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Merge tag 'for-f2fs-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk...
[mirror_ubuntu-artful-kernel.git] / drivers / usb / serial / quatech2.c
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
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
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
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
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
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
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
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
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
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
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
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
409 static void qt2_close(struct usb_serial_port *port)
410 {
411 struct usb_serial *serial;
412 struct qt2_port_private *port_priv;
413 int i;
414
415 serial = port->serial;
416 port_priv = usb_get_serial_port_data(port);
417
418 usb_kill_urb(port_priv->write_urb);
419
420 /* flush the port transmit buffer */
421 i = usb_control_msg(serial->dev,
422 usb_rcvctrlpipe(serial->dev, 0),
423 QT2_FLUSH_DEVICE, 0x40, 1,
424 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
425
426 if (i < 0)
427 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
428 __func__, i);
429
430 /* flush the port receive buffer */
431 i = usb_control_msg(serial->dev,
432 usb_rcvctrlpipe(serial->dev, 0),
433 QT2_FLUSH_DEVICE, 0x40, 0,
434 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
435
436 if (i < 0)
437 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
438 __func__, i);
439
440 /* close the port */
441 i = usb_control_msg(serial->dev,
442 usb_sndctrlpipe(serial->dev, 0),
443 QT_OPEN_CLOSE_CHANNEL,
444 0x40, 0,
445 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
446
447 if (i < 0)
448 dev_err(&port->dev, "%s - close port failed %i\n",
449 __func__, i);
450 }
451
452 static void qt2_disconnect(struct usb_serial *serial)
453 {
454 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
455
456 usb_kill_urb(serial_priv->read_urb);
457 }
458
459 static int get_serial_info(struct usb_serial_port *port,
460 struct serial_struct __user *retinfo)
461 {
462 struct serial_struct tmp;
463
464 memset(&tmp, 0, sizeof(tmp));
465 tmp.line = port->minor;
466 tmp.port = 0;
467 tmp.irq = 0;
468 tmp.xmit_fifo_size = port->bulk_out_size;
469 tmp.baud_base = 9600;
470 tmp.close_delay = 5*HZ;
471 tmp.closing_wait = 30*HZ;
472
473 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
474 return -EFAULT;
475 return 0;
476 }
477
478 static int qt2_ioctl(struct tty_struct *tty,
479 unsigned int cmd, unsigned long arg)
480 {
481 struct usb_serial_port *port = tty->driver_data;
482
483 switch (cmd) {
484 case TIOCGSERIAL:
485 return get_serial_info(port,
486 (struct serial_struct __user *)arg);
487 default:
488 break;
489 }
490
491 return -ENOIOCTLCMD;
492 }
493
494 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
495 {
496 switch (*ch) {
497 case QT2_LINE_STATUS:
498 qt2_update_lsr(port, ch + 1);
499 break;
500 case QT2_MODEM_STATUS:
501 qt2_update_msr(port, ch + 1);
502 break;
503 }
504 }
505
506 /* not needed, kept to document functionality */
507 static void qt2_process_xmit_empty(struct usb_serial_port *port,
508 unsigned char *ch)
509 {
510 int bytes_written;
511
512 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
513 }
514
515 /* not needed, kept to document functionality */
516 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
517 {
518 return;
519 }
520
521 static void qt2_process_read_urb(struct urb *urb)
522 {
523 struct usb_serial *serial;
524 struct qt2_serial_private *serial_priv;
525 struct usb_serial_port *port;
526 struct qt2_port_private *port_priv;
527 bool escapeflag;
528 unsigned char *ch;
529 int i;
530 unsigned char newport;
531 int len = urb->actual_length;
532
533 if (!len)
534 return;
535
536 ch = urb->transfer_buffer;
537 serial = urb->context;
538 serial_priv = usb_get_serial_data(serial);
539 port = serial->port[serial_priv->current_port];
540 port_priv = usb_get_serial_port_data(port);
541
542 for (i = 0; i < urb->actual_length; i++) {
543 ch = (unsigned char *)urb->transfer_buffer + i;
544 if ((i <= (len - 3)) &&
545 (*ch == QT2_CONTROL_BYTE) &&
546 (*(ch + 1) == QT2_CONTROL_BYTE)) {
547 escapeflag = false;
548 switch (*(ch + 2)) {
549 case QT2_LINE_STATUS:
550 case QT2_MODEM_STATUS:
551 if (i > (len - 4)) {
552 dev_warn(&port->dev,
553 "%s - status message too short\n",
554 __func__);
555 break;
556 }
557 qt2_process_status(port, ch + 2);
558 i += 3;
559 escapeflag = true;
560 break;
561 case QT2_XMIT_HOLD:
562 if (i > (len - 5)) {
563 dev_warn(&port->dev,
564 "%s - xmit_empty message too short\n",
565 __func__);
566 break;
567 }
568 qt2_process_xmit_empty(port, ch + 3);
569 i += 4;
570 escapeflag = true;
571 break;
572 case QT2_CHANGE_PORT:
573 if (i > (len - 4)) {
574 dev_warn(&port->dev,
575 "%s - change_port message too short\n",
576 __func__);
577 break;
578 }
579 tty_flip_buffer_push(&port->port);
580
581 newport = *(ch + 3);
582
583 if (newport > serial->num_ports) {
584 dev_err(&port->dev,
585 "%s - port change to invalid port: %i\n",
586 __func__, newport);
587 break;
588 }
589
590 serial_priv->current_port = newport;
591 port = serial->port[serial_priv->current_port];
592 port_priv = usb_get_serial_port_data(port);
593 i += 3;
594 escapeflag = true;
595 break;
596 case QT2_REC_FLUSH:
597 case QT2_XMIT_FLUSH:
598 qt2_process_flush(port, ch + 2);
599 i += 2;
600 escapeflag = true;
601 break;
602 case QT2_CONTROL_ESCAPE:
603 tty_buffer_request_room(&port->port, 2);
604 tty_insert_flip_string(&port->port, ch, 2);
605 i += 2;
606 escapeflag = true;
607 break;
608 default:
609 dev_warn(&port->dev,
610 "%s - unsupported command %i\n",
611 __func__, *(ch + 2));
612 break;
613 }
614 if (escapeflag)
615 continue;
616 }
617
618 tty_buffer_request_room(&port->port, 1);
619 tty_insert_flip_string(&port->port, ch, 1);
620 }
621
622 tty_flip_buffer_push(&port->port);
623 }
624
625 static void qt2_write_bulk_callback(struct urb *urb)
626 {
627 struct usb_serial_port *port;
628 struct qt2_port_private *port_priv;
629
630 port = urb->context;
631 port_priv = usb_get_serial_port_data(port);
632
633 spin_lock(&port_priv->urb_lock);
634
635 port_priv->urb_in_use = false;
636 usb_serial_port_softint(port);
637
638 spin_unlock(&port_priv->urb_lock);
639
640 }
641
642 static void qt2_read_bulk_callback(struct urb *urb)
643 {
644 struct usb_serial *serial = urb->context;
645 int status;
646
647 if (urb->status) {
648 dev_warn(&serial->dev->dev,
649 "%s - non-zero urb status: %i\n", __func__,
650 urb->status);
651 return;
652 }
653
654 qt2_process_read_urb(urb);
655
656 status = usb_submit_urb(urb, GFP_ATOMIC);
657 if (status != 0)
658 dev_err(&serial->dev->dev,
659 "%s - resubmit read urb failed: %i\n",
660 __func__, status);
661 }
662
663 static int qt2_setup_urbs(struct usb_serial *serial)
664 {
665 struct usb_serial_port *port0;
666 struct qt2_serial_private *serial_priv;
667 int status;
668
669 port0 = serial->port[0];
670
671 serial_priv = usb_get_serial_data(serial);
672 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
673 if (!serial_priv->read_urb)
674 return -ENOMEM;
675
676 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
677 usb_rcvbulkpipe(serial->dev,
678 port0->bulk_in_endpointAddress),
679 serial_priv->read_buffer,
680 QT2_READ_BUFFER_SIZE,
681 qt2_read_bulk_callback, serial);
682
683 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
684 if (status != 0) {
685 dev_err(&serial->dev->dev,
686 "%s - submit read urb failed %i\n", __func__, status);
687 usb_free_urb(serial_priv->read_urb);
688 return status;
689 }
690
691 return 0;
692 }
693
694 static int qt2_attach(struct usb_serial *serial)
695 {
696 struct qt2_serial_private *serial_priv;
697 int status;
698
699 /* power on unit */
700 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
701 0xc2, 0x40, 0x8000, 0, NULL, 0,
702 QT2_USB_TIMEOUT);
703 if (status < 0) {
704 dev_err(&serial->dev->dev,
705 "%s - failed to power on unit: %i\n", __func__, status);
706 return status;
707 }
708
709 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
710 if (!serial_priv)
711 return -ENOMEM;
712
713 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
714 if (!serial_priv->read_buffer) {
715 status = -ENOMEM;
716 goto err_buf;
717 }
718
719 usb_set_serial_data(serial, serial_priv);
720
721 status = qt2_setup_urbs(serial);
722 if (status != 0)
723 goto attach_failed;
724
725 return 0;
726
727 attach_failed:
728 kfree(serial_priv->read_buffer);
729 err_buf:
730 kfree(serial_priv);
731 return status;
732 }
733
734 static int qt2_port_probe(struct usb_serial_port *port)
735 {
736 struct usb_serial *serial = port->serial;
737 struct qt2_port_private *port_priv;
738 u8 bEndpointAddress;
739
740 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
741 if (!port_priv)
742 return -ENOMEM;
743
744 spin_lock_init(&port_priv->lock);
745 spin_lock_init(&port_priv->urb_lock);
746 port_priv->port = port;
747
748 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
749 if (!port_priv->write_buffer)
750 goto err_buf;
751
752 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
753 if (!port_priv->write_urb)
754 goto err_urb;
755
756 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
757 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
758 usb_sndbulkpipe(serial->dev, bEndpointAddress),
759 port_priv->write_buffer,
760 QT2_WRITE_BUFFER_SIZE,
761 qt2_write_bulk_callback, port);
762
763 usb_set_serial_port_data(port, port_priv);
764
765 return 0;
766 err_urb:
767 kfree(port_priv->write_buffer);
768 err_buf:
769 kfree(port_priv);
770 return -ENOMEM;
771 }
772
773 static int qt2_port_remove(struct usb_serial_port *port)
774 {
775 struct qt2_port_private *port_priv;
776
777 port_priv = usb_get_serial_port_data(port);
778 usb_free_urb(port_priv->write_urb);
779 kfree(port_priv->write_buffer);
780 kfree(port_priv);
781
782 return 0;
783 }
784
785 static int qt2_tiocmget(struct tty_struct *tty)
786 {
787 struct usb_serial_port *port = tty->driver_data;
788 struct usb_device *dev = port->serial->dev;
789 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
790 u8 *d;
791 int r;
792
793 d = kzalloc(2, GFP_KERNEL);
794 if (!d)
795 return -ENOMEM;
796
797 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
798 if (r < 0)
799 goto mget_out;
800
801 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
802 if (r < 0)
803 goto mget_out;
804
805 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
806 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
807 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
808 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
809 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
810 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
811
812 mget_out:
813 kfree(d);
814 return r;
815 }
816
817 static int qt2_tiocmset(struct tty_struct *tty,
818 unsigned int set, unsigned int clear)
819 {
820 struct qt2_port_private *port_priv;
821
822 port_priv = usb_get_serial_port_data(tty->driver_data);
823 return update_mctrl(port_priv, set, clear);
824 }
825
826 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
827 {
828 struct usb_serial_port *port = tty->driver_data;
829 struct qt2_port_private *port_priv;
830 int status;
831 u16 val;
832
833 port_priv = usb_get_serial_port_data(port);
834
835 val = (break_state == -1) ? 1 : 0;
836
837 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
838 val, port_priv->device_port);
839 if (status < 0)
840 dev_warn(&port->dev,
841 "%s - failed to send control message: %i\n", __func__,
842 status);
843 }
844
845
846
847 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
848 {
849 struct usb_device *dev = port->serial->dev;
850 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
851
852 /* Disable flow control */
853 if (!on) {
854 if (qt2_setregister(dev, port_priv->device_port,
855 UART_MCR, 0) < 0)
856 dev_warn(&port->dev, "error from flowcontrol urb\n");
857 }
858 /* drop RTS and DTR */
859 if (on)
860 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
861 else
862 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
863 }
864
865 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
866 {
867 struct qt2_port_private *port_priv;
868 u8 newMSR = (u8) *ch;
869 unsigned long flags;
870
871 port_priv = usb_get_serial_port_data(port);
872
873 spin_lock_irqsave(&port_priv->lock, flags);
874 port_priv->shadowMSR = newMSR;
875 spin_unlock_irqrestore(&port_priv->lock, flags);
876
877 if (newMSR & UART_MSR_ANY_DELTA) {
878 /* update input line counters */
879 if (newMSR & UART_MSR_DCTS)
880 port->icount.cts++;
881 if (newMSR & UART_MSR_DDSR)
882 port->icount.dsr++;
883 if (newMSR & UART_MSR_DDCD)
884 port->icount.dcd++;
885 if (newMSR & UART_MSR_TERI)
886 port->icount.rng++;
887
888 wake_up_interruptible(&port->port.delta_msr_wait);
889 }
890 }
891
892 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
893 {
894 struct qt2_port_private *port_priv;
895 struct async_icount *icount;
896 unsigned long flags;
897 u8 newLSR = (u8) *ch;
898
899 port_priv = usb_get_serial_port_data(port);
900
901 if (newLSR & UART_LSR_BI)
902 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
903
904 spin_lock_irqsave(&port_priv->lock, flags);
905 port_priv->shadowLSR = newLSR;
906 spin_unlock_irqrestore(&port_priv->lock, flags);
907
908 icount = &port->icount;
909
910 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
911
912 if (newLSR & UART_LSR_BI)
913 icount->brk++;
914
915 if (newLSR & UART_LSR_OE)
916 icount->overrun++;
917
918 if (newLSR & UART_LSR_PE)
919 icount->parity++;
920
921 if (newLSR & UART_LSR_FE)
922 icount->frame++;
923 }
924
925 }
926
927 static int qt2_write_room(struct tty_struct *tty)
928 {
929 struct usb_serial_port *port = tty->driver_data;
930 struct qt2_port_private *port_priv;
931 unsigned long flags = 0;
932 int r;
933
934 port_priv = usb_get_serial_port_data(port);
935
936 spin_lock_irqsave(&port_priv->urb_lock, flags);
937
938 if (port_priv->urb_in_use)
939 r = 0;
940 else
941 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
942
943 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
944
945 return r;
946 }
947
948 static int qt2_write(struct tty_struct *tty,
949 struct usb_serial_port *port,
950 const unsigned char *buf, int count)
951 {
952 struct qt2_port_private *port_priv;
953 struct urb *write_urb;
954 unsigned char *data;
955 unsigned long flags;
956 int status;
957 int bytes_out = 0;
958
959 port_priv = usb_get_serial_port_data(port);
960
961 if (port_priv->write_urb == NULL) {
962 dev_err(&port->dev, "%s - no output urb\n", __func__);
963 return 0;
964 }
965 write_urb = port_priv->write_urb;
966
967 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
968
969 data = write_urb->transfer_buffer;
970 spin_lock_irqsave(&port_priv->urb_lock, flags);
971 if (port_priv->urb_in_use) {
972 dev_err(&port->dev, "qt2_write - urb is in use\n");
973 goto write_out;
974 }
975
976 *data++ = QT2_CONTROL_BYTE;
977 *data++ = QT2_CONTROL_BYTE;
978 *data++ = port_priv->device_port;
979 put_unaligned_le16(count, data);
980 data += 2;
981 memcpy(data, buf, count);
982
983 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
984
985 status = usb_submit_urb(write_urb, GFP_ATOMIC);
986 if (status == 0) {
987 port_priv->urb_in_use = true;
988 bytes_out += count;
989 }
990
991 write_out:
992 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
993 return bytes_out;
994 }
995
996
997 static struct usb_serial_driver qt2_device = {
998 .driver = {
999 .owner = THIS_MODULE,
1000 .name = "quatech-serial",
1001 },
1002 .description = DRIVER_DESC,
1003 .id_table = id_table,
1004 .open = qt2_open,
1005 .close = qt2_close,
1006 .write = qt2_write,
1007 .write_room = qt2_write_room,
1008 .calc_num_ports = qt2_calc_num_ports,
1009 .attach = qt2_attach,
1010 .release = qt2_release,
1011 .disconnect = qt2_disconnect,
1012 .port_probe = qt2_port_probe,
1013 .port_remove = qt2_port_remove,
1014 .dtr_rts = qt2_dtr_rts,
1015 .break_ctl = qt2_break_ctl,
1016 .tiocmget = qt2_tiocmget,
1017 .tiocmset = qt2_tiocmset,
1018 .tiocmiwait = usb_serial_generic_tiocmiwait,
1019 .get_icount = usb_serial_generic_get_icount,
1020 .ioctl = qt2_ioctl,
1021 .set_termios = qt2_set_termios,
1022 };
1023
1024 static struct usb_serial_driver *const serial_drivers[] = {
1025 &qt2_device, NULL
1026 };
1027
1028 module_usb_serial_driver(serial_drivers, id_table);
1029
1030 MODULE_DESCRIPTION(DRIVER_DESC);
1031 MODULE_LICENSE("GPL");
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