diff options
| -rw-r--r-- | drivers/iio/industrialio-core.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index b7a397717..69feb91 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1134,6 +1134,29 @@ static const struct file_operations iio_buffer_fileops = { .compat_ioctl = iio_ioctl, }; +static int iio_check_unique_scan_index(struct iio_dev *indio_dev) +{ + int i, j; + const struct iio_chan_spec *channels = indio_dev->channels; + + if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) + return 0; + + for (i = 0; i < indio_dev->num_channels - 1; i++) { + if (channels[i].scan_index < 0) + continue; + for (j = i + 1; j < indio_dev->num_channels; j++) + if (channels[i].scan_index == channels[j].scan_index) { + dev_err(&indio_dev->dev, + "Duplicate scan index %d\n", + channels[i].scan_index); + return -EINVAL; + } + } + + return 0; +} + static const struct iio_buffer_setup_ops noop_ring_setup_ops; /** @@ -1148,6 +1171,10 @@ int iio_device_register(struct iio_dev *indio_dev) if (!indio_dev->dev.of_node && indio_dev->dev.parent) indio_dev->dev.of_node = indio_dev->dev.parent->of_node; + ret = iio_check_unique_scan_index(indio_dev); + if (ret < 0) + return ret; + /* configure elements for the chrdev */ indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |