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authorChanwoo Choi <cw00.choi@samsung.com>2014-04-24 19:46:49 +0900
committerChanwoo Choi <cw00.choi@samsung.com>2014-04-29 09:35:15 +0900
commita9af65223b41cec60cd44fa95a93d10149deb143 (patch)
tree09abb8e2360d0e092bc57360bba53092ddc48886 /drivers/extcon
parentd88cc36704e7583214220a6284a9923768b01d2d (diff)
downloadlwn-a9af65223b41cec60cd44fa95a93d10149deb143.tar.gz
lwn-a9af65223b41cec60cd44fa95a93d10149deb143.zip
extcon: Add extcon_dev_allocate/free() to control the memory of extcon device
This patch add APIs to control the extcon device on extcon provider driver. The extcon_dev_allocate() allocates the memory of extcon device and initializes supported cables. And then extcon_dev_free() decrement the reference of the device of extcon device and free the memory of the extcon device. This APIs must need to implement devm_extcon_dev_allocate()/free() APIs. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-class.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index f6df68989651..654ed52e17c2 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -565,6 +565,42 @@ static void dummy_sysfs_dev_release(struct device *dev)
{
}
+/*
+ * extcon_dev_allocate() - Allocate the memory of extcon device.
+ * @supported_cable: Array of supported cable names ending with NULL.
+ * If supported_cable is NULL, cable name related APIs
+ * are disabled.
+ *
+ * This function allocates the memory for extcon device without allocating
+ * memory in each extcon provider driver and initialize default setting for
+ * extcon device.
+ *
+ * Return the pointer of extcon device if success or ERR_PTR(err) if fail
+ */
+struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
+{
+ struct extcon_dev *edev;
+
+ edev = kzalloc(sizeof(*edev), GFP_KERNEL);
+ if (!edev)
+ return ERR_PTR(-ENOMEM);
+
+ edev->max_supported = 0;
+ edev->supported_cable = supported_cable;
+
+ return edev;
+}
+
+/*
+ * extcon_dev_free() - Free the memory of extcon device.
+ * @edev: the extcon device to free
+ */
+void extcon_dev_free(struct extcon_dev *edev)
+{
+ kfree(edev);
+}
+EXPORT_SYMBOL_GPL(extcon_dev_free);
+
/**
* extcon_dev_register() - Register a new extcon device
* @edev : the new extcon device (should be allocated before calling)