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OpenCloudOS-Kernel/drivers/nfc/st21nfca/dep.c

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/*
* Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
*
* 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 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, see <http://www.gnu.org/licenses/>.
*/
#include <net/nfc/hci.h>
#include "st21nfca.h"
#define ST21NFCA_NFCIP1_INITIATOR 0x00
#define ST21NFCA_NFCIP1_REQ 0xd4
#define ST21NFCA_NFCIP1_RES 0xd5
#define ST21NFCA_NFCIP1_ATR_REQ 0x00
#define ST21NFCA_NFCIP1_ATR_RES 0x01
#define ST21NFCA_NFCIP1_PSL_REQ 0x04
#define ST21NFCA_NFCIP1_PSL_RES 0x05
#define ST21NFCA_NFCIP1_DEP_REQ 0x06
#define ST21NFCA_NFCIP1_DEP_RES 0x07
#define ST21NFCA_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
#define ST21NFCA_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
#define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
#define ST21NFCA_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
#define ST21NFCA_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
#define ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT 0x10
#define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
#define ST21NFCA_NFC_DEP_PFB_I_PDU 0x00
#define ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU 0x40
#define ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
#define ST21NFCA_ATR_REQ_MIN_SIZE 17
#define ST21NFCA_ATR_REQ_MAX_SIZE 65
#define ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B 0x30
#define ST21NFCA_GB_BIT 0x02
#define ST21NFCA_EVT_SEND_DATA 0x10
#define ST21NFCA_EVT_FIELD_ON 0x11
#define ST21NFCA_EVT_CARD_DEACTIVATED 0x12
#define ST21NFCA_EVT_CARD_ACTIVATED 0x13
#define ST21NFCA_EVT_FIELD_OFF 0x14
#define ST21NFCA_EVT_CARD_F_BITRATE 0x16
#define ST21NFCA_EVT_READER_F_BITRATE 0x13
#define ST21NFCA_PSL_REQ_SEND_SPEED(brs) (brs & 0x38)
#define ST21NFCA_PSL_REQ_RECV_SPEED(brs) (brs & 0x07)
#define ST21NFCA_PP2LRI(pp) ((pp & 0x30) >> 4)
#define ST21NFCA_CARD_BITRATE_212 0x01
#define ST21NFCA_CARD_BITRATE_424 0x02
#define ST21NFCA_DEFAULT_TIMEOUT 0x0a
#define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
__LINE__, req)
struct st21nfca_atr_req {
u8 length;
u8 cmd0;
u8 cmd1;
u8 nfcid3[NFC_NFCID3_MAXSIZE];
u8 did;
u8 bsi;
u8 bri;
u8 ppi;
u8 gbi[0];
} __packed;
struct st21nfca_atr_res {
u8 length;
u8 cmd0;
u8 cmd1;
u8 nfcid3[NFC_NFCID3_MAXSIZE];
u8 did;
u8 bsi;
u8 bri;
u8 to;
u8 ppi;
u8 gbi[0];
} __packed;
struct st21nfca_psl_req {
u8 length;
u8 cmd0;
u8 cmd1;
u8 did;
u8 brs;
u8 fsl;
} __packed;
struct st21nfca_psl_res {
u8 length;
u8 cmd0;
u8 cmd1;
u8 did;
} __packed;
struct st21nfca_dep_req_res {
u8 length;
u8 cmd0;
u8 cmd1;
u8 pfb;
u8 did;
u8 nad;
} __packed;
static void st21nfca_tx_work(struct work_struct *work)
{
struct st21nfca_hci_info *info = container_of(work,
struct st21nfca_hci_info,
dep_info.tx_work);
struct nfc_dev *dev;
struct sk_buff *skb;
if (info) {
dev = info->hdev->ndev;
skb = info->dep_info.tx_pending;
device_lock(&dev->dev);
nfc_hci_send_cmd_async(info->hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_WR_XCHG_DATA, skb->data, skb->len,
info->async_cb, info);
device_unlock(&dev->dev);
kfree_skb(skb);
}
}
static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
struct sk_buff *skb)
{
info->dep_info.tx_pending = skb;
schedule_work(&info->dep_info.tx_work);
}
static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
struct st21nfca_atr_req *atr_req)
{
struct st21nfca_atr_res *atr_res;
struct sk_buff *skb;
size_t gb_len;
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_put(skb, sizeof(struct st21nfca_atr_res));
atr_res = (struct st21nfca_atr_res *)skb->data;
memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
atr_res->length = atr_req->length + 1;
atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
atr_res->bsi = 0x00;
atr_res->bri = 0x00;
atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
if (gb_len) {
skb_put(skb, gb_len);
atr_res->ppi |= ST21NFCA_GB_BIT;
memcpy(atr_res->gbi, atr_req->gbi, gb_len);
r = nfc_set_remote_general_bytes(hdev->ndev, atr_res->gbi,
gb_len);
if (r < 0)
return r;
}
info->dep_info.curr_nfc_dep_pni = 0;
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
kfree_skb(skb);
return r;
}
static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
struct st21nfca_atr_req *atr_req;
size_t gb_len;
int r;
skb_trim(skb, skb->len - 1);
if (!skb->len) {
r = -EIO;
goto exit;
}
if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
r = -EPROTO;
goto exit;
}
atr_req = (struct st21nfca_atr_req *)skb->data;
if (atr_req->length < sizeof(struct st21nfca_atr_req)) {
r = -EPROTO;
goto exit;
}
r = st21nfca_tm_send_atr_res(hdev, atr_req);
if (r)
goto exit;
gb_len = skb->len - sizeof(struct st21nfca_atr_req);
r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
if (r)
goto exit;
r = 0;
exit:
return r;
}
static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
struct st21nfca_psl_req *psl_req)
{
struct st21nfca_psl_res *psl_res;
struct sk_buff *skb;
u8 bitrate[2] = {0, 0};
int r;
skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_put(skb, sizeof(struct st21nfca_psl_res));
psl_res = (struct st21nfca_psl_res *)skb->data;
psl_res->length = sizeof(struct st21nfca_psl_res);
psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
psl_res->did = psl_req->did;
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
if (r < 0)
goto error;
/*
* ST21NFCA only support P2P passive.
* PSL_REQ BRS value != 0 has only a meaning to
* change technology to type F.
* We change to BITRATE 424Kbits.
* In other case switch to BITRATE 106Kbits.
*/
if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
bitrate[0] = ST21NFCA_CARD_BITRATE_424;
bitrate[1] = ST21NFCA_CARD_BITRATE_424;
}
/* Send an event to change bitrate change event to card f */
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
error:
kfree_skb(skb);
return r;
}
static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
struct st21nfca_psl_req *psl_req;
int r;
skb_trim(skb, skb->len - 1);
if (!skb->len) {
r = -EIO;
goto exit;
}
psl_req = (struct st21nfca_psl_req *)skb->data;
if (skb->len < sizeof(struct st21nfca_psl_req)) {
r = -EIO;
goto exit;
}
r = st21nfca_tm_send_psl_res(hdev, psl_req);
exit:
return r;
}
int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
*(u8 *)skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
*(u8 *)skb_push(skb, 1) = skb->len;
r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
kfree_skb(skb);
return r;
}
EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
struct st21nfca_dep_req_res *dep_req;
u8 size;
int r;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
skb_trim(skb, skb->len - 1);
size = 4;
dep_req = (struct st21nfca_dep_req_res *)skb->data;
if (skb->len < size) {
r = -EIO;
goto exit;
}
if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
size++;
if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
size++;
if (skb->len < size) {
r = -EIO;
goto exit;
}
/* Receiving DEP_REQ - Decoding */
switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
case ST21NFCA_NFC_DEP_PFB_I_PDU:
info->dep_info.curr_nfc_dep_pni =
ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
break;
case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
pr_err("Received a ACK/NACK PDU\n");
break;
case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
pr_err("Received a SUPERVISOR PDU\n");
break;
}
skb_pull(skb, size);
return nfc_tm_data_received(hdev->ndev, skb);
exit:
return r;
}
static int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev,
struct sk_buff *skb)
{
u8 cmd0, cmd1;
int r;
cmd0 = skb->data[1];
switch (cmd0) {
case ST21NFCA_NFCIP1_REQ:
cmd1 = skb->data[2];
switch (cmd1) {
case ST21NFCA_NFCIP1_ATR_REQ:
r = st21nfca_tm_recv_atr_req(hdev, skb);
break;
case ST21NFCA_NFCIP1_PSL_REQ:
r = st21nfca_tm_recv_psl_req(hdev, skb);
break;
case ST21NFCA_NFCIP1_DEP_REQ:
r = st21nfca_tm_recv_dep_req(hdev, skb);
break;
default:
return 1;
}
default:
return 1;
}
return r;
}
/*
* Returns:
* <= 0: driver handled the event, skb consumed
* 1: driver does not handle the event, please do standard processing
*/
int st21nfca_dep_event_received(struct nfc_hci_dev *hdev,
u8 event, struct sk_buff *skb)
{
int r = 0;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
pr_debug("dep event: %d\n", event);
switch (event) {
case ST21NFCA_EVT_CARD_ACTIVATED:
info->dep_info.curr_nfc_dep_pni = 0;
break;
case ST21NFCA_EVT_CARD_DEACTIVATED:
break;
case ST21NFCA_EVT_FIELD_ON:
break;
case ST21NFCA_EVT_FIELD_OFF:
break;
case ST21NFCA_EVT_SEND_DATA:
r = st21nfca_tm_event_send_data(hdev, skb);
if (r < 0)
return r;
return 0;
default:
nfc_err(&hdev->ndev->dev, "Unexpected event on card f gate\n");
return 1;
}
kfree_skb(skb);
return r;
}
EXPORT_SYMBOL(st21nfca_dep_event_received);
static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
u8 bri, u8 lri)
{
struct sk_buff *skb;
struct st21nfca_psl_req *psl_req;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
skb =
alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
if (!skb)
return;
skb_reserve(skb, 1);
skb_put(skb, sizeof(struct st21nfca_psl_req));
psl_req = (struct st21nfca_psl_req *) skb->data;
psl_req->length = sizeof(struct st21nfca_psl_req);
psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
psl_req->did = did;
psl_req->brs = (0x30 & bsi << 4) | (bri & 0x03);
psl_req->fsl = lri;
*(u8 *)skb_push(skb, 1) = info->dep_info.to | 0x10;
st21nfca_im_send_pdu(info, skb);
}
#define ST21NFCA_CB_TYPE_READER_F 1
static void st21nfca_im_recv_atr_res_cb(void *context, struct sk_buff *skb,
int err)
{
struct st21nfca_hci_info *info = context;
struct st21nfca_atr_res *atr_res;
int r;
if (err != 0)
return;
if (!skb)
return;
switch (info->async_cb_type) {
case ST21NFCA_CB_TYPE_READER_F:
skb_trim(skb, skb->len - 1);
atr_res = (struct st21nfca_atr_res *)skb->data;
r = nfc_set_remote_general_bytes(info->hdev->ndev,
atr_res->gbi,
skb->len - sizeof(struct st21nfca_atr_res));
if (r < 0)
return;
if (atr_res->to >= 0x0e)
info->dep_info.to = 0x0e;
else
info->dep_info.to = atr_res->to + 1;
info->dep_info.to |= 0x10;
r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
if (r < 0)
return;
info->dep_info.curr_nfc_dep_pni = 0;
if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
st21nfca_im_send_psl_req(info->hdev, atr_res->did,
atr_res->bsi, atr_res->bri,
ST21NFCA_PP2LRI(atr_res->ppi));
break;
default:
kfree_skb(skb);
break;
}
}
int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len)
{
struct sk_buff *skb;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
struct st21nfca_atr_req *atr_req;
struct nfc_target *target;
uint size;
info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
PROTOCOL_ERR("14.6.1.1");
return -EINVAL;
}
skb =
alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, 1);
skb_put(skb, sizeof(struct st21nfca_atr_req));
atr_req = (struct st21nfca_atr_req *)skb->data;
memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
target = hdev->ndev->targets;
if (target->sensf_res_len > 0)
memcpy(atr_req->nfcid3, target->sensf_res,
target->sensf_res_len);
else
get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
atr_req->did = 0x0;
atr_req->bsi = 0x00;
atr_req->bri = 0x00;
atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
if (gb_len) {
atr_req->ppi |= ST21NFCA_GB_BIT;
skb_put_data(skb, gb, gb_len);
}
atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
*(u8 *)skb_push(skb, 1) = info->dep_info.to | 0x10; /* timeout */
info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
info->async_cb_context = info;
info->async_cb = st21nfca_im_recv_atr_res_cb;
info->dep_info.bri = atr_req->bri;
info->dep_info.bsi = atr_req->bsi;
info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_WR_XCHG_DATA, skb->data,
skb->len, info->async_cb, info);
}
EXPORT_SYMBOL(st21nfca_im_send_atr_req);
static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
int err)
{
struct st21nfca_hci_info *info = context;
struct st21nfca_dep_req_res *dep_res;
int size;
if (err != 0)
return;
if (!skb)
return;
switch (info->async_cb_type) {
case ST21NFCA_CB_TYPE_READER_F:
dep_res = (struct st21nfca_dep_req_res *)skb->data;
size = 3;
if (skb->len < size)
goto exit;
if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
size++;
if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
size++;
if (skb->len < size)
goto exit;
skb_trim(skb, skb->len - 1);
/* Receiving DEP_REQ - Decoding */
switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
pr_err("Received a ACK/NACK PDU\n");
case ST21NFCA_NFC_DEP_PFB_I_PDU:
info->dep_info.curr_nfc_dep_pni =
ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
size++;
skb_pull(skb, size);
nfc_tm_data_received(info->hdev->ndev, skb);
break;
case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
pr_err("Received a SUPERVISOR PDU\n");
skb_pull(skb, size);
*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
*(u8 *)skb_push(skb, 1) = skb->len;
*(u8 *)skb_push(skb, 1) = info->dep_info.to | 0x10;
st21nfca_im_send_pdu(info, skb);
break;
}
return;
default:
break;
}
exit:
kfree_skb(skb);
}
int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
info->async_cb_context = info;
info->async_cb = st21nfca_im_recv_dep_res_cb;
*(u8 *)skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
*(u8 *)skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
*(u8 *)skb_push(skb, 1) = skb->len;
*(u8 *)skb_push(skb, 1) = info->dep_info.to | 0x10;
return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
ST21NFCA_WR_XCHG_DATA,
skb->data, skb->len,
info->async_cb, info);
}
EXPORT_SYMBOL(st21nfca_im_send_dep_req);
void st21nfca_dep_init(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
info->dep_info.curr_nfc_dep_pni = 0;
info->dep_info.idx = 0;
info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
}
EXPORT_SYMBOL(st21nfca_dep_init);
void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
cancel_work_sync(&info->dep_info.tx_work);
}
EXPORT_SYMBOL(st21nfca_dep_deinit);
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