2023-03-11 23:01:01 +00:00
|
|
|
From b10a20076d62163b8e25467eb2bf1f553f040797 Mon Sep 17 00:00:00 2001
|
2023-02-24 23:34:52 +00:00
|
|
|
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 | 35 ++++++++++++++++++++++++-----------
|
|
|
|
1 file changed, 24 insertions(+), 11 deletions(-)
|
|
|
|
|
|
|
|
diff --git a/drivers/acpi/acpi_tad.c b/drivers/acpi/acpi_tad.c
|
|
|
|
index e9b8e8305e23..944276934e7e 100644
|
|
|
|
--- a/drivers/acpi/acpi_tad.c
|
|
|
|
+++ b/drivers/acpi/acpi_tad.c
|
|
|
|
@@ -432,6 +432,14 @@ 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)
|
|
|
|
{
|
|
|
|
@@ -480,15 +488,14 @@ 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,
|
|
|
|
@@ -563,13 +570,18 @@ static int 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);
|
|
|
|
@@ -604,11 +616,6 @@ static int acpi_tad_probe(struct platform_device *pdev)
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
- if (!acpi_has_method(handle, "_PRW")) {
|
|
|
|
- dev_info(dev, "Missing _PRW\n");
|
|
|
|
- return -ENODEV;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
|
|
|
|
if (!dd)
|
|
|
|
return -ENOMEM;
|
|
|
|
@@ -637,6 +644,12 @@ 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)
|
|
|
|
--
|
|
|
|
2.39.2
|
|
|
|
|