linux-kernel - [PATCH] iio: light: vcnl4000: Set ps high definition for 4040/4200

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Date: Thu, 21 Dec 2023 17:33:09 +0100
From: Mårten Lindahl <marten.lindahl@...s.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel@...s.com>, Mårten Lindahl <marten.lindahl@...s.com>
Subject: [PATCH] iio: light: vcnl4000: Set ps high definition for 4040/4200

The vcnl4040/vcnl4200 proximity sensor defaults to 12 bit data
resolution, but the chip also supports 16 bit data resolution, which is
called proximity high definition (PS_HD).

Make the vcnl4040/vcnl4200 proximity sensor use the high definition for
all data readings.

Signed-off-by: Mårten Lindahl <marten.lindahl@...s.com>
---
 drivers/iio/light/vcnl4000.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index fdf763a04b0b..4846f3b698b5 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -90,6 +90,7 @@
 #define VCNL4040_PS_CONF1_PS_SHUTDOWN	BIT(0)
 #define VCNL4040_PS_CONF2_PS_IT	GENMASK(3, 1) /* Proximity integration time */
 #define VCNL4040_CONF1_PS_PERS	GENMASK(5, 4) /* Proximity interrupt persistence setting */
+#define VCNL4040_PS_CONF2_PS_HD		BIT(11)	/* Proximity high definition */
 #define VCNL4040_PS_CONF2_PS_INT	GENMASK(9, 8) /* Proximity interrupt mode */
 #define VCNL4040_PS_CONF3_MPS		GENMASK(6, 5) /* Proximity multi pulse number */
 #define VCNL4040_PS_MS_LED_I		GENMASK(10, 8) /* Proximity current */
@@ -345,6 +346,7 @@ static int vcnl4200_set_power_state(struct vcnl4000_data *data, bool on)
 static int vcnl4200_init(struct vcnl4000_data *data)
 {
 	int ret, id;
+	u16 regval;
 
 	ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID);
 	if (ret < 0)
@@ -389,6 +391,17 @@ static int vcnl4200_init(struct vcnl4000_data *data)
 	mutex_init(&data->vcnl4200_al.lock);
 	mutex_init(&data->vcnl4200_ps.lock);
 
+	/* Use 16 bits proximity sensor readings */
+	ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
+	if (ret >= 0) {
+		regval = (ret | VCNL4040_PS_CONF2_PS_HD);
+		ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1,
+						regval);
+	}
+
+	if (ret < 0)
+		dev_info(&data->client->dev, "Default to 12 bits sensor data");
+
 	ret = data->chip_spec->set_power_state(data, true);
 	if (ret < 0)
 		return ret;

---
base-commit: a39b6ac3781d46ba18193c9dbb2110f31e9bffe9
change-id: 20231221-vcnl4000-ps-hd-863f4f8fcea7

Best regards,
-- 
Mårten Lindahl <marten.lindahl@...s.com>