[PATCH v10] platform/x86: bitland-mifs-wmi: Add new Bitland MIFS WMI driver

[Mingyou Chen]

Add a new driver for Bitland laptops that utilize the MIFS (MiInterface)
WMI interface.

The driver implements several features through the WMI interface:

- Platform Profile: Supports "Quiet", "Balanced", "Performance", and
  "Full Speed" modes. The "Full Speed" mode is intelligently restricted
  based on the AC adapter type (requires DC power, not supported on
  USB-C charging) as required by the hardware.
- Hwmon: Provides monitoring for CPU, GPU, and System fan speeds,
  as well as CPU temperature sensors.
- Keyboard Backlight: Integrated with the LED class device for
  brightness control and provides sysfs attributes for keyboard modes
  (cyclic, fixed, etc.).
- GPU Mode: Allows switching between Hybrid, Discrete, and UMA
  graphics modes via sysfs.
- Hotkeys: Handles WMI events for system hotkeys (Calculator, Browser,
  App launch) using sparse keymaps and reports status changes for
  Airplane mode, Touchpad, and CapsLock.
- Fan Boost: Provides a sysfs interface to force fans to maximum speed.

The driver registers two WMI GUIDs:
- B60BFB48-3E5B-49E4-A0E9-8CFFE1B3434B: Control methods
- 46C93E13-EE9B-4262-8488-563BCA757FEF: Event notifications

Signed-off-by: Mingyou Chen <qby140326@xxxxxxxxx>
---
v10:
  - After some researches, I acknowledge my device is from Bitland, not
    Tongfang. Rename the driver to bitland-mifs-wmi
v9:
  - Fix style issues in .rst documentation
  - Rewrite the wmi_call func with correct usage
  - Use power_supply_is_system_supplied in kernel instead of
    is_ac_online
  - Remove the PLATFORM_PROFILE_LAST check in wmi_resume function
  - Directly return in the hwmon_temp case in hwmon_read function
  - return -EPROTO on invalid wmi return value in gpu_mode and
    keyboard brightness
  - Remove thge dev_err debug messages
  - Rewrite the wmi_notify method with .notify_new callback in
    linux-next
  - Call hwmon_notify_event (with a notifier) on WMI fan speed events

v8:
  - Fix coding style issues
  - Use MILLIDEGREE_PER_DEGREE instead of MILLI to define the temperature unit more precisely.
  - Align lines with the first occurrence of HWMON
  - Remove the unnecessary empty line in error handling
  - Reverse the logic of kb_mode_strings and drop the mode_str variable

v7:
  - Remove the unused includes (asm/)
  - Align values with tab
  - remove the previous test code which i forgot to remove
  - return values directly with the "return" statement
  - rmeove the wrong comment "Full-speed" since I've already use the value
    "WMI_PP_FULL_SPEED" in the switch case
  - remove the empty lines
  - Change the two variables (val, ret) to reverse xmas-tree order.
  - Add missing includes and sort them in the alphabetical order.
  - use endianness types and conversion functions to parse temperature in
    the wmi response

v6:
  - add base commit

v5:
  - add fallthrough on the PLATFORM_PROFILE_BALANCED_PERFORMANCE switch
    case

v4:
  - check the DC power state before switching to performance/full-speed mode

v3:
  - Fix email address mismatch in Signed-off-by and From headers.
  - implement the WMI event handler
  - code style improvments
  - condition on the performance platform profile switch
  - driver documentation

v2:
  - Add PLATFORM_PROFILE_BALANCED_PERFORMANCE platform profile support

 .../wmi/devices/bitland-mifs-wmi.rst          | 207 +++++
 drivers/platform/x86/Kconfig                  |  16 +
 drivers/platform/x86/Makefile                 |   1 +
 drivers/platform/x86/bitland-mifs-wmi.c       | 851 ++++++++++++++++++
 4 files changed, 1075 insertions(+)
 create mode 100644 Documentation/wmi/devices/bitland-mifs-wmi.rst
 create mode 100644 drivers/platform/x86/bitland-mifs-wmi.c

diff --git a/Documentation/wmi/devices/bitland-mifs-wmi.rst b/Documentation/wmi/devices/bitland-mifs-wmi.rst
new file mode 100644
index 000000000000..e0f6b4474013
--- /dev/null
+++ b/Documentation/wmi/devices/bitland-mifs-wmi.rst
@@ -0,0 +1,207 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+========================================
+Bitland MIFS driver (bitland-mifs-wmi)
+========================================
+
+Introduction
+============
+
+
+EC WMI interface description
+============================
+
+The EC WMI interface description can be decoded from the embedded binary MOF (bmof)
+data using the `bmfdec <https://github.com/pali/bmfdec>`_ utility:
+
+::
+
+  class WMIEvent : __ExtrinsicEvent {
+  };
+
+  [WMI, Dynamic, Provider("WmiProv"), Locale("MS\\0x40A"), Description("Root WMI HID_EVENT20"), guid("{46c93e13-ee9b-4262-8488-563bca757fef}")]
+  class HID_EVENT20 : WmiEvent {
+    [key, read] string InstanceName;
+    [read] boolean Active;
+    [WmiDataId(1), read, write, Description("Package Data")] uint8 EventDetail[8];
+  };
+
+  [WMI, Dynamic, Provider("WmiProv"), Locale("MS\\0x40A"), Description("Root WMI HID_EVENT21"), guid("{fa78e245-2c0f-4ca1-91cf-15f34e474850}")]
+  class HID_EVENT21 : WmiEvent {
+    [key, read] string InstanceName;
+    [read] boolean Active;
+    [WmiDataId(1), read, write, Description("Package Data")] uint8 EventDetail[8];
+  };
+
+  [WMI, Dynamic, Provider("WmiProv"), Locale("MS\\0x40A"), Description("Root WMI HID_EVENT22"), guid("{1dceaf0a-4d63-44bb-bd0c-0d6281bfddc5}")]
+  class HID_EVENT22 : WmiEvent {
+    [key, read] string InstanceName;
+    [read] boolean Active;
+    [WmiDataId(1), read, write, Description("Package Data")] uint8 EventDetail[8];
+  };
+
+  [WMI, Dynamic, Provider("WmiProv"), Locale("MS\\0x40A"), Description("Root WMI HID_EVENT23"), guid("{3f9e3c26-b077-4f86-91f5-37ff64d8c7ed}")]
+  class HID_EVENT23 : WmiEvent {
+    [key, read] string InstanceName;
+    [read] boolean Active;
+    [WmiDataId(1), read, write, Description("Package Data")] uint8 EventDetail[8];
+  };
+
+  [WMI, Dynamic, provider("WmiProv"), Locale("MS\\0x409"), Description("Class used to operate firmware interface"), guid("{b60bfb48-3e5b-49e4-a0e9-8cffe1b3434b}")]
+  class MICommonInterface {
+    [key, read] string InstanceName;
+    [read] boolean Active;
+
+    [WmiMethodId(1), Implemented, read, write, Description("Method used to support system functions.")] void MiInterface([in, Description("WMI Interface")] uint8 InData[32], [out] uint8 OutData[30], [out] uint16 Reserved);
+  };
+
+Reverse-Engineering the EC WMI interface
+========================================
+
+The OEM software can be download from `this link <https://iknow.lenovo.com.cn/detail/429447>`_
+
+Nothing is obfuscated, In this case, `ILSpy <https://github.com/icsharpcode/ILSpy>`_ could be helpful.
+
+WMI Methods (MICommonInterface)
+========================================
+
+The ``MICommonInterface`` class (GUID: ``{b60bfb48-3e5b-49e4-a0e9-8cffe1b3434b}``)
+is the primary control interface. It uses a 32-byte buffer for both input
+(``InData``) and output (``OutData``).
+
+Method Structure
+----------------
+
+The data packet follows a standardized format:
+
++----------+------------------------------------------------------------------+
+| Byte     | Description                                                      |
++==========+==================================================================+
+| 1        | Method Type: Get (0xFA / 250) or Set (0xFB / 251)                |
++----------+------------------------------------------------------------------+
+| 3        | Command ID (Method Name)                                         |
++----------+------------------------------------------------------------------+
+| 4 - 31   | Arguments (for Set) or Return Data (for Get)                     |
++----------+------------------------------------------------------------------+
+
+
+Command IDs
+-----------
+
+The following Command IDs are used in the third byte of the buffer:
+
++----------+-----------------------+------------------------------------------+
+| ID       | Name                  | Values / Description                     |
++==========+=======================+==========================================+
+| 8        | SystemPerMode         | 0: Balance, 1: Performance, 2: Quiet,    |
+|          |                       | 3: Full-speed                            |
++----------+-----------------------+------------------------------------------+
+| 9        | GPUMode               | 0: Hybrid, 1: Discrete, 2: UMA           |
++----------+-----------------------+------------------------------------------+
+| 10       | KeyboardType          | 0: White, 1: Single RGB, 2: Zone RGB     |
++----------+-----------------------+------------------------------------------+
+| 11       | FnLock                | 0: Off, 1: On                            |
++----------+-----------------------+------------------------------------------+
+| 12       | TPLock                | 0: Unlock, 1: Lock (Touchpad)            |
++----------+-----------------------+------------------------------------------+
+| 13       | CPUGPUSYSFanSpeed     | Returns 12 bytes of fan data:            |
+|          |                       | Bytes 4-5: CPU Fan RPM (Little Endian)   |
+|          |                       | Bytes 6-7: GPU Fan RPM (Little Endian)   |
+|          |                       | Bytes 10-11: SYS Fan RPM (Little Endian) |
++----------+-----------------------+------------------------------------------+
+| 16       | RGBKeyboardMode       | 0: Off, 1: Auto Cyclic, 2: Fixed,        |
+|          |                       | 3: Custom                                |
++----------+-----------------------+------------------------------------------+
+| 17       | RGBKeyboardColor      | Bytes 4, 5, 6: Red, Green, Blue values   |
++----------+-----------------------+------------------------------------------+
+| 18       | RGBKeyboardBrightness | 0-10: Brightness Levels, 128: Auto       |
++----------+-----------------------+------------------------------------------+
+| 19       | SystemAcType          | 1: Type-C, 2: Circular Hole (DC)         |
++----------+-----------------------+------------------------------------------+
+| 20       | MaxFanSpeedSwitch     | Byte 4: Fan Type (0: CPU/GPU, 1: SYS)    |
+|          |                       | Byte 5: State (0: Off, 1: On)            |
++----------+-----------------------+------------------------------------------+
+| 21       | MaxFanSpeed           | Sets manual fan speed duty cycle         |
++----------+-----------------------+------------------------------------------+
+| 22       | CPUThermometer        | Returns CPU Temperature                  |
++----------+-----------------------+------------------------------------------+
+
+WMI Events (HID_EVENT20)
+========================
+
+The driver listens for events from the ``HID_EVENT20`` class
+(GUID: ``{46c93e13-ee9b-4262-8488-563bca757fef}``). These events are triggered
+by hotkeys or system state changes (e.g., plugging in AC power).
+
+Event Structure
+---------------
+
+The event data is provided in an 8-byte array (``EventDetail``):
+
++----------+------------------------------------------------------------------+
+| Byte     | Description                                                      |
++==========+==================================================================+
+| 0        | Event Type (Always 0x01 for HotKey/Notification)                 |
++----------+------------------------------------------------------------------+
+| 1        | Event ID (Corresponds to the Command IDs above)                  |
++----------+------------------------------------------------------------------+
+| 2        | Value (The new state or value of the feature)                    |
++----------+------------------------------------------------------------------+
+
+Common Event IDs:
+-----------------
+
+Note: reserved event ids are not listed there
+
++----------+------------------------------------------------------------------+
+| Event Id | Description                                                      |
++==========+==================================================================+
+| 4        | AirPlane mode change                                             |
++----------+------------------------------------------------------------------+
+| 5        | Keyboard brightness change                                       |
++----------+------------------------------------------------------------------+
+| 6        | touchpad state (enabled/disabled) change                         |
++----------+------------------------------------------------------------------+
+| 7        | FnLock state (enabled/disabled) change                           |
++----------+------------------------------------------------------------------+
+| 8        | Keyboard mode change                                             |
++----------+------------------------------------------------------------------+
+| 9        | CapsLock state change                                            |
++----------+------------------------------------------------------------------+
+| 13       | NumLock state change                                             |
++----------+------------------------------------------------------------------+
+| 14       | ScrollLock state change                                          |
++----------+------------------------------------------------------------------+
+| 15       | Performance plan change                                          |
++----------+------------------------------------------------------------------+
+| 25       | Display refresh rate change                                      |
++----------+------------------------------------------------------------------+
+| 33       | Super key lock state (enabled/disabled) change                   |
++----------+------------------------------------------------------------------+
+| 35       | Open control center key                                          |
++----------+------------------------------------------------------------------+
+
+Implementation Details
+======================
+
+Performance Modes
+-----------------
+Changing the performance mode via Command ID 0x08 (SystemPerMode) affects the power limits (PL1/PL2)
+and fan curves managed by the Embedded Controller (EC). Note that the "Full-speed"
+and "Performance" mode (1, 3) is typically only available when the system is connected to a DC power
+source (not USB-C/PD).
+
+In the driver implementation, switch to performance/full-speed mode without DC power connected
+will throw the EOPNOTSUPP error.
+
+Graphics Switching
+------------------
+The ``GPUMode`` (0x09) allows switching between Hybrid (Muxless) and Discrete
+(Muxed) graphics. Changing this value usually requires a system reboot to
+take effect in the BIOS/Firmware.
+
+Fan Control
+-----------
+The system supports both automatic EC control and manual overrides. Command ID
+0x14 (``MaxFanSpeedSwitch``) is used to toggle manual control, while ID 0x15
+sets the actual PWM duty cycle.
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 4cb7d97a9fcc..1aa1f98b341d 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -113,6 +113,22 @@ config GIGABYTE_WMI
 	  To compile this driver as a module, choose M here: the module will
 	  be called gigabyte-wmi.
 
+config BITLAND_MIFS_WMI
+	tristate "Bitland MIFS (MiInterface) WMI driver"
+	depends on ACPI_WMI
+	depends on HWMON
+	depends on POWER_SUPPLY
+	select ACPI_PLATFORM_PROFILE
+	help
+	  This is a driver for Bitland MiInterface based laptops.
+
+	  It provides the access to the temperature, fan speed, gpu
+	  control, keyboard backlight brightness and platform profile
+	  via hwmon and sysfs.
+
+	  To compile this driver as a module, choose M here: the module will
+          be called bitland-mifs-wmi.
+
 config ACERHDF
 	tristate "Acer Aspire One temperature and fan driver"
 	depends on ACPI_EC && THERMAL
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index d25762f7114f..872ac3842391 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -14,6 +14,7 @@ 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
 
 # Acer
 obj-$(CONFIG_ACERHDF)		+= acerhdf.o
diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
new file mode 100644
index 000000000000..6500b9efb58b
--- /dev/null
+++ b/drivers/platform/x86/bitland-mifs-wmi.c
@@ -0,0 +1,851 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/acpi.h>
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/dev_printk.h>
+#include <linux/device.h>
+#include <linux/device/devres.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/input-event-codes.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/platform_profile.h>
+#include <linux/pm.h>
+#include <linux/power_supply.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/unaligned.h>
+#include <linux/units.h>
+#include <linux/wmi.h>
+
+#define DRV_NAME		"bitland-mifs-wmi"
+#define BITLAND_MIFS_GUID	"B60BFB48-3E5B-49E4-A0E9-8CFFE1B3434B"
+#define BITLAND_EVENT_GUID	"46C93E13-EE9B-4262-8488-563BCA757FEF"
+
+enum bitland_mifs_operation {
+	WMI_METHOD_GET	= 250,
+	WMI_METHOD_SET	= 251,
+};
+
+enum bitland_mifs_function {
+	WMI_FN_SYSTEM_PER_MODE		= 8,
+	WMI_FN_GPU_MODE			= 9,
+	WMI_FN_KBD_TYPE			= 10,
+	WMI_FN_FN_LOCK			= 11,
+	WMI_FN_TP_LOCK			= 12,
+	WMI_FN_FAN_SPEEDS		= 13,
+	WMI_FN_RGB_KB_MODE		= 16,
+	WMI_FN_RGB_KB_COLOR		= 17,
+	WMI_FN_RGB_KB_BRIGHTNESS	= 18,
+	WMI_FN_SYSTEM_AC_TYPE		= 19,
+	WMI_FN_MAX_FAN_SWITCH		= 20,
+	WMI_FN_MAX_FAN_SPEED		= 21,
+	WMI_FN_CPU_THERMOMETER		= 22,
+	WMI_FN_CPU_POWER		= 23,
+};
+
+enum bitland_system_ac_mode {
+	WMI_SYSTEM_AC_TYPEC		= 1,
+	/* Unknown type, this is unused in the original driver */
+	WMI_SYSTEM_AC_CIRCULARHOLE	= 2,
+};
+
+enum bitland_mifs_power_profile {
+	WMI_PP_BALANCED		= 0,
+	WMI_PP_PERFORMANCE	= 1,
+	WMI_PP_QUIET		= 2,
+	WMI_PP_FULL_SPEED	= 3,
+};
+
+enum bitland_mifs_event_id {
+	WMI_EVENT_RESERVED_1		= 1,
+	WMI_EVENT_RESERVED_2		= 2,
+	WMI_EVENT_RESERVED_3		= 3,
+	WMI_EVENT_AIRPLANE_MODE		= 4,
+	WMI_EVENT_KBD_BRIGHTNESS	= 5,
+	WMI_EVENT_TOUCHPAD_STATE	= 6,
+	WMI_EVENT_FNLOCK_STATE		= 7,
+	WMI_EVENT_KBD_MODE		= 8,
+	WMI_EVENT_CAPSLOCK_STATE	= 9,
+	WMI_EVENT_CALCULATOR_START	= 11,
+	WMI_EVENT_BROWSER_START		= 12,
+	WMI_EVENT_NUMLOCK_STATE		= 13,
+	WMI_EVENT_SCROLLLOCK_STATE	= 14,
+	WMI_EVENT_PERFORMANCE_PLAN	= 15,
+	WMI_EVENT_FN_J			= 16,
+	WMI_EVENT_FN_F			= 17,
+	WMI_EVENT_FN_0			= 18,
+	WMI_EVENT_FN_1			= 19,
+	WMI_EVENT_FN_2			= 20,
+	WMI_EVENT_FN_3			= 21,
+	WMI_EVENT_FN_4			= 22,
+	WMI_EVENT_FN_5			= 24,
+	WMI_EVENT_REFRESH_RATE		= 25,
+	WMI_EVENT_CPU_FAN_SPEED		= 26,
+	WMI_EVENT_GPU_FAN_SPEED		= 32,
+	WMI_EVENT_WIN_KEY_LOCK		= 33,
+	WMI_EVENT_RESERVED_23		= 34,
+	WMI_EVENT_OPEN_APP		= 35,
+};
+
+enum bitland_mifs_event_type {
+	WMI_EVENT_TYPE_HOTKEY	= 1,
+};
+
+enum bitland_wmi_device_type {
+	BITLAND_WMI_CONTROL	= 0,
+	BITLAND_WMI_EVENT	= 1,
+};
+
+struct bitland_mifs_input {
+	u8 reserved1;
+	u8 operation;
+	u8 reserved2;
+	u8 function;
+	u8 payload[28];
+} __packed;
+
+struct bitland_mifs_output {
+	u8 reserved1;
+	u8 operation;
+	u8 reserved2;
+	u8 function;
+	u8 data[28];
+} __packed;
+
+struct bitland_mifs_event {
+	u8 event_type;
+	u8 event_id;
+	u8 value_low;	/* For most events, this is the value */
+	u8 value_high;	/* For fan speed events, combined with value_low */
+	u8 reserved[4];
+} __packed;
+
+static ATOMIC_NOTIFIER_HEAD(bitland_notifier_list);
+
+enum bitland_notifier_actions {
+	BITLAND_NOTIFY_KBD_BRIGHTNESS,
+	BITLAND_NOTIFY_PLATFORM_PROFILE,
+	BITLAND_NOTIFY_HWMON,
+};
+
+struct bitland_fan_notify_data {
+	int channel; /* 0 = CPU, 1 = GPU */
+	u16 speed;
+};
+
+struct bitland_mifs_wmi_data {
+	struct wmi_device *wdev;
+	struct mutex lock; /* Protects WMI calls */
+	struct led_classdev kbd_led;
+	struct notifier_block notifier;
+	struct input_dev *input_dev;
+	struct device *hwmon_dev;
+	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 wmi_buffer in_buf = { .length = sizeof(*input), .data = (void *)input };
+	struct wmi_buffer out_buf = { 0 };
+	int ret;
+
+	guard(mutex)(&data->lock);
+
+	ret = wmidev_invoke_method(data->wdev, 0, 1, &in_buf, output ? &out_buf : NULL);
+	if (ret)
+		return ret;
+
+	if (output) {
+		if (out_buf.length < sizeof(*output)) {
+			kfree(out_buf.data);
+			return -EIO;
+		}
+
+		memcpy(output, out_buf.data, sizeof(*output));
+
+		kfree(out_buf.data);
+	}
+
+	return 0;
+}
+
+static int laptop_profile_get(struct device *dev,
+			      enum platform_profile_option *profile)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_GET,
+		.reserved2 = 0,
+		.function = WMI_FN_SYSTEM_PER_MODE,
+	};
+	struct bitland_mifs_output result;
+	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;
+	}
+	return 0;
+}
+
+static int bitland_check_performance_capability(struct bitland_mifs_wmi_data *data)
+{
+	struct bitland_mifs_input input = {
+		.operation = WMI_METHOD_GET,
+		.function = WMI_FN_SYSTEM_AC_TYPE,
+	};
+	struct bitland_mifs_output output;
+	int ret;
+
+	/* Full-speed/performance mode requires DC power (not USB-C) */
+	if (!power_supply_is_system_supplied())
+		return -EOPNOTSUPP;
+
+	ret = bitland_mifs_wmi_call(data, &input, &output);
+	if (ret)
+		return ret;
+
+	if (output.data[0] == WMI_SYSTEM_AC_TYPEC)
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static int laptop_profile_set(struct device *dev,
+			      enum platform_profile_option profile)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_SET,
+		.reserved2 = 0,
+		.function = WMI_FN_SYSTEM_PER_MODE,
+	};
+	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 (ret)
+			return ret;
+		val = WMI_PP_FULL_SPEED;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	input.payload[0] = val;
+
+	return bitland_mifs_wmi_call(data, &input, NULL);
+}
+
+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);
+
+	return 0;
+}
+
+static int bitland_mifs_wmi_suspend(struct device *dev)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	enum platform_profile_option profile;
+	int ret;
+
+	ret = laptop_profile_get(dev, &profile);
+	if (ret == 0)
+		data->saved_profile = profile;
+
+	return ret;
+}
+
+static int bitland_mifs_wmi_resume(struct device *dev)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "Resuming, restoring profile %d\n",
+		data->saved_profile);
+	return laptop_profile_set(dev, data->saved_profile);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(bitland_mifs_wmi_pm_ops,
+				bitland_mifs_wmi_suspend,
+				bitland_mifs_wmi_resume);
+
+static const struct platform_profile_ops laptop_profile_ops = {
+	.probe = platform_profile_probe,
+	.profile_get = laptop_profile_get,
+	.profile_set = laptop_profile_set,
+};
+
+static const char *const fan_labels[] = {
+	"CPU", /* 0 */
+	"GPU", /* 1 */
+	"SYS", /* 2 */
+};
+
+static int laptop_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+			     u32 attr, int channel, long *val)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_GET,
+		.reserved2 = 0,
+	};
+	struct bitland_mifs_output res;
+	int ret;
+
+	switch (type) {
+	case hwmon_temp:
+		input.function = WMI_FN_CPU_THERMOMETER;
+		ret = bitland_mifs_wmi_call(data, &input, &res);
+		if (!ret)
+			*val = res.data[0] * MILLIDEGREE_PER_DEGREE;
+		return ret;
+	case hwmon_fan:
+		input.function = WMI_FN_FAN_SPEEDS;
+		ret = bitland_mifs_wmi_call(data, &input, &res);
+		if (ret)
+			break;
+
+		switch (channel) {
+		case 0: /* CPU */
+			*val = get_unaligned_le16(&res.data[0]);
+			break;
+		case 1: /* GPU */
+			*val = get_unaligned_le16(&res.data[2]);
+			break;
+		case 2: /* SYS */
+			*val = get_unaligned_le16(&res.data[6]);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int laptop_hwmon_read_string(struct device *dev,
+				    enum hwmon_sensor_types type, u32 attr,
+				    int channel, const char **str)
+{
+	if (type == hwmon_fan && attr == hwmon_fan_label) {
+		if (channel >= 0 && channel < ARRAY_SIZE(fan_labels)) {
+			*str = fan_labels[channel];
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static const struct hwmon_channel_info *laptop_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
+	HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL,
+			   HWMON_F_INPUT | HWMON_F_LABEL),
+	NULL
+};
+
+static const struct hwmon_ops laptop_hwmon_ops = {
+	.visible = 0444,
+	.read = laptop_hwmon_read,
+	.read_string = laptop_hwmon_read_string,
+};
+
+static const struct hwmon_chip_info laptop_chip_info = {
+	.ops = &laptop_hwmon_ops,
+	.info = laptop_hwmon_info,
+};
+
+static int laptop_kbd_led_set(struct led_classdev *led_cdev,
+			      enum led_brightness value)
+{
+	struct bitland_mifs_wmi_data *data =
+		container_of(led_cdev, struct bitland_mifs_wmi_data, kbd_led);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_SET,
+		.reserved2 = 0,
+		.function = WMI_FN_RGB_KB_BRIGHTNESS,
+	};
+
+	input.payload[0] = (u8)value;
+
+	return bitland_mifs_wmi_call(data, &input, NULL);
+}
+
+static enum led_brightness laptop_kbd_led_get(struct led_classdev *led_cdev)
+{
+	struct bitland_mifs_wmi_data *data =
+		container_of(led_cdev, struct bitland_mifs_wmi_data, kbd_led);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_GET,
+		.reserved2 = 0,
+		.function = WMI_FN_RGB_KB_BRIGHTNESS,
+	};
+	struct bitland_mifs_output res;
+	int ret;
+
+	ret = bitland_mifs_wmi_call(data, &input, &res);
+	if (ret)
+		return ret;
+
+	return res.data[0];
+}
+
+static const char *const gpu_mode_strings[] = {
+	"hybrid",
+	"discrete",
+	"uma",
+};
+
+/* GPU Mode: 0:Hybrid, 1:Discrete, 2:UMA */
+static ssize_t gpu_mode_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_GET,
+		.reserved2 = 0,
+		.function = WMI_FN_GPU_MODE,
+	};
+	struct bitland_mifs_output res;
+	u8 mode_val;
+	int ret;
+
+	ret = bitland_mifs_wmi_call(data, &input, &res);
+
+	if (ret)
+		return ret;
+
+	mode_val = res.data[0];
+
+	if (mode_val >= ARRAY_SIZE(gpu_mode_strings))
+		return -EPROTO;
+
+	return sysfs_emit(buf, "%s\n", gpu_mode_strings[mode_val]);
+}
+
+static ssize_t gpu_mode_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_SET,
+		.reserved2 = 0,
+		.function = WMI_FN_GPU_MODE,
+	};
+	int val;
+	int ret;
+
+	val = sysfs_match_string(gpu_mode_strings, buf);
+	if (val < 0)
+		return -EINVAL;
+
+	input.payload[0] = (u8)val;
+
+	ret = bitland_mifs_wmi_call(data, &input, NULL);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static const char *const kb_mode_strings[] = {
+	"off",		/* 0 */
+	"cyclic",	/* 1 */
+	"fixed",	/* 2 */
+	"custom",	/* 3 */
+};
+
+static ssize_t kb_mode_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_GET,
+		.reserved2 = 0,
+		.function = WMI_FN_RGB_KB_MODE,
+	};
+	struct bitland_mifs_output res;
+	int ret;
+	u8 mode_val;
+
+	ret = bitland_mifs_wmi_call(data, &input, &res);
+	if (ret)
+		return ret;
+
+	mode_val = res.data[0];
+
+	if (mode_val >= ARRAY_SIZE(kb_mode_strings))
+		return -EPROTO;
+
+	return sysfs_emit(buf, "%s\n", kb_mode_strings[mode_val]);
+}
+
+static ssize_t kb_mode_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_SET,
+		.reserved2 = 0,
+		.function = WMI_FN_RGB_KB_MODE,
+	};
+	// the wmi value (0, 1, 2 or 3)
+	int val;
+	int ret;
+
+	if (!data)
+		return -EINVAL;
+
+	val = sysfs_match_string(kb_mode_strings, buf);
+	if (val < 0)
+		return -EINVAL;
+
+	input.payload[0] = (u8)val;
+
+	ret = bitland_mifs_wmi_call(data, &input, NULL);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+/* Fan Boost: 0:Normal, 1:Max Speed */
+static ssize_t fan_boost_store(struct device *dev,
+			       struct device_attribute *attr, const char *buf,
+			       size_t count)
+{
+	struct bitland_mifs_wmi_data *data = dev_get_drvdata(dev);
+	struct bitland_mifs_input input = {
+		.reserved1 = 0,
+		.operation = WMI_METHOD_SET,
+		.reserved2 = 0,
+		.function = WMI_FN_MAX_FAN_SWITCH,
+	};
+	bool val;
+	int ret;
+
+	if (!data)
+		return -EINVAL;
+
+	if (kstrtobool(buf, &val))
+		return -EINVAL;
+
+	input.payload[0] = 0;	/* CPU/GPU Fan */
+	input.payload[1] = val;
+
+	ret = bitland_mifs_wmi_call(data, &input, NULL);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(gpu_mode);
+static DEVICE_ATTR_RW(kb_mode);
+static DEVICE_ATTR_WO(fan_boost);
+
+static struct attribute *laptop_attrs[] = {
+	&dev_attr_gpu_mode.attr,
+	&dev_attr_kb_mode.attr,
+	&dev_attr_fan_boost.attr,
+	NULL,
+};
+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 }
+};
+
+static void bitland_notifier_unregister(void *data)
+{
+	struct notifier_block *nb = data;
+
+	atomic_notifier_chain_unregister(&bitland_notifier_list, nb);
+}
+
+static int bitland_notifier_callback(struct notifier_block *nb,
+				      unsigned long action, void *data)
+{
+	struct bitland_mifs_wmi_data *data_ctx =
+	container_of(nb, struct bitland_mifs_wmi_data, notifier);
+	struct bitland_fan_notify_data *fan_info;
+	u8 *brightness;
+
+	switch (action) {
+	case BITLAND_NOTIFY_KBD_BRIGHTNESS:
+		brightness = data;
+		led_classdev_notify_brightness_hw_changed(&data_ctx->kbd_led,
+							  *brightness);
+		break;
+	case BITLAND_NOTIFY_PLATFORM_PROFILE:
+		platform_profile_notify(&data_ctx->wdev->dev);
+		break;
+	case BITLAND_NOTIFY_HWMON:
+		fan_info = data;
+		if (!fan_info)
+			return NOTIFY_DONE;
+
+		hwmon_notify_event(data_ctx->hwmon_dev,
+				   hwmon_fan,
+				   hwmon_fan_input,
+				   fan_info->channel);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static int bitland_mifs_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+	struct bitland_mifs_wmi_data *drv_data;
+	struct device *pp_dev;
+	enum bitland_wmi_device_type dev_type =
+		(enum bitland_wmi_device_type)(unsigned long)context;
+	int ret;
+
+	drv_data = devm_kzalloc(&wdev->dev, sizeof(*drv_data), GFP_KERNEL);
+	if (!drv_data)
+		return -ENOMEM;
+
+	drv_data->wdev = wdev;
+
+	ret = devm_mutex_init(&wdev->dev, &drv_data->lock);
+	if (ret)
+		return ret;
+
+	dev_set_drvdata(&wdev->dev, drv_data);
+
+	if (dev_type == BITLAND_WMI_EVENT) {
+		/* Register input device for hotkeys */
+		drv_data->input_dev = devm_input_allocate_device(&wdev->dev);
+		if (!drv_data->input_dev)
+			return -ENOMEM;
+
+		drv_data->input_dev->name = "Bitland MIFS WMI hotkeys";
+		drv_data->input_dev->phys = "wmi/input0";
+		drv_data->input_dev->id.bustype = BUS_HOST;
+		drv_data->input_dev->dev.parent = &wdev->dev;
+
+		ret = sparse_keymap_setup(drv_data->input_dev,
+					  bitland_mifs_wmi_keymap, NULL);
+		if (ret)
+			return ret;
+
+		ret = input_register_device(drv_data->input_dev);
+		if (ret)
+			return ret;
+
+		return 0;
+	}
+
+	/* Register platform profile */
+	pp_dev = devm_platform_profile_register(&wdev->dev, DRV_NAME, drv_data,
+						&laptop_profile_ops);
+	if (IS_ERR(pp_dev))
+		return PTR_ERR(pp_dev);
+
+	drv_data->saved_profile = PLATFORM_PROFILE_LAST;
+
+	/* Register hwmon */
+	drv_data->hwmon_dev = devm_hwmon_device_register_with_info(&wdev->dev, "bitland_mifs",
+								   drv_data, &laptop_chip_info, NULL);
+	if (IS_ERR(drv_data->hwmon_dev))
+		return PTR_ERR(drv_data->hwmon_dev);
+
+	/* Register keyboard LED */
+	drv_data->kbd_led.name = "laptop::kbd_backlight";
+
+	drv_data->kbd_led.max_brightness = 3;
+	drv_data->kbd_led.brightness_set_blocking = laptop_kbd_led_set;
+	drv_data->kbd_led.brightness_get = laptop_kbd_led_get;
+	ret = devm_led_classdev_register(&wdev->dev, &drv_data->kbd_led);
+	if (ret)
+		return ret;
+
+	drv_data->notifier.notifier_call = bitland_notifier_callback;
+	ret = atomic_notifier_chain_register(&bitland_notifier_list, &drv_data->notifier);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(&wdev->dev, bitland_notifier_unregister, &drv_data->notifier);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+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;
+	struct bitland_fan_notify_data fan_data;
+	u8 brightness;
+
+	if (buffer->length < sizeof(*event))
+		return;
+
+	event = (const struct bitland_mifs_event *)buffer->data;
+
+	/* Validate event type */
+	if (event->event_type != WMI_EVENT_TYPE_HOTKEY)
+		return;
+
+	dev_dbg(&wdev->dev,
+		"WMI event: id=0x%02x value_low=0x%02x value_high=0x%02x\n",
+		event->event_id, event->value_low, event->value_high);
+
+	switch (event->event_id) {
+	case WMI_EVENT_KBD_BRIGHTNESS:
+		brightness = event->value_low;
+		atomic_notifier_call_chain(&bitland_notifier_list,
+					   BITLAND_NOTIFY_KBD_BRIGHTNESS,
+					   &brightness);
+		break;
+
+	case WMI_EVENT_PERFORMANCE_PLAN:
+		atomic_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:
+		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;
+
+	/*
+	 * The device has 3 fans (CPU, GPU, SYS),
+	 * but there are only the CPU and GPU fan has events
+	 */
+	case WMI_EVENT_CPU_FAN_SPEED:
+	case WMI_EVENT_GPU_FAN_SPEED:
+		if (event->event_id == WMI_EVENT_CPU_FAN_SPEED)
+			fan_data.channel = 0;
+		else
+			fan_data.channel = 1;
+
+		/* Fan speed is 16-bit value (value_low is LSB, value_high is MSB) */
+		fan_data.speed = (event->value_high << 8) | event->value_low;
+		atomic_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;
+
+	default:
+		dev_dbg(&wdev->dev, "Unknown event: id=0x%02x value=0x%02x\n",
+			event->event_id, event->value_low);
+		break;
+	}
+}
+
+static const struct wmi_device_id bitland_mifs_wmi_id_table[] = {
+	{ BITLAND_MIFS_GUID, (void *)BITLAND_WMI_CONTROL },
+	{ BITLAND_EVENT_GUID, (void *)BITLAND_WMI_EVENT },
+	{}
+};
+MODULE_DEVICE_TABLE(wmi, bitland_mifs_wmi_id_table);
+
+static struct wmi_driver bitland_mifs_wmi_driver = {
+	.no_singleton = true,
+	.driver = {
+		.name = DRV_NAME,
+		.dev_groups = laptop_groups,
+		.pm = pm_sleep_ptr(&bitland_mifs_wmi_pm_ops),
+	},
+	.id_table = bitland_mifs_wmi_id_table,
+	.probe = bitland_mifs_wmi_probe,
+	.notify_new = bitland_mifs_wmi_notify,
+};
+
+module_wmi_driver(bitland_mifs_wmi_driver);
+
+MODULE_AUTHOR("Mingyou Chen <qby140326@xxxxxxxxx>");
+MODULE_DESCRIPTION("Bitland MIFS (MiInterface) WMI driver");
+MODULE_LICENSE("GPL");
-- 
2.51.2