drivers/media/usb/pvrusb2/pvrusb2-std.c

   1 /*
   2  *
   3  *
   4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include "pvrusb2-std.h"
  18 #include "pvrusb2-debug.h"
  19 #include <asm/string.h>
  20 #include <linux/slab.h>
  21
  22 struct std_name {
  23         const char *name;
  24         v4l2_std_id id;
  25 };
  26
  27
  28 #define CSTD_PAL \
  29         (V4L2_STD_PAL_B| \
  30          V4L2_STD_PAL_B1| \
  31          V4L2_STD_PAL_G| \
  32          V4L2_STD_PAL_H| \
  33          V4L2_STD_PAL_I| \
  34          V4L2_STD_PAL_D| \
  35          V4L2_STD_PAL_D1| \
  36          V4L2_STD_PAL_K| \
  37          V4L2_STD_PAL_M| \
  38          V4L2_STD_PAL_N| \
  39          V4L2_STD_PAL_Nc| \
  40          V4L2_STD_PAL_60)
  41
  42 #define CSTD_NTSC \
  43         (V4L2_STD_NTSC_M| \
  44          V4L2_STD_NTSC_M_JP| \
  45          V4L2_STD_NTSC_M_KR| \
  46          V4L2_STD_NTSC_443)
  47
  48 #define CSTD_ATSC \
  49         (V4L2_STD_ATSC_8_VSB| \
  50          V4L2_STD_ATSC_16_VSB)
  51
  52 #define CSTD_SECAM \
  53         (V4L2_STD_SECAM_B| \
  54          V4L2_STD_SECAM_D| \
  55          V4L2_STD_SECAM_G| \
  56          V4L2_STD_SECAM_H| \
  57          V4L2_STD_SECAM_K| \
  58          V4L2_STD_SECAM_K1| \
  59          V4L2_STD_SECAM_L| \
  60          V4L2_STD_SECAM_LC)
  61
  62 #define TSTD_B   (V4L2_STD_PAL_B|V4L2_STD_SECAM_B)
  63 #define TSTD_B1  (V4L2_STD_PAL_B1)
  64 #define TSTD_D   (V4L2_STD_PAL_D|V4L2_STD_SECAM_D)
  65 #define TSTD_D1  (V4L2_STD_PAL_D1)
  66 #define TSTD_G   (V4L2_STD_PAL_G|V4L2_STD_SECAM_G)
  67 #define TSTD_H   (V4L2_STD_PAL_H|V4L2_STD_SECAM_H)
  68 #define TSTD_I   (V4L2_STD_PAL_I)
  69 #define TSTD_K   (V4L2_STD_PAL_K|V4L2_STD_SECAM_K)
  70 #define TSTD_K1  (V4L2_STD_SECAM_K1)
  71 #define TSTD_L   (V4L2_STD_SECAM_L)
  72 #define TSTD_M   (V4L2_STD_PAL_M|V4L2_STD_NTSC_M)
  73 #define TSTD_N   (V4L2_STD_PAL_N)
  74 #define TSTD_Nc  (V4L2_STD_PAL_Nc)
  75 #define TSTD_60  (V4L2_STD_PAL_60)
  76
  77 #define CSTD_ALL (CSTD_PAL|CSTD_NTSC|CSTD_ATSC|CSTD_SECAM)
  78
  79 /* Mapping of standard bits to color system */
  80 static const struct std_name std_groups[] = {
  81         {"PAL",CSTD_PAL},
  82         {"NTSC",CSTD_NTSC},
  83         {"SECAM",CSTD_SECAM},
  84         {"ATSC",CSTD_ATSC},
  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         {"8VSB",V4L2_STD_ATSC_8_VSB},
 108         {"16VSB",V4L2_STD_ATSC_16_VSB},
 109 };
 110
 111
 112 // Search an array of std_name structures and return a pointer to the
 113 // element with the matching name.
 114 static const struct std_name *find_std_name(const struct std_name *arrPtr,
 115                                             unsigned int arrSize,
 116                                             const char *bufPtr,
 117                                             unsigned int bufSize)
 118 {
 119         unsigned int idx;
 120         const struct std_name *p;
 121         for (idx = 0; idx < arrSize; idx++) {
 122                 p = arrPtr + idx;
 123                 if (strlen(p->name) != bufSize) continue;
 124                 if (!memcmp(bufPtr,p->name,bufSize)) return p;
 125         }
 126         return NULL;
 127 }
 128
 129
 130 int pvr2_std_str_to_id(v4l2_std_id *idPtr,const char *bufPtr,
 131                        unsigned int bufSize)
 132 {
 133         v4l2_std_id id = 0;
 134         v4l2_std_id cmsk = 0;
 135         v4l2_std_id t;
 136         int mMode = 0;
 137         unsigned int cnt;
 138         char ch;
 139         const struct std_name *sp;
 140
 141         while (bufSize) {
 142                 if (!mMode) {
 143                         cnt = 0;
 144                         while ((cnt < bufSize) && (bufPtr[cnt] != '-')) cnt++;
 145                         if (cnt >= bufSize) return 0; // No more characters
 146                         sp = find_std_name(std_groups, ARRAY_SIZE(std_groups),
 147                                            bufPtr,cnt);
 148                         if (!sp) return 0; // Illegal color system name
 149                         cnt++;
 150                         bufPtr += cnt;
 151                         bufSize -= cnt;
 152                         mMode = !0;
 153                         cmsk = sp->id;
 154                         continue;
 155                 }
 156                 cnt = 0;
 157                 while (cnt < bufSize) {
 158                         ch = bufPtr[cnt];
 159                         if (ch == ';') {
 160                                 mMode = 0;
 161                                 break;
 162                         }
 163                         if (ch == '/') break;
 164                         cnt++;
 165                 }
 166                 sp = find_std_name(std_items, ARRAY_SIZE(std_items),
 167                                    bufPtr,cnt);
 168                 if (!sp) return 0; // Illegal modulation system ID
 169                 t = sp->id & cmsk;
 170                 if (!t) return 0; // Specific color + modulation system illegal
 171                 id |= t;
 172                 if (cnt < bufSize) cnt++;
 173                 bufPtr += cnt;
 174                 bufSize -= cnt;
 175         }
 176
 177         if (idPtr) *idPtr = id;
 178         return !0;
 179 }
 180
 181
 182 unsigned int pvr2_std_id_to_str(char *bufPtr, unsigned int bufSize,
 183                                 v4l2_std_id id)
 184 {
 185         unsigned int idx1,idx2;
 186         const struct std_name *ip,*gp;
 187         int gfl,cfl;
 188         unsigned int c1,c2;
 189         cfl = 0;
 190         c1 = 0;
 191         for (idx1 = 0; idx1 < ARRAY_SIZE(std_groups); idx1++) {
 192                 gp = std_groups + idx1;
 193                 gfl = 0;
 194                 for (idx2 = 0; idx2 < ARRAY_SIZE(std_items); idx2++) {
 195                         ip = std_items + idx2;
 196                         if (!(gp->id & ip->id & id)) continue;
 197                         if (!gfl) {
 198                                 if (cfl) {
 199                                         c2 = scnprintf(bufPtr,bufSize,";");
 200                                         c1 += c2;
 201                                         bufSize -= c2;
 202                                         bufPtr += c2;
 203                                 }
 204                                 cfl = !0;
 205                                 c2 = scnprintf(bufPtr,bufSize,
 206                                                "%s-",gp->name);
 207                                 gfl = !0;
 208                         } else {
 209                                 c2 = scnprintf(bufPtr,bufSize,"/");
 210                         }
 211                         c1 += c2;
 212                         bufSize -= c2;
 213                         bufPtr += c2;
 214                         c2 = scnprintf(bufPtr,bufSize,
 215                                        ip->name);
 216                         c1 += c2;
 217                         bufSize -= c2;
 218                         bufPtr += c2;
 219                 }
 220         }
 221         return c1;
 222 }
 223
 224
 225 // Template data for possible enumerated video standards.  Here we group
 226 // standards which share common frame rates and resolution.
 227 static struct v4l2_standard generic_standards[] = {
 228         {
 229                 .id             = (TSTD_B|TSTD_B1|
 230                                    TSTD_D|TSTD_D1|
 231                                    TSTD_G|
 232                                    TSTD_H|
 233                                    TSTD_I|
 234                                    TSTD_K|TSTD_K1|
 235                                    TSTD_L|
 236                                    V4L2_STD_SECAM_LC |
 237                                    TSTD_N|TSTD_Nc),
 238                 .frameperiod    =
 239                 {
 240                         .numerator  = 1,
 241                         .denominator= 25
 242                 },
 243                 .framelines     = 625,
 244                 .reserved       = {0,0,0,0}
 245         }, {
 246                 .id             = (TSTD_M|
 247                                    V4L2_STD_NTSC_M_JP|
 248                                    V4L2_STD_NTSC_M_KR),
 249                 .frameperiod    =
 250                 {
 251                         .numerator  = 1001,
 252                         .denominator= 30000
 253                 },
 254                 .framelines     = 525,
 255                 .reserved       = {0,0,0,0}
 256         }, { // This is a total wild guess
 257                 .id             = (TSTD_60),
 258                 .frameperiod    =
 259                 {
 260                         .numerator  = 1001,
 261                         .denominator= 30000
 262                 },
 263                 .framelines     = 525,
 264                 .reserved       = {0,0,0,0}
 265         }, { // This is total wild guess
 266                 .id             = V4L2_STD_NTSC_443,
 267                 .frameperiod    =
 268                 {
 269                         .numerator  = 1001,
 270                         .denominator= 30000
 271                 },
 272                 .framelines     = 525,
 273                 .reserved       = {0,0,0,0}
 274         }
 275 };
 276
 277 static struct v4l2_standard *match_std(v4l2_std_id id)
 278 {
 279         unsigned int idx;
 280         for (idx = 0; idx < ARRAY_SIZE(generic_standards); 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_STD,"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_STD) {
 324                 char buf[100];
 325                 bcnt = pvr2_std_id_to_str(buf,sizeof(buf),id);
 326                 pvr2_trace(
 327                         PVR2_TRACE_STD,"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         /* Don't complain about ATSC standard values */
 349         fmsk &= ~CSTD_ATSC;
 350
 351         if (fmsk) {
 352                 char buf[100];
 353                 bcnt = pvr2_std_id_to_str(buf,sizeof(buf),fmsk);
 354                 pvr2_trace(
 355                         PVR2_TRACE_ERROR_LEGS,
 356                         "WARNING: Failed to classify the following standard(s): %.*s",
 357                         bcnt,buf);
 358         }
 359
 360         pvr2_trace(PVR2_TRACE_STD,"Setting up %u unique standard(s)",
 361                    std_cnt);
 362         if (!std_cnt) return NULL; // paranoia
 363
 364         stddefs = kzalloc(sizeof(struct v4l2_standard) * std_cnt,
 365                           GFP_KERNEL);
 366         if (!stddefs)
 367                 return NULL;
 368
 369         for (idx = 0; idx < std_cnt; idx++)
 370                 stddefs[idx].index = idx;
 371
 372         idx = 0;
 373
 374         /* Enumerate potential special cases */
 375         for (idx2 = 0; (idx2 < ARRAY_SIZE(std_mixes)) && (idx < std_cnt);
 376              idx2++) {
 377                 if (!(id & std_mixes[idx2])) continue;
 378                 if (pvr2_std_fill(stddefs+idx,std_mixes[idx2])) idx++;
 379         }
 380         /* Now enumerate individual pieces */
 381         for (idmsk = 1, cmsk = id; cmsk && (idx < std_cnt); idmsk <<= 1) {
 382                 if (!(idmsk & cmsk)) continue;
 383                 cmsk &= ~idmsk;
 384                 if (!pvr2_std_fill(stddefs+idx,idmsk)) continue;
 385                 idx++;
 386         }
 387
 388         *countptr = std_cnt;
 389         return stddefs;
 390 }
 391
 392 v4l2_std_id pvr2_std_get_usable(void)
 393 {
 394         return CSTD_ALL;
 395 }