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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
30static bool debug;
31
32/* default urb timeout for usb operations */
33#define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
34
35#define QT_OPEN_CLOSE_CHANNEL 0xca
36#define QT_SET_GET_DEVICE 0xc2
37#define QT_SET_GET_REGISTER 0xc0
38#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
39#define QT_SET_ATF 0xcd
40#define QT_TRANSFER_IN 0xc0
41#define QT_HW_FLOW_CONTROL_MASK 0xc5
42#define QT_SW_FLOW_CONTROL_MASK 0xc6
43#define QT2_BREAK_CONTROL 0xc8
44#define QT2_GET_SET_UART 0xc1
45#define QT2_FLUSH_DEVICE 0xc4
46#define QT2_GET_SET_QMCR 0xe1
47#define QT2_QMCR_RS232 0x40
48#define QT2_QMCR_RS422 0x10
49
50#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
51
52#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
53
54/* status bytes for the device */
55#define QT2_CONTROL_BYTE 0x1b
56#define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
57#define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
58#define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
59#define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
60#define QT2_REC_FLUSH 0x04 /* no following info */
61#define QT2_XMIT_FLUSH 0x05 /* no following info */
62#define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
63
64#define MAX_BAUD_RATE 921600
65#define DEFAULT_BAUD_RATE 9600
66
67#define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
68#define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
69
70/* Version Information */
71#define DRIVER_VERSION "v0.1"
72#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
73
74#define USB_VENDOR_ID_QUATECH 0x061d
75#define QUATECH_SSU2_100 0xC120 /* RS232 single port */
76#define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
77#define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
78#define QUATECH_QSU2_100 0xC160 /* RS232 four port */
79#define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
80#define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
81#define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
82
83struct qt2_device_detail {
84 int product_id;
85 int num_ports;
86};
87
88#define QT_DETAILS(prod, ports) \
89 .product_id = (prod), \
90 .num_ports = (ports)
91
92static const struct qt2_device_detail qt2_device_details[] = {
93 {QT_DETAILS(QUATECH_SSU2_100, 1)},
94 {QT_DETAILS(QUATECH_DSU2_400, 2)},
95 {QT_DETAILS(QUATECH_DSU2_100, 2)},
96 {QT_DETAILS(QUATECH_QSU2_400, 4)},
97 {QT_DETAILS(QUATECH_QSU2_100, 4)},
98 {QT_DETAILS(QUATECH_ESU2_400, 8)},
99 {QT_DETAILS(QUATECH_ESU2_100, 8)},
100 {QT_DETAILS(0, 0)} /* Terminating entry */
101};
102
103static const struct usb_device_id id_table[] = {
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
108 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
109 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
110 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
111 {} /* Terminating entry */
112};
113MODULE_DEVICE_TABLE(usb, id_table);
114
115struct qt2_serial_private {
116 unsigned char current_port; /* current port for incoming data */
117
118 struct urb *read_urb; /* shared among all ports */
119 char read_buffer[512];
120};
121
122struct qt2_port_private {
123 bool is_open;
124 u8 device_port;
125
126 spinlock_t urb_lock;
127 bool urb_in_use;
128 struct urb *write_urb;
129 char write_buffer[QT2_WRITE_BUFFER_SIZE];
130
131 spinlock_t lock;
132 u8 shadowLSR;
133 u8 shadowMSR;
134
135 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
136 struct async_icount icount;
137
138 struct usb_serial_port *port;
139};
140
141static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
142static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
143static void qt2_write_bulk_callback(struct urb *urb);
144static void qt2_read_bulk_callback(struct urb *urb);
145
146static void qt2_release(struct usb_serial *serial)
147{
148 int i;
149
150 kfree(usb_get_serial_data(serial));
151
152 for (i = 0; i < serial->num_ports; i++)
153 kfree(usb_get_serial_port_data(serial->port[i]));
154}
155
156static inline int calc_baud_divisor(int baudrate)
157{
158 int divisor, rem;
159
160 divisor = MAX_BAUD_RATE / baudrate;
161 rem = MAX_BAUD_RATE % baudrate;
162 /* Round to nearest divisor */
163 if (((rem * 2) >= baudrate) && (baudrate != 110))
164 divisor++;
165
166 return divisor;
167}
168
169static inline int qt2_set_port_config(struct usb_device *dev,
170 unsigned char port_number,
171 u16 baudrate, u16 lcr)
172{
173 int divisor = calc_baud_divisor(baudrate);
174 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
175
176 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
177 QT2_GET_SET_UART, 0x40,
178 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
179}
180
181static inline int qt2_control_msg(struct usb_device *dev,
182 u8 request, u16 data, u16 index)
183{
184 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
185 request, 0x40, data, index,
186 NULL, 0, QT2_USB_TIMEOUT);
187}
188
189static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
190{
191 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
192
193 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
194}
195
196
197static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
198{
199 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
200 QT_SET_GET_DEVICE, 0xc0, 0, 0,
201 data, 3, QT2_USB_TIMEOUT);
202}
203
204static inline int qt2_getregister(struct usb_device *dev,
205 u8 uart,
206 u8 reg,
207 u8 *data)
208{
209 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
210 QT_SET_GET_REGISTER, 0xc0, reg,
211 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
212
213}
214
215static inline int qt2_setregister(struct usb_device *dev,
216 u8 uart, u8 reg, u16 data)
217{
218 u16 value = (data << 8) | reg;
219
220 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
221 QT_SET_GET_REGISTER, 0x40, value, uart,
222 NULL, 0, QT2_USB_TIMEOUT);
223}
224
225static inline int update_mctrl(struct qt2_port_private *port_priv,
226 unsigned int set, unsigned int clear)
227{
228 struct usb_serial_port *port = port_priv->port;
229 struct usb_device *dev = port->serial->dev;
230 unsigned urb_value;
231 int status;
232
233 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
234 dev_dbg(&port->dev,
235 "update_mctrl - DTR|RTS not being set|cleared\n");
236 return 0; /* no change */
237 }
238
239 clear &= ~set; /* 'set' takes precedence over 'clear' */
240 urb_value = 0;
241 if (set & TIOCM_DTR)
242 urb_value |= UART_MCR_DTR;
243 if (set & TIOCM_RTS)
244 urb_value |= UART_MCR_RTS;
245
246 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
247 urb_value);
248 if (status < 0)
249 dev_err(&port->dev,
250 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
251 status);
252 return status;
253}
254
255static int qt2_calc_num_ports(struct usb_serial *serial)
256{
257 struct qt2_device_detail d;
258 int i;
259
260 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
261 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
262 return d.num_ports;
263 }
264
265 /* we didn't recognize the device */
266 dev_err(&serial->dev->dev,
267 "don't know the number of ports, assuming 1\n");
268
269 return 1;
270}
271
272static void qt2_set_termios(struct tty_struct *tty,
273 struct usb_serial_port *port,
274 struct ktermios *old_termios)
275{
276 struct usb_device *dev = port->serial->dev;
277 struct qt2_port_private *port_priv;
278 struct ktermios *termios = tty->termios;
279 u16 baud;
280 unsigned int cflag = termios->c_cflag;
281 u16 new_lcr = 0;
282 int status;
283
284 port_priv = usb_get_serial_port_data(port);
285
286 if (cflag & PARENB) {
287 if (cflag & PARODD)
288 new_lcr |= UART_LCR_PARITY;
289 else
290 new_lcr |= SERIAL_EVEN_PARITY;
291 }
292
293 switch (cflag & CSIZE) {
294 case CS5:
295 new_lcr |= UART_LCR_WLEN5;
296 break;
297 case CS6:
298 new_lcr |= UART_LCR_WLEN6;
299 break;
300 case CS7:
301 new_lcr |= UART_LCR_WLEN7;
302 break;
303 default:
304 case CS8:
305 new_lcr |= UART_LCR_WLEN8;
306 break;
307 }
308
309 baud = tty_get_baud_rate(tty);
310 if (!baud)
311 baud = 9600;
312
313 status = qt2_set_port_config(dev, port_priv->device_port, baud,
314 new_lcr);
315 if (status < 0)
316 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
317 __func__, status);
318
319 if (cflag & CRTSCTS)
320 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
321 SERIAL_CRTSCTS,
322 port_priv->device_port);
323 else
324 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
325 0, port_priv->device_port);
326 if (status < 0)
327 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
328 __func__, status);
329
330 if (I_IXOFF(tty) || I_IXON(tty)) {
331 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
332
333 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
334 x, port_priv->device_port);
335 } else
336 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
337 0, port_priv->device_port);
338
339 if (status < 0)
340 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
341 __func__, status);
342
343}
344
345static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
346{
347 struct usb_serial *serial;
348 struct qt2_serial_private *serial_priv;
349 struct qt2_port_private *port_priv;
350 u8 *data;
351 u16 device_port;
352 int status;
353 unsigned long flags;
354
355 device_port = (u16) (port->number - port->serial->minor);
356
357 serial = port->serial;
358
359 port_priv = usb_get_serial_port_data(port);
360 serial_priv = usb_get_serial_data(serial);
361
362 /* set the port to RS232 mode */
363 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
364 QT2_QMCR_RS232, device_port);
365 if (status < 0) {
366 dev_err(&port->dev,
367 "%s failed to set RS232 mode for port %i error %i\n",
368 __func__, device_port, status);
369 return status;
370 }
371
372 data = kzalloc(2, GFP_KERNEL);
373 if (!data)
374 return -ENOMEM;
375
376 /* open the port */
377 status = usb_control_msg(serial->dev,
378 usb_rcvctrlpipe(serial->dev, 0),
379 QT_OPEN_CLOSE_CHANNEL,
380 0xc0, 0,
381 device_port, data, 2, QT2_USB_TIMEOUT);
382
383 if (status < 0) {
384 dev_err(&port->dev, "%s - open port failed %i", __func__,
385 status);
386 kfree(data);
387 return status;
388 }
389
390 spin_lock_irqsave(&port_priv->lock, flags);
391 port_priv->shadowLSR = data[0];
392 port_priv->shadowMSR = data[1];
393 spin_unlock_irqrestore(&port_priv->lock, flags);
394
395 kfree(data);
396
397 /* set to default speed and 8bit word size */
398 status = qt2_set_port_config(serial->dev, device_port,
399 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
400 if (status < 0) {
401 dev_err(&port->dev,
402 "%s - initial setup failed for port %i (%i)\n",
403 __func__, port->number, device_port);
404 return status;
405 }
406
407 port_priv->is_open = true;
408 port_priv->device_port = (u8) device_port;
409
410 if (tty)
411 qt2_set_termios(tty, port, tty->termios);
412
413 return 0;
414
415}
416
417static void qt2_close(struct usb_serial_port *port)
418{
419 struct usb_serial *serial;
420 struct qt2_serial_private *serial_priv;
421 struct qt2_port_private *port_priv;
422 unsigned long flags;
423 int i;
424
425 serial = port->serial;
426 serial_priv = usb_get_serial_data(serial);
427 port_priv = usb_get_serial_port_data(port);
428
429 port_priv->is_open = false;
430
431 spin_lock_irqsave(&port_priv->urb_lock, flags);
432 if (port_priv->write_urb->status == -EINPROGRESS)
433 usb_kill_urb(port_priv->write_urb);
434 port_priv->urb_in_use = false;
435 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
436
437 /* flush the port transmit buffer */
438 i = usb_control_msg(serial->dev,
439 usb_rcvctrlpipe(serial->dev, 0),
440 QT2_FLUSH_DEVICE, 0x40, 1,
441 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
442
443 if (i < 0)
444 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
445 __func__, i);
446
447 /* flush the port receive buffer */
448 i = usb_control_msg(serial->dev,
449 usb_rcvctrlpipe(serial->dev, 0),
450 QT2_FLUSH_DEVICE, 0x40, 0,
451 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
452
453 if (i < 0)
454 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
455 __func__, i);
456
457 /* close the port */
458 i = usb_control_msg(serial->dev,
459 usb_sndctrlpipe(serial->dev, 0),
460 QT_OPEN_CLOSE_CHANNEL,
461 0x40, 0,
462 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
463
464 if (i < 0)
465 dev_err(&port->dev, "%s - close port failed %i\n",
466 __func__, i);
467
468}
469
470static void qt2_disconnect(struct usb_serial *serial)
471{
472 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
473 struct qt2_port_private *port_priv;
474 int i;
475
476 if (serial_priv->read_urb->status == -EINPROGRESS)
477 usb_kill_urb(serial_priv->read_urb);
478
479 usb_free_urb(serial_priv->read_urb);
480
481 for (i = 0; i < serial->num_ports; i++) {
482 port_priv = usb_get_serial_port_data(serial->port[i]);
483
484 if (port_priv->write_urb->status == -EINPROGRESS)
485 usb_kill_urb(port_priv->write_urb);
486 usb_free_urb(port_priv->write_urb);
487 }
488}
489
490static int get_serial_info(struct usb_serial_port *port,
491 struct serial_struct __user *retinfo)
492{
493 struct serial_struct tmp;
494
495 if (!retinfo)
496 return -EFAULT;
497
498 memset(&tmp, 0, sizeof(tmp));
499 tmp.line = port->serial->minor;
500 tmp.port = 0;
501 tmp.irq = 0;
502 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
503 tmp.xmit_fifo_size = port->bulk_out_size;
504 tmp.baud_base = 9600;
505 tmp.close_delay = 5*HZ;
506 tmp.closing_wait = 30*HZ;
507
508 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
509 return -EFAULT;
510 return 0;
511}
512
513static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
514{
515 struct qt2_port_private *priv = usb_get_serial_port_data(port);
516 struct async_icount prev, cur;
517 unsigned long flags;
518
519 spin_lock_irqsave(&priv->lock, flags);
520 prev = priv->icount;
521 spin_unlock_irqrestore(&priv->lock, flags);
522
523 while (1) {
524 wait_event_interruptible(priv->delta_msr_wait,
525 ((priv->icount.rng != prev.rng) ||
526 (priv->icount.dsr != prev.dsr) ||
527 (priv->icount.dcd != prev.dcd) ||
528 (priv->icount.cts != prev.cts)));
529
530 if (signal_pending(current))
531 return -ERESTARTSYS;
532
533 spin_lock_irqsave(&priv->lock, flags);
534 cur = priv->icount;
535 spin_unlock_irqrestore(&priv->lock, flags);
536
537 if ((prev.rng == cur.rng) &&
538 (prev.dsr == cur.dsr) &&
539 (prev.dcd == cur.dcd) &&
540 (prev.cts == cur.cts))
541 return -EIO;
542
543 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
544 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
545 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
546 (arg & TIOCM_CTS && (prev.cts != cur.cts)))
547 return 0;
548 }
549 return 0;
550}
551
552static int qt2_get_icount(struct tty_struct *tty,
553 struct serial_icounter_struct *icount)
554{
555 struct usb_serial_port *port = tty->driver_data;
556 struct qt2_port_private *priv = usb_get_serial_port_data(port);
557 struct async_icount cnow = priv->icount;
558
559 icount->cts = cnow.cts;
560 icount->dsr = cnow.dsr;
561 icount->rng = cnow.rng;
562 icount->dcd = cnow.dcd;
563 icount->rx = cnow.rx;
564 icount->tx = cnow.tx;
565 icount->frame = cnow.frame;
566 icount->overrun = cnow.overrun;
567 icount->parity = cnow.parity;
568 icount->brk = cnow.brk;
569 icount->buf_overrun = cnow.buf_overrun;
570
571 return 0;
572}
573
574static int qt2_ioctl(struct tty_struct *tty,
575 unsigned int cmd, unsigned long arg)
576{
577 struct usb_serial_port *port = tty->driver_data;
578
579 switch (cmd) {
580 case TIOCGSERIAL:
581 return get_serial_info(port,
582 (struct serial_struct __user *)arg);
583
584 case TIOCMIWAIT:
585 return wait_modem_info(port, arg);
586
587 default:
588 break;
589 }
590
591 return -ENOIOCTLCMD;
592}
593
594static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
595{
596 switch (*ch) {
597 case QT2_LINE_STATUS:
598 qt2_update_lsr(port, ch + 1);
599 break;
600 case QT2_MODEM_STATUS:
601 qt2_update_msr(port, ch + 1);
602 break;
603 }
604}
605
606/* not needed, kept to document functionality */
607static void qt2_process_xmit_empty(struct usb_serial_port *port,
608 unsigned char *ch)
609{
610 int bytes_written;
611
612 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
613}
614
615/* not needed, kept to document functionality */
616static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
617{
618 return;
619}
620
621void qt2_process_read_urb(struct urb *urb)
622{
623 struct usb_serial *serial;
624 struct qt2_serial_private *serial_priv;
625 struct usb_serial_port *port;
626 struct qt2_port_private *port_priv;
627 struct tty_struct *tty;
628 bool escapeflag;
629 unsigned char *ch;
630 int i;
631 unsigned char newport;
632 int len = urb->actual_length;
633
634 if (!len)
635 return;
636
637 ch = urb->transfer_buffer;
638 tty = NULL;
639 serial = urb->context;
640 serial_priv = usb_get_serial_data(serial);
641 port = serial->port[serial_priv->current_port];
642 port_priv = usb_get_serial_port_data(port);
643
644 if (port_priv->is_open)
645 tty = tty_port_tty_get(&port->port);
646
647 for (i = 0; i < urb->actual_length; i++) {
648 ch = (unsigned char *)urb->transfer_buffer + i;
649 if ((i <= (len - 3)) &&
650 (*ch == QT2_CONTROL_BYTE) &&
651 (*(ch + 1) == QT2_CONTROL_BYTE)) {
652 escapeflag = false;
653 switch (*(ch + 2)) {
654 case QT2_LINE_STATUS:
655 case QT2_MODEM_STATUS:
656 if (i > (len - 4)) {
657 dev_warn(&port->dev,
658 "%s - status message too short\n",
659 __func__);
660 break;
661 }
662 qt2_process_status(port, ch + 2);
663 i += 3;
664 escapeflag = true;
665 break;
666 case QT2_XMIT_HOLD:
667 if (i > (len - 5)) {
668 dev_warn(&port->dev,
669 "%s - xmit_empty message too short\n",
670 __func__);
671 break;
672 }
673 qt2_process_xmit_empty(port, ch + 3);
674 i += 4;
675 escapeflag = true;
676 break;
677 case QT2_CHANGE_PORT:
678 if (i > (len - 4)) {
679 dev_warn(&port->dev,
680 "%s - change_port message too short\n",
681 __func__);
682 break;
683 }
684 if (tty) {
685 tty_flip_buffer_push(tty);
686 tty_kref_put(tty);
687 }
688
689 newport = *(ch + 3);
690
691 if (newport > serial->num_ports) {
692 dev_err(&port->dev,
693 "%s - port change to invalid port: %i\n",
694 __func__, newport);
695 break;
696 }
697
698 serial_priv->current_port = newport;
699 port = serial->port[serial_priv->current_port];
700 port_priv = usb_get_serial_port_data(port);
701 if (port_priv->is_open)
702 tty = tty_port_tty_get(&port->port);
703 else
704 tty = NULL;
705 i += 3;
706 escapeflag = true;
707 break;
708 case QT2_REC_FLUSH:
709 case QT2_XMIT_FLUSH:
710 qt2_process_flush(port, ch + 2);
711 i += 2;
712 escapeflag = true;
713 break;
714 case QT2_CONTROL_ESCAPE:
715 tty_buffer_request_room(tty, 2);
716 tty_insert_flip_string(tty, ch, 2);
717 i += 2;
718 escapeflag = true;
719 break;
720 default:
721 dev_warn(&port->dev,
722 "%s - unsupported command %i\n",
723 __func__, *(ch + 2));
724 break;
725 }
726 if (escapeflag)
727 continue;
728 }
729
730 if (tty) {
731 tty_buffer_request_room(tty, 1);
732 tty_insert_flip_string(tty, ch, 1);
733 }
734 }
735
736 if (tty) {
737 tty_flip_buffer_push(tty);
738 tty_kref_put(tty);
739 }
740}
741
742static void qt2_write_bulk_callback(struct urb *urb)
743{
744 struct usb_serial_port *port;
745 struct qt2_port_private *port_priv;
746
747 port = urb->context;
748 port_priv = usb_get_serial_port_data(port);
749
750 spin_lock(&port_priv->urb_lock);
751
752 port_priv->urb_in_use = false;
753 usb_serial_port_softint(port);
754
755 spin_unlock(&port_priv->urb_lock);
756
757}
758
759static void qt2_read_bulk_callback(struct urb *urb)
760{
761 struct usb_serial *serial = urb->context;
762 int status;
763
764 if (urb->status) {
765 dev_warn(&serial->dev->dev,
766 "%s - non-zero urb status: %i\n", __func__,
767 urb->status);
768 return;
769 }
770
771 qt2_process_read_urb(urb);
772
773 status = usb_submit_urb(urb, GFP_ATOMIC);
774 if (status != 0)
775 dev_err(&serial->dev->dev,
776 "%s - resubmit read urb failed: %i\n",
777 __func__, status);
778}
779
780static int qt2_setup_urbs(struct usb_serial *serial)
781{
782 struct usb_serial_port *port;
783 struct usb_serial_port *port0;
784 struct qt2_serial_private *serial_priv;
785 struct qt2_port_private *port_priv;
786 int pcount, status;
787
788 port0 = serial->port[0];
789
790 serial_priv = usb_get_serial_data(serial);
791 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
792 if (!serial_priv->read_urb) {
793 dev_err(&serial->dev->dev, "No free urbs available\n");
794 return -ENOMEM;
795 }
796
797 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
798 usb_rcvbulkpipe(serial->dev,
799 port0->bulk_in_endpointAddress),
800 serial_priv->read_buffer,
801 sizeof(serial_priv->read_buffer),
802 qt2_read_bulk_callback, serial);
803
804 /* setup write_urb for each port */
805 for (pcount = 0; pcount < serial->num_ports; pcount++) {
806
807 port = serial->port[pcount];
808 port_priv = usb_get_serial_port_data(port);
809
810 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
811 if (!port_priv->write_urb) {
812 dev_err(&serial->dev->dev,
813 "failed to alloc write_urb for port %i\n",
814 pcount);
815 return -ENOMEM;
816 }
817
818 usb_fill_bulk_urb(port_priv->write_urb,
819 serial->dev,
820 usb_sndbulkpipe(serial->dev,
821 port0->
822 bulk_out_endpointAddress),
823 port_priv->write_buffer,
824 sizeof(port_priv->write_buffer),
825 qt2_write_bulk_callback, port);
826 }
827
828 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
829 if (status != 0) {
830 dev_err(&serial->dev->dev,
831 "%s - submit read urb failed %i\n", __func__, status);
832 return status;
833 }
834
835 return 0;
836
837}
838
839static int qt2_attach(struct usb_serial *serial)
840{
841 struct qt2_serial_private *serial_priv;
842 struct qt2_port_private *port_priv;
843 int status, pcount;
844
845 /* power on unit */
846 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
847 0xc2, 0x40, 0x8000, 0, NULL, 0,
848 QT2_USB_TIMEOUT);
849 if (status < 0) {
850 dev_err(&serial->dev->dev,
851 "%s - failed to power on unit: %i\n", __func__, status);
852 return status;
853 }
854
855 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
856 if (!serial_priv) {
857 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
858 return -ENOMEM;
859 }
860
861 usb_set_serial_data(serial, serial_priv);
862
863 for (pcount = 0; pcount < serial->num_ports; pcount++) {
864 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
865 if (!port_priv) {
866 dev_err(&serial->dev->dev,
867 "%s- kmalloc(%Zd) failed.\n", __func__,
868 sizeof(*port_priv));
869 pcount--;
870 status = -ENOMEM;
871 goto attach_failed;
872 }
873
874 spin_lock_init(&port_priv->lock);
875 spin_lock_init(&port_priv->urb_lock);
876 init_waitqueue_head(&port_priv->delta_msr_wait);
877
878 port_priv->port = serial->port[pcount];
879
880 usb_set_serial_port_data(serial->port[pcount], port_priv);
881 }
882
883 status = qt2_setup_urbs(serial);
884 if (status != 0)
885 goto attach_failed;
886
887 return 0;
888
889attach_failed:
890 for (/* empty */; pcount >= 0; pcount--) {
891 port_priv = usb_get_serial_port_data(serial->port[pcount]);
892 kfree(port_priv);
893 }
894 kfree(serial_priv);
895 return status;
896}
897
898static int qt2_tiocmget(struct tty_struct *tty)
899{
900 struct usb_serial_port *port = tty->driver_data;
901 struct usb_device *dev = port->serial->dev;
902 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
903 u8 *d;
904 int r;
905
906 d = kzalloc(2, GFP_KERNEL);
907 if (!d)
908 return -ENOMEM;
909
910 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
911 if (r < 0)
912 goto mget_out;
913
914 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
915 if (r < 0)
916 goto mget_out;
917
918 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
919 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
920 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
921 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
922 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
923 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
924
925mget_out:
926 kfree(d);
927 return r;
928}
929
930static int qt2_tiocmset(struct tty_struct *tty,
931 unsigned int set, unsigned int clear)
932{
933 struct qt2_port_private *port_priv;
934
935 port_priv = usb_get_serial_port_data(tty->driver_data);
936 return update_mctrl(port_priv, set, clear);
937}
938
939static void qt2_break_ctl(struct tty_struct *tty, int break_state)
940{
941 struct usb_serial_port *port = tty->driver_data;
942 struct qt2_port_private *port_priv;
943 int status;
944 u16 val;
945
946 port_priv = usb_get_serial_port_data(port);
947
948 if (!port_priv->is_open) {
949 dev_err(&port->dev,
950 "%s - port is not open\n", __func__);
951 return;
952 }
953
954 val = (break_state == -1) ? 1 : 0;
955
956 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
957 val, port_priv->device_port);
958 if (status < 0)
959 dev_warn(&port->dev,
960 "%s - failed to send control message: %i\n", __func__,
961 status);
962}
963
964
965
966static void qt2_dtr_rts(struct usb_serial_port *port, int on)
967{
968 struct usb_device *dev = port->serial->dev;
969 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
970
971 mutex_lock(&port->serial->disc_mutex);
972 if (!port->serial->disconnected) {
973 /* Disable flow control */
974 if (!on && qt2_setregister(dev, port_priv->device_port,
975 UART_MCR, 0) < 0)
976 dev_warn(&port->dev, "error from flowcontrol urb\n");
977 /* drop RTS and DTR */
978 if (on)
979 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
980 else
981 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
982 }
983 mutex_unlock(&port->serial->disc_mutex);
984}
985
986static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
987{
988 struct qt2_port_private *port_priv;
989 u8 newMSR = (u8) *ch;
990 unsigned long flags;
991
992 port_priv = usb_get_serial_port_data(port);
993
994 spin_lock_irqsave(&port_priv->lock, flags);
995 port_priv->shadowMSR = newMSR;
996 spin_unlock_irqrestore(&port_priv->lock, flags);
997
998 if (newMSR & UART_MSR_ANY_DELTA) {
999 /* update input line counters */
1000 if (newMSR & UART_MSR_DCTS)
1001 port_priv->icount.cts++;
1002
1003 if (newMSR & UART_MSR_DDSR)
1004 port_priv->icount.dsr++;
1005
1006 if (newMSR & UART_MSR_DDCD)
1007 port_priv->icount.dcd++;
1008
1009 if (newMSR & UART_MSR_TERI)
1010 port_priv->icount.rng++;
1011
1012 wake_up_interruptible(&port_priv->delta_msr_wait);
1013 }
1014}
1015
1016static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
1017{
1018 struct qt2_port_private *port_priv;
1019 struct async_icount *icount;
1020 unsigned long flags;
1021 u8 newLSR = (u8) *ch;
1022
1023 port_priv = usb_get_serial_port_data(port);
1024
1025 if (newLSR & UART_LSR_BI)
1026 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1027
1028 spin_lock_irqsave(&port_priv->lock, flags);
1029 port_priv->shadowLSR = newLSR;
1030 spin_unlock_irqrestore(&port_priv->lock, flags);
1031
1032 icount = &port_priv->icount;
1033
1034 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1035
1036 if (newLSR & UART_LSR_BI)
1037 icount->brk++;
1038
1039 if (newLSR & UART_LSR_OE)
1040 icount->overrun++;
1041
1042 if (newLSR & UART_LSR_PE)
1043 icount->parity++;
1044
1045 if (newLSR & UART_LSR_FE)
1046 icount->frame++;
1047 }
1048
1049}
1050
1051static int qt2_write_room(struct tty_struct *tty)
1052{
1053 struct usb_serial_port *port = tty->driver_data;
1054 struct qt2_port_private *port_priv;
1055 unsigned long flags = 0;
1056 int r;
1057
1058 port_priv = usb_get_serial_port_data(port);
1059
1060 spin_lock_irqsave(&port_priv->urb_lock, flags);
1061
1062 if (port_priv->urb_in_use)
1063 r = 0;
1064 else
1065 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1066
1067 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1068
1069 return r;
1070}
1071
1072static int qt2_write(struct tty_struct *tty,
1073 struct usb_serial_port *port,
1074 const unsigned char *buf, int count)
1075{
1076 struct qt2_port_private *port_priv;
1077 struct urb *write_urb;
1078 unsigned char *data;
1079 unsigned long flags;
1080 int status;
1081 int bytes_out = 0;
1082
1083 port_priv = usb_get_serial_port_data(port);
1084
1085 if (port_priv->write_urb == NULL) {
1086 dev_err(&port->dev, "%s - no output urb\n", __func__);
1087 return 0;
1088 }
1089 write_urb = port_priv->write_urb;
1090
1091 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1092
1093 data = write_urb->transfer_buffer;
1094 spin_lock_irqsave(&port_priv->urb_lock, flags);
1095 if (port_priv->urb_in_use == true) {
1096 printk(KERN_INFO "qt2_write - urb is in use\n");
1097 goto write_out;
1098 }
1099
1100 *data++ = QT2_CONTROL_BYTE;
1101 *data++ = QT2_CONTROL_BYTE;
1102 *data++ = port_priv->device_port;
1103 put_unaligned_le16(count, data);
1104 data += 2;
1105 memcpy(data, buf, count);
1106
1107 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1108
1109 status = usb_submit_urb(write_urb, GFP_ATOMIC);
1110 if (status == 0) {
1111 port_priv->urb_in_use = true;
1112 bytes_out += count;
1113 }
1114
1115write_out:
1116 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1117 return bytes_out;
1118}
1119
1120
1121static struct usb_serial_driver qt2_device = {
1122 .driver = {
1123 .owner = THIS_MODULE,
1124 .name = "quatech-serial",
1125 },
1126 .description = DRIVER_DESC,
1127 .id_table = id_table,
1128 .open = qt2_open,
1129 .close = qt2_close,
1130 .write = qt2_write,
1131 .write_room = qt2_write_room,
1132 .calc_num_ports = qt2_calc_num_ports,
1133 .attach = qt2_attach,
1134 .release = qt2_release,
1135 .disconnect = qt2_disconnect,
1136 .dtr_rts = qt2_dtr_rts,
1137 .break_ctl = qt2_break_ctl,
1138 .tiocmget = qt2_tiocmget,
1139 .tiocmset = qt2_tiocmset,
1140 .get_icount = qt2_get_icount,
1141 .ioctl = qt2_ioctl,
1142 .set_termios = qt2_set_termios,
1143};
1144
1145static struct usb_serial_driver *const serial_drivers[] = {
1146 &qt2_device, NULL
1147};
1148
1149module_usb_serial_driver(serial_drivers, id_table);
1150
1151MODULE_DESCRIPTION(DRIVER_DESC);
1152MODULE_LICENSE("GPL");
1153
1154module_param(debug, bool, S_IRUGO | S_IWUSR);
1155MODULE_PARM_DESC(debug, "Debug enabled or not");