Merge tag 'for-f2fs-4.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk...

[linux-beck.git] / drivers / rtc / rtc-cmos.c

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index e8f3a212d09ad58fd7326a1a3de73b58d9adf3dd..dd3d59806ffa02ef955660390533881d9f6cee62 100644 (file)
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -62,6 +62,8 @@ struct cmos_rtc {
        u8                      day_alrm;
        u8                      mon_alrm;
        u8                      century;
+
+       struct rtc_wkalrm       saved_wkalrm;
 };
 
 /* both platform and pnp busses use negative numbers for invalid irqs */
@@ -846,8 +848,6 @@ static int cmos_aie_poweroff(struct device *dev)
        return retval;
 }
 
-#ifdef CONFIG_PM
-
 static int cmos_suspend(struct device *dev)
 {
        struct cmos_rtc *cmos = dev_get_drvdata(dev);
@@ -879,6 +879,8 @@ static int cmos_suspend(struct device *dev)
                        enable_irq_wake(cmos->irq);
        }
 
+       cmos_read_alarm(dev, &cmos->saved_wkalrm);
+
        dev_dbg(dev, "suspend%s, ctrl %02x\n",
                        (tmp & RTC_AIE) ? ", alarm may wake" : "",
                        tmp);
@@ -894,15 +896,32 @@ static int cmos_suspend(struct device *dev)
  */
 static inline int cmos_poweroff(struct device *dev)
 {
+       if (!IS_ENABLED(CONFIG_PM))
+               return -ENOSYS;
+
        return cmos_suspend(dev);
 }
 
-#ifdef CONFIG_PM_SLEEP
+static void cmos_check_wkalrm(struct device *dev)
+{
+       struct cmos_rtc *cmos = dev_get_drvdata(dev);
+       struct rtc_wkalrm current_alarm;
+       time64_t t_current_expires;
+       time64_t t_saved_expires;
+
+       cmos_read_alarm(dev, &current_alarm);
+       t_current_expires = rtc_tm_to_time64(&current_alarm.time);
+       t_saved_expires = rtc_tm_to_time64(&cmos->saved_wkalrm.time);
+       if (t_current_expires != t_saved_expires ||
+           cmos->saved_wkalrm.enabled != current_alarm.enabled) {
+               cmos_set_alarm(dev, &cmos->saved_wkalrm);
+       }
+}
 
 static void cmos_check_acpi_rtc_status(struct device *dev,
                                       unsigned char *rtc_control);
 
-static int cmos_resume(struct device *dev)
+static int __maybe_unused cmos_resume(struct device *dev)
 {
        struct cmos_rtc *cmos = dev_get_drvdata(dev);
        unsigned char tmp;
@@ -915,6 +934,9 @@ static int cmos_resume(struct device *dev)
                cmos->enabled_wake = 0;
        }
 
+       /* The BIOS might have changed the alarm, restore it */
+       cmos_check_wkalrm(dev);
+
        spin_lock_irq(&rtc_lock);
        tmp = cmos->suspend_ctrl;
        cmos->suspend_ctrl = 0;
@@ -952,16 +974,6 @@ static int cmos_resume(struct device *dev)
        return 0;
 }
 
-#endif
-#else
-
-static inline int cmos_poweroff(struct device *dev)
-{
-       return -ENOSYS;
-}
-
-#endif
-
 static SIMPLE_DEV_PM_OPS(cmos_pm_ops, cmos_suspend, cmos_resume);
 
 /*----------------------------------------------------------------*/
@@ -1255,9 +1267,7 @@ static struct platform_driver cmos_platform_driver = {
        .shutdown       = cmos_platform_shutdown,
        .driver = {
                .name           = driver_name,
-#ifdef CONFIG_PM
                .pm             = &cmos_pm_ops,
-#endif
                .of_match_table = of_match_ptr(of_cmos_match),
        }
 };