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| 1 | #include <errno.h> |
| 2 | #include <fcntl.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <unistd.h> |
| 6 | |
| 7 | #include <iostream> |
| 8 | |
| 9 | #include "cpu.h" |
| 10 | #include "debug.h" |
| 11 | |
| 12 | #define SYSFS_CPUFREQ_DIR "/sys/devices/system/cpu/cpu0/cpufreq" |
| 13 | #define SYSFS_CPUFREQ_MAX SYSFS_CPUFREQ_DIR "/scaling_max_freq" |
| 14 | #define SYSFS_CPUFREQ_SET SYSFS_CPUFREQ_DIR "/scaling_setspeed" |
| 15 | |
| 16 | void writeStringToFile(const char *path, const char *content) |
| 17 | { |
| 18 | int fd = open(path, O_RDWR); |
| 19 | if (fd == -1) { |
| 20 | WARNING("Failed to open '%s': %s\n", path, strerror(errno)); |
| 21 | } else { |
| 22 | ssize_t written = write(fd, content, strlen(content)); |
| 23 | if (written == -1) { |
| 24 | WARNING("Error writing '%s': %s\n", path, strerror(errno)); |
| 25 | } |
| 26 | close(fd); |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | void jz_cpuspeed(unsigned clockspeed) |
| 31 | { |
| 32 | char freq[10]; |
| 33 | sprintf(freq, "%d", clockspeed * 1000); |
| 34 | writeStringToFile(SYSFS_CPUFREQ_MAX, freq); |
| 35 | writeStringToFile(SYSFS_CPUFREQ_SET, freq); |
| 36 | } |
| 37 |
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