From patchwork Tue Jul 9 11:58:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Potin Lai X-Patchwork-Id: 1958384 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20230601 header.b=XghQg7gm; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WJKN10gMWz1xpd for ; Tue, 9 Jul 2024 22:01:35 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20230601 header.b=XghQg7gm; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WJKMx6jbBz3cVf for ; Tue, 9 Jul 2024 22:01:33 +1000 (AEST) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20230601 header.b=XghQg7gm; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::531; helo=mail-pg1-x531.google.com; envelope-from=potin.lai.pt@gmail.com; receiver=lists.ozlabs.org) Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4WJKMW4GmLz3bSx for ; Tue, 9 Jul 2024 22:01:10 +1000 (AEST) Received: by mail-pg1-x531.google.com with SMTP id 41be03b00d2f7-710437d0affso2811339a12.3 for ; Tue, 09 Jul 2024 05:01:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1720526467; x=1721131267; darn=lists.ozlabs.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=qP9f43kIzSKZ91kqEnwKN1IG5h5Ja5VfHh3wwkRy1S4=; b=XghQg7gm5UUu8YOmKeTSMl4/Oh8yIChp2PKc53lWnPDHcSQqT1AZQHz8HO6cRri9+H oKupg75vELp/YS64dtxaOiy1qykDlb1QxGskLVvCWfwMcQHQRVD9AmViWtrB2l23o33f FBghw9T6UO0K5WK+IDbWwZquYaEKsz0ICdwdW9KpO7GLIU0NlLv0Y794X7RH4JOR6nNh YkuqSX30gJRcTKUjwlSDWAS8+S1NCGDnyZ5mgrPk21DVANrgHPM9Jdl1A0Gzm8P1J9FX FiieCYnn3tNo/F+84B7g6WcP06bGXld1G7YaC2O7zYjBT32O12JG+OSCIfhOAvcLDGh/ dpNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720526467; x=1721131267; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qP9f43kIzSKZ91kqEnwKN1IG5h5Ja5VfHh3wwkRy1S4=; b=SAhXefw3iSQxE0e72RXiZHV0rMgiGPnOczel27BHT/6SedYh0iEWu4oi+6yOSEB4+T gRQWByLr4X1QizIlw21kY0Uw3souXctVfFXIXM3nltPTVdZFv34XIA+HS+x8i6Z+oZNh 4Y5C+8QSTbCSUW0jsIDYFhZab8cRwy/FnItlvHHV0DsykrPyS5JZyEJq5uMu9hcv7I4q YmSeeBGhHc3BV8PgEahGRDBUnyFoMmRK/ipCCpE+TwYPi3vBbUWJWEQKUKPMYuf5O6AA TVzvNJ1GF9yDQaebmBn/sU2Hy0THVci2VT3JM7D8FhHnZIfM9cqt+/UyT5+s4kGcHyRb s/Tg== X-Gm-Message-State: AOJu0Yz7dweos+vOMUcTYY0rwaCsHzmSwq8I1EiEC0x+HyeypB/N8GVC i5jdkUHOymaYIs+iIdwFgdb2HyKnCoomBM5ijgEvgVLFt9ZSu0zL1Kb4HWfO X-Google-Smtp-Source: AGHT+IEuJD4M0gB/n8ATfGPC8iEWHGN/URyJQz3s7KQDfMdldAkFaf6JKQNTljlZocSA5DzpjeFjyw== X-Received: by 2002:a05:6a20:6a0e:b0:1c0:ed64:e4a9 with SMTP id adf61e73a8af0-1c29824f039mr2748192637.34.1720526466595; Tue, 09 Jul 2024 05:01:06 -0700 (PDT) Received: from localhost.localdomain (61-220-246-151.hinet-ip.hinet.net. [61.220.246.151]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fbb6acf780sm14495165ad.252.2024.07.09.05.01.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jul 2024 05:01:05 -0700 (PDT) From: Potin Lai To: openbmc@lists.ozlabs.org, joel@jms.id.au, andrew@aj.id.au Subject: [PATCH linux dev-6.6 2/2] hwmon: pmbus: Add ltc4286 driver Date: Tue, 9 Jul 2024 19:58:55 +0800 Message-Id: <20240709115855.17623-3-potin.lai.pt@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240709115855.17623-1-potin.lai.pt@gmail.com> References: <20240709115855.17623-1-potin.lai.pt@gmail.com> MIME-Version: 1.0 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" From: Delphine CC Chiu Add a driver to support ltc4286 chip Signed-off-by: Delphine CC Chiu --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/ltc4286.rst | 95 +++++++++++++++++ drivers/hwmon/pmbus/Kconfig | 10 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/ltc4286.c | 176 ++++++++++++++++++++++++++++++++ 5 files changed, 283 insertions(+) create mode 100644 Documentation/hwmon/ltc4286.rst create mode 100644 drivers/hwmon/pmbus/ltc4286.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index b4d8513b11fcd..ec6e517166943 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -128,6 +128,7 @@ Hardware Monitoring Kernel Drivers ltc4245 ltc4260 ltc4261 + ltc4286 max127 max15301 max16064 diff --git a/Documentation/hwmon/ltc4286.rst b/Documentation/hwmon/ltc4286.rst new file mode 100644 index 0000000000000..2cd149676d863 --- /dev/null +++ b/Documentation/hwmon/ltc4286.rst @@ -0,0 +1,95 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver ltc4286 +===================== + +Supported chips: + + * Analog Devices LTC4286 + + Prefix: 'ltc4286' + + Addresses scanned: - + + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4286.pdf + + * Analog Devices LTC4287 + + Prefix: 'ltc4287' + + Addresses scanned: - + + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4287.pdf + +Author: Delphine CC Chiu + + +Description +----------- + +This driver supports hardware monitoring for Analog Devices LTC4286 +and LTC4287 Hot-Swap Controller and Digital Power Monitors. + +LTC4286 and LTC4287 are hot-swap controllers that allow a circuit board +to be removed from or inserted into a live backplane. They also feature +current and voltage readback via an integrated 12 bit analog-to-digital +converter (ADC), accessed using a PMBus interface. + +The driver is a client driver to the core PMBus driver. Please see +Documentation/hwmon/pmbus.rst for details on PMBus client drivers. + + +Usage Notes +----------- + +This driver does not auto-detect devices. You will have to instantiate the +devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for +details. + +The shunt value in micro-ohms can be set via device tree at compile-time. Please +refer to the Documentation/devicetree/bindings/hwmon/lltc,ltc4286.yaml for bindings +if the device tree is used. + + +Platform data support +--------------------- + +The driver supports standard PMBus driver platform data. Please see +Documentation/hwmon/pmbus.rst for details. + + +Sysfs entries +------------- + +The following attributes are supported. Limits are read-write, history reset +attributes are write-only, all other attributes are read-only. + +======================= ======================================================= +in1_label "vin" +in1_input Measured voltage. +in1_alarm Input voltage alarm. +in1_min Minimum input voltage. +in1_max Maximum input voltage. + +in2_label "vout1" +in2_input Measured voltage. +in2_alarm Output voltage alarm. +in2_min Minimum output voltage. +in2_max Maximum output voltage. + +curr1_label "iout1" +curr1_input Measured current. +curr1_alarm Output current alarm. +curr1_max Maximum current. + +power1_label "pin" +power1_input Input power. +power1_alarm Input power alarm. +power1_max Maximum poewr. + +temp1_input Chip temperature. +temp1_min Minimum chip temperature. +temp1_max Maximum chip temperature. +temp1_crit Critical chip temperature. +temp1_alarm Chip temperature alarm. +======================= ======================================================= diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index daf0ecb1058b5..1030e94f97662 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -227,6 +227,16 @@ config SENSORS_LTC3815 This driver can also be built as a module. If so, the module will be called ltc3815. +config SENSORS_LTC4286 + bool "Analog Devices LTC4286" + help + LTC4286 is an integrated solution for hot swap applications that + allows a board to be safely inserted and removed from a live + backplane. + This chip could be used to monitor voltage, current, ...etc. + If you say yes here you get hardware monitoring support for Analog + Devices LTC4286. + config SENSORS_MAX15301 tristate "Maxim MAX15301" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index b78cedb133c8e..9dbda31d3343f 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_LM25066) += lm25066.o obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o +obj-$(CONFIG_SENSORS_LTC4286) += ltc4286.o obj-$(CONFIG_SENSORS_MAX15301) += max15301.o obj-$(CONFIG_SENSORS_MAX16064) += max16064.o obj-$(CONFIG_SENSORS_MAX16601) += max16601.o diff --git a/drivers/hwmon/pmbus/ltc4286.c b/drivers/hwmon/pmbus/ltc4286.c new file mode 100644 index 0000000000000..5c122d5d0f7d7 --- /dev/null +++ b/drivers/hwmon/pmbus/ltc4286.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include +#include "pmbus.h" + +/* LTC4286 register */ +#define LTC4286_MFR_CONFIG1 0xF2 + +/* LTC4286 configuration */ +#define VRANGE_SELECT_BIT BIT(1) + +#define LTC4286_MFR_ID_SIZE 3 + +/* + * Initialize the MBR as default settings which is referred to LTC4286 datasheet + * (March 22, 2022 version) table 3 page 16 + */ +static struct pmbus_driver_info ltc4286_info = { + .pages = 1, + .format[PSC_VOLTAGE_IN] = direct, + .format[PSC_VOLTAGE_OUT] = direct, + .format[PSC_CURRENT_OUT] = direct, + .format[PSC_POWER] = direct, + .format[PSC_TEMPERATURE] = direct, + .m[PSC_VOLTAGE_IN] = 32, + .b[PSC_VOLTAGE_IN] = 0, + .R[PSC_VOLTAGE_IN] = 1, + .m[PSC_VOLTAGE_OUT] = 32, + .b[PSC_VOLTAGE_OUT] = 0, + .R[PSC_VOLTAGE_OUT] = 1, + .m[PSC_CURRENT_OUT] = 1024, + .b[PSC_CURRENT_OUT] = 0, + /* + * The rsense value used in MBR formula in LTC4286 datasheet should be ohm unit. + * However, the rsense value that user input is micro ohm. + * Thus, the MBR setting which involves rsense should be shifted by 6 digits. + */ + .R[PSC_CURRENT_OUT] = 3 - 6, + .m[PSC_POWER] = 1, + .b[PSC_POWER] = 0, + /* + * The rsense value used in MBR formula in LTC4286 datasheet should be ohm unit. + * However, the rsense value that user input is micro ohm. + * Thus, the MBR setting which involves rsense should be shifted by 6 digits. + */ + .R[PSC_POWER] = 4 - 6, + .m[PSC_TEMPERATURE] = 1, + .b[PSC_TEMPERATURE] = 273, + .R[PSC_TEMPERATURE] = 0, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | + PMBUS_HAVE_PIN | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP, +}; + +static const struct i2c_device_id ltc4286_id[] = { + { "ltc4286", 0 }, + { "ltc4287", 1 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, ltc4286_id); + +static int ltc4286_probe(struct i2c_client *client) +{ + int ret; + const struct i2c_device_id *mid; + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; + struct pmbus_driver_info *info; + u32 rsense; + int vrange_nval, vrange_oval; + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer); + if (ret < 0) { + return dev_err_probe(&client->dev, ret, + "Failed to read manufacturer id\n"); + } + + /* + * Refer to ltc4286 datasheet page 20 + * the manufacturer id is LTC + */ + if (ret != LTC4286_MFR_ID_SIZE || + strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) { + return dev_err_probe(&client->dev, ret, + "Manufacturer id mismatch\n"); + } + + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer); + if (ret < 0) { + return dev_err_probe(&client->dev, ret, + "Failed to read manufacturer model\n"); + } + + for (mid = ltc4286_id; mid->name[0]; mid++) { + if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) + break; + } + if (!mid->name[0]) + return dev_err_probe(&client->dev, -ENODEV, + "Unsupported device\n"); + + if (of_property_read_u32(client->dev.of_node, + "shunt-resistor-micro-ohms", &rsense)) + rsense = 300; /* 0.3 mOhm if not set via DT */ + + if (rsense == 0) + return -EINVAL; + + /* Check for the latter MBR value won't overflow */ + if (rsense > (INT_MAX / 1024)) + return -EINVAL; + + info = devm_kmemdup(&client->dev, <c4286_info, sizeof(*info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + /* Check MFR1 CONFIG register bit 1 VRANGE_SELECT before driver loading */ + vrange_oval = i2c_smbus_read_word_data(client, LTC4286_MFR_CONFIG1); + if (vrange_oval < 0) + return dev_err_probe( + &client->dev, vrange_oval, + "Failed to read manufacturer configuration one\n"); + vrange_nval = vrange_oval; + + if (device_property_read_bool(&client->dev, "adi,vrange-low-enable")) { + vrange_nval &= + ~VRANGE_SELECT_BIT; /* VRANGE_SELECT = 0, 25.6 volts */ + + info->m[PSC_VOLTAGE_IN] = 128; + info->m[PSC_VOLTAGE_OUT] = 128; + info->m[PSC_POWER] = 4 * rsense; + } else { + vrange_nval |= + VRANGE_SELECT_BIT; /* VRANGE_SELECT = 1, 102.4 volts */ + + info->m[PSC_POWER] = rsense; + } + if (vrange_nval != vrange_oval) { + /* Set MFR1 CONFIG register bit 1 VRANGE_SELECT */ + ret = i2c_smbus_write_word_data(client, LTC4286_MFR_CONFIG1, + vrange_nval); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "Failed to set vrange\n"); + } + + info->m[PSC_CURRENT_OUT] = 1024 * rsense; + + return pmbus_do_probe(client, info); +} + +static const struct of_device_id ltc4286_of_match[] = { + { .compatible = "lltc,ltc4286" }, + { .compatible = "lltc,ltc4287" }, + {} +}; + +static struct i2c_driver ltc4286_driver = { + .driver = { + .name = "ltc4286", + .of_match_table = ltc4286_of_match, + }, + .probe = ltc4286_probe, + .id_table = ltc4286_id, +}; + +module_i2c_driver(ltc4286_driver); + +MODULE_AUTHOR("Delphine CC Chiu "); +MODULE_DESCRIPTION("PMBUS driver for LTC4286 and compatibles"); +MODULE_LICENSE("GPL");