st21nfcb has 3 SWP lines and can support up to 3 secure elements (UICC/eSE and µSD in the future).
Some st21nfcb firmware does not support the nci command nci_nfcee_mode_set(NCI_NFCEE_DISABLE).
For this reason, we assume 2 secures elements are always present (UICC and eSE).
They will be added to the SE list once successfully activated. They will
be available only after running through enable_se handler or when the poll
in listen mode is started.
During initialization, the white_list will be always set assuming both
UICC & eSE are present.
On ese activation, the atr is retrieved to calculate a command exchange
timeout according to the first atr(TB) value.
The se_io will allow to transfer data over SWP. 2 kind of event may appear
after a data is sent over:
- ST21NFCB_EVT_TRANSMIT_DATA when receiving an apdu answer
- ST21NFCB_EVT_WTX_REQUEST when the secure element needs more time than
expected to compute a command. If this timeout expired, a first recovery
tentative consist to send a simple software reset command. If this
tentative still fail, a second recovery tentative consist to send a
hardware reset.
This function is only relevant for eSE like secure element.
Like st21nfca, we do reference pipe with a tuple (gate, host) in order to
keep the host information when receiving secure element event
(ex: EVT_TRANSACTION).
Signed-off-by: Christophe Ricard <christophe-h.ricard@xxxxxx>
---
drivers/nfc/st21nfcb/Makefile | 2 +-
drivers/nfc/st21nfcb/st21nfcb.c | 8 +-
drivers/nfc/st21nfcb/st21nfcb.h | 2 +
drivers/nfc/st21nfcb/st21nfcb_se.c | 610 +++++++++++++++++++++++++++++++++++++
drivers/nfc/st21nfcb/st21nfcb_se.h | 59 ++++
5 files changed, 679 insertions(+), 2 deletions(-)
create mode 100644 drivers/nfc/st21nfcb/st21nfcb_se.c
create mode 100644 drivers/nfc/st21nfcb/st21nfcb_se.h
diff --git a/drivers/nfc/st21nfcb/Makefile b/drivers/nfc/st21nfcb/Makefile
index 974c2e9..2f452d7 100644
--- a/drivers/nfc/st21nfcb/Makefile
+++ b/drivers/nfc/st21nfcb/Makefile
@@ -2,7 +2,7 @@
# Makefile for ST21NFCB NCI based NFC driver
#
-st21nfcb_nci-objs = ndlc.o st21nfcb.o st21nfcb_hci_core.o
+st21nfcb_nci-objs = ndlc.o st21nfcb.o st21nfcb_hci_core.o st21nfcb_se.o
obj-$(CONFIG_NFC_ST21NFCB) += st21nfcb_nci.o
st21nfcb_i2c-objs = i2c.o
diff --git a/drivers/nfc/st21nfcb/st21nfcb.c b/drivers/nfc/st21nfcb/st21nfcb.c
index ea63d58..d2b60eb 100644
--- a/drivers/nfc/st21nfcb/st21nfcb.c
+++ b/drivers/nfc/st21nfcb/st21nfcb.c
@@ -22,6 +22,7 @@
#include <net/nfc/nci_core.h>
#include "st21nfcb.h"
+#include "st21nfcb_se.h"
#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
@@ -78,6 +79,10 @@ static struct nci_ops st21nfcb_nci_ops = {
.close = st21nfcb_nci_close,
.send = st21nfcb_nci_send,
.get_rfprotocol = st21nfcb_nci_get_rfprotocol,
+ .discover_se = st21nfcb_nci_discover_se,
+ .enable_se = st21nfcb_nci_enable_se,
+ .disable_se = st21nfcb_nci_disable_se,
+ .se_io = st21nfcb_nci_se_io,
};
int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
@@ -114,9 +119,10 @@ int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
if (r) {
pr_err("Cannot register nfc device to nci core\n");
nci_free_device(ndlc->ndev);
+ return r;
}
- return r;
+ return st21nfcb_se_init(ndlc->ndev);
}
EXPORT_SYMBOL_GPL(st21nfcb_nci_probe);
diff --git a/drivers/nfc/st21nfcb/st21nfcb.h b/drivers/nfc/st21nfcb/st21nfcb.h
index ea58a56..5ef8a58 100644
--- a/drivers/nfc/st21nfcb/st21nfcb.h
+++ b/drivers/nfc/st21nfcb/st21nfcb.h
@@ -19,6 +19,7 @@
#ifndef __LOCAL_ST21NFCB_H_
#define __LOCAL_ST21NFCB_H_
+#include "st21nfcb_se.h"
#include "ndlc.h"
/* Define private flags: */
@@ -27,6 +28,7 @@
struct st21nfcb_nci_info {
struct llt_ndlc *ndlc;
unsigned long flags;
+ struct st21nfcb_se_info se_info;
};
void st21nfcb_nci_remove(struct nci_dev *ndev);
diff --git a/drivers/nfc/st21nfcb/st21nfcb_se.c b/drivers/nfc/st21nfcb/st21nfcb_se.c
new file mode 100644
index 0000000..cf65368
--- /dev/null
+++ b/drivers/nfc/st21nfcb/st21nfcb_se.c
@@ -0,0 +1,610 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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/>.
+ */
+
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+
+#include "st21nfcb.h"
+#include "st21nfcb_se.h"
+#include "st21nfcb_hci_core.h"
+
+struct st21nfcb_pipe_info {
+ u8 pipe_state;
+ u8 src_host_id;
+ u8 src_gate_id;
+ u8 dst_host_id;
+ u8 dst_gate_id;
+} __packed;
+
+/* Connectivity pipe only */
+#define ST21NFCB_SE_COUNT_PIPE_UICC 0x01
+/* Connectivity + APDU Reader pipe */
+#define ST21NFCB_SE_COUNT_PIPE_EMBEDDED 0x02
+
+#define ST21NFCB_SE_TO_HOT_PLUG 1000 /* msecs */
+#define ST21NFCB_SE_TO_PIPES 2000
+
+#define ST21NFCB_EVT_HOT_PLUG_IS_INHIBITED(x) (x->data[0] & 0x80)
+
+#define ST21NFCB_HCI_APDU_PARAM_ATR 0x01
+#define ST21NFCB_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01
+#define ST21NFCB_HCI_ADMIN_PARAM_WHITELIST 0x03
+#define ST21NFCB_HCI_ADMIN_PARAM_HOST_LIST 0x04
+
+#define ST21NFCB_EVT_SE_HARD_RESET 0x20
+#define ST21NFCB_EVT_TRANSMIT_DATA 0x10
+#define ST21NFCB_EVT_WTX_REQUEST 0x11
+#define ST21NFCB_EVT_SE_SOFT_RESET 0x11
+#define ST21NFCB_EVT_SE_END_OF_APDU_TRANSFER 0x21
+#define ST21NFCB_EVT_HOT_PLUG 0x03
+
+#define ST21NFCB_SE_MODE_OFF 0x00
+#define ST21NFCB_SE_MODE_ON 0x01
+
+#define ST21NFCB_EVT_CONNECTIVITY 0x10
+#define ST21NFCB_EVT_TRANSACTION 0x12
+
+#define ST21NFCB_DM_GETINFO 0x13
+#define ST21NFCB_DM_GETINFO_PIPE_LIST 0x02
+#define ST21NFCB_DM_GETINFO_PIPE_INFO 0x01
+#define ST21NFCB_DM_PIPE_CREATED 0x02
+#define ST21NFCB_DM_PIPE_OPEN 0x04
+#define ST21NFCB_DM_RF_ACTIVE 0x80
+#define ST21NFCB_DM_DISCONNECT 0x30
+
+#define ST21NFCB_DM_IS_PIPE_OPEN(p) \
+ ((p & 0x0f) == (ST21NFCB_DM_PIPE_CREATED | ST21NFCB_DM_PIPE_OPEN))
+
+#define ST21NFCB_ATR_DEFAULT_BWI 0x04
+
+/*
+ * WT = 2^BWI/10[s], convert into msecs and add a secure
+ * room by increasing by 2 this timeout
+ */
+#define ST21NFCB_BWI_TO_TIMEOUT(x) ((1 << x) * 200)
+#define ST21NFCB_ATR_GET_Y_FROM_TD(x) (x >> 4)
+
+/* If TA is present bit 0 is set */
+#define ST21NFCB_ATR_TA_PRESENT(x) (x & 0x01)
+/* If TB is present bit 1 is set */
+#define ST21NFCB_ATR_TB_PRESENT(x) (x & 0x02)
+
+/* Here are the mandatory pipe for st21nfcb */
+static struct st21nfcb_hci_gate st21nfcb_gates[] = {
+ {ST21NFCB_HCI_ADMIN_GATE, ST21NFCB_HCI_ADMIN_PIPE},
+ {ST21NFCB_HCI_LINK_MGMT_GATE, ST21NFCB_HCI_LINK_MGMT_PIPE},
+ {ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DEVICE_MGNT_PIPE},
+
+ /* Secure element pipes are created by secure element host */
+ {ST21NFCB_CONNECTIVITY_GATE, ST21NFCB_HCI_DO_NOT_OPEN_PIPE},
+ {ST21NFCB_APDU_READER_GATE, ST21NFCB_HCI_DO_NOT_OPEN_PIPE},
+};
+
+static u8 st21nfcb_se_get_bwi(struct nci_dev *ndev)
+{
+ int i;
+ u8 td;
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
+ for (i = 1; i < ST21NFCB_ESE_MAX_LENGTH; i++) {
+ td = ST21NFCB_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
+ if (ST21NFCB_ATR_TA_PRESENT(td))
+ i++;
+ if (ST21NFCB_ATR_TB_PRESENT(td)) {
+ i++;
+ return info->se_info.atr[i] >> 4;
+ }
+ }
+ return ST21NFCB_ATR_DEFAULT_BWI;
+}
+
+static void st21nfcb_se_get_atr(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ struct st21nfcb_hci_dev *hdev = info->se_info.hci_dev;
+ int r;
+ struct sk_buff *skb;
+
+ r = st21nfcb_hci_get_param(hdev, ST21NFCB_APDU_READER_GATE,
+ ST21NFCB_HCI_APDU_PARAM_ATR, &skb);
+ if (r < 0)
+ return;
+
+ if (skb->len <= ST21NFCB_ESE_MAX_LENGTH) {
+ memcpy(info->se_info.atr, skb->data, skb->len);
+
+ info->se_info.wt_timeout =
+ ST21NFCB_BWI_TO_TIMEOUT(st21nfcb_se_get_bwi(ndev));
+ }
+ kfree_skb(skb);
+}
+
+static int st21nfcb_hci_load_session(struct st21nfcb_hci_dev *hdev)
+{
+ int i, j, r;
+ struct sk_buff *skb_pipe_list, *skb_pipe_info;
+ struct st21nfcb_pipe_info *dm_pipe_info;
+ u8 pipe_list[] = { ST21NFCB_DM_GETINFO_PIPE_LIST,
+ ST21NFCB_TERMINAL_HOST_ID};
+ u8 pipe_info[] = { ST21NFCB_DM_GETINFO_PIPE_INFO,
+ ST21NFCB_TERMINAL_HOST_ID, 0};
+
+ /* On ST21NFCB device pipes number are dynamics
+ * If pipes are already created, hci_dev_up will fail.
+ * Doing a clear all pipe is a bad idea because:
+ * - It does useless EEPROM cycling
+ * - It might cause issue for secure elements support
+ * (such as removing connectivity or APDU reader pipe)
+ * A better approach on ST21NFCB is to:
+ * - get a pipe list for each host.
+ * (eg: ST21NFCB_HOST_CONTROLLER_ID for now).
+ * (TODO Later on UICC HOST and eSE HOST)
+ * - get pipe information
+ * - match retrieved pipe list in st21nfcb_gates
+ * ST21NFCB_DEVICE_MGNT_GATE is a proprietary gate
+ * with ST21NFCB_DEVICE_MGNT_PIPE.
+ * Pipe can be closed and need to be open.
+ */
+ r = st21nfcb_hci_connect_gate(hdev, ST21NFCB_HOST_CONTROLLER_ID,
+ ST21NFCB_DEVICE_MGNT_GATE,
+ ST21NFCB_DEVICE_MGNT_PIPE);
+ if (r < 0)
+ goto free_info;
+
+ /* Get pipe list */
+ r = st21nfcb_hci_send_cmd(hdev, ST21NFCB_DEVICE_MGNT_GATE,
+ ST21NFCB_DM_GETINFO, pipe_list, sizeof(pipe_list),
+ &skb_pipe_list);
+ if (r < 0)
+ goto free_info;
+
+ /* Complete the existing gate_pipe table */
+ for (i = 0; i < skb_pipe_list->len; i++) {
+ pipe_info[2] = skb_pipe_list->data[i];
+ r = st21nfcb_hci_send_cmd(hdev, ST21NFCB_DEVICE_MGNT_GATE,
+ ST21NFCB_DM_GETINFO, pipe_info,
+ sizeof(pipe_info), &skb_pipe_info);
+
+ if (r)
+ continue;
+
+ /*
+ * Match pipe ID and gate ID
+ * Output format from ST21NFC_DM_GETINFO is:
+ * - pipe state (1byte)
+ * - source hid (1byte)
+ * - source gid (1byte)
+ * - destination hid (1byte)
+ * - destination gid (1byte)
+ */
+ dm_pipe_info = (struct st21nfcb_pipe_info *)skb_pipe_info->data;
+ if (dm_pipe_info->dst_gate_id == ST21NFCB_APDU_READER_GATE &&
+ dm_pipe_info->src_host_id != ST21NFCB_ESE_HOST_ID) {
+ pr_err("Unexpected apdu_reader pipe on host %x\n",
+ dm_pipe_info->src_host_id);
+ continue;
+ }
+
+ for (j = 0; (j < ARRAY_SIZE(st21nfcb_gates)) &&
+ (st21nfcb_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
+ ;
+
+ if (j < ARRAY_SIZE(st21nfcb_gates) &&
+ st21nfcb_gates[j].gate == dm_pipe_info->dst_gate_id &&
+ ST21NFCB_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
+ st21nfcb_gates[j].pipe = pipe_info[2];
+
+ hdev->gate2pipe[st21nfcb_gates[j].gate] =
+ st21nfcb_gates[j].pipe;
+ hdev->pipes[st21nfcb_gates[j].pipe].gate =
+ st21nfcb_gates[j].gate;
+ hdev->pipes[st21nfcb_gates[j].pipe].host =
+ dm_pipe_info->src_host_id;
+ }
+ }
+
+ memcpy(hdev->init_data.gates, st21nfcb_gates, sizeof(st21nfcb_gates));
+
+free_info:
+ kfree_skb(skb_pipe_info);
+ kfree_skb(skb_pipe_list);
+ return r;
+}
+
+static void st21nfcb_hci_admin_event_received(struct st21nfcb_hci_dev *hdev,
+ u8 event, struct sk_buff *skb)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(hdev->ndev);
+
+ switch (event) {
+ case ST21NFCB_EVT_HOT_PLUG:
+ if (info->se_info.se_active) {
+ if (!ST21NFCB_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
+ del_timer_sync(&info->se_info.se_active_timer);
+ info->se_info.se_active = false;
+ complete(&info->se_info.req_completion);
+ } else {
+ mod_timer(&info->se_info.se_active_timer,
+ jiffies +
+ msecs_to_jiffies(ST21NFCB_SE_TO_PIPES));
+ }
+ }
+ break;
+ }
+}
+
+static int st21nfcb_hci_apdu_reader_event_received(struct st21nfcb_hci_dev *hdev,
+ u8 event,
+ struct sk_buff *skb)
+{
+ int r = 0;
+ struct st21nfcb_nci_info *info = nci_get_drvdata(hdev->ndev);
+
+ pr_debug("apdu reader gate event: %x\n", event);
+
+ switch (event) {
+ case ST21NFCB_EVT_TRANSMIT_DATA:
+ del_timer_sync(&info->se_info.bwi_timer);
+ info->se_info.bwi_active = false;
+ info->se_info.cb(info->se_info.cb_context,
+ skb->data, skb->len, 0);
+ break;
+ case ST21NFCB_EVT_WTX_REQUEST:
+ mod_timer(&info->se_info.bwi_timer, jiffies +
+ msecs_to_jiffies(info->se_info.wt_timeout));
+ break;
+ }
+
+ kfree_skb(skb);
+ return r;
+}
+
+/*
+ * Returns:
+ * <= 0: driver handled the event, skb consumed
+ * 1: driver does not handle the event, please do standard processing
+ */
+static int st21nfcb_hci_connectivity_event_received(struct st21nfcb_hci_dev *hdev,
+ u8 host, u8 event,
+ struct sk_buff *skb)
+{
+ int r = 0;
+
+ pr_debug("connectivity gate event: %x\n", event);
+
+ switch (event) {
+ case ST21NFCB_EVT_CONNECTIVITY:
+ break;
+ case ST21NFCB_EVT_TRANSACTION:
+ break;
+ default:
+ return 1;
+ }
+ kfree_skb(skb);
+ return r;
+}
+
+static void st21nfcb_hci_event_received(struct st21nfcb_hci_dev *hdev, u8 pipe,
+ u8 event, struct sk_buff *skb)
+{
+ u8 gate = hdev->pipes[pipe].gate;
+ u8 host = hdev->pipes[pipe].host;
+
+ switch (gate) {
+ case ST21NFCB_HCI_ADMIN_GATE:
+ st21nfcb_hci_admin_event_received(hdev, event, skb);
+ break;
+ case ST21NFCB_APDU_READER_GATE:
+ st21nfcb_hci_apdu_reader_event_received(hdev, event, skb);
+ break;
+ case ST21NFCB_CONNECTIVITY_GATE:
+ st21nfcb_hci_connectivity_event_received(hdev, host, event,
+ skb);
+ break;
+ }
+}
+
+static void st21nfcb_hci_cmd_received(struct st21nfcb_hci_dev *hdev, u8 pipe, u8 cmd,
+ struct sk_buff *skb)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(hdev->ndev);
+ u8 gate = hdev->pipes[pipe].gate;
+
+ pr_debug("cmd: %x\n", cmd);
+
+ switch (cmd) {
+ case ST21NFCB_HCI_ANY_OPEN_PIPE:
+ if (gate != ST21NFCB_APDU_READER_GATE &&
+ hdev->pipes[pipe].host != ST21NFCB_UICC_HOST_ID)
+ hdev->count_pipes++;
+
+ if (hdev->count_pipes == hdev->expected_pipes) {
+ del_timer_sync(&info->se_info.se_active_timer);
+ info->se_info.se_active = false;
+ hdev->count_pipes = 0;
+ complete(&info->se_info.req_completion);
+ }
+ break;
+ }
+}
+
+/*
+ * Remarks: On some early st21nfcb firmware, nci_nfcee_mode_set(0)
+ * is rejected
+ */
+static int st21nfcb_nci_control_se(struct nci_dev *ndev, u8 se_idx,
+ u8 state)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ struct st21nfcb_hci_dev *hdev = info->se_info.hci_dev;
+ int r;
+ struct sk_buff *sk_host_list;
+ u8 host_id;
+
+ switch (se_idx) {
+ case ST21NFCB_UICC_HOST_ID:
+ hdev->count_pipes = 0;
+ hdev->expected_pipes = ST21NFCB_SE_COUNT_PIPE_UICC;
+ break;
+ case ST21NFCB_ESE_HOST_ID:
+ hdev->count_pipes = 0;
+ hdev->expected_pipes = ST21NFCB_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 = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
+ if (r != NCI_STATUS_OK)
+ return r;
+
+ mod_timer(&info->se_info.se_active_timer, jiffies +
+ msecs_to_jiffies(ST21NFCB_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 = st21nfcb_hci_get_param(hdev, ST21NFCB_HCI_ADMIN_GATE,
+ ST21NFCB_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
+ if (r != ST21NFCB_HCI_ANY_OK)
+ return r;
+
+ host_id = sk_host_list->data[sk_host_list->len - 1];
+ kfree_skb(sk_host_list);
+ if (state == ST21NFCB_SE_MODE_ON && host_id == se_idx)
+ return se_idx;
+ else if (state == ST21NFCB_SE_MODE_OFF && host_id != se_idx)
+ return se_idx;
+
+ return -1;
+}
+
+int st21nfcb_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ struct st21nfcb_hci_dev *hdev = info->se_info.hci_dev;
+ int r;
+
+ pr_debug("st21nfcb_nci_disable_se\n");
+
+ if (se_idx == NFC_SE_EMBEDDED) {
+ r = st21nfcb_hci_send_event(hdev, ST21NFCB_APDU_READER_GATE,
+ ST21NFCB_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_disable_se);
+
+int st21nfcb_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ struct st21nfcb_hci_dev *hdev = info->se_info.hci_dev;
+ int r;
+
+ pr_debug("st21nfcb_nci_enable_se\n");
+
+ if (se_idx == ST21NFCB_HCI_HOST_ID_ESE) {
+ r = st21nfcb_hci_send_event(hdev, ST21NFCB_APDU_READER_GATE,
+ ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_enable_se);
+
+static struct st21nfcb_hci_ops hci_ops = {
+ .load_session = st21nfcb_hci_load_session,
+ .event_received = st21nfcb_hci_event_received,
+ .cmd_received = st21nfcb_hci_cmd_received,
+};
+
+int st21nfcb_nci_discover_se(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ struct st21nfcb_hci_dev *hdev;
+ u8 param[2];
+ int r;
+ int se_count = 0;
+
+ pr_debug("st21nfcb_nci_discover_se\n");
+
+ hdev = st21nfcb_hci_allocate(ndev, &hci_ops, "ST21BH",
+ st21nfcb_gates, sizeof(st21nfcb_gates));
+ if (!hdev)
+ return -ENOMEM;
+
+ info->se_info.hci_dev = hdev;
+
+ r = st21nfcb_hci_open_pipe(hdev, ST21NFCB_HCI_ADMIN_PIPE);
+ if (r != ST21NFCB_HCI_ANY_OK)
+ return r;
+
+ param[0] = ST21NFCB_UICC_HOST_ID;
+ param[1] = ST21NFCB_HCI_HOST_ID_ESE;
+ r = st21nfcb_hci_set_param(hdev, ST21NFCB_HCI_ADMIN_GATE,
+ ST21NFCB_HCI_ADMIN_PARAM_WHITELIST,
+ param, sizeof(param));
+ if (r != ST21NFCB_HCI_ANY_OK)
+ return r;
+
+ r = st21nfcb_nci_control_se(ndev, ST21NFCB_UICC_HOST_ID,
+ ST21NFCB_SE_MODE_ON);
+ if (r == ST21NFCB_UICC_HOST_ID) {
+ nfc_add_se(ndev->nfc_dev, ST21NFCB_UICC_HOST_ID, NFC_SE_UICC);
+ se_count++;
+ }
+
+ /* Try to enable eSE in order to check availability */
+ r = st21nfcb_nci_control_se(ndev, ST21NFCB_HCI_HOST_ID_ESE,
+ ST21NFCB_SE_MODE_ON);
+ if (r == ST21NFCB_HCI_HOST_ID_ESE) {
+ nfc_add_se(ndev->nfc_dev, ST21NFCB_HCI_HOST_ID_ESE,
+ NFC_SE_EMBEDDED);
+ se_count++;
+ st21nfcb_se_get_atr(ndev);
+ }
+
+ return !se_count;
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_discover_se);
+
+int st21nfcb_nci_se_io(struct nci_dev *ndev, u32 se_idx,
+ u8 *apdu, size_t apdu_length,
+ se_io_cb_t cb, void *cb_context)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ struct st21nfcb_hci_dev *hdev = info->se_info.hci_dev;
+
+ pr_debug("\n");
+
+ switch (se_idx) {
+ case ST21NFCB_HCI_HOST_ID_ESE:
+ 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 st21nfcb_hci_send_event(hdev, ST21NFCB_APDU_READER_GATE,
+ ST21NFCB_EVT_TRANSMIT_DATA, apdu,
+ apdu_length);
+ default:
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL(st21nfcb_nci_se_io);
+
+static void st21nfcb_se_wt_timeout(unsigned long data)
+{
+ /*
+ * 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 st21nfcb_nci_info *info = (struct st21nfcb_nci_info *) data;
+ struct st21nfcb_hci_dev *hdev = info->se_info.hci_dev;
+
+ pr_debug("\n");
+
+ info->se_info.bwi_active = false;
+
+ if (!info->se_info.xch_error) {
+ info->se_info.xch_error = true;
+ st21nfcb_hci_send_event(hdev, ST21NFCB_APDU_READER_GATE,
+ ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0);
+ } else {
+ info->se_info.xch_error = false;
+ st21nfcb_hci_send_event(hdev, ST21NFCB_DEVICE_MGNT_GATE,
+ ST21NFCB_EVT_SE_HARD_RESET, ¶m, 1);
+ }
+ info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
+}
+
+static void st21nfcb_se_activation_timeout(unsigned long data)
+{
+ struct st21nfcb_nci_info *info = (struct st21nfcb_nci_info *) data;
+
+ pr_debug("\n");
+
+ info->se_info.se_active = false;
+
+ complete(&info->se_info.req_completion);
+}
+
+int st21nfcb_se_init(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ init_completion(&info->se_info.req_completion);
+ /* initialize timers */
+ init_timer(&info->se_info.bwi_timer);
+ info->se_info.bwi_timer.data = (unsigned long)info;
+ info->se_info.bwi_timer.function = st21nfcb_se_wt_timeout;
+ info->se_info.bwi_active = false;
+
+ init_timer(&info->se_info.se_active_timer);
+ info->se_info.se_active_timer.data = (unsigned long)info;
+ info->se_info.se_active_timer.function =
+ st21nfcb_se_activation_timeout;
+ info->se_info.se_active = false;
+
+ info->se_info.xch_error = false;
+
+ info->se_info.wt_timeout =
+ ST21NFCB_BWI_TO_TIMEOUT(ST21NFCB_ATR_DEFAULT_BWI);
+
+ return 0;
+}
+EXPORT_SYMBOL(st21nfcb_se_init);
+
+void st21nfcb_se_deinit(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ 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.se_active = false;
+ info->se_info.bwi_active = false;
+ st21nfcb_hci_free(info->se_info.hci_dev);
+}
+EXPORT_SYMBOL(st21nfcb_se_deinit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/nfc/st21nfcb/st21nfcb_se.h b/drivers/nfc/st21nfcb/st21nfcb_se.h
new file mode 100644
index 0000000..979c7dd
--- /dev/null
+++ b/drivers/nfc/st21nfcb/st21nfcb_se.h
@@ -0,0 +1,59 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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/>.
+ */
+#ifndef __LOCAL_ST21NFCB_SE_H_
+#define __LOCAL_ST21NFCB_SE_H_
+
+#include "st21nfcb_hci_core.h"
+
+/*
+ * ref ISO7816-3 chap 8.1. the initial character TS is followed by a
+ * sequence of at most 32 characters.
+ */
+#define ST21NFCB_ESE_MAX_LENGTH 33
+#define ST21NFCB_HCI_HOST_ID_ESE 0xc0
+
+struct st21nfcb_se_info {
+ u8 atr[ST21NFCB_ESE_MAX_LENGTH];
+ struct completion req_completion;
+
+ struct timer_list bwi_timer;
+ int wt_timeout; /* in msecs */
+ bool bwi_active;
+
+ struct timer_list se_active_timer;
+ bool se_active;
+
+ struct st21nfcb_hci_dev *hci_dev;
+
+ bool xch_error;
+
+ se_io_cb_t cb;
+ void *cb_context;
+};
+
+int st21nfcb_se_init(struct nci_dev *ndev);
+void st21nfcb_se_deinit(struct nci_dev *ndev);
+
+int st21nfcb_nci_discover_se(struct nci_dev *ndev);
+int st21nfcb_nci_enable_se(struct nci_dev *ndev, u32 se_idx);
+int st21nfcb_nci_disable_se(struct nci_dev *ndev, u32 se_idx);
+int st21nfcb_nci_se_io(struct nci_dev *ndev, u32 se_idx,
+ u8 *apdu, size_t apdu_length,
+ se_io_cb_t cb, void *cb_context);
+
+#endif /* __LOCAL_ST21NFCB_NCI_H_ */
--
2.1.0
--
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