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authorMarek Maslanka <mmaslanka@google.com>2024-08-12 20:41:42 +0200
committerDaniel Lezcano <daniel.lezcano@linaro.org>2024-09-06 14:49:20 +0200
commit56bd72e9cd8272687aa2a8eccddabc5526cd7845 (patch)
tree20c684f236990082cf74e1036a50e2a317714272 /drivers
parentclocksource/drivers/arm_arch_timer: Using for_each_available_child_of_node_sc... (diff)
downloadlinux-56bd72e9cd8272687aa2a8eccddabc5526cd7845.tar.xz
linux-56bd72e9cd8272687aa2a8eccddabc5526cd7845.zip
clocksource: acpi_pm: Add external callback for suspend/resume
Provides the capability to register an external callback for the ACPI PM timer, which is called during the suspend and resume processes. Signed-off-by: Marek Maslanka <mmaslanka@google.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20240812184150.1079924-1-mmaslanka@google.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clocksource/acpi_pm.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 82338773602c..b4330a01a566 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -25,6 +25,10 @@
#include <asm/io.h>
#include <asm/time.h>
+static void *suspend_resume_cb_data;
+
+static void (*suspend_resume_callback)(void *data, bool suspend);
+
/*
* The I/O port the PMTMR resides at.
* The location is detected during setup_arch(),
@@ -58,6 +62,32 @@ u32 acpi_pm_read_verified(void)
return v2;
}
+void acpi_pmtmr_register_suspend_resume_callback(void (*cb)(void *data, bool suspend), void *data)
+{
+ suspend_resume_callback = cb;
+ suspend_resume_cb_data = data;
+}
+EXPORT_SYMBOL_GPL(acpi_pmtmr_register_suspend_resume_callback);
+
+void acpi_pmtmr_unregister_suspend_resume_callback(void)
+{
+ suspend_resume_callback = NULL;
+ suspend_resume_cb_data = NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_pmtmr_unregister_suspend_resume_callback);
+
+static void acpi_pm_suspend(struct clocksource *cs)
+{
+ if (suspend_resume_callback)
+ suspend_resume_callback(suspend_resume_cb_data, true);
+}
+
+static void acpi_pm_resume(struct clocksource *cs)
+{
+ if (suspend_resume_callback)
+ suspend_resume_callback(suspend_resume_cb_data, false);
+}
+
static u64 acpi_pm_read(struct clocksource *cs)
{
return (u64)read_pmtmr();
@@ -69,6 +99,8 @@ static struct clocksource clocksource_acpi_pm = {
.read = acpi_pm_read,
.mask = (u64)ACPI_PM_MASK,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .suspend = acpi_pm_suspend,
+ .resume = acpi_pm_resume,
};