#include <linux/rtc.h>
#include <linux/kdev_t.h>
#include <linux/idr.h>
+#include <linux/slab.h>
#include "rtc-core.h"
kfree(rtc);
}
+#if defined(CONFIG_PM) && defined(CONFIG_RTC_HCTOSYS_DEVICE)
+
+/*
+ * On suspend(), measure the delta between one RTC and the
+ * system's wall clock; restore it on resume().
+ */
+
+static struct timespec delta;
+static time_t oldtime;
+
+static int rtc_suspend(struct device *dev, pm_message_t mesg)
+{
+ struct rtc_device *rtc = to_rtc_device(dev);
+ struct rtc_time tm;
+ struct timespec ts = current_kernel_time();
+
+ if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
+ return 0;
+
+ rtc_read_time(rtc, &tm);
+ rtc_tm_to_time(&tm, &oldtime);
+
+ /* RTC precision is 1 second; adjust delta for avg 1/2 sec err */
+ set_normalized_timespec(&delta,
+ ts.tv_sec - oldtime,
+ ts.tv_nsec - (NSEC_PER_SEC >> 1));
+
+ return 0;
+}
+
+static int rtc_resume(struct device *dev)
+{
+ struct rtc_device *rtc = to_rtc_device(dev);
+ struct rtc_time tm;
+ time_t newtime;
+ struct timespec time;
+
+ if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
+ return 0;
+
+ rtc_read_time(rtc, &tm);
+ if (rtc_valid_tm(&tm) != 0) {
+ pr_debug("%s: bogus resume time\n", dev_name(&rtc->dev));
+ return 0;
+ }
+ rtc_tm_to_time(&tm, &newtime);
+ if (newtime <= oldtime) {
+ if (newtime < oldtime)
+ pr_debug("%s: time travel!\n", dev_name(&rtc->dev));
+ return 0;
+ }
+
+ /* restore wall clock using delta against this RTC;
+ * adjust again for avg 1/2 second RTC sampling error
+ */
+ set_normalized_timespec(&time,
+ newtime + delta.tv_sec,
+ (NSEC_PER_SEC >> 1) + delta.tv_nsec);
+ do_settimeofday(&time);
+
+ return 0;
+}
+
+#else
+#define rtc_suspend NULL
+#define rtc_resume NULL
+#endif
+
+
/**
* rtc_device_register - register w/ RTC class
* @dev: the device to register
mutex_init(&rtc->ops_lock);
spin_lock_init(&rtc->irq_lock);
spin_lock_init(&rtc->irq_task_lock);
+ init_waitqueue_head(&rtc->irq_queue);
strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
- snprintf(rtc->dev.bus_id, BUS_ID_SIZE, "rtc%d", id);
+ dev_set_name(&rtc->dev, "rtc%d", id);
+
+ rtc_dev_prepare(rtc);
err = device_register(&rtc->dev);
if (err)
rtc_proc_add_device(rtc);
dev_info(dev, "rtc core: registered %s as %s\n",
- rtc->name, rtc->dev.bus_id);
+ rtc->name, dev_name(&rtc->dev));
return rtc;
printk(KERN_ERR "%s: couldn't create class\n", __FILE__);
return PTR_ERR(rtc_class);
}
+ rtc_class->suspend = rtc_suspend;
+ rtc_class->resume = rtc_resume;
rtc_dev_init();
rtc_sysfs_init(rtc_class);
return 0;
{
rtc_dev_exit();
class_destroy(rtc_class);
+ idr_destroy(&rtc_idr);
}
subsys_initcall(rtc_init);