[RFC PATCH 1/3] efi-rtc: Remove wakeup functionality

[Ard Biesheuvel <ardb+git@xxxxxxxxxx>]

From: Ard Biesheuvel <ardb@xxxxxxxxxx>

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 <ardb@xxxxxxxxxx>
---
 drivers/rtc/rtc-efi.c | 76 +-------------------
 1 file changed, 2 insertions(+), 74 deletions(-)

diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
index fa8bf82df948..b4f44999ef0f 100644
--- a/drivers/rtc/rtc-efi.c
+++ b/drivers/rtc/rtc-efi.c
@@ -112,48 +112,6 @@ convert_from_efi_time(efi_time_t *eft, struct rtc_time 
*wtime)
        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;
@@ -188,17 +146,13 @@ static int efi_set_time(struct device *dev, struct 
rtc_time *tm)
 
 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"
@@ -214,26 +168,6 @@ static int efi_procfs(struct device *dev, struct seq_file 
*seq)
                /* 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
         */
@@ -249,8 +183,6 @@ static int efi_procfs(struct device *dev, struct seq_file 
*seq)
 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,
 };
 
@@ -271,11 +203,7 @@ static int __init efi_rtc_probe(struct platform_device 
*dev)
        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);
 
-- 
2.50.0.727.gbf7dc18ff4-goog