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@@ -0,0 +1,390 @@
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+/*
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+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <net/nfc/hci.h>
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+
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+#include "st21nfca.h"
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+#include "st21nfca_se.h"
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+
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+#define ST21NFCA_EVT_UICC_ACTIVATE 0x10
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+#define ST21NFCA_EVT_UICC_DEACTIVATE 0x13
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+#define ST21NFCA_EVT_SE_HARD_RESET 0x20
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+#define ST21NFCA_EVT_SE_SOFT_RESET 0x11
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+#define ST21NFCA_EVT_SE_END_OF_APDU_TRANSFER 0x21
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+#define ST21NFCA_EVT_SE_ACTIVATE 0x22
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+#define ST21NFCA_EVT_SE_DEACTIVATE 0x23
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+
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+#define ST21NFCA_EVT_TRANSMIT_DATA 0x10
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+#define ST21NFCA_EVT_WTX_REQUEST 0x11
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+
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+#define ST21NFCA_EVT_CONNECTIVITY 0x10
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+#define ST21NFCA_EVT_TRANSACTION 0x12
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+
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+#define ST21NFCA_ESE_HOST_ID 0xc0
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+
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+#define ST21NFCA_SE_TO_HOT_PLUG 1000
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+/* Connectivity pipe only */
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+#define ST21NFCA_SE_COUNT_PIPE_UICC 0x01
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+/* Connectivity + APDU Reader pipe */
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+#define ST21NFCA_SE_COUNT_PIPE_EMBEDDED 0x02
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+
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+#define ST21NFCA_SE_MODE_OFF 0x00
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+#define ST21NFCA_SE_MODE_ON 0x01
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+
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+#define ST21NFCA_PARAM_ATR 0x01
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+#define ST21NFCA_ATR_DEFAULT_BWI 0x04
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+
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+/*
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+ * WT = 2^BWI/10[s], convert into msecs and add a secure
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+ * room by increasing by 2 this timeout
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+ */
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+#define ST21NFCA_BWI_TO_TIMEOUT(x) ((1 << x) * 200)
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+#define ST21NFCA_ATR_GET_Y_FROM_TD(x) (x >> 4)
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+
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+/* If TA is present bit 0 is set */
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+#define ST21NFCA_ATR_TA_PRESENT(x) (x & 0x01)
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+/* If TB is present bit 1 is set */
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+#define ST21NFCA_ATR_TB_PRESENT(x) (x & 0x02)
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+
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+static u8 st21nfca_se_get_bwi(struct nfc_hci_dev *hdev)
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+{
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+ int i;
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+ u8 td;
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+
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+ /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
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+ for (i = 1; i < ST21NFCA_ESE_MAX_LENGTH; i++) {
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+ td = ST21NFCA_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
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+ if (ST21NFCA_ATR_TA_PRESENT(td))
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+ i++;
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+ if (ST21NFCA_ATR_TB_PRESENT(td)) {
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+ i++;
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+ return info->se_info.atr[i] >> 4;
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+ }
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+ }
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+ return ST21NFCA_ATR_DEFAULT_BWI;
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+}
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+
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+static void st21nfca_se_get_atr(struct nfc_hci_dev *hdev)
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+{
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+ int r;
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+ struct sk_buff *skb;
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+
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+ r = nfc_hci_get_param(hdev, ST21NFCA_APDU_READER_GATE,
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+ ST21NFCA_PARAM_ATR, &skb);
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+ if (r < 0)
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+ return;
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+
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+ if (skb->len <= ST21NFCA_ESE_MAX_LENGTH) {
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+ memcpy(info->se_info.atr, skb->data, skb->len);
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+ info->se_info.wt_timeout =
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+ ST21NFCA_BWI_TO_TIMEOUT(st21nfca_se_get_bwi(hdev));
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+ }
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+ kfree_skb(skb);
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+}
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+
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+static int st21nfca_hci_control_se(struct nfc_hci_dev *hdev, u32 se_idx,
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+ u8 state)
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+{
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+ int r;
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+ struct sk_buff *sk_host_list;
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+ u8 se_event, host_id;
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+
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+ switch (se_idx) {
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+ case NFC_HCI_UICC_HOST_ID:
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+ se_event = (state == ST21NFCA_SE_MODE_ON ?
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+ ST21NFCA_EVT_UICC_ACTIVATE :
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+ ST21NFCA_EVT_UICC_DEACTIVATE);
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+
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+ info->se_info.count_pipes = 0;
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+ info->se_info.expected_pipes = ST21NFCA_SE_COUNT_PIPE_UICC;
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+ break;
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+ case ST21NFCA_ESE_HOST_ID:
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+ se_event = (state == ST21NFCA_SE_MODE_ON ?
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+ ST21NFCA_EVT_SE_ACTIVATE :
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+ ST21NFCA_EVT_SE_DEACTIVATE);
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+
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+ info->se_info.count_pipes = 0;
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+ info->se_info.expected_pipes = ST21NFCA_SE_COUNT_PIPE_EMBEDDED;
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ /*
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+ * Wait for an EVT_HOT_PLUG in order to
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+ * retrieve a relevant host list.
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+ */
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+ reinit_completion(&info->se_info.req_completion);
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+ r = nfc_hci_send_event(hdev, ST21NFCA_DEVICE_MGNT_GATE, se_event,
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+ NULL, 0);
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+ if (r < 0)
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+ return r;
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+
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+ mod_timer(&info->se_info.se_active_timer, jiffies +
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+ msecs_to_jiffies(ST21NFCA_SE_TO_HOT_PLUG));
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+ info->se_info.se_active = true;
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+
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+ /* Ignore return value and check in any case the host_list */
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+ wait_for_completion_interruptible(&info->se_info.req_completion);
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+
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+ r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
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+ NFC_HCI_ADMIN_HOST_LIST,
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+ &sk_host_list);
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+ if (r < 0)
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+ return r;
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+
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+ host_id = sk_host_list->data[sk_host_list->len - 1];
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+ kfree_skb(sk_host_list);
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+
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+ if (state == ST21NFCA_SE_MODE_ON && host_id == se_idx)
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+ return se_idx;
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+ else if (state == ST21NFCA_SE_MODE_OFF && host_id != se_idx)
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+ return se_idx;
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+
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+ return -1;
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+}
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+
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+int st21nfca_hci_discover_se(struct nfc_hci_dev *hdev)
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+{
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+ int se_count = 0;
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+
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+ if (info->se_status->is_uicc_present) {
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+ nfc_add_se(hdev->ndev, NFC_HCI_UICC_HOST_ID, NFC_SE_UICC);
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+ se_count++;
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+ }
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+
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+ if (info->se_status->is_ese_present) {
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+ nfc_add_se(hdev->ndev, ST21NFCA_ESE_HOST_ID, NFC_SE_EMBEDDED);
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+ se_count++;
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+ }
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+
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+ return !se_count;
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+}
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+EXPORT_SYMBOL(st21nfca_hci_discover_se);
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+
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+int st21nfca_hci_enable_se(struct nfc_hci_dev *hdev, u32 se_idx)
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+{
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+ int r;
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+
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+ /*
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+ * According to upper layer, se_idx == NFC_SE_UICC when
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+ * info->se_status->is_uicc_enable is true should never happen.
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+ * Same for eSE.
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+ */
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+ r = st21nfca_hci_control_se(hdev, se_idx, ST21NFCA_SE_MODE_ON);
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+
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+ if (r == ST21NFCA_ESE_HOST_ID) {
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+ st21nfca_se_get_atr(hdev);
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+ r = nfc_hci_send_event(hdev, ST21NFCA_APDU_READER_GATE,
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+ ST21NFCA_EVT_SE_SOFT_RESET, NULL, 0);
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+ if (r < 0)
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+ return r;
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+ } else if (r < 0) {
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+ /*
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+ * The activation tentative failed, the secure element
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+ * is not connected. Remove from the list.
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+ */
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+ nfc_remove_se(hdev->ndev, se_idx);
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+ return r;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(st21nfca_hci_enable_se);
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+
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+int st21nfca_hci_disable_se(struct nfc_hci_dev *hdev, u32 se_idx)
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+{
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+ int r;
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+
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+ /*
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+ * According to upper layer, se_idx == NFC_SE_UICC when
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+ * info->se_status->is_uicc_enable is true should never happen
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+ * Same for eSE.
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+ */
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+ r = st21nfca_hci_control_se(hdev, se_idx, ST21NFCA_SE_MODE_OFF);
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+ if (r < 0)
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+ return r;
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(st21nfca_hci_disable_se);
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+
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+int st21nfca_hci_se_io(struct nfc_hci_dev *hdev, u32 se_idx,
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+ u8 *apdu, size_t apdu_length,
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+ se_io_cb_t cb, void *cb_context)
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+{
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+
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+ pr_debug("se_io %x\n", se_idx);
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+
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+ switch (se_idx) {
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+ case ST21NFCA_ESE_HOST_ID:
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+ info->se_info.cb = cb;
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+ info->se_info.cb_context = cb_context;
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+ mod_timer(&info->se_info.bwi_timer, jiffies +
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+ msecs_to_jiffies(info->se_info.wt_timeout));
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+ info->se_info.bwi_active = true;
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+ return nfc_hci_send_event(hdev, ST21NFCA_APDU_READER_GATE,
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+ ST21NFCA_EVT_TRANSMIT_DATA,
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+ apdu, apdu_length);
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+ default:
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+ return -ENODEV;
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+ }
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+}
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+EXPORT_SYMBOL(st21nfca_hci_se_io);
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+
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+static void st21nfca_se_wt_timeout(unsigned long data)
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+{
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+ /*
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+ * No answer from the secure element
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+ * within the defined timeout.
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+ * Let's send a reset request as recovery procedure.
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+ * According to the situation, we first try to send a software reset
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+ * to the secure element. If the next command is still not
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+ * answering in time, we send to the CLF a secure element hardware
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+ * reset request.
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+ */
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+ /* hardware reset managed through VCC_UICC_OUT power supply */
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+ u8 param = 0x01;
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+ struct st21nfca_hci_info *info = (struct st21nfca_hci_info *) data;
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+
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+ pr_debug("\n");
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+
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+ info->se_info.bwi_active = false;
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+
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+ if (!info->se_info.xch_error) {
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+ info->se_info.xch_error = true;
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+ nfc_hci_send_event(info->hdev, ST21NFCA_APDU_READER_GATE,
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+ ST21NFCA_EVT_SE_SOFT_RESET, NULL, 0);
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+ } else {
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+ info->se_info.xch_error = false;
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+ nfc_hci_send_event(info->hdev, ST21NFCA_DEVICE_MGNT_GATE,
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+ ST21NFCA_EVT_SE_HARD_RESET, ¶m, 1);
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+ }
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+ info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
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+}
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+
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+static void st21nfca_se_activation_timeout(unsigned long data)
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+{
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+ struct st21nfca_hci_info *info = (struct st21nfca_hci_info *) data;
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+
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+ pr_debug("\n");
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+
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+ info->se_info.se_active = false;
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+
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+ complete(&info->se_info.req_completion);
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+}
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+
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+/*
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+ * Returns:
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+ * <= 0: driver handled the event, skb consumed
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+ * 1: driver does not handle the event, please do standard processing
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+ */
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+int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
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+ u8 event, struct sk_buff *skb)
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+{
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+ int r = 0;
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+
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+ pr_debug("connectivity gate event: %x\n", event);
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+
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+ switch (event) {
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+ case ST21NFCA_EVT_CONNECTIVITY:
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+ break;
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+ case ST21NFCA_EVT_TRANSACTION:
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+ break;
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+ default:
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+ return 1;
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+ }
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+ kfree_skb(skb);
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+ return r;
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+}
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+EXPORT_SYMBOL(st21nfca_connectivity_event_received);
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+
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+int st21nfca_apdu_reader_event_received(struct nfc_hci_dev *hdev,
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+ u8 event, struct sk_buff *skb)
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+{
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+ int r = 0;
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+
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+ pr_debug("apdu reader gate event: %x\n", event);
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+
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+ switch (event) {
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+ case ST21NFCA_EVT_TRANSMIT_DATA:
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+ del_timer_sync(&info->se_info.bwi_timer);
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+ info->se_info.bwi_active = false;
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+ r = nfc_hci_send_event(hdev, ST21NFCA_DEVICE_MGNT_GATE,
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+ ST21NFCA_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
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+ if (r < 0)
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+ goto exit;
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+
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+ info->se_info.cb(info->se_info.cb_context,
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+ skb->data, skb->len, 0);
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+ break;
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+ case ST21NFCA_EVT_WTX_REQUEST:
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+ mod_timer(&info->se_info.bwi_timer, jiffies +
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+ msecs_to_jiffies(info->se_info.wt_timeout));
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+ break;
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+ }
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+
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+exit:
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+ kfree_skb(skb);
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+ return r;
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+}
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+EXPORT_SYMBOL(st21nfca_apdu_reader_event_received);
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+
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+void st21nfca_se_init(struct nfc_hci_dev *hdev)
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+{
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+ struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
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+
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+ init_completion(&info->se_info.req_completion);
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+ /* initialize timers */
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+ init_timer(&info->se_info.bwi_timer);
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+ info->se_info.bwi_timer.data = (unsigned long)info;
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+ info->se_info.bwi_timer.function = st21nfca_se_wt_timeout;
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+ info->se_info.bwi_active = false;
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+
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+ init_timer(&info->se_info.se_active_timer);
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+ info->se_info.se_active_timer.data = (unsigned long)info;
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+ info->se_info.se_active_timer.function = st21nfca_se_activation_timeout;
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+ info->se_info.se_active = false;
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+
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+ info->se_info.count_pipes = 0;
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+ info->se_info.expected_pipes = 0;
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+
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+ info->se_info.xch_error = false;
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|
|
+
|
|
|
+ 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);
|
Christophe Ricard