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Added a new command line flag to display messages about the temperatu…
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…re and the set fan level. The algorithm for setting a new fan level has been slightly redesigned, now it changes only if the current temperature goes beyond the minimum or maximum.
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@KikyTokamuro
KikyTokamuro committed Nov 6, 2021
1 parent 82758e5 commit f1b3a6d
Showing 1 changed file with 60 additions and 53 deletions.
113 changes: 60 additions & 53 deletions tf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,20 +22,20 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#include <argp.h>
#include <libconfig.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <libconfig.h>
#include <string.h>
#include <unistd.h>
#include <argp.h>

// Process status
int run = 1;

// Config vars
const char *temperature_f;
const char *fan_f;
int sleep_t;
int sleep_t;

// Struct level items
typedef struct level_e {
Expand All @@ -53,9 +53,10 @@ const char doc[] = "tf - tiny program for fan control Thinkpad notebooks";

// Arguments
static struct argp_option options[] = {
{"config", 'c', "CONFIG", 0, "Path to config file (default: /etc/tf.cfg)"},
{"info", 'i', 0, 0, "Displaying messages about temperature and fan level (default: false)"},
{0}
{"config", 'c', "CONFIG", 0, "Path to config file (default: /etc/tf.cfg)"},
{"info", 'i', 0, 0,
"Displaying messages about temperature and fan level (default: false)"},
{0}
};

struct arguments {
Expand All @@ -66,13 +67,18 @@ struct arguments {
// Parsing arguments
static error_t parse_opt(int key, char *arg, struct argp_state *state) {
struct arguments *arguments = state->input;

switch (key) {
case 'c': arguments->config = arg; break;
case 'i': arguments->info = 1; break;
default: return ARGP_ERR_UNKNOWN;
case 'c':
arguments->config = arg;
break;
case 'i':
arguments->info = 1;
break;
default:
return ARGP_ERR_UNKNOWN;
}

return 0;
}

Expand All @@ -85,17 +91,17 @@ void fan_write(int level) {
fprintf(stderr, "Failed to open %s.\n", fan_f);
exit(1);
}

if (level == -1) {
fprintf(fan, "level auto\n");
fclose(fan);
return;
}

// Message for fan_write
char message[12] = {'\0'};
snprintf(message, sizeof(message), "level %d", level);

fprintf(fan, "%s\n", message);
fclose(fan);
}
Expand All @@ -108,10 +114,10 @@ int get_temp() {
exit(1);
}

int temp_c;
int temp_c;
fscanf(temp, "%d", &temp_c);
temp_c /= 1000;

fclose(temp);

return temp_c;
Expand All @@ -126,22 +132,22 @@ void kill_handler(int sig) {
void signals_init() {
// Signal set setup
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGTERM);

// Sigaction setup
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = kill_handler;
act.sa_mask = set;

// SIGINT
if (sigaction(SIGINT, &act, NULL) < 0) {
fprintf(stderr, "Failed setup handler for SIGINT signal.\n");
exit(1);
}

// SIGTERM
if (sigaction(SIGTERM, &act, NULL) < 0) {
fprintf(stderr, "Failed setup handler for SIGTERM signal.\n");
Expand All @@ -152,71 +158,71 @@ void signals_init() {
int main(int argc, char **argv) {
// Init signals
signals_init();

// Arguments
struct arguments arguments;
arguments.config = "/etc/tf.cfg";
arguments.info = 0;
argp_parse(&argp, argc, argv, 0, 0, &arguments);

// Init config
config_t cfg;
config_setting_t *level_settings;
config_init(&cfg);

// Read config file
if (!config_read_file(&cfg, arguments.config)) {
fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
config_error_line(&cfg), config_error_text(&cfg));
config_error_line(&cfg), config_error_text(&cfg));
config_destroy(&cfg);
return 1;
}

// Read temperature param from config
if (!config_lookup_string(&cfg, "temperature", &temperature_f)) {
fprintf(stderr, "Failed read temperature param from config file.\n");
config_destroy(&cfg);
return 1;
}

// Read fan param from config
if (!config_lookup_string(&cfg, "fan", &fan_f)) {
fprintf(stderr, "Failed read fan param from config file.\n");
config_destroy(&cfg);
return 1;
}

// Read sleep param from config
if (!config_lookup_int(&cfg, "sleep", &sleep_t)) {
fprintf(stderr, "Failed read sleep param from config file.\n");
config_destroy(&cfg);
return 1;
}

// Read levels params from config
level_settings = config_lookup(&cfg, "levels");
if (level_settings != NULL) {
int count = config_setting_length(level_settings);

if ((count < 8) || (count > 8)) {
fprintf(stderr, "The count of levels must be 8 (0-7).\n");
config_destroy(&cfg);
return 1;
}

levels = malloc(count * sizeof(level_e));

for (int i = 0; i < count; i++) {
config_setting_t *level = config_setting_get_elem(level_settings, i);

int min, max;

if (!(config_setting_lookup_int(level, "min", &min) &&
config_setting_lookup_int(level, "max", &max))) {
fprintf(stderr, "Failed read level param from level%d", i);
return 1;
config_setting_lookup_int(level, "max", &max))) {
fprintf(stderr, "Failed read level param from level%d", i);
return 1;
}

levels[i].min = min;
levels[i].max = max;
}
Expand All @@ -225,40 +231,41 @@ int main(int argc, char **argv) {
config_destroy(&cfg);
return 1;
}

// Current fan level
unsigned short current_level = 0;

// Install level 0
fan_write(current_level);

while (run) {
//Current cpu temp
// Current cpu temp
int cpu = get_temp();

// Get min and max for current level
int current_min = levels[current_level].min;
int current_max = levels[current_level].max;

// CPU temp control
if (!(cpu > current_min && cpu < current_max)) {
if (current_level < 7 && cpu >= current_max) {
current_level++;
fan_write(current_level);
current_level++;
fan_write(current_level);
} else if (current_level > 0 && cpu <= current_min) {
current_level--;
fan_write(current_level);
current_level--;
fan_write(current_level);
}

if (arguments.info) {
fprintf(stdout, "Current temperature %d. Level %d is set\n", cpu, current_level);
fflush(stdout);
fprintf(stdout, "Current temperature %d. Level %d is set\n", cpu,
current_level);
fflush(stdout);
}
}

sleep(sleep_t);
}

fan_write(-1);
config_destroy(&cfg);
free(levels);
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