From fd91a5f01373ebf672a6691f4dcd487af48be945 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Tue, 19 Nov 2013 12:52:29 -0800
Subject: [PATCH] Input: tsc2007 - convert to use devres-managed resources

This simplifies error handling path and allows us get rid of
tsc2007_remove().

Tested-by: Denis Carikli <denis@eukrea.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/touchscreen/tsc2007.c | 79 +++++++++++++++--------------
 1 file changed, 40 insertions(+), 39 deletions(-)

diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 03fbdf1e8613..1bf9906b5a3f 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -365,6 +365,14 @@ static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts,
 	return 0;
 }
 
+static void tsc2007_call_exit_platform_hw(void *data)
+{
+	struct device *dev = data;
+	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
+
+	pdata->exit_platform_hw();
+}
+
 static int tsc2007_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
@@ -388,11 +396,9 @@ static int tsc2007_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
-	input_dev = input_allocate_device();
-	if (!input_dev) {
-		err = -ENOMEM;
-		goto err_free_input;
-	};
+	input_dev = devm_input_allocate_device(&client->dev);
+	if (!input_dev)
+		return -ENOMEM;
 
 	i2c_set_clientdata(client, ts);
 
@@ -421,45 +427,41 @@ static int tsc2007_probe(struct i2c_client *client,
 	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
 			     ts->fuzzz, 0);
 
-	if (pdata && pdata->init_platform_hw)
-		pdata->init_platform_hw();
+	if (pdata) {
+		if (pdata->exit_platform_hw) {
+			err = devm_add_action(&client->dev,
+					      tsc2007_call_exit_platform_hw,
+					      &client->dev);
+			if (err) {
+				dev_err(&client->dev,
+					"Failed to register exit_platform_hw action, %d\n",
+					err);
+				return err;
+			}
+		}
 
-	err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq,
-				   IRQF_ONESHOT, client->dev.driver->name, ts);
-	if (err < 0) {
-		dev_err(&client->dev, "irq %d busy?\n", ts->irq);
-		goto err_free_input;
+		if (pdata->init_platform_hw)
+			pdata->init_platform_hw();
+	}
+
+	err = devm_request_threaded_irq(&client->dev, ts->irq,
+					tsc2007_hard_irq, tsc2007_soft_irq,
+					IRQF_ONESHOT,
+					client->dev.driver->name, ts);
+	if (err) {
+		dev_err(&client->dev, "Failed to request irq %d: %d\n",
+			ts->irq, err);
+		return err;
 	}
 
 	tsc2007_stop(ts);
 
 	err = input_register_device(input_dev);
-	if (err)
-		goto err_free_irq;
-
-	return 0;
-
- err_free_irq:
-	free_irq(ts->irq, ts);
-	if (pdata && pdata->exit_platform_hw)
-		pdata->exit_platform_hw();
- err_free_input:
-	input_free_device(input_dev);
-	return err;
-}
-
-static int tsc2007_remove(struct i2c_client *client)
-{
-	const struct tsc2007_platform_data *pdata = dev_get_platdata(&client->dev);
-	struct tsc2007 *ts = i2c_get_clientdata(client);
-
-	free_irq(ts->irq, ts);
-
-	if (pdata && pdata->exit_platform_hw)
-		pdata->exit_platform_hw();
-
-	input_unregister_device(ts->input);
-	kfree(ts);
+	if (err) {
+		dev_err(&client->dev,
+			"Failed to register input device: %d\n", err);
+		return err;
+	}
 
 	return 0;
 }
@@ -487,7 +489,6 @@ static struct i2c_driver tsc2007_driver = {
 	},
 	.id_table	= tsc2007_idtable,
 	.probe		= tsc2007_probe,
-	.remove		= tsc2007_remove,
 };
 
 module_i2c_driver(tsc2007_driver);