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