linux-kernel - Re: [PATCH v3 1/2] ALSA: usb-audio: Carve out connector value checking into a helper

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Date:   Fri, 26 Mar 2021 09:11:10 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     tiwai@...e.com, Jaroslav Kysela <perex@...ex.cz>,
        Joe Perches <joe@...ches.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Mark Brown <broonie@...nel.org>, Tom Yan <tom.ty89@...il.com>,
        Chris Chiu <chiu@...lessm.com>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH v3 1/2] ALSA: usb-audio: Carve out connector value checking into a helper

On Thu, 25 Mar 2021 17:59:12 +0100,
Kai-Heng Feng wrote:
> 
> This is preparation for next patch, no functional change intended.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Applied now.  Thanks.


Takashi

> ---
> v3:
>  - No change.
> v2:
>  - Only return early when ret < 0.
> 
>  sound/usb/mixer.c | 34 +++++++++++++++++++++++++---------
>  1 file changed, 25 insertions(+), 9 deletions(-)
> 
> diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
> index b004b2e63a5d..5a2d9a768f70 100644
> --- a/sound/usb/mixer.c
> +++ b/sound/usb/mixer.c
> @@ -1446,13 +1446,11 @@ static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
>  	return 0;
>  }
>  
> -/* get the connectors status and report it as boolean type */
> -static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
> -				   struct snd_ctl_elem_value *ucontrol)
> +static int get_connector_value(struct usb_mixer_elem_info *cval,
> +			       char *name, int *val)
>  {
> -	struct usb_mixer_elem_info *cval = kcontrol->private_data;
>  	struct snd_usb_audio *chip = cval->head.mixer->chip;
> -	int idx = 0, validx, ret, val;
> +	int idx = 0, validx, ret;
>  
>  	validx = cval->control << 8 | 0;
>  
> @@ -1467,21 +1465,24 @@ static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
>  		ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
>  				      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
>  				      validx, idx, &uac2_conn, sizeof(uac2_conn));
> -		val = !!uac2_conn.bNrChannels;
> +		if (val)
> +			*val = !!uac2_conn.bNrChannels;
>  	} else { /* UAC_VERSION_3 */
>  		struct uac3_insertion_ctl_blk uac3_conn;
>  
>  		ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
>  				      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
>  				      validx, idx, &uac3_conn, sizeof(uac3_conn));
> -		val = !!uac3_conn.bmConInserted;
> +		if (val)
> +			*val = !!uac3_conn.bmConInserted;
>  	}
>  
>  	snd_usb_unlock_shutdown(chip);
>  
>  	if (ret < 0) {
> -		if (strstr(kcontrol->id.name, "Speaker")) {
> -			ucontrol->value.integer.value[0] = 1;
> +		if (name && strstr(name, "Speaker")) {
> +			if (val)
> +				*val = 1;
>  			return 0;
>  		}
>  error:
> @@ -1491,6 +1492,21 @@ static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
>  		return filter_error(cval, ret);
>  	}
>  
> +	return ret;
> +}
> +
> +/* get the connectors status and report it as boolean type */
> +static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
> +				   struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct usb_mixer_elem_info *cval = kcontrol->private_data;
> +	int ret, val;
> +
> +	ret = get_connector_value(cval, kcontrol->id.name, &val);
> +
> +	if (ret < 0)
> +		return ret;
> +
>  	ucontrol->value.integer.value[0] = val;
>  	return 0;
>  }
> -- 
> 2.30.2
>