diff options
Diffstat (limited to 'drivers/iio/industrialio-backend.c')
| -rw-r--r-- | drivers/iio/industrialio-backend.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index a43c8d1bb3d0..266e1b29bf91 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -155,11 +155,14 @@ static ssize_t iio_backend_debugfs_write_reg(struct file *file, ssize_t rc; int ret; + if (count >= sizeof(buf)) + return -ENOSPC; + rc = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, count); if (rc < 0) return rc; - buf[count] = '\0'; + buf[rc] = '\0'; ret = sscanf(buf, "%i %i", &back->cached_reg_addr, &val); @@ -381,6 +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 |