From patchwork Mon Jun 27 15:51:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Binding X-Patchwork-Id: 12896826 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 4EE64C433EF for ; Mon, 27 Jun 2022 15:53:19 +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 F2825167F; Mon, 27 Jun 2022 17:52:26 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz F2825167F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1656345197; bh=iU9lWOnWLlEFCKlsTgoF0b45Cb7fPjYRK257kD6nyec=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=Ho1T9TJ+wYUfXmwmk0VFbaVoe3e23pP1FvhO0nGhp+ulTUqmGcRp/+cGx0W6K88Wv soPu+dGAZYlK33f8x652Z4P94YgfHnDgJjMza8J/L3Nmu+zT0p20933weu+2dU9D3I lAlKuu/dQ51+CGkXf4NwOQ4JMQdhKkgSy77OBTmE= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 0ED0EF804FB; Mon, 27 Jun 2022 17:51:57 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 298C3F8012F; Mon, 27 Jun 2022 17:51:54 +0200 (CEST) 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 F3DBFF8012F for ; Mon, 27 Jun 2022 17:51:47 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz F3DBFF8012F Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=cirrus.com header.i=@cirrus.com header.b="K543wORA" Received: from pps.filterd (m0077473.ppops.net [127.0.0.1]) by mx0a-001ae601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25RCSNNM017521; Mon, 27 Jun 2022 10:51:44 -0500 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=cNlZorGv6JS7ckt03ISAuWh7D5us6y00SzunIsbrn6k=; b=K543wORAWqrSoMZDLFueXD+QpZq13i89k3H1uAFL/AarOwOX5XtqEOBRAvd01mSbGBas 1fEpjgP2pyhhSSNaNrjOdZSbzxNDmmivP4V29XT+ut3z8r3PLAiu/FMU1BH9Ejd+bC1b +ZP6gO0IvM7AWEAHAhnLxxnqORKn2cIbFIs+ORunGIBKEHeornjX8Rahsug2kRGAqwY4 3ouAzeecLPP2Nq0SofK4HJKBy9n7+0whBZpx6+zi0Ts3XEoVeQhgRYNav3B61OI/A1tX QYw3ubdATVCJsPQwUL4l7Z/pIxt0OaKuBgNQybML6ysZywqNvhZ5fwm/37DkWTnN7r43 vg== Received: from ediex01.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3gwys2k0uh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Mon, 27 Jun 2022 10:51:44 -0500 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 15.1.2375.28; Mon, 27 Jun 2022 16:51:42 +0100 Received: from ediswmail.ad.cirrus.com (198.61.86.93) by EDIEX01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server id 15.1.2375.28 via Frontend Transport; Mon, 27 Jun 2022 16:51:42 +0100 Received: from sbinding-cirrus-dsktp.ad.cirrus.com (unknown [198.90.238.163]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id 3C00A2A1; Mon, 27 Jun 2022 15:51:42 +0000 (UTC) From: Stefan Binding To: "Rafael J . Wysocki" , Len Brown , Mark Brown , Liam Girdwood Subject: [PATCH v3 1/2] ACPI: utils: Add api to read _SUB from ACPI Date: Mon, 27 Jun 2022 16:51:37 +0100 Message-ID: <20220627155138.807420-2-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220627155138.807420-1-sbinding@opensource.cirrus.com> References: <20220627155138.807420-1-sbinding@opensource.cirrus.com> MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: DuqIE9-RarZwtpyVxb_Ga0837oESTzqD X-Proofpoint-GUID: DuqIE9-RarZwtpyVxb_Ga0837oESTzqD X-Proofpoint-Spam-Reason: safe Cc: linux-acpi@vger.kernel.org, alsa-devel@alsa-project.org, Stefan Binding , linux-kernel@vger.kernel.org, patches@opensource.cirrus.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" Add a wrapper function to read the _SUB string from ACPI. Signed-off-by: Stefan Binding Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/acpi/utils.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 6 ++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index 3a9773a09e19..4ef9ee4ad0d8 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -291,6 +291,44 @@ int acpi_get_local_address(acpi_handle handle, u32 *addr) } EXPORT_SYMBOL(acpi_get_local_address); +#define ACPI_MAX_SUB_BUF_SIZE 9 + +const char *acpi_get_subsystem_id(acpi_handle handle) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + const char *sub; + + status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer); + if (ACPI_FAILURE(status)) { + acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status); + return ERR_PTR(-ENODATA); + } + + obj = buffer.pointer; + if (obj->type == ACPI_TYPE_STRING) { + if (strlen(obj->string.pointer) < ACPI_MAX_SUB_BUF_SIZE && + strlen(obj->string.pointer) > 0) { + sub = kstrdup(obj->string.pointer, GFP_KERNEL); + if (!sub) + sub = ERR_PTR(-ENOMEM); + } else { + acpi_handle_err(handle, "ACPI _SUB Length %d is Invalid\n", + strlen(obj->string.pointer)); + sub = ERR_PTR(-EINVAL); + } + } else { + acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n"); + sub = ERR_PTR(-EINVAL); + } + + acpi_os_free(buffer.pointer); + + return sub; +} +EXPORT_SYMBOL_GPL(acpi_get_subsystem_id); + acpi_status acpi_evaluate_reference(acpi_handle handle, acpi_string pathname, diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 4f82a5bc6d98..968a187f14f0 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -762,6 +762,7 @@ static inline u64 acpi_arch_get_root_pointer(void) #endif int acpi_get_local_address(acpi_handle handle, u32 *addr); +const char *acpi_get_subsystem_id(acpi_handle handle); #else /* !CONFIG_ACPI */ @@ -1023,6 +1024,11 @@ static inline int acpi_get_local_address(acpi_handle handle, u32 *addr) return -ENODEV; } +static inline const char *acpi_get_subsystem_id(acpi_handle handle) +{ + return ERR_PTR(-ENODEV); +} + static inline int acpi_register_wakeup_handler(int wake_irq, bool (*wakeup)(void *context), void *context) {