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-rw-r--r--drivers/usb/serial/cp210x.c822
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diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
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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 */
15
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/tty.h>
20#include <linux/tty_flip.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/usb.h>
24#include <linux/uaccess.h>
25#include <linux/usb/serial.h>
26
27/*
28 * Version Information
29 */
30#define DRIVER_VERSION "v0.08"
31#define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
32
33/*
34 * Function Prototypes
35 */
36static int cp2101_open(struct tty_struct *, struct usb_serial_port *,
37 struct file *);
38static void cp2101_cleanup(struct usb_serial_port *);
39static void cp2101_close(struct tty_struct *, struct usb_serial_port *,
40 struct file*);
41static void cp2101_get_termios(struct tty_struct *,
42 struct usb_serial_port *port);
43static void cp2101_get_termios_port(struct usb_serial_port *port,
44 unsigned int *cflagp, unsigned int *baudp);
45static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
46 struct ktermios*);
47static int cp2101_tiocmget(struct tty_struct *, struct file *);
48static int cp2101_tiocmset(struct tty_struct *, struct file *,
49 unsigned int, unsigned int);
50static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *,
51 unsigned int, unsigned int);
52static void cp2101_break_ctl(struct tty_struct *, int);
53static int cp2101_startup(struct usb_serial *);
54static void cp2101_shutdown(struct usb_serial *);
55
56static int debug;
57
58static 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, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
95 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
96 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
97 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
98 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
99 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
100 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
101 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
102 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
103 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
104 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
105 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
106 { } /* Terminating Entry */
107};
108
109MODULE_DEVICE_TABLE(usb, id_table);
110
111static struct usb_driver cp2101_driver = {
112 .name = "cp2101",
113 .probe = usb_serial_probe,
114 .disconnect = usb_serial_disconnect,
115 .id_table = id_table,
116 .no_dynamic_id = 1,
117};
118
119static struct usb_serial_driver cp2101_device = {
120 .driver = {
121 .owner = THIS_MODULE,
122 .name = "cp2101",
123 },
124 .usb_driver = &cp2101_driver,
125 .id_table = id_table,
126 .num_ports = 1,
127 .open = cp2101_open,
128 .close = cp2101_close,
129 .break_ctl = cp2101_break_ctl,
130 .set_termios = cp2101_set_termios,
131 .tiocmget = cp2101_tiocmget,
132 .tiocmset = cp2101_tiocmset,
133 .attach = cp2101_startup,
134 .shutdown = cp2101_shutdown,
135};
136
137/* Config request types */
138#define REQTYPE_HOST_TO_DEVICE 0x41
139#define REQTYPE_DEVICE_TO_HOST 0xc1
140
141/* Config SET requests. To GET, add 1 to the request number */
142#define CP2101_UART 0x00 /* Enable / Disable */
143#define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
144#define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
145#define CP2101_BREAK 0x05 /* On / Off */
146#define CP2101_CONTROL 0x07 /* Flow control line states */
147#define CP2101_MODEMCTL 0x13 /* Modem controls */
148#define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
149
150/* CP2101_UART */
151#define UART_ENABLE 0x0001
152#define UART_DISABLE 0x0000
153
154/* CP2101_BAUDRATE */
155#define BAUD_RATE_GEN_FREQ 0x384000
156
157/* CP2101_BITS */
158#define BITS_DATA_MASK 0X0f00
159#define BITS_DATA_5 0X0500
160#define BITS_DATA_6 0X0600
161#define BITS_DATA_7 0X0700
162#define BITS_DATA_8 0X0800
163#define BITS_DATA_9 0X0900
164
165#define BITS_PARITY_MASK 0x00f0
166#define BITS_PARITY_NONE 0x0000
167#define BITS_PARITY_ODD 0x0010
168#define BITS_PARITY_EVEN 0x0020
169#define BITS_PARITY_MARK 0x0030
170#define BITS_PARITY_SPACE 0x0040
171
172#define BITS_STOP_MASK 0x000f
173#define BITS_STOP_1 0x0000
174#define BITS_STOP_1_5 0x0001
175#define BITS_STOP_2 0x0002
176
177/* CP2101_BREAK */
178#define BREAK_ON 0x0000
179#define BREAK_OFF 0x0001
180
181/* CP2101_CONTROL */
182#define CONTROL_DTR 0x0001
183#define CONTROL_RTS 0x0002
184#define CONTROL_CTS 0x0010
185#define CONTROL_DSR 0x0020
186#define CONTROL_RING 0x0040
187#define CONTROL_DCD 0x0080
188#define CONTROL_WRITE_DTR 0x0100
189#define CONTROL_WRITE_RTS 0x0200
190
191/*
192 * cp2101_get_config
193 * Reads from the CP2101 configuration registers
194 * 'size' is specified in bytes.
195 * 'data' is a pointer to a pre-allocated array of integers large
196 * enough to hold 'size' bytes (with 4 bytes to each integer)
197 */
198static int cp2101_get_config(struct usb_serial_port *port, u8 request,
199 unsigned int *data, int size)
200{
201 struct usb_serial *serial = port->serial;
202 __le32 *buf;
203 int result, i, length;
204
205 /* Number of integers required to contain the array */
206 length = (((size - 1) | 3) + 1)/4;
207
208 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
209 if (!buf) {
210 dev_err(&port->dev, "%s - out of memory.\n", __func__);
211 return -ENOMEM;
212 }
213
214 /* For get requests, the request number must be incremented */
215 request++;
216
217 /* Issue the request, attempting to read 'size' bytes */
218 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
219 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
220 0, buf, size, 300);
221
222 /* Convert data into an array of integers */
223 for (i = 0; i < length; i++)
224 data[i] = le32_to_cpu(buf[i]);
225
226 kfree(buf);
227
228 if (result != size) {
229 dbg("%s - Unable to send config request, "
230 "request=0x%x size=%d result=%d\n",
231 __func__, request, size, result);
232 return -EPROTO;
233 }
234
235 return 0;
236}
237
238/*
239 * cp2101_set_config
240 * Writes to the CP2101 configuration registers
241 * Values less than 16 bits wide are sent directly
242 * 'size' is specified in bytes.
243 */
244static int cp2101_set_config(struct usb_serial_port *port, u8 request,
245 unsigned int *data, int size)
246{
247 struct usb_serial *serial = port->serial;
248 __le32 *buf;
249 int result, i, length;
250
251 /* Number of integers required to contain the array */
252 length = (((size - 1) | 3) + 1)/4;
253
254 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
255 if (!buf) {
256 dev_err(&port->dev, "%s - out of memory.\n",
257 __func__);
258 return -ENOMEM;
259 }
260
261 /* Array of integers into bytes */
262 for (i = 0; i < length; i++)
263 buf[i] = cpu_to_le32(data[i]);
264
265 if (size > 2) {
266 result = usb_control_msg(serial->dev,
267 usb_sndctrlpipe(serial->dev, 0),
268 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
269 0, buf, size, 300);
270 } else {
271 result = usb_control_msg(serial->dev,
272 usb_sndctrlpipe(serial->dev, 0),
273 request, REQTYPE_HOST_TO_DEVICE, data[0],
274 0, NULL, 0, 300);
275 }
276
277 kfree(buf);
278
279 if ((size > 2 && result != size) || result < 0) {
280 dbg("%s - Unable to send request, "
281 "request=0x%x size=%d result=%d\n",
282 __func__, request, size, result);
283 return -EPROTO;
284 }
285
286 /* Single data value */
287 result = usb_control_msg(serial->dev,
288 usb_sndctrlpipe(serial->dev, 0),
289 request, REQTYPE_HOST_TO_DEVICE, data[0],
290 0, NULL, 0, 300);
291 return 0;
292}
293
294/*
295 * cp2101_set_config_single
296 * Convenience function for calling cp2101_set_config on single data values
297 * without requiring an integer pointer
298 */
299static inline int cp2101_set_config_single(struct usb_serial_port *port,
300 u8 request, unsigned int data)
301{
302 return cp2101_set_config(port, request, &data, 2);
303}
304
305/*
306 * cp2101_quantise_baudrate
307 * Quantises the baud rate as per AN205 Table 1
308 */
309static unsigned int cp2101_quantise_baudrate(unsigned int baud) {
310 if (baud <= 56) baud = 0;
311 else if (baud <= 300) baud = 300;
312 else if (baud <= 600) baud = 600;
313 else if (baud <= 1200) baud = 1200;
314 else if (baud <= 1800) baud = 1800;
315 else if (baud <= 2400) baud = 2400;
316 else if (baud <= 4000) baud = 4000;
317 else if (baud <= 4803) baud = 4800;
318 else if (baud <= 7207) baud = 7200;
319 else if (baud <= 9612) baud = 9600;
320 else if (baud <= 14428) baud = 14400;
321 else if (baud <= 16062) baud = 16000;
322 else if (baud <= 19250) baud = 19200;
323 else if (baud <= 28912) baud = 28800;
324 else if (baud <= 38601) baud = 38400;
325 else if (baud <= 51558) baud = 51200;
326 else if (baud <= 56280) baud = 56000;
327 else if (baud <= 58053) baud = 57600;
328 else if (baud <= 64111) baud = 64000;
329 else if (baud <= 77608) baud = 76800;
330 else if (baud <= 117028) baud = 115200;
331 else if (baud <= 129347) baud = 128000;
332 else if (baud <= 156868) baud = 153600;
333 else if (baud <= 237832) baud = 230400;
334 else if (baud <= 254234) baud = 250000;
335 else if (baud <= 273066) baud = 256000;
336 else if (baud <= 491520) baud = 460800;
337 else if (baud <= 567138) baud = 500000;
338 else if (baud <= 670254) baud = 576000;
339 else if (baud <= 1053257) baud = 921600;
340 else if (baud <= 1474560) baud = 1228800;
341 else if (baud <= 2457600) baud = 1843200;
342 else baud = 3686400;
343 return baud;
344}
345
346static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
347 struct file *filp)
348{
349 struct usb_serial *serial = port->serial;
350 int result;
351
352 dbg("%s - port %d", __func__, port->number);
353
354 if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
355 dev_err(&port->dev, "%s - Unable to enable UART\n",
356 __func__);
357 return -EPROTO;
358 }
359
360 /* Start reading from the device */
361 usb_fill_bulk_urb(port->read_urb, serial->dev,
362 usb_rcvbulkpipe(serial->dev,
363 port->bulk_in_endpointAddress),
364 port->read_urb->transfer_buffer,
365 port->read_urb->transfer_buffer_length,
366 serial->type->read_bulk_callback,
367 port);
368 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
369 if (result) {
370 dev_err(&port->dev, "%s - failed resubmitting read urb, "
371 "error %d\n", __func__, result);
372 return result;
373 }
374
375 /* Configure the termios structure */
376 cp2101_get_termios(tty, port);
377
378 /* Set the DTR and RTS pins low */
379 cp2101_tiocmset_port(tty ? (struct usb_serial_port *) tty->driver_data
380 : port,
381 NULL, TIOCM_DTR | TIOCM_RTS, 0);
382
383 return 0;
384}
385
386static void cp2101_cleanup(struct usb_serial_port *port)
387{
388 struct usb_serial *serial = port->serial;
389
390 dbg("%s - port %d", __func__, port->number);
391
392 if (serial->dev) {
393 /* shutdown any bulk reads that might be going on */
394 if (serial->num_bulk_out)
395 usb_kill_urb(port->write_urb);
396 if (serial->num_bulk_in)
397 usb_kill_urb(port->read_urb);
398 }
399}
400
401static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
402 struct file *filp)
403{
404 dbg("%s - port %d", __func__, port->number);
405
406 /* shutdown our urbs */
407 dbg("%s - shutting down urbs", __func__);
408 usb_kill_urb(port->write_urb);
409 usb_kill_urb(port->read_urb);
410
411 mutex_lock(&port->serial->disc_mutex);
412 if (!port->serial->disconnected)
413 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
414 mutex_unlock(&port->serial->disc_mutex);
415}
416
417/*
418 * cp2101_get_termios
419 * Reads the baud rate, data bits, parity, stop bits and flow control mode
420 * from the device, corrects any unsupported values, and configures the
421 * termios structure to reflect the state of the device
422 */
423static void cp2101_get_termios(struct tty_struct *tty,
424 struct usb_serial_port *port)
425{
426 unsigned int baud;
427
428 if (tty) {
429 cp2101_get_termios_port(tty->driver_data,
430 &tty->termios->c_cflag, &baud);
431 tty_encode_baud_rate(tty, baud, baud);
432 }
433
434 else {
435 unsigned int cflag;
436 cflag = 0;
437 cp2101_get_termios_port(port, &cflag, &baud);
438 }
439}
440
441/*
442 * cp2101_get_termios_port
443 * This is the heart of cp2101_get_termios which always uses a &usb_serial_port.
444 */
445static void cp2101_get_termios_port(struct usb_serial_port *port,
446 unsigned int *cflagp, unsigned int *baudp)
447{
448 unsigned int cflag, modem_ctl[4];
449 unsigned int baud;
450 unsigned int bits;
451
452 dbg("%s - port %d", __func__, port->number);
453
454 cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
455 /* Convert to baudrate */
456 if (baud)
457 baud = cp2101_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
458
459 dbg("%s - baud rate = %d", __func__, baud);
460 *baudp = baud;
461
462 cflag = *cflagp;
463
464 cp2101_get_config(port, CP2101_BITS, &bits, 2);
465 cflag &= ~CSIZE;
466 switch (bits & BITS_DATA_MASK) {
467 case BITS_DATA_5:
468 dbg("%s - data bits = 5", __func__);
469 cflag |= CS5;
470 break;
471 case BITS_DATA_6:
472 dbg("%s - data bits = 6", __func__);
473 cflag |= CS6;
474 break;
475 case BITS_DATA_7:
476 dbg("%s - data bits = 7", __func__);
477 cflag |= CS7;
478 break;
479 case BITS_DATA_8:
480 dbg("%s - data bits = 8", __func__);
481 cflag |= CS8;
482 break;
483 case BITS_DATA_9:
484 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
485 __func__);
486 cflag |= CS8;
487 bits &= ~BITS_DATA_MASK;
488 bits |= BITS_DATA_8;
489 cp2101_set_config(port, CP2101_BITS, &bits, 2);
490 break;
491 default:
492 dbg("%s - Unknown number of data bits, using 8", __func__);
493 cflag |= CS8;
494 bits &= ~BITS_DATA_MASK;
495 bits |= BITS_DATA_8;
496 cp2101_set_config(port, CP2101_BITS, &bits, 2);
497 break;
498 }
499
500 switch (bits & BITS_PARITY_MASK) {
501 case BITS_PARITY_NONE:
502 dbg("%s - parity = NONE", __func__);
503 cflag &= ~PARENB;
504 break;
505 case BITS_PARITY_ODD:
506 dbg("%s - parity = ODD", __func__);
507 cflag |= (PARENB|PARODD);
508 break;
509 case BITS_PARITY_EVEN:
510 dbg("%s - parity = EVEN", __func__);
511 cflag &= ~PARODD;
512 cflag |= PARENB;
513 break;
514 case BITS_PARITY_MARK:
515 dbg("%s - parity = MARK (not supported, disabling parity)",
516 __func__);
517 cflag &= ~PARENB;
518 bits &= ~BITS_PARITY_MASK;
519 cp2101_set_config(port, CP2101_BITS, &bits, 2);
520 break;
521 case BITS_PARITY_SPACE:
522 dbg("%s - parity = SPACE (not supported, disabling parity)",
523 __func__);
524 cflag &= ~PARENB;
525 bits &= ~BITS_PARITY_MASK;
526 cp2101_set_config(port, CP2101_BITS, &bits, 2);
527 break;
528 default:
529 dbg("%s - Unknown parity mode, disabling parity", __func__);
530 cflag &= ~PARENB;
531 bits &= ~BITS_PARITY_MASK;
532 cp2101_set_config(port, CP2101_BITS, &bits, 2);
533 break;
534 }
535
536 cflag &= ~CSTOPB;
537 switch (bits & BITS_STOP_MASK) {
538 case BITS_STOP_1:
539 dbg("%s - stop bits = 1", __func__);
540 break;
541 case BITS_STOP_1_5:
542 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
543 __func__);
544 bits &= ~BITS_STOP_MASK;
545 cp2101_set_config(port, CP2101_BITS, &bits, 2);
546 break;
547 case BITS_STOP_2:
548 dbg("%s - stop bits = 2", __func__);
549 cflag |= CSTOPB;
550 break;
551 default:
552 dbg("%s - Unknown number of stop bits, using 1 stop bit",
553 __func__);
554 bits &= ~BITS_STOP_MASK;
555 cp2101_set_config(port, CP2101_BITS, &bits, 2);
556 break;
557 }
558
559 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
560 if (modem_ctl[0] & 0x0008) {
561 dbg("%s - flow control = CRTSCTS", __func__);
562 cflag |= CRTSCTS;
563 } else {
564 dbg("%s - flow control = NONE", __func__);
565 cflag &= ~CRTSCTS;
566 }
567
568 *cflagp = cflag;
569}
570
571static void cp2101_set_termios(struct tty_struct *tty,
572 struct usb_serial_port *port, struct ktermios *old_termios)
573{
574 unsigned int cflag, old_cflag;
575 unsigned int baud = 0, bits;
576 unsigned int modem_ctl[4];
577
578 dbg("%s - port %d", __func__, port->number);
579
580 if (!tty)
581 return;
582
583 tty->termios->c_cflag &= ~CMSPAR;
584 cflag = tty->termios->c_cflag;
585 old_cflag = old_termios->c_cflag;
586 baud = cp2101_quantise_baudrate(tty_get_baud_rate(tty));
587
588 /* If the baud rate is to be updated*/
589 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
590 dbg("%s - Setting baud rate to %d baud", __func__,
591 baud);
592 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
593 ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
594 dbg("Baud rate requested not supported by device\n");
595 baud = tty_termios_baud_rate(old_termios);
596 }
597 }
598 /* Report back the resulting baud rate */
599 tty_encode_baud_rate(tty, baud, baud);
600
601 /* If the number of data bits is to be updated */
602 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
603 cp2101_get_config(port, CP2101_BITS, &bits, 2);
604 bits &= ~BITS_DATA_MASK;
605 switch (cflag & CSIZE) {
606 case CS5:
607 bits |= BITS_DATA_5;
608 dbg("%s - data bits = 5", __func__);
609 break;
610 case CS6:
611 bits |= BITS_DATA_6;
612 dbg("%s - data bits = 6", __func__);
613 break;
614 case CS7:
615 bits |= BITS_DATA_7;
616 dbg("%s - data bits = 7", __func__);
617 break;
618 case CS8:
619 bits |= BITS_DATA_8;
620 dbg("%s - data bits = 8", __func__);
621 break;
622 /*case CS9:
623 bits |= BITS_DATA_9;
624 dbg("%s - data bits = 9", __func__);
625 break;*/
626 default:
627 dbg("cp2101 driver does not "
628 "support the number of bits requested,"
629 " using 8 bit mode\n");
630 bits |= BITS_DATA_8;
631 break;
632 }
633 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
634 dbg("Number of data bits requested "
635 "not supported by device\n");
636 }
637
638 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
639 cp2101_get_config(port, CP2101_BITS, &bits, 2);
640 bits &= ~BITS_PARITY_MASK;
641 if (cflag & PARENB) {
642 if (cflag & PARODD) {
643 bits |= BITS_PARITY_ODD;
644 dbg("%s - parity = ODD", __func__);
645 } else {
646 bits |= BITS_PARITY_EVEN;
647 dbg("%s - parity = EVEN", __func__);
648 }
649 }
650 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
651 dbg("Parity mode not supported "
652 "by device\n");
653 }
654
655 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
656 cp2101_get_config(port, CP2101_BITS, &bits, 2);
657 bits &= ~BITS_STOP_MASK;
658 if (cflag & CSTOPB) {
659 bits |= BITS_STOP_2;
660 dbg("%s - stop bits = 2", __func__);
661 } else {
662 bits |= BITS_STOP_1;
663 dbg("%s - stop bits = 1", __func__);
664 }
665 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
666 dbg("Number of stop bits requested "
667 "not supported by device\n");
668 }
669
670 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
671 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
672 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
673 __func__, modem_ctl[0], modem_ctl[1],
674 modem_ctl[2], modem_ctl[3]);
675
676 if (cflag & CRTSCTS) {
677 modem_ctl[0] &= ~0x7B;
678 modem_ctl[0] |= 0x09;
679 modem_ctl[1] = 0x80;
680 dbg("%s - flow control = CRTSCTS", __func__);
681 } else {
682 modem_ctl[0] &= ~0x7B;
683 modem_ctl[0] |= 0x01;
684 modem_ctl[1] |= 0x40;
685 dbg("%s - flow control = NONE", __func__);
686 }
687
688 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
689 __func__, modem_ctl[0], modem_ctl[1],
690 modem_ctl[2], modem_ctl[3]);
691 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
692 }
693
694}
695
696static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
697 unsigned int set, unsigned int clear)
698{
699 struct usb_serial_port *port = tty->driver_data;
700 return cp2101_tiocmset_port(port, file, set, clear);
701}
702
703static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *file,
704 unsigned int set, unsigned int clear)
705{
706 unsigned int control = 0;
707
708 dbg("%s - port %d", __func__, port->number);
709
710 if (set & TIOCM_RTS) {
711 control |= CONTROL_RTS;
712 control |= CONTROL_WRITE_RTS;
713 }
714 if (set & TIOCM_DTR) {
715 control |= CONTROL_DTR;
716 control |= CONTROL_WRITE_DTR;
717 }
718 if (clear & TIOCM_RTS) {
719 control &= ~CONTROL_RTS;
720 control |= CONTROL_WRITE_RTS;
721 }
722 if (clear & TIOCM_DTR) {
723 control &= ~CONTROL_DTR;
724 control |= CONTROL_WRITE_DTR;
725 }
726
727 dbg("%s - control = 0x%.4x", __func__, control);
728
729 return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
730}
731
732static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
733{
734 struct usb_serial_port *port = tty->driver_data;
735 unsigned int control;
736 int result;
737
738 dbg("%s - port %d", __func__, port->number);
739
740 cp2101_get_config(port, CP2101_CONTROL, &control, 1);
741
742 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
743 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
744 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
745 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
746 |((control & CONTROL_RING)? TIOCM_RI : 0)
747 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
748
749 dbg("%s - control = 0x%.2x", __func__, control);
750
751 return result;
752}
753
754static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
755{
756 struct usb_serial_port *port = tty->driver_data;
757 unsigned int state;
758
759 dbg("%s - port %d", __func__, port->number);
760 if (break_state == 0)
761 state = BREAK_OFF;
762 else
763 state = BREAK_ON;
764 dbg("%s - turning break %s", __func__,
765 state == BREAK_OFF ? "off" : "on");
766 cp2101_set_config(port, CP2101_BREAK, &state, 2);
767}
768
769static int cp2101_startup(struct usb_serial *serial)
770{
771 /* CP2101 buffers behave strangely unless device is reset */
772 usb_reset_device(serial->dev);
773 return 0;
774}
775
776static void cp2101_shutdown(struct usb_serial *serial)
777{
778 int i;
779
780 dbg("%s", __func__);
781
782 /* Stop reads and writes on all ports */
783 for (i = 0; i < serial->num_ports; ++i)
784 cp2101_cleanup(serial->port[i]);
785}
786
787static int __init cp2101_init(void)
788{
789 int retval;
790
791 retval = usb_serial_register(&cp2101_device);
792 if (retval)
793 return retval; /* Failed to register */
794
795 retval = usb_register(&cp2101_driver);
796 if (retval) {
797 /* Failed to register */
798 usb_serial_deregister(&cp2101_device);
799 return retval;
800 }
801
802 /* Success */
803 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
804 DRIVER_DESC "\n");
805 return 0;
806}
807
808static void __exit cp2101_exit(void)
809{
810 usb_deregister(&cp2101_driver);
811 usb_serial_deregister(&cp2101_device);
812}
813
814module_init(cp2101_init);
815module_exit(cp2101_exit);
816
817MODULE_DESCRIPTION(DRIVER_DESC);
818MODULE_VERSION(DRIVER_VERSION);
819MODULE_LICENSE("GPL");
820
821module_param(debug, bool, S_IRUGO | S_IWUSR);
822MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-08 03:59:58 -0500