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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * usb-serial driver for Quatech USB 2 devices
4 *
5 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
6 *
7 * These devices all have only 1 bulk in and 1 bulk out that is shared
8 * for all serial ports.
9 *
10 */
11
12#include <asm/unaligned.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15#include <linux/tty.h>
16#include <linux/tty_driver.h>
17#include <linux/tty_flip.h>
18#include <linux/module.h>
19#include <linux/serial.h>
20#include <linux/usb.h>
21#include <linux/usb/serial.h>
22#include <linux/serial_reg.h>
23#include <linux/uaccess.h>
24
25/* default urb timeout for usb operations */
26#define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
27
28#define QT_OPEN_CLOSE_CHANNEL 0xca
29#define QT_SET_GET_DEVICE 0xc2
30#define QT_SET_GET_REGISTER 0xc0
31#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
32#define QT_SET_ATF 0xcd
33#define QT_TRANSFER_IN 0xc0
34#define QT_HW_FLOW_CONTROL_MASK 0xc5
35#define QT_SW_FLOW_CONTROL_MASK 0xc6
36#define QT2_BREAK_CONTROL 0xc8
37#define QT2_GET_SET_UART 0xc1
38#define QT2_FLUSH_DEVICE 0xc4
39#define QT2_GET_SET_QMCR 0xe1
40#define QT2_QMCR_RS232 0x40
41#define QT2_QMCR_RS422 0x10
42
43#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
44
45#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
46
47/* status bytes for the device */
48#define QT2_CONTROL_BYTE 0x1b
49#define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
50#define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
51#define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
52#define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
53#define QT2_REC_FLUSH 0x04 /* no following info */
54#define QT2_XMIT_FLUSH 0x05 /* no following info */
55#define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
56
57#define MAX_BAUD_RATE 921600
58#define DEFAULT_BAUD_RATE 9600
59
60#define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */
61#define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
62#define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
63
64#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
65
66#define USB_VENDOR_ID_QUATECH 0x061d
67#define QUATECH_SSU2_100 0xC120 /* RS232 single port */
68#define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
69#define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
70#define QUATECH_QSU2_100 0xC160 /* RS232 four port */
71#define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
72#define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
73#define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
74
75struct qt2_device_detail {
76 int product_id;
77 int num_ports;
78};
79
80#define QT_DETAILS(prod, ports) \
81 .product_id = (prod), \
82 .num_ports = (ports)
83
84static const struct qt2_device_detail qt2_device_details[] = {
85 {QT_DETAILS(QUATECH_SSU2_100, 1)},
86 {QT_DETAILS(QUATECH_DSU2_400, 2)},
87 {QT_DETAILS(QUATECH_DSU2_100, 2)},
88 {QT_DETAILS(QUATECH_QSU2_400, 4)},
89 {QT_DETAILS(QUATECH_QSU2_100, 4)},
90 {QT_DETAILS(QUATECH_ESU2_400, 8)},
91 {QT_DETAILS(QUATECH_ESU2_100, 8)},
92 {QT_DETAILS(0, 0)} /* Terminating entry */
93};
94
95static const struct usb_device_id id_table[] = {
96 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
97 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
98 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
99 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
103 {} /* Terminating entry */
104};
105MODULE_DEVICE_TABLE(usb, id_table);
106
107struct qt2_serial_private {
108 unsigned char current_port; /* current port for incoming data */
109
110 struct urb *read_urb; /* shared among all ports */
111 char *read_buffer;
112};
113
114struct qt2_port_private {
115 u8 device_port;
116
117 spinlock_t urb_lock;
118 bool urb_in_use;
119 struct urb *write_urb;
120 char *write_buffer;
121
122 spinlock_t lock;
123 u8 shadowLSR;
124 u8 shadowMSR;
125
126 struct usb_serial_port *port;
127};
128
129static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
130static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
131static void qt2_write_bulk_callback(struct urb *urb);
132static void qt2_read_bulk_callback(struct urb *urb);
133
134static void qt2_release(struct usb_serial *serial)
135{
136 struct qt2_serial_private *serial_priv;
137
138 serial_priv = usb_get_serial_data(serial);
139
140 usb_kill_urb(serial_priv->read_urb);
141 usb_free_urb(serial_priv->read_urb);
142 kfree(serial_priv->read_buffer);
143 kfree(serial_priv);
144}
145
146static inline int calc_baud_divisor(int baudrate)
147{
148 int divisor, rem;
149
150 divisor = MAX_BAUD_RATE / baudrate;
151 rem = MAX_BAUD_RATE % baudrate;
152 /* Round to nearest divisor */
153 if (((rem * 2) >= baudrate) && (baudrate != 110))
154 divisor++;
155
156 return divisor;
157}
158
159static inline int qt2_set_port_config(struct usb_device *dev,
160 unsigned char port_number,
161 u16 baudrate, u16 lcr)
162{
163 int divisor = calc_baud_divisor(baudrate);
164 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
165
166 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
167 QT2_GET_SET_UART, 0x40,
168 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
169}
170
171static inline int qt2_control_msg(struct usb_device *dev,
172 u8 request, u16 data, u16 index)
173{
174 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
175 request, 0x40, data, index,
176 NULL, 0, QT2_USB_TIMEOUT);
177}
178
179static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
180{
181 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
182
183 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
184}
185
186
187static inline int qt2_getregister(struct usb_device *dev,
188 u8 uart,
189 u8 reg,
190 u8 *data)
191{
192 int ret;
193
194 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
195 QT_SET_GET_REGISTER, 0xc0, reg,
196 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
197 if (ret < (int)sizeof(*data)) {
198 if (ret >= 0)
199 ret = -EIO;
200 }
201
202 return ret;
203}
204
205static inline int qt2_setregister(struct usb_device *dev,
206 u8 uart, u8 reg, u16 data)
207{
208 u16 value = (data << 8) | reg;
209
210 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
211 QT_SET_GET_REGISTER, 0x40, value, uart,
212 NULL, 0, QT2_USB_TIMEOUT);
213}
214
215static inline int update_mctrl(struct qt2_port_private *port_priv,
216 unsigned int set, unsigned int clear)
217{
218 struct usb_serial_port *port = port_priv->port;
219 struct usb_device *dev = port->serial->dev;
220 unsigned urb_value;
221 int status;
222
223 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
224 dev_dbg(&port->dev,
225 "update_mctrl - DTR|RTS not being set|cleared\n");
226 return 0; /* no change */
227 }
228
229 clear &= ~set; /* 'set' takes precedence over 'clear' */
230 urb_value = 0;
231 if (set & TIOCM_DTR)
232 urb_value |= UART_MCR_DTR;
233 if (set & TIOCM_RTS)
234 urb_value |= UART_MCR_RTS;
235
236 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
237 urb_value);
238 if (status < 0)
239 dev_err(&port->dev,
240 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
241 status);
242 return status;
243}
244
245static int qt2_calc_num_ports(struct usb_serial *serial,
246 struct usb_serial_endpoints *epds)
247{
248 struct qt2_device_detail d;
249 int i;
250
251 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
252 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
253 return d.num_ports;
254 }
255
256 /* we didn't recognize the device */
257 dev_err(&serial->dev->dev,
258 "don't know the number of ports, assuming 1\n");
259
260 return 1;
261}
262
263static void qt2_set_termios(struct tty_struct *tty,
264 struct usb_serial_port *port,
265 struct ktermios *old_termios)
266{
267 struct usb_device *dev = port->serial->dev;
268 struct qt2_port_private *port_priv;
269 struct ktermios *termios = &tty->termios;
270 u16 baud;
271 unsigned int cflag = termios->c_cflag;
272 u16 new_lcr = 0;
273 int status;
274
275 port_priv = usb_get_serial_port_data(port);
276
277 if (cflag & PARENB) {
278 if (cflag & PARODD)
279 new_lcr |= UART_LCR_PARITY;
280 else
281 new_lcr |= SERIAL_EVEN_PARITY;
282 }
283
284 switch (cflag & CSIZE) {
285 case CS5:
286 new_lcr |= UART_LCR_WLEN5;
287 break;
288 case CS6:
289 new_lcr |= UART_LCR_WLEN6;
290 break;
291 case CS7:
292 new_lcr |= UART_LCR_WLEN7;
293 break;
294 default:
295 case CS8:
296 new_lcr |= UART_LCR_WLEN8;
297 break;
298 }
299
300 baud = tty_get_baud_rate(tty);
301 if (!baud)
302 baud = 9600;
303
304 status = qt2_set_port_config(dev, port_priv->device_port, baud,
305 new_lcr);
306 if (status < 0)
307 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
308 __func__, status);
309
310 if (cflag & CRTSCTS)
311 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
312 SERIAL_CRTSCTS,
313 port_priv->device_port);
314 else
315 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
316 0, port_priv->device_port);
317 if (status < 0)
318 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
319 __func__, status);
320
321 if (I_IXOFF(tty) || I_IXON(tty)) {
322 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
323
324 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
325 x, port_priv->device_port);
326 } else
327 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
328 0, port_priv->device_port);
329
330 if (status < 0)
331 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
332 __func__, status);
333
334}
335
336static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
337{
338 struct usb_serial *serial;
339 struct qt2_port_private *port_priv;
340 u8 *data;
341 u16 device_port;
342 int status;
343 unsigned long flags;
344
345 device_port = port->port_number;
346
347 serial = port->serial;
348
349 port_priv = usb_get_serial_port_data(port);
350
351 /* set the port to RS232 mode */
352 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
353 QT2_QMCR_RS232, device_port);
354 if (status < 0) {
355 dev_err(&port->dev,
356 "%s failed to set RS232 mode for port %i error %i\n",
357 __func__, device_port, status);
358 return status;
359 }
360
361 data = kzalloc(2, GFP_KERNEL);
362 if (!data)
363 return -ENOMEM;
364
365 /* open the port */
366 status = usb_control_msg(serial->dev,
367 usb_rcvctrlpipe(serial->dev, 0),
368 QT_OPEN_CLOSE_CHANNEL,
369 0xc0, 0,
370 device_port, data, 2, QT2_USB_TIMEOUT);
371
372 if (status < 2) {
373 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
374 status);
375 if (status >= 0)
376 status = -EIO;
377 kfree(data);
378 return status;
379 }
380
381 spin_lock_irqsave(&port_priv->lock, flags);
382 port_priv->shadowLSR = data[0];
383 port_priv->shadowMSR = data[1];
384 spin_unlock_irqrestore(&port_priv->lock, flags);
385
386 kfree(data);
387
388 /* set to default speed and 8bit word size */
389 status = qt2_set_port_config(serial->dev, device_port,
390 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
391 if (status < 0) {
392 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
393 __func__, device_port);
394 return status;
395 }
396
397 port_priv->device_port = (u8) device_port;
398
399 if (tty)
400 qt2_set_termios(tty, port, &tty->termios);
401
402 return 0;
403
404}
405
406static void qt2_close(struct usb_serial_port *port)
407{
408 struct usb_serial *serial;
409 struct qt2_port_private *port_priv;
410 int i;
411
412 serial = port->serial;
413 port_priv = usb_get_serial_port_data(port);
414
415 usb_kill_urb(port_priv->write_urb);
416
417 /* flush the port transmit buffer */
418 i = usb_control_msg(serial->dev,
419 usb_rcvctrlpipe(serial->dev, 0),
420 QT2_FLUSH_DEVICE, 0x40, 1,
421 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
422
423 if (i < 0)
424 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
425 __func__, i);
426
427 /* flush the port receive buffer */
428 i = usb_control_msg(serial->dev,
429 usb_rcvctrlpipe(serial->dev, 0),
430 QT2_FLUSH_DEVICE, 0x40, 0,
431 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
432
433 if (i < 0)
434 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
435 __func__, i);
436
437 /* close the port */
438 i = usb_control_msg(serial->dev,
439 usb_sndctrlpipe(serial->dev, 0),
440 QT_OPEN_CLOSE_CHANNEL,
441 0x40, 0,
442 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
443
444 if (i < 0)
445 dev_err(&port->dev, "%s - close port failed %i\n",
446 __func__, i);
447}
448
449static void qt2_disconnect(struct usb_serial *serial)
450{
451 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
452
453 usb_kill_urb(serial_priv->read_urb);
454}
455
456static int get_serial_info(struct tty_struct *tty,
457 struct serial_struct *ss)
458{
459 struct usb_serial_port *port = tty->driver_data;
460
461 ss->line = port->minor;
462 ss->port = 0;
463 ss->irq = 0;
464 ss->xmit_fifo_size = port->bulk_out_size;
465 ss->baud_base = 9600;
466 ss->close_delay = 5*HZ;
467 ss->closing_wait = 30*HZ;
468 return 0;
469}
470
471static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
472{
473 switch (*ch) {
474 case QT2_LINE_STATUS:
475 qt2_update_lsr(port, ch + 1);
476 break;
477 case QT2_MODEM_STATUS:
478 qt2_update_msr(port, ch + 1);
479 break;
480 }
481}
482
483static void qt2_process_read_urb(struct urb *urb)
484{
485 struct usb_serial *serial;
486 struct qt2_serial_private *serial_priv;
487 struct usb_serial_port *port;
488 bool escapeflag;
489 unsigned char *ch;
490 int i;
491 unsigned char newport;
492 int len = urb->actual_length;
493
494 if (!len)
495 return;
496
497 ch = urb->transfer_buffer;
498 serial = urb->context;
499 serial_priv = usb_get_serial_data(serial);
500 port = serial->port[serial_priv->current_port];
501
502 for (i = 0; i < urb->actual_length; i++) {
503 ch = (unsigned char *)urb->transfer_buffer + i;
504 if ((i <= (len - 3)) &&
505 (*ch == QT2_CONTROL_BYTE) &&
506 (*(ch + 1) == QT2_CONTROL_BYTE)) {
507 escapeflag = false;
508 switch (*(ch + 2)) {
509 case QT2_LINE_STATUS:
510 case QT2_MODEM_STATUS:
511 if (i > (len - 4)) {
512 dev_warn(&port->dev,
513 "%s - status message too short\n",
514 __func__);
515 break;
516 }
517 qt2_process_status(port, ch + 2);
518 i += 3;
519 escapeflag = true;
520 break;
521 case QT2_XMIT_HOLD:
522 if (i > (len - 5)) {
523 dev_warn(&port->dev,
524 "%s - xmit_empty message too short\n",
525 __func__);
526 break;
527 }
528 /* bytes_written = (ch[1] << 4) + ch[0]; */
529 i += 4;
530 escapeflag = true;
531 break;
532 case QT2_CHANGE_PORT:
533 if (i > (len - 4)) {
534 dev_warn(&port->dev,
535 "%s - change_port message too short\n",
536 __func__);
537 break;
538 }
539 tty_flip_buffer_push(&port->port);
540
541 newport = *(ch + 3);
542
543 if (newport > serial->num_ports) {
544 dev_err(&port->dev,
545 "%s - port change to invalid port: %i\n",
546 __func__, newport);
547 break;
548 }
549
550 serial_priv->current_port = newport;
551 port = serial->port[serial_priv->current_port];
552 i += 3;
553 escapeflag = true;
554 break;
555 case QT2_REC_FLUSH:
556 case QT2_XMIT_FLUSH:
557 i += 2;
558 escapeflag = true;
559 break;
560 case QT2_CONTROL_ESCAPE:
561 tty_insert_flip_string(&port->port, ch, 2);
562 i += 2;
563 escapeflag = true;
564 break;
565 default:
566 dev_warn(&port->dev,
567 "%s - unsupported command %i\n",
568 __func__, *(ch + 2));
569 break;
570 }
571 if (escapeflag)
572 continue;
573 }
574
575 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
576 }
577
578 tty_flip_buffer_push(&port->port);
579}
580
581static void qt2_write_bulk_callback(struct urb *urb)
582{
583 struct usb_serial_port *port;
584 struct qt2_port_private *port_priv;
585 unsigned long flags;
586
587 port = urb->context;
588 port_priv = usb_get_serial_port_data(port);
589
590 spin_lock_irqsave(&port_priv->urb_lock, flags);
591
592 port_priv->urb_in_use = false;
593 usb_serial_port_softint(port);
594
595 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
596
597}
598
599static void qt2_read_bulk_callback(struct urb *urb)
600{
601 struct usb_serial *serial = urb->context;
602 int status;
603
604 if (urb->status) {
605 dev_warn(&serial->dev->dev,
606 "%s - non-zero urb status: %i\n", __func__,
607 urb->status);
608 return;
609 }
610
611 qt2_process_read_urb(urb);
612
613 status = usb_submit_urb(urb, GFP_ATOMIC);
614 if (status != 0)
615 dev_err(&serial->dev->dev,
616 "%s - resubmit read urb failed: %i\n",
617 __func__, status);
618}
619
620static int qt2_setup_urbs(struct usb_serial *serial)
621{
622 struct usb_serial_port *port0;
623 struct qt2_serial_private *serial_priv;
624 int status;
625
626 port0 = serial->port[0];
627
628 serial_priv = usb_get_serial_data(serial);
629 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
630 if (!serial_priv->read_urb)
631 return -ENOMEM;
632
633 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
634 usb_rcvbulkpipe(serial->dev,
635 port0->bulk_in_endpointAddress),
636 serial_priv->read_buffer,
637 QT2_READ_BUFFER_SIZE,
638 qt2_read_bulk_callback, serial);
639
640 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
641 if (status != 0) {
642 dev_err(&serial->dev->dev,
643 "%s - submit read urb failed %i\n", __func__, status);
644 usb_free_urb(serial_priv->read_urb);
645 return status;
646 }
647
648 return 0;
649}
650
651static int qt2_attach(struct usb_serial *serial)
652{
653 struct qt2_serial_private *serial_priv;
654 int status;
655
656 /* power on unit */
657 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
658 0xc2, 0x40, 0x8000, 0, NULL, 0,
659 QT2_USB_TIMEOUT);
660 if (status < 0) {
661 dev_err(&serial->dev->dev,
662 "%s - failed to power on unit: %i\n", __func__, status);
663 return status;
664 }
665
666 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
667 if (!serial_priv)
668 return -ENOMEM;
669
670 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
671 if (!serial_priv->read_buffer) {
672 status = -ENOMEM;
673 goto err_buf;
674 }
675
676 usb_set_serial_data(serial, serial_priv);
677
678 status = qt2_setup_urbs(serial);
679 if (status != 0)
680 goto attach_failed;
681
682 return 0;
683
684attach_failed:
685 kfree(serial_priv->read_buffer);
686err_buf:
687 kfree(serial_priv);
688 return status;
689}
690
691static int qt2_port_probe(struct usb_serial_port *port)
692{
693 struct usb_serial *serial = port->serial;
694 struct qt2_port_private *port_priv;
695 u8 bEndpointAddress;
696
697 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
698 if (!port_priv)
699 return -ENOMEM;
700
701 spin_lock_init(&port_priv->lock);
702 spin_lock_init(&port_priv->urb_lock);
703 port_priv->port = port;
704
705 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
706 if (!port_priv->write_buffer)
707 goto err_buf;
708
709 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
710 if (!port_priv->write_urb)
711 goto err_urb;
712
713 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
714 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
715 usb_sndbulkpipe(serial->dev, bEndpointAddress),
716 port_priv->write_buffer,
717 QT2_WRITE_BUFFER_SIZE,
718 qt2_write_bulk_callback, port);
719
720 usb_set_serial_port_data(port, port_priv);
721
722 return 0;
723err_urb:
724 kfree(port_priv->write_buffer);
725err_buf:
726 kfree(port_priv);
727 return -ENOMEM;
728}
729
730static int qt2_port_remove(struct usb_serial_port *port)
731{
732 struct qt2_port_private *port_priv;
733
734 port_priv = usb_get_serial_port_data(port);
735 usb_free_urb(port_priv->write_urb);
736 kfree(port_priv->write_buffer);
737 kfree(port_priv);
738
739 return 0;
740}
741
742static int qt2_tiocmget(struct tty_struct *tty)
743{
744 struct usb_serial_port *port = tty->driver_data;
745 struct usb_device *dev = port->serial->dev;
746 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
747 u8 *d;
748 int r;
749
750 d = kzalloc(2, GFP_KERNEL);
751 if (!d)
752 return -ENOMEM;
753
754 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
755 if (r < 0)
756 goto mget_out;
757
758 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
759 if (r < 0)
760 goto mget_out;
761
762 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
763 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
764 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
765 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
766 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
767 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
768
769mget_out:
770 kfree(d);
771 return r;
772}
773
774static int qt2_tiocmset(struct tty_struct *tty,
775 unsigned int set, unsigned int clear)
776{
777 struct qt2_port_private *port_priv;
778
779 port_priv = usb_get_serial_port_data(tty->driver_data);
780 return update_mctrl(port_priv, set, clear);
781}
782
783static void qt2_break_ctl(struct tty_struct *tty, int break_state)
784{
785 struct usb_serial_port *port = tty->driver_data;
786 struct qt2_port_private *port_priv;
787 int status;
788 u16 val;
789
790 port_priv = usb_get_serial_port_data(port);
791
792 val = (break_state == -1) ? 1 : 0;
793
794 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
795 val, port_priv->device_port);
796 if (status < 0)
797 dev_warn(&port->dev,
798 "%s - failed to send control message: %i\n", __func__,
799 status);
800}
801
802
803
804static void qt2_dtr_rts(struct usb_serial_port *port, int on)
805{
806 struct usb_device *dev = port->serial->dev;
807 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
808
809 /* Disable flow control */
810 if (!on) {
811 if (qt2_setregister(dev, port_priv->device_port,
812 UART_MCR, 0) < 0)
813 dev_warn(&port->dev, "error from flowcontrol urb\n");
814 }
815 /* drop RTS and DTR */
816 if (on)
817 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
818 else
819 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
820}
821
822static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
823{
824 struct qt2_port_private *port_priv;
825 u8 newMSR = (u8) *ch;
826 unsigned long flags;
827
828 /* May be called from qt2_process_read_urb() for an unbound port. */
829 port_priv = usb_get_serial_port_data(port);
830 if (!port_priv)
831 return;
832
833 spin_lock_irqsave(&port_priv->lock, flags);
834 port_priv->shadowMSR = newMSR;
835 spin_unlock_irqrestore(&port_priv->lock, flags);
836
837 if (newMSR & UART_MSR_ANY_DELTA) {
838 /* update input line counters */
839 if (newMSR & UART_MSR_DCTS)
840 port->icount.cts++;
841 if (newMSR & UART_MSR_DDSR)
842 port->icount.dsr++;
843 if (newMSR & UART_MSR_DDCD)
844 port->icount.dcd++;
845 if (newMSR & UART_MSR_TERI)
846 port->icount.rng++;
847
848 wake_up_interruptible(&port->port.delta_msr_wait);
849 }
850}
851
852static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
853{
854 struct qt2_port_private *port_priv;
855 struct async_icount *icount;
856 unsigned long flags;
857 u8 newLSR = (u8) *ch;
858
859 /* May be called from qt2_process_read_urb() for an unbound port. */
860 port_priv = usb_get_serial_port_data(port);
861 if (!port_priv)
862 return;
863
864 if (newLSR & UART_LSR_BI)
865 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
866
867 spin_lock_irqsave(&port_priv->lock, flags);
868 port_priv->shadowLSR = newLSR;
869 spin_unlock_irqrestore(&port_priv->lock, flags);
870
871 icount = &port->icount;
872
873 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
874
875 if (newLSR & UART_LSR_BI)
876 icount->brk++;
877
878 if (newLSR & UART_LSR_OE)
879 icount->overrun++;
880
881 if (newLSR & UART_LSR_PE)
882 icount->parity++;
883
884 if (newLSR & UART_LSR_FE)
885 icount->frame++;
886 }
887
888}
889
890static int qt2_write_room(struct tty_struct *tty)
891{
892 struct usb_serial_port *port = tty->driver_data;
893 struct qt2_port_private *port_priv;
894 unsigned long flags = 0;
895 int r;
896
897 port_priv = usb_get_serial_port_data(port);
898
899 spin_lock_irqsave(&port_priv->urb_lock, flags);
900
901 if (port_priv->urb_in_use)
902 r = 0;
903 else
904 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
905
906 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
907
908 return r;
909}
910
911static int qt2_write(struct tty_struct *tty,
912 struct usb_serial_port *port,
913 const unsigned char *buf, int count)
914{
915 struct qt2_port_private *port_priv;
916 struct urb *write_urb;
917 unsigned char *data;
918 unsigned long flags;
919 int status;
920 int bytes_out = 0;
921
922 port_priv = usb_get_serial_port_data(port);
923
924 if (port_priv->write_urb == NULL) {
925 dev_err(&port->dev, "%s - no output urb\n", __func__);
926 return 0;
927 }
928 write_urb = port_priv->write_urb;
929
930 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
931
932 data = write_urb->transfer_buffer;
933 spin_lock_irqsave(&port_priv->urb_lock, flags);
934 if (port_priv->urb_in_use) {
935 dev_err(&port->dev, "qt2_write - urb is in use\n");
936 goto write_out;
937 }
938
939 *data++ = QT2_CONTROL_BYTE;
940 *data++ = QT2_CONTROL_BYTE;
941 *data++ = port_priv->device_port;
942 put_unaligned_le16(count, data);
943 data += 2;
944 memcpy(data, buf, count);
945
946 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
947
948 status = usb_submit_urb(write_urb, GFP_ATOMIC);
949 if (status == 0) {
950 port_priv->urb_in_use = true;
951 bytes_out += count;
952 }
953
954write_out:
955 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
956 return bytes_out;
957}
958
959
960static struct usb_serial_driver qt2_device = {
961 .driver = {
962 .owner = THIS_MODULE,
963 .name = "quatech-serial",
964 },
965 .description = DRIVER_DESC,
966 .id_table = id_table,
967 .open = qt2_open,
968 .close = qt2_close,
969 .write = qt2_write,
970 .write_room = qt2_write_room,
971 .calc_num_ports = qt2_calc_num_ports,
972 .attach = qt2_attach,
973 .release = qt2_release,
974 .disconnect = qt2_disconnect,
975 .port_probe = qt2_port_probe,
976 .port_remove = qt2_port_remove,
977 .dtr_rts = qt2_dtr_rts,
978 .break_ctl = qt2_break_ctl,
979 .tiocmget = qt2_tiocmget,
980 .tiocmset = qt2_tiocmset,
981 .tiocmiwait = usb_serial_generic_tiocmiwait,
982 .get_icount = usb_serial_generic_get_icount,
983 .get_serial = get_serial_info,
984 .set_termios = qt2_set_termios,
985};
986
987static struct usb_serial_driver *const serial_drivers[] = {
988 &qt2_device, NULL
989};
990
991module_usb_serial_driver(serial_drivers, id_table);
992
993MODULE_DESCRIPTION(DRIVER_DESC);
994MODULE_LICENSE("GPL v2");