| // 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); |
| unsigned long state; |
| int ret; |
| |
| ret = cdev->ops->get_max_state(cdev, &state); |
| if (ret) |
| return ret; |
| return sprintf(buf, "%ld\n", 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; |
| |
| 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; |
| } |