Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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_kill_urb(serial_priv->read_urb);
145         usb_free_urb(serial_priv->read_urb);
146         kfree(serial_priv->read_buffer);
147         kfree(serial_priv);
148 }
149 
150 static inline int calc_baud_divisor(int baudrate)
151 {
152         int divisor, rem;
153 
154         divisor = MAX_BAUD_RATE / baudrate;
155         rem = MAX_BAUD_RATE % baudrate;
156         /* Round to nearest divisor */
157         if (((rem * 2) >= baudrate) && (baudrate != 110))
158                 divisor++;
159 
160         return divisor;
161 }
162 
163 static inline int qt2_set_port_config(struct usb_device *dev,
164                                       unsigned char port_number,
165                                       u16 baudrate, u16 lcr)
166 {
167         int divisor = calc_baud_divisor(baudrate);
168         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
169 
170         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
171                                QT2_GET_SET_UART, 0x40,
172                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
173 }
174 
175 static inline int qt2_control_msg(struct usb_device *dev,
176                                   u8 request, u16 data, u16 index)
177 {
178         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
179                                request, 0x40, data, index,
180                                NULL, 0, QT2_USB_TIMEOUT);
181 }
182 
183 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
184 {
185         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
186 
187         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
188 }
189 
190 
191 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
192 {
193         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
194                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
195                                data, 3, QT2_USB_TIMEOUT);
196 }
197 
198 static inline int qt2_getregister(struct usb_device *dev,
199                                   u8 uart,
200                                   u8 reg,
201                                   u8 *data)
202 {
203         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
204                                QT_SET_GET_REGISTER, 0xc0, reg,
205                                uart, data, sizeof(*data), QT2_USB_TIMEOUT);
206 
207 }
208 
209 static inline int qt2_setregister(struct usb_device *dev,
210                                   u8 uart, u8 reg, u16 data)
211 {
212         u16 value = (data << 8) | reg;
213 
214         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
215                                QT_SET_GET_REGISTER, 0x40, value, uart,
216                                NULL, 0, QT2_USB_TIMEOUT);
217 }
218 
219 static inline int update_mctrl(struct qt2_port_private *port_priv,
220                                unsigned int set, unsigned int clear)
221 {
222         struct usb_serial_port *port = port_priv->port;
223         struct usb_device *dev = port->serial->dev;
224         unsigned urb_value;
225         int status;
226 
227         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
228                 dev_dbg(&port->dev,
229                         "update_mctrl - DTR|RTS not being set|cleared\n");
230                 return 0;       /* no change */
231         }
232 
233         clear &= ~set;  /* 'set' takes precedence over 'clear' */
234         urb_value = 0;
235         if (set & TIOCM_DTR)
236                 urb_value |= UART_MCR_DTR;
237         if (set & TIOCM_RTS)
238                 urb_value |= UART_MCR_RTS;
239 
240         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
241                                  urb_value);
242         if (status < 0)
243                 dev_err(&port->dev,
244                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
245                         status);
246         return status;
247 }
248 
249 static int qt2_calc_num_ports(struct usb_serial *serial)
250 {
251         struct qt2_device_detail d;
252         int i;
253 
254         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
255                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
256                         return d.num_ports;
257         }
258 
259         /* we didn't recognize the device */
260         dev_err(&serial->dev->dev,
261                  "don't know the number of ports, assuming 1\n");
262 
263         return 1;
264 }
265 
266 static void qt2_set_termios(struct tty_struct *tty,
267                             struct usb_serial_port *port,
268                             struct ktermios *old_termios)
269 {
270         struct usb_device *dev = port->serial->dev;
271         struct qt2_port_private *port_priv;
272         struct ktermios *termios = &tty->termios;
273         u16 baud;
274         unsigned int cflag = termios->c_cflag;
275         u16 new_lcr = 0;
276         int status;
277 
278         port_priv = usb_get_serial_port_data(port);
279 
280         if (cflag & PARENB) {
281                 if (cflag & PARODD)
282                         new_lcr |= UART_LCR_PARITY;
283                 else
284                         new_lcr |= SERIAL_EVEN_PARITY;
285         }
286 
287         switch (cflag & CSIZE) {
288         case CS5:
289                 new_lcr |= UART_LCR_WLEN5;
290                 break;
291         case CS6:
292                 new_lcr |= UART_LCR_WLEN6;
293                 break;
294         case CS7:
295                 new_lcr |= UART_LCR_WLEN7;
296                 break;
297         default:
298         case CS8:
299                 new_lcr |= UART_LCR_WLEN8;
300                 break;
301         }
302 
303         baud = tty_get_baud_rate(tty);
304         if (!baud)
305                 baud = 9600;
306 
307         status = qt2_set_port_config(dev, port_priv->device_port, baud,
308                                      new_lcr);
309         if (status < 0)
310                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
311                         __func__, status);
312 
313         if (cflag & CRTSCTS)
314                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
315                                          SERIAL_CRTSCTS,
316                                          port_priv->device_port);
317         else
318                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
319                                          0, port_priv->device_port);
320         if (status < 0)
321                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
322                         __func__, status);
323 
324         if (I_IXOFF(tty) || I_IXON(tty)) {
325                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
326 
327                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
328                                          x, port_priv->device_port);
329         } else
330                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
331                                          0, port_priv->device_port);
332 
333         if (status < 0)
334                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
335                         __func__, status);
336 
337 }
338 
339 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
340 {
341         struct usb_serial *serial;
342         struct qt2_port_private *port_priv;
343         u8 *data;
344         u16 device_port;
345         int status;
346         unsigned long flags;
347 
348         device_port = port->port_number;
349 
350         serial = port->serial;
351 
352         port_priv = usb_get_serial_port_data(port);
353 
354         /* set the port to RS232 mode */
355         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
356                                  QT2_QMCR_RS232, device_port);
357         if (status < 0) {
358                 dev_err(&port->dev,
359                         "%s failed to set RS232 mode for port %i error %i\n",
360                         __func__, device_port, status);
361                 return status;
362         }
363 
364         data = kzalloc(2, GFP_KERNEL);
365         if (!data)
366                 return -ENOMEM;
367 
368         /* open the port */
369         status = usb_control_msg(serial->dev,
370                                  usb_rcvctrlpipe(serial->dev, 0),
371                                  QT_OPEN_CLOSE_CHANNEL,
372                                  0xc0, 0,
373                                  device_port, data, 2, QT2_USB_TIMEOUT);
374 
375         if (status < 0) {
376                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
377                         status);
378                 kfree(data);
379                 return status;
380         }
381 
382         spin_lock_irqsave(&port_priv->lock, flags);
383         port_priv->shadowLSR = data[0];
384         port_priv->shadowMSR = data[1];
385         spin_unlock_irqrestore(&port_priv->lock, flags);
386 
387         kfree(data);
388 
389         /* set to default speed and 8bit word size */
390         status = qt2_set_port_config(serial->dev, device_port,
391                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
392         if (status < 0) {
393                 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
394                         __func__, device_port);
395                 return status;
396         }
397 
398         port_priv->device_port = (u8) device_port;
399 
400         if (tty)
401                 qt2_set_termios(tty, port, &tty->termios);
402 
403         return 0;
404 
405 }
406 
407 static void qt2_close(struct usb_serial_port *port)
408 {
409         struct usb_serial *serial;
410         struct qt2_port_private *port_priv;
411         unsigned long flags;
412         int i;
413 
414         serial = port->serial;
415         port_priv = usb_get_serial_port_data(port);
416 
417         spin_lock_irqsave(&port_priv->urb_lock, flags);
418         usb_kill_urb(port_priv->write_urb);
419         port_priv->urb_in_use = false;
420         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
421 
422         /* flush the port transmit buffer */
423         i = usb_control_msg(serial->dev,
424                             usb_rcvctrlpipe(serial->dev, 0),
425                             QT2_FLUSH_DEVICE, 0x40, 1,
426                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
427 
428         if (i < 0)
429                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
430                         __func__, i);
431 
432         /* flush the port receive buffer */
433         i = usb_control_msg(serial->dev,
434                             usb_rcvctrlpipe(serial->dev, 0),
435                             QT2_FLUSH_DEVICE, 0x40, 0,
436                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
437 
438         if (i < 0)
439                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
440                         __func__, i);
441 
442         /* close the port */
443         i = usb_control_msg(serial->dev,
444                             usb_sndctrlpipe(serial->dev, 0),
445                             QT_OPEN_CLOSE_CHANNEL,
446                             0x40, 0,
447                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
448 
449         if (i < 0)
450                 dev_err(&port->dev, "%s - close port failed %i\n",
451                         __func__, i);
452 }
453 
454 static void qt2_disconnect(struct usb_serial *serial)
455 {
456         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
457 
458         usb_kill_urb(serial_priv->read_urb);
459 }
460 
461 static int get_serial_info(struct usb_serial_port *port,
462                            struct serial_struct __user *retinfo)
463 {
464         struct serial_struct tmp;
465 
466         if (!retinfo)
467                 return -EFAULT;
468 
469         memset(&tmp, 0, sizeof(tmp));
470         tmp.line                = port->minor;
471         tmp.port                = 0;
472         tmp.irq                 = 0;
473         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
474         tmp.xmit_fifo_size      = port->bulk_out_size;
475         tmp.baud_base           = 9600;
476         tmp.close_delay         = 5*HZ;
477         tmp.closing_wait        = 30*HZ;
478 
479         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
480                 return -EFAULT;
481         return 0;
482 }
483 
484 static int qt2_ioctl(struct tty_struct *tty,
485                      unsigned int cmd, unsigned long arg)
486 {
487         struct usb_serial_port *port = tty->driver_data;
488 
489         switch (cmd) {
490         case TIOCGSERIAL:
491                 return get_serial_info(port,
492                                        (struct serial_struct __user *)arg);
493         default:
494                 break;
495         }
496 
497         return -ENOIOCTLCMD;
498 }
499 
500 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
501 {
502         switch (*ch) {
503         case QT2_LINE_STATUS:
504                 qt2_update_lsr(port, ch + 1);
505                 break;
506         case QT2_MODEM_STATUS:
507                 qt2_update_msr(port, ch + 1);
508                 break;
509         }
510 }
511 
512 /* not needed, kept to document functionality */
513 static void qt2_process_xmit_empty(struct usb_serial_port *port,
514                                    unsigned char *ch)
515 {
516         int bytes_written;
517 
518         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
519 }
520 
521 /* not needed, kept to document functionality */
522 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
523 {
524         return;
525 }
526 
527 static void qt2_process_read_urb(struct urb *urb)
528 {
529         struct usb_serial *serial;
530         struct qt2_serial_private *serial_priv;
531         struct usb_serial_port *port;
532         struct qt2_port_private *port_priv;
533         bool escapeflag;
534         unsigned char *ch;
535         int i;
536         unsigned char newport;
537         int len = urb->actual_length;
538 
539         if (!len)
540                 return;
541 
542         ch = urb->transfer_buffer;
543         serial = urb->context;
544         serial_priv = usb_get_serial_data(serial);
545         port = serial->port[serial_priv->current_port];
546         port_priv = usb_get_serial_port_data(port);
547 
548         for (i = 0; i < urb->actual_length; i++) {
549                 ch = (unsigned char *)urb->transfer_buffer + i;
550                 if ((i <= (len - 3)) &&
551                     (*ch == QT2_CONTROL_BYTE) &&
552                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
553                         escapeflag = false;
554                         switch (*(ch + 2)) {
555                         case QT2_LINE_STATUS:
556                         case QT2_MODEM_STATUS:
557                                 if (i > (len - 4)) {
558                                         dev_warn(&port->dev,
559                                                  "%s - status message too short\n",
560                                                 __func__);
561                                         break;
562                                 }
563                                 qt2_process_status(port, ch + 2);
564                                 i += 3;
565                                 escapeflag = true;
566                                 break;
567                         case QT2_XMIT_HOLD:
568                                 if (i > (len - 5)) {
569                                         dev_warn(&port->dev,
570                                                  "%s - xmit_empty message too short\n",
571                                                  __func__);
572                                         break;
573                                 }
574                                 qt2_process_xmit_empty(port, ch + 3);
575                                 i += 4;
576                                 escapeflag = true;
577                                 break;
578                         case QT2_CHANGE_PORT:
579                                 if (i > (len - 4)) {
580                                         dev_warn(&port->dev,
581                                                  "%s - change_port message too short\n",
582                                                  __func__);
583                                         break;
584                                 }
585                                 tty_flip_buffer_push(&port->port);
586 
587                                 newport = *(ch + 3);
588 
589                                 if (newport > serial->num_ports) {
590                                         dev_err(&port->dev,
591                                                 "%s - port change to invalid port: %i\n",
592                                                 __func__, newport);
593                                         break;
594                                 }
595 
596                                 serial_priv->current_port = newport;
597                                 port = serial->port[serial_priv->current_port];
598                                 port_priv = usb_get_serial_port_data(port);
599                                 i += 3;
600                                 escapeflag = true;
601                                 break;
602                         case QT2_REC_FLUSH:
603                         case QT2_XMIT_FLUSH:
604                                 qt2_process_flush(port, ch + 2);
605                                 i += 2;
606                                 escapeflag = true;
607                                 break;
608                         case QT2_CONTROL_ESCAPE:
609                                 tty_buffer_request_room(&port->port, 2);
610                                 tty_insert_flip_string(&port->port, ch, 2);
611                                 i += 2;
612                                 escapeflag = true;
613                                 break;
614                         default:
615                                 dev_warn(&port->dev,
616                                          "%s - unsupported command %i\n",
617                                          __func__, *(ch + 2));
618                                 break;
619                         }
620                         if (escapeflag)
621                                 continue;
622                 }
623 
624                 tty_buffer_request_room(&port->port, 1);
625                 tty_insert_flip_string(&port->port, ch, 1);
626         }
627 
628         tty_flip_buffer_push(&port->port);
629 }
630 
631 static void qt2_write_bulk_callback(struct urb *urb)
632 {
633         struct usb_serial_port *port;
634         struct qt2_port_private *port_priv;
635 
636         port = urb->context;
637         port_priv = usb_get_serial_port_data(port);
638 
639         spin_lock(&port_priv->urb_lock);
640 
641         port_priv->urb_in_use = false;
642         usb_serial_port_softint(port);
643 
644         spin_unlock(&port_priv->urb_lock);
645 
646 }
647 
648 static void qt2_read_bulk_callback(struct urb *urb)
649 {
650         struct usb_serial *serial = urb->context;
651         int status;
652 
653         if (urb->status) {
654                 dev_warn(&serial->dev->dev,
655                          "%s - non-zero urb status: %i\n", __func__,
656                          urb->status);
657                 return;
658         }
659 
660         qt2_process_read_urb(urb);
661 
662         status = usb_submit_urb(urb, GFP_ATOMIC);
663         if (status != 0)
664                 dev_err(&serial->dev->dev,
665                         "%s - resubmit read urb failed: %i\n",
666                         __func__, status);
667 }
668 
669 static int qt2_setup_urbs(struct usb_serial *serial)
670 {
671         struct usb_serial_port *port0;
672         struct qt2_serial_private *serial_priv;
673         int status;
674 
675         port0 = serial->port[0];
676 
677         serial_priv = usb_get_serial_data(serial);
678         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
679         if (!serial_priv->read_urb)
680                 return -ENOMEM;
681 
682         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
683                           usb_rcvbulkpipe(serial->dev,
684                                           port0->bulk_in_endpointAddress),
685                           serial_priv->read_buffer,
686                           QT2_READ_BUFFER_SIZE,
687                           qt2_read_bulk_callback, serial);
688 
689         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
690         if (status != 0) {
691                 dev_err(&serial->dev->dev,
692                         "%s - submit read urb failed %i\n", __func__, status);
693                 usb_free_urb(serial_priv->read_urb);
694                 return status;
695         }
696 
697         return 0;
698 }
699 
700 static int qt2_attach(struct usb_serial *serial)
701 {
702         struct qt2_serial_private *serial_priv;
703         int status;
704 
705         /* power on unit */
706         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
707                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
708                                  QT2_USB_TIMEOUT);
709         if (status < 0) {
710                 dev_err(&serial->dev->dev,
711                         "%s - failed to power on unit: %i\n", __func__, status);
712                 return status;
713         }
714 
715         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
716         if (!serial_priv)
717                 return -ENOMEM;
718 
719         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
720         if (!serial_priv->read_buffer) {
721                 status = -ENOMEM;
722                 goto err_buf;
723         }
724 
725         usb_set_serial_data(serial, serial_priv);
726 
727         status = qt2_setup_urbs(serial);
728         if (status != 0)
729                 goto attach_failed;
730 
731         return 0;
732 
733 attach_failed:
734         kfree(serial_priv->read_buffer);
735 err_buf:
736         kfree(serial_priv);
737         return status;
738 }
739 
740 static int qt2_port_probe(struct usb_serial_port *port)
741 {
742         struct usb_serial *serial = port->serial;
743         struct qt2_port_private *port_priv;
744         u8 bEndpointAddress;
745 
746         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
747         if (!port_priv)
748                 return -ENOMEM;
749 
750         spin_lock_init(&port_priv->lock);
751         spin_lock_init(&port_priv->urb_lock);
752         port_priv->port = port;
753 
754         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
755         if (!port_priv->write_buffer)
756                 goto err_buf;
757 
758         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
759         if (!port_priv->write_urb)
760                 goto err_urb;
761 
762         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
763         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
764                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
765                                 port_priv->write_buffer,
766                                 QT2_WRITE_BUFFER_SIZE,
767                                 qt2_write_bulk_callback, port);
768 
769         usb_set_serial_port_data(port, port_priv);
770 
771         return 0;
772 err_urb:
773         kfree(port_priv->write_buffer);
774 err_buf:
775         kfree(port_priv);
776         return -ENOMEM;
777 }
778 
779 static int qt2_port_remove(struct usb_serial_port *port)
780 {
781         struct qt2_port_private *port_priv;
782 
783         port_priv = usb_get_serial_port_data(port);
784         usb_free_urb(port_priv->write_urb);
785         kfree(port_priv->write_buffer);
786         kfree(port_priv);
787 
788         return 0;
789 }
790 
791 static int qt2_tiocmget(struct tty_struct *tty)
792 {
793         struct usb_serial_port *port = tty->driver_data;
794         struct usb_device *dev = port->serial->dev;
795         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
796         u8 *d;
797         int r;
798 
799         d = kzalloc(2, GFP_KERNEL);
800         if (!d)
801                 return -ENOMEM;
802 
803         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
804         if (r < 0)
805                 goto mget_out;
806 
807         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
808         if (r < 0)
809                 goto mget_out;
810 
811         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
812             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
813             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
814             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
815             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
816             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
817 
818 mget_out:
819         kfree(d);
820         return r;
821 }
822 
823 static int qt2_tiocmset(struct tty_struct *tty,
824                         unsigned int set, unsigned int clear)
825 {
826         struct qt2_port_private *port_priv;
827 
828         port_priv = usb_get_serial_port_data(tty->driver_data);
829         return update_mctrl(port_priv, set, clear);
830 }
831 
832 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
833 {
834         struct usb_serial_port *port = tty->driver_data;
835         struct qt2_port_private *port_priv;
836         int status;
837         u16 val;
838 
839         port_priv = usb_get_serial_port_data(port);
840 
841         val = (break_state == -1) ? 1 : 0;
842 
843         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
844                                  val, port_priv->device_port);
845         if (status < 0)
846                 dev_warn(&port->dev,
847                          "%s - failed to send control message: %i\n", __func__,
848                          status);
849 }
850 
851 
852 
853 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
854 {
855         struct usb_device *dev = port->serial->dev;
856         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
857 
858         /* Disable flow control */
859         if (!on) {
860                 if (qt2_setregister(dev, port_priv->device_port,
861                                            UART_MCR, 0) < 0)
862                         dev_warn(&port->dev, "error from flowcontrol urb\n");
863         }
864         /* drop RTS and DTR */
865         if (on)
866                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
867         else
868                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
869 }
870 
871 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
872 {
873         struct qt2_port_private *port_priv;
874         u8 newMSR = (u8) *ch;
875         unsigned long flags;
876 
877         port_priv = usb_get_serial_port_data(port);
878 
879         spin_lock_irqsave(&port_priv->lock, flags);
880         port_priv->shadowMSR = newMSR;
881         spin_unlock_irqrestore(&port_priv->lock, flags);
882 
883         if (newMSR & UART_MSR_ANY_DELTA) {
884                 /* update input line counters */
885                 if (newMSR & UART_MSR_DCTS)
886                         port->icount.cts++;
887                 if (newMSR & UART_MSR_DDSR)
888                         port->icount.dsr++;
889                 if (newMSR & UART_MSR_DDCD)
890                         port->icount.dcd++;
891                 if (newMSR & UART_MSR_TERI)
892                         port->icount.rng++;
893 
894                 wake_up_interruptible(&port->port.delta_msr_wait);
895         }
896 }
897 
898 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
899 {
900         struct qt2_port_private *port_priv;
901         struct async_icount *icount;
902         unsigned long flags;
903         u8 newLSR = (u8) *ch;
904 
905         port_priv = usb_get_serial_port_data(port);
906 
907         if (newLSR & UART_LSR_BI)
908                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
909 
910         spin_lock_irqsave(&port_priv->lock, flags);
911         port_priv->shadowLSR = newLSR;
912         spin_unlock_irqrestore(&port_priv->lock, flags);
913 
914         icount = &port->icount;
915 
916         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
917 
918                 if (newLSR & UART_LSR_BI)
919                         icount->brk++;
920 
921                 if (newLSR & UART_LSR_OE)
922                         icount->overrun++;
923 
924                 if (newLSR & UART_LSR_PE)
925                         icount->parity++;
926 
927                 if (newLSR & UART_LSR_FE)
928                         icount->frame++;
929         }
930 
931 }
932 
933 static int qt2_write_room(struct tty_struct *tty)
934 {
935         struct usb_serial_port *port = tty->driver_data;
936         struct qt2_port_private *port_priv;
937         unsigned long flags = 0;
938         int r;
939 
940         port_priv = usb_get_serial_port_data(port);
941 
942         spin_lock_irqsave(&port_priv->urb_lock, flags);
943 
944         if (port_priv->urb_in_use)
945                 r = 0;
946         else
947                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
948 
949         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
950 
951         return r;
952 }
953 
954 static int qt2_write(struct tty_struct *tty,
955                      struct usb_serial_port *port,
956                      const unsigned char *buf, int count)
957 {
958         struct qt2_port_private *port_priv;
959         struct urb *write_urb;
960         unsigned char *data;
961         unsigned long flags;
962         int status;
963         int bytes_out = 0;
964 
965         port_priv = usb_get_serial_port_data(port);
966 
967         if (port_priv->write_urb == NULL) {
968                 dev_err(&port->dev, "%s - no output urb\n", __func__);
969                 return 0;
970         }
971         write_urb = port_priv->write_urb;
972 
973         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
974 
975         data = write_urb->transfer_buffer;
976         spin_lock_irqsave(&port_priv->urb_lock, flags);
977         if (port_priv->urb_in_use) {
978                 dev_err(&port->dev, "qt2_write - urb is in use\n");
979                 goto write_out;
980         }
981 
982         *data++ = QT2_CONTROL_BYTE;
983         *data++ = QT2_CONTROL_BYTE;
984         *data++ = port_priv->device_port;
985         put_unaligned_le16(count, data);
986         data += 2;
987         memcpy(data, buf, count);
988 
989         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
990 
991         status = usb_submit_urb(write_urb, GFP_ATOMIC);
992         if (status == 0) {
993                 port_priv->urb_in_use = true;
994                 bytes_out += count;
995         }
996 
997 write_out:
998         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
999         return bytes_out;
1000 }
1001 
1002 
1003 static struct usb_serial_driver qt2_device = {
1004         .driver = {
1005                 .owner = THIS_MODULE,
1006                 .name = "quatech-serial",
1007         },
1008         .description         = DRIVER_DESC,
1009         .id_table            = id_table,
1010         .open                = qt2_open,
1011         .close               = qt2_close,
1012         .write               = qt2_write,
1013         .write_room          = qt2_write_room,
1014         .calc_num_ports      = qt2_calc_num_ports,
1015         .attach              = qt2_attach,
1016         .release             = qt2_release,
1017         .disconnect          = qt2_disconnect,
1018         .port_probe          = qt2_port_probe,
1019         .port_remove         = qt2_port_remove,
1020         .dtr_rts             = qt2_dtr_rts,
1021         .break_ctl           = qt2_break_ctl,
1022         .tiocmget            = qt2_tiocmget,
1023         .tiocmset            = qt2_tiocmset,
1024         .tiocmiwait          = usb_serial_generic_tiocmiwait,
1025         .get_icount          = usb_serial_generic_get_icount,
1026         .ioctl               = qt2_ioctl,
1027         .set_termios         = qt2_set_termios,
1028 };
1029 
1030 static struct usb_serial_driver *const serial_drivers[] = {
1031         &qt2_device, NULL
1032 };
1033 
1034 module_usb_serial_driver(serial_drivers, id_table);
1035 
1036 MODULE_DESCRIPTION(DRIVER_DESC);
1037 MODULE_LICENSE("GPL");
1038 

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