Input: mcs5000_ts - switch to using managed resources

Let's switch the driver to use managed resources, this will simplify
error handling and driver unbinding logic.
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/mcs5000_ts.c

@@ -161,10 +161,9 @@ static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
+static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data,
+				 const struct mcs_platform_data *platform_data)
 {
-	const struct mcs_platform_data *platform_data =
-		data->platform_data;
 	struct i2c_client *client = data->client;
 
 	/* Touch reset & sleep mode */
@@ -187,26 +186,30 @@ static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
 }
 
 static int mcs5000_ts_probe(struct i2c_client *client,
-		const struct i2c_device_id *id)
+			    const struct i2c_device_id *id)
 {
+	const struct mcs_platform_data *pdata;
 	struct mcs5000_ts_data *data;
 	struct input_dev *input_dev;
-	int ret;
+	int error;
 
-	if (!dev_get_platdata(&client->dev))
+	pdata = dev_get_platdata(&client->dev);
+	if (!pdata)
 		return -EINVAL;
 
-	data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);
-	input_dev = input_allocate_device();
-	if (!data || !input_dev) {
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
 		dev_err(&client->dev, "Failed to allocate memory\n");
-		ret = -ENOMEM;
-		goto err_free_mem;
+		return -ENOMEM;
 	}
 
 	data->client = client;
-	data->input_dev = input_dev;
-	data->platform_data = dev_get_platdata(&client->dev);
+
+	input_dev = devm_input_allocate_device(&client->dev);
+	if (!input_dev) {
+		dev_err(&client->dev, "Failed to allocate input device\n");
+		return -ENOMEM;
+	}
 
 	input_dev->name = "MELFAS MCS-5000 Touchscreen";
 	input_dev->id.bustype = BUS_I2C;
@@ -219,43 +222,29 @@ static int mcs5000_ts_probe(struct i2c_client *client,
 	input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);
 
 	input_set_drvdata(input_dev, data);
+	data->input_dev = input_dev;
 
-	if (data->platform_data->cfg_pin)
-		data->platform_data->cfg_pin();
-
-	ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
-			IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
+	if (pdata->cfg_pin)
+		pdata->cfg_pin();
 
-	if (ret < 0) {
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, mcs5000_ts_interrupt,
+					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+					  "mcs5000_ts", data);
+	if (error) {
 		dev_err(&client->dev, "Failed to register interrupt\n");
-		goto err_free_mem;
+		return error;
 	}
 
-	ret = input_register_device(data->input_dev);
-	if (ret < 0)
-		goto err_free_irq;
+	error = input_register_device(data->input_dev);
+	if (error) {
+		dev_err(&client->dev, "Failed to register input device\n");
+		return error;
+	}
 
-	mcs5000_ts_phys_init(data);
+	mcs5000_ts_phys_init(data, pdata);
 	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 ret;
-}
-
-static int mcs5000_ts_remove(struct i2c_client *client)
-{
-	struct mcs5000_ts_data *data = i2c_get_clientdata(client);
-
-	free_irq(client->irq, data);
-	input_unregister_device(data->input_dev);
-	kfree(data);
-
 	return 0;
 }
 
@@ -274,14 +263,15 @@ static int mcs5000_ts_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct mcs5000_ts_data *data = i2c_get_clientdata(client);
+	const struct mcs_platform_data *pdata = dev_get_platdata(dev);
 
-	mcs5000_ts_phys_init(data);
+	mcs5000_ts_phys_init(data, pdata);
 
 	return 0;
 }
+#endif
 
 static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume);
-#endif
 
 static const struct i2c_device_id mcs5000_ts_id[] = {
 	{ "mcs5000_ts", 0 },
@@ -291,12 +281,9 @@ MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
 
 static struct i2c_driver mcs5000_ts_driver = {
 	.probe		= mcs5000_ts_probe,
-	.remove		= mcs5000_ts_remove,
 	.driver = {
 		.name = "mcs5000_ts",
-#ifdef CONFIG_PM
 		.pm   = &mcs5000_ts_pm,
-#endif
 	},
 	.id_table	= mcs5000_ts_id,
 };