linux-kernel - [PATCH v3] Input: mpr121: Use devm_regulator_get_enable_read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20241119-input-mpr121-regulator-get-enable-read-voltage-v3-1-1d8ee5c22f6c@baylibre.com>
Date: Tue, 19 Nov 2024 16:27:40 -0600
From: David Lechner <dlechner@...libre.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH v3] Input: mpr121: Use
 devm_regulator_get_enable_read_voltage()

We can reduce boilerplate code by using
devm_regulator_get_enable_read_voltage().

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: David Lechner <dlechner@...libre.com>
---
This is left over from [1] and never got picked up, so resubmitting.

v3: changes picked up Dmitry's Ack and rebased on linux-next.

[1]: https://lore.kernel.org/all/20240429-regulator-get-enable-get-votlage-v2-7-b1f11ab766c1@baylibre.com/
---
 drivers/input/keyboard/mpr121_touchkey.c | 45 +++-----------------------------
 1 file changed, 3 insertions(+), 42 deletions(-)

diff --git a/drivers/input/keyboard/mpr121_touchkey.c b/drivers/input/keyboard/mpr121_touchkey.c
index 21827d2497fa..bd1a944ded46 100644
--- a/drivers/input/keyboard/mpr121_touchkey.c
+++ b/drivers/input/keyboard/mpr121_touchkey.c
@@ -82,42 +82,6 @@ static const struct mpr121_init_register init_reg_table[] = {
 	{ AUTO_CONFIG_CTRL_ADDR, 0x0b },
 };
 
-static void mpr121_vdd_supply_disable(void *data)
-{
-	struct regulator *vdd_supply = data;
-
-	regulator_disable(vdd_supply);
-}
-
-static struct regulator *mpr121_vdd_supply_init(struct device *dev)
-{
-	struct regulator *vdd_supply;
-	int err;
-
-	vdd_supply = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(vdd_supply)) {
-		dev_err(dev, "failed to get vdd regulator: %ld\n",
-			PTR_ERR(vdd_supply));
-		return vdd_supply;
-	}
-
-	err = regulator_enable(vdd_supply);
-	if (err) {
-		dev_err(dev, "failed to enable vdd regulator: %d\n", err);
-		return ERR_PTR(err);
-	}
-
-	err = devm_add_action_or_reset(dev, mpr121_vdd_supply_disable,
-				       vdd_supply);
-	if (err) {
-		dev_err(dev, "failed to add disable regulator action: %d\n",
-			err);
-		return ERR_PTR(err);
-	}
-
-	return vdd_supply;
-}
-
 static void mpr_touchkey_report(struct input_dev *dev)
 {
 	struct mpr121_touchkey *mpr121 = input_get_drvdata(dev);
@@ -233,7 +197,6 @@ static int mpr121_phys_init(struct mpr121_touchkey *mpr121,
 static int mpr_touchkey_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
-	struct regulator *vdd_supply;
 	int vdd_uv;
 	struct mpr121_touchkey *mpr121;
 	struct input_dev *input_dev;
@@ -241,11 +204,9 @@ static int mpr_touchkey_probe(struct i2c_client *client)
 	int error;
 	int i;
 
-	vdd_supply = mpr121_vdd_supply_init(dev);
-	if (IS_ERR(vdd_supply))
-		return PTR_ERR(vdd_supply);
-
-	vdd_uv = regulator_get_voltage(vdd_supply);
+	vdd_uv = devm_regulator_get_enable_read_voltage(dev, "vdd");
+	if (vdd_uv < 0)
+		return dev_err_probe(dev, vdd_uv, "failed to get vdd voltage\n");
 
 	mpr121 = devm_kzalloc(dev, sizeof(*mpr121), GFP_KERNEL);
 	if (!mpr121)

---
base-commit: 414c97c966b69e4a6ea7b32970fa166b2f9b9ef0
change-id: 20241119-input-mpr121-regulator-get-enable-read-voltage-4342a6afb4f2

Best regards,
-- 
David Lechner <dlechner@...libre.com>