linux-kernel - [PATCH] regulator: Don't create voltage sysfs entries if we can't read voltage

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Message-Id: <1320234513-13150-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Wed,  2 Nov 2011 11:48:32 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Liam Girdwood <lrg@...com>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: Don't create voltage sysfs entries if we can't read voltage

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/regulator/core.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 669d021..dc3b31a 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2503,7 +2503,8 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
 	int			status = 0;
 
 	/* some attributes need specific methods to be displayed */
-	if (ops->get_voltage || ops->get_voltage_sel) {
+	if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
+	    (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) {
 		status = device_create_file(dev, &dev_attr_microvolts);
 		if (status < 0)
 			return status;
-- 
1.7.7.1

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