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