2 * MCT (Magic Control Technology Corp.) USB RS232 Converter Driver
4 * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is largely derived from the Belkin USB Serial Adapter Driver
12 * (see belkin_sa.[ch]). All of the information about the device was acquired
13 * by using SniffUSB on Windows98. For technical details see mct_u232.h.
15 * William G. Greathouse and Greg Kroah-Hartman provided great help on how to
16 * do the reverse engineering and how to write a USB serial device driver.
18 * TO BE DONE, TO BE CHECKED:
19 * DTR/RTS signal handling may be incomplete or incorrect. I have mainly
20 * implemented what I have seen with SniffUSB or found in belkin_sa.c.
21 * For further TODOs check also belkin_sa.c.
24 * Basic tests have been performed with minicom/zmodem transfers and
25 * modem dialing under Linux 2.4.0-test10 (for me it works fine).
27 * 04-Nov-2003 Bill Marr <marr at flex dot com>
28 * - Mimic Windows driver by sending 2 USB 'device request' messages
29 * following normal 'baud rate change' message. This allows data to be
30 * transmitted to RS-232 devices which don't assert the 'CTS' signal.
32 * 10-Nov-2001 Wolfgang Grandegger
33 * - Fixed an endianess problem with the baudrate selection for PowerPC.
35 * 06-Dec-2001 Martin Hamilton <martinh@gnu.org>
36 * Added support for the Belkin F5U109 DB9 adaptor
38 * 30-May-2001 Greg Kroah-Hartman
39 * switched from using spinlock to a semaphore, which fixes lots of problems.
41 * 04-May-2001 Stelian Pop
42 * - Set the maximum bulk output size for Sitecom U232-P25 model to 16 bytes
43 * instead of the device reported 32 (using 32 bytes causes many data
44 * loss, Windows driver uses 16 too).
46 * 02-May-2001 Stelian Pop
47 * - Fixed the baud calculation for Sitecom U232-P25 model
50 * - Identify version on module load.
52 * 06-Jan-2001 Cornel Ciocirlan
53 * - Added support for Sitecom U232-P25 model (Product Id 0x0230)
54 * - Added support for D-Link DU-H3SP USB BAY (Product Id 0x0200)
56 * 29-Nov-2000 Greg Kroah-Hartman
57 * - Added device id table to fit with 2.4.0-test11 structure.
58 * - took out DEAL_WITH_TWO_INT_IN_ENDPOINTS #define as it's not needed
59 * (lots of things will change if/when the usb-serial core changes to
60 * handle these issues.
62 * 27-Nov-2000 Wolfgang Grandegger
63 * A version for kernel 2.4.0-test10 released to the Linux community
64 * (via linux-usb-devel).
67 #include <linux/config.h>
68 #include <linux/kernel.h>
69 #include <linux/errno.h>
70 #include <linux/init.h>
71 #include <linux/slab.h>
72 #include <linux/tty.h>
73 #include <linux/tty_driver.h>
74 #include <linux/tty_flip.h>
75 #include <linux/module.h>
76 #include <linux/spinlock.h>
77 #include <asm/uaccess.h>
78 #include <linux/usb.h>
79 #include "usb-serial.h"
85 #define DRIVER_VERSION "z2.0" /* Linux in-kernel version */
86 #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
87 #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
94 static int mct_u232_startup (struct usb_serial *serial);
95 static void mct_u232_shutdown (struct usb_serial *serial);
96 static int mct_u232_open (struct usb_serial_port *port,
98 static void mct_u232_close (struct usb_serial_port *port,
100 static void mct_u232_read_int_callback (struct urb *urb, struct pt_regs *regs);
101 static void mct_u232_set_termios (struct usb_serial_port *port,
102 struct termios * old);
103 static int mct_u232_ioctl (struct usb_serial_port *port,
107 static void mct_u232_break_ctl (struct usb_serial_port *port,
109 static int mct_u232_tiocmget (struct usb_serial_port *port,
111 static int mct_u232_tiocmset (struct usb_serial_port *port,
112 struct file *file, unsigned int set,
115 * All of the device info needed for the MCT USB-RS232 converter.
117 static struct usb_device_id id_table_combined [] = {
118 { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
119 { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
120 { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
121 { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
122 { } /* Terminating entry */
125 MODULE_DEVICE_TABLE (usb, id_table_combined);
127 static struct usb_driver mct_u232_driver = {
128 .owner = THIS_MODULE,
130 .probe = usb_serial_probe,
131 .disconnect = usb_serial_disconnect,
132 .id_table = id_table_combined,
135 static struct usb_serial_device_type mct_u232_device = {
136 .owner = THIS_MODULE,
138 .short_name = "mct_u232",
139 .id_table = id_table_combined,
140 .num_interrupt_in = 2,
144 .open = mct_u232_open,
145 .close = mct_u232_close,
146 .read_int_callback = mct_u232_read_int_callback,
147 .ioctl = mct_u232_ioctl,
148 .set_termios = mct_u232_set_termios,
149 .break_ctl = mct_u232_break_ctl,
150 .tiocmget = mct_u232_tiocmget,
151 .tiocmset = mct_u232_tiocmset,
152 .attach = mct_u232_startup,
153 .shutdown = mct_u232_shutdown,
157 struct mct_u232_private {
159 unsigned int control_state; /* Modem Line Setting (TIOCM) */
160 unsigned char last_lcr; /* Line Control Register */
161 unsigned char last_lsr; /* Line Status Register */
162 unsigned char last_msr; /* Modem Status Register */
166 * Handle vendor specific USB requests
169 #define WDR_TIMEOUT 5000 /* default urb timeout */
172 * Later day 2.6.0-test kernels have new baud rates like B230400 which
173 * we do not know how to support. We ignore them for the moment.
174 * XXX Rate-limit the error message, it's user triggerable.
176 static int mct_u232_calculate_baud_rate(struct usb_serial *serial, int value)
178 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
179 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
181 case B300: return 0x01;
182 case B600: return 0x02; /* this one not tested */
183 case B1200: return 0x03;
184 case B2400: return 0x04;
185 case B4800: return 0x06;
186 case B9600: return 0x08;
187 case B19200: return 0x09;
188 case B38400: return 0x0a;
189 case B57600: return 0x0b;
190 case B115200: return 0x0c;
192 err("MCT USB-RS232: unsupported baudrate request 0x%x,"
193 " using default of B9600", value);
198 case B300: value = 300; break;
199 case B600: value = 600; break;
200 case B1200: value = 1200; break;
201 case B2400: value = 2400; break;
202 case B4800: value = 4800; break;
203 case B9600: value = 9600; break;
204 case B19200: value = 19200; break;
205 case B38400: value = 38400; break;
206 case B57600: value = 57600; break;
207 case B115200: value = 115200; break;
209 err("MCT USB-RS232: unsupported baudrate request 0x%x,"
210 " using default of B9600", value);
217 static int mct_u232_set_baud_rate(struct usb_serial *serial, int value)
221 unsigned char zero_byte = 0;
223 divisor = cpu_to_le32(mct_u232_calculate_baud_rate(serial, value));
225 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
226 MCT_U232_SET_BAUD_RATE_REQUEST,
227 MCT_U232_SET_REQUEST_TYPE,
228 0, 0, &divisor, MCT_U232_SET_BAUD_RATE_SIZE,
231 err("Set BAUD RATE %d failed (error = %d)", value, rc);
232 dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor);
234 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
235 always sends two extra USB 'device request' messages after the
236 'baud rate change' message. The actual functionality of the
237 request codes in these messages is not fully understood but these
238 particular codes are never seen in any operation besides a baud
239 rate change. Both of these messages send a single byte of data
240 whose value is always zero. The second of these two extra messages
241 is required in order for data to be properly written to an RS-232
242 device which does not assert the 'CTS' signal. */
244 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
245 MCT_U232_SET_UNKNOWN1_REQUEST,
246 MCT_U232_SET_REQUEST_TYPE,
247 0, 0, &zero_byte, MCT_U232_SET_UNKNOWN1_SIZE,
250 err("Sending USB device request code %d failed (error = %d)",
251 MCT_U232_SET_UNKNOWN1_REQUEST, rc);
253 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
254 MCT_U232_SET_UNKNOWN2_REQUEST,
255 MCT_U232_SET_REQUEST_TYPE,
256 0, 0, &zero_byte, MCT_U232_SET_UNKNOWN2_SIZE,
259 err("Sending USB device request code %d failed (error = %d)",
260 MCT_U232_SET_UNKNOWN2_REQUEST, rc);
263 } /* mct_u232_set_baud_rate */
265 static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
268 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
269 MCT_U232_SET_LINE_CTRL_REQUEST,
270 MCT_U232_SET_REQUEST_TYPE,
271 0, 0, &lcr, MCT_U232_SET_LINE_CTRL_SIZE,
274 err("Set LINE CTRL 0x%x failed (error = %d)", lcr, rc);
275 dbg("set_line_ctrl: 0x%x", lcr);
277 } /* mct_u232_set_line_ctrl */
279 static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
280 unsigned int control_state)
283 unsigned char mcr = MCT_U232_MCR_NONE;
285 if (control_state & TIOCM_DTR)
286 mcr |= MCT_U232_MCR_DTR;
287 if (control_state & TIOCM_RTS)
288 mcr |= MCT_U232_MCR_RTS;
290 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
291 MCT_U232_SET_MODEM_CTRL_REQUEST,
292 MCT_U232_SET_REQUEST_TYPE,
293 0, 0, &mcr, MCT_U232_SET_MODEM_CTRL_SIZE,
296 err("Set MODEM CTRL 0x%x failed (error = %d)", mcr, rc);
297 dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
300 } /* mct_u232_set_modem_ctrl */
302 static int mct_u232_get_modem_stat(struct usb_serial *serial, unsigned char *msr)
305 rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
306 MCT_U232_GET_MODEM_STAT_REQUEST,
307 MCT_U232_GET_REQUEST_TYPE,
308 0, 0, msr, MCT_U232_GET_MODEM_STAT_SIZE,
311 err("Get MODEM STATus failed (error = %d)", rc);
314 dbg("get_modem_stat: 0x%x", *msr);
316 } /* mct_u232_get_modem_stat */
318 static void mct_u232_msr_to_state(unsigned int *control_state, unsigned char msr)
320 /* Translate Control Line states */
321 if (msr & MCT_U232_MSR_DSR)
322 *control_state |= TIOCM_DSR;
324 *control_state &= ~TIOCM_DSR;
325 if (msr & MCT_U232_MSR_CTS)
326 *control_state |= TIOCM_CTS;
328 *control_state &= ~TIOCM_CTS;
329 if (msr & MCT_U232_MSR_RI)
330 *control_state |= TIOCM_RI;
332 *control_state &= ~TIOCM_RI;
333 if (msr & MCT_U232_MSR_CD)
334 *control_state |= TIOCM_CD;
336 *control_state &= ~TIOCM_CD;
337 dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state);
338 } /* mct_u232_msr_to_state */
341 * Driver's tty interface functions
344 static int mct_u232_startup (struct usb_serial *serial)
346 struct mct_u232_private *priv;
347 struct usb_serial_port *port, *rport;
349 priv = kmalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
352 memset(priv, 0, sizeof(struct mct_u232_private));
353 spin_lock_init(&priv->lock);
354 usb_set_serial_port_data(serial->port[0], priv);
356 init_waitqueue_head(&serial->port[0]->write_wait);
358 /* Puh, that's dirty */
359 port = serial->port[0];
360 rport = serial->port[1];
361 if (port->read_urb) {
362 /* No unlinking, it wasn't submitted yet. */
363 usb_free_urb(port->read_urb);
365 port->read_urb = rport->interrupt_in_urb;
366 rport->interrupt_in_urb = NULL;
367 port->read_urb->context = port;
370 } /* mct_u232_startup */
373 static void mct_u232_shutdown (struct usb_serial *serial)
375 struct mct_u232_private *priv;
378 dbg("%s", __FUNCTION__);
380 for (i=0; i < serial->num_ports; ++i) {
381 /* My special items, the standard routines free my urbs */
382 priv = usb_get_serial_port_data(serial->port[i]);
384 usb_set_serial_port_data(serial->port[i], NULL);
388 } /* mct_u232_shutdown */
390 static int mct_u232_open (struct usb_serial_port *port, struct file *filp)
392 struct usb_serial *serial = port->serial;
393 struct mct_u232_private *priv = usb_get_serial_port_data(port);
395 unsigned int control_state;
397 unsigned char last_lcr;
398 unsigned char last_msr;
400 dbg("%s port %d", __FUNCTION__, port->number);
402 /* Compensate for a hardware bug: although the Sitecom U232-P25
403 * device reports a maximum output packet size of 32 bytes,
404 * it seems to be able to accept only 16 bytes (and that's what
405 * SniffUSB says too...)
407 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID)
408 port->bulk_out_size = 16;
410 /* Do a defined restart: the normal serial device seems to
411 * always turn on DTR and RTS here, so do the same. I'm not
412 * sure if this is really necessary. But it should not harm
415 spin_lock_irqsave(&priv->lock, flags);
416 if (port->tty->termios->c_cflag & CBAUD)
417 priv->control_state = TIOCM_DTR | TIOCM_RTS;
419 priv->control_state = 0;
421 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
422 MCT_U232_PARITY_NONE |
423 MCT_U232_STOP_BITS_1);
424 control_state = priv->control_state;
425 last_lcr = priv->last_lcr;
426 spin_unlock_irqrestore(&priv->lock, flags);
427 mct_u232_set_modem_ctrl(serial, control_state);
428 mct_u232_set_line_ctrl(serial, last_lcr);
430 /* Read modem status and update control state */
431 mct_u232_get_modem_stat(serial, &last_msr);
432 spin_lock_irqsave(&priv->lock, flags);
433 priv->last_msr = last_msr;
434 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
435 spin_unlock_irqrestore(&priv->lock, flags);
437 port->read_urb->dev = port->serial->dev;
438 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
440 err("usb_submit_urb(read bulk) failed pipe 0x%x err %d",
441 port->read_urb->pipe, retval);
445 port->interrupt_in_urb->dev = port->serial->dev;
446 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
448 err(" usb_submit_urb(read int) failed pipe 0x%x err %d",
449 port->interrupt_in_urb->pipe, retval);
453 } /* mct_u232_open */
456 static void mct_u232_close (struct usb_serial_port *port, struct file *filp)
458 dbg("%s port %d", __FUNCTION__, port->number);
460 if (port->serial->dev) {
461 /* shutdown our urbs */
462 usb_kill_urb(port->write_urb);
463 usb_kill_urb(port->read_urb);
464 usb_kill_urb(port->interrupt_in_urb);
466 } /* mct_u232_close */
469 static void mct_u232_read_int_callback (struct urb *urb, struct pt_regs *regs)
471 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
472 struct mct_u232_private *priv = usb_get_serial_port_data(port);
473 struct usb_serial *serial = port->serial;
474 struct tty_struct *tty;
475 unsigned char *data = urb->transfer_buffer;
479 switch (urb->status) {
486 /* this urb is terminated, clean up */
487 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
490 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
495 dbg("%s - bad serial pointer, exiting", __FUNCTION__);
499 dbg("%s - port %d", __FUNCTION__, port->number);
500 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
503 * Work-a-round: handle the 'usual' bulk-in pipe here
505 if (urb->transfer_buffer_length > 2) {
508 if (urb->actual_length) {
509 for (i = 0; i < urb->actual_length ; ++i) {
510 tty_insert_flip_char(tty, data[i], 0);
512 tty_flip_buffer_push(tty);
518 * The interrupt-in pipe signals exceptional conditions (modem line
519 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
521 spin_lock_irqsave(&priv->lock, flags);
522 priv->last_msr = data[MCT_U232_MSR_INDEX];
524 /* Record Control Line states */
525 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
528 /* Not yet handled. See belin_sa.c for further information */
529 /* Now to report any errors */
530 priv->last_lsr = data[MCT_U232_LSR_INDEX];
532 * fill in the flip buffer here, but I do not know the relation
533 * to the current/next receive buffer or characters. I need
534 * to look in to this before committing any code.
536 if (priv->last_lsr & MCT_U232_LSR_ERR) {
539 if (priv->last_lsr & MCT_U232_LSR_OE) {
542 if (priv->last_lsr & MCT_U232_LSR_PE) {
545 if (priv->last_lsr & MCT_U232_LSR_FE) {
547 /* Break Indicator */
548 if (priv->last_lsr & MCT_U232_LSR_BI) {
552 spin_unlock_irqrestore(&priv->lock, flags);
554 status = usb_submit_urb (urb, GFP_ATOMIC);
556 err ("%s - usb_submit_urb failed with result %d",
557 __FUNCTION__, status);
558 } /* mct_u232_read_int_callback */
560 static void mct_u232_set_termios (struct usb_serial_port *port,
561 struct termios *old_termios)
563 struct usb_serial *serial = port->serial;
564 struct mct_u232_private *priv = usb_get_serial_port_data(port);
565 unsigned int iflag = port->tty->termios->c_iflag;
566 unsigned int cflag = port->tty->termios->c_cflag;
567 unsigned int old_cflag = old_termios->c_cflag;
569 unsigned int control_state, new_state;
570 unsigned char last_lcr;
572 /* get a local copy of the current port settings */
573 spin_lock_irqsave(&priv->lock, flags);
574 control_state = priv->control_state;
575 spin_unlock_irqrestore(&priv->lock, flags);
580 * Do not attempt to cache old rates and skip settings,
581 * disconnects screw such tricks up completely.
582 * Premature optimization is the root of all evil.
585 /* reassert DTR and (maybe) RTS on transition from B0 */
586 if ((old_cflag & CBAUD) == B0) {
587 dbg("%s: baud was B0", __FUNCTION__);
588 control_state |= TIOCM_DTR;
589 /* don't set RTS if using hardware flow control */
590 if (!(old_cflag & CRTSCTS)) {
591 control_state |= TIOCM_RTS;
593 mct_u232_set_modem_ctrl(serial, control_state);
596 mct_u232_set_baud_rate(serial, cflag & CBAUD);
598 if ((cflag & CBAUD) == B0 ) {
599 dbg("%s: baud is B0", __FUNCTION__);
600 /* Drop RTS and DTR */
601 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
602 mct_u232_set_modem_ctrl(serial, control_state);
606 * Update line control register (LCR)
611 last_lcr |= (cflag & PARODD) ?
612 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
614 last_lcr |= MCT_U232_PARITY_NONE;
616 /* set the number of data bits */
617 switch (cflag & CSIZE) {
619 last_lcr |= MCT_U232_DATA_BITS_5; break;
621 last_lcr |= MCT_U232_DATA_BITS_6; break;
623 last_lcr |= MCT_U232_DATA_BITS_7; break;
625 last_lcr |= MCT_U232_DATA_BITS_8; break;
627 err("CSIZE was not CS5-CS8, using default of 8");
628 last_lcr |= MCT_U232_DATA_BITS_8;
632 /* set the number of stop bits */
633 last_lcr |= (cflag & CSTOPB) ?
634 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
636 mct_u232_set_line_ctrl(serial, last_lcr);
639 * Set flow control: well, I do not really now how to handle DTR/RTS.
640 * Just do what we have seen with SniffUSB on Win98.
642 /* Drop DTR/RTS if no flow control otherwise assert */
643 new_state = control_state;
644 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
645 new_state |= TIOCM_DTR | TIOCM_RTS;
647 new_state &= ~(TIOCM_DTR | TIOCM_RTS);
648 if (new_state != control_state) {
649 mct_u232_set_modem_ctrl(serial, new_state);
650 control_state = new_state;
653 /* save off the modified port settings */
654 spin_lock_irqsave(&priv->lock, flags);
655 priv->control_state = control_state;
656 priv->last_lcr = last_lcr;
657 spin_unlock_irqrestore(&priv->lock, flags);
658 } /* mct_u232_set_termios */
660 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
662 struct usb_serial *serial = port->serial;
663 struct mct_u232_private *priv = usb_get_serial_port_data(port);
667 dbg("%sstate=%d", __FUNCTION__, break_state);
669 spin_lock_irqsave(&priv->lock, flags);
670 lcr = priv->last_lcr;
671 spin_unlock_irqrestore(&priv->lock, flags);
674 lcr |= MCT_U232_SET_BREAK;
676 mct_u232_set_line_ctrl(serial, lcr);
677 } /* mct_u232_break_ctl */
680 static int mct_u232_tiocmget (struct usb_serial_port *port, struct file *file)
682 struct mct_u232_private *priv = usb_get_serial_port_data(port);
683 unsigned int control_state;
686 dbg("%s", __FUNCTION__);
688 spin_lock_irqsave(&priv->lock, flags);
689 control_state = priv->control_state;
690 spin_unlock_irqrestore(&priv->lock, flags);
692 return control_state;
695 static int mct_u232_tiocmset (struct usb_serial_port *port, struct file *file,
696 unsigned int set, unsigned int clear)
698 struct usb_serial *serial = port->serial;
699 struct mct_u232_private *priv = usb_get_serial_port_data(port);
700 unsigned int control_state;
703 dbg("%s", __FUNCTION__);
705 spin_lock_irqsave(&priv->lock, flags);
706 control_state = priv->control_state;
709 control_state |= TIOCM_RTS;
711 control_state |= TIOCM_DTR;
712 if (clear & TIOCM_RTS)
713 control_state &= ~TIOCM_RTS;
714 if (clear & TIOCM_DTR)
715 control_state &= ~TIOCM_DTR;
717 priv->control_state = control_state;
718 spin_unlock_irqrestore(&priv->lock, flags);
719 return mct_u232_set_modem_ctrl(serial, control_state);
722 static int mct_u232_ioctl (struct usb_serial_port *port, struct file * file,
723 unsigned int cmd, unsigned long arg)
725 dbg("%scmd=0x%x", __FUNCTION__, cmd);
727 /* Based on code from acm.c and others */
730 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
735 /* return count of modemline transitions */
740 dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
741 return(-ENOIOCTLCMD);
745 } /* mct_u232_ioctl */
748 static int __init mct_u232_init (void)
751 retval = usb_serial_register(&mct_u232_device);
753 goto failed_usb_serial_register;
754 retval = usb_register(&mct_u232_driver);
756 goto failed_usb_register;
757 info(DRIVER_DESC " " DRIVER_VERSION);
760 usb_serial_deregister(&mct_u232_device);
761 failed_usb_serial_register:
766 static void __exit mct_u232_exit (void)
768 usb_deregister (&mct_u232_driver);
769 usb_serial_deregister (&mct_u232_device);
773 module_init (mct_u232_init);
774 module_exit(mct_u232_exit);
776 MODULE_AUTHOR( DRIVER_AUTHOR );
777 MODULE_DESCRIPTION( DRIVER_DESC );
778 MODULE_LICENSE("GPL");
780 module_param(debug, bool, S_IRUGO | S_IWUSR);
781 MODULE_PARM_DESC(debug, "Debug enabled or not");