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