linux-kernel - [PATCH 4/5] proximity: vl53l0x: Handle the reset GPIO

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Date:   Mon, 23 May 2022 20:53:43 +0300
From:   Markuss Broks <markuss.broks@...il.com>
To:     linux-kernel@...r.kernel.org, jic23@...nel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Markuss Broks <markuss.broks@...il.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Song Qiang <songqiang1304521@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH 4/5] proximity: vl53l0x: Handle the reset GPIO

Handle the GPIO connected to the XSHUT/RST_N pin of VL53L0X.

Signed-off-by: Markuss Broks <markuss.broks@...il.com>
---
 drivers/iio/proximity/vl53l0x-i2c.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
index 8581a873919f..36c48a824725 100644
--- a/drivers/iio/proximity/vl53l0x-i2c.c
+++ b/drivers/iio/proximity/vl53l0x-i2c.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
@@ -44,6 +45,7 @@ struct vl53l0x_data {
 	struct i2c_client *client;
 	struct completion completion;
 	struct regulator *vdd_supply;
+	struct gpio_desc *reset_gpio;
 };
 
 static irqreturn_t vl53l0x_handle_irq(int irq, void *priv)
@@ -197,6 +199,8 @@ static void vl53l0x_power_off(void *_data)
 {
 	struct vl53l0x_data *data = _data;
 
+	gpiod_set_value_cansleep(data->reset_gpio, 1);
+
 	regulator_disable(data->vdd_supply);
 }
 
@@ -208,6 +212,8 @@ static int vl53l0x_power_on(struct vl53l0x_data *data)
 	if (ret)
 		return ret;
 
+	gpiod_set_value_cansleep(data->reset_gpio, 0);
+
 	usleep_range(3200, 5000);
 
 	return 0;
@@ -237,6 +243,11 @@ static int vl53l0x_probe(struct i2c_client *client)
 		return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply),
 				     "Unable to get VDD regulator\n");
 
+	data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(data->reset_gpio))
+		return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio),
+				     "Cannot get reset GPIO\n");
+
 	error = vl53l0x_power_on(data);
 	if (error)
 		return dev_err_probe(&client->dev, error,
-- 
2.36.1