linux-kernel - [PATCH 2/2] platform/x86: export thinkpad

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Message-ID: <20250507190456.3004367-2-mpearson-lenovo@squebb.ca>
Date: Wed,  7 May 2025 15:04:35 -0400
From: Mark Pearson <mpearson-lenovo@...ebb.ca>
To: mpearson-lenovo@...ebb.ca
Cc: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	ikepanhc@...il.com,
	W_Armin@....de,
	andriy.shevchenko@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	ibm-acpi-devel@...ts.sourceforge.net
Subject: [PATCH 2/2] platform/x86: export thinkpad_acpi handles

Add API to be able to get the thinkpad_acpi various handles.

Will use this to start pulling some of the thinkpad_acpi functionality
into separate modules in the future.

Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
---
 drivers/platform/x86/lenovo/thinkpad_acpi.c | 18 ++++++++++++++++++
 include/linux/thinkpad_acpi.h               | 17 +++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 include/linux/thinkpad_acpi.h

diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform/x86/lenovo/thinkpad_acpi.c
index 7dd4abf47f61..0eb33b4c99cf 100644
--- a/drivers/platform/x86/lenovo/thinkpad_acpi.c
+++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c
@@ -67,6 +67,7 @@
 #include <linux/string.h>
 #include <linux/string_helpers.h>
 #include <linux/sysfs.h>
+#include <linux/thinkpad_acpi.h>
 #include <linux/types.h>
 #include <linux/uaccess.h>
 #include <linux/units.h>
@@ -606,6 +607,23 @@ TPACPI_HANDLE(hkey, ec, "\\_SB.HKEY",	/* 600e/x, 770e, 770x */
  * ACPI helpers
  */
 
+int tp_acpi_get_handle(enum tp_acpi_handle_id handle_id, acpi_handle *handle)
+{
+	switch (handle_id) {
+	case TP_ROOT_HANDLE:
+		*handle = root_handle;
+		return 0;
+	case TP_EC_HANDLE:
+		*handle = ec_handle;
+		return 0;
+	case TP_HKEY_HANDLE:
+		*handle = hkey_handle;
+		return 0;
+	}
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(tp_acpi_get_handle);
+
 static int acpi_evalf(acpi_handle handle,
 		      int *res, char *method, char *fmt, ...)
 {
diff --git a/include/linux/thinkpad_acpi.h b/include/linux/thinkpad_acpi.h
new file mode 100644
index 000000000000..eb5273464658
--- /dev/null
+++ b/include/linux/thinkpad_acpi.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Thinkpad ACPI driver API
+ */
+
+#ifndef _TP_ACPI_H_
+#define _TP_ACPI_H_
+
+enum tp_acpi_handle_id {
+	TP_ROOT_HANDLE,
+	TP_EC_HANDLE,
+	TP_HKEY_HANDLE,
+};
+
+int tp_acpi_get_handle(enum tp_acpi_handle_id handle_id, acpi_handle *handle);
+
+#endif /* _TP_ACPI_H */
-- 
2.43.0