[PATCH v2] iio: light: ltr501: claim direct mode during select raw reads

[PATCH v2] iio: light: ltr501: claim direct mode during select raw reads

[Alison Schofield]

Driver was checking for direct mode but not locking it.  Use
claim/release helper functions to guarantee the device stays
in direct mode during required raw read cases.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
---
Changes in v2:
 Reworked IIO_CHAN_INFO_RAW case so claim and release are
 executed at same level in the switch statements. (rather
 than claims on top level and releases nested in cases)

 drivers/iio/light/ltr501.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
index 3afc53a..d577477 100644
--- a/drivers/iio/light/ltr501.c
+++ b/drivers/iio/light/ltr501.c
@@ -631,14 +631,16 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_PROCESSED:
-		if (iio_buffer_enabled(indio_dev))
-			return -EBUSY;
-
 		switch (chan->type) {
 		case IIO_LIGHT:
+			ret = iio_device_claim_direct_mode(indio_dev);
+			if (ret)
+				return ret;
+
 			mutex_lock(&data->lock_als);
 			ret = ltr501_read_als(data, buf);
 			mutex_unlock(&data->lock_als);
+			iio_device_release_direct_mode(indio_dev);
 			if (ret < 0)
 				return ret;
 			*val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
@@ -648,8 +650,9 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
 			return -EINVAL;
 		}
 	case IIO_CHAN_INFO_RAW:
-		if (iio_buffer_enabled(indio_dev))
-			return -EBUSY;
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
 
 		switch (chan->type) {
 		case IIO_INTENSITY:
@@ -657,21 +660,28 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
 			ret = ltr501_read_als(data, buf);
 			mutex_unlock(&data->lock_als);
 			if (ret < 0)
-				return ret;
+				break;
 			*val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
 					   buf[0] : buf[1]);
-			return IIO_VAL_INT;
+			ret = IIO_VAL_INT;
+			break;
 		case IIO_PROXIMITY:
 			mutex_lock(&data->lock_ps);
 			ret = ltr501_read_ps(data);
 			mutex_unlock(&data->lock_ps);
 			if (ret < 0)
-				return ret;
+				break;
 			*val = ret & LTR501_PS_DATA_MASK;
-			return IIO_VAL_INT;
+			ret = IIO_VAL_INT;
+			break;
 		default:
-			return -EINVAL;
+			ret = -EINVAL;
+			break;
 		}
+
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
+
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->type) {
 		case IIO_INTENSITY:
-- 
2.1.4

Re: [PATCH v2] iio: light: ltr501: claim direct mode during select raw reads

[Jonathan Cameron]

On 16/10/16 06:00, Alison Schofield wrote:
> Driver was checking for direct mode but not locking it.  Use
> claim/release helper functions to guarantee the device stays
> in direct mode during required raw read cases.
> 
> Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Very nice.

Applied to the togreg branch fo iio.git and pushed out as testing.
Peter, if you have any comments on this, there is still plenty of
time as I won't send a pull request until at lest next weekend.

Jonathan
> ---
> Changes in v2:
>  Reworked IIO_CHAN_INFO_RAW case so claim and release are
>  executed at same level in the switch statements. (rather
>  than claims on top level and releases nested in cases)
> 
>  drivers/iio/light/ltr501.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
> index 3afc53a..d577477 100644
> --- a/drivers/iio/light/ltr501.c
> +++ b/drivers/iio/light/ltr501.c
> @@ -631,14 +631,16 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
>  
>  	switch (mask) {
>  	case IIO_CHAN_INFO_PROCESSED:
> -		if (iio_buffer_enabled(indio_dev))
> -			return -EBUSY;
> -
>  		switch (chan->type) {
>  		case IIO_LIGHT:
> +			ret = iio_device_claim_direct_mode(indio_dev);
> +			if (ret)
> +				return ret;
> +
>  			mutex_lock(&data->lock_als);
>  			ret = ltr501_read_als(data, buf);
>  			mutex_unlock(&data->lock_als);
> +			iio_device_release_direct_mode(indio_dev);
>  			if (ret < 0)
>  				return ret;
>  			*val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
> @@ -648,8 +650,9 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
>  			return -EINVAL;
>  		}
>  	case IIO_CHAN_INFO_RAW:
> -		if (iio_buffer_enabled(indio_dev))
> -			return -EBUSY;
> +		ret = iio_device_claim_direct_mode(indio_dev);
> +		if (ret)
> +			return ret;
>  
>  		switch (chan->type) {
>  		case IIO_INTENSITY:
> @@ -657,21 +660,28 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
>  			ret = ltr501_read_als(data, buf);
>  			mutex_unlock(&data->lock_als);
>  			if (ret < 0)
> -				return ret;
> +				break;
>  			*val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
>  					   buf[0] : buf[1]);
> -			return IIO_VAL_INT;
> +			ret = IIO_VAL_INT;
> +			break;
>  		case IIO_PROXIMITY:
>  			mutex_lock(&data->lock_ps);
>  			ret = ltr501_read_ps(data);
>  			mutex_unlock(&data->lock_ps);
>  			if (ret < 0)
> -				return ret;
> +				break;
>  			*val = ret & LTR501_PS_DATA_MASK;
> -			return IIO_VAL_INT;
> +			ret = IIO_VAL_INT;
> +			break;
>  		default:
> -			return -EINVAL;
> +			ret = -EINVAL;
> +			break;
>  		}
> +
> +		iio_device_release_direct_mode(indio_dev);
> +		return ret;
> +
>  	case IIO_CHAN_INFO_SCALE:
>  		switch (chan->type) {
>  		case IIO_INTENSITY:
>