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pcsp_mixer.c

/*
 * PC-Speaker driver for Linux
 *
 * Mixer implementation.
 * Copyright (C) 2001-2004  Stas Sergeev
 */

#include <sound/driver.h>
#include <sound/core.h>
#include <sound/control.h>
#include "pcsp.h"
#include "pcsp_tabs.h"

/*
   calculate a translation-table for PC-Speaker
*/
void pcsp_calc_voltab(struct snd_pcsp *chip)
{
      int i;
      unsigned int j;
      for (i = 0; i < 256; i++) {
            j = (((pcsp_tabs[chip->gain][i] - 128)
                      * (signed)chip->volume) / PCSP_MAX_VOLUME) + 128;
            chip->vl_tab[i] = j * MIN_DIV / 256;
      }
}

static int pcsp_volume_info(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = PCSP_MAX_VOLUME;
      return 0;
}

static int pcsp_volume_get(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = chip->volume;
      return 0;
}

static int pcsp_volume_put(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      unsigned long flags;
      int changed = 0;
      int vol = ucontrol->value.integer.value[0];
      if (vol != chip->volume) {
            spin_lock_irqsave(&chip->lock, flags);
            chip->volume = vol;
            pcsp_calc_voltab(chip);
            spin_unlock_irqrestore(&chip->lock, flags);
            changed = 1;
      }
      return changed;
}

static int pcsp_enable_info(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int pcsp_enable_get(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = chip->enable;
      return 0;
}

static int pcsp_enable_put(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int enab = ucontrol->value.integer.value[0];
      if (enab != chip->enable) {
            chip->enable = enab;
            changed = 1;
      }
      return changed;
}

static int pcsp_gain_info(struct snd_kcontrol *kcontrol,
                    struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = pcsp_max_gain;
      return 0;
}

static int pcsp_gain_get(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = chip->gain;
      return 0;
}

static int pcsp_gain_put(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      unsigned long flags;
      int changed = 0;
      int gain = ucontrol->value.integer.value[0];
      if (gain != chip->gain) {
            spin_lock_irqsave(&chip->lock, flags);
            chip->gain = gain;
            pcsp_calc_voltab(chip);
            spin_unlock_irqrestore(&chip->lock, flags);
            changed = 1;
      }
      return changed;
}

static int pcsp_treble_info(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = chip->max_treble + 1;
      if (uinfo->value.enumerated.item > chip->max_treble)
            uinfo->value.enumerated.item = chip->max_treble;
      sprintf(uinfo->value.enumerated.name, "%d", PCSP_RATE);
      return 0;
}

static int pcsp_treble_get(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.enumerated.item[0] = chip->treble;
      return 0;
}

static int pcsp_treble_put(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      unsigned long flags;
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int treble = ucontrol->value.enumerated.item[0];
      if (treble != chip->treble) {
            spin_lock_irqsave(&chip->lock, flags);
            chip->treble = treble;
            chip->reset_timer = 1;
            pcsp_calc_voltab(chip);
            spin_unlock_irqrestore(&chip->lock, flags);
            changed = 1;
      }
      return changed;
}

static int pcsp_pcspkr_info(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int pcsp_pcspkr_get(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = chip->pcspkr;
      return 0;
}

static int pcsp_pcspkr_put(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
      struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
      int changed = 0;
      int spkr = ucontrol->value.integer.value[0];
      if (spkr != chip->pcspkr) {
            chip->pcspkr = spkr;
            changed = 1;
      }
      return changed;
}

#define PCSP_MIXER_CONTROL(ctl_type, ctl_name) \
{ \
      .iface =    SNDRV_CTL_ELEM_IFACE_MIXER, \
      .name =           ctl_name, \
      .info =           pcsp_##ctl_type##_info, \
      .get =            pcsp_##ctl_type##_get, \
      .put =            pcsp_##ctl_type##_put, \
}

static struct snd_kcontrol_new __initdata snd_pcsp_controls[] = {
      PCSP_MIXER_CONTROL(volume, "Master Playback Volume"),
      PCSP_MIXER_CONTROL(enable, "Master Playback Switch"),
      PCSP_MIXER_CONTROL(gain, "PCM Playback Volume"),
      PCSP_MIXER_CONTROL(treble, "BaseFRQ Playback Volume"),
      PCSP_MIXER_CONTROL(pcspkr, "PC Speaker Playback Switch"),
};

int __init snd_pcsp_new_mixer(struct snd_pcsp *chip)
{
      struct snd_card *card = chip->card;
      int i, err;

      for (i = 0; i < ARRAY_SIZE(snd_pcsp_controls); i++) {
            if ((err = snd_ctl_add(card, snd_ctl_new1(
                        snd_pcsp_controls + i, chip))) < 0)
                  return err;
      }

      strcpy(card->mixername, "PC-Speaker");

      return 0;
}

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