// SPDX-License-Identifier: GPL-2.0-only #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 "cpupower_intern.h"#include "acpi_cppc.h" /* ACPI CPPC sysfs access ***********************************************/ static int acpi_cppc_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/acpi_cppc/%s",		 cpu, fname);	return cpupower_read_sysfs(path, buf, buflen);} static const char * const acpi_cppc_value_files[] = {	[HIGHEST_PERF] = "highest_perf",	[LOWEST_PERF] = "lowest_perf",	[NOMINAL_PERF] = "nominal_perf",	[LOWEST_NONLINEAR_PERF] = "lowest_nonlinear_perf",	[LOWEST_FREQ] = "lowest_freq",	[NOMINAL_FREQ] = "nominal_freq",	[REFERENCE_PERF] = "reference_perf",	[WRAPAROUND_TIME] = "wraparound_time"}; unsigned long acpi_cppc_get_data(unsigned int cpu, enum acpi_cppc_value which){	unsigned long long value;	unsigned int len;	char linebuf[MAX_LINE_LEN];	char *endp; 	if (which >= MAX_CPPC_VALUE_FILES)		return 0; 	len = acpi_cppc_read_file(cpu, acpi_cppc_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;}