git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/v4l2-common.c

   1 /*
   2  *      Video for Linux Two
   3  *
   4  *      A generic video device interface for the LINUX operating system
   5  *      using a set of device structures/vectors for low level operations.
   6  *
   7  *      This file replaces the videodev.c file that comes with the
   8  *      regular kernel distribution.
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  * Author:      Bill Dirks <bdirks@pacbell.net>
  16  *              based on code by Alan Cox, <alan@cymru.net>
  17  *
  18  */
  19
  20 /*
  21  * Video capture interface for Linux
  22  *
  23  *      A generic video device interface for the LINUX operating system
  24  *      using a set of device structures/vectors for low level operations.
  25  *
  26  *              This program is free software; you can redistribute it and/or
  27  *              modify it under the terms of the GNU General Public License
  28  *              as published by the Free Software Foundation; either version
  29  *              2 of the License, or (at your option) any later version.
  30  *
  31  * Author:      Alan Cox, <alan@redhat.com>
  32  *
  33  * Fixes:
  34  */
  35
  36 /*
  37  * Video4linux 1/2 integration by Justin Schoeman
  38  * <justin@suntiger.ee.up.ac.za>
  39  * 2.4 PROCFS support ported from 2.4 kernels by
  40  *  Iñaki García Etxebarria <garetxe@euskalnet.net>
  41  * Makefile fix by "W. Michael Petullo" <mike@flyn.org>
  42  * 2.4 devfs support ported from 2.4 kernels by
  43  *  Dan Merillat <dan@merillat.org>
  44  * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
  45  */
  46
  47 #include <linux/config.h>
  48 #include <linux/module.h>
  49 #include <linux/types.h>
  50 #include <linux/kernel.h>
  51 #include <linux/sched.h>
  52 #include <linux/smp_lock.h>
  53 #include <linux/mm.h>
  54 #include <linux/string.h>
  55 #include <linux/errno.h>
  56 #include <asm/uaccess.h>
  57 #include <asm/system.h>
  58 #include <asm/pgtable.h>
  59 #include <asm/io.h>
  60 #include <asm/div64.h>
  61 #include <linux/video_decoder.h>
  62 #include <media/v4l2-common.h>
  63
  64 #ifdef CONFIG_KMOD
  65 #include <linux/kmod.h>
  66 #endif
  67
  68 #if defined(CONFIG_UST) || defined(CONFIG_UST_MODULE)
  69 #include <linux/ust.h>
  70 #endif
  71
  72
  73 #include <linux/videodev.h>
  74
  75 MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr");
  76 MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers");
  77 MODULE_LICENSE("GPL");
  78
  79 /*
  80  *
  81  *      V 4 L 2   D R I V E R   H E L P E R   A P I
  82  *
  83  */
  84
  85 /*
  86  *  Video Standard Operations (contributed by Michael Schimek)
  87  */
  88
  89
  90 /* Fill in the fields of a v4l2_standard structure according to the
  91    'id' and 'transmission' parameters.  Returns negative on error.  */
  92 int v4l2_video_std_construct(struct v4l2_standard *vs,
  93                              int id, char *name)
  94 {
  95         u32 index = vs->index;
  96
  97         memset(vs, 0, sizeof(struct v4l2_standard));
  98         vs->index = index;
  99         vs->id    = id;
 100         if (id & (V4L2_STD_NTSC | V4L2_STD_PAL_M)) {
 101                 vs->frameperiod.numerator = 1001;
 102                 vs->frameperiod.denominator = 30000;
 103                 vs->framelines = 525;
 104         } else {
 105                 vs->frameperiod.numerator = 1;
 106                 vs->frameperiod.denominator = 25;
 107                 vs->framelines = 625;
 108         }
 109         strlcpy(vs->name,name,sizeof(vs->name));
 110         return 0;
 111 }
 112
 113
 114 /* ----------------------------------------------------------------- */
 115 /* priority handling                                                 */
 116
 117 #define V4L2_PRIO_VALID(val) (val == V4L2_PRIORITY_BACKGROUND   || \
 118                               val == V4L2_PRIORITY_INTERACTIVE  || \
 119                               val == V4L2_PRIORITY_RECORD)
 120
 121 int v4l2_prio_init(struct v4l2_prio_state *global)
 122 {
 123         memset(global,0,sizeof(*global));
 124         return 0;
 125 }
 126
 127 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
 128                      enum v4l2_priority new)
 129 {
 130         if (!V4L2_PRIO_VALID(new))
 131                 return -EINVAL;
 132         if (*local == new)
 133                 return 0;
 134
 135         atomic_inc(&global->prios[new]);
 136         if (V4L2_PRIO_VALID(*local))
 137                 atomic_dec(&global->prios[*local]);
 138         *local = new;
 139         return 0;
 140 }
 141
 142 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local)
 143 {
 144         return v4l2_prio_change(global,local,V4L2_PRIORITY_DEFAULT);
 145 }
 146
 147 int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local)
 148 {
 149         if (V4L2_PRIO_VALID(*local))
 150                 atomic_dec(&global->prios[*local]);
 151         return 0;
 152 }
 153
 154 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global)
 155 {
 156         if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0)
 157                 return V4L2_PRIORITY_RECORD;
 158         if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0)
 159                 return V4L2_PRIORITY_INTERACTIVE;
 160         if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0)
 161                 return V4L2_PRIORITY_BACKGROUND;
 162         return V4L2_PRIORITY_UNSET;
 163 }
 164
 165 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local)
 166 {
 167         if (*local < v4l2_prio_max(global))
 168                 return -EBUSY;
 169         return 0;
 170 }
 171
 172
 173 /* ----------------------------------------------------------------- */
 174 /* some arrays for pretty-printing debug messages                    */
 175
 176 char *v4l2_field_names[] = {
 177         [V4L2_FIELD_ANY]        = "any",
 178         [V4L2_FIELD_NONE]       = "none",
 179         [V4L2_FIELD_TOP]        = "top",
 180         [V4L2_FIELD_BOTTOM]     = "bottom",
 181         [V4L2_FIELD_INTERLACED] = "interlaced",
 182         [V4L2_FIELD_SEQ_TB]     = "seq-tb",
 183         [V4L2_FIELD_SEQ_BT]     = "seq-bt",
 184         [V4L2_FIELD_ALTERNATE]  = "alternate",
 185 };
 186
 187 char *v4l2_type_names[] = {
 188         [V4L2_BUF_TYPE_VIDEO_CAPTURE] = "video-cap",
 189         [V4L2_BUF_TYPE_VIDEO_OVERLAY] = "video-over",
 190         [V4L2_BUF_TYPE_VIDEO_OUTPUT]  = "video-out",
 191         [V4L2_BUF_TYPE_VBI_CAPTURE]   = "vbi-cap",
 192         [V4L2_BUF_TYPE_VBI_OUTPUT]    = "vbi-out",
 193 };
 194
 195 /* ------------------------------------------------------------------ */
 196 /* debug help functions                                               */
 197
 198 #ifdef HAVE_V4L1
 199 static const char *v4l1_ioctls[] = {
 200         [_IOC_NR(VIDIOCGCAP)]       = "VIDIOCGCAP",
 201         [_IOC_NR(VIDIOCGCHAN)]      = "VIDIOCGCHAN",
 202         [_IOC_NR(VIDIOCSCHAN)]      = "VIDIOCSCHAN",
 203         [_IOC_NR(VIDIOCGTUNER)]     = "VIDIOCGTUNER",
 204         [_IOC_NR(VIDIOCSTUNER)]     = "VIDIOCSTUNER",
 205         [_IOC_NR(VIDIOCGPICT)]      = "VIDIOCGPICT",
 206         [_IOC_NR(VIDIOCSPICT)]      = "VIDIOCSPICT",
 207         [_IOC_NR(VIDIOCCAPTURE)]    = "VIDIOCCAPTURE",
 208         [_IOC_NR(VIDIOCGWIN)]       = "VIDIOCGWIN",
 209         [_IOC_NR(VIDIOCSWIN)]       = "VIDIOCSWIN",
 210         [_IOC_NR(VIDIOCGFBUF)]      = "VIDIOCGFBUF",
 211         [_IOC_NR(VIDIOCSFBUF)]      = "VIDIOCSFBUF",
 212         [_IOC_NR(VIDIOCKEY)]        = "VIDIOCKEY",
 213         [_IOC_NR(VIDIOCGFREQ)]      = "VIDIOCGFREQ",
 214         [_IOC_NR(VIDIOCSFREQ)]      = "VIDIOCSFREQ",
 215         [_IOC_NR(VIDIOCGAUDIO)]     = "VIDIOCGAUDIO",
 216         [_IOC_NR(VIDIOCSAUDIO)]     = "VIDIOCSAUDIO",
 217         [_IOC_NR(VIDIOCSYNC)]       = "VIDIOCSYNC",
 218         [_IOC_NR(VIDIOCMCAPTURE)]   = "VIDIOCMCAPTURE",
 219         [_IOC_NR(VIDIOCGMBUF)]      = "VIDIOCGMBUF",
 220         [_IOC_NR(VIDIOCGUNIT)]      = "VIDIOCGUNIT",
 221         [_IOC_NR(VIDIOCGCAPTURE)]   = "VIDIOCGCAPTURE",
 222         [_IOC_NR(VIDIOCSCAPTURE)]   = "VIDIOCSCAPTURE",
 223         [_IOC_NR(VIDIOCSPLAYMODE)]  = "VIDIOCSPLAYMODE",
 224         [_IOC_NR(VIDIOCSWRITEMODE)] = "VIDIOCSWRITEMODE",
 225         [_IOC_NR(VIDIOCGPLAYINFO)]  = "VIDIOCGPLAYINFO",
 226         [_IOC_NR(VIDIOCSMICROCODE)] = "VIDIOCSMICROCODE",
 227         [_IOC_NR(VIDIOCGVBIFMT)]    = "VIDIOCGVBIFMT",
 228         [_IOC_NR(VIDIOCSVBIFMT)]    = "VIDIOCSVBIFMT"
 229 };
 230 #define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
 231 #endif
 232
 233 static const char *v4l2_ioctls[] = {
 234         [_IOC_NR(VIDIOC_QUERYCAP)]         = "VIDIOC_QUERYCAP",
 235         [_IOC_NR(VIDIOC_RESERVED)]         = "VIDIOC_RESERVED",
 236         [_IOC_NR(VIDIOC_ENUM_FMT)]         = "VIDIOC_ENUM_FMT",
 237         [_IOC_NR(VIDIOC_G_FMT)]            = "VIDIOC_G_FMT",
 238         [_IOC_NR(VIDIOC_S_FMT)]            = "VIDIOC_S_FMT",
 239         [_IOC_NR(VIDIOC_G_MPEGCOMP)]       = "VIDIOC_G_MPEGCOMP",
 240         [_IOC_NR(VIDIOC_S_MPEGCOMP)]       = "VIDIOC_S_MPEGCOMP",
 241         [_IOC_NR(VIDIOC_REQBUFS)]          = "VIDIOC_REQBUFS",
 242         [_IOC_NR(VIDIOC_QUERYBUF)]         = "VIDIOC_QUERYBUF",
 243         [_IOC_NR(VIDIOC_G_FBUF)]           = "VIDIOC_G_FBUF",
 244         [_IOC_NR(VIDIOC_S_FBUF)]           = "VIDIOC_S_FBUF",
 245         [_IOC_NR(VIDIOC_OVERLAY)]          = "VIDIOC_OVERLAY",
 246         [_IOC_NR(VIDIOC_QBUF)]             = "VIDIOC_QBUF",
 247         [_IOC_NR(VIDIOC_DQBUF)]            = "VIDIOC_DQBUF",
 248         [_IOC_NR(VIDIOC_STREAMON)]         = "VIDIOC_STREAMON",
 249         [_IOC_NR(VIDIOC_STREAMOFF)]        = "VIDIOC_STREAMOFF",
 250         [_IOC_NR(VIDIOC_G_PARM)]           = "VIDIOC_G_PARM",
 251         [_IOC_NR(VIDIOC_S_PARM)]           = "VIDIOC_S_PARM",
 252         [_IOC_NR(VIDIOC_G_STD)]            = "VIDIOC_G_STD",
 253         [_IOC_NR(VIDIOC_S_STD)]            = "VIDIOC_S_STD",
 254         [_IOC_NR(VIDIOC_ENUMSTD)]          = "VIDIOC_ENUMSTD",
 255         [_IOC_NR(VIDIOC_ENUMINPUT)]        = "VIDIOC_ENUMINPUT",
 256         [_IOC_NR(VIDIOC_G_CTRL)]           = "VIDIOC_G_CTRL",
 257         [_IOC_NR(VIDIOC_S_CTRL)]           = "VIDIOC_S_CTRL",
 258         [_IOC_NR(VIDIOC_G_TUNER)]          = "VIDIOC_G_TUNER",
 259         [_IOC_NR(VIDIOC_S_TUNER)]          = "VIDIOC_S_TUNER",
 260         [_IOC_NR(VIDIOC_G_AUDIO)]          = "VIDIOC_G_AUDIO",
 261         [_IOC_NR(VIDIOC_S_AUDIO)]          = "VIDIOC_S_AUDIO",
 262         [_IOC_NR(VIDIOC_QUERYCTRL)]        = "VIDIOC_QUERYCTRL",
 263         [_IOC_NR(VIDIOC_QUERYMENU)]        = "VIDIOC_QUERYMENU",
 264         [_IOC_NR(VIDIOC_G_INPUT)]          = "VIDIOC_G_INPUT",
 265         [_IOC_NR(VIDIOC_S_INPUT)]          = "VIDIOC_S_INPUT",
 266         [_IOC_NR(VIDIOC_G_OUTPUT)]         = "VIDIOC_G_OUTPUT",
 267         [_IOC_NR(VIDIOC_S_OUTPUT)]         = "VIDIOC_S_OUTPUT",
 268         [_IOC_NR(VIDIOC_ENUMOUTPUT)]       = "VIDIOC_ENUMOUTPUT",
 269         [_IOC_NR(VIDIOC_G_AUDOUT)]         = "VIDIOC_G_AUDOUT",
 270         [_IOC_NR(VIDIOC_S_AUDOUT)]         = "VIDIOC_S_AUDOUT",
 271         [_IOC_NR(VIDIOC_G_MODULATOR)]      = "VIDIOC_G_MODULATOR",
 272         [_IOC_NR(VIDIOC_S_MODULATOR)]      = "VIDIOC_S_MODULATOR",
 273         [_IOC_NR(VIDIOC_G_FREQUENCY)]      = "VIDIOC_G_FREQUENCY",
 274         [_IOC_NR(VIDIOC_S_FREQUENCY)]      = "VIDIOC_S_FREQUENCY",
 275         [_IOC_NR(VIDIOC_CROPCAP)]          = "VIDIOC_CROPCAP",
 276         [_IOC_NR(VIDIOC_G_CROP)]           = "VIDIOC_G_CROP",
 277         [_IOC_NR(VIDIOC_S_CROP)]           = "VIDIOC_S_CROP",
 278         [_IOC_NR(VIDIOC_G_JPEGCOMP)]       = "VIDIOC_G_JPEGCOMP",
 279         [_IOC_NR(VIDIOC_S_JPEGCOMP)]       = "VIDIOC_S_JPEGCOMP",
 280         [_IOC_NR(VIDIOC_QUERYSTD)]         = "VIDIOC_QUERYSTD",
 281         [_IOC_NR(VIDIOC_TRY_FMT)]          = "VIDIOC_TRY_FMT",
 282         [_IOC_NR(VIDIOC_ENUMAUDIO)]        = "VIDIOC_ENUMAUDIO",
 283         [_IOC_NR(VIDIOC_ENUMAUDOUT)]       = "VIDIOC_ENUMAUDOUT",
 284         [_IOC_NR(VIDIOC_G_PRIORITY)]       = "VIDIOC_G_PRIORITY",
 285         [_IOC_NR(VIDIOC_S_PRIORITY)]       = "VIDIOC_S_PRIORITY",
 286 #if 1
 287         [_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
 288 #endif
 289         [_IOC_NR(VIDIOC_LOG_STATUS)]       = "VIDIOC_LOG_STATUS"
 290 };
 291 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
 292
 293 static const char *v4l2_int_ioctls[] = {
 294 #ifdef HAVE_VIDEO_DECODER
 295         [_IOC_NR(DECODER_GET_CAPABILITIES)]    = "DECODER_GET_CAPABILITIES",
 296         [_IOC_NR(DECODER_GET_STATUS)]          = "DECODER_GET_STATUS",
 297         [_IOC_NR(DECODER_SET_NORM)]            = "DECODER_SET_NORM",
 298         [_IOC_NR(DECODER_SET_INPUT)]           = "DECODER_SET_INPUT",
 299         [_IOC_NR(DECODER_SET_OUTPUT)]          = "DECODER_SET_OUTPUT",
 300         [_IOC_NR(DECODER_ENABLE_OUTPUT)]       = "DECODER_ENABLE_OUTPUT",
 301         [_IOC_NR(DECODER_SET_PICTURE)]         = "DECODER_SET_PICTURE",
 302         [_IOC_NR(DECODER_SET_GPIO)]            = "DECODER_SET_GPIO",
 303         [_IOC_NR(DECODER_INIT)]                = "DECODER_INIT",
 304         [_IOC_NR(DECODER_SET_VBI_BYPASS)]      = "DECODER_SET_VBI_BYPASS",
 305         [_IOC_NR(DECODER_DUMP)]                = "DECODER_DUMP",
 306 #endif
 307         [_IOC_NR(AUDC_SET_RADIO)]              = "AUDC_SET_RADIO",
 308         [_IOC_NR(AUDC_SET_INPUT)]              = "AUDC_SET_INPUT",
 309
 310         [_IOC_NR(TUNER_SET_TYPE_ADDR)]         = "TUNER_SET_TYPE_ADDR",
 311         [_IOC_NR(TUNER_SET_STANDBY)]           = "TUNER_SET_STANDBY",
 312         [_IOC_NR(TDA9887_SET_CONFIG)]          = "TDA9887_SET_CONFIG",
 313
 314         [_IOC_NR(VIDIOC_INT_S_REGISTER)]       = "VIDIOC_INT_S_REGISTER",
 315         [_IOC_NR(VIDIOC_INT_G_REGISTER)]       = "VIDIOC_INT_G_REGISTER",
 316         [_IOC_NR(VIDIOC_INT_RESET)]            = "VIDIOC_INT_RESET",
 317         [_IOC_NR(VIDIOC_INT_AUDIO_CLOCK_FREQ)] = "VIDIOC_INT_AUDIO_CLOCK_FREQ",
 318         [_IOC_NR(VIDIOC_INT_DECODE_VBI_LINE)]  = "VIDIOC_INT_DECODE_VBI_LINE",
 319         [_IOC_NR(VIDIOC_INT_S_VBI_DATA)]       = "VIDIOC_INT_S_VBI_DATA",
 320         [_IOC_NR(VIDIOC_INT_G_VBI_DATA)]       = "VIDIOC_INT_G_VBI_DATA",
 321         [_IOC_NR(VIDIOC_INT_G_CHIP_IDENT)]     = "VIDIOC_INT_G_CHIP_IDENT",
 322         [_IOC_NR(VIDIOC_INT_I2S_CLOCK_FREQ)]   = "VIDIOC_INT_I2S_CLOCK_FREQ"
 323 };
 324 #define V4L2_INT_IOCTLS ARRAY_SIZE(v4l2_int_ioctls)
 325
 326 /* Common ioctl debug function. This function can be used by
 327    external ioctl messages as well as internal V4L ioctl */
 328 void v4l_printk_ioctl(unsigned int cmd)
 329 {
 330         char *dir;
 331
 332         switch (_IOC_DIR(cmd)) {
 333         case _IOC_NONE:              dir = "--"; break;
 334         case _IOC_READ:              dir = "r-"; break;
 335         case _IOC_WRITE:             dir = "-w"; break;
 336         case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
 337         default:                     dir = "*ERR*"; break;
 338         }
 339         switch (_IOC_TYPE(cmd)) {
 340         case 'd':
 341                 printk("v4l2_int ioctl %s, dir=%s (0x%08x)\n",
 342                        (_IOC_NR(cmd) < V4L2_INT_IOCTLS) ?
 343                        v4l2_int_ioctls[_IOC_NR(cmd)] : "UNKNOWN", dir, cmd);
 344                 break;
 345 #ifdef HAVE_V4L1
 346         case 'v':
 347                 printk("v4l1 ioctl %s, dir=%s (0x%08x)\n",
 348                        (_IOC_NR(cmd) < V4L1_IOCTLS) ?
 349                        v4l1_ioctls[_IOC_NR(cmd)] : "UNKNOWN", dir, cmd);
 350                 break;
 351 #endif
 352         case 'V':
 353                 printk("v4l2 ioctl %s, dir=%s (0x%08x)\n",
 354                        (_IOC_NR(cmd) < V4L2_IOCTLS) ?
 355                        v4l2_ioctls[_IOC_NR(cmd)] : "UNKNOWN", dir, cmd);
 356                 break;
 357
 358         default:
 359                 printk("unknown ioctl '%c', dir=%s, #%d (0x%08x)\n",
 360                        _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
 361         }
 362 }
 363
 364 /* ----------------------------------------------------------------- */
 365
 366 EXPORT_SYMBOL(v4l2_video_std_construct);
 367
 368 EXPORT_SYMBOL(v4l2_prio_init);
 369 EXPORT_SYMBOL(v4l2_prio_change);
 370 EXPORT_SYMBOL(v4l2_prio_open);
 371 EXPORT_SYMBOL(v4l2_prio_close);
 372 EXPORT_SYMBOL(v4l2_prio_max);
 373 EXPORT_SYMBOL(v4l2_prio_check);
 374
 375 EXPORT_SYMBOL(v4l2_field_names);
 376 EXPORT_SYMBOL(v4l2_type_names);
 377 EXPORT_SYMBOL(v4l_printk_ioctl);
 378
 379 /*
 380  * Local variables:
 381  * c-basic-offset: 8
 382  * End:
 383  */