From patchwork Mon Jun 27 14:11:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Binding X-Patchwork-Id: 585862 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E6C0C433EF for ; Mon, 27 Jun 2022 14:12:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235538AbiF0OMM (ORCPT ); Mon, 27 Jun 2022 10:12:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234846AbiF0OML (ORCPT ); Mon, 27 Jun 2022 10:12:11 -0400 Received: from mx0b-001ae601.pphosted.com (mx0b-001ae601.pphosted.com [67.231.152.168]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F57313E27; Mon, 27 Jun 2022 07:12:10 -0700 (PDT) Received: from pps.filterd (m0077474.ppops.net [127.0.0.1]) by mx0b-001ae601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25RCn06H027978; Mon, 27 Jun 2022 09:12:03 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cirrus.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=PODMain02222019; bh=kKHbTQVbRij3BjfskU5kHjjPsm8UzILiriN2/NeS3tw=; b=XRoISmmBHi7eUskptbmw4mr1Cn01vxEOvcqMYh08Tgjjj1b0+XUsbLqxBZ5LCzB15lKa UA+NxJaHZ9Hcws5JevDSe3S7bd+2DRaihHEzG1SgnbtqahszBpY+Your9j3JbBqNsBfk sgJfeJpA68cOlDY4n1D4+YUjUcHeiz/GCpNcr8vz3OhylWCLsf+8fG0pGny59363wWRR rzCvEb4NjvYVxPaEaA3m5jleQV/tTJRMGJ9+fU9N5PrEtGSRlXFvEsooEnenYpjgQeqI c9yt7vWmBroJkH1DQQnTmr0vRcUC6a1nRsnAXiCyH02wswhkO1vUmVeYvCDbdsfUy/Dl 7w== Received: from ediex02.ad.cirrus.com ([84.19.233.68]) by mx0b-001ae601.pphosted.com (PPS) with ESMTPS id 3gwxsq2qjm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Mon, 27 Jun 2022 09:12:03 -0500 Received: from EDIEX01.ad.cirrus.com (198.61.84.80) by EDIEX02.ad.cirrus.com (198.61.84.81) 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 15:12:02 +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 15:12:02 +0100 Received: from sbinding-cirrus-dsktp.ad.cirrus.com (unknown [198.90.238.163]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id 31B4F2A1; Mon, 27 Jun 2022 14:12:01 +0000 (UTC) From: Stefan Binding To: "Rafael J . Wysocki" , Len Brown , Mark Brown , Liam Girdwood CC: , , , , Stefan Binding Subject: [PATCH v2 0/2] Read _SUB from ACPI to be able to identify firmware Date: Mon, 27 Jun 2022 15:11:46 +0100 Message-ID: <20220627141148.804319-1-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Proofpoint-GUID: yEnf3Se5JcKdyp-XF1hPLQQKIteU4Zts X-Proofpoint-ORIG-GUID: yEnf3Se5JcKdyp-XF1hPLQQKIteU4Zts X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org CS35L41 has a DSP which is able to run firmware, as well as a tuning file. Different systems may want to use different firmwares and tuning files, and some firmwares/tunings may not be compatible with other systems. To allow a system to select the correct fimware/tuning, we can read an _SUB from the ACPI. This _SUB can then be used to uniquely identify the system in the firmware/tuning file name. Add a helper function which reads the _SUB, so this can be used by other parts in the future. Add support inside the CS35L41 ASoC driver to read this _SUB, and save it appropriately. Changes since v1: - Add length validation for SSID String - Rename API - Allocate memory inside API - Use ACPI_HANDLE macro instead of ACPI_COMPANION - Improve error handling Stefan Binding (2): ACPI: utils: Add api to read _SUB from ACPI ASoC: cs35l41: Read System Name from ACPI _SUB to identify firmware drivers/acpi/utils.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 6 ++++++ sound/soc/codecs/cs35l41.c | 24 ++++++++++++++++++++++++ 3 files changed, 68 insertions(+)