Merge master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
[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/config.h>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/slab.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/usb.h>
29 #include <asm/uaccess.h>
30 #include "usb-serial.h"
31
32 /*
33  * Version Information
34  */
35 #define DRIVER_VERSION "v0.05"
36 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
37
38 /*
39  * Function Prototypes
40  */
41 static int cp2101_open(struct usb_serial_port*, struct file*);
42 static void cp2101_cleanup(struct usb_serial_port*);
43 static void cp2101_close(struct usb_serial_port*, struct file*);
44 static void cp2101_get_termios(struct usb_serial_port*);
45 static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
46 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
47 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
48                 unsigned int, unsigned int);
49 static void cp2101_break_ctl(struct usb_serial_port*, int);
50 static int cp2101_startup (struct usb_serial *);
51 static void cp2101_shutdown(struct usb_serial*);
52
53
54 static int debug;
55
56 static struct usb_device_id id_table [] = {
57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
58         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
59         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
60         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
63         { } /* Terminating Entry */
64 };
65
66 MODULE_DEVICE_TABLE (usb, id_table);
67
68 static struct usb_driver cp2101_driver = {
69         .owner          = THIS_MODULE,
70         .name           = "CP2101",
71         .probe          = usb_serial_probe,
72         .disconnect     = usb_serial_disconnect,
73         .id_table       = id_table,
74 };
75
76 static struct usb_serial_device_type cp2101_device = {
77         .owner                  = THIS_MODULE,
78         .name                   = "CP2101",
79         .id_table               = id_table,
80         .num_interrupt_in       = 0,
81         .num_bulk_in            = 0,
82         .num_bulk_out           = 0,
83         .num_ports              = 1,
84         .open                   = cp2101_open,
85         .close                  = cp2101_close,
86         .break_ctl              = cp2101_break_ctl,
87         .set_termios            = cp2101_set_termios,
88         .tiocmget               = cp2101_tiocmget,
89         .tiocmset               = cp2101_tiocmset,
90         .attach                 = cp2101_startup,
91         .shutdown               = cp2101_shutdown,
92 };
93
94 /* Config request types */
95 #define REQTYPE_HOST_TO_DEVICE  0x41
96 #define REQTYPE_DEVICE_TO_HOST  0xc1
97
98 /* Config SET requests. To GET, add 1 to the request number */
99 #define CP2101_UART             0x00    /* Enable / Disable */
100 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
101 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
102 #define CP2101_BREAK            0x05    /* On / Off */
103 #define CP2101_CONTROL          0x07    /* Flow control line states */
104 #define CP2101_MODEMCTL         0x13    /* Modem controls */
105 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
106
107 /* CP2101_UART */
108 #define UART_ENABLE             0x0001
109 #define UART_DISABLE            0x0000
110
111 /* CP2101_BAUDRATE */
112 #define BAUD_RATE_GEN_FREQ      0x384000
113
114 /* CP2101_BITS */
115 #define BITS_DATA_MASK          0X0f00
116 #define BITS_DATA_5             0X0500
117 #define BITS_DATA_6             0X0600
118 #define BITS_DATA_7             0X0700
119 #define BITS_DATA_8             0X0800
120 #define BITS_DATA_9             0X0900
121
122 #define BITS_PARITY_MASK        0x00f0
123 #define BITS_PARITY_NONE        0x0000
124 #define BITS_PARITY_ODD         0x0010
125 #define BITS_PARITY_EVEN        0x0020
126 #define BITS_PARITY_MARK        0x0030
127 #define BITS_PARITY_SPACE       0x0040
128
129 #define BITS_STOP_MASK          0x000f
130 #define BITS_STOP_1             0x0000
131 #define BITS_STOP_1_5           0x0001
132 #define BITS_STOP_2             0x0002
133
134 /* CP2101_BREAK */
135 #define BREAK_ON                0x0000
136 #define BREAK_OFF               0x0001
137
138 /* CP2101_CONTROL */
139 #define CONTROL_DTR             0x0001
140 #define CONTROL_RTS             0x0002
141 #define CONTROL_CTS             0x0010
142 #define CONTROL_DSR             0x0020
143 #define CONTROL_RING            0x0040
144 #define CONTROL_DCD             0x0080
145 #define CONTROL_WRITE_DTR       0x0100
146 #define CONTROL_WRITE_RTS       0x0200
147
148 /*
149  * cp2101_get_config
150  * Reads from the CP2101 configuration registers
151  * 'size' is specified in bytes.
152  * 'data' is a pointer to a pre-allocated array of integers large
153  * enough to hold 'size' bytes (with 4 bytes to each integer)
154  */
155 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
156                 unsigned int *data, int size)
157 {
158         struct usb_serial *serial = port->serial;
159         u32 *buf;
160         int result, i, length;
161
162         /* Number of integers required to contain the array */
163         length = (((size - 1) | 3) + 1)/4;
164
165         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
166         memset(buf, 0, length * sizeof(u32));
167
168         if (!buf) {
169                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
170                 return -ENOMEM;
171         }
172
173         /* For get requests, the request number must be incremented */
174         request++;
175
176         /* Issue the request, attempting to read 'size' bytes */
177         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
178                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
179                                 0, buf, size, 300);
180
181         /* Convert data into an array of integers */
182         for (i=0; i<length; i++)
183                 data[i] = le32_to_cpu(buf[i]);
184
185         kfree(buf);
186
187         if (result != size) {
188                 dev_err(&port->dev, "%s - Unable to send config request, "
189                                 "request=0x%x size=%d result=%d\n",
190                                 __FUNCTION__, request, size, result);
191                 return -EPROTO;
192         }
193
194         return 0;
195 }
196
197 /*
198  * cp2101_set_config
199  * Writes to the CP2101 configuration registers
200  * Values less than 16 bits wide are sent directly
201  * 'size' is specified in bytes.
202  */
203 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
204                 unsigned int *data, int size)
205 {
206         struct usb_serial *serial = port->serial;
207         u32 *buf;
208         int result, i, length;
209
210         /* Number of integers required to contain the array */
211         length = (((size - 1) | 3) + 1)/4;
212
213         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
214         if (!buf) {
215                 dev_err(&port->dev, "%s - out of memory.\n",
216                                 __FUNCTION__);
217                 return -ENOMEM;
218         }
219
220         /* Array of integers into bytes */
221         for (i = 0; i < length; i++)
222                 buf[i] = cpu_to_le32(data[i]);
223
224         if (size > 2) {
225                 result = usb_control_msg (serial->dev,
226                                 usb_sndctrlpipe(serial->dev, 0),
227                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
228                                 0, buf, size, 300);
229         } else {
230                 result = usb_control_msg (serial->dev,
231                                 usb_sndctrlpipe(serial->dev, 0),
232                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
233                                 0, NULL, 0, 300);
234         }
235
236         kfree(buf);
237
238         if ((size > 2 && result != size) || result < 0) {
239                 dev_err(&port->dev, "%s - Unable to send request, "
240                                 "request=0x%x size=%d result=%d\n",
241                                 __FUNCTION__, request, size, result);
242                 return -EPROTO;
243         }
244
245         /* Single data value */
246         result = usb_control_msg (serial->dev,
247                         usb_sndctrlpipe(serial->dev, 0),
248                         request, REQTYPE_HOST_TO_DEVICE, data[0],
249                         0, NULL, 0, 300);
250         return 0;
251 }
252
253 /*
254  * cp2101_set_config_single
255  * Convenience function for calling cp2101_set_config on single data values
256  * without requiring an integer pointer
257  */
258 static inline int cp2101_set_config_single(struct usb_serial_port* port,
259                 u8 request, unsigned int data)
260 {
261         return cp2101_set_config(port, request, &data, 2);
262 }
263
264 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
265 {
266         struct usb_serial *serial = port->serial;
267         int result;
268
269         dbg("%s - port %d", __FUNCTION__, port->number);
270
271         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
272                 dev_err(&port->dev, "%s - Unable to enable UART\n",
273                                 __FUNCTION__);
274                 return -EPROTO;
275         }
276
277         /* Start reading from the device */
278         usb_fill_bulk_urb (port->read_urb, serial->dev,
279                         usb_rcvbulkpipe(serial->dev,
280                         port->bulk_in_endpointAddress),
281                         port->read_urb->transfer_buffer,
282                         port->read_urb->transfer_buffer_length,
283                         serial->type->read_bulk_callback,
284                         port);
285         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
286         if (result) {
287                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
288                                 "error %d\n", __FUNCTION__, result);
289                 return result;
290         }
291
292         /* Configure the termios structure */
293         cp2101_get_termios(port);
294
295         /* Set the DTR and RTS pins low */
296         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
297
298         return 0;
299 }
300
301 static void cp2101_cleanup (struct usb_serial_port *port)
302 {
303         struct usb_serial *serial = port->serial;
304
305         dbg("%s - port %d", __FUNCTION__, port->number);
306
307         if (serial->dev) {
308                 /* shutdown any bulk reads that might be going on */
309                 if (serial->num_bulk_out)
310                         usb_kill_urb(port->write_urb);
311                 if (serial->num_bulk_in)
312                         usb_kill_urb(port->read_urb);
313         }
314 }
315
316 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
317 {
318         dbg("%s - port %d", __FUNCTION__, port->number);
319
320         /* shutdown our urbs */
321         dbg("%s - shutting down urbs", __FUNCTION__);
322         usb_kill_urb(port->write_urb);
323         usb_kill_urb(port->read_urb);
324
325         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
326 }
327
328 /*
329  * cp2101_get_termios
330  * Reads the baud rate, data bits, parity, stop bits and flow control mode
331  * from the device, corrects any unsupported values, and configures the
332  * termios structure to reflect the state of the device
333  */
334 static void cp2101_get_termios (struct usb_serial_port *port)
335 {
336         unsigned int cflag, modem_ctl[4];
337         int baud;
338         int bits;
339
340         dbg("%s - port %d", __FUNCTION__, port->number);
341
342         if ((!port->tty) || (!port->tty->termios)) {
343                 dbg("%s - no tty structures", __FUNCTION__);
344                 return;
345         }
346         cflag = port->tty->termios->c_cflag;
347
348         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
349         /* Convert to baudrate */
350         if (baud)
351                 baud = BAUD_RATE_GEN_FREQ / baud;
352
353         dbg("%s - baud rate = %d", __FUNCTION__, baud);
354         cflag &= ~CBAUD;
355         switch (baud) {
356                 /*
357                  * The baud rates which are commented out below
358                  * appear to be supported by the device
359                  * but are non-standard
360                  */
361                 case 600:       cflag |= B600;          break;
362                 case 1200:      cflag |= B1200;         break;
363                 case 1800:      cflag |= B1800;         break;
364                 case 2400:      cflag |= B2400;         break;
365                 case 4800:      cflag |= B4800;         break;
366                 /*case 7200:    cflag |= B7200;         break;*/
367                 case 9600:      cflag |= B9600;         break;
368                 /*case 14400:   cflag |= B14400;        break;*/
369                 case 19200:     cflag |= B19200;        break;
370                 /*case 28800:   cflag |= B28800;        break;*/
371                 case 38400:     cflag |= B38400;        break;
372                 /*case 55854:   cflag |= B55054;        break;*/
373                 case 57600:     cflag |= B57600;        break;
374                 case 115200:    cflag |= B115200;       break;
375                 /*case 127117:  cflag |= B127117;       break;*/
376                 case 230400:    cflag |= B230400;       break;
377                 case 460800:    cflag |= B460800;       break;
378                 case 921600:    cflag |= B921600;       break;
379                 /*case 3686400: cflag |= B3686400;      break;*/
380                 default:
381                         dbg("%s - Baud rate is not supported, "
382                                         "using 9600 baud", __FUNCTION__);
383                         cflag |= B9600;
384                         cp2101_set_config_single(port, CP2101_BAUDRATE,
385                                         (BAUD_RATE_GEN_FREQ/9600));
386                         break;
387         }
388
389         cp2101_get_config(port, CP2101_BITS, &bits, 2);
390         cflag &= ~CSIZE;
391         switch(bits & BITS_DATA_MASK) {
392                 case BITS_DATA_5:
393                         dbg("%s - data bits = 5", __FUNCTION__);
394                         cflag |= CS5;
395                         break;
396                 case BITS_DATA_6:
397                         dbg("%s - data bits = 6", __FUNCTION__);
398                         cflag |= CS6;
399                         break;
400                 case BITS_DATA_7:
401                         dbg("%s - data bits = 7", __FUNCTION__);
402                         cflag |= CS7;
403                         break;
404                 case BITS_DATA_8:
405                         dbg("%s - data bits = 8", __FUNCTION__);
406                         cflag |= CS8;
407                         break;
408                 case BITS_DATA_9:
409                         dbg("%s - data bits = 9 (not supported, "
410                                         "using 8 data bits)", __FUNCTION__);
411                         cflag |= CS8;
412                         bits &= ~BITS_DATA_MASK;
413                         bits |= BITS_DATA_8;
414                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
415                         break;
416                 default:
417                         dbg("%s - Unknown number of data bits, "
418                                         "using 8", __FUNCTION__);
419                         cflag |= CS8;
420                         bits &= ~BITS_DATA_MASK;
421                         bits |= BITS_DATA_8;
422                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
423                         break;
424         }
425
426         switch(bits & BITS_PARITY_MASK) {
427                 case BITS_PARITY_NONE:
428                         dbg("%s - parity = NONE", __FUNCTION__);
429                         cflag &= ~PARENB;
430                         break;
431                 case BITS_PARITY_ODD:
432                         dbg("%s - parity = ODD", __FUNCTION__);
433                         cflag |= (PARENB|PARODD);
434                         break;
435                 case BITS_PARITY_EVEN:
436                         dbg("%s - parity = EVEN", __FUNCTION__);
437                         cflag &= ~PARODD;
438                         cflag |= PARENB;
439                         break;
440                 case BITS_PARITY_MARK:
441                         dbg("%s - parity = MARK (not supported, "
442                                         "disabling parity)", __FUNCTION__);
443                         cflag &= ~PARENB;
444                         bits &= ~BITS_PARITY_MASK;
445                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
446                         break;
447                 case BITS_PARITY_SPACE:
448                         dbg("%s - parity = SPACE (not supported, "
449                                         "disabling parity)", __FUNCTION__);
450                         cflag &= ~PARENB;
451                         bits &= ~BITS_PARITY_MASK;
452                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
453                         break;
454                 default:
455                         dbg("%s - Unknown parity mode, "
456                                         "disabling parity", __FUNCTION__);
457                         cflag &= ~PARENB;
458                         bits &= ~BITS_PARITY_MASK;
459                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
460                         break;
461         }
462
463         cflag &= ~CSTOPB;
464         switch(bits & BITS_STOP_MASK) {
465                 case BITS_STOP_1:
466                         dbg("%s - stop bits = 1", __FUNCTION__);
467                         break;
468                 case BITS_STOP_1_5:
469                         dbg("%s - stop bits = 1.5 (not supported, "
470                                         "using 1 stop bit)", __FUNCTION__);
471                         bits &= ~BITS_STOP_MASK;
472                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
473                         break;
474                 case BITS_STOP_2:
475                         dbg("%s - stop bits = 2", __FUNCTION__);
476                         cflag |= CSTOPB;
477                         break;
478                 default:
479                         dbg("%s - Unknown number of stop bits, "
480                                         "using 1 stop bit", __FUNCTION__);
481                         bits &= ~BITS_STOP_MASK;
482                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
483                         break;
484         }
485
486         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
487         if (modem_ctl[0] & 0x0008) {
488                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
489                 cflag |= CRTSCTS;
490         } else {
491                 dbg("%s - flow control = NONE", __FUNCTION__);
492                 cflag &= ~CRTSCTS;
493         }
494
495         port->tty->termios->c_cflag = cflag;
496 }
497
498 static void cp2101_set_termios (struct usb_serial_port *port,
499                 struct termios *old_termios)
500 {
501         unsigned int cflag, old_cflag=0;
502         int baud=0, bits;
503         unsigned int modem_ctl[4];
504
505         dbg("%s - port %d", __FUNCTION__, port->number);
506
507         if ((!port->tty) || (!port->tty->termios)) {
508                 dbg("%s - no tty structures", __FUNCTION__);
509                 return;
510         }
511         cflag = port->tty->termios->c_cflag;
512
513         /* Check that they really want us to change something */
514         if (old_termios) {
515                 if ((cflag == old_termios->c_cflag) &&
516                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
517                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
518                         dbg("%s - nothing to change...", __FUNCTION__);
519                         return;
520                 }
521
522                 old_cflag = old_termios->c_cflag;
523         }
524
525         /* If the baud rate is to be updated*/
526         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
527                 switch (cflag & CBAUD) {
528                         /*
529                          * The baud rates which are commented out below
530                          * appear to be supported by the device
531                          * but are non-standard
532                          */
533                         case B0:        baud = 0;       break;
534                         case B600:      baud = 600;     break;
535                         case B1200:     baud = 1200;    break;
536                         case B1800:     baud = 1800;    break;
537                         case B2400:     baud = 2400;    break;
538                         case B4800:     baud = 4800;    break;
539                         /*case B7200:   baud = 7200;    break;*/
540                         case B9600:     baud = 9600;    break;
541                         /*ase B14400:   baud = 14400;   break;*/
542                         case B19200:    baud = 19200;   break;
543                         /*case B28800:  baud = 28800;   break;*/
544                         case B38400:    baud = 38400;   break;
545                         /*case B55854:  baud = 55054;   break;*/
546                         case B57600:    baud = 57600;   break;
547                         case B115200:   baud = 115200;  break;
548                         /*case B127117: baud = 127117;  break;*/
549                         case B230400:   baud = 230400;  break;
550                         case B460800:   baud = 460800;  break;
551                         case B921600:   baud = 921600;  break;
552                         /*case B3686400:        baud = 3686400; break;*/
553                         default:
554                                 dev_err(&port->dev, "cp2101 driver does not "
555                                         "support the baudrate requested\n");
556                                 break;
557                 }
558
559                 if (baud) {
560                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
561                                         baud);
562                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
563                                                 (BAUD_RATE_GEN_FREQ / baud)))
564                                 dev_err(&port->dev, "Baud rate requested not "
565                                                 "supported by device\n");
566                 }
567         }
568
569         /* If the number of data bits is to be updated */
570         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
571                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
572                 bits &= ~BITS_DATA_MASK;
573                 switch (cflag & CSIZE) {
574                         case CS5:
575                                 bits |= BITS_DATA_5;
576                                 dbg("%s - data bits = 5", __FUNCTION__);
577                                 break;
578                         case CS6:
579                                 bits |= BITS_DATA_6;
580                                 dbg("%s - data bits = 6", __FUNCTION__);
581                                 break;
582                         case CS7:
583                                 bits |= BITS_DATA_7;
584                                 dbg("%s - data bits = 7", __FUNCTION__);
585                                 break;
586                         case CS8:
587                                 bits |= BITS_DATA_8;
588                                 dbg("%s - data bits = 8", __FUNCTION__);
589                                 break;
590                         /*case CS9:
591                                 bits |= BITS_DATA_9;
592                                 dbg("%s - data bits = 9", __FUNCTION__);
593                                 break;*/
594                         default:
595                                 dev_err(&port->dev, "cp2101 driver does not "
596                                         "support the number of bits requested,"
597                                         " using 8 bit mode\n");
598                                 bits |= BITS_DATA_8;
599                                 break;
600                 }
601                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
602                         dev_err(&port->dev, "Number of data bits requested "
603                                         "not supported by device\n");
604         }
605
606         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
607                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
608                 bits &= ~BITS_PARITY_MASK;
609                 if (cflag & PARENB) {
610                         if (cflag & PARODD) {
611                                 bits |= BITS_PARITY_ODD;
612                                 dbg("%s - parity = ODD", __FUNCTION__);
613                         } else {
614                                 bits |= BITS_PARITY_EVEN;
615                                 dbg("%s - parity = EVEN", __FUNCTION__);
616                         }
617                 }
618                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
619                         dev_err(&port->dev, "Parity mode not supported "
620                                         "by device\n");
621         }
622
623         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
624                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
625                 bits &= ~BITS_STOP_MASK;
626                 if (cflag & CSTOPB) {
627                         bits |= BITS_STOP_2;
628                         dbg("%s - stop bits = 2", __FUNCTION__);
629                 } else {
630                         bits |= BITS_STOP_1;
631                         dbg("%s - stop bits = 1", __FUNCTION__);
632                 }
633                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
634                         dev_err(&port->dev, "Number of stop bits requested "
635                                         "not supported by device\n");
636         }
637
638         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
639                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
640                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
641                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
642                                 modem_ctl[2], modem_ctl[3]);
643
644                 if (cflag & CRTSCTS) {
645                         modem_ctl[0] &= ~0x7B;
646                         modem_ctl[0] |= 0x09;
647                         modem_ctl[1] = 0x80;
648                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
649                 } else {
650                         modem_ctl[0] &= ~0x7B;
651                         modem_ctl[0] |= 0x01;
652                         modem_ctl[1] |= 0x40;
653                         dbg("%s - flow control = NONE", __FUNCTION__);
654                 }
655
656                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
657                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
658                                 modem_ctl[2], modem_ctl[3]);
659                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
660         }
661
662 }
663
664 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
665                 unsigned int set, unsigned int clear)
666 {
667         int control = 0;
668
669         dbg("%s - port %d", __FUNCTION__, port->number);
670
671         if (set & TIOCM_RTS) {
672                 control |= CONTROL_RTS;
673                 control |= CONTROL_WRITE_RTS;
674         }
675         if (set & TIOCM_DTR) {
676                 control |= CONTROL_DTR;
677                 control |= CONTROL_WRITE_DTR;
678         }
679         if (clear & TIOCM_RTS) {
680                 control &= ~CONTROL_RTS;
681                 control |= CONTROL_WRITE_RTS;
682         }
683         if (clear & TIOCM_DTR) {
684                 control &= ~CONTROL_DTR;
685                 control |= CONTROL_WRITE_DTR;
686         }
687
688         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
689
690         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
691
692 }
693
694 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
695 {
696         int control, result;
697
698         dbg("%s - port %d", __FUNCTION__, port->number);
699
700         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
701
702         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
703                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
704                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
705                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
706                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
707                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
708
709         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
710
711         return result;
712 }
713
714 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
715 {
716         int state;
717
718         dbg("%s - port %d", __FUNCTION__, port->number);
719         if (break_state == 0)
720                 state = BREAK_OFF;
721         else
722                 state = BREAK_ON;
723         dbg("%s - turning break %s", __FUNCTION__,
724                         state==BREAK_OFF ? "off" : "on");
725         cp2101_set_config(port, CP2101_BREAK, &state, 2);
726 }
727
728 static int cp2101_startup (struct usb_serial *serial)
729 {
730         /* CP2101 buffers behave strangely unless device is reset */
731         usb_reset_device(serial->dev);
732         return 0;
733 }
734
735 static void cp2101_shutdown (struct usb_serial *serial)
736 {
737         int i;
738
739         dbg("%s", __FUNCTION__);
740
741         /* Stop reads and writes on all ports */
742         for (i=0; i < serial->num_ports; ++i) {
743                 cp2101_cleanup(serial->port[i]);
744         }
745 }
746
747 static int __init cp2101_init (void)
748 {
749         int retval;
750
751         retval = usb_serial_register(&cp2101_device);
752         if (retval)
753                 return retval; /* Failed to register */
754
755         retval = usb_register(&cp2101_driver);
756         if (retval) {
757                 /* Failed to register */
758                 usb_serial_deregister(&cp2101_device);
759                 return retval;
760         }
761
762         /* Success */
763         info(DRIVER_DESC " " DRIVER_VERSION);
764         return 0;
765 }
766
767 static void __exit cp2101_exit (void)
768 {
769         usb_deregister (&cp2101_driver);
770         usb_serial_deregister (&cp2101_device);
771 }
772
773 module_init(cp2101_init);
774 module_exit(cp2101_exit);
775
776 MODULE_DESCRIPTION(DRIVER_DESC);
777 MODULE_VERSION(DRIVER_VERSION);
778 MODULE_LICENSE("GPL");
779
780 module_param(debug, bool, S_IRUGO | S_IWUSR);
781 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");