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 <linux/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 ktermios*);
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, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
68 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
69 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
70 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
71 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
72 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
73 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
74 { } /* Terminating Entry */
77 MODULE_DEVICE_TABLE (usb, id_table);
79 static struct usb_driver cp2101_driver = {
81 .probe = usb_serial_probe,
82 .disconnect = usb_serial_disconnect,
87 static struct usb_serial_driver cp2101_device = {
93 .num_interrupt_in = 0,
98 .close = cp2101_close,
99 .break_ctl = cp2101_break_ctl,
100 .set_termios = cp2101_set_termios,
101 .tiocmget = cp2101_tiocmget,
102 .tiocmset = cp2101_tiocmset,
103 .attach = cp2101_startup,
104 .shutdown = cp2101_shutdown,
107 /* Config request types */
108 #define REQTYPE_HOST_TO_DEVICE 0x41
109 #define REQTYPE_DEVICE_TO_HOST 0xc1
111 /* Config SET requests. To GET, add 1 to the request number */
112 #define CP2101_UART 0x00 /* Enable / Disable */
113 #define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
114 #define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
115 #define CP2101_BREAK 0x05 /* On / Off */
116 #define CP2101_CONTROL 0x07 /* Flow control line states */
117 #define CP2101_MODEMCTL 0x13 /* Modem controls */
118 #define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
121 #define UART_ENABLE 0x0001
122 #define UART_DISABLE 0x0000
124 /* CP2101_BAUDRATE */
125 #define BAUD_RATE_GEN_FREQ 0x384000
128 #define BITS_DATA_MASK 0X0f00
129 #define BITS_DATA_5 0X0500
130 #define BITS_DATA_6 0X0600
131 #define BITS_DATA_7 0X0700
132 #define BITS_DATA_8 0X0800
133 #define BITS_DATA_9 0X0900
135 #define BITS_PARITY_MASK 0x00f0
136 #define BITS_PARITY_NONE 0x0000
137 #define BITS_PARITY_ODD 0x0010
138 #define BITS_PARITY_EVEN 0x0020
139 #define BITS_PARITY_MARK 0x0030
140 #define BITS_PARITY_SPACE 0x0040
142 #define BITS_STOP_MASK 0x000f
143 #define BITS_STOP_1 0x0000
144 #define BITS_STOP_1_5 0x0001
145 #define BITS_STOP_2 0x0002
148 #define BREAK_ON 0x0000
149 #define BREAK_OFF 0x0001
152 #define CONTROL_DTR 0x0001
153 #define CONTROL_RTS 0x0002
154 #define CONTROL_CTS 0x0010
155 #define CONTROL_DSR 0x0020
156 #define CONTROL_RING 0x0040
157 #define CONTROL_DCD 0x0080
158 #define CONTROL_WRITE_DTR 0x0100
159 #define CONTROL_WRITE_RTS 0x0200
163 * Reads from the CP2101 configuration registers
164 * 'size' is specified in bytes.
165 * 'data' is a pointer to a pre-allocated array of integers large
166 * enough to hold 'size' bytes (with 4 bytes to each integer)
168 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
169 unsigned int *data, int size)
171 struct usb_serial *serial = port->serial;
173 int result, i, length;
175 /* Number of integers required to contain the array */
176 length = (((size - 1) | 3) + 1)/4;
178 buf = kcalloc(length, sizeof(u32), GFP_KERNEL);
180 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
184 /* For get requests, the request number must be incremented */
187 /* Issue the request, attempting to read 'size' bytes */
188 result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
189 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
192 /* Convert data into an array of integers */
193 for (i=0; i<length; i++)
194 data[i] = le32_to_cpu(buf[i]);
198 if (result != size) {
199 dev_err(&port->dev, "%s - Unable to send config request, "
200 "request=0x%x size=%d result=%d\n",
201 __FUNCTION__, request, size, result);
210 * Writes to the CP2101 configuration registers
211 * Values less than 16 bits wide are sent directly
212 * 'size' is specified in bytes.
214 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
215 unsigned int *data, int size)
217 struct usb_serial *serial = port->serial;
219 int result, i, length;
221 /* Number of integers required to contain the array */
222 length = (((size - 1) | 3) + 1)/4;
224 buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
226 dev_err(&port->dev, "%s - out of memory.\n",
231 /* Array of integers into bytes */
232 for (i = 0; i < length; i++)
233 buf[i] = cpu_to_le32(data[i]);
236 result = usb_control_msg (serial->dev,
237 usb_sndctrlpipe(serial->dev, 0),
238 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
241 result = usb_control_msg (serial->dev,
242 usb_sndctrlpipe(serial->dev, 0),
243 request, REQTYPE_HOST_TO_DEVICE, data[0],
249 if ((size > 2 && result != size) || result < 0) {
250 dev_err(&port->dev, "%s - Unable to send request, "
251 "request=0x%x size=%d result=%d\n",
252 __FUNCTION__, request, size, result);
256 /* Single data value */
257 result = usb_control_msg (serial->dev,
258 usb_sndctrlpipe(serial->dev, 0),
259 request, REQTYPE_HOST_TO_DEVICE, data[0],
265 * cp2101_set_config_single
266 * Convenience function for calling cp2101_set_config on single data values
267 * without requiring an integer pointer
269 static inline int cp2101_set_config_single(struct usb_serial_port* port,
270 u8 request, unsigned int data)
272 return cp2101_set_config(port, request, &data, 2);
275 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
277 struct usb_serial *serial = port->serial;
280 dbg("%s - port %d", __FUNCTION__, port->number);
282 if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
283 dev_err(&port->dev, "%s - Unable to enable UART\n",
288 /* Start reading from the device */
289 usb_fill_bulk_urb (port->read_urb, serial->dev,
290 usb_rcvbulkpipe(serial->dev,
291 port->bulk_in_endpointAddress),
292 port->read_urb->transfer_buffer,
293 port->read_urb->transfer_buffer_length,
294 serial->type->read_bulk_callback,
296 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
298 dev_err(&port->dev, "%s - failed resubmitting read urb, "
299 "error %d\n", __FUNCTION__, result);
303 /* Configure the termios structure */
304 cp2101_get_termios(port);
306 /* Set the DTR and RTS pins low */
307 cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
312 static void cp2101_cleanup (struct usb_serial_port *port)
314 struct usb_serial *serial = port->serial;
316 dbg("%s - port %d", __FUNCTION__, port->number);
319 /* shutdown any bulk reads that might be going on */
320 if (serial->num_bulk_out)
321 usb_kill_urb(port->write_urb);
322 if (serial->num_bulk_in)
323 usb_kill_urb(port->read_urb);
327 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
329 dbg("%s - port %d", __FUNCTION__, port->number);
331 /* shutdown our urbs */
332 dbg("%s - shutting down urbs", __FUNCTION__);
333 usb_kill_urb(port->write_urb);
334 usb_kill_urb(port->read_urb);
336 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
341 * Reads the baud rate, data bits, parity, stop bits and flow control mode
342 * from the device, corrects any unsupported values, and configures the
343 * termios structure to reflect the state of the device
345 static void cp2101_get_termios (struct usb_serial_port *port)
347 unsigned int cflag, modem_ctl[4];
351 dbg("%s - port %d", __FUNCTION__, port->number);
353 if ((!port->tty) || (!port->tty->termios)) {
354 dbg("%s - no tty structures", __FUNCTION__);
357 cflag = port->tty->termios->c_cflag;
359 cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
360 /* Convert to baudrate */
362 baud = BAUD_RATE_GEN_FREQ / baud;
364 dbg("%s - baud rate = %d", __FUNCTION__, baud);
368 * The baud rates which are commented out below
369 * appear to be supported by the device
370 * but are non-standard
372 case 600: cflag |= B600; break;
373 case 1200: cflag |= B1200; break;
374 case 1800: cflag |= B1800; break;
375 case 2400: cflag |= B2400; break;
376 case 4800: cflag |= B4800; break;
377 /*case 7200: cflag |= B7200; break;*/
378 case 9600: cflag |= B9600; break;
379 /*case 14400: cflag |= B14400; break;*/
380 case 19200: cflag |= B19200; break;
381 /*case 28800: cflag |= B28800; break;*/
382 case 38400: cflag |= B38400; break;
383 /*case 55854: cflag |= B55054; break;*/
384 case 57600: cflag |= B57600; break;
385 case 115200: cflag |= B115200; break;
386 /*case 127117: cflag |= B127117; break;*/
387 case 230400: cflag |= B230400; break;
388 case 460800: cflag |= B460800; break;
389 case 921600: cflag |= B921600; break;
390 /*case 3686400: cflag |= B3686400; break;*/
392 dbg("%s - Baud rate is not supported, "
393 "using 9600 baud", __FUNCTION__);
395 cp2101_set_config_single(port, CP2101_BAUDRATE,
396 (BAUD_RATE_GEN_FREQ/9600));
400 cp2101_get_config(port, CP2101_BITS, &bits, 2);
402 switch(bits & BITS_DATA_MASK) {
404 dbg("%s - data bits = 5", __FUNCTION__);
408 dbg("%s - data bits = 6", __FUNCTION__);
412 dbg("%s - data bits = 7", __FUNCTION__);
416 dbg("%s - data bits = 8", __FUNCTION__);
420 dbg("%s - data bits = 9 (not supported, "
421 "using 8 data bits)", __FUNCTION__);
423 bits &= ~BITS_DATA_MASK;
425 cp2101_set_config(port, CP2101_BITS, &bits, 2);
428 dbg("%s - Unknown number of data bits, "
429 "using 8", __FUNCTION__);
431 bits &= ~BITS_DATA_MASK;
433 cp2101_set_config(port, CP2101_BITS, &bits, 2);
437 switch(bits & BITS_PARITY_MASK) {
438 case BITS_PARITY_NONE:
439 dbg("%s - parity = NONE", __FUNCTION__);
442 case BITS_PARITY_ODD:
443 dbg("%s - parity = ODD", __FUNCTION__);
444 cflag |= (PARENB|PARODD);
446 case BITS_PARITY_EVEN:
447 dbg("%s - parity = EVEN", __FUNCTION__);
451 case BITS_PARITY_MARK:
452 dbg("%s - parity = MARK (not supported, "
453 "disabling parity)", __FUNCTION__);
455 bits &= ~BITS_PARITY_MASK;
456 cp2101_set_config(port, CP2101_BITS, &bits, 2);
458 case BITS_PARITY_SPACE:
459 dbg("%s - parity = SPACE (not supported, "
460 "disabling parity)", __FUNCTION__);
462 bits &= ~BITS_PARITY_MASK;
463 cp2101_set_config(port, CP2101_BITS, &bits, 2);
466 dbg("%s - Unknown parity mode, "
467 "disabling parity", __FUNCTION__);
469 bits &= ~BITS_PARITY_MASK;
470 cp2101_set_config(port, CP2101_BITS, &bits, 2);
475 switch(bits & BITS_STOP_MASK) {
477 dbg("%s - stop bits = 1", __FUNCTION__);
480 dbg("%s - stop bits = 1.5 (not supported, "
481 "using 1 stop bit)", __FUNCTION__);
482 bits &= ~BITS_STOP_MASK;
483 cp2101_set_config(port, CP2101_BITS, &bits, 2);
486 dbg("%s - stop bits = 2", __FUNCTION__);
490 dbg("%s - Unknown number of stop bits, "
491 "using 1 stop bit", __FUNCTION__);
492 bits &= ~BITS_STOP_MASK;
493 cp2101_set_config(port, CP2101_BITS, &bits, 2);
497 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
498 if (modem_ctl[0] & 0x0008) {
499 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
502 dbg("%s - flow control = NONE", __FUNCTION__);
506 port->tty->termios->c_cflag = cflag;
509 static void cp2101_set_termios (struct usb_serial_port *port,
510 struct ktermios *old_termios)
512 unsigned int cflag, old_cflag=0;
514 unsigned int modem_ctl[4];
516 dbg("%s - port %d", __FUNCTION__, port->number);
518 if ((!port->tty) || (!port->tty->termios)) {
519 dbg("%s - no tty structures", __FUNCTION__);
522 cflag = port->tty->termios->c_cflag;
524 /* Check that they really want us to change something */
526 if ((cflag == old_termios->c_cflag) &&
527 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
528 == RELEVANT_IFLAG(old_termios->c_iflag))) {
529 dbg("%s - nothing to change...", __FUNCTION__);
533 old_cflag = old_termios->c_cflag;
536 /* If the baud rate is to be updated*/
537 if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
538 switch (cflag & CBAUD) {
540 * The baud rates which are commented out below
541 * appear to be supported by the device
542 * but are non-standard
544 case B0: baud = 0; break;
545 case B600: baud = 600; break;
546 case B1200: baud = 1200; break;
547 case B1800: baud = 1800; break;
548 case B2400: baud = 2400; break;
549 case B4800: baud = 4800; break;
550 /*case B7200: baud = 7200; break;*/
551 case B9600: baud = 9600; break;
552 /*ase B14400: baud = 14400; break;*/
553 case B19200: baud = 19200; break;
554 /*case B28800: baud = 28800; break;*/
555 case B38400: baud = 38400; break;
556 /*case B55854: baud = 55054; break;*/
557 case B57600: baud = 57600; break;
558 case B115200: baud = 115200; break;
559 /*case B127117: baud = 127117; break;*/
560 case B230400: baud = 230400; break;
561 case B460800: baud = 460800; break;
562 case B921600: baud = 921600; break;
563 /*case B3686400: baud = 3686400; break;*/
565 dev_err(&port->dev, "cp2101 driver does not "
566 "support the baudrate requested\n");
571 dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
573 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
574 (BAUD_RATE_GEN_FREQ / baud)))
575 dev_err(&port->dev, "Baud rate requested not "
576 "supported by device\n");
580 /* If the number of data bits is to be updated */
581 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
582 cp2101_get_config(port, CP2101_BITS, &bits, 2);
583 bits &= ~BITS_DATA_MASK;
584 switch (cflag & CSIZE) {
587 dbg("%s - data bits = 5", __FUNCTION__);
591 dbg("%s - data bits = 6", __FUNCTION__);
595 dbg("%s - data bits = 7", __FUNCTION__);
599 dbg("%s - data bits = 8", __FUNCTION__);
603 dbg("%s - data bits = 9", __FUNCTION__);
606 dev_err(&port->dev, "cp2101 driver does not "
607 "support the number of bits requested,"
608 " using 8 bit mode\n");
612 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
613 dev_err(&port->dev, "Number of data bits requested "
614 "not supported by device\n");
617 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
618 cp2101_get_config(port, CP2101_BITS, &bits, 2);
619 bits &= ~BITS_PARITY_MASK;
620 if (cflag & PARENB) {
621 if (cflag & PARODD) {
622 bits |= BITS_PARITY_ODD;
623 dbg("%s - parity = ODD", __FUNCTION__);
625 bits |= BITS_PARITY_EVEN;
626 dbg("%s - parity = EVEN", __FUNCTION__);
629 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
630 dev_err(&port->dev, "Parity mode not supported "
634 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
635 cp2101_get_config(port, CP2101_BITS, &bits, 2);
636 bits &= ~BITS_STOP_MASK;
637 if (cflag & CSTOPB) {
639 dbg("%s - stop bits = 2", __FUNCTION__);
642 dbg("%s - stop bits = 1", __FUNCTION__);
644 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
645 dev_err(&port->dev, "Number of stop bits requested "
646 "not supported by device\n");
649 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
650 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
651 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
652 __FUNCTION__, modem_ctl[0], modem_ctl[1],
653 modem_ctl[2], modem_ctl[3]);
655 if (cflag & CRTSCTS) {
656 modem_ctl[0] &= ~0x7B;
657 modem_ctl[0] |= 0x09;
659 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
661 modem_ctl[0] &= ~0x7B;
662 modem_ctl[0] |= 0x01;
663 modem_ctl[1] |= 0x40;
664 dbg("%s - flow control = NONE", __FUNCTION__);
667 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
668 __FUNCTION__, modem_ctl[0], modem_ctl[1],
669 modem_ctl[2], modem_ctl[3]);
670 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
675 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
676 unsigned int set, unsigned int clear)
680 dbg("%s - port %d", __FUNCTION__, port->number);
682 if (set & TIOCM_RTS) {
683 control |= CONTROL_RTS;
684 control |= CONTROL_WRITE_RTS;
686 if (set & TIOCM_DTR) {
687 control |= CONTROL_DTR;
688 control |= CONTROL_WRITE_DTR;
690 if (clear & TIOCM_RTS) {
691 control &= ~CONTROL_RTS;
692 control |= CONTROL_WRITE_RTS;
694 if (clear & TIOCM_DTR) {
695 control &= ~CONTROL_DTR;
696 control |= CONTROL_WRITE_DTR;
699 dbg("%s - control = 0x%.4x", __FUNCTION__, control);
701 return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
705 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
709 dbg("%s - port %d", __FUNCTION__, port->number);
711 cp2101_get_config(port, CP2101_CONTROL, &control, 1);
713 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
714 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
715 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
716 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
717 |((control & CONTROL_RING)? TIOCM_RI : 0)
718 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
720 dbg("%s - control = 0x%.2x", __FUNCTION__, control);
725 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
729 dbg("%s - port %d", __FUNCTION__, port->number);
730 if (break_state == 0)
734 dbg("%s - turning break %s", __FUNCTION__,
735 state==BREAK_OFF ? "off" : "on");
736 cp2101_set_config(port, CP2101_BREAK, &state, 2);
739 static int cp2101_startup (struct usb_serial *serial)
741 /* CP2101 buffers behave strangely unless device is reset */
742 usb_reset_device(serial->dev);
746 static void cp2101_shutdown (struct usb_serial *serial)
750 dbg("%s", __FUNCTION__);
752 /* Stop reads and writes on all ports */
753 for (i=0; i < serial->num_ports; ++i) {
754 cp2101_cleanup(serial->port[i]);
758 static int __init cp2101_init (void)
762 retval = usb_serial_register(&cp2101_device);
764 return retval; /* Failed to register */
766 retval = usb_register(&cp2101_driver);
768 /* Failed to register */
769 usb_serial_deregister(&cp2101_device);
774 info(DRIVER_DESC " " DRIVER_VERSION);
778 static void __exit cp2101_exit (void)
780 usb_deregister (&cp2101_driver);
781 usb_serial_deregister (&cp2101_device);
784 module_init(cp2101_init);
785 module_exit(cp2101_exit);
787 MODULE_DESCRIPTION(DRIVER_DESC);
788 MODULE_VERSION(DRIVER_VERSION);
789 MODULE_LICENSE("GPL");
791 module_param(debug, bool, S_IRUGO | S_IWUSR);
792 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");