NFC: st21nfcb: Add support for secure element (8ae01f79) · Commits · 戴 / test

drivers/nfc/st21nfcb/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -2,7 +2,7 @@
		# Makefile for ST21NFCB NCI based NFC driver
		#

		st21nfcb_nci-objs = ndlc.o st21nfcb.o
		st21nfcb_nci-objs = ndlc.o st21nfcb.o st21nfcb_se.o
		obj-$(CONFIG_NFC_ST21NFCB) += st21nfcb_nci.o

		st21nfcb_i2c-objs = i2c.o

drivers/nfc/st21nfcb/st21nfcb.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -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 +79,13 @@ 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,
		.hci_load_session = st21nfcb_hci_load_session,
		.hci_event_received = st21nfcb_hci_event_received,
		.hci_cmd_received = st21nfcb_hci_cmd_received,
		};

		int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
		@@ -114,9 +122,10 @@ 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);

drivers/nfc/st21nfcb/st21nfcb.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);

drivers/nfc/st21nfcb/st21nfcb_se.c

0 → 100644

+672 −0

Original line number	Diff line number	Diff line
		/*
		* 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 <linux/delay.h>
		#include <net/nfc/nci.h>
		#include <net/nfc/nci_core.h>

		#include "st21nfcb.h"
		#include "st21nfcb_se.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;

		/* Hosts */
		#define ST21NFCB_HOST_CONTROLLER_ID 0x00
		#define ST21NFCB_TERMINAL_HOST_ID 0x01
		#define ST21NFCB_UICC_HOST_ID 0x02
		#define ST21NFCB_ESE_HOST_ID 0xc0

		/* Gates */
		#define ST21NFCB_DEVICE_MGNT_GATE 0x01
		#define ST21NFCB_APDU_READER_GATE 0xf0
		#define ST21NFCB_CONNECTIVITY_GATE 0x41

		/* Pipes */
		#define ST21NFCB_DEVICE_MGNT_PIPE 0x02

		/* 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 NCI_HCI_APDU_PARAM_ATR 0x01
		#define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01
		#define NCI_HCI_ADMIN_PARAM_WHITELIST 0x03
		#define NCI_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)

		#define ST21NFCB_NUM_DEVICES 256

		static DECLARE_BITMAP(dev_mask, ST21NFCB_NUM_DEVICES);

		/* Here are the mandatory pipe for st21nfcb */
		static struct nci_hci_gate st21nfcb_gates[] = {
		{NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
		ST21NFCB_HOST_CONTROLLER_ID},
		{NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
		ST21NFCB_HOST_CONTROLLER_ID},
		{ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DEVICE_MGNT_PIPE,
		ST21NFCB_HOST_CONTROLLER_ID},

		/* Secure element pipes are created by secure element host */
		{ST21NFCB_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
		ST21NFCB_HOST_CONTROLLER_ID},
		{ST21NFCB_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
		ST21NFCB_HOST_CONTROLLER_ID},
		};

		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);
		int r;
		struct sk_buff *skb;

		r = nci_hci_get_param(ndev, ST21NFCB_APDU_READER_GATE,
		NCI_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);
		}

		int st21nfcb_hci_load_session(struct nci_dev *ndev)
		{
		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 = nci_hci_connect_gate(ndev, ST21NFCB_HOST_CONTROLLER_ID,
		ST21NFCB_DEVICE_MGNT_GATE,
		ST21NFCB_DEVICE_MGNT_PIPE);
		if (r < 0)
		goto free_info;

		/* Get pipe list */
		r = nci_hci_send_cmd(ndev, 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 = nci_hci_send_cmd(ndev, 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];

		ndev->hci_dev->gate2pipe[st21nfcb_gates[j].gate] =
		st21nfcb_gates[j].pipe;
		ndev->hci_dev->pipes[st21nfcb_gates[j].pipe].gate =
		st21nfcb_gates[j].gate;
		ndev->hci_dev->pipes[st21nfcb_gates[j].pipe].host =
		dm_pipe_info->src_host_id;
		}
		}

		memcpy(ndev->hci_dev->init_data.gates, st21nfcb_gates,
		sizeof(st21nfcb_gates));

		free_info:
		kfree_skb(skb_pipe_info);
		kfree_skb(skb_pipe_list);
		return r;
		}
		EXPORT_SYMBOL_GPL(st21nfcb_hci_load_session);

		static void st21nfcb_hci_admin_event_received(struct nci_dev *ndev,
		u8 event, struct sk_buff *skb)
		{
		struct st21nfcb_nci_info *info = nci_get_drvdata(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 nci_dev *ndev,
		u8 event,
		struct sk_buff *skb)
		{
		int r = 0;
		struct st21nfcb_nci_info *info = nci_get_drvdata(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 nci_dev *ndev,
		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;
		}

		void st21nfcb_hci_event_received(struct nci_dev *ndev, u8 pipe,
		u8 event, struct sk_buff *skb)
		{
		u8 gate = ndev->hci_dev->pipes[pipe].gate;
		u8 host = ndev->hci_dev->pipes[pipe].host;

		switch (gate) {
		case NCI_HCI_ADMIN_GATE:
		st21nfcb_hci_admin_event_received(ndev, event, skb);
		break;
		case ST21NFCB_APDU_READER_GATE:
		st21nfcb_hci_apdu_reader_event_received(ndev, event, skb);
		break;
		case ST21NFCB_CONNECTIVITY_GATE:
		st21nfcb_hci_connectivity_event_received(ndev, host, event,
		skb);
		break;
		}
		}
		EXPORT_SYMBOL_GPL(st21nfcb_hci_event_received);


		void st21nfcb_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
		struct sk_buff *skb)
		{
		struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
		u8 gate = ndev->hci_dev->pipes[pipe].gate;

		pr_debug("cmd: %x\n", cmd);

		switch (cmd) {
		case NCI_HCI_ANY_OPEN_PIPE:
		if (gate != ST21NFCB_APDU_READER_GATE &&
		ndev->hci_dev->pipes[pipe].host != ST21NFCB_UICC_HOST_ID)
		ndev->hci_dev->count_pipes++;

		if (ndev->hci_dev->count_pipes ==
		ndev->hci_dev->expected_pipes) {
		del_timer_sync(&info->se_info.se_active_timer);
		info->se_info.se_active = false;
		ndev->hci_dev->count_pipes = 0;
		complete(&info->se_info.req_completion);
		}
		break;
		}
		}
		EXPORT_SYMBOL_GPL(st21nfcb_hci_cmd_received);

		/*
		* 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);
		int r;
		struct sk_buff *sk_host_list;
		u8 host_id;

		switch (se_idx) {
		case ST21NFCB_UICC_HOST_ID:
		ndev->hci_dev->count_pipes = 0;
		ndev->hci_dev->expected_pipes = ST21NFCB_SE_COUNT_PIPE_UICC;
		break;
		case ST21NFCB_ESE_HOST_ID:
		ndev->hci_dev->count_pipes = 0;
		ndev->hci_dev->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);

		/* There might be some "collision" after receiving a HOT_PLUG event
		* This may cause the CLF to not answer to the next hci command.
		* There is no possible synchronization to prevent this.
		* Adding a small delay is the only way to solve the issue.
		*/
		usleep_range(3000, 5000);

		r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
		NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
		if (r != NCI_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)
		{
		int r;

		pr_debug("st21nfcb_nci_disable_se\n");

		if (se_idx == NFC_SE_EMBEDDED) {
		r = nci_hci_send_event(ndev, 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)
		{
		int r;

		pr_debug("st21nfcb_nci_enable_se\n");

		if (se_idx == ST21NFCB_HCI_HOST_ID_ESE) {
		r = nci_hci_send_event(ndev, 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 int st21nfcb_hci_network_init(struct nci_dev *ndev)
		{
		struct core_conn_create_dest_spec_params dest_params;
		struct nci_conn_info *conn_info;
		int r, dev_num;

		r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
		if (r != NCI_STATUS_OK)
		goto exit;

		dest_params.type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
		dest_params.length = sizeof(struct dest_spec_params);
		dest_params.value.id = ndev->hci_dev->conn_info->id;
		dest_params.value.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
		r = nci_core_conn_create(ndev, &dest_params);
		if (r != NCI_STATUS_OK)
		goto exit;

		conn_info = ndev->hci_dev->conn_info;
		if (!conn_info)
		goto exit;

		memcpy(ndev->hci_dev->init_data.gates, st21nfcb_gates,
		sizeof(st21nfcb_gates));

		/*
		* Session id must include the driver name + i2c bus addr
		* persistent info to discriminate 2 identical chips
		*/
		dev_num = find_first_zero_bit(dev_mask, ST21NFCB_NUM_DEVICES);
		if (dev_num >= ST21NFCB_NUM_DEVICES)
		return -ENODEV;

		scnprintf(ndev->hci_dev->init_data.session_id,
		sizeof(ndev->hci_dev->init_data.session_id),
		"%s%2x", "ST21BH", dev_num);

		r = nci_hci_dev_session_init(ndev);
		if (r != NCI_HCI_ANY_OK)
		goto exit;

		r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
		NCI_NFCEE_ENABLE);
		if (r != NCI_STATUS_OK)
		goto exit;

		return 0;

		exit:
		return r;
		}

		int st21nfcb_nci_discover_se(struct nci_dev *ndev)
		{
		u8 param[2];
		int r;
		int se_count = 0;

		pr_debug("st21nfcb_nci_discover_se\n");

		r = st21nfcb_hci_network_init(ndev);
		if (r != 0)
		return r;

		param[0] = ST21NFCB_UICC_HOST_ID;
		param[1] = ST21NFCB_HCI_HOST_ID_ESE;
		r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
		NCI_HCI_ADMIN_PARAM_WHITELIST,
		param, sizeof(param));
		if (r != NCI_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);

		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 nci_hci_send_event(ndev, 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;

		pr_debug("\n");

		info->se_info.bwi_active = false;

		if (!info->se_info.xch_error) {
		info->se_info.xch_error = true;
		nci_hci_send_event(info->ndlc->ndev, ST21NFCB_APDU_READER_GATE,
		ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0);
		} else {
		info->se_info.xch_error = false;
		nci_hci_send_event(info->ndlc->ndev, ST21NFCB_DEVICE_MGNT_GATE,
		ST21NFCB_EVT_SE_HARD_RESET, &param, 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;
		}
		EXPORT_SYMBOL(st21nfcb_se_deinit);

drivers/nfc/st21nfcb/st21nfcb_se.h

0 → 100644

+61 −0

Original line number	Diff line number	Diff line
		/*
		* 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_

		/*
		* 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;

		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);
		int st21nfcb_hci_load_session(struct nci_dev *ndev);
		void st21nfcb_hci_event_received(struct nci_dev *ndev, u8 pipe,
		u8 event, struct sk_buff *skb);
		void st21nfcb_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
		struct sk_buff *skb);


		#endif /* __LOCAL_ST21NFCB_NCI_H_ */

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