diff options
Diffstat (limited to 'include/linux/iio/consumer.h')
| -rw-r--r-- | include/linux/iio/consumer.h | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index e9910b41d48e..5039558267e4 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -131,7 +131,8 @@ struct iio_cb_buffer; /** * iio_channel_get_all_cb() - register callback for triggered capture * @dev: Pointer to client device. - * @cb: Callback function. + * @cb: Callback function. Must be safe to call from any context + * (e.g. must not sleep). * @private: Private data passed to callback. * * NB right now we have no ability to mux data from multiple devices. @@ -382,6 +383,24 @@ int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2); /** + * iio_multiply_value() - Multiply an IIO value + * @result: Destination pointer for the multiplication result + * @multiplier: Multiplier. + * @type: One of the IIO_VAL_* constants. This decides how the @val and + * @val2 parameters are interpreted. + * @val: Value being multiplied. + * @val2: Value being multiplied. @val2 use depends on type. + * + * Multiply an IIO value with a s64 multiplier storing the result as + * IIO_VAL_INT. This is typically used for scaling. + * + * Returns: + * IIO_VAL_INT on success or a negative error-number on failure. + */ +int iio_multiply_value(int *result, s64 multiplier, + unsigned int type, int val, int val2); + +/** * iio_convert_raw_to_processed() - Converts a raw value to a processed value * @chan: The channel being queried * @raw: The raw IIO to convert @@ -418,7 +437,7 @@ unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan); * @chan: The channel being queried. * @attr: The ext_info attribute to read. * @buf: Where to store the attribute value. Assumed to hold - * at least PAGE_SIZE bytes. + * at least PAGE_SIZE bytes and to be aligned at PAGE_SIZE. * * Returns the number of bytes written to buf (perhaps w/o zero termination; * it need not even be a string), or an error code. @@ -441,4 +460,14 @@ ssize_t iio_read_channel_ext_info(struct iio_channel *chan, ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr, const char *buf, size_t len); +/** + * iio_read_channel_label() - read label for a given channel + * @chan: The channel being queried. + * @buf: Where to store the attribute value. Assumed to hold + * at least PAGE_SIZE bytes and to be aligned at PAGE_SIZE. + * + * Returns the number of bytes written to buf, or an error code. + */ +ssize_t iio_read_channel_label(struct iio_channel *chan, char *buf); + #endif |