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path: root/drivers/input/matrix-keymap.c
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Diffstat (limited to 'drivers/input/matrix-keymap.c')
-rw-r--r--drivers/input/matrix-keymap.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/input/matrix-keymap.c b/drivers/input/matrix-keymap.c
index d88d9be..3ae496e 100644
--- a/drivers/input/matrix-keymap.c
+++ b/drivers/input/matrix-keymap.c
@@ -18,6 +18,7 @@
*/
#include <linux/device.h>
+#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/input.h>
@@ -123,6 +124,11 @@ static int matrix_keypad_parse_of_keymap(const char *propname,
* it will attempt load the keymap from property specified by @keymap_name
* argument (or "linux,keymap" if @keymap_name is %NULL).
*
+ * If @keymap is %NULL the function will automatically allocate managed
+ * block of memory to store the keymap. This memory will be associated with
+ * the parent device and automatically freed when device unbinds from the
+ * driver.
+ *
* Callers are expected to set up input_dev->dev.parent before calling this
* function.
*/
@@ -133,12 +139,27 @@ int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
struct input_dev *input_dev)
{
unsigned int row_shift = get_count_order(cols);
+ size_t max_keys = rows << row_shift;
int i;
int error;
+ if (WARN_ON(!input_dev->dev.parent))
+ return -EINVAL;
+
+ if (!keymap) {
+ keymap = devm_kzalloc(input_dev->dev.parent,
+ max_keys * sizeof(*keymap),
+ GFP_KERNEL);
+ if (!keymap) {
+ dev_err(input_dev->dev.parent,
+ "Unable to allocate memory for keymap");
+ return -ENOMEM;
+ }
+ }
+
input_dev->keycode = keymap;
input_dev->keycodesize = sizeof(*keymap);
- input_dev->keycodemax = rows << row_shift;
+ input_dev->keycodemax = max_keys;
__set_bit(EV_KEY, input_dev->evbit);
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