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Subject[PATCH 1/3] regulator: core: Add devres versions of notifier registration
Date
From: Charles Keepax <ckeepax@gmail.com>

Add devm_regulator_register_notifier, this adds the resource against the
device for the consumer supply we are registering the notifier for. There
seem to be few use-cases where this wouldn't be the users intention and
this ensures the notifiers will always be removed at the correct time.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

I have based this series of your ASoC tree Mark, because the
wm8804 patches have dependencies there. But just let me know
if you would rather I send the regulator patch against your
regulator tree.

Thanks,
Charles

drivers/regulator/devres.c | 85 ++++++++++++++++++++++++++++++++++++
include/linux/regulator/consumer.h | 16 +++++++
2 files changed, 101 insertions(+), 0 deletions(-)

diff --git a/drivers/regulator/devres.c b/drivers/regulator/devres.c
index 8f785bc..6ec1d40 100644
--- a/drivers/regulator/devres.c
+++ b/drivers/regulator/devres.c
@@ -413,3 +413,88 @@ void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
devm_regulator_unregister_supply_alias(dev, id[i]);
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_unregister_supply_alias);
+
+struct regulator_notifier_match {
+ struct regulator *regulator;
+ struct notifier_block *nb;
+};
+
+static int devm_regulator_match_notifier(struct device *dev, void *res,
+ void *data)
+{
+ struct regulator_notifier_match *match = res;
+ struct regulator_notifier_match *target = data;
+
+ return match->regulator == target->regulator && match->nb == target->nb;
+}
+
+static void devm_regulator_destroy_notifier(struct device *dev, void *res)
+{
+ struct regulator_notifier_match *match = res;
+
+ regulator_unregister_notifier(match->regulator, match->nb);
+}
+
+/**
+ * devm_regulator_register_notifier - Resource managed
+ * regulator_register_notifier
+ *
+ * @regulator: regulator source
+ * @nb: notifier block
+ *
+ * The notifier will be registers under the consumer device and be
+ * automatically be unregistered when the source device is unbound.
+ */
+int devm_regulator_register_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ struct regulator_notifier_match *match;
+ int ret;
+
+ match = devres_alloc(devm_regulator_destroy_notifier,
+ sizeof(struct regulator_notifier_match),
+ GFP_KERNEL);
+ if (!match)
+ return -ENOMEM;
+
+ match->regulator = regulator;
+ match->nb = nb;
+
+ ret = regulator_register_notifier(regulator, nb);
+ if (ret < 0) {
+ devres_free(match);
+ return ret;
+ }
+
+ devres_add(regulator->dev, match);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);
+
+/**
+ * devm_regulator_unregister_notifier - Resource managed
+ * regulator_unregister_notifier()
+ *
+ * @regulator: regulator source
+ * @nb: notifier block
+ *
+ * Unregister a notifier registered with devm_regulator_register_notifier().
+ * Normally this function will not need to be called and the resource
+ * management code will ensure that the resource is freed.
+ */
+void devm_regulator_unregister_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ struct regulator_notifier_match match;
+ int rc;
+
+ match.regulator = regulator;
+ match.nb = nb;
+
+ rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
+ devm_regulator_match_notifier, &match);
+ if (rc != 0)
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index d17e1ff..bd631ee 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -252,8 +252,12 @@ int regulator_list_hardware_vsel(struct regulator *regulator,
/* regulator notifier block */
int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb);
+int devm_regulator_register_notifier(struct regulator *regulator,
+ struct notifier_block *nb);
int regulator_unregister_notifier(struct regulator *regulator,
struct notifier_block *nb);
+void devm_regulator_unregister_notifier(struct regulator *regulator,
+ struct notifier_block *nb);

/* driver data - core doesn't touch */
void *regulator_get_drvdata(struct regulator *regulator);
@@ -515,12 +519,24 @@ static inline int regulator_register_notifier(struct regulator *regulator,
return 0;
}

+static inline int devm_regulator_register_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ return 0;
+}
+
static inline int regulator_unregister_notifier(struct regulator *regulator,
struct notifier_block *nb)
{
return 0;
}

+static inline int devm_regulator_unregister_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ return 0;
+}
+
static inline void *regulator_get_drvdata(struct regulator *regulator)
{
return NULL;
--
1.7.2.5


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