From patchwork Thu Dec 12 21:49:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ninad Palsule X-Patchwork-Id: 13906042 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2B6B1E7717F for ; Thu, 12 Dec 2024 21:53:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=moPxuRvUKwlLFDxDQA0cr7XKF2KHSXt5Qn639JL7DkI=; b=RAwVCElkYYT6W84p8ponF+k2B2 THFinbHRg4cThthltsBblUDWnEu7bXQpoE2icXieH+p/Rb6SBJma1apag4QGLRloGsrZqbYuAymx3 Afnz9lukZo2Uxmxad37CNrmlM3kAnMz4JwUfoAHFLOZypNDedylZIoHyQKoxuukDPhEqNODUVVW7+ P2pcZuWuGuM/4Zz8MD9ztN/a0TS+fv4kVkXuuwBuhZJ55MX+l90j7CH3YZpa/0k4IxuTly64VbIG4 MKSuU8BBigwL5b7TXLy7nCFYDlCYi0S5DTk6CcZteOFs1Nqj7FRGBZW+13Bp+cFMtFTVdTXQ+74EM DPPsT6PA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tLr7P-000000021dN-3YFT; Thu, 12 Dec 2024 21:53:11 +0000 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tLr4I-000000020tx-0ZUf for linux-arm-kernel@lists.infradead.org; Thu, 12 Dec 2024 21:49:59 +0000 Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4BCDUuBa031246; Thu, 12 Dec 2024 21:49:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=moPxuRvUKwlLFDxDQ A0cr7XKF2KHSXt5Qn639JL7DkI=; b=OQICRPiNYc+6Ly6gZHlbOBqw7xaHla6s2 RtNH1CMqZg0LPSPQGMNi4crmDyoJXQUGmUobq4+s2ybQonHG7yszHIy2PGeGvO// Ldt82VQLo6N+oaN5C9RjcOGHHFdlDkgNoxUKk+sDikyl5xN3T1j8ao+J1bTik4SP Ytl6NMxaaSA80auVUIO5Cj9MdjxATxXnGqyPxmtU7I/l7qMB9/ikkMzOIpxlEnrD ZJBgJogQBOYhSBpYNPW+bVnpEY2YzFjZGE8ECnRlWJnjOvbVXz1gUEUeN7rJOwRj a/B6ZGE4dzLH/tU8WponNcdPyN7z0CHYOz6NAn88Qn/T68SqWuIpA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 43g0sbjkgw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 12 Dec 2024 21:49:39 +0000 (GMT) Received: from m0353729.ppops.net (m0353729.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 4BCLncTd008798; Thu, 12 Dec 2024 21:49:38 GMT Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 43g0sbjkgn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 12 Dec 2024 21:49:38 +0000 (GMT) Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 4BCIdRdK007873; Thu, 12 Dec 2024 21:49:36 GMT Received: from smtprelay05.wdc07v.mail.ibm.com ([172.16.1.72]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 43ft11v63j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 12 Dec 2024 21:49:36 +0000 Received: from smtpav06.wdc07v.mail.ibm.com (smtpav06.wdc07v.mail.ibm.com [10.39.53.233]) by smtprelay05.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 4BCLnZcQ30999176 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 12 Dec 2024 21:49:35 GMT Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C074058054; Thu, 12 Dec 2024 21:49:35 +0000 (GMT) Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2ED595803F; Thu, 12 Dec 2024 21:49:34 +0000 (GMT) Received: from gfwa153.aus.stglabs.ibm.com (unknown [9.3.84.127]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 12 Dec 2024 21:49:34 +0000 (GMT) From: Ninad Palsule To: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, eajames@linux.ibm.com, jdelvare@suse.com, linux@roeck-us.net, corbet@lwn.net, joel@jms.id.au, andrew@codeconstruct.com.au, Delphine_CC_Chiu@Wiwynn.com, broonie@kernel.org, peteryin.openbmc@gmail.com, noahwang.wang@outlook.com, naresh.solanki@9elements.com, lukas@wunner.de, jbrunet@baylibre.com, patrick.rudolph@9elements.com, gregkh@linuxfoundation.org, peterz@infradead.org, pbiel7@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-i2c@vger.kernel.org Cc: Ninad Palsule Subject: [PATCH v1 2/4] hwmon: (pmbus/crps) Add Intel CRPS185 power supply Date: Thu, 12 Dec 2024 15:49:01 -0600 Message-ID: <20241212214927.3586509-3-ninad@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241212214927.3586509-1-ninad@linux.ibm.com> References: <20241212214927.3586509-1-ninad@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: TGZJao1Nvmr5IT3954N42LlZCd32IxOh X-Proofpoint-ORIG-GUID: sAKqn42Pv96gjHVSxC_0l2jjVg12plju X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 impostorscore=0 mlxscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 spamscore=0 adultscore=0 phishscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412120156 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241212_134958_279445_9BD4DA25 X-CRM114-Status: GOOD ( 30.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the driver to monitor Intel common redundant power supply (crps185) with hwmon over pmbus. Signed-off-by: Ninad Palsule --- Documentation/hwmon/crps.rst | 95 +++++++++++ MAINTAINERS | 7 + drivers/hwmon/pmbus/Kconfig | 9 ++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/crps.c | 299 +++++++++++++++++++++++++++++++++++ 5 files changed, 411 insertions(+) create mode 100644 Documentation/hwmon/crps.rst create mode 100644 drivers/hwmon/pmbus/crps.c diff --git a/Documentation/hwmon/crps.rst b/Documentation/hwmon/crps.rst new file mode 100644 index 000000000000..81d5dfd68a46 --- /dev/null +++ b/Documentation/hwmon/crps.rst @@ -0,0 +1,95 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver crps +======================== + +Supported chips: + + * Intel CRPS185 + + Prefix: 'crps185' + + Addresses scanned: - + +Authors: + Ninad Palsule + + +Description +----------- + +This driver implements support for Common Redundant Power supply with PMBus +support. + +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. + + +Sysfs entries +------------- + +======================= ====================================================== +curr1_label "iin" +curr1_input Measured input current +curr1_max Maximum input current +curr1_max_alarm Input maximum current high alarm +curr1_crit Critial high input current +curr1_crit_alarm Input critical current high alarm +curr1_rated_max Maximum rated input current + +curr2_label "iout1" +curr2_input Measured output current +curr2_max Maximum output current +curr2_max_alarm Output maximum current high alarm +curr2_crit Critial high output current +curr2_crit_alarm Output critical current high alarm +curr2_rated_max Maximum rated output current + +in1_label "vin" +in1_input Measured input voltage +in1_crit Critical input over voltage +in1_crit_alarm Critical input over voltage alarm +in1_max Maximum input over voltage +in1_max_alarm Maximum input over voltage alarm +in1_rated_min Minimum rated input voltage +in1_rated_max Maximum rated input voltage + +in2_label "vout1" +in2_input Measured input voltage +in2_crit Critical input over voltage +in2_crit_alarm Critical input over voltage alarm +in2_lcrit Critical input under voltage fault +in2_lcrit_alarm Critical input under voltage fault alarm +in2_max Maximum input over voltage +in2_max_alarm Maximum input over voltage alarm +in2_min Minimum input under voltage warning +in2_min_alarm Minimum input under voltage warning alarm +in2_rated_min Minimum rated input voltage +in2_rated_max Maximum rated input voltage + +power1_label "pin" +power1_input Measured input power +power1_alarm Input power high alarm +power1_max Maximum input power +power1_rated_max Maximum rated input power + +temp[1-2]_input Measured temperature +temp[1-2]_crit Critical temperature +temp[1-2]_crit_alarm Critical temperature alarm +temp[1-2]_max Maximum temperature +temp[1-2]_max_alarm Maximum temperature alarm +temp[1-2]_rated_max Maximum rated temperature + +fan1_alarm Fan 1 warning. +fan1_fault Fan 1 fault. +fan1_input Fan 1 speed in RPM. +fan1_target Fan 1 target. +======================= ====================================================== diff --git a/MAINTAINERS b/MAINTAINERS index 637ddd44245f..6b31d545f0f1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6100,6 +6100,13 @@ L: linux-input@vger.kernel.org S: Maintained F: drivers/hid/hid-creative-sb0540.c +CRPS COMMON REDUNDANT PSU DRIVER +M: Ninad Palsule +L: linux-hwmon@vger.kernel.org +S: Maintained +F: Documentation/hwmon/crps.rst +F: drivers/hwmon/pmbus/crps.c + CRYPTO API M: Herbert Xu M: "David S. Miller" diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 22418a05ced0..56c4eb4b846e 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -85,6 +85,15 @@ config SENSORS_BPA_RS600 This driver can also be built as a module. If so, the module will be called bpa-rs600. +config SENSORS_CRPS + tristate "Common Redundant Power Supply" + help + If you say yes here you get hardware monitoring support for the Common + Redundant Power Supply. + + This driver can also be built as a module. If so, the module will + be called crps. + config SENSORS_DELTA_AHE50DC_FAN tristate "Delta AHE-50DC fan control module" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 3d3183f8d2a7..c7eb7739b7f8 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -62,3 +62,4 @@ obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o obj-$(CONFIG_SENSORS_XDPE152) += xdpe152c4.o obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o +obj-$(CONFIG_SENSORS_CRPS) += crps.o diff --git a/drivers/hwmon/pmbus/crps.c b/drivers/hwmon/pmbus/crps.c new file mode 100644 index 000000000000..44d309f81803 --- /dev/null +++ b/drivers/hwmon/pmbus/crps.c @@ -0,0 +1,299 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2024 IBM Corp. + */ + +#include +#include +#include +#include + +#include "pmbus.h" + +/* Intel crps185 specific commands. */ +#define CRPS185_MFR_IOUT_MAX 0xA6 +#define CRPS185_MFR_POUT_MAX 0xA7 + +enum { + CRPS_DEBUGFS_PMBUS_REVISION = 0, + CRPS_DEBUGFS_MAX_POWER_OUT, + CRPS_DEBUGFS_MAX_CURRENT_OUT, + CRPS_DEBUGFS_NUM_ENTRIES +}; + +enum models { crps185 = 1, crps_unknown }; + +struct crps { + enum models version; + struct i2c_client *client; + + int debugfs_entries[CRPS_DEBUGFS_NUM_ENTRIES]; +}; + +#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)]) + +static struct pmbus_platform_data crps_pdata = { + .flags = PMBUS_SKIP_STATUS_CHECK, +}; + +static const struct i2c_device_id crps_id[] = { + { "intel_crps185", crps185 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, crps_id); + +/* + * Convert linear format word to machine format. 11 LSB side bits are two's + * complement integer mantissa and 5 MSB side bits are two's complement + * exponent + */ +static int crps_convert_linear(int rc) +{ + s16 exponent; + s32 mantissa; + s64 val; + + exponent = ((s16)rc) >> 11; + mantissa = ((s16)((rc & 0x7ff) << 5)) >> 5; + + val = mantissa; + if (exponent >= 0) + val <<= exponent; + else + val >>= -exponent; + + return (int)val; +} + +static ssize_t crps_debugfs_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int rc; + int *idxp = file->private_data; + int idx = *idxp; + struct crps *psu = to_psu(idxp, idx); + char data[2 * I2C_SMBUS_BLOCK_MAX] = { 0 }; + + rc = pmbus_lock_interruptible(psu->client); + if (rc) + return rc; + + rc = pmbus_set_page(psu->client, 0, 0xff); + if (rc) + goto unlock; + + switch (idx) { + case CRPS_DEBUGFS_PMBUS_REVISION: + rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION); + if (rc >= 0) { + if (psu->version == crps185) { + if (rc == 0) + rc = sprintf(data, "%s", "1.0"); + else if (rc == 0x11) + rc = sprintf(data, "%s", "1.1"); + else if (rc == 0x22) + rc = sprintf(data, "%s", "1.2"); + else + rc = snprintf(data, 3, "0x%02x", rc); + } else { + rc = snprintf(data, 3, "%02x", rc); + } + } + break; + case CRPS_DEBUGFS_MAX_POWER_OUT: + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX); + if (rc >= 0) { + rc = crps_convert_linear(rc); + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); + } + break; + case CRPS_DEBUGFS_MAX_CURRENT_OUT: + rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_IOUT_MAX); + if (rc >= 0) { + rc = crps_convert_linear(rc); + rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc); + } + break; + default: + rc = -EINVAL; + break; + } + +unlock: + pmbus_unlock(psu->client); + if (rc < 0) + return rc; + + data[rc] = '\n'; + rc += 2; + + return simple_read_from_buffer(buf, count, ppos, data, rc); +} + +static const struct file_operations crps_debugfs_fops = { + .llseek = noop_llseek, + .read = crps_debugfs_read, + .open = simple_open, +}; + +static int crps_read_word_data(struct i2c_client *client, int page, + int phase, int reg) +{ + int rc; + + switch (reg) { + case PMBUS_STATUS_WORD: + rc = pmbus_read_word_data(client, page, phase, reg); + if (rc < 0) + return rc; + break; + case PMBUS_OT_WARN_LIMIT: + rc = pmbus_read_word_data(client, page, phase, + PMBUS_MFR_MAX_TEMP_1); + if (rc < 0) + return rc; + break; + case PMBUS_IOUT_OC_WARN_LIMIT: + rc = pmbus_read_word_data(client, page, phase, + CRPS185_MFR_IOUT_MAX); + if (rc < 0) + return rc; + break; + case PMBUS_POUT_OP_WARN_LIMIT: + rc = pmbus_read_word_data(client, page, phase, + CRPS185_MFR_POUT_MAX); + if (rc < 0) + return rc; + break; + default: + rc = -ENODATA; + break; + } + + return rc; +} + +static struct pmbus_driver_info crps_info[] = { + [crps185] = { + .pages = 1, + /* PSU uses default linear data format. */ + .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN | + PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | + PMBUS_HAVE_STATUS_TEMP | + PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12, + .read_word_data = crps_read_word_data, + }, +}; + +#define to_psu(x, y) container_of((x), struct crps, debugfs_entries[(y)]) + +static void crps_init_debugfs(struct crps *psu) +{ + struct i2c_client *client = psu->client; + struct dentry *debugfs; + int i; + + /* Don't fail the probe if we can't create debugfs */ + debugfs = pmbus_get_debugfs_dir(client); + if (!debugfs) + return; + + for (i = 0; i < CRPS_DEBUGFS_NUM_ENTRIES; ++i) + psu->debugfs_entries[i] = i; + + debugfs_create_file("pmbus_revision", 0444, debugfs, + &psu->debugfs_entries[CRPS_DEBUGFS_PMBUS_REVISION], + &crps_debugfs_fops); + debugfs_create_file("max_power_out", 0444, debugfs, + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_POWER_OUT], + &crps_debugfs_fops); + debugfs_create_file("max_current_out", 0444, debugfs, + &psu->debugfs_entries[CRPS_DEBUGFS_MAX_CURRENT_OUT], + &crps_debugfs_fops); +} + +static int crps_probe(struct i2c_client *client) +{ + int rc; + struct device *dev = &client->dev; + enum models vs = crps_unknown; + struct crps *psu; + const void *md = of_device_get_match_data(&client->dev); + const struct i2c_device_id *id = NULL; + char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 }; + + if (md) { + vs = (uintptr_t)md; + } else { + id = i2c_match_id(crps_id, client); + if (id) + vs = (enum models)id->driver_data; + } + + if (!vs || vs >= crps_unknown) { + dev_err(dev, "Version %d not supported\n", vs); + return -EINVAL; + } + + rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); + if (rc < 0) { + dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n"); + return rc; + } + if (strncmp(buf, "03NK260", 7)) { + buf[rc] = '\0'; + dev_err(dev, "Model '%s' not supported\n", buf); + return -ENODEV; + } + + client->dev.platform_data = &crps_pdata; + rc = pmbus_do_probe(client, &crps_info[vs]); + if (rc) { + dev_err(dev, "Failed to probe %d\n", rc); + return rc; + } + + /* + * Don't fail the probe if there isn't enough memory for debugfs. + */ + psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); + if (!psu) { + dev_warn(dev, "Failed to allocate memory. debugfs are not supported.\n"); + return 0; + } + + psu->version = vs; + psu->client = client; + + crps_init_debugfs(psu); + + return 0; +} + +static const struct of_device_id crps_of_match[] = { + { + .compatible = "intel,crps185", + .data = (void *)crps185 + }, + {} +}; +MODULE_DEVICE_TABLE(of, crps_of_match); + +static struct i2c_driver crps_driver = { + .driver = { + .name = "crps", + .of_match_table = crps_of_match, + }, + .probe = crps_probe, + .id_table = crps_id, +}; + +module_i2c_driver(crps_driver); + +MODULE_AUTHOR("Ninad Palsule"); +MODULE_DESCRIPTION("PMBus driver for Common Redundant power supplies"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("PMBUS");