Merge "Find wall clock RTC through sysfs" (41ef80e7) · Commits · e / os / android_frameworks_base

services/core/jni/com_android_server_AlarmManagerService.cpp

+75 −5

Original line number	Diff line number	Diff line
		@@ -21,7 +21,9 @@
		#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>
		@@ -80,8 +82,8 @@ public:
		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);
		@@ -90,6 +92,7 @@ public:

		private:
		int epollfd;
		int rtc_id;
		};

		AlarmImpl::AlarmImpl(int *fds_, size_t n_fds) : fds(new int[n_fds]),
		@@ -170,9 +173,16 @@ int AlarmImplTimerFd::setTime(struct timeval *tv)
		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;
		}

		@@ -283,6 +293,66 @@ static jlong init_alarm_driver()
		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;
		@@ -308,7 +378,7 @@ static jlong init_timerfd()
		}
		}

		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;