From patchwork Wed Apr 29 18:51:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liao, Bard" X-Patchwork-Id: 192844 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DATE_IN_PAST_06_12, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC313C83001 for ; Thu, 30 Apr 2020 06:48:32 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 68E63214D8 for ; Thu, 30 Apr 2020 06:48:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="YHTr/DVW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 68E63214D8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id CB00E168F; Thu, 30 Apr 2020 08:47:40 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz CB00E168F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1588229310; bh=Mv7cM1rn5Q4sADrKgwXvCgsSghKGeJtyJVay+I23NXs=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=YHTr/DVWHns/3b6eG9eOWkRSRYRu6hQ4AmdsCZIji/Q+aggsR7fg+OInBrBT8pkty 2oFPTNnLeL2ucZpWulvahzO+Ps/9KERFOnXrYxhkwcZZbyBQk10j7B2W5zB03ExHd7 sT7/HHj19j6nlmiAuq3ECnlw49VY+bGJRWh65aJY= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id AE421F8028D; Thu, 30 Apr 2020 08:46:53 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 24DBFF8029A; Thu, 30 Apr 2020 08:46:51 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 470FDF80266 for ; Thu, 30 Apr 2020 08:46:42 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 470FDF80266 IronPort-SDR: Tv9q84ROguZiNaAnwwCVgPT1FZHoLIlNE8vQe1FSO02wG0+7HQLW8kk6n5kSQHwJTqyVBabjFi XWqRh6UcXJVQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2020 23:46:41 -0700 IronPort-SDR: R6ISdZ2f9XRQ5xgWSTaEngdpVMRVh9/G2mNkjDkKd8nawJkSJtEX+kWnsuImzb8RvA6WitYCJl RPDYhyKb3ZVQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,334,1583222400"; d="scan'208";a="249662786" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by fmsmga008.fm.intel.com with ESMTP; 29 Apr 2020 23:46:38 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH 2/3] soundwire: bus_type: introduce sdw_slave_type and sdw_master_type Date: Thu, 30 Apr 2020 02:51:44 +0800 Message-Id: <20200429185145.12891-3-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200429185145.12891-1-yung-chuan.liao@linux.intel.com> References: <20200429185145.12891-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, mengdong.lin@intel.com, slawomir.blauciak@intel.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Pierre-Louis Bossart this is a preparatory patch before the introduction of the sdw_master_type. The SoundWire slave support is slightly modified with the use of a sdw_slave_type, and the uevent handling move to slave.c (since it's not necessary for the master). No functionality change other than moving code around. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao --- drivers/soundwire/bus_type.c | 19 +++++++++++++------ drivers/soundwire/slave.c | 8 +++++++- include/linux/soundwire/sdw_type.h | 9 ++++++++- 3 files changed, 28 insertions(+), 8 deletions(-) diff --git a/drivers/soundwire/bus_type.c b/drivers/soundwire/bus_type.c index 17f096dd6806..2c1a19caba51 100644 --- a/drivers/soundwire/bus_type.c +++ b/drivers/soundwire/bus_type.c @@ -33,13 +33,21 @@ sdw_get_device_id(struct sdw_slave *slave, struct sdw_driver *drv) static int sdw_bus_match(struct device *dev, struct device_driver *ddrv) { - struct sdw_slave *slave = dev_to_sdw_dev(dev); - struct sdw_driver *drv = drv_to_sdw_driver(ddrv); + struct sdw_slave *slave; + struct sdw_driver *drv; + int ret = 0; + + if (is_sdw_slave(dev)) { + slave = dev_to_sdw_dev(dev); + drv = drv_to_sdw_driver(ddrv); - return !!sdw_get_device_id(slave, drv); + ret = !!sdw_get_device_id(slave, drv); + } + return ret; } -int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size) +static int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, + size_t size) { /* modalias is sdw:mp */ @@ -47,7 +55,7 @@ int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size) slave->id.mfg_id, slave->id.part_id); } -static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env) +int sdw_slave_uevent(struct device *dev, struct kobj_uevent_env *env) { struct sdw_slave *slave = dev_to_sdw_dev(dev); char modalias[32]; @@ -63,7 +71,6 @@ static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env) struct bus_type sdw_bus_type = { .name = "soundwire", .match = sdw_bus_match, - .uevent = sdw_uevent, }; EXPORT_SYMBOL_GPL(sdw_bus_type); diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c index aace57fae7f8..ed068a004bd9 100644 --- a/drivers/soundwire/slave.c +++ b/drivers/soundwire/slave.c @@ -14,6 +14,12 @@ static void sdw_slave_release(struct device *dev) kfree(slave); } +struct device_type sdw_slave_type = { + .name = "sdw_slave", + .release = sdw_slave_release, + .uevent = sdw_slave_uevent, +}; + static int sdw_slave_add(struct sdw_bus *bus, struct sdw_slave_id *id, struct fwnode_handle *fwnode) { @@ -41,9 +47,9 @@ static int sdw_slave_add(struct sdw_bus *bus, id->class_id, id->unique_id); } - slave->dev.release = sdw_slave_release; slave->dev.bus = &sdw_bus_type; slave->dev.of_node = of_node_get(to_of_node(fwnode)); + slave->dev.type = &sdw_slave_type; slave->bus = bus; slave->status = SDW_SLAVE_UNATTACHED; init_completion(&slave->enumeration_complete); diff --git a/include/linux/soundwire/sdw_type.h b/include/linux/soundwire/sdw_type.h index aaa7f4267c14..52eb66cd11bc 100644 --- a/include/linux/soundwire/sdw_type.h +++ b/include/linux/soundwire/sdw_type.h @@ -5,6 +5,13 @@ #define __SOUNDWIRE_TYPES_H extern struct bus_type sdw_bus_type; +extern struct device_type sdw_slave_type; +extern struct device_type sdw_master_type; + +static inline int is_sdw_slave(const struct device *dev) +{ + return dev->type == &sdw_slave_type; +} #define drv_to_sdw_driver(_drv) container_of(_drv, struct sdw_driver, driver) @@ -14,7 +21,7 @@ extern struct bus_type sdw_bus_type; int __sdw_register_driver(struct sdw_driver *drv, struct module *owner); void sdw_unregister_driver(struct sdw_driver *drv); -int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size); +int sdw_slave_uevent(struct device *dev, struct kobj_uevent_env *env); /** * module_sdw_driver() - Helper macro for registering a Soundwire driver From patchwork Wed Apr 29 18:51:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liao, Bard" X-Patchwork-Id: 192843 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DATE_IN_PAST_06_12, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6F34C83006 for ; Thu, 30 Apr 2020 06:49:30 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 321E3214D8 for ; Thu, 30 Apr 2020 06:49:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="Bfg1tnw5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 321E3214D8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 95487167D; Thu, 30 Apr 2020 08:48:38 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 95487167D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1588229368; bh=Zrb3iGUulkD3L3a88P9F6EZpZAUS2j3LGLQ/W6XfbZk=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=Bfg1tnw5r36nbtnoLHEx1j7wXY/vtqYqeRvJhGz44VRRTBvoZJ9tHI7f44nk1vSmV +rbqBY/t5s9PTNYFz0LHz/RGnPr4FnSALIG1axrG9mCBbBv5DTEKnzTTQFZmSBFxZY OQYfsAGTCiWM02nHgWADEdwSLil5nhVdbVVaW9rc= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id B78D4F8021C; Thu, 30 Apr 2020 08:46:58 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 04014F80290; Thu, 30 Apr 2020 08:46:54 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 3528EF80292 for ; Thu, 30 Apr 2020 08:46:46 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 3528EF80292 IronPort-SDR: 0eFZin9D8Gf4/4Op/G3zkoDjFCPcjoUVAJ1ww2pCoseLFFQabTwu7vCnsBinq9t6Znj6mWHaTI 1jRepMn1Otcw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2020 23:46:45 -0700 IronPort-SDR: sWE2BURnu8GLHMTvnWamUpSzLF+VZi1DlhV/vvPMm0TWLYsDzgmnT+cBoQN30/PGxHZBXdE62Q RSHMjAoe9P/A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,334,1583222400"; d="scan'208";a="249662792" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by fmsmga008.fm.intel.com with ESMTP; 29 Apr 2020 23:46:41 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH 3/3] soundwire: bus_type: add sdw_master_device support Date: Thu, 30 Apr 2020 02:51:45 +0800 Message-Id: <20200429185145.12891-4-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200429185145.12891-1-yung-chuan.liao@linux.intel.com> References: <20200429185145.12891-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, mengdong.lin@intel.com, slawomir.blauciak@intel.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Pierre-Louis Bossart In the existing SoundWire code, Master Devices are not explicitly represented - only SoundWire Slave Devices are exposed (the use of capital letters follows the SoundWire specification conventions). The SoundWire Master Device provides the clock, synchronization information and command/control channels. When multiple links are supported, a Controller may expose more than one Master Device; they are typically embedded inside a larger audio cluster (be it in an SOC/chipset or an external audio codec), and we need to describe it using the Linux device and driver model. This transition will avoid abusing platform devices and allow for better sysfs support without the reference count issues mentioned in the initial reviews. The sdw_master_device addition is done with minimal internal plumbing and not exposed externally. The existing API based on sdw_bus_master_add() and sdw_bus_master_delete() will deal with the sdw_master_device life cycle, which minimizes changes to existing drivers. Note that the Intel code will be modified in follow-up patches (no impact on any platform since the connection with ASoC is not supported upstream so far). Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao --- drivers/soundwire/Makefile | 2 +- drivers/soundwire/bus.c | 12 ++++-- drivers/soundwire/bus.h | 3 ++ drivers/soundwire/master.c | 79 +++++++++++++++++++++++++++++++++++ drivers/soundwire/qcom.c | 1 - include/linux/soundwire/sdw.h | 17 +++++++- 6 files changed, 108 insertions(+), 6 deletions(-) create mode 100644 drivers/soundwire/master.c diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile index e2cdff990e9f..7319918e0aec 100644 --- a/drivers/soundwire/Makefile +++ b/drivers/soundwire/Makefile @@ -4,7 +4,7 @@ # #Bus Objs -soundwire-bus-objs := bus_type.o bus.o slave.o mipi_disco.o stream.o +soundwire-bus-objs := bus_type.o bus.o master.o slave.o mipi_disco.o stream.o obj-$(CONFIG_SOUNDWIRE) += soundwire-bus.o ifdef CONFIG_DEBUG_FS diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 18024ff770f8..7eb1e6efd567 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -24,9 +24,14 @@ int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, struct sdw_master_prop *prop = NULL; int ret; - if (!bus->dev) { - pr_err("SoundWire bus has no device\n"); - return -ENODEV; + if (!bus) + return -EINVAL; + + ret = sdw_master_device_add(bus, parent, fwnode); + if (ret) { + dev_err(parent, "Failed to add master device at link %d\n", + bus->link_id); + return ret; } if (!bus->ops) { @@ -142,6 +147,7 @@ static int sdw_delete_slave(struct device *dev, void *data) void sdw_bus_master_delete(struct sdw_bus *bus) { device_for_each_child(bus->dev, NULL, sdw_delete_slave); + sdw_master_device_del(bus); sdw_bus_debugfs_exit(bus); } diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index 204204a26db8..93ab0234a491 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -19,6 +19,9 @@ static inline int sdw_acpi_find_slaves(struct sdw_bus *bus) int sdw_of_find_slaves(struct sdw_bus *bus); void sdw_extract_slave_id(struct sdw_bus *bus, u64 addr, struct sdw_slave_id *id); +int sdw_master_device_add(struct sdw_bus *bus, struct device *parent, + struct fwnode_handle *fwnode); +int sdw_master_device_del(struct sdw_bus *bus); #ifdef CONFIG_DEBUG_FS void sdw_bus_debugfs_init(struct sdw_bus *bus); diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c new file mode 100644 index 000000000000..2eeb2d7f56e0 --- /dev/null +++ b/drivers/soundwire/master.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright(c) 2019-2020 Intel Corporation. + +#include +#include +#include +#include +#include "bus.h" + +/* nothing to free but this function is mandatory */ +static void sdw_master_device_release(struct device *dev) +{ +} + +struct device_type sdw_master_type = { + .name = "soundwire_master", + .release = sdw_master_device_release, +}; + +/** + * sdw_master_device_add() - create a Linux Master Device representation. + * @bus: SDW bus instance + * @parent: parent device + * @fwnode: firmware node handle + */ +int sdw_master_device_add(struct sdw_bus *bus, struct device *parent, + struct fwnode_handle *fwnode) +{ + struct sdw_master_device *md; + int ret; + + if (!bus) + return -EINVAL; + + /* + * Unlike traditional devices, there's no allocation here since the + * sdw_master_device is embedded in the bus structure. + */ + md = &bus->md; + md->dev.bus = &sdw_bus_type; + md->dev.type = &sdw_master_type; + md->dev.parent = parent; + md->dev.of_node = parent->of_node; + md->dev.fwnode = fwnode; + md->dev.dma_mask = parent->dma_mask; + + dev_set_name(&md->dev, "sdw-master-%d", bus->link_id); + + ret = device_register(&md->dev); + if (ret) { + dev_err(parent, "Failed to add master: ret %d\n", ret); + /* + * On err, don't free but drop ref as this will be freed + * when release method is invoked. + */ + put_device(&md->dev); + goto device_register_err; + } + + /* add shortcuts to improve code readability/compactness */ + md->bus = bus; + bus->dev = &md->dev; + +device_register_err: + return ret; +} + +/** + * sdw_master_device_del() - delete a Linux Master Device representation. + * @bus: bus handle + * + * This function is the dual of sdw_master_device_add() + */ +int sdw_master_device_del(struct sdw_bus *bus) +{ + device_unregister(bus->dev); + + return 0; +} diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 401811d6627e..1c335ab1cd3f 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -784,7 +784,6 @@ static int qcom_swrm_probe(struct platform_device *pdev) mutex_init(&ctrl->port_lock); INIT_WORK(&ctrl->slave_work, qcom_swrm_slave_wq); - ctrl->bus.dev = dev; ctrl->bus.ops = &qcom_swrm_ops; ctrl->bus.port_ops = &qcom_swrm_port_ops; ctrl->bus.compute_params = &qcom_swrm_compute_params; diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 2003e8c55538..071adf2b463f 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -632,6 +632,19 @@ struct sdw_slave { #define dev_to_sdw_dev(_dev) container_of(_dev, struct sdw_slave, dev) +/** + * struct sdw_master_device - SoundWire 'Master Device' representation + * @dev: Linux device for this Master + * @bus: Bus handle shortcut to improve readability (same as container_of) + */ +struct sdw_master_device { + struct device dev; + struct sdw_bus *bus; +}; + +#define dev_to_sdw_master_device(d) \ + container_of(d, struct sdw_master_device, dev) + struct sdw_driver { const char *name; @@ -787,7 +800,8 @@ struct sdw_master_ops { /** * struct sdw_bus - SoundWire bus - * @dev: Master linux device + * @dev: shortcut to &md->dev to improve readability + * @md: Master device * @link_id: Link id number, can be 0 to N, unique for each Master * @slaves: list of Slaves on this bus * @assigned: Bitmap for Slave device numbers. @@ -812,6 +826,7 @@ struct sdw_master_ops { */ struct sdw_bus { struct device *dev; + struct sdw_master_device md; unsigned int link_id; struct list_head slaves; DECLARE_BITMAP(assigned, SDW_MAX_DEVICES);