RTC: Add support RTC alarms on hosted targets
Only AGPTeck Rocker is enabled for now, and it doesn't work properly: * No generic way to determine wakeup reason under Linux * No generic way to be asynchronously notified if the alarm is triggered when we're already awake * Shutting down may clobber RTC wakeup (driver/etc dependent) And finally: * AGPTek kernel's RTC driver has some 24h clock and some timezone-related issues. So, the infrastructure is arguably useful, but the only applicable hardware I have is pathologically brain-dead. Change-Id: Iac6a26a9b6e4efec5d0b3030b87f456eb23fc01d
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2 changed files with 149 additions and 8 deletions
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@ -66,6 +66,9 @@
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/* define this if you have a real-time clock */
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/* define this if you have a real-time clock */
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#define CONFIG_RTC APPLICATION
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#define CONFIG_RTC APPLICATION
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/* Define if the device can wake from an RTC alarm */
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#define HAVE_RTC_ALARM
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/* The number of bytes reserved for loadable codecs */
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/* The number of bytes reserved for loadable codecs */
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#define CODEC_SIZE 0x80000
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#define CODEC_SIZE 0x80000
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@ -27,9 +27,14 @@
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#include <linux/rtc.h>
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#include <linux/rtc.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <stdbool.h>
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#endif
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#endif
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#include "config.h"
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void rtc_init(void)
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void rtc_init(void)
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{
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{
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tzset();
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}
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}
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int rtc_read_datetime(struct tm *tm)
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int rtc_read_datetime(struct tm *tm)
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@ -46,8 +51,6 @@ int rtc_write_datetime(const struct tm *tm)
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struct timeval tv;
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struct timeval tv;
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struct tm *tm_time;
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struct tm *tm_time;
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int rtc = open("/dev/rtc0", O_WRONLY);
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tv.tv_sec = mktime((struct tm *)tm);
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tv.tv_sec = mktime((struct tm *)tm);
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tv.tv_usec = 0;
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tv.tv_usec = 0;
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@ -58,12 +61,147 @@ int rtc_write_datetime(const struct tm *tm)
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time_t now = time(NULL);
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time_t now = time(NULL);
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tm_time = gmtime(&now);
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tm_time = gmtime(&now);
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ioctl(rtc, RTC_SET_TIME, (struct rtc_time *)tm_time);
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/* Try to write the HW RTC, if present. */
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int rtc = open("/dev/rtc0", O_WRONLY);
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if (rtc > 0) {
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ioctl(rtc, RTC_SET_TIME, (struct rtc_time *)tm_time);
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close(rtc);
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}
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#else
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(void)(*tm);
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#endif
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return 0;
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}
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#if defined(HAVE_RTC_ALARM) && !defined(SIMULATOR)
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void rtc_set_alarm(int h, int m)
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{
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struct rtc_time tm;
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long sec;
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int rtc = open("/dev/rtc0", O_WRONLY);
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if (rtc < 0)
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return;
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/* Get RTC time */
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ioctl(rtc, RTC_RD_TIME, &tm);
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/* Convert to seconds into the GMT day. Can be negative! */
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sec = h * 3600 + m * 60 + timezone;
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h = sec / 3600;
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sec -= h * 3600;
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m = sec / 60;
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/* Handle negative or positive wraps */
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while (m < 0) {
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m += 60;
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h--;
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}
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while (m > 59) {
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m -= 60;
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h++;
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}
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while (h < 0) {
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h += 24;
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tm.tm_mday--;
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}
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while (h > 23) {
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h -= 24;
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tm.tm_mday++;
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}
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/* Update the struct */
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tm.tm_sec = 0;
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tm.tm_hour = h;
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tm.tm_min = m;
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ioctl(rtc, RTC_ALM_SET, &tm);
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close(rtc);
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}
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void rtc_get_alarm(int *h, int *m)
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{
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struct rtc_time tm;
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long sec;
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int rtc = open("/dev/rtc0", O_WRONLY);
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if (rtc < 0)
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return;
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ioctl(rtc, RTC_ALM_READ, &tm);
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close(rtc);
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close(rtc);
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return 0;
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/* Convert RTC from UTC to local time zone.. */
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#else
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sec = (tm.tm_min * 60) + (tm.tm_hour * 3600) - timezone;
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(void)tm;
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return -1;
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/* Handle wrapping and negative offsets */
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#endif
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*h = (sec / 3600);
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sec -= *h * 3600;
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*m = sec / 60;
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while (*m < 0) {
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*m = *m + 60;
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*h = *h - 1;
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}
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while (*m > 59) {
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*m = *m - 60;
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*h = *h + 1;
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}
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while (*h < 0) {
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*h = *h + 24;
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}
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while (*h > 23) {
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*h = *h - 24;
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}
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}
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}
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void rtc_enable_alarm(bool enable)
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{
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int rtc = open("/dev/rtc0", O_WRONLY);
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if (rtc < 0)
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return;
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ioctl(rtc, enable ? RTC_AIE_ON : RTC_AIE_OFF, NULL);
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close(rtc);
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/* XXX Note that this may or may not work; Linux may need to be suspended
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or shut down in a special way to keep the RTC alarm active */
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}
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/* Returns true if alarm was the reason we started up */
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bool rtc_check_alarm_started(bool release_alarm)
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{
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int rtc = open("/dev/rtc0", O_WRONLY);
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if (rtc < 0)
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return false;
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/* XXX There is no generic way of determining wakeup reason. Will
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likely need a target-specific hook. */
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/* Disable alarm if requested */
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if (release_alarm)
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ioctl(rtc, RTC_AIE_OFF, NULL);
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close(rtc);
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return false;
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}
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/* See if we received an alarm. */
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bool rtc_check_alarm_flag(void)
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{
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struct rtc_wkalrm alrm;
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int rtc = open("/dev/rtc0", O_WRONLY);
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if (rtc < 0)
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return false;
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alrm.pending = 0;
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/* XXX Documented as "mostly useless on Linux" except with EFI RTCs
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Will likely need a target-specific hook. */
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ioctl(rtc, RTC_WKALM_RD, &alrm);
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close(rtc);
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return alrm.pending;
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}
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#endif /* HAVE_RTC_ALARM */
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