Add support for the 6 temperature monitoring channels of the PC87427.
Note that the sensors resolution can vary, and I couldn't find a way
to figure it out, so we might have to compensate in user-space.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
---
Documentation/hwmon/pc87427 | 14 +
drivers/hwmon/Kconfig | 4
drivers/hwmon/pc87427.c | 368 ++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 379 insertions(+), 7 deletions(-)
--- linux-2.6.36-rc0.orig/drivers/hwmon/pc87427.c 2010-08-11 16:35:46.000000000 +0200
+++ linux-2.6.36-rc0/drivers/hwmon/pc87427.c 2010-08-11 16:39:37.000000000 +0200
@@ -1,7 +1,7 @@
/*
* pc87427.c - hardware monitoring driver for the
* National Semiconductor PC87427 Super-I/O chip
- * Copyright (C) 2006, 2008 Jean Delvare <khali@xxxxxxxxxxxx>
+ * Copyright (C) 2006, 2008, 2010 Jean Delvare <khali@xxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -15,10 +15,11 @@
* Supports the following chips:
*
* Chip #vin #fan #pwm #temp devid
- * PC87427 - 8 4 - 0xF2
+ * PC87427 - 8 4 6 0xF2
*
* This driver assumes that no more than one chip is present.
- * Only fans are supported so far, although the chip can do much more.
+ * Only fans are fully supported so far. Temperatures are in read-only
+ * mode, and voltages aren't supported at all.
*/
#include <linux/module.h>
@@ -62,6 +63,14 @@ struct pc87427_data {
u8 pwm_auto_ok; /* bit vector */
u8 pwm_enable[4]; /* register values */
u8 pwm[4]; /* register values */
+
+ u8 temp_enabled; /* bit vector */
+ s16 temp[6]; /* register values */
+ s8 temp_min[6]; /* register values */
+ s8 temp_max[6]; /* register values */
+ s8 temp_crit[6]; /* register values */
+ u8 temp_status[6]; /* register values */
+ u8 temp_type[6]; /* register values */
};
struct pc87427_sio_data {
@@ -120,6 +129,8 @@ static inline void superio_exit(int sioa
#define BANK_FM(nr) (nr)
#define BANK_FT(nr) (0x08 + (nr))
#define BANK_FC(nr) (0x10 + (nr) * 2)
+#define BANK_TM(nr) (nr)
+#define BANK_VM(nr) (0x08 + (nr))
/*
* I/O access functions
@@ -252,6 +263,72 @@ static inline u8 pwm_enable_to_reg(unsig
}
/*
+ * Temperature registers and conversions
+ */
+
+#define PC87427_REG_TEMP_STATUS 0x10
+#define PC87427_REG_TEMP 0x14
+#define PC87427_REG_TEMP_MAX 0x18
+#define PC87427_REG_TEMP_MIN 0x19
+#define PC87427_REG_TEMP_CRIT 0x1a
+#define PC87427_REG_TEMP_TYPE 0x1d
+
+#define TEMP_STATUS_CHANEN (1 << 0)
+#define TEMP_STATUS_LOWFLG (1 << 1)
+#define TEMP_STATUS_HIGHFLG (1 << 2)
+#define TEMP_STATUS_CRITFLG (1 << 3)
+#define TEMP_STATUS_SENSERR (1 << 5)
+#define TEMP_TYPE_MASK (3 << 5)
+
+#define TEMP_TYPE_THERMISTOR (1 << 5)
+#define TEMP_TYPE_REMOTE_DIODE (2 << 5)
+#define TEMP_TYPE_LOCAL_DIODE (3 << 5)
+
+/* Dedicated function to read all registers related to a given temperature
+ input. This saves us quite a few locks and bank selections.
+ Must be called with data->lock held.
+ nr is from 0 to 5 */
+static void pc87427_readall_temp(struct pc87427_data *data, u8 nr)
+{
+ int iobase = data->address[LD_TEMP];
+
+ outb(BANK_TM(nr), iobase + PC87427_REG_BANK);
+ data->temp[nr] = le16_to_cpu(inw(iobase + PC87427_REG_TEMP));
+ data->temp_max[nr] = inb(iobase + PC87427_REG_TEMP_MAX);
+ data->temp_min[nr] = inb(iobase + PC87427_REG_TEMP_MIN);
+ data->temp_crit[nr] = inb(iobase + PC87427_REG_TEMP_CRIT);
+ data->temp_type[nr] = inb(iobase + PC87427_REG_TEMP_TYPE);
+ data->temp_status[nr] = inb(iobase + PC87427_REG_TEMP_STATUS);
+ /* Clear fan alarm bits */
+ outb(data->temp_status[nr], iobase + PC87427_REG_TEMP_STATUS);
+}
+
+static inline unsigned int temp_type_from_reg(u8 reg)
+{
+ switch (reg & TEMP_TYPE_MASK) {
+ case TEMP_TYPE_THERMISTOR:
+ return 4;
+ case TEMP_TYPE_REMOTE_DIODE:
+ case TEMP_TYPE_LOCAL_DIODE:
+ return 3;
+ default:
+ return 0;
+ }
+}
+
+/* We assume 8-bit thermal sensors; 9-bit thermal sensors are possible
+ too, but I have no idea how to figure out when they are used. */
+static inline long temp_from_reg(s16 reg)
+{
+ return reg * 1000 / 256;
+}
+
+static inline long temp_from_reg8(s8 reg)
+{
+ return reg * 1000;
+}
+
+/*
* Data interface
*/
@@ -279,6 +356,13 @@ static struct pc87427_data *pc87427_upda
pc87427_readall_pwm(data, i);
}
+ /* Temperature channels */
+ for (i = 0; i < 6; i++) {
+ if (!(data->temp_enabled & (1 << i)))
+ continue;
+ pc87427_readall_temp(data, i);
+ }
+
data->last_updated = jiffies;
done:
@@ -595,6 +679,251 @@ static const struct attribute_group pc87
{ .attrs = pc87427_attributes_pwm[3] },
};
+static ssize_t show_temp_input(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%ld\n", temp_from_reg(data->temp[nr]));
+}
+
+static ssize_t show_temp_min(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_min[nr]));
+}
+
+static ssize_t show_temp_max(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_max[nr]));
+}
+
+static ssize_t show_temp_crit(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%ld\n", temp_from_reg8(data->temp_crit[nr]));
+}
+
+static ssize_t show_temp_type(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%u\n", temp_type_from_reg(data->temp_type[nr]));
+}
+
+static ssize_t show_temp_min_alarm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%d\n", !!(data->temp_status[nr]
+ & TEMP_STATUS_LOWFLG));
+}
+
+static ssize_t show_temp_max_alarm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%d\n", !!(data->temp_status[nr]
+ & TEMP_STATUS_HIGHFLG));
+}
+
+static ssize_t show_temp_crit_alarm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%d\n", !!(data->temp_status[nr]
+ & TEMP_STATUS_CRITFLG));
+}
+
+static ssize_t show_temp_fault(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pc87427_data *data = pc87427_update_device(dev);
+ int nr = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%d\n", !!(data->temp_status[nr]
+ & TEMP_STATUS_SENSERR));
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_min, S_IRUGO, show_temp_min, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, show_temp_type, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO, show_temp_type, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO, show_temp_type, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_type, S_IRUGO, show_temp_type, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_type, S_IRUGO, show_temp_type, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_type, S_IRUGO, show_temp_type, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
+ show_temp_min_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
+ show_temp_min_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO,
+ show_temp_min_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO,
+ show_temp_min_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO,
+ show_temp_min_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_min_alarm, S_IRUGO,
+ show_temp_min_alarm, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
+ show_temp_max_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
+ show_temp_max_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO,
+ show_temp_max_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO,
+ show_temp_max_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO,
+ show_temp_max_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO,
+ show_temp_max_alarm, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
+ show_temp_crit_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
+ show_temp_crit_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO,
+ show_temp_crit_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO,
+ show_temp_crit_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO,
+ show_temp_crit_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO,
+ show_temp_crit_alarm, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
+
+static struct attribute *pc87427_attributes_temp[6][10] = {
+ {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_type.dev_attr.attr,
+ &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_fault.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit.dev_attr.attr,
+ &sensor_dev_attr_temp2_type.dev_attr.attr,
+ &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_fault.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_min.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_crit.dev_attr.attr,
+ &sensor_dev_attr_temp3_type.dev_attr.attr,
+ &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_fault.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ &sensor_dev_attr_temp4_min.dev_attr.attr,
+ &sensor_dev_attr_temp4_max.dev_attr.attr,
+ &sensor_dev_attr_temp4_crit.dev_attr.attr,
+ &sensor_dev_attr_temp4_type.dev_attr.attr,
+ &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_fault.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_temp5_input.dev_attr.attr,
+ &sensor_dev_attr_temp5_min.dev_attr.attr,
+ &sensor_dev_attr_temp5_max.dev_attr.attr,
+ &sensor_dev_attr_temp5_crit.dev_attr.attr,
+ &sensor_dev_attr_temp5_type.dev_attr.attr,
+ &sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_fault.dev_attr.attr,
+ NULL
+ }, {
+ &sensor_dev_attr_temp6_input.dev_attr.attr,
+ &sensor_dev_attr_temp6_min.dev_attr.attr,
+ &sensor_dev_attr_temp6_max.dev_attr.attr,
+ &sensor_dev_attr_temp6_crit.dev_attr.attr,
+ &sensor_dev_attr_temp6_type.dev_attr.attr,
+ &sensor_dev_attr_temp6_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp6_fault.dev_attr.attr,
+ NULL
+ }
+};
+
+static const struct attribute_group pc87427_group_temp[6] = {
+ { .attrs = pc87427_attributes_temp[0] },
+ { .attrs = pc87427_attributes_temp[1] },
+ { .attrs = pc87427_attributes_temp[2] },
+ { .attrs = pc87427_attributes_temp[3] },
+ { .attrs = pc87427_attributes_temp[4] },
+ { .attrs = pc87427_attributes_temp[5] },
+};
+
static ssize_t show_name(struct device *dev, struct device_attribute
*devattr, char *buf)
{
@@ -659,7 +988,7 @@ static void __devinit pc87427_init_devic
/* The FMC module should be ready */
reg = pc87427_read8(data, LD_FAN, PC87427_REG_BANK);
if (!(reg & 0x80))
- dev_warn(dev, "FMC module not ready!\n");
+ dev_warn(dev, "%s module not ready!\n", "FMC");
/* Check which fans are enabled */
for (i = 0; i < 8; i++) {
@@ -701,6 +1030,19 @@ static void __devinit pc87427_init_devic
data->pwm_auto_ok |= (1 << i);
}
}
+
+ /* The HMC module should be ready */
+ reg = pc87427_read8(data, LD_TEMP, PC87427_REG_BANK);
+ if (!(reg & 0x80))
+ dev_warn(dev, "%s module not ready!\n", "HMC");
+
+ /* Check which temperature channels are enabled */
+ for (i = 0; i < 6; i++) {
+ reg = pc87427_read8_bank(data, LD_TEMP, BANK_TM(i),
+ PC87427_REG_TEMP_STATUS);
+ if (reg & TEMP_STATUS_CHANEN)
+ data->temp_enabled |= (1 << i);
+ }
}
static int __devinit pc87427_probe(struct platform_device *pdev)
@@ -749,6 +1091,14 @@ static int __devinit pc87427_probe(struc
if (err)
goto exit_remove_files;
}
+ for (i = 0; i < 6; i++) {
+ if (!(data->temp_enabled & (1 << i)))
+ continue;
+ err = sysfs_create_group(&pdev->dev.kobj,
+ &pc87427_group_temp[i]);
+ if (err)
+ goto exit_remove_files;
+ }
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -770,6 +1120,11 @@ exit_remove_files:
continue;
sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]);
}
+ for (i = 0; i < 6; i++) {
+ if (!(data->temp_enabled & (1 << i)))
+ continue;
+ sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_temp[i]);
+ }
exit_release_region:
pc87427_release_regions(pdev, res_count);
exit_kfree:
@@ -798,6 +1153,11 @@ static int __devexit pc87427_remove(stru
continue;
sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]);
}
+ for (i = 0; i < 6; i++) {
+ if (!(data->temp_enabled & (1 << i)))
+ continue;
+ sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_temp[i]);
+ }
platform_set_drvdata(pdev, NULL);
kfree(data);
--- linux-2.6.36-rc0.orig/drivers/hwmon/Kconfig 2010-08-11 16:27:12.000000000 +0200
+++ linux-2.6.36-rc0/drivers/hwmon/Kconfig 2010-08-11 16:39:37.000000000 +0200
@@ -711,8 +711,8 @@ config SENSORS_PC87427
functions of the National Semiconductor PC87427 Super-I/O chip.
The chip has two distinct logical devices, one for fan speed
monitoring and control, and one for voltage and temperature
- monitoring. Only fan speed monitoring and control is supported
- right now.
+ monitoring. Fan speed monitoring and control are supported, as
+ well as temperature monitoring. Voltages aren't supported yet.
This driver can also be built as a module. If so, the module
will be called pc87427.
--- linux-2.6.36-rc0.orig/Documentation/hwmon/pc87427 2010-08-11 16:27:12.000000000 +0200
+++ linux-2.6.36-rc0/Documentation/hwmon/pc87427 2010-08-11 16:39:37.000000000 +0200
@@ -18,7 +18,8 @@ Description
The National Semiconductor Super I/O chip includes complete hardware
monitoring capabilities. It can monitor up to 18 voltages, 8 fans and
-6 temperature sensors. Only the fans are supported at the moment.
+6 temperature sensors. Only the fans and temperatures are supported at
+the moment, voltages aren't.
This chip also has fan controlling features (up to 4 PWM outputs),
which are partly supported by this driver.
@@ -45,3 +46,14 @@ Fan speed can be controlled by PWM outpu
always off, always on, manual and automatic. The latter isn't supported
by the driver: you can only return to that mode if it was the original
setting, and the configuration interface is missing.
+
+
+Temperature Monitoring
+----------------------
+
+The PC87427 relies on external sensors (following the SensorPath
+standard), so the resolution and range depend on the type of sensor
+connected. The integer part can be 8-bit or 9-bit, and can be signed or
+not. I couldn't find a way to figure out the external sensor data
+temperature format, so user-space adjustment (typically by a factor 2)
+may be required.
--
Jean Delvare
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