Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6] / drivers / usb / serial / cp2101.c
1 /*
2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
3  *
4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
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
8  *      2 as published by the Free Software Foundation.
9  *
10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12  * control thanks to Munir Nassar nassarmu@real-time.com
13  *
14  * Outstanding Issues:
15  *  Buffers are not flushed when the port is opened.
16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
17  *
18  */
19
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/slab.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/usb.h>
28 #include <asm/uaccess.h>
29 #include <linux/usb/serial.h>
30
31 /*
32  * Version Information
33  */
34 #define DRIVER_VERSION "v0.07"
35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
36
37 /*
38  * Function Prototypes
39  */
40 static int cp2101_open(struct usb_serial_port*, struct file*);
41 static void cp2101_cleanup(struct usb_serial_port*);
42 static void cp2101_close(struct usb_serial_port*, struct file*);
43 static void cp2101_get_termios(struct usb_serial_port*);
44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
47                 unsigned int, unsigned int);
48 static void cp2101_break_ctl(struct usb_serial_port*, int);
49 static int cp2101_startup (struct usb_serial *);
50 static void cp2101_shutdown(struct usb_serial*);
51
52
53 static int debug;
54
55 static struct usb_device_id id_table [] = {
56         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
58         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
59         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
60         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
61         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
62         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
63         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
64         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
65         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
66         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
67         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
68         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
69         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
70         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
71         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
72         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
73         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
74         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
75         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
76         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
77         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
78         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
79         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
80         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
81         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
82         { } /* Terminating Entry */
83 };
84
85 MODULE_DEVICE_TABLE (usb, id_table);
86
87 static struct usb_driver cp2101_driver = {
88         .name           = "cp2101",
89         .probe          = usb_serial_probe,
90         .disconnect     = usb_serial_disconnect,
91         .id_table       = id_table,
92         .no_dynamic_id  =       1,
93 };
94
95 static struct usb_serial_driver cp2101_device = {
96         .driver = {
97                 .owner =        THIS_MODULE,
98                 .name =         "cp2101",
99         },
100         .usb_driver             = &cp2101_driver,
101         .id_table               = id_table,
102         .num_interrupt_in       = 0,
103         .num_bulk_in            = NUM_DONT_CARE,
104         .num_bulk_out           = NUM_DONT_CARE,
105         .num_ports              = 1,
106         .open                   = cp2101_open,
107         .close                  = cp2101_close,
108         .break_ctl              = cp2101_break_ctl,
109         .set_termios            = cp2101_set_termios,
110         .tiocmget               = cp2101_tiocmget,
111         .tiocmset               = cp2101_tiocmset,
112         .attach                 = cp2101_startup,
113         .shutdown               = cp2101_shutdown,
114 };
115
116 /* Config request types */
117 #define REQTYPE_HOST_TO_DEVICE  0x41
118 #define REQTYPE_DEVICE_TO_HOST  0xc1
119
120 /* Config SET requests. To GET, add 1 to the request number */
121 #define CP2101_UART             0x00    /* Enable / Disable */
122 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
123 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
124 #define CP2101_BREAK            0x05    /* On / Off */
125 #define CP2101_CONTROL          0x07    /* Flow control line states */
126 #define CP2101_MODEMCTL         0x13    /* Modem controls */
127 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
128
129 /* CP2101_UART */
130 #define UART_ENABLE             0x0001
131 #define UART_DISABLE            0x0000
132
133 /* CP2101_BAUDRATE */
134 #define BAUD_RATE_GEN_FREQ      0x384000
135
136 /* CP2101_BITS */
137 #define BITS_DATA_MASK          0X0f00
138 #define BITS_DATA_5             0X0500
139 #define BITS_DATA_6             0X0600
140 #define BITS_DATA_7             0X0700
141 #define BITS_DATA_8             0X0800
142 #define BITS_DATA_9             0X0900
143
144 #define BITS_PARITY_MASK        0x00f0
145 #define BITS_PARITY_NONE        0x0000
146 #define BITS_PARITY_ODD         0x0010
147 #define BITS_PARITY_EVEN        0x0020
148 #define BITS_PARITY_MARK        0x0030
149 #define BITS_PARITY_SPACE       0x0040
150
151 #define BITS_STOP_MASK          0x000f
152 #define BITS_STOP_1             0x0000
153 #define BITS_STOP_1_5           0x0001
154 #define BITS_STOP_2             0x0002
155
156 /* CP2101_BREAK */
157 #define BREAK_ON                0x0000
158 #define BREAK_OFF               0x0001
159
160 /* CP2101_CONTROL */
161 #define CONTROL_DTR             0x0001
162 #define CONTROL_RTS             0x0002
163 #define CONTROL_CTS             0x0010
164 #define CONTROL_DSR             0x0020
165 #define CONTROL_RING            0x0040
166 #define CONTROL_DCD             0x0080
167 #define CONTROL_WRITE_DTR       0x0100
168 #define CONTROL_WRITE_RTS       0x0200
169
170 /*
171  * cp2101_get_config
172  * Reads from the CP2101 configuration registers
173  * 'size' is specified in bytes.
174  * 'data' is a pointer to a pre-allocated array of integers large
175  * enough to hold 'size' bytes (with 4 bytes to each integer)
176  */
177 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
178                 unsigned int *data, int size)
179 {
180         struct usb_serial *serial = port->serial;
181         __le32 *buf;
182         int result, i, length;
183
184         /* Number of integers required to contain the array */
185         length = (((size - 1) | 3) + 1)/4;
186
187         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
188         if (!buf) {
189                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
190                 return -ENOMEM;
191         }
192
193         /* For get requests, the request number must be incremented */
194         request++;
195
196         /* Issue the request, attempting to read 'size' bytes */
197         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
198                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
199                                 0, buf, size, 300);
200
201         /* Convert data into an array of integers */
202         for (i=0; i<length; i++)
203                 data[i] = le32_to_cpu(buf[i]);
204
205         kfree(buf);
206
207         if (result != size) {
208                 dev_err(&port->dev, "%s - Unable to send config request, "
209                                 "request=0x%x size=%d result=%d\n",
210                                 __FUNCTION__, request, size, result);
211                 return -EPROTO;
212         }
213
214         return 0;
215 }
216
217 /*
218  * cp2101_set_config
219  * Writes to the CP2101 configuration registers
220  * Values less than 16 bits wide are sent directly
221  * 'size' is specified in bytes.
222  */
223 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
224                 unsigned int *data, int size)
225 {
226         struct usb_serial *serial = port->serial;
227         __le32 *buf;
228         int result, i, length;
229
230         /* Number of integers required to contain the array */
231         length = (((size - 1) | 3) + 1)/4;
232
233         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
234         if (!buf) {
235                 dev_err(&port->dev, "%s - out of memory.\n",
236                                 __FUNCTION__);
237                 return -ENOMEM;
238         }
239
240         /* Array of integers into bytes */
241         for (i = 0; i < length; i++)
242                 buf[i] = cpu_to_le32(data[i]);
243
244         if (size > 2) {
245                 result = usb_control_msg (serial->dev,
246                                 usb_sndctrlpipe(serial->dev, 0),
247                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
248                                 0, buf, size, 300);
249         } else {
250                 result = usb_control_msg (serial->dev,
251                                 usb_sndctrlpipe(serial->dev, 0),
252                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
253                                 0, NULL, 0, 300);
254         }
255
256         kfree(buf);
257
258         if ((size > 2 && result != size) || result < 0) {
259                 dev_err(&port->dev, "%s - Unable to send request, "
260                                 "request=0x%x size=%d result=%d\n",
261                                 __FUNCTION__, request, size, result);
262                 return -EPROTO;
263         }
264
265         /* Single data value */
266         result = usb_control_msg (serial->dev,
267                         usb_sndctrlpipe(serial->dev, 0),
268                         request, REQTYPE_HOST_TO_DEVICE, data[0],
269                         0, NULL, 0, 300);
270         return 0;
271 }
272
273 /*
274  * cp2101_set_config_single
275  * Convenience function for calling cp2101_set_config on single data values
276  * without requiring an integer pointer
277  */
278 static inline int cp2101_set_config_single(struct usb_serial_port* port,
279                 u8 request, unsigned int data)
280 {
281         return cp2101_set_config(port, request, &data, 2);
282 }
283
284 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
285 {
286         struct usb_serial *serial = port->serial;
287         int result;
288
289         dbg("%s - port %d", __FUNCTION__, port->number);
290
291         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
292                 dev_err(&port->dev, "%s - Unable to enable UART\n",
293                                 __FUNCTION__);
294                 return -EPROTO;
295         }
296
297         /* Start reading from the device */
298         usb_fill_bulk_urb (port->read_urb, serial->dev,
299                         usb_rcvbulkpipe(serial->dev,
300                         port->bulk_in_endpointAddress),
301                         port->read_urb->transfer_buffer,
302                         port->read_urb->transfer_buffer_length,
303                         serial->type->read_bulk_callback,
304                         port);
305         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
306         if (result) {
307                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
308                                 "error %d\n", __FUNCTION__, result);
309                 return result;
310         }
311
312         /* Configure the termios structure */
313         cp2101_get_termios(port);
314
315         /* Set the DTR and RTS pins low */
316         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
317
318         return 0;
319 }
320
321 static void cp2101_cleanup (struct usb_serial_port *port)
322 {
323         struct usb_serial *serial = port->serial;
324
325         dbg("%s - port %d", __FUNCTION__, port->number);
326
327         if (serial->dev) {
328                 /* shutdown any bulk reads that might be going on */
329                 if (serial->num_bulk_out)
330                         usb_kill_urb(port->write_urb);
331                 if (serial->num_bulk_in)
332                         usb_kill_urb(port->read_urb);
333         }
334 }
335
336 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
337 {
338         dbg("%s - port %d", __FUNCTION__, port->number);
339
340         /* shutdown our urbs */
341         dbg("%s - shutting down urbs", __FUNCTION__);
342         usb_kill_urb(port->write_urb);
343         usb_kill_urb(port->read_urb);
344
345         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
346 }
347
348 /*
349  * cp2101_get_termios
350  * Reads the baud rate, data bits, parity, stop bits and flow control mode
351  * from the device, corrects any unsupported values, and configures the
352  * termios structure to reflect the state of the device
353  */
354 static void cp2101_get_termios (struct usb_serial_port *port)
355 {
356         unsigned int cflag, modem_ctl[4];
357         int baud;
358         int bits;
359
360         dbg("%s - port %d", __FUNCTION__, port->number);
361
362         if (!port->tty || !port->tty->termios) {
363                 dbg("%s - no tty structures", __FUNCTION__);
364                 return;
365         }
366
367         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
368         /* Convert to baudrate */
369         if (baud)
370                 baud = BAUD_RATE_GEN_FREQ / baud;
371
372         dbg("%s - baud rate = %d", __FUNCTION__, baud);
373
374         tty_encode_baud_rate(port->tty, baud, baud);
375         cflag = port->tty->termios->c_cflag;
376
377         cp2101_get_config(port, CP2101_BITS, &bits, 2);
378         cflag &= ~CSIZE;
379         switch(bits & BITS_DATA_MASK) {
380                 case BITS_DATA_5:
381                         dbg("%s - data bits = 5", __FUNCTION__);
382                         cflag |= CS5;
383                         break;
384                 case BITS_DATA_6:
385                         dbg("%s - data bits = 6", __FUNCTION__);
386                         cflag |= CS6;
387                         break;
388                 case BITS_DATA_7:
389                         dbg("%s - data bits = 7", __FUNCTION__);
390                         cflag |= CS7;
391                         break;
392                 case BITS_DATA_8:
393                         dbg("%s - data bits = 8", __FUNCTION__);
394                         cflag |= CS8;
395                         break;
396                 case BITS_DATA_9:
397                         dbg("%s - data bits = 9 (not supported, "
398                                         "using 8 data bits)", __FUNCTION__);
399                         cflag |= CS8;
400                         bits &= ~BITS_DATA_MASK;
401                         bits |= BITS_DATA_8;
402                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
403                         break;
404                 default:
405                         dbg("%s - Unknown number of data bits, "
406                                         "using 8", __FUNCTION__);
407                         cflag |= CS8;
408                         bits &= ~BITS_DATA_MASK;
409                         bits |= BITS_DATA_8;
410                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
411                         break;
412         }
413
414         switch(bits & BITS_PARITY_MASK) {
415                 case BITS_PARITY_NONE:
416                         dbg("%s - parity = NONE", __FUNCTION__);
417                         cflag &= ~PARENB;
418                         break;
419                 case BITS_PARITY_ODD:
420                         dbg("%s - parity = ODD", __FUNCTION__);
421                         cflag |= (PARENB|PARODD);
422                         break;
423                 case BITS_PARITY_EVEN:
424                         dbg("%s - parity = EVEN", __FUNCTION__);
425                         cflag &= ~PARODD;
426                         cflag |= PARENB;
427                         break;
428                 case BITS_PARITY_MARK:
429                         dbg("%s - parity = MARK (not supported, "
430                                         "disabling parity)", __FUNCTION__);
431                         cflag &= ~PARENB;
432                         bits &= ~BITS_PARITY_MASK;
433                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
434                         break;
435                 case BITS_PARITY_SPACE:
436                         dbg("%s - parity = SPACE (not supported, "
437                                         "disabling parity)", __FUNCTION__);
438                         cflag &= ~PARENB;
439                         bits &= ~BITS_PARITY_MASK;
440                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
441                         break;
442                 default:
443                         dbg("%s - Unknown parity mode, "
444                                         "disabling parity", __FUNCTION__);
445                         cflag &= ~PARENB;
446                         bits &= ~BITS_PARITY_MASK;
447                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
448                         break;
449         }
450
451         cflag &= ~CSTOPB;
452         switch(bits & BITS_STOP_MASK) {
453                 case BITS_STOP_1:
454                         dbg("%s - stop bits = 1", __FUNCTION__);
455                         break;
456                 case BITS_STOP_1_5:
457                         dbg("%s - stop bits = 1.5 (not supported, "
458                                         "using 1 stop bit)", __FUNCTION__);
459                         bits &= ~BITS_STOP_MASK;
460                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
461                         break;
462                 case BITS_STOP_2:
463                         dbg("%s - stop bits = 2", __FUNCTION__);
464                         cflag |= CSTOPB;
465                         break;
466                 default:
467                         dbg("%s - Unknown number of stop bits, "
468                                         "using 1 stop bit", __FUNCTION__);
469                         bits &= ~BITS_STOP_MASK;
470                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
471                         break;
472         }
473
474         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
475         if (modem_ctl[0] & 0x0008) {
476                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
477                 cflag |= CRTSCTS;
478         } else {
479                 dbg("%s - flow control = NONE", __FUNCTION__);
480                 cflag &= ~CRTSCTS;
481         }
482
483         port->tty->termios->c_cflag = cflag;
484 }
485
486 static void cp2101_set_termios (struct usb_serial_port *port,
487                 struct ktermios *old_termios)
488 {
489         unsigned int cflag, old_cflag;
490         int baud=0, bits;
491         unsigned int modem_ctl[4];
492
493         dbg("%s - port %d", __FUNCTION__, port->number);
494
495         if (!port->tty || !port->tty->termios) {
496                 dbg("%s - no tty structures", __FUNCTION__);
497                 return;
498         }
499         port->tty->termios->c_cflag &= ~CMSPAR;
500
501         cflag = port->tty->termios->c_cflag;
502         old_cflag = old_termios->c_cflag;
503         baud = tty_get_baud_rate(port->tty);
504
505         /* If the baud rate is to be updated*/
506         if (baud != tty_termios_baud_rate(old_termios)) {
507                 switch (baud) {
508                         case 0:
509                         case 600:
510                         case 1200:
511                         case 1800:
512                         case 2400:
513                         case 4800:
514                         case 7200:
515                         case 9600:
516                         case 14400:
517                         case 19200:
518                         case 28800:
519                         case 38400:
520                         case 55854:
521                         case 57600:
522                         case 115200:
523                         case 127117:
524                         case 230400:
525                         case 460800:
526                         case 921600:
527                         case 3686400:
528                                 break;
529                         default:
530                                 baud = 9600;
531                                 break;
532                 }
533
534                 if (baud) {
535                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
536                                         baud);
537                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
538                                                 (BAUD_RATE_GEN_FREQ / baud))) {
539                                 dev_err(&port->dev, "Baud rate requested not "
540                                                 "supported by device\n");
541                                 baud = tty_termios_baud_rate(old_termios);
542                         }
543                 }
544         }
545         /* Report back the resulting baud rate */
546         tty_encode_baud_rate(port->tty, baud, baud);
547
548         /* If the number of data bits is to be updated */
549         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
550                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
551                 bits &= ~BITS_DATA_MASK;
552                 switch (cflag & CSIZE) {
553                         case CS5:
554                                 bits |= BITS_DATA_5;
555                                 dbg("%s - data bits = 5", __FUNCTION__);
556                                 break;
557                         case CS6:
558                                 bits |= BITS_DATA_6;
559                                 dbg("%s - data bits = 6", __FUNCTION__);
560                                 break;
561                         case CS7:
562                                 bits |= BITS_DATA_7;
563                                 dbg("%s - data bits = 7", __FUNCTION__);
564                                 break;
565                         case CS8:
566                                 bits |= BITS_DATA_8;
567                                 dbg("%s - data bits = 8", __FUNCTION__);
568                                 break;
569                         /*case CS9:
570                                 bits |= BITS_DATA_9;
571                                 dbg("%s - data bits = 9", __FUNCTION__);
572                                 break;*/
573                         default:
574                                 dev_err(&port->dev, "cp2101 driver does not "
575                                         "support the number of bits requested,"
576                                         " using 8 bit mode\n");
577                                 bits |= BITS_DATA_8;
578                                 break;
579                 }
580                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
581                         dev_err(&port->dev, "Number of data bits requested "
582                                         "not supported by device\n");
583         }
584
585         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
586                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
587                 bits &= ~BITS_PARITY_MASK;
588                 if (cflag & PARENB) {
589                         if (cflag & PARODD) {
590                                 bits |= BITS_PARITY_ODD;
591                                 dbg("%s - parity = ODD", __FUNCTION__);
592                         } else {
593                                 bits |= BITS_PARITY_EVEN;
594                                 dbg("%s - parity = EVEN", __FUNCTION__);
595                         }
596                 }
597                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
598                         dev_err(&port->dev, "Parity mode not supported "
599                                         "by device\n");
600         }
601
602         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
603                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
604                 bits &= ~BITS_STOP_MASK;
605                 if (cflag & CSTOPB) {
606                         bits |= BITS_STOP_2;
607                         dbg("%s - stop bits = 2", __FUNCTION__);
608                 } else {
609                         bits |= BITS_STOP_1;
610                         dbg("%s - stop bits = 1", __FUNCTION__);
611                 }
612                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
613                         dev_err(&port->dev, "Number of stop bits requested "
614                                         "not supported by device\n");
615         }
616
617         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
618                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
619                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
620                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
621                                 modem_ctl[2], modem_ctl[3]);
622
623                 if (cflag & CRTSCTS) {
624                         modem_ctl[0] &= ~0x7B;
625                         modem_ctl[0] |= 0x09;
626                         modem_ctl[1] = 0x80;
627                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
628                 } else {
629                         modem_ctl[0] &= ~0x7B;
630                         modem_ctl[0] |= 0x01;
631                         modem_ctl[1] |= 0x40;
632                         dbg("%s - flow control = NONE", __FUNCTION__);
633                 }
634
635                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
636                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
637                                 modem_ctl[2], modem_ctl[3]);
638                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
639         }
640
641 }
642
643 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
644                 unsigned int set, unsigned int clear)
645 {
646         int control = 0;
647
648         dbg("%s - port %d", __FUNCTION__, port->number);
649
650         if (set & TIOCM_RTS) {
651                 control |= CONTROL_RTS;
652                 control |= CONTROL_WRITE_RTS;
653         }
654         if (set & TIOCM_DTR) {
655                 control |= CONTROL_DTR;
656                 control |= CONTROL_WRITE_DTR;
657         }
658         if (clear & TIOCM_RTS) {
659                 control &= ~CONTROL_RTS;
660                 control |= CONTROL_WRITE_RTS;
661         }
662         if (clear & TIOCM_DTR) {
663                 control &= ~CONTROL_DTR;
664                 control |= CONTROL_WRITE_DTR;
665         }
666
667         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
668
669         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
670
671 }
672
673 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
674 {
675         int control, result;
676
677         dbg("%s - port %d", __FUNCTION__, port->number);
678
679         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
680
681         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
682                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
683                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
684                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
685                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
686                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
687
688         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
689
690         return result;
691 }
692
693 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
694 {
695         int state;
696
697         dbg("%s - port %d", __FUNCTION__, port->number);
698         if (break_state == 0)
699                 state = BREAK_OFF;
700         else
701                 state = BREAK_ON;
702         dbg("%s - turning break %s", __FUNCTION__,
703                         state==BREAK_OFF ? "off" : "on");
704         cp2101_set_config(port, CP2101_BREAK, &state, 2);
705 }
706
707 static int cp2101_startup (struct usb_serial *serial)
708 {
709         /* CP2101 buffers behave strangely unless device is reset */
710         usb_reset_device(serial->dev);
711         return 0;
712 }
713
714 static void cp2101_shutdown (struct usb_serial *serial)
715 {
716         int i;
717
718         dbg("%s", __FUNCTION__);
719
720         /* Stop reads and writes on all ports */
721         for (i=0; i < serial->num_ports; ++i) {
722                 cp2101_cleanup(serial->port[i]);
723         }
724 }
725
726 static int __init cp2101_init (void)
727 {
728         int retval;
729
730         retval = usb_serial_register(&cp2101_device);
731         if (retval)
732                 return retval; /* Failed to register */
733
734         retval = usb_register(&cp2101_driver);
735         if (retval) {
736                 /* Failed to register */
737                 usb_serial_deregister(&cp2101_device);
738                 return retval;
739         }
740
741         /* Success */
742         info(DRIVER_DESC " " DRIVER_VERSION);
743         return 0;
744 }
745
746 static void __exit cp2101_exit (void)
747 {
748         usb_deregister (&cp2101_driver);
749         usb_serial_deregister (&cp2101_device);
750 }
751
752 module_init(cp2101_init);
753 module_exit(cp2101_exit);
754
755 MODULE_DESCRIPTION(DRIVER_DESC);
756 MODULE_VERSION(DRIVER_VERSION);
757 MODULE_LICENSE("GPL");
758
759 module_param(debug, bool, S_IRUGO | S_IWUSR);
760 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");