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From:   Astrid Rost <astrid.rost@axis.com>
To:     Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>
CC:     <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <kernel@axis.com>, Astrid Rost <astrid.rost@axis.com>
Subject: [PATCH v2 3/7] iio: light: vcnl4000: Add als_it for vcnl4040/4200
Date:   Tue, 9 May 2023 16:01:49 +0200
Message-ID: <20230509140153.3279288-4-astrid.rost@axis.com>
In-Reply-To: <20230509140153.3279288-1-astrid.rost@axis.com>
References: <20230509140153.3279288-1-astrid.rost@axis.com>
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Add illumination integration time for vcnl4040 and vcnl4200.
Add read/write attribute for illumination integration time and read
attribute for available integration times.

Signed-off-by: Astrid Rost <astrid.rost@axis.com>
---
 drivers/iio/light/vcnl4000.c | 147 ++++++++++++++++++++++++++++++++---
 1 file changed, 135 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index e14475070ac3..d7445b6755fa 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 {
@@ -334,7 +349,7 @@ static int vcnl4200_init(struct vcnl4000_data *data)
 		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;
+		data->al_scale = 100000;
 		break;
 	}
 	mutex_init(&data->vcnl4200_al.lock);
@@ -506,6 +521,85 @@ 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;
+	const int(*als_it_times)[][2];
+	int size;
+
+	if (data->id == VCNL4200) {
+		als_it_times = &vcnl4200_als_it_times;
+		size = ARRAY_SIZE(vcnl4200_als_it_times);
+	} else {
+		als_it_times = &vcnl4040_als_it_times;
+		size = ARRAY_SIZE(vcnl4040_als_it_times);
+	}
+
+	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 >= size)
+		return -EINVAL;
+
+	*val = (*als_it_times)[ret][0];
+	*val2 = (*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, index = -1;
+	u16 regval;
+	const int(*als_it_times)[][2];
+	int size;
+
+	if (data->id == VCNL4200) {
+		als_it_times = &vcnl4200_als_it_times;
+		size = ARRAY_SIZE(vcnl4200_als_it_times);
+	} else {
+		als_it_times = &vcnl4040_als_it_times;
+		size = ARRAY_SIZE(vcnl4040_als_it_times);
+	}
+
+	for (i = 0; i < size; i++) {
+		if (val == (*als_it_times)[i][1]) {
+			index = i;
+			break;
+		}
+	}
+
+	if (index < 0)
+		return -EINVAL;
+
+	data->vcnl4200_al.sampling_rate = ktime_set(0, val * 1200000);
+	if (data->id == VCNL4200)
+		/* 24000 µlux/step * 50000 µs / val  */
+		data->al_scale = div_u64(1200000000, val);
+	else
+		/* 100000 µlux/step * 80000 µs / val */
+		data->al_scale = div_u64(8000000000, val);
+
+	mutex_lock(&data->vcnl4000_lock);
+
+	ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+	if (ret < 0)
+		goto out;
+
+	regval = (ret & ~VCNL4040_ALS_CONF_IT) |
+	    FIELD_PREP(VCNL4040_ALS_CONF_IT, index);
+	ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF,
+					regval);
+
+out:
+	mutex_unlock(&data->vcnl4000_lock);
+	return ret;
+}
+
 static int vcnl4040_read_ps_it(struct vcnl4000_data *data, int *val, int *val2)
 {
 	int ret;
@@ -616,9 +710,16 @@ 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;
@@ -637,9 +738,14 @@ 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;
 	}
@@ -654,12 +760,27 @@ static int vcnl4040_read_avail(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_INT_TIME:
-		if (data->id == VCNL4200) {
-			*vals = (int *)vcnl4200_ps_it_times;
-			*length = 2 * ARRAY_SIZE(vcnl4200_ps_it_times);
-		} else {
-			*vals = (int *)vcnl4040_ps_it_times;
-			*length = 2 * ARRAY_SIZE(vcnl4040_ps_it_times);
+		switch (chan->type) {
+		case IIO_LIGHT:
+			if (data->id == VCNL4200) {
+				*vals = (int *)vcnl4200_als_it_times;
+				*length = 2 * ARRAY_SIZE(vcnl4200_als_it_times);
+			} else {
+				*vals = (int *)vcnl4040_als_it_times;
+				*length = 2 * ARRAY_SIZE(vcnl4040_als_it_times);
+			}
+			break;
+		case IIO_PROXIMITY:
+			if (data->id == VCNL4200) {
+				*vals = (int *)vcnl4200_ps_it_times;
+				*length = 2 * ARRAY_SIZE(vcnl4200_ps_it_times);
+			} else {
+				*vals = (int *)vcnl4040_ps_it_times;
+				*length = 2 * ARRAY_SIZE(vcnl4040_ps_it_times);
+			}
+			break;
+		default:
+			return -EINVAL;
 		}
 		*type = IIO_VAL_INT_PLUS_MICRO;
 		return IIO_AVAIL_LIST;
@@ -1289,7 +1410,9 @@ 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) |
-- 
2.30.2