thermal: export thermal_zone_parameters to sysfs (9f38271c) · Commits · 戴 / test

Documentation/thermal/sysfs-api.txt

+52 −0

Original line number	Diff line number	Diff line
		@@ -184,6 +184,12 @@ Thermal zone device sys I/F, created once it's registered:
		\|---trip_point_[0-*]_type: Trip point type
		\|---trip_point_[0-*]_hyst: Hysteresis value for this trip point
		\|---emul_temp: Emulated temperature set node
		\|---sustainable_power: Sustainable dissipatable power
		\|---k_po: Proportional term during temperature overshoot
		\|---k_pu: Proportional term during temperature undershoot
		\|---k_i: PID's integral term in the power allocator gov
		\|---k_d: PID's derivative term in the power allocator
		\|---integral_cutoff: Offset above which errors are accumulated

		Thermal cooling device sys I/F, created once it's registered:
		/sys/class/thermal/cooling_device[0-*]:
		@@ -307,6 +313,52 @@ emul_temp
		because userland can easily disable the thermal policy by simply
		flooding this sysfs node with low temperature values.

		sustainable_power
		An estimate of the sustained power that can be dissipated by
		the thermal zone. Used by the power allocator governor. For
		more information see Documentation/thermal/power_allocator.txt
		Unit: milliwatts
		RW, Optional

		k_po
		The proportional term of the power allocator governor's PID
		controller during temperature overshoot. Temperature overshoot
		is when the current temperature is above the "desired
		temperature" trip point. For more information see
		Documentation/thermal/power_allocator.txt
		RW, Optional

		k_pu
		The proportional term of the power allocator governor's PID
		controller during temperature undershoot. Temperature undershoot
		is when the current temperature is below the "desired
		temperature" trip point. For more information see
		Documentation/thermal/power_allocator.txt
		RW, Optional

		k_i
		The integral term of the power allocator governor's PID
		controller. This term allows the PID controller to compensate
		for long term drift. For more information see
		Documentation/thermal/power_allocator.txt
		RW, Optional

		k_d
		The derivative term of the power allocator governor's PID
		controller. For more information see
		Documentation/thermal/power_allocator.txt
		RW, Optional

		integral_cutoff
		Temperature offset from the desired temperature trip point
		above which the integral term of the power allocator
		governor's PID controller starts accumulating errors. For
		example, if integral_cutoff is 0, then the integral term only
		accumulates error when temperature is above the desired
		temperature trip point. For more information see
		Documentation/thermal/power_allocator.txt
		RW, Optional

		*****************************
		* Cooling device attributes *
		*****************************

drivers/thermal/thermal_core.c

+101 −0

Original line number	Diff line number	Diff line
		@@ -875,6 +875,102 @@ emul_temp_store(struct device dev, struct device_attribute attr,
		static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
		#endif/CONFIG_THERMAL_EMULATION/

		static ssize_t
		sustainable_power_show(struct device dev, struct device_attribute devattr,
		char *buf)
		{
		struct thermal_zone_device *tz = to_thermal_zone(dev);

		if (tz->tzp)
		return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
		else
		return -EIO;
		}

		static ssize_t
		sustainable_power_store(struct device dev, struct device_attribute devattr,
		const char *buf, size_t count)
		{
		struct thermal_zone_device *tz = to_thermal_zone(dev);
		u32 sustainable_power;

		if (!tz->tzp)
		return -EIO;

		if (kstrtou32(buf, 10, &sustainable_power))
		return -EINVAL;

		tz->tzp->sustainable_power = sustainable_power;

		return count;
		}
		static DEVICE_ATTR(sustainable_power, S_IWUSR \| S_IRUGO, sustainable_power_show,
		sustainable_power_store);

		#define create_s32_tzp_attr(name) \
		static ssize_t \
		name##_show(struct device dev, struct device_attribute devattr, \
		char *buf) \
		{ \
		struct thermal_zone_device *tz = to_thermal_zone(dev); \
		\
		if (tz->tzp) \
		return sprintf(buf, "%u\n", tz->tzp->name); \
		else \
		return -EIO; \
		} \
		\
		static ssize_t \
		name##_store(struct device dev, struct device_attribute devattr, \
		const char *buf, size_t count) \
		{ \
		struct thermal_zone_device *tz = to_thermal_zone(dev); \
		s32 value; \
		\
		if (!tz->tzp) \
		return -EIO; \
		\
		if (kstrtos32(buf, 10, &value)) \
		return -EINVAL; \
		\
		tz->tzp->name = value; \
		\
		return count; \
		} \
		static DEVICE_ATTR(name, S_IWUSR \| S_IRUGO, name##_show, name##_store)

		create_s32_tzp_attr(k_po);
		create_s32_tzp_attr(k_pu);
		create_s32_tzp_attr(k_i);
		create_s32_tzp_attr(k_d);
		create_s32_tzp_attr(integral_cutoff);
		#undef create_s32_tzp_attr

		static struct device_attribute *dev_tzp_attrs[] = {
		&dev_attr_sustainable_power,
		&dev_attr_k_po,
		&dev_attr_k_pu,
		&dev_attr_k_i,
		&dev_attr_k_d,
		&dev_attr_integral_cutoff,
		};

		static int create_tzp_attrs(struct device *dev)
		{
		int i;

		for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
		int ret;
		struct device_attribute *dev_attr = dev_tzp_attrs[i];

		ret = device_create_file(dev, dev_attr);
		if (ret)
		return ret;
		}

		return 0;
		}

		/**
		* power_actor_get_max_power() - get the maximum power that a cdev can consume
		* @cdev: pointer to &thermal_cooling_device
		@@ -1712,6 +1808,11 @@ struct thermal_zone_device thermal_zone_device_register(const char type,
		if (result)
		goto unregister;

		/* Add thermal zone params */
		result = create_tzp_attrs(&tz->device);
		if (result)
		goto unregister;

		/* Update 'this' zone's governor information */
		mutex_lock(&thermal_governor_lock);

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