chardev/baum.c

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