Input: tsc2004/5 - fix handling of VIO power supply

The chip needs to be powered up before calling tsc200x_stop_scan() which
communicates with it; move the call to enable the regulator earlier in
tsc200x_probe().

At the same time switch to using devm_regulator_get_enable() to simplify
error handling. This also makes sure that regulator is not shut off too
early when unbinding the driver.

Link: https://lore.kernel.org/r/20240711172719.1248373-1-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/tsc2004.c

@@ -42,11 +42,6 @@ static int tsc2004_probe(struct i2c_client *i2c)
 			     tsc2004_cmd);
 }
 
-static void tsc2004_remove(struct i2c_client *i2c)
-{
-	tsc200x_remove(&i2c->dev);
-}
-
 static const struct i2c_device_id tsc2004_idtable[] = {
 	{ "tsc2004" },
 	{ }
@@ -70,7 +65,6 @@ static struct i2c_driver tsc2004_driver = {
 	},
 	.id_table       = tsc2004_idtable,
 	.probe          = tsc2004_probe,
-	.remove         = tsc2004_remove,
 };
 module_i2c_driver(tsc2004_driver);
 

drivers/input/touchscreen/tsc2005.c

@@ -64,11 +64,6 @@ static int tsc2005_probe(struct spi_device *spi)
 			     tsc2005_cmd);
 }
 
-static void tsc2005_remove(struct spi_device *spi)
-{
-	tsc200x_remove(&spi->dev);
-}
-
 #ifdef CONFIG_OF
 static const struct of_device_id tsc2005_of_match[] = {
 	{ .compatible = "ti,tsc2005" },
@@ -85,7 +80,6 @@ static struct spi_driver tsc2005_driver = {
 		.pm		= pm_sleep_ptr(&tsc200x_pm_ops),
 	},
 	.probe	= tsc2005_probe,
-	.remove	= tsc2005_remove,
 };
 module_spi_driver(tsc2005_driver);
 

drivers/input/touchscreen/tsc200x-core.c

@@ -104,8 +104,6 @@ struct tsc200x {
 
 	bool			pen_down;
 
-	struct regulator	*vio;
-
 	struct gpio_desc	*reset_gpio;
 	int			(*tsc200x_cmd)(struct device *dev, u8 cmd);
 	int			irq;
@@ -495,10 +493,9 @@ int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id,
 		return error;
 	}
 
-	ts->vio = devm_regulator_get(dev, "vio");
-	if (IS_ERR(ts->vio)) {
-		error = PTR_ERR(ts->vio);
-		dev_err(dev, "error acquiring vio regulator: %d", error);
+	error = devm_regulator_get_enable(dev, "vio");
+	if (error) {
+		dev_err(dev, "error acquiring vio regulator: %d\n", error);
 		return error;
 	}
 
@@ -554,36 +551,20 @@ int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id,
 		return error;
 	}
 
-	error = regulator_enable(ts->vio);
-	if (error)
-		return error;
-
 	dev_set_drvdata(dev, ts);
 
 	error = input_register_device(ts->idev);
 	if (error) {
 		dev_err(dev,
 			"Failed to register input device, err: %d\n", error);
-		goto disable_regulator;
+		return error;
 	}
 
 	irq_set_irq_wake(irq, 1);
 	return 0;
-
-disable_regulator:
-	regulator_disable(ts->vio);
-	return error;
 }
 EXPORT_SYMBOL_GPL(tsc200x_probe);
 
-void tsc200x_remove(struct device *dev)
-{
-	struct tsc200x *ts = dev_get_drvdata(dev);
-
-	regulator_disable(ts->vio);
-}
-EXPORT_SYMBOL_GPL(tsc200x_remove);
-
 static int tsc200x_suspend(struct device *dev)
 {
 	struct tsc200x *ts = dev_get_drvdata(dev);

drivers/input/touchscreen/tsc200x-core.h

@@ -75,6 +75,5 @@ extern const struct attribute_group *tsc200x_groups[];
 int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id,
 		  struct regmap *regmap,
 		  int (*tsc200x_cmd)(struct device *dev, u8 cmd));
-void tsc200x_remove(struct device *dev);
 
 #endif