Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/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(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
57         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
58         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
59         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
60         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
63         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
64         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
65         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
66         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
67         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
68         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
69         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
70         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
71         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
72         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
73         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
74         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
75         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
76         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
77         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
78         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
79         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
80         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
81         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
82         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
83         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
84         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
85         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
86         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
87         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
88         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
89         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
90         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
91         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
92         { } /* Terminating Entry */
93 };
94
95 MODULE_DEVICE_TABLE (usb, id_table);
96
97 static struct usb_driver cp2101_driver = {
98         .name           = "cp2101",
99         .probe          = usb_serial_probe,
100         .disconnect     = usb_serial_disconnect,
101         .id_table       = id_table,
102         .no_dynamic_id  =       1,
103 };
104
105 static struct usb_serial_driver cp2101_device = {
106         .driver = {
107                 .owner =        THIS_MODULE,
108                 .name =         "cp2101",
109         },
110         .usb_driver             = &cp2101_driver,
111         .id_table               = id_table,
112         .num_ports              = 1,
113         .open                   = cp2101_open,
114         .close                  = cp2101_close,
115         .break_ctl              = cp2101_break_ctl,
116         .set_termios            = cp2101_set_termios,
117         .tiocmget               = cp2101_tiocmget,
118         .tiocmset               = cp2101_tiocmset,
119         .attach                 = cp2101_startup,
120         .shutdown               = cp2101_shutdown,
121 };
122
123 /* Config request types */
124 #define REQTYPE_HOST_TO_DEVICE  0x41
125 #define REQTYPE_DEVICE_TO_HOST  0xc1
126
127 /* Config SET requests. To GET, add 1 to the request number */
128 #define CP2101_UART             0x00    /* Enable / Disable */
129 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
130 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
131 #define CP2101_BREAK            0x05    /* On / Off */
132 #define CP2101_CONTROL          0x07    /* Flow control line states */
133 #define CP2101_MODEMCTL         0x13    /* Modem controls */
134 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
135
136 /* CP2101_UART */
137 #define UART_ENABLE             0x0001
138 #define UART_DISABLE            0x0000
139
140 /* CP2101_BAUDRATE */
141 #define BAUD_RATE_GEN_FREQ      0x384000
142
143 /* CP2101_BITS */
144 #define BITS_DATA_MASK          0X0f00
145 #define BITS_DATA_5             0X0500
146 #define BITS_DATA_6             0X0600
147 #define BITS_DATA_7             0X0700
148 #define BITS_DATA_8             0X0800
149 #define BITS_DATA_9             0X0900
150
151 #define BITS_PARITY_MASK        0x00f0
152 #define BITS_PARITY_NONE        0x0000
153 #define BITS_PARITY_ODD         0x0010
154 #define BITS_PARITY_EVEN        0x0020
155 #define BITS_PARITY_MARK        0x0030
156 #define BITS_PARITY_SPACE       0x0040
157
158 #define BITS_STOP_MASK          0x000f
159 #define BITS_STOP_1             0x0000
160 #define BITS_STOP_1_5           0x0001
161 #define BITS_STOP_2             0x0002
162
163 /* CP2101_BREAK */
164 #define BREAK_ON                0x0000
165 #define BREAK_OFF               0x0001
166
167 /* CP2101_CONTROL */
168 #define CONTROL_DTR             0x0001
169 #define CONTROL_RTS             0x0002
170 #define CONTROL_CTS             0x0010
171 #define CONTROL_DSR             0x0020
172 #define CONTROL_RING            0x0040
173 #define CONTROL_DCD             0x0080
174 #define CONTROL_WRITE_DTR       0x0100
175 #define CONTROL_WRITE_RTS       0x0200
176
177 /*
178  * cp2101_get_config
179  * Reads from the CP2101 configuration registers
180  * 'size' is specified in bytes.
181  * 'data' is a pointer to a pre-allocated array of integers large
182  * enough to hold 'size' bytes (with 4 bytes to each integer)
183  */
184 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
185                 unsigned int *data, int size)
186 {
187         struct usb_serial *serial = port->serial;
188         __le32 *buf;
189         int result, i, length;
190
191         /* Number of integers required to contain the array */
192         length = (((size - 1) | 3) + 1)/4;
193
194         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
195         if (!buf) {
196                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
197                 return -ENOMEM;
198         }
199
200         /* For get requests, the request number must be incremented */
201         request++;
202
203         /* Issue the request, attempting to read 'size' bytes */
204         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
205                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
206                                 0, buf, size, 300);
207
208         /* Convert data into an array of integers */
209         for (i=0; i<length; i++)
210                 data[i] = le32_to_cpu(buf[i]);
211
212         kfree(buf);
213
214         if (result != size) {
215                 dev_err(&port->dev, "%s - Unable to send config request, "
216                                 "request=0x%x size=%d result=%d\n",
217                                 __func__, request, size, result);
218                 return -EPROTO;
219         }
220
221         return 0;
222 }
223
224 /*
225  * cp2101_set_config
226  * Writes to the CP2101 configuration registers
227  * Values less than 16 bits wide are sent directly
228  * 'size' is specified in bytes.
229  */
230 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
231                 unsigned int *data, int size)
232 {
233         struct usb_serial *serial = port->serial;
234         __le32 *buf;
235         int result, i, length;
236
237         /* Number of integers required to contain the array */
238         length = (((size - 1) | 3) + 1)/4;
239
240         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
241         if (!buf) {
242                 dev_err(&port->dev, "%s - out of memory.\n",
243                                 __func__);
244                 return -ENOMEM;
245         }
246
247         /* Array of integers into bytes */
248         for (i = 0; i < length; i++)
249                 buf[i] = cpu_to_le32(data[i]);
250
251         if (size > 2) {
252                 result = usb_control_msg (serial->dev,
253                                 usb_sndctrlpipe(serial->dev, 0),
254                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
255                                 0, buf, size, 300);
256         } else {
257                 result = usb_control_msg (serial->dev,
258                                 usb_sndctrlpipe(serial->dev, 0),
259                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
260                                 0, NULL, 0, 300);
261         }
262
263         kfree(buf);
264
265         if ((size > 2 && result != size) || result < 0) {
266                 dev_err(&port->dev, "%s - Unable to send request, "
267                                 "request=0x%x size=%d result=%d\n",
268                                 __func__, request, size, result);
269                 return -EPROTO;
270         }
271
272         /* Single data value */
273         result = usb_control_msg (serial->dev,
274                         usb_sndctrlpipe(serial->dev, 0),
275                         request, REQTYPE_HOST_TO_DEVICE, data[0],
276                         0, NULL, 0, 300);
277         return 0;
278 }
279
280 /*
281  * cp2101_set_config_single
282  * Convenience function for calling cp2101_set_config on single data values
283  * without requiring an integer pointer
284  */
285 static inline int cp2101_set_config_single(struct usb_serial_port* port,
286                 u8 request, unsigned int data)
287 {
288         return cp2101_set_config(port, request, &data, 2);
289 }
290
291 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
292 {
293         struct usb_serial *serial = port->serial;
294         int result;
295
296         dbg("%s - port %d", __func__, port->number);
297
298         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
299                 dev_err(&port->dev, "%s - Unable to enable UART\n",
300                                 __func__);
301                 return -EPROTO;
302         }
303
304         /* Start reading from the device */
305         usb_fill_bulk_urb (port->read_urb, serial->dev,
306                         usb_rcvbulkpipe(serial->dev,
307                         port->bulk_in_endpointAddress),
308                         port->read_urb->transfer_buffer,
309                         port->read_urb->transfer_buffer_length,
310                         serial->type->read_bulk_callback,
311                         port);
312         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
313         if (result) {
314                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
315                                 "error %d\n", __func__, result);
316                 return result;
317         }
318
319         /* Configure the termios structure */
320         cp2101_get_termios(port);
321
322         /* Set the DTR and RTS pins low */
323         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
324
325         return 0;
326 }
327
328 static void cp2101_cleanup (struct usb_serial_port *port)
329 {
330         struct usb_serial *serial = port->serial;
331
332         dbg("%s - port %d", __func__, port->number);
333
334         if (serial->dev) {
335                 /* shutdown any bulk reads that might be going on */
336                 if (serial->num_bulk_out)
337                         usb_kill_urb(port->write_urb);
338                 if (serial->num_bulk_in)
339                         usb_kill_urb(port->read_urb);
340         }
341 }
342
343 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
344 {
345         dbg("%s - port %d", __func__, port->number);
346
347         /* shutdown our urbs */
348         dbg("%s - shutting down urbs", __func__);
349         usb_kill_urb(port->write_urb);
350         usb_kill_urb(port->read_urb);
351
352         mutex_lock(&port->serial->disc_mutex);
353         if (!port->serial->disconnected)
354                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
355         mutex_unlock(&port->serial->disc_mutex);
356 }
357
358 /*
359  * cp2101_get_termios
360  * Reads the baud rate, data bits, parity, stop bits and flow control mode
361  * from the device, corrects any unsupported values, and configures the
362  * termios structure to reflect the state of the device
363  */
364 static void cp2101_get_termios (struct usb_serial_port *port)
365 {
366         unsigned int cflag, modem_ctl[4];
367         int baud;
368         int bits;
369
370         dbg("%s - port %d", __func__, port->number);
371
372         if (!port->tty || !port->tty->termios) {
373                 dbg("%s - no tty structures", __func__);
374                 return;
375         }
376
377         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
378         /* Convert to baudrate */
379         if (baud)
380                 baud = BAUD_RATE_GEN_FREQ / baud;
381
382         dbg("%s - baud rate = %d", __func__, baud);
383
384         tty_encode_baud_rate(port->tty, baud, baud);
385         cflag = port->tty->termios->c_cflag;
386
387         cp2101_get_config(port, CP2101_BITS, &bits, 2);
388         cflag &= ~CSIZE;
389         switch(bits & BITS_DATA_MASK) {
390                 case BITS_DATA_5:
391                         dbg("%s - data bits = 5", __func__);
392                         cflag |= CS5;
393                         break;
394                 case BITS_DATA_6:
395                         dbg("%s - data bits = 6", __func__);
396                         cflag |= CS6;
397                         break;
398                 case BITS_DATA_7:
399                         dbg("%s - data bits = 7", __func__);
400                         cflag |= CS7;
401                         break;
402                 case BITS_DATA_8:
403                         dbg("%s - data bits = 8", __func__);
404                         cflag |= CS8;
405                         break;
406                 case BITS_DATA_9:
407                         dbg("%s - data bits = 9 (not supported, "
408                                         "using 8 data bits)", __func__);
409                         cflag |= CS8;
410                         bits &= ~BITS_DATA_MASK;
411                         bits |= BITS_DATA_8;
412                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
413                         break;
414                 default:
415                         dbg("%s - Unknown number of data bits, "
416                                         "using 8", __func__);
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         }
423
424         switch(bits & BITS_PARITY_MASK) {
425                 case BITS_PARITY_NONE:
426                         dbg("%s - parity = NONE", __func__);
427                         cflag &= ~PARENB;
428                         break;
429                 case BITS_PARITY_ODD:
430                         dbg("%s - parity = ODD", __func__);
431                         cflag |= (PARENB|PARODD);
432                         break;
433                 case BITS_PARITY_EVEN:
434                         dbg("%s - parity = EVEN", __func__);
435                         cflag &= ~PARODD;
436                         cflag |= PARENB;
437                         break;
438                 case BITS_PARITY_MARK:
439                         dbg("%s - parity = MARK (not supported, "
440                                         "disabling parity)", __func__);
441                         cflag &= ~PARENB;
442                         bits &= ~BITS_PARITY_MASK;
443                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
444                         break;
445                 case BITS_PARITY_SPACE:
446                         dbg("%s - parity = SPACE (not supported, "
447                                         "disabling parity)", __func__);
448                         cflag &= ~PARENB;
449                         bits &= ~BITS_PARITY_MASK;
450                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
451                         break;
452                 default:
453                         dbg("%s - Unknown parity mode, "
454                                         "disabling parity", __func__);
455                         cflag &= ~PARENB;
456                         bits &= ~BITS_PARITY_MASK;
457                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
458                         break;
459         }
460
461         cflag &= ~CSTOPB;
462         switch(bits & BITS_STOP_MASK) {
463                 case BITS_STOP_1:
464                         dbg("%s - stop bits = 1", __func__);
465                         break;
466                 case BITS_STOP_1_5:
467                         dbg("%s - stop bits = 1.5 (not supported, "
468                                         "using 1 stop bit)", __func__);
469                         bits &= ~BITS_STOP_MASK;
470                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
471                         break;
472                 case BITS_STOP_2:
473                         dbg("%s - stop bits = 2", __func__);
474                         cflag |= CSTOPB;
475                         break;
476                 default:
477                         dbg("%s - Unknown number of stop bits, "
478                                         "using 1 stop bit", __func__);
479                         bits &= ~BITS_STOP_MASK;
480                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
481                         break;
482         }
483
484         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
485         if (modem_ctl[0] & 0x0008) {
486                 dbg("%s - flow control = CRTSCTS", __func__);
487                 cflag |= CRTSCTS;
488         } else {
489                 dbg("%s - flow control = NONE", __func__);
490                 cflag &= ~CRTSCTS;
491         }
492
493         port->tty->termios->c_cflag = cflag;
494 }
495
496 static void cp2101_set_termios (struct usb_serial_port *port,
497                 struct ktermios *old_termios)
498 {
499         unsigned int cflag, old_cflag;
500         int baud=0, bits;
501         unsigned int modem_ctl[4];
502
503         dbg("%s - port %d", __func__, port->number);
504
505         if (!port->tty || !port->tty->termios) {
506                 dbg("%s - no tty structures", __func__);
507                 return;
508         }
509         port->tty->termios->c_cflag &= ~CMSPAR;
510
511         cflag = port->tty->termios->c_cflag;
512         old_cflag = old_termios->c_cflag;
513         baud = tty_get_baud_rate(port->tty);
514
515         /* If the baud rate is to be updated*/
516         if (baud != tty_termios_baud_rate(old_termios)) {
517                 switch (baud) {
518                         case 0:
519                         case 600:
520                         case 1200:
521                         case 1800:
522                         case 2400:
523                         case 4800:
524                         case 7200:
525                         case 9600:
526                         case 14400:
527                         case 19200:
528                         case 28800:
529                         case 38400:
530                         case 55854:
531                         case 57600:
532                         case 115200:
533                         case 127117:
534                         case 230400:
535                         case 460800:
536                         case 921600:
537                         case 3686400:
538                                 break;
539                         default:
540                                 baud = 9600;
541                                 break;
542                 }
543
544                 if (baud) {
545                         dbg("%s - Setting baud rate to %d baud", __func__,
546                                         baud);
547                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
548                                                 (BAUD_RATE_GEN_FREQ / baud))) {
549                                 dev_err(&port->dev, "Baud rate requested not "
550                                                 "supported by device\n");
551                                 baud = tty_termios_baud_rate(old_termios);
552                         }
553                 }
554         }
555         /* Report back the resulting baud rate */
556         tty_encode_baud_rate(port->tty, baud, baud);
557
558         /* If the number of data bits is to be updated */
559         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
560                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
561                 bits &= ~BITS_DATA_MASK;
562                 switch (cflag & CSIZE) {
563                         case CS5:
564                                 bits |= BITS_DATA_5;
565                                 dbg("%s - data bits = 5", __func__);
566                                 break;
567                         case CS6:
568                                 bits |= BITS_DATA_6;
569                                 dbg("%s - data bits = 6", __func__);
570                                 break;
571                         case CS7:
572                                 bits |= BITS_DATA_7;
573                                 dbg("%s - data bits = 7", __func__);
574                                 break;
575                         case CS8:
576                                 bits |= BITS_DATA_8;
577                                 dbg("%s - data bits = 8", __func__);
578                                 break;
579                         /*case CS9:
580                                 bits |= BITS_DATA_9;
581                                 dbg("%s - data bits = 9", __func__);
582                                 break;*/
583                         default:
584                                 dev_err(&port->dev, "cp2101 driver does not "
585                                         "support the number of bits requested,"
586                                         " using 8 bit mode\n");
587                                 bits |= BITS_DATA_8;
588                                 break;
589                 }
590                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
591                         dev_err(&port->dev, "Number of data bits requested "
592                                         "not supported by device\n");
593         }
594
595         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
596                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
597                 bits &= ~BITS_PARITY_MASK;
598                 if (cflag & PARENB) {
599                         if (cflag & PARODD) {
600                                 bits |= BITS_PARITY_ODD;
601                                 dbg("%s - parity = ODD", __func__);
602                         } else {
603                                 bits |= BITS_PARITY_EVEN;
604                                 dbg("%s - parity = EVEN", __func__);
605                         }
606                 }
607                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
608                         dev_err(&port->dev, "Parity mode not supported "
609                                         "by device\n");
610         }
611
612         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
613                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
614                 bits &= ~BITS_STOP_MASK;
615                 if (cflag & CSTOPB) {
616                         bits |= BITS_STOP_2;
617                         dbg("%s - stop bits = 2", __func__);
618                 } else {
619                         bits |= BITS_STOP_1;
620                         dbg("%s - stop bits = 1", __func__);
621                 }
622                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
623                         dev_err(&port->dev, "Number of stop bits requested "
624                                         "not supported by device\n");
625         }
626
627         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
628                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
629                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
630                                 __func__, modem_ctl[0], modem_ctl[1],
631                                 modem_ctl[2], modem_ctl[3]);
632
633                 if (cflag & CRTSCTS) {
634                         modem_ctl[0] &= ~0x7B;
635                         modem_ctl[0] |= 0x09;
636                         modem_ctl[1] = 0x80;
637                         dbg("%s - flow control = CRTSCTS", __func__);
638                 } else {
639                         modem_ctl[0] &= ~0x7B;
640                         modem_ctl[0] |= 0x01;
641                         modem_ctl[1] |= 0x40;
642                         dbg("%s - flow control = NONE", __func__);
643                 }
644
645                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
646                                 __func__, modem_ctl[0], modem_ctl[1],
647                                 modem_ctl[2], modem_ctl[3]);
648                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
649         }
650
651 }
652
653 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
654                 unsigned int set, unsigned int clear)
655 {
656         int control = 0;
657
658         dbg("%s - port %d", __func__, port->number);
659
660         if (set & TIOCM_RTS) {
661                 control |= CONTROL_RTS;
662                 control |= CONTROL_WRITE_RTS;
663         }
664         if (set & TIOCM_DTR) {
665                 control |= CONTROL_DTR;
666                 control |= CONTROL_WRITE_DTR;
667         }
668         if (clear & TIOCM_RTS) {
669                 control &= ~CONTROL_RTS;
670                 control |= CONTROL_WRITE_RTS;
671         }
672         if (clear & TIOCM_DTR) {
673                 control &= ~CONTROL_DTR;
674                 control |= CONTROL_WRITE_DTR;
675         }
676
677         dbg("%s - control = 0x%.4x", __func__, control);
678
679         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
680
681 }
682
683 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
684 {
685         int control, result;
686
687         dbg("%s - port %d", __func__, port->number);
688
689         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
690
691         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
692                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
693                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
694                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
695                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
696                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
697
698         dbg("%s - control = 0x%.2x", __func__, control);
699
700         return result;
701 }
702
703 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
704 {
705         int state;
706
707         dbg("%s - port %d", __func__, port->number);
708         if (break_state == 0)
709                 state = BREAK_OFF;
710         else
711                 state = BREAK_ON;
712         dbg("%s - turning break %s", __func__,
713                         state==BREAK_OFF ? "off" : "on");
714         cp2101_set_config(port, CP2101_BREAK, &state, 2);
715 }
716
717 static int cp2101_startup (struct usb_serial *serial)
718 {
719         /* CP2101 buffers behave strangely unless device is reset */
720         usb_reset_device(serial->dev);
721         return 0;
722 }
723
724 static void cp2101_shutdown (struct usb_serial *serial)
725 {
726         int i;
727
728         dbg("%s", __func__);
729
730         /* Stop reads and writes on all ports */
731         for (i=0; i < serial->num_ports; ++i) {
732                 cp2101_cleanup(serial->port[i]);
733         }
734 }
735
736 static int __init cp2101_init (void)
737 {
738         int retval;
739
740         retval = usb_serial_register(&cp2101_device);
741         if (retval)
742                 return retval; /* Failed to register */
743
744         retval = usb_register(&cp2101_driver);
745         if (retval) {
746                 /* Failed to register */
747                 usb_serial_deregister(&cp2101_device);
748                 return retval;
749         }
750
751         /* Success */
752         info(DRIVER_DESC " " DRIVER_VERSION);
753         return 0;
754 }
755
756 static void __exit cp2101_exit (void)
757 {
758         usb_deregister (&cp2101_driver);
759         usb_serial_deregister (&cp2101_device);
760 }
761
762 module_init(cp2101_init);
763 module_exit(cp2101_exit);
764
765 MODULE_DESCRIPTION(DRIVER_DESC);
766 MODULE_VERSION(DRIVER_VERSION);
767 MODULE_LICENSE("GPL");
768
769 module_param(debug, bool, S_IRUGO | S_IWUSR);
770 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");