diff options
author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-10-19 15:19:19 -0400 |
---|---|---|
committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-10-19 15:19:19 -0400 |
commit | e05dacd71db0a5da7c1a44bcaab2a8a240b9c233 (patch) | |
tree | 31382cf1c7d62c03126448affb2fc86e8c4aaa8b /include/linux/iio/consumer.h | |
parent | xen: arm: comment on why 64-bit xen_pfn_t is safe even on 32 bit (diff) | |
parent | Linux 3.7-rc1 (diff) | |
download | linux-dev-e05dacd71db0a5da7c1a44bcaab2a8a240b9c233.tar.xz linux-dev-e05dacd71db0a5da7c1a44bcaab2a8a240b9c233.zip |
Merge commit 'v3.7-rc1' into stable/for-linus-3.7
* commit 'v3.7-rc1': (10892 commits)
Linux 3.7-rc1
x86, boot: Explicitly include autoconf.h for hostprogs
perf: Fix UAPI fallout
ARM: config: make sure that platforms are ordered by option string
ARM: config: sort select statements alphanumerically
UAPI: (Scripted) Disintegrate include/linux/byteorder
UAPI: (Scripted) Disintegrate include/linux
UAPI: Unexport linux/blk_types.h
UAPI: Unexport part of linux/ppp-comp.h
perf: Handle new rbtree implementation
procfs: don't need a PATH_MAX allocation to hold a string representation of an int
vfs: embed struct filename inside of names_cache allocation if possible
audit: make audit_inode take struct filename
vfs: make path_openat take a struct filename pointer
vfs: turn do_path_lookup into wrapper around struct filename variant
audit: allow audit code to satisfy getname requests from its names_list
vfs: define struct filename and have getname() return it
btrfs: Fix compilation with user namespace support enabled
userns: Fix posix_acl_file_xattr_userns gid conversion
userns: Properly print bluetooth socket uids
...
Diffstat (limited to 'include/linux/iio/consumer.h')
-rw-r--r-- | include/linux/iio/consumer.h | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index e2657e6d4d26..e875bcf0478f 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -8,7 +8,7 @@ * the Free Software Foundation. */ #ifndef _IIO_INKERN_CONSUMER_H_ -#define _IIO_INKERN_CONSUMER_H +#define _IIO_INKERN_CONSUMER_H_ #include <linux/iio/types.h> struct iio_dev; @@ -61,7 +61,7 @@ void iio_channel_release_all(struct iio_channel *chan); /** * iio_read_channel_raw() - read from a given channel - * @channel: The channel being queried. + * @chan: The channel being queried. * @val: Value read back. * * Note raw reads from iio channels are in adc counts and hence @@ -71,6 +71,21 @@ int iio_read_channel_raw(struct iio_channel *chan, int *val); /** + * iio_read_channel_processed() - read processed value from a given channel + * @chan: The channel being queried. + * @val: Value read back. + * + * Returns an error code or 0. + * + * This function will read a processed value from a channel. A processed value + * means that this value will have the correct unit and not some device internal + * representation. If the device does not support reporting a processed value + * the function will query the raw value and the channels scale and offset and + * do the appropriate transformation. + */ +int iio_read_channel_processed(struct iio_channel *chan, int *val); + +/** * iio_get_channel_type() - get the type of a channel * @channel: The channel being queried. * @type: The type of the channel. @@ -82,7 +97,7 @@ int iio_get_channel_type(struct iio_channel *channel, /** * iio_read_channel_scale() - read the scale value for a channel - * @channel: The channel being queried. + * @chan: The channel being queried. * @val: First part of value read back. * @val2: Second part of value read back. * @@ -93,4 +108,27 @@ int iio_get_channel_type(struct iio_channel *channel, int iio_read_channel_scale(struct iio_channel *chan, 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 + * @processed: The result of the conversion + * @scale: Scale factor to apply during the conversion + * + * Returns an error code or 0. + * + * This function converts a raw value to processed value for a specific channel. + * A raw value is the device internal representation of a sample and the value + * returned by iio_read_channel_raw, so the unit of that value is device + * depended. A processed value on the other hand is value has a normed unit + * according with the IIO specification. + * + * The scale factor allows to increase the precession of the returned value. For + * a scale factor of 1 the function will return the result in the normal IIO + * unit for the channel type. E.g. millivolt for voltage channels, if you want + * nanovolts instead pass 1000 as the scale factor. + */ +int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, + int *processed, unsigned int scale); + #endif |