[PATCH v13 0/7] Merge redmi-wmi into bitland-mifs-wmi

[PATCH v13 0/7] Merge redmi-wmi into bitland-mifs-wmi

[Mingyou Chen]

This patch series consolidates the standalone 'redmi-wmi' driver into the
'bitland-mifs-wmi' driver to eliminate code duplication and centralize
the maintenance of overlapping ACPI WMI event streams.

Bitland is the ODM manufacturer for various Xiaomi Redmibook models. Both
platforms share the exact same keyboard event stream WMI GUID
(46C93E13-EE9B-4262-8488-563BCA757FEF). While redmi-wmi previously parsed
the 4-byte payload as a bulk u32 scancode, bitland-mifs-wmi deconstructed
it into discrete type/id/value fields.

Redmi operations were not contained in this patch series, future reverse
engineering is required.

This series introduce a newly reported mic-mute hotkey definition
for Redmibooks, dropped the previous redmi-wmi driver and intrudoced
the quirks table for the bitland-mifs-wmi driver.

I don't have a Redmi or other Bitland device. So I cannot work on the
real device.

Features are working properly on my device (Lecoo Bellator N176).

I leave the future reverse engineering work to the community.

Tests are welcome.

And by the way, the no_set member in bitland_profile_entry means a
platform profile is only report by the firmware but not available for
set.

Does accept_zero_function still necessary since the driver now permits
0x0 function field on SET operations?

And I've got a question, from sashiko's comment in my v12

https://sashiko.dev/#/patchset/20261012133648.132363-1-qby140326%40gmail.com

> Will this result in the loss of KEY_PERFORMANCE events on event-only legacy
> devices?
> Looking at bitland_mifs_wmi_probe() in drivers/platform/x86/bitland-mifs-wmi.c,
> if dev_type == BITLAND_WMI_EVENT, it returns early after registering the input
> device:
> 	if (dev_type == BITLAND_WMI_EVENT) {
> 		/* Register input device for hotkeys */
> 		drv_data->input_dev = devm_input_allocate_device(&wdev->dev);
> 		...
> 		return input_register_device(drv_data->input_dev);
> 	}
> When the performance key is pressed, bitland_mifs_wmi_notify() intercepts it,
> invokes the bitland_notifier_list, and returns without reporting an input event:
> 	case WMI_EVENT_PERFORMANCE_PLAN:
> 	case WMI_EVENT_PERFORMANCE_PLAN_ALT:
> 		blocking_notifier_call_chain(&bitland_notifier_list,
> 					     BITLAND_NOTIFY_PLATFORM_PROFILE,
> 					     NULL);
> 		return;
> Because the platform profile and notifier were not registered during probe
> for event-only devices, does this mean the events are silently dropped instead
> of emitting KEY_PERFORMANCE like the old driver did?

I ackknowledged that KEY_PERFORMANCE (WMI_EVENT_PERFORMANCE_PLAN_ALT in
bitland-mifs-wmi) looks like an event in this LKML thread

> Since the event reports a change that has already happened,
> platform_profile_notify() is the natural way to pass it on, as
> suggested in my v6 reply: power-profiles-daemon then re-reads the
> profile, which is harmless after the driver's own writes too. If
> KEY_PERFORMANCE should stay for on-screen displays (Ibragim asked to
> keep these events observable), it may be worth not reporting it for the
> event that echoes the driver's own write, or at least saying in a
> comment that it reports a mode change that already happened. On
> Ibragim's TM2209 the profile SET is reported not to work [3], so there
> 0x16 can only come from Fn+K and the echo does not exist; Ibragim, can
> you confirm?

https://lore.kernel.org/all/20261008152647.1510152-1-uselessfire@gmail.com/

So should I follow sashiko's advice?

v13:
Fix the zero function value problem find on my device
Fix the memcpy size issue
Remove WMI_EVENT_PERFORMANCE_PLAN_ALT in the keymap
Select BITLAND_MIFS_WMI and deprecate REDMI_WMI instead remove the
config entry

v12:
Fix the issues mentioned in https://lore.kernel.org/all/20261008152647.1510152-1-uselessfire@gmail.com/ .
Copy payload_data to output->data at bitland_mifs_wmi_call, not
overwrite the entire struct.
Correct the key name (Mic Mute) in the commit message of
"platform/x86: bitland-mifs-wmi: Add Redmi mic-mute key entries"
and my device doesn't have a FN-ESC key, so I renamed the enum variant to
WMI_EVENT_MIC_MUTE.

v11:
Add missing return_code_at_end and accept_zero_function logic
Fallback to balanced platform profile if resume to performance failed

v10:
Replace the previous "profile table" with dmi quirk table

v9:
Add the missing feature introduced in the commit
e0d6312578e1 ("platform/x86: redmi-wmi: report EC state change events").

v8:
Correct Ilya Gladyshev's email address in the MAINTAINERS entry

v7:
Swap low bit and high bit for WMI_EVENT_KBD_BRIGHTNESS
in bitland_mifs_wmi_keymap
0x00800501 -> BI_HOTKEY_CODE(WMI_EVENT_KBD_BRIGHTNESS, 0x80, 0),

Report KEY_FN_ESC when WMI_EVENT_FNLOCK_STATE events received
Rename the reserved names
Use Xmas tree order in bitland_mifs_wmi_notify
Collect the Tested-by and Reviewed-by tags

v6:
Drop the wrong Redmi ops

v5:
Correct Xiaomi DMI vendor name

v4:
Map PLATFORM_PROFILE_PERFORMANCE to wmi performance mode if the device
doesn't support full-speed mode.

Mingyou Chen (7):
  MAINTAINERS: Add maintainer entry of bitland-mifs-wmi driver
  platform/x86: bitland-mifs-wmi: Merge the function of redmi-wmi into
    the bitland driver
  platform/x86: bitland-mifs-wmi: Add Redmi mic-mute key entries
  platform/x86: redmi-wmi: Drop redmi-wmi driver
  platform/x86: bitland-mifs-wmi: Add quirks table
  platform/x86: bitland-mifs-wmi: Fallback to balanced platform profile
    if last performance profile is not available
  platform/x86: bitland-mifs-wmi: Permit zero on SET functions

 MAINTAINERS                             |   7 +-
 drivers/platform/x86/Kconfig            |  11 +-
 drivers/platform/x86/Makefile           |   1 -
 drivers/platform/x86/bitland-mifs-wmi.c | 357 +++++++++++++++++-------
 drivers/platform/x86/redmi-wmi.c        | 154 ----------
 5 files changed, 259 insertions(+), 271 deletions(-)
 delete mode 100644 drivers/platform/x86/redmi-wmi.c


base-commit: 893018d51f27ec0449155b0afe371aaf65380630
-- 
2.56.0

[PATCH v13 1/7] MAINTAINERS: Add maintainer entry of bitland-mifs-wmi driver

[Mingyou Chen]

Add a new maintainer entry for the bitland-mifs-wmi platform driver.

Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index cfce3571ac01..63d2fec54e86 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23043,6 +23043,13 @@ L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 F:	drivers/platform/x86/redmi-wmi.c
 
+BITLAND LAPTOP DRIVER
+M:	Mingyou Chen <qby140326@gmail.com>
+M:	Ilya Gladyshev <ilya.gladyshev@linux.dev>
+L:	platform-driver-x86@vger.kernel.org
+S:	Maintained
+F:	drivers/platform/x86/bitland-mifs-wmi.c
+
 REDPINE WIRELESS DRIVER
 L:	linux-wireless@vger.kernel.org
 S:	Orphan
-- 
2.56.0

[PATCH v13 2/7] platform/x86: bitland-mifs-wmi: Merge the function of redmi-wmi into the bitland driver

[Mingyou Chen]

The bitland-mifs-wmi and legacy redmi-wmi drivers both attempt to bind
to the same WMI GUID (46C93E13-EE9B-4262-8488-563BCA757FEF). This
overlap causes a device registration conflict, preventing one of the
drivers from loading properly depending on the module initialization
order.

Merge the event handling logic from redmi-wmi into bitland-mifs-wmi. By
handling both device layouts within a single driver, we eliminate the
GUID ownership conflict.

Tested-by: Nika Krasnova <nika@nikableh.moe>
Tested-by: Ilya Gladyshev <ilya.gladyshev@linux.dev>
Reviewed-by: Ilya Gladyshev <ilya.gladyshev@linux.dev>
Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 drivers/platform/x86/bitland-mifs-wmi.c | 153 ++++++++++++++++--------
 1 file changed, 106 insertions(+), 47 deletions(-)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index dd1648b7de77..9afa2e2764b0 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -35,6 +35,11 @@
 #include <linux/units.h>
 #include <linux/wmi.h>
 
+#define BI_HOTKEY_CODE(id, low, high) \
+	(((u32)(high) << 24) | ((u32)(low) << 16) | ((u32)(id) << 8) | WMI_EVENT_TYPE_HOTKEY)
+
+#define AI_KEY_VALUE_MASK    BIT(8)
+
 #define DRV_NAME		"bitland-mifs-wmi"
 #define BITLAND_MIFS_GUID	"B60BFB48-3E5B-49E4-A0E9-8CFFE1B3434B"
 #define BITLAND_EVENT_GUID	"46C93E13-EE9B-4262-8488-563BCA757FEF"
@@ -80,9 +85,9 @@ enum bitland_mifs_power_profile {
 };
 
 enum bitland_mifs_event_id {
-	WMI_EVENT_RESERVED_1		= 1,
-	WMI_EVENT_RESERVED_2		= 2,
-	WMI_EVENT_RESERVED_3		= 3,
+	WMI_EVENT_SWITCHVIDEOMODE	= 1,
+	WMI_EVENT_SELECTIVE_SCREENSHOT	= 2,
+	WMI_EVENT_ALL_APPLICATIONS	= 3,
 	WMI_EVENT_AIRPLANE_MODE		= 4,
 	WMI_EVENT_KBD_BRIGHTNESS	= 5,
 	WMI_EVENT_TOUCHPAD_STATE	= 6,
@@ -100,10 +105,11 @@ enum bitland_mifs_event_id {
 	WMI_EVENT_FN_1			= 19,
 	WMI_EVENT_FN_2			= 20,
 	WMI_EVENT_FN_3			= 21,
-	WMI_EVENT_FN_4			= 22,
+	WMI_EVENT_PERFORMANCE_PLAN_ALT	= 22,
 	WMI_EVENT_FN_5			= 24,
 	WMI_EVENT_REFRESH_RATE		= 25,
 	WMI_EVENT_CPU_FAN_SPEED		= 26,
+	WMI_EVENT_CONFIG		= 27,
 	WMI_EVENT_GPU_FAN_SPEED		= 32,
 	WMI_EVENT_WIN_KEY_LOCK		= 33,
 	WMI_EVENT_RESERVED_23		= 34,
@@ -607,18 +613,54 @@ static const struct attribute *const laptop_attrs[] = {
 ATTRIBUTE_GROUPS(laptop);
 
 static const struct key_entry bitland_mifs_wmi_keymap[] = {
-	{ KE_KEY, WMI_EVENT_OPEN_APP, { KEY_PROG1 } },
-	{ KE_KEY, WMI_EVENT_CALCULATOR_START, { KEY_CALC } },
-	{ KE_KEY, WMI_EVENT_BROWSER_START, { KEY_WWW } },
-	{ KE_IGNORE, WMI_EVENT_FN_J, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_F, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_0, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_1, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_2, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_3, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_4, { KEY_RESERVED } },
-	{ KE_IGNORE, WMI_EVENT_FN_5, { KEY_RESERVED } },
-	{ KE_END, 0 }
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_OPEN_APP, 1, 0), { KEY_PROG1 } },
+
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_CALCULATOR_START, 1, 0), { KEY_CALC } },
+
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_BROWSER_START, 1, 0), { KEY_WWW } },
+
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_J, 0, 0), {} },
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_F, 0, 0), {} },
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_0, 0, 0), {} },
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_1, 0, 0), {} },
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_2, 0, 0), {} },
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_3, 0, 0), {} },
+	{ KE_IGNORE, BI_HOTKEY_CODE(WMI_EVENT_FN_5, 0, 0), {} },
+
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_SELECTIVE_SCREENSHOT, 0, 0),
+		{ KEY_SELECTIVE_SCREENSHOT } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_ALL_APPLICATIONS, 0, 0), { KEY_ALL_APPLICATIONS } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_CONFIG, 0, 0), { KEY_CONFIG } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_CONFIG, 1, 0), { KEY_CONFIG } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_SWITCHVIDEOMODE, 1, 0), { KEY_SWITCHVIDEOMODE } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_SWITCHVIDEOMODE, 0, 0), { KEY_SWITCHVIDEOMODE } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_REFRESH_RATE, 0, 0), { KEY_REFRESH_RATE_TOGGLE } },
+
+	/* AI button has code for each position */
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_5, 1, 0), { KEY_ASSISTANT } },
+
+	{ KE_KEY, BI_HOTKEY_CODE(0x19, 1, 0), { KEY_ASSISTANT } },
+
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_KBD_BRIGHTNESS, 0, 0), {KEY_KBDILLUMTOGGLE} },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_KBD_BRIGHTNESS, 0x80, 0), {KEY_KBDILLUMTOGGLE} },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_KBD_BRIGHTNESS, 5, 0), {KEY_KBDILLUMTOGGLE} },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_KBD_BRIGHTNESS, 0x0a, 0), {KEY_KBDILLUMTOGGLE} },
+
+	/* Xiaomi G Command Center */
+	{ KE_KEY, BI_HOTKEY_CODE(0x0a, 1, 0), { KEY_VENDOR } },
+
+	/* Fn Lock state */
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FNLOCK_STATE, 0, 0), { KEY_FN_ESC } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FNLOCK_STATE, 1, 0), { KEY_FN_ESC } },
+
+	/* Fn+`/1/2/3/4 */
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_F, 1, 0), { KEY_F13 } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_0, 1, 0), { KEY_F14 } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_1, 1, 0), { KEY_F15 } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_2, 1, 0), { KEY_F16 } },
+	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_3, 1, 0), { KEY_F17 } },
+
+	{ KE_END }
 };
 
 static void bitland_notifier_unregister(void *data)
@@ -736,13 +778,42 @@ static int bitland_mifs_wmi_probe(struct wmi_device *wdev, const void *context)
 				       &drv_data->notifier);
 }
 
+static bool bitland_is_ai_key_scancode(unsigned int code)
+{
+	return code == BI_HOTKEY_CODE(WMI_EVENT_FN_5, 1, 0) ||
+		code == BI_HOTKEY_CODE(0x19, 1, 0);
+}
+
+static void bitland_mifs_wmi_report_key(struct wmi_device *wdev, u32 payload)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(&wdev->dev);
+	struct key_entry *entry;
+	bool autorelease = true;
+	int value = 1;
+
+	entry = sparse_keymap_entry_from_scancode(data->input_dev, payload);
+	if (!entry) {
+		dev_dbg(&wdev->dev, "Unknown WMI hotkey with payload 0x%08x\n", payload);
+		return;
+	}
+
+	/* AI key quirk */
+	if (bitland_is_ai_key_scancode(entry->code)) {
+		value = !(payload & AI_KEY_VALUE_MASK);
+		autorelease = false;
+	}
+
+	guard(mutex)(&data->lock);
+	sparse_keymap_report_entry(data->input_dev, entry, value, autorelease);
+}
+
 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;
+	u32 payload;
 
 	/* Validate event type */
 	if (event->event_type != WMI_EVENT_TYPE_HOTKEY)
@@ -758,24 +829,14 @@ static void bitland_mifs_wmi_notify(struct wmi_device *wdev,
 		blocking_notifier_call_chain(&bitland_notifier_list,
 					     BITLAND_NOTIFY_KBD_BRIGHTNESS,
 					     &brightness);
-		break;
+		return;
 
 	case WMI_EVENT_PERFORMANCE_PLAN:
+	case WMI_EVENT_PERFORMANCE_PLAN_ALT:
 		blocking_notifier_call_chain(&bitland_notifier_list,
 					     BITLAND_NOTIFY_PLATFORM_PROFILE,
 					     NULL);
-		break;
-
-	case WMI_EVENT_OPEN_APP:
-	case WMI_EVENT_CALCULATOR_START:
-	case WMI_EVENT_BROWSER_START: {
-		guard(mutex)(&data->lock);
-		if (!sparse_keymap_report_event(data->input_dev,
-						event->event_id, 1, true))
-			dev_warn(&wdev->dev, "Unknown key pressed: 0x%02x\n",
-				 event->event_id);
-		break;
-	}
+		return;
 
 	/*
 	 * The device has 3 fans (CPU, GPU, SYS),
@@ -783,6 +844,14 @@ static void bitland_mifs_wmi_notify(struct wmi_device *wdev,
 	 */
 	case WMI_EVENT_CPU_FAN_SPEED:
 	case WMI_EVENT_GPU_FAN_SPEED:
+		/* Redmi refresh rate toggle quirk */
+		if (event->event_id == WMI_EVENT_CPU_FAN_SPEED &&
+		    event->value_low == 0 && event->value_high == 0) {
+			payload = BI_HOTKEY_CODE(WMI_EVENT_REFRESH_RATE, 0, 0);
+			bitland_mifs_wmi_report_key(wdev, payload);
+			return;
+		}
+
 		if (event->event_id == WMI_EVENT_CPU_FAN_SPEED)
 			fan_data.channel = 0;
 		else
@@ -793,27 +862,17 @@ static void bitland_mifs_wmi_notify(struct wmi_device *wdev,
 		blocking_notifier_call_chain(&bitland_notifier_list,
 					     BITLAND_NOTIFY_HWMON,
 					     &fan_data);
-		break;
-
-	case WMI_EVENT_AIRPLANE_MODE:
-	case WMI_EVENT_TOUCHPAD_STATE:
-	case WMI_EVENT_FNLOCK_STATE:
-	case WMI_EVENT_KBD_MODE:
-	case WMI_EVENT_CAPSLOCK_STATE:
-	case WMI_EVENT_NUMLOCK_STATE:
-	case WMI_EVENT_SCROLLLOCK_STATE:
-	case WMI_EVENT_REFRESH_RATE:
-	case WMI_EVENT_WIN_KEY_LOCK:
-		/* These events are informational or handled by firmware */
-		dev_dbg(&wdev->dev, "State change event: id=%d value=%d\n",
-			event->event_id, event->value_low);
-		break;
+		return;
 
 	default:
-		dev_dbg(&wdev->dev, "Unknown event: id=0x%02x value=0x%02x\n",
-			event->event_id, event->value_low);
+		dev_dbg(&wdev->dev,
+			"Unknown WMI event: id=0x%02x value_low=0x%02x value_high=0x%02x\n",
+			event->event_id, event->value_low, event->value_high);
 		break;
 	}
+
+	payload = get_unaligned_le32(buffer->data);
+	bitland_mifs_wmi_report_key(wdev, payload);
 }
 
 static const struct wmi_device_id bitland_mifs_wmi_id_table[] = {
-- 
2.56.0

[PATCH v13 3/7] platform/x86: bitland-mifs-wmi: Add Redmi mic-mute key entries

[Mingyou Chen]

Add the missing Redmibook mic-mute hotkey definitions to the shared
sparse keymap table:
- 0x00002101
- 0x00012101

Reported-by: Nika Krasnova <nika@nikableh.moe>
Link:
https://lore.kernel.org/platform-driver-x86/20260531123345.237521-1-nika@nikableh.moe/
Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 drivers/platform/x86/bitland-mifs-wmi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index 9afa2e2764b0..0d7815c2faf9 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -111,7 +111,7 @@ enum bitland_mifs_event_id {
 	WMI_EVENT_CPU_FAN_SPEED		= 26,
 	WMI_EVENT_CONFIG		= 27,
 	WMI_EVENT_GPU_FAN_SPEED		= 32,
-	WMI_EVENT_WIN_KEY_LOCK		= 33,
+	WMI_EVENT_MIC_MUTE		= 33,
 	WMI_EVENT_RESERVED_23		= 34,
 	WMI_EVENT_OPEN_APP		= 35,
 };
@@ -636,6 +636,10 @@ static const struct key_entry bitland_mifs_wmi_keymap[] = {
 	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_SWITCHVIDEOMODE, 0, 0), { KEY_SWITCHVIDEOMODE } },
 	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_REFRESH_RATE, 0, 0), { KEY_REFRESH_RATE_TOGGLE } },
 
+	/* Mic-mute key */
+	{ KE_KEY,    BI_HOTKEY_CODE(WMI_EVENT_MIC_MUTE, 0, 0), { KEY_MICMUTE } },
+	{ KE_KEY,    BI_HOTKEY_CODE(WMI_EVENT_MIC_MUTE, 1, 0), { KEY_MICMUTE } },
+
 	/* AI button has code for each position */
 	{ KE_KEY, BI_HOTKEY_CODE(WMI_EVENT_FN_5, 1, 0), { KEY_ASSISTANT } },
 
-- 
2.56.0

[PATCH v13 4/7] platform/x86: redmi-wmi: Drop redmi-wmi driver

[Mingyou Chen]

The redmi-wmi driver is no longer needed because its functionality
has been superseded by the new generic bitland platform driver.
All supported Redmi laptop models are now handled properly via the
updated WMI interfaces in bitland-mifs-wmi.

Remove the obsolete code, Kconfig entries, and Makefile references
to clean up the platform directory.

Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 MAINTAINERS                      |   6 --
 drivers/platform/x86/Kconfig     |  11 +--
 drivers/platform/x86/Makefile    |   1 -
 drivers/platform/x86/redmi-wmi.c | 154 -------------------------------
 4 files changed, 4 insertions(+), 168 deletions(-)
 delete mode 100644 drivers/platform/x86/redmi-wmi.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 63d2fec54e86..401811130a28 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23037,12 +23037,6 @@ S:	Maintained
 T:	git https://github.com/pkshih/rtw.git
 F:	drivers/net/wireless/realtek/rtw89/
 
-REDMIBOOK WMI DRIVERS
-M:	Gladyshev Ilya <foxido@foxido.dev>
-L:	platform-driver-x86@vger.kernel.org
-S:	Maintained
-F:	drivers/platform/x86/redmi-wmi.c
-
 BITLAND LAPTOP DRIVER
 M:	Mingyou Chen <qby140326@gmail.com>
 M:	Ilya Gladyshev <ilya.gladyshev@linux.dev>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 7ee9ff3879c9..569644ed1bf5 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -79,16 +79,13 @@ config XIAOMI_WMI
 	  be called xiaomi-wmi.
 
 config REDMI_WMI
-	tristate "Redmibook WMI key driver"
+	tristate "Redmibook WMI key driver (DEPRECATED)"
 	depends on ACPI_WMI
 	depends on INPUT
-	select INPUT_SPARSEKMAP
+	select BITLAND_MIFS_WMI
 	help
-	  Say Y here if you want support for WMI-based hotkey events on
-	  Xiaomi Redmibook devices.
-
-	  To compile this driver as a module, choose M here: the module will
-	  be called redmi-wmi.
+	  This option is deprecated and will be removed in a future release.
+	  Please enable CONFIG_BITLAND_MIFS_WMI directly.
 
 config GIGABYTE_WMI
 	tristate "Gigabyte WMI temperature driver"
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index b90c544387be..3052b92fb5fa 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -9,7 +9,6 @@ obj-$(CONFIG_HUAWEI_WMI)		+= huawei-wmi.o
 obj-$(CONFIG_MXM_WMI)			+= mxm-wmi.o
 obj-$(CONFIG_NVIDIA_WMI_EC_BACKLIGHT)	+= nvidia-wmi-ec-backlight.o
 obj-$(CONFIG_XIAOMI_WMI)		+= xiaomi-wmi.o
-obj-$(CONFIG_REDMI_WMI)			+= redmi-wmi.o
 obj-$(CONFIG_GIGABYTE_WMI)		+= gigabyte-wmi.o
 obj-$(CONFIG_BITLAND_MIFS_WMI)		+= bitland-mifs-wmi.o
 
diff --git a/drivers/platform/x86/redmi-wmi.c b/drivers/platform/x86/redmi-wmi.c
deleted file mode 100644
index cc82ef502002..000000000000
--- a/drivers/platform/x86/redmi-wmi.c
+++ /dev/null
@@ -1,154 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* WMI driver for Xiaomi Redmibooks */
-
-#include <linux/acpi.h>
-#include <linux/bits.h>
-#include <linux/device.h>
-#include <linux/input.h>
-#include <linux/input/sparse-keymap.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/unaligned.h>
-#include <linux/wmi.h>
-
-#include <uapi/linux/input-event-codes.h>
-
-#define WMI_REDMIBOOK_KEYBOARD_EVENT_GUID "46C93E13-EE9B-4262-8488-563BCA757FEF"
-
-#define AI_KEY_VALUE_MASK BIT(8)
-
-static const struct key_entry redmi_wmi_keymap[] = {
-	{KE_KEY, 0x00000201,	{KEY_SELECTIVE_SCREENSHOT}},
-	{KE_KEY, 0x00000301,	{KEY_ALL_APPLICATIONS}},
-	{KE_KEY, 0x00001b01,	{KEY_CONFIG}},
-	{KE_KEY, 0x00011b01,	{KEY_CONFIG}},
-	{KE_KEY, 0x00010101,	{KEY_SWITCHVIDEOMODE}},
-	{KE_KEY, 0x00001a01,	{KEY_REFRESH_RATE_TOGGLE}},
-
-	/* AI button has code for each position */
-	{KE_KEY, 0x00011801,	{KEY_ASSISTANT}},
-	{KE_KEY, 0x00011901,	{KEY_ASSISTANT}},
-
-	/* Keyboard backlight: Off / Auto / Low / High (new state in byte 2) */
-	{KE_KEY, 0x00000501,	{KEY_KBDILLUMTOGGLE}},
-	{KE_KEY, 0x00800501,	{KEY_KBDILLUMTOGGLE}},
-	{KE_KEY, 0x00050501,	{KEY_KBDILLUMTOGGLE}},
-	{KE_KEY, 0x000a0501,	{KEY_KBDILLUMTOGGLE}},
-
-	/* Xiaomi G Command Center */
-	{KE_KEY, 0x00010a01,	{KEY_VENDOR}},
-
-	/* OEM preset power mode: 1=Balanced 2=Silent 3=Turbo 4=Full speed */
-	{KE_KEY, 0x00011601,	{KEY_PERFORMANCE}},
-	{KE_KEY, 0x00021601,	{KEY_PERFORMANCE}},
-	{KE_KEY, 0x00031601,	{KEY_PERFORMANCE}},
-	{KE_KEY, 0x00041601,	{KEY_PERFORMANCE}},
-
-	/* Fn Lock state: 1=on 0=off */
-	{KE_KEY, 0x00000701,	{KEY_FN_ESC}},
-	{KE_KEY, 0x00010701,	{KEY_FN_ESC}},
-
-	/* Fn+`/1/2/3/4 */
-	{KE_KEY, 0x00011101, {KEY_F13}},
-	{KE_KEY, 0x00011201, {KEY_F14}},
-	{KE_KEY, 0x00011301, {KEY_F15}},
-	{KE_KEY, 0x00011401, {KEY_F16}},
-	{KE_KEY, 0x00011501, {KEY_F17}},
-
-	{KE_END}
-};
-
-struct redmi_wmi {
-	struct input_dev *input_dev;
-	/* Protects the key event sequence */
-	struct mutex key_lock;
-};
-
-static int redmi_wmi_probe(struct wmi_device *wdev, const void *context)
-{
-	struct redmi_wmi *data;
-	int err;
-
-	/* Init dev */
-	data = devm_kzalloc(&wdev->dev, sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	dev_set_drvdata(&wdev->dev, data);
-
-	err = devm_mutex_init(&wdev->dev, &data->key_lock);
-	if (err)
-		return err;
-
-	data->input_dev = devm_input_allocate_device(&wdev->dev);
-	if (!data->input_dev)
-		return -ENOMEM;
-
-	data->input_dev->name = "Redmibook WMI keys";
-	data->input_dev->phys = "wmi/input0";
-
-	err = sparse_keymap_setup(data->input_dev, redmi_wmi_keymap, NULL);
-	if (err)
-		return err;
-
-	return input_register_device(data->input_dev);
-}
-
-static void redmi_wmi_notify(struct wmi_device *wdev, union acpi_object *obj)
-{
-	struct key_entry *entry;
-	struct redmi_wmi *data = dev_get_drvdata(&wdev->dev);
-	bool autorelease = true;
-	u32 payload;
-	int value = 1;
-
-	if (obj->type != ACPI_TYPE_BUFFER) {
-		dev_err(&wdev->dev, "Bad response type %u\n", obj->type);
-		return;
-	}
-
-	if (obj->buffer.length < 32) {
-		dev_err(&wdev->dev, "Invalid buffer length %u\n", obj->buffer.length);
-		return;
-	}
-
-	payload = get_unaligned_le32(obj->buffer.pointer);
-	entry = sparse_keymap_entry_from_scancode(data->input_dev, payload);
-
-	if (!entry) {
-		dev_dbg(&wdev->dev, "Unknown WMI event with payload %u", payload);
-		return;
-	}
-
-	/* AI key quirk */
-	if (entry->keycode == KEY_ASSISTANT) {
-		value = !(payload & AI_KEY_VALUE_MASK);
-		autorelease = false;
-	}
-
-	guard(mutex)(&data->key_lock);
-	sparse_keymap_report_entry(data->input_dev, entry, value, autorelease);
-}
-
-static const struct wmi_device_id redmi_wmi_id_table[] = {
-	{ WMI_REDMIBOOK_KEYBOARD_EVENT_GUID, NULL },
-	{ }
-};
-
-static struct wmi_driver redmi_wmi_driver = {
-	.driver = {
-		.name = "redmi-wmi",
-		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
-	},
-	.id_table = redmi_wmi_id_table,
-	.min_event_size = 32,
-	.probe = redmi_wmi_probe,
-	.notify = redmi_wmi_notify,
-	.no_singleton = true,
-};
-module_wmi_driver(redmi_wmi_driver);
-
-MODULE_DEVICE_TABLE(wmi, redmi_wmi_id_table);
-MODULE_AUTHOR("Gladyshev Ilya <foxido@foxido.dev>");
-MODULE_DESCRIPTION("Redmibook WMI driver");
-MODULE_LICENSE("GPL");
-- 
2.56.0

[PATCH v13 5/7] platform/x86: bitland-mifs-wmi: Add quirks table

[Mingyou Chen]

The MIFS WMI interface is shared by several Bitland ODM laptops which
differ in the layout of the performance mode values of
WMI_FN_SYSTEM_PER_MODE and in the capability checks.

Introduce a quirks table to support multiple machine families without
sprinkling model checks over the driver.

Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 drivers/platform/x86/bitland-mifs-wmi.c | 180 ++++++++++++++++--------
 1 file changed, 122 insertions(+), 58 deletions(-)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index 0d7815c2faf9..a54eb5bba1e8 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -12,6 +12,7 @@
 #include <linux/bits.h>
 #include <linux/container_of.h>
 #include <linux/dev_printk.h>
+#include <linux/dmi.h>
 #include <linux/device.h>
 #include <linux/device/devres.h>
 #include <linux/err.h>
@@ -84,6 +85,41 @@ enum bitland_mifs_power_profile {
 	WMI_PP_FULL_SPEED	= 3,
 };
 
+struct bitland_mifs_wmi_data;
+
+struct bitland_profile_entry {
+	enum platform_profile_option profile;
+	u8 wmi_val;
+	bool no_set;
+};
+
+struct bitland_mifs_quirks {
+	const struct bitland_profile_entry *profile_entries;
+	size_t num_profile_entries;
+
+	bool return_code_at_end;
+	bool skip_ac_type_check;
+
+	/* Accept return value 0 on SET wmi functions */
+	bool accept_zero_function;
+};
+
+static const struct bitland_profile_entry default_profile_entries[] = {
+	{ PLATFORM_PROFILE_LOW_POWER,            WMI_PP_QUIET },
+	{ PLATFORM_PROFILE_BALANCED,             WMI_PP_BALANCED },
+	{ PLATFORM_PROFILE_BALANCED_PERFORMANCE, WMI_PP_PERFORMANCE },
+	{ PLATFORM_PROFILE_PERFORMANCE,          WMI_PP_FULL_SPEED },
+};
+
+static const struct bitland_mifs_quirks default_quirks = {
+	.profile_entries = default_profile_entries,
+	.num_profile_entries = ARRAY_SIZE(default_profile_entries),
+};
+
+static const struct dmi_system_id bitland_mifs_dmi_table[] = {
+	{}
+};
+
 enum bitland_mifs_event_id {
 	WMI_EVENT_SWITCHVIDEOMODE	= 1,
 	WMI_EVENT_SELECTIVE_SCREENSHOT	= 2,
@@ -131,12 +167,24 @@ struct bitland_mifs_input {
 	u8 payload[28];
 } __packed;
 
-struct bitland_mifs_output {
+struct bitland_mifs_output_head_rc {
 	__le16 return_code;
 	__le16 function;
 	u8 data[28];
 } __packed;
 
+struct bitland_mifs_output_tail_rc {
+	__le16 function;
+	u8 data[28];
+	__le16 return_code;
+} __packed;
+
+union bitland_mifs_output_buf {
+	struct bitland_mifs_output_head_rc head;
+	struct bitland_mifs_output_tail_rc tail;
+	u8 raw[32];
+};
+
 struct bitland_mifs_event {
 	u8 event_type;
 	u8 event_id;
@@ -166,27 +214,41 @@ struct bitland_mifs_wmi_data {
 	struct input_dev *input_dev;
 	struct device *hwmon_dev;
 	struct device *pp_dev;
+	const struct bitland_mifs_quirks *quirks;
 	enum platform_profile_option saved_profile;
 };
 
 static int bitland_mifs_wmi_call(struct bitland_mifs_wmi_data *data,
 				 const struct bitland_mifs_input *input,
-				 struct bitland_mifs_output *output)
+				 struct bitland_mifs_output_head_rc *output)
 {
 	struct wmi_buffer in_buf = { .length = sizeof(*input), .data = (void *)input };
 	struct wmi_buffer out_buf = { 0 };
+	const u8 *payload_data;
+	__le16 return_code;
+	__le16 function;
 	int ret;
 
 	guard(mutex)(&data->lock);
 
 	ret = wmidev_invoke_method(data->wdev, 0, 1, &in_buf, &out_buf,
-				   sizeof(struct bitland_mifs_output));
+				   sizeof(union bitland_mifs_output_buf));
 	if (ret)
 		return ret;
 
-	struct bitland_mifs_output *result __free(kfree) = out_buf.data;
+	union bitland_mifs_output_buf *result __free(kfree) = out_buf.data;
 
-	switch (le16_to_cpu(result->return_code)) {
+	if (data->quirks->return_code_at_end) {
+		return_code = result->tail.return_code;
+		function = result->tail.function;
+		payload_data = result->tail.data;
+	} else {
+		return_code = result->head.return_code;
+		function = result->head.function;
+		payload_data = result->head.data;
+	}
+
+	switch (le16_to_cpu(return_code)) {
 	case WMI_RETURN_CODE_SUCCESS:
 		break;
 	case WMI_RETURN_CODE_UNKNOWN_FUNCTION:
@@ -195,11 +257,16 @@ static int bitland_mifs_wmi_call(struct bitland_mifs_wmi_data *data,
 		return -EIO;
 	}
 
-	if (result->function != input->function)
-		return -ENOMSG;
+	if (function != input->function) {
+		if (!(data->quirks->accept_zero_function && function == 0))
+			return -ENOMSG;
+	}
 
-	if (output)
-		memcpy(output, result, sizeof(*output));
+	if (output) {
+		output->return_code = return_code;
+		output->function = function;
+		memcpy(output->data, payload_data, sizeof(output->data));
+	}
 
 	return 0;
 }
@@ -208,45 +275,41 @@ static int laptop_profile_get(struct device *dev,
 			      enum platform_profile_option *profile)
 {
 	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	const struct bitland_mifs_quirks *quirks = data->quirks;
 	struct bitland_mifs_input input = {
 		.operation = cpu_to_le16(WMI_METHOD_GET),
 		.function = cpu_to_le16(WMI_FN_SYSTEM_PER_MODE),
 	};
-	struct bitland_mifs_output result;
+	struct bitland_mifs_output_head_rc result;
+	size_t i;
 	int ret;
 
 	ret = bitland_mifs_wmi_call(data, &input, &result);
 	if (ret)
 		return ret;
 
-	switch (result.data[0]) {
-	case WMI_PP_BALANCED:
-		*profile = PLATFORM_PROFILE_BALANCED;
-		break;
-	case WMI_PP_PERFORMANCE:
-		*profile = PLATFORM_PROFILE_BALANCED_PERFORMANCE;
-		break;
-	case WMI_PP_QUIET:
-		*profile = PLATFORM_PROFILE_LOW_POWER;
-		break;
-	case WMI_PP_FULL_SPEED:
-		*profile = PLATFORM_PROFILE_PERFORMANCE;
-		break;
-	default:
-		return -EINVAL;
+	for (i = 0; i < quirks->num_profile_entries; i++) {
+		if (quirks->profile_entries[i].wmi_val == result.data[0]) {
+			*profile = quirks->profile_entries[i].profile;
+			return 0;
+		}
 	}
-	return 0;
+
+	return -EINVAL;
 }
 
-static int bitland_check_performance_capability(struct bitland_mifs_wmi_data *data)
+static int bitland_pp_check_capability(struct bitland_mifs_wmi_data *data)
 {
 	struct bitland_mifs_input input = {
 		.operation = cpu_to_le16(WMI_METHOD_GET),
 		.function = cpu_to_le16(WMI_FN_SYSTEM_AC_TYPE),
 	};
-	struct bitland_mifs_output output;
+	struct bitland_mifs_output_head_rc output;
 	int ret;
 
+	if (data->quirks->skip_ac_type_check)
+		return power_supply_is_system_supplied() > 0 ? 0 : -EOPNOTSUPP;
+
 	/* Full-speed/performance mode requires DC power (not USB-C) */
 	if (!power_supply_is_system_supplied())
 		return -EOPNOTSUPP;
@@ -269,47 +332,42 @@ static int laptop_profile_set(struct device *dev,
 			      enum platform_profile_option profile)
 {
 	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	const struct bitland_mifs_quirks *quirks = data->quirks;
 	struct bitland_mifs_input input = {
 		.operation = cpu_to_le16(WMI_METHOD_SET),
 		.function = cpu_to_le16(WMI_FN_SYSTEM_PER_MODE),
 	};
+	size_t i;
 	int ret;
-	u8 val;
 
-	switch (profile) {
-	case PLATFORM_PROFILE_LOW_POWER:
-		val = WMI_PP_QUIET;
-		break;
-	case PLATFORM_PROFILE_BALANCED:
-		val = WMI_PP_BALANCED;
-		break;
-	case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
-		ret = bitland_check_performance_capability(data);
-		if (ret)
-			return ret;
-		val = WMI_PP_PERFORMANCE;
-		break;
-	case PLATFORM_PROFILE_PERFORMANCE:
-		ret = bitland_check_performance_capability(data);
+	if (profile == PLATFORM_PROFILE_PERFORMANCE ||
+	    profile == PLATFORM_PROFILE_BALANCED_PERFORMANCE) {
+		ret = bitland_pp_check_capability(data);
 		if (ret)
 			return ret;
-		val = WMI_PP_FULL_SPEED;
-		break;
-	default:
-		return -EOPNOTSUPP;
 	}
 
-	input.payload[0] = val;
+	for (i = 0; i < quirks->num_profile_entries; i++) {
+		if (quirks->profile_entries[i].profile == profile &&
+		    !quirks->profile_entries[i].no_set) {
+			input.payload[0] = quirks->profile_entries[i].wmi_val;
+			return bitland_mifs_wmi_call(data, &input, NULL);
+		}
+	}
 
-	return bitland_mifs_wmi_call(data, &input, NULL);
+	return -EOPNOTSUPP;
 }
 
 static int platform_profile_probe(void *drvdata, unsigned long *choices)
 {
-	set_bit(PLATFORM_PROFILE_LOW_POWER, choices);
-	set_bit(PLATFORM_PROFILE_BALANCED, choices);
-	set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, choices);
-	set_bit(PLATFORM_PROFILE_PERFORMANCE, choices);
+	struct bitland_mifs_wmi_data *data = drvdata;
+	const struct bitland_mifs_quirks *quirks = data->quirks;
+	size_t i;
+
+	for (i = 0; i < quirks->num_profile_entries; i++) {
+		if (!quirks->profile_entries[i].no_set)
+			set_bit(quirks->profile_entries[i].profile, choices);
+	}
 
 	return 0;
 }
@@ -366,7 +424,7 @@ static int laptop_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 	struct bitland_mifs_input input = {
 		.operation = cpu_to_le16(WMI_METHOD_GET),
 	};
-	struct bitland_mifs_output res;
+	struct bitland_mifs_output_head_rc res;
 	int ret;
 
 	switch (type) {
@@ -455,7 +513,7 @@ static enum led_brightness laptop_kbd_led_get(struct led_classdev *led_cdev)
 		.operation = cpu_to_le16(WMI_METHOD_GET),
 		.function = cpu_to_le16(WMI_FN_RGB_KB_BRIGHTNESS),
 	};
-	struct bitland_mifs_output res;
+	struct bitland_mifs_output_head_rc res;
 	int ret;
 
 	ret = bitland_mifs_wmi_call(data, &input, &res);
@@ -480,7 +538,7 @@ static ssize_t gpu_mode_show(struct device *dev, struct device_attribute *attr,
 		.operation = cpu_to_le16(WMI_METHOD_GET),
 		.function = cpu_to_le16(WMI_FN_GPU_MODE),
 	};
-	struct bitland_mifs_output res;
+	struct bitland_mifs_output_head_rc res;
 	u8 mode_val;
 	int ret;
 
@@ -534,7 +592,7 @@ static ssize_t kb_mode_show(struct device *dev, struct device_attribute *attr,
 		.operation = cpu_to_le16(WMI_METHOD_GET),
 		.function = cpu_to_le16(WMI_FN_RGB_KB_MODE),
 	};
-	struct bitland_mifs_output res;
+	struct bitland_mifs_output_head_rc res;
 	u8 mode_val;
 	int ret;
 
@@ -712,6 +770,7 @@ static int bitland_mifs_wmi_probe(struct wmi_device *wdev, const void *context)
 		.default_label = ":" LED_FUNCTION_KBD_BACKLIGHT,
 		.devname_mandatory = true,
 	};
+	const struct dmi_system_id *dmi_id;
 	int ret;
 
 	drv_data = devm_kzalloc(&wdev->dev, sizeof(*drv_data), GFP_KERNEL);
@@ -726,6 +785,11 @@ static int bitland_mifs_wmi_probe(struct wmi_device *wdev, const void *context)
 
 	dev_set_drvdata(&wdev->dev, drv_data);
 
+	drv_data->quirks = &default_quirks;
+	dmi_id = dmi_first_match(bitland_mifs_dmi_table);
+	if (dmi_id)
+		drv_data->quirks = dmi_id->driver_data;
+
 	if (dev_type == BITLAND_WMI_EVENT) {
 		/* Register input device for hotkeys */
 		drv_data->input_dev = devm_input_allocate_device(&wdev->dev);
-- 
2.56.0

[PATCH v13 6/7] platform/x86: bitland-mifs-wmi: Fallback to balanced platform profile if last performance profile is not available

[Mingyou Chen]

On Bitland laptops, performance profiles require an external power
supply. If the system enters suspend in a performance profile and the AC
adapter is unplugged while the machine is asleep, laptop_profile_set()
fails with -EOPNOTSUPP during resume when attempting to re-apply
saved_profile.

Returning an error from the resume callback simply because the power
cable was removed during sleep is undesirable, as the device is
otherwise
fully functional.

Gracefully handle this condition by falling back to
PLATFORM_PROFILE_BALANCED
whenever restoring the saved profile returns -EOPNOTSUPP. Update
saved_profile accordingly and notify user space via
platform_profile_notify() so daemons such as power-profiles-daemon stay
in sync with the actual hardware state.

Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 drivers/platform/x86/bitland-mifs-wmi.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index a54eb5bba1e8..f4f37ae2f424 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -392,13 +392,27 @@ static int bitland_mifs_wmi_suspend(struct device *dev)
 static int bitland_mifs_wmi_resume(struct device *dev)
 {
 	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	int ret;
 
 	/* Skip event device */
 	if (!data->pp_dev)
 		return 0;
 
+	ret = laptop_profile_set(dev, data->saved_profile);
+
+	if (ret == -EOPNOTSUPP && data->saved_profile != PLATFORM_PROFILE_BALANCED) {
+		dev_dbg(dev, "Cannot restore profile %d (likely on battery), falling back to balanced\n",
+			data->saved_profile);
+
+		ret = laptop_profile_set(dev, PLATFORM_PROFILE_BALANCED);
+		if (!ret) {
+			data->saved_profile = PLATFORM_PROFILE_BALANCED;
+			platform_profile_notify(data->pp_dev);
+		}
+	}
+
 	dev_dbg(dev, "Resuming, restoring profile %d\n", data->saved_profile);
-	return laptop_profile_set(dev, data->saved_profile);
+	return ret;
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(bitland_mifs_wmi_pm_ops,
-- 
2.56.0

[PATCH v13 7/7] platform/x86: bitland-mifs-wmi: Permit zero on SET functions

[Mingyou Chen]

On Bitland laptops, the ACPI firmware returns 0x0000 for the function
field on SET operations, while setting the return code to success
(0x8000).

Because bitland_mifs_wmi_call() expects the returned function to match
the requested function ID, these write operations fail with -ENOMSG (-42).

Allow a return function value of 0 on SET operations to prevent false
error reports.

Fixes: dc1ec4fa86b2b ("platform/x86: bitland-mifs-wmi: Add new Bitland MIFS WMI driver")
Signed-off-by: Mingyou Chen <qby140326@gmail.com>
---
 drivers/platform/x86/bitland-mifs-wmi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
index f4f37ae2f424..a4c341ffbb9b 100644
--- a/drivers/platform/x86/bitland-mifs-wmi.c
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -258,10 +258,14 @@ static int bitland_mifs_wmi_call(struct bitland_mifs_wmi_data *data,
 	}
 
 	if (function != input->function) {
-		if (!(data->quirks->accept_zero_function && function == 0))
-			return -ENOMSG;
+		if (function == 0 && (data->quirks->accept_zero_function ||
+				      input->operation == cpu_to_le16(WMI_METHOD_SET)))
+			goto fn_ok;
+
+		return -ENOMSG;
 	}
 
+fn_ok:
 	if (output) {
 		output->return_code = return_code;
 		output->function = function;
-- 
2.56.0