NFC: Add basic NCI over SPI

The NFC Forum defines a transport interface based on
Serial Peripheral Interface (SPI) for the NFC Controller
Interface (NCI).

This module implements the SPI transport of NCI, calling SPI module
directly to read/write data to NFC controller (NFCC).

NFCC driver should provide functions performing device open and close.
It should also provide functions asserting/de-asserting interruption
to prevent TX/RX race conditions.
NFCC driver can also fix a delay between transactions if needed by
the hardware.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
index 1009d3dcb316..3b05bebd8235 100644
--- a/include/net/nfc/nci_core.h
+++ b/include/net/nfc/nci_core.h
@@ -3,6 +3,7 @@
  *  NFC Controller (NFCC) and a Device Host (DH).
  *
  *  Copyright (C) 2011 Texas Instruments, Inc.
+ *  Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  *  Written by Ilan Elias <ilane@ti.com>
  *
@@ -202,4 +203,52 @@ void nci_req_complete(struct nci_dev *ndev, int result);
 /* ----- NCI status code ----- */
 int nci_to_errno(__u8 code);
 
+/* ----- NCI over SPI acknowledge modes ----- */
+#define NCI_SPI_CRC_DISABLED    0x00
+#define NCI_SPI_CRC_ENABLED     0x01
+
+/* ----- NCI SPI structures ----- */
+struct nci_spi_dev;
+
+struct nci_spi_ops {
+        int (*open)(struct nci_spi_dev *ndev);
+        int (*close)(struct nci_spi_dev *ndev);
+        void (*assert_int)(struct nci_spi_dev *ndev);
+        void (*deassert_int)(struct nci_spi_dev *ndev);
+};
+
+struct nci_spi_dev {
+        struct nci_dev          *nci_dev;
+        struct spi_device       *spi;
+        struct nci_spi_ops      *ops;
+
+        unsigned int            xfer_udelay;    /* microseconds delay between
+                                                  transactions */
+        u8                      acknowledge_mode;
+
+        void                    *driver_data;
+};
+
+/* ----- NCI SPI Devices ----- */
+struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi,
+                                                struct nci_spi_ops *ops,
+                                                u32 supported_protocols,
+                                                u32 supported_se,
+                                                u8 acknowledge_mode,
+                                                unsigned int delay);
+void nci_spi_free_device(struct nci_spi_dev *ndev);
+int nci_spi_register_device(struct nci_spi_dev *ndev);
+void nci_spi_unregister_device(struct nci_spi_dev *ndev);
+
+static inline void nci_spi_set_drvdata(struct nci_spi_dev *ndev,
+                                            void *data)
+{
+        ndev->driver_data = data;
+}
+
+static inline void *nci_spi_get_drvdata(struct nci_spi_dev *ndev)
+{
+        return ndev->driver_data;
+}
+
 #endif /* __NCI_CORE_H */