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 <linux/mutex.h>
  31
  32 #include <sound/core.h>
  33 #include <sound/pcm.h>
  34 #include <sound/control.h>
  35 #include <sound/ac97_codec.h>
  36 #include <sound/asoundef.h>
  37 #include "ac97_patch.h"
  38 #include "ac97_id.h"
  39 #include "ac97_local.h"
  40
  41 /*
  42  *  PCM support
  43  */
  44
  45 static unsigned char rate_reg_tables[2][4][9] = {
  46 {
  47   /* standard rates */
  48   {
  49         /* 3&4 front, 7&8 rear, 6&9 center/lfe */
  50         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
  51         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
  52         0xff,                           /* slot 5 */
  53         AC97_PCM_LFE_DAC_RATE,          /* slot 6 */
  54         AC97_PCM_SURR_DAC_RATE,         /* slot 7 */
  55         AC97_PCM_SURR_DAC_RATE,         /* slot 8 */
  56         AC97_PCM_LFE_DAC_RATE,          /* slot 9 */
  57         0xff,                           /* slot 10 */
  58         0xff,                           /* slot 11 */
  59   },
  60   {
  61         /* 7&8 front, 6&9 rear, 10&11 center/lfe */
  62         0xff,                           /* slot 3 */
  63         0xff,                           /* slot 4 */
  64         0xff,                           /* slot 5 */
  65         AC97_PCM_SURR_DAC_RATE,         /* slot 6 */
  66         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
  67         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
  68         AC97_PCM_SURR_DAC_RATE,         /* slot 9 */
  69         AC97_PCM_LFE_DAC_RATE,          /* slot 10 */
  70         AC97_PCM_LFE_DAC_RATE,          /* slot 11 */
  71   },
  72   {
  73         /* 6&9 front, 10&11 rear, 3&4 center/lfe */
  74         AC97_PCM_LFE_DAC_RATE,          /* slot 3 */
  75         AC97_PCM_LFE_DAC_RATE,          /* slot 4 */
  76         0xff,                           /* slot 5 */
  77         AC97_PCM_FRONT_DAC_RATE,        /* slot 6 */
  78         0xff,                           /* slot 7 */
  79         0xff,                           /* slot 8 */
  80         AC97_PCM_FRONT_DAC_RATE,        /* slot 9 */
  81         AC97_PCM_SURR_DAC_RATE,         /* slot 10 */
  82         AC97_PCM_SURR_DAC_RATE,         /* slot 11 */
  83   },
  84   {
  85         /* 10&11 front, 3&4 rear, 7&8 center/lfe */
  86         AC97_PCM_SURR_DAC_RATE,         /* slot 3 */
  87         AC97_PCM_SURR_DAC_RATE,         /* slot 4 */
  88         0xff,                           /* slot 5 */
  89         0xff,                           /* slot 6 */
  90         AC97_PCM_LFE_DAC_RATE,          /* slot 7 */
  91         AC97_PCM_LFE_DAC_RATE,          /* slot 8 */
  92         0xff,                           /* slot 9 */
  93         AC97_PCM_FRONT_DAC_RATE,        /* slot 10 */
  94         AC97_PCM_FRONT_DAC_RATE,        /* slot 11 */
  95   },
  96 },
  97 {
  98   /* double rates */
  99   {
 100         /* 3&4 front, 7&8 front (t+1) */
 101         AC97_PCM_FRONT_DAC_RATE,        /* slot 3 */
 102         AC97_PCM_FRONT_DAC_RATE,        /* slot 4 */
 103         0xff,                           /* slot 5 */
 104         0xff,                           /* slot 6 */
 105         AC97_PCM_FRONT_DAC_RATE,        /* slot 7 */
 106         AC97_PCM_FRONT_DAC_RATE,        /* slot 8 */
 107         0xff,                           /* slot 9 */
 108         0xff,                           /* slot 10 */
 109         0xff,                           /* slot 11 */
 110   },
 111   {
 112         /* not specified in the specification */
 113         0xff,                           /* slot 3 */
 114         0xff,                           /* slot 4 */
 115         0xff,                           /* slot 5 */
 116         0xff,                           /* slot 6 */
 117         0xff,                           /* slot 7 */
 118         0xff,                           /* slot 8 */
 119         0xff,                           /* slot 9 */
 120         0xff,                           /* slot 10 */
 121         0xff,                           /* slot 11 */
 122   },
 123   {
 124         0xff,                           /* slot 3 */
 125         0xff,                           /* slot 4 */
 126         0xff,                           /* slot 5 */
 127         0xff,                           /* slot 6 */
 128         0xff,                           /* slot 7 */
 129         0xff,                           /* slot 8 */
 130         0xff,                           /* slot 9 */
 131         0xff,                           /* slot 10 */
 132         0xff,                           /* slot 11 */
 133   },
 134   {
 135         0xff,                           /* slot 3 */
 136         0xff,                           /* slot 4 */
 137         0xff,                           /* slot 5 */
 138         0xff,                           /* slot 6 */
 139         0xff,                           /* slot 7 */
 140         0xff,                           /* slot 8 */
 141         0xff,                           /* slot 9 */
 142         0xff,                           /* slot 10 */
 143         0xff,                           /* slot 11 */
 144   }
 145 }};
 146
 147 /* FIXME: more various mappings for ADC? */
 148 static unsigned char rate_cregs[9] = {
 149         AC97_PCM_LR_ADC_RATE,   /* 3 */
 150         AC97_PCM_LR_ADC_RATE,   /* 4 */
 151         0xff,                   /* 5 */
 152         AC97_PCM_MIC_ADC_RATE,  /* 6 */
 153         0xff,                   /* 7 */
 154         0xff,                   /* 8 */
 155         0xff,                   /* 9 */
 156         0xff,                   /* 10 */
 157         0xff,                   /* 11 */
 158 };
 159
 160 static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
 161                                   unsigned short slot, int dbl)
 162 {
 163         if (slot < 3)
 164                 return 0xff;
 165         if (slot > 11)
 166                 return 0xff;
 167         if (pcm->spdif)
 168                 return AC97_SPDIF; /* pseudo register */
 169         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
 170                 return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
 171         else
 172                 return rate_cregs[slot - 3];
 173 }
 174
 175 static int set_spdif_rate(struct snd_ac97 *ac97, unsigned short rate)
 176 {
 177         unsigned short old, bits, reg, mask;
 178         unsigned int sbits;
 179
 180         if (! (ac97->ext_id & AC97_EI_SPDIF))
 181                 return -ENODEV;
 182
 183         /* TODO: double rate support */
 184         if (ac97->flags & AC97_CS_SPDIF) {
 185                 switch (rate) {
 186                 case 48000: bits = 0; break;
 187                 case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
 188                 default: /* invalid - disable output */
 189                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 190                         return -EINVAL;
 191                 }
 192                 reg = AC97_CSR_SPDIF;
 193                 mask = 1 << AC97_SC_SPSR_SHIFT;
 194         } else {
 195                 if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
 196                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 197                         return -EINVAL;
 198                 }
 199                 switch (rate) {
 200                 case 44100: bits = AC97_SC_SPSR_44K; break;
 201                 case 48000: bits = AC97_SC_SPSR_48K; break;
 202                 case 32000: bits = AC97_SC_SPSR_32K; break;
 203                 default: /* invalid - disable output */
 204                         snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 205                         return -EINVAL;
 206                 }
 207                 reg = AC97_SPDIF;
 208                 mask = AC97_SC_SPSR_MASK;
 209         }
 210
 211         mutex_lock(&ac97->reg_mutex);
 212         old = snd_ac97_read(ac97, reg) & mask;
 213         if (old != bits) {
 214                 snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
 215                 snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
 216                 /* update the internal spdif bits */
 217                 sbits = ac97->spdif_status;
 218                 if (sbits & IEC958_AES0_PROFESSIONAL) {
 219                         sbits &= ~IEC958_AES0_PRO_FS;
 220                         switch (rate) {
 221                         case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
 222                         case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
 223                         case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
 224                         }
 225                 } else {
 226                         sbits &= ~(IEC958_AES3_CON_FS << 24);
 227                         switch (rate) {
 228                         case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
 229                         case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
 230                         case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
 231                         }
 232                 }
 233                 ac97->spdif_status = sbits;
 234         }
 235         snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
 236         mutex_unlock(&ac97->reg_mutex);
 237         return 0;
 238 }
 239
 240 /**
 241  * snd_ac97_set_rate - change the rate of the given input/output.
 242  * @ac97: the ac97 instance
 243  * @reg: the register to change
 244  * @rate: the sample rate to set
 245  *
 246  * Changes the rate of the given input/output on the codec.
 247  * If the codec doesn't support VAR, the rate must be 48000 (except
 248  * for SPDIF).
 249  *
 250  * The valid registers are AC97_PMC_MIC_ADC_RATE,
 251  * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
 252  * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
 253  * if the codec supports them.
 254  * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
 255  * status bits.
 256  *
 257  * Returns zero if successful, or a negative error code on failure.
 258  */
 259 int snd_ac97_set_rate(struct snd_ac97 *ac97, int reg, unsigned int rate)
 260 {
 261         int dbl;
 262         unsigned int tmp;
 263
 264         dbl = rate > 48000;
 265         if (dbl) {
 266                 if (!(ac97->flags & AC97_DOUBLE_RATE))
 267                         return -EINVAL;
 268                 if (reg != AC97_PCM_FRONT_DAC_RATE)
 269                         return -EINVAL;
 270         }
 271
 272         switch (reg) {
 273         case AC97_PCM_MIC_ADC_RATE:
 274                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)      /* MIC VRA */
 275                         if (rate != 48000)
 276                                 return -EINVAL;
 277                 break;
 278         case AC97_PCM_FRONT_DAC_RATE:
 279         case AC97_PCM_LR_ADC_RATE:
 280                 if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)      /* VRA */
 281                         if (rate != 48000 && rate != 96000)
 282                                 return -EINVAL;
 283                 break;
 284         case AC97_PCM_SURR_DAC_RATE:
 285                 if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
 286                         return -EINVAL;
 287                 break;
 288         case AC97_PCM_LFE_DAC_RATE:
 289                 if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 290                         return -EINVAL;
 291                 break;
 292         case AC97_SPDIF:
 293                 /* special case */
 294                 return set_spdif_rate(ac97, rate);
 295         default:
 296                 return -EINVAL;
 297         }
 298         if (dbl)
 299                 rate /= 2;
 300         tmp = (rate * ac97->bus->clock) / 48000;
 301         if (tmp > 65535)
 302                 return -EINVAL;
 303         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
 304                 snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
 305                                      AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
 306         snd_ac97_update(ac97, reg, tmp & 0xffff);
 307         snd_ac97_read(ac97, reg);
 308         if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
 309                 /* Intel controllers require double rate data to be put in
 310                  * slots 7+8
 311                  */
 312                 snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
 313                                      AC97_GP_DRSS_MASK,
 314                                      dbl ? AC97_GP_DRSS_78 : 0);
 315                 snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
 316         }
 317         return 0;
 318 }
 319
 320 EXPORT_SYMBOL(snd_ac97_set_rate);
 321
 322 static unsigned short get_pslots(struct snd_ac97 *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
 323 {
 324         if (!ac97_is_audio(ac97))
 325                 return 0;
 326         if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
 327                 unsigned short slots = 0;
 328                 if (ac97_is_rev22(ac97)) {
 329                         /* Note: it's simply emulation of AMAP behaviour */
 330                         u16 es;
 331                         es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
 332                         switch (ac97->addr) {
 333                         case 1:
 334                         case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
 335                         case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
 336                         }
 337                         snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
 338                 }
 339                 switch (ac97->addr) {
 340                 case 0:
 341                         slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 342                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 343                                 slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 344                         if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
 345                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 346                         if (ac97->ext_id & AC97_EI_SPDIF) {
 347                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 348                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
 349                                 else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 350                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 351                                 else
 352                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 353                         }
 354                         *rate_table = 0;
 355                         break;
 356                 case 1:
 357                 case 2:
 358                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 359                         if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 360                                 slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 361                         if (ac97->ext_id & AC97_EI_SPDIF) {
 362                                 if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 363                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 364                                 else
 365                                         *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 366                         }
 367                         *rate_table = 1;
 368                         break;
 369                 case 3:
 370                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 371                         if (ac97->ext_id & AC97_EI_SPDIF)
 372                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 373                         *rate_table = 2;
 374                         break;
 375                 }
 376                 return slots;
 377         } else {
 378                 unsigned short slots;
 379                 slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 380                 if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
 381                         slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
 382                 if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
 383                         slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
 384                 if (ac97->ext_id & AC97_EI_SPDIF) {
 385                         if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
 386                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
 387                         else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
 388                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
 389                         else
 390                                 *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
 391                 }
 392                 *rate_table = 0;
 393                 return slots;
 394         }
 395 }
 396
 397 static unsigned short get_cslots(struct snd_ac97 *ac97)
 398 {
 399         unsigned short slots;
 400
 401         if (!ac97_is_audio(ac97))
 402                 return 0;
 403         slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
 404         slots |= (1<<AC97_SLOT_MIC);
 405         return slots;
 406 }
 407
 408 static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
 409 {
 410         int i, idx;
 411         unsigned int rates = ~0;
 412         unsigned char reg;
 413
 414         for (i = 3; i < 12; i++) {
 415                 if (!(slots & (1 << i)))
 416                         continue;
 417                 reg = get_slot_reg(pcm, cidx, i, dbl);
 418                 switch (reg) {
 419                 case AC97_PCM_FRONT_DAC_RATE:   idx = AC97_RATES_FRONT_DAC; break;
 420                 case AC97_PCM_SURR_DAC_RATE:    idx = AC97_RATES_SURR_DAC; break;
 421                 case AC97_PCM_LFE_DAC_RATE:     idx = AC97_RATES_LFE_DAC; break;
 422                 case AC97_PCM_LR_ADC_RATE:      idx = AC97_RATES_ADC; break;
 423                 case AC97_PCM_MIC_ADC_RATE:     idx = AC97_RATES_MIC_ADC; break;
 424                 default:                        idx = AC97_RATES_SPDIF; break;
 425                 }
 426                 rates &= pcm->r[dbl].codec[cidx]->rates[idx];
 427         }
 428         if (!dbl)
 429                 rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
 430                            SNDRV_PCM_RATE_96000);
 431         return rates;
 432 }
 433
 434 /**
 435  * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
 436  * @bus: the ac97 bus instance
 437  * @pcms_count: count of PCMs to be assigned
 438  * @pcms: PCMs to be assigned
 439  *
 440  * It assigns available AC97 slots for given PCMs. If none or only
 441  * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
 442  * are reduced and might be zero.
 443  */
 444 int snd_ac97_pcm_assign(struct snd_ac97_bus *bus,
 445                         unsigned short pcms_count,
 446                         const struct ac97_pcm *pcms)
 447 {
 448         int i, j, k;
 449         const struct ac97_pcm *pcm;
 450         struct ac97_pcm *rpcms, *rpcm;
 451         unsigned short avail_slots[2][4];
 452         unsigned char rate_table[2][4];
 453         unsigned short tmp, slots;
 454         unsigned short spdif_slots[4];
 455         unsigned int rates;
 456         struct snd_ac97 *codec;
 457
 458         rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
 459         if (rpcms == NULL)
 460                 return -ENOMEM;
 461         memset(avail_slots, 0, sizeof(avail_slots));
 462         memset(rate_table, 0, sizeof(rate_table));
 463         memset(spdif_slots, 0, sizeof(spdif_slots));
 464         for (i = 0; i < 4; i++) {
 465                 codec = bus->codec[i];
 466                 if (!codec)
 467                         continue;
 468                 avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
 469                 avail_slots[1][i] = get_cslots(codec);
 470                 if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
 471                         for (j = 0; j < i; j++) {
 472                                 if (bus->codec[j])
 473                                         avail_slots[1][i] &= ~avail_slots[1][j];
 474                         }
 475                 }
 476         }
 477         /* first step - exclusive devices */
 478         for (i = 0; i < pcms_count; i++) {
 479                 pcm = &pcms[i];
 480                 rpcm = &rpcms[i];
 481                 /* low-level driver thinks that it's more clever */
 482                 if (pcm->copy_flag) {
 483                         *rpcm = *pcm;
 484                         continue;
 485                 }
 486                 rpcm->stream = pcm->stream;
 487                 rpcm->exclusive = pcm->exclusive;
 488                 rpcm->spdif = pcm->spdif;
 489                 rpcm->private_value = pcm->private_value;
 490                 rpcm->bus = bus;
 491                 rpcm->rates = ~0;
 492                 slots = pcm->r[0].slots;
 493                 for (j = 0; j < 4 && slots; j++) {
 494                         if (!bus->codec[j])
 495                                 continue;
 496                         rates = ~0;
 497                         if (pcm->spdif && pcm->stream == 0)
 498                                 tmp = spdif_slots[j];
 499                         else
 500                                 tmp = avail_slots[pcm->stream][j];
 501                         if (pcm->exclusive) {
 502                                 /* exclusive access */
 503                                 tmp &= slots;
 504                                 for (k = 0; k < i; k++) {
 505                                         if (rpcm->stream == rpcms[k].stream)
 506                                                 tmp &= ~rpcms[k].r[0].rslots[j];
 507                                 }
 508                         } else {
 509                                 /* non-exclusive access */
 510                                 tmp &= pcm->r[0].slots;
 511                         }
 512                         if (tmp) {
 513                                 rpcm->r[0].rslots[j] = tmp;
 514                                 rpcm->r[0].codec[j] = bus->codec[j];
 515                                 rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
 516                                 if (bus->no_vra)
 517                                         rates = SNDRV_PCM_RATE_48000;
 518                                 else
 519                                         rates = get_rates(rpcm, j, tmp, 0);
 520                                 if (pcm->exclusive)
 521                                         avail_slots[pcm->stream][j] &= ~tmp;
 522                         }
 523                         slots &= ~tmp;
 524                         rpcm->r[0].slots |= tmp;
 525                         rpcm->rates &= rates;
 526                 }
 527                 /* for double rate, we check the first codec only */
 528                 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 529                     bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
 530                     rate_table[pcm->stream][0] == 0) {
 531                         tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
 532                               (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
 533                         if ((tmp & pcm->r[1].slots) == tmp) {
 534                                 rpcm->r[1].slots = tmp;
 535                                 rpcm->r[1].rslots[0] = tmp;
 536                                 rpcm->r[1].rate_table[0] = 0;
 537                                 rpcm->r[1].codec[0] = bus->codec[0];
 538                                 if (pcm->exclusive)
 539                                         avail_slots[pcm->stream][0] &= ~tmp;
 540                                 if (bus->no_vra)
 541                                         rates = SNDRV_PCM_RATE_96000;
 542                                 else
 543                                         rates = get_rates(rpcm, 0, tmp, 1);
 544                                 rpcm->rates |= rates;
 545                         }
 546                 }
 547                 if (rpcm->rates == ~0)
 548                         rpcm->rates = 0; /* not used */
 549         }
 550         bus->pcms_count = pcms_count;
 551         bus->pcms = rpcms;
 552         return 0;
 553 }
 554
 555 EXPORT_SYMBOL(snd_ac97_pcm_assign);
 556
 557 /**
 558  * snd_ac97_pcm_open - opens the given AC97 pcm
 559  * @pcm: the ac97 pcm instance
 560  * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
 561  * @cfg: output stream characteristics
 562  * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
 563  *
 564  * It locks the specified slots and sets the given rate to AC97 registers.
 565  */
 566 int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
 567                       enum ac97_pcm_cfg cfg, unsigned short slots)
 568 {
 569         struct snd_ac97_bus *bus;
 570         int i, cidx, r, ok_flag;
 571         unsigned int reg_ok[4] = {0,0,0,0};
 572         unsigned char reg;
 573         int err = 0;
 574
 575         r = rate > 48000;
 576         bus = pcm->bus;
 577         if (cfg == AC97_PCM_CFG_SPDIF) {
 578                 int err;
 579                 for (cidx = 0; cidx < 4; cidx++)
 580                         if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
 581                                 err = set_spdif_rate(bus->codec[cidx], rate);
 582                                 if (err < 0)
 583                                         return err;
 584                         }
 585         }
 586         spin_lock_irq(&pcm->bus->bus_lock);
 587         for (i = 3; i < 12; i++) {
 588                 if (!(slots & (1 << i)))
 589                         continue;
 590                 ok_flag = 0;
 591                 for (cidx = 0; cidx < 4; cidx++) {
 592                         if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
 593                                 spin_unlock_irq(&pcm->bus->bus_lock);
 594                                 err = -EBUSY;
 595                                 goto error;
 596                         }
 597                         if (pcm->r[r].rslots[cidx] & (1 << i)) {
 598                                 bus->used_slots[pcm->stream][cidx] |= (1 << i);
 599                                 ok_flag++;
 600                         }
 601                 }
 602                 if (!ok_flag) {
 603                         spin_unlock_irq(&pcm->bus->bus_lock);
 604                         snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
 605                         err = -EAGAIN;
 606                         goto error;
 607                 }
 608         }
 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         bus = pcm->bus;
 655         spin_lock_irq(&pcm->bus->bus_lock);
 656         for (i = 3; i < 12; i++) {
 657                 if (!(slots & (1 << i)))
 658                         continue;
 659                 for (cidx = 0; cidx < 4; cidx++)
 660                         bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
 661         }
 662         pcm->aslots = 0;
 663         spin_unlock_irq(&pcm->bus->bus_lock);
 664         return 0;
 665 }
 666
 667 EXPORT_SYMBOL(snd_ac97_pcm_close);
 668
 669 static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
 670                                           struct snd_pcm_hw_rule *rule)
 671 {
 672         struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 673         if (channels->min > 2) {
 674                 static const struct snd_interval single_rates = {
 675                         .min = 1,
 676                         .max = 48000,
 677                 };
 678                 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 679                 return snd_interval_refine(rate, &single_rates);
 680         }
 681         return 0;
 682 }
 683
 684 static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
 685                                               struct snd_pcm_hw_rule *rule)
 686 {
 687         struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 688         if (rate->min > 48000) {
 689                 static const struct snd_interval double_rate_channels = {
 690                         .min = 2,
 691                         .max = 2,
 692                 };
 693                 struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 694                 return snd_interval_refine(channels, &double_rate_channels);
 695         }
 696         return 0;
 697 }
 698
 699 /**
 700  * snd_ac97_pcm_double_rate_rules - set double rate constraints
 701  * @runtime: the runtime of the ac97 front playback pcm
 702  *
 703  * Installs the hardware constraint rules to prevent using double rates and
 704  * more than two channels at the same time.
 705  */
 706 int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
 707 {
 708         int err;
 709
 710         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 711                                   double_rate_hw_constraint_rate, NULL,
 712                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 713         if (err < 0)
 714                 return err;
 715         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 716                                   double_rate_hw_constraint_channels, NULL,
 717                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 718         return err;
 719 }
 720
 721 EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);