sound/pci/ac97/ac97_pcm.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   3  *  Universal interface for Audio Codec '97
   4  *
   5  *  For more details look to AC '97 component specification revision 2.2
   6  *  by Intel Corporation (http://developer.intel.com) and to datasheets
   7  *  for specific codecs.
   8  *
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  */
  25
  26 #include <sound/driver.h>
  27 #include <linux/delay.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <sound/core.h>
  31 #include <sound/pcm.h>
  32 #include <sound/control.h>
  33 #include <sound/ac97_codec.h>
  34 #include <sound/asoundef.h>
  35 #include "ac97_patch.h"
  36 #include "ac97_id.h"
  37 #include "ac97_local.h"
  38
  39 /*
  40  *  PCM support
  41  */
  42
  43 static unsigned char rate_reg_tables[2][4][9] = {
  44 {
  45   /* standard rates */
  46   {
  47         /* 3&4 front, 7&8 rear, 6&9 center/lfe */
  48         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
  49         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
  50         0xff,                           /* slot 5 */
  51         AC97_PCM_LFE_DAC_RATE,          /* slot 6 */
  52         AC97_PCM_SURR_DAC_RATE,         /* slot 7 */
  53         AC97_PCM_SURR_DAC_RATE,         /* slot 8 */
  54         AC97_PCM_LFE_DAC_RATE,          /* slot 9 */
  55         0xff,                           /* slot 10 */
  56         0xff,                           /* slot 11 */
  57   },
  58   {
  59         /* 7&8 front, 6&9 rear, 10&11 center/lfe */
  60         0xff,                           /* slot 3 */
  61         0xff,                           /* slot 4 */
  62         0xff,                           /* slot 5 */
  63         AC97_PCM_SURR_DAC_RATE,         /* slot 6 */
  64         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
  65         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
  66         AC97_PCM_SURR_DAC_RATE,         /* slot 9 */
  67         AC97_PCM_LFE_DAC_RATE,          /* slot 10 */
  68         AC97_PCM_LFE_DAC_RATE,          /* slot 11 */
  69   },
  70   {
  71         /* 6&9 front, 10&11 rear, 3&4 center/lfe */
  72         AC97_PCM_LFE_DAC_RATE,          /* slot 3 */
  73         AC97_PCM_LFE_DAC_RATE,          /* slot 4 */
  74         0xff,                           /* slot 5 */
  75         AC97_PCM_FRONT_DAC_RATE,        /* slot 6 */
  76         0xff,                           /* slot 7 */
  77         0xff,                           /* slot 8 */
  78         AC97_PCM_FRONT_DAC_RATE,        /* slot 9 */
  79         AC97_PCM_SURR_DAC_RATE,         /* slot 10 */
  80         AC97_PCM_SURR_DAC_RATE,         /* slot 11 */
  81   },
  82   {
  83         /* 10&11 front, 3&4 rear, 7&8 center/lfe */
  84         AC97_PCM_SURR_DAC_RATE,         /* slot 3 */
  85         AC97_PCM_SURR_DAC_RATE,         /* slot 4 */
  86         0xff,                           /* slot 5 */
  87         0xff,                           /* slot 6 */
  88         AC97_PCM_LFE_DAC_RATE,          /* slot 7 */
  89         AC97_PCM_LFE_DAC_RATE,          /* slot 8 */
  90         0xff,                           /* slot 9 */
  91         AC97_PCM_FRONT_DAC_RATE,        /* slot 10 */
  92         AC97_PCM_FRONT_DAC_RATE,        /* slot 11 */
  93   },
  94 },
  95 {
  96   /* double rates */
  97   {
  98         /* 3&4 front, 7&8 front (t+1) */
  99         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
 100         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
 101         0xff,                           /* slot 5 */
 102         0xff,                           /* slot 6 */
 103         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
 104         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
 105         0xff,                           /* slot 9 */
 106         0xff,                           /* slot 10 */
 107         0xff,                           /* slot 11 */
 108   },
 109   {
 110         /* not specified in the specification */
 111         0xff,                           /* slot 3 */
 112         0xff,                           /* slot 4 */
 113         0xff,                           /* slot 5 */
 114         0xff,                           /* slot 6 */
 115         0xff,                           /* slot 7 */
 116         0xff,                           /* slot 8 */
 117         0xff,                           /* slot 9 */
 118         0xff,                           /* slot 10 */
 119         0xff,                           /* slot 11 */
 120   },
 121   {
 122         0xff,                           /* slot 3 */
 123         0xff,                           /* slot 4 */
 124         0xff,                           /* slot 5 */
 125         0xff,                           /* slot 6 */
 126         0xff,                           /* slot 7 */
 127         0xff,                           /* slot 8 */
 128         0xff,                           /* slot 9 */
 129         0xff,                           /* slot 10 */
 130         0xff,                           /* slot 11 */
 131   },
 132   {
 133         0xff,                           /* slot 3 */
 134         0xff,                           /* slot 4 */
 135         0xff,                           /* slot 5 */
 136         0xff,                           /* slot 6 */
 137         0xff,                           /* slot 7 */
 138         0xff,                           /* slot 8 */
 139         0xff,                           /* slot 9 */
 140         0xff,                           /* slot 10 */
 141         0xff,                           /* slot 11 */
 142   }
 143 }};
 144
 145 /* FIXME: more various mappings for ADC? */
 146 static unsigned char rate_cregs[9] = {
 147         AC97_PCM_LR_ADC_RATE,   /* 3 */
 148         AC97_PCM_LR_ADC_RATE,   /* 4 */
 149         0xff,                   /* 5 */
 150         AC97_PCM_MIC_ADC_RATE,  /* 6 */
 151         0xff,                   /* 7 */
 152         0xff,                   /* 8 */
 153         0xff,                   /* 9 */
 154         0xff,                   /* 10 */
 155         0xff,                   /* 11 */
 156 };
 157
 158 static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
 159                                   unsigned short slot, int dbl)
 160 {
 161         if (slot < 3)
 162                 return 0xff;
 163         if (slot > 11)
 164                 return 0xff;
 165         if (pcm->spdif)
 166                 return AC97_SPDIF; /* pseudo register */
 167         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
 168                 return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
 169         else
 170                 return rate_cregs[slot - 3];
 171 }
 172
 173 static int set_spdif_rate(struct snd_ac97 *ac97, unsigned short rate)
 174 {
 175         unsigned short old, bits, reg, mask;
 176         unsigned int sbits;
 177
 178         if (! (ac97->ext_id & AC97_EI_SPDIF))
 179                 return -ENODEV;
 180
 181         /* TODO: double rate support */
 182         if (ac97->flags & AC97_CS_SPDIF) {
 183                 switch (rate) {
 184                 case 48000: bits = 0; break;
 185                 case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
 186                 default: /* invalid - disable output */
 187                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 188                         return -EINVAL;
 189                 }
 190                 reg = AC97_CSR_SPDIF;
 191                 mask = 1 << AC97_SC_SPSR_SHIFT;
 192         } else {
 193                 if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
 194                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 195                         return -EINVAL;
 196                 }
 197                 switch (rate) {
 198                 case 44100: bits = AC97_SC_SPSR_44K; break;
 199                 case 48000: bits = AC97_SC_SPSR_48K; break;
 200                 case 32000: bits = AC97_SC_SPSR_32K; break;
 201                 default: /* invalid - disable output */
 202                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 203                         return -EINVAL;
 204                 }
 205                 reg = AC97_SPDIF;
 206                 mask = AC97_SC_SPSR_MASK;
 207         }
 208
 209         down(&ac97->reg_mutex);
 210         old = snd_ac97_read(ac97, reg) & mask;
 211         if (old != bits) {
 212                 snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 213                 snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
 214                 /* update the internal spdif bits */
 215                 sbits = ac97->spdif_status;
 216                 if (sbits & IEC958_AES0_PROFESSIONAL) {
 217                         sbits &= ~IEC958_AES0_PRO_FS;
 218                         switch (rate) {
 219                         case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
 220                         case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
 221                         case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
 222                         }
 223                 } else {
 224                         sbits &= ~(IEC958_AES3_CON_FS << 24);
 225                         switch (rate) {
 226                         case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
 227                         case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
 228                         case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
 229                         }
 230                 }
 231                 ac97->spdif_status = sbits;
 232         }
 233         snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
 234         up(&ac97->reg_mutex);
 235         return 0;
 236 }
 237
 238 /**
 239  * snd_ac97_set_rate - change the rate of the given input/output.
 240  * @ac97: the ac97 instance
 241  * @reg: the register to change
 242  * @rate: the sample rate to set
 243  *
 244  * Changes the rate of the given input/output on the codec.
 245  * If the codec doesn't support VAR, the rate must be 48000 (except
 246  * for SPDIF).
 247  *
 248  * The valid registers are AC97_PMC_MIC_ADC_RATE,
 249  * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
 250  * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
 251  * if the codec supports them.
 252  * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
 253  * status bits.
 254  *
 255  * Returns zero if successful, or a negative error code on failure.
 256  */
 257 int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
 258 {
 259         int dbl;
 260         unsigned int tmp;
 261
 262         dbl = rate > 48000;
 263         if (dbl) {
 264                 if (!(ac97->flags & AC97_DOUBLE_RATE))
 265                         return -EINVAL;
 266                 if (reg != AC97_PCM_FRONT_DAC_RATE)
 267                         return -EINVAL;
 268         }
 269
 270         switch (reg) {
 271         case AC97_PCM_MIC_ADC_RATE:
 272                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)      /* MIC VRA */
 273                         if (rate != 48000)
 274                                 return -EINVAL;
 275                 break;
 276         case AC97_PCM_FRONT_DAC_RATE:
 277         case AC97_PCM_LR_ADC_RATE:
 278                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)      /* VRA */
 279                         if (rate != 48000 && rate != 96000)
 280                                 return -EINVAL;
 281                 break;
 282         case AC97_PCM_SURR_DAC_RATE:
 283                 if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
 284                         return -EINVAL;
 285                 break;
 286         case AC97_PCM_LFE_DAC_RATE:
 287                 if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 288                         return -EINVAL;
 289                 break;
 290         case AC97_SPDIF:
 291                 /* special case */
 292                 return set_spdif_rate(ac97, rate);
 293         default:
 294                 return -EINVAL;
 295         }
 296         if (dbl)
 297                 rate /= 2;
 298         tmp = (rate * ac97->bus->clock) / 48000;
 299         if (tmp > 65535)
 300                 return -EINVAL;
 301         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
 302                 snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
 303                                      AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
 304         snd_ac97_update(ac97, reg, tmp & 0xffff);
 305         snd_ac97_read(ac97, reg);
 306         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
 307                 /* Intel controllers require double rate data to be put in
 308                  * slots 7+8
 309                  */
 310                 snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
 311                                      AC97_GP_DRSS_MASK,
 312                                      dbl ? AC97_GP_DRSS_78 : 0);
 313                 snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
 314         }
 315         return 0;
 316 }
 317
 318 static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
 319 {
 320         if (!ac97_is_audio(ac97))
 321                 return 0;
 322         if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
 323                 unsigned short slots = 0;
 324                 if (ac97_is_rev22(ac97)) {
 325                         /* Note: it's simply emulation of AMAP behaviour */
 326                         u16 es;
 327                         es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
 328                         switch (ac97->addr) {
 329                         case 1:
 330                         case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
 331                         case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
 332                         }
 333                         snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
 334                 }
 335                 switch (ac97->addr) {
 336                 case 0:
 337                         slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 338                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 339                                 slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 340                         if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
 341                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 342                         if (ac97->ext_id & AC97_EI_SPDIF) {
 343                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 344                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
 345                                 else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 346                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 347                                 else
 348                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 349                         }
 350                         *rate_table = 0;
 351                         break;
 352                 case 1:
 353                 case 2:
 354                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 355                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 356                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 357                         if (ac97->ext_id & AC97_EI_SPDIF) {
 358                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 359                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 360                                 else
 361                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 362                         }
 363                         *rate_table = 1;
 364                         break;
 365                 case 3:
 366                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 367                         if (ac97->ext_id & AC97_EI_SPDIF)
 368                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 369                         *rate_table = 2;
 370                         break;
 371                 }
 372                 return slots;
 373         } else {
 374                 unsigned short slots;
 375                 slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 376                 if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 377                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 378                 if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
 379                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 380                 if (ac97->ext_id & AC97_EI_SPDIF) {
 381                         if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 382                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
 383                         else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 384                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 385                         else
 386                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 387                 }
 388                 *rate_table = 0;
 389                 return slots;
 390         }
 391 }
 392
 393 static unsigned short get_cslots(struct snd_ac97 *ac97)
 394 {
 395         unsigned short slots;
 396
 397         if (!ac97_is_audio(ac97))
 398                 return 0;
 399         slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 400         slots |= (1<<AC97_SLOT_MIC);
 401         return slots;
 402 }
 403
 404 static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
 405 {
 406         int i, idx;
 407         unsigned int rates = ~0;
 408         unsigned char reg;
 409
 410         for (i = 3; i < 12; i++) {
 411                 if (!(slots & (1 << i)))
 412                         continue;
 413                 reg = get_slot_reg(pcm, cidx, i, dbl);
 414                 switch (reg) {
 415                 case AC97_PCM_FRONT_DAC_RATE:   idx = AC97_RATES_FRONT_DAC; break;
 416                 case AC97_PCM_SURR_DAC_RATE:    idx = AC97_RATES_SURR_DAC; break;
 417                 case AC97_PCM_LFE_DAC_RATE:     idx = AC97_RATES_LFE_DAC; break;
 418                 case AC97_PCM_LR_ADC_RATE:      idx = AC97_RATES_ADC; break;
 419                 case AC97_PCM_MIC_ADC_RATE:     idx = AC97_RATES_MIC_ADC; break;
 420                 default:                        idx = AC97_RATES_SPDIF; break;
 421                 }
 422                 rates &= pcm->r[dbl].codec[cidx]->rates[idx];
 423         }
 424         if (!dbl)
 425                 rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
 426                            SNDRV_PCM_RATE_96000);
 427         return rates;
 428 }
 429
 430 /**
 431  * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
 432  * @bus: the ac97 bus instance
 433  * @pcms_count: count of PCMs to be assigned
 434  * @pcms: PCMs to be assigned
 435  *
 436  * It assigns available AC97 slots for given PCMs. If none or only
 437  * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
 438  * are reduced and might be zero.
 439  */
 440 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
 441                         unsigned short pcms_count,
 442                         const struct ac97_pcm *pcms)
 443 {
 444         int i, j, k;
 445         const struct ac97_pcm *pcm;
 446         struct ac97_pcm *rpcms, *rpcm;
 447         unsigned short avail_slots[2][4];
 448         unsigned char rate_table[2][4];
 449         unsigned short tmp, slots;
 450         unsigned short spdif_slots[4];
 451         unsigned int rates;
 452         struct snd_ac97 *codec;
 453
 454         rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
 455         if (rpcms == NULL)
 456                 return -ENOMEM;
 457         memset(avail_slots, 0, sizeof(avail_slots));
 458         memset(rate_table, 0, sizeof(rate_table));
 459         memset(spdif_slots, 0, sizeof(spdif_slots));
 460         for (i = 0; i < 4; i++) {
 461                 codec = bus->codec[i];
 462                 if (!codec)
 463                         continue;
 464                 avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
 465                 avail_slots[1][i] = get_cslots(codec);
 466                 if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
 467                         for (j = 0; j < i; j++) {
 468                                 if (bus->codec[j])
 469                                         avail_slots[1][i] &= ~avail_slots[1][j];
 470                         }
 471                 }
 472         }
 473         /* first step - exclusive devices */
 474         for (i = 0; i < pcms_count; i++) {
 475                 pcm = &pcms[i];
 476                 rpcm = &rpcms[i];
 477                 /* low-level driver thinks that it's more clever */
 478                 if (pcm->copy_flag) {
 479                         *rpcm = *pcm;
 480                         continue;
 481                 }
 482                 rpcm->stream = pcm->stream;
 483                 rpcm->exclusive = pcm->exclusive;
 484                 rpcm->spdif = pcm->spdif;
 485                 rpcm->private_value = pcm->private_value;
 486                 rpcm->bus = bus;
 487                 rpcm->rates = ~0;
 488                 slots = pcm->r[0].slots;
 489                 for (j = 0; j < 4 && slots; j++) {
 490                         if (!bus->codec[j])
 491                                 continue;
 492                         rates = ~0;
 493                         if (pcm->spdif && pcm->stream == 0)
 494                                 tmp = spdif_slots[j];
 495                         else
 496                                 tmp = avail_slots[pcm->stream][j];
 497                         if (pcm->exclusive) {
 498                                 /* exclusive access */
 499                                 tmp &= slots;
 500                                 for (k = 0; k < i; k++) {
 501                                         if (rpcm->stream == rpcms[k].stream)
 502                                                 tmp &= ~rpcms[k].r[0].rslots[j];
 503                                 }
 504                         } else {
 505                                 /* non-exclusive access */
 506                                 tmp &= pcm->r[0].slots;
 507                         }
 508                         if (tmp) {
 509                                 rpcm->r[0].rslots[j] = tmp;
 510                                 rpcm->r[0].codec[j] = bus->codec[j];
 511                                 rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
 512                                 if (bus->no_vra)
 513                                         rates = SNDRV_PCM_RATE_48000;
 514                                 else
 515                                         rates = get_rates(rpcm, j, tmp, 0);
 516                                 if (pcm->exclusive)
 517                                         avail_slots[pcm->stream][j] &= ~tmp;
 518                         }
 519                         slots &= ~tmp;
 520                         rpcm->r[0].slots |= tmp;
 521                         rpcm->rates &= rates;
 522                 }
 523                 /* for double rate, we check the first codec only */
 524                 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 525                     bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
 526                     rate_table[pcm->stream][0] == 0) {
 527                         tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
 528                               (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
 529                         if ((tmp & pcm->r[1].slots) == tmp) {
 530                                 rpcm->r[1].slots = tmp;
 531                                 rpcm->r[1].rslots[0] = tmp;
 532                                 rpcm->r[1].rate_table[0] = 0;
 533                                 rpcm->r[1].codec[0] = bus->codec[0];
 534                                 if (pcm->exclusive)
 535                                         avail_slots[pcm->stream][0] &= ~tmp;
 536                                 if (bus->no_vra)
 537                                         rates = SNDRV_PCM_RATE_96000;
 538                                 else
 539                                         rates = get_rates(rpcm, 0, tmp, 1);
 540                                 rpcm->rates |= rates;
 541                         }
 542                 }
 543                 if (rpcm->rates == ~0)
 544                         rpcm->rates = 0; /* not used */
 545         }
 546         bus->pcms_count = pcms_count;
 547         bus->pcms = rpcms;
 548         return 0;
 549 }
 550
 551 /**
 552  * snd_ac97_pcm_open - opens the given AC97 pcm
 553  * @pcm: the ac97 pcm instance
 554  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
 555  * @cfg: output stream characteristics
 556  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
 557  *
 558  * It locks the specified slots and sets the given rate to AC97 registers.
 559  */
 560 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
 561                       enum ac97_pcm_cfg cfg, unsigned short slots)
 562 {
 563         struct snd_ac97_bus *bus;
 564         int i, cidx, r, ok_flag;
 565         unsigned int reg_ok[4] = {0,0,0,0};
 566         unsigned char reg;
 567         int err = 0;
 568
 569         r = rate > 48000;
 570         bus = pcm->bus;
 571         if (cfg == AC97_PCM_CFG_SPDIF) {
 572                 int err;
 573                 for (cidx = 0; cidx < 4; cidx++)
 574                         if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
 575                                 err = set_spdif_rate(bus->codec[cidx], rate);
 576                                 if (err < 0)
 577                                         return err;
 578                         }
 579         }
 580         spin_lock_irq(&pcm->bus->bus_lock);
 581         for (i = 3; i < 12; i++) {
 582                 if (!(slots & (1 << i)))
 583                         continue;
 584                 ok_flag = 0;
 585                 for (cidx = 0; cidx < 4; cidx++) {
 586                         if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
 587                                 spin_unlock_irq(&pcm->bus->bus_lock);
 588                                 err = -EBUSY;
 589                                 goto error;
 590                         }
 591                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
 592                                 bus->used_slots[pcm->stream][cidx] |= (1 << i);
 593                                 ok_flag++;
 594                         }
 595                 }
 596                 if (!ok_flag) {
 597                         spin_unlock_irq(&pcm->bus->bus_lock);
 598                         snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
 599                         err = -EAGAIN;
 600                         goto error;
 601                 }
 602         }
 603         spin_unlock_irq(&pcm->bus->bus_lock);
 604         for (i = 3; i < 12; i++) {
 605                 if (!(slots & (1 << i)))
 606                         continue;
 607                 for (cidx = 0; cidx < 4; cidx++) {
 608                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
 609                                 reg = get_slot_reg(pcm, cidx, i, r);
 610                                 if (reg == 0xff) {
 611                                         snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
 612                                         continue;
 613                                 }
 614                                 if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
 615                                         continue;
 616                                 //printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
 617                                 err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
 618                                 if (err < 0)
 619                                         snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
 620                                 else
 621                                         reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
 622                         }
 623                 }
 624         }
 625         pcm->aslots = slots;
 626         return 0;
 627
 628  error:
 629         pcm->aslots = slots;
 630         snd_ac97_pcm_close(pcm);
 631         return err;
 632 }
 633
 634 /**
 635  * snd_ac97_pcm_close - closes the given AC97 pcm
 636  * @pcm: the ac97 pcm instance
 637  *
 638  * It frees the locked AC97 slots.
 639  */
 640 int snd_ac97_pcm_close(struct ac97_pcm *pcm)
 641 {
 642         struct snd_ac97_bus *bus;
 643         unsigned short slots = pcm->aslots;
 644         int i, cidx;
 645
 646         bus = pcm->bus;
 647         spin_lock_irq(&pcm->bus->bus_lock);
 648         for (i = 3; i < 12; i++) {
 649                 if (!(slots & (1 << i)))
 650                         continue;
 651                 for (cidx = 0; cidx < 4; cidx++)
 652                         bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
 653         }
 654         pcm->aslots = 0;
 655         spin_unlock_irq(&pcm->bus->bus_lock);
 656         return 0;
 657 }
 658
 659 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
 660                                           struct snd_pcm_hw_rule *rule)
 661 {
 662         struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 663         if (channels->min > 2) {
 664                 static const struct snd_interval single_rates = {
 665                         .min = 1,
 666                         .max = 48000,
 667                 };
 668                 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 669                 return snd_interval_refine(rate, &single_rates);
 670         }
 671         return 0;
 672 }
 673
 674 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
 675                                               struct snd_pcm_hw_rule *rule)
 676 {
 677         struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 678         if (rate->min > 48000) {
 679                 static const struct snd_interval double_rate_channels = {
 680                         .min = 2,
 681                         .max = 2,
 682                 };
 683                 struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 684                 return snd_interval_refine(channels, &double_rate_channels);
 685         }
 686         return 0;
 687 }
 688
 689 /**
 690  * snd_ac97_pcm_double_rate_rules - set double rate constraints
 691  * @runtime: the runtime of the ac97 front playback pcm
 692  *
 693  * Installs the hardware constraint rules to prevent using double rates and
 694  * more than two channels at the same time.
 695  */
 696 int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
 697 {
 698         int err;
 699
 700         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 701                                   double_rate_hw_constraint_rate, NULL,
 702                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 703         if (err < 0)
 704                 return err;
 705         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 706                                   double_rate_hw_constraint_channels, NULL,
 707                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 708         return err;
 709 }