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NFC: Add basic NCI over SPI

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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>
This commit is contained in:
Frederic Danis
2013-05-29 15:35:02 +02:00
committed by Samuel Ortiz
parent a395298c9c
commit 8a00a61b0e
4 changed files with 198 additions and 1 deletions
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49
include/net/nfc/nci_core.h
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@@ -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 */