- 根目录:
- net
- nfc
- nci
- core.c
/*
* The NFC Controller Interface is the communication protocol between an
* NFC Controller (NFCC) and a Device Host (DH).
*
* Copyright (C) 2011 Texas Instruments, Inc.
*
* Written by Ilan Elias <ilane@ti.com>
*
* Acknowledgements:
* This file is based on hci_core.c, which was written
* by Maxim Krasnyansky.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms 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/>.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/module.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 "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>
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);
/* ---- 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);
}
}
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, unsigned long opt),
unsigned long opt, __u32 timeout)
{
int rc = 0;
long completion_rc;
ndev->req_status = NCI_REQ_PEND;
init_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;
}
static inline int nci_request(struct nci_dev *ndev,
void (*req)(struct nci_dev *ndev,
unsigned long opt),
unsigned long opt, __u32 timeout)
{
int rc;
if (!test_bit(NCI_UP, &ndev->flags))
return -ENETDOWN;
/* Serialize all requests */
mutex_lock(&ndev->req_lock);
rc = __nci_request(ndev, req, opt, timeout);
mutex_unlock(&ndev->req_lock);
return rc;
}
static void nci_reset_req(struct nci_dev *ndev, unsigned long 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, unsigned long opt)
{
nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
}
static void nci_init_complete_req(struct nci_dev *ndev, unsigned long 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;
__u8 *val;
};
static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
{
struct nci_set_config_param *param = (struct nci_set_config_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);
}
static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
{
struct nci_rf_disc_cmd cmd;
__u32 protocols = opt;
cmd.num_disc_configs = 0;
if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
(protocols & NFC_PROTO_JEWEL_MASK ||
protocols & NFC_PROTO_MIFARE_MASK ||
protocols & NFC_PROTO_ISO14443_MASK ||
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) &&
(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) &&
(protocols & NFC_PROTO_FELICA_MASK ||
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++;
}
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, unsigned long opt)
{
struct nci_rf_discover_select_param *param =
(struct nci_rf_discover_select_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, unsigned long opt)
{
struct nci_rf_deactivate_cmd cmd;
cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
sizeof(struct nci_rf_deactivate_cmd), &cmd);
}
static int nci_open_device(struct nci_dev *ndev)
{
int rc = 0;
mutex_lock(&ndev->req_lock);
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);
rc = __nci_request(ndev, nci_reset_req, 0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
if (ndev->ops->setup)
ndev->ops->setup(ndev);
if (!rc) {
rc = __nci_request(ndev, nci_init_req, 0,
msecs_to_jiffies(NCI_INIT_TIMEOUT));
}
if (!rc) {
rc = __nci_request(ndev, nci_init_complete_req, 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 = 0;
}
done:
mutex_unlock(&ndev->req_lock);
return rc;
}
static int nci_close_device(struct nci_dev *ndev)
{
nci_req_cancel(ndev, ENODEV);
mutex_lock(&ndev->req_lock);
if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
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, 0,
msecs_to_jiffies(NCI_RESET_TIMEOUT));
clear_bit(NCI_INIT, &ndev->flags);
del_timer_sync(&ndev->cmd_timer);
/* Flush cmd wq */
flush_workqueue(ndev->cmd_wq);
/* After this point our queues are empty
* and no works are scheduled. */
ndev->ops->close(ndev);
/* Clear flags */
ndev->flags = 0;
mutex_unlock(&ndev->req_lock);
return 0;
}
/* NCI command timer function */
static void nci_cmd_timer(unsigned long arg)
{
struct nci_dev *ndev = (void *) arg;
atomic_set(&ndev->cmd_cnt, 1);
queue_work(ndev->cmd_wq, &ndev->cmd_work);
}
/* NCI data exchange timer function */
static void nci_data_timer(unsigned long arg)
{
struct nci_dev *ndev = (void *) arg;
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, __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, (unsigned long)¶m,
msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
}
EXPORT_SYMBOL(nci_set_config);
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;
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;
return nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
}
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);
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, 0,
msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
if (rc)
return -EBUSY;
}
if (im_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;
}
}
rc = nci_request(ndev, nci_rf_discover_req, im_protocols,
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, 0,
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;
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 (!(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,
(unsigned long)¶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)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
pr_debug("entry\n");
if (!ndev->target_active_prot) {
pr_err("unable to deactivate target, no active target\n");
return;
}
ndev->target_active_prot = 0;
if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
nci_request(ndev, nci_rf_deactivate_req, 0,
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)
{
pr_debug("entry\n");
nci_deactivate_target(nfc_dev, NULL);
return 0;
}
static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
struct sk_buff *skb,
data_exchange_cb_t cb, void *cb_context)
{
struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
int rc;
pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
if (!ndev->target_active_prot) {
pr_err("unable to exchange data, no active target\n");
return -EINVAL;
}
if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
return -EBUSY;
/* store cb and context to be used on receiving data */
ndev->data_exchange_cb = cb;
ndev->data_exchange_cb_context = cb_context;
rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
if (rc)
clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
return rc;
}
static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
{
return 0;
}
static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
{
return 0;
}
static int nci_discover_se(struct nfc_dev *nfc_dev)
{
return 0;
}
static struct nfc_ops nci_nfc_ops = {
.dev_up = nci_dev_up,
.dev_down = nci_dev_down,
.start_poll = nci_start_poll,
.stop_poll = nci_stop_poll,
.dep_link_up = nci_dep_link_up,
.dep_link_down = nci_dep_link_down,
.activate_target = nci_activate_target,
.deactivate_target = nci_deactivate_target,
.im_transceive = nci_transceive,
.enable_se = nci_enable_se,
.disable_se = nci_disable_se,
.discover_se = nci_discover_se,
};
/* ---- Interface to NCI drivers ---- */
/**
* nci_allocate_device - allocate a new nci device
*
* @ops: device operations
* @supported_protocols: NFC protocols supported by the device
*/
struct nci_dev *nci_allocate_device(struct nci_ops *ops,
__u32 supported_protocols,
int tx_headroom, int tx_tailroom)
{
struct nci_dev *ndev;
pr_debug("supported_protocols 0x%x\n", supported_protocols);
if (!ops->open || !ops->close || !ops->send)
return NULL;
if (!supported_protocols)
return NULL;
ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
if (!ndev)
return NULL;
ndev->ops = ops;
ndev->tx_headroom = tx_headroom;
ndev->tx_tailroom = tx_tailroom;
ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
supported_protocols,
tx_headroom + NCI_DATA_HDR_SIZE,
tx_tailroom);
if (!ndev->nfc_dev)
goto free_exit;
nfc_set_drvdata(ndev->nfc_dev, ndev);
return ndev;
free_exit:
kfree(ndev);
return NULL;
}
EXPORT_SYMBOL(nci_allocate_device);
/**
* nci_free_device - deallocate nci device
*
* @ndev: The nci device to deallocate
*/
void nci_free_device(struct nci_dev *ndev)
{
nfc_free_device(ndev->nfc_dev);
kfree(ndev);
}
EXPORT_SYMBOL(nci_free_device);
/**
* nci_register_device - register a nci device in the nfc subsystem
*
* @dev: The nci device to register
*/
int nci_register_device(struct nci_dev *ndev)
{
int rc;
struct device *dev = &ndev->nfc_dev->dev;
char name[32];
rc = nfc_register_device(ndev->nfc_dev);
if (rc)
goto exit;
ndev->flags = 0;
INIT_WORK(&ndev->cmd_work, nci_cmd_work);
snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
ndev->cmd_wq = create_singlethread_workqueue(name);
if (!ndev->cmd_wq) {
rc = -ENOMEM;
goto unreg_exit;
}
INIT_WORK(&ndev->rx_work, nci_rx_work);
snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
ndev->rx_wq = create_singlethread_workqueue(name);
if (!ndev->rx_wq) {
rc = -ENOMEM;
goto destroy_cmd_wq_exit;
}
INIT_WORK(&ndev->tx_work, nci_tx_work);
snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
ndev->tx_wq = create_singlethread_workqueue(name);
if (!ndev->tx_wq) {
rc = -ENOMEM;
goto destroy_rx_wq_exit;
}
skb_queue_head_init(&ndev->cmd_q);
skb_queue_head_init(&ndev->rx_q);
skb_queue_head_init(&ndev->tx_q);
setup_timer(&ndev->cmd_timer, nci_cmd_timer,
(unsigned long) ndev);
setup_timer(&ndev->data_timer, nci_data_timer,
(unsigned long) ndev);
mutex_init(&ndev->req_lock);
goto exit;
destroy_rx_wq_exit:
destroy_workqueue(ndev->rx_wq);
destroy_cmd_wq_exit:
destroy_workqueue(ndev->cmd_wq);
unreg_exit:
nfc_unregister_device(ndev->nfc_dev);
exit:
return rc;
}
EXPORT_SYMBOL(nci_register_device);
/**
* nci_unregister_device - unregister a nci device in the nfc subsystem
*
* @dev: The nci device to unregister
*/
void nci_unregister_device(struct nci_dev *ndev)
{
nci_close_device(ndev);
destroy_workqueue(ndev->cmd_wq);
destroy_workqueue(ndev->rx_wq);
destroy_workqueue(ndev->tx_wq);
nfc_unregister_device(ndev->nfc_dev);
}
EXPORT_SYMBOL(nci_unregister_device);
/**
* nci_recv_frame - receive frame from NCI drivers
*
* @ndev: The nci device
* @skb: The sk_buff to receive
*/
int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
{
pr_debug("len %d\n", skb->len);
if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
!test_bit(NCI_INIT, &ndev->flags))) {
kfree_skb(skb);
return -ENXIO;
}
/* Queue frame for rx worker thread */
skb_queue_tail(&ndev->rx_q, skb);
queue_work(ndev->rx_wq, &ndev->rx_work);
return 0;
}
EXPORT_SYMBOL(nci_recv_frame);
static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
{
pr_debug("len %d\n", skb->len);
if (!ndev) {
kfree_skb(skb);
return -ENODEV;
}
/* Get rid of skb owner, prior to sending to the driver. */
skb_orphan(skb);
return ndev->ops->send(ndev, skb);
}
/* Send NCI command */
int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
{
struct nci_ctrl_hdr *hdr;
struct sk_buff *skb;
pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
if (!skb) {
pr_err("no memory for command\n");
return -ENOMEM;
}
hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
hdr->gid = nci_opcode_gid(opcode);
hdr->oid = nci_opcode_oid(opcode);
hdr->plen = plen;
nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
if (plen)
memcpy(skb_put(skb, plen), payload, plen);
skb_queue_tail(&ndev->cmd_q, skb);
queue_work(ndev->cmd_wq, &ndev->cmd_work);
return 0;
}
/* ---- NCI TX Data worker thread ---- */
static void nci_tx_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
struct sk_buff *skb;
pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
/* Send queued tx data */
while (atomic_read(&ndev->credits_cnt)) {
skb = skb_dequeue(&ndev->tx_q);
if (!skb)
return;
/* Check if data flow control is used */
if (atomic_read(&ndev->credits_cnt) !=
NCI_DATA_FLOW_CONTROL_NOT_USED)
atomic_dec(&ndev->credits_cnt);
pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
nci_pbf(skb->data),
nci_conn_id(skb->data),
nci_plen(skb->data));
nci_send_frame(ndev, skb);
mod_timer(&ndev->data_timer,
jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
}
}
/* ----- NCI RX worker thread (data & control) ----- */
static void nci_rx_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
struct sk_buff *skb;
while ((skb = skb_dequeue(&ndev->rx_q))) {
/* Process frame */
switch (nci_mt(skb->data)) {
case NCI_MT_RSP_PKT:
nci_rsp_packet(ndev, skb);
break;
case NCI_MT_NTF_PKT:
nci_ntf_packet(ndev, skb);
break;
case NCI_MT_DATA_PKT:
nci_rx_data_packet(ndev, skb);
break;
default:
pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
kfree_skb(skb);
break;
}
}
/* check if a data exchange timout has occurred */
if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
/* complete the data exchange transaction, if exists */
if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
}
}
/* ----- NCI TX CMD worker thread ----- */
static void nci_cmd_work(struct work_struct *work)
{
struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
struct sk_buff *skb;
pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
/* Send queued command */
if (atomic_read(&ndev->cmd_cnt)) {
skb = skb_dequeue(&ndev->cmd_q);
if (!skb)
return;
atomic_dec(&ndev->cmd_cnt);
pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
nci_pbf(skb->data),
nci_opcode_gid(nci_opcode(skb->data)),
nci_opcode_oid(nci_opcode(skb->data)),
nci_plen(skb->data));
nci_send_frame(ndev, skb);
mod_timer(&ndev->cmd_timer,
jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
}
}
MODULE_LICENSE("GPL");