pcsp_mixer.c

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/*
 * PC-Speaker driver for Linux
 *
 * Mixer implementation.
 * Copyright (C) 2001-2008  Stas Sergeev
 */

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


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_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, "%lu",
        (unsigned long)PCSP_CALC_RATE(uinfo->value.enumerated.item));
    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)
{
    struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
    int changed = 0;
    int treble = ucontrol->value.enumerated.item[0];
    if (treble != chip->treble) {
        chip->treble = treble;
#if PCSP_DEBUG
        printk(KERN_INFO "PCSP: rate set to %li\n", PCSP_RATE());
#endif
        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 __devinitdata snd_pcsp_controls_pcm[] = {
    PCSP_MIXER_CONTROL(enable, "Master Playback Switch"),
    PCSP_MIXER_CONTROL(treble, "BaseFRQ Playback Volume"),
};

static struct snd_kcontrol_new __devinitdata snd_pcsp_controls_spkr[] = {
    PCSP_MIXER_CONTROL(pcspkr, "Beep Playback Switch"),
};

static int __devinit snd_pcsp_ctls_add(struct snd_pcsp *chip,
    struct snd_kcontrol_new *ctls, int num)
{
    int i, err;
    struct snd_card *card = chip->card;
    for (i = 0; i < num; i++) {
        err = snd_ctl_add(card, snd_ctl_new1(ctls + i, chip));
        if (err < 0)
            return err;
    }
    return 0;
}

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

    if (!nopcm) {
        err = snd_pcsp_ctls_add(chip, snd_pcsp_controls_pcm,
            ARRAY_SIZE(snd_pcsp_controls_pcm));
        if (err < 0)
            return err;
    }
    err = snd_pcsp_ctls_add(chip, snd_pcsp_controls_spkr,
        ARRAY_SIZE(snd_pcsp_controls_spkr));
    if (err < 0)
        return err;

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

    return 0;
}