drivers/media/video/pvrusb2/pvrusb2-ctrl.c

   1 /*
   2  *
   3  *  $Id$
   4  *
   5  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "pvrusb2-ctrl.h"
  23 #include "pvrusb2-hdw-internal.h"
  24 #include <linux/errno.h>
  25 #include <linux/string.h>
  26 #include <linux/mutex.h>
  27
  28
  29 static int pvr2_ctrl_range_check(struct pvr2_ctrl *cptr,int val)
  30 {
  31         if (cptr->info->check_value) {
  32                 if (!cptr->info->check_value(cptr,val)) return -ERANGE;
  33         } else {
  34                 int lim;
  35                 lim = cptr->info->def.type_int.min_value;
  36                 if (cptr->info->get_min_value) {
  37                         cptr->info->get_min_value(cptr,&lim);
  38                 }
  39                 if (val < lim) return -ERANGE;
  40                 lim = cptr->info->def.type_int.max_value;
  41                 if (cptr->info->get_max_value) {
  42                         cptr->info->get_max_value(cptr,&lim);
  43                 }
  44                 if (val > lim) return -ERANGE;
  45         }
  46         return 0;
  47 }
  48
  49
  50 /* Set the given control. */
  51 int pvr2_ctrl_set_value(struct pvr2_ctrl *cptr,int val)
  52 {
  53         return pvr2_ctrl_set_mask_value(cptr,~0,val);
  54 }
  55
  56
  57 /* Set/clear specific bits of the given control. */
  58 int pvr2_ctrl_set_mask_value(struct pvr2_ctrl *cptr,int mask,int val)
  59 {
  60         int ret = 0;
  61         if (!cptr) return -EINVAL;
  62         LOCK_TAKE(cptr->hdw->big_lock); do {
  63                 if (cptr->info->set_value) {
  64                         if (cptr->info->type == pvr2_ctl_bitmask) {
  65                                 mask &= cptr->info->def.type_bitmask.valid_bits;
  66                         } else if (cptr->info->type == pvr2_ctl_int) {
  67                                 ret = pvr2_ctrl_range_check(cptr,val);
  68                                 if (ret < 0) break;
  69                         } else if (cptr->info->type == pvr2_ctl_enum) {
  70                                 if (val >= cptr->info->def.type_enum.count) {
  71                                         break;
  72                                 }
  73                         } else if (cptr->info->type != pvr2_ctl_bool) {
  74                                 break;
  75                         }
  76                         ret = cptr->info->set_value(cptr,mask,val);
  77                 } else {
  78                         ret = -EPERM;
  79                 }
  80         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
  81         return ret;
  82 }
  83
  84
  85 /* Get the current value of the given control. */
  86 int pvr2_ctrl_get_value(struct pvr2_ctrl *cptr,int *valptr)
  87 {
  88         int ret = 0;
  89         if (!cptr) return -EINVAL;
  90         LOCK_TAKE(cptr->hdw->big_lock); do {
  91                 ret = cptr->info->get_value(cptr,valptr);
  92         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
  93         return ret;
  94 }
  95
  96
  97 /* Retrieve control's type */
  98 enum pvr2_ctl_type pvr2_ctrl_get_type(struct pvr2_ctrl *cptr)
  99 {
 100         if (!cptr) return pvr2_ctl_int;
 101         return cptr->info->type;
 102 }
 103
 104
 105 /* Retrieve control's maximum value (int type) */
 106 int pvr2_ctrl_get_max(struct pvr2_ctrl *cptr)
 107 {
 108         int ret = 0;
 109         if (!cptr) return 0;
 110         LOCK_TAKE(cptr->hdw->big_lock); do {
 111                 if (cptr->info->get_max_value) {
 112                         cptr->info->get_max_value(cptr,&ret);
 113                 } else if (cptr->info->type == pvr2_ctl_int) {
 114                         ret = cptr->info->def.type_int.max_value;
 115                 }
 116         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 117         return ret;
 118 }
 119
 120
 121 /* Retrieve control's minimum value (int type) */
 122 int pvr2_ctrl_get_min(struct pvr2_ctrl *cptr)
 123 {
 124         int ret = 0;
 125         if (!cptr) return 0;
 126         LOCK_TAKE(cptr->hdw->big_lock); do {
 127                 if (cptr->info->get_min_value) {
 128                         cptr->info->get_min_value(cptr,&ret);
 129                 } else if (cptr->info->type == pvr2_ctl_int) {
 130                         ret = cptr->info->def.type_int.min_value;
 131                 }
 132         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 133         return ret;
 134 }
 135
 136
 137 /* Retrieve control's default value (any type) */
 138 int pvr2_ctrl_get_def(struct pvr2_ctrl *cptr)
 139 {
 140         int ret = 0;
 141         if (!cptr) return 0;
 142         LOCK_TAKE(cptr->hdw->big_lock); do {
 143                 if (cptr->info->type == pvr2_ctl_int) {
 144                         ret = cptr->info->default_value;
 145                 }
 146         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 147         return ret;
 148 }
 149
 150
 151 /* Retrieve control's enumeration count (enum only) */
 152 int pvr2_ctrl_get_cnt(struct pvr2_ctrl *cptr)
 153 {
 154         int ret = 0;
 155         if (!cptr) return 0;
 156         LOCK_TAKE(cptr->hdw->big_lock); do {
 157                 if (cptr->info->type == pvr2_ctl_enum) {
 158                         ret = cptr->info->def.type_enum.count;
 159                 }
 160         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 161         return ret;
 162 }
 163
 164
 165 /* Retrieve control's valid mask bits (bit mask only) */
 166 int pvr2_ctrl_get_mask(struct pvr2_ctrl *cptr)
 167 {
 168         int ret = 0;
 169         if (!cptr) return 0;
 170         LOCK_TAKE(cptr->hdw->big_lock); do {
 171                 if (cptr->info->type == pvr2_ctl_bitmask) {
 172                         ret = cptr->info->def.type_bitmask.valid_bits;
 173                 }
 174         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 175         return ret;
 176 }
 177
 178
 179 /* Retrieve the control's name */
 180 const char *pvr2_ctrl_get_name(struct pvr2_ctrl *cptr)
 181 {
 182         if (!cptr) return NULL;
 183         return cptr->info->name;
 184 }
 185
 186
 187 /* Retrieve the control's desc */
 188 const char *pvr2_ctrl_get_desc(struct pvr2_ctrl *cptr)
 189 {
 190         if (!cptr) return NULL;
 191         return cptr->info->desc;
 192 }
 193
 194
 195 /* Retrieve a control enumeration or bit mask value */
 196 int pvr2_ctrl_get_valname(struct pvr2_ctrl *cptr,int val,
 197                           char *bptr,unsigned int bmax,
 198                           unsigned int *blen)
 199 {
 200         int ret = -EINVAL;
 201         if (!cptr) return 0;
 202         *blen = 0;
 203         LOCK_TAKE(cptr->hdw->big_lock); do {
 204                 if (cptr->info->type == pvr2_ctl_enum) {
 205                         const char **names;
 206                         names = cptr->info->def.type_enum.value_names;
 207                         if ((val >= 0) &&
 208                             (val < cptr->info->def.type_enum.count)) {
 209                                 if (names[val]) {
 210                                         *blen = scnprintf(
 211                                                 bptr,bmax,"%s",
 212                                                 names[val]);
 213                                 } else {
 214                                         *blen = 0;
 215                                 }
 216                                 ret = 0;
 217                         }
 218                 } else if (cptr->info->type == pvr2_ctl_bitmask) {
 219                         const char **names;
 220                         unsigned int idx;
 221                         int msk;
 222                         names = cptr->info->def.type_bitmask.bit_names;
 223                         val &= cptr->info->def.type_bitmask.valid_bits;
 224                         for (idx = 0, msk = 1; val; idx++, msk <<= 1) {
 225                                 if (val & msk) {
 226                                         *blen = scnprintf(bptr,bmax,"%s",
 227                                                           names[idx]);
 228                                         ret = 0;
 229                                         break;
 230                                 }
 231                         }
 232                 }
 233         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 234         return ret;
 235 }
 236
 237
 238 /* Return V4L ID for this control or zero if none */
 239 int pvr2_ctrl_get_v4lid(struct pvr2_ctrl *cptr)
 240 {
 241         if (!cptr) return 0;
 242         return cptr->info->v4l_id;
 243 }
 244
 245
 246 unsigned int pvr2_ctrl_get_v4lflags(struct pvr2_ctrl *cptr)
 247 {
 248         unsigned int flags = 0;
 249
 250         if (cptr->info->get_v4lflags) {
 251                 flags = cptr->info->get_v4lflags(cptr);
 252         }
 253
 254         if (cptr->info->set_value) {
 255                 flags &= ~V4L2_CTRL_FLAG_READ_ONLY;
 256         } else {
 257                 flags |= V4L2_CTRL_FLAG_READ_ONLY;
 258         }
 259
 260         return flags;
 261 }
 262
 263
 264 /* Return true if control is writable */
 265 int pvr2_ctrl_is_writable(struct pvr2_ctrl *cptr)
 266 {
 267         if (!cptr) return 0;
 268         return cptr->info->set_value != NULL;
 269 }
 270
 271
 272 /* Return true if control has custom symbolic representation */
 273 int pvr2_ctrl_has_custom_symbols(struct pvr2_ctrl *cptr)
 274 {
 275         if (!cptr) return 0;
 276         if (!cptr->info->val_to_sym) return 0;
 277         if (!cptr->info->sym_to_val) return 0;
 278         return !0;
 279 }
 280
 281
 282 /* Convert a given mask/val to a custom symbolic value */
 283 int pvr2_ctrl_custom_value_to_sym(struct pvr2_ctrl *cptr,
 284                                   int mask,int val,
 285                                   char *buf,unsigned int maxlen,
 286                                   unsigned int *len)
 287 {
 288         if (!cptr) return -EINVAL;
 289         if (!cptr->info->val_to_sym) return -EINVAL;
 290         return cptr->info->val_to_sym(cptr,mask,val,buf,maxlen,len);
 291 }
 292
 293
 294 /* Convert a symbolic value to a mask/value pair */
 295 int pvr2_ctrl_custom_sym_to_value(struct pvr2_ctrl *cptr,
 296                                   const char *buf,unsigned int len,
 297                                   int *maskptr,int *valptr)
 298 {
 299         if (!cptr) return -EINVAL;
 300         if (!cptr->info->sym_to_val) return -EINVAL;
 301         return cptr->info->sym_to_val(cptr,buf,len,maskptr,valptr);
 302 }
 303
 304
 305 static unsigned int gen_bitmask_string(int msk,int val,int msk_only,
 306                                        const char **names,
 307                                        char *ptr,unsigned int len)
 308 {
 309         unsigned int idx;
 310         long sm,um;
 311         int spcFl;
 312         unsigned int uc,cnt;
 313         const char *idStr;
 314
 315         spcFl = 0;
 316         uc = 0;
 317         um = 0;
 318         for (idx = 0, sm = 1; msk; idx++, sm <<= 1) {
 319                 if (sm & msk) {
 320                         msk &= ~sm;
 321                         idStr = names[idx];
 322                         if (idStr) {
 323                                 cnt = scnprintf(ptr,len,"%s%s%s",
 324                                                 (spcFl ? " " : ""),
 325                                                 (msk_only ? "" :
 326                                                  ((val & sm) ? "+" : "-")),
 327                                                 idStr);
 328                                 ptr += cnt; len -= cnt; uc += cnt;
 329                                 spcFl = !0;
 330                         } else {
 331                                 um |= sm;
 332                         }
 333                 }
 334         }
 335         if (um) {
 336                 if (msk_only) {
 337                         cnt = scnprintf(ptr,len,"%s0x%lx",
 338                                         (spcFl ? " " : ""),
 339                                         um);
 340                         ptr += cnt; len -= cnt; uc += cnt;
 341                         spcFl = !0;
 342                 } else if (um & val) {
 343                         cnt = scnprintf(ptr,len,"%s+0x%lx",
 344                                         (spcFl ? " " : ""),
 345                                         um & val);
 346                         ptr += cnt; len -= cnt; uc += cnt;
 347                         spcFl = !0;
 348                 } else if (um & ~val) {
 349                         cnt = scnprintf(ptr,len,"%s+0x%lx",
 350                                         (spcFl ? " " : ""),
 351                                         um & ~val);
 352                         ptr += cnt; len -= cnt; uc += cnt;
 353                         spcFl = !0;
 354                 }
 355         }
 356         return uc;
 357 }
 358
 359
 360 static const char *boolNames[] = {
 361         "false",
 362         "true",
 363         "no",
 364         "yes",
 365 };
 366
 367
 368 static int parse_token(const char *ptr,unsigned int len,
 369                        int *valptr,
 370                        const char **names,unsigned int namecnt)
 371 {
 372         char buf[33];
 373         unsigned int slen;
 374         unsigned int idx;
 375         int negfl;
 376         char *p2;
 377         *valptr = 0;
 378         if (!names) namecnt = 0;
 379         for (idx = 0; idx < namecnt; idx++) {
 380                 if (!names[idx]) continue;
 381                 slen = strlen(names[idx]);
 382                 if (slen != len) continue;
 383                 if (memcmp(names[idx],ptr,slen)) continue;
 384                 *valptr = idx;
 385                 return 0;
 386         }
 387         negfl = 0;
 388         if ((*ptr == '-') || (*ptr == '+')) {
 389                 negfl = (*ptr == '-');
 390                 ptr++; len--;
 391         }
 392         if (len >= sizeof(buf)) return -EINVAL;
 393         memcpy(buf,ptr,len);
 394         buf[len] = 0;
 395         *valptr = simple_strtol(buf,&p2,0);
 396         if (negfl) *valptr = -(*valptr);
 397         if (*p2) return -EINVAL;
 398         return 1;
 399 }
 400
 401
 402 static int parse_mtoken(const char *ptr,unsigned int len,
 403                         int *valptr,
 404                         const char **names,int valid_bits)
 405 {
 406         char buf[33];
 407         unsigned int slen;
 408         unsigned int idx;
 409         char *p2;
 410         int msk;
 411         *valptr = 0;
 412         for (idx = 0, msk = 1; valid_bits; idx++, msk <<= 1) {
 413                 if (!(msk & valid_bits)) continue;
 414                 valid_bits &= ~msk;
 415                 if (!names[idx]) continue;
 416                 slen = strlen(names[idx]);
 417                 if (slen != len) continue;
 418                 if (memcmp(names[idx],ptr,slen)) continue;
 419                 *valptr = msk;
 420                 return 0;
 421         }
 422         if (len >= sizeof(buf)) return -EINVAL;
 423         memcpy(buf,ptr,len);
 424         buf[len] = 0;
 425         *valptr = simple_strtol(buf,&p2,0);
 426         if (*p2) return -EINVAL;
 427         return 0;
 428 }
 429
 430
 431 static int parse_tlist(const char *ptr,unsigned int len,
 432                        int *maskptr,int *valptr,
 433                        const char **names,int valid_bits)
 434 {
 435         unsigned int cnt;
 436         int mask,val,kv,mode,ret;
 437         mask = 0;
 438         val = 0;
 439         ret = 0;
 440         while (len) {
 441                 cnt = 0;
 442                 while ((cnt < len) &&
 443                        ((ptr[cnt] <= 32) ||
 444                         (ptr[cnt] >= 127))) cnt++;
 445                 ptr += cnt;
 446                 len -= cnt;
 447                 mode = 0;
 448                 if ((*ptr == '-') || (*ptr == '+')) {
 449                         mode = (*ptr == '-') ? -1 : 1;
 450                         ptr++;
 451                         len--;
 452                 }
 453                 cnt = 0;
 454                 while (cnt < len) {
 455                         if (ptr[cnt] <= 32) break;
 456                         if (ptr[cnt] >= 127) break;
 457                         cnt++;
 458                 }
 459                 if (!cnt) break;
 460                 if (parse_mtoken(ptr,cnt,&kv,names,valid_bits)) {
 461                         ret = -EINVAL;
 462                         break;
 463                 }
 464                 ptr += cnt;
 465                 len -= cnt;
 466                 switch (mode) {
 467                 case 0:
 468                         mask = valid_bits;
 469                         val |= kv;
 470                         break;
 471                 case -1:
 472                         mask |= kv;
 473                         val &= ~kv;
 474                         break;
 475                 case 1:
 476                         mask |= kv;
 477                         val |= kv;
 478                         break;
 479                 default:
 480                         break;
 481                 }
 482         }
 483         *maskptr = mask;
 484         *valptr = val;
 485         return ret;
 486 }
 487
 488
 489 /* Convert a symbolic value to a mask/value pair */
 490 int pvr2_ctrl_sym_to_value(struct pvr2_ctrl *cptr,
 491                            const char *ptr,unsigned int len,
 492                            int *maskptr,int *valptr)
 493 {
 494         int ret = -EINVAL;
 495         unsigned int cnt;
 496
 497         *maskptr = 0;
 498         *valptr = 0;
 499
 500         cnt = 0;
 501         while ((cnt < len) && ((ptr[cnt] <= 32) || (ptr[cnt] >= 127))) cnt++;
 502         len -= cnt; ptr += cnt;
 503         cnt = 0;
 504         while ((cnt < len) && ((ptr[len-(cnt+1)] <= 32) ||
 505                                (ptr[len-(cnt+1)] >= 127))) cnt++;
 506         len -= cnt;
 507
 508         if (!len) return -EINVAL;
 509
 510         LOCK_TAKE(cptr->hdw->big_lock); do {
 511                 if (cptr->info->type == pvr2_ctl_int) {
 512                         ret = parse_token(ptr,len,valptr,NULL,0);
 513                         if (ret >= 0) {
 514                                 ret = pvr2_ctrl_range_check(cptr,*valptr);
 515                         }
 516                         if (maskptr) *maskptr = ~0;
 517                 } else if (cptr->info->type == pvr2_ctl_bool) {
 518                         ret = parse_token(ptr,len,valptr,boolNames,
 519                                           ARRAY_SIZE(boolNames));
 520                         if (ret == 1) {
 521                                 *valptr = *valptr ? !0 : 0;
 522                         } else if (ret == 0) {
 523                                 *valptr = (*valptr & 1) ? !0 : 0;
 524                         }
 525                         if (maskptr) *maskptr = 1;
 526                 } else if (cptr->info->type == pvr2_ctl_enum) {
 527                         ret = parse_token(
 528                                 ptr,len,valptr,
 529                                 cptr->info->def.type_enum.value_names,
 530                                 cptr->info->def.type_enum.count);
 531                         if ((ret >= 0) &&
 532                             ((*valptr < 0) ||
 533                              (*valptr >= cptr->info->def.type_enum.count))) {
 534                                 ret = -ERANGE;
 535                         }
 536                         if (maskptr) *maskptr = ~0;
 537                 } else if (cptr->info->type == pvr2_ctl_bitmask) {
 538                         ret = parse_tlist(
 539                                 ptr,len,maskptr,valptr,
 540                                 cptr->info->def.type_bitmask.bit_names,
 541                                 cptr->info->def.type_bitmask.valid_bits);
 542                 }
 543         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 544         return ret;
 545 }
 546
 547
 548 /* Convert a given mask/val to a symbolic value */
 549 int pvr2_ctrl_value_to_sym_internal(struct pvr2_ctrl *cptr,
 550                                     int mask,int val,
 551                                     char *buf,unsigned int maxlen,
 552                                     unsigned int *len)
 553 {
 554         int ret = -EINVAL;
 555
 556         *len = 0;
 557         if (cptr->info->type == pvr2_ctl_int) {
 558                 *len = scnprintf(buf,maxlen,"%d",val);
 559                 ret = 0;
 560         } else if (cptr->info->type == pvr2_ctl_bool) {
 561                 *len = scnprintf(buf,maxlen,"%s",val ? "true" : "false");
 562                 ret = 0;
 563         } else if (cptr->info->type == pvr2_ctl_enum) {
 564                 const char **names;
 565                 names = cptr->info->def.type_enum.value_names;
 566                 if ((val >= 0) &&
 567                     (val < cptr->info->def.type_enum.count)) {
 568                         if (names[val]) {
 569                                 *len = scnprintf(
 570                                         buf,maxlen,"%s",
 571                                         names[val]);
 572                         } else {
 573                                 *len = 0;
 574                         }
 575                         ret = 0;
 576                 }
 577         } else if (cptr->info->type == pvr2_ctl_bitmask) {
 578                 *len = gen_bitmask_string(
 579                         val & mask & cptr->info->def.type_bitmask.valid_bits,
 580                         ~0,!0,
 581                         cptr->info->def.type_bitmask.bit_names,
 582                         buf,maxlen);
 583         }
 584         return ret;
 585 }
 586
 587
 588 /* Convert a given mask/val to a symbolic value */
 589 int pvr2_ctrl_value_to_sym(struct pvr2_ctrl *cptr,
 590                            int mask,int val,
 591                            char *buf,unsigned int maxlen,
 592                            unsigned int *len)
 593 {
 594         int ret;
 595         LOCK_TAKE(cptr->hdw->big_lock); do {
 596                 ret = pvr2_ctrl_value_to_sym_internal(cptr,mask,val,
 597                                                       buf,maxlen,len);
 598         } while(0); LOCK_GIVE(cptr->hdw->big_lock);
 599         return ret;
 600 }
 601
 602
 603 /*
 604   Stuff for Emacs to see, in order to encourage consistent editing style:
 605   *** Local Variables: ***
 606   *** mode: c ***
 607   *** fill-column: 75 ***
 608   *** tab-width: 8 ***
 609   *** c-basic-offset: 8 ***
 610   *** End: ***
 611   */