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linux/drivers/nfc/pn533.c
Samuel Ortiz dfccd0f580 NFC: pn533: Add some polling entropy 
By not always starting the polling loop from the same modulation, we
avoid entering infinite loops where devices exporting 2 targets (on 2
different modulations) get the same target activated over and over.
If this target is not readable (e.g. a wallet emulating a tag), we will
stay in an error loop for ever.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-08-14 00:35:19 +02:00

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/*
* Copyright (C) 2011 Instituto Nokia de Tecnologia
* Copyright (C) 2012-2013 Tieto Poland
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/nfc.h>
#include <linux/netdevice.h>
#include <net/nfc/nfc.h>
#define VERSION "0.2"
#define PN533_VENDOR_ID 0x4CC
#define PN533_PRODUCT_ID 0x2533
#define SCM_VENDOR_ID 0x4E6
#define SCL3711_PRODUCT_ID 0x5591
#define SONY_VENDOR_ID 0x054c
#define PASORI_PRODUCT_ID 0x02e1
#define ACS_VENDOR_ID 0x072f
#define ACR122U_PRODUCT_ID 0x2200
#define PN533_DEVICE_STD 0x1
#define PN533_DEVICE_PASORI 0x2
#define PN533_DEVICE_ACR122U 0x3
#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
NFC_PROTO_NFC_DEP_MASK |\
NFC_PROTO_ISO14443_B_MASK)
#define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
NFC_PROTO_MIFARE_MASK | \
NFC_PROTO_FELICA_MASK | \
NFC_PROTO_ISO14443_MASK | \
NFC_PROTO_NFC_DEP_MASK)
static const struct usb_device_id pn533_table[] = {
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = PN533_VENDOR_ID,
.idProduct = PN533_PRODUCT_ID,
.driver_info = PN533_DEVICE_STD,
},
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = SCM_VENDOR_ID,
.idProduct = SCL3711_PRODUCT_ID,
.driver_info = PN533_DEVICE_STD,
},
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = SONY_VENDOR_ID,
.idProduct = PASORI_PRODUCT_ID,
.driver_info = PN533_DEVICE_PASORI,
},
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = ACS_VENDOR_ID,
.idProduct = ACR122U_PRODUCT_ID,
.driver_info = PN533_DEVICE_ACR122U,
},
{ }
};
MODULE_DEVICE_TABLE(usb, pn533_table);
/* How much time we spend listening for initiators */
#define PN533_LISTEN_TIME 2
/* Delay between each poll frame (ms) */
#define PN533_POLL_INTERVAL 10
/* Standard pn533 frame definitions (standard and extended)*/
#define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
+ 2) /* data[0] TFI, data[1] CC */
#define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
#define PN533_EXT_FRAME_HEADER_LEN (sizeof(struct pn533_ext_frame) \
+ 2) /* data[0] TFI, data[1] CC */
#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
#define PN533_CMD_DATAFRAME_MAXLEN 240 /* max data length (send) */
/*
* Max extended frame payload len, excluding TFI and CC
* which are already in PN533_FRAME_HEADER_LEN.
*/
#define PN533_STD_FRAME_MAX_PAYLOAD_LEN 263
#define PN533_STD_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
Postamble (1) */
#define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
#define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
/* Half start code (3), LEN (4) should be 0xffff for extended frame */
#define PN533_STD_IS_EXTENDED(hdr) ((hdr)->datalen == 0xFF \
&& (hdr)->datalen_checksum == 0xFF)
#define PN533_EXT_FRAME_CHECKSUM(f) (f->data[be16_to_cpu(f->datalen)])
/* start of frame */
#define PN533_STD_FRAME_SOF 0x00FF
/* standard frame identifier: in/out/error */
#define PN533_STD_FRAME_IDENTIFIER(f) (f->data[0]) /* TFI */
#define PN533_STD_FRAME_DIR_OUT 0xD4
#define PN533_STD_FRAME_DIR_IN 0xD5
/* ACS ACR122 pn533 frame definitions */
#define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
+ 2)
#define PN533_ACR122_TX_FRAME_TAIL_LEN 0
#define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
+ 2)
#define PN533_ACR122_RX_FRAME_TAIL_LEN 2
#define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
/* CCID messages types */
#define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
#define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
#define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
/* PN533 Commands */
#define PN533_FRAME_CMD(f) (f->data[1])
#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
#define PN533_CMD_RF_CONFIGURATION 0x32
#define PN533_CMD_IN_DATA_EXCHANGE 0x40
#define PN533_CMD_IN_COMM_THRU 0x42
#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
#define PN533_CMD_IN_ATR 0x50
#define PN533_CMD_IN_RELEASE 0x52
#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
#define PN533_CMD_TG_GET_DATA 0x86
#define PN533_CMD_TG_SET_DATA 0x8e
#define PN533_CMD_UNDEF 0xff
#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
/* PN533 Return codes */
#define PN533_CMD_RET_MASK 0x3F
#define PN533_CMD_MI_MASK 0x40
#define PN533_CMD_RET_SUCCESS 0x00
struct pn533;
typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
struct sk_buff *resp);
/* structs for pn533 commands */
/* PN533_CMD_GET_FIRMWARE_VERSION */
struct pn533_fw_version {
u8 ic;
u8 ver;
u8 rev;
u8 support;
};
/* PN533_CMD_RF_CONFIGURATION */
#define PN533_CFGITEM_RF_FIELD 0x01
#define PN533_CFGITEM_TIMING 0x02
#define PN533_CFGITEM_MAX_RETRIES 0x05
#define PN533_CFGITEM_PASORI 0x82
#define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
#define PN533_CFGITEM_RF_FIELD_ON 0x1
#define PN533_CFGITEM_RF_FIELD_OFF 0x0
#define PN533_CONFIG_TIMING_102 0xb
#define PN533_CONFIG_TIMING_204 0xc
#define PN533_CONFIG_TIMING_409 0xd
#define PN533_CONFIG_TIMING_819 0xe
#define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
#define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
struct pn533_config_max_retries {
u8 mx_rty_atr;
u8 mx_rty_psl;
u8 mx_rty_passive_act;
} __packed;
struct pn533_config_timing {
u8 rfu;
u8 atr_res_timeout;
u8 dep_timeout;
} __packed;
/* PN533_CMD_IN_LIST_PASSIVE_TARGET */
/* felica commands opcode */
#define PN533_FELICA_OPC_SENSF_REQ 0
#define PN533_FELICA_OPC_SENSF_RES 1
/* felica SENSF_REQ parameters */
#define PN533_FELICA_SENSF_SC_ALL 0xFFFF
#define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
#define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
#define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
/* type B initiator_data values */
#define PN533_TYPE_B_AFI_ALL_FAMILIES 0
#define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
#define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
union pn533_cmd_poll_initdata {
struct {
u8 afi;
u8 polling_method;
} __packed type_b;
struct {
u8 opcode;
__be16 sc;
u8 rc;
u8 tsn;
} __packed felica;
};
/* Poll modulations */
enum {
PN533_POLL_MOD_106KBPS_A,
PN533_POLL_MOD_212KBPS_FELICA,
PN533_POLL_MOD_424KBPS_FELICA,
PN533_POLL_MOD_106KBPS_JEWEL,
PN533_POLL_MOD_847KBPS_B,
PN533_LISTEN_MOD,
__PN533_POLL_MOD_AFTER_LAST,
};
#define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
struct pn533_poll_modulations {
struct {
u8 maxtg;
u8 brty;
union pn533_cmd_poll_initdata initiator_data;
} __packed data;
u8 len;
};
static const struct pn533_poll_modulations poll_mod[] = {
[PN533_POLL_MOD_106KBPS_A] = {
.data = {
.maxtg = 1,
.brty = 0,
},
.len = 2,
},
[PN533_POLL_MOD_212KBPS_FELICA] = {
.data = {
.maxtg = 1,
.brty = 1,
.initiator_data.felica = {
.opcode = PN533_FELICA_OPC_SENSF_REQ,
.sc = PN533_FELICA_SENSF_SC_ALL,
.rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
.tsn = 0x03,
},
},
.len = 7,
},
[PN533_POLL_MOD_424KBPS_FELICA] = {
.data = {
.maxtg = 1,
.brty = 2,
.initiator_data.felica = {
.opcode = PN533_FELICA_OPC_SENSF_REQ,
.sc = PN533_FELICA_SENSF_SC_ALL,
.rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
.tsn = 0x03,
},
},
.len = 7,
},
[PN533_POLL_MOD_106KBPS_JEWEL] = {
.data = {
.maxtg = 1,
.brty = 4,
},
.len = 2,
},
[PN533_POLL_MOD_847KBPS_B] = {
.data = {
.maxtg = 1,
.brty = 8,
.initiator_data.type_b = {
.afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
.polling_method =
PN533_TYPE_B_POLL_METHOD_TIMESLOT,
},
},
.len = 3,
},
[PN533_LISTEN_MOD] = {
.len = 0,
},
};
/* PN533_CMD_IN_ATR */
struct pn533_cmd_activate_response {
u8 status;
u8 nfcid3t[10];
u8 didt;
u8 bst;
u8 brt;
u8 to;
u8 ppt;
/* optional */
u8 gt[];
} __packed;
struct pn533_cmd_jump_dep_response {
u8 status;
u8 tg;
u8 nfcid3t[10];
u8 didt;
u8 bst;
u8 brt;
u8 to;
u8 ppt;
/* optional */
u8 gt[];
} __packed;
/* PN533_TG_INIT_AS_TARGET */
#define PN533_INIT_TARGET_PASSIVE 0x1
#define PN533_INIT_TARGET_DEP 0x2
#define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
#define PN533_INIT_TARGET_RESP_ACTIVE 0x1
#define PN533_INIT_TARGET_RESP_DEP 0x4
enum pn533_protocol_type {
PN533_PROTO_REQ_ACK_RESP = 0,
PN533_PROTO_REQ_RESP
};
struct pn533 {
struct usb_device *udev;
struct usb_interface *interface;
struct nfc_dev *nfc_dev;
u32 device_type;
enum pn533_protocol_type protocol_type;
struct urb *out_urb;
struct urb *in_urb;
struct sk_buff_head resp_q;
struct sk_buff_head fragment_skb;
struct workqueue_struct *wq;
struct work_struct cmd_work;
struct work_struct cmd_complete_work;
struct delayed_work poll_work;
struct work_struct mi_rx_work;
struct work_struct mi_tx_work;
struct work_struct tg_work;
struct work_struct rf_work;
struct list_head cmd_queue;
struct pn533_cmd *cmd;
u8 cmd_pending;
struct mutex cmd_lock; /* protects cmd queue */
void *cmd_complete_mi_arg;
void *cmd_complete_dep_arg;
struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
u8 poll_mod_count;
u8 poll_mod_curr;
u32 poll_protocols;
u32 listen_protocols;
struct timer_list listen_timer;
int cancel_listen;
u8 *gb;
size_t gb_len;
u8 tgt_available_prots;
u8 tgt_active_prot;
u8 tgt_mode;
struct pn533_frame_ops *ops;
};
struct pn533_cmd {
struct list_head queue;
u8 code;
int status;
struct sk_buff *req;
struct sk_buff *resp;
int resp_len;
pn533_send_async_complete_t complete_cb;
void *complete_cb_context;
};
struct pn533_std_frame {
u8 preamble;
__be16 start_frame;
u8 datalen;
u8 datalen_checksum;
u8 data[];
} __packed;
struct pn533_ext_frame { /* Extended Information frame */
u8 preamble;
__be16 start_frame;
__be16 eif_flag; /* fixed to 0xFFFF */
__be16 datalen;
u8 datalen_checksum;
u8 data[];
} __packed;
struct pn533_frame_ops {
void (*tx_frame_init)(void *frame, u8 cmd_code);
void (*tx_frame_finish)(void *frame);
void (*tx_update_payload_len)(void *frame, int len);
int tx_header_len;
int tx_tail_len;
bool (*rx_is_frame_valid)(void *frame, struct pn533 *dev);
int (*rx_frame_size)(void *frame);
int rx_header_len;
int rx_tail_len;
int max_payload_len;
u8 (*get_cmd_code)(void *frame);
};
struct pn533_acr122_ccid_hdr {
u8 type;
u32 datalen;
u8 slot;
u8 seq;
u8 params[3]; /* 3 msg specific bytes or status, error and 1 specific
byte for reposnse msg */
u8 data[]; /* payload */
} __packed;
struct pn533_acr122_apdu_hdr {
u8 class;
u8 ins;
u8 p1;
u8 p2;
} __packed;
struct pn533_acr122_tx_frame {
struct pn533_acr122_ccid_hdr ccid;
struct pn533_acr122_apdu_hdr apdu;
u8 datalen;
u8 data[]; /* pn533 frame: TFI ... */
} __packed;
struct pn533_acr122_rx_frame {
struct pn533_acr122_ccid_hdr ccid;
u8 data[]; /* pn533 frame : TFI ... */
} __packed;
static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
frame->ccid.datalen = sizeof(frame->apdu) + 1; /* sizeof(apdu_hdr) +
sizeof(datalen) */
frame->ccid.slot = 0;
frame->ccid.seq = 0;
frame->ccid.params[0] = 0;
frame->ccid.params[1] = 0;
frame->ccid.params[2] = 0;
frame->data[0] = PN533_STD_FRAME_DIR_OUT;
frame->data[1] = cmd_code;
frame->datalen = 2; /* data[0] + data[1] */
frame->apdu.class = 0xFF;
frame->apdu.ins = 0;
frame->apdu.p1 = 0;
frame->apdu.p2 = 0;
}
static void pn533_acr122_tx_frame_finish(void *_frame)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->ccid.datalen += frame->datalen;
}
static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->datalen += len;
}
static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
{
struct pn533_acr122_rx_frame *frame = _frame;
if (frame->ccid.type != 0x83)
return false;
if (frame->data[frame->ccid.datalen - 2] == 0x63)
return false;
return true;
}
static int pn533_acr122_rx_frame_size(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
/* f->ccid.datalen already includes tail length */
return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
}
static u8 pn533_acr122_get_cmd_code(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
return PN533_FRAME_CMD(f);
}
static struct pn533_frame_ops pn533_acr122_frame_ops = {
.tx_frame_init = pn533_acr122_tx_frame_init,
.tx_frame_finish = pn533_acr122_tx_frame_finish,
.tx_update_payload_len = pn533_acr122_tx_update_payload_len,
.tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
.tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
.rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
.rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
.rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
.rx_frame_size = pn533_acr122_rx_frame_size,
.max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
.get_cmd_code = pn533_acr122_get_cmd_code,
};
/* The rule: value(high byte) + value(low byte) + checksum = 0 */
static inline u8 pn533_ext_checksum(u16 value)
{
return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
}
/* The rule: value + checksum = 0 */
static inline u8 pn533_std_checksum(u8 value)
{
return ~value + 1;
}
/* The rule: sum(data elements) + checksum = 0 */
static u8 pn533_std_data_checksum(u8 *data, int datalen)
{
u8 sum = 0;
int i;
for (i = 0; i < datalen; i++)
sum += data[i];
return pn533_std_checksum(sum);
}
static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
{
struct pn533_std_frame *frame = _frame;
frame->preamble = 0;
frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
PN533_FRAME_CMD(frame) = cmd_code;
frame->datalen = 2;
}
static void pn533_std_tx_frame_finish(void *_frame)
{
struct pn533_std_frame *frame = _frame;
frame->datalen_checksum = pn533_std_checksum(frame->datalen);
PN533_STD_FRAME_CHECKSUM(frame) =
pn533_std_data_checksum(frame->data, frame->datalen);
PN533_STD_FRAME_POSTAMBLE(frame) = 0;
}
static void pn533_std_tx_update_payload_len(void *_frame, int len)
{
struct pn533_std_frame *frame = _frame;
frame->datalen += len;
}
static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
{
u8 checksum;
struct pn533_std_frame *stdf = _frame;
if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
return false;
if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
/* Standard frame code */
dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
checksum = pn533_std_checksum(stdf->datalen);
if (checksum != stdf->datalen_checksum)
return false;
checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
return false;
} else {
/* Extended */
struct pn533_ext_frame *eif = _frame;
dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
if (checksum != eif->datalen_checksum)
return false;
/* check data checksum */
checksum = pn533_std_data_checksum(eif->data,
be16_to_cpu(eif->datalen));
if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
return false;
}
return true;
}
static bool pn533_std_rx_frame_is_ack(struct pn533_std_frame *frame)
{
if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
return false;
if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
return false;
return true;
}
static inline int pn533_std_rx_frame_size(void *frame)
{
struct pn533_std_frame *f = frame;
/* check for Extended Information frame */
if (PN533_STD_IS_EXTENDED(f)) {
struct pn533_ext_frame *eif = frame;
return sizeof(struct pn533_ext_frame)
+ be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
}
return sizeof(struct pn533_std_frame) + f->datalen +
PN533_STD_FRAME_TAIL_LEN;
}
static u8 pn533_std_get_cmd_code(void *frame)
{
struct pn533_std_frame *f = frame;
struct pn533_ext_frame *eif = frame;
if (PN533_STD_IS_EXTENDED(f))
return PN533_FRAME_CMD(eif);
else
return PN533_FRAME_CMD(f);
}
static struct pn533_frame_ops pn533_std_frame_ops = {
.tx_frame_init = pn533_std_tx_frame_init,
.tx_frame_finish = pn533_std_tx_frame_finish,
.tx_update_payload_len = pn533_std_tx_update_payload_len,
.tx_header_len = PN533_STD_FRAME_HEADER_LEN,
.tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
.rx_is_frame_valid = pn533_std_rx_frame_is_valid,
.rx_frame_size = pn533_std_rx_frame_size,
.rx_header_len = PN533_STD_FRAME_HEADER_LEN,
.rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
.max_payload_len = PN533_STD_FRAME_MAX_PAYLOAD_LEN,
.get_cmd_code = pn533_std_get_cmd_code,
};
static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
{
return (dev->ops->get_cmd_code(frame) ==
PN533_CMD_RESPONSE(dev->cmd->code));
}
static void pn533_recv_response(struct urb *urb)
{
struct pn533 *dev = urb->context;
struct pn533_cmd *cmd = dev->cmd;
u8 *in_frame;
cmd->status = urb->status;
switch (urb->status) {
case 0:
break; /* success */
case -ECONNRESET:
case -ENOENT:
nfc_dev_dbg(&dev->interface->dev,
"The urb has been canceled (status %d)",
urb->status);
goto sched_wq;
case -ESHUTDOWN:
default:
nfc_dev_err(&dev->interface->dev,
"Urb failure (status %d)", urb->status);
goto sched_wq;
}
in_frame = dev->in_urb->transfer_buffer;
nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
dev->ops->rx_frame_size(in_frame), false);
if (!dev->ops->rx_is_frame_valid(in_frame, dev)) {
nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
cmd->status = -EIO;
goto sched_wq;
}
if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
nfc_dev_err(&dev->interface->dev,
"It it not the response to the last command");
cmd->status = -EIO;
goto sched_wq;
}
sched_wq:
queue_work(dev->wq, &dev->cmd_complete_work);
}
static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
{
dev->in_urb->complete = pn533_recv_response;
return usb_submit_urb(dev->in_urb, flags);
}
static void pn533_recv_ack(struct urb *urb)
{
struct pn533 *dev = urb->context;
struct pn533_cmd *cmd = dev->cmd;
struct pn533_std_frame *in_frame;
int rc;
cmd->status = urb->status;
switch (urb->status) {
case 0:
break; /* success */
case -ECONNRESET:
case -ENOENT:
nfc_dev_dbg(&dev->interface->dev,
"The urb has been stopped (status %d)",
urb->status);
goto sched_wq;
case -ESHUTDOWN:
default:
nfc_dev_err(&dev->interface->dev,
"Urb failure (status %d)", urb->status);
goto sched_wq;
}
in_frame = dev->in_urb->transfer_buffer;
if (!pn533_std_rx_frame_is_ack(in_frame)) {
nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
cmd->status = -EIO;
goto sched_wq;
}
rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"usb_submit_urb failed with result %d", rc);
cmd->status = rc;
goto sched_wq;
}
return;
sched_wq:
queue_work(dev->wq, &dev->cmd_complete_work);
}
static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
{
dev->in_urb->complete = pn533_recv_ack;
return usb_submit_urb(dev->in_urb, flags);
}
static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
{
u8 ack[PN533_STD_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
/* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
dev->out_urb->transfer_buffer = ack;
dev->out_urb->transfer_buffer_length = sizeof(ack);
rc = usb_submit_urb(dev->out_urb, flags);
return rc;
}
static int __pn533_send_frame_async(struct pn533 *dev,
struct sk_buff *out,
struct sk_buff *in,
int in_len)
{
int rc;
dev->out_urb->transfer_buffer = out->data;
dev->out_urb->transfer_buffer_length = out->len;
dev->in_urb->transfer_buffer = in->data;
dev->in_urb->transfer_buffer_length = in_len;
print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
out->data, out->len, false);
rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
if (rc)
return rc;
if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
/* request for response for sent packet directly */
rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
if (rc)
goto error;
} else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
/* request for ACK if that's the case */
rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
if (rc)
goto error;
}
return 0;
error:
usb_unlink_urb(dev->out_urb);
return rc;
}
static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
struct sk_buff *skb)
{
/* payload is already there, just update datalen */
int payload_len = skb->len;
struct pn533_frame_ops *ops = dev->ops;
skb_push(skb, ops->tx_header_len);
skb_put(skb, ops->tx_tail_len);
ops->tx_frame_init(skb->data, cmd_code);
ops->tx_update_payload_len(skb->data, payload_len);
ops->tx_frame_finish(skb->data);
}
static int pn533_send_async_complete(struct pn533 *dev)
{
struct pn533_cmd *cmd = dev->cmd;
int status = cmd->status;
struct sk_buff *req = cmd->req;
struct sk_buff *resp = cmd->resp;
int rc;
dev_kfree_skb(req);
if (status < 0) {
rc = cmd->complete_cb(dev, cmd->complete_cb_context,
ERR_PTR(status));
dev_kfree_skb(resp);
goto done;
}
skb_put(resp, dev->ops->rx_frame_size(resp->data));
skb_pull(resp, dev->ops->rx_header_len);
skb_trim(resp, resp->len - dev->ops->rx_tail_len);
rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
done:
kfree(cmd);
dev->cmd = NULL;
return rc;
}
static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
struct sk_buff *req, struct sk_buff *resp,
int resp_len,
pn533_send_async_complete_t complete_cb,
void *complete_cb_context)
{
struct pn533_cmd *cmd;
int rc = 0;
nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", cmd_code);
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
cmd->code = cmd_code;
cmd->req = req;
cmd->resp = resp;
cmd->resp_len = resp_len;
cmd->complete_cb = complete_cb;
cmd->complete_cb_context = complete_cb_context;
pn533_build_cmd_frame(dev, cmd_code, req);
mutex_lock(&dev->cmd_lock);
if (!dev->cmd_pending) {
rc = __pn533_send_frame_async(dev, req, resp, resp_len);
if (rc)
goto error;
dev->cmd_pending = 1;
dev->cmd = cmd;
goto unlock;
}
nfc_dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x", __func__,
cmd_code);
INIT_LIST_HEAD(&cmd->queue);
list_add_tail(&cmd->queue, &dev->cmd_queue);
goto unlock;
error:
kfree(cmd);
unlock:
mutex_unlock(&dev->cmd_lock);
return rc;
}
static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
struct sk_buff *req,
pn533_send_async_complete_t complete_cb,
void *complete_cb_context)
{
struct sk_buff *resp;
int rc;
int resp_len = dev->ops->rx_header_len +
dev->ops->max_payload_len +
dev->ops->rx_tail_len;
resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
if (!resp)
return -ENOMEM;
rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
complete_cb_context);
if (rc)
dev_kfree_skb(resp);
return rc;
}
static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
struct sk_buff *req,
pn533_send_async_complete_t complete_cb,
void *complete_cb_context)
{
struct sk_buff *resp;
int rc;
int resp_len = dev->ops->rx_header_len +
dev->ops->max_payload_len +
dev->ops->rx_tail_len;
resp = alloc_skb(resp_len, GFP_KERNEL);
if (!resp)
return -ENOMEM;
rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
complete_cb_context);
if (rc)
dev_kfree_skb(resp);
return rc;
}
/*
* pn533_send_cmd_direct_async
*
* The function sends a piority cmd directly to the chip omiting the cmd
* queue. It's intended to be used by chaining mechanism of received responses
* where the host has to request every single chunk of data before scheduling
* next cmd from the queue.
*/
static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
struct sk_buff *req,
pn533_send_async_complete_t complete_cb,
void *complete_cb_context)
{
struct sk_buff *resp;
struct pn533_cmd *cmd;
int rc;
int resp_len = dev->ops->rx_header_len +
dev->ops->max_payload_len +
dev->ops->rx_tail_len;
resp = alloc_skb(resp_len, GFP_KERNEL);
if (!resp)
return -ENOMEM;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd) {
dev_kfree_skb(resp);
return -ENOMEM;
}
cmd->code = cmd_code;
cmd->req = req;
cmd->resp = resp;
cmd->resp_len = resp_len;
cmd->complete_cb = complete_cb;
cmd->complete_cb_context = complete_cb_context;
pn533_build_cmd_frame(dev, cmd_code, req);
rc = __pn533_send_frame_async(dev, req, resp, resp_len);
if (rc < 0) {
dev_kfree_skb(resp);
kfree(cmd);
} else {
dev->cmd = cmd;
}
return rc;
}
static void pn533_wq_cmd_complete(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
int rc;
rc = pn533_send_async_complete(dev);
if (rc != -EINPROGRESS)
queue_work(dev->wq, &dev->cmd_work);
}
static void pn533_wq_cmd(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, cmd_work);
struct pn533_cmd *cmd;
int rc;
mutex_lock(&dev->cmd_lock);
if (list_empty(&dev->cmd_queue)) {
dev->cmd_pending = 0;
mutex_unlock(&dev->cmd_lock);
return;
}
cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
list_del(&cmd->queue);
mutex_unlock(&dev->cmd_lock);
rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len);
if (rc < 0) {
dev_kfree_skb(cmd->req);
dev_kfree_skb(cmd->resp);
kfree(cmd);
return;
}
dev->cmd = cmd;
}
struct pn533_sync_cmd_response {
struct sk_buff *resp;
struct completion done;
};
static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
struct sk_buff *resp)
{
struct pn533_sync_cmd_response *arg = _arg;
arg->resp = resp;
complete(&arg->done);
return 0;
}
/* pn533_send_cmd_sync
*
* Please note the req parameter is freed inside the function to
* limit a number of return value interpretations by the caller.
*
* 1. negative in case of error during TX path -> req should be freed
*
* 2. negative in case of error during RX path -> req should not be freed
* as it's been already freed at the begining of RX path by
* async_complete_cb.
*
* 3. valid pointer in case of succesfult RX path
*
* A caller has to check a return value with IS_ERR macro. If the test pass,
* the returned pointer is valid.
*
* */
static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
struct sk_buff *req)
{
int rc;
struct pn533_sync_cmd_response arg;
init_completion(&arg.done);
rc = pn533_send_cmd_async(dev, cmd_code, req,
pn533_send_sync_complete, &arg);
if (rc) {
dev_kfree_skb(req);
return ERR_PTR(rc);
}
wait_for_completion(&arg.done);
return arg.resp;
}
static void pn533_send_complete(struct urb *urb)
{
struct pn533 *dev = urb->context;
switch (urb->status) {
case 0:
break; /* success */
case -ECONNRESET:
case -ENOENT:
nfc_dev_dbg(&dev->interface->dev,
"The urb has been stopped (status %d)",
urb->status);
break;
case -ESHUTDOWN:
default:
nfc_dev_err(&dev->interface->dev,
"Urb failure (status %d)", urb->status);
}
}
static void pn533_abort_cmd(struct pn533 *dev, gfp_t flags)
{
/* ACR122U does not support any command which aborts last
* issued command i.e. as ACK for standard PN533. Additionally,
* it behaves stange, sending broken or incorrect responses,
* when we cancel urb before the chip will send response.
*/
if (dev->device_type == PN533_DEVICE_ACR122U)
return;
/* An ack will cancel the last issued command */
pn533_send_ack(dev, flags);
/* cancel the urb request */
usb_kill_urb(dev->in_urb);
}
static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
{
struct sk_buff *skb;
skb = alloc_skb(dev->ops->tx_header_len +
size +
dev->ops->tx_tail_len, GFP_KERNEL);
if (skb)
skb_reserve(skb, dev->ops->tx_header_len);
return skb;
}
struct pn533_target_type_a {
__be16 sens_res;
u8 sel_res;
u8 nfcid_len;
u8 nfcid_data[];
} __packed;
#define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
#define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
#define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
#define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
#define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
#define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
#define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
#define PN533_TYPE_A_SEL_PROT_MIFARE 0
#define PN533_TYPE_A_SEL_PROT_ISO14443 1
#define PN533_TYPE_A_SEL_PROT_DEP 2
#define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
int target_data_len)
{
u8 ssd;
u8 platconf;
if (target_data_len < sizeof(struct pn533_target_type_a))
return false;
/* The lenght check of nfcid[] and ats[] are not being performed because
the values are not being used */
/* Requirement 4.6.3.3 from NFC Forum Digital Spec */
ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
(ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
return false;
/* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
return false;
return true;
}
static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
int tgt_data_len)
{
struct pn533_target_type_a *tgt_type_a;
tgt_type_a = (struct pn533_target_type_a *)tgt_data;
if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
return -EPROTO;
switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
case PN533_TYPE_A_SEL_PROT_MIFARE:
nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
break;
case PN533_TYPE_A_SEL_PROT_ISO14443:
nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
break;
case PN533_TYPE_A_SEL_PROT_DEP:
nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
break;
case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
NFC_PROTO_NFC_DEP_MASK;
break;
}
nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
nfc_tgt->sel_res = tgt_type_a->sel_res;
nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
return 0;
}
struct pn533_target_felica {
u8 pol_res;
u8 opcode;
u8 nfcid2[NFC_NFCID2_MAXSIZE];
u8 pad[8];
/* optional */
u8 syst_code[];
} __packed;
#define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
#define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
int target_data_len)
{
if (target_data_len < sizeof(struct pn533_target_felica))
return false;
if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
return false;
return true;
}
static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
int tgt_data_len)
{
struct pn533_target_felica *tgt_felica;
tgt_felica = (struct pn533_target_felica *)tgt_data;
if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
return -EPROTO;
if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
(tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
else
nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
nfc_tgt->sensf_res_len = 9;
memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
return 0;
}
struct pn533_target_jewel {
__be16 sens_res;
u8 jewelid[4];
} __packed;
static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
int target_data_len)
{
u8 ssd;
u8 platconf;
if (target_data_len < sizeof(struct pn533_target_jewel))
return false;
/* Requirement 4.6.3.3 from NFC Forum Digital Spec */
ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
(ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
return false;
return true;
}
static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
int tgt_data_len)
{
struct pn533_target_jewel *tgt_jewel;
tgt_jewel = (struct pn533_target_jewel *)tgt_data;
if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
return -EPROTO;
nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
nfc_tgt->nfcid1_len = 4;
memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
return 0;
}
struct pn533_type_b_prot_info {
u8 bitrate;
u8 fsci_type;
u8 fwi_adc_fo;
} __packed;
#define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
#define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
#define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
struct pn533_type_b_sens_res {
u8 opcode;
u8 nfcid[4];
u8 appdata[4];
struct pn533_type_b_prot_info prot_info;
} __packed;
#define PN533_TYPE_B_OPC_SENSB_RES 0x50
struct pn533_target_type_b {
struct pn533_type_b_sens_res sensb_res;
u8 attrib_res_len;
u8 attrib_res[];
} __packed;
static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
int target_data_len)
{
if (target_data_len < sizeof(struct pn533_target_type_b))
return false;
if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
return false;
if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
PN533_TYPE_B_PROT_TYPE_RFU_MASK)
return false;
return true;
}
static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
int tgt_data_len)
{
struct pn533_target_type_b *tgt_type_b;
tgt_type_b = (struct pn533_target_type_b *)tgt_data;
if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
return -EPROTO;
nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
return 0;
}
static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
int tgdata_len)
{
struct nfc_target nfc_tgt;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
dev->poll_mod_curr);
if (tg != 1)
return -EPROTO;
memset(&nfc_tgt, 0, sizeof(struct nfc_target));
switch (dev->poll_mod_curr) {
case PN533_POLL_MOD_106KBPS_A:
rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
break;
case PN533_POLL_MOD_212KBPS_FELICA:
case PN533_POLL_MOD_424KBPS_FELICA:
rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
break;
case PN533_POLL_MOD_106KBPS_JEWEL:
rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
break;
case PN533_POLL_MOD_847KBPS_B:
rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
break;
default:
nfc_dev_err(&dev->interface->dev,
"Unknown current poll modulation");
return -EPROTO;
}
if (rc)
return rc;
if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
nfc_dev_dbg(&dev->interface->dev,
"The Tg found doesn't have the desired protocol");
return -EAGAIN;
}
nfc_dev_dbg(&dev->interface->dev,
"Target found - supported protocols: 0x%x",
nfc_tgt.supported_protocols);
dev->tgt_available_prots = nfc_tgt.supported_protocols;
nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
return 0;
}
static inline void pn533_poll_next_mod(struct pn533 *dev)
{
dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
}
static void pn533_poll_reset_mod_list(struct pn533 *dev)
{
dev->poll_mod_count = 0;
}
static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
{
dev->poll_mod_active[dev->poll_mod_count] =
(struct pn533_poll_modulations *)&poll_mod[mod_index];
dev->poll_mod_count++;
}
static void pn533_poll_create_mod_list(struct pn533 *dev,
u32 im_protocols, u32 tm_protocols)
{
pn533_poll_reset_mod_list(dev);
if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
(im_protocols & NFC_PROTO_ISO14443_MASK) ||
(im_protocols & NFC_PROTO_NFC_DEP_MASK))
pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
if (im_protocols & NFC_PROTO_FELICA_MASK ||
im_protocols & NFC_PROTO_NFC_DEP_MASK) {
pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
}
if (im_protocols & NFC_PROTO_JEWEL_MASK)
pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
if (tm_protocols)
pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
}
static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
{
u8 nbtg, tg, *tgdata;
int rc, tgdata_len;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
nbtg = resp->data[0];
tg = resp->data[1];
tgdata = &resp->data[2];
tgdata_len = resp->len - 2; /* nbtg + tg */
if (nbtg) {
rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
/* We must stop the poll after a valid target found */
if (rc == 0) {
pn533_poll_reset_mod_list(dev);
return 0;
}
}
return -EAGAIN;
}
static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
{
struct sk_buff *skb;
u8 *felica, *nfcid3, *gb;
u8 *gbytes = dev->gb;
size_t gbytes_len = dev->gb_len;
u8 felica_params[18] = {0x1, 0xfe, /* DEP */
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0xff, 0xff}; /* System code */
u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
0x0, 0x0, 0x0,
0x40}; /* SEL_RES for DEP */
unsigned int skb_len = 36 + /* mode (1), mifare (6),
felica (18), nfcid3 (10), gb_len (1) */
gbytes_len +
1; /* len Tk*/
skb = pn533_alloc_skb(dev, skb_len);
if (!skb)
return NULL;
/* DEP support only */
*skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
/* MIFARE params */
memcpy(skb_put(skb, 6), mifare_params, 6);
/* Felica params */
felica = skb_put(skb, 18);
memcpy(felica, felica_params, 18);
get_random_bytes(felica + 2, 6);
/* NFCID3 */
nfcid3 = skb_put(skb, 10);
memset(nfcid3, 0, 10);
memcpy(nfcid3, felica, 8);
/* General bytes */
*skb_put(skb, 1) = gbytes_len;
gb = skb_put(skb, gbytes_len);
memcpy(gb, gbytes, gbytes_len);
/* Len Tk */
*skb_put(skb, 1) = 0;
return skb;
}
#define PN533_CMD_DATAEXCH_HEAD_LEN 1
#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
u8 status;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (IS_ERR(resp))
return PTR_ERR(resp);
status = resp->data[0];
skb_pull(resp, sizeof(status));
if (status != 0) {
nfc_tm_deactivated(dev->nfc_dev);
dev->tgt_mode = 0;
dev_kfree_skb(resp);
return 0;
}
return nfc_tm_data_received(dev->nfc_dev, resp);
}
static void pn533_wq_tg_get_data(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, tg_work);
struct sk_buff *skb;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(dev, 0);
if (!skb)
return;
rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
pn533_tm_get_data_complete, NULL);
if (rc < 0)
dev_kfree_skb(skb);
return;
}
#define ATR_REQ_GB_OFFSET 17
static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
{
u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
size_t gb_len;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (resp->len < ATR_REQ_GB_OFFSET + 1)
return -EINVAL;
mode = resp->data[0];
cmd = &resp->data[1];
nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
mode, resp->len);
if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
PN533_INIT_TARGET_RESP_ACTIVE)
comm_mode = NFC_COMM_ACTIVE;
if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
return -EOPNOTSUPP;
gb = cmd + ATR_REQ_GB_OFFSET;
gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
comm_mode, gb, gb_len);
if (rc < 0) {
nfc_dev_err(&dev->interface->dev,
"Error when signaling target activation");
return rc;
}
dev->tgt_mode = 1;
queue_work(dev->wq, &dev->tg_work);
return 0;
}
static void pn533_listen_mode_timer(unsigned long data)
{
struct pn533 *dev = (struct pn533 *)data;
nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
dev->cancel_listen = 1;
pn533_poll_next_mod(dev);
queue_delayed_work(dev->wq, &dev->poll_work,
msecs_to_jiffies(PN533_POLL_INTERVAL));
}
static int pn533_rf_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
int rc = 0;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (IS_ERR(resp)) {
rc = PTR_ERR(resp);
nfc_dev_err(&dev->interface->dev, "%s RF setting error %d",
__func__, rc);
return rc;
}
queue_delayed_work(dev->wq, &dev->poll_work,
msecs_to_jiffies(PN533_POLL_INTERVAL));
dev_kfree_skb(resp);
return rc;
}
static void pn533_wq_rf(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, rf_work);
struct sk_buff *skb;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(dev, 2);
if (!skb)
return;
*skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
*skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
pn533_rf_complete, NULL);
if (rc < 0) {
dev_kfree_skb(skb);
nfc_dev_err(&dev->interface->dev, "RF setting error %d", rc);
}
return;
}
static int pn533_poll_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
struct pn533_poll_modulations *cur_mod;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (IS_ERR(resp)) {
rc = PTR_ERR(resp);
nfc_dev_err(&dev->interface->dev, "%s Poll complete error %d",
__func__, rc);
if (rc == -ENOENT) {
if (dev->poll_mod_count != 0)
return rc;
else
goto stop_poll;
} else if (rc < 0) {
nfc_dev_err(&dev->interface->dev,
"Error %d when running poll", rc);
goto stop_poll;
}
}
cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
if (cur_mod->len == 0) { /* Target mode */
del_timer(&dev->listen_timer);
rc = pn533_init_target_complete(dev, resp);
goto done;
}
/* Initiator mode */
rc = pn533_start_poll_complete(dev, resp);
if (!rc)
goto done;
if (!dev->poll_mod_count) {
nfc_dev_dbg(&dev->interface->dev, "Polling has been stopped.");
goto done;
}
pn533_poll_next_mod(dev);
/* Not target found, turn radio off */
queue_work(dev->wq, &dev->rf_work);
done:
dev_kfree_skb(resp);
return rc;
stop_poll:
nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
pn533_poll_reset_mod_list(dev);
dev->poll_protocols = 0;
return rc;
}
static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
struct pn533_poll_modulations *mod)
{
struct sk_buff *skb;
skb = pn533_alloc_skb(dev, mod->len);
if (!skb)
return NULL;
memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
return skb;
}
static int pn533_send_poll_frame(struct pn533 *dev)
{
struct pn533_poll_modulations *mod;
struct sk_buff *skb;
int rc;
u8 cmd_code;
mod = dev->poll_mod_active[dev->poll_mod_curr];
nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
__func__, mod->len);
if (mod->len == 0) { /* Listen mode */
cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
skb = pn533_alloc_poll_tg_frame(dev);
} else { /* Polling mode */
cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
skb = pn533_alloc_poll_in_frame(dev, mod);
}
if (!skb) {
nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
return -ENOMEM;
}
rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
NULL);
if (rc < 0) {
dev_kfree_skb(skb);
nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
}
return rc;
}
static void pn533_wq_poll(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
struct pn533_poll_modulations *cur_mod;
int rc;
cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
nfc_dev_dbg(&dev->interface->dev,
"%s cancel_listen %d modulation len %d",
__func__, dev->cancel_listen, cur_mod->len);
if (dev->cancel_listen == 1) {
dev->cancel_listen = 0;
pn533_abort_cmd(dev, GFP_ATOMIC);
}
rc = pn533_send_poll_frame(dev);
if (rc)
return;
if (cur_mod->len == 0 && dev->poll_mod_count > 1)
mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
return;
}
static int pn533_start_poll(struct nfc_dev *nfc_dev,
u32 im_protocols, u32 tm_protocols)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
u8 rand_mod;
nfc_dev_dbg(&dev->interface->dev,
"%s: im protocols 0x%x tm protocols 0x%x",
__func__, im_protocols, tm_protocols);
if (dev->tgt_active_prot) {
nfc_dev_err(&dev->interface->dev,
"Cannot poll with a target already activated");
return -EBUSY;
}
if (dev->tgt_mode) {
nfc_dev_err(&dev->interface->dev,
"Cannot poll while already being activated");
return -EBUSY;
}
if (tm_protocols) {
dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
if (dev->gb == NULL)
tm_protocols = 0;
}
pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
dev->poll_protocols = im_protocols;
dev->listen_protocols = tm_protocols;
/* Do not always start polling from the same modulation */
get_random_bytes(&rand_mod, sizeof(rand_mod));
rand_mod %= dev->poll_mod_count;
dev->poll_mod_curr = rand_mod;
return pn533_send_poll_frame(dev);
}
static void pn533_stop_poll(struct nfc_dev *nfc_dev)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
del_timer(&dev->listen_timer);
if (!dev->poll_mod_count) {
nfc_dev_dbg(&dev->interface->dev,
"Polling operation was not running");
return;
}
pn533_abort_cmd(dev, GFP_KERNEL);
flush_delayed_work(&dev->poll_work);
pn533_poll_reset_mod_list(dev);
}
static int pn533_activate_target_nfcdep(struct pn533 *dev)
{
struct pn533_cmd_activate_response *rsp;
u16 gt_len;
int rc;
struct sk_buff *skb;
struct sk_buff *resp;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
if (!skb)
return -ENOMEM;
*skb_put(skb, sizeof(u8)) = 1; /* TG */
*skb_put(skb, sizeof(u8)) = 0; /* Next */
resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
if (IS_ERR(resp))
return PTR_ERR(resp);
rsp = (struct pn533_cmd_activate_response *)resp->data;
rc = rsp->status & PN533_CMD_RET_MASK;
if (rc != PN533_CMD_RET_SUCCESS) {
nfc_dev_err(&dev->interface->dev,
"Target activation failed (error 0x%x)", rc);
dev_kfree_skb(resp);
return -EIO;
}
/* ATR_RES general bytes are located at offset 16 */
gt_len = resp->len - 16;
rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
dev_kfree_skb(resp);
return rc;
}
static int pn533_activate_target(struct nfc_dev *nfc_dev,
struct nfc_target *target, u32 protocol)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
protocol);
if (dev->poll_mod_count) {
nfc_dev_err(&dev->interface->dev,
"Cannot activate while polling");
return -EBUSY;
}
if (dev->tgt_active_prot) {
nfc_dev_err(&dev->interface->dev,
"There is already an active target");
return -EBUSY;
}
if (!dev->tgt_available_prots) {
nfc_dev_err(&dev->interface->dev,
"There is no available target to activate");
return -EINVAL;
}
if (!(dev->tgt_available_prots & (1 << protocol))) {
nfc_dev_err(&dev->interface->dev,
"Target doesn't support requested proto %u",
protocol);
return -EINVAL;
}
if (protocol == NFC_PROTO_NFC_DEP) {
rc = pn533_activate_target_nfcdep(dev);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Activating target with DEP failed %d", rc);
return rc;
}
}
dev->tgt_active_prot = protocol;
dev->tgt_available_prots = 0;
return 0;
}
static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
struct nfc_target *target)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
struct sk_buff *skb;
struct sk_buff *resp;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (!dev->tgt_active_prot) {
nfc_dev_err(&dev->interface->dev, "There is no active target");
return;
}
dev->tgt_active_prot = 0;
skb_queue_purge(&dev->resp_q);
skb = pn533_alloc_skb(dev, sizeof(u8));
if (!skb)
return;
*skb_put(skb, 1) = 1; /* TG*/
resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
if (IS_ERR(resp))
return;
rc = resp->data[0] & PN533_CMD_RET_MASK;
if (rc != PN533_CMD_RET_SUCCESS)
nfc_dev_err(&dev->interface->dev,
"Error 0x%x when releasing the target", rc);
dev_kfree_skb(resp);
return;
}
static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
struct pn533_cmd_jump_dep_response *rsp;
u8 target_gt_len;
int rc;
u8 active = *(u8 *)arg;
kfree(arg);
if (IS_ERR(resp))
return PTR_ERR(resp);
if (dev->tgt_available_prots &&
!(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
nfc_dev_err(&dev->interface->dev,
"The target does not support DEP");
rc = -EINVAL;
goto error;
}
rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
rc = rsp->status & PN533_CMD_RET_MASK;
if (rc != PN533_CMD_RET_SUCCESS) {
nfc_dev_err(&dev->interface->dev,
"Bringing DEP link up failed (error 0x%x)", rc);
goto error;
}
if (!dev->tgt_available_prots) {
struct nfc_target nfc_target;
nfc_dev_dbg(&dev->interface->dev, "Creating new target");
nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
nfc_target.nfcid1_len = 10;
memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
if (rc)
goto error;
dev->tgt_available_prots = 0;
}
dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
/* ATR_RES general bytes are located at offset 17 */
target_gt_len = resp->len - 17;
rc = nfc_set_remote_general_bytes(dev->nfc_dev,
rsp->gt, target_gt_len);
if (rc == 0)
rc = nfc_dep_link_is_up(dev->nfc_dev,
dev->nfc_dev->targets[0].idx,
!active, NFC_RF_INITIATOR);
error:
dev_kfree_skb(resp);
return rc;
}
static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
#define PASSIVE_DATA_LEN 5
static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
u8 comm_mode, u8 *gb, size_t gb_len)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
struct sk_buff *skb;
int rc, skb_len;
u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (dev->poll_mod_count) {
nfc_dev_err(&dev->interface->dev,
"Cannot bring the DEP link up while polling");
return -EBUSY;
}
if (dev->tgt_active_prot) {
nfc_dev_err(&dev->interface->dev,
"There is already an active target");
return -EBUSY;
}
skb_len = 3 + gb_len; /* ActPass + BR + Next */
skb_len += PASSIVE_DATA_LEN;
/* NFCID3 */
skb_len += NFC_NFCID3_MAXSIZE;
if (target && !target->nfcid2_len) {
nfcid3[0] = 0x1;
nfcid3[1] = 0xfe;
get_random_bytes(nfcid3 + 2, 6);
}
skb = pn533_alloc_skb(dev, skb_len);
if (!skb)
return -ENOMEM;
*skb_put(skb, 1) = !comm_mode; /* ActPass */
*skb_put(skb, 1) = 0x02; /* 424 kbps */
next = skb_put(skb, 1); /* Next */
*next = 0;
/* Copy passive data */
memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
*next |= 1;
/* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
if (target && target->nfcid2_len)
memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
target->nfcid2_len);
else
memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
NFC_NFCID3_MAXSIZE);
*next |= 2;
if (gb != NULL && gb_len > 0) {
memcpy(skb_put(skb, gb_len), gb, gb_len);
*next |= 4; /* We have some Gi */
} else {
*next = 0;
}
arg = kmalloc(sizeof(*arg), GFP_KERNEL);
if (!arg) {
dev_kfree_skb(skb);
return -ENOMEM;
}
*arg = !comm_mode;
pn533_rf_field(dev->nfc_dev, 0);
rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
pn533_in_dep_link_up_complete, arg);
if (rc < 0) {
dev_kfree_skb(skb);
kfree(arg);
}
return rc;
}
static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
pn533_poll_reset_mod_list(dev);
if (dev->tgt_mode || dev->tgt_active_prot)
pn533_abort_cmd(dev, GFP_KERNEL);
dev->tgt_active_prot = 0;
dev->tgt_mode = 0;
skb_queue_purge(&dev->resp_q);
return 0;
}
struct pn533_data_exchange_arg {
data_exchange_cb_t cb;
void *cb_context;
};
static struct sk_buff *pn533_build_response(struct pn533 *dev)
{
struct sk_buff *skb, *tmp, *t;
unsigned int skb_len = 0, tmp_len = 0;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (skb_queue_empty(&dev->resp_q))
return NULL;
if (skb_queue_len(&dev->resp_q) == 1) {
skb = skb_dequeue(&dev->resp_q);
goto out;
}
skb_queue_walk_safe(&dev->resp_q, tmp, t)
skb_len += tmp->len;
nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
__func__, skb_len);
skb = alloc_skb(skb_len, GFP_KERNEL);
if (skb == NULL)
goto out;
skb_put(skb, skb_len);
skb_queue_walk_safe(&dev->resp_q, tmp, t) {
memcpy(skb->data + tmp_len, tmp->data, tmp->len);
tmp_len += tmp->len;
}
out:
skb_queue_purge(&dev->resp_q);
return skb;
}
static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
struct sk_buff *resp)
{
struct pn533_data_exchange_arg *arg = _arg;
struct sk_buff *skb;
int rc = 0;
u8 status, ret, mi;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (IS_ERR(resp)) {
rc = PTR_ERR(resp);
goto _error;
}
status = resp->data[0];
ret = status & PN533_CMD_RET_MASK;
mi = status & PN533_CMD_MI_MASK;
skb_pull(resp, sizeof(status));
if (ret != PN533_CMD_RET_SUCCESS) {
nfc_dev_err(&dev->interface->dev,
"Exchanging data failed (error 0x%x)", ret);
rc = -EIO;
goto error;
}
skb_queue_tail(&dev->resp_q, resp);
if (mi) {
dev->cmd_complete_mi_arg = arg;
queue_work(dev->wq, &dev->mi_rx_work);
return -EINPROGRESS;
}
/* Prepare for the next round */
if (skb_queue_len(&dev->fragment_skb) > 0) {
dev->cmd_complete_dep_arg = arg;
queue_work(dev->wq, &dev->mi_tx_work);
return -EINPROGRESS;
}
skb = pn533_build_response(dev);
if (!skb)
goto error;
arg->cb(arg->cb_context, skb, 0);
kfree(arg);
return 0;
error:
dev_kfree_skb(resp);
_error:
skb_queue_purge(&dev->resp_q);
arg->cb(arg->cb_context, NULL, rc);
kfree(arg);
return rc;
}
/* Split the Tx skb into small chunks */
static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
{
struct sk_buff *frag;
int frag_size;
do {
/* Remaining size */
if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
frag_size = PN533_CMD_DATAFRAME_MAXLEN;
else
frag_size = skb->len;
/* Allocate and reserve */
frag = pn533_alloc_skb(dev, frag_size);
if (!frag) {
skb_queue_purge(&dev->fragment_skb);
break;
}
/* Reserve the TG/MI byte */
skb_reserve(frag, 1);
/* MI + TG */
if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
*skb_push(frag, sizeof(u8)) = (PN533_CMD_MI_MASK | 1);
else
*skb_push(frag, sizeof(u8)) = 1; /* TG */
memcpy(skb_put(frag, frag_size), skb->data, frag_size);
/* Reduce the size of incoming buffer */
skb_pull(skb, frag_size);
/* Add this to skb_queue */
skb_queue_tail(&dev->fragment_skb, frag);
} while (skb->len > 0);
dev_kfree_skb(skb);
return skb_queue_len(&dev->fragment_skb);
}
static int pn533_transceive(struct nfc_dev *nfc_dev,
struct nfc_target *target, struct sk_buff *skb,
data_exchange_cb_t cb, void *cb_context)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
struct pn533_data_exchange_arg *arg = NULL;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (!dev->tgt_active_prot) {
nfc_dev_err(&dev->interface->dev,
"Can't exchange data if there is no active target");
rc = -EINVAL;
goto error;
}
arg = kmalloc(sizeof(*arg), GFP_KERNEL);
if (!arg) {
rc = -ENOMEM;
goto error;
}
arg->cb = cb;
arg->cb_context = cb_context;
switch (dev->device_type) {
case PN533_DEVICE_PASORI:
if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
skb,
pn533_data_exchange_complete,
arg);
break;
}
default:
/* jumbo frame ? */
if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
rc = pn533_fill_fragment_skbs(dev, skb);
if (rc <= 0)
goto error;
skb = skb_dequeue(&dev->fragment_skb);
if (!skb) {
rc = -EIO;
goto error;
}
} else {
*skb_push(skb, sizeof(u8)) = 1; /* TG */
}
rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
skb, pn533_data_exchange_complete,
arg);
break;
}
if (rc < 0) /* rc from send_async */
goto error;
return 0;
error:
kfree(arg);
dev_kfree_skb(skb);
return rc;
}
static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
u8 status;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (IS_ERR(resp))
return PTR_ERR(resp);
status = resp->data[0];
dev_kfree_skb(resp);
if (status != 0) {
nfc_tm_deactivated(dev->nfc_dev);
dev->tgt_mode = 0;
return 0;
}
queue_work(dev->wq, &dev->tg_work);
return 0;
}
static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
nfc_dev_err(&dev->interface->dev,
"Data length greater than the max allowed: %d",
PN533_CMD_DATAEXCH_DATA_MAXLEN);
return -ENOSYS;
}
rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
pn533_tm_send_complete, NULL);
if (rc < 0)
dev_kfree_skb(skb);
return rc;
}
static void pn533_wq_mi_recv(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
struct sk_buff *skb;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
if (!skb)
goto error;
switch (dev->device_type) {
case PN533_DEVICE_PASORI:
if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
rc = pn533_send_cmd_direct_async(dev,
PN533_CMD_IN_COMM_THRU,
skb,
pn533_data_exchange_complete,
dev->cmd_complete_mi_arg);
break;
}
default:
*skb_put(skb, sizeof(u8)) = 1; /*TG*/
rc = pn533_send_cmd_direct_async(dev,
PN533_CMD_IN_DATA_EXCHANGE,
skb,
pn533_data_exchange_complete,
dev->cmd_complete_mi_arg);
break;
}
if (rc == 0) /* success */
return;
nfc_dev_err(&dev->interface->dev,
"Error %d when trying to perform data_exchange", rc);
dev_kfree_skb(skb);
kfree(dev->cmd_complete_mi_arg);
error:
pn533_send_ack(dev, GFP_KERNEL);
queue_work(dev->wq, &dev->cmd_work);
}
static void pn533_wq_mi_send(struct work_struct *work)
{
struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
struct sk_buff *skb;
int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
/* Grab the first skb in the queue */
skb = skb_dequeue(&dev->fragment_skb);
if (skb == NULL) { /* No more data */
/* Reset the queue for future use */
skb_queue_head_init(&dev->fragment_skb);
goto error;
}
switch (dev->device_type) {
case PN533_DEVICE_PASORI:
if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
rc = -EIO;
break;
}
rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
skb,
pn533_data_exchange_complete,
dev->cmd_complete_dep_arg);
break;
default:
/* Still some fragments? */
rc = pn533_send_cmd_direct_async(dev,PN533_CMD_IN_DATA_EXCHANGE,
skb,
pn533_data_exchange_complete,
dev->cmd_complete_dep_arg);
break;
}
if (rc == 0) /* success */
return;
nfc_dev_err(&dev->interface->dev,
"Error %d when trying to perform data_exchange", rc);
dev_kfree_skb(skb);
kfree(dev->cmd_complete_dep_arg);
error:
pn533_send_ack(dev, GFP_KERNEL);
queue_work(dev->wq, &dev->cmd_work);
}
static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
u8 cfgdata_len)
{
struct sk_buff *skb;
struct sk_buff *resp;
int skb_len;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
skb = pn533_alloc_skb(dev, skb_len);
if (!skb)
return -ENOMEM;
*skb_put(skb, sizeof(cfgitem)) = cfgitem;
memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
if (IS_ERR(resp))
return PTR_ERR(resp);
dev_kfree_skb(resp);
return 0;
}
static int pn533_get_firmware_version(struct pn533 *dev,
struct pn533_fw_version *fv)
{
struct sk_buff *skb;
struct sk_buff *resp;
skb = pn533_alloc_skb(dev, 0);
if (!skb)
return -ENOMEM;
resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
if (IS_ERR(resp))
return PTR_ERR(resp);
fv->ic = resp->data[0];
fv->ver = resp->data[1];
fv->rev = resp->data[2];
fv->support = resp->data[3];
dev_kfree_skb(resp);
return 0;
}
static int pn533_pasori_fw_reset(struct pn533 *dev)
{
struct sk_buff *skb;
struct sk_buff *resp;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(dev, sizeof(u8));
if (!skb)
return -ENOMEM;
*skb_put(skb, sizeof(u8)) = 0x1;
resp = pn533_send_cmd_sync(dev, 0x18, skb);
if (IS_ERR(resp))
return PTR_ERR(resp);
dev_kfree_skb(resp);
return 0;
}
struct pn533_acr122_poweron_rdr_arg {
int rc;
struct completion done;
};
static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
{
struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
nfc_dev_dbg(&urb->dev->dev, "%s", __func__);
print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
urb->transfer_buffer, urb->transfer_buffer_length,
false);
arg->rc = urb->status;
complete(&arg->done);
}
static int pn533_acr122_poweron_rdr(struct pn533 *dev)
{
/* Power on th reader (CCID cmd) */
u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
0, 0, 0, 0, 0, 0, 3, 0, 0};
u8 buf[255];
int rc;
void *cntx;
struct pn533_acr122_poweron_rdr_arg arg;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
init_completion(&arg.done);
cntx = dev->in_urb->context; /* backup context */
dev->in_urb->transfer_buffer = buf;
dev->in_urb->transfer_buffer_length = 255;
dev->in_urb->complete = pn533_acr122_poweron_rdr_resp;
dev->in_urb->context = &arg;
dev->out_urb->transfer_buffer = cmd;
dev->out_urb->transfer_buffer_length = sizeof(cmd);
print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
cmd, sizeof(cmd), false);
rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Reader power on cmd error %d", rc);
return rc;
}
rc = usb_submit_urb(dev->in_urb, GFP_KERNEL);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Can't submit for reader power on cmd response %d",
rc);
return rc;
}
wait_for_completion(&arg.done);
dev->in_urb->context = cntx; /* restore context */
return arg.rc;
}
static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
u8 rf_field = !!rf;
int rc;
rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
(u8 *)&rf_field, 1);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Error on setting RF field");
return rc;
}
return rc;
}
int pn533_dev_up(struct nfc_dev *nfc_dev)
{
return pn533_rf_field(nfc_dev, 1);
}
int pn533_dev_down(struct nfc_dev *nfc_dev)
{
return pn533_rf_field(nfc_dev, 0);
}
static struct nfc_ops pn533_nfc_ops = {
.dev_up = pn533_dev_up,
.dev_down = pn533_dev_down,
.dep_link_up = pn533_dep_link_up,
.dep_link_down = pn533_dep_link_down,
.start_poll = pn533_start_poll,
.stop_poll = pn533_stop_poll,
.activate_target = pn533_activate_target,
.deactivate_target = pn533_deactivate_target,
.im_transceive = pn533_transceive,
.tm_send = pn533_tm_send,
};
static int pn533_setup(struct pn533 *dev)
{
struct pn533_config_max_retries max_retries;
struct pn533_config_timing timing;
u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
int rc;
switch (dev->device_type) {
case PN533_DEVICE_STD:
case PN533_DEVICE_PASORI:
case PN533_DEVICE_ACR122U:
max_retries.mx_rty_atr = 0x2;
max_retries.mx_rty_psl = 0x1;
max_retries.mx_rty_passive_act =
PN533_CONFIG_MAX_RETRIES_NO_RETRY;
timing.rfu = PN533_CONFIG_TIMING_102;
timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
timing.dep_timeout = PN533_CONFIG_TIMING_204;
break;
default:
nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
dev->device_type);
return -EINVAL;
}
rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
(u8 *)&max_retries, sizeof(max_retries));
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Error on setting MAX_RETRIES config");
return rc;
}
rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
(u8 *)&timing, sizeof(timing));
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Error on setting RF timings");
return rc;
}
switch (dev->device_type) {
case PN533_DEVICE_STD:
break;
case PN533_DEVICE_PASORI:
pn533_pasori_fw_reset(dev);
rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
pasori_cfg, 3);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Error while settings PASORI config");
return rc;
}
pn533_pasori_fw_reset(dev);
break;
}
return 0;
}
static int pn533_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct pn533_fw_version fw_ver;
struct pn533 *dev;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
int in_endpoint = 0;
int out_endpoint = 0;
int rc = -ENOMEM;
int i;
u32 protocols;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->udev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
mutex_init(&dev->cmd_lock);
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
in_endpoint = endpoint->bEndpointAddress;
if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
out_endpoint = endpoint->bEndpointAddress;
}
if (!in_endpoint || !out_endpoint) {
nfc_dev_err(&interface->dev,
"Could not find bulk-in or bulk-out endpoint");
rc = -ENODEV;
goto error;
}
dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->in_urb || !dev->out_urb)
goto error;
usb_fill_bulk_urb(dev->in_urb, dev->udev,
usb_rcvbulkpipe(dev->udev, in_endpoint),
NULL, 0, NULL, dev);
usb_fill_bulk_urb(dev->out_urb, dev->udev,
usb_sndbulkpipe(dev->udev, out_endpoint),
NULL, 0, pn533_send_complete, dev);
INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
INIT_WORK(&dev->mi_rx_work, pn533_wq_mi_recv);
INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);
INIT_WORK(&dev->rf_work, pn533_wq_rf);
dev->wq = alloc_ordered_workqueue("pn533", 0);
if (dev->wq == NULL)
goto error;
init_timer(&dev->listen_timer);
dev->listen_timer.data = (unsigned long) dev;
dev->listen_timer.function = pn533_listen_mode_timer;
skb_queue_head_init(&dev->resp_q);
skb_queue_head_init(&dev->fragment_skb);
INIT_LIST_HEAD(&dev->cmd_queue);
usb_set_intfdata(interface, dev);
dev->ops = &pn533_std_frame_ops;
dev->protocol_type = PN533_PROTO_REQ_ACK_RESP;
dev->device_type = id->driver_info;
switch (dev->device_type) {
case PN533_DEVICE_STD:
protocols = PN533_ALL_PROTOCOLS;
break;
case PN533_DEVICE_PASORI:
protocols = PN533_NO_TYPE_B_PROTOCOLS;
break;
case PN533_DEVICE_ACR122U:
protocols = PN533_NO_TYPE_B_PROTOCOLS;
dev->ops = &pn533_acr122_frame_ops;
dev->protocol_type = PN533_PROTO_REQ_RESP,
rc = pn533_acr122_poweron_rdr(dev);
if (rc < 0) {
nfc_dev_err(&dev->interface->dev,
"Couldn't poweron the reader (error %d)",
rc);
goto destroy_wq;
}
break;
default:
nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
dev->device_type);
rc = -EINVAL;
goto destroy_wq;
}
memset(&fw_ver, 0, sizeof(fw_ver));
rc = pn533_get_firmware_version(dev, &fw_ver);
if (rc < 0)
goto destroy_wq;
nfc_dev_info(&dev->interface->dev,
"NXP PN5%02X firmware ver %d.%d now attached",
fw_ver.ic, fw_ver.ver, fw_ver.rev);
dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
dev->ops->tx_header_len +
PN533_CMD_DATAEXCH_HEAD_LEN,
dev->ops->tx_tail_len);
if (!dev->nfc_dev) {
rc = -ENOMEM;
goto destroy_wq;
}
nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
nfc_set_drvdata(dev->nfc_dev, dev);
rc = nfc_register_device(dev->nfc_dev);
if (rc)
goto free_nfc_dev;
rc = pn533_setup(dev);
if (rc)
goto unregister_nfc_dev;
return 0;
unregister_nfc_dev:
nfc_unregister_device(dev->nfc_dev);
free_nfc_dev:
nfc_free_device(dev->nfc_dev);
destroy_wq:
destroy_workqueue(dev->wq);
error:
usb_free_urb(dev->in_urb);
usb_free_urb(dev->out_urb);
usb_put_dev(dev->udev);
kfree(dev);
return rc;
}
static void pn533_disconnect(struct usb_interface *interface)
{
struct pn533 *dev;
struct pn533_cmd *cmd, *n;
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
nfc_unregister_device(dev->nfc_dev);
nfc_free_device(dev->nfc_dev);
usb_kill_urb(dev->in_urb);
usb_kill_urb(dev->out_urb);
flush_delayed_work(&dev->poll_work);
destroy_workqueue(dev->wq);
skb_queue_purge(&dev->resp_q);
del_timer(&dev->listen_timer);
list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
list_del(&cmd->queue);
kfree(cmd);
}
usb_free_urb(dev->in_urb);
usb_free_urb(dev->out_urb);
kfree(dev);
nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
}
static struct usb_driver pn533_driver = {
.name = "pn533",
.probe = pn533_probe,
.disconnect = pn533_disconnect,
.id_table = pn533_table,
};
module_usb_driver(pn533_driver);
MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
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