git.oblomov.eu Git - linux-2.6/blob - sound/pci/ac97/ac97_pcm.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/delay.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/mutex.h>
  30
  31 #include <sound/core.h>
  32 #include <sound/pcm.h>
  33 #include <sound/control.h>
  34 #include <sound/ac97_codec.h>
  35 #include <sound/asoundef.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         mutex_lock(&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         mutex_unlock(&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         snd_ac97_update_power(ac97, reg, 1);
 271         switch (reg) {
 272         case AC97_PCM_MIC_ADC_RATE:
 273                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)      /* MIC VRA */
 274                         if (rate != 48000)
 275                                 return -EINVAL;
 276                 break;
 277         case AC97_PCM_FRONT_DAC_RATE:
 278         case AC97_PCM_LR_ADC_RATE:
 279                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)      /* VRA */
 280                         if (rate != 48000 && rate != 96000)
 281                                 return -EINVAL;
 282                 break;
 283         case AC97_PCM_SURR_DAC_RATE:
 284                 if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
 285                         return -EINVAL;
 286                 break;
 287         case AC97_PCM_LFE_DAC_RATE:
 288                 if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 289                         return -EINVAL;
 290                 break;
 291         case AC97_SPDIF:
 292                 /* special case */
 293                 return set_spdif_rate(ac97, rate);
 294         default:
 295                 return -EINVAL;
 296         }
 297         if (dbl)
 298                 rate /= 2;
 299         tmp = (rate * ac97->bus->clock) / 48000;
 300         if (tmp > 65535)
 301                 return -EINVAL;
 302         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
 303                 snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
 304                                      AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
 305         snd_ac97_update(ac97, reg, tmp & 0xffff);
 306         snd_ac97_read(ac97, reg);
 307         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
 308                 /* Intel controllers require double rate data to be put in
 309                  * slots 7+8
 310                  */
 311                 snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
 312                                      AC97_GP_DRSS_MASK,
 313                                      dbl ? AC97_GP_DRSS_78 : 0);
 314                 snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
 315         }
 316         return 0;
 317 }
 318
 319 EXPORT_SYMBOL(snd_ac97_set_rate);
 320
 321 static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
 322 {
 323         if (!ac97_is_audio(ac97))
 324                 return 0;
 325         if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
 326                 unsigned short slots = 0;
 327                 if (ac97_is_rev22(ac97)) {
 328                         /* Note: it's simply emulation of AMAP behaviour */
 329                         u16 es;
 330                         es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
 331                         switch (ac97->addr) {
 332                         case 1:
 333                         case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
 334                         case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
 335                         }
 336                         snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
 337                 }
 338                 switch (ac97->addr) {
 339                 case 0:
 340                         slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 341                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 342                                 slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 343                         if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
 344                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 345                         if (ac97->ext_id & AC97_EI_SPDIF) {
 346                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 347                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
 348                                 else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 349                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 350                                 else
 351                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 352                         }
 353                         *rate_table = 0;
 354                         break;
 355                 case 1:
 356                 case 2:
 357                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 358                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 359                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 360                         if (ac97->ext_id & AC97_EI_SPDIF) {
 361                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 362                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 363                                 else
 364                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 365                         }
 366                         *rate_table = 1;
 367                         break;
 368                 case 3:
 369                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 370                         if (ac97->ext_id & AC97_EI_SPDIF)
 371                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 372                         *rate_table = 2;
 373                         break;
 374                 }
 375                 return slots;
 376         } else {
 377                 unsigned short slots;
 378                 slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 379                 if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 380                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 381                 if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
 382                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 383                 if (ac97->ext_id & AC97_EI_SPDIF) {
 384                         if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 385                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
 386                         else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 387                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 388                         else
 389                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 390                 }
 391                 *rate_table = 0;
 392                 return slots;
 393         }
 394 }
 395
 396 static unsigned short get_cslots(struct snd_ac97 *ac97)
 397 {
 398         unsigned short slots;
 399
 400         if (!ac97_is_audio(ac97))
 401                 return 0;
 402         slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 403         slots |= (1<<AC97_SLOT_MIC);
 404         return slots;
 405 }
 406
 407 static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
 408 {
 409         int i, idx;
 410         unsigned int rates = ~0;
 411         unsigned char reg;
 412
 413         for (i = 3; i < 12; i++) {
 414                 if (!(slots & (1 << i)))
 415                         continue;
 416                 reg = get_slot_reg(pcm, cidx, i, dbl);
 417                 switch (reg) {
 418                 case AC97_PCM_FRONT_DAC_RATE:   idx = AC97_RATES_FRONT_DAC; break;
 419                 case AC97_PCM_SURR_DAC_RATE:    idx = AC97_RATES_SURR_DAC; break;
 420                 case AC97_PCM_LFE_DAC_RATE:     idx = AC97_RATES_LFE_DAC; break;
 421                 case AC97_PCM_LR_ADC_RATE:      idx = AC97_RATES_ADC; break;
 422                 case AC97_PCM_MIC_ADC_RATE:     idx = AC97_RATES_MIC_ADC; break;
 423                 default:                        idx = AC97_RATES_SPDIF; break;
 424                 }
 425                 rates &= pcm->r[dbl].codec[cidx]->rates[idx];
 426         }
 427         if (!dbl)
 428                 rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
 429                            SNDRV_PCM_RATE_96000);
 430         return rates;
 431 }
 432
 433 /**
 434  * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
 435  * @bus: the ac97 bus instance
 436  * @pcms_count: count of PCMs to be assigned
 437  * @pcms: PCMs to be assigned
 438  *
 439  * It assigns available AC97 slots for given PCMs. If none or only
 440  * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
 441  * are reduced and might be zero.
 442  */
 443 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
 444                         unsigned short pcms_count,
 445                         const struct ac97_pcm *pcms)
 446 {
 447         int i, j, k;
 448         const struct ac97_pcm *pcm;
 449         struct ac97_pcm *rpcms, *rpcm;
 450         unsigned short avail_slots[2][4];
 451         unsigned char rate_table[2][4];
 452         unsigned short tmp, slots;
 453         unsigned short spdif_slots[4];
 454         unsigned int rates;
 455         struct snd_ac97 *codec;
 456
 457         rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
 458         if (rpcms == NULL)
 459                 return -ENOMEM;
 460         memset(avail_slots, 0, sizeof(avail_slots));
 461         memset(rate_table, 0, sizeof(rate_table));
 462         memset(spdif_slots, 0, sizeof(spdif_slots));
 463         for (i = 0; i < 4; i++) {
 464                 codec = bus->codec[i];
 465                 if (!codec)
 466                         continue;
 467                 avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
 468                 avail_slots[1][i] = get_cslots(codec);
 469                 if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
 470                         for (j = 0; j < i; j++) {
 471                                 if (bus->codec[j])
 472                                         avail_slots[1][i] &= ~avail_slots[1][j];
 473                         }
 474                 }
 475         }
 476         /* first step - exclusive devices */
 477         for (i = 0; i < pcms_count; i++) {
 478                 pcm = &pcms[i];
 479                 rpcm = &rpcms[i];
 480                 /* low-level driver thinks that it's more clever */
 481                 if (pcm->copy_flag) {
 482                         *rpcm = *pcm;
 483                         continue;
 484                 }
 485                 rpcm->stream = pcm->stream;
 486                 rpcm->exclusive = pcm->exclusive;
 487                 rpcm->spdif = pcm->spdif;
 488                 rpcm->private_value = pcm->private_value;
 489                 rpcm->bus = bus;
 490                 rpcm->rates = ~0;
 491                 slots = pcm->r[0].slots;
 492                 for (j = 0; j < 4 && slots; j++) {
 493                         if (!bus->codec[j])
 494                                 continue;
 495                         rates = ~0;
 496                         if (pcm->spdif && pcm->stream == 0)
 497                                 tmp = spdif_slots[j];
 498                         else
 499                                 tmp = avail_slots[pcm->stream][j];
 500                         if (pcm->exclusive) {
 501                                 /* exclusive access */
 502                                 tmp &= slots;
 503                                 for (k = 0; k < i; k++) {
 504                                         if (rpcm->stream == rpcms[k].stream)
 505                                                 tmp &= ~rpcms[k].r[0].rslots[j];
 506                                 }
 507                         } else {
 508                                 /* non-exclusive access */
 509                                 tmp &= pcm->r[0].slots;
 510                         }
 511                         if (tmp) {
 512                                 rpcm->r[0].rslots[j] = tmp;
 513                                 rpcm->r[0].codec[j] = bus->codec[j];
 514                                 rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
 515                                 if (bus->no_vra)
 516                                         rates = SNDRV_PCM_RATE_48000;
 517                                 else
 518                                         rates = get_rates(rpcm, j, tmp, 0);
 519                                 if (pcm->exclusive)
 520                                         avail_slots[pcm->stream][j] &= ~tmp;
 521                         }
 522                         slots &= ~tmp;
 523                         rpcm->r[0].slots |= tmp;
 524                         rpcm->rates &= rates;
 525                 }
 526                 /* for double rate, we check the first codec only */
 527                 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 528                     bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
 529                     rate_table[pcm->stream][0] == 0) {
 530                         tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
 531                               (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
 532                         if ((tmp & pcm->r[1].slots) == tmp) {
 533                                 rpcm->r[1].slots = tmp;
 534                                 rpcm->r[1].rslots[0] = tmp;
 535                                 rpcm->r[1].rate_table[0] = 0;
 536                                 rpcm->r[1].codec[0] = bus->codec[0];
 537                                 if (pcm->exclusive)
 538                                         avail_slots[pcm->stream][0] &= ~tmp;
 539                                 if (bus->no_vra)
 540                                         rates = SNDRV_PCM_RATE_96000;
 541                                 else
 542                                         rates = get_rates(rpcm, 0, tmp, 1);
 543                                 rpcm->rates |= rates;
 544                         }
 545                 }
 546                 if (rpcm->rates == ~0)
 547                         rpcm->rates = 0; /* not used */
 548         }
 549         bus->pcms_count = pcms_count;
 550         bus->pcms = rpcms;
 551         return 0;
 552 }
 553
 554 EXPORT_SYMBOL(snd_ac97_pcm_assign);
 555
 556 /**
 557  * snd_ac97_pcm_open - opens the given AC97 pcm
 558  * @pcm: the ac97 pcm instance
 559  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
 560  * @cfg: output stream characteristics
 561  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
 562  *
 563  * It locks the specified slots and sets the given rate to AC97 registers.
 564  */
 565 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
 566                       enum ac97_pcm_cfg cfg, unsigned short slots)
 567 {
 568         struct snd_ac97_bus *bus;
 569         int i, cidx, r, ok_flag;
 570         unsigned int reg_ok[4] = {0,0,0,0};
 571         unsigned char reg;
 572         int err = 0;
 573
 574         r = rate > 48000;
 575         bus = pcm->bus;
 576         if (cfg == AC97_PCM_CFG_SPDIF) {
 577                 int err;
 578                 for (cidx = 0; cidx < 4; cidx++)
 579                         if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
 580                                 err = set_spdif_rate(bus->codec[cidx], rate);
 581                                 if (err < 0)
 582                                         return err;
 583                         }
 584         }
 585         spin_lock_irq(&pcm->bus->bus_lock);
 586         for (i = 3; i < 12; i++) {
 587                 if (!(slots & (1 << i)))
 588                         continue;
 589                 ok_flag = 0;
 590                 for (cidx = 0; cidx < 4; cidx++) {
 591                         if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
 592                                 spin_unlock_irq(&pcm->bus->bus_lock);
 593                                 err = -EBUSY;
 594                                 goto error;
 595                         }
 596                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
 597                                 bus->used_slots[pcm->stream][cidx] |= (1 << i);
 598                                 ok_flag++;
 599                         }
 600                 }
 601                 if (!ok_flag) {
 602                         spin_unlock_irq(&pcm->bus->bus_lock);
 603                         snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
 604                         err = -EAGAIN;
 605                         goto error;
 606                 }
 607         }
 608         pcm->cur_dbl = r;
 609         spin_unlock_irq(&pcm->bus->bus_lock);
 610         for (i = 3; i < 12; i++) {
 611                 if (!(slots & (1 << i)))
 612                         continue;
 613                 for (cidx = 0; cidx < 4; cidx++) {
 614                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
 615                                 reg = get_slot_reg(pcm, cidx, i, r);
 616                                 if (reg == 0xff) {
 617                                         snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
 618                                         continue;
 619                                 }
 620                                 if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
 621                                         continue;
 622                                 //printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
 623                                 err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
 624                                 if (err < 0)
 625                                         snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
 626                                 else
 627                                         reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
 628                         }
 629                 }
 630         }
 631         pcm->aslots = slots;
 632         return 0;
 633
 634  error:
 635         pcm->aslots = slots;
 636         snd_ac97_pcm_close(pcm);
 637         return err;
 638 }
 639
 640 EXPORT_SYMBOL(snd_ac97_pcm_open);
 641
 642 /**
 643  * snd_ac97_pcm_close - closes the given AC97 pcm
 644  * @pcm: the ac97 pcm instance
 645  *
 646  * It frees the locked AC97 slots.
 647  */
 648 int snd_ac97_pcm_close(struct ac97_pcm *pcm)
 649 {
 650         struct snd_ac97_bus *bus;
 651         unsigned short slots = pcm->aslots;
 652         int i, cidx;
 653
 654 #ifdef CONFIG_SND_AC97_POWER_SAVE
 655         int r = pcm->cur_dbl;
 656         for (i = 3; i < 12; i++) {
 657                 if (!(slots & (1 << i)))
 658                         continue;
 659                 for (cidx = 0; cidx < 4; cidx++) {
 660                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
 661                                 int reg = get_slot_reg(pcm, cidx, i, r);
 662                                 snd_ac97_update_power(pcm->r[r].codec[cidx],
 663                                                       reg, 0);
 664                         }
 665                 }
 666         }
 667 #endif
 668
 669         bus = pcm->bus;
 670         spin_lock_irq(&pcm->bus->bus_lock);
 671         for (i = 3; i < 12; i++) {
 672                 if (!(slots & (1 << i)))
 673                         continue;
 674                 for (cidx = 0; cidx < 4; cidx++)
 675                         bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
 676         }
 677         pcm->aslots = 0;
 678         pcm->cur_dbl = 0;
 679         spin_unlock_irq(&pcm->bus->bus_lock);
 680         return 0;
 681 }
 682
 683 EXPORT_SYMBOL(snd_ac97_pcm_close);
 684
 685 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
 686                                           struct snd_pcm_hw_rule *rule)
 687 {
 688         struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 689         if (channels->min > 2) {
 690                 static const struct snd_interval single_rates = {
 691                         .min = 1,
 692                         .max = 48000,
 693                 };
 694                 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 695                 return snd_interval_refine(rate, &single_rates);
 696         }
 697         return 0;
 698 }
 699
 700 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
 701                                               struct snd_pcm_hw_rule *rule)
 702 {
 703         struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 704         if (rate->min > 48000) {
 705                 static const struct snd_interval double_rate_channels = {
 706                         .min = 2,
 707                         .max = 2,
 708                 };
 709                 struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 710                 return snd_interval_refine(channels, &double_rate_channels);
 711         }
 712         return 0;
 713 }
 714
 715 /**
 716  * snd_ac97_pcm_double_rate_rules - set double rate constraints
 717  * @runtime: the runtime of the ac97 front playback pcm
 718  *
 719  * Installs the hardware constraint rules to prevent using double rates and
 720  * more than two channels at the same time.
 721  */
 722 int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
 723 {
 724         int err;
 725
 726         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 727                                   double_rate_hw_constraint_rate, NULL,
 728                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 729         if (err < 0)
 730                 return err;
 731         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 732                                   double_rate_hw_constraint_channels, NULL,
 733                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 734         return err;
 735 }
 736
 737 EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);