Merge branch 'for-linus' of git://linux-nfs.org/~bfields/linux
[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, 0x800A) }, /* SPORTident BSM7-D-USB main station */
63         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
64         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
65         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
66         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
67         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
68         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
69         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
70         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
71         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
72         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
73         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
74         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
75         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
76         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
77         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
78         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
79         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
80         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
81         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
82         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
83         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
84         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
85         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
86         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
87         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
88         { } /* Terminating Entry */
89 };
90
91 MODULE_DEVICE_TABLE (usb, id_table);
92
93 static struct usb_driver cp2101_driver = {
94         .name           = "cp2101",
95         .probe          = usb_serial_probe,
96         .disconnect     = usb_serial_disconnect,
97         .id_table       = id_table,
98         .no_dynamic_id  =       1,
99 };
100
101 static struct usb_serial_driver cp2101_device = {
102         .driver = {
103                 .owner =        THIS_MODULE,
104                 .name =         "cp2101",
105         },
106         .usb_driver             = &cp2101_driver,
107         .id_table               = id_table,
108         .num_interrupt_in       = 0,
109         .num_bulk_in            = NUM_DONT_CARE,
110         .num_bulk_out           = NUM_DONT_CARE,
111         .num_ports              = 1,
112         .open                   = cp2101_open,
113         .close                  = cp2101_close,
114         .break_ctl              = cp2101_break_ctl,
115         .set_termios            = cp2101_set_termios,
116         .tiocmget               = cp2101_tiocmget,
117         .tiocmset               = cp2101_tiocmset,
118         .attach                 = cp2101_startup,
119         .shutdown               = cp2101_shutdown,
120 };
121
122 /* Config request types */
123 #define REQTYPE_HOST_TO_DEVICE  0x41
124 #define REQTYPE_DEVICE_TO_HOST  0xc1
125
126 /* Config SET requests. To GET, add 1 to the request number */
127 #define CP2101_UART             0x00    /* Enable / Disable */
128 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
129 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
130 #define CP2101_BREAK            0x05    /* On / Off */
131 #define CP2101_CONTROL          0x07    /* Flow control line states */
132 #define CP2101_MODEMCTL         0x13    /* Modem controls */
133 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
134
135 /* CP2101_UART */
136 #define UART_ENABLE             0x0001
137 #define UART_DISABLE            0x0000
138
139 /* CP2101_BAUDRATE */
140 #define BAUD_RATE_GEN_FREQ      0x384000
141
142 /* CP2101_BITS */
143 #define BITS_DATA_MASK          0X0f00
144 #define BITS_DATA_5             0X0500
145 #define BITS_DATA_6             0X0600
146 #define BITS_DATA_7             0X0700
147 #define BITS_DATA_8             0X0800
148 #define BITS_DATA_9             0X0900
149
150 #define BITS_PARITY_MASK        0x00f0
151 #define BITS_PARITY_NONE        0x0000
152 #define BITS_PARITY_ODD         0x0010
153 #define BITS_PARITY_EVEN        0x0020
154 #define BITS_PARITY_MARK        0x0030
155 #define BITS_PARITY_SPACE       0x0040
156
157 #define BITS_STOP_MASK          0x000f
158 #define BITS_STOP_1             0x0000
159 #define BITS_STOP_1_5           0x0001
160 #define BITS_STOP_2             0x0002
161
162 /* CP2101_BREAK */
163 #define BREAK_ON                0x0000
164 #define BREAK_OFF               0x0001
165
166 /* CP2101_CONTROL */
167 #define CONTROL_DTR             0x0001
168 #define CONTROL_RTS             0x0002
169 #define CONTROL_CTS             0x0010
170 #define CONTROL_DSR             0x0020
171 #define CONTROL_RING            0x0040
172 #define CONTROL_DCD             0x0080
173 #define CONTROL_WRITE_DTR       0x0100
174 #define CONTROL_WRITE_RTS       0x0200
175
176 /*
177  * cp2101_get_config
178  * Reads from the CP2101 configuration registers
179  * 'size' is specified in bytes.
180  * 'data' is a pointer to a pre-allocated array of integers large
181  * enough to hold 'size' bytes (with 4 bytes to each integer)
182  */
183 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
184                 unsigned int *data, int size)
185 {
186         struct usb_serial *serial = port->serial;
187         __le32 *buf;
188         int result, i, length;
189
190         /* Number of integers required to contain the array */
191         length = (((size - 1) | 3) + 1)/4;
192
193         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
194         if (!buf) {
195                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
196                 return -ENOMEM;
197         }
198
199         /* For get requests, the request number must be incremented */
200         request++;
201
202         /* Issue the request, attempting to read 'size' bytes */
203         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
204                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
205                                 0, buf, size, 300);
206
207         /* Convert data into an array of integers */
208         for (i=0; i<length; i++)
209                 data[i] = le32_to_cpu(buf[i]);
210
211         kfree(buf);
212
213         if (result != size) {
214                 dev_err(&port->dev, "%s - Unable to send config request, "
215                                 "request=0x%x size=%d result=%d\n",
216                                 __FUNCTION__, request, size, result);
217                 return -EPROTO;
218         }
219
220         return 0;
221 }
222
223 /*
224  * cp2101_set_config
225  * Writes to the CP2101 configuration registers
226  * Values less than 16 bits wide are sent directly
227  * 'size' is specified in bytes.
228  */
229 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
230                 unsigned int *data, int size)
231 {
232         struct usb_serial *serial = port->serial;
233         __le32 *buf;
234         int result, i, length;
235
236         /* Number of integers required to contain the array */
237         length = (((size - 1) | 3) + 1)/4;
238
239         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
240         if (!buf) {
241                 dev_err(&port->dev, "%s - out of memory.\n",
242                                 __FUNCTION__);
243                 return -ENOMEM;
244         }
245
246         /* Array of integers into bytes */
247         for (i = 0; i < length; i++)
248                 buf[i] = cpu_to_le32(data[i]);
249
250         if (size > 2) {
251                 result = usb_control_msg (serial->dev,
252                                 usb_sndctrlpipe(serial->dev, 0),
253                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
254                                 0, buf, size, 300);
255         } else {
256                 result = usb_control_msg (serial->dev,
257                                 usb_sndctrlpipe(serial->dev, 0),
258                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
259                                 0, NULL, 0, 300);
260         }
261
262         kfree(buf);
263
264         if ((size > 2 && result != size) || result < 0) {
265                 dev_err(&port->dev, "%s - Unable to send request, "
266                                 "request=0x%x size=%d result=%d\n",
267                                 __FUNCTION__, request, size, result);
268                 return -EPROTO;
269         }
270
271         /* Single data value */
272         result = usb_control_msg (serial->dev,
273                         usb_sndctrlpipe(serial->dev, 0),
274                         request, REQTYPE_HOST_TO_DEVICE, data[0],
275                         0, NULL, 0, 300);
276         return 0;
277 }
278
279 /*
280  * cp2101_set_config_single
281  * Convenience function for calling cp2101_set_config on single data values
282  * without requiring an integer pointer
283  */
284 static inline int cp2101_set_config_single(struct usb_serial_port* port,
285                 u8 request, unsigned int data)
286 {
287         return cp2101_set_config(port, request, &data, 2);
288 }
289
290 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
291 {
292         struct usb_serial *serial = port->serial;
293         int result;
294
295         dbg("%s - port %d", __FUNCTION__, port->number);
296
297         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
298                 dev_err(&port->dev, "%s - Unable to enable UART\n",
299                                 __FUNCTION__);
300                 return -EPROTO;
301         }
302
303         /* Start reading from the device */
304         usb_fill_bulk_urb (port->read_urb, serial->dev,
305                         usb_rcvbulkpipe(serial->dev,
306                         port->bulk_in_endpointAddress),
307                         port->read_urb->transfer_buffer,
308                         port->read_urb->transfer_buffer_length,
309                         serial->type->read_bulk_callback,
310                         port);
311         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
312         if (result) {
313                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
314                                 "error %d\n", __FUNCTION__, result);
315                 return result;
316         }
317
318         /* Configure the termios structure */
319         cp2101_get_termios(port);
320
321         /* Set the DTR and RTS pins low */
322         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
323
324         return 0;
325 }
326
327 static void cp2101_cleanup (struct usb_serial_port *port)
328 {
329         struct usb_serial *serial = port->serial;
330
331         dbg("%s - port %d", __FUNCTION__, port->number);
332
333         if (serial->dev) {
334                 /* shutdown any bulk reads that might be going on */
335                 if (serial->num_bulk_out)
336                         usb_kill_urb(port->write_urb);
337                 if (serial->num_bulk_in)
338                         usb_kill_urb(port->read_urb);
339         }
340 }
341
342 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
343 {
344         dbg("%s - port %d", __FUNCTION__, port->number);
345
346         /* shutdown our urbs */
347         dbg("%s - shutting down urbs", __FUNCTION__);
348         usb_kill_urb(port->write_urb);
349         usb_kill_urb(port->read_urb);
350
351         mutex_lock(&port->serial->disc_mutex);
352         if (!port->serial->disconnected)
353                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
354         mutex_unlock(&port->serial->disc_mutex);
355 }
356
357 /*
358  * cp2101_get_termios
359  * Reads the baud rate, data bits, parity, stop bits and flow control mode
360  * from the device, corrects any unsupported values, and configures the
361  * termios structure to reflect the state of the device
362  */
363 static void cp2101_get_termios (struct usb_serial_port *port)
364 {
365         unsigned int cflag, modem_ctl[4];
366         int baud;
367         int bits;
368
369         dbg("%s - port %d", __FUNCTION__, port->number);
370
371         if (!port->tty || !port->tty->termios) {
372                 dbg("%s - no tty structures", __FUNCTION__);
373                 return;
374         }
375
376         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
377         /* Convert to baudrate */
378         if (baud)
379                 baud = BAUD_RATE_GEN_FREQ / baud;
380
381         dbg("%s - baud rate = %d", __FUNCTION__, baud);
382
383         tty_encode_baud_rate(port->tty, baud, baud);
384         cflag = port->tty->termios->c_cflag;
385
386         cp2101_get_config(port, CP2101_BITS, &bits, 2);
387         cflag &= ~CSIZE;
388         switch(bits & BITS_DATA_MASK) {
389                 case BITS_DATA_5:
390                         dbg("%s - data bits = 5", __FUNCTION__);
391                         cflag |= CS5;
392                         break;
393                 case BITS_DATA_6:
394                         dbg("%s - data bits = 6", __FUNCTION__);
395                         cflag |= CS6;
396                         break;
397                 case BITS_DATA_7:
398                         dbg("%s - data bits = 7", __FUNCTION__);
399                         cflag |= CS7;
400                         break;
401                 case BITS_DATA_8:
402                         dbg("%s - data bits = 8", __FUNCTION__);
403                         cflag |= CS8;
404                         break;
405                 case BITS_DATA_9:
406                         dbg("%s - data bits = 9 (not supported, "
407                                         "using 8 data bits)", __FUNCTION__);
408                         cflag |= CS8;
409                         bits &= ~BITS_DATA_MASK;
410                         bits |= BITS_DATA_8;
411                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
412                         break;
413                 default:
414                         dbg("%s - Unknown number of data bits, "
415                                         "using 8", __FUNCTION__);
416                         cflag |= CS8;
417                         bits &= ~BITS_DATA_MASK;
418                         bits |= BITS_DATA_8;
419                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
420                         break;
421         }
422
423         switch(bits & BITS_PARITY_MASK) {
424                 case BITS_PARITY_NONE:
425                         dbg("%s - parity = NONE", __FUNCTION__);
426                         cflag &= ~PARENB;
427                         break;
428                 case BITS_PARITY_ODD:
429                         dbg("%s - parity = ODD", __FUNCTION__);
430                         cflag |= (PARENB|PARODD);
431                         break;
432                 case BITS_PARITY_EVEN:
433                         dbg("%s - parity = EVEN", __FUNCTION__);
434                         cflag &= ~PARODD;
435                         cflag |= PARENB;
436                         break;
437                 case BITS_PARITY_MARK:
438                         dbg("%s - parity = MARK (not supported, "
439                                         "disabling parity)", __FUNCTION__);
440                         cflag &= ~PARENB;
441                         bits &= ~BITS_PARITY_MASK;
442                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
443                         break;
444                 case BITS_PARITY_SPACE:
445                         dbg("%s - parity = SPACE (not supported, "
446                                         "disabling parity)", __FUNCTION__);
447                         cflag &= ~PARENB;
448                         bits &= ~BITS_PARITY_MASK;
449                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
450                         break;
451                 default:
452                         dbg("%s - Unknown parity mode, "
453                                         "disabling parity", __FUNCTION__);
454                         cflag &= ~PARENB;
455                         bits &= ~BITS_PARITY_MASK;
456                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
457                         break;
458         }
459
460         cflag &= ~CSTOPB;
461         switch(bits & BITS_STOP_MASK) {
462                 case BITS_STOP_1:
463                         dbg("%s - stop bits = 1", __FUNCTION__);
464                         break;
465                 case BITS_STOP_1_5:
466                         dbg("%s - stop bits = 1.5 (not supported, "
467                                         "using 1 stop bit)", __FUNCTION__);
468                         bits &= ~BITS_STOP_MASK;
469                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
470                         break;
471                 case BITS_STOP_2:
472                         dbg("%s - stop bits = 2", __FUNCTION__);
473                         cflag |= CSTOPB;
474                         break;
475                 default:
476                         dbg("%s - Unknown number of stop bits, "
477                                         "using 1 stop bit", __FUNCTION__);
478                         bits &= ~BITS_STOP_MASK;
479                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
480                         break;
481         }
482
483         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
484         if (modem_ctl[0] & 0x0008) {
485                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
486                 cflag |= CRTSCTS;
487         } else {
488                 dbg("%s - flow control = NONE", __FUNCTION__);
489                 cflag &= ~CRTSCTS;
490         }
491
492         port->tty->termios->c_cflag = cflag;
493 }
494
495 static void cp2101_set_termios (struct usb_serial_port *port,
496                 struct ktermios *old_termios)
497 {
498         unsigned int cflag, old_cflag;
499         int baud=0, bits;
500         unsigned int modem_ctl[4];
501
502         dbg("%s - port %d", __FUNCTION__, port->number);
503
504         if (!port->tty || !port->tty->termios) {
505                 dbg("%s - no tty structures", __FUNCTION__);
506                 return;
507         }
508         port->tty->termios->c_cflag &= ~CMSPAR;
509
510         cflag = port->tty->termios->c_cflag;
511         old_cflag = old_termios->c_cflag;
512         baud = tty_get_baud_rate(port->tty);
513
514         /* If the baud rate is to be updated*/
515         if (baud != tty_termios_baud_rate(old_termios)) {
516                 switch (baud) {
517                         case 0:
518                         case 600:
519                         case 1200:
520                         case 1800:
521                         case 2400:
522                         case 4800:
523                         case 7200:
524                         case 9600:
525                         case 14400:
526                         case 19200:
527                         case 28800:
528                         case 38400:
529                         case 55854:
530                         case 57600:
531                         case 115200:
532                         case 127117:
533                         case 230400:
534                         case 460800:
535                         case 921600:
536                         case 3686400:
537                                 break;
538                         default:
539                                 baud = 9600;
540                                 break;
541                 }
542
543                 if (baud) {
544                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
545                                         baud);
546                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
547                                                 (BAUD_RATE_GEN_FREQ / baud))) {
548                                 dev_err(&port->dev, "Baud rate requested not "
549                                                 "supported by device\n");
550                                 baud = tty_termios_baud_rate(old_termios);
551                         }
552                 }
553         }
554         /* Report back the resulting baud rate */
555         tty_encode_baud_rate(port->tty, baud, baud);
556
557         /* If the number of data bits is to be updated */
558         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
559                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
560                 bits &= ~BITS_DATA_MASK;
561                 switch (cflag & CSIZE) {
562                         case CS5:
563                                 bits |= BITS_DATA_5;
564                                 dbg("%s - data bits = 5", __FUNCTION__);
565                                 break;
566                         case CS6:
567                                 bits |= BITS_DATA_6;
568                                 dbg("%s - data bits = 6", __FUNCTION__);
569                                 break;
570                         case CS7:
571                                 bits |= BITS_DATA_7;
572                                 dbg("%s - data bits = 7", __FUNCTION__);
573                                 break;
574                         case CS8:
575                                 bits |= BITS_DATA_8;
576                                 dbg("%s - data bits = 8", __FUNCTION__);
577                                 break;
578                         /*case CS9:
579                                 bits |= BITS_DATA_9;
580                                 dbg("%s - data bits = 9", __FUNCTION__);
581                                 break;*/
582                         default:
583                                 dev_err(&port->dev, "cp2101 driver does not "
584                                         "support the number of bits requested,"
585                                         " using 8 bit mode\n");
586                                 bits |= BITS_DATA_8;
587                                 break;
588                 }
589                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
590                         dev_err(&port->dev, "Number of data bits requested "
591                                         "not supported by device\n");
592         }
593
594         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
595                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
596                 bits &= ~BITS_PARITY_MASK;
597                 if (cflag & PARENB) {
598                         if (cflag & PARODD) {
599                                 bits |= BITS_PARITY_ODD;
600                                 dbg("%s - parity = ODD", __FUNCTION__);
601                         } else {
602                                 bits |= BITS_PARITY_EVEN;
603                                 dbg("%s - parity = EVEN", __FUNCTION__);
604                         }
605                 }
606                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
607                         dev_err(&port->dev, "Parity mode not supported "
608                                         "by device\n");
609         }
610
611         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
612                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
613                 bits &= ~BITS_STOP_MASK;
614                 if (cflag & CSTOPB) {
615                         bits |= BITS_STOP_2;
616                         dbg("%s - stop bits = 2", __FUNCTION__);
617                 } else {
618                         bits |= BITS_STOP_1;
619                         dbg("%s - stop bits = 1", __FUNCTION__);
620                 }
621                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
622                         dev_err(&port->dev, "Number of stop bits requested "
623                                         "not supported by device\n");
624         }
625
626         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
627                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
628                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
629                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
630                                 modem_ctl[2], modem_ctl[3]);
631
632                 if (cflag & CRTSCTS) {
633                         modem_ctl[0] &= ~0x7B;
634                         modem_ctl[0] |= 0x09;
635                         modem_ctl[1] = 0x80;
636                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
637                 } else {
638                         modem_ctl[0] &= ~0x7B;
639                         modem_ctl[0] |= 0x01;
640                         modem_ctl[1] |= 0x40;
641                         dbg("%s - flow control = NONE", __FUNCTION__);
642                 }
643
644                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
645                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
646                                 modem_ctl[2], modem_ctl[3]);
647                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
648         }
649
650 }
651
652 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
653                 unsigned int set, unsigned int clear)
654 {
655         int control = 0;
656
657         dbg("%s - port %d", __FUNCTION__, port->number);
658
659         if (set & TIOCM_RTS) {
660                 control |= CONTROL_RTS;
661                 control |= CONTROL_WRITE_RTS;
662         }
663         if (set & TIOCM_DTR) {
664                 control |= CONTROL_DTR;
665                 control |= CONTROL_WRITE_DTR;
666         }
667         if (clear & TIOCM_RTS) {
668                 control &= ~CONTROL_RTS;
669                 control |= CONTROL_WRITE_RTS;
670         }
671         if (clear & TIOCM_DTR) {
672                 control &= ~CONTROL_DTR;
673                 control |= CONTROL_WRITE_DTR;
674         }
675
676         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
677
678         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
679
680 }
681
682 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
683 {
684         int control, result;
685
686         dbg("%s - port %d", __FUNCTION__, port->number);
687
688         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
689
690         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
691                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
692                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
693                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
694                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
695                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
696
697         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
698
699         return result;
700 }
701
702 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
703 {
704         int state;
705
706         dbg("%s - port %d", __FUNCTION__, port->number);
707         if (break_state == 0)
708                 state = BREAK_OFF;
709         else
710                 state = BREAK_ON;
711         dbg("%s - turning break %s", __FUNCTION__,
712                         state==BREAK_OFF ? "off" : "on");
713         cp2101_set_config(port, CP2101_BREAK, &state, 2);
714 }
715
716 static int cp2101_startup (struct usb_serial *serial)
717 {
718         /* CP2101 buffers behave strangely unless device is reset */
719         usb_reset_device(serial->dev);
720         return 0;
721 }
722
723 static void cp2101_shutdown (struct usb_serial *serial)
724 {
725         int i;
726
727         dbg("%s", __FUNCTION__);
728
729         /* Stop reads and writes on all ports */
730         for (i=0; i < serial->num_ports; ++i) {
731                 cp2101_cleanup(serial->port[i]);
732         }
733 }
734
735 static int __init cp2101_init (void)
736 {
737         int retval;
738
739         retval = usb_serial_register(&cp2101_device);
740         if (retval)
741                 return retval; /* Failed to register */
742
743         retval = usb_register(&cp2101_driver);
744         if (retval) {
745                 /* Failed to register */
746                 usb_serial_deregister(&cp2101_device);
747                 return retval;
748         }
749
750         /* Success */
751         info(DRIVER_DESC " " DRIVER_VERSION);
752         return 0;
753 }
754
755 static void __exit cp2101_exit (void)
756 {
757         usb_deregister (&cp2101_driver);
758         usb_serial_deregister (&cp2101_device);
759 }
760
761 module_init(cp2101_init);
762 module_exit(cp2101_exit);
763
764 MODULE_DESCRIPTION(DRIVER_DESC);
765 MODULE_VERSION(DRIVER_VERSION);
766 MODULE_LICENSE("GPL");
767
768 module_param(debug, bool, S_IRUGO | S_IWUSR);
769 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");