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This is useful for multi-channel devices that have multiple backends, where looking up by index is more straightforward than using named backends. Extract __devm_iio_backend_fwnode_get_by_index() from the existing __devm_iio_backend_fwnode_get(), taking the index directly as a parameter. The new public API devm_iio_backend_get_by_index() uses the index to find the backend reference in the io-backends property, avoiding the need for io-backend-names. Reviewed-by: David Lechner Reviewed-by: Nuno Sá Signed-off-by: Antoniu Miclaus --- Changes in v9: - No changes drivers/iio/industrialio-backend.c | 53 +++++++++++++++++++++--------- include/linux/iio/backend.h | 1 + 2 files changed, 39 insertions(+), 15 deletions(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index 10e689f49441..138ebebc9c0d 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -964,23 +964,13 @@ int iio_backend_data_transfer_addr(struct iio_backend *back, u32 address) } EXPORT_SYMBOL_NS_GPL(iio_backend_data_transfer_addr, "IIO_BACKEND"); -static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name, - struct fwnode_handle *fwnode) +static struct iio_backend *__devm_iio_backend_fwnode_get_by_index(struct device *dev, + struct fwnode_handle *fwnode, + unsigned int index) { struct iio_backend *back; - unsigned int index; int ret; - if (name) { - ret = device_property_match_string(dev, "io-backend-names", - name); - if (ret < 0) - return ERR_PTR(ret); - index = ret; - } else { - index = 0; - } - struct fwnode_handle *fwnode_back __free(fwnode_handle) = fwnode_find_reference(fwnode, "io-backends", index); if (IS_ERR(fwnode_back)) @@ -996,8 +986,7 @@ static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, con if (ret) return ERR_PTR(ret); - if (name) - back->idx = index; + back->idx = index; return back; } @@ -1005,6 +994,24 @@ static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, con return ERR_PTR(-EPROBE_DEFER); } +static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name, + struct fwnode_handle *fwnode) +{ + unsigned int index; + int ret; + + if (name) { + ret = device_property_match_string(dev, "io-backend-names", name); + if (ret < 0) + return ERR_PTR(ret); + index = ret; + } else { + index = 0; + } + + return __devm_iio_backend_fwnode_get_by_index(dev, fwnode, index); +} + /** * devm_iio_backend_get - Device managed backend device get * @dev: Consumer device for the backend @@ -1021,6 +1028,22 @@ struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name) } EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get, "IIO_BACKEND"); +/** + * devm_iio_backend_get_by_index - Device managed backend device get by index + * @dev: Consumer device for the backend + * @index: Index of the backend in the io-backends property + * + * Gets the backend at @index associated with @dev. + * + * RETURNS: + * A backend pointer, negative error pointer otherwise. + */ +struct iio_backend *devm_iio_backend_get_by_index(struct device *dev, unsigned int index) +{ + return __devm_iio_backend_fwnode_get_by_index(dev, dev_fwnode(dev), index); +} +EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get_by_index, "IIO_BACKEND"); + /** * devm_iio_backend_fwnode_get - Device managed backend firmware node get * @dev: Consumer device for the backend diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 4d15c2a9802c..3f95ed1fdf9e 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -261,6 +261,7 @@ int iio_backend_extend_chan_spec(struct iio_backend *back, bool iio_backend_has_caps(struct iio_backend *back, u32 caps); void *iio_backend_get_priv(const struct iio_backend *conv); struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name); +struct iio_backend *devm_iio_backend_get_by_index(struct device *dev, unsigned int index); struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev, const char *name, struct fwnode_handle *fwnode); -- 2.43.0