staging: iio: ad7606: oversampling_ratio clean-up

The oversampling ratio is controlled using the oversampling pins, OS [2:0] with OS2 being the MSB control bit, and OS0 the LSB control bit.

The gpio connected to the OS2 pin is not being set correctly, only OS0 and OS1 pins are being set. Fix the typo to allow proper control of the oversampling pins.

Signed-off-by Eva Rachel Retuya <[email protected]>

Fixes b9618c0 ("staging: IIO: ADC: New driver for AD7606/AD7606-6/AD7606-4")

Acked-by Lars-Peter Clausen <[email protected]>

---
 drivers/staging/iio/adc/ad7606_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

drivers/staging/iio/adc/ad7606_core.c +1 -1

index f79ee61..cbd6bc5 100644
@@ -189,7 +189,7 @@ static ssize_t ad7606_store_oversampling_ratio(struct device *dev,
 	mutex_lock(&indio_dev->mlock);
 	gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1);
 	gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1);
-	gpio_set_value(st->pdata->gpio_os1, (ret >> 2) & 1);
+	gpio_set_value(st->pdata->gpio_os2, (ret >> 2) & 1);
 	st->oversampling = lval;
 	mutex_unlock(&indio_dev->mlock);
 

This driver predates the availability of IIO_CHAN_INFO_OVERSAMPLING_RATIO attribute wherein usage has some advantages like it can be accessed by in-kernel consumers as well as reduces the code size.

Therefore, use IIO_CHAN_INFO_OVERSAMPLING_RATIO to implement the oversampling_ratio attribute instead of using IIO_DEVICE_ATTR() macro.

Move code from the functions associated with IIO_DEVICE_ATTR() into the read_raw hook as well as add the write_raw hook with both masks set to IIO_CHAN_INFO_OVERSAMPLING_RATIO.

Signed-off-by Eva Rachel Retuya <[email protected]>

Acked-by Lars-Peter Clausen <[email protected]>

---
 drivers/staging/iio/adc/ad7606_core.c | 67 ++++++++++++++++-------------------
 1 file changed, 31 insertions(+), 36 deletions(-)

drivers/staging/iio/adc/ad7606_core.c +31 -36

index cbd6bc5..2042225 100644
@@ -103,6 +103,9 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
 		*val = st->range * 2;
 		*val2 = st->chip_info->channels[0].scan_type.realbits;
 		return IIO_VAL_FRACTIONAL_LOG2;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		*val = st->oversampling;
+		return IIO_VAL_INT;
 	}
 	return -EINVAL;
 }

@@ -145,16 +148,6 @@ static IIO_DEVICE_ATTR(in_voltage_range, S_IRUGO | S_IWUSR,
 		       ad7606_show_range, ad7606_store_range, 0);
 static IIO_CONST_ATTR(in_voltage_range_available, "5000 10000");
 
-static ssize_t ad7606_show_oversampling_ratio(struct device *dev,
-					      struct device_attribute *attr,
-					      char *buf)
-{
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-	struct ad7606_state *st = iio_priv(indio_dev);
-
-	return sprintf(buf, "%u\n", st->oversampling);
-}
-
 static int ad7606_oversampling_get_index(unsigned int val)
 {
 	unsigned char supported[] = {0, 2, 4, 8, 16, 32, 64};

@@ -167,44 +160,43 @@ static int ad7606_oversampling_get_index(unsigned int val)
 	return -EINVAL;
 }
 
-static ssize_t ad7606_store_oversampling_ratio(struct device *dev,
-					       struct device_attribute *attr,
-					       const char *buf, size_t count)
+static int ad7606_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val,
+			    int val2,
+			    long mask)
 {
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7606_state *st = iio_priv(indio_dev);
-	unsigned long lval;
 	int ret;
 
-	ret = kstrtoul(buf, 10, &lval);
-	if (ret)
-		return ret;
+	switch (mask) {
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		if (val2)
+			return -EINVAL;
+		ret = ad7606_oversampling_get_index(val);
+		if (ret < 0) {
+			dev_err(st->dev, "oversampling %d is not supported\n",
+				val);
+			return ret;
+		}
 
-	ret = ad7606_oversampling_get_index(lval);
-	if (ret < 0) {
-		dev_err(dev, "oversampling %lu is not supported\n", lval);
-		return ret;
+		mutex_lock(&indio_dev->mlock);
+		gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1);
+		gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1);
+		gpio_set_value(st->pdata->gpio_os2, (ret >> 2) & 1);
+		st->oversampling = val;
+		mutex_unlock(&indio_dev->mlock);
+		return 0;
+	default:
+		return -EINVAL;
 	}
-
-	mutex_lock(&indio_dev->mlock);
-	gpio_set_value(st->pdata->gpio_os0, (ret >> 0) & 1);
-	gpio_set_value(st->pdata->gpio_os1, (ret >> 1) & 1);
-	gpio_set_value(st->pdata->gpio_os2, (ret >> 2) & 1);
-	st->oversampling = lval;
-	mutex_unlock(&indio_dev->mlock);
-
-	return count;
 }
 
-static IIO_DEVICE_ATTR(oversampling_ratio, S_IRUGO | S_IWUSR,
-		       ad7606_show_oversampling_ratio,
-		       ad7606_store_oversampling_ratio, 0);
 static IIO_CONST_ATTR(oversampling_ratio_available, "0 2 4 8 16 32 64");
 
 static struct attribute *ad7606_attributes_os_and_range[] = {
 	&iio_dev_attr_in_voltage_range.dev_attr.attr,
 	&iio_const_attr_in_voltage_range_available.dev_attr.attr,
-	&iio_dev_attr_oversampling_ratio.dev_attr.attr,
 	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
 	NULL,
 };

@@ -214,7 +206,6 @@ static const struct attribute_group ad7606_attribute_group_os_and_range = {
 };
 
 static struct attribute *ad7606_attributes_os[] = {
-	&iio_dev_attr_oversampling_ratio.dev_attr.attr,
 	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
 	NULL,
 };

@@ -241,6 +232,8 @@ static const struct attribute_group ad7606_attribute_group_range = {
 		.address = num,					\
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
+		.info_mask_shared_by_all =			\
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
 		.scan_index = num,				\
 		.scan_type = {					\
 			.sign = 's',				\

@@ -429,12 +422,14 @@ static const struct iio_info ad7606_info_no_os_or_range = {
 static const struct iio_info ad7606_info_os_and_range = {
 	.driver_module = THIS_MODULE,
 	.read_raw = &ad7606_read_raw,
+	.write_raw = &ad7606_write_raw,
 	.attrs = &ad7606_attribute_group_os_and_range,
 };
 
 static const struct iio_info ad7606_info_os = {
 	.driver_module = THIS_MODULE,
 	.read_raw = &ad7606_read_raw,
+	.write_raw = &ad7606_write_raw,
 	.attrs = &ad7606_attribute_group_os,
 };