Re: [PATCH v5 2/6] platform/x86: bitland-mifs-wmi: Merge the function of redmi-wmi into the bitland driver

[Ilya Gladyshev <ilya.gladyshev@linux.dev>]

Thank you for your patch. I have tested it on my Redmi Book Pro 15 2022, 
and everything works as expected, so

Tested-by: Ilya Gladyshev <ilya.gladyshev@linux.dev>

On 8/16/26 13:08, Mingyou Chen wrote:
> 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>
> Signed-off-by: Mingyou Chen <qby140326@gmail.com>
> ---
>   drivers/platform/x86/bitland-mifs-wmi.c | 139 ++++++++++++++++--------
>   1 file changed, 96 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/platform/x86/bitland-mifs-wmi.c b/drivers/platform/x86/bitland-mifs-wmi.c
> index b0d06a80e89e..8b6476881de6 100644
> --- a/drivers/platform/x86/bitland-mifs-wmi.c
> +++ b/drivers/platform/x86/bitland-mifs-wmi.c
> @@ -34,6 +34,11 @@
>   #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)
> +
 > ...> +
> +	/* 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 } },

Why empty line between two KEY_ASSISTANT mappings?

>   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;
> +	u32 payload;
>   	u8 brightness;
>   
>   	/* Validate event type */
> @@ -752,24 +821,13 @@ 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:
>   		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),
> @@ -777,6 +835,14 @@ 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
> @@ -787,27 +853,14 @@ 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);
>   		break;
>   	}
> +
> +	payload = get_unaligned_le32(buffer->data);
> +	bitland_mifs_wmi_report_key(wdev, payload);
>   }

[nitpick]
Would it make sense to place this inside the `default` case? That might 
make the control flow simpler (no break->return changes, everything 
still happens in the switch).

>   static const struct wmi_device_id bitland_mifs_wmi_id_table[] = {

---
Ilya Gladyshev // foxido.dev