+++ /dev/null
-/*
- * linux/drivers/thermal/devfreq_cooling.c
- *
- * Copyright (C) 2015 Samsung Electronics Co., Ltd
- * Author: Chanwoo Choi <cw00.choi@samsung.com>
- *
- * This driver is based on drivers/thermal/cpu_cooling.c.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * 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/module.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/thermal.h>
-#include <linux/devfreq.h>
-#include <linux/devfreq_cooling.h>
-
-/*
- * Cooling state <-> devfreq frequency
- *
- * Cooling states are translated to frequencies throughout this driver and this
- * is the relation between them.
- *
- * Highest cooling state corresponds to lowest possible frequency.
- *
- * i.e.
- * level 0 --> 1st Max Freq
- * level 1 --> 2nd Max Freq
- * ...
- */
-
-/**
- * struct devfreq_cooling_device - data for cooling device with devfreq
- * @cool_dev: thermal_cooling_device pointer to keep track of the
- * registered cooling device.
- * @devfreq: the devfreq instance.
- * @cur_state: integer value representing the current state of devfreq
- * cooling devices.
- * @max_state: interger value representing the maximum state of devfreq
- * cooling devices.
- *
- * This structure is required for keeping information of each registered
- * devfreq_cooling_device.
- */
-struct devfreq_cooling_device {
- struct thermal_cooling_device *cool_dev;
- struct devfreq *devfreq;
-
- unsigned int cur_state;
- unsigned int max_state;
-
- unsigned int *freq_table; /* In descending order */
-};
-
-/* devfreq cooling device callback functions are defined below */
-
-/**
- * devfreq_get_max_state - callback function to get the max cooling state.
- * @cdev: thermal cooling device pointer.
- * @state: fill this variable with the max cooling state.
- *
- * Callback for the thermal cooling device to return the devfreq
- * max cooling state.
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int devfreq_get_max_state(struct thermal_cooling_device *cdev,
- unsigned long *state)
-{
- struct devfreq_cooling_device *devfreq_device = cdev->devdata;
-
- *state = devfreq_device->max_state;
-
- return 0;
-}
-
-/**
- * devfreq_get_cur_state - callback function to get the current cooling state.
- * @cdev: thermal cooling device pointer.
- * @state: fill this variable with the current cooling state.
- *
- * Callback for the thermal cooling device to return the devfreq
- * current cooling state.
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int devfreq_get_cur_state(struct thermal_cooling_device *cdev,
- unsigned long *state)
-{
- struct devfreq_cooling_device *devfreq_device = cdev->devdata;
-
- *state = devfreq_device->cur_state;
-
- return 0;
-}
-
-/**
- * devfreq_set_cur_state - callback function to set the current cooling state.
- * @cdev: thermal cooling device pointer.
- * @state: set this variable to the current cooling state.
- *
- * Callback for the thermal cooling device to change the devfreq
- * current cooling state.
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int devfreq_set_cur_state(struct thermal_cooling_device *cdev,
- unsigned long state)
-{
- struct devfreq_cooling_device *devfreq_dev = cdev->devdata;
- unsigned int limited_freq;
- int ret;
-
- /* Request state should be less than max_level */
- if (WARN_ON(state > devfreq_dev->max_state))
- return -EINVAL;
-
- /* Check if the old cooling action is same as new cooling action */
- if (devfreq_dev->cur_state == state)
- return 0;
-
- limited_freq = devfreq_dev->freq_table[state];
-
- devfreq_dev->cur_state = state;
-
- /* Set the limited frequency to maximum frequency of devfreq */
- devfreq_dev->devfreq->max_freq = limited_freq;
- mutex_lock(&devfreq_dev->devfreq->lock);
- ret = update_devfreq(devfreq_dev->devfreq);
- mutex_unlock(&devfreq_dev->devfreq->lock);
-
- return ret;
-}
-
-/* Bind devfreq callbacks to thermal cooling device ops */
-static struct thermal_cooling_device_ops const devfreq_cooling_ops = {
- .get_max_state = devfreq_get_max_state,
- .get_cur_state = devfreq_get_cur_state,
- .set_cur_state = devfreq_set_cur_state,
-};
-
-/**
- * __devfreq_cooling_register - helper function to create devfreq cooling device
- * @np: a valid struct device_node to the cooling device tree node
- * @devfreq: the devfreq instance.
- *
- * This interface function registers the devfreq cooling device with the name
- * "thermal-devfreq-%x". This api can support multiple instances of devfreq
- * cooling devices. It also gives the opportunity to link the cooling device
- * with a device tree node, in order to bind it via the thermal DT code.
- *
- * Return: a valid struct thermal_cooling_device pointer on success,
- * on failure, it returns a corresponding ERR_PTR().
- */
-static struct thermal_cooling_device *
-__devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq)
-{
- struct thermal_cooling_device *cool_dev;
- struct devfreq_cooling_device *devfreq_dev;
- struct devfreq_dev_profile *devfreq_profile = devfreq->profile;
- struct dev_pm_opp *opp;
- static atomic_t devfreq_cooling_no = ATOMIC_INIT(-1);
- char dev_name[THERMAL_NAME_LENGTH];
- unsigned long freq;
- int i;
-
- devfreq_dev = kzalloc(sizeof(*devfreq_dev), GFP_KERNEL);
- if (!devfreq_dev)
- return ERR_PTR(-ENOMEM);
-
- rcu_read_lock();
- devfreq_dev->max_state = dev_pm_opp_get_opp_count(devfreq->dev.parent);
- if (devfreq_dev->max_state <= 0) {
- rcu_read_unlock();
- cool_dev = ERR_PTR(-EINVAL);
- goto free_cdev;
- }
- rcu_read_unlock();
-
- devfreq_dev->max_state -= 1;
-
- /*
- * Use the freq_table of devfreq_dev_profile structure
- * if the devfreq_dev_profile includes already filled frequency table.
- */
- if (devfreq_profile->freq_table) {
- devfreq_dev->freq_table = devfreq_profile->freq_table;
- goto register_cooling_dev;
- }
-
- /* Allocate the frequency table and fill it */
- rcu_read_lock();
- devfreq_dev->freq_table = kzalloc(sizeof(*devfreq_dev->freq_table) *
- devfreq_dev->max_state + 1, GFP_KERNEL);
- if (!devfreq_dev->freq_table) {
- rcu_read_unlock();
- cool_dev = ERR_PTR(-ENOMEM);
- goto free_cdev;
- }
-
- freq = ULONG_MAX;
- for (i = 0; i <= devfreq_dev->max_state; i++, freq--) {
- opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent,
- &freq);
- if (IS_ERR(opp)) {
- rcu_read_unlock();
- cool_dev = ERR_PTR(-EINVAL);
- goto free_table;
- }
- devfreq_dev->freq_table[i] = freq;
- }
- rcu_read_unlock();
-
-register_cooling_dev:
- /* Register cooling device with devfreq device */
- snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d",
- atomic_inc_return(&devfreq_cooling_no));
-
- cool_dev = thermal_of_cooling_device_register(np, dev_name, devfreq_dev,
- &devfreq_cooling_ops);
- if (IS_ERR(cool_dev))
- goto free_table;
-
- devfreq_dev->devfreq = devfreq;
- devfreq_dev->cool_dev = cool_dev;
-
- return cool_dev;
-
-free_table:
- kfree(devfreq_dev->freq_table);
-free_cdev:
- kfree(devfreq_dev);
-
- return cool_dev;
-}
-
-/**
- * of_devfreq_cooling_register - function to create devfreq cooling device.
- * @np: a valid struct device_node to the cooling device tree node
- * @devfreq: the devfreq instance.
- *
- * This interface function registers the devfreq cooling device with the name
- * "thermal-devfreq-%x". This api can support multiple instances of devfreq
- * cooling devices. Using this API, the devfreq cooling device will be
- * linked to the device tree node provided.
- *
- * Return: a valid struct thermal_cooling_device pointer on success,
- * on failure, it returns a corresponding ERR_PTR().
- */
-struct thermal_cooling_device *
-of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq)
-{
- if (!np || !devfreq)
- return ERR_PTR(-EINVAL);
-
- return __devfreq_cooling_register(np, devfreq);
-}
-EXPORT_SYMBOL_GPL(of_devfreq_cooling_register);
-
-/**
- * devfreq_cooling_register - function to create devfreq cooling device.
- * @devfreq: the devfreq instance.
- *
- * This interface function registers the devfreq cooling device with the name
- * "thermal-devfreq-%x". This api can support multiple instances of devfreq
- * cooling devices.
- *
- * Return: a valid struct thermal_cooling_device pointer on success,
- * on failure, it returns a corresponding ERR_PTR().
- */
-struct thermal_cooling_device *
-devfreq_cooling_register(struct devfreq *devfreq)
-{
- if (!devfreq)
- return ERR_PTR(-EINVAL);
-
- return __devfreq_cooling_register(NULL, devfreq);
-}
-EXPORT_SYMBOL_GPL(devfreq_cooling_register);
-
-/**
- * devfreq_cooling_unregister - function to remove devfreq cooling device.
- * @cdev: thermal cooling device pointer.
- *
- * This interface function unregisters the "thermal-devfreq-%x" cooling device.
- */
-void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
-{
- struct devfreq_cooling_device *devfreq_dev;
-
- if (!cdev)
- return;
-
- devfreq_dev = cdev->devdata;
-
- thermal_cooling_device_unregister(devfreq_dev->cool_dev);
- kfree(devfreq_dev->freq_table);
- kfree(devfreq_dev);
-}
-EXPORT_SYMBOL_GPL(devfreq_cooling_unregister);
+++ /dev/null
-/*
- * linux/include/linux/devfreq_cooling.h
- *
- * Copyright (C) 2015 Samsung Electronics Co., Ltd
- * Author: Chanwoo Choi <cw00.choi@samsung.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 __DEVFREQ_COOLING_H__
-#define __DEVFREQ_COOLING_H__
-
-#include <linux/of.h>
-#include <linux/thermal.h>
-#include <linux/devfreq.h>
-
-#ifdef CONFIG_DEVFREQ_THERMAL
-/**
- * devfreq_cooling_register - function to create cpufreq cooling device.
- * @devfreq: the devfreq instance.
- */
-struct thermal_cooling_device *
-devfreq_cooling_register(struct devfreq *devfreq);
-
-/**
- * of_devfreq_cooling_register - create cpufreq cooling device based on DT.
- * @np: a valid struct device_node to the cooling device tree node
- * @devfreq: the devfreq instance.
- */
-#ifdef CONFIG_THERMAL_OF
-struct thermal_cooling_device *
-of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq);
-#else
-static inline struct thermal_cooling_device *
-of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq)
-{
- return ERR_PTR(-ENOSYS);
-}
-#endif
-
-/**
- * devfreq_cooling_unregister - function to remove cpufreq cooling device.
- * @cdev: thermal cooling device pointer.
- */
-void devfreq_cooling_unregister(struct thermal_cooling_device *cdev);
-
-unsigned long devfreq_cooling_get_level(unsigned int cpu, unsigned int freq);
-#else /* !CONFIG_DEVFREQ_THERMAL */
-static inline struct thermal_cooling_device *
-devfreq_cooling_register(struct devfreq *devfreq)
-{
- return ERR_PTR(-ENOSYS);
-}
-static inline struct thermal_cooling_device *
-of_devfreq_cooling_register(struct device_node *np, struct devfreq *devfreq)
-{
- return ERR_PTR(-ENOSYS);
-}
-
-static inline
-void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
-{
- return;
-}
-#endif /* CONFIG_DEVFREQ_THERMAL */
-#endif /* __DEVFREQ_COOLING_H__ */
projects / platform / kernel / linux-exynos.git / commitdiff