20 void tty_port_init(struct tty_port *port)  in tty_port_init()  argument
22 	memset(port, 0, sizeof(*port));  in tty_port_init()
23 	tty_buffer_init(port);  in tty_port_init()
24 	init_waitqueue_head(&port->open_wait);  in tty_port_init()
25 	init_waitqueue_head(&port->close_wait);  in tty_port_init()
26 	init_waitqueue_head(&port->delta_msr_wait);  in tty_port_init()
27 	mutex_init(&port->mutex);  in tty_port_init()
28 	mutex_init(&port->buf_mutex);  in tty_port_init()
29 	spin_lock_init(&port->lock);  in tty_port_init()
30 	port->close_delay = (50 * HZ) / 100;  in tty_port_init()
31 	port->closing_wait = (3000 * HZ) / 100;  in tty_port_init()
32 	kref_init(&port->kref);  in tty_port_init()
47 void tty_port_link_device(struct tty_port *port,  in tty_port_link_device()  argument
52 	driver->ports[index] = port;  in tty_port_link_device()
67 struct device *tty_port_register_device(struct tty_port *port,  in tty_port_register_device()  argument
71 	tty_port_link_device(port, driver, index);  in tty_port_register_device()
89 struct device *tty_port_register_device_attr(struct tty_port *port,  in tty_port_register_device_attr()  argument
94 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr()
100 int tty_port_alloc_xmit_buf(struct tty_port *port)  in tty_port_alloc_xmit_buf()  argument
103 	mutex_lock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
104 	if (port->xmit_buf == NULL)  in tty_port_alloc_xmit_buf()
105 		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);  in tty_port_alloc_xmit_buf()
106 	mutex_unlock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
107 	if (port->xmit_buf == NULL)  in tty_port_alloc_xmit_buf()
113 void tty_port_free_xmit_buf(struct tty_port *port)  in tty_port_free_xmit_buf()  argument
115 	mutex_lock(&port->buf_mutex);  in tty_port_free_xmit_buf()
116 	if (port->xmit_buf != NULL) {  in tty_port_free_xmit_buf()
117 		free_page((unsigned long)port->xmit_buf);  in tty_port_free_xmit_buf()
118 		port->xmit_buf = NULL;  in tty_port_free_xmit_buf()
120 	mutex_unlock(&port->buf_mutex);  in tty_port_free_xmit_buf()
132 void tty_port_destroy(struct tty_port *port)  in tty_port_destroy()  argument
134 	cancel_work_sync(&port->buf.work);  in tty_port_destroy()
135 	tty_buffer_free_all(port);  in tty_port_destroy()
141 	struct tty_port *port = container_of(kref, struct tty_port, kref);  in tty_port_destructor()  local
144 	if (WARN_ON(port->itty))  in tty_port_destructor()
146 	if (port->xmit_buf)  in tty_port_destructor()
147 		free_page((unsigned long)port->xmit_buf);  in tty_port_destructor()
148 	tty_port_destroy(port);  in tty_port_destructor()
149 	if (port->ops && port->ops->destruct)  in tty_port_destructor()
150 		port->ops->destruct(port);  in tty_port_destructor()
152 		kfree(port);  in tty_port_destructor()
155 void tty_port_put(struct tty_port *port)  in tty_port_put()  argument
157 	if (port)  in tty_port_put()
158 		kref_put(&port->kref, tty_port_destructor);  in tty_port_put()
170 struct tty_struct *tty_port_tty_get(struct tty_port *port)  in tty_port_tty_get()  argument
175 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_get()
176 	tty = tty_kref_get(port->tty);  in tty_port_tty_get()
177 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_get()
191 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)  in tty_port_tty_set()  argument
195 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_set()
196 	tty_kref_put(port->tty);  in tty_port_tty_set()
197 	port->tty = tty_kref_get(tty);  in tty_port_tty_set()
198 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_set()
202 static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)  in tty_port_shutdown()  argument
204 	mutex_lock(&port->mutex);  in tty_port_shutdown()
205 	if (port->console)  in tty_port_shutdown()
208 	if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {  in tty_port_shutdown()
214 			tty_port_lower_dtr_rts(port);  in tty_port_shutdown()
216 		if (port->ops->shutdown)  in tty_port_shutdown()
217 			port->ops->shutdown(port);  in tty_port_shutdown()
220 	mutex_unlock(&port->mutex);  in tty_port_shutdown()
233 void tty_port_hangup(struct tty_port *port)  in tty_port_hangup()  argument
238 	spin_lock_irqsave(&port->lock, flags);  in tty_port_hangup()
239 	port->count = 0;  in tty_port_hangup()
240 	port->flags &= ~ASYNC_NORMAL_ACTIVE;  in tty_port_hangup()
241 	tty = port->tty;  in tty_port_hangup()
244 	port->tty = NULL;  in tty_port_hangup()
245 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_hangup()
246 	tty_port_shutdown(port, tty);  in tty_port_hangup()
248 	wake_up_interruptible(&port->open_wait);  in tty_port_hangup()
249 	wake_up_interruptible(&port->delta_msr_wait);  in tty_port_hangup()
259 void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)  in tty_port_tty_hangup()  argument
261 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_tty_hangup()
274 void tty_port_tty_wakeup(struct tty_port *port)  in tty_port_tty_wakeup()  argument
276 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_tty_wakeup()
294 int tty_port_carrier_raised(struct tty_port *port)  in tty_port_carrier_raised()  argument
296 	if (port->ops->carrier_raised == NULL)  in tty_port_carrier_raised()
298 	return port->ops->carrier_raised(port);  in tty_port_carrier_raised()
311 void tty_port_raise_dtr_rts(struct tty_port *port)  in tty_port_raise_dtr_rts()  argument
313 	if (port->ops->dtr_rts)  in tty_port_raise_dtr_rts()
314 		port->ops->dtr_rts(port, 1);  in tty_port_raise_dtr_rts()
327 void tty_port_lower_dtr_rts(struct tty_port *port)  in tty_port_lower_dtr_rts()  argument
329 	if (port->ops->dtr_rts)  in tty_port_lower_dtr_rts()
330 		port->ops->dtr_rts(port, 0);  in tty_port_lower_dtr_rts()
359 int tty_port_block_til_ready(struct tty_port *port,  in tty_port_block_til_ready()  argument
367 	if (port->flags & ASYNC_CLOSING) {  in tty_port_block_til_ready()
368 		wait_event_interruptible_tty(tty, port->close_wait,  in tty_port_block_til_ready()
369 				!(port->flags & ASYNC_CLOSING));  in tty_port_block_til_ready()
370 		if (port->flags & ASYNC_HUP_NOTIFY)  in tty_port_block_til_ready()
379 		port->flags |= ASYNC_NORMAL_ACTIVE;  in tty_port_block_til_ready()
385 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
386 		port->flags |= ASYNC_NORMAL_ACTIVE;  in tty_port_block_til_ready()
400 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
401 	port->count--;  in tty_port_block_til_ready()
402 	port->blocked_open++;  in tty_port_block_til_ready()
403 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
407 		if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))  in tty_port_block_til_ready()
408 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
410 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);  in tty_port_block_til_ready()
413 		if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {  in tty_port_block_til_ready()
414 			if (port->flags & ASYNC_HUP_NOTIFY)  in tty_port_block_til_ready()
426 		if (!(port->flags & ASYNC_CLOSING) &&  in tty_port_block_til_ready()
427 				(do_clocal || tty_port_carrier_raised(port)))  in tty_port_block_til_ready()
437 	finish_wait(&port->open_wait, &wait);  in tty_port_block_til_ready()
441 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
443 		port->count++;  in tty_port_block_til_ready()
444 	port->blocked_open--;  in tty_port_block_til_ready()
446 		port->flags |= ASYNC_NORMAL_ACTIVE;  in tty_port_block_til_ready()
447 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
452 static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)  in tty_port_drain_delay()  argument
458 		timeout = (HZ * 10 * port->drain_delay) / bps;  in tty_port_drain_delay()
470 int tty_port_close_start(struct tty_port *port,  in tty_port_close_start()  argument
478 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_start()
479 	if (tty->count == 1 && port->count != 1) {  in tty_port_close_start()
482 								port->count);  in tty_port_close_start()
483 		port->count = 1;  in tty_port_close_start()
485 	if (--port->count < 0) {  in tty_port_close_start()
487 								port->count);  in tty_port_close_start()
488 		port->count = 0;  in tty_port_close_start()
491 	if (port->count) {  in tty_port_close_start()
492 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
495 	set_bit(ASYNCB_CLOSING, &port->flags);  in tty_port_close_start()
496 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
500 	if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {  in tty_port_close_start()
504 		if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)  in tty_port_close_start()
505 			tty_wait_until_sent_from_close(tty, port->closing_wait);  in tty_port_close_start()
506 		if (port->drain_delay)  in tty_port_close_start()
507 			tty_port_drain_delay(port, tty);  in tty_port_close_start()
518 void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)  in tty_port_close_end()  argument
525 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
527 	if (port->blocked_open) {  in tty_port_close_end()
528 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
529 		if (port->close_delay) {  in tty_port_close_end()
531 				jiffies_to_msecs(port->close_delay));  in tty_port_close_end()
533 		spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
534 		wake_up_interruptible(&port->open_wait);  in tty_port_close_end()
536 	port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);  in tty_port_close_end()
537 	wake_up_interruptible(&port->close_wait);  in tty_port_close_end()
538 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
551 void tty_port_close(struct tty_port *port, struct tty_struct *tty,  in tty_port_close()  argument
554 	if (tty_port_close_start(port, tty, filp) == 0)  in tty_port_close()
556 	tty_port_shutdown(port, tty);  in tty_port_close()
558 	tty_port_close_end(port, tty);  in tty_port_close()
559 	tty_port_tty_set(port, NULL);  in tty_port_close()
573 int tty_port_install(struct tty_port *port, struct tty_driver *driver,  in tty_port_install()  argument
576 	tty->port = port;  in tty_port_install()
589 int tty_port_open(struct tty_port *port, struct tty_struct *tty,  in tty_port_open()  argument
592 	spin_lock_irq(&port->lock);  in tty_port_open()
593 	++port->count;  in tty_port_open()
594 	spin_unlock_irq(&port->lock);  in tty_port_open()
595 	tty_port_tty_set(port, tty);  in tty_port_open()
603 	mutex_lock(&port->mutex);  in tty_port_open()
605 	if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) {  in tty_port_open()
607 		if (port->ops->activate) {  in tty_port_open()
608 			int retval = port->ops->activate(port, tty);  in tty_port_open()
610 				mutex_unlock(&port->mutex);  in tty_port_open()
614 		set_bit(ASYNCB_INITIALIZED, &port->flags);  in tty_port_open()
616 	mutex_unlock(&port->mutex);  in tty_port_open()
617 	return tty_port_block_til_ready(port, tty, filp);  in tty_port_open()