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input: Allow key ghosting filter to be disabled

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Some keyboards will not need a key ghosting filter, so make this feature
optional.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2012-09-27 15:18:42 +00:00 • committed by Tom Rini
parent 1b1d3e6461
commit 71dc6bca4e
3 changed files with 12 additions and 4 deletions
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9
drivers/input/key_matrix.c
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@ -46,6 +46,9 @@ static int has_ghosting(struct key_matrix *config, struct key_matrix_key *keys,
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 @@ int key_matrix_decode(struct key_matrix *config, struct key_matrix_key keys[],
}
/* 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 @@ int key_matrix_decode_fdt(struct key_matrix *config, const void *blob,
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;