pmbus: Add driver for Maxim MAX31785 Intelligent Fan Controller (4d420a6a) · Commits · 戴 / test

Documentation/hwmon/max31785

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		Kernel driver max31785
		======================

		Supported chips:
		* Maxim MAX31785, MAX31785A
		Prefix: 'max31785' or 'max31785a'
		Addresses scanned: -
		Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf

		Author: Andrew Jeffery <andrew@aj.id.au>

		Description
		-----------

		The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan
		management with temperature and remote voltage sensing. Various fan control
		features are provided, including PWM frequency control, temperature hysteresis,
		dual tachometer measurements, and fan health monitoring.

		For dual rotor fan configuration, the MAX31785 exposes the slowest rotor of the
		two in the fan[1-4]_input attributes.

		Usage Notes
		-----------

		This driver does not probe for PMBus devices. You will have to instantiate
		devices explicitly.

		Sysfs attributes
		----------------

		fan[1-4]_alarm Fan alarm.
		fan[1-4]_fault Fan fault.
		fan[1-4]_input Fan RPM.

		in[1-6]_crit Critical maximum output voltage
		in[1-6]_crit_alarm Output voltage critical high alarm
		in[1-6]_input Measured output voltage
		in[1-6]_label "vout[18-23]"
		in[1-6]_lcrit Critical minimum output voltage
		in[1-6]_lcrit_alarm Output voltage critical low alarm
		in[1-6]_max Maximum output voltage
		in[1-6]_max_alarm Output voltage high alarm
		in[1-6]_min Minimum output voltage
		in[1-6]_min_alarm Output voltage low alarm

		temp[1-11]_crit Critical high temperature
		temp[1-11]_crit_alarm Chip temperature critical high alarm
		temp[1-11]_input Measured temperature
		temp[1-11]_max Maximum temperature
		temp[1-11]_max_alarm Chip temperature high alarm

drivers/hwmon/pmbus/Kconfig

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		@@ -114,6 +114,16 @@ config SENSORS_MAX20751
		This driver can also be built as a module. If so, the module will
		be called max20751.

		config SENSORS_MAX31785
		tristate "Maxim MAX31785 and compatibles"
		default n
		help
		If you say yes here you get hardware monitoring support for Maxim
		MAX31785.

		This driver can also be built as a module. If so, the module will
		be called max31785.

		config SENSORS_MAX34440
		tristate "Maxim MAX34440 and compatibles"
		default n

drivers/hwmon/pmbus/Makefile

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		@@ -12,6 +12,7 @@ obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
		obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
		obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
		obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
		obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
		obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
		obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
		obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o

drivers/hwmon/pmbus/max31785.c

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		/*
		* Copyright (C) 2017 IBM Corp.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/err.h>
		#include <linux/i2c.h>
		#include "pmbus.h"

		enum max31785_regs {
		MFR_REVISION = 0x9b,
		};

		#define MAX31785_NR_PAGES 23

		#define MAX31785_FAN_FUNCS \
		(PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12)

		#define MAX31785_TEMP_FUNCS \
		(PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP)

		#define MAX31785_VOUT_FUNCS \
		(PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT)

		static const struct pmbus_driver_info max31785_info = {
		.pages = MAX31785_NR_PAGES,

		/* RPM */
		.format[PSC_FAN] = direct,
		.m[PSC_FAN] = 1,
		.b[PSC_FAN] = 0,
		.R[PSC_FAN] = 0,
		.func[0] = MAX31785_FAN_FUNCS,
		.func[1] = MAX31785_FAN_FUNCS,
		.func[2] = MAX31785_FAN_FUNCS,
		.func[3] = MAX31785_FAN_FUNCS,
		.func[4] = MAX31785_FAN_FUNCS,
		.func[5] = MAX31785_FAN_FUNCS,

		.format[PSC_TEMPERATURE] = direct,
		.m[PSC_TEMPERATURE] = 1,
		.b[PSC_TEMPERATURE] = 0,
		.R[PSC_TEMPERATURE] = 2,
		.func[6] = MAX31785_TEMP_FUNCS,
		.func[7] = MAX31785_TEMP_FUNCS,
		.func[8] = MAX31785_TEMP_FUNCS,
		.func[9] = MAX31785_TEMP_FUNCS,
		.func[10] = MAX31785_TEMP_FUNCS,
		.func[11] = MAX31785_TEMP_FUNCS,
		.func[12] = MAX31785_TEMP_FUNCS,
		.func[13] = MAX31785_TEMP_FUNCS,
		.func[14] = MAX31785_TEMP_FUNCS,
		.func[15] = MAX31785_TEMP_FUNCS,
		.func[16] = MAX31785_TEMP_FUNCS,

		.format[PSC_VOLTAGE_OUT] = direct,
		.m[PSC_VOLTAGE_OUT] = 1,
		.b[PSC_VOLTAGE_OUT] = 0,
		.R[PSC_VOLTAGE_OUT] = 0,
		.func[17] = MAX31785_VOUT_FUNCS,
		.func[18] = MAX31785_VOUT_FUNCS,
		.func[19] = MAX31785_VOUT_FUNCS,
		.func[20] = MAX31785_VOUT_FUNCS,
		.func[21] = MAX31785_VOUT_FUNCS,
		.func[22] = MAX31785_VOUT_FUNCS,
		};

		static int max31785_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct device *dev = &client->dev;
		struct pmbus_driver_info *info;
		s64 ret;

		info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
		if (!info)
		return -ENOMEM;

		*info = max31785_info;

		ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 255);
		if (ret < 0)
		return ret;

		return pmbus_do_probe(client, id, info);
		}

		static const struct i2c_device_id max31785_id[] = {
		{ "max31785", 0 },
		{ "max31785a", 0 },
		{ },
		};

		MODULE_DEVICE_TABLE(i2c, max31785_id);

		static struct i2c_driver max31785_driver = {
		.driver = {
		.name = "max31785",
		},
		.probe = max31785_probe,
		.remove = pmbus_do_remove,
		.id_table = max31785_id,
		};

		module_i2c_driver(max31785_driver);

		MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
		MODULE_DESCRIPTION("PMBus driver for the Maxim MAX31785");
		MODULE_LICENSE("GPL");

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