23 static int tty_port_default_receive_buf(struct tty_port *port,  in tty_port_default_receive_buf()  argument
31 	tty = READ_ONCE(port->itty);  in tty_port_default_receive_buf()
46 static void tty_port_default_lookahead_buf(struct tty_port *port, const unsigned char *p,  in tty_port_default_lookahead_buf()  argument
52 	tty = READ_ONCE(port->itty);  in tty_port_default_lookahead_buf()
66 static void tty_port_default_wakeup(struct tty_port *port)  in tty_port_default_wakeup()  argument
68 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_default_wakeup()
92 void tty_port_init(struct tty_port *port)  in tty_port_init()  argument
94 	memset(port, 0, sizeof(*port));  in tty_port_init()
95 	tty_buffer_init(port);  in tty_port_init()
96 	init_waitqueue_head(&port->open_wait);  in tty_port_init()
97 	init_waitqueue_head(&port->delta_msr_wait);  in tty_port_init()
98 	mutex_init(&port->mutex);  in tty_port_init()
99 	mutex_init(&port->buf_mutex);  in tty_port_init()
100 	spin_lock_init(&port->lock);  in tty_port_init()
101 	port->close_delay = (50 * HZ) / 100;  in tty_port_init()
102 	port->closing_wait = (3000 * HZ) / 100;  in tty_port_init()
103 	port->client_ops = &tty_port_default_client_ops;  in tty_port_init()
104 	kref_init(&port->kref);  in tty_port_init()
119 void tty_port_link_device(struct tty_port *port,  in tty_port_link_device()  argument
124 	driver->ports[index] = port;  in tty_port_link_device()
139 struct device *tty_port_register_device(struct tty_port *port,  in tty_port_register_device()  argument
143 	return tty_port_register_device_attr(port, driver, index, device, NULL, NULL);  in tty_port_register_device()
160 struct device *tty_port_register_device_attr(struct tty_port *port,  in tty_port_register_device_attr()  argument
165 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr()
183 struct device *tty_port_register_device_attr_serdev(struct tty_port *port,  in tty_port_register_device_attr_serdev()  argument
190 	tty_port_link_device(port, driver, index);  in tty_port_register_device_attr_serdev()
192 	dev = serdev_tty_port_register(port, device, driver, index);  in tty_port_register_device_attr_serdev()
213 struct device *tty_port_register_device_serdev(struct tty_port *port,  in tty_port_register_device_serdev()  argument
217 	return tty_port_register_device_attr_serdev(port, driver, index,  in tty_port_register_device_serdev()
232 void tty_port_unregister_device(struct tty_port *port,  in tty_port_unregister_device()  argument
237 	ret = serdev_tty_port_unregister(port);  in tty_port_unregister_device()
245 int tty_port_alloc_xmit_buf(struct tty_port *port)  in tty_port_alloc_xmit_buf()  argument
248 	mutex_lock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
249 	if (port->xmit_buf == NULL) {  in tty_port_alloc_xmit_buf()
250 		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);  in tty_port_alloc_xmit_buf()
251 		if (port->xmit_buf)  in tty_port_alloc_xmit_buf()
252 			kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);  in tty_port_alloc_xmit_buf()
254 	mutex_unlock(&port->buf_mutex);  in tty_port_alloc_xmit_buf()
255 	if (port->xmit_buf == NULL)  in tty_port_alloc_xmit_buf()
261 void tty_port_free_xmit_buf(struct tty_port *port)  in tty_port_free_xmit_buf()  argument
263 	mutex_lock(&port->buf_mutex);  in tty_port_free_xmit_buf()
264 	free_page((unsigned long)port->xmit_buf);  in tty_port_free_xmit_buf()
265 	port->xmit_buf = NULL;  in tty_port_free_xmit_buf()
266 	INIT_KFIFO(port->xmit_fifo);  in tty_port_free_xmit_buf()
267 	mutex_unlock(&port->buf_mutex);  in tty_port_free_xmit_buf()
279 void tty_port_destroy(struct tty_port *port)  in tty_port_destroy()  argument
281 	tty_buffer_cancel_work(port);  in tty_port_destroy()
282 	tty_buffer_free_all(port);  in tty_port_destroy()
288 	struct tty_port *port = container_of(kref, struct tty_port, kref);  in tty_port_destructor()  local
291 	if (WARN_ON(port->itty))  in tty_port_destructor()
293 	free_page((unsigned long)port->xmit_buf);  in tty_port_destructor()
294 	tty_port_destroy(port);  in tty_port_destructor()
295 	if (port->ops && port->ops->destruct)  in tty_port_destructor()
296 		port->ops->destruct(port);  in tty_port_destructor()
298 		kfree(port);  in tty_port_destructor()
308 void tty_port_put(struct tty_port *port)  in tty_port_put()  argument
310 	if (port)  in tty_port_put()
311 		kref_put(&port->kref, tty_port_destructor);  in tty_port_put()
322 struct tty_struct *tty_port_tty_get(struct tty_port *port)  in tty_port_tty_get()  argument
327 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_get()
328 	tty = tty_kref_get(port->tty);  in tty_port_tty_get()
329 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_get()
342 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)  in tty_port_tty_set()  argument
346 	spin_lock_irqsave(&port->lock, flags);  in tty_port_tty_set()
347 	tty_kref_put(port->tty);  in tty_port_tty_set()
348 	port->tty = tty_kref_get(tty);  in tty_port_tty_set()
349 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_tty_set()
363 static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)  in tty_port_shutdown()  argument
365 	mutex_lock(&port->mutex);  in tty_port_shutdown()
366 	if (port->console)  in tty_port_shutdown()
369 	if (tty_port_initialized(port)) {  in tty_port_shutdown()
370 		tty_port_set_initialized(port, 0);  in tty_port_shutdown()
376 			tty_port_lower_dtr_rts(port);  in tty_port_shutdown()
378 		if (port->ops->shutdown)  in tty_port_shutdown()
379 			port->ops->shutdown(port);  in tty_port_shutdown()
382 	mutex_unlock(&port->mutex);  in tty_port_shutdown()
394 void tty_port_hangup(struct tty_port *port)  in tty_port_hangup()  argument
399 	spin_lock_irqsave(&port->lock, flags);  in tty_port_hangup()
400 	port->count = 0;  in tty_port_hangup()
401 	tty = port->tty;  in tty_port_hangup()
404 	port->tty = NULL;  in tty_port_hangup()
405 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_hangup()
406 	tty_port_set_active(port, 0);  in tty_port_hangup()
407 	tty_port_shutdown(port, tty);  in tty_port_hangup()
409 	wake_up_interruptible(&port->open_wait);  in tty_port_hangup()
410 	wake_up_interruptible(&port->delta_msr_wait);  in tty_port_hangup()
419 void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)  in tty_port_tty_hangup()  argument
421 	struct tty_struct *tty = tty_port_tty_get(port);  in tty_port_tty_hangup()
433 void tty_port_tty_wakeup(struct tty_port *port)  in tty_port_tty_wakeup()  argument
435 	port->client_ops->write_wakeup(port);  in tty_port_tty_wakeup()
447 int tty_port_carrier_raised(struct tty_port *port)  in tty_port_carrier_raised()  argument
449 	if (port->ops->carrier_raised == NULL)  in tty_port_carrier_raised()
451 	return port->ops->carrier_raised(port);  in tty_port_carrier_raised()
463 void tty_port_raise_dtr_rts(struct tty_port *port)  in tty_port_raise_dtr_rts()  argument
465 	if (port->ops->dtr_rts)  in tty_port_raise_dtr_rts()
466 		port->ops->dtr_rts(port, 1);  in tty_port_raise_dtr_rts()
478 void tty_port_lower_dtr_rts(struct tty_port *port)  in tty_port_lower_dtr_rts()  argument
480 	if (port->ops->dtr_rts)  in tty_port_lower_dtr_rts()
481 		port->ops->dtr_rts(port, 0);  in tty_port_lower_dtr_rts()
510 int tty_port_block_til_ready(struct tty_port *port,  in tty_port_block_til_ready()  argument
521 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
527 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
528 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
543 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
544 	port->count--;  in tty_port_block_til_ready()
545 	port->blocked_open++;  in tty_port_block_til_ready()
546 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
550 		if (C_BAUD(tty) && tty_port_initialized(port))  in tty_port_block_til_ready()
551 			tty_port_raise_dtr_rts(port);  in tty_port_block_til_ready()
553 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);  in tty_port_block_til_ready()
557 		if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {  in tty_port_block_til_ready()
558 			if (port->flags & ASYNC_HUP_NOTIFY)  in tty_port_block_til_ready()
570 		if (do_clocal || tty_port_carrier_raised(port))  in tty_port_block_til_ready()
580 	finish_wait(&port->open_wait, &wait);  in tty_port_block_til_ready()
585 	spin_lock_irqsave(&port->lock, flags);  in tty_port_block_til_ready()
587 		port->count++;  in tty_port_block_til_ready()
588 	port->blocked_open--;  in tty_port_block_til_ready()
589 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_block_til_ready()
591 		tty_port_set_active(port, 1);  in tty_port_block_til_ready()
596 static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)  in tty_port_drain_delay()  argument
602 		timeout = (HZ * 10 * port->drain_delay) / bps;  in tty_port_drain_delay()
625 int tty_port_close_start(struct tty_port *port,  in tty_port_close_start()  argument
633 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_start()
634 	if (tty->count == 1 && port->count != 1) {  in tty_port_close_start()
636 			 port->count);  in tty_port_close_start()
637 		port->count = 1;  in tty_port_close_start()
639 	if (--port->count < 0) {  in tty_port_close_start()
641 			 port->count);  in tty_port_close_start()
642 		port->count = 0;  in tty_port_close_start()
645 	if (port->count) {  in tty_port_close_start()
646 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
649 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_start()
653 	if (tty_port_initialized(port)) {  in tty_port_close_start()
657 		if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)  in tty_port_close_start()
658 			tty_wait_until_sent(tty, port->closing_wait);  in tty_port_close_start()
659 		if (port->drain_delay)  in tty_port_close_start()
660 			tty_port_drain_delay(port, tty);  in tty_port_close_start()
681 void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)  in tty_port_close_end()  argument
688 	spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
690 	if (port->blocked_open) {  in tty_port_close_end()
691 		spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
692 		if (port->close_delay)  in tty_port_close_end()
693 			msleep_interruptible(jiffies_to_msecs(port->close_delay));  in tty_port_close_end()
694 		spin_lock_irqsave(&port->lock, flags);  in tty_port_close_end()
695 		wake_up_interruptible(&port->open_wait);  in tty_port_close_end()
697 	spin_unlock_irqrestore(&port->lock, flags);  in tty_port_close_end()
698 	tty_port_set_active(port, 0);  in tty_port_close_end()
715 void tty_port_close(struct tty_port *port, struct tty_struct *tty,  in tty_port_close()  argument
718 	if (tty_port_close_start(port, tty, filp) == 0)  in tty_port_close()
720 	tty_port_shutdown(port, tty);  in tty_port_close()
721 	if (!port->console)  in tty_port_close()
723 	tty_port_close_end(port, tty);  in tty_port_close()
724 	tty_port_tty_set(port, NULL);  in tty_port_close()
738 int tty_port_install(struct tty_port *port, struct tty_driver *driver,  in tty_port_install()  argument
741 	tty->port = port;  in tty_port_install()
765 int tty_port_open(struct tty_port *port, struct tty_struct *tty,  in tty_port_open()  argument
768 	spin_lock_irq(&port->lock);  in tty_port_open()
769 	++port->count;  in tty_port_open()
770 	spin_unlock_irq(&port->lock);  in tty_port_open()
771 	tty_port_tty_set(port, tty);  in tty_port_open()
779 	mutex_lock(&port->mutex);  in tty_port_open()
781 	if (!tty_port_initialized(port)) {  in tty_port_open()
783 		if (port->ops->activate) {  in tty_port_open()
784 			int retval = port->ops->activate(port, tty);  in tty_port_open()
787 				mutex_unlock(&port->mutex);  in tty_port_open()
791 		tty_port_set_initialized(port, 1);  in tty_port_open()
793 	mutex_unlock(&port->mutex);  in tty_port_open()
794 	return tty_port_block_til_ready(port, tty, filp);  in tty_port_open()