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iio: adc: ad7091r5: Add scale and external VREF support
The scale can now be obtained with the "in_voltage_scale" file. By default, the scale returned corresponds to the internal VREF of 2.5V. It is possible to use an external VREF (through the REFIN/REFOUT pin of the chip), by passing a regulator to the driver. The scale will then be calculated according to the voltage reported by the regulator. Signed-off-by: Paul Cercueil <paul.cercueil@analog.com> Co-developed-by: Beniamin Bia <beniamin.bia@analog.com> Signed-off-by: Beniamin Bia <beniamin.bia@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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3 changed files with 44 additions and 0 deletions
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@ -11,6 +11,7 @@
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include "ad7091r-base.h"
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@ -42,6 +43,7 @@ enum ad7091r_mode {
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struct ad7091r_state {
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struct device *dev;
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struct regmap *map;
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struct regulator *vref;
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const struct ad7091r_chip_info *chip_info;
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enum ad7091r_mode mode;
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struct mutex lock; /*lock to prevent concurent reads */
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@ -141,6 +143,21 @@ static int ad7091r_read_raw(struct iio_dev *iio_dev,
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ret = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SCALE:
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if (st->vref) {
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ret = regulator_get_voltage(st->vref);
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if (ret < 0)
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goto unlock;
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*val = ret / 1000;
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} else {
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*val = st->chip_info->vref_mV;
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}
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*val2 = chan->scan_type.realbits;
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ret = IIO_VAL_FRACTIONAL_LOG2;
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break;
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default:
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ret = -EINVAL;
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break;
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@ -183,6 +200,13 @@ static irqreturn_t ad7091r_event_handler(int irq, void *private)
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return IRQ_HANDLED;
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}
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static void ad7091r_remove(void *data)
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{
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struct ad7091r_state *st = data;
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regulator_disable(st->vref);
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}
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int ad7091r_probe(struct device *dev, const char *name,
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const struct ad7091r_chip_info *chip_info,
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struct regmap *map, int irq)
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@ -216,6 +240,20 @@ int ad7091r_probe(struct device *dev, const char *name,
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return ret;
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}
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st->vref = devm_regulator_get_optional(dev, "vref");
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if (IS_ERR(st->vref)) {
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if (PTR_ERR(st->vref) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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st->vref = NULL;
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} else {
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ret = regulator_enable(st->vref);
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if (ret)
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return ret;
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ret = devm_add_action_or_reset(dev, ad7091r_remove, st);
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if (ret)
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return ret;
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}
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/* Use command mode by default to convert only desired channels*/
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ret = ad7091r_set_mode(st, AD7091R_MODE_COMMAND);
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if (ret)
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@ -14,6 +14,7 @@ struct ad7091r_state;
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struct ad7091r_chip_info {
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unsigned int num_channels;
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const struct iio_chan_spec *channels;
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unsigned int vref_mV;
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};
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extern const struct regmap_config ad7091r_regmap_config;
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@ -35,10 +35,13 @@ static const struct iio_event_spec ad7091r5_events[] = {
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#define AD7091R_CHANNEL(idx, bits, ev, num_ev) { \
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.type = IIO_VOLTAGE, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.indexed = 1, \
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.channel = idx, \
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.event_spec = ev, \
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.num_event_specs = num_ev, \
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.scan_type.storagebits = 16, \
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.scan_type.realbits = bits, \
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}
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static const struct iio_chan_spec ad7091r5_channels_irq[] = {
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AD7091R_CHANNEL(0, 12, ad7091r5_events, ARRAY_SIZE(ad7091r5_events)),
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@ -57,11 +60,13 @@ static const struct iio_chan_spec ad7091r5_channels_noirq[] = {
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static const struct ad7091r_chip_info ad7091r5_chip_info_irq = {
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.channels = ad7091r5_channels_irq,
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.num_channels = ARRAY_SIZE(ad7091r5_channels_irq),
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.vref_mV = 2500,
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};
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static const struct ad7091r_chip_info ad7091r5_chip_info_noirq = {
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.channels = ad7091r5_channels_noirq,
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.num_channels = ARRAY_SIZE(ad7091r5_channels_noirq),
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.vref_mV = 2500,
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};
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static int ad7091r5_i2c_probe(struct i2c_client *i2c,
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