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From:   Markuss Broks <markuss.broks@gmail.com>
To:     linux-kernel@vger.kernel.org
Cc:     ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org,
        Markuss Broks <markuss.broks@gmail.com>,
        Song Qiang <songqiang1304521@gmail.com>,
        Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>, linux-iio@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org
Subject: [PATCH 3/5] proximity: vl53l0x: Handle the VDD regulator
Date:   Tue, 10 May 2022 23:42:54 +0300
Message-Id: <20220510204256.8874-4-markuss.broks@gmail.com>
In-Reply-To: <20220510204256.8874-1-markuss.broks@gmail.com>
References: <20220510204256.8874-1-markuss.broks@gmail.com>
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Handle the regulator supplying the VDD pin of VL53L0X.

Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
---
 drivers/iio/proximity/vl53l0x-i2c.c | 37 +++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
index 16f809c479cb..74aeb2548ef6 100644
--- a/drivers/iio/proximity/vl53l0x-i2c.c
+++ b/drivers/iio/proximity/vl53l0x-i2c.c
@@ -42,6 +42,7 @@
 struct vl53l0x_data {
 	struct i2c_client *client;
 	struct completion completion;
+	struct regulator *vdd_supply;
 };
 
 static irqreturn_t vl53l0x_handle_irq(int irq, void *priv)
@@ -187,10 +188,31 @@ static const struct iio_info vl53l0x_info = {
 	.read_raw = vl53l0x_read_raw,
 };
 
+static void vl53l0x_power_off(void *_data)
+{
+	struct vl53l0x_data *data = _data;
+
+	regulator_disable(data->vdd_supply);
+}
+
+static int vl53l0x_power_on(struct vl53l0x_data *data)
+{
+	int ret;
+
+	ret = regulator_enable(data->vdd_supply);
+	if (ret)
+		return ret;
+
+	usleep_range(3200, 5000);
+
+	return 0;
+}
+
 static int vl53l0x_probe(struct i2c_client *client)
 {
 	struct vl53l0x_data *data;
 	struct iio_dev *indio_dev;
+	int error;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
@@ -205,6 +227,21 @@ static int vl53l0x_probe(struct i2c_client *client)
 				     I2C_FUNC_SMBUS_BYTE_DATA))
 		return -EOPNOTSUPP;
 
+	data->vdd_supply = devm_regulator_get_optional(&client->dev, "vdd");
+	if (IS_ERR(data->vdd_supply))
+		return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply),
+				     "Unable to get VDD regulator\n");
+
+	error = devm_add_action_or_reset(&client->dev, vl53l0x_power_off, data);
+	if (error)
+		return dev_err_probe(&client->dev, error,
+				     "Failed to install poweroff action\n");
+
+	error = vl53l0x_power_on(data);
+	if (error)
+		return dev_err_probe(&client->dev, error,
+				     "Failed to power on the chip\n");
+
 	indio_dev->name = "vl53l0x";
 	indio_dev->info = &vl53l0x_info;
 	indio_dev->channels = vl53l0x_channels;
-- 
2.35.1