From patchwork Tue Jan 18 14:52:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Binding X-Patchwork-Id: 12716535 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id A98CFC433F5 for ; Tue, 18 Jan 2022 14:55:18 +0000 (UTC) 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 BC154184E; Tue, 18 Jan 2022 15:54:26 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz BC154184E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1642517716; bh=q5vjI8aPGLCOTcBAFpnMkKx7cJXdE+9pe0Z2g9hlgsg=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=pYfC+zL052Q/xt4kD/cPAtFzEgdFdkDPy+RioJS7lAq+rGUBz8xxIaXsKFjBYnCwk Viz8sihMP3SkudiQyrYoC7vq2RveE0qZ+0YjZzi86ngx4ARqb0CBAAPVav7IHUIKEA qKASX465wR09uXNgdhrXoJEqO9kevOqUY6Eih1y8= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id DA9FFF80100; Tue, 18 Jan 2022 15:53:46 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 5B29CF80517; Tue, 18 Jan 2022 15:53:45 +0100 (CET) Received: from mx0b-001ae601.pphosted.com (mx0a-001ae601.pphosted.com [67.231.149.25]) (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 03A22F80100 for ; Tue, 18 Jan 2022 15:53:38 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 03A22F80100 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=cirrus.com header.i=@cirrus.com header.b="IzP1oJPW" Received: from pps.filterd (m0077473.ppops.net [127.0.0.1]) by mx0a-001ae601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 20I1MV5q021792; Tue, 18 Jan 2022 08:53:36 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cirrus.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=PODMain02222019; bh=bpNY1rgvcIc2XyOVlH7EyAFUPxkKV43qVorDVN33PHg=; b=IzP1oJPW01aHahnCFagtaAyvkQVMMZHfO1KZMqQktlgY5i2kxVp1qSH3yveAa0qF3rH9 MKT3yTqHNEBpitTKVAtNbP7bQheKn+ILPsU2t6EjTIK62mgRG5AQ6Bv7qRMxfcl9nC70 ML+fSn3fwIXAYMoYVcQdn0Jq/q+2AS1RlOMkFMsjy+bXwfhcL+A5phtx3jC2vfZMW5eh 0h/zzxDNXcXlrSJNh1x0xYSCPF14zayNPQY7Nu7o09MPRUcjnkcmcswkRZrmplv4+PAr iMJpnI/zO8lOCNP/Mi5D2/OdMWOEB5WSfb2y5eU36T9XP7TOp68yP+IabE9RLMBb+KM/ gw== Received: from ediex01.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3dnaxhs9na-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Tue, 18 Jan 2022 08:53:35 -0600 Received: from EDIEX01.ad.cirrus.com (198.61.84.80) by EDIEX01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Tue, 18 Jan 2022 14:53:33 +0000 Received: from ediswmail.ad.cirrus.com (198.61.86.93) by EDIEX01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server id 15.1.2375.18 via Frontend Transport; Tue, 18 Jan 2022 14:53:33 +0000 Received: from LONN2DGDQ73.ad.cirrus.com (unknown [198.90.238.138]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id D8394B13; Tue, 18 Jan 2022 14:53:31 +0000 (UTC) From: Stefan Binding To: Mark Brown , "Rafael J . Wysocki" , Len Brown , Hans de Goede , Mark Gross , Jaroslav Kysela , Takashi Iwai Subject: [PATCH v3 02/10] spi: Create helper API to lookup ACPI info for spi device Date: Tue, 18 Jan 2022 14:52:43 +0000 Message-ID: <20220118145251.1548-3-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220118145251.1548-1-sbinding@opensource.cirrus.com> References: <20220118145251.1548-1-sbinding@opensource.cirrus.com> MIME-Version: 1.0 X-Proofpoint-GUID: SDa8XjxyX_GS-t3AubMg9_R-OjMcQgAE X-Proofpoint-ORIG-GUID: SDa8XjxyX_GS-t3AubMg9_R-OjMcQgAE X-Proofpoint-Spam-Reason: safe Cc: alsa-devel@alsa-project.org, patches@opensource.cirrus.com, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-acpi@vger.kernel.org, Stefan Binding , linux-spi@vger.kernel.org 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" This can then be used to find a spi resource inside an ACPI node, and allocate a spi device. Signed-off-by: Stefan Binding --- drivers/spi/spi.c | 46 ++++++++++++++++++++++++++++++++--------- include/linux/spi/spi.h | 12 +++++++++++ 2 files changed, 48 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 1eb84101c4ad..13f4701f0694 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2410,8 +2410,18 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) return 1; } -static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, - struct acpi_device *adev) +/** + * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information + * @ctlr: controller to which the spi device belongs + * @adev: ACPI Device for the spi device + * + * This should be used to allocate a new spi device from and ACPI Node. + * The caller is responsible for calling spi_add_device to register the spi device. + * + * Return: a pointer to the new device, or ERR_PTR on error. + */ +struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, + struct acpi_device *adev) { acpi_handle parent_handle = NULL; struct list_head resource_list; @@ -2419,10 +2429,6 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, struct spi_device *spi; int ret; - if (acpi_bus_get_status(adev) || !adev->status.present || - acpi_device_enumerated(adev)) - return AE_OK; - lookup.ctlr = ctlr; lookup.irq = -1; @@ -2433,7 +2439,7 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, if (ret < 0) /* found SPI in _CRS but it points to another controller */ - return AE_OK; + return ERR_PTR(-ENODEV); if (!lookup.max_speed_hz && ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) && @@ -2443,16 +2449,15 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, } if (!lookup.max_speed_hz) - return AE_OK; + return ERR_PTR(-ENODEV); spi = spi_alloc_device(ctlr); if (!spi) { dev_err(&ctlr->dev, "failed to allocate SPI device for %s\n", dev_name(&adev->dev)); - return AE_NO_MEMORY; + return ERR_PTR(-ENOMEM); } - ACPI_COMPANION_SET(&spi->dev, adev); spi->max_speed_hz = lookup.max_speed_hz; spi->mode |= lookup.mode; @@ -2460,6 +2465,27 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, spi->bits_per_word = lookup.bits_per_word; spi->chip_select = lookup.chip_select; + return spi; +} +EXPORT_SYMBOL_GPL(acpi_spi_device_alloc); + +static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, + struct acpi_device *adev) +{ + struct spi_device *spi; + + if (acpi_bus_get_status(adev) || !adev->status.present || + acpi_device_enumerated(adev)) + return AE_OK; + + spi = acpi_spi_device_alloc(ctlr, adev); + if (IS_ERR(spi)) { + if (PTR_ERR(spi) == -ENOMEM) + return AE_NO_MEMORY; + else + return AE_OK; + } + acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias, sizeof(spi->modalias)); diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 0346a3ff27fd..200725692b93 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -16,6 +16,7 @@ #include #include +#include struct dma_chan; struct software_node; @@ -759,6 +760,17 @@ extern int devm_spi_register_controller(struct device *dev, struct spi_controller *ctlr); extern void spi_unregister_controller(struct spi_controller *ctlr); +#if IS_ENABLED(CONFIG_ACPI) +extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, + struct acpi_device *adev); +#else +static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, + struct acpi_device *adev); +{ + return ERR_PTR(-EOPNOTSUPP); +} +#endif + /* * SPI resource management while processing a SPI message */