/*
* 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, see <http://www.gnu.org/licenses/>.
*/
#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"
#define MAX_FWI 4949
static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
const u8 *param, size_t param_len,
data_exchange_cb_t cb, void *cb_context)
{
pr_debug("exec cmd async 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?
*/
return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
param, param_len, cb, cb_context, MAX_FWI);
}
/*
* HCI command execution completion callback.
* err will be a standard linux error (may be converted from HCI response)
* skb contains the response data and must be disposed, or may be NULL if
* an error occured
*/
static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
{
struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
pr_debug("HCI Cmd completed with result=%d\n", err);
hcp_ew->exec_result = err;
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("exec cmd sync 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,
MAX_FWI);
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);
/*
* 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_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
const u8 *param, size_t param_len,
data_exchange_cb_t cb, void *cb_context)
{
u8 pipe;
pr_debug("\n");
pipe = hdev->gate2pipe[gate];
if (pipe == NFC_HCI_INVALID_PIPE)
return -EADDRNOTAVAIL;
return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
cb, cb_context);
}
EXPORT_SYMBOL(nfc_hci_send_cmd_async);
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 *) ¶ms, sizeof(params), &skb);
if (*result < 0)
return NFC_HCI_INVALID_PIPE;
resp = (struct hci_create_pipe_resp *)skb->data;
pipe = resp->pipe;
kfree_skb(skb);
pr_debug("pipe created=%d\n", pipe);
return 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)
{
u8 param[2];
size_t param_len = 2;
/* TODO: Find out what the identity reference data is
* and fill param with it. HCI spec 6.1.3.5 */
pr_debug("\n");
if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
param_len = 0;
return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
NULL);
}
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;
nfc_hci_reset_pipes(hdev);
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)
{
bool pipe_created = false;
int r;
pr_debug("\n");
if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
return 0;
if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
return -EADDRINUSE;
if (pipe != NFC_HCI_INVALID_PIPE)
goto open_pipe;
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;
}
open_pipe:
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->pipes[pipe].gate = dest_gate;
hdev->pipes[pipe].dest_host = dest_host;
hdev->gate2pipe[dest_gate] = pipe;
return 0;
}
EXPORT_SYMBOL(nfc_hci_connect_gate);