Pull sn-handle-sc-powerdown into release branch
[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 "v0.06"
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, 0x807A) }, /* Crumb128 board */
62         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
63         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
64         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
65         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
66         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
67         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
68         { } /* Terminating Entry */
69 };
70
71 MODULE_DEVICE_TABLE (usb, id_table);
72
73 static struct usb_driver cp2101_driver = {
74         .name           = "cp2101",
75         .probe          = usb_serial_probe,
76         .disconnect     = usb_serial_disconnect,
77         .id_table       = id_table,
78         .no_dynamic_id  =       1,
79 };
80
81 static struct usb_serial_driver cp2101_device = {
82         .driver = {
83                 .owner =        THIS_MODULE,
84                 .name =         "cp2101",
85         },
86         .id_table               = id_table,
87         .num_interrupt_in       = 0,
88         .num_bulk_in            = 0,
89         .num_bulk_out           = 0,
90         .num_ports              = 1,
91         .open                   = cp2101_open,
92         .close                  = cp2101_close,
93         .break_ctl              = cp2101_break_ctl,
94         .set_termios            = cp2101_set_termios,
95         .tiocmget               = cp2101_tiocmget,
96         .tiocmset               = cp2101_tiocmset,
97         .attach                 = cp2101_startup,
98         .shutdown               = cp2101_shutdown,
99 };
100
101 /* Config request types */
102 #define REQTYPE_HOST_TO_DEVICE  0x41
103 #define REQTYPE_DEVICE_TO_HOST  0xc1
104
105 /* Config SET requests. To GET, add 1 to the request number */
106 #define CP2101_UART             0x00    /* Enable / Disable */
107 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
108 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
109 #define CP2101_BREAK            0x05    /* On / Off */
110 #define CP2101_CONTROL          0x07    /* Flow control line states */
111 #define CP2101_MODEMCTL         0x13    /* Modem controls */
112 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
113
114 /* CP2101_UART */
115 #define UART_ENABLE             0x0001
116 #define UART_DISABLE            0x0000
117
118 /* CP2101_BAUDRATE */
119 #define BAUD_RATE_GEN_FREQ      0x384000
120
121 /* CP2101_BITS */
122 #define BITS_DATA_MASK          0X0f00
123 #define BITS_DATA_5             0X0500
124 #define BITS_DATA_6             0X0600
125 #define BITS_DATA_7             0X0700
126 #define BITS_DATA_8             0X0800
127 #define BITS_DATA_9             0X0900
128
129 #define BITS_PARITY_MASK        0x00f0
130 #define BITS_PARITY_NONE        0x0000
131 #define BITS_PARITY_ODD         0x0010
132 #define BITS_PARITY_EVEN        0x0020
133 #define BITS_PARITY_MARK        0x0030
134 #define BITS_PARITY_SPACE       0x0040
135
136 #define BITS_STOP_MASK          0x000f
137 #define BITS_STOP_1             0x0000
138 #define BITS_STOP_1_5           0x0001
139 #define BITS_STOP_2             0x0002
140
141 /* CP2101_BREAK */
142 #define BREAK_ON                0x0000
143 #define BREAK_OFF               0x0001
144
145 /* CP2101_CONTROL */
146 #define CONTROL_DTR             0x0001
147 #define CONTROL_RTS             0x0002
148 #define CONTROL_CTS             0x0010
149 #define CONTROL_DSR             0x0020
150 #define CONTROL_RING            0x0040
151 #define CONTROL_DCD             0x0080
152 #define CONTROL_WRITE_DTR       0x0100
153 #define CONTROL_WRITE_RTS       0x0200
154
155 /*
156  * cp2101_get_config
157  * Reads from the CP2101 configuration registers
158  * 'size' is specified in bytes.
159  * 'data' is a pointer to a pre-allocated array of integers large
160  * enough to hold 'size' bytes (with 4 bytes to each integer)
161  */
162 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
163                 unsigned int *data, int size)
164 {
165         struct usb_serial *serial = port->serial;
166         u32 *buf;
167         int result, i, length;
168
169         /* Number of integers required to contain the array */
170         length = (((size - 1) | 3) + 1)/4;
171
172         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
173         memset(buf, 0, length * sizeof(u32));
174
175         if (!buf) {
176                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
177                 return -ENOMEM;
178         }
179
180         /* For get requests, the request number must be incremented */
181         request++;
182
183         /* Issue the request, attempting to read 'size' bytes */
184         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
185                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
186                                 0, buf, size, 300);
187
188         /* Convert data into an array of integers */
189         for (i=0; i<length; i++)
190                 data[i] = le32_to_cpu(buf[i]);
191
192         kfree(buf);
193
194         if (result != size) {
195                 dev_err(&port->dev, "%s - Unable to send config request, "
196                                 "request=0x%x size=%d result=%d\n",
197                                 __FUNCTION__, request, size, result);
198                 return -EPROTO;
199         }
200
201         return 0;
202 }
203
204 /*
205  * cp2101_set_config
206  * Writes to the CP2101 configuration registers
207  * Values less than 16 bits wide are sent directly
208  * 'size' is specified in bytes.
209  */
210 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
211                 unsigned int *data, int size)
212 {
213         struct usb_serial *serial = port->serial;
214         u32 *buf;
215         int result, i, length;
216
217         /* Number of integers required to contain the array */
218         length = (((size - 1) | 3) + 1)/4;
219
220         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
221         if (!buf) {
222                 dev_err(&port->dev, "%s - out of memory.\n",
223                                 __FUNCTION__);
224                 return -ENOMEM;
225         }
226
227         /* Array of integers into bytes */
228         for (i = 0; i < length; i++)
229                 buf[i] = cpu_to_le32(data[i]);
230
231         if (size > 2) {
232                 result = usb_control_msg (serial->dev,
233                                 usb_sndctrlpipe(serial->dev, 0),
234                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
235                                 0, buf, size, 300);
236         } else {
237                 result = usb_control_msg (serial->dev,
238                                 usb_sndctrlpipe(serial->dev, 0),
239                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
240                                 0, NULL, 0, 300);
241         }
242
243         kfree(buf);
244
245         if ((size > 2 && result != size) || result < 0) {
246                 dev_err(&port->dev, "%s - Unable to send request, "
247                                 "request=0x%x size=%d result=%d\n",
248                                 __FUNCTION__, request, size, result);
249                 return -EPROTO;
250         }
251
252         /* Single data value */
253         result = usb_control_msg (serial->dev,
254                         usb_sndctrlpipe(serial->dev, 0),
255                         request, REQTYPE_HOST_TO_DEVICE, data[0],
256                         0, NULL, 0, 300);
257         return 0;
258 }
259
260 /*
261  * cp2101_set_config_single
262  * Convenience function for calling cp2101_set_config on single data values
263  * without requiring an integer pointer
264  */
265 static inline int cp2101_set_config_single(struct usb_serial_port* port,
266                 u8 request, unsigned int data)
267 {
268         return cp2101_set_config(port, request, &data, 2);
269 }
270
271 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
272 {
273         struct usb_serial *serial = port->serial;
274         int result;
275
276         dbg("%s - port %d", __FUNCTION__, port->number);
277
278         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
279                 dev_err(&port->dev, "%s - Unable to enable UART\n",
280                                 __FUNCTION__);
281                 return -EPROTO;
282         }
283
284         /* Start reading from the device */
285         usb_fill_bulk_urb (port->read_urb, serial->dev,
286                         usb_rcvbulkpipe(serial->dev,
287                         port->bulk_in_endpointAddress),
288                         port->read_urb->transfer_buffer,
289                         port->read_urb->transfer_buffer_length,
290                         serial->type->read_bulk_callback,
291                         port);
292         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
293         if (result) {
294                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
295                                 "error %d\n", __FUNCTION__, result);
296                 return result;
297         }
298
299         /* Configure the termios structure */
300         cp2101_get_termios(port);
301
302         /* Set the DTR and RTS pins low */
303         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
304
305         return 0;
306 }
307
308 static void cp2101_cleanup (struct usb_serial_port *port)
309 {
310         struct usb_serial *serial = port->serial;
311
312         dbg("%s - port %d", __FUNCTION__, port->number);
313
314         if (serial->dev) {
315                 /* shutdown any bulk reads that might be going on */
316                 if (serial->num_bulk_out)
317                         usb_kill_urb(port->write_urb);
318                 if (serial->num_bulk_in)
319                         usb_kill_urb(port->read_urb);
320         }
321 }
322
323 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
324 {
325         dbg("%s - port %d", __FUNCTION__, port->number);
326
327         /* shutdown our urbs */
328         dbg("%s - shutting down urbs", __FUNCTION__);
329         usb_kill_urb(port->write_urb);
330         usb_kill_urb(port->read_urb);
331
332         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
333 }
334
335 /*
336  * cp2101_get_termios
337  * Reads the baud rate, data bits, parity, stop bits and flow control mode
338  * from the device, corrects any unsupported values, and configures the
339  * termios structure to reflect the state of the device
340  */
341 static void cp2101_get_termios (struct usb_serial_port *port)
342 {
343         unsigned int cflag, modem_ctl[4];
344         int baud;
345         int bits;
346
347         dbg("%s - port %d", __FUNCTION__, port->number);
348
349         if ((!port->tty) || (!port->tty->termios)) {
350                 dbg("%s - no tty structures", __FUNCTION__);
351                 return;
352         }
353         cflag = port->tty->termios->c_cflag;
354
355         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
356         /* Convert to baudrate */
357         if (baud)
358                 baud = BAUD_RATE_GEN_FREQ / baud;
359
360         dbg("%s - baud rate = %d", __FUNCTION__, baud);
361         cflag &= ~CBAUD;
362         switch (baud) {
363                 /*
364                  * The baud rates which are commented out below
365                  * appear to be supported by the device
366                  * but are non-standard
367                  */
368                 case 600:       cflag |= B600;          break;
369                 case 1200:      cflag |= B1200;         break;
370                 case 1800:      cflag |= B1800;         break;
371                 case 2400:      cflag |= B2400;         break;
372                 case 4800:      cflag |= B4800;         break;
373                 /*case 7200:    cflag |= B7200;         break;*/
374                 case 9600:      cflag |= B9600;         break;
375                 /*case 14400:   cflag |= B14400;        break;*/
376                 case 19200:     cflag |= B19200;        break;
377                 /*case 28800:   cflag |= B28800;        break;*/
378                 case 38400:     cflag |= B38400;        break;
379                 /*case 55854:   cflag |= B55054;        break;*/
380                 case 57600:     cflag |= B57600;        break;
381                 case 115200:    cflag |= B115200;       break;
382                 /*case 127117:  cflag |= B127117;       break;*/
383                 case 230400:    cflag |= B230400;       break;
384                 case 460800:    cflag |= B460800;       break;
385                 case 921600:    cflag |= B921600;       break;
386                 /*case 3686400: cflag |= B3686400;      break;*/
387                 default:
388                         dbg("%s - Baud rate is not supported, "
389                                         "using 9600 baud", __FUNCTION__);
390                         cflag |= B9600;
391                         cp2101_set_config_single(port, CP2101_BAUDRATE,
392                                         (BAUD_RATE_GEN_FREQ/9600));
393                         break;
394         }
395
396         cp2101_get_config(port, CP2101_BITS, &bits, 2);
397         cflag &= ~CSIZE;
398         switch(bits & BITS_DATA_MASK) {
399                 case BITS_DATA_5:
400                         dbg("%s - data bits = 5", __FUNCTION__);
401                         cflag |= CS5;
402                         break;
403                 case BITS_DATA_6:
404                         dbg("%s - data bits = 6", __FUNCTION__);
405                         cflag |= CS6;
406                         break;
407                 case BITS_DATA_7:
408                         dbg("%s - data bits = 7", __FUNCTION__);
409                         cflag |= CS7;
410                         break;
411                 case BITS_DATA_8:
412                         dbg("%s - data bits = 8", __FUNCTION__);
413                         cflag |= CS8;
414                         break;
415                 case BITS_DATA_9:
416                         dbg("%s - data bits = 9 (not supported, "
417                                         "using 8 data bits)", __FUNCTION__);
418                         cflag |= CS8;
419                         bits &= ~BITS_DATA_MASK;
420                         bits |= BITS_DATA_8;
421                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
422                         break;
423                 default:
424                         dbg("%s - Unknown number of data bits, "
425                                         "using 8", __FUNCTION__);
426                         cflag |= CS8;
427                         bits &= ~BITS_DATA_MASK;
428                         bits |= BITS_DATA_8;
429                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
430                         break;
431         }
432
433         switch(bits & BITS_PARITY_MASK) {
434                 case BITS_PARITY_NONE:
435                         dbg("%s - parity = NONE", __FUNCTION__);
436                         cflag &= ~PARENB;
437                         break;
438                 case BITS_PARITY_ODD:
439                         dbg("%s - parity = ODD", __FUNCTION__);
440                         cflag |= (PARENB|PARODD);
441                         break;
442                 case BITS_PARITY_EVEN:
443                         dbg("%s - parity = EVEN", __FUNCTION__);
444                         cflag &= ~PARODD;
445                         cflag |= PARENB;
446                         break;
447                 case BITS_PARITY_MARK:
448                         dbg("%s - parity = MARK (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                 case BITS_PARITY_SPACE:
455                         dbg("%s - parity = SPACE (not supported, "
456                                         "disabling parity)", __FUNCTION__);
457                         cflag &= ~PARENB;
458                         bits &= ~BITS_PARITY_MASK;
459                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
460                         break;
461                 default:
462                         dbg("%s - Unknown parity mode, "
463                                         "disabling parity", __FUNCTION__);
464                         cflag &= ~PARENB;
465                         bits &= ~BITS_PARITY_MASK;
466                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
467                         break;
468         }
469
470         cflag &= ~CSTOPB;
471         switch(bits & BITS_STOP_MASK) {
472                 case BITS_STOP_1:
473                         dbg("%s - stop bits = 1", __FUNCTION__);
474                         break;
475                 case BITS_STOP_1_5:
476                         dbg("%s - stop bits = 1.5 (not supported, "
477                                         "using 1 stop bit)", __FUNCTION__);
478                         bits &= ~BITS_STOP_MASK;
479                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
480                         break;
481                 case BITS_STOP_2:
482                         dbg("%s - stop bits = 2", __FUNCTION__);
483                         cflag |= CSTOPB;
484                         break;
485                 default:
486                         dbg("%s - Unknown number of stop bits, "
487                                         "using 1 stop bit", __FUNCTION__);
488                         bits &= ~BITS_STOP_MASK;
489                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
490                         break;
491         }
492
493         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
494         if (modem_ctl[0] & 0x0008) {
495                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
496                 cflag |= CRTSCTS;
497         } else {
498                 dbg("%s - flow control = NONE", __FUNCTION__);
499                 cflag &= ~CRTSCTS;
500         }
501
502         port->tty->termios->c_cflag = cflag;
503 }
504
505 static void cp2101_set_termios (struct usb_serial_port *port,
506                 struct termios *old_termios)
507 {
508         unsigned int cflag, old_cflag=0;
509         int baud=0, bits;
510         unsigned int modem_ctl[4];
511
512         dbg("%s - port %d", __FUNCTION__, port->number);
513
514         if ((!port->tty) || (!port->tty->termios)) {
515                 dbg("%s - no tty structures", __FUNCTION__);
516                 return;
517         }
518         cflag = port->tty->termios->c_cflag;
519
520         /* Check that they really want us to change something */
521         if (old_termios) {
522                 if ((cflag == old_termios->c_cflag) &&
523                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
524                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
525                         dbg("%s - nothing to change...", __FUNCTION__);
526                         return;
527                 }
528
529                 old_cflag = old_termios->c_cflag;
530         }
531
532         /* If the baud rate is to be updated*/
533         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
534                 switch (cflag & CBAUD) {
535                         /*
536                          * The baud rates which are commented out below
537                          * appear to be supported by the device
538                          * but are non-standard
539                          */
540                         case B0:        baud = 0;       break;
541                         case B600:      baud = 600;     break;
542                         case B1200:     baud = 1200;    break;
543                         case B1800:     baud = 1800;    break;
544                         case B2400:     baud = 2400;    break;
545                         case B4800:     baud = 4800;    break;
546                         /*case B7200:   baud = 7200;    break;*/
547                         case B9600:     baud = 9600;    break;
548                         /*ase B14400:   baud = 14400;   break;*/
549                         case B19200:    baud = 19200;   break;
550                         /*case B28800:  baud = 28800;   break;*/
551                         case B38400:    baud = 38400;   break;
552                         /*case B55854:  baud = 55054;   break;*/
553                         case B57600:    baud = 57600;   break;
554                         case B115200:   baud = 115200;  break;
555                         /*case B127117: baud = 127117;  break;*/
556                         case B230400:   baud = 230400;  break;
557                         case B460800:   baud = 460800;  break;
558                         case B921600:   baud = 921600;  break;
559                         /*case B3686400:        baud = 3686400; break;*/
560                         default:
561                                 dev_err(&port->dev, "cp2101 driver does not "
562                                         "support the baudrate requested\n");
563                                 break;
564                 }
565
566                 if (baud) {
567                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
568                                         baud);
569                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
570                                                 (BAUD_RATE_GEN_FREQ / baud)))
571                                 dev_err(&port->dev, "Baud rate requested not "
572                                                 "supported by device\n");
573                 }
574         }
575
576         /* If the number of data bits is to be updated */
577         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
578                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
579                 bits &= ~BITS_DATA_MASK;
580                 switch (cflag & CSIZE) {
581                         case CS5:
582                                 bits |= BITS_DATA_5;
583                                 dbg("%s - data bits = 5", __FUNCTION__);
584                                 break;
585                         case CS6:
586                                 bits |= BITS_DATA_6;
587                                 dbg("%s - data bits = 6", __FUNCTION__);
588                                 break;
589                         case CS7:
590                                 bits |= BITS_DATA_7;
591                                 dbg("%s - data bits = 7", __FUNCTION__);
592                                 break;
593                         case CS8:
594                                 bits |= BITS_DATA_8;
595                                 dbg("%s - data bits = 8", __FUNCTION__);
596                                 break;
597                         /*case CS9:
598                                 bits |= BITS_DATA_9;
599                                 dbg("%s - data bits = 9", __FUNCTION__);
600                                 break;*/
601                         default:
602                                 dev_err(&port->dev, "cp2101 driver does not "
603                                         "support the number of bits requested,"
604                                         " using 8 bit mode\n");
605                                 bits |= BITS_DATA_8;
606                                 break;
607                 }
608                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
609                         dev_err(&port->dev, "Number of data bits requested "
610                                         "not supported by device\n");
611         }
612
613         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
614                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
615                 bits &= ~BITS_PARITY_MASK;
616                 if (cflag & PARENB) {
617                         if (cflag & PARODD) {
618                                 bits |= BITS_PARITY_ODD;
619                                 dbg("%s - parity = ODD", __FUNCTION__);
620                         } else {
621                                 bits |= BITS_PARITY_EVEN;
622                                 dbg("%s - parity = EVEN", __FUNCTION__);
623                         }
624                 }
625                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
626                         dev_err(&port->dev, "Parity mode not supported "
627                                         "by device\n");
628         }
629
630         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
631                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
632                 bits &= ~BITS_STOP_MASK;
633                 if (cflag & CSTOPB) {
634                         bits |= BITS_STOP_2;
635                         dbg("%s - stop bits = 2", __FUNCTION__);
636                 } else {
637                         bits |= BITS_STOP_1;
638                         dbg("%s - stop bits = 1", __FUNCTION__);
639                 }
640                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
641                         dev_err(&port->dev, "Number of stop bits requested "
642                                         "not supported by device\n");
643         }
644
645         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
646                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
647                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
648                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
649                                 modem_ctl[2], modem_ctl[3]);
650
651                 if (cflag & CRTSCTS) {
652                         modem_ctl[0] &= ~0x7B;
653                         modem_ctl[0] |= 0x09;
654                         modem_ctl[1] = 0x80;
655                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
656                 } else {
657                         modem_ctl[0] &= ~0x7B;
658                         modem_ctl[0] |= 0x01;
659                         modem_ctl[1] |= 0x40;
660                         dbg("%s - flow control = NONE", __FUNCTION__);
661                 }
662
663                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
664                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
665                                 modem_ctl[2], modem_ctl[3]);
666                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
667         }
668
669 }
670
671 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
672                 unsigned int set, unsigned int clear)
673 {
674         int control = 0;
675
676         dbg("%s - port %d", __FUNCTION__, port->number);
677
678         if (set & TIOCM_RTS) {
679                 control |= CONTROL_RTS;
680                 control |= CONTROL_WRITE_RTS;
681         }
682         if (set & TIOCM_DTR) {
683                 control |= CONTROL_DTR;
684                 control |= CONTROL_WRITE_DTR;
685         }
686         if (clear & TIOCM_RTS) {
687                 control &= ~CONTROL_RTS;
688                 control |= CONTROL_WRITE_RTS;
689         }
690         if (clear & TIOCM_DTR) {
691                 control &= ~CONTROL_DTR;
692                 control |= CONTROL_WRITE_DTR;
693         }
694
695         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
696
697         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
698
699 }
700
701 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
702 {
703         int control, result;
704
705         dbg("%s - port %d", __FUNCTION__, port->number);
706
707         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
708
709         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
710                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
711                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
712                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
713                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
714                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
715
716         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
717
718         return result;
719 }
720
721 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
722 {
723         int state;
724
725         dbg("%s - port %d", __FUNCTION__, port->number);
726         if (break_state == 0)
727                 state = BREAK_OFF;
728         else
729                 state = BREAK_ON;
730         dbg("%s - turning break %s", __FUNCTION__,
731                         state==BREAK_OFF ? "off" : "on");
732         cp2101_set_config(port, CP2101_BREAK, &state, 2);
733 }
734
735 static int cp2101_startup (struct usb_serial *serial)
736 {
737         /* CP2101 buffers behave strangely unless device is reset */
738         usb_reset_device(serial->dev);
739         return 0;
740 }
741
742 static void cp2101_shutdown (struct usb_serial *serial)
743 {
744         int i;
745
746         dbg("%s", __FUNCTION__);
747
748         /* Stop reads and writes on all ports */
749         for (i=0; i < serial->num_ports; ++i) {
750                 cp2101_cleanup(serial->port[i]);
751         }
752 }
753
754 static int __init cp2101_init (void)
755 {
756         int retval;
757
758         retval = usb_serial_register(&cp2101_device);
759         if (retval)
760                 return retval; /* Failed to register */
761
762         retval = usb_register(&cp2101_driver);
763         if (retval) {
764                 /* Failed to register */
765                 usb_serial_deregister(&cp2101_device);
766                 return retval;
767         }
768
769         /* Success */
770         info(DRIVER_DESC " " DRIVER_VERSION);
771         return 0;
772 }
773
774 static void __exit cp2101_exit (void)
775 {
776         usb_deregister (&cp2101_driver);
777         usb_serial_deregister (&cp2101_device);
778 }
779
780 module_init(cp2101_init);
781 module_exit(cp2101_exit);
782
783 MODULE_DESCRIPTION(DRIVER_DESC);
784 MODULE_VERSION(DRIVER_VERSION);
785 MODULE_LICENSE("GPL");
786
787 module_param(debug, bool, S_IRUGO | S_IWUSR);
788 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");