Re: [PATCH v3 3/3] hwmon: Driver for Nuvoton NCT7363Y

From: Guenter Roeck
Date: Sat Feb 03 2024 - 10:07:10 EST

On Fri, Dec 22, 2023 at 09:33:52AM +0800, baneric926@xxxxxxxxx wrote:
> From: Ban Feng <kcfeng0@xxxxxxxxxxx>
>
> NCT7363Y is an I2C based hardware monitoring chip from Nuvoton.
>
> Signed-off-by: Ban Feng <kcfeng0@xxxxxxxxxxx>

Sorry for the late reply. I was waiting for the fan schema to be accepted,
but it looks like that may take more time.

Please fix the various issues reported by checkpatch --strict.
Additional comments inline.

> ---
> Documentation/hwmon/index.rst | 1 +
> Documentation/hwmon/nct7363.rst | 33 ++
> MAINTAINERS | 2 +
> drivers/hwmon/Kconfig | 11 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/nct7363.c | 515 ++++++++++++++++++++++++++++++++
> 6 files changed, 563 insertions(+)
> create mode 100644 Documentation/hwmon/nct7363.rst
> create mode 100644 drivers/hwmon/nct7363.c
>
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 72f4e6065bae..178d3cae95de 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -161,6 +161,7 @@ Hardware Monitoring Kernel Drivers
> mp5023
> nct6683
> nct6775
> + nct7363
> nct7802
> nct7904
> npcm750-pwm-fan
> diff --git a/Documentation/hwmon/nct7363.rst b/Documentation/hwmon/nct7363.rst
> new file mode 100644
> index 000000000000..89699c95aa4b
> --- /dev/null
> +++ b/Documentation/hwmon/nct7363.rst
> @@ -0,0 +1,33 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +Kernel driver nct7363
> +=====================
> +
> +Supported chip:
> +
> + * Nuvoton NCT7363Y
> +
> + Prefix: nct7363
> +
> + Addresses: I2C 0x20, 0x21, 0x22, 0x23
> +
> +Author: Ban Feng <kcfeng0@xxxxxxxxxxx>
> +
> +
> +Description
> +-----------
> +
> +The NCT7363Y is a Fan controller which provides up to 16 independent
> +FAN input monitors, and up to 16 independent PWM output with SMBus interface.
> +
> +
> +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.
> +======================= =======================================================
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 53cfcc629aa1..e39c4fc01a3b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14842,6 +14842,8 @@ M: Ban Feng <kcfeng0@xxxxxxxxxxx>
> L: linux-hwmon@xxxxxxxxxxxxxxx
> S: Maintained
> F: Documentation/devicetree/bindings/hwmon/nuvoton,nct7363.yaml
> +F: Documentation/hwmon/nct7363.rst
> +F: drivers/hwmon/nct7363.c
>
> NETDEVSIM
> M: Jakub Kicinski <kuba@xxxxxxxxxx>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index cf27523eed5a..a0229851fc64 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1605,6 +1605,17 @@ config SENSORS_NCT6775_I2C
> This driver can also be built as a module. If so, the module
> will be called nct6775-i2c.
>
> +config SENSORS_NCT7363
> + tristate "Nuvoton NCT7363Y"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + If you say yes here you get support for the Nuvoton NCT7363Y,
> + hardware monitoring chip.
> +
> + This driver can also be built as a module. If so, the module
> + will be called nct7363.
> +
> config SENSORS_NCT7802
> tristate "Nuvoton NCT7802Y"
> depends on I2C
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index e84bd9685b5c..dd794aa06209 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -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_NCT7363) += nct7363.o
> obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
> obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
> obj-$(CONFIG_SENSORS_NPCM7XX) += npcm750-pwm-fan.o
> diff --git a/drivers/hwmon/nct7363.c b/drivers/hwmon/nct7363.c
> new file mode 100644
> index 000000000000..1bf6e83afd7f
> --- /dev/null
> +++ b/drivers/hwmon/nct7363.c
> @@ -0,0 +1,515 @@
> +// 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/regmap.h>
> +#include <linux/slab.h>
> +
> +#define NCT7363_REG_GPIO_0_3 0x20
> +#define NCT7363_REG_GPIO_4_7 0x21
> +#define NCT7363_REG_GPIO_10_13 0x22
> +#define NCT7363_REG_GPIO_14_17 0x23
> +#define NCT7363_REG_PWMEN_0_7 0x38
> +#define NCT7363_REG_PWMEN_8_15 0x39
> +#define NCT7363_REG_FANINEN_0_7 0x41
> +#define NCT7363_REG_FANINEN_8_15 0x42
> +#define NCT7363_REG_FANINx_HVAL(x) (0x48 + ((x) * 2))
> +#define NCT7363_REG_FANINx_LVAL(x) (0x49 + ((x) * 2))
> +#define NCT7363_REG_FSCPxDUTY(x) (0x90 + ((x) * 2))
> +#define NCT7363_REG_VENDOR_ID 0xFD
> +#define NCT7363_REG_CHIP_ID 0xFE
> +#define NCT7363_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))

(x). checkpatch -strict does report this.

> +#define BIT_CHECK(x) (BIT(0) << x)

This is identical to BIT(x) so I really don't get the point.

> +
> +#define NCT7363_FANINx_LVAL_MASK GENMASK(4, 0)

No CamelCase defines or variables, please.

> +#define NCT7363_FANIN_MASK GENMASK(12, 0)
> +
> +#define NCT7363_PWM_COUNT 16
> +#define NCT7363_FANIN_COUNT 16
> +
> +#define REFRESH_INTERVAL (2 * HZ)
> +
> +static inline unsigned long FAN_FROM_REG(u16 val)
> +{
> + if ((val >= NCT7363_FANIN_MASK) || (val == 0))

Unnecessary () as reported by checkpatch.

Too bad the datasheet isn't public. It would be useful to know what
it means if the upper bits are set. Unconditionally reporting a fan
speed of 0 if any of the bits are set seems excessive unless there
is a good reason for it. If those bits indicate fan faults,
it might make sense to implement respective attributes.

[ Why do you keep this chip and NCT7362Y so secretive ? ]

> + return 0;
> +
> + return (1350000UL / val);
> +}
> +
> +static const unsigned short normal_i2c[] = {
> + 0x20, 0x21, 0x22, 0x23, I2C_CLIENT_END
> +};
> +
> +enum chips { nct7363 };

Unnecessary. If there are plans for this driver to support more chips
in the future, the enum can be added at that time. Yes, I can see in
Nuvoton's 2024 product selection document that there is a NCT7362Y
with the same number of fan and pwm channels, but that doesn't help
if the chips are kept under wrap.

Searching for the chips on the internet, I am reminded of
https://lore.kernel.org/lkml/20230607101827.8544-4-zev@xxxxxxxxxxxxxxxxx/T/
which introduces a quite similar driver with more functionality for NCT7362Y.
That submission even mentions a NCT7360 with 8 channels. Quite frankly
I am inclined to reject both drivers (not that I ever got an update for
the NCT7362Y driver, but anyway) until I get a better understanding
of the similarities and differences between NCT7362Y and NCT7363Y.
Please consider sending me datasheets for those chips.

> +
> +static const struct i2c_device_id nct7363_id[] = {
> + { "nct7363", nct7363 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, nct7363_id);
> +
> +static const struct of_device_id nct7363_of_match[] = {
> + { .compatible = "nuvoton,nct7363", .data = (void *)nct7363 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, nct7363_of_match);
> +
> +struct nct7363_data {
> + struct regmap *regmap;
> + struct mutex update_lock;
> + bool valid;
> + unsigned long last_updated; /* In jiffies */
> +
> + u16 fanin_mask;
> + u16 fan[NCT7363_FANIN_COUNT];
> + u16 pwm_mask;
> + u8 pwm[NCT7363_PWM_COUNT];
> +};
> +
> +static struct nct7363_data *nct7363_update_device(struct device *dev)

Personally I recommend to drop all local caching and just read values
through regmap as requested.

> +{
> + struct nct7363_data *data = dev_get_drvdata(dev);
> + unsigned int hi, lo, regval;
> + int i, ret = 0;
> +
> + 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->fanin_mask & BIT_CHECK(i)))
> + continue;
> +
> + /*
> + * High-byte register should be read first to latch
> + * synchronous low-byte value
> + */
> + ret = regmap_read(data->regmap,
> + NCT7363_REG_FANINx_HVAL(i), &hi);
> + if (ret)
> + goto error;
> +
> + ret = regmap_read(data->regmap,
> + NCT7363_REG_FANINx_LVAL(i), &lo);
> + if (ret)
> + goto error;
> +
> + data->fan[i] = (hi << 5) | (lo & NCT7363_FANINx_LVAL_MASK);
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
> + if (!(data->pwm_mask & BIT_CHECK(i)))
> + continue;
> +
> + ret = regmap_read(data->regmap,
> + NCT7363_REG_FSCPxDUTY(i), &regval);
> + if (ret)
> + goto error;
> +
> + data->pwm[i] = regval;
> + }
> +
> + data->last_updated = jiffies;
> + data->valid = true;
> +
> +error:
> + if (ret)
> + data = ERR_PTR(ret);
> +
> +no_sensor_update:
> + mutex_unlock(&data->update_lock);
> +
> + return data;
> +}
> +
> +static int nct7363_read_fan(struct device *dev, u32 attr, int channel,
> + long *val)
> +{
> + struct nct7363_data *data = nct7363_update_device(dev);
> + u16 cnt, rpm;
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> + switch (attr) {
> + case hwmon_fan_input:
> + cnt = data->fan[channel] & NCT7363_FANIN_MASK;
> + rpm = FAN_FROM_REG(cnt);
> + *val = (long)rpm;
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static umode_t nct7363_fan_is_visible(const void *_data, u32 attr, int channel)
> +{
> + const struct nct7363_data *data = _data;
> +
> + switch (attr) {
> + case hwmon_fan_input:
> + if (data->fanin_mask & BIT_CHECK(channel))
> + return 0444;
> + break;
> + default:
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int nct7363_read_pwm(struct device *dev, u32 attr, int channel,
> + long *val)
> +{
> + struct nct7363_data *data = nct7363_update_device(dev);
> + u16 ret;
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> + switch (attr) {
> + case hwmon_pwm_input:
> + ret = data->pwm[channel];
> + *val = (long)ret;
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int nct7363_write_pwm(struct device *dev, u32 attr, int channel,
> + long val)
> +{
> + struct nct7363_data *data = nct7363_update_device(dev);
> + int ret;
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> + switch (attr) {
> + case hwmon_pwm_input:
> + if (val < 0 || val > 255)
> + return -EINVAL;
> + mutex_lock(&data->update_lock);
> + ret = regmap_write(data->regmap,
> + NCT7363_REG_FSCPxDUTY(channel), val);
> + if (ret == 0)
> + data->pwm[channel] = val;
> + mutex_unlock(&data->update_lock);
> + return ret;
> +
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static umode_t nct7363_pwm_is_visible(const void *_data, u32 attr, int channel)
> +{
> + const struct nct7363_data *data = _data;
> +
> + switch (attr) {
> + case hwmon_pwm_input:
> + if (data->pwm_mask & BIT_CHECK(channel))
> + return 0644;
> + break;
> + default:
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int nct7363_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + switch (type) {
> + case hwmon_fan:
> + return nct7363_read_fan(dev, attr, channel, val);
> + case hwmon_pwm:
> + return nct7363_read_pwm(dev, attr, channel, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int nct7363_write(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long val)
> +{
> + switch (type) {
> + case hwmon_pwm:
> + return nct7363_write_pwm(dev, attr, channel, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static umode_t nct7363_is_visible(const void *data,
> + enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + switch (type) {
> + case hwmon_fan:
> + return nct7363_fan_is_visible(data, attr, channel);
> + case hwmon_pwm:
> + return nct7363_pwm_is_visible(data, attr, channel);
> + default:
> + return 0;
> + }
> +}
> +
> +static const struct hwmon_channel_info *nct7363_info[] = {
> + HWMON_CHANNEL_INFO(fan,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT),
> + HWMON_CHANNEL_INFO(pwm,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT),
> + NULL
> +};
> +
> +static const struct hwmon_ops nct7363_hwmon_ops = {
> + .is_visible = nct7363_is_visible,
> + .read = nct7363_read,
> + .write = nct7363_write,
> +};
> +
> +static const struct hwmon_chip_info nct7363_chip_info = {
> + .ops = &nct7363_hwmon_ops,
> + .info = nct7363_info,
> +};
> +
> +/* Return 0 if detection is successful, -ENODEV otherwise */
> +static int nct7363_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, NCT7363_REG_VENDOR_ID);
> + if (vendor != NUVOTON_ID)
> + return -ENODEV;
> +
> + chip = i2c_smbus_read_byte_data(client, NCT7363_REG_CHIP_ID);
> + if (chip != CHIP_ID)
> + return -ENODEV;
> +
> + device = i2c_smbus_read_byte_data(client, NCT7363_REG_DEVICE_ID);
> + if (device != DEVICE_ID)
> + return -ENODEV;
> +
> + strscpy(info->type, "nct7363", I2C_NAME_SIZE);
> +
> + return 0;
> +}

Chip auto-detection is undesirable for new drivers since it increases
boot time. Please consider dropping this if it is not really needed
for some actual use case.

> +
> +static int nct7363_init_chip(struct nct7363_data *data)
> +{
> + u8 i, gpio0_3 = 0, gpio4_7 = 0, gpio10_13 = 0, gpio14_17 = 0;
> + int ret;
> +
> + for (i = 0; i < NCT7363_PWM_COUNT; i++) {
> + if (i < 4) {
> + if (data->pwm_mask & BIT_CHECK(i))
> + gpio0_3 |= PWM_SEL(i);
> + if (data->fanin_mask & BIT_CHECK(i))
> + gpio10_13 |= FANIN_SEL(i);
> + } else if (i < 8) {
> + if (data->pwm_mask & BIT_CHECK(i))
> + gpio4_7 |= PWM_SEL(i);
> + if (data->fanin_mask & BIT_CHECK(i))
> + gpio14_17 |= FANIN_SEL(i);
> + } else if (i < 12) {
> + if (data->pwm_mask & BIT_CHECK(i))
> + gpio10_13 |= PWM_SEL(i);
> + if (data->fanin_mask & BIT_CHECK(i))
> + gpio0_3 |= FANIN_SEL(i);
> + } else {
> + if (data->pwm_mask & BIT_CHECK(i))
> + gpio14_17 |= PWM_SEL(i);
> + if (data->fanin_mask & BIT_CHECK(i))
> + gpio4_7 |= FANIN_SEL(i);
> + }
> + }
> +
> + /* Pin Function Configuration */
> + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_0_3, gpio0_3);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_4_7, gpio4_7);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_10_13, gpio10_13);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_14_17, gpio14_17);
> + if (ret < 0)
> + return ret;
> +
> + /* PWM and FANIN Monitoring Enable */
> + ret = regmap_write(data->regmap, NCT7363_REG_PWMEN_0_7,
> + data->pwm_mask & 0xff);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(data->regmap, NCT7363_REG_PWMEN_8_15,
> + (data->pwm_mask >> 8) & 0xff);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(data->regmap, NCT7363_REG_FANINEN_0_7,
> + data->fanin_mask & 0xff);
> + if (ret < 0)
> + return ret;
> + ret = regmap_write(data->regmap, NCT7363_REG_FANINEN_8_15,
> + (data->fanin_mask >> 8) & 0xff);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int nct7363_present_pwm_fanin(struct device *dev,
> + struct device_node *child,
> + struct nct7363_data *data)
> +{
> + struct of_phandle_args args;
> + int ret, fanin_cnt;
> + u8 *fanin_ch;
> + u8 ch, index;
> +
> + ret = of_parse_phandle_with_args(child, "pwms", "#pwm-cells",
> + 0, &args);
> + if (ret)
> + return ret;
> +
> + data->pwm_mask |= BIT(args.args[0]);
> +
> + fanin_cnt = of_property_count_u8_elems(child, "tach-ch");
> + if (fanin_cnt < 1)
> + return -EINVAL;
> +
> + fanin_ch = devm_kcalloc(dev, fanin_cnt, sizeof(*fanin_ch), GFP_KERNEL);
> + if (!fanin_ch)
> + return -ENOMEM;
> +
> + ret = of_property_read_u8_array(child, "tach-ch", fanin_ch, fanin_cnt);
> + if (ret)
> + return ret;
> +
> + for (ch = 0; ch < fanin_cnt; ch++) {
> + index = fanin_ch[ch];
> + data->fanin_mask |= BIT(index);
> + }
> +
> + return 0;
> +}

I didn't check if this aligns with the fan bindings schema. Unfortunately
the dt maintainer's reviewed-by: tag got lost with
https://patchwork.kernel.org/project/linux-hwmon/patch/20231222013352.3873689-2-kcfeng0@xxxxxxxxxxx/

o we can not really move forward until that is resolved.

> +
> +static const struct regmap_config nct7363_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> +};
> +
> +static int nct7363_probe(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + struct device_node *child;
> + struct nct7363_data *data;
> + struct device *hwmon_dev;
> + int ret;
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + data->regmap = devm_regmap_init_i2c(client, &nct7363_regmap_config);
> + if (IS_ERR(data->regmap))
> + return PTR_ERR(data->regmap);
> +
> + mutex_init(&data->update_lock);
> +
> + for_each_child_of_node(dev->of_node, child) {
> + ret = nct7363_present_pwm_fanin(dev, child, data);
> + if (ret) {
> + of_node_put(child);
> + return ret;
> + }
> + }
> +
> + /* Initialize the chip */
> + ret = nct7363_init_chip(data);
> + if (ret)
> + return ret;
> +
> + hwmon_dev =
> + devm_hwmon_device_register_with_info(dev, client->name, data,
> + &nct7363_chip_info, NULL);
> + return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static struct i2c_driver nct7363_driver = {
> + .class = I2C_CLASS_HWMON,
> + .driver = {
> + .name = "nct7363",
> + .of_match_table = nct7363_of_match,
> + },
> + .probe = nct7363_probe,
> + .id_table = nct7363_id,
> + .detect = nct7363_detect,
> + .address_list = normal_i2c,
> +};
> +
> +module_i2c_driver(nct7363_driver);
> +
> +MODULE_AUTHOR("CW Ho <cwho@xxxxxxxxxxx>");
> +MODULE_AUTHOR("Ban Feng <kcfeng0@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("NCT7363 Hardware Monitoring Driver");
> +MODULE_LICENSE("GPL");