23 static size_t tty_port_default_receive_buf(struct tty_port *port, const u8 *p,  in tty_port_default_receive_buf()  argument
29 	tty = READ_ONCE(port->itty);  in tty_port_default_receive_buf()
44 static void tty_port_default_lookahead_buf(struct tty_port *port, const u8 *p,  in tty_port_default_lookahead_buf()  argument
50 	tty = READ_ONCE(port->itty);  in tty_port_default_lookahead_buf()
64 static void tty_port_default_wakeup(struct tty_port *port)  in tty_port_default_wakeup()  argument
66 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_default_wakeup()
90 void tty_port_init(struct tty_port *port)  in tty_port_init()  argument
92 	memset(port, 0, sizeof(*port));  in tty_port_init()
93 	tty_buffer_init(port);  in tty_port_init()
94 	init_waitqueue_head(&port->open_wait);  in tty_port_init()
95 	init_waitqueue_head(&port->delta_msr_wait);  in tty_port_init()
96 	mutex_init(&port->mutex);  in tty_port_init()
97 	mutex_init(&port->buf_mutex);  in tty_port_init()
98 	spin_lock_init(&port->lock);  in tty_port_init()
99 	port->close_delay = (50 * HZ) / 100;  in tty_port_init()
100 	port->closing_wait = (3000 * HZ) / 100;  in tty_port_init()
101 	port->client_ops = &tty_port_default_client_ops;  in tty_port_init()
102 	kref_init(&port->kref);  in tty_port_init()
117 void tty_port_link_device(struct tty_port *port,  in tty_port_link_device()  argument
122 	driver->ports[index] = port;  in tty_port_link_device()
137 struct device *tty_port_register_device(struct tty_port *port,  in tty_port_register_device()  argument
141 	return tty_port_register_device_attr(port, driver, index, device, NULL, NULL);  in tty_port_register_device()
158 struct device *tty_port_register_device_attr(struct tty_port *port,  in tty_port_register_device_attr()  argument
163 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr()
181 struct device *tty_port_register_device_attr_serdev(struct tty_port *port,  in tty_port_register_device_attr_serdev()  argument
188 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr_serdev()
190 	dev = serdev_tty_port_register(port, device, driver, index);  in tty_port_register_device_attr_serdev()
211 struct device *tty_port_register_device_serdev(struct tty_port *port,  in tty_port_register_device_serdev()  argument
215 	return tty_port_register_device_attr_serdev(port, driver, index,  in tty_port_register_device_serdev()
230 void tty_port_unregister_device(struct tty_port *port,  in tty_port_unregister_device()  argument
235 	ret = serdev_tty_port_unregister(port);  in tty_port_unregister_device()
243 int tty_port_alloc_xmit_buf(struct tty_port *port)  in tty_port_alloc_xmit_buf()  argument
246 	mutex_lock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
247 	if (port->xmit_buf == NULL) {  in tty_port_alloc_xmit_buf()
248 		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);  in tty_port_alloc_xmit_buf()
249 		if (port->xmit_buf)  in tty_port_alloc_xmit_buf()
250 			kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);  in tty_port_alloc_xmit_buf()
252 	mutex_unlock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
253 	if (port->xmit_buf == NULL)  in tty_port_alloc_xmit_buf()
259 void tty_port_free_xmit_buf(struct tty_port *port)  in tty_port_free_xmit_buf()  argument
261 	mutex_lock(&port->buf_mutex);  in tty_port_free_xmit_buf()
262 	free_page((unsigned long)port->xmit_buf);  in tty_port_free_xmit_buf()
263 	port->xmit_buf = NULL;  in tty_port_free_xmit_buf()
264 	INIT_KFIFO(port->xmit_fifo);  in tty_port_free_xmit_buf()
265 	mutex_unlock(&port->buf_mutex);  in tty_port_free_xmit_buf()
277 void tty_port_destroy(struct tty_port *port)  in tty_port_destroy()  argument
279 	tty_buffer_cancel_work(port);  in tty_port_destroy()
280 	tty_buffer_free_all(port);  in tty_port_destroy()
286 	struct tty_port *port = container_of(kref, struct tty_port, kref);  in tty_port_destructor()  local
289 	if (WARN_ON(port->itty))  in tty_port_destructor()
291 	free_page((unsigned long)port->xmit_buf);  in tty_port_destructor()
292 	tty_port_destroy(port);  in tty_port_destructor()
293 	if (port->ops && port->ops->destruct)  in tty_port_destructor()
294 		port->ops->destruct(port);  in tty_port_destructor()
296 		kfree(port);  in tty_port_destructor()
306 void tty_port_put(struct tty_port *port)  in tty_port_put()  argument
308 	if (port)  in tty_port_put()
309 		kref_put(&port->kref, tty_port_destructor);  in tty_port_put()
320 struct tty_struct *tty_port_tty_get(struct tty_port *port)  in tty_port_tty_get()  argument
325 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_get()
326 	tty = tty_kref_get(port->tty);  in tty_port_tty_get()
327 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_get()
340 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)  in tty_port_tty_set()  argument
344 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_set()
345 	tty_kref_put(port->tty);  in tty_port_tty_set()
346 	port->tty = tty_kref_get(tty);  in tty_port_tty_set()
347 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_set()
361 static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)  in tty_port_shutdown()  argument
363 	mutex_lock(&port->mutex);  in tty_port_shutdown()
364 	if (port->console)  in tty_port_shutdown()
367 	if (tty_port_initialized(port)) {  in tty_port_shutdown()
368 		tty_port_set_initialized(port, false);  in tty_port_shutdown()
374 			tty_port_lower_dtr_rts(port);  in tty_port_shutdown()
376 		if (port->ops->shutdown)  in tty_port_shutdown()
377 			port->ops->shutdown(port);  in tty_port_shutdown()
380 	mutex_unlock(&port->mutex);  in tty_port_shutdown()
392 void tty_port_hangup(struct tty_port *port)  in tty_port_hangup()  argument
397 	spin_lock_irqsave(&port->lock, flags);  in tty_port_hangup()
398 	port->count = 0;  in tty_port_hangup()
399 	tty = port->tty;  in tty_port_hangup()
402 	port->tty = NULL;  in tty_port_hangup()
403 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_hangup()
404 	tty_port_set_active(port, false);  in tty_port_hangup()
405 	tty_port_shutdown(port, tty);  in tty_port_hangup()
407 	wake_up_interruptible(&port->open_wait);  in tty_port_hangup()
408 	wake_up_interruptible(&port->delta_msr_wait);  in tty_port_hangup()
417 void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)  in tty_port_tty_hangup()  argument
419 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_tty_hangup()
431 void tty_port_tty_wakeup(struct tty_port *port)  in tty_port_tty_wakeup()  argument
433 	port->client_ops->write_wakeup(port);  in tty_port_tty_wakeup()
445 bool tty_port_carrier_raised(struct tty_port *port)  in tty_port_carrier_raised()  argument
447 	if (port->ops->carrier_raised == NULL)  in tty_port_carrier_raised()
449 	return port->ops->carrier_raised(port);  in tty_port_carrier_raised()
461 void tty_port_raise_dtr_rts(struct tty_port *port)  in tty_port_raise_dtr_rts()  argument
463 	if (port->ops->dtr_rts)  in tty_port_raise_dtr_rts()
464 		port->ops->dtr_rts(port, true);  in tty_port_raise_dtr_rts()
476 void tty_port_lower_dtr_rts(struct tty_port *port)  in tty_port_lower_dtr_rts()  argument
478 	if (port->ops->dtr_rts)  in tty_port_lower_dtr_rts()
479 		port->ops->dtr_rts(port, false);  in tty_port_lower_dtr_rts()
508 int tty_port_block_til_ready(struct tty_port *port,  in tty_port_block_til_ready()  argument
519 		tty_port_set_active(port, true);  in tty_port_block_til_ready()
525 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
526 		tty_port_set_active(port, true);  in tty_port_block_til_ready()
541 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
542 	port->count--;  in tty_port_block_til_ready()
543 	port->blocked_open++;  in tty_port_block_til_ready()
544 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
548 		if (C_BAUD(tty) && tty_port_initialized(port))  in tty_port_block_til_ready()
549 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
551 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);  in tty_port_block_til_ready()
555 		if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {  in tty_port_block_til_ready()
556 			if (port->flags & ASYNC_HUP_NOTIFY)  in tty_port_block_til_ready()
568 		if (do_clocal || tty_port_carrier_raised(port))  in tty_port_block_til_ready()
578 	finish_wait(&port->open_wait, &wait);  in tty_port_block_til_ready()
583 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
585 		port->count++;  in tty_port_block_til_ready()
586 	port->blocked_open--;  in tty_port_block_til_ready()
587 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
589 		tty_port_set_active(port, true);  in tty_port_block_til_ready()
594 static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)  in tty_port_drain_delay()  argument
600 		timeout = (HZ * 10 * port->drain_delay) / bps;  in tty_port_drain_delay()
623 int tty_port_close_start(struct tty_port *port,  in tty_port_close_start()  argument
631 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_start()
632 	if (tty->count == 1 && port->count != 1) {  in tty_port_close_start()
634 			 port->count);  in tty_port_close_start()
635 		port->count = 1;  in tty_port_close_start()
637 	if (--port->count < 0) {  in tty_port_close_start()
639 			 port->count);  in tty_port_close_start()
640 		port->count = 0;  in tty_port_close_start()
643 	if (port->count) {  in tty_port_close_start()
644 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
647 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
651 	if (tty_port_initialized(port)) {  in tty_port_close_start()
655 		if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)  in tty_port_close_start()
656 			tty_wait_until_sent(tty, port->closing_wait);  in tty_port_close_start()
657 		if (port->drain_delay)  in tty_port_close_start()
658 			tty_port_drain_delay(port, tty);  in tty_port_close_start()
679 void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)  in tty_port_close_end()  argument
686 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
688 	if (port->blocked_open) {  in tty_port_close_end()
689 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
690 		if (port->close_delay)  in tty_port_close_end()
691 			msleep_interruptible(jiffies_to_msecs(port->close_delay));  in tty_port_close_end()
692 		spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
693 		wake_up_interruptible(&port->open_wait);  in tty_port_close_end()
695 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
696 	tty_port_set_active(port, false);  in tty_port_close_end()
713 void tty_port_close(struct tty_port *port, struct tty_struct *tty,  in tty_port_close()  argument
716 	if (tty_port_close_start(port, tty, filp) == 0)  in tty_port_close()
718 	tty_port_shutdown(port, tty);  in tty_port_close()
719 	if (!port->console)  in tty_port_close()
721 	tty_port_close_end(port, tty);  in tty_port_close()
722 	tty_port_tty_set(port, NULL);  in tty_port_close()
736 int tty_port_install(struct tty_port *port, struct tty_driver *driver,  in tty_port_install()  argument
739 	tty->port = port;  in tty_port_install()
763 int tty_port_open(struct tty_port *port, struct tty_struct *tty,  in tty_port_open()  argument
766 	spin_lock_irq(&port->lock);  in tty_port_open()
767 	++port->count;  in tty_port_open()
768 	spin_unlock_irq(&port->lock);  in tty_port_open()
769 	tty_port_tty_set(port, tty);  in tty_port_open()
777 	mutex_lock(&port->mutex);  in tty_port_open()
779 	if (!tty_port_initialized(port)) {  in tty_port_open()
781 		if (port->ops->activate) {  in tty_port_open()
782 			int retval = port->ops->activate(port, tty);  in tty_port_open()
785 				mutex_unlock(&port->mutex);  in tty_port_open()
789 		tty_port_set_initialized(port, true);  in tty_port_open()
791 	mutex_unlock(&port->mutex);  in tty_port_open()
792 	return tty_port_block_til_ready(port, tty, filp);  in tty_port_open()