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Message-ID: <20260106160353.14023-3-vassilisamir@gmail.com>
Date: Tue, 6 Jan 2026 17:03:53 +0100
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org,
linux@...ck-us.net
Cc: devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org,
Vasileios Amoiridis <vasileios.amoiridis@...n.ch>
Subject: [PATCH v1 2/2] hwmon: Add support for HiTRON HAC300S PSU
From: Vasileios Amoiridis <vasileios.amoiridis@...n.ch>
Add Support for HiTRON HAC300S PSU. This is a AC/DC hot-swappable
CompactPCI Serial Dual output active current sharing switching power
supply with a 312W rating.
Signed-off-by: Vasileios Amoiridis <vasileios.amoiridis@...n.ch>
---
Documentation/hwmon/hac300s.rst | 37 ++++++++
MAINTAINERS | 7 ++
drivers/hwmon/pmbus/Kconfig | 9 ++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/hac300s.c | 152 ++++++++++++++++++++++++++++++++
5 files changed, 206 insertions(+)
create mode 100644 Documentation/hwmon/hac300s.rst
create mode 100644 drivers/hwmon/pmbus/hac300s.c
diff --git a/Documentation/hwmon/hac300s.rst b/Documentation/hwmon/hac300s.rst
new file mode 100644
index 000000000000..573269fc81f8
--- /dev/null
+++ b/Documentation/hwmon/hac300s.rst
@@ -0,0 +1,37 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver hac300s
+=====================
+
+Supported chips:
+
+ * HiTRON HAC300S
+
+ Prefix: 'hac300s'
+
+ Datasheet: Publicly available at HiTRON website.
+
+Author:
+
+ - Vasileios Amoiridis <vasileios.amoiridis@...n.ch>
+
+Description
+-----------
+
+This driver implements support for the HiTRON HAC300S PSU. It is a Universal
+AC input harmonic correction AC-DC hot-swappable CompactPCI Serial Dual output
+(with 5V standby) 312 Watts active current sharing switching power supply.
+
+The device has an input of 90-264VAC and 2 nominal output voltaged at 12V and
+5V which they can supplu up to 25A and 2.5A respectively.
+
+Sysfs entries
+-------------
+
+======= ==========================================
+curr1 Output current
+in1 Output voltage
+power1 Output power
+temp1 Ambient temperature inside the module
+temp2 Internal secondary component's temperature
+======= ==========================================
diff --git a/MAINTAINERS b/MAINTAINERS
index a0dd762f5648..feb8ec4d9b17 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11254,6 +11254,13 @@ F: kernel/time/timer_list.c
F: kernel/time/timer_migration.*
F: tools/testing/selftests/timers/
+HITRON HAC300S PSU DRIVER
+M: Vasileios Amoiridis <vasileios.amoiridis@...n.ch>
+L: linux-hwmon@...r.kernel.org
+S: Maintained
+F: Documentation/hwmon/hac300s.rst
+F: drivers/hwmon/pmbus/hac300s.c
+
DELAY, SLEEP, TIMEKEEPING, TIMERS [RUST]
M: Andreas Hindborg <a.hindborg@...nel.org>
R: Boqun Feng <boqun.feng@...il.com>
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index f3fb94cebf1a..4c2cb51dbe3f 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -124,6 +124,15 @@ config SENSORS_FSP_3Y
This driver can also be built as a module. If so, the module will
be called fsp-3y.
+config SENSORS_HAC300S
+ tristate "Hitron HAC300S-D120E PSU"
+ help
+ If you say yes here you get hardware monitoring support for the
+ Hitron HAC300S-D120E Power Supply.
+
+ This driver can also be built as a module. If so, the module will
+ be called hac300s.
+
config SENSORS_IBM_CFFPS
tristate "IBM Common Form Factor Power Supply"
depends on LEDS_CLASS
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 349a89b6d92e..b92309019d35 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
obj-$(CONFIG_SENSORS_BPA_RS600) += bpa-rs600.o
obj-$(CONFIG_SENSORS_DELTA_AHE50DC_FAN) += delta-ahe50dc-fan.o
obj-$(CONFIG_SENSORS_FSP_3Y) += fsp-3y.o
+obj-$(CONFIG_SENSORS_HAC300S) += hac300s.o
obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
obj-$(CONFIG_SENSORS_DPS920AB) += dps920ab.o
obj-$(CONFIG_SENSORS_INA233) += ina233.o
diff --git a/drivers/hwmon/pmbus/hac300s.c b/drivers/hwmon/pmbus/hac300s.c
new file mode 100644
index 000000000000..a1640449e5f5
--- /dev/null
+++ b/drivers/hwmon/pmbus/hac300s.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: 2024 CERN (home.cern)
+/*
+ * Hardware monitoring driver for Hi-Tron HAC300S PSU.
+ *
+ * NOTE: The HAC300S device does not support the PMBUS_VOUT_MODE register.
+ * On top of that, it returns the Voltage output values in Linear11 which is
+ * not adhering to the PMBus specifications. (PMBus Specification Part II,
+ * Section 7.1-7.3). For that reason the PMBUS_VOUT_MODE register is being faked
+ * and returns the exponent value of the READ_VOUT register. The exponent part
+ * of the VOUT_* registers is being cleared in order to return the mantissa to
+ * the pmbus core.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+
+#include "pmbus.h"
+
+#define LINEAR11_EXPONENT_MASK GENMASK(15, 11)
+#define LINEAR11_MANTISSA_MASK GENMASK(10, 0)
+
+#define to_hac300s_data(x) container_of(x, struct hac300s_data, info)
+
+struct hac300s_data {
+ struct pmbus_driver_info info;
+ bool vout_linear11;
+ s8 exponent;
+};
+
+static int hac300s_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct hac300s_data *data = to_hac300s_data(info);
+
+ if (reg == PMBUS_VOUT_MODE && data->vout_linear11)
+ return data->exponent;
+
+ return pmbus_read_byte_data(client, page, reg);
+}
+
+static int hac300s_read_word_data(struct i2c_client *client, int page,
+ int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct hac300s_data *data = to_hac300s_data(info);
+ int rv;
+
+ rv = pmbus_read_word_data(client, page, phase, reg);
+ if (rv < 0)
+ return rv;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_IOUT_AVG:
+ case PMBUS_VIRT_READ_POUT_AVG:
+ case PMBUS_VIRT_READ_TEMP_AVG:
+ return -ENXIO;
+ case PMBUS_VOUT_OV_WARN_LIMIT:
+ case PMBUS_VOUT_UV_WARN_LIMIT:
+ case PMBUS_VOUT_OV_FAULT_LIMIT:
+ case PMBUS_VOUT_UV_FAULT_LIMIT:
+ case PMBUS_MFR_VOUT_MAX:
+ case PMBUS_MFR_VOUT_MIN:
+ case PMBUS_READ_VOUT:
+ if (data->vout_linear11)
+ return FIELD_GET(LINEAR11_MANTISSA_MASK, rv);
+ fallthrough;
+ default:
+ return rv;
+ }
+}
+
+#define HAC300S_SW_FUNC (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | \
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | \
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | \
+ PMBUS_HAVE_POUT | PMBUS_HAVE_STATUS_TEMP)
+
+static struct pmbus_driver_info hac300s_info = {
+ .pages = 1,
+ .func[0] = HAC300S_SW_FUNC,
+ .read_byte_data = hac300s_read_byte_data,
+ .read_word_data = hac300s_read_word_data,
+ .format[PSC_VOLTAGE_OUT] = linear,
+};
+
+static struct pmbus_platform_data hac300s_pdata = {
+ .flags = PMBUS_NO_CAPABILITY,
+};
+
+static int hac300s_probe(struct i2c_client *client)
+{
+ struct hac300s_data *data;
+ int rv;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct hac300s_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA |
+ I2C_FUNC_SMBUS_READ_WORD_DATA))
+ return -ENODEV;
+
+ rv = i2c_smbus_read_byte_data(client, PMBUS_VOUT_MODE);
+ if (rv < 0) {
+ data->vout_linear11 = true;
+ /* LINEAR11 format, use exponent from READ_VOUT register */
+ rv = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT);
+ if (rv < 0)
+ return dev_err_probe(&client->dev, rv, "Failed to read vout_mode\n");
+
+ data->exponent = FIELD_GET(LINEAR11_EXPONENT_MASK, rv);
+ }
+
+ data->info = hac300s_info;
+ client->dev.platform_data = &hac300s_pdata;
+ return pmbus_do_probe(client, &data->info);
+}
+
+static const struct of_device_id hac300s_of_match[] = {
+ { .compatible = "hitron,hac300s" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, hac300s_of_match);
+
+static const struct i2c_device_id hac300s_id[] = {
+ {"hac300s", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, hac300s_id);
+
+static struct i2c_driver hac300s_driver = {
+ .driver = {
+ .name = "hac300s",
+ .of_match_table = hac300s_of_match,
+ },
+ .probe = hac300s_probe,
+ .id_table = hac300s_id,
+
+};
+module_i2c_driver(hac300s_driver);
+
+MODULE_AUTHOR("Vasileios Amoiridis");
+MODULE_DESCRIPTION("PMBus driver for Hi-Tron HAC300S PSU");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.47.3
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