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iio: Introduce iio_validate_scan_mask_onehot
Add a helper function for validating a scan mask for devices where exactly one channel must be selected during sampling. This is a common case among devices which have scan mask restrictions so it makes sense to provide this function in the core. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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2 changed files with 19 additions and 0 deletions
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@ -570,6 +570,22 @@ int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
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}
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}
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EXPORT_SYMBOL(iio_sw_buffer_preenable);
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EXPORT_SYMBOL(iio_sw_buffer_preenable);
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/**
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* iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected
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* @indio_dev: the iio device
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* @mask: scan mask to be checked
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*
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* Return true if exactly one bit is set in the scan mask, false otherwise. It
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* can be used for devices where only one channel can be active for sampling at
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* a time.
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*/
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bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
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const unsigned long *mask)
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{
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return bitmap_weight(mask, indio_dev->masklength) == 1;
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}
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EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot);
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static bool iio_validate_scan_mask(struct iio_dev *indio_dev,
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static bool iio_validate_scan_mask(struct iio_dev *indio_dev,
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const unsigned long *mask)
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const unsigned long *mask)
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{
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{
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@ -177,6 +177,9 @@ ssize_t iio_buffer_show_enable(struct device *dev,
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int iio_sw_buffer_preenable(struct iio_dev *indio_dev);
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int iio_sw_buffer_preenable(struct iio_dev *indio_dev);
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bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
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const unsigned long *mask);
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#else /* CONFIG_IIO_BUFFER */
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#else /* CONFIG_IIO_BUFFER */
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static inline int iio_buffer_register(struct iio_dev *indio_dev,
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static inline int iio_buffer_register(struct iio_dev *indio_dev,
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