[PATCH v5 3/4] hwmon: smpro: Add Ampere's Altra smpro-hwmon driver

Quan Nguyen
2021-07-13T23:45:22Z

On 13/07/2021 22:28, Guenter Roeck wrote:
> On 7/12/21 11:00 PM, Quan Nguyen wrote:
>> This commit adds support for Ampere SMpro hwmon driver. This driver
>> supports accessing various CPU sensors provided by the SMpro co-processor
>> including temperature, power, voltages, and current.
>>
>> Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
>
> For my reference:
>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
>
Thanks for the review.
- Quan

>> ---
>> Changes in v5:
>> ?? + Drop ManufacturerID checking when probe as it was checked during
>> ?? smpro-mfd probing [Quan]
>> ?? + Drop the use of register offset [Quan]
>> ?? + Removed the use of compatible string as it is instantiated by
>> ?? smpro-mfd driver [Quan]
>> ?? + Thanks Guenter for the Reviewed-by in last version, but it was
>> ?? not added because there's some changes in this version. Really
>> ?? appreciate if you could help again, thank you.
>>
>> Changes in v4:
>> ?? + Returned regmap_read() error code [Guenter]
>>
>> Changes in v3:
>> ?? + Handled negative temperature value [Guenter]
>> ?? + Returned -ENODEV if Manufacturer ID is wrong [Guenter]
>> ?? + Refactored smpro_read_string() and smpro_temp_read() [Guenter]
>> ?? + Removed smpro_write() function [Guenter]
>> ?? + Added minor refactor changes [Quan]
>>
>> Changes in v2:
>> ?? + Removed "virtual" sensors [Guenter]
>> ?? + Reported SOC_TDP as "Socket TDP" using max attributes [Guenter]
>> ?? + Corrected return error code when host is turn off [Guenter]
>> ?? + Reported MEM HOT Threshold for all DIMMs as temp*_crit [Guenter]
>> ?? + Removed license info as SPDX-License-Identifier existed [Guenter]
>> ?? + Added is_visible() support [Guenter]
>> ?? + Used HWMON_CHANNEL_INFO() macro and LABEL attributes [Guenter]
>> ?? + Made is_valid_id() return boolean [Guenter]
>> ?? + Returned -EPROBE_DEFER when smpro reg inaccessible [Guenter]
>> ?? + Removed unnecessary error message when dev register fail [Guenter]
>> ?? + Removed Socket TDP sensor [Quan]
>> ?? + Included sensor type and channel in labels [Quan]
>> ?? + Refactorized code to fix checkpatch.pl --strict complaint [Quan]
>>
>> ? drivers/hwmon/Kconfig?????? |?? 8 +
>> ? drivers/hwmon/Makefile????? |?? 1 +
>> ? drivers/hwmon/smpro-hwmon.c | 463 ++++++++++++++++++++++++++++++++++++
>> ? 3 files changed, 472 insertions(+)
>> ? create mode 100644 drivers/hwmon/smpro-hwmon.c
>>
>> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
>> index e3675377bc5d..903c5ef79a5a 100644
>> --- a/drivers/hwmon/Kconfig
>> +++ b/drivers/hwmon/Kconfig
>> @@ -67,6 +67,14 @@ config SENSORS_ABITUGURU3
>> ??????? This driver can also be built as a module. If so, the module
>> ??????? will be called abituguru3.
>> +config SENSORS_SMPRO
>> +??? tristate "Ampere's Altra SMpro hardware monitoring driver"
>> +??? depends on MFD_SMPRO
>> +??? help
>> +????? If you say yes here you get support for the thermal, voltage,
>> +????? current and power sensors of Ampere's Altra processor family SoC
>> +????? with SMpro co-processor.
>> +
>> ? config SENSORS_AD7314
>> ????? tristate "Analog Devices AD7314 and compatibles"
>> ????? depends on SPI
>> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
>> index d712c61c1f5e..9de5cd9911b0 100644
>> --- a/drivers/hwmon/Makefile
>> +++ b/drivers/hwmon/Makefile
>> @@ -175,6 +175,7 @@ obj-$(CONFIG_SENSORS_SHT4x)??? += sht4x.o
>> ? obj-$(CONFIG_SENSORS_SHTC1)??? += shtc1.o
>> ? obj-$(CONFIG_SENSORS_SIS5595)??? += sis5595.o
>> ? obj-$(CONFIG_SENSORS_SMM665)??? += smm665.o
>> +obj-$(CONFIG_SENSORS_SMPRO)??? += smpro-hwmon.o
>> ? obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
>> ? obj-$(CONFIG_SENSORS_SMSC47M1)??? += smsc47m1.o
>> ? obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
>> diff --git a/drivers/hwmon/smpro-hwmon.c b/drivers/hwmon/smpro-hwmon.c
>> new file mode 100644
>> index 000000000000..b01ceea33ddd
>> --- /dev/null
>> +++ b/drivers/hwmon/smpro-hwmon.c
>> @@ -0,0 +1,463 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Ampere Computing SoC's SMPro Hardware Monitoring Driver
>> + *
>> + * Copyright (c) 2021, Ampere Computing LLC
>> + */
>> +#include <linux/bitfield.h>
>> +#include <linux/bitops.h>
>> +#include <linux/hwmon.h>
>> +#include <linux/hwmon-sysfs.h>
>> +#include <linux/kernel.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/property.h>
>> +#include <linux/regmap.h>
>> +
>> +/* Logical Power Sensor Registers */
>> +#define SOC_TEMP??????? 0x10
>> +#define SOC_VRD_TEMP??????? 0x11
>> +#define DIMM_VRD_TEMP??????? 0x12
>> +#define CORE_VRD_TEMP??????? 0x13
>> +#define CH0_DIMM_TEMP??????? 0x14
>> +#define CH1_DIMM_TEMP??????? 0x15
>> +#define CH2_DIMM_TEMP??????? 0x16
>> +#define CH3_DIMM_TEMP??????? 0x17
>> +#define CH4_DIMM_TEMP??????? 0x18
>> +#define CH5_DIMM_TEMP??????? 0x19
>> +#define CH6_DIMM_TEMP??????? 0x1A
>> +#define CH7_DIMM_TEMP??????? 0x1B
>> +#define RCA_VRD_TEMP??????? 0x1C
>> +
>> +#define CORE_VRD_PWR??????? 0x20
>> +#define SOC_PWR??????????? 0x21
>> +#define DIMM_VRD1_PWR??????? 0x22
>> +#define DIMM_VRD2_PWR??????? 0x23
>> +#define CORE_VRD_PWR_MW??????? 0x26
>> +#define SOC_PWR_MW??????? 0x27
>> +#define DIMM_VRD1_PWR_MW??? 0x28
>> +#define DIMM_VRD2_PWR_MW??? 0x29
>> +#define RCA_VRD_PWR??????? 0x2A
>> +#define RCA_VRD_PWR_MW??????? 0x2B
>> +
>> +#define MEM_HOT_THRESHOLD??? 0x32
>> +#define SOC_VR_HOT_THRESHOLD??? 0x33
>> +#define CORE_VRD_VOLT??????? 0x34
>> +#define SOC_VRD_VOLT??????? 0x35
>> +#define DIMM_VRD1_VOLT??????? 0x36
>> +#define DIMM_VRD2_VOLT??????? 0x37
>> +#define RCA_VRD_VOLT??????? 0x38
>> +
>> +#define CORE_VRD_CURR??????? 0x39
>> +#define SOC_VRD_CURR??????? 0x3A
>> +#define DIMM_VRD1_CURR??????? 0x3B
>> +#define DIMM_VRD2_CURR??????? 0x3C
>> +#define RCA_VRD_CURR??????? 0x3D
>> +
>> +struct smpro_hwmon {
>> +??? struct regmap *regmap;
>> +};
>> +
>> +struct smpro_sensor {
>> +??? const u8 reg;
>> +??? const u8 reg_ext;
>> +??? const char *label;
>> +};
>> +
>> +static const struct smpro_sensor temperature[] = {
>> +??? {
>> +??????? .reg = SOC_TEMP,
>> +??????? .label = "temp1 SoC"
>> +??? },
>> +??? {
>> +??????? .reg = SOC_VRD_TEMP,
>> +??????? .reg_ext = SOC_VR_HOT_THRESHOLD,
>> +??????? .label = "temp2 SoC VRD"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD_TEMP,
>> +??????? .label = "temp3 DIMM VRD"
>> +??? },
>> +??? {
>> +??????? .reg = CORE_VRD_TEMP,
>> +??????? .label = "temp4 CORE VRD"
>> +??? },
>> +??? {
>> +??????? .reg = CH0_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp5 CH0 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH1_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp6 CH1 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH2_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp7 CH2 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH3_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp8 CH3 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH4_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp9 CH4 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH5_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp10 CH5 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH6_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp11 CH6 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = CH7_DIMM_TEMP,
>> +??????? .reg_ext = MEM_HOT_THRESHOLD,
>> +??????? .label = "temp12 CH7 DIMM"
>> +??? },
>> +??? {
>> +??????? .reg = RCA_VRD_TEMP,
>> +??????? .label = "temp13 RCA VRD"
>> +??? },
>> +};
>> +
>> +static const struct smpro_sensor voltage[] = {
>> +??? {
>> +??????? .reg = CORE_VRD_VOLT,
>> +??????? .label = "vout0 CORE VRD"
>> +??? },
>> +??? {
>> +??????? .reg = SOC_VRD_VOLT,
>> +??????? .label = "vout1 SoC VRD"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD1_VOLT,
>> +??????? .label = "vout2 DIMM VRD1"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD2_VOLT,
>> +??????? .label = "vout3 DIMM VRD2"
>> +??? },
>> +??? {
>> +??????? .reg = RCA_VRD_VOLT,
>> +??????? .label = "vout4 RCA VRD"
>> +??? },
>> +};
>> +
>> +static const struct smpro_sensor curr_sensor[] = {
>> +??? {
>> +??????? .reg = CORE_VRD_CURR,
>> +??????? .label = "iout1 CORE VRD"
>> +??? },
>> +??? {
>> +??????? .reg = SOC_VRD_CURR,
>> +??????? .label = "iout2 SoC VRD"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD1_CURR,
>> +??????? .label = "iout3 DIMM VRD1"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD2_CURR,
>> +??????? .label = "iout4 DIMM VRD2"
>> +??? },
>> +??? {
>> +??????? .reg = RCA_VRD_CURR,
>> +??????? .label = "iout5 RCA VRD"
>> +??? },
>> +};
>> +
>> +static const struct smpro_sensor power[] = {
>> +??? {
>> +??????? .reg = CORE_VRD_PWR,
>> +??????? .reg_ext = CORE_VRD_PWR_MW,
>> +??????? .label = "power1 CORE VRD"
>> +??? },
>> +??? {
>> +??????? .reg = SOC_PWR,
>> +??????? .reg_ext = SOC_PWR_MW,
>> +??????? .label = "power2 SoC"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD1_PWR,
>> +??????? .reg_ext = DIMM_VRD1_PWR_MW,
>> +??????? .label = "power3 DIMM VRD1"
>> +??? },
>> +??? {
>> +??????? .reg = DIMM_VRD2_PWR,
>> +??????? .reg_ext = DIMM_VRD2_PWR_MW,
>> +??????? .label = "power4 DIMM VRD2"
>> +??? },
>> +??? {
>> +??????? .reg = RCA_VRD_PWR,
>> +??????? .reg_ext = RCA_VRD_PWR_MW,
>> +??????? .label = "power5 RCA VRD"
>> +??? },
>> +};
>> +
>> +static int smpro_read_temp(struct device *dev, u32 attr, int channel,
>> long *val)
>> +{
>> +??? struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
>> +??? unsigned int value;
>> +??? int ret;
>> +
>> +??? switch (attr) {
>> +??? case hwmon_temp_input:
>> +??????? ret = regmap_read(hwmon->regmap, temperature[channel].reg,
>> &value);
>> +??????? if (ret)
>> +??????????? return ret;
>> +??????? break;
>> +??? case hwmon_temp_crit:
>> +??????? ret = regmap_read(hwmon->regmap,
>> temperature[channel].reg_ext, &value);
>> +??????? if (ret)
>> +??????????? return ret;
>> +??????? break;
>> +??? default:
>> +??????? return -EOPNOTSUPP;
>> +??? }
>> +
>> +??? *val = sign_extend32(value, 8) * 1000;
>> +??? return 0;
>> +}
>> +
>> +static int smpro_read_in(struct device *dev, u32 attr, int channel,
>> long *val)
>> +{
>> +??? struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
>> +??? unsigned int value;
>> +??? int ret;
>> +
>> +??? switch (attr) {
>> +??? case hwmon_in_input:
>> +??????? ret = regmap_read(hwmon->regmap, voltage[channel].reg, &value);
>> +??????? if (ret < 0)
>> +??????????? return ret;
>> +??????? /* 15-bit value in 1mV */
>> +??????? *val = value & 0x7fff;
>> +??????? return 0;
>> +??? default:
>> +??????? return -EOPNOTSUPP;
>> +??? }
>> +}
>> +
>> +static int smpro_read_curr(struct device *dev, u32 attr, int channel,
>> long *val)
>> +{
>> +??? struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
>> +??? unsigned int value;
>> +??? int ret;
>> +
>> +??? switch (attr) {
>> +??? case hwmon_curr_input:
>> +??????? ret = regmap_read(hwmon->regmap, curr_sensor[channel].reg,
>> &value);
>> +??????? if (ret < 0)
>> +??????????? return ret;
>> +??????? /* Scale reported by the hardware is 1mA */
>> +??????? *val = value & 0x7fff;
>> +??????? return 0;
>> +??? default:
>> +??????? return -EOPNOTSUPP;
>> +??? }
>> +}
>> +
>> +static int smpro_read_power(struct device *dev, u32 attr, int
>> channel, long *val_pwr)
>> +{
>> +??? struct smpro_hwmon *hwmon = dev_get_drvdata(dev);
>> +??? unsigned int val = 0, val_mw = 0;
>> +??? int ret;
>> +
>> +??? switch (attr) {
>> +??? case hwmon_power_input:
>> +??????? ret = regmap_read(hwmon->regmap, power[channel].reg, &val);
>> +??????? if (ret)
>> +??????????? return ret;
>> +
>> +??????? ret = regmap_read(hwmon->regmap, power[channel].reg_ext,
>> &val_mw);
>> +??????? if (ret)
>> +??????????? return ret;
>> +
>> +??????? *val_pwr = val * 1000000 + val_mw * 1000;
>> +??????? return 0;
>> +
>> +??? default:
>> +??????? return -EOPNOTSUPP;
>> +??? }
>> +}
>> +
>> +static int smpro_read(struct device *dev, enum hwmon_sensor_types type,
>> +????????????? u32 attr, int channel, long *val)
>> +{
>> +??? switch (type) {
>> +??? case hwmon_temp:
>> +??????? return smpro_read_temp(dev, attr, channel, val);
>> +??? case hwmon_in:
>> +??????? return smpro_read_in(dev, attr, channel, val);
>> +??? case hwmon_power:
>> +??????? return smpro_read_power(dev, attr, channel, val);
>> +??? case hwmon_curr:
>> +??????? return smpro_read_curr(dev, attr, channel, val);
>> +??? default:
>> +??????? return -EOPNOTSUPP;
>> +??? }
>> +}
>> +
>> +static int smpro_read_string(struct device *dev, enum
>> hwmon_sensor_types type,
>> +???????????????? u32 attr, int channel, const char **str)
>> +{
>> +??? switch (type) {
>> +??? case hwmon_temp:
>> +??????? switch (attr) {
>> +??????? case hwmon_temp_label:
>> +??????????? *str = temperature[channel].label;
>> +??????????? return 0;
>> +??????? default:
>> +??????????? break;
>> +??????? }
>> +??????? break;
>> +
>> +??? case hwmon_in:
>> +??????? switch (attr) {
>> +??????? case hwmon_in_label:
>> +??????????? *str = voltage[channel].label;
>> +??????????? return 0;
>> +??????? default:
>> +??????????? break;
>> +??????? }
>> +??????? break;
>> +
>> +??? case hwmon_curr:
>> +??????? switch (attr) {
>> +??????? case hwmon_curr_label:
>> +??????????? *str = curr_sensor[channel].label;
>> +??????????? return 0;
>> +??????? default:
>> +??????????? break;
>> +??????? }
>> +??????? break;
>> +
>> +??? case hwmon_power:
>> +??????? switch (attr) {
>> +??????? case hwmon_power_label:
>> +??????????? *str = power[channel].label;
>> +??????????? return 0;
>> +??????? default:
>> +??????????? break;
>> +??????? }
>> +??????? break;
>> +??? default:
>> +??????? break;
>> +??? }
>> +
>> +??? return -EOPNOTSUPP;
>> +}
>> +
>> +static umode_t smpro_is_visible(const void *data, enum
>> hwmon_sensor_types type,
>> +??????????????? u32 attr, int channel)
>> +{
>> +??? const struct smpro_hwmon *hwmon = data;
>> +??? unsigned int value;
>> +??? int ret;
>> +
>> +??? switch (type) {
>> +??? case hwmon_temp:
>> +??????? switch (attr) {
>> +??????? case hwmon_temp_input:
>> +??????? case hwmon_temp_label:
>> +??????? case hwmon_temp_crit:
>> +??????????? ret = regmap_read(hwmon->regmap,
>> temperature[channel].reg, &value);
>> +??????????? if (ret || value == 0xFFFF)
>> +??????????????? return 0;
>> +??????? break;
>> +??????? }
>> +??? default:
>> +??????? break;
>> +??? }
>> +
>> +??? return 0444;
>> +}
>> +
>> +static const struct hwmon_channel_info *smpro_info[] = {
>> +??? HWMON_CHANNEL_INFO(temp,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_CRIT,
>> +?????????????? HWMON_T_INPUT | HWMON_T_LABEL),
>> +??? HWMON_CHANNEL_INFO(in,
>> +?????????????? HWMON_I_INPUT | HWMON_I_LABEL,
>> +?????????????? HWMON_I_INPUT | HWMON_I_LABEL,
>> +?????????????? HWMON_I_INPUT | HWMON_I_LABEL,
>> +?????????????? HWMON_I_INPUT | HWMON_I_LABEL,
>> +?????????????? HWMON_I_INPUT | HWMON_I_LABEL),
>> +??? HWMON_CHANNEL_INFO(power,
>> +?????????????? HWMON_P_INPUT | HWMON_P_LABEL,
>> +?????????????? HWMON_P_INPUT | HWMON_P_LABEL,
>> +?????????????? HWMON_P_INPUT | HWMON_P_LABEL,
>> +?????????????? HWMON_P_INPUT | HWMON_P_LABEL,
>> +?????????????? HWMON_P_INPUT | HWMON_P_LABEL),
>> +??? HWMON_CHANNEL_INFO(curr,
>> +?????????????? HWMON_C_INPUT | HWMON_C_LABEL,
>> +?????????????? HWMON_C_INPUT | HWMON_C_LABEL,
>> +?????????????? HWMON_C_INPUT | HWMON_C_LABEL,
>> +?????????????? HWMON_C_INPUT | HWMON_C_LABEL,
>> +?????????????? HWMON_C_INPUT | HWMON_C_LABEL),
>> +??? NULL
>> +};
>> +
>> +static const struct hwmon_ops smpro_hwmon_ops = {
>> +??? .is_visible = smpro_is_visible,
>> +??? .read = smpro_read,
>> +??? .read_string = smpro_read_string,
>> +};
>> +
>> +static const struct hwmon_chip_info smpro_chip_info = {
>> +??? .ops = &smpro_hwmon_ops,
>> +??? .info = smpro_info,
>> +};
>> +
>> +static int smpro_hwmon_probe(struct platform_device *pdev)
>> +{
>> +??? struct smpro_hwmon *hwmon;
>> +??? struct device *hwmon_dev;
>> +
>> +??? hwmon = devm_kzalloc(&pdev->dev, sizeof(struct smpro_hwmon),
>> GFP_KERNEL);
>> +??? if (!hwmon)
>> +??????? return -ENOMEM;
>> +
>> +??? hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
>> +??? if (!hwmon->regmap)
>> +??????? return -ENODEV;
>> +
>> +??? hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
>> "smpro_hwmon",
>> +???????????????????????????? hwmon, &smpro_chip_info, NULL);
>> +
>> +??? return PTR_ERR_OR_ZERO(hwmon_dev);
>> +}
>> +
>> +static struct platform_driver smpro_hwmon_driver = {
>> +??? .probe??????? = smpro_hwmon_probe,
>> +??? .driver = {
>> +??????? .name??? = "smpro-hwmon",
>> +??? },
>> +};
>> +
>> +module_platform_driver(smpro_hwmon_driver);
>> +
>> +MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>");
>> +MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
>> +MODULE_DESCRIPTION("Ampere Altra SMPro hwmon driver");
>> +MODULE_LICENSE("GPL v2");
>>
>