linux-kernel - [PATCH RFC/RFT] regulator: core: Fix continuous_voltage_range case in regulator_can_change

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Date:	Wed, 12 Dec 2012 09:22:46 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Pawel Moll <pawel.moll@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH RFC/RFT] regulator: core: Fix continuous_voltage_range case
 in regulator_can_change_voltage

Regulator drivers with continuous_voltage_range flag set allows not setting
n_voltages. Thus if continuous_voltage_range is set, check the constraint range
instead.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/regulator/core.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 0f65b24..d7448ad 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1885,9 +1885,15 @@ int regulator_can_change_voltage(struct regulator *regulator)
 	struct regulator_dev	*rdev = regulator->rdev;
 
 	if (rdev->constraints &&
-	    rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE &&
-	    (rdev->desc->n_voltages - rdev->desc->linear_min_sel) > 1)
-		return 1;
+	    (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
+		if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
+			return 1;
+
+		if (rdev->desc->continuous_voltage_range &&
+		    rdev->constraints->min_uV && rdev->constraints->max_uV &&
+		    rdev->constraints->min_uV != rdev->constraints->max_uV)
+			return 1;
+	}
 
 	return 0;
 }
-- 
1.7.9.5



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