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Filename : digital.h
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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 */