mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 05:34:13 +08:00
1a09c56f54
When sending an ATR_REQ, the initiator must wait for the ATR_RES at least 'RWT(nfcdep,activation) + dRWT(nfcdep)' and no more than 'RWT(nfcdep,activation) + dRWT(nfcdep) + dT(nfcdep,initiator)'. This gives a timeout value between 1237 ms and 1337 ms. This patch defines DIGITAL_ATR_RES_RWT to 1337 used for the timeout value of ATR_REQ command. For other DEP PDUs, the initiator must wait between 'RWT + dRWT(nfcdep)' and 'RWT + dRWT(nfcdep) + dT(nfcdep,initiator)' where RWT is given by the following formula: '(256 * 16 / f(c)) * 2^wt' where wt is the value of the TO field in the ATR_RES response and is in the range between 0 and 14. This patch declares a mapping table for wt values and gives RWT max values between 100 ms and 5049 ms. This patch also defines DIGITAL_ATR_RES_TO_WT, the maximum wt value in target mode, to 8. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
275 lines
8.8 KiB
C
275 lines
8.8 KiB
C
/*
|
|
* NFC Digital Protocol stack
|
|
* Copyright (c) 2013, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
*/
|
|
|
|
#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;
|
|
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(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 */
|