hwmon: (pc87427) Add temperature monitoring support

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@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>

1 files changed, 364 insertions, 4 deletions

diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c
index 129a33ce3fe4..189dad428ac2 100644
--- a/drivers/hwmon/pc87427.c
+++ b/drivers/hwmon/pc87427.c
@@ -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@linux-fr.org>
+ *  Copyright (C) 2006, 2008, 2010  Jean Delvare <khali@linux-fr.org>
  *
  *  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 sioaddr)
 #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(unsigned long val, u8 pwmval)
 }
 
 /*
+ * 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_update_device(struct device *dev)
 		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 pc87427_group_pwm[4] = {
 	{ .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_device(struct device *dev)
 	/* 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_device(struct device *dev)
 			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(struct platform_device *pdev)
 		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(struct platform_device *pdev)
 			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);