From 0737158aabc278526c784f63b8dd8963cdc558a9 Mon Sep 17 00:00:00 2001 From: Olivier Moysan Date: Tue, 30 Jul 2024 10:46:31 +0200 Subject: [PATCH] iio: add read scale and offset services to iio backend framework Add iio_backend_read_scale() and iio_backend_read_offset() services to read channel scale and offset from an IIO backbend device. Also add a read_raw callback which replicates the read_raw callback of the IIO framework, and is intended to request miscellaneous channel attributes from the backend device. Both scale and offset helpers use this callback. Signed-off-by: Olivier Moysan Reviewed-by: Nuno Sa Link: https://patch.msgid.link/20240730084640.1307938-2-olivier.moysan@foss.st.com Signed-off-by: Jonathan Cameron --- drivers/iio/industrialio-backend.c | 19 +++++++++++++++++++ include/linux/iio/backend.h | 24 +++++++++++++++++++++++- 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index 468eadeaf23d..dfaa5f34a7a5 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -502,6 +502,25 @@ int devm_iio_backend_request_buffer(struct device *dev, } EXPORT_SYMBOL_NS_GPL(devm_iio_backend_request_buffer, IIO_BACKEND); +/** + * iio_backend_read_raw - Read a channel attribute from a backend device. + * @back: Backend device + * @chan: IIO channel reference + * @val: First returned value + * @val2: Second returned value + * @mask: Specify the attribute to return + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_read_raw(struct iio_backend *back, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask) +{ + return iio_backend_op_call(back, read_raw, chan, val, val2, mask); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_read_raw, IIO_BACKEND); + static struct iio_backend *iio_backend_from_indio_dev_parent(const struct device *dev) { struct iio_backend *back = ERR_PTR(-ENODEV), *iter; diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 2b9d1aa86552..838092b0de3d 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -3,6 +3,7 @@ #define _IIO_BACKEND_H_ #include +#include struct iio_chan_spec; struct fwnode_handle; @@ -85,6 +86,7 @@ enum iio_backend_sample_trigger { * @extend_chan_spec: Extend an IIO channel. * @ext_info_set: Extended info setter. * @ext_info_get: Extended info getter. + * @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. **/ @@ -119,6 +121,9 @@ struct iio_backend_ops { const char *buf, size_t len); int (*ext_info_get)(struct iio_backend *back, uintptr_t private, const struct iio_chan_spec *chan, char *buf); + int (*read_raw)(struct iio_backend *back, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask); int (*debugfs_print_chan_status)(struct iio_backend *back, unsigned int chan, char *buf, size_t len); @@ -162,7 +167,9 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private, const char *buf, size_t len); 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_read_raw(struct iio_backend *back, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask); int iio_backend_extend_chan_spec(struct iio_backend *back, struct iio_chan_spec *chan); void *iio_backend_get_priv(const struct iio_backend *conv); @@ -174,6 +181,21 @@ __devm_iio_backend_get_from_fwnode_lookup(struct device *dev, int devm_iio_backend_register(struct device *dev, const struct iio_backend_info *info, void *priv); +static inline int iio_backend_read_scale(struct iio_backend *back, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + return iio_backend_read_raw(back, chan, val, val2, IIO_CHAN_INFO_SCALE); +} + +static inline int iio_backend_read_offset(struct iio_backend *back, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + return iio_backend_read_raw(back, chan, val, val2, + IIO_CHAN_INFO_OFFSET); +} + ssize_t iio_backend_debugfs_print_chan_status(struct iio_backend *back, unsigned int chan, char *buf, size_t len); -- 2.25.1