chardev/baum.c

   1 /*
   2  * QEMU Baum Braille Device
   3  *
   4  * Copyright (c) 2008, 2010-2011, 2016-2017 Samuel Thibault
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qapi/error.h"
  27 #include "chardev/char.h"
  28 #include "qemu/main-loop.h"
  29 #include "qemu/module.h"
  30 #include "qemu/timer.h"
  31 #include "hw/usb.h"
  32 #include "ui/console.h"
  33 #include <brlapi.h>
  34 #include <brlapi_constants.h>
  35 #include <brlapi_keycodes.h>
  36 #include "qom/object.h"
  37
  38 #if 0
  39 #define DPRINTF(fmt, ...) \
  40         printf(fmt, ## __VA_ARGS__)
  41 #else
  42 #define DPRINTF(fmt, ...)
  43 #endif
  44
  45 #define ESC 0x1B
  46
  47 #define BAUM_REQ_DisplayData            0x01
  48 #define BAUM_REQ_GetVersionNumber       0x05
  49 #define BAUM_REQ_GetKeys                0x08
  50 #define BAUM_REQ_SetMode                0x12
  51 #define BAUM_REQ_SetProtocol            0x15
  52 #define BAUM_REQ_GetDeviceIdentity      0x84
  53 #define BAUM_REQ_GetSerialNumber        0x8A
  54
  55 #define BAUM_RSP_CellCount              0x01
  56 #define BAUM_RSP_VersionNumber          0x05
  57 #define BAUM_RSP_ModeSetting            0x11
  58 #define BAUM_RSP_CommunicationChannel   0x16
  59 #define BAUM_RSP_PowerdownSignal        0x17
  60 #define BAUM_RSP_HorizontalSensors      0x20
  61 #define BAUM_RSP_VerticalSensors        0x21
  62 #define BAUM_RSP_RoutingKeys            0x22
  63 #define BAUM_RSP_Switches               0x23
  64 #define BAUM_RSP_TopKeys                0x24
  65 #define BAUM_RSP_HorizontalSensor       0x25
  66 #define BAUM_RSP_VerticalSensor         0x26
  67 #define BAUM_RSP_RoutingKey             0x27
  68 #define BAUM_RSP_FrontKeys6             0x28
  69 #define BAUM_RSP_BackKeys6              0x29
  70 #define BAUM_RSP_CommandKeys            0x2B
  71 #define BAUM_RSP_FrontKeys10            0x2C
  72 #define BAUM_RSP_BackKeys10             0x2D
  73 #define BAUM_RSP_EntryKeys              0x33
  74 #define BAUM_RSP_JoyStick               0x34
  75 #define BAUM_RSP_ErrorCode              0x40
  76 #define BAUM_RSP_InfoBlock              0x42
  77 #define BAUM_RSP_DeviceIdentity         0x84
  78 #define BAUM_RSP_SerialNumber           0x8A
  79 #define BAUM_RSP_BluetoothName          0x8C
  80
  81 #define BAUM_TL1 0x01
  82 #define BAUM_TL2 0x02
  83 #define BAUM_TL3 0x04
  84 #define BAUM_TR1 0x08
  85 #define BAUM_TR2 0x10
  86 #define BAUM_TR3 0x20
  87
  88 #define BUF_SIZE 256
  89
  90 struct BaumChardev {
  91     Chardev parent;
  92
  93     brlapi_handle_t *brlapi;
  94     int brlapi_fd;
  95     unsigned int x, y;
  96     bool deferred_init;
  97
  98     uint8_t in_buf[BUF_SIZE];
  99     uint8_t in_buf_used;
 100     uint8_t out_buf[BUF_SIZE];
 101     uint8_t out_buf_used, out_buf_ptr;
 102
 103     QEMUTimer *cellCount_timer;
 104 };
 105 typedef struct BaumChardev BaumChardev;
 106
 107 #define TYPE_CHARDEV_BRAILLE "chardev-braille"
 108 DECLARE_INSTANCE_CHECKER(BaumChardev, BAUM_CHARDEV,
 109                          TYPE_CHARDEV_BRAILLE)
 110
 111 /* Let's assume NABCC by default */
 112 enum way {
 113     DOTS2ASCII,
 114     ASCII2DOTS
 115 };
 116 static const uint8_t nabcc_translation[2][256] = {
 117 #ifndef BRLAPI_DOTS
 118 #define BRLAPI_DOTS(d1,d2,d3,d4,d5,d6,d7,d8) \
 119     ((d1?BRLAPI_DOT1:0)|\
 120      (d2?BRLAPI_DOT2:0)|\
 121      (d3?BRLAPI_DOT3:0)|\
 122      (d4?BRLAPI_DOT4:0)|\
 123      (d5?BRLAPI_DOT5:0)|\
 124      (d6?BRLAPI_DOT6:0)|\
 125      (d7?BRLAPI_DOT7:0)|\
 126      (d8?BRLAPI_DOT8:0))
 127 #endif
 128 #define DO(dots, ascii) \
 129     [DOTS2ASCII][dots] = ascii, \
 130     [ASCII2DOTS][ascii] = dots
 131     DO(0, ' '),
 132     DO(BRLAPI_DOTS(1, 0, 0, 0, 0, 0, 0, 0), 'a'),
 133     DO(BRLAPI_DOTS(1, 1, 0, 0, 0, 0, 0, 0), 'b'),
 134     DO(BRLAPI_DOTS(1, 0, 0, 1, 0, 0, 0, 0), 'c'),
 135     DO(BRLAPI_DOTS(1, 0, 0, 1, 1, 0, 0, 0), 'd'),
 136     DO(BRLAPI_DOTS(1, 0, 0, 0, 1, 0, 0, 0), 'e'),
 137     DO(BRLAPI_DOTS(1, 1, 0, 1, 0, 0, 0, 0), 'f'),
 138     DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 0, 0, 0), 'g'),
 139     DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 0, 0, 0), 'h'),
 140     DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 0, 0, 0), 'i'),
 141     DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 0, 0, 0), 'j'),
 142     DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 0, 0, 0), 'k'),
 143     DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 0, 0, 0), 'l'),
 144     DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 0, 0, 0), 'm'),
 145     DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 0, 0, 0), 'n'),
 146     DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 0, 0, 0), 'o'),
 147     DO(BRLAPI_DOTS(1, 1, 1, 1, 0, 0, 0, 0), 'p'),
 148     DO(BRLAPI_DOTS(1, 1, 1, 1, 1, 0, 0, 0), 'q'),
 149     DO(BRLAPI_DOTS(1, 1, 1, 0, 1, 0, 0, 0), 'r'),
 150     DO(BRLAPI_DOTS(0, 1, 1, 1, 0, 0, 0, 0), 's'),
 151     DO(BRLAPI_DOTS(0, 1, 1, 1, 1, 0, 0, 0), 't'),
 152     DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 1, 0, 0), 'u'),
 153     DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 1, 0, 0), 'v'),
 154     DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 1, 0, 0), 'w'),
 155     DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 1, 0, 0), 'x'),
 156     DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 1, 0, 0), 'y'),
 157     DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 1, 0, 0), 'z'),
 158
 159     DO(BRLAPI_DOTS(1, 0, 0, 0, 0, 0, 1, 0), 'A'),
 160     DO(BRLAPI_DOTS(1, 1, 0, 0, 0, 0, 1, 0), 'B'),
 161     DO(BRLAPI_DOTS(1, 0, 0, 1, 0, 0, 1, 0), 'C'),
 162     DO(BRLAPI_DOTS(1, 0, 0, 1, 1, 0, 1, 0), 'D'),
 163     DO(BRLAPI_DOTS(1, 0, 0, 0, 1, 0, 1, 0), 'E'),
 164     DO(BRLAPI_DOTS(1, 1, 0, 1, 0, 0, 1, 0), 'F'),
 165     DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 0, 1, 0), 'G'),
 166     DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 0, 1, 0), 'H'),
 167     DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 0, 1, 0), 'I'),
 168     DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 0, 1, 0), 'J'),
 169     DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 0, 1, 0), 'K'),
 170     DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 0, 1, 0), 'L'),
 171     DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 0, 1, 0), 'M'),
 172     DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 0, 1, 0), 'N'),
 173     DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 0, 1, 0), 'O'),
 174     DO(BRLAPI_DOTS(1, 1, 1, 1, 0, 0, 1, 0), 'P'),
 175     DO(BRLAPI_DOTS(1, 1, 1, 1, 1, 0, 1, 0), 'Q'),
 176     DO(BRLAPI_DOTS(1, 1, 1, 0, 1, 0, 1, 0), 'R'),
 177     DO(BRLAPI_DOTS(0, 1, 1, 1, 0, 0, 1, 0), 'S'),
 178     DO(BRLAPI_DOTS(0, 1, 1, 1, 1, 0, 1, 0), 'T'),
 179     DO(BRLAPI_DOTS(1, 0, 1, 0, 0, 1, 1, 0), 'U'),
 180     DO(BRLAPI_DOTS(1, 1, 1, 0, 0, 1, 1, 0), 'V'),
 181     DO(BRLAPI_DOTS(0, 1, 0, 1, 1, 1, 1, 0), 'W'),
 182     DO(BRLAPI_DOTS(1, 0, 1, 1, 0, 1, 1, 0), 'X'),
 183     DO(BRLAPI_DOTS(1, 0, 1, 1, 1, 1, 1, 0), 'Y'),
 184     DO(BRLAPI_DOTS(1, 0, 1, 0, 1, 1, 1, 0), 'Z'),
 185
 186     DO(BRLAPI_DOTS(0, 0, 1, 0, 1, 1, 0, 0), '0'),
 187     DO(BRLAPI_DOTS(0, 1, 0, 0, 0, 0, 0, 0), '1'),
 188     DO(BRLAPI_DOTS(0, 1, 1, 0, 0, 0, 0, 0), '2'),
 189     DO(BRLAPI_DOTS(0, 1, 0, 0, 1, 0, 0, 0), '3'),
 190     DO(BRLAPI_DOTS(0, 1, 0, 0, 1, 1, 0, 0), '4'),
 191     DO(BRLAPI_DOTS(0, 1, 0, 0, 0, 1, 0, 0), '5'),
 192     DO(BRLAPI_DOTS(0, 1, 1, 0, 1, 0, 0, 0), '6'),
 193     DO(BRLAPI_DOTS(0, 1, 1, 0, 1, 1, 0, 0), '7'),
 194     DO(BRLAPI_DOTS(0, 1, 1, 0, 0, 1, 0, 0), '8'),
 195     DO(BRLAPI_DOTS(0, 0, 1, 0, 1, 0, 0, 0), '9'),
 196
 197     DO(BRLAPI_DOTS(0, 0, 0, 1, 0, 1, 0, 0), '.'),
 198     DO(BRLAPI_DOTS(0, 0, 1, 1, 0, 1, 0, 0), '+'),
 199     DO(BRLAPI_DOTS(0, 0, 1, 0, 0, 1, 0, 0), '-'),
 200     DO(BRLAPI_DOTS(1, 0, 0, 0, 0, 1, 0, 0), '*'),
 201     DO(BRLAPI_DOTS(0, 0, 1, 1, 0, 0, 0, 0), '/'),
 202     DO(BRLAPI_DOTS(1, 1, 1, 0, 1, 1, 0, 0), '('),
 203     DO(BRLAPI_DOTS(0, 1, 1, 1, 1, 1, 0, 0), ')'),
 204
 205     DO(BRLAPI_DOTS(1, 1, 1, 1, 0, 1, 0, 0), '&'),
 206     DO(BRLAPI_DOTS(0, 0, 1, 1, 1, 1, 0, 0), '#'),
 207
 208     DO(BRLAPI_DOTS(0, 0, 0, 0, 0, 1, 0, 0), ','),
 209     DO(BRLAPI_DOTS(0, 0, 0, 0, 1, 1, 0, 0), ';'),
 210     DO(BRLAPI_DOTS(1, 0, 0, 0, 1, 1, 0, 0), ':'),
 211     DO(BRLAPI_DOTS(0, 1, 1, 1, 0, 1, 0, 0), '!'),
 212     DO(BRLAPI_DOTS(1, 0, 0, 1, 1, 1, 0, 0), '?'),
 213     DO(BRLAPI_DOTS(0, 0, 0, 0, 1, 0, 0, 0), '"'),
 214     DO(BRLAPI_DOTS(0, 0, 1, 0, 0, 0, 0, 0), '\''),
 215     DO(BRLAPI_DOTS(0, 0, 0, 1, 0, 0, 0, 0), '`'),
 216     DO(BRLAPI_DOTS(0, 0, 0, 1, 1, 0, 1, 0), '^'),
 217     DO(BRLAPI_DOTS(0, 0, 0, 1, 1, 0, 0, 0), '~'),
 218     DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 1, 1, 0), '['),
 219     DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 1, 1, 0), ']'),
 220     DO(BRLAPI_DOTS(0, 1, 0, 1, 0, 1, 0, 0), '{'),
 221     DO(BRLAPI_DOTS(1, 1, 0, 1, 1, 1, 0, 0), '}'),
 222     DO(BRLAPI_DOTS(1, 1, 1, 1, 1, 1, 0, 0), '='),
 223     DO(BRLAPI_DOTS(1, 1, 0, 0, 0, 1, 0, 0), '<'),
 224     DO(BRLAPI_DOTS(0, 0, 1, 1, 1, 0, 0, 0), '>'),
 225     DO(BRLAPI_DOTS(1, 1, 0, 1, 0, 1, 0, 0), '$'),
 226     DO(BRLAPI_DOTS(1, 0, 0, 1, 0, 1, 0, 0), '%'),
 227     DO(BRLAPI_DOTS(0, 0, 0, 1, 0, 0, 1, 0), '@'),
 228     DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 1, 0, 0), '|'),
 229     DO(BRLAPI_DOTS(1, 1, 0, 0, 1, 1, 1, 0), '\\'),
 230     DO(BRLAPI_DOTS(0, 0, 0, 1, 1, 1, 0, 0), '_'),
 231 };
 232
 233 /* The guest OS has started discussing with us, finish initializing BrlAPI */
 234 static int baum_deferred_init(BaumChardev *baum)
 235 {
 236     int tty = BRLAPI_TTY_DEFAULT;
 237     QemuConsole *con;
 238
 239     if (baum->deferred_init) {
 240         return 1;
 241     }
 242
 243     if (brlapi__getDisplaySize(baum->brlapi, &baum->x, &baum->y) == -1) {
 244         brlapi_perror("baum: brlapi__getDisplaySize");
 245         return 0;
 246     }
 247     if (baum->y > 1) {
 248         baum->y = 1;
 249     }
 250     if (baum->x > 84) {
 251         baum->x = 84;
 252     }
 253
 254     con = qemu_console_lookup_by_index(0);
 255     if (con && qemu_console_is_graphic(con)) {
 256         tty = qemu_console_get_window_id(con);
 257         if (tty == -1)
 258             tty = BRLAPI_TTY_DEFAULT;
 259     }
 260
 261     if (brlapi__enterTtyMode(baum->brlapi, tty, NULL) == -1) {
 262         brlapi_perror("baum: brlapi__enterTtyMode");
 263         return 0;
 264     }
 265     baum->deferred_init = 1;
 266     return 1;
 267 }
 268
 269 /* The serial port can receive more of our data */
 270 static void baum_chr_accept_input(struct Chardev *chr)
 271 {
 272     BaumChardev *baum = BAUM_CHARDEV(chr);
 273     int room, first;
 274
 275     if (!baum->out_buf_used)
 276         return;
 277     room = qemu_chr_be_can_write(chr);
 278     if (!room)
 279         return;
 280     if (room > baum->out_buf_used)
 281         room = baum->out_buf_used;
 282
 283     first = BUF_SIZE - baum->out_buf_ptr;
 284     if (room > first) {
 285         qemu_chr_be_write(chr, baum->out_buf + baum->out_buf_ptr, first);
 286         baum->out_buf_ptr = 0;
 287         baum->out_buf_used -= first;
 288         room -= first;
 289     }
 290     qemu_chr_be_write(chr, baum->out_buf + baum->out_buf_ptr, room);
 291     baum->out_buf_ptr += room;
 292     baum->out_buf_used -= room;
 293 }
 294
 295 /* We want to send a packet */
 296 static void baum_write_packet(BaumChardev *baum, const uint8_t *buf, int len)
 297 {
 298     Chardev *chr = CHARDEV(baum);
 299     uint8_t io_buf[1 + 2 * len], *cur = io_buf;
 300     int room;
 301     *cur++ = ESC;
 302     while (len--)
 303         if ((*cur++ = *buf++) == ESC)
 304             *cur++ = ESC;
 305     room = qemu_chr_be_can_write(chr);
 306     len = cur - io_buf;
 307     if (len <= room) {
 308         /* Fits */
 309         qemu_chr_be_write(chr, io_buf, len);
 310     } else {
 311         int first;
 312         uint8_t out;
 313         /* Can't fit all, send what can be, and store the rest. */
 314         qemu_chr_be_write(chr, io_buf, room);
 315         len -= room;
 316         cur = io_buf + room;
 317         if (len > BUF_SIZE - baum->out_buf_used) {
 318             /* Can't even store it, drop the previous data... */
 319             assert(len <= BUF_SIZE);
 320             baum->out_buf_used = 0;
 321             baum->out_buf_ptr = 0;
 322         }
 323         out = baum->out_buf_ptr;
 324         baum->out_buf_used += len;
 325         first = BUF_SIZE - baum->out_buf_ptr;
 326         if (len > first) {
 327             memcpy(baum->out_buf + out, cur, first);
 328             out = 0;
 329             len -= first;
 330             cur += first;
 331         }
 332         memcpy(baum->out_buf + out, cur, len);
 333     }
 334 }
 335
 336 /* Called when the other end seems to have a wrong idea of our display size */
 337 static void baum_cellCount_timer_cb(void *opaque)
 338 {
 339     BaumChardev *baum = BAUM_CHARDEV(opaque);
 340     uint8_t cell_count[] = { BAUM_RSP_CellCount, baum->x * baum->y };
 341     DPRINTF("Timeout waiting for DisplayData, sending cell count\n");
 342     baum_write_packet(baum, cell_count, sizeof(cell_count));
 343 }
 344
 345 /* Try to interpret a whole incoming packet */
 346 static int baum_eat_packet(BaumChardev *baum, const uint8_t *buf, int len)
 347 {
 348     const uint8_t *cur = buf;
 349     uint8_t req = 0;
 350
 351     if (!len--)
 352         return 0;
 353     if (*cur++ != ESC) {
 354         while (*cur != ESC) {
 355             if (!len--)
 356                 return 0;
 357             cur++;
 358         }
 359         DPRINTF("Dropped %td bytes!\n", cur - buf);
 360     }
 361
 362 #define EAT(c) do {\
 363     if (!len--) \
 364         return 0; \
 365     if ((c = *cur++) == ESC) { \
 366         if (!len--) \
 367             return 0; \
 368         if (*cur++ != ESC) { \
 369             DPRINTF("Broken packet %#2x, tossing\n", req); \
 370             if (timer_pending(baum->cellCount_timer)) {    \
 371                 timer_del(baum->cellCount_timer);     \
 372                 baum_cellCount_timer_cb(baum);             \
 373             } \
 374             return (cur - 2 - buf); \
 375         } \
 376     } \
 377 } while (0)
 378
 379     EAT(req);
 380     switch (req) {
 381     case BAUM_REQ_DisplayData:
 382     {
 383         uint8_t cells[baum->x * baum->y], c;
 384         uint8_t text[baum->x * baum->y];
 385         uint8_t zero[baum->x * baum->y];
 386         int cursor = BRLAPI_CURSOR_OFF;
 387         int i;
 388
 389         /* Allow 100ms to complete the DisplayData packet */
 390         timer_mod(baum->cellCount_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
 391                        NANOSECONDS_PER_SECOND / 10);
 392         for (i = 0; i < baum->x * baum->y ; i++) {
 393             EAT(c);
 394             cells[i] = c;
 395             if ((c & (BRLAPI_DOT7|BRLAPI_DOT8))
 396                     == (BRLAPI_DOT7|BRLAPI_DOT8)) {
 397                 cursor = i + 1;
 398                 c &= ~(BRLAPI_DOT7|BRLAPI_DOT8);
 399             }
 400             c = nabcc_translation[DOTS2ASCII][c];
 401             if (!c) {
 402                 c = '?';
 403             }
 404             text[i] = c;
 405         }
 406         timer_del(baum->cellCount_timer);
 407
 408         memset(zero, 0, sizeof(zero));
 409
 410         brlapi_writeArguments_t wa = {
 411             .displayNumber = BRLAPI_DISPLAY_DEFAULT,
 412             .regionBegin = 1,
 413             .regionSize = baum->x * baum->y,
 414             .text = (char *)text,
 415             .textSize = baum->x * baum->y,
 416             .andMask = zero,
 417             .orMask = cells,
 418             .cursor = cursor,
 419             .charset = (char *)"ISO-8859-1",
 420         };
 421
 422         if (brlapi__write(baum->brlapi, &wa) == -1)
 423             brlapi_perror("baum brlapi_write");
 424         break;
 425     }
 426     case BAUM_REQ_SetMode:
 427     {
 428         uint8_t mode, setting;
 429         DPRINTF("SetMode\n");
 430         EAT(mode);
 431         EAT(setting);
 432         /* ignore */
 433         break;
 434     }
 435     case BAUM_REQ_SetProtocol:
 436     {
 437         uint8_t protocol;
 438         DPRINTF("SetProtocol\n");
 439         EAT(protocol);
 440         /* ignore */
 441         break;
 442     }
 443     case BAUM_REQ_GetDeviceIdentity:
 444     {
 445         uint8_t identity[17] = { BAUM_RSP_DeviceIdentity,
 446             'B','a','u','m',' ','V','a','r','i','o' };
 447         DPRINTF("GetDeviceIdentity\n");
 448         identity[11] = '0' + baum->x / 10;
 449         identity[12] = '0' + baum->x % 10;
 450         baum_write_packet(baum, identity, sizeof(identity));
 451         break;
 452     }
 453     case BAUM_REQ_GetVersionNumber:
 454     {
 455         uint8_t version[] = { BAUM_RSP_VersionNumber, 1 }; /* ? */
 456         DPRINTF("GetVersionNumber\n");
 457         baum_write_packet(baum, version, sizeof(version));
 458         break;
 459     }
 460     case BAUM_REQ_GetSerialNumber:
 461     {
 462         uint8_t serial[] = { BAUM_RSP_SerialNumber,
 463             '0','0','0','0','0','0','0','0' };
 464         DPRINTF("GetSerialNumber\n");
 465         baum_write_packet(baum, serial, sizeof(serial));
 466         break;
 467     }
 468     case BAUM_REQ_GetKeys:
 469     {
 470         DPRINTF("Get%0#2x\n", req);
 471         /* ignore */
 472         break;
 473     }
 474     default:
 475         DPRINTF("unrecognized request %0#2x\n", req);
 476         do
 477             if (!len--)
 478                 return 0;
 479         while (*cur++ != ESC);
 480         cur--;
 481         break;
 482     }
 483     return cur - buf;
 484 }
 485
 486 /* The other end is writing some data.  Store it and try to interpret */
 487 static int baum_chr_write(Chardev *chr, const uint8_t *buf, int len)
 488 {
 489     BaumChardev *baum = BAUM_CHARDEV(chr);
 490     int tocopy, cur, eaten, orig_len = len;
 491
 492     if (!len)
 493         return 0;
 494     if (!baum->brlapi)
 495         return len;
 496     if (!baum_deferred_init(baum))
 497         return len;
 498
 499     while (len) {
 500         /* Complete our buffer as much as possible */
 501         tocopy = len;
 502         if (tocopy > BUF_SIZE - baum->in_buf_used)
 503             tocopy = BUF_SIZE - baum->in_buf_used;
 504
 505         memcpy(baum->in_buf + baum->in_buf_used, buf, tocopy);
 506         baum->in_buf_used += tocopy;
 507         buf += tocopy;
 508         len -= tocopy;
 509
 510         /* Interpret it as much as possible */
 511         cur = 0;
 512         while (cur < baum->in_buf_used &&
 513                 (eaten = baum_eat_packet(baum, baum->in_buf + cur, baum->in_buf_used - cur)))
 514             cur += eaten;
 515
 516         /* Shift the remainder */
 517         if (cur) {
 518             memmove(baum->in_buf, baum->in_buf + cur, baum->in_buf_used - cur);
 519             baum->in_buf_used -= cur;
 520         }
 521
 522         /* And continue if any data left */
 523     }
 524     return orig_len;
 525 }
 526
 527 /* Send the key code to the other end */
 528 static void baum_send_key(BaumChardev *baum, uint8_t type, uint8_t value)
 529 {
 530     uint8_t packet[] = { type, value };
 531     DPRINTF("writing key %x %x\n", type, value);
 532     baum_write_packet(baum, packet, sizeof(packet));
 533 }
 534
 535 static void baum_send_key2(BaumChardev *baum, uint8_t type, uint8_t value,
 536                            uint8_t value2)
 537 {
 538     uint8_t packet[] = { type, value, value2 };
 539     DPRINTF("writing key %x %x\n", type, value);
 540     baum_write_packet(baum, packet, sizeof(packet));
 541 }
 542
 543 /* We got some data on the BrlAPI socket */
 544 static void baum_chr_read(void *opaque)
 545 {
 546     BaumChardev *baum = BAUM_CHARDEV(opaque);
 547     brlapi_keyCode_t code;
 548     int ret;
 549     if (!baum->brlapi)
 550         return;
 551     if (!baum_deferred_init(baum))
 552         return;
 553     while ((ret = brlapi__readKey(baum->brlapi, 0, &code)) == 1) {
 554         DPRINTF("got key %"BRLAPI_PRIxKEYCODE"\n", code);
 555         /* Emulate */
 556         switch (code & BRLAPI_KEY_TYPE_MASK) {
 557         case BRLAPI_KEY_TYPE_CMD:
 558             switch (code & BRLAPI_KEY_CMD_BLK_MASK) {
 559             case BRLAPI_KEY_CMD_ROUTE:
 560                 baum_send_key(baum, BAUM_RSP_RoutingKey, (code & BRLAPI_KEY_CMD_ARG_MASK)+1);
 561                 baum_send_key(baum, BAUM_RSP_RoutingKey, 0);
 562                 break;
 563             case 0:
 564                 switch (code & BRLAPI_KEY_CMD_ARG_MASK) {
 565                 case BRLAPI_KEY_CMD_FWINLT:
 566                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2);
 567                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 568                     break;
 569                 case BRLAPI_KEY_CMD_FWINRT:
 570                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR2);
 571                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 572                     break;
 573                 case BRLAPI_KEY_CMD_LNUP:
 574                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR1);
 575                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 576                     break;
 577                 case BRLAPI_KEY_CMD_LNDN:
 578                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR3);
 579                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 580                     break;
 581                 case BRLAPI_KEY_CMD_TOP:
 582                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL1|BAUM_TR1);
 583                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 584                     break;
 585                 case BRLAPI_KEY_CMD_BOT:
 586                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL3|BAUM_TR3);
 587                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 588                     break;
 589                 case BRLAPI_KEY_CMD_TOP_LEFT:
 590                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR1);
 591                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 592                     break;
 593                 case BRLAPI_KEY_CMD_BOT_LEFT:
 594                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR3);
 595                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 596                     break;
 597                 case BRLAPI_KEY_CMD_HOME:
 598                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR1|BAUM_TR3);
 599                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 600                     break;
 601                 case BRLAPI_KEY_CMD_PREFMENU:
 602                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL1|BAUM_TL3|BAUM_TR1);
 603                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 604                     break;
 605                 }
 606             }
 607             break;
 608         case BRLAPI_KEY_TYPE_SYM:
 609             {
 610                 brlapi_keyCode_t keysym = code & BRLAPI_KEY_CODE_MASK;
 611                 if (keysym < 0x100) {
 612                     uint8_t dots = nabcc_translation[ASCII2DOTS][keysym];
 613                     if (dots) {
 614                         baum_send_key2(baum, BAUM_RSP_EntryKeys, 0, dots);
 615                         baum_send_key2(baum, BAUM_RSP_EntryKeys, 0, 0);
 616                     }
 617                 }
 618                 break;
 619             }
 620         }
 621     }
 622     if (ret == -1 && (brlapi_errno != BRLAPI_ERROR_LIBCERR || errno != EINTR)) {
 623         brlapi_perror("baum: brlapi_readKey");
 624         brlapi__closeConnection(baum->brlapi);
 625         g_free(baum->brlapi);
 626         baum->brlapi = NULL;
 627     }
 628 }
 629
 630 static void char_braille_finalize(Object *obj)
 631 {
 632     BaumChardev *baum = BAUM_CHARDEV(obj);
 633
 634     timer_free(baum->cellCount_timer);
 635     if (baum->brlapi) {
 636         brlapi__closeConnection(baum->brlapi);
 637         g_free(baum->brlapi);
 638     }
 639 }
 640
 641 static void baum_chr_open(Chardev *chr,
 642                           ChardevBackend *backend,
 643                           bool *be_opened,
 644                           Error **errp)
 645 {
 646     BaumChardev *baum = BAUM_CHARDEV(chr);
 647     brlapi_handle_t *handle;
 648
 649     handle = g_malloc0(brlapi_getHandleSize());
 650     baum->brlapi = handle;
 651
 652     baum->brlapi_fd = brlapi__openConnection(handle, NULL, NULL);
 653     if (baum->brlapi_fd == -1) {
 654         error_setg(errp, "brlapi__openConnection: %s",
 655                    brlapi_strerror(brlapi_error_location()));
 656         g_free(handle);
 657         baum->brlapi = NULL;
 658         return;
 659     }
 660     baum->deferred_init = 0;
 661
 662     baum->cellCount_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, baum_cellCount_timer_cb, baum);
 663
 664     qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
 665 }
 666
 667 static void char_braille_class_init(ObjectClass *oc, void *data)
 668 {
 669     ChardevClass *cc = CHARDEV_CLASS(oc);
 670
 671     cc->open = baum_chr_open;
 672     cc->chr_write = baum_chr_write;
 673     cc->chr_accept_input = baum_chr_accept_input;
 674 }
 675
 676 static const TypeInfo char_braille_type_info = {
 677     .name = TYPE_CHARDEV_BRAILLE,
 678     .parent = TYPE_CHARDEV,
 679     .instance_size = sizeof(BaumChardev),
 680     .instance_finalize = char_braille_finalize,
 681     .class_init = char_braille_class_init,
 682 };
 683
 684 static void register_types(void)
 685 {
 686     type_register_static(&char_braille_type_info);
 687 }
 688
 689 type_init(register_types);