From patchwork Fri Apr 9 16:25:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Patrick Leis X-Patchwork-Id: 12194537 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham 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 D3F6EC433B4 for ; Fri, 9 Apr 2021 16:45:33 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 4DD08610A7 for ; Fri, 9 Apr 2021 16:45:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4DD08610A7 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44430 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lUuGC-0006eb-GJ for qemu-devel@archiver.kernel.org; Fri, 09 Apr 2021 12:45:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52640) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <3HYBwYAcKCugfOXdebOQYYQVO.MYWaOWe-NOfOVXYXQXe.YbQ@flex--venture.bounces.google.com>) id 1lUtxW-0005Yv-2E for qemu-devel@nongnu.org; Fri, 09 Apr 2021 12:26:14 -0400 Received: from mail-qt1-x84a.google.com ([2607:f8b0:4864:20::84a]:53738) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <3HYBwYAcKCugfOXdebOQYYQVO.MYWaOWe-NOfOVXYXQXe.YbQ@flex--venture.bounces.google.com>) id 1lUtxS-0007VE-Op for qemu-devel@nongnu.org; Fri, 09 Apr 2021 12:26:13 -0400 Received: by mail-qt1-x84a.google.com with SMTP id u13so3385642qtv.20 for ; Fri, 09 Apr 2021 09:26:05 -0700 (PDT) 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=/nZIqirGm/4hMePzQ47kJsD6GC6cfP2kwpUtkwbOQ3w=; b=T36F7rw/kBF+6HKCsr8xf+rfqzT1nrevkwj4jQWTvQFmZGLMSOvYOY2IQKv40/sGiD Bf5m8EPKhksUICsYl/HPC9BJF/SSds0E8Tj6NK2qLPqxA9QJMHXCiP0oKqXOsEMoAHmc EQbrarbhoI6ZJAguM5Sb12j/kIZrJe350TJL8Q86LkCmlyKkBb1sox9SQrHmmsIyQAvL ui8wVolRwf8RbNGCjmd4/bcT6wn04curF4doTFl4yLAAP8jenxKdd+/5VU7yxM9rGiVN KpaSo9ko7jNC1rujd6BaqZeoXDx7iROLYmlmCqc0NKtxIWFo6epfrbCdfXkORWmRuZoC YGCQ== 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=/nZIqirGm/4hMePzQ47kJsD6GC6cfP2kwpUtkwbOQ3w=; b=G7PXdpC5OROGBJfNWaN2k6i5kNow9ahHt9+4fbOmWy0+vGSCKE6ex8syhmRquAsBrY 9S/yZzziiKq2yExhVe5knROojAd4eqfVSunm1cqTDKgG978OyDylHjeX3FoNvs80xdP1 LE1tZxhti6t342n3Bm5f3EUCEEoKN1MKYUozpeEHQXf1gVvn1Y8y2uBnbp9Awt+4tF/A /X9HrWR5DJZMATMtW/ZCRLJti3nRz/IV9VTN0xW+EK0w1ojykBS0PMsgMswaEAQvgjmm 7OV9xYJt4njIYllzqgq691/d1L29y+9yYYmvrwCBQqP5iJ+raBW/4ITx7hDZXIUDji8V Sqmw== X-Gm-Message-State: AOAM532PEzztf9TszOh2INVWdGDiWPlA5gxyStnVSqjraTPNfE1LjvDA oT84QNeB4ydvbLIXYnRytaioMfofYQLA X-Google-Smtp-Source: ABdhPJzjH+3Z/j7Q7SY2mT9hVxZ+mFfs4LAsUTnoAdypM3WB0ogeUI1hcz/GKLCK1xN5zFdso5uVNvES++0N X-Received: from venture.svl.corp.google.com ([2620:15c:2a3:200:6985:9b01:e10b:b119]) (user=venture job=sendgmr) by 2002:a0c:9e17:: with SMTP id p23mr1897329qve.7.1617985565516; Fri, 09 Apr 2021 09:26:05 -0700 (PDT) Date: Fri, 9 Apr 2021 09:25:44 -0700 In-Reply-To: <20210409162545.3705962-1-venture@google.com> Message-Id: <20210409162545.3705962-4-venture@google.com> Mime-Version: 1.0 References: <20210409162545.3705962-1-venture@google.com> X-Mailer: git-send-email 2.31.1.295.g9ea45b61b8-goog Subject: [PATCH v2 3/4] hw/i2c: move search to i2c_scan_bus method From: Patrick Venture To: cminyard@mvista.com, wuhaotsh@google.com, hskinnemoen@google.com Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org, Patrick Venture Received-SPF: pass client-ip=2607:f8b0:4864:20::84a; envelope-from=3HYBwYAcKCugfOXdebOQYYQVO.MYWaOWe-NOfOVXYXQXe.YbQ@flex--venture.bounces.google.com; helo=mail-qt1-x84a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Moves the search for matching devices on an i2c bus into a separate method. This allows for an object that owns an I2CBus can avoid duplicating this method. Tested: A BMC firmware was booted to userspace and i2c devices were detected. Signed-off-by: Patrick Venture Reviewed-by: Hao Wu --- hw/i2c/core.c | 38 ++++++++++++++++++++++++++------------ include/hw/i2c/i2c.h | 1 + 2 files changed, 27 insertions(+), 12 deletions(-) diff --git a/hw/i2c/core.c b/hw/i2c/core.c index d03b0eea5c..12981cea2d 100644 --- a/hw/i2c/core.c +++ b/hw/i2c/core.c @@ -77,6 +77,30 @@ int i2c_bus_busy(I2CBus *bus) return !QLIST_EMPTY(&bus->current_devs); } +bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast) +{ + BusChild *kid; + + QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) { + DeviceState *qdev = kid->child; + I2CSlave *candidate = I2C_SLAVE(qdev); + I2CSlaveClass *sc = I2C_SLAVE_GET_CLASS(candidate); + + if (sc->match_and_add(candidate, address, broadcast, + &bus->current_devs)) { + if (!broadcast) { + return true; + } + } + } + + /* + * If broadcast was true, and the list was full or empty, return true. If + * broadcast was false, return false. + */ + return broadcast; +} + /* TODO: Make this handle multiple masters. */ /* * Start or continue an i2c transaction. When this is called for the @@ -93,7 +117,6 @@ int i2c_bus_busy(I2CBus *bus) */ int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv) { - BusChild *kid; I2CSlaveClass *sc; I2CNode *node; bool bus_scanned = false; @@ -115,17 +138,8 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv) * terminating the previous transaction. */ if (QLIST_EMPTY(&bus->current_devs)) { - QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) { - DeviceState *qdev = kid->child; - I2CSlave *candidate = I2C_SLAVE(qdev); - sc = I2C_SLAVE_GET_CLASS(candidate); - if (sc->match_and_add(candidate, address, bus->broadcast, - &bus->current_devs)) { - if (!bus->broadcast) { - break; - } - } - } + /* Disregard whether devices were found. */ + (void)i2c_scan_bus(bus, address, bus->broadcast); bus_scanned = true; } diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h index 9b8b95ff4a..45915f3303 100644 --- a/include/hw/i2c/i2c.h +++ b/include/hw/i2c/i2c.h @@ -87,6 +87,7 @@ void i2c_nack(I2CBus *bus); int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send); int i2c_send(I2CBus *bus, uint8_t data); uint8_t i2c_recv(I2CBus *bus); +bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast); /** * Create an I2C slave device on the heap.