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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
483/* not needed, kept to document functionality */
484static void qt2_process_xmit_empty(struct usb_serial_port *port,
485 unsigned char *ch)
486{
487 int bytes_written;
488
489 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
490}
491
492/* not needed, kept to document functionality */
493static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
494{
495 return;
496}
497
498static void qt2_process_read_urb(struct urb *urb)
499{
500 struct usb_serial *serial;
501 struct qt2_serial_private *serial_priv;
502 struct usb_serial_port *port;
503 bool escapeflag;
504 unsigned char *ch;
505 int i;
506 unsigned char newport;
507 int len = urb->actual_length;
508
509 if (!len)
510 return;
511
512 ch = urb->transfer_buffer;
513 serial = urb->context;
514 serial_priv = usb_get_serial_data(serial);
515 port = serial->port[serial_priv->current_port];
516
517 for (i = 0; i < urb->actual_length; i++) {
518 ch = (unsigned char *)urb->transfer_buffer + i;
519 if ((i <= (len - 3)) &&
520 (*ch == QT2_CONTROL_BYTE) &&
521 (*(ch + 1) == QT2_CONTROL_BYTE)) {
522 escapeflag = false;
523 switch (*(ch + 2)) {
524 case QT2_LINE_STATUS:
525 case QT2_MODEM_STATUS:
526 if (i > (len - 4)) {
527 dev_warn(&port->dev,
528 "%s - status message too short\n",
529 __func__);
530 break;
531 }
532 qt2_process_status(port, ch + 2);
533 i += 3;
534 escapeflag = true;
535 break;
536 case QT2_XMIT_HOLD:
537 if (i > (len - 5)) {
538 dev_warn(&port->dev,
539 "%s - xmit_empty message too short\n",
540 __func__);
541 break;
542 }
543 qt2_process_xmit_empty(port, ch + 3);
544 i += 4;
545 escapeflag = true;
546 break;
547 case QT2_CHANGE_PORT:
548 if (i > (len - 4)) {
549 dev_warn(&port->dev,
550 "%s - change_port message too short\n",
551 __func__);
552 break;
553 }
554 tty_flip_buffer_push(&port->port);
555
556 newport = *(ch + 3);
557
558 if (newport > serial->num_ports) {
559 dev_err(&port->dev,
560 "%s - port change to invalid port: %i\n",
561 __func__, newport);
562 break;
563 }
564
565 serial_priv->current_port = newport;
566 port = serial->port[serial_priv->current_port];
567 i += 3;
568 escapeflag = true;
569 break;
570 case QT2_REC_FLUSH:
571 case QT2_XMIT_FLUSH:
572 qt2_process_flush(port, ch + 2);
573 i += 2;
574 escapeflag = true;
575 break;
576 case QT2_CONTROL_ESCAPE:
577 tty_insert_flip_string(&port->port, ch, 2);
578 i += 2;
579 escapeflag = true;
580 break;
581 default:
582 dev_warn(&port->dev,
583 "%s - unsupported command %i\n",
584 __func__, *(ch + 2));
585 break;
586 }
587 if (escapeflag)
588 continue;
589 }
590
591 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
592 }
593
594 tty_flip_buffer_push(&port->port);
595}
596
597static void qt2_write_bulk_callback(struct urb *urb)
598{
599 struct usb_serial_port *port;
600 struct qt2_port_private *port_priv;
601 unsigned long flags;
602
603 port = urb->context;
604 port_priv = usb_get_serial_port_data(port);
605
606 spin_lock_irqsave(&port_priv->urb_lock, flags);
607
608 port_priv->urb_in_use = false;
609 usb_serial_port_softint(port);
610
611 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
612
613}
614
615static void qt2_read_bulk_callback(struct urb *urb)
616{
617 struct usb_serial *serial = urb->context;
618 int status;
619
620 if (urb->status) {
621 dev_warn(&serial->dev->dev,
622 "%s - non-zero urb status: %i\n", __func__,
623 urb->status);
624 return;
625 }
626
627 qt2_process_read_urb(urb);
628
629 status = usb_submit_urb(urb, GFP_ATOMIC);
630 if (status != 0)
631 dev_err(&serial->dev->dev,
632 "%s - resubmit read urb failed: %i\n",
633 __func__, status);
634}
635
636static int qt2_setup_urbs(struct usb_serial *serial)
637{
638 struct usb_serial_port *port0;
639 struct qt2_serial_private *serial_priv;
640 int status;
641
642 port0 = serial->port[0];
643
644 serial_priv = usb_get_serial_data(serial);
645 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
646 if (!serial_priv->read_urb)
647 return -ENOMEM;
648
649 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
650 usb_rcvbulkpipe(serial->dev,
651 port0->bulk_in_endpointAddress),
652 serial_priv->read_buffer,
653 QT2_READ_BUFFER_SIZE,
654 qt2_read_bulk_callback, serial);
655
656 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
657 if (status != 0) {
658 dev_err(&serial->dev->dev,
659 "%s - submit read urb failed %i\n", __func__, status);
660 usb_free_urb(serial_priv->read_urb);
661 return status;
662 }
663
664 return 0;
665}
666
667static int qt2_attach(struct usb_serial *serial)
668{
669 struct qt2_serial_private *serial_priv;
670 int status;
671
672 /* power on unit */
673 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
674 0xc2, 0x40, 0x8000, 0, NULL, 0,
675 QT2_USB_TIMEOUT);
676 if (status < 0) {
677 dev_err(&serial->dev->dev,
678 "%s - failed to power on unit: %i\n", __func__, status);
679 return status;
680 }
681
682 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
683 if (!serial_priv)
684 return -ENOMEM;
685
686 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
687 if (!serial_priv->read_buffer) {
688 status = -ENOMEM;
689 goto err_buf;
690 }
691
692 usb_set_serial_data(serial, serial_priv);
693
694 status = qt2_setup_urbs(serial);
695 if (status != 0)
696 goto attach_failed;
697
698 return 0;
699
700attach_failed:
701 kfree(serial_priv->read_buffer);
702err_buf:
703 kfree(serial_priv);
704 return status;
705}
706
707static int qt2_port_probe(struct usb_serial_port *port)
708{
709 struct usb_serial *serial = port->serial;
710 struct qt2_port_private *port_priv;
711 u8 bEndpointAddress;
712
713 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
714 if (!port_priv)
715 return -ENOMEM;
716
717 spin_lock_init(&port_priv->lock);
718 spin_lock_init(&port_priv->urb_lock);
719 port_priv->port = port;
720
721 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
722 if (!port_priv->write_buffer)
723 goto err_buf;
724
725 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
726 if (!port_priv->write_urb)
727 goto err_urb;
728
729 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
730 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
731 usb_sndbulkpipe(serial->dev, bEndpointAddress),
732 port_priv->write_buffer,
733 QT2_WRITE_BUFFER_SIZE,
734 qt2_write_bulk_callback, port);
735
736 usb_set_serial_port_data(port, port_priv);
737
738 return 0;
739err_urb:
740 kfree(port_priv->write_buffer);
741err_buf:
742 kfree(port_priv);
743 return -ENOMEM;
744}
745
746static int qt2_port_remove(struct usb_serial_port *port)
747{
748 struct qt2_port_private *port_priv;
749
750 port_priv = usb_get_serial_port_data(port);
751 usb_free_urb(port_priv->write_urb);
752 kfree(port_priv->write_buffer);
753 kfree(port_priv);
754
755 return 0;
756}
757
758static int qt2_tiocmget(struct tty_struct *tty)
759{
760 struct usb_serial_port *port = tty->driver_data;
761 struct usb_device *dev = port->serial->dev;
762 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
763 u8 *d;
764 int r;
765
766 d = kzalloc(2, GFP_KERNEL);
767 if (!d)
768 return -ENOMEM;
769
770 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
771 if (r < 0)
772 goto mget_out;
773
774 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
775 if (r < 0)
776 goto mget_out;
777
778 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
779 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
780 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
781 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
782 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
783 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
784
785mget_out:
786 kfree(d);
787 return r;
788}
789
790static int qt2_tiocmset(struct tty_struct *tty,
791 unsigned int set, unsigned int clear)
792{
793 struct qt2_port_private *port_priv;
794
795 port_priv = usb_get_serial_port_data(tty->driver_data);
796 return update_mctrl(port_priv, set, clear);
797}
798
799static void qt2_break_ctl(struct tty_struct *tty, int break_state)
800{
801 struct usb_serial_port *port = tty->driver_data;
802 struct qt2_port_private *port_priv;
803 int status;
804 u16 val;
805
806 port_priv = usb_get_serial_port_data(port);
807
808 val = (break_state == -1) ? 1 : 0;
809
810 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
811 val, port_priv->device_port);
812 if (status < 0)
813 dev_warn(&port->dev,
814 "%s - failed to send control message: %i\n", __func__,
815 status);
816}
817
818
819
820static void qt2_dtr_rts(struct usb_serial_port *port, int on)
821{
822 struct usb_device *dev = port->serial->dev;
823 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
824
825 /* Disable flow control */
826 if (!on) {
827 if (qt2_setregister(dev, port_priv->device_port,
828 UART_MCR, 0) < 0)
829 dev_warn(&port->dev, "error from flowcontrol urb\n");
830 }
831 /* drop RTS and DTR */
832 if (on)
833 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
834 else
835 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
836}
837
838static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
839{
840 struct qt2_port_private *port_priv;
841 u8 newMSR = (u8) *ch;
842 unsigned long flags;
843
844 port_priv = usb_get_serial_port_data(port);
845
846 spin_lock_irqsave(&port_priv->lock, flags);
847 port_priv->shadowMSR = newMSR;
848 spin_unlock_irqrestore(&port_priv->lock, flags);
849
850 if (newMSR & UART_MSR_ANY_DELTA) {
851 /* update input line counters */
852 if (newMSR & UART_MSR_DCTS)
853 port->icount.cts++;
854 if (newMSR & UART_MSR_DDSR)
855 port->icount.dsr++;
856 if (newMSR & UART_MSR_DDCD)
857 port->icount.dcd++;
858 if (newMSR & UART_MSR_TERI)
859 port->icount.rng++;
860
861 wake_up_interruptible(&port->port.delta_msr_wait);
862 }
863}
864
865static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
866{
867 struct qt2_port_private *port_priv;
868 struct async_icount *icount;
869 unsigned long flags;
870 u8 newLSR = (u8) *ch;
871
872 port_priv = usb_get_serial_port_data(port);
873
874 if (newLSR & UART_LSR_BI)
875 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
876
877 spin_lock_irqsave(&port_priv->lock, flags);
878 port_priv->shadowLSR = newLSR;
879 spin_unlock_irqrestore(&port_priv->lock, flags);
880
881 icount = &port->icount;
882
883 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
884
885 if (newLSR & UART_LSR_BI)
886 icount->brk++;
887
888 if (newLSR & UART_LSR_OE)
889 icount->overrun++;
890
891 if (newLSR & UART_LSR_PE)
892 icount->parity++;
893
894 if (newLSR & UART_LSR_FE)
895 icount->frame++;
896 }
897
898}
899
900static int qt2_write_room(struct tty_struct *tty)
901{
902 struct usb_serial_port *port = tty->driver_data;
903 struct qt2_port_private *port_priv;
904 unsigned long flags = 0;
905 int r;
906
907 port_priv = usb_get_serial_port_data(port);
908
909 spin_lock_irqsave(&port_priv->urb_lock, flags);
910
911 if (port_priv->urb_in_use)
912 r = 0;
913 else
914 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
915
916 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
917
918 return r;
919}
920
921static int qt2_write(struct tty_struct *tty,
922 struct usb_serial_port *port,
923 const unsigned char *buf, int count)
924{
925 struct qt2_port_private *port_priv;
926 struct urb *write_urb;
927 unsigned char *data;
928 unsigned long flags;
929 int status;
930 int bytes_out = 0;
931
932 port_priv = usb_get_serial_port_data(port);
933
934 if (port_priv->write_urb == NULL) {
935 dev_err(&port->dev, "%s - no output urb\n", __func__);
936 return 0;
937 }
938 write_urb = port_priv->write_urb;
939
940 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
941
942 data = write_urb->transfer_buffer;
943 spin_lock_irqsave(&port_priv->urb_lock, flags);
944 if (port_priv->urb_in_use) {
945 dev_err(&port->dev, "qt2_write - urb is in use\n");
946 goto write_out;
947 }
948
949 *data++ = QT2_CONTROL_BYTE;
950 *data++ = QT2_CONTROL_BYTE;
951 *data++ = port_priv->device_port;
952 put_unaligned_le16(count, data);
953 data += 2;
954 memcpy(data, buf, count);
955
956 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
957
958 status = usb_submit_urb(write_urb, GFP_ATOMIC);
959 if (status == 0) {
960 port_priv->urb_in_use = true;
961 bytes_out += count;
962 }
963
964write_out:
965 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
966 return bytes_out;
967}
968
969
970static struct usb_serial_driver qt2_device = {
971 .driver = {
972 .owner = THIS_MODULE,
973 .name = "quatech-serial",
974 },
975 .description = DRIVER_DESC,
976 .id_table = id_table,
977 .open = qt2_open,
978 .close = qt2_close,
979 .write = qt2_write,
980 .write_room = qt2_write_room,
981 .calc_num_ports = qt2_calc_num_ports,
982 .attach = qt2_attach,
983 .release = qt2_release,
984 .disconnect = qt2_disconnect,
985 .port_probe = qt2_port_probe,
986 .port_remove = qt2_port_remove,
987 .dtr_rts = qt2_dtr_rts,
988 .break_ctl = qt2_break_ctl,
989 .tiocmget = qt2_tiocmget,
990 .tiocmset = qt2_tiocmset,
991 .tiocmiwait = usb_serial_generic_tiocmiwait,
992 .get_icount = usb_serial_generic_get_icount,
993 .get_serial = get_serial_info,
994 .set_termios = qt2_set_termios,
995};
996
997static struct usb_serial_driver *const serial_drivers[] = {
998 &qt2_device, NULL
999};
1000
1001module_usb_serial_driver(serial_drivers, id_table);
1002
1003MODULE_DESCRIPTION(DRIVER_DESC);
1004MODULE_LICENSE("GPL v2");