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staging:iio:ad7793: Rework regulator handling

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Rework the regulator handling of the driver to match more closely what we do in
other drivers. Make the regulator non-optional if a external reference is used.
Also dispose the option of specifying the reference voltage via platform data.

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 2012-11-21 16:27:00 +00:00 committed by Jonathan Cameron
parent d21f30c99e
commit dd2c101348
2 changed files with 26 additions and 21 deletions
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44
drivers/staging/iio/adc/ad7793.c
View File

@ -111,7 +111,8 @@ static int ad7793_calibrate_all(struct ad7793_state *st)
}
static int ad7793_setup(struct iio_dev *indio_dev,
const struct ad7793_platform_data *pdata)
const struct ad7793_platform_data *pdata,
unsigned int vref_mv)
{
struct ad7793_state *st = iio_priv(indio_dev);
int i, ret = -1;
@ -175,7 +176,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
/* Populate available ADC input ranges */
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
scale_uv = ((u64)st->int_vref_mv * 100000000)
scale_uv = ((u64)vref_mv * 100000000)
>> (st->chip_info->channels[0].scan_type.realbits -
(!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1));
scale_uv >>= i;
@ -463,7 +464,7 @@ static int ad7793_probe(struct spi_device *spi)
const struct ad7793_platform_data *pdata = spi->dev.platform_data;
struct ad7793_state *st;
struct iio_dev *indio_dev;
int ret, voltage_uv = 0;
int ret, vref_mv = 0;
if (!pdata) {
dev_err(&spi->dev, "no platform data?\n");
@ -483,25 +484,31 @@ static int ad7793_probe(struct spi_device *spi)
ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info);
st->reg = regulator_get(&spi->dev, "vcc");
if (!IS_ERR(st->reg)) {
if (pdata->refsel != AD7793_REFSEL_INTERNAL) {
st->reg = regulator_get(&spi->dev, "refin");
if (IS_ERR(st->reg)) {
ret = PTR_ERR(st->reg);
goto error_device_free;
}
ret = regulator_enable(st->reg);
if (ret)
goto error_put_reg;
voltage_uv = regulator_get_voltage(st->reg);
vref_mv = regulator_get_voltage(st->reg);
if (vref_mv < 0) {
ret = vref_mv;
goto error_disable_reg;
}
vref_mv /= 1000;
} else {
vref_mv = 1170; /* Build-in ref */
}
st->chip_info =
&ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data];
if (pdata && pdata->vref_mv)
st->int_vref_mv = pdata->vref_mv;
else if (voltage_uv)
st->int_vref_mv = voltage_uv / 1000;
else
st->int_vref_mv = 1170; /* Build-in ref */
spi_set_drvdata(spi, indio_dev);
indio_dev->dev.parent = &spi->dev;
@ -515,7 +522,7 @@ static int ad7793_probe(struct spi_device *spi)
if (ret)
goto error_disable_reg;
ret = ad7793_setup(indio_dev, pdata);
ret = ad7793_setup(indio_dev, pdata, vref_mv);
if (ret)
goto error_remove_trigger;
@ -528,12 +535,12 @@ static int ad7793_probe(struct spi_device *spi)
error_remove_trigger:
ad_sd_cleanup_buffer_and_trigger(indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
if (pdata->refsel != AD7793_REFSEL_INTERNAL)
regulator_disable(st->reg);
error_put_reg:
if (!IS_ERR(st->reg))
if (pdata->refsel != AD7793_REFSEL_INTERNAL)
regulator_put(st->reg);
error_device_free:
iio_device_free(indio_dev);
return ret;
@ -541,13 +548,14 @@ static int ad7793_probe(struct spi_device *spi)
static int ad7793_remove(struct spi_device *spi)
{
const struct ad7793_platform_data *pdata = spi->dev.platform_data;
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad7793_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
ad_sd_cleanup_buffer_and_trigger(indio_dev);
if (!IS_ERR(st->reg)) {
if (pdata->refsel != AD7793_REFSEL_INTERNAL) {
regulator_disable(st->reg);
regulator_put(st->reg);
}

3
drivers/staging/iio/adc/ad7793.h
View File

@ -182,7 +182,6 @@ enum ad7793_excitation_current {
/**
* struct ad7793_platform_data - AD7793 platform data
* @vref_mv: Reference voltage in milli-Volt
* @clock_src: Clock source selection
* @burnout_current: If set to true the 100nA burnout current is enabled.
* @boost_enable: Enable boost for the bias voltage generator.
@ -195,8 +194,6 @@ enum ad7793_excitation_current {
* @current_source_direction: Excitation current direction selection
*/
struct ad7793_platform_data {
u16 vref_mv;
enum ad7793_clock_source clock_src;
bool burnout_current;
bool boost_enable;