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linux-sg2042/net/nfc/nci/hci.c

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/*
* The NFC Controller Interface is the communication protocol between an
* NFC Controller (NFCC) and a Device Host (DH).
* This is the HCI over NCI implementation, as specified in the 10.2
* section of the NCI 1.1 specification.
*
* Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms 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 <linux/skbuff.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
struct nci_data {
u8 conn_id;
u8 pipe;
u8 cmd;
const u8 *data;
u32 data_len;
} __packed;
struct nci_hci_create_pipe_params {
u8 src_gate;
u8 dest_host;
u8 dest_gate;
} __packed;
struct nci_hci_create_pipe_resp {
u8 src_host;
u8 src_gate;
u8 dest_host;
u8 dest_gate;
u8 pipe;
} __packed;
struct nci_hci_delete_pipe_noti {
u8 pipe;
} __packed;
struct nci_hci_all_pipe_cleared_noti {
u8 host;
} __packed;
struct nci_hcp_message {
u8 header; /* type -cmd,evt,rsp- + instruction */
u8 data[];
} __packed;
struct nci_hcp_packet {
u8 header; /* cbit+pipe */
struct nci_hcp_message message;
} __packed;
#define NCI_HCI_ANY_SET_PARAMETER 0x01
#define NCI_HCI_ANY_GET_PARAMETER 0x02
#define NCI_HCI_ANY_CLOSE_PIPE 0x04
#define NCI_HFP_NO_CHAINING 0x80
#define NCI_NFCEE_ID_HCI 0x80
#define NCI_EVT_HOT_PLUG 0x03
#define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01
/* HCP headers */
#define NCI_HCI_HCP_PACKET_HEADER_LEN 1
#define NCI_HCI_HCP_MESSAGE_HEADER_LEN 1
#define NCI_HCI_HCP_HEADER_LEN 2
/* HCP types */
#define NCI_HCI_HCP_COMMAND 0x00
#define NCI_HCI_HCP_EVENT 0x01
#define NCI_HCI_HCP_RESPONSE 0x02
#define NCI_HCI_ADM_NOTIFY_PIPE_CREATED 0x12
#define NCI_HCI_ADM_NOTIFY_PIPE_DELETED 0x13
#define NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
#define NCI_HCI_FRAGMENT 0x7f
#define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
((instr) & 0x3f))
#define NCI_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
#define NCI_HCP_MSG_GET_CMD(header) (header & 0x3f)
#define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
/* HCI core */
static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
{
int i;
for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
hdev->pipes[i].gate = NCI_HCI_INVALID_GATE;
hdev->pipes[i].host = NCI_HCI_INVALID_HOST;
}
memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
}
static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
{
int i;
for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
if (ndev->hci_dev->pipes[i].host == host) {
ndev->hci_dev->pipes[i].gate = NCI_HCI_INVALID_GATE;
ndev->hci_dev->pipes[i].host = NCI_HCI_INVALID_HOST;
}
}
}
/* Fragment HCI data over NCI packet.
* NFC Forum NCI 10.2.2 Data Exchange:
* The payload of the Data Packets sent on the Logical Connection SHALL be
* valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL
* contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be
* applied to Data Messages in either direction. The HCI fragmentation mechanism
* is used if required.
*/
static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
const u8 data_type, const u8 *data,
size_t data_len)
{
struct nci_conn_info *conn_info;
struct sk_buff *skb;
int len, i, r;
u8 cb = pipe;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info)
return -EPROTO;
skb = nci_skb_alloc(ndev, 2 + conn_info->max_pkt_payload_len +
NCI_DATA_HDR_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, 2 + NCI_DATA_HDR_SIZE);
*skb_push(skb, 1) = data_type;
i = 0;
len = conn_info->max_pkt_payload_len;
do {
/* If last packet add NCI_HFP_NO_CHAINING */
if (i + conn_info->max_pkt_payload_len -
(skb->len + 1) >= data_len) {
cb |= NCI_HFP_NO_CHAINING;
len = data_len - i;
} else {
len = conn_info->max_pkt_payload_len - skb->len - 1;
}
*skb_push(skb, 1) = cb;
if (len > 0)
memcpy(skb_put(skb, len), data + i, len);
r = nci_send_data(ndev, conn_info->conn_id, skb);
if (r < 0)
return r;
i += len;
if (i < data_len) {
skb_trim(skb, 0);
skb_pull(skb, len);
}
} while (i < data_len);
return i;
}
static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
{
struct nci_data *data = (struct nci_data *)opt;
nci_hci_send_data(ndev, data->pipe, data->cmd,
data->data, data->data_len);
}
int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
const u8 *param, size_t param_len)
{
u8 pipe = ndev->hci_dev->gate2pipe[gate];
if (pipe == NCI_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
return nci_hci_send_data(ndev, pipe,
NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
param, param_len);
}
EXPORT_SYMBOL(nci_hci_send_event);
int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
const u8 *param, size_t param_len,
struct sk_buff **skb)
{
struct nci_conn_info *conn_info;
struct nci_data data;
int r;
u8 pipe = ndev->hci_dev->gate2pipe[gate];
if (pipe == NCI_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info)
return -EPROTO;
data.conn_id = conn_info->conn_id;
data.pipe = pipe;
data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
data.data = param;
data.data_len = param_len;
r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
if (r == NCI_STATUS_OK)
*skb = conn_info->rx_skb;
return r;
}
EXPORT_SYMBOL(nci_hci_send_cmd);
static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
u8 event, struct sk_buff *skb)
{
if (ndev->ops->hci_event_received)
ndev->ops->hci_event_received(ndev, pipe, event, skb);
}
static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
u8 cmd, struct sk_buff *skb)
{
u8 gate = ndev->hci_dev->pipes[pipe].gate;
u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
u8 dest_gate, new_pipe;
struct nci_hci_create_pipe_resp *create_info;
struct nci_hci_delete_pipe_noti *delete_info;
struct nci_hci_all_pipe_cleared_noti *cleared_info;
pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
switch (cmd) {
case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
if (skb->len != 5) {
status = NCI_HCI_ANY_E_NOK;
goto exit;
}
create_info = (struct nci_hci_create_pipe_resp *)skb->data;
dest_gate = create_info->dest_gate;
new_pipe = create_info->pipe;
/* Save the new created pipe and bind with local gate,
* the description for skb->data[3] is destination gate id
* but since we received this cmd from host controller, we
* are the destination and it is our local gate
*/
ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
ndev->hci_dev->pipes[new_pipe].host =
create_info->src_host;
break;
case NCI_HCI_ANY_OPEN_PIPE:
/* If the pipe is not created report an error */
if (gate == NCI_HCI_INVALID_GATE) {
status = NCI_HCI_ANY_E_NOK;
goto exit;
}
break;
case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
if (skb->len != 1) {
status = NCI_HCI_ANY_E_NOK;
goto exit;
}
delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
ndev->hci_dev->pipes[delete_info->pipe].gate =
NCI_HCI_INVALID_GATE;
ndev->hci_dev->pipes[delete_info->pipe].host =
NCI_HCI_INVALID_HOST;
break;
case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
if (skb->len != 1) {
status = NCI_HCI_ANY_E_NOK;
goto exit;
}
cleared_info =
(struct nci_hci_all_pipe_cleared_noti *)skb->data;
nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
break;
default:
pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
break;
}
if (ndev->ops->hci_cmd_received)
ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
exit:
nci_hci_send_data(ndev, pipe, status, NULL, 0);
kfree_skb(skb);
}
static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
u8 result, struct sk_buff *skb)
{
struct nci_conn_info *conn_info;
u8 status = result;
if (result != NCI_HCI_ANY_OK)
goto exit;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info) {
status = NCI_STATUS_REJECTED;
goto exit;
}
conn_info->rx_skb = skb;
exit:
nci_req_complete(ndev, status);
}
/* Receive hcp message for pipe, with type and cmd.
* skb contains optional message data only.
*/
static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
u8 type, u8 instruction, struct sk_buff *skb)
{
switch (type) {
case NCI_HCI_HCP_RESPONSE:
nci_hci_resp_received(ndev, pipe, instruction, skb);
break;
case NCI_HCI_HCP_COMMAND:
nci_hci_cmd_received(ndev, pipe, instruction, skb);
break;
case NCI_HCI_HCP_EVENT:
nci_hci_event_received(ndev, pipe, instruction, skb);
break;
default:
pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
type, instruction);
kfree_skb(skb);
break;
}
nci_req_complete(ndev, 0);
}
static void nci_hci_msg_rx_work(struct work_struct *work)
{
struct nci_hci_dev *hdev =
container_of(work, struct nci_hci_dev, msg_rx_work);
struct sk_buff *skb;
struct nci_hcp_message *message;
u8 pipe, type, instruction;
while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
pipe = skb->data[0];
skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
message = (struct nci_hcp_message *)skb->data;
type = NCI_HCP_MSG_GET_TYPE(message->header);
instruction = NCI_HCP_MSG_GET_CMD(message->header);
skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
nci_hci_hcp_message_rx(hdev->ndev, pipe,
type, instruction, skb);
}
}
void nci_hci_data_received_cb(void *context,
struct sk_buff *skb, int err)
{
struct nci_dev *ndev = (struct nci_dev *)context;
struct nci_hcp_packet *packet;
u8 pipe, type, instruction;
struct sk_buff *hcp_skb;
struct sk_buff *frag_skb;
int msg_len;
pr_debug("\n");
if (err) {
nci_req_complete(ndev, err);
return;
}
packet = (struct nci_hcp_packet *)skb->data;
if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
return;
}
/* it's the last fragment. Does it need re-aggregation? */
if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
pipe = packet->header & NCI_HCI_FRAGMENT;
skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
msg_len = 0;
skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
msg_len += (frag_skb->len -
NCI_HCI_HCP_PACKET_HEADER_LEN);
}
hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
msg_len, GFP_KERNEL);
if (!hcp_skb) {
nci_req_complete(ndev, -ENOMEM);
return;
}
*skb_put(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN) = pipe;
skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
memcpy(skb_put(hcp_skb, msg_len), frag_skb->data +
NCI_HCI_HCP_PACKET_HEADER_LEN, msg_len);
}
skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
} else {
packet->header &= NCI_HCI_FRAGMENT;
hcp_skb = skb;
}
/* if this is a response, dispatch immediately to
* unblock waiting cmd context. Otherwise, enqueue to dispatch
* in separate context where handler can also execute command.
*/
packet = (struct nci_hcp_packet *)hcp_skb->data;
type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
if (type == NCI_HCI_HCP_RESPONSE) {
pipe = packet->header;
instruction = NCI_HCP_MSG_GET_CMD(packet->message.header);
skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN +
NCI_HCI_HCP_MESSAGE_HEADER_LEN);
nci_hci_hcp_message_rx(ndev, pipe, type, instruction, hcp_skb);
} else {
skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
schedule_work(&ndev->hci_dev->msg_rx_work);
}
}
int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
{
struct nci_data data;
struct nci_conn_info *conn_info;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info)
return -EPROTO;
data.conn_id = conn_info->conn_id;
data.pipe = pipe;
data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
NCI_HCI_ANY_OPEN_PIPE);
data.data = NULL;
data.data_len = 0;
return nci_request(ndev, nci_hci_send_data_req,
(unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
}
EXPORT_SYMBOL(nci_hci_open_pipe);
int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
const u8 *param, size_t param_len)
{
struct nci_conn_info *conn_info;
struct nci_data data;
int r;
u8 *tmp;
u8 pipe = ndev->hci_dev->gate2pipe[gate];
pr_debug("idx=%d to gate %d\n", idx, gate);
if (pipe == NCI_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info)
return -EPROTO;
tmp = kmalloc(1 + param_len, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
*tmp = idx;
memcpy(tmp + 1, param, param_len);
data.conn_id = conn_info->conn_id;
data.pipe = pipe;
data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
NCI_HCI_ANY_SET_PARAMETER);
data.data = tmp;
data.data_len = param_len + 1;
r = nci_request(ndev, nci_hci_send_data_req,
(unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
kfree(tmp);
return r;
}
EXPORT_SYMBOL(nci_hci_set_param);
int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
struct sk_buff **skb)
{
struct nci_conn_info *conn_info;
struct nci_data data;
int r;
u8 pipe = ndev->hci_dev->gate2pipe[gate];
pr_debug("idx=%d to gate %d\n", idx, gate);
if (pipe == NCI_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info)
return -EPROTO;
data.conn_id = conn_info->conn_id;
data.pipe = pipe;
data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
NCI_HCI_ANY_GET_PARAMETER);
data.data = &idx;
data.data_len = 1;
r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
if (r == NCI_STATUS_OK)
*skb = conn_info->rx_skb;
return r;
}
EXPORT_SYMBOL(nci_hci_get_param);
int nci_hci_connect_gate(struct nci_dev *ndev,
u8 dest_host, u8 dest_gate, u8 pipe)
{
int r;
if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
return 0;
if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
return -EADDRINUSE;
if (pipe != NCI_HCI_INVALID_PIPE)
goto open_pipe;
switch (dest_gate) {
case NCI_HCI_LINK_MGMT_GATE:
pipe = NCI_HCI_LINK_MGMT_PIPE;
break;
case NCI_HCI_ADMIN_GATE:
pipe = NCI_HCI_ADMIN_PIPE;
break;
}
open_pipe:
r = nci_hci_open_pipe(ndev, pipe);
if (r < 0)
return r;
ndev->hci_dev->pipes[pipe].gate = dest_gate;
ndev->hci_dev->pipes[pipe].host = dest_host;
ndev->hci_dev->gate2pipe[dest_gate] = pipe;
return 0;
}
EXPORT_SYMBOL(nci_hci_connect_gate);
static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
u8 gate_count,
struct nci_hci_gate *gates)
{
int r;
while (gate_count--) {
r = nci_hci_connect_gate(ndev, gates->dest_host,
gates->gate, gates->pipe);
if (r < 0)
return r;
gates++;
}
return 0;
}
int nci_hci_dev_session_init(struct nci_dev *ndev)
{
struct nci_conn_info *conn_info;
struct sk_buff *skb;
int r;
ndev->hci_dev->count_pipes = 0;
ndev->hci_dev->expected_pipes = 0;
conn_info = ndev->hci_dev->conn_info;
if (!conn_info)
return -EPROTO;
conn_info->data_exchange_cb = nci_hci_data_received_cb;
conn_info->data_exchange_cb_context = ndev;
nci_hci_reset_pipes(ndev->hci_dev);
if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
return -EPROTO;
r = nci_hci_connect_gate(ndev,
ndev->hci_dev->init_data.gates[0].dest_host,
ndev->hci_dev->init_data.gates[0].gate,
ndev->hci_dev->init_data.gates[0].pipe);
if (r < 0)
goto exit;
r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
if (r < 0)
goto exit;
if (skb->len &&
skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
memcmp(ndev->hci_dev->init_data.session_id,
skb->data, skb->len) == 0 &&
ndev->ops->hci_load_session) {
/* Restore gate<->pipe table from some proprietary location. */
r = ndev->ops->hci_load_session(ndev);
if (r < 0)
goto exit;
} else {
r = nci_hci_dev_connect_gates(ndev,
ndev->hci_dev->init_data.gate_count,
ndev->hci_dev->init_data.gates);
if (r < 0)
goto exit;
r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
ndev->hci_dev->init_data.session_id,
strlen(ndev->hci_dev->init_data.session_id));
}
if (r == 0)
goto exit;
exit:
kfree_skb(skb);
return r;
}
EXPORT_SYMBOL(nci_hci_dev_session_init);
struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
{
struct nci_hci_dev *hdev;
hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
if (!hdev)
return NULL;
skb_queue_head_init(&hdev->rx_hcp_frags);
INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
skb_queue_head_init(&hdev->msg_rx_queue);
hdev->ndev = ndev;
return hdev;
}
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