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alistair23-linux/drivers/nfc/st21nfca/se.c
Thomas Gleixner 46fe777164 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 399 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 33 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531081038.745679586@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:12 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
*/
#include <net/nfc/hci.h>
#include "st21nfca.h"
#define ST21NFCA_EVT_UICC_ACTIVATE 0x10
#define ST21NFCA_EVT_UICC_DEACTIVATE 0x13
#define ST21NFCA_EVT_SE_HARD_RESET 0x20
#define ST21NFCA_EVT_SE_SOFT_RESET 0x11
#define ST21NFCA_EVT_SE_END_OF_APDU_TRANSFER 0x21
#define ST21NFCA_EVT_SE_ACTIVATE 0x22
#define ST21NFCA_EVT_SE_DEACTIVATE 0x23
#define ST21NFCA_EVT_TRANSMIT_DATA 0x10
#define ST21NFCA_EVT_WTX_REQUEST 0x11
#define ST21NFCA_EVT_CONNECTIVITY 0x10
#define ST21NFCA_EVT_TRANSACTION 0x12
#define ST21NFCA_SE_TO_HOT_PLUG 1000
/* Connectivity pipe only */
#define ST21NFCA_SE_COUNT_PIPE_UICC 0x01
/* Connectivity + APDU Reader pipe */
#define ST21NFCA_SE_COUNT_PIPE_EMBEDDED 0x02
#define ST21NFCA_SE_MODE_OFF 0x00
#define ST21NFCA_SE_MODE_ON 0x01
#define ST21NFCA_PARAM_ATR 0x01
#define ST21NFCA_ATR_DEFAULT_BWI 0x04
/*
* WT = 2^BWI/10[s], convert into msecs and add a secure
* room by increasing by 2 this timeout
*/
#define ST21NFCA_BWI_TO_TIMEOUT(x) ((1 << x) * 200)
#define ST21NFCA_ATR_GET_Y_FROM_TD(x) (x >> 4)
/* If TA is present bit 0 is set */
#define ST21NFCA_ATR_TA_PRESENT(x) (x & 0x01)
/* If TB is present bit 1 is set */
#define ST21NFCA_ATR_TB_PRESENT(x) (x & 0x02)
static u8 st21nfca_se_get_bwi(struct nfc_hci_dev *hdev)
{
int i;
u8 td;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
/* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
for (i = 1; i < ST21NFCA_ESE_MAX_LENGTH; i++) {
td = ST21NFCA_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
if (ST21NFCA_ATR_TA_PRESENT(td))
i++;
if (ST21NFCA_ATR_TB_PRESENT(td)) {
i++;
return info->se_info.atr[i] >> 4;
}
}
return ST21NFCA_ATR_DEFAULT_BWI;
}
static void st21nfca_se_get_atr(struct nfc_hci_dev *hdev)
{
int r;
struct sk_buff *skb;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
r = nfc_hci_get_param(hdev, ST21NFCA_APDU_READER_GATE,
ST21NFCA_PARAM_ATR, &skb);
if (r < 0)
return;
if (skb->len <= ST21NFCA_ESE_MAX_LENGTH) {
memcpy(info->se_info.atr, skb->data, skb->len);
info->se_info.wt_timeout =
ST21NFCA_BWI_TO_TIMEOUT(st21nfca_se_get_bwi(hdev));
}
kfree_skb(skb);
}
static int st21nfca_hci_control_se(struct nfc_hci_dev *hdev, u32 se_idx,
u8 state)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
int r, i;
struct sk_buff *sk_host_list;
u8 se_event, host_id;
switch (se_idx) {
case NFC_HCI_UICC_HOST_ID:
se_event = (state == ST21NFCA_SE_MODE_ON ?
ST21NFCA_EVT_UICC_ACTIVATE :
ST21NFCA_EVT_UICC_DEACTIVATE);
info->se_info.count_pipes = 0;
info->se_info.expected_pipes = ST21NFCA_SE_COUNT_PIPE_UICC;
break;
case ST21NFCA_ESE_HOST_ID:
se_event = (state == ST21NFCA_SE_MODE_ON ?
ST21NFCA_EVT_SE_ACTIVATE :
ST21NFCA_EVT_SE_DEACTIVATE);
info->se_info.count_pipes = 0;
info->se_info.expected_pipes = ST21NFCA_SE_COUNT_PIPE_EMBEDDED;
break;
default:
return -EINVAL;
}
/*
* Wait for an EVT_HOT_PLUG in order to
* retrieve a relevant host list.
*/
reinit_completion(&info->se_info.req_completion);
r = nfc_hci_send_event(hdev, ST21NFCA_DEVICE_MGNT_GATE, se_event,
NULL, 0);
if (r < 0)
return r;
mod_timer(&info->se_info.se_active_timer, jiffies +
msecs_to_jiffies(ST21NFCA_SE_TO_HOT_PLUG));
info->se_info.se_active = true;
/* Ignore return value and check in any case the host_list */
wait_for_completion_interruptible(&info->se_info.req_completion);
r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
NFC_HCI_ADMIN_HOST_LIST,
&sk_host_list);
if (r < 0)
return r;
for (i = 0; i < sk_host_list->len &&
sk_host_list->data[i] != se_idx; i++)
;
host_id = sk_host_list->data[i];
kfree_skb(sk_host_list);
if (state == ST21NFCA_SE_MODE_ON && host_id == se_idx)
return se_idx;
else if (state == ST21NFCA_SE_MODE_OFF && host_id != se_idx)
return se_idx;
return -1;
}
int st21nfca_hci_discover_se(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
int se_count = 0;
if (test_bit(ST21NFCA_FACTORY_MODE, &hdev->quirks))
return 0;
if (info->se_status->is_uicc_present) {
nfc_add_se(hdev->ndev, NFC_HCI_UICC_HOST_ID, NFC_SE_UICC);
se_count++;
}
if (info->se_status->is_ese_present) {
nfc_add_se(hdev->ndev, ST21NFCA_ESE_HOST_ID, NFC_SE_EMBEDDED);
se_count++;
}
return !se_count;
}
EXPORT_SYMBOL(st21nfca_hci_discover_se);
int st21nfca_hci_enable_se(struct nfc_hci_dev *hdev, u32 se_idx)
{
int r;
/*
* According to upper layer, se_idx == NFC_SE_UICC when
* info->se_status->is_uicc_enable is true should never happen.
* Same for eSE.
*/
r = st21nfca_hci_control_se(hdev, se_idx, ST21NFCA_SE_MODE_ON);
if (r == ST21NFCA_ESE_HOST_ID) {
st21nfca_se_get_atr(hdev);
r = nfc_hci_send_event(hdev, ST21NFCA_APDU_READER_GATE,
ST21NFCA_EVT_SE_SOFT_RESET, NULL, 0);
if (r < 0)
return r;
} else if (r < 0) {
/*
* The activation tentative failed, the secure element
* is not connected. Remove from the list.
*/
nfc_remove_se(hdev->ndev, se_idx);
return r;
}
return 0;
}
EXPORT_SYMBOL(st21nfca_hci_enable_se);
int st21nfca_hci_disable_se(struct nfc_hci_dev *hdev, u32 se_idx)
{
int r;
/*
* According to upper layer, se_idx == NFC_SE_UICC when
* info->se_status->is_uicc_enable is true should never happen
* Same for eSE.
*/
r = st21nfca_hci_control_se(hdev, se_idx, ST21NFCA_SE_MODE_OFF);
if (r < 0)
return r;
return 0;
}
EXPORT_SYMBOL(st21nfca_hci_disable_se);
int st21nfca_hci_se_io(struct nfc_hci_dev *hdev, u32 se_idx,
u8 *apdu, size_t apdu_length,
se_io_cb_t cb, void *cb_context)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
pr_debug("se_io %x\n", se_idx);
switch (se_idx) {
case ST21NFCA_ESE_HOST_ID:
info->se_info.cb = cb;
info->se_info.cb_context = cb_context;
mod_timer(&info->se_info.bwi_timer, jiffies +
msecs_to_jiffies(info->se_info.wt_timeout));
info->se_info.bwi_active = true;
return nfc_hci_send_event(hdev, ST21NFCA_APDU_READER_GATE,
ST21NFCA_EVT_TRANSMIT_DATA,
apdu, apdu_length);
default:
return -ENODEV;
}
}
EXPORT_SYMBOL(st21nfca_hci_se_io);
static void st21nfca_se_wt_timeout(struct timer_list *t)
{
/*
* No answer from the secure element
* within the defined timeout.
* Let's send a reset request as recovery procedure.
* According to the situation, we first try to send a software reset
* to the secure element. If the next command is still not
* answering in time, we send to the CLF a secure element hardware
* reset request.
*/
/* hardware reset managed through VCC_UICC_OUT power supply */
u8 param = 0x01;
struct st21nfca_hci_info *info = from_timer(info, t,
se_info.bwi_timer);
pr_debug("\n");
info->se_info.bwi_active = false;
if (!info->se_info.xch_error) {
info->se_info.xch_error = true;
nfc_hci_send_event(info->hdev, ST21NFCA_APDU_READER_GATE,
ST21NFCA_EVT_SE_SOFT_RESET, NULL, 0);
} else {
info->se_info.xch_error = false;
nfc_hci_send_event(info->hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_EVT_SE_HARD_RESET, &param, 1);
}
info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
}
static void st21nfca_se_activation_timeout(struct timer_list *t)
{
struct st21nfca_hci_info *info = from_timer(info, t,
se_info.se_active_timer);
pr_debug("\n");
info->se_info.se_active = false;
complete(&info->se_info.req_completion);
}
/*
* Returns:
* <= 0: driver handled the event, skb consumed
* 1: driver does not handle the event, please do standard processing
*/
int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
u8 event, struct sk_buff *skb)
{
int r = 0;
struct device *dev = &hdev->ndev->dev;
struct nfc_evt_transaction *transaction;
pr_debug("connectivity gate event: %x\n", event);
switch (event) {
case ST21NFCA_EVT_CONNECTIVITY:
r = nfc_se_connectivity(hdev->ndev, host);
break;
case ST21NFCA_EVT_TRANSACTION:
/*
* According to specification etsi 102 622
* 11.2.2.4 EVT_TRANSACTION Table 52
* Description Tag Length
* AID 81 5 to 16
* PARAMETERS 82 0 to 255
*/
if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
return -EPROTO;
transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
skb->len - 2, GFP_KERNEL);
transaction->aid_len = skb->data[1];
memcpy(transaction->aid, &skb->data[2],
transaction->aid_len);
/* Check next byte is PARAMETERS tag (82) */
if (skb->data[transaction->aid_len + 2] !=
NFC_EVT_TRANSACTION_PARAMS_TAG)
return -EPROTO;
transaction->params_len = skb->data[transaction->aid_len + 3];
memcpy(transaction->params, skb->data +
transaction->aid_len + 4, transaction->params_len);
r = nfc_se_transaction(hdev->ndev, host, transaction);
break;
default:
nfc_err(&hdev->ndev->dev, "Unexpected event on connectivity gate\n");
return 1;
}
kfree_skb(skb);
return r;
}
EXPORT_SYMBOL(st21nfca_connectivity_event_received);
int st21nfca_apdu_reader_event_received(struct nfc_hci_dev *hdev,
u8 event, struct sk_buff *skb)
{
int r = 0;
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
pr_debug("apdu reader gate event: %x\n", event);
switch (event) {
case ST21NFCA_EVT_TRANSMIT_DATA:
del_timer_sync(&info->se_info.bwi_timer);
info->se_info.bwi_active = false;
r = nfc_hci_send_event(hdev, ST21NFCA_DEVICE_MGNT_GATE,
ST21NFCA_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
if (r < 0)
goto exit;
info->se_info.cb(info->se_info.cb_context,
skb->data, skb->len, 0);
break;
case ST21NFCA_EVT_WTX_REQUEST:
mod_timer(&info->se_info.bwi_timer, jiffies +
msecs_to_jiffies(info->se_info.wt_timeout));
break;
default:
nfc_err(&hdev->ndev->dev, "Unexpected event on apdu reader gate\n");
return 1;
}
exit:
kfree_skb(skb);
return r;
}
EXPORT_SYMBOL(st21nfca_apdu_reader_event_received);
void st21nfca_se_init(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
init_completion(&info->se_info.req_completion);
/* initialize timers */
timer_setup(&info->se_info.bwi_timer, st21nfca_se_wt_timeout, 0);
info->se_info.bwi_active = false;
timer_setup(&info->se_info.se_active_timer,
st21nfca_se_activation_timeout, 0);
info->se_info.se_active = false;
info->se_info.count_pipes = 0;
info->se_info.expected_pipes = 0;
info->se_info.xch_error = false;
info->se_info.wt_timeout =
ST21NFCA_BWI_TO_TIMEOUT(ST21NFCA_ATR_DEFAULT_BWI);
}
EXPORT_SYMBOL(st21nfca_se_init);
void st21nfca_se_deinit(struct nfc_hci_dev *hdev)
{
struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
if (info->se_info.bwi_active)
del_timer_sync(&info->se_info.bwi_timer);
if (info->se_info.se_active)
del_timer_sync(&info->se_info.se_active_timer);
info->se_info.bwi_active = false;
info->se_info.se_active = false;
}
EXPORT_SYMBOL(st21nfca_se_deinit);
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