Commit e20a7198 authored by Chris Packham's avatar Chris Packham Committed by Guenter Roeck
Browse files

hwmon: (pmbus) Add driver for Infineon IR36021 



The IR36021 is a dual‐loop digital multi‐phase buck controller.

Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20210301035954.16713-3-chris.packham@alliedtelesis.co.nz


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 9cff4d8b

Documentation/hwmon/index.rst

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@@ -77,6 +77,7 @@ Hardware Monitoring Kernel Drivers 
   intel-m10-bmc-hwmon

   ir35221

   ir38064

   ir36021

   isl68137

   it87

   jc42

Documentation/hwmon/ir36021.rst

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.. SPDX-License-Identifier: GPL-2.0



Kernel driver ir36021

=====================



Supported chips:



  * Infineon IR36021



    Prefix: ir36021

    Addresses scanned: -



    Datasheet: Publicly available at the Infineon website

      https://www.infineon.com/dgdl/ir36021.pdf?fileId=5546d462533600a4015355d0aa2d1775



Authors:

      - Chris Packham <chris.packham@alliedtelesis.co.nz>



Description

-----------



The IR36021 is a dual‐loop digital multi‐phase buck controller designed for

point of load applications.



Usage Notes

-----------



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

devices explicitly.



Sysfs attributes

----------------



======================= ===========================

curr1_label             "iin"

curr1_input             Measured input current

curr1_alarm             Input fault alarm



curr2_label             "iout1"

curr2_input             Measured output current

curr2_alarm             Output over-current alarm



in1_label               "vin"

in1_input               Measured input voltage

in1_alarm               Input under-voltage alarm



in2_label               "vout1"

in2_input               Measured output voltage

in2_alarm               Output over-voltage alarm



power1_label            "pin"

power1_input            Measured input power

power1_alarm            Input under-voltage alarm



power2_label            "pout1"

power2_input            Measured output power



temp1_input             Measured temperature

temp1_alarm             Temperature alarm



temp2_input             Measured other loop temperature

temp2_alarm             Temperature alarm

======================= ===========================

drivers/hwmon/pmbus/Kconfig

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@@ -84,6 +84,15 @@ config SENSORS_IR35221 
	  This driver can also be built as a module. If so, the module will

	  be called ir35221.



config SENSORS_IR36021

	tristate "Infineon IR36021"

	help

	  If you say yes here you get hardware monitoring support for Infineon

	  IR36021.



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

	  be called ir36021.



config SENSORS_IR38064

	tristate "Infineon IR38064"

	help

drivers/hwmon/pmbus/Makefile

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@@ -11,6 +11,7 @@ obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o 
obj-$(CONFIG_SENSORS_IBM_CFFPS)	+= ibm-cffps.o

obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o

obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o

obj-$(CONFIG_SENSORS_IR36021)	+= ir36021.o

obj-$(CONFIG_SENSORS_IR38064)	+= ir38064.o

obj-$(CONFIG_SENSORS_IRPS5401)	+= irps5401.o

obj-$(CONFIG_SENSORS_ISL68137)	+= isl68137.o

drivers/hwmon/pmbus/ir36021.c

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// SPDX-License-Identifier: GPL-2.0+

/*

 * Hardware monitoring driver for Infineon IR36021

 *

 * Copyright (c) 2021 Allied Telesis

 */

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include "pmbus.h"



static struct pmbus_driver_info ir36021_info = {

	.pages = 1,

	.format[PSC_VOLTAGE_IN] = linear,

	.format[PSC_VOLTAGE_OUT] = linear,

	.format[PSC_CURRENT_IN] = linear,

	.format[PSC_CURRENT_OUT] = linear,

	.format[PSC_POWER] = linear,

	.format[PSC_TEMPERATURE] = linear,

	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT

		| PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT

		| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT

		| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2

		| PMBUS_HAVE_STATUS_TEMP,

};



static int ir36021_probe(struct i2c_client *client)

{

	u8 buf[I2C_SMBUS_BLOCK_MAX];

	int ret;



	if (!i2c_check_functionality(client->adapter,

				     I2C_FUNC_SMBUS_READ_BYTE_DATA

				     | I2C_FUNC_SMBUS_READ_WORD_DATA

				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))

		return -ENODEV;



	ret = i2c_smbus_read_i2c_block_data(client, PMBUS_MFR_MODEL, 2, buf);

	if (ret < 0) {

		dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");

		return ret;

	}

	if (ret != 2 || buf[0] != 0x01 || buf[1] != 0x2d) {

		dev_err(&client->dev, "MFR_MODEL unrecognised\n");

		return -ENODEV;

	}



	return pmbus_do_probe(client, &ir36021_info);

}



static const struct i2c_device_id ir36021_id[] = {

	{ "ir36021", 0 },

	{},

};

MODULE_DEVICE_TABLE(i2c, ir36021_id);



static const struct of_device_id __maybe_unused ir36021_of_id[] = {

	{ .compatible = "infineon,ir36021" },

	{},

};

MODULE_DEVICE_TABLE(of, ir36021_of_id);



static struct i2c_driver ir36021_driver = {

	.class = I2C_CLASS_HWMON,

	.driver = {

		.name = "ir36021",

		.of_match_table = of_match_ptr(ir36021_of_id),

	},

	.probe_new = ir36021_probe,

	.id_table = ir36021_id,

};



module_i2c_driver(ir36021_driver);



MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>");

MODULE_DESCRIPTION("PMBus driver for Infineon IR36021");

MODULE_LICENSE("GPL");