From patchwork Mon Nov 19 23:04:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajat Jain X-Patchwork-Id: 10689605 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 394F313AD for ; Mon, 19 Nov 2018 23:04:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2AAFA2A782 for ; Mon, 19 Nov 2018 23:04:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1E0F42A7BB; Mon, 19 Nov 2018 23:04:30 +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=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A55702A782 for ; Mon, 19 Nov 2018 23:04:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732073AbeKTJaZ (ORCPT ); Tue, 20 Nov 2018 04:30:25 -0500 Received: from mail-pg1-f201.google.com ([209.85.215.201]:50657 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732068AbeKTJaZ (ORCPT ); Tue, 20 Nov 2018 04:30:25 -0500 Received: by mail-pg1-f201.google.com with SMTP id u17so7269162pgn.17 for ; Mon, 19 Nov 2018 15:04:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=hozA7Ab9Mbo9dP4gWzek1tXXv9KaEdb0RAgi2ZqAK7A=; b=kNN3V41Qzl7VMMMjqPuUBqaprYPthA6N4Txzdkq/UT8nCXoc8FSn0r0uLsCroW+mm+ Up4i7WbNMfRfe2D6Kz2I8tbhi/4Crx41wITmLIbnjGzuT0PsKBEpcVDi4bMkKAclhfdg 2S7+C0PQGe6wR4BMipewGmJmR31hCPumKJTwOp77qmHcPUnaq+nSDQUvz5kxnhbkjtT9 K6UsWb87A0mfyc1cVUeciEolkJzx1y2pXeGphR/hfzabwoZCqiEJft0Gk4SUHGeTluVQ tOiiirdzJe3yLIdxKebkMuOO+3qXTUF+XJLp/t87ENKhmt2qFZJ4Ow9IoPiJA9F07nbX vfsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=hozA7Ab9Mbo9dP4gWzek1tXXv9KaEdb0RAgi2ZqAK7A=; b=pD0hFiZjUIDkMOReN1UCSPORRi0o8mtOuNNC6n4fOfCVvRm8Ko/WVID4KpLVCYGzIz UwSRkpRlCO1Uehw7BQND5ssU5y/5P0oTIBFwi4FkIAxgeFNwYQB8JobCtrjVlp6aofGZ or+O80zZossXFqXk0Ld1539hm8VAmJElJxhvKQcz3v8ERHoEUxC4LHYz0XG11uw0YSDy 6NMIIC12MxTswC3Ep0NVp3OUKnrcTMqxNEEUtGQzBilr+5cXXN2vFu9LXErRTyAylXbw kSXWlK5PRwIUOpiKwby5c8OYCmauzpR3vk1phChN/D25A9QYQLfGQbdalhqNhlDVyYFZ UWmQ== X-Gm-Message-State: AGRZ1gLNuajb53DgSmGSVLuxFbL/z9w5LF0jd0+b5wTdHvgrhUeEiRsq Y6bFk2SFco+U+FkwtuOFtCcJJqf2WltG X-Google-Smtp-Source: AJdET5ecBZzURnJmtWNOpDzYUP6gzTjRvxiu7VaSkfzZWHs94/8LDuHXzrAweriKyMCS4ZZr3ce5wPTctIw9 X-Received: by 2002:a63:2c13:: with SMTP id s19mr7793541pgs.75.1542668667066; Mon, 19 Nov 2018 15:04:27 -0800 (PST) Date: Mon, 19 Nov 2018 15:04:06 -0800 In-Reply-To: <20181119230409.258121-1-rajatja@google.com> Message-Id: <20181119230409.258121-2-rajatja@google.com> Mime-Version: 1.0 References: <20181117010748.24347-1-rajatja@google.com> <20181119230409.258121-1-rajatja@google.com> X-Mailer: git-send-email 2.19.1.1215.g8438c0b245-goog Subject: [PATCH v2 2/5] usb: assign ACPI companions for embedded USB devices From: Rajat Jain To: Marcel Holtmann , Johan Hedberg , Greg Kroah-Hartman , "David S. Miller" , Dmitry Torokhov , Rajat Jain , Alex Hung , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org Cc: rajatxjain@gmail.com, dtor@google.com, raghuram.hegde@intel.com, chethan.tumkur.narayan@intel.com, sukumar.ghorai@intel.com Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Dmitry Torokhov USB devices permanently connected to USB ports may be described in ACPI tables and share ACPI devices with ports they are connected to. See [1] for details. This will allow us to describe sideband resources for devices, such as, for example, hard reset line for BT USB controllers. [1] https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/other-acpi-namespace-objects#acpi-namespace-hierarchy-and-adr-for-embedded-usb-devices Signed-off-by: Dmitry Torokhov Signed-off-by: Rajat Jain (changed how we get the usb_port) --- v2: same as v1 drivers/usb/core/usb-acpi.c | 44 +++++++++++++++++++++++++++++-------- 1 file changed, 35 insertions(+), 9 deletions(-) diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c index 8ff73c83e8e8..9043d7242d67 100644 --- a/drivers/usb/core/usb-acpi.c +++ b/drivers/usb/core/usb-acpi.c @@ -200,30 +200,56 @@ static struct acpi_device * usb_acpi_find_companion_for_device(struct usb_device *udev) { struct acpi_device *adev; + struct usb_port *port_dev; + struct usb_hub *hub; + + if (!udev->parent) { + /* root hub is only child (_ADR=0) under its parent, the HC */ + adev = ACPI_COMPANION(udev->dev.parent); + return acpi_find_child_device(adev, 0, false); + } - if (!udev->parent) + hub = usb_hub_to_struct_hub(udev->parent); + if (!hub) return NULL; - /* root hub is only child (_ADR=0) under its parent, the HC */ - adev = ACPI_COMPANION(udev->dev.parent); - return acpi_find_child_device(adev, 0, false); + /* + * This is an embedded USB device connected to a port and such + * devices share port's ACPI companion. + */ + port_dev = hub->ports[udev->portnum - 1]; + return usb_acpi_get_companion_for_port(port_dev); } - static struct acpi_device *usb_acpi_find_companion(struct device *dev) { /* - * In the ACPI DSDT table, only usb root hub and usb ports are - * acpi device nodes. The hierarchy like following. + * The USB hierarchy like following: + * * Device (EHC1) * Device (HUBN) * Device (PR01) * Device (PR11) * Device (PR12) + * Device (FN12) + * Device (FN13) * Device (PR13) * ... - * So all binding process is divided into two parts. binding - * root hub and usb ports. + * where HUBN is root hub, and PRNN are USB ports and devices + * connected to them, and FNNN are individualk functions for + * connected composite USB devices. PRNN and FNNN may contain + * _CRS and other methods describing sideband resources for + * the connected device. + * + * On the kernel side both root hub and embedded USB devices are + * represented as instances of usb_device structure, and ports + * are represented as usb_port structures, so the whole process + * is split into 2 parts: finding companions for devices and + * finding companions for ports. + * + * Note that we do not handle individual functions of composite + * devices yet, for that we would need to assign companions to + * devices corresponding to USB interfaces. */ if (is_usb_device(dev)) return usb_acpi_find_companion_for_device(to_usb_device(dev));