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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 < 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 usb_serial_port *port,
457 struct serial_struct __user *retinfo)
458{
459 struct serial_struct tmp;
460
461 memset(&tmp, 0, sizeof(tmp));
462 tmp.line = port->minor;
463 tmp.port = 0;
464 tmp.irq = 0;
465 tmp.xmit_fifo_size = port->bulk_out_size;
466 tmp.baud_base = 9600;
467 tmp.close_delay = 5*HZ;
468 tmp.closing_wait = 30*HZ;
469
470 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
471 return -EFAULT;
472 return 0;
473}
474
475static int qt2_ioctl(struct tty_struct *tty,
476 unsigned int cmd, unsigned long arg)
477{
478 struct usb_serial_port *port = tty->driver_data;
479
480 switch (cmd) {
481 case TIOCGSERIAL:
482 return get_serial_info(port,
483 (struct serial_struct __user *)arg);
484 default:
485 break;
486 }
487
488 return -ENOIOCTLCMD;
489}
490
491static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
492{
493 switch (*ch) {
494 case QT2_LINE_STATUS:
495 qt2_update_lsr(port, ch + 1);
496 break;
497 case QT2_MODEM_STATUS:
498 qt2_update_msr(port, ch + 1);
499 break;
500 }
501}
502
503/* not needed, kept to document functionality */
504static void qt2_process_xmit_empty(struct usb_serial_port *port,
505 unsigned char *ch)
506{
507 int bytes_written;
508
509 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
510}
511
512/* not needed, kept to document functionality */
513static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
514{
515 return;
516}
517
518static void qt2_process_read_urb(struct urb *urb)
519{
520 struct usb_serial *serial;
521 struct qt2_serial_private *serial_priv;
522 struct usb_serial_port *port;
523 struct qt2_port_private *port_priv;
524 bool escapeflag;
525 unsigned char *ch;
526 int i;
527 unsigned char newport;
528 int len = urb->actual_length;
529
530 if (!len)
531 return;
532
533 ch = urb->transfer_buffer;
534 serial = urb->context;
535 serial_priv = usb_get_serial_data(serial);
536 port = serial->port[serial_priv->current_port];
537 port_priv = usb_get_serial_port_data(port);
538
539 for (i = 0; i < urb->actual_length; i++) {
540 ch = (unsigned char *)urb->transfer_buffer + i;
541 if ((i <= (len - 3)) &&
542 (*ch == QT2_CONTROL_BYTE) &&
543 (*(ch + 1) == QT2_CONTROL_BYTE)) {
544 escapeflag = false;
545 switch (*(ch + 2)) {
546 case QT2_LINE_STATUS:
547 case QT2_MODEM_STATUS:
548 if (i > (len - 4)) {
549 dev_warn(&port->dev,
550 "%s - status message too short\n",
551 __func__);
552 break;
553 }
554 qt2_process_status(port, ch + 2);
555 i += 3;
556 escapeflag = true;
557 break;
558 case QT2_XMIT_HOLD:
559 if (i > (len - 5)) {
560 dev_warn(&port->dev,
561 "%s - xmit_empty message too short\n",
562 __func__);
563 break;
564 }
565 qt2_process_xmit_empty(port, ch + 3);
566 i += 4;
567 escapeflag = true;
568 break;
569 case QT2_CHANGE_PORT:
570 if (i > (len - 4)) {
571 dev_warn(&port->dev,
572 "%s - change_port message too short\n",
573 __func__);
574 break;
575 }
576 tty_flip_buffer_push(&port->port);
577
578 newport = *(ch + 3);
579
580 if (newport > serial->num_ports) {
581 dev_err(&port->dev,
582 "%s - port change to invalid port: %i\n",
583 __func__, newport);
584 break;
585 }
586
587 serial_priv->current_port = newport;
588 port = serial->port[serial_priv->current_port];
589 port_priv = usb_get_serial_port_data(port);
590 i += 3;
591 escapeflag = true;
592 break;
593 case QT2_REC_FLUSH:
594 case QT2_XMIT_FLUSH:
595 qt2_process_flush(port, ch + 2);
596 i += 2;
597 escapeflag = true;
598 break;
599 case QT2_CONTROL_ESCAPE:
600 tty_insert_flip_string(&port->port, ch, 2);
601 i += 2;
602 escapeflag = true;
603 break;
604 default:
605 dev_warn(&port->dev,
606 "%s - unsupported command %i\n",
607 __func__, *(ch + 2));
608 break;
609 }
610 if (escapeflag)
611 continue;
612 }
613
614 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
615 }
616
617 tty_flip_buffer_push(&port->port);
618}
619
620static void qt2_write_bulk_callback(struct urb *urb)
621{
622 struct usb_serial_port *port;
623 struct qt2_port_private *port_priv;
624
625 port = urb->context;
626 port_priv = usb_get_serial_port_data(port);
627
628 spin_lock(&port_priv->urb_lock);
629
630 port_priv->urb_in_use = false;
631 usb_serial_port_softint(port);
632
633 spin_unlock(&port_priv->urb_lock);
634
635}
636
637static void qt2_read_bulk_callback(struct urb *urb)
638{
639 struct usb_serial *serial = urb->context;
640 int status;
641
642 if (urb->status) {
643 dev_warn(&serial->dev->dev,
644 "%s - non-zero urb status: %i\n", __func__,
645 urb->status);
646 return;
647 }
648
649 qt2_process_read_urb(urb);
650
651 status = usb_submit_urb(urb, GFP_ATOMIC);
652 if (status != 0)
653 dev_err(&serial->dev->dev,
654 "%s - resubmit read urb failed: %i\n",
655 __func__, status);
656}
657
658static int qt2_setup_urbs(struct usb_serial *serial)
659{
660 struct usb_serial_port *port0;
661 struct qt2_serial_private *serial_priv;
662 int status;
663
664 port0 = serial->port[0];
665
666 serial_priv = usb_get_serial_data(serial);
667 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
668 if (!serial_priv->read_urb)
669 return -ENOMEM;
670
671 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
672 usb_rcvbulkpipe(serial->dev,
673 port0->bulk_in_endpointAddress),
674 serial_priv->read_buffer,
675 QT2_READ_BUFFER_SIZE,
676 qt2_read_bulk_callback, serial);
677
678 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
679 if (status != 0) {
680 dev_err(&serial->dev->dev,
681 "%s - submit read urb failed %i\n", __func__, status);
682 usb_free_urb(serial_priv->read_urb);
683 return status;
684 }
685
686 return 0;
687}
688
689static int qt2_attach(struct usb_serial *serial)
690{
691 struct qt2_serial_private *serial_priv;
692 int status;
693
694 /* power on unit */
695 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
696 0xc2, 0x40, 0x8000, 0, NULL, 0,
697 QT2_USB_TIMEOUT);
698 if (status < 0) {
699 dev_err(&serial->dev->dev,
700 "%s - failed to power on unit: %i\n", __func__, status);
701 return status;
702 }
703
704 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
705 if (!serial_priv)
706 return -ENOMEM;
707
708 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
709 if (!serial_priv->read_buffer) {
710 status = -ENOMEM;
711 goto err_buf;
712 }
713
714 usb_set_serial_data(serial, serial_priv);
715
716 status = qt2_setup_urbs(serial);
717 if (status != 0)
718 goto attach_failed;
719
720 return 0;
721
722attach_failed:
723 kfree(serial_priv->read_buffer);
724err_buf:
725 kfree(serial_priv);
726 return status;
727}
728
729static int qt2_port_probe(struct usb_serial_port *port)
730{
731 struct usb_serial *serial = port->serial;
732 struct qt2_port_private *port_priv;
733 u8 bEndpointAddress;
734
735 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
736 if (!port_priv)
737 return -ENOMEM;
738
739 spin_lock_init(&port_priv->lock);
740 spin_lock_init(&port_priv->urb_lock);
741 port_priv->port = port;
742
743 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
744 if (!port_priv->write_buffer)
745 goto err_buf;
746
747 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
748 if (!port_priv->write_urb)
749 goto err_urb;
750
751 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
752 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
753 usb_sndbulkpipe(serial->dev, bEndpointAddress),
754 port_priv->write_buffer,
755 QT2_WRITE_BUFFER_SIZE,
756 qt2_write_bulk_callback, port);
757
758 usb_set_serial_port_data(port, port_priv);
759
760 return 0;
761err_urb:
762 kfree(port_priv->write_buffer);
763err_buf:
764 kfree(port_priv);
765 return -ENOMEM;
766}
767
768static int qt2_port_remove(struct usb_serial_port *port)
769{
770 struct qt2_port_private *port_priv;
771
772 port_priv = usb_get_serial_port_data(port);
773 usb_free_urb(port_priv->write_urb);
774 kfree(port_priv->write_buffer);
775 kfree(port_priv);
776
777 return 0;
778}
779
780static int qt2_tiocmget(struct tty_struct *tty)
781{
782 struct usb_serial_port *port = tty->driver_data;
783 struct usb_device *dev = port->serial->dev;
784 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
785 u8 *d;
786 int r;
787
788 d = kzalloc(2, GFP_KERNEL);
789 if (!d)
790 return -ENOMEM;
791
792 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
793 if (r < 0)
794 goto mget_out;
795
796 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
797 if (r < 0)
798 goto mget_out;
799
800 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
801 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
802 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
803 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
804 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
805 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
806
807mget_out:
808 kfree(d);
809 return r;
810}
811
812static int qt2_tiocmset(struct tty_struct *tty,
813 unsigned int set, unsigned int clear)
814{
815 struct qt2_port_private *port_priv;
816
817 port_priv = usb_get_serial_port_data(tty->driver_data);
818 return update_mctrl(port_priv, set, clear);
819}
820
821static void qt2_break_ctl(struct tty_struct *tty, int break_state)
822{
823 struct usb_serial_port *port = tty->driver_data;
824 struct qt2_port_private *port_priv;
825 int status;
826 u16 val;
827
828 port_priv = usb_get_serial_port_data(port);
829
830 val = (break_state == -1) ? 1 : 0;
831
832 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
833 val, port_priv->device_port);
834 if (status < 0)
835 dev_warn(&port->dev,
836 "%s - failed to send control message: %i\n", __func__,
837 status);
838}
839
840
841
842static void qt2_dtr_rts(struct usb_serial_port *port, int on)
843{
844 struct usb_device *dev = port->serial->dev;
845 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
846
847 /* Disable flow control */
848 if (!on) {
849 if (qt2_setregister(dev, port_priv->device_port,
850 UART_MCR, 0) < 0)
851 dev_warn(&port->dev, "error from flowcontrol urb\n");
852 }
853 /* drop RTS and DTR */
854 if (on)
855 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
856 else
857 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
858}
859
860static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
861{
862 struct qt2_port_private *port_priv;
863 u8 newMSR = (u8) *ch;
864 unsigned long flags;
865
866 port_priv = usb_get_serial_port_data(port);
867
868 spin_lock_irqsave(&port_priv->lock, flags);
869 port_priv->shadowMSR = newMSR;
870 spin_unlock_irqrestore(&port_priv->lock, flags);
871
872 if (newMSR & UART_MSR_ANY_DELTA) {
873 /* update input line counters */
874 if (newMSR & UART_MSR_DCTS)
875 port->icount.cts++;
876 if (newMSR & UART_MSR_DDSR)
877 port->icount.dsr++;
878 if (newMSR & UART_MSR_DDCD)
879 port->icount.dcd++;
880 if (newMSR & UART_MSR_TERI)
881 port->icount.rng++;
882
883 wake_up_interruptible(&port->port.delta_msr_wait);
884 }
885}
886
887static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
888{
889 struct qt2_port_private *port_priv;
890 struct async_icount *icount;
891 unsigned long flags;
892 u8 newLSR = (u8) *ch;
893
894 port_priv = usb_get_serial_port_data(port);
895
896 if (newLSR & UART_LSR_BI)
897 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
898
899 spin_lock_irqsave(&port_priv->lock, flags);
900 port_priv->shadowLSR = newLSR;
901 spin_unlock_irqrestore(&port_priv->lock, flags);
902
903 icount = &port->icount;
904
905 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
906
907 if (newLSR & UART_LSR_BI)
908 icount->brk++;
909
910 if (newLSR & UART_LSR_OE)
911 icount->overrun++;
912
913 if (newLSR & UART_LSR_PE)
914 icount->parity++;
915
916 if (newLSR & UART_LSR_FE)
917 icount->frame++;
918 }
919
920}
921
922static int qt2_write_room(struct tty_struct *tty)
923{
924 struct usb_serial_port *port = tty->driver_data;
925 struct qt2_port_private *port_priv;
926 unsigned long flags = 0;
927 int r;
928
929 port_priv = usb_get_serial_port_data(port);
930
931 spin_lock_irqsave(&port_priv->urb_lock, flags);
932
933 if (port_priv->urb_in_use)
934 r = 0;
935 else
936 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
937
938 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
939
940 return r;
941}
942
943static int qt2_write(struct tty_struct *tty,
944 struct usb_serial_port *port,
945 const unsigned char *buf, int count)
946{
947 struct qt2_port_private *port_priv;
948 struct urb *write_urb;
949 unsigned char *data;
950 unsigned long flags;
951 int status;
952 int bytes_out = 0;
953
954 port_priv = usb_get_serial_port_data(port);
955
956 if (port_priv->write_urb == NULL) {
957 dev_err(&port->dev, "%s - no output urb\n", __func__);
958 return 0;
959 }
960 write_urb = port_priv->write_urb;
961
962 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
963
964 data = write_urb->transfer_buffer;
965 spin_lock_irqsave(&port_priv->urb_lock, flags);
966 if (port_priv->urb_in_use) {
967 dev_err(&port->dev, "qt2_write - urb is in use\n");
968 goto write_out;
969 }
970
971 *data++ = QT2_CONTROL_BYTE;
972 *data++ = QT2_CONTROL_BYTE;
973 *data++ = port_priv->device_port;
974 put_unaligned_le16(count, data);
975 data += 2;
976 memcpy(data, buf, count);
977
978 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
979
980 status = usb_submit_urb(write_urb, GFP_ATOMIC);
981 if (status == 0) {
982 port_priv->urb_in_use = true;
983 bytes_out += count;
984 }
985
986write_out:
987 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
988 return bytes_out;
989}
990
991
992static struct usb_serial_driver qt2_device = {
993 .driver = {
994 .owner = THIS_MODULE,
995 .name = "quatech-serial",
996 },
997 .description = DRIVER_DESC,
998 .id_table = id_table,
999 .open = qt2_open,
1000 .close = qt2_close,
1001 .write = qt2_write,
1002 .write_room = qt2_write_room,
1003 .calc_num_ports = qt2_calc_num_ports,
1004 .attach = qt2_attach,
1005 .release = qt2_release,
1006 .disconnect = qt2_disconnect,
1007 .port_probe = qt2_port_probe,
1008 .port_remove = qt2_port_remove,
1009 .dtr_rts = qt2_dtr_rts,
1010 .break_ctl = qt2_break_ctl,
1011 .tiocmget = qt2_tiocmget,
1012 .tiocmset = qt2_tiocmset,
1013 .tiocmiwait = usb_serial_generic_tiocmiwait,
1014 .get_icount = usb_serial_generic_get_icount,
1015 .ioctl = qt2_ioctl,
1016 .set_termios = qt2_set_termios,
1017};
1018
1019static struct usb_serial_driver *const serial_drivers[] = {
1020 &qt2_device, NULL
1021};
1022
1023module_usb_serial_driver(serial_drivers, id_table);
1024
1025MODULE_DESCRIPTION(DRIVER_DESC);
1026MODULE_LICENSE("GPL v2");