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quatech2.c
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1 /*
2  * usb-serial driver for Quatech USB 2 devices
3  *
4  * Copyright (C) 2012 Bill Pemberton ([email protected])
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 /* Version Information */
69 #define DRIVER_VERSION "v0.1"
70 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
71 
72 #define USB_VENDOR_ID_QUATECH 0x061d
73 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */
74 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
75 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
76 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */
77 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
78 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
79 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
80 
81 struct qt2_device_detail {
82  int product_id;
83  int num_ports;
84 };
85 
86 #define QT_DETAILS(prod, ports) \
87  .product_id = (prod), \
88  .num_ports = (ports)
89 
90 static const struct qt2_device_detail qt2_device_details[] = {
91  {QT_DETAILS(QUATECH_SSU2_100, 1)},
92  {QT_DETAILS(QUATECH_DSU2_400, 2)},
93  {QT_DETAILS(QUATECH_DSU2_100, 2)},
94  {QT_DETAILS(QUATECH_QSU2_400, 4)},
95  {QT_DETAILS(QUATECH_QSU2_100, 4)},
96  {QT_DETAILS(QUATECH_ESU2_400, 8)},
97  {QT_DETAILS(QUATECH_ESU2_100, 8)},
98  {QT_DETAILS(0, 0)} /* Terminating entry */
99 };
100 
101 static const struct usb_device_id id_table[] = {
102  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
103  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
104  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
105  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
106  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
107  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
108  {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
109  {} /* Terminating entry */
110 };
111 MODULE_DEVICE_TABLE(usb, id_table);
112 
113 struct qt2_serial_private {
114  unsigned char current_port; /* current port for incoming data */
115 
116  struct urb *read_urb; /* shared among all ports */
117  char read_buffer[512];
118 };
119 
120 struct qt2_port_private {
121  bool is_open;
122  u8 device_port;
123 
124  spinlock_t urb_lock;
125  bool urb_in_use;
126  struct urb *write_urb;
127  char write_buffer[QT2_WRITE_BUFFER_SIZE];
128 
129  spinlock_t lock;
130  u8 shadowLSR;
131  u8 shadowMSR;
132 
133  wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
134  struct async_icount icount;
135 
136  struct usb_serial_port *port;
137 };
138 
139 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
140 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
141 static void qt2_write_bulk_callback(struct urb *urb);
142 static void qt2_read_bulk_callback(struct urb *urb);
143 
144 static void qt2_release(struct usb_serial *serial)
145 {
146  struct qt2_serial_private *serial_priv;
147 
148  serial_priv = usb_get_serial_data(serial);
149 
150  usb_free_urb(serial_priv->read_urb);
151  kfree(serial_priv);
152 }
153 
154 static inline int calc_baud_divisor(int baudrate)
155 {
156  int divisor, rem;
157 
158  divisor = MAX_BAUD_RATE / baudrate;
159  rem = MAX_BAUD_RATE % baudrate;
160  /* Round to nearest divisor */
161  if (((rem * 2) >= baudrate) && (baudrate != 110))
162  divisor++;
163 
164  return divisor;
165 }
166 
167 static inline int qt2_set_port_config(struct usb_device *dev,
168  unsigned char port_number,
169  u16 baudrate, u16 lcr)
170 {
171  int divisor = calc_baud_divisor(baudrate);
172  u16 index = ((u16) (lcr << 8) | (u16) (port_number));
173 
174  return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
175  QT2_GET_SET_UART, 0x40,
176  divisor, index, NULL, 0, QT2_USB_TIMEOUT);
177 }
178 
179 static inline int qt2_control_msg(struct usb_device *dev,
180  u8 request, u16 data, u16 index)
181 {
182  return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
183  request, 0x40, data, index,
184  NULL, 0, QT2_USB_TIMEOUT);
185 }
186 
187 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
188 {
189  u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
190 
191  return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
192 }
193 
194 
195 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
196 {
197  return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
198  QT_SET_GET_DEVICE, 0xc0, 0, 0,
199  data, 3, QT2_USB_TIMEOUT);
200 }
201 
202 static inline int qt2_getregister(struct usb_device *dev,
203  u8 uart,
204  u8 reg,
205  u8 *data)
206 {
207  return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
208  QT_SET_GET_REGISTER, 0xc0, reg,
209  uart, data, sizeof(*data), QT2_USB_TIMEOUT);
210 
211 }
212 
213 static inline int qt2_setregister(struct usb_device *dev,
214  u8 uart, u8 reg, u16 data)
215 {
216  u16 value = (data << 8) | reg;
217 
218  return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
219  QT_SET_GET_REGISTER, 0x40, value, uart,
220  NULL, 0, QT2_USB_TIMEOUT);
221 }
222 
223 static inline int update_mctrl(struct qt2_port_private *port_priv,
224  unsigned int set, unsigned int clear)
225 {
226  struct usb_serial_port *port = port_priv->port;
227  struct usb_device *dev = port->serial->dev;
228  unsigned urb_value;
229  int status;
230 
231  if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
232  dev_dbg(&port->dev,
233  "update_mctrl - DTR|RTS not being set|cleared\n");
234  return 0; /* no change */
235  }
236 
237  clear &= ~set; /* 'set' takes precedence over 'clear' */
238  urb_value = 0;
239  if (set & TIOCM_DTR)
240  urb_value |= UART_MCR_DTR;
241  if (set & TIOCM_RTS)
242  urb_value |= UART_MCR_RTS;
243 
244  status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
245  urb_value);
246  if (status < 0)
247  dev_err(&port->dev,
248  "update_mctrl - Error from MODEM_CTRL urb: %i\n",
249  status);
250  return status;
251 }
252 
253 static int qt2_calc_num_ports(struct usb_serial *serial)
254 {
255  struct qt2_device_detail d;
256  int i;
257 
258  for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
259  if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
260  return d.num_ports;
261  }
262 
263  /* we didn't recognize the device */
264  dev_err(&serial->dev->dev,
265  "don't know the number of ports, assuming 1\n");
266 
267  return 1;
268 }
269 
270 static void qt2_set_termios(struct tty_struct *tty,
271  struct usb_serial_port *port,
272  struct ktermios *old_termios)
273 {
274  struct usb_device *dev = port->serial->dev;
275  struct qt2_port_private *port_priv;
276  struct ktermios *termios = &tty->termios;
277  u16 baud;
278  unsigned int cflag = termios->c_cflag;
279  u16 new_lcr = 0;
280  int status;
281 
282  port_priv = usb_get_serial_port_data(port);
283 
284  if (cflag & PARENB) {
285  if (cflag & PARODD)
286  new_lcr |= UART_LCR_PARITY;
287  else
288  new_lcr |= SERIAL_EVEN_PARITY;
289  }
290 
291  switch (cflag & CSIZE) {
292  case CS5:
293  new_lcr |= UART_LCR_WLEN5;
294  break;
295  case CS6:
296  new_lcr |= UART_LCR_WLEN6;
297  break;
298  case CS7:
299  new_lcr |= UART_LCR_WLEN7;
300  break;
301  default:
302  case CS8:
303  new_lcr |= UART_LCR_WLEN8;
304  break;
305  }
306 
307  baud = tty_get_baud_rate(tty);
308  if (!baud)
309  baud = 9600;
310 
311  status = qt2_set_port_config(dev, port_priv->device_port, baud,
312  new_lcr);
313  if (status < 0)
314  dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
315  __func__, status);
316 
317  if (cflag & CRTSCTS)
318  status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
319  SERIAL_CRTSCTS,
320  port_priv->device_port);
321  else
322  status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
323  0, port_priv->device_port);
324  if (status < 0)
325  dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
326  __func__, status);
327 
328  if (I_IXOFF(tty) || I_IXON(tty)) {
329  u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
330 
331  status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
332  x, port_priv->device_port);
333  } else
334  status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
335  0, port_priv->device_port);
336 
337  if (status < 0)
338  dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
339  __func__, status);
340 
341 }
342 
343 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
344 {
345  struct usb_serial *serial;
346  struct qt2_port_private *port_priv;
347  u8 *data;
348  u16 device_port;
349  int status;
350  unsigned long flags;
351 
352  device_port = (u16) (port->number - port->serial->minor);
353 
354  serial = port->serial;
355 
356  port_priv = usb_get_serial_port_data(port);
357 
358  /* set the port to RS232 mode */
359  status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
360  QT2_QMCR_RS232, device_port);
361  if (status < 0) {
362  dev_err(&port->dev,
363  "%s failed to set RS232 mode for port %i error %i\n",
364  __func__, device_port, status);
365  return status;
366  }
367 
368  data = kzalloc(2, GFP_KERNEL);
369  if (!data)
370  return -ENOMEM;
371 
372  /* open the port */
373  status = usb_control_msg(serial->dev,
374  usb_rcvctrlpipe(serial->dev, 0),
375  QT_OPEN_CLOSE_CHANNEL,
376  0xc0, 0,
377  device_port, data, 2, QT2_USB_TIMEOUT);
378 
379  if (status < 0) {
380  dev_err(&port->dev, "%s - open port failed %i", __func__,
381  status);
382  kfree(data);
383  return status;
384  }
385 
386  spin_lock_irqsave(&port_priv->lock, flags);
387  port_priv->shadowLSR = data[0];
388  port_priv->shadowMSR = data[1];
389  spin_unlock_irqrestore(&port_priv->lock, flags);
390 
391  kfree(data);
392 
393  /* set to default speed and 8bit word size */
394  status = qt2_set_port_config(serial->dev, device_port,
395  DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
396  if (status < 0) {
397  dev_err(&port->dev,
398  "%s - initial setup failed for port %i (%i)\n",
399  __func__, port->number, device_port);
400  return status;
401  }
402 
403  port_priv->is_open = true;
404  port_priv->device_port = (u8) device_port;
405 
406  if (tty)
407  qt2_set_termios(tty, port, &tty->termios);
408 
409  return 0;
410 
411 }
412 
413 static void qt2_close(struct usb_serial_port *port)
414 {
415  struct usb_serial *serial;
416  struct qt2_port_private *port_priv;
417  unsigned long flags;
418  int i;
419 
420  serial = port->serial;
421  port_priv = usb_get_serial_port_data(port);
422 
423  port_priv->is_open = false;
424 
425  spin_lock_irqsave(&port_priv->urb_lock, flags);
426  usb_kill_urb(port_priv->write_urb);
427  port_priv->urb_in_use = false;
428  spin_unlock_irqrestore(&port_priv->urb_lock, flags);
429 
430  mutex_lock(&port->serial->disc_mutex);
431  if (port->serial->disconnected) {
432  mutex_unlock(&port->serial->disc_mutex);
433  return;
434  }
435 
436  /* flush the port transmit buffer */
437  i = usb_control_msg(serial->dev,
438  usb_rcvctrlpipe(serial->dev, 0),
439  QT2_FLUSH_DEVICE, 0x40, 1,
440  port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
441 
442  if (i < 0)
443  dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
444  __func__, i);
445 
446  /* flush the port receive buffer */
447  i = usb_control_msg(serial->dev,
448  usb_rcvctrlpipe(serial->dev, 0),
449  QT2_FLUSH_DEVICE, 0x40, 0,
450  port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
451 
452  if (i < 0)
453  dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
454  __func__, i);
455 
456  /* close the port */
457  i = usb_control_msg(serial->dev,
458  usb_sndctrlpipe(serial->dev, 0),
459  QT_OPEN_CLOSE_CHANNEL,
460  0x40, 0,
461  port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
462 
463  if (i < 0)
464  dev_err(&port->dev, "%s - close port failed %i\n",
465  __func__, i);
466 
467  mutex_unlock(&port->serial->disc_mutex);
468 }
469 
470 static void qt2_disconnect(struct usb_serial *serial)
471 {
472  struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
473 
474  usb_kill_urb(serial_priv->read_urb);
475 }
476 
477 static int get_serial_info(struct usb_serial_port *port,
478  struct serial_struct __user *retinfo)
479 {
480  struct serial_struct tmp;
481 
482  if (!retinfo)
483  return -EFAULT;
484 
485  memset(&tmp, 0, sizeof(tmp));
486  tmp.line = port->serial->minor;
487  tmp.port = 0;
488  tmp.irq = 0;
489  tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
490  tmp.xmit_fifo_size = port->bulk_out_size;
491  tmp.baud_base = 9600;
492  tmp.close_delay = 5*HZ;
493  tmp.closing_wait = 30*HZ;
494 
495  if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
496  return -EFAULT;
497  return 0;
498 }
499 
500 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
501 {
502  struct qt2_port_private *priv = usb_get_serial_port_data(port);
503  struct async_icount prev, cur;
504  unsigned long flags;
505 
506  spin_lock_irqsave(&priv->lock, flags);
507  prev = priv->icount;
508  spin_unlock_irqrestore(&priv->lock, flags);
509 
510  while (1) {
511  wait_event_interruptible(priv->delta_msr_wait,
512  ((priv->icount.rng != prev.rng) ||
513  (priv->icount.dsr != prev.dsr) ||
514  (priv->icount.dcd != prev.dcd) ||
515  (priv->icount.cts != prev.cts)));
516 
517  if (signal_pending(current))
518  return -ERESTARTSYS;
519 
520  spin_lock_irqsave(&priv->lock, flags);
521  cur = priv->icount;
522  spin_unlock_irqrestore(&priv->lock, flags);
523 
524  if ((prev.rng == cur.rng) &&
525  (prev.dsr == cur.dsr) &&
526  (prev.dcd == cur.dcd) &&
527  (prev.cts == cur.cts))
528  return -EIO;
529 
530  if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
531  (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
532  (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
533  (arg & TIOCM_CTS && (prev.cts != cur.cts)))
534  return 0;
535  }
536  return 0;
537 }
538 
539 static int qt2_get_icount(struct tty_struct *tty,
540  struct serial_icounter_struct *icount)
541 {
542  struct usb_serial_port *port = tty->driver_data;
543  struct qt2_port_private *priv = usb_get_serial_port_data(port);
544  struct async_icount cnow = priv->icount;
545 
546  icount->cts = cnow.cts;
547  icount->dsr = cnow.dsr;
548  icount->rng = cnow.rng;
549  icount->dcd = cnow.dcd;
550  icount->rx = cnow.rx;
551  icount->tx = cnow.tx;
552  icount->frame = cnow.frame;
553  icount->overrun = cnow.overrun;
554  icount->parity = cnow.parity;
555  icount->brk = cnow.brk;
556  icount->buf_overrun = cnow.buf_overrun;
557 
558  return 0;
559 }
560 
561 static int qt2_ioctl(struct tty_struct *tty,
562  unsigned int cmd, unsigned long arg)
563 {
564  struct usb_serial_port *port = tty->driver_data;
565 
566  switch (cmd) {
567  case TIOCGSERIAL:
568  return get_serial_info(port,
569  (struct serial_struct __user *)arg);
570 
571  case TIOCMIWAIT:
572  return wait_modem_info(port, arg);
573 
574  default:
575  break;
576  }
577 
578  return -ENOIOCTLCMD;
579 }
580 
581 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
582 {
583  switch (*ch) {
584  case QT2_LINE_STATUS:
585  qt2_update_lsr(port, ch + 1);
586  break;
587  case QT2_MODEM_STATUS:
588  qt2_update_msr(port, ch + 1);
589  break;
590  }
591 }
592 
593 /* not needed, kept to document functionality */
594 static void qt2_process_xmit_empty(struct usb_serial_port *port,
595  unsigned char *ch)
596 {
597  int bytes_written;
598 
599  bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
600 }
601 
602 /* not needed, kept to document functionality */
603 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
604 {
605  return;
606 }
607 
608 void qt2_process_read_urb(struct urb *urb)
609 {
610  struct usb_serial *serial;
611  struct qt2_serial_private *serial_priv;
612  struct usb_serial_port *port;
613  struct qt2_port_private *port_priv;
614  struct tty_struct *tty;
615  bool escapeflag;
616  unsigned char *ch;
617  int i;
618  unsigned char newport;
619  int len = urb->actual_length;
620 
621  if (!len)
622  return;
623 
624  ch = urb->transfer_buffer;
625  tty = NULL;
626  serial = urb->context;
627  serial_priv = usb_get_serial_data(serial);
628  port = serial->port[serial_priv->current_port];
629  port_priv = usb_get_serial_port_data(port);
630 
631  if (port_priv->is_open)
632  tty = tty_port_tty_get(&port->port);
633 
634  for (i = 0; i < urb->actual_length; i++) {
635  ch = (unsigned char *)urb->transfer_buffer + i;
636  if ((i <= (len - 3)) &&
637  (*ch == QT2_CONTROL_BYTE) &&
638  (*(ch + 1) == QT2_CONTROL_BYTE)) {
639  escapeflag = false;
640  switch (*(ch + 2)) {
641  case QT2_LINE_STATUS:
642  case QT2_MODEM_STATUS:
643  if (i > (len - 4)) {
644  dev_warn(&port->dev,
645  "%s - status message too short\n",
646  __func__);
647  break;
648  }
649  qt2_process_status(port, ch + 2);
650  i += 3;
651  escapeflag = true;
652  break;
653  case QT2_XMIT_HOLD:
654  if (i > (len - 5)) {
655  dev_warn(&port->dev,
656  "%s - xmit_empty message too short\n",
657  __func__);
658  break;
659  }
660  qt2_process_xmit_empty(port, ch + 3);
661  i += 4;
662  escapeflag = true;
663  break;
664  case QT2_CHANGE_PORT:
665  if (i > (len - 4)) {
666  dev_warn(&port->dev,
667  "%s - change_port message too short\n",
668  __func__);
669  break;
670  }
671  if (tty) {
672  tty_flip_buffer_push(tty);
673  tty_kref_put(tty);
674  }
675 
676  newport = *(ch + 3);
677 
678  if (newport > serial->num_ports) {
679  dev_err(&port->dev,
680  "%s - port change to invalid port: %i\n",
681  __func__, newport);
682  break;
683  }
684 
685  serial_priv->current_port = newport;
686  port = serial->port[serial_priv->current_port];
687  port_priv = usb_get_serial_port_data(port);
688  if (port_priv->is_open)
689  tty = tty_port_tty_get(&port->port);
690  else
691  tty = NULL;
692  i += 3;
693  escapeflag = true;
694  break;
695  case QT2_REC_FLUSH:
696  case QT2_XMIT_FLUSH:
697  qt2_process_flush(port, ch + 2);
698  i += 2;
699  escapeflag = true;
700  break;
701  case QT2_CONTROL_ESCAPE:
702  tty_buffer_request_room(tty, 2);
703  tty_insert_flip_string(tty, ch, 2);
704  i += 2;
705  escapeflag = true;
706  break;
707  default:
708  dev_warn(&port->dev,
709  "%s - unsupported command %i\n",
710  __func__, *(ch + 2));
711  break;
712  }
713  if (escapeflag)
714  continue;
715  }
716 
717  if (tty) {
718  tty_buffer_request_room(tty, 1);
719  tty_insert_flip_string(tty, ch, 1);
720  }
721  }
722 
723  if (tty) {
724  tty_flip_buffer_push(tty);
725  tty_kref_put(tty);
726  }
727 }
728 
729 static void qt2_write_bulk_callback(struct urb *urb)
730 {
731  struct usb_serial_port *port;
732  struct qt2_port_private *port_priv;
733 
734  port = urb->context;
735  port_priv = usb_get_serial_port_data(port);
736 
737  spin_lock(&port_priv->urb_lock);
738 
739  port_priv->urb_in_use = false;
740  usb_serial_port_softint(port);
741 
742  spin_unlock(&port_priv->urb_lock);
743 
744 }
745 
746 static void qt2_read_bulk_callback(struct urb *urb)
747 {
748  struct usb_serial *serial = urb->context;
749  int status;
750 
751  if (urb->status) {
752  dev_warn(&serial->dev->dev,
753  "%s - non-zero urb status: %i\n", __func__,
754  urb->status);
755  return;
756  }
757 
758  qt2_process_read_urb(urb);
759 
760  status = usb_submit_urb(urb, GFP_ATOMIC);
761  if (status != 0)
762  dev_err(&serial->dev->dev,
763  "%s - resubmit read urb failed: %i\n",
764  __func__, status);
765 }
766 
767 static int qt2_setup_urbs(struct usb_serial *serial)
768 {
769  struct usb_serial_port *port0;
770  struct qt2_serial_private *serial_priv;
771  int status;
772 
773  port0 = serial->port[0];
774 
775  serial_priv = usb_get_serial_data(serial);
776  serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
777  if (!serial_priv->read_urb) {
778  dev_err(&serial->dev->dev, "No free urbs available\n");
779  return -ENOMEM;
780  }
781 
782  usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
783  usb_rcvbulkpipe(serial->dev,
784  port0->bulk_in_endpointAddress),
785  serial_priv->read_buffer,
786  sizeof(serial_priv->read_buffer),
787  qt2_read_bulk_callback, serial);
788 
789  status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
790  if (status != 0) {
791  dev_err(&serial->dev->dev,
792  "%s - submit read urb failed %i\n", __func__, status);
793  usb_free_urb(serial_priv->read_urb);
794  return status;
795  }
796 
797  return 0;
798 }
799 
800 static int qt2_attach(struct usb_serial *serial)
801 {
802  struct qt2_serial_private *serial_priv;
803  int status;
804 
805  /* power on unit */
806  status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
807  0xc2, 0x40, 0x8000, 0, NULL, 0,
808  QT2_USB_TIMEOUT);
809  if (status < 0) {
810  dev_err(&serial->dev->dev,
811  "%s - failed to power on unit: %i\n", __func__, status);
812  return status;
813  }
814 
815  serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
816  if (!serial_priv) {
817  dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
818  return -ENOMEM;
819  }
820 
821  usb_set_serial_data(serial, serial_priv);
822 
823  status = qt2_setup_urbs(serial);
824  if (status != 0)
825  goto attach_failed;
826 
827  return 0;
828 
829 attach_failed:
830  kfree(serial_priv);
831  return status;
832 }
833 
834 static int qt2_port_probe(struct usb_serial_port *port)
835 {
836  struct usb_serial *serial = port->serial;
837  struct qt2_port_private *port_priv;
838  u8 bEndpointAddress;
839 
840  port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
841  if (!port_priv)
842  return -ENOMEM;
843 
844  spin_lock_init(&port_priv->lock);
845  spin_lock_init(&port_priv->urb_lock);
846  init_waitqueue_head(&port_priv->delta_msr_wait);
847  port_priv->port = port;
848 
849  port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
850  if (!port_priv->write_urb) {
851  kfree(port_priv);
852  return -ENOMEM;
853  }
854  bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
855  usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
856  usb_sndbulkpipe(serial->dev, bEndpointAddress),
857  port_priv->write_buffer,
858  sizeof(port_priv->write_buffer),
859  qt2_write_bulk_callback, port);
860 
861  usb_set_serial_port_data(port, port_priv);
862 
863  return 0;
864 }
865 
866 static int qt2_port_remove(struct usb_serial_port *port)
867 {
868  struct qt2_port_private *port_priv;
869 
870  port_priv = usb_get_serial_port_data(port);
871  usb_free_urb(port_priv->write_urb);
872  kfree(port_priv);
873 
874  return 0;
875 }
876 
877 static int qt2_tiocmget(struct tty_struct *tty)
878 {
879  struct usb_serial_port *port = tty->driver_data;
880  struct usb_device *dev = port->serial->dev;
881  struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
882  u8 *d;
883  int r;
884 
885  d = kzalloc(2, GFP_KERNEL);
886  if (!d)
887  return -ENOMEM;
888 
889  r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
890  if (r < 0)
891  goto mget_out;
892 
893  r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
894  if (r < 0)
895  goto mget_out;
896 
897  r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
898  (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
899  (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
900  (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
901  (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
902  (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
903 
904 mget_out:
905  kfree(d);
906  return r;
907 }
908 
909 static int qt2_tiocmset(struct tty_struct *tty,
910  unsigned int set, unsigned int clear)
911 {
912  struct qt2_port_private *port_priv;
913 
914  port_priv = usb_get_serial_port_data(tty->driver_data);
915  return update_mctrl(port_priv, set, clear);
916 }
917 
918 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
919 {
920  struct usb_serial_port *port = tty->driver_data;
921  struct qt2_port_private *port_priv;
922  int status;
923  u16 val;
924 
925  port_priv = usb_get_serial_port_data(port);
926 
927  if (!port_priv->is_open) {
928  dev_err(&port->dev,
929  "%s - port is not open\n", __func__);
930  return;
931  }
932 
933  val = (break_state == -1) ? 1 : 0;
934 
935  status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
936  val, port_priv->device_port);
937  if (status < 0)
938  dev_warn(&port->dev,
939  "%s - failed to send control message: %i\n", __func__,
940  status);
941 }
942 
943 
944 
945 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
946 {
947  struct usb_device *dev = port->serial->dev;
948  struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
949 
950  mutex_lock(&port->serial->disc_mutex);
951  if (!port->serial->disconnected) {
952  /* Disable flow control */
953  if (!on && qt2_setregister(dev, port_priv->device_port,
954  UART_MCR, 0) < 0)
955  dev_warn(&port->dev, "error from flowcontrol urb\n");
956  /* drop RTS and DTR */
957  if (on)
958  update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
959  else
960  update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
961  }
962  mutex_unlock(&port->serial->disc_mutex);
963 }
964 
965 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
966 {
967  struct qt2_port_private *port_priv;
968  u8 newMSR = (u8) *ch;
969  unsigned long flags;
970 
971  port_priv = usb_get_serial_port_data(port);
972 
973  spin_lock_irqsave(&port_priv->lock, flags);
974  port_priv->shadowMSR = newMSR;
975  spin_unlock_irqrestore(&port_priv->lock, flags);
976 
977  if (newMSR & UART_MSR_ANY_DELTA) {
978  /* update input line counters */
979  if (newMSR & UART_MSR_DCTS)
980  port_priv->icount.cts++;
981 
982  if (newMSR & UART_MSR_DDSR)
983  port_priv->icount.dsr++;
984 
985  if (newMSR & UART_MSR_DDCD)
986  port_priv->icount.dcd++;
987 
988  if (newMSR & UART_MSR_TERI)
989  port_priv->icount.rng++;
990 
991  wake_up_interruptible(&port_priv->delta_msr_wait);
992  }
993 }
994 
995 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
996 {
997  struct qt2_port_private *port_priv;
998  struct async_icount *icount;
999  unsigned long flags;
1000  u8 newLSR = (u8) *ch;
1001 
1002  port_priv = usb_get_serial_port_data(port);
1003 
1004  if (newLSR & UART_LSR_BI)
1005  newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1006 
1007  spin_lock_irqsave(&port_priv->lock, flags);
1008  port_priv->shadowLSR = newLSR;
1009  spin_unlock_irqrestore(&port_priv->lock, flags);
1010 
1011  icount = &port_priv->icount;
1012 
1013  if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1014 
1015  if (newLSR & UART_LSR_BI)
1016  icount->brk++;
1017 
1018  if (newLSR & UART_LSR_OE)
1019  icount->overrun++;
1020 
1021  if (newLSR & UART_LSR_PE)
1022  icount->parity++;
1023 
1024  if (newLSR & UART_LSR_FE)
1025  icount->frame++;
1026  }
1027 
1028 }
1029 
1030 static int qt2_write_room(struct tty_struct *tty)
1031 {
1032  struct usb_serial_port *port = tty->driver_data;
1033  struct qt2_port_private *port_priv;
1034  unsigned long flags = 0;
1035  int r;
1036 
1037  port_priv = usb_get_serial_port_data(port);
1038 
1039  spin_lock_irqsave(&port_priv->urb_lock, flags);
1040 
1041  if (port_priv->urb_in_use)
1042  r = 0;
1043  else
1044  r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1045 
1046  spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1047 
1048  return r;
1049 }
1050 
1051 static int qt2_write(struct tty_struct *tty,
1052  struct usb_serial_port *port,
1053  const unsigned char *buf, int count)
1054 {
1055  struct qt2_port_private *port_priv;
1056  struct urb *write_urb;
1057  unsigned char *data;
1058  unsigned long flags;
1059  int status;
1060  int bytes_out = 0;
1061 
1062  port_priv = usb_get_serial_port_data(port);
1063 
1064  if (port_priv->write_urb == NULL) {
1065  dev_err(&port->dev, "%s - no output urb\n", __func__);
1066  return 0;
1067  }
1068  write_urb = port_priv->write_urb;
1069 
1070  count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1071 
1072  data = write_urb->transfer_buffer;
1073  spin_lock_irqsave(&port_priv->urb_lock, flags);
1074  if (port_priv->urb_in_use == true) {
1075  dev_err(&port->dev, "qt2_write - urb is in use\n");
1076  goto write_out;
1077  }
1078 
1079  *data++ = QT2_CONTROL_BYTE;
1080  *data++ = QT2_CONTROL_BYTE;
1081  *data++ = port_priv->device_port;
1082  put_unaligned_le16(count, data);
1083  data += 2;
1084  memcpy(data, buf, count);
1085 
1086  write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1087 
1088  status = usb_submit_urb(write_urb, GFP_ATOMIC);
1089  if (status == 0) {
1090  port_priv->urb_in_use = true;
1091  bytes_out += count;
1092  }
1093 
1094 write_out:
1095  spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1096  return bytes_out;
1097 }
1098 
1099 
1100 static struct usb_serial_driver qt2_device = {
1101  .driver = {
1102  .owner = THIS_MODULE,
1103  .name = "quatech-serial",
1104  },
1105  .description = DRIVER_DESC,
1106  .id_table = id_table,
1107  .open = qt2_open,
1108  .close = qt2_close,
1109  .write = qt2_write,
1110  .write_room = qt2_write_room,
1111  .calc_num_ports = qt2_calc_num_ports,
1112  .attach = qt2_attach,
1113  .release = qt2_release,
1114  .disconnect = qt2_disconnect,
1115  .port_probe = qt2_port_probe,
1116  .port_remove = qt2_port_remove,
1117  .dtr_rts = qt2_dtr_rts,
1118  .break_ctl = qt2_break_ctl,
1119  .tiocmget = qt2_tiocmget,
1120  .tiocmset = qt2_tiocmset,
1121  .get_icount = qt2_get_icount,
1122  .ioctl = qt2_ioctl,
1123  .set_termios = qt2_set_termios,
1124 };
1125 
1126 static struct usb_serial_driver *const serial_drivers[] = {
1127  &qt2_device, NULL
1128 };
1129 
1130 module_usb_serial_driver(serial_drivers, id_table);
1131 
1132 MODULE_DESCRIPTION(DRIVER_DESC);
1133 MODULE_LICENSE("GPL");
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