diff options
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/Kconfig | 28 | ||||
| -rw-r--r-- | drivers/thermal/Makefile | 6 | ||||
| -rw-r--r-- | drivers/thermal/spear_thermal.c | 206 | ||||
| -rw-r--r-- | drivers/thermal/thermal_sys.c | 1402 |
4 files changed, 1642 insertions, 0 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig new file mode 100644 index 00000000..514a691a --- /dev/null +++ b/drivers/thermal/Kconfig @@ -0,0 +1,28 @@ +# +# Generic thermal sysfs drivers configuration +# + +menuconfig THERMAL + tristate "Generic Thermal sysfs driver" + help + Generic Thermal Sysfs driver offers a generic mechanism for + thermal management. Usually it's made up of one or more thermal + zone and cooling device. + Each thermal zone contains its own temperature, trip points, + cooling devices. + All platforms with ACPI thermal support can use this driver. + If you want this support, you should say Y or M here. + +config THERMAL_HWMON + bool + depends on THERMAL + depends on HWMON=y || HWMON=THERMAL + default y + +config SPEAR_THERMAL + bool "SPEAr thermal sensor driver" + depends on THERMAL + depends on PLAT_SPEAR + help + Enable this to plug the SPEAr thermal sensor driver into the Linux + thermal framework diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile new file mode 100644 index 00000000..a9fff0bf --- /dev/null +++ b/drivers/thermal/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for sensor chip drivers. +# + +obj-$(CONFIG_THERMAL) += thermal_sys.o +obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
\ No newline at end of file diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c new file mode 100644 index 00000000..c2e32df3 --- /dev/null +++ b/drivers/thermal/spear_thermal.c @@ -0,0 +1,206 @@ +/* + * SPEAr thermal driver. + * + * Copyright (C) 2011-2012 ST Microelectronics + * Author: Vincenzo Frascino <vincenzo.frascino@st.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/platform_data/spear_thermal.h> +#include <linux/thermal.h> + +#define MD_FACTOR 1000 + +/* SPEAr Thermal Sensor Dev Structure */ +struct spear_thermal_dev { + /* pointer to base address of the thermal sensor */ + void __iomem *thermal_base; + /* clk structure */ + struct clk *clk; + /* pointer to thermal flags */ + unsigned int flags; +}; + +static inline int thermal_get_temp(struct thermal_zone_device *thermal, + unsigned long *temp) +{ + struct spear_thermal_dev *stdev = thermal->devdata; + + /* + * Data are ready to be read after 628 usec from POWERDOWN signal + * (PDN) = 1 + */ + *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR; + return 0; +} + +static struct thermal_zone_device_ops ops = { + .get_temp = thermal_get_temp, +}; + +#ifdef CONFIG_PM +static int spear_thermal_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); + struct spear_thermal_dev *stdev = spear_thermal->devdata; + unsigned int actual_mask = 0; + + /* Disable SPEAr Thermal Sensor */ + actual_mask = readl_relaxed(stdev->thermal_base); + writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); + + clk_disable(stdev->clk); + dev_info(dev, "Suspended.\n"); + + return 0; +} + +static int spear_thermal_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); + struct spear_thermal_dev *stdev = spear_thermal->devdata; + unsigned int actual_mask = 0; + int ret = 0; + + ret = clk_enable(stdev->clk); + if (ret) { + dev_err(&pdev->dev, "Can't enable clock\n"); + return ret; + } + + /* Enable SPEAr Thermal Sensor */ + actual_mask = readl_relaxed(stdev->thermal_base); + writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base); + + dev_info(dev, "Resumed.\n"); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend, + spear_thermal_resume); + +static int spear_thermal_probe(struct platform_device *pdev) +{ + struct thermal_zone_device *spear_thermal = NULL; + struct spear_thermal_dev *stdev; + struct spear_thermal_pdata *pdata; + int ret = 0; + struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!stres) { + dev_err(&pdev->dev, "memory resource missing\n"); + return -ENODEV; + } + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_err(&pdev->dev, "platform data is NULL\n"); + return -EINVAL; + } + + stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL); + if (!stdev) { + dev_err(&pdev->dev, "kzalloc fail\n"); + return -ENOMEM; + } + + /* Enable thermal sensor */ + stdev->thermal_base = devm_ioremap(&pdev->dev, stres->start, + resource_size(stres)); + if (!stdev->thermal_base) { + dev_err(&pdev->dev, "ioremap failed\n"); + return -ENOMEM; + } + + stdev->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(stdev->clk)) { + dev_err(&pdev->dev, "Can't get clock\n"); + return PTR_ERR(stdev->clk); + } + + ret = clk_enable(stdev->clk); + if (ret) { + dev_err(&pdev->dev, "Can't enable clock\n"); + goto put_clk; + } + + stdev->flags = pdata->thermal_flags; + writel_relaxed(stdev->flags, stdev->thermal_base); + + spear_thermal = thermal_zone_device_register("spear_thermal", 0, + stdev, &ops, 0, 0, 0, 0); + if (IS_ERR(spear_thermal)) { + dev_err(&pdev->dev, "thermal zone device is NULL\n"); + ret = PTR_ERR(spear_thermal); + goto disable_clk; + } + + platform_set_drvdata(pdev, spear_thermal); + + dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n", + stdev->thermal_base); + + return 0; + +disable_clk: + clk_disable(stdev->clk); +put_clk: + clk_put(stdev->clk); + + return ret; +} + +static int spear_thermal_exit(struct platform_device *pdev) +{ + unsigned int actual_mask = 0; + struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); + struct spear_thermal_dev *stdev = spear_thermal->devdata; + + thermal_zone_device_unregister(spear_thermal); + platform_set_drvdata(pdev, NULL); + + /* Disable SPEAr Thermal Sensor */ + actual_mask = readl_relaxed(stdev->thermal_base); + writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); + + clk_disable(stdev->clk); + clk_put(stdev->clk); + + return 0; +} + +static struct platform_driver spear_thermal_driver = { + .probe = spear_thermal_probe, + .remove = spear_thermal_exit, + .driver = { + .name = "spear_thermal", + .owner = THIS_MODULE, + .pm = &spear_thermal_pm_ops, + }, +}; + +module_platform_driver(spear_thermal_driver); + +MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>"); +MODULE_DESCRIPTION("SPEAr thermal driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c new file mode 100644 index 00000000..022bacb7 --- /dev/null +++ b/drivers/thermal/thermal_sys.c @@ -0,0 +1,1402 @@ +/* + * 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/spinlock.h> +#include <linux/reboot.h> +#include <net/netlink.h> +#include <net/genetlink.h> + +MODULE_AUTHOR("Zhang Rui"); +MODULE_DESCRIPTION("Generic thermal management sysfs support"); +MODULE_LICENSE("GPL"); + +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") - 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_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), +}; + +/* 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 <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 = 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_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, THERMAL_NAME_LENGTH, + "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, THERMAL_NAME_LENGTH, + "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 + +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) + queue_delayed_work(system_freezable_wq, &(tz->poll_queue), + round_jiffies(msecs_to_jiffies(delay))); + else + queue_delayed_work(system_freezable_wq, &(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 */ + pr_warn("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) { + pr_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++) { + result = device_create_file(&tz->device, + &trip_point_attrs[count * 2]); + if (result) + break; + result = device_create_file(&tz->device, + &trip_point_attrs[count * 2 + 1]); + 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++) { + device_remove_file(&tz->device, + &trip_point_attrs[count * 2]); + device_remove_file(&tz->device, + &trip_point_attrs[count * 2 + 1]); + } + 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); + +#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(u32 orig, 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; + + /* 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 = orig; + 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) + pr_info("failed to send netlink event:%d\n", result); + + return result; +} +EXPORT_SYMBOL(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_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); + } + result = genetlink_init(); + 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); + genetlink_exit(); +} + +fs_initcall(thermal_init); +module_exit(thermal_exit); |