[PATCH v5 4/4] hwmon: (pmbus) Add get_voltage/set_voltage ops

["Mårten Lindahl" <marten.lindahl@axis.com>]

The pmbus core does not have operations for getting or setting voltage.
Add functions get/set voltage for the dynamic regulator framework.

Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 63 ++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index bd143ca0c320..455d06ba5fdf 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2563,11 +2563,74 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 	return 0;
 }
 
+static int pmbus_regulator_get_voltage(struct regulator_dev *rdev)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	struct pmbus_sensor s = {
+		.page = rdev_get_id(rdev),
+		.class = PSC_VOLTAGE_OUT,
+		.convert = true,
+	};
+
+	s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_READ_VOUT);
+	if (s.data < 0)
+		return s.data;
+
+	return (int)pmbus_reg2data(data, &s) * 1000; /* unit is uV */
+}
+
+static int pmbus_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
+					 int max_uV, unsigned int *selector)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	struct pmbus_sensor s = {
+		.page = rdev_get_id(rdev),
+		.class = PSC_VOLTAGE_OUT,
+		.convert = true,
+	};
+	s64 tmp = DIV_ROUND_CLOSEST_ULL(min_uV, 1000); /* convert to mV */
+	int low = -1, high = -1;
+	u16 val;
+	*selector = 0;
+
+	if (pmbus_check_word_register(client, s.page, PMBUS_MFR_VOUT_MIN))
+		low = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_MFR_VOUT_MIN);
+	if (low < 0) {
+		low = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_VOUT_MARGIN_LOW);
+		if (low < 0)
+			return low;
+	}
+
+	if (pmbus_check_word_register(client, s.page, PMBUS_MFR_VOUT_MAX))
+		high = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_MFR_VOUT_MAX);
+	if (high < 0) {
+		high = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_VOUT_MARGIN_HIGH);
+		if (high < 0)
+			return high;
+	}
+
+	val = pmbus_data2reg(data, &s, tmp);
+
+	/* Make sure we are within margins */
+	if (low > val)
+		val = low;
+	if (high < val)
+		val = high;
+
+	return _pmbus_write_word_data(client, s.page, PMBUS_VOUT_COMMAND, val);
+}
+
 const struct regulator_ops pmbus_regulator_ops = {
 	.enable = pmbus_regulator_enable,
 	.disable = pmbus_regulator_disable,
 	.is_enabled = pmbus_regulator_is_enabled,
 	.get_error_flags = pmbus_regulator_get_error_flags,
+	.get_voltage = pmbus_regulator_get_voltage,
+	.set_voltage = pmbus_regulator_set_voltage,
 };
 EXPORT_SYMBOL_NS_GPL(pmbus_regulator_ops, PMBUS);
 
-- 
2.30.2