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NFC: HCI support

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This is an implementation of ETSI TS 102 622 specification.
Many NFC chipsets use HCI as the host <-> target protocol on top of a
serial link like i2c.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Eric Lapuyade 2012-04-10 19:43:06 +02:00 committed by John W. Linville
parent e1da0efa2e
commit 8b8d2e08bf
10 changed files with 1695 additions and 0 deletions
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198
include/net/nfc/hci.h Normal file
View File

@ -0,0 +1,198 @@
/*
* Copyright (C) 2011 Intel Corporation. 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 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.
*/
#ifndef __NET_HCI_H
#define __NET_HCI_H
#include <linux/skbuff.h>
#include <net/nfc/nfc.h>
struct nfc_hci_dev;
struct nfc_hci_ops {
int (*open) (struct nfc_hci_dev *hdev);
void (*close) (struct nfc_hci_dev *hdev);
int (*hci_ready) (struct nfc_hci_dev *hdev);
int (*xmit) (struct nfc_hci_dev *hdev, struct sk_buff *skb);
int (*start_poll) (struct nfc_hci_dev *hdev, u32 protocols);
int (*target_from_gate) (struct nfc_hci_dev *hdev, u8 gate,
struct nfc_target *target);
int (*complete_target_discovered) (struct nfc_hci_dev *hdev, u8 gate,
struct nfc_target *target);
int (*data_exchange) (struct nfc_hci_dev *hdev,
struct nfc_target *target,
struct sk_buff *skb, struct sk_buff **res_skb);
};
#define NFC_HCI_MAX_CUSTOM_GATES 15
struct nfc_hci_init_data {
u8 gate_count;
u8 gates[NFC_HCI_MAX_CUSTOM_GATES];
char session_id[9];
};
typedef int (*xmit) (struct sk_buff *skb, void *cb_data);
#define NFC_HCI_MAX_GATES 256
struct nfc_hci_dev {
struct nfc_dev *ndev;
u32 max_data_link_payload;
struct mutex msg_tx_mutex;
struct list_head msg_tx_queue;
struct workqueue_struct *msg_tx_wq;
struct work_struct msg_tx_work;
struct timer_list cmd_timer;
struct hci_msg *cmd_pending_msg;
struct sk_buff_head rx_hcp_frags;
struct workqueue_struct *msg_rx_wq;
struct work_struct msg_rx_work;
struct sk_buff_head msg_rx_queue;
struct nfc_hci_ops *ops;
struct nfc_hci_init_data init_data;
void *clientdata;
u8 gate2pipe[NFC_HCI_MAX_GATES];
bool poll_started;
struct nfc_target *targets;
int target_count;
u8 sw_romlib;
u8 sw_patch;
u8 sw_flashlib_major;
u8 sw_flashlib_minor;
u8 hw_derivative;
u8 hw_version;
u8 hw_mpw;
u8 hw_software;
u8 hw_bsid;
};
/* hci device allocation */
struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
struct nfc_hci_init_data *init_data,
u32 protocols,
int tx_headroom,
int tx_tailroom,
int max_link_payload);
void nfc_hci_free_device(struct nfc_hci_dev *hdev);
int nfc_hci_register_device(struct nfc_hci_dev *hdev);
void nfc_hci_unregister_device(struct nfc_hci_dev *hdev);
void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata);
void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev);
/* Host IDs */
#define NFC_HCI_HOST_CONTROLLER_ID 0x00
#define NFC_HCI_TERMINAL_HOST_ID 0x01
#define NFC_HCI_UICC_HOST_ID 0x02
/* Host Controller Gates and registry indexes */
#define NFC_HCI_ADMIN_GATE 0x00
#define NFC_HCI_ADMIN_SESSION_IDENTITY 0x01
#define NFC_HCI_ADMIN_MAX_PIPE 0x02
#define NFC_HCI_ADMIN_WHITELIST 0x03
#define NFC_HCI_ADMIN_HOST_LIST 0x04
#define NFC_HCI_LOOPBACK_GATE 0x04
#define NFC_HCI_ID_MGMT_GATE 0x05
#define NFC_HCI_ID_MGMT_VERSION_SW 0x01
#define NFC_HCI_ID_MGMT_VERSION_HW 0x03
#define NFC_HCI_ID_MGMT_VENDOR_NAME 0x04
#define NFC_HCI_ID_MGMT_MODEL_ID 0x05
#define NFC_HCI_ID_MGMT_HCI_VERSION 0x02
#define NFC_HCI_ID_MGMT_GATES_LIST 0x06
#define NFC_HCI_LINK_MGMT_GATE 0x06
#define NFC_HCI_LINK_MGMT_REC_ERROR 0x01
#define NFC_HCI_RF_READER_B_GATE 0x11
#define NFC_HCI_RF_READER_B_PUPI 0x03
#define NFC_HCI_RF_READER_B_APPLICATION_DATA 0x04
#define NFC_HCI_RF_READER_B_AFI 0x02
#define NFC_HCI_RF_READER_B_HIGHER_LAYER_RESPONSE 0x01
#define NFC_HCI_RF_READER_B_HIGHER_LAYER_DATA 0x05
#define NFC_HCI_RF_READER_A_GATE 0x13
#define NFC_HCI_RF_READER_A_UID 0x02
#define NFC_HCI_RF_READER_A_ATQA 0x04
#define NFC_HCI_RF_READER_A_APPLICATION_DATA 0x05
#define NFC_HCI_RF_READER_A_SAK 0x03
#define NFC_HCI_RF_READER_A_FWI_SFGT 0x06
#define NFC_HCI_RF_READER_A_DATARATE_MAX 0x01
#define NFC_HCI_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
#define NFC_HCI_TYPE_A_SEL_PROT_MIFARE 0
#define NFC_HCI_TYPE_A_SEL_PROT_ISO14443 1
#define NFC_HCI_TYPE_A_SEL_PROT_DEP 2
#define NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP 3
/* Generic events */
#define NFC_HCI_EVT_HCI_END_OF_OPERATION 0x01
#define NFC_HCI_EVT_POST_DATA 0x02
#define NFC_HCI_EVT_HOT_PLUG 0x03
/* Reader RF gates events */
#define NFC_HCI_EVT_READER_REQUESTED 0x10
#define NFC_HCI_EVT_END_OPERATION 0x11
/* Reader Application gate events */
#define NFC_HCI_EVT_TARGET_DISCOVERED 0x10
/* receiving messages from lower layer */
void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
struct sk_buff *skb);
void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
struct sk_buff *skb);
void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
struct sk_buff *skb);
void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb);
/* connecting to gates and sending hci instructions */
int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate);
int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate);
int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev);
int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
struct sk_buff **skb);
int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
const u8 *param, size_t param_len);
int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
const u8 *param, size_t param_len, struct sk_buff **skb);
int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response,
const u8 *param, size_t param_len);
int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
const u8 *param, size_t param_len);
#endif /* __NET_HCI_H */

1
include/net/nfc/nfc.h
View File

@ -78,6 +78,7 @@ struct nfc_target {
u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
u8 sensf_res_len;
u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
u8 hci_reader_gate;
};
struct nfc_genl_data {

1
net/nfc/Kconfig
View File

@ -14,6 +14,7 @@ menuconfig NFC
be called nfc.
source "net/nfc/nci/Kconfig"
source "net/nfc/hci/Kconfig"
source "net/nfc/llcp/Kconfig"
source "drivers/nfc/Kconfig"

1
net/nfc/Makefile
View File

@ -4,6 +4,7 @@
obj-$(CONFIG_NFC) += nfc.o
obj-$(CONFIG_NFC_NCI) += nci/
obj-$(CONFIG_NFC_HCI) += hci/
nfc-objs := core.o netlink.o af_nfc.o rawsock.o
nfc-$(CONFIG_NFC_LLCP) += llcp/llcp.o llcp/commands.o llcp/sock.o

8
net/nfc/hci/Kconfig Normal file
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@ -0,0 +1,8 @@
config NFC_HCI
depends on NFC
tristate "NFC HCI implementation"
default n
help
Say Y here if you want to build support for a kernel NFC HCI
implementation. This is mostly needed for devices that only process
HCI frames, like for example the NXP pn544.

7
net/nfc/hci/Makefile Normal file
View File

@ -0,0 +1,7 @@
#
# Makefile for the Linux NFC HCI layer.
#
obj-$(CONFIG_NFC_HCI) += hci.o
hci-y := core.o hcp.o command.o

354
net/nfc/hci/command.c Normal file
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@ -0,0 +1,354 @@
/*
* Copyright (C) 2012 Intel Corporation. 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 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.
*/
#define pr_fmt(fmt) "hci: %s: " fmt, __func__
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <net/nfc/hci.h>
#include "hci.h"
static int nfc_hci_result_to_errno(u8 result)
{
switch (result) {
case NFC_HCI_ANY_OK:
return 0;
case NFC_HCI_ANY_E_TIMEOUT:
return -ETIMEDOUT;
default:
return -1;
}
}
static void nfc_hci_execute_cb(struct nfc_hci_dev *hdev, u8 result,
struct sk_buff *skb, void *cb_data)
{
struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)cb_data;
pr_debug("HCI Cmd completed with HCI result=%d\n", result);
hcp_ew->exec_result = nfc_hci_result_to_errno(result);
if (hcp_ew->exec_result == 0)
hcp_ew->result_skb = skb;
else
kfree_skb(skb);
hcp_ew->exec_complete = true;
wake_up(hcp_ew->wq);
}
static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
const u8 *param, size_t param_len,
struct sk_buff **skb)
{
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
struct hcp_exec_waiter hcp_ew;
hcp_ew.wq = &ew_wq;
hcp_ew.exec_complete = false;
hcp_ew.result_skb = NULL;
pr_debug("through pipe=%d, cmd=%d, plen=%zd\n", pipe, cmd, param_len);
/* TODO: Define hci cmd execution delay. Should it be the same
* for all commands?
*/
hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
NFC_HCI_HCP_COMMAND, cmd,
param, param_len,
nfc_hci_execute_cb, &hcp_ew,
3000);
if (hcp_ew.exec_result < 0)
return hcp_ew.exec_result;
wait_event(ew_wq, hcp_ew.exec_complete == true);
if (hcp_ew.exec_result == 0) {
if (skb)
*skb = hcp_ew.result_skb;
else
kfree_skb(hcp_ew.result_skb);
}
return hcp_ew.exec_result;
}
int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
const u8 *param, size_t param_len)
{
u8 pipe;
pr_debug("%d to gate %d\n", event, gate);
pipe = hdev->gate2pipe[gate];
if (pipe == NFC_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
param, param_len, NULL, NULL, 0);
}
EXPORT_SYMBOL(nfc_hci_send_event);
int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response,
const u8 *param, size_t param_len)
{
u8 pipe;
pr_debug("\n");
pipe = hdev->gate2pipe[gate];
if (pipe == NFC_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
response, param, param_len, NULL, NULL,
0);
}
EXPORT_SYMBOL(nfc_hci_send_response);
/*
* Execute an hci command sent to gate.
* skb will contain response data if success. skb can be NULL if you are not
* interested by the response.
*/
int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
const u8 *param, size_t param_len, struct sk_buff **skb)
{
u8 pipe;
pr_debug("\n");
pipe = hdev->gate2pipe[gate];
if (pipe == NFC_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
}
EXPORT_SYMBOL(nfc_hci_send_cmd);
int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
const u8 *param, size_t param_len)
{
int r;
u8 *tmp;
/* TODO ELa: reg idx must be inserted before param, but we don't want
* to ask the caller to do it to keep a simpler API.
* For now, just create a new temporary param buffer. This is far from
* optimal though, and the plan is to modify APIs to pass idx down to
* nfc_hci_hcp_message_tx where the frame is actually built, thereby
* eliminating the need for the temp allocation-copy here.
*/
pr_debug("idx=%d to gate %d\n", idx, gate);
tmp = kmalloc(1 + param_len, GFP_KERNEL);
if (tmp == NULL)
return -ENOMEM;
*tmp = idx;
memcpy(tmp + 1, param, param_len);
r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
tmp, param_len + 1, NULL);
kfree(tmp);
return r;
}
EXPORT_SYMBOL(nfc_hci_set_param);
int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
struct sk_buff **skb)
{
pr_debug("gate=%d regidx=%d\n", gate, idx);
return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
&idx, 1, skb);
}
EXPORT_SYMBOL(nfc_hci_get_param);
static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
{
struct sk_buff *skb;
int r;
pr_debug("pipe=%d\n", pipe);
r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
NULL, 0, &skb);
if (r == 0) {
/* dest host other than host controller will send
* number of pipes already open on this gate before
* execution. The number can be found in skb->data[0]
*/
kfree_skb(skb);
}
return r;
}
static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
{
pr_debug("\n");
return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
NULL, 0, NULL);
}
static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
u8 dest_gate, int *result)
{
struct sk_buff *skb;
struct hci_create_pipe_params params;
struct hci_create_pipe_resp *resp;
u8 pipe;
pr_debug("gate=%d\n", dest_gate);
params.src_gate = NFC_HCI_ADMIN_GATE;
params.dest_host = dest_host;
params.dest_gate = dest_gate;
*result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
NFC_HCI_ADM_CREATE_PIPE,
(u8 *) &params, sizeof(params), &skb);
if (*result == 0) {
resp = (struct hci_create_pipe_resp *)skb->data;
pipe = resp->pipe;
kfree_skb(skb);
pr_debug("pipe created=%d\n", pipe);
return pipe;
} else
return NFC_HCI_INVALID_PIPE;
}
static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
{
pr_debug("\n");
return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
}
static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
{
int r;
u8 param[2];
/* TODO: Find out what the identity reference data is
* and fill param with it. HCI spec 6.1.3.5 */
pr_debug("\n");
r = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
NFC_HCI_ADM_CLEAR_ALL_PIPE, param, 2, NULL);
return 0;
}
int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
{
int r;
u8 pipe = hdev->gate2pipe[gate];
pr_debug("\n");
if (pipe == NFC_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
r = nfc_hci_close_pipe(hdev, pipe);
if (r < 0)
return r;
if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
r = nfc_hci_delete_pipe(hdev, pipe);
if (r < 0)
return r;
}
hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
return 0;
}
EXPORT_SYMBOL(nfc_hci_disconnect_gate);
int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
{
int r;
pr_debug("\n");
r = nfc_hci_clear_all_pipes(hdev);
if (r < 0)
return r;
memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
return 0;
}
EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate)
{
u8 pipe = NFC_HCI_INVALID_PIPE;
bool pipe_created = false;
int r;
pr_debug("\n");
if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
return -EADDRINUSE;
switch (dest_gate) {
case NFC_HCI_LINK_MGMT_GATE:
pipe = NFC_HCI_LINK_MGMT_PIPE;
break;
case NFC_HCI_ADMIN_GATE:
pipe = NFC_HCI_ADMIN_PIPE;
break;
default:
pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
if (pipe == NFC_HCI_INVALID_PIPE)
return r;
pipe_created = true;
break;
}
r = nfc_hci_open_pipe(hdev, pipe);
if (r < 0) {
if (pipe_created)
if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
/* TODO: Cannot clean by deleting pipe...
* -> inconsistent state */
}
return r;
}
hdev->gate2pipe[dest_gate] = pipe;
return 0;
}
EXPORT_SYMBOL(nfc_hci_connect_gate);

830
net/nfc/hci/core.c Normal file
View File

@ -0,0 +1,830 @@
/*
* Copyright (C) 2012 Intel Corporation. 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 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.
*/
#define pr_fmt(fmt) "hci: %s: " fmt, __func__
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <net/nfc/nfc.h>
#include <net/nfc/hci.h>
#include "hci.h"
/* Largest headroom needed for outgoing HCI commands */
#define HCI_CMDS_HEADROOM 1
static void nfc_hci_msg_tx_work(struct work_struct *work)
{
struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
msg_tx_work);
struct hci_msg *msg;
struct sk_buff *skb;
int r = 0;
mutex_lock(&hdev->msg_tx_mutex);
if (hdev->cmd_pending_msg) {
if (timer_pending(&hdev->cmd_timer) == 0) {
if (hdev->cmd_pending_msg->cb)
hdev->cmd_pending_msg->cb(hdev,
NFC_HCI_ANY_E_TIMEOUT,
NULL,
hdev->
cmd_pending_msg->
cb_context);
kfree(hdev->cmd_pending_msg);
hdev->cmd_pending_msg = NULL;
} else
goto exit;
}
next_msg:
if (list_empty(&hdev->msg_tx_queue))
goto exit;
msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
list_del(&msg->msg_l);
pr_debug("msg_tx_queue has a cmd to send\n");
while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
r = hdev->ops->xmit(hdev, skb);
if (r < 0) {
kfree_skb(skb);
skb_queue_purge(&msg->msg_frags);
if (msg->cb)
msg->cb(hdev, NFC_HCI_ANY_E_NOK, NULL,
msg->cb_context);
kfree(msg);
break;
}
}
if (r)
goto next_msg;
if (msg->wait_response == false) {
kfree(msg);
goto next_msg;
}
hdev->cmd_pending_msg = msg;
mod_timer(&hdev->cmd_timer, jiffies +
msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
exit:
mutex_unlock(&hdev->msg_tx_mutex);
}
static void nfc_hci_msg_rx_work(struct work_struct *work)
{
struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
msg_rx_work);
struct sk_buff *skb;
struct hcp_message *message;
u8 pipe;
u8 type;
u8 instruction;
while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
pipe = skb->data[0];
skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
message = (struct hcp_message *)skb->data;
type = HCP_MSG_GET_TYPE(message->header);
instruction = HCP_MSG_GET_CMD(message->header);
skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
}
}
void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
struct sk_buff *skb)
{
mutex_lock(&hdev->msg_tx_mutex);
if (hdev->cmd_pending_msg == NULL) {
kfree_skb(skb);
goto exit;
}
del_timer_sync(&hdev->cmd_timer);
if (hdev->cmd_pending_msg->cb)
hdev->cmd_pending_msg->cb(hdev, result, skb,
hdev->cmd_pending_msg->cb_context);
else
kfree_skb(skb);
kfree(hdev->cmd_pending_msg);
hdev->cmd_pending_msg = NULL;
queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
exit:
mutex_unlock(&hdev->msg_tx_mutex);
}
void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
struct sk_buff *skb)
{
kfree_skb(skb);
}
static u32 nfc_hci_sak_to_protocol(u8 sak)
{
switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
return NFC_PROTO_MIFARE_MASK;
case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
return NFC_PROTO_ISO14443_MASK;
case NFC_HCI_TYPE_A_SEL_PROT_DEP:
return NFC_PROTO_NFC_DEP_MASK;
case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
default:
return 0xffffffff;
}
}
static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
{
struct nfc_target *targets;
struct sk_buff *atqa_skb = NULL;
struct sk_buff *sak_skb = NULL;
int r;
pr_debug("from gate %d\n", gate);
targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
if (targets == NULL)
return -ENOMEM;
switch (gate) {
case NFC_HCI_RF_READER_A_GATE:
r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
if (r < 0)
goto exit;
r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_RF_READER_A_SAK, &sak_skb);
if (r < 0)
goto exit;
if (atqa_skb->len != 2 || sak_skb->len != 1) {
r = -EPROTO;
goto exit;
}
targets->supported_protocols =
nfc_hci_sak_to_protocol(sak_skb->data[0]);
if (targets->supported_protocols == 0xffffffff) {
r = -EPROTO;
goto exit;
}
targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
targets->sel_res = sak_skb->data[0];
if (hdev->ops->complete_target_discovered) {
r = hdev->ops->complete_target_discovered(hdev, gate,
targets);
if (r < 0)
goto exit;
}
break;
case NFC_HCI_RF_READER_B_GATE:
targets->supported_protocols = NFC_PROTO_ISO14443_MASK;
break;
default:
if (hdev->ops->target_from_gate)
r = hdev->ops->target_from_gate(hdev, gate, targets);
else
r = -EPROTO;
if (r < 0)
goto exit;
if (hdev->ops->complete_target_discovered) {
r = hdev->ops->complete_target_discovered(hdev, gate,
targets);
if (r < 0)
goto exit;
}
break;
}
targets->hci_reader_gate = gate;
r = nfc_targets_found(hdev->ndev, targets, 1);
if (r < 0)
goto exit;
kfree(hdev->targets);
hdev->targets = targets;
targets = NULL;
hdev->target_count = 1;
exit:
kfree(targets);
kfree_skb(atqa_skb);
kfree_skb(sak_skb);
return r;
}
void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
struct sk_buff *skb)
{
int r = 0;
switch (event) {
case NFC_HCI_EVT_TARGET_DISCOVERED:
if (hdev->poll_started == false) {
r = -EPROTO;
goto exit;
}
if (skb->len < 1) { /* no status data? */
r = -EPROTO;
goto exit;
}
if (skb->data[0] == 3) {
/* TODO: Multiple targets in field, none activated
* poll is supposedly stopped, but there is no
* single target to activate, so nothing to report
* up.
* if we need to restart poll, we must save the
* protocols from the initial poll and reuse here.
*/
}
if (skb->data[0] != 0) {
r = -EPROTO;
goto exit;
}
r = nfc_hci_target_discovered(hdev,
nfc_hci_pipe2gate(hdev, pipe));
break;
default:
/* TODO: Unknown events are hardware specific
* pass them to the driver (needs a new hci_ops) */
break;
}
exit:
kfree_skb(skb);
if (r) {
/* TODO: There was an error dispatching the event,
* how to propagate up to nfc core?
*/
}
}
static void nfc_hci_cmd_timeout(unsigned long data)
{
struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
}
static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
u8 gates[])
{
int r;
u8 *p = gates;
while (gate_count--) {
r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p);
if (r < 0)
return r;
p++;
}
return 0;
}
static int hci_dev_session_init(struct nfc_hci_dev *hdev)
{
struct sk_buff *skb = NULL;
int r;
u8 hci_gates[] = { /* NFC_HCI_ADMIN_GATE MUST be first */
NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE,
NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE,
NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE
};
r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
NFC_HCI_ADMIN_GATE);
if (r < 0)
goto exit;
r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
if (r < 0)
goto disconnect_all;
if (skb->len && skb->len == strlen(hdev->init_data.session_id))
if (memcmp(hdev->init_data.session_id, skb->data,
skb->len) == 0) {
/* TODO ELa: restore gate<->pipe table from
* some TBD location.
* note: it doesn't seem possible to get the chip
* currently open gate/pipe table.
* It is only possible to obtain the supported
* gate list.
*/
/* goto exit
* For now, always do a full initialization */
}
r = nfc_hci_disconnect_all_gates(hdev);
if (r < 0)
goto exit;
r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates);
if (r < 0)
goto disconnect_all;
r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
hdev->init_data.gates);
if (r < 0)
goto disconnect_all;
r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_SESSION_IDENTITY,
hdev->init_data.session_id,
strlen(hdev->init_data.session_id));
if (r == 0)
goto exit;
disconnect_all:
nfc_hci_disconnect_all_gates(hdev);
exit:
if (skb)
kfree_skb(skb);
return r;
}
static int hci_dev_version(struct nfc_hci_dev *hdev)
{
int r;
struct sk_buff *skb;
r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
NFC_HCI_ID_MGMT_VERSION_SW, &skb);
if (r < 0)
return r;
if (skb->len != 3) {
kfree_skb(skb);
return -EINVAL;
}
hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
hdev->sw_patch = skb->data[0] & 0x0f;
hdev->sw_flashlib_major = skb->data[1];
hdev->sw_flashlib_minor = skb->data[2];
kfree_skb(skb);
r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
NFC_HCI_ID_MGMT_VERSION_HW, &skb);
if (r < 0)
return r;
if (skb->len != 3) {
kfree_skb(skb);
return -EINVAL;
}
hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
hdev->hw_version = skb->data[0] & 0x1f;
hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
hdev->hw_software = skb->data[1] & 0x3f;
hdev->hw_bsid = skb->data[2];
kfree_skb(skb);
pr_info("SOFTWARE INFO:\n");
pr_info("RomLib : %d\n", hdev->sw_romlib);
pr_info("Patch : %d\n", hdev->sw_patch);
pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
pr_info("HARDWARE INFO:\n");
pr_info("Derivative : %d\n", hdev->hw_derivative);
pr_info("HW Version : %d\n", hdev->hw_version);
pr_info("#MPW : %d\n", hdev->hw_mpw);
pr_info("Software : %d\n", hdev->hw_software);
pr_info("BSID Version : %d\n", hdev->hw_bsid);
return 0;
}
static int hci_dev_up(struct nfc_dev *nfc_dev)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
int r = 0;
if (hdev->ops->open) {
r = hdev->ops->open(hdev);
if (r < 0)
return r;
}
r = hci_dev_session_init(hdev);
if (r < 0)
goto exit;
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
goto exit;
if (hdev->ops->hci_ready) {
r = hdev->ops->hci_ready(hdev);
if (r < 0)
goto exit;
}
r = hci_dev_version(hdev);
if (r < 0)
goto exit;
exit:
if (r < 0)
if (hdev->ops->close)
hdev->ops->close(hdev);
return r;
}
static int hci_dev_down(struct nfc_dev *nfc_dev)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->close)
hdev->ops->close(hdev);
memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
return 0;
}
static int hci_start_poll(struct nfc_dev *nfc_dev, u32 protocols)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
int r;
if (hdev->ops->start_poll)
r = hdev->ops->start_poll(hdev, protocols);
else
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
if (r == 0)
hdev->poll_started = true;
return r;
}
static void hci_stop_poll(struct nfc_dev *nfc_dev)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->poll_started) {
nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
hdev->poll_started = false;
}
}
static struct nfc_target *hci_find_target(struct nfc_hci_dev *hdev,
u32 target_idx)
{
int i;
if (hdev->poll_started == false || hdev->targets == NULL)
return NULL;
for (i = 0; i < hdev->target_count; i++) {
if (hdev->targets[i].idx == target_idx)
return &hdev->targets[i];
}
return NULL;
}
static int hci_activate_target(struct nfc_dev *nfc_dev, u32 target_idx,
u32 protocol)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hci_find_target(hdev, target_idx) == NULL)
return -ENOMEDIUM;
return 0;
}
static void hci_deactivate_target(struct nfc_dev *nfc_dev, u32 target_idx)
{
}
static int hci_data_exchange(struct nfc_dev *nfc_dev, u32 target_idx,
struct sk_buff *skb, data_exchange_cb_t cb,
void *cb_context)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
int r;
struct nfc_target *target;
struct sk_buff *res_skb = NULL;
pr_debug("target_idx=%d\n", target_idx);
target = hci_find_target(hdev, target_idx);
if (target == NULL)
return -ENOMEDIUM;
switch (target->hci_reader_gate) {
case NFC_HCI_RF_READER_A_GATE:
case NFC_HCI_RF_READER_B_GATE:
if (hdev->ops->data_exchange) {
r = hdev->ops->data_exchange(hdev, target, skb,
&res_skb);
if (r <= 0) /* handled */
break;
}
*skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
NFC_HCI_WR_XCHG_DATA,
skb->data, skb->len, &res_skb);
/*
* TODO: Check RF Error indicator to make sure data is valid.
* It seems that HCI cmd can complete without error, but data
* can be invalid if an RF error occured? Ignore for now.
*/
if (r == 0)
skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
break;
default:
if (hdev->ops->data_exchange) {
r = hdev->ops->data_exchange(hdev, target, skb,
&res_skb);
if (r == 1)
r = -ENOTSUPP;
}
else
r = -ENOTSUPP;
}
kfree_skb(skb);
cb(cb_context, res_skb, r);
return 0;
}
struct nfc_ops hci_nfc_ops = {
.dev_up = hci_dev_up,
.dev_down = hci_dev_down,
.start_poll = hci_start_poll,
.stop_poll = hci_stop_poll,
.activate_target = hci_activate_target,
.deactivate_target = hci_deactivate_target,
.data_exchange = hci_data_exchange,
};
struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
struct nfc_hci_init_data *init_data,
u32 protocols,
int tx_headroom,
int tx_tailroom,
int max_link_payload)
{
struct nfc_hci_dev *hdev;
if (ops->xmit == NULL)
return NULL;
if (protocols == 0)
return NULL;
hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
if (hdev == NULL)
return NULL;
hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
tx_headroom + HCI_CMDS_HEADROOM,
tx_tailroom);
if (!hdev->ndev) {
kfree(hdev);
return NULL;
}
hdev->ops = ops;
hdev->max_data_link_payload = max_link_payload;
hdev->init_data = *init_data;
nfc_set_drvdata(hdev->ndev, hdev);
memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
return hdev;
}
EXPORT_SYMBOL(nfc_hci_allocate_device);
void nfc_hci_free_device(struct nfc_hci_dev *hdev)
{
nfc_free_device(hdev->ndev);
kfree(hdev);
}
EXPORT_SYMBOL(nfc_hci_free_device);
int nfc_hci_register_device(struct nfc_hci_dev *hdev)
{
struct device *dev = &hdev->ndev->dev;
const char *devname = dev_name(dev);
char name[32];
int r = 0;
mutex_init(&hdev->msg_tx_mutex);
INIT_LIST_HEAD(&hdev->msg_tx_queue);
INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
WQ_MEM_RECLAIM, 1);
if (hdev->msg_tx_wq == NULL) {
r = -ENOMEM;
goto exit;
}
init_timer(&hdev->cmd_timer);
hdev->cmd_timer.data = (unsigned long)hdev;
hdev->cmd_timer.function = nfc_hci_cmd_timeout;
skb_queue_head_init(&hdev->rx_hcp_frags);
INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
WQ_MEM_RECLAIM, 1);
if (hdev->msg_rx_wq == NULL) {
r = -ENOMEM;
goto exit;
}
skb_queue_head_init(&hdev->msg_rx_queue);
r = nfc_register_device(hdev->ndev);
exit:
if (r < 0) {
if (hdev->msg_tx_wq)
destroy_workqueue(hdev->msg_tx_wq);
if (hdev->msg_rx_wq)
destroy_workqueue(hdev->msg_rx_wq);
}
return r;
}
EXPORT_SYMBOL(nfc_hci_register_device);
void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
{
struct hci_msg *msg;
skb_queue_purge(&hdev->rx_hcp_frags);
skb_queue_purge(&hdev->msg_rx_queue);
while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg,
msg_l)) != NULL) {
list_del(&msg->msg_l);
skb_queue_purge(&msg->msg_frags);
kfree(msg);
}
del_timer_sync(&hdev->cmd_timer);
nfc_unregister_device(hdev->ndev);
destroy_workqueue(hdev->msg_tx_wq);
destroy_workqueue(hdev->msg_rx_wq);
}
EXPORT_SYMBOL(nfc_hci_unregister_device);
void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
{
hdev->clientdata = clientdata;
}
EXPORT_SYMBOL(nfc_hci_set_clientdata);
void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
{
return hdev->clientdata;
}
EXPORT_SYMBOL(nfc_hci_get_clientdata);
void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
struct hcp_packet *packet;
u8 type;
u8 instruction;
struct sk_buff *hcp_skb;
u8 pipe;
struct sk_buff *frag_skb;
int msg_len;
if (skb == NULL) {
/* TODO ELa: lower layer had permanent failure, need to
* propagate that up
*/
skb_queue_purge(&hdev->rx_hcp_frags);
return;
}
packet = (struct hcp_packet *)skb->data;
if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
skb_queue_tail(&hdev->rx_hcp_frags, skb);
return;
}
/* it's the last fragment. Does it need re-aggregation? */
if (skb_queue_len(&hdev->rx_hcp_frags)) {
pipe = packet->header & NFC_HCI_FRAGMENT;
skb_queue_tail(&hdev->rx_hcp_frags, skb);
msg_len = 0;
skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
msg_len += (frag_skb->len -
NFC_HCI_HCP_PACKET_HEADER_LEN);
}
hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
msg_len, GFP_KERNEL);
if (hcp_skb == NULL) {
/* TODO ELa: cannot deliver HCP message. How to
* propagate error up?
*/
}
*skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
memcpy(skb_put(hcp_skb, msg_len),
frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
msg_len);
}
skb_queue_purge(&hdev->rx_hcp_frags);
} else {
packet->header &= NFC_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 hcp_packet *)hcp_skb->data;
type = HCP_MSG_GET_TYPE(packet->message.header);
if (type == NFC_HCI_HCP_RESPONSE) {
pipe = packet->header;
instruction = HCP_MSG_GET_CMD(packet->message.header);
skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
NFC_HCI_HCP_MESSAGE_HEADER_LEN);
nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
} else {
skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
}
}
EXPORT_SYMBOL(nfc_hci_recv_frame);
MODULE_LICENSE("GPL");

139
net/nfc/hci/hci.h Normal file
View File

@ -0,0 +1,139 @@
/*
* Copyright (C) 2012 Intel Corporation. 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 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.
*/
#ifndef __LOCAL_HCI_H
#define __LOCAL_HCI_H
struct gate_pipe_map {
u8 gate;
u8 pipe;
};
struct hcp_message {
u8 header; /* type -cmd,evt,rsp- + instruction */
u8 data[];
} __packed;
struct hcp_packet {
u8 header; /* cbit+pipe */
struct hcp_message message;
} __packed;
/*
* HCI command execution completion callback.
* result will be one of the HCI response codes.
* skb contains the response data and must be disposed.
*/
typedef void (*hci_cmd_cb_t) (struct nfc_hci_dev *hdev, u8 result,
struct sk_buff *skb, void *cb_data);
struct hcp_exec_waiter {
wait_queue_head_t *wq;
bool exec_complete;
int exec_result;
struct sk_buff *result_skb;
};
struct hci_msg {
struct list_head msg_l;
struct sk_buff_head msg_frags;
bool wait_response;
hci_cmd_cb_t cb;
void *cb_context;
unsigned long completion_delay;
};
struct hci_create_pipe_params {
u8 src_gate;
u8 dest_host;
u8 dest_gate;
} __packed;
struct hci_create_pipe_resp {
u8 src_host;
u8 src_gate;
u8 dest_host;
u8 dest_gate;
u8 pipe;
} __packed;
#define NFC_HCI_FRAGMENT 0x7f
#define HCP_HEADER(type, instr) ((((type) & 0x03) << 6) | ((instr) & 0x3f))
#define HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
#define HCP_MSG_GET_CMD(header) (header & 0x3f)
int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
u8 type, u8 instruction,
const u8 *payload, size_t payload_len,
hci_cmd_cb_t cb, void *cb_data,
unsigned long completion_delay);
u8 nfc_hci_pipe2gate(struct nfc_hci_dev *hdev, u8 pipe);
void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
u8 instruction, struct sk_buff *skb);
/* HCP headers */
#define NFC_HCI_HCP_PACKET_HEADER_LEN 1
#define NFC_HCI_HCP_MESSAGE_HEADER_LEN 1
#define NFC_HCI_HCP_HEADER_LEN 2
/* HCP types */
#define NFC_HCI_HCP_COMMAND 0x00
#define NFC_HCI_HCP_EVENT 0x01
#define NFC_HCI_HCP_RESPONSE 0x02
/* Generic commands */
#define NFC_HCI_ANY_SET_PARAMETER 0x01
#define NFC_HCI_ANY_GET_PARAMETER 0x02
#define NFC_HCI_ANY_OPEN_PIPE 0x03
#define NFC_HCI_ANY_CLOSE_PIPE 0x04
/* Reader RF commands */
#define NFC_HCI_WR_XCHG_DATA 0x10
/* Admin commands */
#define NFC_HCI_ADM_CREATE_PIPE 0x10
#define NFC_HCI_ADM_DELETE_PIPE 0x11
#define NFC_HCI_ADM_NOTIFY_PIPE_CREATED 0x12
#define NFC_HCI_ADM_NOTIFY_PIPE_DELETED 0x13
#define NFC_HCI_ADM_CLEAR_ALL_PIPE 0x14
#define NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
/* Generic responses */
#define NFC_HCI_ANY_OK 0x00
#define NFC_HCI_ANY_E_NOT_CONNECTED 0x01
#define NFC_HCI_ANY_E_CMD_PAR_UNKNOWN 0x02
#define NFC_HCI_ANY_E_NOK 0x03
#define NFC_HCI_ANY_E_PIPES_FULL 0x04
#define NFC_HCI_ANY_E_REG_PAR_UNKNOWN 0x05
#define NFC_HCI_ANY_E_PIPE_NOT_OPENED 0x06
#define NFC_HCI_ANY_E_CMD_NOT_SUPPORTED 0x07
#define NFC_HCI_ANY_E_INHIBITED 0x08
#define NFC_HCI_ANY_E_TIMEOUT 0x09
#define NFC_HCI_ANY_E_REG_ACCESS_DENIED 0x0a
#define NFC_HCI_ANY_E_PIPE_ACCESS_DENIED 0x0b
/* Pipes */
#define NFC_HCI_INVALID_PIPE 0x80
#define NFC_HCI_LINK_MGMT_PIPE 0x00
#define NFC_HCI_ADMIN_PIPE 0x01
#endif /* __LOCAL_HCI_H */

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/*
* Copyright (C) 2012 Intel Corporation. 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 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.
*/
#define pr_fmt(fmt) "hci: %s: " fmt, __func__
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <net/nfc/hci.h>
#include "hci.h"
/*
* Payload is the HCP message data only. Instruction will be prepended.
* Guarantees that cb will be called upon completion or timeout delay
* counted from the moment the cmd is sent to the transport.
*/
int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
u8 type, u8 instruction,
const u8 *payload, size_t payload_len,
hci_cmd_cb_t cb, void *cb_data,
unsigned long completion_delay)
{
struct nfc_dev *ndev = hdev->ndev;
struct hci_msg *cmd;
const u8 *ptr = payload;
int hci_len, err;
bool firstfrag = true;
cmd = kzalloc(sizeof(struct hci_msg), GFP_KERNEL);
if (cmd == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&cmd->msg_l);
skb_queue_head_init(&cmd->msg_frags);
cmd->wait_response = (type == NFC_HCI_HCP_COMMAND) ? true : false;
cmd->cb = cb;
cmd->cb_context = cb_data;
cmd->completion_delay = completion_delay;
hci_len = payload_len + 1;
while (hci_len > 0) {
struct sk_buff *skb;
int skb_len, data_link_len;
struct hcp_packet *packet;
if (NFC_HCI_HCP_PACKET_HEADER_LEN + hci_len <=
hdev->max_data_link_payload)
data_link_len = hci_len;
else
data_link_len = hdev->max_data_link_payload -
NFC_HCI_HCP_PACKET_HEADER_LEN;
skb_len = ndev->tx_headroom + NFC_HCI_HCP_PACKET_HEADER_LEN +
data_link_len + ndev->tx_tailroom;
hci_len -= data_link_len;
skb = alloc_skb(skb_len, GFP_KERNEL);
if (skb == NULL) {
err = -ENOMEM;
goto out_skb_err;
}
skb_reserve(skb, ndev->tx_headroom);
skb_put(skb, NFC_HCI_HCP_PACKET_HEADER_LEN + data_link_len);
/* Only the last fragment will have the cb bit set to 1 */
packet = (struct hcp_packet *)skb->data;
packet->header = pipe;
if (firstfrag) {
firstfrag = false;
packet->message.header = HCP_HEADER(type, instruction);
if (ptr) {
memcpy(packet->message.data, ptr,
data_link_len - 1);
ptr += data_link_len - 1;
}
} else {
memcpy(&packet->message, ptr, data_link_len);
ptr += data_link_len;
}
/* This is the last fragment, set the cb bit */
if (hci_len == 0)
packet->header |= ~NFC_HCI_FRAGMENT;
skb_queue_tail(&cmd->msg_frags, skb);
}
mutex_lock(&hdev->msg_tx_mutex);
list_add_tail(&hdev->msg_tx_queue, &cmd->msg_l);
mutex_unlock(&hdev->msg_tx_mutex);
queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
return 0;
out_skb_err:
skb_queue_purge(&cmd->msg_frags);
kfree(cmd);
return err;
}
u8 nfc_hci_pipe2gate(struct nfc_hci_dev *hdev, u8 pipe)
{
int gate;
for (gate = 0; gate < NFC_HCI_MAX_GATES; gate++)
if (hdev->gate2pipe[gate] == pipe)
return gate;
return 0xff;
}
/*
* Receive hcp message for pipe, with type and cmd.
* skb contains optional message data only.
*/
void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
u8 instruction, struct sk_buff *skb)
{
switch (type) {
case NFC_HCI_HCP_RESPONSE:
nfc_hci_resp_received(hdev, instruction, skb);
break;
case NFC_HCI_HCP_COMMAND:
nfc_hci_cmd_received(hdev, pipe, instruction, skb);
break;
case NFC_HCI_HCP_EVENT:
nfc_hci_event_received(hdev, pipe, instruction, skb);
break;
default:
pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
type, instruction);
kfree_skb(skb);
break;
}
}