[PATCH v2 4/7] Input: mt6779-keypad - prepare double keys support with calc_row_col

[Mattijs Korpershoek <mkorpershoek@baylibre.com>]

The MediaTek keypad can operate in two modes: single key or double key.
The driver only supports single key mode. In double key mode, the
row/column calculation based on the key is different.

Add a calc_row_col function pointer which will be different based on
single/double key mode.

No functional change.

Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

diff --git a/drivers/input/keyboard/mt6779-keypad.c b/drivers/input/keyboard/mt6779-keypad.c
index bf447bf598fb..39c931974bde 100644
--- a/drivers/input/keyboard/mt6779-keypad.c
+++ b/drivers/input/keyboard/mt6779-keypad.c
@@ -31,6 +31,7 @@ struct mt6779_keypad {
 	struct clk *clk;
 	u32 n_rows;
 	u32 n_cols;
+	void (*calc_row_col)(unsigned int key, unsigned int *row, unsigned int *col);
 	DECLARE_BITMAP(keymap_state, MTK_KPD_NUM_BITS);
 };
 
@@ -67,8 +68,7 @@ static irqreturn_t mt6779_keypad_irq_handler(int irq, void *dev_id)
 			continue;
 
 		key = bit_nr / 32 * 16 + bit_nr % 32;
-		row = key / 9;
-		col = key % 9;
+		keypad->calc_row_col(key, &row, &col);
 
 		scancode = MATRIX_SCAN_CODE(row, col, row_shift);
 		/* 1: not pressed, 0: pressed */
@@ -94,6 +94,14 @@ static void mt6779_keypad_clk_disable(void *data)
 	clk_disable_unprepare(data);
 }
 
+static void mt6779_keypad_calc_row_col_single(unsigned int key,
+					      unsigned int *row,
+					      unsigned int *col)
+{
+	*row = key / 9;
+	*col = key % 9;
+}
+
 static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
 {
 	struct mt6779_keypad *keypad;
@@ -148,6 +156,8 @@ static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	keypad->calc_row_col = mt6779_keypad_calc_row_col_single;
+
 	wakeup = device_property_read_bool(&pdev->dev, "wakeup-source");
 
 	dev_dbg(&pdev->dev, "n_row=%d n_col=%d debounce=%d\n",

-- 
b4 0.10.0-dev-78725