[mirror_ubuntu-artful-kernel.git] / drivers / thermal / thermal_sysfs.c

/*
 *  thermal.c - sysfs interface of thermal devices
 *
 *  Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
 *
 *  Highly based on original thermal_core.c
 *  Copyright (C) 2008 Intel Corp
 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
 *
 *  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; version 2 of the License.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>

#include "thermal_core.h"

/* sys I/F for thermal zone */

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

	return sprintf(buf, "%s\n", tz->type);
}

static ssize_t
temp_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int temperature, ret;

	ret = thermal_zone_get_temp(tz, &temperature);

	if (ret)
		return ret;

	return sprintf(buf, "%d\n", temperature);
}

static ssize_t
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	enum thermal_device_mode mode;
	int result;

	if (!tz->ops->get_mode)
		return -EPERM;

	result = tz->ops->get_mode(tz, &mode);
	if (result)
		return result;

	return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
		       : "disabled");
}

static ssize_t
mode_store(struct device *dev, struct device_attribute *attr,
	   const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int result;

	if (!tz->ops->set_mode)
		return -EPERM;

	if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
		result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
	else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
		result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
	else
		result = -EINVAL;

	if (result)
		return result;

	return count;
}

static ssize_t
trip_point_type_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	enum thermal_trip_type type;
	int trip, result;

	if (!tz->ops->get_trip_type)
		return -EPERM;

	if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
		return -EINVAL;

	result = tz->ops->get_trip_type(tz, trip, &type);
	if (result)
		return result;

	switch (type) {
	case THERMAL_TRIP_CRITICAL:
		return sprintf(buf, "critical\n");
	case THERMAL_TRIP_HOT:
		return sprintf(buf, "hot\n");
	case THERMAL_TRIP_PASSIVE:
		return sprintf(buf, "passive\n");
	case THERMAL_TRIP_ACTIVE:
		return sprintf(buf, "active\n");
	default:
		return sprintf(buf, "unknown\n");
	}
}

static ssize_t
trip_point_temp_store(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	int temperature;

	if (!tz->ops->set_trip_temp)
		return -EPERM;

	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
		return -EINVAL;

	if (kstrtoint(buf, 10, &temperature))
		return -EINVAL;

	ret = tz->ops->set_trip_temp(tz, trip, temperature);
	if (ret)
		return ret;

	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);

	return count;
}

static ssize_t
trip_point_temp_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	int temperature;

	if (!tz->ops->get_trip_temp)
		return -EPERM;

	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
		return -EINVAL;

	ret = tz->ops->get_trip_temp(tz, trip, &temperature);

	if (ret)
		return ret;

	return sprintf(buf, "%d\n", temperature);
}

static ssize_t
trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	int temperature;

	if (!tz->ops->set_trip_hyst)
		return -EPERM;

	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
		return -EINVAL;

	if (kstrtoint(buf, 10, &temperature))
		return -EINVAL;

	/*
	 * We are not doing any check on the 'temperature' value
	 * here. The driver implementing 'set_trip_hyst' has to
	 * take care of this.
	 */
	ret = tz->ops->set_trip_hyst(tz, trip, temperature);

	if (!ret)
		thermal_zone_set_trips(tz);

	return ret ? ret : count;
}

static ssize_t
trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip, ret;
	int temperature;

	if (!tz->ops->get_trip_hyst)
		return -EPERM;

	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
		return -EINVAL;

	ret = tz->ops->get_trip_hyst(tz, trip, &temperature);

	return ret ? ret : sprintf(buf, "%d\n", temperature);
}

static ssize_t
passive_store(struct device *dev, struct device_attribute *attr,
	      const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int state;

	if (sscanf(buf, "%d\n", &state) != 1)
		return -EINVAL;

	/* sanity check: values below 1000 millicelcius don't make sense
	 * and can cause the system to go into a thermal heart attack
	 */
	if (state && state < 1000)
		return -EINVAL;

	if (state && !tz->forced_passive) {
		if (!tz->passive_delay)
			tz->passive_delay = 1000;
		thermal_zone_device_rebind_exception(tz, "Processor",
						     sizeof("Processor"));
	} else if (!state && tz->forced_passive) {
		tz->passive_delay = 0;
		thermal_zone_device_unbind_exception(tz, "Processor",
						     sizeof("Processor"));
	}

	tz->forced_passive = state;

	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);

	return count;
}

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

	return sprintf(buf, "%d\n", tz->forced_passive);
}

static ssize_t
policy_store(struct device *dev, struct device_attribute *attr,
	     const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	char name[THERMAL_NAME_LENGTH];
	int ret;

	snprintf(name, sizeof(name), "%s", buf);

	ret = thermal_zone_device_set_policy(tz, name);
	if (!ret)
		ret = count;

	return ret;
}

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

	return sprintf(buf, "%s\n", tz->governor->name);
}

static ssize_t
available_policies_show(struct device *dev, struct device_attribute *devattr,
			char *buf)
{
	return thermal_build_list_of_policies(buf);
}

static ssize_t
emul_temp_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int ret = 0;
	int temperature;

	if (kstrtoint(buf, 10, &temperature))
		return -EINVAL;

	if (!tz->ops->set_emul_temp) {
		mutex_lock(&tz->lock);
		tz->emul_temperature = temperature;
		mutex_unlock(&tz->lock);
	} else {
		ret = tz->ops->set_emul_temp(tz, temperature);
	}

	if (!ret)
		thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);

	return ret ? ret : count;
}

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;
}

#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, "%d\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);
create_s32_tzp_attr(slope);
create_s32_tzp_attr(offset);
#undef create_s32_tzp_attr

/*
 * These are thermal zone device attributes that will always be present.
 * All the attributes created for tzp (create_s32_tzp_attr) also are always
 * present on the sysfs interface.
 */
static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
		   sustainable_power_store);

/* These thermal zone device attributes are created based on conditions */
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);

/* These attributes are unconditionally added to a thermal zone */
static struct attribute *thermal_zone_dev_attrs[] = {
	&dev_attr_type.attr,
	&dev_attr_temp.attr,
#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
	&dev_attr_emul_temp.attr,
#endif
	&dev_attr_policy.attr,
	&dev_attr_available_policies.attr,
	&dev_attr_sustainable_power.attr,
	&dev_attr_k_po.attr,
	&dev_attr_k_pu.attr,
	&dev_attr_k_i.attr,
	&dev_attr_k_d.attr,
	&dev_attr_integral_cutoff.attr,
	&dev_attr_slope.attr,
	&dev_attr_offset.attr,
	NULL,
};

static struct attribute_group thermal_zone_attribute_group = {
	.attrs = thermal_zone_dev_attrs,
};

/* We expose mode only if .get_mode is present */
static struct attribute *thermal_zone_mode_attrs[] = {
	&dev_attr_mode.attr,
	NULL,
};

static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
					    struct attribute *attr,
					    int attrno)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct thermal_zone_device *tz;

	tz = container_of(dev, struct thermal_zone_device, device);

	if (tz->ops->get_mode)
		return attr->mode;

	return 0;
}

static struct attribute_group thermal_zone_mode_attribute_group = {
	.attrs = thermal_zone_mode_attrs,
	.is_visible = thermal_zone_mode_is_visible,
};

/* We expose passive only if passive trips are present */
static struct attribute *thermal_zone_passive_attrs[] = {
	&dev_attr_passive.attr,
	NULL,
};

static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
					       struct attribute *attr,
					       int attrno)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct thermal_zone_device *tz;
	enum thermal_trip_type trip_type;
	int count, passive = 0;

	tz = container_of(dev, struct thermal_zone_device, device);

	for (count = 0; count < tz->trips && !passive; count++) {
		tz->ops->get_trip_type(tz, count, &trip_type);

		if (trip_type == THERMAL_TRIP_PASSIVE)
			passive = 1;
	}

	if (!passive)
		return attr->mode;

	return 0;
}

static struct attribute_group thermal_zone_passive_attribute_group = {
	.attrs = thermal_zone_passive_attrs,
	.is_visible = thermal_zone_passive_is_visible,
};

static const struct attribute_group *thermal_zone_attribute_groups[] = {
	&thermal_zone_attribute_group,
	&thermal_zone_mode_attribute_group,
	&thermal_zone_passive_attribute_group,
	/* This is not NULL terminated as we create the group dynamically */
};

/**
 * create_trip_attrs() - create attributes for trip points
 * @tz:		the thermal zone device
 * @mask:	Writeable trip point bitmap.
 *
 * helper function to instantiate sysfs entries for every trip
 * point and its properties of a struct thermal_zone_device.
 *
 * Return: 0 on success, the proper error value otherwise.
 */
static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
{
	int size = sizeof(struct thermal_attr) * tz->trips;
	struct attribute **attrs;
	int indx;

	/* This function works only for zones with at least one trip */
	if (tz->trips <= 0)
		return -EINVAL;

	tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
	if (!tz->trip_type_attrs)
		return -ENOMEM;

	tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
	if (!tz->trip_temp_attrs) {
		kfree(tz->trip_type_attrs);
		return -ENOMEM;
	}

	if (tz->ops->get_trip_hyst) {
		tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
		if (!tz->trip_hyst_attrs) {
			kfree(tz->trip_type_attrs);
			kfree(tz->trip_temp_attrs);
			return -ENOMEM;
		}
	}

	attrs = kzalloc(sizeof(*attrs) * tz->trips * 3 + 1, GFP_KERNEL);
	if (!attrs) {
		kfree(tz->trip_type_attrs);
		kfree(tz->trip_temp_attrs);
		if (tz->ops->get_trip_hyst)
			kfree(tz->trip_hyst_attrs);
		return -ENOMEM;
	}

	for (indx = 0; indx < tz->trips; indx++) {
		/* create trip type attribute */
		snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_type", indx);

		sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
		tz->trip_type_attrs[indx].attr.attr.name =
						tz->trip_type_attrs[indx].name;
		tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
		attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;

		/* create trip temp attribute */
		snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_temp", indx);

		sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
		tz->trip_temp_attrs[indx].attr.attr.name =
						tz->trip_temp_attrs[indx].name;
		tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
		if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
		    mask & (1 << indx)) {
			tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
			tz->trip_temp_attrs[indx].attr.store =
							trip_point_temp_store;
		}
		attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;

		/* create Optional trip hyst attribute */
		if (!tz->ops->get_trip_hyst)
			continue;
		snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_hyst", indx);

		sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
		tz->trip_hyst_attrs[indx].attr.attr.name =
					tz->trip_hyst_attrs[indx].name;
		tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
		if (tz->ops->set_trip_hyst) {
			tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
			tz->trip_hyst_attrs[indx].attr.store =
					trip_point_hyst_store;
		}
		attrs[indx + tz->trips * 2] =
					&tz->trip_hyst_attrs[indx].attr.attr;
	}
	attrs[tz->trips * 3] = NULL;

	tz->trips_attribute_group.attrs = attrs;

	return 0;
}

int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
				      int mask)
{
	const struct attribute_group **groups;
	int i, size, result;

	/* we need one extra for trips and the NULL to terminate the array */
	size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
	/* This also takes care of API requirement to be NULL terminated */
	groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
	if (!groups)
		return -ENOMEM;

	for (i = 0; i < size - 2; i++)
		groups[i] = thermal_zone_attribute_groups[i];

	if (tz->trips) {
		result = create_trip_attrs(tz, mask);
		if (result) {
			kfree(groups);

			return result;
		}

		groups[size - 2] = &tz->trips_attribute_group;
	}

	tz->device.groups = groups;

	return 0;
}
Commit	Line	Data
a369ee88 EV	1	/*
	2	* thermal.c - sysfs interface of thermal devices
	3	*
	4	* Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
	5	*
	6	* Highly based on original thermal_core.c
	7	* Copyright (C) 2008 Intel Corp
	8	* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
	9	* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; version 2 of the License.
	14	*/
	15
	16	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	17
	18	#include <linux/sysfs.h>
	19	#include <linux/device.h>
	20	#include <linux/err.h>
	21	#include <linux/slab.h>
	22	#include <linux/string.h>
	23
	24	#include "thermal_core.h"
	25
	26	/* sys I/F for thermal zone */
	27
	28	static ssize_t
	29	type_show(struct device dev, struct device_attribute attr, char *buf)
	30	{
	31	struct thermal_zone_device *tz = to_thermal_zone(dev);
	32
	33	return sprintf(buf, "%s\n", tz->type);
	34	}
	35
	36	static ssize_t
	37	temp_show(struct device dev, struct device_attribute attr, char *buf)
	38	{
	39	struct thermal_zone_device *tz = to_thermal_zone(dev);
	40	int temperature, ret;
	41
	42	ret = thermal_zone_get_temp(tz, &temperature);
	43
	44	if (ret)
	45	return ret;
	46
	47	return sprintf(buf, "%d\n", temperature);
	48	}
	49
	50	static ssize_t
	51	mode_show(struct device dev, struct device_attribute attr, char *buf)
	52	{
	53	struct thermal_zone_device *tz = to_thermal_zone(dev);
	54	enum thermal_device_mode mode;
	55	int result;
	56
	57	if (!tz->ops->get_mode)
	58	return -EPERM;
	59
	60	result = tz->ops->get_mode(tz, &mode);
	61	if (result)
	62	return result;
	63
	64	return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
65	: "disabled");
66	}
67
68	static ssize_t
69	mode_store(struct device dev, struct device_attribute attr,
70	const char *buf, size_t count)
71	{
72	struct thermal_zone_device *tz = to_thermal_zone(dev);
73	int result;
74
75	if (!tz->ops->set_mode)
76	return -EPERM;
77
78	if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
79	result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
80	else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
81	result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
82	else
83	result = -EINVAL;
84
85	if (result)
86	return result;
87
88	return count;
89	}
90
91	static ssize_t
92	trip_point_type_show(struct device dev, struct device_attribute attr,
93	char *buf)
94	{
95	struct thermal_zone_device *tz = to_thermal_zone(dev);
96	enum thermal_trip_type type;
97	int trip, result;
98
99	if (!tz->ops->get_trip_type)
100	return -EPERM;
101
102	if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
103	return -EINVAL;
104
105	result = tz->ops->get_trip_type(tz, trip, &type);
106	if (result)
107	return result;
108
109	switch (type) {
110	case THERMAL_TRIP_CRITICAL:
111	return sprintf(buf, "critical\n");
112	case THERMAL_TRIP_HOT:
113	return sprintf(buf, "hot\n");
114	case THERMAL_TRIP_PASSIVE:
115	return sprintf(buf, "passive\n");
116	case THERMAL_TRIP_ACTIVE:
117	return sprintf(buf, "active\n");
118	default:
119	return sprintf(buf, "unknown\n");
120	}
121	}
122
123	static ssize_t
124	trip_point_temp_store(struct device dev, struct device_attribute attr,
125	const char *buf, size_t count)
126	{
127	struct thermal_zone_device *tz = to_thermal_zone(dev);
128	int trip, ret;
129	int temperature;
130
131	if (!tz->ops->set_trip_temp)
132	return -EPERM;
133
134	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
135	return -EINVAL;
136
137	if (kstrtoint(buf, 10, &temperature))
138	return -EINVAL;
139
140	ret = tz->ops->set_trip_temp(tz, trip, temperature);
141	if (ret)
142	return ret;
143
144	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
145
146	return count;
147	}
148
149	static ssize_t
150	trip_point_temp_show(struct device dev, struct device_attribute attr,
151	char *buf)
152	{
153	struct thermal_zone_device *tz = to_thermal_zone(dev);
154	int trip, ret;
155	int temperature;
156
157	if (!tz->ops->get_trip_temp)
158	return -EPERM;
159
160	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
161	return -EINVAL;
162
163	ret = tz->ops->get_trip_temp(tz, trip, &temperature);
164
165	if (ret)
166	return ret;
167
168	return sprintf(buf, "%d\n", temperature);
169	}
170
171	static ssize_t
172	trip_point_hyst_store(struct device dev, struct device_attribute attr,
173	const char *buf, size_t count)
174	{
175	struct thermal_zone_device *tz = to_thermal_zone(dev);
176	int trip, ret;
177	int temperature;
178
179	if (!tz->ops->set_trip_hyst)
180	return -EPERM;
181
182	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
183	return -EINVAL;
184
185	if (kstrtoint(buf, 10, &temperature))
186	return -EINVAL;
187
188	/*
189	* We are not doing any check on the 'temperature' value
190	* here. The driver implementing 'set_trip_hyst' has to
191	* take care of this.
192	*/
193	ret = tz->ops->set_trip_hyst(tz, trip, temperature);
194
195	if (!ret)
196	thermal_zone_set_trips(tz);
197
198	return ret ? ret : count;
199	}
200
201	static ssize_t
202	trip_point_hyst_show(struct device dev, struct device_attribute attr,
203	char *buf)
204	{
205	struct thermal_zone_device *tz = to_thermal_zone(dev);
206	int trip, ret;
207	int temperature;
208
209	if (!tz->ops->get_trip_hyst)
210	return -EPERM;
211
212	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
213	return -EINVAL;
214
215	ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
216
217	return ret ? ret : sprintf(buf, "%d\n", temperature);
218	}
219
220	static ssize_t
221	passive_store(struct device dev, struct device_attribute attr,
222	const char *buf, size_t count)
223	{
224	struct thermal_zone_device *tz = to_thermal_zone(dev);
225	int state;
226
227	if (sscanf(buf, "%d\n", &state) != 1)
228	return -EINVAL;
229
230	/* sanity check: values below 1000 millicelcius don't make sense
231	* and can cause the system to go into a thermal heart attack
232	*/
233	if (state && state < 1000)
234	return -EINVAL;
235
236	if (state && !tz->forced_passive) {
237	if (!tz->passive_delay)
238	tz->passive_delay = 1000;
239	thermal_zone_device_rebind_exception(tz, "Processor",
240	sizeof("Processor"));
241	} else if (!state && tz->forced_passive) {
242	tz->passive_delay = 0;
243	thermal_zone_device_unbind_exception(tz, "Processor",
244	sizeof("Processor"));
245	}
246
247	tz->forced_passive = state;
248
249	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
250
251	return count;
252	}
253
254	static ssize_t
255	passive_show(struct device dev, struct device_attribute attr,
256	char *buf)
257	{
258	struct thermal_zone_device *tz = to_thermal_zone(dev);
259
260	return sprintf(buf, "%d\n", tz->forced_passive);
261	}
262
263	static ssize_t
264	policy_store(struct device dev, struct device_attribute attr,
265	const char *buf, size_t count)
266	{
267	struct thermal_zone_device *tz = to_thermal_zone(dev);
268	char name[THERMAL_NAME_LENGTH];
269	int ret;
270
271	snprintf(name, sizeof(name), "%s", buf);
272
273	ret = thermal_zone_device_set_policy(tz, name);
274	if (!ret)
275	ret = count;
276
277	return ret;
278	}
279
280	static ssize_t
281	policy_show(struct device dev, struct device_attribute devattr, char *buf)
282	{
283	struct thermal_zone_device *tz = to_thermal_zone(dev);
284
285	return sprintf(buf, "%s\n", tz->governor->name);
286	}
287
288	static ssize_t
289	available_policies_show(struct device dev, struct device_attribute devattr,
290	char *buf)
291	{
292	return thermal_build_list_of_policies(buf);
293	}
294
295	static ssize_t
296	emul_temp_store(struct device dev, struct device_attribute attr,
297	const char *buf, size_t count)
298	{
299	struct thermal_zone_device *tz = to_thermal_zone(dev);
300	int ret = 0;
301	int temperature;
302
303	if (kstrtoint(buf, 10, &temperature))
304	return -EINVAL;
305
306	if (!tz->ops->set_emul_temp) {
307	mutex_lock(&tz->lock);
308	tz->emul_temperature = temperature;
309	mutex_unlock(&tz->lock);
310	} else {
311	ret = tz->ops->set_emul_temp(tz, temperature);
312	}
313
314	if (!ret)
315	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
316
317	return ret ? ret : count;
318	}
319
320	static ssize_t
321	sustainable_power_show(struct device dev, struct device_attribute devattr,
322	char *buf)
323	{
324	struct thermal_zone_device *tz = to_thermal_zone(dev);
325
326	if (tz->tzp)
327	return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
328	else
329	return -EIO;
330	}
331
332	static ssize_t
333	sustainable_power_store(struct device dev, struct device_attribute devattr,
334	const char *buf, size_t count)
335	{
336	struct thermal_zone_device *tz = to_thermal_zone(dev);
337	u32 sustainable_power;
338
339	if (!tz->tzp)
340	return -EIO;
341
342	if (kstrtou32(buf, 10, &sustainable_power))
343	return -EINVAL;
344
345	tz->tzp->sustainable_power = sustainable_power;
346
347	return count;
348	}
349
350	#define create_s32_tzp_attr(name) \
351	static ssize_t \
352	name##_show(struct device dev, struct device_attribute devattr, \
353	char *buf) \
354	{ \
355	struct thermal_zone_device *tz = to_thermal_zone(dev); \
356	\
357	if (tz->tzp) \
358	return sprintf(buf, "%d\n", tz->tzp->name); \
359	else \
360	return -EIO; \
361	} \
362	\
363	static ssize_t \
364	name##_store(struct device dev, struct device_attribute devattr, \
365	const char *buf, size_t count) \
366	{ \
367	struct thermal_zone_device *tz = to_thermal_zone(dev); \
368	s32 value; \
369	\
370	if (!tz->tzp) \
371	return -EIO; \
372	\
373	if (kstrtos32(buf, 10, &value)) \
374	return -EINVAL; \
375	\
376	tz->tzp->name = value; \
377	\
378	return count; \
379	} \
380	static DEVICE_ATTR(name, S_IWUSR \| S_IRUGO, name##_show, name##_store)
381
382	create_s32_tzp_attr(k_po);
383	create_s32_tzp_attr(k_pu);
384	create_s32_tzp_attr(k_i);
385	create_s32_tzp_attr(k_d);
386	create_s32_tzp_attr(integral_cutoff);
387	create_s32_tzp_attr(slope);
388	create_s32_tzp_attr(offset);
389	#undef create_s32_tzp_attr
390
391	/*
392	* These are thermal zone device attributes that will always be present.
393	* All the attributes created for tzp (create_s32_tzp_attr) also are always
394	* present on the sysfs interface.
395	*/
396	static DEVICE_ATTR(type, 0444, type_show, NULL);
397	static DEVICE_ATTR(temp, 0444, temp_show, NULL);
398	static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
399	static DEVICE_ATTR(policy, S_IRUGO \| S_IWUSR, policy_show, policy_store);
400	static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
401	static DEVICE_ATTR(sustainable_power, S_IWUSR \| S_IRUGO, sustainable_power_show,
402	sustainable_power_store);
403
404	/* These thermal zone device attributes are created based on conditions */
405	static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
406	static DEVICE_ATTR(passive, S_IRUGO \| S_IWUSR, passive_show, passive_store);
407
408	/* These attributes are unconditionally added to a thermal zone */
409	static struct attribute *thermal_zone_dev_attrs[] = {
410	&dev_attr_type.attr,
411	&dev_attr_temp.attr,
412	#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
413	&dev_attr_emul_temp.attr,
414	#endif
415	&dev_attr_policy.attr,
416	&dev_attr_available_policies.attr,
417	&dev_attr_sustainable_power.attr,
418	&dev_attr_k_po.attr,
419	&dev_attr_k_pu.attr,
420	&dev_attr_k_i.attr,
421	&dev_attr_k_d.attr,
422	&dev_attr_integral_cutoff.attr,
423	&dev_attr_slope.attr,
424	&dev_attr_offset.attr,
425	NULL,
426	};
427
428	static struct attribute_group thermal_zone_attribute_group = {
429	.attrs = thermal_zone_dev_attrs,
430	};
431
432	/* We expose mode only if .get_mode is present */
433	static struct attribute *thermal_zone_mode_attrs[] = {
434	&dev_attr_mode.attr,
435	NULL,
436	};
437
438	static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
439	struct attribute *attr,
440	int attrno)
441	{
442	struct device *dev = container_of(kobj, struct device, kobj);
443	struct thermal_zone_device *tz;
444
445	tz = container_of(dev, struct thermal_zone_device, device);
446
447	if (tz->ops->get_mode)
448	return attr->mode;
449
450	return 0;
451	}
452
453	static struct attribute_group thermal_zone_mode_attribute_group = {
454	.attrs = thermal_zone_mode_attrs,
455	.is_visible = thermal_zone_mode_is_visible,
456	};
457
458	/* We expose passive only if passive trips are present */
459	static struct attribute *thermal_zone_passive_attrs[] = {
460	&dev_attr_passive.attr,
461	NULL,
462	};
463
464	static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
465	struct attribute *attr,
466	int attrno)
467	{
468	struct device *dev = container_of(kobj, struct device, kobj);
469	struct thermal_zone_device *tz;
470	enum thermal_trip_type trip_type;
471	int count, passive = 0;
472
473	tz = container_of(dev, struct thermal_zone_device, device);
474
475	for (count = 0; count < tz->trips && !passive; count++) {
476	tz->ops->get_trip_type(tz, count, &trip_type);
477
478	if (trip_type == THERMAL_TRIP_PASSIVE)
479	passive = 1;
480	}
481
482	if (!passive)
483	return attr->mode;
484
485	return 0;
486	}
487
488	static struct attribute_group thermal_zone_passive_attribute_group = {
489	.attrs = thermal_zone_passive_attrs,
490	.is_visible = thermal_zone_passive_is_visible,
491	};
492
493	static const struct attribute_group *thermal_zone_attribute_groups[] = {
494	&thermal_zone_attribute_group,
495	&thermal_zone_mode_attribute_group,
496	&thermal_zone_passive_attribute_group,
497	/* This is not NULL terminated as we create the group dynamically */
498	};
499
500	/**
501	* create_trip_attrs() - create attributes for trip points
502	* @tz: the thermal zone device
503	* @mask: Writeable trip point bitmap.
504	*
505	* helper function to instantiate sysfs entries for every trip
506	* point and its properties of a struct thermal_zone_device.
507	*
508	* Return: 0 on success, the proper error value otherwise.
509	*/
510	static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
511	{
512	int size = sizeof(struct thermal_attr) * tz->trips;
513	struct attribute **attrs;
514	int indx;
515
516	/* This function works only for zones with at least one trip */
517	if (tz->trips <= 0)
518	return -EINVAL;
519
520	tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
521	if (!tz->trip_type_attrs)
522	return -ENOMEM;
523
524	tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
525	if (!tz->trip_temp_attrs) {
526	kfree(tz->trip_type_attrs);
527	return -ENOMEM;
528	}
529
530	if (tz->ops->get_trip_hyst) {
531	tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
532	if (!tz->trip_hyst_attrs) {
533	kfree(tz->trip_type_attrs);
534	kfree(tz->trip_temp_attrs);
535	return -ENOMEM;
536	}
537	}
538
539	attrs = kzalloc(sizeof(attrs) tz->trips * 3 + 1, GFP_KERNEL);
540	if (!attrs) {
541	kfree(tz->trip_type_attrs);
542	kfree(tz->trip_temp_attrs);
543	if (tz->ops->get_trip_hyst)
544	kfree(tz->trip_hyst_attrs);
545	return -ENOMEM;
546	}
547
548	for (indx = 0; indx < tz->trips; indx++) {
549	/* create trip type attribute */
550	snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
551	"trip_point_%d_type", indx);
552
553	sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
554	tz->trip_type_attrs[indx].attr.attr.name =
555	tz->trip_type_attrs[indx].name;
556	tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
557	tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
558	attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
559
560	/* create trip temp attribute */
561	snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
562	"trip_point_%d_temp", indx);
563
564	sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
565	tz->trip_temp_attrs[indx].attr.attr.name =
566	tz->trip_temp_attrs[indx].name;
567	tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
568	tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
569	if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
570	mask & (1 << indx)) {
571	tz->trip_temp_attrs[indx].attr.attr.mode \|= S_IWUSR;
572	tz->trip_temp_attrs[indx].attr.store =
573	trip_point_temp_store;
574	}
575	attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
576
577	/* create Optional trip hyst attribute */
578	if (!tz->ops->get_trip_hyst)
579	continue;
580	snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
581	"trip_point_%d_hyst", indx);
582
583	sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
584	tz->trip_hyst_attrs[indx].attr.attr.name =
585	tz->trip_hyst_attrs[indx].name;
586	tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
587	tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
588	if (tz->ops->set_trip_hyst) {
589	tz->trip_hyst_attrs[indx].attr.attr.mode \|= S_IWUSR;
590	tz->trip_hyst_attrs[indx].attr.store =
591	trip_point_hyst_store;
592	}
593	attrs[indx + tz->trips * 2] =
594	&tz->trip_hyst_attrs[indx].attr.attr;
595	}
596	attrs[tz->trips * 3] = NULL;
597
598	tz->trips_attribute_group.attrs = attrs;
599
600	return 0;
601	}
602
603	int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
604	int mask)
605	{
606	const struct attribute_group **groups;
607	int i, size, result;
608
609	/* we need one extra for trips and the NULL to terminate the array */
610	size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
611	/* This also takes care of API requirement to be NULL terminated */
612	groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
613	if (!groups)
614	return -ENOMEM;
615
616	for (i = 0; i < size - 2; i++)
617	groups[i] = thermal_zone_attribute_groups[i];
618
619	if (tz->trips) {
620	result = create_trip_attrs(tz, mask);
621	if (result) {
622	kfree(groups);
623
624	return result;
625	}
626
627	groups[size - 2] = &tz->trips_attribute_group;
628	}
629
630	tz->device.groups = groups;
631
632	return 0;
633	}