USB: serial/kobil_sct, fix potential tty NULL dereference
[linux-2.6.git] / drivers / usb / serial / kobil_sct.c
1 /*
2  *  KOBIL USB Smart Card Terminal Driver
3  *
4  *  Copyright (C) 2002  KOBIL Systems GmbH
5  *  Author: Thomas Wahrenbruch
6  *
7  *  Contact: linuxusb@kobil.de
8  *
9  *  This program is largely derived from work by the linux-usb group
10  *  and associated source files.  Please see the usb/serial files for
11  *  individual credits and copyrights.
12  *
13  *  This program is free software; you can redistribute it and/or modify
14  *  it under the terms of the GNU General Public License as published by
15  *  the Free Software Foundation; either version 2 of the License, or
16  *  (at your option) any later version.
17  *
18  *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
19  *  patience.
20  *
21  * Supported readers: USB TWIN, KAAN Standard Plus and SecOVID Reader Plus
22  * (Adapter K), B1 Professional and KAAN Professional (Adapter B)
23  *
24  * (21/05/2004) tw
25  *      Fix bug with P'n'P readers
26  *
27  * (28/05/2003) tw
28  *      Add support for KAAN SIM
29  *
30  * (12/09/2002) tw
31  *      Adapted to 2.5.
32  *
33  * (11/08/2002) tw
34  *      Initial version.
35  */
36
37
38 #include <linux/kernel.h>
39 #include <linux/errno.h>
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/tty.h>
43 #include <linux/tty_driver.h>
44 #include <linux/tty_flip.h>
45 #include <linux/module.h>
46 #include <linux/spinlock.h>
47 #include <linux/uaccess.h>
48 #include <linux/usb.h>
49 #include <linux/usb/serial.h>
50 #include <linux/ioctl.h>
51 #include "kobil_sct.h"
52
53 static int debug;
54
55 /* Version Information */
56 #define DRIVER_VERSION "21/05/2004"
57 #define DRIVER_AUTHOR "KOBIL Systems GmbH - http://www.kobil.com"
58 #define DRIVER_DESC "KOBIL USB Smart Card Terminal Driver (experimental)"
59
60 #define KOBIL_VENDOR_ID                 0x0D46
61 #define KOBIL_ADAPTER_B_PRODUCT_ID      0x2011
62 #define KOBIL_ADAPTER_K_PRODUCT_ID      0x2012
63 #define KOBIL_USBTWIN_PRODUCT_ID        0x0078
64 #define KOBIL_KAAN_SIM_PRODUCT_ID       0x0081
65
66 #define KOBIL_TIMEOUT           500
67 #define KOBIL_BUF_LENGTH        300
68
69
70 /* Function prototypes */
71 static int  kobil_startup(struct usb_serial *serial);
72 static void kobil_release(struct usb_serial *serial);
73 static int  kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
74 static void kobil_close(struct usb_serial_port *port);
75 static int  kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
76                          const unsigned char *buf, int count);
77 static int  kobil_write_room(struct tty_struct *tty);
78 static int  kobil_ioctl(struct tty_struct *tty, struct file *file,
79                         unsigned int cmd, unsigned long arg);
80 static int  kobil_tiocmget(struct tty_struct *tty, struct file *file);
81 static int  kobil_tiocmset(struct tty_struct *tty, struct file *file,
82                            unsigned int set, unsigned int clear);
83 static void kobil_read_int_callback(struct urb *urb);
84 static void kobil_write_callback(struct urb *purb);
85 static void kobil_set_termios(struct tty_struct *tty,
86                         struct usb_serial_port *port, struct ktermios *old);
87 static void kobil_init_termios(struct tty_struct *tty);
88
89 static const struct usb_device_id id_table[] = {
90         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_B_PRODUCT_ID) },
91         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_K_PRODUCT_ID) },
92         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_USBTWIN_PRODUCT_ID) },
93         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_KAAN_SIM_PRODUCT_ID) },
94         { }                     /* Terminating entry */
95 };
96
97
98 MODULE_DEVICE_TABLE(usb, id_table);
99
100 static struct usb_driver kobil_driver = {
101         .name =         "kobil",
102         .probe =        usb_serial_probe,
103         .disconnect =   usb_serial_disconnect,
104         .id_table =     id_table,
105         .no_dynamic_id =        1,
106 };
107
108
109 static struct usb_serial_driver kobil_device = {
110         .driver = {
111                 .owner =        THIS_MODULE,
112                 .name =         "kobil",
113         },
114         .description =          "KOBIL USB smart card terminal",
115         .usb_driver =           &kobil_driver,
116         .id_table =             id_table,
117         .num_ports =            1,
118         .attach =               kobil_startup,
119         .release =              kobil_release,
120         .ioctl =                kobil_ioctl,
121         .set_termios =          kobil_set_termios,
122         .init_termios =         kobil_init_termios,
123         .tiocmget =             kobil_tiocmget,
124         .tiocmset =             kobil_tiocmset,
125         .open =                 kobil_open,
126         .close =                kobil_close,
127         .write =                kobil_write,
128         .write_room =           kobil_write_room,
129         .read_int_callback =    kobil_read_int_callback,
130 };
131
132
133 struct kobil_private {
134         int write_int_endpoint_address;
135         int read_int_endpoint_address;
136         unsigned char buf[KOBIL_BUF_LENGTH]; /* buffer for the APDU to send */
137         int filled;  /* index of the last char in buf */
138         int cur_pos; /* index of the next char to send in buf */
139         __u16 device_type;
140 };
141
142
143 static int kobil_startup(struct usb_serial *serial)
144 {
145         int i;
146         struct kobil_private *priv;
147         struct usb_device *pdev;
148         struct usb_host_config *actconfig;
149         struct usb_interface *interface;
150         struct usb_host_interface *altsetting;
151         struct usb_host_endpoint *endpoint;
152
153         priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
154         if (!priv)
155                 return -ENOMEM;
156
157         priv->filled = 0;
158         priv->cur_pos = 0;
159         priv->device_type = le16_to_cpu(serial->dev->descriptor.idProduct);
160
161         switch (priv->device_type) {
162         case KOBIL_ADAPTER_B_PRODUCT_ID:
163                 printk(KERN_DEBUG "KOBIL B1 PRO / KAAN PRO detected\n");
164                 break;
165         case KOBIL_ADAPTER_K_PRODUCT_ID:
166                 printk(KERN_DEBUG
167                   "KOBIL KAAN Standard Plus / SecOVID Reader Plus detected\n");
168                 break;
169         case KOBIL_USBTWIN_PRODUCT_ID:
170                 printk(KERN_DEBUG "KOBIL USBTWIN detected\n");
171                 break;
172         case KOBIL_KAAN_SIM_PRODUCT_ID:
173                 printk(KERN_DEBUG "KOBIL KAAN SIM detected\n");
174                 break;
175         }
176         usb_set_serial_port_data(serial->port[0], priv);
177
178         /* search for the necessary endpoints */
179         pdev = serial->dev;
180         actconfig = pdev->actconfig;
181         interface = actconfig->interface[0];
182         altsetting = interface->cur_altsetting;
183         endpoint = altsetting->endpoint;
184
185         for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
186                 endpoint = &altsetting->endpoint[i];
187                 if (usb_endpoint_is_int_out(&endpoint->desc)) {
188                         dbg("%s Found interrupt out endpoint. Address: %d",
189                                 __func__, endpoint->desc.bEndpointAddress);
190                         priv->write_int_endpoint_address =
191                                 endpoint->desc.bEndpointAddress;
192                 }
193                 if (usb_endpoint_is_int_in(&endpoint->desc)) {
194                         dbg("%s Found interrupt in  endpoint. Address: %d",
195                                 __func__, endpoint->desc.bEndpointAddress);
196                         priv->read_int_endpoint_address =
197                                 endpoint->desc.bEndpointAddress;
198                 }
199         }
200         return 0;
201 }
202
203
204 static void kobil_release(struct usb_serial *serial)
205 {
206         int i;
207         dbg("%s - port %d", __func__, serial->port[0]->number);
208
209         for (i = 0; i < serial->num_ports; ++i)
210                 kfree(usb_get_serial_port_data(serial->port[i]));
211 }
212
213 static void kobil_init_termios(struct tty_struct *tty)
214 {
215         /* Default to echo off and other sane device settings */
216         tty->termios->c_lflag = 0;
217         tty->termios->c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN | XCASE);
218         tty->termios->c_iflag = IGNBRK | IGNPAR | IXOFF;
219         /* do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D) */
220         tty->termios->c_oflag &= ~ONLCR;
221 }
222
223 static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port)
224 {
225         int result = 0;
226         struct kobil_private *priv;
227         unsigned char *transfer_buffer;
228         int transfer_buffer_length = 8;
229         int write_urb_transfer_buffer_length = 8;
230
231         dbg("%s - port %d", __func__, port->number);
232         priv = usb_get_serial_port_data(port);
233
234         /* someone sets the dev to 0 if the close method has been called */
235         port->interrupt_in_urb->dev = port->serial->dev;
236
237         /* allocate memory for transfer buffer */
238         transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
239         if (!transfer_buffer)
240                 return -ENOMEM;
241
242         /* allocate write_urb */
243         if (!port->write_urb) {
244                 dbg("%s - port %d  Allocating port->write_urb",
245                                                 __func__, port->number);
246                 port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
247                 if (!port->write_urb) {
248                         dbg("%s - port %d usb_alloc_urb failed",
249                                                 __func__, port->number);
250                         kfree(transfer_buffer);
251                         return -ENOMEM;
252                 }
253         }
254
255         /* allocate memory for write_urb transfer buffer */
256         port->write_urb->transfer_buffer =
257                         kmalloc(write_urb_transfer_buffer_length, GFP_KERNEL);
258         if (!port->write_urb->transfer_buffer) {
259                 kfree(transfer_buffer);
260                 usb_free_urb(port->write_urb);
261                 port->write_urb = NULL;
262                 return -ENOMEM;
263         }
264
265         /* get hardware version */
266         result = usb_control_msg(port->serial->dev,
267                           usb_rcvctrlpipe(port->serial->dev, 0),
268                           SUSBCRequest_GetMisc,
269                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
270                           SUSBCR_MSC_GetHWVersion,
271                           0,
272                           transfer_buffer,
273                           transfer_buffer_length,
274                           KOBIL_TIMEOUT
275         );
276         dbg("%s - port %d Send get_HW_version URB returns: %i",
277                 __func__, port->number, result);
278         dbg("Harware version: %i.%i.%i",
279                 transfer_buffer[0], transfer_buffer[1], transfer_buffer[2]);
280
281         /* get firmware version */
282         result = usb_control_msg(port->serial->dev,
283                           usb_rcvctrlpipe(port->serial->dev, 0),
284                           SUSBCRequest_GetMisc,
285                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
286                           SUSBCR_MSC_GetFWVersion,
287                           0,
288                           transfer_buffer,
289                           transfer_buffer_length,
290                           KOBIL_TIMEOUT
291         );
292         dbg("%s - port %d Send get_FW_version URB returns: %i",
293                                         __func__, port->number, result);
294         dbg("Firmware version: %i.%i.%i",
295                 transfer_buffer[0], transfer_buffer[1], transfer_buffer[2]);
296
297         if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
298                         priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
299                 /* Setting Baudrate, Parity and Stopbits */
300                 result = usb_control_msg(port->serial->dev,
301                           usb_rcvctrlpipe(port->serial->dev, 0),
302                           SUSBCRequest_SetBaudRateParityAndStopBits,
303                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
304                           SUSBCR_SBR_9600 | SUSBCR_SPASB_EvenParity |
305                                                         SUSBCR_SPASB_1StopBit,
306                           0,
307                           transfer_buffer,
308                           0,
309                           KOBIL_TIMEOUT
310                 );
311                 dbg("%s - port %d Send set_baudrate URB returns: %i",
312                                         __func__, port->number, result);
313
314                 /* reset all queues */
315                 result = usb_control_msg(port->serial->dev,
316                           usb_rcvctrlpipe(port->serial->dev, 0),
317                           SUSBCRequest_Misc,
318                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
319                           SUSBCR_MSC_ResetAllQueues,
320                           0,
321                           transfer_buffer,
322                           0,
323                           KOBIL_TIMEOUT
324                 );
325                 dbg("%s - port %d Send reset_all_queues URB returns: %i",
326                                         __func__, port->number, result);
327         }
328         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
329             priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
330             priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
331                 /* start reading (Adapter B 'cause PNP string) */
332                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
333                 dbg("%s - port %d Send read URB returns: %i",
334                                         __func__, port->number, result);
335         }
336
337         kfree(transfer_buffer);
338         return 0;
339 }
340
341
342 static void kobil_close(struct usb_serial_port *port)
343 {
344         dbg("%s - port %d", __func__, port->number);
345
346         /* FIXME: Add rts/dtr methods */
347         if (port->write_urb) {
348                 usb_poison_urb(port->write_urb);
349                 kfree(port->write_urb->transfer_buffer);
350                 usb_free_urb(port->write_urb);
351                 port->write_urb = NULL;
352         }
353         usb_kill_urb(port->interrupt_in_urb);
354 }
355
356
357 static void kobil_read_int_callback(struct urb *urb)
358 {
359         int result;
360         struct usb_serial_port *port = urb->context;
361         struct tty_struct *tty;
362         unsigned char *data = urb->transfer_buffer;
363         int status = urb->status;
364 /*      char *dbg_data; */
365
366         dbg("%s - port %d", __func__, port->number);
367
368         if (status) {
369                 dbg("%s - port %d Read int status not zero: %d",
370                     __func__, port->number, status);
371                 return;
372         }
373
374         tty = tty_port_tty_get(&port->port);
375         if (tty && urb->actual_length) {
376
377                 /* BEGIN DEBUG */
378                 /*
379                   dbg_data = kzalloc((3 *  purb->actual_length + 10)
380                                                 * sizeof(char), GFP_KERNEL);
381                   if (! dbg_data) {
382                           return;
383                   }
384                   for (i = 0; i < purb->actual_length; i++) {
385                           sprintf(dbg_data +3*i, "%02X ", data[i]);
386                   }
387                   dbg(" <-- %s", dbg_data);
388                   kfree(dbg_data);
389                 */
390                 /* END DEBUG */
391
392                 tty_insert_flip_string(tty, data, urb->actual_length);
393                 tty_flip_buffer_push(tty);
394         }
395         tty_kref_put(tty);
396         /* someone sets the dev to 0 if the close method has been called */
397         port->interrupt_in_urb->dev = port->serial->dev;
398
399         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
400         dbg("%s - port %d Send read URB returns: %i",
401                         __func__, port->number, result);
402 }
403
404
405 static void kobil_write_callback(struct urb *purb)
406 {
407 }
408
409
410 static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
411                         const unsigned char *buf, int count)
412 {
413         int length = 0;
414         int result = 0;
415         int todo = 0;
416         struct kobil_private *priv;
417
418         if (count == 0) {
419                 dbg("%s - port %d write request of 0 bytes",
420                                                 __func__, port->number);
421                 return 0;
422         }
423
424         priv = usb_get_serial_port_data(port);
425
426         if (count > (KOBIL_BUF_LENGTH - priv->filled)) {
427                 dbg("%s - port %d Error: write request bigger than buffer size", __func__, port->number);
428                 return -ENOMEM;
429         }
430
431         /* Copy data to buffer */
432         memcpy(priv->buf + priv->filled, buf, count);
433         usb_serial_debug_data(debug, &port->dev, __func__, count,
434                                                 priv->buf + priv->filled);
435         priv->filled = priv->filled + count;
436
437         /* only send complete block. TWIN, KAAN SIM and adapter K
438            use the same protocol. */
439         if (((priv->device_type != KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 2) && (priv->filled >= (priv->buf[1] + 3))) ||
440              ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 3) && (priv->filled >= (priv->buf[2] + 4)))) {
441                 /* stop reading (except TWIN and KAAN SIM) */
442                 if ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID)
443                         || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID))
444                         usb_kill_urb(port->interrupt_in_urb);
445
446                 todo = priv->filled - priv->cur_pos;
447
448                 while (todo > 0) {
449                         /* max 8 byte in one urb (endpoint size) */
450                         length = (todo < 8) ? todo : 8;
451                         /* copy data to transfer buffer */
452                         memcpy(port->write_urb->transfer_buffer,
453                                         priv->buf + priv->cur_pos, length);
454                         usb_fill_int_urb(port->write_urb,
455                                   port->serial->dev,
456                                   usb_sndintpipe(port->serial->dev,
457                                         priv->write_int_endpoint_address),
458                                   port->write_urb->transfer_buffer,
459                                   length,
460                                   kobil_write_callback,
461                                   port,
462                                   8
463                         );
464
465                         priv->cur_pos = priv->cur_pos + length;
466                         result = usb_submit_urb(port->write_urb, GFP_NOIO);
467                         dbg("%s - port %d Send write URB returns: %i",
468                                         __func__, port->number, result);
469                         todo = priv->filled - priv->cur_pos;
470
471                         if (todo > 0)
472                                 msleep(24);
473                 }
474
475                 priv->filled = 0;
476                 priv->cur_pos = 0;
477
478                 /* someone sets the dev to 0 if the close method
479                    has been called */
480                 port->interrupt_in_urb->dev = port->serial->dev;
481
482                 /* start reading (except TWIN and KAAN SIM) */
483                 if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
484                         priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
485                         /* someone sets the dev to 0 if the close method has
486                            been called */
487                         port->interrupt_in_urb->dev = port->serial->dev;
488
489                         result = usb_submit_urb(port->interrupt_in_urb,
490                                                                 GFP_NOIO);
491                         dbg("%s - port %d Send read URB returns: %i",
492                                         __func__, port->number, result);
493                 }
494         }
495         return count;
496 }
497
498
499 static int kobil_write_room(struct tty_struct *tty)
500 {
501         /* dbg("%s - port %d", __func__, port->number); */
502         /* FIXME */
503         return 8;
504 }
505
506
507 static int kobil_tiocmget(struct tty_struct *tty, struct file *file)
508 {
509         struct usb_serial_port *port = tty->driver_data;
510         struct kobil_private *priv;
511         int result;
512         unsigned char *transfer_buffer;
513         int transfer_buffer_length = 8;
514
515         priv = usb_get_serial_port_data(port);
516         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID
517                         || priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
518                 /* This device doesn't support ioctl calls */
519                 return -EINVAL;
520         }
521
522         /* allocate memory for transfer buffer */
523         transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
524         if (!transfer_buffer)
525                 return -ENOMEM;
526
527         result = usb_control_msg(port->serial->dev,
528                           usb_rcvctrlpipe(port->serial->dev, 0),
529                           SUSBCRequest_GetStatusLineState,
530                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
531                           0,
532                           0,
533                           transfer_buffer,
534                           transfer_buffer_length,
535                           KOBIL_TIMEOUT);
536
537         dbg("%s - port %d Send get_status_line_state URB returns: %i. Statusline: %02x",
538             __func__, port->number, result, transfer_buffer[0]);
539
540         result = 0;
541         if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0)
542                 result = TIOCM_DSR;
543         kfree(transfer_buffer);
544         return result;
545 }
546
547 static int kobil_tiocmset(struct tty_struct *tty, struct file *file,
548                            unsigned int set, unsigned int clear)
549 {
550         struct usb_serial_port *port = tty->driver_data;
551         struct kobil_private *priv;
552         int result;
553         int dtr = 0;
554         int rts = 0;
555         unsigned char *transfer_buffer;
556         int transfer_buffer_length = 8;
557
558         /* FIXME: locking ? */
559         priv = usb_get_serial_port_data(port);
560         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID
561                 || priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
562                 /* This device doesn't support ioctl calls */
563                 return -EINVAL;
564         }
565
566         /* allocate memory for transfer buffer */
567         transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
568         if (!transfer_buffer)
569                 return -ENOMEM;
570
571         if (set & TIOCM_RTS)
572                 rts = 1;
573         if (set & TIOCM_DTR)
574                 dtr = 1;
575         if (clear & TIOCM_RTS)
576                 rts = 0;
577         if (clear & TIOCM_DTR)
578                 dtr = 0;
579
580         if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) {
581                 if (dtr != 0)
582                         dbg("%s - port %d Setting DTR",
583                                                 __func__, port->number);
584                 else
585                         dbg("%s - port %d Clearing DTR",
586                                                 __func__, port->number);
587                 result = usb_control_msg(port->serial->dev,
588                           usb_rcvctrlpipe(port->serial->dev, 0),
589                           SUSBCRequest_SetStatusLinesOrQueues,
590                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
591                           ((dtr != 0) ? SUSBCR_SSL_SETDTR : SUSBCR_SSL_CLRDTR),
592                           0,
593                           transfer_buffer,
594                           0,
595                           KOBIL_TIMEOUT);
596         } else {
597                 if (rts != 0)
598                         dbg("%s - port %d Setting RTS",
599                                                 __func__, port->number);
600                 else
601                         dbg("%s - port %d Clearing RTS",
602                                                 __func__, port->number);
603                 result = usb_control_msg(port->serial->dev,
604                         usb_rcvctrlpipe(port->serial->dev, 0),
605                         SUSBCRequest_SetStatusLinesOrQueues,
606                         USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
607                         ((rts != 0) ? SUSBCR_SSL_SETRTS : SUSBCR_SSL_CLRRTS),
608                         0,
609                         transfer_buffer,
610                         0,
611                         KOBIL_TIMEOUT);
612         }
613         dbg("%s - port %d Send set_status_line URB returns: %i",
614                                         __func__, port->number, result);
615         kfree(transfer_buffer);
616         return (result < 0) ? result : 0;
617 }
618
619 static void kobil_set_termios(struct tty_struct *tty,
620                         struct usb_serial_port *port, struct ktermios *old)
621 {
622         struct kobil_private *priv;
623         int result;
624         unsigned short urb_val = 0;
625         int c_cflag = tty->termios->c_cflag;
626         speed_t speed;
627
628         priv = usb_get_serial_port_data(port);
629         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
630                         priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
631                 /* This device doesn't support ioctl calls */
632                 *tty->termios = *old;
633                 return;
634         }
635
636         speed = tty_get_baud_rate(tty);
637         switch (speed) {
638         case 1200:
639                 urb_val = SUSBCR_SBR_1200;
640                 break;
641         default:
642                 speed = 9600;
643         case 9600:
644                 urb_val = SUSBCR_SBR_9600;
645                 break;
646         }
647         urb_val |= (c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits :
648                                                         SUSBCR_SPASB_1StopBit;
649         if (c_cflag & PARENB) {
650                 if  (c_cflag & PARODD)
651                         urb_val |= SUSBCR_SPASB_OddParity;
652                 else
653                         urb_val |= SUSBCR_SPASB_EvenParity;
654         } else
655                 urb_val |= SUSBCR_SPASB_NoParity;
656         tty->termios->c_cflag &= ~CMSPAR;
657         tty_encode_baud_rate(tty, speed, speed);
658
659         result = usb_control_msg(port->serial->dev,
660                   usb_rcvctrlpipe(port->serial->dev, 0),
661                   SUSBCRequest_SetBaudRateParityAndStopBits,
662                   USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
663                   urb_val,
664                   0,
665                   NULL,
666                   0,
667                   KOBIL_TIMEOUT
668                 );
669 }
670
671 static int kobil_ioctl(struct tty_struct *tty, struct file *file,
672                                         unsigned int cmd, unsigned long arg)
673 {
674         struct usb_serial_port *port = tty->driver_data;
675         struct kobil_private *priv = usb_get_serial_port_data(port);
676         unsigned char *transfer_buffer;
677         int transfer_buffer_length = 8;
678         int result;
679
680         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
681                         priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)
682                 /* This device doesn't support ioctl calls */
683                 return -ENOIOCTLCMD;
684
685         switch (cmd) {
686         case TCFLSH:
687                 transfer_buffer = kmalloc(transfer_buffer_length, GFP_KERNEL);
688                 if (!transfer_buffer)
689                         return -ENOBUFS;
690
691                 result = usb_control_msg(port->serial->dev,
692                           usb_rcvctrlpipe(port->serial->dev, 0),
693                           SUSBCRequest_Misc,
694                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
695                           SUSBCR_MSC_ResetAllQueues,
696                           0,
697                           NULL, /* transfer_buffer, */
698                           0,
699                           KOBIL_TIMEOUT
700                         );
701
702                 dbg("%s - port %d Send reset_all_queues (FLUSH) URB returns: %i", __func__, port->number, result);
703                 kfree(transfer_buffer);
704                 return (result < 0) ? -EIO: 0;
705         default:
706                 return -ENOIOCTLCMD;
707         }
708 }
709
710 static int __init kobil_init(void)
711 {
712         int retval;
713         retval = usb_serial_register(&kobil_device);
714         if (retval)
715                 goto failed_usb_serial_register;
716         retval = usb_register(&kobil_driver);
717         if (retval)
718                 goto failed_usb_register;
719
720         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
721                DRIVER_DESC "\n");
722
723         return 0;
724 failed_usb_register:
725         usb_serial_deregister(&kobil_device);
726 failed_usb_serial_register:
727         return retval;
728 }
729
730
731 static void __exit kobil_exit(void)
732 {
733         usb_deregister(&kobil_driver);
734         usb_serial_deregister(&kobil_device);
735 }
736
737 module_init(kobil_init);
738 module_exit(kobil_exit);
739
740 MODULE_AUTHOR(DRIVER_AUTHOR);
741 MODULE_DESCRIPTION(DRIVER_DESC);
742 MODULE_LICENSE("GPL");
743
744 module_param(debug, bool, S_IRUGO | S_IWUSR);
745 MODULE_PARM_DESC(debug, "Debug enabled or not");