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core.c
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core.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* The NFC Controller Interface is the communication protocol between an
* NFC Controller (NFCC) and a Device Host (DH).
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2014 Marvell International Ltd.
*
* Written by Ilan Elias <ilane@ti.com>
*
* Acknowledgements:
* This file is based on hci_core.c, which was written
* by Maxim Krasnyansky.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>
#include <linux/kcov.h>
#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
struct core_conn_create_data {
int length;
struct nci_core_conn_create_cmd *cmd;
};
static void nci_cmd_work(struct work_struct *work);
static void nci_rx_work(struct work_struct *work);
static void nci_tx_work(struct work_struct *work);
struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
int conn_id)
{
struct nci_conn_info *conn_info;
list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
if (conn_info->conn_id == conn_id)
return conn_info;
}
return NULL;
}
int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
const struct dest_spec_params *params)
{
const struct nci_conn_info *conn_info;
list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
if (conn_info->dest_type == dest_type) {
if (!params)
return conn_info->conn_id;
if (params->id == conn_info->dest_params->id &&
params->protocol == conn_info->dest_params->protocol)
return conn_info->conn_id;
}
}
return -EINVAL;
}
EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
/* ---- NCI requests ---- */
void nci_req_complete(struct nci_dev *ndev, int result)
{
if (ndev->req_status == NCI_REQ_PEND) {
ndev->req_result = result;
ndev->req_status = NCI_REQ_DONE;
complete(&ndev->req_completion);
}
}
EXPORT_SYMBOL(nci_req_complete);
static void nci_req_cancel(struct nci_dev *ndev, int err)
{
if (ndev->req_status == NCI_REQ_PEND) {
ndev->req_result = err;
ndev->req_status = NCI_REQ_CANCELED;
complete(&ndev->req_completion);
}
}
/* Execute request and wait for completion. */
static int __nci_request(struct nci_dev *ndev,
void (*req)(struct nci_dev *ndev, const void *opt),
const void *opt, __u32 timeout)
{
int rc = 0;
long completion_rc;
ndev->req_status = NCI_REQ_PEND;
reinit_completion(&ndev->req_completion);
req(ndev, opt);
completion_rc =
wait_for_completion_interruptible_timeout(&ndev->req_completion,
timeout);
pr_debug("wait_for_completion return %ld\n", completion_rc);
if (completion_rc > 0) {
switch (ndev->req_status) {
case NCI_REQ_DONE:
rc = nci_to_errno(ndev->req_result);
break;
case NCI_REQ_CANCELED:
rc = -ndev->req_result;
break;
default:
rc = -ETIMEDOUT;
break;
}
} else {
pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
completion_rc);
rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
}
ndev->req_status = ndev->req_result = 0;
return rc;
}
inline int nci_request(struct nci_dev *ndev,
void (*req)(struct nci_dev *ndev,
const void *opt),
const void *opt, __u32 timeout)
{
int rc;
/* Serialize all requests */
mutex_lock(&ndev->req_lock);
/* check the state after obtaing the lock against any races
* from nci_close_device when the device gets removed.
*/
if (test_bit(NCI_UP, &ndev->flags))
rc = __nci_request(ndev, req, opt, timeout);
else
rc = -ENETDOWN;
mutex_unlock(&ndev->req_lock);
return rc;
}
static void nci_reset_req(struct nci_dev *ndev, const void *opt)
{
struct nci_core_reset_cmd cmd;
cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
}
static void nci_init_req(struct nci_dev *ndev, const void *opt)
{
u8 plen = 0;
if (opt)
plen = sizeof(struct nci_core_init_v2_cmd);
nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, opt);
}
static void nci_init_complete_req(struct nci_dev *ndev, const void *opt)
{
struct nci_rf_disc_map_cmd cmd;
struct disc_map_config *cfg = cmd.mapping_configs;
__u8 *num = &cmd.num_mapping_configs;
int i;
/* set rf mapping configurations */
*num = 0;
/* by default mapping is set to NCI_RF_INTERFACE_FRAME */
for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
if (ndev->supported_rf_interfaces[i] ==
NCI_RF_INTERFACE_ISO_DEP) {
cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
NCI_DISC_MAP_MODE_LISTEN;
cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
(*num)++;
} else if (ndev->supported_rf_interfaces[i] ==
NCI_RF_INTERFACE_NFC_DEP) {
cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
NCI_DISC_MAP_MODE_LISTEN;
cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
(*num)++;
}
if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
break;
}
nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
(1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
}
struct nci_set_config_param {
__u8 id;
size_t len;
const __u8 *val;
};
static void nci_set_config_req(struct nci_dev *ndev, const void *opt)
{
const struct nci_set_config_param *param = opt;
struct nci_core_set_config_cmd cmd;
BUG_ON(param->len > NCI_MAX_PARAM_LEN);
cmd.num_params = 1;
cmd.param.id = param->id;
cmd.param.len = param->len;
memcpy(cmd.param.val, param->val, param->len);
nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
}
struct nci_rf_discover_param {
__u32 im_protocols;
__u32 tm_protocols;
};
static void nci_rf_discover_req(struct nci_dev *ndev, const void *opt)
{
const struct nci_rf_discover_param *param = opt;
struct nci_rf_disc_cmd cmd;
cmd.num_disc_configs = 0;
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(param->im_protocols & NFC_PROTO_JEWEL_MASK ||
param->im_protocols & NFC_PROTO_MIFARE_MASK ||
param->im_protocols & NFC_PROTO_ISO14443_MASK ||
param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
NCI_NFC_A_PASSIVE_POLL_MODE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
NCI_NFC_B_PASSIVE_POLL_MODE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(param->im_protocols & NFC_PROTO_FELICA_MASK ||
param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
NCI_NFC_F_PASSIVE_POLL_MODE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
NCI_NFC_V_PASSIVE_POLL_MODE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
(param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
NCI_NFC_A_PASSIVE_LISTEN_MODE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
NCI_NFC_F_PASSIVE_LISTEN_MODE;
cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
cmd.num_disc_configs++;
}
nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
(1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
&cmd);
}
struct nci_rf_discover_select_param {
__u8 rf_discovery_id;
__u8 rf_protocol;
};
static void nci_rf_discover_select_req(struct nci_dev *ndev, const void *opt)
{
const struct nci_rf_discover_select_param *param = opt;
struct nci_rf_discover_select_cmd cmd;
cmd.rf_discovery_id = param->rf_discovery_id;
cmd.rf_protocol = param->rf_protocol;
switch (cmd.rf_protocol) {
case NCI_RF_PROTOCOL_ISO_DEP:
cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
break;
case NCI_RF_PROTOCOL_NFC_DEP:
cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
break;
default:
cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
break;
}
nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
sizeof(struct nci_rf_discover_select_cmd), &cmd);
}
static void nci_rf_deactivate_req(struct nci_dev *ndev, const void *opt)
{
struct nci_rf_deactivate_cmd cmd;
cmd.type = (unsigned long)opt;
nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
sizeof(struct nci_rf_deactivate_cmd), &cmd);
}
struct nci_cmd_param {
__u16 opcode;
size_t len;
const __u8 *payload;
};
static void nci_generic_req(struct nci_dev *ndev, const void *opt)
{
const struct nci_cmd_param *param = opt;
nci_send_cmd(ndev, param->opcode, param->len, param->payload);
}
int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, const __u8 *payload)
{
struct nci_cmd_param param;
param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
param.len = len;
param.payload = payload;
return __nci_request(ndev, nci_generic_req, ¶m,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_prop_cmd);
int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
const __u8 *payload)
{
struct nci_cmd_param param;
param.opcode = opcode;
param.len = len;
param.payload = payload;
return __nci_request(ndev, nci_generic_req, ¶m,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_core_cmd);
int nci_core_reset(struct nci_dev *ndev)
{
return __nci_request(ndev, nci_reset_req, (void *)0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
}
EXPORT_SYMBOL(nci_core_reset);
int nci_core_init(struct nci_dev *ndev)
{
return __nci_request(ndev, nci_init_req, (void *)0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
EXPORT_SYMBOL(nci_core_init);
struct nci_loopback_data {
u8 conn_id;
struct sk_buff *data;
};
static void nci_send_data_req(struct nci_dev *ndev, const void *opt)
{
const struct nci_loopback_data *data = opt;
nci_send_data(ndev, data->conn_id, data->data);
}
static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
{
struct nci_dev *ndev = (struct nci_dev *)context;
struct nci_conn_info *conn_info;
conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
if (!conn_info) {
nci_req_complete(ndev, NCI_STATUS_REJECTED);
return;
}
conn_info->rx_skb = skb;
nci_req_complete(ndev, NCI_STATUS_OK);
}
int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
struct sk_buff **resp)
{
int r;
struct nci_loopback_data loopback_data;
struct nci_conn_info *conn_info;
struct sk_buff *skb;
int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
NCI_DESTINATION_NFCC_LOOPBACK, NULL);
if (conn_id < 0) {
r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
0, 0, NULL);
if (r != NCI_STATUS_OK)
return r;
conn_id = nci_get_conn_info_by_dest_type_params(ndev,
NCI_DESTINATION_NFCC_LOOPBACK,
NULL);
}
conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
if (!conn_info)
return -EPROTO;
/* store cb and context to be used on receiving data */
conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
conn_info->data_exchange_cb_context = ndev;
skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, NCI_DATA_HDR_SIZE);
skb_put_data(skb, data, data_len);
loopback_data.conn_id = conn_id;
loopback_data.data = skb;
ndev->cur_conn_id = conn_id;
r = nci_request(ndev, nci_send_data_req, &loopback_data,
msecs_to_jiffies(NCI_DATA_TIMEOUT));
if (r == NCI_STATUS_OK && resp)
*resp = conn_info->rx_skb;
return r;
}
EXPORT_SYMBOL(nci_nfcc_loopback);
static int nci_open_device(struct nci_dev *ndev)
{
int rc = 0;
mutex_lock(&ndev->req_lock);
if (test_bit(NCI_UNREG, &ndev->flags)) {
rc = -ENODEV;
goto done;
}
if (test_bit(NCI_UP, &ndev->flags)) {
rc = -EALREADY;
goto done;
}
if (ndev->ops->open(ndev)) {
rc = -EIO;
goto done;
}
atomic_set(&ndev->cmd_cnt, 1);
set_bit(NCI_INIT, &ndev->flags);
if (ndev->ops->init)
rc = ndev->ops->init(ndev);
if (!rc) {
rc = __nci_request(ndev, nci_reset_req, (void *)0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
}
if (!rc && ndev->ops->setup) {
rc = ndev->ops->setup(ndev);
}
if (!rc) {
struct nci_core_init_v2_cmd nci_init_v2_cmd = {
.feature1 = NCI_FEATURE_DISABLE,
.feature2 = NCI_FEATURE_DISABLE
};
const void *opt = NULL;
if (ndev->nci_ver & NCI_VER_2_MASK)
opt = &nci_init_v2_cmd;
rc = __nci_request(ndev, nci_init_req, opt,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
if (!rc && ndev->ops->post_setup)
rc = ndev->ops->post_setup(ndev);
if (!rc) {
rc = __nci_request(ndev, nci_init_complete_req, (void *)0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
clear_bit(NCI_INIT, &ndev->flags);
if (!rc) {
set_bit(NCI_UP, &ndev->flags);
nci_clear_target_list(ndev);
atomic_set(&ndev->state, NCI_IDLE);
} else {
/* Init failed, cleanup */
skb_queue_purge(&ndev->cmd_q);
skb_queue_purge(&ndev->rx_q);
skb_queue_purge(&ndev->tx_q);
ndev->ops->close(ndev);
ndev->flags &= BIT(NCI_UNREG);
}
done:
mutex_unlock(&ndev->req_lock);
return rc;
}
static int nci_close_device(struct nci_dev *ndev)
{
nci_req_cancel(ndev, ENODEV);
/* This mutex needs to be held as a barrier for
* caller nci_unregister_device
*/
mutex_lock(&ndev->req_lock);
if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
/* Need to flush the cmd wq in case
* there is a queued/running cmd_work
*/
flush_workqueue(ndev->cmd_wq);
del_timer_sync(&ndev->cmd_timer);
del_timer_sync(&ndev->data_timer);
mutex_unlock(&ndev->req_lock);
return 0;
}
/* Drop RX and TX queues */
skb_queue_purge(&ndev->rx_q);
skb_queue_purge(&ndev->tx_q);
/* Flush RX and TX wq */
flush_workqueue(ndev->rx_wq);
flush_workqueue(ndev->tx_wq);
/* Reset device */
skb_queue_purge(&ndev->cmd_q);
atomic_set(&ndev->cmd_cnt, 1);
set_bit(NCI_INIT, &ndev->flags);
__nci_request(ndev, nci_reset_req, (void *)0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
/* After this point our queues are empty
* and no works are scheduled.
*/
ndev->ops->close(ndev);
clear_bit(NCI_INIT, &ndev->flags);
/* Flush cmd wq */
flush_workqueue(ndev->cmd_wq);
del_timer_sync(&ndev->cmd_timer);
/* Clear flags except NCI_UNREG */
ndev->flags &= BIT(NCI_UNREG);
mutex_unlock(&ndev->req_lock);
return 0;
}
/* NCI command timer function */
static void nci_cmd_timer(struct timer_list *t)
{
struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
atomic_set(&ndev->cmd_cnt, 1);
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}
/* NCI data exchange timer function */
static void nci_data_timer(struct timer_list *t)
{
struct nci_dev *ndev = from_timer(ndev, t, data_timer);
set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
queue_work(ndev->rx_wq, &ndev->rx_work);
}
static int nci_dev_up(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
return nci_open_device(ndev);
}
static int nci_dev_down(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
return nci_close_device(ndev);
}
int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val)
{
struct nci_set_config_param param;
if (!val || !len)
return 0;
param.id = id;
param.len = len;
param.val = val;
return __nci_request(ndev, nci_set_config_req, ¶m,
msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
}
EXPORT_SYMBOL(nci_set_config);
static void nci_nfcee_discover_req(struct nci_dev *ndev, const void *opt)
{
struct nci_nfcee_discover_cmd cmd;
__u8 action = (unsigned long)opt;
cmd.discovery_action = action;
nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
}
int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
{
unsigned long opt = action;
return __nci_request(ndev, nci_nfcee_discover_req, (void *)opt,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_nfcee_discover);
static void nci_nfcee_mode_set_req(struct nci_dev *ndev, const void *opt)
{
const struct nci_nfcee_mode_set_cmd *cmd = opt;
nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
sizeof(struct nci_nfcee_mode_set_cmd), cmd);
}
int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
{
struct nci_nfcee_mode_set_cmd cmd;
cmd.nfcee_id = nfcee_id;
cmd.nfcee_mode = nfcee_mode;
return __nci_request(ndev, nci_nfcee_mode_set_req, &cmd,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_nfcee_mode_set);
static void nci_core_conn_create_req(struct nci_dev *ndev, const void *opt)
{
const struct core_conn_create_data *data = opt;
nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
}
int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
u8 number_destination_params,
size_t params_len,
const struct core_conn_create_dest_spec_params *params)
{
int r;
struct nci_core_conn_create_cmd *cmd;
struct core_conn_create_data data;
data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
cmd = kzalloc(data.length, GFP_KERNEL);
if (!cmd)
return -ENOMEM;
cmd->destination_type = destination_type;
cmd->number_destination_params = number_destination_params;
data.cmd = cmd;
if (params) {
memcpy(cmd->params, params, params_len);
if (params->length > 0)
memcpy(&ndev->cur_params,
¶ms->value[DEST_SPEC_PARAMS_ID_INDEX],
sizeof(struct dest_spec_params));
else
ndev->cur_params.id = 0;
} else {
ndev->cur_params.id = 0;
}
ndev->cur_dest_type = destination_type;
r = __nci_request(ndev, nci_core_conn_create_req, &data,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
kfree(cmd);
return r;
}
EXPORT_SYMBOL(nci_core_conn_create);
static void nci_core_conn_close_req(struct nci_dev *ndev, const void *opt)
{
__u8 conn_id = (unsigned long)opt;
nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
}
int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
{
unsigned long opt = conn_id;
ndev->cur_conn_id = conn_id;
return __nci_request(ndev, nci_core_conn_close_req, (void *)opt,
msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
EXPORT_SYMBOL(nci_core_conn_close);
static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
struct nci_set_config_param param;
int rc;
param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len);
if ((param.val == NULL) || (param.len == 0))
return 0;
if (param.len > NFC_MAX_GT_LEN)
return -EINVAL;
param.id = NCI_PN_ATR_REQ_GEN_BYTES;
rc = nci_request(ndev, nci_set_config_req, ¶m,
msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
if (rc)
return rc;
param.id = NCI_LN_ATR_RES_GEN_BYTES;
return nci_request(ndev, nci_set_config_req, ¶m,
msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
}
static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
int rc;
__u8 val;
val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
if (rc)
return rc;
val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
if (rc)
return rc;
val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
}
static int nci_start_poll(struct nfc_dev *nfc_dev,
__u32 im_protocols, __u32 tm_protocols)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
struct nci_rf_discover_param param;
int rc;
if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
(atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
pr_err("unable to start poll, since poll is already active\n");
return -EBUSY;
}
if (ndev->target_active_prot) {
pr_err("there is an active target\n");
return -EBUSY;
}
if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
(atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
pr_debug("target active or w4 select, implicitly deactivate\n");
rc = nci_request(ndev, nci_rf_deactivate_req,
(void *)NCI_DEACTIVATE_TYPE_IDLE_MODE,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
if (rc)
return -EBUSY;
}
if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
rc = nci_set_local_general_bytes(nfc_dev);
if (rc) {
pr_err("failed to set local general bytes\n");
return rc;
}
}
if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
rc = nci_set_listen_parameters(nfc_dev);
if (rc)
pr_err("failed to set listen parameters\n");
}
param.im_protocols = im_protocols;
param.tm_protocols = tm_protocols;
rc = nci_request(ndev, nci_rf_discover_req, ¶m,
msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
if (!rc)
ndev->poll_prots = im_protocols;
return rc;
}
static void nci_stop_poll(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
(atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
pr_err("unable to stop poll, since poll is not active\n");
return;
}
nci_request(ndev, nci_rf_deactivate_req,
(void *)NCI_DEACTIVATE_TYPE_IDLE_MODE,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
}
static int nci_activate_target(struct nfc_dev *nfc_dev,
struct nfc_target *target, __u32 protocol)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
struct nci_rf_discover_select_param param;
const struct nfc_target *nci_target = NULL;
int i;
int rc = 0;
pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
(atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
pr_err("there is no available target to activate\n");
return -EINVAL;
}
if (ndev->target_active_prot) {
pr_err("there is already an active target\n");
return -EBUSY;
}
for (i = 0; i < ndev->n_targets; i++) {
if (ndev->targets[i].idx == target->idx) {
nci_target = &ndev->targets[i];
break;
}
}
if (!nci_target) {
pr_err("unable to find the selected target\n");
return -EINVAL;
}
if (protocol >= NFC_PROTO_MAX) {
pr_err("the requested nfc protocol is invalid\n");
return -EINVAL;
}
if (!(nci_target->supported_protocols & (1 << protocol))) {
pr_err("target does not support the requested protocol 0x%x\n",
protocol);
return -EINVAL;
}
if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
param.rf_discovery_id = nci_target->logical_idx;
if (protocol == NFC_PROTO_JEWEL)
param.rf_protocol = NCI_RF_PROTOCOL_T1T;
else if (protocol == NFC_PROTO_MIFARE)
param.rf_protocol = NCI_RF_PROTOCOL_T2T;
else if (protocol == NFC_PROTO_FELICA)
param.rf_protocol = NCI_RF_PROTOCOL_T3T;
else if (protocol == NFC_PROTO_ISO14443 ||
protocol == NFC_PROTO_ISO14443_B)
param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
else
param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
rc = nci_request(ndev, nci_rf_discover_select_req, ¶m,
msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
}
if (!rc)
ndev->target_active_prot = protocol;
return rc;
}
static void nci_deactivate_target(struct nfc_dev *nfc_dev,
struct nfc_target *target,
__u8 mode)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
unsigned long nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
if (!ndev->target_active_prot) {
pr_err("unable to deactivate target, no active target\n");
return;
}
ndev->target_active_prot = 0;
switch (mode) {
case NFC_TARGET_MODE_SLEEP:
nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
break;
}
if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
nci_request(ndev, nci_rf_deactivate_req, (void *)nci_mode,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
}
}
static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
__u8 comm_mode, __u8 *gb, size_t gb_len)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
int rc;
pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
if (rc)
return rc;
rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
ndev->remote_gb_len);
if (!rc)
rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
NFC_RF_INITIATOR);
return rc;
}
static int nci_dep_link_down(struct nfc_dev *nfc_dev)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
int rc;
if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {