// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* Copyright (C) 2012 Intel Corporation. All rights reserved.
|
*/
|
|
#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);
|
