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aad.c
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aad.c
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#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <event.h>
/*******************************
* read_ec:
* wait_write_ec -> wait_write(0x66)
*
* wait_write(addr):
* while(inb(addr) & 0x02)
* sleep(0.01)
*
*
*
*/
/* REGISTERS */
#define TEMPERATURE 0x58
#define FAN 0x55
#define _READ 0x01
#define _WRITE 0x02
/* TEMPERATURE SETTINGS */
#define START_TEMP 59
#define STOP_TEMP 49
#define FAN_OFF 0x00
#define FAN_ON 0x01
#define true 1
#define false 0
/*******************************/
int lasttime;
int port;
int logfile;
unsigned char fan_state = 0;
unsigned char speed = 1;
struct timeval interval;
unsigned char demon = false;
unsigned char logger = false;
unsigned char _inb(unsigned char addr) {
off_t r;
unsigned char buf = 0;
r = lseek(port, addr, SEEK_SET);
read(port,&buf,1);
/*printf("_%02x_\n", buf);*/
return buf;
}
void _outb(unsigned char addr, unsigned char val) {
off_t r;
r = lseek(port, addr, SEEK_SET);
write(port,&val,1);
}
unsigned char wait_ec(unsigned char rw) {
unsigned int l = 0;
if( rw == _READ ) {
while( !( _inb(0x66) & _READ) && ( l < 10000 ) ) {
usleep(10000);
l++;
}
} else {
while( ( _inb(0x66) & _WRITE) && ( l < 10000 ) ) {
usleep(10000);
l++;
}
}
return -(l == 10000);
}
unsigned char read_temperature() {
if( !wait_ec(_WRITE) )
_outb(0x66, 0x80);
if( !wait_ec(_WRITE) )
_outb(0x62, TEMPERATURE);
if( !wait_ec(_READ) )
return(_inb(0x62));
}
void set_fan(unsigned char speed) {
if( !wait_ec(_WRITE) )
_outb(0x66, 0x81);
if( !wait_ec(_WRITE) )
_outb(0x62, FAN);
if( !wait_ec(_WRITE) )
_outb(0x62, speed);
}
void start_fan(void) {
set_fan(speed);
fan_state = FAN_ON;
}
void stop_fan(void) {
set_fan(0x1f);
fan_state = FAN_OFF;
}
static void worker(int fd, short event, void *arg) {
struct timeval tv;
struct event *timeout = arg;
int newtime = time(NULL);
unsigned char buf = 0;
char wbuf[80];
unsigned char len = 0;
off_t r;
time_t now;
char timebuf[40];
buf = read_temperature();
now = time(NULL);
strftime(timebuf, 40, "%c", localtime(&now));
switch(fan_state) {
case FAN_OFF:
if( buf >= START_TEMP )
start_fan();
break;
case FAN_ON:
if( buf <= STOP_TEMP )
stop_fan();
break;
}
if( logger ) {
len = sprintf(wbuf, "[%s] fan_state: %d temp: %d deg c\n",
timebuf, fan_state, buf);
if( !demon )
write(1, wbuf, len);
write(logfile, wbuf, len);
}
lasttime = newtime;
evutil_timerclear(&tv);
tv.tv_sec = interval.tv_sec;
event_add(timeout, &tv);
}
void daemonize(void) {
/* Our process ID and Session ID */
pid_t pid, sid;
/* Fork off the parent process */
pid = fork();
if (pid < 0) {
exit(EXIT_FAILURE);
}
/* If we got a good PID, then
we can exit the parent process. */
if (pid > 0) {
exit(EXIT_SUCCESS);
}
/* Change the file mode mask */
umask(0);
/* Open any logs here */
/* Create a new SID for the child process */
sid = setsid();
if (sid < 0) {
/* Log the failure */
exit(EXIT_FAILURE);
}
}
void start_timer(struct timeval freq) {
struct event timeout;
struct timeval tv;
/* Initalize the event library */
event_init();
/* Initalize one event */
evtimer_set(&timeout, worker, &timeout);
evutil_timerclear(&tv);
tv.tv_sec = freq.tv_sec;
event_add(&timeout, &tv);
lasttime = time(NULL);
event_dispatch();
}
void signal_handler(int signal) {
if( !demon )
printf("shutting down on signal %02d ...", signal);
close(port);
if( logger )
close(logfile);
if( !demon )
printf("done\n");
exit(1);
}
int main(int argc, char *argv[]) {
char dev[] = "/dev/port";
char lfile[] = "/var/log/aad.log";
char errorbuf[80];
interval.tv_sec = 2;
// -d : daemonize
// -i 2 : interval
// -l : log
// -s : speed
int c;
if( (port = open(dev, O_RDWR)) == -1 ) {
/* ERROR */
strerror(errno,errorbuf,sizeof(errorbuf));
perror(errorbuf);
return -1;
}
if( (logfile = open(lfile, O_RDWR|O_TRUNC|O_CREAT,0600)) == -1 ) {
/* ERROR */
strerror(errno,errorbuf,sizeof(errorbuf));
perror(errorbuf);
return -1;
}
signal(SIGINT, signal_handler);
signal(SIGTERM, signal_handler);
while((c = getopt(argc,argv,"di:ls:")) != -1) {
switch(c) {
case 'd':
demon = true;
printf("daemonize\n");
break;
case 'i':
interval.tv_sec = atoi(optarg);
printf("interval %02d\n", interval.tv_sec);
break;
case 'l':
logger = true;
break;
case 's':
speed = atoi(optarg);
printf("speed %02d\n", speed);
break;
default:
printf("unknown option\n");
exit(-1);
}
}
// defined start condition, fan off
stop_fan();
if( demon )
daemonize();
start_timer(interval);
return 0;
}