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