[PATCH 1/7] Input: export input_default_setkeycode

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

From: Fabio Baltieri <fabiobaltieri@chromium.org>

Export input_default_setkeycode so that a driver can set a custom
setkeycode handler to take some driver specific action but still call
the default handler at some point.

Signed-off-by: Fabio Baltieri <fabiobaltieri@chromium.org>
Link: https://patch.msgid.link/20260211173421.1206478-2-fabiobaltieri@chromium.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/input.c | 23 ++++++++++++++++++++---
 include/linux/input.h |  4 ++++
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index ceb134044175..9336980ee320 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -861,14 +861,30 @@ static int input_default_getkeycode(struct input_dev *dev,
 	return 0;
 }
 
-static int input_default_setkeycode(struct input_dev *dev,
-				    const struct input_keymap_entry *ke,
-				    unsigned int *old_keycode)
+/**
+ * input_default_setkeycode - default setkeycode method
+ * @dev: input device which keymap is being updated.
+ * @ke: new keymap entry.
+ * @old_keycode: pointer to the location where old keycode should be stored.
+ *
+ * This function is the default implementation of &input_dev.setkeycode()
+ * method. It is typically used when a driver does not provide its own
+ * implementation, but it is also exported so drivers can extend it.
+ *
+ * The function must be called with &input_dev.event_lock held.
+ *
+ * Return: 0 on success, or a negative error code on failure.
+ */
+int input_default_setkeycode(struct input_dev *dev,
+			     const struct input_keymap_entry *ke,
+			     unsigned int *old_keycode)
 {
 	unsigned int index;
 	int error;
 	int i;
 
+	lockdep_assert_held(&dev->event_lock);
+
 	if (!dev->keycodesize)
 		return -EINVAL;
 
@@ -922,6 +938,7 @@ static int input_default_setkeycode(struct input_dev *dev,
 	__set_bit(ke->keycode, dev->keybit);
 	return 0;
 }
+EXPORT_SYMBOL(input_default_setkeycode);
 
 /**
  * input_get_keycode - retrieve keycode currently mapped to a given scancode
diff --git a/include/linux/input.h b/include/linux/input.h
index 7d7cb0593a63..06ca62328db1 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -517,6 +517,10 @@ INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
 			     unsigned int *scancode);
 
+int input_default_setkeycode(struct input_dev *dev,
+			     const struct input_keymap_entry *ke,
+			     unsigned int *old_keycode);
+
 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
 int input_set_keycode(struct input_dev *dev,
 		      const struct input_keymap_entry *ke);
-- 
2.53.0.345.g96ddfc5eaa-goog