sysfs.c File Reference

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "cpufreq.h"

Go to the source code of this file.

Macros
#define	PATH_TO_CPU   "/sys/devices/system/cpu/"
#define	MAX_LINE_LEN   4096
#define	SYSFS_PATH_MAX   255

Enumerations
enum	cpufreq_value {   CPUINFO_CUR_FREQ, CPUINFO_MIN_FREQ, CPUINFO_MAX_FREQ, CPUINFO_LATENCY,   SCALING_CUR_FREQ, SCALING_MIN_FREQ, SCALING_MAX_FREQ, STATS_NUM_TRANSITIONS,   MAX_CPUFREQ_VALUE_READ_FILES }
enum	cpufreq_string { SCALING_DRIVER, SCALING_GOVERNOR, MAX_CPUFREQ_STRING_FILES }
enum	cpufreq_write {   WRITE_SCALING_MIN_FREQ, WRITE_SCALING_MAX_FREQ, WRITE_SCALING_GOVERNOR, WRITE_SCALING_SET_SPEED,   MAX_CPUFREQ_WRITE_FILES }

Functions
unsigned long	sysfs_get_freq_kernel (unsigned int cpu)
unsigned long	sysfs_get_freq_hardware (unsigned int cpu)
unsigned long	sysfs_get_freq_transition_latency (unsigned int cpu)
int	sysfs_get_freq_hardware_limits (unsigned int cpu, unsigned long *min, unsigned long *max)
char *	sysfs_get_freq_driver (unsigned int cpu)
struct cpufreq_policy *	sysfs_get_freq_policy (unsigned int cpu)
struct cpufreq_available_governors *	sysfs_get_freq_available_governors (unsigned int cpu)
struct cpufreq_available_frequencies *	sysfs_get_available_frequencies (unsigned int cpu)
struct cpufreq_affected_cpus *	sysfs_get_freq_affected_cpus (unsigned int cpu)
struct cpufreq_affected_cpus *	sysfs_get_freq_related_cpus (unsigned int cpu)
struct cpufreq_stats *	sysfs_get_freq_stats (unsigned int cpu, unsigned long long *total_time)
unsigned long	sysfs_get_freq_transitions (unsigned int cpu)
int	sysfs_modify_freq_policy_governor (unsigned int cpu, char *governor)
int	sysfs_modify_freq_policy_max (unsigned int cpu, unsigned long max_freq)
int	sysfs_modify_freq_policy_min (unsigned int cpu, unsigned long min_freq)
int	sysfs_set_freq_policy (unsigned int cpu, struct cpufreq_policy *policy)
int	sysfs_set_frequency (unsigned int cpu, unsigned long target_frequency)
int	sysfs_cpu_exists (unsigned int cpu)

Macro Definition Documentation

#define MAX_LINE_LEN   4096

Definition at line 20 of file sysfs.c.

#define PATH_TO_CPU   "/sys/devices/system/cpu/"

Definition at line 19 of file sysfs.c.

#define SYSFS_PATH_MAX   255

Definition at line 21 of file sysfs.c.

Enumeration Type Documentation

enum cpufreq_string

Enumerator:

SCALING_DRIVER
SCALING_GOVERNOR
MAX_CPUFREQ_STRING_FILES

Definition at line 141 of file sysfs.c.

enum cpufreq_value

Enumerator:

CPUINFO_CUR_FREQ
CPUINFO_MIN_FREQ
CPUINFO_MAX_FREQ
CPUINFO_LATENCY
SCALING_CUR_FREQ
SCALING_MIN_FREQ
SCALING_MAX_FREQ
STATS_NUM_TRANSITIONS
MAX_CPUFREQ_VALUE_READ_FILES

Definition at line 90 of file sysfs.c.

enum cpufreq_write

Enumerator:

WRITE_SCALING_MIN_FREQ
WRITE_SCALING_MAX_FREQ
WRITE_SCALING_GOVERNOR
WRITE_SCALING_SET_SPEED
MAX_CPUFREQ_WRITE_FILES

Definition at line 180 of file sysfs.c.

Function Documentation

int sysfs_cpu_exists

(

unsigned int

cpu

)

Definition at line 659 of file sysfs.c.

struct cpufreq_available_frequencies* sysfs_get_available_frequencies ( unsigned int  cpu )

read

Definition at line 328 of file sysfs.c.

struct cpufreq_affected_cpus* sysfs_get_freq_affected_cpus ( unsigned int  cpu )

read

Definition at line 438 of file sysfs.c.

struct cpufreq_available_governors* sysfs_get_freq_available_governors ( unsigned int  cpu )

read

Definition at line 272 of file sysfs.c.

char* sysfs_get_freq_driver

(

unsigned int

cpu

)

Definition at line 242 of file sysfs.c.

unsigned long sysfs_get_freq_hardware

(

unsigned int

cpu

)

Definition at line 214 of file sysfs.c.

int sysfs_get_freq_hardware_limits	(	unsigned int	cpu,
		unsigned long *	min,
		unsigned long *	max
	)

Definition at line 224 of file sysfs.c.

unsigned long sysfs_get_freq_kernel

(

unsigned int

cpu

)

Definition at line 209 of file sysfs.c.

struct cpufreq_policy* sysfs_get_freq_policy ( unsigned int  cpu )

read

Definition at line 247 of file sysfs.c.

struct cpufreq_affected_cpus* sysfs_get_freq_related_cpus ( unsigned int  cpu )

read

Definition at line 443 of file sysfs.c.

struct cpufreq_stats* sysfs_get_freq_stats ( unsigned int  cpu, unsigned long long *  total_time  )

read

Definition at line 448 of file sysfs.c.

unsigned long sysfs_get_freq_transition_latency

(

unsigned int

cpu

)

Definition at line 219 of file sysfs.c.

unsigned long sysfs_get_freq_transitions

(

unsigned int

cpu

)

Definition at line 507 of file sysfs.c.

int sysfs_modify_freq_policy_governor	(	unsigned int	cpu,
		char *	governor
	)

Definition at line 547 of file sysfs.c.

int sysfs_modify_freq_policy_max	(	unsigned int	cpu,
		unsigned long	max_freq
	)

Definition at line 561 of file sysfs.c.

int sysfs_modify_freq_policy_min	(	unsigned int	cpu,
		unsigned long	min_freq
	)

Definition at line 572 of file sysfs.c.

int sysfs_set_freq_policy	(	unsigned int	cpu,
		struct cpufreq_policy *	policy
	)

Definition at line 583 of file sysfs.c.

int sysfs_set_frequency	(	unsigned int	cpu,
		unsigned long	target_frequency
	)

Definition at line 630 of file sysfs.c.