Commit 101ca8d0 authored by Shanker Donthineni's avatar Shanker Donthineni Committed by Alexandre Belloni

rtc: efi: Enable SET/GET WAKEUP services as optional

The current implementation of rtc-efi is expecting all the 4
time services GET{SET}_TIME{WAKEUP} must be supported by UEFI
firmware. As per the EFI_RT_PROPERTIES_TABLE, the platform
specific implementations can choose to enable selective time
services based on the RTC device capabilities.

This patch does the following changes to provide GET/SET RTC
services on platforms that do not support the WAKEUP feature.

1) Relax time services cap check when creating a platform device.
2) Clear RTC_FEATURE_ALARM bit in the absence of WAKEUP services.
3) Conditional alarm entries in '/proc/driver/rtc'.

Cc: <stable@vger.kernel.org> # v6.0+
Signed-off-by: default avatarShanker Donthineni <sdonthineni@nvidia.com>
Link: https://lore.kernel.org/r/20230102230630.192911-1-sdonthineni@nvidia.comSigned-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 1b929c02
......@@ -188,9 +188,10 @@ 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_cap_t cap;
efi_bool_t enabled, pending;
efi_time_t eft, alm;
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));
......@@ -213,23 +214,25 @@ 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);
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 (eft.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);
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 (eft.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
......@@ -269,7 +272,10 @@ static int __init efi_rtc_probe(struct platform_device *dev)
rtc->ops = &efi_rtc_ops;
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
set_bit(RTC_FEATURE_ALARM_WAKEUP_ONLY, 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);
device_init_wakeup(&dev->dev, true);
......
......@@ -668,7 +668,8 @@ extern struct efi {
#define EFI_RT_SUPPORTED_ALL 0x3fff
#define EFI_RT_SUPPORTED_TIME_SERVICES 0x000f
#define EFI_RT_SUPPORTED_TIME_SERVICES 0x0003
#define EFI_RT_SUPPORTED_WAKEUP_SERVICES 0x000c
#define EFI_RT_SUPPORTED_VARIABLE_SERVICES 0x0070
extern struct mm_struct efi_mm;
......
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