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staging:iio: make iio_sw_buffer_preenable much more general. 

Also introduces active_scan_mask storage to tell the core what is
really being currently captured from the device (different from
what is desired as often has bonus channels).

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron 2011-12-05 21:37:13 +00:00 committed by Greg Kroah-Hartman
parent 4d5f8d3db5
commit 959d2952d1
2 changed files with 39 additions and 26 deletions
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2
drivers/staging/iio/iio.h
View File

@ -280,6 +280,7 @@ struct iio_info {
* @available_scan_masks: [DRIVER] optional array of allowed bitmasks
* @masklength: [INTERN] the length of the mask established from
* channels
* @active_scan_mask: [INTERN] union of all scan masks requested by buffers
* @trig: [INTERN] current device trigger (buffer modes)
* @pollfunc: [DRIVER] function run on trigger being received
* @channels: [DRIVER] channel specification structure table
@ -307,6 +308,7 @@ struct iio_dev {
unsigned long *available_scan_masks;
unsigned masklength;
unsigned long *active_scan_mask;
struct iio_trigger *trig;
struct iio_poll_func *pollfunc;

63
drivers/staging/iio/industrialio-buffer.c
View File

@ -531,32 +531,6 @@ ssize_t iio_buffer_show_enable(struct device *dev,
}
EXPORT_SYMBOL(iio_buffer_show_enable);
int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
{
struct iio_buffer *buffer = indio_dev->buffer;
size_t size;
dev_dbg(&indio_dev->dev, "%s\n", __func__);
/* Check if there are any scan elements enabled, if not fail*/
if (!(buffer->scan_count || buffer->scan_timestamp))
return -EINVAL;
if (buffer->scan_timestamp)
if (buffer->scan_count)
/* Timestamp (aligned to s64) and data */
size = (((buffer->scan_count * buffer->bpe)
+ sizeof(s64) - 1)
& ~(sizeof(s64) - 1))
+ sizeof(s64);
else /* Timestamp only */
size = sizeof(s64);
else /* Data only */
size = buffer->scan_count * buffer->bpe;
buffer->access->set_bytes_per_datum(buffer, size);
return 0;
}
EXPORT_SYMBOL(iio_sw_buffer_preenable);
/* note NULL used as error indicator as it doesn't make sense. */
static unsigned long *iio_scan_mask_match(unsigned long *av_masks,
unsigned int masklength,
@ -572,6 +546,43 @@ static unsigned long *iio_scan_mask_match(unsigned long *av_masks,
return NULL;
}
int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
{
struct iio_buffer *buffer = indio_dev->buffer;
const struct iio_chan_spec *ch;
unsigned bytes = 0;
int length, i;
dev_dbg(&indio_dev->dev, "%s\n", __func__);
/* How much space will the demuxed element take? */
for_each_set_bit(i, buffer->scan_mask,
indio_dev->masklength) {
ch = iio_find_channel_from_si(indio_dev, i);
length = ch->scan_type.storagebits/8;
bytes = ALIGN(bytes, length);
bytes += length;
}
if (buffer->scan_timestamp) {
ch = iio_find_channel_from_si(indio_dev,
buffer->scan_index_timestamp);
length = ch->scan_type.storagebits/8;
bytes = ALIGN(bytes, length);
bytes += length;
}
buffer->access->set_bytes_per_datum(buffer, bytes);
/* What scan mask do we actually have ?*/
if (indio_dev->available_scan_masks)
indio_dev->active_scan_mask =
iio_scan_mask_match(indio_dev->available_scan_masks,
indio_dev->masklength,
buffer->scan_mask);
else
indio_dev->active_scan_mask = buffer->scan_mask;
return 0;
}
EXPORT_SYMBOL(iio_sw_buffer_preenable);
/**
* iio_scan_mask_set() - set particular bit in the scan mask
* @buffer: the buffer whose scan mask we are interested in