---
Documentation/hwmon/hs3001.rst | 37 +++++
MAINTAINERS | 6 +
drivers/hwmon/Kconfig | 10 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/hs3001.c | 259 +++++++++++++++++++++++++++++++++
5 files changed, 313 insertions(+)
create mode 100644 Documentation/hwmon/hs3001.rst
create mode 100644 drivers/hwmon/hs3001.c
diff --git a/Documentation/hwmon/hs3001.rst b/Documentation/hwmon/hs3001.rst
new file mode 100644
index 000000000000..703fb9c45313
--- /dev/null
+++ b/Documentation/hwmon/hs3001.rst
@@ -0,0 +1,37 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver HS3001
+===================
+
+Supported chips:
+
+ * Renesas HS3001, HS3002, HS3003, HS3004
+
+ Prefix: 'hs3001'
+
+ Addresses scanned: -
+
+ Datasheet: https://www.renesas.com/us/en/document/dst/hs300x-datasheet?r=417401
+
+Author:
+
+ - Andre Werner <andre.werner@xxxxxxxxxxxxxxxxxxxxx>
+
+Description
+-----------
+
+This driver implements support for the Renesas HS3001 chips, a humidity
+and temperature family. Temperature is measured in degrees celsius, relative
+humidity is expressed as a percentage. In the sysfs interface, all values are
+scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500.
+
+The device communicates with the I2C protocol. Sensors have the I2C
+address 0x44 by default.
+
+sysfs-Interface
+---------------
+
+===============================================================================
+temp1_input: temperature input
+humidity1_input: humidity input
+===============================================================================
diff --git a/MAINTAINERS b/MAINTAINERS
index dfbb271f1667..4d8603436f9f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9484,6 +9484,12 @@ S: Maintained
W: http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi
F: fs/hpfs/
+HS3001 Hardware Temperature and Humidity Sensor
+M: Andre Werner <andre.werner@xxxxxxxxxxxxxxxxxxxxx>
+L: linux-hwmon@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/hwmon/hs3001.c
+
HSI SUBSYSTEM
M: Sebastian Reichel <sre@xxxxxxxxxx>
S: Maintained
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 307477b8a371..ca6be5a23271 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -734,6 +734,16 @@ config SENSORS_HIH6130
This driver can also be built as a module. If so, the module
will be called hih6130.
+config SENSORS_HS3001
+ tristate "Renesas HS3001 humidity and temperature sensors"
+ depends on I2C
+ help
+ If you say yes here you get support for the Renesas HS3001,
+ to HS3004 humidity and temperature sensors.
+
+ This driver can also be built as a module. If so, the module
+ will be called hs3001.
+
config SENSORS_IBMAEM
tristate "IBM Active Energy Manager temperature/power sensors and control"
select IPMI_SI
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 3f4b0fda0998..cdae4e1fc919 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_SENSORS_GSC) += gsc-hwmon.o
obj-$(CONFIG_SENSORS_GPIO_FAN) += gpio-fan.o
obj-$(CONFIG_SENSORS_GXP_FAN_CTRL) += gxp-fan-ctrl.o
obj-$(CONFIG_SENSORS_HIH6130) += hih6130.o
+obj-$(CONFIG_SENSORS_HS3001) += hs3001.o
obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
obj-$(CONFIG_SENSORS_I5500) += i5500_temp.o
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
diff --git a/drivers/hwmon/hs3001.c b/drivers/hwmon/hs3001.c
new file mode 100644
index 000000000000..af8ad72dccb0
--- /dev/null
+++ b/drivers/hwmon/hs3001.c
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* This is a non-complete driver implementation for the
+ * HS3001 humidity and temperature sensor and compatibles. It does not include
+ * the configuration possibilities, where it needs to be set to 'programming mode'
+ * during power-up.
+ *
+ *
+ * Copyright (C) 2022 SYS TEC electronic AG
+ * Author: Andre Werner <andre.werner@xxxxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+/* Measurement times */
+#define HS3001_WAKEUP_TIME 100 /* us */
+#define HS3001_8BIT_RESOLUTION 550 /* us */
+#define HS3001_10BIT_RESOLUTION 1310 /* us */
+#define HS3001_12BIT_RESOLUTION 4500 /* us */
+#define HS3001_14BIT_RESOLUTION 16900 /* us */
+
+#define HS3001_RESPONSE_LENGTH 4
+
+#define HS3001_FIXPOINT_ARITH 1000
+#define HS3001_MIN_TEMPERATURE (-40 * HS3001_FIXPOINT_ARITH) /* milli degree */
+#define HS3001_MAX_TEMPERATURE (125 * HS3001_FIXPOINT_ARITH) /* milli degree */
+#define HS3001_MIN_HUMIDITY (0 * HS3001_FIXPOINT_ARITH) /* milli percent */
+#define HS3001_MAX_HUMIDITY (100 * HS3001_FIXPOINT_ARITH) /* milli percent */
+
+#define HS3001_MASK_HUMIDITY_0X3FFF 0x3FFF
+#define HS3001_MASK_TEMPERATURE_0XFFFC 0xFFFC
+#define HS3001_MASK_STATUS_0XC0 0xC0
+#define HS3001_STATUS_SHIFT 6
+
+/* Definitions for Status Bits of A/D Data */
+#define HS3001_DATA_VALID 0x00 /* Valid Data */
+#define HS3001_DATA_STALE 0x01 /* Stale Data */
+
+#define LIMIT_MAX 0
+#define LIMIT_MIN 1
+
+enum hs3001_chips {
+ hs3001,
+};
+
+struct hs3001_data {
+ struct i2c_client *client;
+ enum hs3001_chips type;
+ u32 wait_time; /* in us */
+ int temperature; /* in milli degree */
+ u32 humidity; /* in milli % */
+};
+
+static int hs3001_extract_temperature(u16 raw)
+{
+ /* fixpoint arithmetic 1 digit */
+ int temp = ((raw & HS3001_MASK_TEMPERATURE_0XFFFC) >> 2) *
+ HS3001_FIXPOINT_ARITH;
+
+ temp /= (1 << 14) - 1;
+
+ return temp * 165 - 40 * HS3001_FIXPOINT_ARITH;
+}
+
+static u32 hs3001_extract_humidity(u16 raw)
+{
+ int hum = (raw & HS3001_MASK_HUMIDITY_0X3FFF) * HS3001_FIXPOINT_ARITH;
+
+ hum /= (1 << 14) - 1;
+
+ return hum * 100;
+}
+
+static int hs3001_data_fetch_command(struct i2c_client *client,
+ struct hs3001_data *data)
+{
+ int ret;
+ u8 buf[HS3001_RESPONSE_LENGTH];
+ u8 hs3001_status;
+
+ ret = i2c_master_recv(client, buf, HS3001_RESPONSE_LENGTH);
+
+ if (ret != HS3001_RESPONSE_LENGTH) {
+ ret = ret < 0 ? ret : -EIO;
+ dev_dbg(&client->dev,
+ "Error in i2c communication. Error code: %d.\n", ret);
+ return ret;
+ }
+
+ hs3001_status = (buf[0] & HS3001_MASK_STATUS_0XC0) >>
+ HS3001_STATUS_SHIFT;
+ if (hs3001_status == HS3001_DATA_STALE) {
+ dev_dbg(&client->dev, "Sensor busy.\n");
+ return -EBUSY;
+ } else if (hs3001_status != HS3001_DATA_VALID) {
+ dev_dbg(&client->dev, "Data invalid.\n");
+ return -EIO;
+ }
+
+ data->humidity =
+ hs3001_extract_humidity(be16_to_cpup((__be16 *)&buf[0]));
+ data->temperature =
+ hs3001_extract_temperature(be16_to_cpup((__be16 *)&buf[2]));
+
+ return 0;
+}
+
+umode_t hs3001_is_visible(const void *data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ /* Both, humidity and temperature can only be read. */
+ return 0444;
+}
+
+int hs3001_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct hs3001_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int ret;
+ unsigned char buf[1] = { 0x00 };
+
+ ret = i2c_master_send(client, buf, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Sensor needs some time to process measurement depending on
+ * resolution
+ */
+ fsleep(data->wait_time);
+
+ ret = hs3001_data_fetch_command(client, data);
+ if (ret < 0)
+ return ret;
+
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ *val = data->temperature;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case hwmon_humidity:
+ switch (attr) {
+ case hwmon_humidity_input:
+ *val = data->humidity;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct hwmon_channel_info *hs3001_info[] = {
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
+ HWMON_CHANNEL_INFO(humidity, HWMON_H_INPUT),
+ NULL
+};
+
+static const struct hwmon_ops hs3001_hwmon_ops = {
+ .is_visible = hs3001_is_visible,
+ .read = hs3001_read,
+};
+
+static const struct hwmon_chip_info hs3001_chip_info = {
+ .ops = &hs3001_hwmon_ops,
+ .info = hs3001_info,
+};
+
+/* device ID table */
+static const struct i2c_device_id hs3001_ids[] = {
+ { "hs3001", hs3001 },
+ { },
+};
+
+MODULE_DEVICE_TABLE(i2c, hs3001_ids);
+
+static const struct of_device_id hs3001_of_match[] = {
+ {.compatible = "renesas,hs3001",
+ .data = (void *)hs3001
+ },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, hs3001_of_match);
+
+static int hs3001_probe(struct i2c_client *client)
+{
+ struct hs3001_data *data;
+ struct device *hwmon_dev;
+ struct device *dev = &client->dev;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -EOPNOTSUPP;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+
+ if (client->dev.of_node)
+ data->type = (enum hs3001_chips)of_device_get_match_data(&client->dev);
+ else
+ data->type = i2c_match_id(hs3001_ids, client)->driver_data;
+
+ /* Measurement time = wake-up time + measurement time temperature
+ * + measurment time humidity. This is currently static, because
+ * enabling programming mode is not supported, yet.
+ */
+ data->wait_time = (HS3001_WAKEUP_TIME + HS3001_14BIT_RESOLUTION +
+ HS3001_14BIT_RESOLUTION);
+
+ /* Test access to device */
+ ret = i2c_master_send(client, NULL, 0);
+ if (ret)
+ return ret;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev,
+ client->name, data, &hs3001_chip_info, NULL);
+
+ if (IS_ERR(hwmon_dev))
+ return dev_err_probe(dev, PTR_ERR(hwmon_dev),
+ "Unable to register hwmon device.\n");
+
+ return 0;
+}
+
+static struct i2c_driver hs3001_i2c_driver = {
+ .driver = {
+ .name = "hs3001",
+ .of_match_table = hs3001_of_match,
+ },
+ .probe_new = hs3001_probe,
+ .id_table = hs3001_ids,
+};
+
+module_i2c_driver(hs3001_i2c_driver);
+
+MODULE_AUTHOR("Andre Werner <andre.werner@xxxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("HS3001 humidity and temperature sensor base driver");
+MODULE_LICENSE("GPL");
