sound/core/oss/pcm_oss.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer / OSS compatible
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #if 0
   8 #define PLUGIN_DEBUG
   9 #endif
  10 #if 0
  11 #define OSS_DEBUG
  12 #endif
  13
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched/signal.h>
  17 #include <linux/time.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/module.h>
  20 #include <linux/math64.h>
  21 #include <linux/string.h>
  22 #include <linux/compat.h>
  23 #include <sound/core.h>
  24 #include <sound/minors.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include "pcm_plugin.h"
  28 #include <sound/info.h>
  29 #include <linux/soundcard.h>
  30 #include <sound/initval.h>
  31 #include <sound/mixer_oss.h>
  32
  33 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
  34
  35 static int dsp_map[SNDRV_CARDS];
  36 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  37 static bool nonblock_open = 1;
  38
  39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  40 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  41 MODULE_LICENSE("GPL");
  42 module_param_array(dsp_map, int, NULL, 0444);
  43 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  44 module_param_array(adsp_map, int, NULL, 0444);
  45 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  46 module_param(nonblock_open, bool, 0644);
  47 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  48 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  49 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
  50
  51 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  52 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  53 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
  54
  55 /*
  56  * helper functions to process hw_params
  57  */
  58 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  59 {
  60         int changed = 0;
  61         if (i->min < min) {
  62                 i->min = min;
  63                 i->openmin = openmin;
  64                 changed = 1;
  65         } else if (i->min == min && !i->openmin && openmin) {
  66                 i->openmin = 1;
  67                 changed = 1;
  68         }
  69         if (i->integer) {
  70                 if (i->openmin) {
  71                         i->min++;
  72                         i->openmin = 0;
  73                 }
  74         }
  75         if (snd_interval_checkempty(i)) {
  76                 snd_interval_none(i);
  77                 return -EINVAL;
  78         }
  79         return changed;
  80 }
  81
  82 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
  83 {
  84         int changed = 0;
  85         if (i->max > max) {
  86                 i->max = max;
  87                 i->openmax = openmax;
  88                 changed = 1;
  89         } else if (i->max == max && !i->openmax && openmax) {
  90                 i->openmax = 1;
  91                 changed = 1;
  92         }
  93         if (i->integer) {
  94                 if (i->openmax) {
  95                         i->max--;
  96                         i->openmax = 0;
  97                 }
  98         }
  99         if (snd_interval_checkempty(i)) {
 100                 snd_interval_none(i);
 101                 return -EINVAL;
 102         }
 103         return changed;
 104 }
 105
 106 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 107 {
 108         struct snd_interval t;
 109         t.empty = 0;
 110         t.min = t.max = val;
 111         t.openmin = t.openmax = 0;
 112         t.integer = 1;
 113         return snd_interval_refine(i, &t);
 114 }
 115
 116 /**
 117  * snd_pcm_hw_param_value_min
 118  * @params: the hw_params instance
 119  * @var: parameter to retrieve
 120  * @dir: pointer to the direction (-1,0,1) or NULL
 121  *
 122  * Return the minimum value for field PAR.
 123  */
 124 static unsigned int
 125 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
 126                            snd_pcm_hw_param_t var, int *dir)
 127 {
 128         if (hw_is_mask(var)) {
 129                 if (dir)
 130                         *dir = 0;
 131                 return snd_mask_min(hw_param_mask_c(params, var));
 132         }
 133         if (hw_is_interval(var)) {
 134                 const struct snd_interval *i = hw_param_interval_c(params, var);
 135                 if (dir)
 136                         *dir = i->openmin;
 137                 return snd_interval_min(i);
 138         }
 139         return -EINVAL;
 140 }
 141
 142 /**
 143  * snd_pcm_hw_param_value_max
 144  * @params: the hw_params instance
 145  * @var: parameter to retrieve
 146  * @dir: pointer to the direction (-1,0,1) or NULL
 147  *
 148  * Return the maximum value for field PAR.
 149  */
 150 static int
 151 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
 152                            snd_pcm_hw_param_t var, int *dir)
 153 {
 154         if (hw_is_mask(var)) {
 155                 if (dir)
 156                         *dir = 0;
 157                 return snd_mask_max(hw_param_mask_c(params, var));
 158         }
 159         if (hw_is_interval(var)) {
 160                 const struct snd_interval *i = hw_param_interval_c(params, var);
 161                 if (dir)
 162                         *dir = - (int) i->openmax;
 163                 return snd_interval_max(i);
 164         }
 165         return -EINVAL;
 166 }
 167
 168 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
 169                                   snd_pcm_hw_param_t var,
 170                                   const struct snd_mask *val)
 171 {
 172         int changed;
 173         changed = snd_mask_refine(hw_param_mask(params, var), val);
 174         if (changed > 0) {
 175                 params->cmask |= 1 << var;
 176                 params->rmask |= 1 << var;
 177         }
 178         return changed;
 179 }
 180
 181 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
 182                                  struct snd_pcm_hw_params *params,
 183                                  snd_pcm_hw_param_t var,
 184                                  const struct snd_mask *val)
 185 {
 186         int changed = _snd_pcm_hw_param_mask(params, var, val);
 187         if (changed < 0)
 188                 return changed;
 189         if (params->rmask) {
 190                 int err = snd_pcm_hw_refine(pcm, params);
 191                 if (err < 0)
 192                         return err;
 193         }
 194         return 0;
 195 }
 196
 197 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
 198                                  snd_pcm_hw_param_t var, unsigned int val,
 199                                  int dir)
 200 {
 201         int changed;
 202         int open = 0;
 203         if (dir) {
 204                 if (dir > 0) {
 205                         open = 1;
 206                 } else if (dir < 0) {
 207                         if (val > 0) {
 208                                 open = 1;
 209                                 val--;
 210                         }
 211                 }
 212         }
 213         if (hw_is_mask(var))
 214                 changed = snd_mask_refine_min(hw_param_mask(params, var),
 215                                               val + !!open);
 216         else if (hw_is_interval(var))
 217                 changed = snd_interval_refine_min(hw_param_interval(params, var),
 218                                                   val, open);
 219         else
 220                 return -EINVAL;
 221         if (changed > 0) {
 222                 params->cmask |= 1 << var;
 223                 params->rmask |= 1 << var;
 224         }
 225         return changed;
 226 }
 227
 228 /**
 229  * snd_pcm_hw_param_min
 230  * @pcm: PCM instance
 231  * @params: the hw_params instance
 232  * @var: parameter to retrieve
 233  * @val: minimal value
 234  * @dir: pointer to the direction (-1,0,1) or NULL
 235  *
 236  * Inside configuration space defined by PARAMS remove from PAR all
 237  * values < VAL. Reduce configuration space accordingly.
 238  * Return new minimum or -EINVAL if the configuration space is empty
 239  */
 240 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
 241                                 struct snd_pcm_hw_params *params,
 242                                 snd_pcm_hw_param_t var, unsigned int val,
 243                                 int *dir)
 244 {
 245         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
 246         if (changed < 0)
 247                 return changed;
 248         if (params->rmask) {
 249                 int err = snd_pcm_hw_refine(pcm, params);
 250                 if (err < 0)
 251                         return err;
 252         }
 253         return snd_pcm_hw_param_value_min(params, var, dir);
 254 }
 255
 256 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
 257                                  snd_pcm_hw_param_t var, unsigned int val,
 258                                  int dir)
 259 {
 260         int changed;
 261         int open = 0;
 262         if (dir) {
 263                 if (dir < 0) {
 264                         open = 1;
 265                 } else if (dir > 0) {
 266                         open = 1;
 267                         val++;
 268                 }
 269         }
 270         if (hw_is_mask(var)) {
 271                 if (val == 0 && open) {
 272                         snd_mask_none(hw_param_mask(params, var));
 273                         changed = -EINVAL;
 274                 } else
 275                         changed = snd_mask_refine_max(hw_param_mask(params, var),
 276                                                       val - !!open);
 277         } else if (hw_is_interval(var))
 278                 changed = snd_interval_refine_max(hw_param_interval(params, var),
 279                                                   val, open);
 280         else
 281                 return -EINVAL;
 282         if (changed > 0) {
 283                 params->cmask |= 1 << var;
 284                 params->rmask |= 1 << var;
 285         }
 286         return changed;
 287 }
 288
 289 /**
 290  * snd_pcm_hw_param_max
 291  * @pcm: PCM instance
 292  * @params: the hw_params instance
 293  * @var: parameter to retrieve
 294  * @val: maximal value
 295  * @dir: pointer to the direction (-1,0,1) or NULL
 296  *
 297  * Inside configuration space defined by PARAMS remove from PAR all
 298  *  values >= VAL + 1. Reduce configuration space accordingly.
 299  *  Return new maximum or -EINVAL if the configuration space is empty
 300  */
 301 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
 302                                 struct snd_pcm_hw_params *params,
 303                                 snd_pcm_hw_param_t var, unsigned int val,
 304                                 int *dir)
 305 {
 306         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
 307         if (changed < 0)
 308                 return changed;
 309         if (params->rmask) {
 310                 int err = snd_pcm_hw_refine(pcm, params);
 311                 if (err < 0)
 312                         return err;
 313         }
 314         return snd_pcm_hw_param_value_max(params, var, dir);
 315 }
 316
 317 static int boundary_sub(int a, int adir,
 318                         int b, int bdir,
 319                         int *c, int *cdir)
 320 {
 321         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
 322         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
 323         *c = a - b;
 324         *cdir = adir - bdir;
 325         if (*cdir == -2) {
 326                 (*c)--;
 327         } else if (*cdir == 2) {
 328                 (*c)++;
 329         }
 330         return 0;
 331 }
 332
 333 static int boundary_lt(unsigned int a, int adir,
 334                        unsigned int b, int bdir)
 335 {
 336         if (adir < 0) {
 337                 a--;
 338                 adir = 1;
 339         } else if (adir > 0)
 340                 adir = 1;
 341         if (bdir < 0) {
 342                 b--;
 343                 bdir = 1;
 344         } else if (bdir > 0)
 345                 bdir = 1;
 346         return a < b || (a == b && adir < bdir);
 347 }
 348
 349 /* Return 1 if min is nearer to best than max */
 350 static int boundary_nearer(int min, int mindir,
 351                            int best, int bestdir,
 352                            int max, int maxdir)
 353 {
 354         int dmin, dmindir;
 355         int dmax, dmaxdir;
 356         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
 357         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
 358         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
 359 }
 360
 361 /**
 362  * snd_pcm_hw_param_near
 363  * @pcm: PCM instance
 364  * @params: the hw_params instance
 365  * @var: parameter to retrieve
 366  * @best: value to set
 367  * @dir: pointer to the direction (-1,0,1) or NULL
 368  *
 369  * Inside configuration space defined by PARAMS set PAR to the available value
 370  * nearest to VAL. Reduce configuration space accordingly.
 371  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
 372  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
 373  * Return the value found.
 374   */
 375 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 376                                  struct snd_pcm_hw_params *params,
 377                                  snd_pcm_hw_param_t var, unsigned int best,
 378                                  int *dir)
 379 {
 380         struct snd_pcm_hw_params *save = NULL;
 381         int v;
 382         unsigned int saved_min;
 383         int last = 0;
 384         int min, max;
 385         int mindir, maxdir;
 386         int valdir = dir ? *dir : 0;
 387         /* FIXME */
 388         if (best > INT_MAX)
 389                 best = INT_MAX;
 390         min = max = best;
 391         mindir = maxdir = valdir;
 392         if (maxdir > 0)
 393                 maxdir = 0;
 394         else if (maxdir == 0)
 395                 maxdir = -1;
 396         else {
 397                 maxdir = 1;
 398                 max--;
 399         }
 400         save = kmalloc(sizeof(*save), GFP_KERNEL);
 401         if (save == NULL)
 402                 return -ENOMEM;
 403         *save = *params;
 404         saved_min = min;
 405         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
 406         if (min >= 0) {
 407                 struct snd_pcm_hw_params *params1;
 408                 if (max < 0)
 409                         goto _end;
 410                 if ((unsigned int)min == saved_min && mindir == valdir)
 411                         goto _end;
 412                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
 413                 if (params1 == NULL) {
 414                         kfree(save);
 415                         return -ENOMEM;
 416                 }
 417                 *params1 = *save;
 418                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
 419                 if (max < 0) {
 420                         kfree(params1);
 421                         goto _end;
 422                 }
 423                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
 424                         *params = *params1;
 425                         last = 1;
 426                 }
 427                 kfree(params1);
 428         } else {
 429                 *params = *save;
 430                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
 431                 if (max < 0) {
 432                         kfree(save);
 433                         return max;
 434                 }
 435                 last = 1;
 436         }
 437  _end:
 438         kfree(save);
 439         if (last)
 440                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
 441         else
 442                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
 443         return v;
 444 }
 445
 446 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
 447                                  snd_pcm_hw_param_t var, unsigned int val,
 448                                  int dir)
 449 {
 450         int changed;
 451         if (hw_is_mask(var)) {
 452                 struct snd_mask *m = hw_param_mask(params, var);
 453                 if (val == 0 && dir < 0) {
 454                         changed = -EINVAL;
 455                         snd_mask_none(m);
 456                 } else {
 457                         if (dir > 0)
 458                                 val++;
 459                         else if (dir < 0)
 460                                 val--;
 461                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
 462                 }
 463         } else if (hw_is_interval(var)) {
 464                 struct snd_interval *i = hw_param_interval(params, var);
 465                 if (val == 0 && dir < 0) {
 466                         changed = -EINVAL;
 467                         snd_interval_none(i);
 468                 } else if (dir == 0)
 469                         changed = snd_interval_refine_set(i, val);
 470                 else {
 471                         struct snd_interval t;
 472                         t.openmin = 1;
 473                         t.openmax = 1;
 474                         t.empty = 0;
 475                         t.integer = 0;
 476                         if (dir < 0) {
 477                                 t.min = val - 1;
 478                                 t.max = val;
 479                         } else {
 480                                 t.min = val;
 481                                 t.max = val+1;
 482                         }
 483                         changed = snd_interval_refine(i, &t);
 484                 }
 485         } else
 486                 return -EINVAL;
 487         if (changed > 0) {
 488                 params->cmask |= 1 << var;
 489                 params->rmask |= 1 << var;
 490         }
 491         return changed;
 492 }
 493
 494 /**
 495  * snd_pcm_hw_param_set
 496  * @pcm: PCM instance
 497  * @params: the hw_params instance
 498  * @var: parameter to retrieve
 499  * @val: value to set
 500  * @dir: pointer to the direction (-1,0,1) or NULL
 501  *
 502  * Inside configuration space defined by PARAMS remove from PAR all
 503  * values != VAL. Reduce configuration space accordingly.
 504  *  Return VAL or -EINVAL if the configuration space is empty
 505  */
 506 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 507                                 struct snd_pcm_hw_params *params,
 508                                 snd_pcm_hw_param_t var, unsigned int val,
 509                                 int dir)
 510 {
 511         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
 512         if (changed < 0)
 513                 return changed;
 514         if (params->rmask) {
 515                 int err = snd_pcm_hw_refine(pcm, params);
 516                 if (err < 0)
 517                         return err;
 518         }
 519         return snd_pcm_hw_param_value(params, var, NULL);
 520 }
 521
 522 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
 523                                         snd_pcm_hw_param_t var)
 524 {
 525         int changed;
 526         changed = snd_interval_setinteger(hw_param_interval(params, var));
 527         if (changed > 0) {
 528                 params->cmask |= 1 << var;
 529                 params->rmask |= 1 << var;
 530         }
 531         return changed;
 532 }
 533
 534 /*
 535  * plugin
 536  */
 537
 538 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 539 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 540 {
 541         struct snd_pcm_runtime *runtime = substream->runtime;
 542         struct snd_pcm_plugin *plugin, *next;
 543
 544         plugin = runtime->oss.plugin_first;
 545         while (plugin) {
 546                 next = plugin->next;
 547                 snd_pcm_plugin_free(plugin);
 548                 plugin = next;
 549         }
 550         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
 551         return 0;
 552 }
 553
 554 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
 555 {
 556         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 557         plugin->next = runtime->oss.plugin_first;
 558         plugin->prev = NULL;
 559         if (runtime->oss.plugin_first) {
 560                 runtime->oss.plugin_first->prev = plugin;
 561                 runtime->oss.plugin_first = plugin;
 562         } else {
 563                 runtime->oss.plugin_last =
 564                 runtime->oss.plugin_first = plugin;
 565         }
 566         return 0;
 567 }
 568
 569 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
 570 {
 571         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 572         plugin->next = NULL;
 573         plugin->prev = runtime->oss.plugin_last;
 574         if (runtime->oss.plugin_last) {
 575                 runtime->oss.plugin_last->next = plugin;
 576                 runtime->oss.plugin_last = plugin;
 577         } else {
 578                 runtime->oss.plugin_last =
 579                 runtime->oss.plugin_first = plugin;
 580         }
 581         return 0;
 582 }
 583 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
 584
 585 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
 586 {
 587         struct snd_pcm_runtime *runtime = substream->runtime;
 588         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 589         long bytes = frames_to_bytes(runtime, frames);
 590         if (buffer_size == runtime->oss.buffer_bytes)
 591                 return bytes;
 592 #if BITS_PER_LONG >= 64
 593         return runtime->oss.buffer_bytes * bytes / buffer_size;
 594 #else
 595         {
 596                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
 597                 return div_u64(bsize, buffer_size);
 598         }
 599 #endif
 600 }
 601
 602 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 603 {
 604         struct snd_pcm_runtime *runtime = substream->runtime;
 605         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 606         if (buffer_size == runtime->oss.buffer_bytes)
 607                 return bytes_to_frames(runtime, bytes);
 608         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 609 }
 610
 611 static inline
 612 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 613 {
 614         return runtime->hw_ptr_interrupt;
 615 }
 616
 617 /* define extended formats in the recent OSS versions (if any) */
 618 /* linear formats */
 619 #define AFMT_S32_LE      0x00001000
 620 #define AFMT_S32_BE      0x00002000
 621 #define AFMT_S24_LE      0x00008000
 622 #define AFMT_S24_BE      0x00010000
 623 #define AFMT_S24_PACKED  0x00040000
 624
 625 /* other supported formats */
 626 #define AFMT_FLOAT       0x00004000
 627 #define AFMT_SPDIF_RAW   0x00020000
 628
 629 /* unsupported formats */
 630 #define AFMT_AC3         0x00000400
 631 #define AFMT_VORBIS      0x00000800
 632
 633 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
 634 {
 635         switch (format) {
 636         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
 637         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
 638         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
 639         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
 640         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
 641         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
 642         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
 643         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
 644         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
 645         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
 646         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
 647         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
 648         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
 649         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
 650         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
 651         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
 652         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
 653         default:                return SNDRV_PCM_FORMAT_U8;
 654         }
 655 }
 656
 657 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
 658 {
 659         switch (format) {
 660         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
 661         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
 662         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
 663         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
 664         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
 665         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
 666         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
 667         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
 668         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
 669         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
 670         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
 671         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
 672         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
 673         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
 674         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
 675         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
 676         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
 677         default:                        return -EINVAL;
 678         }
 679 }
 680
 681 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
 682                                    struct snd_pcm_hw_params *oss_params,
 683                                    struct snd_pcm_hw_params *slave_params)
 684 {
 685         ssize_t s;
 686         ssize_t oss_buffer_size;
 687         ssize_t oss_period_size, oss_periods;
 688         ssize_t min_period_size, max_period_size;
 689         struct snd_pcm_runtime *runtime = substream->runtime;
 690         size_t oss_frame_size;
 691
 692         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
 693                          params_channels(oss_params) / 8;
 694
 695         oss_buffer_size = snd_pcm_hw_param_value_max(slave_params,
 696                                                      SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 697                                                      NULL);
 698         if (oss_buffer_size <= 0)
 699                 return -EINVAL;
 700         oss_buffer_size = snd_pcm_plug_client_size(substream,
 701                                                    oss_buffer_size * oss_frame_size);
 702         if (oss_buffer_size <= 0)
 703                 return -EINVAL;
 704         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
 705         if (atomic_read(&substream->mmap_count)) {
 706                 if (oss_buffer_size > runtime->oss.mmap_bytes)
 707                         oss_buffer_size = runtime->oss.mmap_bytes;
 708         }
 709
 710         if (substream->oss.setup.period_size > 16)
 711                 oss_period_size = substream->oss.setup.period_size;
 712         else if (runtime->oss.fragshift) {
 713                 oss_period_size = 1 << runtime->oss.fragshift;
 714                 if (oss_period_size > oss_buffer_size / 2)
 715                         oss_period_size = oss_buffer_size / 2;
 716         } else {
 717                 int sd;
 718                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
 719
 720                 oss_period_size = oss_buffer_size;
 721                 do {
 722                         oss_period_size /= 2;
 723                 } while (oss_period_size > bytes_per_sec);
 724                 if (runtime->oss.subdivision == 0) {
 725                         sd = 4;
 726                         if (oss_period_size / sd > 4096)
 727                                 sd *= 2;
 728                         if (oss_period_size / sd < 4096)
 729                                 sd = 1;
 730                 } else
 731                         sd = runtime->oss.subdivision;
 732                 oss_period_size /= sd;
 733                 if (oss_period_size < 16)
 734                         oss_period_size = 16;
 735         }
 736
 737         min_period_size = snd_pcm_plug_client_size(substream,
 738                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 739         if (min_period_size > 0) {
 740                 min_period_size *= oss_frame_size;
 741                 min_period_size = roundup_pow_of_two(min_period_size);
 742                 if (oss_period_size < min_period_size)
 743                         oss_period_size = min_period_size;
 744         }
 745
 746         max_period_size = snd_pcm_plug_client_size(substream,
 747                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 748         if (max_period_size > 0) {
 749                 max_period_size *= oss_frame_size;
 750                 max_period_size = rounddown_pow_of_two(max_period_size);
 751                 if (oss_period_size > max_period_size)
 752                         oss_period_size = max_period_size;
 753         }
 754
 755         oss_periods = oss_buffer_size / oss_period_size;
 756
 757         if (substream->oss.setup.periods > 1)
 758                 oss_periods = substream->oss.setup.periods;
 759
 760         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 761         if (s > 0 && runtime->oss.maxfrags && s > runtime->oss.maxfrags)
 762                 s = runtime->oss.maxfrags;
 763         if (oss_periods > s)
 764                 oss_periods = s;
 765
 766         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 767         if (s < 2)
 768                 s = 2;
 769         if (oss_periods < s)
 770                 oss_periods = s;
 771
 772         while (oss_period_size * oss_periods > oss_buffer_size)
 773                 oss_period_size /= 2;
 774
 775         if (oss_period_size < 16)
 776                 return -EINVAL;
 777
 778         /* don't allocate too large period; 1MB period must be enough */
 779         if (oss_period_size > 1024 * 1024)
 780                 return -ENOMEM;
 781
 782         runtime->oss.period_bytes = oss_period_size;
 783         runtime->oss.period_frames = 1;
 784         runtime->oss.periods = oss_periods;
 785         return 0;
 786 }
 787
 788 static int choose_rate(struct snd_pcm_substream *substream,
 789                        struct snd_pcm_hw_params *params, unsigned int best_rate)
 790 {
 791         const struct snd_interval *it;
 792         struct snd_pcm_hw_params *save;
 793         unsigned int rate, prev;
 794
 795         save = kmalloc(sizeof(*save), GFP_KERNEL);
 796         if (save == NULL)
 797                 return -ENOMEM;
 798         *save = *params;
 799         it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
 800
 801         /* try multiples of the best rate */
 802         rate = best_rate;
 803         for (;;) {
 804                 if (it->max < rate || (it->max == rate && it->openmax))
 805                         break;
 806                 if (it->min < rate || (it->min == rate && !it->openmin)) {
 807                         int ret;
 808                         ret = snd_pcm_hw_param_set(substream, params,
 809                                                    SNDRV_PCM_HW_PARAM_RATE,
 810                                                    rate, 0);
 811                         if (ret == (int)rate) {
 812                                 kfree(save);
 813                                 return rate;
 814                         }
 815                         *params = *save;
 816                 }
 817                 prev = rate;
 818                 rate += best_rate;
 819                 if (rate <= prev)
 820                         break;
 821         }
 822
 823         /* not found, use the nearest rate */
 824         kfree(save);
 825         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
 826 }
 827
 828 /* parameter locking: returns immediately if tried during streaming */
 829 static int lock_params(struct snd_pcm_runtime *runtime)
 830 {
 831         if (mutex_lock_interruptible(&runtime->oss.params_lock))
 832                 return -ERESTARTSYS;
 833         if (atomic_read(&runtime->oss.rw_ref)) {
 834                 mutex_unlock(&runtime->oss.params_lock);
 835                 return -EBUSY;
 836         }
 837         return 0;
 838 }
 839
 840 static void unlock_params(struct snd_pcm_runtime *runtime)
 841 {
 842         mutex_unlock(&runtime->oss.params_lock);
 843 }
 844
 845 /* call with params_lock held */
 846 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
 847 {
 848         struct snd_pcm_runtime *runtime = substream->runtime;
 849         struct snd_pcm_hw_params *params, *sparams;
 850         struct snd_pcm_sw_params *sw_params;
 851         ssize_t oss_buffer_size, oss_period_size;
 852         size_t oss_frame_size;
 853         int err;
 854         int direct;
 855         snd_pcm_format_t format, sformat;
 856         int n;
 857         const struct snd_mask *sformat_mask;
 858         struct snd_mask mask;
 859
 860         if (!runtime->oss.params)
 861                 return 0;
 862         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
 863         params = kmalloc(sizeof(*params), GFP_KERNEL);
 864         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
 865         if (!sw_params || !params || !sparams) {
 866                 err = -ENOMEM;
 867                 goto failure;
 868         }
 869
 870         if (atomic_read(&substream->mmap_count))
 871                 direct = 1;
 872         else
 873                 direct = substream->oss.setup.direct;
 874
 875         _snd_pcm_hw_params_any(sparams);
 876         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
 877         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
 878         snd_mask_none(&mask);
 879         if (atomic_read(&substream->mmap_count))
 880                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
 881         else {
 882                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 883                 if (!direct)
 884                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 885         }
 886         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
 887         if (err < 0) {
 888                 pcm_dbg(substream->pcm, "No usable accesses\n");
 889                 err = -EINVAL;
 890                 goto failure;
 891         }
 892
 893         err = choose_rate(substream, sparams, runtime->oss.rate);
 894         if (err < 0)
 895                 goto failure;
 896         err = snd_pcm_hw_param_near(substream, sparams,
 897                                     SNDRV_PCM_HW_PARAM_CHANNELS,
 898                                     runtime->oss.channels, NULL);
 899         if (err < 0)
 900                 goto failure;
 901
 902         format = snd_pcm_oss_format_from(runtime->oss.format);
 903
 904         sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
 905         if (direct)
 906                 sformat = format;
 907         else
 908                 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
 909
 910         if ((__force int)sformat < 0 ||
 911             !snd_mask_test_format(sformat_mask, sformat)) {
 912                 pcm_for_each_format(sformat) {
 913                         if (snd_mask_test_format(sformat_mask, sformat) &&
 914                             snd_pcm_oss_format_to(sformat) >= 0)
 915                                 goto format_found;
 916                 }
 917                 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
 918                 err = -EINVAL;
 919                 goto failure;
 920         }
 921  format_found:
 922         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
 923         if (err < 0)
 924                 goto failure;
 925
 926         if (direct) {
 927                 memcpy(params, sparams, sizeof(*params));
 928         } else {
 929                 _snd_pcm_hw_params_any(params);
 930                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
 931                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
 932                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
 933                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
 934                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
 935                                       runtime->oss.channels, 0);
 936                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
 937                                       runtime->oss.rate, 0);
 938                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
 939                          params_access(params), params_format(params),
 940                          params_channels(params), params_rate(params));
 941         }
 942         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
 943                  params_access(sparams), params_format(sparams),
 944                  params_channels(sparams), params_rate(sparams));
 945
 946         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
 947                          params_channels(params) / 8;
 948
 949         err = snd_pcm_oss_period_size(substream, params, sparams);
 950         if (err < 0)
 951                 goto failure;
 952
 953         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
 954         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
 955         if (err < 0)
 956                 goto failure;
 957
 958         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
 959                                      runtime->oss.periods, NULL);
 960         if (err < 0)
 961                 goto failure;
 962
 963         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
 964
 965         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
 966         if (err < 0) {
 967                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
 968                 goto failure;
 969         }
 970
 971 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 972         snd_pcm_oss_plugin_clear(substream);
 973         if (!direct) {
 974                 /* add necessary plugins */
 975                 snd_pcm_oss_plugin_clear(substream);
 976                 err = snd_pcm_plug_format_plugins(substream, params, sparams);
 977                 if (err < 0) {
 978                         pcm_dbg(substream->pcm,
 979                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
 980                         snd_pcm_oss_plugin_clear(substream);
 981                         goto failure;
 982                 }
 983                 if (runtime->oss.plugin_first) {
 984                         struct snd_pcm_plugin *plugin;
 985                         err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
 986                         if (err < 0) {
 987                                 pcm_dbg(substream->pcm,
 988                                         "snd_pcm_plugin_build_io failed: %i\n", err);
 989                                 snd_pcm_oss_plugin_clear(substream);
 990                                 goto failure;
 991                         }
 992                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 993                                 err = snd_pcm_plugin_append(plugin);
 994                         } else {
 995                                 err = snd_pcm_plugin_insert(plugin);
 996                         }
 997                         if (err < 0) {
 998                                 snd_pcm_oss_plugin_clear(substream);
 999                                 goto failure;
1000                         }
1001                 }
1002         }
1003 #endif
1004
1005         if (runtime->oss.trigger) {
1006                 sw_params->start_threshold = 1;
1007         } else {
1008                 sw_params->start_threshold = runtime->boundary;
1009         }
1010         if (atomic_read(&substream->mmap_count) ||
1011             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1012                 sw_params->stop_threshold = runtime->boundary;
1013         else
1014                 sw_params->stop_threshold = runtime->buffer_size;
1015         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1016         sw_params->period_step = 1;
1017         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1018                 1 : runtime->period_size;
1019         if (atomic_read(&substream->mmap_count) ||
1020             substream->oss.setup.nosilence) {
1021                 sw_params->silence_threshold = 0;
1022                 sw_params->silence_size = 0;
1023         } else {
1024                 snd_pcm_uframes_t frames;
1025                 frames = runtime->period_size + 16;
1026                 if (frames > runtime->buffer_size)
1027                         frames = runtime->buffer_size;
1028                 sw_params->silence_threshold = frames;
1029                 sw_params->silence_size = frames;
1030         }
1031
1032         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1033         if (err < 0) {
1034                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1035                 goto failure;
1036         }
1037
1038         runtime->oss.periods = params_periods(sparams);
1039         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1040         if (oss_period_size < 0) {
1041                 err = -EINVAL;
1042                 goto failure;
1043         }
1044 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1045         if (runtime->oss.plugin_first) {
1046                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1047                 if (err < 0)
1048                         goto failure;
1049         }
1050 #endif
1051         oss_period_size = array_size(oss_period_size, oss_frame_size);
1052         oss_buffer_size = array_size(oss_period_size, runtime->oss.periods);
1053         if (oss_buffer_size <= 0) {
1054                 err = -EINVAL;
1055                 goto failure;
1056         }
1057
1058         runtime->oss.period_bytes = oss_period_size;
1059         runtime->oss.buffer_bytes = oss_buffer_size;
1060
1061         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1062                  runtime->oss.period_bytes,
1063                  runtime->oss.buffer_bytes);
1064         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1065                  params_period_size(sparams),
1066                  params_buffer_size(sparams));
1067
1068         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1069         runtime->oss.channels = params_channels(params);
1070         runtime->oss.rate = params_rate(params);
1071
1072         kvfree(runtime->oss.buffer);
1073         runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1074         if (!runtime->oss.buffer) {
1075                 err = -ENOMEM;
1076                 goto failure;
1077         }
1078
1079         runtime->oss.params = 0;
1080         runtime->oss.prepare = 1;
1081         runtime->oss.buffer_used = 0;
1082         if (runtime->dma_area)
1083                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1084
1085         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1086
1087         err = 0;
1088 failure:
1089         kfree(sw_params);
1090         kfree(params);
1091         kfree(sparams);
1092         return err;
1093 }
1094
1095 /* this one takes the lock by itself */
1096 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1097                                      bool trylock)
1098 {
1099         struct snd_pcm_runtime *runtime = substream->runtime;
1100         int err;
1101
1102         if (trylock) {
1103                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1104                         return -EAGAIN;
1105         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1106                 return -ERESTARTSYS;
1107
1108         err = snd_pcm_oss_change_params_locked(substream);
1109         mutex_unlock(&runtime->oss.params_lock);
1110         return err;
1111 }
1112
1113 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1114 {
1115         int idx, err;
1116         struct snd_pcm_substream *asubstream = NULL, *substream;
1117
1118         for (idx = 0; idx < 2; idx++) {
1119                 substream = pcm_oss_file->streams[idx];
1120                 if (substream == NULL)
1121                         continue;
1122                 if (asubstream == NULL)
1123                         asubstream = substream;
1124                 if (substream->runtime->oss.params) {
1125                         err = snd_pcm_oss_change_params(substream, false);
1126                         if (err < 0)
1127                                 return err;
1128                 }
1129         }
1130         if (!asubstream)
1131                 return -EIO;
1132         if (r_substream)
1133                 *r_substream = asubstream;
1134         return 0;
1135 }
1136
1137 /* call with params_lock held */
1138 /* NOTE: this always call PREPARE unconditionally no matter whether
1139  * runtime->oss.prepare is set or not
1140  */
1141 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1142 {
1143         int err;
1144         struct snd_pcm_runtime *runtime = substream->runtime;
1145
1146         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1147         if (err < 0) {
1148                 pcm_dbg(substream->pcm,
1149                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1150                 return err;
1151         }
1152         runtime->oss.prepare = 0;
1153         runtime->oss.prev_hw_ptr_period = 0;
1154         runtime->oss.period_ptr = 0;
1155         runtime->oss.buffer_used = 0;
1156
1157         return 0;
1158 }
1159
1160 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1161 {
1162         struct snd_pcm_runtime *runtime;
1163         int err;
1164
1165         runtime = substream->runtime;
1166         if (runtime->oss.params) {
1167                 err = snd_pcm_oss_change_params(substream, false);
1168                 if (err < 0)
1169                         return err;
1170         }
1171         if (runtime->oss.prepare) {
1172                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1173                         return -ERESTARTSYS;
1174                 err = snd_pcm_oss_prepare(substream);
1175                 mutex_unlock(&runtime->oss.params_lock);
1176                 if (err < 0)
1177                         return err;
1178         }
1179         return 0;
1180 }
1181
1182 /* call with params_lock held */
1183 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1184 {
1185         struct snd_pcm_runtime *runtime;
1186         int err;
1187
1188         runtime = substream->runtime;
1189         if (runtime->oss.params) {
1190                 err = snd_pcm_oss_change_params_locked(substream);
1191                 if (err < 0)
1192                         return err;
1193         }
1194         if (runtime->oss.prepare) {
1195                 err = snd_pcm_oss_prepare(substream);
1196                 if (err < 0)
1197                         return err;
1198         }
1199         return 0;
1200 }
1201
1202 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1203 {
1204         struct snd_pcm_runtime *runtime;
1205         snd_pcm_uframes_t frames;
1206         int err = 0;
1207
1208         while (1) {
1209                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1210                 if (err < 0)
1211                         break;
1212                 runtime = substream->runtime;
1213                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1214                         break;
1215                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1216                 /* until avail(delay) <= buffer_size */
1217                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1218                 frames /= runtime->period_size;
1219                 frames *= runtime->period_size;
1220                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1221                 if (err < 0)
1222                         break;
1223         }
1224         return err;
1225 }
1226
1227 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1228 {
1229         struct snd_pcm_runtime *runtime = substream->runtime;
1230         int ret;
1231         while (1) {
1232                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1233                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1234 #ifdef OSS_DEBUG
1235                         pcm_dbg(substream->pcm,
1236                                 "pcm_oss: write: recovering from %s\n",
1237                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1238                                 "XRUN" : "SUSPEND");
1239 #endif
1240                         ret = snd_pcm_oss_prepare(substream);
1241                         if (ret < 0)
1242                                 break;
1243                 }
1244                 mutex_unlock(&runtime->oss.params_lock);
1245                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1246                                          frames, in_kernel);
1247                 mutex_lock(&runtime->oss.params_lock);
1248                 if (ret != -EPIPE && ret != -ESTRPIPE)
1249                         break;
1250                 /* test, if we can't store new data, because the stream */
1251                 /* has not been started */
1252                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1253                         return -EAGAIN;
1254         }
1255         return ret;
1256 }
1257
1258 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1259 {
1260         struct snd_pcm_runtime *runtime = substream->runtime;
1261         snd_pcm_sframes_t delay;
1262         int ret;
1263         while (1) {
1264                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1265                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1266 #ifdef OSS_DEBUG
1267                         pcm_dbg(substream->pcm,
1268                                 "pcm_oss: read: recovering from %s\n",
1269                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1270                                 "XRUN" : "SUSPEND");
1271 #endif
1272                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1273                         if (ret < 0)
1274                                 break;
1275                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1276                         ret = snd_pcm_oss_prepare(substream);
1277                         if (ret < 0)
1278                                 break;
1279                 }
1280                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1281                 if (ret < 0)
1282                         break;
1283                 mutex_unlock(&runtime->oss.params_lock);
1284                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1285                                          frames, in_kernel);
1286                 mutex_lock(&runtime->oss.params_lock);
1287                 if (ret == -EPIPE) {
1288                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1289                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1290                                 if (ret < 0)
1291                                         break;
1292                         }
1293                         continue;
1294                 }
1295                 if (ret != -ESTRPIPE)
1296                         break;
1297         }
1298         return ret;
1299 }
1300
1301 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1302 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1303 {
1304         struct snd_pcm_runtime *runtime = substream->runtime;
1305         int ret;
1306         while (1) {
1307                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1308                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1309 #ifdef OSS_DEBUG
1310                         pcm_dbg(substream->pcm,
1311                                 "pcm_oss: writev: recovering from %s\n",
1312                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1313                                 "XRUN" : "SUSPEND");
1314 #endif
1315                         ret = snd_pcm_oss_prepare(substream);
1316                         if (ret < 0)
1317                                 break;
1318                 }
1319                 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1320                 if (ret != -EPIPE && ret != -ESTRPIPE)
1321                         break;
1322
1323                 /* test, if we can't store new data, because the stream */
1324                 /* has not been started */
1325                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1326                         return -EAGAIN;
1327         }
1328         return ret;
1329 }
1330
1331 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1332 {
1333         struct snd_pcm_runtime *runtime = substream->runtime;
1334         int ret;
1335         while (1) {
1336                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1337                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1338 #ifdef OSS_DEBUG
1339                         pcm_dbg(substream->pcm,
1340                                 "pcm_oss: readv: recovering from %s\n",
1341                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1342                                 "XRUN" : "SUSPEND");
1343 #endif
1344                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1345                         if (ret < 0)
1346                                 break;
1347                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1348                         ret = snd_pcm_oss_prepare(substream);
1349                         if (ret < 0)
1350                                 break;
1351                 }
1352                 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1353                 if (ret != -EPIPE && ret != -ESTRPIPE)
1354                         break;
1355         }
1356         return ret;
1357 }
1358 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1359
1360 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1361 {
1362         struct snd_pcm_runtime *runtime = substream->runtime;
1363         snd_pcm_sframes_t frames, frames1;
1364 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1365         if (runtime->oss.plugin_first) {
1366                 struct snd_pcm_plugin_channel *channels;
1367                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1368                 if (!in_kernel) {
1369                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1370                                 return -EFAULT;
1371                         buf = runtime->oss.buffer;
1372                 }
1373                 frames = bytes / oss_frame_bytes;
1374                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1375                 if (frames1 < 0)
1376                         return frames1;
1377                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1378                 if (frames1 <= 0)
1379                         return frames1;
1380                 bytes = frames1 * oss_frame_bytes;
1381         } else
1382 #endif
1383         {
1384                 frames = bytes_to_frames(runtime, bytes);
1385                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1386                 if (frames1 <= 0)
1387                         return frames1;
1388                 bytes = frames_to_bytes(runtime, frames1);
1389         }
1390         return bytes;
1391 }
1392
1393 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1394 {
1395         size_t xfer = 0;
1396         ssize_t tmp = 0;
1397         struct snd_pcm_runtime *runtime = substream->runtime;
1398
1399         if (atomic_read(&substream->mmap_count))
1400                 return -ENXIO;
1401
1402         atomic_inc(&runtime->oss.rw_ref);
1403         while (bytes > 0) {
1404                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1405                         tmp = -ERESTARTSYS;
1406                         break;
1407                 }
1408                 tmp = snd_pcm_oss_make_ready_locked(substream);
1409                 if (tmp < 0)
1410                         goto err;
1411                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1412                         tmp = bytes;
1413                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1414                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1415                         if (tmp > 0) {
1416                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1417                                         tmp = -EFAULT;
1418                                         goto err;
1419                                 }
1420                         }
1421                         runtime->oss.buffer_used += tmp;
1422                         buf += tmp;
1423                         bytes -= tmp;
1424                         xfer += tmp;
1425                         if (substream->oss.setup.partialfrag ||
1426                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1427                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1428                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1429                                 if (tmp <= 0)
1430                                         goto err;
1431                                 runtime->oss.bytes += tmp;
1432                                 runtime->oss.period_ptr += tmp;
1433                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1434                                 if (runtime->oss.period_ptr == 0 ||
1435                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1436                                         runtime->oss.buffer_used = 0;
1437                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1438                                         tmp = -EAGAIN;
1439                                         goto err;
1440                                 }
1441                         }
1442                 } else {
1443                         tmp = snd_pcm_oss_write2(substream,
1444                                                  (const char __force *)buf,
1445                                                  runtime->oss.period_bytes, 0);
1446                         if (tmp <= 0)
1447                                 goto err;
1448                         runtime->oss.bytes += tmp;
1449                         buf += tmp;
1450                         bytes -= tmp;
1451                         xfer += tmp;
1452                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1453                             tmp != runtime->oss.period_bytes)
1454                                 tmp = -EAGAIN;
1455                 }
1456  err:
1457                 mutex_unlock(&runtime->oss.params_lock);
1458                 if (tmp < 0)
1459                         break;
1460                 if (signal_pending(current)) {
1461                         tmp = -ERESTARTSYS;
1462                         break;
1463                 }
1464                 tmp = 0;
1465         }
1466         atomic_dec(&runtime->oss.rw_ref);
1467         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1468 }
1469
1470 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1471 {
1472         struct snd_pcm_runtime *runtime = substream->runtime;
1473         snd_pcm_sframes_t frames, frames1;
1474 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1475         char __user *final_dst = (char __force __user *)buf;
1476         if (runtime->oss.plugin_first) {
1477                 struct snd_pcm_plugin_channel *channels;
1478                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1479                 if (!in_kernel)
1480                         buf = runtime->oss.buffer;
1481                 frames = bytes / oss_frame_bytes;
1482                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1483                 if (frames1 < 0)
1484                         return frames1;
1485                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1486                 if (frames1 <= 0)
1487                         return frames1;
1488                 bytes = frames1 * oss_frame_bytes;
1489                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1490                         return -EFAULT;
1491         } else
1492 #endif
1493         {
1494                 frames = bytes_to_frames(runtime, bytes);
1495                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1496                 if (frames1 <= 0)
1497                         return frames1;
1498                 bytes = frames_to_bytes(runtime, frames1);
1499         }
1500         return bytes;
1501 }
1502
1503 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1504 {
1505         size_t xfer = 0;
1506         ssize_t tmp = 0;
1507         struct snd_pcm_runtime *runtime = substream->runtime;
1508
1509         if (atomic_read(&substream->mmap_count))
1510                 return -ENXIO;
1511
1512         atomic_inc(&runtime->oss.rw_ref);
1513         while (bytes > 0) {
1514                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1515                         tmp = -ERESTARTSYS;
1516                         break;
1517                 }
1518                 tmp = snd_pcm_oss_make_ready_locked(substream);
1519                 if (tmp < 0)
1520                         goto err;
1521                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1522                         if (runtime->oss.buffer_used == 0) {
1523                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1524                                 if (tmp <= 0)
1525                                         goto err;
1526                                 runtime->oss.bytes += tmp;
1527                                 runtime->oss.period_ptr = tmp;
1528                                 runtime->oss.buffer_used = tmp;
1529                         }
1530                         tmp = bytes;
1531                         if ((size_t) tmp > runtime->oss.buffer_used)
1532                                 tmp = runtime->oss.buffer_used;
1533                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1534                                 tmp = -EFAULT;
1535                                 goto err;
1536                         }
1537                         buf += tmp;
1538                         bytes -= tmp;
1539                         xfer += tmp;
1540                         runtime->oss.buffer_used -= tmp;
1541                 } else {
1542                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1543                                                 runtime->oss.period_bytes, 0);
1544                         if (tmp <= 0)
1545                                 goto err;
1546                         runtime->oss.bytes += tmp;
1547                         buf += tmp;
1548                         bytes -= tmp;
1549                         xfer += tmp;
1550                 }
1551  err:
1552                 mutex_unlock(&runtime->oss.params_lock);
1553                 if (tmp < 0)
1554                         break;
1555                 if (signal_pending(current)) {
1556                         tmp = -ERESTARTSYS;
1557                         break;
1558                 }
1559                 tmp = 0;
1560         }
1561         atomic_dec(&runtime->oss.rw_ref);
1562         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1563 }
1564
1565 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1566 {
1567         struct snd_pcm_substream *substream;
1568         struct snd_pcm_runtime *runtime;
1569         int i;
1570
1571         for (i = 0; i < 2; i++) {
1572                 substream = pcm_oss_file->streams[i];
1573                 if (!substream)
1574                         continue;
1575                 runtime = substream->runtime;
1576                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1577                 mutex_lock(&runtime->oss.params_lock);
1578                 runtime->oss.prepare = 1;
1579                 runtime->oss.buffer_used = 0;
1580                 runtime->oss.prev_hw_ptr_period = 0;
1581                 runtime->oss.period_ptr = 0;
1582                 mutex_unlock(&runtime->oss.params_lock);
1583         }
1584         return 0;
1585 }
1586
1587 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1588 {
1589         struct snd_pcm_substream *substream;
1590         int err;
1591
1592         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1593         if (substream != NULL) {
1594                 err = snd_pcm_oss_make_ready(substream);
1595                 if (err < 0)
1596                         return err;
1597                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1598         }
1599         /* note: all errors from the start action are ignored */
1600         /* OSS apps do not know, how to handle them */
1601         return 0;
1602 }
1603
1604 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1605 {
1606         struct snd_pcm_runtime *runtime;
1607         ssize_t result = 0;
1608         snd_pcm_state_t state;
1609         long res;
1610         wait_queue_entry_t wait;
1611
1612         runtime = substream->runtime;
1613         init_waitqueue_entry(&wait, current);
1614         add_wait_queue(&runtime->sleep, &wait);
1615 #ifdef OSS_DEBUG
1616         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1617 #endif
1618         while (1) {
1619                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1620                 if (result > 0) {
1621                         runtime->oss.buffer_used = 0;
1622                         result = 0;
1623                         break;
1624                 }
1625                 if (result != 0 && result != -EAGAIN)
1626                         break;
1627                 result = 0;
1628                 set_current_state(TASK_INTERRUPTIBLE);
1629                 snd_pcm_stream_lock_irq(substream);
1630                 state = runtime->status->state;
1631                 snd_pcm_stream_unlock_irq(substream);
1632                 if (state != SNDRV_PCM_STATE_RUNNING) {
1633                         set_current_state(TASK_RUNNING);
1634                         break;
1635                 }
1636                 res = schedule_timeout(10 * HZ);
1637                 if (signal_pending(current)) {
1638                         result = -ERESTARTSYS;
1639                         break;
1640                 }
1641                 if (res == 0) {
1642                         pcm_err(substream->pcm,
1643                                 "OSS sync error - DMA timeout\n");
1644                         result = -EIO;
1645                         break;
1646                 }
1647         }
1648         remove_wait_queue(&runtime->sleep, &wait);
1649         return result;
1650 }
1651
1652 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1653 {
1654         int err = 0;
1655         unsigned int saved_f_flags;
1656         struct snd_pcm_substream *substream;
1657         struct snd_pcm_runtime *runtime;
1658         snd_pcm_format_t format;
1659         unsigned long width;
1660         size_t size;
1661
1662         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1663         if (substream != NULL) {
1664                 runtime = substream->runtime;
1665                 if (atomic_read(&substream->mmap_count))
1666                         goto __direct;
1667                 atomic_inc(&runtime->oss.rw_ref);
1668                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1669                         atomic_dec(&runtime->oss.rw_ref);
1670                         return -ERESTARTSYS;
1671                 }
1672                 err = snd_pcm_oss_make_ready_locked(substream);
1673                 if (err < 0)
1674                         goto unlock;
1675                 format = snd_pcm_oss_format_from(runtime->oss.format);
1676                 width = snd_pcm_format_physical_width(format);
1677                 if (runtime->oss.buffer_used > 0) {
1678 #ifdef OSS_DEBUG
1679                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1680 #endif
1681                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1682                         snd_pcm_format_set_silence(format,
1683                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1684                                                    size);
1685                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1686                         if (err < 0)
1687                                 goto unlock;
1688                 } else if (runtime->oss.period_ptr > 0) {
1689 #ifdef OSS_DEBUG
1690                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1691 #endif
1692                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1693                         snd_pcm_format_set_silence(format,
1694                                                    runtime->oss.buffer,
1695                                                    size * 8 / width);
1696                         err = snd_pcm_oss_sync1(substream, size);
1697                         if (err < 0)
1698                                 goto unlock;
1699                 }
1700                 /*
1701                  * The ALSA's period might be a bit large than OSS one.
1702                  * Fill the remain portion of ALSA period with zeros.
1703                  */
1704                 size = runtime->control->appl_ptr % runtime->period_size;
1705                 if (size > 0) {
1706                         size = runtime->period_size - size;
1707                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1708                                 snd_pcm_lib_write(substream, NULL, size);
1709                         else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1710                                 snd_pcm_lib_writev(substream, NULL, size);
1711                 }
1712 unlock:
1713                 mutex_unlock(&runtime->oss.params_lock);
1714                 atomic_dec(&runtime->oss.rw_ref);
1715                 if (err < 0)
1716                         return err;
1717                 /*
1718                  * finish sync: drain the buffer
1719                  */
1720               __direct:
1721                 saved_f_flags = substream->f_flags;
1722                 substream->f_flags &= ~O_NONBLOCK;
1723                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1724                 substream->f_flags = saved_f_flags;
1725                 if (err < 0)
1726                         return err;
1727                 mutex_lock(&runtime->oss.params_lock);
1728                 runtime->oss.prepare = 1;
1729                 mutex_unlock(&runtime->oss.params_lock);
1730         }
1731
1732         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1733         if (substream != NULL) {
1734                 err = snd_pcm_oss_make_ready(substream);
1735                 if (err < 0)
1736                         return err;
1737                 runtime = substream->runtime;
1738                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1739                 if (err < 0)
1740                         return err;
1741                 mutex_lock(&runtime->oss.params_lock);
1742                 runtime->oss.buffer_used = 0;
1743                 runtime->oss.prepare = 1;
1744                 mutex_unlock(&runtime->oss.params_lock);
1745         }
1746         return 0;
1747 }
1748
1749 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1750 {
1751         int idx;
1752
1753         for (idx = 1; idx >= 0; --idx) {
1754                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1755                 struct snd_pcm_runtime *runtime;
1756                 int err;
1757
1758                 if (substream == NULL)
1759                         continue;
1760                 runtime = substream->runtime;
1761                 if (rate < 1000)
1762                         rate = 1000;
1763                 else if (rate > 192000)
1764                         rate = 192000;
1765                 err = lock_params(runtime);
1766                 if (err < 0)
1767                         return err;
1768                 if (runtime->oss.rate != rate) {
1769                         runtime->oss.params = 1;
1770                         runtime->oss.rate = rate;
1771                 }
1772                 unlock_params(runtime);
1773         }
1774         return snd_pcm_oss_get_rate(pcm_oss_file);
1775 }
1776
1777 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1778 {
1779         struct snd_pcm_substream *substream;
1780         int err;
1781
1782         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1783         if (err < 0)
1784                 return err;
1785         return substream->runtime->oss.rate;
1786 }
1787
1788 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1789 {
1790         int idx;
1791         if (channels < 1)
1792                 channels = 1;
1793         if (channels > 128)
1794                 return -EINVAL;
1795         for (idx = 1; idx >= 0; --idx) {
1796                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1797                 struct snd_pcm_runtime *runtime;
1798                 int err;
1799
1800                 if (substream == NULL)
1801                         continue;
1802                 runtime = substream->runtime;
1803                 err = lock_params(runtime);
1804                 if (err < 0)
1805                         return err;
1806                 if (runtime->oss.channels != channels) {
1807                         runtime->oss.params = 1;
1808                         runtime->oss.channels = channels;
1809                 }
1810                 unlock_params(runtime);
1811         }
1812         return snd_pcm_oss_get_channels(pcm_oss_file);
1813 }
1814
1815 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1816 {
1817         struct snd_pcm_substream *substream;
1818         int err;
1819
1820         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1821         if (err < 0)
1822                 return err;
1823         return substream->runtime->oss.channels;
1824 }
1825
1826 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1827 {
1828         struct snd_pcm_substream *substream;
1829         int err;
1830
1831         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1832         if (err < 0)
1833                 return err;
1834         return substream->runtime->oss.period_bytes;
1835 }
1836
1837 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1838 {
1839         struct snd_pcm_substream *substream;
1840         int err;
1841         int direct;
1842         struct snd_pcm_hw_params *params;
1843         unsigned int formats = 0;
1844         const struct snd_mask *format_mask;
1845         int fmt;
1846
1847         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1848         if (err < 0)
1849                 return err;
1850         if (atomic_read(&substream->mmap_count))
1851                 direct = 1;
1852         else
1853                 direct = substream->oss.setup.direct;
1854         if (!direct)
1855                 return AFMT_MU_LAW | AFMT_U8 |
1856                        AFMT_S16_LE | AFMT_S16_BE |
1857                        AFMT_S8 | AFMT_U16_LE |
1858                        AFMT_U16_BE |
1859                         AFMT_S32_LE | AFMT_S32_BE |
1860                         AFMT_S24_LE | AFMT_S24_BE |
1861                         AFMT_S24_PACKED;
1862         params = kmalloc(sizeof(*params), GFP_KERNEL);
1863         if (!params)
1864                 return -ENOMEM;
1865         _snd_pcm_hw_params_any(params);
1866         err = snd_pcm_hw_refine(substream, params);
1867         if (err < 0)
1868                 goto error;
1869         format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1870         for (fmt = 0; fmt < 32; ++fmt) {
1871                 if (snd_mask_test(format_mask, fmt)) {
1872                         int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1873                         if (f >= 0)
1874                                 formats |= f;
1875                 }
1876         }
1877
1878  error:
1879         kfree(params);
1880         return err < 0 ? err : formats;
1881 }
1882
1883 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1884 {
1885         int formats, idx;
1886         int err;
1887
1888         if (format != AFMT_QUERY) {
1889                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1890                 if (formats < 0)
1891                         return formats;
1892                 if (!(formats & format))
1893                         format = AFMT_U8;
1894                 for (idx = 1; idx >= 0; --idx) {
1895                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1896                         struct snd_pcm_runtime *runtime;
1897                         if (substream == NULL)
1898                                 continue;
1899                         runtime = substream->runtime;
1900                         err = lock_params(runtime);
1901                         if (err < 0)
1902                                 return err;
1903                         if (runtime->oss.format != format) {
1904                                 runtime->oss.params = 1;
1905                                 runtime->oss.format = format;
1906                         }
1907                         unlock_params(runtime);
1908                 }
1909         }
1910         return snd_pcm_oss_get_format(pcm_oss_file);
1911 }
1912
1913 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1914 {
1915         struct snd_pcm_substream *substream;
1916         int err;
1917
1918         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1919         if (err < 0)
1920                 return err;
1921         return substream->runtime->oss.format;
1922 }
1923
1924 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1925 {
1926         struct snd_pcm_runtime *runtime;
1927
1928         runtime = substream->runtime;
1929         if (subdivide == 0) {
1930                 subdivide = runtime->oss.subdivision;
1931                 if (subdivide == 0)
1932                         subdivide = 1;
1933                 return subdivide;
1934         }
1935         if (runtime->oss.subdivision || runtime->oss.fragshift)
1936                 return -EINVAL;
1937         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1938             subdivide != 8 && subdivide != 16)
1939                 return -EINVAL;
1940         runtime->oss.subdivision = subdivide;
1941         runtime->oss.params = 1;
1942         return subdivide;
1943 }
1944
1945 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1946 {
1947         int err = -EINVAL, idx;
1948
1949         for (idx = 1; idx >= 0; --idx) {
1950                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1951                 struct snd_pcm_runtime *runtime;
1952
1953                 if (substream == NULL)
1954                         continue;
1955                 runtime = substream->runtime;
1956                 err = lock_params(runtime);
1957                 if (err < 0)
1958                         return err;
1959                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1960                 unlock_params(runtime);
1961                 if (err < 0)
1962                         return err;
1963         }
1964         return err;
1965 }
1966
1967 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1968 {
1969         struct snd_pcm_runtime *runtime;
1970         int fragshift;
1971
1972         runtime = substream->runtime;
1973         if (runtime->oss.subdivision || runtime->oss.fragshift)
1974                 return -EINVAL;
1975         fragshift = val & 0xffff;
1976         if (fragshift >= 25) /* should be large enough */
1977                 return -EINVAL;
1978         runtime->oss.fragshift = fragshift;
1979         runtime->oss.maxfrags = (val >> 16) & 0xffff;
1980         if (runtime->oss.fragshift < 4)         /* < 16 */
1981                 runtime->oss.fragshift = 4;
1982         if (runtime->oss.maxfrags < 2)
1983                 runtime->oss.maxfrags = 2;
1984         runtime->oss.params = 1;
1985         return 0;
1986 }
1987
1988 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1989 {
1990         int err = -EINVAL, idx;
1991
1992         for (idx = 1; idx >= 0; --idx) {
1993                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1994                 struct snd_pcm_runtime *runtime;
1995
1996                 if (substream == NULL)
1997                         continue;
1998                 runtime = substream->runtime;
1999                 err = lock_params(runtime);
2000                 if (err < 0)
2001                         return err;
2002                 err = snd_pcm_oss_set_fragment1(substream, val);
2003                 unlock_params(runtime);
2004                 if (err < 0)
2005                         return err;
2006         }
2007         return err;
2008 }
2009
2010 static int snd_pcm_oss_nonblock(struct file * file)
2011 {
2012         spin_lock(&file->f_lock);
2013         file->f_flags |= O_NONBLOCK;
2014         spin_unlock(&file->f_lock);
2015         return 0;
2016 }
2017
2018 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2019 {
2020
2021         if (substream == NULL) {
2022                 res &= ~DSP_CAP_DUPLEX;
2023                 return res;
2024         }
2025 #ifdef DSP_CAP_MULTI
2026         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2027                 if (substream->pstr->substream_count > 1)
2028                         res |= DSP_CAP_MULTI;
2029 #endif
2030         /* DSP_CAP_REALTIME is set all times: */
2031         /* all ALSA drivers can return actual pointer in ring buffer */
2032 #if defined(DSP_CAP_REALTIME) && 0
2033         {
2034                 struct snd_pcm_runtime *runtime = substream->runtime;
2035                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2036                         res &= ~DSP_CAP_REALTIME;
2037         }
2038 #endif
2039         return res;
2040 }
2041
2042 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2043 {
2044         int result, idx;
2045
2046         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2047         for (idx = 0; idx < 2; idx++) {
2048                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2049                 result = snd_pcm_oss_get_caps1(substream, result);
2050         }
2051         result |= 0x0001;       /* revision - same as SB AWE 64 */
2052         return result;
2053 }
2054
2055 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2056                                       snd_pcm_uframes_t hw_ptr)
2057 {
2058         struct snd_pcm_runtime *runtime = substream->runtime;
2059         snd_pcm_uframes_t appl_ptr;
2060         appl_ptr = hw_ptr + runtime->buffer_size;
2061         appl_ptr %= runtime->boundary;
2062         runtime->control->appl_ptr = appl_ptr;
2063 }
2064
2065 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2066 {
2067         struct snd_pcm_runtime *runtime;
2068         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2069         int err, cmd;
2070
2071 #ifdef OSS_DEBUG
2072         pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2073 #endif
2074
2075         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2076         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2077
2078         if (psubstream) {
2079                 err = snd_pcm_oss_make_ready(psubstream);
2080                 if (err < 0)
2081                         return err;
2082         }
2083         if (csubstream) {
2084                 err = snd_pcm_oss_make_ready(csubstream);
2085                 if (err < 0)
2086                         return err;
2087         }
2088         if (psubstream) {
2089                 runtime = psubstream->runtime;
2090                 cmd = 0;
2091                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2092                         return -ERESTARTSYS;
2093                 if (trigger & PCM_ENABLE_OUTPUT) {
2094                         if (runtime->oss.trigger)
2095                                 goto _skip1;
2096                         if (atomic_read(&psubstream->mmap_count))
2097                                 snd_pcm_oss_simulate_fill(psubstream,
2098                                                 get_hw_ptr_period(runtime));
2099                         runtime->oss.trigger = 1;
2100                         runtime->start_threshold = 1;
2101                         cmd = SNDRV_PCM_IOCTL_START;
2102                 } else {
2103                         if (!runtime->oss.trigger)
2104                                 goto _skip1;
2105                         runtime->oss.trigger = 0;
2106                         runtime->start_threshold = runtime->boundary;
2107                         cmd = SNDRV_PCM_IOCTL_DROP;
2108                         runtime->oss.prepare = 1;
2109                 }
2110  _skip1:
2111                 mutex_unlock(&runtime->oss.params_lock);
2112                 if (cmd) {
2113                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2114                         if (err < 0)
2115                                 return err;
2116                 }
2117         }
2118         if (csubstream) {
2119                 runtime = csubstream->runtime;
2120                 cmd = 0;
2121                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2122                         return -ERESTARTSYS;
2123                 if (trigger & PCM_ENABLE_INPUT) {
2124                         if (runtime->oss.trigger)
2125                                 goto _skip2;
2126                         runtime->oss.trigger = 1;
2127                         runtime->start_threshold = 1;
2128                         cmd = SNDRV_PCM_IOCTL_START;
2129                 } else {
2130                         if (!runtime->oss.trigger)
2131                                 goto _skip2;
2132                         runtime->oss.trigger = 0;
2133                         runtime->start_threshold = runtime->boundary;
2134                         cmd = SNDRV_PCM_IOCTL_DROP;
2135                         runtime->oss.prepare = 1;
2136                 }
2137  _skip2:
2138                 mutex_unlock(&runtime->oss.params_lock);
2139                 if (cmd) {
2140                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2141                         if (err < 0)
2142                                 return err;
2143                 }
2144         }
2145         return 0;
2146 }
2147
2148 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2149 {
2150         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2151         int result = 0;
2152
2153         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2154         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2155         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2156                 result |= PCM_ENABLE_OUTPUT;
2157         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2158                 result |= PCM_ENABLE_INPUT;
2159         return result;
2160 }
2161
2162 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2163 {
2164         struct snd_pcm_substream *substream;
2165         struct snd_pcm_runtime *runtime;
2166         snd_pcm_sframes_t delay;
2167         int err;
2168
2169         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2170         if (substream == NULL)
2171                 return -EINVAL;
2172         err = snd_pcm_oss_make_ready(substream);
2173         if (err < 0)
2174                 return err;
2175         runtime = substream->runtime;
2176         if (runtime->oss.params || runtime->oss.prepare)
2177                 return 0;
2178         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2179         if (err == -EPIPE)
2180                 delay = 0;      /* hack for broken OSS applications */
2181         else if (err < 0)
2182                 return err;
2183         return snd_pcm_oss_bytes(substream, delay);
2184 }
2185
2186 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2187 {
2188         struct snd_pcm_substream *substream;
2189         struct snd_pcm_runtime *runtime;
2190         snd_pcm_sframes_t delay;
2191         int fixup;
2192         struct count_info info;
2193         int err;
2194
2195         if (_info == NULL)
2196                 return -EFAULT;
2197         substream = pcm_oss_file->streams[stream];
2198         if (substream == NULL)
2199                 return -EINVAL;
2200         err = snd_pcm_oss_make_ready(substream);
2201         if (err < 0)
2202                 return err;
2203         runtime = substream->runtime;
2204         if (runtime->oss.params || runtime->oss.prepare) {
2205                 memset(&info, 0, sizeof(info));
2206                 if (copy_to_user(_info, &info, sizeof(info)))
2207                         return -EFAULT;
2208                 return 0;
2209         }
2210         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2211                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2212                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2213                         err = 0;
2214                         delay = 0;
2215                         fixup = 0;
2216                 } else {
2217                         fixup = runtime->oss.buffer_used;
2218                 }
2219         } else {
2220                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2221                 fixup = -runtime->oss.buffer_used;
2222         }
2223         if (err < 0)
2224                 return err;
2225         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2226         if (atomic_read(&substream->mmap_count)) {
2227                 snd_pcm_sframes_t n;
2228                 delay = get_hw_ptr_period(runtime);
2229                 n = delay - runtime->oss.prev_hw_ptr_period;
2230                 if (n < 0)
2231                         n += runtime->boundary;
2232                 info.blocks = n / runtime->period_size;
2233                 runtime->oss.prev_hw_ptr_period = delay;
2234                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2235                         snd_pcm_oss_simulate_fill(substream, delay);
2236                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2237         } else {
2238                 delay = snd_pcm_oss_bytes(substream, delay);
2239                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2240                         if (substream->oss.setup.buggyptr)
2241                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2242                         else
2243                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2244                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2245                 } else {
2246                         delay += fixup;
2247                         info.blocks = delay / runtime->oss.period_bytes;
2248                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2249                 }
2250         }
2251         if (copy_to_user(_info, &info, sizeof(info)))
2252                 return -EFAULT;
2253         return 0;
2254 }
2255
2256 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2257 {
2258         struct snd_pcm_substream *substream;
2259         struct snd_pcm_runtime *runtime;
2260         snd_pcm_sframes_t avail;
2261         int fixup;
2262         struct audio_buf_info info;
2263         int err;
2264
2265         if (_info == NULL)
2266                 return -EFAULT;
2267         substream = pcm_oss_file->streams[stream];
2268         if (substream == NULL)
2269                 return -EINVAL;
2270         runtime = substream->runtime;
2271
2272         if (runtime->oss.params) {
2273                 err = snd_pcm_oss_change_params(substream, false);
2274                 if (err < 0)
2275                         return err;
2276         }
2277
2278         info.fragsize = runtime->oss.period_bytes;
2279         info.fragstotal = runtime->periods;
2280         if (runtime->oss.prepare) {
2281                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2282                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2283                         info.fragments = runtime->oss.periods;
2284                 } else {
2285                         info.bytes = 0;
2286                         info.fragments = 0;
2287                 }
2288         } else {
2289                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2290                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2291                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2292                                 avail = runtime->buffer_size;
2293                                 err = 0;
2294                                 fixup = 0;
2295                         } else {
2296                                 avail = runtime->buffer_size - avail;
2297                                 fixup = -runtime->oss.buffer_used;
2298                         }
2299                 } else {
2300                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2301                         fixup = runtime->oss.buffer_used;
2302                 }
2303                 if (err < 0)
2304                         return err;
2305                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2306                 info.fragments = info.bytes / runtime->oss.period_bytes;
2307         }
2308
2309 #ifdef OSS_DEBUG
2310         pcm_dbg(substream->pcm,
2311                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2312                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2313 #endif
2314         if (copy_to_user(_info, &info, sizeof(info)))
2315                 return -EFAULT;
2316         return 0;
2317 }
2318
2319 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2320 {
2321         // it won't be probably implemented
2322         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2323         return -EINVAL;
2324 }
2325
2326 static const char *strip_task_path(const char *path)
2327 {
2328         const char *ptr, *ptrl = NULL;
2329         for (ptr = path; *ptr; ptr++) {
2330                 if (*ptr == '/')
2331                         ptrl = ptr + 1;
2332         }
2333         return ptrl;
2334 }
2335
2336 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2337                                       const char *task_name,
2338                                       struct snd_pcm_oss_setup *rsetup)
2339 {
2340         struct snd_pcm_oss_setup *setup;
2341
2342         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2343         do {
2344                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2345                      setup = setup->next) {
2346                         if (!strcmp(setup->task_name, task_name))
2347                                 goto out;
2348                 }
2349         } while ((task_name = strip_task_path(task_name)) != NULL);
2350  out:
2351         if (setup)
2352                 *rsetup = *setup;
2353         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2354 }
2355
2356 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2357 {
2358         struct snd_pcm_runtime *runtime;
2359         runtime = substream->runtime;
2360         kvfree(runtime->oss.buffer);
2361         runtime->oss.buffer = NULL;
2362 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2363         snd_pcm_oss_plugin_clear(substream);
2364 #endif
2365         substream->oss.oss = 0;
2366 }
2367
2368 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2369                                        struct snd_pcm_oss_setup *setup,
2370                                        int minor)
2371 {
2372         struct snd_pcm_runtime *runtime;
2373
2374         substream->oss.oss = 1;
2375         substream->oss.setup = *setup;
2376         if (setup->nonblock)
2377                 substream->f_flags |= O_NONBLOCK;
2378         else if (setup->block)
2379                 substream->f_flags &= ~O_NONBLOCK;
2380         runtime = substream->runtime;
2381         runtime->oss.params = 1;
2382         runtime->oss.trigger = 1;
2383         runtime->oss.rate = 8000;
2384         mutex_init(&runtime->oss.params_lock);
2385         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2386         case SNDRV_MINOR_OSS_PCM_8:
2387                 runtime->oss.format = AFMT_U8;
2388                 break;
2389         case SNDRV_MINOR_OSS_PCM_16:
2390                 runtime->oss.format = AFMT_S16_LE;
2391                 break;
2392         default:
2393                 runtime->oss.format = AFMT_MU_LAW;
2394         }
2395         runtime->oss.channels = 1;
2396         runtime->oss.fragshift = 0;
2397         runtime->oss.maxfrags = 0;
2398         runtime->oss.subdivision = 0;
2399         substream->pcm_release = snd_pcm_oss_release_substream;
2400         atomic_set(&runtime->oss.rw_ref, 0);
2401 }
2402
2403 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2404 {
2405         int cidx;
2406         if (!pcm_oss_file)
2407                 return 0;
2408         for (cidx = 0; cidx < 2; ++cidx) {
2409                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2410                 if (substream)
2411                         snd_pcm_release_substream(substream);
2412         }
2413         kfree(pcm_oss_file);
2414         return 0;
2415 }
2416
2417 static int snd_pcm_oss_open_file(struct file *file,
2418                                  struct snd_pcm *pcm,
2419                                  struct snd_pcm_oss_file **rpcm_oss_file,
2420                                  int minor,
2421                                  struct snd_pcm_oss_setup *setup)
2422 {
2423         int idx, err;
2424         struct snd_pcm_oss_file *pcm_oss_file;
2425         struct snd_pcm_substream *substream;
2426         fmode_t f_mode = file->f_mode;
2427
2428         if (rpcm_oss_file)
2429                 *rpcm_oss_file = NULL;
2430
2431         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2432         if (pcm_oss_file == NULL)
2433                 return -ENOMEM;
2434
2435         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2436             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2437                 f_mode = FMODE_WRITE;
2438
2439         file->f_flags &= ~O_APPEND;
2440         for (idx = 0; idx < 2; idx++) {
2441                 if (setup[idx].disable)
2442                         continue;
2443                 if (! pcm->streams[idx].substream_count)
2444                         continue; /* no matching substream */
2445                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2446                         if (! (f_mode & FMODE_WRITE))
2447                                 continue;
2448                 } else {
2449                         if (! (f_mode & FMODE_READ))
2450                                 continue;
2451                 }
2452                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2453                 if (err < 0) {
2454                         snd_pcm_oss_release_file(pcm_oss_file);
2455                         return err;
2456                 }
2457
2458                 pcm_oss_file->streams[idx] = substream;
2459                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2460         }
2461
2462         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2463                 snd_pcm_oss_release_file(pcm_oss_file);
2464                 return -EINVAL;
2465         }
2466
2467         file->private_data = pcm_oss_file;
2468         if (rpcm_oss_file)
2469                 *rpcm_oss_file = pcm_oss_file;
2470         return 0;
2471 }
2472
2473
2474 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2475 {
2476         unsigned int idx;
2477
2478         if (snd_BUG_ON(!task || !name || size < 2))
2479                 return -EINVAL;
2480         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2481                 name[idx] = task->comm[idx];
2482         name[idx] = '\0';
2483         return 0;
2484 }
2485
2486 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2487 {
2488         int err;
2489         char task_name[32];
2490         struct snd_pcm *pcm;
2491         struct snd_pcm_oss_file *pcm_oss_file;
2492         struct snd_pcm_oss_setup setup[2];
2493         int nonblock;
2494         wait_queue_entry_t wait;
2495
2496         err = nonseekable_open(inode, file);
2497         if (err < 0)
2498                 return err;
2499
2500         pcm = snd_lookup_oss_minor_data(iminor(inode),
2501                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2502         if (pcm == NULL) {
2503                 err = -ENODEV;
2504                 goto __error1;
2505         }
2506         err = snd_card_file_add(pcm->card, file);
2507         if (err < 0)
2508                 goto __error1;
2509         if (!try_module_get(pcm->card->module)) {
2510                 err = -EFAULT;
2511                 goto __error2;
2512         }
2513         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2514                 err = -EFAULT;
2515                 goto __error;
2516         }
2517         memset(setup, 0, sizeof(setup));
2518         if (file->f_mode & FMODE_WRITE)
2519                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2520                                            task_name, &setup[0]);
2521         if (file->f_mode & FMODE_READ)
2522                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2523                                            task_name, &setup[1]);
2524
2525         nonblock = !!(file->f_flags & O_NONBLOCK);
2526         if (!nonblock)
2527                 nonblock = nonblock_open;
2528
2529         init_waitqueue_entry(&wait, current);
2530         add_wait_queue(&pcm->open_wait, &wait);
2531         mutex_lock(&pcm->open_mutex);
2532         while (1) {
2533                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2534                                             iminor(inode), setup);
2535                 if (err >= 0)
2536                         break;
2537                 if (err == -EAGAIN) {
2538                         if (nonblock) {
2539                                 err = -EBUSY;
2540                                 break;
2541                         }
2542                 } else
2543                         break;
2544                 set_current_state(TASK_INTERRUPTIBLE);
2545                 mutex_unlock(&pcm->open_mutex);
2546                 schedule();
2547                 mutex_lock(&pcm->open_mutex);
2548                 if (pcm->card->shutdown) {
2549                         err = -ENODEV;
2550                         break;
2551                 }
2552                 if (signal_pending(current)) {
2553                         err = -ERESTARTSYS;
2554                         break;
2555                 }
2556         }
2557         remove_wait_queue(&pcm->open_wait, &wait);
2558         mutex_unlock(&pcm->open_mutex);
2559         if (err < 0)
2560                 goto __error;
2561         snd_card_unref(pcm->card);
2562         return err;
2563
2564       __error:
2565         module_put(pcm->card->module);
2566       __error2:
2567         snd_card_file_remove(pcm->card, file);
2568       __error1:
2569         if (pcm)
2570                 snd_card_unref(pcm->card);
2571         return err;
2572 }
2573
2574 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2575 {
2576         struct snd_pcm *pcm;
2577         struct snd_pcm_substream *substream;
2578         struct snd_pcm_oss_file *pcm_oss_file;
2579
2580         pcm_oss_file = file->private_data;
2581         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2582         if (substream == NULL)
2583                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2584         if (snd_BUG_ON(!substream))
2585                 return -ENXIO;
2586         pcm = substream->pcm;
2587         if (!pcm->card->shutdown)
2588                 snd_pcm_oss_sync(pcm_oss_file);
2589         mutex_lock(&pcm->open_mutex);
2590         snd_pcm_oss_release_file(pcm_oss_file);
2591         mutex_unlock(&pcm->open_mutex);
2592         wake_up(&pcm->open_wait);
2593         module_put(pcm->card->module);
2594         snd_card_file_remove(pcm->card, file);
2595         return 0;
2596 }
2597
2598 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2599 {
2600         struct snd_pcm_oss_file *pcm_oss_file;
2601         int __user *p = (int __user *)arg;
2602         int res;
2603
2604         pcm_oss_file = file->private_data;
2605         if (cmd == OSS_GETVERSION)
2606                 return put_user(SNDRV_OSS_VERSION, p);
2607         if (cmd == OSS_ALSAEMULVER)
2608                 return put_user(1, p);
2609 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2610         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2611                 struct snd_pcm_substream *substream;
2612                 int idx;
2613                 for (idx = 0; idx < 2; ++idx) {
2614                         substream = pcm_oss_file->streams[idx];
2615                         if (substream != NULL)
2616                                 break;
2617                 }
2618                 if (snd_BUG_ON(idx >= 2))
2619                         return -ENXIO;
2620                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2621         }
2622 #endif
2623         if (((cmd >> 8) & 0xff) != 'P')
2624                 return -EINVAL;
2625 #ifdef OSS_DEBUG
2626         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2627 #endif
2628         switch (cmd) {
2629         case SNDCTL_DSP_RESET:
2630                 return snd_pcm_oss_reset(pcm_oss_file);
2631         case SNDCTL_DSP_SYNC:
2632                 return snd_pcm_oss_sync(pcm_oss_file);
2633         case SNDCTL_DSP_SPEED:
2634                 if (get_user(res, p))
2635                         return -EFAULT;
2636                 res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2637                 if (res < 0)
2638                         return res;
2639                 return put_user(res, p);
2640         case SOUND_PCM_READ_RATE:
2641                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2642                 if (res < 0)
2643                         return res;
2644                 return put_user(res, p);
2645         case SNDCTL_DSP_STEREO:
2646                 if (get_user(res, p))
2647                         return -EFAULT;
2648                 res = res > 0 ? 2 : 1;
2649                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2650                 if (res < 0)
2651                         return res;
2652                 return put_user(--res, p);
2653         case SNDCTL_DSP_GETBLKSIZE:
2654                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2655                 if (res < 0)
2656                         return res;
2657                 return put_user(res, p);
2658         case SNDCTL_DSP_SETFMT:
2659                 if (get_user(res, p))
2660                         return -EFAULT;
2661                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2662                 if (res < 0)
2663                         return res;
2664                 return put_user(res, p);
2665         case SOUND_PCM_READ_BITS:
2666                 res = snd_pcm_oss_get_format(pcm_oss_file);
2667                 if (res < 0)
2668                         return res;
2669                 return put_user(res, p);
2670         case SNDCTL_DSP_CHANNELS:
2671                 if (get_user(res, p))
2672                         return -EFAULT;
2673                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2674                 if (res < 0)
2675                         return res;
2676                 return put_user(res, p);
2677         case SOUND_PCM_READ_CHANNELS:
2678                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2679                 if (res < 0)
2680                         return res;
2681                 return put_user(res, p);
2682         case SOUND_PCM_WRITE_FILTER:
2683         case SOUND_PCM_READ_FILTER:
2684                 return -EIO;
2685         case SNDCTL_DSP_POST:
2686                 return snd_pcm_oss_post(pcm_oss_file);
2687         case SNDCTL_DSP_SUBDIVIDE:
2688                 if (get_user(res, p))
2689                         return -EFAULT;
2690                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2691                 if (res < 0)
2692                         return res;
2693                 return put_user(res, p);
2694         case SNDCTL_DSP_SETFRAGMENT:
2695                 if (get_user(res, p))
2696                         return -EFAULT;
2697                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2698         case SNDCTL_DSP_GETFMTS:
2699                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2700                 if (res < 0)
2701                         return res;
2702                 return put_user(res, p);
2703         case SNDCTL_DSP_GETOSPACE:
2704         case SNDCTL_DSP_GETISPACE:
2705                 return snd_pcm_oss_get_space(pcm_oss_file,
2706                         cmd == SNDCTL_DSP_GETISPACE ?
2707                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2708                         (struct audio_buf_info __user *) arg);
2709         case SNDCTL_DSP_NONBLOCK:
2710                 return snd_pcm_oss_nonblock(file);
2711         case SNDCTL_DSP_GETCAPS:
2712                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2713                 if (res < 0)
2714                         return res;
2715                 return put_user(res, p);
2716         case SNDCTL_DSP_GETTRIGGER:
2717                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2718                 if (res < 0)
2719                         return res;
2720                 return put_user(res, p);
2721         case SNDCTL_DSP_SETTRIGGER:
2722                 if (get_user(res, p))
2723                         return -EFAULT;
2724                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2725         case SNDCTL_DSP_GETIPTR:
2726         case SNDCTL_DSP_GETOPTR:
2727                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2728                         cmd == SNDCTL_DSP_GETIPTR ?
2729                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2730                         (struct count_info __user *) arg);
2731         case SNDCTL_DSP_MAPINBUF:
2732         case SNDCTL_DSP_MAPOUTBUF:
2733                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2734                         cmd == SNDCTL_DSP_MAPINBUF ?
2735                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2736                         (struct buffmem_desc __user *) arg);
2737         case SNDCTL_DSP_SETSYNCRO:
2738                 /* stop DMA now.. */
2739                 return 0;
2740         case SNDCTL_DSP_SETDUPLEX:
2741                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2742                         return 0;
2743                 return -EIO;
2744         case SNDCTL_DSP_GETODELAY:
2745                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2746                 if (res < 0) {
2747                         /* it's for sure, some broken apps don't check for error codes */
2748                         put_user(0, p);
2749                         return res;
2750                 }
2751                 return put_user(res, p);
2752         case SNDCTL_DSP_PROFILE:
2753                 return 0;       /* silently ignore */
2754         default:
2755                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2756         }
2757         return -EINVAL;
2758 }
2759
2760 #ifdef CONFIG_COMPAT
2761 /* all compatible */
2762 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2763                                      unsigned long arg)
2764 {
2765         /*
2766          * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2767          * which are not implemented for the native case either
2768          */
2769         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2770 }
2771 #else
2772 #define snd_pcm_oss_ioctl_compat        NULL
2773 #endif
2774
2775 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2776 {
2777         struct snd_pcm_oss_file *pcm_oss_file;
2778         struct snd_pcm_substream *substream;
2779
2780         pcm_oss_file = file->private_data;
2781         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2782         if (substream == NULL)
2783                 return -ENXIO;
2784         substream->f_flags = file->f_flags & O_NONBLOCK;
2785 #ifndef OSS_DEBUG
2786         return snd_pcm_oss_read1(substream, buf, count);
2787 #else
2788         {
2789                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2790                 pcm_dbg(substream->pcm,
2791                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2792                         (long)count, (long)res);
2793                 return res;
2794         }
2795 #endif
2796 }
2797
2798 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2799 {
2800         struct snd_pcm_oss_file *pcm_oss_file;
2801         struct snd_pcm_substream *substream;
2802         long result;
2803
2804         pcm_oss_file = file->private_data;
2805         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2806         if (substream == NULL)
2807                 return -ENXIO;
2808         substream->f_flags = file->f_flags & O_NONBLOCK;
2809         result = snd_pcm_oss_write1(substream, buf, count);
2810 #ifdef OSS_DEBUG
2811         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2812                (long)count, (long)result);
2813 #endif
2814         return result;
2815 }
2816
2817 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2818 {
2819         struct snd_pcm_runtime *runtime = substream->runtime;
2820         if (atomic_read(&substream->mmap_count))
2821                 return runtime->oss.prev_hw_ptr_period !=
2822                                                 get_hw_ptr_period(runtime);
2823         else
2824                 return snd_pcm_playback_avail(runtime) >=
2825                                                 runtime->oss.period_frames;
2826 }
2827
2828 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2829 {
2830         struct snd_pcm_runtime *runtime = substream->runtime;
2831         if (atomic_read(&substream->mmap_count))
2832                 return runtime->oss.prev_hw_ptr_period !=
2833                                                 get_hw_ptr_period(runtime);
2834         else
2835                 return snd_pcm_capture_avail(runtime) >=
2836                                                 runtime->oss.period_frames;
2837 }
2838
2839 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2840 {
2841         struct snd_pcm_oss_file *pcm_oss_file;
2842         __poll_t mask;
2843         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2844
2845         pcm_oss_file = file->private_data;
2846
2847         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2848         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2849
2850         mask = 0;
2851         if (psubstream != NULL) {
2852                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2853                 poll_wait(file, &runtime->sleep, wait);
2854                 snd_pcm_stream_lock_irq(psubstream);
2855                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2856                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2857                      snd_pcm_oss_playback_ready(psubstream)))
2858                         mask |= EPOLLOUT | EPOLLWRNORM;
2859                 snd_pcm_stream_unlock_irq(psubstream);
2860         }
2861         if (csubstream != NULL) {
2862                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2863                 snd_pcm_state_t ostate;
2864                 poll_wait(file, &runtime->sleep, wait);
2865                 snd_pcm_stream_lock_irq(csubstream);
2866                 ostate = runtime->status->state;
2867                 if (ostate != SNDRV_PCM_STATE_RUNNING ||
2868                     snd_pcm_oss_capture_ready(csubstream))
2869                         mask |= EPOLLIN | EPOLLRDNORM;
2870                 snd_pcm_stream_unlock_irq(csubstream);
2871                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2872                         struct snd_pcm_oss_file ofile;
2873                         memset(&ofile, 0, sizeof(ofile));
2874                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2875                         runtime->oss.trigger = 0;
2876                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2877                 }
2878         }
2879
2880         return mask;
2881 }
2882
2883 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2884 {
2885         struct snd_pcm_oss_file *pcm_oss_file;
2886         struct snd_pcm_substream *substream = NULL;
2887         struct snd_pcm_runtime *runtime;
2888         int err;
2889
2890 #ifdef OSS_DEBUG
2891         pr_debug("pcm_oss: mmap begin\n");
2892 #endif
2893         pcm_oss_file = file->private_data;
2894         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2895         case VM_READ | VM_WRITE:
2896                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2897                 if (substream)
2898                         break;
2899                 fallthrough;
2900         case VM_READ:
2901                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2902                 break;
2903         case VM_WRITE:
2904                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2905                 break;
2906         default:
2907                 return -EINVAL;
2908         }
2909         /* set VM_READ access as well to fix memset() routines that do
2910            reads before writes (to improve performance) */
2911         area->vm_flags |= VM_READ;
2912         if (substream == NULL)
2913                 return -ENXIO;
2914         runtime = substream->runtime;
2915         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2916                 return -EIO;
2917         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2918                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2919         else
2920                 return -EIO;
2921
2922         if (runtime->oss.params) {
2923                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2924                  * between mmap_lock and params_lock taken by
2925                  * copy_from/to_user() in snd_pcm_oss_write/read()
2926                  */
2927                 err = snd_pcm_oss_change_params(substream, true);
2928                 if (err < 0)
2929                         return err;
2930         }
2931 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2932         if (runtime->oss.plugin_first != NULL)
2933                 return -EIO;
2934 #endif
2935
2936         if (area->vm_pgoff != 0)
2937                 return -EINVAL;
2938
2939         err = snd_pcm_mmap_data(substream, file, area);
2940         if (err < 0)
2941                 return err;
2942         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2943         runtime->silence_threshold = 0;
2944         runtime->silence_size = 0;
2945 #ifdef OSS_DEBUG
2946         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2947                runtime->oss.mmap_bytes);
2948 #endif
2949         /* In mmap mode we never stop */
2950         runtime->stop_threshold = runtime->boundary;
2951
2952         return 0;
2953 }
2954
2955 #ifdef CONFIG_SND_VERBOSE_PROCFS
2956 /*
2957  *  /proc interface
2958  */
2959
2960 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2961                                   struct snd_info_buffer *buffer)
2962 {
2963         struct snd_pcm_str *pstr = entry->private_data;
2964         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2965         mutex_lock(&pstr->oss.setup_mutex);
2966         while (setup) {
2967                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2968                             setup->task_name,
2969                             setup->periods,
2970                             setup->period_size,
2971                             setup->disable ? " disable" : "",
2972                             setup->direct ? " direct" : "",
2973                             setup->block ? " block" : "",
2974                             setup->nonblock ? " non-block" : "",
2975                             setup->partialfrag ? " partial-frag" : "",
2976                             setup->nosilence ? " no-silence" : "");
2977                 setup = setup->next;
2978         }
2979         mutex_unlock(&pstr->oss.setup_mutex);
2980 }
2981
2982 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2983 {
2984         struct snd_pcm_oss_setup *setup, *setupn;
2985
2986         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2987              setup; setup = setupn) {
2988                 setupn = setup->next;
2989                 kfree(setup->task_name);
2990                 kfree(setup);
2991         }
2992         pstr->oss.setup_list = NULL;
2993 }
2994
2995 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2996                                    struct snd_info_buffer *buffer)
2997 {
2998         struct snd_pcm_str *pstr = entry->private_data;
2999         char line[128], str[32], task_name[32];
3000         const char *ptr;
3001         int idx1;
3002         struct snd_pcm_oss_setup *setup, *setup1, template;
3003
3004         while (!snd_info_get_line(buffer, line, sizeof(line))) {
3005                 mutex_lock(&pstr->oss.setup_mutex);
3006                 memset(&template, 0, sizeof(template));
3007                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3008                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3009                         snd_pcm_oss_proc_free_setup_list(pstr);
3010                         mutex_unlock(&pstr->oss.setup_mutex);
3011                         continue;
3012                 }
3013                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3014                         if (!strcmp(setup->task_name, task_name)) {
3015                                 template = *setup;
3016                                 break;
3017                         }
3018                 }
3019                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3020                 template.periods = simple_strtoul(str, NULL, 10);
3021                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3022                 template.period_size = simple_strtoul(str, NULL, 10);
3023                 for (idx1 = 31; idx1 >= 0; idx1--)
3024                         if (template.period_size & (1 << idx1))
3025                                 break;
3026                 for (idx1--; idx1 >= 0; idx1--)
3027                         template.period_size &= ~(1 << idx1);
3028                 do {
3029                         ptr = snd_info_get_str(str, ptr, sizeof(str));
3030                         if (!strcmp(str, "disable")) {
3031                                 template.disable = 1;
3032                         } else if (!strcmp(str, "direct")) {
3033                                 template.direct = 1;
3034                         } else if (!strcmp(str, "block")) {
3035                                 template.block = 1;
3036                         } else if (!strcmp(str, "non-block")) {
3037                                 template.nonblock = 1;
3038                         } else if (!strcmp(str, "partial-frag")) {
3039                                 template.partialfrag = 1;
3040                         } else if (!strcmp(str, "no-silence")) {
3041                                 template.nosilence = 1;
3042                         } else if (!strcmp(str, "buggy-ptr")) {
3043                                 template.buggyptr = 1;
3044                         }
3045                 } while (*str);
3046                 if (setup == NULL) {
3047                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3048                         if (! setup) {
3049                                 buffer->error = -ENOMEM;
3050                                 mutex_unlock(&pstr->oss.setup_mutex);
3051                                 return;
3052                         }
3053                         if (pstr->oss.setup_list == NULL)
3054                                 pstr->oss.setup_list = setup;
3055                         else {
3056                                 for (setup1 = pstr->oss.setup_list;
3057                                      setup1->next; setup1 = setup1->next);
3058                                 setup1->next = setup;
3059                         }
3060                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3061                         if (! template.task_name) {
3062                                 kfree(setup);
3063                                 buffer->error = -ENOMEM;
3064                                 mutex_unlock(&pstr->oss.setup_mutex);
3065                                 return;
3066                         }
3067                 }
3068                 *setup = template;
3069                 mutex_unlock(&pstr->oss.setup_mutex);
3070         }
3071 }
3072
3073 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3074 {
3075         int stream;
3076         for (stream = 0; stream < 2; ++stream) {
3077                 struct snd_info_entry *entry;
3078                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3079                 if (pstr->substream_count == 0)
3080                         continue;
3081                 entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3082                 if (entry) {
3083                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3084                         entry->mode = S_IFREG | 0644;
3085                         entry->c.text.read = snd_pcm_oss_proc_read;
3086                         entry->c.text.write = snd_pcm_oss_proc_write;
3087                         entry->private_data = pstr;
3088                         if (snd_info_register(entry) < 0) {
3089                                 snd_info_free_entry(entry);
3090                                 entry = NULL;
3091                         }
3092                 }
3093                 pstr->oss.proc_entry = entry;
3094         }
3095 }
3096
3097 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3098 {
3099         int stream;
3100         for (stream = 0; stream < 2; ++stream) {
3101                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3102                 snd_info_free_entry(pstr->oss.proc_entry);
3103                 pstr->oss.proc_entry = NULL;
3104                 snd_pcm_oss_proc_free_setup_list(pstr);
3105         }
3106 }
3107 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3108 static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3109 {
3110 }
3111 static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3112 {
3113 }
3114 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3115
3116 /*
3117  *  ENTRY functions
3118  */
3119
3120 static const struct file_operations snd_pcm_oss_f_reg =
3121 {
3122         .owner =        THIS_MODULE,
3123         .read =         snd_pcm_oss_read,
3124         .write =        snd_pcm_oss_write,
3125         .open =         snd_pcm_oss_open,
3126         .release =      snd_pcm_oss_release,
3127         .llseek =       no_llseek,
3128         .poll =         snd_pcm_oss_poll,
3129         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3130         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3131         .mmap =         snd_pcm_oss_mmap,
3132 };
3133
3134 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3135 {
3136         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3137                                     pcm->card, index, &snd_pcm_oss_f_reg,
3138                                     pcm) < 0) {
3139                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3140                            pcm->card->number, pcm->device);
3141         }
3142 }
3143
3144 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3145 {
3146         pcm->oss.reg = 0;
3147         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3148                 char name[128];
3149                 int duplex;
3150                 register_oss_dsp(pcm, 0);
3151                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3152                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3153                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3154                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3155 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3156                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3157                                       pcm->card->number,
3158                                       name);
3159 #endif
3160                 pcm->oss.reg++;
3161                 pcm->oss.reg_mask |= 1;
3162         }
3163         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3164                 register_oss_dsp(pcm, 1);
3165                 pcm->oss.reg++;
3166                 pcm->oss.reg_mask |= 2;
3167         }
3168
3169         if (pcm->oss.reg)
3170                 snd_pcm_oss_proc_init(pcm);
3171
3172         return 0;
3173 }
3174
3175 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3176 {
3177         if (pcm->oss.reg) {
3178                 if (pcm->oss.reg_mask & 1) {
3179                         pcm->oss.reg_mask &= ~1;
3180                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3181                                                   pcm->card, 0);
3182                 }
3183                 if (pcm->oss.reg_mask & 2) {
3184                         pcm->oss.reg_mask &= ~2;
3185                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3186                                                   pcm->card, 1);
3187                 }
3188                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3189 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3190                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3191 #endif
3192                 }
3193                 pcm->oss.reg = 0;
3194         }
3195         return 0;
3196 }
3197
3198 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3199 {
3200         snd_pcm_oss_disconnect_minor(pcm);
3201         snd_pcm_oss_proc_done(pcm);
3202         return 0;
3203 }
3204
3205 static struct snd_pcm_notify snd_pcm_oss_notify =
3206 {
3207         .n_register =   snd_pcm_oss_register_minor,
3208         .n_disconnect = snd_pcm_oss_disconnect_minor,
3209         .n_unregister = snd_pcm_oss_unregister_minor,
3210 };
3211
3212 static int __init alsa_pcm_oss_init(void)
3213 {
3214         int i;
3215         int err;
3216
3217         /* check device map table */
3218         for (i = 0; i < SNDRV_CARDS; i++) {
3219                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3220                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3221                                    i, dsp_map[i]);
3222                         dsp_map[i] = 0;
3223                 }
3224                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3225                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3226                                    i, adsp_map[i]);
3227                         adsp_map[i] = 1;
3228                 }
3229         }
3230         err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3231         if (err < 0)
3232                 return err;
3233         return 0;
3234 }
3235
3236 static void __exit alsa_pcm_oss_exit(void)
3237 {
3238         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3239 }
3240
3241 module_init(alsa_pcm_oss_init)
3242 module_exit(alsa_pcm_oss_exit)