[PATCH 5.18 198/879] hwmon: (pmbus) Add get_voltage/set_voltage ops

Greg Kroah-Hartman
2022-06-07T22:32:09Z

From: Mårten Lindahl <marten.lindahl@axis.com>

[ Upstream commit 28bf22ef93eceb42c7583f0909bc9dedc07770e3 ]

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>
Link: https://lore.kernel.org/r/20220503104631.3515715-5-marten.lindahl@axis.com
[groeck: cosmetic alignment / empty line fixes]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hwmon/pmbus/pmbus_core.c | 67 ++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index d93574d6a1fb..5a1796650f5b 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2548,11 +2548,78 @@ 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,
+ .data = -1,
+ };
+ int val = DIV_ROUND_CLOSEST(min_uv, 1000); /* convert to mV */
+ int low, high;
+
+ *selector = 0;
+
+ if (pmbus_check_word_register(client, s.page, PMBUS_MFR_VOUT_MIN))
+ s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_MFR_VOUT_MIN);
+ if (s.data < 0) {
+ s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_VOUT_MARGIN_LOW);
+ if (s.data < 0)
+ return s.data;
+ }
+ low = pmbus_reg2data(data, &s);
+
+ s.data = -1;
+ if (pmbus_check_word_register(client, s.page, PMBUS_MFR_VOUT_MAX))
+ s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_MFR_VOUT_MAX);
+ if (s.data < 0) {
+ s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_VOUT_MARGIN_HIGH);
+ if (s.data < 0)
+ return s.data;
+ }
+ high = pmbus_reg2data(data, &s);
+
+ /* Make sure we are within margins */
+ if (low > val)
+ val = low;
+ if (high < val)
+ val = high;
+
+ val = pmbus_data2reg(data, &s, val);
+
+ return _pmbus_write_word_data(client, s.page, PMBUS_VOUT_COMMAND, (u16)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);

--
2.35.1