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Date:	Mon, 14 Jul 2014 12:05:20 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Wei-Chun Pan <weichun.pan@...antech.com.tw>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Jean Delvare <jdelvare@...e.de>,
	"Louis.Lu" <Louis.Lu@...antech.com.tw>,
	"Neo.Lo" <neo.lo@...antech.com.tw>,
	"Hank.Peng" <Hank.Peng@...antech.com.tw>,
	"Kevin.Ong" <Kevin.Ong@...antech.com.tw>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] hwmon: (imanager2) Add support for IT8516/18/28

On Mon, Jul 14, 2014 at 05:54:46AM -0700, Wei-Chun Pan wrote:
> Signed-off-by: Wei-Chun Pan <weichun.pan@...antech.com.tw>

No explanation, no patch version, and no change log, meaning we'll
have to go back to your previous submissions to verify what you changed
and why, and if you addressed all comments. This will take a while.

Other comments below.

Guenter

> ---
>  drivers/hwmon/Kconfig         |   5 +
>  drivers/hwmon/Makefile        |   1 +
>  drivers/hwmon/imanager2_hwm.c | 768 ++++++++++++++++++++++++++++++++++++++++++

Documentation/hwmon/imanager2_hwm missing.

>  3 files changed, 774 insertions(+)
>  create mode 100644 drivers/hwmon/imanager2_hwm.c
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index bc196f4..7524fc3 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -39,6 +39,11 @@ config HWMON_DEBUG_CHIP
>  
>  comment "Native drivers"
>  
> +config SENSORS_IMANAGER2
> +	tristate "Support for Advantech iManager2 EC H.W. Monitor"
> +	select MFD_CORE
> +	depends on MFD_IMANAGER2
> +
Alphabetic order please.

>  config SENSORS_AB8500
>  	tristate "AB8500 thermal monitoring"
>  	depends on AB8500_GPADC && AB8500_BM
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index c48f987..a2c8f07 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -146,6 +146,7 @@ obj-$(CONFIG_SENSORS_W83L785TS)	+= w83l785ts.o
>  obj-$(CONFIG_SENSORS_W83L786NG)	+= w83l786ng.o
>  obj-$(CONFIG_SENSORS_WM831X)	+= wm831x-hwmon.o
>  obj-$(CONFIG_SENSORS_WM8350)	+= wm8350-hwmon.o
> +obj-$(CONFIG_SENSORS_IMANAGER2)	+= imanager2_hwm.o
>  
Alphabetic order please.

>  obj-$(CONFIG_PMBUS)		+= pmbus/
>  
> diff --git a/drivers/hwmon/imanager2_hwm.c b/drivers/hwmon/imanager2_hwm.c
> new file mode 100644
> index 0000000..335bffb
> --- /dev/null
> +++ b/drivers/hwmon/imanager2_hwm.c
> @@ -0,0 +1,768 @@
> +/*
> + * imanager2_hwm.c - HW Monitoring interface for Advantech EC IT8516/18/28
> + * Copyright (C) 2014  Richard Vidal-Dorsch <richard.dorsch@...antech.com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 3 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/mfd/imanager2_ec.h>
> +
> +#define DRV_NAME	"imanager2_hwm"
> +#define DRV_VERSION	"4.0.1"
> +
> +/* ADC */
> +#define EC_ADC_RESOLUTION_MAX	0x03FF	/* 10-bit */
> +#define EC_ADC_VALUE_MAX	3000	/* max: 3000 mV or mA */
> +
> +/* Thermal */
> +#define EC_THERMAL_ZONE_MAX	4
> +
> +enum thermaltype {
> +	none,
> +	sys1,
> +	cpu,
> +	sys3,
> +	sys2,
> +};
> +
> +struct ec_thermalzone {
> +	u8 channel,
> +	   addr,
> +	   cmd,
> +	   status,
> +	   fancode,
> +	   temp;
> +};
> +
> +/* Tacho */
> +#define EC_MAX_IO_FAN	3
> +
> +/* Voltage */
> +struct volt_item {
> +	u8 did;
> +	const char *name;
> +	int factor;
> +	bool visible;
> +};
> +
> +static struct volt_item ec_volt_table[] = {
> +	{
> +		.did = adcmosbat,
> +		.name = "BAT CMOS",
> +	},
> +	{
> +		.did = adcbat,
> +		.name = "BAT",
> +	},
> +	{
> +		.did = adc5vs0,
> +		.name = "5V S0",
> +	},
> +	{
> +		.did = adv5vs5,
> +		.name = "5V S5",
> +	},
> +	{
> +		.did = adc33vs0,
> +		.name = "3V3 S0",
> +	},
> +	{
> +		.did = adc33vs5,
> +		.name = "3V3 S5",
> +	},
> +	{
> +		.did = adv12vs0,
> +		.name = "12V S0",
> +	},
> +	{
> +		.did = adcvcorea,
> +		.name = "Vcore A",
> +	},
> +	{
> +		.did = adcvcoreb,
> +		.name = "Vcore B",
> +	},
> +	{
> +		.did = adcdc,
> +		.name = "DC",
> +	},
> +	{
> +		.did = adcdcstby,
> +		.name = "DC Standby",
> +	},
> +	{
> +		.did = adcdcother,
> +		.name = "DC Other",
> +	},
> +};
> +
> +static int imanager2_volt_get_value_by_io(struct imanager2 *ec, int index,
> +					  u8 *buf)
> +{
> +	u8 item = ec->table.devid2itemnum[ec_volt_table[index].did];
> +	u8 pin = ec->table.pinnum[item];
> +	u8 portnum;
> +	int ret;
> +
> +	ret = imanager2_mbox_io_read(EC_CMD_ADC_INDEX, pin, &portnum, 1);
> +	if (ret)
> +		return ret;
> +	if (portnum == EC_ERROR)
> +		return -ENXIO;
> +
> +	ret = imanager2_mbox_io_simple_read(EC_CMD_ADC_READ_LSB, &buf[1]);
> +	if (ret)
> +		return ret;
> +
> +	return imanager2_mbox_io_simple_read(EC_CMD_ADC_READ_MSB, &buf[0]);
> +}
> +
> +static int imanager2_volt_get_value(struct imanager2 *ec, int index,
> +				    u32 *volt_mvolt)
> +{
> +	int ret;
> +	u8 tmp[2];
> +
> +	mutex_lock(&ec->lock);
> +
> +	if (ec->flag & EC_FLAG_MAILBOX)
> +		ret = imanager2_mbox_read_data(ec->flag,
> +					       EC_CMD_MAILBOX_READ_HW_PIN,
> +					       ec_volt_table[index].did,
> +					       tmp, 2);
> +	else
> +		ret = imanager2_volt_get_value_by_io(ec, index, tmp);
> +
> +	mutex_unlock(&ec->lock);
> +
> +	if (ret)
> +		return ret;
> +
> +	*volt_mvolt = (((tmp[0] << 8) | tmp[1]) & EC_ADC_RESOLUTION_MAX) *
> +		      ec_volt_table[index].factor *
> +		      DIV_ROUND_CLOSEST(EC_ADC_VALUE_MAX,
> +					EC_ADC_RESOLUTION_MAX);
> +
> +	return 0;
> +}
> +
> +static void imanager2_volt_init(struct imanager2 *ec)
> +{
> +	u8 did;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ec_volt_table); i++) {
> +		did = ec_volt_table[i].did;
> +
> +		if (ec->table.devid2itemnum[did] != EC_TABLE_ITEM_UNUSED) {
> +			ec_volt_table[i].factor = 1;
> +			ec_volt_table[i].visible = true;
> +		} else if (ec->table.devid2itemnum[did + 1] !=
> +			   EC_TABLE_ITEM_UNUSED) {
> +			ec_volt_table[i].did += 1;
> +			ec_volt_table[i].factor = 2;
> +			ec_volt_table[i].visible = true;
> +		} else if (ec->table.devid2itemnum[did + 2] !=
> +			   EC_TABLE_ITEM_UNUSED) {
> +			ec_volt_table[i].did += 2;
> +			ec_volt_table[i].factor = 10;
> +			ec_volt_table[i].visible = true;
> +		} else {
> +			ec_volt_table[i].visible = false;
> +		}
> +	}
> +}
> +
> +static ssize_t show_in(struct device *dev, struct device_attribute *dev_attr,
> +		       char *buf)
> +{
> +	struct imanager2 *ec = dev_get_drvdata(dev);
> +	u32 val;
> +	int ret = imanager2_volt_get_value(ec,
> +					   to_sensor_dev_attr(dev_attr)->index,
> +					   &val);
> +	if (ret)
> +		return ret;
> +
> +	return sprintf(buf, "%u\n", val);
> +}
> +
> +static ssize_t show_in_label(struct device *dev,
> +			     struct device_attribute *dev_attr, char *buf)
> +{
> +	return sprintf(buf, "%s\n",
> +		       ec_volt_table[to_sensor_dev_attr(dev_attr)->index].name);
> +}
> +
> +static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
> +static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
> +static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
> +static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
> +static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
> +static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in, NULL, 5);
> +static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in, NULL, 6);
> +static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, show_in, NULL, 7);
> +static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, show_in, NULL, 8);
> +static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, show_in, NULL, 9);
> +static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, show_in, NULL, 10);
> +static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, show_in, NULL, 11);
> +
> +static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
> +static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
> +static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
> +static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
> +static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_in_label, NULL, 4);
> +static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_in_label, NULL, 5);
> +static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_in_label, NULL, 6);
> +static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, show_in_label, NULL, 7);
> +static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, show_in_label, NULL, 8);
> +static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_in_label, NULL, 9);
> +static SENSOR_DEVICE_ATTR(in10_label, S_IRUGO, show_in_label, NULL, 10);
> +static SENSOR_DEVICE_ATTR(in11_label, S_IRUGO, show_in_label, NULL, 11);
> +
> +static struct attribute *imanager2_volt_attrs[] = {
> +	&sensor_dev_attr_in0_label.dev_attr.attr,
> +	&sensor_dev_attr_in0_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in1_label.dev_attr.attr,
> +	&sensor_dev_attr_in1_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in2_label.dev_attr.attr,
> +	&sensor_dev_attr_in2_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in3_label.dev_attr.attr,
> +	&sensor_dev_attr_in3_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in4_label.dev_attr.attr,
> +	&sensor_dev_attr_in4_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in5_label.dev_attr.attr,
> +	&sensor_dev_attr_in5_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in6_label.dev_attr.attr,
> +	&sensor_dev_attr_in6_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in7_label.dev_attr.attr,
> +	&sensor_dev_attr_in7_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in8_label.dev_attr.attr,
> +	&sensor_dev_attr_in8_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in9_label.dev_attr.attr,
> +	&sensor_dev_attr_in9_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in10_label.dev_attr.attr,
> +	&sensor_dev_attr_in10_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_in11_label.dev_attr.attr,
> +	&sensor_dev_attr_in11_input.dev_attr.attr,
> +
> +	NULL
> +};
> +
> +static umode_t imanager2_volt_mode(struct kobject *kobj, struct attribute *attr,
> +				   int index)
> +{
> +	struct device_attribute *dev_attr;
> +
> +	dev_attr = container_of(attr, struct device_attribute, attr);
> +	if (!ec_volt_table[to_sensor_dev_attr(dev_attr)->index].visible)
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +static const struct attribute_group imanager2_volt_group = {
> +	.attrs = imanager2_volt_attrs,
> +	.is_visible = imanager2_volt_mode,
> +};
> +
> +/* Current */
> +struct curr_item {
> +	const u8 did;
> +	const char *name;
> +	bool visible;
> +};
> +
> +static struct curr_item ec_curr_table[] = {
> +	{
> +		.did = adccurrent,
> +		.name = "IMON"
> +	},
> +};
> +
> +static int imanager2_curr_get_value(struct imanager2 *ec, int index,
> +				    u32 *curr_mamp)
> +{
> +	int ret;
> +	u8 tmp[5];
> +	u16 value, factor;
> +	u32 baseunit = 1;
> +
> +	mutex_lock(&ec->lock);
> +	ret = imanager2_mbox_read_data(ec->flag, EC_CMD_MAILBOX_READ_HW_PIN,
> +				       ec_curr_table[index].did, tmp,
> +				       ARRAY_SIZE(tmp));
> +	mutex_unlock(&ec->lock);
> +
> +	if (ret)
> +		return ret;
> +
> +	value = ((tmp[0] << 8) | tmp[1]) & EC_ADC_RESOLUTION_MAX;
> +	factor = (tmp[2] << 8) | tmp[3];

Is it guaranteed that factor is never 0 ? If not, this may result
in a division by 0 error.

> +
> +	while (tmp[4]++)
> +		baseunit *= 10;
> +
> +	*curr_mamp = DIV_ROUND_CLOSEST(value * baseunit * EC_ADC_VALUE_MAX,
> +				       EC_ADC_RESOLUTION_MAX * factor);
> +
> +	return 0;
> +}
> +
> +static void imanager2_curr_init(struct imanager2 *ec)
> +{
> +	u8 did;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ec_curr_table); i++) {
> +		did = ec_curr_table[i].did;
> +		if (ec->table.devid2itemnum[did] != EC_TABLE_ITEM_UNUSED)
> +			ec_curr_table[i].visible = ec->flag & EC_FLAG_MAILBOX;
> +		else
> +			ec_curr_table[i].visible = false;
> +	}
> +}
> +
> +static ssize_t show_curr(struct device *dev, struct device_attribute *dev_attr,
> +			 char *buf)
> +{
> +	struct imanager2 *ec = dev_get_drvdata(dev);
> +	u32 val;
> +	int ret = imanager2_curr_get_value(ec,
> +					   to_sensor_dev_attr(dev_attr)->index,
> +					   &val);
> +	if (ret)
> +		return ret;
> +
> +	return sprintf(buf, "%u\n", val);
> +}
> +
> +static ssize_t show_curr_label(struct device *dev,
> +			       struct device_attribute *dev_attr, char *buf)
> +{
> +	return sprintf(buf, "%s\n",
> +		       ec_curr_table[to_sensor_dev_attr(dev_attr)->index].name);
> +}
> +
> +static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, show_curr, NULL, 0);
> +static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_curr_label, NULL, 0);
> +
> +static struct attribute *imanager2_curr_attrs[] = {
> +	&sensor_dev_attr_curr1_label.dev_attr.attr,
> +	&sensor_dev_attr_curr1_input.dev_attr.attr,
> +
> +	NULL
> +};
> +
> +static umode_t imanager2_curr_mode(struct kobject *kobj, struct attribute *attr,
> +				   int index)
> +{
> +	struct device_attribute *dev_attr;
> +
> +	dev_attr = container_of(attr, struct device_attribute, attr);
> +	if (!ec_curr_table[to_sensor_dev_attr(dev_attr)->index].visible)
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +static const struct attribute_group imanager2_curr_group = {
> +	.attrs = imanager2_curr_attrs,
> +	.is_visible = imanager2_curr_mode,
> +};
> +
> +/* Temperature */
> +struct temp_item {
> +	const char *name;
> +	const u8 zonetype_value;
> +	u8 zonetype_acpireg;
> +	bool visible;
> +};
> +
> +static struct temp_item ec_temp_table[] = {
> +	{
> +		.name = "Temp SYS",
> +		.zonetype_value = sys1,
> +		.zonetype_acpireg = EC_ACPIRAM_ADDR_LOCAL_TEMPERATURE(1)
> +	},
> +	{
> +		.name = "Temp CPU",
> +		.zonetype_value = cpu,
> +		.zonetype_acpireg = EC_ACPIRAM_ADDR_REMOTE_TEMPERATURE(1)
> +	},
> +	{
> +		.name = "Temp SYS3",
> +		.zonetype_value = sys3,
> +		.zonetype_acpireg = EC_ACPIRAM_ADDR_LOCAL_TEMPERATURE(2)
> +	},
> +	{
> +		.name = "Temp SYS2",
> +		.zonetype_value = sys2,
> +		.zonetype_acpireg = EC_ACPIRAM_ADDR_REMOTE_TEMPERATURE(2)
> +	},
> +};
> +
> +static int imanager2_temp_get_value(struct imanager2 *ec, int index,
> +				    s32 *temp_mcelsius)
> +{
> +	int ret;
> +	s8 tmp;
> +
> +	mutex_lock(&ec->lock);
> +	ret = imanager2_mbox_read_ram_support_io(
> +		ec->flag, EC_RAM_BANK_ACPI,
> +		ec_temp_table[index].zonetype_acpireg,
> +		(u8 *)&tmp, 1);
> +	mutex_unlock(&ec->lock);
> +
> +	if (ret)
> +		return ret;
> +
> +	*temp_mcelsius = tmp * 1000;
> +
> +	return 0;
> +}
> +
> +static void imanager2_temp_init(struct imanager2 *ec)
> +{
> +	int i, thm, ret;
> +	u8 tmltype, smbid, fanid;
> +	struct ec_thermalzone zone;
> +
> +	for (i = 0; i < ARRAY_SIZE(ec_temp_table); i++)
> +		ec_temp_table[i].visible = false;
> +
> +	for (thm = 0; thm < EC_THERMAL_ZONE_MAX; thm++) {
> +		mutex_lock(&ec->lock);
> +
> +		if (ec->flag & EC_FLAG_MAILBOX) {
> +			int len = sizeof(struct ec_thermalzone);

Checkpatch warning.

> +			ret = imanager2_mbox_read_thermalzone(ec->flag, thm,
> +							      &smbid, &fanid,
> +							      (u8 *)&zone,
> +							      &len);
> +		} else {
> +			ret = imanager2_mbox_io_read(
> +				EC_CMD_HWRAM_READ,
> +				EC_HWRAM_ADDR_THERMAL_SOURCE_SMB_STATUS(thm),
> +				&zone.status, 1);
> +		}
> +
> +		mutex_unlock(&ec->lock);
> +
> +		if (ret)
> +			continue;
> +
> +		tmltype = (zone.status >> 5);
> +
> +		for (i = 0; i < ARRAY_SIZE(ec_temp_table); i++) {
> +			if (tmltype == ec_temp_table[i].zonetype_value) {
> +				ec_temp_table[i].visible = true;
> +				break;
> +			}
> +		}
> +	}
> +}
> +
> +static ssize_t show_temp(struct device *dev, struct device_attribute *dev_attr,
> +			 char *buf)
> +{
> +	struct imanager2 *ec = dev_get_drvdata(dev);
> +	s32 val;
> +	int ret = imanager2_temp_get_value(ec,
> +					   to_sensor_dev_attr(dev_attr)->index,
> +					   &val);
> +	if (ret)
> +		return ret;
> +
> +	return sprintf(buf, "%d\n", val);
> +}
> +
> +static ssize_t show_temp_label(struct device *dev,
> +			       struct device_attribute *dev_attr, char *buf)
> +{
> +	return sprintf(buf, "%s\n",
> +		       ec_temp_table[to_sensor_dev_attr(dev_attr)->index].name);
> +}
> +
> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
> +static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
> +static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
> +static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
> +
> +static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL, 0);
> +static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_temp_label, NULL, 1);
> +static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, show_temp_label, NULL, 2);
> +static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, show_temp_label, NULL, 3);
> +
> +static struct attribute *imanager2_temp_attrs[] = {
> +	&sensor_dev_attr_temp1_label.dev_attr.attr,
> +	&sensor_dev_attr_temp1_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_temp2_label.dev_attr.attr,
> +	&sensor_dev_attr_temp2_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_temp3_label.dev_attr.attr,
> +	&sensor_dev_attr_temp3_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_temp4_label.dev_attr.attr,
> +	&sensor_dev_attr_temp4_input.dev_attr.attr,
> +
> +	NULL
> +};
> +
> +static umode_t imanager2_temp_mode(struct kobject *kobj, struct attribute *attr,
> +				   int index)
> +{
> +	struct device_attribute *dev_attr;
> +
> +	dev_attr = container_of(attr, struct device_attribute, attr);
> +	if (!ec_temp_table[to_sensor_dev_attr(dev_attr)->index].visible)
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +static const struct attribute_group imanager2_temp_group = {
> +	.attrs = imanager2_temp_attrs,
> +	.is_visible = imanager2_temp_mode,
> +};
> +
> +/* Fan Speed */
> +struct fan_item {
> +	const u8 did;
> +	const char *name;
> +	u8 fspeed_acpireg;
> +	bool visible;
> +};
> +
> +static struct fan_item ec_fan_table[] = {
> +	{
> +		.did = tacho0,
> +		.name = "Fan CPU",
> +		.fspeed_acpireg = 0,

It is not necessary to set such constants to 0.

> +		.visible = false
> +	},
> +	{
> +		.did = tacho1,
> +		.name = "Fan SYS",
> +		.fspeed_acpireg = 0,
> +		.visible = false
> +	},
> +	{
> +		.did = tacho2,
> +		.name = "Fan SYS2",
> +		.fspeed_acpireg = 0,
> +		.visible = false
> +	},
> +};
> +
> +static int imanager2_fan_get_value(struct imanager2 *ec, int index,
> +				   u32 *speed_rpm)
> +{
> +	int ret;
> +	u8 tmp[2];
> +
> +	mutex_lock(&ec->lock);
> +
> +	if (ec->flag & EC_FLAG_MAILBOX)
> +		ret = imanager2_mbox_read_data(ec->flag,
> +					       EC_CMD_MAILBOX_READ_HW_PIN,
> +					       ec_fan_table[index].did, tmp, 2);
> +	else
> +		ret = imanager2_mbox_io_read(EC_CMD_ACPIRAM_READ,
> +					     ec_fan_table[index].fspeed_acpireg,
> +					     tmp, 2);
> +
> +	mutex_unlock(&ec->lock);
> +
> +	if (ret)
> +		return ret;
> +
> +	if (tmp[0] == 0xFF && tmp[1] == 0xFF)
> +		return -ENODEV;

That is a bit late for detecting that there is no such device.

> +
> +	*speed_rpm = (tmp[0] << 8) | tmp[1];
> +
> +	return 0;
> +}
> +
> +#define EC_FANCTROL_SPEEDSRC_MASK	0x30
> +
> +static int imanager2_fan_item_init_by_io(struct imanager2 *ec, int fnum)
> +{
> +	int i, ret;
> +	u8 tmp;
> +
> +	mutex_lock(&ec->lock);
> +	ret = imanager2_mbox_io_read(EC_CMD_HWRAM_READ,
> +				     EC_HWRAM_ADDR_FAN_CONTROL(fnum), &tmp, 1);
> +	mutex_unlock(&ec->lock);
> +
> +	if (ret)
> +		return ret;
> +
> +	i = ((tmp & EC_FANCTROL_SPEEDSRC_MASK) >> 4) - 1;
> +	if (i < 0)
> +		return -ENODEV;
> +

This error return is quite pointless. See below.

> +	/* Unnecessary set again if it has been set. */
> +	if (ec_fan_table[i].visible)
> +		return 0;
> +
> +	ec_fan_table[i].fspeed_acpireg = EC_ACPIRAM_ADDR_FAN_SPEED_BASE(i);
> +	ec_fan_table[i].visible = true;
> +
> +	return 0;
> +}
> +
> +static void imanager2_fan_init(struct imanager2 *ec)
> +{
> +	int i;
> +
> +	if (ec->flag & EC_FLAG_MAILBOX) {
> +		for (i = 0; i < ARRAY_SIZE(ec_fan_table); i++)
> +			ec_fan_table[i].visible =
> +			    ec->table.devid2itemnum[ec_fan_table[i].did] !=
> +			    EC_TABLE_ITEM_UNUSED;
> +	} else {
> +		int fnum;
> +
> +		for (i = 0; i < ARRAY_SIZE(ec_fan_table); i++)
> +			ec_fan_table[i].visible = false;
> +
> +		for (fnum = 0; fnum < EC_MAX_IO_FAN; fnum++) {
> +			if (imanager2_fan_item_init_by_io(ec, fnum))
> +				continue;

This continue is quite pointless.

> +		}
> +	}
> +}
> +
> +static ssize_t show_fan(struct device *dev, struct device_attribute *dev_attr,
> +			char *buf)
> +{
> +	struct imanager2 *ec = dev_get_drvdata(dev);
> +	u32 val;
> +	int ret = imanager2_fan_get_value(ec,
> +					  to_sensor_dev_attr(dev_attr)->index,
> +					  &val);
> +	if (ret)
> +		return ret;
> +
> +	return sprintf(buf, "%u\n", val);
> +}
> +
> +static ssize_t show_fan_label(struct device *dev,
> +			      struct device_attribute *dev_attr, char *buf)
> +{
> +	return sprintf(buf, "%s\n",
> +		       ec_fan_table[to_sensor_dev_attr(dev_attr)->index].name);
> +}
> +
> +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
> +static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
> +static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
> +
> +static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, show_fan_label, NULL, 0);
> +static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, show_fan_label, NULL, 1);
> +static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, show_fan_label, NULL, 2);
> +
> +static struct attribute *imanager2_fan_attrs[] = {
> +	&sensor_dev_attr_fan1_label.dev_attr.attr,
> +	&sensor_dev_attr_fan1_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_fan2_label.dev_attr.attr,
> +	&sensor_dev_attr_fan2_input.dev_attr.attr,
> +
> +	&sensor_dev_attr_fan3_label.dev_attr.attr,
> +	&sensor_dev_attr_fan3_input.dev_attr.attr,
> +
> +	NULL
> +};
> +
> +static umode_t imanager2_fan_mode(struct kobject *kobj, struct attribute *attr,
> +				  int index)
> +{
> +	struct device_attribute *dev_attr;
> +
> +	dev_attr = container_of(attr, struct device_attribute, attr);
> +	if (!ec_fan_table[to_sensor_dev_attr(dev_attr)->index].visible)
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +static const struct attribute_group imanager2_fan_group = {
> +	.attrs = imanager2_fan_attrs,
> +	.is_visible = imanager2_fan_mode,
> +};
> +
> +/* Module */
> +static const struct attribute_group *imanager2_hwmon_groups[] = {
> +	&imanager2_volt_group,
> +	&imanager2_curr_group,
> +	&imanager2_temp_group,
> +	&imanager2_fan_group,
> +	NULL
> +};
> +
> +static int imanager2_hwmon_probe(struct platform_device *pdev)
> +{
> +	struct device *hwmon_dev;
> +	struct imanager2 *hwmon_ec = pdev->dev.parent->platform_data;
> +
> +	imanager2_volt_init(hwmon_ec);
> +	imanager2_curr_init(hwmon_ec);
> +	imanager2_temp_init(hwmon_ec);
> +	imanager2_fan_init(hwmon_ec);
> +
> +	hwmon_dev = devm_hwmon_device_register_with_groups(
> +			&pdev->dev, "imanager2", hwmon_ec,
> +			imanager2_hwmon_groups);
> +
> +	if (IS_ERR(hwmon_dev))
> +		return PTR_ERR(hwmon_dev);
> +
> +	return 0;

	return PTR_ERR_OR_ZERO(hwmon_dev);

> +}
> +
> +static struct platform_driver imanager2_hwmon_driver = {
> +	.probe = imanager2_hwmon_probe,
> +	.driver = {
> +			.owner = THIS_MODULE,
> +			.name = DRV_NAME,
> +	},
> +};
> +
> +module_platform_driver(imanager2_hwmon_driver);
> +
> +MODULE_AUTHOR("Richard Vidal-Dorsch <richard.dorsch at advantech.com>");
> +MODULE_DESCRIPTION("HW Monitoring interface for Advantech EC IT8516/18/28");
> +MODULE_LICENSE("GPL");
> +MODULE_VERSION(DRV_VERSION);
> -- 
> 1.9.1
> 
> 
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