[PATCH v5 5/7] iio: light: vcnl4000: Add period for vcnl4040/4200

From: Astrid Rost
Date: Tue May 30 2023 - 10:27:04 EST

Add read/write attribute for proximity and illuminance period. The
period is set in the interrupt persistence flags(PS_PERS and ALS_PERS).
An interrupt will not be asserted if the raw value is not over (or lower)
than the threshold for the set continued amount of measurements.
The time in seconds is calculated by the number of continued refreshes
multiplied with the integration time.
It will always pick the next lower possible value. The period changes,
if the integration time is changed.

Signed-off-by: Astrid Rost <astrid.rost@xxxxxxxx>
---
drivers/iio/light/vcnl4000.c | 258 ++++++++++++++++++++++++++++++-----
1 file changed, 224 insertions(+), 34 deletions(-)

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index 8022805a6af4..3ae137bcd51a 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -24,6 +24,7 @@
#include <linux/delay.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
+#include <linux/units.h>

#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
@@ -84,8 +85,10 @@
#define VCNL4040_ALS_CONF_ALS_SHUTDOWN BIT(0)
#define VCNL4040_ALS_CONF_IT GENMASK(7, 6) /* Ambient integration time */
#define VCNL4040_ALS_CONF_INT_EN BIT(1) /* Ambient light Interrupt enable */
+#define VCNL4040_ALS_CONF_PERS GENMASK(3, 2) /* Ambient interrupt persistence setting */
#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_INT GENMASK(9, 8) /* Proximity interrupt mode */
#define VCNL4040_PS_IF_AWAY BIT(8) /* Proximity event cross low threshold */
#define VCNL4040_PS_IF_CLOSE BIT(9) /* Proximity event cross high threshold */
@@ -153,6 +156,9 @@ static const int vcnl4200_als_it_times[][2] = {
{0, 400000},
};

+static const int vcnl4040_als_persistence[] = {1, 2, 4, 8};
+static const int vcnl4040_ps_persistence[] = {1, 2, 3, 4};
+
#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */

enum vcnl4000_device_ids {
@@ -643,6 +649,134 @@ static ssize_t vcnl4040_write_ps_it(struct vcnl4000_data *data, int val)
return ret;
}

+static ssize_t vcnl4040_read_als_period(struct vcnl4000_data *data, int *val, int *val2)
+{
+ int ret, ret_pers, ret_it;
+ int64_t val_c;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+ if (ret < 0)
+ return ret;
+
+ ret_pers = FIELD_GET(VCNL4040_ALS_CONF_PERS, ret);
+
+ if (ret_pers >= ARRAY_SIZE(vcnl4040_als_persistence))
+ return -EINVAL;
+
+ ret_it = FIELD_GET(VCNL4040_ALS_CONF_IT, ret);
+
+ if (ret_it >= data->chip_spec->num_als_it_times)
+ return -EINVAL;
+
+ val_c = mul_u32_u32((*data->chip_spec->als_it_times)[ret_it][1],
+ vcnl4040_als_persistence[ret_pers]);
+ *val = div_u64_rem(val_c, MICRO, val2);
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static ssize_t vcnl4040_write_als_period(struct vcnl4000_data *data, int val, int val2)
+{
+ unsigned int index;
+ int ret, ret_it;
+ u16 regval;
+ int64_t val_n = mul_u32_u32(val, MICRO) + val2;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+ if (ret < 0)
+ return ret;
+
+ ret_it = FIELD_GET(VCNL4040_ALS_CONF_IT, ret);
+
+ if (ret_it >= data->chip_spec->num_als_it_times)
+ return -EINVAL;
+
+ for (index = 0; index < ARRAY_SIZE(vcnl4040_als_persistence) - 1; index++)
+ if (val_n < mul_u32_u32(vcnl4040_als_persistence[index],
+ (*data->chip_spec->als_it_times)[ret_it][1]))
+ break;
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+ if (ret < 0)
+ goto out_unlock;
+
+ regval = (ret & ~VCNL4040_ALS_CONF_PERS) |
+ FIELD_PREP(VCNL4040_ALS_CONF_PERS, index);
+ ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF,
+ regval);
+
+out_unlock:
+ mutex_unlock(&data->vcnl4000_lock);
+ return ret;
+}
+
+static ssize_t vcnl4040_read_ps_period(struct vcnl4000_data *data, int *val, int *val2)
+{
+ int ret, ret_pers, ret_it;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
+ if (ret < 0)
+ return ret;
+
+ ret_pers = FIELD_GET(VCNL4040_CONF1_PS_PERS, ret);
+
+ if (ret_pers >= ARRAY_SIZE(vcnl4040_ps_persistence))
+ return -EINVAL;
+
+ ret_it = FIELD_GET(VCNL4040_PS_CONF2_PS_IT, ret);
+
+ if (ret_it >= data->chip_spec->num_ps_it_times)
+ return -EINVAL;
+
+ *val = (*data->chip_spec->ps_it_times)[ret_it][0];
+ *val2 = (*data->chip_spec->ps_it_times)[ret_it][1] *
+ vcnl4040_ps_persistence[ret_pers];
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static ssize_t vcnl4040_write_ps_period(struct vcnl4000_data *data, int val, int val2)
+{
+ int ret, ret_it, index;
+ u16 regval;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
+ if (ret < 0)
+ return ret;
+
+ ret_it = FIELD_GET(VCNL4040_PS_CONF2_PS_IT, ret);
+
+ if (ret_it >= data->chip_spec->num_ps_it_times)
+ return -EINVAL;
+
+ if (val > 0)
+ index = ARRAY_SIZE(vcnl4040_ps_persistence) - 1;
+ else {
+ for (index = 0; index < ARRAY_SIZE(vcnl4040_ps_persistence) - 1; index++) {
+ if (val2 <= vcnl4040_ps_persistence[index] *
+ (*data->chip_spec->ps_it_times)[ret_it][1])
+ break;
+ }
+ }
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
+ if (ret < 0)
+ goto out_unlock;
+
+ regval = (ret & ~VCNL4040_CONF1_PS_PERS) |
+ FIELD_PREP(VCNL4040_CONF1_PS_PERS, index);
+ ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1,
+ regval);
+
+out_unlock:
+ mutex_unlock(&data->vcnl4000_lock);
+ return ret;
+}
+
static int vcnl4000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@@ -940,28 +1074,44 @@ static int vcnl4040_read_event(struct iio_dev *indio_dev,

switch (chan->type) {
case IIO_LIGHT:
- switch (dir) {
- case IIO_EV_DIR_RISING:
- ret = i2c_smbus_read_word_data(data->client,
- VCNL4040_ALS_THDH_LM);
- break;
- case IIO_EV_DIR_FALLING:
- ret = i2c_smbus_read_word_data(data->client,
- VCNL4040_ALS_THDL_LM);
+ switch (info) {
+ case IIO_EV_INFO_PERIOD:
+ return vcnl4040_read_als_period(data, val, val2);
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = i2c_smbus_read_word_data(data->client,
+ VCNL4040_ALS_THDH_LM);
+ break;
+ case IIO_EV_DIR_FALLING:
+ ret = i2c_smbus_read_word_data(data->client,
+ VCNL4040_ALS_THDL_LM);
+ break;
+ default:
+ return -EINVAL;
+ }
break;
default:
return -EINVAL;
}
break;
case IIO_PROXIMITY:
- switch (dir) {
- case IIO_EV_DIR_RISING:
- ret = i2c_smbus_read_word_data(data->client,
- VCNL4040_PS_THDH_LM);
- break;
- case IIO_EV_DIR_FALLING:
- ret = i2c_smbus_read_word_data(data->client,
- VCNL4040_PS_THDL_LM);
+ switch (info) {
+ case IIO_EV_INFO_PERIOD:
+ return vcnl4040_read_ps_period(data, val, val2);
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = i2c_smbus_read_word_data(data->client,
+ VCNL4040_PS_THDH_LM);
+ break;
+ case IIO_EV_DIR_FALLING:
+ ret = i2c_smbus_read_word_data(data->client,
+ VCNL4040_PS_THDL_LM);
+ break;
+ default:
+ return -EINVAL;
+ }
break;
default:
return -EINVAL;
@@ -987,28 +1137,48 @@ static int vcnl4040_write_event(struct iio_dev *indio_dev,
struct vcnl4000_data *data = iio_priv(indio_dev);
switch (chan->type) {
case IIO_LIGHT:
- switch (dir) {
- case IIO_EV_DIR_RISING:
- ret = i2c_smbus_write_word_data(data->client,
- VCNL4040_ALS_THDH_LM, val);
- break;
- case IIO_EV_DIR_FALLING:
- ret = i2c_smbus_write_word_data(data->client,
- VCNL4040_ALS_THDL_LM, val);
+ switch (info) {
+ case IIO_EV_INFO_PERIOD:
+ return vcnl4040_write_als_period(data, val, val2);
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4040_ALS_THDH_LM,
+ val);
+ break;
+ case IIO_EV_DIR_FALLING:
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4040_ALS_THDL_LM,
+ val);
+ break;
+ default:
+ return -EINVAL;
+ }
break;
default:
return -EINVAL;
}
break;
case IIO_PROXIMITY:
- switch (dir) {
- case IIO_EV_DIR_RISING:
- ret = i2c_smbus_write_word_data(data->client,
- VCNL4040_PS_THDH_LM, val);
- break;
- case IIO_EV_DIR_FALLING:
- ret = i2c_smbus_write_word_data(data->client,
- VCNL4040_PS_THDL_LM, val);
+ switch (info) {
+ case IIO_EV_INFO_PERIOD:
+ return vcnl4040_write_ps_period(data, val, val2);
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4040_PS_THDH_LM,
+ val);
+ break;
+ case IIO_EV_DIR_FALLING:
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4040_PS_THDL_LM,
+ val);
+ break;
+ default:
+ return -EINVAL;
+ }
break;
default:
return -EINVAL;
@@ -1397,6 +1567,22 @@ static const struct iio_event_spec vcnl4000_event_spec[] = {
}
};

+static const struct iio_event_spec vcnl4040_als_event_spec[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_PERIOD),
+ },
+};
+
static const struct iio_event_spec vcnl4040_event_spec[] = {
{
.type = IIO_EV_TYPE_THRESH,
@@ -1406,6 +1592,10 @@ static const struct iio_event_spec vcnl4040_event_spec[] = {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_PERIOD),
},
};

@@ -1453,8 +1643,8 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME),
- .event_spec = vcnl4000_event_spec,
- .num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
+ .event_spec = vcnl4040_als_event_spec,
+ .num_event_specs = ARRAY_SIZE(vcnl4040_als_event_spec),
}, {
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
--
2.30.2