1 /*
2 * Silicon Laboratories CP210x 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 "v0.09"
31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
32
33 /*
34 * Function Prototypes
35 */
36 static int cp210x_open(struct tty_struct *, struct usb_serial_port *,
37 struct file *);
38 static void cp210x_cleanup(struct usb_serial_port *);
39 static void cp210x_close(struct usb_serial_port *);
40 static void cp210x_get_termios(struct tty_struct *,
41 struct usb_serial_port *port);
42 static void cp210x_get_termios_port(struct usb_serial_port *port,
43 unsigned int *cflagp, unsigned int *baudp);
44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
45 struct ktermios*);
46 static int cp210x_tiocmget(struct tty_struct *, struct file *);
47 static int cp210x_tiocmset(struct tty_struct *, struct file *,
48 unsigned int, unsigned int);
49 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
50 unsigned int, unsigned int);
51 static void cp210x_break_ctl(struct tty_struct *, int);
52 static int cp210x_startup(struct usb_serial *);
53 static void cp210x_disconnect(struct usb_serial *);
54 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
55 static int cp210x_carrier_raised(struct usb_serial_port *p);
56
57 static int debug;
58
59 static struct usb_device_id id_table [] = {
60 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
61 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
63 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
64 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
65 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
66 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
67 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
68 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
69 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
70 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
71 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
72 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
73 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
74 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
75 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
76 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
77 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
78 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
79 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
80 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
81 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
82 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
83 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
84 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
85 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
86 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
87 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
88 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
89 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
90 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
91 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
92 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
93 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
94 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
95 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
96 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
97 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
98 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
99 { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
100 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
101 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
102 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
103 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
104 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
105 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
106 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
107 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
108 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
109 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
110 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
111 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
112 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
113 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
114 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
115 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
116 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
117 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
118 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
119 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
120 { } /* Terminating Entry */
121 };
122
123 MODULE_DEVICE_TABLE(usb, id_table);
124
125 static struct usb_driver cp210x_driver = {
126 .name = "cp210x",
127 .probe = usb_serial_probe,
128 .disconnect = usb_serial_disconnect,
129 .id_table = id_table,
130 .no_dynamic_id = 1,
131 };
132
133 static struct usb_serial_driver cp210x_device = {
134 .driver = {
135 .owner = THIS_MODULE,
136 .name = "cp210x",
137 },
138 .usb_driver = &cp210x_driver,
139 .id_table = id_table,
140 .num_ports = 1,
141 .open = cp210x_open,
142 .close = cp210x_close,
143 .break_ctl = cp210x_break_ctl,
144 .set_termios = cp210x_set_termios,
145 .tiocmget = cp210x_tiocmget,
146 .tiocmset = cp210x_tiocmset,
147 .attach = cp210x_startup,
148 .disconnect = cp210x_disconnect,
149 .dtr_rts = cp210x_dtr_rts,
150 .carrier_raised = cp210x_carrier_raised
151 };
152
153 /* Config request types */
154 #define REQTYPE_HOST_TO_DEVICE 0x41
155 #define REQTYPE_DEVICE_TO_HOST 0xc1
156
157 /* Config request codes */
158 #define CP210X_IFC_ENABLE 0x00
159 #define CP210X_SET_BAUDDIV 0x01
160 #define CP210X_GET_BAUDDIV 0x02
161 #define CP210X_SET_LINE_CTL 0x03
162 #define CP210X_GET_LINE_CTL 0x04
163 #define CP210X_SET_BREAK 0x05
164 #define CP210X_IMM_CHAR 0x06
165 #define CP210X_SET_MHS 0x07
166 #define CP210X_GET_MDMSTS 0x08
167 #define CP210X_SET_XON 0x09
168 #define CP210X_SET_XOFF 0x0A
169 #define CP210X_SET_EVENTMASK 0x0B
170 #define CP210X_GET_EVENTMASK 0x0C
171 #define CP210X_SET_CHAR 0x0D
172 #define CP210X_GET_CHARS 0x0E
173 #define CP210X_GET_PROPS 0x0F
174 #define CP210X_GET_COMM_STATUS 0x10
175 #define CP210X_RESET 0x11
176 #define CP210X_PURGE 0x12
177 #define CP210X_SET_FLOW 0x13
178 #define CP210X_GET_FLOW 0x14
179 #define CP210X_EMBED_EVENTS 0x15
180 #define CP210X_GET_EVENTSTATE 0x16
181 #define CP210X_SET_CHARS 0x19
182
183 /* CP210X_IFC_ENABLE */
184 #define UART_ENABLE 0x0001
185 #define UART_DISABLE 0x0000
186
187 /* CP210X_(SET|GET)_BAUDDIV */
188 #define BAUD_RATE_GEN_FREQ 0x384000
189
190 /* CP210X_(SET|GET)_LINE_CTL */
191 #define BITS_DATA_MASK 0X0f00
192 #define BITS_DATA_5 0X0500
193 #define BITS_DATA_6 0X0600
194 #define BITS_DATA_7 0X0700
195 #define BITS_DATA_8 0X0800
196 #define BITS_DATA_9 0X0900
197
198 #define BITS_PARITY_MASK 0x00f0
199 #define BITS_PARITY_NONE 0x0000
200 #define BITS_PARITY_ODD 0x0010
201 #define BITS_PARITY_EVEN 0x0020
202 #define BITS_PARITY_MARK 0x0030
203 #define BITS_PARITY_SPACE 0x0040
204
205 #define BITS_STOP_MASK 0x000f
206 #define BITS_STOP_1 0x0000
207 #define BITS_STOP_1_5 0x0001
208 #define BITS_STOP_2 0x0002
209
210 /* CP210X_SET_BREAK */
211 #define BREAK_ON 0x0000
212 #define BREAK_OFF 0x0001
213
214 /* CP210X_(SET_MHS|GET_MDMSTS) */
215 #define CONTROL_DTR 0x0001
216 #define CONTROL_RTS 0x0002
217 #define CONTROL_CTS 0x0010
218 #define CONTROL_DSR 0x0020
219 #define CONTROL_RING 0x0040
220 #define CONTROL_DCD 0x0080
221 #define CONTROL_WRITE_DTR 0x0100
222 #define CONTROL_WRITE_RTS 0x0200
223
224 /*
225 * cp210x_get_config
226 * Reads from the CP210x configuration registers
227 * 'size' is specified in bytes.
228 * 'data' is a pointer to a pre-allocated array of integers large
229 * enough to hold 'size' bytes (with 4 bytes to each integer)
230 */
231 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
232 unsigned int *data, int size)
233 {
234 struct usb_serial *serial = port->serial;
235 __le32 *buf;
236 int result, i, length;
237
238 /* Number of integers required to contain the array */
239 length = (((size - 1) | 3) + 1)/4;
240
241 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
242 if (!buf) {
243 dev_err(&port->dev, "%s - out of memory.\n", __func__);
244 return -ENOMEM;
245 }
246
247 /* Issue the request, attempting to read 'size' bytes */
248 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
249 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
250 0, buf, size, 300);
251
252 /* Convert data into an array of integers */
253 for (i = 0; i < length; i++)
254 data[i] = le32_to_cpu(buf[i]);
255
256 kfree(buf);
257
258 if (result != size) {
259 dbg("%s - Unable to send config request, "
260 "request=0x%x size=%d result=%d\n",
261 __func__, request, size, result);
262 return -EPROTO;
263 }
264
265 return 0;
266 }
267
268 /*
269 * cp210x_set_config
270 * Writes to the CP210x configuration registers
271 * Values less than 16 bits wide are sent directly
272 * 'size' is specified in bytes.
273 */
274 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
275 unsigned int *data, int size)
276 {
277 struct usb_serial *serial = port->serial;
278 __le32 *buf;
279 int result, i, length;
280
281 /* Number of integers required to contain the array */
282 length = (((size - 1) | 3) + 1)/4;
283
284 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
285 if (!buf) {
286 dev_err(&port->dev, "%s - out of memory.\n",
287 __func__);
288 return -ENOMEM;
289 }
290
291 /* Array of integers into bytes */
292 for (i = 0; i < length; i++)
293 buf[i] = cpu_to_le32(data[i]);
294
295 if (size > 2) {
296 result = usb_control_msg(serial->dev,
297 usb_sndctrlpipe(serial->dev, 0),
298 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
299 0, buf, size, 300);
300 } else {
301 result = usb_control_msg(serial->dev,
302 usb_sndctrlpipe(serial->dev, 0),
303 request, REQTYPE_HOST_TO_DEVICE, data[0],
304 0, NULL, 0, 300);
305 }
306
307 kfree(buf);
308
309 if ((size > 2 && result != size) || result < 0) {
310 dbg("%s - Unable to send request, "
311 "request=0x%x size=%d result=%d\n",
312 __func__, request, size, result);
313 return -EPROTO;
314 }
315
316 /* Single data value */
317 result = usb_control_msg(serial->dev,
318 usb_sndctrlpipe(serial->dev, 0),
319 request, REQTYPE_HOST_TO_DEVICE, data[0],
320 0, NULL, 0, 300);
321 return 0;
322 }
323
324 /*
325 * cp210x_set_config_single
326 * Convenience function for calling cp210x_set_config on single data values
327 * without requiring an integer pointer
328 */
329 static inline int cp210x_set_config_single(struct usb_serial_port *port,
330 u8 request, unsigned int data)
331 {
332 return cp210x_set_config(port, request, &data, 2);
333 }
334
335 /*
336 * cp210x_quantise_baudrate
337 * Quantises the baud rate as per AN205 Table 1
338 */
339 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
340 if (baud <= 56) baud = 0;
341 else if (baud <= 300) baud = 300;
342 else if (baud <= 600) baud = 600;
343 else if (baud <= 1200) baud = 1200;
344 else if (baud <= 1800) baud = 1800;
345 else if (baud <= 2400) baud = 2400;
346 else if (baud <= 4000) baud = 4000;
347 else if (baud <= 4803) baud = 4800;
348 else if (baud <= 7207) baud = 7200;
349 else if (baud <= 9612) baud = 9600;
350 else if (baud <= 14428) baud = 14400;
351 else if (baud <= 16062) baud = 16000;
352 else if (baud <= 19250) baud = 19200;
353 else if (baud <= 28912) baud = 28800;
354 else if (baud <= 38601) baud = 38400;
355 else if (baud <= 51558) baud = 51200;
356 else if (baud <= 56280) baud = 56000;
357 else if (baud <= 58053) baud = 57600;
358 else if (baud <= 64111) baud = 64000;
359 else if (baud <= 77608) baud = 76800;
360 else if (baud <= 117028) baud = 115200;
361 else if (baud <= 129347) baud = 128000;
362 else if (baud <= 156868) baud = 153600;
363 else if (baud <= 237832) baud = 230400;
364 else if (baud <= 254234) baud = 250000;
365 else if (baud <= 273066) baud = 256000;
366 else if (baud <= 491520) baud = 460800;
367 else if (baud <= 567138) baud = 500000;
368 else if (baud <= 670254) baud = 576000;
369 else if (baud <= 1053257) baud = 921600;
370 else if (baud <= 1474560) baud = 1228800;
371 else if (baud <= 2457600) baud = 1843200;
372 else baud = 3686400;
373 return baud;
374 }
375
376 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port,
377 struct file *filp)
378 {
379 struct usb_serial *serial = port->serial;
380 int result;
381
382 dbg("%s - port %d", __func__, port->number);
383
384 if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
385 dev_err(&port->dev, "%s - Unable to enable UART\n",
386 __func__);
387 return -EPROTO;
388 }
389
390 /* Start reading from the device */
391 usb_fill_bulk_urb(port->read_urb, serial->dev,
392 usb_rcvbulkpipe(serial->dev,
393 port->bulk_in_endpointAddress),
394 port->read_urb->transfer_buffer,
395 port->read_urb->transfer_buffer_length,
396 serial->type->read_bulk_callback,
397 port);
398 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
399 if (result) {
400 dev_err(&port->dev, "%s - failed resubmitting read urb, "
401 "error %d\n", __func__, result);
402 return result;
403 }
404
405 /* Configure the termios structure */
406 cp210x_get_termios(tty, port);
407 return 0;
408 }
409
410 static void cp210x_cleanup(struct usb_serial_port *port)
411 {
412 struct usb_serial *serial = port->serial;
413
414 dbg("%s - port %d", __func__, port->number);
415
416 if (serial->dev) {
417 /* shutdown any bulk reads that might be going on */
418 if (serial->num_bulk_out)
419 usb_kill_urb(port->write_urb);
420 if (serial->num_bulk_in)
421 usb_kill_urb(port->read_urb);
422 }
423 }
424
425 static void cp210x_close(struct usb_serial_port *port)
426 {
427 dbg("%s - port %d", __func__, port->number);
428
429 /* shutdown our urbs */
430 dbg("%s - shutting down urbs", __func__);
431 usb_kill_urb(port->write_urb);
432 usb_kill_urb(port->read_urb);
433
434 mutex_lock(&port->serial->disc_mutex);
435 if (!port->serial->disconnected)
436 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
437 mutex_unlock(&port->serial->disc_mutex);
438 }
439
440 /*
441 * cp210x_get_termios
442 * Reads the baud rate, data bits, parity, stop bits and flow control mode
443 * from the device, corrects any unsupported values, and configures the
444 * termios structure to reflect the state of the device
445 */
446 static void cp210x_get_termios(struct tty_struct *tty,
447 struct usb_serial_port *port)
448 {
449 unsigned int baud;
450
451 if (tty) {
452 cp210x_get_termios_port(tty->driver_data,
453 &tty->termios->c_cflag, &baud);
454 tty_encode_baud_rate(tty, baud, baud);
455 }
456
457 else {
458 unsigned int cflag;
459 cflag = 0;
460 cp210x_get_termios_port(port, &cflag, &baud);
461 }
462 }
463
464 /*
465 * cp210x_get_termios_port
466 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
467 */
468 static void cp210x_get_termios_port(struct usb_serial_port *port,
469 unsigned int *cflagp, unsigned int *baudp)
470 {
471 unsigned int cflag, modem_ctl[4];
472 unsigned int baud;
473 unsigned int bits;
474
475 dbg("%s - port %d", __func__, port->number);
476
477 cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
478 /* Convert to baudrate */
479 if (baud)
480 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
481
482 dbg("%s - baud rate = %d", __func__, baud);
483 *baudp = baud;
484
485 cflag = *cflagp;
486
487 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
488 cflag &= ~CSIZE;
489 switch (bits & BITS_DATA_MASK) {
490 case BITS_DATA_5:
491 dbg("%s - data bits = 5", __func__);
492 cflag |= CS5;
493 break;
494 case BITS_DATA_6:
495 dbg("%s - data bits = 6", __func__);
496 cflag |= CS6;
497 break;
498 case BITS_DATA_7:
499 dbg("%s - data bits = 7", __func__);
500 cflag |= CS7;
501 break;
502 case BITS_DATA_8:
503 dbg("%s - data bits = 8", __func__);
504 cflag |= CS8;
505 break;
506 case BITS_DATA_9:
507 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
508 __func__);
509 cflag |= CS8;
510 bits &= ~BITS_DATA_MASK;
511 bits |= BITS_DATA_8;
512 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
513 break;
514 default:
515 dbg("%s - Unknown number of data bits, using 8", __func__);
516 cflag |= CS8;
517 bits &= ~BITS_DATA_MASK;
518 bits |= BITS_DATA_8;
519 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
520 break;
521 }
522
523 switch (bits & BITS_PARITY_MASK) {
524 case BITS_PARITY_NONE:
525 dbg("%s - parity = NONE", __func__);
526 cflag &= ~PARENB;
527 break;
528 case BITS_PARITY_ODD:
529 dbg("%s - parity = ODD", __func__);
530 cflag |= (PARENB|PARODD);
531 break;
532 case BITS_PARITY_EVEN:
533 dbg("%s - parity = EVEN", __func__);
534 cflag &= ~PARODD;
535 cflag |= PARENB;
536 break;
537 case BITS_PARITY_MARK:
538 dbg("%s - parity = MARK (not supported, disabling parity)",
539 __func__);
540 cflag &= ~PARENB;
541 bits &= ~BITS_PARITY_MASK;
542 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
543 break;
544 case BITS_PARITY_SPACE:
545 dbg("%s - parity = SPACE (not supported, disabling parity)",
546 __func__);
547 cflag &= ~PARENB;
548 bits &= ~BITS_PARITY_MASK;
549 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
550 break;
551 default:
552 dbg("%s - Unknown parity mode, disabling parity", __func__);
553 cflag &= ~PARENB;
554 bits &= ~BITS_PARITY_MASK;
555 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
556 break;
557 }
558
559 cflag &= ~CSTOPB;
560 switch (bits & BITS_STOP_MASK) {
561 case BITS_STOP_1:
562 dbg("%s - stop bits = 1", __func__);
563 break;
564 case BITS_STOP_1_5:
565 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
566 __func__);
567 bits &= ~BITS_STOP_MASK;
568 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
569 break;
570 case BITS_STOP_2:
571 dbg("%s - stop bits = 2", __func__);
572 cflag |= CSTOPB;
573 break;
574 default:
575 dbg("%s - Unknown number of stop bits, using 1 stop bit",
576 __func__);
577 bits &= ~BITS_STOP_MASK;
578 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
579 break;
580 }
581
582 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
583 if (modem_ctl[0] & 0x0008) {
584 dbg("%s - flow control = CRTSCTS", __func__);
585 cflag |= CRTSCTS;
586 } else {
587 dbg("%s - flow control = NONE", __func__);
588 cflag &= ~CRTSCTS;
589 }
590
591 *cflagp = cflag;
592 }
593
594 static void cp210x_set_termios(struct tty_struct *tty,
595 struct usb_serial_port *port, struct ktermios *old_termios)
596 {
597 unsigned int cflag, old_cflag;
598 unsigned int baud = 0, bits;
599 unsigned int modem_ctl[4];
600
601 dbg("%s - port %d", __func__, port->number);
602
603 if (!tty)
604 return;
605
606 tty->termios->c_cflag &= ~CMSPAR;
607 cflag = tty->termios->c_cflag;
608 old_cflag = old_termios->c_cflag;
609 baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
610
611 /* If the baud rate is to be updated*/
612 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
613 dbg("%s - Setting baud rate to %d baud", __func__,
614 baud);
615 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
616 ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
617 dbg("Baud rate requested not supported by device\n");
618 baud = tty_termios_baud_rate(old_termios);
619 }
620 }
621 /* Report back the resulting baud rate */
622 tty_encode_baud_rate(tty, baud, baud);
623
624 /* If the number of data bits is to be updated */
625 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
626 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
627 bits &= ~BITS_DATA_MASK;
628 switch (cflag & CSIZE) {
629 case CS5:
630 bits |= BITS_DATA_5;
631 dbg("%s - data bits = 5", __func__);
632 break;
633 case CS6:
634 bits |= BITS_DATA_6;
635 dbg("%s - data bits = 6", __func__);
636 break;
637 case CS7:
638 bits |= BITS_DATA_7;
639 dbg("%s - data bits = 7", __func__);
640 break;
641 case CS8:
642 bits |= BITS_DATA_8;
643 dbg("%s - data bits = 8", __func__);
644 break;
645 /*case CS9:
646 bits |= BITS_DATA_9;
647 dbg("%s - data bits = 9", __func__);
648 break;*/
649 default:
650 dbg("cp210x driver does not "
651 "support the number of bits requested,"
652 " using 8 bit mode\n");
653 bits |= BITS_DATA_8;
654 break;
655 }
656 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
657 dbg("Number of data bits requested "
658 "not supported by device\n");
659 }
660
661 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
662 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
663 bits &= ~BITS_PARITY_MASK;
664 if (cflag & PARENB) {
665 if (cflag & PARODD) {
666 bits |= BITS_PARITY_ODD;
667 dbg("%s - parity = ODD", __func__);
668 } else {
669 bits |= BITS_PARITY_EVEN;
670 dbg("%s - parity = EVEN", __func__);
671 }
672 }
673 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
674 dbg("Parity mode not supported "
675 "by device\n");
676 }
677
678 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
679 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
680 bits &= ~BITS_STOP_MASK;
681 if (cflag & CSTOPB) {
682 bits |= BITS_STOP_2;
683 dbg("%s - stop bits = 2", __func__);
684 } else {
685 bits |= BITS_STOP_1;
686 dbg("%s - stop bits = 1", __func__);
687 }
688 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
689 dbg("Number of stop bits requested "
690 "not supported by device\n");
691 }
692
693 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
694 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
695 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
696 __func__, modem_ctl[0], modem_ctl[1],
697 modem_ctl[2], modem_ctl[3]);
698
699 if (cflag & CRTSCTS) {
700 modem_ctl[0] &= ~0x7B;
701 modem_ctl[0] |= 0x09;
702 modem_ctl[1] = 0x80;
703 dbg("%s - flow control = CRTSCTS", __func__);
704 } else {
705 modem_ctl[0] &= ~0x7B;
706 modem_ctl[0] |= 0x01;
707 modem_ctl[1] |= 0x40;
708 dbg("%s - flow control = NONE", __func__);
709 }
710
711 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
712 __func__, modem_ctl[0], modem_ctl[1],
713 modem_ctl[2], modem_ctl[3]);
714 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
715 }
716
717 }
718
719 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
720 unsigned int set, unsigned int clear)
721 {
722 struct usb_serial_port *port = tty->driver_data;
723 return cp210x_tiocmset_port(port, file, set, clear);
724 }
725
726 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
727 unsigned int set, unsigned int clear)
728 {
729 unsigned int control = 0;
730
731 dbg("%s - port %d", __func__, port->number);
732
733 if (set & TIOCM_RTS) {
734 control |= CONTROL_RTS;
735 control |= CONTROL_WRITE_RTS;
736 }
737 if (set & TIOCM_DTR) {
738 control |= CONTROL_DTR;
739 control |= CONTROL_WRITE_DTR;
740 }
741 if (clear & TIOCM_RTS) {
742 control &= ~CONTROL_RTS;
743 control |= CONTROL_WRITE_RTS;
744 }
745 if (clear & TIOCM_DTR) {
746 control &= ~CONTROL_DTR;
747 control |= CONTROL_WRITE_DTR;
748 }
749
750 dbg("%s - control = 0x%.4x", __func__, control);
751
752 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
753 }
754
755 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
756 {
757 if (on)
758 cp210x_tiocmset_port(p, NULL, TIOCM_DTR|TIOCM_RTS, 0);
759 else
760 cp210x_tiocmset_port(p, NULL, 0, TIOCM_DTR|TIOCM_RTS);
761 }
762
763 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
764 {
765 struct usb_serial_port *port = tty->driver_data;
766 unsigned int control;
767 int result;
768
769 dbg("%s - port %d", __func__, port->number);
770
771 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
772
773 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
774 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
775 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
776 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
777 |((control & CONTROL_RING)? TIOCM_RI : 0)
778 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
779
780 dbg("%s - control = 0x%.2x", __func__, control);
781
782 return result;
783 }
784
785 static int cp210x_carrier_raised(struct usb_serial_port *p)
786 {
787 unsigned int control;
788 cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
789 if (control & CONTROL_DCD)
790 return 1;
791 return 0;
792 }
793
794 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
795 {
796 struct usb_serial_port *port = tty->driver_data;
797 unsigned int state;
798
799 dbg("%s - port %d", __func__, port->number);
800 if (break_state == 0)
801 state = BREAK_OFF;
802 else
803 state = BREAK_ON;
804 dbg("%s - turning break %s", __func__,
805 state == BREAK_OFF ? "off" : "on");
806 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
807 }
808
809 static int cp210x_startup(struct usb_serial *serial)
810 {
811 /* cp210x buffers behave strangely unless device is reset */
812 usb_reset_device(serial->dev);
813 return 0;
814 }
815
816 static void cp210x_disconnect(struct usb_serial *serial)
817 {
818 int i;
819
820 dbg("%s", __func__);
821
822 /* Stop reads and writes on all ports */
823 for (i = 0; i < serial->num_ports; ++i)
824 cp210x_cleanup(serial->port[i]);
825 }
826
827 static int __init cp210x_init(void)
828 {
829 int retval;
830
831 retval = usb_serial_register(&cp210x_device);
832 if (retval)
833 return retval; /* Failed to register */
834
835 retval = usb_register(&cp210x_driver);
836 if (retval) {
837 /* Failed to register */
838 usb_serial_deregister(&cp210x_device);
839 return retval;
840 }
841
842 /* Success */
843 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
844 DRIVER_DESC "\n");
845 return 0;
846 }
847
848 static void __exit cp210x_exit(void)
849 {
850 usb_deregister(&cp210x_driver);
851 usb_serial_deregister(&cp210x_device);
852 }
853
854 module_init(cp210x_init);
855 module_exit(cp210x_exit);
856
857 MODULE_DESCRIPTION(DRIVER_DESC);
858 MODULE_VERSION(DRIVER_VERSION);
859 MODULE_LICENSE("GPL");
860
861 module_param(debug, bool, S_IRUGO | S_IWUSR);
862 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
863
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