Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/usb/serial/quatech2.c

  1 /*
  2  * usb-serial driver for Quatech USB 2 devices
  3  *
  4  * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License version 2
  8  * as published by the Free Software Foundation.
  9  *
 10  *
 11  *  These devices all have only 1 bulk in and 1 bulk out that is shared
 12  *  for all serial ports.
 13  *
 14  */
 15 
 16 #include <asm/unaligned.h>
 17 #include <linux/errno.h>
 18 #include <linux/slab.h>
 19 #include <linux/tty.h>
 20 #include <linux/tty_driver.h>
 21 #include <linux/tty_flip.h>
 22 #include <linux/module.h>
 23 #include <linux/serial.h>
 24 #include <linux/usb.h>
 25 #include <linux/usb/serial.h>
 26 #include <linux/serial_reg.h>
 27 #include <linux/uaccess.h>
 28 
 29 /* default urb timeout for usb operations */
 30 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
 31 
 32 #define QT_OPEN_CLOSE_CHANNEL       0xca
 33 #define QT_SET_GET_DEVICE           0xc2
 34 #define QT_SET_GET_REGISTER         0xc0
 35 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
 36 #define QT_SET_ATF                  0xcd
 37 #define QT_TRANSFER_IN              0xc0
 38 #define QT_HW_FLOW_CONTROL_MASK     0xc5
 39 #define QT_SW_FLOW_CONTROL_MASK     0xc6
 40 #define QT2_BREAK_CONTROL           0xc8
 41 #define QT2_GET_SET_UART            0xc1
 42 #define QT2_FLUSH_DEVICE            0xc4
 43 #define QT2_GET_SET_QMCR            0xe1
 44 #define QT2_QMCR_RS232              0x40
 45 #define QT2_QMCR_RS422              0x10
 46 
 47 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
 48 
 49 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
 50 
 51 /* status bytes for the device */
 52 #define QT2_CONTROL_BYTE    0x1b
 53 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
 54 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
 55 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
 56 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
 57 #define QT2_REC_FLUSH       0x04  /* no following info */
 58 #define QT2_XMIT_FLUSH      0x05  /* no following info */
 59 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
 60 
 61 #define  MAX_BAUD_RATE              921600
 62 #define  DEFAULT_BAUD_RATE          9600
 63 
 64 #define QT2_READ_BUFFER_SIZE    512  /* size of read buffer */
 65 #define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
 66 #define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
 67 
 68 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
 69 
 70 #define USB_VENDOR_ID_QUATECH   0x061d
 71 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
 72 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
 73 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
 74 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
 75 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
 76 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
 77 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
 78 
 79 struct qt2_device_detail {
 80         int product_id;
 81         int num_ports;
 82 };
 83 
 84 #define QT_DETAILS(prod, ports) \
 85         .product_id = (prod),   \
 86         .num_ports = (ports)
 87 
 88 static const struct qt2_device_detail qt2_device_details[] = {
 89         {QT_DETAILS(QUATECH_SSU2_100, 1)},
 90         {QT_DETAILS(QUATECH_DSU2_400, 2)},
 91         {QT_DETAILS(QUATECH_DSU2_100, 2)},
 92         {QT_DETAILS(QUATECH_QSU2_400, 4)},
 93         {QT_DETAILS(QUATECH_QSU2_100, 4)},
 94         {QT_DETAILS(QUATECH_ESU2_400, 8)},
 95         {QT_DETAILS(QUATECH_ESU2_100, 8)},
 96         {QT_DETAILS(0, 0)}      /* Terminating entry */
 97 };
 98 
 99 static const struct usb_device_id id_table[] = {
100         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
101         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
102         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
103         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
104         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
105         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
106         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
107         {}                      /* Terminating entry */
108 };
109 MODULE_DEVICE_TABLE(usb, id_table);
110 
111 struct qt2_serial_private {
112         unsigned char current_port;  /* current port for incoming data */
113 
114         struct urb      *read_urb;   /* shared among all ports */
115         char            *read_buffer;
116 };
117 
118 struct qt2_port_private {
119         u8   device_port;
120 
121         spinlock_t urb_lock;
122         bool       urb_in_use;
123         struct urb *write_urb;
124         char       *write_buffer;
125 
126         spinlock_t  lock;
127         u8          shadowLSR;
128         u8          shadowMSR;
129 
130         struct usb_serial_port *port;
131 };
132 
133 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
134 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
135 static void qt2_write_bulk_callback(struct urb *urb);
136 static void qt2_read_bulk_callback(struct urb *urb);
137 
138 static void qt2_release(struct usb_serial *serial)
139 {
140         struct qt2_serial_private *serial_priv;
141 
142         serial_priv = usb_get_serial_data(serial);
143 
144         usb_free_urb(serial_priv->read_urb);
145         kfree(serial_priv->read_buffer);
146         kfree(serial_priv);
147 }
148 
149 static inline int calc_baud_divisor(int baudrate)
150 {
151         int divisor, rem;
152 
153         divisor = MAX_BAUD_RATE / baudrate;
154         rem = MAX_BAUD_RATE % baudrate;
155         /* Round to nearest divisor */
156         if (((rem * 2) >= baudrate) && (baudrate != 110))
157                 divisor++;
158 
159         return divisor;
160 }
161 
162 static inline int qt2_set_port_config(struct usb_device *dev,
163                                       unsigned char port_number,
164                                       u16 baudrate, u16 lcr)
165 {
166         int divisor = calc_baud_divisor(baudrate);
167         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
168 
169         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
170                                QT2_GET_SET_UART, 0x40,
171                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
172 }
173 
174 static inline int qt2_control_msg(struct usb_device *dev,
175                                   u8 request, u16 data, u16 index)
176 {
177         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
178                                request, 0x40, data, index,
179                                NULL, 0, QT2_USB_TIMEOUT);
180 }
181 
182 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
183 {
184         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
185 
186         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
187 }
188 
189 
190 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
191 {
192         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
193                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
194                                data, 3, QT2_USB_TIMEOUT);
195 }
196 
197 static inline int qt2_getregister(struct usb_device *dev,
198                                   u8 uart,
199                                   u8 reg,
200                                   u8 *data)
201 {
202         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
203                                QT_SET_GET_REGISTER, 0xc0, reg,
204                                uart, data, sizeof(*data), QT2_USB_TIMEOUT);
205 
206 }
207 
208 static inline int qt2_setregister(struct usb_device *dev,
209                                   u8 uart, u8 reg, u16 data)
210 {
211         u16 value = (data << 8) | reg;
212 
213         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
214                                QT_SET_GET_REGISTER, 0x40, value, uart,
215                                NULL, 0, QT2_USB_TIMEOUT);
216 }
217 
218 static inline int update_mctrl(struct qt2_port_private *port_priv,
219                                unsigned int set, unsigned int clear)
220 {
221         struct usb_serial_port *port = port_priv->port;
222         struct usb_device *dev = port->serial->dev;
223         unsigned urb_value;
224         int status;
225 
226         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
227                 dev_dbg(&port->dev,
228                         "update_mctrl - DTR|RTS not being set|cleared\n");
229                 return 0;       /* no change */
230         }
231 
232         clear &= ~set;  /* 'set' takes precedence over 'clear' */
233         urb_value = 0;
234         if (set & TIOCM_DTR)
235                 urb_value |= UART_MCR_DTR;
236         if (set & TIOCM_RTS)
237                 urb_value |= UART_MCR_RTS;
238 
239         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
240                                  urb_value);
241         if (status < 0)
242                 dev_err(&port->dev,
243                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
244                         status);
245         return status;
246 }
247 
248 static int qt2_calc_num_ports(struct usb_serial *serial)
249 {
250         struct qt2_device_detail d;
251         int i;
252 
253         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
254                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
255                         return d.num_ports;
256         }
257 
258         /* we didn't recognize the device */
259         dev_err(&serial->dev->dev,
260                  "don't know the number of ports, assuming 1\n");
261 
262         return 1;
263 }
264 
265 static void qt2_set_termios(struct tty_struct *tty,
266                             struct usb_serial_port *port,
267                             struct ktermios *old_termios)
268 {
269         struct usb_device *dev = port->serial->dev;
270         struct qt2_port_private *port_priv;
271         struct ktermios *termios = &tty->termios;
272         u16 baud;
273         unsigned int cflag = termios->c_cflag;
274         u16 new_lcr = 0;
275         int status;
276 
277         port_priv = usb_get_serial_port_data(port);
278 
279         if (cflag & PARENB) {
280                 if (cflag & PARODD)
281                         new_lcr |= UART_LCR_PARITY;
282                 else
283                         new_lcr |= SERIAL_EVEN_PARITY;
284         }
285 
286         switch (cflag & CSIZE) {
287         case CS5:
288                 new_lcr |= UART_LCR_WLEN5;
289                 break;
290         case CS6:
291                 new_lcr |= UART_LCR_WLEN6;
292                 break;
293         case CS7:
294                 new_lcr |= UART_LCR_WLEN7;
295                 break;
296         default:
297         case CS8:
298                 new_lcr |= UART_LCR_WLEN8;
299                 break;
300         }
301 
302         baud = tty_get_baud_rate(tty);
303         if (!baud)
304                 baud = 9600;
305 
306         status = qt2_set_port_config(dev, port_priv->device_port, baud,
307                                      new_lcr);
308         if (status < 0)
309                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
310                         __func__, status);
311 
312         if (cflag & CRTSCTS)
313                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
314                                          SERIAL_CRTSCTS,
315                                          port_priv->device_port);
316         else
317                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
318                                          0, port_priv->device_port);
319         if (status < 0)
320                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
321                         __func__, status);
322 
323         if (I_IXOFF(tty) || I_IXON(tty)) {
324                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
325 
326                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
327                                          x, port_priv->device_port);
328         } else
329                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
330                                          0, port_priv->device_port);
331 
332         if (status < 0)
333                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
334                         __func__, status);
335 
336 }
337 
338 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
339 {
340         struct usb_serial *serial;
341         struct qt2_port_private *port_priv;
342         u8 *data;
343         u16 device_port;
344         int status;
345         unsigned long flags;
346 
347         device_port = port->port_number;
348 
349         serial = port->serial;
350 
351         port_priv = usb_get_serial_port_data(port);
352 
353         /* set the port to RS232 mode */
354         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
355                                  QT2_QMCR_RS232, device_port);
356         if (status < 0) {
357                 dev_err(&port->dev,
358                         "%s failed to set RS232 mode for port %i error %i\n",
359                         __func__, device_port, status);
360                 return status;
361         }
362 
363         data = kzalloc(2, GFP_KERNEL);
364         if (!data)
365                 return -ENOMEM;
366 
367         /* open the port */
368         status = usb_control_msg(serial->dev,
369                                  usb_rcvctrlpipe(serial->dev, 0),
370                                  QT_OPEN_CLOSE_CHANNEL,
371                                  0xc0, 0,
372                                  device_port, data, 2, QT2_USB_TIMEOUT);
373 
374         if (status < 0) {
375                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
376                         status);
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         unsigned long flags;
411         int i;
412 
413         serial = port->serial;
414         port_priv = usb_get_serial_port_data(port);
415 
416         spin_lock_irqsave(&port_priv->urb_lock, flags);
417         usb_kill_urb(port_priv->write_urb);
418         port_priv->urb_in_use = false;
419         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
420 
421         /* flush the port transmit buffer */
422         i = usb_control_msg(serial->dev,
423                             usb_rcvctrlpipe(serial->dev, 0),
424                             QT2_FLUSH_DEVICE, 0x40, 1,
425                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
426 
427         if (i < 0)
428                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
429                         __func__, i);
430 
431         /* flush the port receive buffer */
432         i = usb_control_msg(serial->dev,
433                             usb_rcvctrlpipe(serial->dev, 0),
434                             QT2_FLUSH_DEVICE, 0x40, 0,
435                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
436 
437         if (i < 0)
438                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
439                         __func__, i);
440 
441         /* close the port */
442         i = usb_control_msg(serial->dev,
443                             usb_sndctrlpipe(serial->dev, 0),
444                             QT_OPEN_CLOSE_CHANNEL,
445                             0x40, 0,
446                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
447 
448         if (i < 0)
449                 dev_err(&port->dev, "%s - close port failed %i\n",
450                         __func__, i);
451 }
452 
453 static void qt2_disconnect(struct usb_serial *serial)
454 {
455         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
456 
457         usb_kill_urb(serial_priv->read_urb);
458 }
459 
460 static int get_serial_info(struct usb_serial_port *port,
461                            struct serial_struct __user *retinfo)
462 {
463         struct serial_struct tmp;
464 
465         if (!retinfo)
466                 return -EFAULT;
467 
468         memset(&tmp, 0, sizeof(tmp));
469         tmp.line                = port->minor;
470         tmp.port                = 0;
471         tmp.irq                 = 0;
472         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
473         tmp.xmit_fifo_size      = port->bulk_out_size;
474         tmp.baud_base           = 9600;
475         tmp.close_delay         = 5*HZ;
476         tmp.closing_wait        = 30*HZ;
477 
478         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
479                 return -EFAULT;
480         return 0;
481 }
482 
483 static int qt2_ioctl(struct tty_struct *tty,
484                      unsigned int cmd, unsigned long arg)
485 {
486         struct usb_serial_port *port = tty->driver_data;
487 
488         switch (cmd) {
489         case TIOCGSERIAL:
490                 return get_serial_info(port,
491                                        (struct serial_struct __user *)arg);
492         default:
493                 break;
494         }
495 
496         return -ENOIOCTLCMD;
497 }
498 
499 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
500 {
501         switch (*ch) {
502         case QT2_LINE_STATUS:
503                 qt2_update_lsr(port, ch + 1);
504                 break;
505         case QT2_MODEM_STATUS:
506                 qt2_update_msr(port, ch + 1);
507                 break;
508         }
509 }
510 
511 /* not needed, kept to document functionality */
512 static void qt2_process_xmit_empty(struct usb_serial_port *port,
513                                    unsigned char *ch)
514 {
515         int bytes_written;
516 
517         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
518 }
519 
520 /* not needed, kept to document functionality */
521 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
522 {
523         return;
524 }
525 
526 static void qt2_process_read_urb(struct urb *urb)
527 {
528         struct usb_serial *serial;
529         struct qt2_serial_private *serial_priv;
530         struct usb_serial_port *port;
531         struct qt2_port_private *port_priv;
532         bool escapeflag;
533         unsigned char *ch;
534         int i;
535         unsigned char newport;
536         int len = urb->actual_length;
537 
538         if (!len)
539                 return;
540 
541         ch = urb->transfer_buffer;
542         serial = urb->context;
543         serial_priv = usb_get_serial_data(serial);
544         port = serial->port[serial_priv->current_port];
545         port_priv = usb_get_serial_port_data(port);
546 
547         for (i = 0; i < urb->actual_length; i++) {
548                 ch = (unsigned char *)urb->transfer_buffer + i;
549                 if ((i <= (len - 3)) &&
550                     (*ch == QT2_CONTROL_BYTE) &&
551                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
552                         escapeflag = false;
553                         switch (*(ch + 2)) {
554                         case QT2_LINE_STATUS:
555                         case QT2_MODEM_STATUS:
556                                 if (i > (len - 4)) {
557                                         dev_warn(&port->dev,
558                                                  "%s - status message too short\n",
559                                                 __func__);
560                                         break;
561                                 }
562                                 qt2_process_status(port, ch + 2);
563                                 i += 3;
564                                 escapeflag = true;
565                                 break;
566                         case QT2_XMIT_HOLD:
567                                 if (i > (len - 5)) {
568                                         dev_warn(&port->dev,
569                                                  "%s - xmit_empty message too short\n",
570                                                  __func__);
571                                         break;
572                                 }
573                                 qt2_process_xmit_empty(port, ch + 3);
574                                 i += 4;
575                                 escapeflag = true;
576                                 break;
577                         case QT2_CHANGE_PORT:
578                                 if (i > (len - 4)) {
579                                         dev_warn(&port->dev,
580                                                  "%s - change_port message too short\n",
581                                                  __func__);
582                                         break;
583                                 }
584                                 tty_flip_buffer_push(&port->port);
585 
586                                 newport = *(ch + 3);
587 
588                                 if (newport > serial->num_ports) {
589                                         dev_err(&port->dev,
590                                                 "%s - port change to invalid port: %i\n",
591                                                 __func__, newport);
592                                         break;
593                                 }
594 
595                                 serial_priv->current_port = newport;
596                                 port = serial->port[serial_priv->current_port];
597                                 port_priv = usb_get_serial_port_data(port);
598                                 i += 3;
599                                 escapeflag = true;
600                                 break;
601                         case QT2_REC_FLUSH:
602                         case QT2_XMIT_FLUSH:
603                                 qt2_process_flush(port, ch + 2);
604                                 i += 2;
605                                 escapeflag = true;
606                                 break;
607                         case QT2_CONTROL_ESCAPE:
608                                 tty_buffer_request_room(&port->port, 2);
609                                 tty_insert_flip_string(&port->port, ch, 2);
610                                 i += 2;
611                                 escapeflag = true;
612                                 break;
613                         default:
614                                 dev_warn(&port->dev,
615                                          "%s - unsupported command %i\n",
616                                          __func__, *(ch + 2));
617                                 break;
618                         }
619                         if (escapeflag)
620                                 continue;
621                 }
622 
623                 tty_buffer_request_room(&port->port, 1);
624                 tty_insert_flip_string(&port->port, ch, 1);
625         }
626 
627         tty_flip_buffer_push(&port->port);
628 }
629 
630 static void qt2_write_bulk_callback(struct urb *urb)
631 {
632         struct usb_serial_port *port;
633         struct qt2_port_private *port_priv;
634 
635         port = urb->context;
636         port_priv = usb_get_serial_port_data(port);
637 
638         spin_lock(&port_priv->urb_lock);
639 
640         port_priv->urb_in_use = false;
641         usb_serial_port_softint(port);
642 
643         spin_unlock(&port_priv->urb_lock);
644 
645 }
646 
647 static void qt2_read_bulk_callback(struct urb *urb)
648 {
649         struct usb_serial *serial = urb->context;
650         int status;
651 
652         if (urb->status) {
653                 dev_warn(&serial->dev->dev,
654                          "%s - non-zero urb status: %i\n", __func__,
655                          urb->status);
656                 return;
657         }
658 
659         qt2_process_read_urb(urb);
660 
661         status = usb_submit_urb(urb, GFP_ATOMIC);
662         if (status != 0)
663                 dev_err(&serial->dev->dev,
664                         "%s - resubmit read urb failed: %i\n",
665                         __func__, status);
666 }
667 
668 static int qt2_setup_urbs(struct usb_serial *serial)
669 {
670         struct usb_serial_port *port0;
671         struct qt2_serial_private *serial_priv;
672         int status;
673 
674         port0 = serial->port[0];
675 
676         serial_priv = usb_get_serial_data(serial);
677         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
678         if (!serial_priv->read_urb)
679                 return -ENOMEM;
680 
681         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
682                           usb_rcvbulkpipe(serial->dev,
683                                           port0->bulk_in_endpointAddress),
684                           serial_priv->read_buffer,
685                           QT2_READ_BUFFER_SIZE,
686                           qt2_read_bulk_callback, serial);
687 
688         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
689         if (status != 0) {
690                 dev_err(&serial->dev->dev,
691                         "%s - submit read urb failed %i\n", __func__, status);
692                 usb_free_urb(serial_priv->read_urb);
693                 return status;
694         }
695 
696         return 0;
697 }
698 
699 static int qt2_attach(struct usb_serial *serial)
700 {
701         struct qt2_serial_private *serial_priv;
702         int status;
703 
704         /* power on unit */
705         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
706                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
707                                  QT2_USB_TIMEOUT);
708         if (status < 0) {
709                 dev_err(&serial->dev->dev,
710                         "%s - failed to power on unit: %i\n", __func__, status);
711                 return status;
712         }
713 
714         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
715         if (!serial_priv)
716                 return -ENOMEM;
717 
718         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
719         if (!serial_priv->read_buffer) {
720                 status = -ENOMEM;
721                 goto err_buf;
722         }
723 
724         usb_set_serial_data(serial, serial_priv);
725 
726         status = qt2_setup_urbs(serial);
727         if (status != 0)
728                 goto attach_failed;
729 
730         return 0;
731 
732 attach_failed:
733         kfree(serial_priv->read_buffer);
734 err_buf:
735         kfree(serial_priv);
736         return status;
737 }
738 
739 static int qt2_port_probe(struct usb_serial_port *port)
740 {
741         struct usb_serial *serial = port->serial;
742         struct qt2_port_private *port_priv;
743         u8 bEndpointAddress;
744 
745         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
746         if (!port_priv)
747                 return -ENOMEM;
748 
749         spin_lock_init(&port_priv->lock);
750         spin_lock_init(&port_priv->urb_lock);
751         port_priv->port = port;
752 
753         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
754         if (!port_priv->write_buffer)
755                 goto err_buf;
756 
757         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
758         if (!port_priv->write_urb)
759                 goto err_urb;
760 
761         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
762         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
763                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
764                                 port_priv->write_buffer,
765                                 QT2_WRITE_BUFFER_SIZE,
766                                 qt2_write_bulk_callback, port);
767 
768         usb_set_serial_port_data(port, port_priv);
769 
770         return 0;
771 err_urb:
772         kfree(port_priv->write_buffer);
773 err_buf:
774         kfree(port_priv);
775         return -ENOMEM;
776 }
777 
778 static int qt2_port_remove(struct usb_serial_port *port)
779 {
780         struct qt2_port_private *port_priv;
781 
782         port_priv = usb_get_serial_port_data(port);
783         usb_free_urb(port_priv->write_urb);
784         kfree(port_priv->write_buffer);
785         kfree(port_priv);
786 
787         return 0;
788 }
789 
790 static int qt2_tiocmget(struct tty_struct *tty)
791 {
792         struct usb_serial_port *port = tty->driver_data;
793         struct usb_device *dev = port->serial->dev;
794         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
795         u8 *d;
796         int r;
797 
798         d = kzalloc(2, GFP_KERNEL);
799         if (!d)
800                 return -ENOMEM;
801 
802         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
803         if (r < 0)
804                 goto mget_out;
805 
806         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
807         if (r < 0)
808                 goto mget_out;
809 
810         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
811             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
812             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
813             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
814             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
815             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
816 
817 mget_out:
818         kfree(d);
819         return r;
820 }
821 
822 static int qt2_tiocmset(struct tty_struct *tty,
823                         unsigned int set, unsigned int clear)
824 {
825         struct qt2_port_private *port_priv;
826 
827         port_priv = usb_get_serial_port_data(tty->driver_data);
828         return update_mctrl(port_priv, set, clear);
829 }
830 
831 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
832 {
833         struct usb_serial_port *port = tty->driver_data;
834         struct qt2_port_private *port_priv;
835         int status;
836         u16 val;
837 
838         port_priv = usb_get_serial_port_data(port);
839 
840         val = (break_state == -1) ? 1 : 0;
841 
842         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
843                                  val, port_priv->device_port);
844         if (status < 0)
845                 dev_warn(&port->dev,
846                          "%s - failed to send control message: %i\n", __func__,
847                          status);
848 }
849 
850 
851 
852 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
853 {
854         struct usb_device *dev = port->serial->dev;
855         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
856 
857         /* Disable flow control */
858         if (!on) {
859                 if (qt2_setregister(dev, port_priv->device_port,
860                                            UART_MCR, 0) < 0)
861                         dev_warn(&port->dev, "error from flowcontrol urb\n");
862         }
863         /* drop RTS and DTR */
864         if (on)
865                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
866         else
867                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
868 }
869 
870 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
871 {
872         struct qt2_port_private *port_priv;
873         u8 newMSR = (u8) *ch;
874         unsigned long flags;
875 
876         port_priv = usb_get_serial_port_data(port);
877 
878         spin_lock_irqsave(&port_priv->lock, flags);
879         port_priv->shadowMSR = newMSR;
880         spin_unlock_irqrestore(&port_priv->lock, flags);
881 
882         if (newMSR & UART_MSR_ANY_DELTA) {
883                 /* update input line counters */
884                 if (newMSR & UART_MSR_DCTS)
885                         port->icount.cts++;
886                 if (newMSR & UART_MSR_DDSR)
887                         port->icount.dsr++;
888                 if (newMSR & UART_MSR_DDCD)
889                         port->icount.dcd++;
890                 if (newMSR & UART_MSR_TERI)
891                         port->icount.rng++;
892 
893                 wake_up_interruptible(&port->port.delta_msr_wait);
894         }
895 }
896 
897 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
898 {
899         struct qt2_port_private *port_priv;
900         struct async_icount *icount;
901         unsigned long flags;
902         u8 newLSR = (u8) *ch;
903 
904         port_priv = usb_get_serial_port_data(port);
905 
906         if (newLSR & UART_LSR_BI)
907                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
908 
909         spin_lock_irqsave(&port_priv->lock, flags);
910         port_priv->shadowLSR = newLSR;
911         spin_unlock_irqrestore(&port_priv->lock, flags);
912 
913         icount = &port->icount;
914 
915         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
916 
917                 if (newLSR & UART_LSR_BI)
918                         icount->brk++;
919 
920                 if (newLSR & UART_LSR_OE)
921                         icount->overrun++;
922 
923                 if (newLSR & UART_LSR_PE)
924                         icount->parity++;
925 
926                 if (newLSR & UART_LSR_FE)
927                         icount->frame++;
928         }
929 
930 }
931 
932 static int qt2_write_room(struct tty_struct *tty)
933 {
934         struct usb_serial_port *port = tty->driver_data;
935         struct qt2_port_private *port_priv;
936         unsigned long flags = 0;
937         int r;
938 
939         port_priv = usb_get_serial_port_data(port);
940 
941         spin_lock_irqsave(&port_priv->urb_lock, flags);
942 
943         if (port_priv->urb_in_use)
944                 r = 0;
945         else
946                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
947 
948         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
949 
950         return r;
951 }
952 
953 static int qt2_write(struct tty_struct *tty,
954                      struct usb_serial_port *port,
955                      const unsigned char *buf, int count)
956 {
957         struct qt2_port_private *port_priv;
958         struct urb *write_urb;
959         unsigned char *data;
960         unsigned long flags;
961         int status;
962         int bytes_out = 0;
963 
964         port_priv = usb_get_serial_port_data(port);
965 
966         if (port_priv->write_urb == NULL) {
967                 dev_err(&port->dev, "%s - no output urb\n", __func__);
968                 return 0;
969         }
970         write_urb = port_priv->write_urb;
971 
972         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
973 
974         data = write_urb->transfer_buffer;
975         spin_lock_irqsave(&port_priv->urb_lock, flags);
976         if (port_priv->urb_in_use == true) {
977                 dev_err(&port->dev, "qt2_write - urb is in use\n");
978                 goto write_out;
979         }
980 
981         *data++ = QT2_CONTROL_BYTE;
982         *data++ = QT2_CONTROL_BYTE;
983         *data++ = port_priv->device_port;
984         put_unaligned_le16(count, data);
985         data += 2;
986         memcpy(data, buf, count);
987 
988         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
989 
990         status = usb_submit_urb(write_urb, GFP_ATOMIC);
991         if (status == 0) {
992                 port_priv->urb_in_use = true;
993                 bytes_out += count;
994         }
995 
996 write_out:
997         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
998         return bytes_out;
999 }
1000 
1001 
1002 static struct usb_serial_driver qt2_device = {
1003         .driver = {
1004                 .owner = THIS_MODULE,
1005                 .name = "quatech-serial",
1006         },
1007         .description         = DRIVER_DESC,
1008         .id_table            = id_table,
1009         .open                = qt2_open,
1010         .close               = qt2_close,
1011         .write               = qt2_write,
1012         .write_room          = qt2_write_room,
1013         .calc_num_ports      = qt2_calc_num_ports,
1014         .attach              = qt2_attach,
1015         .release             = qt2_release,
1016         .disconnect          = qt2_disconnect,
1017         .port_probe          = qt2_port_probe,
1018         .port_remove         = qt2_port_remove,
1019         .dtr_rts             = qt2_dtr_rts,
1020         .break_ctl           = qt2_break_ctl,
1021         .tiocmget            = qt2_tiocmget,
1022         .tiocmset            = qt2_tiocmset,
1023         .tiocmiwait          = usb_serial_generic_tiocmiwait,
1024         .get_icount          = usb_serial_generic_get_icount,
1025         .ioctl               = qt2_ioctl,
1026         .set_termios         = qt2_set_termios,
1027 };
1028 
1029 static struct usb_serial_driver *const serial_drivers[] = {
1030         &qt2_device, NULL
1031 };
1032 
1033 module_usb_serial_driver(serial_drivers, id_table);
1034 
1035 MODULE_DESCRIPTION(DRIVER_DESC);
1036 MODULE_LICENSE("GPL");
1037 

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