1 // SPDX-License-Identifier: GPL-2.0+
3 *  Digi AccelePort USB-4 and USB-2 Serial Converters
7 *  Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
8 *  usb-serial driver.
31 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
33 /* port output buffer length -- must be <= transfer buffer length - 2 */
37 /* port input buffer length -- must be >= transfer buffer length - 3 */
54 #define DIGI_2_ID			0x0002	/* USB-2 */
55 #define DIGI_4_ID			0x0004	/* USB-4 */
58  * "INB": can be used on the in-band endpoint
59  * "OOB": can be used on the out-of-band endpoint
182 	struct usb_serial_port *ds_oob_port;	/* out-of-band port */
183 	int ds_oob_port_num;			/* index of out-of-band port */
363  *  if successful, -EINTR if interrupted while sleeping and
364  *  the interruptible flag is true, or a negative error
373 …(struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;  in digi_write_oob_command()
377 	dev_dbg(&port->dev,  in digi_write_oob_command()
379 		oob_priv->dp_port_num, count);  in digi_write_oob_command()
381 	spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
383 		while (oob_priv->dp_write_urb_in_use) {  in digi_write_oob_command()
385 				&oob_priv->write_wait, DIGI_RETRY_TIMEOUT,  in digi_write_oob_command()
386 				&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
388 				return -EINTR;  in digi_write_oob_command()
389 			spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
393 		len = min(count, oob_port->bulk_out_size);  in digi_write_oob_command()
396 		memcpy(oob_port->write_urb->transfer_buffer, buf, len);  in digi_write_oob_command()
397 		oob_port->write_urb->transfer_buffer_length = len;  in digi_write_oob_command()
398 		ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);  in digi_write_oob_command()
400 			oob_priv->dp_write_urb_in_use = 1;  in digi_write_oob_command()
401 			count -= len;  in digi_write_oob_command()
405 	spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
407 		dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",  in digi_write_oob_command()
420  *  is non-zero, write in band command will return after
422  *  timeout ticks.  Returns 0 if successful, or a negative
432 	unsigned char *data = port->write_urb->transfer_buffer;  in digi_write_inb_command()
435 	dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",  in digi_write_inb_command()
436 		priv->dp_port_num, count);  in digi_write_inb_command()
443 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_inb_command()
445 		while (priv->dp_write_urb_in_use &&  in digi_write_inb_command()
448 				&priv->write_wait, DIGI_RETRY_TIMEOUT,  in digi_write_inb_command()
449 				&priv->dp_port_lock, flags);  in digi_write_inb_command()
451 				return -EINTR;  in digi_write_inb_command()
452 			spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_inb_command()
456 		/* guarantee the write will send buffered data first, */  in digi_write_inb_command()
458 		len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);  in digi_write_inb_command()
462 		/* write any buffered data first */  in digi_write_inb_command()
463 		if (priv->dp_out_buf_len > 0) {  in digi_write_inb_command()
465 			data[1] = priv->dp_out_buf_len;  in digi_write_inb_command()
466 			memcpy(data + 2, priv->dp_out_buf,  in digi_write_inb_command()
467 				priv->dp_out_buf_len);  in digi_write_inb_command()
468 			memcpy(data + 2 + priv->dp_out_buf_len, buf, len);  in digi_write_inb_command()
469 			port->write_urb->transfer_buffer_length  in digi_write_inb_command()
470 				= priv->dp_out_buf_len + 2 + len;  in digi_write_inb_command()
473 			port->write_urb->transfer_buffer_length = len;  in digi_write_inb_command()
476 		ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);  in digi_write_inb_command()
478 			priv->dp_write_urb_in_use = 1;  in digi_write_inb_command()
479 			priv->dp_out_buf_len = 0;  in digi_write_inb_command()
480 			count -= len;  in digi_write_inb_command()
485 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_inb_command()
488 		dev_err(&port->dev,  in digi_write_inb_command()
490 			__func__, ret, priv->dp_port_num);  in digi_write_inb_command()
501  *  -EINTR if interrupted while sleeping, or a non-zero error
511 …struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;  in digi_set_modem_signals()
513 	unsigned char *data = oob_port->write_urb->transfer_buffer;  in digi_set_modem_signals()
516 	dev_dbg(&port->dev,  in digi_set_modem_signals()
518 		port_priv->dp_port_num, modem_signals);  in digi_set_modem_signals()
520 	spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
521 	spin_lock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
523 	while (oob_priv->dp_write_urb_in_use) {  in digi_set_modem_signals()
524 		spin_unlock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
526 			&oob_priv->write_wait, DIGI_RETRY_TIMEOUT,  in digi_set_modem_signals()
527 			&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
529 			return -EINTR;  in digi_set_modem_signals()
530 		spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
531 		spin_lock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
534 	data[1] = port_priv->dp_port_num;  in digi_set_modem_signals()
539 	data[5] = port_priv->dp_port_num;  in digi_set_modem_signals()
544 	oob_port->write_urb->transfer_buffer_length = 8;  in digi_set_modem_signals()
546 	ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);  in digi_set_modem_signals()
548 		oob_priv->dp_write_urb_in_use = 1;  in digi_set_modem_signals()
549 		port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS);  in digi_set_modem_signals()
550 		port_priv->dp_modem_signals |=  in digi_set_modem_signals()
553 	spin_unlock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
554 	spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
556 		dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",  in digi_set_modem_signals()
565  *  to go idle.  It returns 0 if successful or a negative error.
581 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_transmit_idle()
582 	priv->dp_transmit_idle = 0;  in digi_transmit_idle()
583 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_transmit_idle()
590 	ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);  in digi_transmit_idle()
594 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_transmit_idle()
596 	while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {  in digi_transmit_idle()
598 			&priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,  in digi_transmit_idle()
599 			&priv->dp_port_lock, flags);  in digi_transmit_idle()
601 			return -EINTR;  in digi_transmit_idle()
602 		spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_transmit_idle()
604 	priv->dp_transmit_idle = 0;  in digi_transmit_idle()
605 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_transmit_idle()
614 	struct usb_serial_port *port = tty->driver_data;  in digi_rx_throttle()
618 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_rx_throttle()
619 	priv->dp_throttled = 1;  in digi_rx_throttle()
620 	priv->dp_throttle_restart = 0;  in digi_rx_throttle()
621 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_rx_throttle()
629 	struct usb_serial_port *port = tty->driver_data;  in digi_rx_unthrottle()
632 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_rx_unthrottle()
635 	if (priv->dp_throttle_restart)  in digi_rx_unthrottle()
636 		ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);  in digi_rx_unthrottle()
639 	priv->dp_throttled = 0;  in digi_rx_unthrottle()
640 	priv->dp_throttle_restart = 0;  in digi_rx_unthrottle()
642 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_rx_unthrottle()
645 		dev_err(&port->dev,  in digi_rx_unthrottle()
647 			__func__, ret, priv->dp_port_num);  in digi_rx_unthrottle()
655 	struct device *dev = &port->dev;  in digi_set_termios()
656 	unsigned int iflag = tty->termios.c_iflag;  in digi_set_termios()
657 	unsigned int cflag = tty->termios.c_cflag;  in digi_set_termios()
658 	unsigned int old_iflag = old_termios->c_iflag;  in digi_set_termios()
659 	unsigned int old_cflag = old_termios->c_cflag;  in digi_set_termios()
668 		priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);  in digi_set_termios()
673 		arg = -1;  in digi_set_termios()
710 		if (arg != -1) {  in digi_set_termios()
712 			buf[i++] = priv->dp_port_num;  in digi_set_termios()
718 	tty->termios.c_cflag &= ~CMSPAR;  in digi_set_termios()
730 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
736 		arg = -1;  in digi_set_termios()
749 		if (arg != -1) {  in digi_set_termios()
751 			buf[i++] = priv->dp_port_num;  in digi_set_termios()
767 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
785 			/* On USB-4 it is necessary to assert RTS prior */  in digi_set_termios()
788 			buf[i++] = priv->dp_port_num;  in digi_set_termios()
796 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
816 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
829 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
842 	struct usb_serial_port *port = tty->driver_data;  in digi_break_ctl()
855 	struct usb_serial_port *port = tty->driver_data;  in digi_tiocmget()
860 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_tiocmget()
861 	val = priv->dp_modem_signals;  in digi_tiocmget()
862 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_tiocmget()
870 	struct usb_serial_port *port = tty->driver_data;  in digi_tiocmset()
875 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_tiocmset()
876 	val = (priv->dp_modem_signals & ~clear) | set;  in digi_tiocmset()
877 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_tiocmset()
888 	unsigned char *data = port->write_urb->transfer_buffer;  in digi_write()
891 	dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d\n",  in digi_write()
892 		priv->dp_port_num, count);  in digi_write()
895 	count = min(count, port->bulk_out_size-2);  in digi_write()
900 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write()
903 	if (priv->dp_write_urb_in_use) {  in digi_write()
905 		if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {  in digi_write()
906 			priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;  in digi_write()
911 		spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write()
915 	/* allow space for any buffered data and for new data, up to */  in digi_write()
916 	/* transfer buffer size - 2 (for command and length bytes) */  in digi_write()
917 	new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);  in digi_write()
918 	data_len = new_len + priv->dp_out_buf_len;  in digi_write()
921 		spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write()
925 	port->write_urb->transfer_buffer_length = data_len+2;  in digi_write()
930 	/* copy in buffered data first */  in digi_write()
931 	memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);  in digi_write()
932 	data += priv->dp_out_buf_len;  in digi_write()
937 	ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);  in digi_write()
939 		priv->dp_write_urb_in_use = 1;  in digi_write()
941 		priv->dp_out_buf_len = 0;  in digi_write()
945 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write()
949 			__func__, ret, priv->dp_port_num);  in digi_write()
950 	dev_dbg(&port->dev, "digi_write: returning %d\n", ret);  in digi_write()
958 	struct usb_serial_port *port = urb->context;  in digi_write_bulk_callback()
964 	int status = urb->status;  in digi_write_bulk_callback()
969 		pr_err("%s: port or port->private is NULL, status=%d\n",  in digi_write_bulk_callback()
973 	serial = port->serial;  in digi_write_bulk_callback()
975 		dev_err(&port->dev,  in digi_write_bulk_callback()
976 			"%s: serial or serial->private is NULL, status=%d\n",  in digi_write_bulk_callback()
982 	if (priv->dp_port_num == serial_priv->ds_oob_port_num) {  in digi_write_bulk_callback()
983 		dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");  in digi_write_bulk_callback()
984 		spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
985 		priv->dp_write_urb_in_use = 0;  in digi_write_bulk_callback()
986 		wake_up_interruptible(&priv->write_wait);  in digi_write_bulk_callback()
987 		spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
991 	/* try to send any buffered data on this port */  in digi_write_bulk_callback()
993 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
994 	priv->dp_write_urb_in_use = 0;  in digi_write_bulk_callback()
995 	if (priv->dp_out_buf_len > 0) {  in digi_write_bulk_callback()
996 		*((unsigned char *)(port->write_urb->transfer_buffer))  in digi_write_bulk_callback()
998 		*((unsigned char *)(port->write_urb->transfer_buffer) + 1)  in digi_write_bulk_callback()
999 			= (unsigned char)priv->dp_out_buf_len;  in digi_write_bulk_callback()
1000 		port->write_urb->transfer_buffer_length =  in digi_write_bulk_callback()
1001 						priv->dp_out_buf_len + 2;  in digi_write_bulk_callback()
1002 		memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,  in digi_write_bulk_callback()
1003 			priv->dp_out_buf_len);  in digi_write_bulk_callback()
1004 		ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);  in digi_write_bulk_callback()
1006 			priv->dp_write_urb_in_use = 1;  in digi_write_bulk_callback()
1007 			priv->dp_out_buf_len = 0;  in digi_write_bulk_callback()
1011 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
1013 	if (ret && ret != -EPERM)  in digi_write_bulk_callback()
1016 			__func__, ret, priv->dp_port_num);  in digi_write_bulk_callback()
1019 		tty_port_tty_wakeup(&port->port);  in digi_write_bulk_callback()
1024 	struct usb_serial_port *port = tty->driver_data;  in digi_write_room()
1029 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_room()
1031 	if (priv->dp_write_urb_in_use)  in digi_write_room()
1034 		room = port->bulk_out_size - 2 - priv->dp_out_buf_len;  in digi_write_room()
1036 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_room()
1037 	dev_dbg(&port->dev, "digi_write_room: port=%d, room=%u\n", priv->dp_port_num, room);  in digi_write_room()
1044 	struct usb_serial_port *port = tty->driver_data;  in digi_chars_in_buffer()
1049 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_chars_in_buffer()
1050 	if (priv->dp_write_urb_in_use)  in digi_chars_in_buffer()
1051 		chars = port->bulk_out_size - 2;  in digi_chars_in_buffer()
1053 		chars = priv->dp_out_buf_len;  in digi_chars_in_buffer()
1054 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_chars_in_buffer()
1056 	dev_dbg(&port->dev, "%s: port=%d, chars=%d\n", __func__,  in digi_chars_in_buffer()
1057 			priv->dp_port_num, chars);  in digi_chars_in_buffer()
1075 	if (digi_startup_device(port->serial) != 0)  in digi_open()
1076 		return -ENXIO;  in digi_open()
1080 	buf[1] = priv->dp_port_num;  in digi_open()
1086 	buf[5] = priv->dp_port_num;  in digi_open()
1092 		dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);  in digi_open()
1096 		not_termios.c_cflag = ~tty->termios.c_cflag;  in digi_open()
1097 		not_termios.c_iflag = ~tty->termios.c_iflag;  in digi_open()
1111 	mutex_lock(&port->serial->disc_mutex);  in digi_close()
1113 	if (port->serial->disconnected)  in digi_close()
1121 	buf[1] = priv->dp_port_num;  in digi_close()
1127 	buf[5] = priv->dp_port_num;  in digi_close()
1133 	buf[9] = priv->dp_port_num;  in digi_close()
1139 	buf[13] = priv->dp_port_num;  in digi_close()
1145 	buf[17] = priv->dp_port_num;  in digi_close()
1151 		dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",  in digi_close()
1154 	prepare_to_wait(&priv->dp_flush_wait, &wait,  in digi_close()
1157 	finish_wait(&priv->dp_flush_wait, &wait);  in digi_close()
1160 	usb_kill_urb(port->write_urb);  in digi_close()
1162 	spin_lock_irq(&priv->dp_port_lock);  in digi_close()
1163 	priv->dp_write_urb_in_use = 0;  in digi_close()
1164 	wake_up_interruptible(&priv->dp_close_wait);  in digi_close()
1165 	spin_unlock_irq(&priv->dp_port_lock);  in digi_close()
1166 	mutex_unlock(&port->serial->disc_mutex);  in digi_close()
1174  *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1184 	spin_lock(&serial_priv->ds_serial_lock);  in digi_startup_device()
1185 	if (serial_priv->ds_device_started) {  in digi_startup_device()
1186 		spin_unlock(&serial_priv->ds_serial_lock);  in digi_startup_device()
1189 	serial_priv->ds_device_started = 1;  in digi_startup_device()
1190 	spin_unlock(&serial_priv->ds_serial_lock);  in digi_startup_device()
1194 	for (i = 0; i < serial->type->num_ports + 1; i++) {  in digi_startup_device()
1195 		port = serial->port[i];  in digi_startup_device()
1196 		ret = usb_submit_urb(port->read_urb, GFP_KERNEL);  in digi_startup_device()
1198 			dev_err(&port->dev,  in digi_startup_device()
1213 		return -ENOMEM;  in digi_port_init()
1215 	spin_lock_init(&priv->dp_port_lock);  in digi_port_init()
1216 	priv->dp_port_num = port_num;  in digi_port_init()
1217 	init_waitqueue_head(&priv->dp_transmit_idle_wait);  in digi_port_init()
1218 	init_waitqueue_head(&priv->dp_flush_wait);  in digi_port_init()
1219 	init_waitqueue_head(&priv->dp_close_wait);  in digi_port_init()
1220 	init_waitqueue_head(&priv->write_wait);  in digi_port_init()
1221 	priv->dp_port = port;  in digi_port_init()
1235 		return -ENOMEM;  in digi_startup()
1237 	spin_lock_init(&serial_priv->ds_serial_lock);  in digi_startup()
1238 	serial_priv->ds_oob_port_num = serial->type->num_ports;  in digi_startup()
1239 	serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];  in digi_startup()
1241 	ret = digi_port_init(serial_priv->ds_oob_port,  in digi_startup()
1242 						serial_priv->ds_oob_port_num);  in digi_startup()
1259 	for (i = 0; i < serial->type->num_ports + 1; i++) {  in digi_disconnect()
1260 		usb_kill_urb(serial->port[i]->read_urb);  in digi_disconnect()
1261 		usb_kill_urb(serial->port[i]->write_urb);  in digi_disconnect()
1273 	priv = usb_get_serial_port_data(serial_priv->ds_oob_port);  in digi_release()
1281 	return digi_port_init(port, port->port_number);  in digi_port_probe()
1294 	struct usb_serial_port *port = urb->context;  in digi_read_bulk_callback()
1298 	int status = urb->status;  in digi_read_bulk_callback()
1305 		dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",  in digi_read_bulk_callback()
1309 	if (port->serial == NULL ||  in digi_read_bulk_callback()
1310 		(serial_priv = usb_get_serial_data(port->serial)) == NULL) {  in digi_read_bulk_callback()
1311 		dev_err(&port->dev, "%s: serial is bad or serial->private "  in digi_read_bulk_callback()
1318 		dev_err(&port->dev,  in digi_read_bulk_callback()
1320 			__func__, status, priv->dp_port_num);  in digi_read_bulk_callback()
1325 	if (priv->dp_port_num == serial_priv->ds_oob_port_num) {  in digi_read_bulk_callback()
1335 	if (ret != 0 && ret != -EPERM) {  in digi_read_bulk_callback()
1336 		dev_err(&port->dev,  in digi_read_bulk_callback()
1338 			__func__, ret, priv->dp_port_num);  in digi_read_bulk_callback()
1348  *  port->private are not NULL and port->serial has been validated.
1350  *  throttled, and -1 if the sanity checks failed.
1355 	struct usb_serial_port *port = urb->context;  in digi_read_inb_callback()
1357 	unsigned char *buf = urb->transfer_buffer;  in digi_read_inb_callback()
1366 	if (urb->actual_length < 2) {  in digi_read_inb_callback()
1367 		dev_warn(&port->dev, "short packet received\n");  in digi_read_inb_callback()
1368 		return -1;  in digi_read_inb_callback()
1374 	if (urb->actual_length != len + 2) {  in digi_read_inb_callback()
1375 		dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",  in digi_read_inb_callback()
1376 			priv->dp_port_num, opcode, len, urb->actual_length);  in digi_read_inb_callback()
1377 		return -1;  in digi_read_inb_callback()
1381 		dev_err(&port->dev, "malformed data packet received\n");  in digi_read_inb_callback()
1382 		return -1;  in digi_read_inb_callback()
1385 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_read_inb_callback()
1389 	throttled = priv->dp_throttled;  in digi_read_inb_callback()
1391 		priv->dp_throttle_restart = 1;  in digi_read_inb_callback()
1403 			tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);  in digi_read_inb_callback()
1414 		/* data length is len-1 (one byte of len is port_status) */  in digi_read_inb_callback()
1415 		--len;  in digi_read_inb_callback()
1417 			tty_insert_flip_string_fixed_flag(&port->port, data,  in digi_read_inb_callback()
1419 			tty_flip_buffer_push(&port->port);  in digi_read_inb_callback()
1422 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_read_inb_callback()
1425 		dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);  in digi_read_inb_callback()
1427 		dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);  in digi_read_inb_callback()
1438  *  When called we know port and port->private are not NULL and
1439  *  the port->serial is valid.  It returns 0 if successful, and
1440  *  -1 if the sanity checks failed.
1446 	struct usb_serial_port *port = urb->context;  in digi_read_oob_callback()
1447 	struct usb_serial *serial = port->serial;  in digi_read_oob_callback()
1450 	unsigned char *buf = urb->transfer_buffer;  in digi_read_oob_callback()
1456 	if (urb->actual_length < 4)  in digi_read_oob_callback()
1457 		return -1;  in digi_read_oob_callback()
1460 	for (i = 0; i < urb->actual_length - 3; i += 4) {  in digi_read_oob_callback()
1466 		dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",  in digi_read_oob_callback()
1469 		if (status != 0 || line >= serial->type->num_ports)  in digi_read_oob_callback()
1472 		port = serial->port[line];  in digi_read_oob_callback()
1476 			return -1;  in digi_read_oob_callback()
1478 		tty = tty_port_tty_get(&port->port);  in digi_read_oob_callback()
1487 			spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1490 				priv->dp_modem_signals |= TIOCM_CTS;  in digi_read_oob_callback()
1494 				priv->dp_modem_signals &= ~TIOCM_CTS;  in digi_read_oob_callback()
1498 				priv->dp_modem_signals |= TIOCM_DSR;  in digi_read_oob_callback()
1500 				priv->dp_modem_signals &= ~TIOCM_DSR;  in digi_read_oob_callback()
1502 				priv->dp_modem_signals |= TIOCM_RI;  in digi_read_oob_callback()
1504 				priv->dp_modem_signals &= ~TIOCM_RI;  in digi_read_oob_callback()
1506 				priv->dp_modem_signals |= TIOCM_CD;  in digi_read_oob_callback()
1508 				priv->dp_modem_signals &= ~TIOCM_CD;  in digi_read_oob_callback()
1510 			spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1513 				tty_port_tty_wakeup(&port->port);  in digi_read_oob_callback()
1515 			spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1516 			priv->dp_transmit_idle = 1;  in digi_read_oob_callback()
1517 			wake_up_interruptible(&priv->dp_transmit_idle_wait);  in digi_read_oob_callback()
1518 			spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1520 			wake_up_interruptible(&priv->dp_flush_wait);  in digi_read_oob_callback()