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/kernel.h>
68 #include <linux/errno.h>
69 #include <linux/init.h>
70 #include <linux/slab.h>
71 #include <linux/tty.h>
72 #include <linux/tty_driver.h>
73 #include <linux/tty_flip.h>
74 #include <linux/module.h>
75 #include <linux/spinlock.h>
76 #include <asm/uaccess.h>
77 #include <linux/usb.h>
78 #include <linux/usb/serial.h>
84 #define DRIVER_VERSION "z2.1" /* Linux in-kernel version */
85 #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
86 #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
93 static int mct_u232_startup (struct usb_serial *serial);
94 static void mct_u232_shutdown (struct usb_serial *serial);
95 static int mct_u232_open (struct usb_serial_port *port,
97 static void mct_u232_close (struct usb_serial_port *port,
99 static void mct_u232_read_int_callback (struct urb *urb);
100 static void mct_u232_set_termios (struct usb_serial_port *port,
101 struct ktermios * old);
102 static int mct_u232_ioctl (struct usb_serial_port *port,
106 static void mct_u232_break_ctl (struct usb_serial_port *port,
108 static int mct_u232_tiocmget (struct usb_serial_port *port,
110 static int mct_u232_tiocmset (struct usb_serial_port *port,
111 struct file *file, unsigned int set,
113 static void mct_u232_throttle (struct usb_serial_port *port);
114 static void mct_u232_unthrottle (struct usb_serial_port *port);
118 * All of the device info needed for the MCT USB-RS232 converter.
120 static struct usb_device_id id_table_combined [] = {
121 { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
122 { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
123 { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
124 { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
125 { } /* Terminating entry */
128 MODULE_DEVICE_TABLE (usb, id_table_combined);
130 static struct usb_driver mct_u232_driver = {
132 .probe = usb_serial_probe,
133 .disconnect = usb_serial_disconnect,
134 .id_table = id_table_combined,
138 static struct usb_serial_driver mct_u232_device = {
140 .owner = THIS_MODULE,
143 .description = "MCT U232",
144 .usb_driver = &mct_u232_driver,
145 .id_table = id_table_combined,
147 .open = mct_u232_open,
148 .close = mct_u232_close,
149 .throttle = mct_u232_throttle,
150 .unthrottle = mct_u232_unthrottle,
151 .read_int_callback = mct_u232_read_int_callback,
152 .ioctl = mct_u232_ioctl,
153 .set_termios = mct_u232_set_termios,
154 .break_ctl = mct_u232_break_ctl,
155 .tiocmget = mct_u232_tiocmget,
156 .tiocmset = mct_u232_tiocmset,
157 .attach = mct_u232_startup,
158 .shutdown = mct_u232_shutdown,
162 struct mct_u232_private {
164 unsigned int control_state; /* Modem Line Setting (TIOCM) */
165 unsigned char last_lcr; /* Line Control Register */
166 unsigned char last_lsr; /* Line Status Register */
167 unsigned char last_msr; /* Modem Status Register */
168 unsigned int rx_flags; /* Throttling flags */
171 #define THROTTLED 0x01
174 * Handle vendor specific USB requests
177 #define WDR_TIMEOUT 5000 /* default urb timeout */
180 * Later day 2.6.0-test kernels have new baud rates like B230400 which
181 * we do not know how to support. We ignore them for the moment.
183 static int mct_u232_calculate_baud_rate(struct usb_serial *serial, speed_t value, speed_t *result)
187 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
188 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
190 case 300: return 0x01;
191 case 600: return 0x02; /* this one not tested */
192 case 1200: return 0x03;
193 case 2400: return 0x04;
194 case 4800: return 0x06;
195 case 9600: return 0x08;
196 case 19200: return 0x09;
197 case 38400: return 0x0a;
198 case 57600: return 0x0b;
199 case 115200: return 0x0c;
205 /* FIXME: Can we use any divider - should we do
206 divider = 115200/value;
207 real baud = 115200/divider */
227 static int mct_u232_set_baud_rate(struct usb_serial *serial, struct usb_serial_port *port,
232 unsigned char zero_byte = 0;
233 unsigned char cts_enable_byte = 0;
236 divisor = cpu_to_le32(mct_u232_calculate_baud_rate(serial, value, &speed));
238 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
239 MCT_U232_SET_BAUD_RATE_REQUEST,
240 MCT_U232_SET_REQUEST_TYPE,
241 0, 0, &divisor, MCT_U232_SET_BAUD_RATE_SIZE,
243 if (rc < 0) /*FIXME: What value speed results */
244 err("Set BAUD RATE %d failed (error = %d)", value, rc);
246 tty_encode_baud_rate(port->tty, speed, speed);
247 dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor);
249 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
250 always sends two extra USB 'device request' messages after the
251 'baud rate change' message. The actual functionality of the
252 request codes in these messages is not fully understood but these
253 particular codes are never seen in any operation besides a baud
254 rate change. Both of these messages send a single byte of data.
255 In the first message, the value of this byte is always zero.
257 The second message has been determined experimentally to control
258 whether data will be transmitted to a device which is not asserting
259 the 'CTS' signal. If the second message's data byte is zero, data
260 will be transmitted even if 'CTS' is not asserted (i.e. no hardware
261 flow control). if the second message's data byte is nonzero (a value
262 of 1 is used by this driver), data will not be transmitted to a device
263 which is not asserting 'CTS'.
266 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
267 MCT_U232_SET_UNKNOWN1_REQUEST,
268 MCT_U232_SET_REQUEST_TYPE,
269 0, 0, &zero_byte, MCT_U232_SET_UNKNOWN1_SIZE,
272 err("Sending USB device request code %d failed (error = %d)",
273 MCT_U232_SET_UNKNOWN1_REQUEST, rc);
275 if (port && C_CRTSCTS(port->tty)) {
279 dbg("set_baud_rate: send second control message, data = %02X", cts_enable_byte);
280 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
281 MCT_U232_SET_CTS_REQUEST,
282 MCT_U232_SET_REQUEST_TYPE,
283 0, 0, &cts_enable_byte, MCT_U232_SET_CTS_SIZE,
286 err("Sending USB device request code %d failed (error = %d)",
287 MCT_U232_SET_CTS_REQUEST, rc);
290 } /* mct_u232_set_baud_rate */
292 static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
295 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
296 MCT_U232_SET_LINE_CTRL_REQUEST,
297 MCT_U232_SET_REQUEST_TYPE,
298 0, 0, &lcr, MCT_U232_SET_LINE_CTRL_SIZE,
301 err("Set LINE CTRL 0x%x failed (error = %d)", lcr, rc);
302 dbg("set_line_ctrl: 0x%x", lcr);
304 } /* mct_u232_set_line_ctrl */
306 static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
307 unsigned int control_state)
310 unsigned char mcr = MCT_U232_MCR_NONE;
312 if (control_state & TIOCM_DTR)
313 mcr |= MCT_U232_MCR_DTR;
314 if (control_state & TIOCM_RTS)
315 mcr |= MCT_U232_MCR_RTS;
317 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
318 MCT_U232_SET_MODEM_CTRL_REQUEST,
319 MCT_U232_SET_REQUEST_TYPE,
320 0, 0, &mcr, MCT_U232_SET_MODEM_CTRL_SIZE,
323 err("Set MODEM CTRL 0x%x failed (error = %d)", mcr, rc);
324 dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
327 } /* mct_u232_set_modem_ctrl */
329 static int mct_u232_get_modem_stat(struct usb_serial *serial, unsigned char *msr)
332 rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
333 MCT_U232_GET_MODEM_STAT_REQUEST,
334 MCT_U232_GET_REQUEST_TYPE,
335 0, 0, msr, MCT_U232_GET_MODEM_STAT_SIZE,
338 err("Get MODEM STATus failed (error = %d)", rc);
341 dbg("get_modem_stat: 0x%x", *msr);
343 } /* mct_u232_get_modem_stat */
345 static void mct_u232_msr_to_state(unsigned int *control_state, unsigned char msr)
347 /* Translate Control Line states */
348 if (msr & MCT_U232_MSR_DSR)
349 *control_state |= TIOCM_DSR;
351 *control_state &= ~TIOCM_DSR;
352 if (msr & MCT_U232_MSR_CTS)
353 *control_state |= TIOCM_CTS;
355 *control_state &= ~TIOCM_CTS;
356 if (msr & MCT_U232_MSR_RI)
357 *control_state |= TIOCM_RI;
359 *control_state &= ~TIOCM_RI;
360 if (msr & MCT_U232_MSR_CD)
361 *control_state |= TIOCM_CD;
363 *control_state &= ~TIOCM_CD;
364 dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state);
365 } /* mct_u232_msr_to_state */
368 * Driver's tty interface functions
371 static int mct_u232_startup (struct usb_serial *serial)
373 struct mct_u232_private *priv;
374 struct usb_serial_port *port, *rport;
376 priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
379 spin_lock_init(&priv->lock);
380 usb_set_serial_port_data(serial->port[0], priv);
382 init_waitqueue_head(&serial->port[0]->write_wait);
384 /* Puh, that's dirty */
385 port = serial->port[0];
386 rport = serial->port[1];
387 /* No unlinking, it wasn't submitted yet. */
388 usb_free_urb(port->read_urb);
389 port->read_urb = rport->interrupt_in_urb;
390 rport->interrupt_in_urb = NULL;
391 port->read_urb->context = port;
394 } /* mct_u232_startup */
397 static void mct_u232_shutdown (struct usb_serial *serial)
399 struct mct_u232_private *priv;
404 for (i=0; i < serial->num_ports; ++i) {
405 /* My special items, the standard routines free my urbs */
406 priv = usb_get_serial_port_data(serial->port[i]);
408 usb_set_serial_port_data(serial->port[i], NULL);
412 } /* mct_u232_shutdown */
414 static int mct_u232_open (struct usb_serial_port *port, struct file *filp)
416 struct usb_serial *serial = port->serial;
417 struct mct_u232_private *priv = usb_get_serial_port_data(port);
419 unsigned int control_state;
421 unsigned char last_lcr;
422 unsigned char last_msr;
424 dbg("%s port %d", __func__, port->number);
426 /* Compensate for a hardware bug: although the Sitecom U232-P25
427 * device reports a maximum output packet size of 32 bytes,
428 * it seems to be able to accept only 16 bytes (and that's what
429 * SniffUSB says too...)
431 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID)
432 port->bulk_out_size = 16;
434 /* Do a defined restart: the normal serial device seems to
435 * always turn on DTR and RTS here, so do the same. I'm not
436 * sure if this is really necessary. But it should not harm
439 spin_lock_irqsave(&priv->lock, flags);
440 if (port->tty->termios->c_cflag & CBAUD)
441 priv->control_state = TIOCM_DTR | TIOCM_RTS;
443 priv->control_state = 0;
445 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
446 MCT_U232_PARITY_NONE |
447 MCT_U232_STOP_BITS_1);
448 control_state = priv->control_state;
449 last_lcr = priv->last_lcr;
450 spin_unlock_irqrestore(&priv->lock, flags);
451 mct_u232_set_modem_ctrl(serial, control_state);
452 mct_u232_set_line_ctrl(serial, last_lcr);
454 /* Read modem status and update control state */
455 mct_u232_get_modem_stat(serial, &last_msr);
456 spin_lock_irqsave(&priv->lock, flags);
457 priv->last_msr = last_msr;
458 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
459 spin_unlock_irqrestore(&priv->lock, flags);
461 port->read_urb->dev = port->serial->dev;
462 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
464 err("usb_submit_urb(read bulk) failed pipe 0x%x err %d",
465 port->read_urb->pipe, retval);
469 port->interrupt_in_urb->dev = port->serial->dev;
470 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
472 usb_kill_urb(port->read_urb);
473 err(" usb_submit_urb(read int) failed pipe 0x%x err %d",
474 port->interrupt_in_urb->pipe, retval);
481 } /* mct_u232_open */
484 static void mct_u232_close (struct usb_serial_port *port, struct file *filp)
486 unsigned int c_cflag;
487 unsigned int control_state;
488 struct mct_u232_private *priv = usb_get_serial_port_data(port);
489 dbg("%s port %d", __func__, port->number);
492 c_cflag = port->tty->termios->c_cflag;
493 mutex_lock(&port->serial->disc_mutex);
494 if (c_cflag & HUPCL && !port->serial->disconnected) {
495 /* drop DTR and RTS */
496 spin_lock_irq(&priv->lock);
497 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
498 control_state = priv->control_state;
499 spin_unlock_irq(&priv->lock);
500 mct_u232_set_modem_ctrl(port->serial, control_state);
502 mutex_unlock(&port->serial->disc_mutex);
506 if (port->serial->dev) {
507 /* shutdown our urbs */
508 usb_kill_urb(port->write_urb);
509 usb_kill_urb(port->read_urb);
510 usb_kill_urb(port->interrupt_in_urb);
512 } /* mct_u232_close */
515 static void mct_u232_read_int_callback (struct urb *urb)
517 struct usb_serial_port *port = urb->context;
518 struct mct_u232_private *priv = usb_get_serial_port_data(port);
519 struct usb_serial *serial = port->serial;
520 struct tty_struct *tty;
521 unsigned char *data = urb->transfer_buffer;
523 int status = urb->status;
533 /* this urb is terminated, clean up */
534 dbg("%s - urb shutting down with status: %d",
538 dbg("%s - nonzero urb status received: %d",
544 dbg("%s - bad serial pointer, exiting", __func__);
548 dbg("%s - port %d", __func__, port->number);
549 usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, data);
552 * Work-a-round: handle the 'usual' bulk-in pipe here
554 if (urb->transfer_buffer_length > 2) {
557 if (urb->actual_length) {
558 for (i = 0; i < urb->actual_length ; ++i) {
559 tty_insert_flip_char(tty, data[i], 0);
561 tty_flip_buffer_push(tty);
567 * The interrupt-in pipe signals exceptional conditions (modem line
568 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
570 spin_lock_irqsave(&priv->lock, flags);
571 priv->last_msr = data[MCT_U232_MSR_INDEX];
573 /* Record Control Line states */
574 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
577 /* Not yet handled. See belin_sa.c for further information */
578 /* Now to report any errors */
579 priv->last_lsr = data[MCT_U232_LSR_INDEX];
581 * fill in the flip buffer here, but I do not know the relation
582 * to the current/next receive buffer or characters. I need
583 * to look in to this before committing any code.
585 if (priv->last_lsr & MCT_U232_LSR_ERR) {
588 if (priv->last_lsr & MCT_U232_LSR_OE) {
591 if (priv->last_lsr & MCT_U232_LSR_PE) {
594 if (priv->last_lsr & MCT_U232_LSR_FE) {
596 /* Break Indicator */
597 if (priv->last_lsr & MCT_U232_LSR_BI) {
601 spin_unlock_irqrestore(&priv->lock, flags);
603 retval = usb_submit_urb (urb, GFP_ATOMIC);
605 err ("%s - usb_submit_urb failed with result %d",
607 } /* mct_u232_read_int_callback */
609 static void mct_u232_set_termios (struct usb_serial_port *port,
610 struct ktermios *old_termios)
612 struct usb_serial *serial = port->serial;
613 struct mct_u232_private *priv = usb_get_serial_port_data(port);
614 struct ktermios *termios = port->tty->termios;
615 unsigned int cflag = termios->c_cflag;
616 unsigned int old_cflag = old_termios->c_cflag;
618 unsigned int control_state;
619 unsigned char last_lcr;
621 /* get a local copy of the current port settings */
622 spin_lock_irqsave(&priv->lock, flags);
623 control_state = priv->control_state;
624 spin_unlock_irqrestore(&priv->lock, flags);
629 * Do not attempt to cache old rates and skip settings,
630 * disconnects screw such tricks up completely.
631 * Premature optimization is the root of all evil.
634 /* reassert DTR and RTS on transition from B0 */
635 if ((old_cflag & CBAUD) == B0) {
636 dbg("%s: baud was B0", __func__);
637 control_state |= TIOCM_DTR | TIOCM_RTS;
638 mct_u232_set_modem_ctrl(serial, control_state);
641 mct_u232_set_baud_rate(serial, port, tty_get_baud_rate(port->tty));
643 if ((cflag & CBAUD) == B0 ) {
644 dbg("%s: baud is B0", __func__);
645 /* Drop RTS and DTR */
646 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
647 mct_u232_set_modem_ctrl(serial, control_state);
651 * Update line control register (LCR)
656 last_lcr |= (cflag & PARODD) ?
657 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
659 last_lcr |= MCT_U232_PARITY_NONE;
661 /* set the number of data bits */
662 switch (cflag & CSIZE) {
664 last_lcr |= MCT_U232_DATA_BITS_5; break;
666 last_lcr |= MCT_U232_DATA_BITS_6; break;
668 last_lcr |= MCT_U232_DATA_BITS_7; break;
670 last_lcr |= MCT_U232_DATA_BITS_8; break;
672 err("CSIZE was not CS5-CS8, using default of 8");
673 last_lcr |= MCT_U232_DATA_BITS_8;
677 termios->c_cflag &= ~CMSPAR;
679 /* set the number of stop bits */
680 last_lcr |= (cflag & CSTOPB) ?
681 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
683 mct_u232_set_line_ctrl(serial, last_lcr);
685 /* save off the modified port settings */
686 spin_lock_irqsave(&priv->lock, flags);
687 priv->control_state = control_state;
688 priv->last_lcr = last_lcr;
689 spin_unlock_irqrestore(&priv->lock, flags);
690 } /* mct_u232_set_termios */
692 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
694 struct usb_serial *serial = port->serial;
695 struct mct_u232_private *priv = usb_get_serial_port_data(port);
699 dbg("%sstate=%d", __func__, break_state);
701 spin_lock_irqsave(&priv->lock, flags);
702 lcr = priv->last_lcr;
703 spin_unlock_irqrestore(&priv->lock, flags);
706 lcr |= MCT_U232_SET_BREAK;
708 mct_u232_set_line_ctrl(serial, lcr);
709 } /* mct_u232_break_ctl */
712 static int mct_u232_tiocmget (struct usb_serial_port *port, struct file *file)
714 struct mct_u232_private *priv = usb_get_serial_port_data(port);
715 unsigned int control_state;
720 spin_lock_irqsave(&priv->lock, flags);
721 control_state = priv->control_state;
722 spin_unlock_irqrestore(&priv->lock, flags);
724 return control_state;
727 static int mct_u232_tiocmset (struct usb_serial_port *port, struct file *file,
728 unsigned int set, unsigned int clear)
730 struct usb_serial *serial = port->serial;
731 struct mct_u232_private *priv = usb_get_serial_port_data(port);
732 unsigned int control_state;
737 spin_lock_irqsave(&priv->lock, flags);
738 control_state = priv->control_state;
741 control_state |= TIOCM_RTS;
743 control_state |= TIOCM_DTR;
744 if (clear & TIOCM_RTS)
745 control_state &= ~TIOCM_RTS;
746 if (clear & TIOCM_DTR)
747 control_state &= ~TIOCM_DTR;
749 priv->control_state = control_state;
750 spin_unlock_irqrestore(&priv->lock, flags);
751 return mct_u232_set_modem_ctrl(serial, control_state);
754 static int mct_u232_ioctl (struct usb_serial_port *port, struct file * file,
755 unsigned int cmd, unsigned long arg)
757 dbg("%scmd=0x%x", __func__, cmd);
759 /* Based on code from acm.c and others */
762 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
767 /* return count of modemline transitions */
772 dbg("%s: arg not supported - 0x%04x", __func__,cmd);
773 return(-ENOIOCTLCMD);
777 } /* mct_u232_ioctl */
779 static void mct_u232_throttle (struct usb_serial_port *port)
781 struct mct_u232_private *priv = usb_get_serial_port_data(port);
783 unsigned int control_state;
784 struct tty_struct *tty;
787 dbg("%s - port %d", __func__, port->number);
789 spin_lock_irqsave(&priv->lock, flags);
790 priv->rx_flags |= THROTTLED;
791 if (C_CRTSCTS(tty)) {
792 priv->control_state &= ~TIOCM_RTS;
793 control_state = priv->control_state;
794 spin_unlock_irqrestore(&priv->lock, flags);
795 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
797 spin_unlock_irqrestore(&priv->lock, flags);
802 static void mct_u232_unthrottle (struct usb_serial_port *port)
804 struct mct_u232_private *priv = usb_get_serial_port_data(port);
806 unsigned int control_state;
807 struct tty_struct *tty;
809 dbg("%s - port %d", __func__, port->number);
812 spin_lock_irqsave(&priv->lock, flags);
813 if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
814 priv->rx_flags &= ~THROTTLED;
815 priv->control_state |= TIOCM_RTS;
816 control_state = priv->control_state;
817 spin_unlock_irqrestore(&priv->lock, flags);
818 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
820 spin_unlock_irqrestore(&priv->lock, flags);
824 static int __init mct_u232_init (void)
827 retval = usb_serial_register(&mct_u232_device);
829 goto failed_usb_serial_register;
830 retval = usb_register(&mct_u232_driver);
832 goto failed_usb_register;
833 info(DRIVER_DESC " " DRIVER_VERSION);
836 usb_serial_deregister(&mct_u232_device);
837 failed_usb_serial_register:
842 static void __exit mct_u232_exit (void)
844 usb_deregister (&mct_u232_driver);
845 usb_serial_deregister (&mct_u232_device);
849 module_init (mct_u232_init);
850 module_exit(mct_u232_exit);
852 MODULE_AUTHOR( DRIVER_AUTHOR );
853 MODULE_DESCRIPTION( DRIVER_DESC );
854 MODULE_LICENSE("GPL");
856 module_param(debug, bool, S_IRUGO | S_IWUSR);
857 MODULE_PARM_DESC(debug, "Debug enabled or not");