diff options
Diffstat (limited to 'drivers/thermal/thermal_core.c')
| -rw-r--r-- | drivers/thermal/thermal_core.c | 2011 |
1 files changed, 2011 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c new file mode 100644 index 000000000000..d755440791b7 --- /dev/null +++ b/drivers/thermal/thermal_core.c @@ -0,0 +1,2011 @@ +/* + * thermal.c - Generic Thermal Management Sysfs support. + * + * Copyright (C) 2008 Intel Corp + * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> + * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * 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. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/kdev_t.h> +#include <linux/idr.h> +#include <linux/thermal.h> +#include <linux/reboot.h> +#include <net/netlink.h> +#include <net/genetlink.h> + +#include "thermal_core.h" + +MODULE_AUTHOR("Zhang Rui"); +MODULE_DESCRIPTION("Generic thermal management sysfs support"); +MODULE_LICENSE("GPL v2"); + +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 LIST_HEAD(thermal_governor_list); + +static DEFINE_MUTEX(thermal_list_lock); +static DEFINE_MUTEX(thermal_governor_lock); + +static struct thermal_governor *__find_governor(const char *name) +{ + struct thermal_governor *pos; + + list_for_each_entry(pos, &thermal_governor_list, governor_list) + if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH)) + return pos; + + return NULL; +} + +int thermal_register_governor(struct thermal_governor *governor) +{ + int err; + const char *name; + struct thermal_zone_device *pos; + + if (!governor) + return -EINVAL; + + mutex_lock(&thermal_governor_lock); + + err = -EBUSY; + if (__find_governor(governor->name) == NULL) { + err = 0; + list_add(&governor->governor_list, &thermal_governor_list); + } + + mutex_lock(&thermal_list_lock); + + list_for_each_entry(pos, &thermal_tz_list, node) { + if (pos->governor) + continue; + if (pos->tzp) + name = pos->tzp->governor_name; + else + name = DEFAULT_THERMAL_GOVERNOR; + if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH)) + pos->governor = governor; + } + + mutex_unlock(&thermal_list_lock); + mutex_unlock(&thermal_governor_lock); + + return err; +} + +void thermal_unregister_governor(struct thermal_governor *governor) +{ + struct thermal_zone_device *pos; + + if (!governor) + return; + + mutex_lock(&thermal_governor_lock); + + if (__find_governor(governor->name) == NULL) + goto exit; + + mutex_lock(&thermal_list_lock); + + list_for_each_entry(pos, &thermal_tz_list, node) { + if (!strnicmp(pos->governor->name, governor->name, + THERMAL_NAME_LENGTH)) + pos->governor = NULL; + } + + mutex_unlock(&thermal_list_lock); + list_del(&governor->governor_list); +exit: + mutex_unlock(&thermal_governor_lock); + return; +} + +static int get_idr(struct idr *idr, struct mutex *lock, int *id) +{ + int ret; + + if (lock) + mutex_lock(lock); + ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL); + if (lock) + mutex_unlock(lock); + if (unlikely(ret < 0)) + return ret; + *id = ret; + 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); +} + +int get_tz_trend(struct thermal_zone_device *tz, int trip) +{ + enum thermal_trend trend; + + if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) { + if (tz->temperature > tz->last_temperature) + trend = THERMAL_TREND_RAISING; + else if (tz->temperature < tz->last_temperature) + trend = THERMAL_TREND_DROPPING; + else + trend = THERMAL_TREND_STABLE; + } + + return trend; +} +EXPORT_SYMBOL(get_tz_trend); + +struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz, + struct thermal_cooling_device *cdev, int trip) +{ + struct thermal_instance *pos = NULL; + struct thermal_instance *target_instance = NULL; + + mutex_lock(&tz->lock); + mutex_lock(&cdev->lock); + + list_for_each_entry(pos, &tz->thermal_instances, tz_node) { + if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { + target_instance = pos; + break; + } + } + + mutex_unlock(&cdev->lock); + mutex_unlock(&tz->lock); + + return target_instance; +} +EXPORT_SYMBOL(get_thermal_instance); + +static void print_bind_err_msg(struct thermal_zone_device *tz, + struct thermal_cooling_device *cdev, int ret) +{ + dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n", + tz->type, cdev->type, ret); +} + +static void __bind(struct thermal_zone_device *tz, int mask, + struct thermal_cooling_device *cdev) +{ + int i, ret; + + for (i = 0; i < tz->trips; i++) { + if (mask & (1 << i)) { + ret = thermal_zone_bind_cooling_device(tz, i, cdev, + THERMAL_NO_LIMIT, THERMAL_NO_LIMIT); + if (ret) + print_bind_err_msg(tz, cdev, ret); + } + } +} + +static void __unbind(struct thermal_zone_device *tz, int mask, + struct thermal_cooling_device *cdev) +{ + int i; + + for (i = 0; i < tz->trips; i++) + if (mask & (1 << i)) + thermal_zone_unbind_cooling_device(tz, i, cdev); +} + +static void bind_cdev(struct thermal_cooling_device *cdev) +{ + int i, ret; + const struct thermal_zone_params *tzp; + struct thermal_zone_device *pos = NULL; + + mutex_lock(&thermal_list_lock); + + list_for_each_entry(pos, &thermal_tz_list, node) { + if (!pos->tzp && !pos->ops->bind) + continue; + + if (!pos->tzp && pos->ops->bind) { + ret = pos->ops->bind(pos, cdev); + if (ret) + print_bind_err_msg(pos, cdev, ret); + } + + tzp = pos->tzp; + if (!tzp || !tzp->tbp) + continue; + + for (i = 0; i < tzp->num_tbps; i++) { + if (tzp->tbp[i].cdev || !tzp->tbp[i].match) + continue; + if (tzp->tbp[i].match(pos, cdev)) + continue; + tzp->tbp[i].cdev = cdev; + __bind(pos, tzp->tbp[i].trip_mask, cdev); + } + } + + mutex_unlock(&thermal_list_lock); +} + +static void bind_tz(struct thermal_zone_device *tz) +{ + int i, ret; + struct thermal_cooling_device *pos = NULL; + const struct thermal_zone_params *tzp = tz->tzp; + + if (!tzp && !tz->ops->bind) + return; + + mutex_lock(&thermal_list_lock); + + /* If there is no platform data, try to use ops->bind */ + if (!tzp && tz->ops->bind) { + list_for_each_entry(pos, &thermal_cdev_list, node) { + ret = tz->ops->bind(tz, pos); + if (ret) + print_bind_err_msg(tz, pos, ret); + } + goto exit; + } + + if (!tzp || !tzp->tbp) + goto exit; + + list_for_each_entry(pos, &thermal_cdev_list, node) { + for (i = 0; i < tzp->num_tbps; i++) { + if (tzp->tbp[i].cdev || !tzp->tbp[i].match) + continue; + if (tzp->tbp[i].match(tz, pos)) + continue; + tzp->tbp[i].cdev = pos; + __bind(tz, tzp->tbp[i].trip_mask, pos); + } + } +exit: + mutex_unlock(&thermal_list_lock); +} + +static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, + int delay) +{ + if (delay > 1000) + mod_delayed_work(system_freezable_wq, &tz->poll_queue, + round_jiffies(msecs_to_jiffies(delay))); + else if (delay) + mod_delayed_work(system_freezable_wq, &tz->poll_queue, + msecs_to_jiffies(delay)); + else + cancel_delayed_work(&tz->poll_queue); +} + +static void monitor_thermal_zone(struct thermal_zone_device *tz) +{ + mutex_lock(&tz->lock); + + 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); +} + +static void handle_non_critical_trips(struct thermal_zone_device *tz, + int trip, enum thermal_trip_type trip_type) +{ + if (tz->governor) + tz->governor->throttle(tz, trip); +} + +static void handle_critical_trips(struct thermal_zone_device *tz, + int trip, enum thermal_trip_type trip_type) +{ + long trip_temp; + + tz->ops->get_trip_temp(tz, trip, &trip_temp); + + /* If we have not crossed the trip_temp, we do not care. */ + if (tz->temperature < trip_temp) + return; + + if (tz->ops->notify) + tz->ops->notify(tz, trip, trip_type); + + if (trip_type == THERMAL_TRIP_CRITICAL) { + dev_emerg(&tz->device, + "critical temperature reached(%d C),shutting down\n", + tz->temperature / 1000); + orderly_poweroff(true); + } +} + +static void handle_thermal_trip(struct thermal_zone_device *tz, int trip) +{ + enum thermal_trip_type type; + + tz->ops->get_trip_type(tz, trip, &type); + + if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT) + handle_critical_trips(tz, trip, type); + else + handle_non_critical_trips(tz, trip, type); + /* + * Alright, we handled this trip successfully. + * So, start monitoring again. + */ + monitor_thermal_zone(tz); +} + +/** + * thermal_zone_get_temp() - returns its the temperature of thermal zone + * @tz: a valid pointer to a struct thermal_zone_device + * @temp: a valid pointer to where to store the resulting temperature. + * + * When a valid thermal zone reference is passed, it will fetch its + * temperature and fill @temp. + * + * Return: On success returns 0, an error code otherwise + */ +int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp) +{ + int ret = -EINVAL; +#ifdef CONFIG_THERMAL_EMULATION + int count; + unsigned long crit_temp = -1UL; + enum thermal_trip_type type; +#endif + + if (!tz || IS_ERR(tz)) + goto exit; + + mutex_lock(&tz->lock); + + ret = tz->ops->get_temp(tz, temp); +#ifdef CONFIG_THERMAL_EMULATION + if (!tz->emul_temperature) + goto skip_emul; + + for (count = 0; count < tz->trips; count++) { + ret = tz->ops->get_trip_type(tz, count, &type); + if (!ret && type == THERMAL_TRIP_CRITICAL) { + ret = tz->ops->get_trip_temp(tz, count, &crit_temp); + break; + } + } + + if (ret) + goto skip_emul; + + if (*temp < crit_temp) + *temp = tz->emul_temperature; +skip_emul: +#endif + mutex_unlock(&tz->lock); +exit: + return ret; +} +EXPORT_SYMBOL_GPL(thermal_zone_get_temp); + +static void update_temperature(struct thermal_zone_device *tz) +{ + long temp; + int ret; + + ret = thermal_zone_get_temp(tz, &temp); + if (ret) { + dev_warn(&tz->device, "failed to read out thermal zone %d\n", + tz->id); + return; + } + + mutex_lock(&tz->lock); + tz->last_temperature = tz->temperature; + tz->temperature = temp; + mutex_unlock(&tz->lock); +} + +void thermal_zone_device_update(struct thermal_zone_device *tz) +{ + int count; + + update_temperature(tz); + + for (count = 0; count < tz->trips; count++) + handle_thermal_trip(tz, count); +} +EXPORT_SYMBOL_GPL(thermal_zone_device_update); + +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); +} + +/* 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; + + ret = thermal_zone_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") - 1)) + result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED); + else if (!strncmp(buf, "disabled", sizeof("disabled") - 1)) + result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED); + else + result = -EINVAL; + + if (result) + return result; + + return count; +} + +static ssize_t +trip_point_type_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + enum thermal_trip_type type; + int trip, result; + + if (!tz->ops->get_trip_type) + return -EPERM; + + if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip)) + 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; + unsigned long temperature; + + if (!tz->ops->set_trip_temp) + return -EPERM; + + if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) + return -EINVAL; + + if (kstrtoul(buf, 10, &temperature)) + return -EINVAL; + + ret = tz->ops->set_trip_temp(tz, trip, temperature); + + return ret ? ret : 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; + 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 +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; + unsigned long temperature; + + if (!tz->ops->set_trip_hyst) + return -EPERM; + + if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip)) + return -EINVAL; + + if (kstrtoul(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); + + 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; + unsigned long temperature; + + if (!tz->ops->get_trip_hyst) + return -EPERM; + + if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip)) + return -EINVAL; + + ret = tz->ops->get_trip_hyst(tz, trip, &temperature); + + return ret ? ret : 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, + THERMAL_NO_LIMIT, + THERMAL_NO_LIMIT); + } + 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->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 ssize_t +policy_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret = -EINVAL; + struct thermal_zone_device *tz = to_thermal_zone(dev); + struct thermal_governor *gov; + + mutex_lock(&thermal_governor_lock); + + gov = __find_governor(buf); + if (!gov) + goto exit; + + tz->governor = gov; + ret = count; + +exit: + mutex_unlock(&thermal_governor_lock); + 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); +} + +#ifdef 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; + unsigned long temperature; + + if (kstrtoul(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); + } + + return ret ? ret : count; +} +static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store); +#endif/*CONFIG_THERMAL_EMULATION*/ + +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 DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store); + +/* 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_instance *instance; + + instance = + container_of(attr, struct thermal_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 <linux/hwmon.h> + +/* thermal zone devices with the same type share one hwmon device */ +struct thermal_hwmon_device { + char type[THERMAL_NAME_LENGTH]; + struct device *device; + int count; + struct list_head tz_list; + struct list_head node; +}; + +struct thermal_hwmon_attr { + struct device_attribute attr; + char name[16]; +}; + +/* one temperature input for each thermal zone */ +struct thermal_hwmon_temp { + struct list_head hwmon_node; + struct thermal_zone_device *tz; + struct thermal_hwmon_attr temp_input; /* hwmon sys attr */ + struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */ +}; + +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_hwmon_temp *temp + = container_of(hwmon_attr, struct thermal_hwmon_temp, + temp_input); + struct thermal_zone_device *tz = temp->tz; + + ret = thermal_zone_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_hwmon_temp *temp + = container_of(hwmon_attr, struct thermal_hwmon_temp, + temp_crit); + struct thermal_zone_device *tz = temp->tz; + long temperature; + int ret; + + ret = tz->ops->get_trip_temp(tz, 0, &temperature); + if (ret) + return ret; + + return sprintf(buf, "%ld\n", temperature); +} + + +static struct thermal_hwmon_device * +thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz) +{ + struct thermal_hwmon_device *hwmon; + + mutex_lock(&thermal_list_lock); + list_for_each_entry(hwmon, &thermal_hwmon_list, node) + if (!strcmp(hwmon->type, tz->type)) { + mutex_unlock(&thermal_list_lock); + return hwmon; + } + mutex_unlock(&thermal_list_lock); + + return NULL; +} + +/* Find the temperature input matching a given thermal zone */ +static struct thermal_hwmon_temp * +thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon, + const struct thermal_zone_device *tz) +{ + struct thermal_hwmon_temp *temp; + + mutex_lock(&thermal_list_lock); + list_for_each_entry(temp, &hwmon->tz_list, hwmon_node) + if (temp->tz == tz) { + mutex_unlock(&thermal_list_lock); + return temp; + } + mutex_unlock(&thermal_list_lock); + + return NULL; +} + +static int +thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) +{ + struct thermal_hwmon_device *hwmon; + struct thermal_hwmon_temp *temp; + int new_hwmon_device = 1; + int result; + + hwmon = thermal_hwmon_lookup_by_type(tz); + if (hwmon) { + new_hwmon_device = 0; + goto register_sys_interface; + } + + 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 free_mem; + + register_sys_interface: + temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL); + if (!temp) { + result = -ENOMEM; + goto unregister_name; + } + + temp->tz = tz; + hwmon->count++; + + snprintf(temp->temp_input.name, sizeof(temp->temp_input.name), + "temp%d_input", hwmon->count); + temp->temp_input.attr.attr.name = temp->temp_input.name; + temp->temp_input.attr.attr.mode = 0444; + temp->temp_input.attr.show = temp_input_show; + sysfs_attr_init(&temp->temp_input.attr.attr); + result = device_create_file(hwmon->device, &temp->temp_input.attr); + if (result) + goto free_temp_mem; + + if (tz->ops->get_crit_temp) { + unsigned long temperature; + if (!tz->ops->get_crit_temp(tz, &temperature)) { + snprintf(temp->temp_crit.name, + sizeof(temp->temp_crit.name), + "temp%d_crit", hwmon->count); + temp->temp_crit.attr.attr.name = temp->temp_crit.name; + temp->temp_crit.attr.attr.mode = 0444; + temp->temp_crit.attr.show = temp_crit_show; + sysfs_attr_init(&temp->temp_crit.attr.attr); + result = device_create_file(hwmon->device, + &temp->temp_crit.attr); + if (result) + goto unregister_input; + } + } + + mutex_lock(&thermal_list_lock); + if (new_hwmon_device) + list_add_tail(&hwmon->node, &thermal_hwmon_list); + list_add_tail(&temp->hwmon_node, &hwmon->tz_list); + mutex_unlock(&thermal_list_lock); + + return 0; + + unregister_input: + device_remove_file(hwmon->device, &temp->temp_input.attr); + free_temp_mem: + kfree(temp); + unregister_name: + 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; + struct thermal_hwmon_temp *temp; + + hwmon = thermal_hwmon_lookup_by_type(tz); + if (unlikely(!hwmon)) { + /* Should never happen... */ + dev_dbg(&tz->device, "hwmon device lookup failed!\n"); + return; + } + + temp = thermal_hwmon_lookup_temp(hwmon, tz); + if (unlikely(!temp)) { + /* Should never happen... */ + dev_dbg(&tz->device, "temperature input lookup failed!\n"); + return; + } + + device_remove_file(hwmon->device, &temp->temp_input.attr); + if (tz->ops->get_crit_temp) + device_remove_file(hwmon->device, &temp->temp_crit.attr); + + mutex_lock(&thermal_list_lock); + list_del(&temp->hwmon_node); + kfree(temp); + 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 + +/** + * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone + * @tz: pointer to struct thermal_zone_device + * @trip: indicates which trip point the cooling devices is + * associated with in this thermal zone. + * @cdev: pointer to struct thermal_cooling_device + * @upper: the Maximum cooling state for this trip point. + * THERMAL_NO_LIMIT means no upper limit, + * and the cooling device can be in max_state. + * @lower: the Minimum cooling state can be used for this trip point. + * THERMAL_NO_LIMIT means no lower limit, + * and the cooling device can be in cooling state 0. + * + * This interface function bind a thermal cooling device to the certain trip + * point of a thermal zone device. + * This function is usually called in the thermal zone device .bind callback. + * + * Return: 0 on success, the proper error value otherwise. + */ +int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, + int trip, + struct thermal_cooling_device *cdev, + unsigned long upper, unsigned long lower) +{ + struct thermal_instance *dev; + struct thermal_instance *pos; + struct thermal_zone_device *pos1; + struct thermal_cooling_device *pos2; + unsigned long max_state; + 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; + + cdev->ops->get_max_state(cdev, &max_state); + + /* lower default 0, upper default max_state */ + lower = lower == THERMAL_NO_LIMIT ? 0 : lower; + upper = upper == THERMAL_NO_LIMIT ? max_state : upper; + + if (lower > upper || upper > max_state) + return -EINVAL; + + dev = + kzalloc(sizeof(struct thermal_instance), GFP_KERNEL); + if (!dev) + return -ENOMEM; + dev->tz = tz; + dev->cdev = cdev; + dev->trip = trip; + dev->upper = upper; + dev->lower = lower; + dev->target = THERMAL_NO_TARGET; + + 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); + mutex_lock(&cdev->lock); + list_for_each_entry(pos, &tz->thermal_instances, tz_node) + if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { + result = -EEXIST; + break; + } + if (!result) { + list_add_tail(&dev->tz_node, &tz->thermal_instances); + list_add_tail(&dev->cdev_node, &cdev->thermal_instances); + } + mutex_unlock(&cdev->lock); + 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_GPL(thermal_zone_bind_cooling_device); + +/** + * thermal_zone_unbind_cooling_device() - unbind a cooling device from a + * thermal zone. + * @tz: pointer to a struct thermal_zone_device. + * @trip: indicates which trip point the cooling devices is + * associated with in this thermal zone. + * @cdev: pointer to a struct thermal_cooling_device. + * + * This interface function unbind a thermal cooling device from the certain + * trip point of a thermal zone device. + * This function is usually called in the thermal zone device .unbind callback. + * + * Return: 0 on success, the proper error value otherwise. + */ +int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, + int trip, + struct thermal_cooling_device *cdev) +{ + struct thermal_instance *pos, *next; + + mutex_lock(&tz->lock); + mutex_lock(&cdev->lock); + list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { + if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { + list_del(&pos->tz_node); + list_del(&pos->cdev_node); + mutex_unlock(&cdev->lock); + mutex_unlock(&tz->lock); + goto unbind; + } + } + mutex_unlock(&cdev->lock); + 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_GPL(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. + * + * This interface function adds a new thermal cooling device (fan/processor/...) + * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself + * to all the thermal zone devices registered at the same time. + * + * Return: a pointer to the created struct thermal_cooling_device or an + * ERR_PTR. Caller must check return value with IS_ERR*() helpers. + */ +struct thermal_cooling_device * +thermal_cooling_device_register(char *type, void *devdata, + const struct thermal_cooling_device_ops *ops) +{ + struct thermal_cooling_device *cdev; + int result; + + if (type && 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); + } + + strlcpy(cdev->type, type ? : "", sizeof(cdev->type)); + mutex_init(&cdev->lock); + INIT_LIST_HEAD(&cdev->thermal_instances); + cdev->ops = ops; + cdev->updated = true; + 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; + + /* Add 'this' new cdev to the global cdev list */ + mutex_lock(&thermal_list_lock); + list_add(&cdev->node, &thermal_cdev_list); + mutex_unlock(&thermal_list_lock); + + /* Update binding information for 'this' new cdev */ + bind_cdev(cdev); + + return cdev; + +unregister: + release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); + device_unregister(&cdev->device); + return ERR_PTR(result); +} +EXPORT_SYMBOL_GPL(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) +{ + int i; + const struct thermal_zone_params *tzp; + 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); + + /* Unbind all thermal zones associated with 'this' cdev */ + list_for_each_entry(tz, &thermal_tz_list, node) { + if (tz->ops->unbind) { + tz->ops->unbind(tz, cdev); + continue; + } + + if (!tz->tzp || !tz->tzp->tbp) + continue; + + tzp = tz->tzp; + for (i = 0; i < tzp->num_tbps; i++) { + if (tzp->tbp[i].cdev == cdev) { + __unbind(tz, tzp->tbp[i].trip_mask, cdev); + tzp->tbp[i].cdev = NULL; + } + } + } + + 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_GPL(thermal_cooling_device_unregister); + +void thermal_cdev_update(struct thermal_cooling_device *cdev) +{ + struct thermal_instance *instance; + unsigned long target = 0; + + /* cooling device is updated*/ + if (cdev->updated) + return; + + mutex_lock(&cdev->lock); + /* Make sure cdev enters the deepest cooling state */ + list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) { + if (instance->target == THERMAL_NO_TARGET) + continue; + if (instance->target > target) + target = instance->target; + } + mutex_unlock(&cdev->lock); + cdev->ops->set_cur_state(cdev, target); + cdev->updated = true; +} +EXPORT_SYMBOL(thermal_cdev_update); + +/** + * thermal_notify_framework - Sensor drivers use this API to notify framework + * @tz: thermal zone device + * @trip: indicates which trip point has been crossed + * + * This function handles the trip events from sensor drivers. It starts + * throttling the cooling devices according to the policy configured. + * For CRITICAL and HOT trip points, this notifies the respective drivers, + * and does actual throttling for other trip points i.e ACTIVE and PASSIVE. + * The throttling policy is based on the configured platform data; if no + * platform data is provided, this uses the step_wise throttling policy. + */ +void thermal_notify_framework(struct thermal_zone_device *tz, int trip) +{ + handle_thermal_trip(tz, trip); +} +EXPORT_SYMBOL_GPL(thermal_notify_framework); + +/** + * create_trip_attrs() - create attributes for trip points + * @tz: the thermal zone device + * @mask: Writeable trip point bitmap. + * + * helper function to instantiate sysfs entries for every trip + * point and its properties of a struct thermal_zone_device. + * + * Return: 0 on success, the proper error value otherwise. + */ +static int create_trip_attrs(struct thermal_zone_device *tz, int mask) +{ + int indx; + int size = sizeof(struct thermal_attr) * tz->trips; + + tz->trip_type_attrs = kzalloc(size, GFP_KERNEL); + if (!tz->trip_type_attrs) + return -ENOMEM; + + tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL); + if (!tz->trip_temp_attrs) { + kfree(tz->trip_type_attrs); + return -ENOMEM; + } + + if (tz->ops->get_trip_hyst) { + tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL); + if (!tz->trip_hyst_attrs) { + kfree(tz->trip_type_attrs); + kfree(tz->trip_temp_attrs); + return -ENOMEM; + } + } + + + for (indx = 0; indx < tz->trips; indx++) { + /* create trip type attribute */ + snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH, + "trip_point_%d_type", indx); + + sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr); + tz->trip_type_attrs[indx].attr.attr.name = + tz->trip_type_attrs[indx].name; + tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO; + tz->trip_type_attrs[indx].attr.show = trip_point_type_show; + + device_create_file(&tz->device, + &tz->trip_type_attrs[indx].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 (mask & (1 << indx)) { + tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR; + tz->trip_temp_attrs[indx].attr.store = + trip_point_temp_store; + } + + device_create_file(&tz->device, + &tz->trip_temp_attrs[indx].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; + } + + device_create_file(&tz->device, + &tz->trip_hyst_attrs[indx].attr); + } + return 0; +} + +static void remove_trip_attrs(struct thermal_zone_device *tz) +{ + int indx; + + for (indx = 0; indx < tz->trips; indx++) { + device_remove_file(&tz->device, + &tz->trip_type_attrs[indx].attr); + device_remove_file(&tz->device, + &tz->trip_temp_attrs[indx].attr); + if (tz->ops->get_trip_hyst) + device_remove_file(&tz->device, + &tz->trip_hyst_attrs[indx].attr); + } + kfree(tz->trip_type_attrs); + kfree(tz->trip_temp_attrs); + kfree(tz->trip_hyst_attrs); +} + +/** + * 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 + * @mask: a bit string indicating the writeablility of trip points + * @devdata: private device data + * @ops: standard thermal zone device callbacks + * @tzp: thermal zone platform parameters + * @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) + * + * This interface function adds a new thermal zone device (sensor) to + * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the + * thermal cooling devices registered at the same time. + * thermal_zone_device_unregister() must be called when the device is no + * longer needed. The passive cooling depends on the .get_trend() return value. + * + * Return: a pointer to the created struct thermal_zone_device or an + * in case of error, an ERR_PTR. Caller must check return value with + * IS_ERR*() helpers. + */ +struct thermal_zone_device *thermal_zone_device_register(const char *type, + int trips, int mask, void *devdata, + const struct thermal_zone_device_ops *ops, + const struct thermal_zone_params *tzp, + int passive_delay, int polling_delay) +{ + struct thermal_zone_device *tz; + enum thermal_trip_type trip_type; + int result; + int count; + int passive = 0; + + if (type && strlen(type) >= THERMAL_NAME_LENGTH) + return ERR_PTR(-EINVAL); + + if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) + return ERR_PTR(-EINVAL); + + if (!ops || !ops->get_temp) + return ERR_PTR(-EINVAL); + + if (trips > 0 && !ops->get_trip_type) + return ERR_PTR(-EINVAL); + + tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL); + if (!tz) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&tz->thermal_instances); + 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); + } + + strlcpy(tz->type, type ? : "", sizeof(tz->type)); + tz->ops = ops; + tz->tzp = tzp; + tz->device.class = &thermal_class; + tz->devdata = devdata; + tz->trips = trips; + 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; + } + + result = create_trip_attrs(tz, mask); + if (result) + goto unregister; + + for (count = 0; count < trips; count++) { + 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; + } + +#ifdef CONFIG_THERMAL_EMULATION + result = device_create_file(&tz->device, &dev_attr_emul_temp); + if (result) + goto unregister; +#endif + /* Create policy attribute */ + result = device_create_file(&tz->device, &dev_attr_policy); + if (result) + goto unregister; + + /* Update 'this' zone's governor information */ + mutex_lock(&thermal_governor_lock); + + if (tz->tzp) + tz->governor = __find_governor(tz->tzp->governor_name); + else + tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR); + + mutex_unlock(&thermal_governor_lock); + + result = thermal_add_hwmon_sysfs(tz); + if (result) + goto unregister; + + mutex_lock(&thermal_list_lock); + list_add_tail(&tz->node, &thermal_tz_list); + mutex_unlock(&thermal_list_lock); + + /* Bind cooling devices for this zone */ + bind_tz(tz); + + 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_GPL(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) +{ + int i; + const struct thermal_zone_params *tzp; + struct thermal_cooling_device *cdev; + struct thermal_zone_device *pos = NULL; + + if (!tz) + return; + + tzp = tz->tzp; + + 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); + + /* Unbind all cdevs associated with 'this' thermal zone */ + list_for_each_entry(cdev, &thermal_cdev_list, node) { + if (tz->ops->unbind) { + tz->ops->unbind(tz, cdev); + continue; + } + + if (!tzp || !tzp->tbp) + break; + + for (i = 0; i < tzp->num_tbps; i++) { + if (tzp->tbp[i].cdev == cdev) { + __unbind(tz, tzp->tbp[i].trip_mask, cdev); + tzp->tbp[i].cdev = NULL; + } + } + } + + 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); + device_remove_file(&tz->device, &dev_attr_policy); + remove_trip_attrs(tz); + tz->governor = NULL; + + 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_GPL(thermal_zone_device_unregister); + +/** + * thermal_zone_get_zone_by_name() - search for a zone and returns its ref + * @name: thermal zone name to fetch the temperature + * + * When only one zone is found with the passed name, returns a reference to it. + * + * Return: On success returns a reference to an unique thermal zone with + * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid + * paramenters, -ENODEV for not found and -EEXIST for multiple matches). + */ +struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name) +{ + struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL); + unsigned int found = 0; + + if (!name) + goto exit; + + mutex_lock(&thermal_list_lock); + list_for_each_entry(pos, &thermal_tz_list, node) + if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) { + found++; + ref = pos; + } + mutex_unlock(&thermal_list_lock); + + /* nothing has been found, thus an error code for it */ + if (found == 0) + ref = ERR_PTR(-ENODEV); + else if (found > 1) + /* Success only when an unique zone is found */ + ref = ERR_PTR(-EEXIST); + +exit: + return ref; +} +EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name); + +#ifdef CONFIG_NET +static struct genl_family thermal_event_genl_family = { + .id = GENL_ID_GENERATE, + .name = THERMAL_GENL_FAMILY_NAME, + .version = THERMAL_GENL_VERSION, + .maxattr = THERMAL_GENL_ATTR_MAX, +}; + +static struct genl_multicast_group thermal_event_mcgrp = { + .name = THERMAL_GENL_MCAST_GROUP_NAME, +}; + +int thermal_generate_netlink_event(struct thermal_zone_device *tz, + enum events event) +{ + struct sk_buff *skb; + struct nlattr *attr; + struct thermal_genl_event *thermal_event; + void *msg_header; + int size; + int result; + static unsigned int thermal_event_seqnum; + + if (!tz) + return -EINVAL; + + /* allocate memory */ + size = nla_total_size(sizeof(struct thermal_genl_event)) + + nla_total_size(0); + + skb = genlmsg_new(size, GFP_ATOMIC); + if (!skb) + return -ENOMEM; + + /* add the genetlink message header */ + msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++, + &thermal_event_genl_family, 0, + THERMAL_GENL_CMD_EVENT); + if (!msg_header) { + nlmsg_free(skb); + return -ENOMEM; + } + + /* fill the data */ + attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, + sizeof(struct thermal_genl_event)); + + if (!attr) { + nlmsg_free(skb); + return -EINVAL; + } + + thermal_event = nla_data(attr); + if (!thermal_event) { + nlmsg_free(skb); + return -EINVAL; + } + + memset(thermal_event, 0, sizeof(struct thermal_genl_event)); + + thermal_event->orig = tz->id; + thermal_event->event = event; + + /* send multicast genetlink message */ + result = genlmsg_end(skb, msg_header); + if (result < 0) { + nlmsg_free(skb); + return result; + } + + result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC); + if (result) + dev_err(&tz->device, "Failed to send netlink event:%d", result); + + return result; +} +EXPORT_SYMBOL_GPL(thermal_generate_netlink_event); + +static int genetlink_init(void) +{ + int result; + + result = genl_register_family(&thermal_event_genl_family); + if (result) + return result; + + result = genl_register_mc_group(&thermal_event_genl_family, + &thermal_event_mcgrp); + if (result) + genl_unregister_family(&thermal_event_genl_family); + return result; +} + +static void genetlink_exit(void) +{ + genl_unregister_family(&thermal_event_genl_family); +} +#else /* !CONFIG_NET */ +static inline int genetlink_init(void) { return 0; } +static inline void genetlink_exit(void) {} +#endif /* !CONFIG_NET */ + +static int __init thermal_register_governors(void) +{ + int result; + + result = thermal_gov_step_wise_register(); + if (result) + return result; + + result = thermal_gov_fair_share_register(); + if (result) + return result; + + return thermal_gov_user_space_register(); +} + +static void thermal_unregister_governors(void) +{ + thermal_gov_step_wise_unregister(); + thermal_gov_fair_share_unregister(); + thermal_gov_user_space_unregister(); +} + +static int __init thermal_init(void) +{ + int result; + + result = thermal_register_governors(); + if (result) + goto error; + + result = class_register(&thermal_class); + if (result) + goto unregister_governors; + + result = genetlink_init(); + if (result) + goto unregister_class; + + return 0; + +unregister_governors: + thermal_unregister_governors(); +unregister_class: + class_unregister(&thermal_class); +error: + idr_destroy(&thermal_tz_idr); + idr_destroy(&thermal_cdev_idr); + mutex_destroy(&thermal_idr_lock); + mutex_destroy(&thermal_list_lock); + mutex_destroy(&thermal_governor_lock); + return result; +} + +static void __exit thermal_exit(void) +{ + genetlink_exit(); + class_unregister(&thermal_class); + thermal_unregister_governors(); + idr_destroy(&thermal_tz_idr); + idr_destroy(&thermal_cdev_idr); + mutex_destroy(&thermal_idr_lock); + mutex_destroy(&thermal_list_lock); + mutex_destroy(&thermal_governor_lock); +} + +fs_initcall(thermal_init); +module_exit(thermal_exit); |