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 v4: - No changes as this was introduced as a separated patch after the v3 review. - Link to v3: https://lore.kernel.org/lkml/20240730120546.1042515-1-mmaslanka@xxxxxxxxxx/ --- --- drivers/clocksource/acpi_pm.c | 27 +++++++++++++++++++++++++++ drivers/clocksource/acpi_pm.h | 16 ++++++++++++++++ 2 files changed, 43 insertions(+) create mode 100644 drivers/clocksource/acpi_pm.h diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c index 82338773602ca..c629f5462bc0f 100644 --- a/drivers/clocksource/acpi_pm.c +++ b/drivers/clocksource/acpi_pm.c @@ -25,6 +25,12 @@ #include <asm/io.h> #include <asm/time.h> +#include "acpi_pm.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 +64,25 @@ u32 acpi_pm_read_verified(void) return v2; } +void acpi_pm_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 +94,8 @@ 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/drivers/clocksource/acpi_pm.h b/drivers/clocksource/acpi_pm.h new file mode 100644 index 0000000000000..c932899f04282 --- /dev/null +++ b/drivers/clocksource/acpi_pm.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ACPI_PM_H__ +#define __ACPI_PM_H__ + +#include <linux/types.h> + +/** + * Register callback for suspend and resume event + * + * @cb Callback triggered on suspend and resume + * @data Data passed with the callback + */ +void acpi_pm_register_suspend_resume_callback(void (*cb)(void *data, bool suspend), + void *data); + +#endif -- 2.46.0.76.ge559c4bf1a-goog
