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pcxhr_mixer.c

#define __NO_VERSION__
/*
 * Driver for Digigram pcxhr compatible soundcards
 *
 * mixer callbacks
 *
 * Copyright (c) 2004 by Digigram <alsa@digigram.com>
 *
 *   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/time.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <sound/core.h>
#include "pcxhr.h"
#include "pcxhr_hwdep.h"
#include "pcxhr_core.h"
#include <sound/control.h>
#include "pcxhr_mixer.h"


#define PCXHR_ANALOG_CAPTURE_LEVEL_MIN   0      /* -96.0 dB */
#define PCXHR_ANALOG_CAPTURE_LEVEL_MAX   255    /* +31.5 dB */
#define PCXHR_ANALOG_CAPTURE_ZERO_LEVEL  224    /* +16.0 dB ( +31.5 dB - fix level +15.5 dB ) */

#define PCXHR_ANALOG_PLAYBACK_LEVEL_MIN  0      /* -128.0 dB */
#define PCXHR_ANALOG_PLAYBACK_LEVEL_MAX  128    /*    0.0 dB */
#define PCXHR_ANALOG_PLAYBACK_ZERO_LEVEL 104    /*  -24.0 dB ( 0.0 dB - fix level +24.0 dB ) */

static int pcxhr_update_analog_audio_level(pcxhr_t* chip, int is_capture, int channel)
{
      int err, vol;
      pcxhr_rmh_t rmh;

      pcxhr_init_rmh(&rmh, CMD_ACCESS_IO_WRITE);
      if(is_capture) {
            rmh.cmd[0] |= IO_NUM_REG_IN_ANA_LEVEL;
            rmh.cmd[2] = chip->analog_capture_volume[channel];
      } else {
            rmh.cmd[0] |= IO_NUM_REG_OUT_ANA_LEVEL;
            if(chip->analog_playback_active[channel])
                  vol = chip->analog_playback_volume[channel];
            else
                  vol = PCXHR_ANALOG_PLAYBACK_LEVEL_MIN;
            rmh.cmd[2] = PCXHR_ANALOG_PLAYBACK_LEVEL_MAX - vol;   /* playback analog levels are inversed */
      }
      rmh.cmd[1]  = 1 << ((2 * chip->chip_idx) + channel);  /* audio mask */
      rmh.cmd_len = 3;
      err = pcxhr_send_msg(chip->mgr, &rmh);
      if(err<0) {
            snd_printk(KERN_DEBUG "error update_analog_audio_level card(%d) is_capture(%d) err(%x)\n", chip->chip_idx, is_capture, err);
            return -EINVAL;
      }
      return 0;
}

/*
 * analog level control
 */
static int pcxhr_analog_vol_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      if(kcontrol->private_value == 0) {  /* playback */
            uinfo->value.integer.min = PCXHR_ANALOG_PLAYBACK_LEVEL_MIN; /* -128 dB */
            uinfo->value.integer.max = PCXHR_ANALOG_PLAYBACK_LEVEL_MAX; /* 0 dB */
      } else {                      /* capture */
            uinfo->value.integer.min = PCXHR_ANALOG_CAPTURE_LEVEL_MIN;  /* -96 dB */
            uinfo->value.integer.max = PCXHR_ANALOG_CAPTURE_LEVEL_MAX;  /* 31.5 dB */
      }
      return 0;
}

static int pcxhr_analog_vol_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      down(&chip->mgr->mixer_mutex);
      if(kcontrol->private_value == 0) {  /* playback */
            ucontrol->value.integer.value[0] = chip->analog_playback_volume[0];
            ucontrol->value.integer.value[1] = chip->analog_playback_volume[1];
      } else {                      /* capture */
            ucontrol->value.integer.value[0] = chip->analog_capture_volume[0];
            ucontrol->value.integer.value[1] = chip->analog_capture_volume[1];
      }
      up(&chip->mgr->mixer_mutex);
      return 0;
}

static int pcxhr_analog_vol_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int is_capture, i;

      down(&chip->mgr->mixer_mutex);
      is_capture = (kcontrol->private_value != 0);
      for(i=0; i<2; i++) {
            int  new_volume = ucontrol->value.integer.value[i];
            int* stored_volume = is_capture ? &chip->analog_capture_volume[i] : &chip->analog_playback_volume[i];
            if(*stored_volume != new_volume) {
                  *stored_volume = new_volume;
                  changed = 1;
                  pcxhr_update_analog_audio_level(chip, is_capture, i);
            }
      }
      up(&chip->mgr->mixer_mutex);
      return changed;
}

static snd_kcontrol_new_t pcxhr_control_analog_level = {
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
      /* name will be filled later */
      .info =           pcxhr_analog_vol_info,
      .get =            pcxhr_analog_vol_get,
      .put =            pcxhr_analog_vol_put,
};

/* shared */
static int pcxhr_sw_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int pcxhr_audio_sw_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);

      down(&chip->mgr->mixer_mutex);
      ucontrol->value.integer.value[0] = chip->analog_playback_active[0];
      ucontrol->value.integer.value[1] = chip->analog_playback_active[1];
      up(&chip->mgr->mixer_mutex);
      return 0;
}

static int pcxhr_audio_sw_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int i, changed = 0;
      down(&chip->mgr->mixer_mutex);
      for(i=0; i<2; i++) {
            if(chip->analog_playback_active[i] != ucontrol->value.integer.value[i]) {
                  chip->analog_playback_active[i] = ucontrol->value.integer.value[i];
                  changed = 1;
                  pcxhr_update_analog_audio_level(chip, 0, i);    /* update playback levels */
            }
      }
      up(&chip->mgr->mixer_mutex);
      return changed;
}

static snd_kcontrol_new_t pcxhr_control_output_switch = {
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
      .name =           "Master Playback Switch",
      .info =           pcxhr_sw_info,          /* shared */
      .get =            pcxhr_audio_sw_get,
      .put =            pcxhr_audio_sw_put
};


#define PCXHR_DIGITAL_LEVEL_MIN           0x000 /* -110 dB */
#define PCXHR_DIGITAL_LEVEL_MAX           0x1ff /* +18 dB */
#define PCXHR_DIGITAL_ZERO_LEVEL    0x1b7 /*  0 dB */


#define MORE_THAN_ONE_STREAM_LEVEL  0x000001
#define VALID_STREAM_PAN_LEVEL_MASK 0x800000
#define VALID_STREAM_LEVEL_MASK           0x400000
#define VALID_STREAM_LEVEL_1_MASK   0x200000
#define VALID_STREAM_LEVEL_2_MASK   0x100000

int pcxhr_update_playback_stream_level(pcxhr_t* chip, int idx)
{
      int err;
      pcxhr_rmh_t rmh;
      pcxhr_pipe_t *pipe = &chip->playback_pipe;
      int left, right;

      /* do only when pipe exists ! */
      if(pipe->status == PCXHR_PIPE_UNDEFINED)
            return 0;

      if(chip->digital_playback_active[idx][0]) left = chip->digital_playback_volume[idx][0];
      else                                left = PCXHR_DIGITAL_LEVEL_MIN;
      if(chip->digital_playback_active[idx][1]) right = chip->digital_playback_volume[idx][1];
      else                                right = PCXHR_DIGITAL_LEVEL_MIN;

      pcxhr_init_rmh(&rmh, CMD_STREAM_OUT_LEVEL_ADJUST);
      pcxhr_set_pipe_cmd_params(&rmh, 0, pipe->first_audio, 0, 1<<idx); /* add pipe and stream mask */
      /* volume left->left / right->right panoramic level */
      rmh.cmd[0] |= MORE_THAN_ONE_STREAM_LEVEL;
      rmh.cmd[2]  = VALID_STREAM_PAN_LEVEL_MASK | VALID_STREAM_LEVEL_1_MASK;
      rmh.cmd[2] |= (left << 10);
      rmh.cmd[3]  = VALID_STREAM_PAN_LEVEL_MASK | VALID_STREAM_LEVEL_2_MASK;
      rmh.cmd[3] |= right;
      rmh.cmd_len = 4;

      err = pcxhr_send_msg(chip->mgr, &rmh);
      if(err<0) {
            snd_printk(KERN_DEBUG "error update_playback_stream_level card(%d) err(%x)\n", chip->chip_idx, err);
            return -EINVAL;
      }
      return 0;
}

#define AUDIO_IO_HAS_MUTE_LEVEL           0x400000
#define AUDIO_IO_HAS_MUTE_MONITOR_1 0x200000
#define VALID_AUDIO_IO_DIGITAL_LEVEL      0x000001
#define VALID_AUDIO_IO_MONITOR_LEVEL      0x000002
#define VALID_AUDIO_IO_MUTE_LEVEL   0x000004
#define VALID_AUDIO_IO_MUTE_MONITOR_1     0x000008

int pcxhr_update_audio_pipe_level(pcxhr_t* chip, int capture, int channel)
{
      int err;
      pcxhr_rmh_t rmh;
      pcxhr_pipe_t *pipe;

      if(capture) pipe = &chip->capture_pipe[0];
      else        pipe = &chip->playback_pipe;
      /* only when pipe exists ! */
      if(pipe->status == PCXHR_PIPE_UNDEFINED)
            return 0;

      pcxhr_init_rmh(&rmh, CMD_AUDIO_LEVEL_ADJUST);
      pcxhr_set_pipe_cmd_params(&rmh, capture, 0, 0, 1 << (channel + pipe->first_audio)); /* add channel mask */
      /* TODO : if mask (3 << pipe->first_audio) is used, left and right channel will be programmed to the same params */
      if(capture) {
            rmh.cmd[0] |= VALID_AUDIO_IO_DIGITAL_LEVEL;
            /* VALID_AUDIO_IO_MUTE_LEVEL not yet handled (capture pipe level) */
            rmh.cmd[2] = chip->digital_capture_volume[channel];
      } else {
            rmh.cmd[0] |= VALID_AUDIO_IO_MONITOR_LEVEL | VALID_AUDIO_IO_MUTE_MONITOR_1;
            /* VALID_AUDIO_IO_DIGITAL_LEVEL and VALID_AUDIO_IO_MUTE_LEVEL not yet handled (playback pipe level) */
            rmh.cmd[2] = chip->monitoring_volume[channel] << 10;
            if(chip->monitoring_active[channel] == 0)
                  rmh.cmd[2] |= AUDIO_IO_HAS_MUTE_MONITOR_1;
      }
      rmh.cmd_len = 3;

      err = pcxhr_send_msg(chip->mgr, &rmh);
      if(err<0) {
            snd_printk(KERN_DEBUG "error update_audio_level card(%d) err(%x)\n", chip->chip_idx, err);
            return -EINVAL;
      }
      return 0;
}


/* shared */
static int pcxhr_digital_vol_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      uinfo->value.integer.min = PCXHR_DIGITAL_LEVEL_MIN;   /* -109.5 dB */
      uinfo->value.integer.max = PCXHR_DIGITAL_LEVEL_MAX;   /*   18.0 dB */
      return 0;
}


static int pcxhr_pcm_vol_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);           /* index */
      int *stored_volume;
      int is_capture = kcontrol->private_value;
      down(&chip->mgr->mixer_mutex);
      if(is_capture) {
            stored_volume = chip->digital_capture_volume;         /* digital capture */
      } else {
            snd_assert ( idx < PCXHR_PLAYBACK_STREAMS ); 
            stored_volume = chip->digital_playback_volume[idx];   /* digital playback */
      }
      ucontrol->value.integer.value[0] = stored_volume[0];
      ucontrol->value.integer.value[1] = stored_volume[1];
      up(&chip->mgr->mixer_mutex);
      return 0;
}

static int pcxhr_pcm_vol_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);           /* index */
      int changed = 0;
      int is_capture = kcontrol->private_value;
      int* stored_volume;
      int i;
      down(&chip->mgr->mixer_mutex);
      if(is_capture) {
            stored_volume = chip->digital_capture_volume;         /* digital capture */
      } else {
            snd_assert ( idx < PCXHR_PLAYBACK_STREAMS ); 
            stored_volume = chip->digital_playback_volume[idx];   /* digital playback */
      }
      for(i=0; i<2; i++) {
            if(stored_volume[i] != ucontrol->value.integer.value[i]) {
                  stored_volume[i] = ucontrol->value.integer.value[i];
                  changed = 1;
                  if(is_capture)    pcxhr_update_audio_pipe_level(chip, 1, i);      /* update capture volume */
            }
      }
      if((!is_capture) && changed)  pcxhr_update_playback_stream_level(chip, idx);  /* update playback volume */
      up(&chip->mgr->mixer_mutex);
      return changed;
}

static snd_kcontrol_new_t snd_pcxhr_pcm_vol =
{
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
      /* name will be filled later */
      /* count will be filled later */
      .info =           pcxhr_digital_vol_info,       /* shared */
      .get =            pcxhr_pcm_vol_get,
      .put =            pcxhr_pcm_vol_put,
};


static int pcxhr_pcm_sw_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id); /* index */
      snd_assert ( idx < PCXHR_PLAYBACK_STREAMS ); 
      down(&chip->mgr->mixer_mutex);
      ucontrol->value.integer.value[0] = chip->digital_playback_active[idx][0];
      ucontrol->value.integer.value[1] = chip->digital_playback_active[idx][1];
      up(&chip->mgr->mixer_mutex);
      return 0;
}

static int pcxhr_pcm_sw_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id); /* index */
      int i, j;
      snd_assert ( idx < PCXHR_PLAYBACK_STREAMS ); 
      down(&chip->mgr->mixer_mutex);
      j = idx;
      for(i=0; i<2; i++) {
            if(chip->digital_playback_active[j][i] != ucontrol->value.integer.value[i]) {
                  chip->digital_playback_active[j][i] = ucontrol->value.integer.value[i];
                  changed = 1;
            }
      }
      if(changed) pcxhr_update_playback_stream_level(chip, idx);
      up(&chip->mgr->mixer_mutex);
      return changed;
}

static snd_kcontrol_new_t pcxhr_control_pcm_switch = {
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
      /* name will be filled later */
      .count =    PCXHR_PLAYBACK_STREAMS,
      .info =           pcxhr_sw_info,          /* shared */
      .get =            pcxhr_pcm_sw_get,
      .put =            pcxhr_pcm_sw_put
};


/*
 * monitoring level control
 */

static int pcxhr_monitor_vol_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      down(&chip->mgr->mixer_mutex);
      ucontrol->value.integer.value[0] = chip->monitoring_volume[0];
      ucontrol->value.integer.value[1] = chip->monitoring_volume[1];
      up(&chip->mgr->mixer_mutex);
      return 0;
}

static int pcxhr_monitor_vol_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int i;
      down(&chip->mgr->mixer_mutex);
      for(i=0; i<2; i++) {
            if(chip->monitoring_volume[i] != ucontrol->value.integer.value[i]) {
                  chip->monitoring_volume[i] = ucontrol->value.integer.value[i];
                  if(chip->monitoring_active[i])                        /* do only when monitoring is unmuted : */
                        pcxhr_update_audio_pipe_level(chip, 0, i);      /* update monitoring volume and mute */
                  changed = 1;
            }
      }
      up(&chip->mgr->mixer_mutex);
      return changed;
}

static snd_kcontrol_new_t pcxhr_control_monitor_vol = {
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
      .name =         "Monitoring Volume",
      .info =           pcxhr_digital_vol_info,       /* shared */
      .get =            pcxhr_monitor_vol_get,
      .put =            pcxhr_monitor_vol_put,
};

/*
 * monitoring switch control
 */

static int pcxhr_monitor_sw_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      down(&chip->mgr->mixer_mutex);
      ucontrol->value.integer.value[0] = chip->monitoring_active[0];
      ucontrol->value.integer.value[1] = chip->monitoring_active[1];
      up(&chip->mgr->mixer_mutex);
      return 0;
}

static int pcxhr_monitor_sw_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pcxhr_t *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int i;
      down(&chip->mgr->mixer_mutex);
      for(i=0; i<2; i++) {
            if(chip->monitoring_active[i] != ucontrol->value.integer.value[i]) {
                  chip->monitoring_active[i] = ucontrol->value.integer.value[i];
                  changed |= (1<<i); /* mask 0x01 and 0x02 */
            }
      }
      if(changed & 0x01)      pcxhr_update_audio_pipe_level(chip, 0, 0);      /* update left monitoring volume and mute */
      if(changed & 0x02)      pcxhr_update_audio_pipe_level(chip, 0, 1);      /* update right monitoring volume and mute */

      up(&chip->mgr->mixer_mutex);
      return (changed != 0);
}

static snd_kcontrol_new_t pcxhr_control_monitor_sw = {
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER,
      .name =         "Monitoring Switch",
      .info =         pcxhr_sw_info,            /* shared */
      .get =          pcxhr_monitor_sw_get,
      .put =          pcxhr_monitor_sw_put
};


static void pcxhr_reset_audio_levels(pcxhr_t *chip)
{
      int i;
/* only for test purpose, remove later */
#ifdef CONFIG_SND_DEBUG
      for(i=0; i<2; i++) {
            int j;
            chip->analog_capture_volume[i]  = PCXHR_ANALOG_CAPTURE_ZERO_LEVEL;
            chip->analog_playback_active[i] = 1;
            chip->analog_playback_volume[i] = PCXHR_ANALOG_PLAYBACK_ZERO_LEVEL;
            for(j=0; j<PCXHR_PLAYBACK_STREAMS; j++) {
                  chip->digital_playback_active[j][i] = 1;
                  chip->digital_playback_volume[j][i] = PCXHR_DIGITAL_ZERO_LEVEL;
            }
            chip->digital_capture_volume[i] = PCXHR_DIGITAL_ZERO_LEVEL;
            chip->monitoring_active[i] = 0;
            chip->monitoring_volume[i] = PCXHR_DIGITAL_ZERO_LEVEL;
      }
#endif
/* test end */
      for(i=0; i<2; i++) {
/* only for test purpose, remove later */
#ifdef CONFIG_SND_DEBUG
            /* analog volumes for playback (already is LEVEL_MIN after boot) */
            if(chip->nb_streams_play)     pcxhr_update_analog_audio_level(chip, 0, i);
            /* analog levels for capture (already is LEVEL_MIN after boot) */
            if(chip->nb_streams_capt)     pcxhr_update_analog_audio_level(chip, 1, i);
#endif
/* test end */
            /* digital capture level (default is 0dB unmuted after capture pipe allocation) */
            if(chip->nb_streams_capt)     pcxhr_update_audio_pipe_level(chip, 1, i);
            /* digital monitoring level (default is 0dB after playback pipe allocation, but muted!) */
            /* pcxhr_update_audio_pipe_level(chip, 0, i); */ /* no need to update */
      }
      if(chip->nb_streams_play) {
            for(i=0; i<PCXHR_PLAYBACK_STREAMS; i++) {
                  /* digital playback stream levels (default is 0dB unmuted after pipe allocation) */
                  pcxhr_update_playback_stream_level(chip, i);
            }
      }

      return;
}


int pcxhr_create_mixer(pcxhr_mgr_t *mgr)
{
      pcxhr_t *chip;
      int err, i;

      init_MUTEX(&mgr->mixer_mutex); /* can be in another place */

      for(i=0; i<mgr->num_cards; i++) {
            snd_kcontrol_new_t temp;
            chip = mgr->chip[i];

            if(chip->nb_streams_play) {
                  /* analog output level control */
                  temp = pcxhr_control_analog_level;
                  temp.name = "Master Playback Volume";
                  temp.private_value = 0; /* playback */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&temp, chip))) < 0)
                        return err;
                  /* output mute controls */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&pcxhr_control_output_switch, chip))) < 0)
                        return err;

                  temp = snd_pcxhr_pcm_vol;
                  temp.name = "PCM Playback Volume";
                  temp.count = PCXHR_PLAYBACK_STREAMS;
                  temp.private_value = 0; /* playback */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&temp, chip))) < 0)
                        return err;

                  temp = pcxhr_control_pcm_switch;
                  temp.name = "PCM Playback Switch";
                  temp.private_value = 0; /* playback */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&temp, chip))) < 0)
                        return err;
            }
            if(chip->nb_streams_capt) {
                  /* analog input level control only on first two chips !*/
                  temp = pcxhr_control_analog_level;
                  temp.name = "Master Capture Volume";
                  temp.private_value = 1; /* capture */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&temp, chip))) < 0)
                        return err;

                  temp = snd_pcxhr_pcm_vol;
                  temp.name = "PCM Capture Volume";
                  temp.count = 1;
                  temp.private_value = 1; /* capture */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&temp, chip))) < 0)
                        return err;
            }
            /* monitoring only if playback and capture device available */
            if((chip->nb_streams_capt>0) && (chip->nb_streams_play>0)) {
                  /* monitoring */
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&pcxhr_control_monitor_vol, chip))) < 0)
                        return err;
                  if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&pcxhr_control_monitor_sw, chip))) < 0)
                        return err;
            }

            /* init all mixer data and program the master volumes/switches */
            pcxhr_reset_audio_levels(chip);
      }
      return 0;
}

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