drivers/media/video/pvrusb2/pvrusb2-std.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-std.h"
  23 #include "pvrusb2-debug.h"
  24 #include <asm/string.h>
  25 #include <linux/slab.h>
  26
  27 struct std_name {
  28         const char *name;
  29         v4l2_std_id id;
  30 };
  31
  32
  33 #define CSTD_PAL \
  34         (V4L2_STD_PAL_B| \
  35          V4L2_STD_PAL_B1| \
  36          V4L2_STD_PAL_G| \
  37          V4L2_STD_PAL_H| \
  38          V4L2_STD_PAL_I| \
  39          V4L2_STD_PAL_D| \
  40          V4L2_STD_PAL_D1| \
  41          V4L2_STD_PAL_K| \
  42          V4L2_STD_PAL_M| \
  43          V4L2_STD_PAL_N| \
  44          V4L2_STD_PAL_Nc| \
  45          V4L2_STD_PAL_60)
  46
  47 #define CSTD_NTSC \
  48         (V4L2_STD_NTSC_M| \
  49          V4L2_STD_NTSC_M_JP| \
  50          V4L2_STD_NTSC_M_KR| \
  51          V4L2_STD_NTSC_443)
  52
  53 #define CSTD_SECAM \
  54         (V4L2_STD_SECAM_B| \
  55          V4L2_STD_SECAM_D| \
  56          V4L2_STD_SECAM_G| \
  57          V4L2_STD_SECAM_H| \
  58          V4L2_STD_SECAM_K| \
  59          V4L2_STD_SECAM_K1| \
  60          V4L2_STD_SECAM_L| \
  61          V4L2_STD_SECAM_LC)
  62
  63 #define TSTD_B   (V4L2_STD_PAL_B|V4L2_STD_SECAM_B)
  64 #define TSTD_B1  (V4L2_STD_PAL_B1)
  65 #define TSTD_D   (V4L2_STD_PAL_D|V4L2_STD_SECAM_D)
  66 #define TSTD_D1  (V4L2_STD_PAL_D1)
  67 #define TSTD_G   (V4L2_STD_PAL_G|V4L2_STD_SECAM_G)
  68 #define TSTD_H   (V4L2_STD_PAL_H|V4L2_STD_SECAM_H)
  69 #define TSTD_I   (V4L2_STD_PAL_I)
  70 #define TSTD_K   (V4L2_STD_PAL_K|V4L2_STD_SECAM_K)
  71 #define TSTD_K1  (V4L2_STD_SECAM_K1)
  72 #define TSTD_L   (V4L2_STD_SECAM_L)
  73 #define TSTD_M   (V4L2_STD_PAL_M|V4L2_STD_NTSC_M)
  74 #define TSTD_N   (V4L2_STD_PAL_N)
  75 #define TSTD_Nc  (V4L2_STD_PAL_Nc)
  76 #define TSTD_60  (V4L2_STD_PAL_60)
  77
  78 #define CSTD_ALL (CSTD_PAL|CSTD_NTSC|CSTD_SECAM)
  79
  80 /* Mapping of standard bits to color system */
  81 static const struct std_name std_groups[] = {
  82         {"PAL",CSTD_PAL},
  83         {"NTSC",CSTD_NTSC},
  84         {"SECAM",CSTD_SECAM},
  85 };
  86
  87 /* Mapping of standard bits to modulation system */
  88 static const struct std_name std_items[] = {
  89         {"B",TSTD_B},
  90         {"B1",TSTD_B1},
  91         {"D",TSTD_D},
  92         {"D1",TSTD_D1},
  93         {"G",TSTD_G},
  94         {"H",TSTD_H},
  95         {"I",TSTD_I},
  96         {"K",TSTD_K},
  97         {"K1",TSTD_K1},
  98         {"L",TSTD_L},
  99         {"LC",V4L2_STD_SECAM_LC},
 100         {"M",TSTD_M},
 101         {"Mj",V4L2_STD_NTSC_M_JP},
 102         {"443",V4L2_STD_NTSC_443},
 103         {"Mk",V4L2_STD_NTSC_M_KR},
 104         {"N",TSTD_N},
 105         {"Nc",TSTD_Nc},
 106         {"60",TSTD_60},
 107 };
 108
 109
 110 // Search an array of std_name structures and return a pointer to the
 111 // element with the matching name.
 112 static const struct std_name *find_std_name(const struct std_name *arrPtr,
 113                                             unsigned int arrSize,
 114                                             const char *bufPtr,
 115                                             unsigned int bufSize)
 116 {
 117         unsigned int idx;
 118         const struct std_name *p;
 119         for (idx = 0; idx < arrSize; idx++) {
 120                 p = arrPtr + idx;
 121                 if (strlen(p->name) != bufSize) continue;
 122                 if (!memcmp(bufPtr,p->name,bufSize)) return p;
 123         }
 124         return NULL;
 125 }
 126
 127
 128 int pvr2_std_str_to_id(v4l2_std_id *idPtr,const char *bufPtr,
 129                        unsigned int bufSize)
 130 {
 131         v4l2_std_id id = 0;
 132         v4l2_std_id cmsk = 0;
 133         v4l2_std_id t;
 134         int mMode = 0;
 135         unsigned int cnt;
 136         char ch;
 137         const struct std_name *sp;
 138
 139         while (bufSize) {
 140                 if (!mMode) {
 141                         cnt = 0;
 142                         while ((cnt < bufSize) && (bufPtr[cnt] != '-')) cnt++;
 143                         if (cnt >= bufSize) return 0; // No more characters
 144                         sp = find_std_name(std_groups, ARRAY_SIZE(std_groups),
 145                                            bufPtr,cnt);
 146                         if (!sp) return 0; // Illegal color system name
 147                         cnt++;
 148                         bufPtr += cnt;
 149                         bufSize -= cnt;
 150                         mMode = !0;
 151                         cmsk = sp->id;
 152                         continue;
 153                 }
 154                 cnt = 0;
 155                 while (cnt < bufSize) {
 156                         ch = bufPtr[cnt];
 157                         if (ch == ';') {
 158                                 mMode = 0;
 159                                 break;
 160                         }
 161                         if (ch == '/') break;
 162                         cnt++;
 163                 }
 164                 sp = find_std_name(std_items, ARRAY_SIZE(std_items),
 165                                    bufPtr,cnt);
 166                 if (!sp) return 0; // Illegal modulation system ID
 167                 t = sp->id & cmsk;
 168                 if (!t) return 0; // Specific color + modulation system illegal
 169                 id |= t;
 170                 if (cnt < bufSize) cnt++;
 171                 bufPtr += cnt;
 172                 bufSize -= cnt;
 173         }
 174
 175         if (idPtr) *idPtr = id;
 176         return !0;
 177 }
 178
 179
 180 unsigned int pvr2_std_id_to_str(char *bufPtr, unsigned int bufSize,
 181                                 v4l2_std_id id)
 182 {
 183         unsigned int idx1,idx2;
 184         const struct std_name *ip,*gp;
 185         int gfl,cfl;
 186         unsigned int c1,c2;
 187         cfl = 0;
 188         c1 = 0;
 189         for (idx1 = 0; idx1 < ARRAY_SIZE(std_groups); idx1++) {
 190                 gp = std_groups + idx1;
 191                 gfl = 0;
 192                 for (idx2 = 0; idx2 < ARRAY_SIZE(std_items); idx2++) {
 193                         ip = std_items + idx2;
 194                         if (!(gp->id & ip->id & id)) continue;
 195                         if (!gfl) {
 196                                 if (cfl) {
 197                                         c2 = scnprintf(bufPtr,bufSize,";");
 198                                         c1 += c2;
 199                                         bufSize -= c2;
 200                                         bufPtr += c2;
 201                                 }
 202                                 cfl = !0;
 203                                 c2 = scnprintf(bufPtr,bufSize,
 204                                                "%s-",gp->name);
 205                                 gfl = !0;
 206                         } else {
 207                                 c2 = scnprintf(bufPtr,bufSize,"/");
 208                         }
 209                         c1 += c2;
 210                         bufSize -= c2;
 211                         bufPtr += c2;
 212                         c2 = scnprintf(bufPtr,bufSize,
 213                                        ip->name);
 214                         c1 += c2;
 215                         bufSize -= c2;
 216                         bufPtr += c2;
 217                 }
 218         }
 219         return c1;
 220 }
 221
 222
 223 // Template data for possible enumerated video standards.  Here we group
 224 // standards which share common frame rates and resolution.
 225 static struct v4l2_standard generic_standards[] = {
 226         {
 227                 .id             = (TSTD_B|TSTD_B1|
 228                                    TSTD_D|TSTD_D1|
 229                                    TSTD_G|
 230                                    TSTD_H|
 231                                    TSTD_I|
 232                                    TSTD_K|TSTD_K1|
 233                                    TSTD_L|
 234                                    V4L2_STD_SECAM_LC |
 235                                    TSTD_N|TSTD_Nc),
 236                 .frameperiod    =
 237                 {
 238                         .numerator  = 1,
 239                         .denominator= 25
 240                 },
 241                 .framelines     = 625,
 242                 .reserved       = {0,0,0,0}
 243         }, {
 244                 .id             = (TSTD_M|
 245                                    V4L2_STD_NTSC_M_JP|
 246                                    V4L2_STD_NTSC_M_KR),
 247                 .frameperiod    =
 248                 {
 249                         .numerator  = 1001,
 250                         .denominator= 30000
 251                 },
 252                 .framelines     = 525,
 253                 .reserved       = {0,0,0,0}
 254         }, { // This is a total wild guess
 255                 .id             = (TSTD_60),
 256                 .frameperiod    =
 257                 {
 258                         .numerator  = 1001,
 259                         .denominator= 30000
 260                 },
 261                 .framelines     = 525,
 262                 .reserved       = {0,0,0,0}
 263         }, { // This is total wild guess
 264                 .id             = V4L2_STD_NTSC_443,
 265                 .frameperiod    =
 266                 {
 267                         .numerator  = 1001,
 268                         .denominator= 30000
 269                 },
 270                 .framelines     = 525,
 271                 .reserved       = {0,0,0,0}
 272         }
 273 };
 274
 275 #define generic_standards_cnt ARRAY_SIZE(generic_standards)
 276
 277 static struct v4l2_standard *match_std(v4l2_std_id id)
 278 {
 279         unsigned int idx;
 280         for (idx = 0; idx < generic_standards_cnt; idx++) {
 281                 if (generic_standards[idx].id & id) {
 282                         return generic_standards + idx;
 283                 }
 284         }
 285         return NULL;
 286 }
 287
 288 static int pvr2_std_fill(struct v4l2_standard *std,v4l2_std_id id)
 289 {
 290         struct v4l2_standard *template;
 291         int idx;
 292         unsigned int bcnt;
 293         template = match_std(id);
 294         if (!template) return 0;
 295         idx = std->index;
 296         memcpy(std,template,sizeof(*template));
 297         std->index = idx;
 298         std->id = id;
 299         bcnt = pvr2_std_id_to_str(std->name,sizeof(std->name)-1,id);
 300         std->name[bcnt] = 0;
 301         pvr2_trace(PVR2_TRACE_INIT,"Set up standard idx=%u name=%s",
 302                    std->index,std->name);
 303         return !0;
 304 }
 305
 306 /* These are special cases of combined standards that we should enumerate
 307    separately if the component pieces are present. */
 308 static v4l2_std_id std_mixes[] = {
 309         V4L2_STD_PAL_B | V4L2_STD_PAL_G,
 310         V4L2_STD_PAL_D | V4L2_STD_PAL_K,
 311         V4L2_STD_SECAM_B | V4L2_STD_SECAM_G,
 312         V4L2_STD_SECAM_D | V4L2_STD_SECAM_K,
 313 };
 314
 315 struct v4l2_standard *pvr2_std_create_enum(unsigned int *countptr,
 316                                            v4l2_std_id id)
 317 {
 318         unsigned int std_cnt = 0;
 319         unsigned int idx,bcnt,idx2;
 320         v4l2_std_id idmsk,cmsk,fmsk;
 321         struct v4l2_standard *stddefs;
 322
 323         if (pvrusb2_debug & PVR2_TRACE_INIT) {
 324                 char buf[50];
 325                 bcnt = pvr2_std_id_to_str(buf,sizeof(buf),id);
 326                 pvr2_trace(
 327                         PVR2_TRACE_INIT,"Mapping standards mask=0x%x (%.*s)",
 328                         (int)id,bcnt,buf);
 329         }
 330
 331         *countptr = 0;
 332         std_cnt = 0;
 333         fmsk = 0;
 334         for (idmsk = 1, cmsk = id; cmsk; idmsk <<= 1) {
 335                 if (!(idmsk & cmsk)) continue;
 336                 cmsk &= ~idmsk;
 337                 if (match_std(idmsk)) {
 338                         std_cnt++;
 339                         continue;
 340                 }
 341                 fmsk |= idmsk;
 342         }
 343
 344         for (idx2 = 0; idx2 < ARRAY_SIZE(std_mixes); idx2++) {
 345                 if ((id & std_mixes[idx2]) == std_mixes[idx2]) std_cnt++;
 346         }
 347
 348         if (fmsk) {
 349                 char buf[50];
 350                 bcnt = pvr2_std_id_to_str(buf,sizeof(buf),fmsk);
 351                 pvr2_trace(
 352                         PVR2_TRACE_ERROR_LEGS,
 353                         "WARNING:"
 354                         " Failed to classify the following standard(s): %.*s",
 355                         bcnt,buf);
 356         }
 357
 358         pvr2_trace(PVR2_TRACE_INIT,"Setting up %u unique standard(s)",
 359                    std_cnt);
 360         if (!std_cnt) return NULL; // paranoia
 361
 362         stddefs = kzalloc(sizeof(struct v4l2_standard) * std_cnt,
 363                           GFP_KERNEL);
 364         for (idx = 0; idx < std_cnt; idx++) stddefs[idx].index = idx;
 365
 366         idx = 0;
 367
 368         /* Enumerate potential special cases */
 369         for (idx2 = 0; (idx2 < ARRAY_SIZE(std_mixes)) && (idx < std_cnt);
 370              idx2++) {
 371                 if (!(id & std_mixes[idx2])) continue;
 372                 if (pvr2_std_fill(stddefs+idx,std_mixes[idx2])) idx++;
 373         }
 374         /* Now enumerate individual pieces */
 375         for (idmsk = 1, cmsk = id; cmsk && (idx < std_cnt); idmsk <<= 1) {
 376                 if (!(idmsk & cmsk)) continue;
 377                 cmsk &= ~idmsk;
 378                 if (!pvr2_std_fill(stddefs+idx,idmsk)) continue;
 379                 idx++;
 380         }
 381
 382         *countptr = std_cnt;
 383         return stddefs;
 384 }
 385
 386 v4l2_std_id pvr2_std_get_usable(void)
 387 {
 388         return CSTD_ALL;
 389 }
 390
 391
 392 /*
 393   Stuff for Emacs to see, in order to encourage consistent editing style:
 394   *** Local Variables: ***
 395   *** mode: c ***
 396   *** fill-column: 75 ***
 397   *** tab-width: 8 ***
 398   *** c-basic-offset: 8 ***
 399   *** End: ***
 400   */