linux/sound/pci/ac97/ac97_pcm.c
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   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
  43static 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? */
 146static 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
 158static 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
 173static 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 */
 257int 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
 319EXPORT_SYMBOL(snd_ac97_set_rate);
 320
 321static 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
 396static 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
 407static 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 */
 443int 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
 554EXPORT_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 */
 565int 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                for (cidx = 0; cidx < 4; cidx++)
 578                        if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
 579                                err = set_spdif_rate(bus->codec[cidx], rate);
 580                                if (err < 0)
 581                                        return err;
 582                        }
 583        }
 584        spin_lock_irq(&pcm->bus->bus_lock);
 585        for (i = 3; i < 12; i++) {
 586                if (!(slots & (1 << i)))
 587                        continue;
 588                ok_flag = 0;
 589                for (cidx = 0; cidx < 4; cidx++) {
 590                        if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
 591                                spin_unlock_irq(&pcm->bus->bus_lock);
 592                                err = -EBUSY;
 593                                goto error;
 594                        }
 595                        if (pcm->r[r].rslots[cidx] & (1 << i)) {
 596                                bus->used_slots[pcm->stream][cidx] |= (1 << i);
 597                                ok_flag++;
 598                        }
 599                }
 600                if (!ok_flag) {
 601                        spin_unlock_irq(&pcm->bus->bus_lock);
 602                        snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
 603                        err = -EAGAIN;
 604                        goto error;
 605                }
 606        }
 607        pcm->cur_dbl = r;
 608        spin_unlock_irq(&pcm->bus->bus_lock);
 609        for (i = 3; i < 12; i++) {
 610                if (!(slots & (1 << i)))
 611                        continue;
 612                for (cidx = 0; cidx < 4; cidx++) {
 613                        if (pcm->r[r].rslots[cidx] & (1 << i)) {
 614                                reg = get_slot_reg(pcm, cidx, i, r);
 615                                if (reg == 0xff) {
 616                                        snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
 617                                        continue;
 618                                }
 619                                if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
 620                                        continue;
 621                                //printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
 622                                err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
 623                                if (err < 0)
 624                                        snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
 625                                else
 626                                        reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
 627                        }
 628                }
 629        }
 630        pcm->aslots = slots;
 631        return 0;
 632
 633 error:
 634        pcm->aslots = slots;
 635        snd_ac97_pcm_close(pcm);
 636        return err;
 637}
 638
 639EXPORT_SYMBOL(snd_ac97_pcm_open);
 640
 641/**
 642 * snd_ac97_pcm_close - closes the given AC97 pcm
 643 * @pcm: the ac97 pcm instance
 644 *
 645 * It frees the locked AC97 slots.
 646 */
 647int snd_ac97_pcm_close(struct ac97_pcm *pcm)
 648{
 649        struct snd_ac97_bus *bus;
 650        unsigned short slots = pcm->aslots;
 651        int i, cidx;
 652
 653#ifdef CONFIG_SND_AC97_POWER_SAVE
 654        int r = pcm->cur_dbl;
 655        for (i = 3; i < 12; i++) {
 656                if (!(slots & (1 << i)))
 657                        continue;
 658                for (cidx = 0; cidx < 4; cidx++) {
 659                        if (pcm->r[r].rslots[cidx] & (1 << i)) {
 660                                int reg = get_slot_reg(pcm, cidx, i, r);
 661                                snd_ac97_update_power(pcm->r[r].codec[cidx],
 662                                                      reg, 0);
 663                        }
 664                }
 665        }
 666#endif
 667
 668        bus = pcm->bus;
 669        spin_lock_irq(&pcm->bus->bus_lock);
 670        for (i = 3; i < 12; i++) {
 671                if (!(slots & (1 << i)))
 672                        continue;
 673                for (cidx = 0; cidx < 4; cidx++)
 674                        bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
 675        }
 676        pcm->aslots = 0;
 677        pcm->cur_dbl = 0;
 678        spin_unlock_irq(&pcm->bus->bus_lock);
 679        return 0;
 680}
 681
 682EXPORT_SYMBOL(snd_ac97_pcm_close);
 683
 684static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
 685                                          struct snd_pcm_hw_rule *rule)
 686{
 687        struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 688        if (channels->min > 2) {
 689                static const struct snd_interval single_rates = {
 690                        .min = 1,
 691                        .max = 48000,
 692                };
 693                struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 694                return snd_interval_refine(rate, &single_rates);
 695        }
 696        return 0;
 697}
 698
 699static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
 700                                              struct snd_pcm_hw_rule *rule)
 701{
 702        struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 703        if (rate->min > 48000) {
 704                static const struct snd_interval double_rate_channels = {
 705                        .min = 2,
 706                        .max = 2,
 707                };
 708                struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 709                return snd_interval_refine(channels, &double_rate_channels);
 710        }
 711        return 0;
 712}
 713
 714/**
 715 * snd_ac97_pcm_double_rate_rules - set double rate constraints
 716 * @runtime: the runtime of the ac97 front playback pcm
 717 *
 718 * Installs the hardware constraint rules to prevent using double rates and
 719 * more than two channels at the same time.
 720 */
 721int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
 722{
 723        int err;
 724
 725        err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 726                                  double_rate_hw_constraint_rate, NULL,
 727                                  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 728        if (err < 0)
 729                return err;
 730        err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 731                                  double_rate_hw_constraint_channels, NULL,
 732                                  SNDRV_PCM_HW_PARAM_RATE, -1);
 733        return err;
 734}
 735
 736EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);
 737