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pty: Repair TIOCGPTPEER
[cris-mirror.git] / drivers / usb / serial / quatech2.c
blob60e17d1444c39fc50f4fbd85a579e967ba823775
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 struct usb_serial_endpoints *epds)
251 {
252 struct qt2_device_detail d;
253 int i;
254
255 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
256 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
257 return d.num_ports;
258 }
259
260 /* we didn't recognize the device */
261 dev_err(&serial->dev->dev,
262 "don't know the number of ports, assuming 1\n");
263
264 return 1;
265 }
266
267 static void qt2_set_termios(struct tty_struct *tty,
268 struct usb_serial_port *port,
269 struct ktermios *old_termios)
270 {
271 struct usb_device *dev = port->serial->dev;
272 struct qt2_port_private *port_priv;
273 struct ktermios *termios = &tty->termios;
274 u16 baud;
275 unsigned int cflag = termios->c_cflag;
276 u16 new_lcr = 0;
277 int status;
278
279 port_priv = usb_get_serial_port_data(port);
280
281 if (cflag & PARENB) {
282 if (cflag & PARODD)
283 new_lcr |= UART_LCR_PARITY;
284 else
285 new_lcr |= SERIAL_EVEN_PARITY;
286 }
287
288 switch (cflag & CSIZE) {
289 case CS5:
290 new_lcr |= UART_LCR_WLEN5;
291 break;
292 case CS6:
293 new_lcr |= UART_LCR_WLEN6;
294 break;
295 case CS7:
296 new_lcr |= UART_LCR_WLEN7;
297 break;
298 default:
299 case CS8:
300 new_lcr |= UART_LCR_WLEN8;
301 break;
302 }
303
304 baud = tty_get_baud_rate(tty);
305 if (!baud)
306 baud = 9600;
307
308 status = qt2_set_port_config(dev, port_priv->device_port, baud,
309 new_lcr);
310 if (status < 0)
311 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
312 __func__, status);
313
314 if (cflag & CRTSCTS)
315 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
316 SERIAL_CRTSCTS,
317 port_priv->device_port);
318 else
319 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
320 0, port_priv->device_port);
321 if (status < 0)
322 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
323 __func__, status);
324
325 if (I_IXOFF(tty) || I_IXON(tty)) {
326 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
327
328 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
329 x, port_priv->device_port);
330 } else
331 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
332 0, port_priv->device_port);
333
334 if (status < 0)
335 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
336 __func__, status);
337
338 }
339
340 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
341 {
342 struct usb_serial *serial;
343 struct qt2_port_private *port_priv;
344 u8 *data;
345 u16 device_port;
346 int status;
347 unsigned long flags;
348
349 device_port = port->port_number;
350
351 serial = port->serial;
352
353 port_priv = usb_get_serial_port_data(port);
354
355 /* set the port to RS232 mode */
356 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
357 QT2_QMCR_RS232, device_port);
358 if (status < 0) {
359 dev_err(&port->dev,
360 "%s failed to set RS232 mode for port %i error %i\n",
361 __func__, device_port, status);
362 return status;
363 }
364
365 data = kzalloc(2, GFP_KERNEL);
366 if (!data)
367 return -ENOMEM;
368
369 /* open the port */
370 status = usb_control_msg(serial->dev,
371 usb_rcvctrlpipe(serial->dev, 0),
372 QT_OPEN_CLOSE_CHANNEL,
373 0xc0, 0,
374 device_port, data, 2, QT2_USB_TIMEOUT);
375
376 if (status < 2) {
377 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
378 status);
379 if (status >= 0)
380 status = -EIO;
381 kfree(data);
382 return status;
383 }
384
385 spin_lock_irqsave(&port_priv->lock, flags);
386 port_priv->shadowLSR = data[0];
387 port_priv->shadowMSR = data[1];
388 spin_unlock_irqrestore(&port_priv->lock, flags);
389
390 kfree(data);
391
392 /* set to default speed and 8bit word size */
393 status = qt2_set_port_config(serial->dev, device_port,
394 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
395 if (status < 0) {
396 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
397 __func__, device_port);
398 return status;
399 }
400
401 port_priv->device_port = (u8) device_port;
402
403 if (tty)
404 qt2_set_termios(tty, port, &tty->termios);
405
406 return 0;
407
408 }
409
410 static void qt2_close(struct usb_serial_port *port)
411 {
412 struct usb_serial *serial;
413 struct qt2_port_private *port_priv;
414 int i;
415
416 serial = port->serial;
417 port_priv = usb_get_serial_port_data(port);
418
419 usb_kill_urb(port_priv->write_urb);
420
421 /* flush the port transmit buffer */
422 i = usb_control_msg(serial->dev,
423 usb_rcvctrlpipe(serial->dev, 0),
424 QT2_FLUSH_DEVICE, 0x40, 1,
425 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
426
427 if (i < 0)
428 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
429 __func__, i);
430
431 /* flush the port receive buffer */
432 i = usb_control_msg(serial->dev,
433 usb_rcvctrlpipe(serial->dev, 0),
434 QT2_FLUSH_DEVICE, 0x40, 0,
435 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
436
437 if (i < 0)
438 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
439 __func__, i);
440
441 /* close the port */
442 i = usb_control_msg(serial->dev,
443 usb_sndctrlpipe(serial->dev, 0),
444 QT_OPEN_CLOSE_CHANNEL,
445 0x40, 0,
446 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
447
448 if (i < 0)
449 dev_err(&port->dev, "%s - close port failed %i\n",
450 __func__, i);
451 }
452
453 static void qt2_disconnect(struct usb_serial *serial)
454 {
455 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
456
457 usb_kill_urb(serial_priv->read_urb);
458 }
459
460 static int get_serial_info(struct usb_serial_port *port,
461 struct serial_struct __user *retinfo)
462 {
463 struct serial_struct tmp;
464
465 memset(&tmp, 0, sizeof(tmp));
466 tmp.line = port->minor;
467 tmp.port = 0;
468 tmp.irq = 0;
469 tmp.xmit_fifo_size = port->bulk_out_size;
470 tmp.baud_base = 9600;
471 tmp.close_delay = 5*HZ;
472 tmp.closing_wait = 30*HZ;
473
474 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
475 return -EFAULT;
476 return 0;
477 }
478
479 static int qt2_ioctl(struct tty_struct *tty,
480 unsigned int cmd, unsigned long arg)
481 {
482 struct usb_serial_port *port = tty->driver_data;
483
484 switch (cmd) {
485 case TIOCGSERIAL:
486 return get_serial_info(port,
487 (struct serial_struct __user *)arg);
488 default:
489 break;
490 }
491
492 return -ENOIOCTLCMD;
493 }
494
495 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
496 {
497 switch (*ch) {
498 case QT2_LINE_STATUS:
499 qt2_update_lsr(port, ch + 1);
500 break;
501 case QT2_MODEM_STATUS:
502 qt2_update_msr(port, ch + 1);
503 break;
504 }
505 }
506
507 /* not needed, kept to document functionality */
508 static void qt2_process_xmit_empty(struct usb_serial_port *port,
509 unsigned char *ch)
510 {
511 int bytes_written;
512
513 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
514 }
515
516 /* not needed, kept to document functionality */
517 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
518 {
519 return;
520 }
521
522 static void qt2_process_read_urb(struct urb *urb)
523 {
524 struct usb_serial *serial;
525 struct qt2_serial_private *serial_priv;
526 struct usb_serial_port *port;
527 struct qt2_port_private *port_priv;
528 bool escapeflag;
529 unsigned char *ch;
530 int i;
531 unsigned char newport;
532 int len = urb->actual_length;
533
534 if (!len)
535 return;
536
537 ch = urb->transfer_buffer;
538 serial = urb->context;
539 serial_priv = usb_get_serial_data(serial);
540 port = serial->port[serial_priv->current_port];
541 port_priv = usb_get_serial_port_data(port);
542
543 for (i = 0; i < urb->actual_length; i++) {
544 ch = (unsigned char *)urb->transfer_buffer + i;
545 if ((i <= (len - 3)) &&
546 (*ch == QT2_CONTROL_BYTE) &&
547 (*(ch + 1) == QT2_CONTROL_BYTE)) {
548 escapeflag = false;
549 switch (*(ch + 2)) {
550 case QT2_LINE_STATUS:
551 case QT2_MODEM_STATUS:
552 if (i > (len - 4)) {
553 dev_warn(&port->dev,
554 "%s - status message too short\n",
555 __func__);
556 break;
557 }
558 qt2_process_status(port, ch + 2);
559 i += 3;
560 escapeflag = true;
561 break;
562 case QT2_XMIT_HOLD:
563 if (i > (len - 5)) {
564 dev_warn(&port->dev,
565 "%s - xmit_empty message too short\n",
566 __func__);
567 break;
568 }
569 qt2_process_xmit_empty(port, ch + 3);
570 i += 4;
571 escapeflag = true;
572 break;
573 case QT2_CHANGE_PORT:
574 if (i > (len - 4)) {
575 dev_warn(&port->dev,
576 "%s - change_port message too short\n",
577 __func__);
578 break;
579 }
580 tty_flip_buffer_push(&port->port);
581
582 newport = *(ch + 3);
583
584 if (newport > serial->num_ports) {
585 dev_err(&port->dev,
586 "%s - port change to invalid port: %i\n",
587 __func__, newport);
588 break;
589 }
590
591 serial_priv->current_port = newport;
592 port = serial->port[serial_priv->current_port];
593 port_priv = usb_get_serial_port_data(port);
594 i += 3;
595 escapeflag = true;
596 break;
597 case QT2_REC_FLUSH:
598 case QT2_XMIT_FLUSH:
599 qt2_process_flush(port, ch + 2);
600 i += 2;
601 escapeflag = true;
602 break;
603 case QT2_CONTROL_ESCAPE:
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_insert_flip_char(&port->port, *ch, TTY_NORMAL);
619 }
620
621 tty_flip_buffer_push(&port->port);
622 }
623
624 static void qt2_write_bulk_callback(struct urb *urb)
625 {
626 struct usb_serial_port *port;
627 struct qt2_port_private *port_priv;
628
629 port = urb->context;
630 port_priv = usb_get_serial_port_data(port);
631
632 spin_lock(&port_priv->urb_lock);
633
634 port_priv->urb_in_use = false;
635 usb_serial_port_softint(port);
636
637 spin_unlock(&port_priv->urb_lock);
638
639 }
640
641 static void qt2_read_bulk_callback(struct urb *urb)
642 {
643 struct usb_serial *serial = urb->context;
644 int status;
645
646 if (urb->status) {
647 dev_warn(&serial->dev->dev,
648 "%s - non-zero urb status: %i\n", __func__,
649 urb->status);
650 return;
651 }
652
653 qt2_process_read_urb(urb);
654
655 status = usb_submit_urb(urb, GFP_ATOMIC);
656 if (status != 0)
657 dev_err(&serial->dev->dev,
658 "%s - resubmit read urb failed: %i\n",
659 __func__, status);
660 }
661
662 static int qt2_setup_urbs(struct usb_serial *serial)
663 {
664 struct usb_serial_port *port0;
665 struct qt2_serial_private *serial_priv;
666 int status;
667
668 port0 = serial->port[0];
669
670 serial_priv = usb_get_serial_data(serial);
671 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
672 if (!serial_priv->read_urb)
673 return -ENOMEM;
674
675 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
676 usb_rcvbulkpipe(serial->dev,
677 port0->bulk_in_endpointAddress),
678 serial_priv->read_buffer,
679 QT2_READ_BUFFER_SIZE,
680 qt2_read_bulk_callback, serial);
681
682 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
683 if (status != 0) {
684 dev_err(&serial->dev->dev,
685 "%s - submit read urb failed %i\n", __func__, status);
686 usb_free_urb(serial_priv->read_urb);
687 return status;
688 }
689
690 return 0;
691 }
692
693 static int qt2_attach(struct usb_serial *serial)
694 {
695 struct qt2_serial_private *serial_priv;
696 int status;
697
698 /* power on unit */
699 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
700 0xc2, 0x40, 0x8000, 0, NULL, 0,
701 QT2_USB_TIMEOUT);
702 if (status < 0) {
703 dev_err(&serial->dev->dev,
704 "%s - failed to power on unit: %i\n", __func__, status);
705 return status;
706 }
707
708 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
709 if (!serial_priv)
710 return -ENOMEM;
711
712 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
713 if (!serial_priv->read_buffer) {
714 status = -ENOMEM;
715 goto err_buf;
716 }
717
718 usb_set_serial_data(serial, serial_priv);
719
720 status = qt2_setup_urbs(serial);
721 if (status != 0)
722 goto attach_failed;
723
724 return 0;
725
726 attach_failed:
727 kfree(serial_priv->read_buffer);
728 err_buf:
729 kfree(serial_priv);
730 return status;
731 }
732
733 static int qt2_port_probe(struct usb_serial_port *port)
734 {
735 struct usb_serial *serial = port->serial;
736 struct qt2_port_private *port_priv;
737 u8 bEndpointAddress;
738
739 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
740 if (!port_priv)
741 return -ENOMEM;
742
743 spin_lock_init(&port_priv->lock);
744 spin_lock_init(&port_priv->urb_lock);
745 port_priv->port = port;
746
747 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
748 if (!port_priv->write_buffer)
749 goto err_buf;
750
751 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
752 if (!port_priv->write_urb)
753 goto err_urb;
754
755 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
756 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
757 usb_sndbulkpipe(serial->dev, bEndpointAddress),
758 port_priv->write_buffer,
759 QT2_WRITE_BUFFER_SIZE,
760 qt2_write_bulk_callback, port);
761
762 usb_set_serial_port_data(port, port_priv);
763
764 return 0;
765 err_urb:
766 kfree(port_priv->write_buffer);
767 err_buf:
768 kfree(port_priv);
769 return -ENOMEM;
770 }
771
772 static int qt2_port_remove(struct usb_serial_port *port)
773 {
774 struct qt2_port_private *port_priv;
775
776 port_priv = usb_get_serial_port_data(port);
777 usb_free_urb(port_priv->write_urb);
778 kfree(port_priv->write_buffer);
779 kfree(port_priv);
780
781 return 0;
782 }
783
784 static int qt2_tiocmget(struct tty_struct *tty)
785 {
786 struct usb_serial_port *port = tty->driver_data;
787 struct usb_device *dev = port->serial->dev;
788 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
789 u8 *d;
790 int r;
791
792 d = kzalloc(2, GFP_KERNEL);
793 if (!d)
794 return -ENOMEM;
795
796 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
797 if (r < 0)
798 goto mget_out;
799
800 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
801 if (r < 0)
802 goto mget_out;
803
804 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
805 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
806 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
807 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
808 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
809 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
810
811 mget_out:
812 kfree(d);
813 return r;
814 }
815
816 static int qt2_tiocmset(struct tty_struct *tty,
817 unsigned int set, unsigned int clear)
818 {
819 struct qt2_port_private *port_priv;
820
821 port_priv = usb_get_serial_port_data(tty->driver_data);
822 return update_mctrl(port_priv, set, clear);
823 }
824
825 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
826 {
827 struct usb_serial_port *port = tty->driver_data;
828 struct qt2_port_private *port_priv;
829 int status;
830 u16 val;
831
832 port_priv = usb_get_serial_port_data(port);
833
834 val = (break_state == -1) ? 1 : 0;
835
836 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
837 val, port_priv->device_port);
838 if (status < 0)
839 dev_warn(&port->dev,
840 "%s - failed to send control message: %i\n", __func__,
841 status);
842 }
843
844
845
846 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
847 {
848 struct usb_device *dev = port->serial->dev;
849 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
850
851 /* Disable flow control */
852 if (!on) {
853 if (qt2_setregister(dev, port_priv->device_port,
854 UART_MCR, 0) < 0)
855 dev_warn(&port->dev, "error from flowcontrol urb\n");
856 }
857 /* drop RTS and DTR */
858 if (on)
859 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
860 else
861 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
862 }
863
864 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
865 {
866 struct qt2_port_private *port_priv;
867 u8 newMSR = (u8) *ch;
868 unsigned long flags;
869
870 port_priv = usb_get_serial_port_data(port);
871
872 spin_lock_irqsave(&port_priv->lock, flags);
873 port_priv->shadowMSR = newMSR;
874 spin_unlock_irqrestore(&port_priv->lock, flags);
875
876 if (newMSR & UART_MSR_ANY_DELTA) {
877 /* update input line counters */
878 if (newMSR & UART_MSR_DCTS)
879 port->icount.cts++;
880 if (newMSR & UART_MSR_DDSR)
881 port->icount.dsr++;
882 if (newMSR & UART_MSR_DDCD)
883 port->icount.dcd++;
884 if (newMSR & UART_MSR_TERI)
885 port->icount.rng++;
886
887 wake_up_interruptible(&port->port.delta_msr_wait);
888 }
889 }
890
891 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
892 {
893 struct qt2_port_private *port_priv;
894 struct async_icount *icount;
895 unsigned long flags;
896 u8 newLSR = (u8) *ch;
897
898 port_priv = usb_get_serial_port_data(port);
899
900 if (newLSR & UART_LSR_BI)
901 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
902
903 spin_lock_irqsave(&port_priv->lock, flags);
904 port_priv->shadowLSR = newLSR;
905 spin_unlock_irqrestore(&port_priv->lock, flags);
906
907 icount = &port->icount;
908
909 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
910
911 if (newLSR & UART_LSR_BI)
912 icount->brk++;
913
914 if (newLSR & UART_LSR_OE)
915 icount->overrun++;
916
917 if (newLSR & UART_LSR_PE)
918 icount->parity++;
919
920 if (newLSR & UART_LSR_FE)
921 icount->frame++;
922 }
923
924 }
925
926 static int qt2_write_room(struct tty_struct *tty)
927 {
928 struct usb_serial_port *port = tty->driver_data;
929 struct qt2_port_private *port_priv;
930 unsigned long flags = 0;
931 int r;
932
933 port_priv = usb_get_serial_port_data(port);
934
935 spin_lock_irqsave(&port_priv->urb_lock, flags);
936
937 if (port_priv->urb_in_use)
938 r = 0;
939 else
940 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
941
942 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
943
944 return r;
945 }
946
947 static int qt2_write(struct tty_struct *tty,
948 struct usb_serial_port *port,
949 const unsigned char *buf, int count)
950 {
951 struct qt2_port_private *port_priv;
952 struct urb *write_urb;
953 unsigned char *data;
954 unsigned long flags;
955 int status;
956 int bytes_out = 0;
957
958 port_priv = usb_get_serial_port_data(port);
959
960 if (port_priv->write_urb == NULL) {
961 dev_err(&port->dev, "%s - no output urb\n", __func__);
962 return 0;
963 }
964 write_urb = port_priv->write_urb;
965
966 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
967
968 data = write_urb->transfer_buffer;
969 spin_lock_irqsave(&port_priv->urb_lock, flags);
970 if (port_priv->urb_in_use) {
971 dev_err(&port->dev, "qt2_write - urb is in use\n");
972 goto write_out;
973 }
974
975 *data++ = QT2_CONTROL_BYTE;
976 *data++ = QT2_CONTROL_BYTE;
977 *data++ = port_priv->device_port;
978 put_unaligned_le16(count, data);
979 data += 2;
980 memcpy(data, buf, count);
981
982 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
983
984 status = usb_submit_urb(write_urb, GFP_ATOMIC);
985 if (status == 0) {
986 port_priv->urb_in_use = true;
987 bytes_out += count;
988 }
989
990 write_out:
991 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
992 return bytes_out;
993 }
994
995
996 static struct usb_serial_driver qt2_device = {
997 .driver = {
998 .owner = THIS_MODULE,
999 .name = "quatech-serial",
1000 },
1001 .description = DRIVER_DESC,
1002 .id_table = id_table,
1003 .open = qt2_open,
1004 .close = qt2_close,
1005 .write = qt2_write,
1006 .write_room = qt2_write_room,
1007 .calc_num_ports = qt2_calc_num_ports,
1008 .attach = qt2_attach,
1009 .release = qt2_release,
1010 .disconnect = qt2_disconnect,
1011 .port_probe = qt2_port_probe,
1012 .port_remove = qt2_port_remove,
1013 .dtr_rts = qt2_dtr_rts,
1014 .break_ctl = qt2_break_ctl,
1015 .tiocmget = qt2_tiocmget,
1016 .tiocmset = qt2_tiocmset,
1017 .tiocmiwait = usb_serial_generic_tiocmiwait,
1018 .get_icount = usb_serial_generic_get_icount,
1019 .ioctl = qt2_ioctl,
1020 .set_termios = qt2_set_termios,
1021 };
1022
1023 static struct usb_serial_driver *const serial_drivers[] = {
1024 &qt2_device, NULL
1025 };
1026
1027 module_usb_serial_driver(serial_drivers, id_table);
1028
1029 MODULE_DESCRIPTION(DRIVER_DESC);
1030 MODULE_LICENSE("GPL");
CRIS linux kernel tree