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ac97_pcm.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *  Universal interface for Audio Codec '97
 *
 *  For more details look to AC '97 component specification revision 2.2
 *  by Intel Corporation (http://developer.intel.com) and to datasheets
 *  for specific codecs.
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/ac97_codec.h>
#include <sound/asoundef.h>
#include "ac97_patch.h"
#include "ac97_id.h"
#include "ac97_local.h"

/*
 *  PCM support
 */

static unsigned char rate_reg_tables[2][4][9] = {
{
  /* standard rates */
  {
      /* 3&4 front, 7&8 rear, 6&9 center/lfe */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 3 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 4 */
      0xff,                   /* slot 5 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 6 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 7 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 8 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 9 */
      0xff,                   /* slot 10 */
      0xff,                   /* slot 11 */
  },
  {
      /* 7&8 front, 6&9 rear, 10&11 center/lfe */
      0xff,                   /* slot 3 */
      0xff,                   /* slot 4 */
      0xff,                   /* slot 5 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 6 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 7 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 8 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 9 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 10 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 11 */
  },
  {
      /* 6&9 front, 10&11 rear, 3&4 center/lfe */
      AC97_PCM_LFE_DAC_RATE,        /* slot 3 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 4 */
      0xff,                   /* slot 5 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 6 */
      0xff,                   /* slot 7 */
      0xff,                   /* slot 8 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 9 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 10 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 11 */
  },
  {
      /* 10&11 front, 3&4 rear, 7&8 center/lfe */
      AC97_PCM_SURR_DAC_RATE,       /* slot 3 */
      AC97_PCM_SURR_DAC_RATE,       /* slot 4 */
      0xff,                   /* slot 5 */
      0xff,                   /* slot 6 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 7 */
      AC97_PCM_LFE_DAC_RATE,        /* slot 8 */
      0xff,                   /* slot 9 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 10 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 11 */
  },
},
{
  /* double rates */
  {
      /* 3&4 front, 7&8 front (t+1) */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 3 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 4 */
      0xff,                   /* slot 5 */
      0xff,                   /* slot 6 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 7 */
      AC97_PCM_FRONT_DAC_RATE,      /* slot 8 */
      0xff,                   /* slot 9 */
      0xff,                   /* slot 10 */
      0xff,                   /* slot 11 */
  },
  {
      /* not specified in the specification */
      0xff,                   /* slot 3 */
      0xff,                   /* slot 4 */
      0xff,                   /* slot 5 */
      0xff,                   /* slot 6 */
      0xff,                   /* slot 7 */
      0xff,                   /* slot 8 */
      0xff,                   /* slot 9 */
      0xff,                   /* slot 10 */
      0xff,                   /* slot 11 */
  },
  {
      0xff,                   /* slot 3 */
      0xff,                   /* slot 4 */
      0xff,                   /* slot 5 */
      0xff,                   /* slot 6 */
      0xff,                   /* slot 7 */
      0xff,                   /* slot 8 */
      0xff,                   /* slot 9 */
      0xff,                   /* slot 10 */
      0xff,                   /* slot 11 */
  },
  {
      0xff,                   /* slot 3 */
      0xff,                   /* slot 4 */
      0xff,                   /* slot 5 */
      0xff,                   /* slot 6 */
      0xff,                   /* slot 7 */
      0xff,                   /* slot 8 */
      0xff,                   /* slot 9 */
      0xff,                   /* slot 10 */
      0xff,                   /* slot 11 */
  }
}};

/* FIXME: more various mappings for ADC? */
static unsigned char rate_cregs[9] = {
      AC97_PCM_LR_ADC_RATE,   /* 3 */
      AC97_PCM_LR_ADC_RATE,   /* 4 */
      0xff,             /* 5 */
      AC97_PCM_MIC_ADC_RATE,  /* 6 */
      0xff,             /* 7 */
      0xff,             /* 8 */
      0xff,             /* 9 */
      0xff,             /* 10 */
      0xff,             /* 11 */
};

static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
                          unsigned short slot, int dbl)
{
      if (slot < 3)
            return 0xff;
      if (slot > 11)
            return 0xff;
      if (pcm->spdif)
            return AC97_SPDIF; /* pseudo register */
      if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
            return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
      else
            return rate_cregs[slot - 3];
}

static int set_spdif_rate(ac97_t *ac97, unsigned short rate)
{
      unsigned short old, bits, reg, mask;
      unsigned int sbits;

      if (! (ac97->ext_id & AC97_EI_SPDIF))
            return -ENODEV;

      /* TODO: double rate support */
      if (ac97->flags & AC97_CS_SPDIF) {
            switch (rate) {
            case 48000: bits = 0; break;
            case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
            default: /* invalid - disable output */
                  snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
                  return -EINVAL;
            }
            reg = AC97_CSR_SPDIF;
            mask = 1 << AC97_SC_SPSR_SHIFT;
      } else {
            if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
                  snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
                  return -EINVAL;
            }
            switch (rate) {
            case 44100: bits = AC97_SC_SPSR_44K; break;
            case 48000: bits = AC97_SC_SPSR_48K; break;
            case 32000: bits = AC97_SC_SPSR_32K; break;
            default: /* invalid - disable output */
                  snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
                  return -EINVAL;
            }
            reg = AC97_SPDIF;
            mask = AC97_SC_SPSR_MASK;
      }

      down(&ac97->reg_mutex);
      old = snd_ac97_read(ac97, reg) & mask;
      if (old != bits) {
            snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
            snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
            /* update the internal spdif bits */
            sbits = ac97->spdif_status;
            if (sbits & IEC958_AES0_PROFESSIONAL) {
                  sbits &= ~IEC958_AES0_PRO_FS;
                  switch (rate) {
                  case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
                  case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
                  case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
                  }
            } else {
                  sbits &= ~(IEC958_AES3_CON_FS << 24);
                  switch (rate) {
                  case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
                  case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
                  case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
                  }
            }
            ac97->spdif_status = sbits;
      }
      snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
      up(&ac97->reg_mutex);
      return 0;
}

/**
 * snd_ac97_set_rate - change the rate of the given input/output.
 * @ac97: the ac97 instance
 * @reg: the register to change
 * @rate: the sample rate to set
 *
 * Changes the rate of the given input/output on the codec.
 * If the codec doesn't support VAR, the rate must be 48000 (except
 * for SPDIF).
 *
 * The valid registers are AC97_PMC_MIC_ADC_RATE,
 * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
 * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
 * if the codec supports them.
 * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
 * status bits.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
int snd_ac97_set_rate(ac97_t *ac97, int reg, unsigned int rate)
{
      int dbl;
      unsigned int tmp;
      
      dbl = rate > 48000;
      if (dbl) {
            if (!(ac97->flags & AC97_DOUBLE_RATE))
                  return -EINVAL;
            if (reg != AC97_PCM_FRONT_DAC_RATE)
                  return -EINVAL;
      }

      switch (reg) {
      case AC97_PCM_MIC_ADC_RATE:
            if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)  /* MIC VRA */
                  if (rate != 48000)
                        return -EINVAL;
            break;
      case AC97_PCM_FRONT_DAC_RATE:
      case AC97_PCM_LR_ADC_RATE:
            if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)  /* VRA */
                  if (rate != 48000 && rate != 96000)
                        return -EINVAL;
            break;
      case AC97_PCM_SURR_DAC_RATE:
            if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
                  return -EINVAL;
            break;
      case AC97_PCM_LFE_DAC_RATE:
            if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
                  return -EINVAL;
            break;
      case AC97_SPDIF:
            /* special case */
            return set_spdif_rate(ac97, rate);
      default:
            return -EINVAL;
      }
      if (dbl)
            rate /= 2;
      tmp = (rate * ac97->bus->clock) / 48000;
      if (tmp > 65535)
            return -EINVAL;
      if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
            snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
                             AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
      snd_ac97_update(ac97, reg, tmp & 0xffff);
      snd_ac97_read(ac97, reg);
      if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE) {
            /* Intel controllers require double rate data to be put in
             * slots 7+8
             */
            snd_ac97_update_bits(ac97, AC97_GENERAL_PURPOSE,
                             AC97_GP_DRSS_MASK,
                             dbl ? AC97_GP_DRSS_78 : 0);
            snd_ac97_read(ac97, AC97_GENERAL_PURPOSE);
      }
      return 0;
}

static unsigned short get_pslots(ac97_t *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
{
      if (!ac97_is_audio(ac97))
            return 0;
      if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
            unsigned short slots = 0;
            if (ac97_is_rev22(ac97)) {
                  /* Note: it's simply emulation of AMAP behaviour */
                  u16 es;
                  es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
                  switch (ac97->addr) {
                  case 1:
                  case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
                  case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
                  }
                  snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
            }
            switch (ac97->addr) {
            case 0:
                  slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
                  if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
                        slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
                  if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
                        slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
                  if (ac97->ext_id & AC97_EI_SPDIF) {
                        if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
                              *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
                        else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
                              *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
                        else
                              *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
                  }
                  *rate_table = 0;
                  break;
            case 1:
            case 2:
                  slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
                  if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
                        slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
                  if (ac97->ext_id & AC97_EI_SPDIF) {
                        if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
                              *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
                        else
                              *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
                  }
                  *rate_table = 1;
                  break;
            case 3:
                  slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
                  if (ac97->ext_id & AC97_EI_SPDIF)
                        *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
                  *rate_table = 2;
                  break;
            }
            return slots;
      } else {
            unsigned short slots;
            slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
            if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
                  slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
            if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
                  slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
            if (ac97->ext_id & AC97_EI_SPDIF) {
                  if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
                        *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
                  else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
                        *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
                  else
                        *spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
            }
            *rate_table = 0;
            return slots;
      }
}

static unsigned short get_cslots(ac97_t *ac97)
{
      unsigned short slots;

      if (!ac97_is_audio(ac97))
            return 0;
      slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
      slots |= (1<<AC97_SLOT_MIC);
      return slots;
}

static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
{
      int i, idx;
      unsigned int rates = ~0;
      unsigned char reg;

      for (i = 3; i < 12; i++) {
            if (!(slots & (1 << i)))
                  continue;
            reg = get_slot_reg(pcm, cidx, i, dbl);
            switch (reg) {
            case AC97_PCM_FRONT_DAC_RATE: idx = AC97_RATES_FRONT_DAC; break;
            case AC97_PCM_SURR_DAC_RATE:  idx = AC97_RATES_SURR_DAC; break;
            case AC97_PCM_LFE_DAC_RATE:   idx = AC97_RATES_LFE_DAC; break;
            case AC97_PCM_LR_ADC_RATE:    idx = AC97_RATES_ADC; break;
            case AC97_PCM_MIC_ADC_RATE:   idx = AC97_RATES_MIC_ADC; break;
            default:                idx = AC97_RATES_SPDIF; break;
            }
            rates &= pcm->r[dbl].codec[cidx]->rates[idx];
      }
      if (!dbl)
            rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
                     SNDRV_PCM_RATE_96000);
      return rates;
}

/**
 * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
 * @bus: the ac97 bus instance
 * @pcms_count: count of PCMs to be assigned
 * @pcms: PCMs to be assigned
 *
 * It assigns available AC97 slots for given PCMs. If none or only
 * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
 * are reduced and might be zero.
 */
int snd_ac97_pcm_assign(ac97_bus_t *bus,
                  unsigned short pcms_count,
                  const struct ac97_pcm *pcms)
{
      int i, j, k;
      const struct ac97_pcm *pcm;
      struct ac97_pcm *rpcms, *rpcm;
      unsigned short avail_slots[2][4];
      unsigned char rate_table[2][4];
      unsigned short tmp, slots;
      unsigned short spdif_slots[4];
      unsigned int rates;
      ac97_t *codec;

      rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
      if (rpcms == NULL)
            return -ENOMEM;
      memset(avail_slots, 0, sizeof(avail_slots));
      memset(rate_table, 0, sizeof(rate_table));
      memset(spdif_slots, 0, sizeof(spdif_slots));
      for (i = 0; i < 4; i++) {
            codec = bus->codec[i];
            if (!codec)
                  continue;
            avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
            avail_slots[1][i] = get_cslots(codec);
            if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
                  for (j = 0; j < i; j++) {
                        if (bus->codec[j])
                              avail_slots[1][i] &= ~avail_slots[1][j];
                  }
            }
      }
      /* first step - exclusive devices */
      for (i = 0; i < pcms_count; i++) {
            pcm = &pcms[i];
            rpcm = &rpcms[i];
            /* low-level driver thinks that it's more clever */
            if (pcm->copy_flag) {
                  *rpcm = *pcm;
                  continue;
            }
            rpcm->stream = pcm->stream;
            rpcm->exclusive = pcm->exclusive;
            rpcm->spdif = pcm->spdif;
            rpcm->private_value = pcm->private_value;
            rpcm->bus = bus;
            rpcm->rates = ~0;
            slots = pcm->r[0].slots;
            for (j = 0; j < 4 && slots; j++) {
                  if (!bus->codec[j])
                        continue;
                  rates = ~0;
                  if (pcm->spdif && pcm->stream == 0)
                        tmp = spdif_slots[j];
                  else
                        tmp = avail_slots[pcm->stream][j];
                  if (pcm->exclusive) {
                        /* exclusive access */
                        tmp &= slots;
                        for (k = 0; k < i; k++) {
                              if (rpcm->stream == rpcms[k].stream)
                                    tmp &= ~rpcms[k].r[0].rslots[j];
                        }
                  } else {
                        /* non-exclusive access */
                        tmp &= pcm->r[0].slots;
                  }
                  if (tmp) {
                        rpcm->r[0].rslots[j] = tmp;
                        rpcm->r[0].codec[j] = bus->codec[j];
                        rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
                        if (bus->no_vra)
                              rates = SNDRV_PCM_RATE_48000;
                        else
                              rates = get_rates(rpcm, j, tmp, 0);
                        if (pcm->exclusive)
                              avail_slots[pcm->stream][j] &= ~tmp;
                  }
                  slots &= ~tmp;
                  rpcm->r[0].slots |= tmp;
                  rpcm->rates &= rates;
            }
            /* for double rate, we check the first codec only */
            if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
                bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
                rate_table[pcm->stream][0] == 0) {
                  tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
                        (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
                  if ((tmp & pcm->r[1].slots) == tmp) {
                        rpcm->r[1].slots = tmp;
                        rpcm->r[1].rslots[0] = tmp;
                        rpcm->r[1].rate_table[0] = 0;
                        rpcm->r[1].codec[0] = bus->codec[0];
                        if (pcm->exclusive)
                              avail_slots[pcm->stream][0] &= ~tmp;
                        if (bus->no_vra)
                              rates = SNDRV_PCM_RATE_96000;
                        else
                              rates = get_rates(rpcm, 0, tmp, 1);
                        rpcm->rates |= rates;
                  }
            }
            if (rpcm->rates == ~0)
                  rpcm->rates = 0; /* not used */
      }
      bus->pcms_count = pcms_count;
      bus->pcms = rpcms;
      return 0;
}

/**
 * snd_ac97_pcm_open - opens the given AC97 pcm
 * @pcm: the ac97 pcm instance
 * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
 * @cfg: output stream characteristics
 * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
 *
 * It locks the specified slots and sets the given rate to AC97 registers.
 */
int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
                  enum ac97_pcm_cfg cfg, unsigned short slots)
{
      ac97_bus_t *bus;
      int i, cidx, r, ok_flag;
      unsigned int reg_ok[4] = {0,0,0,0};
      unsigned char reg;
      int err = 0;

      r = rate > 48000;
      bus = pcm->bus;
      if (cfg == AC97_PCM_CFG_SPDIF) {
            int err;
            for (cidx = 0; cidx < 4; cidx++)
                  if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
                        err = set_spdif_rate(bus->codec[cidx], rate);
                        if (err < 0)
                              return err;
                  }
      }
      spin_lock_irq(&pcm->bus->bus_lock);
      for (i = 3; i < 12; i++) {
            if (!(slots & (1 << i)))
                  continue;
            ok_flag = 0;
            for (cidx = 0; cidx < 4; cidx++) {
                  if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
                        spin_unlock_irq(&pcm->bus->bus_lock);
                        err = -EBUSY;
                        goto error;
                  }
                  if (pcm->r[r].rslots[cidx] & (1 << i)) {
                        bus->used_slots[pcm->stream][cidx] |= (1 << i);
                        ok_flag++;
                  }
            }
            if (!ok_flag) {
                  spin_unlock_irq(&pcm->bus->bus_lock);
                  snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
                  err = -EAGAIN;
                  goto error;
            }
      }
      spin_unlock_irq(&pcm->bus->bus_lock);
      for (i = 3; i < 12; i++) {
            if (!(slots & (1 << i)))
                  continue;
            for (cidx = 0; cidx < 4; cidx++) {
                  if (pcm->r[r].rslots[cidx] & (1 << i)) {
                        reg = get_slot_reg(pcm, cidx, i, r);
                        if (reg == 0xff) {
                              snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
                              continue;
                        }
                        if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
                              continue;
                        //printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
                        err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
                        if (err < 0)
                              snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
                        else
                              reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
                  }
            }
      }
      pcm->aslots = slots;
      return 0;

 error:
      pcm->aslots = slots;
      snd_ac97_pcm_close(pcm);
      return err;
}

/**
 * snd_ac97_pcm_close - closes the given AC97 pcm
 * @pcm: the ac97 pcm instance
 *
 * It frees the locked AC97 slots.
 */
int snd_ac97_pcm_close(struct ac97_pcm *pcm)
{
      ac97_bus_t *bus;
      unsigned short slots = pcm->aslots;
      int i, cidx;

      bus = pcm->bus;
      spin_lock_irq(&pcm->bus->bus_lock);
      for (i = 3; i < 12; i++) {
            if (!(slots & (1 << i)))
                  continue;
            for (cidx = 0; cidx < 4; cidx++)
                  bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
      }
      pcm->aslots = 0;
      spin_unlock_irq(&pcm->bus->bus_lock);
      return 0;
}

static int double_rate_hw_constraint_rate(snd_pcm_hw_params_t *params,
                                snd_pcm_hw_rule_t *rule)
{
      snd_interval_t *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
      if (channels->min > 2) {
            static const snd_interval_t single_rates = {
                  .min = 1,
                  .max = 48000,
            };
            snd_interval_t *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
            return snd_interval_refine(rate, &single_rates);
      }
      return 0;
}

static int double_rate_hw_constraint_channels(snd_pcm_hw_params_t *params,
                                    snd_pcm_hw_rule_t *rule)
{
      snd_interval_t *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
      if (rate->min > 48000) {
            static const snd_interval_t double_rate_channels = {
                  .min = 2,
                  .max = 2,
            };
            snd_interval_t *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
            return snd_interval_refine(channels, &double_rate_channels);
      }
      return 0;
}

/**
 * snd_ac97_pcm_double_rate_rules - set double rate constraints
 * @runtime: the runtime of the ac97 front playback pcm
 *
 * Installs the hardware constraint rules to prevent using double rates and
 * more than two channels at the same time.
 */
int snd_ac97_pcm_double_rate_rules(snd_pcm_runtime_t *runtime)
{
      int err;

      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                          double_rate_hw_constraint_rate, NULL,
                          SNDRV_PCM_HW_PARAM_CHANNELS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
                          double_rate_hw_constraint_channels, NULL,
                          SNDRV_PCM_HW_PARAM_RATE, -1);
      return err;
}

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