[PATCH v3 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.

Add a quirk for this and 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. Models without the quirk keep
ignoring the event.

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

Notes:
    Sent on its own earlier today [1]. It is now part of the series since
    it changes the TM2424 quirks entry from patch 1. Retested with v3: three
    Fn+K presses from balanced step performance (0x04) -> low-power (0x02)
    -> balanced (0x09).
    
    [1] https://lore.kernel.org/all/20261101144100.1043263-1-chris@miget.com/

 drivers/platform/x86/bitland-mifs-wmi.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index 4d02cd9e8a6b..84d1223d0ec6 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -100,6 +100,9 @@ struct bitland_mifs_quirks {
 
 	bool return_code_at_end;
 	bool skip_ac_type_check;
+
+	/* Fn+K sends WMI_EVENT_PERFORMANCE_CYCLE and leaves the mode to the OS */
+	bool cycle_profile_on_key;
 };
 
 static const struct bitland_profile_entry default_profile_entries[] = {
@@ -126,6 +129,7 @@ static const struct bitland_mifs_quirks tm2424_quirks = {
 	.profile_entries = tm2424_profile_entries,
 	.num_profile_entries = ARRAY_SIZE(tm2424_profile_entries),
 	.skip_ac_type_check = true,
+	.cycle_profile_on_key = true,
 };
 
 static const struct dmi_system_id bitland_mifs_dmi_table[] = {
@@ -169,6 +173,7 @@ 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 +222,7 @@ 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 +875,10 @@ 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;
 
@@ -1015,6 +1025,7 @@ static void bitland_mifs_wmi_report_key(struct wmi_device *wdev, u32 payload)
 static void bitland_mifs_wmi_notify(struct wmi_device *wdev,
 				    const struct wmi_buffer *buffer)
 {
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(&wdev->dev);
 	const struct bitland_mifs_event *event = buffer->data;
 	struct bitland_fan_notify_data fan_data;
 	u8 brightness;
@@ -1043,6 +1054,15 @@ static void bitland_mifs_wmi_notify(struct wmi_device *wdev,
 					     NULL);
 		return;
 
+	case WMI_EVENT_PERFORMANCE_CYCLE:
+		if (!data->quirks->cycle_profile_on_key)
+			break;
+
+		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