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@xxxxxxxxxx> --- Changes in v5: - Rename acpi_pm_register_suspend_resume_callback to acpi_pmtmr_register_suspend_resume_callback and move prototype to include/linux/acpi_pmtmr.h - Remove the acpi_pm.h header added in the previous patch. - Link to v4: https://lore.kernel.org/lkml/20240809131343.1173369-1-mmaslanka@xxxxxxxxxx/ --- --- drivers/clocksource/acpi_pm.c | 24 ++++++++++++++++++++++++ include/linux/acpi_pmtmr.h | 8 ++++++++ 2 files changed, 32 insertions(+) diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c index 82338773602ca..fab19b7de55c1 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 +62,24 @@ 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; +} + +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 +91,8 @@ 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, }; diff --git a/include/linux/acpi_pmtmr.h b/include/linux/acpi_pmtmr.h index 50d88bf1498d7..a5262d28b97e0 100644 --- a/include/linux/acpi_pmtmr.h +++ b/include/linux/acpi_pmtmr.h @@ -26,6 +26,14 @@ 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); + #else static inline u32 acpi_pm_read_early(void) -- 2.46.0.76.ge559c4bf1a-goog
