[alsa-devel] [PATCH 6/7] M-Audio Fast Track Ultra: Add effect program switch

[Takashi Iwai]

At Mon, 23 Apr 2012 16:37:36 +0200,
Felix Homann wrote:
> 
> 
> Signed-off-by: Felix Homann <linuxaudio at showlabor.de>

Put some more texts here.  Otherwise one can't know what you've done.
For example, you can explain more about what effect is added and how.
Or any current restriction or whatever.


> diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
> index 3adef3e..f751137 100644
> --- a/sound/usb/mixer_quirks.c
> +++ b/sound/usb/mixer_quirks.c
> @@ -574,6 +574,187 @@ static int snd_nativeinstruments_create_mixer(struct usb_mixer_interface *mixer,
>  }
>  
>  /* M-Audio FastTrack Ultra quirks */
> +/* FTU Effect switch */
> +struct snd_ftu_eff_switch_priv_val {
> +	struct usb_mixer_interface *mixer;
> +	int cached_value;
> +	int is_cached;
> +};
> +
> +static int snd_ftu_eff_switch_info(struct snd_kcontrol *kcontrol,
> +					struct snd_ctl_elem_info *uinfo)
> +{
> +	static char *texts[8] = {"Room 1",
> +				 "Room 2",
> +				 "Room 3",
> +				 "Hall 1",
> +				 "Hall 2",
> +				 "Plate",
> +				 "Delay",
> +				 "Echo"
> +	};
> +
> +	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
> +	uinfo->count = 1;
> +	uinfo->value.enumerated.items = 8;
> +	if (uinfo->value.enumerated.item > 7)
> +		uinfo->value.enumerated.item = 7;
> +	strcpy(uinfo->value.enumerated.name,
> +		texts[uinfo->value.enumerated.item]);
> +
> +	return 0;
> +}
> +
> +static int snd_ftu_eff_switch_get(struct snd_kcontrol *kctl,
> +					struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct snd_usb_audio *chip;
> +	struct usb_mixer_interface *mixer;
> +	struct snd_ftu_eff_switch_priv_val *pval;
> +	int err;
> +	unsigned char value[2];
> +
> +	pval = (struct snd_ftu_eff_switch_priv_val *)
> +		kctl->private_value;
> +
> +	if (pval->is_cached) {
> +		ucontrol->value.enumerated.item[0] = pval->cached_value;
> +		return 0;
> +	}
> +
> +	mixer = (struct usb_mixer_interface *) pval->mixer;
> +	if (snd_BUG_ON(!mixer))
> +		return -EINVAL;
> +
> +	chip = (struct snd_usb_audio *) mixer->chip;
> +	if (snd_BUG_ON(!chip))
> +		return -EINVAL;
> +
> +	const int id = 6;
> +	const int validx = 1;
> +	const int val_type = USB_MIXER_S16;
> +
> +	value[0] = 0x00;
> +	value[1] = 0x00;
> +
> +	const int val_len = 2;
> +
> +	err = snd_usb_ctl_msg(chip->dev,
> +			usb_rcvctrlpipe(chip->dev, 0), UAC_GET_CUR,
> +			USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
> +			validx << 8, snd_usb_ctrl_intf(chip) | (id << 8),
> +			value, val_len);
> +	if (err < 0)
> +		return -1;

Return err as is.

> +
> +	ucontrol->value.enumerated.item[0] = value[0];
> +	pval->cached_value = value[0];
> +	pval->is_cached = 1;
> +
> +	return 0;
> +}
> +
> +static int snd_ftu_eff_switch_put(struct snd_kcontrol *kctl,
> +					struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct snd_usb_audio *chip;
> +	struct snd_ftu_eff_switch_priv_val *pval;
> +
> +	struct usb_mixer_interface *mixer;
> +	int changed, cur_val, err, new_val;
> +	unsigned char value[2];
> +
> +	changed = 0;
> +	const int id = 6;
> +	const int validx = 1;
> +	const int val_type = USB_MIXER_S16;
> +	const int val_len = 2;
> +
> +	pval = (struct snd_ftu_eff_switch_priv_val *)
> +		kctl->private_value;
> +	cur_val = pval->cached_value;
> +	new_val = ucontrol->value.enumerated.item[0];
> +
> +	mixer = (struct usb_mixer_interface *) pval->mixer;
> +	if (snd_BUG_ON(!mixer))
> +		return -EINVAL;
> +
> +	chip = (struct snd_usb_audio *) mixer->chip;
> +	if (snd_BUG_ON(!chip))
> +		return -EINVAL;
> +
> +	if (!pval->is_cached) {
> +		/* Read current value */
> +		err = snd_usb_ctl_msg(chip->dev,
> +				usb_rcvctrlpipe(chip->dev, 0), UAC_GET_CUR,
> +				USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
> +				validx << 8, snd_usb_ctrl_intf(chip) | (id << 8),
> +				value, val_len);
> +		if (err < 0)
> +			return -1;

Ditto.

> +
> +		cur_val = value[0];
> +		pval->cached_value = cur_val;
> +		pval->is_cached = 1;
> +	}
> +	/* update value if needed */
> +	if (cur_val != new_val) {
> +		value[0] = new_val;
> +		value[1] = 0;
> +		err = snd_usb_ctl_msg(chip->dev,
> +				usb_sndctrlpipe(chip->dev, 0), UAC_SET_CUR,
> +				USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
> +				validx << 8, snd_usb_ctrl_intf(chip) | (id << 8),
> +				value, val_len);
> +		if (err < 0)
> +			return -1;

Ditto.

> +
> +		pval->cached_value = new_val;
> +		pval->is_cached = 1;
> +		changed = 1;
> +	}
> +
> +	return changed;
> +}
> +
> +static int snd_ftu_create_effect_switch(struct usb_mixer_interface *mixer)
> +{
> +	static struct snd_kcontrol_new template = {
> +		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
> +		.name = "Effect Program Switch",
> +		.index = 0,
> +		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
> +		.info = snd_ftu_eff_switch_info,
> +		.get = snd_ftu_eff_switch_get,
> +		.put = snd_ftu_eff_switch_put
> +	};
> +

Avoid the unnecessary blank line.

> +	int err;
> +	struct snd_kcontrol *kctl;
> +	struct snd_ftu_eff_switch_priv_val *pval;
> +
> +	pval = kzalloc(sizeof(*pval), GFP_KERNEL);
> +	if (!pval)
> +		return -ENOMEM;
> +
> +	pval->cached_value = 0;
> +	pval->is_cached = 0;
> +	pval->mixer = mixer;
> +
> +	template.private_value = (unsigned long) pval;
> +	kctl = snd_ctl_new1(&template, mixer->chip);
> +	if (!kctl) {
> +		kfree(pval);
> +		return -ENOMEM;
> +	}
> +
> +	err = snd_ctl_add(mixer->chip->card, kctl);
> +	if (err < 0)
> +		return err;
> +
> +	return 0;
> +}
> +
>  
>  /* Create volume controls for FTU devices*/
>  static int snd_ftu_create_volume_ctls(struct usb_mixer_interface *mixer)
> @@ -622,6 +803,10 @@ static int snd_ftu_create_mixer(struct usb_mixer_interface *mixer)
>  	if (err < 0)
>  		return err;
>  
> +	err = snd_ftu_create_effect_switch(mixer);
> +	if (err < 0)
> +		return err;
> +
>  	return 0;
>  }
>  
> -- 
> 1.7.5.4
>