diff options
Diffstat (limited to 'drivers/iio/industrialio-backend.c')
| -rw-r--r-- | drivers/iio/industrialio-backend.c | 95 |
1 files changed, 94 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index 363281272035..266e1b29bf91 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -155,10 +155,15 @@ static ssize_t iio_backend_debugfs_write_reg(struct file *file, ssize_t rc; int ret; - rc = simple_write_to_buffer(buf, sizeof(buf), ppos, userbuf, count); + if (count >= sizeof(buf)) + return -ENOSPC; + + rc = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, count); if (rc < 0) return rc; + buf[rc] = '\0'; + ret = sscanf(buf, "%i %i", &back->cached_reg_addr, &val); switch (ret) { @@ -379,6 +384,34 @@ int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan, EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_set, "IIO_BACKEND"); /** + * iio_backend_data_source_get - Get current data source + * @back: Backend device + * @chan: Channel number + * @data: Pointer to receive the current source value + * + * A given backend may have different sources to stream/sync data. This allows + * to know what source is in use. + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan, + enum iio_backend_data_source *data) +{ + int ret; + + ret = iio_backend_op_call(back, data_source_get, chan, data); + if (ret) + return ret; + + if (*data >= IIO_BACKEND_DATA_SOURCE_MAX) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_get, "IIO_BACKEND"); + +/** * iio_backend_set_sampling_freq - Set channel sampling rate * @back: Backend device * @chan: Channel number @@ -637,6 +670,66 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private, EXPORT_SYMBOL_NS_GPL(iio_backend_ext_info_set, "IIO_BACKEND"); /** + * iio_backend_interface_type_get - get the interface type used. + * @back: Backend device + * @type: Interface type + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_interface_type_get(struct iio_backend *back, + enum iio_backend_interface_type *type) +{ + int ret; + + ret = iio_backend_op_call(back, interface_type_get, type); + if (ret) + return ret; + + if (*type >= IIO_BACKEND_INTERFACE_MAX) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, "IIO_BACKEND"); + +/** + * iio_backend_data_size_set - set the data width/size in the data bus. + * @back: Backend device + * @size: Size in bits + * + * Some frontend devices can dynamically control the word/data size on the + * interface/data bus. Hence, the backend device needs to be aware of it so + * data can be correctly transferred. + * + * Return: + * 0 on success, negative error number on failure. + */ +int iio_backend_data_size_set(struct iio_backend *back, unsigned int size) +{ + if (!size) + return -EINVAL; + + return iio_backend_op_call(back, data_size_set, size); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, "IIO_BACKEND"); + +/** + * iio_backend_oversampling_ratio_set - set the oversampling ratio + * @back: Backend device + * @ratio: The oversampling ratio - value 1 corresponds to no oversampling. + * + * Return: + * 0 on success, negative error number on failure. + */ +int iio_backend_oversampling_ratio_set(struct iio_backend *back, + unsigned int ratio) +{ + return iio_backend_op_call(back, oversampling_ratio_set, ratio); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_oversampling_ratio_set, "IIO_BACKEND"); + +/** * iio_backend_extend_chan_spec - Extend an IIO channel * @back: Backend device * @chan: IIO channel |