[CPUFREQ] Move kernel/cpufreq.c to drivers/cpufreq/cpufreq.c

Also remove $Id$ tag.
No other code change.

2 files changed, 0 insertions, 964 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 9bf11ae7195b..638a2f6c341c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -15,7 +15,6 @@ obj-$(CONFIG_UID16) += uid16.o
 obj-$(CONFIG_MODULES) += ksyms.o module.o
 obj-$(CONFIG_KALLSYMS) += kallsyms.o
 obj-$(CONFIG_PM) += power/
-obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
 obj-$(CONFIG_COMPAT) += compat.o
 obj-$(CONFIG_IKCONFIG) += configs.o
diff --git a/kernel/cpufreq.c b/kernel/cpufreq.c
deleted file mode 100644
index 7f80c321c785..000000000000
--- a/kernel/cpufreq.c
+++ /dev/null
@@ -1,963 +0,0 @@
-/*
- *  linux/kernel/cpufreq.c
- *
- *  Copyright (C) 2001 Russell King
- *            (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
- *
- *  $Id: cpufreq.c,v 1.59 2003/01/20 17:31:48 db Exp $
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/notifier.h>
-#include <linux/cpufreq.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/cpu.h>
-#include <linux/completion.h>
-
-/**
- * The "cpufreq driver" - the arch- or hardware-dependend low
- * level driver of CPUFreq support, and its spinlock. This lock
- * also protects the cpufreq_cpu_data array.
- */
-static struct cpufreq_driver   	*cpufreq_driver;
-static struct cpufreq_policy	*cpufreq_cpu_data[NR_CPUS];
-static spinlock_t		cpufreq_driver_lock = SPIN_LOCK_UNLOCKED;
-
-/* internal prototype */
-static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
-
-
-/**
- * Two notifier lists: the "policy" list is involved in the 
- * validation process for a new CPU frequency policy; the 
- * "transition" list for kernel code that needs to handle
- * changes to devices when the CPU clock speed changes.
- * The mutex locks both lists.
- */
-static struct notifier_block    *cpufreq_policy_notifier_list;
-static struct notifier_block    *cpufreq_transition_notifier_list;
-static DECLARE_RWSEM		(cpufreq_notifier_rwsem);
-
-
-static LIST_HEAD(cpufreq_governor_list);
-static DECLARE_MUTEX		(cpufreq_governor_sem);
-
-static struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
-{
-	struct cpufreq_policy *data;
-	unsigned long flags;
-
-	if (cpu >= NR_CPUS)
-		goto err_out;
-
-	/* get the cpufreq driver */
-	spin_lock_irqsave(&cpufreq_driver_lock, flags);
-
-	if (!cpufreq_driver)
-		goto err_out_unlock;
-
-	if (!try_module_get(cpufreq_driver->owner))
-		goto err_out_unlock;
-
-
-	/* get the CPU */
-	data = cpufreq_cpu_data[cpu];
-
-	if (!data)
-		goto err_out_put_module;
-
-	if (!kobject_get(&data->kobj))
-		goto err_out_put_module;
-
-
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	return data;
-
- err_out_put_module:
-	module_put(cpufreq_driver->owner);
- err_out_unlock:
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
- err_out:
-	return NULL;
-}
-
-static void cpufreq_cpu_put(struct cpufreq_policy *data)
-{
-	kobject_put(&data->kobj);
-	module_put(cpufreq_driver->owner);
-}
-
-/*********************************************************************
- *                          SYSFS INTERFACE                          *
- *********************************************************************/
-
-/**
- * cpufreq_parse_governor - parse a governor string
- */
-int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
-				struct cpufreq_governor **governor)
-{
-	if (!strnicmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
-		*policy = CPUFREQ_POLICY_PERFORMANCE;
-		return 0;
-	} else if (!strnicmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) {
-		*policy = CPUFREQ_POLICY_POWERSAVE;
-		return 0;
-	} else 	{
-		struct cpufreq_governor *t;
-		down(&cpufreq_governor_sem);
-		if (!cpufreq_driver || !cpufreq_driver->target)
-			goto out;
-		list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
-			if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) {
-				*governor = t;
-				*policy = CPUFREQ_POLICY_GOVERNOR;
-				up(&cpufreq_governor_sem);
-				return 0;
-			}
-		}
-	out:
-		up(&cpufreq_governor_sem);
-	}
-	return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(cpufreq_parse_governor);
-
-
-/* drivers/base/cpu.c */
-extern struct sysdev_class cpu_sysdev_class;
-
-
-/**
- * cpufreq_per_cpu_attr_read() / show_##file_name() - print out cpufreq information
- *
- * Write out information from cpufreq_driver->policy[cpu]; object must be
- * "unsigned int".
- */
-
-#define show_one(file_name, object)		 			\
-static ssize_t show_##file_name 					\
-(struct cpufreq_policy * policy, char *buf)				\
-{									\
-	return sprintf (buf, "%u\n", policy->object);			\
-}
-
-show_one(cpuinfo_min_freq, cpuinfo.min_freq);
-show_one(cpuinfo_max_freq, cpuinfo.max_freq);
-show_one(scaling_min_freq, min);
-show_one(scaling_max_freq, max);
-
-/**
- * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
- */
-#define store_one(file_name, object)			\
-static ssize_t store_##file_name					\
-(struct cpufreq_policy * policy, const char *buf, size_t count)		\
-{									\
-	unsigned int ret = -EINVAL;					\
-	struct cpufreq_policy new_policy;				\
-									\
-	ret = cpufreq_get_policy(&new_policy, policy->cpu);		\
-	if (ret)							\
-		return -EINVAL;						\
-									\
-	ret = sscanf (buf, "%u", &new_policy.object);			\
-	if (ret != 1)							\
-		return -EINVAL;						\
-									\
-	ret = cpufreq_set_policy(&new_policy);				\
-									\
-	return ret ? ret : count;					\
-}
-
-store_one(scaling_min_freq,min);
-store_one(scaling_max_freq,max);
-
-/**
- * show_scaling_governor - show the current policy for the specified CPU
- */
-static ssize_t show_scaling_governor (struct cpufreq_policy * policy, char *buf)
-{
-	switch (policy->policy) {
-	case CPUFREQ_POLICY_POWERSAVE:
-		return sprintf(buf, "powersave\n");
-	case CPUFREQ_POLICY_PERFORMANCE:
-		return sprintf(buf, "performance\n");
-	case CPUFREQ_POLICY_GOVERNOR:
-		return snprintf(buf, CPUFREQ_NAME_LEN, "%s\n", policy->governor->name);
-	default:
-		return -EINVAL;
-	}
-}
-
-
-/**
- * store_scaling_governor - store policy for the specified CPU
- */
-static ssize_t store_scaling_governor (struct cpufreq_policy * policy, 
-				       const char *buf, size_t count) 
-{
-	unsigned int ret = -EINVAL;
-	char	str_governor[16];
-	struct cpufreq_policy new_policy;
-
-	ret = cpufreq_get_policy(&new_policy, policy->cpu);
-	if (ret)
-		return ret;
-
-	ret = sscanf (buf, "%15s", str_governor);
-	if (ret != 1)
-		return -EINVAL;
-
-	if (cpufreq_parse_governor(str_governor, &new_policy.policy, &new_policy.governor))
-		return -EINVAL;
-
-	ret = cpufreq_set_policy(&new_policy);
-
-	return ret ? ret : count;
-}
-
-/**
- * show_scaling_driver - show the cpufreq driver currently loaded
- */
-static ssize_t show_scaling_driver (struct cpufreq_policy * policy, char *buf)
-{
-	return snprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name);
-}
-
-/**
- * show_scaling_available_governors - show the available CPUfreq governors
- */
-static ssize_t show_scaling_available_governors (struct cpufreq_policy * policy,
-				char *buf)
-{
-	ssize_t i = 0;
-	struct cpufreq_governor *t;
-
-	i += sprintf(buf, "performance powersave");
-
-	if (!cpufreq_driver->target)
-		goto out;
-
-	list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
-		if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2)))
-			goto out;
-		i += snprintf(&buf[i], CPUFREQ_NAME_LEN, " %s", t->name);
-	}
- out:
-	i += sprintf(&buf[i], "\n");
-	return i;
-}
-
-
-#define define_one_ro(_name) \
-struct freq_attr _name = { \
-	.attr = { .name = __stringify(_name), .mode = 0444 }, \
-	.show = show_##_name, \
-}
-
-#define define_one_rw(_name) \
-struct freq_attr _name = { \
-	.attr = { .name = __stringify(_name), .mode = 0644 }, \
-	.show = show_##_name, \
-	.store = store_##_name, \
-}
-
-define_one_ro(cpuinfo_min_freq);
-define_one_ro(cpuinfo_max_freq);
-define_one_ro(scaling_available_governors);
-define_one_ro(scaling_driver);
-define_one_rw(scaling_min_freq);
-define_one_rw(scaling_max_freq);
-define_one_rw(scaling_governor);
-
-static struct attribute * default_attrs[] = {
-	&cpuinfo_min_freq.attr,
-	&cpuinfo_max_freq.attr,
-	&scaling_min_freq.attr,
-	&scaling_max_freq.attr,
-	&scaling_governor.attr,
-	&scaling_driver.attr,
-	&scaling_available_governors.attr,
-	NULL
-};
-
-#define to_policy(k) container_of(k,struct cpufreq_policy,kobj)
-#define to_attr(a) container_of(a,struct freq_attr,attr)
-
-static ssize_t show(struct kobject * kobj, struct attribute * attr ,char * buf)
-{
-	struct cpufreq_policy * policy = to_policy(kobj);
-	struct freq_attr * fattr = to_attr(attr);
-	ssize_t ret;
-	policy = cpufreq_cpu_get(policy->cpu);
-	if (!policy)
-		return -EINVAL;
-	ret = fattr->show ? fattr->show(policy,buf) : 0;
-	cpufreq_cpu_put(policy);
-	return ret;
-}
-
-static ssize_t store(struct kobject * kobj, struct attribute * attr, 
-		     const char * buf, size_t count)
-{
-	struct cpufreq_policy * policy = to_policy(kobj);
-	struct freq_attr * fattr = to_attr(attr);
-	ssize_t ret;
-	policy = cpufreq_cpu_get(policy->cpu);
-	if (!policy)
-		return -EINVAL;
-	ret = fattr->store ? fattr->store(policy,buf,count) : 0;
-	cpufreq_cpu_put(policy);
-	return ret;
-}
-
-static void cpufreq_sysfs_release(struct kobject * kobj)
-{
-	struct cpufreq_policy * policy = to_policy(kobj);
-	complete(&policy->kobj_unregister);
-}
-
-static struct sysfs_ops sysfs_ops = {
-	.show	= show,
-	.store	= store,
-};
-
-static struct kobj_type ktype_cpufreq = {
-	.sysfs_ops	= &sysfs_ops,
-	.default_attrs	= default_attrs,
-	.release	= cpufreq_sysfs_release,
-};
-
-
-/**
- * cpufreq_add_dev - add a CPU device
- *
- * Adds the cpufreq interface for a CPU device. 
- */
-static int cpufreq_add_dev (struct sys_device * sys_dev)
-{
-	unsigned int cpu = sys_dev->id;
-	int ret = 0;
-	struct cpufreq_policy new_policy;
-	struct cpufreq_policy *policy;
-	struct freq_attr **drv_attr;
-	unsigned long flags;
-
-	if (!try_module_get(cpufreq_driver->owner))
-		return -EINVAL;
-
-	policy = kmalloc(sizeof(struct cpufreq_policy), GFP_KERNEL);
-	if (!policy)
-		return -ENOMEM;
-	memset(policy, 0, sizeof(struct cpufreq_policy));
-
-	policy->cpu = cpu;
-	init_MUTEX_LOCKED(&policy->lock);
-	init_completion(&policy->kobj_unregister);
-
-	/* call driver. From then on the cpufreq must be able
-	 * to accept all calls to ->verify and ->setpolicy for this CPU
-	 */
-	ret = cpufreq_driver->init(policy);
-	if (ret)
-		goto err_out;
-
-	memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
-
-	/* prepare interface data */
-	policy->kobj.parent = &sys_dev->kobj;
-	policy->kobj.ktype = &ktype_cpufreq;
-	strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
-
-	ret = kobject_register(&policy->kobj);
-	if (ret)
-		goto err_out;
-
-	/* set up files for this cpu device */
-	drv_attr = cpufreq_driver->attr;
-	while ((drv_attr) && (*drv_attr)) {
-		sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
-		drv_attr++;
-	}
-
-	spin_lock_irqsave(&cpufreq_driver_lock, flags);
-	cpufreq_cpu_data[cpu] = policy;
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	up(&policy->lock);
-	
-	/* set default policy */
-	ret = cpufreq_set_policy(&new_policy);
-	if (ret)
-		goto err_out_unregister;
-
-	module_put(cpufreq_driver->owner);
-	return 0;
-
-
- err_out_unregister:
-	spin_lock_irqsave(&cpufreq_driver_lock, flags);
-	cpufreq_cpu_data[cpu] = NULL;
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	kobject_unregister(&policy->kobj);
-	wait_for_completion(&policy->kobj_unregister);
-
- err_out:
-	kfree(policy);
-	module_put(cpufreq_driver->owner);
-	return ret;
-}
-
-
-/**
- * cpufreq_remove_dev - remove a CPU device
- *
- * Removes the cpufreq interface for a CPU device.
- */
-static int cpufreq_remove_dev (struct sys_device * sys_dev)
-{
-	unsigned int cpu = sys_dev->id;
-	unsigned long flags;
-	struct cpufreq_policy *data;
-
-	spin_lock_irqsave(&cpufreq_driver_lock, flags);
-	data = cpufreq_cpu_data[cpu];
-
-	if (!data) {
-		spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-		return -EINVAL;
-	}
-	cpufreq_cpu_data[cpu] = NULL;
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	if (!kobject_get(&data->kobj))
-		return -EFAULT;
-
-	kobject_unregister(&data->kobj);
-
-	kobject_put(&data->kobj);
-
-	/* we need to make sure that the underlying kobj is actually
-	 * not referenced anymore by anybody before we proceed with 
-	 * unloading.
-	 */
-	wait_for_completion(&data->kobj_unregister);
-
-	if (cpufreq_driver->target)
-		__cpufreq_governor(data, CPUFREQ_GOV_STOP);
-
-	if (cpufreq_driver->exit)
-		cpufreq_driver->exit(data);
-
-	kfree(data);
-
-	return 0;
-}
-
-/**
- *	cpufreq_resume - restore the CPU clock frequency after resume
- *
- *	Restore the CPU clock frequency so that our idea of the current
- *	frequency reflects the actual hardware.
- */
-static int cpufreq_resume(struct sys_device * sysdev)
-{
-	int cpu = sysdev->id;
-	unsigned int ret = 0;
-	struct cpufreq_policy *cpu_policy;
-
-	if (!cpu_online(cpu))
-		return 0;
-
-	/* we may be lax here as interrupts are off. Nonetheless
-	 * we need to grab the correct cpu policy, as to check
-	 * whether we really run on this CPU.
-	 */
-
-	cpu_policy = cpufreq_cpu_get(cpu);
-	if (!cpu_policy)
-		return -EINVAL;
-
-	if (cpufreq_driver->setpolicy)
-		ret = cpufreq_driver->setpolicy(cpu_policy);
-	else
-	/* CPUFREQ_RELATION_H or CPUFREQ_RELATION_L have the same effect here, as cpu_policy->cur is known
-	 * to be a valid and exact target frequency
-	 */
-		ret = cpufreq_driver->target(cpu_policy, cpu_policy->cur, CPUFREQ_RELATION_H);
-
-	cpufreq_cpu_put(cpu_policy);
-
-	return ret;
-}
-
-static struct sysdev_driver cpufreq_sysdev_driver = {
-	.add		= cpufreq_add_dev,
-	.remove		= cpufreq_remove_dev,
-	.resume		= cpufreq_resume,
-};
-
-
-/*********************************************************************
- *                     NOTIFIER LISTS INTERFACE                      *
- *********************************************************************/
-
-/**
- *	cpufreq_register_notifier - register a driver with cpufreq
- *	@nb: notifier function to register
- *      @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
- *
- *	Add a driver to one of two lists: either a list of drivers that 
- *      are notified about clock rate changes (once before and once after
- *      the transition), or a list of drivers that are notified about
- *      changes in cpufreq policy.
- *
- *	This function may sleep, and has the same return conditions as
- *	notifier_chain_register.
- */
-int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
-{
-	int ret;
-
-	down_write(&cpufreq_notifier_rwsem);
-	switch (list) {
-	case CPUFREQ_TRANSITION_NOTIFIER:
-		ret = notifier_chain_register(&cpufreq_transition_notifier_list, nb);
-		break;
-	case CPUFREQ_POLICY_NOTIFIER:
-		ret = notifier_chain_register(&cpufreq_policy_notifier_list, nb);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	up_write(&cpufreq_notifier_rwsem);
-
-	return ret;
-}
-EXPORT_SYMBOL(cpufreq_register_notifier);
-
-
-/**
- *	cpufreq_unregister_notifier - unregister a driver with cpufreq
- *	@nb: notifier block to be unregistered
- *      @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
- *
- *	Remove a driver from the CPU frequency notifier list.
- *
- *	This function may sleep, and has the same return conditions as
- *	notifier_chain_unregister.
- */
-int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
-{
-	int ret;
-
-	down_write(&cpufreq_notifier_rwsem);
-	switch (list) {
-	case CPUFREQ_TRANSITION_NOTIFIER:
-		ret = notifier_chain_unregister(&cpufreq_transition_notifier_list, nb);
-		break;
-	case CPUFREQ_POLICY_NOTIFIER:
-		ret = notifier_chain_unregister(&cpufreq_policy_notifier_list, nb);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	up_write(&cpufreq_notifier_rwsem);
-
-	return ret;
-}
-EXPORT_SYMBOL(cpufreq_unregister_notifier);
-
-
-/*********************************************************************
- *                              GOVERNORS                            *
- *********************************************************************/
-
-
-int __cpufreq_driver_target(struct cpufreq_policy *policy,
-			    unsigned int target_freq,
-			    unsigned int relation)
-{
-	return cpufreq_driver->target(policy, target_freq, relation);
-}
-EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
-
-
-int cpufreq_driver_target(struct cpufreq_policy *policy,
-			  unsigned int target_freq,
-			  unsigned int relation)
-{
-	unsigned int ret;
-
-	policy = cpufreq_cpu_get(policy->cpu);
-	if (!policy)
-		return -EINVAL;
-
-	down(&policy->lock);
-
-	ret = __cpufreq_driver_target(policy, target_freq, relation);
-
-	up(&policy->lock);
-
-	cpufreq_cpu_put(policy);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(cpufreq_driver_target);
-
-
-static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
-{
-	int ret = 0;
-
-	switch (policy->policy) {
-	case CPUFREQ_POLICY_POWERSAVE: 
-		if ((event == CPUFREQ_GOV_LIMITS) || (event == CPUFREQ_GOV_START)) {
-			ret = __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
-		}
-		break;
-	case CPUFREQ_POLICY_PERFORMANCE:
-		if ((event == CPUFREQ_GOV_LIMITS) || (event == CPUFREQ_GOV_START)) {
-			ret = __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
-		}
-		break;
-	case CPUFREQ_POLICY_GOVERNOR:
-		ret = -EINVAL;
-		if (!try_module_get(policy->governor->owner))
-			break;
-		ret = policy->governor->governor(policy, event);
-		/* we keep one module reference alive for each CPU governed by this CPU */
-		if ((event != CPUFREQ_GOV_START) || ret)
-			module_put(policy->governor->owner);
-		if ((event == CPUFREQ_GOV_STOP) && !ret)
-			module_put(policy->governor->owner);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-
-	return ret;
-}
-
-
-int cpufreq_governor(unsigned int cpu, unsigned int event)
-{
-	int ret = 0;
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
-
-	if (!policy)
-		return -EINVAL;
-
-	down(&policy->lock);
-	ret = __cpufreq_governor(policy, event);
-	up(&policy->lock);
-
-	cpufreq_cpu_put(policy);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(cpufreq_governor);
-
-
-int cpufreq_register_governor(struct cpufreq_governor *governor)
-{
-	struct cpufreq_governor *t;
-
-	if (!governor)
-		return -EINVAL;
-
-	if (!strnicmp(governor->name,"powersave",CPUFREQ_NAME_LEN))
-		return -EBUSY;
-	if (!strnicmp(governor->name,"performance",CPUFREQ_NAME_LEN))
-		return -EBUSY;
-
-	down(&cpufreq_governor_sem);
-	
-	list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
-		if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) {
-			up(&cpufreq_governor_sem);
-			return -EBUSY;
-		}
-	}
-	list_add(&governor->governor_list, &cpufreq_governor_list);
-
- 	up(&cpufreq_governor_sem);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cpufreq_register_governor);
-
-
-void cpufreq_unregister_governor(struct cpufreq_governor *governor)
-{
-	if (!governor)
-		return;
-
-	down(&cpufreq_governor_sem);
-	list_del(&governor->governor_list);
-	up(&cpufreq_governor_sem);
-	return;
-}
-EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
-
-
-
-/*********************************************************************
- *                          POLICY INTERFACE                         *
- *********************************************************************/
-
-/**
- * cpufreq_get_policy - get the current cpufreq_policy
- * @policy: struct cpufreq_policy into which the current cpufreq_policy is written
- *
- * Reads the current cpufreq policy.
- */
-int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
-{
-	struct cpufreq_policy *cpu_policy;
-	if (!policy)
-		return -EINVAL;
-
-	cpu_policy = cpufreq_cpu_get(cpu);
-	if (!cpu_policy)
-		return -EINVAL;
-
-	down(&cpu_policy->lock);
-	memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
-	up(&cpu_policy->lock);
-
-	cpufreq_cpu_put(cpu_policy);
-
-	return 0;
-}
-EXPORT_SYMBOL(cpufreq_get_policy);
-
-
-/**
- *	cpufreq_set_policy - set a new CPUFreq policy
- *	@policy: policy to be set.
- *
- *	Sets a new CPU frequency and voltage scaling policy.
- */
-int cpufreq_set_policy(struct cpufreq_policy *policy)
-{
-	int ret = 0;
-	struct cpufreq_policy *data;
-
-	if (!policy)
-		return -EINVAL;
-
-	data = cpufreq_cpu_get(policy->cpu);
-	if (!data)
-		return -EINVAL;
-
-	/* lock this CPU */
-	down(&data->lock);
-
-	memcpy(&policy->cpuinfo, 
-	       &data->cpuinfo, 
-	       sizeof(struct cpufreq_cpuinfo));
-
-	/* verify the cpu speed can be set within this limit */
-	ret = cpufreq_driver->verify(policy);
-	if (ret)
-		goto error_out;
-
-	down_read(&cpufreq_notifier_rwsem);
-
-	/* adjust if necessary - all reasons */
-	notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_ADJUST,
-			    policy);
-
-	/* adjust if necessary - hardware incompatibility*/
-	notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_INCOMPATIBLE,
-			    policy);
-
-	/* verify the cpu speed can be set within this limit,
-	   which might be different to the first one */
-	ret = cpufreq_driver->verify(policy);
-	if (ret) {
-		up_read(&cpufreq_notifier_rwsem);
-		goto error_out;
-	}
-
-	/* notification of the new policy */
-	notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_NOTIFY,
-			    policy);
-
-	up_read(&cpufreq_notifier_rwsem);
-
-	data->min    = policy->min;
-	data->max    = policy->max;
-
-	if (cpufreq_driver->setpolicy) {
-		data->policy = policy->policy;
-		ret = cpufreq_driver->setpolicy(policy);
-	} else {
-		if ((policy->policy != data->policy) || 
-		    ((policy->policy == CPUFREQ_POLICY_GOVERNOR) && (policy->governor != data->governor))) {
-			/* save old, working values */
-			unsigned int old_pol = data->policy;
-			struct cpufreq_governor *old_gov = data->governor;
-
-			/* end old governor */
-			__cpufreq_governor(data, CPUFREQ_GOV_STOP);
-
-			/* start new governor */
-			data->policy = policy->policy;
-			data->governor = policy->governor;
-			if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
-				/* new governor failed, so re-start old one */
-				data->policy = old_pol;
-				data->governor = old_gov;
-				__cpufreq_governor(data, CPUFREQ_GOV_START);
-			}
-			/* might be a policy change, too, so fall through */
-		}
-		__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
-	}
-
- error_out:
-	up(&data->lock);
-	cpufreq_cpu_put(data);
-
-	return ret;
-}
-EXPORT_SYMBOL(cpufreq_set_policy);
-
-
-
-/*********************************************************************
- *            EXTERNALLY AFFECTING FREQUENCY CHANGES                 *
- *********************************************************************/
-
-/**
- * adjust_jiffies - adjust the system "loops_per_jiffy"
- *
- * This function alters the system "loops_per_jiffy" for the clock
- * speed change. Note that loops_per_jiffy cannot be updated on SMP
- * systems as each CPU might be scaled differently. So, use the arch 
- * per-CPU loops_per_jiffy value wherever possible.
- */
-#ifndef CONFIG_SMP
-static unsigned long l_p_j_ref;
-static unsigned int  l_p_j_ref_freq;
-
-static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
-{
-	if (!l_p_j_ref_freq) {
-		l_p_j_ref = loops_per_jiffy;
-		l_p_j_ref_freq = ci->old;
-	}
-	if ((val == CPUFREQ_PRECHANGE  && ci->old < ci->new) ||
-	    (val == CPUFREQ_POSTCHANGE && ci->old > ci->new))
-		loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, ci->new);
-}
-#else
-#define adjust_jiffies(x...) do {} while (0)
-#endif
-
-
-/**
- * cpufreq_notify_transition - call notifier chain and adjust_jiffies on frequency transition
- *
- * This function calls the transition notifiers and the "adjust_jiffies" function. It is called
- * twice on all CPU frequency changes that have external effects. 
- */
-void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
-{
-	if (irqs_disabled())
-		return;   /* Only valid if we're in the resume process where
-			   * everyone knows what CPU frequency we are at */
-
-	down_read(&cpufreq_notifier_rwsem);
-	switch (state) {
-	case CPUFREQ_PRECHANGE:
-		notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_PRECHANGE, freqs);
-		adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
-		break;
-	case CPUFREQ_POSTCHANGE:
-		adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
-		notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs);
-		cpufreq_cpu_data[freqs->cpu]->cur = freqs->new;
-		break;
-	}
-	up_read(&cpufreq_notifier_rwsem);
-}
-EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
-
-
-
-/*********************************************************************
- *               REGISTER / UNREGISTER CPUFREQ DRIVER                *
- *********************************************************************/
-
-/**
- * cpufreq_register_driver - register a CPU Frequency driver
- * @driver_data: A struct cpufreq_driver containing the values#
- * submitted by the CPU Frequency driver.
- *
- *   Registers a CPU Frequency driver to this core code. This code 
- * returns zero on success, -EBUSY when another driver got here first
- * (and isn't unregistered in the meantime). 
- *
- */
-int cpufreq_register_driver(struct cpufreq_driver *driver_data)
-{
-	unsigned long flags;
-
-	if (!driver_data || !driver_data->verify || !driver_data->init ||
-	    ((!driver_data->setpolicy) && (!driver_data->target)))
-		return -EINVAL;
-
-	spin_lock_irqsave(&cpufreq_driver_lock, flags);
-	if (cpufreq_driver) {
-		spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-		return -EBUSY;
-	}
-	cpufreq_driver = driver_data;
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	return sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
-}
-EXPORT_SYMBOL_GPL(cpufreq_register_driver);
-
-
-/**
- * cpufreq_unregister_driver - unregister the current CPUFreq driver
- *
- *    Unregister the current CPUFreq driver. Only call this if you have 
- * the right to do so, i.e. if you have succeeded in initialising before!
- * Returns zero if successful, and -EINVAL if the cpufreq_driver is
- * currently not initialised.
- */
-int cpufreq_unregister_driver(struct cpufreq_driver *driver)
-{
-	unsigned long flags;
-
-	if (!cpufreq_driver || (driver != cpufreq_driver))
-		return -EINVAL;
-
-	sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
-
-	spin_lock_irqsave(&cpufreq_driver_lock, flags);
-	cpufreq_driver = NULL;
-	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);