@@ -161,6 +161,7 @@ Hardware Monitoring Kernel Drivers
mp5023
nct6683
nct6775
+ nct736x
nct7802
nct7904
npcm750-pwm-fan
new file mode 100644
@@ -0,0 +1,35 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver nct736x
+=====================
+
+Supported chip:
+
+ * Nuvoton NCT7362Y NCT7363Y
+
+ Prefix: nct736x
+
+ Addresses: I2C 0x20, 0x21, 0x22, 0x23
+
+Author: Ban Feng <kcfeng0@nuvoton.com>
+
+
+Description
+-----------
+
+The NCT736X is a Fan controller which provides up to 16 independent
+FAN input monitors, and up to 16 independent PWM output with SMBus interface.
+Besides, NCT7363Y has a built-in watchdog timer which is used for
+conditionally generating a system reset output (INT#).
+
+
+Sysfs entries
+-------------
+
+Currently, the driver supports the following features:
+
+======================= =======================================================
+fanX_input provide current fan rotation value in RPM
+
+pwmX get or set PWM fan control value.
+======================= =======================================================
@@ -14905,6 +14905,8 @@ M: Ban Feng <kcfeng0@nuvoton.com>
L: linux-hwmon@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/hwmon/nuvoton,nct736x.yaml
+F: Documentation/hwmon/nct736x.rst
+F: drivers/hwmon/nct736x.c
NETDEVSIM
M: Jakub Kicinski <kuba@kernel.org>
@@ -1605,6 +1605,16 @@ config SENSORS_NCT6775_I2C
This driver can also be built as a module. If so, the module
will be called nct6775-i2c.
+config SENSORS_NCT736X
+ tristate "Nuvoton NCT736X"
+ depends on I2C
+ help
+ If you say yes here you get support for the Nuvoton NCT7362Y,
+ NCT7363Y hardware monitoring chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called nct736x.
+
config SENSORS_NCT7802
tristate "Nuvoton NCT7802Y"
depends on I2C
@@ -166,6 +166,7 @@ obj-$(CONFIG_SENSORS_NCT6775_CORE) += nct6775-core.o
nct6775-objs := nct6775-platform.o
obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
obj-$(CONFIG_SENSORS_NCT6775_I2C) += nct6775-i2c.o
+obj-$(CONFIG_SENSORS_NCT736X) += nct736x.o
obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
obj-$(CONFIG_SENSORS_NPCM7XX) += npcm750-pwm-fan.o
new file mode 100644
@@ -0,0 +1,479 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 Nuvoton Technology corporation.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#define NCT736X_REG_GPIO_0_3 0x20
+#define NCT736X_REG_GPIO_4_7 0x21
+#define NCT736X_REG_GPIO_10_13 0x22
+#define NCT736X_REG_GPIO_14_17 0x23
+#define NCT7363_REG_WDT 0x2A
+#define WDT_CFG_MASK GENMASK(3, 2)
+#define WDT_CFG(x) FIELD_PREP(WDT_CFG_MASK, (x))
+#define EN_WDT BIT(7)
+#define NCT736X_REG_PWMEN_0_7 0x38
+#define NCT736X_REG_PWMEN_8_15 0x39
+#define NCT736X_REG_FANINEN_0_7 0x41
+#define NCT736X_REG_FANINEN_8_15 0x42
+#define NCT736X_REG_FANINx_HVAL(x) (0x48 + ((x) * 2))
+#define NCT736X_REG_FANINx_LVAL(x) (0x49 + ((x) * 2))
+#define NCT736X_REG_FSCPxDUTY(x) (0x90 + ((x) * 2))
+#define NCT736X_REG_VENDOR_ID 0xFD
+#define NCT736X_REG_CHIP_ID 0xFE
+#define NCT736X_REG_DEVICE_ID 0xFF
+
+#define NUVOTON_ID 0x49
+#define CHIP_ID 0x19
+#define DEVICE_ID 0x88
+
+#define PWM_SEL(x) (BIT(0) << ((x % 4) * 2))
+#define FANIN_SEL(x) (BIT(1) << ((x % 4) * 2))
+#define BIT_CHECK(x) (BIT(0) << x)
+
+#define NCT736X_FANINx_LVAL_MASK GENMASK(4, 0)
+#define NCT736X_FANIN_MASK GENMASK(12, 0)
+
+#define NCT736X_PWM_COUNT 16
+#define NCT736X_FANIN_COUNT 16
+
+#define REFRESH_INTERVAL (2 * HZ)
+
+static inline unsigned long FAN_FROM_REG(u16 val)
+{
+ if ((val >= NCT736X_FANIN_MASK) || (val == 0))
+ return 0;
+
+ return (1350000UL / val);
+}
+
+static const unsigned short normal_i2c[] = {
+ 0x20, 0x21, 0x22, 0x23, I2C_CLIENT_END
+};
+
+enum chips { nct7362, nct7363 };
+
+struct nct736x_data {
+ struct i2c_client *client;
+ const struct attribute_group *groups[3];
+ struct mutex update_lock;
+ bool valid;
+ unsigned long last_updated; /* In jiffies */
+
+ u16 fan_mask;
+ u16 fan[NCT736X_FANIN_COUNT];
+ u16 pwm_mask;
+ u8 pwm[NCT736X_PWM_COUNT];
+};
+
+/* Read 1-byte register. Returns unsigned reg or -ERRNO on error. */
+static int nct736x_read_reg(struct i2c_client *client, unsigned int reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+ return ret;
+}
+
+/* Write 1-byte register. Returns 0 or -ERRNO on error. */
+static int nct736x_write_reg(struct i2c_client *client,
+ unsigned int reg, u8 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+ return ret;
+}
+
+static struct nct736x_data *nct736x_update_device(struct device *dev)
+{
+ struct nct736x_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ int i;
+
+ mutex_lock(&data->update_lock);
+
+ if (!(time_after(jiffies, data->last_updated + REFRESH_INTERVAL)
+ || !data->valid))
+ goto no_sensor_update;
+
+ for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
+ if (!(data->fan_mask & BIT_CHECK(i)))
+ continue;
+
+ data->fan[i] = ((u16)nct736x_read_reg(client,
+ NCT736X_REG_FANINx_HVAL(i))) << 5;
+ data->fan[i] |= nct736x_read_reg(client,
+ NCT736X_REG_FANINx_LVAL(i)) & NCT736X_FANINx_LVAL_MASK;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
+ if (!(data->pwm_mask & BIT_CHECK(i)))
+ continue;
+
+ data->pwm[i] = nct736x_read_reg(client,
+ NCT736X_REG_FSCPxDUTY(i));
+ }
+
+ data->last_updated = jiffies;
+ data->valid = true;
+
+no_sensor_update:
+ mutex_unlock(&data->update_lock);
+ return data;
+}
+
+static ssize_t
+fan_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+ struct nct736x_data *data = nct736x_update_device(dev);
+ u16 val;
+
+ val = data->fan[sattr->index] & NCT736X_FANIN_MASK;
+
+ return sprintf(buf, "%lu\n", FAN_FROM_REG(val));
+}
+
+static ssize_t
+pwm_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+ struct nct736x_data *data = nct736x_update_device(dev);
+ u16 val;
+
+ val = data->pwm[sattr->index];
+
+ return sprintf(buf, "%u\n", (val));
+}
+
+static ssize_t
+pwm_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+ struct nct736x_data *data = nct736x_update_device(dev);
+ struct i2c_client *client = data->client;
+ unsigned long tmpVal;
+ int err;
+
+ err = kstrtoul(buf, 10, &tmpVal);
+ if (err)
+ return err;
+
+ tmpVal = clamp_val(tmpVal, 0, 255);
+
+ mutex_lock(&data->update_lock);
+ err = nct736x_write_reg(client, NCT736X_REG_FSCPxDUTY(sattr->index),
+ tmpVal);
+ if (err)
+ goto abort;
+
+ data->pwm[sattr->index] = tmpVal;
+
+abort:
+ mutex_unlock(&data->update_lock);
+ return count;
+}
+
+static umode_t nct736x_fan_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nct736x_data *data = dev_get_drvdata(dev);
+
+ if (!(data->fan_mask & BIT_CHECK(index)))
+ return 0;
+
+ return attr->mode;
+}
+
+static umode_t nct736x_pwm_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nct736x_data *data = dev_get_drvdata(dev);
+
+ if (!(data->pwm_mask & BIT_CHECK(index)))
+ return 0;
+
+ return attr->mode;
+}
+
+#define FAN_INPUT 0
+
+static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, FAN_INPUT, 0);
+static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, FAN_INPUT, 1);
+static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, FAN_INPUT, 2);
+static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, FAN_INPUT, 3);
+static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, FAN_INPUT, 4);
+static SENSOR_DEVICE_ATTR_2_RO(fan6_input, fan, FAN_INPUT, 5);
+static SENSOR_DEVICE_ATTR_2_RO(fan7_input, fan, FAN_INPUT, 6);
+static SENSOR_DEVICE_ATTR_2_RO(fan8_input, fan, FAN_INPUT, 7);
+static SENSOR_DEVICE_ATTR_2_RO(fan9_input, fan, FAN_INPUT, 8);
+static SENSOR_DEVICE_ATTR_2_RO(fan10_input, fan, FAN_INPUT, 9);
+static SENSOR_DEVICE_ATTR_2_RO(fan11_input, fan, FAN_INPUT, 10);
+static SENSOR_DEVICE_ATTR_2_RO(fan12_input, fan, FAN_INPUT, 11);
+static SENSOR_DEVICE_ATTR_2_RO(fan13_input, fan, FAN_INPUT, 12);
+static SENSOR_DEVICE_ATTR_2_RO(fan14_input, fan, FAN_INPUT, 13);
+static SENSOR_DEVICE_ATTR_2_RO(fan15_input, fan, FAN_INPUT, 14);
+static SENSOR_DEVICE_ATTR_2_RO(fan16_input, fan, FAN_INPUT, 15);
+
+static struct attribute *nct736x_attributes_fan[] = {
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_fan2_input.dev_attr.attr,
+ &sensor_dev_attr_fan3_input.dev_attr.attr,
+ &sensor_dev_attr_fan4_input.dev_attr.attr,
+ &sensor_dev_attr_fan5_input.dev_attr.attr,
+ &sensor_dev_attr_fan6_input.dev_attr.attr,
+ &sensor_dev_attr_fan7_input.dev_attr.attr,
+ &sensor_dev_attr_fan8_input.dev_attr.attr,
+ &sensor_dev_attr_fan9_input.dev_attr.attr,
+ &sensor_dev_attr_fan10_input.dev_attr.attr,
+ &sensor_dev_attr_fan11_input.dev_attr.attr,
+ &sensor_dev_attr_fan12_input.dev_attr.attr,
+ &sensor_dev_attr_fan13_input.dev_attr.attr,
+ &sensor_dev_attr_fan14_input.dev_attr.attr,
+ &sensor_dev_attr_fan15_input.dev_attr.attr,
+ &sensor_dev_attr_fan16_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group nct736x_group_fan = {
+ .attrs = nct736x_attributes_fan,
+ .is_visible = nct736x_fan_is_visible,
+};
+
+#define PWM_OUTPUT 0
+
+static SENSOR_DEVICE_ATTR_2_RW(pwm1, pwm, PWM_OUTPUT, 0);
+static SENSOR_DEVICE_ATTR_2_RW(pwm2, pwm, PWM_OUTPUT, 1);
+static SENSOR_DEVICE_ATTR_2_RW(pwm3, pwm, PWM_OUTPUT, 2);
+static SENSOR_DEVICE_ATTR_2_RW(pwm4, pwm, PWM_OUTPUT, 3);
+static SENSOR_DEVICE_ATTR_2_RW(pwm5, pwm, PWM_OUTPUT, 4);
+static SENSOR_DEVICE_ATTR_2_RW(pwm6, pwm, PWM_OUTPUT, 5);
+static SENSOR_DEVICE_ATTR_2_RW(pwm7, pwm, PWM_OUTPUT, 6);
+static SENSOR_DEVICE_ATTR_2_RW(pwm8, pwm, PWM_OUTPUT, 7);
+static SENSOR_DEVICE_ATTR_2_RW(pwm9, pwm, PWM_OUTPUT, 8);
+static SENSOR_DEVICE_ATTR_2_RW(pwm10, pwm, PWM_OUTPUT, 9);
+static SENSOR_DEVICE_ATTR_2_RW(pwm11, pwm, PWM_OUTPUT, 10);
+static SENSOR_DEVICE_ATTR_2_RW(pwm12, pwm, PWM_OUTPUT, 11);
+static SENSOR_DEVICE_ATTR_2_RW(pwm13, pwm, PWM_OUTPUT, 12);
+static SENSOR_DEVICE_ATTR_2_RW(pwm14, pwm, PWM_OUTPUT, 13);
+static SENSOR_DEVICE_ATTR_2_RW(pwm15, pwm, PWM_OUTPUT, 14);
+static SENSOR_DEVICE_ATTR_2_RW(pwm16, pwm, PWM_OUTPUT, 15);
+
+static struct attribute *nct736x_attributes_pwm[] = {
+ &sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_pwm2.dev_attr.attr,
+ &sensor_dev_attr_pwm3.dev_attr.attr,
+ &sensor_dev_attr_pwm4.dev_attr.attr,
+ &sensor_dev_attr_pwm5.dev_attr.attr,
+ &sensor_dev_attr_pwm6.dev_attr.attr,
+ &sensor_dev_attr_pwm7.dev_attr.attr,
+ &sensor_dev_attr_pwm8.dev_attr.attr,
+ &sensor_dev_attr_pwm9.dev_attr.attr,
+ &sensor_dev_attr_pwm10.dev_attr.attr,
+ &sensor_dev_attr_pwm11.dev_attr.attr,
+ &sensor_dev_attr_pwm12.dev_attr.attr,
+ &sensor_dev_attr_pwm13.dev_attr.attr,
+ &sensor_dev_attr_pwm14.dev_attr.attr,
+ &sensor_dev_attr_pwm15.dev_attr.attr,
+ &sensor_dev_attr_pwm16.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group nct736x_group_pwm = {
+ .attrs = nct736x_attributes_pwm,
+ .is_visible = nct736x_pwm_is_visible,
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int nct736x_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ int vendor, chip, device;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ vendor = i2c_smbus_read_byte_data(client, NCT736X_REG_VENDOR_ID);
+ if (vendor != NUVOTON_ID)
+ return -ENODEV;
+
+ chip = i2c_smbus_read_byte_data(client, NCT736X_REG_CHIP_ID);
+ if (chip != CHIP_ID)
+ return -ENODEV;
+
+ device = i2c_smbus_read_byte_data(client, NCT736X_REG_DEVICE_ID);
+ if (device != DEVICE_ID)
+ return -ENODEV;
+
+ strscpy(info->type, "nct736x", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static const struct i2c_device_id nct736x_id[] = {
+ {"nct7362", nct7362},
+ {"nct7363", nct7363},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, nct736x_id);
+
+static int nct736x_init_chip(struct i2c_client *client,
+ u32 pwm_mask, u32 fanin_mask, u32 wdt_cfg)
+{
+ const struct i2c_device_id *id = i2c_match_id(nct736x_id, client);
+ u8 i, gpio0_3, gpio4_7, gpio10_13, gpio14_17;
+ int ret;
+
+ for (i = 0; i < NCT736X_PWM_COUNT; i++) {
+ if (i < 4) {
+ if (pwm_mask & BIT_CHECK(i))
+ gpio0_3 |= PWM_SEL(i);
+ if (fanin_mask & BIT_CHECK(i))
+ gpio10_13 |= FANIN_SEL(i);
+ } else if (i < 8) {
+ if (pwm_mask & BIT_CHECK(i))
+ gpio4_7 |= PWM_SEL(i);
+ if (fanin_mask & BIT_CHECK(i))
+ gpio14_17 |= FANIN_SEL(i);
+ } else if (i < 12) {
+ if (pwm_mask & BIT_CHECK(i))
+ gpio10_13 |= PWM_SEL(i);
+ if (fanin_mask & BIT_CHECK(i))
+ gpio0_3 |= FANIN_SEL(i);
+ } else {
+ if (pwm_mask & BIT_CHECK(i))
+ gpio14_17 |= PWM_SEL(i);
+ if (fanin_mask & BIT_CHECK(i))
+ gpio4_7 |= FANIN_SEL(i);
+ }
+ }
+
+ /* Pin Function Configuration */
+ ret = nct736x_write_reg(client, NCT736X_REG_GPIO_0_3, gpio0_3);
+ if (ret < 0)
+ return ret;
+ ret = nct736x_write_reg(client, NCT736X_REG_GPIO_4_7, gpio4_7);
+ if (ret < 0)
+ return ret;
+ ret = nct736x_write_reg(client, NCT736X_REG_GPIO_10_13, gpio10_13);
+ if (ret < 0)
+ return ret;
+ ret = nct736x_write_reg(client, NCT736X_REG_GPIO_14_17, gpio14_17);
+ if (ret < 0)
+ return ret;
+
+ /* PWM and FANIN Monitoring Enable */
+ ret = nct736x_write_reg(client, NCT736X_REG_PWMEN_0_7,
+ pwm_mask & 0xff);
+ if (ret < 0)
+ return ret;
+ ret = nct736x_write_reg(client,
+ NCT736X_REG_PWMEN_8_15, (pwm_mask >> 8) & 0xff);
+ if (ret < 0)
+ return ret;
+ ret = nct736x_write_reg(client, NCT736X_REG_FANINEN_0_7,
+ fanin_mask & 0xff);
+ if (ret < 0)
+ return ret;
+ ret = nct736x_write_reg(client, NCT736X_REG_FANINEN_8_15,
+ (fanin_mask >> 8) & 0xff);
+ if (ret < 0)
+ return ret;
+
+ /* Watchdog Timer Configuration */
+ if (wdt_cfg != 0xff && id->driver_data == nct7363) {
+ ret = nct736x_write_reg(client, NCT7363_REG_WDT, wdt_cfg);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int nct736x_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct nct736x_data *data;
+ struct device *hwmon_dev;
+ u32 pwm_mask, fanin_mask, val, wdt_cfg;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(struct nct736x_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
+
+ data->client = client;
+
+ if (of_property_read_u32(dev->of_node, "nuvoton,pwm-mask", &pwm_mask))
+ pwm_mask = 0;
+ if (of_property_read_u32(dev->of_node,
+ "nuvoton,fanin-mask", &fanin_mask))
+ fanin_mask = 0;
+ if (of_property_read_u32(dev->of_node, "nuvoton,wdt-timeout", &val))
+ wdt_cfg = 0xff;
+ else
+ wdt_cfg = WDT_CFG(val) | EN_WDT;
+
+ /* Initialize the chip */
+ ret = nct736x_init_chip(client, pwm_mask, fanin_mask, wdt_cfg);
+ if (ret)
+ return ret;
+
+ data->fan_mask = (u16)fanin_mask;
+ data->pwm_mask = (u16)pwm_mask;
+
+ data = nct736x_update_device(dev);
+
+ data->groups[0] = &nct736x_group_fan;
+ data->groups[1] = &nct736x_group_pwm;
+ data->groups[2] = NULL;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev,
+ client->name,
+ data, data->groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id nct736x_of_match[] = {
+ { .compatible = "nuvoton,nct7362" },
+ { .compatible = "nuvoton,nct7363" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, nct736x_of_match);
+
+static struct i2c_driver nct736x_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "nct736x",
+ .of_match_table = nct736x_of_match,
+ },
+ .probe = nct736x_probe,
+ .id_table = nct736x_id,
+ .detect = nct736x_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(nct736x_driver);
+
+MODULE_AUTHOR("CWHo <cwho@nuvoton.com>");
+MODULE_AUTHOR("Ban Feng <kcfeng0@nuvoton.com>");
+MODULE_DESCRIPTION("NCT736X Hardware Monitoring Driver");
+MODULE_LICENSE("GPL");