Input: gpio_keys - defer probing if GPIO probing is deferred

[~andy/linux] / drivers / input / matrix-keymap.c

diff --git a/drivers/input/matrix-keymap.c b/drivers/input/matrix-keymap.c
index 443ad64b7f2a2344ff6e8801dfe2c7f0a1e0a0a1..3ae496ea5fe6b52d6620443d937dd3ea5bbda44e 100644 (file)
--- a/drivers/input/matrix-keymap.c
+++ b/drivers/input/matrix-keymap.c
@@ -18,11 +18,13 @@
  */
 
 #include <linux/device.h>
+#include <linux/gfp.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/input.h>
 #include <linux/of.h>
 #include <linux/export.h>
+#include <linux/module.h>
 #include <linux/input/matrix_keypad.h>
 
 static bool matrix_keypad_map_key(struct input_dev *input_dev,
@@ -122,6 +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.
  */
@@ -132,12 +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);
 
@@ -161,3 +183,5 @@ int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
        return 0;
 }
 EXPORT_SYMBOL(matrix_keypad_build_keymap);
+
+MODULE_LICENSE("GPL");