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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/select.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/input.h>
#include <linux/watchdog.h>
#include <linux/apm_bios.h>
struct event {
struct timeval time;
unsigned short type;
unsigned short code;
unsigned int value;
};
#define eventDevice "/dev/input/event1"
#define apmDevice "/dev/apm_bios"
sig_atomic_t quit = 0;
/* write string to sysfs file
*/
static int writeStr (const char * const file, const char * const s, const size_t slen) {
int fd;
if ((fd = open (file, O_WRONLY)) == -1) {
perror ("open");
return -1;
}
if (write (fd, s, slen) == -1) {
perror ("write");
}
close (fd);
}
/* write 1 or 0 to sysfs file
*/
static int writeToggleStr (const char * const file, const int enable) {
const char *s = "0";
const size_t slen = 1;
if (enable) {
s = "1";
}
writeStr (file, s, slen);
}
/* suspend to ram
*/
static void suspend (int apmfd) {
static const char * const s = "mem";
const size_t slen = sizeof (s)-1;
if (ioctl (apmfd, APM_IOC_SUSPEND, NULL) == -1) {
perror ("ioctl suspend");
}
}
/* reboot system
*/
static void reboot () {
system ("reboot");
}
/* en/disable gps unit
*/
static void toggleGps (int enable) {
writeToggleStr ("/sys/devices/platform/n35-gps/gps_power", enable);
}
/* en/disable blue led
*/
static void toggleBlueLed (int enable) {
writeToggleStr ("/sys/devices/platform/s3c24xx_led.1/leds/blue_led/brightness", enable);
}
/* en/disable red warning led
*/
static void toggleWarningLed (int enable) {
writeToggleStr ("/sys/devices/platform/s3c24xx_led.2/leds/warning_led/brightness", enable);
}
void handleSignal (int signum) {
switch (signum) {
case SIGTERM:
case SIGINT:
quit = 1;
break;
}
}
int main (int argc, char **argv) {
int eventfd, watchdogfd, apmfd, maxfd;
int blueBlink = 0, suspended = 0;
enum {BLUE_OFF = 0, BLUE_ON = 1} blinkState = BLUE_OFF;
struct sigaction sact;
/* FIXME: check initial gps antenna state (how?) */
memset (&sact, 0, sizeof (sact));
sact.sa_handler = handleSignal;
sigaction (SIGTERM, &sact, NULL);
sigaction (SIGINT, &sact, NULL);
if ((eventfd = open (eventDevice, O_RDONLY)) == -1) {
perror ("open event");
return 1;
}
if ((apmfd = open (apmDevice, O_RDWR)) == -1) {
perror ("open apm");
return 1;
}
maxfd = eventfd > apmfd ? eventfd : apmfd;
++maxfd;
#if 0
if ((watchdogfd = open ("/dev/watchdog", O_WRONLY)) == -1) {
perror ("open watchdog");
return -1;
}
int timeout;
ioctl(watchdogfd, WDIOC_GETTIMEOUT, &timeout);
printf("The timeout was is %d seconds\n", timeout);
/* we’re not dead and purposefully closed the device */
write (watchdogfd, "V", 1);
close (watchdogfd);
#endif
while (!quit) {
fd_set rfds;
struct timeval tv;
int ret;
FD_ZERO(&rfds);
FD_SET(eventfd, &rfds);
FD_SET(apmfd, &rfds);
if (blueBlink) {
if (blinkState == BLUE_ON) {
tv.tv_sec = 0;
tv.tv_usec = 100000;
} else {
tv.tv_sec = 1;
tv.tv_usec = 0;
}
}
ret = select (maxfd, &rfds, NULL, NULL, blueBlink ? &tv : NULL);
if (ret == -1) {
perror ("select");
break;
} else if (ret > 0) {
if (FD_ISSET (eventfd, &rfds)) {
/* handle key press events */
struct event ev;
if (read (eventfd, &ev, sizeof (ev)) == -1) {
perror ("read");
}
printf ("time: %u sec %u usec, type %x, code %x, value %x\n",
ev.time.tv_sec, ev.time.tv_usec, ev.type, ev.code,
ev.value);
if (ev.type == EV_KEY) {
switch (ev.code) {
case KEY_POWER:
/* suspend */
if (ev.value == 1) {
if (suspended > 0) {
/* prevent wakeup keypress from suspending
* again */
--suspended;
} else {
/* make sure device does not wake ap again */
usleep (100000);
suspended = 1;
suspend (apmfd);
}
}
break;
case KEY_POWER2:
/* reboot */
if (ev.value == 1) {
reboot ();
}
break;
case SW_RADIO:
/* toggle gps power */
toggleGps ((ev.value == 1));
blueBlink = (ev.value == 1);
toggleBlueLed (0);
break;
}
}
} else if (FD_ISSET (apmfd, &rfds)) {
/* handle apm events */
apm_event_t ev;
if (read (apmfd, &ev, sizeof (ev)) == -1) {
perror ("read");
break;
}
printf ("got apm event %x\n", ev);
switch (ev) {
case APM_NORMAL_RESUME:
/* device resumed from suspend */
break;
#if 0
/* this is done by the hardware (8% left) */
case APM_LOW_BATTERY:
toggleWarningLed (1);
break;
#endif
/* the apm driver is unable to send these events atm */
case APM_POWER_STATUS_CHANGE:
/* ? */
break;
}
}
}
if (blueBlink) {
blinkState = !blinkState;
toggleBlueLed (blinkState);
}
}
/* make sure the windows are closed before leaving */
toggleGps (0);
toggleBlueLed (0);
toggleWarningLed (0);
close (eventfd);
close (apmfd);
return 0;
}
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