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/*
* Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "device.h"
#include "common.h"
#define PROC_STAT "/proc/stat"
#define PROC_CPU_PRESENT "/sys/devices/system/cpu/present"
#define PROC_SCALING_CUR_FREQ "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq"
#define PROC_SCALING_MAX_FREQ "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq"
int device_cpu_get_count(int *cpu_cnt)
{
FILE *fp;
int ret;
int st, ed;
if (cpu_cnt == NULL)
return DEVICE_ERROR_INVALID_PARAMETER;
fp = fopen(PROC_CPU_PRESENT, "r");
if (!fp)
return DEVICE_ERROR_OPERATION_FAILED;
ret = fscanf(fp, "%u-%u", &st, &ed);
fclose(fp);
if (ret != 2)
return DEVICE_ERROR_OPERATION_FAILED;
*cpu_cnt = ed+1;
return DEVICE_ERROR_NONE;
}
static int _get_systime(device_system_time_s *st)
{
FILE *fp;
char buf[4096];
char *s;
assert(st);
fp = fopen(PROC_STAT, "r");
if (!fp)
return -1;
s = fgets(buf, sizeof(buf), fp);
fclose(fp);
if (!s)
return -1;
s = strchr(buf, ' ');
if (!s)
return -1;
s++;
st->user = strtol(s, &s, 10);
st->nice = strtol(s, &s, 10);
st->system = strtol(s, &s, 10);
st->idle = strtol(s, &s, 10);
st->iowait = strtol(s, &s, 10);
st->irq = strtol(s, &s, 10);
st->softirq = strtol(s, &s, 10);
return 0;
}
int device_cpu_get_system_time(device_system_time_s *time)
{
int ret;
device_system_time_s st;
if (time == NULL)
return DEVICE_ERROR_INVALID_PARAMETER;
ret = _get_systime(&st);
if (ret < 0)
return DEVICE_ERROR_OPERATION_FAILED;
st.total = st.user+st.nice+st.system+st.idle+st.iowait+st.irq+st.softirq;
*time = st;
return DEVICE_ERROR_NONE;
}
static int _get_uint(const char *path, unsigned int *val)
{
FILE *fp;
unsigned int num;
int ret;
assert(path);
assert(val);
fp = fopen(path, "r");
if (!fp)
return -1;
ret = fscanf(fp, "%u", &num);
fclose(fp);
if (ret != 1)
return -1;
*val = num;
return 0;
}
int device_cpu_get_current_freq(int cpu, unsigned int *cur_freq)
{
char path[FILENAME_MAX];
int ret;
int count;
unsigned int cur;
if (cur_freq == NULL)
return DEVICE_ERROR_INVALID_PARAMETER;
ret = device_cpu_get_count(&count);
if (ret != DEVICE_ERROR_NONE || cpu < 0 || cpu >= count)
return DEVICE_ERROR_INVALID_PARAMETER;
snprintf(path, sizeof(path), PROC_SCALING_CUR_FREQ, cpu);
ret = _get_uint(path, &cur);
if (ret < 0)
cur = 0;
*cur_freq = cur;
return DEVICE_ERROR_NONE;
}
int device_cpu_get_max_freq(int cpu, unsigned int *max_freq)
{
char path[FILENAME_MAX];
int ret;
int count;
unsigned int max;
if (max_freq == NULL)
return DEVICE_ERROR_INVALID_PARAMETER;
ret = device_cpu_get_count(&count);
if (ret != DEVICE_ERROR_NONE || cpu < 0 || cpu >= count)
return DEVICE_ERROR_INVALID_PARAMETER;
snprintf(path, sizeof(path), PROC_SCALING_MAX_FREQ, cpu);
ret = _get_uint(path, &max);
if (ret < 0)
max = 0;
*max_freq = max;
return DEVICE_ERROR_NONE;
}
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