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authorLaxman Dewangan <ldewangan@nvidia.com>2016-04-06 13:31:06 +0300
committerJonathan Cameron <jic23@kernel.org>2016-04-19 21:58:14 +0300
commit8bf872d8d261feefcdf67027522e3f717cad2bfe (patch)
treed3e646a5e68314e744468fdec20d17c24248785e /drivers/iio/inkern.c
parent5f991a921a08279f573fa5ecf84261a3a6fac0cc (diff)
downloadlinux-8bf872d8d261feefcdf67027522e3f717cad2bfe.tar.xz
iio: core: Add devm_ APIs for iio_channel_{get,release}
Some of kernel driver uses the IIO framework to get the sensor value via ADC or IIO HW driver. The client driver get iio channel by iio_channel_get() and release it by calling iio_channel_release(). Add resource managed version (devm_*) of these APIs so that if client calls the devm_iio_channel_get() then it need not to release it explicitly, it can be done by managed device framework when driver get un-binded. This reduces the code in error path and also need of .remove callback in some cases. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/inkern.c')
-rw-r--r--drivers/iio/inkern.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 2fc7928f401d..9fd8934c1887 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -356,6 +356,54 @@ void iio_channel_release(struct iio_channel *channel)
}
EXPORT_SYMBOL_GPL(iio_channel_release);
+static void devm_iio_channel_free(struct device *dev, void *res)
+{
+ struct iio_channel *channel = *(struct iio_channel **)res;
+
+ iio_channel_release(channel);
+}
+
+static int devm_iio_channel_match(struct device *dev, void *res, void *data)
+{
+ struct iio_channel **r = res;
+
+ if (!r || !*r) {
+ WARN_ON(!r || !*r);
+ return 0;
+ }
+
+ return *r == data;
+}
+
+struct iio_channel *devm_iio_channel_get(struct device *dev,
+ const char *channel_name)
+{
+ struct iio_channel **ptr, *channel;
+
+ ptr = devres_alloc(devm_iio_channel_free, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ channel = iio_channel_get(dev, channel_name);
+ if (IS_ERR(channel)) {
+ devres_free(ptr);
+ return channel;
+ }
+
+ *ptr = channel;
+ devres_add(dev, ptr);
+
+ return channel;
+}
+EXPORT_SYMBOL_GPL(devm_iio_channel_get);
+
+void devm_iio_channel_release(struct device *dev, struct iio_channel *channel)
+{
+ WARN_ON(devres_release(dev, devm_iio_channel_free,
+ devm_iio_channel_match, channel));
+}
+EXPORT_SYMBOL_GPL(devm_iio_channel_release);
+
struct iio_channel *iio_channel_get_all(struct device *dev)
{
const char *name;