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Signed-off-by: Marek Maslanka Reviewed-by: Hans de Goede --- Changes in v6: - Add the acpi_pmtmr_unregister_suspend_resume_callback function to remove callback - Add EXPORT_SYMBOL_GPL to the added functions - Link to v5: https://lore.kernel.org/lkml/20240812043741.3434744-1-mmaslanka@google.com/ --- --- drivers/clocksource/acpi_pm.c | 32 ++++++++++++++++++++++++++++++++ include/linux/acpi_pmtmr.h | 13 +++++++++++++ 2 files changed, 45 insertions(+) diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c index 82338773602ca..b4330a01a566b 100644 --- a/drivers/clocksource/acpi_pm.c +++ b/drivers/clocksource/acpi_pm.c @@ -25,6 +25,10 @@ #include #include +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, }; diff --git a/include/linux/acpi_pmtmr.h b/include/linux/acpi_pmtmr.h index 50d88bf1498d7..0ded9220d379c 100644 --- a/include/linux/acpi_pmtmr.h +++ b/include/linux/acpi_pmtmr.h @@ -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)