[PATCH v5 7/9] Input: wacom_i2c - Add support for vdd regulator

From: Alistair Francis
Date: Mon Apr 19 2021 - 04:39:46 EST


Add support for a VDD regulator. This allows the kernel to prove the
Wacom-I2C device on the rM2.

Signed-off-by: Alistair Francis <alistair@xxxxxxxxxxxxx>
---
drivers/input/touchscreen/wacom_i2c.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index 26881149d509..a5963d9e1194 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c
@@ -13,6 +13,7 @@
#include <linux/irq.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
+#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/of.h>
#include <asm/unaligned.h>
@@ -58,6 +59,7 @@ struct wacom_i2c {
struct i2c_client *client;
struct input_dev *input;
struct touchscreen_properties props;
+ struct regulator *vdd;
u8 data[WACOM_QUERY_SIZE];
bool prox;
int tool;
@@ -221,6 +223,20 @@ static int wacom_i2c_probe(struct i2c_client *client,
goto err_free_mem;
}

+ wac_i2c->vdd = regulator_get(&client->dev, "vdd");
+ if (IS_ERR(wac_i2c->vdd)) {
+ error = PTR_ERR(wac_i2c->vdd);
+ kfree(wac_i2c);
+ return error;
+ }
+
+ error = regulator_enable(wac_i2c->vdd);
+ if (error) {
+ regulator_put(wac_i2c->vdd);
+ kfree(wac_i2c);
+ return error;
+ }
+
wac_i2c->client = client;
wac_i2c->input = input;

@@ -277,6 +293,8 @@ static int wacom_i2c_probe(struct i2c_client *client,
err_free_irq:
free_irq(client->irq, wac_i2c);
err_free_mem:
+ regulator_disable(wac_i2c->vdd);
+ regulator_put(wac_i2c->vdd);
input_free_device(input);
kfree(wac_i2c);

--
2.31.1