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Merge git://www.linux-watchdog.org/linux-watchdog
[linux/fpc-iii.git] / drivers / usb / serial / quatech2.c
blobd99743290fc13c2e81feec43c8bcc5623b4c7c11
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/init.h>
19 #include <linux/slab.h>
20 #include <linux/tty.h>
21 #include <linux/tty_driver.h>
22 #include <linux/tty_flip.h>
23 #include <linux/module.h>
24 #include <linux/serial.h>
25 #include <linux/usb.h>
26 #include <linux/usb/serial.h>
27 #include <linux/serial_reg.h>
28 #include <linux/uaccess.h>
29
30 /* default urb timeout for usb operations */
31 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
32
33 #define QT_OPEN_CLOSE_CHANNEL 0xca
34 #define QT_SET_GET_DEVICE 0xc2
35 #define QT_SET_GET_REGISTER 0xc0
36 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
37 #define QT_SET_ATF 0xcd
38 #define QT_TRANSFER_IN 0xc0
39 #define QT_HW_FLOW_CONTROL_MASK 0xc5
40 #define QT_SW_FLOW_CONTROL_MASK 0xc6
41 #define QT2_BREAK_CONTROL 0xc8
42 #define QT2_GET_SET_UART 0xc1
43 #define QT2_FLUSH_DEVICE 0xc4
44 #define QT2_GET_SET_QMCR 0xe1
45 #define QT2_QMCR_RS232 0x40
46 #define QT2_QMCR_RS422 0x10
47
48 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
49
50 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
51
52 /* status bytes for the device */
53 #define QT2_CONTROL_BYTE 0x1b
54 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
55 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
56 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
57 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
58 #define QT2_REC_FLUSH 0x04 /* no following info */
59 #define QT2_XMIT_FLUSH 0x05 /* no following info */
60 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
61
62 #define MAX_BAUD_RATE 921600
63 #define DEFAULT_BAUD_RATE 9600
64
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[512];
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[QT2_WRITE_BUFFER_SIZE];
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_free_urb(serial_priv->read_urb);
145 kfree(serial_priv);
146 }
147
148 static inline int calc_baud_divisor(int baudrate)
149 {
150 int divisor, rem;
151
152 divisor = MAX_BAUD_RATE / baudrate;
153 rem = MAX_BAUD_RATE % baudrate;
154 /* Round to nearest divisor */
155 if (((rem * 2) >= baudrate) && (baudrate != 110))
156 divisor++;
157
158 return divisor;
159 }
160
161 static inline int qt2_set_port_config(struct usb_device *dev,
162 unsigned char port_number,
163 u16 baudrate, u16 lcr)
164 {
165 int divisor = calc_baud_divisor(baudrate);
166 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
167
168 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
169 QT2_GET_SET_UART, 0x40,
170 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
171 }
172
173 static inline int qt2_control_msg(struct usb_device *dev,
174 u8 request, u16 data, u16 index)
175 {
176 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
177 request, 0x40, data, index,
178 NULL, 0, QT2_USB_TIMEOUT);
179 }
180
181 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
182 {
183 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
184
185 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
186 }
187
188
189 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
190 {
191 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
192 QT_SET_GET_DEVICE, 0xc0, 0, 0,
193 data, 3, QT2_USB_TIMEOUT);
194 }
195
196 static inline int qt2_getregister(struct usb_device *dev,
197 u8 uart,
198 u8 reg,
199 u8 *data)
200 {
201 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
202 QT_SET_GET_REGISTER, 0xc0, reg,
203 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
204
205 }
206
207 static inline int qt2_setregister(struct usb_device *dev,
208 u8 uart, u8 reg, u16 data)
209 {
210 u16 value = (data << 8) | reg;
211
212 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
213 QT_SET_GET_REGISTER, 0x40, value, uart,
214 NULL, 0, QT2_USB_TIMEOUT);
215 }
216
217 static inline int update_mctrl(struct qt2_port_private *port_priv,
218 unsigned int set, unsigned int clear)
219 {
220 struct usb_serial_port *port = port_priv->port;
221 struct usb_device *dev = port->serial->dev;
222 unsigned urb_value;
223 int status;
224
225 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
226 dev_dbg(&port->dev,
227 "update_mctrl - DTR|RTS not being set|cleared\n");
228 return 0; /* no change */
229 }
230
231 clear &= ~set; /* 'set' takes precedence over 'clear' */
232 urb_value = 0;
233 if (set & TIOCM_DTR)
234 urb_value |= UART_MCR_DTR;
235 if (set & TIOCM_RTS)
236 urb_value |= UART_MCR_RTS;
237
238 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
239 urb_value);
240 if (status < 0)
241 dev_err(&port->dev,
242 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
243 status);
244 return status;
245 }
246
247 static int qt2_calc_num_ports(struct usb_serial *serial)
248 {
249 struct qt2_device_detail d;
250 int i;
251
252 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
253 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
254 return d.num_ports;
255 }
256
257 /* we didn't recognize the device */
258 dev_err(&serial->dev->dev,
259 "don't know the number of ports, assuming 1\n");
260
261 return 1;
262 }
263
264 static void qt2_set_termios(struct tty_struct *tty,
265 struct usb_serial_port *port,
266 struct ktermios *old_termios)
267 {
268 struct usb_device *dev = port->serial->dev;
269 struct qt2_port_private *port_priv;
270 struct ktermios *termios = &tty->termios;
271 u16 baud;
272 unsigned int cflag = termios->c_cflag;
273 u16 new_lcr = 0;
274 int status;
275
276 port_priv = usb_get_serial_port_data(port);
277
278 if (cflag & PARENB) {
279 if (cflag & PARODD)
280 new_lcr |= UART_LCR_PARITY;
281 else
282 new_lcr |= SERIAL_EVEN_PARITY;
283 }
284
285 switch (cflag & CSIZE) {
286 case CS5:
287 new_lcr |= UART_LCR_WLEN5;
288 break;
289 case CS6:
290 new_lcr |= UART_LCR_WLEN6;
291 break;
292 case CS7:
293 new_lcr |= UART_LCR_WLEN7;
294 break;
295 default:
296 case CS8:
297 new_lcr |= UART_LCR_WLEN8;
298 break;
299 }
300
301 baud = tty_get_baud_rate(tty);
302 if (!baud)
303 baud = 9600;
304
305 status = qt2_set_port_config(dev, port_priv->device_port, baud,
306 new_lcr);
307 if (status < 0)
308 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
309 __func__, status);
310
311 if (cflag & CRTSCTS)
312 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
313 SERIAL_CRTSCTS,
314 port_priv->device_port);
315 else
316 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
317 0, port_priv->device_port);
318 if (status < 0)
319 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
320 __func__, status);
321
322 if (I_IXOFF(tty) || I_IXON(tty)) {
323 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
324
325 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
326 x, port_priv->device_port);
327 } else
328 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
329 0, port_priv->device_port);
330
331 if (status < 0)
332 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
333 __func__, status);
334
335 }
336
337 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
338 {
339 struct usb_serial *serial;
340 struct qt2_port_private *port_priv;
341 u8 *data;
342 u16 device_port;
343 int status;
344 unsigned long flags;
345
346 device_port = port->port_number;
347
348 serial = port->serial;
349
350 port_priv = usb_get_serial_port_data(port);
351
352 /* set the port to RS232 mode */
353 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
354 QT2_QMCR_RS232, device_port);
355 if (status < 0) {
356 dev_err(&port->dev,
357 "%s failed to set RS232 mode for port %i error %i\n",
358 __func__, device_port, status);
359 return status;
360 }
361
362 data = kzalloc(2, GFP_KERNEL);
363 if (!data)
364 return -ENOMEM;
365
366 /* open the port */
367 status = usb_control_msg(serial->dev,
368 usb_rcvctrlpipe(serial->dev, 0),
369 QT_OPEN_CLOSE_CHANNEL,
370 0xc0, 0,
371 device_port, data, 2, QT2_USB_TIMEOUT);
372
373 if (status < 0) {
374 dev_err(&port->dev, "%s - open port failed %i", __func__,
375 status);
376 kfree(data);
377 return status;
378 }
379
380 spin_lock_irqsave(&port_priv->lock, flags);
381 port_priv->shadowLSR = data[0];
382 port_priv->shadowMSR = data[1];
383 spin_unlock_irqrestore(&port_priv->lock, flags);
384
385 kfree(data);
386
387 /* set to default speed and 8bit word size */
388 status = qt2_set_port_config(serial->dev, device_port,
389 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
390 if (status < 0) {
391 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
392 __func__, device_port);
393 return status;
394 }
395
396 port_priv->device_port = (u8) device_port;
397
398 if (tty)
399 qt2_set_termios(tty, port, &tty->termios);
400
401 return 0;
402
403 }
404
405 static void qt2_close(struct usb_serial_port *port)
406 {
407 struct usb_serial *serial;
408 struct qt2_port_private *port_priv;
409 unsigned long flags;
410 int i;
411
412 serial = port->serial;
413 port_priv = usb_get_serial_port_data(port);
414
415 spin_lock_irqsave(&port_priv->urb_lock, flags);
416 usb_kill_urb(port_priv->write_urb);
417 port_priv->urb_in_use = false;
418 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
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 if (!retinfo)
465 return -EFAULT;
466
467 memset(&tmp, 0, sizeof(tmp));
468 tmp.line = port->minor;
469 tmp.port = 0;
470 tmp.irq = 0;
471 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
472 tmp.xmit_fifo_size = port->bulk_out_size;
473 tmp.baud_base = 9600;
474 tmp.close_delay = 5*HZ;
475 tmp.closing_wait = 30*HZ;
476
477 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
478 return -EFAULT;
479 return 0;
480 }
481
482 static int qt2_ioctl(struct tty_struct *tty,
483 unsigned int cmd, unsigned long arg)
484 {
485 struct usb_serial_port *port = tty->driver_data;
486
487 switch (cmd) {
488 case TIOCGSERIAL:
489 return get_serial_info(port,
490 (struct serial_struct __user *)arg);
491 default:
492 break;
493 }
494
495 return -ENOIOCTLCMD;
496 }
497
498 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
499 {
500 switch (*ch) {
501 case QT2_LINE_STATUS:
502 qt2_update_lsr(port, ch + 1);
503 break;
504 case QT2_MODEM_STATUS:
505 qt2_update_msr(port, ch + 1);
506 break;
507 }
508 }
509
510 /* not needed, kept to document functionality */
511 static void qt2_process_xmit_empty(struct usb_serial_port *port,
512 unsigned char *ch)
513 {
514 int bytes_written;
515
516 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
517 }
518
519 /* not needed, kept to document functionality */
520 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
521 {
522 return;
523 }
524
525 static void qt2_process_read_urb(struct urb *urb)
526 {
527 struct usb_serial *serial;
528 struct qt2_serial_private *serial_priv;
529 struct usb_serial_port *port;
530 struct qt2_port_private *port_priv;
531 bool escapeflag;
532 unsigned char *ch;
533 int i;
534 unsigned char newport;
535 int len = urb->actual_length;
536
537 if (!len)
538 return;
539
540 ch = urb->transfer_buffer;
541 serial = urb->context;
542 serial_priv = usb_get_serial_data(serial);
543 port = serial->port[serial_priv->current_port];
544 port_priv = usb_get_serial_port_data(port);
545
546 for (i = 0; i < urb->actual_length; i++) {
547 ch = (unsigned char *)urb->transfer_buffer + i;
548 if ((i <= (len - 3)) &&
549 (*ch == QT2_CONTROL_BYTE) &&
550 (*(ch + 1) == QT2_CONTROL_BYTE)) {
551 escapeflag = false;
552 switch (*(ch + 2)) {
553 case QT2_LINE_STATUS:
554 case QT2_MODEM_STATUS:
555 if (i > (len - 4)) {
556 dev_warn(&port->dev,
557 "%s - status message too short\n",
558 __func__);
559 break;
560 }
561 qt2_process_status(port, ch + 2);
562 i += 3;
563 escapeflag = true;
564 break;
565 case QT2_XMIT_HOLD:
566 if (i > (len - 5)) {
567 dev_warn(&port->dev,
568 "%s - xmit_empty message too short\n",
569 __func__);
570 break;
571 }
572 qt2_process_xmit_empty(port, ch + 3);
573 i += 4;
574 escapeflag = true;
575 break;
576 case QT2_CHANGE_PORT:
577 if (i > (len - 4)) {
578 dev_warn(&port->dev,
579 "%s - change_port message too short\n",
580 __func__);
581 break;
582 }
583 tty_flip_buffer_push(&port->port);
584
585 newport = *(ch + 3);
586
587 if (newport > serial->num_ports) {
588 dev_err(&port->dev,
589 "%s - port change to invalid port: %i\n",
590 __func__, newport);
591 break;
592 }
593
594 serial_priv->current_port = newport;
595 port = serial->port[serial_priv->current_port];
596 port_priv = usb_get_serial_port_data(port);
597 i += 3;
598 escapeflag = true;
599 break;
600 case QT2_REC_FLUSH:
601 case QT2_XMIT_FLUSH:
602 qt2_process_flush(port, ch + 2);
603 i += 2;
604 escapeflag = true;
605 break;
606 case QT2_CONTROL_ESCAPE:
607 tty_buffer_request_room(&port->port, 2);
608 tty_insert_flip_string(&port->port, ch, 2);
609 i += 2;
610 escapeflag = true;
611 break;
612 default:
613 dev_warn(&port->dev,
614 "%s - unsupported command %i\n",
615 __func__, *(ch + 2));
616 break;
617 }
618 if (escapeflag)
619 continue;
620 }
621
622 tty_buffer_request_room(&port->port, 1);
623 tty_insert_flip_string(&port->port, ch, 1);
624 }
625
626 tty_flip_buffer_push(&port->port);
627 }
628
629 static void qt2_write_bulk_callback(struct urb *urb)
630 {
631 struct usb_serial_port *port;
632 struct qt2_port_private *port_priv;
633
634 port = urb->context;
635 port_priv = usb_get_serial_port_data(port);
636
637 spin_lock(&port_priv->urb_lock);
638
639 port_priv->urb_in_use = false;
640 usb_serial_port_softint(port);
641
642 spin_unlock(&port_priv->urb_lock);
643
644 }
645
646 static void qt2_read_bulk_callback(struct urb *urb)
647 {
648 struct usb_serial *serial = urb->context;
649 int status;
650
651 if (urb->status) {
652 dev_warn(&serial->dev->dev,
653 "%s - non-zero urb status: %i\n", __func__,
654 urb->status);
655 return;
656 }
657
658 qt2_process_read_urb(urb);
659
660 status = usb_submit_urb(urb, GFP_ATOMIC);
661 if (status != 0)
662 dev_err(&serial->dev->dev,
663 "%s - resubmit read urb failed: %i\n",
664 __func__, status);
665 }
666
667 static int qt2_setup_urbs(struct usb_serial *serial)
668 {
669 struct usb_serial_port *port0;
670 struct qt2_serial_private *serial_priv;
671 int status;
672
673 port0 = serial->port[0];
674
675 serial_priv = usb_get_serial_data(serial);
676 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
677 if (!serial_priv->read_urb) {
678 dev_err(&serial->dev->dev, "No free urbs available\n");
679 return -ENOMEM;
680 }
681
682 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
683 usb_rcvbulkpipe(serial->dev,
684 port0->bulk_in_endpointAddress),
685 serial_priv->read_buffer,
686 sizeof(serial_priv->read_buffer),
687 qt2_read_bulk_callback, serial);
688
689 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
690 if (status != 0) {
691 dev_err(&serial->dev->dev,
692 "%s - submit read urb failed %i\n", __func__, status);
693 usb_free_urb(serial_priv->read_urb);
694 return status;
695 }
696
697 return 0;
698 }
699
700 static int qt2_attach(struct usb_serial *serial)
701 {
702 struct qt2_serial_private *serial_priv;
703 int status;
704
705 /* power on unit */
706 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
707 0xc2, 0x40, 0x8000, 0, NULL, 0,
708 QT2_USB_TIMEOUT);
709 if (status < 0) {
710 dev_err(&serial->dev->dev,
711 "%s - failed to power on unit: %i\n", __func__, status);
712 return status;
713 }
714
715 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
716 if (!serial_priv) {
717 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
718 return -ENOMEM;
719 }
720
721 usb_set_serial_data(serial, serial_priv);
722
723 status = qt2_setup_urbs(serial);
724 if (status != 0)
725 goto attach_failed;
726
727 return 0;
728
729 attach_failed:
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_urb = usb_alloc_urb(0, GFP_KERNEL);
749 if (!port_priv->write_urb) {
750 kfree(port_priv);
751 return -ENOMEM;
752 }
753 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
754 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
755 usb_sndbulkpipe(serial->dev, bEndpointAddress),
756 port_priv->write_buffer,
757 sizeof(port_priv->write_buffer),
758 qt2_write_bulk_callback, port);
759
760 usb_set_serial_port_data(port, port_priv);
761
762 return 0;
763 }
764
765 static int qt2_port_remove(struct usb_serial_port *port)
766 {
767 struct qt2_port_private *port_priv;
768
769 port_priv = usb_get_serial_port_data(port);
770 usb_free_urb(port_priv->write_urb);
771 kfree(port_priv);
772
773 return 0;
774 }
775
776 static int qt2_tiocmget(struct tty_struct *tty)
777 {
778 struct usb_serial_port *port = tty->driver_data;
779 struct usb_device *dev = port->serial->dev;
780 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
781 u8 *d;
782 int r;
783
784 d = kzalloc(2, GFP_KERNEL);
785 if (!d)
786 return -ENOMEM;
787
788 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
789 if (r < 0)
790 goto mget_out;
791
792 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
793 if (r < 0)
794 goto mget_out;
795
796 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
797 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
798 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
799 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
800 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
801 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
802
803 mget_out:
804 kfree(d);
805 return r;
806 }
807
808 static int qt2_tiocmset(struct tty_struct *tty,
809 unsigned int set, unsigned int clear)
810 {
811 struct qt2_port_private *port_priv;
812
813 port_priv = usb_get_serial_port_data(tty->driver_data);
814 return update_mctrl(port_priv, set, clear);
815 }
816
817 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
818 {
819 struct usb_serial_port *port = tty->driver_data;
820 struct qt2_port_private *port_priv;
821 int status;
822 u16 val;
823
824 port_priv = usb_get_serial_port_data(port);
825
826 val = (break_state == -1) ? 1 : 0;
827
828 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
829 val, port_priv->device_port);
830 if (status < 0)
831 dev_warn(&port->dev,
832 "%s - failed to send control message: %i\n", __func__,
833 status);
834 }
835
836
837
838 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
839 {
840 struct usb_device *dev = port->serial->dev;
841 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
842
843 /* Disable flow control */
844 if (!on) {
845 if (qt2_setregister(dev, port_priv->device_port,
846 UART_MCR, 0) < 0)
847 dev_warn(&port->dev, "error from flowcontrol urb\n");
848 }
849 /* drop RTS and DTR */
850 if (on)
851 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
852 else
853 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
854 }
855
856 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
857 {
858 struct qt2_port_private *port_priv;
859 u8 newMSR = (u8) *ch;
860 unsigned long flags;
861
862 port_priv = usb_get_serial_port_data(port);
863
864 spin_lock_irqsave(&port_priv->lock, flags);
865 port_priv->shadowMSR = newMSR;
866 spin_unlock_irqrestore(&port_priv->lock, flags);
867
868 if (newMSR & UART_MSR_ANY_DELTA) {
869 /* update input line counters */
870 if (newMSR & UART_MSR_DCTS)
871 port->icount.cts++;
872 if (newMSR & UART_MSR_DDSR)
873 port->icount.dsr++;
874 if (newMSR & UART_MSR_DDCD)
875 port->icount.dcd++;
876 if (newMSR & UART_MSR_TERI)
877 port->icount.rng++;
878
879 wake_up_interruptible(&port->port.delta_msr_wait);
880 }
881 }
882
883 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
884 {
885 struct qt2_port_private *port_priv;
886 struct async_icount *icount;
887 unsigned long flags;
888 u8 newLSR = (u8) *ch;
889
890 port_priv = usb_get_serial_port_data(port);
891
892 if (newLSR & UART_LSR_BI)
893 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
894
895 spin_lock_irqsave(&port_priv->lock, flags);
896 port_priv->shadowLSR = newLSR;
897 spin_unlock_irqrestore(&port_priv->lock, flags);
898
899 icount = &port->icount;
900
901 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
902
903 if (newLSR & UART_LSR_BI)
904 icount->brk++;
905
906 if (newLSR & UART_LSR_OE)
907 icount->overrun++;
908
909 if (newLSR & UART_LSR_PE)
910 icount->parity++;
911
912 if (newLSR & UART_LSR_FE)
913 icount->frame++;
914 }
915
916 }
917
918 static int qt2_write_room(struct tty_struct *tty)
919 {
920 struct usb_serial_port *port = tty->driver_data;
921 struct qt2_port_private *port_priv;
922 unsigned long flags = 0;
923 int r;
924
925 port_priv = usb_get_serial_port_data(port);
926
927 spin_lock_irqsave(&port_priv->urb_lock, flags);
928
929 if (port_priv->urb_in_use)
930 r = 0;
931 else
932 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
933
934 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
935
936 return r;
937 }
938
939 static int qt2_write(struct tty_struct *tty,
940 struct usb_serial_port *port,
941 const unsigned char *buf, int count)
942 {
943 struct qt2_port_private *port_priv;
944 struct urb *write_urb;
945 unsigned char *data;
946 unsigned long flags;
947 int status;
948 int bytes_out = 0;
949
950 port_priv = usb_get_serial_port_data(port);
951
952 if (port_priv->write_urb == NULL) {
953 dev_err(&port->dev, "%s - no output urb\n", __func__);
954 return 0;
955 }
956 write_urb = port_priv->write_urb;
957
958 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
959
960 data = write_urb->transfer_buffer;
961 spin_lock_irqsave(&port_priv->urb_lock, flags);
962 if (port_priv->urb_in_use == true) {
963 dev_err(&port->dev, "qt2_write - urb is in use\n");
964 goto write_out;
965 }
966
967 *data++ = QT2_CONTROL_BYTE;
968 *data++ = QT2_CONTROL_BYTE;
969 *data++ = port_priv->device_port;
970 put_unaligned_le16(count, data);
971 data += 2;
972 memcpy(data, buf, count);
973
974 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
975
976 status = usb_submit_urb(write_urb, GFP_ATOMIC);
977 if (status == 0) {
978 port_priv->urb_in_use = true;
979 bytes_out += count;
980 }
981
982 write_out:
983 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
984 return bytes_out;
985 }
986
987
988 static struct usb_serial_driver qt2_device = {
989 .driver = {
990 .owner = THIS_MODULE,
991 .name = "quatech-serial",
992 },
993 .description = DRIVER_DESC,
994 .id_table = id_table,
995 .open = qt2_open,
996 .close = qt2_close,
997 .write = qt2_write,
998 .write_room = qt2_write_room,
999 .calc_num_ports = qt2_calc_num_ports,
1000 .attach = qt2_attach,
1001 .release = qt2_release,
1002 .disconnect = qt2_disconnect,
1003 .port_probe = qt2_port_probe,
1004 .port_remove = qt2_port_remove,
1005 .dtr_rts = qt2_dtr_rts,
1006 .break_ctl = qt2_break_ctl,
1007 .tiocmget = qt2_tiocmget,
1008 .tiocmset = qt2_tiocmset,
1009 .tiocmiwait = usb_serial_generic_tiocmiwait,
1010 .get_icount = usb_serial_generic_get_icount,
1011 .ioctl = qt2_ioctl,
1012 .set_termios = qt2_set_termios,
1013 };
1014
1015 static struct usb_serial_driver *const serial_drivers[] = {
1016 &qt2_device, NULL
1017 };
1018
1019 module_usb_serial_driver(serial_drivers, id_table);
1020
1021 MODULE_DESCRIPTION(DRIVER_DESC);
1022 MODULE_LICENSE("GPL");
Linux with added FPC-III support