Transition to the new wmi_buffer based WMI API.

Signed-off-by: Kurt Borja <kuurtb@gmail.com>
---
v3:
  - Use __free() instead of manual cleanup.
  - Include <linux/types.h>

v2: https://patch.msgid.link/20260331-aw-new-api-v2-1-3b0d33bf8d22@gmail.com
  - Cast wmi_buffer data to __le32 and then use le32_to_cpu() before
    returning

v1: https://patch.msgid.link/20260330-aw-new-api-v1-1-95910bfa1b38@gmail.com
---
 drivers/platform/x86/dell/alienware-wmi-base.c | 34 ++++++++++++++++----------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/platform/x86/dell/alienware-wmi-base.c b/drivers/platform/x86/dell/alienware-wmi-base.c
index 64562b92314f..38a903734fa3 100644
--- a/drivers/platform/x86/dell/alienware-wmi-base.c
+++ b/drivers/platform/x86/dell/alienware-wmi-base.c
@@ -12,8 +12,13 @@
 #include <linux/cleanup.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
 #include <linux/dmi.h>
 #include <linux/leds.h>
+
+#include <asm/byteorder.h>
+
 #include "alienware-wmi.h"
 
 MODULE_AUTHOR("Mario Limonciello <mario.limonciello@outlook.com>");
@@ -150,22 +155,25 @@ u8 alienware_interface;
 int alienware_wmi_command(struct wmi_device *wdev, u32 method_id,
 			  void *in_args, size_t in_size, u32 *out_data)
 {
-	struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
-	struct acpi_buffer in = {in_size, in_args};
-	acpi_status ret;
+	struct wmi_buffer out, in = {
+		.data = in_args,
+		.length = in_size,
+	};
+	int ret;
 
-	ret = wmidev_evaluate_method(wdev, 0, method_id, &in, out_data ? &out : NULL);
-	if (ACPI_FAILURE(ret))
-		return -EIO;
+	ret = wmidev_invoke_method(wdev, 0, method_id, &in, out_data ? &out : NULL);
+	if (ret)
+		return ret;
 
-	union acpi_object *obj __free(kfree) = out.pointer;
+	if (!out_data)
+		return 0;
 
-	if (out_data) {
-		if (obj && obj->type == ACPI_TYPE_INTEGER)
-			*out_data = (u32)obj->integer.value;
-		else
-			return -ENOMSG;
-	}
+	__le32 *data __free(kfree) = out.data;
+
+	if (out.length < sizeof(*out_data))
+		return -ENOMSG;
+
+	*out_data = le32_to_cpu(*data);
 
 	return 0;
 }

---
base-commit: fab7c51693e95aa874d6d9db22bfae7bd0b23c66
change-id: 20260123-aw-new-api-1c18f1011f35

-- 
Thanks, 
 ~ Kurt