Merge branch 'master'
[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 "v0.07"
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(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
59         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
60         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
61         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
66         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
67         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
68         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
69         { } /* Terminating Entry */
70 };
71
72 MODULE_DEVICE_TABLE (usb, id_table);
73
74 static struct usb_driver cp2101_driver = {
75         .name           = "cp2101",
76         .probe          = usb_serial_probe,
77         .disconnect     = usb_serial_disconnect,
78         .id_table       = id_table,
79         .no_dynamic_id  =       1,
80 };
81
82 static struct usb_serial_driver cp2101_device = {
83         .driver = {
84                 .owner =        THIS_MODULE,
85                 .name =         "cp2101",
86         },
87         .id_table               = id_table,
88         .num_interrupt_in       = 0,
89         .num_bulk_in            = 0,
90         .num_bulk_out           = 0,
91         .num_ports              = 1,
92         .open                   = cp2101_open,
93         .close                  = cp2101_close,
94         .break_ctl              = cp2101_break_ctl,
95         .set_termios            = cp2101_set_termios,
96         .tiocmget               = cp2101_tiocmget,
97         .tiocmset               = cp2101_tiocmset,
98         .attach                 = cp2101_startup,
99         .shutdown               = cp2101_shutdown,
100 };
101
102 /* Config request types */
103 #define REQTYPE_HOST_TO_DEVICE  0x41
104 #define REQTYPE_DEVICE_TO_HOST  0xc1
105
106 /* Config SET requests. To GET, add 1 to the request number */
107 #define CP2101_UART             0x00    /* Enable / Disable */
108 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
109 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
110 #define CP2101_BREAK            0x05    /* On / Off */
111 #define CP2101_CONTROL          0x07    /* Flow control line states */
112 #define CP2101_MODEMCTL         0x13    /* Modem controls */
113 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
114
115 /* CP2101_UART */
116 #define UART_ENABLE             0x0001
117 #define UART_DISABLE            0x0000
118
119 /* CP2101_BAUDRATE */
120 #define BAUD_RATE_GEN_FREQ      0x384000
121
122 /* CP2101_BITS */
123 #define BITS_DATA_MASK          0X0f00
124 #define BITS_DATA_5             0X0500
125 #define BITS_DATA_6             0X0600
126 #define BITS_DATA_7             0X0700
127 #define BITS_DATA_8             0X0800
128 #define BITS_DATA_9             0X0900
129
130 #define BITS_PARITY_MASK        0x00f0
131 #define BITS_PARITY_NONE        0x0000
132 #define BITS_PARITY_ODD         0x0010
133 #define BITS_PARITY_EVEN        0x0020
134 #define BITS_PARITY_MARK        0x0030
135 #define BITS_PARITY_SPACE       0x0040
136
137 #define BITS_STOP_MASK          0x000f
138 #define BITS_STOP_1             0x0000
139 #define BITS_STOP_1_5           0x0001
140 #define BITS_STOP_2             0x0002
141
142 /* CP2101_BREAK */
143 #define BREAK_ON                0x0000
144 #define BREAK_OFF               0x0001
145
146 /* CP2101_CONTROL */
147 #define CONTROL_DTR             0x0001
148 #define CONTROL_RTS             0x0002
149 #define CONTROL_CTS             0x0010
150 #define CONTROL_DSR             0x0020
151 #define CONTROL_RING            0x0040
152 #define CONTROL_DCD             0x0080
153 #define CONTROL_WRITE_DTR       0x0100
154 #define CONTROL_WRITE_RTS       0x0200
155
156 /*
157  * cp2101_get_config
158  * Reads from the CP2101 configuration registers
159  * 'size' is specified in bytes.
160  * 'data' is a pointer to a pre-allocated array of integers large
161  * enough to hold 'size' bytes (with 4 bytes to each integer)
162  */
163 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
164                 unsigned int *data, int size)
165 {
166         struct usb_serial *serial = port->serial;
167         u32 *buf;
168         int result, i, length;
169
170         /* Number of integers required to contain the array */
171         length = (((size - 1) | 3) + 1)/4;
172
173         buf = kcalloc(length, sizeof(u32), GFP_KERNEL);
174         if (!buf) {
175                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
176                 return -ENOMEM;
177         }
178
179         /* For get requests, the request number must be incremented */
180         request++;
181
182         /* Issue the request, attempting to read 'size' bytes */
183         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
184                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
185                                 0, buf, size, 300);
186
187         /* Convert data into an array of integers */
188         for (i=0; i<length; i++)
189                 data[i] = le32_to_cpu(buf[i]);
190
191         kfree(buf);
192
193         if (result != size) {
194                 dev_err(&port->dev, "%s - Unable to send config request, "
195                                 "request=0x%x size=%d result=%d\n",
196                                 __FUNCTION__, request, size, result);
197                 return -EPROTO;
198         }
199
200         return 0;
201 }
202
203 /*
204  * cp2101_set_config
205  * Writes to the CP2101 configuration registers
206  * Values less than 16 bits wide are sent directly
207  * 'size' is specified in bytes.
208  */
209 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
210                 unsigned int *data, int size)
211 {
212         struct usb_serial *serial = port->serial;
213         u32 *buf;
214         int result, i, length;
215
216         /* Number of integers required to contain the array */
217         length = (((size - 1) | 3) + 1)/4;
218
219         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
220         if (!buf) {
221                 dev_err(&port->dev, "%s - out of memory.\n",
222                                 __FUNCTION__);
223                 return -ENOMEM;
224         }
225
226         /* Array of integers into bytes */
227         for (i = 0; i < length; i++)
228                 buf[i] = cpu_to_le32(data[i]);
229
230         if (size > 2) {
231                 result = usb_control_msg (serial->dev,
232                                 usb_sndctrlpipe(serial->dev, 0),
233                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
234                                 0, buf, size, 300);
235         } else {
236                 result = usb_control_msg (serial->dev,
237                                 usb_sndctrlpipe(serial->dev, 0),
238                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
239                                 0, NULL, 0, 300);
240         }
241
242         kfree(buf);
243
244         if ((size > 2 && result != size) || result < 0) {
245                 dev_err(&port->dev, "%s - Unable to send request, "
246                                 "request=0x%x size=%d result=%d\n",
247                                 __FUNCTION__, request, size, result);
248                 return -EPROTO;
249         }
250
251         /* Single data value */
252         result = usb_control_msg (serial->dev,
253                         usb_sndctrlpipe(serial->dev, 0),
254                         request, REQTYPE_HOST_TO_DEVICE, data[0],
255                         0, NULL, 0, 300);
256         return 0;
257 }
258
259 /*
260  * cp2101_set_config_single
261  * Convenience function for calling cp2101_set_config on single data values
262  * without requiring an integer pointer
263  */
264 static inline int cp2101_set_config_single(struct usb_serial_port* port,
265                 u8 request, unsigned int data)
266 {
267         return cp2101_set_config(port, request, &data, 2);
268 }
269
270 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
271 {
272         struct usb_serial *serial = port->serial;
273         int result;
274
275         dbg("%s - port %d", __FUNCTION__, port->number);
276
277         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
278                 dev_err(&port->dev, "%s - Unable to enable UART\n",
279                                 __FUNCTION__);
280                 return -EPROTO;
281         }
282
283         /* Start reading from the device */
284         usb_fill_bulk_urb (port->read_urb, serial->dev,
285                         usb_rcvbulkpipe(serial->dev,
286                         port->bulk_in_endpointAddress),
287                         port->read_urb->transfer_buffer,
288                         port->read_urb->transfer_buffer_length,
289                         serial->type->read_bulk_callback,
290                         port);
291         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
292         if (result) {
293                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
294                                 "error %d\n", __FUNCTION__, result);
295                 return result;
296         }
297
298         /* Configure the termios structure */
299         cp2101_get_termios(port);
300
301         /* Set the DTR and RTS pins low */
302         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
303
304         return 0;
305 }
306
307 static void cp2101_cleanup (struct usb_serial_port *port)
308 {
309         struct usb_serial *serial = port->serial;
310
311         dbg("%s - port %d", __FUNCTION__, port->number);
312
313         if (serial->dev) {
314                 /* shutdown any bulk reads that might be going on */
315                 if (serial->num_bulk_out)
316                         usb_kill_urb(port->write_urb);
317                 if (serial->num_bulk_in)
318                         usb_kill_urb(port->read_urb);
319         }
320 }
321
322 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
323 {
324         dbg("%s - port %d", __FUNCTION__, port->number);
325
326         /* shutdown our urbs */
327         dbg("%s - shutting down urbs", __FUNCTION__);
328         usb_kill_urb(port->write_urb);
329         usb_kill_urb(port->read_urb);
330
331         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
332 }
333
334 /*
335  * cp2101_get_termios
336  * Reads the baud rate, data bits, parity, stop bits and flow control mode
337  * from the device, corrects any unsupported values, and configures the
338  * termios structure to reflect the state of the device
339  */
340 static void cp2101_get_termios (struct usb_serial_port *port)
341 {
342         unsigned int cflag, modem_ctl[4];
343         int baud;
344         int bits;
345
346         dbg("%s - port %d", __FUNCTION__, port->number);
347
348         if ((!port->tty) || (!port->tty->termios)) {
349                 dbg("%s - no tty structures", __FUNCTION__);
350                 return;
351         }
352         cflag = port->tty->termios->c_cflag;
353
354         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
355         /* Convert to baudrate */
356         if (baud)
357                 baud = BAUD_RATE_GEN_FREQ / baud;
358
359         dbg("%s - baud rate = %d", __FUNCTION__, baud);
360         cflag &= ~CBAUD;
361         switch (baud) {
362                 /*
363                  * The baud rates which are commented out below
364                  * appear to be supported by the device
365                  * but are non-standard
366                  */
367                 case 600:       cflag |= B600;          break;
368                 case 1200:      cflag |= B1200;         break;
369                 case 1800:      cflag |= B1800;         break;
370                 case 2400:      cflag |= B2400;         break;
371                 case 4800:      cflag |= B4800;         break;
372                 /*case 7200:    cflag |= B7200;         break;*/
373                 case 9600:      cflag |= B9600;         break;
374                 /*case 14400:   cflag |= B14400;        break;*/
375                 case 19200:     cflag |= B19200;        break;
376                 /*case 28800:   cflag |= B28800;        break;*/
377                 case 38400:     cflag |= B38400;        break;
378                 /*case 55854:   cflag |= B55054;        break;*/
379                 case 57600:     cflag |= B57600;        break;
380                 case 115200:    cflag |= B115200;       break;
381                 /*case 127117:  cflag |= B127117;       break;*/
382                 case 230400:    cflag |= B230400;       break;
383                 case 460800:    cflag |= B460800;       break;
384                 case 921600:    cflag |= B921600;       break;
385                 /*case 3686400: cflag |= B3686400;      break;*/
386                 default:
387                         dbg("%s - Baud rate is not supported, "
388                                         "using 9600 baud", __FUNCTION__);
389                         cflag |= B9600;
390                         cp2101_set_config_single(port, CP2101_BAUDRATE,
391                                         (BAUD_RATE_GEN_FREQ/9600));
392                         break;
393         }
394
395         cp2101_get_config(port, CP2101_BITS, &bits, 2);
396         cflag &= ~CSIZE;
397         switch(bits & BITS_DATA_MASK) {
398                 case BITS_DATA_5:
399                         dbg("%s - data bits = 5", __FUNCTION__);
400                         cflag |= CS5;
401                         break;
402                 case BITS_DATA_6:
403                         dbg("%s - data bits = 6", __FUNCTION__);
404                         cflag |= CS6;
405                         break;
406                 case BITS_DATA_7:
407                         dbg("%s - data bits = 7", __FUNCTION__);
408                         cflag |= CS7;
409                         break;
410                 case BITS_DATA_8:
411                         dbg("%s - data bits = 8", __FUNCTION__);
412                         cflag |= CS8;
413                         break;
414                 case BITS_DATA_9:
415                         dbg("%s - data bits = 9 (not supported, "
416                                         "using 8 data bits)", __FUNCTION__);
417                         cflag |= CS8;
418                         bits &= ~BITS_DATA_MASK;
419                         bits |= BITS_DATA_8;
420                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
421                         break;
422                 default:
423                         dbg("%s - Unknown number of data bits, "
424                                         "using 8", __FUNCTION__);
425                         cflag |= CS8;
426                         bits &= ~BITS_DATA_MASK;
427                         bits |= BITS_DATA_8;
428                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
429                         break;
430         }
431
432         switch(bits & BITS_PARITY_MASK) {
433                 case BITS_PARITY_NONE:
434                         dbg("%s - parity = NONE", __FUNCTION__);
435                         cflag &= ~PARENB;
436                         break;
437                 case BITS_PARITY_ODD:
438                         dbg("%s - parity = ODD", __FUNCTION__);
439                         cflag |= (PARENB|PARODD);
440                         break;
441                 case BITS_PARITY_EVEN:
442                         dbg("%s - parity = EVEN", __FUNCTION__);
443                         cflag &= ~PARODD;
444                         cflag |= PARENB;
445                         break;
446                 case BITS_PARITY_MARK:
447                         dbg("%s - parity = MARK (not supported, "
448                                         "disabling parity)", __FUNCTION__);
449                         cflag &= ~PARENB;
450                         bits &= ~BITS_PARITY_MASK;
451                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
452                         break;
453                 case BITS_PARITY_SPACE:
454                         dbg("%s - parity = SPACE (not supported, "
455                                         "disabling parity)", __FUNCTION__);
456                         cflag &= ~PARENB;
457                         bits &= ~BITS_PARITY_MASK;
458                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
459                         break;
460                 default:
461                         dbg("%s - Unknown parity mode, "
462                                         "disabling parity", __FUNCTION__);
463                         cflag &= ~PARENB;
464                         bits &= ~BITS_PARITY_MASK;
465                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
466                         break;
467         }
468
469         cflag &= ~CSTOPB;
470         switch(bits & BITS_STOP_MASK) {
471                 case BITS_STOP_1:
472                         dbg("%s - stop bits = 1", __FUNCTION__);
473                         break;
474                 case BITS_STOP_1_5:
475                         dbg("%s - stop bits = 1.5 (not supported, "
476                                         "using 1 stop bit)", __FUNCTION__);
477                         bits &= ~BITS_STOP_MASK;
478                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
479                         break;
480                 case BITS_STOP_2:
481                         dbg("%s - stop bits = 2", __FUNCTION__);
482                         cflag |= CSTOPB;
483                         break;
484                 default:
485                         dbg("%s - Unknown number of stop bits, "
486                                         "using 1 stop bit", __FUNCTION__);
487                         bits &= ~BITS_STOP_MASK;
488                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
489                         break;
490         }
491
492         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
493         if (modem_ctl[0] & 0x0008) {
494                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
495                 cflag |= CRTSCTS;
496         } else {
497                 dbg("%s - flow control = NONE", __FUNCTION__);
498                 cflag &= ~CRTSCTS;
499         }
500
501         port->tty->termios->c_cflag = cflag;
502 }
503
504 static void cp2101_set_termios (struct usb_serial_port *port,
505                 struct termios *old_termios)
506 {
507         unsigned int cflag, old_cflag=0;
508         int baud=0, bits;
509         unsigned int modem_ctl[4];
510
511         dbg("%s - port %d", __FUNCTION__, port->number);
512
513         if ((!port->tty) || (!port->tty->termios)) {
514                 dbg("%s - no tty structures", __FUNCTION__);
515                 return;
516         }
517         cflag = port->tty->termios->c_cflag;
518
519         /* Check that they really want us to change something */
520         if (old_termios) {
521                 if ((cflag == old_termios->c_cflag) &&
522                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
523                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
524                         dbg("%s - nothing to change...", __FUNCTION__);
525                         return;
526                 }
527
528                 old_cflag = old_termios->c_cflag;
529         }
530
531         /* If the baud rate is to be updated*/
532         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
533                 switch (cflag & CBAUD) {
534                         /*
535                          * The baud rates which are commented out below
536                          * appear to be supported by the device
537                          * but are non-standard
538                          */
539                         case B0:        baud = 0;       break;
540                         case B600:      baud = 600;     break;
541                         case B1200:     baud = 1200;    break;
542                         case B1800:     baud = 1800;    break;
543                         case B2400:     baud = 2400;    break;
544                         case B4800:     baud = 4800;    break;
545                         /*case B7200:   baud = 7200;    break;*/
546                         case B9600:     baud = 9600;    break;
547                         /*ase B14400:   baud = 14400;   break;*/
548                         case B19200:    baud = 19200;   break;
549                         /*case B28800:  baud = 28800;   break;*/
550                         case B38400:    baud = 38400;   break;
551                         /*case B55854:  baud = 55054;   break;*/
552                         case B57600:    baud = 57600;   break;
553                         case B115200:   baud = 115200;  break;
554                         /*case B127117: baud = 127117;  break;*/
555                         case B230400:   baud = 230400;  break;
556                         case B460800:   baud = 460800;  break;
557                         case B921600:   baud = 921600;  break;
558                         /*case B3686400:        baud = 3686400; break;*/
559                         default:
560                                 dev_err(&port->dev, "cp2101 driver does not "
561                                         "support the baudrate requested\n");
562                                 break;
563                 }
564
565                 if (baud) {
566                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
567                                         baud);
568                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
569                                                 (BAUD_RATE_GEN_FREQ / baud)))
570                                 dev_err(&port->dev, "Baud rate requested not "
571                                                 "supported by device\n");
572                 }
573         }
574
575         /* If the number of data bits is to be updated */
576         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
577                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
578                 bits &= ~BITS_DATA_MASK;
579                 switch (cflag & CSIZE) {
580                         case CS5:
581                                 bits |= BITS_DATA_5;
582                                 dbg("%s - data bits = 5", __FUNCTION__);
583                                 break;
584                         case CS6:
585                                 bits |= BITS_DATA_6;
586                                 dbg("%s - data bits = 6", __FUNCTION__);
587                                 break;
588                         case CS7:
589                                 bits |= BITS_DATA_7;
590                                 dbg("%s - data bits = 7", __FUNCTION__);
591                                 break;
592                         case CS8:
593                                 bits |= BITS_DATA_8;
594                                 dbg("%s - data bits = 8", __FUNCTION__);
595                                 break;
596                         /*case CS9:
597                                 bits |= BITS_DATA_9;
598                                 dbg("%s - data bits = 9", __FUNCTION__);
599                                 break;*/
600                         default:
601                                 dev_err(&port->dev, "cp2101 driver does not "
602                                         "support the number of bits requested,"
603                                         " using 8 bit mode\n");
604                                 bits |= BITS_DATA_8;
605                                 break;
606                 }
607                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
608                         dev_err(&port->dev, "Number of data bits requested "
609                                         "not supported by device\n");
610         }
611
612         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
613                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
614                 bits &= ~BITS_PARITY_MASK;
615                 if (cflag & PARENB) {
616                         if (cflag & PARODD) {
617                                 bits |= BITS_PARITY_ODD;
618                                 dbg("%s - parity = ODD", __FUNCTION__);
619                         } else {
620                                 bits |= BITS_PARITY_EVEN;
621                                 dbg("%s - parity = EVEN", __FUNCTION__);
622                         }
623                 }
624                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
625                         dev_err(&port->dev, "Parity mode not supported "
626                                         "by device\n");
627         }
628
629         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
630                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
631                 bits &= ~BITS_STOP_MASK;
632                 if (cflag & CSTOPB) {
633                         bits |= BITS_STOP_2;
634                         dbg("%s - stop bits = 2", __FUNCTION__);
635                 } else {
636                         bits |= BITS_STOP_1;
637                         dbg("%s - stop bits = 1", __FUNCTION__);
638                 }
639                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
640                         dev_err(&port->dev, "Number of stop bits requested "
641                                         "not supported by device\n");
642         }
643
644         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
645                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
646                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
647                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
648                                 modem_ctl[2], modem_ctl[3]);
649
650                 if (cflag & CRTSCTS) {
651                         modem_ctl[0] &= ~0x7B;
652                         modem_ctl[0] |= 0x09;
653                         modem_ctl[1] = 0x80;
654                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
655                 } else {
656                         modem_ctl[0] &= ~0x7B;
657                         modem_ctl[0] |= 0x01;
658                         modem_ctl[1] |= 0x40;
659                         dbg("%s - flow control = NONE", __FUNCTION__);
660                 }
661
662                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
663                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
664                                 modem_ctl[2], modem_ctl[3]);
665                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
666         }
667
668 }
669
670 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
671                 unsigned int set, unsigned int clear)
672 {
673         int control = 0;
674
675         dbg("%s - port %d", __FUNCTION__, port->number);
676
677         if (set & TIOCM_RTS) {
678                 control |= CONTROL_RTS;
679                 control |= CONTROL_WRITE_RTS;
680         }
681         if (set & TIOCM_DTR) {
682                 control |= CONTROL_DTR;
683                 control |= CONTROL_WRITE_DTR;
684         }
685         if (clear & TIOCM_RTS) {
686                 control &= ~CONTROL_RTS;
687                 control |= CONTROL_WRITE_RTS;
688         }
689         if (clear & TIOCM_DTR) {
690                 control &= ~CONTROL_DTR;
691                 control |= CONTROL_WRITE_DTR;
692         }
693
694         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
695
696         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
697
698 }
699
700 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
701 {
702         int control, result;
703
704         dbg("%s - port %d", __FUNCTION__, port->number);
705
706         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
707
708         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
709                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
710                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
711                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
712                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
713                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
714
715         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
716
717         return result;
718 }
719
720 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
721 {
722         int state;
723
724         dbg("%s - port %d", __FUNCTION__, port->number);
725         if (break_state == 0)
726                 state = BREAK_OFF;
727         else
728                 state = BREAK_ON;
729         dbg("%s - turning break %s", __FUNCTION__,
730                         state==BREAK_OFF ? "off" : "on");
731         cp2101_set_config(port, CP2101_BREAK, &state, 2);
732 }
733
734 static int cp2101_startup (struct usb_serial *serial)
735 {
736         /* CP2101 buffers behave strangely unless device is reset */
737         usb_reset_device(serial->dev);
738         return 0;
739 }
740
741 static void cp2101_shutdown (struct usb_serial *serial)
742 {
743         int i;
744
745         dbg("%s", __FUNCTION__);
746
747         /* Stop reads and writes on all ports */
748         for (i=0; i < serial->num_ports; ++i) {
749                 cp2101_cleanup(serial->port[i]);
750         }
751 }
752
753 static int __init cp2101_init (void)
754 {
755         int retval;
756
757         retval = usb_serial_register(&cp2101_device);
758         if (retval)
759                 return retval; /* Failed to register */
760
761         retval = usb_register(&cp2101_driver);
762         if (retval) {
763                 /* Failed to register */
764                 usb_serial_deregister(&cp2101_device);
765                 return retval;
766         }
767
768         /* Success */
769         info(DRIVER_DESC " " DRIVER_VERSION);
770         return 0;
771 }
772
773 static void __exit cp2101_exit (void)
774 {
775         usb_deregister (&cp2101_driver);
776         usb_serial_deregister (&cp2101_device);
777 }
778
779 module_init(cp2101_init);
780 module_exit(cp2101_exit);
781
782 MODULE_DESCRIPTION(DRIVER_DESC);
783 MODULE_VERSION(DRIVER_VERSION);
784 MODULE_LICENSE("GPL");
785
786 module_param(debug, bool, S_IRUGO | S_IWUSR);
787 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");