]> pilppa.org Git - linux-2.6-omap-h63xx.git/blob - drivers/usb/serial/cp2101.c
Merge branch 'next-s3c-pm' of git://aeryn.fluff.org.uk/bjdooks/linux into devel
[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(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
63         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
64         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
65         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
66         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
67         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
68         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
69         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
70         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
71         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
72         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
73         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
74         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
75         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
76         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
77         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
78         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
79         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
80         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
81         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
82         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
83         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
84         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
85         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
86         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
87         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
88         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
89         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
90         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
91         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
92         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
93         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
94         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
95         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
96         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
97         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
98         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
99         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
100         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
101         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
102         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
103         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
104         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
105         { } /* Terminating Entry */
106 };
107
108 MODULE_DEVICE_TABLE(usb, id_table);
109
110 static struct usb_driver cp2101_driver = {
111         .name           = "cp2101",
112         .probe          = usb_serial_probe,
113         .disconnect     = usb_serial_disconnect,
114         .id_table       = id_table,
115         .no_dynamic_id  =       1,
116 };
117
118 static struct usb_serial_driver cp2101_device = {
119         .driver = {
120                 .owner =        THIS_MODULE,
121                 .name =         "cp2101",
122         },
123         .usb_driver             = &cp2101_driver,
124         .id_table               = id_table,
125         .num_ports              = 1,
126         .open                   = cp2101_open,
127         .close                  = cp2101_close,
128         .break_ctl              = cp2101_break_ctl,
129         .set_termios            = cp2101_set_termios,
130         .tiocmget               = cp2101_tiocmget,
131         .tiocmset               = cp2101_tiocmset,
132         .attach                 = cp2101_startup,
133         .shutdown               = cp2101_shutdown,
134 };
135
136 /* Config request types */
137 #define REQTYPE_HOST_TO_DEVICE  0x41
138 #define REQTYPE_DEVICE_TO_HOST  0xc1
139
140 /* Config SET requests. To GET, add 1 to the request number */
141 #define CP2101_UART             0x00    /* Enable / Disable */
142 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
143 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
144 #define CP2101_BREAK            0x05    /* On / Off */
145 #define CP2101_CONTROL          0x07    /* Flow control line states */
146 #define CP2101_MODEMCTL         0x13    /* Modem controls */
147 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
148
149 /* CP2101_UART */
150 #define UART_ENABLE             0x0001
151 #define UART_DISABLE            0x0000
152
153 /* CP2101_BAUDRATE */
154 #define BAUD_RATE_GEN_FREQ      0x384000
155
156 /* CP2101_BITS */
157 #define BITS_DATA_MASK          0X0f00
158 #define BITS_DATA_5             0X0500
159 #define BITS_DATA_6             0X0600
160 #define BITS_DATA_7             0X0700
161 #define BITS_DATA_8             0X0800
162 #define BITS_DATA_9             0X0900
163
164 #define BITS_PARITY_MASK        0x00f0
165 #define BITS_PARITY_NONE        0x0000
166 #define BITS_PARITY_ODD         0x0010
167 #define BITS_PARITY_EVEN        0x0020
168 #define BITS_PARITY_MARK        0x0030
169 #define BITS_PARITY_SPACE       0x0040
170
171 #define BITS_STOP_MASK          0x000f
172 #define BITS_STOP_1             0x0000
173 #define BITS_STOP_1_5           0x0001
174 #define BITS_STOP_2             0x0002
175
176 /* CP2101_BREAK */
177 #define BREAK_ON                0x0000
178 #define BREAK_OFF               0x0001
179
180 /* CP2101_CONTROL */
181 #define CONTROL_DTR             0x0001
182 #define CONTROL_RTS             0x0002
183 #define CONTROL_CTS             0x0010
184 #define CONTROL_DSR             0x0020
185 #define CONTROL_RING            0x0040
186 #define CONTROL_DCD             0x0080
187 #define CONTROL_WRITE_DTR       0x0100
188 #define CONTROL_WRITE_RTS       0x0200
189
190 /*
191  * cp2101_get_config
192  * Reads from the CP2101 configuration registers
193  * 'size' is specified in bytes.
194  * 'data' is a pointer to a pre-allocated array of integers large
195  * enough to hold 'size' bytes (with 4 bytes to each integer)
196  */
197 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
198                 unsigned int *data, int size)
199 {
200         struct usb_serial *serial = port->serial;
201         __le32 *buf;
202         int result, i, length;
203
204         /* Number of integers required to contain the array */
205         length = (((size - 1) | 3) + 1)/4;
206
207         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
208         if (!buf) {
209                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
210                 return -ENOMEM;
211         }
212
213         /* For get requests, the request number must be incremented */
214         request++;
215
216         /* Issue the request, attempting to read 'size' bytes */
217         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
218                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
219                                 0, buf, size, 300);
220
221         /* Convert data into an array of integers */
222         for (i = 0; i < length; i++)
223                 data[i] = le32_to_cpu(buf[i]);
224
225         kfree(buf);
226
227         if (result != size) {
228                 dev_err(&port->dev, "%s - Unable to send config request, "
229                                 "request=0x%x size=%d result=%d\n",
230                                 __func__, request, size, result);
231                 return -EPROTO;
232         }
233
234         return 0;
235 }
236
237 /*
238  * cp2101_set_config
239  * Writes to the CP2101 configuration registers
240  * Values less than 16 bits wide are sent directly
241  * 'size' is specified in bytes.
242  */
243 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
244                 unsigned int *data, int size)
245 {
246         struct usb_serial *serial = port->serial;
247         __le32 *buf;
248         int result, i, length;
249
250         /* Number of integers required to contain the array */
251         length = (((size - 1) | 3) + 1)/4;
252
253         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
254         if (!buf) {
255                 dev_err(&port->dev, "%s - out of memory.\n",
256                                 __func__);
257                 return -ENOMEM;
258         }
259
260         /* Array of integers into bytes */
261         for (i = 0; i < length; i++)
262                 buf[i] = cpu_to_le32(data[i]);
263
264         if (size > 2) {
265                 result = usb_control_msg(serial->dev,
266                                 usb_sndctrlpipe(serial->dev, 0),
267                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
268                                 0, buf, size, 300);
269         } else {
270                 result = usb_control_msg(serial->dev,
271                                 usb_sndctrlpipe(serial->dev, 0),
272                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
273                                 0, NULL, 0, 300);
274         }
275
276         kfree(buf);
277
278         if ((size > 2 && result != size) || result < 0) {
279                 dev_err(&port->dev, "%s - Unable to send request, "
280                                 "request=0x%x size=%d result=%d\n",
281                                 __func__, request, size, result);
282                 return -EPROTO;
283         }
284
285         /* Single data value */
286         result = usb_control_msg(serial->dev,
287                         usb_sndctrlpipe(serial->dev, 0),
288                         request, REQTYPE_HOST_TO_DEVICE, data[0],
289                         0, NULL, 0, 300);
290         return 0;
291 }
292
293 /*
294  * cp2101_set_config_single
295  * Convenience function for calling cp2101_set_config on single data values
296  * without requiring an integer pointer
297  */
298 static inline int cp2101_set_config_single(struct usb_serial_port *port,
299                 u8 request, unsigned int data)
300 {
301         return cp2101_set_config(port, request, &data, 2);
302 }
303
304 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
305                                 struct file *filp)
306 {
307         struct usb_serial *serial = port->serial;
308         int result;
309
310         dbg("%s - port %d", __func__, port->number);
311
312         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
313                 dev_err(&port->dev, "%s - Unable to enable UART\n",
314                                 __func__);
315                 return -EPROTO;
316         }
317
318         /* Start reading from the device */
319         usb_fill_bulk_urb(port->read_urb, serial->dev,
320                         usb_rcvbulkpipe(serial->dev,
321                         port->bulk_in_endpointAddress),
322                         port->read_urb->transfer_buffer,
323                         port->read_urb->transfer_buffer_length,
324                         serial->type->read_bulk_callback,
325                         port);
326         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
327         if (result) {
328                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
329                                 "error %d\n", __func__, result);
330                 return result;
331         }
332
333         /* Configure the termios structure */
334         cp2101_get_termios(tty);
335
336         /* Set the DTR and RTS pins low */
337         cp2101_tiocmset(tty, NULL, TIOCM_DTR | TIOCM_RTS, 0);
338
339         return 0;
340 }
341
342 static void cp2101_cleanup(struct usb_serial_port *port)
343 {
344         struct usb_serial *serial = port->serial;
345
346         dbg("%s - port %d", __func__, port->number);
347
348         if (serial->dev) {
349                 /* shutdown any bulk reads that might be going on */
350                 if (serial->num_bulk_out)
351                         usb_kill_urb(port->write_urb);
352                 if (serial->num_bulk_in)
353                         usb_kill_urb(port->read_urb);
354         }
355 }
356
357 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
358                                         struct file *filp)
359 {
360         dbg("%s - port %d", __func__, port->number);
361
362         /* shutdown our urbs */
363         dbg("%s - shutting down urbs", __func__);
364         usb_kill_urb(port->write_urb);
365         usb_kill_urb(port->read_urb);
366
367         mutex_lock(&port->serial->disc_mutex);
368         if (!port->serial->disconnected)
369                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
370         mutex_unlock(&port->serial->disc_mutex);
371 }
372
373 /*
374  * cp2101_get_termios
375  * Reads the baud rate, data bits, parity, stop bits and flow control mode
376  * from the device, corrects any unsupported values, and configures the
377  * termios structure to reflect the state of the device
378  */
379 static void cp2101_get_termios (struct tty_struct *tty)
380 {
381         struct usb_serial_port *port = tty->driver_data;
382         unsigned int cflag, modem_ctl[4];
383         unsigned int baud;
384         unsigned int bits;
385
386         dbg("%s - port %d", __func__, port->number);
387
388         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
389         /* Convert to baudrate */
390         if (baud)
391                 baud = BAUD_RATE_GEN_FREQ / baud;
392
393         dbg("%s - baud rate = %d", __func__, baud);
394
395         tty_encode_baud_rate(tty, baud, baud);
396         cflag = tty->termios->c_cflag;
397
398         cp2101_get_config(port, CP2101_BITS, &bits, 2);
399         cflag &= ~CSIZE;
400         switch (bits & BITS_DATA_MASK) {
401         case BITS_DATA_5:
402                 dbg("%s - data bits = 5", __func__);
403                 cflag |= CS5;
404                 break;
405         case BITS_DATA_6:
406                 dbg("%s - data bits = 6", __func__);
407                 cflag |= CS6;
408                 break;
409         case BITS_DATA_7:
410                 dbg("%s - data bits = 7", __func__);
411                 cflag |= CS7;
412                 break;
413         case BITS_DATA_8:
414                 dbg("%s - data bits = 8", __func__);
415                 cflag |= CS8;
416                 break;
417         case BITS_DATA_9:
418                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
419                                                                 __func__);
420                 cflag |= CS8;
421                 bits &= ~BITS_DATA_MASK;
422                 bits |= BITS_DATA_8;
423                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
424                 break;
425         default:
426                 dbg("%s - Unknown number of data bits, using 8", __func__);
427                 cflag |= CS8;
428                 bits &= ~BITS_DATA_MASK;
429                 bits |= BITS_DATA_8;
430                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
431                 break;
432         }
433
434         switch (bits & BITS_PARITY_MASK) {
435         case BITS_PARITY_NONE:
436                 dbg("%s - parity = NONE", __func__);
437                 cflag &= ~PARENB;
438                 break;
439         case BITS_PARITY_ODD:
440                 dbg("%s - parity = ODD", __func__);
441                 cflag |= (PARENB|PARODD);
442                 break;
443         case BITS_PARITY_EVEN:
444                 dbg("%s - parity = EVEN", __func__);
445                 cflag &= ~PARODD;
446                 cflag |= PARENB;
447                 break;
448         case BITS_PARITY_MARK:
449                 dbg("%s - parity = MARK (not supported, disabling parity)",
450                                 __func__);
451                 cflag &= ~PARENB;
452                 bits &= ~BITS_PARITY_MASK;
453                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
454                 break;
455         case BITS_PARITY_SPACE:
456                 dbg("%s - parity = SPACE (not supported, disabling parity)",
457                                 __func__);
458                 cflag &= ~PARENB;
459                 bits &= ~BITS_PARITY_MASK;
460                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
461                 break;
462         default:
463                 dbg("%s - Unknown parity mode, disabling parity", __func__);
464                 cflag &= ~PARENB;
465                 bits &= ~BITS_PARITY_MASK;
466                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
467                 break;
468         }
469
470         cflag &= ~CSTOPB;
471         switch (bits & BITS_STOP_MASK) {
472         case BITS_STOP_1:
473                 dbg("%s - stop bits = 1", __func__);
474                 break;
475         case BITS_STOP_1_5:
476                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
477                                                                 __func__);
478                 bits &= ~BITS_STOP_MASK;
479                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
480                 break;
481         case BITS_STOP_2:
482                 dbg("%s - stop bits = 2", __func__);
483                 cflag |= CSTOPB;
484                 break;
485         default:
486                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
487                                                                 __func__);
488                 bits &= ~BITS_STOP_MASK;
489                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
490                 break;
491         }
492
493         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
494         if (modem_ctl[0] & 0x0008) {
495                 dbg("%s - flow control = CRTSCTS", __func__);
496                 cflag |= CRTSCTS;
497         } else {
498                 dbg("%s - flow control = NONE", __func__);
499                 cflag &= ~CRTSCTS;
500         }
501
502         tty->termios->c_cflag = cflag;
503 }
504
505 static void cp2101_set_termios(struct tty_struct *tty,
506                 struct usb_serial_port *port, struct ktermios *old_termios)
507 {
508         unsigned int cflag, old_cflag;
509         unsigned int baud = 0, bits;
510         unsigned int modem_ctl[4];
511
512         dbg("%s - port %d", __func__, port->number);
513
514         if (!tty)
515                 return;
516
517         tty->termios->c_cflag &= ~CMSPAR;
518         cflag = tty->termios->c_cflag;
519         old_cflag = old_termios->c_cflag;
520         baud = tty_get_baud_rate(tty);
521
522         /* If the baud rate is to be updated*/
523         if (baud != tty_termios_baud_rate(old_termios)) {
524                 switch (baud) {
525                 case 0:
526                 case 600:
527                 case 1200:
528                 case 1800:
529                 case 2400:
530                 case 4800:
531                 case 7200:
532                 case 9600:
533                 case 14400:
534                 case 19200:
535                 case 28800:
536                 case 38400:
537                 case 55854:
538                 case 57600:
539                 case 115200:
540                 case 127117:
541                 case 230400:
542                 case 460800:
543                 case 921600:
544                 case 3686400:
545                         break;
546                 default:
547                         baud = 9600;
548                         break;
549                 }
550
551                 if (baud) {
552                         dbg("%s - Setting baud rate to %d baud", __func__,
553                                         baud);
554                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
555                                                 (BAUD_RATE_GEN_FREQ / baud))) {
556                                 dev_err(&port->dev, "Baud rate requested not "
557                                                 "supported by device\n");
558                                 baud = tty_termios_baud_rate(old_termios);
559                         }
560                 }
561         }
562         /* Report back the resulting baud rate */
563         tty_encode_baud_rate(tty, baud, baud);
564
565         /* If the number of data bits is to be updated */
566         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
567                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
568                 bits &= ~BITS_DATA_MASK;
569                 switch (cflag & CSIZE) {
570                 case CS5:
571                         bits |= BITS_DATA_5;
572                         dbg("%s - data bits = 5", __func__);
573                         break;
574                 case CS6:
575                         bits |= BITS_DATA_6;
576                         dbg("%s - data bits = 6", __func__);
577                         break;
578                 case CS7:
579                         bits |= BITS_DATA_7;
580                         dbg("%s - data bits = 7", __func__);
581                         break;
582                 case CS8:
583                         bits |= BITS_DATA_8;
584                         dbg("%s - data bits = 8", __func__);
585                         break;
586                 /*case CS9:
587                         bits |= BITS_DATA_9;
588                         dbg("%s - data bits = 9", __func__);
589                         break;*/
590                 default:
591                         dev_err(&port->dev, "cp2101 driver does not "
592                                         "support the number of bits requested,"
593                                         " using 8 bit mode\n");
594                                 bits |= BITS_DATA_8;
595                                 break;
596                 }
597                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
598                         dev_err(&port->dev, "Number of data bits requested "
599                                         "not supported by device\n");
600         }
601
602         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
603                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
604                 bits &= ~BITS_PARITY_MASK;
605                 if (cflag & PARENB) {
606                         if (cflag & PARODD) {
607                                 bits |= BITS_PARITY_ODD;
608                                 dbg("%s - parity = ODD", __func__);
609                         } else {
610                                 bits |= BITS_PARITY_EVEN;
611                                 dbg("%s - parity = EVEN", __func__);
612                         }
613                 }
614                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
615                         dev_err(&port->dev, "Parity mode not supported "
616                                         "by device\n");
617         }
618
619         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
620                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
621                 bits &= ~BITS_STOP_MASK;
622                 if (cflag & CSTOPB) {
623                         bits |= BITS_STOP_2;
624                         dbg("%s - stop bits = 2", __func__);
625                 } else {
626                         bits |= BITS_STOP_1;
627                         dbg("%s - stop bits = 1", __func__);
628                 }
629                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
630                         dev_err(&port->dev, "Number of stop bits requested "
631                                         "not supported by device\n");
632         }
633
634         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
635                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
636                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
637                                 __func__, modem_ctl[0], modem_ctl[1],
638                                 modem_ctl[2], modem_ctl[3]);
639
640                 if (cflag & CRTSCTS) {
641                         modem_ctl[0] &= ~0x7B;
642                         modem_ctl[0] |= 0x09;
643                         modem_ctl[1] = 0x80;
644                         dbg("%s - flow control = CRTSCTS", __func__);
645                 } else {
646                         modem_ctl[0] &= ~0x7B;
647                         modem_ctl[0] |= 0x01;
648                         modem_ctl[1] |= 0x40;
649                         dbg("%s - flow control = NONE", __func__);
650                 }
651
652                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
653                                 __func__, modem_ctl[0], modem_ctl[1],
654                                 modem_ctl[2], modem_ctl[3]);
655                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
656         }
657
658 }
659
660 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
661                 unsigned int set, unsigned int clear)
662 {
663         struct usb_serial_port *port = tty->driver_data;
664         unsigned int control = 0;
665
666         dbg("%s - port %d", __func__, port->number);
667
668         if (set & TIOCM_RTS) {
669                 control |= CONTROL_RTS;
670                 control |= CONTROL_WRITE_RTS;
671         }
672         if (set & TIOCM_DTR) {
673                 control |= CONTROL_DTR;
674                 control |= CONTROL_WRITE_DTR;
675         }
676         if (clear & TIOCM_RTS) {
677                 control &= ~CONTROL_RTS;
678                 control |= CONTROL_WRITE_RTS;
679         }
680         if (clear & TIOCM_DTR) {
681                 control &= ~CONTROL_DTR;
682                 control |= CONTROL_WRITE_DTR;
683         }
684
685         dbg("%s - control = 0x%.4x", __func__, control);
686
687         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
688
689 }
690
691 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
692 {
693         struct usb_serial_port *port = tty->driver_data;
694         unsigned int control;
695         int result;
696
697         dbg("%s - port %d", __func__, port->number);
698
699         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
700
701         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
702                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
703                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
704                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
705                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
706                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
707
708         dbg("%s - control = 0x%.2x", __func__, control);
709
710         return result;
711 }
712
713 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
714 {
715         struct usb_serial_port *port = tty->driver_data;
716         unsigned int state;
717
718         dbg("%s - port %d", __func__, port->number);
719         if (break_state == 0)
720                 state = BREAK_OFF;
721         else
722                 state = BREAK_ON;
723         dbg("%s - turning break %s", __func__,
724                         state == BREAK_OFF ? "off" : "on");
725         cp2101_set_config(port, CP2101_BREAK, &state, 2);
726 }
727
728 static int cp2101_startup(struct usb_serial *serial)
729 {
730         /* CP2101 buffers behave strangely unless device is reset */
731         usb_reset_device(serial->dev);
732         return 0;
733 }
734
735 static void cp2101_shutdown(struct usb_serial *serial)
736 {
737         int i;
738
739         dbg("%s", __func__);
740
741         /* Stop reads and writes on all ports */
742         for (i = 0; i < serial->num_ports; ++i)
743                 cp2101_cleanup(serial->port[i]);
744 }
745
746 static int __init cp2101_init(void)
747 {
748         int retval;
749
750         retval = usb_serial_register(&cp2101_device);
751         if (retval)
752                 return retval; /* Failed to register */
753
754         retval = usb_register(&cp2101_driver);
755         if (retval) {
756                 /* Failed to register */
757                 usb_serial_deregister(&cp2101_device);
758                 return retval;
759         }
760
761         /* Success */
762         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
763                DRIVER_DESC "\n");
764         return 0;
765 }
766
767 static void __exit cp2101_exit(void)
768 {
769         usb_deregister(&cp2101_driver);
770         usb_serial_deregister(&cp2101_device);
771 }
772
773 module_init(cp2101_init);
774 module_exit(cp2101_exit);
775
776 MODULE_DESCRIPTION(DRIVER_DESC);
777 MODULE_VERSION(DRIVER_VERSION);
778 MODULE_LICENSE("GPL");
779
780 module_param(debug, bool, S_IRUGO | S_IWUSR);
781 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");