linux-kernel - [PATCH v2 2/2] NFC: nxp-nci: Add pad supply voltage pvdd-supply

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

Message-ID: <20230609154200.3620-1-raymondhackley@protonmail.com>
Date:   Fri, 09 Jun 2023 15:42:23 +0000
From:   Raymond Hackley <raymondhackley@...tonmail.com>
To:     linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Jeremy Kerr <jk@...econstruct.com.au>,
        Raymond Hackley <raymondhackley@...tonmail.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH v2 2/2] NFC: nxp-nci: Add pad supply voltage pvdd-supply

PN547/553, QN310/330 chips on some devices require a pad supply voltage
(PVDD). Otherwise, the NFC won't power up.

Implement support for pad supply voltage pvdd-supply that is enabled by
the nxp-nci driver so that the regulator gets enabled when needed.

Signed-off-by: Raymond Hackley <raymondhackley@...tonmail.com>
---
 drivers/nfc/nxp-nci/i2c.c | 42 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c
index d4c299be7949..1b8877757cee 100644
--- a/drivers/nfc/nxp-nci/i2c.c
+++ b/drivers/nfc/nxp-nci/i2c.c
@@ -35,6 +35,7 @@ struct nxp_nci_i2c_phy {
 
 	struct gpio_desc *gpiod_en;
 	struct gpio_desc *gpiod_fw;
+	struct regulator *pvdd;
 
 	int hard_fault; /*
 			 * < 0 if hardware error occurred (e.g. i2c err)
@@ -263,6 +264,22 @@ static const struct acpi_gpio_mapping acpi_nxp_nci_gpios[] = {
 	{ }
 };
 
+static void nxp_nci_i2c_poweroff(void *data)
+{
+	struct nxp_nci_i2c_phy *phy = data;
+	struct device *dev = &phy->i2c_dev->dev;
+	struct regulator *pvdd = phy->pvdd;
+	int r;
+
+	if (!IS_ERR(pvdd) && regulator_is_enabled(pvdd)) {
+		r = regulator_disable(pvdd);
+		if (r < 0)
+			dev_warn(dev,
+				 "Failed to disable regulator pvdd: %d\n",
+				 r);
+	}
+}
+
 static int nxp_nci_i2c_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -298,6 +315,29 @@ static int nxp_nci_i2c_probe(struct i2c_client *client)
 		return PTR_ERR(phy->gpiod_fw);
 	}
 
+	phy->pvdd = devm_regulator_get_optional(dev, "pvdd");
+	if (IS_ERR(phy->pvdd)) {
+		r = PTR_ERR(phy->pvdd);
+		if (r != -ENODEV)
+			return dev_err_probe(dev, r,
+					     "Failed to get regulator pvdd\n");
+	} else {
+		r = regulator_enable(phy->pvdd);
+		if (r < 0) {
+			nfc_err(dev,
+				"Failed to enable regulator pvdd: %d\n",
+				r);
+			return r;
+		}
+	}
+
+	r = devm_add_action_or_reset(dev, nxp_nci_i2c_poweroff, phy);
+	if (r < 0) {
+		nfc_err(dev, "Failed to install poweroff handler: %d\n",
+			r);
+		return r;
+	}
+
 	r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
 			  NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
 	if (r < 0)
@@ -319,6 +359,8 @@ static void nxp_nci_i2c_remove(struct i2c_client *client)
 
 	nxp_nci_remove(phy->ndev);
 	free_irq(client->irq, phy);
+
+	nxp_nci_i2c_poweroff(phy);
 }
 
 static const struct i2c_device_id nxp_nci_i2c_id_table[] = {
-- 
2.30.2