linux-kernel - [PATCH v4 2/4] Input: atmel_mxt_ts - move calls to register the input device to separate function

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Date: Wed, 17 Apr 2024 11:05:25 +0200
From: Stefan Eichenberger <eichest@...il.com>
To: nick@...anahar.org,
	dmitry.torokhov@...il.com,
	robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	nicolas.ferre@...rochip.com,
	alexandre.belloni@...tlin.com,
	claudiu.beznea@...on.dev,
	linus.walleij@...aro.org
Cc: linux-input@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Stefan Eichenberger <stefan.eichenberger@...adex.com>
Subject: [PATCH v4 2/4] Input: atmel_mxt_ts - move calls to register the input device to separate function

From: Stefan Eichenberger <stefan.eichenberger@...adex.com>

The calls to register the input device are moved to a separate function
so that we can call it without having to confiugre the device. This is
necessary if we want to power on the device only when it is opened.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@...adex.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 34 +++++++++++++++++-------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 52867ce3b9b6..7c807d1f1f9b 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -2277,6 +2277,28 @@ static void mxt_config_cb(const struct firmware *cfg, void *ctx)
 	release_firmware(cfg);
 }
 
+static void mxt_debug_init(struct mxt_data *data);
+
+static int mxt_device_register(struct mxt_data *data)
+{
+	int error;
+
+	/* If input device is not already registered */
+	if (!data->input_dev) {
+		if (data->multitouch) {
+			error = mxt_initialize_input_device(data);
+			if (error)
+				return error;
+		} else {
+			dev_warn(&data->client->dev, "No touch object detected\n");
+		}
+
+		mxt_debug_init(data);
+	}
+
+	return 0;
+}
+
 static int mxt_initialize(struct mxt_data *data)
 {
 	struct i2c_client *client = data->client;
@@ -2831,15 +2853,9 @@ static int mxt_configure_objects(struct mxt_data *data,
 			dev_warn(dev, "Error %d updating config\n", error);
 	}
 
-	if (data->multitouch) {
-		error = mxt_initialize_input_device(data);
-		if (error)
-			return error;
-	} else {
-		dev_warn(dev, "No touch object detected\n");
-	}
-
-	mxt_debug_init(data);
+	error = mxt_device_register(data);
+	if (error)
+		return error;
 
 	return 0;
 }
-- 
2.40.1