thermal: fix generic thermal I/F for hwmon

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

Documentation/thermal/sysfs-api.txt

@@ -143,10 +143,10 @@ type				Strings which represent the thermal zone type.
 				This is given by thermal zone driver as part of registration.
 				Eg: "ACPI thermal zone" indicates it's a ACPI thermal device
 				RO
-				Optional
+				Required
 
 temp				Current temperature as reported by thermal zone (sensor)
-				Unit: degree Celsius
+				Unit: millidegree Celsius
 				RO
 				Required
 
@@ -163,7 +163,7 @@ mode				One of the predefined values in [kernel, user]
 					  charge of the thermal management.
 
 trip_point_[0-*]_temp		The temperature above which trip point will be fired
-				Unit: degree Celsius
+				Unit: millidegree Celsius
 				RO
 				Optional
 
@@ -193,7 +193,7 @@ type				String which represents the type of device
 				eg. For memory controller device on intel_menlow platform:
 				this should be "Memory controller"
 				RO
-				Optional
+				Required
 
 max_state			The maximum permissible cooling state of this cooling device.
 				RO
@@ -219,16 +219,16 @@ the sys I/F structure will be built like this:
 
 |thermal_zone1:
 	|-----type:			ACPI thermal zone
-	|-----temp:			37
+	|-----temp:			37000
 	|-----mode:			kernel
-	|-----trip_point_0_temp:	100
+	|-----trip_point_0_temp:	100000
 	|-----trip_point_0_type:	critical
-	|-----trip_point_1_temp:	80
+	|-----trip_point_1_temp:	80000
 	|-----trip_point_1_type:	passive
-	|-----trip_point_2_temp:	70
-	|-----trip_point_2_type:	active[0]
-	|-----trip_point_3_temp:	60
-	|-----trip_point_3_type:	active[1]
+	|-----trip_point_2_temp:	70000
+	|-----trip_point_2_type:	active0
+	|-----trip_point_3_temp:	60000
+	|-----trip_point_3_type:	active1
 	|-----cdev0:			--->/sys/class/thermal/cooling_device0
 	|-----cdev0_trip_point:		1	/* cdev0 can be used for passive */
 	|-----cdev1:			--->/sys/class/thermal/cooling_device3

drivers/thermal/Kconfig

@@ -4,6 +4,7 @@
 
 menuconfig THERMAL
 	bool "Generic Thermal sysfs driver"
+	select HWMON
 	default y
 	help
 	  Generic Thermal Sysfs driver offers a generic mechanism for

drivers/thermal/thermal.c

@@ -30,8 +30,10 @@
 #include <linux/idr.h>
 #include <linux/thermal.h>
 #include <linux/spinlock.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
 
-MODULE_AUTHOR("Zhang Rui")
+MODULE_AUTHOR("Zhang Rui");
 MODULE_DESCRIPTION("Generic thermal management sysfs support");
 MODULE_LICENSE("GPL");
 
@@ -56,6 +58,9 @@ static LIST_HEAD(thermal_tz_list);
 static LIST_HEAD(thermal_cdev_list);
 static DEFINE_MUTEX(thermal_list_lock);
 
+static struct device *thermal_hwmon;
+#define MAX_THERMAL_ZONES	10
+
 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 {
 	int err;
@@ -87,7 +92,67 @@ static void release_idr(struct idr *idr, struct mutex *lock, int id)
 		mutex_unlock(lock);
 }
 
-/* sys I/F for thermal zone */
+/* hwmon sys I/F*/
+static ssize_t
+name_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "thermal_sys_class\n");
+}
+
+static ssize_t
+temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct thermal_zone_device *tz;
+	struct sensor_device_attribute *sensor_attr
+						= to_sensor_dev_attr(attr);
+
+	list_for_each_entry(tz, &thermal_tz_list, node)
+		if (tz->id == sensor_attr->index)
+			return tz->ops->get_temp(tz, buf);
+
+	return -ENODEV;
+}
+
+static ssize_t
+temp_crit_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct thermal_zone_device *tz;
+	struct sensor_device_attribute *sensor_attr
+						= to_sensor_dev_attr(attr);
+
+	list_for_each_entry(tz, &thermal_tz_list, node)
+		if (tz->id == sensor_attr->index)
+			return tz->ops->get_trip_temp(tz, 0, buf);
+
+	return -ENODEV;
+}
+
+static DEVICE_ATTR(name, 0444, name_show, NULL);
+static struct sensor_device_attribute sensor_attrs[] = {
+	SENSOR_ATTR(temp1_input, 0444, temp_input_show, NULL, 0),
+	SENSOR_ATTR(temp1_crit, 0444, temp_crit_show, NULL, 0),
+	SENSOR_ATTR(temp2_input, 0444, temp_input_show, NULL, 1),
+	SENSOR_ATTR(temp2_crit, 0444, temp_crit_show, NULL, 1),
+	SENSOR_ATTR(temp3_input, 0444, temp_input_show, NULL, 2),
+	SENSOR_ATTR(temp3_crit, 0444, temp_crit_show, NULL, 2),
+	SENSOR_ATTR(temp4_input, 0444, temp_input_show, NULL, 3),
+	SENSOR_ATTR(temp4_crit, 0444, temp_crit_show, NULL, 3),
+	SENSOR_ATTR(temp5_input, 0444, temp_input_show, NULL, 4),
+	SENSOR_ATTR(temp5_crit, 0444, temp_crit_show, NULL, 4),
+	SENSOR_ATTR(temp6_input, 0444, temp_input_show, NULL, 5),
+	SENSOR_ATTR(temp6_crit, 0444, temp_crit_show, NULL, 5),
+	SENSOR_ATTR(temp7_input, 0444, temp_input_show, NULL, 6),
+	SENSOR_ATTR(temp7_crit, 0444, temp_crit_show, NULL, 6),
+	SENSOR_ATTR(temp8_input, 0444, temp_input_show, NULL, 7),
+	SENSOR_ATTR(temp8_crit, 0444, temp_crit_show, NULL, 7),
+	SENSOR_ATTR(temp9_input, 0444, temp_input_show, NULL, 8),
+	SENSOR_ATTR(temp9_crit, 0444, temp_crit_show, NULL, 8),
+	SENSOR_ATTR(temp10_input, 0444, temp_input_show, NULL, 9),
+	SENSOR_ATTR(temp10_crit, 0444, temp_crit_show, NULL, 9),
+};
+
+/* thermal zone sys I/F */
 
 #define to_thermal_zone(_dev) \
 	container_of(_dev, struct thermal_zone_device, device)
@@ -214,7 +279,7 @@ do {	\
 	device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);	\
 } while (0)
 
-/* sys I/F for cooling device */
+/* cooling device sys I/F */
 #define to_cooling_device(_dev)	\
 	container_of(_dev, struct thermal_cooling_device, device)
 
@@ -447,6 +512,9 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 	struct thermal_zone_device *pos;
 	int result;
 
+	if (!type)
+		return ERR_PTR(-EINVAL);
+
 	if (strlen(type) >= THERMAL_NAME_LENGTH)
 		return ERR_PTR(-EINVAL);
 
@@ -477,11 +545,9 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *type,
 	}
 
 	/* sys I/F */
-	if (type) {
 	result = device_create_file(&cdev->device, &dev_attr_cdev_type);
 	if (result)
 		goto unregister;
-	}
 
 	result = device_create_file(&cdev->device, &dev_attr_max_state);
 	if (result)
@@ -547,7 +613,7 @@ void thermal_cooling_device_unregister(struct
 		tz->ops->unbind(tz, cdev);
 	}
 	mutex_unlock(&thermal_list_lock);
-	if (cdev->type[0])
+
 	device_remove_file(&cdev->device, &dev_attr_cdev_type);
 	device_remove_file(&cdev->device, &dev_attr_max_state);
 	device_remove_file(&cdev->device, &dev_attr_cur_state);
@@ -580,6 +646,9 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
 	int result;
 	int count;
 
+	if (!type)
+		return ERR_PTR(-EINVAL);
+
 	if (strlen(type) >= THERMAL_NAME_LENGTH)
 		return ERR_PTR(-EINVAL);
 
@@ -601,6 +670,13 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
 		kfree(tz);
 		return ERR_PTR(result);
 	}
+	if (tz->id >= MAX_THERMAL_ZONES) {
+		printk(KERN_ERR PREFIX
+			"Too many thermal zones\n");
+		release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
+		kfree(tz);
+		return ERR_PTR(-EINVAL);
+	}
 
 	strcpy(tz->type, type);
 	tz->ops = ops;
@@ -615,12 +691,27 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
 		return ERR_PTR(result);
 	}
 
+	/* hwmon sys I/F */
+	result = device_create_file(thermal_hwmon,
+					&sensor_attrs[tz->id * 2].dev_attr);
+	if (result)
+		goto unregister;
+
+	if (trips > 0) {
+		char buf[40];
+		result = tz->ops->get_trip_type(tz, 0, buf);
+		if (result > 0 && !strcmp(buf, "critical\n")) {
+			result = device_create_file(thermal_hwmon,
+					&sensor_attrs[tz->id * 2 + 1].dev_attr);
+			if (result)
+				goto unregister;
+		}
+	}
+
 	/* sys I/F */
-	if (type) {
 	result = device_create_file(&tz->device, &dev_attr_type);
 	if (result)
 		goto unregister;
-	}
 
 	result = device_create_file(&tz->device, &dev_attr_temp);
 	if (result)
@@ -687,7 +778,16 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 		    tz->ops->unbind(tz, cdev);
 	mutex_unlock(&thermal_list_lock);
 
-	if (tz->type[0])
+	device_remove_file(thermal_hwmon,
+				&sensor_attrs[tz->id * 2].dev_attr);
+	if (tz->trips > 0) {
+		char buf[40];
+		if (tz->ops->get_trip_type(tz, 0, buf) > 0)
+			if (!strcmp(buf, "critical\n"))
+				device_remove_file(thermal_hwmon,
+				&sensor_attrs[tz->id * 2 + 1].dev_attr);
+	}
+
 	device_remove_file(&tz->device, &dev_attr_type);
 	device_remove_file(&tz->device, &dev_attr_temp);
 	if (tz->ops->get_mode)
@@ -705,6 +805,19 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 
 EXPORT_SYMBOL(thermal_zone_device_unregister);
 
+static void thermal_exit(void)
+{
+	if (thermal_hwmon) {
+		device_remove_file(thermal_hwmon, &dev_attr_name);
+		hwmon_device_unregister(thermal_hwmon);
+	}
+	class_unregister(&thermal_class);
+	idr_destroy(&thermal_tz_idr);
+	idr_destroy(&thermal_cdev_idr);
+	mutex_destroy(&thermal_idr_lock);
+	mutex_destroy(&thermal_list_lock);
+}
+
 static int __init thermal_init(void)
 {
 	int result = 0;
@@ -716,16 +829,20 @@ static int __init thermal_init(void)
 		mutex_destroy(&thermal_idr_lock);
 		mutex_destroy(&thermal_list_lock);
 	}
+
+	thermal_hwmon = hwmon_device_register(NULL);
+	if (IS_ERR(thermal_hwmon)) {
+		result = PTR_ERR(thermal_hwmon);
+		thermal_hwmon = NULL;
+		printk(KERN_ERR PREFIX
+			"unable to register hwmon device\n");
+		thermal_exit();
 		return result;
-}
+	}
 
-static void __exit thermal_exit(void)
-{
-	class_unregister(&thermal_class);
-	idr_destroy(&thermal_tz_idr);
-	idr_destroy(&thermal_cdev_idr);
-	mutex_destroy(&thermal_idr_lock);
-	mutex_destroy(&thermal_list_lock);
+	result = device_create_file(thermal_hwmon, &dev_attr_name);
+
+	return result;
 }
 
 subsys_initcall(thermal_init);