Input: exc3000 - support power supply regulators

Add power supply regulator support to the exc3000 devices.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Link: https://lore.kernel.org/r/20230707131042.10795-2-mike.looijmans@topic.nl
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
index 4af4c1e5d0da25458f98439d09306b32bf114abe..e3f6d21b3c1b3d5510682d883279c40e47db37ce 100644 (file)
--- a/drivers/input/touchscreen/exc3000.c
+++ b/drivers/input/touchscreen/exc3000.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/regulator/consumer.h>
 #include <linux/sizes.h>
 #include <linux/timer.h>
 #include <asm/unaligned.h>
@@ -360,6 +361,12 @@ static int exc3000_probe(struct i2c_client *client)
        if (IS_ERR(data->reset))
                return PTR_ERR(data->reset);
 
+       /* For proper reset sequence, enable power while reset asserted */
+       error = devm_regulator_get_enable(&client->dev, "vdd");
+       if (error && error != -ENODEV)
+               return dev_err_probe(&client->dev, error,
+                                    "failed to request vdd regulator\n");
+
        if (data->reset) {
                msleep(EXC3000_RESET_MS);
                gpiod_set_value_cansleep(data->reset, 0);