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 */
364  *  if successful, -EINTR if interrupted while sleeping and
365  *  the interruptible flag is true, or a negative error
374 …(struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;  in digi_write_oob_command()
378 	dev_dbg(&port->dev,  in digi_write_oob_command()
380 		oob_priv->dp_port_num, count);  in digi_write_oob_command()
382 	spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
384 		while (oob_priv->dp_write_urb_in_use) {  in digi_write_oob_command()
386 				&oob_priv->write_wait, DIGI_RETRY_TIMEOUT,  in digi_write_oob_command()
387 				&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
389 				return -EINTR;  in digi_write_oob_command()
390 			spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
394 		len = min(count, oob_port->bulk_out_size);  in digi_write_oob_command()
397 		memcpy(oob_port->write_urb->transfer_buffer, buf, len);  in digi_write_oob_command()
398 		oob_port->write_urb->transfer_buffer_length = len;  in digi_write_oob_command()
399 		ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);  in digi_write_oob_command()
401 			oob_priv->dp_write_urb_in_use = 1;  in digi_write_oob_command()
402 			count -= len;  in digi_write_oob_command()
406 	spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);  in digi_write_oob_command()
408 		dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",  in digi_write_oob_command()
421  *  is non-zero, write in band command will return after
423  *  timeout ticks.  Returns 0 if successful, or a negative
433 	unsigned char *data = port->write_urb->transfer_buffer;  in digi_write_inb_command()
436 	dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",  in digi_write_inb_command()
437 		priv->dp_port_num, count);  in digi_write_inb_command()
444 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_inb_command()
446 		while (priv->dp_write_urb_in_use &&  in digi_write_inb_command()
449 				&priv->write_wait, DIGI_RETRY_TIMEOUT,  in digi_write_inb_command()
450 				&priv->dp_port_lock, flags);  in digi_write_inb_command()
452 				return -EINTR;  in digi_write_inb_command()
453 			spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_inb_command()
457 		/* guarantee the write will send buffered data first, */  in digi_write_inb_command()
459 		len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);  in digi_write_inb_command()
463 		/* write any buffered data first */  in digi_write_inb_command()
464 		if (priv->dp_out_buf_len > 0) {  in digi_write_inb_command()
466 			data[1] = priv->dp_out_buf_len;  in digi_write_inb_command()
467 			memcpy(data + 2, priv->dp_out_buf,  in digi_write_inb_command()
468 				priv->dp_out_buf_len);  in digi_write_inb_command()
469 			memcpy(data + 2 + priv->dp_out_buf_len, buf, len);  in digi_write_inb_command()
470 			port->write_urb->transfer_buffer_length  in digi_write_inb_command()
471 				= priv->dp_out_buf_len + 2 + len;  in digi_write_inb_command()
474 			port->write_urb->transfer_buffer_length = len;  in digi_write_inb_command()
477 		ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);  in digi_write_inb_command()
479 			priv->dp_write_urb_in_use = 1;  in digi_write_inb_command()
480 			priv->dp_out_buf_len = 0;  in digi_write_inb_command()
481 			count -= len;  in digi_write_inb_command()
486 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_inb_command()
489 		dev_err(&port->dev,  in digi_write_inb_command()
491 			__func__, ret, priv->dp_port_num);  in digi_write_inb_command()
502  *  -EINTR if interrupted while sleeping, or a non-zero error
512 …struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;  in digi_set_modem_signals()
514 	unsigned char *data = oob_port->write_urb->transfer_buffer;  in digi_set_modem_signals()
517 	dev_dbg(&port->dev,  in digi_set_modem_signals()
519 		port_priv->dp_port_num, modem_signals);  in digi_set_modem_signals()
521 	spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
522 	spin_lock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
524 	while (oob_priv->dp_write_urb_in_use) {  in digi_set_modem_signals()
525 		spin_unlock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
527 			&oob_priv->write_wait, DIGI_RETRY_TIMEOUT,  in digi_set_modem_signals()
528 			&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
530 			return -EINTR;  in digi_set_modem_signals()
531 		spin_lock_irqsave(&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
532 		spin_lock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
535 	data[1] = port_priv->dp_port_num;  in digi_set_modem_signals()
540 	data[5] = port_priv->dp_port_num;  in digi_set_modem_signals()
545 	oob_port->write_urb->transfer_buffer_length = 8;  in digi_set_modem_signals()
547 	ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);  in digi_set_modem_signals()
549 		oob_priv->dp_write_urb_in_use = 1;  in digi_set_modem_signals()
550 		port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS);  in digi_set_modem_signals()
551 		port_priv->dp_modem_signals |=  in digi_set_modem_signals()
554 	spin_unlock(&port_priv->dp_port_lock);  in digi_set_modem_signals()
555 	spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);  in digi_set_modem_signals()
557 		dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",  in digi_set_modem_signals()
566  *  to go idle.  It returns 0 if successful or a negative error.
582 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_transmit_idle()
583 	priv->dp_transmit_idle = 0;  in digi_transmit_idle()
584 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_transmit_idle()
591 	ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);  in digi_transmit_idle()
595 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_transmit_idle()
597 	while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {  in digi_transmit_idle()
599 			&priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,  in digi_transmit_idle()
600 			&priv->dp_port_lock, flags);  in digi_transmit_idle()
602 			return -EINTR;  in digi_transmit_idle()
603 		spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_transmit_idle()
605 	priv->dp_transmit_idle = 0;  in digi_transmit_idle()
606 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_transmit_idle()
615 	struct usb_serial_port *port = tty->driver_data;  in digi_rx_throttle()
619 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_rx_throttle()
620 	priv->dp_throttled = 1;  in digi_rx_throttle()
621 	priv->dp_throttle_restart = 0;  in digi_rx_throttle()
622 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_rx_throttle()
630 	struct usb_serial_port *port = tty->driver_data;  in digi_rx_unthrottle()
633 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_rx_unthrottle()
636 	if (priv->dp_throttle_restart)  in digi_rx_unthrottle()
637 		ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);  in digi_rx_unthrottle()
640 	priv->dp_throttled = 0;  in digi_rx_unthrottle()
641 	priv->dp_throttle_restart = 0;  in digi_rx_unthrottle()
643 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_rx_unthrottle()
646 		dev_err(&port->dev,  in digi_rx_unthrottle()
648 			__func__, ret, priv->dp_port_num);  in digi_rx_unthrottle()
657 	struct device *dev = &port->dev;  in digi_set_termios()
658 	unsigned int iflag = tty->termios.c_iflag;  in digi_set_termios()
659 	unsigned int cflag = tty->termios.c_cflag;  in digi_set_termios()
660 	unsigned int old_iflag = old_termios->c_iflag;  in digi_set_termios()
661 	unsigned int old_cflag = old_termios->c_cflag;  in digi_set_termios()
670 		priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);  in digi_set_termios()
675 		arg = -1;  in digi_set_termios()
712 		if (arg != -1) {  in digi_set_termios()
714 			buf[i++] = priv->dp_port_num;  in digi_set_termios()
720 	tty->termios.c_cflag &= ~CMSPAR;  in digi_set_termios()
732 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
738 		arg = -1;  in digi_set_termios()
751 		if (arg != -1) {  in digi_set_termios()
753 			buf[i++] = priv->dp_port_num;  in digi_set_termios()
769 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
787 			/* On USB-4 it is necessary to assert RTS prior */  in digi_set_termios()
790 			buf[i++] = priv->dp_port_num;  in digi_set_termios()
798 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
818 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
831 		buf[i++] = priv->dp_port_num;  in digi_set_termios()
844 	struct usb_serial_port *port = tty->driver_data;  in digi_break_ctl()
858 	struct usb_serial_port *port = tty->driver_data;  in digi_tiocmget()
863 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_tiocmget()
864 	val = priv->dp_modem_signals;  in digi_tiocmget()
865 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_tiocmget()
873 	struct usb_serial_port *port = tty->driver_data;  in digi_tiocmset()
878 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_tiocmset()
879 	val = (priv->dp_modem_signals & ~clear) | set;  in digi_tiocmset()
880 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_tiocmset()
891 	unsigned char *data = port->write_urb->transfer_buffer;  in digi_write()
894 	dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d\n",  in digi_write()
895 		priv->dp_port_num, count);  in digi_write()
898 	count = min(count, port->bulk_out_size-2);  in digi_write()
903 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write()
906 	if (priv->dp_write_urb_in_use) {  in digi_write()
908 		if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {  in digi_write()
909 			priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;  in digi_write()
914 		spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write()
918 	/* allow space for any buffered data and for new data, up to */  in digi_write()
919 	/* transfer buffer size - 2 (for command and length bytes) */  in digi_write()
920 	new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);  in digi_write()
921 	data_len = new_len + priv->dp_out_buf_len;  in digi_write()
924 		spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write()
928 	port->write_urb->transfer_buffer_length = data_len+2;  in digi_write()
933 	/* copy in buffered data first */  in digi_write()
934 	memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);  in digi_write()
935 	data += priv->dp_out_buf_len;  in digi_write()
940 	ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);  in digi_write()
942 		priv->dp_write_urb_in_use = 1;  in digi_write()
944 		priv->dp_out_buf_len = 0;  in digi_write()
948 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write()
952 			__func__, ret, priv->dp_port_num);  in digi_write()
953 	dev_dbg(&port->dev, "digi_write: returning %d\n", ret);  in digi_write()
961 	struct usb_serial_port *port = urb->context;  in digi_write_bulk_callback()
967 	int status = urb->status;  in digi_write_bulk_callback()
972 		pr_err("%s: port or port->private is NULL, status=%d\n",  in digi_write_bulk_callback()
976 	serial = port->serial;  in digi_write_bulk_callback()
978 		dev_err(&port->dev,  in digi_write_bulk_callback()
979 			"%s: serial or serial->private is NULL, status=%d\n",  in digi_write_bulk_callback()
985 	if (priv->dp_port_num == serial_priv->ds_oob_port_num) {  in digi_write_bulk_callback()
986 		dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");  in digi_write_bulk_callback()
987 		spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
988 		priv->dp_write_urb_in_use = 0;  in digi_write_bulk_callback()
989 		wake_up_interruptible(&priv->write_wait);  in digi_write_bulk_callback()
990 		spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
994 	/* try to send any buffered data on this port */  in digi_write_bulk_callback()
996 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
997 	priv->dp_write_urb_in_use = 0;  in digi_write_bulk_callback()
998 	if (priv->dp_out_buf_len > 0) {  in digi_write_bulk_callback()
999 		*((unsigned char *)(port->write_urb->transfer_buffer))  in digi_write_bulk_callback()
1001 		*((unsigned char *)(port->write_urb->transfer_buffer) + 1)  in digi_write_bulk_callback()
1002 			= (unsigned char)priv->dp_out_buf_len;  in digi_write_bulk_callback()
1003 		port->write_urb->transfer_buffer_length =  in digi_write_bulk_callback()
1004 						priv->dp_out_buf_len + 2;  in digi_write_bulk_callback()
1005 		memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,  in digi_write_bulk_callback()
1006 			priv->dp_out_buf_len);  in digi_write_bulk_callback()
1007 		ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);  in digi_write_bulk_callback()
1009 			priv->dp_write_urb_in_use = 1;  in digi_write_bulk_callback()
1010 			priv->dp_out_buf_len = 0;  in digi_write_bulk_callback()
1014 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_bulk_callback()
1016 	if (ret && ret != -EPERM)  in digi_write_bulk_callback()
1019 			__func__, ret, priv->dp_port_num);  in digi_write_bulk_callback()
1022 		tty_port_tty_wakeup(&port->port);  in digi_write_bulk_callback()
1027 	struct usb_serial_port *port = tty->driver_data;  in digi_write_room()
1032 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_write_room()
1034 	if (priv->dp_write_urb_in_use)  in digi_write_room()
1037 		room = port->bulk_out_size - 2 - priv->dp_out_buf_len;  in digi_write_room()
1039 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_write_room()
1040 	dev_dbg(&port->dev, "digi_write_room: port=%d, room=%u\n", priv->dp_port_num, room);  in digi_write_room()
1047 	struct usb_serial_port *port = tty->driver_data;  in digi_chars_in_buffer()
1052 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_chars_in_buffer()
1053 	if (priv->dp_write_urb_in_use)  in digi_chars_in_buffer()
1054 		chars = port->bulk_out_size - 2;  in digi_chars_in_buffer()
1056 		chars = priv->dp_out_buf_len;  in digi_chars_in_buffer()
1057 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_chars_in_buffer()
1059 	dev_dbg(&port->dev, "%s: port=%d, chars=%d\n", __func__,  in digi_chars_in_buffer()
1060 			priv->dp_port_num, chars);  in digi_chars_in_buffer()
1078 	if (digi_startup_device(port->serial) != 0)  in digi_open()
1079 		return -ENXIO;  in digi_open()
1083 	buf[1] = priv->dp_port_num;  in digi_open()
1089 	buf[5] = priv->dp_port_num;  in digi_open()
1095 		dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);  in digi_open()
1099 		not_termios.c_cflag = ~tty->termios.c_cflag;  in digi_open()
1100 		not_termios.c_iflag = ~tty->termios.c_iflag;  in digi_open()
1114 	mutex_lock(&port->serial->disc_mutex);  in digi_close()
1116 	if (port->serial->disconnected)  in digi_close()
1124 	buf[1] = priv->dp_port_num;  in digi_close()
1130 	buf[5] = priv->dp_port_num;  in digi_close()
1136 	buf[9] = priv->dp_port_num;  in digi_close()
1142 	buf[13] = priv->dp_port_num;  in digi_close()
1148 	buf[17] = priv->dp_port_num;  in digi_close()
1154 		dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",  in digi_close()
1157 	prepare_to_wait(&priv->dp_flush_wait, &wait,  in digi_close()
1160 	finish_wait(&priv->dp_flush_wait, &wait);  in digi_close()
1163 	usb_kill_urb(port->write_urb);  in digi_close()
1165 	spin_lock_irq(&priv->dp_port_lock);  in digi_close()
1166 	priv->dp_write_urb_in_use = 0;  in digi_close()
1167 	wake_up_interruptible(&priv->dp_close_wait);  in digi_close()
1168 	spin_unlock_irq(&priv->dp_port_lock);  in digi_close()
1169 	mutex_unlock(&port->serial->disc_mutex);  in digi_close()
1177  *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1187 	spin_lock(&serial_priv->ds_serial_lock);  in digi_startup_device()
1188 	if (serial_priv->ds_device_started) {  in digi_startup_device()
1189 		spin_unlock(&serial_priv->ds_serial_lock);  in digi_startup_device()
1192 	serial_priv->ds_device_started = 1;  in digi_startup_device()
1193 	spin_unlock(&serial_priv->ds_serial_lock);  in digi_startup_device()
1197 	for (i = 0; i < serial->type->num_ports + 1; i++) {  in digi_startup_device()
1198 		port = serial->port[i];  in digi_startup_device()
1199 		ret = usb_submit_urb(port->read_urb, GFP_KERNEL);  in digi_startup_device()
1201 			dev_err(&port->dev,  in digi_startup_device()
1216 		return -ENOMEM;  in digi_port_init()
1218 	spin_lock_init(&priv->dp_port_lock);  in digi_port_init()
1219 	priv->dp_port_num = port_num;  in digi_port_init()
1220 	init_waitqueue_head(&priv->dp_transmit_idle_wait);  in digi_port_init()
1221 	init_waitqueue_head(&priv->dp_flush_wait);  in digi_port_init()
1222 	init_waitqueue_head(&priv->dp_close_wait);  in digi_port_init()
1223 	init_waitqueue_head(&priv->write_wait);  in digi_port_init()
1224 	priv->dp_port = port;  in digi_port_init()
1238 		return -ENOMEM;  in digi_startup()
1240 	spin_lock_init(&serial_priv->ds_serial_lock);  in digi_startup()
1241 	serial_priv->ds_oob_port_num = serial->type->num_ports;  in digi_startup()
1242 	serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];  in digi_startup()
1244 	ret = digi_port_init(serial_priv->ds_oob_port,  in digi_startup()
1245 						serial_priv->ds_oob_port_num);  in digi_startup()
1262 	for (i = 0; i < serial->type->num_ports + 1; i++) {  in digi_disconnect()
1263 		usb_kill_urb(serial->port[i]->read_urb);  in digi_disconnect()
1264 		usb_kill_urb(serial->port[i]->write_urb);  in digi_disconnect()
1276 	priv = usb_get_serial_port_data(serial_priv->ds_oob_port);  in digi_release()
1284 	return digi_port_init(port, port->port_number);  in digi_port_probe()
1297 	struct usb_serial_port *port = urb->context;  in digi_read_bulk_callback()
1301 	int status = urb->status;  in digi_read_bulk_callback()
1308 		dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",  in digi_read_bulk_callback()
1312 	if (port->serial == NULL ||  in digi_read_bulk_callback()
1313 		(serial_priv = usb_get_serial_data(port->serial)) == NULL) {  in digi_read_bulk_callback()
1314 		dev_err(&port->dev, "%s: serial is bad or serial->private "  in digi_read_bulk_callback()
1321 		dev_err(&port->dev,  in digi_read_bulk_callback()
1323 			__func__, status, priv->dp_port_num);  in digi_read_bulk_callback()
1328 	if (priv->dp_port_num == serial_priv->ds_oob_port_num) {  in digi_read_bulk_callback()
1338 	if (ret != 0 && ret != -EPERM) {  in digi_read_bulk_callback()
1339 		dev_err(&port->dev,  in digi_read_bulk_callback()
1341 			__func__, ret, priv->dp_port_num);  in digi_read_bulk_callback()
1351  *  port->private are not NULL and port->serial has been validated.
1353  *  throttled, and -1 if the sanity checks failed.
1358 	struct usb_serial_port *port = urb->context;  in digi_read_inb_callback()
1360 	unsigned char *buf = urb->transfer_buffer;  in digi_read_inb_callback()
1369 	if (urb->actual_length < 2) {  in digi_read_inb_callback()
1370 		dev_warn(&port->dev, "short packet received\n");  in digi_read_inb_callback()
1371 		return -1;  in digi_read_inb_callback()
1377 	if (urb->actual_length != len + 2) {  in digi_read_inb_callback()
1378 		dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",  in digi_read_inb_callback()
1379 			priv->dp_port_num, opcode, len, urb->actual_length);  in digi_read_inb_callback()
1380 		return -1;  in digi_read_inb_callback()
1384 		dev_err(&port->dev, "malformed data packet received\n");  in digi_read_inb_callback()
1385 		return -1;  in digi_read_inb_callback()
1388 	spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_read_inb_callback()
1392 	throttled = priv->dp_throttled;  in digi_read_inb_callback()
1394 		priv->dp_throttle_restart = 1;  in digi_read_inb_callback()
1406 			tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);  in digi_read_inb_callback()
1417 		/* data length is len-1 (one byte of len is port_status) */  in digi_read_inb_callback()
1418 		--len;  in digi_read_inb_callback()
1420 			tty_insert_flip_string_fixed_flag(&port->port, data,  in digi_read_inb_callback()
1422 			tty_flip_buffer_push(&port->port);  in digi_read_inb_callback()
1425 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_read_inb_callback()
1428 		dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);  in digi_read_inb_callback()
1430 		dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);  in digi_read_inb_callback()
1441  *  When called we know port and port->private are not NULL and
1442  *  the port->serial is valid.  It returns 0 if successful, and
1443  *  -1 if the sanity checks failed.
1449 	struct usb_serial_port *port = urb->context;  in digi_read_oob_callback()
1450 	struct usb_serial *serial = port->serial;  in digi_read_oob_callback()
1453 	unsigned char *buf = urb->transfer_buffer;  in digi_read_oob_callback()
1459 	if (urb->actual_length < 4)  in digi_read_oob_callback()
1460 		return -1;  in digi_read_oob_callback()
1463 	for (i = 0; i < urb->actual_length - 3; i += 4) {  in digi_read_oob_callback()
1469 		dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",  in digi_read_oob_callback()
1472 		if (status != 0 || line >= serial->type->num_ports)  in digi_read_oob_callback()
1475 		port = serial->port[line];  in digi_read_oob_callback()
1479 			return -1;  in digi_read_oob_callback()
1481 		tty = tty_port_tty_get(&port->port);  in digi_read_oob_callback()
1490 			spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1493 				priv->dp_modem_signals |= TIOCM_CTS;  in digi_read_oob_callback()
1497 				priv->dp_modem_signals &= ~TIOCM_CTS;  in digi_read_oob_callback()
1501 				priv->dp_modem_signals |= TIOCM_DSR;  in digi_read_oob_callback()
1503 				priv->dp_modem_signals &= ~TIOCM_DSR;  in digi_read_oob_callback()
1505 				priv->dp_modem_signals |= TIOCM_RI;  in digi_read_oob_callback()
1507 				priv->dp_modem_signals &= ~TIOCM_RI;  in digi_read_oob_callback()
1509 				priv->dp_modem_signals |= TIOCM_CD;  in digi_read_oob_callback()
1511 				priv->dp_modem_signals &= ~TIOCM_CD;  in digi_read_oob_callback()
1513 			spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1516 				tty_port_tty_wakeup(&port->port);  in digi_read_oob_callback()
1518 			spin_lock_irqsave(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1519 			priv->dp_transmit_idle = 1;  in digi_read_oob_callback()
1520 			wake_up_interruptible(&priv->dp_transmit_idle_wait);  in digi_read_oob_callback()
1521 			spin_unlock_irqrestore(&priv->dp_port_lock, flags);  in digi_read_oob_callback()
1523 			wake_up_interruptible(&priv->dp_flush_wait);  in digi_read_oob_callback()