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-rw-r--r--include/net/nfc/digital.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h
index 36acecd5f06c..81af21e9bcd4 100644
--- a/include/net/nfc/digital.h
+++ b/include/net/nfc/digital.h
@@ -122,6 +122,16 @@ typedef void (*nfc_digital_cmd_complete_t)(struct nfc_digital_dev *ddev,
* switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
* the device radio on.
* @abort_cmd: Discard the last sent command.
+ *
+ * Notes: Asynchronous functions have a timeout parameter. It is the driver
+ * responsibility to call the digital stack back through the
+ * nfc_digital_cmd_complete_t callback when no RF respsonse has been
+ * received within the specified time (in milliseconds). In that case the
+ * driver must set the resp sk_buff to ERR_PTR(-ETIMEDOUT).
+ * Since the digital stack serializes commands to be sent, it's mandatory
+ * for the driver to handle the timeout correctly. Otherwise the stack
+ * would not be able to send new commands, waiting for the reply of the
+ * current one.
*/
struct nfc_digital_ops {
int (*in_configure_hw)(struct nfc_digital_dev *ddev, int type,