cpupower/library_cleanup.patch

diff --git a/Makefile b/Makefile
index 0adaf0c..8358863 100644
--- a/Makefile
+++ b/Makefile
@@ -63,7 +63,7 @@ DESTDIR ?=
 # and _should_ modify the PACKAGE_BUGREPORT definition
 
 VERSION=			$(shell ./utils/version-gen.sh)
-LIB_MAJ=			0.0.0
+LIB_MAJ=			0.0.1
 LIB_MIN=			0
 
 PACKAGE =			cpupower
@@ -129,7 +129,7 @@ WARNINGS += -Wshadow
 CFLAGS += -DVERSION=\"$(VERSION)\" -DPACKAGE=\"$(PACKAGE)\" \
 		-DPACKAGE_BUGREPORT=\"$(PACKAGE_BUGREPORT)\" -D_GNU_SOURCE
 
-UTIL_OBJS =  utils/helpers/amd.o utils/helpers/topology.o utils/helpers/msr.o \
+UTIL_OBJS =  utils/helpers/amd.o utils/helpers/msr.o \
 	utils/helpers/sysfs.o utils/helpers/misc.o utils/helpers/cpuid.o \
 	utils/helpers/pci.o utils/helpers/bitmask.o \
 	utils/idle_monitor/nhm_idle.o utils/idle_monitor/snb_idle.o \
@@ -148,9 +148,9 @@ UTIL_HEADERS = utils/helpers/helpers.h utils/idle_monitor/cpupower-monitor.h \
 	utils/helpers/bitmask.h \
 	utils/idle_monitor/idle_monitors.h utils/idle_monitor/idle_monitors.def
 
-LIB_HEADERS = 	lib/cpufreq.h lib/sysfs.h
-LIB_SRC = 	lib/cpufreq.c lib/sysfs.c
-LIB_OBJS = 	lib/cpufreq.o lib/sysfs.o
+LIB_HEADERS = 	lib/cpufreq.h lib/cpupower.h lib/cpuidle.h
+LIB_SRC = 	lib/cpufreq.c lib/cpupower.c lib/cpuidle.c
+LIB_OBJS = 	lib/cpufreq.o lib/cpupower.o lib/cpuidle.o
 LIB_OBJS :=	$(addprefix $(OUTPUT),$(LIB_OBJS))
 
 CFLAGS +=	-pipe
@@ -280,6 +280,7 @@ install-lib:
 	$(CP) $(OUTPUT)libcpupower.so* $(DESTDIR)${libdir}/
 	$(INSTALL) -d $(DESTDIR)${includedir}
 	$(INSTALL_DATA) lib/cpufreq.h $(DESTDIR)${includedir}/cpufreq.h
+	$(INSTALL_DATA) lib/cpuidle.h $(DESTDIR)${includedir}/cpuidle.h
 
 install-tools:
 	$(INSTALL) -d $(DESTDIR)${bindir}
@@ -315,6 +316,7 @@ endif
 uninstall:
 	- rm -f $(DESTDIR)${libdir}/libcpupower.*
 	- rm -f $(DESTDIR)${includedir}/cpufreq.h
+	- rm -f $(DESTDIR)${includedir}/cpuidle.h
 	- rm -f $(DESTDIR)${bindir}/utils/cpupower
 	- rm -f $(DESTDIR)${mandir}/man1/cpupower.1
 	- rm -f $(DESTDIR)${mandir}/man1/cpupower-frequency-set.1
diff --git a/bench/system.c b/bench/system.c
index f01e3f4..c25a74a 100644
--- a/bench/system.c
+++ b/bench/system.c
@@ -26,6 +26,7 @@
 #include <sched.h>
 
 #include <cpufreq.h>
+#include <cpupower.h>
 
 #include "config.h"
 #include "system.h"
@@ -60,7 +61,7 @@ int set_cpufreq_governor(char *governor, unsigned int cpu)
 
 	dprintf("set %s as cpufreq governor\n", governor);
 
-	if (cpufreq_cpu_exists(cpu) != 0) {
+	if (cpupower_is_cpu_online(cpu) != 0) {
 		perror("cpufreq_cpu_exists");
 		fprintf(stderr, "error: cpu %u does not exist\n", cpu);
 		return -1;
diff --git a/lib/cpufreq.c b/lib/cpufreq.c
index d961101..1b993fe 100644
--- a/lib/cpufreq.c
+++ b/lib/cpufreq.c
@@ -9,28 +9,190 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 #include "cpufreq.h"
-#include "sysfs.h"
+#include "cpupower_intern.h"
 
-int cpufreq_cpu_exists(unsigned int cpu)
+/* CPUFREQ sysfs access **************************************************/
+
+/* helper function to read file from /sys into given buffer */
+/* fname is a relative path under "cpuX/cpufreq" dir */
+static unsigned int sysfs_cpufreq_read_file(unsigned int cpu, const char *fname,
+					    char *buf, size_t buflen)
 {
-	return sysfs_cpu_exists(cpu);
+	char path[SYSFS_PATH_MAX];
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
+			 cpu, fname);
+	return sysfs_read_file(path, buf, buflen);
 }
 
+/* helper function to write a new value to a /sys file */
+/* fname is a relative path under "cpuX/cpufreq" dir */
+static unsigned int sysfs_cpufreq_write_file(unsigned int cpu,
+					     const char *fname,
+					     const char *value, size_t len)
+{
+	char path[SYSFS_PATH_MAX];
+	int fd;
+	ssize_t numwrite;
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
+			 cpu, fname);
+
+	fd = open(path, O_WRONLY);
+	if (fd == -1)
+		return 0;
+
+	numwrite = write(fd, value, len);
+	if (numwrite < 1) {
+		close(fd);
+		return 0;
+	}
+
+	close(fd);
+
+	return (unsigned int) numwrite;
+}
+
+/* read access to files which contain one numeric value */
+
+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
+};
+
+static const char *cpufreq_value_files[MAX_CPUFREQ_VALUE_READ_FILES] = {
+	[CPUINFO_CUR_FREQ] = "cpuinfo_cur_freq",
+	[CPUINFO_MIN_FREQ] = "cpuinfo_min_freq",
+	[CPUINFO_MAX_FREQ] = "cpuinfo_max_freq",
+	[CPUINFO_LATENCY]  = "cpuinfo_transition_latency",
+	[SCALING_CUR_FREQ] = "scaling_cur_freq",
+	[SCALING_MIN_FREQ] = "scaling_min_freq",
+	[SCALING_MAX_FREQ] = "scaling_max_freq",
+	[STATS_NUM_TRANSITIONS] = "stats/total_trans"
+};
+
+
+static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
+						 enum cpufreq_value which)
+{
+	unsigned long value;
+	unsigned int len;
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+
+	if (which >= MAX_CPUFREQ_VALUE_READ_FILES)
+		return 0;
+
+	len = sysfs_cpufreq_read_file(cpu, cpufreq_value_files[which],
+				linebuf, sizeof(linebuf));
+
+	if (len == 0)
+		return 0;
+
+	value = strtoul(linebuf, &endp, 0);
+
+	if (endp == linebuf || errno == ERANGE)
+		return 0;
+
+	return value;
+}
+
+/* read access to files which contain one string */
+
+enum cpufreq_string {
+	SCALING_DRIVER,
+	SCALING_GOVERNOR,
+	MAX_CPUFREQ_STRING_FILES
+};
+
+static const char *cpufreq_string_files[MAX_CPUFREQ_STRING_FILES] = {
+	[SCALING_DRIVER] = "scaling_driver",
+	[SCALING_GOVERNOR] = "scaling_governor",
+};
+
+
+static char *sysfs_cpufreq_get_one_string(unsigned int cpu,
+					   enum cpufreq_string which)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *result;
+	unsigned int len;
+
+	if (which >= MAX_CPUFREQ_STRING_FILES)
+		return NULL;
+
+	len = sysfs_cpufreq_read_file(cpu, cpufreq_string_files[which],
+				linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	result = strdup(linebuf);
+	if (result == NULL)
+		return NULL;
+
+	if (result[strlen(result) - 1] == '\n')
+		result[strlen(result) - 1] = '\0';
+
+	return result;
+}
+
+/* write access */
+
+enum cpufreq_write {
+	WRITE_SCALING_MIN_FREQ,
+	WRITE_SCALING_MAX_FREQ,
+	WRITE_SCALING_GOVERNOR,
+	WRITE_SCALING_SET_SPEED,
+	MAX_CPUFREQ_WRITE_FILES
+};
+
+static const char *cpufreq_write_files[MAX_CPUFREQ_WRITE_FILES] = {
+	[WRITE_SCALING_MIN_FREQ] = "scaling_min_freq",
+	[WRITE_SCALING_MAX_FREQ] = "scaling_max_freq",
+	[WRITE_SCALING_GOVERNOR] = "scaling_governor",
+	[WRITE_SCALING_SET_SPEED] = "scaling_setspeed",
+};
+
+static int sysfs_cpufreq_write_one_value(unsigned int cpu,
+					 enum cpufreq_write which,
+					 const char *new_value, size_t len)
+{
+	if (which >= MAX_CPUFREQ_WRITE_FILES)
+		return 0;
+
+	if (sysfs_cpufreq_write_file(cpu, cpufreq_write_files[which],
+					new_value, len) != len)
+		return -ENODEV;
+
+	return 0;
+};
+
 unsigned long cpufreq_get_freq_kernel(unsigned int cpu)
 {
-	return sysfs_get_freq_kernel(cpu);
+	return sysfs_cpufreq_get_one_value(cpu, SCALING_CUR_FREQ);
 }
 
 unsigned long cpufreq_get_freq_hardware(unsigned int cpu)
 {
-	return sysfs_get_freq_hardware(cpu);
+	return sysfs_cpufreq_get_one_value(cpu, CPUINFO_CUR_FREQ);
 }
 
 unsigned long cpufreq_get_transition_latency(unsigned int cpu)
 {
-	return sysfs_get_freq_transition_latency(cpu);
+	return sysfs_cpufreq_get_one_value(cpu, CPUINFO_LATENCY);
 }
 
 int cpufreq_get_hardware_limits(unsigned int cpu,
@@ -39,12 +201,21 @@ int cpufreq_get_hardware_limits(unsigned int cpu,
 {
 	if ((!min) || (!max))
 		return -EINVAL;
-	return sysfs_get_freq_hardware_limits(cpu, min, max);
+
+	*min = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MIN_FREQ);
+	if (!*min)
+		return -ENODEV;
+
+	*max = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MAX_FREQ);
+	if (!*max)
+		return -ENODEV;
+
+	return 0;
 }
 
 char *cpufreq_get_driver(unsigned int cpu)
 {
-	return sysfs_get_freq_driver(cpu);
+	return sysfs_cpufreq_get_one_string(cpu, SCALING_DRIVER);
 }
 
 void cpufreq_put_driver(char *ptr)
@@ -56,7 +227,26 @@ void cpufreq_put_driver(char *ptr)
 
 struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu)
 {
-	return sysfs_get_freq_policy(cpu);
+	struct cpufreq_policy *policy;
+
+	policy = malloc(sizeof(struct cpufreq_policy));
+	if (!policy)
+		return NULL;
+
+	policy->governor = sysfs_cpufreq_get_one_string(cpu, SCALING_GOVERNOR);
+	if (!policy->governor) {
+		free(policy);
+		return NULL;
+	}
+	policy->min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);
+	policy->max = sysfs_cpufreq_get_one_value(cpu, SCALING_MAX_FREQ);
+	if ((!policy->min) || (!policy->max)) {
+		free(policy->governor);
+		free(policy);
+		return NULL;
+	}
+
+	return policy;
 }
 
 void cpufreq_put_policy(struct cpufreq_policy *policy)
@@ -72,7 +262,57 @@ void cpufreq_put_policy(struct cpufreq_policy *policy)
 struct cpufreq_available_governors *cpufreq_get_available_governors(unsigned
 								int cpu)
 {
-	return sysfs_get_freq_available_governors(cpu);
+	struct cpufreq_available_governors *first = NULL;
+	struct cpufreq_available_governors *current = NULL;
+	char linebuf[MAX_LINE_LEN];
+	unsigned int pos, i;
+	unsigned int len;
+
+	len = sysfs_cpufreq_read_file(cpu, "scaling_available_governors",
+				linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	pos = 0;
+	for (i = 0; i < len; i++) {
+		if (linebuf[i] == ' ' || linebuf[i] == '\n') {
+			if (i - pos < 2)
+				continue;
+			if (current) {
+				current->next = malloc(sizeof(*current));
+				if (!current->next)
+					goto error_out;
+				current = current->next;
+			} else {
+				first = malloc(sizeof(*first));
+				if (!first)
+					goto error_out;
+				current = first;
+			}
+			current->first = first;
+			current->next = NULL;
+
+			current->governor = malloc(i - pos + 1);
+			if (!current->governor)
+				goto error_out;
+
+			memcpy(current->governor, linebuf + pos, i - pos);
+			current->governor[i - pos] = '\0';
+			pos = i + 1;
+		}
+	}
+
+	return first;
+
+ error_out:
+	while (first) {
+		current = first->next;
+		if (first->governor)
+			free(first->governor);
+		free(first);
+		first = current;
+	}
+	return NULL;
 }
 
 void cpufreq_put_available_governors(struct cpufreq_available_governors *any)
@@ -96,7 +336,57 @@ void cpufreq_put_available_governors(struct cpufreq_available_governors *any)
 struct cpufreq_available_frequencies
 *cpufreq_get_available_frequencies(unsigned int cpu)
 {
-	return sysfs_get_available_frequencies(cpu);
+	struct cpufreq_available_frequencies *first = NULL;
+	struct cpufreq_available_frequencies *current = NULL;
+	char one_value[SYSFS_PATH_MAX];
+	char linebuf[MAX_LINE_LEN];
+	unsigned int pos, i;
+	unsigned int len;
+
+	len = sysfs_cpufreq_read_file(cpu, "scaling_available_frequencies",
+				linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	pos = 0;
+	for (i = 0; i < len; i++) {
+		if (linebuf[i] == ' ' || linebuf[i] == '\n') {
+			if (i - pos < 2)
+				continue;
+			if (i - pos >= SYSFS_PATH_MAX)
+				goto error_out;
+			if (current) {
+				current->next = malloc(sizeof(*current));
+				if (!current->next)
+					goto error_out;
+				current = current->next;
+			} else {
+				first = malloc(sizeof(*first));
+				if (!first)
+					goto error_out;
+				current = first;
+			}
+			current->first = first;
+			current->next = NULL;
+
+			memcpy(one_value, linebuf + pos, i - pos);
+			one_value[i - pos] = '\0';
+			if (sscanf(one_value, "%lu", &current->frequency) != 1)
+				goto error_out;
+
+			pos = i + 1;
+		}
+	}
+
+	return first;
+
+ error_out:
+	while (first) {
+		current = first->next;
+		free(first);
+		first = current;
+	}
+	return NULL;
 }
 
 void cpufreq_put_available_frequencies(struct cpufreq_available_frequencies
@@ -114,10 +404,65 @@ void cpufreq_put_available_frequencies(struct cpufreq_available_frequencies
 	}
 }
 
+static struct cpufreq_affected_cpus *sysfs_get_cpu_list(unsigned int cpu,
+							const char *file)
+{
+	struct cpufreq_affected_cpus *first = NULL;
+	struct cpufreq_affected_cpus *current = NULL;
+	char one_value[SYSFS_PATH_MAX];
+	char linebuf[MAX_LINE_LEN];
+	unsigned int pos, i;
+	unsigned int len;
+
+	len = sysfs_cpufreq_read_file(cpu, file, linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	pos = 0;
+	for (i = 0; i < len; i++) {
+		if (i == len || linebuf[i] == ' ' || linebuf[i] == '\n') {
+			if (i - pos  < 1)
+				continue;
+			if (i - pos >= SYSFS_PATH_MAX)
+				goto error_out;
+			if (current) {
+				current->next = malloc(sizeof(*current));
+				if (!current->next)
+					goto error_out;
+				current = current->next;
+			} else {
+				first = malloc(sizeof(*first));
+				if (!first)
+					goto error_out;
+				current = first;
+			}
+			current->first = first;
+			current->next = NULL;
+
+			memcpy(one_value, linebuf + pos, i - pos);
+			one_value[i - pos] = '\0';
+
+			if (sscanf(one_value, "%u", &current->cpu) != 1)
+				goto error_out;
+
+			pos = i + 1;
+		}
+	}
+
+	return first;
+
+ error_out:
+	while (first) {
+		current = first->next;
+		free(first);
+		first = current;
+	}
+	return NULL;
+}
 
 struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned int cpu)
 {
-	return sysfs_get_freq_affected_cpus(cpu);
+	return sysfs_get_cpu_list(cpu, "affected_cpus");
 }
 
 void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *any)
@@ -138,7 +483,7 @@ void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *any)
 
 struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned int cpu)
 {
-	return sysfs_get_freq_related_cpus(cpu);
+	return sysfs_get_cpu_list(cpu, "related_cpus");
 }
 
 void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *any)
@@ -146,45 +491,208 @@ void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *any)
 	cpufreq_put_affected_cpus(any);
 }
 
+static int verify_gov(char *new_gov, char *passed_gov)
+{
+	unsigned int i, j = 0;
+
+	if (!passed_gov || (strlen(passed_gov) > 19))
+		return -EINVAL;
+
+	strncpy(new_gov, passed_gov, 20);
+	for (i = 0; i < 20; i++) {
+		if (j) {
+			new_gov[i] = '\0';
+			continue;
+		}
+		if ((new_gov[i] >= 'a') && (new_gov[i] <= 'z'))
+			continue;
+
+		if ((new_gov[i] >= 'A') && (new_gov[i] <= 'Z'))
+			continue;
+
+		if (new_gov[i] == '-')
+			continue;
+
+		if (new_gov[i] == '_')
+			continue;
+
+		if (new_gov[i] == '\0') {
+			j = 1;
+			continue;
+		}
+		return -EINVAL;
+	}
+	new_gov[19] = '\0';
+	return 0;
+}
 
 int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy)
 {
+	char min[SYSFS_PATH_MAX];
+	char max[SYSFS_PATH_MAX];
+	char gov[SYSFS_PATH_MAX];
+	int ret;
+	unsigned long old_min;
+	int write_max_first;
+
 	if (!policy || !(policy->governor))
 		return -EINVAL;
 
-	return sysfs_set_freq_policy(cpu, policy);
+	if (policy->max < policy->min)
+		return -EINVAL;
+
+	if (verify_gov(gov, policy->governor))
+		return -EINVAL;
+
+	snprintf(min, SYSFS_PATH_MAX, "%lu", policy->min);
+	snprintf(max, SYSFS_PATH_MAX, "%lu", policy->max);
+
+	old_min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);
+	write_max_first = (old_min && (policy->max < old_min) ? 0 : 1);
+
+	if (write_max_first) {
+		ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
+						    max, strlen(max));
+		if (ret)
+			return ret;
+	}
+
+	ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ, min,
+					    strlen(min));
+	if (ret)
+		return ret;
+
+	if (!write_max_first) {
+		ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
+						    max, strlen(max));
+		if (ret)
+			return ret;
+	}
+
+	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR,
+					     gov, strlen(gov));
 }
 
 
 int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq)
 {
-	return sysfs_modify_freq_policy_min(cpu, min_freq);
+	char value[SYSFS_PATH_MAX];
+
+	snprintf(value, SYSFS_PATH_MAX, "%lu", min_freq);
+
+	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ,
+					     value, strlen(value));
 }
 
 
 int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq)
 {
-	return sysfs_modify_freq_policy_max(cpu, max_freq);
-}
+	char value[SYSFS_PATH_MAX];
+
+	snprintf(value, SYSFS_PATH_MAX, "%lu", max_freq);
 
+	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
+					     value, strlen(value));
+}
 
 int cpufreq_modify_policy_governor(unsigned int cpu, char *governor)
 {
+	char new_gov[SYSFS_PATH_MAX];
+
 	if ((!governor) || (strlen(governor) > 19))
 		return -EINVAL;
 
-	return sysfs_modify_freq_policy_governor(cpu, governor);
+	if (verify_gov(new_gov, governor))
+		return -EINVAL;
+
+	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR,
+					     new_gov, strlen(new_gov));
 }
 
 int cpufreq_set_frequency(unsigned int cpu, unsigned long target_frequency)
 {
-	return sysfs_set_frequency(cpu, target_frequency);
+	struct cpufreq_policy *pol = cpufreq_get_policy(cpu);
+	char userspace_gov[] = "userspace";
+	char freq[SYSFS_PATH_MAX];
+	int ret;
+
+	if (!pol)
+		return -ENODEV;
+
+	if (strncmp(pol->governor, userspace_gov, 9) != 0) {
+		ret = cpufreq_modify_policy_governor(cpu, userspace_gov);
+		if (ret) {
+			cpufreq_put_policy(pol);
+			return ret;
+		}
+	}
+
+	cpufreq_put_policy(pol);
+
+	snprintf(freq, SYSFS_PATH_MAX, "%lu", target_frequency);
+
+	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_SET_SPEED,
+					     freq, strlen(freq));
 }
 
 struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
 					unsigned long long *total_time)
 {
-	return sysfs_get_freq_stats(cpu, total_time);
+	struct cpufreq_stats *first = NULL;
+	struct cpufreq_stats *current = NULL;
+	char one_value[SYSFS_PATH_MAX];
+	char linebuf[MAX_LINE_LEN];
+	unsigned int pos, i;
+	unsigned int len;
+
+	len = sysfs_cpufreq_read_file(cpu, "stats/time_in_state",
+				linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	*total_time = 0;
+	pos = 0;
+	for (i = 0; i < len; i++) {
+		if (i == strlen(linebuf) || linebuf[i] == '\n')	{
+			if (i - pos < 2)
+				continue;
+			if ((i - pos) >= SYSFS_PATH_MAX)
+				goto error_out;
+			if (current) {
+				current->next = malloc(sizeof(*current));
+				if (!current->next)
+					goto error_out;
+				current = current->next;
+			} else {
+				first = malloc(sizeof(*first));
+				if (!first)
+					goto error_out;
+				current = first;
+			}
+			current->first = first;
+			current->next = NULL;
+
+			memcpy(one_value, linebuf + pos, i - pos);
+			one_value[i - pos] = '\0';
+			if (sscanf(one_value, "%lu %llu",
+					&current->frequency,
+					&current->time_in_state) != 2)
+				goto error_out;
+
+			*total_time = *total_time + current->time_in_state;
+			pos = i + 1;
+		}
+	}
+
+	return first;
+
+ error_out:
+	while (first) {
+		current = first->next;
+		free(first);
+		first = current;
+	}
+	return NULL;
 }
 
 void cpufreq_put_stats(struct cpufreq_stats *any)
@@ -204,5 +712,5 @@ void cpufreq_put_stats(struct cpufreq_stats *any)
 
 unsigned long cpufreq_get_transitions(unsigned int cpu)
 {
-	return sysfs_get_freq_transitions(cpu);
+	return sysfs_cpufreq_get_one_value(cpu, STATS_NUM_TRANSITIONS);
 }
diff --git a/lib/cpufreq.h b/lib/cpufreq.h
index 3aae8e7..3b005c3 100644
--- a/lib/cpufreq.h
+++ b/lib/cpufreq.h
@@ -17,8 +17,8 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef _CPUFREQ_H
-#define _CPUFREQ_H 1
+#ifndef __CPUPOWER_CPUFREQ_H__
+#define __CPUPOWER_CPUFREQ_H__
 
 struct cpufreq_policy {
 	unsigned long min;
@@ -58,13 +58,6 @@ struct cpufreq_stats {
 extern "C" {
 #endif
 
-/*
- * returns 0 if the specified CPU is present (it doesn't say
- * whether it is online!), and an error value if not.
- */
-
-extern int cpufreq_cpu_exists(unsigned int cpu);
-
 /* determine current CPU frequency
  * - _kernel variant means kernel's opinion of CPU frequency
  * - _hardware variant means actual hardware CPU frequency,
@@ -73,9 +66,9 @@ extern int cpufreq_cpu_exists(unsigned int cpu);
  * returns 0 on failure, else frequency in kHz.
  */
 
-extern unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
+unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
 
-extern unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
+unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
 
 #define cpufreq_get(cpu) cpufreq_get_freq_kernel(cpu);
 
@@ -84,7 +77,7 @@ extern unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
  *
  * returns 0 on failure, else transition latency in 10^(-9) s = nanoseconds
  */
-extern unsigned long cpufreq_get_transition_latency(unsigned int cpu);
+unsigned long cpufreq_get_transition_latency(unsigned int cpu);
 
 
 /* determine hardware CPU frequency limits
@@ -93,7 +86,7 @@ extern unsigned long cpufreq_get_transition_latency(unsigned int cpu);
  * considerations by cpufreq policy notifiers in the kernel.
  */
 
-extern int cpufreq_get_hardware_limits(unsigned int cpu,
+int cpufreq_get_hardware_limits(unsigned int cpu,
 				unsigned long *min,
 				unsigned long *max);
 
@@ -104,9 +97,9 @@ extern int cpufreq_get_hardware_limits(unsigned int cpu,
  * to avoid memory leakage, please.
  */
 
-extern char *cpufreq_get_driver(unsigned int cpu);
+char *cpufreq_get_driver(unsigned int cpu);
 
-extern void cpufreq_put_driver(char *ptr);
+void cpufreq_put_driver(char *ptr);
 
 
 /* determine CPUfreq policy currently used
@@ -116,9 +109,9 @@ extern void cpufreq_put_driver(char *ptr);
  */
 
 
-extern struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu);
+struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu);
 
-extern void cpufreq_put_policy(struct cpufreq_policy *policy);
+void cpufreq_put_policy(struct cpufreq_policy *policy);
 
 
 /* determine CPUfreq governors currently available
@@ -129,10 +122,10 @@ extern void cpufreq_put_policy(struct cpufreq_policy *policy);
  */
 
 
-extern struct cpufreq_available_governors
+struct cpufreq_available_governors
 *cpufreq_get_available_governors(unsigned int cpu);
 
-extern void cpufreq_put_available_governors(
+void cpufreq_put_available_governors(
 	struct cpufreq_available_governors *first);
 
 
@@ -143,10 +136,10 @@ extern void cpufreq_put_available_governors(
  * cpufreq_put_available_frequencies after use.
  */
 
-extern struct cpufreq_available_frequencies
+struct cpufreq_available_frequencies
 *cpufreq_get_available_frequencies(unsigned int cpu);
 
-extern void cpufreq_put_available_frequencies(
+void cpufreq_put_available_frequencies(
 		struct cpufreq_available_frequencies *first);
 
 
@@ -156,10 +149,10 @@ extern void cpufreq_put_available_frequencies(
  * to avoid memory leakage, please.
  */
 
-extern struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned
+struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned
 							int cpu);
 
-extern void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *first);
+void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *first);
 
 
 /* determine related CPUs
@@ -168,10 +161,10 @@ extern void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *first);
  * to avoid memory leakage, please.
  */
 
-extern struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned
+struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned
 							int cpu);
 
-extern void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *first);
+void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *first);
 
 
 /* determine stats for cpufreq subsystem
@@ -179,12 +172,12 @@ extern void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *first);
  * This is not available in all kernel versions or configurations.
  */
 
-extern struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
+struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
 					unsigned long long *total_time);
 
-extern void cpufreq_put_stats(struct cpufreq_stats *stats);
+void cpufreq_put_stats(struct cpufreq_stats *stats);
 
-extern unsigned long cpufreq_get_transitions(unsigned int cpu);
+unsigned long cpufreq_get_transitions(unsigned int cpu);
 
 
 /* set new cpufreq policy
@@ -193,7 +186,7 @@ extern unsigned long cpufreq_get_transitions(unsigned int cpu);
  * but results may differ depending e.g. on governors being available.
  */
 
-extern int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy);
+int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy);
 
 
 /* modify a policy by only changing min/max freq or governor
@@ -201,9 +194,9 @@ extern int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy);
  * Does not check whether result is what was intended.
  */
 
-extern int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
-extern int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
-extern int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
+int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
+int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
+int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
 
 
 /* set a specific frequency
@@ -213,7 +206,7 @@ extern int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
  * occurs. Also does not work on ->range() cpufreq drivers.
  */
 
-extern int cpufreq_set_frequency(unsigned int cpu,
+int cpufreq_set_frequency(unsigned int cpu,
 				unsigned long target_frequency);
 
 #ifdef __cplusplus
diff --git a/lib/cpuidle.c b/lib/cpuidle.c
new file mode 100644
index 0000000..5b1928a
--- /dev/null
+++ b/lib/cpuidle.c
@@ -0,0 +1,380 @@
+/*
+ *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
+ *  (C) 2011       Thomas Renninger <trenn@novell.com> Novell Inc.
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "cpuidle.h"
+#include "cpupower_intern.h"
+
+/*
+ * helper function to check whether a file under "../cpuX/cpuidle/stateX/" dir
+ * exists.
+ * For example the functionality to disable c-states was introduced in later
+ * kernel versions, this function can be used to explicitly check for this
+ * feature.
+ *
+ * returns 1 if the file exists, 0 otherwise.
+ */
+static
+unsigned int cpuidle_state_file_exists(unsigned int cpu,
+				       unsigned int idlestate,
+				       const char *fname)
+{
+	char path[SYSFS_PATH_MAX];
+	struct stat statbuf;
+
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+		 cpu, idlestate, fname);
+	if (stat(path, &statbuf) != 0)
+		return 0;
+	return 1;
+}
+
+/*
+ * helper function to read file from /sys into given buffer
+ * fname is a relative path under "cpuX/cpuidle/stateX/" dir
+ * cstates starting with 0, C0 is not counted as cstate.
+ * This means if you want C1 info, pass 0 as idlestate param
+ */
+static
+unsigned int cpuidle_state_read_file(unsigned int cpu,
+					    unsigned int idlestate,
+					    const char *fname, char *buf,
+					    size_t buflen)
+{
+	char path[SYSFS_PATH_MAX];
+	int fd;
+	ssize_t numread;
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+		 cpu, idlestate, fname);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return 0;
+
+	numread = read(fd, buf, buflen - 1);
+	if (numread < 1) {
+		close(fd);
+		return 0;
+	}
+
+	buf[numread] = '\0';
+	close(fd);
+
+	return (unsigned int) numread;
+}
+
+/* 
+ * helper function to write a new value to a /sys file
+ * fname is a relative path under "../cpuX/cpuidle/cstateY/" dir
+ *
+ * Returns the number of bytes written or 0 on error
+ */
+static
+unsigned int cpuidle_state_write_file(unsigned int cpu,
+				      unsigned int idlestate,
+				      const char *fname,
+				      const char *value, size_t len)
+{
+	char path[SYSFS_PATH_MAX];
+	int fd;
+	ssize_t numwrite;
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+		 cpu, idlestate, fname);
+
+	fd = open(path, O_WRONLY);
+	if (fd == -1)
+		return 0;
+
+	numwrite = write(fd, value, len);
+	if (numwrite < 1) {
+		close(fd);
+		return 0;
+	}
+
+	close(fd);
+
+	return (unsigned int) numwrite;
+}
+
+/* read access to files which contain one numeric value */
+
+enum idlestate_value {
+	IDLESTATE_USAGE,
+	IDLESTATE_POWER,
+	IDLESTATE_LATENCY,
+	IDLESTATE_TIME,
+	IDLESTATE_DISABLE,
+	MAX_IDLESTATE_VALUE_FILES
+};
+
+static const char *idlestate_value_files[MAX_IDLESTATE_VALUE_FILES] = {
+	[IDLESTATE_USAGE] = "usage",
+	[IDLESTATE_POWER] = "power",
+	[IDLESTATE_LATENCY] = "latency",
+	[IDLESTATE_TIME]  = "time",
+	[IDLESTATE_DISABLE]  = "disable",
+};
+
+static
+unsigned long long cpuidle_state_get_one_value(unsigned int cpu,
+					       unsigned int idlestate,
+					       enum idlestate_value which)
+{
+	unsigned long long value;
+	unsigned int len;
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+
+	if (which >= MAX_IDLESTATE_VALUE_FILES)
+		return 0;
+
+	len = cpuidle_state_read_file(cpu, idlestate,
+				      idlestate_value_files[which],
+				      linebuf, sizeof(linebuf));
+	if (len == 0)
+		return 0;
+
+	value = strtoull(linebuf, &endp, 0);
+
+	if (endp == linebuf || errno == ERANGE)
+		return 0;
+
+	return value;
+}
+
+/* read access to files which contain one string */
+
+enum idlestate_string {
+	IDLESTATE_DESC,
+	IDLESTATE_NAME,
+	MAX_IDLESTATE_STRING_FILES
+};
+
+static const char *idlestate_string_files[MAX_IDLESTATE_STRING_FILES] = {
+	[IDLESTATE_DESC] = "desc",
+	[IDLESTATE_NAME] = "name",
+};
+
+
+static char *cpuidle_state_get_one_string(unsigned int cpu,
+					unsigned int idlestate,
+					enum idlestate_string which)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *result;
+	unsigned int len;
+
+	if (which >= MAX_IDLESTATE_STRING_FILES)
+		return NULL;
+
+	len = cpuidle_state_read_file(cpu, idlestate,
+				      idlestate_string_files[which],
+				      linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	result = strdup(linebuf);
+	if (result == NULL)
+		return NULL;
+
+	if (result[strlen(result) - 1] == '\n')
+		result[strlen(result) - 1] = '\0';
+
+	return result;
+}
+
+/*
+ * Returns:
+ *    1  if disabled
+ *    0  if enabled
+ *    -1 if idlestate is not available
+ *    -2 if disabling is not supported by the kernel
+ */
+int cpuidle_is_state_disabled(unsigned int cpu,
+				unsigned int idlestate)
+{
+	if (cpuidle_state_count(cpu) <= idlestate)
+		return -1;
+
+	if (!cpuidle_state_file_exists(cpu, idlestate,
+				 idlestate_value_files[IDLESTATE_DISABLE]))
+		return -2;
+	return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_DISABLE);
+}
+
+/*
+ * Pass 1 as last argument to disable or 0 to enable the state
+ * Returns:
+ *    0  on success
+ *    negative values on error, for example:
+ *      -1 if idlestate is not available
+ *      -2 if disabling is not supported by the kernel
+ *      -3 No write access to disable/enable C-states
+ */
+int cpuidle_state_disable(unsigned int cpu,
+			    unsigned int idlestate,
+			    unsigned int disable)
+{
+	char value[SYSFS_PATH_MAX];
+	int bytes_written;
+
+	if (cpuidle_state_count(cpu) <= idlestate)
+		return -1;
+
+	if (!cpuidle_state_file_exists(cpu, idlestate,
+				 idlestate_value_files[IDLESTATE_DISABLE]))
+		return -2;
+
+	snprintf(value, SYSFS_PATH_MAX, "%u", disable);
+
+	bytes_written = cpuidle_state_write_file(cpu, idlestate, "disable",
+						   value, sizeof(disable));
+	if (bytes_written)
+		return 0;
+	return -3;
+}
+
+unsigned long cpuidle_state_latency(unsigned int cpu,
+					  unsigned int idlestate)
+{
+	return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_LATENCY);
+}
+
+unsigned long cpuidle_state_usage(unsigned int cpu,
+					unsigned int idlestate)
+{
+	return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_USAGE);
+}
+
+unsigned long long cpuidle_state_time(unsigned int cpu,
+					unsigned int idlestate)
+{
+	return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_TIME);
+}
+
+char *cpuidle_state_name(unsigned int cpu, unsigned int idlestate)
+{
+	return cpuidle_state_get_one_string(cpu, idlestate, IDLESTATE_NAME);
+}
+
+char *cpuidle_state_desc(unsigned int cpu, unsigned int idlestate)
+{
+	return cpuidle_state_get_one_string(cpu, idlestate, IDLESTATE_DESC);
+}
+
+/*
+ * Returns number of supported C-states of CPU core cpu
+ * Negativ in error case
+ * Zero if cpuidle does not export any C-states
+ */
+unsigned int cpuidle_state_count(unsigned int cpu)
+{
+	char file[SYSFS_PATH_MAX];
+	struct stat statbuf;
+	int idlestates = 1;
+
+
+	snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpuidle");
+	if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+		return 0;
+
+	snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpu%u/cpuidle/state0", cpu);
+	if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+		return 0;
+
+	while (stat(file, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
+		snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU
+			 "cpu%u/cpuidle/state%d", cpu, idlestates);
+		idlestates++;
+	}
+	idlestates--;
+	return idlestates;
+}
+
+/* CPUidle general /sys/devices/system/cpu/cpuidle/ sysfs access ********/
+
+/*
+ * helper function to read file from /sys into given buffer
+ * fname is a relative path under "cpu/cpuidle/" dir
+ */
+static unsigned int sysfs_cpuidle_read_file(const char *fname, char *buf,
+					    size_t buflen)
+{
+	char path[SYSFS_PATH_MAX];
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpuidle/%s", fname);
+
+	return sysfs_read_file(path, buf, buflen);
+}
+
+
+
+/* read access to files which contain one string */
+
+enum cpuidle_string {
+	CPUIDLE_GOVERNOR,
+	CPUIDLE_GOVERNOR_RO,
+	CPUIDLE_DRIVER,
+	MAX_CPUIDLE_STRING_FILES
+};
+
+static const char *cpuidle_string_files[MAX_CPUIDLE_STRING_FILES] = {
+	[CPUIDLE_GOVERNOR]	= "current_governor",
+	[CPUIDLE_GOVERNOR_RO]	= "current_governor_ro",
+	[CPUIDLE_DRIVER]	= "current_driver",
+};
+
+
+static char *sysfs_cpuidle_get_one_string(enum cpuidle_string which)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *result;
+	unsigned int len;
+
+	if (which >= MAX_CPUIDLE_STRING_FILES)
+		return NULL;
+
+	len = sysfs_cpuidle_read_file(cpuidle_string_files[which],
+				linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	result = strdup(linebuf);
+	if (result == NULL)
+		return NULL;
+
+	if (result[strlen(result) - 1] == '\n')
+		result[strlen(result) - 1] = '\0';
+
+	return result;
+}
+
+char *cpuidle_get_governor(void)
+{
+	char *tmp = sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR_RO);
+	if (!tmp)
+		return sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR);
+	else
+		return tmp;
+}
+
+char *cpuidle_get_driver(void)
+{
+	return sysfs_cpuidle_get_one_string(CPUIDLE_DRIVER);
+}
+/* CPUidle idlestate specific /sys/devices/system/cpu/cpuX/cpuidle/ access */
diff --git a/lib/cpuidle.h b/lib/cpuidle.h
new file mode 100644
index 0000000..04eb3cf
--- /dev/null
+++ b/lib/cpuidle.h
@@ -0,0 +1,23 @@
+#ifndef __CPUPOWER_CPUIDLE_H__
+#define __CPUPOWER_CPUIDLE_H__
+
+int cpuidle_is_state_disabled(unsigned int cpu,
+				       unsigned int idlestate);
+int cpuidle_state_disable(unsigned int cpu, unsigned int idlestate,
+				   unsigned int disable);
+unsigned long cpuidle_state_latency(unsigned int cpu,
+						unsigned int idlestate);
+unsigned long cpuidle_state_usage(unsigned int cpu,
+					unsigned int idlestate);
+unsigned long long cpuidle_state_time(unsigned int cpu,
+						unsigned int idlestate);
+char *cpuidle_state_name(unsigned int cpu,
+				unsigned int idlestate);
+char *cpuidle_state_desc(unsigned int cpu,
+				unsigned int idlestate);
+unsigned int cpuidle_state_count(unsigned int cpu);
+
+char *cpuidle_get_governor(void);
+char *cpuidle_get_driver(void);
+
+#endif /* __CPUPOWER_HELPERS_SYSFS_H__ */
diff --git a/lib/cpupower.c b/lib/cpupower.c
new file mode 100644
index 0000000..9c395ec9
--- /dev/null
+++ b/lib/cpupower.c
@@ -0,0 +1,192 @@
+/*
+ *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include "cpupower.h"
+#include "cpupower_intern.h"
+
+unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen)
+{
+	int fd;
+	ssize_t numread;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return 0;
+
+	numread = read(fd, buf, buflen - 1);
+	if (numread < 1) {
+		close(fd);
+		return 0;
+	}
+
+	buf[numread] = '\0';
+	close(fd);
+
+	return (unsigned int) numread;
+}
+
+/*
+ * Detect whether a CPU is online
+ *
+ * Returns:
+ *     1 -> if CPU is online
+ *     0 -> if CPU is offline
+ *     negative errno values in error case
+ */
+int cpupower_is_cpu_online(unsigned int cpu)
+{
+	char path[SYSFS_PATH_MAX];
+	int fd;
+	ssize_t numread;
+	unsigned long long value;
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+	struct stat statbuf;
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u", cpu);
+
+	if (stat(path, &statbuf) != 0)
+		return 0;
+
+	/*
+	 * kernel without CONFIG_HOTPLUG_CPU
+	 * -> cpuX directory exists, but not cpuX/online file
+	 */
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/online", cpu);
+	if (stat(path, &statbuf) != 0)
+		return 1;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -errno;
+
+	numread = read(fd, linebuf, MAX_LINE_LEN - 1);
+	if (numread < 1) {
+		close(fd);
+		return -EIO;
+	}
+	linebuf[numread] = '\0';
+	close(fd);
+
+	value = strtoull(linebuf, &endp, 0);
+	if (value > 1)
+		return -EINVAL;
+
+	return value;
+}
+
+/* returns -1 on failure, 0 on success */
+static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *result)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+	char path[SYSFS_PATH_MAX];
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",
+			 cpu, fname);
+	if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
+		return -1;
+	*result = strtol(linebuf, &endp, 0);
+	if (endp == linebuf || errno == ERANGE)
+		return -1;
+	return 0;
+}
+
+static int __compare(const void *t1, const void *t2)
+{
+	struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1;
+	struct cpuid_core_info *top2 = (struct cpuid_core_info *)t2;
+	if (top1->pkg < top2->pkg)
+		return -1;
+	else if (top1->pkg > top2->pkg)
+		return 1;
+	else if (top1->core < top2->core)
+		return -1;
+	else if (top1->core > top2->core)
+		return 1;
+	else if (top1->cpu < top2->cpu)
+		return -1;
+	else if (top1->cpu > top2->cpu)
+		return 1;
+	else
+		return 0;
+}
+
+/*
+ * Returns amount of cpus, negative on error, cpu_top must be
+ * passed to cpu_topology_release to free resources
+ *
+ * Array is sorted after ->pkg, ->core, then ->cpu
+ */
+int get_cpu_topology(struct cpupower_topology *cpu_top)
+{
+	int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF);
+
+	cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus);
+	if (cpu_top->core_info == NULL)
+		return -ENOMEM;
+	cpu_top->pkgs = cpu_top->cores = 0;
+	for (cpu = 0; cpu < cpus; cpu++) {
+		cpu_top->core_info[cpu].cpu = cpu;
+		cpu_top->core_info[cpu].is_online = cpupower_is_cpu_online(cpu);
+		if(sysfs_topology_read_file(
+			cpu,
+			"physical_package_id",
+			&(cpu_top->core_info[cpu].pkg)) < 0) {
+			cpu_top->core_info[cpu].pkg = -1;
+			cpu_top->core_info[cpu].core = -1;
+			continue;
+		}
+		if(sysfs_topology_read_file(
+			cpu,
+			"core_id",
+			&(cpu_top->core_info[cpu].core)) < 0) {
+			cpu_top->core_info[cpu].pkg = -1;
+			cpu_top->core_info[cpu].core = -1;
+			continue;
+		}
+	}
+
+	qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info),
+	      __compare);
+
+	/* Count the number of distinct pkgs values. This works
+	   because the primary sort of the core_info struct was just
+	   done by pkg value. */
+	last_pkg = cpu_top->core_info[0].pkg;
+	for(cpu = 1; cpu < cpus; cpu++) {
+		if (cpu_top->core_info[cpu].pkg != last_pkg &&
+				cpu_top->core_info[cpu].pkg != -1) {
+
+			last_pkg = cpu_top->core_info[cpu].pkg;
+			cpu_top->pkgs++;
+		}
+	}
+	if (!(cpu_top->core_info[0].pkg == -1))
+		cpu_top->pkgs++;
+
+	/* Intel's cores count is not consecutively numbered, there may
+	 * be a core_id of 3, but none of 2. Assume there always is 0
+	 * Get amount of cores by counting duplicates in a package
+	for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) {
+		if (cpu_top->core_info[cpu].core == 0)
+	cpu_top->cores++;
+	*/
+	return cpus;
+}
+
+void cpu_topology_release(struct cpupower_topology cpu_top)
+{
+	free(cpu_top.core_info);
+}
diff --git a/lib/cpupower.h b/lib/cpupower.h
new file mode 100644
index 0000000..fa031fc
--- /dev/null
+++ b/lib/cpupower.h
@@ -0,0 +1,35 @@
+#ifndef __CPUPOWER_CPUPOWER_H__
+#define __CPUPOWER_CPUPOWER_H__
+
+struct cpupower_topology {
+	/* Amount of CPU cores, packages and threads per core in the system */
+	unsigned int cores;
+	unsigned int pkgs;
+	unsigned int threads; /* per core */
+
+	/* Array gets mallocated with cores entries, holding per core info */
+	struct cpuid_core_info *core_info;
+};
+
+struct cpuid_core_info {
+	int pkg;
+	int core;
+	int cpu;
+
+	/* flags */
+	unsigned int is_online:1;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int get_cpu_topology(struct cpupower_topology *cpu_top);
+void cpu_topology_release(struct cpupower_topology cpu_top);
+int cpupower_is_cpu_online(unsigned int cpu);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/cpupower_intern.h b/lib/cpupower_intern.h
new file mode 100644
index 0000000..f8ec400
--- /dev/null
+++ b/lib/cpupower_intern.h
@@ -0,0 +1,5 @@
+#define PATH_TO_CPU "/sys/devices/system/cpu/"
+#define MAX_LINE_LEN 4096
+#define SYSFS_PATH_MAX 255
+
+unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen);
diff --git a/lib/sysfs.c b/lib/sysfs.c
deleted file mode 100644
index 870713a..0000000
--- a/lib/sysfs.c
+++ /dev/null
@@ -1,672 +0,0 @@
-/*
- *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
- *
- *  Licensed under the terms of the GNU GPL License version 2.
- */
-
-#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"
-
-#define PATH_TO_CPU "/sys/devices/system/cpu/"
-#define MAX_LINE_LEN 4096
-#define SYSFS_PATH_MAX 255
-
-
-static unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen)
-{
-	int fd;
-	ssize_t numread;
-
-	fd = open(path, O_RDONLY);
-	if (fd == -1)
-		return 0;
-
-	numread = read(fd, buf, buflen - 1);
-	if (numread < 1) {
-		close(fd);
-		return 0;
-	}
-
-	buf[numread] = '\0';
-	close(fd);
-
-	return (unsigned int) numread;
-}
-
-
-/* CPUFREQ sysfs access **************************************************/
-
-/* helper function to read file from /sys into given buffer */
-/* fname is a relative path under "cpuX/cpufreq" dir */
-static unsigned int sysfs_cpufreq_read_file(unsigned int cpu, const char *fname,
-					    char *buf, size_t buflen)
-{
-	char path[SYSFS_PATH_MAX];
-
-	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
-			 cpu, fname);
-	return sysfs_read_file(path, buf, buflen);
-}
-
-/* helper function to write a new value to a /sys file */
-/* fname is a relative path under "cpuX/cpufreq" dir */
-static unsigned int sysfs_cpufreq_write_file(unsigned int cpu,
-					     const char *fname,
-					     const char *value, size_t len)
-{
-	char path[SYSFS_PATH_MAX];
-	int fd;
-	ssize_t numwrite;
-
-	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
-			 cpu, fname);
-
-	fd = open(path, O_WRONLY);
-	if (fd == -1)
-		return 0;
-
-	numwrite = write(fd, value, len);
-	if (numwrite < 1) {
-		close(fd);
-		return 0;
-	}
-
-	close(fd);
-
-	return (unsigned int) numwrite;
-}
-
-/* read access to files which contain one numeric value */
-
-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
-};
-
-static const char *cpufreq_value_files[MAX_CPUFREQ_VALUE_READ_FILES] = {
-	[CPUINFO_CUR_FREQ] = "cpuinfo_cur_freq",
-	[CPUINFO_MIN_FREQ] = "cpuinfo_min_freq",
-	[CPUINFO_MAX_FREQ] = "cpuinfo_max_freq",
-	[CPUINFO_LATENCY]  = "cpuinfo_transition_latency",
-	[SCALING_CUR_FREQ] = "scaling_cur_freq",
-	[SCALING_MIN_FREQ] = "scaling_min_freq",
-	[SCALING_MAX_FREQ] = "scaling_max_freq",
-	[STATS_NUM_TRANSITIONS] = "stats/total_trans"
-};
-
-
-static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
-						 enum cpufreq_value which)
-{
-	unsigned long value;
-	unsigned int len;
-	char linebuf[MAX_LINE_LEN];
-	char *endp;
-
-	if (which >= MAX_CPUFREQ_VALUE_READ_FILES)
-		return 0;
-
-	len = sysfs_cpufreq_read_file(cpu, cpufreq_value_files[which],
-				linebuf, sizeof(linebuf));
-
-	if (len == 0)
-		return 0;
-
-	value = strtoul(linebuf, &endp, 0);
-
-	if (endp == linebuf || errno == ERANGE)
-		return 0;
-
-	return value;
-}
-
-/* read access to files which contain one string */
-
-enum cpufreq_string {
-	SCALING_DRIVER,
-	SCALING_GOVERNOR,
-	MAX_CPUFREQ_STRING_FILES
-};
-
-static const char *cpufreq_string_files[MAX_CPUFREQ_STRING_FILES] = {
-	[SCALING_DRIVER] = "scaling_driver",
-	[SCALING_GOVERNOR] = "scaling_governor",
-};
-
-
-static char *sysfs_cpufreq_get_one_string(unsigned int cpu,
-					   enum cpufreq_string which)
-{
-	char linebuf[MAX_LINE_LEN];
-	char *result;
-	unsigned int len;
-
-	if (which >= MAX_CPUFREQ_STRING_FILES)
-		return NULL;
-
-	len = sysfs_cpufreq_read_file(cpu, cpufreq_string_files[which],
-				linebuf, sizeof(linebuf));
-	if (len == 0)
-		return NULL;
-
-	result = strdup(linebuf);
-	if (result == NULL)
-		return NULL;
-
-	if (result[strlen(result) - 1] == '\n')
-		result[strlen(result) - 1] = '\0';
-
-	return result;
-}
-
-/* write access */
-
-enum cpufreq_write {
-	WRITE_SCALING_MIN_FREQ,
-	WRITE_SCALING_MAX_FREQ,
-	WRITE_SCALING_GOVERNOR,
-	WRITE_SCALING_SET_SPEED,
-	MAX_CPUFREQ_WRITE_FILES
-};
-
-static const char *cpufreq_write_files[MAX_CPUFREQ_WRITE_FILES] = {
-	[WRITE_SCALING_MIN_FREQ] = "scaling_min_freq",
-	[WRITE_SCALING_MAX_FREQ] = "scaling_max_freq",
-	[WRITE_SCALING_GOVERNOR] = "scaling_governor",
-	[WRITE_SCALING_SET_SPEED] = "scaling_setspeed",
-};
-
-static int sysfs_cpufreq_write_one_value(unsigned int cpu,
-					 enum cpufreq_write which,
-					 const char *new_value, size_t len)
-{
-	if (which >= MAX_CPUFREQ_WRITE_FILES)
-		return 0;
-
-	if (sysfs_cpufreq_write_file(cpu, cpufreq_write_files[which],
-					new_value, len) != len)
-		return -ENODEV;
-
-	return 0;
-};
-
-unsigned long sysfs_get_freq_kernel(unsigned int cpu)
-{
-	return sysfs_cpufreq_get_one_value(cpu, SCALING_CUR_FREQ);
-}
-
-unsigned long sysfs_get_freq_hardware(unsigned int cpu)
-{
-	return sysfs_cpufreq_get_one_value(cpu, CPUINFO_CUR_FREQ);
-}
-
-unsigned long sysfs_get_freq_transition_latency(unsigned int cpu)
-{
-	return sysfs_cpufreq_get_one_value(cpu, CPUINFO_LATENCY);
-}
-
-int sysfs_get_freq_hardware_limits(unsigned int cpu,
-			      unsigned long *min,
-			      unsigned long *max)
-{
-	if ((!min) || (!max))
-		return -EINVAL;
-
-	*min = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MIN_FREQ);
-	if (!*min)
-		return -ENODEV;
-
-	*max = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MAX_FREQ);
-	if (!*max)
-		return -ENODEV;
-
-	return 0;
-}
-
-char *sysfs_get_freq_driver(unsigned int cpu)
-{
-	return sysfs_cpufreq_get_one_string(cpu, SCALING_DRIVER);
-}
-
-struct cpufreq_policy *sysfs_get_freq_policy(unsigned int cpu)
-{
-	struct cpufreq_policy *policy;
-
-	policy = malloc(sizeof(struct cpufreq_policy));
-	if (!policy)
-		return NULL;
-
-	policy->governor = sysfs_cpufreq_get_one_string(cpu, SCALING_GOVERNOR);
-	if (!policy->governor) {
-		free(policy);
-		return NULL;
-	}
-	policy->min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);
-	policy->max = sysfs_cpufreq_get_one_value(cpu, SCALING_MAX_FREQ);
-	if ((!policy->min) || (!policy->max)) {
-		free(policy->governor);
-		free(policy);
-		return NULL;
-	}
-
-	return policy;
-}
-
-struct cpufreq_available_governors *
-sysfs_get_freq_available_governors(unsigned int cpu) {
-	struct cpufreq_available_governors *first = NULL;
-	struct cpufreq_available_governors *current = NULL;
-	char linebuf[MAX_LINE_LEN];
-	unsigned int pos, i;
-	unsigned int len;
-
-	len = sysfs_cpufreq_read_file(cpu, "scaling_available_governors",
-				linebuf, sizeof(linebuf));
-	if (len == 0)
-		return NULL;
-
-	pos = 0;
-	for (i = 0; i < len; i++) {
-		if (linebuf[i] == ' ' || linebuf[i] == '\n') {
-			if (i - pos < 2)
-				continue;
-			if (current) {
-				current->next = malloc(sizeof(*current));
-				if (!current->next)
-					goto error_out;
-				current = current->next;
-			} else {
-				first = malloc(sizeof(*first));
-				if (!first)
-					goto error_out;
-				current = first;
-			}
-			current->first = first;
-			current->next = NULL;
-
-			current->governor = malloc(i - pos + 1);
-			if (!current->governor)
-				goto error_out;
-
-			memcpy(current->governor, linebuf + pos, i - pos);
-			current->governor[i - pos] = '\0';
-			pos = i + 1;
-		}
-	}
-
-	return first;
-
- error_out:
-	while (first) {
-		current = first->next;
-		if (first->governor)
-			free(first->governor);
-		free(first);
-		first = current;
-	}
-	return NULL;
-}
-
-
-struct cpufreq_available_frequencies *
-sysfs_get_available_frequencies(unsigned int cpu) {
-	struct cpufreq_available_frequencies *first = NULL;
-	struct cpufreq_available_frequencies *current = NULL;
-	char one_value[SYSFS_PATH_MAX];
-	char linebuf[MAX_LINE_LEN];
-	unsigned int pos, i;
-	unsigned int len;
-
-	len = sysfs_cpufreq_read_file(cpu, "scaling_available_frequencies",
-				linebuf, sizeof(linebuf));
-	if (len == 0)
-		return NULL;
-
-	pos = 0;
-	for (i = 0; i < len; i++) {
-		if (linebuf[i] == ' ' || linebuf[i] == '\n') {
-			if (i - pos < 2)
-				continue;
-			if (i - pos >= SYSFS_PATH_MAX)
-				goto error_out;
-			if (current) {
-				current->next = malloc(sizeof(*current));
-				if (!current->next)
-					goto error_out;
-				current = current->next;
-			} else {
-				first = malloc(sizeof(*first));
-				if (!first)
-					goto error_out;
-				current = first;
-			}
-			current->first = first;
-			current->next = NULL;
-
-			memcpy(one_value, linebuf + pos, i - pos);
-			one_value[i - pos] = '\0';
-			if (sscanf(one_value, "%lu", &current->frequency) != 1)
-				goto error_out;
-
-			pos = i + 1;
-		}
-	}
-
-	return first;
-
- error_out:
-	while (first) {
-		current = first->next;
-		free(first);
-		first = current;
-	}
-	return NULL;
-}
-
-static struct cpufreq_affected_cpus *sysfs_get_cpu_list(unsigned int cpu,
-							const char *file)
-{
-	struct cpufreq_affected_cpus *first = NULL;
-	struct cpufreq_affected_cpus *current = NULL;
-	char one_value[SYSFS_PATH_MAX];
-	char linebuf[MAX_LINE_LEN];
-	unsigned int pos, i;
-	unsigned int len;
-
-	len = sysfs_cpufreq_read_file(cpu, file, linebuf, sizeof(linebuf));
-	if (len == 0)
-		return NULL;
-
-	pos = 0;
-	for (i = 0; i < len; i++) {
-		if (i == len || linebuf[i] == ' ' || linebuf[i] == '\n') {
-			if (i - pos  < 1)
-				continue;
-			if (i - pos >= SYSFS_PATH_MAX)
-				goto error_out;
-			if (current) {
-				current->next = malloc(sizeof(*current));
-				if (!current->next)
-					goto error_out;
-				current = current->next;
-			} else {
-				first = malloc(sizeof(*first));
-				if (!first)
-					goto error_out;
-				current = first;
-			}
-			current->first = first;
-			current->next = NULL;
-
-			memcpy(one_value, linebuf + pos, i - pos);
-			one_value[i - pos] = '\0';
-
-			if (sscanf(one_value, "%u", &current->cpu) != 1)
-				goto error_out;
-
-			pos = i + 1;
-		}
-	}
-
-	return first;
-
- error_out:
-	while (first) {
-		current = first->next;
-		free(first);
-		first = current;
-	}
-	return NULL;
-}
-
-struct cpufreq_affected_cpus *sysfs_get_freq_affected_cpus(unsigned int cpu)
-{
-	return sysfs_get_cpu_list(cpu, "affected_cpus");
-}
-
-struct cpufreq_affected_cpus *sysfs_get_freq_related_cpus(unsigned int cpu)
-{
-	return sysfs_get_cpu_list(cpu, "related_cpus");
-}
-
-struct cpufreq_stats *sysfs_get_freq_stats(unsigned int cpu,
-					unsigned long long *total_time) {
-	struct cpufreq_stats *first = NULL;
-	struct cpufreq_stats *current = NULL;
-	char one_value[SYSFS_PATH_MAX];
-	char linebuf[MAX_LINE_LEN];
-	unsigned int pos, i;
-	unsigned int len;
-
-	len = sysfs_cpufreq_read_file(cpu, "stats/time_in_state",
-				linebuf, sizeof(linebuf));
-	if (len == 0)
-		return NULL;
-
-	*total_time = 0;
-	pos = 0;
-	for (i = 0; i < len; i++) {
-		if (i == strlen(linebuf) || linebuf[i] == '\n')	{
-			if (i - pos < 2)
-				continue;
-			if ((i - pos) >= SYSFS_PATH_MAX)
-				goto error_out;
-			if (current) {
-				current->next = malloc(sizeof(*current));
-				if (!current->next)
-					goto error_out;
-				current = current->next;
-			} else {
-				first = malloc(sizeof(*first));
-				if (!first)
-					goto error_out;
-				current = first;
-			}
-			current->first = first;
-			current->next = NULL;
-
-			memcpy(one_value, linebuf + pos, i - pos);
-			one_value[i - pos] = '\0';
-			if (sscanf(one_value, "%lu %llu",
-					&current->frequency,
-					&current->time_in_state) != 2)
-				goto error_out;
-
-			*total_time = *total_time + current->time_in_state;
-			pos = i + 1;
-		}
-	}
-
-	return first;
-
- error_out:
-	while (first) {
-		current = first->next;
-		free(first);
-		first = current;
-	}
-	return NULL;
-}
-
-unsigned long sysfs_get_freq_transitions(unsigned int cpu)
-{
-	return sysfs_cpufreq_get_one_value(cpu, STATS_NUM_TRANSITIONS);
-}
-
-static int verify_gov(char *new_gov, char *passed_gov)
-{
-	unsigned int i, j = 0;
-
-	if (!passed_gov || (strlen(passed_gov) > 19))
-		return -EINVAL;
-
-	strncpy(new_gov, passed_gov, 20);
-	for (i = 0; i < 20; i++) {
-		if (j) {
-			new_gov[i] = '\0';
-			continue;
-		}
-		if ((new_gov[i] >= 'a') && (new_gov[i] <= 'z'))
-			continue;
-
-		if ((new_gov[i] >= 'A') && (new_gov[i] <= 'Z'))
-			continue;
-
-		if (new_gov[i] == '-')
-			continue;
-
-		if (new_gov[i] == '_')
-			continue;
-
-		if (new_gov[i] == '\0') {
-			j = 1;
-			continue;
-		}
-		return -EINVAL;
-	}
-	new_gov[19] = '\0';
-	return 0;
-}
-
-int sysfs_modify_freq_policy_governor(unsigned int cpu, char *governor)
-{
-	char new_gov[SYSFS_PATH_MAX];
-
-	if (!governor)
-		return -EINVAL;
-
-	if (verify_gov(new_gov, governor))
-		return -EINVAL;
-
-	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR,
-					     new_gov, strlen(new_gov));
-};
-
-int sysfs_modify_freq_policy_max(unsigned int cpu, unsigned long max_freq)
-{
-	char value[SYSFS_PATH_MAX];
-
-	snprintf(value, SYSFS_PATH_MAX, "%lu", max_freq);
-
-	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
-					     value, strlen(value));
-};
-
-
-int sysfs_modify_freq_policy_min(unsigned int cpu, unsigned long min_freq)
-{
-	char value[SYSFS_PATH_MAX];
-
-	snprintf(value, SYSFS_PATH_MAX, "%lu", min_freq);
-
-	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ,
-					     value, strlen(value));
-};
-
-
-int sysfs_set_freq_policy(unsigned int cpu, struct cpufreq_policy *policy)
-{
-	char min[SYSFS_PATH_MAX];
-	char max[SYSFS_PATH_MAX];
-	char gov[SYSFS_PATH_MAX];
-	int ret;
-	unsigned long old_min;
-	int write_max_first;
-
-	if (!policy || !(policy->governor))
-		return -EINVAL;
-
-	if (policy->max < policy->min)
-		return -EINVAL;
-
-	if (verify_gov(gov, policy->governor))
-		return -EINVAL;
-
-	snprintf(min, SYSFS_PATH_MAX, "%lu", policy->min);
-	snprintf(max, SYSFS_PATH_MAX, "%lu", policy->max);
-
-	old_min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);
-	write_max_first = (old_min && (policy->max < old_min) ? 0 : 1);
-
-	if (write_max_first) {
-		ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
-						    max, strlen(max));
-		if (ret)
-			return ret;
-	}
-
-	ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ, min,
-					    strlen(min));
-	if (ret)
-		return ret;
-
-	if (!write_max_first) {
-		ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
-						    max, strlen(max));
-		if (ret)
-			return ret;
-	}
-
-	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR,
-					     gov, strlen(gov));
-}
-
-int sysfs_set_frequency(unsigned int cpu, unsigned long target_frequency)
-{
-	struct cpufreq_policy *pol = sysfs_get_freq_policy(cpu);
-	char userspace_gov[] = "userspace";
-	char freq[SYSFS_PATH_MAX];
-	int ret;
-
-	if (!pol)
-		return -ENODEV;
-
-	if (strncmp(pol->governor, userspace_gov, 9) != 0) {
-		ret = sysfs_modify_freq_policy_governor(cpu, userspace_gov);
-		if (ret) {
-			cpufreq_put_policy(pol);
-			return ret;
-		}
-	}
-
-	cpufreq_put_policy(pol);
-
-	snprintf(freq, SYSFS_PATH_MAX, "%lu", target_frequency);
-
-	return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_SET_SPEED,
-					     freq, strlen(freq));
-}
-
-/* CPUFREQ sysfs access **************************************************/
-
-/* General sysfs access **************************************************/
-int sysfs_cpu_exists(unsigned int cpu)
-{
-	char file[SYSFS_PATH_MAX];
-	struct stat statbuf;
-
-	snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpu%u/", cpu);
-
-	if (stat(file, &statbuf) != 0)
-		return -ENOSYS;
-
-	return S_ISDIR(statbuf.st_mode) ? 0 : -ENOSYS;
-}
-
-/* General sysfs access **************************************************/
diff --git a/lib/sysfs.h b/lib/sysfs.h
deleted file mode 100644
index c76a5e0..0000000
--- a/lib/sysfs.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/* General */
-extern unsigned int sysfs_cpu_exists(unsigned int cpu);
-
-/* CPUfreq */
-extern unsigned long sysfs_get_freq_kernel(unsigned int cpu);
-extern unsigned long sysfs_get_freq_hardware(unsigned int cpu);
-extern unsigned long sysfs_get_freq_transition_latency(unsigned int cpu);
-extern int sysfs_get_freq_hardware_limits(unsigned int cpu,
-					unsigned long *min, unsigned long *max);
-extern char *sysfs_get_freq_driver(unsigned int cpu);
-extern struct cpufreq_policy *sysfs_get_freq_policy(unsigned int cpu);
-extern struct cpufreq_available_governors *sysfs_get_freq_available_governors(
-	unsigned int cpu);
-extern struct cpufreq_available_frequencies *sysfs_get_available_frequencies(
-	unsigned int cpu);
-extern struct cpufreq_affected_cpus *sysfs_get_freq_affected_cpus(
-	unsigned int cpu);
-extern struct cpufreq_affected_cpus *sysfs_get_freq_related_cpus(
-	unsigned int cpu);
-extern struct cpufreq_stats *sysfs_get_freq_stats(unsigned int cpu,
-						unsigned long long *total_time);
-extern unsigned long sysfs_get_freq_transitions(unsigned int cpu);
-extern int sysfs_set_freq_policy(unsigned int cpu,
-				struct cpufreq_policy *policy);
-extern int sysfs_modify_freq_policy_min(unsigned int cpu,
-					unsigned long min_freq);
-extern int sysfs_modify_freq_policy_max(unsigned int cpu,
-					unsigned long max_freq);
-extern int sysfs_modify_freq_policy_governor(unsigned int cpu, char *governor);
-extern int sysfs_set_frequency(unsigned int cpu,
-			unsigned long target_frequency);
diff --git a/utils/cpufreq-set.c b/utils/cpufreq-set.c
index 0fbd1a2..b4bf769 100644
--- a/utils/cpufreq-set.c
+++ b/utils/cpufreq-set.c
@@ -16,8 +16,8 @@
 #include <getopt.h>
 
 #include "cpufreq.h"
+#include "cpuidle.h"
 #include "helpers/helpers.h"
-#include "helpers/sysfs.h"
 
 #define NORM_FREQ_LEN 32
 
@@ -296,7 +296,7 @@ int cmd_freq_set(int argc, char **argv)
 			struct cpufreq_affected_cpus *cpus;
 
 			if (!bitmask_isbitset(cpus_chosen, cpu) ||
-			    cpufreq_cpu_exists(cpu))
+			    cpupower_is_cpu_online(cpu))
 				continue;
 
 			cpus = cpufreq_get_related_cpus(cpu);
@@ -316,10 +316,10 @@ int cmd_freq_set(int argc, char **argv)
 	     cpu <= bitmask_last(cpus_chosen); cpu++) {
 
 		if (!bitmask_isbitset(cpus_chosen, cpu) ||
-		    cpufreq_cpu_exists(cpu))
+		    cpupower_is_cpu_online(cpu))
 			continue;
 
-		if (sysfs_is_cpu_online(cpu) != 1)
+		if (cpupower_is_cpu_online(cpu) != 1)
 			continue;
 
 		printf(_("Setting cpu: %d\n"), cpu);
diff --git a/utils/cpuidle-info.c b/utils/cpuidle-info.c
index 8bf8ab5..b59c85d 100644
--- a/utils/cpuidle-info.c
+++ b/utils/cpuidle-info.c
@@ -13,8 +13,10 @@
 #include <string.h>
 #include <getopt.h>
 
-#include "helpers/helpers.h"
+#include <cpuidle.h>
+
 #include "helpers/sysfs.h"
+#include "helpers/helpers.h"
 #include "helpers/bitmask.h"
 
 #define LINE_LEN 10
@@ -24,7 +26,7 @@ static void cpuidle_cpu_output(unsigned int cpu, int verbose)
 	unsigned int idlestates, idlestate;
 	char *tmp;
 
-	idlestates = sysfs_get_idlestate_count(cpu);
+	idlestates = cpuidle_state_count(cpu);
 	if (idlestates == 0) {
 		printf(_("CPU %u: No idle states\n"), cpu);
 		return;
@@ -33,7 +35,7 @@ static void cpuidle_cpu_output(unsigned int cpu, int verbose)
 	printf(_("Number of idle states: %d\n"), idlestates);
 	printf(_("Available idle states:"));
 	for (idlestate = 0; idlestate < idlestates; idlestate++) {
-		tmp = sysfs_get_idlestate_name(cpu, idlestate);
+		tmp = cpuidle_state_name(cpu, idlestate);
 		if (!tmp)
 			continue;
 		printf(" %s", tmp);
@@ -45,28 +47,28 @@ static void cpuidle_cpu_output(unsigned int cpu, int verbose)
 		return;
 
 	for (idlestate = 0; idlestate < idlestates; idlestate++) {
-		int disabled = sysfs_is_idlestate_disabled(cpu, idlestate);
+		int disabled = cpuidle_is_state_disabled(cpu, idlestate);
 		/* Disabled interface not supported on older kernels */
 		if (disabled < 0)
 			disabled = 0;
-		tmp = sysfs_get_idlestate_name(cpu, idlestate);
+		tmp = cpuidle_state_name(cpu, idlestate);
 		if (!tmp)
 			continue;
 		printf("%s%s:\n", tmp, (disabled) ? " (DISABLED) " : "");
 		free(tmp);
 
-		tmp = sysfs_get_idlestate_desc(cpu, idlestate);
+		tmp = cpuidle_state_desc(cpu, idlestate);
 		if (!tmp)
 			continue;
 		printf(_("Flags/Description: %s\n"), tmp);
 		free(tmp);
 
 		printf(_("Latency: %lu\n"),
-		       sysfs_get_idlestate_latency(cpu, idlestate));
+		       cpuidle_state_latency(cpu, idlestate));
 		printf(_("Usage: %lu\n"),
-		       sysfs_get_idlestate_usage(cpu, idlestate));
+		       cpuidle_state_usage(cpu, idlestate));
 		printf(_("Duration: %llu\n"),
-		       sysfs_get_idlestate_time(cpu, idlestate));
+		       cpuidle_state_time(cpu, idlestate));
 	}
 }
 
@@ -74,7 +76,7 @@ static void cpuidle_general_output(void)
 {
 	char *tmp;
 
-	tmp = sysfs_get_cpuidle_driver();
+	tmp = cpuidle_get_driver();
 	if (!tmp) {
 		printf(_("Could not determine cpuidle driver\n"));
 		return;
@@ -83,7 +85,7 @@ static void cpuidle_general_output(void)
 	printf(_("CPUidle driver: %s\n"), tmp);
 	free(tmp);
 
-	tmp = sysfs_get_cpuidle_governor();
+	tmp = cpuidle_get_governor();
 	if (!tmp) {
 		printf(_("Could not determine cpuidle governor\n"));
 		return;
@@ -98,7 +100,7 @@ static void proc_cpuidle_cpu_output(unsigned int cpu)
 	long max_allowed_cstate = 2000000000;
 	unsigned int cstate, cstates;
 
-	cstates = sysfs_get_idlestate_count(cpu);
+	cstates = cpuidle_state_count(cpu);
 	if (cstates == 0) {
 		printf(_("CPU %u: No C-states info\n"), cpu);
 		return;
@@ -113,11 +115,11 @@ static void proc_cpuidle_cpu_output(unsigned int cpu)
 			 "type[C%d] "), cstate, cstate);
 		printf(_("promotion[--] demotion[--] "));
 		printf(_("latency[%03lu] "),
-		       sysfs_get_idlestate_latency(cpu, cstate));
+		       cpuidle_state_latency(cpu, cstate));
 		printf(_("usage[%08lu] "),
-		       sysfs_get_idlestate_usage(cpu, cstate));
+		       cpuidle_state_usage(cpu, cstate));
 		printf(_("duration[%020Lu] \n"),
-		       sysfs_get_idlestate_time(cpu, cstate));
+		       cpuidle_state_time(cpu, cstate));
 	}
 }
 
diff --git a/utils/cpuidle-set.c b/utils/cpuidle-set.c
index d6b6ae4..691c24d 100644
--- a/utils/cpuidle-set.c
+++ b/utils/cpuidle-set.c
@@ -5,12 +5,12 @@
 #include <limits.h>
 #include <string.h>
 #include <ctype.h>
-
 #include <getopt.h>
 
-#include "cpufreq.h"
+#include <cpufreq.h>
+#include <cpuidle.h>
+
 #include "helpers/helpers.h"
-#include "helpers/sysfs.h"
 
 static struct option info_opts[] = {
      {"disable",	required_argument,		NULL, 'd'},
@@ -104,16 +104,16 @@ int cmd_idle_set(int argc, char **argv)
 		if (!bitmask_isbitset(cpus_chosen, cpu))
 			continue;
 
-		if (sysfs_is_cpu_online(cpu) != 1)
+		if (cpupower_is_cpu_online(cpu) != 1)
 			continue;
 
-		idlestates = sysfs_get_idlestate_count(cpu);
+		idlestates = cpuidle_state_count(cpu);
 		if (idlestates <= 0)
 			continue;
 
 		switch (param) {
 		case 'd':
-			ret = sysfs_idlestate_disable(cpu, idlestate, 1);
+			ret = cpuidle_state_disable(cpu, idlestate, 1);
 			if (ret == 0)
 		printf(_("Idlestate %u disabled on CPU %u\n"),  idlestate, cpu);
 			else if (ret == -1)
@@ -126,7 +126,7 @@ int cmd_idle_set(int argc, char **argv)
 		       idlestate, cpu);
 			break;
 		case 'e':
-			ret = sysfs_idlestate_disable(cpu, idlestate, 0);
+			ret = cpuidle_state_disable(cpu, idlestate, 0);
 			if (ret == 0)
 		printf(_("Idlestate %u enabled on CPU %u\n"),  idlestate, cpu);
 			else if (ret == -1)
@@ -140,13 +140,13 @@ int cmd_idle_set(int argc, char **argv)
 			break;
 		case 'D':
 			for (idlestate = 0; idlestate < idlestates; idlestate++) {
-				disabled = sysfs_is_idlestate_disabled
+				disabled = cpuidle_is_state_disabled
 					(cpu, idlestate);
-				state_latency = sysfs_get_idlestate_latency
+				state_latency = cpuidle_state_latency
 					(cpu, idlestate);
 				if (disabled == 1) {
 					if (latency > state_latency){
-						ret = sysfs_idlestate_disable
+						ret = cpuidle_state_disable
 							(cpu, idlestate, 0);
 						if (ret == 0)
 		printf(_("Idlestate %u enabled on CPU %u\n"),  idlestate, cpu);
@@ -154,7 +154,7 @@ int cmd_idle_set(int argc, char **argv)
 					continue;
 				}
 				if (latency <= state_latency){
-					ret = sysfs_idlestate_disable
+					ret = cpuidle_state_disable
 						(cpu, idlestate, 1);
 					if (ret == 0)
 		printf(_("Idlestate %u disabled on CPU %u\n"), idlestate, cpu);
@@ -163,10 +163,10 @@ int cmd_idle_set(int argc, char **argv)
 			break;
 		case 'E':
 			for (idlestate = 0; idlestate < idlestates; idlestate++) {
-				disabled = sysfs_is_idlestate_disabled
+				disabled = cpuidle_is_state_disabled
 					(cpu, idlestate);
 				if (disabled == 1) {
-					ret = sysfs_idlestate_disable
+					ret = cpuidle_state_disable
 						(cpu, idlestate, 0);
 					if (ret == 0)
 		printf(_("Idlestate %u enabled on CPU %u\n"), idlestate, cpu);
diff --git a/utils/helpers/helpers.h b/utils/helpers/helpers.h
index aa9e954..afb66f8 100644
--- a/utils/helpers/helpers.h
+++ b/utils/helpers/helpers.h
@@ -14,6 +14,7 @@
 #include <locale.h>
 
 #include "helpers/bitmask.h"
+#include <cpupower.h>
 
 /* Internationalization ****************************/
 #ifdef NLS
@@ -92,31 +93,6 @@ extern int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info);
 extern struct cpupower_cpu_info cpupower_cpu_info;
 /* cpuid and cpuinfo helpers  **************************/
 
-struct cpuid_core_info {
-	int pkg;
-	int core;
-	int cpu;
-
-	/* flags */
-	unsigned int is_online:1;
-};
-
-/* CPU topology/hierarchy parsing ******************/
-struct cpupower_topology {
-	/* Amount of CPU cores, packages and threads per core in the system */
-	unsigned int cores;
-	unsigned int pkgs;
-	unsigned int threads; /* per core */
-
-	/* Array gets mallocated with cores entries, holding per core info */
-	struct cpuid_core_info *core_info;
-};
-
-extern int get_cpu_topology(struct cpupower_topology *cpu_top);
-extern void cpu_topology_release(struct cpupower_topology cpu_top);
-
-/* CPU topology/hierarchy parsing ******************/
-
 /* X86 ONLY ****************************************/
 #if defined(__i386__) || defined(__x86_64__)
 
diff --git a/utils/helpers/topology.c b/utils/helpers/topology.c
index 5f9c908..a1a6c60 100644
--- a/utils/helpers/topology.c
+++ b/utils/helpers/topology.c
@@ -16,110 +16,7 @@
 #include <errno.h>
 #include <fcntl.h>
 
-#include <helpers/helpers.h>
-#include <helpers/sysfs.h>
+#include <cpuidle.h>
 
-/* returns -1 on failure, 0 on success */
-static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *result)
-{
-	char linebuf[MAX_LINE_LEN];
-	char *endp;
-	char path[SYSFS_PATH_MAX];
+/* CPU topology/hierarchy parsing ******************/
 
-	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",
-			 cpu, fname);
-	if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
-		return -1;
-	*result = strtol(linebuf, &endp, 0);
-	if (endp == linebuf || errno == ERANGE)
-		return -1;
-	return 0;
-}
-
-static int __compare(const void *t1, const void *t2)
-{
-	struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1;
-	struct cpuid_core_info *top2 = (struct cpuid_core_info *)t2;
-	if (top1->pkg < top2->pkg)
-		return -1;
-	else if (top1->pkg > top2->pkg)
-		return 1;
-	else if (top1->core < top2->core)
-		return -1;
-	else if (top1->core > top2->core)
-		return 1;
-	else if (top1->cpu < top2->cpu)
-		return -1;
-	else if (top1->cpu > top2->cpu)
-		return 1;
-	else
-		return 0;
-}
-
-/*
- * Returns amount of cpus, negative on error, cpu_top must be
- * passed to cpu_topology_release to free resources
- *
- * Array is sorted after ->pkg, ->core, then ->cpu
- */
-int get_cpu_topology(struct cpupower_topology *cpu_top)
-{
-	int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF);
-
-	cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus);
-	if (cpu_top->core_info == NULL)
-		return -ENOMEM;
-	cpu_top->pkgs = cpu_top->cores = 0;
-	for (cpu = 0; cpu < cpus; cpu++) {
-		cpu_top->core_info[cpu].cpu = cpu;
-		cpu_top->core_info[cpu].is_online = sysfs_is_cpu_online(cpu);
-		if(sysfs_topology_read_file(
-			cpu,
-			"physical_package_id",
-			&(cpu_top->core_info[cpu].pkg)) < 0) {
-			cpu_top->core_info[cpu].pkg = -1;
-			cpu_top->core_info[cpu].core = -1;
-			continue;
-		}
-		if(sysfs_topology_read_file(
-			cpu,
-			"core_id",
-			&(cpu_top->core_info[cpu].core)) < 0) {
-			cpu_top->core_info[cpu].pkg = -1;
-			cpu_top->core_info[cpu].core = -1;
-			continue;
-		}
-	}
-
-	qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info),
-	      __compare);
-
-	/* Count the number of distinct pkgs values. This works
-	   because the primary sort of the core_info struct was just
-	   done by pkg value. */
-	last_pkg = cpu_top->core_info[0].pkg;
-	for(cpu = 1; cpu < cpus; cpu++) {
-		if (cpu_top->core_info[cpu].pkg != last_pkg &&
-				cpu_top->core_info[cpu].pkg != -1) {
-
-			last_pkg = cpu_top->core_info[cpu].pkg;
-			cpu_top->pkgs++;
-		}
-	}
-	if (!(cpu_top->core_info[0].pkg == -1))
-		cpu_top->pkgs++;
-
-	/* Intel's cores count is not consecutively numbered, there may
-	 * be a core_id of 3, but none of 2. Assume there always is 0
-	 * Get amount of cores by counting duplicates in a package
-	for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) {
-		if (cpu_top->core_info[cpu].core == 0)
-	cpu_top->cores++;
-	*/
-	return cpus;
-}
-
-void cpu_topology_release(struct cpupower_topology cpu_top)
-{
-	free(cpu_top.core_info);
-}
diff --git a/utils/idle_monitor/cpuidle_sysfs.c b/utils/idle_monitor/cpuidle_sysfs.c
index bcd22a1..1b5da00 100644
--- a/utils/idle_monitor/cpuidle_sysfs.c
+++ b/utils/idle_monitor/cpuidle_sysfs.c
@@ -10,8 +10,8 @@
 #include <stdint.h>
 #include <string.h>
 #include <limits.h>
+#include <cpuidle.h>
 
-#include "helpers/sysfs.h"
 #include "helpers/helpers.h"
 #include "idle_monitor/cpupower-monitor.h"
 
@@ -51,7 +51,7 @@ static int cpuidle_start(void)
 		for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
 		     state++) {
 			previous_count[cpu][state] =
-				sysfs_get_idlestate_time(cpu, state);
+				cpuidle_state_time(cpu, state);
 			dprint("CPU %d - State: %d - Val: %llu\n",
 			       cpu, state, previous_count[cpu][state]);
 		}
@@ -70,7 +70,7 @@ static int cpuidle_stop(void)
 		for (state = 0; state < cpuidle_sysfs_monitor.hw_states_num;
 		     state++) {
 			current_count[cpu][state] =
-				sysfs_get_idlestate_time(cpu, state);
+				cpuidle_state_time(cpu, state);
 			dprint("CPU %d - State: %d - Val: %llu\n",
 			       cpu, state, previous_count[cpu][state]);
 		}
@@ -132,13 +132,13 @@ static struct cpuidle_monitor *cpuidle_register(void)
 	char *tmp;
 
 	/* Assume idle state count is the same for all CPUs */
-	cpuidle_sysfs_monitor.hw_states_num = sysfs_get_idlestate_count(0);
+	cpuidle_sysfs_monitor.hw_states_num = cpuidle_state_count(0);
 
 	if (cpuidle_sysfs_monitor.hw_states_num <= 0)
 		return NULL;
 
 	for (num = 0; num < cpuidle_sysfs_monitor.hw_states_num; num++) {
-		tmp = sysfs_get_idlestate_name(0, num);
+		tmp = cpuidle_state_name(0, num);
 		if (tmp == NULL)
 			continue;
 
@@ -146,7 +146,7 @@ static struct cpuidle_monitor *cpuidle_register(void)
 		strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
 		free(tmp);
 
-		tmp = sysfs_get_idlestate_desc(0, num);
+		tmp = cpuidle_state_desc(0, num);
 		if (tmp == NULL)
 			continue;
 		strncpy(cpuidle_cstates[num].desc, tmp,	CSTATE_DESC_LEN - 1);