[PATCH V5 1/1] Input: mcs_touchkey: use devm_* functions

[Beomho Seo <beomho.seo@samsung.com>]

This patch use devm_* funtions in mcs_touchkey driver.
As a result, error path and remove() funtion is simplified.

Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
---
Changes in v5:
- Remove mcs_touchkey_remove function again.
- Add devm_add_action for use action touchkey power off.
Changes in v4:
- free_irq are back again for equivalent transformation.
Changes in v3:
- Some codes are back again. use fw_version, driver name and poweron.
Changes in v2:
- Additionally use devm_kzalloc for mcs_touchkey_data struct.

 drivers/input/keyboard/mcs_touchkey.c |   60 ++++++++++++++-------------------
 1 file changed, 26 insertions(+), 34 deletions(-)

diff --git a/drivers/input/keyboard/mcs_touchkey.c b/drivers/input/keyboard/mcs_touchkey.c
index 1da8e0b..be7fe3d 100644
--- a/drivers/input/keyboard/mcs_touchkey.c
+++ b/drivers/input/keyboard/mcs_touchkey.c
@@ -96,6 +96,13 @@ static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static void mcs_touchkey_power_off(void *mcs_data)
+{
+	struct mcs_touchkey_data *data = mcs_data;
+
+	data->poweron(false);
+}
+
 static int mcs_touchkey_probe(struct i2c_client *client,
 		const struct i2c_device_id *id)
 {
@@ -113,14 +120,11 @@ static int mcs_touchkey_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	data = kzalloc(sizeof(struct mcs_touchkey_data) +
-			sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
-			GFP_KERNEL);
-	input_dev = input_allocate_device();
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	input_dev = devm_input_allocate_device(&client->dev);
 	if (!data || !input_dev) {
 		dev_err(&client->dev, "Failed to allocate memory\n");
-		error = -ENOMEM;
-		goto err_free_mem;
+		return -ENOMEM;
 	}
 
 	data->client = client;
@@ -143,7 +147,7 @@ static int mcs_touchkey_probe(struct i2c_client *client,
 	if (fw_ver < 0) {
 		error = fw_ver;
 		dev_err(&client->dev, "i2c read error[%d]\n", error);
-		goto err_free_mem;
+		return error;
 	}
 	dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
 
@@ -173,43 +177,32 @@ static int mcs_touchkey_probe(struct i2c_client *client,
 
 	if (pdata->poweron) {
 		data->poweron = pdata->poweron;
+		error = devm_add_action(&client->dev,
+					mcs_touchkey_power_off, data);
+		if (error) {
+			dev_err(&client->dev,
+				"Failed to register  action, %d\n", error);
+			return error;
+		}
 		data->poweron(true);
 	}
 
-	error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
-				     IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
-				     client->dev.driver->name, data);
+	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+				mcs_touchkey_interrupt,	IRQF_TRIGGER_FALLING |
+				IRQF_ONESHOT, client->dev.driver->name, data);
 	if (error) {
 		dev_err(&client->dev, "Failed to register interrupt\n");
-		goto err_free_mem;
+		return error;
 	}
 
 	error = input_register_device(input_dev);
-	if (error)
-		goto err_free_irq;
+	if (error) {
+		dev_err(&client->dev, "Failed to register input device\n");
+		return error;
+	}
 
 	i2c_set_clientdata(client, data);
 	return 0;
-
-err_free_irq:
-	free_irq(client->irq, data);
-err_free_mem:
-	input_free_device(input_dev);
-	kfree(data);
-	return error;
-}
-
-static int mcs_touchkey_remove(struct i2c_client *client)
-{
-	struct mcs_touchkey_data *data = i2c_get_clientdata(client);
-
-	free_irq(client->irq, data);
-	if (data->poweron)
-		data->poweron(false);
-	input_unregister_device(data->input_dev);
-	kfree(data);
-
-	return 0;
 }
 
 static void mcs_touchkey_shutdown(struct i2c_client *client)
@@ -269,7 +262,6 @@ static struct i2c_driver mcs_touchkey_driver = {
 		.pm	= &mcs_touchkey_pm_ops,
 	},
 	.probe		= mcs_touchkey_probe,
-	.remove		= mcs_touchkey_remove,
 	.shutdown       = mcs_touchkey_shutdown,
 	.id_table	= mcs_touchkey_id,
 };
-- 
1.7.9.5