOL(tty_port_close);