]> www.pilppa.org Git - linux-2.6-omap-h63xx.git/blob - drivers/usb/serial/cp2101.c
Merge branch 'linus' into x86/memory-corruption-check
[linux-2.6-omap-h63xx.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/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 <linux/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 tty_struct *, struct usb_serial_port *,
41                                                         struct file *);
42 static void cp2101_cleanup(struct usb_serial_port *);
43 static void cp2101_close(struct tty_struct *, struct usb_serial_port *,
44                                                         struct file*);
45 static void cp2101_get_termios(struct tty_struct *);
46 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
47                                                         struct ktermios*);
48 static int cp2101_tiocmget(struct tty_struct *, struct file *);
49 static int cp2101_tiocmset(struct tty_struct *, struct file *,
50                 unsigned int, unsigned int);
51 static void cp2101_break_ctl(struct tty_struct *, int);
52 static int cp2101_startup(struct usb_serial *);
53 static void cp2101_shutdown(struct usb_serial *);
54
55
56 static int debug;
57
58 static struct usb_device_id id_table [] = {
59         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
60         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
61         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
62         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
63         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
64         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
65         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
66         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
67         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
68         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
69         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
70         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
71         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
72         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
73         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
74         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
75         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
76         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
77         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
78         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
79         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
80         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
81         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
82         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
83         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
84         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
85         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
86         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
87         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
88         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
89         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
90         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
91         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
92         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
93         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
94         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
95         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
96         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
97         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
98         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
99         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
100         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
101         { } /* Terminating Entry */
102 };
103
104 MODULE_DEVICE_TABLE(usb, id_table);
105
106 static struct usb_driver cp2101_driver = {
107         .name           = "cp2101",
108         .probe          = usb_serial_probe,
109         .disconnect     = usb_serial_disconnect,
110         .id_table       = id_table,
111         .no_dynamic_id  =       1,
112 };
113
114 static struct usb_serial_driver cp2101_device = {
115         .driver = {
116                 .owner =        THIS_MODULE,
117                 .name =         "cp2101",
118         },
119         .usb_driver             = &cp2101_driver,
120         .id_table               = id_table,
121         .num_ports              = 1,
122         .open                   = cp2101_open,
123         .close                  = cp2101_close,
124         .break_ctl              = cp2101_break_ctl,
125         .set_termios            = cp2101_set_termios,
126         .tiocmget               = cp2101_tiocmget,
127         .tiocmset               = cp2101_tiocmset,
128         .attach                 = cp2101_startup,
129         .shutdown               = cp2101_shutdown,
130 };
131
132 /* Config request types */
133 #define REQTYPE_HOST_TO_DEVICE  0x41
134 #define REQTYPE_DEVICE_TO_HOST  0xc1
135
136 /* Config SET requests. To GET, add 1 to the request number */
137 #define CP2101_UART             0x00    /* Enable / Disable */
138 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
139 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
140 #define CP2101_BREAK            0x05    /* On / Off */
141 #define CP2101_CONTROL          0x07    /* Flow control line states */
142 #define CP2101_MODEMCTL         0x13    /* Modem controls */
143 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
144
145 /* CP2101_UART */
146 #define UART_ENABLE             0x0001
147 #define UART_DISABLE            0x0000
148
149 /* CP2101_BAUDRATE */
150 #define BAUD_RATE_GEN_FREQ      0x384000
151
152 /* CP2101_BITS */
153 #define BITS_DATA_MASK          0X0f00
154 #define BITS_DATA_5             0X0500
155 #define BITS_DATA_6             0X0600
156 #define BITS_DATA_7             0X0700
157 #define BITS_DATA_8             0X0800
158 #define BITS_DATA_9             0X0900
159
160 #define BITS_PARITY_MASK        0x00f0
161 #define BITS_PARITY_NONE        0x0000
162 #define BITS_PARITY_ODD         0x0010
163 #define BITS_PARITY_EVEN        0x0020
164 #define BITS_PARITY_MARK        0x0030
165 #define BITS_PARITY_SPACE       0x0040
166
167 #define BITS_STOP_MASK          0x000f
168 #define BITS_STOP_1             0x0000
169 #define BITS_STOP_1_5           0x0001
170 #define BITS_STOP_2             0x0002
171
172 /* CP2101_BREAK */
173 #define BREAK_ON                0x0000
174 #define BREAK_OFF               0x0001
175
176 /* CP2101_CONTROL */
177 #define CONTROL_DTR             0x0001
178 #define CONTROL_RTS             0x0002
179 #define CONTROL_CTS             0x0010
180 #define CONTROL_DSR             0x0020
181 #define CONTROL_RING            0x0040
182 #define CONTROL_DCD             0x0080
183 #define CONTROL_WRITE_DTR       0x0100
184 #define CONTROL_WRITE_RTS       0x0200
185
186 /*
187  * cp2101_get_config
188  * Reads from the CP2101 configuration registers
189  * 'size' is specified in bytes.
190  * 'data' is a pointer to a pre-allocated array of integers large
191  * enough to hold 'size' bytes (with 4 bytes to each integer)
192  */
193 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
194                 unsigned int *data, int size)
195 {
196         struct usb_serial *serial = port->serial;
197         __le32 *buf;
198         int result, i, length;
199
200         /* Number of integers required to contain the array */
201         length = (((size - 1) | 3) + 1)/4;
202
203         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
204         if (!buf) {
205                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
206                 return -ENOMEM;
207         }
208
209         /* For get requests, the request number must be incremented */
210         request++;
211
212         /* Issue the request, attempting to read 'size' bytes */
213         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
214                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
215                                 0, buf, size, 300);
216
217         /* Convert data into an array of integers */
218         for (i = 0; i < length; i++)
219                 data[i] = le32_to_cpu(buf[i]);
220
221         kfree(buf);
222
223         if (result != size) {
224                 dev_err(&port->dev, "%s - Unable to send config request, "
225                                 "request=0x%x size=%d result=%d\n",
226                                 __func__, request, size, result);
227                 return -EPROTO;
228         }
229
230         return 0;
231 }
232
233 /*
234  * cp2101_set_config
235  * Writes to the CP2101 configuration registers
236  * Values less than 16 bits wide are sent directly
237  * 'size' is specified in bytes.
238  */
239 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
240                 unsigned int *data, int size)
241 {
242         struct usb_serial *serial = port->serial;
243         __le32 *buf;
244         int result, i, length;
245
246         /* Number of integers required to contain the array */
247         length = (((size - 1) | 3) + 1)/4;
248
249         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
250         if (!buf) {
251                 dev_err(&port->dev, "%s - out of memory.\n",
252                                 __func__);
253                 return -ENOMEM;
254         }
255
256         /* Array of integers into bytes */
257         for (i = 0; i < length; i++)
258                 buf[i] = cpu_to_le32(data[i]);
259
260         if (size > 2) {
261                 result = usb_control_msg(serial->dev,
262                                 usb_sndctrlpipe(serial->dev, 0),
263                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
264                                 0, buf, size, 300);
265         } else {
266                 result = usb_control_msg(serial->dev,
267                                 usb_sndctrlpipe(serial->dev, 0),
268                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
269                                 0, NULL, 0, 300);
270         }
271
272         kfree(buf);
273
274         if ((size > 2 && result != size) || result < 0) {
275                 dev_err(&port->dev, "%s - Unable to send request, "
276                                 "request=0x%x size=%d result=%d\n",
277                                 __func__, request, size, result);
278                 return -EPROTO;
279         }
280
281         /* Single data value */
282         result = usb_control_msg(serial->dev,
283                         usb_sndctrlpipe(serial->dev, 0),
284                         request, REQTYPE_HOST_TO_DEVICE, data[0],
285                         0, NULL, 0, 300);
286         return 0;
287 }
288
289 /*
290  * cp2101_set_config_single
291  * Convenience function for calling cp2101_set_config on single data values
292  * without requiring an integer pointer
293  */
294 static inline int cp2101_set_config_single(struct usb_serial_port *port,
295                 u8 request, unsigned int data)
296 {
297         return cp2101_set_config(port, request, &data, 2);
298 }
299
300 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
301                                 struct file *filp)
302 {
303         struct usb_serial *serial = port->serial;
304         int result;
305
306         dbg("%s - port %d", __func__, port->number);
307
308         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
309                 dev_err(&port->dev, "%s - Unable to enable UART\n",
310                                 __func__);
311                 return -EPROTO;
312         }
313
314         /* Start reading from the device */
315         usb_fill_bulk_urb(port->read_urb, serial->dev,
316                         usb_rcvbulkpipe(serial->dev,
317                         port->bulk_in_endpointAddress),
318                         port->read_urb->transfer_buffer,
319                         port->read_urb->transfer_buffer_length,
320                         serial->type->read_bulk_callback,
321                         port);
322         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
323         if (result) {
324                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
325                                 "error %d\n", __func__, result);
326                 return result;
327         }
328
329         /* Configure the termios structure */
330         cp2101_get_termios(tty);
331
332         /* Set the DTR and RTS pins low */
333         cp2101_tiocmset(tty, NULL, TIOCM_DTR | TIOCM_RTS, 0);
334
335         return 0;
336 }
337
338 static void cp2101_cleanup(struct usb_serial_port *port)
339 {
340         struct usb_serial *serial = port->serial;
341
342         dbg("%s - port %d", __func__, port->number);
343
344         if (serial->dev) {
345                 /* shutdown any bulk reads that might be going on */
346                 if (serial->num_bulk_out)
347                         usb_kill_urb(port->write_urb);
348                 if (serial->num_bulk_in)
349                         usb_kill_urb(port->read_urb);
350         }
351 }
352
353 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
354                                         struct file *filp)
355 {
356         dbg("%s - port %d", __func__, port->number);
357
358         /* shutdown our urbs */
359         dbg("%s - shutting down urbs", __func__);
360         usb_kill_urb(port->write_urb);
361         usb_kill_urb(port->read_urb);
362
363         mutex_lock(&port->serial->disc_mutex);
364         if (!port->serial->disconnected)
365                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
366         mutex_unlock(&port->serial->disc_mutex);
367 }
368
369 /*
370  * cp2101_get_termios
371  * Reads the baud rate, data bits, parity, stop bits and flow control mode
372  * from the device, corrects any unsupported values, and configures the
373  * termios structure to reflect the state of the device
374  */
375 static void cp2101_get_termios (struct tty_struct *tty)
376 {
377         struct usb_serial_port *port = tty->driver_data;
378         unsigned int cflag, modem_ctl[4];
379         unsigned int baud;
380         unsigned int bits;
381
382         dbg("%s - port %d", __func__, port->number);
383
384         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
385         /* Convert to baudrate */
386         if (baud)
387                 baud = BAUD_RATE_GEN_FREQ / baud;
388
389         dbg("%s - baud rate = %d", __func__, baud);
390
391         tty_encode_baud_rate(tty, baud, baud);
392         cflag = tty->termios->c_cflag;
393
394         cp2101_get_config(port, CP2101_BITS, &bits, 2);
395         cflag &= ~CSIZE;
396         switch (bits & BITS_DATA_MASK) {
397         case BITS_DATA_5:
398                 dbg("%s - data bits = 5", __func__);
399                 cflag |= CS5;
400                 break;
401         case BITS_DATA_6:
402                 dbg("%s - data bits = 6", __func__);
403                 cflag |= CS6;
404                 break;
405         case BITS_DATA_7:
406                 dbg("%s - data bits = 7", __func__);
407                 cflag |= CS7;
408                 break;
409         case BITS_DATA_8:
410                 dbg("%s - data bits = 8", __func__);
411                 cflag |= CS8;
412                 break;
413         case BITS_DATA_9:
414                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
415                                                                 __func__);
416                 cflag |= CS8;
417                 bits &= ~BITS_DATA_MASK;
418                 bits |= BITS_DATA_8;
419                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
420                 break;
421         default:
422                 dbg("%s - Unknown number of data bits, using 8", __func__);
423                 cflag |= CS8;
424                 bits &= ~BITS_DATA_MASK;
425                 bits |= BITS_DATA_8;
426                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
427                 break;
428         }
429
430         switch (bits & BITS_PARITY_MASK) {
431         case BITS_PARITY_NONE:
432                 dbg("%s - parity = NONE", __func__);
433                 cflag &= ~PARENB;
434                 break;
435         case BITS_PARITY_ODD:
436                 dbg("%s - parity = ODD", __func__);
437                 cflag |= (PARENB|PARODD);
438                 break;
439         case BITS_PARITY_EVEN:
440                 dbg("%s - parity = EVEN", __func__);
441                 cflag &= ~PARODD;
442                 cflag |= PARENB;
443                 break;
444         case BITS_PARITY_MARK:
445                 dbg("%s - parity = MARK (not supported, disabling parity)",
446                                 __func__);
447                 cflag &= ~PARENB;
448                 bits &= ~BITS_PARITY_MASK;
449                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
450                 break;
451         case BITS_PARITY_SPACE:
452                 dbg("%s - parity = SPACE (not supported, disabling parity)",
453                                 __func__);
454                 cflag &= ~PARENB;
455                 bits &= ~BITS_PARITY_MASK;
456                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
457                 break;
458         default:
459                 dbg("%s - Unknown parity mode, disabling parity", __func__);
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", __func__);
470                 break;
471         case BITS_STOP_1_5:
472                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
473                                                                 __func__);
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", __func__);
479                 cflag |= CSTOPB;
480                 break;
481         default:
482                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
483                                                                 __func__);
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", __func__);
492                 cflag |= CRTSCTS;
493         } else {
494                 dbg("%s - flow control = NONE", __func__);
495                 cflag &= ~CRTSCTS;
496         }
497
498         tty->termios->c_cflag = cflag;
499 }
500
501 static void cp2101_set_termios(struct tty_struct *tty,
502                 struct usb_serial_port *port, struct ktermios *old_termios)
503 {
504         unsigned int cflag, old_cflag;
505         unsigned int baud = 0, bits;
506         unsigned int modem_ctl[4];
507
508         dbg("%s - port %d", __func__, port->number);
509
510         if (!tty)
511                 return;
512
513         tty->termios->c_cflag &= ~CMSPAR;
514         cflag = tty->termios->c_cflag;
515         old_cflag = old_termios->c_cflag;
516         baud = tty_get_baud_rate(tty);
517
518         /* If the baud rate is to be updated*/
519         if (baud != tty_termios_baud_rate(old_termios)) {
520                 switch (baud) {
521                 case 0:
522                 case 600:
523                 case 1200:
524                 case 1800:
525                 case 2400:
526                 case 4800:
527                 case 7200:
528                 case 9600:
529                 case 14400:
530                 case 19200:
531                 case 28800:
532                 case 38400:
533                 case 55854:
534                 case 57600:
535                 case 115200:
536                 case 127117:
537                 case 230400:
538                 case 460800:
539                 case 921600:
540                 case 3686400:
541                         break;
542                 default:
543                         baud = 9600;
544                         break;
545                 }
546
547                 if (baud) {
548                         dbg("%s - Setting baud rate to %d baud", __func__,
549                                         baud);
550                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
551                                                 (BAUD_RATE_GEN_FREQ / baud))) {
552                                 dev_err(&port->dev, "Baud rate requested not "
553                                                 "supported by device\n");
554                                 baud = tty_termios_baud_rate(old_termios);
555                         }
556                 }
557         }
558         /* Report back the resulting baud rate */
559         tty_encode_baud_rate(tty, baud, baud);
560
561         /* If the number of data bits is to be updated */
562         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
563                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
564                 bits &= ~BITS_DATA_MASK;
565                 switch (cflag & CSIZE) {
566                 case CS5:
567                         bits |= BITS_DATA_5;
568                         dbg("%s - data bits = 5", __func__);
569                         break;
570                 case CS6:
571                         bits |= BITS_DATA_6;
572                         dbg("%s - data bits = 6", __func__);
573                         break;
574                 case CS7:
575                         bits |= BITS_DATA_7;
576                         dbg("%s - data bits = 7", __func__);
577                         break;
578                 case CS8:
579                         bits |= BITS_DATA_8;
580                         dbg("%s - data bits = 8", __func__);
581                         break;
582                 /*case CS9:
583                         bits |= BITS_DATA_9;
584                         dbg("%s - data bits = 9", __func__);
585                         break;*/
586                 default:
587                         dev_err(&port->dev, "cp2101 driver does not "
588                                         "support the number of bits requested,"
589                                         " using 8 bit mode\n");
590                                 bits |= BITS_DATA_8;
591                                 break;
592                 }
593                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
594                         dev_err(&port->dev, "Number of data bits requested "
595                                         "not supported by device\n");
596         }
597
598         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
599                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
600                 bits &= ~BITS_PARITY_MASK;
601                 if (cflag & PARENB) {
602                         if (cflag & PARODD) {
603                                 bits |= BITS_PARITY_ODD;
604                                 dbg("%s - parity = ODD", __func__);
605                         } else {
606                                 bits |= BITS_PARITY_EVEN;
607                                 dbg("%s - parity = EVEN", __func__);
608                         }
609                 }
610                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
611                         dev_err(&port->dev, "Parity mode not supported "
612                                         "by device\n");
613         }
614
615         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
616                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
617                 bits &= ~BITS_STOP_MASK;
618                 if (cflag & CSTOPB) {
619                         bits |= BITS_STOP_2;
620                         dbg("%s - stop bits = 2", __func__);
621                 } else {
622                         bits |= BITS_STOP_1;
623                         dbg("%s - stop bits = 1", __func__);
624                 }
625                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
626                         dev_err(&port->dev, "Number of stop bits requested "
627                                         "not supported by device\n");
628         }
629
630         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
631                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
632                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
633                                 __func__, modem_ctl[0], modem_ctl[1],
634                                 modem_ctl[2], modem_ctl[3]);
635
636                 if (cflag & CRTSCTS) {
637                         modem_ctl[0] &= ~0x7B;
638                         modem_ctl[0] |= 0x09;
639                         modem_ctl[1] = 0x80;
640                         dbg("%s - flow control = CRTSCTS", __func__);
641                 } else {
642                         modem_ctl[0] &= ~0x7B;
643                         modem_ctl[0] |= 0x01;
644                         modem_ctl[1] |= 0x40;
645                         dbg("%s - flow control = NONE", __func__);
646                 }
647
648                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
649                                 __func__, modem_ctl[0], modem_ctl[1],
650                                 modem_ctl[2], modem_ctl[3]);
651                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
652         }
653
654 }
655
656 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
657                 unsigned int set, unsigned int clear)
658 {
659         struct usb_serial_port *port = tty->driver_data;
660         unsigned int control = 0;
661
662         dbg("%s - port %d", __func__, port->number);
663
664         if (set & TIOCM_RTS) {
665                 control |= CONTROL_RTS;
666                 control |= CONTROL_WRITE_RTS;
667         }
668         if (set & TIOCM_DTR) {
669                 control |= CONTROL_DTR;
670                 control |= CONTROL_WRITE_DTR;
671         }
672         if (clear & TIOCM_RTS) {
673                 control &= ~CONTROL_RTS;
674                 control |= CONTROL_WRITE_RTS;
675         }
676         if (clear & TIOCM_DTR) {
677                 control &= ~CONTROL_DTR;
678                 control |= CONTROL_WRITE_DTR;
679         }
680
681         dbg("%s - control = 0x%.4x", __func__, control);
682
683         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
684
685 }
686
687 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
688 {
689         struct usb_serial_port *port = tty->driver_data;
690         unsigned int control;
691         int result;
692
693         dbg("%s - port %d", __func__, port->number);
694
695         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
696
697         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
698                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
699                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
700                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
701                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
702                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
703
704         dbg("%s - control = 0x%.2x", __func__, control);
705
706         return result;
707 }
708
709 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
710 {
711         struct usb_serial_port *port = tty->driver_data;
712         unsigned int state;
713
714         dbg("%s - port %d", __func__, port->number);
715         if (break_state == 0)
716                 state = BREAK_OFF;
717         else
718                 state = BREAK_ON;
719         dbg("%s - turning break %s", __func__,
720                         state == BREAK_OFF ? "off" : "on");
721         cp2101_set_config(port, CP2101_BREAK, &state, 2);
722 }
723
724 static int cp2101_startup(struct usb_serial *serial)
725 {
726         /* CP2101 buffers behave strangely unless device is reset */
727         usb_reset_device(serial->dev);
728         return 0;
729 }
730
731 static void cp2101_shutdown(struct usb_serial *serial)
732 {
733         int i;
734
735         dbg("%s", __func__);
736
737         /* Stop reads and writes on all ports */
738         for (i = 0; i < serial->num_ports; ++i)
739                 cp2101_cleanup(serial->port[i]);
740 }
741
742 static int __init cp2101_init(void)
743 {
744         int retval;
745
746         retval = usb_serial_register(&cp2101_device);
747         if (retval)
748                 return retval; /* Failed to register */
749
750         retval = usb_register(&cp2101_driver);
751         if (retval) {
752                 /* Failed to register */
753                 usb_serial_deregister(&cp2101_device);
754                 return retval;
755         }
756
757         /* Success */
758         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
759                DRIVER_DESC "\n");
760         return 0;
761 }
762
763 static void __exit cp2101_exit(void)
764 {
765         usb_deregister(&cp2101_driver);
766         usb_serial_deregister(&cp2101_device);
767 }
768
769 module_init(cp2101_init);
770 module_exit(cp2101_exit);
771
772 MODULE_DESCRIPTION(DRIVER_DESC);
773 MODULE_VERSION(DRIVER_VERSION);
774 MODULE_LICENSE("GPL");
775
776 module_param(debug, bool, S_IRUGO | S_IWUSR);
777 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");