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Subject[PATCH v5 3/7] iio: light: vcnl4000: Add als_it for vcnl4040/4200
Date
Add illuminance integration time for vcnl4040 and vcnl4200.
Add read/write attribute for illuminance integration time and read
attribute for available integration times.
Set scale and sampling rate according to the integration time.

Signed-off-by: Astrid Rost <astrid.rost@axis.com>
---
drivers/iio/light/vcnl4000.c | 122 ++++++++++++++++++++++++++++++++---
1 file changed, 113 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index 090e20229855..b53f75b71309 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -80,6 +80,7 @@
#define VCNL4000_SELF_TIMED_EN BIT(0) /* start self-timed measurement */

#define VCNL4040_ALS_CONF_ALS_SHUTDOWN BIT(0)
+#define VCNL4040_ALS_CONF_IT GENMASK(7, 6) /* Ambient integration time */
#define VCNL4040_PS_CONF1_PS_SHUTDOWN BIT(0)
#define VCNL4040_PS_CONF2_PS_IT GENMASK(3, 1) /* Proximity integration time */
#define VCNL4040_PS_CONF2_PS_INT GENMASK(9, 8) /* Proximity interrupt mode */
@@ -133,6 +134,20 @@ static const int vcnl4200_ps_it_times[][2] = {
{0, 864},
};

+static const int vcnl4040_als_it_times[][2] = {
+ {0, 80000},
+ {0, 160000},
+ {0, 320000},
+ {0, 640000},
+};
+
+static const int vcnl4200_als_it_times[][2] = {
+ {0, 50000},
+ {0, 100000},
+ {0, 200000},
+ {0, 400000},
+};
+
#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */

enum vcnl4000_device_ids {
@@ -177,6 +192,9 @@ struct vcnl4000_chip_spec {
u8 int_reg;
const int(*ps_it_times)[][2];
const int num_ps_it_times;
+ const int(*als_it_times)[][2];
+ const int num_als_it_times;
+ const unsigned int ulux_step;
};

static const struct i2c_device_id vcnl4000_id[] = {
@@ -330,16 +348,15 @@ static int vcnl4200_init(struct vcnl4000_data *data)
data->vcnl4200_al.sampling_rate = ktime_set(0, 60000 * 1000);
/* Default wait time is 4.8ms, add 20% tolerance. */
data->vcnl4200_ps.sampling_rate = ktime_set(0, 5760 * 1000);
- data->al_scale = 24000;
break;
case VCNL4040_PROD_ID:
/* Default wait time is 80ms, add 20% tolerance. */
data->vcnl4200_al.sampling_rate = ktime_set(0, 96000 * 1000);
/* Default wait time is 5ms, add 20% tolerance. */
data->vcnl4200_ps.sampling_rate = ktime_set(0, 6000 * 1000);
- data->al_scale = 120000;
break;
}
+ data->al_scale = data->chip_spec->ulux_step;
mutex_init(&data->vcnl4200_al.lock);
mutex_init(&data->vcnl4200_ps.lock);

@@ -509,6 +526,63 @@ static int vcnl4000_set_pm_runtime_state(struct vcnl4000_data *data, bool on)
return ret;
}

+static int vcnl4040_read_als_it(struct vcnl4000_data *data, int *val, int *val2)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+ if (ret < 0)
+ return ret;
+
+ ret = FIELD_GET(VCNL4040_ALS_CONF_IT, ret);
+
+ if (ret >= data->chip_spec->num_als_it_times)
+ return -EINVAL;
+
+ *val = (*data->chip_spec->als_it_times)[ret][0];
+ *val2 = (*data->chip_spec->als_it_times)[ret][1];
+
+ return 0;
+}
+
+static ssize_t vcnl4040_write_als_it(struct vcnl4000_data *data, int val)
+{
+ unsigned int i;
+ int ret, reg_val = -1;
+ u16 regval;
+
+ for (i = 0; i < data->chip_spec->num_als_it_times; i++) {
+ if (val == (*data->chip_spec->als_it_times)[i][1]) {
+ reg_val = i;
+ break;
+ }
+ }
+
+ if (reg_val < 0)
+ return -EINVAL;
+
+ data->vcnl4200_al.sampling_rate = ktime_set(0, val * 1200);
+ data->al_scale = div_u64(mul_u32_u32(data->chip_spec->ulux_step,
+ (*data->chip_spec->als_it_times)[0][1]),
+ val);
+
+ 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_IT) |
+ FIELD_PREP(VCNL4040_ALS_CONF_IT, reg_val);
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4200_AL_CONF,
+ regval);
+
+out_unlock:
+ mutex_unlock(&data->vcnl4000_lock);
+ return ret;
+}
+
static int vcnl4040_read_ps_it(struct vcnl4000_data *data, int *val, int *val2)
{
int ret;
@@ -599,9 +673,16 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
*val2 = data->al_scale;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_INT_TIME:
- if (chan->type != IIO_PROXIMITY)
+ switch (chan->type) {
+ case IIO_LIGHT:
+ ret = vcnl4040_read_als_it(data, val, val2);
+ break;
+ case IIO_PROXIMITY:
+ ret = vcnl4040_read_ps_it(data, val, val2);
+ break;
+ default:
return -EINVAL;
- ret = vcnl4040_read_ps_it(data, val, val2);
+ }
if (ret < 0)
return ret;
return IIO_VAL_INT_PLUS_MICRO;
@@ -620,9 +701,14 @@ static int vcnl4040_write_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_INT_TIME:
if (val != 0)
return -EINVAL;
- if (chan->type != IIO_PROXIMITY)
+ switch (chan->type) {
+ case IIO_LIGHT:
+ return vcnl4040_write_als_it(data, val2);
+ case IIO_PROXIMITY:
+ return vcnl4040_write_ps_it(data, val2);
+ default:
return -EINVAL;
- return vcnl4040_write_ps_it(data, val2);
+ }
default:
return -EINVAL;
}
@@ -637,9 +723,19 @@ static int vcnl4040_read_avail(struct iio_dev *indio_dev,

switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
- *vals = (int *)(*data->chip_spec->ps_it_times);
+ switch (chan->type) {
+ case IIO_LIGHT:
+ *vals = (int *)(*data->chip_spec->als_it_times);
+ *length = 2 * data->chip_spec->num_als_it_times;
+ break;
+ case IIO_PROXIMITY:
+ *vals = (int *)(*data->chip_spec->ps_it_times);
+ *length = 2 * data->chip_spec->num_ps_it_times;
+ break;
+ default:
+ return -EINVAL;
+ }
*type = IIO_VAL_INT_PLUS_MICRO;
- *length = 2 * data->chip_spec->num_ps_it_times;
return IIO_AVAIL_LIST;
default:
return -EINVAL;
@@ -1261,7 +1357,9 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE),
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_INT_TIME),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME),
}, {
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
@@ -1334,6 +1432,9 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
.int_reg = VCNL4040_INT_FLAGS,
.ps_it_times = &vcnl4040_ps_it_times,
.num_ps_it_times = ARRAY_SIZE(vcnl4040_ps_it_times),
+ .als_it_times = &vcnl4040_als_it_times,
+ .num_als_it_times = ARRAY_SIZE(vcnl4040_als_it_times),
+ .ulux_step = 100000,
},
[VCNL4200] = {
.prod = "VCNL4200",
@@ -1348,6 +1449,9 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
.int_reg = VCNL4200_INT_FLAGS,
.ps_it_times = &vcnl4200_ps_it_times,
.num_ps_it_times = ARRAY_SIZE(vcnl4200_ps_it_times),
+ .als_it_times = &vcnl4200_als_it_times,
+ .num_als_it_times = ARRAY_SIZE(vcnl4200_als_it_times),
+ .ulux_step = 24000,
},
};

--
2.30.2
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