forked from Minki/linux
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 @@
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* NFC Controller (NFCC) and a Device Host (DH).
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2013 Intel Corporation. All rights reserved.
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*
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* Written by Ilan Elias <ilane@ti.com>
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*
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@ -202,4 +203,52 @@ void nci_req_complete(struct nci_dev *ndev, int result);
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/* ----- NCI status code ----- */
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int nci_to_errno(__u8 code);
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/* ----- NCI over SPI acknowledge modes ----- */
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#define NCI_SPI_CRC_DISABLED 0x00
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#define NCI_SPI_CRC_ENABLED 0x01
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/* ----- NCI SPI structures ----- */
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struct nci_spi_dev;
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struct nci_spi_ops {
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int (*open)(struct nci_spi_dev *ndev);
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int (*close)(struct nci_spi_dev *ndev);
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void (*assert_int)(struct nci_spi_dev *ndev);
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void (*deassert_int)(struct nci_spi_dev *ndev);
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};
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struct nci_spi_dev {
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struct nci_dev *nci_dev;
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struct spi_device *spi;
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struct nci_spi_ops *ops;
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unsigned int xfer_udelay; /* microseconds delay between
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transactions */
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u8 acknowledge_mode;
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void *driver_data;
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};
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/* ----- NCI SPI Devices ----- */
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struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi,
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struct nci_spi_ops *ops,
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u32 supported_protocols,
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u32 supported_se,
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u8 acknowledge_mode,
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unsigned int delay);
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void nci_spi_free_device(struct nci_spi_dev *ndev);
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int nci_spi_register_device(struct nci_spi_dev *ndev);
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void nci_spi_unregister_device(struct nci_spi_dev *ndev);
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static inline void nci_spi_set_drvdata(struct nci_spi_dev *ndev,
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void *data)
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{
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ndev->driver_data = data;
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}
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static inline void *nci_spi_get_drvdata(struct nci_spi_dev *ndev)
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{
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return ndev->driver_data;
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}
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#endif /* __NCI_CORE_H */
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@ -8,3 +8,13 @@ config NFC_NCI
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Say Y here to compile NCI support into the kernel or say M to
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compile it as module (nci).
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config NFC_NCI_SPI
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depends on NFC_NCI && SPI
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bool "NCI over SPI protocol support"
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default n
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help
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NCI (NFC Controller Interface) is a communication protocol between
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an NFC Controller (NFCC) and a Device Host (DH).
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Say yes if you use an NCI driver that requires SPI link layer.
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@ -4,4 +4,6 @@
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obj-$(CONFIG_NFC_NCI) += nci.o
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nci-objs := core.o data.o lib.o ntf.o rsp.o
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nci-objs := core.o data.o lib.o ntf.o rsp.o
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nci-$(CONFIG_NFC_NCI_SPI) += spi.o
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136
net/nfc/nci/spi.c
Normal file
136
net/nfc/nci/spi.c
Normal file
@ -0,0 +1,136 @@
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/*
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* Copyright (C) 2013 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#define pr_fmt(fmt) "nci_spi: %s: " fmt, __func__
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#include <linux/export.h>
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#include <linux/spi/spi.h>
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#include <linux/nfc.h>
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#include <net/nfc/nci_core.h>
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#define NCI_SPI_HDR_LEN 4
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#define NCI_SPI_CRC_LEN 2
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static int nci_spi_open(struct nci_dev *nci_dev)
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{
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struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
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return ndev->ops->open(ndev);
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}
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static int nci_spi_close(struct nci_dev *nci_dev)
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{
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struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
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return ndev->ops->close(ndev);
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}
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static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb)
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{
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return 0;
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}
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static struct nci_ops nci_spi_ops = {
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.open = nci_spi_open,
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.close = nci_spi_close,
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.send = nci_spi_send,
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};
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/* ---- Interface to NCI SPI drivers ---- */
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/**
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* nci_spi_allocate_device - allocate a new nci spi device
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*
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* @spi: SPI device
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* @ops: device operations
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* @supported_protocols: NFC protocols supported by the device
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* @supported_se: NFC Secure Elements supported by the device
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* @acknowledge_mode: Acknowledge mode used by the device
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* @delay: delay between transactions in us
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*/
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struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi,
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struct nci_spi_ops *ops,
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u32 supported_protocols,
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u32 supported_se,
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u8 acknowledge_mode,
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unsigned int delay)
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{
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struct nci_spi_dev *ndev;
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int tailroom = 0;
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if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int)
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return NULL;
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if (!supported_protocols)
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return NULL;
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ndev = devm_kzalloc(&spi->dev, sizeof(struct nci_dev), GFP_KERNEL);
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if (!ndev)
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return NULL;
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ndev->ops = ops;
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ndev->acknowledge_mode = acknowledge_mode;
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ndev->xfer_udelay = delay;
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if (acknowledge_mode == NCI_SPI_CRC_ENABLED)
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tailroom += NCI_SPI_CRC_LEN;
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ndev->nci_dev = nci_allocate_device(&nci_spi_ops, supported_protocols,
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supported_se, NCI_SPI_HDR_LEN,
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tailroom);
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if (!ndev->nci_dev)
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return NULL;
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nci_set_drvdata(ndev->nci_dev, ndev);
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return ndev;
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}
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EXPORT_SYMBOL_GPL(nci_spi_allocate_device);
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/**
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* nci_spi_free_device - deallocate nci spi device
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*
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* @ndev: The nci spi device to deallocate
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*/
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void nci_spi_free_device(struct nci_spi_dev *ndev)
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{
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nci_free_device(ndev->nci_dev);
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}
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EXPORT_SYMBOL_GPL(nci_spi_free_device);
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/**
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* nci_spi_register_device - register a nci spi device in the nfc subsystem
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*
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* @pdev: The nci spi device to register
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*/
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int nci_spi_register_device(struct nci_spi_dev *ndev)
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{
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return nci_register_device(ndev->nci_dev);
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}
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EXPORT_SYMBOL_GPL(nci_spi_register_device);
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/**
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* nci_spi_unregister_device - unregister a nci spi device in the nfc subsystem
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*
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* @dev: The nci spi device to unregister
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*/
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void nci_spi_unregister_device(struct nci_spi_dev *ndev)
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{
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nci_unregister_device(ndev->nci_dev);
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}
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EXPORT_SYMBOL_GPL(nci_spi_unregister_device);
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