Re: [PATCH] hwmon: Driver for Maxim MAX31790

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On 08/17/2015 04:31 AM, 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     | 556 +++++++++++++++++++++++++++++++++++++++++++
  4 files changed, 604 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..2e50c53
--- /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..7f4c4a1
--- /dev/null
+++ b/drivers/hwmon/max31790.c
@@ -0,0 +1,556 @@
+/*
+ * 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
+
+/* 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 = ((data->fault_status & 0x0FC0)
+				      | (rv & 0x3F));
+
+		rv = i2c_smbus_read_byte_data(client,
+				MAX31790_REG_FAN_FAULT_STATUS2);
+		if (rv < 0)
+			goto abort;
+		data->fault_status = ((data->fault_status & 0x003F)
+				      | ((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;
+
+			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;
+
+			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 = 1;
+	}
+	goto done;
+
+abort:
+	data->valid = 0;
+	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);
+	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));
+	i2c_smbus_write_byte_data(client,
+			MAX31790_REG_FAN_DYNAMICS(attr->index),
+			data->fan_dynamics[attr->index]);
+
+	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;
+
+	i2c_smbus_write_word_swapped(client,
+			MAX31790_REG_TARGET_COUNT(attr->index),
+			data->target_count[attr->index]);
+
+	mutex_unlock(&data->update_lock);
+
+	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;
+	i2c_smbus_write_word_swapped(client,
+			MAX31790_REG_PWMOUT(attr->index),
+			data->pwm[attr->index]);
+
+	mutex_unlock(&data->update_lock);
+
+	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);
+
+	i2c_smbus_write_byte_data(client,
+			MAX31790_REG_FAN_CONFIG(attr->index),
+			data->fan_config[attr->index]);
+
+	mutex_unlock(&data->update_lock);
+
+	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(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(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 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_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 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_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_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,
+
+	&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_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,
+	NULL
+};
+ATTRIBUTE_GROUPS(max31790);
+

The idea here would be to use the is_visible callback to determine if
an attribute should be visible or not. This would apply to the pwm
attributes and to the fan[7-12] attributes. Essentially, depending
on the chip  configuration, either the fan attributes or the pwm
attributes should be visible for a given fan/pwm control, but not both.

Example: Either pwm1, pwm1_enable, and fan1_target, or fan7_input and
fan7_fault, but not both.

Thanks,
Guenter


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