From patchwork Thu Jul 7 15:10:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Binding X-Patchwork-Id: 588155 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 B6766C43334 for ; Thu, 7 Jul 2022 15:11:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235994AbiGGPLJ (ORCPT ); Thu, 7 Jul 2022 11:11:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235932AbiGGPLE (ORCPT ); Thu, 7 Jul 2022 11:11:04 -0400 Received: from mx0b-001ae601.pphosted.com (mx0a-001ae601.pphosted.com [67.231.149.25]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A474E24F25; Thu, 7 Jul 2022 08:11:03 -0700 (PDT) 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 267BU6Jh020187; Thu, 7 Jul 2022 10:10:46 -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=kbe+Cs9YYhGN2CUMNc8/yCRLFrEnli9igyLJqvC0TCg=; b=Q0zLmSEUeLSqSW32Tagj909zKr/+dMCz5lTxPrlhLhoKtH1UyEkwK6xTT90rcMFRkA2O piG3/neQ/B4RLeL8Cookhey97u6yI6koT1Gdz1iQK7jKYTnKK/hkjabkPHmVQ0zm3lVK a9K0nBbcOm5H0iOADQYbbv8L2WmjTxLmVuTQ6wxXXTcQeN4q3TG9iK/tvbvhcuOIgl9n fcc5RXjRVEG+7CcQzy9UocoL3W9EwWBL9Uy0MhVAiqBWyBzmSKQual92V8IJnB1eUjU6 dFMzmORPFQeEWGxycyJdHsQvn3LM0P1nqYBeYIJtcHbPFfumkFyRlNTG9H9UTMqNhWyi 7Q== Received: from ediex01.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3h4ucmjr6f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 07 Jul 2022 10:10:46 -0500 Received: from ediex02.ad.cirrus.com (198.61.84.81) 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; Thu, 7 Jul 2022 16:10:44 +0100 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 15.2.1118.9; Thu, 7 Jul 2022 10:10:43 -0500 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; Thu, 7 Jul 2022 16:10:43 +0100 Received: from sbinding-cirrus-dsktp.ad.cirrus.com (NEWBNB750653-PC.ad.cirrus.com [198.90.238.195]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id 2076B2A9; Thu, 7 Jul 2022 15:10:43 +0000 (UTC) From: Stefan Binding To: "Rafael J . Wysocki" , Len Brown , Mark Brown , Liam Girdwood CC: , , , , "Stefan Binding" Subject: [PATCH v6 0/2] Read _SUB from ACPI to be able to identify firmware Date: Thu, 7 Jul 2022 16:10:35 +0100 Message-ID: <20220707151037.3901050-1-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Proofpoint-GUID: OZC9w9_PtZjU2C4sUcXR2oFOOsf6bZ3W X-Proofpoint-ORIG-GUID: OZC9w9_PtZjU2C4sUcXR2oFOOsf6bZ3W 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 v5: - Clean up return codes - Refactor length calculation - Allow fallback to existing behaviour when bad ACPI is detected Changes since v4: - Rename function Changes since v3: - Fix 32 bit format string warning Changes since v2: - Fix error in function prototype 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 | 30 ++++++++++++++++++++++++++++++ 3 files changed, 74 insertions(+)