/**
* ad7606_poll_bh_to_ring() bh of trigger launched polling to ring buffer
* @work_s: the work struct through which this was scheduled
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
* I think the one copy of this at a time was to avoid problems if the
* trigger was set far too high and the reads then locked up the computer.
**/
static void ad7606_poll_bh_to_ring(struct work_struct *work_s)
{
struct ad7606_state *st = container_of(work_s, struct ad7606_state,
poll_work);
struct iio_dev *indio_dev = iio_priv_to_dev(st);
struct iio_buffer *ring = indio_dev->buffer;
s64 time_ns;
__u8 *buf;
int ret;
buf = kzalloc(ring->access->get_bytes_per_datum(ring),
GFP_KERNEL);
if (buf == NULL)
return;
if (gpio_is_valid(st->pdata->gpio_frstdata)) {
ret = st->bops->read_block(st->dev, 1, buf);
if (ret)
goto done;
if (!gpio_get_value(st->pdata->gpio_frstdata)) {
/* This should never happen. However
* some signal glitch caused by bad PCB desgin or
* electrostatic discharge, could cause an extra read
* or clock. This allows recovery.
*/
ad7606_reset(st);
goto done;
}
ret = st->bops->read_block(st->dev,
st->chip_info->num_channels - 1, buf + 2);
if (ret)
goto done;
} else {
ret = st->bops->read_block(st->dev,
st->chip_info->num_channels, buf);
if (ret)
goto done;
}
time_ns = iio_get_time_ns();
if (ring->scan_timestamp)
*((s64 *)(buf + ring->access->get_bytes_per_datum(ring) -
sizeof(s64))) = time_ns;
ring->access->store_to(indio_dev->buffer, buf, time_ns);
done:
gpio_set_value(st->pdata->gpio_convst, 0);
iio_trigger_notify_done(indio_dev->trig);
kfree(buf);
}
static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned ch)
{
struct ad7606_state *st = iio_priv(indio_dev);
int ret;
st->done = false;
gpio_set_value(st->pdata->gpio_convst, 1);
ret = wait_event_interruptible(st->wq_data_avail, st->done);
if (ret)
goto error_ret;
if (gpio_is_valid(st->pdata->gpio_frstdata)) {
ret = st->bops->read_block(st->dev, 1, st->data);
if (ret)
goto error_ret;
if (!gpio_get_value(st->pdata->gpio_frstdata)) {
/* This should never happen */
ad7606_reset(st);
ret = -EIO;
goto error_ret;
}
ret = st->bops->read_block(st->dev,
st->chip_info->num_channels - 1, &st->data[1]);
if (ret)
goto error_ret;
} else {
ret = st->bops->read_block(st->dev,
st->chip_info->num_channels, st->data);
if (ret)
goto error_ret;
}
ret = st->data[ch];
error_ret:
gpio_set_value(st->pdata->gpio_convst, 0);
return ret;
}
