Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-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(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
57         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
58         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
59         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
60         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
61         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
66         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
67         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
68         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
69         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
70         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
71         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
72         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
73         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
74         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
75         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
76         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
77         { } /* Terminating Entry */
78 };
79
80 MODULE_DEVICE_TABLE (usb, id_table);
81
82 static struct usb_driver cp2101_driver = {
83         .name           = "cp2101",
84         .probe          = usb_serial_probe,
85         .disconnect     = usb_serial_disconnect,
86         .id_table       = id_table,
87         .no_dynamic_id  =       1,
88 };
89
90 static struct usb_serial_driver cp2101_device = {
91         .driver = {
92                 .owner =        THIS_MODULE,
93                 .name =         "cp2101",
94         },
95         .usb_driver             = &cp2101_driver,
96         .id_table               = id_table,
97         .num_interrupt_in       = 0,
98         .num_bulk_in            = 0,
99         .num_bulk_out           = 0,
100         .num_ports              = 1,
101         .open                   = cp2101_open,
102         .close                  = cp2101_close,
103         .break_ctl              = cp2101_break_ctl,
104         .set_termios            = cp2101_set_termios,
105         .tiocmget               = cp2101_tiocmget,
106         .tiocmset               = cp2101_tiocmset,
107         .attach                 = cp2101_startup,
108         .shutdown               = cp2101_shutdown,
109 };
110
111 /* Config request types */
112 #define REQTYPE_HOST_TO_DEVICE  0x41
113 #define REQTYPE_DEVICE_TO_HOST  0xc1
114
115 /* Config SET requests. To GET, add 1 to the request number */
116 #define CP2101_UART             0x00    /* Enable / Disable */
117 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
118 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
119 #define CP2101_BREAK            0x05    /* On / Off */
120 #define CP2101_CONTROL          0x07    /* Flow control line states */
121 #define CP2101_MODEMCTL         0x13    /* Modem controls */
122 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
123
124 /* CP2101_UART */
125 #define UART_ENABLE             0x0001
126 #define UART_DISABLE            0x0000
127
128 /* CP2101_BAUDRATE */
129 #define BAUD_RATE_GEN_FREQ      0x384000
130
131 /* CP2101_BITS */
132 #define BITS_DATA_MASK          0X0f00
133 #define BITS_DATA_5             0X0500
134 #define BITS_DATA_6             0X0600
135 #define BITS_DATA_7             0X0700
136 #define BITS_DATA_8             0X0800
137 #define BITS_DATA_9             0X0900
138
139 #define BITS_PARITY_MASK        0x00f0
140 #define BITS_PARITY_NONE        0x0000
141 #define BITS_PARITY_ODD         0x0010
142 #define BITS_PARITY_EVEN        0x0020
143 #define BITS_PARITY_MARK        0x0030
144 #define BITS_PARITY_SPACE       0x0040
145
146 #define BITS_STOP_MASK          0x000f
147 #define BITS_STOP_1             0x0000
148 #define BITS_STOP_1_5           0x0001
149 #define BITS_STOP_2             0x0002
150
151 /* CP2101_BREAK */
152 #define BREAK_ON                0x0000
153 #define BREAK_OFF               0x0001
154
155 /* CP2101_CONTROL */
156 #define CONTROL_DTR             0x0001
157 #define CONTROL_RTS             0x0002
158 #define CONTROL_CTS             0x0010
159 #define CONTROL_DSR             0x0020
160 #define CONTROL_RING            0x0040
161 #define CONTROL_DCD             0x0080
162 #define CONTROL_WRITE_DTR       0x0100
163 #define CONTROL_WRITE_RTS       0x0200
164
165 /*
166  * cp2101_get_config
167  * Reads from the CP2101 configuration registers
168  * 'size' is specified in bytes.
169  * 'data' is a pointer to a pre-allocated array of integers large
170  * enough to hold 'size' bytes (with 4 bytes to each integer)
171  */
172 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
173                 unsigned int *data, int size)
174 {
175         struct usb_serial *serial = port->serial;
176         __le32 *buf;
177         int result, i, length;
178
179         /* Number of integers required to contain the array */
180         length = (((size - 1) | 3) + 1)/4;
181
182         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
183         if (!buf) {
184                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
185                 return -ENOMEM;
186         }
187
188         /* For get requests, the request number must be incremented */
189         request++;
190
191         /* Issue the request, attempting to read 'size' bytes */
192         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
193                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
194                                 0, buf, size, 300);
195
196         /* Convert data into an array of integers */
197         for (i=0; i<length; i++)
198                 data[i] = le32_to_cpu(buf[i]);
199
200         kfree(buf);
201
202         if (result != size) {
203                 dev_err(&port->dev, "%s - Unable to send config request, "
204                                 "request=0x%x size=%d result=%d\n",
205                                 __FUNCTION__, request, size, result);
206                 return -EPROTO;
207         }
208
209         return 0;
210 }
211
212 /*
213  * cp2101_set_config
214  * Writes to the CP2101 configuration registers
215  * Values less than 16 bits wide are sent directly
216  * 'size' is specified in bytes.
217  */
218 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
219                 unsigned int *data, int size)
220 {
221         struct usb_serial *serial = port->serial;
222         __le32 *buf;
223         int result, i, length;
224
225         /* Number of integers required to contain the array */
226         length = (((size - 1) | 3) + 1)/4;
227
228         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
229         if (!buf) {
230                 dev_err(&port->dev, "%s - out of memory.\n",
231                                 __FUNCTION__);
232                 return -ENOMEM;
233         }
234
235         /* Array of integers into bytes */
236         for (i = 0; i < length; i++)
237                 buf[i] = cpu_to_le32(data[i]);
238
239         if (size > 2) {
240                 result = usb_control_msg (serial->dev,
241                                 usb_sndctrlpipe(serial->dev, 0),
242                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
243                                 0, buf, size, 300);
244         } else {
245                 result = usb_control_msg (serial->dev,
246                                 usb_sndctrlpipe(serial->dev, 0),
247                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
248                                 0, NULL, 0, 300);
249         }
250
251         kfree(buf);
252
253         if ((size > 2 && result != size) || result < 0) {
254                 dev_err(&port->dev, "%s - Unable to send request, "
255                                 "request=0x%x size=%d result=%d\n",
256                                 __FUNCTION__, request, size, result);
257                 return -EPROTO;
258         }
259
260         /* Single data value */
261         result = usb_control_msg (serial->dev,
262                         usb_sndctrlpipe(serial->dev, 0),
263                         request, REQTYPE_HOST_TO_DEVICE, data[0],
264                         0, NULL, 0, 300);
265         return 0;
266 }
267
268 /*
269  * cp2101_set_config_single
270  * Convenience function for calling cp2101_set_config on single data values
271  * without requiring an integer pointer
272  */
273 static inline int cp2101_set_config_single(struct usb_serial_port* port,
274                 u8 request, unsigned int data)
275 {
276         return cp2101_set_config(port, request, &data, 2);
277 }
278
279 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
280 {
281         struct usb_serial *serial = port->serial;
282         int result;
283
284         dbg("%s - port %d", __FUNCTION__, port->number);
285
286         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
287                 dev_err(&port->dev, "%s - Unable to enable UART\n",
288                                 __FUNCTION__);
289                 return -EPROTO;
290         }
291
292         /* Start reading from the device */
293         usb_fill_bulk_urb (port->read_urb, serial->dev,
294                         usb_rcvbulkpipe(serial->dev,
295                         port->bulk_in_endpointAddress),
296                         port->read_urb->transfer_buffer,
297                         port->read_urb->transfer_buffer_length,
298                         serial->type->read_bulk_callback,
299                         port);
300         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
301         if (result) {
302                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
303                                 "error %d\n", __FUNCTION__, result);
304                 return result;
305         }
306
307         /* Configure the termios structure */
308         cp2101_get_termios(port);
309
310         /* Set the DTR and RTS pins low */
311         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
312
313         return 0;
314 }
315
316 static void cp2101_cleanup (struct usb_serial_port *port)
317 {
318         struct usb_serial *serial = port->serial;
319
320         dbg("%s - port %d", __FUNCTION__, port->number);
321
322         if (serial->dev) {
323                 /* shutdown any bulk reads that might be going on */
324                 if (serial->num_bulk_out)
325                         usb_kill_urb(port->write_urb);
326                 if (serial->num_bulk_in)
327                         usb_kill_urb(port->read_urb);
328         }
329 }
330
331 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
332 {
333         dbg("%s - port %d", __FUNCTION__, port->number);
334
335         /* shutdown our urbs */
336         dbg("%s - shutting down urbs", __FUNCTION__);
337         usb_kill_urb(port->write_urb);
338         usb_kill_urb(port->read_urb);
339
340         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
341 }
342
343 /*
344  * cp2101_get_termios
345  * Reads the baud rate, data bits, parity, stop bits and flow control mode
346  * from the device, corrects any unsupported values, and configures the
347  * termios structure to reflect the state of the device
348  */
349 static void cp2101_get_termios (struct usb_serial_port *port)
350 {
351         unsigned int cflag, modem_ctl[4];
352         int baud;
353         int bits;
354
355         dbg("%s - port %d", __FUNCTION__, port->number);
356
357         if ((!port->tty) || (!port->tty->termios)) {
358                 dbg("%s - no tty structures", __FUNCTION__);
359                 return;
360         }
361         cflag = port->tty->termios->c_cflag;
362
363         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
364         /* Convert to baudrate */
365         if (baud)
366                 baud = BAUD_RATE_GEN_FREQ / baud;
367
368         dbg("%s - baud rate = %d", __FUNCTION__, baud);
369         cflag &= ~CBAUD;
370         switch (baud) {
371                 /*
372                  * The baud rates which are commented out below
373                  * appear to be supported by the device
374                  * but are non-standard
375                  */
376                 case 600:       cflag |= B600;          break;
377                 case 1200:      cflag |= B1200;         break;
378                 case 1800:      cflag |= B1800;         break;
379                 case 2400:      cflag |= B2400;         break;
380                 case 4800:      cflag |= B4800;         break;
381                 /*case 7200:    cflag |= B7200;         break;*/
382                 case 9600:      cflag |= B9600;         break;
383                 /*case 14400:   cflag |= B14400;        break;*/
384                 case 19200:     cflag |= B19200;        break;
385                 /*case 28800:   cflag |= B28800;        break;*/
386                 case 38400:     cflag |= B38400;        break;
387                 /*case 55854:   cflag |= B55054;        break;*/
388                 case 57600:     cflag |= B57600;        break;
389                 case 115200:    cflag |= B115200;       break;
390                 /*case 127117:  cflag |= B127117;       break;*/
391                 case 230400:    cflag |= B230400;       break;
392                 case 460800:    cflag |= B460800;       break;
393                 case 921600:    cflag |= B921600;       break;
394                 /*case 3686400: cflag |= B3686400;      break;*/
395                 default:
396                         dbg("%s - Baud rate is not supported, "
397                                         "using 9600 baud", __FUNCTION__);
398                         cflag |= B9600;
399                         cp2101_set_config_single(port, CP2101_BAUDRATE,
400                                         (BAUD_RATE_GEN_FREQ/9600));
401                         break;
402         }
403
404         cp2101_get_config(port, CP2101_BITS, &bits, 2);
405         cflag &= ~CSIZE;
406         switch(bits & BITS_DATA_MASK) {
407                 case BITS_DATA_5:
408                         dbg("%s - data bits = 5", __FUNCTION__);
409                         cflag |= CS5;
410                         break;
411                 case BITS_DATA_6:
412                         dbg("%s - data bits = 6", __FUNCTION__);
413                         cflag |= CS6;
414                         break;
415                 case BITS_DATA_7:
416                         dbg("%s - data bits = 7", __FUNCTION__);
417                         cflag |= CS7;
418                         break;
419                 case BITS_DATA_8:
420                         dbg("%s - data bits = 8", __FUNCTION__);
421                         cflag |= CS8;
422                         break;
423                 case BITS_DATA_9:
424                         dbg("%s - data bits = 9 (not supported, "
425                                         "using 8 data bits)", __FUNCTION__);
426                         cflag |= CS8;
427                         bits &= ~BITS_DATA_MASK;
428                         bits |= BITS_DATA_8;
429                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
430                         break;
431                 default:
432                         dbg("%s - Unknown number of data bits, "
433                                         "using 8", __FUNCTION__);
434                         cflag |= CS8;
435                         bits &= ~BITS_DATA_MASK;
436                         bits |= BITS_DATA_8;
437                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
438                         break;
439         }
440
441         switch(bits & BITS_PARITY_MASK) {
442                 case BITS_PARITY_NONE:
443                         dbg("%s - parity = NONE", __FUNCTION__);
444                         cflag &= ~PARENB;
445                         break;
446                 case BITS_PARITY_ODD:
447                         dbg("%s - parity = ODD", __FUNCTION__);
448                         cflag |= (PARENB|PARODD);
449                         break;
450                 case BITS_PARITY_EVEN:
451                         dbg("%s - parity = EVEN", __FUNCTION__);
452                         cflag &= ~PARODD;
453                         cflag |= PARENB;
454                         break;
455                 case BITS_PARITY_MARK:
456                         dbg("%s - parity = MARK (not supported, "
457                                         "disabling parity)", __FUNCTION__);
458                         cflag &= ~PARENB;
459                         bits &= ~BITS_PARITY_MASK;
460                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
461                         break;
462                 case BITS_PARITY_SPACE:
463                         dbg("%s - parity = SPACE (not supported, "
464                                         "disabling parity)", __FUNCTION__);
465                         cflag &= ~PARENB;
466                         bits &= ~BITS_PARITY_MASK;
467                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
468                         break;
469                 default:
470                         dbg("%s - Unknown parity mode, "
471                                         "disabling parity", __FUNCTION__);
472                         cflag &= ~PARENB;
473                         bits &= ~BITS_PARITY_MASK;
474                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
475                         break;
476         }
477
478         cflag &= ~CSTOPB;
479         switch(bits & BITS_STOP_MASK) {
480                 case BITS_STOP_1:
481                         dbg("%s - stop bits = 1", __FUNCTION__);
482                         break;
483                 case BITS_STOP_1_5:
484                         dbg("%s - stop bits = 1.5 (not supported, "
485                                         "using 1 stop bit)", __FUNCTION__);
486                         bits &= ~BITS_STOP_MASK;
487                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
488                         break;
489                 case BITS_STOP_2:
490                         dbg("%s - stop bits = 2", __FUNCTION__);
491                         cflag |= CSTOPB;
492                         break;
493                 default:
494                         dbg("%s - Unknown number of stop bits, "
495                                         "using 1 stop bit", __FUNCTION__);
496                         bits &= ~BITS_STOP_MASK;
497                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
498                         break;
499         }
500
501         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
502         if (modem_ctl[0] & 0x0008) {
503                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
504                 cflag |= CRTSCTS;
505         } else {
506                 dbg("%s - flow control = NONE", __FUNCTION__);
507                 cflag &= ~CRTSCTS;
508         }
509
510         port->tty->termios->c_cflag = cflag;
511 }
512
513 static void cp2101_set_termios (struct usb_serial_port *port,
514                 struct ktermios *old_termios)
515 {
516         unsigned int cflag, old_cflag=0;
517         int baud=0, bits;
518         unsigned int modem_ctl[4];
519
520         dbg("%s - port %d", __FUNCTION__, port->number);
521
522         if ((!port->tty) || (!port->tty->termios)) {
523                 dbg("%s - no tty structures", __FUNCTION__);
524                 return;
525         }
526         cflag = port->tty->termios->c_cflag;
527
528         /* Check that they really want us to change something */
529         if (old_termios) {
530                 if ((cflag == old_termios->c_cflag) &&
531                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
532                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
533                         dbg("%s - nothing to change...", __FUNCTION__);
534                         return;
535                 }
536
537                 old_cflag = old_termios->c_cflag;
538         }
539
540         /* If the baud rate is to be updated*/
541         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
542                 switch (cflag & CBAUD) {
543                         /*
544                          * The baud rates which are commented out below
545                          * appear to be supported by the device
546                          * but are non-standard
547                          */
548                         case B0:        baud = 0;       break;
549                         case B600:      baud = 600;     break;
550                         case B1200:     baud = 1200;    break;
551                         case B1800:     baud = 1800;    break;
552                         case B2400:     baud = 2400;    break;
553                         case B4800:     baud = 4800;    break;
554                         /*case B7200:   baud = 7200;    break;*/
555                         case B9600:     baud = 9600;    break;
556                         /*ase B14400:   baud = 14400;   break;*/
557                         case B19200:    baud = 19200;   break;
558                         /*case B28800:  baud = 28800;   break;*/
559                         case B38400:    baud = 38400;   break;
560                         /*case B55854:  baud = 55054;   break;*/
561                         case B57600:    baud = 57600;   break;
562                         case B115200:   baud = 115200;  break;
563                         /*case B127117: baud = 127117;  break;*/
564                         case B230400:   baud = 230400;  break;
565                         case B460800:   baud = 460800;  break;
566                         case B921600:   baud = 921600;  break;
567                         /*case B3686400:        baud = 3686400; break;*/
568                         default:
569                                 dev_err(&port->dev, "cp2101 driver does not "
570                                         "support the baudrate requested\n");
571                                 break;
572                 }
573
574                 if (baud) {
575                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
576                                         baud);
577                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
578                                                 (BAUD_RATE_GEN_FREQ / baud)))
579                                 dev_err(&port->dev, "Baud rate requested not "
580                                                 "supported by device\n");
581                 }
582         }
583
584         /* If the number of data bits is to be updated */
585         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
586                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
587                 bits &= ~BITS_DATA_MASK;
588                 switch (cflag & CSIZE) {
589                         case CS5:
590                                 bits |= BITS_DATA_5;
591                                 dbg("%s - data bits = 5", __FUNCTION__);
592                                 break;
593                         case CS6:
594                                 bits |= BITS_DATA_6;
595                                 dbg("%s - data bits = 6", __FUNCTION__);
596                                 break;
597                         case CS7:
598                                 bits |= BITS_DATA_7;
599                                 dbg("%s - data bits = 7", __FUNCTION__);
600                                 break;
601                         case CS8:
602                                 bits |= BITS_DATA_8;
603                                 dbg("%s - data bits = 8", __FUNCTION__);
604                                 break;
605                         /*case CS9:
606                                 bits |= BITS_DATA_9;
607                                 dbg("%s - data bits = 9", __FUNCTION__);
608                                 break;*/
609                         default:
610                                 dev_err(&port->dev, "cp2101 driver does not "
611                                         "support the number of bits requested,"
612                                         " using 8 bit mode\n");
613                                 bits |= BITS_DATA_8;
614                                 break;
615                 }
616                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
617                         dev_err(&port->dev, "Number of data bits requested "
618                                         "not supported by device\n");
619         }
620
621         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
622                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
623                 bits &= ~BITS_PARITY_MASK;
624                 if (cflag & PARENB) {
625                         if (cflag & PARODD) {
626                                 bits |= BITS_PARITY_ODD;
627                                 dbg("%s - parity = ODD", __FUNCTION__);
628                         } else {
629                                 bits |= BITS_PARITY_EVEN;
630                                 dbg("%s - parity = EVEN", __FUNCTION__);
631                         }
632                 }
633                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
634                         dev_err(&port->dev, "Parity mode not supported "
635                                         "by device\n");
636         }
637
638         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
639                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
640                 bits &= ~BITS_STOP_MASK;
641                 if (cflag & CSTOPB) {
642                         bits |= BITS_STOP_2;
643                         dbg("%s - stop bits = 2", __FUNCTION__);
644                 } else {
645                         bits |= BITS_STOP_1;
646                         dbg("%s - stop bits = 1", __FUNCTION__);
647                 }
648                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
649                         dev_err(&port->dev, "Number of stop bits requested "
650                                         "not supported by device\n");
651         }
652
653         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
654                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
655                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
656                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
657                                 modem_ctl[2], modem_ctl[3]);
658
659                 if (cflag & CRTSCTS) {
660                         modem_ctl[0] &= ~0x7B;
661                         modem_ctl[0] |= 0x09;
662                         modem_ctl[1] = 0x80;
663                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
664                 } else {
665                         modem_ctl[0] &= ~0x7B;
666                         modem_ctl[0] |= 0x01;
667                         modem_ctl[1] |= 0x40;
668                         dbg("%s - flow control = NONE", __FUNCTION__);
669                 }
670
671                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
672                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
673                                 modem_ctl[2], modem_ctl[3]);
674                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
675         }
676
677 }
678
679 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
680                 unsigned int set, unsigned int clear)
681 {
682         int control = 0;
683
684         dbg("%s - port %d", __FUNCTION__, port->number);
685
686         if (set & TIOCM_RTS) {
687                 control |= CONTROL_RTS;
688                 control |= CONTROL_WRITE_RTS;
689         }
690         if (set & TIOCM_DTR) {
691                 control |= CONTROL_DTR;
692                 control |= CONTROL_WRITE_DTR;
693         }
694         if (clear & TIOCM_RTS) {
695                 control &= ~CONTROL_RTS;
696                 control |= CONTROL_WRITE_RTS;
697         }
698         if (clear & TIOCM_DTR) {
699                 control &= ~CONTROL_DTR;
700                 control |= CONTROL_WRITE_DTR;
701         }
702
703         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
704
705         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
706
707 }
708
709 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
710 {
711         int control, result;
712
713         dbg("%s - port %d", __FUNCTION__, port->number);
714
715         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
716
717         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
718                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
719                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
720                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
721                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
722                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
723
724         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
725
726         return result;
727 }
728
729 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
730 {
731         int state;
732
733         dbg("%s - port %d", __FUNCTION__, port->number);
734         if (break_state == 0)
735                 state = BREAK_OFF;
736         else
737                 state = BREAK_ON;
738         dbg("%s - turning break %s", __FUNCTION__,
739                         state==BREAK_OFF ? "off" : "on");
740         cp2101_set_config(port, CP2101_BREAK, &state, 2);
741 }
742
743 static int cp2101_startup (struct usb_serial *serial)
744 {
745         /* CP2101 buffers behave strangely unless device is reset */
746         usb_reset_device(serial->dev);
747         return 0;
748 }
749
750 static void cp2101_shutdown (struct usb_serial *serial)
751 {
752         int i;
753
754         dbg("%s", __FUNCTION__);
755
756         /* Stop reads and writes on all ports */
757         for (i=0; i < serial->num_ports; ++i) {
758                 cp2101_cleanup(serial->port[i]);
759         }
760 }
761
762 static int __init cp2101_init (void)
763 {
764         int retval;
765
766         retval = usb_serial_register(&cp2101_device);
767         if (retval)
768                 return retval; /* Failed to register */
769
770         retval = usb_register(&cp2101_driver);
771         if (retval) {
772                 /* Failed to register */
773                 usb_serial_deregister(&cp2101_device);
774                 return retval;
775         }
776
777         /* Success */
778         info(DRIVER_DESC " " DRIVER_VERSION);
779         return 0;
780 }
781
782 static void __exit cp2101_exit (void)
783 {
784         usb_deregister (&cp2101_driver);
785         usb_serial_deregister (&cp2101_device);
786 }
787
788 module_init(cp2101_init);
789 module_exit(cp2101_exit);
790
791 MODULE_DESCRIPTION(DRIVER_DESC);
792 MODULE_VERSION(DRIVER_VERSION);
793 MODULE_LICENSE("GPL");
794
795 module_param(debug, bool, S_IRUGO | S_IWUSR);
796 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");