NFC: add nfc generic netlink interface
The NFC generic netlink interface exports the NFC control operations
to the user space.
Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 19f8035..c70f607 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -233,12 +233,60 @@
}
EXPORT_SYMBOL(nfc_alloc_skb);
+/**
+ * nfc_targets_found - inform that targets were found
+ *
+ * @dev: The nfc device that found the targets
+ * @targets: array of nfc targets found
+ * @ntargets: targets array size
+ *
+ * The device driver must call this function when one or many nfc targets
+ * are found. After calling this function, the device driver must stop
+ * polling for targets.
+ */
+int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
+ int n_targets)
+{
+ int i;
+
+ nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets);
+
+ dev->polling = false;
+
+ for (i = 0; i < n_targets; i++)
+ targets[i].idx = dev->target_idx++;
+
+ spin_lock_bh(&dev->targets_lock);
+
+ dev->targets_generation++;
+
+ kfree(dev->targets);
+ dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
+ GFP_ATOMIC);
+
+ if (!dev->targets) {
+ dev->n_targets = 0;
+ spin_unlock_bh(&dev->targets_lock);
+ return -ENOMEM;
+ }
+
+ dev->n_targets = n_targets;
+ spin_unlock_bh(&dev->targets_lock);
+
+ nfc_genl_targets_found(dev);
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_targets_found);
+
static void nfc_release(struct device *d)
{
struct nfc_dev *dev = to_nfc_dev(d);
nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+ nfc_genl_data_exit(&dev->genl_data);
+ kfree(dev->targets);
kfree(dev);
}
@@ -298,6 +346,12 @@
dev->ops = ops;
dev->supported_protocols = supported_protocols;
+ spin_lock_init(&dev->targets_lock);
+ nfc_genl_data_init(&dev->genl_data);
+
+ /* first generation must not be 0 */
+ dev->targets_generation = 1;
+
return dev;
}
EXPORT_SYMBOL(nfc_allocate_device);
@@ -318,7 +372,16 @@
rc = device_add(&dev->dev);
mutex_unlock(&nfc_devlist_mutex);
- return rc;
+ if (rc < 0)
+ return rc;
+
+ rc = nfc_genl_device_added(dev);
+ if (rc)
+ nfc_dbg("The userspace won't be notified that the device %s was"
+ " added", dev_name(&dev->dev));
+
+
+ return 0;
}
EXPORT_SYMBOL(nfc_register_device);
@@ -329,6 +392,8 @@
*/
void nfc_unregister_device(struct nfc_dev *dev)
{
+ int rc;
+
nfc_dbg("dev_name=%s", dev_name(&dev->dev));
mutex_lock(&nfc_devlist_mutex);
@@ -341,18 +406,42 @@
device_unlock(&dev->dev);
mutex_unlock(&nfc_devlist_mutex);
+
+ rc = nfc_genl_device_removed(dev);
+ if (rc)
+ nfc_dbg("The userspace won't be notified that the device %s"
+ " was removed", dev_name(&dev->dev));
+
}
EXPORT_SYMBOL(nfc_unregister_device);
static int __init nfc_init(void)
{
+ int rc;
+
nfc_info("NFC Core ver %s", VERSION);
- return class_register(&nfc_class);
+ rc = class_register(&nfc_class);
+ if (rc)
+ return rc;
+
+ rc = nfc_genl_init();
+ if (rc)
+ goto err_genl;
+
+ /* the first generation must not be 0 */
+ nfc_devlist_generation = 1;
+
+ return 0;
+
+err_genl:
+ class_unregister(&nfc_class);
+ return rc;
}
static void __exit nfc_exit(void)
{
+ nfc_genl_exit();
class_unregister(&nfc_class);
}