input: Allow key ghosting filter to be disabled
Some keyboards will not need a key ghosting filter, so make this feature
optional.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/input/key_matrix.c b/drivers/input/key_matrix.c
index c08caa6..287bf0d 100644
--- a/drivers/input/key_matrix.c
+++ b/drivers/input/key_matrix.c
@@ -46,6 +46,9 @@
int key_in_same_col = 0, key_in_same_row = 0;
int i, j;
+ if (!config->ghost_filter || valid < 3)
+ return 0;
+
for (i = 0; i < valid; i++) {
/*
* Find 2 keys such that one key is in the same row
@@ -92,7 +95,7 @@
}
/* For a ghost key config, ignore the keypresses for this iteration. */
- if (valid >= 3 && has_ghosting(config, keys, valid)) {
+ if (has_ghosting(config, keys, valid)) {
valid = 0;
debug(" ghosting detected!\n");
}
@@ -200,12 +203,14 @@
return 0;
}
-int key_matrix_init(struct key_matrix *config, int rows, int cols)
+int key_matrix_init(struct key_matrix *config, int rows, int cols,
+ int ghost_filter)
{
memset(config, '\0', sizeof(*config));
config->num_rows = rows;
config->num_cols = cols;
config->key_count = rows * cols;
+ config->ghost_filter = ghost_filter;
assert(config->key_count > 0);
return 0;