NFC: Add dev_up and dev_down control operations
Add 2 new nfc control operations:
dev_up to turn on the nfc device
dev_down to turn off the nfc device
Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 284e2f6..47e02c1 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -53,6 +53,80 @@
EXPORT_SYMBOL(nfc_printk);
/**
+ * nfc_dev_up - turn on the NFC device
+ *
+ * @dev: The nfc device to be turned on
+ *
+ * The device remains up until the nfc_dev_down function is called.
+ */
+int nfc_dev_up(struct nfc_dev *dev)
+{
+ int rc = 0;
+
+ nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->dev_up) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ if (dev->ops->dev_up)
+ rc = dev->ops->dev_up(dev);
+
+ if (!rc)
+ dev->dev_up = true;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_dev_down - turn off the NFC device
+ *
+ * @dev: The nfc device to be turned off
+ */
+int nfc_dev_down(struct nfc_dev *dev)
+{
+ int rc = 0;
+
+ nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ if (dev->polling || dev->remote_activated) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ if (dev->ops->dev_down)
+ dev->ops->dev_down(dev);
+
+ dev->dev_up = false;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
* nfc_start_poll - start polling for nfc targets
*
* @dev: The nfc device that must start polling
@@ -144,6 +218,8 @@
}
rc = dev->ops->activate_target(dev, target_idx, protocol);
+ if (!rc)
+ dev->remote_activated = true;
error:
device_unlock(&dev->dev);
@@ -170,6 +246,7 @@
}
dev->ops->deactivate_target(dev, target_idx);
+ dev->remote_activated = false;
error:
device_unlock(&dev->dev);
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index ccdff79..03f8818 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -367,6 +367,52 @@
return rc;
}
+static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nfc_dev *dev;
+ int rc;
+ u32 idx;
+
+ nfc_dbg("entry");
+
+ if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+ return -EINVAL;
+
+ idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+
+ dev = nfc_get_device(idx);
+ if (!dev)
+ return -ENODEV;
+
+ rc = nfc_dev_up(dev);
+
+ nfc_put_device(dev);
+ return rc;
+}
+
+static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nfc_dev *dev;
+ int rc;
+ u32 idx;
+
+ nfc_dbg("entry");
+
+ if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+ return -EINVAL;
+
+ idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+
+ dev = nfc_get_device(idx);
+ if (!dev)
+ return -ENODEV;
+
+ rc = nfc_dev_down(dev);
+
+ nfc_put_device(dev);
+ return rc;
+}
+
static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
@@ -441,6 +487,16 @@
.policy = nfc_genl_policy,
},
{
+ .cmd = NFC_CMD_DEV_UP,
+ .doit = nfc_genl_dev_up,
+ .policy = nfc_genl_policy,
+ },
+ {
+ .cmd = NFC_CMD_DEV_DOWN,
+ .doit = nfc_genl_dev_down,
+ .policy = nfc_genl_policy,
+ },
+ {
.cmd = NFC_CMD_START_POLL,
.doit = nfc_genl_start_poll,
.policy = nfc_genl_policy,
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index aaf9832..1a877de 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -101,6 +101,10 @@
class_dev_iter_exit(iter);
}
+int nfc_dev_up(struct nfc_dev *dev);
+
+int nfc_dev_down(struct nfc_dev *dev);
+
int nfc_start_poll(struct nfc_dev *dev, u32 protocols);
int nfc_stop_poll(struct nfc_dev *dev);
