[PATCH v5 09/10] iio: adc: ti-ads1262: support REFOUT and VBIAS regulators

[Kurt Borja <kuurtb@gmail.com>]

Register the "refout" and "vbias" regulators to be able to use them as
common mode supplies.

Signed-off-by: Kurt Borja <kuurtb@gmail.com>
---
 drivers/iio/adc/Kconfig      |   1 +
 drivers/iio/adc/ti-ads1262.c | 120 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 121 insertions(+)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 6d5df9c041ac..1d05ba6e9886 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1904,6 +1904,7 @@ config TI_ADS1262
 	tristate "Texas Instruments ADS1262"
 	depends on SPI
 	select REGMAP
+	select REGULATOR
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
diff --git a/drivers/iio/adc/ti-ads1262.c b/drivers/iio/adc/ti-ads1262.c
index 0606e712feec..5bb41b70353f 100644
--- a/drivers/iio/adc/ti-ads1262.c
+++ b/drivers/iio/adc/ti-ads1262.c
@@ -24,6 +24,7 @@
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
 #include <linux/spi/spi.h>
 #include <linux/string.h>
 #include <linux/types.h>
@@ -1122,6 +1123,121 @@ static irqreturn_t ads1262_irq_handler(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static int ads1262_vbias_enable(struct regulator_dev *rdev)
+{
+	struct ads1262 *st = rdev_get_drvdata(rdev);
+
+	guard(mutex)(&st->xfer_lock);
+
+	return regmap_set_bits(st->regmap, ADS1262_POWER_REG,
+			       ADS1262_POWER_VBIAS_MASK);
+}
+
+static int ads1262_vbias_disable(struct regulator_dev *rdev)
+{
+	struct ads1262 *st = rdev_get_drvdata(rdev);
+
+	guard(mutex)(&st->xfer_lock);
+
+	return regmap_clear_bits(st->regmap, ADS1262_POWER_REG,
+				 ADS1262_POWER_VBIAS_MASK);
+}
+
+static int ads1262_vbias_is_enabled(struct regulator_dev *rdev)
+{
+	struct ads1262 *st = rdev_get_drvdata(rdev);
+
+	guard(mutex)(&st->xfer_lock);
+
+	return regmap_test_bits(st->regmap, ADS1262_POWER_REG,
+				ADS1262_POWER_VBIAS_MASK);
+}
+
+static int ads1262_vbias_get_voltage(struct regulator_dev *rdev)
+{
+	struct ads1262 *st = rdev_get_drvdata(rdev);
+
+	if (!st->avdd_uV)
+		return -EINVAL;
+
+	return DIV_ROUND_CLOSEST(st->avdd_uV + st->avss_uV, 2);
+}
+
+static const struct regulator_ops ads1262_vbias_regulator_ops = {
+	.enable = ads1262_vbias_enable,
+	.disable = ads1262_vbias_disable,
+	.is_enabled = ads1262_vbias_is_enabled,
+	.get_voltage = ads1262_vbias_get_voltage,
+};
+
+static int ads1262_refout_is_enabled(struct regulator_dev *rdev)
+{
+	struct ads1262 *st = rdev_get_drvdata(rdev);
+
+	guard(mutex)(&st->xfer_lock);
+
+	return regmap_test_bits(st->regmap, ADS1262_POWER_REG,
+				ADS1262_POWER_INTREF_MASK);
+}
+
+static int ads1262_refout_get_voltage(struct regulator_dev *rdev)
+{
+	struct ads1262 *st = rdev_get_drvdata(rdev);
+
+	/* The internal reference 2.5 V is measured above AVSS */
+	return st->avss_uV + ADS1262_INTERNAL_REFERENCE_uV;
+}
+
+static const struct regulator_ops ads1262_refout_regulator_ops = {
+	.is_enabled = ads1262_refout_is_enabled,
+	.get_voltage = ads1262_refout_get_voltage,
+};
+
+static const struct regulator_desc ads1262_vbias_regulator_desc = {
+	.name = "vbias",
+	.of_match = "vbias",
+	.regulators_node = "regulators",
+	.supply_name = "avdd",
+	.ops = &ads1262_vbias_regulator_ops,
+	.type = REGULATOR_VOLTAGE,
+	.owner = THIS_MODULE,
+};
+
+static const struct regulator_desc ads1262_refout_regulator_desc = {
+	.name = "refout",
+	.of_match = "refout",
+	.regulators_node = "regulators",
+	.supply_name = "avdd",
+	.ops = &ads1262_refout_regulator_ops,
+	.type = REGULATOR_VOLTAGE,
+	.owner = THIS_MODULE,
+};
+
+static int ads1262_register_regulators(struct ads1262 *st)
+{
+	struct device *dev = &st->spi->dev;
+	struct regulator_config config = {
+		.dev = dev,
+		.driver_data = st,
+	};
+	struct regulator_dev *rdev;
+
+	struct fwnode_handle *reg_node __free(fwnode_handle) =
+		device_get_named_child_node(dev, "regulators");
+	if (!reg_node)
+		return 0;
+
+	rdev = devm_regulator_register(dev, &ads1262_refout_regulator_desc,
+				       &config);
+	if (IS_ERR(rdev))
+		return PTR_ERR(rdev);
+
+	rdev = devm_regulator_register(dev, &ads1262_vbias_regulator_desc,
+				       &config);
+
+	return PTR_ERR_OR_ZERO(rdev);
+}
+
 static int ads1262_dev_configure(struct ads1262 *st)
 {
 	struct device *dev = &st->spi->dev;
@@ -1907,6 +2023,10 @@ static int ads1262_spi_probe(struct spi_device *spi)
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to configure device\n");
 
+	ret = ads1262_register_regulators(st);
+	if (ret)
+		return ret;
+
 	ret = ads1262_populate_tables(indio_dev);
 	if (ret)
 		return ret;

-- 
2.55.0