bf30a67c94
The digital layer of the NFC subsystem currently supports a 'tg_listen_mdaa' driver hook that supports devices that can do mode detection and automatic anticollision. However, there are some devices that can do mode detection but not automatic anitcollision so add the 'tg_listen_md' hook to support those devices. In order for the digital layer to get the RF technology detected by the device from the driver, add the 'tg_get_rf_tech' hook. It is only valid to call this hook immediately after a successful call to 'tg_listen_md'. CC: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Mark A. Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
262 lines
8.6 KiB
C
262 lines
8.6 KiB
C
/*
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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 work_struct 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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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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