Merge branch 'kill-jffs' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/misc-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(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
57         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
58         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
59         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
60         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
61         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
66         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
67         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
68         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
69         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
70         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
71         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
72         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
73         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
74         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
75         { } /* Terminating Entry */
76 };
77
78 MODULE_DEVICE_TABLE (usb, id_table);
79
80 static struct usb_driver cp2101_driver = {
81         .name           = "cp2101",
82         .probe          = usb_serial_probe,
83         .disconnect     = usb_serial_disconnect,
84         .id_table       = id_table,
85         .no_dynamic_id  =       1,
86 };
87
88 static struct usb_serial_driver cp2101_device = {
89         .driver = {
90                 .owner =        THIS_MODULE,
91                 .name =         "cp2101",
92         },
93         .usb_driver             = &cp2101_driver,
94         .id_table               = id_table,
95         .num_interrupt_in       = 0,
96         .num_bulk_in            = 0,
97         .num_bulk_out           = 0,
98         .num_ports              = 1,
99         .open                   = cp2101_open,
100         .close                  = cp2101_close,
101         .break_ctl              = cp2101_break_ctl,
102         .set_termios            = cp2101_set_termios,
103         .tiocmget               = cp2101_tiocmget,
104         .tiocmset               = cp2101_tiocmset,
105         .attach                 = cp2101_startup,
106         .shutdown               = cp2101_shutdown,
107 };
108
109 /* Config request types */
110 #define REQTYPE_HOST_TO_DEVICE  0x41
111 #define REQTYPE_DEVICE_TO_HOST  0xc1
112
113 /* Config SET requests. To GET, add 1 to the request number */
114 #define CP2101_UART             0x00    /* Enable / Disable */
115 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
116 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
117 #define CP2101_BREAK            0x05    /* On / Off */
118 #define CP2101_CONTROL          0x07    /* Flow control line states */
119 #define CP2101_MODEMCTL         0x13    /* Modem controls */
120 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
121
122 /* CP2101_UART */
123 #define UART_ENABLE             0x0001
124 #define UART_DISABLE            0x0000
125
126 /* CP2101_BAUDRATE */
127 #define BAUD_RATE_GEN_FREQ      0x384000
128
129 /* CP2101_BITS */
130 #define BITS_DATA_MASK          0X0f00
131 #define BITS_DATA_5             0X0500
132 #define BITS_DATA_6             0X0600
133 #define BITS_DATA_7             0X0700
134 #define BITS_DATA_8             0X0800
135 #define BITS_DATA_9             0X0900
136
137 #define BITS_PARITY_MASK        0x00f0
138 #define BITS_PARITY_NONE        0x0000
139 #define BITS_PARITY_ODD         0x0010
140 #define BITS_PARITY_EVEN        0x0020
141 #define BITS_PARITY_MARK        0x0030
142 #define BITS_PARITY_SPACE       0x0040
143
144 #define BITS_STOP_MASK          0x000f
145 #define BITS_STOP_1             0x0000
146 #define BITS_STOP_1_5           0x0001
147 #define BITS_STOP_2             0x0002
148
149 /* CP2101_BREAK */
150 #define BREAK_ON                0x0000
151 #define BREAK_OFF               0x0001
152
153 /* CP2101_CONTROL */
154 #define CONTROL_DTR             0x0001
155 #define CONTROL_RTS             0x0002
156 #define CONTROL_CTS             0x0010
157 #define CONTROL_DSR             0x0020
158 #define CONTROL_RING            0x0040
159 #define CONTROL_DCD             0x0080
160 #define CONTROL_WRITE_DTR       0x0100
161 #define CONTROL_WRITE_RTS       0x0200
162
163 /*
164  * cp2101_get_config
165  * Reads from the CP2101 configuration registers
166  * 'size' is specified in bytes.
167  * 'data' is a pointer to a pre-allocated array of integers large
168  * enough to hold 'size' bytes (with 4 bytes to each integer)
169  */
170 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
171                 unsigned int *data, int size)
172 {
173         struct usb_serial *serial = port->serial;
174         __le32 *buf;
175         int result, i, length;
176
177         /* Number of integers required to contain the array */
178         length = (((size - 1) | 3) + 1)/4;
179
180         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
181         if (!buf) {
182                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
183                 return -ENOMEM;
184         }
185
186         /* For get requests, the request number must be incremented */
187         request++;
188
189         /* Issue the request, attempting to read 'size' bytes */
190         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
191                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
192                                 0, buf, size, 300);
193
194         /* Convert data into an array of integers */
195         for (i=0; i<length; i++)
196                 data[i] = le32_to_cpu(buf[i]);
197
198         kfree(buf);
199
200         if (result != size) {
201                 dev_err(&port->dev, "%s - Unable to send config request, "
202                                 "request=0x%x size=%d result=%d\n",
203                                 __FUNCTION__, request, size, result);
204                 return -EPROTO;
205         }
206
207         return 0;
208 }
209
210 /*
211  * cp2101_set_config
212  * Writes to the CP2101 configuration registers
213  * Values less than 16 bits wide are sent directly
214  * 'size' is specified in bytes.
215  */
216 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
217                 unsigned int *data, int size)
218 {
219         struct usb_serial *serial = port->serial;
220         __le32 *buf;
221         int result, i, length;
222
223         /* Number of integers required to contain the array */
224         length = (((size - 1) | 3) + 1)/4;
225
226         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
227         if (!buf) {
228                 dev_err(&port->dev, "%s - out of memory.\n",
229                                 __FUNCTION__);
230                 return -ENOMEM;
231         }
232
233         /* Array of integers into bytes */
234         for (i = 0; i < length; i++)
235                 buf[i] = cpu_to_le32(data[i]);
236
237         if (size > 2) {
238                 result = usb_control_msg (serial->dev,
239                                 usb_sndctrlpipe(serial->dev, 0),
240                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
241                                 0, buf, size, 300);
242         } else {
243                 result = usb_control_msg (serial->dev,
244                                 usb_sndctrlpipe(serial->dev, 0),
245                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
246                                 0, NULL, 0, 300);
247         }
248
249         kfree(buf);
250
251         if ((size > 2 && result != size) || result < 0) {
252                 dev_err(&port->dev, "%s - Unable to send request, "
253                                 "request=0x%x size=%d result=%d\n",
254                                 __FUNCTION__, request, size, result);
255                 return -EPROTO;
256         }
257
258         /* Single data value */
259         result = usb_control_msg (serial->dev,
260                         usb_sndctrlpipe(serial->dev, 0),
261                         request, REQTYPE_HOST_TO_DEVICE, data[0],
262                         0, NULL, 0, 300);
263         return 0;
264 }
265
266 /*
267  * cp2101_set_config_single
268  * Convenience function for calling cp2101_set_config on single data values
269  * without requiring an integer pointer
270  */
271 static inline int cp2101_set_config_single(struct usb_serial_port* port,
272                 u8 request, unsigned int data)
273 {
274         return cp2101_set_config(port, request, &data, 2);
275 }
276
277 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
278 {
279         struct usb_serial *serial = port->serial;
280         int result;
281
282         dbg("%s - port %d", __FUNCTION__, port->number);
283
284         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
285                 dev_err(&port->dev, "%s - Unable to enable UART\n",
286                                 __FUNCTION__);
287                 return -EPROTO;
288         }
289
290         /* Start reading from the device */
291         usb_fill_bulk_urb (port->read_urb, serial->dev,
292                         usb_rcvbulkpipe(serial->dev,
293                         port->bulk_in_endpointAddress),
294                         port->read_urb->transfer_buffer,
295                         port->read_urb->transfer_buffer_length,
296                         serial->type->read_bulk_callback,
297                         port);
298         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
299         if (result) {
300                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
301                                 "error %d\n", __FUNCTION__, result);
302                 return result;
303         }
304
305         /* Configure the termios structure */
306         cp2101_get_termios(port);
307
308         /* Set the DTR and RTS pins low */
309         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
310
311         return 0;
312 }
313
314 static void cp2101_cleanup (struct usb_serial_port *port)
315 {
316         struct usb_serial *serial = port->serial;
317
318         dbg("%s - port %d", __FUNCTION__, port->number);
319
320         if (serial->dev) {
321                 /* shutdown any bulk reads that might be going on */
322                 if (serial->num_bulk_out)
323                         usb_kill_urb(port->write_urb);
324                 if (serial->num_bulk_in)
325                         usb_kill_urb(port->read_urb);
326         }
327 }
328
329 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
330 {
331         dbg("%s - port %d", __FUNCTION__, port->number);
332
333         /* shutdown our urbs */
334         dbg("%s - shutting down urbs", __FUNCTION__);
335         usb_kill_urb(port->write_urb);
336         usb_kill_urb(port->read_urb);
337
338         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
339 }
340
341 /*
342  * cp2101_get_termios
343  * Reads the baud rate, data bits, parity, stop bits and flow control mode
344  * from the device, corrects any unsupported values, and configures the
345  * termios structure to reflect the state of the device
346  */
347 static void cp2101_get_termios (struct usb_serial_port *port)
348 {
349         unsigned int cflag, modem_ctl[4];
350         int baud;
351         int bits;
352
353         dbg("%s - port %d", __FUNCTION__, port->number);
354
355         if ((!port->tty) || (!port->tty->termios)) {
356                 dbg("%s - no tty structures", __FUNCTION__);
357                 return;
358         }
359         cflag = port->tty->termios->c_cflag;
360
361         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
362         /* Convert to baudrate */
363         if (baud)
364                 baud = BAUD_RATE_GEN_FREQ / baud;
365
366         dbg("%s - baud rate = %d", __FUNCTION__, baud);
367         cflag &= ~CBAUD;
368         switch (baud) {
369                 /*
370                  * The baud rates which are commented out below
371                  * appear to be supported by the device
372                  * but are non-standard
373                  */
374                 case 600:       cflag |= B600;          break;
375                 case 1200:      cflag |= B1200;         break;
376                 case 1800:      cflag |= B1800;         break;
377                 case 2400:      cflag |= B2400;         break;
378                 case 4800:      cflag |= B4800;         break;
379                 /*case 7200:    cflag |= B7200;         break;*/
380                 case 9600:      cflag |= B9600;         break;
381                 /*case 14400:   cflag |= B14400;        break;*/
382                 case 19200:     cflag |= B19200;        break;
383                 /*case 28800:   cflag |= B28800;        break;*/
384                 case 38400:     cflag |= B38400;        break;
385                 /*case 55854:   cflag |= B55054;        break;*/
386                 case 57600:     cflag |= B57600;        break;
387                 case 115200:    cflag |= B115200;       break;
388                 /*case 127117:  cflag |= B127117;       break;*/
389                 case 230400:    cflag |= B230400;       break;
390                 case 460800:    cflag |= B460800;       break;
391                 case 921600:    cflag |= B921600;       break;
392                 /*case 3686400: cflag |= B3686400;      break;*/
393                 default:
394                         dbg("%s - Baud rate is not supported, "
395                                         "using 9600 baud", __FUNCTION__);
396                         cflag |= B9600;
397                         cp2101_set_config_single(port, CP2101_BAUDRATE,
398                                         (BAUD_RATE_GEN_FREQ/9600));
399                         break;
400         }
401
402         cp2101_get_config(port, CP2101_BITS, &bits, 2);
403         cflag &= ~CSIZE;
404         switch(bits & BITS_DATA_MASK) {
405                 case BITS_DATA_5:
406                         dbg("%s - data bits = 5", __FUNCTION__);
407                         cflag |= CS5;
408                         break;
409                 case BITS_DATA_6:
410                         dbg("%s - data bits = 6", __FUNCTION__);
411                         cflag |= CS6;
412                         break;
413                 case BITS_DATA_7:
414                         dbg("%s - data bits = 7", __FUNCTION__);
415                         cflag |= CS7;
416                         break;
417                 case BITS_DATA_8:
418                         dbg("%s - data bits = 8", __FUNCTION__);
419                         cflag |= CS8;
420                         break;
421                 case BITS_DATA_9:
422                         dbg("%s - data bits = 9 (not supported, "
423                                         "using 8 data bits)", __FUNCTION__);
424                         cflag |= CS8;
425                         bits &= ~BITS_DATA_MASK;
426                         bits |= BITS_DATA_8;
427                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
428                         break;
429                 default:
430                         dbg("%s - Unknown number of data bits, "
431                                         "using 8", __FUNCTION__);
432                         cflag |= CS8;
433                         bits &= ~BITS_DATA_MASK;
434                         bits |= BITS_DATA_8;
435                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
436                         break;
437         }
438
439         switch(bits & BITS_PARITY_MASK) {
440                 case BITS_PARITY_NONE:
441                         dbg("%s - parity = NONE", __FUNCTION__);
442                         cflag &= ~PARENB;
443                         break;
444                 case BITS_PARITY_ODD:
445                         dbg("%s - parity = ODD", __FUNCTION__);
446                         cflag |= (PARENB|PARODD);
447                         break;
448                 case BITS_PARITY_EVEN:
449                         dbg("%s - parity = EVEN", __FUNCTION__);
450                         cflag &= ~PARODD;
451                         cflag |= PARENB;
452                         break;
453                 case BITS_PARITY_MARK:
454                         dbg("%s - parity = MARK (not supported, "
455                                         "disabling parity)", __FUNCTION__);
456                         cflag &= ~PARENB;
457                         bits &= ~BITS_PARITY_MASK;
458                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
459                         break;
460                 case BITS_PARITY_SPACE:
461                         dbg("%s - parity = SPACE (not supported, "
462                                         "disabling parity)", __FUNCTION__);
463                         cflag &= ~PARENB;
464                         bits &= ~BITS_PARITY_MASK;
465                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
466                         break;
467                 default:
468                         dbg("%s - Unknown parity mode, "
469                                         "disabling parity", __FUNCTION__);
470                         cflag &= ~PARENB;
471                         bits &= ~BITS_PARITY_MASK;
472                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
473                         break;
474         }
475
476         cflag &= ~CSTOPB;
477         switch(bits & BITS_STOP_MASK) {
478                 case BITS_STOP_1:
479                         dbg("%s - stop bits = 1", __FUNCTION__);
480                         break;
481                 case BITS_STOP_1_5:
482                         dbg("%s - stop bits = 1.5 (not supported, "
483                                         "using 1 stop bit)", __FUNCTION__);
484                         bits &= ~BITS_STOP_MASK;
485                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
486                         break;
487                 case BITS_STOP_2:
488                         dbg("%s - stop bits = 2", __FUNCTION__);
489                         cflag |= CSTOPB;
490                         break;
491                 default:
492                         dbg("%s - Unknown number of stop bits, "
493                                         "using 1 stop bit", __FUNCTION__);
494                         bits &= ~BITS_STOP_MASK;
495                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
496                         break;
497         }
498
499         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
500         if (modem_ctl[0] & 0x0008) {
501                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
502                 cflag |= CRTSCTS;
503         } else {
504                 dbg("%s - flow control = NONE", __FUNCTION__);
505                 cflag &= ~CRTSCTS;
506         }
507
508         port->tty->termios->c_cflag = cflag;
509 }
510
511 static void cp2101_set_termios (struct usb_serial_port *port,
512                 struct ktermios *old_termios)
513 {
514         unsigned int cflag, old_cflag=0;
515         int baud=0, bits;
516         unsigned int modem_ctl[4];
517
518         dbg("%s - port %d", __FUNCTION__, port->number);
519
520         if ((!port->tty) || (!port->tty->termios)) {
521                 dbg("%s - no tty structures", __FUNCTION__);
522                 return;
523         }
524         cflag = port->tty->termios->c_cflag;
525
526         /* Check that they really want us to change something */
527         if (old_termios) {
528                 if ((cflag == old_termios->c_cflag) &&
529                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
530                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
531                         dbg("%s - nothing to change...", __FUNCTION__);
532                         return;
533                 }
534
535                 old_cflag = old_termios->c_cflag;
536         }
537
538         /* If the baud rate is to be updated*/
539         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
540                 switch (cflag & CBAUD) {
541                         /*
542                          * The baud rates which are commented out below
543                          * appear to be supported by the device
544                          * but are non-standard
545                          */
546                         case B0:        baud = 0;       break;
547                         case B600:      baud = 600;     break;
548                         case B1200:     baud = 1200;    break;
549                         case B1800:     baud = 1800;    break;
550                         case B2400:     baud = 2400;    break;
551                         case B4800:     baud = 4800;    break;
552                         /*case B7200:   baud = 7200;    break;*/
553                         case B9600:     baud = 9600;    break;
554                         /*ase B14400:   baud = 14400;   break;*/
555                         case B19200:    baud = 19200;   break;
556                         /*case B28800:  baud = 28800;   break;*/
557                         case B38400:    baud = 38400;   break;
558                         /*case B55854:  baud = 55054;   break;*/
559                         case B57600:    baud = 57600;   break;
560                         case B115200:   baud = 115200;  break;
561                         /*case B127117: baud = 127117;  break;*/
562                         case B230400:   baud = 230400;  break;
563                         case B460800:   baud = 460800;  break;
564                         case B921600:   baud = 921600;  break;
565                         /*case B3686400:        baud = 3686400; break;*/
566                         default:
567                                 dev_err(&port->dev, "cp2101 driver does not "
568                                         "support the baudrate requested\n");
569                                 break;
570                 }
571
572                 if (baud) {
573                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
574                                         baud);
575                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
576                                                 (BAUD_RATE_GEN_FREQ / baud)))
577                                 dev_err(&port->dev, "Baud rate requested not "
578                                                 "supported by device\n");
579                 }
580         }
581
582         /* If the number of data bits is to be updated */
583         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
584                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
585                 bits &= ~BITS_DATA_MASK;
586                 switch (cflag & CSIZE) {
587                         case CS5:
588                                 bits |= BITS_DATA_5;
589                                 dbg("%s - data bits = 5", __FUNCTION__);
590                                 break;
591                         case CS6:
592                                 bits |= BITS_DATA_6;
593                                 dbg("%s - data bits = 6", __FUNCTION__);
594                                 break;
595                         case CS7:
596                                 bits |= BITS_DATA_7;
597                                 dbg("%s - data bits = 7", __FUNCTION__);
598                                 break;
599                         case CS8:
600                                 bits |= BITS_DATA_8;
601                                 dbg("%s - data bits = 8", __FUNCTION__);
602                                 break;
603                         /*case CS9:
604                                 bits |= BITS_DATA_9;
605                                 dbg("%s - data bits = 9", __FUNCTION__);
606                                 break;*/
607                         default:
608                                 dev_err(&port->dev, "cp2101 driver does not "
609                                         "support the number of bits requested,"
610                                         " using 8 bit mode\n");
611                                 bits |= BITS_DATA_8;
612                                 break;
613                 }
614                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
615                         dev_err(&port->dev, "Number of data bits requested "
616                                         "not supported by device\n");
617         }
618
619         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
620                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
621                 bits &= ~BITS_PARITY_MASK;
622                 if (cflag & PARENB) {
623                         if (cflag & PARODD) {
624                                 bits |= BITS_PARITY_ODD;
625                                 dbg("%s - parity = ODD", __FUNCTION__);
626                         } else {
627                                 bits |= BITS_PARITY_EVEN;
628                                 dbg("%s - parity = EVEN", __FUNCTION__);
629                         }
630                 }
631                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
632                         dev_err(&port->dev, "Parity mode not supported "
633                                         "by device\n");
634         }
635
636         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
637                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
638                 bits &= ~BITS_STOP_MASK;
639                 if (cflag & CSTOPB) {
640                         bits |= BITS_STOP_2;
641                         dbg("%s - stop bits = 2", __FUNCTION__);
642                 } else {
643                         bits |= BITS_STOP_1;
644                         dbg("%s - stop bits = 1", __FUNCTION__);
645                 }
646                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
647                         dev_err(&port->dev, "Number of stop bits requested "
648                                         "not supported by device\n");
649         }
650
651         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
652                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
653                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
654                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
655                                 modem_ctl[2], modem_ctl[3]);
656
657                 if (cflag & CRTSCTS) {
658                         modem_ctl[0] &= ~0x7B;
659                         modem_ctl[0] |= 0x09;
660                         modem_ctl[1] = 0x80;
661                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
662                 } else {
663                         modem_ctl[0] &= ~0x7B;
664                         modem_ctl[0] |= 0x01;
665                         modem_ctl[1] |= 0x40;
666                         dbg("%s - flow control = NONE", __FUNCTION__);
667                 }
668
669                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
670                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
671                                 modem_ctl[2], modem_ctl[3]);
672                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
673         }
674
675 }
676
677 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
678                 unsigned int set, unsigned int clear)
679 {
680         int control = 0;
681
682         dbg("%s - port %d", __FUNCTION__, port->number);
683
684         if (set & TIOCM_RTS) {
685                 control |= CONTROL_RTS;
686                 control |= CONTROL_WRITE_RTS;
687         }
688         if (set & TIOCM_DTR) {
689                 control |= CONTROL_DTR;
690                 control |= CONTROL_WRITE_DTR;
691         }
692         if (clear & TIOCM_RTS) {
693                 control &= ~CONTROL_RTS;
694                 control |= CONTROL_WRITE_RTS;
695         }
696         if (clear & TIOCM_DTR) {
697                 control &= ~CONTROL_DTR;
698                 control |= CONTROL_WRITE_DTR;
699         }
700
701         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
702
703         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
704
705 }
706
707 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
708 {
709         int control, result;
710
711         dbg("%s - port %d", __FUNCTION__, port->number);
712
713         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
714
715         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
716                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
717                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
718                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
719                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
720                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
721
722         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
723
724         return result;
725 }
726
727 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
728 {
729         int state;
730
731         dbg("%s - port %d", __FUNCTION__, port->number);
732         if (break_state == 0)
733                 state = BREAK_OFF;
734         else
735                 state = BREAK_ON;
736         dbg("%s - turning break %s", __FUNCTION__,
737                         state==BREAK_OFF ? "off" : "on");
738         cp2101_set_config(port, CP2101_BREAK, &state, 2);
739 }
740
741 static int cp2101_startup (struct usb_serial *serial)
742 {
743         /* CP2101 buffers behave strangely unless device is reset */
744         usb_reset_device(serial->dev);
745         return 0;
746 }
747
748 static void cp2101_shutdown (struct usb_serial *serial)
749 {
750         int i;
751
752         dbg("%s", __FUNCTION__);
753
754         /* Stop reads and writes on all ports */
755         for (i=0; i < serial->num_ports; ++i) {
756                 cp2101_cleanup(serial->port[i]);
757         }
758 }
759
760 static int __init cp2101_init (void)
761 {
762         int retval;
763
764         retval = usb_serial_register(&cp2101_device);
765         if (retval)
766                 return retval; /* Failed to register */
767
768         retval = usb_register(&cp2101_driver);
769         if (retval) {
770                 /* Failed to register */
771                 usb_serial_deregister(&cp2101_device);
772                 return retval;
773         }
774
775         /* Success */
776         info(DRIVER_DESC " " DRIVER_VERSION);
777         return 0;
778 }
779
780 static void __exit cp2101_exit (void)
781 {
782         usb_deregister (&cp2101_driver);
783         usb_serial_deregister (&cp2101_device);
784 }
785
786 module_init(cp2101_init);
787 module_exit(cp2101_exit);
788
789 MODULE_DESCRIPTION(DRIVER_DESC);
790 MODULE_VERSION(DRIVER_VERSION);
791 MODULE_LICENSE("GPL");
792
793 module_param(debug, bool, S_IRUGO | S_IWUSR);
794 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");