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authorMark Greer <mgreer@animalcreek.com>2017-06-16 06:34:22 +0300
committerSamuel Ortiz <sameo@linux.intel.com>2017-11-10 02:03:39 +0300
commit4d63adfe12dd9cb61ed8badb4d798955399048c2 (patch)
tree66b92544d76b7033e73a78897169612109eefe29 /include/uapi/linux/nfc.h
parent72ad533acc22870156736c2fef4674c01307695e (diff)
downloadlinux-4d63adfe12dd9cb61ed8badb4d798955399048c2.tar.xz
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>
Diffstat (limited to 'include/uapi/linux/nfc.h')
-rw-r--r--include/uapi/linux/nfc.h2
1 files changed, 2 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
};