headers: remove sched.h from interrupt.h

[safe/jmp/linux-2.6] / drivers / rtc / class.c

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index d58d74c..be5a6b7 100644 (file)
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -32,6 +32,75 @@ static void rtc_device_release(struct device *dev)
        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
@@ -80,9 +149,12 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
        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)
@@ -93,7 +165,7 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
        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;
 
@@ -143,6 +215,8 @@ static int __init rtc_init(void)
                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;