sound/core/oss/pcm_oss.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer / OSS compatible
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #if 0
  23 #define PLUGIN_DEBUG
  24 #endif
  25 #if 0
  26 #define OSS_DEBUG
  27 #endif
  28
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/time.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/module.h>
  34 #include <linux/math64.h>
  35 #include <linux/string.h>
  36 #include <sound/core.h>
  37 #include <sound/minors.h>
  38 #include <sound/pcm.h>
  39 #include <sound/pcm_params.h>
  40 #include "pcm_plugin.h"
  41 #include <sound/info.h>
  42 #include <linux/soundcard.h>
  43 #include <sound/initval.h>
  44 #include <sound/mixer_oss.h>
  45
  46 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
  47
  48 static int dsp_map[SNDRV_CARDS];
  49 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  50 static bool nonblock_open = 1;
  51
  52 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  53 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  54 MODULE_LICENSE("GPL");
  55 module_param_array(dsp_map, int, NULL, 0444);
  56 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  57 module_param_array(adsp_map, int, NULL, 0444);
  58 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  59 module_param(nonblock_open, bool, 0644);
  60 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  61 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  62 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
  63
  64 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  65 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  66 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
  67
  68 static inline mm_segment_t snd_enter_user(void)
  69 {
  70         mm_segment_t fs = get_fs();
  71         set_fs(get_ds());
  72         return fs;
  73 }
  74
  75 static inline void snd_leave_user(mm_segment_t fs)
  76 {
  77         set_fs(fs);
  78 }
  79
  80 /*
  81  * helper functions to process hw_params
  82  */
  83 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  84 {
  85         int changed = 0;
  86         if (i->min < min) {
  87                 i->min = min;
  88                 i->openmin = openmin;
  89                 changed = 1;
  90         } else if (i->min == min && !i->openmin && openmin) {
  91                 i->openmin = 1;
  92                 changed = 1;
  93         }
  94         if (i->integer) {
  95                 if (i->openmin) {
  96                         i->min++;
  97                         i->openmin = 0;
  98                 }
  99         }
 100         if (snd_interval_checkempty(i)) {
 101                 snd_interval_none(i);
 102                 return -EINVAL;
 103         }
 104         return changed;
 105 }
 106
 107 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
 108 {
 109         int changed = 0;
 110         if (i->max > max) {
 111                 i->max = max;
 112                 i->openmax = openmax;
 113                 changed = 1;
 114         } else if (i->max == max && !i->openmax && openmax) {
 115                 i->openmax = 1;
 116                 changed = 1;
 117         }
 118         if (i->integer) {
 119                 if (i->openmax) {
 120                         i->max--;
 121                         i->openmax = 0;
 122                 }
 123         }
 124         if (snd_interval_checkempty(i)) {
 125                 snd_interval_none(i);
 126                 return -EINVAL;
 127         }
 128         return changed;
 129 }
 130
 131 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 132 {
 133         struct snd_interval t;
 134         t.empty = 0;
 135         t.min = t.max = val;
 136         t.openmin = t.openmax = 0;
 137         t.integer = 1;
 138         return snd_interval_refine(i, &t);
 139 }
 140
 141 /**
 142  * snd_pcm_hw_param_value_min
 143  * @params: the hw_params instance
 144  * @var: parameter to retrieve
 145  * @dir: pointer to the direction (-1,0,1) or NULL
 146  *
 147  * Return the minimum value for field PAR.
 148  */
 149 static unsigned int
 150 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
 151                            snd_pcm_hw_param_t var, int *dir)
 152 {
 153         if (hw_is_mask(var)) {
 154                 if (dir)
 155                         *dir = 0;
 156                 return snd_mask_min(hw_param_mask_c(params, var));
 157         }
 158         if (hw_is_interval(var)) {
 159                 const struct snd_interval *i = hw_param_interval_c(params, var);
 160                 if (dir)
 161                         *dir = i->openmin;
 162                 return snd_interval_min(i);
 163         }
 164         return -EINVAL;
 165 }
 166
 167 /**
 168  * snd_pcm_hw_param_value_max
 169  * @params: the hw_params instance
 170  * @var: parameter to retrieve
 171  * @dir: pointer to the direction (-1,0,1) or NULL
 172  *
 173  * Return the maximum value for field PAR.
 174  */
 175 static int
 176 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
 177                            snd_pcm_hw_param_t var, int *dir)
 178 {
 179         if (hw_is_mask(var)) {
 180                 if (dir)
 181                         *dir = 0;
 182                 return snd_mask_max(hw_param_mask_c(params, var));
 183         }
 184         if (hw_is_interval(var)) {
 185                 const struct snd_interval *i = hw_param_interval_c(params, var);
 186                 if (dir)
 187                         *dir = - (int) i->openmax;
 188                 return snd_interval_max(i);
 189         }
 190         return -EINVAL;
 191 }
 192
 193 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
 194                                   snd_pcm_hw_param_t var,
 195                                   const struct snd_mask *val)
 196 {
 197         int changed;
 198         changed = snd_mask_refine(hw_param_mask(params, var), val);
 199         if (changed) {
 200                 params->cmask |= 1 << var;
 201                 params->rmask |= 1 << var;
 202         }
 203         return changed;
 204 }
 205
 206 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
 207                                  struct snd_pcm_hw_params *params,
 208                                  snd_pcm_hw_param_t var,
 209                                  const struct snd_mask *val)
 210 {
 211         int changed = _snd_pcm_hw_param_mask(params, var, val);
 212         if (changed < 0)
 213                 return changed;
 214         if (params->rmask) {
 215                 int err = snd_pcm_hw_refine(pcm, params);
 216                 if (err < 0)
 217                         return err;
 218         }
 219         return 0;
 220 }
 221
 222 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
 223                                  snd_pcm_hw_param_t var, unsigned int val,
 224                                  int dir)
 225 {
 226         int changed;
 227         int open = 0;
 228         if (dir) {
 229                 if (dir > 0) {
 230                         open = 1;
 231                 } else if (dir < 0) {
 232                         if (val > 0) {
 233                                 open = 1;
 234                                 val--;
 235                         }
 236                 }
 237         }
 238         if (hw_is_mask(var))
 239                 changed = snd_mask_refine_min(hw_param_mask(params, var),
 240                                               val + !!open);
 241         else if (hw_is_interval(var))
 242                 changed = snd_interval_refine_min(hw_param_interval(params, var),
 243                                                   val, open);
 244         else
 245                 return -EINVAL;
 246         if (changed) {
 247                 params->cmask |= 1 << var;
 248                 params->rmask |= 1 << var;
 249         }
 250         return changed;
 251 }
 252
 253 /**
 254  * snd_pcm_hw_param_min
 255  * @pcm: PCM instance
 256  * @params: the hw_params instance
 257  * @var: parameter to retrieve
 258  * @val: minimal value
 259  * @dir: pointer to the direction (-1,0,1) or NULL
 260  *
 261  * Inside configuration space defined by PARAMS remove from PAR all
 262  * values < VAL. Reduce configuration space accordingly.
 263  * Return new minimum or -EINVAL if the configuration space is empty
 264  */
 265 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
 266                                 struct snd_pcm_hw_params *params,
 267                                 snd_pcm_hw_param_t var, unsigned int val,
 268                                 int *dir)
 269 {
 270         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
 271         if (changed < 0)
 272                 return changed;
 273         if (params->rmask) {
 274                 int err = snd_pcm_hw_refine(pcm, params);
 275                 if (err < 0)
 276                         return err;
 277         }
 278         return snd_pcm_hw_param_value_min(params, var, dir);
 279 }
 280
 281 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
 282                                  snd_pcm_hw_param_t var, unsigned int val,
 283                                  int dir)
 284 {
 285         int changed;
 286         int open = 0;
 287         if (dir) {
 288                 if (dir < 0) {
 289                         open = 1;
 290                 } else if (dir > 0) {
 291                         open = 1;
 292                         val++;
 293                 }
 294         }
 295         if (hw_is_mask(var)) {
 296                 if (val == 0 && open) {
 297                         snd_mask_none(hw_param_mask(params, var));
 298                         changed = -EINVAL;
 299                 } else
 300                         changed = snd_mask_refine_max(hw_param_mask(params, var),
 301                                                       val - !!open);
 302         } else if (hw_is_interval(var))
 303                 changed = snd_interval_refine_max(hw_param_interval(params, var),
 304                                                   val, open);
 305         else
 306                 return -EINVAL;
 307         if (changed) {
 308                 params->cmask |= 1 << var;
 309                 params->rmask |= 1 << var;
 310         }
 311         return changed;
 312 }
 313
 314 /**
 315  * snd_pcm_hw_param_max
 316  * @pcm: PCM instance
 317  * @params: the hw_params instance
 318  * @var: parameter to retrieve
 319  * @val: maximal value
 320  * @dir: pointer to the direction (-1,0,1) or NULL
 321  *
 322  * Inside configuration space defined by PARAMS remove from PAR all
 323  *  values >= VAL + 1. Reduce configuration space accordingly.
 324  *  Return new maximum or -EINVAL if the configuration space is empty
 325  */
 326 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
 327                                 struct snd_pcm_hw_params *params,
 328                                 snd_pcm_hw_param_t var, unsigned int val,
 329                                 int *dir)
 330 {
 331         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
 332         if (changed < 0)
 333                 return changed;
 334         if (params->rmask) {
 335                 int err = snd_pcm_hw_refine(pcm, params);
 336                 if (err < 0)
 337                         return err;
 338         }
 339         return snd_pcm_hw_param_value_max(params, var, dir);
 340 }
 341
 342 static int boundary_sub(int a, int adir,
 343                         int b, int bdir,
 344                         int *c, int *cdir)
 345 {
 346         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
 347         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
 348         *c = a - b;
 349         *cdir = adir - bdir;
 350         if (*cdir == -2) {
 351                 (*c)--;
 352         } else if (*cdir == 2) {
 353                 (*c)++;
 354         }
 355         return 0;
 356 }
 357
 358 static int boundary_lt(unsigned int a, int adir,
 359                        unsigned int b, int bdir)
 360 {
 361         if (adir < 0) {
 362                 a--;
 363                 adir = 1;
 364         } else if (adir > 0)
 365                 adir = 1;
 366         if (bdir < 0) {
 367                 b--;
 368                 bdir = 1;
 369         } else if (bdir > 0)
 370                 bdir = 1;
 371         return a < b || (a == b && adir < bdir);
 372 }
 373
 374 /* Return 1 if min is nearer to best than max */
 375 static int boundary_nearer(int min, int mindir,
 376                            int best, int bestdir,
 377                            int max, int maxdir)
 378 {
 379         int dmin, dmindir;
 380         int dmax, dmaxdir;
 381         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
 382         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
 383         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
 384 }
 385
 386 /**
 387  * snd_pcm_hw_param_near
 388  * @pcm: PCM instance
 389  * @params: the hw_params instance
 390  * @var: parameter to retrieve
 391  * @best: value to set
 392  * @dir: pointer to the direction (-1,0,1) or NULL
 393  *
 394  * Inside configuration space defined by PARAMS set PAR to the available value
 395  * nearest to VAL. Reduce configuration space accordingly.
 396  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
 397  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
 398  * Return the value found.
 399   */
 400 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 401                                  struct snd_pcm_hw_params *params,
 402                                  snd_pcm_hw_param_t var, unsigned int best,
 403                                  int *dir)
 404 {
 405         struct snd_pcm_hw_params *save = NULL;
 406         int v;
 407         unsigned int saved_min;
 408         int last = 0;
 409         int min, max;
 410         int mindir, maxdir;
 411         int valdir = dir ? *dir : 0;
 412         /* FIXME */
 413         if (best > INT_MAX)
 414                 best = INT_MAX;
 415         min = max = best;
 416         mindir = maxdir = valdir;
 417         if (maxdir > 0)
 418                 maxdir = 0;
 419         else if (maxdir == 0)
 420                 maxdir = -1;
 421         else {
 422                 maxdir = 1;
 423                 max--;
 424         }
 425         save = kmalloc(sizeof(*save), GFP_KERNEL);
 426         if (save == NULL)
 427                 return -ENOMEM;
 428         *save = *params;
 429         saved_min = min;
 430         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
 431         if (min >= 0) {
 432                 struct snd_pcm_hw_params *params1;
 433                 if (max < 0)
 434                         goto _end;
 435                 if ((unsigned int)min == saved_min && mindir == valdir)
 436                         goto _end;
 437                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
 438                 if (params1 == NULL) {
 439                         kfree(save);
 440                         return -ENOMEM;
 441                 }
 442                 *params1 = *save;
 443                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
 444                 if (max < 0) {
 445                         kfree(params1);
 446                         goto _end;
 447                 }
 448                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
 449                         *params = *params1;
 450                         last = 1;
 451                 }
 452                 kfree(params1);
 453         } else {
 454                 *params = *save;
 455                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
 456                 if (max < 0) {
 457                         kfree(save);
 458                         return max;
 459                 }
 460                 last = 1;
 461         }
 462  _end:
 463         kfree(save);
 464         if (last)
 465                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
 466         else
 467                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
 468         return v;
 469 }
 470
 471 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
 472                                  snd_pcm_hw_param_t var, unsigned int val,
 473                                  int dir)
 474 {
 475         int changed;
 476         if (hw_is_mask(var)) {
 477                 struct snd_mask *m = hw_param_mask(params, var);
 478                 if (val == 0 && dir < 0) {
 479                         changed = -EINVAL;
 480                         snd_mask_none(m);
 481                 } else {
 482                         if (dir > 0)
 483                                 val++;
 484                         else if (dir < 0)
 485                                 val--;
 486                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
 487                 }
 488         } else if (hw_is_interval(var)) {
 489                 struct snd_interval *i = hw_param_interval(params, var);
 490                 if (val == 0 && dir < 0) {
 491                         changed = -EINVAL;
 492                         snd_interval_none(i);
 493                 } else if (dir == 0)
 494                         changed = snd_interval_refine_set(i, val);
 495                 else {
 496                         struct snd_interval t;
 497                         t.openmin = 1;
 498                         t.openmax = 1;
 499                         t.empty = 0;
 500                         t.integer = 0;
 501                         if (dir < 0) {
 502                                 t.min = val - 1;
 503                                 t.max = val;
 504                         } else {
 505                                 t.min = val;
 506                                 t.max = val+1;
 507                         }
 508                         changed = snd_interval_refine(i, &t);
 509                 }
 510         } else
 511                 return -EINVAL;
 512         if (changed) {
 513                 params->cmask |= 1 << var;
 514                 params->rmask |= 1 << var;
 515         }
 516         return changed;
 517 }
 518
 519 /**
 520  * snd_pcm_hw_param_set
 521  * @pcm: PCM instance
 522  * @params: the hw_params instance
 523  * @var: parameter to retrieve
 524  * @val: value to set
 525  * @dir: pointer to the direction (-1,0,1) or NULL
 526  *
 527  * Inside configuration space defined by PARAMS remove from PAR all
 528  * values != VAL. Reduce configuration space accordingly.
 529  *  Return VAL or -EINVAL if the configuration space is empty
 530  */
 531 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 532                                 struct snd_pcm_hw_params *params,
 533                                 snd_pcm_hw_param_t var, unsigned int val,
 534                                 int dir)
 535 {
 536         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
 537         if (changed < 0)
 538                 return changed;
 539         if (params->rmask) {
 540                 int err = snd_pcm_hw_refine(pcm, params);
 541                 if (err < 0)
 542                         return err;
 543         }
 544         return snd_pcm_hw_param_value(params, var, NULL);
 545 }
 546
 547 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
 548                                         snd_pcm_hw_param_t var)
 549 {
 550         int changed;
 551         changed = snd_interval_setinteger(hw_param_interval(params, var));
 552         if (changed) {
 553                 params->cmask |= 1 << var;
 554                 params->rmask |= 1 << var;
 555         }
 556         return changed;
 557 }
 558
 559 /*
 560  * plugin
 561  */
 562
 563 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 564 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 565 {
 566         struct snd_pcm_runtime *runtime = substream->runtime;
 567         struct snd_pcm_plugin *plugin, *next;
 568
 569         plugin = runtime->oss.plugin_first;
 570         while (plugin) {
 571                 next = plugin->next;
 572                 snd_pcm_plugin_free(plugin);
 573                 plugin = next;
 574         }
 575         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
 576         return 0;
 577 }
 578
 579 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
 580 {
 581         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 582         plugin->next = runtime->oss.plugin_first;
 583         plugin->prev = NULL;
 584         if (runtime->oss.plugin_first) {
 585                 runtime->oss.plugin_first->prev = plugin;
 586                 runtime->oss.plugin_first = plugin;
 587         } else {
 588                 runtime->oss.plugin_last =
 589                 runtime->oss.plugin_first = plugin;
 590         }
 591         return 0;
 592 }
 593
 594 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
 595 {
 596         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 597         plugin->next = NULL;
 598         plugin->prev = runtime->oss.plugin_last;
 599         if (runtime->oss.plugin_last) {
 600                 runtime->oss.plugin_last->next = plugin;
 601                 runtime->oss.plugin_last = plugin;
 602         } else {
 603                 runtime->oss.plugin_last =
 604                 runtime->oss.plugin_first = plugin;
 605         }
 606         return 0;
 607 }
 608 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
 609
 610 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
 611 {
 612         struct snd_pcm_runtime *runtime = substream->runtime;
 613         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 614         long bytes = frames_to_bytes(runtime, frames);
 615         if (buffer_size == runtime->oss.buffer_bytes)
 616                 return bytes;
 617 #if BITS_PER_LONG >= 64
 618         return runtime->oss.buffer_bytes * bytes / buffer_size;
 619 #else
 620         {
 621                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
 622                 return div_u64(bsize, buffer_size);
 623         }
 624 #endif
 625 }
 626
 627 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 628 {
 629         struct snd_pcm_runtime *runtime = substream->runtime;
 630         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 631         if (buffer_size == runtime->oss.buffer_bytes)
 632                 return bytes_to_frames(runtime, bytes);
 633         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 634 }
 635
 636 static inline
 637 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 638 {
 639         return runtime->hw_ptr_interrupt;
 640 }
 641
 642 /* define extended formats in the recent OSS versions (if any) */
 643 /* linear formats */
 644 #define AFMT_S32_LE      0x00001000
 645 #define AFMT_S32_BE      0x00002000
 646 #define AFMT_S24_LE      0x00008000
 647 #define AFMT_S24_BE      0x00010000
 648 #define AFMT_S24_PACKED  0x00040000
 649
 650 /* other supported formats */
 651 #define AFMT_FLOAT       0x00004000
 652 #define AFMT_SPDIF_RAW   0x00020000
 653
 654 /* unsupported formats */
 655 #define AFMT_AC3         0x00000400
 656 #define AFMT_VORBIS      0x00000800
 657
 658 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
 659 {
 660         switch (format) {
 661         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
 662         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
 663         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
 664         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
 665         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
 666         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
 667         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
 668         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
 669         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
 670         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
 671         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
 672         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
 673         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
 674         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
 675         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
 676         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
 677         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
 678         default:                return SNDRV_PCM_FORMAT_U8;
 679         }
 680 }
 681
 682 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
 683 {
 684         switch (format) {
 685         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
 686         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
 687         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
 688         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
 689         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
 690         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
 691         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
 692         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
 693         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
 694         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
 695         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
 696         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
 697         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
 698         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
 699         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
 700         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
 701         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
 702         default:                        return -EINVAL;
 703         }
 704 }
 705
 706 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
 707                                    struct snd_pcm_hw_params *oss_params,
 708                                    struct snd_pcm_hw_params *slave_params)
 709 {
 710         ssize_t s;
 711         ssize_t oss_buffer_size;
 712         ssize_t oss_period_size, oss_periods;
 713         ssize_t min_period_size, max_period_size;
 714         struct snd_pcm_runtime *runtime = substream->runtime;
 715         size_t oss_frame_size;
 716
 717         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
 718                          params_channels(oss_params) / 8;
 719
 720         oss_buffer_size = snd_pcm_hw_param_value_max(slave_params,
 721                                                      SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 722                                                      NULL);
 723         if (oss_buffer_size <= 0)
 724                 return -EINVAL;
 725         oss_buffer_size = snd_pcm_plug_client_size(substream,
 726                                                    oss_buffer_size * oss_frame_size);
 727         if (oss_buffer_size <= 0)
 728                 return -EINVAL;
 729         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
 730         if (atomic_read(&substream->mmap_count)) {
 731                 if (oss_buffer_size > runtime->oss.mmap_bytes)
 732                         oss_buffer_size = runtime->oss.mmap_bytes;
 733         }
 734
 735         if (substream->oss.setup.period_size > 16)
 736                 oss_period_size = substream->oss.setup.period_size;
 737         else if (runtime->oss.fragshift) {
 738                 oss_period_size = 1 << runtime->oss.fragshift;
 739                 if (oss_period_size > oss_buffer_size / 2)
 740                         oss_period_size = oss_buffer_size / 2;
 741         } else {
 742                 int sd;
 743                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
 744
 745                 oss_period_size = oss_buffer_size;
 746                 do {
 747                         oss_period_size /= 2;
 748                 } while (oss_period_size > bytes_per_sec);
 749                 if (runtime->oss.subdivision == 0) {
 750                         sd = 4;
 751                         if (oss_period_size / sd > 4096)
 752                                 sd *= 2;
 753                         if (oss_period_size / sd < 4096)
 754                                 sd = 1;
 755                 } else
 756                         sd = runtime->oss.subdivision;
 757                 oss_period_size /= sd;
 758                 if (oss_period_size < 16)
 759                         oss_period_size = 16;
 760         }
 761
 762         min_period_size = snd_pcm_plug_client_size(substream,
 763                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 764         if (min_period_size > 0) {
 765                 min_period_size *= oss_frame_size;
 766                 min_period_size = roundup_pow_of_two(min_period_size);
 767                 if (oss_period_size < min_period_size)
 768                         oss_period_size = min_period_size;
 769         }
 770
 771         max_period_size = snd_pcm_plug_client_size(substream,
 772                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 773         if (max_period_size > 0) {
 774                 max_period_size *= oss_frame_size;
 775                 max_period_size = rounddown_pow_of_two(max_period_size);
 776                 if (oss_period_size > max_period_size)
 777                         oss_period_size = max_period_size;
 778         }
 779
 780         oss_periods = oss_buffer_size / oss_period_size;
 781
 782         if (substream->oss.setup.periods > 1)
 783                 oss_periods = substream->oss.setup.periods;
 784
 785         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 786         if (s > 0 && runtime->oss.maxfrags && s > runtime->oss.maxfrags)
 787                 s = runtime->oss.maxfrags;
 788         if (oss_periods > s)
 789                 oss_periods = s;
 790
 791         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 792         if (s < 2)
 793                 s = 2;
 794         if (oss_periods < s)
 795                 oss_periods = s;
 796
 797         while (oss_period_size * oss_periods > oss_buffer_size)
 798                 oss_period_size /= 2;
 799
 800         if (oss_period_size < 16)
 801                 return -EINVAL;
 802         runtime->oss.period_bytes = oss_period_size;
 803         runtime->oss.period_frames = 1;
 804         runtime->oss.periods = oss_periods;
 805         return 0;
 806 }
 807
 808 static int choose_rate(struct snd_pcm_substream *substream,
 809                        struct snd_pcm_hw_params *params, unsigned int best_rate)
 810 {
 811         struct snd_interval *it;
 812         struct snd_pcm_hw_params *save;
 813         unsigned int rate, prev;
 814
 815         save = kmalloc(sizeof(*save), GFP_KERNEL);
 816         if (save == NULL)
 817                 return -ENOMEM;
 818         *save = *params;
 819         it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
 820
 821         /* try multiples of the best rate */
 822         rate = best_rate;
 823         for (;;) {
 824                 if (it->max < rate || (it->max == rate && it->openmax))
 825                         break;
 826                 if (it->min < rate || (it->min == rate && !it->openmin)) {
 827                         int ret;
 828                         ret = snd_pcm_hw_param_set(substream, params,
 829                                                    SNDRV_PCM_HW_PARAM_RATE,
 830                                                    rate, 0);
 831                         if (ret == (int)rate) {
 832                                 kfree(save);
 833                                 return rate;
 834                         }
 835                         *params = *save;
 836                 }
 837                 prev = rate;
 838                 rate += best_rate;
 839                 if (rate <= prev)
 840                         break;
 841         }
 842
 843         /* not found, use the nearest rate */
 844         kfree(save);
 845         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
 846 }
 847
 848 /* parameter locking: returns immediately if tried during streaming */
 849 static int lock_params(struct snd_pcm_runtime *runtime)
 850 {
 851         if (mutex_lock_interruptible(&runtime->oss.params_lock))
 852                 return -ERESTARTSYS;
 853         if (atomic_read(&runtime->oss.rw_ref)) {
 854                 mutex_unlock(&runtime->oss.params_lock);
 855                 return -EBUSY;
 856         }
 857         return 0;
 858 }
 859
 860 static void unlock_params(struct snd_pcm_runtime *runtime)
 861 {
 862         mutex_unlock(&runtime->oss.params_lock);
 863 }
 864
 865 /* call with params_lock held */
 866 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
 867 {
 868         struct snd_pcm_runtime *runtime = substream->runtime;
 869         struct snd_pcm_hw_params *params, *sparams;
 870         struct snd_pcm_sw_params *sw_params;
 871         ssize_t oss_buffer_size, oss_period_size;
 872         size_t oss_frame_size;
 873         int err;
 874         int direct;
 875         snd_pcm_format_t format, sformat;
 876         int n;
 877         struct snd_mask sformat_mask;
 878         struct snd_mask mask;
 879
 880         if (!runtime->oss.params)
 881                 return 0;
 882         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
 883         params = kmalloc(sizeof(*params), GFP_KERNEL);
 884         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
 885         if (!sw_params || !params || !sparams) {
 886                 err = -ENOMEM;
 887                 goto failure;
 888         }
 889
 890         if (atomic_read(&substream->mmap_count))
 891                 direct = 1;
 892         else
 893                 direct = substream->oss.setup.direct;
 894
 895         _snd_pcm_hw_params_any(sparams);
 896         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
 897         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
 898         snd_mask_none(&mask);
 899         if (atomic_read(&substream->mmap_count))
 900                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
 901         else {
 902                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 903                 if (!direct)
 904                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 905         }
 906         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
 907         if (err < 0) {
 908                 pcm_dbg(substream->pcm, "No usable accesses\n");
 909                 err = -EINVAL;
 910                 goto failure;
 911         }
 912
 913         err = choose_rate(substream, sparams, runtime->oss.rate);
 914         if (err < 0)
 915                 goto failure;
 916         err = snd_pcm_hw_param_near(substream, sparams,
 917                                     SNDRV_PCM_HW_PARAM_CHANNELS,
 918                                     runtime->oss.channels, NULL);
 919         if (err < 0)
 920                 goto failure;
 921
 922         format = snd_pcm_oss_format_from(runtime->oss.format);
 923
 924         sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
 925         if (direct)
 926                 sformat = format;
 927         else
 928                 sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
 929
 930         if ((__force int)sformat < 0 ||
 931             !snd_mask_test(&sformat_mask, (__force int)sformat)) {
 932                 for (sformat = (__force snd_pcm_format_t)0;
 933                      (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
 934                      sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
 935                         if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
 936                             snd_pcm_oss_format_to(sformat) >= 0)
 937                                 break;
 938                 }
 939                 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
 940                         pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
 941                         err = -EINVAL;
 942                         goto failure;
 943                 }
 944         }
 945         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
 946         if (err < 0)
 947                 goto failure;
 948
 949         if (direct) {
 950                 memcpy(params, sparams, sizeof(*params));
 951         } else {
 952                 _snd_pcm_hw_params_any(params);
 953                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
 954                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
 955                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
 956                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
 957                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
 958                                       runtime->oss.channels, 0);
 959                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
 960                                       runtime->oss.rate, 0);
 961                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
 962                          params_access(params), params_format(params),
 963                          params_channels(params), params_rate(params));
 964         }
 965         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
 966                  params_access(sparams), params_format(sparams),
 967                  params_channels(sparams), params_rate(sparams));
 968
 969         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
 970                          params_channels(params) / 8;
 971
 972         err = snd_pcm_oss_period_size(substream, params, sparams);
 973         if (err < 0)
 974                 goto failure;
 975
 976         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
 977         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
 978         if (err < 0)
 979                 goto failure;
 980
 981         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
 982                                      runtime->oss.periods, NULL);
 983         if (err < 0)
 984                 goto failure;
 985
 986         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
 987
 988         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
 989         if (err < 0) {
 990                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
 991                 goto failure;
 992         }
 993
 994 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 995         snd_pcm_oss_plugin_clear(substream);
 996         if (!direct) {
 997                 /* add necessary plugins */
 998                 snd_pcm_oss_plugin_clear(substream);
 999                 if ((err = snd_pcm_plug_format_plugins(substream,
1000                                                        params,
1001                                                        sparams)) < 0) {
1002                         pcm_dbg(substream->pcm,
1003                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
1004                         snd_pcm_oss_plugin_clear(substream);
1005                         goto failure;
1006                 }
1007                 if (runtime->oss.plugin_first) {
1008                         struct snd_pcm_plugin *plugin;
1009                         if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
1010                                 pcm_dbg(substream->pcm,
1011                                         "snd_pcm_plugin_build_io failed: %i\n", err);
1012                                 snd_pcm_oss_plugin_clear(substream);
1013                                 goto failure;
1014                         }
1015                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1016                                 err = snd_pcm_plugin_append(plugin);
1017                         } else {
1018                                 err = snd_pcm_plugin_insert(plugin);
1019                         }
1020                         if (err < 0) {
1021                                 snd_pcm_oss_plugin_clear(substream);
1022                                 goto failure;
1023                         }
1024                 }
1025         }
1026 #endif
1027
1028         if (runtime->oss.trigger) {
1029                 sw_params->start_threshold = 1;
1030         } else {
1031                 sw_params->start_threshold = runtime->boundary;
1032         }
1033         if (atomic_read(&substream->mmap_count) ||
1034             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1035                 sw_params->stop_threshold = runtime->boundary;
1036         else
1037                 sw_params->stop_threshold = runtime->buffer_size;
1038         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1039         sw_params->period_step = 1;
1040         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1041                 1 : runtime->period_size;
1042         if (atomic_read(&substream->mmap_count) ||
1043             substream->oss.setup.nosilence) {
1044                 sw_params->silence_threshold = 0;
1045                 sw_params->silence_size = 0;
1046         } else {
1047                 snd_pcm_uframes_t frames;
1048                 frames = runtime->period_size + 16;
1049                 if (frames > runtime->buffer_size)
1050                         frames = runtime->buffer_size;
1051                 sw_params->silence_threshold = frames;
1052                 sw_params->silence_size = frames;
1053         }
1054
1055         if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1056                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1057                 goto failure;
1058         }
1059
1060         runtime->oss.periods = params_periods(sparams);
1061         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1062         if (oss_period_size < 0) {
1063                 err = -EINVAL;
1064                 goto failure;
1065         }
1066 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1067         if (runtime->oss.plugin_first) {
1068                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1069                 if (err < 0)
1070                         goto failure;
1071         }
1072 #endif
1073         oss_period_size *= oss_frame_size;
1074
1075         oss_buffer_size = oss_period_size * runtime->oss.periods;
1076         if (oss_buffer_size < 0) {
1077                 err = -EINVAL;
1078                 goto failure;
1079         }
1080
1081         runtime->oss.period_bytes = oss_period_size;
1082         runtime->oss.buffer_bytes = oss_buffer_size;
1083
1084         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1085                  runtime->oss.period_bytes,
1086                  runtime->oss.buffer_bytes);
1087         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1088                  params_period_size(sparams),
1089                  params_buffer_size(sparams));
1090
1091         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1092         runtime->oss.channels = params_channels(params);
1093         runtime->oss.rate = params_rate(params);
1094
1095         vfree(runtime->oss.buffer);
1096         runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1097         if (!runtime->oss.buffer) {
1098                 err = -ENOMEM;
1099                 goto failure;
1100         }
1101
1102         runtime->oss.params = 0;
1103         runtime->oss.prepare = 1;
1104         runtime->oss.buffer_used = 0;
1105         if (runtime->dma_area)
1106                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1107
1108         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1109
1110         err = 0;
1111 failure:
1112         kfree(sw_params);
1113         kfree(params);
1114         kfree(sparams);
1115         return err;
1116 }
1117
1118 /* this one takes the lock by itself */
1119 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1120                                      bool trylock)
1121 {
1122         struct snd_pcm_runtime *runtime = substream->runtime;
1123         int err;
1124
1125         if (trylock) {
1126                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1127                         return -EAGAIN;
1128         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1129                 return -ERESTARTSYS;
1130
1131         err = snd_pcm_oss_change_params_locked(substream);
1132         mutex_unlock(&runtime->oss.params_lock);
1133         return err;
1134 }
1135
1136 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1137 {
1138         int idx, err;
1139         struct snd_pcm_substream *asubstream = NULL, *substream;
1140
1141         for (idx = 0; idx < 2; idx++) {
1142                 substream = pcm_oss_file->streams[idx];
1143                 if (substream == NULL)
1144                         continue;
1145                 if (asubstream == NULL)
1146                         asubstream = substream;
1147                 if (substream->runtime->oss.params) {
1148                         err = snd_pcm_oss_change_params(substream, false);
1149                         if (err < 0)
1150                                 return err;
1151                 }
1152         }
1153         if (!asubstream)
1154                 return -EIO;
1155         if (r_substream)
1156                 *r_substream = asubstream;
1157         return 0;
1158 }
1159
1160 /* call with params_lock held */
1161 /* NOTE: this always call PREPARE unconditionally no matter whether
1162  * runtime->oss.prepare is set or not
1163  */
1164 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1165 {
1166         int err;
1167         struct snd_pcm_runtime *runtime = substream->runtime;
1168
1169         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1170         if (err < 0) {
1171                 pcm_dbg(substream->pcm,
1172                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1173                 return err;
1174         }
1175         runtime->oss.prepare = 0;
1176         runtime->oss.prev_hw_ptr_period = 0;
1177         runtime->oss.period_ptr = 0;
1178         runtime->oss.buffer_used = 0;
1179
1180         return 0;
1181 }
1182
1183 static int snd_pcm_oss_make_ready(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(substream, false);
1191                 if (err < 0)
1192                         return err;
1193         }
1194         if (runtime->oss.prepare) {
1195                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1196                         return -ERESTARTSYS;
1197                 err = snd_pcm_oss_prepare(substream);
1198                 mutex_unlock(&runtime->oss.params_lock);
1199                 if (err < 0)
1200                         return err;
1201         }
1202         return 0;
1203 }
1204
1205 /* call with params_lock held */
1206 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1207 {
1208         struct snd_pcm_runtime *runtime;
1209         int err;
1210
1211         runtime = substream->runtime;
1212         if (runtime->oss.params) {
1213                 err = snd_pcm_oss_change_params_locked(substream);
1214                 if (err < 0)
1215                         return err;
1216         }
1217         if (runtime->oss.prepare) {
1218                 err = snd_pcm_oss_prepare(substream);
1219                 if (err < 0)
1220                         return err;
1221         }
1222         return 0;
1223 }
1224
1225 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1226 {
1227         struct snd_pcm_runtime *runtime;
1228         snd_pcm_uframes_t frames;
1229         int err = 0;
1230
1231         while (1) {
1232                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1233                 if (err < 0)
1234                         break;
1235                 runtime = substream->runtime;
1236                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1237                         break;
1238                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1239                 /* until avail(delay) <= buffer_size */
1240                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1241                 frames /= runtime->period_size;
1242                 frames *= runtime->period_size;
1243                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1244                 if (err < 0)
1245                         break;
1246         }
1247         return err;
1248 }
1249
1250 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1251 {
1252         struct snd_pcm_runtime *runtime = substream->runtime;
1253         int ret;
1254         while (1) {
1255                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1256                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1257 #ifdef OSS_DEBUG
1258                         pcm_dbg(substream->pcm,
1259                                 "pcm_oss: write: recovering from %s\n",
1260                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1261                                 "XRUN" : "SUSPEND");
1262 #endif
1263                         ret = snd_pcm_oss_prepare(substream);
1264                         if (ret < 0)
1265                                 break;
1266                 }
1267                 if (in_kernel) {
1268                         mm_segment_t fs;
1269                         fs = snd_enter_user();
1270                         ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1271                         snd_leave_user(fs);
1272                 } else {
1273                         ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1274                 }
1275                 if (ret != -EPIPE && ret != -ESTRPIPE)
1276                         break;
1277                 /* test, if we can't store new data, because the stream */
1278                 /* has not been started */
1279                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1280                         return -EAGAIN;
1281         }
1282         return ret;
1283 }
1284
1285 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1286 {
1287         struct snd_pcm_runtime *runtime = substream->runtime;
1288         snd_pcm_sframes_t delay;
1289         int ret;
1290         while (1) {
1291                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1292                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1293 #ifdef OSS_DEBUG
1294                         pcm_dbg(substream->pcm,
1295                                 "pcm_oss: read: recovering from %s\n",
1296                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1297                                 "XRUN" : "SUSPEND");
1298 #endif
1299                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1300                         if (ret < 0)
1301                                 break;
1302                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1303                         ret = snd_pcm_oss_prepare(substream);
1304                         if (ret < 0)
1305                                 break;
1306                 }
1307                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1308                 if (ret < 0)
1309                         break;
1310                 if (in_kernel) {
1311                         mm_segment_t fs;
1312                         fs = snd_enter_user();
1313                         ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1314                         snd_leave_user(fs);
1315                 } else {
1316                         ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1317                 }
1318                 if (ret == -EPIPE) {
1319                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1320                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1321                                 if (ret < 0)
1322                                         break;
1323                         }
1324                         continue;
1325                 }
1326                 if (ret != -ESTRPIPE)
1327                         break;
1328         }
1329         return ret;
1330 }
1331
1332 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1333 {
1334         struct snd_pcm_runtime *runtime = substream->runtime;
1335         int ret;
1336         while (1) {
1337                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1338                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1339 #ifdef OSS_DEBUG
1340                         pcm_dbg(substream->pcm,
1341                                 "pcm_oss: writev: recovering from %s\n",
1342                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1343                                 "XRUN" : "SUSPEND");
1344 #endif
1345                         ret = snd_pcm_oss_prepare(substream);
1346                         if (ret < 0)
1347                                 break;
1348                 }
1349                 if (in_kernel) {
1350                         mm_segment_t fs;
1351                         fs = snd_enter_user();
1352                         ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1353                         snd_leave_user(fs);
1354                 } else {
1355                         ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1356                 }
1357                 if (ret != -EPIPE && ret != -ESTRPIPE)
1358                         break;
1359
1360                 /* test, if we can't store new data, because the stream */
1361                 /* has not been started */
1362                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1363                         return -EAGAIN;
1364         }
1365         return ret;
1366 }
1367
1368 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1369 {
1370         struct snd_pcm_runtime *runtime = substream->runtime;
1371         int ret;
1372         while (1) {
1373                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1374                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1375 #ifdef OSS_DEBUG
1376                         pcm_dbg(substream->pcm,
1377                                 "pcm_oss: readv: recovering from %s\n",
1378                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1379                                 "XRUN" : "SUSPEND");
1380 #endif
1381                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1382                         if (ret < 0)
1383                                 break;
1384                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1385                         ret = snd_pcm_oss_prepare(substream);
1386                         if (ret < 0)
1387                                 break;
1388                 }
1389                 if (in_kernel) {
1390                         mm_segment_t fs;
1391                         fs = snd_enter_user();
1392                         ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1393                         snd_leave_user(fs);
1394                 } else {
1395                         ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1396                 }
1397                 if (ret != -EPIPE && ret != -ESTRPIPE)
1398                         break;
1399         }
1400         return ret;
1401 }
1402
1403 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1404 {
1405         struct snd_pcm_runtime *runtime = substream->runtime;
1406         snd_pcm_sframes_t frames, frames1;
1407 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1408         if (runtime->oss.plugin_first) {
1409                 struct snd_pcm_plugin_channel *channels;
1410                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1411                 if (!in_kernel) {
1412                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1413                                 return -EFAULT;
1414                         buf = runtime->oss.buffer;
1415                 }
1416                 frames = bytes / oss_frame_bytes;
1417                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1418                 if (frames1 < 0)
1419                         return frames1;
1420                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1421                 if (frames1 <= 0)
1422                         return frames1;
1423                 bytes = frames1 * oss_frame_bytes;
1424         } else
1425 #endif
1426         {
1427                 frames = bytes_to_frames(runtime, bytes);
1428                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1429                 if (frames1 <= 0)
1430                         return frames1;
1431                 bytes = frames_to_bytes(runtime, frames1);
1432         }
1433         return bytes;
1434 }
1435
1436 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1437 {
1438         size_t xfer = 0;
1439         ssize_t tmp = 0;
1440         struct snd_pcm_runtime *runtime = substream->runtime;
1441
1442         if (atomic_read(&substream->mmap_count))
1443                 return -ENXIO;
1444
1445         atomic_inc(&runtime->oss.rw_ref);
1446         while (bytes > 0) {
1447                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1448                         tmp = -ERESTARTSYS;
1449                         break;
1450                 }
1451                 tmp = snd_pcm_oss_make_ready_locked(substream);
1452                 if (tmp < 0)
1453                         goto err;
1454                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1455                         tmp = bytes;
1456                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1457                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1458                         if (tmp > 0) {
1459                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1460                                         tmp = -EFAULT;
1461                                         goto err;
1462                                 }
1463                         }
1464                         runtime->oss.buffer_used += tmp;
1465                         buf += tmp;
1466                         bytes -= tmp;
1467                         xfer += tmp;
1468                         if (substream->oss.setup.partialfrag ||
1469                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1470                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1471                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1472                                 if (tmp <= 0)
1473                                         goto err;
1474                                 runtime->oss.bytes += tmp;
1475                                 runtime->oss.period_ptr += tmp;
1476                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1477                                 if (runtime->oss.period_ptr == 0 ||
1478                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1479                                         runtime->oss.buffer_used = 0;
1480                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1481                                         tmp = -EAGAIN;
1482                                         goto err;
1483                                 }
1484                         }
1485                 } else {
1486                         tmp = snd_pcm_oss_write2(substream,
1487                                                  (const char __force *)buf,
1488                                                  runtime->oss.period_bytes, 0);
1489                         if (tmp <= 0)
1490                                 goto err;
1491                         runtime->oss.bytes += tmp;
1492                         buf += tmp;
1493                         bytes -= tmp;
1494                         xfer += tmp;
1495                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1496                             tmp != runtime->oss.period_bytes)
1497                                 tmp = -EAGAIN;
1498                 }
1499  err:
1500                 mutex_unlock(&runtime->oss.params_lock);
1501                 if (tmp < 0)
1502                         break;
1503                 if (signal_pending(current)) {
1504                         tmp = -ERESTARTSYS;
1505                         break;
1506                 }
1507                 tmp = 0;
1508         }
1509         atomic_dec(&runtime->oss.rw_ref);
1510         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1511 }
1512
1513 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1514 {
1515         struct snd_pcm_runtime *runtime = substream->runtime;
1516         snd_pcm_sframes_t frames, frames1;
1517 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1518         char __user *final_dst = (char __force __user *)buf;
1519         if (runtime->oss.plugin_first) {
1520                 struct snd_pcm_plugin_channel *channels;
1521                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1522                 if (!in_kernel)
1523                         buf = runtime->oss.buffer;
1524                 frames = bytes / oss_frame_bytes;
1525                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1526                 if (frames1 < 0)
1527                         return frames1;
1528                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1529                 if (frames1 <= 0)
1530                         return frames1;
1531                 bytes = frames1 * oss_frame_bytes;
1532                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1533                         return -EFAULT;
1534         } else
1535 #endif
1536         {
1537                 frames = bytes_to_frames(runtime, bytes);
1538                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1539                 if (frames1 <= 0)
1540                         return frames1;
1541                 bytes = frames_to_bytes(runtime, frames1);
1542         }
1543         return bytes;
1544 }
1545
1546 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1547 {
1548         size_t xfer = 0;
1549         ssize_t tmp = 0;
1550         struct snd_pcm_runtime *runtime = substream->runtime;
1551
1552         if (atomic_read(&substream->mmap_count))
1553                 return -ENXIO;
1554
1555         atomic_inc(&runtime->oss.rw_ref);
1556         while (bytes > 0) {
1557                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1558                         tmp = -ERESTARTSYS;
1559                         break;
1560                 }
1561                 tmp = snd_pcm_oss_make_ready_locked(substream);
1562                 if (tmp < 0)
1563                         goto err;
1564                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1565                         if (runtime->oss.buffer_used == 0) {
1566                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1567                                 if (tmp <= 0)
1568                                         goto err;
1569                                 runtime->oss.bytes += tmp;
1570                                 runtime->oss.period_ptr = tmp;
1571                                 runtime->oss.buffer_used = tmp;
1572                         }
1573                         tmp = bytes;
1574                         if ((size_t) tmp > runtime->oss.buffer_used)
1575                                 tmp = runtime->oss.buffer_used;
1576                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1577                                 tmp = -EFAULT;
1578                                 goto err;
1579                         }
1580                         buf += tmp;
1581                         bytes -= tmp;
1582                         xfer += tmp;
1583                         runtime->oss.buffer_used -= tmp;
1584                 } else {
1585                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1586                                                 runtime->oss.period_bytes, 0);
1587                         if (tmp <= 0)
1588                                 goto err;
1589                         runtime->oss.bytes += tmp;
1590                         buf += tmp;
1591                         bytes -= tmp;
1592                         xfer += tmp;
1593                 }
1594  err:
1595                 mutex_unlock(&runtime->oss.params_lock);
1596                 if (tmp < 0)
1597                         break;
1598                 if (signal_pending(current)) {
1599                         tmp = -ERESTARTSYS;
1600                         break;
1601                 }
1602                 tmp = 0;
1603         }
1604         atomic_dec(&runtime->oss.rw_ref);
1605         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1606 }
1607
1608 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1609 {
1610         struct snd_pcm_substream *substream;
1611         struct snd_pcm_runtime *runtime;
1612         int i;
1613
1614         for (i = 0; i < 2; i++) {
1615                 substream = pcm_oss_file->streams[i];
1616                 if (!substream)
1617                         continue;
1618                 runtime = substream->runtime;
1619                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1620                 mutex_lock(&runtime->oss.params_lock);
1621                 runtime->oss.prepare = 1;
1622                 runtime->oss.buffer_used = 0;
1623                 runtime->oss.prev_hw_ptr_period = 0;
1624                 runtime->oss.period_ptr = 0;
1625                 mutex_unlock(&runtime->oss.params_lock);
1626         }
1627         return 0;
1628 }
1629
1630 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1631 {
1632         struct snd_pcm_substream *substream;
1633         int err;
1634
1635         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1636         if (substream != NULL) {
1637                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1638                         return err;
1639                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1640         }
1641         /* note: all errors from the start action are ignored */
1642         /* OSS apps do not know, how to handle them */
1643         return 0;
1644 }
1645
1646 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1647 {
1648         struct snd_pcm_runtime *runtime;
1649         ssize_t result = 0;
1650         snd_pcm_state_t state;
1651         long res;
1652         wait_queue_t wait;
1653
1654         runtime = substream->runtime;
1655         init_waitqueue_entry(&wait, current);
1656         add_wait_queue(&runtime->sleep, &wait);
1657 #ifdef OSS_DEBUG
1658         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1659 #endif
1660         while (1) {
1661                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1662                 if (result > 0) {
1663                         runtime->oss.buffer_used = 0;
1664                         result = 0;
1665                         break;
1666                 }
1667                 if (result != 0 && result != -EAGAIN)
1668                         break;
1669                 result = 0;
1670                 set_current_state(TASK_INTERRUPTIBLE);
1671                 snd_pcm_stream_lock_irq(substream);
1672                 state = runtime->status->state;
1673                 snd_pcm_stream_unlock_irq(substream);
1674                 if (state != SNDRV_PCM_STATE_RUNNING) {
1675                         set_current_state(TASK_RUNNING);
1676                         break;
1677                 }
1678                 res = schedule_timeout(10 * HZ);
1679                 if (signal_pending(current)) {
1680                         result = -ERESTARTSYS;
1681                         break;
1682                 }
1683                 if (res == 0) {
1684                         pcm_err(substream->pcm,
1685                                 "OSS sync error - DMA timeout\n");
1686                         result = -EIO;
1687                         break;
1688                 }
1689         }
1690         remove_wait_queue(&runtime->sleep, &wait);
1691         return result;
1692 }
1693
1694 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1695 {
1696         int err = 0;
1697         unsigned int saved_f_flags;
1698         struct snd_pcm_substream *substream;
1699         struct snd_pcm_runtime *runtime;
1700         snd_pcm_format_t format;
1701         unsigned long width;
1702         size_t size;
1703
1704         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1705         if (substream != NULL) {
1706                 runtime = substream->runtime;
1707                 if (atomic_read(&substream->mmap_count))
1708                         goto __direct;
1709                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1710                         return err;
1711                 atomic_inc(&runtime->oss.rw_ref);
1712                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1713                         atomic_dec(&runtime->oss.rw_ref);
1714                         return -ERESTARTSYS;
1715                 }
1716                 format = snd_pcm_oss_format_from(runtime->oss.format);
1717                 width = snd_pcm_format_physical_width(format);
1718                 if (runtime->oss.buffer_used > 0) {
1719 #ifdef OSS_DEBUG
1720                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1721 #endif
1722                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1723                         snd_pcm_format_set_silence(format,
1724                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1725                                                    size);
1726                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1727                         if (err < 0)
1728                                 goto unlock;
1729                 } else if (runtime->oss.period_ptr > 0) {
1730 #ifdef OSS_DEBUG
1731                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1732 #endif
1733                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1734                         snd_pcm_format_set_silence(format,
1735                                                    runtime->oss.buffer,
1736                                                    size * 8 / width);
1737                         err = snd_pcm_oss_sync1(substream, size);
1738                         if (err < 0)
1739                                 goto unlock;
1740                 }
1741                 /*
1742                  * The ALSA's period might be a bit large than OSS one.
1743                  * Fill the remain portion of ALSA period with zeros.
1744                  */
1745                 size = runtime->control->appl_ptr % runtime->period_size;
1746                 if (size > 0) {
1747                         size = runtime->period_size - size;
1748                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
1749                                 size = (runtime->frame_bits * size) / 8;
1750                                 while (size > 0) {
1751                                         mm_segment_t fs;
1752                                         size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
1753                                         size -= size1;
1754                                         size1 *= 8;
1755                                         size1 /= runtime->sample_bits;
1756                                         snd_pcm_format_set_silence(runtime->format,
1757                                                                    runtime->oss.buffer,
1758                                                                    size1);
1759                                         size1 /= runtime->channels; /* frames */
1760                                         fs = snd_enter_user();
1761                                         snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
1762                                         snd_leave_user(fs);
1763                                 }
1764                         } else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
1765                                 void __user *buffers[runtime->channels];
1766                                 memset(buffers, 0, runtime->channels * sizeof(void *));
1767                                 snd_pcm_lib_writev(substream, buffers, size);
1768                         }
1769                 }
1770 unlock:
1771                 mutex_unlock(&runtime->oss.params_lock);
1772                 atomic_dec(&runtime->oss.rw_ref);
1773                 if (err < 0)
1774                         return err;
1775                 /*
1776                  * finish sync: drain the buffer
1777                  */
1778               __direct:
1779                 saved_f_flags = substream->f_flags;
1780                 substream->f_flags &= ~O_NONBLOCK;
1781                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1782                 substream->f_flags = saved_f_flags;
1783                 if (err < 0)
1784                         return err;
1785                 mutex_lock(&runtime->oss.params_lock);
1786                 runtime->oss.prepare = 1;
1787                 mutex_unlock(&runtime->oss.params_lock);
1788         }
1789
1790         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1791         if (substream != NULL) {
1792                 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1793                         return err;
1794                 runtime = substream->runtime;
1795                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1796                 if (err < 0)
1797                         return err;
1798                 mutex_lock(&runtime->oss.params_lock);
1799                 runtime->oss.buffer_used = 0;
1800                 runtime->oss.prepare = 1;
1801                 mutex_unlock(&runtime->oss.params_lock);
1802         }
1803         return 0;
1804 }
1805
1806 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1807 {
1808         int idx;
1809
1810         for (idx = 1; idx >= 0; --idx) {
1811                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1812                 struct snd_pcm_runtime *runtime;
1813                 int err;
1814
1815                 if (substream == NULL)
1816                         continue;
1817                 runtime = substream->runtime;
1818                 if (rate < 1000)
1819                         rate = 1000;
1820                 else if (rate > 192000)
1821                         rate = 192000;
1822                 err = lock_params(runtime);
1823                 if (err < 0)
1824                         return err;
1825                 if (runtime->oss.rate != rate) {
1826                         runtime->oss.params = 1;
1827                         runtime->oss.rate = rate;
1828                 }
1829                 unlock_params(runtime);
1830         }
1831         return snd_pcm_oss_get_rate(pcm_oss_file);
1832 }
1833
1834 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1835 {
1836         struct snd_pcm_substream *substream;
1837         int err;
1838
1839         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1840                 return err;
1841         return substream->runtime->oss.rate;
1842 }
1843
1844 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1845 {
1846         int idx;
1847         if (channels < 1)
1848                 channels = 1;
1849         if (channels > 128)
1850                 return -EINVAL;
1851         for (idx = 1; idx >= 0; --idx) {
1852                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1853                 struct snd_pcm_runtime *runtime;
1854                 int err;
1855
1856                 if (substream == NULL)
1857                         continue;
1858                 runtime = substream->runtime;
1859                 err = lock_params(runtime);
1860                 if (err < 0)
1861                         return err;
1862                 if (runtime->oss.channels != channels) {
1863                         runtime->oss.params = 1;
1864                         runtime->oss.channels = channels;
1865                 }
1866                 unlock_params(runtime);
1867         }
1868         return snd_pcm_oss_get_channels(pcm_oss_file);
1869 }
1870
1871 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1872 {
1873         struct snd_pcm_substream *substream;
1874         int err;
1875
1876         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1877                 return err;
1878         return substream->runtime->oss.channels;
1879 }
1880
1881 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1882 {
1883         struct snd_pcm_substream *substream;
1884         int err;
1885
1886         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1887                 return err;
1888         return substream->runtime->oss.period_bytes;
1889 }
1890
1891 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1892 {
1893         struct snd_pcm_substream *substream;
1894         int err;
1895         int direct;
1896         struct snd_pcm_hw_params *params;
1897         unsigned int formats = 0;
1898         struct snd_mask format_mask;
1899         int fmt;
1900
1901         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1902                 return err;
1903         if (atomic_read(&substream->mmap_count))
1904                 direct = 1;
1905         else
1906                 direct = substream->oss.setup.direct;
1907         if (!direct)
1908                 return AFMT_MU_LAW | AFMT_U8 |
1909                        AFMT_S16_LE | AFMT_S16_BE |
1910                        AFMT_S8 | AFMT_U16_LE |
1911                        AFMT_U16_BE |
1912                         AFMT_S32_LE | AFMT_S32_BE |
1913                         AFMT_S24_LE | AFMT_S24_BE |
1914                         AFMT_S24_PACKED;
1915         params = kmalloc(sizeof(*params), GFP_KERNEL);
1916         if (!params)
1917                 return -ENOMEM;
1918         _snd_pcm_hw_params_any(params);
1919         err = snd_pcm_hw_refine(substream, params);
1920         if (err < 0)
1921                 goto error;
1922         format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1923         for (fmt = 0; fmt < 32; ++fmt) {
1924                 if (snd_mask_test(&format_mask, fmt)) {
1925                         int f = snd_pcm_oss_format_to(fmt);
1926                         if (f >= 0)
1927                                 formats |= f;
1928                 }
1929         }
1930
1931  error:
1932         kfree(params);
1933         return err < 0 ? err : formats;
1934 }
1935
1936 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1937 {
1938         int formats, idx;
1939         int err;
1940
1941         if (format != AFMT_QUERY) {
1942                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1943                 if (formats < 0)
1944                         return formats;
1945                 if (!(formats & format))
1946                         format = AFMT_U8;
1947                 for (idx = 1; idx >= 0; --idx) {
1948                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1949                         struct snd_pcm_runtime *runtime;
1950                         if (substream == NULL)
1951                                 continue;
1952                         runtime = substream->runtime;
1953                         err = lock_params(runtime);
1954                         if (err < 0)
1955                                 return err;
1956                         if (runtime->oss.format != format) {
1957                                 runtime->oss.params = 1;
1958                                 runtime->oss.format = format;
1959                         }
1960                         unlock_params(runtime);
1961                 }
1962         }
1963         return snd_pcm_oss_get_format(pcm_oss_file);
1964 }
1965
1966 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1967 {
1968         struct snd_pcm_substream *substream;
1969         int err;
1970
1971         if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1972                 return err;
1973         return substream->runtime->oss.format;
1974 }
1975
1976 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1977 {
1978         struct snd_pcm_runtime *runtime;
1979
1980         runtime = substream->runtime;
1981         if (subdivide == 0) {
1982                 subdivide = runtime->oss.subdivision;
1983                 if (subdivide == 0)
1984                         subdivide = 1;
1985                 return subdivide;
1986         }
1987         if (runtime->oss.subdivision || runtime->oss.fragshift)
1988                 return -EINVAL;
1989         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1990             subdivide != 8 && subdivide != 16)
1991                 return -EINVAL;
1992         runtime->oss.subdivision = subdivide;
1993         runtime->oss.params = 1;
1994         return subdivide;
1995 }
1996
1997 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1998 {
1999         int err = -EINVAL, idx;
2000
2001         for (idx = 1; idx >= 0; --idx) {
2002                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2003                 struct snd_pcm_runtime *runtime;
2004
2005                 if (substream == NULL)
2006                         continue;
2007                 runtime = substream->runtime;
2008                 err = lock_params(runtime);
2009                 if (err < 0)
2010                         return err;
2011                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
2012                 unlock_params(runtime);
2013                 if (err < 0)
2014                         return err;
2015         }
2016         return err;
2017 }
2018
2019 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
2020 {
2021         struct snd_pcm_runtime *runtime;
2022         int fragshift;
2023
2024         runtime = substream->runtime;
2025         if (runtime->oss.subdivision || runtime->oss.fragshift)
2026                 return -EINVAL;
2027         fragshift = val & 0xffff;
2028         if (fragshift >= 25) /* should be large enough */
2029                 return -EINVAL;
2030         runtime->oss.fragshift = fragshift;
2031         runtime->oss.maxfrags = (val >> 16) & 0xffff;
2032         if (runtime->oss.fragshift < 4)         /* < 16 */
2033                 runtime->oss.fragshift = 4;
2034         if (runtime->oss.maxfrags < 2)
2035                 runtime->oss.maxfrags = 2;
2036         runtime->oss.params = 1;
2037         return 0;
2038 }
2039
2040 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
2041 {
2042         int err = -EINVAL, idx;
2043
2044         for (idx = 1; idx >= 0; --idx) {
2045                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2046                 struct snd_pcm_runtime *runtime;
2047
2048                 if (substream == NULL)
2049                         continue;
2050                 runtime = substream->runtime;
2051                 err = lock_params(runtime);
2052                 if (err < 0)
2053                         return err;
2054                 err = snd_pcm_oss_set_fragment1(substream, val);
2055                 unlock_params(runtime);
2056                 if (err < 0)
2057                         return err;
2058         }
2059         return err;
2060 }
2061
2062 static int snd_pcm_oss_nonblock(struct file * file)
2063 {
2064         spin_lock(&file->f_lock);
2065         file->f_flags |= O_NONBLOCK;
2066         spin_unlock(&file->f_lock);
2067         return 0;
2068 }
2069
2070 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2071 {
2072
2073         if (substream == NULL) {
2074                 res &= ~DSP_CAP_DUPLEX;
2075                 return res;
2076         }
2077 #ifdef DSP_CAP_MULTI
2078         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2079                 if (substream->pstr->substream_count > 1)
2080                         res |= DSP_CAP_MULTI;
2081 #endif
2082         /* DSP_CAP_REALTIME is set all times: */
2083         /* all ALSA drivers can return actual pointer in ring buffer */
2084 #if defined(DSP_CAP_REALTIME) && 0
2085         {
2086                 struct snd_pcm_runtime *runtime = substream->runtime;
2087                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2088                         res &= ~DSP_CAP_REALTIME;
2089         }
2090 #endif
2091         return res;
2092 }
2093
2094 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2095 {
2096         int result, idx;
2097
2098         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2099         for (idx = 0; idx < 2; idx++) {
2100                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2101                 result = snd_pcm_oss_get_caps1(substream, result);
2102         }
2103         result |= 0x0001;       /* revision - same as SB AWE 64 */
2104         return result;
2105 }
2106
2107 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2108                                       snd_pcm_uframes_t hw_ptr)
2109 {
2110         struct snd_pcm_runtime *runtime = substream->runtime;
2111         snd_pcm_uframes_t appl_ptr;
2112         appl_ptr = hw_ptr + runtime->buffer_size;
2113         appl_ptr %= runtime->boundary;
2114         runtime->control->appl_ptr = appl_ptr;
2115 }
2116
2117 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2118 {
2119         struct snd_pcm_runtime *runtime;
2120         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2121         int err, cmd;
2122
2123 #ifdef OSS_DEBUG
2124         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2125 #endif
2126
2127         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2128         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2129
2130         if (psubstream) {
2131                 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2132                         return err;
2133         }
2134         if (csubstream) {
2135                 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2136                         return err;
2137         }
2138         if (psubstream) {
2139                 runtime = psubstream->runtime;
2140                 cmd = 0;
2141                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2142                         return -ERESTARTSYS;
2143                 if (trigger & PCM_ENABLE_OUTPUT) {
2144                         if (runtime->oss.trigger)
2145                                 goto _skip1;
2146                         if (atomic_read(&psubstream->mmap_count))
2147                                 snd_pcm_oss_simulate_fill(psubstream,
2148                                                 get_hw_ptr_period(runtime));
2149                         runtime->oss.trigger = 1;
2150                         runtime->start_threshold = 1;
2151                         cmd = SNDRV_PCM_IOCTL_START;
2152                 } else {
2153                         if (!runtime->oss.trigger)
2154                                 goto _skip1;
2155                         runtime->oss.trigger = 0;
2156                         runtime->start_threshold = runtime->boundary;
2157                         cmd = SNDRV_PCM_IOCTL_DROP;
2158                         runtime->oss.prepare = 1;
2159                 }
2160  _skip1:
2161                 mutex_unlock(&runtime->oss.params_lock);
2162                 if (cmd) {
2163                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2164                         if (err < 0)
2165                                 return err;
2166                 }
2167         }
2168         if (csubstream) {
2169                 runtime = csubstream->runtime;
2170                 cmd = 0;
2171                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2172                         return -ERESTARTSYS;
2173                 if (trigger & PCM_ENABLE_INPUT) {
2174                         if (runtime->oss.trigger)
2175                                 goto _skip2;
2176                         runtime->oss.trigger = 1;
2177                         runtime->start_threshold = 1;
2178                         cmd = SNDRV_PCM_IOCTL_START;
2179                 } else {
2180                         if (!runtime->oss.trigger)
2181                                 goto _skip2;
2182                         runtime->oss.trigger = 0;
2183                         runtime->start_threshold = runtime->boundary;
2184                         cmd = SNDRV_PCM_IOCTL_DROP;
2185                         runtime->oss.prepare = 1;
2186                 }
2187  _skip2:
2188                 mutex_unlock(&runtime->oss.params_lock);
2189                 if (cmd) {
2190                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2191                         if (err < 0)
2192                                 return err;
2193                 }
2194         }
2195         return 0;
2196 }
2197
2198 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2199 {
2200         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2201         int result = 0;
2202
2203         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2204         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2205         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2206                 result |= PCM_ENABLE_OUTPUT;
2207         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2208                 result |= PCM_ENABLE_INPUT;
2209         return result;
2210 }
2211
2212 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2213 {
2214         struct snd_pcm_substream *substream;
2215         struct snd_pcm_runtime *runtime;
2216         snd_pcm_sframes_t delay;
2217         int err;
2218
2219         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2220         if (substream == NULL)
2221                 return -EINVAL;
2222         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2223                 return err;
2224         runtime = substream->runtime;
2225         if (runtime->oss.params || runtime->oss.prepare)
2226                 return 0;
2227         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2228         if (err == -EPIPE)
2229                 delay = 0;      /* hack for broken OSS applications */
2230         else if (err < 0)
2231                 return err;
2232         return snd_pcm_oss_bytes(substream, delay);
2233 }
2234
2235 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2236 {
2237         struct snd_pcm_substream *substream;
2238         struct snd_pcm_runtime *runtime;
2239         snd_pcm_sframes_t delay;
2240         int fixup;
2241         struct count_info info;
2242         int err;
2243
2244         if (_info == NULL)
2245                 return -EFAULT;
2246         substream = pcm_oss_file->streams[stream];
2247         if (substream == NULL)
2248                 return -EINVAL;
2249         if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2250                 return err;
2251         runtime = substream->runtime;
2252         if (runtime->oss.params || runtime->oss.prepare) {
2253                 memset(&info, 0, sizeof(info));
2254                 if (copy_to_user(_info, &info, sizeof(info)))
2255                         return -EFAULT;
2256                 return 0;
2257         }
2258         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2259                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2260                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2261                         err = 0;
2262                         delay = 0;
2263                         fixup = 0;
2264                 } else {
2265                         fixup = runtime->oss.buffer_used;
2266                 }
2267         } else {
2268                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2269                 fixup = -runtime->oss.buffer_used;
2270         }
2271         if (err < 0)
2272                 return err;
2273         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2274         if (atomic_read(&substream->mmap_count)) {
2275                 snd_pcm_sframes_t n;
2276                 delay = get_hw_ptr_period(runtime);
2277                 n = delay - runtime->oss.prev_hw_ptr_period;
2278                 if (n < 0)
2279                         n += runtime->boundary;
2280                 info.blocks = n / runtime->period_size;
2281                 runtime->oss.prev_hw_ptr_period = delay;
2282                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2283                         snd_pcm_oss_simulate_fill(substream, delay);
2284                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2285         } else {
2286                 delay = snd_pcm_oss_bytes(substream, delay);
2287                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2288                         if (substream->oss.setup.buggyptr)
2289                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2290                         else
2291                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2292                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2293                 } else {
2294                         delay += fixup;
2295                         info.blocks = delay / runtime->oss.period_bytes;
2296                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2297                 }
2298         }
2299         if (copy_to_user(_info, &info, sizeof(info)))
2300                 return -EFAULT;
2301         return 0;
2302 }
2303
2304 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2305 {
2306         struct snd_pcm_substream *substream;
2307         struct snd_pcm_runtime *runtime;
2308         snd_pcm_sframes_t avail;
2309         int fixup;
2310         struct audio_buf_info info;
2311         int err;
2312
2313         if (_info == NULL)
2314                 return -EFAULT;
2315         substream = pcm_oss_file->streams[stream];
2316         if (substream == NULL)
2317                 return -EINVAL;
2318         runtime = substream->runtime;
2319
2320         if (runtime->oss.params &&
2321             (err = snd_pcm_oss_change_params(substream, false)) < 0)
2322                 return err;
2323
2324         info.fragsize = runtime->oss.period_bytes;
2325         info.fragstotal = runtime->periods;
2326         if (runtime->oss.prepare) {
2327                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2328                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2329                         info.fragments = runtime->oss.periods;
2330                 } else {
2331                         info.bytes = 0;
2332                         info.fragments = 0;
2333                 }
2334         } else {
2335                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2336                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2337                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2338                                 avail = runtime->buffer_size;
2339                                 err = 0;
2340                                 fixup = 0;
2341                         } else {
2342                                 avail = runtime->buffer_size - avail;
2343                                 fixup = -runtime->oss.buffer_used;
2344                         }
2345                 } else {
2346                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2347                         fixup = runtime->oss.buffer_used;
2348                 }
2349                 if (err < 0)
2350                         return err;
2351                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2352                 info.fragments = info.bytes / runtime->oss.period_bytes;
2353         }
2354
2355 #ifdef OSS_DEBUG
2356         pcm_dbg(substream->pcm,
2357                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2358                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2359 #endif
2360         if (copy_to_user(_info, &info, sizeof(info)))
2361                 return -EFAULT;
2362         return 0;
2363 }
2364
2365 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2366 {
2367         // it won't be probably implemented
2368         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2369         return -EINVAL;
2370 }
2371
2372 static const char *strip_task_path(const char *path)
2373 {
2374         const char *ptr, *ptrl = NULL;
2375         for (ptr = path; *ptr; ptr++) {
2376                 if (*ptr == '/')
2377                         ptrl = ptr + 1;
2378         }
2379         return ptrl;
2380 }
2381
2382 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2383                                       const char *task_name,
2384                                       struct snd_pcm_oss_setup *rsetup)
2385 {
2386         struct snd_pcm_oss_setup *setup;
2387
2388         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2389         do {
2390                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2391                      setup = setup->next) {
2392                         if (!strcmp(setup->task_name, task_name))
2393                                 goto out;
2394                 }
2395         } while ((task_name = strip_task_path(task_name)) != NULL);
2396  out:
2397         if (setup)
2398                 *rsetup = *setup;
2399         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2400 }
2401
2402 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2403 {
2404         struct snd_pcm_runtime *runtime;
2405         runtime = substream->runtime;
2406         vfree(runtime->oss.buffer);
2407         runtime->oss.buffer = NULL;
2408 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2409         snd_pcm_oss_plugin_clear(substream);
2410 #endif
2411         substream->oss.oss = 0;
2412 }
2413
2414 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2415                                        struct snd_pcm_oss_setup *setup,
2416                                        int minor)
2417 {
2418         struct snd_pcm_runtime *runtime;
2419
2420         substream->oss.oss = 1;
2421         substream->oss.setup = *setup;
2422         if (setup->nonblock)
2423                 substream->f_flags |= O_NONBLOCK;
2424         else if (setup->block)
2425                 substream->f_flags &= ~O_NONBLOCK;
2426         runtime = substream->runtime;
2427         runtime->oss.params = 1;
2428         runtime->oss.trigger = 1;
2429         runtime->oss.rate = 8000;
2430         mutex_init(&runtime->oss.params_lock);
2431         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2432         case SNDRV_MINOR_OSS_PCM_8:
2433                 runtime->oss.format = AFMT_U8;
2434                 break;
2435         case SNDRV_MINOR_OSS_PCM_16:
2436                 runtime->oss.format = AFMT_S16_LE;
2437                 break;
2438         default:
2439                 runtime->oss.format = AFMT_MU_LAW;
2440         }
2441         runtime->oss.channels = 1;
2442         runtime->oss.fragshift = 0;
2443         runtime->oss.maxfrags = 0;
2444         runtime->oss.subdivision = 0;
2445         substream->pcm_release = snd_pcm_oss_release_substream;
2446         atomic_set(&runtime->oss.rw_ref, 0);
2447 }
2448
2449 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2450 {
2451         int cidx;
2452         if (!pcm_oss_file)
2453                 return 0;
2454         for (cidx = 0; cidx < 2; ++cidx) {
2455                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2456                 if (substream)
2457                         snd_pcm_release_substream(substream);
2458         }
2459         kfree(pcm_oss_file);
2460         return 0;
2461 }
2462
2463 static int snd_pcm_oss_open_file(struct file *file,
2464                                  struct snd_pcm *pcm,
2465                                  struct snd_pcm_oss_file **rpcm_oss_file,
2466                                  int minor,
2467                                  struct snd_pcm_oss_setup *setup)
2468 {
2469         int idx, err;
2470         struct snd_pcm_oss_file *pcm_oss_file;
2471         struct snd_pcm_substream *substream;
2472         fmode_t f_mode = file->f_mode;
2473
2474         if (rpcm_oss_file)
2475                 *rpcm_oss_file = NULL;
2476
2477         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2478         if (pcm_oss_file == NULL)
2479                 return -ENOMEM;
2480
2481         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2482             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2483                 f_mode = FMODE_WRITE;
2484
2485         file->f_flags &= ~O_APPEND;
2486         for (idx = 0; idx < 2; idx++) {
2487                 if (setup[idx].disable)
2488                         continue;
2489                 if (! pcm->streams[idx].substream_count)
2490                         continue; /* no matching substream */
2491                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2492                         if (! (f_mode & FMODE_WRITE))
2493                                 continue;
2494                 } else {
2495                         if (! (f_mode & FMODE_READ))
2496                                 continue;
2497                 }
2498                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2499                 if (err < 0) {
2500                         snd_pcm_oss_release_file(pcm_oss_file);
2501                         return err;
2502                 }
2503
2504                 pcm_oss_file->streams[idx] = substream;
2505                 substream->file = pcm_oss_file;
2506                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2507         }
2508
2509         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2510                 snd_pcm_oss_release_file(pcm_oss_file);
2511                 return -EINVAL;
2512         }
2513
2514         file->private_data = pcm_oss_file;
2515         if (rpcm_oss_file)
2516                 *rpcm_oss_file = pcm_oss_file;
2517         return 0;
2518 }
2519
2520
2521 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2522 {
2523         unsigned int idx;
2524
2525         if (snd_BUG_ON(!task || !name || size < 2))
2526                 return -EINVAL;
2527         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2528                 name[idx] = task->comm[idx];
2529         name[idx] = '\0';
2530         return 0;
2531 }
2532
2533 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2534 {
2535         int err;
2536         char task_name[32];
2537         struct snd_pcm *pcm;
2538         struct snd_pcm_oss_file *pcm_oss_file;
2539         struct snd_pcm_oss_setup setup[2];
2540         int nonblock;
2541         wait_queue_t wait;
2542
2543         err = nonseekable_open(inode, file);
2544         if (err < 0)
2545                 return err;
2546
2547         pcm = snd_lookup_oss_minor_data(iminor(inode),
2548                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2549         if (pcm == NULL) {
2550                 err = -ENODEV;
2551                 goto __error1;
2552         }
2553         err = snd_card_file_add(pcm->card, file);
2554         if (err < 0)
2555                 goto __error1;
2556         if (!try_module_get(pcm->card->module)) {
2557                 err = -EFAULT;
2558                 goto __error2;
2559         }
2560         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2561                 err = -EFAULT;
2562                 goto __error;
2563         }
2564         memset(setup, 0, sizeof(setup));
2565         if (file->f_mode & FMODE_WRITE)
2566                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2567                                            task_name, &setup[0]);
2568         if (file->f_mode & FMODE_READ)
2569                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2570                                            task_name, &setup[1]);
2571
2572         nonblock = !!(file->f_flags & O_NONBLOCK);
2573         if (!nonblock)
2574                 nonblock = nonblock_open;
2575
2576         init_waitqueue_entry(&wait, current);
2577         add_wait_queue(&pcm->open_wait, &wait);
2578         mutex_lock(&pcm->open_mutex);
2579         while (1) {
2580                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2581                                             iminor(inode), setup);
2582                 if (err >= 0)
2583                         break;
2584                 if (err == -EAGAIN) {
2585                         if (nonblock) {
2586                                 err = -EBUSY;
2587                                 break;
2588                         }
2589                 } else
2590                         break;
2591                 set_current_state(TASK_INTERRUPTIBLE);
2592                 mutex_unlock(&pcm->open_mutex);
2593                 schedule();
2594                 mutex_lock(&pcm->open_mutex);
2595                 if (pcm->card->shutdown) {
2596                         err = -ENODEV;
2597                         break;
2598                 }
2599                 if (signal_pending(current)) {
2600                         err = -ERESTARTSYS;
2601                         break;
2602                 }
2603         }
2604         remove_wait_queue(&pcm->open_wait, &wait);
2605         mutex_unlock(&pcm->open_mutex);
2606         if (err < 0)
2607                 goto __error;
2608         snd_card_unref(pcm->card);
2609         return err;
2610
2611       __error:
2612         module_put(pcm->card->module);
2613       __error2:
2614         snd_card_file_remove(pcm->card, file);
2615       __error1:
2616         if (pcm)
2617                 snd_card_unref(pcm->card);
2618         return err;
2619 }
2620
2621 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2622 {
2623         struct snd_pcm *pcm;
2624         struct snd_pcm_substream *substream;
2625         struct snd_pcm_oss_file *pcm_oss_file;
2626
2627         pcm_oss_file = file->private_data;
2628         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2629         if (substream == NULL)
2630                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2631         if (snd_BUG_ON(!substream))
2632                 return -ENXIO;
2633         pcm = substream->pcm;
2634         if (!pcm->card->shutdown)
2635                 snd_pcm_oss_sync(pcm_oss_file);
2636         mutex_lock(&pcm->open_mutex);
2637         snd_pcm_oss_release_file(pcm_oss_file);
2638         mutex_unlock(&pcm->open_mutex);
2639         wake_up(&pcm->open_wait);
2640         module_put(pcm->card->module);
2641         snd_card_file_remove(pcm->card, file);
2642         return 0;
2643 }
2644
2645 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2646 {
2647         struct snd_pcm_oss_file *pcm_oss_file;
2648         int __user *p = (int __user *)arg;
2649         int res;
2650
2651         pcm_oss_file = file->private_data;
2652         if (cmd == OSS_GETVERSION)
2653                 return put_user(SNDRV_OSS_VERSION, p);
2654         if (cmd == OSS_ALSAEMULVER)
2655                 return put_user(1, p);
2656 #if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
2657         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2658                 struct snd_pcm_substream *substream;
2659                 int idx;
2660                 for (idx = 0; idx < 2; ++idx) {
2661                         substream = pcm_oss_file->streams[idx];
2662                         if (substream != NULL)
2663                                 break;
2664                 }
2665                 if (snd_BUG_ON(idx >= 2))
2666                         return -ENXIO;
2667                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2668         }
2669 #endif
2670         if (((cmd >> 8) & 0xff) != 'P')
2671                 return -EINVAL;
2672 #ifdef OSS_DEBUG
2673         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2674 #endif
2675         switch (cmd) {
2676         case SNDCTL_DSP_RESET:
2677                 return snd_pcm_oss_reset(pcm_oss_file);
2678         case SNDCTL_DSP_SYNC:
2679                 return snd_pcm_oss_sync(pcm_oss_file);
2680         case SNDCTL_DSP_SPEED:
2681                 if (get_user(res, p))
2682                         return -EFAULT;
2683                 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2684                         return res;
2685                 return put_user(res, p);
2686         case SOUND_PCM_READ_RATE:
2687                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2688                 if (res < 0)
2689                         return res;
2690                 return put_user(res, p);
2691         case SNDCTL_DSP_STEREO:
2692                 if (get_user(res, p))
2693                         return -EFAULT;
2694                 res = res > 0 ? 2 : 1;
2695                 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2696                         return res;
2697                 return put_user(--res, p);
2698         case SNDCTL_DSP_GETBLKSIZE:
2699                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2700                 if (res < 0)
2701                         return res;
2702                 return put_user(res, p);
2703         case SNDCTL_DSP_SETFMT:
2704                 if (get_user(res, p))
2705                         return -EFAULT;
2706                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2707                 if (res < 0)
2708                         return res;
2709                 return put_user(res, p);
2710         case SOUND_PCM_READ_BITS:
2711                 res = snd_pcm_oss_get_format(pcm_oss_file);
2712                 if (res < 0)
2713                         return res;
2714                 return put_user(res, p);
2715         case SNDCTL_DSP_CHANNELS:
2716                 if (get_user(res, p))
2717                         return -EFAULT;
2718                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2719                 if (res < 0)
2720                         return res;
2721                 return put_user(res, p);
2722         case SOUND_PCM_READ_CHANNELS:
2723                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2724                 if (res < 0)
2725                         return res;
2726                 return put_user(res, p);
2727         case SOUND_PCM_WRITE_FILTER:
2728         case SOUND_PCM_READ_FILTER:
2729                 return -EIO;
2730         case SNDCTL_DSP_POST:
2731                 return snd_pcm_oss_post(pcm_oss_file);
2732         case SNDCTL_DSP_SUBDIVIDE:
2733                 if (get_user(res, p))
2734                         return -EFAULT;
2735                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2736                 if (res < 0)
2737                         return res;
2738                 return put_user(res, p);
2739         case SNDCTL_DSP_SETFRAGMENT:
2740                 if (get_user(res, p))
2741                         return -EFAULT;
2742                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2743         case SNDCTL_DSP_GETFMTS:
2744                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2745                 if (res < 0)
2746                         return res;
2747                 return put_user(res, p);
2748         case SNDCTL_DSP_GETOSPACE:
2749         case SNDCTL_DSP_GETISPACE:
2750                 return snd_pcm_oss_get_space(pcm_oss_file,
2751                         cmd == SNDCTL_DSP_GETISPACE ?
2752                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2753                         (struct audio_buf_info __user *) arg);
2754         case SNDCTL_DSP_NONBLOCK:
2755                 return snd_pcm_oss_nonblock(file);
2756         case SNDCTL_DSP_GETCAPS:
2757                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2758                 if (res < 0)
2759                         return res;
2760                 return put_user(res, p);
2761         case SNDCTL_DSP_GETTRIGGER:
2762                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2763                 if (res < 0)
2764                         return res;
2765                 return put_user(res, p);
2766         case SNDCTL_DSP_SETTRIGGER:
2767                 if (get_user(res, p))
2768                         return -EFAULT;
2769                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2770         case SNDCTL_DSP_GETIPTR:
2771         case SNDCTL_DSP_GETOPTR:
2772                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2773                         cmd == SNDCTL_DSP_GETIPTR ?
2774                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2775                         (struct count_info __user *) arg);
2776         case SNDCTL_DSP_MAPINBUF:
2777         case SNDCTL_DSP_MAPOUTBUF:
2778                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2779                         cmd == SNDCTL_DSP_MAPINBUF ?
2780                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2781                         (struct buffmem_desc __user *) arg);
2782         case SNDCTL_DSP_SETSYNCRO:
2783                 /* stop DMA now.. */
2784                 return 0;
2785         case SNDCTL_DSP_SETDUPLEX:
2786                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2787                         return 0;
2788                 return -EIO;
2789         case SNDCTL_DSP_GETODELAY:
2790                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2791                 if (res < 0) {
2792                         /* it's for sure, some broken apps don't check for error codes */
2793                         put_user(0, p);
2794                         return res;
2795                 }
2796                 return put_user(res, p);
2797         case SNDCTL_DSP_PROFILE:
2798                 return 0;       /* silently ignore */
2799         default:
2800                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2801         }
2802         return -EINVAL;
2803 }
2804
2805 #ifdef CONFIG_COMPAT
2806 /* all compatible */
2807 #define snd_pcm_oss_ioctl_compat        snd_pcm_oss_ioctl
2808 #else
2809 #define snd_pcm_oss_ioctl_compat        NULL
2810 #endif
2811
2812 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2813 {
2814         struct snd_pcm_oss_file *pcm_oss_file;
2815         struct snd_pcm_substream *substream;
2816
2817         pcm_oss_file = file->private_data;
2818         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2819         if (substream == NULL)
2820                 return -ENXIO;
2821         substream->f_flags = file->f_flags & O_NONBLOCK;
2822 #ifndef OSS_DEBUG
2823         return snd_pcm_oss_read1(substream, buf, count);
2824 #else
2825         {
2826                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2827                 pcm_dbg(substream->pcm,
2828                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2829                         (long)count, (long)res);
2830                 return res;
2831         }
2832 #endif
2833 }
2834
2835 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2836 {
2837         struct snd_pcm_oss_file *pcm_oss_file;
2838         struct snd_pcm_substream *substream;
2839         long result;
2840
2841         pcm_oss_file = file->private_data;
2842         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2843         if (substream == NULL)
2844                 return -ENXIO;
2845         substream->f_flags = file->f_flags & O_NONBLOCK;
2846         result = snd_pcm_oss_write1(substream, buf, count);
2847 #ifdef OSS_DEBUG
2848         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2849                (long)count, (long)result);
2850 #endif
2851         return result;
2852 }
2853
2854 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2855 {
2856         struct snd_pcm_runtime *runtime = substream->runtime;
2857         if (atomic_read(&substream->mmap_count))
2858                 return runtime->oss.prev_hw_ptr_period !=
2859                                                 get_hw_ptr_period(runtime);
2860         else
2861                 return snd_pcm_playback_avail(runtime) >=
2862                                                 runtime->oss.period_frames;
2863 }
2864
2865 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2866 {
2867         struct snd_pcm_runtime *runtime = substream->runtime;
2868         if (atomic_read(&substream->mmap_count))
2869                 return runtime->oss.prev_hw_ptr_period !=
2870                                                 get_hw_ptr_period(runtime);
2871         else
2872                 return snd_pcm_capture_avail(runtime) >=
2873                                                 runtime->oss.period_frames;
2874 }
2875
2876 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
2877 {
2878         struct snd_pcm_oss_file *pcm_oss_file;
2879         unsigned int mask;
2880         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2881
2882         pcm_oss_file = file->private_data;
2883
2884         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2885         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2886
2887         mask = 0;
2888         if (psubstream != NULL) {
2889                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2890                 poll_wait(file, &runtime->sleep, wait);
2891                 snd_pcm_stream_lock_irq(psubstream);
2892                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2893                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2894                      snd_pcm_oss_playback_ready(psubstream)))
2895                         mask |= POLLOUT | POLLWRNORM;
2896                 snd_pcm_stream_unlock_irq(psubstream);
2897         }
2898         if (csubstream != NULL) {
2899                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2900                 snd_pcm_state_t ostate;
2901                 poll_wait(file, &runtime->sleep, wait);
2902                 snd_pcm_stream_lock_irq(csubstream);
2903                 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2904                     snd_pcm_oss_capture_ready(csubstream))
2905                         mask |= POLLIN | POLLRDNORM;
2906                 snd_pcm_stream_unlock_irq(csubstream);
2907                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2908                         struct snd_pcm_oss_file ofile;
2909                         memset(&ofile, 0, sizeof(ofile));
2910                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2911                         runtime->oss.trigger = 0;
2912                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2913                 }
2914         }
2915
2916         return mask;
2917 }
2918
2919 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2920 {
2921         struct snd_pcm_oss_file *pcm_oss_file;
2922         struct snd_pcm_substream *substream = NULL;
2923         struct snd_pcm_runtime *runtime;
2924         int err;
2925
2926 #ifdef OSS_DEBUG
2927         pr_debug("pcm_oss: mmap begin\n");
2928 #endif
2929         pcm_oss_file = file->private_data;
2930         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2931         case VM_READ | VM_WRITE:
2932                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2933                 if (substream)
2934                         break;
2935                 /* Fall through */
2936         case VM_READ:
2937                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2938                 break;
2939         case VM_WRITE:
2940                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2941                 break;
2942         default:
2943                 return -EINVAL;
2944         }
2945         /* set VM_READ access as well to fix memset() routines that do
2946            reads before writes (to improve performance) */
2947         area->vm_flags |= VM_READ;
2948         if (substream == NULL)
2949                 return -ENXIO;
2950         runtime = substream->runtime;
2951         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2952                 return -EIO;
2953         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2954                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2955         else
2956                 return -EIO;
2957
2958         if (runtime->oss.params) {
2959                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2960                  * between mmap_sem and params_lock taken by
2961                  * copy_from/to_user() in snd_pcm_oss_write/read()
2962                  */
2963                 err = snd_pcm_oss_change_params(substream, true);
2964                 if (err < 0)
2965                         return err;
2966         }
2967 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2968         if (runtime->oss.plugin_first != NULL)
2969                 return -EIO;
2970 #endif
2971
2972         if (area->vm_pgoff != 0)
2973                 return -EINVAL;
2974
2975         err = snd_pcm_mmap_data(substream, file, area);
2976         if (err < 0)
2977                 return err;
2978         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2979         runtime->silence_threshold = 0;
2980         runtime->silence_size = 0;
2981 #ifdef OSS_DEBUG
2982         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2983                runtime->oss.mmap_bytes);
2984 #endif
2985         /* In mmap mode we never stop */
2986         runtime->stop_threshold = runtime->boundary;
2987
2988         return 0;
2989 }
2990
2991 #ifdef CONFIG_SND_VERBOSE_PROCFS
2992 /*
2993  *  /proc interface
2994  */
2995
2996 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2997                                   struct snd_info_buffer *buffer)
2998 {
2999         struct snd_pcm_str *pstr = entry->private_data;
3000         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
3001         mutex_lock(&pstr->oss.setup_mutex);
3002         while (setup) {
3003                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
3004                             setup->task_name,
3005                             setup->periods,
3006                             setup->period_size,
3007                             setup->disable ? " disable" : "",
3008                             setup->direct ? " direct" : "",
3009                             setup->block ? " block" : "",
3010                             setup->nonblock ? " non-block" : "",
3011                             setup->partialfrag ? " partial-frag" : "",
3012                             setup->nosilence ? " no-silence" : "");
3013                 setup = setup->next;
3014         }
3015         mutex_unlock(&pstr->oss.setup_mutex);
3016 }
3017
3018 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
3019 {
3020         struct snd_pcm_oss_setup *setup, *setupn;
3021
3022         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
3023              setup; setup = setupn) {
3024                 setupn = setup->next;
3025                 kfree(setup->task_name);
3026                 kfree(setup);
3027         }
3028         pstr->oss.setup_list = NULL;
3029 }
3030
3031 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
3032                                    struct snd_info_buffer *buffer)
3033 {
3034         struct snd_pcm_str *pstr = entry->private_data;
3035         char line[128], str[32], task_name[32];
3036         const char *ptr;
3037         int idx1;
3038         struct snd_pcm_oss_setup *setup, *setup1, template;
3039
3040         while (!snd_info_get_line(buffer, line, sizeof(line))) {
3041                 mutex_lock(&pstr->oss.setup_mutex);
3042                 memset(&template, 0, sizeof(template));
3043                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3044                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3045                         snd_pcm_oss_proc_free_setup_list(pstr);
3046                         mutex_unlock(&pstr->oss.setup_mutex);
3047                         continue;
3048                 }
3049                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3050                         if (!strcmp(setup->task_name, task_name)) {
3051                                 template = *setup;
3052                                 break;
3053                         }
3054                 }
3055                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3056                 template.periods = simple_strtoul(str, NULL, 10);
3057                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3058                 template.period_size = simple_strtoul(str, NULL, 10);
3059                 for (idx1 = 31; idx1 >= 0; idx1--)
3060                         if (template.period_size & (1 << idx1))
3061                                 break;
3062                 for (idx1--; idx1 >= 0; idx1--)
3063                         template.period_size &= ~(1 << idx1);
3064                 do {
3065                         ptr = snd_info_get_str(str, ptr, sizeof(str));
3066                         if (!strcmp(str, "disable")) {
3067                                 template.disable = 1;
3068                         } else if (!strcmp(str, "direct")) {
3069                                 template.direct = 1;
3070                         } else if (!strcmp(str, "block")) {
3071                                 template.block = 1;
3072                         } else if (!strcmp(str, "non-block")) {
3073                                 template.nonblock = 1;
3074                         } else if (!strcmp(str, "partial-frag")) {
3075                                 template.partialfrag = 1;
3076                         } else if (!strcmp(str, "no-silence")) {
3077                                 template.nosilence = 1;
3078                         } else if (!strcmp(str, "buggy-ptr")) {
3079                                 template.buggyptr = 1;
3080                         }
3081                 } while (*str);
3082                 if (setup == NULL) {
3083                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3084                         if (! setup) {
3085                                 buffer->error = -ENOMEM;
3086                                 mutex_unlock(&pstr->oss.setup_mutex);
3087                                 return;
3088                         }
3089                         if (pstr->oss.setup_list == NULL)
3090                                 pstr->oss.setup_list = setup;
3091                         else {
3092                                 for (setup1 = pstr->oss.setup_list;
3093                                      setup1->next; setup1 = setup1->next);
3094                                 setup1->next = setup;
3095                         }
3096                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3097                         if (! template.task_name) {
3098                                 kfree(setup);
3099                                 buffer->error = -ENOMEM;
3100                                 mutex_unlock(&pstr->oss.setup_mutex);
3101                                 return;
3102                         }
3103                 }
3104                 *setup = template;
3105                 mutex_unlock(&pstr->oss.setup_mutex);
3106         }
3107 }
3108
3109 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3110 {
3111         int stream;
3112         for (stream = 0; stream < 2; ++stream) {
3113                 struct snd_info_entry *entry;
3114                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3115                 if (pstr->substream_count == 0)
3116                         continue;
3117                 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3118                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3119                         entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
3120                         entry->c.text.read = snd_pcm_oss_proc_read;
3121                         entry->c.text.write = snd_pcm_oss_proc_write;
3122                         entry->private_data = pstr;
3123                         if (snd_info_register(entry) < 0) {
3124                                 snd_info_free_entry(entry);
3125                                 entry = NULL;
3126                         }
3127                 }
3128                 pstr->oss.proc_entry = entry;
3129         }
3130 }
3131
3132 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3133 {
3134         int stream;
3135         for (stream = 0; stream < 2; ++stream) {
3136                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3137                 snd_info_free_entry(pstr->oss.proc_entry);
3138                 pstr->oss.proc_entry = NULL;
3139                 snd_pcm_oss_proc_free_setup_list(pstr);
3140         }
3141 }
3142 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3143 #define snd_pcm_oss_proc_init(pcm)
3144 #define snd_pcm_oss_proc_done(pcm)
3145 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3146
3147 /*
3148  *  ENTRY functions
3149  */
3150
3151 static const struct file_operations snd_pcm_oss_f_reg =
3152 {
3153         .owner =        THIS_MODULE,
3154         .read =         snd_pcm_oss_read,
3155         .write =        snd_pcm_oss_write,
3156         .open =         snd_pcm_oss_open,
3157         .release =      snd_pcm_oss_release,
3158         .llseek =       no_llseek,
3159         .poll =         snd_pcm_oss_poll,
3160         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3161         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3162         .mmap =         snd_pcm_oss_mmap,
3163 };
3164
3165 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3166 {
3167         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3168                                     pcm->card, index, &snd_pcm_oss_f_reg,
3169                                     pcm) < 0) {
3170                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3171                            pcm->card->number, pcm->device);
3172         }
3173 }
3174
3175 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3176 {
3177         pcm->oss.reg = 0;
3178         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3179                 char name[128];
3180                 int duplex;
3181                 register_oss_dsp(pcm, 0);
3182                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3183                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3184                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3185                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3186 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3187                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3188                                       pcm->card->number,
3189                                       name);
3190 #endif
3191                 pcm->oss.reg++;
3192                 pcm->oss.reg_mask |= 1;
3193         }
3194         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3195                 register_oss_dsp(pcm, 1);
3196                 pcm->oss.reg++;
3197                 pcm->oss.reg_mask |= 2;
3198         }
3199
3200         if (pcm->oss.reg)
3201                 snd_pcm_oss_proc_init(pcm);
3202
3203         return 0;
3204 }
3205
3206 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3207 {
3208         if (pcm->oss.reg) {
3209                 if (pcm->oss.reg_mask & 1) {
3210                         pcm->oss.reg_mask &= ~1;
3211                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3212                                                   pcm->card, 0);
3213                 }
3214                 if (pcm->oss.reg_mask & 2) {
3215                         pcm->oss.reg_mask &= ~2;
3216                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3217                                                   pcm->card, 1);
3218                 }
3219                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3220 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3221                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3222 #endif
3223                 }
3224                 pcm->oss.reg = 0;
3225         }
3226         return 0;
3227 }
3228
3229 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3230 {
3231         snd_pcm_oss_disconnect_minor(pcm);
3232         snd_pcm_oss_proc_done(pcm);
3233         return 0;
3234 }
3235
3236 static struct snd_pcm_notify snd_pcm_oss_notify =
3237 {
3238         .n_register =   snd_pcm_oss_register_minor,
3239         .n_disconnect = snd_pcm_oss_disconnect_minor,
3240         .n_unregister = snd_pcm_oss_unregister_minor,
3241 };
3242
3243 static int __init alsa_pcm_oss_init(void)
3244 {
3245         int i;
3246         int err;
3247
3248         /* check device map table */
3249         for (i = 0; i < SNDRV_CARDS; i++) {
3250                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3251                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3252                                    i, dsp_map[i]);
3253                         dsp_map[i] = 0;
3254                 }
3255                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3256                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3257                                    i, adsp_map[i]);
3258                         adsp_map[i] = 1;
3259                 }
3260         }
3261         if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3262                 return err;
3263         return 0;
3264 }
3265
3266 static void __exit alsa_pcm_oss_exit(void)
3267 {
3268         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3269 }
3270
3271 module_init(alsa_pcm_oss_init)
3272 module_exit(alsa_pcm_oss_exit)