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