From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Wed, 2 Nov 2011 11:39:09 +0000 (+0000)
Subject: regulator: Don't create voltage sysfs entries if we can't read voltage
X-Git-Tag: next-20111110~16^2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a92460dfa57f813f3c6d3820a737a70f77a8892f;p=karo-tx-linux.git

regulator: Don't create voltage sysfs entries if we can't read voltage

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 669d02160221..679f92ec9a45 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;