Input: ad7879 - use more devm interfaces

gpiochip_add now has a managed version, and we can remove sysfs attribute
group via devm_add_action_or_reset (at least until we have devm version of
sysfs_create_group). This allows us to get rid of ad7879_remove().
Reviewed-by: Michael Hennerich <michael.hennerich@analog.com>
Tested-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/ad7879-i2c.c

@@ -45,17 +45,6 @@ static int ad7879_i2c_probe(struct i2c_client *client,
 	if (IS_ERR(ts))
 		return PTR_ERR(ts);
 
-	i2c_set_clientdata(client, ts);
-
-	return 0;
-}
-
-static int ad7879_i2c_remove(struct i2c_client *client)
-{
-	struct ad7879 *ts = i2c_get_clientdata(client);
-
-	ad7879_remove(ts);
-
 	return 0;
 }
 
@@ -81,7 +70,6 @@ static struct i2c_driver ad7879_i2c_driver = {
 		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
 	},
 	.probe		= ad7879_i2c_probe,
-	.remove		= ad7879_i2c_remove,
 	.id_table	= ad7879_id,
 };
 

drivers/input/touchscreen/ad7879-spi.c

@@ -62,15 +62,6 @@ static int ad7879_spi_probe(struct spi_device *spi)
 	return 0;
 }
 
-static int ad7879_spi_remove(struct spi_device *spi)
-{
-	struct ad7879 *ts = spi_get_drvdata(spi);
-
-	ad7879_remove(ts);
-
-	return 0;
-}
-
 #ifdef CONFIG_OF
 static const struct of_device_id ad7879_spi_dt_ids[] = {
 	{ .compatible = "adi,ad7879", },
@@ -86,7 +77,6 @@ static struct spi_driver ad7879_spi_driver = {
 		.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
 	},
 	.probe		= ad7879_spi_probe,
-	.remove		= ad7879_spi_remove,
 };
 
 module_spi_driver(ad7879_spi_driver);

drivers/input/touchscreen/ad7879.c

@@ -458,7 +458,7 @@ static int ad7879_gpio_add(struct ad7879 *ts,
 
 	mutex_init(&ts->mutex);
 
-	if (pdata->gpio_export) {
+	if (pdata && pdata->gpio_export) {
 		ts->gc.direction_input = ad7879_gpio_direction_input;
 		ts->gc.direction_output = ad7879_gpio_direction_output;
 		ts->gc.get = ad7879_gpio_get_value;
@@ -470,7 +470,7 @@ static int ad7879_gpio_add(struct ad7879 *ts,
 		ts->gc.owner = THIS_MODULE;
 		ts->gc.parent = ts->dev;
 
-		ret = gpiochip_add_data(&ts->gc, ts);
+		ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
 		if (ret)
 			dev_err(ts->dev, "failed to register gpio %d\n",
 				ts->gc.base);
@@ -478,25 +478,12 @@ static int ad7879_gpio_add(struct ad7879 *ts,
 
 	return ret;
 }
-
-static void ad7879_gpio_remove(struct ad7879 *ts)
-{
-	const struct ad7879_platform_data *pdata = dev_get_platdata(ts->dev);
-
-	if (pdata && pdata->gpio_export)
-		gpiochip_remove(&ts->gc);
-
-}
 #else
-static inline int ad7879_gpio_add(struct ad7879 *ts,
+static int ad7879_gpio_add(struct ad7879 *ts,
 			   const struct ad7879_platform_data *pdata)
 {
 	return 0;
 }
-
-static inline void ad7879_gpio_remove(struct ad7879 *ts)
-{
-}
 #endif
 
 static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
@@ -525,6 +512,13 @@ static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
 	return 0;
 }
 
+static void ad7879_cleanup_sysfs(void *_ts)
+{
+	struct ad7879 *ts = _ts;
+
+	sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
+}
+
 struct ad7879 *ad7879_probe(struct device *dev, struct regmap *regmap,
 			    int irq, u16 bustype, u8 devid)
 {
@@ -660,35 +654,23 @@ struct ad7879 *ad7879_probe(struct device *dev, struct regmap *regmap,
 
 	err = sysfs_create_group(&dev->kobj, &ad7879_attr_group);
 	if (err)
-		goto err_out;
+		return ERR_PTR(err);
+
+	err = devm_add_action_or_reset(dev, ad7879_cleanup_sysfs, ts);
+	if (err)
+		return ERR_PTR(err);
 
-	if (pdata) {
 	err = ad7879_gpio_add(ts, pdata);
 	if (err)
-			goto err_remove_attr;
-	}
+		return ERR_PTR(err);
 
 	err = input_register_device(input_dev);
 	if (err)
-		goto err_remove_gpio;
-
-	return ts;
-
-err_remove_gpio:
-	ad7879_gpio_remove(ts);
-err_remove_attr:
-	sysfs_remove_group(&dev->kobj, &ad7879_attr_group);
-err_out:
 		return ERR_PTR(err);
-}
-EXPORT_SYMBOL(ad7879_probe);
 
-void ad7879_remove(struct ad7879 *ts)
-{
-	ad7879_gpio_remove(ts);
-	sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
+	return 0;
 }
-EXPORT_SYMBOL(ad7879_remove);
+EXPORT_SYMBOL(ad7879_probe);
 
 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");

drivers/input/touchscreen/ad7879.h

@@ -19,6 +19,5 @@ extern const struct dev_pm_ops ad7879_pm_ops;
 
 struct ad7879 *ad7879_probe(struct device *dev, struct regmap *regmap,
 			    int irq, u16 bustype, u8 devid);
-void ad7879_remove(struct ad7879 *);
 
 #endif