From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: [PATCH 07/13] ASoC: Add helper function to cast component back to CODEC Date: Tue, 18 Mar 2014 09:02:10 +0100 Message-ID: <1395129736-11938-8-git-send-email-lars@metafoo.de> References: <1395129736-11938-1-git-send-email-lars@metafoo.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp-out-224.synserver.de (smtp-out-230.synserver.de [212.40.185.230]) by alsa0.perex.cz (Postfix) with ESMTP id 68C19261B0E for ; Tue, 18 Mar 2014 09:01:47 +0100 (CET) In-Reply-To: <1395129736-11938-1-git-send-email-lars@metafoo.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Mark Brown , Liam Girdwood Cc: Brian Austin , Lars-Peter Clausen , patches@opensource.wolfsonmicro.com, alsa-devel@alsa-project.org, Paul Handrigan , Kuninori Morimoto , Peter Ujfalusi , Maxime Ripard , Charles Keepax List-Id: alsa-devel@alsa-project.org Add a helper function to cast back from a component struct to the CODEC struct it is embedded in. This is useful in situations where we know that a certain component is a CODEC and want to get access to some CODEC specific properties. Signed-off-by: Lars-Peter Clausen --- include/sound/soc.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/sound/soc.h b/include/sound/soc.h index f6d7ef4f..a355d0f 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -1093,6 +1093,19 @@ struct soc_enum { const unsigned int *values; }; +/** + * snd_soc_component_to_codec() - Casts a component to the CODEC it is embedded in + * @component: The component to cast to a CODEC + * + * This function must only be used on components that are known to be CODECs. + * Otherwise the behavior is undefined. + */ +static inline struct snd_soc_codec *snd_soc_component_to_codec( + struct snd_soc_component *component) +{ + return container_of(component, struct snd_soc_codec, component); +} + /* codec IO */ unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg); unsigned int snd_soc_write(struct snd_soc_codec *codec, -- 1.8.0