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authorMark Greer <mgreer@animalcreek.com>2017-06-15 20:34:22 -0700
committerSamuel Ortiz <sameo@linux.intel.com>2017-11-10 00:03:39 +0100
commit4d63adfe12dd9cb61ed8badb4d798955399048c2 (patch)
tree66b92544d76b7033e73a78897169612109eefe29
parent72ad533acc22870156736c2fef4674c01307695e (diff)
NFC: Add NFC_CMD_DEACTIVATE_TARGET support
Once an NFC target (i.e., a tag) is found, it remains active until there is a failure reading or writing it (often caused by the target moving out of range). While the target is active, the NFC adapter and antenna must remain powered. This wastes power when the target remains in range but the client application no longer cares whether it is there or not. To mitigate this, add a new netlink command that allows userspace to deactivate an active target. When issued, this command will cause the NFC subsystem to act as though the target was moved out of range. Once the command has been executed, the client application can power off the NFC adapter to reduce power consumption. Signed-off-by: Mark Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--include/uapi/linux/nfc.h2
-rw-r--r--net/nfc/netlink.c29
2 files changed, 31 insertions, 0 deletions
diff --git a/include/uapi/linux/nfc.h b/include/uapi/linux/nfc.h
index 399f39ff8048..f6e3c8c9c744 100644
--- a/include/uapi/linux/nfc.h
+++ b/include/uapi/linux/nfc.h
@@ -89,6 +89,7 @@
* @NFC_CMD_ACTIVATE_TARGET: Request NFC controller to reactivate target.
* @NFC_CMD_VENDOR: Vendor specific command, to be implemented directly
* from the driver in order to support hardware specific operations.
+ * @NFC_CMD_DEACTIVATE_TARGET: Request NFC controller to deactivate target.
*/
enum nfc_commands {
NFC_CMD_UNSPEC,
@@ -121,6 +122,7 @@ enum nfc_commands {
NFC_CMD_SE_IO,
NFC_CMD_ACTIVATE_TARGET,
NFC_CMD_VENDOR,
+ NFC_CMD_DEACTIVATE_TARGET,
/* private: internal use only */
__NFC_CMD_AFTER_LAST
};
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index b251fb936a27..f6359c277212 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -928,6 +928,30 @@ static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
return rc;
}
+static int nfc_genl_deactivate_target(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct nfc_dev *dev;
+ u32 device_idx, target_idx;
+ int rc;
+
+ if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+ return -EINVAL;
+
+ device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+
+ dev = nfc_get_device(device_idx);
+ if (!dev)
+ return -ENODEV;
+
+ target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
+
+ rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
+
+ nfc_put_device(dev);
+ return rc;
+}
+
static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
@@ -1751,6 +1775,11 @@ static const struct genl_ops nfc_genl_ops[] = {
.doit = nfc_genl_vendor_cmd,
.policy = nfc_genl_policy,
},
+ {
+ .cmd = NFC_CMD_DEACTIVATE_TARGET,
+ .doit = nfc_genl_deactivate_target,
+ .policy = nfc_genl_policy,
+ },
};
static struct genl_family nfc_genl_family __ro_after_init = {