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authorChanwoo Choi <cw00.choi@samsung.com>2014-05-09 16:43:08 +0900
committerMyungJoo Ham <myungjoo.ham@samsung.com>2014-05-24 22:33:38 +0900
commit8cd84092d35e52372da2c3c3c2afb1a719917af2 (patch)
treeccb37cbe9e233257050288dbae74c6b3d914b55f /drivers
parent585fc83ece43be63d5775e536f855db33dd752cf (diff)
downloadop-kernel-dev-8cd84092d35e52372da2c3c3c2afb1a719917af2.zip
op-kernel-dev-8cd84092d35e52372da2c3c3c2afb1a719917af2.tar.gz
PM / devfreq: Add resource-managed function for devfreq device
This patch add resource-managed function for devfreq device as following functions. The devm_devfreq_add_device() manages automatically the memory of devfreq device using device resource management. - devm_devfreq_add_device() - devm_devfreq_remove_device() Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/devfreq/devfreq.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index af4af77..8b6295d 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -544,6 +544,69 @@ int devfreq_remove_device(struct devfreq *devfreq)
}
EXPORT_SYMBOL(devfreq_remove_device);
+static int devm_devfreq_dev_match(struct device *dev, void *res, void *data)
+{
+ struct devfreq **r = res;
+
+ if (WARN_ON(!r || !*r))
+ return 0;
+
+ return *r == data;
+}
+
+static void devm_devfreq_dev_release(struct device *dev, void *res)
+{
+ devfreq_remove_device(*(struct devfreq **)res);
+}
+
+/**
+ * devm_devfreq_add_device() - Resource-managed devfreq_add_device()
+ * @dev: the device to add devfreq feature.
+ * @profile: device-specific profile to run devfreq.
+ * @governor_name: name of the policy to choose frequency.
+ * @data: private data for the governor. The devfreq framework does not
+ * touch this value.
+ *
+ * This function manages automatically the memory of devfreq device using device
+ * resource management and simplify the free operation for memory of devfreq
+ * device.
+ */
+struct devfreq *devm_devfreq_add_device(struct device *dev,
+ struct devfreq_dev_profile *profile,
+ const char *governor_name,
+ void *data)
+{
+ struct devfreq **ptr, *devfreq;
+
+ ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ devfreq = devfreq_add_device(dev, profile, governor_name, data);
+ if (IS_ERR(devfreq)) {
+ devres_free(ptr);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ *ptr = devfreq;
+ devres_add(dev, ptr);
+
+ return devfreq;
+}
+EXPORT_SYMBOL(devm_devfreq_add_device);
+
+/**
+ * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
+ * @dev: the device to add devfreq feature.
+ * @devfreq: the devfreq instance to be removed
+ */
+void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq)
+{
+ WARN_ON(devres_release(dev, devm_devfreq_dev_release,
+ devm_devfreq_dev_match, devfreq));
+}
+EXPORT_SYMBOL(devm_devfreq_remove_device);
+
/**
* devfreq_suspend_device() - Suspend devfreq of a device.
* @devfreq: the devfreq instance to be suspended
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