aboutsummaryrefslogtreecommitdiff
path: root/chardev/baum.c
blob: 3dc81d5c6c66cc0dcd87e11935ddf5706d53d5e1 (plain)
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
683
684
685
/*
 * QEMU Baum Braille Device
 *
 * Copyright (c) 2008, 2010-2011, 2016-2017 Samuel Thibault
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "chardev/char.h"
#include "qemu/module.h"
#include "qemu/timer.h"
#include "hw/usb.h"
#include "ui/console.h"
#include <brlapi.h>
#include <brlapi_constants.h>
#include <brlapi_keycodes.h>

#if 0
#define DPRINTF(fmt, ...) \
        printf(fmt, ## __VA_ARGS__)
#else
#define DPRINTF(fmt, ...)
#endif

#define ESC 0x1B

#define BAUM_REQ_DisplayData		0x01
#define BAUM_REQ_GetVersionNumber	0x05
#define BAUM_REQ_GetKeys		0x08
#define BAUM_REQ_SetMode		0x12
#define BAUM_REQ_SetProtocol		0x15
#define BAUM_REQ_GetDeviceIdentity	0x84
#define BAUM_REQ_GetSerialNumber	0x8A

#define BAUM_RSP_CellCount		0x01
#define BAUM_RSP_VersionNumber		0x05
#define BAUM_RSP_ModeSetting		0x11
#define BAUM_RSP_CommunicationChannel	0x16
#define BAUM_RSP_PowerdownSignal	0x17
#define BAUM_RSP_HorizontalSensors	0x20
#define BAUM_RSP_VerticalSensors	0x21
#define BAUM_RSP_RoutingKeys		0x22
#define BAUM_RSP_Switches		0x23
#define BAUM_RSP_TopKeys		0x24
#define BAUM_RSP_HorizontalSensor	0x25
#define BAUM_RSP_VerticalSensor		0x26
#define BAUM_RSP_RoutingKey		0x27
#define BAUM_RSP_FrontKeys6		0x28
#define BAUM_RSP_BackKeys6		0x29
#define BAUM_RSP_CommandKeys		0x2B
#define BAUM_RSP_FrontKeys10		0x2C
#define BAUM_RSP_BackKeys10		0x2D
#define BAUM_RSP_EntryKeys		0x33
#define BAUM_RSP_JoyStick		0x34
#define BAUM_RSP_ErrorCode		0x40
#define BAUM_RSP_InfoBlock		0x42
#define BAUM_RSP_DeviceIdentity		0x84
#define BAUM_RSP_SerialNumber		0x8A
#define BAUM_RSP_BluetoothName		0x8C

#define BAUM_TL1 0x01
#define BAUM_TL2 0x02
#define BAUM_TL3 0x04
#define BAUM_TR1 0x08
#define BAUM_TR2 0x10
#define BAUM_TR3 0x20

#define BUF_SIZE 256

typedef struct {
    Chardev parent;

    brlapi_handle_t *brlapi;
    int brlapi_fd;
    unsigned int x, y;
    bool deferred_init;

    uint8_t in_buf[BUF_SIZE];
    uint8_t in_buf_used;
    uint8_t out_buf[BUF_SIZE];
    uint8_t out_buf_used, out_buf_ptr;

    QEMUTimer *cellCount_timer;
} BaumChardev;

#define TYPE_CHARDEV_BRAILLE "chardev-braille"
#define BAUM_CHARDEV(obj) OBJECT_CHECK(BaumChardev, (obj), TYPE_CHARDEV_BRAILLE)

/* Let's assume NABCC by default */
enum way {
    DOTS2ASCII,
    ASCII2DOTS
};
static const uint8_t nabcc_translation[2][256] = {
#ifndef BRLAPI_DOTS
#define BRLAPI_DOTS(d1,d2,d3,d4,d5,d6,d7,d8) \
    ((d1?BRLAPI_DOT1:0)|\
     (d2?BRLAPI_DOT2:0)|\
     (d3?BRLAPI_DOT3:0)|\
     (d4?BRLAPI_DOT4:0)|\
     (d5?BRLAPI_DOT5:0)|\
     (d6?BRLAPI_DOT6:0)|\
     (d7?BRLAPI_DOT7:0)|\
     (d8?BRLAPI_DOT8:0))
#endif
#define DO(dots, ascii) \
    [DOTS2ASCII][dots] = ascii, \
    [ASCII2DOTS][ascii] = dots
    DO(0, ' '),
    DO(BRLAPI_DOTS(1, 0, 0, 0, 0, 0, 0, 0), 'a'),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 0, 0, 0, 0), 'b'),
    DO(BRLAPI_DOTS(1, 0, 0, 1, 0, 0, 0, 0), 'c'),
    DO(BRLAPI_DOTS(1, 0, 0, 1, 1, 0, 0, 0), 'd'),
    DO(BRLAPI_DOTS(1, 0, 0, 0, 1, 0, 0, 0), 'e'),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 0, 0, 0, 0), 'f'),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 0, 0, 0), 'g'),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 0, 0, 0), 'h'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 0, 0, 0), 'i'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 0, 0, 0), 'j'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 0, 0, 0), 'k'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 0, 0, 0), 'l'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 0, 0, 0), 'm'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 0, 0, 0), 'n'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 0, 0, 0), 'o'),
    DO(BRLAPI_DOTS(1, 1, 1, 1, 0, 0, 0, 0), 'p'),
    DO(BRLAPI_DOTS(1, 1, 1, 1, 1, 0, 0, 0), 'q'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 1, 0, 0, 0), 'r'),
    DO(BRLAPI_DOTS(0, 1, 1, 1, 0, 0, 0, 0), 's'),
    DO(BRLAPI_DOTS(0, 1, 1, 1, 1, 0, 0, 0), 't'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 1, 0, 0), 'u'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 1, 0, 0), 'v'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 1, 0, 0), 'w'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 1, 0, 0), 'x'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 1, 0, 0), 'y'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 1, 0, 0), 'z'),

    DO(BRLAPI_DOTS(1, 0, 0, 0, 0, 0, 1, 0), 'A'),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 0, 0, 1, 0), 'B'),
    DO(BRLAPI_DOTS(1, 0, 0, 1, 0, 0, 1, 0), 'C'),
    DO(BRLAPI_DOTS(1, 0, 0, 1, 1, 0, 1, 0), 'D'),
    DO(BRLAPI_DOTS(1, 0, 0, 0, 1, 0, 1, 0), 'E'),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 0, 0, 1, 0), 'F'),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 0, 1, 0), 'G'),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 0, 1, 0), 'H'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 0, 1, 0), 'I'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 0, 1, 0), 'J'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 0, 1, 0), 'K'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 0, 1, 0), 'L'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 0, 1, 0), 'M'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 0, 1, 0), 'N'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 0, 1, 0), 'O'),
    DO(BRLAPI_DOTS(1, 1, 1, 1, 0, 0, 1, 0), 'P'),
    DO(BRLAPI_DOTS(1, 1, 1, 1, 1, 0, 1, 0), 'Q'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 1, 0, 1, 0), 'R'),
    DO(BRLAPI_DOTS(0, 1, 1, 1, 0, 0, 1, 0), 'S'),
    DO(BRLAPI_DOTS(0, 1, 1, 1, 1, 0, 1, 0), 'T'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 1, 1, 0), 'U'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 1, 1, 0), 'V'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 1, 1, 0), 'W'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 1, 1, 0), 'X'),
    DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 1, 1, 0), 'Y'),
    DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 1, 1, 0), 'Z'),

    DO(BRLAPI_DOTS(0, 0, 1, 0, 1, 1, 0, 0), '0'),
    DO(BRLAPI_DOTS(0, 1, 0, 0, 0, 0, 0, 0), '1'),
    DO(BRLAPI_DOTS(0, 1, 1, 0, 0, 0, 0, 0), '2'),
    DO(BRLAPI_DOTS(0, 1, 0, 0, 1, 0, 0, 0), '3'),
    DO(BRLAPI_DOTS(0, 1, 0, 0, 1, 1, 0, 0), '4'),
    DO(BRLAPI_DOTS(0, 1, 0, 0, 0, 1, 0, 0), '5'),
    DO(BRLAPI_DOTS(0, 1, 1, 0, 1, 0, 0, 0), '6'),
    DO(BRLAPI_DOTS(0, 1, 1, 0, 1, 1, 0, 0), '7'),
    DO(BRLAPI_DOTS(0, 1, 1, 0, 0, 1, 0, 0), '8'),
    DO(BRLAPI_DOTS(0, 0, 1, 0, 1, 0, 0, 0), '9'),

    DO(BRLAPI_DOTS(0, 0, 0, 1, 0, 1, 0, 0), '.'),
    DO(BRLAPI_DOTS(0, 0, 1, 1, 0, 1, 0, 0), '+'),
    DO(BRLAPI_DOTS(0, 0, 1, 0, 0, 1, 0, 0), '-'),
    DO(BRLAPI_DOTS(1, 0, 0, 0, 0, 1, 0, 0), '*'),
    DO(BRLAPI_DOTS(0, 0, 1, 1, 0, 0, 0, 0), '/'),
    DO(BRLAPI_DOTS(1, 1, 1, 0, 1, 1, 0, 0), '('),
    DO(BRLAPI_DOTS(0, 1, 1, 1, 1, 1, 0, 0), ')'),

    DO(BRLAPI_DOTS(1, 1, 1, 1, 0, 1, 0, 0), '&'),
    DO(BRLAPI_DOTS(0, 0, 1, 1, 1, 1, 0, 0), '#'),

    DO(BRLAPI_DOTS(0, 0, 0, 0, 0, 1, 0, 0), ','),
    DO(BRLAPI_DOTS(0, 0, 0, 0, 1, 1, 0, 0), ';'),
    DO(BRLAPI_DOTS(1, 0, 0, 0, 1, 1, 0, 0), ':'),
    DO(BRLAPI_DOTS(0, 1, 1, 1, 0, 1, 0, 0), '!'),
    DO(BRLAPI_DOTS(1, 0, 0, 1, 1, 1, 0, 0), '?'),
    DO(BRLAPI_DOTS(0, 0, 0, 0, 1, 0, 0, 0), '"'),
    DO(BRLAPI_DOTS(0, 0, 1, 0, 0, 0, 0, 0), '\''),
    DO(BRLAPI_DOTS(0, 0, 0, 1, 0, 0, 0, 0), '`'),
    DO(BRLAPI_DOTS(0, 0, 0, 1, 1, 0, 1, 0), '^'),
    DO(BRLAPI_DOTS(0, 0, 0, 1, 1, 0, 0, 0), '~'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 1, 1, 0), '['),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 1, 1, 0), ']'),
    DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 1, 0, 0), '{'),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 1, 0, 0), '}'),
    DO(BRLAPI_DOTS(1, 1, 1, 1, 1, 1, 0, 0), '='),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 0, 1, 0, 0), '<'),
    DO(BRLAPI_DOTS(0, 0, 1, 1, 1, 0, 0, 0), '>'),
    DO(BRLAPI_DOTS(1, 1, 0, 1, 0, 1, 0, 0), '$'),
    DO(BRLAPI_DOTS(1, 0, 0, 1, 0, 1, 0, 0), '%'),
    DO(BRLAPI_DOTS(0, 0, 0, 1, 0, 0, 1, 0), '@'),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 1, 0, 0), '|'),
    DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 1, 1, 0), '\\'),
    DO(BRLAPI_DOTS(0, 0, 0, 1, 1, 1, 0, 0), '_'),
};

/* The guest OS has started discussing with us, finish initializing BrlAPI */
static int baum_deferred_init(BaumChardev *baum)
{
    int tty = BRLAPI_TTY_DEFAULT;
    QemuConsole *con;

    if (baum->deferred_init) {
        return 1;
    }

    if (brlapi__getDisplaySize(baum->brlapi, &baum->x, &baum->y) == -1) {
        brlapi_perror("baum: brlapi__getDisplaySize");
        return 0;
    }
    if (baum->y > 1) {
        baum->y = 1;
    }
    if (baum->x > 84) {
        baum->x = 84;
    }

    con = qemu_console_lookup_by_index(0);
    if (con && qemu_console_is_graphic(con)) {
        tty = qemu_console_get_window_id(con);
        if (tty == -1)
            tty = BRLAPI_TTY_DEFAULT;
    }

    if (brlapi__enterTtyMode(baum->brlapi, tty, NULL) == -1) {
        brlapi_perror("baum: brlapi__enterTtyMode");
        return 0;
    }
    baum->deferred_init = 1;
    return 1;
}

/* The serial port can receive more of our data */
static void baum_chr_accept_input(struct Chardev *chr)
{
    BaumChardev *baum = BAUM_CHARDEV(chr);
    int room, first;

    if (!baum->out_buf_used)
        return;
    room = qemu_chr_be_can_write(chr);
    if (!room)
        return;
    if (room > baum->out_buf_used)
        room = baum->out_buf_used;

    first = BUF_SIZE - baum->out_buf_ptr;
    if (room > first) {
        qemu_chr_be_write(chr, baum->out_buf + baum->out_buf_ptr, first);
        baum->out_buf_ptr = 0;
        baum->out_buf_used -= first;
        room -= first;
    }
    qemu_chr_be_write(chr, baum->out_buf + baum->out_buf_ptr, room);
    baum->out_buf_ptr += room;
    baum->out_buf_used -= room;
}

/* We want to send a packet */
static void baum_write_packet(BaumChardev *baum, const uint8_t *buf, int len)
{
    Chardev *chr = CHARDEV(baum);
    uint8_t io_buf[1 + 2 * len], *cur = io_buf;
    int room;
    *cur++ = ESC;
    while (len--)
        if ((*cur++ = *buf++) == ESC)
            *cur++ = ESC;
    room = qemu_chr_be_can_write(chr);
    len = cur - io_buf;
    if (len <= room) {
        /* Fits */
        qemu_chr_be_write(chr, io_buf, len);
    } else {
        int first;
        uint8_t out;
        /* Can't fit all, send what can be, and store the rest. */
        qemu_chr_be_write(chr, io_buf, room);
        len -= room;
        cur = io_buf + room;
        if (len > BUF_SIZE - baum->out_buf_used) {
            /* Can't even store it, drop the previous data... */
            assert(len <= BUF_SIZE);
            baum->out_buf_used = 0;
            baum->out_buf_ptr = 0;
        }
        out = baum->out_buf_ptr;
        baum->out_buf_used += len;
        first = BUF_SIZE - baum->out_buf_ptr;
        if (len > first) {
            memcpy(baum->out_buf + out, cur, first);
            out = 0;
            len -= first;
            cur += first;
        }
        memcpy(baum->out_buf + out, cur, len);
    }
}

/* Called when the other end seems to have a wrong idea of our display size */
static void baum_cellCount_timer_cb(void *opaque)
{
    BaumChardev *baum = BAUM_CHARDEV(opaque);
    uint8_t cell_count[] = { BAUM_RSP_CellCount, baum->x * baum->y };
    DPRINTF("Timeout waiting for DisplayData, sending cell count\n");
    baum_write_packet(baum, cell_count, sizeof(cell_count));
}

/* Try to interpret a whole incoming packet */
static int baum_eat_packet(BaumChardev *baum, const uint8_t *buf, int len)
{
    const uint8_t *cur = buf;
    uint8_t req = 0;

    if (!len--)
        return 0;
    if (*cur++ != ESC) {
        while (*cur != ESC) {
            if (!len--)
                return 0;
            cur++;
        }
        DPRINTF("Dropped %td bytes!\n", cur - buf);
    }

#define EAT(c) do {\
    if (!len--) \
        return 0; \
    if ((c = *cur++) == ESC) { \
        if (!len--) \
            return 0; \
        if (*cur++ != ESC) { \
            DPRINTF("Broken packet %#2x, tossing\n", req); \
            if (timer_pending(baum->cellCount_timer)) {    \
                timer_del(baum->cellCount_timer);     \
                baum_cellCount_timer_cb(baum);             \
            } \
            return (cur - 2 - buf); \
        } \
    } \
} while (0)

    EAT(req);
    switch (req) {
    case BAUM_REQ_DisplayData:
    {
        uint8_t cells[baum->x * baum->y], c;
        uint8_t text[baum->x * baum->y];
        uint8_t zero[baum->x * baum->y];
        int cursor = BRLAPI_CURSOR_OFF;
        int i;

        /* Allow 100ms to complete the DisplayData packet */
        timer_mod(baum->cellCount_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
                       NANOSECONDS_PER_SECOND / 10);
        for (i = 0; i < baum->x * baum->y ; i++) {
            EAT(c);
            cells[i] = c;
            if ((c & (BRLAPI_DOT7|BRLAPI_DOT8))
                    == (BRLAPI_DOT7|BRLAPI_DOT8)) {
                cursor = i + 1;
                c &= ~(BRLAPI_DOT7|BRLAPI_DOT8);
            }
            c = nabcc_translation[DOTS2ASCII][c];
            if (!c) {
                c = '?';
            }
            text[i] = c;
        }
        timer_del(baum->cellCount_timer);

        memset(zero, 0, sizeof(zero));

        brlapi_writeArguments_t wa = {
            .displayNumber = BRLAPI_DISPLAY_DEFAULT,
            .regionBegin = 1,
            .regionSize = baum->x * baum->y,
            .text = (char *)text,
            .textSize = baum->x * baum->y,
            .andMask = zero,
            .orMask = cells,
            .cursor = cursor,
            .charset = (char *)"ISO-8859-1",
        };

        if (brlapi__write(baum->brlapi, &wa) == -1)
            brlapi_perror("baum brlapi_write");
        break;
    }
    case BAUM_REQ_SetMode:
    {
        uint8_t mode, setting;
        DPRINTF("SetMode\n");
        EAT(mode);
        EAT(setting);
        /* ignore */
        break;
    }
    case BAUM_REQ_SetProtocol:
    {
        uint8_t protocol;
        DPRINTF("SetProtocol\n");
        EAT(protocol);
        /* ignore */
        break;
    }
    case BAUM_REQ_GetDeviceIdentity:
    {
        uint8_t identity[17] = { BAUM_RSP_DeviceIdentity,
            'B','a','u','m',' ','V','a','r','i','o' };
        DPRINTF("GetDeviceIdentity\n");
        identity[11] = '0' + baum->x / 10;
        identity[12] = '0' + baum->x % 10;
        baum_write_packet(baum, identity, sizeof(identity));
        break;
    }
    case BAUM_REQ_GetVersionNumber:
    {
        uint8_t version[] = { BAUM_RSP_VersionNumber, 1 }; /* ? */
        DPRINTF("GetVersionNumber\n");
        baum_write_packet(baum, version, sizeof(version));
        break;
    }
    case BAUM_REQ_GetSerialNumber:
    {
        uint8_t serial[] = { BAUM_RSP_SerialNumber,
            '0','0','0','0','0','0','0','0' };
        DPRINTF("GetSerialNumber\n");
        baum_write_packet(baum, serial, sizeof(serial));
        break;
    }
    case BAUM_REQ_GetKeys:
    {
        DPRINTF("Get%0#2x\n", req);
        /* ignore */
        break;
    }
    default:
        DPRINTF("unrecognized request %0#2x\n", req);
        do
            if (!len--)
                return 0;
        while (*cur++ != ESC);
        cur--;
        break;
    }
    return cur - buf;
}

/* The other end is writing some data.  Store it and try to interpret */
static int baum_chr_write(Chardev *chr, const uint8_t *buf, int len)
{
    BaumChardev *baum = BAUM_CHARDEV(chr);
    int tocopy, cur, eaten, orig_len = len;

    if (!len)
        return 0;
    if (!baum->brlapi)
        return len;
    if (!baum_deferred_init(baum))
        return len;

    while (len) {
        /* Complete our buffer as much as possible */
        tocopy = len;
        if (tocopy > BUF_SIZE - baum->in_buf_used)
            tocopy = BUF_SIZE - baum->in_buf_used;

        memcpy(baum->in_buf + baum->in_buf_used, buf, tocopy);
        baum->in_buf_used += tocopy;
        buf += tocopy;
        len -= tocopy;

        /* Interpret it as much as possible */
        cur = 0;
        while (cur < baum->in_buf_used &&
                (eaten = baum_eat_packet(baum, baum->in_buf + cur, baum->in_buf_used - cur)))
            cur += eaten;

        /* Shift the remainder */
        if (cur) {
            memmove(baum->in_buf, baum->in_buf + cur, baum->in_buf_used - cur);
            baum->in_buf_used -= cur;
        }

        /* And continue if any data left */
    }
    return orig_len;
}

/* Send the key code to the other end */
static void baum_send_key(BaumChardev *baum, uint8_t type, uint8_t value)
{
    uint8_t packet[] = { type, value };
    DPRINTF("writing key %x %x\n", type, value);
    baum_write_packet(baum, packet, sizeof(packet));
}

static void baum_send_key2(BaumChardev *baum, uint8_t type, uint8_t value,
                           uint8_t value2)
{
    uint8_t packet[] = { type, value, value2 };
    DPRINTF("writing key %x %x\n", type, value);
    baum_write_packet(baum, packet, sizeof(packet));
}

/* We got some data on the BrlAPI socket */
static void baum_chr_read(void *opaque)
{
    BaumChardev *baum = BAUM_CHARDEV(opaque);
    brlapi_keyCode_t code;
    int ret;
    if (!baum->brlapi)
        return;
    if (!baum_deferred_init(baum))
        return;
    while ((ret = brlapi__readKey(baum->brlapi, 0, &code)) == 1) {
        DPRINTF("got key %"BRLAPI_PRIxKEYCODE"\n", code);
        /* Emulate */
        switch (code & BRLAPI_KEY_TYPE_MASK) {
        case BRLAPI_KEY_TYPE_CMD:
            switch (code & BRLAPI_KEY_CMD_BLK_MASK) {
            case BRLAPI_KEY_CMD_ROUTE:
                baum_send_key(baum, BAUM_RSP_RoutingKey, (code & BRLAPI_KEY_CMD_ARG_MASK)+1);
                baum_send_key(baum, BAUM_RSP_RoutingKey, 0);
                break;
            case 0:
                switch (code & BRLAPI_KEY_CMD_ARG_MASK) {
                case BRLAPI_KEY_CMD_FWINLT:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_FWINRT:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR2);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_LNUP:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR1);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_LNDN:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR3);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_TOP:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL1|BAUM_TR1);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_BOT:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL3|BAUM_TR3);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_TOP_LEFT:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR1);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_BOT_LEFT:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR3);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_HOME:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR1|BAUM_TR3);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                case BRLAPI_KEY_CMD_PREFMENU:
                    baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL1|BAUM_TL3|BAUM_TR1);
                    baum_send_key(baum, BAUM_RSP_TopKeys, 0);
                    break;
                }
            }
            break;
        case BRLAPI_KEY_TYPE_SYM:
            {
                brlapi_keyCode_t keysym = code & BRLAPI_KEY_CODE_MASK;
                if (keysym < 0x100) {
                    uint8_t dots = nabcc_translation[ASCII2DOTS][keysym];
                    if (dots) {
                        baum_send_key2(baum, BAUM_RSP_EntryKeys, 0, dots);
                        baum_send_key2(baum, BAUM_RSP_EntryKeys, 0, 0);
                    }
                }
                break;
            }
        }
    }
    if (ret == -1 && (brlapi_errno != BRLAPI_ERROR_LIBCERR || errno != EINTR)) {
        brlapi_perror("baum: brlapi_readKey");
        brlapi__closeConnection(baum->brlapi);
        g_free(baum->brlapi);
        baum->brlapi = NULL;
    }
}

static void char_braille_finalize(Object *obj)
{
    BaumChardev *baum = BAUM_CHARDEV(obj);

    timer_free(baum->cellCount_timer);
    if (baum->brlapi) {
        brlapi__closeConnection(baum->brlapi);
        g_free(baum->brlapi);
    }
}

static void baum_chr_open(Chardev *chr,
                          ChardevBackend *backend,
                          bool *be_opened,
                          Error **errp)
{
    BaumChardev *baum = BAUM_CHARDEV(chr);
    brlapi_handle_t *handle;

    handle = g_malloc0(brlapi_getHandleSize());
    baum->brlapi = handle;

    baum->brlapi_fd = brlapi__openConnection(handle, NULL, NULL);
    if (baum->brlapi_fd == -1) {
        error_setg(errp, "brlapi__openConnection: %s",
                   brlapi_strerror(brlapi_error_location()));
        g_free(handle);
        baum->brlapi = NULL;
        return;
    }
    baum->deferred_init = 0;

    baum->cellCount_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, baum_cellCount_timer_cb, baum);

    qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
}

static void char_braille_class_init(ObjectClass *oc, void *data)
{
    ChardevClass *cc = CHARDEV_CLASS(oc);

    cc->open = baum_chr_open;
    cc->chr_write = baum_chr_write;
    cc->chr_accept_input = baum_chr_accept_input;
}

static const TypeInfo char_braille_type_info = {
    .name = TYPE_CHARDEV_BRAILLE,
    .parent = TYPE_CHARDEV,
    .instance_size = sizeof(BaumChardev),
    .instance_finalize = char_braille_finalize,
    .class_init = char_braille_class_init,
};

static void register_types(void)
{
    type_register_static(&char_braille_type_info);
}

type_init(register_types);