From patchwork Fri Nov 10 11:49:05 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Koul X-Patchwork-Id: 10052927 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DFEE560631 for ; Fri, 10 Nov 2017 11:46:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D9D822B0C1 for ; Fri, 10 Nov 2017 11:46:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CE86F2B110; Fri, 10 Nov 2017 11:46:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6B6A92B0C1 for ; Fri, 10 Nov 2017 11:46:49 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 2B39F267900; Fri, 10 Nov 2017 12:46:28 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 1650B267902; Fri, 10 Nov 2017 12:46:25 +0100 (CET) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by alsa0.perex.cz (Postfix) with ESMTP id 7498F2678F9 for ; Fri, 10 Nov 2017 12:46:19 +0100 (CET) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP; 10 Nov 2017 03:46:18 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.44,373,1505804400"; d="scan'208"; a="1242463668" Received: from vkoul-udesk7.iind.intel.com (HELO localhost.localdomain) ([10.223.84.143]) by fmsmga002.fm.intel.com with ESMTP; 10 Nov 2017 03:46:14 -0800 Received: from localhost.localdomain (localhost [127.0.0.1]) by localhost.localdomain (8.15.2/8.15.2/Debian-3) with ESMTP id vAABnViM013054; Fri, 10 Nov 2017 17:19:31 +0530 Received: (from vkoul@localhost) by localhost.localdomain (8.15.2/8.15.2/Submit) id vAABnUBd013053; Fri, 10 Nov 2017 17:19:30 +0530 From: Vinod Koul To: Greg Kroah-Hartman Date: Fri, 10 Nov 2017 17:19:05 +0530 Message-Id: <1510314556-13002-4-git-send-email-vinod.koul@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1510314556-13002-1-git-send-email-vinod.koul@intel.com> References: <1510314556-13002-1-git-send-email-vinod.koul@intel.com> Cc: ALSA , Charles Keepax , Sudheer Papothi , Takashi , plai@codeaurora.org, LKML , Pierre , patches.audio@intel.com, Mark , srinivas.kandagatla@linaro.org, Shreyas NC , Sanyog Kale , Sagar Dharia , alan@linux.intel.com Subject: [alsa-devel] [PATCH v2 03/14] soundwire: Add Master registration X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 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: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP A Master registers with SoundWire bus and scans the firmware provided for device description. In this patch we scan the ACPI namespaces and create the SoundWire Slave devices based on the ACPI description Signed-off-by: Sanyog Kale Signed-off-by: Vinod Koul --- drivers/soundwire/Makefile | 2 +- drivers/soundwire/bus.c | 163 +++++++++++++++++++++++++++++++++++++++ drivers/soundwire/bus.h | 20 +++++ drivers/soundwire/slave.c | 172 ++++++++++++++++++++++++++++++++++++++++++ include/linux/soundwire/sdw.h | 11 +++ 5 files changed, 367 insertions(+), 1 deletion(-) create mode 100644 drivers/soundwire/bus.c create mode 100644 drivers/soundwire/slave.c diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile index d1281def7662..c875e434f8b3 100644 --- a/drivers/soundwire/Makefile +++ b/drivers/soundwire/Makefile @@ -3,5 +3,5 @@ # #Bus Objs -soundwire-bus-objs := bus_type.o +soundwire-bus-objs := bus_type.o bus.o slave.o obj-$(CONFIG_SOUNDWIRE_BUS) += soundwire-bus.o diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c new file mode 100644 index 000000000000..5bb9d930f86a --- /dev/null +++ b/drivers/soundwire/bus.c @@ -0,0 +1,163 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2015-17 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * BSD LICENSE + * + * Copyright(c) 2015-17 Intel Corporation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include +#include +#include +#include +#include "bus.h" + +/** + * sdw_add_bus_master: add a bus Master instance + * + * @bus: bus instance + * + * Initializes the bus instance, read properties and create child + * devices. + */ +int sdw_add_bus_master(struct sdw_bus *bus) +{ + int ret; + + if (!bus->dev) { + pr_err("SoundWire bus has no device"); + return -ENODEV; + } + + mutex_init(&bus->bus_lock); + INIT_LIST_HEAD(&bus->slaves); + + /* + * Enumeration device number and broadcast device number are + * not used for assignment so mask these and other higher bits + */ + + /* Set higher order bits */ + *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM); + + /* Set device number and broadcast device number */ + set_bit(SDW_ENUM_DEV_NUM, bus->assigned); + set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned); + + /* + * SDW is an enumerable bus, but devices can be powered off. So, + * they won't be able to report as present. + * + * Create Slave devices based on Slaves described in + * the respective firmware (ACPI/DT) + */ + if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev)) + ret = sdw_acpi_find_slaves(bus); + else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node) + ret = sdw_of_find_slaves(bus); + else + ret = -ENOTSUPP; /* No ACPI/DT so error out */ + + if (ret) { + dev_err(bus->dev, "Finding slaves failed:%d\n", ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL(sdw_add_bus_master); + +static int sdw_delete_slave(struct device *dev, void *data) +{ + struct sdw_slave *slave = dev_to_sdw_dev(dev); + struct sdw_bus *bus = slave->bus; + + mutex_lock(&bus->bus_lock); + + if (slave->dev_num) /* clear dev_num if assigned */ + clear_bit(slave->dev_num, bus->assigned); + + list_del_init(&slave->node); + mutex_unlock(&bus->bus_lock); + + device_unregister(dev); + return 0; +} + +void sdw_delete_bus_master(struct sdw_bus *bus) +{ + device_for_each_child(bus->dev, NULL, sdw_delete_slave); +} +EXPORT_SYMBOL(sdw_delete_bus_master); + +void sdw_extract_slave_id(struct sdw_bus *bus, + u64 addr, struct sdw_slave_id *id) +{ + dev_dbg(bus->dev, "SDW Slave Addr: %llx", addr); + + /* + * Spec definition + * Register Bit Contents + * DevId_0 [7:4] 47:44 sdw_version + * DevId_0 [3:0] 43:40 unique_id + * DevId_1 39:32 mfg_id [15:8] + * DevId_2 31:24 mfg_id [7:0] + * DevId_3 23:16 part_id [15:8] + * DevId_4 15:08 part_id [7:0] + * DevId_5 07:00 class_id + */ + id->sdw_version = (addr >> 44) & GENMASK(3, 0); + id->unique_id = (addr >> 40) & GENMASK(3, 0); + id->mfg_id = (addr >> 24) & GENMASK(15, 0); + id->part_id = (addr >> 8) & GENMASK(15, 0); + id->class_id = addr & GENMASK(7, 0); + + dev_dbg(bus->dev, + "SDW Slave class_id %x, part_id %x, mfg_id %x, unique_id %x, version %x", + id->class_id, id->part_id, id->mfg_id, + id->unique_id, id->sdw_version); + +} diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index 9b3dca95a098..7b764661c89d 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -59,6 +59,26 @@ #include #include +#if IS_ENABLED(CONFIG_ACPI) +int sdw_acpi_find_slaves(struct sdw_bus *bus); +#else +static inline int sdw_acpi_find_slaves(struct sdw_bus *bus) +{ + return -ENOTSUPP; +} +#endif + +#if IS_ENABLED(CONFIG_OF) +int sdw_of_find_slaves(struct sdw_bus *bus); +#else +static inline int sdw_of_find_slaves(struct sdw_bus *bus) +{ + return -ENOTSUPP; +} +#endif + int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size); +void sdw_extract_slave_id(struct sdw_bus *bus, + unsigned long long addr, struct sdw_slave_id *id); #endif /* __SDW_BUS_H */ diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c new file mode 100644 index 000000000000..4bf2a6cf732c --- /dev/null +++ b/drivers/soundwire/slave.c @@ -0,0 +1,172 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2015-17 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * BSD LICENSE + * + * Copyright(c) 2015-17 Intel Corporation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include +#include +#include +#include "bus.h" + +static void sdw_slave_release(struct device *dev) +{ + struct sdw_slave *slave = dev_to_sdw_dev(dev); + + kfree(slave); +} + +static int sdw_slave_add(struct sdw_bus *bus, + struct sdw_slave_id *id, struct fwnode_handle *fwnode) +{ + struct sdw_slave *slave; + int ret; + + slave = kzalloc(sizeof(*slave), GFP_KERNEL); + if (!slave) + return -ENOMEM; + + /* Initialize data structure */ + memcpy(&slave->id, id, sizeof(*id)); + slave->dev.parent = bus->dev; + slave->dev.fwnode = fwnode; + + /* name shall be sdw:link:mfg:part:class:unique */ + dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x", + bus->link_id, id->mfg_id, id->part_id, + id->class_id, id->unique_id); + + slave->dev.release = sdw_slave_release; + slave->dev.bus = &sdw_bus_type; + slave->bus = bus; + slave->status = SDW_SLAVE_UNATTACHED; + slave->dev_num = 0; + + mutex_lock(&bus->bus_lock); + list_add_tail(&slave->node, &bus->slaves); + mutex_unlock(&bus->bus_lock); + + ret = device_register(&slave->dev); + if (ret) { + dev_err(bus->dev, "Failed to add slave: ret %d\n", ret); + + /* + * On err, don't free but drop ref as this will be freed + * when release method is invoked. + */ + mutex_lock(&bus->bus_lock); + list_del(&slave->node); + mutex_unlock(&bus->bus_lock); + put_device(&slave->dev); + return ret; + } + + return 0; +} + +#if IS_ENABLED(CONFIG_ACPI) +/* + * sdw_acpi_find_slaves: Find Slave devices in Master ACPI node + * + * @bus: SDW bus instance + * + * Scans Master ACPI node for SDW child Slave devices and registers it. + */ +int sdw_acpi_find_slaves(struct sdw_bus *bus) +{ + struct acpi_device *adev, *parent; + + parent = ACPI_COMPANION(bus->dev); + if (!parent) { + dev_err(bus->dev, "Can't find parent for acpi bind\n"); + return -ENODEV; + } + + list_for_each_entry(adev, &parent->children, node) { + unsigned long long addr; + struct sdw_slave_id id; + unsigned int link_id; + acpi_status status; + + status = acpi_evaluate_integer(adev->handle, + METHOD_NAME__ADR, NULL, &addr); + + if (ACPI_FAILURE(status)) { + dev_err(bus->dev, "_ADR resolution failed: %x\n", + status); + return status; + } + + /* Extract link id from ADR, it is from 48 to 51 bits */ + link_id = (addr >> 48) & GENMASK(3, 0); + + /* Check for link_id match */ + if (link_id != bus->link_id) + continue; + + sdw_extract_slave_id(bus, addr, &id); + + /* + * don't error check for sdw_slave_add as we want to continue + * adding Slaves + */ + sdw_slave_add(bus, &id, acpi_fwnode_handle(adev)); + } + + return 0; +} + +#endif + +#if IS_ENABLED(CONFIG_OF) +int sdw_of_find_slaves(struct sdw_bus *bus) +{ + /* placeholder now, fill on OF support */ + return -ENOTSUPP; +} +#endif diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 1be63d5538fe..9070aec77576 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -58,6 +58,14 @@ struct sdw_bus; struct sdw_slave; +/* SDW spec defines and enums, as defined by MIPI 1.1. Spec */ + +/* SDW Broadcast Device Number */ +#define SDW_BROADCAST_DEV_NUM 15 + +/* SDW Enumeration Device Number */ +#define SDW_ENUM_DEV_NUM 0 + #define SDW_MAX_DEVICES 11 /** @@ -170,4 +178,7 @@ struct sdw_bus { struct mutex bus_lock; }; +int sdw_add_bus_master(struct sdw_bus *bus); +void sdw_delete_bus_master(struct sdw_bus *bus); + #endif /* __SOUNDWIRE_H */