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authorStephen Warren <swarren@nvidia.com>2012-04-16 10:51:00 -0600
committerLinus Walleij <linus.walleij@linaro.org>2012-04-18 13:53:13 +0200
commit6d4ca1fb467932773da7b808c52f3d7ef4461ba0 (patch)
tree6e2055564dc75b2c44a3a41daf6ebfcfce326617 /drivers/pinctrl/core.c
parent2aeefe0233174015aef19dc06aac02a1119a44be (diff)
downloadop-kernel-dev-6d4ca1fb467932773da7b808c52f3d7ef4461ba0.zip
op-kernel-dev-6d4ca1fb467932773da7b808c52f3d7ef4461ba0.tar.gz
pinctrl: implement devm_pinctrl_get()/put()
These functions allow the driver core to automatically clean up any allocations made by drivers, thus leading to simplified drivers. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/core.c')
-rw-r--r--drivers/pinctrl/core.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 59027ab..2eaa187 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -23,6 +23,7 @@
#include <linux/sysfs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/machine.h>
#include "core.h"
@@ -801,6 +802,61 @@ int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
}
EXPORT_SYMBOL_GPL(pinctrl_select_state);
+static void devm_pinctrl_release(struct device *dev, void *res)
+{
+ pinctrl_put(*(struct pinctrl **)res);
+}
+
+/**
+ * struct devm_pinctrl_get() - Resource managed pinctrl_get()
+ * @dev: the device to obtain the handle for
+ *
+ * If there is a need to explicitly destroy the returned struct pinctrl,
+ * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
+ */
+struct pinctrl *devm_pinctrl_get(struct device *dev)
+{
+ struct pinctrl **ptr, *p;
+
+ ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ p = pinctrl_get(dev);
+ if (!IS_ERR(p)) {
+ *ptr = p;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return p;
+}
+EXPORT_SYMBOL_GPL(devm_pinctrl_get);
+
+static int devm_pinctrl_match(struct device *dev, void *res, void *data)
+{
+ struct pinctrl **p = res;
+
+ return *p == data;
+}
+
+/**
+ * devm_pinctrl_put() - Resource managed pinctrl_put()
+ * @p: the pinctrl handle to release
+ *
+ * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
+ * this function will not need to be called and the resource management
+ * code will ensure that the resource is freed.
+ */
+void devm_pinctrl_put(struct pinctrl *p)
+{
+ WARN_ON(devres_destroy(p->dev, devm_pinctrl_release,
+ devm_pinctrl_match, p));
+ pinctrl_put(p);
+}
+EXPORT_SYMBOL_GPL(devm_pinctrl_put);
+
int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
bool dup, bool locked)
{
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