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iio: adc: ti-adc161s626: add regulator support 

Allow IIO_CHAN_INFO_SCALE and IIO_CHAN_INFO_OFFSET attributes for
processing by checking voltage from a regulator.

Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
Matt Ranostay 2016-09-18 15:42:15 -07:00 committed by Jonathan Cameron
parent 0023e67dd8
commit 92f0afb5b2
2 changed files with 46 additions and 11 deletions
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2
Documentation/devicetree/bindings/iio/adc/ti-adc161s626.txt
View File

@ -3,6 +3,7 @@
Required properties:
- compatible: Should be "ti,adc141s626" or "ti,adc161s626"
- reg: spi chip select number for the device
- vdda-supply: supply voltage to VDDA pin
Recommended properties:
- spi-max-frequency: Definition as per
@ -11,6 +12,7 @@ Recommended properties:
Example:
adc@0 {
compatible = "ti,adc161s626";
vdda-supply = <&vdda_fixed>;
reg = <0>;
spi-max-frequency = <4300000>;
};

55
drivers/iio/adc/ti-adc161s626.c
View File

@ -27,6 +27,7 @@
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/regulator/consumer.h>
#define TI_ADC_DRV_NAME "ti-adc161s626"
@ -39,7 +40,9 @@ static const struct iio_chan_spec ti_adc141s626_channels[] = {
{
.type = IIO_VOLTAGE,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
.scan_index = 0,
.scan_type = {
.sign = 's',
@ -54,7 +57,9 @@ static const struct iio_chan_spec ti_adc161s626_channels[] = {
{
.type = IIO_VOLTAGE,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
.scan_index = 0,
.scan_type = {
.sign = 's',
@ -68,6 +73,8 @@ static const struct iio_chan_spec ti_adc161s626_channels[] = {
struct ti_adc_data {
struct iio_dev *indio_dev;
struct spi_device *spi;
struct regulator *ref;
u8 read_size;
u8 shift;
@ -135,18 +142,32 @@ static int ti_adc_read_raw(struct iio_dev *indio_dev,
struct ti_adc_data *data = iio_priv(indio_dev);
int ret;
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = ti_adc_read_measurement(data, chan, val);
iio_device_release_direct_mode(indio_dev);
ret = ti_adc_read_measurement(data, chan, val);
iio_device_release_direct_mode(indio_dev);
if (ret)
return ret;
if (!ret)
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = regulator_get_voltage(data->ref);
if (ret < 0)
return ret;
*val = ret / 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_OFFSET:
*val = 1 << (chan->scan_type.realbits - 1);
return IIO_VAL_INT;
}
return 0;
}
@ -191,10 +212,17 @@ static int ti_adc_probe(struct spi_device *spi)
break;
}
data->ref = devm_regulator_get(&spi->dev, "vdda");
if (!IS_ERR(data->ref)) {
ret = regulator_enable(data->ref);
if (ret < 0)
return ret;
}
ret = iio_triggered_buffer_setup(indio_dev, NULL,
ti_adc_trigger_handler, NULL);
if (ret)
return ret;
goto error_regulator_disable;
ret = iio_device_register(indio_dev);
if (ret)
@ -205,15 +233,20 @@ static int ti_adc_probe(struct spi_device *spi)
error_unreg_buffer:
iio_triggered_buffer_cleanup(indio_dev);
error_regulator_disable:
regulator_disable(data->ref);
return ret;
}
static int ti_adc_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ti_adc_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
regulator_disable(data->ref);
return 0;
}