forked from Minki/linux
ee9596d467
Before any operation, driver interruption is de-asserted to prevent race condition between TX and RX. The NCI over SPI header is added in front of NCI packet. If acknowledged mode is set, CRC-16-CCITT is added to the packet. Then the packet is forwarded to SPI module to be sent. A delay after the transaction is added. This delay is determined by the driver during nci_spi_allocate_device() call and can be 0. After data has been sent, driver interruption is re-asserted. If acknowledged mode is set, nci_spi_send will block until acknowledgment is received. Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
258 lines
6.5 KiB
C
258 lines
6.5 KiB
C
/*
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* The NFC Controller Interface is the communication protocol between an
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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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* Acknowledgements:
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* This file is based on hci_core.h, which was written
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* by Maxim Krasnyansky.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __NCI_CORE_H
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#define __NCI_CORE_H
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#include <linux/interrupt.h>
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#include <linux/skbuff.h>
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#include <net/nfc/nfc.h>
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#include <net/nfc/nci.h>
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/* NCI device flags */
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enum nci_flag {
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NCI_INIT,
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NCI_UP,
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NCI_DATA_EXCHANGE,
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NCI_DATA_EXCHANGE_TO,
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};
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/* NCI device states */
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enum nci_state {
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NCI_IDLE,
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NCI_DISCOVERY,
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NCI_W4_ALL_DISCOVERIES,
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NCI_W4_HOST_SELECT,
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NCI_POLL_ACTIVE,
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};
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/* NCI timeouts */
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#define NCI_RESET_TIMEOUT 5000
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#define NCI_INIT_TIMEOUT 5000
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#define NCI_SET_CONFIG_TIMEOUT 5000
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#define NCI_RF_DISC_TIMEOUT 5000
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#define NCI_RF_DISC_SELECT_TIMEOUT 5000
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#define NCI_RF_DEACTIVATE_TIMEOUT 30000
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#define NCI_CMD_TIMEOUT 5000
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#define NCI_DATA_TIMEOUT 700
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struct nci_dev;
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struct nci_ops {
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int (*open)(struct nci_dev *ndev);
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int (*close)(struct nci_dev *ndev);
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int (*send)(struct nci_dev *ndev, struct sk_buff *skb);
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};
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#define NCI_MAX_SUPPORTED_RF_INTERFACES 4
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#define NCI_MAX_DISCOVERED_TARGETS 10
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/* NCI Core structures */
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struct nci_dev {
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struct nfc_dev *nfc_dev;
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struct nci_ops *ops;
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int tx_headroom;
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int tx_tailroom;
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atomic_t state;
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unsigned long flags;
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atomic_t cmd_cnt;
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atomic_t credits_cnt;
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struct timer_list cmd_timer;
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struct timer_list data_timer;
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struct workqueue_struct *cmd_wq;
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struct work_struct cmd_work;
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struct workqueue_struct *rx_wq;
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struct work_struct rx_work;
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struct workqueue_struct *tx_wq;
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struct work_struct tx_work;
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struct sk_buff_head cmd_q;
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struct sk_buff_head rx_q;
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struct sk_buff_head tx_q;
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struct mutex req_lock;
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struct completion req_completion;
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__u32 req_status;
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__u32 req_result;
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void *driver_data;
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__u32 poll_prots;
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__u32 target_active_prot;
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struct nfc_target targets[NCI_MAX_DISCOVERED_TARGETS];
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int n_targets;
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/* received during NCI_OP_CORE_RESET_RSP */
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__u8 nci_ver;
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/* received during NCI_OP_CORE_INIT_RSP */
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__u32 nfcc_features;
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__u8 num_supported_rf_interfaces;
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__u8 supported_rf_interfaces
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[NCI_MAX_SUPPORTED_RF_INTERFACES];
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__u8 max_logical_connections;
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__u16 max_routing_table_size;
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__u8 max_ctrl_pkt_payload_len;
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__u16 max_size_for_large_params;
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__u8 manufact_id;
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__u32 manufact_specific_info;
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/* received during NCI_OP_RF_INTF_ACTIVATED_NTF */
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__u8 max_data_pkt_payload_size;
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__u8 initial_num_credits;
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/* stored during nci_data_exchange */
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data_exchange_cb_t data_exchange_cb;
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void *data_exchange_cb_context;
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struct sk_buff *rx_data_reassembly;
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/* stored during intf_activated_ntf */
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__u8 remote_gb[NFC_MAX_GT_LEN];
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__u8 remote_gb_len;
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};
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/* ----- NCI Devices ----- */
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struct nci_dev *nci_allocate_device(struct nci_ops *ops,
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__u32 supported_protocols,
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__u32 supported_se,
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int tx_headroom,
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int tx_tailroom);
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void nci_free_device(struct nci_dev *ndev);
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int nci_register_device(struct nci_dev *ndev);
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void nci_unregister_device(struct nci_dev *ndev);
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int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb);
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static inline struct sk_buff *nci_skb_alloc(struct nci_dev *ndev,
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unsigned int len,
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gfp_t how)
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{
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struct sk_buff *skb;
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skb = alloc_skb(len + ndev->tx_headroom + ndev->tx_tailroom, how);
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if (skb)
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skb_reserve(skb, ndev->tx_headroom);
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return skb;
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}
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static inline void nci_set_parent_dev(struct nci_dev *ndev, struct device *dev)
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{
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nfc_set_parent_dev(ndev->nfc_dev, dev);
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}
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static inline void nci_set_drvdata(struct nci_dev *ndev, 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_get_drvdata(struct nci_dev *ndev)
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{
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return ndev->driver_data;
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}
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void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb);
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void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb);
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void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb);
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int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload);
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int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb);
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void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
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int err);
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void nci_clear_target_list(struct nci_dev *ndev);
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/* ----- NCI requests ----- */
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#define NCI_REQ_DONE 0
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#define NCI_REQ_PEND 1
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#define NCI_REQ_CANCELED 2
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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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struct completion req_completion;
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u8 req_result;
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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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