hwmon: (pmbus/max17616) add driver for max17616

Add support for MAX17616/MAX17616A current-limiter with
overvoltage/surge, undervoltage, reverse polarity, loss of ground
protection with PMBus interface. The PMBus interface allows monitoring
of input/output voltages, output current and temperature.

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
Link: https://lore.kernel.org/r/20250930-upstream-max17616-v1-2-1525a85f126c@analog.com
[groeck: Fixed htmldocs 'WARNING: Title underline too short'
 as reported by Kriish Sharma <kriish.sharma2006@gmail.com>]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/index.rst

@@ -151,6 +151,7 @@ Hardware Monitoring Kernel Drivers
    max1619
    max16601
    max1668
+   max17616
    max197
    max20730
    max20751

Documentation/hwmon/max17616.rst

@@ -0,0 +1,62 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver max17616
+======================
+
+Supported chips:
+
+  * Analog Devices MAX17616/MAX17616A
+
+    Prefix: 'max17616'
+
+    Addresses scanned: -
+
+    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max17616-max17616a.pdf
+
+Author:
+
+  - Kim Seer Paller <kimseer.paller@analog.com>
+
+
+Description
+-----------
+
+This driver supports hardware monitoring for Analog Devices MAX17616/MAX17616A
+Current-Limiter with OV/Surge, UV, Reverse Polarity, Loss of Ground Protection
+with PMBus Interface.
+
+The MAX17616/MAX17616A is a 3V to 80V, 7A current-limiter with overvoltage,
+surge, undervoltage, reverse polarity, and loss of ground protection. Through
+the PMBus interface, the device can monitor input/output voltages, output current
+and temperature.
+
+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.
+
+Platform data support
+---------------------
+
+The driver supports standard PMBus driver platform data.
+
+Sysfs entries
+-------------
+
+================= ========================================
+in1_label         "vin"
+in1_input         Measured input voltage
+in1_alarm	  Input voltage alarm
+in2_label	  "vout1"
+in2_input	  Measured output voltage
+curr1_label	  "iout1"
+curr1_input	  Measured output current.
+curr1_alarm	  Output current alarm
+temp1_input       Measured temperature
+temp1_alarm       Chip temperature alarm
+================= ========================================

MAINTAINERS

@@ -15171,6 +15171,8 @@ L:	linux-hwmon@vger.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max17616.yaml
+F:	Documentation/hwmon/max17616.rst
+F:	drivers/hwmon/pmbus/max17616.c
 
 MAX2175 SDR TUNER DRIVER
 M:	Ramesh Shanmugasundaram <rashanmu@gmail.com>

drivers/hwmon/pmbus/Kconfig

@@ -320,6 +320,15 @@ config SENSORS_MAX16601
 	  This driver can also be built as a module. If so, the module will
 	  be called max16601.
 
+config SENSORS_MAX17616
+	tristate "Analog Devices MAX17616/MAX17616A"
+	help
+	  If you say yes here you get hardware monitoring support for Analog
+	  Devices MAX17616/MAX17616A.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max17616.
+
 config SENSORS_MAX20730
 	tristate "Maxim MAX20710, MAX20730, MAX20734, MAX20743"
 	help

drivers/hwmon/pmbus/Makefile

@@ -31,6 +31,7 @@ obj-$(CONFIG_SENSORS_LTC4286)	+= ltc4286.o
 obj-$(CONFIG_SENSORS_MAX15301)	+= max15301.o
 obj-$(CONFIG_SENSORS_MAX16064)	+= max16064.o
 obj-$(CONFIG_SENSORS_MAX16601)	+= max16601.o
+obj-$(CONFIG_SENSORS_MAX17616)	+= max17616.o
 obj-$(CONFIG_SENSORS_MAX20730)	+= max20730.o
 obj-$(CONFIG_SENSORS_MAX20751)	+= max20751.o
 obj-$(CONFIG_SENSORS_MAX31785)	+= max31785.o

drivers/hwmon/pmbus/max17616.c

@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware monitoring driver for Analog Devices MAX17616/MAX17616A
+ *
+ * Copyright (C) 2025 Analog Devices, Inc.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+
+#include "pmbus.h"
+
+static struct pmbus_driver_info max17616_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.m[PSC_VOLTAGE_IN] = 512,
+	.b[PSC_VOLTAGE_IN] = -18,
+	.R[PSC_VOLTAGE_IN] = -1,
+
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.m[PSC_VOLTAGE_OUT] = 512,
+	.b[PSC_VOLTAGE_OUT] = -18,
+	.R[PSC_VOLTAGE_OUT] = -1,
+
+	.format[PSC_CURRENT_OUT] = direct,
+	.m[PSC_CURRENT_OUT] = 5845,
+	.b[PSC_CURRENT_OUT] = 80,
+	.R[PSC_CURRENT_OUT] = -1,
+
+	.format[PSC_TEMPERATURE] = direct,
+	.m[PSC_TEMPERATURE] = 71,
+	.b[PSC_TEMPERATURE] = 19653,
+	.R[PSC_TEMPERATURE] = -1,
+
+	.func[0] =  PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+		    PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT |
+		    PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
+		    PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int max17616_probe(struct i2c_client *client)
+{
+	return pmbus_do_probe(client, &max17616_info);
+}
+
+static const struct i2c_device_id max17616_id[] = {
+	{ "max17616" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max17616_id);
+
+static const struct of_device_id max17616_of_match[] = {
+	{ .compatible = "adi,max17616" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max17616_of_match);
+
+static struct i2c_driver max17616_driver = {
+	.driver = {
+		.name = "max17616",
+		.of_match_table = max17616_of_match,
+	},
+	.probe = max17616_probe,
+	.id_table = max17616_id,
+};
+module_i2c_driver(max17616_driver);
+
+MODULE_AUTHOR("Kim Seer Paller <kimseer.paller@analog.com>");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices MAX17616/MAX17616A");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");