Re: [PATCH] hwmon: Driver for Maxim MAX31790

[Guenter Roeck <linux@xxxxxxxxxxxx>]

On 08/24/2015 10:52 PM, Il Han wrote:
> The driver supports the Maxim MAX31790.
>
> Signed-off-by: Il Han <corone.il.han@xxxxxxxxx>
> ---
>   Documentation/hwmon/max31790 |  37 +++
>   drivers/hwmon/Kconfig        |  10 +
>   drivers/hwmon/Makefile       |   1 +
>   drivers/hwmon/max31790.c     | 603 +++++++++++++++++++++++++++++++++++++++++++
>   4 files changed, 651 insertions(+)
>   create mode 100644 Documentation/hwmon/max31790
>   create mode 100644 drivers/hwmon/max31790.c
>
> diff --git a/Documentation/hwmon/max31790 b/Documentation/hwmon/max31790
> new file mode 100644
> index 0000000..855e624
> --- /dev/null
> +++ b/Documentation/hwmon/max31790
> @@ -0,0 +1,37 @@
> +Kernel driver max31790
> +======================
> +
> +Supported chips:
> +  * Maxim MAX31790
> +    Prefix: 'max31790'
> +    Addresses scanned: -
> +    Datasheet: http://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
> +
> +Author: Il Han <corone.il.han@xxxxxxxxx>
> +
> +
> +Description
> +-----------
> +
> +This driver implements support for the Maxim MAX31790 chip.
> +
> +The MAX31790 controls the speeds of up to six fans using six independent
> +PWM outputs. The desired fan speeds (or PWM duty cycles) are written
> +through the I2C interface. The outputs drive "4-wire" fans directly,
> +or can be used to modulate the fan's power terminals using an external
> +pass transistor.
> +
> +Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
> +monitoring and control of fan RPM as well as detection of fan failure.
> +Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
> +also be configured to serve as tachometer inputs.
> +
> +
> +Sysfs entries
> +-------------
> +
> +fan[1-12]_input    RO  fan tachometer speed in RPM
> +fan[1-12]_fault    RO  fan experienced fault
> +fan[1-6]_target    RW  desired fan speed in RPM
> +pwm[1-6]_enable    RW  regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
> +pwm[1-6]           RW  fan target duty cycle (0-255)
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 7c65b73..39775f9 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -840,6 +840,16 @@ config SENSORS_MAX6697
>   	  This driver can also be built as a module.  If so, the module
>   	  will be called max6697.
>
> +config SENSORS_MAX31790
> +	tristate "Maxim MAX31790 sensor chip"
> +	depends on I2C
> +	help
> +	  If you say yes here you get support for 6-Channel PWM-Output
> +	  Fan RPM Controller.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called max31790.
> +
>   config SENSORS_HTU21
>   	tristate "Measurement Specialties HTU21D humidity/temperature sensors"
>   	depends on I2C
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 9e0f3dd..01855ee 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -115,6 +115,7 @@ obj-$(CONFIG_SENSORS_MAX6639)	+= max6639.o
>   obj-$(CONFIG_SENSORS_MAX6642)	+= max6642.o
>   obj-$(CONFIG_SENSORS_MAX6650)	+= max6650.o
>   obj-$(CONFIG_SENSORS_MAX6697)	+= max6697.o
> +obj-$(CONFIG_SENSORS_MAX31790)	+= max31790.o
>   obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
>   obj-$(CONFIG_SENSORS_MCP3021)	+= mcp3021.o
>   obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
> diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
> new file mode 100644
> index 0000000..d9b0003
> --- /dev/null
> +++ b/drivers/hwmon/max31790.c
> @@ -0,0 +1,603 @@
> +/*
> + * max31790.c - Part of lm_sensors, Linux kernel modules for hardware
> + *             monitoring.
> + *
> + * (C) 2015 by Il Han <corone.il.han@xxxxxxxxx>
> + *
> + * 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 2 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.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/jiffies.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +
> +/* MAX31790 registers */
> +#define MAX31790_REG_GLOBAL_CONFIG	0x00
> +#define MAX31790_REG_FAN_CONFIG(ch)	(0x02 + (ch))
> +#define MAX31790_REG_FAN_DYNAMICS(ch)	(0x08 + (ch))
> +#define MAX31790_REG_FAN_FAULT_STATUS2	0x10
> +#define MAX31790_REG_FAN_FAULT_STATUS1	0x11
> +#define MAX31790_REG_TACH_COUNT(ch)	(0x18 + (ch) * 2)
> +#define MAX31790_REG_PWM_DUTY_CYCLE(ch)	(0x30 + (ch) * 2)
> +#define MAX31790_REG_PWMOUT(ch)		(0x40 + (ch) * 2)
> +#define MAX31790_REG_TARGET_COUNT(ch)	(0x50 + (ch) * 2)
> +
> +/* Fan Config register bits */
> +#define MAX31790_FAN_CFG_RPM_MODE	0x80
> +#define MAX31790_FAN_CFG_TACH_INPUT_EN	0x08
> +#define MAX31790_FAN_CFG_TACH_INPUT	0x01
> +
> +/* Fan Dynamics register bits */
> +#define MAX31790_FAN_DYN_SR_SHIFT	5
> +#define MAX31790_FAN_DYN_SR_MASK	0xE0
> +#define SR_FROM_REG(reg)		(((reg) & MAX31790_FAN_DYN_SR_MASK) \
> +					 >> MAX31790_FAN_DYN_SR_SHIFT)
> +
> +#define FAN_RPM_MIN			120
> +#define FAN_RPM_MAX			7864320
> +
> +#define RPM_FROM_REG(reg, sr)		(((reg) >> 4) ? \
> +					 ((60 * (sr) * 8192) / ((reg) >> 4)) : \
> +					 FAN_RPM_MAX)
> +#define RPM_TO_REG(rpm, sr)		((60 * (sr) * 8192) / ((rpm) * 2))
> +
> +#define NR_CHANNEL			6
> +
> +/*
> + * Client data (each client gets its own)
> + */
> +struct max31790_data {
> +	struct i2c_client *client;
> +	struct mutex update_lock;
> +	bool valid; /* zero until following fields are valid */
> +	unsigned long last_updated; /* in jiffies */
> +
> +	/* register values */
> +	u8 fan_config[NR_CHANNEL];
> +	u8 fan_dynamics[NR_CHANNEL];
> +	u16 fault_status;
> +	u16 tach[NR_CHANNEL * 2];
> +	u16 pwm[NR_CHANNEL];
> +	u16 target_count[NR_CHANNEL];
> +};
> +
> +static struct max31790_data *max31790_update_device(struct device *dev)
> +{
> +	struct max31790_data *data = dev_get_drvdata(dev);
> +	struct i2c_client *client = data->client;
> +	struct max31790_data *ret = data;
> +	int i;
> +	int rv;
> +
> +	mutex_lock(&data->update_lock);
> +
> +	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
> +		rv = i2c_smbus_read_byte_data(client,
> +				MAX31790_REG_FAN_FAULT_STATUS1);
> +		if (rv < 0)
> +			goto abort;
> +		data->fault_status = rv & 0x3F;
> +
> +		rv = i2c_smbus_read_byte_data(client,
> +				MAX31790_REG_FAN_FAULT_STATUS2);
> +		if (rv < 0)
> +			goto abort;
> +		data->fault_status |= (rv & 0x3F) << 6;
> +
> +		for (i = 0; i < NR_CHANNEL; i++) {
> +			rv = i2c_smbus_read_word_swapped(client,
> +					MAX31790_REG_TACH_COUNT(i));
> +			if (rv < 0)
> +				goto abort;
> +			data->tach[i] = rv;
> +
> +			if (data->fan_config[i]
> +			    & MAX31790_FAN_CFG_TACH_INPUT) {
> +				rv = i2c_smbus_read_word_swapped(client,
> +					MAX31790_REG_TACH_COUNT(NR_CHANNEL
> +								+ i));
> +				if (rv < 0)
> +					goto abort;
> +				data->tach[NR_CHANNEL + i] = rv;
> +			} else {
> +				rv = i2c_smbus_read_word_swapped(client,
> +						MAX31790_REG_PWMOUT(i));
> +				if (rv < 0)
> +					goto abort;
> +				data->pwm[i] = rv;
> +
> +				rv = i2c_smbus_read_word_swapped(client,
> +						MAX31790_REG_TARGET_COUNT(i));
> +				if (rv < 0)
> +					goto abort;
> +				data->target_count[i] = rv;
> +			}
> +		}
> +
> +		data->last_updated = jiffies;
> +		data->valid = true;
> +	}
> +	goto done;
> +
> +abort:
> +	data->valid = false;
> +	ret = ERR_PTR(rv);
> +
> +done:
> +	mutex_unlock(&data->update_lock);
> +
> +	return ret;
> +}
> +
> +static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
> +
> +static u8 get_tach_period(u8 fan_dynamics)
> +{
> +	return tach_period[SR_FROM_REG(fan_dynamics)];
> +}
> +
> +static u8 bits_for_tach_period(int rpm)
> +{
> +	u8 bits;
> +
> +	if (rpm < 500)
> +		bits = 0x0;
> +	else if (rpm < 1000)
> +		bits = 0x1;
> +	else if (rpm < 2000)
> +		bits = 0x2;
> +	else if (rpm < 4000)
> +		bits = 0x3;
> +	else if (rpm < 8000)
> +		bits = 0x4;
> +	else
> +		bits = 0x5;
> +
> +	return bits;
> +}
> +
> +static ssize_t get_fan(struct device *dev,
> +		       struct device_attribute *devattr, char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct max31790_data *data = max31790_update_device(dev);
> +	int sr = get_tach_period(data->fan_dynamics[attr->index]);
> +	int rpm;
> +
> +	if (IS_ERR(data))
> +		return PTR_ERR(data);
> +
> +	rpm = RPM_FROM_REG(data->tach[attr->index], sr);
> +
> +	return sprintf(buf, "%d\n", rpm);
> +}
> +
> +static ssize_t get_fan_target(struct device *dev,
> +			      struct device_attribute *devattr, char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct max31790_data *data = max31790_update_device(dev);
> +	int sr = get_tach_period(data->fan_dynamics[attr->index]);
> +	int rpm;
> +
> +	if (IS_ERR(data))
> +		return PTR_ERR(data);
> +
> +	rpm = RPM_FROM_REG(data->target_count[attr->index], sr);
> +
> +	return sprintf(buf, "%d\n", rpm);
> +}
> +
> +static ssize_t set_fan_target(struct device *dev,
> +			      struct device_attribute *devattr,
> +			      const char *buf, size_t count)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct max31790_data *data = i2c_get_clientdata(client);

Did you test those set functions ?

This should be

	struct max31790_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

The above code crashes, since dev is not an i2c client device.

Guenter

> +	u8 bits;
> +	int sr;
> +	int target_count;
> +	unsigned long rpm;
> +	int err;
> +
> +	err = kstrtoul(buf, 10, &rpm);
> +	if (err)
> +		return err;
> +
> +	mutex_lock(&data->update_lock);
> +
> +	rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
> +	bits = bits_for_tach_period(rpm);
> +	data->fan_dynamics[attr->index] =
> +			((data->fan_dynamics[attr->index]
> +			  & ~MAX31790_FAN_DYN_SR_MASK)
> +			 | (bits << MAX31790_FAN_DYN_SR_SHIFT));
> +	err = i2c_smbus_write_byte_data(client,
> +			MAX31790_REG_FAN_DYNAMICS(attr->index),
> +			data->fan_dynamics[attr->index]);
> +
> +	if (err < 0) {
> +		mutex_unlock(&data->update_lock);
> +		return err;
> +	}
> +
> +	sr = get_tach_period(data->fan_dynamics[attr->index]);
> +	target_count = RPM_TO_REG(rpm, sr);
> +	target_count = clamp_val(target_count, 0x1, 0x7FF);
> +
> +	data->target_count[attr->index] = target_count << 5;
> +
> +	err = i2c_smbus_write_word_swapped(client,
> +			MAX31790_REG_TARGET_COUNT(attr->index),
> +			data->target_count[attr->index]);
> +
> +	mutex_unlock(&data->update_lock);
> +
> +	if (err < 0)
> +		return err;
> +
> +	return count;
> +}
> +
> +static ssize_t get_pwm(struct device *dev,
> +		       struct device_attribute *devattr, char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct max31790_data *data = max31790_update_device(dev);
> +	int pwm;
> +
> +	if (IS_ERR(data))
> +		return PTR_ERR(data);
> +
> +	pwm = data->pwm[attr->index] >> 8;
> +
> +	return sprintf(buf, "%d\n", pwm);
> +}
> +
> +static ssize_t set_pwm(struct device *dev,
> +		       struct device_attribute *devattr,
> +		       const char *buf, size_t count)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct max31790_data *data = i2c_get_clientdata(client);
> +	unsigned long pwm;
> +	int err;
> +
> +	err = kstrtoul(buf, 10, &pwm);
> +	if (err)
> +		return err;
> +
> +	if (pwm > 255)
> +		return -EINVAL;
> +
> +	mutex_lock(&data->update_lock);
> +
> +	data->pwm[attr->index] = pwm << 8;
> +	err = i2c_smbus_write_word_swapped(client,
> +			MAX31790_REG_PWMOUT(attr->index),
> +			data->pwm[attr->index]);
> +
> +	mutex_unlock(&data->update_lock);
> +
> +	if (err < 0)
> +		return err;
> +
> +	return count;
> +}
> +
> +static ssize_t get_pwm_enable(struct device *dev,
> +			      struct device_attribute *devattr, char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct max31790_data *data = max31790_update_device(dev);
> +	int mode;
> +
> +	if (IS_ERR(data))
> +		return PTR_ERR(data);
> +
> +	if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE)
> +		mode = 2;
> +	else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN)
> +		mode = 1;
> +	else
> +		mode = 0;
> +
> +	return sprintf(buf, "%d\n", mode);
> +}
> +
> +static ssize_t set_pwm_enable(struct device *dev,
> +			      struct device_attribute *devattr,
> +			      const char *buf, size_t count)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct max31790_data *data = i2c_get_clientdata(client);
> +	unsigned long mode;
> +	int err;
> +
> +	err = kstrtoul(buf, 10, &mode);
> +	if (err)
> +		return err;
> +
> +	switch (mode) {
> +	case 0:
> +		data->fan_config[attr->index] =
> +			data->fan_config[attr->index]
> +			& ~(MAX31790_FAN_CFG_TACH_INPUT_EN
> +			    | MAX31790_FAN_CFG_RPM_MODE);
> +		break;
> +	case 1:
> +		data->fan_config[attr->index] =
> +			(data->fan_config[attr->index]
> +			 | MAX31790_FAN_CFG_TACH_INPUT_EN)
> +			& ~MAX31790_FAN_CFG_RPM_MODE;
> +		break;
> +	case 2:
> +		data->fan_config[attr->index] =
> +			data->fan_config[attr->index]
> +			| MAX31790_FAN_CFG_TACH_INPUT_EN
> +			| MAX31790_FAN_CFG_RPM_MODE;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	mutex_lock(&data->update_lock);
> +
> +	err = i2c_smbus_write_byte_data(client,
> +			MAX31790_REG_FAN_CONFIG(attr->index),
> +			data->fan_config[attr->index]);
> +
> +	mutex_unlock(&data->update_lock);
> +
> +	if (err < 0)
> +		return err;
> +
> +	return count;
> +}
> +
> +static ssize_t get_fan_fault(struct device *dev,
> +			     struct device_attribute *devattr, char *buf)
> +{
> +	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +	struct max31790_data *data = max31790_update_device(dev);
> +	int fault;
> +
> +	if (IS_ERR(data))
> +		return PTR_ERR(data);
> +
> +	fault = !!(data->fault_status & (1 << attr->index));
> +
> +	return sprintf(buf, "%d\n", fault);
> +}
> +
> +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
> +static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
> +static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
> +static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
> +static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4);
> +static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5);
> +
> +static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0);
> +static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1);
> +static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2);
> +static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3);
> +static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4);
> +static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5);
> +
> +static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, get_fan, NULL, 6);
> +static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, get_fan, NULL, 7);
> +static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, get_fan, NULL, 8);
> +static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, get_fan, NULL, 9);
> +static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, get_fan, NULL, 10);
> +static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, get_fan, NULL, 11);
> +
> +static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, get_fan_fault, NULL, 6);
> +static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, get_fan_fault, NULL, 7);
> +static SENSOR_DEVICE_ATTR(fan9_fault, S_IRUGO, get_fan_fault, NULL, 8);
> +static SENSOR_DEVICE_ATTR(fan10_fault, S_IRUGO, get_fan_fault, NULL, 9);
> +static SENSOR_DEVICE_ATTR(fan11_fault, S_IRUGO, get_fan_fault, NULL, 10);
> +static SENSOR_DEVICE_ATTR(fan12_fault, S_IRUGO, get_fan_fault, NULL, 11);
> +
> +static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO,
> +		get_fan_target, set_fan_target, 0);
> +static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO,
> +		get_fan_target, set_fan_target, 1);
> +static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO,
> +		get_fan_target, set_fan_target, 2);
> +static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO,
> +		get_fan_target, set_fan_target, 3);
> +static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO,
> +		get_fan_target, set_fan_target, 4);
> +static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO,
> +		get_fan_target, set_fan_target, 5);
> +
> +static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0);
> +static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1);
> +static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2);
> +static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3);
> +static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4);
> +static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5);
> +
> +static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
> +		get_pwm_enable, set_pwm_enable, 0);
> +static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
> +		get_pwm_enable, set_pwm_enable, 1);
> +static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
> +		get_pwm_enable, set_pwm_enable, 2);
> +static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO,
> +		get_pwm_enable, set_pwm_enable, 3);
> +static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO,
> +		get_pwm_enable, set_pwm_enable, 4);
> +static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO,
> +		get_pwm_enable, set_pwm_enable, 5);
> +
> +static struct attribute *max31790_attrs[] = {
> +	&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_fan1_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan2_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan3_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan4_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan5_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan6_fault.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_fan7_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan8_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan9_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan10_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan11_fault.dev_attr.attr,
> +	&sensor_dev_attr_fan12_fault.dev_attr.attr,
> +
> +	&sensor_dev_attr_fan1_target.dev_attr.attr,
> +	&sensor_dev_attr_fan2_target.dev_attr.attr,
> +	&sensor_dev_attr_fan3_target.dev_attr.attr,
> +	&sensor_dev_attr_fan4_target.dev_attr.attr,
> +	&sensor_dev_attr_fan5_target.dev_attr.attr,
> +	&sensor_dev_attr_fan6_target.dev_attr.attr,
> +
> +	&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_pwm1_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm4_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm5_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm6_enable.dev_attr.attr,
> +	NULL
> +};
> +
> +static umode_t max31790_attrs_visible(struct kobject *kobj,
> +				     struct attribute *a, int n)
> +{
> +	struct device *dev = container_of(kobj, struct device, kobj);
> +	struct max31790_data *data = dev_get_drvdata(dev);
> +	struct device_attribute *devattr =
> +			container_of(a, struct device_attribute, attr);
> +	int index = to_sensor_dev_attr(devattr)->index % NR_CHANNEL;
> +	u8 fan_config;
> +
> +	fan_config = data->fan_config[index];
> +
> +	if (n >= NR_CHANNEL * 2 && n < NR_CHANNEL * 4 &&
> +	    !(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
> +		return 0;
> +	if (n >= NR_CHANNEL * 4 && (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
> +		return 0;
> +
> +	return a->mode;
> +}
> +
> +static const struct attribute_group max31790_group = {
> +	.attrs = max31790_attrs,
> +	.is_visible = max31790_attrs_visible,
> +};
> +__ATTRIBUTE_GROUPS(max31790);
> +
> +static int max31790_init_client(struct i2c_client *client,
> +				struct max31790_data *data)
> +{
> +	int i, rv;
> +
> +	for (i = 0; i < NR_CHANNEL; i++) {
> +		rv = i2c_smbus_read_byte_data(client,
> +				MAX31790_REG_FAN_CONFIG(i));
> +		if (rv < 0)
> +			return rv;
> +		data->fan_config[i] = rv;
> +
> +		rv = i2c_smbus_read_byte_data(client,
> +				MAX31790_REG_FAN_DYNAMICS(i));
> +		if (rv < 0)
> +			return rv;
> +		data->fan_dynamics[i] = rv;
> +	}
> +
> +	return 0;
> +}
> +
> +static int max31790_probe(struct i2c_client *client,
> +			  const struct i2c_device_id *id)
> +{
> +	struct i2c_adapter *adapter = client->adapter;
> +	struct device *dev = &client->dev;
> +	struct max31790_data *data;
> +	struct device *hwmon_dev;
> +	int err;
> +
> +	if (!i2c_check_functionality(adapter,
> +			I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
> +		return -ENODEV;
> +
> +	data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->client = client;
> +	mutex_init(&data->update_lock);
> +
> +	/*
> +	 * Initialize the max31790 chip
> +	 */
> +	err = max31790_init_client(client, data);
> +	if (err)
> +		return err;
> +
> +	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
> +			client->name, data, max31790_groups);
> +
> +	return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct i2c_device_id max31790_id[] = {
> +	{ "max31790", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, max31790_id);
> +
> +static struct i2c_driver max31790_driver = {
> +	.class		= I2C_CLASS_HWMON,
> +	.probe		= max31790_probe,
> +	.driver = {
> +		.name	= "max31790",
> +	},
> +	.id_table	= max31790_id,
> +};
> +
> +module_i2c_driver(max31790_driver);
> +
> +MODULE_AUTHOR("Il Han <corone.il.han@xxxxxxxxx>");
> +MODULE_DESCRIPTION("MAX31790 sensor driver");
> +MODULE_LICENSE("GPL");


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