Message-ID: <20210123163524.GA50825@roeck-us.net>
Date:   Sat, 23 Jan 2021 08:35:24 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Campion Kang <campion.kang@...antech.com.tw>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Jean Delvare <jdelvare@...e.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-hwmon@...r.kernel.org, linux-watchdog@...r.kernel.org,
        AceLan Kao <chia-lin.kao@...onical.com>
Subject: Re: [PATCH v6 5/6] hwmon: ahc1ec0-hwmon: Add sub-device hwmon for
 Advantech embedded controller

On Mon, Jan 18, 2021 at 08:37:48PM +0800, Campion Kang wrote:
> This is one of sub-device driver for Advantech embedded controller
> AHC1EC0. This driver provides sysfs ABI for Advantech related
> applications to monitor the system status.
> 
> Changed since V5:
> 	- remove unnecessary header files
> 	- Using [devm_]hwmon_device_register_with_info() to register
> hwmon driver based on reviewer's suggestion
> 
> Signed-off-by: Campion Kang <campion.kang@...antech.com.tw>
> Tested-by: Chia-Lin Kao (AceLan) <acelan.kao@...onical.com>

checkpatch --strict says:

total: 0 errors, 1 warnings, 10 checks, 683 lines checked

The MAINTAINERS warning is irrelevant, but there are a number of alignment
and other style issues. Please fix those.

> ---
>  drivers/hwmon/Kconfig         |  10 +
>  drivers/hwmon/Makefile        |   1 +
>  drivers/hwmon/ahc1ec0-hwmon.c | 660 ++++++++++++++++++++++++++++++++++

Documentation is missing.

>  3 files changed, 671 insertions(+)
>  create mode 100644 drivers/hwmon/ahc1ec0-hwmon.c
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 1ecf697d8d99..bfa007026679 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -2139,6 +2139,16 @@ config SENSORS_INTEL_M10_BMC_HWMON
>  	  sensors monitor various telemetry data of different components on the
>  	  card, e.g. board temperature, FPGA core temperature/voltage/current.
>  
> +config SENSORS_AHC1EC0_HWMON
> +	tristate "Advantech AHC1EC0 Hardware Monitor Function"
> +	depends on MFD_AHC1EC0
> +	help
> +	  This driver provide support for the hardware monitoring functionality
> +	  for Advantech AHC1EC0 embedded controller on the board.
> +
> +	  This driver provides the sysfs attributes for applications to monitor
> +	  the system status, including system temperatures, voltages, current.
> +
>  if ACPI
>  
>  comment "ACPI drivers"
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 09a86c5e1d29..0c37747e8c4f 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -45,6 +45,7 @@ obj-$(CONFIG_SENSORS_ADT7411)	+= adt7411.o
>  obj-$(CONFIG_SENSORS_ADT7462)	+= adt7462.o
>  obj-$(CONFIG_SENSORS_ADT7470)	+= adt7470.o
>  obj-$(CONFIG_SENSORS_ADT7475)	+= adt7475.o
> +obj-$(CONFIG_SENSORS_AHC1EC0_HWMON)	+= ahc1ec0-hwmon.o
>  obj-$(CONFIG_SENSORS_AMD_ENERGY) += amd_energy.o
>  obj-$(CONFIG_SENSORS_APPLESMC)	+= applesmc.o
>  obj-$(CONFIG_SENSORS_ARM_SCMI)	+= scmi-hwmon.o
> diff --git a/drivers/hwmon/ahc1ec0-hwmon.c b/drivers/hwmon/ahc1ec0-hwmon.c
> new file mode 100644
> index 000000000000..688f07e6a6e0
> --- /dev/null
> +++ b/drivers/hwmon/ahc1ec0-hwmon.c
> @@ -0,0 +1,660 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * HWMON Driver for Advantech Embedded Controller chip AHC1EC0
> + *
> + * Copyright 2020, Advantech IIoT Group
> + *
> + */
> +
> +#include <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/hwmon.h>
> +#include <linux/mfd/ahc1ec0.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +#include <linux/string.h>
> +#include <linux/types.h>
> +
> +struct ec_hwmon_attrs {
> +	const char		*name;
> +	umode_t			mode;
> +	int (*read)(struct device *dev, long *val);
> +};
> +
> +struct adv_hwmon_profile {
> +	int offset;
> +	unsigned long resolution, resolution_vin, resolution_sys, resolution_curr, resolution_power;
> +	unsigned long r1, r1_vin, r1_sys, r1_curr, r1_power;
> +	unsigned long r2, r2_vin, r2_sys, r2_curr, r2_power;
> +	int hwmon_in_list_cnt;
> +	int temp_list_cnt;
> +	int *hwmon_in_list;
> +	int *temp_list;
> +};
> +
> +struct ec_hwmon_data {
> +	struct device *dev;
> +	struct device *hwmon_dev;
> +	struct adv_ec_platform_data *adv_ec_data;
> +	unsigned long temperature[3];
> +	unsigned long ec_current[5];
> +	unsigned long power[5];
> +	unsigned long voltage[7];
> +
> +	struct ec_hw_pin_table pin_tbl;
> +	struct ec_smbuso_em0 ec_smboem0;
> +	struct adv_hwmon_profile *profile;
> +};
> +
> +static int get_ec_in_vbat_input(struct device *dev, long *val);
> +static int get_ec_in_v5_input(struct device *dev, long *val);
> +static int get_ec_in_v12_input(struct device *dev, long *val);
> +static int get_ec_in_vcore_input(struct device *dev, long *val);
> +static int get_ec_current1_input(struct device *dev, long *val);
> +static int get_ec_cpu_temp(struct device *dev, long *val);
> +static int get_ec_sys_temp(struct device *dev, long *val);
> +

Please reorder code to not require those declarations.

> +const struct ec_hwmon_attrs ec_hwmon_in_attr_template[] = {
> +	{"VBAT",	0444, get_ec_in_vbat_input},	// in1
> +	{"5VSB",	0444, get_ec_in_v5_input},	// in2
> +	{"Vin",		0444, get_ec_in_v12_input},	// in3 (== in8)
> +	{"VCORE",	0444, get_ec_in_vcore_input},	// in4
> +	{"Vin1",	0444, NULL},	// in5
> +	{"Vin2",	0444, NULL},	// in6
> +	{"System Voltage", 0444, NULL},	// in7
> +	{"Current",	0444, get_ec_current1_input},
> +};
> +
> +const struct ec_hwmon_attrs ec_temp_attrs_template[] = {
> +	{"CPU Temp",	0444, get_ec_cpu_temp},
> +	{"System Temp",	0444, get_ec_sys_temp},
> +};
> +
> +enum ec_hwmon_in_type {
> +	EC_HWMON_IN_VBAT,
> +	EC_HWMON_IN_5VSB,
> +	EC_HWMON_IN_12V,
> +	EC_HWMON_IN_VCORE,
> +	EC_HWMON_IN_VIN1,
> +	EC_HWMON_IN_VIN2,
> +	EC_HWMON_IN_SYS_VOL,
> +	EC_HWMON_IN_CURRENT,
> +};
> +
> +enum ec_temp_type {
> +	EC_TEMP_CPU,
> +	EC_TEMP_SYS,
> +};
> +
> +static int hwmon_in_list_0[] = {
> +	EC_HWMON_IN_VBAT,
> +	EC_HWMON_IN_5VSB,
> +	EC_HWMON_IN_12V,
> +	EC_HWMON_IN_VCORE,
> +	EC_HWMON_IN_CURRENT,
> +};
> +
> +static int hwmon_in_list_1[] = {
> +	EC_HWMON_IN_VBAT,
> +	EC_HWMON_IN_5VSB,
> +	EC_HWMON_IN_12V,
> +	EC_HWMON_IN_VCORE,
> +};
> +
> +static int temp_list_0[] = {
> +	EC_TEMP_CPU,
> +};
> +
> +static int temp_list_1[] = {
> +	EC_TEMP_CPU,
> +	EC_TEMP_SYS,
> +};
> +
> +static struct adv_hwmon_profile advec_profile[] = {
> +	/*
> +	 * TPC-8100TR, TPC-651T-E3AE, TPC-1251T-E3AE, TPC-1551T-E3AE,
> +	 * TPC-1751T-E3AE, TPC-1051WP-E3AE, TPC-1551WP-E3AE, TPC-1581WP-433AE,
> +	 * TPC-1782H-433AE, UNO-1483G-434AE, UNO-2483G-434AE, UNO-3483G-374AE,
> +	 * UNO-2473G, UNO-2484G-6???AE, UNO-2484G-7???AE, UNO-3283G-674AE,
> +	 * UNO-3285G-674AE

What is all this ? Please add a brief explanation (affected hardware ? chips ?)

> +	 * [0] AHC1EC0_HWMON_PRO_TEMPLATE
> +	 */
> +	{
> +		.resolution = 2929,
> +		.r1 = 1912,
> +		.r2 = 1000,
> +		.offset = 0,
> +		.hwmon_in_list_cnt = ARRAY_SIZE(hwmon_in_list_0),
> +		.temp_list_cnt = ARRAY_SIZE(temp_list_0),
> +		.hwmon_in_list = hwmon_in_list_0,
> +		.temp_list = temp_list_0,
> +	},
> +	/*
> +	 * TPC-B500-6??AE, TPC-5???T-6??AE, TPC-5???W-6??AE, TPC-B200-???AE,
> +	 * TPC-2???T-???AE, TPC-2???W-???AE
> +	 * [1] AHC1EC0_HWMON_PRO_TPC5XXX
> +	 */
> +	{
> +		.resolution = 2929,
> +		.r1 = 1912,
> +		.r2 = 1000,
> +		.offset = 0,
> +		.hwmon_in_list_cnt = ARRAY_SIZE(hwmon_in_list_1),
> +		.temp_list_cnt = ARRAY_SIZE(temp_list_0),
> +		.hwmon_in_list = hwmon_in_list_1,
> +		.temp_list = temp_list_0,
> +	},
> +	/* PR/VR4
> +	 * [2] AHC1EC0_HWMON_PRO_PRVR4
> +	 */
> +	{
> +		.resolution = 2929,
> +		.r1 = 1912,
> +		.r2 = 1000,
> +		.offset = 0,
> +		.hwmon_in_list_cnt = ARRAY_SIZE(hwmon_in_list_1),
> +		.temp_list_cnt = ARRAY_SIZE(temp_list_1),
> +		.hwmon_in_list = hwmon_in_list_1,
> +		.temp_list = temp_list_1,
> +	},
> +	/* UNO-2271G-E22AE/E23AE/E022AE/E023AE,UNO-420
> +	 * [3] AHC1EC0_HWMON_PRO_UNO2271G
> +	 */
> +	{
> +		.resolution = 2929,
> +		.r1 = 1912,
> +		.r2 = 1000,
> +		.offset = 0,
> +		.hwmon_in_list_cnt = ARRAY_SIZE(hwmon_in_list_1),
> +		.temp_list_cnt = ARRAY_SIZE(temp_list_0),
> +		.hwmon_in_list = hwmon_in_list_1,
> +		.temp_list = temp_list_0,
> +	},
> +};
> +
> +static void adv_ec_init_hwmon_profile(u32 profile, struct ec_hwmon_data *lmsensor_data)
> +{
> +	int i;
> +	struct ec_hw_pin_table *ptbl = &lmsensor_data->pin_tbl;
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +	struct ec_dynamic_table *dym_tbl = adv_ec_data->dym_tbl;
> +
> +	if (profile >= ARRAY_SIZE(advec_profile))
> +		return;

This can not happen. Please no unnecessary error checks.

> +
> +	lmsensor_data->profile = &advec_profile[profile];
> +
> +	for (i = 0; i < EC_MAX_TBL_NUM ; i++) {
> +		switch (dym_tbl[i].device_id) {
> +		case EC_DID_CMOSBAT:
> +			ptbl->vbat[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vbat[1] = 1;
> +			break;
> +		case EC_DID_CMOSBAT_X2:
> +			ptbl->vbat[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vbat[1] = 2;
> +			break;
> +		case EC_DID_CMOSBAT_X10:
> +			ptbl->vbat[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vbat[1] = 10;
> +			break;
> +		case EC_DID_5VS0:
> +		case EC_DID_5VS5:
> +			ptbl->v5[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->v5[1] = 1;
> +			break;
> +		case EC_DID_5VS0_X2:
> +		case EC_DID_5VS5_X2:
> +			ptbl->v5[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->v5[1] = 2;
> +			break;
> +		case EC_DID_5VS0_X10:
> +		case EC_DID_5VS5_X10:
> +			ptbl->v5[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->v5[1] = 10;
> +			break;
> +		case EC_DID_12VS0:
> +			ptbl->v12[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->v12[1] = 1;
> +			break;
> +		case EC_DID_12VS0_X2:
> +			ptbl->v12[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->v12[1] = 2;
> +			break;
> +		case EC_DID_12VS0_X10:
> +			ptbl->v12[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->v12[1] = 10;
> +			break;
> +		case EC_DID_VCOREA:
> +		case EC_DID_VCOREB:
> +			ptbl->vcore[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vcore[1] = 1;
> +			break;
> +		case EC_DID_VCOREA_X2:
> +		case EC_DID_VCOREB_X2:
> +			ptbl->vcore[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vcore[1] = 2;
> +			break;
> +		case EC_DID_VCOREA_X10:
> +		case EC_DID_VCOREB_X10:
> +			ptbl->vcore[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vcore[1] = 10;
> +			break;
> +		case EC_DID_DC:
> +			ptbl->vdc[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vdc[1] = 1;
> +			break;
> +		case EC_DID_DC_X2:
> +			ptbl->vdc[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vdc[1] = 2;
> +			break;
> +		case EC_DID_DC_X10:
> +			ptbl->vdc[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->vdc[1] = 10;
> +			break;
> +		case EC_DID_CURRENT:
> +			ptbl->ec_current[0] = dym_tbl[i].hw_pin_num;
> +			ptbl->ec_current[1] = 1;
> +			break;
> +		case EC_DID_SMBOEM0:
> +			lmsensor_data->ec_smboem0.hw_pin_num = dym_tbl[i].hw_pin_num;
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +}
> +
> +static int get_ec_in_vbat_input(struct device *dev, long *val)
> +{
> +	unsigned int temp = 0;
> +	unsigned long voltage = 0;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	struct ec_hw_pin_table *ptbl = &lmsensor_data->pin_tbl;
> +	struct adv_hwmon_profile *profile = lmsensor_data->profile;
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	temp = read_ad_value(adv_ec_data, ptbl->vbat[0], ptbl->vbat[1]);
> +
> +	if (profile->r2 != 0)
> +		voltage = temp * (profile->r1 + profile->r2) / profile->r2;
> +
> +	if (profile->resolution != 0)
> +		voltage =  temp * profile->resolution / 1000 / 1000;
> +
> +	if (profile->offset != 0)
> +		voltage += (int)profile->offset * 100;
> +
> +	lmsensor_data->voltage[0] = 10 * voltage;
> +
> +	*val = lmsensor_data->voltage[0];
> +	return 0;
> +}
> +
> +static int get_ec_in_v5_input(struct device *dev, long *val)
> +{
> +	unsigned int temp;
> +	unsigned long voltage = 0;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +

Please no empty lines in variable declarations.

> +	struct ec_hw_pin_table *ptbl = &lmsensor_data->pin_tbl;
> +	struct adv_hwmon_profile *profile = lmsensor_data->profile;
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	temp = read_ad_value(adv_ec_data, ptbl->v5[0], ptbl->v5[1]);
> +
> +	if (profile->r2 != 0)
> +		voltage = temp * (profile->r1 + profile->r2) / profile->r2;
> +
> +	if (profile->resolution != 0)
> +		voltage =  temp * profile->resolution / 1000 / 1000;
> +
> +	if (profile->offset != 0)
> +		voltage += (int)profile->offset * 100;
> +
> +	lmsensor_data->voltage[1] = 10 * voltage;
> +
> +	*val = lmsensor_data->voltage[1];
> +	return 0;
> +}
> +
> +static int get_ec_in_v12_input(struct device *dev, long *val)
> +{
> +	int temp;
> +	unsigned long voltage = 0;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	struct ec_hw_pin_table *ptbl = &lmsensor_data->pin_tbl;
> +	struct adv_hwmon_profile *profile = lmsensor_data->profile;
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	temp = read_ad_value(adv_ec_data, ptbl->v12[0], ptbl->v12[1]);
> +	if (temp == -1)
> +		temp = read_ad_value(adv_ec_data, ptbl->vdc[0], ptbl->vdc[1]);
> +
> +	if (profile->r2 != 0)
> +		voltage = temp * (profile->r1 + profile->r2) / profile->r2;
> +
> +	if (profile->resolution != 0)
> +		voltage =  temp * profile->resolution / 1000 / 1000;
> +
> +	if (profile->offset != 0)
> +		voltage += profile->offset * 100;
> +
> +	lmsensor_data->voltage[2] = 10 * voltage;
> +
> +	*val = lmsensor_data->voltage[2];
> +	return 0;
> +}
> +
> +static int get_ec_in_vcore_input(struct device *dev, long *val)
> +{
> +	int temp;
> +	unsigned int voltage = 0;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	struct ec_hw_pin_table *ptbl = &lmsensor_data->pin_tbl;
> +	struct adv_hwmon_profile *profile = lmsensor_data->profile;
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	temp = read_ad_value(adv_ec_data, ptbl->vcore[0], ptbl->vcore[1]);
> +
> +	if (profile->r2 != 0)
> +		voltage = temp * (profile->r1 + profile->r2) / profile->r2;
> +
> +	if (profile->resolution != 0)
> +		voltage = temp * profile->resolution / 1000 / 1000;
> +
> +	if (profile->offset != 0)
> +		voltage += profile->offset * 100;
> +
> +	lmsensor_data->voltage[3] = 10 * voltage;
> +
> +	*val = lmsensor_data->voltage[3];
> +	return 0;
> +}
> +
> +static int get_ec_current1_input(struct device *dev, long *val)
> +{
> +	int temp;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	struct ec_hw_pin_table *ptbl = &lmsensor_data->pin_tbl;
> +	struct adv_hwmon_profile *profile = lmsensor_data->profile;
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	temp = read_ad_value(adv_ec_data, ptbl->ec_current[0], ptbl->ec_current[1]);
> +
> +	if (profile->r2 != 0)
> +		temp = temp * (profile->r1 + profile->r2) / profile->r2;
> +
> +	if (profile->resolution != 0)
> +		temp = temp * profile->resolution / 1000 / 1000;
> +
> +	if (profile->offset != 0)
> +		temp += profile->offset * 100;
> +
> +	lmsensor_data->ec_current[3] = 10 * temp;
> +
> +	*val = lmsensor_data->ec_current[3];
> +	return 0;
> +}
> +
> +static int get_ec_cpu_temp(struct device *dev, long *val)
> +{
> +	#define EC_ACPI_THERMAL1_REMOTE_TEMP 0x61

Pease move defines to top of file. Also, please use

#define<space>IDENTIFER<tab>value

> +
> +	unsigned char value;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	read_acpi_value(adv_ec_data, EC_ACPI_THERMAL1_REMOTE_TEMP, &value);

This is not an appropriate function name for a device specific exported
function. The function name should have a prefix.

Also, the error code from read_acpi_value needs to be checked
and handled.

> +	*val = 1000 * value;
> +	return 0;
> +}
> +
> +static int get_ec_sys_temp(struct device *dev, long *val)
> +{
> +	#define EC_ACPI_THERMAL1_LOCAL_TEMP 0x60
> +
> +	unsigned char value;
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +	struct adv_ec_platform_data *adv_ec_data = lmsensor_data->adv_ec_data;
> +
> +	read_acpi_value(adv_ec_data, EC_ACPI_THERMAL1_LOCAL_TEMP, &value);
> +	*val = 1000 * value;
> +	return 0;
> +}
> +
> +
> +static int
> +ahc1ec0_read_in(struct device *dev, u32 attr, int channel, long *val)
> +{
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	if (!(lmsensor_data && lmsensor_data->profile))
> +		return -EINVAL;

This can not happen. Also, please don't use double negations.

> +
> +	if (attr == hwmon_in_input &&
> +		lmsensor_data->profile->hwmon_in_list_cnt > channel) {

This is unnecessary. Again, please drop all those unnecessary checks.

> +		int index = lmsensor_data->profile->hwmon_in_list[channel];
> +		const struct ec_hwmon_attrs *ec_hwmon_attr = &ec_hwmon_in_attr_template[index];
> +
> +		return ec_hwmon_attr->read(dev, val);
> +	}
> +
> +	return -EOPNOTSUPP;
> +}
> +
> +static int
> +ahc1ec0_read_temp(struct device *dev, u32 attr, int channel, long *val)
> +{
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	if (!(lmsensor_data && lmsensor_data->profile))
> +		return -EINVAL;
> +
> +	switch (attr) {
> +	case hwmon_temp_input:
> +		if (lmsensor_data->profile->temp_list_cnt > channel) {
> +			int index = lmsensor_data->profile->temp_list[channel];
> +			const struct ec_hwmon_attrs *devec_hwmon_attr =
> +				&ec_temp_attrs_template[index];
> +
> +			return devec_hwmon_attr->read(dev, val);
> +		}
> +		return -EOPNOTSUPP;
> +	case hwmon_temp_crit:
> +		// both CPU temp and System temp are all this value
> +		*val = 100000;
> +		return 0;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +}
> +
> +static int
> +ahc1ec0_read_string(struct device *dev,
> +					enum hwmon_sensor_types type,
> +					u32 attr,
> +					int channel,
> +					const char **str)
> +{
> +	struct ec_hwmon_data *lmsensor_data = dev_get_drvdata(dev);
> +
> +	if (!(lmsensor_data && lmsensor_data->profile))
> +		return -EINVAL;
> +
> +	if ((type == hwmon_in && attr == hwmon_in_label) &&
> +		(lmsensor_data->profile->hwmon_in_list_cnt > channel)) {

lmsensor_data->profile->hwmon_in_list_cnt > channel is unnecessary, and
the () around it as well.

> +		int index = lmsensor_data->profile->hwmon_in_list[channel];
> +		const struct ec_hwmon_attrs *ec_hwmon_attr = &ec_hwmon_in_attr_template[index];
> +
> +		*str = ec_hwmon_attr->name;
> +		return 0;
> +	}
> +
> +	if ((type == hwmon_temp && attr == hwmon_temp_label) &&
> +		(lmsensor_data->profile->temp_list_cnt > channel)) {
> +		int index = lmsensor_data->profile->temp_list[channel];
> +		const struct ec_hwmon_attrs *ec_hwmon_attr = &ec_temp_attrs_template[index];
> +
> +		*str = ec_hwmon_attr->name;
> +		return 0;
> +	}
> +
> +	return -EOPNOTSUPP;
> +}
> +
> +static int
> +ahc1ec0_read(struct device *dev,
> +			enum hwmon_sensor_types type,
> +			u32 attr,
> +			int channel,
> +			long *val)

Too many line splits. Please reduce to minuimum required.

> +{
> +	switch (type) {
> +	case hwmon_in:
> +		return ahc1ec0_read_in(dev, attr, channel, val);
> +	case hwmon_temp:
> +		return ahc1ec0_read_temp(dev, attr, channel, val);
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +}
> +
> +static umode_t
> +ec_hwmon_in_visible(const void *data, u32 attr, int channel)
> +{
> +	switch (attr) {
> +	case hwmon_in_input:
> +	case hwmon_in_label:
> +		return 0444;
> +	default:
> +		return 0;
> +	}

The code needs to take channel into account, and return 0 if a voltage sensor
is not supported.

> +}
> +
> +static umode_t
> +ec_temp_in_visible(const void *data, u32 attr, int channel)
> +{
> +	switch (attr) {
> +	case hwmon_temp_input:
> +	case hwmon_temp_crit:
> +	case hwmon_temp_label:
> +		return 0444;
> +	default:
> +		return 0;
> +	}

The code needs to take channel into account, and return 0 if the second
temperature sensor is not supported.

> +}
> +
> +static umode_t
> +ahc1ec0_is_visible(const void *data,
> +					enum hwmon_sensor_types type, u32 attr, int channel)

Now this is a really odd (nd unnecessary) continuation line.

> +{
> +	switch (type) {
> +	case hwmon_in:
> +		return ec_hwmon_in_visible(data, attr, channel);
> +	case hwmon_temp:
> +		return ec_temp_in_visible(data, attr, channel);
> +	default:
> +		return 0;
> +	}
> +}
> +
> +static const u32 ahc1ec0_in_config[] = {
> +	HWMON_I_INPUT | HWMON_I_LABEL,
> +	HWMON_I_INPUT | HWMON_I_LABEL,
> +	HWMON_I_INPUT | HWMON_I_LABEL,
> +	HWMON_I_INPUT | HWMON_I_LABEL,
> +	0
> +};
> +
> +static const struct hwmon_channel_info ahc1ec0_in = {
> +	.type = hwmon_in,
> +	.config = ahc1ec0_in_config,
> +};
> +
> +static const u32 ahc1ec0_temp_config[] = {
> +	HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LABEL,

I don't think this works as intended. it only lists one temperature
sensor, but the code clearly suggests that there can be two.

> +	0
> +};
> +
> +static const struct hwmon_channel_info ahc1ec0_temp = {
> +	.type = hwmon_temp,
> +	.config = ahc1ec0_temp_config,
> +};
> +
> +static const struct hwmon_channel_info *ahc1ec0_info[] = {
> +	&ahc1ec0_in,
> +	&ahc1ec0_temp,
> +	NULL
> +};
> +
> +static const struct hwmon_ops ahc1ec0_hwmon_ops = {
> +	.is_visible = ahc1ec0_is_visible,
> +	.read = ahc1ec0_read,
> +	.read_string = ahc1ec0_read_string,
> +};
> +
> +static const struct hwmon_chip_info ahc1ec0_chip_info = {
> +	.ops = &ahc1ec0_hwmon_ops,
> +	.info = ahc1ec0_info,
> +};
> +
> +static int adv_ec_hwmon_probe(struct platform_device *pdev)
> +{
> +	int ret;
> +	u32 profile;
> +	struct device *dev = &pdev->dev;
> +	struct adv_ec_platform_data *adv_ec_data;
> +	struct ec_hwmon_data *lmsensor_data;
> +
> +	adv_ec_data = dev_get_drvdata(dev->parent);
> +	if (!adv_ec_data)
> +		return -EINVAL;
> +
> +	ret = device_property_read_u32(dev->parent, "advantech,hwmon-profile", &profile);
> +	if (ret < 0) {
> +		dev_err(dev, "get hwmon-profile failed! (%d)", ret);
> +		return ret;
> +	}
> +
> +	if (!(profile < ARRAY_SIZE(advec_profile))) {

Please no double negations.
	if (profile >= ARRAY_SIZE(advec_profile))
is much easier to understand.

> +		dev_err(dev, "not support hwmon profile(%d)!\n", profile);
> +		return -EINVAL;
> +	}
> +
> +	lmsensor_data = devm_kzalloc(dev, sizeof(struct ec_hwmon_data), GFP_KERNEL);
> +	if (!lmsensor_data)
> +		return -ENOMEM;
> +
> +	lmsensor_data->adv_ec_data = adv_ec_data;
> +	lmsensor_data->dev = dev;
> +	dev_set_drvdata(dev, lmsensor_data);
> +
> +	adv_ec_init_hwmon_profile(profile, lmsensor_data);
> +
> +	lmsensor_data->hwmon_dev  = devm_hwmon_device_register_with_info(dev,
> +			"ahc1ec0.hwmon", lmsensor_data, &ahc1ec0_chip_info, NULL);
> +
> +	return PTR_ERR_OR_ZERO(lmsensor_data->hwmon_dev);
> +}
> +
> +static struct platform_driver adv_hwmon_drv = {
> +	.driver = {
> +		.name = "ahc1ec0-hwmon",
> +	},
> +	.probe = adv_ec_hwmon_probe,
> +};
> +module_platform_driver(adv_hwmon_drv);
> +
> +MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_ALIAS("platform:ahc1ec0-hwmon");
> +MODULE_DESCRIPTION("Advantech Embedded Controller HWMON Driver.");
> +MODULE_AUTHOR("Campion Kang <campion.kang@...antech.com.tw>");
> +MODULE_AUTHOR("Jianfeng Dai <jianfeng.dai@...antech.com.cn>");
> +MODULE_VERSION("1.0");

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