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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *
   4 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5 */
   6
   7#include "pvrusb2-std.h"
   8#include "pvrusb2-debug.h"
   9#include <asm/string.h>
  10#include <linux/slab.h>
  11
  12struct std_name {
  13        const char *name;
  14        v4l2_std_id id;
  15};
  16
  17
  18#define CSTD_PAL \
  19        (V4L2_STD_PAL_B| \
  20         V4L2_STD_PAL_B1| \
  21         V4L2_STD_PAL_G| \
  22         V4L2_STD_PAL_H| \
  23         V4L2_STD_PAL_I| \
  24         V4L2_STD_PAL_D| \
  25         V4L2_STD_PAL_D1| \
  26         V4L2_STD_PAL_K| \
  27         V4L2_STD_PAL_M| \
  28         V4L2_STD_PAL_N| \
  29         V4L2_STD_PAL_Nc| \
  30         V4L2_STD_PAL_60)
  31
  32#define CSTD_NTSC \
  33        (V4L2_STD_NTSC_M| \
  34         V4L2_STD_NTSC_M_JP| \
  35         V4L2_STD_NTSC_M_KR| \
  36         V4L2_STD_NTSC_443)
  37
  38#define CSTD_ATSC \
  39        (V4L2_STD_ATSC_8_VSB| \
  40         V4L2_STD_ATSC_16_VSB)
  41
  42#define CSTD_SECAM \
  43        (V4L2_STD_SECAM_B| \
  44         V4L2_STD_SECAM_D| \
  45         V4L2_STD_SECAM_G| \
  46         V4L2_STD_SECAM_H| \
  47         V4L2_STD_SECAM_K| \
  48         V4L2_STD_SECAM_K1| \
  49         V4L2_STD_SECAM_L| \
  50         V4L2_STD_SECAM_LC)
  51
  52#define TSTD_B   (V4L2_STD_PAL_B|V4L2_STD_SECAM_B)
  53#define TSTD_B1  (V4L2_STD_PAL_B1)
  54#define TSTD_D   (V4L2_STD_PAL_D|V4L2_STD_SECAM_D)
  55#define TSTD_D1  (V4L2_STD_PAL_D1)
  56#define TSTD_G   (V4L2_STD_PAL_G|V4L2_STD_SECAM_G)
  57#define TSTD_H   (V4L2_STD_PAL_H|V4L2_STD_SECAM_H)
  58#define TSTD_I   (V4L2_STD_PAL_I)
  59#define TSTD_K   (V4L2_STD_PAL_K|V4L2_STD_SECAM_K)
  60#define TSTD_K1  (V4L2_STD_SECAM_K1)
  61#define TSTD_L   (V4L2_STD_SECAM_L)
  62#define TSTD_M   (V4L2_STD_PAL_M|V4L2_STD_NTSC_M)
  63#define TSTD_N   (V4L2_STD_PAL_N)
  64#define TSTD_Nc  (V4L2_STD_PAL_Nc)
  65#define TSTD_60  (V4L2_STD_PAL_60)
  66
  67#define CSTD_ALL (CSTD_PAL|CSTD_NTSC|CSTD_ATSC|CSTD_SECAM)
  68
  69/* Mapping of standard bits to color system */
  70static const struct std_name std_groups[] = {
  71        {"PAL",CSTD_PAL},
  72        {"NTSC",CSTD_NTSC},
  73        {"SECAM",CSTD_SECAM},
  74        {"ATSC",CSTD_ATSC},
  75};
  76
  77/* Mapping of standard bits to modulation system */
  78static const struct std_name std_items[] = {
  79        {"B",TSTD_B},
  80        {"B1",TSTD_B1},
  81        {"D",TSTD_D},
  82        {"D1",TSTD_D1},
  83        {"G",TSTD_G},
  84        {"H",TSTD_H},
  85        {"I",TSTD_I},
  86        {"K",TSTD_K},
  87        {"K1",TSTD_K1},
  88        {"L",TSTD_L},
  89        {"LC",V4L2_STD_SECAM_LC},
  90        {"M",TSTD_M},
  91        {"Mj",V4L2_STD_NTSC_M_JP},
  92        {"443",V4L2_STD_NTSC_443},
  93        {"Mk",V4L2_STD_NTSC_M_KR},
  94        {"N",TSTD_N},
  95        {"Nc",TSTD_Nc},
  96        {"60",TSTD_60},
  97        {"8VSB",V4L2_STD_ATSC_8_VSB},
  98        {"16VSB",V4L2_STD_ATSC_16_VSB},
  99};
 100
 101
 102// Search an array of std_name structures and return a pointer to the
 103// element with the matching name.
 104static const struct std_name *find_std_name(const struct std_name *arrPtr,
 105                                            unsigned int arrSize,
 106                                            const char *bufPtr,
 107                                            unsigned int bufSize)
 108{
 109        unsigned int idx;
 110        const struct std_name *p;
 111        for (idx = 0; idx < arrSize; idx++) {
 112                p = arrPtr + idx;
 113                if (strlen(p->name) != bufSize) continue;
 114                if (!memcmp(bufPtr,p->name,bufSize)) return p;
 115        }
 116        return NULL;
 117}
 118
 119
 120int pvr2_std_str_to_id(v4l2_std_id *idPtr,const char *bufPtr,
 121                       unsigned int bufSize)
 122{
 123        v4l2_std_id id = 0;
 124        v4l2_std_id cmsk = 0;
 125        v4l2_std_id t;
 126        int mMode = 0;
 127        unsigned int cnt;
 128        char ch;
 129        const struct std_name *sp;
 130
 131        while (bufSize) {
 132                if (!mMode) {
 133                        cnt = 0;
 134                        while ((cnt < bufSize) && (bufPtr[cnt] != '-')) cnt++;
 135                        if (cnt >= bufSize) return 0; // No more characters
 136                        sp = find_std_name(std_groups, ARRAY_SIZE(std_groups),
 137                                           bufPtr,cnt);
 138                        if (!sp) return 0; // Illegal color system name
 139                        cnt++;
 140                        bufPtr += cnt;
 141                        bufSize -= cnt;
 142                        mMode = !0;
 143                        cmsk = sp->id;
 144                        continue;
 145                }
 146                cnt = 0;
 147                while (cnt < bufSize) {
 148                        ch = bufPtr[cnt];
 149                        if (ch == ';') {
 150                                mMode = 0;
 151                                break;
 152                        }
 153                        if (ch == '/') break;
 154                        cnt++;
 155                }
 156                sp = find_std_name(std_items, ARRAY_SIZE(std_items),
 157                                   bufPtr,cnt);
 158                if (!sp) return 0; // Illegal modulation system ID
 159                t = sp->id & cmsk;
 160                if (!t) return 0; // Specific color + modulation system illegal
 161                id |= t;
 162                if (cnt < bufSize) cnt++;
 163                bufPtr += cnt;
 164                bufSize -= cnt;
 165        }
 166
 167        if (idPtr) *idPtr = id;
 168        return !0;
 169}
 170
 171
 172unsigned int pvr2_std_id_to_str(char *bufPtr, unsigned int bufSize,
 173                                v4l2_std_id id)
 174{
 175        unsigned int idx1,idx2;
 176        const struct std_name *ip,*gp;
 177        int gfl,cfl;
 178        unsigned int c1,c2;
 179        cfl = 0;
 180        c1 = 0;
 181        for (idx1 = 0; idx1 < ARRAY_SIZE(std_groups); idx1++) {
 182                gp = std_groups + idx1;
 183                gfl = 0;
 184                for (idx2 = 0; idx2 < ARRAY_SIZE(std_items); idx2++) {
 185                        ip = std_items + idx2;
 186                        if (!(gp->id & ip->id & id)) continue;
 187                        if (!gfl) {
 188                                if (cfl) {
 189                                        c2 = scnprintf(bufPtr,bufSize,";");
 190                                        c1 += c2;
 191                                        bufSize -= c2;
 192                                        bufPtr += c2;
 193                                }
 194                                cfl = !0;
 195                                c2 = scnprintf(bufPtr,bufSize,
 196                                               "%s-",gp->name);
 197                                gfl = !0;
 198                        } else {
 199                                c2 = scnprintf(bufPtr,bufSize,"/");
 200                        }
 201                        c1 += c2;
 202                        bufSize -= c2;
 203                        bufPtr += c2;
 204                        c2 = scnprintf(bufPtr,bufSize,
 205                                       ip->name);
 206                        c1 += c2;
 207                        bufSize -= c2;
 208                        bufPtr += c2;
 209                }
 210        }
 211        return c1;
 212}
 213
 214
 215// Template data for possible enumerated video standards.  Here we group
 216// standards which share common frame rates and resolution.
 217static struct v4l2_standard generic_standards[] = {
 218        {
 219                .id             = (TSTD_B|TSTD_B1|
 220                                   TSTD_D|TSTD_D1|
 221                                   TSTD_G|
 222                                   TSTD_H|
 223                                   TSTD_I|
 224                                   TSTD_K|TSTD_K1|
 225                                   TSTD_L|
 226                                   V4L2_STD_SECAM_LC |
 227                                   TSTD_N|TSTD_Nc),
 228                .frameperiod    =
 229                {
 230                        .numerator  = 1,
 231                        .denominator= 25
 232                },
 233                .framelines     = 625,
 234                .reserved       = {0,0,0,0}
 235        }, {
 236                .id             = (TSTD_M|
 237                                   V4L2_STD_NTSC_M_JP|
 238                                   V4L2_STD_NTSC_M_KR),
 239                .frameperiod    =
 240                {
 241                        .numerator  = 1001,
 242                        .denominator= 30000
 243                },
 244                .framelines     = 525,
 245                .reserved       = {0,0,0,0}
 246        }, { // This is a total wild guess
 247                .id             = (TSTD_60),
 248                .frameperiod    =
 249                {
 250                        .numerator  = 1001,
 251                        .denominator= 30000
 252                },
 253                .framelines     = 525,
 254                .reserved       = {0,0,0,0}
 255        }, { // This is total wild guess
 256                .id             = V4L2_STD_NTSC_443,
 257                .frameperiod    =
 258                {
 259                        .numerator  = 1001,
 260                        .denominator= 30000
 261                },
 262                .framelines     = 525,
 263                .reserved       = {0,0,0,0}
 264        }
 265};
 266
 267static struct v4l2_standard *match_std(v4l2_std_id id)
 268{
 269        unsigned int idx;
 270        for (idx = 0; idx < ARRAY_SIZE(generic_standards); idx++) {
 271                if (generic_standards[idx].id & id) {
 272                        return generic_standards + idx;
 273                }
 274        }
 275        return NULL;
 276}
 277
 278static int pvr2_std_fill(struct v4l2_standard *std,v4l2_std_id id)
 279{
 280        struct v4l2_standard *template;
 281        int idx;
 282        unsigned int bcnt;
 283        template = match_std(id);
 284        if (!template) return 0;
 285        idx = std->index;
 286        memcpy(std,template,sizeof(*template));
 287        std->index = idx;
 288        std->id = id;
 289        bcnt = pvr2_std_id_to_str(std->name,sizeof(std->name)-1,id);
 290        std->name[bcnt] = 0;
 291        pvr2_trace(PVR2_TRACE_STD,"Set up standard idx=%u name=%s",
 292                   std->index,std->name);
 293        return !0;
 294}
 295
 296/* These are special cases of combined standards that we should enumerate
 297   separately if the component pieces are present. */
 298static v4l2_std_id std_mixes[] = {
 299        V4L2_STD_PAL_B | V4L2_STD_PAL_G,
 300        V4L2_STD_PAL_D | V4L2_STD_PAL_K,
 301        V4L2_STD_SECAM_B | V4L2_STD_SECAM_G,
 302        V4L2_STD_SECAM_D | V4L2_STD_SECAM_K,
 303};
 304
 305struct v4l2_standard *pvr2_std_create_enum(unsigned int *countptr,
 306                                           v4l2_std_id id)
 307{
 308        unsigned int std_cnt = 0;
 309        unsigned int idx,bcnt,idx2;
 310        v4l2_std_id idmsk,cmsk,fmsk;
 311        struct v4l2_standard *stddefs;
 312
 313        if (pvrusb2_debug & PVR2_TRACE_STD) {
 314                char buf[100];
 315                bcnt = pvr2_std_id_to_str(buf,sizeof(buf),id);
 316                pvr2_trace(
 317                        PVR2_TRACE_STD,"Mapping standards mask=0x%x (%.*s)",
 318                        (int)id,bcnt,buf);
 319        }
 320
 321        *countptr = 0;
 322        std_cnt = 0;
 323        fmsk = 0;
 324        for (idmsk = 1, cmsk = id; cmsk; idmsk <<= 1) {
 325                if (!(idmsk & cmsk)) continue;
 326                cmsk &= ~idmsk;
 327                if (match_std(idmsk)) {
 328                        std_cnt++;
 329                        continue;
 330                }
 331                fmsk |= idmsk;
 332        }
 333
 334        for (idx2 = 0; idx2 < ARRAY_SIZE(std_mixes); idx2++) {
 335                if ((id & std_mixes[idx2]) == std_mixes[idx2]) std_cnt++;
 336        }
 337
 338        /* Don't complain about ATSC standard values */
 339        fmsk &= ~CSTD_ATSC;
 340
 341        if (fmsk) {
 342                char buf[100];
 343                bcnt = pvr2_std_id_to_str(buf,sizeof(buf),fmsk);
 344                pvr2_trace(
 345                        PVR2_TRACE_ERROR_LEGS,
 346                        "***WARNING*** Failed to classify the following standard(s): %.*s",
 347                        bcnt,buf);
 348        }
 349
 350        pvr2_trace(PVR2_TRACE_STD,"Setting up %u unique standard(s)",
 351                   std_cnt);
 352        if (!std_cnt) return NULL; // paranoia
 353
 354        stddefs = kcalloc(std_cnt, sizeof(struct v4l2_standard),
 355                          GFP_KERNEL);
 356        if (!stddefs)
 357                return NULL;
 358
 359        for (idx = 0; idx < std_cnt; idx++)
 360                stddefs[idx].index = idx;
 361
 362        idx = 0;
 363
 364        /* Enumerate potential special cases */
 365        for (idx2 = 0; (idx2 < ARRAY_SIZE(std_mixes)) && (idx < std_cnt);
 366             idx2++) {
 367                if (!(id & std_mixes[idx2])) continue;
 368                if (pvr2_std_fill(stddefs+idx,std_mixes[idx2])) idx++;
 369        }
 370        /* Now enumerate individual pieces */
 371        for (idmsk = 1, cmsk = id; cmsk && (idx < std_cnt); idmsk <<= 1) {
 372                if (!(idmsk & cmsk)) continue;
 373                cmsk &= ~idmsk;
 374                if (!pvr2_std_fill(stddefs+idx,idmsk)) continue;
 375                idx++;
 376        }
 377
 378        *countptr = std_cnt;
 379        return stddefs;
 380}
 381
 382v4l2_std_id pvr2_std_get_usable(void)
 383{
 384        return CSTD_ALL;
 385}
 386