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staging:iio:ad7192: Use iio_validate_scan_mask_onehot

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Only one of the channels of the ad7192 may be sampled at a time. Use the new
validate_scan_mask callback and the iio_validate_scan_mask_onehot function to
implement this restriction. Previously this was implemented using
available_scan_masks, but this requires a individual scan mask for each channel.

Also the previous code was adding the scan index of the timestamp channel to
each available scan mask, this is not required though since the timestamp
channel is not restricted by the available scan masks and can be enabled or
disabled independently. So the new code does not have to take care of this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2012-07-09 10:00:00 +01:00 committed by Jonathan Cameron
parent 8163663205
commit f6aea55430
1 changed files with 2 additions and 8 deletions
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10
drivers/staging/iio/adc/ad7192.c
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@ -146,7 +146,6 @@ struct ad7192_state {
u32 mode;
u32 conf;
u32 scale_avail[8][2];
long available_scan_masks[9];
u8 gpocon;
u8 devid;
/*
@ -538,6 +537,7 @@ static const struct iio_buffer_setup_ops ad7192_ring_setup_ops = {
.postenable = &iio_triggered_buffer_postenable,
.predisable = &iio_triggered_buffer_predisable,
.postdisable = &ad7192_ring_postdisable,
.validate_scan_mask = &iio_validate_scan_mask_onehot,
};
static int ad7192_register_ring_funcs_and_init(struct iio_dev *indio_dev)
@ -984,7 +984,7 @@ static int __devinit ad7192_probe(struct spi_device *spi)
struct ad7192_platform_data *pdata = spi->dev.platform_data;
struct ad7192_state *st;
struct iio_dev *indio_dev;
int ret, i , voltage_uv = 0;
int ret , voltage_uv = 0;
if (!pdata) {
dev_err(&spi->dev, "no platform data?\n");
@ -1028,17 +1028,11 @@ static int __devinit ad7192_probe(struct spi_device *spi)
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ad7192_channels;
indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
indio_dev->available_scan_masks = st->available_scan_masks;
if (st->devid == ID_AD7195)
indio_dev->info = &ad7195_info;
else
indio_dev->info = &ad7192_info;
for (i = 0; i < indio_dev->num_channels; i++)
st->available_scan_masks[i] = (1 << i) | (1 <<
indio_dev->channels[indio_dev->num_channels - 1].
scan_index);
init_waitqueue_head(&st->wq_data_avail);
ret = ad7192_register_ring_funcs_and_init(indio_dev);