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 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/tty.h>
29 #include <linux/tty_driver.h>
30 #include <linux/tty_flip.h>
31 #include <linux/module.h>
32 #include <linux/spinlock.h>
33 #include <linux/uaccess.h>
34 #include <asm/unaligned.h>
35 #include <linux/usb.h>
36 #include <linux/usb/serial.h>
37 #include <linux/serial.h>
38 #include <linux/ioctl.h>
44 #define DRIVER_VERSION "z2.1" /* Linux in-kernel version */
45 #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
46 #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
53 static int mct_u232_startup(struct usb_serial *serial);
54 static void mct_u232_release(struct usb_serial *serial);
55 static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
56 static void mct_u232_close(struct usb_serial_port *port);
57 static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
58 static void mct_u232_read_int_callback(struct urb *urb);
59 static void mct_u232_set_termios(struct tty_struct *tty,
60 struct usb_serial_port *port, struct ktermios *old);
61 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
62 static int mct_u232_tiocmget(struct tty_struct *tty);
63 static int mct_u232_tiocmset(struct tty_struct *tty,
64 unsigned int set, unsigned int clear);
65 static int mct_u232_ioctl(struct tty_struct *tty,
66 unsigned int cmd, unsigned long arg);
67 static int mct_u232_get_icount(struct tty_struct *tty,
68 struct serial_icounter_struct *icount);
69 static void mct_u232_throttle(struct tty_struct *tty);
70 static void mct_u232_unthrottle(struct tty_struct *tty);
74 * All of the device info needed for the MCT USB-RS232 converter.
76 static const struct usb_device_id id_table_combined[] = {
77 { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
78 { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
79 { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
80 { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
81 { } /* Terminating entry */
84 MODULE_DEVICE_TABLE(usb, id_table_combined);
86 static struct usb_driver mct_u232_driver = {
88 .probe = usb_serial_probe,
89 .disconnect = usb_serial_disconnect,
90 .id_table = id_table_combined,
93 static struct usb_serial_driver mct_u232_device = {
98 .description = "MCT U232",
99 .id_table = id_table_combined,
101 .open = mct_u232_open,
102 .close = mct_u232_close,
103 .dtr_rts = mct_u232_dtr_rts,
104 .throttle = mct_u232_throttle,
105 .unthrottle = mct_u232_unthrottle,
106 .read_int_callback = mct_u232_read_int_callback,
107 .set_termios = mct_u232_set_termios,
108 .break_ctl = mct_u232_break_ctl,
109 .tiocmget = mct_u232_tiocmget,
110 .tiocmset = mct_u232_tiocmset,
111 .attach = mct_u232_startup,
112 .release = mct_u232_release,
113 .ioctl = mct_u232_ioctl,
114 .get_icount = mct_u232_get_icount,
117 static struct usb_serial_driver * const serial_drivers[] = {
118 &mct_u232_device, NULL
121 struct mct_u232_private {
123 unsigned int control_state; /* Modem Line Setting (TIOCM) */
124 unsigned char last_lcr; /* Line Control Register */
125 unsigned char last_lsr; /* Line Status Register */
126 unsigned char last_msr; /* Modem Status Register */
127 unsigned int rx_flags; /* Throttling flags */
128 struct async_icount icount;
129 wait_queue_head_t msr_wait; /* for handling sleeping while waiting
130 for msr change to happen */
133 #define THROTTLED 0x01
136 * Handle vendor specific USB requests
139 #define WDR_TIMEOUT 5000 /* default urb timeout */
142 * Later day 2.6.0-test kernels have new baud rates like B230400 which
143 * we do not know how to support. We ignore them for the moment.
145 static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
146 speed_t value, speed_t *result)
150 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
151 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
156 return 0x02; /* this one not tested */
178 /* FIXME: Can we use any divider - should we do
179 divider = 115200/value;
180 real baud = 115200/divider */
200 static int mct_u232_set_baud_rate(struct tty_struct *tty,
201 struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
203 unsigned int divisor;
206 unsigned char cts_enable_byte = 0;
209 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
213 divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
214 put_unaligned_le32(cpu_to_le32(divisor), buf);
215 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
216 MCT_U232_SET_BAUD_RATE_REQUEST,
217 MCT_U232_SET_REQUEST_TYPE,
218 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
220 if (rc < 0) /*FIXME: What value speed results */
221 dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
224 tty_encode_baud_rate(tty, speed, speed);
225 dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor);
227 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
228 always sends two extra USB 'device request' messages after the
229 'baud rate change' message. The actual functionality of the
230 request codes in these messages is not fully understood but these
231 particular codes are never seen in any operation besides a baud
232 rate change. Both of these messages send a single byte of data.
233 In the first message, the value of this byte is always zero.
235 The second message has been determined experimentally to control
236 whether data will be transmitted to a device which is not asserting
237 the 'CTS' signal. If the second message's data byte is zero, data
238 will be transmitted even if 'CTS' is not asserted (i.e. no hardware
239 flow control). if the second message's data byte is nonzero (a
240 value of 1 is used by this driver), data will not be transmitted to
241 a device which is not asserting 'CTS'.
245 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
246 MCT_U232_SET_UNKNOWN1_REQUEST,
247 MCT_U232_SET_REQUEST_TYPE,
248 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
251 dev_err(&port->dev, "Sending USB device request code %d "
252 "failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST,
255 if (port && C_CRTSCTS(tty))
258 dbg("set_baud_rate: send second control message, data = %02X",
260 buf[0] = cts_enable_byte;
261 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
262 MCT_U232_SET_CTS_REQUEST,
263 MCT_U232_SET_REQUEST_TYPE,
264 0, 0, buf, MCT_U232_SET_CTS_SIZE,
267 dev_err(&port->dev, "Sending USB device request code %d "
268 "failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
272 } /* mct_u232_set_baud_rate */
274 static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
279 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
284 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
285 MCT_U232_SET_LINE_CTRL_REQUEST,
286 MCT_U232_SET_REQUEST_TYPE,
287 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
290 dev_err(&serial->dev->dev,
291 "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
292 dbg("set_line_ctrl: 0x%x", lcr);
295 } /* mct_u232_set_line_ctrl */
297 static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
298 unsigned int control_state)
304 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
308 mcr = MCT_U232_MCR_NONE;
309 if (control_state & TIOCM_DTR)
310 mcr |= MCT_U232_MCR_DTR;
311 if (control_state & TIOCM_RTS)
312 mcr |= MCT_U232_MCR_RTS;
315 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
316 MCT_U232_SET_MODEM_CTRL_REQUEST,
317 MCT_U232_SET_REQUEST_TYPE,
318 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
321 dev_err(&serial->dev->dev,
322 "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
323 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,
335 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
340 rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
341 MCT_U232_GET_MODEM_STAT_REQUEST,
342 MCT_U232_GET_REQUEST_TYPE,
343 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
346 dev_err(&serial->dev->dev,
347 "Get MODEM STATus failed (error = %d)\n", rc);
352 dbg("get_modem_stat: 0x%x", *msr);
355 } /* mct_u232_get_modem_stat */
357 static void mct_u232_msr_to_icount(struct async_icount *icount,
360 /* Translate Control Line states */
361 if (msr & MCT_U232_MSR_DDSR)
363 if (msr & MCT_U232_MSR_DCTS)
365 if (msr & MCT_U232_MSR_DRI)
367 if (msr & MCT_U232_MSR_DCD)
369 } /* mct_u232_msr_to_icount */
371 static void mct_u232_msr_to_state(unsigned int *control_state,
374 /* Translate Control Line states */
375 if (msr & MCT_U232_MSR_DSR)
376 *control_state |= TIOCM_DSR;
378 *control_state &= ~TIOCM_DSR;
379 if (msr & MCT_U232_MSR_CTS)
380 *control_state |= TIOCM_CTS;
382 *control_state &= ~TIOCM_CTS;
383 if (msr & MCT_U232_MSR_RI)
384 *control_state |= TIOCM_RI;
386 *control_state &= ~TIOCM_RI;
387 if (msr & MCT_U232_MSR_CD)
388 *control_state |= TIOCM_CD;
390 *control_state &= ~TIOCM_CD;
391 dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state);
392 } /* mct_u232_msr_to_state */
395 * Driver's tty interface functions
398 static int mct_u232_startup(struct usb_serial *serial)
400 struct mct_u232_private *priv;
401 struct usb_serial_port *port, *rport;
403 priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
406 spin_lock_init(&priv->lock);
407 init_waitqueue_head(&priv->msr_wait);
408 usb_set_serial_port_data(serial->port[0], priv);
410 init_waitqueue_head(&serial->port[0]->write_wait);
412 /* Puh, that's dirty */
413 port = serial->port[0];
414 rport = serial->port[1];
415 /* No unlinking, it wasn't submitted yet. */
416 usb_free_urb(port->read_urb);
417 port->read_urb = rport->interrupt_in_urb;
418 rport->interrupt_in_urb = NULL;
419 port->read_urb->context = port;
422 } /* mct_u232_startup */
425 static void mct_u232_release(struct usb_serial *serial)
427 struct mct_u232_private *priv;
432 for (i = 0; i < serial->num_ports; ++i) {
433 /* My special items, the standard routines free my urbs */
434 priv = usb_get_serial_port_data(serial->port[i]);
437 } /* mct_u232_release */
439 static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
441 struct usb_serial *serial = port->serial;
442 struct mct_u232_private *priv = usb_get_serial_port_data(port);
444 unsigned int control_state;
446 unsigned char last_lcr;
447 unsigned char last_msr;
449 dbg("%s port %d", __func__, port->number);
451 /* Compensate for a hardware bug: although the Sitecom U232-P25
452 * device reports a maximum output packet size of 32 bytes,
453 * it seems to be able to accept only 16 bytes (and that's what
454 * SniffUSB says too...)
456 if (le16_to_cpu(serial->dev->descriptor.idProduct)
457 == MCT_U232_SITECOM_PID)
458 port->bulk_out_size = 16;
460 /* Do a defined restart: the normal serial device seems to
461 * always turn on DTR and RTS here, so do the same. I'm not
462 * sure if this is really necessary. But it should not harm
465 spin_lock_irqsave(&priv->lock, flags);
466 if (tty && (tty->termios->c_cflag & CBAUD))
467 priv->control_state = TIOCM_DTR | TIOCM_RTS;
469 priv->control_state = 0;
471 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
472 MCT_U232_PARITY_NONE |
473 MCT_U232_STOP_BITS_1);
474 control_state = priv->control_state;
475 last_lcr = priv->last_lcr;
476 spin_unlock_irqrestore(&priv->lock, flags);
477 mct_u232_set_modem_ctrl(serial, control_state);
478 mct_u232_set_line_ctrl(serial, last_lcr);
480 /* Read modem status and update control state */
481 mct_u232_get_modem_stat(serial, &last_msr);
482 spin_lock_irqsave(&priv->lock, flags);
483 priv->last_msr = last_msr;
484 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
485 spin_unlock_irqrestore(&priv->lock, flags);
487 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
490 "usb_submit_urb(read bulk) failed pipe 0x%x err %d\n",
491 port->read_urb->pipe, retval);
495 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
497 usb_kill_urb(port->read_urb);
499 "usb_submit_urb(read int) failed pipe 0x%x err %d",
500 port->interrupt_in_urb->pipe, retval);
507 } /* mct_u232_open */
509 static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
511 unsigned int control_state;
512 struct mct_u232_private *priv = usb_get_serial_port_data(port);
514 mutex_lock(&port->serial->disc_mutex);
515 if (!port->serial->disconnected) {
516 /* drop DTR and RTS */
517 spin_lock_irq(&priv->lock);
519 priv->control_state |= TIOCM_DTR | TIOCM_RTS;
521 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
522 control_state = priv->control_state;
523 spin_unlock_irq(&priv->lock);
524 mct_u232_set_modem_ctrl(port->serial, control_state);
526 mutex_unlock(&port->serial->disc_mutex);
529 static void mct_u232_close(struct usb_serial_port *port)
531 dbg("%s port %d", __func__, port->number);
533 if (port->serial->dev) {
534 /* shutdown our urbs */
535 usb_kill_urb(port->write_urb);
536 usb_kill_urb(port->read_urb);
537 usb_kill_urb(port->interrupt_in_urb);
539 } /* mct_u232_close */
542 static void mct_u232_read_int_callback(struct urb *urb)
544 struct usb_serial_port *port = urb->context;
545 struct mct_u232_private *priv = usb_get_serial_port_data(port);
546 struct usb_serial *serial = port->serial;
547 struct tty_struct *tty;
548 unsigned char *data = urb->transfer_buffer;
550 int status = urb->status;
560 /* this urb is terminated, clean up */
561 dbg("%s - urb shutting down with status: %d",
565 dbg("%s - nonzero urb status received: %d",
571 dbg("%s - bad serial pointer, exiting", __func__);
575 dbg("%s - port %d", __func__, port->number);
576 usb_serial_debug_data(debug, &port->dev, __func__,
577 urb->actual_length, data);
580 * Work-a-round: handle the 'usual' bulk-in pipe here
582 if (urb->transfer_buffer_length > 2) {
583 if (urb->actual_length) {
584 tty = tty_port_tty_get(&port->port);
586 tty_insert_flip_string(tty, data,
588 tty_flip_buffer_push(tty);
596 * The interrupt-in pipe signals exceptional conditions (modem line
597 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
599 spin_lock_irqsave(&priv->lock, flags);
600 priv->last_msr = data[MCT_U232_MSR_INDEX];
602 /* Record Control Line states */
603 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
605 mct_u232_msr_to_icount(&priv->icount, priv->last_msr);
608 /* Not yet handled. See belkin_sa.c for further information */
609 /* Now to report any errors */
610 priv->last_lsr = data[MCT_U232_LSR_INDEX];
612 * fill in the flip buffer here, but I do not know the relation
613 * to the current/next receive buffer or characters. I need
614 * to look in to this before committing any code.
616 if (priv->last_lsr & MCT_U232_LSR_ERR) {
617 tty = tty_port_tty_get(&port->port);
619 if (priv->last_lsr & MCT_U232_LSR_OE) {
622 if (priv->last_lsr & MCT_U232_LSR_PE) {
625 if (priv->last_lsr & MCT_U232_LSR_FE) {
627 /* Break Indicator */
628 if (priv->last_lsr & MCT_U232_LSR_BI) {
633 wake_up_interruptible(&priv->msr_wait);
634 spin_unlock_irqrestore(&priv->lock, flags);
636 retval = usb_submit_urb(urb, GFP_ATOMIC);
639 "%s - usb_submit_urb failed with result %d\n",
641 } /* mct_u232_read_int_callback */
643 static void mct_u232_set_termios(struct tty_struct *tty,
644 struct usb_serial_port *port,
645 struct ktermios *old_termios)
647 struct usb_serial *serial = port->serial;
648 struct mct_u232_private *priv = usb_get_serial_port_data(port);
649 struct ktermios *termios = tty->termios;
650 unsigned int cflag = termios->c_cflag;
651 unsigned int old_cflag = old_termios->c_cflag;
653 unsigned int control_state;
654 unsigned char last_lcr;
656 /* get a local copy of the current port settings */
657 spin_lock_irqsave(&priv->lock, flags);
658 control_state = priv->control_state;
659 spin_unlock_irqrestore(&priv->lock, flags);
664 * Do not attempt to cache old rates and skip settings,
665 * disconnects screw such tricks up completely.
666 * Premature optimization is the root of all evil.
669 /* reassert DTR and RTS on transition from B0 */
670 if ((old_cflag & CBAUD) == B0) {
671 dbg("%s: baud was B0", __func__);
672 control_state |= TIOCM_DTR | TIOCM_RTS;
673 mct_u232_set_modem_ctrl(serial, control_state);
676 mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty));
678 if ((cflag & CBAUD) == B0) {
679 dbg("%s: baud is B0", __func__);
680 /* Drop RTS and DTR */
681 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
682 mct_u232_set_modem_ctrl(serial, control_state);
686 * Update line control register (LCR)
691 last_lcr |= (cflag & PARODD) ?
692 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
694 last_lcr |= MCT_U232_PARITY_NONE;
696 /* set the number of data bits */
697 switch (cflag & CSIZE) {
699 last_lcr |= MCT_U232_DATA_BITS_5; break;
701 last_lcr |= MCT_U232_DATA_BITS_6; break;
703 last_lcr |= MCT_U232_DATA_BITS_7; break;
705 last_lcr |= MCT_U232_DATA_BITS_8; break;
708 "CSIZE was not CS5-CS8, using default of 8\n");
709 last_lcr |= MCT_U232_DATA_BITS_8;
713 termios->c_cflag &= ~CMSPAR;
715 /* set the number of stop bits */
716 last_lcr |= (cflag & CSTOPB) ?
717 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
719 mct_u232_set_line_ctrl(serial, last_lcr);
721 /* save off the modified port settings */
722 spin_lock_irqsave(&priv->lock, flags);
723 priv->control_state = control_state;
724 priv->last_lcr = last_lcr;
725 spin_unlock_irqrestore(&priv->lock, flags);
726 } /* mct_u232_set_termios */
728 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
730 struct usb_serial_port *port = tty->driver_data;
731 struct usb_serial *serial = port->serial;
732 struct mct_u232_private *priv = usb_get_serial_port_data(port);
736 dbg("%sstate=%d", __func__, break_state);
738 spin_lock_irqsave(&priv->lock, flags);
739 lcr = priv->last_lcr;
742 lcr |= MCT_U232_SET_BREAK;
743 spin_unlock_irqrestore(&priv->lock, flags);
745 mct_u232_set_line_ctrl(serial, lcr);
746 } /* mct_u232_break_ctl */
749 static int mct_u232_tiocmget(struct tty_struct *tty)
751 struct usb_serial_port *port = tty->driver_data;
752 struct mct_u232_private *priv = usb_get_serial_port_data(port);
753 unsigned int control_state;
758 spin_lock_irqsave(&priv->lock, flags);
759 control_state = priv->control_state;
760 spin_unlock_irqrestore(&priv->lock, flags);
762 return control_state;
765 static int mct_u232_tiocmset(struct tty_struct *tty,
766 unsigned int set, unsigned int clear)
768 struct usb_serial_port *port = tty->driver_data;
769 struct usb_serial *serial = port->serial;
770 struct mct_u232_private *priv = usb_get_serial_port_data(port);
771 unsigned int control_state;
776 spin_lock_irqsave(&priv->lock, flags);
777 control_state = priv->control_state;
780 control_state |= TIOCM_RTS;
782 control_state |= TIOCM_DTR;
783 if (clear & TIOCM_RTS)
784 control_state &= ~TIOCM_RTS;
785 if (clear & TIOCM_DTR)
786 control_state &= ~TIOCM_DTR;
788 priv->control_state = control_state;
789 spin_unlock_irqrestore(&priv->lock, flags);
790 return mct_u232_set_modem_ctrl(serial, control_state);
793 static void mct_u232_throttle(struct tty_struct *tty)
795 struct usb_serial_port *port = tty->driver_data;
796 struct mct_u232_private *priv = usb_get_serial_port_data(port);
797 unsigned int control_state;
799 dbg("%s - port %d", __func__, port->number);
801 spin_lock_irq(&priv->lock);
802 priv->rx_flags |= THROTTLED;
803 if (C_CRTSCTS(tty)) {
804 priv->control_state &= ~TIOCM_RTS;
805 control_state = priv->control_state;
806 spin_unlock_irq(&priv->lock);
807 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
809 spin_unlock_irq(&priv->lock);
813 static void mct_u232_unthrottle(struct tty_struct *tty)
815 struct usb_serial_port *port = tty->driver_data;
816 struct mct_u232_private *priv = usb_get_serial_port_data(port);
817 unsigned int control_state;
819 dbg("%s - port %d", __func__, port->number);
821 spin_lock_irq(&priv->lock);
822 if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
823 priv->rx_flags &= ~THROTTLED;
824 priv->control_state |= TIOCM_RTS;
825 control_state = priv->control_state;
826 spin_unlock_irq(&priv->lock);
827 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
829 spin_unlock_irq(&priv->lock);
833 static int mct_u232_ioctl(struct tty_struct *tty,
834 unsigned int cmd, unsigned long arg)
837 struct usb_serial_port *port = tty->driver_data;
838 struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
839 struct async_icount cnow, cprev;
842 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
848 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
850 spin_lock_irqsave(&mct_u232_port->lock, flags);
851 cprev = mct_u232_port->icount;
852 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
854 prepare_to_wait(&mct_u232_port->msr_wait,
855 &wait, TASK_INTERRUPTIBLE);
857 finish_wait(&mct_u232_port->msr_wait, &wait);
858 /* see if a signal did it */
859 if (signal_pending(current))
861 spin_lock_irqsave(&mct_u232_port->lock, flags);
862 cnow = mct_u232_port->icount;
863 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
864 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
865 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
866 return -EIO; /* no change => error */
867 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
868 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
869 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
870 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
880 static int mct_u232_get_icount(struct tty_struct *tty,
881 struct serial_icounter_struct *icount)
883 struct usb_serial_port *port = tty->driver_data;
884 struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
885 struct async_icount *ic = &mct_u232_port->icount;
888 spin_lock_irqsave(&mct_u232_port->lock, flags);
890 icount->cts = ic->cts;
891 icount->dsr = ic->dsr;
892 icount->rng = ic->rng;
893 icount->dcd = ic->dcd;
896 icount->frame = ic->frame;
897 icount->overrun = ic->overrun;
898 icount->parity = ic->parity;
899 icount->brk = ic->brk;
900 icount->buf_overrun = ic->buf_overrun;
902 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
904 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d",
905 __func__, port->number, icount->rx, icount->tx);
909 module_usb_serial_driver(mct_u232_driver, serial_drivers);
911 MODULE_AUTHOR(DRIVER_AUTHOR);
912 MODULE_DESCRIPTION(DRIVER_DESC);
913 MODULE_LICENSE("GPL");
915 module_param(debug, bool, S_IRUGO | S_IWUSR);
916 MODULE_PARM_DESC(debug, "Debug enabled or not");