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 <linux/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 tty_struct *, struct usb_serial_port *,
42 static void cp2101_cleanup(struct usb_serial_port *);
43 static void cp2101_close(struct tty_struct *, struct usb_serial_port *,
45 static void cp2101_get_termios(struct tty_struct *);
46 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
48 static int cp2101_tiocmget(struct tty_struct *, struct file *);
49 static int cp2101_tiocmset(struct tty_struct *, struct file *,
50 unsigned int, unsigned int);
51 static void cp2101_break_ctl(struct tty_struct *, int);
52 static int cp2101_startup(struct usb_serial *);
53 static void cp2101_shutdown(struct usb_serial *);
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(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
62 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
63 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
64 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
65 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
66 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
67 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
68 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
69 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
70 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
71 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
72 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
73 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
74 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
75 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
76 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
77 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
78 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
79 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
80 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
81 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
82 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
83 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
84 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
85 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
86 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
87 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
88 { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
89 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
90 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
91 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
92 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
93 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
94 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
95 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
96 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
97 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
98 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
99 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
100 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
101 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
102 { } /* Terminating Entry */
105 MODULE_DEVICE_TABLE(usb, id_table);
107 static struct usb_driver cp2101_driver = {
109 .probe = usb_serial_probe,
110 .disconnect = usb_serial_disconnect,
111 .id_table = id_table,
115 static struct usb_serial_driver cp2101_device = {
117 .owner = THIS_MODULE,
120 .usb_driver = &cp2101_driver,
121 .id_table = id_table,
124 .close = cp2101_close,
125 .break_ctl = cp2101_break_ctl,
126 .set_termios = cp2101_set_termios,
127 .tiocmget = cp2101_tiocmget,
128 .tiocmset = cp2101_tiocmset,
129 .attach = cp2101_startup,
130 .shutdown = cp2101_shutdown,
133 /* Config request types */
134 #define REQTYPE_HOST_TO_DEVICE 0x41
135 #define REQTYPE_DEVICE_TO_HOST 0xc1
137 /* Config SET requests. To GET, add 1 to the request number */
138 #define CP2101_UART 0x00 /* Enable / Disable */
139 #define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
140 #define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
141 #define CP2101_BREAK 0x05 /* On / Off */
142 #define CP2101_CONTROL 0x07 /* Flow control line states */
143 #define CP2101_MODEMCTL 0x13 /* Modem controls */
144 #define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
147 #define UART_ENABLE 0x0001
148 #define UART_DISABLE 0x0000
150 /* CP2101_BAUDRATE */
151 #define BAUD_RATE_GEN_FREQ 0x384000
154 #define BITS_DATA_MASK 0X0f00
155 #define BITS_DATA_5 0X0500
156 #define BITS_DATA_6 0X0600
157 #define BITS_DATA_7 0X0700
158 #define BITS_DATA_8 0X0800
159 #define BITS_DATA_9 0X0900
161 #define BITS_PARITY_MASK 0x00f0
162 #define BITS_PARITY_NONE 0x0000
163 #define BITS_PARITY_ODD 0x0010
164 #define BITS_PARITY_EVEN 0x0020
165 #define BITS_PARITY_MARK 0x0030
166 #define BITS_PARITY_SPACE 0x0040
168 #define BITS_STOP_MASK 0x000f
169 #define BITS_STOP_1 0x0000
170 #define BITS_STOP_1_5 0x0001
171 #define BITS_STOP_2 0x0002
174 #define BREAK_ON 0x0000
175 #define BREAK_OFF 0x0001
178 #define CONTROL_DTR 0x0001
179 #define CONTROL_RTS 0x0002
180 #define CONTROL_CTS 0x0010
181 #define CONTROL_DSR 0x0020
182 #define CONTROL_RING 0x0040
183 #define CONTROL_DCD 0x0080
184 #define CONTROL_WRITE_DTR 0x0100
185 #define CONTROL_WRITE_RTS 0x0200
189 * Reads from the CP2101 configuration registers
190 * 'size' is specified in bytes.
191 * 'data' is a pointer to a pre-allocated array of integers large
192 * enough to hold 'size' bytes (with 4 bytes to each integer)
194 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
195 unsigned int *data, int size)
197 struct usb_serial *serial = port->serial;
199 int result, i, length;
201 /* Number of integers required to contain the array */
202 length = (((size - 1) | 3) + 1)/4;
204 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
206 dev_err(&port->dev, "%s - out of memory.\n", __func__);
210 /* For get requests, the request number must be incremented */
213 /* Issue the request, attempting to read 'size' bytes */
214 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
215 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
218 /* Convert data into an array of integers */
219 for (i = 0; i < length; i++)
220 data[i] = le32_to_cpu(buf[i]);
224 if (result != size) {
225 dev_err(&port->dev, "%s - Unable to send config request, "
226 "request=0x%x size=%d result=%d\n",
227 __func__, request, size, result);
236 * Writes to the CP2101 configuration registers
237 * Values less than 16 bits wide are sent directly
238 * 'size' is specified in bytes.
240 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
241 unsigned int *data, int size)
243 struct usb_serial *serial = port->serial;
245 int result, i, length;
247 /* Number of integers required to contain the array */
248 length = (((size - 1) | 3) + 1)/4;
250 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
252 dev_err(&port->dev, "%s - out of memory.\n",
257 /* Array of integers into bytes */
258 for (i = 0; i < length; i++)
259 buf[i] = cpu_to_le32(data[i]);
262 result = usb_control_msg(serial->dev,
263 usb_sndctrlpipe(serial->dev, 0),
264 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
267 result = usb_control_msg(serial->dev,
268 usb_sndctrlpipe(serial->dev, 0),
269 request, REQTYPE_HOST_TO_DEVICE, data[0],
275 if ((size > 2 && result != size) || result < 0) {
276 dev_err(&port->dev, "%s - Unable to send request, "
277 "request=0x%x size=%d result=%d\n",
278 __func__, request, size, result);
282 /* Single data value */
283 result = usb_control_msg(serial->dev,
284 usb_sndctrlpipe(serial->dev, 0),
285 request, REQTYPE_HOST_TO_DEVICE, data[0],
291 * cp2101_set_config_single
292 * Convenience function for calling cp2101_set_config on single data values
293 * without requiring an integer pointer
295 static inline int cp2101_set_config_single(struct usb_serial_port *port,
296 u8 request, unsigned int data)
298 return cp2101_set_config(port, request, &data, 2);
301 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
304 struct usb_serial *serial = port->serial;
307 dbg("%s - port %d", __func__, port->number);
309 if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
310 dev_err(&port->dev, "%s - Unable to enable UART\n",
315 /* Start reading from the device */
316 usb_fill_bulk_urb(port->read_urb, serial->dev,
317 usb_rcvbulkpipe(serial->dev,
318 port->bulk_in_endpointAddress),
319 port->read_urb->transfer_buffer,
320 port->read_urb->transfer_buffer_length,
321 serial->type->read_bulk_callback,
323 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
325 dev_err(&port->dev, "%s - failed resubmitting read urb, "
326 "error %d\n", __func__, result);
330 /* Configure the termios structure */
331 cp2101_get_termios(tty);
333 /* Set the DTR and RTS pins low */
334 cp2101_tiocmset(tty, NULL, TIOCM_DTR | TIOCM_RTS, 0);
339 static void cp2101_cleanup(struct usb_serial_port *port)
341 struct usb_serial *serial = port->serial;
343 dbg("%s - port %d", __func__, port->number);
346 /* shutdown any bulk reads that might be going on */
347 if (serial->num_bulk_out)
348 usb_kill_urb(port->write_urb);
349 if (serial->num_bulk_in)
350 usb_kill_urb(port->read_urb);
354 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
357 dbg("%s - port %d", __func__, port->number);
359 /* shutdown our urbs */
360 dbg("%s - shutting down urbs", __func__);
361 usb_kill_urb(port->write_urb);
362 usb_kill_urb(port->read_urb);
364 mutex_lock(&port->serial->disc_mutex);
365 if (!port->serial->disconnected)
366 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
367 mutex_unlock(&port->serial->disc_mutex);
372 * Reads the baud rate, data bits, parity, stop bits and flow control mode
373 * from the device, corrects any unsupported values, and configures the
374 * termios structure to reflect the state of the device
376 static void cp2101_get_termios (struct tty_struct *tty)
378 struct usb_serial_port *port = tty->driver_data;
379 unsigned int cflag, modem_ctl[4];
383 dbg("%s - port %d", __func__, port->number);
385 cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
386 /* Convert to baudrate */
388 baud = BAUD_RATE_GEN_FREQ / baud;
390 dbg("%s - baud rate = %d", __func__, baud);
392 tty_encode_baud_rate(tty, baud, baud);
393 cflag = tty->termios->c_cflag;
395 cp2101_get_config(port, CP2101_BITS, &bits, 2);
397 switch (bits & BITS_DATA_MASK) {
399 dbg("%s - data bits = 5", __func__);
403 dbg("%s - data bits = 6", __func__);
407 dbg("%s - data bits = 7", __func__);
411 dbg("%s - data bits = 8", __func__);
415 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
418 bits &= ~BITS_DATA_MASK;
420 cp2101_set_config(port, CP2101_BITS, &bits, 2);
423 dbg("%s - Unknown number of data bits, using 8", __func__);
425 bits &= ~BITS_DATA_MASK;
427 cp2101_set_config(port, CP2101_BITS, &bits, 2);
431 switch (bits & BITS_PARITY_MASK) {
432 case BITS_PARITY_NONE:
433 dbg("%s - parity = NONE", __func__);
436 case BITS_PARITY_ODD:
437 dbg("%s - parity = ODD", __func__);
438 cflag |= (PARENB|PARODD);
440 case BITS_PARITY_EVEN:
441 dbg("%s - parity = EVEN", __func__);
445 case BITS_PARITY_MARK:
446 dbg("%s - parity = MARK (not supported, disabling parity)",
449 bits &= ~BITS_PARITY_MASK;
450 cp2101_set_config(port, CP2101_BITS, &bits, 2);
452 case BITS_PARITY_SPACE:
453 dbg("%s - parity = SPACE (not supported, disabling parity)",
456 bits &= ~BITS_PARITY_MASK;
457 cp2101_set_config(port, CP2101_BITS, &bits, 2);
460 dbg("%s - Unknown parity mode, disabling parity", __func__);
462 bits &= ~BITS_PARITY_MASK;
463 cp2101_set_config(port, CP2101_BITS, &bits, 2);
468 switch (bits & BITS_STOP_MASK) {
470 dbg("%s - stop bits = 1", __func__);
473 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
475 bits &= ~BITS_STOP_MASK;
476 cp2101_set_config(port, CP2101_BITS, &bits, 2);
479 dbg("%s - stop bits = 2", __func__);
483 dbg("%s - Unknown number of stop bits, using 1 stop bit",
485 bits &= ~BITS_STOP_MASK;
486 cp2101_set_config(port, CP2101_BITS, &bits, 2);
490 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
491 if (modem_ctl[0] & 0x0008) {
492 dbg("%s - flow control = CRTSCTS", __func__);
495 dbg("%s - flow control = NONE", __func__);
499 tty->termios->c_cflag = cflag;
502 static void cp2101_set_termios(struct tty_struct *tty,
503 struct usb_serial_port *port, struct ktermios *old_termios)
505 unsigned int cflag, old_cflag;
506 unsigned int baud = 0, bits;
507 unsigned int modem_ctl[4];
509 dbg("%s - port %d", __func__, port->number);
514 tty->termios->c_cflag &= ~CMSPAR;
515 cflag = tty->termios->c_cflag;
516 old_cflag = old_termios->c_cflag;
517 baud = tty_get_baud_rate(tty);
519 /* If the baud rate is to be updated*/
520 if (baud != tty_termios_baud_rate(old_termios)) {
549 dbg("%s - Setting baud rate to %d baud", __func__,
551 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
552 (BAUD_RATE_GEN_FREQ / baud))) {
553 dev_err(&port->dev, "Baud rate requested not "
554 "supported by device\n");
555 baud = tty_termios_baud_rate(old_termios);
559 /* Report back the resulting baud rate */
560 tty_encode_baud_rate(tty, baud, baud);
562 /* If the number of data bits is to be updated */
563 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
564 cp2101_get_config(port, CP2101_BITS, &bits, 2);
565 bits &= ~BITS_DATA_MASK;
566 switch (cflag & CSIZE) {
569 dbg("%s - data bits = 5", __func__);
573 dbg("%s - data bits = 6", __func__);
577 dbg("%s - data bits = 7", __func__);
581 dbg("%s - data bits = 8", __func__);
585 dbg("%s - data bits = 9", __func__);
588 dev_err(&port->dev, "cp2101 driver does not "
589 "support the number of bits requested,"
590 " using 8 bit mode\n");
594 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
595 dev_err(&port->dev, "Number of data bits requested "
596 "not supported by device\n");
599 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
600 cp2101_get_config(port, CP2101_BITS, &bits, 2);
601 bits &= ~BITS_PARITY_MASK;
602 if (cflag & PARENB) {
603 if (cflag & PARODD) {
604 bits |= BITS_PARITY_ODD;
605 dbg("%s - parity = ODD", __func__);
607 bits |= BITS_PARITY_EVEN;
608 dbg("%s - parity = EVEN", __func__);
611 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
612 dev_err(&port->dev, "Parity mode not supported "
616 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
617 cp2101_get_config(port, CP2101_BITS, &bits, 2);
618 bits &= ~BITS_STOP_MASK;
619 if (cflag & CSTOPB) {
621 dbg("%s - stop bits = 2", __func__);
624 dbg("%s - stop bits = 1", __func__);
626 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
627 dev_err(&port->dev, "Number of stop bits requested "
628 "not supported by device\n");
631 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
632 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
633 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
634 __func__, modem_ctl[0], modem_ctl[1],
635 modem_ctl[2], modem_ctl[3]);
637 if (cflag & CRTSCTS) {
638 modem_ctl[0] &= ~0x7B;
639 modem_ctl[0] |= 0x09;
641 dbg("%s - flow control = CRTSCTS", __func__);
643 modem_ctl[0] &= ~0x7B;
644 modem_ctl[0] |= 0x01;
645 modem_ctl[1] |= 0x40;
646 dbg("%s - flow control = NONE", __func__);
649 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
650 __func__, modem_ctl[0], modem_ctl[1],
651 modem_ctl[2], modem_ctl[3]);
652 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
657 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
658 unsigned int set, unsigned int clear)
660 struct usb_serial_port *port = tty->driver_data;
661 unsigned int control = 0;
663 dbg("%s - port %d", __func__, port->number);
665 if (set & TIOCM_RTS) {
666 control |= CONTROL_RTS;
667 control |= CONTROL_WRITE_RTS;
669 if (set & TIOCM_DTR) {
670 control |= CONTROL_DTR;
671 control |= CONTROL_WRITE_DTR;
673 if (clear & TIOCM_RTS) {
674 control &= ~CONTROL_RTS;
675 control |= CONTROL_WRITE_RTS;
677 if (clear & TIOCM_DTR) {
678 control &= ~CONTROL_DTR;
679 control |= CONTROL_WRITE_DTR;
682 dbg("%s - control = 0x%.4x", __func__, control);
684 return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
688 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
690 struct usb_serial_port *port = tty->driver_data;
691 unsigned int control;
694 dbg("%s - port %d", __func__, port->number);
696 cp2101_get_config(port, CP2101_CONTROL, &control, 1);
698 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
699 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
700 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
701 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
702 |((control & CONTROL_RING)? TIOCM_RI : 0)
703 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
705 dbg("%s - control = 0x%.2x", __func__, control);
710 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
712 struct usb_serial_port *port = tty->driver_data;
715 dbg("%s - port %d", __func__, port->number);
716 if (break_state == 0)
720 dbg("%s - turning break %s", __func__,
721 state == BREAK_OFF ? "off" : "on");
722 cp2101_set_config(port, CP2101_BREAK, &state, 2);
725 static int cp2101_startup(struct usb_serial *serial)
727 /* CP2101 buffers behave strangely unless device is reset */
728 usb_reset_device(serial->dev);
732 static void cp2101_shutdown(struct usb_serial *serial)
738 /* Stop reads and writes on all ports */
739 for (i = 0; i < serial->num_ports; ++i)
740 cp2101_cleanup(serial->port[i]);
743 static int __init cp2101_init(void)
747 retval = usb_serial_register(&cp2101_device);
749 return retval; /* Failed to register */
751 retval = usb_register(&cp2101_driver);
753 /* Failed to register */
754 usb_serial_deregister(&cp2101_device);
759 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
764 static void __exit cp2101_exit(void)
766 usb_deregister(&cp2101_driver);
767 usb_serial_deregister(&cp2101_device);
770 module_init(cp2101_init);
771 module_exit(cp2101_exit);
773 MODULE_DESCRIPTION(DRIVER_DESC);
774 MODULE_VERSION(DRIVER_VERSION);
775 MODULE_LICENSE("GPL");
777 module_param(debug, bool, S_IRUGO | S_IWUSR);
778 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");