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iio: light: vcnl4000: Set ps high definition for 4040/4200

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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. Please note that in order to preserve the 12 bit
integer part of the in_proximity_raw output, the format is changed from
integer to fixed point.

Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20231221-vcnl4000-ps-hd-v3-1-6dcc889372be@axis.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mårten Lindahl 2024-01-15 12:44:36 +01:00 committed by Jonathan Cameron
parent 1ca53b5df1
commit 44b9038345
1 changed files with 35 additions and 1 deletions
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36
drivers/iio/light/vcnl4000.c
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@ -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 */
@ -114,6 +115,13 @@
#define VCNL4010_INT_DRDY \
(BIT(VCNL4010_INT_PROXIMITY) | BIT(VCNL4010_INT_ALS))
#define VCNL4040_CONF3_PS_MPS_16BITS 3 /* 8 multi pulses */
#define VCNL4040_CONF3_PS_LED_I_16BITS 3 /* 120 mA */
#define VCNL4040_CONF3_PS_SAMPLE_16BITS \
(FIELD_PREP(VCNL4040_PS_CONF3_MPS, VCNL4040_CONF3_PS_MPS_16BITS) | \
FIELD_PREP(VCNL4040_PS_MS_LED_I, VCNL4040_CONF3_PS_LED_I_16BITS))
static const int vcnl4010_prox_sampling_frequency[][2] = {
{1, 950000},
{3, 906250},
@ -195,6 +203,7 @@ struct vcnl4000_data {
enum vcnl4000_device_ids id;
int rev;
int al_scale;
int ps_scale;
u8 ps_int; /* proximity interrupt mode */
u8 als_int; /* ambient light interrupt mode*/
const struct vcnl4000_chip_spec *chip_spec;
@ -345,6 +354,7 @@ 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)
@ -386,9 +396,32 @@ static int vcnl4200_init(struct vcnl4000_data *data)
break;
}
data->al_scale = data->chip_spec->ulux_step;
data->ps_scale = 16;
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)
return ret;
regval = ret | VCNL4040_PS_CONF2_PS_HD;
ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1,
regval);
if (ret < 0)
return ret;
/* Align proximity sensor sample rate to 16 bits data width */
ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF3);
if (ret < 0)
return ret;
regval = ret | VCNL4040_CONF3_PS_SAMPLE_16BITS;
ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF3,
regval);
if (ret < 0)
return ret;
ret = data->chip_spec->set_power_state(data, true);
if (ret < 0)
return ret;
@ -901,8 +934,9 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
break;
case IIO_PROXIMITY:
ret = data->chip_spec->measure_proximity(data, val);
*val2 = data->ps_scale;
if (!ret)
ret = IIO_VAL_INT;
ret = IIO_VAL_FRACTIONAL;
break;
default:
ret = -EINVAL;