275 lines
8.8 KiB
C
275 lines
8.8 KiB
C
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/*
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* NFC Digital Protocol stack
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#ifndef __NFC_DIGITAL_H
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#define __NFC_DIGITAL_H
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#include <linux/skbuff.h>
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#include <net/nfc/nfc.h>
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/**
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* Configuration types for in_configure_hw and tg_configure_hw.
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*/
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enum {
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NFC_DIGITAL_CONFIG_RF_TECH = 0,
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NFC_DIGITAL_CONFIG_FRAMING,
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};
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/**
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* RF technology values passed as param argument to in_configure_hw and
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* tg_configure_hw for NFC_DIGITAL_CONFIG_RF_TECH configuration type.
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*/
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enum {
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NFC_DIGITAL_RF_TECH_106A = 0,
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NFC_DIGITAL_RF_TECH_212F,
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NFC_DIGITAL_RF_TECH_424F,
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NFC_DIGITAL_RF_TECH_ISO15693,
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NFC_DIGITAL_RF_TECH_106B,
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NFC_DIGITAL_RF_TECH_LAST,
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};
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/**
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* Framing configuration passed as param argument to in_configure_hw and
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* tg_configure_hw for NFC_DIGITAL_CONFIG_FRAMING configuration type.
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*/
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enum {
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NFC_DIGITAL_FRAMING_NFCA_SHORT = 0,
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NFC_DIGITAL_FRAMING_NFCA_STANDARD,
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NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A,
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NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE,
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NFC_DIGITAL_FRAMING_NFCA_T1T,
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NFC_DIGITAL_FRAMING_NFCA_T2T,
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NFC_DIGITAL_FRAMING_NFCA_T4T,
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NFC_DIGITAL_FRAMING_NFCA_NFC_DEP,
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NFC_DIGITAL_FRAMING_NFCF,
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NFC_DIGITAL_FRAMING_NFCF_T3T,
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NFC_DIGITAL_FRAMING_NFCF_NFC_DEP,
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NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED,
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NFC_DIGITAL_FRAMING_ISO15693_INVENTORY,
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NFC_DIGITAL_FRAMING_ISO15693_T5T,
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NFC_DIGITAL_FRAMING_NFCB,
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NFC_DIGITAL_FRAMING_NFCB_T4T,
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NFC_DIGITAL_FRAMING_LAST,
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};
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#define DIGITAL_MDAA_NFCID1_SIZE 3
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struct digital_tg_mdaa_params {
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u16 sens_res;
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u8 nfcid1[DIGITAL_MDAA_NFCID1_SIZE];
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u8 sel_res;
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u8 nfcid2[NFC_NFCID2_MAXSIZE];
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u16 sc;
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};
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struct nfc_digital_dev;
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/**
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* nfc_digital_cmd_complete_t - Definition of command result callback
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*
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* @ddev: nfc_digital_device ref
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* @arg: user data
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* @resp: response data
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*
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* resp pointer can be an error code and will be checked with IS_ERR() macro.
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* The callback is responsible for freeing resp sk_buff.
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*/
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typedef void (*nfc_digital_cmd_complete_t)(struct nfc_digital_dev *ddev,
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void *arg, struct sk_buff *resp);
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/**
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* Device side NFC Digital operations
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*
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* Initiator mode:
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* @in_configure_hw: Hardware configuration for RF technology and communication
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* framing in initiator mode. This is a synchronous function.
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* @in_send_cmd: Initiator mode data exchange using RF technology and framing
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* previously set with in_configure_hw. The peer response is returned
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* through callback cb. If an io error occurs or the peer didn't reply
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* within the specified timeout (ms), the error code is passed back through
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* the resp pointer. This is an asynchronous function.
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*
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* Target mode: Only NFC-DEP protocol is supported in target mode.
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* @tg_configure_hw: Hardware configuration for RF technology and communication
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* framing in target mode. This is a synchronous function.
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* @tg_send_cmd: Target mode data exchange using RF technology and framing
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* previously set with tg_configure_hw. The peer next command is returned
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* through callback cb. If an io error occurs or the peer didn't reply
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* within the specified timeout (ms), the error code is passed back through
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* the resp pointer. This is an asynchronous function.
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* @tg_listen: Put the device in listen mode waiting for data from the peer
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* device. This is an asynchronous function.
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* @tg_listen_mdaa: If supported, put the device in automatic listen mode with
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* mode detection and automatic anti-collision. In this mode, the device
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* automatically detects the RF technology and executes the anti-collision
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* detection using the command responses specified in mdaa_params. The
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* mdaa_params structure contains SENS_RES, NFCID1, and SEL_RES for 106A RF
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* tech. NFCID2 and system code (sc) for 212F and 424F. The driver returns
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* the NFC-DEP ATR_REQ command through cb. The digital stack deducts the RF
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* tech by analyzing the SoD of the frame containing the ATR_REQ command.
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* This is an asynchronous function.
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* @tg_listen_md: If supported, put the device in automatic listen mode with
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* mode detection but without automatic anti-collision. In this mode, the
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* device automatically detects the RF technology. What the actual
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* RF technology is can be retrieved by calling @tg_get_rf_tech.
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* The digital stack will then perform the appropriate anti-collision
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* sequence. This is an asynchronous function.
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* @tg_get_rf_tech: Required when @tg_listen_md is supported, unused otherwise.
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* Return the RF Technology that was detected by the @tg_listen_md call.
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* This is a synchronous function.
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*
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* @switch_rf: Turns device radio on or off. The stack does not call explicitly
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* switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
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* the device radio on.
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* @abort_cmd: Discard the last sent command.
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*
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* Notes: Asynchronous functions have a timeout parameter. It is the driver
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* responsibility to call the digital stack back through the
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* nfc_digital_cmd_complete_t callback when no RF respsonse has been
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* received within the specified time (in milliseconds). In that case the
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* driver must set the resp sk_buff to ERR_PTR(-ETIMEDOUT).
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* Since the digital stack serializes commands to be sent, it's mandatory
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* for the driver to handle the timeout correctly. Otherwise the stack
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* would not be able to send new commands, waiting for the reply of the
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* current one.
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*/
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struct nfc_digital_ops {
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int (*in_configure_hw)(struct nfc_digital_dev *ddev, int type,
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int param);
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int (*in_send_cmd)(struct nfc_digital_dev *ddev, struct sk_buff *skb,
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u16 timeout, nfc_digital_cmd_complete_t cb,
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void *arg);
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int (*tg_configure_hw)(struct nfc_digital_dev *ddev, int type,
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int param);
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int (*tg_send_cmd)(struct nfc_digital_dev *ddev, struct sk_buff *skb,
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u16 timeout, nfc_digital_cmd_complete_t cb,
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void *arg);
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int (*tg_listen)(struct nfc_digital_dev *ddev, u16 timeout,
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nfc_digital_cmd_complete_t cb, void *arg);
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int (*tg_listen_mdaa)(struct nfc_digital_dev *ddev,
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struct digital_tg_mdaa_params *mdaa_params,
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u16 timeout, nfc_digital_cmd_complete_t cb,
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void *arg);
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int (*tg_listen_md)(struct nfc_digital_dev *ddev, u16 timeout,
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nfc_digital_cmd_complete_t cb, void *arg);
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int (*tg_get_rf_tech)(struct nfc_digital_dev *ddev, u8 *rf_tech);
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int (*switch_rf)(struct nfc_digital_dev *ddev, bool on);
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void (*abort_cmd)(struct nfc_digital_dev *ddev);
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};
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#define NFC_DIGITAL_POLL_MODE_COUNT_MAX 6 /* 106A, 212F, and 424F in & tg */
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typedef int (*digital_poll_t)(struct nfc_digital_dev *ddev, u8 rf_tech);
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struct digital_poll_tech {
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u8 rf_tech;
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digital_poll_t poll_func;
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};
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/**
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* Driver capabilities - bit mask made of the following values
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*
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* @NFC_DIGITAL_DRV_CAPS_IN_CRC: The driver handles CRC calculation in initiator
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* mode.
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* @NFC_DIGITAL_DRV_CAPS_TG_CRC: The driver handles CRC calculation in target
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* mode.
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*/
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#define NFC_DIGITAL_DRV_CAPS_IN_CRC 0x0001
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#define NFC_DIGITAL_DRV_CAPS_TG_CRC 0x0002
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struct nfc_digital_dev {
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struct nfc_dev *nfc_dev;
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struct nfc_digital_ops *ops;
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u32 protocols;
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int tx_headroom;
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int tx_tailroom;
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u32 driver_capabilities;
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void *driver_data;
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struct digital_poll_tech poll_techs[NFC_DIGITAL_POLL_MODE_COUNT_MAX];
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u8 poll_tech_count;
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u8 poll_tech_index;
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struct mutex poll_lock;
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struct work_struct cmd_work;
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struct work_struct cmd_complete_work;
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struct list_head cmd_queue;
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struct mutex cmd_lock;
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struct delayed_work poll_work;
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u8 curr_protocol;
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u8 curr_rf_tech;
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u8 curr_nfc_dep_pni;
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u8 did;
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u16 dep_rwt;
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u8 local_payload_max;
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u8 remote_payload_max;
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struct sk_buff *chaining_skb;
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struct digital_data_exch *data_exch;
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int atn_count;
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int nack_count;
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struct sk_buff *saved_skb;
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u16 target_fsc;
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int (*skb_check_crc)(struct sk_buff *skb);
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void (*skb_add_crc)(struct sk_buff *skb);
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};
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struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
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__u32 supported_protocols,
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__u32 driver_capabilities,
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int tx_headroom,
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int tx_tailroom);
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void nfc_digital_free_device(struct nfc_digital_dev *ndev);
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int nfc_digital_register_device(struct nfc_digital_dev *ndev);
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void nfc_digital_unregister_device(struct nfc_digital_dev *ndev);
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static inline void nfc_digital_set_parent_dev(struct nfc_digital_dev *ndev,
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struct device *dev)
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{
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nfc_set_parent_dev(ndev->nfc_dev, dev);
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}
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static inline void nfc_digital_set_drvdata(struct nfc_digital_dev *dev,
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void *data)
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{
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dev->driver_data = data;
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}
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static inline void *nfc_digital_get_drvdata(struct nfc_digital_dev *dev)
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{
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return dev->driver_data;
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}
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#endif /* __NFC_DIGITAL_H */
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