/* * thermal.c - Generic Thermal Management Sysfs support. * * Copyright (C) 2008 Intel Corp * Copyright (C) 2008 Zhang Rui * Copyright (C) 2008 Sujith Thomas * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Zhang Rui"); MODULE_DESCRIPTION("Generic thermal management sysfs support"); MODULE_LICENSE("GPL"); #define PREFIX "Thermal: " struct thermal_cooling_device_instance { int id; char name[THERMAL_NAME_LENGTH]; struct thermal_zone_device *tz; struct thermal_cooling_device *cdev; int trip; char attr_name[THERMAL_NAME_LENGTH]; struct device_attribute attr; struct list_head node; }; static DEFINE_IDR(thermal_tz_idr); static DEFINE_IDR(thermal_cdev_idr); static DEFINE_MUTEX(thermal_idr_lock); static LIST_HEAD(thermal_tz_list); static LIST_HEAD(thermal_cdev_list); static DEFINE_MUTEX(thermal_list_lock); static int get_idr(struct idr *idr, struct mutex *lock, int *id) { int err; again: if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0)) return -ENOMEM; if (lock) mutex_lock(lock); err = idr_get_new(idr, NULL, id); if (lock) mutex_unlock(lock); if (unlikely(err == -EAGAIN)) goto again; else if (unlikely(err)) return err; *id = *id & MAX_ID_MASK; return 0; } static void release_idr(struct idr *idr, struct mutex *lock, int id) { if (lock) mutex_lock(lock); idr_remove(idr, id); if (lock) mutex_unlock(lock); } /* sys I/F for thermal zone */ #define to_thermal_zone(_dev) \ container_of(_dev, struct thermal_zone_device, device) 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); long temperature; int ret; if (!tz->ops->get_temp) return -EPERM; ret = tz->ops->get_temp(tz, &temperature); if (ret) return ret; return sprintf(buf, "%ld\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"))) result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED); else if (!strncmp(buf, "disabled", sizeof("disabled"))) 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)) 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_show(struct device *dev, struct device_attribute *attr, char *buf) { struct thermal_zone_device *tz = to_thermal_zone(dev); int trip, ret; long temperature; if (!tz->ops->get_trip_temp) return -EPERM; if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) return -EINVAL; ret = tz->ops->get_trip_temp(tz, trip, &temperature); if (ret) return ret; return sprintf(buf, "%ld\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); struct thermal_cooling_device *cdev = NULL; int state; if (!sscanf(buf, "%d\n", &state)) 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) { mutex_lock(&thermal_list_lock); list_for_each_entry(cdev, &thermal_cdev_list, node) { if (!strncmp("Processor", cdev->type, sizeof("Processor"))) thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev); } mutex_unlock(&thermal_list_lock); if (!tz->passive_delay) tz->passive_delay = 1000; } else if (!state && tz->forced_passive) { mutex_lock(&thermal_list_lock); list_for_each_entry(cdev, &thermal_cdev_list, node) { if (!strncmp("Processor", cdev->type, sizeof("Processor"))) thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev); } mutex_unlock(&thermal_list_lock); tz->passive_delay = 0; } tz->tc1 = 1; tz->tc2 = 1; tz->forced_passive = state; thermal_zone_device_update(tz); 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 DEVICE_ATTR(type, 0444, type_show, NULL); static DEVICE_ATTR(temp, 0444, temp_show, NULL); static DEVICE_ATTR(mode, 0644, mode_show, mode_store); static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \ passive_store); static struct device_attribute trip_point_attrs[] = { __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL), __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL), __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL), }; #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \ do { \ result = device_create_file(_dev, \ &trip_point_attrs[_index * 2]); \ if (result) \ break; \ result = device_create_file(_dev, \ &trip_point_attrs[_index * 2 + 1]); \ } while (0) #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \ do { \ device_remove_file(_dev, &trip_point_attrs[_index * 2]); \ device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \ } while (0) /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ container_of(_dev, struct thermal_cooling_device, device) static ssize_t thermal_cooling_device_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 thermal_cooling_device_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 thermal_cooling_device_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 thermal_cooling_device_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)) return -EINVAL; if ((long)state < 0) return -EINVAL; result = cdev->ops->set_cur_state(cdev, state); if (result) return result; return count; } static struct device_attribute dev_attr_cdev_type = __ATTR(type, 0444, thermal_cooling_device_type_show, NULL); static DEVICE_ATTR(max_state, 0444, thermal_cooling_device_max_state_show, NULL); static DEVICE_ATTR(cur_state, 0644, thermal_cooling_device_cur_state_show, thermal_cooling_device_cur_state_store); static ssize_t thermal_cooling_device_trip_point_show(struct device *dev, struct device_attribute *attr, char *buf) { struct thermal_cooling_device_instance *instance; instance = container_of(attr, struct thermal_cooling_device_instance, attr); if (instance->trip == THERMAL_TRIPS_NONE) return sprintf(buf, "-1\n"); else return sprintf(buf, "%d\n", instance->trip); } /* Device management */ #if defined(CONFIG_THERMAL_HWMON) /* hwmon sys I/F */ #include static LIST_HEAD(thermal_hwmon_list); static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev); return sprintf(buf, "%s\n", hwmon->type); } static DEVICE_ATTR(name, 0444, name_show, NULL); static ssize_t temp_input_show(struct device *dev, struct device_attribute *attr, char *buf) { long temperature; int ret; struct thermal_hwmon_attr *hwmon_attr = container_of(attr, struct thermal_hwmon_attr, attr); struct thermal_zone_device *tz = container_of(hwmon_attr, struct thermal_zone_device, temp_input); ret = tz->ops->get_temp(tz, &temperature); if (ret) return ret; return sprintf(buf, "%ld\n", temperature); } static ssize_t temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf) { struct thermal_hwmon_attr *hwmon_attr = container_of(attr, struct thermal_hwmon_attr, attr); struct thermal_zone_device *tz = container_of(hwmon_attr, struct thermal_zone_device, temp_crit); long temperature; int ret; ret = tz->ops->get_trip_temp(tz, 0, &temperature); if (ret) return ret; return sprintf(buf, "%ld\n", temperature); } static int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) { struct thermal_hwmon_device *hwmon; int new_hwmon_device = 1; int result; mutex_lock(&thermal_list_lock); list_for_each_entry(hwmon, &thermal_hwmon_list, node) if (!strcmp(hwmon->type, tz->type)) { new_hwmon_device = 0; mutex_unlock(&thermal_list_lock); goto register_sys_interface; } mutex_unlock(&thermal_list_lock); hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL); if (!hwmon) return -ENOMEM; INIT_LIST_HEAD(&hwmon->tz_list); strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH); hwmon->device = hwmon_device_register(NULL); if (IS_ERR(hwmon->device)) { result = PTR_ERR(hwmon->device); goto free_mem; } dev_set_drvdata(hwmon->device, hwmon); result = device_create_file(hwmon->device, &dev_attr_name); if (result) goto unregister_hwmon_device; register_sys_interface: tz->hwmon = hwmon; hwmon->count++; snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH, "temp%d_input", hwmon->count); tz->temp_input.attr.attr.name = tz->temp_input.name; tz->temp_input.attr.attr.mode = 0444; tz->temp_input.attr.show = temp_input_show; sysfs_attr_init(&tz->temp_input.attr.attr); result = device_create_file(hwmon->device, &tz->temp_input.attr); if (result) goto unregister_hwmon_device; if (tz->ops->get_crit_temp) { unsigned long temperature; if (!tz->ops->get_crit_temp(tz, &temperature)) { snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH, "temp%d_crit", hwmon->count); tz->temp_crit.attr.attr.name = tz->temp_crit.name; tz->temp_crit.attr.attr.mode = 0444; tz->temp_crit.attr.show = temp_crit_show; sysfs_attr_init(&tz->temp_crit.attr.attr); result = device_create_file(hwmon->device, &tz->temp_crit.attr); if (result) goto unregister_hwmon_device; } } mutex_lock(&thermal_list_lock); if (new_hwmon_device) list_add_tail(&hwmon->node, &thermal_hwmon_list); list_add_tail(&tz->hwmon_node, &hwmon->tz_list); mutex_unlock(&thermal_list_lock); return 0; unregister_hwmon_device: device_remove_file(hwmon->device, &tz->temp_crit.attr); device_remove_file(hwmon->device, &tz->temp_input.attr); if (new_hwmon_device) { device_remove_file(hwmon->device, &dev_attr_name); hwmon_device_unregister(hwmon->device); } free_mem: if (new_hwmon_device) kfree(hwmon); return result; } static void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) { struct thermal_hwmon_device *hwmon = tz->hwmon; tz->hwmon = NULL; device_remove_file(hwmon->device, &tz->temp_input.attr); device_remove_file(hwmon->device, &tz->temp_crit.attr); mutex_lock(&thermal_list_lock); list_del(&tz->hwmon_node); if (!list_empty(&hwmon->tz_list)) { mutex_unlock(&thermal_list_lock); return; } list_del(&hwmon->node); mutex_unlock(&thermal_list_lock); device_remove_file(hwmon->device, &dev_attr_name); hwmon_device_unregister(hwmon->device); kfree(hwmon); } #else static int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) { return 0; } static void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) { } #endif static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, int delay) { cancel_delayed_work(&(tz->poll_queue)); if (!delay) return; if (delay > 1000) schedule_delayed_work(&(tz->poll_queue), round_jiffies(msecs_to_jiffies(delay))); else schedule_delayed_work(&(tz->poll_queue), msecs_to_jiffies(delay)); } static void thermal_zone_device_passive(struct thermal_zone_device *tz, int temp, int trip_temp, int trip) { int trend = 0; struct thermal_cooling_device_instance *instance; struct thermal_cooling_device *cdev; long state, max_state; /* * Above Trip? * ----------- * Calculate the thermal trend (using the passive cooling equation) * and modify the performance limit for all passive cooling devices * accordingly. Note that we assume symmetry. */ if (temp >= trip_temp) { tz->passive = true; trend = (tz->tc1 * (temp - tz->last_temperature)) + (tz->tc2 * (temp - trip_temp)); /* Heating up? */ if (trend > 0) { list_for_each_entry(instance, &tz->cooling_devices, node) { if (instance->trip != trip) continue; cdev = instance->cdev; cdev->ops->get_cur_state(cdev, &state); cdev->ops->get_max_state(cdev, &max_state); if (state++ < max_state) cdev->ops->set_cur_state(cdev, state); } } else if (trend < 0) { /* Cooling off? */ list_for_each_entry(instance, &tz->cooling_devices, node) { if (instance->trip != trip) continue; cdev = instance->cdev; cdev->ops->get_cur_state(cdev, &state); cdev->ops->get_max_state(cdev, &max_state); if (state > 0) cdev->ops->set_cur_state(cdev, --state); } } return; } /* * Below Trip? * ----------- * Implement passive cooling hysteresis to slowly increase performance * and avoid thrashing around the passive trip point. Note that we * assume symmetry. */ list_for_each_entry(instance, &tz->cooling_devices, node) { if (instance->trip != trip) continue; cdev = instance->cdev; cdev->ops->get_cur_state(cdev, &state); cdev->ops->get_max_state(cdev, &max_state); if (state > 0) cdev->ops->set_cur_state(cdev, --state); if (state == 0) tz->passive = false; } } static void thermal_zone_device_check(struct work_struct *work) { struct thermal_zone_device *tz = container_of(work, struct thermal_zone_device, poll_queue.work); thermal_zone_device_update(tz); } /** * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone * @tz: thermal zone device * @trip: indicates which trip point the cooling devices is * associated with in this thermal zone. * @cdev: thermal cooling device * * This function is usually called in the thermal zone device .bind callback. */ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, int trip, struct thermal_cooling_device *cdev) { struct thermal_cooling_device_instance *dev; struct thermal_cooling_device_instance *pos; struct thermal_zone_device *pos1; struct thermal_cooling_device *pos2; int result; if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) return -EINVAL; list_for_each_entry(pos1, &thermal_tz_list, node) { if (pos1 == tz) break; } list_for_each_entry(pos2, &thermal_cdev_list, node) { if (pos2 == cdev) break; } if (tz != pos1 || cdev != pos2) return -EINVAL; dev = kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL); if (!dev) return -ENOMEM; dev->tz = tz; dev->cdev = cdev; dev->trip = trip; result = get_idr(&tz->idr, &tz->lock, &dev->id); if (result) goto free_mem; sprintf(dev->name, "cdev%d", dev->id); result = sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); if (result) goto release_idr; sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); sysfs_attr_init(&dev->attr.attr); dev->attr.attr.name = dev->attr_name; dev->attr.attr.mode = 0444; dev->attr.show = thermal_cooling_device_trip_point_show; result = device_create_file(&tz->device, &dev->attr); if (result) goto remove_symbol_link; mutex_lock(&tz->lock); list_for_each_entry(pos, &tz->cooling_devices, node) if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { result = -EEXIST; break; } if (!result) list_add_tail(&dev->node, &tz->cooling_devices); mutex_unlock(&tz->lock); if (!result) return 0; device_remove_file(&tz->device, &dev->attr); remove_symbol_link: sysfs_remove_link(&tz->device.kobj, dev->name); release_idr: release_idr(&tz->idr, &tz->lock, dev->id); free_mem: kfree(dev); return result; } EXPORT_SYMBOL(thermal_zone_bind_cooling_device); /** * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone * @tz: thermal zone device * @trip: indicates which trip point the cooling devices is * associated with in this thermal zone. * @cdev: thermal cooling device * * This function is usually called in the thermal zone device .unbind callback. */ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, int trip, struct thermal_cooling_device *cdev) { struct thermal_cooling_device_instance *pos, *next; mutex_lock(&tz->lock); list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) { if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { list_del(&pos->node); mutex_unlock(&tz->lock); goto unbind; } } mutex_unlock(&tz->lock); return -ENODEV; unbind: device_remove_file(&tz->device, &pos->attr); sysfs_remove_link(&tz->device.kobj, pos->name); release_idr(&tz->idr, &tz->lock, pos->id); kfree(pos); return 0; } EXPORT_SYMBOL(thermal_zone_unbind_cooling_device); static void thermal_release(struct device *dev) { struct thermal_zone_device *tz; struct thermal_cooling_device *cdev; if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) { tz = to_thermal_zone(dev); kfree(tz); } else { cdev = to_cooling_device(dev); kfree(cdev); } } static struct class thermal_class = { .name = "thermal", .dev_release = thermal_release, }; /** * thermal_cooling_device_register - register a new thermal cooling device * @type: the thermal cooling device type. * @devdata: device private data. * @ops: standard thermal cooling devices callbacks. */ struct thermal_cooling_device *thermal_cooling_device_register( char *type, void *devdata, const struct thermal_cooling_device_ops *ops) { struct thermal_cooling_device *cdev; struct thermal_zone_device *pos; int result; if (strlen(type) >= THERMAL_NAME_LENGTH) return ERR_PTR(-EINVAL); if (!ops || !ops->get_max_state || !ops->get_cur_state || !ops->set_cur_state) return ERR_PTR(-EINVAL); cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL); if (!cdev) return ERR_PTR(-ENOMEM); result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id); if (result) { kfree(cdev); return ERR_PTR(result); } strcpy(cdev->type, type); cdev->ops = ops; cdev->device.class = &thermal_class; cdev->devdata = devdata; dev_set_name(&cdev->device, "cooling_device%d", cdev->id); result = device_register(&cdev->device); if (result) { release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); kfree(cdev); return ERR_PTR(result); } /* sys I/F */ if (type) { result = device_create_file(&cdev->device, &dev_attr_cdev_type); if (result) goto unregister; } result = device_create_file(&cdev->device, &dev_attr_max_state); if (result) goto unregister; result = device_create_file(&cdev->device, &dev_attr_cur_state); if (result) goto unregister; mutex_lock(&thermal_list_lock); list_add(&cdev->node, &thermal_cdev_list); list_for_each_entry(pos, &thermal_tz_list, node) { if (!pos->ops->bind) continue; result = pos->ops->bind(pos, cdev); if (result) break; } mutex_unlock(&thermal_list_lock); if (!result) return cdev; unregister: release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); device_unregister(&cdev->device); return ERR_PTR(result); } EXPORT_SYMBOL(thermal_cooling_device_register); /** * thermal_cooling_device_unregister - removes the registered thermal cooling device * @cdev: the thermal cooling device to remove. * * thermal_cooling_device_unregister() must be called when the device is no * longer needed. */ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) { struct thermal_zone_device *tz; struct thermal_cooling_device *pos = NULL; if (!cdev) return; mutex_lock(&thermal_list_lock); list_for_each_entry(pos, &thermal_cdev_list, node) if (pos == cdev) break; if (pos != cdev) { /* thermal cooling device not found */ mutex_unlock(&thermal_list_lock); return; } list_del(&cdev->node); list_for_each_entry(tz, &thermal_tz_list, node) { if (!tz->ops->unbind) continue; tz->ops->unbind(tz, cdev); } mutex_unlock(&thermal_list_lock); if (cdev->type[0]) device_remove_file(&cdev->device, &dev_attr_cdev_type); device_remove_file(&cdev->device, &dev_attr_max_state); device_remove_file(&cdev->device, &dev_attr_cur_state); release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); device_unregister(&cdev->device); return; } EXPORT_SYMBOL(thermal_cooling_device_unregister); /** * thermal_zone_device_update - force an update of a thermal zone's state * @ttz: the thermal zone to update */ void thermal_zone_device_update(struct thermal_zone_device *tz) { int count, ret = 0; long temp, trip_temp; enum thermal_trip_type trip_type; struct thermal_cooling_device_instance *instance; struct thermal_cooling_device *cdev; mutex_lock(&tz->lock); if (tz->ops->get_temp(tz, &temp)) { /* get_temp failed - retry it later */ printk(KERN_WARNING PREFIX "failed to read out thermal zone " "%d\n", tz->id); goto leave; } for (count = 0; count < tz->trips; count++) { tz->ops->get_trip_type(tz, count, &trip_type); tz->ops->get_trip_temp(tz, count, &trip_temp); switch (trip_type) { case THERMAL_TRIP_CRITICAL: if (temp >= trip_temp) { if (tz->ops->notify) ret = tz->ops->notify(tz, count, trip_type); if (!ret) { printk(KERN_EMERG "Critical temperature reached (%ld C), shutting down.\n", temp/1000); orderly_poweroff(true); } } break; case THERMAL_TRIP_HOT: if (temp >= trip_temp) if (tz->ops->notify) tz->ops->notify(tz, count, trip_type); break; case THERMAL_TRIP_ACTIVE: list_for_each_entry(instance, &tz->cooling_devices, node) { if (instance->trip != count) continue; cdev = instance->cdev; if (temp >= trip_temp) cdev->ops->set_cur_state(cdev, 1); else cdev->ops->set_cur_state(cdev, 0); } break; case THERMAL_TRIP_PASSIVE: if (temp >= trip_temp || tz->passive) thermal_zone_device_passive(tz, temp, trip_temp, count); break; } } if (tz->forced_passive) thermal_zone_device_passive(tz, temp, tz->forced_passive, THERMAL_TRIPS_NONE); tz->last_temperature = temp; leave: if (tz->passive) thermal_zone_device_set_polling(tz, tz->passive_delay); else if (tz->polling_delay) thermal_zone_device_set_polling(tz, tz->polling_delay); else thermal_zone_device_set_polling(tz, 0); mutex_unlock(&tz->lock); } EXPORT_SYMBOL(thermal_zone_device_update); /** * thermal_zone_device_register - register a new thermal zone device * @type: the thermal zone device type * @trips: the number of trip points the thermal zone support * @devdata: private device data * @ops: standard thermal zone device callbacks * @tc1: thermal coefficient 1 for passive calculations * @tc2: thermal coefficient 2 for passive calculations * @passive_delay: number of milliseconds to wait between polls when * performing passive cooling * @polling_delay: number of milliseconds to wait between polls when checking * whether trip points have been crossed (0 for interrupt * driven systems) * * thermal_zone_device_unregister() must be called when the device is no * longer needed. The passive cooling formula uses tc1 and tc2 as described in * section 11.1.5.1 of the ACPI specification 3.0. */ struct thermal_zone_device *thermal_zone_device_register(char *type, int trips, void *devdata, const struct thermal_zone_device_ops *ops, int tc1, int tc2, int passive_delay, int polling_delay) { struct thermal_zone_device *tz; struct thermal_cooling_device *pos; enum thermal_trip_type trip_type; int result; int count; int passive = 0; if (strlen(type) >= THERMAL_NAME_LENGTH) return ERR_PTR(-EINVAL); if (trips > THERMAL_MAX_TRIPS || trips < 0) return ERR_PTR(-EINVAL); if (!ops || !ops->get_temp) return ERR_PTR(-EINVAL); tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL); if (!tz) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&tz->cooling_devices); idr_init(&tz->idr); mutex_init(&tz->lock); result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id); if (result) { kfree(tz); return ERR_PTR(result); } strcpy(tz->type, type); tz->ops = ops; tz->device.class = &thermal_class; tz->devdata = devdata; tz->trips = trips; tz->tc1 = tc1; tz->tc2 = tc2; tz->passive_delay = passive_delay; tz->polling_delay = polling_delay; dev_set_name(&tz->device, "thermal_zone%d", tz->id); result = device_register(&tz->device); if (result) { release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); kfree(tz); return ERR_PTR(result); } /* sys I/F */ if (type) { result = device_create_file(&tz->device, &dev_attr_type); if (result) goto unregister; } result = device_create_file(&tz->device, &dev_attr_temp); if (result) goto unregister; if (ops->get_mode) { result = device_create_file(&tz->device, &dev_attr_mode); if (result) goto unregister; } for (count = 0; count < trips; count++) { TRIP_POINT_ATTR_ADD(&tz->device, count, result); if (result) goto unregister; tz->ops->get_trip_type(tz, count, &trip_type); if (trip_type == THERMAL_TRIP_PASSIVE) passive = 1; } if (!passive) result = device_create_file(&tz->device, &dev_attr_passive); if (result) goto unregister; result = thermal_add_hwmon_sysfs(tz); if (result) goto unregister; mutex_lock(&thermal_list_lock); list_add_tail(&tz->node, &thermal_tz_list); if (ops->bind) list_for_each_entry(pos, &thermal_cdev_list, node) { result = ops->bind(tz, pos); if (result) break; } mutex_unlock(&thermal_list_lock); INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check); thermal_zone_device_update(tz); if (!result) return tz; unregister: release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); device_unregister(&tz->device); return ERR_PTR(result); } EXPORT_SYMBOL(thermal_zone_device_register); /** * thermal_device_unregister - removes the registered thermal zone device * @tz: the thermal zone device to remove */ void thermal_zone_device_unregister(struct thermal_zone_device *tz) { struct thermal_cooling_device *cdev; struct thermal_zone_device *pos = NULL; int count; if (!tz) return; mutex_lock(&thermal_list_lock); list_for_each_entry(pos, &thermal_tz_list, node) if (pos == tz) break; if (pos != tz) { /* thermal zone device not found */ mutex_unlock(&thermal_list_lock); return; } list_del(&tz->node); if (tz->ops->unbind) list_for_each_entry(cdev, &thermal_cdev_list, node) tz->ops->unbind(tz, cdev); mutex_unlock(&thermal_list_lock); thermal_zone_device_set_polling(tz, 0); if (tz->type[0]) device_remove_file(&tz->device, &dev_attr_type); device_remove_file(&tz->device, &dev_attr_temp); if (tz->ops->get_mode) device_remove_file(&tz->device, &dev_attr_mode); for (count = 0; count < tz->trips; count++) TRIP_POINT_ATTR_REMOVE(&tz->device, count); thermal_remove_hwmon_sysfs(tz); release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); idr_destroy(&tz->idr); mutex_destroy(&tz->lock); device_unregister(&tz->device); return; } EXPORT_SYMBOL(thermal_zone_device_unregister); static int __init thermal_init(void) { int result = 0; result = class_register(&thermal_class); if (result) { idr_destroy(&thermal_tz_idr); idr_destroy(&thermal_cdev_idr); mutex_destroy(&thermal_idr_lock); mutex_destroy(&thermal_list_lock); } return result; } static void __exit thermal_exit(void) { class_unregister(&thermal_class); idr_destroy(&thermal_tz_idr); idr_destroy(&thermal_cdev_idr); mutex_destroy(&thermal_idr_lock); mutex_destroy(&thermal_list_lock); } subsys_initcall(thermal_init); module_exit(thermal_exit);