[PATCH 5.15 034/245] regulator: pwm-regulator: Add validity checks in continuous .get_voltage

Greg Kroah-Hartman
2024-02-27T14:03:47Z

From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

[ Upstream commit c92688cac239794e4a1d976afa5203a4d3a2ac0e ]

Continuous regulators can be configured to operate only in a certain
duty cycle range (for example from 0..91%). Add a check to error out if
the duty cycle translates to an unsupported (or out of range) voltage.

Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://msgid.link/r/20240113224628.377993-2-martin.blumenstingl@googlemail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/regulator/pwm-regulator.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index 7629476d94aeb..f4d9d9455dea6 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -158,6 +158,9 @@ static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
pwm_get_state(drvdata->pwm, &pstate);

voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit);
+ if (voltage < min(max_uV_duty, min_uV_duty) ||
+ voltage > max(max_uV_duty, min_uV_duty))
+ return -ENOTRECOVERABLE;

/*
* The dutycycle for min_uV might be greater than the one for max_uV.
--
2.43.0