353 lines
9.7 KiB
C
353 lines
9.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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* Copyright (C) 2014 Marvell International Ltd.
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*
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* Authors:
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* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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*/
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#ifndef __NET_NFC_H
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#define __NET_NFC_H
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#include <linux/nfc.h>
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#include <linux/device.h>
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#include <linux/skbuff.h>
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#define nfc_dbg(dev, fmt, ...) dev_dbg((dev), "NFC: " fmt, ##__VA_ARGS__)
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#define nfc_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__)
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#define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__)
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struct nfc_phy_ops {
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int (*write)(void *dev_id, struct sk_buff *skb);
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int (*enable)(void *dev_id);
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void (*disable)(void *dev_id);
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};
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struct nfc_dev;
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/**
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* data_exchange_cb_t - Definition of nfc_data_exchange callback
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*
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* @context: nfc_data_exchange cb_context parameter
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* @skb: response data
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* @err: If an error has occurred during data exchange, it is the
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* error number. Zero means no error.
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*
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* When a rx or tx package is lost or corrupted or the target gets out
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* of the operating field, err is -EIO.
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*/
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typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
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int err);
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typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err);
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struct nfc_target;
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struct nfc_ops {
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int (*dev_up)(struct nfc_dev *dev);
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int (*dev_down)(struct nfc_dev *dev);
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int (*start_poll)(struct nfc_dev *dev,
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u32 im_protocols, u32 tm_protocols);
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void (*stop_poll)(struct nfc_dev *dev);
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int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
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u8 comm_mode, u8 *gb, size_t gb_len);
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int (*dep_link_down)(struct nfc_dev *dev);
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int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
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u32 protocol);
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void (*deactivate_target)(struct nfc_dev *dev,
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struct nfc_target *target, u8 mode);
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int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
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struct sk_buff *skb, data_exchange_cb_t cb,
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void *cb_context);
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int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
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int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
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int (*fw_download)(struct nfc_dev *dev, const char *firmware_name);
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/* Secure Element API */
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int (*discover_se)(struct nfc_dev *dev);
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int (*enable_se)(struct nfc_dev *dev, u32 se_idx);
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int (*disable_se)(struct nfc_dev *dev, u32 se_idx);
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int (*se_io) (struct nfc_dev *dev, u32 se_idx,
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u8 *apdu, size_t apdu_length,
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se_io_cb_t cb, void *cb_context);
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};
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#define NFC_TARGET_IDX_ANY -1
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#define NFC_MAX_GT_LEN 48
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#define NFC_ATR_RES_GT_OFFSET 15
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#define NFC_ATR_REQ_GT_OFFSET 14
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/**
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* struct nfc_target - NFC target descriptiom
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*
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* @sens_res: 2 bytes describing the target SENS_RES response, if the target
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* is a type A one. The %sens_res most significant byte must be byte 2
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* as described by the NFC Forum digital specification (i.e. the platform
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* configuration one) while %sens_res least significant byte is byte 1.
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*/
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struct nfc_target {
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u32 idx;
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u32 supported_protocols;
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u16 sens_res;
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u8 sel_res;
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u8 nfcid1_len;
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u8 nfcid1[NFC_NFCID1_MAXSIZE];
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u8 nfcid2_len;
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u8 nfcid2[NFC_NFCID2_MAXSIZE];
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u8 sensb_res_len;
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u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
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u8 sensf_res_len;
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u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
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u8 hci_reader_gate;
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u8 logical_idx;
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u8 is_iso15693;
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u8 iso15693_dsfid;
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u8 iso15693_uid[NFC_ISO15693_UID_MAXSIZE];
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};
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/**
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* nfc_se - A structure for NFC accessible secure elements.
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*
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* @idx: The secure element index. User space will enable or
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* disable a secure element by its index.
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* @type: The secure element type. It can be SE_UICC or
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* SE_EMBEDDED.
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* @state: The secure element state, either enabled or disabled.
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*
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*/
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struct nfc_se {
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struct list_head list;
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u32 idx;
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u16 type;
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u16 state;
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};
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/**
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* nfc_evt_transaction - A struct for NFC secure element event transaction.
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*
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* @aid: The application identifier triggering the event
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*
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* @aid_len: The application identifier length [5:16]
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*
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* @params: The application parameters transmitted during the transaction
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*
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* @params_len: The applications parameters length [0:255]
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*
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*/
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#define NFC_MIN_AID_LENGTH 5
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#define NFC_MAX_AID_LENGTH 16
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#define NFC_MAX_PARAMS_LENGTH 255
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#define NFC_EVT_TRANSACTION_AID_TAG 0x81
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#define NFC_EVT_TRANSACTION_PARAMS_TAG 0x82
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struct nfc_evt_transaction {
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u32 aid_len;
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u8 aid[NFC_MAX_AID_LENGTH];
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u8 params_len;
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u8 params[];
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} __packed;
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struct nfc_genl_data {
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u32 poll_req_portid;
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struct mutex genl_data_mutex;
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};
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struct nfc_vendor_cmd {
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__u32 vendor_id;
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__u32 subcmd;
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int (*doit)(struct nfc_dev *dev, void *data, size_t data_len);
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};
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struct nfc_dev {
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int idx;
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u32 target_next_idx;
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struct nfc_target *targets;
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int n_targets;
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int targets_generation;
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struct device dev;
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bool dev_up;
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bool fw_download_in_progress;
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u8 rf_mode;
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bool polling;
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struct nfc_target *active_target;
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bool dep_link_up;
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struct nfc_genl_data genl_data;
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u32 supported_protocols;
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struct list_head secure_elements;
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int tx_headroom;
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int tx_tailroom;
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struct timer_list check_pres_timer;
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struct work_struct check_pres_work;
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bool shutting_down;
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struct rfkill *rfkill;
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const struct nfc_vendor_cmd *vendor_cmds;
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int n_vendor_cmds;
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const struct nfc_ops *ops;
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struct genl_info *cur_cmd_info;
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};
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#define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
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extern struct class nfc_class;
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struct nfc_dev *nfc_allocate_device(const struct nfc_ops *ops,
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u32 supported_protocols,
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int tx_headroom,
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int tx_tailroom);
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/**
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* nfc_free_device - free nfc device
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*
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* @dev: The nfc device to free
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*/
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static inline void nfc_free_device(struct nfc_dev *dev)
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{
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put_device(&dev->dev);
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}
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int nfc_register_device(struct nfc_dev *dev);
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void nfc_unregister_device(struct nfc_dev *dev);
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/**
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* nfc_set_parent_dev - set the parent device
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*
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* @nfc_dev: The nfc device whose parent is being set
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* @dev: The parent device
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*/
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static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
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struct device *dev)
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{
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nfc_dev->dev.parent = dev;
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}
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/**
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* nfc_set_drvdata - set driver specifc data
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*
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* @dev: The nfc device
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* @data: Pointer to driver specifc data
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*/
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static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
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{
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dev_set_drvdata(&dev->dev, data);
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}
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/**
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* nfc_get_drvdata - get driver specifc data
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*
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* @dev: The nfc device
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*/
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static inline void *nfc_get_drvdata(const struct nfc_dev *dev)
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{
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return dev_get_drvdata(&dev->dev);
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}
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/**
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* nfc_device_name - get the nfc device name
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*
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* @dev: The nfc device whose name to return
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*/
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static inline const char *nfc_device_name(const struct nfc_dev *dev)
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{
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return dev_name(&dev->dev);
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}
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struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
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unsigned int flags, unsigned int size,
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unsigned int *err);
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struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
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int nfc_set_remote_general_bytes(struct nfc_dev *dev,
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const u8 *gt, u8 gt_len);
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u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
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int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
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u32 result);
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int nfc_targets_found(struct nfc_dev *dev,
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struct nfc_target *targets, int ntargets);
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int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
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int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
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u8 comm_mode, u8 rf_mode);
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int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
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const u8 *gb, size_t gb_len);
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int nfc_tm_deactivated(struct nfc_dev *dev);
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int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
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void nfc_driver_failure(struct nfc_dev *dev, int err);
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int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
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struct nfc_evt_transaction *evt_transaction);
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int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx);
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int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);
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int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);
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struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);
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void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
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u8 payload_type, u8 direction);
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static inline int nfc_set_vendor_cmds(struct nfc_dev *dev,
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const struct nfc_vendor_cmd *cmds,
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int n_cmds)
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{
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if (dev->vendor_cmds || dev->n_vendor_cmds)
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return -EINVAL;
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dev->vendor_cmds = cmds;
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dev->n_vendor_cmds = n_cmds;
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return 0;
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}
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struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
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enum nfc_attrs attr,
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u32 oui, u32 subcmd,
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int approxlen);
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int nfc_vendor_cmd_reply(struct sk_buff *skb);
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/**
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* nfc_vendor_cmd_alloc_reply_skb - allocate vendor command reply
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* @dev: nfc device
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* @oui: vendor oui
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* @approxlen: an upper bound of the length of the data that will
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* be put into the skb
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*
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* This function allocates and pre-fills an skb for a reply to
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* a vendor command. Since it is intended for a reply, calling
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* it outside of a vendor command's doit() operation is invalid.
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*
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* The returned skb is pre-filled with some identifying data in
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* a way that any data that is put into the skb (with skb_put(),
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* nla_put() or similar) will end up being within the
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* %NFC_ATTR_VENDOR_DATA attribute, so all that needs to be done
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* with the skb is adding data for the corresponding userspace tool
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* which can then read that data out of the vendor data attribute.
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* You must not modify the skb in any other way.
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*
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* When done, call nfc_vendor_cmd_reply() with the skb and return
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* its error code as the result of the doit() operation.
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*
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* Return: An allocated and pre-filled skb. %NULL if any errors happen.
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*/
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static inline struct sk_buff *
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nfc_vendor_cmd_alloc_reply_skb(struct nfc_dev *dev,
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u32 oui, u32 subcmd, int approxlen)
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{
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return __nfc_alloc_vendor_cmd_reply_skb(dev,
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NFC_ATTR_VENDOR_DATA,
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oui,
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subcmd, approxlen);
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}
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#endif /* __NET_NFC_H */
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