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 #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     if (baum->y > 1) {
 243         baum->y = 1;
 244     }
 245     if (baum->x > 84) {
 246         baum->x = 84;
 247     }
 248
 249     con = qemu_console_lookup_by_index(0);
 250     if (con && qemu_console_is_graphic(con)) {
 251         tty = qemu_console_get_window_id(con);
 252         if (tty == -1)
 253             tty = BRLAPI_TTY_DEFAULT;
 254     }
 255
 256     if (brlapi__enterTtyMode(baum->brlapi, tty, NULL) == -1) {
 257         brlapi_perror("baum: brlapi__enterTtyMode");
 258         return 0;
 259     }
 260     baum->deferred_init = 1;
 261     return 1;
 262 }
 263
 264 /* The serial port can receive more of our data */
 265 static void baum_chr_accept_input(struct Chardev *chr)
 266 {
 267     BaumChardev *baum = BAUM_CHARDEV(chr);
 268     int room, first;
 269
 270     if (!baum->out_buf_used)
 271         return;
 272     room = qemu_chr_be_can_write(chr);
 273     if (!room)
 274         return;
 275     if (room > baum->out_buf_used)
 276         room = baum->out_buf_used;
 277
 278     first = BUF_SIZE - baum->out_buf_ptr;
 279     if (room > first) {
 280         qemu_chr_be_write(chr, baum->out_buf + baum->out_buf_ptr, first);
 281         baum->out_buf_ptr = 0;
 282         baum->out_buf_used -= first;
 283         room -= first;
 284     }
 285     qemu_chr_be_write(chr, baum->out_buf + baum->out_buf_ptr, room);
 286     baum->out_buf_ptr += room;
 287     baum->out_buf_used -= room;
 288 }
 289
 290 /* We want to send a packet */
 291 static void baum_write_packet(BaumChardev *baum, const uint8_t *buf, int len)
 292 {
 293     Chardev *chr = CHARDEV(baum);
 294     uint8_t io_buf[1 + 2 * len], *cur = io_buf;
 295     int room;
 296     *cur++ = ESC;
 297     while (len--)
 298         if ((*cur++ = *buf++) == ESC)
 299             *cur++ = ESC;
 300     room = qemu_chr_be_can_write(chr);
 301     len = cur - io_buf;
 302     if (len <= room) {
 303         /* Fits */
 304         qemu_chr_be_write(chr, io_buf, len);
 305     } else {
 306         int first;
 307         uint8_t out;
 308         /* Can't fit all, send what can be, and store the rest. */
 309         qemu_chr_be_write(chr, io_buf, room);
 310         len -= room;
 311         cur = io_buf + room;
 312         if (len > BUF_SIZE - baum->out_buf_used) {
 313             /* Can't even store it, drop the previous data... */
 314             assert(len <= BUF_SIZE);
 315             baum->out_buf_used = 0;
 316             baum->out_buf_ptr = 0;
 317         }
 318         out = baum->out_buf_ptr;
 319         baum->out_buf_used += len;
 320         first = BUF_SIZE - baum->out_buf_ptr;
 321         if (len > first) {
 322             memcpy(baum->out_buf + out, cur, first);
 323             out = 0;
 324             len -= first;
 325             cur += first;
 326         }
 327         memcpy(baum->out_buf + out, cur, len);
 328     }
 329 }
 330
 331 /* Called when the other end seems to have a wrong idea of our display size */
 332 static void baum_cellCount_timer_cb(void *opaque)
 333 {
 334     BaumChardev *baum = BAUM_CHARDEV(opaque);
 335     uint8_t cell_count[] = { BAUM_RSP_CellCount, baum->x * baum->y };
 336     DPRINTF("Timeout waiting for DisplayData, sending cell count\n");
 337     baum_write_packet(baum, cell_count, sizeof(cell_count));
 338 }
 339
 340 /* Try to interpret a whole incoming packet */
 341 static int baum_eat_packet(BaumChardev *baum, const uint8_t *buf, int len)
 342 {
 343     const uint8_t *cur = buf;
 344     uint8_t req = 0;
 345
 346     if (!len--)
 347         return 0;
 348     if (*cur++ != ESC) {
 349         while (*cur != ESC) {
 350             if (!len--)
 351                 return 0;
 352             cur++;
 353         }
 354         DPRINTF("Dropped %td bytes!\n", cur - buf);
 355     }
 356
 357 #define EAT(c) do {\
 358     if (!len--) \
 359         return 0; \
 360     if ((c = *cur++) == ESC) { \
 361         if (!len--) \
 362             return 0; \
 363         if (*cur++ != ESC) { \
 364             DPRINTF("Broken packet %#2x, tossing\n", req); \
 365             if (timer_pending(baum->cellCount_timer)) {    \
 366                 timer_del(baum->cellCount_timer);     \
 367                 baum_cellCount_timer_cb(baum);             \
 368             } \
 369             return (cur - 2 - buf); \
 370         } \
 371     } \
 372 } while (0)
 373
 374     EAT(req);
 375     switch (req) {
 376     case BAUM_REQ_DisplayData:
 377     {
 378         uint8_t cells[baum->x * baum->y], c;
 379         uint8_t text[baum->x * baum->y];
 380         uint8_t zero[baum->x * baum->y];
 381         int cursor = BRLAPI_CURSOR_OFF;
 382         int i;
 383
 384         /* Allow 100ms to complete the DisplayData packet */
 385         timer_mod(baum->cellCount_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
 386                        NANOSECONDS_PER_SECOND / 10);
 387         for (i = 0; i < baum->x * baum->y ; i++) {
 388             EAT(c);
 389             cells[i] = c;
 390             if ((c & (BRLAPI_DOT7|BRLAPI_DOT8))
 391                     == (BRLAPI_DOT7|BRLAPI_DOT8)) {
 392                 cursor = i + 1;
 393                 c &= ~(BRLAPI_DOT7|BRLAPI_DOT8);
 394             }
 395             c = nabcc_translation[DOTS2ASCII][c];
 396             if (!c) {
 397                 c = '?';
 398             }
 399             text[i] = c;
 400         }
 401         timer_del(baum->cellCount_timer);
 402
 403         memset(zero, 0, sizeof(zero));
 404
 405         brlapi_writeArguments_t wa = {
 406             .displayNumber = BRLAPI_DISPLAY_DEFAULT,
 407             .regionBegin = 1,
 408             .regionSize = baum->x * baum->y,
 409             .text = (char *)text,
 410             .textSize = baum->x * baum->y,
 411             .andMask = zero,
 412             .orMask = cells,
 413             .cursor = cursor,
 414             .charset = (char *)"ISO-8859-1",
 415         };
 416
 417         if (brlapi__write(baum->brlapi, &wa) == -1)
 418             brlapi_perror("baum brlapi_write");
 419         break;
 420     }
 421     case BAUM_REQ_SetMode:
 422     {
 423         uint8_t mode, setting;
 424         DPRINTF("SetMode\n");
 425         EAT(mode);
 426         EAT(setting);
 427         /* ignore */
 428         break;
 429     }
 430     case BAUM_REQ_SetProtocol:
 431     {
 432         uint8_t protocol;
 433         DPRINTF("SetProtocol\n");
 434         EAT(protocol);
 435         /* ignore */
 436         break;
 437     }
 438     case BAUM_REQ_GetDeviceIdentity:
 439     {
 440         uint8_t identity[17] = { BAUM_RSP_DeviceIdentity,
 441             'B','a','u','m',' ','V','a','r','i','o' };
 442         DPRINTF("GetDeviceIdentity\n");
 443         identity[11] = '0' + baum->x / 10;
 444         identity[12] = '0' + baum->x % 10;
 445         baum_write_packet(baum, identity, sizeof(identity));
 446         break;
 447     }
 448     case BAUM_REQ_GetVersionNumber:
 449     {
 450         uint8_t version[] = { BAUM_RSP_VersionNumber, 1 }; /* ? */
 451         DPRINTF("GetVersionNumber\n");
 452         baum_write_packet(baum, version, sizeof(version));
 453         break;
 454     }
 455     case BAUM_REQ_GetSerialNumber:
 456     {
 457         uint8_t serial[] = { BAUM_RSP_SerialNumber,
 458             '0','0','0','0','0','0','0','0' };
 459         DPRINTF("GetSerialNumber\n");
 460         baum_write_packet(baum, serial, sizeof(serial));
 461         break;
 462     }
 463     case BAUM_REQ_GetKeys:
 464     {
 465         DPRINTF("Get%0#2x\n", req);
 466         /* ignore */
 467         break;
 468     }
 469     default:
 470         DPRINTF("unrecognized request %0#2x\n", req);
 471         do
 472             if (!len--)
 473                 return 0;
 474         while (*cur++ != ESC);
 475         cur--;
 476         break;
 477     }
 478     return cur - buf;
 479 }
 480
 481 /* The other end is writing some data.  Store it and try to interpret */
 482 static int baum_chr_write(Chardev *chr, const uint8_t *buf, int len)
 483 {
 484     BaumChardev *baum = BAUM_CHARDEV(chr);
 485     int tocopy, cur, eaten, orig_len = len;
 486
 487     if (!len)
 488         return 0;
 489     if (!baum->brlapi)
 490         return len;
 491     if (!baum_deferred_init(baum))
 492         return len;
 493
 494     while (len) {
 495         /* Complete our buffer as much as possible */
 496         tocopy = len;
 497         if (tocopy > BUF_SIZE - baum->in_buf_used)
 498             tocopy = BUF_SIZE - baum->in_buf_used;
 499
 500         memcpy(baum->in_buf + baum->in_buf_used, buf, tocopy);
 501         baum->in_buf_used += tocopy;
 502         buf += tocopy;
 503         len -= tocopy;
 504
 505         /* Interpret it as much as possible */
 506         cur = 0;
 507         while (cur < baum->in_buf_used &&
 508                 (eaten = baum_eat_packet(baum, baum->in_buf + cur, baum->in_buf_used - cur)))
 509             cur += eaten;
 510
 511         /* Shift the remainder */
 512         if (cur) {
 513             memmove(baum->in_buf, baum->in_buf + cur, baum->in_buf_used - cur);
 514             baum->in_buf_used -= cur;
 515         }
 516
 517         /* And continue if any data left */
 518     }
 519     return orig_len;
 520 }
 521
 522 /* Send the key code to the other end */
 523 static void baum_send_key(BaumChardev *baum, uint8_t type, uint8_t value)
 524 {
 525     uint8_t packet[] = { type, value };
 526     DPRINTF("writing key %x %x\n", type, value);
 527     baum_write_packet(baum, packet, sizeof(packet));
 528 }
 529
 530 static void baum_send_key2(BaumChardev *baum, uint8_t type, uint8_t value,
 531                            uint8_t value2)
 532 {
 533     uint8_t packet[] = { type, value, value2 };
 534     DPRINTF("writing key %x %x\n", type, value);
 535     baum_write_packet(baum, packet, sizeof(packet));
 536 }
 537
 538 /* We got some data on the BrlAPI socket */
 539 static void baum_chr_read(void *opaque)
 540 {
 541     BaumChardev *baum = BAUM_CHARDEV(opaque);
 542     brlapi_keyCode_t code;
 543     int ret;
 544     if (!baum->brlapi)
 545         return;
 546     if (!baum_deferred_init(baum))
 547         return;
 548     while ((ret = brlapi__readKey(baum->brlapi, 0, &code)) == 1) {
 549         DPRINTF("got key %"BRLAPI_PRIxKEYCODE"\n", code);
 550         /* Emulate */
 551         switch (code & BRLAPI_KEY_TYPE_MASK) {
 552         case BRLAPI_KEY_TYPE_CMD:
 553             switch (code & BRLAPI_KEY_CMD_BLK_MASK) {
 554             case BRLAPI_KEY_CMD_ROUTE:
 555                 baum_send_key(baum, BAUM_RSP_RoutingKey, (code & BRLAPI_KEY_CMD_ARG_MASK)+1);
 556                 baum_send_key(baum, BAUM_RSP_RoutingKey, 0);
 557                 break;
 558             case 0:
 559                 switch (code & BRLAPI_KEY_CMD_ARG_MASK) {
 560                 case BRLAPI_KEY_CMD_FWINLT:
 561                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2);
 562                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 563                     break;
 564                 case BRLAPI_KEY_CMD_FWINRT:
 565                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR2);
 566                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 567                     break;
 568                 case BRLAPI_KEY_CMD_LNUP:
 569                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR1);
 570                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 571                     break;
 572                 case BRLAPI_KEY_CMD_LNDN:
 573                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TR3);
 574                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 575                     break;
 576                 case BRLAPI_KEY_CMD_TOP:
 577                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL1|BAUM_TR1);
 578                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 579                     break;
 580                 case BRLAPI_KEY_CMD_BOT:
 581                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL3|BAUM_TR3);
 582                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 583                     break;
 584                 case BRLAPI_KEY_CMD_TOP_LEFT:
 585                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR1);
 586                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 587                     break;
 588                 case BRLAPI_KEY_CMD_BOT_LEFT:
 589                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR3);
 590                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 591                     break;
 592                 case BRLAPI_KEY_CMD_HOME:
 593                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL2|BAUM_TR1|BAUM_TR3);
 594                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 595                     break;
 596                 case BRLAPI_KEY_CMD_PREFMENU:
 597                     baum_send_key(baum, BAUM_RSP_TopKeys, BAUM_TL1|BAUM_TL3|BAUM_TR1);
 598                     baum_send_key(baum, BAUM_RSP_TopKeys, 0);
 599                     break;
 600                 }
 601             }
 602             break;
 603         case BRLAPI_KEY_TYPE_SYM:
 604             {
 605                 brlapi_keyCode_t keysym = code & BRLAPI_KEY_CODE_MASK;
 606                 if (keysym < 0x100) {
 607                     uint8_t dots = nabcc_translation[ASCII2DOTS][keysym];
 608                     if (dots) {
 609                         baum_send_key2(baum, BAUM_RSP_EntryKeys, 0, dots);
 610                         baum_send_key2(baum, BAUM_RSP_EntryKeys, 0, 0);
 611                     }
 612                 }
 613                 break;
 614             }
 615         }
 616     }
 617     if (ret == -1 && (brlapi_errno != BRLAPI_ERROR_LIBCERR || errno != EINTR)) {
 618         brlapi_perror("baum: brlapi_readKey");
 619         brlapi__closeConnection(baum->brlapi);
 620         g_free(baum->brlapi);
 621         baum->brlapi = NULL;
 622     }
 623 }
 624
 625 static void char_braille_finalize(Object *obj)
 626 {
 627     BaumChardev *baum = BAUM_CHARDEV(obj);
 628
 629     timer_free(baum->cellCount_timer);
 630     if (baum->brlapi) {
 631         brlapi__closeConnection(baum->brlapi);
 632         g_free(baum->brlapi);
 633     }
 634 }
 635
 636 static void baum_chr_open(Chardev *chr,
 637                           ChardevBackend *backend,
 638                           bool *be_opened,
 639                           Error **errp)
 640 {
 641     BaumChardev *baum = BAUM_CHARDEV(chr);
 642     brlapi_handle_t *handle;
 643
 644     handle = g_malloc0(brlapi_getHandleSize());
 645     baum->brlapi = handle;
 646
 647     baum->brlapi_fd = brlapi__openConnection(handle, NULL, NULL);
 648     if (baum->brlapi_fd == -1) {
 649         error_setg(errp, "brlapi__openConnection: %s",
 650                    brlapi_strerror(brlapi_error_location()));
 651         g_free(handle);
 652         baum->brlapi = NULL;
 653         return;
 654     }
 655     baum->deferred_init = 0;
 656
 657     baum->cellCount_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, baum_cellCount_timer_cb, baum);
 658
 659     qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
 660 }
 661
 662 static void char_braille_class_init(ObjectClass *oc, void *data)
 663 {
 664     ChardevClass *cc = CHARDEV_CLASS(oc);
 665
 666     cc->open = baum_chr_open;
 667     cc->chr_write = baum_chr_write;
 668     cc->chr_accept_input = baum_chr_accept_input;
 669 }
 670
 671 static const TypeInfo char_braille_type_info = {
 672     .name = TYPE_CHARDEV_BRAILLE,
 673     .parent = TYPE_CHARDEV,
 674     .instance_size = sizeof(BaumChardev),
 675     .instance_finalize = char_braille_finalize,
 676     .class_init = char_braille_class_init,
 677 };
 678
 679 static void register_types(void)
 680 {
 681     type_register_static(&char_braille_type_info);
 682 }
 683
 684 type_init(register_types);