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authorLars-Peter Clausen <lars@metafoo.de>2013-03-01 13:07:00 +0000
committerJonathan Cameron <jic23@kernel.org>2013-03-02 16:29:14 +0000
commitf77ae9d8fd4b8ed984f33e996c62f2dfd9f73b37 (patch)
tree45f529914fb1397d2dc6fd9b39527741c49209bf /drivers/iio
parentc5ef717a774b326a6708e2e14ddf9957b619d5c4 (diff)
iio:ad5064: Initialize register cache correctly
Initialize the register cache to the proper mid-scale value based on the resolution of the device. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/dac/ad5064.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/iio/dac/ad5064.c b/drivers/iio/dac/ad5064.c
index f724a54bf334..74f2d52795f6 100644
--- a/drivers/iio/dac/ad5064.c
+++ b/drivers/iio/dac/ad5064.c
@@ -438,6 +438,7 @@ static int ad5064_probe(struct device *dev, enum ad5064_type type,
{
struct iio_dev *indio_dev;
struct ad5064_state *st;
+ unsigned int midscale;
unsigned int i;
int ret;
@@ -474,11 +475,6 @@ static int ad5064_probe(struct device *dev, enum ad5064_type type,
goto error_free_reg;
}
- for (i = 0; i < st->chip_info->num_channels; ++i) {
- st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
- st->dac_cache[i] = 0x8000;
- }
-
indio_dev->dev.parent = dev;
indio_dev->name = name;
indio_dev->info = &ad5064_info;
@@ -486,6 +482,13 @@ static int ad5064_probe(struct device *dev, enum ad5064_type type,
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = st->chip_info->num_channels;
+ midscale = (1 << indio_dev->channels[0].scan_type.realbits) / 2;
+
+ for (i = 0; i < st->chip_info->num_channels; ++i) {
+ st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
+ st->dac_cache[i] = midscale;
+ }
+
ret = iio_device_register(indio_dev);
if (ret)
goto error_disable_reg;