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clocksource: acpi_pm: Add external callback for suspend/resume

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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>
This commit is contained in:
Marek Maslanka 2024-08-12 18:41:42 +00:00 committed by Daniel Lezcano
parent a7456d7d1b
commit 56bd72e9cd
2 changed files with 45 additions and 0 deletions
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32
drivers/clocksource/acpi_pm.c
View File

@ -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,
};

13
include/linux/acpi_pmtmr.h
View File

@ -26,6 +26,19 @@ static inline u32 acpi_pm_read_early(void)
return acpi_pm_read_verified() & ACPI_PM_MASK;
}
/**
* Register callback for suspend and resume event
*
* @cb Callback triggered on suspend and resume
* @data Data passed with the callback
*/
void acpi_pmtmr_register_suspend_resume_callback(void (*cb)(void *data, bool suspend), void *data);
/**
* Remove registered callback for suspend and resume event
*/
void acpi_pmtmr_unregister_suspend_resume_callback(void);
#else
static inline u32 acpi_pm_read_early(void)