tty: cp210x: Fix carrier handling
[linux-2.6/mini2440.git] / drivers / usb / serial / cp210x.c
blobbd254ec97d14be6d9b9e4db7e64bfbbca1f7d14c
1 /*
2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
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.
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
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>
28 * Version Information
30 #define DRIVER_VERSION "v0.09"
31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
34 * Function Prototypes
36 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
37 static void cp210x_cleanup(struct usb_serial_port *);
38 static void cp210x_close(struct usb_serial_port *);
39 static void cp210x_get_termios(struct tty_struct *,
40 struct usb_serial_port *port);
41 static void cp210x_get_termios_port(struct usb_serial_port *port,
42 unsigned int *cflagp, unsigned int *baudp);
43 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
44 struct ktermios*);
45 static int cp210x_tiocmget(struct tty_struct *, struct file *);
46 static int cp210x_tiocmset(struct tty_struct *, struct file *,
47 unsigned int, unsigned int);
48 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
49 unsigned int, unsigned int);
50 static void cp210x_break_ctl(struct tty_struct *, int);
51 static int cp210x_startup(struct usb_serial *);
52 static void cp210x_disconnect(struct usb_serial *);
53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
54 static int cp210x_carrier_raised(struct usb_serial_port *p);
56 static int debug;
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(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
62 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
63 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
64 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
65 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
66 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
75 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
76 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
77 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
78 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
79 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
80 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
81 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
82 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
83 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
84 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
85 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
86 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
87 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
88 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
89 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
90 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
91 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
92 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
93 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
94 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
95 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
96 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
97 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
98 { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
99 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
100 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
101 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
102 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
103 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
104 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
105 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
106 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
107 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
108 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
109 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
110 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
111 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
112 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
113 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
114 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
115 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
116 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
117 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
118 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
119 { } /* Terminating Entry */
122 MODULE_DEVICE_TABLE(usb, id_table);
124 static struct usb_driver cp210x_driver = {
125 .name = "cp210x",
126 .probe = usb_serial_probe,
127 .disconnect = usb_serial_disconnect,
128 .id_table = id_table,
129 .no_dynamic_id = 1,
132 static struct usb_serial_driver cp210x_device = {
133 .driver = {
134 .owner = THIS_MODULE,
135 .name = "cp210x",
137 .usb_driver = &cp210x_driver,
138 .id_table = id_table,
139 .num_ports = 1,
140 .open = cp210x_open,
141 .close = cp210x_close,
142 .break_ctl = cp210x_break_ctl,
143 .set_termios = cp210x_set_termios,
144 .tiocmget = cp210x_tiocmget,
145 .tiocmset = cp210x_tiocmset,
146 .attach = cp210x_startup,
147 .disconnect = cp210x_disconnect,
148 .dtr_rts = cp210x_dtr_rts,
149 .carrier_raised = cp210x_carrier_raised
152 /* Config request types */
153 #define REQTYPE_HOST_TO_DEVICE 0x41
154 #define REQTYPE_DEVICE_TO_HOST 0xc1
156 /* Config request codes */
157 #define CP210X_IFC_ENABLE 0x00
158 #define CP210X_SET_BAUDDIV 0x01
159 #define CP210X_GET_BAUDDIV 0x02
160 #define CP210X_SET_LINE_CTL 0x03
161 #define CP210X_GET_LINE_CTL 0x04
162 #define CP210X_SET_BREAK 0x05
163 #define CP210X_IMM_CHAR 0x06
164 #define CP210X_SET_MHS 0x07
165 #define CP210X_GET_MDMSTS 0x08
166 #define CP210X_SET_XON 0x09
167 #define CP210X_SET_XOFF 0x0A
168 #define CP210X_SET_EVENTMASK 0x0B
169 #define CP210X_GET_EVENTMASK 0x0C
170 #define CP210X_SET_CHAR 0x0D
171 #define CP210X_GET_CHARS 0x0E
172 #define CP210X_GET_PROPS 0x0F
173 #define CP210X_GET_COMM_STATUS 0x10
174 #define CP210X_RESET 0x11
175 #define CP210X_PURGE 0x12
176 #define CP210X_SET_FLOW 0x13
177 #define CP210X_GET_FLOW 0x14
178 #define CP210X_EMBED_EVENTS 0x15
179 #define CP210X_GET_EVENTSTATE 0x16
180 #define CP210X_SET_CHARS 0x19
182 /* CP210X_IFC_ENABLE */
183 #define UART_ENABLE 0x0001
184 #define UART_DISABLE 0x0000
186 /* CP210X_(SET|GET)_BAUDDIV */
187 #define BAUD_RATE_GEN_FREQ 0x384000
189 /* CP210X_(SET|GET)_LINE_CTL */
190 #define BITS_DATA_MASK 0X0f00
191 #define BITS_DATA_5 0X0500
192 #define BITS_DATA_6 0X0600
193 #define BITS_DATA_7 0X0700
194 #define BITS_DATA_8 0X0800
195 #define BITS_DATA_9 0X0900
197 #define BITS_PARITY_MASK 0x00f0
198 #define BITS_PARITY_NONE 0x0000
199 #define BITS_PARITY_ODD 0x0010
200 #define BITS_PARITY_EVEN 0x0020
201 #define BITS_PARITY_MARK 0x0030
202 #define BITS_PARITY_SPACE 0x0040
204 #define BITS_STOP_MASK 0x000f
205 #define BITS_STOP_1 0x0000
206 #define BITS_STOP_1_5 0x0001
207 #define BITS_STOP_2 0x0002
209 /* CP210X_SET_BREAK */
210 #define BREAK_ON 0x0000
211 #define BREAK_OFF 0x0001
213 /* CP210X_(SET_MHS|GET_MDMSTS) */
214 #define CONTROL_DTR 0x0001
215 #define CONTROL_RTS 0x0002
216 #define CONTROL_CTS 0x0010
217 #define CONTROL_DSR 0x0020
218 #define CONTROL_RING 0x0040
219 #define CONTROL_DCD 0x0080
220 #define CONTROL_WRITE_DTR 0x0100
221 #define CONTROL_WRITE_RTS 0x0200
224 * cp210x_get_config
225 * Reads from the CP210x configuration registers
226 * 'size' is specified in bytes.
227 * 'data' is a pointer to a pre-allocated array of integers large
228 * enough to hold 'size' bytes (with 4 bytes to each integer)
230 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
231 unsigned int *data, int size)
233 struct usb_serial *serial = port->serial;
234 __le32 *buf;
235 int result, i, length;
237 /* Number of integers required to contain the array */
238 length = (((size - 1) | 3) + 1)/4;
240 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
241 if (!buf) {
242 dev_err(&port->dev, "%s - out of memory.\n", __func__);
243 return -ENOMEM;
246 /* Issue the request, attempting to read 'size' bytes */
247 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
248 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
249 0, buf, size, 300);
251 /* Convert data into an array of integers */
252 for (i = 0; i < length; i++)
253 data[i] = le32_to_cpu(buf[i]);
255 kfree(buf);
257 if (result != size) {
258 dbg("%s - Unable to send config request, "
259 "request=0x%x size=%d result=%d\n",
260 __func__, request, size, result);
261 return -EPROTO;
264 return 0;
268 * cp210x_set_config
269 * Writes to the CP210x configuration registers
270 * Values less than 16 bits wide are sent directly
271 * 'size' is specified in bytes.
273 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
274 unsigned int *data, int size)
276 struct usb_serial *serial = port->serial;
277 __le32 *buf;
278 int result, i, length;
280 /* Number of integers required to contain the array */
281 length = (((size - 1) | 3) + 1)/4;
283 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
284 if (!buf) {
285 dev_err(&port->dev, "%s - out of memory.\n",
286 __func__);
287 return -ENOMEM;
290 /* Array of integers into bytes */
291 for (i = 0; i < length; i++)
292 buf[i] = cpu_to_le32(data[i]);
294 if (size > 2) {
295 result = usb_control_msg(serial->dev,
296 usb_sndctrlpipe(serial->dev, 0),
297 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
298 0, buf, size, 300);
299 } else {
300 result = usb_control_msg(serial->dev,
301 usb_sndctrlpipe(serial->dev, 0),
302 request, REQTYPE_HOST_TO_DEVICE, data[0],
303 0, NULL, 0, 300);
306 kfree(buf);
308 if ((size > 2 && result != size) || result < 0) {
309 dbg("%s - Unable to send request, "
310 "request=0x%x size=%d result=%d\n",
311 __func__, request, size, result);
312 return -EPROTO;
315 /* Single data value */
316 result = usb_control_msg(serial->dev,
317 usb_sndctrlpipe(serial->dev, 0),
318 request, REQTYPE_HOST_TO_DEVICE, data[0],
319 0, NULL, 0, 300);
320 return 0;
324 * cp210x_set_config_single
325 * Convenience function for calling cp210x_set_config on single data values
326 * without requiring an integer pointer
328 static inline int cp210x_set_config_single(struct usb_serial_port *port,
329 u8 request, unsigned int data)
331 return cp210x_set_config(port, request, &data, 2);
335 * cp210x_quantise_baudrate
336 * Quantises the baud rate as per AN205 Table 1
338 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
339 if (baud <= 56) baud = 0;
340 else if (baud <= 300) baud = 300;
341 else if (baud <= 600) baud = 600;
342 else if (baud <= 1200) baud = 1200;
343 else if (baud <= 1800) baud = 1800;
344 else if (baud <= 2400) baud = 2400;
345 else if (baud <= 4000) baud = 4000;
346 else if (baud <= 4803) baud = 4800;
347 else if (baud <= 7207) baud = 7200;
348 else if (baud <= 9612) baud = 9600;
349 else if (baud <= 14428) baud = 14400;
350 else if (baud <= 16062) baud = 16000;
351 else if (baud <= 19250) baud = 19200;
352 else if (baud <= 28912) baud = 28800;
353 else if (baud <= 38601) baud = 38400;
354 else if (baud <= 51558) baud = 51200;
355 else if (baud <= 56280) baud = 56000;
356 else if (baud <= 58053) baud = 57600;
357 else if (baud <= 64111) baud = 64000;
358 else if (baud <= 77608) baud = 76800;
359 else if (baud <= 117028) baud = 115200;
360 else if (baud <= 129347) baud = 128000;
361 else if (baud <= 156868) baud = 153600;
362 else if (baud <= 237832) baud = 230400;
363 else if (baud <= 254234) baud = 250000;
364 else if (baud <= 273066) baud = 256000;
365 else if (baud <= 491520) baud = 460800;
366 else if (baud <= 567138) baud = 500000;
367 else if (baud <= 670254) baud = 576000;
368 else if (baud <= 1053257) baud = 921600;
369 else if (baud <= 1474560) baud = 1228800;
370 else if (baud <= 2457600) baud = 1843200;
371 else baud = 3686400;
372 return baud;
375 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
377 struct usb_serial *serial = port->serial;
378 int result;
380 dbg("%s - port %d", __func__, port->number);
382 if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
383 dev_err(&port->dev, "%s - Unable to enable UART\n",
384 __func__);
385 return -EPROTO;
388 /* Start reading from the device */
389 usb_fill_bulk_urb(port->read_urb, serial->dev,
390 usb_rcvbulkpipe(serial->dev,
391 port->bulk_in_endpointAddress),
392 port->read_urb->transfer_buffer,
393 port->read_urb->transfer_buffer_length,
394 serial->type->read_bulk_callback,
395 port);
396 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
397 if (result) {
398 dev_err(&port->dev, "%s - failed resubmitting read urb, "
399 "error %d\n", __func__, result);
400 return result;
403 /* Configure the termios structure */
404 cp210x_get_termios(tty, port);
405 return 0;
408 static void cp210x_cleanup(struct usb_serial_port *port)
410 struct usb_serial *serial = port->serial;
412 dbg("%s - port %d", __func__, port->number);
414 if (serial->dev) {
415 /* shutdown any bulk reads that might be going on */
416 if (serial->num_bulk_out)
417 usb_kill_urb(port->write_urb);
418 if (serial->num_bulk_in)
419 usb_kill_urb(port->read_urb);
423 static void cp210x_close(struct usb_serial_port *port)
425 dbg("%s - port %d", __func__, port->number);
427 /* shutdown our urbs */
428 dbg("%s - shutting down urbs", __func__);
429 usb_kill_urb(port->write_urb);
430 usb_kill_urb(port->read_urb);
432 mutex_lock(&port->serial->disc_mutex);
433 if (!port->serial->disconnected)
434 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
435 mutex_unlock(&port->serial->disc_mutex);
439 * cp210x_get_termios
440 * Reads the baud rate, data bits, parity, stop bits and flow control mode
441 * from the device, corrects any unsupported values, and configures the
442 * termios structure to reflect the state of the device
444 static void cp210x_get_termios(struct tty_struct *tty,
445 struct usb_serial_port *port)
447 unsigned int baud;
449 if (tty) {
450 cp210x_get_termios_port(tty->driver_data,
451 &tty->termios->c_cflag, &baud);
452 tty_encode_baud_rate(tty, baud, baud);
455 else {
456 unsigned int cflag;
457 cflag = 0;
458 cp210x_get_termios_port(port, &cflag, &baud);
463 * cp210x_get_termios_port
464 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
466 static void cp210x_get_termios_port(struct usb_serial_port *port,
467 unsigned int *cflagp, unsigned int *baudp)
469 unsigned int cflag, modem_ctl[4];
470 unsigned int baud;
471 unsigned int bits;
473 dbg("%s - port %d", __func__, port->number);
475 cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
476 /* Convert to baudrate */
477 if (baud)
478 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
480 dbg("%s - baud rate = %d", __func__, baud);
481 *baudp = baud;
483 cflag = *cflagp;
485 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
486 cflag &= ~CSIZE;
487 switch (bits & BITS_DATA_MASK) {
488 case BITS_DATA_5:
489 dbg("%s - data bits = 5", __func__);
490 cflag |= CS5;
491 break;
492 case BITS_DATA_6:
493 dbg("%s - data bits = 6", __func__);
494 cflag |= CS6;
495 break;
496 case BITS_DATA_7:
497 dbg("%s - data bits = 7", __func__);
498 cflag |= CS7;
499 break;
500 case BITS_DATA_8:
501 dbg("%s - data bits = 8", __func__);
502 cflag |= CS8;
503 break;
504 case BITS_DATA_9:
505 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
506 __func__);
507 cflag |= CS8;
508 bits &= ~BITS_DATA_MASK;
509 bits |= BITS_DATA_8;
510 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
511 break;
512 default:
513 dbg("%s - Unknown number of data bits, using 8", __func__);
514 cflag |= CS8;
515 bits &= ~BITS_DATA_MASK;
516 bits |= BITS_DATA_8;
517 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
518 break;
521 switch (bits & BITS_PARITY_MASK) {
522 case BITS_PARITY_NONE:
523 dbg("%s - parity = NONE", __func__);
524 cflag &= ~PARENB;
525 break;
526 case BITS_PARITY_ODD:
527 dbg("%s - parity = ODD", __func__);
528 cflag |= (PARENB|PARODD);
529 break;
530 case BITS_PARITY_EVEN:
531 dbg("%s - parity = EVEN", __func__);
532 cflag &= ~PARODD;
533 cflag |= PARENB;
534 break;
535 case BITS_PARITY_MARK:
536 dbg("%s - parity = MARK (not supported, disabling parity)",
537 __func__);
538 cflag &= ~PARENB;
539 bits &= ~BITS_PARITY_MASK;
540 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
541 break;
542 case BITS_PARITY_SPACE:
543 dbg("%s - parity = SPACE (not supported, disabling parity)",
544 __func__);
545 cflag &= ~PARENB;
546 bits &= ~BITS_PARITY_MASK;
547 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
548 break;
549 default:
550 dbg("%s - Unknown parity mode, disabling parity", __func__);
551 cflag &= ~PARENB;
552 bits &= ~BITS_PARITY_MASK;
553 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
554 break;
557 cflag &= ~CSTOPB;
558 switch (bits & BITS_STOP_MASK) {
559 case BITS_STOP_1:
560 dbg("%s - stop bits = 1", __func__);
561 break;
562 case BITS_STOP_1_5:
563 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
564 __func__);
565 bits &= ~BITS_STOP_MASK;
566 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
567 break;
568 case BITS_STOP_2:
569 dbg("%s - stop bits = 2", __func__);
570 cflag |= CSTOPB;
571 break;
572 default:
573 dbg("%s - Unknown number of stop bits, using 1 stop bit",
574 __func__);
575 bits &= ~BITS_STOP_MASK;
576 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
577 break;
580 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
581 if (modem_ctl[0] & 0x0008) {
582 dbg("%s - flow control = CRTSCTS", __func__);
583 cflag |= CRTSCTS;
584 } else {
585 dbg("%s - flow control = NONE", __func__);
586 cflag &= ~CRTSCTS;
589 *cflagp = cflag;
592 static void cp210x_set_termios(struct tty_struct *tty,
593 struct usb_serial_port *port, struct ktermios *old_termios)
595 unsigned int cflag, old_cflag;
596 unsigned int baud = 0, bits;
597 unsigned int modem_ctl[4];
599 dbg("%s - port %d", __func__, port->number);
601 if (!tty)
602 return;
604 tty->termios->c_cflag &= ~CMSPAR;
605 cflag = tty->termios->c_cflag;
606 old_cflag = old_termios->c_cflag;
607 baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
609 /* If the baud rate is to be updated*/
610 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
611 dbg("%s - Setting baud rate to %d baud", __func__,
612 baud);
613 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
614 ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
615 dbg("Baud rate requested not supported by device\n");
616 baud = tty_termios_baud_rate(old_termios);
619 /* Report back the resulting baud rate */
620 tty_encode_baud_rate(tty, baud, baud);
622 /* If the number of data bits is to be updated */
623 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
624 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
625 bits &= ~BITS_DATA_MASK;
626 switch (cflag & CSIZE) {
627 case CS5:
628 bits |= BITS_DATA_5;
629 dbg("%s - data bits = 5", __func__);
630 break;
631 case CS6:
632 bits |= BITS_DATA_6;
633 dbg("%s - data bits = 6", __func__);
634 break;
635 case CS7:
636 bits |= BITS_DATA_7;
637 dbg("%s - data bits = 7", __func__);
638 break;
639 case CS8:
640 bits |= BITS_DATA_8;
641 dbg("%s - data bits = 8", __func__);
642 break;
643 /*case CS9:
644 bits |= BITS_DATA_9;
645 dbg("%s - data bits = 9", __func__);
646 break;*/
647 default:
648 dbg("cp210x driver does not "
649 "support the number of bits requested,"
650 " using 8 bit mode\n");
651 bits |= BITS_DATA_8;
652 break;
654 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
655 dbg("Number of data bits requested "
656 "not supported by device\n");
659 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
660 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
661 bits &= ~BITS_PARITY_MASK;
662 if (cflag & PARENB) {
663 if (cflag & PARODD) {
664 bits |= BITS_PARITY_ODD;
665 dbg("%s - parity = ODD", __func__);
666 } else {
667 bits |= BITS_PARITY_EVEN;
668 dbg("%s - parity = EVEN", __func__);
671 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
672 dbg("Parity mode not supported "
673 "by device\n");
676 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
677 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
678 bits &= ~BITS_STOP_MASK;
679 if (cflag & CSTOPB) {
680 bits |= BITS_STOP_2;
681 dbg("%s - stop bits = 2", __func__);
682 } else {
683 bits |= BITS_STOP_1;
684 dbg("%s - stop bits = 1", __func__);
686 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
687 dbg("Number of stop bits requested "
688 "not supported by device\n");
691 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
692 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
693 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
694 __func__, modem_ctl[0], modem_ctl[1],
695 modem_ctl[2], modem_ctl[3]);
697 if (cflag & CRTSCTS) {
698 modem_ctl[0] &= ~0x7B;
699 modem_ctl[0] |= 0x09;
700 modem_ctl[1] = 0x80;
701 dbg("%s - flow control = CRTSCTS", __func__);
702 } else {
703 modem_ctl[0] &= ~0x7B;
704 modem_ctl[0] |= 0x01;
705 modem_ctl[1] |= 0x40;
706 dbg("%s - flow control = NONE", __func__);
709 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
710 __func__, modem_ctl[0], modem_ctl[1],
711 modem_ctl[2], modem_ctl[3]);
712 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
717 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
718 unsigned int set, unsigned int clear)
720 struct usb_serial_port *port = tty->driver_data;
721 return cp210x_tiocmset_port(port, file, set, clear);
724 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
725 unsigned int set, unsigned int clear)
727 unsigned int control = 0;
729 dbg("%s - port %d", __func__, port->number);
731 if (set & TIOCM_RTS) {
732 control |= CONTROL_RTS;
733 control |= CONTROL_WRITE_RTS;
735 if (set & TIOCM_DTR) {
736 control |= CONTROL_DTR;
737 control |= CONTROL_WRITE_DTR;
739 if (clear & TIOCM_RTS) {
740 control &= ~CONTROL_RTS;
741 control |= CONTROL_WRITE_RTS;
743 if (clear & TIOCM_DTR) {
744 control &= ~CONTROL_DTR;
745 control |= CONTROL_WRITE_DTR;
748 dbg("%s - control = 0x%.4x", __func__, control);
750 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
753 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
755 if (on)
756 cp210x_tiocmset_port(p, NULL, TIOCM_DTR|TIOCM_RTS, 0);
757 else
758 cp210x_tiocmset_port(p, NULL, 0, TIOCM_DTR|TIOCM_RTS);
761 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
763 struct usb_serial_port *port = tty->driver_data;
764 unsigned int control;
765 int result;
767 dbg("%s - port %d", __func__, port->number);
769 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
771 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
772 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
773 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
774 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
775 |((control & CONTROL_RING)? TIOCM_RI : 0)
776 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
778 dbg("%s - control = 0x%.2x", __func__, control);
780 return result;
783 static int cp210x_carrier_raised(struct usb_serial_port *p)
785 unsigned int control;
786 cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
787 if (control & CONTROL_DCD)
788 return 1;
789 return 0;
792 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
794 struct usb_serial_port *port = tty->driver_data;
795 unsigned int state;
797 dbg("%s - port %d", __func__, port->number);
798 if (break_state == 0)
799 state = BREAK_OFF;
800 else
801 state = BREAK_ON;
802 dbg("%s - turning break %s", __func__,
803 state == BREAK_OFF ? "off" : "on");
804 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
807 static int cp210x_startup(struct usb_serial *serial)
809 /* cp210x buffers behave strangely unless device is reset */
810 usb_reset_device(serial->dev);
811 return 0;
814 static void cp210x_disconnect(struct usb_serial *serial)
816 int i;
818 dbg("%s", __func__);
820 /* Stop reads and writes on all ports */
821 for (i = 0; i < serial->num_ports; ++i)
822 cp210x_cleanup(serial->port[i]);
825 static int __init cp210x_init(void)
827 int retval;
829 retval = usb_serial_register(&cp210x_device);
830 if (retval)
831 return retval; /* Failed to register */
833 retval = usb_register(&cp210x_driver);
834 if (retval) {
835 /* Failed to register */
836 usb_serial_deregister(&cp210x_device);
837 return retval;
840 /* Success */
841 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
842 DRIVER_DESC "\n");
843 return 0;
846 static void __exit cp210x_exit(void)
848 usb_deregister(&cp210x_driver);
849 usb_serial_deregister(&cp210x_device);
852 module_init(cp210x_init);
853 module_exit(cp210x_exit);
855 MODULE_DESCRIPTION(DRIVER_DESC);
856 MODULE_VERSION(DRIVER_VERSION);
857 MODULE_LICENSE("GPL");
859 module_param(debug, bool, S_IRUGO | S_IWUSR);
860 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");