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()
282 struct tty_struct *tty_port_tty_get(struct tty_port *port)  in tty_port_tty_get()  argument
287 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_get()
288 	tty = tty_kref_get(port->tty);  in tty_port_tty_get()
289 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_get()
302 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)  in tty_port_tty_set()  argument
306 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_set()
307 	tty_kref_put(port->tty);  in tty_port_tty_set()
308 	port->tty = tty_kref_get(tty);  in tty_port_tty_set()
309 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_set()
313 static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)  in tty_port_shutdown()  argument
315 	mutex_lock(&port->mutex);  in tty_port_shutdown()
316 	if (port->console)  in tty_port_shutdown()
319 	if (tty_port_initialized(port)) {  in tty_port_shutdown()
320 		tty_port_set_initialized(port, 0);  in tty_port_shutdown()
326 			tty_port_lower_dtr_rts(port);  in tty_port_shutdown()
328 		if (port->ops->shutdown)  in tty_port_shutdown()
329 			port->ops->shutdown(port);  in tty_port_shutdown()
332 	mutex_unlock(&port->mutex);  in tty_port_shutdown()
344 void tty_port_hangup(struct tty_port *port)  in tty_port_hangup()  argument
349 	spin_lock_irqsave(&port->lock, flags);  in tty_port_hangup()
350 	port->count = 0;  in tty_port_hangup()
351 	tty = port->tty;  in tty_port_hangup()
354 	port->tty = NULL;  in tty_port_hangup()
355 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_hangup()
356 	tty_port_set_active(port, 0);  in tty_port_hangup()
357 	tty_port_shutdown(port, tty);  in tty_port_hangup()
359 	wake_up_interruptible(&port->open_wait);  in tty_port_hangup()
360 	wake_up_interruptible(&port->delta_msr_wait);  in tty_port_hangup()
370 void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)  in tty_port_tty_hangup()  argument
372 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_tty_hangup()
385 void tty_port_tty_wakeup(struct tty_port *port)  in tty_port_tty_wakeup()  argument
387 	port->client_ops->write_wakeup(port);  in tty_port_tty_wakeup()
399 int tty_port_carrier_raised(struct tty_port *port)  in tty_port_carrier_raised()  argument
401 	if (port->ops->carrier_raised == NULL)  in tty_port_carrier_raised()
403 	return port->ops->carrier_raised(port);  in tty_port_carrier_raised()
415 void tty_port_raise_dtr_rts(struct tty_port *port)  in tty_port_raise_dtr_rts()  argument
417 	if (port->ops->dtr_rts)  in tty_port_raise_dtr_rts()
418 		port->ops->dtr_rts(port, 1);  in tty_port_raise_dtr_rts()
430 void tty_port_lower_dtr_rts(struct tty_port *port)  in tty_port_lower_dtr_rts()  argument
432 	if (port->ops->dtr_rts)  in tty_port_lower_dtr_rts()
433 		port->ops->dtr_rts(port, 0);  in tty_port_lower_dtr_rts()
461 int tty_port_block_til_ready(struct tty_port *port,  in tty_port_block_til_ready()  argument
471 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
477 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
478 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
492 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
493 	port->count--;  in tty_port_block_til_ready()
494 	port->blocked_open++;  in tty_port_block_til_ready()
495 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
499 		if (C_BAUD(tty) && tty_port_initialized(port))  in tty_port_block_til_ready()
500 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
502 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);  in tty_port_block_til_ready()
505 		if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {  in tty_port_block_til_ready()
506 			if (port->flags & ASYNC_HUP_NOTIFY)  in tty_port_block_til_ready()
518 		if (do_clocal || tty_port_carrier_raised(port))  in tty_port_block_til_ready()
528 	finish_wait(&port->open_wait, &wait);  in tty_port_block_til_ready()
532 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
534 		port->count++;  in tty_port_block_til_ready()
535 	port->blocked_open--;  in tty_port_block_til_ready()
536 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
538 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
543 static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)  in tty_port_drain_delay()  argument
549 		timeout = (HZ * 10 * port->drain_delay) / bps;  in tty_port_drain_delay()
558 int tty_port_close_start(struct tty_port *port,  in tty_port_close_start()  argument
566 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_start()
567 	if (tty->count == 1 && port->count != 1) {  in tty_port_close_start()
569 			 port->count);  in tty_port_close_start()
570 		port->count = 1;  in tty_port_close_start()
572 	if (--port->count < 0) {  in tty_port_close_start()
574 			 port->count);  in tty_port_close_start()
575 		port->count = 0;  in tty_port_close_start()
578 	if (port->count) {  in tty_port_close_start()
579 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
582 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
586 	if (tty_port_initialized(port)) {  in tty_port_close_start()
590 		if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)  in tty_port_close_start()
591 			tty_wait_until_sent(tty, port->closing_wait);  in tty_port_close_start()
592 		if (port->drain_delay)  in tty_port_close_start()
593 			tty_port_drain_delay(port, tty);  in tty_port_close_start()
604 void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)  in tty_port_close_end()  argument
611 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
613 	if (port->blocked_open) {  in tty_port_close_end()
614 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
615 		if (port->close_delay)  in tty_port_close_end()
616 			msleep_interruptible(jiffies_to_msecs(port->close_delay));  in tty_port_close_end()
617 		spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
618 		wake_up_interruptible(&port->open_wait);  in tty_port_close_end()
620 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
621 	tty_port_set_active(port, 0);  in tty_port_close_end()
630 void tty_port_close(struct tty_port *port, struct tty_struct *tty,  in tty_port_close()  argument
633 	if (tty_port_close_start(port, tty, filp) == 0)  in tty_port_close()
635 	tty_port_shutdown(port, tty);  in tty_port_close()
636 	if (!port->console)  in tty_port_close()
638 	tty_port_close_end(port, tty);  in tty_port_close()
639 	tty_port_tty_set(port, NULL);  in tty_port_close()
653 int tty_port_install(struct tty_port *port, struct tty_driver *driver,  in tty_port_install()  argument
656 	tty->port = port;  in tty_port_install()
669 int tty_port_open(struct tty_port *port, struct tty_struct *tty,  in tty_port_open()  argument
672 	spin_lock_irq(&port->lock);  in tty_port_open()
673 	++port->count;  in tty_port_open()
674 	spin_unlock_irq(&port->lock);  in tty_port_open()
675 	tty_port_tty_set(port, tty);  in tty_port_open()
683 	mutex_lock(&port->mutex);  in tty_port_open()
685 	if (!tty_port_initialized(port)) {  in tty_port_open()
687 		if (port->ops->activate) {  in tty_port_open()
688 			int retval = port->ops->activate(port, tty);  in tty_port_open()
690 				mutex_unlock(&port->mutex);  in tty_port_open()
694 		tty_port_set_initialized(port, 1);  in tty_port_open()
696 	mutex_unlock(&port->mutex);  in tty_port_open()
697 	return tty_port_block_til_ready(port, tty, filp);  in tty_port_open()