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 */
cp2101_get_config(struct usb_serial_port * port,u8 request,unsigned int * data,int size)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 */
cp2101_set_config(struct usb_serial_port * port,u8 request,unsigned int * data,int size)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 */
cp2101_set_config_single(struct usb_serial_port * port,u8 request,unsigned int data)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
cp2101_open(struct tty_struct * tty,struct usb_serial_port * port,struct file * filp)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
cp2101_cleanup(struct usb_serial_port * port)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
cp2101_close(struct tty_struct * tty,struct usb_serial_port * port,struct file * filp)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 */
cp2101_get_termios(struct tty_struct * tty)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
cp2101_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)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
cp2101_tiocmset(struct tty_struct * tty,struct file * file,unsigned int set,unsigned int clear)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
cp2101_tiocmget(struct tty_struct * tty,struct file * file)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
cp2101_break_ctl(struct tty_struct * tty,int break_state)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
cp2101_startup(struct usb_serial * serial)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
cp2101_shutdown(struct usb_serial * serial)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
cp2101_init(void)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
cp2101_exit(void)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");
782