diff options
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/thermal/Makefile | 3 | ||||
| -rw-r--r-- | drivers/thermal/thermal_core.c | 255 | ||||
| -rw-r--r-- | drivers/thermal/thermal_hwmon.c | 269 | ||||
| -rw-r--r-- | drivers/thermal/thermal_hwmon.h | 49 |
5 files changed, 331 insertions, 254 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index ae18f025a761..dbfc390330ac 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -17,8 +17,17 @@ if THERMAL config THERMAL_HWMON bool + prompt "Expose thermal sensors as hwmon device" depends on HWMON=y || HWMON=THERMAL default y + help + In case a sensor is registered with the thermal + framework, this option will also register it + as a hwmon. The sensor will then have the common + hwmon sysfs interface. + + Say 'Y' here if you want all thermal sensors to + have hwmon sysfs interface too. choice prompt "Default Thermal governor" diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index c19df7ab2614..584b36319d51 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -5,6 +5,9 @@ obj-$(CONFIG_THERMAL) += thermal_sys.o thermal_sys-y += thermal_core.o +# interface to/from other layers providing sensors +thermal_sys-$(CONFIG_THERMAL_HWMON) += thermal_hwmon.o + # governors thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += fair_share.o thermal_sys-$(CONFIG_THERMAL_GOV_STEP_WISE) += step_wise.o diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 1f02e8edb45c..247528bbf00c 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -38,6 +38,7 @@ #include <net/genetlink.h> #include "thermal_core.h" +#include "thermal_hwmon.h" MODULE_AUTHOR("Zhang Rui"); MODULE_DESCRIPTION("Generic thermal management sysfs support"); @@ -859,260 +860,6 @@ thermal_cooling_device_trip_point_show(struct device *dev, /* 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 diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c new file mode 100644 index 000000000000..fdb07199d9c2 --- /dev/null +++ b/drivers/thermal/thermal_hwmon.c @@ -0,0 +1,269 @@ +/* + * thermal_hwmon.c - Generic Thermal Management hwmon support. + * + * Code based on Intel thermal_core.c. Copyrights of the original code: + * Copyright (C) 2008 Intel Corp + * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> + * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> + * + * Copyright (C) 2013 Texas Instruments + * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.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. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ +#include <linux/hwmon.h> +#include <linux/thermal.h> +#include <linux/slab.h> +#include <linux/err.h> +#include "thermal_hwmon.h" + +/* hwmon sys I/F */ +/* 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 DEFINE_MUTEX(thermal_hwmon_list_lock); + +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_hwmon_list_lock); + list_for_each_entry(hwmon, &thermal_hwmon_list, node) + if (!strcmp(hwmon->type, tz->type)) { + mutex_unlock(&thermal_hwmon_list_lock); + return hwmon; + } + mutex_unlock(&thermal_hwmon_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_hwmon_list_lock); + list_for_each_entry(temp, &hwmon->tz_list, hwmon_node) + if (temp->tz == tz) { + mutex_unlock(&thermal_hwmon_list_lock); + return temp; + } + mutex_unlock(&thermal_hwmon_list_lock); + + return NULL; +} + +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(*hwmon), 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(*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_hwmon_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_hwmon_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; +} + +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_hwmon_list_lock); + list_del(&temp->hwmon_node); + kfree(temp); + if (!list_empty(&hwmon->tz_list)) { + mutex_unlock(&thermal_hwmon_list_lock); + return; + } + list_del(&hwmon->node); + mutex_unlock(&thermal_hwmon_list_lock); + + device_remove_file(hwmon->device, &dev_attr_name); + hwmon_device_unregister(hwmon->device); + kfree(hwmon); +} diff --git a/drivers/thermal/thermal_hwmon.h b/drivers/thermal/thermal_hwmon.h new file mode 100644 index 000000000000..c798fdb2ae43 --- /dev/null +++ b/drivers/thermal/thermal_hwmon.h @@ -0,0 +1,49 @@ +/* + * thermal_hwmon.h - Generic Thermal Management hwmon support. + * + * Code based on Intel thermal_core.c. Copyrights of the original code: + * Copyright (C) 2008 Intel Corp + * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> + * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> + * + * Copyright (C) 2013 Texas Instruments + * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.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. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ +#ifndef __THERMAL_HWMON_H__ +#define __THERMAL_HWMON_H__ + +#include <linux/thermal.h> + +#ifdef CONFIG_THERMAL_HWMON +int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz); +void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz); +#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 + +#endif /* __THERMAL_HWMON_H__ */ |