From nobody Sun Feb 8 16:31:49 2026 Received: from EUR03-AM7-obe.outbound.protection.outlook.com (mail-am7eur03on2089.outbound.protection.outlook.com [40.107.105.89]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB1082080D0; Fri, 10 Jan 2025 06:14:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.105.89 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736489701; cv=fail; b=lV1FgzYsQkaxdUXlnyA74rUbBA/OzN2mfLg4fMjMVhA3PTbh7kBhz762Di9h0HzthkQcrum6rn/kCEKprgBsI93GC0Qfy46GpJ9mgfGhUQVdqZMGZ9Ywe8gOhAdhiCDJVH33ETWofGYAWgajd5aEFofQb3eGPZgw1JoWgctn+oY= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736489701; c=relaxed/simple; bh=U9s20N05vEYWEDnwpWYvGo0rRIUg+r1CE7QG5PycW/0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=dHD2rd7mGZZOaWCi6OS3AWl2nQdBB1VLOPFeqS0cO3lVYLr7umqgl2T+ubDNHut0l0XYx0V31MUBq4H3V7aTlBtaCEzmVour55G9+1Ty+HWAsXnAeIOtr3xB1w7yRZZrDX5nVVyGnAKjuhof/9Q/p23SDMgn+te/j4CZ0mcAVSg= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mt.com; spf=pass smtp.mailfrom=mt.com; dkim=pass (2048-bit key) header.d=mt.com header.i=@mt.com header.b=nxGbnTjz; arc=fail smtp.client-ip=40.107.105.89 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mt.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mt.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mt.com header.i=@mt.com header.b="nxGbnTjz" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Y1E1Yhp4zzs4aYj0xUu6eo1W4TzOq1X2iwHByyCp/Lemyap67FFI6qtgWj0V2Xv4WDFEoDf7XhWntOd/mB6Sd3joqtGdlCt+/eoVFBSsOCKiIar2f0V7cL3JXcwPRwoX7PTkAKljf2wZZQo1BGsr84jahKDme8XEJibwsVLhDx0zcO4T2rNH+mzg2YHC29kVh1HSPu5mfW8hE9fId3vSnX3yjnPGKEBTXC1XFwaZt5NY4ZdznFosSiYIqZGc+wNbTxy+qfiWKlD1kuRuLPHDrJ9SspUb/e4CPlZyzvSlKGObcYrurd47zbuHdXIB2Cn7mVzqDztSIRLD4kTXZlkeBQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=SoXrPOKQm1PlxTWqwNzYDDyvHktKoNWgTSCzqj7kUEw=; b=ZYeNbsTDJxuCgI7VNqKalNiRPACbf5GovrrZzKPJMMwGcRmslEZMld2hYD4mbrYcA1DUQgszbZPoq3Va2DTv92kLN6+T5dtIUI/S+obI43WqJDmw3nnUyXPBdAQHsp3dAEr/pK531RfWYSoOU8bDKAaReK9qLlj6R39v+qnwwNhhrnM95b1ighuw91AXoBdxwE1UR7OCipnxsdXFXwJIE6e2h9KVDEsGZZRnXoNtDqLPUuvXUIA4EW5LVc0lEIdy41UffSAFXcNcHMf2flYohyHytoqtvbBJOoW20uW3JchhFBoRxMsHC+pWqKIZt7eHgNxDT1R8V2Rm2+vlEsLWxQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=mt.com; dmarc=pass action=none header.from=mt.com; dkim=pass header.d=mt.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mt.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=SoXrPOKQm1PlxTWqwNzYDDyvHktKoNWgTSCzqj7kUEw=; b=nxGbnTjzPXHzZfDuvR8/VCP+Q/BI3PGmpk+2zM/sESSjs1+BVos1brAmLvHqUq8LC7ilRrWrX7i5YmDm0uFqkrsloQsES4RfaBjE54SSPoJ3W4/+bYUB+Cb43GsZOcj7UwEHXWYmnukZY6VUH3uvuccOUnIwQU+cfx/eC5OiQWji3iF2tfgplX+Dt6DMSDMlFkk2ANhddf775qIPzUkkpIwuup0N+JHkPrv6r0TEp5uefGOSDoMNFl5G7dJXzAPwRaRVYZXdchK3g7Jj+X8M22ygJILT99Fxb6jKcduzVbSIhnwrkO7eD7Zvv8yLGMo1PUoGJfuQgrArl6Qq8y9Ehg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=mt.com; Received: from DBBPR03MB5399.eurprd03.prod.outlook.com (2603:10a6:10:f5::22) by AS8PR03MB6776.eurprd03.prod.outlook.com (2603:10a6:20b:29c::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8335.13; Fri, 10 Jan 2025 06:14:56 +0000 Received: from DBBPR03MB5399.eurprd03.prod.outlook.com ([fe80::2fec:64f5:1893:f53a]) by DBBPR03MB5399.eurprd03.prod.outlook.com ([fe80::2fec:64f5:1893:f53a%3]) with mapi id 15.20.8335.011; Fri, 10 Jan 2025 06:14:56 +0000 From: Markus Burri To: linux-kernel@vger.kernel.org Cc: Markus Burri , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marek Vasut , linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, Manuel Traut Subject: [PATCH v1 4/7] rtc-rv8803: add tamper function to sysfs for rv8901 Date: Fri, 10 Jan 2025 07:13:58 +0100 Message-Id: <20250110061401.358371-5-markus.burri@mt.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250110061401.358371-1-markus.burri@mt.com> References: <20250110061401.358371-1-markus.burri@mt.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: ZR2P278CA0050.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:53::10) To DBBPR03MB5399.eurprd03.prod.outlook.com (2603:10a6:10:f5::22) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DBBPR03MB5399:EE_|AS8PR03MB6776:EE_ X-MS-Office365-Filtering-Correlation-Id: 97d7e3a3-86e2-4d1c-2871-08dd313e1ad2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|52116014|1800799024|366016|38350700014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?o/cdZ/aRrvRHQWT13cVnTTnD6MEEvKyqgbqi6QJGP7+5ctYDXsYylY543FtG?= =?us-ascii?Q?O13/G5kaTOJorOoeM24Phn8j8uFoAGnyR66TpDnpMtMp2sLdP9b/0kL3Le2T?= =?us-ascii?Q?OTX/YcwzwFheJLYzwo/tLCY7yBFYHDkcVQdR4n6w4NkIz5L70QuOsXldb21I?= =?us-ascii?Q?vbymIUtW/+vQIO0Kv4wWmHYYVvWUH3tuUfHpeMpqnHRxm5+wEjYFY8xondzJ?= =?us-ascii?Q?tkQ5CQcntIW5BQHRy6Qq1bJpc/ilEU+JEPlpCcNnkykwMDd+hSAZtQprglVF?= =?us-ascii?Q?poL1e//ItS5xXr0G8Bm6zd5ReNsD074CxsfJV8CkDy6f4I7l4JloWE0FnLzu?= =?us-ascii?Q?wqHdZEJpkud1IIG7vxejk7FDEyiNWfq4ShqAPBB3eKWyO5eYM0VhC8MzhDMA?= =?us-ascii?Q?J+uRlth7qfiWiApfyIDFS70ke5HR0E+K7D52lShy/mWcwcnxmmxd7N/qCTpz?= =?us-ascii?Q?L/hriuFQKfxFVsnv7VXg1CyXAjMlW2WQxpHnb6ahK496ZKMp//dFNJbeSl1U?= =?us-ascii?Q?iCEOjF5euZ6LOxIzgC3Ax1SfeF5aSCnpAPJMkVM99j/bLHa00ugTu21teJkX?= =?us-ascii?Q?rWJLuB1zlbyAuakNkME9uobQ/aBD9E5xuAtI6Lt4M3r9y8K5XIcOqerzWv1/?= =?us-ascii?Q?rX4gfxSOzxKO1xZYBwhlLyc2Vsxp9F122QvogErAYsM07SGiFZG4GMiyUhDg?= =?us-ascii?Q?9s6MJkRGpm6Kgg39J0S1ZX54maRWVBGts6SEW/PLfAri/FrgTtMCTYGKXGOO?= =?us-ascii?Q?qd7z5WvXUcHe8K4Fw8gNREfCCb49qA8TqzyrbhOeFUnLGQxG95YDgTqVm3wJ?= =?us-ascii?Q?c95d+3WL7wgtL1SHnG37RHOT76MAskyDSTU5l5EjXpdxiAKt78QKiMmR9efs?= =?us-ascii?Q?tFeOqs4OxssiCTk4SCl0ANeby5JfE1WkQ1bDUKRwEu5Hay/YwutBZaffZ2zz?= =?us-ascii?Q?IbDN3WzMKyRcAcTgJUxYmP7Sg3+lMx4kmPUmbRhKSajyPQaFvDOXw/7gqxt4?= =?us-ascii?Q?5ag1tISwkIPzo/Bnz2cKsfDAwdZDnrltl50goUBuPpXx1yDqcnbje+wjy5Fu?= =?us-ascii?Q?mckACQGIVAoxzUtJSdJoXdjXGVLFREgTXyMOi559C05vI9xahGr3AxZgxMPP?= =?us-ascii?Q?gcAtmrPoNjoYOqfj6mVVXAaET49L1uirphNXWBR+XIsL1eJ7W8scSvU6rOsH?= =?us-ascii?Q?ndY/JXnFs98K8iclhkeUt16x1DONpgO/ID5/nmIYWqUZWJG20sZQMfQrMH0Z?= =?us-ascii?Q?yETkoDfyJbyiO39MQkF55kDnvC+5iwdgWKCLi8OH+R9RK2io+BNP9dV8KOh5?= =?us-ascii?Q?cTfNQTriNt2tQOFapSXYdZwzEV54UdR7DupzBkcl3Qo0ZrCRyhPggeQkm72h?= =?us-ascii?Q?tJJJ4PMPJ3GwLMOQe88zmVXIs1FS8BkYr8KGBsYn1aXc9uMh4UbJxNmHAKAN?= =?us-ascii?Q?1JXnTz+kRKeJ2sW1wk7oxJhdVDPpqJgM?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DBBPR03MB5399.eurprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(52116014)(1800799024)(366016)(38350700014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?cm3LXDVfKK3BB17wV3uzTtVraIWeQnpTVRscoDWiL6tG+8YFMBnf++E7DvnX?= =?us-ascii?Q?IGzGbd12XFH9e4I6fzdG3u4eUwouUamQ7GcsGPu5tgoY1EO9gKqySBSLAasP?= =?us-ascii?Q?xemW8B3CiN+CnZJ6BXM3tEGjzsRT+4qBWGKqmmM14qxg/Y/nXVgo4pEB0Yro?= =?us-ascii?Q?P4zco542gxi7vldHoBoWbRHlynzlegqWJMsmzB4odQeTdbrZrRWbYJvBL8Kb?= =?us-ascii?Q?i7LNqPzR1qWSWkFi9AI32zTH5UHoGuMilMKez5LWJCU2l3kpknTjy3Bt8J/L?= =?us-ascii?Q?6KKgaGYI+6IZwTiAE3y3M4PnG85CmJZ57cKCTa2baRARkaZwjOEyi/cZNCjI?= =?us-ascii?Q?AdRqwYF5lLF8K/z41zJhTme7Myx9jdqNO+M4qP4WY9pFUwhtpPN5XzT2mQNM?= =?us-ascii?Q?phqARX555B7FlIQeRmdRVX4V+iLg1B/m6GIdQb8EnAMpxhGuRvyZxoyrZ3to?= =?us-ascii?Q?BggmNgxxS34+gyEt5wSu1DTmiHo04ekTF5u+Q0flZQFCY3M+6kQZ5iGK8a/8?= =?us-ascii?Q?wnyIb7FIYMUaFBpUgOpDYfDYkDbKo5hurS3XX6Haq+HXsb7Uwi5TBi2alath?= =?us-ascii?Q?BxZkENzvW29UpMP3OovBWvG02UN9to626WVLFxydPH4io1NehLhw6HszufjL?= =?us-ascii?Q?GCaOBrwcnHSCiS8BfWCKzT2YFuzIqOwMbeY145bqe+9InxhTLw1BaFIri1wU?= =?us-ascii?Q?cG7kt1Ev8r2r7uPsCwcU+bhoaoFySeUB8VR7ATVA47P/Jqu3rudYIP4Kr0K1?= =?us-ascii?Q?5ixqHLFUWrR5TX0x7uOZfDsdLZQg4sBMilGqWjus7PqjZfGUOx8k23spCN/t?= =?us-ascii?Q?ONrPfWCsU0FvRjoQGbGFS5BeLKvO2c4E5grLkifJcq3BGf0LZXo9r907yrjW?= =?us-ascii?Q?O9kkkiwXAEhP1TVUJumJSKM0IGbKCtLJ+nYCm5onegfoTI59ze5nTjLvhRUL?= =?us-ascii?Q?+5+ROXnzmbgOJxTaE37G4k0arD4NXXhQYsus0FbhcDraztn4crkMKXNdKCHv?= =?us-ascii?Q?9TgC6cYIcK4NWh/L/eGHZ+4vBkRbPzNsDiIE8EJush6fIrDmxoGbN9r7cPrO?= =?us-ascii?Q?C3XuO8I08AcIoi4hxUnI6QGBg3fYdFL7Et8mz6+c6vTHtjhHN2a+v5IQu8N8?= =?us-ascii?Q?Yej6yXMr3pb/mr9CNjQeAq4qG7cNmHODOD1pkgVAkFGMVvHXMwDFexrVLdHf?= =?us-ascii?Q?Tba5KhE8sA1HIkDN0PwM4q33vhEVYlF+w/W2So9Z+MzfjN/tG2iwmKW/aRjg?= =?us-ascii?Q?F/qYl596Xzq8/x0Ap9t1Z4CikxJlLaBYdCC08ehw5dUhlrorSm39IwLLCQ9h?= =?us-ascii?Q?YSRK+Afl866j3/7mzgq47ONMFK4welKIPcT3/gOmj9K5lpQ9pLWh6yT3HBmG?= =?us-ascii?Q?L2W0+hthziMa2O4+9KPg1nvkj7fBvRZ8VPh5///ADLfs9dnth7QQNb4HX9sj?= =?us-ascii?Q?xum1HqaWzxGSULkTlaGLrThYkEQowFVY8RNGFMMtqSZgZqfAQquB6L5G4A+z?= =?us-ascii?Q?PQKZl4bTtpR1OCxI6zxzeM4+1t/LJCf1aVI3aiS4YTjkesFhrUkF5fn6SzR3?= =?us-ascii?Q?abKKCkfHvvBTeDm/MzbYWtsigxu36o/k1ECBzUIR?= X-OriginatorOrg: mt.com X-MS-Exchange-CrossTenant-Network-Message-Id: 97d7e3a3-86e2-4d1c-2871-08dd313e1ad2 X-MS-Exchange-CrossTenant-AuthSource: DBBPR03MB5399.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2025 06:14:56.5054 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: fb4c0aee-6cd2-482f-a1a5-717e7c02496b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: KSR0Om5pl9YPvh8rm5eMrvnALWfPh37fMvuiHqJIiqIgjYBN4zy+9z1ZemKbH1IJ4FzQYjLeAZRu6SIf/tzTIw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR03MB6776 Content-Type: text/plain; charset="utf-8" Add sysfs interface to enable the EVINx pins and read the time-stamp events from EVINX. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 277 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index a4f2f53..754657d 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -680,6 +681,276 @@ static int rv8803_nvram_read(void *priv, unsigned int= offset, return 0; } =20 +static int rv8803_ts_event_write_evin(int evin, struct rv8803_data *rv8803= , int pullup_down, + int trigger, int filter) +{ + int ret; + u8 reg_mask; + struct i2c_client *client =3D rv8803->client; + + /* according to data-sheet, "1" is not valid for filter */ + if (evin >=3D NO_OF_EVIN || filter =3D=3D 1 || filter > EVIN_FILTER_MAX) + return -EINVAL; + + /* set EVENTx pull-up edge trigger */ + ret =3D rv8803_read_reg(client, evin_cfg_reg[evin]); + if (ret < 0) + return ret; + reg_mask =3D ret; + if (pullup_down !=3D -1) { + reg_mask &=3D ~RX8901_EVENTx_CFG_PUPD; + reg_mask |=3D FIELD_PREP(RX8901_EVENTx_CFG_PUPD, pullup_down); + } + if (trigger !=3D -1) { + reg_mask &=3D ~RX8901_EVENTx_CFG_POL; + reg_mask |=3D FIELD_PREP(RX8901_EVENTx_CFG_POL, trigger); + } + ret =3D rv8803_write_reg(client, evin_cfg_reg[evin], reg_mask); + if (ret < 0) + return ret; + + /* set EVENTx noise filter */ + if (filter !=3D -1) { + ret =3D rv8803_write_reg(client, evin_flt_reg[evin], filter); + if (ret < 0) + return ret; + } + + return 0; +} + +static ssize_t enable_store(struct device *dev, struct device_attribute *a= ttr, const char *buf, + size_t count) +{ + int ret; + int i; + unsigned long tmo; + u8 reg; + u8 reg_mask; + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + struct i2c_client *client =3D rv8803->client; + + /* EVINxCPEN | EVINxEN */; + const u8 reg_mask_evin_en =3D GENMASK(5, 3) | GENMASK(2, 0); + + bool enable =3D (strstr(buf, "1") =3D=3D buf) ? true : false; + + guard(mutex)(&rv8803->flags_lock); + + /* check if event detection status match requested mode */ + ret =3D rv8803_read_reg(client, RX8901_EVIN_EN); + if (ret < 0) + return ret; + + /* requested mode match current state -> nothing to do */ + if (ret =3D=3D (enable ? reg_mask_evin_en : 0)) + return count; + + dev_info(&client->dev, "%s time-stamp event detection\n", + (enable) ? "configure" : "disable"); + + /* 1. disable event detection interrupt */ + ret =3D rv8803_read_reg(rv8803->client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(rv8803->client, RV8803_CTRL, ret & ~RV8803_CTRL_= EIE); + if (ret) + return ret; + + /* 2. disable events for configuration */ + ret =3D rv8803_write_reg(client, RX8901_EVIN_EN, 0); + if (ret < 0) + return ret; + + /* for disable no configuration is needed */ + if (!enable) + return count; + + /* 3. set EVENTx pull-up edge trigger and noise filter */ + for (i =3D 0; i < NO_OF_EVIN; ++i) { + ret =3D rv8803_ts_event_write_evin(i, rv8803, pull_up_1M, falling_edge, = 0); + if (ret < 0) + return ret; + } + + /* 4. enable EVENTx interrupt and VBATL,VDDL */ + ret =3D rv8803_read_reg(client, RX8901_EVNT_INTE); + if (ret < 0) + return ret; + reg_mask =3D BIT(5) | BIT(6) | BIT(7); /* EVINxIEN 1-3 */ + reg_mask |=3D BIT(3) | BIT(1); /* VBATLIEN | VDDLIEN */ + reg =3D (ret & ~reg_mask) | reg_mask; + ret =3D rv8803_write_reg(client, RX8901_EVNT_INTE, reg); + if (ret < 0) + return ret; + + /* + * 5. set BUF1 inhibit and interrupt every 1 event + * NOTE: BUF2-3 are not used in FIFO-mode + */ + ret =3D rv8803_write_reg(client, RX8901_BUF1_CFG1, 0x01); + if (ret < 0) + return ret; + + /* 6. clean and init for BUFx and event counter 1-3 and trigger cmd */ + reg =3D BIT(7) | GENMASK(6, 4); + reg |=3D BIT(0); /* CMDTRGEN */ + ret =3D rv8803_write_reg(client, RX8901_WRCMD_CFG, reg); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RX8901_WRCMD_TRG, 0xFF); + if (ret < 0) + return ret; + tmo =3D jiffies + msecs_to_jiffies(100); /* timeout 100ms */ + do { + usleep_range(10, 2000); + ret =3D rv8803_read_reg(client, RX8901_WRCMD_TRG); + if (ret < 0) + return ret; + if (time_after(jiffies, tmo)) + return -EBUSY; + } while (ret); + + /* 7. enable event detection interrupt */ + ret =3D rv8803_read_reg(rv8803->client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(rv8803->client, RV8803_CTRL, ret | RV8803_CTRL_E= IE); + if (ret) + return ret; + + /* 8. / 10. enable events for configuration in FIFO mode */ + ret =3D rv8803_write_reg(client, RX8901_EVIN_EN, reg_mask_evin_en); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t read_show(struct device *dev, struct device_attribute *attr= , char *buf) +{ + int ret; + int ev_idx; + int num_events; + unsigned long long time_s; + int time_ms; + int offset =3D 0; + u8 reg_mask; + u8 data[10]; + struct rtc_time tm; + + struct i2c_client *client =3D to_i2c_client(dev->parent); + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + guard(mutex)(&rv8803->flags_lock); + + /* + * For detailed description see datasheet: + * - Reading Time Stamp Data (FIFO mode) + */ + + /* check interrupt source is from event 1-3 */ + ret =3D rv8803_read_reg(client, RX8901_EVNT_INTF); + if (ret < 0) + return ret; + + /* CHECK for EVF bit */ + if (ret & BIT(2)) { + /* clear EVINxF 1-3 */ + reg_mask =3D BIT(5) | BIT(6) | BIT(7); + ret =3D rv8803_write_reg(client, RX8901_EVNT_INTF, ret & ~reg_mask); + if (ret < 0) + return ret; + } + + /* check interrupt source is from event 1-3 */ + ret =3D rv8803_read_reg(client, RX8901_BUF_INTF); + if (ret < 0) + return ret; + if (ret & RX8901_BUF_INTF_BUF1F) { + /* disable interrupts */ + ret =3D rv8803_read_reg(client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RV8803_CTRL, ret & ~RV8803_CTRL_EIE); + if (ret < 0) + return ret; + + /* clear interrupt flag */ + ret =3D rv8803_read_reg(client, RX8901_BUF_INTF); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RX8901_BUF_INTF, ret & ~RX8901_BUF_INTF= _BUF1F); + if (ret < 0) + return ret; + } + + /* test if there are events available */ + ret =3D rv8803_read_reg(client, RX8901_BUF1_STAT); + if (ret < 0) + return ret; + num_events =3D ret & RX8901_BUFx_STAT_PTR; + + if (num_events) { + ret =3D rv8803_read_regs(client, 0x60, ARRAY_SIZE(data), data); + if (ret < 0) + return ret; + + tm.tm_sec =3D bcd2bin(data[2]); + tm.tm_min =3D bcd2bin(data[3]); + tm.tm_hour =3D bcd2bin(data[4]); + tm.tm_mday =3D bcd2bin(data[5]); + tm.tm_mon =3D bcd2bin(data[6]) - 1; + tm.tm_year =3D bcd2bin(data[7]) + 100; + tm.tm_wday =3D -1; + tm.tm_yday =3D -1; + tm.tm_isdst =3D -1; + + ret =3D rtc_valid_tm(&tm); + if (ret) + return ret; + + /* calculate 1/1024 -> ms */ + time_ms =3D (1000 * ((data[1] << 2) | (data[0] >> 6))) / 1024; + time_s =3D rtc_tm_to_time64(&tm); + + offset +=3D snprintf(buf + offset, PAGE_SIZE - offset, "%llu.%03d", time= _s, time_ms); + for (ev_idx =3D 0; trg_status_txt[ev_idx].txt; ++ev_idx) + if (data[9] & trg_status_txt[ev_idx].val) + offset +=3D snprintf(buf + offset, PAGE_SIZE - offset, " %s=3D%d", + trg_status_txt[ev_idx].txt, + !!(trg_status_txt[ev_idx].val & data[8])); + offset +=3D snprintf(buf + offset, PAGE_SIZE - offset, "\n"); + + /* according to the datasheet we have to wait for 1ms */ + usleep_range(1000, 2000); + } + + /* re-enable interrupts */ + ret =3D rv8803_read_reg(client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RV8803_CTRL, ret | RV8803_CTRL_EIE); + if (ret < 0) + return ret; + + return offset; +} + +static DEVICE_ATTR_WO(enable); +static DEVICE_ATTR_RO(read); + +static struct attribute *rv8803_rtc_event_attrs[] =3D { + &dev_attr_enable.attr, + &dev_attr_read.attr, + NULL +}; + +static const struct attribute_group rv8803_rtc_sysfs_event_files =3D { + .name =3D "tamper", + .attrs =3D rv8803_rtc_event_attrs, +}; + static const struct rtc_class_ops rv8803_rtc_ops =3D { .read_time =3D rv8803_get_time, .set_time =3D rv8803_set_time, @@ -854,6 +1125,12 @@ static int rv8803_probe(struct i2c_client *client) if (err) return err; =20 + if (rv8803->type =3D=3D rx_8901) { + err =3D rtc_add_group(rv8803->rtc, &rv8803_rtc_sysfs_event_files); + if (err) + return err; + } + rv8803->rtc->ops =3D &rv8803_rtc_ops; rv8803->rtc->range_min =3D RTC_TIMESTAMP_BEGIN_2000; rv8803->rtc->range_max =3D RTC_TIMESTAMP_END_2099; --=20 2.39.5