[PATCH 2/2] Input: edt-ft5x06 - add support for iovcc-supply

[Stephan Gerhold <stephan@gerhold.net>]

At the moment, the edt-ft5x06 driver can control a single regulator
("vcc"). However, some FocalTech touch controllers have an additional
IOVCC pin that should be supplied with the digital I/O voltage.

The I/O voltage might be provided by another regulator that should also
be kept on. Otherwise, the touchscreen can randomly stop functioning if
the regulator is turned off because no other components still require it.

Implement (optional) support for also enabling an "iovcc-supply".
IOVCC is needed whenever VCC is needed, so switch to the regulator bulk
APIs to request/enable/disable both when appropriate.

Cc: Ondrej Jirman <megous@megous.com>
Cc: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
 drivers/input/touchscreen/edt-ft5x06.c | 35 ++++++++++++++------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 2eefbc2485bc..bf2e208112fe 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -103,7 +103,7 @@ struct edt_ft5x06_ts_data {
 	struct touchscreen_properties prop;
 	u16 num_x;
 	u16 num_y;
-	struct regulator *vcc;
+	struct regulator_bulk_data regulators[2];
 
 	struct gpio_desc *reset_gpio;
 	struct gpio_desc *wake_gpio;
@@ -1066,7 +1066,7 @@ static void edt_ft5x06_disable_regulator(void *arg)
 {
 	struct edt_ft5x06_ts_data *data = arg;
 
-	regulator_disable(data->vcc);
+	regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
 }
 
 static int edt_ft5x06_ts_probe(struct i2c_client *client,
@@ -1098,18 +1098,19 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
 
 	tsdata->max_support_points = chip_data->max_support_points;
 
-	tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
-	if (IS_ERR(tsdata->vcc)) {
-		error = PTR_ERR(tsdata->vcc);
-		if (error != -EPROBE_DEFER)
-			dev_err(&client->dev,
-				"failed to request regulator: %d\n", error);
-		return error;
-	}
+	tsdata->regulators[0].supply = "vcc";
+	tsdata->regulators[1].supply = "iovcc";
+	error = devm_regulator_bulk_get(&client->dev,
+					ARRAY_SIZE(tsdata->regulators),
+					tsdata->regulators);
+	if (error)
+		return dev_err_probe(&client->dev, error,
+				     "failed to request regulators\n");
 
-	error = regulator_enable(tsdata->vcc);
+	error = regulator_bulk_enable(ARRAY_SIZE(tsdata->regulators),
+				      tsdata->regulators);
 	if (error < 0) {
-		dev_err(&client->dev, "failed to enable vcc: %d\n", error);
+		dev_err(&client->dev, "failed to enable regulators: %d\n", error);
 		return error;
 	}
 
@@ -1286,9 +1287,10 @@ static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
 	gpiod_set_value_cansleep(reset_gpio, 1);
 	usleep_range(1000, 2000);
 
-	ret = regulator_disable(tsdata->vcc);
+	ret = regulator_bulk_disable(ARRAY_SIZE(tsdata->regulators),
+				     tsdata->regulators);
 	if (ret)
-		dev_warn(dev, "Failed to disable vcc\n");
+		dev_warn(dev, "Failed to disable regulators\n");
 
 	return 0;
 }
@@ -1319,9 +1321,10 @@ static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
 		gpiod_set_value_cansleep(reset_gpio, 1);
 		usleep_range(5000, 6000);
 
-		ret = regulator_enable(tsdata->vcc);
+		ret = regulator_bulk_enable(ARRAY_SIZE(tsdata->regulators),
+					    tsdata->regulators);
 		if (ret) {
-			dev_err(dev, "Failed to enable vcc\n");
+			dev_err(dev, "Failed to enable regulators\n");
 			return ret;
 		}
 
-- 
2.30.0