Merge branch 'linux-2.6' into for-2.6.22
[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, 0x8053) }, /* Enfora EDG1228 */
62         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
63         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
64         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
65         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
66         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
67         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
68         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
69         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
70         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
71         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
72         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
73         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
74         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
75         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
76         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
77         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
78         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
79         { } /* Terminating Entry */
80 };
81
82 MODULE_DEVICE_TABLE (usb, id_table);
83
84 static struct usb_driver cp2101_driver = {
85         .name           = "cp2101",
86         .probe          = usb_serial_probe,
87         .disconnect     = usb_serial_disconnect,
88         .id_table       = id_table,
89         .no_dynamic_id  =       1,
90 };
91
92 static struct usb_serial_driver cp2101_device = {
93         .driver = {
94                 .owner =        THIS_MODULE,
95                 .name =         "cp2101",
96         },
97         .usb_driver             = &cp2101_driver,
98         .id_table               = id_table,
99         .num_interrupt_in       = 0,
100         .num_bulk_in            = 0,
101         .num_bulk_out           = 0,
102         .num_ports              = 1,
103         .open                   = cp2101_open,
104         .close                  = cp2101_close,
105         .break_ctl              = cp2101_break_ctl,
106         .set_termios            = cp2101_set_termios,
107         .tiocmget               = cp2101_tiocmget,
108         .tiocmset               = cp2101_tiocmset,
109         .attach                 = cp2101_startup,
110         .shutdown               = cp2101_shutdown,
111 };
112
113 /* Config request types */
114 #define REQTYPE_HOST_TO_DEVICE  0x41
115 #define REQTYPE_DEVICE_TO_HOST  0xc1
116
117 /* Config SET requests. To GET, add 1 to the request number */
118 #define CP2101_UART             0x00    /* Enable / Disable */
119 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
120 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
121 #define CP2101_BREAK            0x05    /* On / Off */
122 #define CP2101_CONTROL          0x07    /* Flow control line states */
123 #define CP2101_MODEMCTL         0x13    /* Modem controls */
124 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
125
126 /* CP2101_UART */
127 #define UART_ENABLE             0x0001
128 #define UART_DISABLE            0x0000
129
130 /* CP2101_BAUDRATE */
131 #define BAUD_RATE_GEN_FREQ      0x384000
132
133 /* CP2101_BITS */
134 #define BITS_DATA_MASK          0X0f00
135 #define BITS_DATA_5             0X0500
136 #define BITS_DATA_6             0X0600
137 #define BITS_DATA_7             0X0700
138 #define BITS_DATA_8             0X0800
139 #define BITS_DATA_9             0X0900
140
141 #define BITS_PARITY_MASK        0x00f0
142 #define BITS_PARITY_NONE        0x0000
143 #define BITS_PARITY_ODD         0x0010
144 #define BITS_PARITY_EVEN        0x0020
145 #define BITS_PARITY_MARK        0x0030
146 #define BITS_PARITY_SPACE       0x0040
147
148 #define BITS_STOP_MASK          0x000f
149 #define BITS_STOP_1             0x0000
150 #define BITS_STOP_1_5           0x0001
151 #define BITS_STOP_2             0x0002
152
153 /* CP2101_BREAK */
154 #define BREAK_ON                0x0000
155 #define BREAK_OFF               0x0001
156
157 /* CP2101_CONTROL */
158 #define CONTROL_DTR             0x0001
159 #define CONTROL_RTS             0x0002
160 #define CONTROL_CTS             0x0010
161 #define CONTROL_DSR             0x0020
162 #define CONTROL_RING            0x0040
163 #define CONTROL_DCD             0x0080
164 #define CONTROL_WRITE_DTR       0x0100
165 #define CONTROL_WRITE_RTS       0x0200
166
167 /*
168  * cp2101_get_config
169  * Reads from the CP2101 configuration registers
170  * 'size' is specified in bytes.
171  * 'data' is a pointer to a pre-allocated array of integers large
172  * enough to hold 'size' bytes (with 4 bytes to each integer)
173  */
174 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
175                 unsigned int *data, int size)
176 {
177         struct usb_serial *serial = port->serial;
178         __le32 *buf;
179         int result, i, length;
180
181         /* Number of integers required to contain the array */
182         length = (((size - 1) | 3) + 1)/4;
183
184         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
185         if (!buf) {
186                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
187                 return -ENOMEM;
188         }
189
190         /* For get requests, the request number must be incremented */
191         request++;
192
193         /* Issue the request, attempting to read 'size' bytes */
194         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
195                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
196                                 0, buf, size, 300);
197
198         /* Convert data into an array of integers */
199         for (i=0; i<length; i++)
200                 data[i] = le32_to_cpu(buf[i]);
201
202         kfree(buf);
203
204         if (result != size) {
205                 dev_err(&port->dev, "%s - Unable to send config request, "
206                                 "request=0x%x size=%d result=%d\n",
207                                 __FUNCTION__, request, size, result);
208                 return -EPROTO;
209         }
210
211         return 0;
212 }
213
214 /*
215  * cp2101_set_config
216  * Writes to the CP2101 configuration registers
217  * Values less than 16 bits wide are sent directly
218  * 'size' is specified in bytes.
219  */
220 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
221                 unsigned int *data, int size)
222 {
223         struct usb_serial *serial = port->serial;
224         __le32 *buf;
225         int result, i, length;
226
227         /* Number of integers required to contain the array */
228         length = (((size - 1) | 3) + 1)/4;
229
230         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
231         if (!buf) {
232                 dev_err(&port->dev, "%s - out of memory.\n",
233                                 __FUNCTION__);
234                 return -ENOMEM;
235         }
236
237         /* Array of integers into bytes */
238         for (i = 0; i < length; i++)
239                 buf[i] = cpu_to_le32(data[i]);
240
241         if (size > 2) {
242                 result = usb_control_msg (serial->dev,
243                                 usb_sndctrlpipe(serial->dev, 0),
244                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
245                                 0, buf, size, 300);
246         } else {
247                 result = usb_control_msg (serial->dev,
248                                 usb_sndctrlpipe(serial->dev, 0),
249                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
250                                 0, NULL, 0, 300);
251         }
252
253         kfree(buf);
254
255         if ((size > 2 && result != size) || result < 0) {
256                 dev_err(&port->dev, "%s - Unable to send request, "
257                                 "request=0x%x size=%d result=%d\n",
258                                 __FUNCTION__, request, size, result);
259                 return -EPROTO;
260         }
261
262         /* Single data value */
263         result = usb_control_msg (serial->dev,
264                         usb_sndctrlpipe(serial->dev, 0),
265                         request, REQTYPE_HOST_TO_DEVICE, data[0],
266                         0, NULL, 0, 300);
267         return 0;
268 }
269
270 /*
271  * cp2101_set_config_single
272  * Convenience function for calling cp2101_set_config on single data values
273  * without requiring an integer pointer
274  */
275 static inline int cp2101_set_config_single(struct usb_serial_port* port,
276                 u8 request, unsigned int data)
277 {
278         return cp2101_set_config(port, request, &data, 2);
279 }
280
281 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
282 {
283         struct usb_serial *serial = port->serial;
284         int result;
285
286         dbg("%s - port %d", __FUNCTION__, port->number);
287
288         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
289                 dev_err(&port->dev, "%s - Unable to enable UART\n",
290                                 __FUNCTION__);
291                 return -EPROTO;
292         }
293
294         /* Start reading from the device */
295         usb_fill_bulk_urb (port->read_urb, serial->dev,
296                         usb_rcvbulkpipe(serial->dev,
297                         port->bulk_in_endpointAddress),
298                         port->read_urb->transfer_buffer,
299                         port->read_urb->transfer_buffer_length,
300                         serial->type->read_bulk_callback,
301                         port);
302         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
303         if (result) {
304                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
305                                 "error %d\n", __FUNCTION__, result);
306                 return result;
307         }
308
309         /* Configure the termios structure */
310         cp2101_get_termios(port);
311
312         /* Set the DTR and RTS pins low */
313         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
314
315         return 0;
316 }
317
318 static void cp2101_cleanup (struct usb_serial_port *port)
319 {
320         struct usb_serial *serial = port->serial;
321
322         dbg("%s - port %d", __FUNCTION__, port->number);
323
324         if (serial->dev) {
325                 /* shutdown any bulk reads that might be going on */
326                 if (serial->num_bulk_out)
327                         usb_kill_urb(port->write_urb);
328                 if (serial->num_bulk_in)
329                         usb_kill_urb(port->read_urb);
330         }
331 }
332
333 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
334 {
335         dbg("%s - port %d", __FUNCTION__, port->number);
336
337         /* shutdown our urbs */
338         dbg("%s - shutting down urbs", __FUNCTION__);
339         usb_kill_urb(port->write_urb);
340         usb_kill_urb(port->read_urb);
341
342         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
343 }
344
345 /*
346  * cp2101_get_termios
347  * Reads the baud rate, data bits, parity, stop bits and flow control mode
348  * from the device, corrects any unsupported values, and configures the
349  * termios structure to reflect the state of the device
350  */
351 static void cp2101_get_termios (struct usb_serial_port *port)
352 {
353         unsigned int cflag, modem_ctl[4];
354         int baud;
355         int bits;
356
357         dbg("%s - port %d", __FUNCTION__, port->number);
358
359         if ((!port->tty) || (!port->tty->termios)) {
360                 dbg("%s - no tty structures", __FUNCTION__);
361                 return;
362         }
363         cflag = port->tty->termios->c_cflag;
364
365         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
366         /* Convert to baudrate */
367         if (baud)
368                 baud = BAUD_RATE_GEN_FREQ / baud;
369
370         dbg("%s - baud rate = %d", __FUNCTION__, baud);
371         cflag &= ~CBAUD;
372         switch (baud) {
373                 /*
374                  * The baud rates which are commented out below
375                  * appear to be supported by the device
376                  * but are non-standard
377                  */
378                 case 600:       cflag |= B600;          break;
379                 case 1200:      cflag |= B1200;         break;
380                 case 1800:      cflag |= B1800;         break;
381                 case 2400:      cflag |= B2400;         break;
382                 case 4800:      cflag |= B4800;         break;
383                 /*case 7200:    cflag |= B7200;         break;*/
384                 case 9600:      cflag |= B9600;         break;
385                 /*case 14400:   cflag |= B14400;        break;*/
386                 case 19200:     cflag |= B19200;        break;
387                 /*case 28800:   cflag |= B28800;        break;*/
388                 case 38400:     cflag |= B38400;        break;
389                 /*case 55854:   cflag |= B55054;        break;*/
390                 case 57600:     cflag |= B57600;        break;
391                 case 115200:    cflag |= B115200;       break;
392                 /*case 127117:  cflag |= B127117;       break;*/
393                 case 230400:    cflag |= B230400;       break;
394                 case 460800:    cflag |= B460800;       break;
395                 case 921600:    cflag |= B921600;       break;
396                 /*case 3686400: cflag |= B3686400;      break;*/
397                 default:
398                         dbg("%s - Baud rate is not supported, "
399                                         "using 9600 baud", __FUNCTION__);
400                         cflag |= B9600;
401                         cp2101_set_config_single(port, CP2101_BAUDRATE,
402                                         (BAUD_RATE_GEN_FREQ/9600));
403                         break;
404         }
405
406         cp2101_get_config(port, CP2101_BITS, &bits, 2);
407         cflag &= ~CSIZE;
408         switch(bits & BITS_DATA_MASK) {
409                 case BITS_DATA_5:
410                         dbg("%s - data bits = 5", __FUNCTION__);
411                         cflag |= CS5;
412                         break;
413                 case BITS_DATA_6:
414                         dbg("%s - data bits = 6", __FUNCTION__);
415                         cflag |= CS6;
416                         break;
417                 case BITS_DATA_7:
418                         dbg("%s - data bits = 7", __FUNCTION__);
419                         cflag |= CS7;
420                         break;
421                 case BITS_DATA_8:
422                         dbg("%s - data bits = 8", __FUNCTION__);
423                         cflag |= CS8;
424                         break;
425                 case BITS_DATA_9:
426                         dbg("%s - data bits = 9 (not supported, "
427                                         "using 8 data bits)", __FUNCTION__);
428                         cflag |= CS8;
429                         bits &= ~BITS_DATA_MASK;
430                         bits |= BITS_DATA_8;
431                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
432                         break;
433                 default:
434                         dbg("%s - Unknown number of data bits, "
435                                         "using 8", __FUNCTION__);
436                         cflag |= CS8;
437                         bits &= ~BITS_DATA_MASK;
438                         bits |= BITS_DATA_8;
439                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
440                         break;
441         }
442
443         switch(bits & BITS_PARITY_MASK) {
444                 case BITS_PARITY_NONE:
445                         dbg("%s - parity = NONE", __FUNCTION__);
446                         cflag &= ~PARENB;
447                         break;
448                 case BITS_PARITY_ODD:
449                         dbg("%s - parity = ODD", __FUNCTION__);
450                         cflag |= (PARENB|PARODD);
451                         break;
452                 case BITS_PARITY_EVEN:
453                         dbg("%s - parity = EVEN", __FUNCTION__);
454                         cflag &= ~PARODD;
455                         cflag |= PARENB;
456                         break;
457                 case BITS_PARITY_MARK:
458                         dbg("%s - parity = MARK (not supported, "
459                                         "disabling parity)", __FUNCTION__);
460                         cflag &= ~PARENB;
461                         bits &= ~BITS_PARITY_MASK;
462                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
463                         break;
464                 case BITS_PARITY_SPACE:
465                         dbg("%s - parity = SPACE (not supported, "
466                                         "disabling parity)", __FUNCTION__);
467                         cflag &= ~PARENB;
468                         bits &= ~BITS_PARITY_MASK;
469                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
470                         break;
471                 default:
472                         dbg("%s - Unknown parity mode, "
473                                         "disabling parity", __FUNCTION__);
474                         cflag &= ~PARENB;
475                         bits &= ~BITS_PARITY_MASK;
476                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
477                         break;
478         }
479
480         cflag &= ~CSTOPB;
481         switch(bits & BITS_STOP_MASK) {
482                 case BITS_STOP_1:
483                         dbg("%s - stop bits = 1", __FUNCTION__);
484                         break;
485                 case BITS_STOP_1_5:
486                         dbg("%s - stop bits = 1.5 (not supported, "
487                                         "using 1 stop bit)", __FUNCTION__);
488                         bits &= ~BITS_STOP_MASK;
489                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
490                         break;
491                 case BITS_STOP_2:
492                         dbg("%s - stop bits = 2", __FUNCTION__);
493                         cflag |= CSTOPB;
494                         break;
495                 default:
496                         dbg("%s - Unknown number of stop bits, "
497                                         "using 1 stop bit", __FUNCTION__);
498                         bits &= ~BITS_STOP_MASK;
499                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
500                         break;
501         }
502
503         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
504         if (modem_ctl[0] & 0x0008) {
505                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
506                 cflag |= CRTSCTS;
507         } else {
508                 dbg("%s - flow control = NONE", __FUNCTION__);
509                 cflag &= ~CRTSCTS;
510         }
511
512         port->tty->termios->c_cflag = cflag;
513 }
514
515 static void cp2101_set_termios (struct usb_serial_port *port,
516                 struct ktermios *old_termios)
517 {
518         unsigned int cflag, old_cflag=0;
519         int baud=0, bits;
520         unsigned int modem_ctl[4];
521
522         dbg("%s - port %d", __FUNCTION__, port->number);
523
524         if ((!port->tty) || (!port->tty->termios)) {
525                 dbg("%s - no tty structures", __FUNCTION__);
526                 return;
527         }
528         cflag = port->tty->termios->c_cflag;
529
530         /* Check that they really want us to change something */
531         if (old_termios) {
532                 if ((cflag == old_termios->c_cflag) &&
533                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
534                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
535                         dbg("%s - nothing to change...", __FUNCTION__);
536                         return;
537                 }
538
539                 old_cflag = old_termios->c_cflag;
540         }
541
542         /* If the baud rate is to be updated*/
543         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
544                 switch (cflag & CBAUD) {
545                         /*
546                          * The baud rates which are commented out below
547                          * appear to be supported by the device
548                          * but are non-standard
549                          */
550                         case B0:        baud = 0;       break;
551                         case B600:      baud = 600;     break;
552                         case B1200:     baud = 1200;    break;
553                         case B1800:     baud = 1800;    break;
554                         case B2400:     baud = 2400;    break;
555                         case B4800:     baud = 4800;    break;
556                         /*case B7200:   baud = 7200;    break;*/
557                         case B9600:     baud = 9600;    break;
558                         /*ase B14400:   baud = 14400;   break;*/
559                         case B19200:    baud = 19200;   break;
560                         /*case B28800:  baud = 28800;   break;*/
561                         case B38400:    baud = 38400;   break;
562                         /*case B55854:  baud = 55054;   break;*/
563                         case B57600:    baud = 57600;   break;
564                         case B115200:   baud = 115200;  break;
565                         /*case B127117: baud = 127117;  break;*/
566                         case B230400:   baud = 230400;  break;
567                         case B460800:   baud = 460800;  break;
568                         case B921600:   baud = 921600;  break;
569                         /*case B3686400:        baud = 3686400; break;*/
570                         default:
571                                 dev_err(&port->dev, "cp2101 driver does not "
572                                         "support the baudrate requested\n");
573                                 break;
574                 }
575
576                 if (baud) {
577                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
578                                         baud);
579                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
580                                                 (BAUD_RATE_GEN_FREQ / baud)))
581                                 dev_err(&port->dev, "Baud rate requested not "
582                                                 "supported by device\n");
583                 }
584         }
585
586         /* If the number of data bits is to be updated */
587         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
588                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
589                 bits &= ~BITS_DATA_MASK;
590                 switch (cflag & CSIZE) {
591                         case CS5:
592                                 bits |= BITS_DATA_5;
593                                 dbg("%s - data bits = 5", __FUNCTION__);
594                                 break;
595                         case CS6:
596                                 bits |= BITS_DATA_6;
597                                 dbg("%s - data bits = 6", __FUNCTION__);
598                                 break;
599                         case CS7:
600                                 bits |= BITS_DATA_7;
601                                 dbg("%s - data bits = 7", __FUNCTION__);
602                                 break;
603                         case CS8:
604                                 bits |= BITS_DATA_8;
605                                 dbg("%s - data bits = 8", __FUNCTION__);
606                                 break;
607                         /*case CS9:
608                                 bits |= BITS_DATA_9;
609                                 dbg("%s - data bits = 9", __FUNCTION__);
610                                 break;*/
611                         default:
612                                 dev_err(&port->dev, "cp2101 driver does not "
613                                         "support the number of bits requested,"
614                                         " using 8 bit mode\n");
615                                 bits |= BITS_DATA_8;
616                                 break;
617                 }
618                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
619                         dev_err(&port->dev, "Number of data bits requested "
620                                         "not supported by device\n");
621         }
622
623         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
624                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
625                 bits &= ~BITS_PARITY_MASK;
626                 if (cflag & PARENB) {
627                         if (cflag & PARODD) {
628                                 bits |= BITS_PARITY_ODD;
629                                 dbg("%s - parity = ODD", __FUNCTION__);
630                         } else {
631                                 bits |= BITS_PARITY_EVEN;
632                                 dbg("%s - parity = EVEN", __FUNCTION__);
633                         }
634                 }
635                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
636                         dev_err(&port->dev, "Parity mode not supported "
637                                         "by device\n");
638         }
639
640         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
641                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
642                 bits &= ~BITS_STOP_MASK;
643                 if (cflag & CSTOPB) {
644                         bits |= BITS_STOP_2;
645                         dbg("%s - stop bits = 2", __FUNCTION__);
646                 } else {
647                         bits |= BITS_STOP_1;
648                         dbg("%s - stop bits = 1", __FUNCTION__);
649                 }
650                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
651                         dev_err(&port->dev, "Number of stop bits requested "
652                                         "not supported by device\n");
653         }
654
655         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
656                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
657                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
658                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
659                                 modem_ctl[2], modem_ctl[3]);
660
661                 if (cflag & CRTSCTS) {
662                         modem_ctl[0] &= ~0x7B;
663                         modem_ctl[0] |= 0x09;
664                         modem_ctl[1] = 0x80;
665                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
666                 } else {
667                         modem_ctl[0] &= ~0x7B;
668                         modem_ctl[0] |= 0x01;
669                         modem_ctl[1] |= 0x40;
670                         dbg("%s - flow control = NONE", __FUNCTION__);
671                 }
672
673                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
674                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
675                                 modem_ctl[2], modem_ctl[3]);
676                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
677         }
678
679 }
680
681 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
682                 unsigned int set, unsigned int clear)
683 {
684         int control = 0;
685
686         dbg("%s - port %d", __FUNCTION__, port->number);
687
688         if (set & TIOCM_RTS) {
689                 control |= CONTROL_RTS;
690                 control |= CONTROL_WRITE_RTS;
691         }
692         if (set & TIOCM_DTR) {
693                 control |= CONTROL_DTR;
694                 control |= CONTROL_WRITE_DTR;
695         }
696         if (clear & TIOCM_RTS) {
697                 control &= ~CONTROL_RTS;
698                 control |= CONTROL_WRITE_RTS;
699         }
700         if (clear & TIOCM_DTR) {
701                 control &= ~CONTROL_DTR;
702                 control |= CONTROL_WRITE_DTR;
703         }
704
705         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
706
707         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
708
709 }
710
711 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
712 {
713         int control, result;
714
715         dbg("%s - port %d", __FUNCTION__, port->number);
716
717         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
718
719         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
720                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
721                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
722                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
723                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
724                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
725
726         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
727
728         return result;
729 }
730
731 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
732 {
733         int state;
734
735         dbg("%s - port %d", __FUNCTION__, port->number);
736         if (break_state == 0)
737                 state = BREAK_OFF;
738         else
739                 state = BREAK_ON;
740         dbg("%s - turning break %s", __FUNCTION__,
741                         state==BREAK_OFF ? "off" : "on");
742         cp2101_set_config(port, CP2101_BREAK, &state, 2);
743 }
744
745 static int cp2101_startup (struct usb_serial *serial)
746 {
747         /* CP2101 buffers behave strangely unless device is reset */
748         usb_reset_device(serial->dev);
749         return 0;
750 }
751
752 static void cp2101_shutdown (struct usb_serial *serial)
753 {
754         int i;
755
756         dbg("%s", __FUNCTION__);
757
758         /* Stop reads and writes on all ports */
759         for (i=0; i < serial->num_ports; ++i) {
760                 cp2101_cleanup(serial->port[i]);
761         }
762 }
763
764 static int __init cp2101_init (void)
765 {
766         int retval;
767
768         retval = usb_serial_register(&cp2101_device);
769         if (retval)
770                 return retval; /* Failed to register */
771
772         retval = usb_register(&cp2101_driver);
773         if (retval) {
774                 /* Failed to register */
775                 usb_serial_deregister(&cp2101_device);
776                 return retval;
777         }
778
779         /* Success */
780         info(DRIVER_DESC " " DRIVER_VERSION);
781         return 0;
782 }
783
784 static void __exit cp2101_exit (void)
785 {
786         usb_deregister (&cp2101_driver);
787         usb_serial_deregister (&cp2101_device);
788 }
789
790 module_init(cp2101_init);
791 module_exit(cp2101_exit);
792
793 MODULE_DESCRIPTION(DRIVER_DESC);
794 MODULE_VERSION(DRIVER_VERSION);
795 MODULE_LICENSE("GPL");
796
797 module_param(debug, bool, S_IRUGO | S_IWUSR);
798 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");