2 * Silicon Laboratories CP2101/CP2102 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
15 * Buffers are not flushed when the port is opened.
16 * Multiple calls to write() may fail with "Resource temporarily unavailable"
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 <asm/uaccess.h>
29 #include "usb-serial.h"
34 #define DRIVER_VERSION "v0.07"
35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
40 static int cp2101_open(struct usb_serial_port
*, struct file
*);
41 static void cp2101_cleanup(struct usb_serial_port
*);
42 static void cp2101_close(struct usb_serial_port
*, struct file
*);
43 static void cp2101_get_termios(struct usb_serial_port
*);
44 static void cp2101_set_termios(struct usb_serial_port
*, struct termios
*);
45 static int cp2101_tiocmget (struct usb_serial_port
*, struct file
*);
46 static int cp2101_tiocmset (struct usb_serial_port
*, struct file
*,
47 unsigned int, unsigned int);
48 static void cp2101_break_ctl(struct usb_serial_port
*, int);
49 static int cp2101_startup (struct usb_serial
*);
50 static void cp2101_shutdown(struct usb_serial
*);
55 static struct usb_device_id id_table
[] = {
56 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
57 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
58 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
59 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
60 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
61 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
62 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
63 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
64 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
65 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
66 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
67 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
68 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
69 { } /* Terminating Entry */
72 MODULE_DEVICE_TABLE (usb
, id_table
);
74 static struct usb_driver cp2101_driver
= {
76 .probe
= usb_serial_probe
,
77 .disconnect
= usb_serial_disconnect
,
82 static struct usb_serial_driver cp2101_device
= {
88 .num_interrupt_in
= 0,
93 .close
= cp2101_close
,
94 .break_ctl
= cp2101_break_ctl
,
95 .set_termios
= cp2101_set_termios
,
96 .tiocmget
= cp2101_tiocmget
,
97 .tiocmset
= cp2101_tiocmset
,
98 .attach
= cp2101_startup
,
99 .shutdown
= cp2101_shutdown
,
102 /* Config request types */
103 #define REQTYPE_HOST_TO_DEVICE 0x41
104 #define REQTYPE_DEVICE_TO_HOST 0xc1
106 /* Config SET requests. To GET, add 1 to the request number */
107 #define CP2101_UART 0x00 /* Enable / Disable */
108 #define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
109 #define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
110 #define CP2101_BREAK 0x05 /* On / Off */
111 #define CP2101_CONTROL 0x07 /* Flow control line states */
112 #define CP2101_MODEMCTL 0x13 /* Modem controls */
113 #define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
116 #define UART_ENABLE 0x0001
117 #define UART_DISABLE 0x0000
119 /* CP2101_BAUDRATE */
120 #define BAUD_RATE_GEN_FREQ 0x384000
123 #define BITS_DATA_MASK 0X0f00
124 #define BITS_DATA_5 0X0500
125 #define BITS_DATA_6 0X0600
126 #define BITS_DATA_7 0X0700
127 #define BITS_DATA_8 0X0800
128 #define BITS_DATA_9 0X0900
130 #define BITS_PARITY_MASK 0x00f0
131 #define BITS_PARITY_NONE 0x0000
132 #define BITS_PARITY_ODD 0x0010
133 #define BITS_PARITY_EVEN 0x0020
134 #define BITS_PARITY_MARK 0x0030
135 #define BITS_PARITY_SPACE 0x0040
137 #define BITS_STOP_MASK 0x000f
138 #define BITS_STOP_1 0x0000
139 #define BITS_STOP_1_5 0x0001
140 #define BITS_STOP_2 0x0002
143 #define BREAK_ON 0x0000
144 #define BREAK_OFF 0x0001
147 #define CONTROL_DTR 0x0001
148 #define CONTROL_RTS 0x0002
149 #define CONTROL_CTS 0x0010
150 #define CONTROL_DSR 0x0020
151 #define CONTROL_RING 0x0040
152 #define CONTROL_DCD 0x0080
153 #define CONTROL_WRITE_DTR 0x0100
154 #define CONTROL_WRITE_RTS 0x0200
158 * Reads from the CP2101 configuration registers
159 * 'size' is specified in bytes.
160 * 'data' is a pointer to a pre-allocated array of integers large
161 * enough to hold 'size' bytes (with 4 bytes to each integer)
163 static int cp2101_get_config(struct usb_serial_port
* port
, u8 request
,
164 unsigned int *data
, int size
)
166 struct usb_serial
*serial
= port
->serial
;
168 int result
, i
, length
;
170 /* Number of integers required to contain the array */
171 length
= (((size
- 1) | 3) + 1)/4;
173 buf
= kcalloc(length
, sizeof(u32
), GFP_KERNEL
);
175 dev_err(&port
->dev
, "%s - out of memory.\n", __FUNCTION__
);
179 /* For get requests, the request number must be incremented */
182 /* Issue the request, attempting to read 'size' bytes */
183 result
= usb_control_msg (serial
->dev
,usb_rcvctrlpipe (serial
->dev
, 0),
184 request
, REQTYPE_DEVICE_TO_HOST
, 0x0000,
187 /* Convert data into an array of integers */
188 for (i
=0; i
<length
; i
++)
189 data
[i
] = le32_to_cpu(buf
[i
]);
193 if (result
!= size
) {
194 dev_err(&port
->dev
, "%s - Unable to send config request, "
195 "request=0x%x size=%d result=%d\n",
196 __FUNCTION__
, request
, size
, result
);
205 * Writes to the CP2101 configuration registers
206 * Values less than 16 bits wide are sent directly
207 * 'size' is specified in bytes.
209 static int cp2101_set_config(struct usb_serial_port
* port
, u8 request
,
210 unsigned int *data
, int size
)
212 struct usb_serial
*serial
= port
->serial
;
214 int result
, i
, length
;
216 /* Number of integers required to contain the array */
217 length
= (((size
- 1) | 3) + 1)/4;
219 buf
= kmalloc(length
* sizeof(u32
), GFP_KERNEL
);
221 dev_err(&port
->dev
, "%s - out of memory.\n",
226 /* Array of integers into bytes */
227 for (i
= 0; i
< length
; i
++)
228 buf
[i
] = cpu_to_le32(data
[i
]);
231 result
= usb_control_msg (serial
->dev
,
232 usb_sndctrlpipe(serial
->dev
, 0),
233 request
, REQTYPE_HOST_TO_DEVICE
, 0x0000,
236 result
= usb_control_msg (serial
->dev
,
237 usb_sndctrlpipe(serial
->dev
, 0),
238 request
, REQTYPE_HOST_TO_DEVICE
, data
[0],
244 if ((size
> 2 && result
!= size
) || result
< 0) {
245 dev_err(&port
->dev
, "%s - Unable to send request, "
246 "request=0x%x size=%d result=%d\n",
247 __FUNCTION__
, request
, size
, result
);
251 /* Single data value */
252 result
= usb_control_msg (serial
->dev
,
253 usb_sndctrlpipe(serial
->dev
, 0),
254 request
, REQTYPE_HOST_TO_DEVICE
, data
[0],
260 * cp2101_set_config_single
261 * Convenience function for calling cp2101_set_config on single data values
262 * without requiring an integer pointer
264 static inline int cp2101_set_config_single(struct usb_serial_port
* port
,
265 u8 request
, unsigned int data
)
267 return cp2101_set_config(port
, request
, &data
, 2);
270 static int cp2101_open (struct usb_serial_port
*port
, struct file
*filp
)
272 struct usb_serial
*serial
= port
->serial
;
275 dbg("%s - port %d", __FUNCTION__
, port
->number
);
277 if (cp2101_set_config_single(port
, CP2101_UART
, UART_ENABLE
)) {
278 dev_err(&port
->dev
, "%s - Unable to enable UART\n",
283 /* Start reading from the device */
284 usb_fill_bulk_urb (port
->read_urb
, serial
->dev
,
285 usb_rcvbulkpipe(serial
->dev
,
286 port
->bulk_in_endpointAddress
),
287 port
->read_urb
->transfer_buffer
,
288 port
->read_urb
->transfer_buffer_length
,
289 serial
->type
->read_bulk_callback
,
291 result
= usb_submit_urb(port
->read_urb
, GFP_KERNEL
);
293 dev_err(&port
->dev
, "%s - failed resubmitting read urb, "
294 "error %d\n", __FUNCTION__
, result
);
298 /* Configure the termios structure */
299 cp2101_get_termios(port
);
301 /* Set the DTR and RTS pins low */
302 cp2101_tiocmset(port
, NULL
, TIOCM_DTR
| TIOCM_RTS
, 0);
307 static void cp2101_cleanup (struct usb_serial_port
*port
)
309 struct usb_serial
*serial
= port
->serial
;
311 dbg("%s - port %d", __FUNCTION__
, port
->number
);
314 /* shutdown any bulk reads that might be going on */
315 if (serial
->num_bulk_out
)
316 usb_kill_urb(port
->write_urb
);
317 if (serial
->num_bulk_in
)
318 usb_kill_urb(port
->read_urb
);
322 static void cp2101_close (struct usb_serial_port
*port
, struct file
* filp
)
324 dbg("%s - port %d", __FUNCTION__
, port
->number
);
326 /* shutdown our urbs */
327 dbg("%s - shutting down urbs", __FUNCTION__
);
328 usb_kill_urb(port
->write_urb
);
329 usb_kill_urb(port
->read_urb
);
331 cp2101_set_config_single(port
, CP2101_UART
, UART_DISABLE
);
336 * Reads the baud rate, data bits, parity, stop bits and flow control mode
337 * from the device, corrects any unsupported values, and configures the
338 * termios structure to reflect the state of the device
340 static void cp2101_get_termios (struct usb_serial_port
*port
)
342 unsigned int cflag
, modem_ctl
[4];
346 dbg("%s - port %d", __FUNCTION__
, port
->number
);
348 if ((!port
->tty
) || (!port
->tty
->termios
)) {
349 dbg("%s - no tty structures", __FUNCTION__
);
352 cflag
= port
->tty
->termios
->c_cflag
;
354 cp2101_get_config(port
, CP2101_BAUDRATE
, &baud
, 2);
355 /* Convert to baudrate */
357 baud
= BAUD_RATE_GEN_FREQ
/ baud
;
359 dbg("%s - baud rate = %d", __FUNCTION__
, baud
);
363 * The baud rates which are commented out below
364 * appear to be supported by the device
365 * but are non-standard
367 case 600: cflag
|= B600
; break;
368 case 1200: cflag
|= B1200
; break;
369 case 1800: cflag
|= B1800
; break;
370 case 2400: cflag
|= B2400
; break;
371 case 4800: cflag
|= B4800
; break;
372 /*case 7200: cflag |= B7200; break;*/
373 case 9600: cflag
|= B9600
; break;
374 /*case 14400: cflag |= B14400; break;*/
375 case 19200: cflag
|= B19200
; break;
376 /*case 28800: cflag |= B28800; break;*/
377 case 38400: cflag
|= B38400
; break;
378 /*case 55854: cflag |= B55054; break;*/
379 case 57600: cflag
|= B57600
; break;
380 case 115200: cflag
|= B115200
; break;
381 /*case 127117: cflag |= B127117; break;*/
382 case 230400: cflag
|= B230400
; break;
383 case 460800: cflag
|= B460800
; break;
384 case 921600: cflag
|= B921600
; break;
385 /*case 3686400: cflag |= B3686400; break;*/
387 dbg("%s - Baud rate is not supported, "
388 "using 9600 baud", __FUNCTION__
);
390 cp2101_set_config_single(port
, CP2101_BAUDRATE
,
391 (BAUD_RATE_GEN_FREQ
/9600));
395 cp2101_get_config(port
, CP2101_BITS
, &bits
, 2);
397 switch(bits
& BITS_DATA_MASK
) {
399 dbg("%s - data bits = 5", __FUNCTION__
);
403 dbg("%s - data bits = 6", __FUNCTION__
);
407 dbg("%s - data bits = 7", __FUNCTION__
);
411 dbg("%s - data bits = 8", __FUNCTION__
);
415 dbg("%s - data bits = 9 (not supported, "
416 "using 8 data bits)", __FUNCTION__
);
418 bits
&= ~BITS_DATA_MASK
;
420 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
423 dbg("%s - Unknown number of data bits, "
424 "using 8", __FUNCTION__
);
426 bits
&= ~BITS_DATA_MASK
;
428 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
432 switch(bits
& BITS_PARITY_MASK
) {
433 case BITS_PARITY_NONE
:
434 dbg("%s - parity = NONE", __FUNCTION__
);
437 case BITS_PARITY_ODD
:
438 dbg("%s - parity = ODD", __FUNCTION__
);
439 cflag
|= (PARENB
|PARODD
);
441 case BITS_PARITY_EVEN
:
442 dbg("%s - parity = EVEN", __FUNCTION__
);
446 case BITS_PARITY_MARK
:
447 dbg("%s - parity = MARK (not supported, "
448 "disabling parity)", __FUNCTION__
);
450 bits
&= ~BITS_PARITY_MASK
;
451 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
453 case BITS_PARITY_SPACE
:
454 dbg("%s - parity = SPACE (not supported, "
455 "disabling parity)", __FUNCTION__
);
457 bits
&= ~BITS_PARITY_MASK
;
458 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
461 dbg("%s - Unknown parity mode, "
462 "disabling parity", __FUNCTION__
);
464 bits
&= ~BITS_PARITY_MASK
;
465 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
470 switch(bits
& BITS_STOP_MASK
) {
472 dbg("%s - stop bits = 1", __FUNCTION__
);
475 dbg("%s - stop bits = 1.5 (not supported, "
476 "using 1 stop bit)", __FUNCTION__
);
477 bits
&= ~BITS_STOP_MASK
;
478 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
481 dbg("%s - stop bits = 2", __FUNCTION__
);
485 dbg("%s - Unknown number of stop bits, "
486 "using 1 stop bit", __FUNCTION__
);
487 bits
&= ~BITS_STOP_MASK
;
488 cp2101_set_config(port
, CP2101_BITS
, &bits
, 2);
492 cp2101_get_config(port
, CP2101_MODEMCTL
, modem_ctl
, 16);
493 if (modem_ctl
[0] & 0x0008) {
494 dbg("%s - flow control = CRTSCTS", __FUNCTION__
);
497 dbg("%s - flow control = NONE", __FUNCTION__
);
501 port
->tty
->termios
->c_cflag
= cflag
;
504 static void cp2101_set_termios (struct usb_serial_port
*port
,
505 struct termios
*old_termios
)
507 unsigned int cflag
, old_cflag
=0;
509 unsigned int modem_ctl
[4];
511 dbg("%s - port %d", __FUNCTION__
, port
->number
);
513 if ((!port
->tty
) || (!port
->tty
->termios
)) {
514 dbg("%s - no tty structures", __FUNCTION__
);
517 cflag
= port
->tty
->termios
->c_cflag
;
519 /* Check that they really want us to change something */
521 if ((cflag
== old_termios
->c_cflag
) &&
522 (RELEVANT_IFLAG(port
->tty
->termios
->c_iflag
)
523 == RELEVANT_IFLAG(old_termios
->c_iflag
))) {
524 dbg("%s - nothing to change...", __FUNCTION__
);
528 old_cflag
= old_termios
->c_cflag
;
531 /* If the baud rate is to be updated*/
532 if ((cflag
& CBAUD
) != (old_cflag
& CBAUD
)) {
533 switch (cflag
& CBAUD
) {
535 * The baud rates which are commented out below
536 * appear to be supported by the device
537 * but are non-standard
539 case B0
: baud
= 0; break;
540 case B600
: baud
= 600; break;
541 case B1200
: baud
= 1200; break;
542 case B1800
: baud
= 1800; break;
543 case B2400
: baud
= 2400; break;
544 case B4800
: baud
= 4800; break;
545 /*case B7200: baud = 7200; break;*/
546 case B9600
: baud
= 9600; break;
547 /*ase B14400: baud = 14400; break;*/
548 case B19200
: baud
= 19200; break;
549 /*case B28800: baud = 28800; break;*/
550 case B38400
: baud
= 38400; break;
551 /*case B55854: baud = 55054; break;*/
552 case B57600
: baud
= 57600; break;
553 case B115200
: baud
= 115200; break;
554 /*case B127117: baud = 127117; break;*/
555 case B230400
: baud
= 230400; break;
556 case B460800
: baud
= 460800; break;
557 case B921600
: baud
= 921600; break;
558 /*case B3686400: baud = 3686400; break;*/
560 dev_err(&port
->dev
, "cp2101 driver does not "
561 "support the baudrate requested\n");
566 dbg("%s - Setting baud rate to %d baud", __FUNCTION__
,
568 if (cp2101_set_config_single(port
, CP2101_BAUDRATE
,
569 (BAUD_RATE_GEN_FREQ
/ baud
)))
570 dev_err(&port
->dev
, "Baud rate requested not "
571 "supported by device\n");
575 /* If the number of data bits is to be updated */
576 if ((cflag
& CSIZE
) != (old_cflag
& CSIZE
)) {
577 cp2101_get_config(port
, CP2101_BITS
, &bits
, 2);
578 bits
&= ~BITS_DATA_MASK
;
579 switch (cflag
& CSIZE
) {
582 dbg("%s - data bits = 5", __FUNCTION__
);
586 dbg("%s - data bits = 6", __FUNCTION__
);
590 dbg("%s - data bits = 7", __FUNCTION__
);
594 dbg("%s - data bits = 8", __FUNCTION__
);
598 dbg("%s - data bits = 9", __FUNCTION__);
601 dev_err(&port
->dev
, "cp2101 driver does not "
602 "support the number of bits requested,"
603 " using 8 bit mode\n");
607 if (cp2101_set_config(port
, CP2101_BITS
, &bits
, 2))
608 dev_err(&port
->dev
, "Number of data bits requested "
609 "not supported by device\n");
612 if ((cflag
& (PARENB
|PARODD
)) != (old_cflag
& (PARENB
|PARODD
))) {
613 cp2101_get_config(port
, CP2101_BITS
, &bits
, 2);
614 bits
&= ~BITS_PARITY_MASK
;
615 if (cflag
& PARENB
) {
616 if (cflag
& PARODD
) {
617 bits
|= BITS_PARITY_ODD
;
618 dbg("%s - parity = ODD", __FUNCTION__
);
620 bits
|= BITS_PARITY_EVEN
;
621 dbg("%s - parity = EVEN", __FUNCTION__
);
624 if (cp2101_set_config(port
, CP2101_BITS
, &bits
, 2))
625 dev_err(&port
->dev
, "Parity mode not supported "
629 if ((cflag
& CSTOPB
) != (old_cflag
& CSTOPB
)) {
630 cp2101_get_config(port
, CP2101_BITS
, &bits
, 2);
631 bits
&= ~BITS_STOP_MASK
;
632 if (cflag
& CSTOPB
) {
634 dbg("%s - stop bits = 2", __FUNCTION__
);
637 dbg("%s - stop bits = 1", __FUNCTION__
);
639 if (cp2101_set_config(port
, CP2101_BITS
, &bits
, 2))
640 dev_err(&port
->dev
, "Number of stop bits requested "
641 "not supported by device\n");
644 if ((cflag
& CRTSCTS
) != (old_cflag
& CRTSCTS
)) {
645 cp2101_get_config(port
, CP2101_MODEMCTL
, modem_ctl
, 16);
646 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
647 __FUNCTION__
, modem_ctl
[0], modem_ctl
[1],
648 modem_ctl
[2], modem_ctl
[3]);
650 if (cflag
& CRTSCTS
) {
651 modem_ctl
[0] &= ~0x7B;
652 modem_ctl
[0] |= 0x09;
654 dbg("%s - flow control = CRTSCTS", __FUNCTION__
);
656 modem_ctl
[0] &= ~0x7B;
657 modem_ctl
[0] |= 0x01;
658 modem_ctl
[1] |= 0x40;
659 dbg("%s - flow control = NONE", __FUNCTION__
);
662 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
663 __FUNCTION__
, modem_ctl
[0], modem_ctl
[1],
664 modem_ctl
[2], modem_ctl
[3]);
665 cp2101_set_config(port
, CP2101_MODEMCTL
, modem_ctl
, 16);
670 static int cp2101_tiocmset (struct usb_serial_port
*port
, struct file
*file
,
671 unsigned int set
, unsigned int clear
)
675 dbg("%s - port %d", __FUNCTION__
, port
->number
);
677 if (set
& TIOCM_RTS
) {
678 control
|= CONTROL_RTS
;
679 control
|= CONTROL_WRITE_RTS
;
681 if (set
& TIOCM_DTR
) {
682 control
|= CONTROL_DTR
;
683 control
|= CONTROL_WRITE_DTR
;
685 if (clear
& TIOCM_RTS
) {
686 control
&= ~CONTROL_RTS
;
687 control
|= CONTROL_WRITE_RTS
;
689 if (clear
& TIOCM_DTR
) {
690 control
&= ~CONTROL_DTR
;
691 control
|= CONTROL_WRITE_DTR
;
694 dbg("%s - control = 0x%.4x", __FUNCTION__
, control
);
696 return cp2101_set_config(port
, CP2101_CONTROL
, &control
, 2);
700 static int cp2101_tiocmget (struct usb_serial_port
*port
, struct file
*file
)
704 dbg("%s - port %d", __FUNCTION__
, port
->number
);
706 cp2101_get_config(port
, CP2101_CONTROL
, &control
, 1);
708 result
= ((control
& CONTROL_DTR
) ? TIOCM_DTR
: 0)
709 |((control
& CONTROL_RTS
) ? TIOCM_RTS
: 0)
710 |((control
& CONTROL_CTS
) ? TIOCM_CTS
: 0)
711 |((control
& CONTROL_DSR
) ? TIOCM_DSR
: 0)
712 |((control
& CONTROL_RING
)? TIOCM_RI
: 0)
713 |((control
& CONTROL_DCD
) ? TIOCM_CD
: 0);
715 dbg("%s - control = 0x%.2x", __FUNCTION__
, control
);
720 static void cp2101_break_ctl (struct usb_serial_port
*port
, int break_state
)
724 dbg("%s - port %d", __FUNCTION__
, port
->number
);
725 if (break_state
== 0)
729 dbg("%s - turning break %s", __FUNCTION__
,
730 state
==BREAK_OFF
? "off" : "on");
731 cp2101_set_config(port
, CP2101_BREAK
, &state
, 2);
734 static int cp2101_startup (struct usb_serial
*serial
)
736 /* CP2101 buffers behave strangely unless device is reset */
737 usb_reset_device(serial
->dev
);
741 static void cp2101_shutdown (struct usb_serial
*serial
)
745 dbg("%s", __FUNCTION__
);
747 /* Stop reads and writes on all ports */
748 for (i
=0; i
< serial
->num_ports
; ++i
) {
749 cp2101_cleanup(serial
->port
[i
]);
753 static int __init
cp2101_init (void)
757 retval
= usb_serial_register(&cp2101_device
);
759 return retval
; /* Failed to register */
761 retval
= usb_register(&cp2101_driver
);
763 /* Failed to register */
764 usb_serial_deregister(&cp2101_device
);
769 info(DRIVER_DESC
" " DRIVER_VERSION
);
773 static void __exit
cp2101_exit (void)
775 usb_deregister (&cp2101_driver
);
776 usb_serial_deregister (&cp2101_device
);
779 module_init(cp2101_init
);
780 module_exit(cp2101_exit
);
782 MODULE_DESCRIPTION(DRIVER_DESC
);
783 MODULE_VERSION(DRIVER_VERSION
);
784 MODULE_LICENSE("GPL");
786 module_param(debug
, bool, S_IRUGO
| S_IWUSR
);
787 MODULE_PARM_DESC(debug
, "Enable verbose debugging messages");