From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Sakamoto Subject: [PATCH 15/39] firewire-lib: Add a new function to check others' connection Date: Wed, 5 Mar 2014 19:48:03 +0900 Message-ID: <1394016507-15761-16-git-send-email-o-takashi@sakamocchi.jp> References: <5316963F.1000206@sakamocchi.jp> <1394016507-15761-1-git-send-email-o-takashi@sakamocchi.jp> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp311.phy.lolipop.jp (smtp311.phy.lolipop.jp [210.157.22.79]) by alsa0.perex.cz (Postfix) with ESMTP id 5BDBC26530F for ; Wed, 5 Mar 2014 11:49:03 +0100 (CET) In-Reply-To: <1394016507-15761-1-git-send-email-o-takashi@sakamocchi.jp> 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: clemens@ladisch.de, tiwai@suse.de, perex@perex.cz Cc: alsa-devel@alsa-project.org, ffado-devel@lists.sf.net List-Id: alsa-devel@alsa-project.org Plug Control Registers have two fields related to the number of established connections, one is 'Broadcast connection counter' and another is 'Point-to-point connection counter'. The driver can know there are established connections or not to check these fields. This is considering for JACK/FFADO streaming. Currently, when JACK/FFADO starts its streaming to the device, cmp_connection_establish() is failed expectedly. This seems to be enough but there are some devices which needs to change samplling frequency before trying to establish connections. For such devices, this functionality is needed. --- sound/firewire/cmp.c | 18 ++++++++++++++++++ sound/firewire/cmp.h | 1 + 2 files changed, 19 insertions(+) diff --git a/sound/firewire/cmp.c b/sound/firewire/cmp.c index 60d2e17..a8199fd 100644 --- a/sound/firewire/cmp.c +++ b/sound/firewire/cmp.c @@ -155,6 +155,24 @@ int cmp_connection_init(struct cmp_connection *c, EXPORT_SYMBOL(cmp_connection_init); /** + * cmp_connection_check_used - check connection is already esablished or not + * @c: the connection manager to be checked + */ +int cmp_connection_check_used(struct cmp_connection *c, bool *used) +{ + __be32 pcr; + int err; + + err = snd_fw_transaction( + c->resources.unit, TCODE_READ_QUADLET_REQUEST, + get_offset(c, false), &pcr, 4, 0); + if (err >= 0) + *used = (pcr & cpu_to_be32(PCR_BCAST_CONN | PCR_P2P_CONN_MASK)); + return err; +} +EXPORT_SYMBOL(cmp_connection_check_used); + +/** * cmp_connection_destroy - free connection manager resources * @c: the connection manager */ diff --git a/sound/firewire/cmp.h b/sound/firewire/cmp.h index 9b58448..ebcb484 100644 --- a/sound/firewire/cmp.h +++ b/sound/firewire/cmp.h @@ -38,6 +38,7 @@ int cmp_connection_init(struct cmp_connection *connection, struct fw_unit *unit, enum cmp_direction direction, unsigned int pcr_index); +int cmp_connection_check_used(struct cmp_connection *connection, bool *used); void cmp_connection_destroy(struct cmp_connection *connection); int cmp_connection_establish(struct cmp_connection *connection, -- 1.8.3.2