From patchwork Thu Oct 17 12:40:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamel BOUHARA X-Patchwork-Id: 11195631 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F2A90139A for ; Thu, 17 Oct 2019 12:41:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB806214E0 for ; Thu, 17 Oct 2019 12:41:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728223AbfJQMlR (ORCPT ); Thu, 17 Oct 2019 08:41:17 -0400 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:52671 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726214AbfJQMlR (ORCPT ); Thu, 17 Oct 2019 08:41:17 -0400 X-Originating-IP: 86.207.98.53 Received: from localhost (aclermont-ferrand-651-1-259-53.w86-207.abo.wanadoo.fr [86.207.98.53]) (Authenticated sender: kamel.bouhara@bootlin.com) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 04BEA6000D; Thu, 17 Oct 2019 12:41:14 +0000 (UTC) From: Kamel Bouhara To: Sebastian Reichel , Nicolas Ferre , Alexandre Belloni , Ludovic Desroches , linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Thomas Petazzoni , Kamel Bouhara Subject: [PATCH] power: reset: at91-reset: add sysfs interface to the power on reason Date: Thu, 17 Oct 2019 14:40:58 +0200 Message-Id: <20191017124058.19300-1-kamel.bouhara@bootlin.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patch export the power on reason through the sysfs interface and introduce some generic reset sources. Update the ABI documentation to list current power on sources. Signed-off-by: Kamel Bouhara Acked-by: Nicolas Ferre --- .../sysfs-devices-platform-power-on-reason | 14 ++++++ drivers/power/reset/at91-reset.c | 44 +++++++++++++------ include/linux/power/power_on_reason.h | 19 ++++++++ 3 files changed, 64 insertions(+), 13 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-devices-platform-power-on-reason create mode 100644 include/linux/power/power_on_reason.h -- 2.23.0 diff --git a/Documentation/ABI/testing/sysfs-devices-platform-power-on-reason b/Documentation/ABI/testing/sysfs-devices-platform-power-on-reason new file mode 100644 index 000000000000..83daeb9b1aa2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-platform-power-on-reason @@ -0,0 +1,14 @@ +What: /sys/devices/platform/.../power_on_reason + +Date: October 2019 +KernelVersion: 5.4 +Contact: Kamel Bouhara +Description: This file shows system power on reason. + The possible sources are: + General System Power-ON, RTC wakeup, Watchdog timeout, + Software Reset, User pressed reset button, + CPU Clock failure, 32.768kHz Oscillator Failure, + Low power mode exit, Unknown. + + The file is read only. + diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c index 44ca983a49a1..3cb2df40af37 100644 --- a/drivers/power/reset/at91-reset.c +++ b/drivers/power/reset/at91-reset.c @@ -17,7 +17,7 @@ #include #include #include - +#include #include #include @@ -146,42 +146,42 @@ static int samx7_restart(struct notifier_block *this, unsigned long mode, return NOTIFY_DONE; } -static void __init at91_reset_status(struct platform_device *pdev) +static const char *at91_reset_reason(struct platform_device *pdev) { const char *reason; u32 reg = readl(at91_rstc_base + AT91_RSTC_SR); switch ((reg & AT91_RSTC_RSTTYP) >> 8) { case RESET_TYPE_GENERAL: - reason = "general reset"; + reason = POWER_ON_REASON_GENERAL; break; case RESET_TYPE_WAKEUP: - reason = "wakeup"; + reason = POWER_ON_REASON_RTC; break; case RESET_TYPE_WATCHDOG: - reason = "watchdog reset"; + reason = POWER_ON_REASON_WATCHDOG; break; case RESET_TYPE_SOFTWARE: - reason = "software reset"; + reason = POWER_ON_REASON_SOFTWARE; break; case RESET_TYPE_USER: - reason = "user reset"; + reason = POWER_ON_REASON_USER; break; case RESET_TYPE_CPU_FAIL: - reason = "CPU clock failure detection"; + reason = POWER_ON_REASON_CPU_FAIL; break; case RESET_TYPE_XTAL_FAIL: - reason = "32.768 kHz crystal failure detection"; + reason = POWER_ON_REASON_XTAL_FAIL; break; case RESET_TYPE_ULP2: - reason = "ULP2 reset"; + reason = POWER_ON_REASON_LOW_POWER; break; default: - reason = "unknown reset"; + reason = POWER_ON_REASON_UNKNOWN; break; } - dev_info(&pdev->dev, "Starting after %s\n", reason); + return reason; } static const struct of_device_id at91_ramc_of_match[] = { @@ -204,6 +204,17 @@ static struct notifier_block at91_restart_nb = { .priority = 192, }; +static ssize_t power_on_reason_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + + return sprintf(buf, "%s\n", at91_reset_reason(pdev)); +} + +static DEVICE_ATTR_RO(power_on_reason); + static int __init at91_reset_probe(struct platform_device *pdev) { const struct of_device_id *match; @@ -248,7 +259,14 @@ static int __init at91_reset_probe(struct platform_device *pdev) return ret; } - at91_reset_status(pdev); + ret = device_create_file(&pdev->dev, &dev_attr_power_on_reason); + if (ret) { + dev_err(&pdev->dev, "Could not create sysfs entry\n"); + return ret; + } + + dev_info(&pdev->dev, "Starting after %s reset\n", + at91_reset_reason(pdev)); return 0; } diff --git a/include/linux/power/power_on_reason.h b/include/linux/power/power_on_reason.h new file mode 100644 index 000000000000..9978cc757427 --- /dev/null +++ b/include/linux/power/power_on_reason.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Author: Kamel Bouhra + */ + +#ifndef POWER_ON_REASON_H +#define POWER_ON_REASON_H + +#define POWER_ON_REASON_GENERAL "General" +#define POWER_ON_REASON_RTC "RTC wakeup" +#define POWER_ON_REASON_WATCHDOG "Watchdog timeout" +#define POWER_ON_REASON_SOFTWARE "Software" +#define POWER_ON_REASON_USER "User" +#define POWER_ON_REASON_CPU_FAIL "CPU Clock Failure" +#define POWER_ON_REASON_XTAL_FAIL "32.768k Crystal oscillator Failure" +#define POWER_ON_REASON_LOW_POWER "Low power exit" +#define POWER_ON_REASON_UNKNOWN "Unknown" + +#endif /* POWER_ON_REASON_H */