提交 8a848e75 编写于 作者: P Peter Rosin 提交者: Greg Kroah-Hartman

iio: inkern: api for manipulating ext_info of iio channels

Extend the inkern api with functions for reading and writing ext_info
of iio channels.
Acked-by: NJonathan Cameron <jic23@kernel.org>
Signed-off-by: NPeter Rosin <peda@axentia.se>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 2c089f08
......@@ -869,3 +869,63 @@ int iio_write_channel_raw(struct iio_channel *chan, int val)
return ret;
}
EXPORT_SYMBOL_GPL(iio_write_channel_raw);
unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan)
{
const struct iio_chan_spec_ext_info *ext_info;
unsigned int i = 0;
if (!chan->channel->ext_info)
return i;
for (ext_info = chan->channel->ext_info; ext_info->name; ext_info++)
++i;
return i;
}
EXPORT_SYMBOL_GPL(iio_get_channel_ext_info_count);
static const struct iio_chan_spec_ext_info *iio_lookup_ext_info(
const struct iio_channel *chan,
const char *attr)
{
const struct iio_chan_spec_ext_info *ext_info;
if (!chan->channel->ext_info)
return NULL;
for (ext_info = chan->channel->ext_info; ext_info->name; ++ext_info) {
if (!strcmp(attr, ext_info->name))
return ext_info;
}
return NULL;
}
ssize_t iio_read_channel_ext_info(struct iio_channel *chan,
const char *attr, char *buf)
{
const struct iio_chan_spec_ext_info *ext_info;
ext_info = iio_lookup_ext_info(chan, attr);
if (!ext_info)
return -EINVAL;
return ext_info->read(chan->indio_dev, ext_info->private,
chan->channel, buf);
}
EXPORT_SYMBOL_GPL(iio_read_channel_ext_info);
ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr,
const char *buf, size_t len)
{
const struct iio_chan_spec_ext_info *ext_info;
ext_info = iio_lookup_ext_info(chan, attr);
if (!ext_info)
return -EINVAL;
return ext_info->write(chan->indio_dev, ext_info->private,
chan->channel, buf, len);
}
EXPORT_SYMBOL_GPL(iio_write_channel_ext_info);
......@@ -312,4 +312,41 @@ int iio_read_channel_scale(struct iio_channel *chan, int *val,
int iio_convert_raw_to_processed(struct iio_channel *chan, int raw,
int *processed, unsigned int scale);
/**
* iio_get_channel_ext_info_count() - get number of ext_info attributes
* connected to the channel.
* @chan: The channel being queried
*
* Returns the number of ext_info attributes
*/
unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan);
/**
* iio_read_channel_ext_info() - read ext_info attribute from a given channel
* @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.
*
* Returns the number of bytes written to buf (perhaps w/o zero termination;
* it need not even be a string), or an error code.
*/
ssize_t iio_read_channel_ext_info(struct iio_channel *chan,
const char *attr, char *buf);
/**
* iio_write_channel_ext_info() - write ext_info attribute from a given channel
* @chan: The channel being queried.
* @attr: The ext_info attribute to read.
* @buf: The new attribute value. Strings needs to be zero-
* terminated, but the terminator should not be included
* in the below len.
* @len: The size of the new attribute value.
*
* Returns the number of accepted bytes, which should be the same as len.
* An error code can also be returned.
*/
ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr,
const char *buf, size_t len);
#endif
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