1/*
2 * MCT (Magic Control Technology Corp.) USB RS232 Converter Driver
3 *
4 *   Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
5 *
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.
10 *
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.
14 *
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.
17 *
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.
22 */
23
24#include <linux/kernel.h>
25#include <linux/errno.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/module.h>
31#include <linux/spinlock.h>
32#include <linux/uaccess.h>
33#include <asm/unaligned.h>
34#include <linux/usb.h>
35#include <linux/usb/serial.h>
36#include <linux/serial.h>
37#include "mct_u232.h"
38
39#define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
40#define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
41
42/*
43 * Function prototypes
44 */
45static int  mct_u232_port_probe(struct usb_serial_port *port);
46static int  mct_u232_port_remove(struct usb_serial_port *remove);
47static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
48static void mct_u232_close(struct usb_serial_port *port);
49static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
50static void mct_u232_read_int_callback(struct urb *urb);
51static void mct_u232_set_termios(struct tty_struct *tty,
52			struct usb_serial_port *port, struct ktermios *old);
53static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
54static int  mct_u232_tiocmget(struct tty_struct *tty);
55static int  mct_u232_tiocmset(struct tty_struct *tty,
56			unsigned int set, unsigned int clear);
57static void mct_u232_throttle(struct tty_struct *tty);
58static void mct_u232_unthrottle(struct tty_struct *tty);
59
60
61/*
62 * All of the device info needed for the MCT USB-RS232 converter.
63 */
64static const struct usb_device_id id_table[] = {
65	{ USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
66	{ USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
67	{ USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
68	{ USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
69	{ }		/* Terminating entry */
70};
71MODULE_DEVICE_TABLE(usb, id_table);
72
73static struct usb_serial_driver mct_u232_device = {
74	.driver = {
75		.owner =	THIS_MODULE,
76		.name =		"mct_u232",
77	},
78	.description =	     "MCT U232",
79	.id_table =	     id_table,
80	.num_ports =	     1,
81	.open =		     mct_u232_open,
82	.close =	     mct_u232_close,
83	.dtr_rts =	     mct_u232_dtr_rts,
84	.throttle =	     mct_u232_throttle,
85	.unthrottle =	     mct_u232_unthrottle,
86	.read_int_callback = mct_u232_read_int_callback,
87	.set_termios =	     mct_u232_set_termios,
88	.break_ctl =	     mct_u232_break_ctl,
89	.tiocmget =	     mct_u232_tiocmget,
90	.tiocmset =	     mct_u232_tiocmset,
91	.tiocmiwait =        usb_serial_generic_tiocmiwait,
92	.port_probe =        mct_u232_port_probe,
93	.port_remove =       mct_u232_port_remove,
94	.get_icount =        usb_serial_generic_get_icount,
95};
96
97static struct usb_serial_driver * const serial_drivers[] = {
98	&mct_u232_device, NULL
99};
100
101struct mct_u232_private {
102	struct urb *read_urb;
103	spinlock_t lock;
104	unsigned int	     control_state; /* Modem Line Setting (TIOCM) */
105	unsigned char        last_lcr;      /* Line Control Register */
106	unsigned char	     last_lsr;      /* Line Status Register */
107	unsigned char	     last_msr;      /* Modem Status Register */
108	unsigned int	     rx_flags;      /* Throttling flags */
109};
110
111#define THROTTLED		0x01
112
113/*
114 * Handle vendor specific USB requests
115 */
116
117#define WDR_TIMEOUT 5000 /* default urb timeout */
118
119/*
120 * Later day 2.6.0-test kernels have new baud rates like B230400 which
121 * we do not know how to support. We ignore them for the moment.
122 */
123static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
124					speed_t value, speed_t *result)
125{
126	*result = value;
127
128	if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
129		|| le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
130		switch (value) {
131		case 300:
132			return 0x01;
133		case 600:
134			return 0x02; /* this one not tested */
135		case 1200:
136			return 0x03;
137		case 2400:
138			return 0x04;
139		case 4800:
140			return 0x06;
141		case 9600:
142			return 0x08;
143		case 19200:
144			return 0x09;
145		case 38400:
146			return 0x0a;
147		case 57600:
148			return 0x0b;
149		case 115200:
150			return 0x0c;
151		default:
152			*result = 9600;
153			return 0x08;
154		}
155	} else {
156		/* FIXME: Can we use any divider - should we do
157		   divider = 115200/value;
158		   real baud = 115200/divider */
159		switch (value) {
160		case 300: break;
161		case 600: break;
162		case 1200: break;
163		case 2400: break;
164		case 4800: break;
165		case 9600: break;
166		case 19200: break;
167		case 38400: break;
168		case 57600: break;
169		case 115200: break;
170		default:
171			value = 9600;
172			*result = 9600;
173		}
174		return 115200/value;
175	}
176}
177
178static int mct_u232_set_baud_rate(struct tty_struct *tty,
179	struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
180{
181	unsigned int divisor;
182	int rc;
183	unsigned char *buf;
184	unsigned char cts_enable_byte = 0;
185	speed_t speed;
186
187	buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
188	if (buf == NULL)
189		return -ENOMEM;
190
191	divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
192	put_unaligned_le32(cpu_to_le32(divisor), buf);
193	rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
194				MCT_U232_SET_BAUD_RATE_REQUEST,
195				MCT_U232_SET_REQUEST_TYPE,
196				0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
197				WDR_TIMEOUT);
198	if (rc < 0)	/*FIXME: What value speed results */
199		dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
200			value, rc);
201	else
202		tty_encode_baud_rate(tty, speed, speed);
203	dev_dbg(&port->dev, "set_baud_rate: value: 0x%x, divisor: 0x%x\n", value, divisor);
204
205	/* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
206	   always sends two extra USB 'device request' messages after the
207	   'baud rate change' message.  The actual functionality of the
208	   request codes in these messages is not fully understood but these
209	   particular codes are never seen in any operation besides a baud
210	   rate change.  Both of these messages send a single byte of data.
211	   In the first message, the value of this byte is always zero.
212
213	   The second message has been determined experimentally to control
214	   whether data will be transmitted to a device which is not asserting
215	   the 'CTS' signal.  If the second message's data byte is zero, data
216	   will be transmitted even if 'CTS' is not asserted (i.e. no hardware
217	   flow control).  if the second message's data byte is nonzero (a
218	   value of 1 is used by this driver), data will not be transmitted to
219	   a device which is not asserting 'CTS'.
220	*/
221
222	buf[0] = 0;
223	rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
224				MCT_U232_SET_UNKNOWN1_REQUEST,
225				MCT_U232_SET_REQUEST_TYPE,
226				0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
227				WDR_TIMEOUT);
228	if (rc < 0)
229		dev_err(&port->dev, "Sending USB device request code %d "
230			"failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST,
231			rc);
232
233	if (port && C_CRTSCTS(tty))
234	   cts_enable_byte = 1;
235
236	dev_dbg(&port->dev, "set_baud_rate: send second control message, data = %02X\n",
237		cts_enable_byte);
238	buf[0] = cts_enable_byte;
239	rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
240			MCT_U232_SET_CTS_REQUEST,
241			MCT_U232_SET_REQUEST_TYPE,
242			0, 0, buf, MCT_U232_SET_CTS_SIZE,
243			WDR_TIMEOUT);
244	if (rc < 0)
245		dev_err(&port->dev, "Sending USB device request code %d "
246			"failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
247
248	kfree(buf);
249	return rc;
250} /* mct_u232_set_baud_rate */
251
252static int mct_u232_set_line_ctrl(struct usb_serial_port *port,
253				  unsigned char lcr)
254{
255	int rc;
256	unsigned char *buf;
257
258	buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
259	if (buf == NULL)
260		return -ENOMEM;
261
262	buf[0] = lcr;
263	rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
264			MCT_U232_SET_LINE_CTRL_REQUEST,
265			MCT_U232_SET_REQUEST_TYPE,
266			0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
267			WDR_TIMEOUT);
268	if (rc < 0)
269		dev_err(&port->dev, "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
270	dev_dbg(&port->dev, "set_line_ctrl: 0x%x\n", lcr);
271	kfree(buf);
272	return rc;
273} /* mct_u232_set_line_ctrl */
274
275static int mct_u232_set_modem_ctrl(struct usb_serial_port *port,
276				   unsigned int control_state)
277{
278	int rc;
279	unsigned char mcr;
280	unsigned char *buf;
281
282	buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
283	if (buf == NULL)
284		return -ENOMEM;
285
286	mcr = MCT_U232_MCR_NONE;
287	if (control_state & TIOCM_DTR)
288		mcr |= MCT_U232_MCR_DTR;
289	if (control_state & TIOCM_RTS)
290		mcr |= MCT_U232_MCR_RTS;
291
292	buf[0] = mcr;
293	rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
294			MCT_U232_SET_MODEM_CTRL_REQUEST,
295			MCT_U232_SET_REQUEST_TYPE,
296			0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
297			WDR_TIMEOUT);
298	kfree(buf);
299
300	dev_dbg(&port->dev, "set_modem_ctrl: state=0x%x ==> mcr=0x%x\n", control_state, mcr);
301
302	if (rc < 0) {
303		dev_err(&port->dev, "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
304		return rc;
305	}
306	return 0;
307} /* mct_u232_set_modem_ctrl */
308
309static int mct_u232_get_modem_stat(struct usb_serial_port *port,
310				   unsigned char *msr)
311{
312	int rc;
313	unsigned char *buf;
314
315	buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
316	if (buf == NULL) {
317		*msr = 0;
318		return -ENOMEM;
319	}
320	rc = usb_control_msg(port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
321			MCT_U232_GET_MODEM_STAT_REQUEST,
322			MCT_U232_GET_REQUEST_TYPE,
323			0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
324			WDR_TIMEOUT);
325	if (rc < 0) {
326		dev_err(&port->dev, "Get MODEM STATus failed (error = %d)\n", rc);
327		*msr = 0;
328	} else {
329		*msr = buf[0];
330	}
331	dev_dbg(&port->dev, "get_modem_stat: 0x%x\n", *msr);
332	kfree(buf);
333	return rc;
334} /* mct_u232_get_modem_stat */
335
336static void mct_u232_msr_to_icount(struct async_icount *icount,
337						unsigned char msr)
338{
339	/* Translate Control Line states */
340	if (msr & MCT_U232_MSR_DDSR)
341		icount->dsr++;
342	if (msr & MCT_U232_MSR_DCTS)
343		icount->cts++;
344	if (msr & MCT_U232_MSR_DRI)
345		icount->rng++;
346	if (msr & MCT_U232_MSR_DCD)
347		icount->dcd++;
348} /* mct_u232_msr_to_icount */
349
350static void mct_u232_msr_to_state(struct usb_serial_port *port,
351				  unsigned int *control_state, unsigned char msr)
352{
353	/* Translate Control Line states */
354	if (msr & MCT_U232_MSR_DSR)
355		*control_state |=  TIOCM_DSR;
356	else
357		*control_state &= ~TIOCM_DSR;
358	if (msr & MCT_U232_MSR_CTS)
359		*control_state |=  TIOCM_CTS;
360	else
361		*control_state &= ~TIOCM_CTS;
362	if (msr & MCT_U232_MSR_RI)
363		*control_state |=  TIOCM_RI;
364	else
365		*control_state &= ~TIOCM_RI;
366	if (msr & MCT_U232_MSR_CD)
367		*control_state |=  TIOCM_CD;
368	else
369		*control_state &= ~TIOCM_CD;
370	dev_dbg(&port->dev, "msr_to_state: msr=0x%x ==> state=0x%x\n", msr, *control_state);
371} /* mct_u232_msr_to_state */
372
373/*
374 * Driver's tty interface functions
375 */
376
377static int mct_u232_port_probe(struct usb_serial_port *port)
378{
379	struct usb_serial *serial = port->serial;
380	struct mct_u232_private *priv;
381
382	/* check first to simplify error handling */
383	if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) {
384		dev_err(&port->dev, "expected endpoint missing\n");
385		return -ENODEV;
386	}
387
388	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
389	if (!priv)
390		return -ENOMEM;
391
392	/* Use second interrupt-in endpoint for reading. */
393	priv->read_urb = serial->port[1]->interrupt_in_urb;
394	priv->read_urb->context = port;
395
396	spin_lock_init(&priv->lock);
397
398	usb_set_serial_port_data(port, priv);
399
400	return 0;
401}
402
403static int mct_u232_port_remove(struct usb_serial_port *port)
404{
405	struct mct_u232_private *priv;
406
407	priv = usb_get_serial_port_data(port);
408	kfree(priv);
409
410	return 0;
411}
412
413static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
414{
415	struct usb_serial *serial = port->serial;
416	struct mct_u232_private *priv = usb_get_serial_port_data(port);
417	int retval = 0;
418	unsigned int control_state;
419	unsigned long flags;
420	unsigned char last_lcr;
421	unsigned char last_msr;
422
423	/* Compensate for a hardware bug: although the Sitecom U232-P25
424	 * device reports a maximum output packet size of 32 bytes,
425	 * it seems to be able to accept only 16 bytes (and that's what
426	 * SniffUSB says too...)
427	 */
428	if (le16_to_cpu(serial->dev->descriptor.idProduct)
429						== MCT_U232_SITECOM_PID)
430		port->bulk_out_size = 16;
431
432	/* Do a defined restart: the normal serial device seems to
433	 * always turn on DTR and RTS here, so do the same. I'm not
434	 * sure if this is really necessary. But it should not harm
435	 * either.
436	 */
437	spin_lock_irqsave(&priv->lock, flags);
438	if (tty && (tty->termios.c_cflag & CBAUD))
439		priv->control_state = TIOCM_DTR | TIOCM_RTS;
440	else
441		priv->control_state = 0;
442
443	priv->last_lcr = (MCT_U232_DATA_BITS_8 |
444			  MCT_U232_PARITY_NONE |
445			  MCT_U232_STOP_BITS_1);
446	control_state = priv->control_state;
447	last_lcr = priv->last_lcr;
448	spin_unlock_irqrestore(&priv->lock, flags);
449	mct_u232_set_modem_ctrl(port, control_state);
450	mct_u232_set_line_ctrl(port, last_lcr);
451
452	/* Read modem status and update control state */
453	mct_u232_get_modem_stat(port, &last_msr);
454	spin_lock_irqsave(&priv->lock, flags);
455	priv->last_msr = last_msr;
456	mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
457	spin_unlock_irqrestore(&priv->lock, flags);
458
459	retval = usb_submit_urb(priv->read_urb, GFP_KERNEL);
460	if (retval) {
461		dev_err(&port->dev,
462			"usb_submit_urb(read) failed pipe 0x%x err %d\n",
463			port->read_urb->pipe, retval);
464		goto error;
465	}
466
467	retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
468	if (retval) {
469		usb_kill_urb(priv->read_urb);
470		dev_err(&port->dev,
471			"usb_submit_urb(read int) failed pipe 0x%x err %d",
472			port->interrupt_in_urb->pipe, retval);
473		goto error;
474	}
475	return 0;
476
477error:
478	return retval;
479} /* mct_u232_open */
480
481static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
482{
483	unsigned int control_state;
484	struct mct_u232_private *priv = usb_get_serial_port_data(port);
485
486	spin_lock_irq(&priv->lock);
487	if (on)
488		priv->control_state |= TIOCM_DTR | TIOCM_RTS;
489	else
490		priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
491	control_state = priv->control_state;
492	spin_unlock_irq(&priv->lock);
493
494	mct_u232_set_modem_ctrl(port, control_state);
495}
496
497static void mct_u232_close(struct usb_serial_port *port)
498{
499	struct mct_u232_private *priv = usb_get_serial_port_data(port);
500
501	usb_kill_urb(priv->read_urb);
502	usb_kill_urb(port->interrupt_in_urb);
503
504	usb_serial_generic_close(port);
505} /* mct_u232_close */
506
507
508static void mct_u232_read_int_callback(struct urb *urb)
509{
510	struct usb_serial_port *port = urb->context;
511	struct mct_u232_private *priv = usb_get_serial_port_data(port);
512	unsigned char *data = urb->transfer_buffer;
513	int retval;
514	int status = urb->status;
515	unsigned long flags;
516
517	switch (status) {
518	case 0:
519		/* success */
520		break;
521	case -ECONNRESET:
522	case -ENOENT:
523	case -ESHUTDOWN:
524		/* this urb is terminated, clean up */
525		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
526			__func__, status);
527		return;
528	default:
529		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
530			__func__, status);
531		goto exit;
532	}
533
534	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
535
536	/*
537	 * Work-a-round: handle the 'usual' bulk-in pipe here
538	 */
539	if (urb->transfer_buffer_length > 2) {
540		if (urb->actual_length) {
541			tty_insert_flip_string(&port->port, data,
542					urb->actual_length);
543			tty_flip_buffer_push(&port->port);
544		}
545		goto exit;
546	}
547
548	/*
549	 * The interrupt-in pipe signals exceptional conditions (modem line
550	 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
551	 */
552	spin_lock_irqsave(&priv->lock, flags);
553	priv->last_msr = data[MCT_U232_MSR_INDEX];
554
555	/* Record Control Line states */
556	mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
557
558	mct_u232_msr_to_icount(&port->icount, priv->last_msr);
559
560#if 0
561	/* Not yet handled. See belkin_sa.c for further information */
562	/* Now to report any errors */
563	priv->last_lsr = data[MCT_U232_LSR_INDEX];
564	/*
565	 * fill in the flip buffer here, but I do not know the relation
566	 * to the current/next receive buffer or characters.  I need
567	 * to look in to this before committing any code.
568	 */
569	if (priv->last_lsr & MCT_U232_LSR_ERR) {
570		tty = tty_port_tty_get(&port->port);
571		/* Overrun Error */
572		if (priv->last_lsr & MCT_U232_LSR_OE) {
573		}
574		/* Parity Error */
575		if (priv->last_lsr & MCT_U232_LSR_PE) {
576		}
577		/* Framing Error */
578		if (priv->last_lsr & MCT_U232_LSR_FE) {
579		}
580		/* Break Indicator */
581		if (priv->last_lsr & MCT_U232_LSR_BI) {
582		}
583		tty_kref_put(tty);
584	}
585#endif
586	wake_up_interruptible(&port->port.delta_msr_wait);
587	spin_unlock_irqrestore(&priv->lock, flags);
588exit:
589	retval = usb_submit_urb(urb, GFP_ATOMIC);
590	if (retval)
591		dev_err(&port->dev,
592			"%s - usb_submit_urb failed with result %d\n",
593			__func__, retval);
594} /* mct_u232_read_int_callback */
595
596static void mct_u232_set_termios(struct tty_struct *tty,
597				 struct usb_serial_port *port,
598				 struct ktermios *old_termios)
599{
600	struct usb_serial *serial = port->serial;
601	struct mct_u232_private *priv = usb_get_serial_port_data(port);
602	struct ktermios *termios = &tty->termios;
603	unsigned int cflag = termios->c_cflag;
604	unsigned int old_cflag = old_termios->c_cflag;
605	unsigned long flags;
606	unsigned int control_state;
607	unsigned char last_lcr;
608
609	/* get a local copy of the current port settings */
610	spin_lock_irqsave(&priv->lock, flags);
611	control_state = priv->control_state;
612	spin_unlock_irqrestore(&priv->lock, flags);
613	last_lcr = 0;
614
615	/*
616	 * Update baud rate.
617	 * Do not attempt to cache old rates and skip settings,
618	 * disconnects screw such tricks up completely.
619	 * Premature optimization is the root of all evil.
620	 */
621
622	/* reassert DTR and RTS on transition from B0 */
623	if ((old_cflag & CBAUD) == B0) {
624		dev_dbg(&port->dev, "%s: baud was B0\n", __func__);
625		control_state |= TIOCM_DTR | TIOCM_RTS;
626		mct_u232_set_modem_ctrl(port, control_state);
627	}
628
629	mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty));
630
631	if ((cflag & CBAUD) == B0) {
632		dev_dbg(&port->dev, "%s: baud is B0\n", __func__);
633		/* Drop RTS and DTR */
634		control_state &= ~(TIOCM_DTR | TIOCM_RTS);
635		mct_u232_set_modem_ctrl(port, control_state);
636	}
637
638	/*
639	 * Update line control register (LCR)
640	 */
641
642	/* set the parity */
643	if (cflag & PARENB)
644		last_lcr |= (cflag & PARODD) ?
645			MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
646	else
647		last_lcr |= MCT_U232_PARITY_NONE;
648
649	/* set the number of data bits */
650	switch (cflag & CSIZE) {
651	case CS5:
652		last_lcr |= MCT_U232_DATA_BITS_5; break;
653	case CS6:
654		last_lcr |= MCT_U232_DATA_BITS_6; break;
655	case CS7:
656		last_lcr |= MCT_U232_DATA_BITS_7; break;
657	case CS8:
658		last_lcr |= MCT_U232_DATA_BITS_8; break;
659	default:
660		dev_err(&port->dev,
661			"CSIZE was not CS5-CS8, using default of 8\n");
662		last_lcr |= MCT_U232_DATA_BITS_8;
663		break;
664	}
665
666	termios->c_cflag &= ~CMSPAR;
667
668	/* set the number of stop bits */
669	last_lcr |= (cflag & CSTOPB) ?
670		MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
671
672	mct_u232_set_line_ctrl(port, last_lcr);
673
674	/* save off the modified port settings */
675	spin_lock_irqsave(&priv->lock, flags);
676	priv->control_state = control_state;
677	priv->last_lcr = last_lcr;
678	spin_unlock_irqrestore(&priv->lock, flags);
679} /* mct_u232_set_termios */
680
681static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
682{
683	struct usb_serial_port *port = tty->driver_data;
684	struct mct_u232_private *priv = usb_get_serial_port_data(port);
685	unsigned char lcr;
686	unsigned long flags;
687
688	spin_lock_irqsave(&priv->lock, flags);
689	lcr = priv->last_lcr;
690
691	if (break_state)
692		lcr |= MCT_U232_SET_BREAK;
693	spin_unlock_irqrestore(&priv->lock, flags);
694
695	mct_u232_set_line_ctrl(port, lcr);
696} /* mct_u232_break_ctl */
697
698
699static int mct_u232_tiocmget(struct tty_struct *tty)
700{
701	struct usb_serial_port *port = tty->driver_data;
702	struct mct_u232_private *priv = usb_get_serial_port_data(port);
703	unsigned int control_state;
704	unsigned long flags;
705
706	spin_lock_irqsave(&priv->lock, flags);
707	control_state = priv->control_state;
708	spin_unlock_irqrestore(&priv->lock, flags);
709
710	return control_state;
711}
712
713static int mct_u232_tiocmset(struct tty_struct *tty,
714			      unsigned int set, unsigned int clear)
715{
716	struct usb_serial_port *port = tty->driver_data;
717	struct mct_u232_private *priv = usb_get_serial_port_data(port);
718	unsigned int control_state;
719	unsigned long flags;
720
721	spin_lock_irqsave(&priv->lock, flags);
722	control_state = priv->control_state;
723
724	if (set & TIOCM_RTS)
725		control_state |= TIOCM_RTS;
726	if (set & TIOCM_DTR)
727		control_state |= TIOCM_DTR;
728	if (clear & TIOCM_RTS)
729		control_state &= ~TIOCM_RTS;
730	if (clear & TIOCM_DTR)
731		control_state &= ~TIOCM_DTR;
732
733	priv->control_state = control_state;
734	spin_unlock_irqrestore(&priv->lock, flags);
735	return mct_u232_set_modem_ctrl(port, control_state);
736}
737
738static void mct_u232_throttle(struct tty_struct *tty)
739{
740	struct usb_serial_port *port = tty->driver_data;
741	struct mct_u232_private *priv = usb_get_serial_port_data(port);
742	unsigned int control_state;
743
744	spin_lock_irq(&priv->lock);
745	priv->rx_flags |= THROTTLED;
746	if (C_CRTSCTS(tty)) {
747		priv->control_state &= ~TIOCM_RTS;
748		control_state = priv->control_state;
749		spin_unlock_irq(&priv->lock);
750		mct_u232_set_modem_ctrl(port, control_state);
751	} else {
752		spin_unlock_irq(&priv->lock);
753	}
754}
755
756static void mct_u232_unthrottle(struct tty_struct *tty)
757{
758	struct usb_serial_port *port = tty->driver_data;
759	struct mct_u232_private *priv = usb_get_serial_port_data(port);
760	unsigned int control_state;
761
762	spin_lock_irq(&priv->lock);
763	if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
764		priv->rx_flags &= ~THROTTLED;
765		priv->control_state |= TIOCM_RTS;
766		control_state = priv->control_state;
767		spin_unlock_irq(&priv->lock);
768		mct_u232_set_modem_ctrl(port, control_state);
769	} else {
770		spin_unlock_irq(&priv->lock);
771	}
772}
773
774module_usb_serial_driver(serial_drivers, id_table);
775
776MODULE_AUTHOR(DRIVER_AUTHOR);
777MODULE_DESCRIPTION(DRIVER_DESC);
778MODULE_LICENSE("GPL");
779