[PATCH 3/8] Input: mcs-touchkey - convert to use devm_* api

[Yangtao Li]

Use devm_* api to simplify code, this makes it unnecessary to explicitly
release resources.

Signed-off-by: Yangtao Li <frank.li@xxxxxxxx>
---
 drivers/input/keyboard/mcs_touchkey.c | 51 +++++++++++----------------
 1 file changed, 21 insertions(+), 30 deletions(-)

diff --git a/drivers/input/keyboard/mcs_touchkey.c b/drivers/input/keyboard/mcs_touchkey.c
index de312d8eb974..a0d2e3b1bdc9 100644
--- a/drivers/input/keyboard/mcs_touchkey.c
+++ b/drivers/input/keyboard/mcs_touchkey.c
@@ -92,10 +92,18 @@ static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static void mcs_touchkey_poweroff(void *data)
+{
+	struct mcs_touchkey_data *touchkey = data;
+
+	touchkey->poweron(false);
+}
+
 static int mcs_touchkey_probe(struct i2c_client *client)
 {
 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
 	const struct mcs_platform_data *pdata;
+	struct device *dev = &client->dev;
 	struct mcs_touchkey_data *data;
 	struct input_dev *input_dev;
 	unsigned int fw_reg;
@@ -109,13 +117,12 @@ static int mcs_touchkey_probe(struct i2c_client *client)
 		return -EINVAL;
 	}
 
-	data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1),
+	data = devm_kzalloc(dev, struct_size(data, keycodes, pdata->key_maxval + 1),
 		       GFP_KERNEL);
-	input_dev = input_allocate_device();
+	input_dev = devm_input_allocate_device(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;
@@ -136,9 +143,8 @@ static int mcs_touchkey_probe(struct i2c_client *client)
 
 	fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
 	if (fw_ver < 0) {
-		error = fw_ver;
 		dev_err(&client->dev, "i2c read error[%d]\n", error);
-		goto err_free_mem;
+		return fw_ver;
 	}
 	dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
 
@@ -169,40 +175,26 @@ static int mcs_touchkey_probe(struct i2c_client *client)
 	if (pdata->poweron) {
 		data->poweron = pdata->poweron;
 		data->poweron(true);
+
+		error = devm_add_action_or_reset(dev, mcs_touchkey_poweroff, data);
+		if (error)
+			return error;
 	}
 
-	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(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;
+		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 void 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);
 }
 
 static void mcs_touchkey_shutdown(struct i2c_client *client)
@@ -259,7 +251,6 @@ static struct i2c_driver mcs_touchkey_driver = {
 		.pm	= pm_sleep_ptr(&mcs_touchkey_pm_ops),
 	},
 	.probe		= mcs_touchkey_probe,
-	.remove		= mcs_touchkey_remove,
 	.shutdown       = mcs_touchkey_shutdown,
 	.id_table	= mcs_touchkey_id,
 };
-- 
2.39.0