[PATCH v5 4/4] platform/x86: bitland-mifs-wmi: Cycle the platform profile on Fn+K

[Chris Taraszka <chris@miget.com>]

On the Xiaomi Book Pro 14 (TM2424), Fn+K sends hotkey event 0x28 and
the firmware does not change SystemPerMode itself. The event is a
request that the vendor software acts on; without that software Fn+K
does nothing on Windows either, and on Linux it is currently logged as
an unknown event.

Call platform_profile_cycle() from the control device when the event
arrives, so Fn+K cycles through the profiles that all platform profile
handlers support. 0x28 is not used for anything else, so no quirk is
needed.

Suggested-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Chris Taraszka <chris@miget.com>
---

Notes:
    v5: cycle on 0x28 for every model, without the quirk flag (Mingyou).
    
    Retested on v7.4-rc1, on battery: three Fn+K presses from low-power
    set 0x09, 0x03 and 0x02, each followed by a single 0x16 from the
    firmware.

 drivers/platform/x86/bitland-mifs-wmi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index c25b4e4c9b3c..d8341683819e 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -169,6 +169,7 @@ enum bitland_mifs_event_id {
 	WMI_EVENT_MIC_MUTE		= 33,
 	WMI_EVENT_RESERVED_23		= 34,
 	WMI_EVENT_OPEN_APP		= 35,
+	WMI_EVENT_PERFORMANCE_CYCLE	= 40,
 };
 
 enum bitland_mifs_event_type {
@@ -217,6 +218,7 @@ static BLOCKING_NOTIFIER_HEAD(bitland_notifier_list);
 enum bitland_notifier_actions {
 	BITLAND_NOTIFY_KBD_BRIGHTNESS,
 	BITLAND_NOTIFY_PLATFORM_PROFILE,
+	BITLAND_NOTIFY_PLATFORM_PROFILE_CYCLE,
 	BITLAND_NOTIFY_HWMON,
 };
 
@@ -869,6 +871,10 @@ static int bitland_notifier_callback(struct notifier_block *nb,
 	case BITLAND_NOTIFY_PLATFORM_PROFILE:
 		platform_profile_notify(data_ctx->pp_dev);
 		break;
+	case BITLAND_NOTIFY_PLATFORM_PROFILE_CYCLE:
+		if (data_ctx->pp_dev)
+			platform_profile_cycle();
+		break;
 	case BITLAND_NOTIFY_HWMON:
 		fan_info = data;
 
@@ -1043,6 +1049,12 @@ static void bitland_mifs_wmi_notify(struct wmi_device *wdev,
 					     NULL);
 		return;
 
+	case WMI_EVENT_PERFORMANCE_CYCLE:
+		blocking_notifier_call_chain(&bitland_notifier_list,
+					     BITLAND_NOTIFY_PLATFORM_PROFILE_CYCLE,
+					     NULL);
+		return;
+
 	/*
 	 * The device has 3 fans (CPU, GPU, SYS),
 	 * but there are only the CPU and GPU fan has events
-- 
2.56.0