[PATCH] USB: remove .owner field from struct usb_driver
[linux-2.6.git] / drivers / usb / serial / cp2101.c
1 /*
2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
3  *
4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License version
8  *      2 as published by the Free Software Foundation.
9  *
10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
12  * control thanks to Munir Nassar nassarmu@real-time.com
13  *
14  * Outstanding Issues:
15  *  Buffers are not flushed when the port is opened.
16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
17  *
18  */
19
20 #include <linux/config.h>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/slab.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/usb.h>
29 #include <asm/uaccess.h>
30 #include "usb-serial.h"
31
32 /*
33  * Version Information
34  */
35 #define DRIVER_VERSION "v0.05"
36 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
37
38 /*
39  * Function Prototypes
40  */
41 static int cp2101_open(struct usb_serial_port*, struct file*);
42 static void cp2101_cleanup(struct usb_serial_port*);
43 static void cp2101_close(struct usb_serial_port*, struct file*);
44 static void cp2101_get_termios(struct usb_serial_port*);
45 static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
46 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
47 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
48                 unsigned int, unsigned int);
49 static void cp2101_break_ctl(struct usb_serial_port*, int);
50 static int cp2101_startup (struct usb_serial *);
51 static void cp2101_shutdown(struct usb_serial*);
52
53
54 static int debug;
55
56 static struct usb_device_id id_table [] = {
57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
58         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
59         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
60         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
63         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
64         { } /* Terminating Entry */
65 };
66
67 MODULE_DEVICE_TABLE (usb, id_table);
68
69 static struct usb_driver cp2101_driver = {
70         .name           = "cp2101",
71         .probe          = usb_serial_probe,
72         .disconnect     = usb_serial_disconnect,
73         .id_table       = id_table,
74         .no_dynamic_id  =       1,
75 };
76
77 static struct usb_serial_driver cp2101_device = {
78         .driver = {
79                 .owner =        THIS_MODULE,
80                 .name =         "cp2101",
81         },
82         .id_table               = id_table,
83         .num_interrupt_in       = 0,
84         .num_bulk_in            = 0,
85         .num_bulk_out           = 0,
86         .num_ports              = 1,
87         .open                   = cp2101_open,
88         .close                  = cp2101_close,
89         .break_ctl              = cp2101_break_ctl,
90         .set_termios            = cp2101_set_termios,
91         .tiocmget               = cp2101_tiocmget,
92         .tiocmset               = cp2101_tiocmset,
93         .attach                 = cp2101_startup,
94         .shutdown               = cp2101_shutdown,
95 };
96
97 /* Config request types */
98 #define REQTYPE_HOST_TO_DEVICE  0x41
99 #define REQTYPE_DEVICE_TO_HOST  0xc1
100
101 /* Config SET requests. To GET, add 1 to the request number */
102 #define CP2101_UART             0x00    /* Enable / Disable */
103 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
104 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
105 #define CP2101_BREAK            0x05    /* On / Off */
106 #define CP2101_CONTROL          0x07    /* Flow control line states */
107 #define CP2101_MODEMCTL         0x13    /* Modem controls */
108 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
109
110 /* CP2101_UART */
111 #define UART_ENABLE             0x0001
112 #define UART_DISABLE            0x0000
113
114 /* CP2101_BAUDRATE */
115 #define BAUD_RATE_GEN_FREQ      0x384000
116
117 /* CP2101_BITS */
118 #define BITS_DATA_MASK          0X0f00
119 #define BITS_DATA_5             0X0500
120 #define BITS_DATA_6             0X0600
121 #define BITS_DATA_7             0X0700
122 #define BITS_DATA_8             0X0800
123 #define BITS_DATA_9             0X0900
124
125 #define BITS_PARITY_MASK        0x00f0
126 #define BITS_PARITY_NONE        0x0000
127 #define BITS_PARITY_ODD         0x0010
128 #define BITS_PARITY_EVEN        0x0020
129 #define BITS_PARITY_MARK        0x0030
130 #define BITS_PARITY_SPACE       0x0040
131
132 #define BITS_STOP_MASK          0x000f
133 #define BITS_STOP_1             0x0000
134 #define BITS_STOP_1_5           0x0001
135 #define BITS_STOP_2             0x0002
136
137 /* CP2101_BREAK */
138 #define BREAK_ON                0x0000
139 #define BREAK_OFF               0x0001
140
141 /* CP2101_CONTROL */
142 #define CONTROL_DTR             0x0001
143 #define CONTROL_RTS             0x0002
144 #define CONTROL_CTS             0x0010
145 #define CONTROL_DSR             0x0020
146 #define CONTROL_RING            0x0040
147 #define CONTROL_DCD             0x0080
148 #define CONTROL_WRITE_DTR       0x0100
149 #define CONTROL_WRITE_RTS       0x0200
150
151 /*
152  * cp2101_get_config
153  * Reads from the CP2101 configuration registers
154  * 'size' is specified in bytes.
155  * 'data' is a pointer to a pre-allocated array of integers large
156  * enough to hold 'size' bytes (with 4 bytes to each integer)
157  */
158 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
159                 unsigned int *data, int size)
160 {
161         struct usb_serial *serial = port->serial;
162         u32 *buf;
163         int result, i, length;
164
165         /* Number of integers required to contain the array */
166         length = (((size - 1) | 3) + 1)/4;
167
168         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
169         memset(buf, 0, length * sizeof(u32));
170
171         if (!buf) {
172                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
173                 return -ENOMEM;
174         }
175
176         /* For get requests, the request number must be incremented */
177         request++;
178
179         /* Issue the request, attempting to read 'size' bytes */
180         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
181                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
182                                 0, buf, size, 300);
183
184         /* Convert data into an array of integers */
185         for (i=0; i<length; i++)
186                 data[i] = le32_to_cpu(buf[i]);
187
188         kfree(buf);
189
190         if (result != size) {
191                 dev_err(&port->dev, "%s - Unable to send config request, "
192                                 "request=0x%x size=%d result=%d\n",
193                                 __FUNCTION__, request, size, result);
194                 return -EPROTO;
195         }
196
197         return 0;
198 }
199
200 /*
201  * cp2101_set_config
202  * Writes to the CP2101 configuration registers
203  * Values less than 16 bits wide are sent directly
204  * 'size' is specified in bytes.
205  */
206 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
207                 unsigned int *data, int size)
208 {
209         struct usb_serial *serial = port->serial;
210         u32 *buf;
211         int result, i, length;
212
213         /* Number of integers required to contain the array */
214         length = (((size - 1) | 3) + 1)/4;
215
216         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
217         if (!buf) {
218                 dev_err(&port->dev, "%s - out of memory.\n",
219                                 __FUNCTION__);
220                 return -ENOMEM;
221         }
222
223         /* Array of integers into bytes */
224         for (i = 0; i < length; i++)
225                 buf[i] = cpu_to_le32(data[i]);
226
227         if (size > 2) {
228                 result = usb_control_msg (serial->dev,
229                                 usb_sndctrlpipe(serial->dev, 0),
230                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
231                                 0, buf, size, 300);
232         } else {
233                 result = usb_control_msg (serial->dev,
234                                 usb_sndctrlpipe(serial->dev, 0),
235                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
236                                 0, NULL, 0, 300);
237         }
238
239         kfree(buf);
240
241         if ((size > 2 && result != size) || result < 0) {
242                 dev_err(&port->dev, "%s - Unable to send request, "
243                                 "request=0x%x size=%d result=%d\n",
244                                 __FUNCTION__, request, size, result);
245                 return -EPROTO;
246         }
247
248         /* Single data value */
249         result = usb_control_msg (serial->dev,
250                         usb_sndctrlpipe(serial->dev, 0),
251                         request, REQTYPE_HOST_TO_DEVICE, data[0],
252                         0, NULL, 0, 300);
253         return 0;
254 }
255
256 /*
257  * cp2101_set_config_single
258  * Convenience function for calling cp2101_set_config on single data values
259  * without requiring an integer pointer
260  */
261 static inline int cp2101_set_config_single(struct usb_serial_port* port,
262                 u8 request, unsigned int data)
263 {
264         return cp2101_set_config(port, request, &data, 2);
265 }
266
267 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
268 {
269         struct usb_serial *serial = port->serial;
270         int result;
271
272         dbg("%s - port %d", __FUNCTION__, port->number);
273
274         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
275                 dev_err(&port->dev, "%s - Unable to enable UART\n",
276                                 __FUNCTION__);
277                 return -EPROTO;
278         }
279
280         /* Start reading from the device */
281         usb_fill_bulk_urb (port->read_urb, serial->dev,
282                         usb_rcvbulkpipe(serial->dev,
283                         port->bulk_in_endpointAddress),
284                         port->read_urb->transfer_buffer,
285                         port->read_urb->transfer_buffer_length,
286                         serial->type->read_bulk_callback,
287                         port);
288         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
289         if (result) {
290                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
291                                 "error %d\n", __FUNCTION__, result);
292                 return result;
293         }
294
295         /* Configure the termios structure */
296         cp2101_get_termios(port);
297
298         /* Set the DTR and RTS pins low */
299         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
300
301         return 0;
302 }
303
304 static void cp2101_cleanup (struct usb_serial_port *port)
305 {
306         struct usb_serial *serial = port->serial;
307
308         dbg("%s - port %d", __FUNCTION__, port->number);
309
310         if (serial->dev) {
311                 /* shutdown any bulk reads that might be going on */
312                 if (serial->num_bulk_out)
313                         usb_kill_urb(port->write_urb);
314                 if (serial->num_bulk_in)
315                         usb_kill_urb(port->read_urb);
316         }
317 }
318
319 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
320 {
321         dbg("%s - port %d", __FUNCTION__, port->number);
322
323         /* shutdown our urbs */
324         dbg("%s - shutting down urbs", __FUNCTION__);
325         usb_kill_urb(port->write_urb);
326         usb_kill_urb(port->read_urb);
327
328         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
329 }
330
331 /*
332  * cp2101_get_termios
333  * Reads the baud rate, data bits, parity, stop bits and flow control mode
334  * from the device, corrects any unsupported values, and configures the
335  * termios structure to reflect the state of the device
336  */
337 static void cp2101_get_termios (struct usb_serial_port *port)
338 {
339         unsigned int cflag, modem_ctl[4];
340         int baud;
341         int bits;
342
343         dbg("%s - port %d", __FUNCTION__, port->number);
344
345         if ((!port->tty) || (!port->tty->termios)) {
346                 dbg("%s - no tty structures", __FUNCTION__);
347                 return;
348         }
349         cflag = port->tty->termios->c_cflag;
350
351         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
352         /* Convert to baudrate */
353         if (baud)
354                 baud = BAUD_RATE_GEN_FREQ / baud;
355
356         dbg("%s - baud rate = %d", __FUNCTION__, baud);
357         cflag &= ~CBAUD;
358         switch (baud) {
359                 /*
360                  * The baud rates which are commented out below
361                  * appear to be supported by the device
362                  * but are non-standard
363                  */
364                 case 600:       cflag |= B600;          break;
365                 case 1200:      cflag |= B1200;         break;
366                 case 1800:      cflag |= B1800;         break;
367                 case 2400:      cflag |= B2400;         break;
368                 case 4800:      cflag |= B4800;         break;
369                 /*case 7200:    cflag |= B7200;         break;*/
370                 case 9600:      cflag |= B9600;         break;
371                 /*case 14400:   cflag |= B14400;        break;*/
372                 case 19200:     cflag |= B19200;        break;
373                 /*case 28800:   cflag |= B28800;        break;*/
374                 case 38400:     cflag |= B38400;        break;
375                 /*case 55854:   cflag |= B55054;        break;*/
376                 case 57600:     cflag |= B57600;        break;
377                 case 115200:    cflag |= B115200;       break;
378                 /*case 127117:  cflag |= B127117;       break;*/
379                 case 230400:    cflag |= B230400;       break;
380                 case 460800:    cflag |= B460800;       break;
381                 case 921600:    cflag |= B921600;       break;
382                 /*case 3686400: cflag |= B3686400;      break;*/
383                 default:
384                         dbg("%s - Baud rate is not supported, "
385                                         "using 9600 baud", __FUNCTION__);
386                         cflag |= B9600;
387                         cp2101_set_config_single(port, CP2101_BAUDRATE,
388                                         (BAUD_RATE_GEN_FREQ/9600));
389                         break;
390         }
391
392         cp2101_get_config(port, CP2101_BITS, &bits, 2);
393         cflag &= ~CSIZE;
394         switch(bits & BITS_DATA_MASK) {
395                 case BITS_DATA_5:
396                         dbg("%s - data bits = 5", __FUNCTION__);
397                         cflag |= CS5;
398                         break;
399                 case BITS_DATA_6:
400                         dbg("%s - data bits = 6", __FUNCTION__);
401                         cflag |= CS6;
402                         break;
403                 case BITS_DATA_7:
404                         dbg("%s - data bits = 7", __FUNCTION__);
405                         cflag |= CS7;
406                         break;
407                 case BITS_DATA_8:
408                         dbg("%s - data bits = 8", __FUNCTION__);
409                         cflag |= CS8;
410                         break;
411                 case BITS_DATA_9:
412                         dbg("%s - data bits = 9 (not supported, "
413                                         "using 8 data bits)", __FUNCTION__);
414                         cflag |= CS8;
415                         bits &= ~BITS_DATA_MASK;
416                         bits |= BITS_DATA_8;
417                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
418                         break;
419                 default:
420                         dbg("%s - Unknown number of data bits, "
421                                         "using 8", __FUNCTION__);
422                         cflag |= CS8;
423                         bits &= ~BITS_DATA_MASK;
424                         bits |= BITS_DATA_8;
425                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
426                         break;
427         }
428
429         switch(bits & BITS_PARITY_MASK) {
430                 case BITS_PARITY_NONE:
431                         dbg("%s - parity = NONE", __FUNCTION__);
432                         cflag &= ~PARENB;
433                         break;
434                 case BITS_PARITY_ODD:
435                         dbg("%s - parity = ODD", __FUNCTION__);
436                         cflag |= (PARENB|PARODD);
437                         break;
438                 case BITS_PARITY_EVEN:
439                         dbg("%s - parity = EVEN", __FUNCTION__);
440                         cflag &= ~PARODD;
441                         cflag |= PARENB;
442                         break;
443                 case BITS_PARITY_MARK:
444                         dbg("%s - parity = MARK (not supported, "
445                                         "disabling parity)", __FUNCTION__);
446                         cflag &= ~PARENB;
447                         bits &= ~BITS_PARITY_MASK;
448                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
449                         break;
450                 case BITS_PARITY_SPACE:
451                         dbg("%s - parity = SPACE (not supported, "
452                                         "disabling parity)", __FUNCTION__);
453                         cflag &= ~PARENB;
454                         bits &= ~BITS_PARITY_MASK;
455                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
456                         break;
457                 default:
458                         dbg("%s - Unknown parity mode, "
459                                         "disabling parity", __FUNCTION__);
460                         cflag &= ~PARENB;
461                         bits &= ~BITS_PARITY_MASK;
462                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
463                         break;
464         }
465
466         cflag &= ~CSTOPB;
467         switch(bits & BITS_STOP_MASK) {
468                 case BITS_STOP_1:
469                         dbg("%s - stop bits = 1", __FUNCTION__);
470                         break;
471                 case BITS_STOP_1_5:
472                         dbg("%s - stop bits = 1.5 (not supported, "
473                                         "using 1 stop bit)", __FUNCTION__);
474                         bits &= ~BITS_STOP_MASK;
475                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
476                         break;
477                 case BITS_STOP_2:
478                         dbg("%s - stop bits = 2", __FUNCTION__);
479                         cflag |= CSTOPB;
480                         break;
481                 default:
482                         dbg("%s - Unknown number of stop bits, "
483                                         "using 1 stop bit", __FUNCTION__);
484                         bits &= ~BITS_STOP_MASK;
485                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
486                         break;
487         }
488
489         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
490         if (modem_ctl[0] & 0x0008) {
491                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
492                 cflag |= CRTSCTS;
493         } else {
494                 dbg("%s - flow control = NONE", __FUNCTION__);
495                 cflag &= ~CRTSCTS;
496         }
497
498         port->tty->termios->c_cflag = cflag;
499 }
500
501 static void cp2101_set_termios (struct usb_serial_port *port,
502                 struct termios *old_termios)
503 {
504         unsigned int cflag, old_cflag=0;
505         int baud=0, bits;
506         unsigned int modem_ctl[4];
507
508         dbg("%s - port %d", __FUNCTION__, port->number);
509
510         if ((!port->tty) || (!port->tty->termios)) {
511                 dbg("%s - no tty structures", __FUNCTION__);
512                 return;
513         }
514         cflag = port->tty->termios->c_cflag;
515
516         /* Check that they really want us to change something */
517         if (old_termios) {
518                 if ((cflag == old_termios->c_cflag) &&
519                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
520                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
521                         dbg("%s - nothing to change...", __FUNCTION__);
522                         return;
523                 }
524
525                 old_cflag = old_termios->c_cflag;
526         }
527
528         /* If the baud rate is to be updated*/
529         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
530                 switch (cflag & CBAUD) {
531                         /*
532                          * The baud rates which are commented out below
533                          * appear to be supported by the device
534                          * but are non-standard
535                          */
536                         case B0:        baud = 0;       break;
537                         case B600:      baud = 600;     break;
538                         case B1200:     baud = 1200;    break;
539                         case B1800:     baud = 1800;    break;
540                         case B2400:     baud = 2400;    break;
541                         case B4800:     baud = 4800;    break;
542                         /*case B7200:   baud = 7200;    break;*/
543                         case B9600:     baud = 9600;    break;
544                         /*ase B14400:   baud = 14400;   break;*/
545                         case B19200:    baud = 19200;   break;
546                         /*case B28800:  baud = 28800;   break;*/
547                         case B38400:    baud = 38400;   break;
548                         /*case B55854:  baud = 55054;   break;*/
549                         case B57600:    baud = 57600;   break;
550                         case B115200:   baud = 115200;  break;
551                         /*case B127117: baud = 127117;  break;*/
552                         case B230400:   baud = 230400;  break;
553                         case B460800:   baud = 460800;  break;
554                         case B921600:   baud = 921600;  break;
555                         /*case B3686400:        baud = 3686400; break;*/
556                         default:
557                                 dev_err(&port->dev, "cp2101 driver does not "
558                                         "support the baudrate requested\n");
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");