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>
This commit is contained in:
Frederic Danis
Samuel Ortiz
parent
a395298c9c
commit
8a00a61b0e
|
|
@ -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 */
|
||||
|
|
|
|||
|
|
@ -8,3 +8,13 @@ config NFC_NCI
|
|||
|
||||
Say Y here to compile NCI support into the kernel or say M to
|
||||
compile it as module (nci).
|
||||
|
||||
config NFC_NCI_SPI
|
||||
depends on NFC_NCI && SPI
|
||||
bool "NCI over SPI protocol support"
|
||||
default n
|
||||
help
|
||||
NCI (NFC Controller Interface) is a communication protocol between
|
||||
an NFC Controller (NFCC) and a Device Host (DH).
|
||||
|
||||
Say yes if you use an NCI driver that requires SPI link layer.
|
||||
|
|
|
|||
|
|
@ -4,4 +4,6 @@
|
|||
|
||||
obj-$(CONFIG_NFC_NCI) += nci.o
|
||||
|
||||
nci-objs := core.o data.o lib.o ntf.o rsp.o
|
||||
nci-objs := core.o data.o lib.o ntf.o rsp.o
|
||||
|
||||
nci-$(CONFIG_NFC_NCI_SPI) += spi.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,136 @@
|
|||
/*
|
||||
* Copyright (C) 2013 Intel Corporation. All rights reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along with
|
||||
* this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "nci_spi: %s: " fmt, __func__
|
||||
|
||||
#include <linux/export.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/nfc.h>
|
||||
#include <net/nfc/nci_core.h>
|
||||
|
||||
#define NCI_SPI_HDR_LEN 4
|
||||
#define NCI_SPI_CRC_LEN 2
|
||||
|
||||
static int nci_spi_open(struct nci_dev *nci_dev)
|
||||
{
|
||||
struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
|
||||
|
||||
return ndev->ops->open(ndev);
|
||||
}
|
||||
|
||||
static int nci_spi_close(struct nci_dev *nci_dev)
|
||||
{
|
||||
struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
|
||||
|
||||
return ndev->ops->close(ndev);
|
||||
}
|
||||
|
||||
static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct nci_ops nci_spi_ops = {
|
||||
.open = nci_spi_open,
|
||||
.close = nci_spi_close,
|
||||
.send = nci_spi_send,
|
||||
};
|
||||
|
||||
/* ---- Interface to NCI SPI drivers ---- */
|
||||
|
||||
/**
|
||||
* nci_spi_allocate_device - allocate a new nci spi device
|
||||
*
|
||||
* @spi: SPI device
|
||||
* @ops: device operations
|
||||
* @supported_protocols: NFC protocols supported by the device
|
||||
* @supported_se: NFC Secure Elements supported by the device
|
||||
* @acknowledge_mode: Acknowledge mode used by the device
|
||||
* @delay: delay between transactions in us
|
||||
*/
|
||||
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)
|
||||
{
|
||||
struct nci_spi_dev *ndev;
|
||||
int tailroom = 0;
|
||||
|
||||
if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int)
|
||||
return NULL;
|
||||
|
||||
if (!supported_protocols)
|
||||
return NULL;
|
||||
|
||||
ndev = devm_kzalloc(&spi->dev, sizeof(struct nci_dev), GFP_KERNEL);
|
||||
if (!ndev)
|
||||
return NULL;
|
||||
|
||||
ndev->ops = ops;
|
||||
ndev->acknowledge_mode = acknowledge_mode;
|
||||
ndev->xfer_udelay = delay;
|
||||
|
||||
if (acknowledge_mode == NCI_SPI_CRC_ENABLED)
|
||||
tailroom += NCI_SPI_CRC_LEN;
|
||||
|
||||
ndev->nci_dev = nci_allocate_device(&nci_spi_ops, supported_protocols,
|
||||
supported_se, NCI_SPI_HDR_LEN,
|
||||
tailroom);
|
||||
if (!ndev->nci_dev)
|
||||
return NULL;
|
||||
|
||||
nci_set_drvdata(ndev->nci_dev, ndev);
|
||||
|
||||
return ndev;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nci_spi_allocate_device);
|
||||
|
||||
/**
|
||||
* nci_spi_free_device - deallocate nci spi device
|
||||
*
|
||||
* @ndev: The nci spi device to deallocate
|
||||
*/
|
||||
void nci_spi_free_device(struct nci_spi_dev *ndev)
|
||||
{
|
||||
nci_free_device(ndev->nci_dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nci_spi_free_device);
|
||||
|
||||
/**
|
||||
* nci_spi_register_device - register a nci spi device in the nfc subsystem
|
||||
*
|
||||
* @pdev: The nci spi device to register
|
||||
*/
|
||||
int nci_spi_register_device(struct nci_spi_dev *ndev)
|
||||
{
|
||||
return nci_register_device(ndev->nci_dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nci_spi_register_device);
|
||||
|
||||
/**
|
||||
* nci_spi_unregister_device - unregister a nci spi device in the nfc subsystem
|
||||
*
|
||||
* @dev: The nci spi device to unregister
|
||||
*/
|
||||
void nci_spi_unregister_device(struct nci_spi_dev *ndev)
|
||||
{
|
||||
nci_unregister_device(ndev->nci_dev);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nci_spi_unregister_device);
|
||||
Loading…
Reference in New Issue