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
75 struct 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
84 static 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
95 static 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 };
105 MODULE_DEVICE_TABLE(usb, id_table);
106
107 struct 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
114 struct 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
129 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
130 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
131 static void qt2_write_bulk_callback(struct urb *urb);
132 static void qt2_read_bulk_callback(struct urb *urb);
133
qt2_release(struct usb_serial * serial)134 static 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
calc_baud_divisor(int baudrate)146 static 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
qt2_set_port_config(struct usb_device * dev,unsigned char port_number,u16 baudrate,u16 lcr)159 static 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
qt2_control_msg(struct usb_device * dev,u8 request,u16 data,u16 index)171 static 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
qt2_setdevice(struct usb_device * dev,u8 * data)179 static 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
qt2_getregister(struct usb_device * dev,u8 uart,u8 reg,u8 * data)187 static 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
qt2_setregister(struct usb_device * dev,u8 uart,u8 reg,u16 data)205 static 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
update_mctrl(struct qt2_port_private * port_priv,unsigned int set,unsigned int clear)215 static 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
qt2_calc_num_ports(struct usb_serial * serial,struct usb_serial_endpoints * epds)245 static 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
qt2_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)263 static void qt2_set_termios(struct tty_struct *tty,
264 struct usb_serial_port *port,
265 const 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 new_lcr |= UART_LCR_WLEN(tty_get_char_size(cflag));
285
286 baud = tty_get_baud_rate(tty);
287 if (!baud)
288 baud = 9600;
289
290 status = qt2_set_port_config(dev, port_priv->device_port, baud,
291 new_lcr);
292 if (status < 0)
293 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
294 __func__, status);
295
296 if (cflag & CRTSCTS)
297 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
298 SERIAL_CRTSCTS,
299 port_priv->device_port);
300 else
301 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
302 0, port_priv->device_port);
303 if (status < 0)
304 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
305 __func__, status);
306
307 if (I_IXOFF(tty) || I_IXON(tty)) {
308 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
309
310 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
311 x, port_priv->device_port);
312 } else
313 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
314 0, port_priv->device_port);
315
316 if (status < 0)
317 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
318 __func__, status);
319
320 }
321
qt2_open(struct tty_struct * tty,struct usb_serial_port * port)322 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
323 {
324 struct usb_serial *serial;
325 struct qt2_port_private *port_priv;
326 u8 *data;
327 u16 device_port;
328 int status;
329 unsigned long flags;
330
331 device_port = port->port_number;
332
333 serial = port->serial;
334
335 port_priv = usb_get_serial_port_data(port);
336
337 /* set the port to RS232 mode */
338 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
339 QT2_QMCR_RS232, device_port);
340 if (status < 0) {
341 dev_err(&port->dev,
342 "%s failed to set RS232 mode for port %i error %i\n",
343 __func__, device_port, status);
344 return status;
345 }
346
347 data = kzalloc(2, GFP_KERNEL);
348 if (!data)
349 return -ENOMEM;
350
351 /* open the port */
352 status = usb_control_msg(serial->dev,
353 usb_rcvctrlpipe(serial->dev, 0),
354 QT_OPEN_CLOSE_CHANNEL,
355 0xc0, 0,
356 device_port, data, 2, QT2_USB_TIMEOUT);
357
358 if (status < 2) {
359 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
360 status);
361 if (status >= 0)
362 status = -EIO;
363 kfree(data);
364 return status;
365 }
366
367 spin_lock_irqsave(&port_priv->lock, flags);
368 port_priv->shadowLSR = data[0];
369 port_priv->shadowMSR = data[1];
370 spin_unlock_irqrestore(&port_priv->lock, flags);
371
372 kfree(data);
373
374 /* set to default speed and 8bit word size */
375 status = qt2_set_port_config(serial->dev, device_port,
376 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
377 if (status < 0) {
378 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
379 __func__, device_port);
380 return status;
381 }
382
383 port_priv->device_port = (u8) device_port;
384
385 if (tty)
386 qt2_set_termios(tty, port, &tty->termios);
387
388 return 0;
389
390 }
391
qt2_close(struct usb_serial_port * port)392 static void qt2_close(struct usb_serial_port *port)
393 {
394 struct usb_serial *serial;
395 struct qt2_port_private *port_priv;
396 int i;
397
398 serial = port->serial;
399 port_priv = usb_get_serial_port_data(port);
400
401 usb_kill_urb(port_priv->write_urb);
402
403 /* flush the port transmit buffer */
404 i = usb_control_msg(serial->dev,
405 usb_sndctrlpipe(serial->dev, 0),
406 QT2_FLUSH_DEVICE, 0x40, 1,
407 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
408
409 if (i < 0)
410 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
411 __func__, i);
412
413 /* flush the port receive buffer */
414 i = usb_control_msg(serial->dev,
415 usb_sndctrlpipe(serial->dev, 0),
416 QT2_FLUSH_DEVICE, 0x40, 0,
417 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
418
419 if (i < 0)
420 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
421 __func__, i);
422
423 /* close the port */
424 i = usb_control_msg(serial->dev,
425 usb_sndctrlpipe(serial->dev, 0),
426 QT_OPEN_CLOSE_CHANNEL,
427 0x40, 0,
428 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
429
430 if (i < 0)
431 dev_err(&port->dev, "%s - close port failed %i\n",
432 __func__, i);
433 }
434
qt2_disconnect(struct usb_serial * serial)435 static void qt2_disconnect(struct usb_serial *serial)
436 {
437 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
438
439 usb_kill_urb(serial_priv->read_urb);
440 }
441
qt2_process_status(struct usb_serial_port * port,unsigned char * ch)442 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
443 {
444 switch (*ch) {
445 case QT2_LINE_STATUS:
446 qt2_update_lsr(port, ch + 1);
447 break;
448 case QT2_MODEM_STATUS:
449 qt2_update_msr(port, ch + 1);
450 break;
451 }
452 }
453
qt2_process_read_urb(struct urb * urb)454 static void qt2_process_read_urb(struct urb *urb)
455 {
456 struct usb_serial *serial;
457 struct qt2_serial_private *serial_priv;
458 struct usb_serial_port *port;
459 bool escapeflag;
460 unsigned char *ch;
461 int i;
462 unsigned char newport;
463 int len = urb->actual_length;
464
465 if (!len)
466 return;
467
468 ch = urb->transfer_buffer;
469 serial = urb->context;
470 serial_priv = usb_get_serial_data(serial);
471 port = serial->port[serial_priv->current_port];
472
473 for (i = 0; i < urb->actual_length; i++) {
474 ch = (unsigned char *)urb->transfer_buffer + i;
475 if ((i <= (len - 3)) &&
476 (*ch == QT2_CONTROL_BYTE) &&
477 (*(ch + 1) == QT2_CONTROL_BYTE)) {
478 escapeflag = false;
479 switch (*(ch + 2)) {
480 case QT2_LINE_STATUS:
481 case QT2_MODEM_STATUS:
482 if (i > (len - 4)) {
483 dev_warn(&port->dev,
484 "%s - status message too short\n",
485 __func__);
486 break;
487 }
488 qt2_process_status(port, ch + 2);
489 i += 3;
490 escapeflag = true;
491 break;
492 case QT2_XMIT_HOLD:
493 if (i > (len - 5)) {
494 dev_warn(&port->dev,
495 "%s - xmit_empty message too short\n",
496 __func__);
497 break;
498 }
499 /* bytes_written = (ch[1] << 4) + ch[0]; */
500 i += 4;
501 escapeflag = true;
502 break;
503 case QT2_CHANGE_PORT:
504 if (i > (len - 4)) {
505 dev_warn(&port->dev,
506 "%s - change_port message too short\n",
507 __func__);
508 break;
509 }
510 tty_flip_buffer_push(&port->port);
511
512 newport = *(ch + 3);
513
514 if (newport > serial->num_ports) {
515 dev_err(&port->dev,
516 "%s - port change to invalid port: %i\n",
517 __func__, newport);
518 break;
519 }
520
521 serial_priv->current_port = newport;
522 port = serial->port[serial_priv->current_port];
523 i += 3;
524 escapeflag = true;
525 break;
526 case QT2_REC_FLUSH:
527 case QT2_XMIT_FLUSH:
528 i += 2;
529 escapeflag = true;
530 break;
531 case QT2_CONTROL_ESCAPE:
532 tty_insert_flip_string(&port->port, ch, 2);
533 i += 2;
534 escapeflag = true;
535 break;
536 default:
537 dev_warn(&port->dev,
538 "%s - unsupported command %i\n",
539 __func__, *(ch + 2));
540 break;
541 }
542 if (escapeflag)
543 continue;
544 }
545
546 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
547 }
548
549 tty_flip_buffer_push(&port->port);
550 }
551
qt2_write_bulk_callback(struct urb * urb)552 static void qt2_write_bulk_callback(struct urb *urb)
553 {
554 struct usb_serial_port *port;
555 struct qt2_port_private *port_priv;
556 unsigned long flags;
557
558 port = urb->context;
559 port_priv = usb_get_serial_port_data(port);
560
561 spin_lock_irqsave(&port_priv->urb_lock, flags);
562
563 port_priv->urb_in_use = false;
564 usb_serial_port_softint(port);
565
566 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
567
568 }
569
qt2_read_bulk_callback(struct urb * urb)570 static void qt2_read_bulk_callback(struct urb *urb)
571 {
572 struct usb_serial *serial = urb->context;
573 int status;
574
575 if (urb->status) {
576 dev_warn(&serial->dev->dev,
577 "%s - non-zero urb status: %i\n", __func__,
578 urb->status);
579 return;
580 }
581
582 qt2_process_read_urb(urb);
583
584 status = usb_submit_urb(urb, GFP_ATOMIC);
585 if (status != 0)
586 dev_err(&serial->dev->dev,
587 "%s - resubmit read urb failed: %i\n",
588 __func__, status);
589 }
590
qt2_setup_urbs(struct usb_serial * serial)591 static int qt2_setup_urbs(struct usb_serial *serial)
592 {
593 struct usb_serial_port *port0;
594 struct qt2_serial_private *serial_priv;
595 int status;
596
597 port0 = serial->port[0];
598
599 serial_priv = usb_get_serial_data(serial);
600 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
601 if (!serial_priv->read_urb)
602 return -ENOMEM;
603
604 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
605 usb_rcvbulkpipe(serial->dev,
606 port0->bulk_in_endpointAddress),
607 serial_priv->read_buffer,
608 QT2_READ_BUFFER_SIZE,
609 qt2_read_bulk_callback, serial);
610
611 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
612 if (status != 0) {
613 dev_err(&serial->dev->dev,
614 "%s - submit read urb failed %i\n", __func__, status);
615 usb_free_urb(serial_priv->read_urb);
616 return status;
617 }
618
619 return 0;
620 }
621
qt2_attach(struct usb_serial * serial)622 static int qt2_attach(struct usb_serial *serial)
623 {
624 struct qt2_serial_private *serial_priv;
625 int status;
626
627 /* power on unit */
628 status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
629 0xc2, 0x40, 0x8000, 0, NULL, 0,
630 QT2_USB_TIMEOUT);
631 if (status < 0) {
632 dev_err(&serial->dev->dev,
633 "%s - failed to power on unit: %i\n", __func__, status);
634 return status;
635 }
636
637 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
638 if (!serial_priv)
639 return -ENOMEM;
640
641 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
642 if (!serial_priv->read_buffer) {
643 status = -ENOMEM;
644 goto err_buf;
645 }
646
647 usb_set_serial_data(serial, serial_priv);
648
649 status = qt2_setup_urbs(serial);
650 if (status != 0)
651 goto attach_failed;
652
653 return 0;
654
655 attach_failed:
656 kfree(serial_priv->read_buffer);
657 err_buf:
658 kfree(serial_priv);
659 return status;
660 }
661
qt2_port_probe(struct usb_serial_port * port)662 static int qt2_port_probe(struct usb_serial_port *port)
663 {
664 struct usb_serial *serial = port->serial;
665 struct qt2_port_private *port_priv;
666 u8 bEndpointAddress;
667
668 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
669 if (!port_priv)
670 return -ENOMEM;
671
672 spin_lock_init(&port_priv->lock);
673 spin_lock_init(&port_priv->urb_lock);
674 port_priv->port = port;
675
676 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
677 if (!port_priv->write_buffer)
678 goto err_buf;
679
680 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
681 if (!port_priv->write_urb)
682 goto err_urb;
683
684 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
685 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
686 usb_sndbulkpipe(serial->dev, bEndpointAddress),
687 port_priv->write_buffer,
688 QT2_WRITE_BUFFER_SIZE,
689 qt2_write_bulk_callback, port);
690
691 usb_set_serial_port_data(port, port_priv);
692
693 return 0;
694 err_urb:
695 kfree(port_priv->write_buffer);
696 err_buf:
697 kfree(port_priv);
698 return -ENOMEM;
699 }
700
qt2_port_remove(struct usb_serial_port * port)701 static void qt2_port_remove(struct usb_serial_port *port)
702 {
703 struct qt2_port_private *port_priv;
704
705 port_priv = usb_get_serial_port_data(port);
706 usb_free_urb(port_priv->write_urb);
707 kfree(port_priv->write_buffer);
708 kfree(port_priv);
709 }
710
qt2_tiocmget(struct tty_struct * tty)711 static int qt2_tiocmget(struct tty_struct *tty)
712 {
713 struct usb_serial_port *port = tty->driver_data;
714 struct usb_device *dev = port->serial->dev;
715 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
716 u8 *d;
717 int r;
718
719 d = kzalloc(2, GFP_KERNEL);
720 if (!d)
721 return -ENOMEM;
722
723 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
724 if (r < 0)
725 goto mget_out;
726
727 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
728 if (r < 0)
729 goto mget_out;
730
731 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
732 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
733 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
734 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
735 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
736 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
737
738 mget_out:
739 kfree(d);
740 return r;
741 }
742
qt2_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)743 static int qt2_tiocmset(struct tty_struct *tty,
744 unsigned int set, unsigned int clear)
745 {
746 struct qt2_port_private *port_priv;
747
748 port_priv = usb_get_serial_port_data(tty->driver_data);
749 return update_mctrl(port_priv, set, clear);
750 }
751
qt2_break_ctl(struct tty_struct * tty,int break_state)752 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
753 {
754 struct usb_serial_port *port = tty->driver_data;
755 struct qt2_port_private *port_priv;
756 int status;
757 u16 val;
758
759 port_priv = usb_get_serial_port_data(port);
760
761 val = (break_state == -1) ? 1 : 0;
762
763 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
764 val, port_priv->device_port);
765 if (status < 0)
766 dev_warn(&port->dev,
767 "%s - failed to send control message: %i\n", __func__,
768 status);
769 }
770
771
772
qt2_dtr_rts(struct usb_serial_port * port,int on)773 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
774 {
775 struct usb_device *dev = port->serial->dev;
776 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
777
778 /* Disable flow control */
779 if (!on) {
780 if (qt2_setregister(dev, port_priv->device_port,
781 UART_MCR, 0) < 0)
782 dev_warn(&port->dev, "error from flowcontrol urb\n");
783 }
784 /* drop RTS and DTR */
785 if (on)
786 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
787 else
788 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
789 }
790
qt2_update_msr(struct usb_serial_port * port,unsigned char * ch)791 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
792 {
793 struct qt2_port_private *port_priv;
794 u8 newMSR = (u8) *ch;
795 unsigned long flags;
796
797 /* May be called from qt2_process_read_urb() for an unbound port. */
798 port_priv = usb_get_serial_port_data(port);
799 if (!port_priv)
800 return;
801
802 spin_lock_irqsave(&port_priv->lock, flags);
803 port_priv->shadowMSR = newMSR;
804 spin_unlock_irqrestore(&port_priv->lock, flags);
805
806 if (newMSR & UART_MSR_ANY_DELTA) {
807 /* update input line counters */
808 if (newMSR & UART_MSR_DCTS)
809 port->icount.cts++;
810 if (newMSR & UART_MSR_DDSR)
811 port->icount.dsr++;
812 if (newMSR & UART_MSR_DDCD)
813 port->icount.dcd++;
814 if (newMSR & UART_MSR_TERI)
815 port->icount.rng++;
816
817 wake_up_interruptible(&port->port.delta_msr_wait);
818 }
819 }
820
qt2_update_lsr(struct usb_serial_port * port,unsigned char * ch)821 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
822 {
823 struct qt2_port_private *port_priv;
824 struct async_icount *icount;
825 unsigned long flags;
826 u8 newLSR = (u8) *ch;
827
828 /* May be called from qt2_process_read_urb() for an unbound port. */
829 port_priv = usb_get_serial_port_data(port);
830 if (!port_priv)
831 return;
832
833 if (newLSR & UART_LSR_BI)
834 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
835
836 spin_lock_irqsave(&port_priv->lock, flags);
837 port_priv->shadowLSR = newLSR;
838 spin_unlock_irqrestore(&port_priv->lock, flags);
839
840 icount = &port->icount;
841
842 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
843
844 if (newLSR & UART_LSR_BI)
845 icount->brk++;
846
847 if (newLSR & UART_LSR_OE)
848 icount->overrun++;
849
850 if (newLSR & UART_LSR_PE)
851 icount->parity++;
852
853 if (newLSR & UART_LSR_FE)
854 icount->frame++;
855 }
856
857 }
858
qt2_write_room(struct tty_struct * tty)859 static unsigned int qt2_write_room(struct tty_struct *tty)
860 {
861 struct usb_serial_port *port = tty->driver_data;
862 struct qt2_port_private *port_priv;
863 unsigned long flags;
864 unsigned int r;
865
866 port_priv = usb_get_serial_port_data(port);
867
868 spin_lock_irqsave(&port_priv->urb_lock, flags);
869
870 if (port_priv->urb_in_use)
871 r = 0;
872 else
873 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
874
875 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
876
877 return r;
878 }
879
qt2_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)880 static int qt2_write(struct tty_struct *tty,
881 struct usb_serial_port *port,
882 const unsigned char *buf, int count)
883 {
884 struct qt2_port_private *port_priv;
885 struct urb *write_urb;
886 unsigned char *data;
887 unsigned long flags;
888 int status;
889 int bytes_out = 0;
890
891 port_priv = usb_get_serial_port_data(port);
892
893 if (port_priv->write_urb == NULL) {
894 dev_err(&port->dev, "%s - no output urb\n", __func__);
895 return 0;
896 }
897 write_urb = port_priv->write_urb;
898
899 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
900
901 data = write_urb->transfer_buffer;
902 spin_lock_irqsave(&port_priv->urb_lock, flags);
903 if (port_priv->urb_in_use) {
904 dev_err(&port->dev, "qt2_write - urb is in use\n");
905 goto write_out;
906 }
907
908 *data++ = QT2_CONTROL_BYTE;
909 *data++ = QT2_CONTROL_BYTE;
910 *data++ = port_priv->device_port;
911 put_unaligned_le16(count, data);
912 data += 2;
913 memcpy(data, buf, count);
914
915 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
916
917 status = usb_submit_urb(write_urb, GFP_ATOMIC);
918 if (status == 0) {
919 port_priv->urb_in_use = true;
920 bytes_out += count;
921 }
922
923 write_out:
924 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
925 return bytes_out;
926 }
927
928
929 static struct usb_serial_driver qt2_device = {
930 .driver = {
931 .owner = THIS_MODULE,
932 .name = "quatech-serial",
933 },
934 .description = DRIVER_DESC,
935 .id_table = id_table,
936 .open = qt2_open,
937 .close = qt2_close,
938 .write = qt2_write,
939 .write_room = qt2_write_room,
940 .calc_num_ports = qt2_calc_num_ports,
941 .attach = qt2_attach,
942 .release = qt2_release,
943 .disconnect = qt2_disconnect,
944 .port_probe = qt2_port_probe,
945 .port_remove = qt2_port_remove,
946 .dtr_rts = qt2_dtr_rts,
947 .break_ctl = qt2_break_ctl,
948 .tiocmget = qt2_tiocmget,
949 .tiocmset = qt2_tiocmset,
950 .tiocmiwait = usb_serial_generic_tiocmiwait,
951 .get_icount = usb_serial_generic_get_icount,
952 .set_termios = qt2_set_termios,
953 };
954
955 static struct usb_serial_driver *const serial_drivers[] = {
956 &qt2_device, NULL
957 };
958
959 module_usb_serial_driver(serial_drivers, id_table);
960
961 MODULE_DESCRIPTION(DRIVER_DESC);
962 MODULE_LICENSE("GPL v2");
963
