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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
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
48#define QT2_CONTROL_BYTE 0x1b
49#define QT2_LINE_STATUS 0x00
50#define QT2_MODEM_STATUS 0x01
51#define QT2_XMIT_HOLD 0x02
52#define QT2_CHANGE_PORT 0x03
53#define QT2_REC_FLUSH 0x04
54#define QT2_XMIT_FLUSH 0x05
55#define QT2_CONTROL_ESCAPE 0xff
56
57#define MAX_BAUD_RATE 921600
58#define DEFAULT_BAUD_RATE 9600
59
60#define QT2_READ_BUFFER_SIZE 512
61#define QT2_WRITE_BUFFER_SIZE 512
62#define QT2_WRITE_CONTROL_SIZE 5
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
68#define QUATECH_DSU2_100 0xC140
69#define QUATECH_DSU2_400 0xC150
70#define QUATECH_QSU2_100 0xC160
71#define QUATECH_QSU2_400 0xC170
72#define QUATECH_ESU2_100 0xC1A0
73#define QUATECH_ESU2_400 0xC180
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)}
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 {}
104};
105MODULE_DEVICE_TABLE(usb, id_table);
106
107struct qt2_serial_private {
108 unsigned char current_port;
109
110 struct urb *read_urb;
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
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;
227 }
228
229 clear &= ~set;
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
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
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
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
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
418 i = usb_control_msg(serial->dev,
419 usb_sndctrlpipe(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
428 i = usb_control_msg(serial->dev,
429 usb_sndctrlpipe(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
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 void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
457{
458 switch (*ch) {
459 case QT2_LINE_STATUS:
460 qt2_update_lsr(port, ch + 1);
461 break;
462 case QT2_MODEM_STATUS:
463 qt2_update_msr(port, ch + 1);
464 break;
465 }
466}
467
468static void qt2_process_read_urb(struct urb *urb)
469{
470 struct usb_serial *serial;
471 struct qt2_serial_private *serial_priv;
472 struct usb_serial_port *port;
473 bool escapeflag;
474 unsigned char *ch;
475 int i;
476 unsigned char newport;
477 int len = urb->actual_length;
478
479 if (!len)
480 return;
481
482 ch = urb->transfer_buffer;
483 serial = urb->context;
484 serial_priv = usb_get_serial_data(serial);
485 port = serial->port[serial_priv->current_port];
486
487 for (i = 0; i < urb->actual_length; i++) {
488 ch = (unsigned char *)urb->transfer_buffer + i;
489 if ((i <= (len - 3)) &&
490 (*ch == QT2_CONTROL_BYTE) &&
491 (*(ch + 1) == QT2_CONTROL_BYTE)) {
492 escapeflag = false;
493 switch (*(ch + 2)) {
494 case QT2_LINE_STATUS:
495 case QT2_MODEM_STATUS:
496 if (i > (len - 4)) {
497 dev_warn(&port->dev,
498 "%s - status message too short\n",
499 __func__);
500 break;
501 }
502 qt2_process_status(port, ch + 2);
503 i += 3;
504 escapeflag = true;
505 break;
506 case QT2_XMIT_HOLD:
507 if (i > (len - 5)) {
508 dev_warn(&port->dev,
509 "%s - xmit_empty message too short\n",
510 __func__);
511 break;
512 }
513
514 i += 4;
515 escapeflag = true;
516 break;
517 case QT2_CHANGE_PORT:
518 if (i > (len - 4)) {
519 dev_warn(&port->dev,
520 "%s - change_port message too short\n",
521 __func__);
522 break;
523 }
524 tty_flip_buffer_push(&port->port);
525
526 newport = *(ch + 3);
527
528 if (newport > serial->num_ports) {
529 dev_err(&port->dev,
530 "%s - port change to invalid port: %i\n",
531 __func__, newport);
532 break;
533 }
534
535 serial_priv->current_port = newport;
536 port = serial->port[serial_priv->current_port];
537 i += 3;
538 escapeflag = true;
539 break;
540 case QT2_REC_FLUSH:
541 case QT2_XMIT_FLUSH:
542 i += 2;
543 escapeflag = true;
544 break;
545 case QT2_CONTROL_ESCAPE:
546 tty_insert_flip_string(&port->port, ch, 2);
547 i += 2;
548 escapeflag = true;
549 break;
550 default:
551 dev_warn(&port->dev,
552 "%s - unsupported command %i\n",
553 __func__, *(ch + 2));
554 break;
555 }
556 if (escapeflag)
557 continue;
558 }
559
560 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
561 }
562
563 tty_flip_buffer_push(&port->port);
564}
565
566static void qt2_write_bulk_callback(struct urb *urb)
567{
568 struct usb_serial_port *port;
569 struct qt2_port_private *port_priv;
570 unsigned long flags;
571
572 port = urb->context;
573 port_priv = usb_get_serial_port_data(port);
574
575 spin_lock_irqsave(&port_priv->urb_lock, flags);
576
577 port_priv->urb_in_use = false;
578 usb_serial_port_softint(port);
579
580 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
581
582}
583
584static void qt2_read_bulk_callback(struct urb *urb)
585{
586 struct usb_serial *serial = urb->context;
587 int status;
588
589 if (urb->status) {
590 dev_warn(&serial->dev->dev,
591 "%s - non-zero urb status: %i\n", __func__,
592 urb->status);
593 return;
594 }
595
596 qt2_process_read_urb(urb);
597
598 status = usb_submit_urb(urb, GFP_ATOMIC);
599 if (status != 0)
600 dev_err(&serial->dev->dev,
601 "%s - resubmit read urb failed: %i\n",
602 __func__, status);
603}
604
605static int qt2_setup_urbs(struct usb_serial *serial)
606{
607 struct usb_serial_port *port0;
608 struct qt2_serial_private *serial_priv;
609 int status;
610
611 port0 = serial->port[0];
612
613 serial_priv = usb_get_serial_data(serial);
614 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
615 if (!serial_priv->read_urb)
616 return -ENOMEM;
617
618 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
619 usb_rcvbulkpipe(serial->dev,
620 port0->bulk_in_endpointAddress),
621 serial_priv->read_buffer,
622 QT2_READ_BUFFER_SIZE,
623 qt2_read_bulk_callback, serial);
624
625 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
626 if (status != 0) {
627 dev_err(&serial->dev->dev,
628 "%s - submit read urb failed %i\n", __func__, status);
629 usb_free_urb(serial_priv->read_urb);
630 return status;
631 }
632
633 return 0;
634}
635
636static int qt2_attach(struct usb_serial *serial)
637{
638 struct qt2_serial_private *serial_priv;
639 int status;
640
641
642 status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
643 0xc2, 0x40, 0x8000, 0, NULL, 0,
644 QT2_USB_TIMEOUT);
645 if (status < 0) {
646 dev_err(&serial->dev->dev,
647 "%s - failed to power on unit: %i\n", __func__, status);
648 return status;
649 }
650
651 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
652 if (!serial_priv)
653 return -ENOMEM;
654
655 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
656 if (!serial_priv->read_buffer) {
657 status = -ENOMEM;
658 goto err_buf;
659 }
660
661 usb_set_serial_data(serial, serial_priv);
662
663 status = qt2_setup_urbs(serial);
664 if (status != 0)
665 goto attach_failed;
666
667 return 0;
668
669attach_failed:
670 kfree(serial_priv->read_buffer);
671err_buf:
672 kfree(serial_priv);
673 return status;
674}
675
676static int qt2_port_probe(struct usb_serial_port *port)
677{
678 struct usb_serial *serial = port->serial;
679 struct qt2_port_private *port_priv;
680 u8 bEndpointAddress;
681
682 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
683 if (!port_priv)
684 return -ENOMEM;
685
686 spin_lock_init(&port_priv->lock);
687 spin_lock_init(&port_priv->urb_lock);
688 port_priv->port = port;
689
690 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
691 if (!port_priv->write_buffer)
692 goto err_buf;
693
694 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
695 if (!port_priv->write_urb)
696 goto err_urb;
697
698 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
699 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
700 usb_sndbulkpipe(serial->dev, bEndpointAddress),
701 port_priv->write_buffer,
702 QT2_WRITE_BUFFER_SIZE,
703 qt2_write_bulk_callback, port);
704
705 usb_set_serial_port_data(port, port_priv);
706
707 return 0;
708err_urb:
709 kfree(port_priv->write_buffer);
710err_buf:
711 kfree(port_priv);
712 return -ENOMEM;
713}
714
715static void qt2_port_remove(struct usb_serial_port *port)
716{
717 struct qt2_port_private *port_priv;
718
719 port_priv = usb_get_serial_port_data(port);
720 usb_free_urb(port_priv->write_urb);
721 kfree(port_priv->write_buffer);
722 kfree(port_priv);
723}
724
725static int qt2_tiocmget(struct tty_struct *tty)
726{
727 struct usb_serial_port *port = tty->driver_data;
728 struct usb_device *dev = port->serial->dev;
729 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
730 u8 *d;
731 int r;
732
733 d = kzalloc(2, GFP_KERNEL);
734 if (!d)
735 return -ENOMEM;
736
737 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
738 if (r < 0)
739 goto mget_out;
740
741 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
742 if (r < 0)
743 goto mget_out;
744
745 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
746 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
747 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
748 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
749 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
750 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
751
752mget_out:
753 kfree(d);
754 return r;
755}
756
757static int qt2_tiocmset(struct tty_struct *tty,
758 unsigned int set, unsigned int clear)
759{
760 struct qt2_port_private *port_priv;
761
762 port_priv = usb_get_serial_port_data(tty->driver_data);
763 return update_mctrl(port_priv, set, clear);
764}
765
766static void qt2_break_ctl(struct tty_struct *tty, int break_state)
767{
768 struct usb_serial_port *port = tty->driver_data;
769 struct qt2_port_private *port_priv;
770 int status;
771 u16 val;
772
773 port_priv = usb_get_serial_port_data(port);
774
775 val = (break_state == -1) ? 1 : 0;
776
777 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
778 val, port_priv->device_port);
779 if (status < 0)
780 dev_warn(&port->dev,
781 "%s - failed to send control message: %i\n", __func__,
782 status);
783}
784
785
786
787static void qt2_dtr_rts(struct usb_serial_port *port, int on)
788{
789 struct usb_device *dev = port->serial->dev;
790 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
791
792
793 if (!on) {
794 if (qt2_setregister(dev, port_priv->device_port,
795 UART_MCR, 0) < 0)
796 dev_warn(&port->dev, "error from flowcontrol urb\n");
797 }
798
799 if (on)
800 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
801 else
802 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
803}
804
805static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
806{
807 struct qt2_port_private *port_priv;
808 u8 newMSR = (u8) *ch;
809 unsigned long flags;
810
811
812 port_priv = usb_get_serial_port_data(port);
813 if (!port_priv)
814 return;
815
816 spin_lock_irqsave(&port_priv->lock, flags);
817 port_priv->shadowMSR = newMSR;
818 spin_unlock_irqrestore(&port_priv->lock, flags);
819
820 if (newMSR & UART_MSR_ANY_DELTA) {
821
822 if (newMSR & UART_MSR_DCTS)
823 port->icount.cts++;
824 if (newMSR & UART_MSR_DDSR)
825 port->icount.dsr++;
826 if (newMSR & UART_MSR_DDCD)
827 port->icount.dcd++;
828 if (newMSR & UART_MSR_TERI)
829 port->icount.rng++;
830
831 wake_up_interruptible(&port->port.delta_msr_wait);
832 }
833}
834
835static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
836{
837 struct qt2_port_private *port_priv;
838 struct async_icount *icount;
839 unsigned long flags;
840 u8 newLSR = (u8) *ch;
841
842
843 port_priv = usb_get_serial_port_data(port);
844 if (!port_priv)
845 return;
846
847 if (newLSR & UART_LSR_BI)
848 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
849
850 spin_lock_irqsave(&port_priv->lock, flags);
851 port_priv->shadowLSR = newLSR;
852 spin_unlock_irqrestore(&port_priv->lock, flags);
853
854 icount = &port->icount;
855
856 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
857
858 if (newLSR & UART_LSR_BI)
859 icount->brk++;
860
861 if (newLSR & UART_LSR_OE)
862 icount->overrun++;
863
864 if (newLSR & UART_LSR_PE)
865 icount->parity++;
866
867 if (newLSR & UART_LSR_FE)
868 icount->frame++;
869 }
870
871}
872
873static unsigned int qt2_write_room(struct tty_struct *tty)
874{
875 struct usb_serial_port *port = tty->driver_data;
876 struct qt2_port_private *port_priv;
877 unsigned long flags;
878 unsigned int r;
879
880 port_priv = usb_get_serial_port_data(port);
881
882 spin_lock_irqsave(&port_priv->urb_lock, flags);
883
884 if (port_priv->urb_in_use)
885 r = 0;
886 else
887 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
888
889 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
890
891 return r;
892}
893
894static int qt2_write(struct tty_struct *tty,
895 struct usb_serial_port *port,
896 const unsigned char *buf, int count)
897{
898 struct qt2_port_private *port_priv;
899 struct urb *write_urb;
900 unsigned char *data;
901 unsigned long flags;
902 int status;
903 int bytes_out = 0;
904
905 port_priv = usb_get_serial_port_data(port);
906
907 if (port_priv->write_urb == NULL) {
908 dev_err(&port->dev, "%s - no output urb\n", __func__);
909 return 0;
910 }
911 write_urb = port_priv->write_urb;
912
913 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
914
915 data = write_urb->transfer_buffer;
916 spin_lock_irqsave(&port_priv->urb_lock, flags);
917 if (port_priv->urb_in_use) {
918 dev_err(&port->dev, "qt2_write - urb is in use\n");
919 goto write_out;
920 }
921
922 *data++ = QT2_CONTROL_BYTE;
923 *data++ = QT2_CONTROL_BYTE;
924 *data++ = port_priv->device_port;
925 put_unaligned_le16(count, data);
926 data += 2;
927 memcpy(data, buf, count);
928
929 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
930
931 status = usb_submit_urb(write_urb, GFP_ATOMIC);
932 if (status == 0) {
933 port_priv->urb_in_use = true;
934 bytes_out += count;
935 }
936
937write_out:
938 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
939 return bytes_out;
940}
941
942
943static struct usb_serial_driver qt2_device = {
944 .driver = {
945 .owner = THIS_MODULE,
946 .name = "quatech-serial",
947 },
948 .description = DRIVER_DESC,
949 .id_table = id_table,
950 .open = qt2_open,
951 .close = qt2_close,
952 .write = qt2_write,
953 .write_room = qt2_write_room,
954 .calc_num_ports = qt2_calc_num_ports,
955 .attach = qt2_attach,
956 .release = qt2_release,
957 .disconnect = qt2_disconnect,
958 .port_probe = qt2_port_probe,
959 .port_remove = qt2_port_remove,
960 .dtr_rts = qt2_dtr_rts,
961 .break_ctl = qt2_break_ctl,
962 .tiocmget = qt2_tiocmget,
963 .tiocmset = qt2_tiocmset,
964 .tiocmiwait = usb_serial_generic_tiocmiwait,
965 .get_icount = usb_serial_generic_get_icount,
966 .set_termios = qt2_set_termios,
967};
968
969static struct usb_serial_driver *const serial_drivers[] = {
970 &qt2_device, NULL
971};
972
973module_usb_serial_driver(serial_drivers, id_table);
974
975MODULE_DESCRIPTION(DRIVER_DESC);
976MODULE_LICENSE("GPL v2");
977
