quatech2: switch to ->get_serial()
[muen/linux.git] / drivers / usb / serial / quatech2.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * usb-serial driver for Quatech USB 2 devices
4  *
5  * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
6  *
7  *  These devices all have only 1 bulk in and 1 bulk out that is shared
8  *  for all serial ports.
9  *
10  */
11
12 #include <asm/unaligned.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/tty.h>
16 #include <linux/tty_driver.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/serial.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/serial_reg.h>
23 #include <linux/uaccess.h>
24
25 /* default urb timeout for usb operations */
26 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
27
28 #define QT_OPEN_CLOSE_CHANNEL       0xca
29 #define QT_SET_GET_DEVICE           0xc2
30 #define QT_SET_GET_REGISTER         0xc0
31 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
32 #define QT_SET_ATF                  0xcd
33 #define QT_TRANSFER_IN              0xc0
34 #define QT_HW_FLOW_CONTROL_MASK     0xc5
35 #define QT_SW_FLOW_CONTROL_MASK     0xc6
36 #define QT2_BREAK_CONTROL           0xc8
37 #define QT2_GET_SET_UART            0xc1
38 #define QT2_FLUSH_DEVICE            0xc4
39 #define QT2_GET_SET_QMCR            0xe1
40 #define QT2_QMCR_RS232              0x40
41 #define QT2_QMCR_RS422              0x10
42
43 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
44
45 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
46
47 /* status bytes for the device */
48 #define QT2_CONTROL_BYTE    0x1b
49 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
50 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
51 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
52 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
53 #define QT2_REC_FLUSH       0x04  /* no following info */
54 #define QT2_XMIT_FLUSH      0x05  /* no following info */
55 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
56
57 #define  MAX_BAUD_RATE              921600
58 #define  DEFAULT_BAUD_RATE          9600
59
60 #define QT2_READ_BUFFER_SIZE    512  /* size of read buffer */
61 #define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
62 #define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
63
64 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
65
66 #define USB_VENDOR_ID_QUATECH   0x061d
67 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
68 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
69 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
70 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
71 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
72 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
73 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
74
75 struct qt2_device_detail {
76         int product_id;
77         int num_ports;
78 };
79
80 #define QT_DETAILS(prod, ports) \
81         .product_id = (prod),   \
82         .num_ports = (ports)
83
84 static const struct qt2_device_detail qt2_device_details[] = {
85         {QT_DETAILS(QUATECH_SSU2_100, 1)},
86         {QT_DETAILS(QUATECH_DSU2_400, 2)},
87         {QT_DETAILS(QUATECH_DSU2_100, 2)},
88         {QT_DETAILS(QUATECH_QSU2_400, 4)},
89         {QT_DETAILS(QUATECH_QSU2_100, 4)},
90         {QT_DETAILS(QUATECH_ESU2_400, 8)},
91         {QT_DETAILS(QUATECH_ESU2_100, 8)},
92         {QT_DETAILS(0, 0)}      /* Terminating entry */
93 };
94
95 static const struct usb_device_id id_table[] = {
96         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
97         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
98         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
99         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
100         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
101         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
102         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
103         {}                      /* Terminating entry */
104 };
105 MODULE_DEVICE_TABLE(usb, id_table);
106
107 struct qt2_serial_private {
108         unsigned char current_port;  /* current port for incoming data */
109
110         struct urb      *read_urb;   /* shared among all ports */
111         char            *read_buffer;
112 };
113
114 struct qt2_port_private {
115         u8   device_port;
116
117         spinlock_t urb_lock;
118         bool       urb_in_use;
119         struct urb *write_urb;
120         char       *write_buffer;
121
122         spinlock_t  lock;
123         u8          shadowLSR;
124         u8          shadowMSR;
125
126         struct usb_serial_port *port;
127 };
128
129 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
130 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
131 static void qt2_write_bulk_callback(struct urb *urb);
132 static void qt2_read_bulk_callback(struct urb *urb);
133
134 static void qt2_release(struct usb_serial *serial)
135 {
136         struct qt2_serial_private *serial_priv;
137
138         serial_priv = usb_get_serial_data(serial);
139
140         usb_kill_urb(serial_priv->read_urb);
141         usb_free_urb(serial_priv->read_urb);
142         kfree(serial_priv->read_buffer);
143         kfree(serial_priv);
144 }
145
146 static inline int calc_baud_divisor(int baudrate)
147 {
148         int divisor, rem;
149
150         divisor = MAX_BAUD_RATE / baudrate;
151         rem = MAX_BAUD_RATE % baudrate;
152         /* Round to nearest divisor */
153         if (((rem * 2) >= baudrate) && (baudrate != 110))
154                 divisor++;
155
156         return divisor;
157 }
158
159 static inline int qt2_set_port_config(struct usb_device *dev,
160                                       unsigned char port_number,
161                                       u16 baudrate, u16 lcr)
162 {
163         int divisor = calc_baud_divisor(baudrate);
164         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
165
166         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
167                                QT2_GET_SET_UART, 0x40,
168                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
169 }
170
171 static inline int qt2_control_msg(struct usb_device *dev,
172                                   u8 request, u16 data, u16 index)
173 {
174         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
175                                request, 0x40, data, index,
176                                NULL, 0, QT2_USB_TIMEOUT);
177 }
178
179 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
180 {
181         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
182
183         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
184 }
185
186
187 static inline int qt2_getregister(struct usb_device *dev,
188                                   u8 uart,
189                                   u8 reg,
190                                   u8 *data)
191 {
192         int ret;
193
194         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
195                               QT_SET_GET_REGISTER, 0xc0, reg,
196                               uart, data, sizeof(*data), QT2_USB_TIMEOUT);
197         if (ret < (int)sizeof(*data)) {
198                 if (ret >= 0)
199                         ret = -EIO;
200         }
201
202         return ret;
203 }
204
205 static inline int qt2_setregister(struct usb_device *dev,
206                                   u8 uart, u8 reg, u16 data)
207 {
208         u16 value = (data << 8) | reg;
209
210         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
211                                QT_SET_GET_REGISTER, 0x40, value, uart,
212                                NULL, 0, QT2_USB_TIMEOUT);
213 }
214
215 static inline int update_mctrl(struct qt2_port_private *port_priv,
216                                unsigned int set, unsigned int clear)
217 {
218         struct usb_serial_port *port = port_priv->port;
219         struct usb_device *dev = port->serial->dev;
220         unsigned urb_value;
221         int status;
222
223         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
224                 dev_dbg(&port->dev,
225                         "update_mctrl - DTR|RTS not being set|cleared\n");
226                 return 0;       /* no change */
227         }
228
229         clear &= ~set;  /* 'set' takes precedence over 'clear' */
230         urb_value = 0;
231         if (set & TIOCM_DTR)
232                 urb_value |= UART_MCR_DTR;
233         if (set & TIOCM_RTS)
234                 urb_value |= UART_MCR_RTS;
235
236         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
237                                  urb_value);
238         if (status < 0)
239                 dev_err(&port->dev,
240                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
241                         status);
242         return status;
243 }
244
245 static int qt2_calc_num_ports(struct usb_serial *serial,
246                                         struct usb_serial_endpoints *epds)
247 {
248         struct qt2_device_detail d;
249         int i;
250
251         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
252                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
253                         return d.num_ports;
254         }
255
256         /* we didn't recognize the device */
257         dev_err(&serial->dev->dev,
258                  "don't know the number of ports, assuming 1\n");
259
260         return 1;
261 }
262
263 static void qt2_set_termios(struct tty_struct *tty,
264                             struct usb_serial_port *port,
265                             struct ktermios *old_termios)
266 {
267         struct usb_device *dev = port->serial->dev;
268         struct qt2_port_private *port_priv;
269         struct ktermios *termios = &tty->termios;
270         u16 baud;
271         unsigned int cflag = termios->c_cflag;
272         u16 new_lcr = 0;
273         int status;
274
275         port_priv = usb_get_serial_port_data(port);
276
277         if (cflag & PARENB) {
278                 if (cflag & PARODD)
279                         new_lcr |= UART_LCR_PARITY;
280                 else
281                         new_lcr |= SERIAL_EVEN_PARITY;
282         }
283
284         switch (cflag & CSIZE) {
285         case CS5:
286                 new_lcr |= UART_LCR_WLEN5;
287                 break;
288         case CS6:
289                 new_lcr |= UART_LCR_WLEN6;
290                 break;
291         case CS7:
292                 new_lcr |= UART_LCR_WLEN7;
293                 break;
294         default:
295         case CS8:
296                 new_lcr |= UART_LCR_WLEN8;
297                 break;
298         }
299
300         baud = tty_get_baud_rate(tty);
301         if (!baud)
302                 baud = 9600;
303
304         status = qt2_set_port_config(dev, port_priv->device_port, baud,
305                                      new_lcr);
306         if (status < 0)
307                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
308                         __func__, status);
309
310         if (cflag & CRTSCTS)
311                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
312                                          SERIAL_CRTSCTS,
313                                          port_priv->device_port);
314         else
315                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
316                                          0, port_priv->device_port);
317         if (status < 0)
318                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
319                         __func__, status);
320
321         if (I_IXOFF(tty) || I_IXON(tty)) {
322                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
323
324                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
325                                          x, port_priv->device_port);
326         } else
327                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
328                                          0, port_priv->device_port);
329
330         if (status < 0)
331                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
332                         __func__, status);
333
334 }
335
336 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
337 {
338         struct usb_serial *serial;
339         struct qt2_port_private *port_priv;
340         u8 *data;
341         u16 device_port;
342         int status;
343         unsigned long flags;
344
345         device_port = port->port_number;
346
347         serial = port->serial;
348
349         port_priv = usb_get_serial_port_data(port);
350
351         /* set the port to RS232 mode */
352         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
353                                  QT2_QMCR_RS232, device_port);
354         if (status < 0) {
355                 dev_err(&port->dev,
356                         "%s failed to set RS232 mode for port %i error %i\n",
357                         __func__, device_port, status);
358                 return status;
359         }
360
361         data = kzalloc(2, GFP_KERNEL);
362         if (!data)
363                 return -ENOMEM;
364
365         /* open the port */
366         status = usb_control_msg(serial->dev,
367                                  usb_rcvctrlpipe(serial->dev, 0),
368                                  QT_OPEN_CLOSE_CHANNEL,
369                                  0xc0, 0,
370                                  device_port, data, 2, QT2_USB_TIMEOUT);
371
372         if (status < 2) {
373                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
374                         status);
375                 if (status >= 0)
376                         status = -EIO;
377                 kfree(data);
378                 return status;
379         }
380
381         spin_lock_irqsave(&port_priv->lock, flags);
382         port_priv->shadowLSR = data[0];
383         port_priv->shadowMSR = data[1];
384         spin_unlock_irqrestore(&port_priv->lock, flags);
385
386         kfree(data);
387
388         /* set to default speed and 8bit word size */
389         status = qt2_set_port_config(serial->dev, device_port,
390                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
391         if (status < 0) {
392                 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
393                         __func__, device_port);
394                 return status;
395         }
396
397         port_priv->device_port = (u8) device_port;
398
399         if (tty)
400                 qt2_set_termios(tty, port, &tty->termios);
401
402         return 0;
403
404 }
405
406 static void qt2_close(struct usb_serial_port *port)
407 {
408         struct usb_serial *serial;
409         struct qt2_port_private *port_priv;
410         int i;
411
412         serial = port->serial;
413         port_priv = usb_get_serial_port_data(port);
414
415         usb_kill_urb(port_priv->write_urb);
416
417         /* flush the port transmit buffer */
418         i = usb_control_msg(serial->dev,
419                             usb_rcvctrlpipe(serial->dev, 0),
420                             QT2_FLUSH_DEVICE, 0x40, 1,
421                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
422
423         if (i < 0)
424                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
425                         __func__, i);
426
427         /* flush the port receive buffer */
428         i = usb_control_msg(serial->dev,
429                             usb_rcvctrlpipe(serial->dev, 0),
430                             QT2_FLUSH_DEVICE, 0x40, 0,
431                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
432
433         if (i < 0)
434                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
435                         __func__, i);
436
437         /* close the port */
438         i = usb_control_msg(serial->dev,
439                             usb_sndctrlpipe(serial->dev, 0),
440                             QT_OPEN_CLOSE_CHANNEL,
441                             0x40, 0,
442                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
443
444         if (i < 0)
445                 dev_err(&port->dev, "%s - close port failed %i\n",
446                         __func__, i);
447 }
448
449 static void qt2_disconnect(struct usb_serial *serial)
450 {
451         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
452
453         usb_kill_urb(serial_priv->read_urb);
454 }
455
456 static int get_serial_info(struct tty_struct *tty,
457                            struct serial_struct *ss)
458 {
459         struct usb_serial_port *port = tty->driver_data;
460
461         ss->line                = port->minor;
462         ss->port                = 0;
463         ss->irq                 = 0;
464         ss->xmit_fifo_size      = port->bulk_out_size;
465         ss->baud_base           = 9600;
466         ss->close_delay         = 5*HZ;
467         ss->closing_wait        = 30*HZ;
468         return 0;
469 }
470
471 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
472 {
473         switch (*ch) {
474         case QT2_LINE_STATUS:
475                 qt2_update_lsr(port, ch + 1);
476                 break;
477         case QT2_MODEM_STATUS:
478                 qt2_update_msr(port, ch + 1);
479                 break;
480         }
481 }
482
483 /* not needed, kept to document functionality */
484 static void qt2_process_xmit_empty(struct usb_serial_port *port,
485                                    unsigned char *ch)
486 {
487         int bytes_written;
488
489         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
490 }
491
492 /* not needed, kept to document functionality */
493 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
494 {
495         return;
496 }
497
498 static void qt2_process_read_urb(struct urb *urb)
499 {
500         struct usb_serial *serial;
501         struct qt2_serial_private *serial_priv;
502         struct usb_serial_port *port;
503         struct qt2_port_private *port_priv;
504         bool escapeflag;
505         unsigned char *ch;
506         int i;
507         unsigned char newport;
508         int len = urb->actual_length;
509
510         if (!len)
511                 return;
512
513         ch = urb->transfer_buffer;
514         serial = urb->context;
515         serial_priv = usb_get_serial_data(serial);
516         port = serial->port[serial_priv->current_port];
517         port_priv = usb_get_serial_port_data(port);
518
519         for (i = 0; i < urb->actual_length; i++) {
520                 ch = (unsigned char *)urb->transfer_buffer + i;
521                 if ((i <= (len - 3)) &&
522                     (*ch == QT2_CONTROL_BYTE) &&
523                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
524                         escapeflag = false;
525                         switch (*(ch + 2)) {
526                         case QT2_LINE_STATUS:
527                         case QT2_MODEM_STATUS:
528                                 if (i > (len - 4)) {
529                                         dev_warn(&port->dev,
530                                                  "%s - status message too short\n",
531                                                 __func__);
532                                         break;
533                                 }
534                                 qt2_process_status(port, ch + 2);
535                                 i += 3;
536                                 escapeflag = true;
537                                 break;
538                         case QT2_XMIT_HOLD:
539                                 if (i > (len - 5)) {
540                                         dev_warn(&port->dev,
541                                                  "%s - xmit_empty message too short\n",
542                                                  __func__);
543                                         break;
544                                 }
545                                 qt2_process_xmit_empty(port, ch + 3);
546                                 i += 4;
547                                 escapeflag = true;
548                                 break;
549                         case QT2_CHANGE_PORT:
550                                 if (i > (len - 4)) {
551                                         dev_warn(&port->dev,
552                                                  "%s - change_port message too short\n",
553                                                  __func__);
554                                         break;
555                                 }
556                                 tty_flip_buffer_push(&port->port);
557
558                                 newport = *(ch + 3);
559
560                                 if (newport > serial->num_ports) {
561                                         dev_err(&port->dev,
562                                                 "%s - port change to invalid port: %i\n",
563                                                 __func__, newport);
564                                         break;
565                                 }
566
567                                 serial_priv->current_port = newport;
568                                 port = serial->port[serial_priv->current_port];
569                                 port_priv = usb_get_serial_port_data(port);
570                                 i += 3;
571                                 escapeflag = true;
572                                 break;
573                         case QT2_REC_FLUSH:
574                         case QT2_XMIT_FLUSH:
575                                 qt2_process_flush(port, ch + 2);
576                                 i += 2;
577                                 escapeflag = true;
578                                 break;
579                         case QT2_CONTROL_ESCAPE:
580                                 tty_insert_flip_string(&port->port, ch, 2);
581                                 i += 2;
582                                 escapeflag = true;
583                                 break;
584                         default:
585                                 dev_warn(&port->dev,
586                                          "%s - unsupported command %i\n",
587                                          __func__, *(ch + 2));
588                                 break;
589                         }
590                         if (escapeflag)
591                                 continue;
592                 }
593
594                 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
595         }
596
597         tty_flip_buffer_push(&port->port);
598 }
599
600 static void qt2_write_bulk_callback(struct urb *urb)
601 {
602         struct usb_serial_port *port;
603         struct qt2_port_private *port_priv;
604         unsigned long flags;
605
606         port = urb->context;
607         port_priv = usb_get_serial_port_data(port);
608
609         spin_lock_irqsave(&port_priv->urb_lock, flags);
610
611         port_priv->urb_in_use = false;
612         usb_serial_port_softint(port);
613
614         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
615
616 }
617
618 static void qt2_read_bulk_callback(struct urb *urb)
619 {
620         struct usb_serial *serial = urb->context;
621         int status;
622
623         if (urb->status) {
624                 dev_warn(&serial->dev->dev,
625                          "%s - non-zero urb status: %i\n", __func__,
626                          urb->status);
627                 return;
628         }
629
630         qt2_process_read_urb(urb);
631
632         status = usb_submit_urb(urb, GFP_ATOMIC);
633         if (status != 0)
634                 dev_err(&serial->dev->dev,
635                         "%s - resubmit read urb failed: %i\n",
636                         __func__, status);
637 }
638
639 static int qt2_setup_urbs(struct usb_serial *serial)
640 {
641         struct usb_serial_port *port0;
642         struct qt2_serial_private *serial_priv;
643         int status;
644
645         port0 = serial->port[0];
646
647         serial_priv = usb_get_serial_data(serial);
648         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
649         if (!serial_priv->read_urb)
650                 return -ENOMEM;
651
652         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
653                           usb_rcvbulkpipe(serial->dev,
654                                           port0->bulk_in_endpointAddress),
655                           serial_priv->read_buffer,
656                           QT2_READ_BUFFER_SIZE,
657                           qt2_read_bulk_callback, serial);
658
659         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
660         if (status != 0) {
661                 dev_err(&serial->dev->dev,
662                         "%s - submit read urb failed %i\n", __func__, status);
663                 usb_free_urb(serial_priv->read_urb);
664                 return status;
665         }
666
667         return 0;
668 }
669
670 static int qt2_attach(struct usb_serial *serial)
671 {
672         struct qt2_serial_private *serial_priv;
673         int status;
674
675         /* power on unit */
676         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
677                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
678                                  QT2_USB_TIMEOUT);
679         if (status < 0) {
680                 dev_err(&serial->dev->dev,
681                         "%s - failed to power on unit: %i\n", __func__, status);
682                 return status;
683         }
684
685         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
686         if (!serial_priv)
687                 return -ENOMEM;
688
689         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
690         if (!serial_priv->read_buffer) {
691                 status = -ENOMEM;
692                 goto err_buf;
693         }
694
695         usb_set_serial_data(serial, serial_priv);
696
697         status = qt2_setup_urbs(serial);
698         if (status != 0)
699                 goto attach_failed;
700
701         return 0;
702
703 attach_failed:
704         kfree(serial_priv->read_buffer);
705 err_buf:
706         kfree(serial_priv);
707         return status;
708 }
709
710 static int qt2_port_probe(struct usb_serial_port *port)
711 {
712         struct usb_serial *serial = port->serial;
713         struct qt2_port_private *port_priv;
714         u8 bEndpointAddress;
715
716         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
717         if (!port_priv)
718                 return -ENOMEM;
719
720         spin_lock_init(&port_priv->lock);
721         spin_lock_init(&port_priv->urb_lock);
722         port_priv->port = port;
723
724         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
725         if (!port_priv->write_buffer)
726                 goto err_buf;
727
728         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
729         if (!port_priv->write_urb)
730                 goto err_urb;
731
732         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
733         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
734                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
735                                 port_priv->write_buffer,
736                                 QT2_WRITE_BUFFER_SIZE,
737                                 qt2_write_bulk_callback, port);
738
739         usb_set_serial_port_data(port, port_priv);
740
741         return 0;
742 err_urb:
743         kfree(port_priv->write_buffer);
744 err_buf:
745         kfree(port_priv);
746         return -ENOMEM;
747 }
748
749 static int qt2_port_remove(struct usb_serial_port *port)
750 {
751         struct qt2_port_private *port_priv;
752
753         port_priv = usb_get_serial_port_data(port);
754         usb_free_urb(port_priv->write_urb);
755         kfree(port_priv->write_buffer);
756         kfree(port_priv);
757
758         return 0;
759 }
760
761 static int qt2_tiocmget(struct tty_struct *tty)
762 {
763         struct usb_serial_port *port = tty->driver_data;
764         struct usb_device *dev = port->serial->dev;
765         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
766         u8 *d;
767         int r;
768
769         d = kzalloc(2, GFP_KERNEL);
770         if (!d)
771                 return -ENOMEM;
772
773         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
774         if (r < 0)
775                 goto mget_out;
776
777         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
778         if (r < 0)
779                 goto mget_out;
780
781         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
782             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
783             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
784             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
785             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
786             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
787
788 mget_out:
789         kfree(d);
790         return r;
791 }
792
793 static int qt2_tiocmset(struct tty_struct *tty,
794                         unsigned int set, unsigned int clear)
795 {
796         struct qt2_port_private *port_priv;
797
798         port_priv = usb_get_serial_port_data(tty->driver_data);
799         return update_mctrl(port_priv, set, clear);
800 }
801
802 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
803 {
804         struct usb_serial_port *port = tty->driver_data;
805         struct qt2_port_private *port_priv;
806         int status;
807         u16 val;
808
809         port_priv = usb_get_serial_port_data(port);
810
811         val = (break_state == -1) ? 1 : 0;
812
813         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
814                                  val, port_priv->device_port);
815         if (status < 0)
816                 dev_warn(&port->dev,
817                          "%s - failed to send control message: %i\n", __func__,
818                          status);
819 }
820
821
822
823 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
824 {
825         struct usb_device *dev = port->serial->dev;
826         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
827
828         /* Disable flow control */
829         if (!on) {
830                 if (qt2_setregister(dev, port_priv->device_port,
831                                            UART_MCR, 0) < 0)
832                         dev_warn(&port->dev, "error from flowcontrol urb\n");
833         }
834         /* drop RTS and DTR */
835         if (on)
836                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
837         else
838                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
839 }
840
841 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
842 {
843         struct qt2_port_private *port_priv;
844         u8 newMSR = (u8) *ch;
845         unsigned long flags;
846
847         port_priv = usb_get_serial_port_data(port);
848
849         spin_lock_irqsave(&port_priv->lock, flags);
850         port_priv->shadowMSR = newMSR;
851         spin_unlock_irqrestore(&port_priv->lock, flags);
852
853         if (newMSR & UART_MSR_ANY_DELTA) {
854                 /* update input line counters */
855                 if (newMSR & UART_MSR_DCTS)
856                         port->icount.cts++;
857                 if (newMSR & UART_MSR_DDSR)
858                         port->icount.dsr++;
859                 if (newMSR & UART_MSR_DDCD)
860                         port->icount.dcd++;
861                 if (newMSR & UART_MSR_TERI)
862                         port->icount.rng++;
863
864                 wake_up_interruptible(&port->port.delta_msr_wait);
865         }
866 }
867
868 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
869 {
870         struct qt2_port_private *port_priv;
871         struct async_icount *icount;
872         unsigned long flags;
873         u8 newLSR = (u8) *ch;
874
875         port_priv = usb_get_serial_port_data(port);
876
877         if (newLSR & UART_LSR_BI)
878                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
879
880         spin_lock_irqsave(&port_priv->lock, flags);
881         port_priv->shadowLSR = newLSR;
882         spin_unlock_irqrestore(&port_priv->lock, flags);
883
884         icount = &port->icount;
885
886         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
887
888                 if (newLSR & UART_LSR_BI)
889                         icount->brk++;
890
891                 if (newLSR & UART_LSR_OE)
892                         icount->overrun++;
893
894                 if (newLSR & UART_LSR_PE)
895                         icount->parity++;
896
897                 if (newLSR & UART_LSR_FE)
898                         icount->frame++;
899         }
900
901 }
902
903 static int qt2_write_room(struct tty_struct *tty)
904 {
905         struct usb_serial_port *port = tty->driver_data;
906         struct qt2_port_private *port_priv;
907         unsigned long flags = 0;
908         int r;
909
910         port_priv = usb_get_serial_port_data(port);
911
912         spin_lock_irqsave(&port_priv->urb_lock, flags);
913
914         if (port_priv->urb_in_use)
915                 r = 0;
916         else
917                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
918
919         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
920
921         return r;
922 }
923
924 static int qt2_write(struct tty_struct *tty,
925                      struct usb_serial_port *port,
926                      const unsigned char *buf, int count)
927 {
928         struct qt2_port_private *port_priv;
929         struct urb *write_urb;
930         unsigned char *data;
931         unsigned long flags;
932         int status;
933         int bytes_out = 0;
934
935         port_priv = usb_get_serial_port_data(port);
936
937         if (port_priv->write_urb == NULL) {
938                 dev_err(&port->dev, "%s - no output urb\n", __func__);
939                 return 0;
940         }
941         write_urb = port_priv->write_urb;
942
943         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
944
945         data = write_urb->transfer_buffer;
946         spin_lock_irqsave(&port_priv->urb_lock, flags);
947         if (port_priv->urb_in_use) {
948                 dev_err(&port->dev, "qt2_write - urb is in use\n");
949                 goto write_out;
950         }
951
952         *data++ = QT2_CONTROL_BYTE;
953         *data++ = QT2_CONTROL_BYTE;
954         *data++ = port_priv->device_port;
955         put_unaligned_le16(count, data);
956         data += 2;
957         memcpy(data, buf, count);
958
959         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
960
961         status = usb_submit_urb(write_urb, GFP_ATOMIC);
962         if (status == 0) {
963                 port_priv->urb_in_use = true;
964                 bytes_out += count;
965         }
966
967 write_out:
968         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
969         return bytes_out;
970 }
971
972
973 static struct usb_serial_driver qt2_device = {
974         .driver = {
975                 .owner = THIS_MODULE,
976                 .name = "quatech-serial",
977         },
978         .description         = DRIVER_DESC,
979         .id_table            = id_table,
980         .open                = qt2_open,
981         .close               = qt2_close,
982         .write               = qt2_write,
983         .write_room          = qt2_write_room,
984         .calc_num_ports      = qt2_calc_num_ports,
985         .attach              = qt2_attach,
986         .release             = qt2_release,
987         .disconnect          = qt2_disconnect,
988         .port_probe          = qt2_port_probe,
989         .port_remove         = qt2_port_remove,
990         .dtr_rts             = qt2_dtr_rts,
991         .break_ctl           = qt2_break_ctl,
992         .tiocmget            = qt2_tiocmget,
993         .tiocmset            = qt2_tiocmset,
994         .tiocmiwait          = usb_serial_generic_tiocmiwait,
995         .get_icount          = usb_serial_generic_get_icount,
996         .get_serial          = get_serial_info,
997         .set_termios         = qt2_set_termios,
998 };
999
1000 static struct usb_serial_driver *const serial_drivers[] = {
1001         &qt2_device, NULL
1002 };
1003
1004 module_usb_serial_driver(serial_drivers, id_table);
1005
1006 MODULE_DESCRIPTION(DRIVER_DESC);
1007 MODULE_LICENSE("GPL v2");