6 files changed, 149 insertions, 0 deletions

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index f81a93e5b59d..c78eb6afd0cb 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -1432,6 +1432,8 @@ static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
 }
 
 struct nfc_ops pn533_nfc_ops = {
+        .dev_up = NULL,
+        .dev_down = NULL,
         .start_poll = pn533_start_poll,
         .stop_poll = pn533_stop_poll,
         .activate_target = pn533_activate_target,
diff --git a/include/linux/nfc.h b/include/linux/nfc.h
index c525e0b5876b..36cb955b05cc 100644
--- a/include/linux/nfc.h
+++ b/include/linux/nfc.h
@@ -39,6 +39,10 @@
  *
  * @NFC_CMD_GET_DEVICE: request information about a device (requires
  *      %NFC_ATTR_DEVICE_INDEX) or dump request to get a list of all nfc devices
+ * @NFC_CMD_DEV_UP: turn on the nfc device
+ *      (requires %NFC_ATTR_DEVICE_INDEX)
+ * @NFC_CMD_DEV_DOWN: turn off the nfc device
+ *      (requires %NFC_ATTR_DEVICE_INDEX)
  * @NFC_CMD_START_POLL: start polling for targets using the given protocols
  *      (requires %NFC_ATTR_DEVICE_INDEX and %NFC_ATTR_PROTOCOLS)
  * @NFC_CMD_STOP_POLL: stop polling for targets (requires
@@ -56,6 +60,8 @@
 enum nfc_commands {
         NFC_CMD_UNSPEC,
         NFC_CMD_GET_DEVICE,
+        NFC_CMD_DEV_UP,
+        NFC_CMD_DEV_DOWN,
         NFC_CMD_START_POLL,
         NFC_CMD_STOP_POLL,
         NFC_CMD_GET_TARGET,
diff --git a/include/net/nfc.h b/include/net/nfc.h
index 87b51fe15b70..6a7f602aa841 100644
--- a/include/net/nfc.h
+++ b/include/net/nfc.h
@@ -48,6 +48,8 @@ typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
                                                                 int err);
 
 struct nfc_ops {
+        int (*dev_up)(struct nfc_dev *dev);
+        int (*dev_down)(struct nfc_dev *dev);
         int (*start_poll)(struct nfc_dev *dev, u32 protocols);
         void (*stop_poll)(struct nfc_dev *dev);
         int (*activate_target)(struct nfc_dev *dev, u32 target_idx,
@@ -78,7 +80,9 @@ struct nfc_dev {
         int targets_generation;
         spinlock_t targets_lock;
         struct device dev;
+        bool dev_up;
         bool polling;
+        bool remote_activated;
         struct nfc_genl_data genl_data;
         u32 supported_protocols;
 
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 284e2f6a14ff..47e02c1b8c02 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -53,6 +53,80 @@ int nfc_printk(const char *level, const char *format, ...)
 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 @@ int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
         }
 
         rc = dev->ops->activate_target(dev, target_idx, protocol);
+        if (!rc)
+                dev->remote_activated = true;
 
 error:
         device_unlock(&dev->dev);
@@ -170,6 +246,7 @@ int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx)
         }
 
         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 ccdff7953f7d..03f8818e1f16 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -367,6 +367,52 @@ out_putdev:
         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 @@ static struct genl_ops nfc_genl_ops[] = {
                 .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 aaf9832298f3..1a877de8e230 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -101,6 +101,10 @@ static inline void nfc_device_iter_exit(struct class_dev_iter *iter)
         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);