/* 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 { … }; /** * RF technology values passed as param argument to in_configure_hw and * tg_configure_hw for NFC_DIGITAL_CONFIG_RF_TECH configuration type. */ enum { … }; /** * Framing configuration passed as param argument to in_configure_hw and * tg_configure_hw for NFC_DIGITAL_CONFIG_FRAMING configuration type. */ enum { … }; #define DIGITAL_MDAA_NFCID1_SIZE … struct digital_tg_mdaa_params { … }; 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. */ nfc_digital_cmd_complete_t; /** * 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 { … }; #define NFC_DIGITAL_POLL_MODE_COUNT_MAX … digital_poll_t; struct digital_poll_tech { … }; /** * 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 … #define NFC_DIGITAL_DRV_CAPS_TG_CRC … struct nfc_digital_dev { … }; 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) { … } static inline void nfc_digital_set_drvdata(struct nfc_digital_dev *dev, void *data) { … } static inline void *nfc_digital_get_drvdata(struct nfc_digital_dev *dev) { … } #endif /* __NFC_DIGITAL_H */
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