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-rw-r--r--drivers/thermal/thermal_sysfs.c920
1 files changed, 920 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
new file mode 100644
index 000000000..bd7596125
--- /dev/null
+++ b/drivers/thermal/thermal_sysfs.c
@@ -0,0 +1,920 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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>
+ */
+
+#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 <linux/jiffies.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);
+ int enabled;
+
+ mutex_lock(&tz->lock);
+ enabled = thermal_zone_device_is_enabled(tz);
+ mutex_unlock(&tz->lock);
+
+ return sprintf(buf, "%s\n", 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 (!strncmp(buf, "enabled", sizeof("enabled") - 1))
+ result = thermal_zone_device_enable(tz);
+ else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
+ result = thermal_zone_device_disable(tz);
+ 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, hyst = 0;
+ enum thermal_trip_type type;
+
+ if (!tz->ops->set_trip_temp && !tz->trips)
+ return -EPERM;
+
+ if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
+ return -EINVAL;
+
+ if (kstrtoint(buf, 10, &temperature))
+ return -EINVAL;
+
+ if (tz->ops->set_trip_temp) {
+ ret = tz->ops->set_trip_temp(tz, trip, temperature);
+ if (ret)
+ return ret;
+ }
+
+ if (tz->trips)
+ tz->trips[trip].temperature = temperature;
+
+ if (tz->ops->get_trip_hyst) {
+ ret = tz->ops->get_trip_hyst(tz, trip, &hyst);
+ if (ret)
+ return ret;
+ }
+
+ ret = tz->ops->get_trip_type(tz, trip, &type);
+ if (ret)
+ return ret;
+
+ thermal_notify_tz_trip_change(tz->id, trip, type, temperature, hyst);
+
+ 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
+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);
+}
+
+#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
+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 DEVICE_ATTR_WO(emul_temp);
+#endif
+
+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_RW(name)
+
+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_RO(type);
+static DEVICE_ATTR_RO(temp);
+static DEVICE_ATTR_RW(policy);
+static DEVICE_ATTR_RO(available_policies);
+static DEVICE_ATTR_RW(sustainable_power);
+
+/* These thermal zone device attributes are created based on conditions */
+static DEVICE_ATTR_RW(mode);
+
+/* 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 const struct attribute_group thermal_zone_attribute_group = {
+ .attrs = thermal_zone_dev_attrs,
+};
+
+static struct attribute *thermal_zone_mode_attrs[] = {
+ &dev_attr_mode.attr,
+ NULL,
+};
+
+static const struct attribute_group thermal_zone_mode_attribute_group = {
+ .attrs = thermal_zone_mode_attrs,
+};
+
+static const struct attribute_group *thermal_zone_attribute_groups[] = {
+ &thermal_zone_attribute_group,
+ &thermal_zone_mode_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)
+{
+ struct attribute **attrs;
+ int indx;
+
+ /* This function works only for zones with at least one trip */
+ if (tz->num_trips <= 0)
+ return -EINVAL;
+
+ tz->trip_type_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_type_attrs),
+ GFP_KERNEL);
+ if (!tz->trip_type_attrs)
+ return -ENOMEM;
+
+ tz->trip_temp_attrs = kcalloc(tz->num_trips, sizeof(*tz->trip_temp_attrs),
+ GFP_KERNEL);
+ if (!tz->trip_temp_attrs) {
+ kfree(tz->trip_type_attrs);
+ return -ENOMEM;
+ }
+
+ if (tz->ops->get_trip_hyst) {
+ tz->trip_hyst_attrs = kcalloc(tz->num_trips,
+ sizeof(*tz->trip_hyst_attrs),
+ GFP_KERNEL);
+ if (!tz->trip_hyst_attrs) {
+ kfree(tz->trip_type_attrs);
+ kfree(tz->trip_temp_attrs);
+ return -ENOMEM;
+ }
+ }
+
+ attrs = kcalloc(tz->num_trips * 3 + 1, sizeof(*attrs), 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->num_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->num_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->num_trips * 2] =
+ &tz->trip_hyst_attrs[indx].attr.attr;
+ }
+ attrs[tz->num_trips * 3] = NULL;
+
+ tz->trips_attribute_group.attrs = attrs;
+
+ return 0;
+}
+
+/**
+ * destroy_trip_attrs() - destroy attributes for trip points
+ * @tz: the thermal zone device
+ *
+ * helper function to free resources allocated by create_trip_attrs()
+ */
+static void destroy_trip_attrs(struct thermal_zone_device *tz)
+{
+ if (!tz)
+ return;
+
+ kfree(tz->trip_type_attrs);
+ kfree(tz->trip_temp_attrs);
+ if (tz->ops->get_trip_hyst)
+ kfree(tz->trip_hyst_attrs);
+ kfree(tz->trips_attribute_group.attrs);
+}
+
+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->num_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;
+}
+
+void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
+{
+ if (!tz)
+ return;
+
+ if (tz->num_trips)
+ destroy_trip_attrs(tz);
+
+ kfree(tz->device.groups);
+}
+
+/* sys I/F for cooling device */
+static ssize_t
+cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+
+ return sprintf(buf, "%s\n", cdev->type);
+}
+
+static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+
+ return sprintf(buf, "%ld\n", cdev->max_state);
+}
+
+static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+ unsigned long state;
+ int ret;
+
+ ret = cdev->ops->get_cur_state(cdev, &state);
+ if (ret)
+ return ret;
+ return sprintf(buf, "%ld\n", state);
+}
+
+static ssize_t
+cur_state_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+ unsigned long state;
+ int result;
+
+ if (sscanf(buf, "%ld\n", &state) != 1)
+ return -EINVAL;
+
+ if ((long)state < 0)
+ return -EINVAL;
+
+ /* Requested state should be less than max_state + 1 */
+ if (state > cdev->max_state)
+ return -EINVAL;
+
+ mutex_lock(&cdev->lock);
+
+ result = cdev->ops->set_cur_state(cdev, state);
+ if (!result)
+ thermal_cooling_device_stats_update(cdev, state);
+
+ mutex_unlock(&cdev->lock);
+ return result ? result : count;
+}
+
+static struct device_attribute
+dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
+static DEVICE_ATTR_RO(max_state);
+static DEVICE_ATTR_RW(cur_state);
+
+static struct attribute *cooling_device_attrs[] = {
+ &dev_attr_cdev_type.attr,
+ &dev_attr_max_state.attr,
+ &dev_attr_cur_state.attr,
+ NULL,
+};
+
+static const struct attribute_group cooling_device_attr_group = {
+ .attrs = cooling_device_attrs,
+};
+
+static const struct attribute_group *cooling_device_attr_groups[] = {
+ &cooling_device_attr_group,
+ NULL, /* Space allocated for cooling_device_stats_attr_group */
+ NULL,
+};
+
+#ifdef CONFIG_THERMAL_STATISTICS
+struct cooling_dev_stats {
+ spinlock_t lock;
+ unsigned int total_trans;
+ unsigned long state;
+ unsigned long max_states;
+ ktime_t last_time;
+ ktime_t *time_in_state;
+ unsigned int *trans_table;
+};
+
+static void update_time_in_state(struct cooling_dev_stats *stats)
+{
+ ktime_t now = ktime_get(), delta;
+
+ delta = ktime_sub(now, stats->last_time);
+ stats->time_in_state[stats->state] =
+ ktime_add(stats->time_in_state[stats->state], delta);
+ stats->last_time = now;
+}
+
+void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
+ unsigned long new_state)
+{
+ struct cooling_dev_stats *stats = cdev->stats;
+
+ if (!stats)
+ return;
+
+ spin_lock(&stats->lock);
+
+ if (stats->state == new_state)
+ goto unlock;
+
+ update_time_in_state(stats);
+ stats->trans_table[stats->state * stats->max_states + new_state]++;
+ stats->state = new_state;
+ stats->total_trans++;
+
+unlock:
+ spin_unlock(&stats->lock);
+}
+
+static ssize_t total_trans_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+ struct cooling_dev_stats *stats = cdev->stats;
+ int ret;
+
+ spin_lock(&stats->lock);
+ ret = sprintf(buf, "%u\n", stats->total_trans);
+ spin_unlock(&stats->lock);
+
+ return ret;
+}
+
+static ssize_t
+time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+ struct cooling_dev_stats *stats = cdev->stats;
+ ssize_t len = 0;
+ int i;
+
+ spin_lock(&stats->lock);
+ update_time_in_state(stats);
+
+ for (i = 0; i < stats->max_states; i++) {
+ len += sprintf(buf + len, "state%u\t%llu\n", i,
+ ktime_to_ms(stats->time_in_state[i]));
+ }
+ spin_unlock(&stats->lock);
+
+ return len;
+}
+
+static ssize_t
+reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+ struct cooling_dev_stats *stats = cdev->stats;
+ int i, states = stats->max_states;
+
+ spin_lock(&stats->lock);
+
+ stats->total_trans = 0;
+ stats->last_time = ktime_get();
+ memset(stats->trans_table, 0,
+ states * states * sizeof(*stats->trans_table));
+
+ for (i = 0; i < stats->max_states; i++)
+ stats->time_in_state[i] = ktime_set(0, 0);
+
+ spin_unlock(&stats->lock);
+
+ return count;
+}
+
+static ssize_t trans_table_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct thermal_cooling_device *cdev = to_cooling_device(dev);
+ struct cooling_dev_stats *stats = cdev->stats;
+ ssize_t len = 0;
+ int i, j;
+
+ len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
+ len += snprintf(buf + len, PAGE_SIZE - len, " : ");
+ for (i = 0; i < stats->max_states; i++) {
+ if (len >= PAGE_SIZE)
+ break;
+ len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i);
+ }
+ if (len >= PAGE_SIZE)
+ return PAGE_SIZE;
+
+ len += snprintf(buf + len, PAGE_SIZE - len, "\n");
+
+ for (i = 0; i < stats->max_states; i++) {
+ if (len >= PAGE_SIZE)
+ break;
+
+ len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
+
+ for (j = 0; j < stats->max_states; j++) {
+ if (len >= PAGE_SIZE)
+ break;
+ len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
+ stats->trans_table[i * stats->max_states + j]);
+ }
+ if (len >= PAGE_SIZE)
+ break;
+ len += snprintf(buf + len, PAGE_SIZE - len, "\n");
+ }
+
+ if (len >= PAGE_SIZE) {
+ pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
+ return -EFBIG;
+ }
+ return len;
+}
+
+static DEVICE_ATTR_RO(total_trans);
+static DEVICE_ATTR_RO(time_in_state_ms);
+static DEVICE_ATTR_WO(reset);
+static DEVICE_ATTR_RO(trans_table);
+
+static struct attribute *cooling_device_stats_attrs[] = {
+ &dev_attr_total_trans.attr,
+ &dev_attr_time_in_state_ms.attr,
+ &dev_attr_reset.attr,
+ &dev_attr_trans_table.attr,
+ NULL
+};
+
+static const struct attribute_group cooling_device_stats_attr_group = {
+ .attrs = cooling_device_stats_attrs,
+ .name = "stats"
+};
+
+static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
+{
+ const struct attribute_group *stats_attr_group = NULL;
+ struct cooling_dev_stats *stats;
+ unsigned long states;
+ int var;
+
+ if (cdev->ops->get_max_state(cdev, &states))
+ goto out;
+
+ states++; /* Total number of states is highest state + 1 */
+
+ var = sizeof(*stats);
+ var += sizeof(*stats->time_in_state) * states;
+ var += sizeof(*stats->trans_table) * states * states;
+
+ stats = kzalloc(var, GFP_KERNEL);
+ if (!stats)
+ goto out;
+
+ stats->time_in_state = (ktime_t *)(stats + 1);
+ stats->trans_table = (unsigned int *)(stats->time_in_state + states);
+ cdev->stats = stats;
+ stats->last_time = ktime_get();
+ stats->max_states = states;
+
+ spin_lock_init(&stats->lock);
+
+ stats_attr_group = &cooling_device_stats_attr_group;
+
+out:
+ /* Fill the empty slot left in cooling_device_attr_groups */
+ var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
+ cooling_device_attr_groups[var] = stats_attr_group;
+}
+
+static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
+{
+ kfree(cdev->stats);
+ cdev->stats = NULL;
+}
+
+#else
+
+static inline void
+cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
+static inline void
+cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
+
+#endif /* CONFIG_THERMAL_STATISTICS */
+
+void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
+{
+ cooling_device_stats_setup(cdev);
+ cdev->device.groups = cooling_device_attr_groups;
+}
+
+void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
+{
+ cooling_device_stats_destroy(cdev);
+}
+
+/* these helper will be used only at the time of bindig */
+ssize_t
+trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct thermal_instance *instance;
+
+ instance =
+ container_of(attr, struct thermal_instance, attr);
+
+ return sprintf(buf, "%d\n", instance->trip);
+}
+
+ssize_t
+weight_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct thermal_instance *instance;
+
+ instance = container_of(attr, struct thermal_instance, weight_attr);
+
+ return sprintf(buf, "%d\n", instance->weight);
+}
+
+ssize_t weight_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct thermal_instance *instance;
+ int ret, weight;
+
+ ret = kstrtoint(buf, 0, &weight);
+ if (ret)
+ return ret;
+
+ instance = container_of(attr, struct thermal_instance, weight_attr);
+ instance->weight = weight;
+
+ return count;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 09:41:16 +0000