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From 0a6b868f61d7564bc898ac30c84fbf3c34fb7368 Mon Sep 17 00:00:00 2001
From: "Bart Groeneveld | GPX Solutions B.V" <bart@gpxbv.nl>
Date: Mon, 5 Dec 2022 16:08:46 +0100
Subject: [PATCH] acpi: allow usage of acpi_tad on HW-reduced platforms
The specification [1] allows so-called HW-reduced platforms,
which do not implement everything, especially the wakeup related stuff.
In that case, it is still usable as a RTC. This is helpful for [2]
and [3], which is about a device with no other working RTC,
but it does have an HW-reduced TAD, which can be used as a RTC instead.
[1]: https://uefi.org/specs/ACPI/6.5/09_ACPI_Defined_Devices_and_Device_Specific_Objects.html#time-and-alarm-device
[2]: https://bugzilla.kernel.org/show_bug.cgi?id=212313
[3]: https://github.com/linux-surface/linux-surface/issues/415
Signed-off-by: Bart Groeneveld | GPX Solutions B.V. <bart@gpxbv.nl>
Patchset: rtc
---
drivers/acpi/acpi_tad.c | 36 ++++++++++++++++++++++++------------
1 file changed, 24 insertions(+), 12 deletions(-)
diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
index b831cb8e53dc..78bd0f926505 100644
--- a/drivers/acpi/acpi_tad.c
+++ b/drivers/acpi/acpi_tad.c
@@ -433,6 +433,14 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR_RO(caps);
+static struct attribute *acpi_tad_attrs[] = {
+ &dev_attr_caps.attr,
+ NULL,
+};
+static const struct attribute_group acpi_tad_attr_group = {
+ .attrs = acpi_tad_attrs,
+};
+
static ssize_t ac_alarm_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@@ -481,15 +489,14 @@ static ssize_t ac_status_show(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR_RW(ac_status);
-static struct attribute *acpi_tad_attrs[] = {
- &dev_attr_caps.attr,
+static struct attribute *acpi_tad_ac_attrs[] = {
&dev_attr_ac_alarm.attr,
&dev_attr_ac_policy.attr,
&dev_attr_ac_status.attr,
NULL,
};
-static const struct attribute_group acpi_tad_attr_group = {
- .attrs = acpi_tad_attrs,
+static const struct attribute_group acpi_tad_ac_attr_group = {
+ .attrs = acpi_tad_ac_attrs,
};
static ssize_t dc_alarm_store(struct device *dev, struct device_attribute *attr,
@@ -565,13 +572,18 @@ static void acpi_tad_remove(struct platform_device *pdev)
pm_runtime_get_sync(dev);
+ if (dd->capabilities & ACPI_TAD_AC_WAKE)
+ sysfs_remove_group(&dev->kobj, &acpi_tad_ac_attr_group);
+
if (dd->capabilities & ACPI_TAD_DC_WAKE)
sysfs_remove_group(&dev->kobj, &acpi_tad_dc_attr_group);
sysfs_remove_group(&dev->kobj, &acpi_tad_attr_group);
- acpi_tad_disable_timer(dev, ACPI_TAD_AC_TIMER);
- acpi_tad_clear_status(dev, ACPI_TAD_AC_TIMER);
+ if (dd->capabilities & ACPI_TAD_AC_WAKE) {
+ acpi_tad_disable_timer(dev, ACPI_TAD_AC_TIMER);
+ acpi_tad_clear_status(dev, ACPI_TAD_AC_TIMER);
+ }
if (dd->capabilities & ACPI_TAD_DC_WAKE) {
acpi_tad_disable_timer(dev, ACPI_TAD_DC_TIMER);
acpi_tad_clear_status(dev, ACPI_TAD_DC_TIMER);
@@ -613,12 +625,6 @@ static int acpi_tad_probe(struct platform_device *pdev)
goto remove_handler;
}
- if (!acpi_has_method(handle, "_PRW")) {
- dev_info(dev, "Missing _PRW\n");
- ret = -ENODEV;
- goto remove_handler;
- }
-
dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
if (!dd) {
ret = -ENOMEM;
@@ -649,6 +655,12 @@ static int acpi_tad_probe(struct platform_device *pdev)
if (ret)
goto fail;
+ if (caps & ACPI_TAD_AC_WAKE) {
+ ret = sysfs_create_group(&dev->kobj, &acpi_tad_ac_attr_group);
+ if (ret)
+ goto fail;
+ }
+
if (caps & ACPI_TAD_DC_WAKE) {
ret = sysfs_create_group(&dev->kobj, &acpi_tad_dc_attr_group);
if (ret)
--
2.47.1
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