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[72.90.70.109]) by smtp.gmail.com with ESMTPSA id m7-20020a05620a220700b006ff8a122a1asm1723091qkh.78.2023.01.26.14.32.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:32:28 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:32:23 -0500 Subject: [PATCH v4 1/5] dt-bindings: hwmon: adi,ltc2945: Add binding MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230126-b4-ltc2945_shunt_resistor-v4-1-bb913470d8da@criticallink.com> References: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> In-Reply-To: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> To: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bob Duke , John Pruitt , Jonathan Cormier , Krzysztof Kozlowski X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1715; i=jcormier@criticallink.com; h=from:subject:message-id; bh=zommGdK1AE/P2wkRC+Wfs7Ff5ewrg2oHpdh2GCpmvb4=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0v96zdNvjLqjJDJT6uP55wg3FfQKjVKHekgLyJ/H g9+UYSiJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9L/egAKCRDc1/0uCzbrqm5FEA CGCashV5T/gehXbDpyC6N+qeRK93QJKBK3yy4ryoch6+CQLU1jV1e2Nm2Lget6jA7r8WvFD/JYiktZ EA1YE0dvxdntUT5l92NeBnRsnvF/osVZOWiy//mp363XuQ1XmqWSjdV49lmiEV8U3MtR7T6v3Un3pf +qHaF6h9BkSCjoZDuo4yi3ZrWHTHQz7YHPhcRnwo1hJ81wVt0K1+L0Pvch2cK3oWgrqQzto4f2JeBe vWuMn528NyfLnC5HJMOc5fjbDUoADlE7dcEmnyitrRTx4xZOHL0V+Y1WeZsdV2OhYLCeHZd2bTS2I0 1PRBgpUMfDI51vJftqm4DH6BNTDRYF2n0ar9J/7KEA+L32eU+/GhejGGzSONu2rW1/6rQXBxcAJXiE OKec5CU7dcXLN0j2RU2qSD6cZpTSRsRlh8aGO6o3lNiBD2rDz0+9+OeN9rDxz0mCBdKVu94zBNdJG3 VpiUkoaolGWhqWvje6zIb1VCY9u/0i//+6NB/+pofpwFR8XqrDyf0OvRsjIXFH3svI0Y78wwhBpops egwbN3FeiEMaa2z5KRrO1iuR46IAoBYDzDsbPiREr4fi7RRMqVHxe3GvlhxMIQu+wtolpWq0U3cVMg TUOxQXklybtJEvajU54xYWmzKoC850y9iYg/ZjT2dYI7V9Uu3PV2/+y3ZA2Q== X-Developer-Key: i=jcormier@criticallink.com; a=openpgp; fpr=FF328CEA09E66D63136754DFDCD7FD2E0B36EBAA Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Create initial binding for the LTC2945 I2C power monitor. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Jonathan Cormier --- .../devicetree/bindings/hwmon/adi,ltc2945.yaml | 49 ++++++++++++++++++= ++++ 1 file changed, 49 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc2945.yaml b/Doc= umentation/devicetree/bindings/hwmon/adi,ltc2945.yaml new file mode 100644 index 000000000000..5cb66e97e816 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/adi,ltc2945.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/adi,ltc2945.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices LTC2945 wide range i2c power monitor + +maintainers: + - Guenter Roeck + +description: | + Analog Devices LTC2945 wide range i2c power monitor over I2C. + + https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2= 945.pdf + +properties: + compatible: + enum: + - adi,ltc2945 + + reg: + maxItems: 1 + + shunt-resistor-micro-ohms: + description: + Shunt resistor value in micro-Ohms + default: 1000 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + power-monitor@6e { + compatible =3D "adi,ltc2945"; + reg =3D <0x6e>; + /* 10 milli-Ohm shunt resistor */ + shunt-resistor-micro-ohms =3D <10000>; + }; + }; +... --=20 2.25.1 From nobody Sun Sep 14 03:32:50 2025 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 61B5DC61D97 for ; Thu, 26 Jan 2023 22:33:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233288AbjAZWdd (ORCPT ); Thu, 26 Jan 2023 17:33:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233232AbjAZWcw (ORCPT ); Thu, 26 Jan 2023 17:32:52 -0500 Received: from mail-qv1-xf2b.google.com (mail-qv1-xf2b.google.com [IPv6:2607:f8b0:4864:20::f2b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D27F9728C1 for ; Thu, 26 Jan 2023 14:32:30 -0800 (PST) Received: by mail-qv1-xf2b.google.com with SMTP id x18so2617423qvl.1 for ; Thu, 26 Jan 2023 14:32:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=criticallink.com; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=4xEhI3axOJYS2dd9mxNrX3agzmt2SZlxn5ns5AzUH58=; b=cEzkNNjy9xdn2V+pJO12CL+zMeml5aYU0d5MSRymk3vzhECNfnAxv1i6QuiVcSung9 HKYXTxKhnCqIQpI5WID+qZM4HBfq75uXYeRVOoN7J9VOOhb2MbC8GUJ8z/vwK6MgWhH7 l8zzsyqzuNrtLFoh3MogI7R9KgSFwfyb4ysrZsOHEm/e3CaNdURMwSmuG0z3LXh9UuMv SIFOhIVuYksdSG/fttoK7FrudzTxSUuMREd/wnDFhDhCeb2LyBH+0i1AtDuYb+rPg1hK vwF81gE0fo/5zvsSrS9iRVv3ZT/m0zAGoqQCLHd+YqYcyJ+Jm6FRe2j8+3DYT0RorNsL cyIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4xEhI3axOJYS2dd9mxNrX3agzmt2SZlxn5ns5AzUH58=; b=JfbfRDonb7kB+2lMmghxTPVsvmeZgGH4X+LLDQw03a1o79iQ0yA5LBwmYEX67De6kP oTYrGufMjuKvwDjOu08axc7QG8WfhnusqgQLJoqPngp9foUmtN19C4fjblzlvjOYrUYL tceD8K9X0JA/BQncPBeYcTMUCOQ6mEJ8MpcPCSKhEvCnxkboPayTMqNrWtN729aPvqnw zOWsW7o3vnlEmh0zxJTA60zGh7up4JA4VH06rzUtPOXFVJTD+JJaTPoJG0Sb52OD1H5k NB1lsybSLjQOsqu4hHtbcDguhrqMOGPs6EcHptboSL5xfqAJFElWZ0FLc/DNxE6gLVVW Rmgg== X-Gm-Message-State: AFqh2koTby+YvdC4qx23B5+YPOyXl3Mp0IvmkBly3I93b8Lla4TmWvIn Wmcqq44qN/JQv+WoSgDvpOS0kQ== X-Google-Smtp-Source: AMrXdXuzBOyI5/KyWaygGhCjxZsF6FqdobUQud3r/7841g2Ny78wWU6KYvEP1doyOL2yMhzPTNjRZA== X-Received: by 2002:a05:6214:4287:b0:535:2d28:bf1d with SMTP id og7-20020a056214428700b005352d28bf1dmr61600177qvb.33.1674772349768; Thu, 26 Jan 2023 14:32:29 -0800 (PST) Received: from [127.0.1.1] (static-72-90-70-109.syrcny.fios.verizon.net. [72.90.70.109]) by smtp.gmail.com with ESMTPSA id m7-20020a05620a220700b006ff8a122a1asm1723091qkh.78.2023.01.26.14.32.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:32:29 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:32:24 -0500 Subject: [PATCH v4 2/5] hwmon: ltc2945: Add devicetree match table MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230126-b4-ltc2945_shunt_resistor-v4-2-bb913470d8da@criticallink.com> References: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> In-Reply-To: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> To: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bob Duke , John Pruitt , Jonathan Cormier X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1025; i=jcormier@criticallink.com; 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+MODULE_DEVICE_TABLE(of, ltc2945_of_match); + static inline bool is_power_reg(u8 reg) { return reg < LTC2945_SENSE_H; @@ -475,8 +481,9 @@ MODULE_DEVICE_TABLE(i2c, ltc2945_id); =20 static struct i2c_driver ltc2945_driver =3D { .driver =3D { - .name =3D "ltc2945", - }, + .name =3D "ltc2945", + .of_match_table =3D of_match_ptr(ltc2945_of_match), + }, .probe_new =3D ltc2945_probe, .id_table =3D ltc2945_id, }; --=20 2.25.1 From nobody Sun Sep 14 03:32:50 2025 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 1D28AC54EAA for ; Thu, 26 Jan 2023 22:33:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233274AbjAZWda (ORCPT ); Thu, 26 Jan 2023 17:33:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33814 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233235AbjAZWcw (ORCPT ); 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[72.90.70.109]) by smtp.gmail.com with ESMTPSA id m7-20020a05620a220700b006ff8a122a1asm1723091qkh.78.2023.01.26.14.32.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:32:30 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:32:25 -0500 Subject: [PATCH v4 3/5] hwmon: ltc2945: Handle error case in ltc2945_value_store MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230126-b4-ltc2945_shunt_resistor-v4-3-bb913470d8da@criticallink.com> References: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> In-Reply-To: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> To: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bob Duke , John Pruitt , Jonathan Cormier X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=867; i=jcormier@criticallink.com; h=from:subject:message-id; bh=SzzENIrGiaejxh+uQZSs7e+ccCHGcUqjL1/OnwF5OmY=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0v96I9AKEpN83mKapP1hTRkeYHRy84kppIwH+CdQ eL5pKQiJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9L/egAKCRDc1/0uCzbrqudhEA CuNh+CQew2a5gTfSFibY46D0O2N0QAEvr3Rsa0msLInZGzGb/Q37NW4Bek/e1UDQ9akNCC5edWUmSV leReoDCSY5V6auNoZggWimfdebz5pXtmZMoci4TLpq9opdQZ7M9ZR2yu50sPMN25UX+U+fSdjPJ/9F ZcOFS8a9dhWg9E40XXJdAqo3GjZG9+REU/Amh1e4I3JX4QZwHgxLgiVvhPuVW0A8p8TJRStovoi/4c m1l0sz3XYRhtQeEpuw1Kp5BVpG3s1ZVRQSLU2qVPs6/+myvT55V01RoDUkWmq98y0EzhAoKPVmHQ03 gF04Un76awayLjOYjEMUlKLAXPqnq32cwHLqCrmWN6OFO6cx+ckxI6OvlNQ08g+MrnrxPJfk+afSRl tjJZXx9rMNAHw5ZJi7dzOlBqrZivp4qVViLKPDWWdA2iXTpnInPf1IgZc7eKX+s1JPc6y00U4V4pTm +QCYQROzi/dRarcDB+FjkTUG0AaXG8Oa6mCIiIMfOvf7tzKfv2UbXUmgXRRx4pBWdc4U+UlTfT8toO yso+VmuZTXHJv3HaVHkUWSftvvh3SnofhhoR/O7WVXuIQKLQR731wF5y8WfuJmTMyTZ4QFPS+hVLC7 HRbEe8dV9CvuZ+iyYrOf+y184YJzZks7H1NN/4zLU0ze7gofQsjfp+XEVSIQ== X-Developer-Key: i=jcormier@criticallink.com; a=openpgp; fpr=FF328CEA09E66D63136754DFDCD7FD2E0B36EBAA Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ltc2945_val_to_reg errors were not being handled which would have resulted in register being set to 0 (clamped) instead of being left alone. Fixes: 6700ce035f83 ("hwmon: Driver for Linear Technologies LTC2945") Signed-off-by: Jonathan Cormier --- drivers/hwmon/ltc2945.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hwmon/ltc2945.c b/drivers/hwmon/ltc2945.c index 9af3e3821152..ac15298a6558 100644 --- a/drivers/hwmon/ltc2945.c +++ b/drivers/hwmon/ltc2945.c @@ -254,6 +254,8 @@ static ssize_t ltc2945_value_store(struct device *dev, =20 /* convert to register value, then clamp and write result */ regval =3D ltc2945_val_to_reg(dev, reg, val); + if (regval < 0) + return regval; if (is_power_reg(reg)) { regval =3D clamp_val(regval, 0, 0xffffff); regbuf[0] =3D regval >> 16; --=20 2.25.1 From nobody Sun Sep 14 03:32:50 2025 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 CD410C54EAA for ; Thu, 26 Jan 2023 22:33:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233293AbjAZWdg (ORCPT ); Thu, 26 Jan 2023 17:33:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232576AbjAZWcw (ORCPT ); Thu, 26 Jan 2023 17:32:52 -0500 Received: from mail-qv1-xf35.google.com (mail-qv1-xf35.google.com [IPv6:2607:f8b0:4864:20::f35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D504645F5E for ; Thu, 26 Jan 2023 14:32:32 -0800 (PST) Received: by mail-qv1-xf35.google.com with SMTP id h10so2588298qvq.7 for ; Thu, 26 Jan 2023 14:32:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=criticallink.com; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=SCHr8u8LkHFJIdDqjoshO09JHhBWtvWwNk0DDadovgI=; b=TFi70dSxljUji9Q8+lRwOqeik36CcxykG1bkL7Zmf4w+0tfOzcN5b85Yn9/0xi8/Gj sj/I4tMTUr/52yQrbPTK5aruYP4IuMdcqDjtELTU9Bf4/KgwDKbe9h9Vo4ZXVZF1fkBC ZI/cth4gdK1SQ8awl1oUTlgXWExLx1Iyt0cZBEQiw+aQBxRIMMFHr4lcRSk+Zvg4f+y8 ae8jKPwB/UtSxPp0xbI40WchEDa4Ka7ikNQfK500slNPN7y0Mv86dv7Q7k6oDFli0wzw kZtYjh57Gw/V9vHYOmcRAjXA70S8lBR8GrW8AfphZyRzyfF6ehRilbsgdCg4mIg6TTpu 1QWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SCHr8u8LkHFJIdDqjoshO09JHhBWtvWwNk0DDadovgI=; b=zub5W+BKemSgzckjfbAYWHwFNVCU6lUcn07jkdP4Mwj9qQobJxC+WlpW+vlWTsaiLG Qu/jSaRRgp3Q6v2xbnQxKbBup/VA1CeflngfY0rwFu6uLWMWcNsX7oqDF5Y4sd2wcuOP orcXGAokgFfWmv5UMwYperPIZJhXulPzRg9D0kFzt3qYXWypLqgCDZre9B3WmRYx6X0W 2WtmSS/y7vOVyK7tjG//g30KAhsCfkniVLKSCEemdk6qgEPmMb4hsvGMc807wIL7btpl 5m8D0mslnzeWtJwjtfCqDXzhwU7qiwzFG8zubIzI/W2eMxbaBJVrLXtbpUj7WIhtqeTT 4lSw== X-Gm-Message-State: AO0yUKWYrcDtyZYi+q6Y1S5oc2UfNhrgZK+YcEGpGeYDiUYu6Si8Kl1R zF7TPuJsIGLpTJxS4XCbSy1HON9HTA6Cs+5K9Ps= X-Google-Smtp-Source: AK7set+POzIdwC2TjvFXAo8YwyVcG5JoC8xn1J6GK4SISPLu8sV+t8bzgGAq3VE4ublbVe2kxOaNng== X-Received: by 2002:a0c:f812:0:b0:537:8125:b533 with SMTP id r18-20020a0cf812000000b005378125b533mr4687943qvn.34.1674772351923; Thu, 26 Jan 2023 14:32:31 -0800 (PST) Received: from [127.0.1.1] (static-72-90-70-109.syrcny.fios.verizon.net. [72.90.70.109]) by smtp.gmail.com with ESMTPSA id m7-20020a05620a220700b006ff8a122a1asm1723091qkh.78.2023.01.26.14.32.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:32:31 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:32:26 -0500 Subject: [PATCH v4 4/5] hwmon: ltc2945: Allow setting shunt resistor MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230126-b4-ltc2945_shunt_resistor-v4-4-bb913470d8da@criticallink.com> References: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> In-Reply-To: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> To: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bob Duke , John Pruitt , Jonathan Cormier X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=9001; i=jcormier@criticallink.com; h=from:subject:message-id; bh=kCSpCo/P+JFRfq9IZAl6ayWTbbT5LfJiwbvQxfe6g3w=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0v96zFJJWKGHqQesz69ayOn6UqiOCCZzjw53eNx4 YdJI+omJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9L/egAKCRDc1/0uCzbrqkb+EA CCTTrUKXIvVjU0LpKAJFLD/5sUp+4Tg8mMk/H4dslTDJWDfBMPsCYZMxyFzxPgV4leYqaGWZjG6vns UWkFvuveqvD1kESxVbY0NiLZjuCmYe4ZP/0Rl9ycRUrFHmSMIhvpaOhBCkiPY028+bGuFc54bakurO 4txYNTh20oylXaYxx0woWD9K+cdT2zJ3p3F7e2Gbb77HM4rX98HpFC1RvMN03P42ImbaXWGgO+F0h8 5ihdlmfMMAqGiWNiVmv4++1eldYEYl+c8LrjrwSDbZewxCX6OD/y0xF9atczAWBzILF8H5wo3VQRBU VJCCyGWyZxoAeKrVAsovjs+2IO2O2A4BDCu0Mn0hxnYfodlvUYNDl1Rxc45PKFPzVDPTEQRzFfqhLv JFp29d2SdlYNesKPDoSrliGql1cOvhLBSd7pW6kVYLN0q3Y0RXt0nW0Rsjzh9oqaf0ZluhY5LadAHo UgsZNMVLMNZUAMPomN/sDwROHbspJvCYWqv84PgEHG1dwX54rCPI6Ln/FsBNk35DdNStMsh+Pjnscl JQYmNIAchqr6Xf6xniLxWNKZaFL38j4nWBYe+HygM7efrVxwe6IMImIEoTwuLEV/zxH2CjZfHB6ZeN wp90D1H0WnxpxuaUYYXXqDJ5YCRig4NyaboWviqrNd0Aj+tVRJ4E3oXOFVsw== X-Developer-Key: i=jcormier@criticallink.com; a=openpgp; fpr=FF328CEA09E66D63136754DFDCD7FD2E0B36EBAA Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: John Pruitt Add the ability to specify the value of the shunt resistor in the device tree instead of assuming it is 1 milliOhm. The value in the device tree has the name shunt-resistor-micro-ohms and the default value is 1000 micro-ohms in order to preserve the current behavior. Signed-off-by: Jonathan Cormier Signed-off-by: John Pruitt --- drivers/hwmon/ltc2945.c | 117 +++++++++++++++++++++++++++++++-------------= ---- 1 file changed, 75 insertions(+), 42 deletions(-) diff --git a/drivers/hwmon/ltc2945.c b/drivers/hwmon/ltc2945.c index ac15298a6558..0b5e448b4f12 100644 --- a/drivers/hwmon/ltc2945.c +++ b/drivers/hwmon/ltc2945.c @@ -64,6 +64,16 @@ static const struct of_device_id __maybe_unused ltc2945_= of_match[] =3D { }; MODULE_DEVICE_TABLE(of, ltc2945_of_match); =20 +/** + * struct ltc2945_data - LTC2945 device data + * @regmap: regmap device + * @shunt_resistor: shunt resistor value in micro ohms (1000 by default) + */ +struct ltc2945_data { + struct regmap *regmap; + u32 shunt_resistor; +}; + static inline bool is_power_reg(u8 reg) { return reg < LTC2945_SENSE_H; @@ -72,7 +82,9 @@ static inline bool is_power_reg(u8 reg) /* Return the value from the given register in uW, mV, or mA */ static long long ltc2945_reg_to_val(struct device *dev, u8 reg) { - struct regmap *regmap =3D dev_get_drvdata(dev); + struct ltc2945_data *data =3D dev_get_drvdata(dev); + struct regmap *regmap =3D data->regmap; + u32 shunt_resistor =3D data->shunt_resistor; unsigned int control; u8 buf[3]; long long val; @@ -84,10 +96,10 @@ static long long ltc2945_reg_to_val(struct device *dev,= u8 reg) return ret; =20 if (is_power_reg(reg)) { - /* power */ + /* 24-bit power */ val =3D (buf[0] << 16) + (buf[1] << 8) + buf[2]; } else { - /* current, voltage */ + /* 12-bit current, voltage */ val =3D (buf[0] << 4) + (buf[1] >> 4); } =20 @@ -98,9 +110,7 @@ static long long ltc2945_reg_to_val(struct device *dev, = u8 reg) case LTC2945_MAX_POWER_THRES_H: case LTC2945_MIN_POWER_THRES_H: /* - * Convert to uW by assuming current is measured with - * an 1mOhm sense resistor, similar to current - * measurements. + * Convert to uW * Control register bit 0 selects if voltage at SENSE+/VDD * or voltage at ADIN is used to measure power. */ @@ -114,6 +124,14 @@ static long long ltc2945_reg_to_val(struct device *dev= , u8 reg) /* 0.5 mV * 25 uV =3D 0.0125 uV resolution. */ val =3D (val * 25LL) >> 1; } + val *=3D 1000; + /* Overflow check: Assuming max 24-bit power, val is at most 53 bits rig= ht now. */ + val =3D DIV_ROUND_CLOSEST_ULL(val, shunt_resistor); + /* + * Overflow check: After division, depending on shunt resistor, + * val can still be > 32 bits so returning long long makes sense + */ + break; case LTC2945_VIN_H: case LTC2945_MAX_VIN_H: @@ -136,14 +154,11 @@ static long long ltc2945_reg_to_val(struct device *de= v, u8 reg) case LTC2945_MIN_SENSE_H: case LTC2945_MAX_SENSE_THRES_H: case LTC2945_MIN_SENSE_THRES_H: - /* - * 25 uV resolution. Convert to current as measured with - * an 1 mOhm sense resistor, in mA. If a different sense - * resistor is installed, calculate the actual current by - * dividing the reported current by the sense resistor value - * in mOhm. - */ - val *=3D 25; + /* 25 uV resolution. Convert to mA. */ + val *=3D 25 * 1000; + /* Overflow check: Assuming max 12-bit sense, val is at most 27 bits rig= ht now */ + val =3D DIV_ROUND_CLOSEST_ULL(val, shunt_resistor); + /* Overflow check: After division, <=3D 27 bits */ break; default: return -EINVAL; @@ -151,13 +166,18 @@ static long long ltc2945_reg_to_val(struct device *de= v, u8 reg) return val; } =20 -static int ltc2945_val_to_reg(struct device *dev, u8 reg, - unsigned long val) +static long long ltc2945_val_to_reg(struct device *dev, u8 reg, + unsigned long long val) { - struct regmap *regmap =3D dev_get_drvdata(dev); + struct ltc2945_data *data =3D dev_get_drvdata(dev); + struct regmap *regmap =3D data->regmap; + u32 shunt_resistor =3D data->shunt_resistor; unsigned int control; int ret; =20 + /* Ensure we don't overflow */ + val =3D clamp_val(val, 0, U32_MAX); + switch (reg) { case LTC2945_POWER_H: case LTC2945_MAX_POWER_H: @@ -165,9 +185,6 @@ static int ltc2945_val_to_reg(struct device *dev, u8 re= g, case LTC2945_MAX_POWER_THRES_H: case LTC2945_MIN_POWER_THRES_H: /* - * Convert to register value by assuming current is measured - * with an 1mOhm sense resistor, similar to current - * measurements. * Control register bit 0 selects if voltage at SENSE+/VDD * or voltage at ADIN is used to measure power, which in turn * determines register calculations. @@ -177,14 +194,16 @@ static int ltc2945_val_to_reg(struct device *dev, u8 = reg, return ret; if (control & CONTROL_MULT_SELECT) { /* 25 mV * 25 uV =3D 0.625 uV resolution. */ - val =3D DIV_ROUND_CLOSEST(val, 625); + val *=3D shunt_resistor; + /* Overflow check: Assuming 32-bit val and shunt resistor, val <=3D 64b= its */ + val =3D DIV_ROUND_CLOSEST_ULL(val, 625 * 1000); + /* Overflow check: val is now <=3D 44 bits */ } else { - /* - * 0.5 mV * 25 uV =3D 0.0125 uV resolution. - * Divide first to avoid overflow; - * accept loss of accuracy. - */ - val =3D DIV_ROUND_CLOSEST(val, 25) * 2; + /* 0.5 mV * 25 uV =3D 0.0125 uV resolution. */ + val *=3D shunt_resistor; + /* Overflow check: Assuming 32-bit val and shunt resistor, val <=3D 64b= its */ + val =3D DIV_ROUND_CLOSEST_ULL(val, 25 * 1000) * 2; + /* Overflow check: val is now <=3D 51 bits */ } break; case LTC2945_VIN_H: @@ -208,14 +227,11 @@ static int ltc2945_val_to_reg(struct device *dev, u8 = reg, case LTC2945_MIN_SENSE_H: case LTC2945_MAX_SENSE_THRES_H: case LTC2945_MIN_SENSE_THRES_H: - /* - * 25 uV resolution. Convert to current as measured with - * an 1 mOhm sense resistor, in mA. If a different sense - * resistor is installed, calculate the actual current by - * dividing the reported current by the sense resistor value - * in mOhm. - */ - val =3D DIV_ROUND_CLOSEST(val, 25); + /* 25 uV resolution. Convert to mA. */ + val *=3D shunt_resistor; + /* Overflow check: Assuming 32-bit val and 32-bit shunt resistor, val is= 64bits */ + val =3D DIV_ROUND_CLOSEST_ULL(val, 25 * 1000); + /* Overflow check: val is now <=3D 50 bits */ break; default: return -EINVAL; @@ -240,15 +256,16 @@ static ssize_t ltc2945_value_store(struct device *dev, const char *buf, size_t count) { struct sensor_device_attribute *attr =3D to_sensor_dev_attr(da); - struct regmap *regmap =3D dev_get_drvdata(dev); + struct ltc2945_data *data =3D dev_get_drvdata(dev); + struct regmap *regmap =3D data->regmap; u8 reg =3D attr->index; - unsigned long val; + unsigned int val; u8 regbuf[3]; int num_regs; - int regval; + long long regval; int ret; =20 - ret =3D kstrtoul(buf, 10, &val); + ret =3D kstrtouint(buf, 10, &val); if (ret) return ret; =20 @@ -277,7 +294,8 @@ static ssize_t ltc2945_history_store(struct device *dev, const char *buf, size_t count) { struct sensor_device_attribute *attr =3D to_sensor_dev_attr(da); - struct regmap *regmap =3D dev_get_drvdata(dev); + struct ltc2945_data *data =3D dev_get_drvdata(dev); + struct regmap *regmap =3D data->regmap; u8 reg =3D attr->index; int num_regs =3D is_power_reg(reg) ? 3 : 2; u8 buf_min[3] =3D { 0xff, 0xff, 0xff }; @@ -329,7 +347,8 @@ static ssize_t ltc2945_bool_show(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr =3D to_sensor_dev_attr(da); - struct regmap *regmap =3D dev_get_drvdata(dev); + struct ltc2945_data *data =3D dev_get_drvdata(dev); + struct regmap *regmap =3D data->regmap; unsigned int fault; int ret; =20 @@ -458,6 +477,12 @@ static int ltc2945_probe(struct i2c_client *client) struct device *dev =3D &client->dev; struct device *hwmon_dev; struct regmap *regmap; + struct ltc2945_data *data; + + data =3D devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + dev_set_drvdata(dev, data); =20 regmap =3D devm_regmap_init_i2c(client, <c2945_regmap_config); if (IS_ERR(regmap)) { @@ -465,11 +490,19 @@ static int ltc2945_probe(struct i2c_client *client) return PTR_ERR(regmap); } =20 + data->regmap =3D regmap; + if (device_property_read_u32(dev, "shunt-resistor-micro-ohms", + &data->shunt_resistor)) + data->shunt_resistor =3D 1000; + + if (data->shunt_resistor =3D=3D 0) + return -EINVAL; + /* Clear faults */ regmap_write(regmap, LTC2945_FAULT, 0x00); =20 hwmon_dev =3D devm_hwmon_device_register_with_groups(dev, client->name, - regmap, + data, ltc2945_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } --=20 2.25.1 From nobody Sun Sep 14 03:32:50 2025 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 67B7CC54EAA for ; Thu, 26 Jan 2023 22:33:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233300AbjAZWdn (ORCPT ); Thu, 26 Jan 2023 17:33:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233184AbjAZWcx (ORCPT ); Thu, 26 Jan 2023 17:32:53 -0500 Received: from mail-qv1-xf35.google.com (mail-qv1-xf35.google.com [IPv6:2607:f8b0:4864:20::f35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 738964C3F for ; Thu, 26 Jan 2023 14:32:33 -0800 (PST) Received: by mail-qv1-xf35.google.com with SMTP id d13so2587084qvj.8 for ; Thu, 26 Jan 2023 14:32:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=criticallink.com; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=SMXyMh+Lwz3neJnqgLoV44iMFdZ/93CQTC6eXheel78=; b=khx+stdm8gj3hVORCp3vGGwzfpFUtfpBgTEIanFn6fjEYFTnrg3+LJgDpc96HX/Ty7 4r8nwbwrUYp33LQaJHweQcEKn8jjR8j7kqqFxk55wQLrkNkkwZMLgPnXhCBVRRB8wRD4 YjNo3Y7rVbe+cT8kXRVPzB/FCCBY+8JRM2SHLeXxJjRUndyxqED4/EVnvYQLPafZmOBE fHQiMZuR+zPKShSVcp/k9YHvED3hQ0szFF+oWdaqPwNspv/2yQ37ogMmIOdWaKo9p/fJ +etDkPnrFgxbbafSb+giy1XA1g061fGgoHhmDN1gVZcc0AAm7jZ4fpNeMg9fv5eL8TQW IfrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SMXyMh+Lwz3neJnqgLoV44iMFdZ/93CQTC6eXheel78=; b=PkZLAfIJ+e2SZcK+d3VCEbqIzEtILx0w8r0t5WNnriheuK4m/1Ou8l/dmKK5+OvVM5 wj7JkLbWPg/EeXZ23S6b0a2O17FmlmptjErMUXy55oK1a5cuzxVcbbnmvrJw2u44mbNl ucH+Dak1nlaEHSeAL7qX0xvmyRLV0HrEh5T/cIbmPt7b6ig+K+RIS3qNd3wvKAc3okDN ESpQjkCealjtdka1V8JS5N5JlwujQP+5/+T/59crM+u1lbgl+aScWbNMYJOFJDgW1C3J iwWFlYSyAKlzKf5t8uwKvPVOY7Rd8eziMn23puN+nYrWTfK3f7CSWx7bki2a7KHcaStG n40g== X-Gm-Message-State: AFqh2kqkcuPm+cgsSBnAoZWNpscBvobyLPDDeqVJMtv0xYs3vIBA3WC3 IOFhr4hQYD7YT3IN0wLjDLiCrg== X-Google-Smtp-Source: AMrXdXuGmsLBqfAHwn5t37b9KDNwt3R6jfn4nDAVPNlKXvZkF7hctLEEKstGiDeMd9zvJeYTrKdZ+Q== X-Received: by 2002:a05:6214:3492:b0:534:2b55:6320 with SMTP id mr18-20020a056214349200b005342b556320mr55824540qvb.9.1674772353054; Thu, 26 Jan 2023 14:32:33 -0800 (PST) Received: from [127.0.1.1] (static-72-90-70-109.syrcny.fios.verizon.net. [72.90.70.109]) by smtp.gmail.com with ESMTPSA id m7-20020a05620a220700b006ff8a122a1asm1723091qkh.78.2023.01.26.14.32.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:32:32 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:32:27 -0500 Subject: [PATCH v4 5/5] hwmon: ltc2945: Convert division to DIV_ROUND_CLOSEST_ULL MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230126-b4-ltc2945_shunt_resistor-v4-5-bb913470d8da@criticallink.com> References: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> In-Reply-To: <20230126-b4-ltc2945_shunt_resistor-v4-0-bb913470d8da@criticallink.com> To: Jean Delvare , Guenter Roeck , Rob Herring , Krzysztof Kozlowski Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bob Duke , John Pruitt , Jonathan Cormier X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=708; i=jcormier@criticallink.com; h=from:subject:message-id; bh=ztSizwKCRQbuO5hjHb+ixZi9TnHDXa8I5HXLLGMpWUk=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0v96Md1xv21n7cR5HEwD5IPLFz0I12Y2BnjVI/ES HP4bOeCJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9L/egAKCRDc1/0uCzbrqoLlD/ wNZmu751rOnzdh7g2RQ5g7eZ3Y51D8vPnAwxHLHA8qgc1jAv7nVp4+T4xtxMyfbrI8R8VNK0PM8NLe l/expSHT30K8SZhxjrLn7r5AdiAh2jOLIxPCbMTnf4ZSZOAAViy9YUhLFpg94Qa9bNOVupLDd6p3ml QJuuW4HoPRJkcjetV/cQLrHhkdcJd/fxExAnQABDGltSrKhbIFDwVVKxkOhgAzCs4QiZgB91KWpdei sa5xVLscph09wvnHjkKGG1hIK0pISajE9GIBPdM1R7ek8rdhQCU3jblxIkQxDFnjWHgjE01V2W9HQ1 5NOM8sFqobmMsOyr4S8h6Y+Kcikh6HGZRdquU+oMQy+c6Y97VH4gG24ZWTNhNxau3qIVJcCb4Cmv2m KWYrNfJCNe3zF7wN0qy7D4WT2aVhRWGHZCGztcQdhg6CMc+jESLjuc4maOg0pxjh8mKOledXGK6LLm 3nKoCUicm14yoD6vnCcHB+FuZLc+o1crK/+UmOTKEYbzMY79FNEHQNfx90bs+qz0wOzdG70lb11OqU /OcejxRTDxEHxdsXj7p29v1a/NOfvUrzW0rmZqoNdGB1kESXI+bOINOhSyWeb9TUAfmQYC4rISi15G FTTLoHHR5blXPO0dLrzaJ9g6O2dO/ZiTKmUEQAwYDQmUuy2sZdn+acrXVrXg== X-Developer-Key: i=jcormier@criticallink.com; a=openpgp; fpr=FF328CEA09E66D63136754DFDCD7FD2E0B36EBAA Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Convert division to DIV_ROUND_CLOSEST_ULL to match code in same function. Signed-off-by: Jonathan Cormier --- drivers/hwmon/ltc2945.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwmon/ltc2945.c b/drivers/hwmon/ltc2945.c index 0b5e448b4f12..33341d01f1f7 100644 --- a/drivers/hwmon/ltc2945.c +++ b/drivers/hwmon/ltc2945.c @@ -212,7 +212,7 @@ static long long ltc2945_val_to_reg(struct device *dev,= u8 reg, case LTC2945_MAX_VIN_THRES_H: case LTC2945_MIN_VIN_THRES_H: /* 25 mV resolution. */ - val /=3D 25; + val =3D DIV_ROUND_CLOSEST_ULL(val, 25); break; case LTC2945_ADIN_H: case LTC2945_MAX_ADIN_H: --=20 2.25.1