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1/*
2 * usb-serial driver for Quatech USB 2 devices
3 *
4 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
5 *
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.
9 *
10 *
11 * These devices all have only 1 bulk in and 1 bulk out that is shared
12 * for all serial ports.
13 *
14 */
15
16#include <asm/unaligned.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/tty.h>
20#include <linux/tty_driver.h>
21#include <linux/tty_flip.h>
22#include <linux/module.h>
23#include <linux/serial.h>
24#include <linux/usb.h>
25#include <linux/usb/serial.h>
26#include <linux/serial_reg.h>
27#include <linux/uaccess.h>
28
29/* default urb timeout for usb operations */
30#define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
31
32#define QT_OPEN_CLOSE_CHANNEL 0xca
33#define QT_SET_GET_DEVICE 0xc2
34#define QT_SET_GET_REGISTER 0xc0
35#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
36#define QT_SET_ATF 0xcd
37#define QT_TRANSFER_IN 0xc0
38#define QT_HW_FLOW_CONTROL_MASK 0xc5
39#define QT_SW_FLOW_CONTROL_MASK 0xc6
40#define QT2_BREAK_CONTROL 0xc8
41#define QT2_GET_SET_UART 0xc1
42#define QT2_FLUSH_DEVICE 0xc4
43#define QT2_GET_SET_QMCR 0xe1
44#define QT2_QMCR_RS232 0x40
45#define QT2_QMCR_RS422 0x10
46
47#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
48
49#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
50
51/* status bytes for the device */
52#define QT2_CONTROL_BYTE 0x1b
53#define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
54#define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
55#define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
56#define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
57#define QT2_REC_FLUSH 0x04 /* no following info */
58#define QT2_XMIT_FLUSH 0x05 /* no following info */
59#define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
60
61#define MAX_BAUD_RATE 921600
62#define DEFAULT_BAUD_RATE 9600
63
64#define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */
65#define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
66#define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
67
68#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
69
70#define USB_VENDOR_ID_QUATECH 0x061d
71#define QUATECH_SSU2_100 0xC120 /* RS232 single port */
72#define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
73#define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
74#define QUATECH_QSU2_100 0xC160 /* RS232 four port */
75#define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
76#define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
77#define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
78
79struct qt2_device_detail {
80 int product_id;
81 int num_ports;
82};
83
84#define QT_DETAILS(prod, ports) \
85 .product_id = (prod), \
86 .num_ports = (ports)
87
88static const struct qt2_device_detail qt2_device_details[] = {
89 {QT_DETAILS(QUATECH_SSU2_100, 1)},
90 {QT_DETAILS(QUATECH_DSU2_400, 2)},
91 {QT_DETAILS(QUATECH_DSU2_100, 2)},
92 {QT_DETAILS(QUATECH_QSU2_400, 4)},
93 {QT_DETAILS(QUATECH_QSU2_100, 4)},
94 {QT_DETAILS(QUATECH_ESU2_400, 8)},
95 {QT_DETAILS(QUATECH_ESU2_100, 8)},
96 {QT_DETAILS(0, 0)} /* Terminating entry */
97};
98
99static const struct usb_device_id id_table[] = {
100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
107 {} /* Terminating entry */
108};
109MODULE_DEVICE_TABLE(usb, id_table);
110
111struct qt2_serial_private {
112 unsigned char current_port; /* current port for incoming data */
113
114 struct urb *read_urb; /* shared among all ports */
115 char *read_buffer;
116};
117
118struct qt2_port_private {
119 u8 device_port;
120
121 spinlock_t urb_lock;
122 bool urb_in_use;
123 struct urb *write_urb;
124 char *write_buffer;
125
126 spinlock_t lock;
127 u8 shadowLSR;
128 u8 shadowMSR;
129
130 struct usb_serial_port *port;
131};
132
133static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
134static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
135static void qt2_write_bulk_callback(struct urb *urb);
136static void qt2_read_bulk_callback(struct urb *urb);
137
138static void qt2_release(struct usb_serial *serial)
139{
140 struct qt2_serial_private *serial_priv;
141
142 serial_priv = usb_get_serial_data(serial);
143
144 usb_free_urb(serial_priv->read_urb);
145 kfree(serial_priv->read_buffer);
146 kfree(serial_priv);
147}
148
149static inline int calc_baud_divisor(int baudrate)
150{
151 int divisor, rem;
152
153 divisor = MAX_BAUD_RATE / baudrate;
154 rem = MAX_BAUD_RATE % baudrate;
155 /* Round to nearest divisor */
156 if (((rem * 2) >= baudrate) && (baudrate != 110))
157 divisor++;
158
159 return divisor;
160}
161
162static inline int qt2_set_port_config(struct usb_device *dev,
163 unsigned char port_number,
164 u16 baudrate, u16 lcr)
165{
166 int divisor = calc_baud_divisor(baudrate);
167 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
168
169 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
170 QT2_GET_SET_UART, 0x40,
171 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
172}
173
174static inline int qt2_control_msg(struct usb_device *dev,
175 u8 request, u16 data, u16 index)
176{
177 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
178 request, 0x40, data, index,
179 NULL, 0, QT2_USB_TIMEOUT);
180}
181
182static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
183{
184 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
185
186 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
187}
188
189
190static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
191{
192 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
193 QT_SET_GET_DEVICE, 0xc0, 0, 0,
194 data, 3, QT2_USB_TIMEOUT);
195}
196
197static inline int qt2_getregister(struct usb_device *dev,
198 u8 uart,
199 u8 reg,
200 u8 *data)
201{
202 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
203 QT_SET_GET_REGISTER, 0xc0, reg,
204 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
205
206}
207
208static inline int qt2_setregister(struct usb_device *dev,
209 u8 uart, u8 reg, u16 data)
210{
211 u16 value = (data << 8) | reg;
212
213 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
214 QT_SET_GET_REGISTER, 0x40, value, uart,
215 NULL, 0, QT2_USB_TIMEOUT);
216}
217
218static inline int update_mctrl(struct qt2_port_private *port_priv,
219 unsigned int set, unsigned int clear)
220{
221 struct usb_serial_port *port = port_priv->port;
222 struct usb_device *dev = port->serial->dev;
223 unsigned urb_value;
224 int status;
225
226 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
227 dev_dbg(&port->dev,
228 "update_mctrl - DTR|RTS not being set|cleared\n");
229 return 0; /* no change */
230 }
231
232 clear &= ~set; /* 'set' takes precedence over 'clear' */
233 urb_value = 0;
234 if (set & TIOCM_DTR)
235 urb_value |= UART_MCR_DTR;
236 if (set & TIOCM_RTS)
237 urb_value |= UART_MCR_RTS;
238
239 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
240 urb_value);
241 if (status < 0)
242 dev_err(&port->dev,
243 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
244 status);
245 return status;
246}
247
248static int qt2_calc_num_ports(struct usb_serial *serial)
249{
250 struct qt2_device_detail d;
251 int i;
252
253 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
254 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
255 return d.num_ports;
256 }
257
258 /* we didn't recognize the device */
259 dev_err(&serial->dev->dev,
260 "don't know the number of ports, assuming 1\n");
261
262 return 1;
263}
264
265static void qt2_set_termios(struct tty_struct *tty,
266 struct usb_serial_port *port,
267 struct ktermios *old_termios)
268{
269 struct usb_device *dev = port->serial->dev;
270 struct qt2_port_private *port_priv;
271 struct ktermios *termios = &tty->termios;
272 u16 baud;
273 unsigned int cflag = termios->c_cflag;
274 u16 new_lcr = 0;
275 int status;
276
277 port_priv = usb_get_serial_port_data(port);
278
279 if (cflag & PARENB) {
280 if (cflag & PARODD)
281 new_lcr |= UART_LCR_PARITY;
282 else
283 new_lcr |= SERIAL_EVEN_PARITY;
284 }
285
286 switch (cflag & CSIZE) {
287 case CS5:
288 new_lcr |= UART_LCR_WLEN5;
289 break;
290 case CS6:
291 new_lcr |= UART_LCR_WLEN6;
292 break;
293 case CS7:
294 new_lcr |= UART_LCR_WLEN7;
295 break;
296 default:
297 case CS8:
298 new_lcr |= UART_LCR_WLEN8;
299 break;
300 }
301
302 baud = tty_get_baud_rate(tty);
303 if (!baud)
304 baud = 9600;
305
306 status = qt2_set_port_config(dev, port_priv->device_port, baud,
307 new_lcr);
308 if (status < 0)
309 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
310 __func__, status);
311
312 if (cflag & CRTSCTS)
313 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
314 SERIAL_CRTSCTS,
315 port_priv->device_port);
316 else
317 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
318 0, port_priv->device_port);
319 if (status < 0)
320 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
321 __func__, status);
322
323 if (I_IXOFF(tty) || I_IXON(tty)) {
324 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
325
326 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
327 x, port_priv->device_port);
328 } else
329 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
330 0, port_priv->device_port);
331
332 if (status < 0)
333 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
334 __func__, status);
335
336}
337
338static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
339{
340 struct usb_serial *serial;
341 struct qt2_port_private *port_priv;
342 u8 *data;
343 u16 device_port;
344 int status;
345 unsigned long flags;
346
347 device_port = port->port_number;
348
349 serial = port->serial;
350
351 port_priv = usb_get_serial_port_data(port);
352
353 /* set the port to RS232 mode */
354 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
355 QT2_QMCR_RS232, device_port);
356 if (status < 0) {
357 dev_err(&port->dev,
358 "%s failed to set RS232 mode for port %i error %i\n",
359 __func__, device_port, status);
360 return status;
361 }
362
363 data = kzalloc(2, GFP_KERNEL);
364 if (!data)
365 return -ENOMEM;
366
367 /* open the port */
368 status = usb_control_msg(serial->dev,
369 usb_rcvctrlpipe(serial->dev, 0),
370 QT_OPEN_CLOSE_CHANNEL,
371 0xc0, 0,
372 device_port, data, 2, QT2_USB_TIMEOUT);
373
374 if (status < 0) {
375 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
376 status);
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 unsigned long flags;
411 int i;
412
413 serial = port->serial;
414 port_priv = usb_get_serial_port_data(port);
415
416 spin_lock_irqsave(&port_priv->urb_lock, flags);
417 usb_kill_urb(port_priv->write_urb);
418 port_priv->urb_in_use = false;
419 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
420
421 /* flush the port transmit buffer */
422 i = usb_control_msg(serial->dev,
423 usb_rcvctrlpipe(serial->dev, 0),
424 QT2_FLUSH_DEVICE, 0x40, 1,
425 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
426
427 if (i < 0)
428 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
429 __func__, i);
430
431 /* flush the port receive buffer */
432 i = usb_control_msg(serial->dev,
433 usb_rcvctrlpipe(serial->dev, 0),
434 QT2_FLUSH_DEVICE, 0x40, 0,
435 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
436
437 if (i < 0)
438 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
439 __func__, i);
440
441 /* close the port */
442 i = usb_control_msg(serial->dev,
443 usb_sndctrlpipe(serial->dev, 0),
444 QT_OPEN_CLOSE_CHANNEL,
445 0x40, 0,
446 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
447
448 if (i < 0)
449 dev_err(&port->dev, "%s - close port failed %i\n",
450 __func__, i);
451}
452
453static void qt2_disconnect(struct usb_serial *serial)
454{
455 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
456
457 usb_kill_urb(serial_priv->read_urb);
458}
459
460static int get_serial_info(struct usb_serial_port *port,
461 struct serial_struct __user *retinfo)
462{
463 struct serial_struct tmp;
464
465 if (!retinfo)
466 return -EFAULT;
467
468 memset(&tmp, 0, sizeof(tmp));
469 tmp.line = port->minor;
470 tmp.port = 0;
471 tmp.irq = 0;
472 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
473 tmp.xmit_fifo_size = port->bulk_out_size;
474 tmp.baud_base = 9600;
475 tmp.close_delay = 5*HZ;
476 tmp.closing_wait = 30*HZ;
477
478 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
479 return -EFAULT;
480 return 0;
481}
482
483static int qt2_ioctl(struct tty_struct *tty,
484 unsigned int cmd, unsigned long arg)
485{
486 struct usb_serial_port *port = tty->driver_data;
487
488 switch (cmd) {
489 case TIOCGSERIAL:
490 return get_serial_info(port,
491 (struct serial_struct __user *)arg);
492 default:
493 break;
494 }
495
496 return -ENOIOCTLCMD;
497}
498
499static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
500{
501 switch (*ch) {
502 case QT2_LINE_STATUS:
503 qt2_update_lsr(port, ch + 1);
504 break;
505 case QT2_MODEM_STATUS:
506 qt2_update_msr(port, ch + 1);
507 break;
508 }
509}
510
511/* not needed, kept to document functionality */
512static void qt2_process_xmit_empty(struct usb_serial_port *port,
513 unsigned char *ch)
514{
515 int bytes_written;
516
517 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
518}
519
520/* not needed, kept to document functionality */
521static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
522{
523 return;
524}
525
526static void qt2_process_read_urb(struct urb *urb)
527{
528 struct usb_serial *serial;
529 struct qt2_serial_private *serial_priv;
530 struct usb_serial_port *port;
531 struct qt2_port_private *port_priv;
532 bool escapeflag;
533 unsigned char *ch;
534 int i;
535 unsigned char newport;
536 int len = urb->actual_length;
537
538 if (!len)
539 return;
540
541 ch = urb->transfer_buffer;
542 serial = urb->context;
543 serial_priv = usb_get_serial_data(serial);
544 port = serial->port[serial_priv->current_port];
545 port_priv = usb_get_serial_port_data(port);
546
547 for (i = 0; i < urb->actual_length; i++) {
548 ch = (unsigned char *)urb->transfer_buffer + i;
549 if ((i <= (len - 3)) &&
550 (*ch == QT2_CONTROL_BYTE) &&
551 (*(ch + 1) == QT2_CONTROL_BYTE)) {
552 escapeflag = false;
553 switch (*(ch + 2)) {
554 case QT2_LINE_STATUS:
555 case QT2_MODEM_STATUS:
556 if (i > (len - 4)) {
557 dev_warn(&port->dev,
558 "%s - status message too short\n",
559 __func__);
560 break;
561 }
562 qt2_process_status(port, ch + 2);
563 i += 3;
564 escapeflag = true;
565 break;
566 case QT2_XMIT_HOLD:
567 if (i > (len - 5)) {
568 dev_warn(&port->dev,
569 "%s - xmit_empty message too short\n",
570 __func__);
571 break;
572 }
573 qt2_process_xmit_empty(port, ch + 3);
574 i += 4;
575 escapeflag = true;
576 break;
577 case QT2_CHANGE_PORT:
578 if (i > (len - 4)) {
579 dev_warn(&port->dev,
580 "%s - change_port message too short\n",
581 __func__);
582 break;
583 }
584 tty_flip_buffer_push(&port->port);
585
586 newport = *(ch + 3);
587
588 if (newport > serial->num_ports) {
589 dev_err(&port->dev,
590 "%s - port change to invalid port: %i\n",
591 __func__, newport);
592 break;
593 }
594
595 serial_priv->current_port = newport;
596 port = serial->port[serial_priv->current_port];
597 port_priv = usb_get_serial_port_data(port);
598 i += 3;
599 escapeflag = true;
600 break;
601 case QT2_REC_FLUSH:
602 case QT2_XMIT_FLUSH:
603 qt2_process_flush(port, ch + 2);
604 i += 2;
605 escapeflag = true;
606 break;
607 case QT2_CONTROL_ESCAPE:
608 tty_buffer_request_room(&port->port, 2);
609 tty_insert_flip_string(&port->port, ch, 2);
610 i += 2;
611 escapeflag = true;
612 break;
613 default:
614 dev_warn(&port->dev,
615 "%s - unsupported command %i\n",
616 __func__, *(ch + 2));
617 break;
618 }
619 if (escapeflag)
620 continue;
621 }
622
623 tty_buffer_request_room(&port->port, 1);
624 tty_insert_flip_string(&port->port, ch, 1);
625 }
626
627 tty_flip_buffer_push(&port->port);
628}
629
630static void qt2_write_bulk_callback(struct urb *urb)
631{
632 struct usb_serial_port *port;
633 struct qt2_port_private *port_priv;
634
635 port = urb->context;
636 port_priv = usb_get_serial_port_data(port);
637
638 spin_lock(&port_priv->urb_lock);
639
640 port_priv->urb_in_use = false;
641 usb_serial_port_softint(port);
642
643 spin_unlock(&port_priv->urb_lock);
644
645}
646
647static void qt2_read_bulk_callback(struct urb *urb)
648{
649 struct usb_serial *serial = urb->context;
650 int status;
651
652 if (urb->status) {
653 dev_warn(&serial->dev->dev,
654 "%s - non-zero urb status: %i\n", __func__,
655 urb->status);
656 return;
657 }
658
659 qt2_process_read_urb(urb);
660
661 status = usb_submit_urb(urb, GFP_ATOMIC);
662 if (status != 0)
663 dev_err(&serial->dev->dev,
664 "%s - resubmit read urb failed: %i\n",
665 __func__, status);
666}
667
668static int qt2_setup_urbs(struct usb_serial *serial)
669{
670 struct usb_serial_port *port0;
671 struct qt2_serial_private *serial_priv;
672 int status;
673
674 port0 = serial->port[0];
675
676 serial_priv = usb_get_serial_data(serial);
677 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
678 if (!serial_priv->read_urb)
679 return -ENOMEM;
680
681 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
682 usb_rcvbulkpipe(serial->dev,
683 port0->bulk_in_endpointAddress),
684 serial_priv->read_buffer,
685 QT2_READ_BUFFER_SIZE,
686 qt2_read_bulk_callback, serial);
687
688 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
689 if (status != 0) {
690 dev_err(&serial->dev->dev,
691 "%s - submit read urb failed %i\n", __func__, status);
692 usb_free_urb(serial_priv->read_urb);
693 return status;
694 }
695
696 return 0;
697}
698
699static int qt2_attach(struct usb_serial *serial)
700{
701 struct qt2_serial_private *serial_priv;
702 int status;
703
704 /* power on unit */
705 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
706 0xc2, 0x40, 0x8000, 0, NULL, 0,
707 QT2_USB_TIMEOUT);
708 if (status < 0) {
709 dev_err(&serial->dev->dev,
710 "%s - failed to power on unit: %i\n", __func__, status);
711 return status;
712 }
713
714 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
715 if (!serial_priv)
716 return -ENOMEM;
717
718 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
719 if (!serial_priv->read_buffer) {
720 status = -ENOMEM;
721 goto err_buf;
722 }
723
724 usb_set_serial_data(serial, serial_priv);
725
726 status = qt2_setup_urbs(serial);
727 if (status != 0)
728 goto attach_failed;
729
730 return 0;
731
732attach_failed:
733 kfree(serial_priv->read_buffer);
734err_buf:
735 kfree(serial_priv);
736 return status;
737}
738
739static int qt2_port_probe(struct usb_serial_port *port)
740{
741 struct usb_serial *serial = port->serial;
742 struct qt2_port_private *port_priv;
743 u8 bEndpointAddress;
744
745 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
746 if (!port_priv)
747 return -ENOMEM;
748
749 spin_lock_init(&port_priv->lock);
750 spin_lock_init(&port_priv->urb_lock);
751 port_priv->port = port;
752
753 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
754 if (!port_priv->write_buffer)
755 goto err_buf;
756
757 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
758 if (!port_priv->write_urb)
759 goto err_urb;
760
761 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
762 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
763 usb_sndbulkpipe(serial->dev, bEndpointAddress),
764 port_priv->write_buffer,
765 QT2_WRITE_BUFFER_SIZE,
766 qt2_write_bulk_callback, port);
767
768 usb_set_serial_port_data(port, port_priv);
769
770 return 0;
771err_urb:
772 kfree(port_priv->write_buffer);
773err_buf:
774 kfree(port_priv);
775 return -ENOMEM;
776}
777
778static int qt2_port_remove(struct usb_serial_port *port)
779{
780 struct qt2_port_private *port_priv;
781
782 port_priv = usb_get_serial_port_data(port);
783 usb_free_urb(port_priv->write_urb);
784 kfree(port_priv->write_buffer);
785 kfree(port_priv);
786
787 return 0;
788}
789
790static int qt2_tiocmget(struct tty_struct *tty)
791{
792 struct usb_serial_port *port = tty->driver_data;
793 struct usb_device *dev = port->serial->dev;
794 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
795 u8 *d;
796 int r;
797
798 d = kzalloc(2, GFP_KERNEL);
799 if (!d)
800 return -ENOMEM;
801
802 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
803 if (r < 0)
804 goto mget_out;
805
806 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
807 if (r < 0)
808 goto mget_out;
809
810 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
811 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
812 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
813 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
814 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
815 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
816
817mget_out:
818 kfree(d);
819 return r;
820}
821
822static int qt2_tiocmset(struct tty_struct *tty,
823 unsigned int set, unsigned int clear)
824{
825 struct qt2_port_private *port_priv;
826
827 port_priv = usb_get_serial_port_data(tty->driver_data);
828 return update_mctrl(port_priv, set, clear);
829}
830
831static void qt2_break_ctl(struct tty_struct *tty, int break_state)
832{
833 struct usb_serial_port *port = tty->driver_data;
834 struct qt2_port_private *port_priv;
835 int status;
836 u16 val;
837
838 port_priv = usb_get_serial_port_data(port);
839
840 val = (break_state == -1) ? 1 : 0;
841
842 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
843 val, port_priv->device_port);
844 if (status < 0)
845 dev_warn(&port->dev,
846 "%s - failed to send control message: %i\n", __func__,
847 status);
848}
849
850
851
852static void qt2_dtr_rts(struct usb_serial_port *port, int on)
853{
854 struct usb_device *dev = port->serial->dev;
855 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
856
857 /* Disable flow control */
858 if (!on) {
859 if (qt2_setregister(dev, port_priv->device_port,
860 UART_MCR, 0) < 0)
861 dev_warn(&port->dev, "error from flowcontrol urb\n");
862 }
863 /* drop RTS and DTR */
864 if (on)
865 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
866 else
867 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
868}
869
870static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
871{
872 struct qt2_port_private *port_priv;
873 u8 newMSR = (u8) *ch;
874 unsigned long flags;
875
876 port_priv = usb_get_serial_port_data(port);
877
878 spin_lock_irqsave(&port_priv->lock, flags);
879 port_priv->shadowMSR = newMSR;
880 spin_unlock_irqrestore(&port_priv->lock, flags);
881
882 if (newMSR & UART_MSR_ANY_DELTA) {
883 /* update input line counters */
884 if (newMSR & UART_MSR_DCTS)
885 port->icount.cts++;
886 if (newMSR & UART_MSR_DDSR)
887 port->icount.dsr++;
888 if (newMSR & UART_MSR_DDCD)
889 port->icount.dcd++;
890 if (newMSR & UART_MSR_TERI)
891 port->icount.rng++;
892
893 wake_up_interruptible(&port->port.delta_msr_wait);
894 }
895}
896
897static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
898{
899 struct qt2_port_private *port_priv;
900 struct async_icount *icount;
901 unsigned long flags;
902 u8 newLSR = (u8) *ch;
903
904 port_priv = usb_get_serial_port_data(port);
905
906 if (newLSR & UART_LSR_BI)
907 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
908
909 spin_lock_irqsave(&port_priv->lock, flags);
910 port_priv->shadowLSR = newLSR;
911 spin_unlock_irqrestore(&port_priv->lock, flags);
912
913 icount = &port->icount;
914
915 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
916
917 if (newLSR & UART_LSR_BI)
918 icount->brk++;
919
920 if (newLSR & UART_LSR_OE)
921 icount->overrun++;
922
923 if (newLSR & UART_LSR_PE)
924 icount->parity++;
925
926 if (newLSR & UART_LSR_FE)
927 icount->frame++;
928 }
929
930}
931
932static int qt2_write_room(struct tty_struct *tty)
933{
934 struct usb_serial_port *port = tty->driver_data;
935 struct qt2_port_private *port_priv;
936 unsigned long flags = 0;
937 int r;
938
939 port_priv = usb_get_serial_port_data(port);
940
941 spin_lock_irqsave(&port_priv->urb_lock, flags);
942
943 if (port_priv->urb_in_use)
944 r = 0;
945 else
946 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
947
948 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
949
950 return r;
951}
952
953static int qt2_write(struct tty_struct *tty,
954 struct usb_serial_port *port,
955 const unsigned char *buf, int count)
956{
957 struct qt2_port_private *port_priv;
958 struct urb *write_urb;
959 unsigned char *data;
960 unsigned long flags;
961 int status;
962 int bytes_out = 0;
963
964 port_priv = usb_get_serial_port_data(port);
965
966 if (port_priv->write_urb == NULL) {
967 dev_err(&port->dev, "%s - no output urb\n", __func__);
968 return 0;
969 }
970 write_urb = port_priv->write_urb;
971
972 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
973
974 data = write_urb->transfer_buffer;
975 spin_lock_irqsave(&port_priv->urb_lock, flags);
976 if (port_priv->urb_in_use) {
977 dev_err(&port->dev, "qt2_write - urb is in use\n");
978 goto write_out;
979 }
980
981 *data++ = QT2_CONTROL_BYTE;
982 *data++ = QT2_CONTROL_BYTE;
983 *data++ = port_priv->device_port;
984 put_unaligned_le16(count, data);
985 data += 2;
986 memcpy(data, buf, count);
987
988 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
989
990 status = usb_submit_urb(write_urb, GFP_ATOMIC);
991 if (status == 0) {
992 port_priv->urb_in_use = true;
993 bytes_out += count;
994 }
995
996write_out:
997 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
998 return bytes_out;
999}
1000
1001
1002static struct usb_serial_driver qt2_device = {
1003 .driver = {
1004 .owner = THIS_MODULE,
1005 .name = "quatech-serial",
1006 },
1007 .description = DRIVER_DESC,
1008 .id_table = id_table,
1009 .open = qt2_open,
1010 .close = qt2_close,
1011 .write = qt2_write,
1012 .write_room = qt2_write_room,
1013 .calc_num_ports = qt2_calc_num_ports,
1014 .attach = qt2_attach,
1015 .release = qt2_release,
1016 .disconnect = qt2_disconnect,
1017 .port_probe = qt2_port_probe,
1018 .port_remove = qt2_port_remove,
1019 .dtr_rts = qt2_dtr_rts,
1020 .break_ctl = qt2_break_ctl,
1021 .tiocmget = qt2_tiocmget,
1022 .tiocmset = qt2_tiocmset,
1023 .tiocmiwait = usb_serial_generic_tiocmiwait,
1024 .get_icount = usb_serial_generic_get_icount,
1025 .ioctl = qt2_ioctl,
1026 .set_termios = qt2_set_termios,
1027};
1028
1029static struct usb_serial_driver *const serial_drivers[] = {
1030 &qt2_device, NULL
1031};
1032
1033module_usb_serial_driver(serial_drivers, id_table);
1034
1035MODULE_DESCRIPTION(DRIVER_DESC);
1036MODULE_LICENSE("GPL");