22 static int tty_port_default_receive_buf(struct tty_port *port,  in tty_port_default_receive_buf()  argument
30 	tty = READ_ONCE(port->itty);  in tty_port_default_receive_buf()
45 static void tty_port_default_wakeup(struct tty_port *port)  in tty_port_default_wakeup()  argument
47 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_default_wakeup()
60 void tty_port_init(struct tty_port *port)  in tty_port_init()  argument
62 	memset(port, 0, sizeof(*port));  in tty_port_init()
63 	tty_buffer_init(port);  in tty_port_init()
64 	init_waitqueue_head(&port->open_wait);  in tty_port_init()
65 	init_waitqueue_head(&port->delta_msr_wait);  in tty_port_init()
66 	mutex_init(&port->mutex);  in tty_port_init()
67 	mutex_init(&port->buf_mutex);  in tty_port_init()
68 	spin_lock_init(&port->lock);  in tty_port_init()
69 	port->close_delay = (50 * HZ) / 100;  in tty_port_init()
70 	port->closing_wait = (3000 * HZ) / 100;  in tty_port_init()
71 	port->client_ops = &default_client_ops;  in tty_port_init()
72 	kref_init(&port->kref);  in tty_port_init()
87 void tty_port_link_device(struct tty_port *port,  in tty_port_link_device()  argument
92 	driver->ports[index] = port;  in tty_port_link_device()
107 struct device *tty_port_register_device(struct tty_port *port,  in tty_port_register_device()  argument
111 	return tty_port_register_device_attr(port, driver, index, device, NULL, NULL);  in tty_port_register_device()
128 struct device *tty_port_register_device_attr(struct tty_port *port,  in tty_port_register_device_attr()  argument
133 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr()
151 struct device *tty_port_register_device_attr_serdev(struct tty_port *port,  in tty_port_register_device_attr_serdev()  argument
158 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr_serdev()
160 	dev = serdev_tty_port_register(port, device, driver, index);  in tty_port_register_device_attr_serdev()
181 struct device *tty_port_register_device_serdev(struct tty_port *port,  in tty_port_register_device_serdev()  argument
185 	return tty_port_register_device_attr_serdev(port, driver, index,  in tty_port_register_device_serdev()
200 void tty_port_unregister_device(struct tty_port *port,  in tty_port_unregister_device()  argument
205 	ret = serdev_tty_port_unregister(port);  in tty_port_unregister_device()
213 int tty_port_alloc_xmit_buf(struct tty_port *port)  in tty_port_alloc_xmit_buf()  argument
216 	mutex_lock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
217 	if (port->xmit_buf == NULL)  in tty_port_alloc_xmit_buf()
218 		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);  in tty_port_alloc_xmit_buf()
219 	mutex_unlock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
220 	if (port->xmit_buf == NULL)  in tty_port_alloc_xmit_buf()
226 void tty_port_free_xmit_buf(struct tty_port *port)  in tty_port_free_xmit_buf()  argument
228 	mutex_lock(&port->buf_mutex);  in tty_port_free_xmit_buf()
229 	if (port->xmit_buf != NULL) {  in tty_port_free_xmit_buf()
230 		free_page((unsigned long)port->xmit_buf);  in tty_port_free_xmit_buf()
231 		port->xmit_buf = NULL;  in tty_port_free_xmit_buf()
233 	mutex_unlock(&port->buf_mutex);  in tty_port_free_xmit_buf()
245 void tty_port_destroy(struct tty_port *port)  in tty_port_destroy()  argument
247 	tty_buffer_cancel_work(port);  in tty_port_destroy()
248 	tty_buffer_free_all(port);  in tty_port_destroy()
254 	struct tty_port *port = container_of(kref, struct tty_port, kref);  in tty_port_destructor()  local
257 	if (WARN_ON(port->itty))  in tty_port_destructor()
259 	if (port->xmit_buf)  in tty_port_destructor()
260 		free_page((unsigned long)port->xmit_buf);  in tty_port_destructor()
261 	tty_port_destroy(port);  in tty_port_destructor()
262 	if (port->ops && port->ops->destruct)  in tty_port_destructor()
263 		port->ops->destruct(port);  in tty_port_destructor()
265 		kfree(port);  in tty_port_destructor()
268 void tty_port_put(struct tty_port *port)  in tty_port_put()  argument
270 	if (port)  in tty_port_put()
271 		kref_put(&port->kref, tty_port_destructor);  in tty_port_put()
283 struct tty_struct *tty_port_tty_get(struct tty_port *port)  in tty_port_tty_get()  argument
288 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_get()
289 	tty = tty_kref_get(port->tty);  in tty_port_tty_get()
290 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_get()
304 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)  in tty_port_tty_set()  argument
308 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_set()
309 	tty_kref_put(port->tty);  in tty_port_tty_set()
310 	port->tty = tty_kref_get(tty);  in tty_port_tty_set()
311 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_set()
315 static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)  in tty_port_shutdown()  argument
317 	mutex_lock(&port->mutex);  in tty_port_shutdown()
318 	if (port->console)  in tty_port_shutdown()
321 	if (tty_port_initialized(port)) {  in tty_port_shutdown()
322 		tty_port_set_initialized(port, 0);  in tty_port_shutdown()
328 			tty_port_lower_dtr_rts(port);  in tty_port_shutdown()
330 		if (port->ops->shutdown)  in tty_port_shutdown()
331 			port->ops->shutdown(port);  in tty_port_shutdown()
334 	mutex_unlock(&port->mutex);  in tty_port_shutdown()
347 void tty_port_hangup(struct tty_port *port)  in tty_port_hangup()  argument
352 	spin_lock_irqsave(&port->lock, flags);  in tty_port_hangup()
353 	port->count = 0;  in tty_port_hangup()
354 	tty = port->tty;  in tty_port_hangup()
357 	port->tty = NULL;  in tty_port_hangup()
358 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_hangup()
359 	tty_port_set_active(port, 0);  in tty_port_hangup()
360 	tty_port_shutdown(port, tty);  in tty_port_hangup()
362 	wake_up_interruptible(&port->open_wait);  in tty_port_hangup()
363 	wake_up_interruptible(&port->delta_msr_wait);  in tty_port_hangup()
373 void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)  in tty_port_tty_hangup()  argument
375 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_tty_hangup()
388 void tty_port_tty_wakeup(struct tty_port *port)  in tty_port_tty_wakeup()  argument
390 	port->client_ops->write_wakeup(port);  in tty_port_tty_wakeup()
403 int tty_port_carrier_raised(struct tty_port *port)  in tty_port_carrier_raised()  argument
405 	if (port->ops->carrier_raised == NULL)  in tty_port_carrier_raised()
407 	return port->ops->carrier_raised(port);  in tty_port_carrier_raised()
420 void tty_port_raise_dtr_rts(struct tty_port *port)  in tty_port_raise_dtr_rts()  argument
422 	if (port->ops->dtr_rts)  in tty_port_raise_dtr_rts()
423 		port->ops->dtr_rts(port, 1);  in tty_port_raise_dtr_rts()
436 void tty_port_lower_dtr_rts(struct tty_port *port)  in tty_port_lower_dtr_rts()  argument
438 	if (port->ops->dtr_rts)  in tty_port_lower_dtr_rts()
439 		port->ops->dtr_rts(port, 0);  in tty_port_lower_dtr_rts()
468 int tty_port_block_til_ready(struct tty_port *port,  in tty_port_block_til_ready()  argument
478 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
484 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
485 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
499 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
500 	port->count--;  in tty_port_block_til_ready()
501 	port->blocked_open++;  in tty_port_block_til_ready()
502 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
506 		if (C_BAUD(tty) && tty_port_initialized(port))  in tty_port_block_til_ready()
507 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
509 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);  in tty_port_block_til_ready()
512 		if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {  in tty_port_block_til_ready()
513 			if (port->flags & ASYNC_HUP_NOTIFY)  in tty_port_block_til_ready()
525 		if (do_clocal || tty_port_carrier_raised(port))  in tty_port_block_til_ready()
535 	finish_wait(&port->open_wait, &wait);  in tty_port_block_til_ready()
539 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
541 		port->count++;  in tty_port_block_til_ready()
542 	port->blocked_open--;  in tty_port_block_til_ready()
543 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
545 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
550 static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)  in tty_port_drain_delay()  argument
556 		timeout = (HZ * 10 * port->drain_delay) / bps;  in tty_port_drain_delay()
565 int tty_port_close_start(struct tty_port *port,  in tty_port_close_start()  argument
573 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_start()
574 	if (tty->count == 1 && port->count != 1) {  in tty_port_close_start()
576 			 port->count);  in tty_port_close_start()
577 		port->count = 1;  in tty_port_close_start()
579 	if (--port->count < 0) {  in tty_port_close_start()
581 			 port->count);  in tty_port_close_start()
582 		port->count = 0;  in tty_port_close_start()
585 	if (port->count) {  in tty_port_close_start()
586 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
589 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
593 	if (tty_port_initialized(port)) {  in tty_port_close_start()
597 		if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)  in tty_port_close_start()
598 			tty_wait_until_sent(tty, port->closing_wait);  in tty_port_close_start()
599 		if (port->drain_delay)  in tty_port_close_start()
600 			tty_port_drain_delay(port, tty);  in tty_port_close_start()
611 void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)  in tty_port_close_end()  argument
618 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
620 	if (port->blocked_open) {  in tty_port_close_end()
621 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
622 		if (port->close_delay)  in tty_port_close_end()
623 			msleep_interruptible(jiffies_to_msecs(port->close_delay));  in tty_port_close_end()
624 		spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
625 		wake_up_interruptible(&port->open_wait);  in tty_port_close_end()
627 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
628 	tty_port_set_active(port, 0);  in tty_port_close_end()
637 void tty_port_close(struct tty_port *port, struct tty_struct *tty,  in tty_port_close()  argument
640 	if (tty_port_close_start(port, tty, filp) == 0)  in tty_port_close()
642 	tty_port_shutdown(port, tty);  in tty_port_close()
644 	tty_port_close_end(port, tty);  in tty_port_close()
645 	tty_port_tty_set(port, NULL);  in tty_port_close()
659 int tty_port_install(struct tty_port *port, struct tty_driver *driver,  in tty_port_install()  argument
662 	tty->port = port;  in tty_port_install()
675 int tty_port_open(struct tty_port *port, struct tty_struct *tty,  in tty_port_open()  argument
678 	spin_lock_irq(&port->lock);  in tty_port_open()
679 	++port->count;  in tty_port_open()
680 	spin_unlock_irq(&port->lock);  in tty_port_open()
681 	tty_port_tty_set(port, tty);  in tty_port_open()
689 	mutex_lock(&port->mutex);  in tty_port_open()
691 	if (!tty_port_initialized(port)) {  in tty_port_open()
693 		if (port->ops->activate) {  in tty_port_open()
694 			int retval = port->ops->activate(port, tty);  in tty_port_open()
696 				mutex_unlock(&port->mutex);  in tty_port_open()
700 		tty_port_set_initialized(port, 1);  in tty_port_open()
702 	mutex_unlock(&port->mutex);  in tty_port_open()
703 	return tty_port_block_til_ready(port, tty, filp);  in tty_port_open()