hw/tsc2005.c

   1 /*
   2  * TI TSC2005 emulator.
   3  *
   4  * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 or
  10  * (at your option) version 3 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "hw.h"
  23 #include "qemu-timer.h"
  24 #include "console.h"
  25 #include "devices.h"
  26
  27 #define TSC_CUT_RESOLUTION(value, p)    ((value) >> (16 - (p ? 12 : 10)))
  28
  29 typedef struct {
  30     qemu_irq pint;      /* Combination of the nPENIRQ and DAV signals */
  31     QEMUTimer *timer;
  32     uint16_t model;
  33
  34     int x, y;
  35     int pressure;
  36
  37     int state, reg, irq, command;
  38     uint16_t data, dav;
  39
  40     int busy;
  41     int enabled;
  42     int host_mode;
  43     int function;
  44     int nextfunction;
  45     int precision;
  46     int nextprecision;
  47     int filter;
  48     int pin_func;
  49     int timing[2];
  50     int noise;
  51     int reset;
  52     int pdst;
  53     int pnd0;
  54     uint16_t temp_thr[2];
  55     uint16_t aux_thr[2];
  56
  57     int tr[8];
  58 } TSC2005State;
  59
  60 enum {
  61     TSC_MODE_XYZ_SCAN   = 0x0,
  62     TSC_MODE_XY_SCAN,
  63     TSC_MODE_X,
  64     TSC_MODE_Y,
  65     TSC_MODE_Z,
  66     TSC_MODE_AUX,
  67     TSC_MODE_TEMP1,
  68     TSC_MODE_TEMP2,
  69     TSC_MODE_AUX_SCAN,
  70     TSC_MODE_X_TEST,
  71     TSC_MODE_Y_TEST,
  72     TSC_MODE_TS_TEST,
  73     TSC_MODE_RESERVED,
  74     TSC_MODE_XX_DRV,
  75     TSC_MODE_YY_DRV,
  76     TSC_MODE_YX_DRV,
  77 };
  78
  79 static const uint16_t mode_regs[16] = {
  80     0xf000,     /* X, Y, Z scan */
  81     0xc000,     /* X, Y scan */
  82     0x8000,     /* X */
  83     0x4000,     /* Y */
  84     0x3000,     /* Z */
  85     0x0800,     /* AUX */
  86     0x0400,     /* TEMP1 */
  87     0x0200,     /* TEMP2 */
  88     0x0800,     /* AUX scan */
  89     0x0040,     /* X test */
  90     0x0020,     /* Y test */
  91     0x0080,     /* Short-circuit test */
  92     0x0000,     /* Reserved */
  93     0x0000,     /* X+, X- drivers */
  94     0x0000,     /* Y+, Y- drivers */
  95     0x0000,     /* Y+, X- drivers */
  96 };
  97
  98 #define X_TRANSFORM(s)                  \
  99     ((s->y * s->tr[0] - s->x * s->tr[1]) / s->tr[2] + s->tr[3])
 100 #define Y_TRANSFORM(s)                  \
 101     ((s->y * s->tr[4] - s->x * s->tr[5]) / s->tr[6] + s->tr[7])
 102 #define Z1_TRANSFORM(s)                 \
 103     ((400 - ((s)->x >> 7) + ((s)->pressure << 10)) << 4)
 104 #define Z2_TRANSFORM(s)                 \
 105     ((4000 + ((s)->y >> 7) - ((s)->pressure << 10)) << 4)
 106
 107 #define AUX_VAL                         (700 << 4)      /* +/- 3 at 12-bit */
 108 #define TEMP1_VAL                       (1264 << 4)     /* +/- 5 at 12-bit */
 109 #define TEMP2_VAL                       (1531 << 4)     /* +/- 5 at 12-bit */
 110
 111 static uint16_t tsc2005_read(TSC2005State *s, int reg)
 112 {
 113     uint16_t ret;
 114
 115     switch (reg) {
 116     case 0x0:   /* X */
 117         s->dav &= ~mode_regs[TSC_MODE_X];
 118         return TSC_CUT_RESOLUTION(X_TRANSFORM(s), s->precision) +
 119                 (s->noise & 3);
 120     case 0x1:   /* Y */
 121         s->dav &= ~mode_regs[TSC_MODE_Y];
 122         s->noise ++;
 123         return TSC_CUT_RESOLUTION(Y_TRANSFORM(s), s->precision) ^
 124                 (s->noise & 3);
 125     case 0x2:   /* Z1 */
 126         s->dav &= 0xdfff;
 127         return TSC_CUT_RESOLUTION(Z1_TRANSFORM(s), s->precision) -
 128                 (s->noise & 3);
 129     case 0x3:   /* Z2 */
 130         s->dav &= 0xefff;
 131         return TSC_CUT_RESOLUTION(Z2_TRANSFORM(s), s->precision) |
 132                 (s->noise & 3);
 133
 134     case 0x4:   /* AUX */
 135         s->dav &= ~mode_regs[TSC_MODE_AUX];
 136         return TSC_CUT_RESOLUTION(AUX_VAL, s->precision);
 137
 138     case 0x5:   /* TEMP1 */
 139         s->dav &= ~mode_regs[TSC_MODE_TEMP1];
 140         return TSC_CUT_RESOLUTION(TEMP1_VAL, s->precision) -
 141                 (s->noise & 5);
 142     case 0x6:   /* TEMP2 */
 143         s->dav &= 0xdfff;
 144         s->dav &= ~mode_regs[TSC_MODE_TEMP2];
 145         return TSC_CUT_RESOLUTION(TEMP2_VAL, s->precision) ^
 146                 (s->noise & 3);
 147
 148     case 0x7:   /* Status */
 149         ret = s->dav | (s->reset << 7) | (s->pdst << 2) | 0x0;
 150         s->dav &= ~(mode_regs[TSC_MODE_X_TEST] | mode_regs[TSC_MODE_Y_TEST] |
 151                         mode_regs[TSC_MODE_TS_TEST]);
 152         s->reset = 1;
 153         return ret;
 154
 155     case 0x8:   /* AUX high treshold */
 156         return s->aux_thr[1];
 157     case 0x9:   /* AUX low treshold */
 158         return s->aux_thr[0];
 159
 160     case 0xa:   /* TEMP high treshold */
 161         return s->temp_thr[1];
 162     case 0xb:   /* TEMP low treshold */
 163         return s->temp_thr[0];
 164
 165     case 0xc:   /* CFR0 */
 166         return (s->pressure << 15) | ((!s->busy) << 14) |
 167                 (s->nextprecision << 13) | s->timing[0];
 168     case 0xd:   /* CFR1 */
 169         return s->timing[1];
 170     case 0xe:   /* CFR2 */
 171         return (s->pin_func << 14) | s->filter;
 172
 173     case 0xf:   /* Function select status */
 174         return s->function >= 0 ? 1 << s->function : 0;
 175     }
 176
 177     /* Never gets here */
 178     return 0xffff;
 179 }
 180
 181 static void tsc2005_write(TSC2005State *s, int reg, uint16_t data)
 182 {
 183     switch (reg) {
 184     case 0x8:   /* AUX high treshold */
 185         s->aux_thr[1] = data;
 186         break;
 187     case 0x9:   /* AUX low treshold */
 188         s->aux_thr[0] = data;
 189         break;
 190
 191     case 0xa:   /* TEMP high treshold */
 192         s->temp_thr[1] = data;
 193         break;
 194     case 0xb:   /* TEMP low treshold */
 195         s->temp_thr[0] = data;
 196         break;
 197
 198     case 0xc:   /* CFR0 */
 199         s->host_mode = data >> 15;
 200         if (s->enabled != !(data & 0x4000)) {
 201             s->enabled = !(data & 0x4000);
 202             fprintf(stderr, "%s: touchscreen sense %sabled\n",
 203                             __FUNCTION__, s->enabled ? "en" : "dis");
 204             if (s->busy && !s->enabled)
 205                 qemu_del_timer(s->timer);
 206             s->busy &= s->enabled;
 207         }
 208         s->nextprecision = (data >> 13) & 1;
 209         s->timing[0] = data & 0x1fff;
 210         if ((s->timing[0] >> 11) == 3)
 211             fprintf(stderr, "%s: illegal conversion clock setting\n",
 212                             __FUNCTION__);
 213         break;
 214     case 0xd:   /* CFR1 */
 215         s->timing[1] = data & 0xf07;
 216         break;
 217     case 0xe:   /* CFR2 */
 218         s->pin_func = (data >> 14) & 3;
 219         s->filter = data & 0x3fff;
 220         break;
 221
 222     default:
 223         fprintf(stderr, "%s: write into read-only register %x\n",
 224                         __FUNCTION__, reg);
 225     }
 226 }
 227
 228 /* This handles most of the chip's logic.  */
 229 static void tsc2005_pin_update(TSC2005State *s)
 230 {
 231     int64_t expires;
 232     int pin_state;
 233
 234     switch (s->pin_func) {
 235     case 0:
 236         pin_state = !s->pressure && !!s->dav;
 237         break;
 238     case 1:
 239     case 3:
 240     default:
 241         pin_state = !s->dav;
 242         break;
 243     case 2:
 244         pin_state = !s->pressure;
 245     }
 246
 247     if (pin_state != s->irq) {
 248         s->irq = pin_state;
 249         qemu_set_irq(s->pint, s->irq);
 250     }
 251
 252     switch (s->nextfunction) {
 253     case TSC_MODE_XYZ_SCAN:
 254     case TSC_MODE_XY_SCAN:
 255         if (!s->host_mode && s->dav)
 256             s->enabled = 0;
 257         if (!s->pressure)
 258             return;
 259         /* Fall through */
 260     case TSC_MODE_AUX_SCAN:
 261         break;
 262
 263     case TSC_MODE_X:
 264     case TSC_MODE_Y:
 265     case TSC_MODE_Z:
 266         if (!s->pressure)
 267             return;
 268         /* Fall through */
 269     case TSC_MODE_AUX:
 270     case TSC_MODE_TEMP1:
 271     case TSC_MODE_TEMP2:
 272     case TSC_MODE_X_TEST:
 273     case TSC_MODE_Y_TEST:
 274     case TSC_MODE_TS_TEST:
 275         if (s->dav)
 276             s->enabled = 0;
 277         break;
 278
 279     case TSC_MODE_RESERVED:
 280     case TSC_MODE_XX_DRV:
 281     case TSC_MODE_YY_DRV:
 282     case TSC_MODE_YX_DRV:
 283     default:
 284         return;
 285     }
 286
 287     if (!s->enabled || s->busy)
 288         return;
 289
 290     s->busy = 1;
 291     s->precision = s->nextprecision;
 292     s->function = s->nextfunction;
 293     s->pdst = !s->pnd0; /* Synchronised on internal clock */
 294     expires = qemu_get_clock(vm_clock) + (ticks_per_sec >> 7);
 295     qemu_mod_timer(s->timer, expires);
 296 }
 297
 298 static void tsc2005_reset(TSC2005State *s)
 299 {
 300     s->state = 0;
 301     s->pin_func = 0;
 302     s->enabled = 0;
 303     s->busy = 0;
 304     s->nextprecision = 0;
 305     s->nextfunction = 0;
 306     s->timing[0] = 0;
 307     s->timing[1] = 0;
 308     s->irq = 0;
 309     s->dav = 0;
 310     s->reset = 0;
 311     s->pdst = 1;
 312     s->pnd0 = 0;
 313     s->function = -1;
 314     s->temp_thr[0] = 0x000;
 315     s->temp_thr[1] = 0xfff;
 316     s->aux_thr[0] = 0x000;
 317     s->aux_thr[1] = 0xfff;
 318
 319     tsc2005_pin_update(s);
 320 }
 321
 322 static uint8_t tsc2005_txrx_word(void *opaque, uint8_t value)
 323 {
 324     TSC2005State *s = opaque;
 325     uint32_t ret = 0;
 326
 327     switch (s->state ++) {
 328     case 0:
 329         if (value & 0x80) {
 330             /* Command */
 331             if (value & (1 << 1))
 332                 tsc2005_reset(s);
 333             else {
 334                 s->nextfunction = (value >> 3) & 0xf;
 335                 s->nextprecision = (value >> 2) & 1;
 336                 if (s->enabled != !(value & 1)) {
 337                     s->enabled = !(value & 1);
 338                     fprintf(stderr, "%s: touchscreen sense %sabled\n",
 339                                     __FUNCTION__, s->enabled ? "en" : "dis");
 340                     if (s->busy && !s->enabled)
 341                         qemu_del_timer(s->timer);
 342                     s->busy &= s->enabled;
 343                 }
 344                 tsc2005_pin_update(s);
 345             }
 346
 347             s->state = 0;
 348         } else if (value) {
 349             /* Data transfer */
 350             s->reg = (value >> 3) & 0xf;
 351             s->pnd0 = (value >> 1) & 1;
 352             s->command = value & 1;
 353
 354             if (s->command) {
 355                 /* Read */
 356                 s->data = tsc2005_read(s, s->reg);
 357                 tsc2005_pin_update(s);
 358             } else
 359                 s->data = 0;
 360         } else
 361             s->state = 0;
 362         break;
 363
 364     case 1:
 365         if (s->command)
 366             ret = (s->data >> 8) & 0xff;
 367         else
 368             s->data |= value << 8;
 369         break;
 370
 371     case 2:
 372         if (s->command)
 373             ret = s->data & 0xff;
 374         else {
 375             s->data |= value;
 376             tsc2005_write(s, s->reg, s->data);
 377             tsc2005_pin_update(s);
 378         }
 379
 380         s->state = 0;
 381         break;
 382     }
 383
 384     return ret;
 385 }
 386
 387 uint32_t tsc2005_txrx(void *opaque, uint32_t value, int len)
 388 {
 389     uint32_t ret = 0;
 390
 391     len &= ~7;
 392     while (len > 0) {
 393         len -= 8;
 394         ret |= tsc2005_txrx_word(opaque, (value >> len) & 0xff) << len;
 395     }
 396
 397     return ret;
 398 }
 399
 400 static void tsc2005_timer_tick(void *opaque)
 401 {
 402     TSC2005State *s = opaque;
 403
 404     /* Timer ticked -- a set of conversions has been finished.  */
 405
 406     if (!s->busy)
 407         return;
 408
 409     s->busy = 0;
 410     s->dav |= mode_regs[s->function];
 411     s->function = -1;
 412     tsc2005_pin_update(s);
 413 }
 414
 415 static void tsc2005_touchscreen_event(void *opaque,
 416                 int x, int y, int z, int buttons_state)
 417 {
 418     TSC2005State *s = opaque;
 419     int p = s->pressure;
 420
 421     if (buttons_state) {
 422         s->x = x;
 423         s->y = y;
 424     }
 425     s->pressure = !!buttons_state;
 426
 427     /*
 428      * Note: We would get better responsiveness in the guest by
 429      * signaling TS events immediately, but for now we simulate
 430      * the first conversion delay for sake of correctness.
 431      */
 432     if (p != s->pressure)
 433         tsc2005_pin_update(s);
 434 }
 435
 436 static void tsc2005_save(QEMUFile *f, void *opaque)
 437 {
 438     TSC2005State *s = (TSC2005State *) opaque;
 439     int i;
 440
 441     qemu_put_be16(f, s->x);
 442     qemu_put_be16(f, s->y);
 443     qemu_put_byte(f, s->pressure);
 444
 445     qemu_put_byte(f, s->state);
 446     qemu_put_byte(f, s->reg);
 447     qemu_put_byte(f, s->command);
 448
 449     qemu_put_byte(f, s->irq);
 450     qemu_put_be16s(f, &s->dav);
 451     qemu_put_be16s(f, &s->data);
 452
 453     qemu_put_timer(f, s->timer);
 454     qemu_put_byte(f, s->enabled);
 455     qemu_put_byte(f, s->host_mode);
 456     qemu_put_byte(f, s->function);
 457     qemu_put_byte(f, s->nextfunction);
 458     qemu_put_byte(f, s->precision);
 459     qemu_put_byte(f, s->nextprecision);
 460     qemu_put_be16(f, s->filter);
 461     qemu_put_byte(f, s->pin_func);
 462     qemu_put_be16(f, s->timing[0]);
 463     qemu_put_be16(f, s->timing[1]);
 464     qemu_put_be16s(f, &s->temp_thr[0]);
 465     qemu_put_be16s(f, &s->temp_thr[1]);
 466     qemu_put_be16s(f, &s->aux_thr[0]);
 467     qemu_put_be16s(f, &s->aux_thr[1]);
 468     qemu_put_be32(f, s->noise);
 469     qemu_put_byte(f, s->reset);
 470     qemu_put_byte(f, s->pdst);
 471     qemu_put_byte(f, s->pnd0);
 472
 473     for (i = 0; i < 8; i ++)
 474         qemu_put_be32(f, s->tr[i]);
 475 }
 476
 477 static int tsc2005_load(QEMUFile *f, void *opaque, int version_id)
 478 {
 479     TSC2005State *s = (TSC2005State *) opaque;
 480     int i;
 481
 482     s->x = qemu_get_be16(f);
 483     s->y = qemu_get_be16(f);
 484     s->pressure = qemu_get_byte(f);
 485
 486     s->state = qemu_get_byte(f);
 487     s->reg = qemu_get_byte(f);
 488     s->command = qemu_get_byte(f);
 489
 490     s->irq = qemu_get_byte(f);
 491     qemu_get_be16s(f, &s->dav);
 492     qemu_get_be16s(f, &s->data);
 493
 494     qemu_get_timer(f, s->timer);
 495     s->enabled = qemu_get_byte(f);
 496     s->host_mode = qemu_get_byte(f);
 497     s->function = qemu_get_byte(f);
 498     s->nextfunction = qemu_get_byte(f);
 499     s->precision = qemu_get_byte(f);
 500     s->nextprecision = qemu_get_byte(f);
 501     s->filter = qemu_get_be16(f);
 502     s->pin_func = qemu_get_byte(f);
 503     s->timing[0] = qemu_get_be16(f);
 504     s->timing[1] = qemu_get_be16(f);
 505     qemu_get_be16s(f, &s->temp_thr[0]);
 506     qemu_get_be16s(f, &s->temp_thr[1]);
 507     qemu_get_be16s(f, &s->aux_thr[0]);
 508     qemu_get_be16s(f, &s->aux_thr[1]);
 509     s->noise = qemu_get_be32(f);
 510     s->reset = qemu_get_byte(f);
 511     s->pdst = qemu_get_byte(f);
 512     s->pnd0 = qemu_get_byte(f);
 513
 514     for (i = 0; i < 8; i ++)
 515         s->tr[i] = qemu_get_be32(f);
 516
 517     s->busy = qemu_timer_pending(s->timer);
 518     tsc2005_pin_update(s);
 519
 520     return 0;
 521 }
 522
 523 void *tsc2005_init(qemu_irq pintdav)
 524 {
 525     TSC2005State *s;
 526
 527     s = (TSC2005State *)
 528             qemu_mallocz(sizeof(TSC2005State));
 529     s->x = 400;
 530     s->y = 240;
 531     s->pressure = 0;
 532     s->precision = s->nextprecision = 0;
 533     s->timer = qemu_new_timer(vm_clock, tsc2005_timer_tick, s);
 534     s->pint = pintdav;
 535     s->model = 0x2005;
 536
 537     s->tr[0] = 0;
 538     s->tr[1] = 1;
 539     s->tr[2] = 1;
 540     s->tr[3] = 0;
 541     s->tr[4] = 1;
 542     s->tr[5] = 0;
 543     s->tr[6] = 1;
 544     s->tr[7] = 0;
 545
 546     tsc2005_reset(s);
 547
 548     qemu_add_mouse_event_handler(tsc2005_touchscreen_event, s, 1,
 549                     "QEMU TSC2005-driven Touchscreen");
 550
 551     qemu_register_reset((void *) tsc2005_reset, s);
 552     register_savevm("tsc2005", -1, 0, tsc2005_save, tsc2005_load, s);
 553
 554     return s;
 555 }
 556
 557 /*
 558  * Use tslib generated calibration data to generate ADC input values
 559  * from the touchscreen.  Assuming 12-bit precision was used during
 560  * tslib calibration.
 561  */
 562 void tsc2005_set_transform(void *opaque, MouseTransformInfo *info)
 563 {
 564     TSC2005State *s = (TSC2005State *) opaque;
 565
 566     /* This version assumes touchscreen X & Y axis are parallel or
 567      * perpendicular to LCD's  X & Y axis in some way.  */
 568     if (abs(info->a[0]) > abs(info->a[1])) {
 569         s->tr[0] = 0;
 570         s->tr[1] = -info->a[6] * info->x;
 571         s->tr[2] = info->a[0];
 572         s->tr[3] = -info->a[2] / info->a[0];
 573         s->tr[4] = info->a[6] * info->y;
 574         s->tr[5] = 0;
 575         s->tr[6] = info->a[4];
 576         s->tr[7] = -info->a[5] / info->a[4];
 577     } else {
 578         s->tr[0] = info->a[6] * info->y;
 579         s->tr[1] = 0;
 580         s->tr[2] = info->a[1];
 581         s->tr[3] = -info->a[2] / info->a[1];
 582         s->tr[4] = 0;
 583         s->tr[5] = -info->a[6] * info->x;
 584         s->tr[6] = info->a[3];
 585         s->tr[7] = -info->a[5] / info->a[3];
 586     }
 587
 588     s->tr[0] >>= 11;
 589     s->tr[1] >>= 11;
 590     s->tr[3] <<= 4;
 591     s->tr[4] >>= 11;
 592     s->tr[5] >>= 11;
 593     s->tr[7] <<= 4;
 594 }