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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* NFC Digital Protocol stack
* Copyright (c) 2013, Intel Corporation.
*/
#ifndef __NFC_DIGITAL_H
#define __NFC_DIGITAL_H
#include <linux/skbuff.h>
#include <net/nfc/nfc.h>
/**
* Configuration types for in_configure_hw and tg_configure_hw.
*/
enum {
NFC_DIGITAL_CONFIG_RF_TECH = 0,
NFC_DIGITAL_CONFIG_FRAMING,
};
/**
* RF technology values passed as param argument to in_configure_hw and
* tg_configure_hw for NFC_DIGITAL_CONFIG_RF_TECH configuration type.
*/
enum {
NFC_DIGITAL_RF_TECH_106A = 0,
NFC_DIGITAL_RF_TECH_212F,
NFC_DIGITAL_RF_TECH_424F,
NFC_DIGITAL_RF_TECH_ISO15693,
NFC_DIGITAL_RF_TECH_106B,
NFC_DIGITAL_RF_TECH_LAST,
};
/**
* Framing configuration passed as param argument to in_configure_hw and
* tg_configure_hw for NFC_DIGITAL_CONFIG_FRAMING configuration type.
*/
enum {
NFC_DIGITAL_FRAMING_NFCA_SHORT = 0,
NFC_DIGITAL_FRAMING_NFCA_STANDARD,
NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A,
NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE,
NFC_DIGITAL_FRAMING_NFCA_T1T,
NFC_DIGITAL_FRAMING_NFCA_T2T,
NFC_DIGITAL_FRAMING_NFCA_T4T,
NFC_DIGITAL_FRAMING_NFCA_NFC_DEP,
NFC_DIGITAL_FRAMING_NFCF,
NFC_DIGITAL_FRAMING_NFCF_T3T,
NFC_DIGITAL_FRAMING_NFCF_NFC_DEP,
NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED,
NFC_DIGITAL_FRAMING_ISO15693_INVENTORY,
NFC_DIGITAL_FRAMING_ISO15693_T5T,
NFC_DIGITAL_FRAMING_NFCB,
NFC_DIGITAL_FRAMING_NFCB_T4T,
NFC_DIGITAL_FRAMING_LAST,
};
#define DIGITAL_MDAA_NFCID1_SIZE 3
struct digital_tg_mdaa_params {
u16 sens_res;
u8 nfcid1[DIGITAL_MDAA_NFCID1_SIZE];
u8 sel_res;
u8 nfcid2[NFC_NFCID2_MAXSIZE];
u16 sc;
};
struct nfc_digital_dev;
/**
* nfc_digital_cmd_complete_t - Definition of command result callback
*
* @ddev: nfc_digital_device ref
* @arg: user data
* @resp: response data
*
* resp pointer can be an error code and will be checked with IS_ERR() macro.
* The callback is responsible for freeing resp sk_buff.
*/
typedef void (*nfc_digital_cmd_complete_t)(struct nfc_digital_dev *ddev,
void *arg, struct sk_buff *resp);
/**
* Device side NFC Digital operations
*
* Initiator mode:
* @in_configure_hw: Hardware configuration for RF technology and communication
* framing in initiator mode. This is a synchronous function.
* @in_send_cmd: Initiator mode data exchange using RF technology and framing
* previously set with in_configure_hw. The peer response is returned
* through callback cb. If an io error occurs or the peer didn't reply
* within the specified timeout (ms), the error code is passed back through
* the resp pointer. This is an asynchronous function.
*
* Target mode: Only NFC-DEP protocol is supported in target mode.
* @tg_configure_hw: Hardware configuration for RF technology and communication
* framing in target mode. This is a synchronous function.
* @tg_send_cmd: Target mode data exchange using RF technology and framing
* previously set with tg_configure_hw. The peer next command is returned
* through callback cb. If an io error occurs or the peer didn't reply
* within the specified timeout (ms), the error code is passed back through
* the resp pointer. This is an asynchronous function.
* @tg_listen: Put the device in listen mode waiting for data from the peer
* device. This is an asynchronous function.
* @tg_listen_mdaa: If supported, put the device in automatic listen mode with
* mode detection and automatic anti-collision. In this mode, the device
* automatically detects the RF technology and executes the anti-collision
* detection using the command responses specified in mdaa_params. The
* mdaa_params structure contains SENS_RES, NFCID1, and SEL_RES for 106A RF
* tech. NFCID2 and system code (sc) for 212F and 424F. The driver returns
* the NFC-DEP ATR_REQ command through cb. The digital stack deducts the RF
* tech by analyzing the SoD of the frame containing the ATR_REQ command.
* This is an asynchronous function.
* @tg_listen_md: If supported, put the device in automatic listen mode with
* mode detection but without automatic anti-collision. In this mode, the
* device automatically detects the RF technology. What the actual
* RF technology is can be retrieved by calling @tg_get_rf_tech.
* The digital stack will then perform the appropriate anti-collision
* sequence. This is an asynchronous function.
* @tg_get_rf_tech: Required when @tg_listen_md is supported, unused otherwise.
* Return the RF Technology that was detected by the @tg_listen_md call.
* This is a synchronous function.
*
* @switch_rf: Turns device radio on or off. The stack does not call explicitly
* switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
* the device radio on.
* @abort_cmd: Discard the last sent command.
*
* Notes: Asynchronous functions have a timeout parameter. It is the driver
* responsibility to call the digital stack back through the
* nfc_digital_cmd_complete_t callback when no RF respsonse has been
* received within the specified time (in milliseconds). In that case the
* driver must set the resp sk_buff to ERR_PTR(-ETIMEDOUT).
* Since the digital stack serializes commands to be sent, it's mandatory
* for the driver to handle the timeout correctly. Otherwise the stack
* would not be able to send new commands, waiting for the reply of the
* current one.
*/
struct nfc_digital_ops {
int (*in_configure_hw)(struct nfc_digital_dev *ddev, int type,
int param);
int (*in_send_cmd)(struct nfc_digital_dev *ddev, struct sk_buff *skb,
u16 timeout, nfc_digital_cmd_complete_t cb,
void *arg);
int (*tg_configure_hw)(struct nfc_digital_dev *ddev, int type,
int param);
int (*tg_send_cmd)(struct nfc_digital_dev *ddev, struct sk_buff *skb,
u16 timeout, nfc_digital_cmd_complete_t cb,
void *arg);
int (*tg_listen)(struct nfc_digital_dev *ddev, u16 timeout,
nfc_digital_cmd_complete_t cb, void *arg);
int (*tg_listen_mdaa)(struct nfc_digital_dev *ddev,
struct digital_tg_mdaa_params *mdaa_params,
u16 timeout, nfc_digital_cmd_complete_t cb,
void *arg);
int (*tg_listen_md)(struct nfc_digital_dev *ddev, u16 timeout,
nfc_digital_cmd_complete_t cb, void *arg);
int (*tg_get_rf_tech)(struct nfc_digital_dev *ddev, u8 *rf_tech);
int (*switch_rf)(struct nfc_digital_dev *ddev, bool on);
void (*abort_cmd)(struct nfc_digital_dev *ddev);
};
#define NFC_DIGITAL_POLL_MODE_COUNT_MAX 6 /* 106A, 212F, and 424F in & tg */
typedef int (*digital_poll_t)(struct nfc_digital_dev *ddev, u8 rf_tech);
struct digital_poll_tech {
u8 rf_tech;
digital_poll_t poll_func;
};
/**
* Driver capabilities - bit mask made of the following values
*
* @NFC_DIGITAL_DRV_CAPS_IN_CRC: The driver handles CRC calculation in initiator
* mode.
* @NFC_DIGITAL_DRV_CAPS_TG_CRC: The driver handles CRC calculation in target
* mode.
*/
#define NFC_DIGITAL_DRV_CAPS_IN_CRC 0x0001
#define NFC_DIGITAL_DRV_CAPS_TG_CRC 0x0002
struct nfc_digital_dev {
struct nfc_dev *nfc_dev;
const struct nfc_digital_ops *ops;
u32 protocols;
int tx_headroom;
int tx_tailroom;
u32 driver_capabilities;
void *driver_data;
struct digital_poll_tech poll_techs[NFC_DIGITAL_POLL_MODE_COUNT_MAX];
u8 poll_tech_count;
u8 poll_tech_index;
struct mutex poll_lock;
struct work_struct cmd_work;
struct work_struct cmd_complete_work;
struct list_head cmd_queue;
struct mutex cmd_lock;
struct delayed_work poll_work;
u8 curr_protocol;
u8 curr_rf_tech;
u8 curr_nfc_dep_pni;
u8 did;
u16 dep_rwt;
u8 local_payload_max;
u8 remote_payload_max;
struct sk_buff *chaining_skb;
struct digital_data_exch *data_exch;
int atn_count;
int nack_count;
struct sk_buff *saved_skb;
u16 target_fsc;
int (*skb_check_crc)(struct sk_buff *skb);
void (*skb_add_crc)(struct sk_buff *skb);
};
struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops,
__u32 supported_protocols,
__u32 driver_capabilities,
int tx_headroom,
int tx_tailroom);
void nfc_digital_free_device(struct nfc_digital_dev *ndev);
int nfc_digital_register_device(struct nfc_digital_dev *ndev);
void nfc_digital_unregister_device(struct nfc_digital_dev *ndev);
static inline void nfc_digital_set_parent_dev(struct nfc_digital_dev *ndev,
struct device *dev)
{
nfc_set_parent_dev(ndev->nfc_dev, dev);
}
static inline void nfc_digital_set_drvdata(struct nfc_digital_dev *dev,
void *data)
{
dev->driver_data = data;
}
static inline void *nfc_digital_get_drvdata(struct nfc_digital_dev *dev)
{
return dev->driver_data;
}
#endif /* __NFC_DIGITAL_H */