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Date: Mon, 20 Apr 2020 10:42:09 +0200
From: Mathieu Othacehe <m.othacehe@...il.com>
To: jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
pmeerw@...erw.net
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Mathieu Othacehe <m.othacehe@...il.com>
Subject: [PATCH v3 3/4] iio: vcnl4000: Add sampling frequency support for VCNL4010/20.
Add sampling frequency support for ambient light and proximity data on
VCNL4010 and VCNL4020 chips.
Signed-off-by: Mathieu Othacehe <m.othacehe@...il.com>
---
drivers/iio/light/vcnl4000.c | 191 ++++++++++++++++++++++++++++++++++-
1 file changed, 190 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index 73a3627d12b8..3f9d63858b51 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -88,6 +88,24 @@
#define VCNL4010_INT_DRDY \
(BIT(VCNL4010_INT_PROXIMITY) | BIT(VCNL4010_INT_ALS))
+#define VCNL4010_ALS_SAMPLING_FREQUENCY_AVAILABLE \
+ "1 2 3 4 5 6 8 10"
+#define VCNL4010_PROXIMITY_SAMPLING_FREQUENCY_AVAILABLE \
+ "1.95 3.90 7.81 16.62 31.25 62.5 125 250"
+
+static const int vcnl4010_als_sampling_frequency[] = {
+ 1, 2, 3, 4, 5, 6, 8, 10};
+
+static const int vcnl4010_prox_sampling_frequency[][2] = {
+ {1, 950000},
+ {3, 906250},
+ {7, 812500},
+ {16, 625000},
+ {31, 250000},
+ {62, 500000},
+ {125, 0},
+ {250, 0}
+};
#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */
@@ -393,6 +411,50 @@ static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val)
return vcnl4200_measure(data, &data->vcnl4200_ps, val);
}
+static int vcnl4010_read_proxy_samp_freq(struct vcnl4000_data *data, int *val,
+ int *val2)
+{
+ int ret;
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_byte_data(data->client, VCNL4010_PROX_RATE);
+ if (ret < 0)
+ goto end;
+
+ if (ret >= ARRAY_SIZE(vcnl4010_prox_sampling_frequency))
+ return -EINVAL;
+
+ *val = vcnl4010_prox_sampling_frequency[ret][0];
+ *val2 = vcnl4010_prox_sampling_frequency[ret][1];
+end:
+ mutex_unlock(&data->vcnl4000_lock);
+
+ return ret;
+}
+
+static int vcnl4010_read_als_samp_freq(struct vcnl4000_data *data, int *val)
+{
+ int ret;
+ int index, mask = 0x70;
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ALS_PARAM);
+ if (ret < 0)
+ goto end;
+
+ index = (ret & mask) >> 4;
+ if (index < 0 || index >= ARRAY_SIZE(vcnl4010_als_sampling_frequency))
+ return -EINVAL;
+
+ *val = vcnl4010_als_sampling_frequency[index];
+end:
+ mutex_unlock(&data->vcnl4000_lock);
+
+ return ret;
+}
+
static int vcnl4010_in_periodic_mode(struct vcnl4000_data *data)
{
int ret;
@@ -493,11 +555,119 @@ static int vcnl4010_read_raw(struct iio_dev *indio_dev,
iio_device_release_direct_mode(indio_dev);
return ret;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = vcnl4010_read_proxy_samp_freq(data, val, val2);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_LIGHT:
+ ret = vcnl4010_read_als_samp_freq(data, val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
default:
return -EINVAL;
}
}
+static int vcnl4010_write_proxy_samp_freq(struct vcnl4000_data *data, int val,
+ int val2)
+{
+ int ret;
+ int i;
+ int len = ARRAY_SIZE(vcnl4010_prox_sampling_frequency);
+
+ for (i = 0; i < len; i++) {
+ if (val <= vcnl4010_prox_sampling_frequency[i][0])
+ break;
+ }
+
+ if (i == len)
+ return -EINVAL;
+
+ mutex_lock(&data->vcnl4000_lock);
+ ret = i2c_smbus_write_byte_data(data->client, VCNL4010_PROX_RATE, i);
+ mutex_unlock(&data->vcnl4000_lock);
+
+ return ret;
+}
+
+static int vcnl4010_write_als_samp_freq(struct vcnl4000_data *data, int val)
+{
+ int ret;
+ int i;
+ int param;
+ int mask = 0x70;
+ int len = ARRAY_SIZE(vcnl4010_als_sampling_frequency);
+
+ for (i = 0; i < len; i++) {
+ if (val <= vcnl4010_als_sampling_frequency[i])
+ break;
+ }
+
+ if (i == len)
+ return -EINVAL;
+
+ mutex_lock(&data->vcnl4000_lock);
+
+ ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ALS_PARAM);
+ if (ret < 0)
+ goto end;
+
+ param = (ret & ~mask) | (i << 4);
+ ret = i2c_smbus_write_byte_data(data->client, VCNL4010_ALS_PARAM,
+ param);
+end:
+ mutex_unlock(&data->vcnl4000_lock);
+
+ return ret;
+}
+
+static int vcnl4010_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ int ret;
+ struct vcnl4000_data *data = iio_priv(indio_dev);
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ /* Protect against event capture. */
+ if (vcnl4010_in_periodic_mode(data)) {
+ ret = -EBUSY;
+ goto end;
+ }
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = vcnl4010_write_proxy_samp_freq(data, val, val2);
+ goto end;
+ case IIO_LIGHT:
+ ret = vcnl4010_write_als_samp_freq(data, val);
+ goto end;
+ default:
+ ret = -EINVAL;
+ goto end;
+ }
+ default:
+ ret = -EINVAL;
+ goto end;
+ }
+
+end:
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
+}
+
static int vcnl4010_read_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
@@ -710,27 +880,46 @@ static const struct iio_chan_spec vcnl4010_channels[] = {
.type = IIO_LIGHT,
.scan_index = -1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_SCALE),
}, {
.type = IIO_PROXIMITY,
.scan_index = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ),
.event_spec = vcnl4000_event_spec,
.num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
.ext_info = vcnl4000_ext_info,
},
};
+static IIO_CONST_ATTR(in_illuminance_sampling_frequency_available,
+ VCNL4010_ALS_SAMPLING_FREQUENCY_AVAILABLE);
+static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
+ VCNL4010_PROXIMITY_SAMPLING_FREQUENCY_AVAILABLE);
+
+static struct attribute *vcnl4010_attributes[] = {
+ &iio_const_attr_in_illuminance_sampling_frequency_available.dev_attr.attr,
+ &iio_const_attr_in_proximity_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group vcnl4010_attribute_group = {
+ .attrs = vcnl4010_attributes
+};
+
static const struct iio_info vcnl4000_info = {
.read_raw = vcnl4000_read_raw,
};
static const struct iio_info vcnl4010_info = {
.read_raw = vcnl4010_read_raw,
+ .write_raw = vcnl4010_write_raw,
.read_event_value = vcnl4010_read_event,
.write_event_value = vcnl4010_write_event,
.read_event_config = vcnl4010_read_event_config,
.write_event_config = vcnl4010_write_event_config,
+ .attrs = &vcnl4010_attribute_group,
};
static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
--
2.26.0
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