Input: max7359_keypad - switch to using matrix_keypad_build_keymap()

max7359_build_keycode() does the same thing as matrix_keypad_build_keymap(),
but the latter can also handle DT bindings.

Tested on beagleboard-xm.
Signed-off-by: Evgeniy A. Dushistov <dushistov@mail.ru>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/Kconfig

@@ -367,6 +367,7 @@ config KEYBOARD_MAPLE
 
 config KEYBOARD_MAX7359
 	tristate "Maxim MAX7359 Key Switch Controller"
+	select INPUT_MATRIXKMAP
 	depends on I2C
 	help
 	  If you say yes here you get support for the Maxim MAX7359 Key

drivers/input/keyboard/max7359_keypad.c

@@ -84,26 +84,6 @@ static int max7359_read_reg(struct i2c_client *client, int reg)
 	return ret;
 }
 
-static void max7359_build_keycode(struct max7359_keypad *keypad,
-				const struct matrix_keymap_data *keymap_data)
-{
-	struct input_dev *input_dev = keypad->input_dev;
-	int i;
-
-	for (i = 0; i < keymap_data->keymap_size; i++) {
-		unsigned int key = keymap_data->keymap[i];
-		unsigned int row = KEY_ROW(key);
-		unsigned int col = KEY_COL(key);
-		unsigned int scancode = MATRIX_SCAN_CODE(row, col,
-						MAX7359_ROW_SHIFT);
-		unsigned short keycode = KEY_VAL(key);
-
-		keypad->keycodes[scancode] = keycode;
-		__set_bit(keycode, input_dev->keybit);
-	}
-	__clear_bit(KEY_RESERVED, input_dev->keybit);
-}
-
 /* runs in an IRQ thread -- can (and will!) sleep */
 static irqreturn_t max7359_interrupt(int irq, void *dev_id)
 {
@@ -232,7 +212,15 @@ static int max7359_probe(struct i2c_client *client,
 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 	input_set_drvdata(input_dev, keypad);
 
-	max7359_build_keycode(keypad, keymap_data);
+	error = matrix_keypad_build_keymap(keymap_data, NULL,
+					   MAX7359_MAX_KEY_ROWS,
+					   MAX7359_MAX_KEY_COLS,
+					   keypad->keycodes,
+					   input_dev);
+	if (error) {
+		dev_err(&client->dev, "failed to build keymap\n");
+		return error;
+	}
 
 	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 					  max7359_interrupt,