NFC: digital: Add 'tg_listen_md' and 'tg_get_rf_tech' driver hooks

The digital layer of the NFC subsystem currently
supports a 'tg_listen_mdaa' driver hook that supports
devices that can do mode detection and automatic
anticollision.  However, there are some devices that
can do mode detection but not automatic anitcollision
so add the 'tg_listen_md' hook to support those devices.

In order for the digital layer to get the RF technology
detected by the device from the driver, add the
'tg_get_rf_tech' hook.  It is only valid to call this
hook immediately after a successful call to 'tg_listen_md'.

CC: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h
index 575d668b7852..d9a5cf7ac1c4 100644
--- a/include/net/nfc/digital.h
+++ b/include/net/nfc/digital.h
@@ -127,6 +127,15 @@ typedef void (*nfc_digital_cmd_complete_t)(struct nfc_digital_dev *ddev,
  *	the NFC-DEP ATR_REQ command through cb. The digital stack deducts the RF
  *	tech by analyzing the SoD of the frame containing the ATR_REQ command.
  *	This is an asynchronous function.
+ * @tg_listen_md: If supported, put the device in automatic listen mode with
+ *	mode detection but without automatic anti-collision. In this mode, the
+ *	device automatically detects the RF technology.  What the actual
+ *	RF technology is can be retrieved by calling @tg_get_rf_tech.
+ *	The digital stack will then perform the appropriate anti-collision
+ *	sequence.  This is an asynchronous function.
+ * @tg_get_rf_tech: Required when @tg_listen_md is supported, unused otherwise.
+ *	Return the RF Technology that was detected by the @tg_listen_md call.
+ *	This is a synchronous function.
  *
  * @switch_rf: Turns device radio on or off. The stack does not call explicitly
  *	switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
@@ -161,6 +170,9 @@ struct nfc_digital_ops {
 			      struct digital_tg_mdaa_params *mdaa_params,
 			      u16 timeout, nfc_digital_cmd_complete_t cb,
 			      void *arg);
+	int (*tg_listen_md)(struct nfc_digital_dev *ddev, u16 timeout,
+			    nfc_digital_cmd_complete_t cb, void *arg);
+	int (*tg_get_rf_tech)(struct nfc_digital_dev *ddev, u8 *rf_tech);
 
 	int (*switch_rf)(struct nfc_digital_dev *ddev, bool on);
 	void (*abort_cmd)(struct nfc_digital_dev *ddev);