new file mode 100644
@@ -0,0 +1,3 @@
+libthermal_tools-y += mainloop.o
+libthermal_tools-y += log.o
+libthermal_tools-y += uptimeofday.o
new file mode 100644
@@ -0,0 +1,158 @@
+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+# Most of this file is copied from tools/lib/perf/Makefile
+
+LIBTHERMAL_TOOLS_VERSION = 0
+LIBTHERMAL_TOOLS_PATCHLEVEL = 0
+LIBTHERMAL_TOOLS_EXTRAVERSION = 1
+
+MAKEFLAGS += --no-print-directory
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+# $(info Determined 'srctree' to be $(srctree))
+endif
+
+INSTALL = install
+
+# Use DESTDIR for installing into a different root directory.
+# This is useful for building a package. The program will be
+# installed in this directory as if it was the root directory.
+# Then the build tool can move it later.
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+include $(srctree)/tools/scripts/Makefile.include
+include $(srctree)/tools/scripts/Makefile.arch
+
+ifeq ($(LP64), 1)
+ libdir_relative = lib64
+else
+ libdir_relative = lib
+endif
+
+prefix ?=
+libdir = $(prefix)/$(libdir_relative)
+
+# Shell quotes
+libdir_SQ = $(subst ','\'',$(libdir))
+libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
+
+ifeq ("$(origin V)", "command line")
+ VERBOSE = $(V)
+endif
+ifndef VERBOSE
+ VERBOSE = 0
+endif
+
+ifeq ($(VERBOSE),1)
+ Q =
+else
+ Q = @
+endif
+
+# Set compile option CFLAGS
+ifdef EXTRA_CFLAGS
+ CFLAGS := $(EXTRA_CFLAGS)
+else
+ CFLAGS := -g -Wall
+endif
+
+INCLUDES = \
+-I/usr/include/libnl3 \
+-I$(srctree)/tools/lib/thermal/include \
+-I$(srctree)/tools/lib/ \
+-I$(srctree)/tools/include \
+-I$(srctree)/tools/arch/$(SRCARCH)/include/ \
+-I$(srctree)/tools/arch/$(SRCARCH)/include/uapi \
+-I$(srctree)/tools/include/uapi
+
+# Append required CFLAGS
+override CFLAGS += $(EXTRA_WARNINGS)
+override CFLAGS += -Werror -Wall
+override CFLAGS += -fPIC
+override CFLAGS += $(INCLUDES)
+override CFGLAS += -Wl,-L.
+override CFGLAS += -Wl,-lthermal
+
+all:
+
+export srctree OUTPUT CC LD CFLAGS V
+export DESTDIR DESTDIR_SQ
+
+include $(srctree)/tools/build/Makefile.include
+
+PATCHLEVEL = $(LIBTHERMAL_TOOLS_PATCHLEVEL)
+EXTRAVERSION = $(LIBTHERMAL_TOOLS_EXTRAVERSION)
+VERSION = $(LIBTHERMAL_TOOLS_VERSION).$(LIBTHERMAL_TOOLS_PATCHLEVEL).$(LIBTHERMAL_TOOLS_EXTRAVERSION)
+
+LIBTHERMAL_TOOLS_SO := $(OUTPUT)libthermal_tools.so.$(VERSION)
+LIBTHERMAL_TOOLS_A := $(OUTPUT)libthermal_tools.a
+LIBTHERMAL_TOOLS_IN := $(OUTPUT)libthermal_tools-in.o
+LIBTHERMAL_TOOLS_PC := $(OUTPUT)libthermal_tools.pc
+
+LIBTHERMAL_TOOLS_ALL := $(LIBTHERMAL_TOOLS_A) $(OUTPUT)libthermal_tools.so*
+
+$(LIBTHERMAL_TOOLS_IN): FORCE
+ $(Q)$(MAKE) $(build)=libthermal_tools
+
+$(LIBTHERMAL_TOOLS_A): $(LIBTHERMAL_TOOLS_IN)
+ $(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIBTHERMAL_TOOLS_IN)
+
+$(LIBTHERMAL_TOOLS_SO): $(LIBTHERMAL_TOOLS_IN)
+ $(QUIET_LINK)$(CC) --shared -Wl,-soname,libthermal_tools.so $^ -o $@
+ @ln -sf $(@F) $(OUTPUT)libthermal_tools.so
+ @ln -sf $(@F) $(OUTPUT)libthermal_tools.so.$(LIBTHERMAL_TOOLS_VERSION)
+
+
+libs: $(LIBTHERMAL_TOOLS_A) $(LIBTHERMAL_TOOLS_SO) $(LIBTHERMAL_TOOLS_PC)
+
+all: fixdep
+ $(Q)$(MAKE) libs
+
+clean:
+ $(call QUIET_CLEAN, libthermal_tools) $(RM) $(LIBTHERMAL_TOOLS_A) \
+ *.o *~ *.a *.so *.so.$(VERSION) *.so.$(LIBTHERMAL_TOOLS_VERSION) .*.d .*.cmd LIBTHERMAL_TOOLS-CFLAGS $(LIBTHERMAL_TOOLS_PC)
+
+$(LIBTHERMAL_TOOLS_PC):
+ $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
+ -e "s|@LIBDIR@|$(libdir_SQ)|" \
+ -e "s|@VERSION@|$(VERSION)|" \
+ < libthermal_tools.pc.template > $@
+
+define do_install_mkdir
+ if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
+ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
+ fi
+endef
+
+define do_install
+ if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
+ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
+ fi; \
+ $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
+endef
+
+install_lib: libs
+ $(call QUIET_INSTALL, $(LIBTHERMAL_TOOLS_ALL)) \
+ $(call do_install_mkdir,$(libdir_SQ)); \
+ cp -fpR $(LIBTHERMAL_TOOLS_ALL) $(DESTDIR)$(libdir_SQ)
+
+install_headers:
+ $(call QUIET_INSTALL, headers) \
+ $(call do_install,include/thermal.h,$(prefix)/include/thermal,644); \
+
+install_pkgconfig: $(LIBTHERMAL_TOOLS_PC)
+ $(call QUIET_INSTALL, $(LIBTHERMAL_TOOLS_PC)) \
+ $(call do_install,$(LIBTHERMAL_TOOLS_PC),$(libdir_SQ)/pkgconfig,644)
+
+install_doc:
+ $(Q)$(MAKE) -C Documentation install-man install-html install-examples
+
+#install: install_lib install_headers install_pkgconfig install_doc
+install: install_lib install_headers install_pkgconfig
+
+FORCE:
+
+.PHONY: all install clean FORCE
new file mode 100644
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+prefix=@PREFIX@
+libdir=@LIBDIR@
+includedir=${prefix}/include
+
+Name: libthermal
+Description: thermal library
+Requires: libnl-3.0 libnl-genl-3.0
+Version: @VERSION@
+Libs: -L${libdir} -lnl-genl-3 -lnl-3
+Cflags: -I${includedir} -I{include}/libnl3
new file mode 100644
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include "log.h"
+
+static const char *__ident = "unknown";
+static int __options;
+
+static const char * const loglvl[] = {
+ [LOG_DEBUG] = "DEBUG",
+ [LOG_INFO] = "INFO",
+ [LOG_NOTICE] = "NOTICE",
+ [LOG_WARNING] = "WARN",
+ [LOG_ERR] = "ERROR",
+ [LOG_CRIT] = "CRITICAL",
+ [LOG_ALERT] = "ALERT",
+ [LOG_EMERG] = "EMERG",
+};
+
+int log_str2level(const char *lvl)
+{
+ int i;
+
+ for (i = 0; i < sizeof(loglvl) / sizeof(loglvl[LOG_DEBUG]); i++)
+ if (!strcmp(lvl, loglvl[i]))
+ return i;
+
+ return LOG_DEBUG;
+}
+
+extern void logit(int level, const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+
+ if (__options & TO_SYSLOG)
+ vsyslog(level, format, args);
+
+ if (__options & TO_STDERR)
+ vfprintf(stderr, format, args);
+
+ if (__options & TO_STDOUT)
+ vfprintf(stdout, format, args);
+
+ va_end(args);
+}
+
+int log_init(int level, const char *ident, int options)
+{
+ if (!options)
+ return -1;
+
+ if (level > LOG_DEBUG)
+ return -1;
+
+ if (!ident)
+ return -1;
+
+ __ident = ident;
+ __options = options;
+
+ if (options & TO_SYSLOG) {
+ openlog(__ident, options | LOG_NDELAY, LOG_USER);
+ setlogmask(LOG_UPTO(level));
+ }
+
+ return 0;
+}
+
+void log_exit(void)
+{
+ closelog();
+}
new file mode 100644
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS_LOG_H
+#define __THERMAL_TOOLS_LOG_H
+
+#include <syslog.h>
+
+#ifndef __maybe_unused
+#define __maybe_unused __attribute__((__unused__))
+#endif
+
+#define TO_SYSLOG 0x1
+#define TO_STDOUT 0x2
+#define TO_STDERR 0x4
+
+extern void logit(int level, const char *format, ...);
+
+#define DEBUG(fmt, ...) logit(LOG_DEBUG, "%s:%d: " fmt, __func__, __LINE__, ##__VA_ARGS__)
+#define INFO(fmt, ...) logit(LOG_INFO, fmt, ##__VA_ARGS__)
+#define NOTICE(fmt, ...) logit(LOG_NOTICE, fmt, ##__VA_ARGS__)
+#define WARN(fmt, ...) logit(LOG_WARNING, fmt, ##__VA_ARGS__)
+#define ERROR(fmt, ...) logit(LOG_ERR, fmt, ##__VA_ARGS__)
+#define CRITICAL(fmt, ...) logit(LOG_CRIT, fmt, ##__VA_ARGS__)
+#define ALERT(fmt, ...) logit(LOG_ALERT, fmt, ##__VA_ARGS__)
+#define EMERG(fmt, ...) logit(LOG_EMERG, fmt, ##__VA_ARGS__)
+
+int log_init(int level, const char *ident, int options);
+int log_str2level(const char *lvl);
+void log_exit(void);
+
+#endif
new file mode 100644
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/epoll.h>
+#include "mainloop.h"
+#include "log.h"
+
+static int epfd = -1;
+static unsigned short nrhandler;
+static sig_atomic_t exit_mainloop;
+
+struct mainloop_data {
+ mainloop_callback_t cb;
+ void *data;
+ int fd;
+};
+
+static struct mainloop_data **mds;
+
+#define MAX_EVENTS 10
+
+int mainloop(unsigned int timeout)
+{
+ int i, nfds;
+ struct epoll_event events[MAX_EVENTS];
+ struct mainloop_data *md;
+
+ if (epfd < 0)
+ return -1;
+
+ for (;;) {
+
+ nfds = epoll_wait(epfd, events, MAX_EVENTS, timeout);
+
+ if (exit_mainloop || !nfds)
+ return 0;
+
+ if (nfds < 0) {
+ if (errno == EINTR)
+ continue;
+ return -1;
+ }
+
+ for (i = 0; i < nfds; i++) {
+ md = events[i].data.ptr;
+
+ if (md->cb(md->fd, md->data) > 0)
+ return 0;
+ }
+ }
+}
+
+int mainloop_add(int fd, mainloop_callback_t cb, void *data)
+{
+ struct epoll_event ev = {
+ .events = EPOLLIN,
+ };
+
+ struct mainloop_data *md;
+
+ if (fd >= nrhandler) {
+ mds = realloc(mds, sizeof(*mds) * (fd + 1));
+ if (!mds)
+ return -1;
+ nrhandler = fd + 1;
+ }
+
+ md = malloc(sizeof(*md));
+ if (!md)
+ return -1;
+
+ md->data = data;
+ md->cb = cb;
+ md->fd = fd;
+
+ mds[fd] = md;
+ ev.data.ptr = md;
+
+ if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) < 0) {
+ free(md);
+ return -1;
+ }
+
+ return 0;
+}
+
+int mainloop_del(int fd)
+{
+ if (fd >= nrhandler)
+ return -1;
+
+ if (epoll_ctl(epfd, EPOLL_CTL_DEL, fd, NULL) < 0)
+ return -1;
+
+ free(mds[fd]);
+
+ return 0;
+}
+
+int mainloop_init(void)
+{
+ epfd = epoll_create(2);
+ if (epfd < 0)
+ return -1;
+
+ return 0;
+}
+
+void mainloop_exit(void)
+{
+ exit_mainloop = 1;
+}
+
+void mainloop_fini(void)
+{
+ close(epfd);
+}
new file mode 100644
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS_MAINLOOP_H
+#define __THERMAL_TOOLS_MAINLOOP_H
+
+typedef int (*mainloop_callback_t)(int fd, void *data);
+
+extern int mainloop(unsigned int timeout);
+extern int mainloop_add(int fd, mainloop_callback_t cb, void *data);
+extern int mainloop_del(int fd);
+extern void mainloop_exit(void);
+extern int mainloop_init(void);
+extern void mainloop_fini(void);
+
+#endif
new file mode 100644
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS
+#define __THERMAL_TOOLS
+
+#include "log.h"
+#include "mainloop.h"
+#include "uptimeofday.h"
+
+#endif
new file mode 100644
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdio.h>
+#include <sys/time.h>
+#include <linux/sysinfo.h>
+#include "thermal-tools.h"
+
+static unsigned long __offset;
+static struct timeval __tv;
+
+int uptimeofday_init(void)
+{
+ struct sysinfo info;
+
+ if (sysinfo(&info))
+ return -1;
+
+ gettimeofday(&__tv, NULL);
+
+ __offset = __tv.tv_sec - info.uptime;
+
+ return 0;
+}
+
+unsigned long getuptimeofday_ms(void)
+{
+ gettimeofday(&__tv, NULL);
+
+ return ((__tv.tv_sec - __offset) * 1000) + (__tv.tv_usec / 1000);
+}
+
+struct timespec msec_to_timespec(int msec)
+{
+ struct timespec tv = {
+ .tv_sec = (msec / 1000),
+ .tv_nsec = (msec % 1000) * 1000000,
+ };
+
+ return tv;
+}
new file mode 100644
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS_UPTIMEOFDAY_H
+#define __THERMAL_TOOLS_UPTIMEOFDAY_H
+#include <sys/sysinfo.h>
+#include <sys/time.h>
+
+int uptimeofday_init(void);
+unsigned long getuptimeofday_ms(void);
+struct timespec msec_to_timespec(int msec);
+
+#endif