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iio: buffer-callback: allow getting underlying iio_dev

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Add iio_channel_cb_get_iio_dev function to allow getting the
underlying iio_dev. This is useful for setting the trigger of the
consumer ADC device.

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Matt Ranostay 2016-08-19 20:17:02 -07:00 committed by Jonathan Cameron
parent a4fa6509dd
commit adca058b56
2 changed files with 26 additions and 10 deletions
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24
drivers/iio/buffer/industrialio-buffer-cb.c
View file

@ -18,6 +18,7 @@ struct iio_cb_buffer {
int (*cb)(const void *data, void *private);
void *private;
struct iio_channel *channels;
struct iio_dev *indio_dev;
};
static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
@ -52,7 +53,6 @@ struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
{
int ret;
struct iio_cb_buffer *cb_buff;
struct iio_dev *indio_dev;
struct iio_channel *chan;
cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
@ -72,17 +72,17 @@ struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
goto error_free_cb_buff;
}
indio_dev = cb_buff->channels[0].indio_dev;
cb_buff->indio_dev = cb_buff->channels[0].indio_dev;
cb_buff->buffer.scan_mask
= kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
GFP_KERNEL);
= kcalloc(BITS_TO_LONGS(cb_buff->indio_dev->masklength),
sizeof(long), GFP_KERNEL);
if (cb_buff->buffer.scan_mask == NULL) {
ret = -ENOMEM;
goto error_release_channels;
}
chan = &cb_buff->channels[0];
while (chan->indio_dev) {
if (chan->indio_dev != indio_dev) {
if (chan->indio_dev != cb_buff->indio_dev) {
ret = -EINVAL;
goto error_free_scan_mask;
}
@ -105,17 +105,14 @@ EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
{
return iio_update_buffers(cb_buff->channels[0].indio_dev,
&cb_buff->buffer,
return iio_update_buffers(cb_buff->indio_dev, &cb_buff->buffer,
NULL);
}
EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
{
iio_update_buffers(cb_buff->channels[0].indio_dev,
NULL,
&cb_buff->buffer);
iio_update_buffers(cb_buff->indio_dev, NULL, &cb_buff->buffer);
}
EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
@ -133,6 +130,13 @@ struct iio_channel
}
EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);
struct iio_dev
*iio_channel_cb_get_iio_dev(const struct iio_cb_buffer *cb_buffer)
{
return cb_buffer->indio_dev;
}
EXPORT_SYMBOL_GPL(iio_channel_cb_get_iio_dev);
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Industrial I/O callback buffer");
MODULE_LICENSE("GPL");

12
include/linux/iio/consumer.h
View file

@ -164,6 +164,18 @@ void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff);
struct iio_channel
*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer);
/**
* iio_channel_cb_get_iio_dev() - get access to the underlying device.
* @cb_buffer: The callback buffer from whom we want the device
* information.
*
* This function allows one to obtain information about the device.
* The primary aim is to allow drivers that are consuming a device to query
* things like current trigger.
*/
struct iio_dev
*iio_channel_cb_get_iio_dev(const struct iio_cb_buffer *cb_buffer);
/**
* iio_read_channel_raw() - read from a given channel
* @chan: The channel being queried.