linux-kernel - [RFC 6/8] regulator: core: Add regulator_is

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Date:   Wed, 22 Mar 2017 18:53:08 +0200
From:   Leonard Crestez <leonard.crestez@....com>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>
CC:     Leonard Crestez <leonard.crestez@....com>,
        Robin Gong <yibin.gong@....com>,
        Anson Huang <Anson.Huang@....com>,
        Irina Tirdea <irina.tirdea@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Octavian Purdila <octavian.purdila@....com>,
        <linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC 6/8] regulator: core: Add regulator_is_bypass function

This is a simple kernel API to query the bypass state of a regulator.

Signed-off-by: Leonard Crestez <leonard.crestez@....com>
---
 drivers/regulator/core.c           | 26 ++++++++++++++++++++++++++
 include/linux/regulator/consumer.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 9d893aa..7d4f59e 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3554,6 +3554,32 @@ int regulator_allow_bypass(struct regulator *regulator, bool enable)
 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
 
 /**
+ * regulator_is_bypass - Determine if the regulator is in bypass mode
+ *
+ * @regulator: Regulator to examine
+ *
+ * @return 0 or 1 for true/false or errno on failure
+ *
+ * Returns zero on a regulator without bypass support.
+ */
+int regulator_is_bypass(struct regulator *regulator)
+{
+	struct regulator_dev *rdev = regulator->rdev;
+	bool bypass;
+	int ret = 0;
+
+	if (!rdev->desc->ops->get_bypass)
+		return 0;
+
+	mutex_lock(&rdev->mutex);
+	ret = rdev->desc->ops->get_bypass(rdev, &bypass);
+	mutex_unlock(&rdev->mutex);
+
+	return ret ? ret : !!bypass;
+}
+EXPORT_SYMBOL_GPL(regulator_is_bypass);
+
+/**
  * regulator_register_notifier - register regulator event notifier
  * @regulator: regulator source
  * @nb: notifier block
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index ea0fffa..ba78511 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -261,6 +261,7 @@ int regulator_get_error_flags(struct regulator *regulator,
 int regulator_set_load(struct regulator *regulator, int load_uA);
 
 int regulator_allow_bypass(struct regulator *regulator, bool allow);
+int regulator_is_bypass(struct regulator *regulator);
 
 struct regmap *regulator_get_regmap(struct regulator *regulator);
 int regulator_get_hardware_vsel_register(struct regulator *regulator,
-- 
2.7.4