[PATCH 10/14] Input: samsung-keypad - handle compact binding

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Add support for standard matrix keymap binding (in addition to the
existing verbose binding with a sub-node for each key). This will
allow easier conversions from platform data to device properties when
using static device properties.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/samsung-keypad.c | 122 +++++++++++++-----------
 1 file changed, 64 insertions(+), 58 deletions(-)

diff --git a/drivers/input/keyboard/samsung-keypad.c b/drivers/input/keyboard/samsung-keypad.c
index e262137b6838..df2427ac63d7 100644
--- a/drivers/input/keyboard/samsung-keypad.c
+++ b/drivers/input/keyboard/samsung-keypad.c
@@ -231,78 +231,85 @@ static void samsung_keypad_close(struct input_dev *input_dev)
 	samsung_keypad_stop(keypad);
 }
 
-#ifdef CONFIG_OF
-static struct samsung_keypad_platdata *
-samsung_keypad_parse_dt(struct device *dev)
+static const struct matrix_keymap_data *
+samsung_parse_verbose_keymap(struct device *dev)
 {
-	struct samsung_keypad_platdata *pdata;
 	struct matrix_keymap_data *keymap_data;
-	uint32_t *keymap, num_rows = 0, num_cols = 0;
-	struct device_node *np = dev->of_node, *key_np;
+	struct fwnode_handle *child;
+	u32 *keymap;
 	unsigned int key_count;
 
-	if (!np) {
-		dev_err(dev, "missing device tree data\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
-	if (!pdata) {
-		dev_err(dev, "could not allocate memory for platform data\n");
-		return ERR_PTR(-ENOMEM);
-	}
-
-	of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
-	of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
-	if (!num_rows || !num_cols) {
-		dev_err(dev, "number of keypad rows/columns not specified\n");
-		return ERR_PTR(-EINVAL);
-	}
-	pdata->rows = num_rows;
-	pdata->cols = num_cols;
-
 	keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
 	if (!keymap_data) {
 		dev_err(dev, "could not allocate memory for keymap data\n");
 		return ERR_PTR(-ENOMEM);
 	}
-	pdata->keymap_data = keymap_data;
 
-	key_count = of_get_child_count(np);
-	keymap_data->keymap_size = key_count;
-	keymap = devm_kcalloc(dev, key_count, sizeof(uint32_t), GFP_KERNEL);
+	key_count = device_get_child_node_count(dev);
+	keymap = devm_kcalloc(dev, key_count, sizeof(*keymap), GFP_KERNEL);
 	if (!keymap) {
 		dev_err(dev, "could not allocate memory for keymap\n");
 		return ERR_PTR(-ENOMEM);
 	}
+
+	keymap_data->keymap_size = key_count;
 	keymap_data->keymap = keymap;
 
-	for_each_child_of_node(np, key_np) {
+	device_for_each_child_node(dev, child) {
 		u32 row, col, key_code;
-		of_property_read_u32(key_np, "keypad,row", &row);
-		of_property_read_u32(key_np, "keypad,column", &col);
-		of_property_read_u32(key_np, "linux,code", &key_code);
+
+		fwnode_property_read_u32(child, "keypad,row", &row);
+		fwnode_property_read_u32(child, "keypad,column", &col);
+		fwnode_property_read_u32(child, "linux,code", &key_code);
+
 		*keymap++ = KEY(row, col, key_code);
 	}
 
-	pdata->no_autorepeat = of_property_read_bool(np, "linux,input-no-autorepeat");
+	return keymap_data;
+}
 
-	pdata->wakeup = of_property_read_bool(np, "wakeup-source") ||
-			/* legacy name */
-			of_property_read_bool(np, "linux,input-wakeup");
+static const struct samsung_keypad_platdata *
+samsung_keypad_parse_properties(struct device *dev)
+{
+	const struct matrix_keymap_data *keymap_data;
+	struct samsung_keypad_platdata *pdata;
+	u32 num_rows = 0, num_cols = 0;
+	int error;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(dev, "could not allocate memory for platform data\n");
+		return ERR_PTR(-ENOMEM);
+	}
 
+	device_property_read_u32(dev, "samsung,keypad-num-rows", &num_rows);
+	device_property_read_u32(dev, "samsung,keypad-num-columns", &num_cols);
+
+	error = matrix_keypad_parse_properties(dev, &num_rows, &num_cols);
+	if (error)
+		return ERR_PTR(error);
+
+	pdata->rows = num_rows;
+	pdata->cols = num_cols;
+
+	if (!device_property_present(dev, "linux,keymap")) {
+		keymap_data = samsung_parse_verbose_keymap(dev);
+		if (IS_ERR(keymap_data))
+			return ERR_CAST(keymap_data);
+
+		pdata->keymap_data = keymap_data;
+	}
 
-	return pdata;
-}
-#else
-static struct samsung_keypad_platdata *
-samsung_keypad_parse_dt(struct device *dev)
-{
-	dev_err(dev, "no platform data defined\n");
 
-	return ERR_PTR(-EINVAL);
+	pdata->no_autorepeat =
+		device_property_read_bool(dev, "linux,input-no-autorepeat");
+
+	pdata->wakeup = device_property_read_bool(dev, "wakeup-source") ||
+			/* legacy name */
+			device_property_read_bool(dev, "linux,input-wakeup");
+
+	return pdata;
 }
-#endif
 
 static void samsung_disable_runtime_pm(void *data)
 {
@@ -314,7 +321,6 @@ static void samsung_disable_runtime_pm(void *data)
 static int samsung_keypad_probe(struct platform_device *pdev)
 {
 	const struct samsung_keypad_platdata *pdata;
-	const struct matrix_keymap_data *keymap_data;
 	const struct platform_device_id *id;
 	struct samsung_keypad *keypad;
 	struct resource *res;
@@ -323,18 +329,17 @@ static int samsung_keypad_probe(struct platform_device *pdev)
 	int error;
 
 	pdata = dev_get_platdata(&pdev->dev);
-	if (!pdata) {
-		pdata = samsung_keypad_parse_dt(&pdev->dev);
+	if (pdata) {
+		if (!pdata->keymap_data) {
+			dev_err(&pdev->dev, "no keymap data defined\n");
+			return -EINVAL;
+		}
+	} else {
+		pdata = samsung_keypad_parse_properties(&pdev->dev);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}
 
-	keymap_data = pdata->keymap_data;
-	if (!keymap_data) {
-		dev_err(&pdev->dev, "no keymap data defined\n");
-		return -EINVAL;
-	}
-
 	if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
 		return -EINVAL;
 
@@ -398,7 +403,7 @@ static int samsung_keypad_probe(struct platform_device *pdev)
 	input_dev->open = samsung_keypad_open;
 	input_dev->close = samsung_keypad_close;
 
-	error = matrix_keypad_build_keymap(keymap_data, NULL,
+	error = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
 					   pdata->rows, pdata->cols,
 					   keypad->keycodes, input_dev);
 	if (error) {
@@ -439,11 +444,12 @@ static int samsung_keypad_probe(struct platform_device *pdev)
 	if (error)
 		return error;
 
-	if (pdev->dev.of_node) {
+	if (!dev_get_platdata(&pdev->dev)) {
 		devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
 		devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
 		devm_kfree(&pdev->dev, (void *)pdata);
 	}
+
 	return 0;
 }
 
-- 
2.46.0.184.g6999bdac58-goog