ACPI: bus: Indicate support for battery charge limiting thru _OSC

The ACPI battery driver can handle the "charge limiting" state
of the battery, so the platform can advertise this state.

Indicate this by setting bit 19 ("Battery Charge Limiting Support")
when evaluating _OSC.

Tested on a Lenovo Ideapad S145-14IWL.

Signed-off-by: Armin Wolf <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: Wer-Wolf

drivers/acpi/bus.c

@@ -329,6 +329,8 @@ static void acpi_bus_osc_negotiate_platform_control(void)
 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 	if (IS_ENABLED(CONFIG_ACPI_THERMAL))
 		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
+	if (IS_ENABLED(CONFIG_ACPI_BATTERY))
+		capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT;
 
 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 	capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;

include/linux/acpi.h

@@ -576,6 +576,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
 #define OSC_SB_CPC_FLEXIBLE_ADR_SPACE		0x00004000
 #define OSC_SB_GENERIC_INITIATOR_SUPPORT	0x00020000
 #define OSC_SB_NATIVE_USB4_SUPPORT		0x00040000
+#define OSC_SB_BATTERY_CHARGE_LIMITING_SUPPORT	0x00080000
 #define OSC_SB_PRM_SUPPORT			0x00200000
 #define OSC_SB_FFH_OPR_SUPPORT			0x00400000