Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / drivers / usb / serial / cp2101.c
1 /*
2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
3  *
4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License version
8  *      2 as published by the Free Software Foundation.
9  *
10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12  * control thanks to Munir Nassar nassarmu@real-time.com
13  *
14  * Outstanding Issues:
15  *  Buffers are not flushed when the port is opened.
16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
17  *
18  */
19
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/slab.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/usb.h>
28 #include <asm/uaccess.h>
29 #include <linux/usb/serial.h>
30
31 /*
32  * Version Information
33  */
34 #define DRIVER_VERSION "v0.07"
35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
36
37 /*
38  * Function Prototypes
39  */
40 static int cp2101_open(struct usb_serial_port*, struct file*);
41 static void cp2101_cleanup(struct usb_serial_port*);
42 static void cp2101_close(struct usb_serial_port*, struct file*);
43 static void cp2101_get_termios(struct usb_serial_port*);
44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
47                 unsigned int, unsigned int);
48 static void cp2101_break_ctl(struct usb_serial_port*, int);
49 static int cp2101_startup (struct usb_serial *);
50 static void cp2101_shutdown(struct usb_serial*);
51
52
53 static int debug;
54
55 static struct usb_device_id id_table [] = {
56         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
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, 0x8053) }, /* Enfora EDG1228 */
63         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
64         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
65         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
66         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
67         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
68         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
69         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
70         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
71         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
72         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
73         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
74         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
75         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
76         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
77         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
78         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
79         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
80         { } /* Terminating Entry */
81 };
82
83 MODULE_DEVICE_TABLE (usb, id_table);
84
85 static struct usb_driver cp2101_driver = {
86         .name           = "cp2101",
87         .probe          = usb_serial_probe,
88         .disconnect     = usb_serial_disconnect,
89         .id_table       = id_table,
90         .no_dynamic_id  =       1,
91 };
92
93 static struct usb_serial_driver cp2101_device = {
94         .driver = {
95                 .owner =        THIS_MODULE,
96                 .name =         "cp2101",
97         },
98         .usb_driver             = &cp2101_driver,
99         .id_table               = id_table,
100         .num_interrupt_in       = 0,
101         .num_bulk_in            = 0,
102         .num_bulk_out           = 0,
103         .num_ports              = 1,
104         .open                   = cp2101_open,
105         .close                  = cp2101_close,
106         .break_ctl              = cp2101_break_ctl,
107         .set_termios            = cp2101_set_termios,
108         .tiocmget               = cp2101_tiocmget,
109         .tiocmset               = cp2101_tiocmset,
110         .attach                 = cp2101_startup,
111         .shutdown               = cp2101_shutdown,
112 };
113
114 /* Config request types */
115 #define REQTYPE_HOST_TO_DEVICE  0x41
116 #define REQTYPE_DEVICE_TO_HOST  0xc1
117
118 /* Config SET requests. To GET, add 1 to the request number */
119 #define CP2101_UART             0x00    /* Enable / Disable */
120 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
121 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
122 #define CP2101_BREAK            0x05    /* On / Off */
123 #define CP2101_CONTROL          0x07    /* Flow control line states */
124 #define CP2101_MODEMCTL         0x13    /* Modem controls */
125 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
126
127 /* CP2101_UART */
128 #define UART_ENABLE             0x0001
129 #define UART_DISABLE            0x0000
130
131 /* CP2101_BAUDRATE */
132 #define BAUD_RATE_GEN_FREQ      0x384000
133
134 /* CP2101_BITS */
135 #define BITS_DATA_MASK          0X0f00
136 #define BITS_DATA_5             0X0500
137 #define BITS_DATA_6             0X0600
138 #define BITS_DATA_7             0X0700
139 #define BITS_DATA_8             0X0800
140 #define BITS_DATA_9             0X0900
141
142 #define BITS_PARITY_MASK        0x00f0
143 #define BITS_PARITY_NONE        0x0000
144 #define BITS_PARITY_ODD         0x0010
145 #define BITS_PARITY_EVEN        0x0020
146 #define BITS_PARITY_MARK        0x0030
147 #define BITS_PARITY_SPACE       0x0040
148
149 #define BITS_STOP_MASK          0x000f
150 #define BITS_STOP_1             0x0000
151 #define BITS_STOP_1_5           0x0001
152 #define BITS_STOP_2             0x0002
153
154 /* CP2101_BREAK */
155 #define BREAK_ON                0x0000
156 #define BREAK_OFF               0x0001
157
158 /* CP2101_CONTROL */
159 #define CONTROL_DTR             0x0001
160 #define CONTROL_RTS             0x0002
161 #define CONTROL_CTS             0x0010
162 #define CONTROL_DSR             0x0020
163 #define CONTROL_RING            0x0040
164 #define CONTROL_DCD             0x0080
165 #define CONTROL_WRITE_DTR       0x0100
166 #define CONTROL_WRITE_RTS       0x0200
167
168 /*
169  * cp2101_get_config
170  * Reads from the CP2101 configuration registers
171  * 'size' is specified in bytes.
172  * 'data' is a pointer to a pre-allocated array of integers large
173  * enough to hold 'size' bytes (with 4 bytes to each integer)
174  */
175 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
176                 unsigned int *data, int size)
177 {
178         struct usb_serial *serial = port->serial;
179         __le32 *buf;
180         int result, i, length;
181
182         /* Number of integers required to contain the array */
183         length = (((size - 1) | 3) + 1)/4;
184
185         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
186         if (!buf) {
187                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
188                 return -ENOMEM;
189         }
190
191         /* For get requests, the request number must be incremented */
192         request++;
193
194         /* Issue the request, attempting to read 'size' bytes */
195         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
196                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
197                                 0, buf, size, 300);
198
199         /* Convert data into an array of integers */
200         for (i=0; i<length; i++)
201                 data[i] = le32_to_cpu(buf[i]);
202
203         kfree(buf);
204
205         if (result != size) {
206                 dev_err(&port->dev, "%s - Unable to send config request, "
207                                 "request=0x%x size=%d result=%d\n",
208                                 __FUNCTION__, request, size, result);
209                 return -EPROTO;
210         }
211
212         return 0;
213 }
214
215 /*
216  * cp2101_set_config
217  * Writes to the CP2101 configuration registers
218  * Values less than 16 bits wide are sent directly
219  * 'size' is specified in bytes.
220  */
221 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
222                 unsigned int *data, int size)
223 {
224         struct usb_serial *serial = port->serial;
225         __le32 *buf;
226         int result, i, length;
227
228         /* Number of integers required to contain the array */
229         length = (((size - 1) | 3) + 1)/4;
230
231         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
232         if (!buf) {
233                 dev_err(&port->dev, "%s - out of memory.\n",
234                                 __FUNCTION__);
235                 return -ENOMEM;
236         }
237
238         /* Array of integers into bytes */
239         for (i = 0; i < length; i++)
240                 buf[i] = cpu_to_le32(data[i]);
241
242         if (size > 2) {
243                 result = usb_control_msg (serial->dev,
244                                 usb_sndctrlpipe(serial->dev, 0),
245                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
246                                 0, buf, size, 300);
247         } else {
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         }
253
254         kfree(buf);
255
256         if ((size > 2 && result != size) || result < 0) {
257                 dev_err(&port->dev, "%s - Unable to send request, "
258                                 "request=0x%x size=%d result=%d\n",
259                                 __FUNCTION__, request, size, result);
260                 return -EPROTO;
261         }
262
263         /* Single data value */
264         result = usb_control_msg (serial->dev,
265                         usb_sndctrlpipe(serial->dev, 0),
266                         request, REQTYPE_HOST_TO_DEVICE, data[0],
267                         0, NULL, 0, 300);
268         return 0;
269 }
270
271 /*
272  * cp2101_set_config_single
273  * Convenience function for calling cp2101_set_config on single data values
274  * without requiring an integer pointer
275  */
276 static inline int cp2101_set_config_single(struct usb_serial_port* port,
277                 u8 request, unsigned int data)
278 {
279         return cp2101_set_config(port, request, &data, 2);
280 }
281
282 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
283 {
284         struct usb_serial *serial = port->serial;
285         int result;
286
287         dbg("%s - port %d", __FUNCTION__, port->number);
288
289         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
290                 dev_err(&port->dev, "%s - Unable to enable UART\n",
291                                 __FUNCTION__);
292                 return -EPROTO;
293         }
294
295         /* Start reading from the device */
296         usb_fill_bulk_urb (port->read_urb, serial->dev,
297                         usb_rcvbulkpipe(serial->dev,
298                         port->bulk_in_endpointAddress),
299                         port->read_urb->transfer_buffer,
300                         port->read_urb->transfer_buffer_length,
301                         serial->type->read_bulk_callback,
302                         port);
303         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
304         if (result) {
305                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
306                                 "error %d\n", __FUNCTION__, result);
307                 return result;
308         }
309
310         /* Configure the termios structure */
311         cp2101_get_termios(port);
312
313         /* Set the DTR and RTS pins low */
314         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
315
316         return 0;
317 }
318
319 static void cp2101_cleanup (struct usb_serial_port *port)
320 {
321         struct usb_serial *serial = port->serial;
322
323         dbg("%s - port %d", __FUNCTION__, port->number);
324
325         if (serial->dev) {
326                 /* shutdown any bulk reads that might be going on */
327                 if (serial->num_bulk_out)
328                         usb_kill_urb(port->write_urb);
329                 if (serial->num_bulk_in)
330                         usb_kill_urb(port->read_urb);
331         }
332 }
333
334 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
335 {
336         dbg("%s - port %d", __FUNCTION__, port->number);
337
338         /* shutdown our urbs */
339         dbg("%s - shutting down urbs", __FUNCTION__);
340         usb_kill_urb(port->write_urb);
341         usb_kill_urb(port->read_urb);
342
343         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
344 }
345
346 /*
347  * cp2101_get_termios
348  * Reads the baud rate, data bits, parity, stop bits and flow control mode
349  * from the device, corrects any unsupported values, and configures the
350  * termios structure to reflect the state of the device
351  */
352 static void cp2101_get_termios (struct usb_serial_port *port)
353 {
354         unsigned int cflag, modem_ctl[4];
355         int baud;
356         int bits;
357
358         dbg("%s - port %d", __FUNCTION__, port->number);
359
360         if (!port->tty || !port->tty->termios) {
361                 dbg("%s - no tty structures", __FUNCTION__);
362                 return;
363         }
364         cflag = port->tty->termios->c_cflag;
365
366         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
367         /* Convert to baudrate */
368         if (baud)
369                 baud = BAUD_RATE_GEN_FREQ / baud;
370
371         dbg("%s - baud rate = %d", __FUNCTION__, baud);
372         cflag &= ~CBAUD;
373         switch (baud) {
374                 /*
375                  * The baud rates which are commented out below
376                  * appear to be supported by the device
377                  * but are non-standard
378                  */
379                 case 600:       cflag |= B600;          break;
380                 case 1200:      cflag |= B1200;         break;
381                 case 1800:      cflag |= B1800;         break;
382                 case 2400:      cflag |= B2400;         break;
383                 case 4800:      cflag |= B4800;         break;
384                 /*case 7200:    cflag |= B7200;         break;*/
385                 case 9600:      cflag |= B9600;         break;
386                 /*case 14400:   cflag |= B14400;        break;*/
387                 case 19200:     cflag |= B19200;        break;
388                 /*case 28800:   cflag |= B28800;        break;*/
389                 case 38400:     cflag |= B38400;        break;
390                 /*case 55854:   cflag |= B55054;        break;*/
391                 case 57600:     cflag |= B57600;        break;
392                 case 115200:    cflag |= B115200;       break;
393                 /*case 127117:  cflag |= B127117;       break;*/
394                 case 230400:    cflag |= B230400;       break;
395                 case 460800:    cflag |= B460800;       break;
396                 case 921600:    cflag |= B921600;       break;
397                 /*case 3686400: cflag |= B3686400;      break;*/
398                 default:
399                         dbg("%s - Baud rate is not supported, "
400                                         "using 9600 baud", __FUNCTION__);
401                         cflag |= B9600;
402                         cp2101_set_config_single(port, CP2101_BAUDRATE,
403                                         (BAUD_RATE_GEN_FREQ/9600));
404                         break;
405         }
406
407         cp2101_get_config(port, CP2101_BITS, &bits, 2);
408         cflag &= ~CSIZE;
409         switch(bits & BITS_DATA_MASK) {
410                 case BITS_DATA_5:
411                         dbg("%s - data bits = 5", __FUNCTION__);
412                         cflag |= CS5;
413                         break;
414                 case BITS_DATA_6:
415                         dbg("%s - data bits = 6", __FUNCTION__);
416                         cflag |= CS6;
417                         break;
418                 case BITS_DATA_7:
419                         dbg("%s - data bits = 7", __FUNCTION__);
420                         cflag |= CS7;
421                         break;
422                 case BITS_DATA_8:
423                         dbg("%s - data bits = 8", __FUNCTION__);
424                         cflag |= CS8;
425                         break;
426                 case BITS_DATA_9:
427                         dbg("%s - data bits = 9 (not supported, "
428                                         "using 8 data bits)", __FUNCTION__);
429                         cflag |= CS8;
430                         bits &= ~BITS_DATA_MASK;
431                         bits |= BITS_DATA_8;
432                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
433                         break;
434                 default:
435                         dbg("%s - Unknown number of data bits, "
436                                         "using 8", __FUNCTION__);
437                         cflag |= CS8;
438                         bits &= ~BITS_DATA_MASK;
439                         bits |= BITS_DATA_8;
440                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
441                         break;
442         }
443
444         switch(bits & BITS_PARITY_MASK) {
445                 case BITS_PARITY_NONE:
446                         dbg("%s - parity = NONE", __FUNCTION__);
447                         cflag &= ~PARENB;
448                         break;
449                 case BITS_PARITY_ODD:
450                         dbg("%s - parity = ODD", __FUNCTION__);
451                         cflag |= (PARENB|PARODD);
452                         break;
453                 case BITS_PARITY_EVEN:
454                         dbg("%s - parity = EVEN", __FUNCTION__);
455                         cflag &= ~PARODD;
456                         cflag |= PARENB;
457                         break;
458                 case BITS_PARITY_MARK:
459                         dbg("%s - parity = MARK (not supported, "
460                                         "disabling parity)", __FUNCTION__);
461                         cflag &= ~PARENB;
462                         bits &= ~BITS_PARITY_MASK;
463                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
464                         break;
465                 case BITS_PARITY_SPACE:
466                         dbg("%s - parity = SPACE (not supported, "
467                                         "disabling parity)", __FUNCTION__);
468                         cflag &= ~PARENB;
469                         bits &= ~BITS_PARITY_MASK;
470                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
471                         break;
472                 default:
473                         dbg("%s - Unknown parity mode, "
474                                         "disabling parity", __FUNCTION__);
475                         cflag &= ~PARENB;
476                         bits &= ~BITS_PARITY_MASK;
477                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
478                         break;
479         }
480
481         cflag &= ~CSTOPB;
482         switch(bits & BITS_STOP_MASK) {
483                 case BITS_STOP_1:
484                         dbg("%s - stop bits = 1", __FUNCTION__);
485                         break;
486                 case BITS_STOP_1_5:
487                         dbg("%s - stop bits = 1.5 (not supported, "
488                                         "using 1 stop bit)", __FUNCTION__);
489                         bits &= ~BITS_STOP_MASK;
490                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
491                         break;
492                 case BITS_STOP_2:
493                         dbg("%s - stop bits = 2", __FUNCTION__);
494                         cflag |= CSTOPB;
495                         break;
496                 default:
497                         dbg("%s - Unknown number of stop bits, "
498                                         "using 1 stop bit", __FUNCTION__);
499                         bits &= ~BITS_STOP_MASK;
500                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
501                         break;
502         }
503
504         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
505         if (modem_ctl[0] & 0x0008) {
506                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
507                 cflag |= CRTSCTS;
508         } else {
509                 dbg("%s - flow control = NONE", __FUNCTION__);
510                 cflag &= ~CRTSCTS;
511         }
512
513         port->tty->termios->c_cflag = cflag;
514 }
515
516 static void cp2101_set_termios (struct usb_serial_port *port,
517                 struct ktermios *old_termios)
518 {
519         unsigned int cflag, old_cflag=0;
520         int baud=0, bits;
521         unsigned int modem_ctl[4];
522
523         dbg("%s - port %d", __FUNCTION__, port->number);
524
525         if (!port->tty || !port->tty->termios) {
526                 dbg("%s - no tty structures", __FUNCTION__);
527                 return;
528         }
529         cflag = port->tty->termios->c_cflag;
530         old_cflag = old_termios->c_cflag;
531         baud = tty_get_baud_rate(port->tty);
532
533         /* If the baud rate is to be updated*/
534         if (baud != tty_termios_baud_rate(old_termios)) {
535                 switch (baud) {
536                         case 0:
537                         case 600:
538                         case 1200:
539                         case 1800:
540                         case 2400:
541                         case 4800:
542                         case 7200:
543                         case 9600:
544                         case 14400:
545                         case 19200:
546                         case 28800:
547                         case 38400:
548                         case 55854:
549                         case 57600:
550                         case 115200:
551                         case 127117:
552                         case 230400:
553                         case 460800:
554                         case 921600:
555                         case 3686400:
556                                 break;
557                         default:
558                                 baud = 9600;
559                                 break;
560                 }
561
562                 if (baud) {
563                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
564                                         baud);
565                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
566                                                 (BAUD_RATE_GEN_FREQ / baud)))
567                                 dev_err(&port->dev, "Baud rate requested not "
568                                                 "supported by device\n");
569                 }
570         }
571
572         /* If the number of data bits is to be updated */
573         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
574                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
575                 bits &= ~BITS_DATA_MASK;
576                 switch (cflag & CSIZE) {
577                         case CS5:
578                                 bits |= BITS_DATA_5;
579                                 dbg("%s - data bits = 5", __FUNCTION__);
580                                 break;
581                         case CS6:
582                                 bits |= BITS_DATA_6;
583                                 dbg("%s - data bits = 6", __FUNCTION__);
584                                 break;
585                         case CS7:
586                                 bits |= BITS_DATA_7;
587                                 dbg("%s - data bits = 7", __FUNCTION__);
588                                 break;
589                         case CS8:
590                                 bits |= BITS_DATA_8;
591                                 dbg("%s - data bits = 8", __FUNCTION__);
592                                 break;
593                         /*case CS9:
594                                 bits |= BITS_DATA_9;
595                                 dbg("%s - data bits = 9", __FUNCTION__);
596                                 break;*/
597                         default:
598                                 dev_err(&port->dev, "cp2101 driver does not "
599                                         "support the number of bits requested,"
600                                         " using 8 bit mode\n");
601                                 bits |= BITS_DATA_8;
602                                 break;
603                 }
604                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
605                         dev_err(&port->dev, "Number of data bits requested "
606                                         "not supported by device\n");
607         }
608
609         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
610                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
611                 bits &= ~BITS_PARITY_MASK;
612                 if (cflag & PARENB) {
613                         if (cflag & PARODD) {
614                                 bits |= BITS_PARITY_ODD;
615                                 dbg("%s - parity = ODD", __FUNCTION__);
616                         } else {
617                                 bits |= BITS_PARITY_EVEN;
618                                 dbg("%s - parity = EVEN", __FUNCTION__);
619                         }
620                 }
621                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
622                         dev_err(&port->dev, "Parity mode not supported "
623                                         "by device\n");
624         }
625
626         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
627                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
628                 bits &= ~BITS_STOP_MASK;
629                 if (cflag & CSTOPB) {
630                         bits |= BITS_STOP_2;
631                         dbg("%s - stop bits = 2", __FUNCTION__);
632                 } else {
633                         bits |= BITS_STOP_1;
634                         dbg("%s - stop bits = 1", __FUNCTION__);
635                 }
636                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
637                         dev_err(&port->dev, "Number of stop bits requested "
638                                         "not supported by device\n");
639         }
640
641         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
642                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
643                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
644                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
645                                 modem_ctl[2], modem_ctl[3]);
646
647                 if (cflag & CRTSCTS) {
648                         modem_ctl[0] &= ~0x7B;
649                         modem_ctl[0] |= 0x09;
650                         modem_ctl[1] = 0x80;
651                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
652                 } else {
653                         modem_ctl[0] &= ~0x7B;
654                         modem_ctl[0] |= 0x01;
655                         modem_ctl[1] |= 0x40;
656                         dbg("%s - flow control = NONE", __FUNCTION__);
657                 }
658
659                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
660                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
661                                 modem_ctl[2], modem_ctl[3]);
662                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
663         }
664
665 }
666
667 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
668                 unsigned int set, unsigned int clear)
669 {
670         int control = 0;
671
672         dbg("%s - port %d", __FUNCTION__, port->number);
673
674         if (set & TIOCM_RTS) {
675                 control |= CONTROL_RTS;
676                 control |= CONTROL_WRITE_RTS;
677         }
678         if (set & TIOCM_DTR) {
679                 control |= CONTROL_DTR;
680                 control |= CONTROL_WRITE_DTR;
681         }
682         if (clear & TIOCM_RTS) {
683                 control &= ~CONTROL_RTS;
684                 control |= CONTROL_WRITE_RTS;
685         }
686         if (clear & TIOCM_DTR) {
687                 control &= ~CONTROL_DTR;
688                 control |= CONTROL_WRITE_DTR;
689         }
690
691         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
692
693         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
694
695 }
696
697 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
698 {
699         int control, result;
700
701         dbg("%s - port %d", __FUNCTION__, port->number);
702
703         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
704
705         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
706                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
707                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
708                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
709                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
710                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
711
712         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
713
714         return result;
715 }
716
717 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
718 {
719         int state;
720
721         dbg("%s - port %d", __FUNCTION__, port->number);
722         if (break_state == 0)
723                 state = BREAK_OFF;
724         else
725                 state = BREAK_ON;
726         dbg("%s - turning break %s", __FUNCTION__,
727                         state==BREAK_OFF ? "off" : "on");
728         cp2101_set_config(port, CP2101_BREAK, &state, 2);
729 }
730
731 static int cp2101_startup (struct usb_serial *serial)
732 {
733         /* CP2101 buffers behave strangely unless device is reset */
734         usb_reset_device(serial->dev);
735         return 0;
736 }
737
738 static void cp2101_shutdown (struct usb_serial *serial)
739 {
740         int i;
741
742         dbg("%s", __FUNCTION__);
743
744         /* Stop reads and writes on all ports */
745         for (i=0; i < serial->num_ports; ++i) {
746                 cp2101_cleanup(serial->port[i]);
747         }
748 }
749
750 static int __init cp2101_init (void)
751 {
752         int retval;
753
754         retval = usb_serial_register(&cp2101_device);
755         if (retval)
756                 return retval; /* Failed to register */
757
758         retval = usb_register(&cp2101_driver);
759         if (retval) {
760                 /* Failed to register */
761                 usb_serial_deregister(&cp2101_device);
762                 return retval;
763         }
764
765         /* Success */
766         info(DRIVER_DESC " " DRIVER_VERSION);
767         return 0;
768 }
769
770 static void __exit cp2101_exit (void)
771 {
772         usb_deregister (&cp2101_driver);
773         usb_serial_deregister (&cp2101_device);
774 }
775
776 module_init(cp2101_init);
777 module_exit(cp2101_exit);
778
779 MODULE_DESCRIPTION(DRIVER_DESC);
780 MODULE_VERSION(DRIVER_VERSION);
781 MODULE_LICENSE("GPL");
782
783 module_param(debug, bool, S_IRUGO | S_IWUSR);
784 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");