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iio: light: ltr390: Add interrupt persistance support

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Added support to configure the threshold interrupt persistance value by
providing IIO_EV_INFO_PERIOD attribute. The value written to the
attribute should be in miliseconds and should be greater than the
sampling rate of the sensor.

Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
Link: https://patch.msgid.link/20240914181246.504450-5-abhashkumarjha123@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Abhash Jha
2024-09-14 23:42:46 +05:30
committed by Jonathan Cameron
parent 7ca4b89570
commit 498a640a2e
1 changed files with 61 additions and 4 deletions
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65
drivers/iio/light/ltr390.c
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@@ -41,6 +41,7 @@
#define LTR390_ALS_DATA 0x0D
#define LTR390_UVS_DATA 0x10
#define LTR390_INT_CFG 0x19
#define LTR390_INT_PST 0x1A
#define LTR390_THRESH_UP 0x21
#define LTR390_THRESH_LOW 0x24
@@ -49,6 +50,8 @@
#define LTR390_ALS_UVS_MEAS_RATE_MASK GENMASK(2, 0)
#define LTR390_ALS_UVS_INT_TIME_MASK 0x70
#define LTR390_ALS_UVS_INT_TIME(x) FIELD_PREP(LTR390_ALS_UVS_INT_TIME_MASK, (x))
#define LTR390_INT_PST_MASK GENMASK(7, 4)
#define LTR390_INT_PST_VAL(x) FIELD_PREP(LTR390_INT_PST_MASK, (x))
#define LTR390_SW_RESET BIT(4)
#define LTR390_UVS_MODE BIT(3)
@@ -80,6 +83,11 @@ enum ltr390_mode {
LTR390_SET_UVS_MODE,
};
enum ltr390_meas_rate {
LTR390_GET_FREQ,
LTR390_GET_PERIOD,
};
struct ltr390_data {
struct regmap *regmap;
struct i2c_client *client;
@@ -157,7 +165,8 @@ static int ltr390_counts_per_uvi(struct ltr390_data *data)
return DIV_ROUND_CLOSEST(23 * data->gain * data->int_time_us, 10 * orig_gain * orig_int_time);
}
static int ltr390_get_samp_freq(struct ltr390_data *data)
static int ltr390_get_samp_freq_or_period(struct ltr390_data *data,
enum ltr390_meas_rate option)
{
int ret, value;
@@ -166,7 +175,7 @@ static int ltr390_get_samp_freq(struct ltr390_data *data)
return ret;
value = FIELD_GET(LTR390_ALS_UVS_MEAS_RATE_MASK, value);
return ltr390_samp_freq_table[value][0];
return ltr390_samp_freq_table[value][option];
}
static int ltr390_read_raw(struct iio_dev *iio_device,
@@ -226,7 +235,7 @@ static int ltr390_read_raw(struct iio_dev *iio_device,
return IIO_VAL_INT;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = ltr390_get_samp_freq(data);
*val = ltr390_get_samp_freq_or_period(data, LTR390_GET_FREQ);
return IIO_VAL_INT;
default:
@@ -251,7 +260,8 @@ static const struct iio_event_spec ltr390_event_spec[] = {
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_PERIOD),
}
};
@@ -397,6 +407,44 @@ static int ltr390_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec cons
}
}
static int ltr390_read_intr_prst(struct ltr390_data *data, int *val)
{
int ret, prst, samp_period;
samp_period = ltr390_get_samp_freq_or_period(data, LTR390_GET_PERIOD);
ret = regmap_read(data->regmap, LTR390_INT_PST, &prst);
if (ret < 0)
return ret;
*val = prst * samp_period;
return IIO_VAL_INT;
}
static int ltr390_write_intr_prst(struct ltr390_data *data, int val)
{
int ret, samp_period, new_val;
samp_period = ltr390_get_samp_freq_or_period(data, LTR390_GET_PERIOD);
/* persist period should be greater than or equal to samp period */
if (val < samp_period)
return -EINVAL;
new_val = DIV_ROUND_UP(val, samp_period);
if (new_val < 0 || new_val > 0x0f)
return -EINVAL;
guard(mutex)(&data->lock);
ret = regmap_update_bits(data->regmap,
LTR390_INT_PST,
LTR390_INT_PST_MASK,
LTR390_INT_PST_VAL(new_val));
if (ret)
return ret;
return 0;
}
static int ltr390_read_threshold(struct iio_dev *indio_dev,
enum iio_event_direction dir,
int *val, int *val2)
@@ -453,6 +501,9 @@ static int ltr390_read_event_value(struct iio_dev *indio_dev,
case IIO_EV_INFO_VALUE:
return ltr390_read_threshold(indio_dev, dir, val, val2);
case IIO_EV_INFO_PERIOD:
return ltr390_read_intr_prst(iio_priv(indio_dev), val);
default:
return -EINVAL;
}
@@ -472,6 +523,12 @@ static int ltr390_write_event_value(struct iio_dev *indio_dev,
return ltr390_write_threshold(indio_dev, dir, val, val2);
case IIO_EV_INFO_PERIOD:
if (val2 != 0)
return -EINVAL;
return ltr390_write_intr_prst(iio_priv(indio_dev), val);
default:
return -EINVAL;
}