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
42 * 04-May-2001 Stelian Pop
43 * - Set the maximum bulk output size for Sitecom U232-P25 model to 16 bytes
44 * instead of the device reported 32 (using 32 bytes causes many data
45 * loss, Windows driver uses 16 too).
47 * 02-May-2001 Stelian Pop
48 * - Fixed the baud calculation for Sitecom U232-P25 model
51 * - Identify version on module load.
53 * 06-Jan-2001 Cornel Ciocirlan
54 * - Added support for Sitecom U232-P25 model (Product Id 0x0230)
55 * - Added support for D-Link DU-H3SP USB BAY (Product Id 0x0200)
57 * 29-Nov-2000 Greg Kroah-Hartman
58 * - Added device id table to fit with 2.4.0-test11 structure.
59 * - took out DEAL_WITH_TWO_INT_IN_ENDPOINTS #define as it's not needed
60 * (lots of things will change if/when the usb-serial core changes to
61 * handle these issues.
63 * 27-Nov-2000 Wolfgang Grandegge
64 * A version for kernel 2.4.0-test10 released to the Linux community
65 * (via linux-usb-devel).
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 <linux/uaccess.h>
78 #include <asm/unaligned.h>
79 #include <linux/usb.h>
80 #include <linux/usb/serial.h>
81 #include <linux/serial.h>
82 #include <linux/ioctl.h>
88 #define DRIVER_VERSION "z2.1" /* Linux in-kernel version */
89 #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
90 #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
97 static int mct_u232_startup(struct usb_serial *serial);
98 static void mct_u232_release(struct usb_serial *serial);
99 static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
100 static void mct_u232_close(struct usb_serial_port *port);
101 static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
102 static void mct_u232_read_int_callback(struct urb *urb);
103 static void mct_u232_set_termios(struct tty_struct *tty,
104 struct usb_serial_port *port, struct ktermios *old);
105 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
106 static int mct_u232_tiocmget(struct tty_struct *tty);
107 static int mct_u232_tiocmset(struct tty_struct *tty,
108 unsigned int set, unsigned int clear);
109 static int mct_u232_ioctl(struct tty_struct *tty,
110 unsigned int cmd, unsigned long arg);
111 static int mct_u232_get_icount(struct tty_struct *tty,
112 struct serial_icounter_struct *icount);
113 static void mct_u232_throttle(struct tty_struct *tty);
114 static void mct_u232_unthrottle(struct tty_struct *tty);
118 * All of the device info needed for the MCT USB-RS232 converter.
120 static const 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 .dtr_rts = mct_u232_dtr_rts,
150 .throttle = mct_u232_throttle,
151 .unthrottle = mct_u232_unthrottle,
152 .read_int_callback = mct_u232_read_int_callback,
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 .release = mct_u232_release,
159 .ioctl = mct_u232_ioctl,
160 .get_icount = mct_u232_get_icount,
163 struct mct_u232_private {
165 unsigned int control_state; /* Modem Line Setting (TIOCM) */
166 unsigned char last_lcr; /* Line Control Register */
167 unsigned char last_lsr; /* Line Status Register */
168 unsigned char last_msr; /* Modem Status Register */
169 unsigned int rx_flags; /* Throttling flags */
170 struct async_icount icount;
171 wait_queue_head_t msr_wait; /* for handling sleeping while waiting
172 for msr change to happen */
175 #define THROTTLED 0x01
178 * Handle vendor specific USB requests
181 #define WDR_TIMEOUT 5000 /* default urb timeout */
184 * Later day 2.6.0-test kernels have new baud rates like B230400 which
185 * we do not know how to support. We ignore them for the moment.
187 static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
188 speed_t value, speed_t *result)
192 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
193 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
198 return 0x02; /* this one not tested */
220 /* FIXME: Can we use any divider - should we do
221 divider = 115200/value;
222 real baud = 115200/divider */
242 static int mct_u232_set_baud_rate(struct tty_struct *tty,
243 struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
245 unsigned int divisor;
248 unsigned char cts_enable_byte = 0;
251 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
255 divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
256 put_unaligned_le32(cpu_to_le32(divisor), buf);
257 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
258 MCT_U232_SET_BAUD_RATE_REQUEST,
259 MCT_U232_SET_REQUEST_TYPE,
260 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
262 if (rc < 0) /*FIXME: What value speed results */
263 dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
266 tty_encode_baud_rate(tty, speed, speed);
267 dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor);
269 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
270 always sends two extra USB 'device request' messages after the
271 'baud rate change' message. The actual functionality of the
272 request codes in these messages is not fully understood but these
273 particular codes are never seen in any operation besides a baud
274 rate change. Both of these messages send a single byte of data.
275 In the first message, the value of this byte is always zero.
277 The second message has been determined experimentally to control
278 whether data will be transmitted to a device which is not asserting
279 the 'CTS' signal. If the second message's data byte is zero, data
280 will be transmitted even if 'CTS' is not asserted (i.e. no hardware
281 flow control). if the second message's data byte is nonzero (a
282 value of 1 is used by this driver), data will not be transmitted to
283 a device which is not asserting 'CTS'.
287 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
288 MCT_U232_SET_UNKNOWN1_REQUEST,
289 MCT_U232_SET_REQUEST_TYPE,
290 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
293 dev_err(&port->dev, "Sending USB device request code %d "
294 "failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST,
297 if (port && C_CRTSCTS(tty))
300 dbg("set_baud_rate: send second control message, data = %02X",
302 buf[0] = cts_enable_byte;
303 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
304 MCT_U232_SET_CTS_REQUEST,
305 MCT_U232_SET_REQUEST_TYPE,
306 0, 0, buf, MCT_U232_SET_CTS_SIZE,
309 dev_err(&port->dev, "Sending USB device request code %d "
310 "failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
314 } /* mct_u232_set_baud_rate */
316 static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
321 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
326 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
327 MCT_U232_SET_LINE_CTRL_REQUEST,
328 MCT_U232_SET_REQUEST_TYPE,
329 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
332 dev_err(&serial->dev->dev,
333 "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
334 dbg("set_line_ctrl: 0x%x", lcr);
337 } /* mct_u232_set_line_ctrl */
339 static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
340 unsigned int control_state)
346 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
350 mcr = MCT_U232_MCR_NONE;
351 if (control_state & TIOCM_DTR)
352 mcr |= MCT_U232_MCR_DTR;
353 if (control_state & TIOCM_RTS)
354 mcr |= MCT_U232_MCR_RTS;
357 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
358 MCT_U232_SET_MODEM_CTRL_REQUEST,
359 MCT_U232_SET_REQUEST_TYPE,
360 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
364 dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
367 dev_err(&serial->dev->dev,
368 "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
372 } /* mct_u232_set_modem_ctrl */
374 static int mct_u232_get_modem_stat(struct usb_serial *serial,
380 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
385 rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
386 MCT_U232_GET_MODEM_STAT_REQUEST,
387 MCT_U232_GET_REQUEST_TYPE,
388 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
391 dev_err(&serial->dev->dev,
392 "Get MODEM STATus failed (error = %d)\n", rc);
397 dbg("get_modem_stat: 0x%x", *msr);
400 } /* mct_u232_get_modem_stat */
402 static void mct_u232_msr_to_icount(struct async_icount *icount,
405 /* Translate Control Line states */
406 if (msr & MCT_U232_MSR_DDSR)
408 if (msr & MCT_U232_MSR_DCTS)
410 if (msr & MCT_U232_MSR_DRI)
412 if (msr & MCT_U232_MSR_DCD)
414 } /* mct_u232_msr_to_icount */
416 static void mct_u232_msr_to_state(unsigned int *control_state,
419 /* Translate Control Line states */
420 if (msr & MCT_U232_MSR_DSR)
421 *control_state |= TIOCM_DSR;
423 *control_state &= ~TIOCM_DSR;
424 if (msr & MCT_U232_MSR_CTS)
425 *control_state |= TIOCM_CTS;
427 *control_state &= ~TIOCM_CTS;
428 if (msr & MCT_U232_MSR_RI)
429 *control_state |= TIOCM_RI;
431 *control_state &= ~TIOCM_RI;
432 if (msr & MCT_U232_MSR_CD)
433 *control_state |= TIOCM_CD;
435 *control_state &= ~TIOCM_CD;
436 dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state);
437 } /* mct_u232_msr_to_state */
440 * Driver's tty interface functions
443 static int mct_u232_startup(struct usb_serial *serial)
445 struct mct_u232_private *priv;
446 struct usb_serial_port *port, *rport;
448 priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
451 spin_lock_init(&priv->lock);
452 init_waitqueue_head(&priv->msr_wait);
453 usb_set_serial_port_data(serial->port[0], priv);
455 init_waitqueue_head(&serial->port[0]->write_wait);
457 /* Puh, that's dirty */
458 port = serial->port[0];
459 rport = serial->port[1];
460 /* No unlinking, it wasn't submitted yet. */
461 usb_free_urb(port->read_urb);
462 port->read_urb = rport->interrupt_in_urb;
463 rport->interrupt_in_urb = NULL;
464 port->read_urb->context = port;
467 } /* mct_u232_startup */
470 static void mct_u232_release(struct usb_serial *serial)
472 struct mct_u232_private *priv;
477 for (i = 0; i < serial->num_ports; ++i) {
478 /* My special items, the standard routines free my urbs */
479 priv = usb_get_serial_port_data(serial->port[i]);
482 } /* mct_u232_release */
484 static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
486 struct usb_serial *serial = port->serial;
487 struct mct_u232_private *priv = usb_get_serial_port_data(port);
489 unsigned int control_state;
491 unsigned char last_lcr;
492 unsigned char last_msr;
494 dbg("%s port %d", __func__, port->number);
496 /* Compensate for a hardware bug: although the Sitecom U232-P25
497 * device reports a maximum output packet size of 32 bytes,
498 * it seems to be able to accept only 16 bytes (and that's what
499 * SniffUSB says too...)
501 if (le16_to_cpu(serial->dev->descriptor.idProduct)
502 == MCT_U232_SITECOM_PID)
503 port->bulk_out_size = 16;
505 /* Do a defined restart: the normal serial device seems to
506 * always turn on DTR and RTS here, so do the same. I'm not
507 * sure if this is really necessary. But it should not harm
510 spin_lock_irqsave(&priv->lock, flags);
511 if (tty && (tty->termios->c_cflag & CBAUD))
512 priv->control_state = TIOCM_DTR | TIOCM_RTS;
514 priv->control_state = 0;
516 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
517 MCT_U232_PARITY_NONE |
518 MCT_U232_STOP_BITS_1);
519 control_state = priv->control_state;
520 last_lcr = priv->last_lcr;
521 spin_unlock_irqrestore(&priv->lock, flags);
522 mct_u232_set_modem_ctrl(serial, control_state);
523 mct_u232_set_line_ctrl(serial, last_lcr);
525 /* Read modem status and update control state */
526 mct_u232_get_modem_stat(serial, &last_msr);
527 spin_lock_irqsave(&priv->lock, flags);
528 priv->last_msr = last_msr;
529 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
530 spin_unlock_irqrestore(&priv->lock, flags);
532 port->read_urb->dev = port->serial->dev;
533 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
536 "usb_submit_urb(read bulk) failed pipe 0x%x err %d\n",
537 port->read_urb->pipe, retval);
541 port->interrupt_in_urb->dev = port->serial->dev;
542 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
544 usb_kill_urb(port->read_urb);
546 "usb_submit_urb(read int) failed pipe 0x%x err %d",
547 port->interrupt_in_urb->pipe, retval);
554 } /* mct_u232_open */
556 static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
558 unsigned int control_state;
559 struct mct_u232_private *priv = usb_get_serial_port_data(port);
561 mutex_lock(&port->serial->disc_mutex);
562 if (!port->serial->disconnected) {
563 /* drop DTR and RTS */
564 spin_lock_irq(&priv->lock);
566 priv->control_state |= TIOCM_DTR | TIOCM_RTS;
568 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
569 control_state = priv->control_state;
570 spin_unlock_irq(&priv->lock);
571 mct_u232_set_modem_ctrl(port->serial, control_state);
573 mutex_unlock(&port->serial->disc_mutex);
576 static void mct_u232_close(struct usb_serial_port *port)
578 dbg("%s port %d", __func__, port->number);
580 if (port->serial->dev) {
581 /* shutdown our urbs */
582 usb_kill_urb(port->write_urb);
583 usb_kill_urb(port->read_urb);
584 usb_kill_urb(port->interrupt_in_urb);
586 } /* mct_u232_close */
589 static void mct_u232_read_int_callback(struct urb *urb)
591 struct usb_serial_port *port = urb->context;
592 struct mct_u232_private *priv = usb_get_serial_port_data(port);
593 struct usb_serial *serial = port->serial;
594 struct tty_struct *tty;
595 unsigned char *data = urb->transfer_buffer;
597 int status = urb->status;
607 /* this urb is terminated, clean up */
608 dbg("%s - urb shutting down with status: %d",
612 dbg("%s - nonzero urb status received: %d",
618 dbg("%s - bad serial pointer, exiting", __func__);
622 dbg("%s - port %d", __func__, port->number);
623 usb_serial_debug_data(debug, &port->dev, __func__,
624 urb->actual_length, data);
627 * Work-a-round: handle the 'usual' bulk-in pipe here
629 if (urb->transfer_buffer_length > 2) {
630 if (urb->actual_length) {
631 tty = tty_port_tty_get(&port->port);
633 tty_insert_flip_string(tty, data,
635 tty_flip_buffer_push(tty);
643 * The interrupt-in pipe signals exceptional conditions (modem line
644 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
646 spin_lock_irqsave(&priv->lock, flags);
647 priv->last_msr = data[MCT_U232_MSR_INDEX];
649 /* Record Control Line states */
650 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
652 mct_u232_msr_to_icount(&priv->icount, priv->last_msr);
655 /* Not yet handled. See belkin_sa.c for further information */
656 /* Now to report any errors */
657 priv->last_lsr = data[MCT_U232_LSR_INDEX];
659 * fill in the flip buffer here, but I do not know the relation
660 * to the current/next receive buffer or characters. I need
661 * to look in to this before committing any code.
663 if (priv->last_lsr & MCT_U232_LSR_ERR) {
664 tty = tty_port_tty_get(&port->port);
666 if (priv->last_lsr & MCT_U232_LSR_OE) {
669 if (priv->last_lsr & MCT_U232_LSR_PE) {
672 if (priv->last_lsr & MCT_U232_LSR_FE) {
674 /* Break Indicator */
675 if (priv->last_lsr & MCT_U232_LSR_BI) {
680 wake_up_interruptible(&priv->msr_wait);
681 spin_unlock_irqrestore(&priv->lock, flags);
683 retval = usb_submit_urb(urb, GFP_ATOMIC);
686 "%s - usb_submit_urb failed with result %d\n",
688 } /* mct_u232_read_int_callback */
690 static void mct_u232_set_termios(struct tty_struct *tty,
691 struct usb_serial_port *port,
692 struct ktermios *old_termios)
694 struct usb_serial *serial = port->serial;
695 struct mct_u232_private *priv = usb_get_serial_port_data(port);
696 struct ktermios *termios = tty->termios;
697 unsigned int cflag = termios->c_cflag;
698 unsigned int old_cflag = old_termios->c_cflag;
700 unsigned int control_state;
701 unsigned char last_lcr;
703 /* get a local copy of the current port settings */
704 spin_lock_irqsave(&priv->lock, flags);
705 control_state = priv->control_state;
706 spin_unlock_irqrestore(&priv->lock, flags);
711 * Do not attempt to cache old rates and skip settings,
712 * disconnects screw such tricks up completely.
713 * Premature optimization is the root of all evil.
716 /* reassert DTR and RTS on transition from B0 */
717 if ((old_cflag & CBAUD) == B0) {
718 dbg("%s: baud was B0", __func__);
719 control_state |= TIOCM_DTR | TIOCM_RTS;
720 mct_u232_set_modem_ctrl(serial, control_state);
723 mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty));
725 if ((cflag & CBAUD) == B0) {
726 dbg("%s: baud is B0", __func__);
727 /* Drop RTS and DTR */
728 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
729 mct_u232_set_modem_ctrl(serial, control_state);
733 * Update line control register (LCR)
738 last_lcr |= (cflag & PARODD) ?
739 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
741 last_lcr |= MCT_U232_PARITY_NONE;
743 /* set the number of data bits */
744 switch (cflag & CSIZE) {
746 last_lcr |= MCT_U232_DATA_BITS_5; break;
748 last_lcr |= MCT_U232_DATA_BITS_6; break;
750 last_lcr |= MCT_U232_DATA_BITS_7; break;
752 last_lcr |= MCT_U232_DATA_BITS_8; break;
755 "CSIZE was not CS5-CS8, using default of 8\n");
756 last_lcr |= MCT_U232_DATA_BITS_8;
760 termios->c_cflag &= ~CMSPAR;
762 /* set the number of stop bits */
763 last_lcr |= (cflag & CSTOPB) ?
764 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
766 mct_u232_set_line_ctrl(serial, last_lcr);
768 /* save off the modified port settings */
769 spin_lock_irqsave(&priv->lock, flags);
770 priv->control_state = control_state;
771 priv->last_lcr = last_lcr;
772 spin_unlock_irqrestore(&priv->lock, flags);
773 } /* mct_u232_set_termios */
775 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
777 struct usb_serial_port *port = tty->driver_data;
778 struct usb_serial *serial = port->serial;
779 struct mct_u232_private *priv = usb_get_serial_port_data(port);
783 dbg("%sstate=%d", __func__, break_state);
785 spin_lock_irqsave(&priv->lock, flags);
786 lcr = priv->last_lcr;
789 lcr |= MCT_U232_SET_BREAK;
790 spin_unlock_irqrestore(&priv->lock, flags);
792 mct_u232_set_line_ctrl(serial, lcr);
793 } /* mct_u232_break_ctl */
796 static int mct_u232_tiocmget(struct tty_struct *tty)
798 struct usb_serial_port *port = tty->driver_data;
799 struct mct_u232_private *priv = usb_get_serial_port_data(port);
800 unsigned int control_state;
805 spin_lock_irqsave(&priv->lock, flags);
806 control_state = priv->control_state;
807 spin_unlock_irqrestore(&priv->lock, flags);
809 return control_state;
812 static int mct_u232_tiocmset(struct tty_struct *tty,
813 unsigned int set, unsigned int clear)
815 struct usb_serial_port *port = tty->driver_data;
816 struct usb_serial *serial = port->serial;
817 struct mct_u232_private *priv = usb_get_serial_port_data(port);
818 unsigned int control_state;
823 spin_lock_irqsave(&priv->lock, flags);
824 control_state = priv->control_state;
827 control_state |= TIOCM_RTS;
829 control_state |= TIOCM_DTR;
830 if (clear & TIOCM_RTS)
831 control_state &= ~TIOCM_RTS;
832 if (clear & TIOCM_DTR)
833 control_state &= ~TIOCM_DTR;
835 priv->control_state = control_state;
836 spin_unlock_irqrestore(&priv->lock, flags);
837 return mct_u232_set_modem_ctrl(serial, control_state);
840 static void mct_u232_throttle(struct tty_struct *tty)
842 struct usb_serial_port *port = tty->driver_data;
843 struct mct_u232_private *priv = usb_get_serial_port_data(port);
844 unsigned int control_state;
846 dbg("%s - port %d", __func__, port->number);
848 spin_lock_irq(&priv->lock);
849 priv->rx_flags |= THROTTLED;
850 if (C_CRTSCTS(tty)) {
851 priv->control_state &= ~TIOCM_RTS;
852 control_state = priv->control_state;
853 spin_unlock_irq(&priv->lock);
854 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
856 spin_unlock_irq(&priv->lock);
860 static void mct_u232_unthrottle(struct tty_struct *tty)
862 struct usb_serial_port *port = tty->driver_data;
863 struct mct_u232_private *priv = usb_get_serial_port_data(port);
864 unsigned int control_state;
866 dbg("%s - port %d", __func__, port->number);
868 spin_lock_irq(&priv->lock);
869 if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
870 priv->rx_flags &= ~THROTTLED;
871 priv->control_state |= TIOCM_RTS;
872 control_state = priv->control_state;
873 spin_unlock_irq(&priv->lock);
874 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
876 spin_unlock_irq(&priv->lock);
880 static int mct_u232_ioctl(struct tty_struct *tty,
881 unsigned int cmd, unsigned long arg)
884 struct usb_serial_port *port = tty->driver_data;
885 struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
886 struct async_icount cnow, cprev;
889 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
895 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
897 spin_lock_irqsave(&mct_u232_port->lock, flags);
898 cprev = mct_u232_port->icount;
899 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
901 prepare_to_wait(&mct_u232_port->msr_wait,
902 &wait, TASK_INTERRUPTIBLE);
904 finish_wait(&mct_u232_port->msr_wait, &wait);
905 /* see if a signal did it */
906 if (signal_pending(current))
908 spin_lock_irqsave(&mct_u232_port->lock, flags);
909 cnow = mct_u232_port->icount;
910 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
911 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
912 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
913 return -EIO; /* no change => error */
914 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
915 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
916 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
917 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
927 static int mct_u232_get_icount(struct tty_struct *tty,
928 struct serial_icounter_struct *icount)
930 struct usb_serial_port *port = tty->driver_data;
931 struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
932 struct async_icount *ic = &mct_u232_port->icount;
935 spin_lock_irqsave(&mct_u232_port->lock, flags);
937 icount->cts = ic->cts;
938 icount->dsr = ic->dsr;
939 icount->rng = ic->rng;
940 icount->dcd = ic->dcd;
943 icount->frame = ic->frame;
944 icount->overrun = ic->overrun;
945 icount->parity = ic->parity;
946 icount->brk = ic->brk;
947 icount->buf_overrun = ic->buf_overrun;
949 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
951 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d",
952 __func__, port->number, icount->rx, icount->tx);
956 static int __init mct_u232_init(void)
959 retval = usb_serial_register(&mct_u232_device);
961 goto failed_usb_serial_register;
962 retval = usb_register(&mct_u232_driver);
964 goto failed_usb_register;
965 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
969 usb_serial_deregister(&mct_u232_device);
970 failed_usb_serial_register:
975 static void __exit mct_u232_exit(void)
977 usb_deregister(&mct_u232_driver);
978 usb_serial_deregister(&mct_u232_device);
981 module_init(mct_u232_init);
982 module_exit(mct_u232_exit);
984 MODULE_AUTHOR(DRIVER_AUTHOR);
985 MODULE_DESCRIPTION(DRIVER_DESC);
986 MODULE_LICENSE("GPL");
988 module_param(debug, bool, S_IRUGO | S_IWUSR);
989 MODULE_PARM_DESC(debug, "Debug enabled or not");