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linux/include/net/nfc/nfc.h
Samuel Ortiz 8115dd5905 NFC: Introduce vendor commands structures 
Together with inline routines to associate a vendor commands
array with an NFC device.

Vendor commands allow vendors to implement their very specific
operations from driver code instead of adding new stack ops
for non NFC generic commands.
Vendors need to select their own unique IDs and use that as a
namespace for defining sub commands.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-09 01:20:19 +02:00

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/*
* Copyright (C) 2011 Instituto Nokia de Tecnologia
* Copyright (C) 2014 Marvell International Ltd.
*
* Authors:
* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __NET_NFC_H
#define __NET_NFC_H
#include <linux/nfc.h>
#include <linux/device.h>
#include <linux/skbuff.h>
#define nfc_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__)
#define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__)
struct nfc_phy_ops {
int (*write)(void *dev_id, struct sk_buff *skb);
int (*enable)(void *dev_id);
void (*disable)(void *dev_id);
};
struct nfc_dev;
/**
* data_exchange_cb_t - Definition of nfc_data_exchange callback
*
* @context: nfc_data_exchange cb_context parameter
* @skb: response data
* @err: If an error has occurred during data exchange, it is the
* error number. Zero means no error.
*
* When a rx or tx package is lost or corrupted or the target gets out
* of the operating field, err is -EIO.
*/
typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
int err);
typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err);
struct nfc_target;
struct nfc_ops {
int (*dev_up)(struct nfc_dev *dev);
int (*dev_down)(struct nfc_dev *dev);
int (*start_poll)(struct nfc_dev *dev,
u32 im_protocols, u32 tm_protocols);
void (*stop_poll)(struct nfc_dev *dev);
int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
u8 comm_mode, u8 *gb, size_t gb_len);
int (*dep_link_down)(struct nfc_dev *dev);
int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
u32 protocol);
void (*deactivate_target)(struct nfc_dev *dev,
struct nfc_target *target);
int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
struct sk_buff *skb, data_exchange_cb_t cb,
void *cb_context);
int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
int (*fw_download)(struct nfc_dev *dev, const char *firmware_name);
/* Secure Element API */
int (*discover_se)(struct nfc_dev *dev);
int (*enable_se)(struct nfc_dev *dev, u32 se_idx);
int (*disable_se)(struct nfc_dev *dev, u32 se_idx);
int (*se_io) (struct nfc_dev *dev, u32 se_idx,
u8 *apdu, size_t apdu_length,
se_io_cb_t cb, void *cb_context);
};
#define NFC_TARGET_IDX_ANY -1
#define NFC_MAX_GT_LEN 48
#define NFC_ATR_RES_GT_OFFSET 15
#define NFC_ATR_REQ_GT_OFFSET 14
/**
* struct nfc_target - NFC target descriptiom
*
* @sens_res: 2 bytes describing the target SENS_RES response, if the target
* is a type A one. The %sens_res most significant byte must be byte 2
* as described by the NFC Forum digital specification (i.e. the platform
* configuration one) while %sens_res least significant byte is byte 1.
*/
struct nfc_target {
u32 idx;
u32 supported_protocols;
u16 sens_res;
u8 sel_res;
u8 nfcid1_len;
u8 nfcid1[NFC_NFCID1_MAXSIZE];
u8 nfcid2_len;
u8 nfcid2[NFC_NFCID2_MAXSIZE];
u8 sensb_res_len;
u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
u8 sensf_res_len;
u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
u8 hci_reader_gate;
u8 logical_idx;
u8 is_iso15693;
u8 iso15693_dsfid;
u8 iso15693_uid[NFC_ISO15693_UID_MAXSIZE];
};
/**
* nfc_se - A structure for NFC accessible secure elements.
*
* @idx: The secure element index. User space will enable or
* disable a secure element by its index.
* @type: The secure element type. It can be SE_UICC or
* SE_EMBEDDED.
* @state: The secure element state, either enabled or disabled.
*
*/
struct nfc_se {
struct list_head list;
u32 idx;
u16 type;
u16 state;
};
/**
* nfc_evt_transaction - A struct for NFC secure element event transaction.
*
* @aid: The application identifier triggering the event
*
* @aid_len: The application identifier length [5:16]
*
* @params: The application parameters transmitted during the transaction
*
* @params_len: The applications parameters length [0:255]
*
*/
#define NFC_MIN_AID_LENGTH 5
#define NFC_MAX_AID_LENGTH 16
#define NFC_MAX_PARAMS_LENGTH 255
#define NFC_EVT_TRANSACTION_AID_TAG 0x81
#define NFC_EVT_TRANSACTION_PARAMS_TAG 0x82
struct nfc_evt_transaction {
u32 aid_len;
u8 aid[NFC_MAX_AID_LENGTH];
u8 params_len;
u8 params[0];
} __packed;
struct nfc_genl_data {
u32 poll_req_portid;
struct mutex genl_data_mutex;
};
struct nfc_vendor_cmd {
__u32 vendor_id;
__u32 subcmd;
int (*doit)(struct nfc_dev *dev, void *data, size_t data_len);
};
struct nfc_dev {
int idx;
u32 target_next_idx;
struct nfc_target *targets;
int n_targets;
int targets_generation;
struct device dev;
bool dev_up;
bool fw_download_in_progress;
u8 rf_mode;
bool polling;
struct nfc_target *active_target;
bool dep_link_up;
struct nfc_genl_data genl_data;
u32 supported_protocols;
struct list_head secure_elements;
int tx_headroom;
int tx_tailroom;
struct timer_list check_pres_timer;
struct work_struct check_pres_work;
bool shutting_down;
struct rfkill *rfkill;
struct nfc_vendor_cmd *vendor_cmds;
int n_vendor_cmds;
struct nfc_ops *ops;
};
#define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
extern struct class nfc_class;
struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
u32 supported_protocols,
int tx_headroom,
int tx_tailroom);
/**
* nfc_free_device - free nfc device
*
* @dev: The nfc device to free
*/
static inline void nfc_free_device(struct nfc_dev *dev)
{
put_device(&dev->dev);
}
int nfc_register_device(struct nfc_dev *dev);
void nfc_unregister_device(struct nfc_dev *dev);
/**
* nfc_set_parent_dev - set the parent device
*
* @nfc_dev: The nfc device whose parent is being set
* @dev: The parent device
*/
static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
struct device *dev)
{
nfc_dev->dev.parent = dev;
}
/**
* nfc_set_drvdata - set driver specifc data
*
* @dev: The nfc device
* @data: Pointer to driver specifc data
*/
static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
{
dev_set_drvdata(&dev->dev, data);
}
/**
* nfc_get_drvdata - get driver specifc data
*
* @dev: The nfc device
*/
static inline void *nfc_get_drvdata(struct nfc_dev *dev)
{
return dev_get_drvdata(&dev->dev);
}
/**
* nfc_device_name - get the nfc device name
*
* @dev: The nfc device whose name to return
*/
static inline const char *nfc_device_name(struct nfc_dev *dev)
{
return dev_name(&dev->dev);
}
struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
unsigned int flags, unsigned int size,
unsigned int *err);
struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
int nfc_set_remote_general_bytes(struct nfc_dev *dev,
u8 *gt, u8 gt_len);
u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
u32 result);
int nfc_targets_found(struct nfc_dev *dev,
struct nfc_target *targets, int ntargets);
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
u8 comm_mode, u8 rf_mode);
int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
u8 *gb, size_t gb_len);
int nfc_tm_deactivated(struct nfc_dev *dev);
int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
void nfc_driver_failure(struct nfc_dev *dev, int err);
int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
struct nfc_evt_transaction *evt_transaction);
int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);
int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);
struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);
void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
u8 payload_type, u8 direction);
static inline int nfc_set_vendor_cmds(struct nfc_dev *dev,
struct nfc_vendor_cmd *cmds,
int n_cmds)
{
if (dev->vendor_cmds || dev->n_vendor_cmds)
return -EINVAL;
dev->vendor_cmds = cmds;
dev->n_vendor_cmds = n_cmds;
return 0;
}
#endif /* __NET_NFC_H */
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