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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 && C_BAUD(tty))
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");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * MCT (Magic Control Technology Corp.) USB RS232 Converter Driver
4 *
5 * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
6 *
7 * This program is largely derived from the Belkin USB Serial Adapter Driver
8 * (see belkin_sa.[ch]). All of the information about the device was acquired
9 * by using SniffUSB on Windows98. For technical details see mct_u232.h.
10 *
11 * William G. Greathouse and Greg Kroah-Hartman provided great help on how to
12 * do the reverse engineering and how to write a USB serial device driver.
13 *
14 * TO BE DONE, TO BE CHECKED:
15 * DTR/RTS signal handling may be incomplete or incorrect. I have mainly
16 * implemented what I have seen with SniffUSB or found in belkin_sa.c.
17 * For further TODOs check also belkin_sa.c.
18 */
19
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/slab.h>
23#include <linux/tty.h>
24#include <linux/tty_driver.h>
25#include <linux/tty_flip.h>
26#include <linux/module.h>
27#include <linux/spinlock.h>
28#include <linux/uaccess.h>
29#include <linux/unaligned.h>
30#include <linux/usb.h>
31#include <linux/usb/serial.h>
32#include <linux/serial.h>
33#include "mct_u232.h"
34
35#define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
36#define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
37
38/*
39 * Function prototypes
40 */
41static int mct_u232_port_probe(struct usb_serial_port *port);
42static void mct_u232_port_remove(struct usb_serial_port *remove);
43static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
44static void mct_u232_close(struct usb_serial_port *port);
45static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
46static void mct_u232_read_int_callback(struct urb *urb);
47static void mct_u232_set_termios(struct tty_struct *tty,
48 struct usb_serial_port *port,
49 const struct ktermios *old_termios);
50static int mct_u232_break_ctl(struct tty_struct *tty, int break_state);
51static int mct_u232_tiocmget(struct tty_struct *tty);
52static int mct_u232_tiocmset(struct tty_struct *tty,
53 unsigned int set, unsigned int clear);
54static void mct_u232_throttle(struct tty_struct *tty);
55static void mct_u232_unthrottle(struct tty_struct *tty);
56
57
58/*
59 * All of the device info needed for the MCT USB-RS232 converter.
60 */
61static const struct usb_device_id id_table[] = {
62 { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
63 { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
64 { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
65 { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
66 { } /* Terminating entry */
67};
68MODULE_DEVICE_TABLE(usb, id_table);
69
70static struct usb_serial_driver mct_u232_device = {
71 .driver = {
72 .name = "mct_u232",
73 },
74 .description = "MCT U232",
75 .id_table = id_table,
76 .num_ports = 1,
77 .open = mct_u232_open,
78 .close = mct_u232_close,
79 .dtr_rts = mct_u232_dtr_rts,
80 .throttle = mct_u232_throttle,
81 .unthrottle = mct_u232_unthrottle,
82 .read_int_callback = mct_u232_read_int_callback,
83 .set_termios = mct_u232_set_termios,
84 .break_ctl = mct_u232_break_ctl,
85 .tiocmget = mct_u232_tiocmget,
86 .tiocmset = mct_u232_tiocmset,
87 .tiocmiwait = usb_serial_generic_tiocmiwait,
88 .port_probe = mct_u232_port_probe,
89 .port_remove = mct_u232_port_remove,
90 .get_icount = usb_serial_generic_get_icount,
91};
92
93static struct usb_serial_driver * const serial_drivers[] = {
94 &mct_u232_device, NULL
95};
96
97struct mct_u232_private {
98 struct urb *read_urb;
99 spinlock_t lock;
100 unsigned int control_state; /* Modem Line Setting (TIOCM) */
101 unsigned char last_lcr; /* Line Control Register */
102 unsigned char last_lsr; /* Line Status Register */
103 unsigned char last_msr; /* Modem Status Register */
104 unsigned int rx_flags; /* Throttling flags */
105};
106
107#define THROTTLED 0x01
108
109/*
110 * Handle vendor specific USB requests
111 */
112
113#define WDR_TIMEOUT 5000 /* default urb timeout */
114
115/*
116 * Later day 2.6.0-test kernels have new baud rates like B230400 which
117 * we do not know how to support. We ignore them for the moment.
118 */
119static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
120 speed_t value, speed_t *result)
121{
122 *result = value;
123
124 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
125 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
126 switch (value) {
127 case 300:
128 return 0x01;
129 case 600:
130 return 0x02; /* this one not tested */
131 case 1200:
132 return 0x03;
133 case 2400:
134 return 0x04;
135 case 4800:
136 return 0x06;
137 case 9600:
138 return 0x08;
139 case 19200:
140 return 0x09;
141 case 38400:
142 return 0x0a;
143 case 57600:
144 return 0x0b;
145 case 115200:
146 return 0x0c;
147 default:
148 *result = 9600;
149 return 0x08;
150 }
151 } else {
152 /* FIXME: Can we use any divider - should we do
153 divider = 115200/value;
154 real baud = 115200/divider */
155 switch (value) {
156 case 300: break;
157 case 600: break;
158 case 1200: break;
159 case 2400: break;
160 case 4800: break;
161 case 9600: break;
162 case 19200: break;
163 case 38400: break;
164 case 57600: break;
165 case 115200: break;
166 default:
167 value = 9600;
168 *result = 9600;
169 }
170 return 115200/value;
171 }
172}
173
174static int mct_u232_set_baud_rate(struct tty_struct *tty,
175 struct usb_serial *serial, struct usb_serial_port *port, speed_t value)
176{
177 unsigned int divisor;
178 int rc;
179 unsigned char *buf;
180 unsigned char cts_enable_byte = 0;
181 speed_t speed;
182
183 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
184 if (buf == NULL)
185 return -ENOMEM;
186
187 divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
188 put_unaligned_le32(divisor, buf);
189 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
190 MCT_U232_SET_BAUD_RATE_REQUEST,
191 MCT_U232_SET_REQUEST_TYPE,
192 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE,
193 WDR_TIMEOUT);
194 if (rc < 0) /*FIXME: What value speed results */
195 dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n",
196 value, rc);
197 else
198 tty_encode_baud_rate(tty, speed, speed);
199 dev_dbg(&port->dev, "set_baud_rate: value: 0x%x, divisor: 0x%x\n", value, divisor);
200
201 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
202 always sends two extra USB 'device request' messages after the
203 'baud rate change' message. The actual functionality of the
204 request codes in these messages is not fully understood but these
205 particular codes are never seen in any operation besides a baud
206 rate change. Both of these messages send a single byte of data.
207 In the first message, the value of this byte is always zero.
208
209 The second message has been determined experimentally to control
210 whether data will be transmitted to a device which is not asserting
211 the 'CTS' signal. If the second message's data byte is zero, data
212 will be transmitted even if 'CTS' is not asserted (i.e. no hardware
213 flow control). if the second message's data byte is nonzero (a
214 value of 1 is used by this driver), data will not be transmitted to
215 a device which is not asserting 'CTS'.
216 */
217
218 buf[0] = 0;
219 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
220 MCT_U232_SET_UNKNOWN1_REQUEST,
221 MCT_U232_SET_REQUEST_TYPE,
222 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE,
223 WDR_TIMEOUT);
224 if (rc < 0)
225 dev_err(&port->dev, "Sending USB device request code %d "
226 "failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST,
227 rc);
228
229 if (port && C_CRTSCTS(tty))
230 cts_enable_byte = 1;
231
232 dev_dbg(&port->dev, "set_baud_rate: send second control message, data = %02X\n",
233 cts_enable_byte);
234 buf[0] = cts_enable_byte;
235 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
236 MCT_U232_SET_CTS_REQUEST,
237 MCT_U232_SET_REQUEST_TYPE,
238 0, 0, buf, MCT_U232_SET_CTS_SIZE,
239 WDR_TIMEOUT);
240 if (rc < 0)
241 dev_err(&port->dev, "Sending USB device request code %d "
242 "failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc);
243
244 kfree(buf);
245 return rc;
246} /* mct_u232_set_baud_rate */
247
248static int mct_u232_set_line_ctrl(struct usb_serial_port *port,
249 unsigned char lcr)
250{
251 int rc;
252 unsigned char *buf;
253
254 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
255 if (buf == NULL)
256 return -ENOMEM;
257
258 buf[0] = lcr;
259 rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
260 MCT_U232_SET_LINE_CTRL_REQUEST,
261 MCT_U232_SET_REQUEST_TYPE,
262 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE,
263 WDR_TIMEOUT);
264 if (rc < 0)
265 dev_err(&port->dev, "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc);
266 dev_dbg(&port->dev, "set_line_ctrl: 0x%x\n", lcr);
267 kfree(buf);
268 return rc;
269} /* mct_u232_set_line_ctrl */
270
271static int mct_u232_set_modem_ctrl(struct usb_serial_port *port,
272 unsigned int control_state)
273{
274 int rc;
275 unsigned char mcr;
276 unsigned char *buf;
277
278 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
279 if (buf == NULL)
280 return -ENOMEM;
281
282 mcr = MCT_U232_MCR_NONE;
283 if (control_state & TIOCM_DTR)
284 mcr |= MCT_U232_MCR_DTR;
285 if (control_state & TIOCM_RTS)
286 mcr |= MCT_U232_MCR_RTS;
287
288 buf[0] = mcr;
289 rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
290 MCT_U232_SET_MODEM_CTRL_REQUEST,
291 MCT_U232_SET_REQUEST_TYPE,
292 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
293 WDR_TIMEOUT);
294 kfree(buf);
295
296 dev_dbg(&port->dev, "set_modem_ctrl: state=0x%x ==> mcr=0x%x\n", control_state, mcr);
297
298 if (rc < 0) {
299 dev_err(&port->dev, "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
300 return rc;
301 }
302 return 0;
303} /* mct_u232_set_modem_ctrl */
304
305static int mct_u232_get_modem_stat(struct usb_serial_port *port,
306 unsigned char *msr)
307{
308 int rc;
309 unsigned char *buf;
310
311 buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL);
312 if (buf == NULL) {
313 *msr = 0;
314 return -ENOMEM;
315 }
316 rc = usb_control_msg(port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
317 MCT_U232_GET_MODEM_STAT_REQUEST,
318 MCT_U232_GET_REQUEST_TYPE,
319 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
320 WDR_TIMEOUT);
321 if (rc < MCT_U232_GET_MODEM_STAT_SIZE) {
322 dev_err(&port->dev, "Get MODEM STATus failed (error = %d)\n", rc);
323
324 if (rc >= 0)
325 rc = -EIO;
326
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 void 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
411static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
412{
413 struct usb_serial *serial = port->serial;
414 struct mct_u232_private *priv = usb_get_serial_port_data(port);
415 int retval = 0;
416 unsigned int control_state;
417 unsigned long flags;
418 unsigned char last_lcr;
419 unsigned char last_msr;
420
421 /* Compensate for a hardware bug: although the Sitecom U232-P25
422 * device reports a maximum output packet size of 32 bytes,
423 * it seems to be able to accept only 16 bytes (and that's what
424 * SniffUSB says too...)
425 */
426 if (le16_to_cpu(serial->dev->descriptor.idProduct)
427 == MCT_U232_SITECOM_PID)
428 port->bulk_out_size = 16;
429
430 /* Do a defined restart: the normal serial device seems to
431 * always turn on DTR and RTS here, so do the same. I'm not
432 * sure if this is really necessary. But it should not harm
433 * either.
434 */
435 spin_lock_irqsave(&priv->lock, flags);
436 if (tty && C_BAUD(tty))
437 priv->control_state = TIOCM_DTR | TIOCM_RTS;
438 else
439 priv->control_state = 0;
440
441 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
442 MCT_U232_PARITY_NONE |
443 MCT_U232_STOP_BITS_1);
444 control_state = priv->control_state;
445 last_lcr = priv->last_lcr;
446 spin_unlock_irqrestore(&priv->lock, flags);
447 mct_u232_set_modem_ctrl(port, control_state);
448 mct_u232_set_line_ctrl(port, last_lcr);
449
450 /* Read modem status and update control state */
451 mct_u232_get_modem_stat(port, &last_msr);
452 spin_lock_irqsave(&priv->lock, flags);
453 priv->last_msr = last_msr;
454 mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
455 spin_unlock_irqrestore(&priv->lock, flags);
456
457 retval = usb_submit_urb(priv->read_urb, GFP_KERNEL);
458 if (retval) {
459 dev_err(&port->dev,
460 "usb_submit_urb(read) failed pipe 0x%x err %d\n",
461 port->read_urb->pipe, retval);
462 goto error;
463 }
464
465 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
466 if (retval) {
467 usb_kill_urb(priv->read_urb);
468 dev_err(&port->dev,
469 "usb_submit_urb(read int) failed pipe 0x%x err %d",
470 port->interrupt_in_urb->pipe, retval);
471 goto error;
472 }
473 return 0;
474
475error:
476 return retval;
477} /* mct_u232_open */
478
479static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
480{
481 unsigned int control_state;
482 struct mct_u232_private *priv = usb_get_serial_port_data(port);
483
484 spin_lock_irq(&priv->lock);
485 if (on)
486 priv->control_state |= TIOCM_DTR | TIOCM_RTS;
487 else
488 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
489 control_state = priv->control_state;
490 spin_unlock_irq(&priv->lock);
491
492 mct_u232_set_modem_ctrl(port, control_state);
493}
494
495static void mct_u232_close(struct usb_serial_port *port)
496{
497 struct mct_u232_private *priv = usb_get_serial_port_data(port);
498
499 usb_kill_urb(priv->read_urb);
500 usb_kill_urb(port->interrupt_in_urb);
501
502 usb_serial_generic_close(port);
503} /* mct_u232_close */
504
505
506static void mct_u232_read_int_callback(struct urb *urb)
507{
508 struct usb_serial_port *port = urb->context;
509 struct mct_u232_private *priv = usb_get_serial_port_data(port);
510 unsigned char *data = urb->transfer_buffer;
511 int retval;
512 int status = urb->status;
513 unsigned long flags;
514
515 switch (status) {
516 case 0:
517 /* success */
518 break;
519 case -ECONNRESET:
520 case -ENOENT:
521 case -ESHUTDOWN:
522 /* this urb is terminated, clean up */
523 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
524 __func__, status);
525 return;
526 default:
527 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
528 __func__, status);
529 goto exit;
530 }
531
532 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
533
534 /*
535 * Work-a-round: handle the 'usual' bulk-in pipe here
536 */
537 if (urb->transfer_buffer_length > 2) {
538 if (urb->actual_length) {
539 tty_insert_flip_string(&port->port, data,
540 urb->actual_length);
541 tty_flip_buffer_push(&port->port);
542 }
543 goto exit;
544 }
545
546 /*
547 * The interrupt-in pipe signals exceptional conditions (modem line
548 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
549 */
550 spin_lock_irqsave(&priv->lock, flags);
551 priv->last_msr = data[MCT_U232_MSR_INDEX];
552
553 /* Record Control Line states */
554 mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr);
555
556 mct_u232_msr_to_icount(&port->icount, priv->last_msr);
557
558#if 0
559 /* Not yet handled. See belkin_sa.c for further information */
560 /* Now to report any errors */
561 priv->last_lsr = data[MCT_U232_LSR_INDEX];
562 /*
563 * fill in the flip buffer here, but I do not know the relation
564 * to the current/next receive buffer or characters. I need
565 * to look in to this before committing any code.
566 */
567 if (priv->last_lsr & MCT_U232_LSR_ERR) {
568 tty = tty_port_tty_get(&port->port);
569 /* Overrun Error */
570 if (priv->last_lsr & MCT_U232_LSR_OE) {
571 }
572 /* Parity Error */
573 if (priv->last_lsr & MCT_U232_LSR_PE) {
574 }
575 /* Framing Error */
576 if (priv->last_lsr & MCT_U232_LSR_FE) {
577 }
578 /* Break Indicator */
579 if (priv->last_lsr & MCT_U232_LSR_BI) {
580 }
581 tty_kref_put(tty);
582 }
583#endif
584 wake_up_interruptible(&port->port.delta_msr_wait);
585 spin_unlock_irqrestore(&priv->lock, flags);
586exit:
587 retval = usb_submit_urb(urb, GFP_ATOMIC);
588 if (retval)
589 dev_err(&port->dev,
590 "%s - usb_submit_urb failed with result %d\n",
591 __func__, retval);
592} /* mct_u232_read_int_callback */
593
594static void mct_u232_set_termios(struct tty_struct *tty,
595 struct usb_serial_port *port,
596 const struct ktermios *old_termios)
597{
598 struct usb_serial *serial = port->serial;
599 struct mct_u232_private *priv = usb_get_serial_port_data(port);
600 struct ktermios *termios = &tty->termios;
601 unsigned int cflag = termios->c_cflag;
602 unsigned int old_cflag = old_termios->c_cflag;
603 unsigned long flags;
604 unsigned int control_state;
605 unsigned char last_lcr;
606
607 /* get a local copy of the current port settings */
608 spin_lock_irqsave(&priv->lock, flags);
609 control_state = priv->control_state;
610 spin_unlock_irqrestore(&priv->lock, flags);
611 last_lcr = 0;
612
613 /*
614 * Update baud rate.
615 * Do not attempt to cache old rates and skip settings,
616 * disconnects screw such tricks up completely.
617 * Premature optimization is the root of all evil.
618 */
619
620 /* reassert DTR and RTS on transition from B0 */
621 if ((old_cflag & CBAUD) == B0) {
622 dev_dbg(&port->dev, "%s: baud was B0\n", __func__);
623 control_state |= TIOCM_DTR | TIOCM_RTS;
624 mct_u232_set_modem_ctrl(port, control_state);
625 }
626
627 mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty));
628
629 if ((cflag & CBAUD) == B0) {
630 dev_dbg(&port->dev, "%s: baud is B0\n", __func__);
631 /* Drop RTS and DTR */
632 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
633 mct_u232_set_modem_ctrl(port, control_state);
634 }
635
636 /*
637 * Update line control register (LCR)
638 */
639
640 /* set the parity */
641 if (cflag & PARENB)
642 last_lcr |= (cflag & PARODD) ?
643 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
644 else
645 last_lcr |= MCT_U232_PARITY_NONE;
646
647 /* set the number of data bits */
648 switch (cflag & CSIZE) {
649 case CS5:
650 last_lcr |= MCT_U232_DATA_BITS_5; break;
651 case CS6:
652 last_lcr |= MCT_U232_DATA_BITS_6; break;
653 case CS7:
654 last_lcr |= MCT_U232_DATA_BITS_7; break;
655 case CS8:
656 last_lcr |= MCT_U232_DATA_BITS_8; break;
657 default:
658 dev_err(&port->dev,
659 "CSIZE was not CS5-CS8, using default of 8\n");
660 last_lcr |= MCT_U232_DATA_BITS_8;
661 break;
662 }
663
664 termios->c_cflag &= ~CMSPAR;
665
666 /* set the number of stop bits */
667 last_lcr |= (cflag & CSTOPB) ?
668 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
669
670 mct_u232_set_line_ctrl(port, last_lcr);
671
672 /* save off the modified port settings */
673 spin_lock_irqsave(&priv->lock, flags);
674 priv->control_state = control_state;
675 priv->last_lcr = last_lcr;
676 spin_unlock_irqrestore(&priv->lock, flags);
677} /* mct_u232_set_termios */
678
679static int mct_u232_break_ctl(struct tty_struct *tty, int break_state)
680{
681 struct usb_serial_port *port = tty->driver_data;
682 struct mct_u232_private *priv = usb_get_serial_port_data(port);
683 unsigned char lcr;
684 unsigned long flags;
685
686 spin_lock_irqsave(&priv->lock, flags);
687 lcr = priv->last_lcr;
688
689 if (break_state)
690 lcr |= MCT_U232_SET_BREAK;
691 spin_unlock_irqrestore(&priv->lock, flags);
692
693 return mct_u232_set_line_ctrl(port, lcr);
694} /* mct_u232_break_ctl */
695
696
697static int mct_u232_tiocmget(struct tty_struct *tty)
698{
699 struct usb_serial_port *port = tty->driver_data;
700 struct mct_u232_private *priv = usb_get_serial_port_data(port);
701 unsigned int control_state;
702 unsigned long flags;
703
704 spin_lock_irqsave(&priv->lock, flags);
705 control_state = priv->control_state;
706 spin_unlock_irqrestore(&priv->lock, flags);
707
708 return control_state;
709}
710
711static int mct_u232_tiocmset(struct tty_struct *tty,
712 unsigned int set, unsigned int clear)
713{
714 struct usb_serial_port *port = tty->driver_data;
715 struct mct_u232_private *priv = usb_get_serial_port_data(port);
716 unsigned int control_state;
717 unsigned long flags;
718
719 spin_lock_irqsave(&priv->lock, flags);
720 control_state = priv->control_state;
721
722 if (set & TIOCM_RTS)
723 control_state |= TIOCM_RTS;
724 if (set & TIOCM_DTR)
725 control_state |= TIOCM_DTR;
726 if (clear & TIOCM_RTS)
727 control_state &= ~TIOCM_RTS;
728 if (clear & TIOCM_DTR)
729 control_state &= ~TIOCM_DTR;
730
731 priv->control_state = control_state;
732 spin_unlock_irqrestore(&priv->lock, flags);
733 return mct_u232_set_modem_ctrl(port, control_state);
734}
735
736static void mct_u232_throttle(struct tty_struct *tty)
737{
738 struct usb_serial_port *port = tty->driver_data;
739 struct mct_u232_private *priv = usb_get_serial_port_data(port);
740 unsigned int control_state;
741
742 spin_lock_irq(&priv->lock);
743 priv->rx_flags |= THROTTLED;
744 if (C_CRTSCTS(tty)) {
745 priv->control_state &= ~TIOCM_RTS;
746 control_state = priv->control_state;
747 spin_unlock_irq(&priv->lock);
748 mct_u232_set_modem_ctrl(port, control_state);
749 } else {
750 spin_unlock_irq(&priv->lock);
751 }
752}
753
754static void mct_u232_unthrottle(struct tty_struct *tty)
755{
756 struct usb_serial_port *port = tty->driver_data;
757 struct mct_u232_private *priv = usb_get_serial_port_data(port);
758 unsigned int control_state;
759
760 spin_lock_irq(&priv->lock);
761 if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
762 priv->rx_flags &= ~THROTTLED;
763 priv->control_state |= TIOCM_RTS;
764 control_state = priv->control_state;
765 spin_unlock_irq(&priv->lock);
766 mct_u232_set_modem_ctrl(port, control_state);
767 } else {
768 spin_unlock_irq(&priv->lock);
769 }
770}
771
772module_usb_serial_driver(serial_drivers, id_table);
773
774MODULE_AUTHOR(DRIVER_AUTHOR);
775MODULE_DESCRIPTION(DRIVER_DESC);
776MODULE_LICENSE("GPL");