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
79 struct 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
88 static 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
99 static 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 };
109 MODULE_DEVICE_TABLE(usb, id_table);
110
111 struct 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
118 struct 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
133 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
134 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
135 static void qt2_write_bulk_callback(struct urb *urb);
136 static void qt2_read_bulk_callback(struct urb *urb);
137
qt2_release(struct usb_serial * serial)138 static 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_kill_urb(serial_priv->read_urb);
145 usb_free_urb(serial_priv->read_urb);
146 kfree(serial_priv->read_buffer);
147 kfree(serial_priv);
148 }
149
calc_baud_divisor(int baudrate)150 static inline int calc_baud_divisor(int baudrate)
151 {
152 int divisor, rem;
153
154 divisor = MAX_BAUD_RATE / baudrate;
155 rem = MAX_BAUD_RATE % baudrate;
156 /* Round to nearest divisor */
157 if (((rem * 2) >= baudrate) && (baudrate != 110))
158 divisor++;
159
160 return divisor;
161 }
162
qt2_set_port_config(struct usb_device * dev,unsigned char port_number,u16 baudrate,u16 lcr)163 static inline int qt2_set_port_config(struct usb_device *dev,
164 unsigned char port_number,
165 u16 baudrate, u16 lcr)
166 {
167 int divisor = calc_baud_divisor(baudrate);
168 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
169
170 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
171 QT2_GET_SET_UART, 0x40,
172 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
173 }
174
qt2_control_msg(struct usb_device * dev,u8 request,u16 data,u16 index)175 static inline int qt2_control_msg(struct usb_device *dev,
176 u8 request, u16 data, u16 index)
177 {
178 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
179 request, 0x40, data, index,
180 NULL, 0, QT2_USB_TIMEOUT);
181 }
182
qt2_setdevice(struct usb_device * dev,u8 * data)183 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
184 {
185 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
186
187 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
188 }
189
190
qt2_getregister(struct usb_device * dev,u8 uart,u8 reg,u8 * data)191 static inline int qt2_getregister(struct usb_device *dev,
192 u8 uart,
193 u8 reg,
194 u8 *data)
195 {
196 int ret;
197
198 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
199 QT_SET_GET_REGISTER, 0xc0, reg,
200 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
201 if (ret < sizeof(*data)) {
202 if (ret >= 0)
203 ret = -EIO;
204 }
205
206 return ret;
207 }
208
qt2_setregister(struct usb_device * dev,u8 uart,u8 reg,u16 data)209 static inline int qt2_setregister(struct usb_device *dev,
210 u8 uart, u8 reg, u16 data)
211 {
212 u16 value = (data << 8) | reg;
213
214 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
215 QT_SET_GET_REGISTER, 0x40, value, uart,
216 NULL, 0, QT2_USB_TIMEOUT);
217 }
218
update_mctrl(struct qt2_port_private * port_priv,unsigned int set,unsigned int clear)219 static inline int update_mctrl(struct qt2_port_private *port_priv,
220 unsigned int set, unsigned int clear)
221 {
222 struct usb_serial_port *port = port_priv->port;
223 struct usb_device *dev = port->serial->dev;
224 unsigned urb_value;
225 int status;
226
227 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
228 dev_dbg(&port->dev,
229 "update_mctrl - DTR|RTS not being set|cleared\n");
230 return 0; /* no change */
231 }
232
233 clear &= ~set; /* 'set' takes precedence over 'clear' */
234 urb_value = 0;
235 if (set & TIOCM_DTR)
236 urb_value |= UART_MCR_DTR;
237 if (set & TIOCM_RTS)
238 urb_value |= UART_MCR_RTS;
239
240 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
241 urb_value);
242 if (status < 0)
243 dev_err(&port->dev,
244 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
245 status);
246 return status;
247 }
248
qt2_calc_num_ports(struct usb_serial * serial)249 static int qt2_calc_num_ports(struct usb_serial *serial)
250 {
251 struct qt2_device_detail d;
252 int i;
253
254 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
255 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
256 return d.num_ports;
257 }
258
259 /* we didn't recognize the device */
260 dev_err(&serial->dev->dev,
261 "don't know the number of ports, assuming 1\n");
262
263 return 1;
264 }
265
qt2_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)266 static void qt2_set_termios(struct tty_struct *tty,
267 struct usb_serial_port *port,
268 struct ktermios *old_termios)
269 {
270 struct usb_device *dev = port->serial->dev;
271 struct qt2_port_private *port_priv;
272 struct ktermios *termios = &tty->termios;
273 u16 baud;
274 unsigned int cflag = termios->c_cflag;
275 u16 new_lcr = 0;
276 int status;
277
278 port_priv = usb_get_serial_port_data(port);
279
280 if (cflag & PARENB) {
281 if (cflag & PARODD)
282 new_lcr |= UART_LCR_PARITY;
283 else
284 new_lcr |= SERIAL_EVEN_PARITY;
285 }
286
287 switch (cflag & CSIZE) {
288 case CS5:
289 new_lcr |= UART_LCR_WLEN5;
290 break;
291 case CS6:
292 new_lcr |= UART_LCR_WLEN6;
293 break;
294 case CS7:
295 new_lcr |= UART_LCR_WLEN7;
296 break;
297 default:
298 case CS8:
299 new_lcr |= UART_LCR_WLEN8;
300 break;
301 }
302
303 baud = tty_get_baud_rate(tty);
304 if (!baud)
305 baud = 9600;
306
307 status = qt2_set_port_config(dev, port_priv->device_port, baud,
308 new_lcr);
309 if (status < 0)
310 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
311 __func__, status);
312
313 if (cflag & CRTSCTS)
314 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
315 SERIAL_CRTSCTS,
316 port_priv->device_port);
317 else
318 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
319 0, port_priv->device_port);
320 if (status < 0)
321 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
322 __func__, status);
323
324 if (I_IXOFF(tty) || I_IXON(tty)) {
325 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
326
327 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
328 x, port_priv->device_port);
329 } else
330 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
331 0, port_priv->device_port);
332
333 if (status < 0)
334 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
335 __func__, status);
336
337 }
338
qt2_open(struct tty_struct * tty,struct usb_serial_port * port)339 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
340 {
341 struct usb_serial *serial;
342 struct qt2_port_private *port_priv;
343 u8 *data;
344 u16 device_port;
345 int status;
346 unsigned long flags;
347
348 device_port = port->port_number;
349
350 serial = port->serial;
351
352 port_priv = usb_get_serial_port_data(port);
353
354 /* set the port to RS232 mode */
355 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
356 QT2_QMCR_RS232, device_port);
357 if (status < 0) {
358 dev_err(&port->dev,
359 "%s failed to set RS232 mode for port %i error %i\n",
360 __func__, device_port, status);
361 return status;
362 }
363
364 data = kzalloc(2, GFP_KERNEL);
365 if (!data)
366 return -ENOMEM;
367
368 /* open the port */
369 status = usb_control_msg(serial->dev,
370 usb_rcvctrlpipe(serial->dev, 0),
371 QT_OPEN_CLOSE_CHANNEL,
372 0xc0, 0,
373 device_port, data, 2, QT2_USB_TIMEOUT);
374
375 if (status < 2) {
376 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
377 status);
378 if (status >= 0)
379 status = -EIO;
380 kfree(data);
381 return status;
382 }
383
384 spin_lock_irqsave(&port_priv->lock, flags);
385 port_priv->shadowLSR = data[0];
386 port_priv->shadowMSR = data[1];
387 spin_unlock_irqrestore(&port_priv->lock, flags);
388
389 kfree(data);
390
391 /* set to default speed and 8bit word size */
392 status = qt2_set_port_config(serial->dev, device_port,
393 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
394 if (status < 0) {
395 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
396 __func__, device_port);
397 return status;
398 }
399
400 port_priv->device_port = (u8) device_port;
401
402 if (tty)
403 qt2_set_termios(tty, port, &tty->termios);
404
405 return 0;
406
407 }
408
qt2_close(struct usb_serial_port * port)409 static void qt2_close(struct usb_serial_port *port)
410 {
411 struct usb_serial *serial;
412 struct qt2_port_private *port_priv;
413 unsigned long flags;
414 int i;
415
416 serial = port->serial;
417 port_priv = usb_get_serial_port_data(port);
418
419 spin_lock_irqsave(&port_priv->urb_lock, flags);
420 usb_kill_urb(port_priv->write_urb);
421 port_priv->urb_in_use = false;
422 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
423
424 /* flush the port transmit buffer */
425 i = usb_control_msg(serial->dev,
426 usb_rcvctrlpipe(serial->dev, 0),
427 QT2_FLUSH_DEVICE, 0x40, 1,
428 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
429
430 if (i < 0)
431 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
432 __func__, i);
433
434 /* flush the port receive buffer */
435 i = usb_control_msg(serial->dev,
436 usb_rcvctrlpipe(serial->dev, 0),
437 QT2_FLUSH_DEVICE, 0x40, 0,
438 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
439
440 if (i < 0)
441 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
442 __func__, i);
443
444 /* close the port */
445 i = usb_control_msg(serial->dev,
446 usb_sndctrlpipe(serial->dev, 0),
447 QT_OPEN_CLOSE_CHANNEL,
448 0x40, 0,
449 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
450
451 if (i < 0)
452 dev_err(&port->dev, "%s - close port failed %i\n",
453 __func__, i);
454 }
455
qt2_disconnect(struct usb_serial * serial)456 static void qt2_disconnect(struct usb_serial *serial)
457 {
458 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
459
460 usb_kill_urb(serial_priv->read_urb);
461 }
462
get_serial_info(struct usb_serial_port * port,struct serial_struct __user * retinfo)463 static int get_serial_info(struct usb_serial_port *port,
464 struct serial_struct __user *retinfo)
465 {
466 struct serial_struct tmp;
467
468 if (!retinfo)
469 return -EFAULT;
470
471 memset(&tmp, 0, sizeof(tmp));
472 tmp.line = port->minor;
473 tmp.port = 0;
474 tmp.irq = 0;
475 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
476 tmp.xmit_fifo_size = port->bulk_out_size;
477 tmp.baud_base = 9600;
478 tmp.close_delay = 5*HZ;
479 tmp.closing_wait = 30*HZ;
480
481 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
482 return -EFAULT;
483 return 0;
484 }
485
qt2_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)486 static int qt2_ioctl(struct tty_struct *tty,
487 unsigned int cmd, unsigned long arg)
488 {
489 struct usb_serial_port *port = tty->driver_data;
490
491 switch (cmd) {
492 case TIOCGSERIAL:
493 return get_serial_info(port,
494 (struct serial_struct __user *)arg);
495 default:
496 break;
497 }
498
499 return -ENOIOCTLCMD;
500 }
501
qt2_process_status(struct usb_serial_port * port,unsigned char * ch)502 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
503 {
504 switch (*ch) {
505 case QT2_LINE_STATUS:
506 qt2_update_lsr(port, ch + 1);
507 break;
508 case QT2_MODEM_STATUS:
509 qt2_update_msr(port, ch + 1);
510 break;
511 }
512 }
513
514 /* not needed, kept to document functionality */
qt2_process_xmit_empty(struct usb_serial_port * port,unsigned char * ch)515 static void qt2_process_xmit_empty(struct usb_serial_port *port,
516 unsigned char *ch)
517 {
518 int bytes_written;
519
520 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
521 }
522
523 /* not needed, kept to document functionality */
qt2_process_flush(struct usb_serial_port * port,unsigned char * ch)524 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
525 {
526 return;
527 }
528
qt2_process_read_urb(struct urb * urb)529 static void qt2_process_read_urb(struct urb *urb)
530 {
531 struct usb_serial *serial;
532 struct qt2_serial_private *serial_priv;
533 struct usb_serial_port *port;
534 struct qt2_port_private *port_priv;
535 bool escapeflag;
536 unsigned char *ch;
537 int i;
538 unsigned char newport;
539 int len = urb->actual_length;
540
541 if (!len)
542 return;
543
544 ch = urb->transfer_buffer;
545 serial = urb->context;
546 serial_priv = usb_get_serial_data(serial);
547 port = serial->port[serial_priv->current_port];
548 port_priv = usb_get_serial_port_data(port);
549
550 for (i = 0; i < urb->actual_length; i++) {
551 ch = (unsigned char *)urb->transfer_buffer + i;
552 if ((i <= (len - 3)) &&
553 (*ch == QT2_CONTROL_BYTE) &&
554 (*(ch + 1) == QT2_CONTROL_BYTE)) {
555 escapeflag = false;
556 switch (*(ch + 2)) {
557 case QT2_LINE_STATUS:
558 case QT2_MODEM_STATUS:
559 if (i > (len - 4)) {
560 dev_warn(&port->dev,
561 "%s - status message too short\n",
562 __func__);
563 break;
564 }
565 qt2_process_status(port, ch + 2);
566 i += 3;
567 escapeflag = true;
568 break;
569 case QT2_XMIT_HOLD:
570 if (i > (len - 5)) {
571 dev_warn(&port->dev,
572 "%s - xmit_empty message too short\n",
573 __func__);
574 break;
575 }
576 qt2_process_xmit_empty(port, ch + 3);
577 i += 4;
578 escapeflag = true;
579 break;
580 case QT2_CHANGE_PORT:
581 if (i > (len - 4)) {
582 dev_warn(&port->dev,
583 "%s - change_port message too short\n",
584 __func__);
585 break;
586 }
587 tty_flip_buffer_push(&port->port);
588
589 newport = *(ch + 3);
590
591 if (newport > serial->num_ports) {
592 dev_err(&port->dev,
593 "%s - port change to invalid port: %i\n",
594 __func__, newport);
595 break;
596 }
597
598 serial_priv->current_port = newport;
599 port = serial->port[serial_priv->current_port];
600 port_priv = usb_get_serial_port_data(port);
601 i += 3;
602 escapeflag = true;
603 break;
604 case QT2_REC_FLUSH:
605 case QT2_XMIT_FLUSH:
606 qt2_process_flush(port, ch + 2);
607 i += 2;
608 escapeflag = true;
609 break;
610 case QT2_CONTROL_ESCAPE:
611 tty_buffer_request_room(&port->port, 2);
612 tty_insert_flip_string(&port->port, ch, 2);
613 i += 2;
614 escapeflag = true;
615 break;
616 default:
617 dev_warn(&port->dev,
618 "%s - unsupported command %i\n",
619 __func__, *(ch + 2));
620 break;
621 }
622 if (escapeflag)
623 continue;
624 }
625
626 tty_buffer_request_room(&port->port, 1);
627 tty_insert_flip_string(&port->port, ch, 1);
628 }
629
630 tty_flip_buffer_push(&port->port);
631 }
632
qt2_write_bulk_callback(struct urb * urb)633 static void qt2_write_bulk_callback(struct urb *urb)
634 {
635 struct usb_serial_port *port;
636 struct qt2_port_private *port_priv;
637
638 port = urb->context;
639 port_priv = usb_get_serial_port_data(port);
640
641 spin_lock(&port_priv->urb_lock);
642
643 port_priv->urb_in_use = false;
644 usb_serial_port_softint(port);
645
646 spin_unlock(&port_priv->urb_lock);
647
648 }
649
qt2_read_bulk_callback(struct urb * urb)650 static void qt2_read_bulk_callback(struct urb *urb)
651 {
652 struct usb_serial *serial = urb->context;
653 int status;
654
655 if (urb->status) {
656 dev_warn(&serial->dev->dev,
657 "%s - non-zero urb status: %i\n", __func__,
658 urb->status);
659 return;
660 }
661
662 qt2_process_read_urb(urb);
663
664 status = usb_submit_urb(urb, GFP_ATOMIC);
665 if (status != 0)
666 dev_err(&serial->dev->dev,
667 "%s - resubmit read urb failed: %i\n",
668 __func__, status);
669 }
670
qt2_setup_urbs(struct usb_serial * serial)671 static int qt2_setup_urbs(struct usb_serial *serial)
672 {
673 struct usb_serial_port *port0;
674 struct qt2_serial_private *serial_priv;
675 int status;
676
677 port0 = serial->port[0];
678
679 serial_priv = usb_get_serial_data(serial);
680 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
681 if (!serial_priv->read_urb)
682 return -ENOMEM;
683
684 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
685 usb_rcvbulkpipe(serial->dev,
686 port0->bulk_in_endpointAddress),
687 serial_priv->read_buffer,
688 QT2_READ_BUFFER_SIZE,
689 qt2_read_bulk_callback, serial);
690
691 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
692 if (status != 0) {
693 dev_err(&serial->dev->dev,
694 "%s - submit read urb failed %i\n", __func__, status);
695 usb_free_urb(serial_priv->read_urb);
696 return status;
697 }
698
699 return 0;
700 }
701
qt2_attach(struct usb_serial * serial)702 static int qt2_attach(struct usb_serial *serial)
703 {
704 struct qt2_serial_private *serial_priv;
705 int status;
706
707 /* power on unit */
708 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
709 0xc2, 0x40, 0x8000, 0, NULL, 0,
710 QT2_USB_TIMEOUT);
711 if (status < 0) {
712 dev_err(&serial->dev->dev,
713 "%s - failed to power on unit: %i\n", __func__, status);
714 return status;
715 }
716
717 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
718 if (!serial_priv)
719 return -ENOMEM;
720
721 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
722 if (!serial_priv->read_buffer) {
723 status = -ENOMEM;
724 goto err_buf;
725 }
726
727 usb_set_serial_data(serial, serial_priv);
728
729 status = qt2_setup_urbs(serial);
730 if (status != 0)
731 goto attach_failed;
732
733 return 0;
734
735 attach_failed:
736 kfree(serial_priv->read_buffer);
737 err_buf:
738 kfree(serial_priv);
739 return status;
740 }
741
qt2_port_probe(struct usb_serial_port * port)742 static int qt2_port_probe(struct usb_serial_port *port)
743 {
744 struct usb_serial *serial = port->serial;
745 struct qt2_port_private *port_priv;
746 u8 bEndpointAddress;
747
748 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
749 if (!port_priv)
750 return -ENOMEM;
751
752 spin_lock_init(&port_priv->lock);
753 spin_lock_init(&port_priv->urb_lock);
754 port_priv->port = port;
755
756 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
757 if (!port_priv->write_buffer)
758 goto err_buf;
759
760 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
761 if (!port_priv->write_urb)
762 goto err_urb;
763
764 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
765 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
766 usb_sndbulkpipe(serial->dev, bEndpointAddress),
767 port_priv->write_buffer,
768 QT2_WRITE_BUFFER_SIZE,
769 qt2_write_bulk_callback, port);
770
771 usb_set_serial_port_data(port, port_priv);
772
773 return 0;
774 err_urb:
775 kfree(port_priv->write_buffer);
776 err_buf:
777 kfree(port_priv);
778 return -ENOMEM;
779 }
780
qt2_port_remove(struct usb_serial_port * port)781 static int qt2_port_remove(struct usb_serial_port *port)
782 {
783 struct qt2_port_private *port_priv;
784
785 port_priv = usb_get_serial_port_data(port);
786 usb_free_urb(port_priv->write_urb);
787 kfree(port_priv->write_buffer);
788 kfree(port_priv);
789
790 return 0;
791 }
792
qt2_tiocmget(struct tty_struct * tty)793 static int qt2_tiocmget(struct tty_struct *tty)
794 {
795 struct usb_serial_port *port = tty->driver_data;
796 struct usb_device *dev = port->serial->dev;
797 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
798 u8 *d;
799 int r;
800
801 d = kzalloc(2, GFP_KERNEL);
802 if (!d)
803 return -ENOMEM;
804
805 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
806 if (r < 0)
807 goto mget_out;
808
809 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
810 if (r < 0)
811 goto mget_out;
812
813 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
814 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
815 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
816 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
817 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
818 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
819
820 mget_out:
821 kfree(d);
822 return r;
823 }
824
qt2_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)825 static int qt2_tiocmset(struct tty_struct *tty,
826 unsigned int set, unsigned int clear)
827 {
828 struct qt2_port_private *port_priv;
829
830 port_priv = usb_get_serial_port_data(tty->driver_data);
831 return update_mctrl(port_priv, set, clear);
832 }
833
qt2_break_ctl(struct tty_struct * tty,int break_state)834 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
835 {
836 struct usb_serial_port *port = tty->driver_data;
837 struct qt2_port_private *port_priv;
838 int status;
839 u16 val;
840
841 port_priv = usb_get_serial_port_data(port);
842
843 val = (break_state == -1) ? 1 : 0;
844
845 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
846 val, port_priv->device_port);
847 if (status < 0)
848 dev_warn(&port->dev,
849 "%s - failed to send control message: %i\n", __func__,
850 status);
851 }
852
853
854
qt2_dtr_rts(struct usb_serial_port * port,int on)855 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
856 {
857 struct usb_device *dev = port->serial->dev;
858 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
859
860 /* Disable flow control */
861 if (!on) {
862 if (qt2_setregister(dev, port_priv->device_port,
863 UART_MCR, 0) < 0)
864 dev_warn(&port->dev, "error from flowcontrol urb\n");
865 }
866 /* drop RTS and DTR */
867 if (on)
868 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
869 else
870 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
871 }
872
qt2_update_msr(struct usb_serial_port * port,unsigned char * ch)873 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
874 {
875 struct qt2_port_private *port_priv;
876 u8 newMSR = (u8) *ch;
877 unsigned long flags;
878
879 port_priv = usb_get_serial_port_data(port);
880
881 spin_lock_irqsave(&port_priv->lock, flags);
882 port_priv->shadowMSR = newMSR;
883 spin_unlock_irqrestore(&port_priv->lock, flags);
884
885 if (newMSR & UART_MSR_ANY_DELTA) {
886 /* update input line counters */
887 if (newMSR & UART_MSR_DCTS)
888 port->icount.cts++;
889 if (newMSR & UART_MSR_DDSR)
890 port->icount.dsr++;
891 if (newMSR & UART_MSR_DDCD)
892 port->icount.dcd++;
893 if (newMSR & UART_MSR_TERI)
894 port->icount.rng++;
895
896 wake_up_interruptible(&port->port.delta_msr_wait);
897 }
898 }
899
qt2_update_lsr(struct usb_serial_port * port,unsigned char * ch)900 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
901 {
902 struct qt2_port_private *port_priv;
903 struct async_icount *icount;
904 unsigned long flags;
905 u8 newLSR = (u8) *ch;
906
907 port_priv = usb_get_serial_port_data(port);
908
909 if (newLSR & UART_LSR_BI)
910 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
911
912 spin_lock_irqsave(&port_priv->lock, flags);
913 port_priv->shadowLSR = newLSR;
914 spin_unlock_irqrestore(&port_priv->lock, flags);
915
916 icount = &port->icount;
917
918 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
919
920 if (newLSR & UART_LSR_BI)
921 icount->brk++;
922
923 if (newLSR & UART_LSR_OE)
924 icount->overrun++;
925
926 if (newLSR & UART_LSR_PE)
927 icount->parity++;
928
929 if (newLSR & UART_LSR_FE)
930 icount->frame++;
931 }
932
933 }
934
qt2_write_room(struct tty_struct * tty)935 static int qt2_write_room(struct tty_struct *tty)
936 {
937 struct usb_serial_port *port = tty->driver_data;
938 struct qt2_port_private *port_priv;
939 unsigned long flags = 0;
940 int r;
941
942 port_priv = usb_get_serial_port_data(port);
943
944 spin_lock_irqsave(&port_priv->urb_lock, flags);
945
946 if (port_priv->urb_in_use)
947 r = 0;
948 else
949 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
950
951 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
952
953 return r;
954 }
955
qt2_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)956 static int qt2_write(struct tty_struct *tty,
957 struct usb_serial_port *port,
958 const unsigned char *buf, int count)
959 {
960 struct qt2_port_private *port_priv;
961 struct urb *write_urb;
962 unsigned char *data;
963 unsigned long flags;
964 int status;
965 int bytes_out = 0;
966
967 port_priv = usb_get_serial_port_data(port);
968
969 if (port_priv->write_urb == NULL) {
970 dev_err(&port->dev, "%s - no output urb\n", __func__);
971 return 0;
972 }
973 write_urb = port_priv->write_urb;
974
975 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
976
977 data = write_urb->transfer_buffer;
978 spin_lock_irqsave(&port_priv->urb_lock, flags);
979 if (port_priv->urb_in_use == true) {
980 dev_err(&port->dev, "qt2_write - urb is in use\n");
981 goto write_out;
982 }
983
984 *data++ = QT2_CONTROL_BYTE;
985 *data++ = QT2_CONTROL_BYTE;
986 *data++ = port_priv->device_port;
987 put_unaligned_le16(count, data);
988 data += 2;
989 memcpy(data, buf, count);
990
991 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
992
993 status = usb_submit_urb(write_urb, GFP_ATOMIC);
994 if (status == 0) {
995 port_priv->urb_in_use = true;
996 bytes_out += count;
997 }
998
999 write_out:
1000 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1001 return bytes_out;
1002 }
1003
1004
1005 static struct usb_serial_driver qt2_device = {
1006 .driver = {
1007 .owner = THIS_MODULE,
1008 .name = "quatech-serial",
1009 },
1010 .description = DRIVER_DESC,
1011 .id_table = id_table,
1012 .open = qt2_open,
1013 .close = qt2_close,
1014 .write = qt2_write,
1015 .write_room = qt2_write_room,
1016 .calc_num_ports = qt2_calc_num_ports,
1017 .attach = qt2_attach,
1018 .release = qt2_release,
1019 .disconnect = qt2_disconnect,
1020 .port_probe = qt2_port_probe,
1021 .port_remove = qt2_port_remove,
1022 .dtr_rts = qt2_dtr_rts,
1023 .break_ctl = qt2_break_ctl,
1024 .tiocmget = qt2_tiocmget,
1025 .tiocmset = qt2_tiocmset,
1026 .tiocmiwait = usb_serial_generic_tiocmiwait,
1027 .get_icount = usb_serial_generic_get_icount,
1028 .ioctl = qt2_ioctl,
1029 .set_termios = qt2_set_termios,
1030 };
1031
1032 static struct usb_serial_driver *const serial_drivers[] = {
1033 &qt2_device, NULL
1034 };
1035
1036 module_usb_serial_driver(serial_drivers, id_table);
1037
1038 MODULE_DESCRIPTION(DRIVER_DESC);
1039 MODULE_LICENSE("GPL");
1040