hwmon: pmbus: add support for STEF48H28

Add support for STEF48H28 hot-swap controller.

Signed-off-by: Charles Hsu <hsu.yungteng@gmail.com>
Link: https://lore.kernel.org/r/20260126063712.1049025-2-hsu.yungteng@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 85 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index d0aa460abdc9..ff01d8155019 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -585,6 +585,15 @@ config SENSORS_Q54SJ108A2
 	  This driver can also be built as a module. If so, the module will
 	  be called q54sj108a2.
 
+config SENSORS_STEF48H28
+	tristate "ST STEF48H28"
+	help
+	  If you say yes here you get hardware monitoring support for ST
+	  STEF48H28.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called stef48h28.
+
 config SENSORS_STPDDC60
 	tristate "ST STPDDC60"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 75ec4956ca8d..85130fd32b7e 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_SENSORS_PLI1209BC)	+= pli1209bc.o
 obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
 obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
 obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
+obj-$(CONFIG_SENSORS_STEF48H28)	+= stef48h28.o
 obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
 obj-$(CONFIG_SENSORS_TDA38640)	+= tda38640.o
 obj-$(CONFIG_SENSORS_TPS25990)	+= tps25990.o
diff --git a/drivers/hwmon/pmbus/stef48h28.c b/drivers/hwmon/pmbus/stef48h28.c
new file mode 100644
index 000000000000..4bde2215697c
--- /dev/null
+++ b/drivers/hwmon/pmbus/stef48h28.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for STMicroelectronics digital controller stef48h28
+ */
+
+#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 stef48h28_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_IN] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_POWER] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.m[PSC_VOLTAGE_IN] = 50,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = 0,
+	.m[PSC_VOLTAGE_OUT] = 50,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = 0,
+	.m[PSC_CURRENT_IN] = 100,
+	.b[PSC_CURRENT_IN] = 0,
+	.R[PSC_CURRENT_IN] = 0,
+	.m[PSC_CURRENT_OUT] = 100,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = 0,
+	.m[PSC_POWER] = 9765,
+	.b[PSC_POWER] = 0,
+	.R[PSC_POWER] = -3,
+	.m[PSC_TEMPERATURE] = 25,
+	.b[PSC_TEMPERATURE] = 500,
+	.R[PSC_TEMPERATURE] = 0,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+		| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
+		| PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+		| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT
+};
+
+static int stef48h28_probe(struct i2c_client *client)
+{
+	return pmbus_do_probe(client, &stef48h28_info);
+}
+
+static const struct i2c_device_id stef48h28_id[] = {
+	{"stef48h28"},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, stef48h28_id);
+
+static const struct of_device_id __maybe_unused stef48h28_of_match[] = {
+	{.compatible = "st,stef48h28"},
+	{}
+};
+
+static struct i2c_driver stef48h28_driver = {
+	.driver = {
+			.name = "stef48h28",
+			.of_match_table = of_match_ptr(stef48h28_of_match),
+			},
+	.probe = stef48h28_probe,
+	.id_table = stef48h28_id,
+};
+
+module_i2c_driver(stef48h28_driver);
+
+MODULE_AUTHOR("Charles Hsu <hsu.yungteng@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for ST stef48h28");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");