diff options
Diffstat (limited to 'drivers/iio/inkern.c')
| -rw-r--r-- | drivers/iio/inkern.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index f0846108d006..866fe904cba2 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -100,6 +100,28 @@ static int iio_dev_node_match(struct device *dev, void *data) return dev->of_node == data && dev->type == &iio_device_type; } +/** + * __of_iio_simple_xlate - translate iiospec to the IIO channel index + * @indio_dev: pointer to the iio_dev structure + * @iiospec: IIO specifier as found in the device tree + * + * This is simple translation function, suitable for the most 1:1 mapped + * channels in IIO chips. This function performs only one sanity check: + * whether IIO index is less than num_channels (that is specified in the + * iio_dev). + */ +static int __of_iio_simple_xlate(struct iio_dev *indio_dev, + const struct of_phandle_args *iiospec) +{ + if (!iiospec->args_count) + return 0; + + if (iiospec->args[0] >= indio_dev->num_channels) + return -EINVAL; + + return iiospec->args[0]; +} + static int __of_iio_channel_get(struct iio_channel *channel, struct device_node *np, int index) { @@ -122,18 +144,19 @@ static int __of_iio_channel_get(struct iio_channel *channel, indio_dev = dev_to_iio_dev(idev); channel->indio_dev = indio_dev; - index = iiospec.args_count ? iiospec.args[0] : 0; - if (index >= indio_dev->num_channels) { - err = -EINVAL; + if (indio_dev->info->of_xlate) + index = indio_dev->info->of_xlate(indio_dev, &iiospec); + else + index = __of_iio_simple_xlate(indio_dev, &iiospec); + if (index < 0) goto err_put; - } channel->channel = &indio_dev->channels[index]; return 0; err_put: iio_device_put(indio_dev); - return err; + return index; } static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) |