| Message ID | 20241101112358.22996-3-antoniu.miclaus@analog.com |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | *** Add support for AD485x DAS Family *** | expand |
On 11/1/24 6:23 AM, Antoniu Miclaus wrote: > Add backend support for setting the data size used. > This setting can be adjusted within the IP cores interfacing devices. > > Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> > --- > no changes in v5. > drivers/iio/industrialio-backend.c | 21 +++++++++++++++++++++ > include/linux/iio/backend.h | 3 +++ > 2 files changed, 24 insertions(+) > > diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c > index c792cd1e24e8..6f4e38417dfd 100644 > --- a/drivers/iio/industrialio-backend.c > +++ b/drivers/iio/industrialio-backend.c > @@ -660,6 +660,27 @@ int iio_backend_interface_type_get(struct iio_backend *back, > } > 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. > + */ > +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size) Should be returning int, not size_t. Also, size_t for size parameter seems a bit much when this is taking bits. I don't think anything is ever going to need 5 billion bits. :-p > +{ > + 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_extend_chan_spec - Extend an IIO channel > * @back: Backend device > diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h > index e5ea90f1c3e0..83ca4f0124db 100644 > --- a/include/linux/iio/backend.h > +++ b/include/linux/iio/backend.h > @@ -93,6 +93,7 @@ enum iio_backend_interface_type { > * @ext_info_set: Extended info setter. > * @ext_info_get: Extended info getter. > * @interface_type_get: Interface type. > + * @data_size_set: Data size. > * @read_raw: Read a channel attribute from a backend device > * @debugfs_print_chan_status: Print channel status into a buffer. > * @debugfs_reg_access: Read or write register value of backend. > @@ -130,6 +131,7 @@ struct iio_backend_ops { > const struct iio_chan_spec *chan, char *buf); > int (*interface_type_get)(struct iio_backend *back, > enum iio_backend_interface_type *type); > + int (*data_size_set)(struct iio_backend *back, ssize_t size); > int (*read_raw)(struct iio_backend *back, > struct iio_chan_spec const *chan, int *val, int *val2, > long mask); > @@ -180,6 +182,7 @@ ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private, > const struct iio_chan_spec *chan, char *buf); > int iio_backend_interface_type_get(struct iio_backend *back, > enum iio_backend_interface_type *type); > +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size); This will need to be changed as well. > int iio_backend_read_raw(struct iio_backend *back, > struct iio_chan_spec const *chan, int *val, int *val2, > long mask);
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index c792cd1e24e8..6f4e38417dfd 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -660,6 +660,27 @@ int iio_backend_interface_type_get(struct iio_backend *back, } 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. + */ +size_t iio_backend_data_size_set(struct iio_backend *back, size_t 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_extend_chan_spec - Extend an IIO channel * @back: Backend device diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index e5ea90f1c3e0..83ca4f0124db 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -93,6 +93,7 @@ enum iio_backend_interface_type { * @ext_info_set: Extended info setter. * @ext_info_get: Extended info getter. * @interface_type_get: Interface type. + * @data_size_set: Data size. * @read_raw: Read a channel attribute from a backend device * @debugfs_print_chan_status: Print channel status into a buffer. * @debugfs_reg_access: Read or write register value of backend. @@ -130,6 +131,7 @@ struct iio_backend_ops { const struct iio_chan_spec *chan, char *buf); int (*interface_type_get)(struct iio_backend *back, enum iio_backend_interface_type *type); + int (*data_size_set)(struct iio_backend *back, ssize_t size); int (*read_raw)(struct iio_backend *back, struct iio_chan_spec const *chan, int *val, int *val2, long mask); @@ -180,6 +182,7 @@ ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf); int iio_backend_interface_type_get(struct iio_backend *back, enum iio_backend_interface_type *type); +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size); int iio_backend_read_raw(struct iio_backend *back, struct iio_chan_spec const *chan, int *val, int *val2, long mask);
Add backend support for setting the data size used. This setting can be adjusted within the IP cores interfacing devices. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> --- no changes in v5. drivers/iio/industrialio-backend.c | 21 +++++++++++++++++++++ include/linux/iio/backend.h | 3 +++ 2 files changed, 24 insertions(+)