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;
173 #define THROTTLED 0x01
176 * Handle vendor specific USB requests
179 #define WDR_TIMEOUT 5000 /* default urb timeout */
182 * Later day 2.6.0-test kernels have new baud rates like B230400 which
183 * we do not know how to support. We ignore them for the moment.
185 static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
186 speed_t value, speed_t *result)
190 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
191 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
196 return 0x02; /* this one not tested */
218 /* FIXME: Can we use any divider - should we do
219 divider = 115200/value;
220 real baud = 115200/divider */
240 static int mct_u232_set_baud_rate(struct tty_struct *tty,
241 struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
243 unsigned int divisor;
246 unsigned char cts_enable_byte = 0;
249 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
253 divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
254 put_unaligned_le32(cpu_to_le32(divisor), buf);
255 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
256 MCT_U232_SET_BAUD_RATE_REQUEST,
257 MCT_U232_SET_REQUEST_TYPE,
258 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
260 if (rc < 0) /*FIXME: What value speed results */
261 dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
264 tty_encode_baud_rate(tty, speed, speed);
265 dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor);
267 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
268 always sends two extra USB 'device request' messages after the
269 'baud rate change' message. The actual functionality of the
270 request codes in these messages is not fully understood but these
271 particular codes are never seen in any operation besides a baud
272 rate change. Both of these messages send a single byte of data.
273 In the first message, the value of this byte is always zero.
275 The second message has been determined experimentally to control
276 whether data will be transmitted to a device which is not asserting
277 the 'CTS' signal. If the second message's data byte is zero, data
278 will be transmitted even if 'CTS' is not asserted (i.e. no hardware
279 flow control). if the second message's data byte is nonzero (a
280 value of 1 is used by this driver), data will not be transmitted to
281 a device which is not asserting 'CTS'.
285 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
286 MCT_U232_SET_UNKNOWN1_REQUEST,
287 MCT_U232_SET_REQUEST_TYPE,
288 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
291 dev_err(&port->dev, "Sending USB device request code %d "
292 "failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST,
295 if (port && C_CRTSCTS(tty))
298 dbg("set_baud_rate: send second control message, data = %02X",
300 buf[0] = cts_enable_byte;
301 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
302 MCT_U232_SET_CTS_REQUEST,
303 MCT_U232_SET_REQUEST_TYPE,
304 0, 0, buf, MCT_U232_SET_CTS_SIZE,
307 dev_err(&port->dev, "Sending USB device request code %d "
308 "failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
312 } /* mct_u232_set_baud_rate */
314 static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
319 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
324 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
325 MCT_U232_SET_LINE_CTRL_REQUEST,
326 MCT_U232_SET_REQUEST_TYPE,
327 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
330 dev_err(&serial->dev->dev,
331 "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
332 dbg("set_line_ctrl: 0x%x", lcr);
335 } /* mct_u232_set_line_ctrl */
337 static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
338 unsigned int control_state)
344 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
348 mcr = MCT_U232_MCR_NONE;
349 if (control_state & TIOCM_DTR)
350 mcr |= MCT_U232_MCR_DTR;
351 if (control_state & TIOCM_RTS)
352 mcr |= MCT_U232_MCR_RTS;
355 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
356 MCT_U232_SET_MODEM_CTRL_REQUEST,
357 MCT_U232_SET_REQUEST_TYPE,
358 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
362 dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
365 dev_err(&serial->dev->dev,
366 "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
370 } /* mct_u232_set_modem_ctrl */
372 static int mct_u232_get_modem_stat(struct usb_serial *serial,
378 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
383 rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
384 MCT_U232_GET_MODEM_STAT_REQUEST,
385 MCT_U232_GET_REQUEST_TYPE,
386 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
388 if (rc < MCT_U232_GET_MODEM_STAT_SIZE) {
389 dev_err(&serial->dev->dev,
390 "Get MODEM STATus failed (error = %d)\n", rc);
399 dbg("get_modem_stat: 0x%x", *msr);
402 } /* mct_u232_get_modem_stat */
404 static void mct_u232_msr_to_icount(struct async_icount *icount,
407 /* Translate Control Line states */
408 if (msr & MCT_U232_MSR_DDSR)
410 if (msr & MCT_U232_MSR_DCTS)
412 if (msr & MCT_U232_MSR_DRI)
414 if (msr & MCT_U232_MSR_DCD)
416 } /* mct_u232_msr_to_icount */
418 static void mct_u232_msr_to_state(unsigned int *control_state,
421 /* Translate Control Line states */
422 if (msr & MCT_U232_MSR_DSR)
423 *control_state |= TIOCM_DSR;
425 *control_state &= ~TIOCM_DSR;
426 if (msr & MCT_U232_MSR_CTS)
427 *control_state |= TIOCM_CTS;
429 *control_state &= ~TIOCM_CTS;
430 if (msr & MCT_U232_MSR_RI)
431 *control_state |= TIOCM_RI;
433 *control_state &= ~TIOCM_RI;
434 if (msr & MCT_U232_MSR_CD)
435 *control_state |= TIOCM_CD;
437 *control_state &= ~TIOCM_CD;
438 dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state);
439 } /* mct_u232_msr_to_state */
442 * Driver's tty interface functions
445 static int mct_u232_startup(struct usb_serial *serial)
447 struct mct_u232_private *priv;
448 struct usb_serial_port *port, *rport;
450 /* check first to simplify error handling */
451 if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) {
452 dev_err(&port->dev, "expected endpoint missing\n");
456 priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
459 spin_lock_init(&priv->lock);
460 usb_set_serial_port_data(serial->port[0], priv);
462 init_waitqueue_head(&serial->port[0]->write_wait);
464 /* Puh, that's dirty */
465 port = serial->port[0];
466 rport = serial->port[1];
467 /* No unlinking, it wasn't submitted yet. */
468 usb_free_urb(port->read_urb);
469 port->read_urb = rport->interrupt_in_urb;
470 rport->interrupt_in_urb = NULL;
471 port->read_urb->context = port;
474 } /* mct_u232_startup */
477 static void mct_u232_release(struct usb_serial *serial)
479 struct mct_u232_private *priv;
484 for (i = 0; i < serial->num_ports; ++i) {
485 /* My special items, the standard routines free my urbs */
486 priv = usb_get_serial_port_data(serial->port[i]);
489 } /* mct_u232_release */
491 static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
493 struct usb_serial *serial = port->serial;
494 struct mct_u232_private *priv = usb_get_serial_port_data(port);
496 unsigned int control_state;
498 unsigned char last_lcr;
499 unsigned char last_msr;
501 dbg("%s port %d", __func__, port->number);
503 /* Compensate for a hardware bug: although the Sitecom U232-P25
504 * device reports a maximum output packet size of 32 bytes,
505 * it seems to be able to accept only 16 bytes (and that's what
506 * SniffUSB says too...)
508 if (le16_to_cpu(serial->dev->descriptor.idProduct)
509 == MCT_U232_SITECOM_PID)
510 port->bulk_out_size = 16;
512 /* Do a defined restart: the normal serial device seems to
513 * always turn on DTR and RTS here, so do the same. I'm not
514 * sure if this is really necessary. But it should not harm
517 spin_lock_irqsave(&priv->lock, flags);
518 if (tty && (tty->termios->c_cflag & CBAUD))
519 priv->control_state = TIOCM_DTR | TIOCM_RTS;
521 priv->control_state = 0;
523 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
524 MCT_U232_PARITY_NONE |
525 MCT_U232_STOP_BITS_1);
526 control_state = priv->control_state;
527 last_lcr = priv->last_lcr;
528 spin_unlock_irqrestore(&priv->lock, flags);
529 mct_u232_set_modem_ctrl(serial, control_state);
530 mct_u232_set_line_ctrl(serial, last_lcr);
532 /* Read modem status and update control state */
533 mct_u232_get_modem_stat(serial, &last_msr);
534 spin_lock_irqsave(&priv->lock, flags);
535 priv->last_msr = last_msr;
536 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
537 spin_unlock_irqrestore(&priv->lock, flags);
539 port->read_urb->dev = port->serial->dev;
540 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
543 "usb_submit_urb(read bulk) failed pipe 0x%x err %d\n",
544 port->read_urb->pipe, retval);
548 port->interrupt_in_urb->dev = port->serial->dev;
549 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
551 usb_kill_urb(port->read_urb);
553 "usb_submit_urb(read int) failed pipe 0x%x err %d",
554 port->interrupt_in_urb->pipe, retval);
561 } /* mct_u232_open */
563 static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
565 unsigned int control_state;
566 struct mct_u232_private *priv = usb_get_serial_port_data(port);
568 spin_lock_irq(&priv->lock);
570 priv->control_state |= TIOCM_DTR | TIOCM_RTS;
572 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
573 control_state = priv->control_state;
574 spin_unlock_irq(&priv->lock);
576 mct_u232_set_modem_ctrl(port->serial, control_state);
579 static void mct_u232_close(struct usb_serial_port *port)
581 dbg("%s port %d", __func__, port->number);
584 * Must kill the read urb as it is actually an interrupt urb, which
585 * generic close thus fails to kill.
587 usb_kill_urb(port->read_urb);
588 usb_kill_urb(port->interrupt_in_urb);
590 usb_serial_generic_close(port);
591 } /* mct_u232_close */
594 static void mct_u232_read_int_callback(struct urb *urb)
596 struct usb_serial_port *port = urb->context;
597 struct mct_u232_private *priv = usb_get_serial_port_data(port);
598 struct usb_serial *serial = port->serial;
599 struct tty_struct *tty;
600 unsigned char *data = urb->transfer_buffer;
602 int status = urb->status;
612 /* this urb is terminated, clean up */
613 dbg("%s - urb shutting down with status: %d",
617 dbg("%s - nonzero urb status received: %d",
623 dbg("%s - bad serial pointer, exiting", __func__);
627 dbg("%s - port %d", __func__, port->number);
628 usb_serial_debug_data(debug, &port->dev, __func__,
629 urb->actual_length, data);
632 * Work-a-round: handle the 'usual' bulk-in pipe here
634 if (urb->transfer_buffer_length > 2) {
635 if (urb->actual_length) {
636 tty = tty_port_tty_get(&port->port);
638 tty_insert_flip_string(tty, data,
640 tty_flip_buffer_push(tty);
648 * The interrupt-in pipe signals exceptional conditions (modem line
649 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
651 spin_lock_irqsave(&priv->lock, flags);
652 priv->last_msr = data[MCT_U232_MSR_INDEX];
654 /* Record Control Line states */
655 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
657 mct_u232_msr_to_icount(&priv->icount, priv->last_msr);
660 /* Not yet handled. See belkin_sa.c for further information */
661 /* Now to report any errors */
662 priv->last_lsr = data[MCT_U232_LSR_INDEX];
664 * fill in the flip buffer here, but I do not know the relation
665 * to the current/next receive buffer or characters. I need
666 * to look in to this before committing any code.
668 if (priv->last_lsr & MCT_U232_LSR_ERR) {
669 tty = tty_port_tty_get(&port->port);
671 if (priv->last_lsr & MCT_U232_LSR_OE) {
674 if (priv->last_lsr & MCT_U232_LSR_PE) {
677 if (priv->last_lsr & MCT_U232_LSR_FE) {
679 /* Break Indicator */
680 if (priv->last_lsr & MCT_U232_LSR_BI) {
685 wake_up_interruptible(&port->delta_msr_wait);
686 spin_unlock_irqrestore(&priv->lock, flags);
688 retval = usb_submit_urb(urb, GFP_ATOMIC);
691 "%s - usb_submit_urb failed with result %d\n",
693 } /* mct_u232_read_int_callback */
695 static void mct_u232_set_termios(struct tty_struct *tty,
696 struct usb_serial_port *port,
697 struct ktermios *old_termios)
699 struct usb_serial *serial = port->serial;
700 struct mct_u232_private *priv = usb_get_serial_port_data(port);
701 struct ktermios *termios = tty->termios;
702 unsigned int cflag = termios->c_cflag;
703 unsigned int old_cflag = old_termios->c_cflag;
705 unsigned int control_state;
706 unsigned char last_lcr;
708 /* get a local copy of the current port settings */
709 spin_lock_irqsave(&priv->lock, flags);
710 control_state = priv->control_state;
711 spin_unlock_irqrestore(&priv->lock, flags);
716 * Do not attempt to cache old rates and skip settings,
717 * disconnects screw such tricks up completely.
718 * Premature optimization is the root of all evil.
721 /* reassert DTR and RTS on transition from B0 */
722 if ((old_cflag & CBAUD) == B0) {
723 dbg("%s: baud was B0", __func__);
724 control_state |= TIOCM_DTR | TIOCM_RTS;
725 mct_u232_set_modem_ctrl(serial, control_state);
728 mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty));
730 if ((cflag & CBAUD) == B0) {
731 dbg("%s: baud is B0", __func__);
732 /* Drop RTS and DTR */
733 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
734 mct_u232_set_modem_ctrl(serial, control_state);
738 * Update line control register (LCR)
743 last_lcr |= (cflag & PARODD) ?
744 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
746 last_lcr |= MCT_U232_PARITY_NONE;
748 /* set the number of data bits */
749 switch (cflag & CSIZE) {
751 last_lcr |= MCT_U232_DATA_BITS_5; break;
753 last_lcr |= MCT_U232_DATA_BITS_6; break;
755 last_lcr |= MCT_U232_DATA_BITS_7; break;
757 last_lcr |= MCT_U232_DATA_BITS_8; break;
760 "CSIZE was not CS5-CS8, using default of 8\n");
761 last_lcr |= MCT_U232_DATA_BITS_8;
765 termios->c_cflag &= ~CMSPAR;
767 /* set the number of stop bits */
768 last_lcr |= (cflag & CSTOPB) ?
769 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
771 mct_u232_set_line_ctrl(serial, last_lcr);
773 /* save off the modified port settings */
774 spin_lock_irqsave(&priv->lock, flags);
775 priv->control_state = control_state;
776 priv->last_lcr = last_lcr;
777 spin_unlock_irqrestore(&priv->lock, flags);
778 } /* mct_u232_set_termios */
780 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
782 struct usb_serial_port *port = tty->driver_data;
783 struct usb_serial *serial = port->serial;
784 struct mct_u232_private *priv = usb_get_serial_port_data(port);
788 dbg("%sstate=%d", __func__, break_state);
790 spin_lock_irqsave(&priv->lock, flags);
791 lcr = priv->last_lcr;
794 lcr |= MCT_U232_SET_BREAK;
795 spin_unlock_irqrestore(&priv->lock, flags);
797 mct_u232_set_line_ctrl(serial, lcr);
798 } /* mct_u232_break_ctl */
801 static int mct_u232_tiocmget(struct tty_struct *tty)
803 struct usb_serial_port *port = tty->driver_data;
804 struct mct_u232_private *priv = usb_get_serial_port_data(port);
805 unsigned int control_state;
810 spin_lock_irqsave(&priv->lock, flags);
811 control_state = priv->control_state;
812 spin_unlock_irqrestore(&priv->lock, flags);
814 return control_state;
817 static int mct_u232_tiocmset(struct tty_struct *tty,
818 unsigned int set, unsigned int clear)
820 struct usb_serial_port *port = tty->driver_data;
821 struct usb_serial *serial = port->serial;
822 struct mct_u232_private *priv = usb_get_serial_port_data(port);
823 unsigned int control_state;
828 spin_lock_irqsave(&priv->lock, flags);
829 control_state = priv->control_state;
832 control_state |= TIOCM_RTS;
834 control_state |= TIOCM_DTR;
835 if (clear & TIOCM_RTS)
836 control_state &= ~TIOCM_RTS;
837 if (clear & TIOCM_DTR)
838 control_state &= ~TIOCM_DTR;
840 priv->control_state = control_state;
841 spin_unlock_irqrestore(&priv->lock, flags);
842 return mct_u232_set_modem_ctrl(serial, control_state);
845 static void mct_u232_throttle(struct tty_struct *tty)
847 struct usb_serial_port *port = tty->driver_data;
848 struct mct_u232_private *priv = usb_get_serial_port_data(port);
849 unsigned int control_state;
851 dbg("%s - port %d", __func__, port->number);
853 spin_lock_irq(&priv->lock);
854 priv->rx_flags |= THROTTLED;
855 if (C_CRTSCTS(tty)) {
856 priv->control_state &= ~TIOCM_RTS;
857 control_state = priv->control_state;
858 spin_unlock_irq(&priv->lock);
859 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
861 spin_unlock_irq(&priv->lock);
865 static void mct_u232_unthrottle(struct tty_struct *tty)
867 struct usb_serial_port *port = tty->driver_data;
868 struct mct_u232_private *priv = usb_get_serial_port_data(port);
869 unsigned int control_state;
871 dbg("%s - port %d", __func__, port->number);
873 spin_lock_irq(&priv->lock);
874 if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
875 priv->rx_flags &= ~THROTTLED;
876 priv->control_state |= TIOCM_RTS;
877 control_state = priv->control_state;
878 spin_unlock_irq(&priv->lock);
879 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
881 spin_unlock_irq(&priv->lock);
885 static int mct_u232_ioctl(struct tty_struct *tty,
886 unsigned int cmd, unsigned long arg)
889 struct usb_serial_port *port = tty->driver_data;
890 struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
891 struct async_icount cnow, cprev;
894 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
900 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
902 spin_lock_irqsave(&mct_u232_port->lock, flags);
903 cprev = mct_u232_port->icount;
904 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
906 prepare_to_wait(&port->delta_msr_wait,
907 &wait, TASK_INTERRUPTIBLE);
909 finish_wait(&port->delta_msr_wait, &wait);
910 /* see if a signal did it */
911 if (signal_pending(current))
914 if (port->serial->disconnected)
917 spin_lock_irqsave(&mct_u232_port->lock, flags);
918 cnow = mct_u232_port->icount;
919 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
920 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
921 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
922 return -EIO; /* no change => error */
923 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
924 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
925 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
926 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
936 static int mct_u232_get_icount(struct tty_struct *tty,
937 struct serial_icounter_struct *icount)
939 struct usb_serial_port *port = tty->driver_data;
940 struct mct_u232_private *mct_u232_port = usb_get_serial_port_data(port);
941 struct async_icount *ic = &mct_u232_port->icount;
944 spin_lock_irqsave(&mct_u232_port->lock, flags);
946 icount->cts = ic->cts;
947 icount->dsr = ic->dsr;
948 icount->rng = ic->rng;
949 icount->dcd = ic->dcd;
952 icount->frame = ic->frame;
953 icount->overrun = ic->overrun;
954 icount->parity = ic->parity;
955 icount->brk = ic->brk;
956 icount->buf_overrun = ic->buf_overrun;
958 spin_unlock_irqrestore(&mct_u232_port->lock, flags);
960 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d",
961 __func__, port->number, icount->rx, icount->tx);
965 static int __init mct_u232_init(void)
968 retval = usb_serial_register(&mct_u232_device);
970 goto failed_usb_serial_register;
971 retval = usb_register(&mct_u232_driver);
973 goto failed_usb_register;
974 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
978 usb_serial_deregister(&mct_u232_device);
979 failed_usb_serial_register:
984 static void __exit mct_u232_exit(void)
986 usb_deregister(&mct_u232_driver);
987 usb_serial_deregister(&mct_u232_device);
990 module_init(mct_u232_init);
991 module_exit(mct_u232_exit);
993 MODULE_AUTHOR(DRIVER_AUTHOR);
994 MODULE_DESCRIPTION(DRIVER_DESC);
995 MODULE_LICENSE("GPL");
997 module_param(debug, bool, S_IRUGO | S_IWUSR);
998 MODULE_PARM_DESC(debug, "Debug enabled or not");