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/*
* Copyright (C) 2012 Texas Instruments, Inc
*
* 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.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/sysfs.h>
#include "sgxfreq.h"
static int activeidle_start(struct sgxfreq_sgx_data *data);
static void activeidle_stop(void);
static void activeidle_sgx_active(void);
static void activeidle_sgx_idle(void);
static struct activeidle_data {
unsigned long freq_active;
unsigned long freq_idle;
struct mutex mutex;
bool sgx_active;
} aid;
static struct sgxfreq_governor activeidle_gov = {
.name = "activeidle",
.gov_start = activeidle_start,
.gov_stop = activeidle_stop,
.sgx_active = activeidle_sgx_active,
.sgx_idle = activeidle_sgx_idle,
};
/*********************** begin sysfs interface ***********************/
extern struct kobject *sgxfreq_kobj;
static ssize_t show_freq_active(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lu\n", aid.freq_active);
}
static ssize_t store_freq_active(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned long freq;
ret = sscanf(buf, "%lu", &freq);
if (ret != 1)
return -EINVAL;
freq = sgxfreq_get_freq_ceil(freq);
mutex_lock(&aid.mutex);
aid.freq_active = freq;
if (aid.sgx_active)
sgxfreq_set_freq_request(aid.freq_active);
mutex_unlock(&aid.mutex);
return count;
}
static ssize_t show_freq_idle(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lu\n", aid.freq_idle);
}
static ssize_t store_freq_idle(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned long freq;
ret = sscanf(buf, "%lu", &freq);
if (ret != 1)
return -EINVAL;
freq = sgxfreq_get_freq_floor(freq);
mutex_lock(&aid.mutex);
aid.freq_idle = freq;
if (!aid.sgx_active)
sgxfreq_set_freq_request(aid.freq_idle);
mutex_unlock(&aid.mutex);
return count;
}
static DEVICE_ATTR(freq_active, 0644, show_freq_active, store_freq_active);
static DEVICE_ATTR(freq_idle, 0644, show_freq_idle, store_freq_idle);
static struct attribute *activeidle_attributes[] = {
&dev_attr_freq_active.attr,
&dev_attr_freq_idle.attr,
NULL
};
static struct attribute_group activeidle_attr_group = {
.attrs = activeidle_attributes,
.name = "activeidle",
};
/************************ end sysfs interface ************************/
int activeidle_init(void)
{
int ret;
mutex_init(&aid.mutex);
ret = sgxfreq_register_governor(&activeidle_gov);
if (ret)
return ret;
aid.freq_idle = sgxfreq_get_freq_min();
aid.freq_active = sgxfreq_get_freq_max();
return 0;
}
int activeidle_deinit(void)
{
return 0;
}
static int activeidle_start(struct sgxfreq_sgx_data *data)
{
int ret;
aid.sgx_active = data->active;
ret = sysfs_create_group(sgxfreq_kobj, &activeidle_attr_group);
if (ret)
return ret;
if (aid.sgx_active)
sgxfreq_set_freq_request(aid.freq_active);
else
sgxfreq_set_freq_request(aid.freq_idle);
return 0;
}
static void activeidle_stop(void)
{
sysfs_remove_group(sgxfreq_kobj, &activeidle_attr_group);
}
static void activeidle_sgx_active(void)
{
mutex_lock(&aid.mutex);
aid.sgx_active = true;
sgxfreq_set_freq_request(aid.freq_active);
mutex_unlock(&aid.mutex);
}
static void activeidle_sgx_idle(void)
{
mutex_lock(&aid.mutex);
aid.sgx_active = false;
sgxfreq_set_freq_request(aid.freq_idle);
mutex_unlock(&aid.mutex);
}
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