From nobody Tue Apr 7 12:06:06 2026 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 5F8B3ECAAA2 for ; Mon, 29 Aug 2022 02:44:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229574AbiH2Cob (ORCPT ); Sun, 28 Aug 2022 22:44:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229462AbiH2Co2 (ORCPT ); Sun, 28 Aug 2022 22:44:28 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7BA083C8F0 for ; Sun, 28 Aug 2022 19:44:27 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id cv9-20020a056a0044c900b00537c5841b0bso2468216pfb.12 for ; Sun, 28 Aug 2022 19:44:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc; bh=qjyzIwXVkUkDf0UkZRUU6V68vw5g1IkZe/Jh8oGPdDI=; b=U/94KM9NXpZmSc+hMYxHzYRtgMrfoxaVSJnIDlIjpVuok4Zafd/uo0FByTZzwm8ECh cQeGCS7/yGLJTTEjsItsDQuL3o2E/KwhruL7/3LlOtt05TFeyj26v/ULKaaa4q/XuUVY 7Fhd2U5nFDMKGztQY9fys/FVlErdiHb8urBk4Ge5vbT8OfafJ4GhXK2nBS4E6nZl32TF giOmkMrtFvFrd+97rdjYqU5TVZEXNoDj7vhJ0tKB/ZOgSlWanSlI0qyVMBkMe0e/t7H6 PKhGCjz4CpgJetSeM0BJCZoKrjCUFJYPRAbudlwYiTXei5veMJOuyvWl+sh5T56sOieD nN8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc; bh=qjyzIwXVkUkDf0UkZRUU6V68vw5g1IkZe/Jh8oGPdDI=; b=SSyVe1o76o7DjU0RaCC0Qp7QEyyqu7v4FA8lA6n12FkaExl5GwINaZY2GxMFAIDrI4 arhhv87+kAmVa8wESNVgWTQ4/SG/lSxbAQahNVL8VJE3qRwvWyvFCGjwcEsr5j1py+TU 9TRsGY0Buejh2mFtkELg0TTuJVb3aGWfrtuEzA0NWYHg6d204uh4SZTUC3sn5zDhdlfS aLhuUobGE928uaQPEOBkePNFGjc05v9QqxT4sMbvMwaYq4JLRAvU0cu+cik9q/fKMd6t GOliSHDROIguo0CosnhCUpA2FxS68SNTyhRs2Zrpy0CusOauteLYjhxPwVnk1Hq983Lr xhDQ== X-Gm-Message-State: ACgBeo3qavXoe1qCKcSbO/DPMCmZl/SwePtfIqDXKbbu+wf/mc59YYHM GbFljDwy/VVyCCj5DewldG2ciOnv1vv8Pfjt7usC X-Google-Smtp-Source: AA6agR7r5/L5GlvHoc8ZBtvWtojvBBJBXTNkhaXq8PbOl5fMYh4tW7cqCJv7wXyaphWAu0fbcTKiq/EP9RYMga8xn02b X-Received: from jsl.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:3cdb]) (user=justinledford job=sendgmr) by 2002:a05:6a00:1a44:b0:528:6af7:ff4a with SMTP id h4-20020a056a001a4400b005286af7ff4amr14728709pfv.78.1661741066972; Sun, 28 Aug 2022 19:44:26 -0700 (PDT) Date: Mon, 29 Aug 2022 02:43:51 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220829024351.2415147-1-justinledford@google.com> Subject: [PATCH] hwmon: (max31790) add fanN_enable From: Justin Ledford To: Jean Delvare , Guenter Roeck , Jonathan Corbet Cc: linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Justin Ledford Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The MAX31790 has a tach input enable bit in each fan's configuration register. This is only enabled by the driver if RPM mode is selected, but the driver doesn't provide a way to independently enable tachometer input regardless of the regulator mode. By adding the fanN_enable sysfs files, we can decouple the tach input from the regulator mode. Also update the documentation. Signed-off-by: Justin Ledford --- Documentation/hwmon/max31790.rst | 1 + drivers/hwmon/max31790.c | 44 +++++++++++++++++++++++++++----- 2 files changed, 38 insertions(+), 7 deletions(-) diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max3179= 0.rst index 7b097c3b9b90..33c5c7330efc 100644 --- a/Documentation/hwmon/max31790.rst +++ b/Documentation/hwmon/max31790.rst @@ -38,6 +38,7 @@ Sysfs entries fan[1-12]_input RO fan tachometer speed in RPM fan[1-12]_fault RO fan experienced fault fan[1-6]_target RW desired fan speed in RPM +fan[1-6]_enable RW enable or disable the tachometer input pwm[1-6]_enable RW regulator mode, 0=3Ddisabled (duty cycle=3D0%), 1= =3Dmanual mode, 2=3Drpm mode pwm[1-6] RW read: current pwm duty cycle, write: target pwm duty cycle (0-255) diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c index 7e9362f6dc29..3ae02be4b41e 100644 --- a/drivers/hwmon/max31790.c +++ b/drivers/hwmon/max31790.c @@ -118,6 +118,12 @@ static struct max31790_data *max31790_update_device(st= ruct device *dev) goto abort; data->target_count[i] =3D rv; } + + rv =3D i2c_smbus_read_byte_data(client, + MAX31790_REG_FAN_CONFIG(i)); + if (rv < 0) + goto abort; + data->fan_config[i] =3D rv; } =20 data->last_updated =3D jiffies; @@ -202,6 +208,9 @@ static int max31790_read_fan(struct device *dev, u32 at= tr, int channel, } mutex_unlock(&data->update_lock); return 0; + case hwmon_fan_enable: + *val =3D !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN); + return 0; default: return -EOPNOTSUPP; } @@ -214,7 +223,7 @@ static int max31790_write_fan(struct device *dev, u32 a= ttr, int channel, struct i2c_client *client =3D data->client; int target_count; int err =3D 0; - u8 bits; + u8 bits, fan_config; int sr; =20 mutex_lock(&data->update_lock); @@ -243,6 +252,23 @@ static int max31790_write_fan(struct device *dev, u32 = attr, int channel, MAX31790_REG_TARGET_COUNT(channel), data->target_count[channel]); break; + case hwmon_fan_enable: + fan_config =3D data->fan_config[channel]; + if (val =3D=3D 0) { + fan_config &=3D ~MAX31790_FAN_CFG_TACH_INPUT_EN; + } else if (val =3D=3D 1) { + fan_config |=3D MAX31790_FAN_CFG_TACH_INPUT_EN; + } else { + err =3D -EINVAL; + break; + } + if (fan_config !=3D data->fan_config[channel]) { + err =3D i2c_smbus_write_byte_data(client, MAX31790_REG_FAN_CONFIG(chann= el), + fan_config); + if (!err) + data->fan_config[channel] =3D fan_config; + } + break; default: err =3D -EOPNOTSUPP; break; @@ -270,6 +296,10 @@ static umode_t max31790_fan_is_visible(const void *_da= ta, u32 attr, int channel) !(fan_config & MAX31790_FAN_CFG_TACH_INPUT)) return 0644; return 0; + case hwmon_fan_enable: + if (channel < NR_CHANNEL) + return 0644; + return 0; default: return 0; } @@ -423,12 +453,12 @@ static umode_t max31790_is_visible(const void *data, =20 static const struct hwmon_channel_info *max31790_info[] =3D { HWMON_CHANNEL_INFO(fan, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, HWMON_F_INPUT | HWMON_F_FAULT, HWMON_F_INPUT | HWMON_F_FAULT, HWMON_F_INPUT | HWMON_F_FAULT, --=20 2.37.2.672.g94769d06f0-goog