1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
|
/*
* usb-serial driver for Quatech SSU-100
*
* based on ftdi_sio.c and the original serqt_usb.c from Quatech
*
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial_reg.h>
#include <linux/uaccess.h>
#define QT_OPEN_CLOSE_CHANNEL 0xca
#define QT_SET_GET_DEVICE 0xc2
#define QT_SET_GET_REGISTER 0xc0
#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
#define QT_SET_ATF 0xcd
#define QT_GET_SET_UART 0xc1
#define QT_TRANSFER_IN 0xc0
#define QT_HW_FLOW_CONTROL_MASK 0xc5
#define QT_SW_FLOW_CONTROL_MASK 0xc6
#define SERIAL_MSR_MASK 0xf0
#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
#define MAX_BAUD_RATE 460800
#define ATC_DISABLED 0x00
#define DUPMODE_BITS 0xc0
#define RR_BITS 0x03
#define LOOPMODE_BITS 0x41
#define RS232_MODE 0x00
#define RTSCTS_TO_CONNECTOR 0x40
#define CLKS_X4 0x02
#define FULLPWRBIT 0x00000080
#define NEXT_BOARD_POWER_BIT 0x00000004
static bool debug;
/* Version Information */
#define DRIVER_VERSION "v0.1"
#define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
#define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */
#define QUATECH_SSU100 0xC020 /* SSU100 */
static const struct usb_device_id id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_driver ssu100_driver = {
.name = "ssu100",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
};
struct ssu100_port_private {
spinlock_t status_lock;
u8 shadowLSR;
u8 shadowMSR;
wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
struct async_icount icount;
};
static void ssu100_release(struct usb_serial *serial)
{
struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);
kfree(priv);
}
static inline int ssu100_control_msg(struct usb_device *dev,
u8 request, u16 data, u16 index)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
request, 0x40, data, index,
NULL, 0, 300);
}
static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
{
u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
}
static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_DEVICE, 0xc0, 0, 0,
data, 3, 300);
}
static inline int ssu100_getregister(struct usb_device *dev,
unsigned short uart,
unsigned short reg,
u8 *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0xc0, reg,
uart, data, sizeof(*data), 300);
}
static inline int ssu100_setregister(struct usb_device *dev,
unsigned short uart,
unsigned short reg,
u16 data)
{
u16 value = (data << 8) | reg;
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0x40, value, uart,
NULL, 0, 300);
}
#define set_mctrl(dev, set) update_mctrl((dev), (set), 0)
#define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
/* these do not deal with device that have more than 1 port */
static inline int update_mctrl(struct usb_device *dev, unsigned int set,
unsigned int clear)
{
unsigned urb_value;
int result;
if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
dbg("%s - DTR|RTS not being set|cleared", __func__);
return 0; /* no change */
}
clear &= ~set; /* 'set' takes precedence over 'clear' */
urb_value = 0;
if (set & TIOCM_DTR)
urb_value |= UART_MCR_DTR;
if (set & TIOCM_RTS)
urb_value |= UART_MCR_RTS;
result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
if (result < 0)
dbg("%s Error from MODEM_CTRL urb", __func__);
return result;
}
static int ssu100_initdevice(struct usb_device *dev)
{
u8 *data;
int result = 0;
data = kzalloc(3, GFP_KERNEL);
if (!data)
return -ENOMEM;
result = ssu100_getdevice(dev, data);
if (result < 0) {
dbg("%s - get_device failed %i", __func__, result);
goto out;
}
data[1] &= ~FULLPWRBIT;
result = ssu100_setdevice(dev, data);
if (result < 0) {
dbg("%s - setdevice failed %i", __func__, result);
goto out;
}
result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
if (result < 0) {
dbg("%s - set prebuffer level failed %i", __func__, result);
goto out;
}
result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
if (result < 0) {
dbg("%s - set ATFprebuffer level failed %i", __func__, result);
goto out;
}
result = ssu100_getdevice(dev, data);
if (result < 0) {
dbg("%s - get_device failed %i", __func__, result);
goto out;
}
data[0] &= ~(RR_BITS | DUPMODE_BITS);
data[0] |= CLKS_X4;
data[1] &= ~(LOOPMODE_BITS);
data[1] |= RS232_MODE;
result = ssu100_setdevice(dev, data);
if (result < 0) {
dbg("%s - setdevice failed %i", __func__, result);
goto out;
}
out: kfree(data);
return result;
}
static void ssu100_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct usb_device *dev = port->serial
|