2 * usb-serial driver for Quatech USB 2 devices
4 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
11 * These devices all have only 1 bulk in and 1 bulk out that is shared
12 * for all serial ports.
16 #include <asm/unaligned.h>
17 #include <linux/errno.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/tty.h>
21 #include <linux/tty_driver.h>
22 #include <linux/tty_flip.h>
23 #include <linux/module.h>
24 #include <linux/serial.h>
25 #include <linux/usb.h>
26 #include <linux/usb/serial.h>
27 #include <linux/serial_reg.h>
28 #include <linux/uaccess.h>
30 /* default urb timeout for usb operations */
31 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
33 #define QT_OPEN_CLOSE_CHANNEL 0xca
34 #define QT_SET_GET_DEVICE 0xc2
35 #define QT_SET_GET_REGISTER 0xc0
36 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
37 #define QT_SET_ATF 0xcd
38 #define QT_TRANSFER_IN 0xc0
39 #define QT_HW_FLOW_CONTROL_MASK 0xc5
40 #define QT_SW_FLOW_CONTROL_MASK 0xc6
41 #define QT2_BREAK_CONTROL 0xc8
42 #define QT2_GET_SET_UART 0xc1
43 #define QT2_FLUSH_DEVICE 0xc4
44 #define QT2_GET_SET_QMCR 0xe1
45 #define QT2_QMCR_RS232 0x40
46 #define QT2_QMCR_RS422 0x10
48 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
50 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
52 /* status bytes for the device */
53 #define QT2_CONTROL_BYTE 0x1b
54 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
55 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
56 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
57 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
58 #define QT2_REC_FLUSH 0x04 /* no following info */
59 #define QT2_XMIT_FLUSH 0x05 /* no following info */
60 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
62 #define MAX_BAUD_RATE 921600
63 #define DEFAULT_BAUD_RATE 9600
65 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
66 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
68 /* Version Information */
69 #define DRIVER_VERSION "v0.1"
70 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
72 #define USB_VENDOR_ID_QUATECH 0x061d
73 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */
74 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
75 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
76 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */
77 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
78 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
79 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
81 struct qt2_device_detail {
86 #define QT_DETAILS(prod, ports) \
87 .product_id = (prod), \
90 static const struct qt2_device_detail qt2_device_details[] = {
91 {QT_DETAILS(QUATECH_SSU2_100, 1)},
92 {QT_DETAILS(QUATECH_DSU2_400, 2)},
93 {QT_DETAILS(QUATECH_DSU2_100, 2)},
94 {QT_DETAILS(QUATECH_QSU2_400, 4)},
95 {QT_DETAILS(QUATECH_QSU2_100, 4)},
96 {QT_DETAILS(QUATECH_ESU2_400, 8)},
97 {QT_DETAILS(QUATECH_ESU2_100, 8)},
98 {QT_DETAILS(0, 0)} /* Terminating entry */
101 static const struct usb_device_id id_table[] = {
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
108 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
109 {} /* Terminating entry */
111 MODULE_DEVICE_TABLE(usb, id_table);
113 struct qt2_serial_private {
114 unsigned char current_port; /* current port for incoming data */
116 struct urb *read_urb; /* shared among all ports */
117 char read_buffer[512];
120 struct qt2_port_private {
126 struct urb *write_urb;
127 char write_buffer[QT2_WRITE_BUFFER_SIZE];
133 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
134 struct async_icount icount;
136 struct usb_serial_port *port;
139 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
140 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
141 static void qt2_write_bulk_callback(struct urb *urb);
142 static void qt2_read_bulk_callback(struct urb *urb);
144 static void qt2_release(struct usb_serial *serial)
148 kfree(usb_get_serial_data(serial));
150 for (i = 0; i < serial->num_ports; i++)
151 kfree(usb_get_serial_port_data(serial->port[i]));
154 static inline int calc_baud_divisor(int baudrate)
158 divisor = MAX_BAUD_RATE / baudrate;
159 rem = MAX_BAUD_RATE % baudrate;
160 /* Round to nearest divisor */
161 if (((rem * 2) >= baudrate) && (baudrate != 110))
167 static inline int qt2_set_port_config(struct usb_device *dev,
168 unsigned char port_number,
169 u16 baudrate, u16 lcr)
171 int divisor = calc_baud_divisor(baudrate);
172 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
174 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
175 QT2_GET_SET_UART, 0x40,
176 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
179 static inline int qt2_control_msg(struct usb_device *dev,
180 u8 request, u16 data, u16 index)
182 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
183 request, 0x40, data, index,
184 NULL, 0, QT2_USB_TIMEOUT);
187 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
189 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
191 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
195 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
197 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
198 QT_SET_GET_DEVICE, 0xc0, 0, 0,
199 data, 3, QT2_USB_TIMEOUT);
202 static inline int qt2_getregister(struct usb_device *dev,
207 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
208 QT_SET_GET_REGISTER, 0xc0, reg,
209 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
213 static inline int qt2_setregister(struct usb_device *dev,
214 u8 uart, u8 reg, u16 data)
216 u16 value = (data << 8) | reg;
218 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
219 QT_SET_GET_REGISTER, 0x40, value, uart,
220 NULL, 0, QT2_USB_TIMEOUT);
223 static inline int update_mctrl(struct qt2_port_private *port_priv,
224 unsigned int set, unsigned int clear)
226 struct usb_serial_port *port = port_priv->port;
227 struct usb_device *dev = port->serial->dev;
231 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
233 "update_mctrl - DTR|RTS not being set|cleared\n");
234 return 0; /* no change */
237 clear &= ~set; /* 'set' takes precedence over 'clear' */
240 urb_value |= UART_MCR_DTR;
242 urb_value |= UART_MCR_RTS;
244 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
248 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
253 static int qt2_calc_num_ports(struct usb_serial *serial)
255 struct qt2_device_detail d;
258 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
259 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
263 /* we didn't recognize the device */
264 dev_err(&serial->dev->dev,
265 "don't know the number of ports, assuming 1\n");
270 static void qt2_set_termios(struct tty_struct *tty,
271 struct usb_serial_port *port,
272 struct ktermios *old_termios)
274 struct usb_device *dev = port->serial->dev;
275 struct qt2_port_private *port_priv;
276 struct ktermios *termios = &tty->termios;
278 unsigned int cflag = termios->c_cflag;
282 port_priv = usb_get_serial_port_data(port);
284 if (cflag & PARENB) {
286 new_lcr |= UART_LCR_PARITY;
288 new_lcr |= SERIAL_EVEN_PARITY;
291 switch (cflag & CSIZE) {
293 new_lcr |= UART_LCR_WLEN5;
296 new_lcr |= UART_LCR_WLEN6;
299 new_lcr |= UART_LCR_WLEN7;
303 new_lcr |= UART_LCR_WLEN8;
307 baud = tty_get_baud_rate(tty);
311 status = qt2_set_port_config(dev, port_priv->device_port, baud,
314 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
318 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
320 port_priv->device_port);
322 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
323 0, port_priv->device_port);
325 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
328 if (I_IXOFF(tty) || I_IXON(tty)) {
329 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
331 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
332 x, port_priv->device_port);
334 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
335 0, port_priv->device_port);
338 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
343 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
345 struct usb_serial *serial;
346 struct qt2_port_private *port_priv;
352 device_port = (u16) (port->number - port->serial->minor);
354 serial = port->serial;
356 port_priv = usb_get_serial_port_data(port);
358 /* set the port to RS232 mode */
359 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
360 QT2_QMCR_RS232, device_port);
363 "%s failed to set RS232 mode for port %i error %i\n",
364 __func__, device_port, status);
368 data = kzalloc(2, GFP_KERNEL);
373 status = usb_control_msg(serial->dev,
374 usb_rcvctrlpipe(serial->dev, 0),
375 QT_OPEN_CLOSE_CHANNEL,
377 device_port, data, 2, QT2_USB_TIMEOUT);
380 dev_err(&port->dev, "%s - open port failed %i", __func__,
386 spin_lock_irqsave(&port_priv->lock, flags);
387 port_priv->shadowLSR = data[0];
388 port_priv->shadowMSR = data[1];
389 spin_unlock_irqrestore(&port_priv->lock, flags);
393 /* set to default speed and 8bit word size */
394 status = qt2_set_port_config(serial->dev, device_port,
395 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
398 "%s - initial setup failed for port %i (%i)\n",
399 __func__, port->number, device_port);
403 port_priv->is_open = true;
404 port_priv->device_port = (u8) device_port;
407 qt2_set_termios(tty, port, &tty->termios);
413 static void qt2_close(struct usb_serial_port *port)
415 struct usb_serial *serial;
416 struct qt2_port_private *port_priv;
420 serial = port->serial;
421 port_priv = usb_get_serial_port_data(port);
423 port_priv->is_open = false;
425 spin_lock_irqsave(&port_priv->urb_lock, flags);
426 if (port_priv->write_urb->status == -EINPROGRESS)
427 usb_kill_urb(port_priv->write_urb);
428 port_priv->urb_in_use = false;
429 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
431 /* flush the port transmit buffer */
432 i = usb_control_msg(serial->dev,
433 usb_rcvctrlpipe(serial->dev, 0),
434 QT2_FLUSH_DEVICE, 0x40, 1,
435 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
438 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
441 /* flush the port receive buffer */
442 i = usb_control_msg(serial->dev,
443 usb_rcvctrlpipe(serial->dev, 0),
444 QT2_FLUSH_DEVICE, 0x40, 0,
445 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
448 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
452 i = usb_control_msg(serial->dev,
453 usb_sndctrlpipe(serial->dev, 0),
454 QT_OPEN_CLOSE_CHANNEL,
456 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
459 dev_err(&port->dev, "%s - close port failed %i\n",
464 static void qt2_disconnect(struct usb_serial *serial)
466 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
467 struct qt2_port_private *port_priv;
470 if (serial_priv->read_urb->status == -EINPROGRESS)
471 usb_kill_urb(serial_priv->read_urb);
473 usb_free_urb(serial_priv->read_urb);
475 for (i = 0; i < serial->num_ports; i++) {
476 port_priv = usb_get_serial_port_data(serial->port[i]);
478 if (port_priv->write_urb->status == -EINPROGRESS)
479 usb_kill_urb(port_priv->write_urb);
480 usb_free_urb(port_priv->write_urb);
484 static int get_serial_info(struct usb_serial_port *port,
485 struct serial_struct __user *retinfo)
487 struct serial_struct tmp;
492 memset(&tmp, 0, sizeof(tmp));
493 tmp.line = port->serial->minor;
496 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
497 tmp.xmit_fifo_size = port->bulk_out_size;
498 tmp.baud_base = 9600;
499 tmp.close_delay = 5*HZ;
500 tmp.closing_wait = 30*HZ;
502 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
507 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
509 struct qt2_port_private *priv = usb_get_serial_port_data(port);
510 struct async_icount prev, cur;
513 spin_lock_irqsave(&priv->lock, flags);
515 spin_unlock_irqrestore(&priv->lock, flags);
518 wait_event_interruptible(priv->delta_msr_wait,
519 ((priv->icount.rng != prev.rng) ||
520 (priv->icount.dsr != prev.dsr) ||
521 (priv->icount.dcd != prev.dcd) ||
522 (priv->icount.cts != prev.cts)));
524 if (signal_pending(current))
527 spin_lock_irqsave(&priv->lock, flags);
529 spin_unlock_irqrestore(&priv->lock, flags);
531 if ((prev.rng == cur.rng) &&
532 (prev.dsr == cur.dsr) &&
533 (prev.dcd == cur.dcd) &&
534 (prev.cts == cur.cts))
537 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
538 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
539 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
540 (arg & TIOCM_CTS && (prev.cts != cur.cts)))
546 static int qt2_get_icount(struct tty_struct *tty,
547 struct serial_icounter_struct *icount)
549 struct usb_serial_port *port = tty->driver_data;
550 struct qt2_port_private *priv = usb_get_serial_port_data(port);
551 struct async_icount cnow = priv->icount;
553 icount->cts = cnow.cts;
554 icount->dsr = cnow.dsr;
555 icount->rng = cnow.rng;
556 icount->dcd = cnow.dcd;
557 icount->rx = cnow.rx;
558 icount->tx = cnow.tx;
559 icount->frame = cnow.frame;
560 icount->overrun = cnow.overrun;
561 icount->parity = cnow.parity;
562 icount->brk = cnow.brk;
563 icount->buf_overrun = cnow.buf_overrun;
568 static int qt2_ioctl(struct tty_struct *tty,
569 unsigned int cmd, unsigned long arg)
571 struct usb_serial_port *port = tty->driver_data;
575 return get_serial_info(port,
576 (struct serial_struct __user *)arg);
579 return wait_modem_info(port, arg);
588 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
591 case QT2_LINE_STATUS:
592 qt2_update_lsr(port, ch + 1);
594 case QT2_MODEM_STATUS:
595 qt2_update_msr(port, ch + 1);
600 /* not needed, kept to document functionality */
601 static void qt2_process_xmit_empty(struct usb_serial_port *port,
606 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
609 /* not needed, kept to document functionality */
610 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
615 void qt2_process_read_urb(struct urb *urb)
617 struct usb_serial *serial;
618 struct qt2_serial_private *serial_priv;
619 struct usb_serial_port *port;
620 struct qt2_port_private *port_priv;
621 struct tty_struct *tty;
625 unsigned char newport;
626 int len = urb->actual_length;
631 ch = urb->transfer_buffer;
633 serial = urb->context;
634 serial_priv = usb_get_serial_data(serial);
635 port = serial->port[serial_priv->current_port];
636 port_priv = usb_get_serial_port_data(port);
638 if (port_priv->is_open)
639 tty = tty_port_tty_get(&port->port);
641 for (i = 0; i < urb->actual_length; i++) {
642 ch = (unsigned char *)urb->transfer_buffer + i;
643 if ((i <= (len - 3)) &&
644 (*ch == QT2_CONTROL_BYTE) &&
645 (*(ch + 1) == QT2_CONTROL_BYTE)) {
648 case QT2_LINE_STATUS:
649 case QT2_MODEM_STATUS:
652 "%s - status message too short\n",
656 qt2_process_status(port, ch + 2);
663 "%s - xmit_empty message too short\n",
667 qt2_process_xmit_empty(port, ch + 3);
671 case QT2_CHANGE_PORT:
674 "%s - change_port message too short\n",
679 tty_flip_buffer_push(tty);
685 if (newport > serial->num_ports) {
687 "%s - port change to invalid port: %i\n",
692 serial_priv->current_port = newport;
693 port = serial->port[serial_priv->current_port];
694 port_priv = usb_get_serial_port_data(port);
695 if (port_priv->is_open)
696 tty = tty_port_tty_get(&port->port);
704 qt2_process_flush(port, ch + 2);
708 case QT2_CONTROL_ESCAPE:
709 tty_buffer_request_room(tty, 2);
710 tty_insert_flip_string(tty, ch, 2);
716 "%s - unsupported command %i\n",
717 __func__, *(ch + 2));
725 tty_buffer_request_room(tty, 1);
726 tty_insert_flip_string(tty, ch, 1);
731 tty_flip_buffer_push(tty);
736 static void qt2_write_bulk_callback(struct urb *urb)
738 struct usb_serial_port *port;
739 struct qt2_port_private *port_priv;
742 port_priv = usb_get_serial_port_data(port);
744 spin_lock(&port_priv->urb_lock);
746 port_priv->urb_in_use = false;
747 usb_serial_port_softint(port);
749 spin_unlock(&port_priv->urb_lock);
753 static void qt2_read_bulk_callback(struct urb *urb)
755 struct usb_serial *serial = urb->context;
759 dev_warn(&serial->dev->dev,
760 "%s - non-zero urb status: %i\n", __func__,
765 qt2_process_read_urb(urb);
767 status = usb_submit_urb(urb, GFP_ATOMIC);
769 dev_err(&serial->dev->dev,
770 "%s - resubmit read urb failed: %i\n",
774 static int qt2_setup_urbs(struct usb_serial *serial)
776 struct usb_serial_port *port;
777 struct usb_serial_port *port0;
778 struct qt2_serial_private *serial_priv;
779 struct qt2_port_private *port_priv;
782 port0 = serial->port[0];
784 serial_priv = usb_get_serial_data(serial);
785 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
786 if (!serial_priv->read_urb) {
787 dev_err(&serial->dev->dev, "No free urbs available\n");
791 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
792 usb_rcvbulkpipe(serial->dev,
793 port0->bulk_in_endpointAddress),
794 serial_priv->read_buffer,
795 sizeof(serial_priv->read_buffer),
796 qt2_read_bulk_callback, serial);
798 /* setup write_urb for each port */
799 for (pcount = 0; pcount < serial->num_ports; pcount++) {
801 port = serial->port[pcount];
802 port_priv = usb_get_serial_port_data(port);
804 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
805 if (!port_priv->write_urb) {
806 dev_err(&serial->dev->dev,
807 "failed to alloc write_urb for port %i\n",
812 usb_fill_bulk_urb(port_priv->write_urb,
814 usb_sndbulkpipe(serial->dev,
816 bulk_out_endpointAddress),
817 port_priv->write_buffer,
818 sizeof(port_priv->write_buffer),
819 qt2_write_bulk_callback, port);
822 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
824 dev_err(&serial->dev->dev,
825 "%s - submit read urb failed %i\n", __func__, status);
833 static int qt2_attach(struct usb_serial *serial)
835 struct qt2_serial_private *serial_priv;
836 struct qt2_port_private *port_priv;
840 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
841 0xc2, 0x40, 0x8000, 0, NULL, 0,
844 dev_err(&serial->dev->dev,
845 "%s - failed to power on unit: %i\n", __func__, status);
849 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
851 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
855 usb_set_serial_data(serial, serial_priv);
857 for (pcount = 0; pcount < serial->num_ports; pcount++) {
858 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
860 dev_err(&serial->dev->dev,
861 "%s- kmalloc(%Zd) failed.\n", __func__,
868 spin_lock_init(&port_priv->lock);
869 spin_lock_init(&port_priv->urb_lock);
870 init_waitqueue_head(&port_priv->delta_msr_wait);
872 port_priv->port = serial->port[pcount];
874 usb_set_serial_port_data(serial->port[pcount], port_priv);
877 status = qt2_setup_urbs(serial);
884 for (/* empty */; pcount >= 0; pcount--) {
885 port_priv = usb_get_serial_port_data(serial->port[pcount]);
892 static int qt2_tiocmget(struct tty_struct *tty)
894 struct usb_serial_port *port = tty->driver_data;
895 struct usb_device *dev = port->serial->dev;
896 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
900 d = kzalloc(2, GFP_KERNEL);
904 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
908 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
912 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
913 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
914 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
915 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
916 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
917 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
924 static int qt2_tiocmset(struct tty_struct *tty,
925 unsigned int set, unsigned int clear)
927 struct qt2_port_private *port_priv;
929 port_priv = usb_get_serial_port_data(tty->driver_data);
930 return update_mctrl(port_priv, set, clear);
933 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
935 struct usb_serial_port *port = tty->driver_data;
936 struct qt2_port_private *port_priv;
940 port_priv = usb_get_serial_port_data(port);
942 if (!port_priv->is_open) {
944 "%s - port is not open\n", __func__);
948 val = (break_state == -1) ? 1 : 0;
950 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
951 val, port_priv->device_port);
954 "%s - failed to send control message: %i\n", __func__,
960 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
962 struct usb_device *dev = port->serial->dev;
963 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
965 mutex_lock(&port->serial->disc_mutex);
966 if (!port->serial->disconnected) {
967 /* Disable flow control */
968 if (!on && qt2_setregister(dev, port_priv->device_port,
970 dev_warn(&port->dev, "error from flowcontrol urb\n");
971 /* drop RTS and DTR */
973 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
975 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
977 mutex_unlock(&port->serial->disc_mutex);
980 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
982 struct qt2_port_private *port_priv;
983 u8 newMSR = (u8) *ch;
986 port_priv = usb_get_serial_port_data(port);
988 spin_lock_irqsave(&port_priv->lock, flags);
989 port_priv->shadowMSR = newMSR;
990 spin_unlock_irqrestore(&port_priv->lock, flags);
992 if (newMSR & UART_MSR_ANY_DELTA) {
993 /* update input line counters */
994 if (newMSR & UART_MSR_DCTS)
995 port_priv->icount.cts++;
997 if (newMSR & UART_MSR_DDSR)
998 port_priv->icount.dsr++;
1000 if (newMSR & UART_MSR_DDCD)
1001 port_priv->icount.dcd++;
1003 if (newMSR & UART_MSR_TERI)
1004 port_priv->icount.rng++;
1006 wake_up_interruptible(&port_priv->delta_msr_wait);
1010 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
1012 struct qt2_port_private *port_priv;
1013 struct async_icount *icount;
1014 unsigned long flags;
1015 u8 newLSR = (u8) *ch;
1017 port_priv = usb_get_serial_port_data(port);
1019 if (newLSR & UART_LSR_BI)
1020 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1022 spin_lock_irqsave(&port_priv->lock, flags);
1023 port_priv->shadowLSR = newLSR;
1024 spin_unlock_irqrestore(&port_priv->lock, flags);
1026 icount = &port_priv->icount;
1028 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1030 if (newLSR & UART_LSR_BI)
1033 if (newLSR & UART_LSR_OE)
1036 if (newLSR & UART_LSR_PE)
1039 if (newLSR & UART_LSR_FE)
1045 static int qt2_write_room(struct tty_struct *tty)
1047 struct usb_serial_port *port = tty->driver_data;
1048 struct qt2_port_private *port_priv;
1049 unsigned long flags = 0;
1052 port_priv = usb_get_serial_port_data(port);
1054 spin_lock_irqsave(&port_priv->urb_lock, flags);
1056 if (port_priv->urb_in_use)
1059 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1061 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1066 static int qt2_write(struct tty_struct *tty,
1067 struct usb_serial_port *port,
1068 const unsigned char *buf, int count)
1070 struct qt2_port_private *port_priv;
1071 struct urb *write_urb;
1072 unsigned char *data;
1073 unsigned long flags;
1077 port_priv = usb_get_serial_port_data(port);
1079 if (port_priv->write_urb == NULL) {
1080 dev_err(&port->dev, "%s - no output urb\n", __func__);
1083 write_urb = port_priv->write_urb;
1085 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1087 data = write_urb->transfer_buffer;
1088 spin_lock_irqsave(&port_priv->urb_lock, flags);
1089 if (port_priv->urb_in_use == true) {
1090 dev_err(&port->dev, "qt2_write - urb is in use\n");
1094 *data++ = QT2_CONTROL_BYTE;
1095 *data++ = QT2_CONTROL_BYTE;
1096 *data++ = port_priv->device_port;
1097 put_unaligned_le16(count, data);
1099 memcpy(data, buf, count);
1101 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1103 status = usb_submit_urb(write_urb, GFP_ATOMIC);
1105 port_priv->urb_in_use = true;
1110 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1115 static struct usb_serial_driver qt2_device = {
1117 .owner = THIS_MODULE,
1118 .name = "quatech-serial",
1120 .description = DRIVER_DESC,
1121 .id_table = id_table,
1125 .write_room = qt2_write_room,
1126 .calc_num_ports = qt2_calc_num_ports,
1127 .attach = qt2_attach,
1128 .release = qt2_release,
1129 .disconnect = qt2_disconnect,
1130 .dtr_rts = qt2_dtr_rts,
1131 .break_ctl = qt2_break_ctl,
1132 .tiocmget = qt2_tiocmget,
1133 .tiocmset = qt2_tiocmset,
1134 .get_icount = qt2_get_icount,
1136 .set_termios = qt2_set_termios,
1139 static struct usb_serial_driver *const serial_drivers[] = {
1143 module_usb_serial_driver(serial_drivers, id_table);
1145 MODULE_DESCRIPTION(DRIVER_DESC);
1146 MODULE_LICENSE("GPL");