rtc: efi: Remove wakeup functionality

The EFI rtc driver is used by non-x86 architectures only, and exposes
the get/set wakeup time functionality provided by the underlying
platform. This is usually broken on most platforms, and not widely used
to begin with [if at all], so let's just remove it.

Signed-off-by: Ard Biesheuvel <[e-mail]>
Tested-by: Feng Tang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-efi.c

···
 	return true;
 }
 
-static int efi_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
-{
-	efi_time_t eft;
-	efi_status_t status;
-
-	/*
-	 * As of EFI v1.10, this call always returns an unsupported status
-	 */
-	status = efi.get_wakeup_time((efi_bool_t *)&wkalrm->enabled,
-				     (efi_bool_t *)&wkalrm->pending, &eft);
-
-	if (status != EFI_SUCCESS)
-		return -EINVAL;
-
-	if (!convert_from_efi_time(&eft, &wkalrm->time))
-		return -EIO;
-
-	return rtc_valid_tm(&wkalrm->time);
-}
-
-static int efi_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
-{
-	efi_time_t eft;
-	efi_status_t status;
-
-	convert_to_efi_time(&wkalrm->time, &eft);
-
-	/*
-	 * XXX Fixme:
-	 * As of EFI 0.92 with the firmware I have on my
-	 * machine this call does not seem to work quite
-	 * right
-	 *
-	 * As of v1.10, this call always returns an unsupported status
-	 */
-	status = efi.set_wakeup_time((efi_bool_t)wkalrm->enabled, &eft);
-
-	dev_warn(dev, "write status is %d\n", (int)status);
-
-	return status == EFI_SUCCESS ? 0 : -EINVAL;
-}
-
 static int efi_read_time(struct device *dev, struct rtc_time *tm)
 {
 	efi_status_t status;
···
 
 static int efi_procfs(struct device *dev, struct seq_file *seq)
 {
-	efi_time_t        eft, alm;
+	efi_time_t        eft;
 	efi_time_cap_t    cap;
-	efi_bool_t        enabled, pending;
-	struct rtc_device *rtc = dev_get_drvdata(dev);
 
 	memset(&eft, 0, sizeof(eft));
-	memset(&alm, 0, sizeof(alm));
 	memset(&cap, 0, sizeof(cap));
 
 	efi.get_time(&eft, &cap);
-	efi.get_wakeup_time(&enabled, &pending, &alm);
 
 	seq_printf(seq,
 		   "Time\t\t: %u:%u:%u.%09u\n"
···
 	else
 		/* XXX fixme: convert to string? */
 		seq_printf(seq, "Timezone\t: %u\n", eft.timezone);
-
-	if (test_bit(RTC_FEATURE_ALARM, rtc->features)) {
-		seq_printf(seq,
-			   "Alarm Time\t: %u:%u:%u.%09u\n"
-			   "Alarm Date\t: %u-%u-%u\n"
-			   "Alarm Daylight\t: %u\n"
-			   "Enabled\t\t: %s\n"
-			   "Pending\t\t: %s\n",
-			   alm.hour, alm.minute, alm.second, alm.nanosecond,
-			   alm.year, alm.month, alm.day,
-			   alm.daylight,
-			   enabled == 1 ? "yes" : "no",
-			   pending == 1 ? "yes" : "no");
-
-		if (alm.timezone == EFI_UNSPECIFIED_TIMEZONE)
-			seq_puts(seq, "Timezone\t: unspecified\n");
-		else
-			/* XXX fixme: convert to string? */
-			seq_printf(seq, "Timezone\t: %u\n", alm.timezone);
-	}
 
 	/*
 	 * now prints the capabilities
···
 static const struct rtc_class_ops efi_rtc_ops = {
 	.read_time	= efi_read_time,
 	.set_time	= efi_set_time,
-	.read_alarm	= efi_read_alarm,
-	.set_alarm	= efi_set_alarm,
 	.proc		= efi_procfs,
 };
 
···
 	platform_set_drvdata(dev, rtc);
 
 	rtc->ops = &efi_rtc_ops;
-	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
-	if (efi_rt_services_supported(EFI_RT_SUPPORTED_WAKEUP_SERVICES))
-		set_bit(RTC_FEATURE_ALARM_WAKEUP_ONLY, rtc->features);
-	else
-		clear_bit(RTC_FEATURE_ALARM, rtc->features);
+	clear_bit(RTC_FEATURE_ALARM, rtc->features);
 
 	device_init_wakeup(&dev->dev, true);