#include "jni.h"
#include <utils/Log.h>
#include <utils/misc.h>
+#include <utils/String8.h>
+#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
class AlarmImplTimerFd : public AlarmImpl
{
public:
- AlarmImplTimerFd(int fds[N_ANDROID_TIMERFDS], int epollfd) :
- AlarmImpl(fds, N_ANDROID_TIMERFDS), epollfd(epollfd) { }
+ AlarmImplTimerFd(int fds[N_ANDROID_TIMERFDS], int epollfd, int rtc_id) :
+ AlarmImpl(fds, N_ANDROID_TIMERFDS), epollfd(epollfd), rtc_id(rtc_id) { }
~AlarmImplTimerFd();
int set(int type, struct timespec *ts);
private:
int epollfd;
+ int rtc_id;
};
AlarmImpl::AlarmImpl(int *fds_, size_t n_fds) : fds(new int[n_fds]),
return -1;
}
- fd = open("/dev/rtc0", O_RDWR);
+ if (rtc_id < 0) {
+ ALOGV("Not setting RTC because wall clock RTC was not found");
+ errno = ENODEV;
+ return -1;
+ }
+
+ android::String8 rtc_dev = String8::format("/dev/rtc%d", rtc_id);
+ fd = open(rtc_dev.string(), O_RDWR);
if (fd < 0) {
- ALOGV("Unable to open RTC driver: %s\n", strerror(errno));
+ ALOGV("Unable to open %s: %s\n", rtc_dev.string(), strerror(errno));
return res;
}
return reinterpret_cast<jlong>(ret);
}
+static const char rtc_sysfs[] = "/sys/class/rtc";
+
+static bool rtc_is_hctosys(unsigned int rtc_id)
+{
+ android::String8 hctosys_path = String8::format("%s/rtc%u/hctosys",
+ rtc_sysfs, rtc_id);
+
+ FILE *file = fopen(hctosys_path.string(), "re");
+ if (!file) {
+ ALOGE("failed to open %s: %s", hctosys_path.string(), strerror(errno));
+ return false;
+ }
+
+ unsigned int hctosys;
+ bool ret = false;
+ int err = fscanf(file, "%u", &hctosys);
+ if (err == EOF)
+ ALOGE("failed to read from %s: %s", hctosys_path.string(),
+ strerror(errno));
+ else if (err == 0)
+ ALOGE("%s did not have expected contents", hctosys_path.string());
+ else
+ ret = hctosys;
+
+ fclose(file);
+ return ret;
+}
+
+static int wall_clock_rtc()
+{
+ DIR *dir = opendir(rtc_sysfs);
+ if (!dir) {
+ ALOGE("failed to open %s: %s", rtc_sysfs, strerror(errno));
+ return -1;
+ }
+
+ struct dirent *dirent;
+ while (errno = 0, dirent = readdir(dir)) {
+ unsigned int rtc_id;
+ int matched = sscanf(dirent->d_name, "rtc%u", &rtc_id);
+
+ if (matched < 0)
+ break;
+ else if (matched != 1)
+ continue;
+
+ if (rtc_is_hctosys(rtc_id)) {
+ ALOGV("found wall clock RTC %u", rtc_id);
+ return rtc_id;
+ }
+ }
+
+ if (errno == 0)
+ ALOGW("no wall clock RTC found");
+ else
+ ALOGE("failed to enumerate RTCs: %s", strerror(errno));
+
+ return -1;
+}
+
static jlong init_timerfd()
{
int epollfd;
}
}
- AlarmImpl *ret = new AlarmImplTimerFd(fds, epollfd);
+ AlarmImpl *ret = new AlarmImplTimerFd(fds, epollfd, wall_clock_rtc());
for (size_t i = 0; i < N_ANDROID_TIMERFDS; i++) {
epoll_event event;