// 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/module.h>
#include <linux/nfc.h>
#include <net/nfc/nfc.h>
#include <net/nfc/hci.h>
#include <net/nfc/llc.h>
#include "hci.h"
/* Largest headroom needed for outgoing HCI commands */
#define HCI_CMDS_HEADROOM 1
int nfc_hci_result_to_errno(u8 result)
{
switch (result) {
case NFC_HCI_ANY_OK:
return 0;
case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
return -EOPNOTSUPP;
case NFC_HCI_ANY_E_TIMEOUT:
return -ETIME;
default:
return -1;
}
}
EXPORT_SYMBOL(nfc_hci_result_to_errno);
void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
{
int i = 0;
for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
}
memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
}
EXPORT_SYMBOL(nfc_hci_reset_pipes);
void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
{
int i = 0;
for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
if (hdev->pipes[i].dest_host != host)
continue;
hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
}
}
EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
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->shutting_down)
goto exit;
if (hdev->cmd_pending_msg) {
if (timer_pending(&hdev->cmd_timer) == 0) {
if (hdev->cmd_pending_msg->cb)
hdev->cmd_pending_msg->cb(hdev->
cmd_pending_msg->
cb_context,
NULL,
-ETIME);
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 = nfc_llc_xmit_from_hci(hdev->llc, skb);
if (r < 0) {
kfree_skb(skb);
skb_queue_purge(&msg->msg_frags);
if (msg->cb)
msg->cb(msg->cb_context, NULL, r);
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;
const 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);
}
}
static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
struct sk_buff *skb)
{
del_timer_sync(&hdev->cmd_timer);
if (hdev->cmd_pending_msg->cb)
hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
skb, err);
else
kfree_skb(skb);
kfree(hdev->cmd_pending_msg);
hdev->cmd_pending_msg = NULL;
schedule_work(&hdev->msg_tx_work);
}
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;
}
__nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
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)
{
u8 status = NFC_HCI_ANY_OK;
const struct hci_create_pipe_resp *create_info;
const struct hci_delete_pipe_noti *delete_info;
const struct hci_all_pipe_cleared_noti *cleared_info;
u8 gate;
pr_debug("from pipe %x cmd %x\n", pipe, cmd);
if (pipe >= NFC_HCI_MAX_PIPES) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
gate = hdev->pipes[pipe].gate;
switch (cmd) {
case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
if (skb->len != 5) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
create_info = (struct hci_create_pipe_resp *)skb->data;
if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
/* 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
*/
hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
hdev->pipes[create_info->pipe].dest_host =
create_info->src_host;
break;
case NFC_HCI_ANY_OPEN_PIPE:
if (gate == NFC_HCI_INVALID_GATE) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
break;
case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
if (skb->len != 1) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
delete_info = (struct hci_delete_pipe_noti *)skb->data;
if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
break;
case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
if (skb->len != 1) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
break;
default:
pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
break;
}
if (hdev->ops->cmd_received)
hdev->ops->cmd_received(hdev, pipe, cmd, skb);
exit:
nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
status, NULL, 0, NULL, NULL, 0);
kfree_skb(skb);
}
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;
}
}
EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
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;
struct sk_buff *uid_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(*(__be16 *)atqa_skb->data);
targets->sel_res = sak_skb->data[0];
r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_RF_READER_A_UID, &uid_skb);
if (r < 0)
goto exit;
if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
r = -EPROTO;
goto exit;
}
memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
targets->nfcid1_len = uid_skb->len;
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_B_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;
}
/* if driver set the new gate, we will skip the old one */
if (targets->hci_reader_gate == 0x00)
targets->hci_reader_gate = gate;
r = nfc_targets_found(hdev->ndev, targets, 1);
exit:
kfree(targets);
kfree_skb(atqa_skb);
kfree_skb(sak_skb);
kfree_skb(uid_skb);
return r;
}
EXPORT_SYMBOL(nfc_hci_target_discovered);
void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
struct sk_buff *skb)
{
int r = 0;
u8 gate;
if (pipe >= NFC_HCI_MAX_PIPES) {
pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
goto exit;
}
gate = hdev->pipes[pipe].gate;
if (gate == NFC_HCI_INVALID_GATE) {
pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
goto exit;
}
if (hdev->ops->event_received) {
r = hdev->ops->event_received(hdev, pipe, event, skb);
if (r <= 0)
goto exit_noskb;
}
switch (event) {
case NFC_HCI_EVT_TARGET_DISCOVERED:
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, gate);
break;
default:
pr_info("Discarded unknown event %x to gate %x\n", event, gate);
r = -EINVAL;
break;
}
exit:
kfree_skb(skb);
exit_noskb:
if (r)
nfc_hci_driver_failure(hdev, r);
}
static void nfc_hci_cmd_timeout(struct timer_list *t)
{
struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
schedule_work(&hdev->msg_tx_work);
}
static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
const struct nfc_hci_gate *gates)
{
int r;
while (gate_count--) {
r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
gates->gate, gates->pipe);
if (r < 0)
return r;
gates++;
}
return 0;
}
static int hci_dev_session_init(struct nfc_hci_dev *hdev)
{
struct sk_buff *skb = NULL;
int r;
if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
return -EPROTO;
r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
hdev->init_data.gates[0].gate,
hdev->init_data.gates[0].pipe);
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) &&
(memcmp(hdev->init_data.session_id, skb->data,
skb->len) == 0) && hdev->ops->load_session) {
/* Restore gate<->pipe table from some proprietary location. */
r = hdev->ops->load_session(hdev);
if (r < 0)
goto disconnect_all;
} else {
r = nfc_hci_disconnect_all_gates(hdev);
if (r < 0)
goto exit;
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:
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 == -EOPNOTSUPP) {
pr_info("Software/Hardware info not available\n");
return 0;
}
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 = nfc_llc_start(hdev->llc);
if (r < 0)
goto exit_close;
r = hci_dev_session_init(hdev);
if (r < 0)
goto exit_llc;
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
if (r < 0)
goto exit_llc;
if (hdev->ops->hci_ready) {
r = hdev->ops->hci_ready(hdev);
if (r < 0)
goto exit_llc;
}
r = hci_dev_version(hdev);
if (r < 0)
goto exit_llc;
return 0;
exit_llc:
nfc_llc_stop(hdev->llc);
exit_close:
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);
nfc_llc_stop(hdev->llc);
if (hdev->ops->close)
hdev->ops->close(hdev);
nfc_hci_reset_pipes(hdev);
return 0;
}
static int hci_start_poll(struct nfc_dev *nfc_dev,
u32 im_protocols, u32 tm_protocols)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->start_poll)
return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
else
return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_READER_REQUESTED,
NULL, 0);
}
static void hci_stop_poll(struct nfc_dev *nfc_dev)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->stop_poll)
hdev->ops->stop_poll(hdev);
else
nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
NFC_HCI_EVT_END_OPERATION, NULL, 0);
}
static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
__u8 comm_mode, __u8 *gb, size_t gb_len)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (!hdev->ops->dep_link_up)
return 0;
return hdev->ops->dep_link_up(hdev, target, comm_mode,
gb, gb_len);
}
static int hci_dep_link_down(struct nfc_dev *nfc_dev)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (!hdev->ops->dep_link_down)
return 0;
return hdev->ops->dep_link_down(hdev);
}
static int hci_activate_target(struct nfc_dev *nfc_dev,
struct nfc_target *target, u32 protocol)
{
return 0;
}
static void hci_deactivate_target(struct nfc_dev *nfc_dev,
struct nfc_target *target,
u8 mode)
{
}
#define HCI_CB_TYPE_TRANSCEIVE 1
static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
{
struct nfc_hci_dev *hdev = context;
switch (hdev->async_cb_type) {
case HCI_CB_TYPE_TRANSCEIVE:
/*
* 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 occurred? Ignore for now.
*/
if (err == 0)
skb_trim(skb, skb->len - 1); /* RF Err ind */
hdev->async_cb(hdev->async_cb_context, skb, err);
break;
default:
if (err == 0)
kfree_skb(skb);
break;
}
}
static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
struct sk_buff *skb, data_exchange_cb_t cb,
void *cb_context)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
int r;
pr_debug("target_idx=%d\n", target->idx);
switch (target->hci_reader_gate) {
case NFC_HCI_RF_READER_A_GATE:
case NFC_HCI_RF_READER_B_GATE:
if (hdev->ops->im_transceive) {
r = hdev->ops->im_transceive(hdev, target, skb, cb,
cb_context);
if (r <= 0) /* handled */
break;
}
*(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
hdev->async_cb = cb;
hdev->async_cb_context = cb_context;
r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
NFC_HCI_WR_XCHG_DATA, skb->data,
skb->len, hci_transceive_cb, hdev);
break;
default:
if (hdev->ops->im_transceive) {
r = hdev->ops->im_transceive(hdev, target, skb, cb,
cb_context);
if (r == 1)
r = -ENOTSUPP;
} else {
r = -ENOTSUPP;
}
break;
}
kfree_skb(skb);
return r;
}
static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (!hdev->ops->tm_send) {
kfree_skb(skb);
return -ENOTSUPP;
}
return hdev->ops->tm_send(hdev, skb);
}
static int hci_check_presence(struct nfc_dev *nfc_dev,
struct nfc_target *target)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (!hdev->ops->check_presence)
return 0;
return hdev->ops->check_presence(hdev, target);
}
static int hci_discover_se(struct nfc_dev *nfc_dev)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->discover_se)
return hdev->ops->discover_se(hdev);
return 0;
}
static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->enable_se)
return hdev->ops->enable_se(hdev, se_idx);
return 0;
}
static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->disable_se)
return hdev->ops->disable_se(hdev, se_idx);
return 0;
}
static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
u8 *apdu, size_t apdu_length,
se_io_cb_t cb, void *cb_context)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (hdev->ops->se_io)
return hdev->ops->se_io(hdev, se_idx, apdu,
apdu_length, cb, cb_context);
return 0;
}
static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
{
mutex_lock(&hdev->msg_tx_mutex);
if (hdev->cmd_pending_msg == NULL) {
nfc_driver_failure(hdev->ndev, err);
goto exit;
}
__nfc_hci_cmd_completion(hdev, err, NULL);
exit:
mutex_unlock(&hdev->msg_tx_mutex);
}
static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
{
nfc_hci_failure(hdev, err);
}
static void nfc_hci_recv_from_llc(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;
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) {
nfc_hci_failure(hdev, -ENOMEM);
return;
}
skb_put_u8(hcp_skb, pipe);
skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
skb_put_data(hcp_skb,
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);
schedule_work(&hdev->msg_rx_work);
}
}
static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
{
struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
if (!hdev->ops->fw_download)
return -ENOTSUPP;
return hdev->ops->fw_download(hdev, firmware_name);
}
static const 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,
.dep_link_up = hci_dep_link_up,
.dep_link_down = hci_dep_link_down,
.activate_target = hci_activate_target,
.deactivate_target = hci_deactivate_target,
.im_transceive = hci_transceive,
.tm_send = hci_tm_send,
.check_presence = hci_check_presence,
.fw_download = hci_fw_download,
.discover_se = hci_discover_se,
.enable_se = hci_enable_se,
.disable_se = hci_disable_se,
.se_io = hci_se_io,
};
struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops,
struct nfc_hci_init_data *init_data,
unsigned long quirks,
u32 protocols,
const char *llc_name,
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->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
nfc_hci_recv_from_llc, tx_headroom,
tx_tailroom, nfc_hci_llc_failure);
if (hdev->llc == NULL) {
kfree(hdev);
return NULL;
}
hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
tx_headroom + HCI_CMDS_HEADROOM,
tx_tailroom);
if (!hdev->ndev) {
nfc_llc_free(hdev->llc);
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);
nfc_hci_reset_pipes(hdev);
hdev->quirks = quirks;
return hdev;
}
EXPORT_SYMBOL(nfc_hci_allocate_device);
void nfc_hci_free_device(struct nfc_hci_dev *hdev)
{
nfc_free_device(hdev->ndev);
nfc_llc_free(hdev->llc);
kfree(hdev);
}
EXPORT_SYMBOL(nfc_hci_free_device);
int nfc_hci_register_device(struct nfc_hci_dev *hdev)
{
mutex_init(&hdev->msg_tx_mutex);
INIT_LIST_HEAD(&hdev->msg_tx_queue);
INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
skb_queue_head_init(&hdev->rx_hcp_frags);
INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
skb_queue_head_init(&hdev->msg_rx_queue);
return nfc_register_device(hdev->ndev);
}
EXPORT_SYMBOL(nfc_hci_register_device);
void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
{
struct hci_msg *msg, *n;
mutex_lock(&hdev->msg_tx_mutex);
if (hdev->cmd_pending_msg) {
if (hdev->cmd_pending_msg->cb)
hdev->cmd_pending_msg->cb(
hdev->cmd_pending_msg->cb_context,
NULL, -ESHUTDOWN);
kfree(hdev->cmd_pending_msg);
hdev->cmd_pending_msg = NULL;
}
hdev->shutting_down = true;
mutex_unlock(&hdev->msg_tx_mutex);
del_timer_sync(&hdev->cmd_timer);
cancel_work_sync(&hdev->msg_tx_work);
cancel_work_sync(&hdev->msg_rx_work);
nfc_unregister_device(hdev->ndev);
skb_queue_purge(&hdev->rx_hcp_frags);
skb_queue_purge(&hdev->msg_rx_queue);
list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
list_del(&msg->msg_l);
skb_queue_purge(&msg->msg_frags);
kfree(msg);
}
}
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_driver_failure(struct nfc_hci_dev *hdev, int err)
{
nfc_hci_failure(hdev, err);
}
EXPORT_SYMBOL(nfc_hci_driver_failure);
void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
nfc_llc_rcv_from_drv(hdev->llc, skb);
}
EXPORT_SYMBOL(nfc_hci_recv_frame);
static int __init nfc_hci_init(void)
{
return nfc_llc_init();
}
static void __exit nfc_hci_exit(void)
{
nfc_llc_exit();
}
subsys_initcall(nfc_hci_init);
module_exit(nfc_hci_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NFC HCI Core");
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