diff options
Diffstat (limited to 'drivers/thermal/thermal_sysfs.c')
| -rw-r--r-- | drivers/thermal/thermal_sysfs.c | 880 |
1 files changed, 880 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c new file mode 100644 index 000000000..b44abfc99 --- /dev/null +++ b/drivers/thermal/thermal_sysfs.c @@ -0,0 +1,880 @@ +// 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/container_of.h> +#include <linux/sysfs.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/string_choices.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 sysfs_emit(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 sysfs_emit(buf, "%d\n", temperature); + + if (ret == -EAGAIN) + return -ENODATA; + + return ret; +} + +static ssize_t +mode_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + + guard(thermal_zone)(tz); + + return sysfs_emit(buf, "%s\n", + str_enabled_disabled(tz->mode == THERMAL_DEVICE_ENABLED)); +} + +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; +} + +#define thermal_trip_of_attr(_ptr_, _attr_) \ + ({ \ + struct thermal_trip_desc *td; \ + \ + td = container_of(_ptr_, struct thermal_trip_desc, \ + trip_attrs._attr_.attr); \ + &td->trip; \ + }) + +static ssize_t +trip_point_type_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct thermal_trip *trip = thermal_trip_of_attr(attr, type); + + return sysfs_emit(buf, "%s\n", thermal_trip_type_name(trip->type)); +} + +static ssize_t +trip_point_temp_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct thermal_trip *trip = thermal_trip_of_attr(attr, temp); + struct thermal_zone_device *tz = to_thermal_zone(dev); + int temp; + + if (kstrtoint(buf, 10, &temp)) + return -EINVAL; + + guard(thermal_zone)(tz); + + if (temp == trip->temperature) + return count; + + /* Arrange the condition to avoid integer overflows. */ + if (temp != THERMAL_TEMP_INVALID && + temp <= trip->hysteresis + THERMAL_TEMP_INVALID) + return -EINVAL; + + if (tz->ops.set_trip_temp) { + int ret; + + ret = tz->ops.set_trip_temp(tz, trip, temp); + if (ret) + return ret; + } + + thermal_zone_set_trip_temp(tz, trip, temp); + + __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED); + + return count; +} + +static ssize_t +trip_point_temp_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct thermal_trip *trip = thermal_trip_of_attr(attr, temp); + + return sysfs_emit(buf, "%d\n", READ_ONCE(trip->temperature)); +} + +static ssize_t +trip_point_hyst_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct thermal_trip *trip = thermal_trip_of_attr(attr, hyst); + struct thermal_zone_device *tz = to_thermal_zone(dev); + int hyst; + + if (kstrtoint(buf, 10, &hyst) || hyst < 0) + return -EINVAL; + + guard(thermal_zone)(tz); + + if (hyst == trip->hysteresis) + return count; + + /* + * Allow the hysteresis to be updated when the temperature is invalid + * to allow user space to avoid having to adjust hysteresis after a + * valid temperature has been set, but in that case just change the + * value and do nothing else. + */ + if (trip->temperature == THERMAL_TEMP_INVALID) { + WRITE_ONCE(trip->hysteresis, hyst); + return count; + } + + if (trip->temperature - hyst <= THERMAL_TEMP_INVALID) + return -EINVAL; + + thermal_zone_set_trip_hyst(tz, trip, hyst); + + __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED); + + return count; +} + +static ssize_t +trip_point_hyst_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct thermal_trip *trip = thermal_trip_of_attr(attr, hyst); + + return sysfs_emit(buf, "%d\n", READ_ONCE(trip->hysteresis)); +} + +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; + + strscpy(name, 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 sysfs_emit(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 temperature; + + if (kstrtoint(buf, 10, &temperature)) + return -EINVAL; + + guard(thermal_zone)(tz); + + if (tz->ops.set_emul_temp) { + int ret; + + ret = tz->ops.set_emul_temp(tz, temperature); + if (ret) + return ret; + } else { + tz->emul_temperature = temperature; + } + + __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); + + return 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 sysfs_emit(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 sysfs_emit(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 + * + * 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) +{ + struct thermal_trip_desc *td; + struct attribute **attrs; + int i; + + attrs = kzalloc_objs(*attrs, tz->num_trips * 3 + 1); + if (!attrs) + return -ENOMEM; + + i = 0; + for_each_trip_desc(tz, td) { + struct thermal_trip_attrs *trip_attrs = &td->trip_attrs; + + /* create trip type attribute */ + snprintf(trip_attrs->type.name, THERMAL_NAME_LENGTH, + "trip_point_%d_type", i); + + sysfs_attr_init(&trip_attrs->type.attr.attr); + trip_attrs->type.attr.attr.name = trip_attrs->type.name; + trip_attrs->type.attr.attr.mode = S_IRUGO; + trip_attrs->type.attr.show = trip_point_type_show; + attrs[i] = &trip_attrs->type.attr.attr; + + /* create trip temp attribute */ + snprintf(trip_attrs->temp.name, THERMAL_NAME_LENGTH, + "trip_point_%d_temp", i); + + sysfs_attr_init(&trip_attrs->temp.attr.attr); + trip_attrs->temp.attr.attr.name = trip_attrs->temp.name; + trip_attrs->temp.attr.attr.mode = S_IRUGO; + trip_attrs->temp.attr.show = trip_point_temp_show; + if (td->trip.flags & THERMAL_TRIP_FLAG_RW_TEMP) { + trip_attrs->temp.attr.attr.mode |= S_IWUSR; + trip_attrs->temp.attr.store = trip_point_temp_store; + } + attrs[i + tz->num_trips] = &trip_attrs->temp.attr.attr; + + snprintf(trip_attrs->hyst.name, THERMAL_NAME_LENGTH, + "trip_point_%d_hyst", i); + + sysfs_attr_init(&trip_attrs->hyst.attr.attr); + trip_attrs->hyst.attr.attr.name = trip_attrs->hyst.name; + trip_attrs->hyst.attr.attr.mode = S_IRUGO; + trip_attrs->hyst.attr.show = trip_point_hyst_show; + if (td->trip.flags & THERMAL_TRIP_FLAG_RW_HYST) { + trip_attrs->hyst.attr.attr.mode |= S_IWUSR; + trip_attrs->hyst.attr.store = trip_point_hyst_store; + } + attrs[i + 2 * tz->num_trips] = &trip_attrs->hyst.attr.attr; + i++; + } + 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) + kfree(tz->trips_attribute_group.attrs); +} + +int thermal_zone_create_device_groups(struct thermal_zone_device *tz) +{ + 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 = kzalloc_objs(*groups, size); + 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); + 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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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; + + result = kstrtoul(buf, 10, &state); + if (result < 0) + return result; + + /* Requested state should be less than max_state + 1 */ + if (state > cdev->max_state) + return -EINVAL; + + guard(cooling_dev)(cdev); + + result = cdev->ops->set_cur_state(cdev, state); + if (result) + return result; + + thermal_cooling_device_stats_update(cdev, state); + + return 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; + 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; + + lockdep_assert_held(&cdev->lock); + + if (!stats) + return; + + spin_lock(&stats->lock); + + if (stats->state == new_state) + goto unlock; + + update_time_in_state(stats); + stats->trans_table[stats->state * (cdev->max_state + 1) + 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; + int ret; + + guard(cooling_dev)(cdev); + + stats = cdev->stats; + if (!stats) + return 0; + + spin_lock(&stats->lock); + ret = sysfs_emit(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; + ssize_t len = 0; + int i; + + guard(cooling_dev)(cdev); + + stats = cdev->stats; + if (!stats) + return 0; + + spin_lock(&stats->lock); + + update_time_in_state(stats); + + for (i = 0; i <= cdev->max_state; i++) { + len += sysfs_emit_at(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; + int i, states; + + guard(cooling_dev)(cdev); + + stats = cdev->stats; + if (!stats) + return count; + + states = cdev->max_state + 1; + + 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 < 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; + ssize_t len = 0; + int i, j; + + guard(cooling_dev)(cdev); + + stats = cdev->stats; + if (!stats) + return -ENODATA; + + len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); + len += snprintf(buf + len, PAGE_SIZE - len, " : "); + for (i = 0; i <= cdev->max_state; 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 <= cdev->max_state; i++) { + if (len >= PAGE_SIZE) + break; + + len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i); + + for (j = 0; j <= cdev->max_state; j++) { + if (len >= PAGE_SIZE) + break; + len += snprintf(buf + len, PAGE_SIZE - len, "%8u ", + stats->trans_table[i * (cdev->max_state + 1) + 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"); + len = -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; + /* Total number of states is highest state + 1 */ + unsigned long states = cdev->max_state + 1; + int var; + + 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(); + + 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); +} + +void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev) +{ + lockdep_assert_held(&cdev->lock); + + cooling_device_stats_destroy(cdev); + cooling_device_stats_setup(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_zone_device *tz = to_thermal_zone(dev); + struct thermal_instance *instance; + + instance = container_of(attr, struct thermal_instance, attr); + + return sysfs_emit(buf, "%d\n", thermal_zone_trip_id(tz, 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 sysfs_emit(buf, "%d\n", instance->weight); +} + +ssize_t weight_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + 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); + + /* Don't race with governors using the 'weight' value */ + guard(thermal_zone)(tz); + + instance->weight = weight; + + thermal_governor_update_tz(tz, THERMAL_INSTANCE_WEIGHT_CHANGED); + + return count; +} |