[PATCH v1 39/63] Input: touchscreen: Atmel: Add device tree support for T15 key array objects

[Jiada Wang]

From: Daniel Gong <Zhanli.Gong@xxxxxxxxxxxx>

Signed-off-by: Daniel Gong <Zhanli.Gong@xxxxxxxxxxxx>
Signed-off-by: George G. Davis <george_davis@xxxxxxxxxx>
Signed-off-by: Jiada Wang <jiada_wang@xxxxxxxxxx>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 29 ++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index be63002c2b31..3b9544c0a209 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -4143,10 +4143,12 @@ static int mxt_parse_device_properties(struct mxt_data *data)
 {
 	static const char keymap_property[] = "linux,gpio-keymap";
 	static const char gpios_property[] = "atmel,gpios";
+	static const char buttons_property[] = "atmel,key-buttons";
 	struct device *dev = &data->client->dev;
 	struct device_node *np = dev ? dev->of_node : NULL;
 	struct device_node *np_gpio;
 	u32 *keymap;
+	u32 *buttonmap;
 	int n_keys;
 	int error;
 
@@ -4181,6 +4183,33 @@ static int mxt_parse_device_properties(struct mxt_data *data)
 		data->t19_num_keys = n_keys;
 	}
 
+	if (device_property_present(dev, buttons_property)) {
+		n_keys = device_property_read_u32_array(dev, buttons_property,
+							NULL, 0);
+		if (n_keys <= 0) {
+			error = n_keys < 0 ? n_keys : -EINVAL;
+			dev_err(dev, "invalid/malformed '%s' property: %d\n",
+				buttons_property, error);
+			return error;
+		}
+
+		buttonmap = devm_kmalloc_array(dev, n_keys, sizeof(*buttonmap),
+					       GFP_KERNEL);
+		if (!buttonmap)
+			return -ENOMEM;
+
+		error = device_property_read_u32_array(dev, buttons_property,
+						       buttonmap, n_keys);
+		if (error) {
+			dev_err(dev, "failed to parse '%s' property: %d\n",
+				buttons_property, error);
+			return error;
+		}
+
+		data->t15_keymap = buttonmap;
+		data->t15_num_keys = n_keys;
+	}
+
 	device_property_read_u32(dev, "atmel,suspend-mode", &data->suspend_mode);
 
 	np_gpio = of_get_child_by_name(np, gpios_property);
-- 
2.19.2