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(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
61 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
62 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
63 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
64 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
65 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
66 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
67 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
68 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
69 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
70 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
71 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
72 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
73 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
74 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
75 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
76 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
77 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
78 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
79 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
80 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
81 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
82 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
83 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
84 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
85 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
86 { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
87 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
88 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
89 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
90 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
91 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
92 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
93 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
94 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
95 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
96 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
97 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
98 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
99 { } /* Terminating Entry */
102 MODULE_DEVICE_TABLE(usb, id_table);
104 static struct usb_driver cp2101_driver = {
106 .probe = usb_serial_probe,
107 .disconnect = usb_serial_disconnect,
108 .id_table = id_table,
112 static struct usb_serial_driver cp2101_device = {
114 .owner = THIS_MODULE,
117 .usb_driver = &cp2101_driver,
118 .id_table = id_table,
121 .close = cp2101_close,
122 .break_ctl = cp2101_break_ctl,
123 .set_termios = cp2101_set_termios,
124 .tiocmget = cp2101_tiocmget,
125 .tiocmset = cp2101_tiocmset,
126 .attach = cp2101_startup,
127 .shutdown = cp2101_shutdown,
130 /* Config request types */
131 #define REQTYPE_HOST_TO_DEVICE 0x41
132 #define REQTYPE_DEVICE_TO_HOST 0xc1
134 /* Config SET requests. To GET, add 1 to the request number */
135 #define CP2101_UART 0x00 /* Enable / Disable */
136 #define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
137 #define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
138 #define CP2101_BREAK 0x05 /* On / Off */
139 #define CP2101_CONTROL 0x07 /* Flow control line states */
140 #define CP2101_MODEMCTL 0x13 /* Modem controls */
141 #define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
144 #define UART_ENABLE 0x0001
145 #define UART_DISABLE 0x0000
147 /* CP2101_BAUDRATE */
148 #define BAUD_RATE_GEN_FREQ 0x384000
151 #define BITS_DATA_MASK 0X0f00
152 #define BITS_DATA_5 0X0500
153 #define BITS_DATA_6 0X0600
154 #define BITS_DATA_7 0X0700
155 #define BITS_DATA_8 0X0800
156 #define BITS_DATA_9 0X0900
158 #define BITS_PARITY_MASK 0x00f0
159 #define BITS_PARITY_NONE 0x0000
160 #define BITS_PARITY_ODD 0x0010
161 #define BITS_PARITY_EVEN 0x0020
162 #define BITS_PARITY_MARK 0x0030
163 #define BITS_PARITY_SPACE 0x0040
165 #define BITS_STOP_MASK 0x000f
166 #define BITS_STOP_1 0x0000
167 #define BITS_STOP_1_5 0x0001
168 #define BITS_STOP_2 0x0002
171 #define BREAK_ON 0x0000
172 #define BREAK_OFF 0x0001
175 #define CONTROL_DTR 0x0001
176 #define CONTROL_RTS 0x0002
177 #define CONTROL_CTS 0x0010
178 #define CONTROL_DSR 0x0020
179 #define CONTROL_RING 0x0040
180 #define CONTROL_DCD 0x0080
181 #define CONTROL_WRITE_DTR 0x0100
182 #define CONTROL_WRITE_RTS 0x0200
186 * Reads from the CP2101 configuration registers
187 * 'size' is specified in bytes.
188 * 'data' is a pointer to a pre-allocated array of integers large
189 * enough to hold 'size' bytes (with 4 bytes to each integer)
191 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
192 unsigned int *data, int size)
194 struct usb_serial *serial = port->serial;
196 int result, i, length;
198 /* Number of integers required to contain the array */
199 length = (((size - 1) | 3) + 1)/4;
201 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
203 dev_err(&port->dev, "%s - out of memory.\n", __func__);
207 /* For get requests, the request number must be incremented */
210 /* Issue the request, attempting to read 'size' bytes */
211 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
212 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
215 /* Convert data into an array of integers */
216 for (i = 0; i < length; i++)
217 data[i] = le32_to_cpu(buf[i]);
221 if (result != size) {
222 dev_err(&port->dev, "%s - Unable to send config request, "
223 "request=0x%x size=%d result=%d\n",
224 __func__, request, size, result);
233 * Writes to the CP2101 configuration registers
234 * Values less than 16 bits wide are sent directly
235 * 'size' is specified in bytes.
237 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
238 unsigned int *data, int size)
240 struct usb_serial *serial = port->serial;
242 int result, i, length;
244 /* Number of integers required to contain the array */
245 length = (((size - 1) | 3) + 1)/4;
247 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
249 dev_err(&port->dev, "%s - out of memory.\n",
254 /* Array of integers into bytes */
255 for (i = 0; i < length; i++)
256 buf[i] = cpu_to_le32(data[i]);
259 result = usb_control_msg(serial->dev,
260 usb_sndctrlpipe(serial->dev, 0),
261 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
264 result = usb_control_msg(serial->dev,
265 usb_sndctrlpipe(serial->dev, 0),
266 request, REQTYPE_HOST_TO_DEVICE, data[0],
272 if ((size > 2 && result != size) || result < 0) {
273 dev_err(&port->dev, "%s - Unable to send request, "
274 "request=0x%x size=%d result=%d\n",
275 __func__, request, size, result);
279 /* Single data value */
280 result = usb_control_msg(serial->dev,
281 usb_sndctrlpipe(serial->dev, 0),
282 request, REQTYPE_HOST_TO_DEVICE, data[0],
288 * cp2101_set_config_single
289 * Convenience function for calling cp2101_set_config on single data values
290 * without requiring an integer pointer
292 static inline int cp2101_set_config_single(struct usb_serial_port *port,
293 u8 request, unsigned int data)
295 return cp2101_set_config(port, request, &data, 2);
298 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
301 struct usb_serial *serial = port->serial;
304 dbg("%s - port %d", __func__, port->number);
306 if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
307 dev_err(&port->dev, "%s - Unable to enable UART\n",
312 /* Start reading from the device */
313 usb_fill_bulk_urb(port->read_urb, serial->dev,
314 usb_rcvbulkpipe(serial->dev,
315 port->bulk_in_endpointAddress),
316 port->read_urb->transfer_buffer,
317 port->read_urb->transfer_buffer_length,
318 serial->type->read_bulk_callback,
320 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
322 dev_err(&port->dev, "%s - failed resubmitting read urb, "
323 "error %d\n", __func__, result);
327 /* Configure the termios structure */
328 cp2101_get_termios(tty);
330 /* Set the DTR and RTS pins low */
331 cp2101_tiocmset(tty, NULL, TIOCM_DTR | TIOCM_RTS, 0);
336 static void cp2101_cleanup(struct usb_serial_port *port)
338 struct usb_serial *serial = port->serial;
340 dbg("%s - port %d", __func__, port->number);
343 /* shutdown any bulk reads that might be going on */
344 if (serial->num_bulk_out)
345 usb_kill_urb(port->write_urb);
346 if (serial->num_bulk_in)
347 usb_kill_urb(port->read_urb);
351 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
354 dbg("%s - port %d", __func__, port->number);
356 /* shutdown our urbs */
357 dbg("%s - shutting down urbs", __func__);
358 usb_kill_urb(port->write_urb);
359 usb_kill_urb(port->read_urb);
361 mutex_lock(&port->serial->disc_mutex);
362 if (!port->serial->disconnected)
363 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
364 mutex_unlock(&port->serial->disc_mutex);
369 * Reads the baud rate, data bits, parity, stop bits and flow control mode
370 * from the device, corrects any unsupported values, and configures the
371 * termios structure to reflect the state of the device
373 static void cp2101_get_termios (struct tty_struct *tty)
375 struct usb_serial_port *port = tty->driver_data;
376 unsigned int cflag, modem_ctl[4];
380 dbg("%s - port %d", __func__, port->number);
382 cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
383 /* Convert to baudrate */
385 baud = BAUD_RATE_GEN_FREQ / baud;
387 dbg("%s - baud rate = %d", __func__, baud);
389 tty_encode_baud_rate(tty, baud, baud);
390 cflag = tty->termios->c_cflag;
392 cp2101_get_config(port, CP2101_BITS, &bits, 2);
394 switch (bits & BITS_DATA_MASK) {
396 dbg("%s - data bits = 5", __func__);
400 dbg("%s - data bits = 6", __func__);
404 dbg("%s - data bits = 7", __func__);
408 dbg("%s - data bits = 8", __func__);
412 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
415 bits &= ~BITS_DATA_MASK;
417 cp2101_set_config(port, CP2101_BITS, &bits, 2);
420 dbg("%s - Unknown number of data bits, using 8", __func__);
422 bits &= ~BITS_DATA_MASK;
424 cp2101_set_config(port, CP2101_BITS, &bits, 2);
428 switch (bits & BITS_PARITY_MASK) {
429 case BITS_PARITY_NONE:
430 dbg("%s - parity = NONE", __func__);
433 case BITS_PARITY_ODD:
434 dbg("%s - parity = ODD", __func__);
435 cflag |= (PARENB|PARODD);
437 case BITS_PARITY_EVEN:
438 dbg("%s - parity = EVEN", __func__);
442 case BITS_PARITY_MARK:
443 dbg("%s - parity = MARK (not supported, disabling parity)",
446 bits &= ~BITS_PARITY_MASK;
447 cp2101_set_config(port, CP2101_BITS, &bits, 2);
449 case BITS_PARITY_SPACE:
450 dbg("%s - parity = SPACE (not supported, disabling parity)",
453 bits &= ~BITS_PARITY_MASK;
454 cp2101_set_config(port, CP2101_BITS, &bits, 2);
457 dbg("%s - Unknown parity mode, disabling parity", __func__);
459 bits &= ~BITS_PARITY_MASK;
460 cp2101_set_config(port, CP2101_BITS, &bits, 2);
465 switch (bits & BITS_STOP_MASK) {
467 dbg("%s - stop bits = 1", __func__);
470 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
472 bits &= ~BITS_STOP_MASK;
473 cp2101_set_config(port, CP2101_BITS, &bits, 2);
476 dbg("%s - stop bits = 2", __func__);
480 dbg("%s - Unknown number of stop bits, using 1 stop bit",
482 bits &= ~BITS_STOP_MASK;
483 cp2101_set_config(port, CP2101_BITS, &bits, 2);
487 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
488 if (modem_ctl[0] & 0x0008) {
489 dbg("%s - flow control = CRTSCTS", __func__);
492 dbg("%s - flow control = NONE", __func__);
496 tty->termios->c_cflag = cflag;
499 static void cp2101_set_termios(struct tty_struct *tty,
500 struct usb_serial_port *port, struct ktermios *old_termios)
502 unsigned int cflag, old_cflag;
503 unsigned int baud = 0, bits;
504 unsigned int modem_ctl[4];
506 dbg("%s - port %d", __func__, port->number);
511 tty->termios->c_cflag &= ~CMSPAR;
512 cflag = tty->termios->c_cflag;
513 old_cflag = old_termios->c_cflag;
514 baud = tty_get_baud_rate(tty);
516 /* If the baud rate is to be updated*/
517 if (baud != tty_termios_baud_rate(old_termios)) {
546 dbg("%s - Setting baud rate to %d baud", __func__,
548 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
549 (BAUD_RATE_GEN_FREQ / baud))) {
550 dev_err(&port->dev, "Baud rate requested not "
551 "supported by device\n");
552 baud = tty_termios_baud_rate(old_termios);
556 /* Report back the resulting baud rate */
557 tty_encode_baud_rate(tty, baud, baud);
559 /* If the number of data bits is to be updated */
560 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
561 cp2101_get_config(port, CP2101_BITS, &bits, 2);
562 bits &= ~BITS_DATA_MASK;
563 switch (cflag & CSIZE) {
566 dbg("%s - data bits = 5", __func__);
570 dbg("%s - data bits = 6", __func__);
574 dbg("%s - data bits = 7", __func__);
578 dbg("%s - data bits = 8", __func__);
582 dbg("%s - data bits = 9", __func__);
585 dev_err(&port->dev, "cp2101 driver does not "
586 "support the number of bits requested,"
587 " using 8 bit mode\n");
591 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
592 dev_err(&port->dev, "Number of data bits requested "
593 "not supported by device\n");
596 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
597 cp2101_get_config(port, CP2101_BITS, &bits, 2);
598 bits &= ~BITS_PARITY_MASK;
599 if (cflag & PARENB) {
600 if (cflag & PARODD) {
601 bits |= BITS_PARITY_ODD;
602 dbg("%s - parity = ODD", __func__);
604 bits |= BITS_PARITY_EVEN;
605 dbg("%s - parity = EVEN", __func__);
608 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
609 dev_err(&port->dev, "Parity mode not supported "
613 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
614 cp2101_get_config(port, CP2101_BITS, &bits, 2);
615 bits &= ~BITS_STOP_MASK;
616 if (cflag & CSTOPB) {
618 dbg("%s - stop bits = 2", __func__);
621 dbg("%s - stop bits = 1", __func__);
623 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
624 dev_err(&port->dev, "Number of stop bits requested "
625 "not supported by device\n");
628 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
629 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
630 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
631 __func__, modem_ctl[0], modem_ctl[1],
632 modem_ctl[2], modem_ctl[3]);
634 if (cflag & CRTSCTS) {
635 modem_ctl[0] &= ~0x7B;
636 modem_ctl[0] |= 0x09;
638 dbg("%s - flow control = CRTSCTS", __func__);
640 modem_ctl[0] &= ~0x7B;
641 modem_ctl[0] |= 0x01;
642 modem_ctl[1] |= 0x40;
643 dbg("%s - flow control = NONE", __func__);
646 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
647 __func__, modem_ctl[0], modem_ctl[1],
648 modem_ctl[2], modem_ctl[3]);
649 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
654 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
655 unsigned int set, unsigned int clear)
657 struct usb_serial_port *port = tty->driver_data;
658 unsigned int control = 0;
660 dbg("%s - port %d", __func__, port->number);
662 if (set & TIOCM_RTS) {
663 control |= CONTROL_RTS;
664 control |= CONTROL_WRITE_RTS;
666 if (set & TIOCM_DTR) {
667 control |= CONTROL_DTR;
668 control |= CONTROL_WRITE_DTR;
670 if (clear & TIOCM_RTS) {
671 control &= ~CONTROL_RTS;
672 control |= CONTROL_WRITE_RTS;
674 if (clear & TIOCM_DTR) {
675 control &= ~CONTROL_DTR;
676 control |= CONTROL_WRITE_DTR;
679 dbg("%s - control = 0x%.4x", __func__, control);
681 return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
685 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
687 struct usb_serial_port *port = tty->driver_data;
688 unsigned int control;
691 dbg("%s - port %d", __func__, port->number);
693 cp2101_get_config(port, CP2101_CONTROL, &control, 1);
695 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
696 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
697 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
698 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
699 |((control & CONTROL_RING)? TIOCM_RI : 0)
700 |((control & CONTROL_DCD) ? TIOCM_CD : 0);
702 dbg("%s - control = 0x%.2x", __func__, control);
707 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
709 struct usb_serial_port *port = tty->driver_data;
712 dbg("%s - port %d", __func__, port->number);
713 if (break_state == 0)
717 dbg("%s - turning break %s", __func__,
718 state == BREAK_OFF ? "off" : "on");
719 cp2101_set_config(port, CP2101_BREAK, &state, 2);
722 static int cp2101_startup(struct usb_serial *serial)
724 /* CP2101 buffers behave strangely unless device is reset */
725 usb_reset_device(serial->dev);
729 static void cp2101_shutdown(struct usb_serial *serial)
735 /* Stop reads and writes on all ports */
736 for (i = 0; i < serial->num_ports; ++i)
737 cp2101_cleanup(serial->port[i]);
740 static int __init cp2101_init(void)
744 retval = usb_serial_register(&cp2101_device);
746 return retval; /* Failed to register */
748 retval = usb_register(&cp2101_driver);
750 /* Failed to register */
751 usb_serial_deregister(&cp2101_device);
756 info(DRIVER_DESC " " DRIVER_VERSION);
760 static void __exit cp2101_exit(void)
762 usb_deregister(&cp2101_driver);
763 usb_serial_deregister(&cp2101_device);
766 module_init(cp2101_init);
767 module_exit(cp2101_exit);
769 MODULE_DESCRIPTION(DRIVER_DESC);
770 MODULE_VERSION(DRIVER_VERSION);
771 MODULE_LICENSE("GPL");
773 module_param(debug, bool, S_IRUGO | S_IWUSR);
774 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");