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iio:dac:m62332: use dynamic scale 

Some regulators can supply multiple voltages. To take changing voltages
into account, the scale needs to be calculated on every read access.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Hartmut Knaack 2015-08-28 23:59:58 +02:00 committed by Jonathan Cameron
parent acf2f67d05
commit 399910534c
1 changed files with 6 additions and 7 deletions
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13
drivers/iio/dac/m62332.c
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@ -31,7 +31,6 @@
struct m62332_data {
struct i2c_client *client;
u16 vref_mv;
struct regulator *vcc;
struct mutex mutex;
u8 raw[M62332_CHANNELS];
@ -89,11 +88,16 @@ static int m62332_read_raw(struct iio_dev *indio_dev,
long mask)
{
struct m62332_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
/* Corresponds to Vref / 2^(bits) */
*val = data->vref_mv;
ret = regulator_get_voltage(data->vcc);
if (ret < 0)
return ret;
*val = ret / 1000; /* mV */
*val2 = 8;
return IIO_VAL_FRACTIONAL_LOG2;
@ -218,11 +222,6 @@ static int m62332_probe(struct i2c_client *client,
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &m62332_info;
ret = regulator_get_voltage(data->vcc);
if (ret < 0)
return ret;
data->vref_mv = ret / 1000; /* mV */
ret = iio_map_array_register(indio_dev, client->dev.platform_data);
if (ret < 0)
return ret;